2 * VXLAN: Virtual eXtensible Local Area Network
4 * Copyright (c) 2012-2013 Vyatta Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
31 #include <net/ndisc.h>
33 #include <net/ip_tunnels.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
46 #if IS_ENABLED(CONFIG_IPV6)
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
52 #include <net/dst_metadata.h>
54 #define VXLAN_VERSION "0.1"
56 #define PORT_HASH_BITS 8
57 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61 /* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
63 * for compatibility with early adopters.
65 static unsigned short vxlan_port __read_mostly = 8472;
66 module_param_named(udp_port, vxlan_port, ushort, 0444);
67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
69 static bool log_ecn_error = true;
70 module_param(log_ecn_error, bool, 0644);
71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73 static int vxlan_net_id;
74 static struct rtnl_link_ops vxlan_link_ops;
76 static const u8 all_zeros_mac[ETH_ALEN + 2];
78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
80 /* per-network namespace private data for this module */
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
87 /* Forwarding table entry */
89 struct hlist_node hlist; /* linked list of entries */
91 unsigned long updated; /* jiffies */
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101 static struct workqueue_struct *vxlan_wq;
103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
105 return vs->flags & VXLAN_F_COLLECT_METADATA ||
106 ip_tunnel_collect_metadata();
109 #if IS_ENABLED(CONFIG_IPV6)
111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
113 if (a->sa.sa_family != b->sa.sa_family)
115 if (a->sa.sa_family == AF_INET6)
116 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
118 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
123 if (ipa->sa.sa_family == AF_INET6)
124 return ipv6_addr_any(&ipa->sin6.sin6_addr);
126 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
131 if (ipa->sa.sa_family == AF_INET6)
132 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
134 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
139 if (nla_len(nla) >= sizeof(struct in6_addr)) {
140 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141 ip->sa.sa_family = AF_INET6;
143 } else if (nla_len(nla) >= sizeof(__be32)) {
144 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145 ip->sa.sa_family = AF_INET;
148 return -EAFNOSUPPORT;
152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153 const union vxlan_addr *ip)
155 if (ip->sa.sa_family == AF_INET6)
156 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
161 #else /* !CONFIG_IPV6 */
164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
166 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
171 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
176 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
181 if (nla_len(nla) >= sizeof(struct in6_addr)) {
182 return -EAFNOSUPPORT;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
185 ip->sa.sa_family = AF_INET;
188 return -EAFNOSUPPORT;
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193 const union vxlan_addr *ip)
195 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
199 /* Virtual Network hash table head */
200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
202 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
205 /* Socket hash table head */
206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
208 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
210 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
213 /* First remote destination for a forwarding entry.
214 * Guaranteed to be non-NULL because remotes are never deleted.
216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
218 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
223 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
226 /* Find VXLAN socket based on network namespace, address family and UDP port
227 * and enabled unshareable flags.
229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230 __be16 port, u32 flags)
232 struct vxlan_sock *vs;
234 flags &= VXLAN_F_RCV_FLAGS;
236 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238 vxlan_get_sk_family(vs) == family &&
245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
247 struct vxlan_dev *vxlan;
249 /* For flow based devices, map all packets to VNI 0 */
250 if (vs->flags & VXLAN_F_COLLECT_METADATA)
253 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
254 if (vxlan->default_dst.remote_vni == vni)
261 /* Look up VNI in a per net namespace table */
262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
263 sa_family_t family, __be16 port,
266 struct vxlan_sock *vs;
268 vs = vxlan_find_sock(net, family, port, flags);
272 return vxlan_vs_find_vni(vs, vni);
275 /* Fill in neighbour message in skbuff. */
276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
277 const struct vxlan_fdb *fdb,
278 u32 portid, u32 seq, int type, unsigned int flags,
279 const struct vxlan_rdst *rdst)
281 unsigned long now = jiffies;
282 struct nda_cacheinfo ci;
283 struct nlmsghdr *nlh;
285 bool send_ip, send_eth;
287 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
291 ndm = nlmsg_data(nlh);
292 memset(ndm, 0, sizeof(*ndm));
294 send_eth = send_ip = true;
296 if (type == RTM_GETNEIGH) {
297 ndm->ndm_family = AF_INET;
298 send_ip = !vxlan_addr_any(&rdst->remote_ip);
299 send_eth = !is_zero_ether_addr(fdb->eth_addr);
301 ndm->ndm_family = AF_BRIDGE;
302 ndm->ndm_state = fdb->state;
303 ndm->ndm_ifindex = vxlan->dev->ifindex;
304 ndm->ndm_flags = fdb->flags;
305 ndm->ndm_type = RTN_UNICAST;
307 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
308 nla_put_s32(skb, NDA_LINK_NETNSID,
309 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
310 goto nla_put_failure;
312 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
313 goto nla_put_failure;
315 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
316 goto nla_put_failure;
318 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
319 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
320 goto nla_put_failure;
321 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
322 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326 goto nla_put_failure;
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
340 nlmsg_cancel(skb, nlh);
344 static inline size_t vxlan_nlmsg_size(void)
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353 + nla_total_size(sizeof(struct nda_cacheinfo));
356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
359 struct net *net = dev_net(vxlan->dev);
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
384 struct vxlan_dev *vxlan = netdev_priv(dev);
385 struct vxlan_fdb f = {
388 struct vxlan_rdst remote = {
389 .remote_ip = *ipa, /* goes to NDA_DST */
390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
398 struct vxlan_fdb f = {
401 struct vxlan_rdst remote = { };
403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
408 /* Hash Ethernet address */
409 static u32 eth_hash(const unsigned char *addr)
411 u64 value = get_unaligned((u64 *)addr);
413 /* only want 6 bytes */
419 return hash_64(value, FDB_HASH_BITS);
422 /* Hash chain to use given mac address */
423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
426 return &vxlan->fdb_head[eth_hash(mac)];
429 /* Look up Ethernet address in forwarding table */
430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
433 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
436 hlist_for_each_entry_rcu(f, head, hlist) {
437 if (ether_addr_equal(mac, f->eth_addr))
444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
449 f = __vxlan_find_mac(vxlan, mac);
456 /* caller should hold vxlan->hash_lock */
457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
458 union vxlan_addr *ip, __be16 port,
459 __be32 vni, __u32 ifindex)
461 struct vxlan_rdst *rd;
463 list_for_each_entry(rd, &f->remotes, list) {
464 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
465 rd->remote_port == port &&
466 rd->remote_vni == vni &&
467 rd->remote_ifindex == ifindex)
474 /* Replace destination of unicast mac */
475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
476 union vxlan_addr *ip, __be16 port, __be32 vni,
479 struct vxlan_rdst *rd;
481 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
485 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
489 dst_cache_reset(&rd->dst_cache);
491 rd->remote_port = port;
492 rd->remote_vni = vni;
493 rd->remote_ifindex = ifindex;
497 /* Add/update destinations for multicast */
