obj-$(CONFIG_TAP) += tap.o
obj-$(CONFIG_VETH) += veth.o
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
-obj-$(CONFIG_VXLAN) += vxlan.o
+obj-$(CONFIG_VXLAN) += vxlan/
obj-$(CONFIG_GENEVE) += geneve.o
obj-$(CONFIG_BAREUDP) += bareudp.o
obj-$(CONFIG_GTP) += gtp.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * VXLAN: Virtual eXtensible Local Area Network
- *
- * Copyright (c) 2012-2013 Vyatta Inc.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-#include <linux/udp.h>
-#include <linux/igmp.h>
-#include <linux/if_ether.h>
-#include <linux/ethtool.h>
-#include <net/arp.h>
-#include <net/ndisc.h>
-#include <net/gro.h>
-#include <net/ipv6_stubs.h>
-#include <net/ip.h>
-#include <net/icmp.h>
-#include <net/rtnetlink.h>
-#include <net/inet_ecn.h>
-#include <net/net_namespace.h>
-#include <net/netns/generic.h>
-#include <net/tun_proto.h>
-#include <net/vxlan.h>
-#include <net/nexthop.h>
-
-#if IS_ENABLED(CONFIG_IPV6)
-#include <net/ip6_tunnel.h>
-#include <net/ip6_checksum.h>
-#endif
-
-#define VXLAN_VERSION "0.1"
-
-#define PORT_HASH_BITS 8
-#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
-#define FDB_AGE_DEFAULT 300 /* 5 min */
-#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
-
-/* UDP port for VXLAN traffic.
- * The IANA assigned port is 4789, but the Linux default is 8472
- * for compatibility with early adopters.
- */
-static unsigned short vxlan_port __read_mostly = 8472;
-module_param_named(udp_port, vxlan_port, ushort, 0444);
-MODULE_PARM_DESC(udp_port, "Destination UDP port");
-
-static bool log_ecn_error = true;
-module_param(log_ecn_error, bool, 0644);
-MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
-
-static unsigned int vxlan_net_id;
-static struct rtnl_link_ops vxlan_link_ops;
-
-static const u8 all_zeros_mac[ETH_ALEN + 2];
-
-static int vxlan_sock_add(struct vxlan_dev *vxlan);
-
-static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
-
-/* per-network namespace private data for this module */
-struct vxlan_net {
- struct list_head vxlan_list;
- struct hlist_head sock_list[PORT_HASH_SIZE];
- spinlock_t sock_lock;
- struct notifier_block nexthop_notifier_block;
-};
-
-/* Forwarding table entry */
-struct vxlan_fdb {
- struct hlist_node hlist; /* linked list of entries */
- struct rcu_head rcu;
- unsigned long updated; /* jiffies */
- unsigned long used;
- struct list_head remotes;
- u8 eth_addr[ETH_ALEN];
- u16 state; /* see ndm_state */
- __be32 vni;
- u16 flags; /* see ndm_flags and below */
- struct list_head nh_list;
- struct nexthop __rcu *nh;
- struct vxlan_dev __rcu *vdev;
-};
-
-#define NTF_VXLAN_ADDED_BY_USER 0x100
-
-/* salt for hash table */
-static u32 vxlan_salt __read_mostly;
-
-static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
-{
- return vs->flags & VXLAN_F_COLLECT_METADATA ||
- ip_tunnel_collect_metadata();
-}
-
-#if IS_ENABLED(CONFIG_IPV6)
-static inline
-bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
-{
- if (a->sa.sa_family != b->sa.sa_family)
- return false;
- if (a->sa.sa_family == AF_INET6)
- return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
- else
- return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
-}
-
-static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
-{
- if (nla_len(nla) >= sizeof(struct in6_addr)) {
- ip->sin6.sin6_addr = nla_get_in6_addr(nla);
- ip->sa.sa_family = AF_INET6;
- return 0;
- } else if (nla_len(nla) >= sizeof(__be32)) {
- ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
- ip->sa.sa_family = AF_INET;
- return 0;
- } else {
- return -EAFNOSUPPORT;
- }
-}
-
-static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
- const union vxlan_addr *ip)
-{
- if (ip->sa.sa_family == AF_INET6)
- return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
- else
- return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
-}
-
-#else /* !CONFIG_IPV6 */
-
-static inline
-bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
-{
- return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
-}
-
-static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
-{
- if (nla_len(nla) >= sizeof(struct in6_addr)) {
- return -EAFNOSUPPORT;
- } else if (nla_len(nla) >= sizeof(__be32)) {
- ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
- ip->sa.sa_family = AF_INET;
- return 0;
- } else {
- return -EAFNOSUPPORT;
- }
-}
-
-static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
- const union vxlan_addr *ip)
-{
- return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
-}
-#endif
-
-/* Virtual Network hash table head */
-static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
-{
- return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
-}
-
-/* Socket hash table head */
-static inline struct hlist_head *vs_head(struct net *net, __be16 port)
-{
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
-
- return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
-}
-
-/* First remote destination for a forwarding entry.
- * Guaranteed to be non-NULL because remotes are never deleted.
- */
-static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
-{
- if (rcu_access_pointer(fdb->nh))
- return NULL;
- return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
-}
-
-static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
-{
- if (rcu_access_pointer(fdb->nh))
- return NULL;
- return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
-}
-
-/* Find VXLAN socket based on network namespace, address family, UDP port,
- * enabled unshareable flags and socket device binding (see l3mdev with
- * non-default VRF).
- */
-static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
- __be16 port, u32 flags, int ifindex)
-{
- struct vxlan_sock *vs;
-
- flags &= VXLAN_F_RCV_FLAGS;
-
- hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
- if (inet_sk(vs->sock->sk)->inet_sport == port &&
- vxlan_get_sk_family(vs) == family &&
- vs->flags == flags &&
- vs->sock->sk->sk_bound_dev_if == ifindex)
- return vs;
- }
- return NULL;
-}
-
-static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
- __be32 vni)
-{
- struct vxlan_dev_node *node;
-
- /* For flow based devices, map all packets to VNI 0 */
- if (vs->flags & VXLAN_F_COLLECT_METADATA)
- vni = 0;
-
- hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
- if (node->vxlan->default_dst.remote_vni != vni)
- continue;
-
- if (IS_ENABLED(CONFIG_IPV6)) {
- const struct vxlan_config *cfg = &node->vxlan->cfg;
-
- if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
- cfg->remote_ifindex != ifindex)
- continue;
- }
-
- return node->vxlan;
- }
-
- return NULL;
-}
-
-/* Look up VNI in a per net namespace table */
-static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
- __be32 vni, sa_family_t family,
- __be16 port, u32 flags)
-{
- struct vxlan_sock *vs;
-
- vs = vxlan_find_sock(net, family, port, flags, ifindex);
- if (!vs)
- return NULL;
-
- return vxlan_vs_find_vni(vs, ifindex, vni);
-}
-
-/* Fill in neighbour message in skbuff. */
-static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
- const struct vxlan_fdb *fdb,
- u32 portid, u32 seq, int type, unsigned int flags,
- const struct vxlan_rdst *rdst)
-{
- unsigned long now = jiffies;
- struct nda_cacheinfo ci;
- bool send_ip, send_eth;
- struct nlmsghdr *nlh;
- struct nexthop *nh;
- struct ndmsg *ndm;
- int nh_family;
- u32 nh_id;
-
- nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
- if (nlh == NULL)
- return -EMSGSIZE;
-
- ndm = nlmsg_data(nlh);
- memset(ndm, 0, sizeof(*ndm));
-
- send_eth = send_ip = true;
-
- rcu_read_lock();
- nh = rcu_dereference(fdb->nh);
- if (nh) {
- nh_family = nexthop_get_family(nh);
- nh_id = nh->id;
- }
- rcu_read_unlock();
-
- if (type == RTM_GETNEIGH) {
- if (rdst) {
- send_ip = !vxlan_addr_any(&rdst->remote_ip);
- ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
- } else if (nh) {
- ndm->ndm_family = nh_family;
- }
- send_eth = !is_zero_ether_addr(fdb->eth_addr);
- } else
- ndm->ndm_family = AF_BRIDGE;
- ndm->ndm_state = fdb->state;
- ndm->ndm_ifindex = vxlan->dev->ifindex;
- ndm->ndm_flags = fdb->flags;
- if (rdst && rdst->offloaded)
- ndm->ndm_flags |= NTF_OFFLOADED;
- ndm->ndm_type = RTN_UNICAST;
-
- if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
- nla_put_s32(skb, NDA_LINK_NETNSID,
- peernet2id(dev_net(vxlan->dev), vxlan->net)))
- goto nla_put_failure;
-
- if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
- goto nla_put_failure;
- if (nh) {
- if (nla_put_u32(skb, NDA_NH_ID, nh_id))
- goto nla_put_failure;
- } else if (rdst) {
- if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
- &rdst->remote_ip))
- goto nla_put_failure;
-
- if (rdst->remote_port &&
- rdst->remote_port != vxlan->cfg.dst_port &&
- nla_put_be16(skb, NDA_PORT, rdst->remote_port))
- goto nla_put_failure;
- if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
- nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
- goto nla_put_failure;
- if (rdst->remote_ifindex &&
- nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
- goto nla_put_failure;
- }
-
- if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
- nla_put_u32(skb, NDA_SRC_VNI,
- be32_to_cpu(fdb->vni)))
- goto nla_put_failure;
-
- ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
- ci.ndm_confirmed = 0;
- ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
- ci.ndm_refcnt = 0;
-
- if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
- goto nla_put_failure;
-
- nlmsg_end(skb, nlh);
- return 0;
-
-nla_put_failure:
- nlmsg_cancel(skb, nlh);
- return -EMSGSIZE;
-}
-
-static inline size_t vxlan_nlmsg_size(void)
-{
- return NLMSG_ALIGN(sizeof(struct ndmsg))
- + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
- + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
- + nla_total_size(sizeof(__be16)) /* NDA_PORT */
- + nla_total_size(sizeof(__be32)) /* NDA_VNI */
- + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
- + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
- + nla_total_size(sizeof(struct nda_cacheinfo));
-}
-
-static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
- struct vxlan_rdst *rd, int type)
-{
- struct net *net = dev_net(vxlan->dev);
- struct sk_buff *skb;
- int err = -ENOBUFS;
-
- skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
- if (skb == NULL)
- goto errout;
-
- err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
- if (err < 0) {
- /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
- WARN_ON(err == -EMSGSIZE);
- kfree_skb(skb);
- goto errout;
- }
-
- rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
- return;
-errout:
- if (err < 0)
- rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
-}
-
-static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
- const struct vxlan_fdb *fdb,
- const struct vxlan_rdst *rd,
- struct netlink_ext_ack *extack,
- struct switchdev_notifier_vxlan_fdb_info *fdb_info)
-{
- fdb_info->info.dev = vxlan->dev;
- fdb_info->info.extack = extack;
- fdb_info->remote_ip = rd->remote_ip;
- fdb_info->remote_port = rd->remote_port;
- fdb_info->remote_vni = rd->remote_vni;
- fdb_info->remote_ifindex = rd->remote_ifindex;
- memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
- fdb_info->vni = fdb->vni;
- fdb_info->offloaded = rd->offloaded;
- fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
-}
-
-static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
- struct vxlan_fdb *fdb,
- struct vxlan_rdst *rd,
- bool adding,
- struct netlink_ext_ack *extack)
-{
- struct switchdev_notifier_vxlan_fdb_info info;
- enum switchdev_notifier_type notifier_type;
- int ret;
-
- if (WARN_ON(!rd))
- return 0;
-
- notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
- : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
- vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
- ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
- &info.info, extack);
- return notifier_to_errno(ret);
-}
-
-static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
- struct vxlan_rdst *rd, int type, bool swdev_notify,
- struct netlink_ext_ack *extack)
-{
- int err;
-
- if (swdev_notify && rd) {
- switch (type) {
- case RTM_NEWNEIGH:
- err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
- true, extack);
- if (err)
- return err;
- break;
- case RTM_DELNEIGH:
- vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
- false, extack);
- break;
- }
- }
-
- __vxlan_fdb_notify(vxlan, fdb, rd, type);
- return 0;
-}
-
-static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_fdb f = {
- .state = NUD_STALE,
- };
- struct vxlan_rdst remote = {
- .remote_ip = *ipa, /* goes to NDA_DST */
- .remote_vni = cpu_to_be32(VXLAN_N_VID),
- };
-
- vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
-}
-
-static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
-{
- struct vxlan_fdb f = {
- .state = NUD_STALE,
- };
- struct vxlan_rdst remote = { };
-
- memcpy(f.eth_addr, eth_addr, ETH_ALEN);
-
- vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
-}
-
-/* Hash Ethernet address */
-static u32 eth_hash(const unsigned char *addr)
-{
- u64 value = get_unaligned((u64 *)addr);
-
- /* only want 6 bytes */
-#ifdef __BIG_ENDIAN
- value >>= 16;
-#else
- value <<= 16;
-#endif
- return hash_64(value, FDB_HASH_BITS);
-}
-
-static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
-{
- /* use 1 byte of OUI and 3 bytes of NIC */
- u32 key = get_unaligned((u32 *)(addr + 2));
-
- return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
-}
-
-static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
-{
- if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
- return eth_vni_hash(mac, vni);
- else
- return eth_hash(mac);
-}
-
-/* Hash chain to use given mac address */
-static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
- const u8 *mac, __be32 vni)
-{
- return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
-}
-
-/* Look up Ethernet address in forwarding table */
-static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
- const u8 *mac, __be32 vni)
-{
- struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
- struct vxlan_fdb *f;
-
- hlist_for_each_entry_rcu(f, head, hlist) {
- if (ether_addr_equal(mac, f->eth_addr)) {
- if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
- if (vni == f->vni)
- return f;
- } else {
- return f;
- }
- }
- }
-
- return NULL;
-}
-
-static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
- const u8 *mac, __be32 vni)
-{
- struct vxlan_fdb *f;
-
- f = __vxlan_find_mac(vxlan, mac, vni);
- if (f && f->used != jiffies)
- f->used = jiffies;
-
- return f;
-}
-
-/* caller should hold vxlan->hash_lock */
-static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
- union vxlan_addr *ip, __be16 port,
- __be32 vni, __u32 ifindex)
-{
- struct vxlan_rdst *rd;
-
- list_for_each_entry(rd, &f->remotes, list) {
- if (vxlan_addr_equal(&rd->remote_ip, ip) &&
- rd->remote_port == port &&
- rd->remote_vni == vni &&
- rd->remote_ifindex == ifindex)
- return rd;
- }
-
- return NULL;
-}
-
-int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
- struct switchdev_notifier_vxlan_fdb_info *fdb_info)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- u8 eth_addr[ETH_ALEN + 2] = { 0 };
- struct vxlan_rdst *rdst;
- struct vxlan_fdb *f;
- int rc = 0;
-
- if (is_multicast_ether_addr(mac) ||
- is_zero_ether_addr(mac))
- return -EINVAL;
-
- ether_addr_copy(eth_addr, mac);
-
- rcu_read_lock();
-
- f = __vxlan_find_mac(vxlan, eth_addr, vni);
- if (!f) {
- rc = -ENOENT;
- goto out;
- }
-
- rdst = first_remote_rcu(f);
- vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
-
-out:
- rcu_read_unlock();
- return rc;
-}
-EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
-
-static int vxlan_fdb_notify_one(struct notifier_block *nb,
- const struct vxlan_dev *vxlan,
- const struct vxlan_fdb *f,
- const struct vxlan_rdst *rdst,
- struct netlink_ext_ack *extack)
-{
- struct switchdev_notifier_vxlan_fdb_info fdb_info;
- int rc;
-
- vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
- rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
- &fdb_info);
- return notifier_to_errno(rc);
-}
-
-int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
- struct notifier_block *nb,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_dev *vxlan;
- struct vxlan_rdst *rdst;
- struct vxlan_fdb *f;
- unsigned int h;
- int rc = 0;
-
- if (!netif_is_vxlan(dev))
- return -EINVAL;
- vxlan = netdev_priv(dev);
-
- for (h = 0; h < FDB_HASH_SIZE; ++h) {
- spin_lock_bh(&vxlan->hash_lock[h]);
- hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
- if (f->vni == vni) {
- list_for_each_entry(rdst, &f->remotes, list) {
- rc = vxlan_fdb_notify_one(nb, vxlan,
- f, rdst,
- extack);
- if (rc)
- goto unlock;
- }
- }
- }
- spin_unlock_bh(&vxlan->hash_lock[h]);
- }
- return 0;
-
-unlock:
- spin_unlock_bh(&vxlan->hash_lock[h]);
- return rc;
-}
-EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
-
-void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
-{
- struct vxlan_dev *vxlan;
- struct vxlan_rdst *rdst;
- struct vxlan_fdb *f;
- unsigned int h;
-
- if (!netif_is_vxlan(dev))
- return;
- vxlan = netdev_priv(dev);
-
- for (h = 0; h < FDB_HASH_SIZE; ++h) {
- spin_lock_bh(&vxlan->hash_lock[h]);
- hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
- if (f->vni == vni)
- list_for_each_entry(rdst, &f->remotes, list)
- rdst->offloaded = false;
- spin_unlock_bh(&vxlan->hash_lock[h]);
- }
-
-}
-EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
-
-/* Replace destination of unicast mac */
-static int vxlan_fdb_replace(struct vxlan_fdb *f,
- union vxlan_addr *ip, __be16 port, __be32 vni,
- __u32 ifindex, struct vxlan_rdst *oldrd)
-{
- struct vxlan_rdst *rd;
-
- rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
- if (rd)
- return 0;
-
- rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
- if (!rd)
- return 0;
-
- *oldrd = *rd;
- dst_cache_reset(&rd->dst_cache);
- rd->remote_ip = *ip;
- rd->remote_port = port;
- rd->remote_vni = vni;
- rd->remote_ifindex = ifindex;
- rd->offloaded = false;
- return 1;
-}
-
-/* Add/update destinations for multicast */
-static int vxlan_fdb_append(struct vxlan_fdb *f,
- union vxlan_addr *ip, __be16 port, __be32 vni,
- __u32 ifindex, struct vxlan_rdst **rdp)
-{
- struct vxlan_rdst *rd;
-
- rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
- if (rd)
- return 0;
-
- rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
- if (rd == NULL)
- return -ENOBUFS;
-
- if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
- kfree(rd);
- return -ENOBUFS;
- }
-
- rd->remote_ip = *ip;
- rd->remote_port = port;
- rd->offloaded = false;
- rd->remote_vni = vni;
- rd->remote_ifindex = ifindex;
-
- list_add_tail_rcu(&rd->list, &f->remotes);
-
- *rdp = rd;
- return 1;
-}
-
-static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
- unsigned int off,
- struct vxlanhdr *vh, size_t hdrlen,
- __be32 vni_field,
- struct gro_remcsum *grc,
- bool nopartial)
-{
- size_t start, offset;
-
- if (skb->remcsum_offload)
- return vh;
-
- if (!NAPI_GRO_CB(skb)->csum_valid)
- return NULL;
-
- start = vxlan_rco_start(vni_field);
- offset = start + vxlan_rco_offset(vni_field);
-
- vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
- start, offset, grc, nopartial);
-
- skb->remcsum_offload = 1;
-
- return vh;
-}
-
-static struct sk_buff *vxlan_gro_receive(struct sock *sk,
- struct list_head *head,
- struct sk_buff *skb)
-{
- struct sk_buff *pp = NULL;
- struct sk_buff *p;
- struct vxlanhdr *vh, *vh2;
- unsigned int hlen, off_vx;
- int flush = 1;
- struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
- __be32 flags;
- struct gro_remcsum grc;
-
- skb_gro_remcsum_init(&grc);
-
- off_vx = skb_gro_offset(skb);
- hlen = off_vx + sizeof(*vh);
- vh = skb_gro_header_fast(skb, off_vx);
- if (skb_gro_header_hard(skb, hlen)) {
- vh = skb_gro_header_slow(skb, hlen, off_vx);
- if (unlikely(!vh))
- goto out;
- }
-
- skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
-
- flags = vh->vx_flags;
-
- if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
- vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
- vh->vx_vni, &grc,
- !!(vs->flags &
- VXLAN_F_REMCSUM_NOPARTIAL));
-
- if (!vh)
- goto out;
- }
-
- skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
-
- list_for_each_entry(p, head, list) {
- if (!NAPI_GRO_CB(p)->same_flow)
- continue;
-
- vh2 = (struct vxlanhdr *)(p->data + off_vx);
- if (vh->vx_flags != vh2->vx_flags ||
- vh->vx_vni != vh2->vx_vni) {
- NAPI_GRO_CB(p)->same_flow = 0;
- continue;
- }
- }
-
- pp = call_gro_receive(eth_gro_receive, head, skb);
- flush = 0;
-
-out:
- skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
-
- return pp;
-}
-
-static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
-{
- /* Sets 'skb->inner_mac_header' since we are always called with
- * 'skb->encapsulation' set.
- */
- return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
-}
-
-static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
- __u16 state, __be32 src_vni,
- __u16 ndm_flags)
-{
- struct vxlan_fdb *f;
-
- f = kmalloc(sizeof(*f), GFP_ATOMIC);
- if (!f)
- return NULL;
- f->state = state;
- f->flags = ndm_flags;
- f->updated = f->used = jiffies;
- f->vni = src_vni;
- f->nh = NULL;
- RCU_INIT_POINTER(f->vdev, vxlan);
- INIT_LIST_HEAD(&f->nh_list);
- INIT_LIST_HEAD(&f->remotes);
- memcpy(f->eth_addr, mac, ETH_ALEN);
-
- return f;
-}
-
-static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
- __be32 src_vni, struct vxlan_fdb *f)
-{
- ++vxlan->addrcnt;
- hlist_add_head_rcu(&f->hlist,
- vxlan_fdb_head(vxlan, mac, src_vni));
-}
-
-static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
- u32 nhid, struct netlink_ext_ack *extack)
-{
- struct nexthop *old_nh = rtnl_dereference(fdb->nh);
- struct nexthop *nh;
- int err = -EINVAL;
-
- if (old_nh && old_nh->id == nhid)
- return 0;
-
- nh = nexthop_find_by_id(vxlan->net, nhid);
- if (!nh) {
- NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
- goto err_inval;
- }
-
- if (nh) {
- if (!nexthop_get(nh)) {
- NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
- nh = NULL;
- goto err_inval;
- }
- if (!nexthop_is_fdb(nh)) {
- NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
- goto err_inval;
- }
-
- if (!nexthop_is_multipath(nh)) {
- NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
- goto err_inval;
- }
-
- /* check nexthop group family */
- switch (vxlan->default_dst.remote_ip.sa.sa_family) {
- case AF_INET:
- if (!nexthop_has_v4(nh)) {
- err = -EAFNOSUPPORT;
- NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
- goto err_inval;
- }
- break;
- case AF_INET6:
- if (nexthop_has_v4(nh)) {
- err = -EAFNOSUPPORT;
- NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
- goto err_inval;
- }
- }
- }
-
- if (old_nh) {
- list_del_rcu(&fdb->nh_list);
- nexthop_put(old_nh);
- }
- rcu_assign_pointer(fdb->nh, nh);
- list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
- return 1;
-
-err_inval:
- if (nh)
- nexthop_put(nh);
- return err;
-}
-
-static int vxlan_fdb_create(struct vxlan_dev *vxlan,
- const u8 *mac, union vxlan_addr *ip,
- __u16 state, __be16 port, __be32 src_vni,
- __be32 vni, __u32 ifindex, __u16 ndm_flags,
- u32 nhid, struct vxlan_fdb **fdb,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_rdst *rd = NULL;
- struct vxlan_fdb *f;
- int rc;
-
- if (vxlan->cfg.addrmax &&
- vxlan->addrcnt >= vxlan->cfg.addrmax)
- return -ENOSPC;
-
- netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
- f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
- if (!f)
- return -ENOMEM;
-
- if (nhid)
- rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
- else
- rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
- if (rc < 0)
- goto errout;
-
- *fdb = f;
-
- return 0;
-
-errout:
- kfree(f);
- return rc;
-}
-
-static void __vxlan_fdb_free(struct vxlan_fdb *f)
-{
- struct vxlan_rdst *rd, *nd;
- struct nexthop *nh;
-
- nh = rcu_dereference_raw(f->nh);
- if (nh) {
- rcu_assign_pointer(f->nh, NULL);
- rcu_assign_pointer(f->vdev, NULL);
- nexthop_put(nh);
- }
-
- list_for_each_entry_safe(rd, nd, &f->remotes, list) {
- dst_cache_destroy(&rd->dst_cache);
- kfree(rd);
- }
- kfree(f);
-}
-
-static void vxlan_fdb_free(struct rcu_head *head)
-{
- struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
-
- __vxlan_fdb_free(f);
-}
-
-static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
- bool do_notify, bool swdev_notify)
-{
- struct vxlan_rdst *rd;
-
- netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
-
- --vxlan->addrcnt;
- if (do_notify) {
- if (rcu_access_pointer(f->nh))
- vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
- swdev_notify, NULL);
- else
- list_for_each_entry(rd, &f->remotes, list)
- vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
- swdev_notify, NULL);
- }
-
- hlist_del_rcu(&f->hlist);
- list_del_rcu(&f->nh_list);
- call_rcu(&f->rcu, vxlan_fdb_free);
-}
-
-static void vxlan_dst_free(struct rcu_head *head)
-{
- struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
-
- dst_cache_destroy(&rd->dst_cache);
- kfree(rd);
-}
-
-static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
- union vxlan_addr *ip,
- __u16 state, __u16 flags,
- __be16 port, __be32 vni,
- __u32 ifindex, __u16 ndm_flags,
- struct vxlan_fdb *f, u32 nhid,
- bool swdev_notify,
- struct netlink_ext_ack *extack)
-{
- __u16 fdb_flags = (ndm_flags & ~NTF_USE);
- struct vxlan_rdst *rd = NULL;
- struct vxlan_rdst oldrd;
- int notify = 0;
- int rc = 0;
- int err;
-
- if (nhid && !rcu_access_pointer(f->nh)) {
- NL_SET_ERR_MSG(extack,
- "Cannot replace an existing non nexthop fdb with a nexthop");
- return -EOPNOTSUPP;
- }
-
- if (nhid && (flags & NLM_F_APPEND)) {
- NL_SET_ERR_MSG(extack,
- "Cannot append to a nexthop fdb");
- return -EOPNOTSUPP;
- }
-
- /* Do not allow an externally learned entry to take over an entry added
- * by the user.