498 static int vxlan_fdb_append(struct vxlan_fdb *f,
499 union vxlan_addr *ip, __be16 port, __be32 vni,
500 __u32 ifindex, struct vxlan_rdst **rdp)
502 struct vxlan_rdst *rd;
504 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
508 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
512 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
522 list_add_tail_rcu(&rd->list, &f->remotes);
528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
530 struct vxlanhdr *vh, size_t hdrlen,
532 struct gro_remcsum *grc,
535 size_t start, offset;
537 if (skb->remcsum_offload)
540 if (!NAPI_GRO_CB(skb)->csum_valid)
543 start = vxlan_rco_start(vni_field);
544 offset = start + vxlan_rco_offset(vni_field);
546 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
547 start, offset, grc, nopartial);
549 skb->remcsum_offload = 1;
554 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
556 struct udp_offload *uoff)
558 struct sk_buff *p, **pp = NULL;
559 struct vxlanhdr *vh, *vh2;
560 unsigned int hlen, off_vx;
562 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
565 struct gro_remcsum grc;
567 skb_gro_remcsum_init(&grc);
569 off_vx = skb_gro_offset(skb);
570 hlen = off_vx + sizeof(*vh);
571 vh = skb_gro_header_fast(skb, off_vx);
572 if (skb_gro_header_hard(skb, hlen)) {
573 vh = skb_gro_header_slow(skb, hlen, off_vx);
578 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
580 flags = vh->vx_flags;
582 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
583 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
586 VXLAN_F_REMCSUM_NOPARTIAL));
592 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
596 for (p = *head; p; p = p->next) {
597 if (!NAPI_GRO_CB(p)->same_flow)
600 vh2 = (struct vxlanhdr *)(p->data + off_vx);
601 if (vh->vx_flags != vh2->vx_flags ||
602 vh->vx_vni != vh2->vx_vni) {
603 NAPI_GRO_CB(p)->same_flow = 0;
608 pp = eth_gro_receive(head, skb);
611 skb_gro_remcsum_cleanup(skb, &grc);
612 NAPI_GRO_CB(skb)->flush |= flush;
617 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
618 struct udp_offload *uoff)
620 udp_tunnel_gro_complete(skb, nhoff);
622 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
625 /* Notify netdevs that UDP port started listening */
626 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
628 struct net_device *dev;
629 struct sock *sk = vs->sock->sk;
630 struct net *net = sock_net(sk);
631 sa_family_t sa_family = vxlan_get_sk_family(vs);
632 __be16 port = inet_sk(sk)->inet_sport;
635 if (sa_family == AF_INET) {
636 err = udp_add_offload(net, &vs->udp_offloads);
638 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
642 for_each_netdev_rcu(net, dev) {
643 if (dev->netdev_ops->ndo_add_vxlan_port)
644 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
650 /* Notify netdevs that UDP port is no more listening */
651 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
653 struct net_device *dev;
654 struct sock *sk = vs->sock->sk;
655 struct net *net = sock_net(sk);
656 sa_family_t sa_family = vxlan_get_sk_family(vs);
657 __be16 port = inet_sk(sk)->inet_sport;
660 for_each_netdev_rcu(net, dev) {
661 if (dev->netdev_ops->ndo_del_vxlan_port)
662 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
667 if (sa_family == AF_INET)
668 udp_del_offload(&vs->udp_offloads);
671 /* Add new entry to forwarding table -- assumes lock held */
672 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
673 const u8 *mac, union vxlan_addr *ip,
674 __u16 state, __u16 flags,
675 __be16 port, __be32 vni, __u32 ifindex,
678 struct vxlan_rdst *rd = NULL;
682 f = __vxlan_find_mac(vxlan, mac);
684 if (flags & NLM_F_EXCL) {
685 netdev_dbg(vxlan->dev,
686 "lost race to create %pM\n", mac);
689 if (f->state != state) {
691 f->updated = jiffies;
694 if (f->flags != ndm_flags) {
695 f->flags = ndm_flags;
696 f->updated = jiffies;
699 if ((flags & NLM_F_REPLACE)) {
700 /* Only change unicasts */
701 if (!(is_multicast_ether_addr(f->eth_addr) ||
702 is_zero_ether_addr(f->eth_addr))) {
703 notify |= vxlan_fdb_replace(f, ip, port, vni,
708 if ((flags & NLM_F_APPEND) &&
709 (is_multicast_ether_addr(f->eth_addr) ||
710 is_zero_ether_addr(f->eth_addr))) {
711 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
719 if (!(flags & NLM_F_CREATE))
722 if (vxlan->cfg.addrmax &&
723 vxlan->addrcnt >= vxlan->cfg.addrmax)
726 /* Disallow replace to add a multicast entry */
727 if ((flags & NLM_F_REPLACE) &&
728 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
731 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
732 f = kmalloc(sizeof(*f), GFP_ATOMIC);
738 f->flags = ndm_flags;
739 f->updated = f->used = jiffies;
740 INIT_LIST_HEAD(&f->remotes);
741 memcpy(f->eth_addr, mac, ETH_ALEN);
743 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
746 hlist_add_head_rcu(&f->hlist,
747 vxlan_fdb_head(vxlan, mac));
752 rd = first_remote_rtnl(f);
753 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
759 static void vxlan_fdb_free(struct rcu_head *head)
761 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
762 struct vxlan_rdst *rd, *nd;
764 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
765 dst_cache_destroy(&rd->dst_cache);
771 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
773 netdev_dbg(vxlan->dev,
774 "delete %pM\n", f->eth_addr);
777 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
779 hlist_del_rcu(&f->hlist);
780 call_rcu(&f->rcu, vxlan_fdb_free);
783 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
784 union vxlan_addr *ip, __be16 *port, __be32 *vni,
787 struct net *net = dev_net(vxlan->dev);
791 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
795 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
796 if (remote->sa.sa_family == AF_INET) {
797 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
798 ip->sa.sa_family = AF_INET;
799 #if IS_ENABLED(CONFIG_IPV6)
801 ip->sin6.sin6_addr = in6addr_any;
802 ip->sa.sa_family = AF_INET6;
808 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
810 *port = nla_get_be16(tb[NDA_PORT]);
812 *port = vxlan->cfg.dst_port;
816 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
818 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
820 *vni = vxlan->default_dst.remote_vni;
823 if (tb[NDA_IFINDEX]) {
824 struct net_device *tdev;
826 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
828 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
829 tdev = __dev_get_by_index(net, *ifindex);
831 return -EADDRNOTAVAIL;
839 /* Add static entry (via netlink) */
840 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
841 struct net_device *dev,
842 const unsigned char *addr, u16 vid, u16 flags)
844 struct vxlan_dev *vxlan = netdev_priv(dev);
845 /* struct net *net = dev_net(vxlan->dev); */
852 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
853 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
858 if (tb[NDA_DST] == NULL)
861 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
865 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
866 return -EAFNOSUPPORT;
868 spin_lock_bh(&vxlan->hash_lock);
869 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
870 port, vni, ifindex, ndm->ndm_flags);
871 spin_unlock_bh(&vxlan->hash_lock);
876 /* Delete entry (via netlink) */
877 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
878 struct net_device *dev,
879 const unsigned char *addr, u16 vid)
881 struct vxlan_dev *vxlan = netdev_priv(dev);
883 struct vxlan_rdst *rd = NULL;
890 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
896 spin_lock_bh(&vxlan->hash_lock);
897 f = vxlan_find_mac(vxlan, addr);
901 if (!vxlan_addr_any(&ip)) {
902 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
909 /* remove a destination if it's not the only one on the list,
910 * otherwise destroy the fdb entry
912 if (rd && !list_is_singular(&f->remotes)) {
913 list_del_rcu(&rd->list);
914 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
919 vxlan_fdb_destroy(vxlan, f);
922 spin_unlock_bh(&vxlan->hash_lock);
927 /* Dump forwarding table */
928 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
929 struct net_device *dev,
930 struct net_device *filter_dev, int idx)
932 struct vxlan_dev *vxlan = netdev_priv(dev);
935 for (h = 0; h < FDB_HASH_SIZE; ++h) {
939 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
940 struct vxlan_rdst *rd;
942 list_for_each_entry_rcu(rd, &f->remotes, list) {
943 if (idx < cb->args[0])
946 err = vxlan_fdb_info(skb, vxlan, f,
947 NETLINK_CB(cb->skb).portid,
962 /* Watch incoming packets to learn mapping between Ethernet address
963 * and Tunnel endpoint.