- */
- if (!(fdb_flags & NTF_EXT_LEARNED) ||
- !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
- if (f->state != state) {
- f->state = state;
- f->updated = jiffies;
- notify = 1;
- }
- if (f->flags != fdb_flags) {
- f->flags = fdb_flags;
- f->updated = jiffies;
- notify = 1;
- }
- }
-
- if ((flags & NLM_F_REPLACE)) {
- /* Only change unicasts */
- if (!(is_multicast_ether_addr(f->eth_addr) ||
- is_zero_ether_addr(f->eth_addr))) {
- if (nhid) {
- rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
- if (rc < 0)
- return rc;
- } else {
- rc = vxlan_fdb_replace(f, ip, port, vni,
- ifindex, &oldrd);
- }
- notify |= rc;
- } else {
- NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
- return -EOPNOTSUPP;
- }
- }
- if ((flags & NLM_F_APPEND) &&
- (is_multicast_ether_addr(f->eth_addr) ||
- is_zero_ether_addr(f->eth_addr))) {
- rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
-
- if (rc < 0)
- return rc;
- notify |= rc;
- }
-
- if (ndm_flags & NTF_USE)
- f->used = jiffies;
-
- if (notify) {
- if (rd == NULL)
- rd = first_remote_rtnl(f);
-
- err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
- swdev_notify, extack);
- if (err)
- goto err_notify;
- }
-
- return 0;
-
-err_notify:
- if (nhid)
- return err;
- if ((flags & NLM_F_REPLACE) && rc)
- *rd = oldrd;
- else if ((flags & NLM_F_APPEND) && rc) {
- list_del_rcu(&rd->list);
- call_rcu(&rd->rcu, vxlan_dst_free);
- }
- return err;
-}
-
-static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
- const u8 *mac, union vxlan_addr *ip,
- __u16 state, __u16 flags,
- __be16 port, __be32 src_vni, __be32 vni,
- __u32 ifindex, __u16 ndm_flags, u32 nhid,
- bool swdev_notify,
- struct netlink_ext_ack *extack)
-{
- __u16 fdb_flags = (ndm_flags & ~NTF_USE);
- struct vxlan_fdb *f;
- int rc;
-
- /* Disallow replace to add a multicast entry */
- if ((flags & NLM_F_REPLACE) &&
- (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
- return -EOPNOTSUPP;
-
- netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
- rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
- vni, ifindex, fdb_flags, nhid, &f, extack);
- if (rc < 0)
- return rc;
-
- vxlan_fdb_insert(vxlan, mac, src_vni, f);
- rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
- swdev_notify, extack);
- if (rc)
- goto err_notify;
-
- return 0;
-
-err_notify:
- vxlan_fdb_destroy(vxlan, f, false, false);
- return rc;
-}
-
-/* Add new entry to forwarding table -- assumes lock held */
-static int vxlan_fdb_update(struct vxlan_dev *vxlan,
- const u8 *mac, union vxlan_addr *ip,
- __u16 state, __u16 flags,
- __be16 port, __be32 src_vni, __be32 vni,
- __u32 ifindex, __u16 ndm_flags, u32 nhid,
- bool swdev_notify,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_fdb *f;
-
- f = __vxlan_find_mac(vxlan, mac, src_vni);
- if (f) {
- if (flags & NLM_F_EXCL) {
- netdev_dbg(vxlan->dev,
- "lost race to create %pM\n", mac);
- return -EEXIST;
- }
-
- return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
- vni, ifindex, ndm_flags, f,
- nhid, swdev_notify, extack);
- } else {
- if (!(flags & NLM_F_CREATE))
- return -ENOENT;
-
- return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
- port, src_vni, vni, ifindex,
- ndm_flags, nhid, swdev_notify,
- extack);
- }
-}
-
-static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
- struct vxlan_rdst *rd, bool swdev_notify)
-{
- list_del_rcu(&rd->list);
- vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
- call_rcu(&rd->rcu, vxlan_dst_free);
-}
-
-static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
- union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
- __be32 *vni, u32 *ifindex, u32 *nhid)
-{
- struct net *net = dev_net(vxlan->dev);
- int err;
-
- if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
- tb[NDA_PORT]))
- return -EINVAL;
-
- if (tb[NDA_DST]) {
- err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
- if (err)
- return err;
- } else {
- union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
-
- if (remote->sa.sa_family == AF_INET) {
- ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
- ip->sa.sa_family = AF_INET;
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- ip->sin6.sin6_addr = in6addr_any;
- ip->sa.sa_family = AF_INET6;
-#endif
- }
- }
-
- if (tb[NDA_PORT]) {
- if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
- return -EINVAL;
- *port = nla_get_be16(tb[NDA_PORT]);
- } else {
- *port = vxlan->cfg.dst_port;
- }
-
- if (tb[NDA_VNI]) {
- if (nla_len(tb[NDA_VNI]) != sizeof(u32))
- return -EINVAL;
- *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
- } else {
- *vni = vxlan->default_dst.remote_vni;
- }
-
- if (tb[NDA_SRC_VNI]) {
- if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
- return -EINVAL;
- *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
- } else {
- *src_vni = vxlan->default_dst.remote_vni;
- }
-
- if (tb[NDA_IFINDEX]) {
- struct net_device *tdev;
-
- if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
- return -EINVAL;
- *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
- tdev = __dev_get_by_index(net, *ifindex);
- if (!tdev)
- return -EADDRNOTAVAIL;
- } else {
- *ifindex = 0;
- }
-
- if (tb[NDA_NH_ID])
- *nhid = nla_get_u32(tb[NDA_NH_ID]);
- else
- *nhid = 0;
-
- return 0;
-}
-
-/* Add static entry (via netlink) */
-static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
- struct net_device *dev,
- const unsigned char *addr, u16 vid, u16 flags,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- /* struct net *net = dev_net(vxlan->dev); */
- union vxlan_addr ip;
- __be16 port;
- __be32 src_vni, vni;
- u32 ifindex, nhid;
- u32 hash_index;
- int err;
-
- if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
- pr_info("RTM_NEWNEIGH with invalid state %#x\n",
- ndm->ndm_state);
- return -EINVAL;
- }
-
- if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
- return -EINVAL;
-
- err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
- &nhid);
- if (err)
- return err;
-
- if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
- return -EAFNOSUPPORT;
-
- hash_index = fdb_head_index(vxlan, addr, src_vni);
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
- err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
- port, src_vni, vni, ifindex,
- ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
- nhid, true, extack);
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
-
- return err;
-}
-
-static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
- const unsigned char *addr, union vxlan_addr ip,
- __be16 port, __be32 src_vni, __be32 vni,
- u32 ifindex, bool swdev_notify)
-{
- struct vxlan_rdst *rd = NULL;
- struct vxlan_fdb *f;
- int err = -ENOENT;
-
- f = vxlan_find_mac(vxlan, addr, src_vni);
- if (!f)
- return err;
-
- if (!vxlan_addr_any(&ip)) {
- rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
- if (!rd)
- goto out;
- }
-
- /* remove a destination if it's not the only one on the list,
- * otherwise destroy the fdb entry
- */
- if (rd && !list_is_singular(&f->remotes)) {
- vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
- goto out;
- }
-
- vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
-
-out:
- return 0;
-}
-
-/* Delete entry (via netlink) */
-static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
- struct net_device *dev,
- const unsigned char *addr, u16 vid)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- union vxlan_addr ip;
- __be32 src_vni, vni;
- u32 ifindex, nhid;
- u32 hash_index;
- __be16 port;
- int err;
-
- err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
- &nhid);
- if (err)
- return err;
-
- hash_index = fdb_head_index(vxlan, addr, src_vni);
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
- err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
- true);
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
-
- return err;
-}
-
-/* Dump forwarding table */
-static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
- struct net_device *dev,
- struct net_device *filter_dev, int *idx)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- unsigned int h;
- int err = 0;
-
- for (h = 0; h < FDB_HASH_SIZE; ++h) {
- struct vxlan_fdb *f;
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
- struct vxlan_rdst *rd;
-
- if (rcu_access_pointer(f->nh)) {
- if (*idx < cb->args[2])
- goto skip_nh;
- err = vxlan_fdb_info(skb, vxlan, f,
- NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- RTM_NEWNEIGH,
- NLM_F_MULTI, NULL);
- if (err < 0) {
- rcu_read_unlock();
- goto out;
- }
-skip_nh:
- *idx += 1;
- continue;
- }
-
- list_for_each_entry_rcu(rd, &f->remotes, list) {
- if (*idx < cb->args[2])
- goto skip;
-
- err = vxlan_fdb_info(skb, vxlan, f,
- NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- RTM_NEWNEIGH,
- NLM_F_MULTI, rd);
- if (err < 0) {
- rcu_read_unlock();
- goto out;
- }
-skip:
- *idx += 1;
- }
- }
- rcu_read_unlock();
- }
-out:
- return err;
-}
-
-static int vxlan_fdb_get(struct sk_buff *skb,
- struct nlattr *tb[],
- struct net_device *dev,
- const unsigned char *addr,
- u16 vid, u32 portid, u32 seq,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_fdb *f;
- __be32 vni;
- int err;
-
- if (tb[NDA_VNI])
- vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
- else
- vni = vxlan->default_dst.remote_vni;
-
- rcu_read_lock();
-
- f = __vxlan_find_mac(vxlan, addr, vni);
- if (!f) {
- NL_SET_ERR_MSG(extack, "Fdb entry not found");
- err = -ENOENT;
- goto errout;
- }
-
- err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
- RTM_NEWNEIGH, 0, first_remote_rcu(f));
-errout:
- rcu_read_unlock();
- return err;
-}
-
-/* Watch incoming packets to learn mapping between Ethernet address
- * and Tunnel endpoint.
- * Return true if packet is bogus and should be dropped.
- */
-static bool vxlan_snoop(struct net_device *dev,
- union vxlan_addr *src_ip, const u8 *src_mac,
- u32 src_ifindex, __be32 vni)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_fdb *f;
- u32 ifindex = 0;
-
-#if IS_ENABLED(CONFIG_IPV6)
- if (src_ip->sa.sa_family == AF_INET6 &&
- (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
- ifindex = src_ifindex;
-#endif
-
- f = vxlan_find_mac(vxlan, src_mac, vni);
- if (likely(f)) {
- struct vxlan_rdst *rdst = first_remote_rcu(f);
-
- if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
- rdst->remote_ifindex == ifindex))
- return false;
-
- /* Don't migrate static entries, drop packets */
- if (f->state & (NUD_PERMANENT | NUD_NOARP))
- return true;
-
- /* Don't override an fdb with nexthop with a learnt entry */
- if (rcu_access_pointer(f->nh))
- return true;
-
- if (net_ratelimit())
- netdev_info(dev,
- "%pM migrated from %pIS to %pIS\n",
- src_mac, &rdst->remote_ip.sa, &src_ip->sa);
-
- rdst->remote_ip = *src_ip;
- f->updated = jiffies;
- vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
- } else {
- u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
-
- /* learned new entry */
- spin_lock(&vxlan->hash_lock[hash_index]);
-
- /* close off race between vxlan_flush and incoming packets */
- if (netif_running(dev))
- vxlan_fdb_update(vxlan, src_mac, src_ip,
- NUD_REACHABLE,
- NLM_F_EXCL|NLM_F_CREATE,
- vxlan->cfg.dst_port,
- vni,
- vxlan->default_dst.remote_vni,
- ifindex, NTF_SELF, 0, true, NULL);
- spin_unlock(&vxlan->hash_lock[hash_index]);
- }
-
- return false;
-}
-
-/* See if multicast group is already in use by other ID */
-static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
-{
- struct vxlan_dev *vxlan;
- struct vxlan_sock *sock4;
-#if IS_ENABLED(CONFIG_IPV6)
- struct vxlan_sock *sock6;
-#endif
- unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
-
- sock4 = rtnl_dereference(dev->vn4_sock);
-
- /* The vxlan_sock is only used by dev, leaving group has
- * no effect on other vxlan devices.
- */
- if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
- return false;
-#if IS_ENABLED(CONFIG_IPV6)
- sock6 = rtnl_dereference(dev->vn6_sock);
- if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
- return false;
-#endif
-
- list_for_each_entry(vxlan, &vn->vxlan_list, next) {
- if (!netif_running(vxlan->dev) || vxlan == dev)
- continue;
-
- if (family == AF_INET &&
- rtnl_dereference(vxlan->vn4_sock) != sock4)
- continue;
-#if IS_ENABLED(CONFIG_IPV6)
- if (family == AF_INET6 &&
- rtnl_dereference(vxlan->vn6_sock) != sock6)
- continue;
-#endif
-
- if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
- &dev->default_dst.remote_ip))
- continue;
-
- if (vxlan->default_dst.remote_ifindex !=
- dev->default_dst.remote_ifindex)
- continue;
-
- return true;
- }
-
- return false;
-}
-
-static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
-{
- struct vxlan_net *vn;
-
- if (!vs)
- return false;
- if (!refcount_dec_and_test(&vs->refcnt))
- return false;
-
- vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
- spin_lock(&vn->sock_lock);
- hlist_del_rcu(&vs->hlist);
- udp_tunnel_notify_del_rx_port(vs->sock,
- (vs->flags & VXLAN_F_GPE) ?
- UDP_TUNNEL_TYPE_VXLAN_GPE :
- UDP_TUNNEL_TYPE_VXLAN);
- spin_unlock(&vn->sock_lock);
-
- return true;
-}
-
-static void vxlan_sock_release(struct vxlan_dev *vxlan)
-{
- struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
-#if IS_ENABLED(CONFIG_IPV6)
- struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
-
- RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
-#endif
-
- RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
- synchronize_net();
-
- vxlan_vs_del_dev(vxlan);
-
- if (__vxlan_sock_release_prep(sock4)) {
- udp_tunnel_sock_release(sock4->sock);
- kfree(sock4);
- }
-
-#if IS_ENABLED(CONFIG_IPV6)
- if (__vxlan_sock_release_prep(sock6)) {
- udp_tunnel_sock_release(sock6->sock);
- kfree(sock6);
- }
-#endif
-}
-
-/* Update multicast group membership when first VNI on
- * multicast address is brought up
- */
-static int vxlan_igmp_join(struct vxlan_dev *vxlan)
-{
- struct sock *sk;
- union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
- int ifindex = vxlan->default_dst.remote_ifindex;
- int ret = -EINVAL;
-
- if (ip->sa.sa_family == AF_INET) {
- struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
- struct ip_mreqn mreq = {
- .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
- .imr_ifindex = ifindex,
- };
-
- sk = sock4->sock->sk;
- lock_sock(sk);
- ret = ip_mc_join_group(sk, &mreq);
- release_sock(sk);
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
-
- sk = sock6->sock->sk;
- lock_sock(sk);
- ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
- &ip->sin6.sin6_addr);
- release_sock(sk);
-#endif
- }
-
- return ret;
-}
-
-/* Inverse of vxlan_igmp_join when last VNI is brought down */
-static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
-{
- struct sock *sk;
- union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
- int ifindex = vxlan->default_dst.remote_ifindex;
- int ret = -EINVAL;
-
- if (ip->sa.sa_family == AF_INET) {
- struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
- struct ip_mreqn mreq = {
- .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
- .imr_ifindex = ifindex,
- };
-
- sk = sock4->sock->sk;
- lock_sock(sk);
- ret = ip_mc_leave_group(sk, &mreq);
- release_sock(sk);
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
-
- sk = sock6->sock->sk;
- lock_sock(sk);
- ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
- &ip->sin6.sin6_addr);
- release_sock(sk);
-#endif
- }
-
- return ret;
-}
-
-static bool vxlan_remcsum(struct vxlanhdr *unparsed,
- struct sk_buff *skb, u32 vxflags)
-{
- size_t start, offset;
-
- if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
- goto out;
-
- start = vxlan_rco_start(unparsed->vx_vni);
- offset = start + vxlan_rco_offset(unparsed->vx_vni);
-
- if (!pskb_may_pull(skb, offset + sizeof(u16)))
- return false;
-
- skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
- !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
-out:
- unparsed->vx_flags &= ~VXLAN_HF_RCO;
- unparsed->vx_vni &= VXLAN_VNI_MASK;
- return true;
-}
-
-static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
- struct sk_buff *skb, u32 vxflags,
- struct vxlan_metadata *md)
-{
- struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
- struct metadata_dst *tun_dst;
-
- if (!(unparsed->vx_flags & VXLAN_HF_GBP))
- goto out;
-
- md->gbp = ntohs(gbp->policy_id);
-
- tun_dst = (struct metadata_dst *)skb_dst(skb);
- if (tun_dst) {
- tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
- tun_dst->u.tun_info.options_len = sizeof(*md);
- }
- if (gbp->dont_learn)
- md->gbp |= VXLAN_GBP_DONT_LEARN;
-
- if (gbp->policy_applied)
- md->gbp |= VXLAN_GBP_POLICY_APPLIED;
-
- /* In flow-based mode, GBP is carried in dst_metadata */
- if (!(vxflags & VXLAN_F_COLLECT_METADATA))
- skb->mark = md->gbp;
-out:
- unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
-}
-
-static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
- __be16 *protocol,
- struct sk_buff *skb, u32 vxflags)
-{
- struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
-
- /* Need to have Next Protocol set for interfaces in GPE mode. */
- if (!gpe->np_applied)
- return false;
- /* "The initial version is 0. If a receiver does not support the
- * version indicated it MUST drop the packet.
- */
- if (gpe->version != 0)
- return false;
- /* "When the O bit is set to 1, the packet is an OAM packet and OAM
- * processing MUST occur." However, we don't implement OAM
- * processing, thus drop the packet.
- */
- if (gpe->oam_flag)
- return false;
-
- *protocol = tun_p_to_eth_p(gpe->next_protocol);
- if (!*protocol)
- return false;
-
- unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
- return true;
-}
-
-static bool vxlan_set_mac(struct vxlan_dev *vxlan,
- struct vxlan_sock *vs,
- struct sk_buff *skb, __be32 vni)
-{
- union vxlan_addr saddr;
- u32 ifindex = skb->dev->ifindex;
-
- skb_reset_mac_header(skb);
- skb->protocol = eth_type_trans(skb, vxlan->dev);
- skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
-
- /* Ignore packet loops (and multicast echo) */
- if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
- return false;
-
- /* Get address from the outer IP header */
- if (vxlan_get_sk_family(vs) == AF_INET) {
- saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
- saddr.sa.sa_family = AF_INET;
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
- saddr.sa.sa_family = AF_INET6;
-#endif
- }
-
- if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
- vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
- return false;
-
- return true;
-}
-
-static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
- struct sk_buff *skb)
-{
- int err = 0;
-
- if (vxlan_get_sk_family(vs) == AF_INET)
- err = IP_ECN_decapsulate(oiph, skb);
-#if IS_ENABLED(CONFIG_IPV6)
- else
- err = IP6_ECN_decapsulate(oiph, skb);
-#endif
-
- if (unlikely(err) && log_ecn_error) {
- if (vxlan_get_sk_family(vs) == AF_INET)
- net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
- &((struct iphdr *)oiph)->saddr,
- ((struct iphdr *)oiph)->tos);
- else
- net_info_ratelimited("non-ECT from %pI6\n",
- &((struct ipv6hdr *)oiph)->saddr);
- }
- return err <= 1;
-}
-
-/* Callback from net/ipv4/udp.c to receive packets */
-static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
-{
- struct vxlan_dev *vxlan;
- struct vxlan_sock *vs;
- struct vxlanhdr unparsed;
- struct vxlan_metadata _md;
- struct vxlan_metadata *md = &_md;
- __be16 protocol = htons(ETH_P_TEB);
- bool raw_proto = false;
- void *oiph;
- __be32 vni = 0;
-
- /* Need UDP and VXLAN header to be present */
- if (!pskb_may_pull(skb, VXLAN_HLEN))
- goto drop;
-
- unparsed = *vxlan_hdr(skb);
- /* VNI flag always required to be set */
- if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
- netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
- ntohl(vxlan_hdr(skb)->vx_flags),
- ntohl(vxlan_hdr(skb)->vx_vni));
- /* Return non vxlan pkt */
- goto drop;
- }
- unparsed.vx_flags &= ~VXLAN_HF_VNI;
- unparsed.vx_vni &= ~VXLAN_VNI_MASK;
-
- vs = rcu_dereference_sk_user_data(sk);
- if (!vs)
- goto drop;
-
- vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
-
- vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
- if (!vxlan)
- goto drop;
-
- /* For backwards compatibility, only allow reserved fields to be
- * used by VXLAN extensions if explicitly requested.
- */
- if (vs->flags & VXLAN_F_GPE) {
- if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
- goto drop;
- raw_proto = true;
- }
-
- if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
- !net_eq(vxlan->net, dev_net(vxlan->dev))))
- goto drop;
-
- if (vs->flags & VXLAN_F_REMCSUM_RX)
- if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
- goto drop;
-
- if (vxlan_collect_metadata(vs)) {
- struct metadata_dst *tun_dst;
-
- tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
- key32_to_tunnel_id(vni), sizeof(*md));
-
- if (!tun_dst)
- goto drop;
-
- md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
-
- skb_dst_set(skb, (struct dst_entry *)tun_dst);
- } else {
- memset(md, 0, sizeof(*md));
- }
-
- if (vs->flags & VXLAN_F_GBP)
- vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
- /* Note that GBP and GPE can never be active together. This is
- * ensured in vxlan_dev_configure.
- */
-
- if (unparsed.vx_flags || unparsed.vx_vni) {
- /* If there are any unprocessed flags remaining treat
- * this as a malformed packet. This behavior diverges from
- * VXLAN RFC (RFC7348) which stipulates that bits in reserved
- * in reserved fields are to be ignored. The approach here
- * maintains compatibility with previous stack code, and also
- * is more robust and provides a little more security in
- * adding extensions to VXLAN.
- */
- goto drop;
- }
-
- if (!raw_proto) {
- if (!vxlan_set_mac(vxlan, vs, skb, vni))
- goto drop;
- } else {
- skb_reset_mac_header(skb);
- skb->dev = vxlan->dev;
- skb->pkt_type = PACKET_HOST;
- }
-
- oiph = skb_network_header(skb);
- skb_reset_network_header(skb);
-
- if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
- ++vxlan->dev->stats.rx_frame_errors;
- ++vxlan->dev->stats.rx_errors;
- goto drop;
- }
-
- rcu_read_lock();
-
- if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
- rcu_read_unlock();
- atomic_long_inc(&vxlan->dev->rx_dropped);
- goto drop;
- }
-
- dev_sw_netstats_rx_add(vxlan->dev, skb->len);
- gro_cells_receive(&vxlan->gro_cells, skb);
-
- rcu_read_unlock();
-
- return 0;
-
-drop:
- /* Consume bad packet */
- kfree_skb(skb);
- return 0;
-}
-
-/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
-static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
-{
- struct vxlan_dev *vxlan;
- struct vxlan_sock *vs;
- struct vxlanhdr *hdr;
- __be32 vni;
-
- if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
- return -EINVAL;
-
- hdr = vxlan_hdr(skb);
-
- if (!(hdr->vx_flags & VXLAN_HF_VNI))
- return -EINVAL;
-
- vs = rcu_dereference_sk_user_data(sk);
- if (!vs)
- return -ENOENT;
-
- vni = vxlan_vni(hdr->vx_vni);
- vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
- if (!vxlan)
- return -ENOENT;
-
- return 0;
-}
-
-static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct arphdr *parp;
- u8 *arpptr, *sha;
- __be32 sip, tip;
- struct neighbour *n;
-
- if (dev->flags & IFF_NOARP)
- goto out;
-
- if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
- dev->stats.tx_dropped++;
- goto out;
- }
- parp = arp_hdr(skb);
-
- if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
- parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
- parp->ar_pro != htons(ETH_P_IP) ||
- parp->ar_op != htons(ARPOP_REQUEST) ||
- parp->ar_hln != dev->addr_len ||
- parp->ar_pln != 4)
- goto out;
- arpptr = (u8 *)parp + sizeof(struct arphdr);
- sha = arpptr;
- arpptr += dev->addr_len; /* sha */
- memcpy(&sip, arpptr, sizeof(sip));
- arpptr += sizeof(sip);
- arpptr += dev->addr_len; /* tha */
- memcpy(&tip, arpptr, sizeof(tip));
-
- if (ipv4_is_loopback(tip) ||
- ipv4_is_multicast(tip))
- goto out;
-
- n = neigh_lookup(&arp_tbl, &tip, dev);
-
- if (n) {
- struct vxlan_fdb *f;
- struct sk_buff *reply;
-
- if (!(n->nud_state & NUD_CONNECTED)) {
- neigh_release(n);
- goto out;
- }
-
- f = vxlan_find_mac(vxlan, n->ha, vni);
- if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
- /* bridge-local neighbor */
- neigh_release(n);
- goto out;
- }
-
- reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
- n->ha, sha);
-
- neigh_release(n);
-
- if (reply == NULL)
- goto out;
-
- skb_reset_mac_header(reply);
- __skb_pull(reply, skb_network_offset(reply));
- reply->ip_summed = CHECKSUM_UNNECESSARY;
- reply->pkt_type = PACKET_HOST;
-
- if (netif_rx_ni(reply) == NET_RX_DROP)
- dev->stats.rx_dropped++;
- } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
- union vxlan_addr ipa = {
- .sin.sin_addr.s_addr = tip,
- .sin.sin_family = AF_INET,
- };
-
- vxlan_ip_miss(dev, &ipa);
- }
-out:
- consume_skb(skb);
- return NETDEV_TX_OK;
-}
-
-#if IS_ENABLED(CONFIG_IPV6)
-static struct sk_buff *vxlan_na_create(struct sk_buff *request,
- struct neighbour *n, bool isrouter)
-{
- struct net_device *dev = request->dev;
- struct sk_buff *reply;
- struct nd_msg *ns, *na;
- struct ipv6hdr *pip6;
- u8 *daddr;
- int na_olen = 8; /* opt hdr + ETH_ALEN for target */
- int ns_olen;
- int i, len;
-
- if (dev == NULL || !pskb_may_pull(request, request->len))
- return NULL;
-
- len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
- sizeof(*na) + na_olen + dev->needed_tailroom;
- reply = alloc_skb(len, GFP_ATOMIC);
- if (reply == NULL)
- return NULL;
-
- reply->protocol = htons(ETH_P_IPV6);
- reply->dev = dev;
- skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
- skb_push(reply, sizeof(struct ethhdr));
- skb_reset_mac_header(reply);
-
- ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
-
- daddr = eth_hdr(request)->h_source;
- ns_olen = request->len - skb_network_offset(request) -
- sizeof(struct ipv6hdr) - sizeof(*ns);
- for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
- if (!ns->opt[i + 1]) {
- kfree_skb(reply);
- return NULL;
- }
- if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
- daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
- break;
- }
- }
-
- /* Ethernet header */
- ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
- ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
- eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
- reply->protocol = htons(ETH_P_IPV6);
-
- skb_pull(reply, sizeof(struct ethhdr));
- skb_reset_network_header(reply);
- skb_put(reply, sizeof(struct ipv6hdr));
-
- /* IPv6 header */
-
- pip6 = ipv6_hdr(reply);
- memset(pip6, 0, sizeof(struct ipv6hdr));
- pip6->version = 6;
- pip6->priority = ipv6_hdr(request)->priority;
- pip6->nexthdr = IPPROTO_ICMPV6;
- pip6->hop_limit = 255;
- pip6->daddr = ipv6_hdr(request)->saddr;
- pip6->saddr = *(struct in6_addr *)n->primary_key;
-
- skb_pull(reply, sizeof(struct ipv6hdr));
- skb_reset_transport_header(reply);
-
- /* Neighbor Advertisement */
- na = skb_put_zero(reply, sizeof(*na) + na_olen);
- na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
- na->icmph.icmp6_router = isrouter;
- na->icmph.icmp6_override = 1;
- na->icmph.icmp6_solicited = 1;
- na->target = ns->target;
- ether_addr_copy(&na->opt[2], n->ha);
- na->opt[0] = ND_OPT_TARGET_LL_ADDR;
- na->opt[1] = na_olen >> 3;
-
- na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
- &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
- csum_partial(na, sizeof(*na)+na_olen, 0));
-
- pip6->payload_len = htons(sizeof(*na)+na_olen);
-
- skb_push(reply, sizeof(struct ipv6hdr));
-
- reply->ip_summed = CHECKSUM_UNNECESSARY;
-
- return reply;
-}
-
-static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- const struct in6_addr *daddr;
- const struct ipv6hdr *iphdr;
- struct inet6_dev *in6_dev;
- struct neighbour *n;
- struct nd_msg *msg;
-
- rcu_read_lock();
- in6_dev = __in6_dev_get(dev);
- if (!in6_dev)
- goto out;
-
- iphdr = ipv6_hdr(skb);
- daddr = &iphdr->daddr;
- msg = (struct nd_msg *)(iphdr + 1);
-
- if (ipv6_addr_loopback(daddr) ||
- ipv6_addr_is_multicast(&msg->target))
- goto out;
-
- n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
-
- if (n) {
- struct vxlan_fdb *f;
- struct sk_buff *reply;
-
- if (!(n->nud_state & NUD_CONNECTED)) {
- neigh_release(n);
- goto out;
- }
-
- f = vxlan_find_mac(vxlan, n->ha, vni);
- if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
- /* bridge-local neighbor */
- neigh_release(n);
- goto out;
- }
-
- reply = vxlan_na_create(skb, n,
- !!(f ? f->flags & NTF_ROUTER : 0));
-
- neigh_release(n);
-
- if (reply == NULL)
- goto out;
-
- if (netif_rx_ni(reply) == NET_RX_DROP)
- dev->stats.rx_dropped++;
-
- } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
- union vxlan_addr ipa = {
- .sin6.sin6_addr = msg->target,
- .sin6.sin6_family = AF_INET6,
- };
-
- vxlan_ip_miss(dev, &ipa);
- }
-
-out:
- rcu_read_unlock();
- consume_skb(skb);
- return NETDEV_TX_OK;
-}
-#endif
-
-static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct neighbour *n;
-
- if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
- return false;
-
- n = NULL;
- switch (ntohs(eth_hdr(skb)->h_proto)) {
- case ETH_P_IP:
- {
- struct iphdr *pip;
-
- if (!pskb_may_pull(skb, sizeof(struct iphdr)))
- return false;
- pip = ip_hdr(skb);
- n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
- if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
- union vxlan_addr ipa = {
- .sin.sin_addr.s_addr = pip->daddr,
- .sin.sin_family = AF_INET,
- };
-
- vxlan_ip_miss(dev, &ipa);
- return false;
- }
-
- break;
- }
-#if IS_ENABLED(CONFIG_IPV6)
- case ETH_P_IPV6:
- {
- struct ipv6hdr *pip6;
-
- if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
- return false;
- pip6 = ipv6_hdr(skb);
- n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
- if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
- union vxlan_addr ipa = {
- .sin6.sin6_addr = pip6->daddr,
- .sin6.sin6_family = AF_INET6,
- };
-
- vxlan_ip_miss(dev, &ipa);
- return false;
- }
-
- break;
- }
-#endif
- default:
- return false;
- }
-
- if (n) {
- bool diff;
-
- diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
- if (diff) {
- memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
- dev->addr_len);
- memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
- }
- neigh_release(n);
- return diff;
- }
-
- return false;
-}
-
-static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
- struct vxlan_metadata *md)
-{
- struct vxlanhdr_gbp *gbp;
-
- if (!md->gbp)
- return;
-
- gbp = (struct vxlanhdr_gbp *)vxh;
- vxh->vx_flags |= VXLAN_HF_GBP;
-
- if (md->gbp & VXLAN_GBP_DONT_LEARN)
- gbp->dont_learn = 1;
-
- if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
- gbp->policy_applied = 1;
-
- gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
-}
-
-static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
- __be16 protocol)
-{
- struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
-
- gpe->np_applied = 1;
- gpe->next_protocol = tun_p_from_eth_p(protocol);
- if (!gpe->next_protocol)
- return -EPFNOSUPPORT;
- return 0;
-}
-
-static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
- int iphdr_len, __be32 vni,
- struct vxlan_metadata *md, u32 vxflags,
- bool udp_sum)
-{
- struct vxlanhdr *vxh;
- int min_headroom;
- int err;
- int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