964 * Return true if packet is bogus and should be dropped.
966 static bool vxlan_snoop(struct net_device *dev,
967 union vxlan_addr *src_ip, const u8 *src_mac)
969 struct vxlan_dev *vxlan = netdev_priv(dev);
972 f = vxlan_find_mac(vxlan, src_mac);
974 struct vxlan_rdst *rdst = first_remote_rcu(f);
976 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
979 /* Don't migrate static entries, drop packets */
980 if (f->state & NUD_NOARP)
985 "%pM migrated from %pIS to %pIS\n",
986 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
988 rdst->remote_ip = *src_ip;
989 f->updated = jiffies;
990 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
992 /* learned new entry */
993 spin_lock(&vxlan->hash_lock);
995 /* close off race between vxlan_flush and incoming packets */
996 if (netif_running(dev))
997 vxlan_fdb_create(vxlan, src_mac, src_ip,
999 NLM_F_EXCL|NLM_F_CREATE,
1000 vxlan->cfg.dst_port,
1001 vxlan->default_dst.remote_vni,
1003 spin_unlock(&vxlan->hash_lock);
1009 /* See if multicast group is already in use by other ID */
1010 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1012 struct vxlan_dev *vxlan;
1013 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1015 /* The vxlan_sock is only used by dev, leaving group has
1016 * no effect on other vxlan devices.
1018 if (family == AF_INET && dev->vn4_sock &&
1019 atomic_read(&dev->vn4_sock->refcnt) == 1)
1021 #if IS_ENABLED(CONFIG_IPV6)
1022 if (family == AF_INET6 && dev->vn6_sock &&
1023 atomic_read(&dev->vn6_sock->refcnt) == 1)
1027 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1028 if (!netif_running(vxlan->dev) || vxlan == dev)
1031 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1033 #if IS_ENABLED(CONFIG_IPV6)
1034 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1038 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1039 &dev->default_dst.remote_ip))
1042 if (vxlan->default_dst.remote_ifindex !=
1043 dev->default_dst.remote_ifindex)
1052 static void __vxlan_sock_release(struct vxlan_sock *vs)
1054 struct vxlan_net *vn;
1058 if (!atomic_dec_and_test(&vs->refcnt))
1061 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1062 spin_lock(&vn->sock_lock);
1063 hlist_del_rcu(&vs->hlist);
1064 vxlan_notify_del_rx_port(vs);
1065 spin_unlock(&vn->sock_lock);
1067 queue_work(vxlan_wq, &vs->del_work);
1070 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1072 __vxlan_sock_release(vxlan->vn4_sock);
1073 #if IS_ENABLED(CONFIG_IPV6)
1074 __vxlan_sock_release(vxlan->vn6_sock);
1078 /* Update multicast group membership when first VNI on
1079 * multicast address is brought up
1081 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1084 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1085 int ifindex = vxlan->default_dst.remote_ifindex;
1088 if (ip->sa.sa_family == AF_INET) {
1089 struct ip_mreqn mreq = {
1090 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1091 .imr_ifindex = ifindex,
1094 sk = vxlan->vn4_sock->sock->sk;
1096 ret = ip_mc_join_group(sk, &mreq);
1098 #if IS_ENABLED(CONFIG_IPV6)
1100 sk = vxlan->vn6_sock->sock->sk;
1102 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1103 &ip->sin6.sin6_addr);
1111 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1112 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1116 int ifindex = vxlan->default_dst.remote_ifindex;
1119 if (ip->sa.sa_family == AF_INET) {
1120 struct ip_mreqn mreq = {
1121 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1122 .imr_ifindex = ifindex,
1125 sk = vxlan->vn4_sock->sock->sk;
1127 ret = ip_mc_leave_group(sk, &mreq);
1129 #if IS_ENABLED(CONFIG_IPV6)
1131 sk = vxlan->vn6_sock->sock->sk;
1133 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1134 &ip->sin6.sin6_addr);
1142 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1143 struct sk_buff *skb, u32 vxflags)
1145 size_t start, offset, plen;
1147 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1150 start = vxlan_rco_start(unparsed->vx_vni);
1151 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1153 plen = sizeof(struct vxlanhdr) + offset + sizeof(u16);
1155 if (!pskb_may_pull(skb, plen))
1158 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1161 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162 unparsed->vx_vni &= VXLAN_VNI_MASK;
1166 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167 struct sk_buff *skb, u32 vxflags,
1168 struct vxlan_metadata *md)
1170 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171 struct metadata_dst *tun_dst;
1173 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1176 md->gbp = ntohs(gbp->policy_id);
1178 tun_dst = (struct metadata_dst *)skb_dst(skb);
1180 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1182 if (gbp->dont_learn)
1183 md->gbp |= VXLAN_GBP_DONT_LEARN;
1185 if (gbp->policy_applied)
1186 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1188 /* In flow-based mode, GBP is carried in dst_metadata */
1189 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1190 skb->mark = md->gbp;
1192 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1195 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1196 struct vxlan_sock *vs,
1197 struct sk_buff *skb)
1199 union vxlan_addr saddr;
1201 skb_reset_mac_header(skb);
1202 skb->protocol = eth_type_trans(skb, vxlan->dev);
1203 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1205 /* Ignore packet loops (and multicast echo) */
1206 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1209 /* Get address from the outer IP header */
1210 if (vxlan_get_sk_family(vs) == AF_INET) {
1211 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1212 saddr.sa.sa_family = AF_INET;
1213 #if IS_ENABLED(CONFIG_IPV6)
1215 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1216 saddr.sa.sa_family = AF_INET6;
1220 if ((vxlan->flags & VXLAN_F_LEARN) &&
1221 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1227 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1228 struct sk_buff *skb)
1232 if (vxlan_get_sk_family(vs) == AF_INET)
1233 err = IP_ECN_decapsulate(oiph, skb);
1234 #if IS_ENABLED(CONFIG_IPV6)
1236 err = IP6_ECN_decapsulate(oiph, skb);
1239 if (unlikely(err) && log_ecn_error) {
1240 if (vxlan_get_sk_family(vs) == AF_INET)
1241 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1242 &((struct iphdr *)oiph)->saddr,
1243 ((struct iphdr *)oiph)->tos);
1245 net_info_ratelimited("non-ECT from %pI6\n",
1246 &((struct ipv6hdr *)oiph)->saddr);
1251 /* Callback from net/ipv4/udp.c to receive packets */
1252 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1254 struct pcpu_sw_netstats *stats;
1255 struct vxlan_dev *vxlan;
1256 struct vxlan_sock *vs;
1257 struct vxlanhdr unparsed;
1258 struct vxlan_metadata _md;
1259 struct vxlan_metadata *md = &_md;
1262 /* Need Vxlan and inner Ethernet header to be present */
1263 if (!pskb_may_pull(skb, VXLAN_HLEN))
1266 unparsed = *vxlan_hdr(skb);
1267 /* VNI flag always required to be set */
1268 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1269 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1270 ntohl(vxlan_hdr(skb)->vx_flags),
1271 ntohl(vxlan_hdr(skb)->vx_vni));
1272 /* Return non vxlan pkt */
1275 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1276 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1278 vs = rcu_dereference_sk_user_data(sk);
1282 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1286 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1287 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1290 if (vxlan_collect_metadata(vs)) {
1291 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1292 struct metadata_dst *tun_dst;
1294 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1295 vxlan_vni_to_tun_id(vni), sizeof(*md));
1300 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1302 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1304 memset(md, 0, sizeof(*md));
1307 /* For backwards compatibility, only allow reserved fields to be
1308 * used by VXLAN extensions if explicitly requested.