- __be16 inner_protocol = htons(ETH_P_TEB);
-
- if ((vxflags & VXLAN_F_REMCSUM_TX) &&
- skb->ip_summed == CHECKSUM_PARTIAL) {
- int csum_start = skb_checksum_start_offset(skb);
-
- if (csum_start <= VXLAN_MAX_REMCSUM_START &&
- !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
- (skb->csum_offset == offsetof(struct udphdr, check) ||
- skb->csum_offset == offsetof(struct tcphdr, check)))
- type |= SKB_GSO_TUNNEL_REMCSUM;
- }
-
- min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
- + VXLAN_HLEN + iphdr_len;
-
- /* Need space for new headers (invalidates iph ptr) */
- err = skb_cow_head(skb, min_headroom);
- if (unlikely(err))
- return err;
-
- err = iptunnel_handle_offloads(skb, type);
- if (err)
- return err;
-
- vxh = __skb_push(skb, sizeof(*vxh));
- vxh->vx_flags = VXLAN_HF_VNI;
- vxh->vx_vni = vxlan_vni_field(vni);
-
- if (type & SKB_GSO_TUNNEL_REMCSUM) {
- unsigned int start;
-
- start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
- vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
- vxh->vx_flags |= VXLAN_HF_RCO;
-
- if (!skb_is_gso(skb)) {
- skb->ip_summed = CHECKSUM_NONE;
- skb->encapsulation = 0;
- }
- }
-
- if (vxflags & VXLAN_F_GBP)
- vxlan_build_gbp_hdr(vxh, vxflags, md);
- if (vxflags & VXLAN_F_GPE) {
- err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
- if (err < 0)
- return err;
- inner_protocol = skb->protocol;
- }
-
- skb_set_inner_protocol(skb, inner_protocol);
- return 0;
-}
-
-static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
- struct vxlan_sock *sock4,
- struct sk_buff *skb, int oif, u8 tos,
- __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
- struct dst_cache *dst_cache,
- const struct ip_tunnel_info *info)
-{
- bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
- struct rtable *rt = NULL;
- struct flowi4 fl4;
-
- if (!sock4)
- return ERR_PTR(-EIO);
-
- if (tos && !info)
- use_cache = false;
- if (use_cache) {
- rt = dst_cache_get_ip4(dst_cache, saddr);
- if (rt)
- return rt;
- }
-
- memset(&fl4, 0, sizeof(fl4));
- fl4.flowi4_oif = oif;
- fl4.flowi4_tos = RT_TOS(tos);
- fl4.flowi4_mark = skb->mark;
- fl4.flowi4_proto = IPPROTO_UDP;
- fl4.daddr = daddr;
- fl4.saddr = *saddr;
- fl4.fl4_dport = dport;
- fl4.fl4_sport = sport;
-
- rt = ip_route_output_key(vxlan->net, &fl4);
- if (!IS_ERR(rt)) {
- if (rt->dst.dev == dev) {
- netdev_dbg(dev, "circular route to %pI4\n", &daddr);
- ip_rt_put(rt);
- return ERR_PTR(-ELOOP);
- }
-
- *saddr = fl4.saddr;
- if (use_cache)
- dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
- } else {
- netdev_dbg(dev, "no route to %pI4\n", &daddr);
- return ERR_PTR(-ENETUNREACH);
- }
- return rt;
-}
-
-#if IS_ENABLED(CONFIG_IPV6)
-static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
- struct net_device *dev,
- struct vxlan_sock *sock6,
- struct sk_buff *skb, int oif, u8 tos,
- __be32 label,
- const struct in6_addr *daddr,
- struct in6_addr *saddr,
- __be16 dport, __be16 sport,
- struct dst_cache *dst_cache,
- const struct ip_tunnel_info *info)
-{
- bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
- struct dst_entry *ndst;
- struct flowi6 fl6;
-
- if (!sock6)
- return ERR_PTR(-EIO);
-
- if (tos && !info)
- use_cache = false;
- if (use_cache) {
- ndst = dst_cache_get_ip6(dst_cache, saddr);
- if (ndst)
- return ndst;
- }
-
- memset(&fl6, 0, sizeof(fl6));
- fl6.flowi6_oif = oif;
- fl6.daddr = *daddr;
- fl6.saddr = *saddr;
- fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
- fl6.flowi6_mark = skb->mark;
- fl6.flowi6_proto = IPPROTO_UDP;
- fl6.fl6_dport = dport;
- fl6.fl6_sport = sport;
-
- ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
- &fl6, NULL);
- if (IS_ERR(ndst)) {
- netdev_dbg(dev, "no route to %pI6\n", daddr);
- return ERR_PTR(-ENETUNREACH);
- }
-
- if (unlikely(ndst->dev == dev)) {
- netdev_dbg(dev, "circular route to %pI6\n", daddr);
- dst_release(ndst);
- return ERR_PTR(-ELOOP);
- }
-
- *saddr = fl6.saddr;
- if (use_cache)
- dst_cache_set_ip6(dst_cache, ndst, saddr);
- return ndst;
-}
-#endif
-
-/* Bypass encapsulation if the destination is local */
-static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
- struct vxlan_dev *dst_vxlan, __be32 vni,
- bool snoop)
-{
- struct pcpu_sw_netstats *tx_stats, *rx_stats;
- union vxlan_addr loopback;
- union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
- struct net_device *dev;
- int len = skb->len;
-
- tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
- rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
- skb->pkt_type = PACKET_HOST;
- skb->encapsulation = 0;
- skb->dev = dst_vxlan->dev;
- __skb_pull(skb, skb_network_offset(skb));
-
- if (remote_ip->sa.sa_family == AF_INET) {
- loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- loopback.sa.sa_family = AF_INET;
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- loopback.sin6.sin6_addr = in6addr_loopback;
- loopback.sa.sa_family = AF_INET6;
-#endif
- }
-
- rcu_read_lock();
- dev = skb->dev;
- if (unlikely(!(dev->flags & IFF_UP))) {
- kfree_skb(skb);
- goto drop;
- }
-
- if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
- vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
-
- u64_stats_update_begin(&tx_stats->syncp);
- tx_stats->tx_packets++;
- tx_stats->tx_bytes += len;
- u64_stats_update_end(&tx_stats->syncp);
-
- if (__netif_rx(skb) == NET_RX_SUCCESS) {
- u64_stats_update_begin(&rx_stats->syncp);
- rx_stats->rx_packets++;
- rx_stats->rx_bytes += len;
- u64_stats_update_end(&rx_stats->syncp);
- } else {
-drop:
- dev->stats.rx_dropped++;
- }
- rcu_read_unlock();
-}
-
-static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
- struct vxlan_dev *vxlan,
- union vxlan_addr *daddr,
- __be16 dst_port, int dst_ifindex, __be32 vni,
- struct dst_entry *dst,
- u32 rt_flags)
-{
-#if IS_ENABLED(CONFIG_IPV6)
- /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
- * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
- * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
- */
- BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
-#endif
- /* Bypass encapsulation if the destination is local */
- if (rt_flags & RTCF_LOCAL &&
- !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
- struct vxlan_dev *dst_vxlan;
-
- dst_release(dst);
- dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
- daddr->sa.sa_family, dst_port,
- vxlan->cfg.flags);
- if (!dst_vxlan) {
- dev->stats.tx_errors++;
- kfree_skb(skb);
-
- return -ENOENT;
- }
- vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
- return 1;
- }
-
- return 0;
-}
-
-static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
- __be32 default_vni, struct vxlan_rdst *rdst,
- bool did_rsc)
-{
- struct dst_cache *dst_cache;
- struct ip_tunnel_info *info;
- struct vxlan_dev *vxlan = netdev_priv(dev);
- const struct iphdr *old_iph = ip_hdr(skb);
- union vxlan_addr *dst;
- union vxlan_addr remote_ip, local_ip;
- struct vxlan_metadata _md;
- struct vxlan_metadata *md = &_md;
- __be16 src_port = 0, dst_port;
- struct dst_entry *ndst = NULL;
- __be32 vni, label;
- __u8 tos, ttl;
- int ifindex;
- int err;
- u32 flags = vxlan->cfg.flags;
- bool udp_sum = false;
- bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
-
- info = skb_tunnel_info(skb);
-
- if (rdst) {
- dst = &rdst->remote_ip;
- if (vxlan_addr_any(dst)) {
- if (did_rsc) {
- /* short-circuited back to local bridge */
- vxlan_encap_bypass(skb, vxlan, vxlan,
- default_vni, true);
- return;
- }
- goto drop;
- }
-
- dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
- vni = (rdst->remote_vni) ? : default_vni;
- ifindex = rdst->remote_ifindex;
- local_ip = vxlan->cfg.saddr;
- dst_cache = &rdst->dst_cache;
- md->gbp = skb->mark;
- if (flags & VXLAN_F_TTL_INHERIT) {
- ttl = ip_tunnel_get_ttl(old_iph, skb);
- } else {
- ttl = vxlan->cfg.ttl;
- if (!ttl && vxlan_addr_multicast(dst))
- ttl = 1;
- }
-
- tos = vxlan->cfg.tos;
- if (tos == 1)
- tos = ip_tunnel_get_dsfield(old_iph, skb);
-
- if (dst->sa.sa_family == AF_INET)
- udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
- else
- udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
- label = vxlan->cfg.label;
- } else {
- if (!info) {
- WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
- dev->name);
- goto drop;
- }
- remote_ip.sa.sa_family = ip_tunnel_info_af(info);
- if (remote_ip.sa.sa_family == AF_INET) {
- remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
- local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
- } else {
- remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
- local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
- }
- dst = &remote_ip;
- dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
- vni = tunnel_id_to_key32(info->key.tun_id);
- ifindex = 0;
- dst_cache = &info->dst_cache;
- if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
- if (info->options_len < sizeof(*md))
- goto drop;
- md = ip_tunnel_info_opts(info);
- }
- ttl = info->key.ttl;
- tos = info->key.tos;
- label = info->key.label;
- udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
- }
- src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
- vxlan->cfg.port_max, true);
-
- rcu_read_lock();
- if (dst->sa.sa_family == AF_INET) {
- struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
- struct rtable *rt;
- __be16 df = 0;
-
- if (!ifindex)
- ifindex = sock4->sock->sk->sk_bound_dev_if;
-
- rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
- dst->sin.sin_addr.s_addr,
- &local_ip.sin.sin_addr.s_addr,
- dst_port, src_port,
- dst_cache, info);
- if (IS_ERR(rt)) {
- err = PTR_ERR(rt);
- goto tx_error;
- }
-
- if (!info) {
- /* Bypass encapsulation if the destination is local */
- err = encap_bypass_if_local(skb, dev, vxlan, dst,
- dst_port, ifindex, vni,
- &rt->dst, rt->rt_flags);
- if (err)
- goto out_unlock;
-
- if (vxlan->cfg.df == VXLAN_DF_SET) {
- df = htons(IP_DF);
- } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
- struct ethhdr *eth = eth_hdr(skb);
-
- if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
- (ntohs(eth->h_proto) == ETH_P_IP &&
- old_iph->frag_off & htons(IP_DF)))
- df = htons(IP_DF);
- }
- } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
- df = htons(IP_DF);
- }
-
- ndst = &rt->dst;
- err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
- netif_is_any_bridge_port(dev));
- if (err < 0) {
- goto tx_error;
- } else if (err) {
- if (info) {
- struct ip_tunnel_info *unclone;
- struct in_addr src, dst;
-
- unclone = skb_tunnel_info_unclone(skb);
- if (unlikely(!unclone))
- goto tx_error;
-
- src = remote_ip.sin.sin_addr;
- dst = local_ip.sin.sin_addr;
- unclone->key.u.ipv4.src = src.s_addr;
- unclone->key.u.ipv4.dst = dst.s_addr;
- }
- vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
- dst_release(ndst);
- goto out_unlock;
- }
-
- tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
- ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
- err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
- vni, md, flags, udp_sum);
- if (err < 0)
- goto tx_error;
-
- udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
- dst->sin.sin_addr.s_addr, tos, ttl, df,
- src_port, dst_port, xnet, !udp_sum);
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
-
- if (!ifindex)
- ifindex = sock6->sock->sk->sk_bound_dev_if;
-
- ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
- label, &dst->sin6.sin6_addr,
- &local_ip.sin6.sin6_addr,
- dst_port, src_port,
- dst_cache, info);
- if (IS_ERR(ndst)) {
- err = PTR_ERR(ndst);
- ndst = NULL;
- goto tx_error;
- }
-
- if (!info) {
- u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
-
- err = encap_bypass_if_local(skb, dev, vxlan, dst,
- dst_port, ifindex, vni,
- ndst, rt6i_flags);
- if (err)
- goto out_unlock;
- }
-
- err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
- netif_is_any_bridge_port(dev));
- if (err < 0) {
- goto tx_error;
- } else if (err) {
- if (info) {
- struct ip_tunnel_info *unclone;
- struct in6_addr src, dst;
-
- unclone = skb_tunnel_info_unclone(skb);
- if (unlikely(!unclone))
- goto tx_error;
-
- src = remote_ip.sin6.sin6_addr;
- dst = local_ip.sin6.sin6_addr;
- unclone->key.u.ipv6.src = src;
- unclone->key.u.ipv6.dst = dst;
- }
-
- vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
- dst_release(ndst);
- goto out_unlock;
- }
-
- tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
- ttl = ttl ? : ip6_dst_hoplimit(ndst);
- skb_scrub_packet(skb, xnet);
- err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
- vni, md, flags, udp_sum);
- if (err < 0)
- goto tx_error;
-
- udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
- &local_ip.sin6.sin6_addr,
- &dst->sin6.sin6_addr, tos, ttl,
- label, src_port, dst_port, !udp_sum);
-#endif
- }
-out_unlock:
- rcu_read_unlock();
- return;
-
-drop:
- dev->stats.tx_dropped++;
- dev_kfree_skb(skb);
- return;
-
-tx_error:
- rcu_read_unlock();
- if (err == -ELOOP)
- dev->stats.collisions++;
- else if (err == -ENETUNREACH)
- dev->stats.tx_carrier_errors++;
- dst_release(ndst);
- dev->stats.tx_errors++;
- kfree_skb(skb);
-}
-
-static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
- struct vxlan_fdb *f, __be32 vni, bool did_rsc)
-{
- struct vxlan_rdst nh_rdst;
- struct nexthop *nh;
- bool do_xmit;
- u32 hash;
-
- memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
- hash = skb_get_hash(skb);
-
- rcu_read_lock();
- nh = rcu_dereference(f->nh);
- if (!nh) {
- rcu_read_unlock();
- goto drop;
- }
- do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
- rcu_read_unlock();
-
- if (likely(do_xmit))
- vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
- else
- goto drop;
-
- return;
-
-drop:
- dev->stats.tx_dropped++;
- dev_kfree_skb(skb);
-}
-
-/* Transmit local packets over Vxlan
- *
- * Outer IP header inherits ECN and DF from inner header.
- * Outer UDP destination is the VXLAN assigned port.
- * source port is based on hash of flow
- */
-static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_rdst *rdst, *fdst = NULL;
- const struct ip_tunnel_info *info;
- bool did_rsc = false;
- struct vxlan_fdb *f;
- struct ethhdr *eth;
- __be32 vni = 0;
-
- info = skb_tunnel_info(skb);
-
- skb_reset_mac_header(skb);
-
- if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
- if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
- info->mode & IP_TUNNEL_INFO_TX) {
- vni = tunnel_id_to_key32(info->key.tun_id);
- } else {
- if (info && info->mode & IP_TUNNEL_INFO_TX)
- vxlan_xmit_one(skb, dev, vni, NULL, false);
- else
- kfree_skb(skb);
- return NETDEV_TX_OK;
- }
- }
-
- if (vxlan->cfg.flags & VXLAN_F_PROXY) {
- eth = eth_hdr(skb);
- if (ntohs(eth->h_proto) == ETH_P_ARP)
- return arp_reduce(dev, skb, vni);
-#if IS_ENABLED(CONFIG_IPV6)
- else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
- pskb_may_pull(skb, sizeof(struct ipv6hdr) +
- sizeof(struct nd_msg)) &&
- ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
- struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
-
- if (m->icmph.icmp6_code == 0 &&
- m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
- return neigh_reduce(dev, skb, vni);
- }
-#endif
- }
-
- eth = eth_hdr(skb);
- f = vxlan_find_mac(vxlan, eth->h_dest, vni);
- did_rsc = false;
-
- if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
- (ntohs(eth->h_proto) == ETH_P_IP ||
- ntohs(eth->h_proto) == ETH_P_IPV6)) {
- did_rsc = route_shortcircuit(dev, skb);
- if (did_rsc)
- f = vxlan_find_mac(vxlan, eth->h_dest, vni);
- }
-
- if (f == NULL) {
- f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
- if (f == NULL) {
- if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
- !is_multicast_ether_addr(eth->h_dest))
- vxlan_fdb_miss(vxlan, eth->h_dest);
-
- dev->stats.tx_dropped++;
- kfree_skb(skb);
- return NETDEV_TX_OK;
- }
- }
-
- if (rcu_access_pointer(f->nh)) {
- vxlan_xmit_nh(skb, dev, f,
- (vni ? : vxlan->default_dst.remote_vni), did_rsc);
- } else {
- list_for_each_entry_rcu(rdst, &f->remotes, list) {
- struct sk_buff *skb1;
-
- if (!fdst) {
- fdst = rdst;
- continue;
- }
- skb1 = skb_clone(skb, GFP_ATOMIC);
- if (skb1)
- vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
- }
- if (fdst)
- vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
- else
- kfree_skb(skb);
- }
-
- return NETDEV_TX_OK;
-}
-
-/* Walk the forwarding table and purge stale entries */
-static void vxlan_cleanup(struct timer_list *t)
-{
- struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
- unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
- unsigned int h;
-
- if (!netif_running(vxlan->dev))
- return;
-
- for (h = 0; h < FDB_HASH_SIZE; ++h) {
- struct hlist_node *p, *n;
-
- spin_lock(&vxlan->hash_lock[h]);
- hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
- struct vxlan_fdb *f
- = container_of(p, struct vxlan_fdb, hlist);
- unsigned long timeout;
-
- if (f->state & (NUD_PERMANENT | NUD_NOARP))
- continue;
-
- if (f->flags & NTF_EXT_LEARNED)
- continue;
-
- timeout = f->used + vxlan->cfg.age_interval * HZ;
- if (time_before_eq(timeout, jiffies)) {
- netdev_dbg(vxlan->dev,
- "garbage collect %pM\n",
- f->eth_addr);
- f->state = NUD_STALE;
- vxlan_fdb_destroy(vxlan, f, true, true);
- } else if (time_before(timeout, next_timer))
- next_timer = timeout;
- }
- spin_unlock(&vxlan->hash_lock[h]);
- }
-
- mod_timer(&vxlan->age_timer, next_timer);
-}
-
-static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
-{
- struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
-
- spin_lock(&vn->sock_lock);
- hlist_del_init_rcu(&vxlan->hlist4.hlist);
-#if IS_ENABLED(CONFIG_IPV6)
- hlist_del_init_rcu(&vxlan->hlist6.hlist);
-#endif
- spin_unlock(&vn->sock_lock);
-}
-
-static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
- struct vxlan_dev_node *node)
-{
- struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
- __be32 vni = vxlan->default_dst.remote_vni;
-
- node->vxlan = vxlan;
- spin_lock(&vn->sock_lock);
- hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
- spin_unlock(&vn->sock_lock);
-}
-
-/* Setup stats when device is created */
-static int vxlan_init(struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- int err;
-
- dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
- if (!dev->tstats)
- return -ENOMEM;
-
- err = gro_cells_init(&vxlan->gro_cells, dev);
- if (err) {
- free_percpu(dev->tstats);
- return err;
- }
-
- return 0;
-}
-
-static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
-{
- struct vxlan_fdb *f;
- u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
-
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
- f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
- if (f)
- vxlan_fdb_destroy(vxlan, f, true, true);
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
-}
-
-static void vxlan_uninit(struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
-
- gro_cells_destroy(&vxlan->gro_cells);
-
- vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
-
- free_percpu(dev->tstats);
-}
-
-/* Start ageing timer and join group when device is brought up */
-static int vxlan_open(struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- int ret;
-
- ret = vxlan_sock_add(vxlan);
- if (ret < 0)
- return ret;
-
- if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
- ret = vxlan_igmp_join(vxlan);
- if (ret == -EADDRINUSE)
- ret = 0;
- if (ret) {
- vxlan_sock_release(vxlan);
- return ret;
- }
- }
-
- if (vxlan->cfg.age_interval)
- mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
-
- return ret;
-}
-
-/* Purge the forwarding table */
-static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
-{
- unsigned int h;
-
- for (h = 0; h < FDB_HASH_SIZE; ++h) {
- struct hlist_node *p, *n;
-
- spin_lock_bh(&vxlan->hash_lock[h]);
- hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
- struct vxlan_fdb *f
- = container_of(p, struct vxlan_fdb, hlist);
- if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
- continue;
- /* the all_zeros_mac entry is deleted at vxlan_uninit */
- if (is_zero_ether_addr(f->eth_addr) &&
- f->vni == vxlan->cfg.vni)
- continue;
- vxlan_fdb_destroy(vxlan, f, true, true);
- }
- spin_unlock_bh(&vxlan->hash_lock[h]);
- }
-}
-
-/* Cleanup timer and forwarding table on shutdown */
-static int vxlan_stop(struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
- int ret = 0;
-
- if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
- !vxlan_group_used(vn, vxlan))
- ret = vxlan_igmp_leave(vxlan);
-
- del_timer_sync(&vxlan->age_timer);
-
- vxlan_flush(vxlan, false);
- vxlan_sock_release(vxlan);
-
- return ret;
-}
-
-/* Stub, nothing needs to be done. */
-static void vxlan_set_multicast_list(struct net_device *dev)
-{
-}
-
-static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_rdst *dst = &vxlan->default_dst;
- struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
- dst->remote_ifindex);
- bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
-
- /* This check is different than dev->max_mtu, because it looks at
- * the lowerdev->mtu, rather than the static dev->max_mtu
- */
- if (lowerdev) {
- int max_mtu = lowerdev->mtu -
- (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
- if (new_mtu > max_mtu)
- return -EINVAL;
- }
-
- dev->mtu = new_mtu;
- return 0;
-}
-
-static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct ip_tunnel_info *info = skb_tunnel_info(skb);
- __be16 sport, dport;
-
- sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
- vxlan->cfg.port_max, true);
- dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
-
- if (ip_tunnel_info_af(info) == AF_INET) {
- struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
- struct rtable *rt;
-
- rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
- info->key.u.ipv4.dst,
- &info->key.u.ipv4.src, dport, sport,
- &info->dst_cache, info);
- if (IS_ERR(rt))
- return PTR_ERR(rt);
- ip_rt_put(rt);
- } else {
-#if IS_ENABLED(CONFIG_IPV6)
- struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
- struct dst_entry *ndst;
-
- ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
- info->key.label, &info->key.u.ipv6.dst,
- &info->key.u.ipv6.src, dport, sport,
- &info->dst_cache, info);
- if (IS_ERR(ndst))
- return PTR_ERR(ndst);
- dst_release(ndst);
-#else /* !CONFIG_IPV6 */
- return -EPFNOSUPPORT;
-#endif
- }
- info->key.tp_src = sport;
- info->key.tp_dst = dport;
- return 0;
-}
-
-static const struct net_device_ops vxlan_netdev_ether_ops = {
- .ndo_init = vxlan_init,
- .ndo_uninit = vxlan_uninit,
- .ndo_open = vxlan_open,
- .ndo_stop = vxlan_stop,
- .ndo_start_xmit = vxlan_xmit,
- .ndo_get_stats64 = dev_get_tstats64,
- .ndo_set_rx_mode = vxlan_set_multicast_list,
- .ndo_change_mtu = vxlan_change_mtu,
- .ndo_validate_addr = eth_validate_addr,
- .ndo_set_mac_address = eth_mac_addr,
- .ndo_fdb_add = vxlan_fdb_add,
- .ndo_fdb_del = vxlan_fdb_delete,
- .ndo_fdb_dump = vxlan_fdb_dump,
- .ndo_fdb_get = vxlan_fdb_get,
- .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
-};
-
-static const struct net_device_ops vxlan_netdev_raw_ops = {
- .ndo_init = vxlan_init,
- .ndo_uninit = vxlan_uninit,
- .ndo_open = vxlan_open,
- .ndo_stop = vxlan_stop,
- .ndo_start_xmit = vxlan_xmit,
- .ndo_get_stats64 = dev_get_tstats64,
- .ndo_change_mtu = vxlan_change_mtu,
- .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
-};
-
-/* Info for udev, that this is a virtual tunnel endpoint */
-static struct device_type vxlan_type = {
- .name = "vxlan",
-};
-
-/* Calls the ndo_udp_tunnel_add of the caller in order to
- * supply the listening VXLAN udp ports. Callers are expected
- * to implement the ndo_udp_tunnel_add.
- */
-static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
-{
- struct vxlan_sock *vs;
- struct net *net = dev_net(dev);
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
- unsigned int i;
-
- spin_lock(&vn->sock_lock);
- for (i = 0; i < PORT_HASH_SIZE; ++i) {
- hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
- unsigned short type;
-
- if (vs->flags & VXLAN_F_GPE)
- type = UDP_TUNNEL_TYPE_VXLAN_GPE;
- else
- type = UDP_TUNNEL_TYPE_VXLAN;
-
- if (push)
- udp_tunnel_push_rx_port(dev, vs->sock, type);
- else
- udp_tunnel_drop_rx_port(dev, vs->sock, type);
- }
- }
- spin_unlock(&vn->sock_lock);
-}
-
-/* Initialize the device structure. */
-static void vxlan_setup(struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- unsigned int h;
-
- eth_hw_addr_random(dev);
- ether_setup(dev);
-
- dev->needs_free_netdev = true;
- SET_NETDEV_DEVTYPE(dev, &vxlan_type);
-
- dev->features |= NETIF_F_LLTX;
- dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
- dev->features |= NETIF_F_RXCSUM;
- dev->features |= NETIF_F_GSO_SOFTWARE;
-
- dev->vlan_features = dev->features;
- dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
- dev->hw_features |= NETIF_F_RXCSUM;
- dev->hw_features |= NETIF_F_GSO_SOFTWARE;
- netif_keep_dst(dev);
- dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
-
- /* MTU range: 68 - 65535 */
- dev->min_mtu = ETH_MIN_MTU;
- dev->max_mtu = ETH_MAX_MTU;
-
- INIT_LIST_HEAD(&vxlan->next);
-
- timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
-
- vxlan->dev = dev;
-
- for (h = 0; h < FDB_HASH_SIZE; ++h) {
- spin_lock_init(&vxlan->hash_lock[h]);
- INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
- }
-}
-
-static void vxlan_ether_setup(struct net_device *dev)
-{
- dev->priv_flags &= ~IFF_TX_SKB_SHARING;
- dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
- dev->netdev_ops = &vxlan_netdev_ether_ops;
-}
-
-static void vxlan_raw_setup(struct net_device *dev)
-{
- dev->header_ops = NULL;
- dev->type = ARPHRD_NONE;
- dev->hard_header_len = 0;
- dev->addr_len = 0;
- dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
- dev->netdev_ops = &vxlan_netdev_raw_ops;
-}
-
-static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
- [IFLA_VXLAN_ID] = { .type = NLA_U32 },
- [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
- [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
- [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
- [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
- [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
- [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
- [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
- [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
- [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
- [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
- [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
- [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
- [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
- [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
- [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
- [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
- [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
- [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
- [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
- [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
- [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
- [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
- [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
- [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
- [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
- [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
- [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
- [IFLA_VXLAN_DF] = { .type = NLA_U8 },
-};
-
-static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
- struct netlink_ext_ack *extack)
-{
- if (tb[IFLA_ADDRESS]) {
- if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
- "Provided link layer address is not Ethernet");
- return -EINVAL;
- }
-
- if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
- "Provided Ethernet address is not unicast");
- return -EADDRNOTAVAIL;
- }
- }
-
- if (tb[IFLA_MTU]) {
- u32 mtu = nla_get_u32(tb[IFLA_MTU]);
-
- if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
- "MTU must be between 68 and 65535");
- return -EINVAL;
- }
- }
-
- if (!data) {
- NL_SET_ERR_MSG(extack,
- "Required attributes not provided to perform the operation");
- return -EINVAL;
- }
-
- if (data[IFLA_VXLAN_ID]) {
- u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
-
- if (id >= VXLAN_N_VID) {
- NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
- "VXLAN ID must be lower than 16777216");
- return -ERANGE;
- }
- }
-
- if (data[IFLA_VXLAN_PORT_RANGE]) {
- const struct ifla_vxlan_port_range *p
- = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
-
- if (ntohs(p->high) < ntohs(p->low)) {
- NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
- "Invalid source port range");
- return -EINVAL;
- }
- }
-
- if (data[IFLA_VXLAN_DF]) {
- enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
-
- if (df < 0 || df > VXLAN_DF_MAX) {
- NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
- "Invalid DF attribute");
- return -EINVAL;
- }
- }
-
- return 0;
-}
-
-static void vxlan_get_drvinfo(struct net_device *netdev,
- struct ethtool_drvinfo *drvinfo)
-{
- strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
- strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
-}
-
-static int vxlan_get_link_ksettings(struct net_device *dev,
- struct ethtool_link_ksettings *cmd)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_rdst *dst = &vxlan->default_dst;
- struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
- dst->remote_ifindex);
-
- if (!lowerdev) {
- cmd->base.duplex = DUPLEX_UNKNOWN;
- cmd->base.port = PORT_OTHER;
- cmd->base.speed = SPEED_UNKNOWN;
-
- return 0;
- }
-
- return __ethtool_get_link_ksettings(lowerdev, cmd);
-}
-
-static const struct ethtool_ops vxlan_ethtool_ops = {
- .get_drvinfo = vxlan_get_drvinfo,
- .get_link = ethtool_op_get_link,
- .get_link_ksettings = vxlan_get_link_ksettings,
-};
-
-static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
- __be16 port, u32 flags, int ifindex)
-{
- struct socket *sock;
- struct udp_port_cfg udp_conf;
- int err;
-
- memset(&udp_conf, 0, sizeof(udp_conf));
-
- if (ipv6) {
- udp_conf.family = AF_INET6;
- udp_conf.use_udp6_rx_checksums =
- !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
- udp_conf.ipv6_v6only = 1;
- } else {
- udp_conf.family = AF_INET;
- }
-
- udp_conf.local_udp_port = port;
- udp_conf.bind_ifindex = ifindex;
-
- /* Open UDP socket */
- err = udp_sock_create(net, &udp_conf, &sock);
- if (err < 0)
- return ERR_PTR(err);
-
- udp_allow_gso(sock->sk);
- return sock;
-}
-
-/* Create new listen socket if needed */
-static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
- __be16 port, u32 flags,
- int ifindex)
-{
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
- struct vxlan_sock *vs;
- struct socket *sock;
- unsigned int h;
- struct udp_tunnel_sock_cfg tunnel_cfg;
-
- vs = kzalloc(sizeof(*vs), GFP_KERNEL);
- if (!vs)
- return ERR_PTR(-ENOMEM);
-
- for (h = 0; h < VNI_HASH_SIZE; ++h)
- INIT_HLIST_HEAD(&vs->vni_list[h]);
-
- sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
- if (IS_ERR(sock)) {
- kfree(vs);
- return ERR_CAST(sock);
- }
-
- vs->sock = sock;
- refcount_set(&vs->refcnt, 1);
- vs->flags = (flags & VXLAN_F_RCV_FLAGS);
-
- spin_lock(&vn->sock_lock);
- hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
- udp_tunnel_notify_add_rx_port(sock,
- (vs->flags & VXLAN_F_GPE) ?
- UDP_TUNNEL_TYPE_VXLAN_GPE :
- UDP_TUNNEL_TYPE_VXLAN);
- spin_unlock(&vn->sock_lock);
-
- /* Mark socket as an encapsulation socket. */
- memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
- tunnel_cfg.sk_user_data = vs;
- tunnel_cfg.encap_type = 1;
- tunnel_cfg.encap_rcv = vxlan_rcv;
- tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
- tunnel_cfg.encap_destroy = NULL;
- tunnel_cfg.gro_receive = vxlan_gro_receive;
- tunnel_cfg.gro_complete = vxlan_gro_complete;
-
- setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
-
- return vs;
-}
-
-static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
-{
- struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
- struct vxlan_sock *vs = NULL;
- struct vxlan_dev_node *node;
- int l3mdev_index = 0;
-
- if (vxlan->cfg.remote_ifindex)
- l3mdev_index = l3mdev_master_upper_ifindex_by_index(
- vxlan->net, vxlan->cfg.remote_ifindex);
-
- if (!vxlan->cfg.no_share) {
- spin_lock(&vn->sock_lock);
- vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
- vxlan->cfg.dst_port, vxlan->cfg.flags,
- l3mdev_index);
- if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
- spin_unlock(&vn->sock_lock);
- return -EBUSY;
- }
- spin_unlock(&vn->sock_lock);
- }
- if (!vs)
- vs = vxlan_socket_create(vxlan->net, ipv6,
- vxlan->cfg.dst_port, vxlan->cfg.flags,
- l3mdev_index);
- if (IS_ERR(vs))
- return PTR_ERR(vs);
-#if IS_ENABLED(CONFIG_IPV6)
- if (ipv6) {
- rcu_assign_pointer(vxlan->vn6_sock, vs);
- node = &vxlan->hlist6;
- } else
-#endif
- {
- rcu_assign_pointer(vxlan->vn4_sock, vs);
- node = &vxlan->hlist4;
- }
- vxlan_vs_add_dev(vs, vxlan, node);
- return 0;
-}
-
-static int vxlan_sock_add(struct vxlan_dev *vxlan)
-{
- bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
- bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
- bool ipv4 = !ipv6 || metadata;
- int ret = 0;
-
- RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
-#if IS_ENABLED(CONFIG_IPV6)
- RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
- if (ipv6) {
- ret = __vxlan_sock_add(vxlan, true);
- if (ret < 0 && ret != -EAFNOSUPPORT)
- ipv4 = false;
- }
-#endif
- if (ipv4)
- ret = __vxlan_sock_add(vxlan, false);
- if (ret < 0)
- vxlan_sock_release(vxlan);
- return ret;
-}
-
-static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
- struct net_device **lower,
- struct vxlan_dev *old,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
- struct vxlan_dev *tmp;
- bool use_ipv6 = false;
-
- if (conf->flags & VXLAN_F_GPE) {
- /* For now, allow GPE only together with
- * COLLECT_METADATA. This can be relaxed later; in such
- * case, the other side of the PtP link will have to be
- * provided.
- */
- if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
- !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
- NL_SET_ERR_MSG(extack,
- "VXLAN GPE does not support this combination of attributes");
- return -EINVAL;
- }
- }
-
- if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
- /* Unless IPv6 is explicitly requested, assume IPv4 */
- conf->remote_ip.sa.sa_family = AF_INET;
- conf->saddr.sa.sa_family = AF_INET;
- } else if (!conf->remote_ip.sa.sa_family) {
- conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
- } else if (!conf->saddr.sa.sa_family) {
- conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
- }
-
- if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
- NL_SET_ERR_MSG(extack,
- "Local and remote address must be from the same family");
- return -EINVAL;
- }
-
- if (vxlan_addr_multicast(&conf->saddr)) {
- NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
- return -EINVAL;
- }
-
- if (conf->saddr.sa.sa_family == AF_INET6) {
- if (!IS_ENABLED(CONFIG_IPV6)) {
- NL_SET_ERR_MSG(extack,
- "IPv6 support not enabled in the kernel");
- return -EPFNOSUPPORT;
- }
- use_ipv6 = true;
- conf->flags |= VXLAN_F_IPV6;
-
- if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
- int local_type =
- ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
- int remote_type =
- ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
-
- if (local_type & IPV6_ADDR_LINKLOCAL) {
- if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
- (remote_type != IPV6_ADDR_ANY)) {
- NL_SET_ERR_MSG(extack,
- "Invalid combination of local and remote address scopes");
- return -EINVAL;
- }
-
- conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
- } else {
- if (remote_type ==
- (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
- NL_SET_ERR_MSG(extack,
- "Invalid combination of local and remote address scopes");
- return -EINVAL;
- }
-
- conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
- }
- }
- }
-
- if (conf->label && !use_ipv6) {
- NL_SET_ERR_MSG(extack,
- "Label attribute only applies to IPv6 VXLAN devices");
- return -EINVAL;
- }
-
- if (conf->remote_ifindex) {
- struct net_device *lowerdev;
-
- lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
- if (!lowerdev) {
- NL_SET_ERR_MSG(extack,
- "Invalid local interface, device not found");
- return -ENODEV;
- }
-
-#if IS_ENABLED(CONFIG_IPV6)
- if (use_ipv6) {
- struct inet6_dev *idev = __in6_dev_get(lowerdev);
-
- if (idev && idev->cnf.disable_ipv6) {
- NL_SET_ERR_MSG(extack,
- "IPv6 support disabled by administrator");
- return -EPERM;
- }
- }
-#endif
-
- *lower = lowerdev;
- } else {
- if (vxlan_addr_multicast(&conf->remote_ip)) {
- NL_SET_ERR_MSG(extack,
- "Local interface required for multicast remote destination");
-
- return -EINVAL;
- }
-
-#if IS_ENABLED(CONFIG_IPV6)
- if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
- NL_SET_ERR_MSG(extack,
- "Local interface required for link-local local/remote addresses");
- return -EINVAL;
- }
-#endif
-
- *lower = NULL;
- }
-
- if (!conf->dst_port) {
- if (conf->flags & VXLAN_F_GPE)
- conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
- else
- conf->dst_port = htons(vxlan_port);
- }
-
- if (!conf->age_interval)
- conf->age_interval = FDB_AGE_DEFAULT;
-
- list_for_each_entry(tmp, &vn->vxlan_list, next) {
- if (tmp == old)
- continue;
-
- if (tmp->cfg.vni != conf->vni)
- continue;
- if (tmp->cfg.dst_port != conf->dst_port)
- continue;
- if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
- (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
- continue;
-
- if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
- tmp->cfg.remote_ifindex != conf->remote_ifindex)
- continue;
-
- NL_SET_ERR_MSG(extack,
- "A VXLAN device with the specified VNI already exists");
- return -EEXIST;
- }
-
- return 0;
-}
-
-static void vxlan_config_apply(struct net_device *dev,
- struct vxlan_config *conf,
- struct net_device *lowerdev,
- struct net *src_net,
- bool changelink)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_rdst *dst = &vxlan->default_dst;
- unsigned short needed_headroom = ETH_HLEN;
- bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
- int max_mtu = ETH_MAX_MTU;
-
- if (!changelink) {
- if (conf->flags & VXLAN_F_GPE)
- vxlan_raw_setup(dev);
- else
- vxlan_ether_setup(dev);
-
- if (conf->mtu)
- dev->mtu = conf->mtu;
-
- vxlan->net = src_net;
- }
-
- dst->remote_vni = conf->vni;
-
- memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
-
- if (lowerdev) {
- dst->remote_ifindex = conf->remote_ifindex;
-
- netif_set_gso_max_size(dev, lowerdev->gso_max_size);
- netif_set_gso_max_segs(dev, lowerdev->gso_max_segs);
-
- needed_headroom = lowerdev->hard_header_len;
- needed_headroom += lowerdev->needed_headroom;
-
- dev->needed_tailroom = lowerdev->needed_tailroom;
-
- max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
- VXLAN_HEADROOM);
- if (max_mtu < ETH_MIN_MTU)
- max_mtu = ETH_MIN_MTU;
-
- if (!changelink && !conf->mtu)
- dev->mtu = max_mtu;
- }
-
- if (dev->mtu > max_mtu)
- dev->mtu = max_mtu;
-
- if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
- needed_headroom += VXLAN6_HEADROOM;
- else
- needed_headroom += VXLAN_HEADROOM;
- dev->needed_headroom = needed_headroom;
-
- memcpy(&vxlan->cfg, conf, sizeof(*conf));
-}
-
-static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
- struct vxlan_config *conf, bool changelink,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct net_device *lowerdev;
- int ret;
-
- ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
- if (ret)
- return ret;
-
- vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
-
- return 0;
-}
-
-static int __vxlan_dev_create(struct net *net, struct net_device *dev,
- struct vxlan_config *conf,
- struct netlink_ext_ack *extack)
-{
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct net_device *remote_dev = NULL;
- struct vxlan_fdb *f = NULL;
- bool unregister = false;
- struct vxlan_rdst *dst;
- int err;
-
- dst = &vxlan->default_dst;
- err = vxlan_dev_configure(net, dev, conf, false, extack);
- if (err)
- return err;
-
- dev->ethtool_ops = &vxlan_ethtool_ops;
-
- /* create an fdb entry for a valid default destination */
- if (!vxlan_addr_any(&dst->remote_ip)) {
- err = vxlan_fdb_create(vxlan, all_zeros_mac,
- &dst->remote_ip,
- NUD_REACHABLE | NUD_PERMANENT,
- vxlan->cfg.dst_port,
- dst->remote_vni,
- dst->remote_vni,
- dst->remote_ifindex,
- NTF_SELF, 0, &f, extack);
- if (err)
- return err;
- }
-
- err = register_netdevice(dev);
- if (err)
- goto errout;
- unregister = true;
-
- if (dst->remote_ifindex) {
- remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
- if (!remote_dev) {
- err = -ENODEV;
- goto errout;
- }
-
- err = netdev_upper_dev_link(remote_dev, dev, extack);
- if (err)
- goto errout;
- }
-
- err = rtnl_configure_link(dev, NULL);
- if (err < 0)
- goto unlink;
-
- if (f) {
- vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
-
- /* notify default fdb entry */
- err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
- RTM_NEWNEIGH, true, extack);
- if (err) {
- vxlan_fdb_destroy(vxlan, f, false, false);
- if (remote_dev)
- netdev_upper_dev_unlink(remote_dev, dev);
- goto unregister;
- }
- }
-
- list_add(&vxlan->next, &vn->vxlan_list);
- if (remote_dev)
- dst->remote_dev = remote_dev;
- return 0;
-unlink:
- if (remote_dev)
- netdev_upper_dev_unlink(remote_dev, dev);
-errout:
- /* unregister_netdevice() destroys the default FDB entry with deletion
- * notification. But the addition notification was not sent yet, so
- * destroy the entry by hand here.
- */
- if (f)
- __vxlan_fdb_free(f);
-unregister:
- if (unregister)
- unregister_netdevice(dev);
- return err;
-}
-
-/* Set/clear flags based on attribute */
-static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
- int attrtype, unsigned long mask, bool changelink,
- bool changelink_supported,
- struct netlink_ext_ack *extack)
-{
- unsigned long flags;
-
- if (!tb[attrtype])
- return 0;
-
- if (changelink && !changelink_supported) {
- vxlan_flag_attr_error(attrtype, extack);
- return -EOPNOTSUPP;
- }
-
- if (vxlan_policy[attrtype].type == NLA_FLAG)
- flags = conf->flags | mask;
- else if (nla_get_u8(tb[attrtype]))
- flags = conf->flags | mask;
- else
- flags = conf->flags & ~mask;
-
- conf->flags = flags;
-
- return 0;
-}
-
-static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
- struct net_device *dev, struct vxlan_config *conf,
- bool changelink, struct netlink_ext_ack *extack)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- int err = 0;
-
- memset(conf, 0, sizeof(*conf));
-
- /* if changelink operation, start with old existing cfg */
- if (changelink)
- memcpy(conf, &vxlan->cfg, sizeof(*conf));
-
- if (data[IFLA_VXLAN_ID]) {
- __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
-
- if (changelink && (vni != conf->vni)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
- return -EOPNOTSUPP;
- }
- conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
- }
-
- if (data[IFLA_VXLAN_GROUP]) {
- if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
- return -EOPNOTSUPP;
- }
-
- conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
- conf->remote_ip.sa.sa_family = AF_INET;
- } else if (data[IFLA_VXLAN_GROUP6]) {
- if (!IS_ENABLED(CONFIG_IPV6)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
- return -EPFNOSUPPORT;
- }
-
- if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
- return -EOPNOTSUPP;
- }
-
- conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
- conf->remote_ip.sa.sa_family = AF_INET6;
- }
-
- if (data[IFLA_VXLAN_LOCAL]) {
- if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
- return -EOPNOTSUPP;
- }
-
- conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
- conf->saddr.sa.sa_family = AF_INET;
- } else if (data[IFLA_VXLAN_LOCAL6]) {
- if (!IS_ENABLED(CONFIG_IPV6)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
- return -EPFNOSUPPORT;
- }
-
- if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
- return -EOPNOTSUPP;
- }
-
- /* TODO: respect scope id */
- conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
- conf->saddr.sa.sa_family = AF_INET6;
- }
-
- if (data[IFLA_VXLAN_LINK])
- conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
-
- if (data[IFLA_VXLAN_TOS])
- conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
-
- if (data[IFLA_VXLAN_TTL])
- conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
-
- if (data[IFLA_VXLAN_TTL_INHERIT]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
- VXLAN_F_TTL_INHERIT, changelink, false,
- extack);
- if (err)
- return err;
-
- }
-
- if (data[IFLA_VXLAN_LABEL])
- conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
- IPV6_FLOWLABEL_MASK;
-
- if (data[IFLA_VXLAN_LEARNING]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
- VXLAN_F_LEARN, changelink, true,
- extack);
- if (err)
- return err;
- } else if (!changelink) {
- /* default to learn on a new device */
- conf->flags |= VXLAN_F_LEARN;
- }
-
- if (data[IFLA_VXLAN_AGEING])
- conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
-
- if (data[IFLA_VXLAN_PROXY]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
- VXLAN_F_PROXY, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_RSC]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
- VXLAN_F_RSC, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_L2MISS]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
- VXLAN_F_L2MISS, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_L3MISS]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
- VXLAN_F_L3MISS, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_LIMIT]) {
- if (changelink) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
- "Cannot change limit");
- return -EOPNOTSUPP;
- }
- conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
- }
-
- if (data[IFLA_VXLAN_COLLECT_METADATA]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
- VXLAN_F_COLLECT_METADATA, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_PORT_RANGE]) {
- if (!changelink) {
- const struct ifla_vxlan_port_range *p
- = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
- conf->port_min = ntohs(p->low);
- conf->port_max = ntohs(p->high);
- } else {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
- "Cannot change port range");
- return -EOPNOTSUPP;
- }
- }
-
- if (data[IFLA_VXLAN_PORT]) {
- if (changelink) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
- "Cannot change port");
- return -EOPNOTSUPP;
- }
- conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
- }
-
- if (data[IFLA_VXLAN_UDP_CSUM]) {
- if (changelink) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
- "Cannot change UDP_CSUM flag");
- return -EOPNOTSUPP;
- }
- if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
- conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
- }
-
- if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
- VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
- false, extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
- VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
- false, extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_REMCSUM_TX]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
- VXLAN_F_REMCSUM_TX, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_REMCSUM_RX]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
- VXLAN_F_REMCSUM_RX, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_GBP]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
- VXLAN_F_GBP, changelink, false, extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_GPE]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
- VXLAN_F_GPE, changelink, false,
- extack);
- if (err)
- return err;
- }
-
- if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
- err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
- VXLAN_F_REMCSUM_NOPARTIAL, changelink,
- false, extack);
- if (err)
- return err;
- }
-
- if (tb[IFLA_MTU]) {
- if (changelink) {
- NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
- "Cannot change mtu");
- return -EOPNOTSUPP;
- }
- conf->mtu = nla_get_u32(tb[IFLA_MTU]);
- }
-
- if (data[IFLA_VXLAN_DF])
- conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
-
- return 0;
-}
-
-static int vxlan_newlink(struct net *src_net, struct net_device *dev,
- struct nlattr *tb[], struct nlattr *data[],
- struct netlink_ext_ack *extack)
-{
- struct vxlan_config conf;
- int err;
-
- err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
- if (err)
- return err;
-
- return __vxlan_dev_create(src_net, dev, &conf, extack);
-}
-
-static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
- struct nlattr *data[],
- struct netlink_ext_ack *extack)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct net_device *lowerdev;
- struct vxlan_config conf;
- struct vxlan_rdst *dst;
- int err;
-
- dst = &vxlan->default_dst;
- err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
- if (err)
- return err;
-
- err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
- vxlan, extack);
- if (err)
- return err;
-
- if (dst->remote_dev == lowerdev)
- lowerdev = NULL;
-
- err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
- extack);
- if (err)
- return err;
-
- /* handle default dst entry */
- if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
- u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
-
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
- if (!vxlan_addr_any(&conf.remote_ip)) {
- err = vxlan_fdb_update(vxlan, all_zeros_mac,
- &conf.remote_ip,
- NUD_REACHABLE | NUD_PERMANENT,
- NLM_F_APPEND | NLM_F_CREATE,
- vxlan->cfg.dst_port,
- conf.vni, conf.vni,
- conf.remote_ifindex,
- NTF_SELF, 0, true, extack);
- if (err) {
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
- netdev_adjacent_change_abort(dst->remote_dev,
- lowerdev, dev);
- return err;
- }
- }
- if (!vxlan_addr_any(&dst->remote_ip))
- __vxlan_fdb_delete(vxlan, all_zeros_mac,
- dst->remote_ip,
- vxlan->cfg.dst_port,
- dst->remote_vni,
- dst->remote_vni,
- dst->remote_ifindex,
- true);
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
- }
-
- if (conf.age_interval != vxlan->cfg.age_interval)
- mod_timer(&vxlan->age_timer, jiffies);
-
- netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
- if (lowerdev && lowerdev != dst->remote_dev)
- dst->remote_dev = lowerdev;
- vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
- return 0;
-}
-
-static void vxlan_dellink(struct net_device *dev, struct list_head *head)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
-
- vxlan_flush(vxlan, true);
-
- list_del(&vxlan->next);
- unregister_netdevice_queue(dev, head);
- if (vxlan->default_dst.remote_dev)
- netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
-}
-
-static size_t vxlan_get_size(const struct net_device *dev)
-{
-
- return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
- nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
- nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
- nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
- nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
- nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
- nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
- nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
- nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
- nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
- 0;
-}
-
-static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
-{
- const struct vxlan_dev *vxlan = netdev_priv(dev);
- const struct vxlan_rdst *dst = &vxlan->default_dst;
- struct ifla_vxlan_port_range ports = {
- .low = htons(vxlan->cfg.port_min),
- .high = htons(vxlan->cfg.port_max),
- };
-
- if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
- goto nla_put_failure;
-
- if (!vxlan_addr_any(&dst->remote_ip)) {
- if (dst->remote_ip.sa.sa_family == AF_INET) {
- if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
- dst->remote_ip.sin.sin_addr.s_addr))
- goto nla_put_failure;
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
- &dst->remote_ip.sin6.sin6_addr))
- goto nla_put_failure;
-#endif
- }
- }
-
- if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
- goto nla_put_failure;
-
- if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
- if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
- if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
- vxlan->cfg.saddr.sin.sin_addr.s_addr))
- goto nla_put_failure;
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
- if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
- &vxlan->cfg.saddr.sin6.sin6_addr))
- goto nla_put_failure;
-#endif
- }
- }
-
- if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
- nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
- !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
- nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
- nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
- nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
- nla_put_u8(skb, IFLA_VXLAN_LEARNING,
- !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
- nla_put_u8(skb, IFLA_VXLAN_PROXY,
- !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
- nla_put_u8(skb, IFLA_VXLAN_RSC,
- !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
- nla_put_u8(skb, IFLA_VXLAN_L2MISS,
- !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
- nla_put_u8(skb, IFLA_VXLAN_L3MISS,
- !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
- nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
- !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
- nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
- nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
- nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
- nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
- !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
- nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
- !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
- nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
- !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
- nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
- !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
- nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
- !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
- goto nla_put_failure;
-
- if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
- goto nla_put_failure;
-
- if (vxlan->cfg.flags & VXLAN_F_GBP &&
- nla_put_flag(skb, IFLA_VXLAN_GBP))
- goto nla_put_failure;
-
- if (vxlan->cfg.flags & VXLAN_F_GPE &&
- nla_put_flag(skb, IFLA_VXLAN_GPE))
- goto nla_put_failure;
-
- if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
- nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
- goto nla_put_failure;
-
- return 0;
-
-nla_put_failure:
- return -EMSGSIZE;
-}
-
-static struct net *vxlan_get_link_net(const struct net_device *dev)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
-
- return vxlan->net;
-}
-
-static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
- .kind = "vxlan",
- .maxtype = IFLA_VXLAN_MAX,
- .policy = vxlan_policy,
- .priv_size = sizeof(struct vxlan_dev),
- .setup = vxlan_setup,
- .validate = vxlan_validate,
- .newlink = vxlan_newlink,
- .changelink = vxlan_changelink,
- .dellink = vxlan_dellink,
- .get_size = vxlan_get_size,
- .fill_info = vxlan_fill_info,
- .get_link_net = vxlan_get_link_net,
-};
-
-struct net_device *vxlan_dev_create(struct net *net, const char *name,
- u8 name_assign_type,
- struct vxlan_config *conf)
-{
- struct nlattr *tb[IFLA_MAX + 1];
- struct net_device *dev;
- int err;
-
- memset(&tb, 0, sizeof(tb));
-
- dev = rtnl_create_link(net, name, name_assign_type,
- &vxlan_link_ops, tb, NULL);
- if (IS_ERR(dev))
- return dev;
-
- err = __vxlan_dev_create(net, dev, conf, NULL);
- if (err < 0) {
- free_netdev(dev);
- return ERR_PTR(err);
- }
-
- err = rtnl_configure_link(dev, NULL);
- if (err < 0) {
- LIST_HEAD(list_kill);
-
- vxlan_dellink(dev, &list_kill);
- unregister_netdevice_many(&list_kill);
- return ERR_PTR(err);
- }
-
- return dev;
-}
-EXPORT_SYMBOL_GPL(vxlan_dev_create);
-
-static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
- struct net_device *dev)
-{
- struct vxlan_dev *vxlan, *next;
- LIST_HEAD(list_kill);
-
- list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
- struct vxlan_rdst *dst = &vxlan->default_dst;
-
- /* In case we created vxlan device with carrier
- * and we loose the carrier due to module unload
- * we also need to remove vxlan device. In other
- * cases, it's not necessary and remote_ifindex
- * is 0 here, so no matches.
- */
- if (dst->remote_ifindex == dev->ifindex)
- vxlan_dellink(vxlan->dev, &list_kill);
- }
-
- unregister_netdevice_many(&list_kill);
-}
-
-static int vxlan_netdevice_event(struct notifier_block *unused,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
-
- if (event == NETDEV_UNREGISTER)
- vxlan_handle_lowerdev_unregister(vn, dev);
- else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
- vxlan_offload_rx_ports(dev, true);
- else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
- vxlan_offload_rx_ports(dev, false);
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block vxlan_notifier_block __read_mostly = {
- .notifier_call = vxlan_netdevice_event,
-};
-
-static void
-vxlan_fdb_offloaded_set(struct net_device *dev,
- struct switchdev_notifier_vxlan_fdb_info *fdb_info)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_rdst *rdst;
- struct vxlan_fdb *f;
- u32 hash_index;
-
- hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
-
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
-
- f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
- if (!f)
- goto out;
-
- rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
- fdb_info->remote_port,
- fdb_info->remote_vni,
- fdb_info->remote_ifindex);
- if (!rdst)
- goto out;
-
- rdst->offloaded = fdb_info->offloaded;
-
-out:
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
-}
-
-static int
-vxlan_fdb_external_learn_add(struct net_device *dev,
- struct switchdev_notifier_vxlan_fdb_info *fdb_info)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct netlink_ext_ack *extack;
- u32 hash_index;
- int err;
-
- hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
- extack = switchdev_notifier_info_to_extack(&fdb_info->info);
-
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
- err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
- NUD_REACHABLE,
- NLM_F_CREATE | NLM_F_REPLACE,
- fdb_info->remote_port,
- fdb_info->vni,
- fdb_info->remote_vni,
- fdb_info->remote_ifindex,
- NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
- 0, false, extack);
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
-
- return err;
-}
-
-static int
-vxlan_fdb_external_learn_del(struct net_device *dev,
- struct switchdev_notifier_vxlan_fdb_info *fdb_info)
-{
- struct vxlan_dev *vxlan = netdev_priv(dev);
- struct vxlan_fdb *f;
- u32 hash_index;
- int err = 0;
-
- hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
-
- f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
- if (!f)
- err = -ENOENT;
- else if (f->flags & NTF_EXT_LEARNED)
- err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
- fdb_info->remote_ip,
- fdb_info->remote_port,
- fdb_info->vni,
- fdb_info->remote_vni,
- fdb_info->remote_ifindex,
- false);
-
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
-
- return err;
-}
-
-static int vxlan_switchdev_event(struct notifier_block *unused,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
- struct switchdev_notifier_vxlan_fdb_info *fdb_info;
- int err = 0;
-
- switch (event) {
- case SWITCHDEV_VXLAN_FDB_OFFLOADED:
- vxlan_fdb_offloaded_set(dev, ptr);
- break;
- case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
- fdb_info = ptr;
- err = vxlan_fdb_external_learn_add(dev, fdb_info);
- if (err) {
- err = notifier_from_errno(err);
- break;
- }
- fdb_info->offloaded = true;
- vxlan_fdb_offloaded_set(dev, fdb_info);
- break;
- case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
- fdb_info = ptr;
- err = vxlan_fdb_external_learn_del(dev, fdb_info);
- if (err) {
- err = notifier_from_errno(err);
- break;
- }
- fdb_info->offloaded = false;
- vxlan_fdb_offloaded_set(dev, fdb_info);
- break;
- }
-
- return err;
-}
-
-static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
- .notifier_call = vxlan_switchdev_event,
-};
-
-static void vxlan_fdb_nh_flush(struct nexthop *nh)
-{
- struct vxlan_fdb *fdb;
- struct vxlan_dev *vxlan;
- u32 hash_index;
-
- rcu_read_lock();
- list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
- vxlan = rcu_dereference(fdb->vdev);
- WARN_ON(!vxlan);
- hash_index = fdb_head_index(vxlan, fdb->eth_addr,
- vxlan->default_dst.remote_vni);
- spin_lock_bh(&vxlan->hash_lock[hash_index]);
- if (!hlist_unhashed(&fdb->hlist))
- vxlan_fdb_destroy(vxlan, fdb, false, false);
- spin_unlock_bh(&vxlan->hash_lock[hash_index]);
- }
- rcu_read_unlock();
-}
-
-static int vxlan_nexthop_event(struct notifier_block *nb,
- unsigned long event, void *ptr)
-{
- struct nh_notifier_info *info = ptr;
- struct nexthop *nh;
-
- if (event != NEXTHOP_EVENT_DEL)
- return NOTIFY_DONE;
-
- nh = nexthop_find_by_id(info->net, info->id);
- if (!nh)
- return NOTIFY_DONE;
-
- vxlan_fdb_nh_flush(nh);
-
- return NOTIFY_DONE;
-}
-
-static __net_init int vxlan_init_net(struct net *net)
-{
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
- unsigned int h;
-
- INIT_LIST_HEAD(&vn->vxlan_list);
- spin_lock_init(&vn->sock_lock);
- vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
-
- for (h = 0; h < PORT_HASH_SIZE; ++h)
- INIT_HLIST_HEAD(&vn->sock_list[h]);
-
- return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
- NULL);
-}
-
-static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
-{
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
- struct vxlan_dev *vxlan, *next;
- struct net_device *dev, *aux;
-
- for_each_netdev_safe(net, dev, aux)
- if (dev->rtnl_link_ops == &vxlan_link_ops)
- unregister_netdevice_queue(dev, head);
-
- list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
- /* If vxlan->dev is in the same netns, it has already been added
- * to the list by the previous loop.
- */
- if (!net_eq(dev_net(vxlan->dev), net))
- unregister_netdevice_queue(vxlan->dev, head);
- }
-
-}
-
-static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
-{
- struct net *net;
- LIST_HEAD(list);
- unsigned int h;
-
- list_for_each_entry(net, net_list, exit_list) {
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
-
- unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
- }
- rtnl_lock();
- list_for_each_entry(net, net_list, exit_list)
- vxlan_destroy_tunnels(net, &list);
-
- unregister_netdevice_many(&list);
- rtnl_unlock();
-
- list_for_each_entry(net, net_list, exit_list) {
- struct vxlan_net *vn = net_generic(net, vxlan_net_id);
-
- for (h = 0; h < PORT_HASH_SIZE; ++h)
- WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
- }
-}
-
-static struct pernet_operations vxlan_net_ops = {
- .init = vxlan_init_net,
- .exit_batch = vxlan_exit_batch_net,
- .id = &vxlan_net_id,
- .size = sizeof(struct vxlan_net),
-};
-
-static int __init vxlan_init_module(void)
-{
- int rc;
-
- get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
-
- rc = register_pernet_subsys(&vxlan_net_ops);
- if (rc)
- goto out1;
-
- rc = register_netdevice_notifier(&vxlan_notifier_block);
- if (rc)
- goto out2;
-
- rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
- if (rc)
- goto out3;
-
- rc = rtnl_link_register(&vxlan_link_ops);
- if (rc)
- goto out4;
-
- return 0;
-out4:
- unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
-out3:
- unregister_netdevice_notifier(&vxlan_notifier_block);
-out2:
- unregister_pernet_subsys(&vxlan_net_ops);
-out1:
- return rc;
-}
-late_initcall(vxlan_init_module);
-
-static void __exit vxlan_cleanup_module(void)
-{
- rtnl_link_unregister(&vxlan_link_ops);
- unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
- unregister_netdevice_notifier(&vxlan_notifier_block);
- unregister_pernet_subsys(&vxlan_net_ops);
- /* rcu_barrier() is called by netns */
-}
-module_exit(vxlan_cleanup_module);
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(VXLAN_VERSION);
-MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
-MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
-MODULE_ALIAS_RTNL_LINK("vxlan");
--- /dev/null
+#
+# Makefile for the vxlan driver
+#
+
+obj-$(CONFIG_VXLAN) += vxlan.o
+
+vxlan-objs := vxlan_core.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VXLAN: Virtual eXtensible Local Area Network
+ *
+ * Copyright (c) 2012-2013 Vyatta Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/udp.h>
+#include <linux/igmp.h>
+#include <linux/if_ether.h>
+#include <linux/ethtool.h>
+#include <net/arp.h>
+#include <net/ndisc.h>
+#include <net/gro.h>
+#include <net/ipv6_stubs.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/rtnetlink.h>
+#include <net/inet_ecn.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/tun_proto.h>
+#include <net/vxlan.h>
+#include <net/nexthop.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+#endif
+
+#define VXLAN_VERSION "0.1"
+
+#define PORT_HASH_BITS 8
+#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
+#define FDB_AGE_DEFAULT 300 /* 5 min */
+#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
+
+/* UDP port for VXLAN traffic.