1310 if (vs->flags & VXLAN_F_REMCSUM_RX)
1311 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1313 if (vs->flags & VXLAN_F_GBP)
1314 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1316 if (unparsed.vx_flags || unparsed.vx_vni) {
1317 /* If there are any unprocessed flags remaining treat
1318 * this as a malformed packet. This behavior diverges from
1319 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1320 * in reserved fields are to be ignored. The approach here
1321 * maintains compatibility with previous stack code, and also
1322 * is more robust and provides a little more security in
1323 * adding extensions to VXLAN.
1328 if (!vxlan_set_mac(vxlan, vs, skb))
1331 oiph = skb_network_header(skb);
1332 skb_reset_network_header(skb);
1334 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1335 ++vxlan->dev->stats.rx_frame_errors;
1336 ++vxlan->dev->stats.rx_errors;
1340 stats = this_cpu_ptr(vxlan->dev->tstats);
1341 u64_stats_update_begin(&stats->syncp);
1342 stats->rx_packets++;
1343 stats->rx_bytes += skb->len;
1344 u64_stats_update_end(&stats->syncp);
1346 gro_cells_receive(&vxlan->gro_cells, skb);
1350 /* Consume bad packet */
1355 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357 struct vxlan_dev *vxlan = netdev_priv(dev);
1358 struct arphdr *parp;
1361 struct neighbour *n;
1363 if (dev->flags & IFF_NOARP)
1366 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1367 dev->stats.tx_dropped++;
1370 parp = arp_hdr(skb);
1372 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1373 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1374 parp->ar_pro != htons(ETH_P_IP) ||
1375 parp->ar_op != htons(ARPOP_REQUEST) ||
1376 parp->ar_hln != dev->addr_len ||
1379 arpptr = (u8 *)parp + sizeof(struct arphdr);
1381 arpptr += dev->addr_len; /* sha */
1382 memcpy(&sip, arpptr, sizeof(sip));
1383 arpptr += sizeof(sip);
1384 arpptr += dev->addr_len; /* tha */
1385 memcpy(&tip, arpptr, sizeof(tip));
1387 if (ipv4_is_loopback(tip) ||
1388 ipv4_is_multicast(tip))
1391 n = neigh_lookup(&arp_tbl, &tip, dev);
1394 struct vxlan_fdb *f;
1395 struct sk_buff *reply;
1397 if (!(n->nud_state & NUD_CONNECTED)) {
1402 f = vxlan_find_mac(vxlan, n->ha);
1403 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1404 /* bridge-local neighbor */
1409 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1417 skb_reset_mac_header(reply);
1418 __skb_pull(reply, skb_network_offset(reply));
1419 reply->ip_summed = CHECKSUM_UNNECESSARY;
1420 reply->pkt_type = PACKET_HOST;
1422 if (netif_rx_ni(reply) == NET_RX_DROP)
1423 dev->stats.rx_dropped++;
1424 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1425 union vxlan_addr ipa = {
1426 .sin.sin_addr.s_addr = tip,
1427 .sin.sin_family = AF_INET,
1430 vxlan_ip_miss(dev, &ipa);
1434 return NETDEV_TX_OK;
1437 #if IS_ENABLED(CONFIG_IPV6)
1438 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1439 struct neighbour *n, bool isrouter)
1441 struct net_device *dev = request->dev;
1442 struct sk_buff *reply;
1443 struct nd_msg *ns, *na;
1444 struct ipv6hdr *pip6;
1446 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1453 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1454 sizeof(*na) + na_olen + dev->needed_tailroom;
1455 reply = alloc_skb(len, GFP_ATOMIC);
1459 reply->protocol = htons(ETH_P_IPV6);
1461 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1462 skb_push(reply, sizeof(struct ethhdr));
1463 skb_reset_mac_header(reply);
1465 ns = (struct nd_msg *)skb_transport_header(request);
1467 daddr = eth_hdr(request)->h_source;
1468 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1469 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1470 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1471 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1476 /* Ethernet header */
1477 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1478 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1479 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1480 reply->protocol = htons(ETH_P_IPV6);
1482 skb_pull(reply, sizeof(struct ethhdr));
1483 skb_reset_network_header(reply);
1484 skb_put(reply, sizeof(struct ipv6hdr));
1488 pip6 = ipv6_hdr(reply);
1489 memset(pip6, 0, sizeof(struct ipv6hdr));
1491 pip6->priority = ipv6_hdr(request)->priority;
1492 pip6->nexthdr = IPPROTO_ICMPV6;
1493 pip6->hop_limit = 255;
1494 pip6->daddr = ipv6_hdr(request)->saddr;
1495 pip6->saddr = *(struct in6_addr *)n->primary_key;
1497 skb_pull(reply, sizeof(struct ipv6hdr));
1498 skb_reset_transport_header(reply);
1500 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502 /* Neighbor Advertisement */
1503 memset(na, 0, sizeof(*na)+na_olen);
1504 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1505 na->icmph.icmp6_router = isrouter;
1506 na->icmph.icmp6_override = 1;
1507 na->icmph.icmp6_solicited = 1;
1508 na->target = ns->target;
1509 ether_addr_copy(&na->opt[2], n->ha);
1510 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1511 na->opt[1] = na_olen >> 3;
1513 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1514 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1515 csum_partial(na, sizeof(*na)+na_olen, 0));
1517 pip6->payload_len = htons(sizeof(*na)+na_olen);
1519 skb_push(reply, sizeof(struct ipv6hdr));
1521 reply->ip_summed = CHECKSUM_UNNECESSARY;
1526 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528 struct vxlan_dev *vxlan = netdev_priv(dev);
1530 const struct ipv6hdr *iphdr;
1531 const struct in6_addr *saddr, *daddr;
1532 struct neighbour *n;
1533 struct inet6_dev *in6_dev;
1535 in6_dev = __in6_dev_get(dev);
1539 iphdr = ipv6_hdr(skb);
1540 saddr = &iphdr->saddr;
1541 daddr = &iphdr->daddr;
1543 msg = (struct nd_msg *)skb_transport_header(skb);
1544 if (msg->icmph.icmp6_code != 0 ||
1545 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1548 if (ipv6_addr_loopback(daddr) ||
1549 ipv6_addr_is_multicast(&msg->target))
1552 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1555 struct vxlan_fdb *f;
1556 struct sk_buff *reply;
1558 if (!(n->nud_state & NUD_CONNECTED)) {
1563 f = vxlan_find_mac(vxlan, n->ha);
1564 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1565 /* bridge-local neighbor */
1570 reply = vxlan_na_create(skb, n,
1571 !!(f ? f->flags & NTF_ROUTER : 0));
1578 if (netif_rx_ni(reply) == NET_RX_DROP)
1579 dev->stats.rx_dropped++;
1581 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1582 union vxlan_addr ipa = {
1583 .sin6.sin6_addr = msg->target,
1584 .sin6.sin6_family = AF_INET6,
1587 vxlan_ip_miss(dev, &ipa);
1592 return NETDEV_TX_OK;
1596 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598 struct vxlan_dev *vxlan = netdev_priv(dev);
1599 struct neighbour *n;
1601 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605 switch (ntohs(eth_hdr(skb)->h_proto)) {
1610 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1613 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1614 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1615 union vxlan_addr ipa = {
1616 .sin.sin_addr.s_addr = pip->daddr,
1617 .sin.sin_family = AF_INET,
1620 vxlan_ip_miss(dev, &ipa);
1626 #if IS_ENABLED(CONFIG_IPV6)
1629 struct ipv6hdr *pip6;
1631 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633 pip6 = ipv6_hdr(skb);
1634 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1635 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1636 union vxlan_addr ipa = {
1637 .sin6.sin6_addr = pip6->daddr,
1638 .sin6.sin6_family = AF_INET6,
1641 vxlan_ip_miss(dev, &ipa);
1655 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1657 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1668 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1669 struct vxlan_metadata *md)