+ * The IANA assigned port is 4789, but the Linux default is 8472
+ * for compatibility with early adopters.
+ */
+static unsigned short vxlan_port __read_mostly = 8472;
+module_param_named(udp_port, vxlan_port, ushort, 0444);
+MODULE_PARM_DESC(udp_port, "Destination UDP port");
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+static unsigned int vxlan_net_id;
+static struct rtnl_link_ops vxlan_link_ops;
+
+static const u8 all_zeros_mac[ETH_ALEN + 2];
+
+static int vxlan_sock_add(struct vxlan_dev *vxlan);
+
+static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
+
+/* per-network namespace private data for this module */
+struct vxlan_net {
+ struct list_head vxlan_list;
+ struct hlist_head sock_list[PORT_HASH_SIZE];
+ spinlock_t sock_lock;
+ struct notifier_block nexthop_notifier_block;
+};
+
+/* Forwarding table entry */
+struct vxlan_fdb {
+ struct hlist_node hlist; /* linked list of entries */
+ struct rcu_head rcu;
+ unsigned long updated; /* jiffies */
+ unsigned long used;
+ struct list_head remotes;
+ u8 eth_addr[ETH_ALEN];
+ u16 state; /* see ndm_state */
+ __be32 vni;
+ u16 flags; /* see ndm_flags and below */
+ struct list_head nh_list;
+ struct nexthop __rcu *nh;
+ struct vxlan_dev __rcu *vdev;
+};
+
+#define NTF_VXLAN_ADDED_BY_USER 0x100
+
+/* salt for hash table */
+static u32 vxlan_salt __read_mostly;
+
+static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
+{
+ return vs->flags & VXLAN_F_COLLECT_METADATA ||
+ ip_tunnel_collect_metadata();
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+ if (a->sa.sa_family != b->sa.sa_family)
+ return false;
+ if (a->sa.sa_family == AF_INET6)
+ return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
+ else
+ return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
+}
+
+static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+ if (nla_len(nla) >= sizeof(struct in6_addr)) {
+ ip->sin6.sin6_addr = nla_get_in6_addr(nla);
+ ip->sa.sa_family = AF_INET6;
+ return 0;
+ } else if (nla_len(nla) >= sizeof(__be32)) {
+ ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
+ ip->sa.sa_family = AF_INET;
+ return 0;
+ } else {
+ return -EAFNOSUPPORT;
+ }
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+ const union vxlan_addr *ip)
+{
+ if (ip->sa.sa_family == AF_INET6)
+ return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
+ else
+ return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
+}
+
+#else /* !CONFIG_IPV6 */
+
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+ return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
+}
+
+static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+ if (nla_len(nla) >= sizeof(struct in6_addr)) {
+ return -EAFNOSUPPORT;
+ } else if (nla_len(nla) >= sizeof(__be32)) {
+ ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
+ ip->sa.sa_family = AF_INET;
+ return 0;
+ } else {
+ return -EAFNOSUPPORT;
+ }
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+ const union vxlan_addr *ip)
+{
+ return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
+}
+#endif
+
+/* Virtual Network hash table head */
+static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
+{
+ return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
+}
+
+/* Socket hash table head */
+static inline struct hlist_head *vs_head(struct net *net, __be16 port)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+ return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
+}
+
+/* First remote destination for a forwarding entry.
+ * Guaranteed to be non-NULL because remotes are never deleted.
+ */
+static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
+{
+ if (rcu_access_pointer(fdb->nh))
+ return NULL;
+ return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
+}
+
+static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
+{
+ if (rcu_access_pointer(fdb->nh))
+ return NULL;
+ return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
+}
+
+/* Find VXLAN socket based on network namespace, address family, UDP port,
+ * enabled unshareable flags and socket device binding (see l3mdev with
+ * non-default VRF).
+ */
+static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
+ __be16 port, u32 flags, int ifindex)
+{
+ struct vxlan_sock *vs;
+
+ flags &= VXLAN_F_RCV_FLAGS;
+
+ hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
+ if (inet_sk(vs->sock->sk)->inet_sport == port &&
+ vxlan_get_sk_family(vs) == family &&
+ vs->flags == flags &&
+ vs->sock->sk->sk_bound_dev_if == ifindex)
+ return vs;
+ }
+ return NULL;
+}
+
+static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
+ __be32 vni)
+{
+ struct vxlan_dev_node *node;
+
+ /* For flow based devices, map all packets to VNI 0 */
+ if (vs->flags & VXLAN_F_COLLECT_METADATA)
+ vni = 0;
+
+ hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
+ if (node->vxlan->default_dst.remote_vni != vni)
+ continue;
+
+ if (IS_ENABLED(CONFIG_IPV6)) {
+ const struct vxlan_config *cfg = &node->vxlan->cfg;
+
+ if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
+ cfg->remote_ifindex != ifindex)
+ continue;
+ }
+
+ return node->vxlan;
+ }
+
+ return NULL;
+}
+
+/* Look up VNI in a per net namespace table */
+static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
+ __be32 vni, sa_family_t family,
+ __be16 port, u32 flags)
+{
+ struct vxlan_sock *vs;
+
+ vs = vxlan_find_sock(net, family, port, flags, ifindex);
+ if (!vs)
+ return NULL;
+
+ return vxlan_vs_find_vni(vs, ifindex, vni);
+}
+
+/* Fill in neighbour message in skbuff. */
+static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
+ const struct vxlan_fdb *fdb,
+ u32 portid, u32 seq, int type, unsigned int flags,
+ const struct vxlan_rdst *rdst)
+{
+ unsigned long now = jiffies;
+ struct nda_cacheinfo ci;
+ bool send_ip, send_eth;
+ struct nlmsghdr *nlh;
+ struct nexthop *nh;
+ struct ndmsg *ndm;
+ int nh_family;
+ u32 nh_id;
+
+ nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
+ if (nlh == NULL)
+ return -EMSGSIZE;
+
+ ndm = nlmsg_data(nlh);
+ memset(ndm, 0, sizeof(*ndm));
+
+ send_eth = send_ip = true;
+
+ rcu_read_lock();
+ nh = rcu_dereference(fdb->nh);
+ if (nh) {
+ nh_family = nexthop_get_family(nh);
+ nh_id = nh->id;
+ }
+ rcu_read_unlock();
+
+ if (type == RTM_GETNEIGH) {
+ if (rdst) {
+ send_ip = !vxlan_addr_any(&rdst->remote_ip);
+ ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
+ } else if (nh) {
+ ndm->ndm_family = nh_family;
+ }
+ send_eth = !is_zero_ether_addr(fdb->eth_addr);
+ } else
+ ndm->ndm_family = AF_BRIDGE;
+ ndm->ndm_state = fdb->state;
+ ndm->ndm_ifindex = vxlan->dev->ifindex;
+ ndm->ndm_flags = fdb->flags;
+ if (rdst && rdst->offloaded)
+ ndm->ndm_flags |= NTF_OFFLOADED;
+ ndm->ndm_type = RTN_UNICAST;
+
+ if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
+ nla_put_s32(skb, NDA_LINK_NETNSID,
+ peernet2id(dev_net(vxlan->dev), vxlan->net)))
+ goto nla_put_failure;
+
+ if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
+ goto nla_put_failure;
+ if (nh) {
+ if (nla_put_u32(skb, NDA_NH_ID, nh_id))
+ goto nla_put_failure;
+ } else if (rdst) {
+ if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
+ &rdst->remote_ip))
+ goto nla_put_failure;
+
+ if (rdst->remote_port &&
+ rdst->remote_port != vxlan->cfg.dst_port &&
+ nla_put_be16(skb, NDA_PORT, rdst->remote_port))
+ goto nla_put_failure;
+ if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
+ nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
+ goto nla_put_failure;
+ if (rdst->remote_ifindex &&
+ nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
+ goto nla_put_failure;
+ }
+
+ if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
+ nla_put_u32(skb, NDA_SRC_VNI,
+ be32_to_cpu(fdb->vni)))
+ goto nla_put_failure;
+
+ ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
+ ci.ndm_confirmed = 0;
+ ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
+ ci.ndm_refcnt = 0;
+
+ if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static inline size_t vxlan_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ndmsg))
+ + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
+ + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
+ + nla_total_size(sizeof(__be16)) /* NDA_PORT */
+ + nla_total_size(sizeof(__be32)) /* NDA_VNI */
+ + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
+ + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
+ + nla_total_size(sizeof(struct nda_cacheinfo));
+}
+
+static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+ struct vxlan_rdst *rd, int type)
+{
+ struct net *net = dev_net(vxlan->dev);
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
+ if (skb == NULL)
+ goto errout;
+
+ err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+
+ rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
+}
+
+static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
+ const struct vxlan_fdb *fdb,
+ const struct vxlan_rdst *rd,
+ struct netlink_ext_ack *extack,
+ struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+ fdb_info->info.dev = vxlan->dev;
+ fdb_info->info.extack = extack;
+ fdb_info->remote_ip = rd->remote_ip;
+ fdb_info->remote_port = rd->remote_port;
+ fdb_info->remote_vni = rd->remote_vni;
+ fdb_info->remote_ifindex = rd->remote_ifindex;
+ memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
+ fdb_info->vni = fdb->vni;
+ fdb_info->offloaded = rd->offloaded;
+ fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
+}
+
+static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
+ struct vxlan_fdb *fdb,
+ struct vxlan_rdst *rd,
+ bool adding,
+ struct netlink_ext_ack *extack)
+{
+ struct switchdev_notifier_vxlan_fdb_info info;
+ enum switchdev_notifier_type notifier_type;
+ int ret;
+
+ if (WARN_ON(!rd))
+ return 0;
+
+ notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
+ : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
+ vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
+ ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
+ &info.info, extack);
+ return notifier_to_errno(ret);
+}
+
+static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+ struct vxlan_rdst *rd, int type, bool swdev_notify,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+
+ if (swdev_notify && rd) {
+ switch (type) {
+ case RTM_NEWNEIGH:
+ err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
+ true, extack);
+ if (err)
+ return err;
+ break;
+ case RTM_DELNEIGH:
+ vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
+ false, extack);
+ break;
+ }
+ }
+
+ __vxlan_fdb_notify(vxlan, fdb, rd, type);
+ return 0;
+}
+
+static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb f = {
+ .state = NUD_STALE,
+ };
+ struct vxlan_rdst remote = {
+ .remote_ip = *ipa, /* goes to NDA_DST */
+ .remote_vni = cpu_to_be32(VXLAN_N_VID),
+ };
+
+ vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
+}
+
+static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
+{
+ struct vxlan_fdb f = {
+ .state = NUD_STALE,
+ };
+ struct vxlan_rdst remote = { };
+
+ memcpy(f.eth_addr, eth_addr, ETH_ALEN);
+
+ vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
+}
+
+/* Hash Ethernet address */
+static u32 eth_hash(const unsigned char *addr)
+{
+ u64 value = get_unaligned((u64 *)addr);
+
+ /* only want 6 bytes */
+#ifdef __BIG_ENDIAN
+ value >>= 16;
+#else
+ value <<= 16;
+#endif
+ return hash_64(value, FDB_HASH_BITS);
+}
+
+static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
+{
+ /* use 1 byte of OUI and 3 bytes of NIC */
+ u32 key = get_unaligned((u32 *)(addr + 2));
+
+ return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
+}
+
+static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
+{
+ if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
+ return eth_vni_hash(mac, vni);
+ else
+ return eth_hash(mac);
+}
+
+/* Hash chain to use given mac address */
+static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
+ const u8 *mac, __be32 vni)
+{
+ return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
+}
+
+/* Look up Ethernet address in forwarding table */
+static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
+ const u8 *mac, __be32 vni)
+{
+ struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
+ struct vxlan_fdb *f;
+
+ hlist_for_each_entry_rcu(f, head, hlist) {
+ if (ether_addr_equal(mac, f->eth_addr)) {
+ if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
+ if (vni == f->vni)
+ return f;
+ } else {
+ return f;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
+ const u8 *mac, __be32 vni)
+{
+ struct vxlan_fdb *f;
+
+ f = __vxlan_find_mac(vxlan, mac, vni);
+ if (f && f->used != jiffies)
+ f->used = jiffies;
+
+ return f;
+}
+
+/* caller should hold vxlan->hash_lock */
+static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port,
+ __be32 vni, __u32 ifindex)
+{
+ struct vxlan_rdst *rd;
+
+ list_for_each_entry(rd, &f->remotes, list) {
+ if (vxlan_addr_equal(&rd->remote_ip, ip) &&
+ rd->remote_port == port &&
+ rd->remote_vni == vni &&
+ rd->remote_ifindex == ifindex)
+ return rd;
+ }
+
+ return NULL;
+}
+
+int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
+ struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ u8 eth_addr[ETH_ALEN + 2] = { 0 };
+ struct vxlan_rdst *rdst;
+ struct vxlan_fdb *f;
+ int rc = 0;
+
+ if (is_multicast_ether_addr(mac) ||
+ is_zero_ether_addr(mac))
+ return -EINVAL;
+
+ ether_addr_copy(eth_addr, mac);
+
+ rcu_read_lock();
+
+ f = __vxlan_find_mac(vxlan, eth_addr, vni);
+ if (!f) {
+ rc = -ENOENT;
+ goto out;
+ }
+
+ rdst = first_remote_rcu(f);
+ vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
+
+out:
+ rcu_read_unlock();
+ return rc;
+}
+EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
+
+static int vxlan_fdb_notify_one(struct notifier_block *nb,
+ const struct vxlan_dev *vxlan,
+ const struct vxlan_fdb *f,
+ const struct vxlan_rdst *rdst,
+ struct netlink_ext_ack *extack)
+{
+ struct switchdev_notifier_vxlan_fdb_info fdb_info;
+ int rc;
+
+ vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
+ rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
+ &fdb_info);
+ return notifier_to_errno(rc);
+}
+
+int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
+ struct notifier_block *nb,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_dev *vxlan;
+ struct vxlan_rdst *rdst;
+ struct vxlan_fdb *f;
+ unsigned int h;
+ int rc = 0;
+
+ if (!netif_is_vxlan(dev))
+ return -EINVAL;
+ vxlan = netdev_priv(dev);
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ spin_lock_bh(&vxlan->hash_lock[h]);
+ hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
+ if (f->vni == vni) {
+ list_for_each_entry(rdst, &f->remotes, list) {
+ rc = vxlan_fdb_notify_one(nb, vxlan,
+ f, rdst,
+ extack);
+ if (rc)
+ goto unlock;
+ }
+ }
+ }
+ spin_unlock_bh(&vxlan->hash_lock[h]);
+ }
+ return 0;
+
+unlock:
+ spin_unlock_bh(&vxlan->hash_lock[h]);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
+
+void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
+{
+ struct vxlan_dev *vxlan;
+ struct vxlan_rdst *rdst;
+ struct vxlan_fdb *f;
+ unsigned int h;
+
+ if (!netif_is_vxlan(dev))
+ return;
+ vxlan = netdev_priv(dev);
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ spin_lock_bh(&vxlan->hash_lock[h]);
+ hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
+ if (f->vni == vni)
+ list_for_each_entry(rdst, &f->remotes, list)
+ rdst->offloaded = false;
+ spin_unlock_bh(&vxlan->hash_lock[h]);
+ }
+
+}
+EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
+
+/* Replace destination of unicast mac */
+static int vxlan_fdb_replace(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port, __be32 vni,
+ __u32 ifindex, struct vxlan_rdst *oldrd)
+{
+ struct vxlan_rdst *rd;
+
+ rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+ if (rd)
+ return 0;
+
+ rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
+ if (!rd)
+ return 0;
+
+ *oldrd = *rd;
+ dst_cache_reset(&rd->dst_cache);
+ rd->remote_ip = *ip;
+ rd->remote_port = port;
+ rd->remote_vni = vni;
+ rd->remote_ifindex = ifindex;
+ rd->offloaded = false;
+ return 1;
+}
+
+/* Add/update destinations for multicast */
+static int vxlan_fdb_append(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port, __be32 vni,
+ __u32 ifindex, struct vxlan_rdst **rdp)
+{
+ struct vxlan_rdst *rd;
+
+ rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+ if (rd)
+ return 0;
+
+ rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
+ if (rd == NULL)
+ return -ENOBUFS;
+
+ if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
+ kfree(rd);
+ return -ENOBUFS;
+ }
+
+ rd->remote_ip = *ip;
+ rd->remote_port = port;
+ rd->offloaded = false;
+ rd->remote_vni = vni;
+ rd->remote_ifindex = ifindex;
+
+ list_add_tail_rcu(&rd->list, &f->remotes);
+
+ *rdp = rd;
+ return 1;
+}
+
+static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
+ unsigned int off,
+ struct vxlanhdr *vh, size_t hdrlen,
+ __be32 vni_field,
+ struct gro_remcsum *grc,
+ bool nopartial)
+{
+ size_t start, offset;
+
+ if (skb->remcsum_offload)
+ return vh;
+
+ if (!NAPI_GRO_CB(skb)->csum_valid)
+ return NULL;
+
+ start = vxlan_rco_start(vni_field);
+ offset = start + vxlan_rco_offset(vni_field);
+
+ vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
+ start, offset, grc, nopartial);
+
+ skb->remcsum_offload = 1;
+
+ return vh;
+}
+
+static struct sk_buff *vxlan_gro_receive(struct sock *sk,
+ struct list_head *head,
+ struct sk_buff *skb)
+{
+ struct sk_buff *pp = NULL;
+ struct sk_buff *p;
+ struct vxlanhdr *vh, *vh2;
+ unsigned int hlen, off_vx;
+ int flush = 1;
+ struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
+ __be32 flags;
+ struct gro_remcsum grc;
+
+ skb_gro_remcsum_init(&grc);
+
+ off_vx = skb_gro_offset(skb);
+ hlen = off_vx + sizeof(*vh);
+ vh = skb_gro_header_fast(skb, off_vx);
+ if (skb_gro_header_hard(skb, hlen)) {
+ vh = skb_gro_header_slow(skb, hlen, off_vx);
+ if (unlikely(!vh))
+ goto out;
+ }
+
+ skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
+
+ flags = vh->vx_flags;
+
+ if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
+ vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
+ vh->vx_vni, &grc,
+ !!(vs->flags &
+ VXLAN_F_REMCSUM_NOPARTIAL));
+
+ if (!vh)
+ goto out;
+ }
+
+ skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
+
+ list_for_each_entry(p, head, list) {
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ vh2 = (struct vxlanhdr *)(p->data + off_vx);
+ if (vh->vx_flags != vh2->vx_flags ||
+ vh->vx_vni != vh2->vx_vni) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ pp = call_gro_receive(eth_gro_receive, head, skb);
+ flush = 0;
+
+out:
+ skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
+
+ return pp;
+}
+
+static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+{
+ /* Sets 'skb->inner_mac_header' since we are always called with
+ * 'skb->encapsulation' set.
+ */
+ return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
+}
+
+static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
+ __u16 state, __be32 src_vni,
+ __u16 ndm_flags)
+{
+ struct vxlan_fdb *f;
+
+ f = kmalloc(sizeof(*f), GFP_ATOMIC);
+ if (!f)
+ return NULL;
+ f->state = state;
+ f->flags = ndm_flags;
+ f->updated = f->used = jiffies;
+ f->vni = src_vni;
+ f->nh = NULL;
+ RCU_INIT_POINTER(f->vdev, vxlan);
+ INIT_LIST_HEAD(&f->nh_list);
+ INIT_LIST_HEAD(&f->remotes);
+ memcpy(f->eth_addr, mac, ETH_ALEN);
+
+ return f;
+}
+
+static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
+ __be32 src_vni, struct vxlan_fdb *f)
+{
+ ++vxlan->addrcnt;
+ hlist_add_head_rcu(&f->hlist,
+ vxlan_fdb_head(vxlan, mac, src_vni));
+}
+
+static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+ u32 nhid, struct netlink_ext_ack *extack)
+{
+ struct nexthop *old_nh = rtnl_dereference(fdb->nh);
+ struct nexthop *nh;
+ int err = -EINVAL;
+
+ if (old_nh && old_nh->id == nhid)
+ return 0;
+
+ nh = nexthop_find_by_id(vxlan->net, nhid);
+ if (!nh) {
+ NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
+ goto err_inval;
+ }
+
+ if (nh) {
+ if (!nexthop_get(nh)) {
+ NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
+ nh = NULL;
+ goto err_inval;
+ }
+ if (!nexthop_is_fdb(nh)) {
+ NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
+ goto err_inval;
+ }
+
+ if (!nexthop_is_multipath(nh)) {
+ NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
+ goto err_inval;
+ }
+
+ /* check nexthop group family */
+ switch (vxlan->default_dst.remote_ip.sa.sa_family) {
+ case AF_INET:
+ if (!nexthop_has_v4(nh)) {
+ err = -EAFNOSUPPORT;
+ NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
+ goto err_inval;
+ }
+ break;
+ case AF_INET6:
+ if (nexthop_has_v4(nh)) {
+ err = -EAFNOSUPPORT;
+ NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
+ goto err_inval;
+ }
+ }
+ }
+
+ if (old_nh) {
+ list_del_rcu(&fdb->nh_list);
+ nexthop_put(old_nh);
+ }
+ rcu_assign_pointer(fdb->nh, nh);
+ list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
+ return 1;
+
+err_inval:
+ if (nh)
+ nexthop_put(nh);
+ return err;
+}
+
+static int vxlan_fdb_create(struct vxlan_dev *vxlan,
+ const u8 *mac, union vxlan_addr *ip,
+ __u16 state, __be16 port, __be32 src_vni,
+ __be32 vni, __u32 ifindex, __u16 ndm_flags,
+ u32 nhid, struct vxlan_fdb **fdb,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_rdst *rd = NULL;
+ struct vxlan_fdb *f;
+ int rc;
+
+ if (vxlan->cfg.addrmax &&
+ vxlan->addrcnt >= vxlan->cfg.addrmax)
+ return -ENOSPC;
+
+ netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
+ f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
+ if (!f)
+ return -ENOMEM;
+
+ if (nhid)
+ rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
+ else
+ rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
+ if (rc < 0)
+ goto errout;
+
+ *fdb = f;
+
+ return 0;
+
+errout:
+ kfree(f);
+ return rc;
+}
+
+static void __vxlan_fdb_free(struct vxlan_fdb *f)
+{
+ struct vxlan_rdst *rd, *nd;
+ struct nexthop *nh;
+
+ nh = rcu_dereference_raw(f->nh);
+ if (nh) {
+ rcu_assign_pointer(f->nh, NULL);
+ rcu_assign_pointer(f->vdev, NULL);
+ nexthop_put(nh);
+ }
+
+ list_for_each_entry_safe(rd, nd, &f->remotes, list) {
+ dst_cache_destroy(&rd->dst_cache);
+ kfree(rd);
+ }
+ kfree(f);
+}
+
+static void vxlan_fdb_free(struct rcu_head *head)
+{
+ struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
+
+ __vxlan_fdb_free(f);
+}
+
+static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
+ bool do_notify, bool swdev_notify)
+{
+ struct vxlan_rdst *rd;
+
+ netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
+
+ --vxlan->addrcnt;
+ if (do_notify) {
+ if (rcu_access_pointer(f->nh))
+ vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
+ swdev_notify, NULL);
+ else
+ list_for_each_entry(rd, &f->remotes, list)
+ vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
+ swdev_notify, NULL);
+ }
+
+ hlist_del_rcu(&f->hlist);
+ list_del_rcu(&f->nh_list);
+ call_rcu(&f->rcu, vxlan_fdb_free);
+}
+
+static void vxlan_dst_free(struct rcu_head *head)
+{
+ struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
+
+ dst_cache_destroy(&rd->dst_cache);
+ kfree(rd);
+}
+
+static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
+ union vxlan_addr *ip,
+ __u16 state, __u16 flags,
+ __be16 port, __be32 vni,
+ __u32 ifindex, __u16 ndm_flags,
+ struct vxlan_fdb *f, u32 nhid,
+ bool swdev_notify,
+ struct netlink_ext_ack *extack)
+{
+ __u16 fdb_flags = (ndm_flags & ~NTF_USE);
+ struct vxlan_rdst *rd = NULL;
+ struct vxlan_rdst oldrd;
+ int notify = 0;
+ int rc = 0;
+ int err;
+
+ if (nhid && !rcu_access_pointer(f->nh)) {
+ NL_SET_ERR_MSG(extack,
+ "Cannot replace an existing non nexthop fdb with a nexthop");
+ return -EOPNOTSUPP;
+ }
+
+ if (nhid && (flags & NLM_F_APPEND)) {
+ NL_SET_ERR_MSG(extack,
+ "Cannot append to a nexthop fdb");
+ return -EOPNOTSUPP;
+ }
+
+ /* Do not allow an externally learned entry to take over an entry added
+ * by the user.