1671 struct vxlanhdr_gbp *gbp;
1676 gbp = (struct vxlanhdr_gbp *)vxh;
1677 vxh->vx_flags |= VXLAN_HF_GBP;
1679 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1680 gbp->dont_learn = 1;
1682 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1683 gbp->policy_applied = 1;
1685 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1688 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1689 int iphdr_len, __be32 vni,
1690 struct vxlan_metadata *md, u32 vxflags,
1693 struct vxlanhdr *vxh;
1696 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1698 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1699 skb->ip_summed == CHECKSUM_PARTIAL) {
1700 int csum_start = skb_checksum_start_offset(skb);
1702 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1703 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1704 (skb->csum_offset == offsetof(struct udphdr, check) ||
1705 skb->csum_offset == offsetof(struct tcphdr, check)))
1706 type |= SKB_GSO_TUNNEL_REMCSUM;
1709 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1710 + VXLAN_HLEN + iphdr_len
1711 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1713 /* Need space for new headers (invalidates iph ptr) */
1714 err = skb_cow_head(skb, min_headroom);
1715 if (unlikely(err)) {
1720 skb = vlan_hwaccel_push_inside(skb);
1724 skb = iptunnel_handle_offloads(skb, type);
1726 return PTR_ERR(skb);
1728 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1729 vxh->vx_flags = VXLAN_HF_VNI;
1730 vxh->vx_vni = vxlan_vni_field(vni);
1732 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1735 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1736 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1737 vxh->vx_flags |= VXLAN_HF_RCO;
1739 if (!skb_is_gso(skb)) {
1740 skb->ip_summed = CHECKSUM_NONE;
1741 skb->encapsulation = 0;
1745 if (vxflags & VXLAN_F_GBP)
1746 vxlan_build_gbp_hdr(vxh, vxflags, md);
1748 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1752 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1753 struct sk_buff *skb, int oif, u8 tos,
1754 __be32 daddr, __be32 *saddr,
1755 struct dst_cache *dst_cache,
1756 struct ip_tunnel_info *info)
1758 struct rtable *rt = NULL;
1759 bool use_cache = false;
1762 /* when the ip_tunnel_info is availble, the tos used for lookup is
1763 * packet independent, so we can use the cache
1765 if (!skb->mark && (!tos || info)) {
1767 rt = dst_cache_get_ip4(dst_cache, saddr);
1772 memset(&fl4, 0, sizeof(fl4));
1773 fl4.flowi4_oif = oif;
1774 fl4.flowi4_tos = RT_TOS(tos);
1775 fl4.flowi4_mark = skb->mark;
1776 fl4.flowi4_proto = IPPROTO_UDP;
1778 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1780 rt = ip_route_output_key(vxlan->net, &fl4);
1784 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1789 #if IS_ENABLED(CONFIG_IPV6)
1790 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1791 struct sk_buff *skb, int oif,
1792 const struct in6_addr *daddr,
1793 struct in6_addr *saddr,
1794 struct dst_cache *dst_cache)
1796 struct dst_entry *ndst;
1801 ndst = dst_cache_get_ip6(dst_cache, saddr);
1806 memset(&fl6, 0, sizeof(fl6));
1807 fl6.flowi6_oif = oif;
1809 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1810 fl6.flowi6_mark = skb->mark;
1811 fl6.flowi6_proto = IPPROTO_UDP;
1813 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1814 vxlan->vn6_sock->sock->sk,
1817 return ERR_PTR(err);
1821 dst_cache_set_ip6(dst_cache, ndst, saddr);
1826 /* Bypass encapsulation if the destination is local */
1827 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1828 struct vxlan_dev *dst_vxlan)
1830 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1831 union vxlan_addr loopback;
1832 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1833 struct net_device *dev = skb->dev;
1836 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1837 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1838 skb->pkt_type = PACKET_HOST;
1839 skb->encapsulation = 0;
1840 skb->dev = dst_vxlan->dev;
1841 __skb_pull(skb, skb_network_offset(skb));
1843 if (remote_ip->sa.sa_family == AF_INET) {
1844 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1845 loopback.sa.sa_family = AF_INET;
1846 #if IS_ENABLED(CONFIG_IPV6)
1848 loopback.sin6.sin6_addr = in6addr_loopback;
1849 loopback.sa.sa_family = AF_INET6;
1853 if (dst_vxlan->flags & VXLAN_F_LEARN)
1854 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1856 u64_stats_update_begin(&tx_stats->syncp);
1857 tx_stats->tx_packets++;
1858 tx_stats->tx_bytes += len;
1859 u64_stats_update_end(&tx_stats->syncp);
1861 if (netif_rx(skb) == NET_RX_SUCCESS) {
1862 u64_stats_update_begin(&rx_stats->syncp);
1863 rx_stats->rx_packets++;
1864 rx_stats->rx_bytes += len;
1865 u64_stats_update_end(&rx_stats->syncp);
1867 dev->stats.rx_dropped++;
1871 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1872 struct vxlan_rdst *rdst, bool did_rsc)
1874 struct dst_cache *dst_cache;
1875 struct ip_tunnel_info *info;
1876 struct vxlan_dev *vxlan = netdev_priv(dev);
1878 struct rtable *rt = NULL;
1879 const struct iphdr *old_iph;
1880 union vxlan_addr *dst;
1881 union vxlan_addr remote_ip;
1882 struct vxlan_metadata _md;
1883 struct vxlan_metadata *md = &_md;
1884 __be16 src_port = 0, dst_port;
1889 u32 flags = vxlan->flags;
1890 bool udp_sum = false;
1891 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1893 info = skb_tunnel_info(skb);
1896 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1897 vni = rdst->remote_vni;
1898 dst = &rdst->remote_ip;
1899 dst_cache = &rdst->dst_cache;
1902 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1906 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1907 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1908 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1909 if (remote_ip.sa.sa_family == AF_INET)
1910 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1912 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1914 dst_cache = &info->dst_cache;
1917 if (vxlan_addr_any(dst)) {
1919 /* short-circuited back to local bridge */
1920 vxlan_encap_bypass(skb, vxlan, vxlan);
1926 old_iph = ip_hdr(skb);
1928 ttl = vxlan->cfg.ttl;
1929 if (!ttl && vxlan_addr_multicast(dst))
1932 tos = vxlan->cfg.tos;
1934 tos = ip_tunnel_get_dsfield(old_iph, skb);
1936 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1937 vxlan->cfg.port_max, true);
1940 ttl = info->key.ttl;
1941 tos = info->key.tos;
1942 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1944 if (info->options_len)
1945 md = ip_tunnel_info_opts(info);
1947 md->gbp = skb->mark;
1950 if (dst->sa.sa_family == AF_INET) {
1953 if (!vxlan->vn4_sock)
1955 sk = vxlan->vn4_sock->sock->sk;
1957 rt = vxlan_get_route(vxlan, skb,
1958 rdst ? rdst->remote_ifindex : 0, tos,
1959 dst->sin.sin_addr.s_addr, &saddr,
1962 netdev_dbg(dev, "no route to %pI4\n",
1963 &dst->sin.sin_addr.s_addr);
1964 dev->stats.tx_carrier_errors++;
1968 if (rt->dst.dev == dev) {
1969 netdev_dbg(dev, "circular route to %pI4\n",
1970 &dst->sin.sin_addr.s_addr);
1971 dev->stats.collisions++;
1975 /* Bypass encapsulation if the destination is local */
1976 if (rt->rt_flags & RTCF_LOCAL &&
1977 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1978 struct vxlan_dev *dst_vxlan;
1981 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1982 dst->sa.sa_family, dst_port,
1986 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1991 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
1992 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
1995 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1996 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1997 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
1998 vni, md, flags, udp_sum);
2002 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2003 dst->sin.sin_addr.s_addr, tos, ttl, df,
2004 src_port, dst_port, xnet, !udp_sum);
2005 #if IS_ENABLED(CONFIG_IPV6)
2007 struct dst_entry *ndst;
2008 struct in6_addr saddr;
2011 if (!vxlan->vn6_sock)
2013 sk = vxlan->vn6_sock->sock->sk;
2015 ndst = vxlan6_get_route(vxlan, skb,
2016 rdst ? rdst->remote_ifindex : 0,
2017 &dst->sin6.sin6_addr, &saddr,
2020 netdev_dbg(dev, "no route to %pI6\n",
2021 &dst->sin6.sin6_addr);
2022 dev->stats.tx_carrier_errors++;
2026 if (ndst->dev == dev) {
2027 netdev_dbg(dev, "circular route to %pI6\n",
2028 &dst->sin6.sin6_addr);
2030 dev->stats.collisions++;
2034 /* Bypass encapsulation if the destination is local */
2035 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2036 if (rt6i_flags & RTF_LOCAL &&
2037 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2038 struct vxlan_dev *dst_vxlan;
2041 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2042 dst->sa.sa_family, dst_port,
2046 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2051 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2053 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2054 skb_scrub_packet(skb, xnet);
2055 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2056 vni, md, flags, udp_sum);
2061 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2062 &saddr, &dst->sin6.sin6_addr,
2063 0, ttl, src_port, dst_port, !udp_sum);
2070 dev->stats.tx_dropped++;
2074 /* skb is already freed. */
2079 dev->stats.tx_errors++;
2084 /* Transmit local packets over Vxlan
2086 * Outer IP header inherits ECN and DF from inner header.
2087 * Outer UDP destination is the VXLAN assigned port.
2088 * source port is based on hash of flow
2090 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2092 struct vxlan_dev *vxlan = netdev_priv(dev);
2093 const struct ip_tunnel_info *info;
2095 bool did_rsc = false;
2096 struct vxlan_rdst *rdst, *fdst = NULL;
2097 struct vxlan_fdb *f;
2099 info = skb_tunnel_info(skb);
2101 skb_reset_mac_header(skb);
2104 if ((vxlan->flags & VXLAN_F_PROXY)) {
2105 if (ntohs(eth->h_proto) == ETH_P_ARP)
2106 return arp_reduce(dev, skb);
2107 #if IS_ENABLED(CONFIG_IPV6)
2108 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2109 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2110 + sizeof(struct nd_msg)) &&
2111 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2114 msg = (struct nd_msg *)skb_transport_header(skb);
2115 if (msg->icmph.icmp6_code == 0 &&
2116 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2117 return neigh_reduce(dev, skb);
2123 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2124 if (info && info->mode & IP_TUNNEL_INFO_TX)
2125 vxlan_xmit_one(skb, dev, NULL, false);
2128 return NETDEV_TX_OK;
2131 f = vxlan_find_mac(vxlan, eth->h_dest);
2134 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2135 (ntohs(eth->h_proto) == ETH_P_IP ||
2136 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2137 did_rsc = route_shortcircuit(dev, skb);
2139 f = vxlan_find_mac(vxlan, eth->h_dest);
2143 f = vxlan_find_mac(vxlan, all_zeros_mac);
2145 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2146 !is_multicast_ether_addr(eth->h_dest))
2147 vxlan_fdb_miss(vxlan, eth->h_dest);
2149 dev->stats.tx_dropped++;
2151 return NETDEV_TX_OK;
2155 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2156 struct sk_buff *skb1;
2162 skb1 = skb_clone(skb, GFP_ATOMIC);
2164 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2168 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2171 return NETDEV_TX_OK;
2174 /* Walk the forwarding table and purge stale entries */
2175 static void vxlan_cleanup(unsigned long arg)
2177 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2178 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2181 if (!netif_running(vxlan->dev))
2184 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2185 struct hlist_node *p, *n;
2187 spin_lock_bh(&vxlan->hash_lock);
2188 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2190 = container_of(p, struct vxlan_fdb, hlist);
2191 unsigned long timeout;
2193 if (f->state & NUD_PERMANENT)
2196 timeout = f->used + vxlan->cfg.age_interval * HZ;
2197 if (time_before_eq(timeout, jiffies)) {
2198 netdev_dbg(vxlan->dev,
2199 "garbage collect %pM\n",
2201 f->state = NUD_STALE;
2202 vxlan_fdb_destroy(vxlan, f);
2203 } else if (time_before(timeout, next_timer))
2204 next_timer = timeout;
2206 spin_unlock_bh(&vxlan->hash_lock);
2209 mod_timer(&vxlan->age_timer, next_timer);
2212 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2214 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2215 __be32 vni = vxlan->default_dst.remote_vni;
2217 spin_lock(&vn->sock_lock);
2218 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2219 spin_unlock(&vn->sock_lock);
2222 /* Setup stats when device is created */
2223 static int vxlan_init(struct net_device *dev)
2225 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2232 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2234 struct vxlan_fdb *f;
2236 spin_lock_bh(&vxlan->hash_lock);
2237 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2239 vxlan_fdb_destroy(vxlan, f);
2240 spin_unlock_bh(&vxlan->hash_lock);
2243 static void vxlan_uninit(struct net_device *dev)
2245 struct vxlan_dev *vxlan = netdev_priv(dev);
2247 vxlan_fdb_delete_default(vxlan);
2249 free_percpu(dev->tstats);
2252 /* Start ageing timer and join group when device is brought up */
2253 static int vxlan_open(struct net_device *dev)
2255 struct vxlan_dev *vxlan = netdev_priv(dev);
2258 ret = vxlan_sock_add(vxlan);
2262 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2263 ret = vxlan_igmp_join(vxlan);
2264 if (ret == -EADDRINUSE)
2267 vxlan_sock_release(vxlan);
2272 if (vxlan->cfg.age_interval)
2273 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2278 /* Purge the forwarding table */
2279 static void vxlan_flush(struct vxlan_dev *vxlan)
2283 spin_lock_bh(&vxlan->hash_lock);
2284 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2285 struct hlist_node *p, *n;
2286 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2288 = container_of(p, struct vxlan_fdb, hlist);
2289 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2290 if (!is_zero_ether_addr(f->eth_addr))
2291 vxlan_fdb_destroy(vxlan, f);
2294 spin_unlock_bh(&vxlan->hash_lock);
2297 /* Cleanup timer and forwarding table on shutdown */
2298 static int vxlan_stop(struct net_device *dev)
2300 struct vxlan_dev *vxlan = netdev_priv(dev);
2301 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2304 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2305 !vxlan_group_used(vn, vxlan))
2306 ret = vxlan_igmp_leave(vxlan);
2308 del_timer_sync(&vxlan->age_timer);
2311 vxlan_sock_release(vxlan);
2316 /* Stub, nothing needs to be done. */
2317 static void vxlan_set_multicast_list(struct net_device *dev)
2321 static int __vxlan_change_mtu(struct net_device *dev,
2322 struct net_device *lowerdev,
2323 struct vxlan_rdst *dst, int new_mtu, bool strict)
2325 int max_mtu = IP_MAX_MTU;
2328 max_mtu = lowerdev->mtu;
2330 if (dst->remote_ip.sa.sa_family == AF_INET6)
2331 max_mtu -= VXLAN6_HEADROOM;
2333 max_mtu -= VXLAN_HEADROOM;
2338 if (new_mtu > max_mtu) {
2349 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2351 struct vxlan_dev *vxlan = netdev_priv(dev);
2352 struct vxlan_rdst *dst = &vxlan->default_dst;
2353 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2354 dst->remote_ifindex);
2355 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2358 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2360 struct vxlan_dev *vxlan = netdev_priv(dev);
2361 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2362 __be16 sport, dport;