+ */
+ if (!(fdb_flags & NTF_EXT_LEARNED) ||
+ !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
+ if (f->state != state) {
+ f->state = state;
+ f->updated = jiffies;
+ notify = 1;
+ }
+ if (f->flags != fdb_flags) {
+ f->flags = fdb_flags;
+ f->updated = jiffies;
+ notify = 1;
+ }
+ }
+
+ if ((flags & NLM_F_REPLACE)) {
+ /* Only change unicasts */
+ if (!(is_multicast_ether_addr(f->eth_addr) ||
+ is_zero_ether_addr(f->eth_addr))) {
+ if (nhid) {
+ rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
+ if (rc < 0)
+ return rc;
+ } else {
+ rc = vxlan_fdb_replace(f, ip, port, vni,
+ ifindex, &oldrd);
+ }
+ notify |= rc;
+ } else {
+ NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
+ return -EOPNOTSUPP;
+ }
+ }
+ if ((flags & NLM_F_APPEND) &&
+ (is_multicast_ether_addr(f->eth_addr) ||
+ is_zero_ether_addr(f->eth_addr))) {
+ rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
+
+ if (rc < 0)
+ return rc;
+ notify |= rc;
+ }
+
+ if (ndm_flags & NTF_USE)
+ f->used = jiffies;
+
+ if (notify) {
+ if (rd == NULL)
+ rd = first_remote_rtnl(f);
+
+ err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
+ swdev_notify, extack);
+ if (err)
+ goto err_notify;
+ }
+
+ return 0;
+
+err_notify:
+ if (nhid)
+ return err;
+ if ((flags & NLM_F_REPLACE) && rc)
+ *rd = oldrd;
+ else if ((flags & NLM_F_APPEND) && rc) {
+ list_del_rcu(&rd->list);
+ call_rcu(&rd->rcu, vxlan_dst_free);
+ }
+ return err;
+}
+
+static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
+ const u8 *mac, union vxlan_addr *ip,
+ __u16 state, __u16 flags,
+ __be16 port, __be32 src_vni, __be32 vni,
+ __u32 ifindex, __u16 ndm_flags, u32 nhid,
+ bool swdev_notify,
+ struct netlink_ext_ack *extack)
+{
+ __u16 fdb_flags = (ndm_flags & ~NTF_USE);
+ struct vxlan_fdb *f;
+ int rc;
+
+ /* Disallow replace to add a multicast entry */
+ if ((flags & NLM_F_REPLACE) &&
+ (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
+ return -EOPNOTSUPP;
+
+ netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
+ rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
+ vni, ifindex, fdb_flags, nhid, &f, extack);
+ if (rc < 0)
+ return rc;
+
+ vxlan_fdb_insert(vxlan, mac, src_vni, f);
+ rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
+ swdev_notify, extack);
+ if (rc)
+ goto err_notify;
+
+ return 0;
+
+err_notify:
+ vxlan_fdb_destroy(vxlan, f, false, false);
+ return rc;
+}
+
+/* Add new entry to forwarding table -- assumes lock held */
+static int vxlan_fdb_update(struct vxlan_dev *vxlan,
+ const u8 *mac, union vxlan_addr *ip,
+ __u16 state, __u16 flags,
+ __be16 port, __be32 src_vni, __be32 vni,
+ __u32 ifindex, __u16 ndm_flags, u32 nhid,
+ bool swdev_notify,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_fdb *f;
+
+ f = __vxlan_find_mac(vxlan, mac, src_vni);
+ if (f) {
+ if (flags & NLM_F_EXCL) {
+ netdev_dbg(vxlan->dev,
+ "lost race to create %pM\n", mac);
+ return -EEXIST;
+ }
+
+ return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
+ vni, ifindex, ndm_flags, f,
+ nhid, swdev_notify, extack);
+ } else {
+ if (!(flags & NLM_F_CREATE))
+ return -ENOENT;
+
+ return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
+ port, src_vni, vni, ifindex,
+ ndm_flags, nhid, swdev_notify,
+ extack);
+ }
+}
+
+static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
+ struct vxlan_rdst *rd, bool swdev_notify)
+{
+ list_del_rcu(&rd->list);
+ vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
+ call_rcu(&rd->rcu, vxlan_dst_free);
+}
+
+static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
+ union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
+ __be32 *vni, u32 *ifindex, u32 *nhid)
+{
+ struct net *net = dev_net(vxlan->dev);
+ int err;
+
+ if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
+ tb[NDA_PORT]))
+ return -EINVAL;
+
+ if (tb[NDA_DST]) {
+ err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
+ if (err)
+ return err;
+ } else {
+ union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
+
+ if (remote->sa.sa_family == AF_INET) {
+ ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ ip->sa.sa_family = AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ ip->sin6.sin6_addr = in6addr_any;
+ ip->sa.sa_family = AF_INET6;
+#endif
+ }
+ }
+
+ if (tb[NDA_PORT]) {
+ if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
+ return -EINVAL;
+ *port = nla_get_be16(tb[NDA_PORT]);
+ } else {
+ *port = vxlan->cfg.dst_port;
+ }
+
+ if (tb[NDA_VNI]) {
+ if (nla_len(tb[NDA_VNI]) != sizeof(u32))
+ return -EINVAL;
+ *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
+ } else {
+ *vni = vxlan->default_dst.remote_vni;
+ }
+
+ if (tb[NDA_SRC_VNI]) {
+ if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
+ return -EINVAL;
+ *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
+ } else {
+ *src_vni = vxlan->default_dst.remote_vni;
+ }
+
+ if (tb[NDA_IFINDEX]) {
+ struct net_device *tdev;
+
+ if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
+ return -EINVAL;
+ *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
+ tdev = __dev_get_by_index(net, *ifindex);
+ if (!tdev)
+ return -EADDRNOTAVAIL;
+ } else {
+ *ifindex = 0;
+ }
+
+ if (tb[NDA_NH_ID])
+ *nhid = nla_get_u32(tb[NDA_NH_ID]);
+ else
+ *nhid = 0;
+
+ return 0;
+}
+
+/* Add static entry (via netlink) */
+static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
+ struct net_device *dev,
+ const unsigned char *addr, u16 vid, u16 flags,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ /* struct net *net = dev_net(vxlan->dev); */
+ union vxlan_addr ip;
+ __be16 port;
+ __be32 src_vni, vni;
+ u32 ifindex, nhid;
+ u32 hash_index;
+ int err;
+
+ if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
+ pr_info("RTM_NEWNEIGH with invalid state %#x\n",
+ ndm->ndm_state);
+ return -EINVAL;
+ }
+
+ if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
+ return -EINVAL;
+
+ err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
+ &nhid);
+ if (err)
+ return err;
+
+ if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
+ return -EAFNOSUPPORT;
+
+ hash_index = fdb_head_index(vxlan, addr, src_vni);
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+ err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
+ port, src_vni, vni, ifindex,
+ ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
+ nhid, true, extack);
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+ return err;
+}
+
+static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
+ const unsigned char *addr, union vxlan_addr ip,
+ __be16 port, __be32 src_vni, __be32 vni,
+ u32 ifindex, bool swdev_notify)
+{
+ struct vxlan_rdst *rd = NULL;
+ struct vxlan_fdb *f;
+ int err = -ENOENT;
+
+ f = vxlan_find_mac(vxlan, addr, src_vni);
+ if (!f)
+ return err;
+
+ if (!vxlan_addr_any(&ip)) {
+ rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
+ if (!rd)
+ goto out;
+ }
+
+ /* remove a destination if it's not the only one on the list,
+ * otherwise destroy the fdb entry
+ */
+ if (rd && !list_is_singular(&f->remotes)) {
+ vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
+ goto out;
+ }
+
+ vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
+
+out:
+ return 0;
+}
+
+/* Delete entry (via netlink) */
+static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
+ struct net_device *dev,
+ const unsigned char *addr, u16 vid)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ union vxlan_addr ip;
+ __be32 src_vni, vni;
+ u32 ifindex, nhid;
+ u32 hash_index;
+ __be16 port;
+ int err;
+
+ err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
+ &nhid);
+ if (err)
+ return err;
+
+ hash_index = fdb_head_index(vxlan, addr, src_vni);
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+ err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
+ true);
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+ return err;
+}
+
+/* Dump forwarding table */
+static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev,
+ struct net_device *filter_dev, int *idx)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ unsigned int h;
+ int err = 0;
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ struct vxlan_fdb *f;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
+ struct vxlan_rdst *rd;
+
+ if (rcu_access_pointer(f->nh)) {
+ if (*idx < cb->args[2])
+ goto skip_nh;
+ err = vxlan_fdb_info(skb, vxlan, f,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNEIGH,
+ NLM_F_MULTI, NULL);
+ if (err < 0) {
+ rcu_read_unlock();
+ goto out;
+ }
+skip_nh:
+ *idx += 1;
+ continue;
+ }
+
+ list_for_each_entry_rcu(rd, &f->remotes, list) {
+ if (*idx < cb->args[2])
+ goto skip;
+
+ err = vxlan_fdb_info(skb, vxlan, f,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNEIGH,
+ NLM_F_MULTI, rd);
+ if (err < 0) {
+ rcu_read_unlock();
+ goto out;
+ }
+skip:
+ *idx += 1;
+ }
+ }
+ rcu_read_unlock();
+ }
+out:
+ return err;
+}
+
+static int vxlan_fdb_get(struct sk_buff *skb,
+ struct nlattr *tb[],
+ struct net_device *dev,
+ const unsigned char *addr,
+ u16 vid, u32 portid, u32 seq,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb *f;
+ __be32 vni;
+ int err;
+
+ if (tb[NDA_VNI])
+ vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
+ else
+ vni = vxlan->default_dst.remote_vni;
+
+ rcu_read_lock();
+
+ f = __vxlan_find_mac(vxlan, addr, vni);
+ if (!f) {
+ NL_SET_ERR_MSG(extack, "Fdb entry not found");
+ err = -ENOENT;
+ goto errout;
+ }
+
+ err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
+ RTM_NEWNEIGH, 0, first_remote_rcu(f));
+errout:
+ rcu_read_unlock();
+ return err;
+}
+
+/* Watch incoming packets to learn mapping between Ethernet address
+ * and Tunnel endpoint.
+ * Return true if packet is bogus and should be dropped.
+ */
+static bool vxlan_snoop(struct net_device *dev,
+ union vxlan_addr *src_ip, const u8 *src_mac,
+ u32 src_ifindex, __be32 vni)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb *f;
+ u32 ifindex = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (src_ip->sa.sa_family == AF_INET6 &&
+ (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
+ ifindex = src_ifindex;
+#endif
+
+ f = vxlan_find_mac(vxlan, src_mac, vni);
+ if (likely(f)) {
+ struct vxlan_rdst *rdst = first_remote_rcu(f);
+
+ if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
+ rdst->remote_ifindex == ifindex))
+ return false;
+
+ /* Don't migrate static entries, drop packets */
+ if (f->state & (NUD_PERMANENT | NUD_NOARP))
+ return true;
+
+ /* Don't override an fdb with nexthop with a learnt entry */
+ if (rcu_access_pointer(f->nh))
+ return true;
+
+ if (net_ratelimit())
+ netdev_info(dev,
+ "%pM migrated from %pIS to %pIS\n",
+ src_mac, &rdst->remote_ip.sa, &src_ip->sa);
+
+ rdst->remote_ip = *src_ip;
+ f->updated = jiffies;
+ vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
+ } else {
+ u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
+
+ /* learned new entry */
+ spin_lock(&vxlan->hash_lock[hash_index]);
+
+ /* close off race between vxlan_flush and incoming packets */
+ if (netif_running(dev))
+ vxlan_fdb_update(vxlan, src_mac, src_ip,
+ NUD_REACHABLE,
+ NLM_F_EXCL|NLM_F_CREATE,
+ vxlan->cfg.dst_port,
+ vni,
+ vxlan->default_dst.remote_vni,
+ ifindex, NTF_SELF, 0, true, NULL);
+ spin_unlock(&vxlan->hash_lock[hash_index]);
+ }
+
+ return false;
+}
+
+/* See if multicast group is already in use by other ID */
+static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
+{
+ struct vxlan_dev *vxlan;
+ struct vxlan_sock *sock4;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct vxlan_sock *sock6;
+#endif
+ unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
+
+ sock4 = rtnl_dereference(dev->vn4_sock);
+
+ /* The vxlan_sock is only used by dev, leaving group has
+ * no effect on other vxlan devices.
+ */
+ if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
+ return false;
+#if IS_ENABLED(CONFIG_IPV6)
+ sock6 = rtnl_dereference(dev->vn6_sock);
+ if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
+ return false;
+#endif
+
+ list_for_each_entry(vxlan, &vn->vxlan_list, next) {
+ if (!netif_running(vxlan->dev) || vxlan == dev)
+ continue;
+
+ if (family == AF_INET &&
+ rtnl_dereference(vxlan->vn4_sock) != sock4)
+ continue;
+#if IS_ENABLED(CONFIG_IPV6)
+ if (family == AF_INET6 &&
+ rtnl_dereference(vxlan->vn6_sock) != sock6)
+ continue;
+#endif
+
+ if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
+ &dev->default_dst.remote_ip))
+ continue;
+
+ if (vxlan->default_dst.remote_ifindex !=
+ dev->default_dst.remote_ifindex)
+ continue;
+
+ return true;
+ }
+
+ return false;
+}
+
+static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
+{
+ struct vxlan_net *vn;
+
+ if (!vs)
+ return false;
+ if (!refcount_dec_and_test(&vs->refcnt))
+ return false;
+
+ vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
+ spin_lock(&vn->sock_lock);
+ hlist_del_rcu(&vs->hlist);
+ udp_tunnel_notify_del_rx_port(vs->sock,
+ (vs->flags & VXLAN_F_GPE) ?
+ UDP_TUNNEL_TYPE_VXLAN_GPE :
+ UDP_TUNNEL_TYPE_VXLAN);
+ spin_unlock(&vn->sock_lock);
+
+ return true;
+}
+
+static void vxlan_sock_release(struct vxlan_dev *vxlan)
+{
+ struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
+#if IS_ENABLED(CONFIG_IPV6)
+ struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
+
+ RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
+#endif
+
+ RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
+ synchronize_net();
+
+ vxlan_vs_del_dev(vxlan);
+
+ if (__vxlan_sock_release_prep(sock4)) {
+ udp_tunnel_sock_release(sock4->sock);
+ kfree(sock4);
+ }
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (__vxlan_sock_release_prep(sock6)) {
+ udp_tunnel_sock_release(sock6->sock);
+ kfree(sock6);
+ }
+#endif
+}
+
+/* Update multicast group membership when first VNI on
+ * multicast address is brought up
+ */
+static int vxlan_igmp_join(struct vxlan_dev *vxlan)
+{
+ struct sock *sk;
+ union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
+ int ifindex = vxlan->default_dst.remote_ifindex;
+ int ret = -EINVAL;
+
+ if (ip->sa.sa_family == AF_INET) {
+ struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
+ struct ip_mreqn mreq = {
+ .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
+ .imr_ifindex = ifindex,
+ };
+
+ sk = sock4->sock->sk;
+ lock_sock(sk);
+ ret = ip_mc_join_group(sk, &mreq);
+ release_sock(sk);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
+
+ sk = sock6->sock->sk;
+ lock_sock(sk);
+ ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
+ &ip->sin6.sin6_addr);
+ release_sock(sk);
+#endif
+ }
+
+ return ret;
+}
+
+/* Inverse of vxlan_igmp_join when last VNI is brought down */
+static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
+{
+ struct sock *sk;
+ union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
+ int ifindex = vxlan->default_dst.remote_ifindex;
+ int ret = -EINVAL;
+
+ if (ip->sa.sa_family == AF_INET) {
+ struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
+ struct ip_mreqn mreq = {
+ .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
+ .imr_ifindex = ifindex,
+ };
+
+ sk = sock4->sock->sk;
+ lock_sock(sk);
+ ret = ip_mc_leave_group(sk, &mreq);
+ release_sock(sk);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
+
+ sk = sock6->sock->sk;
+ lock_sock(sk);
+ ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
+ &ip->sin6.sin6_addr);
+ release_sock(sk);
+#endif
+ }
+
+ return ret;
+}
+
+static bool vxlan_remcsum(struct vxlanhdr *unparsed,
+ struct sk_buff *skb, u32 vxflags)
+{
+ size_t start, offset;
+
+ if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
+ goto out;
+
+ start = vxlan_rco_start(unparsed->vx_vni);
+ offset = start + vxlan_rco_offset(unparsed->vx_vni);
+
+ if (!pskb_may_pull(skb, offset + sizeof(u16)))
+ return false;
+
+ skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
+ !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
+out:
+ unparsed->vx_flags &= ~VXLAN_HF_RCO;
+ unparsed->vx_vni &= VXLAN_VNI_MASK;
+ return true;
+}
+
+static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
+ struct sk_buff *skb, u32 vxflags,
+ struct vxlan_metadata *md)
+{
+ struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
+ struct metadata_dst *tun_dst;
+
+ if (!(unparsed->vx_flags & VXLAN_HF_GBP))
+ goto out;
+
+ md->gbp = ntohs(gbp->policy_id);
+
+ tun_dst = (struct metadata_dst *)skb_dst(skb);
+ if (tun_dst) {
+ tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
+ tun_dst->u.tun_info.options_len = sizeof(*md);
+ }
+ if (gbp->dont_learn)
+ md->gbp |= VXLAN_GBP_DONT_LEARN;
+
+ if (gbp->policy_applied)
+ md->gbp |= VXLAN_GBP_POLICY_APPLIED;
+
+ /* In flow-based mode, GBP is carried in dst_metadata */
+ if (!(vxflags & VXLAN_F_COLLECT_METADATA))
+ skb->mark = md->gbp;
+out:
+ unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
+}
+
+static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
+ __be16 *protocol,
+ struct sk_buff *skb, u32 vxflags)
+{
+ struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
+
+ /* Need to have Next Protocol set for interfaces in GPE mode. */
+ if (!gpe->np_applied)
+ return false;
+ /* "The initial version is 0. If a receiver does not support the
+ * version indicated it MUST drop the packet.
+ */
+ if (gpe->version != 0)
+ return false;
+ /* "When the O bit is set to 1, the packet is an OAM packet and OAM
+ * processing MUST occur." However, we don't implement OAM
+ * processing, thus drop the packet.
+ */
+ if (gpe->oam_flag)
+ return false;
+
+ *protocol = tun_p_to_eth_p(gpe->next_protocol);
+ if (!*protocol)
+ return false;
+
+ unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
+ return true;
+}
+
+static bool vxlan_set_mac(struct vxlan_dev *vxlan,
+ struct vxlan_sock *vs,
+ struct sk_buff *skb, __be32 vni)
+{
+ union vxlan_addr saddr;
+ u32 ifindex = skb->dev->ifindex;
+
+ skb_reset_mac_header(skb);
+ skb->protocol = eth_type_trans(skb, vxlan->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+ /* Ignore packet loops (and multicast echo) */
+ if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
+ return false;
+
+ /* Get address from the outer IP header */
+ if (vxlan_get_sk_family(vs) == AF_INET) {
+ saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+ saddr.sa.sa_family = AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
+ saddr.sa.sa_family = AF_INET6;
+#endif
+ }
+
+ if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
+ vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
+ return false;
+
+ return true;
+}
+
+static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
+ struct sk_buff *skb)
+{
+ int err = 0;
+
+ if (vxlan_get_sk_family(vs) == AF_INET)
+ err = IP_ECN_decapsulate(oiph, skb);
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ err = IP6_ECN_decapsulate(oiph, skb);
+#endif
+
+ if (unlikely(err) && log_ecn_error) {
+ if (vxlan_get_sk_family(vs) == AF_INET)
+ net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+ &((struct iphdr *)oiph)->saddr,
+ ((struct iphdr *)oiph)->tos);
+ else
+ net_info_ratelimited("non-ECT from %pI6\n",
+ &((struct ipv6hdr *)oiph)->saddr);
+ }
+ return err <= 1;
+}
+
+/* Callback from net/ipv4/udp.c to receive packets */
+static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct vxlan_dev *vxlan;
+ struct vxlan_sock *vs;
+ struct vxlanhdr unparsed;
+ struct vxlan_metadata _md;
+ struct vxlan_metadata *md = &_md;
+ __be16 protocol = htons(ETH_P_TEB);
+ bool raw_proto = false;
+ void *oiph;
+ __be32 vni = 0;
+
+ /* Need UDP and VXLAN header to be present */
+ if (!pskb_may_pull(skb, VXLAN_HLEN))
+ goto drop;
+
+ unparsed = *vxlan_hdr(skb);
+ /* VNI flag always required to be set */
+ if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
+ netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
+ ntohl(vxlan_hdr(skb)->vx_flags),
+ ntohl(vxlan_hdr(skb)->vx_vni));
+ /* Return non vxlan pkt */
+ goto drop;
+ }
+ unparsed.vx_flags &= ~VXLAN_HF_VNI;
+ unparsed.vx_vni &= ~VXLAN_VNI_MASK;
+
+ vs = rcu_dereference_sk_user_data(sk);
+ if (!vs)
+ goto drop;
+
+ vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
+
+ vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
+ if (!vxlan)
+ goto drop;
+
+ /* For backwards compatibility, only allow reserved fields to be
+ * used by VXLAN extensions if explicitly requested.
+ */
+ if (vs->flags & VXLAN_F_GPE) {
+ if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
+ goto drop;
+ raw_proto = true;
+ }
+
+ if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
+ !net_eq(vxlan->net, dev_net(vxlan->dev))))
+ goto drop;
+
+ if (vs->flags & VXLAN_F_REMCSUM_RX)
+ if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
+ goto drop;
+
+ if (vxlan_collect_metadata(vs)) {
+ struct metadata_dst *tun_dst;
+
+ tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
+ key32_to_tunnel_id(vni), sizeof(*md));
+
+ if (!tun_dst)
+ goto drop;
+
+ md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
+
+ skb_dst_set(skb, (struct dst_entry *)tun_dst);
+ } else {
+ memset(md, 0, sizeof(*md));
+ }
+
+ if (vs->flags & VXLAN_F_GBP)
+ vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
+ /* Note that GBP and GPE can never be active together. This is
+ * ensured in vxlan_dev_configure.
+ */
+
+ if (unparsed.vx_flags || unparsed.vx_vni) {
+ /* If there are any unprocessed flags remaining treat
+ * this as a malformed packet. This behavior diverges from
+ * VXLAN RFC (RFC7348) which stipulates that bits in reserved
+ * in reserved fields are to be ignored. The approach here
+ * maintains compatibility with previous stack code, and also
+ * is more robust and provides a little more security in
+ * adding extensions to VXLAN.
+ */
+ goto drop;
+ }
+
+ if (!raw_proto) {
+ if (!vxlan_set_mac(vxlan, vs, skb, vni))
+ goto drop;
+ } else {
+ skb_reset_mac_header(skb);
+ skb->dev = vxlan->dev;
+ skb->pkt_type = PACKET_HOST;
+ }
+
+ oiph = skb_network_header(skb);
+ skb_reset_network_header(skb);
+
+ if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
+ ++vxlan->dev->stats.rx_frame_errors;
+ ++vxlan->dev->stats.rx_errors;
+ goto drop;
+ }
+
+ rcu_read_lock();
+
+ if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
+ rcu_read_unlock();
+ atomic_long_inc(&vxlan->dev->rx_dropped);
+ goto drop;
+ }
+
+ dev_sw_netstats_rx_add(vxlan->dev, skb->len);
+ gro_cells_receive(&vxlan->gro_cells, skb);
+
+ rcu_read_unlock();
+
+ return 0;
+
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+ return 0;
+}
+
+/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
+static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
+{
+ struct vxlan_dev *vxlan;
+ struct vxlan_sock *vs;
+ struct vxlanhdr *hdr;
+ __be32 vni;
+
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
+ return -EINVAL;
+
+ hdr = vxlan_hdr(skb);
+
+ if (!(hdr->vx_flags & VXLAN_HF_VNI))
+ return -EINVAL;
+
+ vs = rcu_dereference_sk_user_data(sk);
+ if (!vs)
+ return -ENOENT;
+
+ vni = vxlan_vni(hdr->vx_vni);
+ vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
+ if (!vxlan)
+ return -ENOENT;
+
+ return 0;
+}
+
+static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct arphdr *parp;
+ u8 *arpptr, *sha;
+ __be32 sip, tip;
+ struct neighbour *n;
+
+ if (dev->flags & IFF_NOARP)
+ goto out;
+
+ if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
+ dev->stats.tx_dropped++;
+ goto out;
+ }
+ parp = arp_hdr(skb);
+
+ if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
+ parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
+ parp->ar_pro != htons(ETH_P_IP) ||
+ parp->ar_op != htons(ARPOP_REQUEST) ||
+ parp->ar_hln != dev->addr_len ||
+ parp->ar_pln != 4)
+ goto out;
+ arpptr = (u8 *)parp + sizeof(struct arphdr);
+ sha = arpptr;
+ arpptr += dev->addr_len; /* sha */
+ memcpy(&sip, arpptr, sizeof(sip));
+ arpptr += sizeof(sip);
+ arpptr += dev->addr_len; /* tha */
+ memcpy(&tip, arpptr, sizeof(tip));
+
+ if (ipv4_is_loopback(tip) ||
+ ipv4_is_multicast(tip))
+ goto out;
+
+ n = neigh_lookup(&arp_tbl, &tip, dev);
+
+ if (n) {
+ struct vxlan_fdb *f;
+ struct sk_buff *reply;
+
+ if (!(n->nud_state & NUD_CONNECTED)) {
+ neigh_release(n);
+ goto out;
+ }
+
+ f = vxlan_find_mac(vxlan, n->ha, vni);
+ if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
+ /* bridge-local neighbor */
+ neigh_release(n);
+ goto out;
+ }
+
+ reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
+ n->ha, sha);
+
+ neigh_release(n);
+
+ if (reply == NULL)
+ goto out;
+
+ skb_reset_mac_header(reply);
+ __skb_pull(reply, skb_network_offset(reply));
+ reply->ip_summed = CHECKSUM_UNNECESSARY;
+ reply->pkt_type = PACKET_HOST;
+
+ if (netif_rx_ni(reply) == NET_RX_DROP)
+ dev->stats.rx_dropped++;
+ } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
+ union vxlan_addr ipa = {
+ .sin.sin_addr.s_addr = tip,
+ .sin.sin_family = AF_INET,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ }
+out:
+ consume_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct sk_buff *vxlan_na_create(struct sk_buff *request,
+ struct neighbour *n, bool isrouter)
+{
+ struct net_device *dev = request->dev;
+ struct sk_buff *reply;
+ struct nd_msg *ns, *na;
+ struct ipv6hdr *pip6;
+ u8 *daddr;
+ int na_olen = 8; /* opt hdr + ETH_ALEN for target */
+ int ns_olen;
+ int i, len;
+
+ if (dev == NULL || !pskb_may_pull(request, request->len))
+ return NULL;
+
+ len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
+ sizeof(*na) + na_olen + dev->needed_tailroom;
+ reply = alloc_skb(len, GFP_ATOMIC);
+ if (reply == NULL)
+ return NULL;
+
+ reply->protocol = htons(ETH_P_IPV6);
+ reply->dev = dev;
+ skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
+ skb_push(reply, sizeof(struct ethhdr));
+ skb_reset_mac_header(reply);
+
+ ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
+
+ daddr = eth_hdr(request)->h_source;
+ ns_olen = request->len - skb_network_offset(request) -
+ sizeof(struct ipv6hdr) - sizeof(*ns);
+ for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
+ if (!ns->opt[i + 1]) {
+ kfree_skb(reply);
+ return NULL;
+ }
+ if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
+ daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
+ break;
+ }
+ }
+
+ /* Ethernet header */
+ ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
+ ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
+ eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
+ reply->protocol = htons(ETH_P_IPV6);
+
+ skb_pull(reply, sizeof(struct ethhdr));
+ skb_reset_network_header(reply);
+ skb_put(reply, sizeof(struct ipv6hdr));
+
+ /* IPv6 header */
+
+ pip6 = ipv6_hdr(reply);
+ memset(pip6, 0, sizeof(struct ipv6hdr));
+ pip6->version = 6;
+ pip6->priority = ipv6_hdr(request)->priority;
+ pip6->nexthdr = IPPROTO_ICMPV6;
+ pip6->hop_limit = 255;
+ pip6->daddr = ipv6_hdr(request)->saddr;
+ pip6->saddr = *(struct in6_addr *)n->primary_key;
+
+ skb_pull(reply, sizeof(struct ipv6hdr));
+ skb_reset_transport_header(reply);
+
+ /* Neighbor Advertisement */
+ na = skb_put_zero(reply, sizeof(*na) + na_olen);
+ na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
+ na->icmph.icmp6_router = isrouter;
+ na->icmph.icmp6_override = 1;
+ na->icmph.icmp6_solicited = 1;
+ na->target = ns->target;
+ ether_addr_copy(&na->opt[2], n->ha);
+ na->opt[0] = ND_OPT_TARGET_LL_ADDR;
+ na->opt[1] = na_olen >> 3;
+
+ na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
+ &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
+ csum_partial(na, sizeof(*na)+na_olen, 0));
+
+ pip6->payload_len = htons(sizeof(*na)+na_olen);
+
+ skb_push(reply, sizeof(struct ipv6hdr));
+
+ reply->ip_summed = CHECKSUM_UNNECESSARY;
+
+ return reply;
+}
+
+static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ const struct in6_addr *daddr;
+ const struct ipv6hdr *iphdr;
+ struct inet6_dev *in6_dev;
+ struct neighbour *n;
+ struct nd_msg *msg;
+
+ rcu_read_lock();
+ in6_dev = __in6_dev_get(dev);
+ if (!in6_dev)
+ goto out;
+
+ iphdr = ipv6_hdr(skb);
+ daddr = &iphdr->daddr;
+ msg = (struct nd_msg *)(iphdr + 1);
+
+ if (ipv6_addr_loopback(daddr) ||
+ ipv6_addr_is_multicast(&msg->target))
+ goto out;
+
+ n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
+
+ if (n) {
+ struct vxlan_fdb *f;
+ struct sk_buff *reply;
+
+ if (!(n->nud_state & NUD_CONNECTED)) {
+ neigh_release(n);
+ goto out;
+ }
+
+ f = vxlan_find_mac(vxlan, n->ha, vni);
+ if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
+ /* bridge-local neighbor */
+ neigh_release(n);
+ goto out;
+ }
+
+ reply = vxlan_na_create(skb, n,
+ !!(f ? f->flags & NTF_ROUTER : 0));
+
+ neigh_release(n);
+
+ if (reply == NULL)
+ goto out;
+
+ if (netif_rx_ni(reply) == NET_RX_DROP)
+ dev->stats.rx_dropped++;
+
+ } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
+ union vxlan_addr ipa = {
+ .sin6.sin6_addr = msg->target,
+ .sin6.sin6_family = AF_INET6,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ }
+
+out:
+ rcu_read_unlock();
+ consume_skb(skb);
+ return NETDEV_TX_OK;
+}
+#endif
+
+static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct neighbour *n;
+
+ if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
+ return false;
+
+ n = NULL;
+ switch (ntohs(eth_hdr(skb)->h_proto)) {
+ case ETH_P_IP:
+ {
+ struct iphdr *pip;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ return false;
+ pip = ip_hdr(skb);
+ n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
+ if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
+ union vxlan_addr ipa = {
+ .sin.sin_addr.s_addr = pip->daddr,
+ .sin.sin_family = AF_INET,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ return false;
+ }
+
+ break;
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ case ETH_P_IPV6:
+ {
+ struct ipv6hdr *pip6;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ return false;
+ pip6 = ipv6_hdr(skb);
+ n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
+ if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
+ union vxlan_addr ipa = {
+ .sin6.sin6_addr = pip6->daddr,
+ .sin6.sin6_family = AF_INET6,
+ };
+
+ vxlan_ip_miss(dev, &ipa);
+ return false;
+ }
+
+ break;
+ }
+#endif
+ default:
+ return false;
+ }
+
+ if (n) {
+ bool diff;
+
+ diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
+ if (diff) {
+ memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+ dev->addr_len);
+ memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
+ }
+ neigh_release(n);
+ return diff;
+ }
+
+ return false;
+}
+
+static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
+ struct vxlan_metadata *md)
+{
+ struct vxlanhdr_gbp *gbp;
+
+ if (!md->gbp)
+ return;
+
+ gbp = (struct vxlanhdr_gbp *)vxh;
+ vxh->vx_flags |= VXLAN_HF_GBP;
+
+ if (md->gbp & VXLAN_GBP_DONT_LEARN)
+ gbp->dont_learn = 1;
+
+ if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
+ gbp->policy_applied = 1;
+
+ gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
+}
+
+static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
+ __be16 protocol)
+{
+ struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
+
+ gpe->np_applied = 1;