2364 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2365 vxlan->cfg.port_max, true);
2366 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2368 if (ip_tunnel_info_af(info) == AF_INET) {
2371 if (!vxlan->vn4_sock)
2373 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2374 info->key.u.ipv4.dst,
2375 &info->key.u.ipv4.src, NULL, info);
2380 #if IS_ENABLED(CONFIG_IPV6)
2381 struct dst_entry *ndst;
2383 if (!vxlan->vn6_sock)
2385 ndst = vxlan6_get_route(vxlan, skb, 0,
2386 &info->key.u.ipv6.dst,
2387 &info->key.u.ipv6.src, NULL);
2389 return PTR_ERR(ndst);
2391 #else /* !CONFIG_IPV6 */
2392 return -EPFNOSUPPORT;
2395 info->key.tp_src = sport;
2396 info->key.tp_dst = dport;
2400 static const struct net_device_ops vxlan_netdev_ops = {
2401 .ndo_init = vxlan_init,
2402 .ndo_uninit = vxlan_uninit,
2403 .ndo_open = vxlan_open,
2404 .ndo_stop = vxlan_stop,
2405 .ndo_start_xmit = vxlan_xmit,
2406 .ndo_get_stats64 = ip_tunnel_get_stats64,
2407 .ndo_set_rx_mode = vxlan_set_multicast_list,
2408 .ndo_change_mtu = vxlan_change_mtu,
2409 .ndo_validate_addr = eth_validate_addr,
2410 .ndo_set_mac_address = eth_mac_addr,
2411 .ndo_fdb_add = vxlan_fdb_add,
2412 .ndo_fdb_del = vxlan_fdb_delete,
2413 .ndo_fdb_dump = vxlan_fdb_dump,
2414 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2417 /* Info for udev, that this is a virtual tunnel endpoint */
2418 static struct device_type vxlan_type = {
2422 /* Calls the ndo_add_vxlan_port of the caller in order to
2423 * supply the listening VXLAN udp ports. Callers are expected
2424 * to implement the ndo_add_vxlan_port.
2426 void vxlan_get_rx_port(struct net_device *dev)
2428 struct vxlan_sock *vs;
2429 struct net *net = dev_net(dev);
2430 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2431 sa_family_t sa_family;
2435 spin_lock(&vn->sock_lock);
2436 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2437 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2438 port = inet_sk(vs->sock->sk)->inet_sport;
2439 sa_family = vxlan_get_sk_family(vs);
2440 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2444 spin_unlock(&vn->sock_lock);
2446 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2448 /* Initialize the device structure. */
2449 static void vxlan_setup(struct net_device *dev)
2451 struct vxlan_dev *vxlan = netdev_priv(dev);
2454 eth_hw_addr_random(dev);
2457 dev->netdev_ops = &vxlan_netdev_ops;
2458 dev->destructor = free_netdev;
2459 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2461 dev->features |= NETIF_F_LLTX;
2462 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2463 dev->features |= NETIF_F_RXCSUM;
2464 dev->features |= NETIF_F_GSO_SOFTWARE;
2466 dev->vlan_features = dev->features;
2467 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2468 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2469 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2470 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2471 netif_keep_dst(dev);
2472 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2473 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2475 INIT_LIST_HEAD(&vxlan->next);
2476 spin_lock_init(&vxlan->hash_lock);
2478 init_timer_deferrable(&vxlan->age_timer);
2479 vxlan->age_timer.function = vxlan_cleanup;
2480 vxlan->age_timer.data = (unsigned long) vxlan;
2482 vxlan->cfg.dst_port = htons(vxlan_port);
2486 gro_cells_init(&vxlan->gro_cells, dev);
2488 for (h = 0; h < FDB_HASH_SIZE; ++h)
2489 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2492 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2493 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2494 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2495 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2496 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2497 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2498 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2499 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2500 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2501 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2502 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2503 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2504 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2505 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2506 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2507 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2508 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2509 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2510 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2511 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2512 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2513 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2514 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2515 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2516 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2517 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2520 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2522 if (tb[IFLA_ADDRESS]) {
2523 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2524 pr_debug("invalid link address (not ethernet)\n");
2528 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2529 pr_debug("invalid all zero ethernet address\n");
2530 return -EADDRNOTAVAIL;
2537 if (data[IFLA_VXLAN_ID]) {
2538 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2539 if (id >= VXLAN_VID_MASK)
2543 if (data[IFLA_VXLAN_PORT_RANGE]) {
2544 const struct ifla_vxlan_port_range *p
2545 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2547 if (ntohs(p->high) < ntohs(p->low)) {
2548 pr_debug("port range %u .. %u not valid\n",
2549 ntohs(p->low), ntohs(p->high));
2557 static void vxlan_get_drvinfo(struct net_device *netdev,
2558 struct ethtool_drvinfo *drvinfo)
2560 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2561 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2564 static const struct ethtool_ops vxlan_ethtool_ops = {
2565 .get_drvinfo = vxlan_get_drvinfo,
2566 .get_link = ethtool_op_get_link,
2569 static void vxlan_del_work(struct work_struct *work)
2571 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2572 udp_tunnel_sock_release(vs->sock);
2576 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2577 __be16 port, u32 flags)
2579 struct socket *sock;
2580 struct udp_port_cfg udp_conf;
2583 memset(&udp_conf, 0, sizeof(udp_conf));
2586 udp_conf.family = AF_INET6;
2587 udp_conf.use_udp6_rx_checksums =
2588 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2589 udp_conf.ipv6_v6only = 1;
2591 udp_conf.family = AF_INET;
2594 udp_conf.local_udp_port = port;
2596 /* Open UDP socket */
2597 err = udp_sock_create(net, &udp_conf, &sock);
2599 return ERR_PTR(err);
2604 /* Create new listen socket if needed */
2605 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2606 __be16 port, u32 flags)
2608 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2609 struct vxlan_sock *vs;
2610 struct socket *sock;
2612 struct udp_tunnel_sock_cfg tunnel_cfg;
2614 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2616 return ERR_PTR(-ENOMEM);
2618 for (h = 0; h < VNI_HASH_SIZE; ++h)
2619 INIT_HLIST_HEAD(&vs->vni_list[h]);
2621 INIT_WORK(&vs->del_work, vxlan_del_work);
2623 sock = vxlan_create_sock(net, ipv6, port, flags);
2625 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2628 return ERR_CAST(sock);
2632 atomic_set(&vs->refcnt, 1);
2633 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2635 /* Initialize the vxlan udp offloads structure */
2636 vs->udp_offloads.port = port;