+ gpe->next_protocol = tun_p_from_eth_p(protocol);
+ if (!gpe->next_protocol)
+ return -EPFNOSUPPORT;
+ return 0;
+}
+
+static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
+ int iphdr_len, __be32 vni,
+ struct vxlan_metadata *md, u32 vxflags,
+ bool udp_sum)
+{
+ struct vxlanhdr *vxh;
+ int min_headroom;
+ int err;
+ int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
+ __be16 inner_protocol = htons(ETH_P_TEB);
+
+ if ((vxflags & VXLAN_F_REMCSUM_TX) &&
+ skb->ip_summed == CHECKSUM_PARTIAL) {
+ int csum_start = skb_checksum_start_offset(skb);
+
+ if (csum_start <= VXLAN_MAX_REMCSUM_START &&
+ !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
+ (skb->csum_offset == offsetof(struct udphdr, check) ||
+ skb->csum_offset == offsetof(struct tcphdr, check)))
+ type |= SKB_GSO_TUNNEL_REMCSUM;
+ }
+
+ min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ + VXLAN_HLEN + iphdr_len;
+
+ /* Need space for new headers (invalidates iph ptr) */
+ err = skb_cow_head(skb, min_headroom);
+ if (unlikely(err))
+ return err;
+
+ err = iptunnel_handle_offloads(skb, type);
+ if (err)
+ return err;
+
+ vxh = __skb_push(skb, sizeof(*vxh));
+ vxh->vx_flags = VXLAN_HF_VNI;
+ vxh->vx_vni = vxlan_vni_field(vni);
+
+ if (type & SKB_GSO_TUNNEL_REMCSUM) {
+ unsigned int start;
+
+ start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
+ vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
+ vxh->vx_flags |= VXLAN_HF_RCO;
+
+ if (!skb_is_gso(skb)) {
+ skb->ip_summed = CHECKSUM_NONE;
+ skb->encapsulation = 0;
+ }
+ }
+
+ if (vxflags & VXLAN_F_GBP)
+ vxlan_build_gbp_hdr(vxh, vxflags, md);
+ if (vxflags & VXLAN_F_GPE) {
+ err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
+ if (err < 0)
+ return err;
+ inner_protocol = skb->protocol;
+ }
+
+ skb_set_inner_protocol(skb, inner_protocol);
+ return 0;
+}
+
+static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
+ struct vxlan_sock *sock4,
+ struct sk_buff *skb, int oif, u8 tos,
+ __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info)
+{
+ bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
+ struct rtable *rt = NULL;
+ struct flowi4 fl4;
+
+ if (!sock4)
+ return ERR_PTR(-EIO);
+
+ if (tos && !info)
+ use_cache = false;
+ if (use_cache) {
+ rt = dst_cache_get_ip4(dst_cache, saddr);
+ if (rt)
+ return rt;
+ }
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.flowi4_oif = oif;
+ fl4.flowi4_tos = RT_TOS(tos);
+ fl4.flowi4_mark = skb->mark;
+ fl4.flowi4_proto = IPPROTO_UDP;
+ fl4.daddr = daddr;
+ fl4.saddr = *saddr;
+ fl4.fl4_dport = dport;
+ fl4.fl4_sport = sport;
+
+ rt = ip_route_output_key(vxlan->net, &fl4);
+ if (!IS_ERR(rt)) {
+ if (rt->dst.dev == dev) {
+ netdev_dbg(dev, "circular route to %pI4\n", &daddr);
+ ip_rt_put(rt);
+ return ERR_PTR(-ELOOP);
+ }
+
+ *saddr = fl4.saddr;
+ if (use_cache)
+ dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
+ } else {
+ netdev_dbg(dev, "no route to %pI4\n", &daddr);
+ return ERR_PTR(-ENETUNREACH);
+ }
+ return rt;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
+ struct net_device *dev,
+ struct vxlan_sock *sock6,
+ struct sk_buff *skb, int oif, u8 tos,
+ __be32 label,
+ const struct in6_addr *daddr,
+ struct in6_addr *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info)
+{
+ bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
+ struct dst_entry *ndst;
+ struct flowi6 fl6;
+
+ if (!sock6)
+ return ERR_PTR(-EIO);
+
+ if (tos && !info)
+ use_cache = false;
+ if (use_cache) {
+ ndst = dst_cache_get_ip6(dst_cache, saddr);
+ if (ndst)
+ return ndst;
+ }
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = oif;
+ fl6.daddr = *daddr;
+ fl6.saddr = *saddr;
+ fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = IPPROTO_UDP;
+ fl6.fl6_dport = dport;
+ fl6.fl6_sport = sport;
+
+ ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
+ &fl6, NULL);
+ if (IS_ERR(ndst)) {
+ netdev_dbg(dev, "no route to %pI6\n", daddr);
+ return ERR_PTR(-ENETUNREACH);
+ }
+
+ if (unlikely(ndst->dev == dev)) {
+ netdev_dbg(dev, "circular route to %pI6\n", daddr);
+ dst_release(ndst);
+ return ERR_PTR(-ELOOP);
+ }
+
+ *saddr = fl6.saddr;
+ if (use_cache)
+ dst_cache_set_ip6(dst_cache, ndst, saddr);
+ return ndst;
+}
+#endif
+
+/* Bypass encapsulation if the destination is local */
+static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
+ struct vxlan_dev *dst_vxlan, __be32 vni,
+ bool snoop)
+{
+ struct pcpu_sw_netstats *tx_stats, *rx_stats;
+ union vxlan_addr loopback;
+ union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
+ struct net_device *dev;
+ int len = skb->len;
+
+ tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
+ rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
+ skb->pkt_type = PACKET_HOST;
+ skb->encapsulation = 0;
+ skb->dev = dst_vxlan->dev;
+ __skb_pull(skb, skb_network_offset(skb));
+
+ if (remote_ip->sa.sa_family == AF_INET) {
+ loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ loopback.sa.sa_family = AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ loopback.sin6.sin6_addr = in6addr_loopback;
+ loopback.sa.sa_family = AF_INET6;
+#endif
+ }
+
+ rcu_read_lock();
+ dev = skb->dev;
+ if (unlikely(!(dev->flags & IFF_UP))) {
+ kfree_skb(skb);
+ goto drop;
+ }
+
+ if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
+ vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
+
+ u64_stats_update_begin(&tx_stats->syncp);
+ tx_stats->tx_packets++;
+ tx_stats->tx_bytes += len;
+ u64_stats_update_end(&tx_stats->syncp);
+
+ if (__netif_rx(skb) == NET_RX_SUCCESS) {
+ u64_stats_update_begin(&rx_stats->syncp);
+ rx_stats->rx_packets++;
+ rx_stats->rx_bytes += len;
+ u64_stats_update_end(&rx_stats->syncp);
+ } else {
+drop:
+ dev->stats.rx_dropped++;
+ }
+ rcu_read_unlock();
+}
+
+static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
+ struct vxlan_dev *vxlan,
+ union vxlan_addr *daddr,
+ __be16 dst_port, int dst_ifindex, __be32 vni,
+ struct dst_entry *dst,
+ u32 rt_flags)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
+ * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
+ * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
+ */
+ BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
+#endif
+ /* Bypass encapsulation if the destination is local */
+ if (rt_flags & RTCF_LOCAL &&
+ !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+ struct vxlan_dev *dst_vxlan;
+
+ dst_release(dst);
+ dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
+ daddr->sa.sa_family, dst_port,
+ vxlan->cfg.flags);
+ if (!dst_vxlan) {
+ dev->stats.tx_errors++;
+ kfree_skb(skb);
+
+ return -ENOENT;
+ }
+ vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
+ __be32 default_vni, struct vxlan_rdst *rdst,
+ bool did_rsc)
+{
+ struct dst_cache *dst_cache;
+ struct ip_tunnel_info *info;
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ const struct iphdr *old_iph = ip_hdr(skb);
+ union vxlan_addr *dst;
+ union vxlan_addr remote_ip, local_ip;
+ struct vxlan_metadata _md;
+ struct vxlan_metadata *md = &_md;
+ __be16 src_port = 0, dst_port;
+ struct dst_entry *ndst = NULL;
+ __be32 vni, label;
+ __u8 tos, ttl;
+ int ifindex;
+ int err;
+ u32 flags = vxlan->cfg.flags;
+ bool udp_sum = false;
+ bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
+
+ info = skb_tunnel_info(skb);
+
+ if (rdst) {
+ dst = &rdst->remote_ip;
+ if (vxlan_addr_any(dst)) {
+ if (did_rsc) {
+ /* short-circuited back to local bridge */
+ vxlan_encap_bypass(skb, vxlan, vxlan,
+ default_vni, true);
+ return;
+ }
+ goto drop;
+ }
+
+ dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
+ vni = (rdst->remote_vni) ? : default_vni;
+ ifindex = rdst->remote_ifindex;
+ local_ip = vxlan->cfg.saddr;
+ dst_cache = &rdst->dst_cache;
+ md->gbp = skb->mark;
+ if (flags & VXLAN_F_TTL_INHERIT) {
+ ttl = ip_tunnel_get_ttl(old_iph, skb);
+ } else {
+ ttl = vxlan->cfg.ttl;
+ if (!ttl && vxlan_addr_multicast(dst))
+ ttl = 1;
+ }
+
+ tos = vxlan->cfg.tos;
+ if (tos == 1)
+ tos = ip_tunnel_get_dsfield(old_iph, skb);
+
+ if (dst->sa.sa_family == AF_INET)
+ udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
+ else
+ udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
+ label = vxlan->cfg.label;
+ } else {
+ if (!info) {
+ WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
+ dev->name);
+ goto drop;
+ }
+ remote_ip.sa.sa_family = ip_tunnel_info_af(info);
+ if (remote_ip.sa.sa_family == AF_INET) {
+ remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
+ local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
+ } else {
+ remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
+ local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
+ }
+ dst = &remote_ip;
+ dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
+ vni = tunnel_id_to_key32(info->key.tun_id);
+ ifindex = 0;
+ dst_cache = &info->dst_cache;
+ if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
+ if (info->options_len < sizeof(*md))
+ goto drop;
+ md = ip_tunnel_info_opts(info);
+ }
+ ttl = info->key.ttl;
+ tos = info->key.tos;
+ label = info->key.label;
+ udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
+ }
+ src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
+ vxlan->cfg.port_max, true);
+
+ rcu_read_lock();
+ if (dst->sa.sa_family == AF_INET) {
+ struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
+ struct rtable *rt;
+ __be16 df = 0;
+
+ if (!ifindex)
+ ifindex = sock4->sock->sk->sk_bound_dev_if;
+
+ rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
+ dst->sin.sin_addr.s_addr,
+ &local_ip.sin.sin_addr.s_addr,
+ dst_port, src_port,
+ dst_cache, info);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ goto tx_error;
+ }
+
+ if (!info) {
+ /* Bypass encapsulation if the destination is local */
+ err = encap_bypass_if_local(skb, dev, vxlan, dst,
+ dst_port, ifindex, vni,
+ &rt->dst, rt->rt_flags);
+ if (err)
+ goto out_unlock;
+
+ if (vxlan->cfg.df == VXLAN_DF_SET) {
+ df = htons(IP_DF);
+ } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
+ struct ethhdr *eth = eth_hdr(skb);
+
+ if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
+ (ntohs(eth->h_proto) == ETH_P_IP &&
+ old_iph->frag_off & htons(IP_DF)))
+ df = htons(IP_DF);
+ }
+ } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
+ df = htons(IP_DF);
+ }
+
+ ndst = &rt->dst;
+ err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
+ netif_is_any_bridge_port(dev));
+ if (err < 0) {
+ goto tx_error;
+ } else if (err) {
+ if (info) {
+ struct ip_tunnel_info *unclone;
+ struct in_addr src, dst;
+
+ unclone = skb_tunnel_info_unclone(skb);
+ if (unlikely(!unclone))
+ goto tx_error;
+
+ src = remote_ip.sin.sin_addr;
+ dst = local_ip.sin.sin_addr;
+ unclone->key.u.ipv4.src = src.s_addr;
+ unclone->key.u.ipv4.dst = dst.s_addr;
+ }
+ vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
+ dst_release(ndst);
+ goto out_unlock;
+ }
+
+ tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
+ ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
+ err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
+ vni, md, flags, udp_sum);
+ if (err < 0)
+ goto tx_error;
+
+ udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
+ dst->sin.sin_addr.s_addr, tos, ttl, df,
+ src_port, dst_port, xnet, !udp_sum);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
+
+ if (!ifindex)
+ ifindex = sock6->sock->sk->sk_bound_dev_if;
+
+ ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
+ label, &dst->sin6.sin6_addr,
+ &local_ip.sin6.sin6_addr,
+ dst_port, src_port,
+ dst_cache, info);
+ if (IS_ERR(ndst)) {
+ err = PTR_ERR(ndst);
+ ndst = NULL;
+ goto tx_error;
+ }
+
+ if (!info) {
+ u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
+
+ err = encap_bypass_if_local(skb, dev, vxlan, dst,
+ dst_port, ifindex, vni,
+ ndst, rt6i_flags);
+ if (err)
+ goto out_unlock;
+ }
+
+ err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
+ netif_is_any_bridge_port(dev));
+ if (err < 0) {
+ goto tx_error;
+ } else if (err) {
+ if (info) {
+ struct ip_tunnel_info *unclone;
+ struct in6_addr src, dst;
+
+ unclone = skb_tunnel_info_unclone(skb);
+ if (unlikely(!unclone))
+ goto tx_error;
+
+ src = remote_ip.sin6.sin6_addr;
+ dst = local_ip.sin6.sin6_addr;
+ unclone->key.u.ipv6.src = src;
+ unclone->key.u.ipv6.dst = dst;
+ }
+
+ vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
+ dst_release(ndst);
+ goto out_unlock;
+ }
+
+ tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
+ ttl = ttl ? : ip6_dst_hoplimit(ndst);
+ skb_scrub_packet(skb, xnet);
+ err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
+ vni, md, flags, udp_sum);
+ if (err < 0)
+ goto tx_error;
+
+ udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
+ &local_ip.sin6.sin6_addr,
+ &dst->sin6.sin6_addr, tos, ttl,
+ label, src_port, dst_port, !udp_sum);
+#endif
+ }
+out_unlock:
+ rcu_read_unlock();
+ return;
+
+drop:
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return;
+
+tx_error:
+ rcu_read_unlock();
+ if (err == -ELOOP)
+ dev->stats.collisions++;
+ else if (err == -ENETUNREACH)
+ dev->stats.tx_carrier_errors++;
+ dst_release(ndst);
+ dev->stats.tx_errors++;
+ kfree_skb(skb);
+}
+
+static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
+ struct vxlan_fdb *f, __be32 vni, bool did_rsc)
+{
+ struct vxlan_rdst nh_rdst;
+ struct nexthop *nh;
+ bool do_xmit;
+ u32 hash;
+
+ memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
+ hash = skb_get_hash(skb);
+
+ rcu_read_lock();
+ nh = rcu_dereference(f->nh);
+ if (!nh) {
+ rcu_read_unlock();
+ goto drop;
+ }
+ do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
+ rcu_read_unlock();
+
+ if (likely(do_xmit))
+ vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
+ else
+ goto drop;
+
+ return;
+
+drop:
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+}
+
+/* Transmit local packets over Vxlan
+ *
+ * Outer IP header inherits ECN and DF from inner header.
+ * Outer UDP destination is the VXLAN assigned port.
+ * source port is based on hash of flow
+ */
+static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *rdst, *fdst = NULL;
+ const struct ip_tunnel_info *info;
+ bool did_rsc = false;
+ struct vxlan_fdb *f;
+ struct ethhdr *eth;
+ __be32 vni = 0;
+
+ info = skb_tunnel_info(skb);
+
+ skb_reset_mac_header(skb);
+
+ if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
+ if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
+ info->mode & IP_TUNNEL_INFO_TX) {
+ vni = tunnel_id_to_key32(info->key.tun_id);
+ } else {
+ if (info && info->mode & IP_TUNNEL_INFO_TX)
+ vxlan_xmit_one(skb, dev, vni, NULL, false);
+ else
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ }
+
+ if (vxlan->cfg.flags & VXLAN_F_PROXY) {
+ eth = eth_hdr(skb);
+ if (ntohs(eth->h_proto) == ETH_P_ARP)
+ return arp_reduce(dev, skb, vni);
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
+ pskb_may_pull(skb, sizeof(struct ipv6hdr) +
+ sizeof(struct nd_msg)) &&
+ ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
+ struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
+
+ if (m->icmph.icmp6_code == 0 &&
+ m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
+ return neigh_reduce(dev, skb, vni);
+ }
+#endif
+ }
+
+ eth = eth_hdr(skb);
+ f = vxlan_find_mac(vxlan, eth->h_dest, vni);
+ did_rsc = false;
+
+ if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
+ (ntohs(eth->h_proto) == ETH_P_IP ||
+ ntohs(eth->h_proto) == ETH_P_IPV6)) {
+ did_rsc = route_shortcircuit(dev, skb);
+ if (did_rsc)
+ f = vxlan_find_mac(vxlan, eth->h_dest, vni);
+ }
+
+ if (f == NULL) {
+ f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
+ if (f == NULL) {
+ if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
+ !is_multicast_ether_addr(eth->h_dest))
+ vxlan_fdb_miss(vxlan, eth->h_dest);
+
+ dev->stats.tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ }
+
+ if (rcu_access_pointer(f->nh)) {
+ vxlan_xmit_nh(skb, dev, f,
+ (vni ? : vxlan->default_dst.remote_vni), did_rsc);
+ } else {
+ list_for_each_entry_rcu(rdst, &f->remotes, list) {
+ struct sk_buff *skb1;
+
+ if (!fdst) {
+ fdst = rdst;
+ continue;
+ }
+ skb1 = skb_clone(skb, GFP_ATOMIC);
+ if (skb1)
+ vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
+ }
+ if (fdst)
+ vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
+ else
+ kfree_skb(skb);
+ }
+
+ return NETDEV_TX_OK;
+}
+
+/* Walk the forwarding table and purge stale entries */
+static void vxlan_cleanup(struct timer_list *t)
+{
+ struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
+ unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
+ unsigned int h;
+
+ if (!netif_running(vxlan->dev))
+ return;
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ struct hlist_node *p, *n;
+
+ spin_lock(&vxlan->hash_lock[h]);
+ hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
+ struct vxlan_fdb *f
+ = container_of(p, struct vxlan_fdb, hlist);
+ unsigned long timeout;
+
+ if (f->state & (NUD_PERMANENT | NUD_NOARP))
+ continue;
+
+ if (f->flags & NTF_EXT_LEARNED)
+ continue;
+
+ timeout = f->used + vxlan->cfg.age_interval * HZ;
+ if (time_before_eq(timeout, jiffies)) {
+ netdev_dbg(vxlan->dev,
+ "garbage collect %pM\n",
+ f->eth_addr);
+ f->state = NUD_STALE;
+ vxlan_fdb_destroy(vxlan, f, true, true);
+ } else if (time_before(timeout, next_timer))
+ next_timer = timeout;
+ }
+ spin_unlock(&vxlan->hash_lock[h]);
+ }
+
+ mod_timer(&vxlan->age_timer, next_timer);
+}
+
+static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
+{
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+
+ spin_lock(&vn->sock_lock);
+ hlist_del_init_rcu(&vxlan->hlist4.hlist);
+#if IS_ENABLED(CONFIG_IPV6)
+ hlist_del_init_rcu(&vxlan->hlist6.hlist);
+#endif
+ spin_unlock(&vn->sock_lock);
+}
+
+static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
+ struct vxlan_dev_node *node)
+{
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+ __be32 vni = vxlan->default_dst.remote_vni;
+
+ node->vxlan = vxlan;
+ spin_lock(&vn->sock_lock);
+ hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
+ spin_unlock(&vn->sock_lock);
+}
+
+/* Setup stats when device is created */
+static int vxlan_init(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ int err;
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ err = gro_cells_init(&vxlan->gro_cells, dev);
+ if (err) {
+ free_percpu(dev->tstats);
+ return err;
+ }
+
+ return 0;
+}
+
+static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
+{
+ struct vxlan_fdb *f;
+ u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
+
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+ f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
+ if (f)
+ vxlan_fdb_destroy(vxlan, f, true, true);
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+}
+
+static void vxlan_uninit(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+
+ gro_cells_destroy(&vxlan->gro_cells);
+
+ vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
+
+ free_percpu(dev->tstats);
+}
+
+/* Start ageing timer and join group when device is brought up */
+static int vxlan_open(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ int ret;
+
+ ret = vxlan_sock_add(vxlan);
+ if (ret < 0)
+ return ret;
+
+ if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
+ ret = vxlan_igmp_join(vxlan);
+ if (ret == -EADDRINUSE)
+ ret = 0;
+ if (ret) {
+ vxlan_sock_release(vxlan);
+ return ret;
+ }
+ }
+
+ if (vxlan->cfg.age_interval)
+ mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
+
+ return ret;
+}
+
+/* Purge the forwarding table */
+static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
+{
+ unsigned int h;
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ struct hlist_node *p, *n;
+
+ spin_lock_bh(&vxlan->hash_lock[h]);
+ hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
+ struct vxlan_fdb *f
+ = container_of(p, struct vxlan_fdb, hlist);
+ if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
+ continue;
+ /* the all_zeros_mac entry is deleted at vxlan_uninit */
+ if (is_zero_ether_addr(f->eth_addr) &&
+ f->vni == vxlan->cfg.vni)
+ continue;
+ vxlan_fdb_destroy(vxlan, f, true, true);
+ }
+ spin_unlock_bh(&vxlan->hash_lock[h]);
+ }
+}
+
+/* Cleanup timer and forwarding table on shutdown */
+static int vxlan_stop(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+ int ret = 0;
+
+ if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
+ !vxlan_group_used(vn, vxlan))
+ ret = vxlan_igmp_leave(vxlan);
+
+ del_timer_sync(&vxlan->age_timer);
+
+ vxlan_flush(vxlan, false);
+ vxlan_sock_release(vxlan);
+
+ return ret;
+}
+
+/* Stub, nothing needs to be done. */
+static void vxlan_set_multicast_list(struct net_device *dev)
+{
+}
+
+static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+ struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
+ dst->remote_ifindex);
+ bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
+
+ /* This check is different than dev->max_mtu, because it looks at
+ * the lowerdev->mtu, rather than the static dev->max_mtu
+ */
+ if (lowerdev) {
+ int max_mtu = lowerdev->mtu -
+ (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+ if (new_mtu > max_mtu)
+ return -EINVAL;
+ }
+
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct ip_tunnel_info *info = skb_tunnel_info(skb);
+ __be16 sport, dport;
+
+ sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
+ vxlan->cfg.port_max, true);
+ dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
+
+ if (ip_tunnel_info_af(info) == AF_INET) {
+ struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
+ struct rtable *rt;
+
+ rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
+ info->key.u.ipv4.dst,
+ &info->key.u.ipv4.src, dport, sport,
+ &info->dst_cache, info);
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+ ip_rt_put(rt);
+ } else {
+#if IS_ENABLED(CONFIG_IPV6)
+ struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
+ struct dst_entry *ndst;
+
+ ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
+ info->key.label, &info->key.u.ipv6.dst,
+ &info->key.u.ipv6.src, dport, sport,
+ &info->dst_cache, info);
+ if (IS_ERR(ndst))
+ return PTR_ERR(ndst);
+ dst_release(ndst);
+#else /* !CONFIG_IPV6 */
+ return -EPFNOSUPPORT;
+#endif
+ }
+ info->key.tp_src = sport;
+ info->key.tp_dst = dport;
+ return 0;
+}
+
+static const struct net_device_ops vxlan_netdev_ether_ops = {
+ .ndo_init = vxlan_init,
+ .ndo_uninit = vxlan_uninit,
+ .ndo_open = vxlan_open,
+ .ndo_stop = vxlan_stop,
+ .ndo_start_xmit = vxlan_xmit,
+ .ndo_get_stats64 = dev_get_tstats64,
+ .ndo_set_rx_mode = vxlan_set_multicast_list,
+ .ndo_change_mtu = vxlan_change_mtu,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_fdb_add = vxlan_fdb_add,
+ .ndo_fdb_del = vxlan_fdb_delete,
+ .ndo_fdb_dump = vxlan_fdb_dump,
+ .ndo_fdb_get = vxlan_fdb_get,
+ .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
+};
+
+static const struct net_device_ops vxlan_netdev_raw_ops = {
+ .ndo_init = vxlan_init,
+ .ndo_uninit = vxlan_uninit,
+ .ndo_open = vxlan_open,
+ .ndo_stop = vxlan_stop,
+ .ndo_start_xmit = vxlan_xmit,
+ .ndo_get_stats64 = dev_get_tstats64,
+ .ndo_change_mtu = vxlan_change_mtu,
+ .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type vxlan_type = {
+ .name = "vxlan",
+};
+
+/* Calls the ndo_udp_tunnel_add of the caller in order to
+ * supply the listening VXLAN udp ports. Callers are expected
+ * to implement the ndo_udp_tunnel_add.
+ */
+static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
+{
+ struct vxlan_sock *vs;
+ struct net *net = dev_net(dev);
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ unsigned int i;
+
+ spin_lock(&vn->sock_lock);
+ for (i = 0; i < PORT_HASH_SIZE; ++i) {
+ hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
+ unsigned short type;
+
+ if (vs->flags & VXLAN_F_GPE)
+ type = UDP_TUNNEL_TYPE_VXLAN_GPE;
+ else
+ type = UDP_TUNNEL_TYPE_VXLAN;
+
+ if (push)
+ udp_tunnel_push_rx_port(dev, vs->sock, type);
+ else
+ udp_tunnel_drop_rx_port(dev, vs->sock, type);
+ }
+ }
+ spin_unlock(&vn->sock_lock);
+}
+
+/* Initialize the device structure. */
+static void vxlan_setup(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ unsigned int h;
+
+ eth_hw_addr_random(dev);
+ ether_setup(dev);
+
+ dev->needs_free_netdev = true;
+ SET_NETDEV_DEVTYPE(dev, &vxlan_type);
+
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
+ dev->features |= NETIF_F_RXCSUM;
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+
+ dev->vlan_features = dev->features;
+ dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
+ dev->hw_features |= NETIF_F_RXCSUM;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ netif_keep_dst(dev);
+ dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
+
+ /* MTU range: 68 - 65535 */
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = ETH_MAX_MTU;
+
+ INIT_LIST_HEAD(&vxlan->next);
+
+ timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
+
+ vxlan->dev = dev;
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ spin_lock_init(&vxlan->hash_lock[h]);
+ INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
+ }
+}
+
+static void vxlan_ether_setup(struct net_device *dev)
+{
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ dev->netdev_ops = &vxlan_netdev_ether_ops;
+}
+
+static void vxlan_raw_setup(struct net_device *dev)
+{
+ dev->header_ops = NULL;
+ dev->type = ARPHRD_NONE;
+ dev->hard_header_len = 0;
+ dev->addr_len = 0;
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+ dev->netdev_ops = &vxlan_netdev_raw_ops;
+}
+
+static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
+ [IFLA_VXLAN_ID] = { .type = NLA_U32 },
+ [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
+ [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
+ [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
+ [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
+ [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
+ [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
+ [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
+ [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
+ [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
+ [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
+ [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
+ [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
+ [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
+ [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
+ [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
+ [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
+ [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
+ [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
+ [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
+ [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
+ [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
+ [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
+ [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
+ [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
+ [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
+ [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
+ [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
+ [IFLA_VXLAN_DF] = { .type = NLA_U8 },
+};
+
+static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ if (tb[IFLA_ADDRESS]) {
+ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+ "Provided link layer address is not Ethernet");
+ return -EINVAL;
+ }
+
+ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+ "Provided Ethernet address is not unicast");
+ return -EADDRNOTAVAIL;
+ }
+ }
+
+ if (tb[IFLA_MTU]) {
+ u32 mtu = nla_get_u32(tb[IFLA_MTU]);
+
+ if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
+ "MTU must be between 68 and 65535");
+ return -EINVAL;
+ }
+ }
+
+ if (!data) {
+ NL_SET_ERR_MSG(extack,
+ "Required attributes not provided to perform the operation");
+ return -EINVAL;
+ }
+
+ if (data[IFLA_VXLAN_ID]) {
+ u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
+
+ if (id >= VXLAN_N_VID) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
+ "VXLAN ID must be lower than 16777216");
+ return -ERANGE;
+ }
+ }
+
+ if (data[IFLA_VXLAN_PORT_RANGE]) {
+ const struct ifla_vxlan_port_range *p
+ = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
+
+ if (ntohs(p->high) < ntohs(p->low)) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
+ "Invalid source port range");
+ return -EINVAL;
+ }
+ }
+
+ if (data[IFLA_VXLAN_DF]) {
+ enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
+
+ if (df < 0 || df > VXLAN_DF_MAX) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
+ "Invalid DF attribute");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static void vxlan_get_drvinfo(struct net_device *netdev,
+ struct ethtool_drvinfo *drvinfo)
+{
+ strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
+ strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
+}
+
+static int vxlan_get_link_ksettings(struct net_device *dev,
+ struct ethtool_link_ksettings *cmd)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+ struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
+ dst->remote_ifindex);
+
+ if (!lowerdev) {
+ cmd->base.duplex = DUPLEX_UNKNOWN;
+ cmd->base.port = PORT_OTHER;
+ cmd->base.speed = SPEED_UNKNOWN;
+
+ return 0;
+ }
+
+ return __ethtool_get_link_ksettings(lowerdev, cmd);
+}
+
+static const struct ethtool_ops vxlan_ethtool_ops = {
+ .get_drvinfo = vxlan_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_link_ksettings = vxlan_get_link_ksettings,
+};
+
+static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
+ __be16 port, u32 flags, int ifindex)
+{
+ struct socket *sock;
+ struct udp_port_cfg udp_conf;
+ int err;
+
+ memset(&udp_conf, 0, sizeof(udp_conf));
+
+ if (ipv6) {
+ udp_conf.family = AF_INET6;
+ udp_conf.use_udp6_rx_checksums =
+ !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
+ udp_conf.ipv6_v6only = 1;
+ } else {
+ udp_conf.family = AF_INET;
+ }
+
+ udp_conf.local_udp_port = port;
+ udp_conf.bind_ifindex = ifindex;
+
+ /* Open UDP socket */
+ err = udp_sock_create(net, &udp_conf, &sock);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ udp_allow_gso(sock->sk);
+ return sock;
+}
+
+/* Create new listen socket if needed */
+static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
+ __be16 port, u32 flags,
+ int ifindex)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ struct vxlan_sock *vs;
+ struct socket *sock;
+ unsigned int h;
+ struct udp_tunnel_sock_cfg tunnel_cfg;
+
+ vs = kzalloc(sizeof(*vs), GFP_KERNEL);
+ if (!vs)
+ return ERR_PTR(-ENOMEM);
+
+ for (h = 0; h < VNI_HASH_SIZE; ++h)
+ INIT_HLIST_HEAD(&vs->vni_list[h]);
+
+ sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
+ if (IS_ERR(sock)) {
+ kfree(vs);
+ return ERR_CAST(sock);
+ }
+
+ vs->sock = sock;
+ refcount_set(&vs->refcnt, 1);
+ vs->flags = (flags & VXLAN_F_RCV_FLAGS);
+
+ spin_lock(&vn->sock_lock);
+ hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
+ udp_tunnel_notify_add_rx_port(sock,
+ (vs->flags & VXLAN_F_GPE) ?
+ UDP_TUNNEL_TYPE_VXLAN_GPE :
+ UDP_TUNNEL_TYPE_VXLAN);
+ spin_unlock(&vn->sock_lock);
+
+ /* Mark socket as an encapsulation socket. */
+ memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
+ tunnel_cfg.sk_user_data = vs;
+ tunnel_cfg.encap_type = 1;
+ tunnel_cfg.encap_rcv = vxlan_rcv;
+ tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
+ tunnel_cfg.encap_destroy = NULL;
+ tunnel_cfg.gro_receive = vxlan_gro_receive;
+ tunnel_cfg.gro_complete = vxlan_gro_complete;
+
+ setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
+
+ return vs;
+}
+
+static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
+{
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+ struct vxlan_sock *vs = NULL;
+ struct vxlan_dev_node *node;
+ int l3mdev_index = 0;
+
+ if (vxlan->cfg.remote_ifindex)
+ l3mdev_index = l3mdev_master_upper_ifindex_by_index(
+ vxlan->net, vxlan->cfg.remote_ifindex);
+
+ if (!vxlan->cfg.no_share) {
+ spin_lock(&vn->sock_lock);
+ vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
+ vxlan->cfg.dst_port, vxlan->cfg.flags,
+ l3mdev_index);
+ if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
+ spin_unlock(&vn->sock_lock);
+ return -EBUSY;
+ }
+ spin_unlock(&vn->sock_lock);
+ }
+ if (!vs)
+ vs = vxlan_socket_create(vxlan->net, ipv6,
+ vxlan->cfg.dst_port, vxlan->cfg.flags,
+ l3mdev_index);
+ if (IS_ERR(vs))
+ return PTR_ERR(vs);
+#if IS_ENABLED(CONFIG_IPV6)
+ if (ipv6) {
+ rcu_assign_pointer(vxlan->vn6_sock, vs);
+ node = &vxlan->hlist6;
+ } else
+#endif
+ {
+ rcu_assign_pointer(vxlan->vn4_sock, vs);
+ node = &vxlan->hlist4;
+ }
+ vxlan_vs_add_dev(vs, vxlan, node);
+ return 0;
+}
+
+static int vxlan_sock_add(struct vxlan_dev *vxlan)
+{
+ bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
+ bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
+ bool ipv4 = !ipv6 || metadata;
+ int ret = 0;
+
+ RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
+#if IS_ENABLED(CONFIG_IPV6)
+ RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
+ if (ipv6) {
+ ret = __vxlan_sock_add(vxlan, true);
+ if (ret < 0 && ret != -EAFNOSUPPORT)
+ ipv4 = false;
+ }
+#endif
+ if (ipv4)
+ ret = __vxlan_sock_add(vxlan, false);
+ if (ret < 0)
+ vxlan_sock_release(vxlan);
+ return ret;
+}
+
+static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
+ struct net_device **lower,
+ struct vxlan_dev *old,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
+ struct vxlan_dev *tmp;
+ bool use_ipv6 = false;
+
+ if (conf->flags & VXLAN_F_GPE) {
+ /* For now, allow GPE only together with
+ * COLLECT_METADATA. This can be relaxed later; in such
+ * case, the other side of the PtP link will have to be
+ * provided.
+ */
+ if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
+ !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
+ NL_SET_ERR_MSG(extack,
+ "VXLAN GPE does not support this combination of attributes");
+ return -EINVAL;
+ }
+ }
+
+ if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
+ /* Unless IPv6 is explicitly requested, assume IPv4 */
+ conf->remote_ip.sa.sa_family = AF_INET;
+ conf->saddr.sa.sa_family = AF_INET;
+ } else if (!conf->remote_ip.sa.sa_family) {
+ conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
+ } else if (!conf->saddr.sa.sa_family) {
+ conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
+ }
+
+ if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
+ NL_SET_ERR_MSG(extack,
+ "Local and remote address must be from the same family");
+ return -EINVAL;
+ }
+
+ if (vxlan_addr_multicast(&conf->saddr)) {
+ NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
+ return -EINVAL;
+ }
+
+ if (conf->saddr.sa.sa_family == AF_INET6) {
+ if (!IS_ENABLED(CONFIG_IPV6)) {
+ NL_SET_ERR_MSG(extack,
+ "IPv6 support not enabled in the kernel");
+ return -EPFNOSUPPORT;
+ }
+ use_ipv6 = true;
+ conf->flags |= VXLAN_F_IPV6;
+
+ if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
+ int local_type =
+ ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
+ int remote_type =
+ ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
+
+ if (local_type & IPV6_ADDR_LINKLOCAL) {
+ if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
+ (remote_type != IPV6_ADDR_ANY)) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid combination of local and remote address scopes");
+ return -EINVAL;
+ }
+
+ conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
+ } else {
+ if (remote_type ==
+ (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid combination of local and remote address scopes");
+ return -EINVAL;
+ }
+
+ conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
+ }
+ }
+ }
+
+ if (conf->label && !use_ipv6) {
+ NL_SET_ERR_MSG(extack,
+ "Label attribute only applies to IPv6 VXLAN devices");
+ return -EINVAL;
+ }
+
+ if (conf->remote_ifindex) {
+ struct net_device *lowerdev;
+
+ lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
+ if (!lowerdev) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid local interface, device not found");
+ return -ENODEV;
+ }
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (use_ipv6) {
+ struct inet6_dev *idev = __in6_dev_get(lowerdev);
+
+ if (idev && idev->cnf.disable_ipv6) {
+ NL_SET_ERR_MSG(extack,
+ "IPv6 support disabled by administrator");
+ return -EPERM;
+ }
+ }
+#endif
+
+ *lower = lowerdev;
+ } else {
+ if (vxlan_addr_multicast(&conf->remote_ip)) {
+ NL_SET_ERR_MSG(extack,
+ "Local interface required for multicast remote destination");
+
+ return -EINVAL;
+ }
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
+ NL_SET_ERR_MSG(extack,
+ "Local interface required for link-local local/remote addresses");
+ return -EINVAL;
+ }
+#endif
+
+ *lower = NULL;
+ }
+
+ if (!conf->dst_port) {
+ if (conf->flags & VXLAN_F_GPE)
+ conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
+ else
+ conf->dst_port = htons(vxlan_port);
+ }
+
+ if (!conf->age_interval)
+ conf->age_interval = FDB_AGE_DEFAULT;
+
+ list_for_each_entry(tmp, &vn->vxlan_list, next) {
+ if (tmp == old)
+ continue;
+
+ if (tmp->cfg.vni != conf->vni)
+ continue;
+ if (tmp->cfg.dst_port != conf->dst_port)
+ continue;
+ if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
+ (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
+ continue;
+
+ if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
+ tmp->cfg.remote_ifindex != conf->remote_ifindex)
+ continue;
+
+ NL_SET_ERR_MSG(extack,
+ "A VXLAN device with the specified VNI already exists");
+ return -EEXIST;
+ }
+
+ return 0;
+}
+
+static void vxlan_config_apply(struct net_device *dev,
+ struct vxlan_config *conf,
+ struct net_device *lowerdev,
+ struct net *src_net,
+ bool changelink)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+ unsigned short needed_headroom = ETH_HLEN;
+ bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
+ int max_mtu = ETH_MAX_MTU;
+
+ if (!changelink) {
+ if (conf->flags & VXLAN_F_GPE)
+ vxlan_raw_setup(dev);
+ else
+ vxlan_ether_setup(dev);
+
+ if (conf->mtu)
+ dev->mtu = conf->mtu;
+
+ vxlan->net = src_net;
+ }
+
+ dst->remote_vni = conf->vni;
+
+ memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
+
+ if (lowerdev) {
+ dst->remote_ifindex = conf->remote_ifindex;
+
+ netif_set_gso_max_size(dev, lowerdev->gso_max_size);
+ netif_set_gso_max_segs(dev, lowerdev->gso_max_segs);
+
+ needed_headroom = lowerdev->hard_header_len;
+ needed_headroom += lowerdev->needed_headroom;
+
+ dev->needed_tailroom = lowerdev->needed_tailroom;
+
+ max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
+ VXLAN_HEADROOM);
+ if (max_mtu < ETH_MIN_MTU)
+ max_mtu = ETH_MIN_MTU;
+
+ if (!changelink && !conf->mtu)
+ dev->mtu = max_mtu;
+ }
+
+ if (dev->mtu > max_mtu)
+ dev->mtu = max_mtu;
+
+ if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
+ needed_headroom += VXLAN6_HEADROOM;
+ else
+ needed_headroom += VXLAN_HEADROOM;
+ dev->needed_headroom = needed_headroom;
+
+ memcpy(&vxlan->cfg, conf, sizeof(*conf));
+}
+
+static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
+ struct vxlan_config *conf, bool changelink,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct net_device *lowerdev;
+ int ret;
+
+ ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
+ if (ret)
+ return ret;
+
+ vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
+
+ return 0;
+}
+
+static int __vxlan_dev_create(struct net *net, struct net_device *dev,
+ struct vxlan_config *conf,
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct net_device *remote_dev = NULL;
+ struct vxlan_fdb *f = NULL;
+ bool unregister = false;
+ struct vxlan_rdst *dst;
+ int err;
+
+ dst = &vxlan->default_dst;
+ err = vxlan_dev_configure(net, dev, conf, false, extack);
+ if (err)
+ return err;
+
+ dev->ethtool_ops = &vxlan_ethtool_ops;
+
+ /* create an fdb entry for a valid default destination */
+ if (!vxlan_addr_any(&dst->remote_ip)) {
+ err = vxlan_fdb_create(vxlan, all_zeros_mac,
+ &dst->remote_ip,
+ NUD_REACHABLE | NUD_PERMANENT,
+ vxlan->cfg.dst_port,
+ dst->remote_vni,
+ dst->remote_vni,
+ dst->remote_ifindex,
+ NTF_SELF, 0, &f, extack);
+ if (err)
+ return err;
+ }
+
+ err = register_netdevice(dev);
+ if (err)
+ goto errout;
+ unregister = true;
+
+ if (dst->remote_ifindex) {
+ remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
+ if (!remote_dev) {
+ err = -ENODEV;
+ goto errout;
+ }
+
+ err = netdev_upper_dev_link(remote_dev, dev, extack);
+ if (err)
+ goto errout;
+ }
+
+ err = rtnl_configure_link(dev, NULL);
+ if (err < 0)
+ goto unlink;
+
+ if (f) {
+ vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
+
+ /* notify default fdb entry */
+ err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
+ RTM_NEWNEIGH, true, extack);
+ if (err) {
+ vxlan_fdb_destroy(vxlan, f, false, false);
+ if (remote_dev)
+ netdev_upper_dev_unlink(remote_dev, dev);
+ goto unregister;
+ }
+ }
+
+ list_add(&vxlan->next, &vn->vxlan_list);
+ if (remote_dev)
+ dst->remote_dev = remote_dev;
+ return 0;
+unlink:
+ if (remote_dev)
+ netdev_upper_dev_unlink(remote_dev, dev);
+errout:
+ /* unregister_netdevice() destroys the default FDB entry with deletion
+ * notification. But the addition notification was not sent yet, so
+ * destroy the entry by hand here.
+ */
+ if (f)
+ __vxlan_fdb_free(f);
+unregister:
+ if (unregister)
+ unregister_netdevice(dev);
+ return err;
+}
+
+/* Set/clear flags based on attribute */
+static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
+ int attrtype, unsigned long mask, bool changelink,
+ bool changelink_supported,
+ struct netlink_ext_ack *extack)
+{
+ unsigned long flags;
+
+ if (!tb[attrtype])
+ return 0;
+
+ if (changelink && !changelink_supported) {
+ vxlan_flag_attr_error(attrtype, extack);
+ return -EOPNOTSUPP;
+ }
+
+ if (vxlan_policy[attrtype].type == NLA_FLAG)
+ flags = conf->flags | mask;
+ else if (nla_get_u8(tb[attrtype]))
+ flags = conf->flags | mask;
+ else
+ flags = conf->flags & ~mask;
+
+ conf->flags = flags;
+
+ return 0;
+}
+
+static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
+ struct net_device *dev, struct vxlan_config *conf,
+ bool changelink, struct netlink_ext_ack *extack)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ int err = 0;
+
+ memset(conf, 0, sizeof(*conf));
+
+ /* if changelink operation, start with old existing cfg */
+ if (changelink)
+ memcpy(conf, &vxlan->cfg, sizeof(*conf));
+
+ if (data[IFLA_VXLAN_ID]) {
+ __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
+
+ if (changelink && (vni != conf->vni)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
+ return -EOPNOTSUPP;
+ }
+ conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
+ }
+
+ if (data[IFLA_VXLAN_GROUP]) {
+ if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
+ return -EOPNOTSUPP;
+ }
+
+ conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
+ conf->remote_ip.sa.sa_family = AF_INET;
+ } else if (data[IFLA_VXLAN_GROUP6]) {
+ if (!IS_ENABLED(CONFIG_IPV6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
+ return -EPFNOSUPPORT;
+ }
+
+ if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
+ return -EOPNOTSUPP;
+ }
+
+ conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
+ conf->remote_ip.sa.sa_family = AF_INET6;
+ }
+
+ if (data[IFLA_VXLAN_LOCAL]) {
+ if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
+ return -EOPNOTSUPP;
+ }
+
+ conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
+ conf->saddr.sa.sa_family = AF_INET;
+ } else if (data[IFLA_VXLAN_LOCAL6]) {
+ if (!IS_ENABLED(CONFIG_IPV6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
+ return -EPFNOSUPPORT;
+ }
+
+ if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
+ return -EOPNOTSUPP;
+ }
+
+ /* TODO: respect scope id */
+ conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
+ conf->saddr.sa.sa_family = AF_INET6;
+ }
+
+ if (data[IFLA_VXLAN_LINK])
+ conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
+
+ if (data[IFLA_VXLAN_TOS])
+ conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
+
+ if (data[IFLA_VXLAN_TTL])
+ conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
+
+ if (data[IFLA_VXLAN_TTL_INHERIT]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
+ VXLAN_F_TTL_INHERIT, changelink, false,
+ extack);
+ if (err)
+ return err;
+
+ }
+
+ if (data[IFLA_VXLAN_LABEL])
+ conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
+ IPV6_FLOWLABEL_MASK;
+
+ if (data[IFLA_VXLAN_LEARNING]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
+ VXLAN_F_LEARN, changelink, true,
+ extack);
+ if (err)
+ return err;
+ } else if (!changelink) {
+ /* default to learn on a new device */
+ conf->flags |= VXLAN_F_LEARN;
+ }
+
+ if (data[IFLA_VXLAN_AGEING])
+ conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
+
+ if (data[IFLA_VXLAN_PROXY]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
+ VXLAN_F_PROXY, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_RSC]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
+ VXLAN_F_RSC, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_L2MISS]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
+ VXLAN_F_L2MISS, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_L3MISS]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
+ VXLAN_F_L3MISS, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_LIMIT]) {
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
+ "Cannot change limit");
+ return -EOPNOTSUPP;
+ }
+ conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
+ }
+
+ if (data[IFLA_VXLAN_COLLECT_METADATA]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
+ VXLAN_F_COLLECT_METADATA, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_PORT_RANGE]) {
+ if (!changelink) {
+ const struct ifla_vxlan_port_range *p
+ = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
+ conf->port_min = ntohs(p->low);
+ conf->port_max = ntohs(p->high);
+ } else {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
+ "Cannot change port range");
+ return -EOPNOTSUPP;
+ }
+ }
+
+ if (data[IFLA_VXLAN_PORT]) {
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
+ "Cannot change port");
+ return -EOPNOTSUPP;
+ }
+ conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
+ }
+
+ if (data[IFLA_VXLAN_UDP_CSUM]) {
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
+ "Cannot change UDP_CSUM flag");
+ return -EOPNOTSUPP;
+ }
+ if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
+ conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
+ }
+
+ if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
+ VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
+ false, extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
+ VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
+ false, extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_REMCSUM_TX]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
+ VXLAN_F_REMCSUM_TX, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_REMCSUM_RX]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
+ VXLAN_F_REMCSUM_RX, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_GBP]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
+ VXLAN_F_GBP, changelink, false, extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_GPE]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
+ VXLAN_F_GPE, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
+
+ if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
+ VXLAN_F_REMCSUM_NOPARTIAL, changelink,
+ false, extack);
+ if (err)
+ return err;
+ }
+
+ if (tb[IFLA_MTU]) {
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
+ "Cannot change mtu");
+ return -EOPNOTSUPP;
+ }
+ conf->mtu = nla_get_u32(tb[IFLA_MTU]);
+ }
+
+ if (data[IFLA_VXLAN_DF])
+ conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
+
+ return 0;
+}
+
+static int vxlan_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_config conf;
+ int err;
+
+ err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
+ if (err)
+ return err;
+
+ return __vxlan_dev_create(src_net, dev, &conf, extack);
+}
+
+static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct net_device *lowerdev;
+ struct vxlan_config conf;
+ struct vxlan_rdst *dst;
+ int err;
+
+ dst = &vxlan->default_dst;
+ err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
+ if (err)
+ return err;
+
+ err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
+ vxlan, extack);
+ if (err)
+ return err;
+
+ if (dst->remote_dev == lowerdev)
+ lowerdev = NULL;
+
+ err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
+ extack);
+ if (err)
+ return err;
+
+ /* handle default dst entry */
+ if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
+ u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
+
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+ if (!vxlan_addr_any(&conf.remote_ip)) {
+ err = vxlan_fdb_update(vxlan, all_zeros_mac,
+ &conf.remote_ip,
+ NUD_REACHABLE | NUD_PERMANENT,
+ NLM_F_APPEND | NLM_F_CREATE,
+ vxlan->cfg.dst_port,
+ conf.vni, conf.vni,
+ conf.remote_ifindex,
+ NTF_SELF, 0, true, extack);
+ if (err) {
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+ netdev_adjacent_change_abort(dst->remote_dev,
+ lowerdev, dev);
+ return err;
+ }
+ }
+ if (!vxlan_addr_any(&dst->remote_ip))
+ __vxlan_fdb_delete(vxlan, all_zeros_mac,
+ dst->remote_ip,
+ vxlan->cfg.dst_port,
+ dst->remote_vni,
+ dst->remote_vni,
+ dst->remote_ifindex,
+ true);
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+ }
+
+ if (conf.age_interval != vxlan->cfg.age_interval)
+ mod_timer(&vxlan->age_timer, jiffies);
+
+ netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
+ if (lowerdev && lowerdev != dst->remote_dev)
+ dst->remote_dev = lowerdev;
+ vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
+ return 0;
+}
+
+static void vxlan_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+
+ vxlan_flush(vxlan, true);
+
+ list_del(&vxlan->next);
+ unregister_netdevice_queue(dev, head);
+ if (vxlan->default_dst.remote_dev)
+ netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
+}
+
+static size_t vxlan_get_size(const struct net_device *dev)
+{
+
+ return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
+ nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
+ nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
+ nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
+ nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
+ nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
+ 0;
+}
+
+static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ const struct vxlan_dev *vxlan = netdev_priv(dev);
+ const struct vxlan_rdst *dst = &vxlan->default_dst;
+ struct ifla_vxlan_port_range ports = {
+ .low = htons(vxlan->cfg.port_min),
+ .high = htons(vxlan->cfg.port_max),
+ };
+
+ if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
+ goto nla_put_failure;
+
+ if (!vxlan_addr_any(&dst->remote_ip)) {
+ if (dst->remote_ip.sa.sa_family == AF_INET) {
+ if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
+ dst->remote_ip.sin.sin_addr.s_addr))
+ goto nla_put_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
+ &dst->remote_ip.sin6.sin6_addr))
+ goto nla_put_failure;
+#endif
+ }
+ }
+
+ if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
+ goto nla_put_failure;
+
+ if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
+ if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
+ if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
+ vxlan->cfg.saddr.sin.sin_addr.s_addr))
+ goto nla_put_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
+ &vxlan->cfg.saddr.sin6.sin6_addr))
+ goto nla_put_failure;
+#endif
+ }
+ }
+
+ if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
+ nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
+ !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
+ nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
+ nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
+ nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
+ nla_put_u8(skb, IFLA_VXLAN_LEARNING,
+ !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
+ nla_put_u8(skb, IFLA_VXLAN_PROXY,
+ !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
+ nla_put_u8(skb, IFLA_VXLAN_RSC,
+ !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
+ nla_put_u8(skb, IFLA_VXLAN_L2MISS,
+ !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
+ nla_put_u8(skb, IFLA_VXLAN_L3MISS,
+ !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
+ nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
+ !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
+ nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
+ nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
+ nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
+ nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
+ !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
+ nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
+ !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
+ nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
+ !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
+ nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
+ !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
+ nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
+ !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
+ goto nla_put_failure;
+
+ if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
+ goto nla_put_failure;
+
+ if (vxlan->cfg.flags & VXLAN_F_GBP &&
+ nla_put_flag(skb, IFLA_VXLAN_GBP))
+ goto nla_put_failure;
+
+ if (vxlan->cfg.flags & VXLAN_F_GPE &&
+ nla_put_flag(skb, IFLA_VXLAN_GPE))
+ goto nla_put_failure;
+
+ if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
+ nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static struct net *vxlan_get_link_net(const struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+
+ return vxlan->net;
+}
+
+static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
+ .kind = "vxlan",
+ .maxtype = IFLA_VXLAN_MAX,
+ .policy = vxlan_policy,
+ .priv_size = sizeof(struct vxlan_dev),
+ .setup = vxlan_setup,
+ .validate = vxlan_validate,
+ .newlink = vxlan_newlink,
+ .changelink = vxlan_changelink,
+ .dellink = vxlan_dellink,
+ .get_size = vxlan_get_size,
+ .fill_info = vxlan_fill_info,
+ .get_link_net = vxlan_get_link_net,
+};
+
+struct net_device *vxlan_dev_create(struct net *net, const char *name,
+ u8 name_assign_type,
+ struct vxlan_config *conf)
+{
+ struct nlattr *tb[IFLA_MAX + 1];
+ struct net_device *dev;
+ int err;
+
+ memset(&tb, 0, sizeof(tb));
+
+ dev = rtnl_create_link(net, name, name_assign_type,
+ &vxlan_link_ops, tb, NULL);
+ if (IS_ERR(dev))
+ return dev;
+
+ err = __vxlan_dev_create(net, dev, conf, NULL);
+ if (err < 0) {
+ free_netdev(dev);
+ return ERR_PTR(err);
+ }
+
+ err = rtnl_configure_link(dev, NULL);
+ if (err < 0) {
+ LIST_HEAD(list_kill);
+
+ vxlan_dellink(dev, &list_kill);
+ unregister_netdevice_many(&list_kill);
+ return ERR_PTR(err);
+ }
+
+ return dev;
+}
+EXPORT_SYMBOL_GPL(vxlan_dev_create);
+
+static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
+ struct net_device *dev)
+{
+ struct vxlan_dev *vxlan, *next;
+ LIST_HEAD(list_kill);
+
+ list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+
+ /* In case we created vxlan device with carrier
+ * and we loose the carrier due to module unload
+ * we also need to remove vxlan device. In other
+ * cases, it's not necessary and remote_ifindex
+ * is 0 here, so no matches.
+ */
+ if (dst->remote_ifindex == dev->ifindex)
+ vxlan_dellink(vxlan->dev, &list_kill);
+ }
+
+ unregister_netdevice_many(&list_kill);
+}
+
+static int vxlan_netdevice_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
+
+ if (event == NETDEV_UNREGISTER)
+ vxlan_handle_lowerdev_unregister(vn, dev);
+ else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
+ vxlan_offload_rx_ports(dev, true);
+ else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
+ vxlan_offload_rx_ports(dev, false);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block vxlan_notifier_block __read_mostly = {
+ .notifier_call = vxlan_netdevice_event,
+};
+
+static void
+vxlan_fdb_offloaded_set(struct net_device *dev,
+ struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *rdst;
+ struct vxlan_fdb *f;
+ u32 hash_index;
+
+ hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
+
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+
+ f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
+ if (!f)
+ goto out;
+
+ rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
+ fdb_info->remote_port,
+ fdb_info->remote_vni,
+ fdb_info->remote_ifindex);
+ if (!rdst)
+ goto out;
+
+ rdst->offloaded = fdb_info->offloaded;
+
+out:
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+}
+
+static int
+vxlan_fdb_external_learn_add(struct net_device *dev,
+ struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct netlink_ext_ack *extack;
+ u32 hash_index;
+ int err;
+
+ hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
+ extack = switchdev_notifier_info_to_extack(&fdb_info->info);
+
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+ err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
+ NUD_REACHABLE,
+ NLM_F_CREATE | NLM_F_REPLACE,
+ fdb_info->remote_port,
+ fdb_info->vni,
+ fdb_info->remote_vni,
+ fdb_info->remote_ifindex,
+ NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
+ 0, false, extack);
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+ return err;
+}
+
+static int
+vxlan_fdb_external_learn_del(struct net_device *dev,
+ struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_fdb *f;
+ u32 hash_index;
+ int err = 0;
+
+ hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+
+ f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
+ if (!f)
+ err = -ENOENT;
+ else if (f->flags & NTF_EXT_LEARNED)
+ err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
+ fdb_info->remote_ip,
+ fdb_info->remote_port,
+ fdb_info->vni,
+ fdb_info->remote_vni,
+ fdb_info->remote_ifindex,
+ false);
+
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+ return err;
+}
+
+static int vxlan_switchdev_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+ struct switchdev_notifier_vxlan_fdb_info *fdb_info;
+ int err = 0;
+
+ switch (event) {
+ case SWITCHDEV_VXLAN_FDB_OFFLOADED:
+ vxlan_fdb_offloaded_set(dev, ptr);
+ break;
+ case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
+ fdb_info = ptr;
+ err = vxlan_fdb_external_learn_add(dev, fdb_info);
+ if (err) {
+ err = notifier_from_errno(err);
+ break;
+ }
+ fdb_info->offloaded = true;
+ vxlan_fdb_offloaded_set(dev, fdb_info);
+ break;
+ case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
+ fdb_info = ptr;
+ err = vxlan_fdb_external_learn_del(dev, fdb_info);
+ if (err) {
+ err = notifier_from_errno(err);
+ break;
+ }
+ fdb_info->offloaded = false;
+ vxlan_fdb_offloaded_set(dev, fdb_info);
+ break;
+ }
+
+ return err;
+}
+
+static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
+ .notifier_call = vxlan_switchdev_event,
+};
+
+static void vxlan_fdb_nh_flush(struct nexthop *nh)
+{
+ struct vxlan_fdb *fdb;
+ struct vxlan_dev *vxlan;
+ u32 hash_index;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
+ vxlan = rcu_dereference(fdb->vdev);
+ WARN_ON(!vxlan);
+ hash_index = fdb_head_index(vxlan, fdb->eth_addr,
+ vxlan->default_dst.remote_vni);
+ spin_lock_bh(&vxlan->hash_lock[hash_index]);
+ if (!hlist_unhashed(&fdb->hlist))
+ vxlan_fdb_destroy(vxlan, fdb, false, false);
+ spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+ }
+ rcu_read_unlock();
+}
+
+static int vxlan_nexthop_event(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct nh_notifier_info *info = ptr;
+ struct nexthop *nh;
+
+ if (event != NEXTHOP_EVENT_DEL)
+ return NOTIFY_DONE;
+
+ nh = nexthop_find_by_id(info->net, info->id);
+ if (!nh)
+ return NOTIFY_DONE;
+
+ vxlan_fdb_nh_flush(nh);
+
+ return NOTIFY_DONE;
+}
+
+static __net_init int vxlan_init_net(struct net *net)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ unsigned int h;
+
+ INIT_LIST_HEAD(&vn->vxlan_list);
+ spin_lock_init(&vn->sock_lock);
+ vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
+
+ for (h = 0; h < PORT_HASH_SIZE; ++h)
+ INIT_HLIST_HEAD(&vn->sock_list[h]);
+
+ return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
+ NULL);
+}
+
+static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
+{
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+ struct vxlan_dev *vxlan, *next;
+ struct net_device *dev, *aux;
+
+ for_each_netdev_safe(net, dev, aux)
+ if (dev->rtnl_link_ops == &vxlan_link_ops)
+ unregister_netdevice_queue(dev, head);
+
+ list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
+ /* If vxlan->dev is in the same netns, it has already been added
+ * to the list by the previous loop.
+ */
+ if (!net_eq(dev_net(vxlan->dev), net))
+ unregister_netdevice_queue(vxlan->dev, head);
+ }
+
+}
+
+static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
+{
+ struct net *net;
+ LIST_HEAD(list);
+ unsigned int h;
+
+ list_for_each_entry(net, net_list, exit_list) {
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+ unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
+ }
+ rtnl_lock();
+ list_for_each_entry(net, net_list, exit_list)
+ vxlan_destroy_tunnels(net, &list);
+
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+
+ list_for_each_entry(net, net_list, exit_list) {
+ struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+ for (h = 0; h < PORT_HASH_SIZE; ++h)
+ WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
+ }
+}
+
+static struct pernet_operations vxlan_net_ops = {
+ .init = vxlan_init_net,
+ .exit_batch = vxlan_exit_batch_net,
+ .id = &vxlan_net_id,
+ .size = sizeof(struct vxlan_net),
+};
+
+static int __init vxlan_init_module(void)
+{
+ int rc;
+
+ get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
+
+ rc = register_pernet_subsys(&vxlan_net_ops);
+ if (rc)
+ goto out1;
+
+ rc = register_netdevice_notifier(&vxlan_notifier_block);
+ if (rc)
+ goto out2;
+
+ rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
+ if (rc)
+ goto out3;
+
+ rc = rtnl_link_register(&vxlan_link_ops);
+ if (rc)
+ goto out4;
+
+ return 0;
+out4:
+ unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
+out3:
+ unregister_netdevice_notifier(&vxlan_notifier_block);
+out2:
+ unregister_pernet_subsys(&vxlan_net_ops);
+out1:
+ return rc;
+}
+late_initcall(vxlan_init_module);
+
+static void __exit vxlan_cleanup_module(void)
+{
+ rtnl_link_unregister(&vxlan_link_ops);
+ unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
+ unregister_netdevice_notifier(&vxlan_notifier_block);
+ unregister_pernet_subsys(&vxlan_net_ops);
+ /* rcu_barrier() is called by netns */
+}
+module_exit(vxlan_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(VXLAN_VERSION);
+MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
+MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
+MODULE_ALIAS_RTNL_LINK("vxlan");
projects / linux-2.6-block.git / commitdiff