2637 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2638 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2640 spin_lock(&vn->sock_lock);
2641 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2642 vxlan_notify_add_rx_port(vs);
2643 spin_unlock(&vn->sock_lock);
2645 /* Mark socket as an encapsulation socket. */
2646 tunnel_cfg.sk_user_data = vs;
2647 tunnel_cfg.encap_type = 1;
2648 tunnel_cfg.encap_rcv = vxlan_rcv;
2649 tunnel_cfg.encap_destroy = NULL;
2651 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2656 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2658 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2659 struct vxlan_sock *vs = NULL;
2661 if (!vxlan->cfg.no_share) {
2662 spin_lock(&vn->sock_lock);
2663 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2664 vxlan->cfg.dst_port, vxlan->flags);
2665 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2666 spin_unlock(&vn->sock_lock);
2669 spin_unlock(&vn->sock_lock);
2672 vs = vxlan_socket_create(vxlan->net, ipv6,
2673 vxlan->cfg.dst_port, vxlan->flags);
2676 #if IS_ENABLED(CONFIG_IPV6)
2678 vxlan->vn6_sock = vs;
2681 vxlan->vn4_sock = vs;
2682 vxlan_vs_add_dev(vs, vxlan);
2686 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2688 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2689 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2692 vxlan->vn4_sock = NULL;
2693 #if IS_ENABLED(CONFIG_IPV6)
2694 vxlan->vn6_sock = NULL;
2695 if (ipv6 || metadata)
2696 ret = __vxlan_sock_add(vxlan, true);
2698 if (!ret && (!ipv6 || metadata))
2699 ret = __vxlan_sock_add(vxlan, false);
2701 vxlan_sock_release(vxlan);
2705 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2706 struct vxlan_config *conf)
2708 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2709 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2710 struct vxlan_rdst *dst = &vxlan->default_dst;
2711 unsigned short needed_headroom = ETH_HLEN;
2713 bool use_ipv6 = false;
2714 __be16 default_port = vxlan->cfg.dst_port;
2715 struct net_device *lowerdev = NULL;
2717 vxlan->net = src_net;
2719 dst->remote_vni = conf->vni;
2721 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2723 /* Unless IPv6 is explicitly requested, assume IPv4 */
2724 if (!dst->remote_ip.sa.sa_family)
2725 dst->remote_ip.sa.sa_family = AF_INET;
2727 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2728 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2729 if (!IS_ENABLED(CONFIG_IPV6))
2730 return -EPFNOSUPPORT;
2732 vxlan->flags |= VXLAN_F_IPV6;
2735 if (conf->remote_ifindex) {
2736 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2737 dst->remote_ifindex = conf->remote_ifindex;
2740 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2744 #if IS_ENABLED(CONFIG_IPV6)
2746 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2747 if (idev && idev->cnf.disable_ipv6) {
2748 pr_info("IPv6 is disabled via sysctl\n");
2755 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2757 needed_headroom = lowerdev->hard_header_len;
2761 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2766 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2767 needed_headroom += VXLAN6_HEADROOM;
2769 needed_headroom += VXLAN_HEADROOM;
2770 dev->needed_headroom = needed_headroom;
2772 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2773 if (!vxlan->cfg.dst_port)
2774 vxlan->cfg.dst_port = default_port;
2775 vxlan->flags |= conf->flags;
2777 if (!vxlan->cfg.age_interval)
2778 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2780 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2781 if (tmp->cfg.vni == conf->vni &&
2782 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2783 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2784 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2785 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2786 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2790 dev->ethtool_ops = &vxlan_ethtool_ops;
2792 /* create an fdb entry for a valid default destination */
2793 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2794 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2795 &vxlan->default_dst.remote_ip,
2796 NUD_REACHABLE|NUD_PERMANENT,
2797 NLM_F_EXCL|NLM_F_CREATE,
2798 vxlan->cfg.dst_port,
2799 vxlan->default_dst.remote_vni,
2800 vxlan->default_dst.remote_ifindex,
2806 err = register_netdevice(dev);
2808 vxlan_fdb_delete_default(vxlan);
2812 list_add(&vxlan->next, &vn->vxlan_list);
2817 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2818 u8 name_assign_type, struct vxlan_config *conf)
2820 struct nlattr *tb[IFLA_MAX+1];
2821 struct net_device *dev;
2824 memset(&tb, 0, sizeof(tb));
2826 dev = rtnl_create_link(net, name, name_assign_type,
2827 &vxlan_link_ops, tb);
2831 err = vxlan_dev_configure(net, dev, conf);
2834 return ERR_PTR(err);
2839 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2841 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2842 struct nlattr *tb[], struct nlattr *data[])
2844 struct vxlan_config conf;
2847 memset(&conf, 0, sizeof(conf));
2849 if (data[IFLA_VXLAN_ID])
2850 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2852 if (data[IFLA_VXLAN_GROUP]) {
2853 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2854 } else if (data[IFLA_VXLAN_GROUP6]) {
2855 if (!IS_ENABLED(CONFIG_IPV6))
2856 return -EPFNOSUPPORT;
2858 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2859 conf.remote_ip.sa.sa_family = AF_INET6;
2862 if (data[IFLA_VXLAN_LOCAL]) {
2863 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2864 conf.saddr.sa.sa_family = AF_INET;
2865 } else if (data[IFLA_VXLAN_LOCAL6]) {
2866 if (!IS_ENABLED(CONFIG_IPV6))
2867 return -EPFNOSUPPORT;
2869 /* TODO: respect scope id */
2870 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2871 conf.saddr.sa.sa_family = AF_INET6;
2874 if (data[IFLA_VXLAN_LINK])
2875 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2877 if (data[IFLA_VXLAN_TOS])
2878 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2880 if (data[IFLA_VXLAN_TTL])
2881 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2883 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2884 conf.flags |= VXLAN_F_LEARN;
2886 if (data[IFLA_VXLAN_AGEING])
2887 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2889 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2890 conf.flags |= VXLAN_F_PROXY;
2892 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2893 conf.flags |= VXLAN_F_RSC;
2895 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2896 conf.flags |= VXLAN_F_L2MISS;
2898 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2899 conf.flags |= VXLAN_F_L3MISS;
2901 if (data[IFLA_VXLAN_LIMIT])
2902 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2904 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2905 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2906 conf.flags |= VXLAN_F_COLLECT_METADATA;
2908 if (data[IFLA_VXLAN_PORT_RANGE]) {
2909 const struct ifla_vxlan_port_range *p
2910 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2911 conf.port_min = ntohs(p->low);
2912 conf.port_max = ntohs(p->high);
2915 if (data[IFLA_VXLAN_PORT])
2916 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2918 if (data[IFLA_VXLAN_UDP_CSUM] &&
2919 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2920 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2922 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2923 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2924 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2926 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2927 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2928 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2930 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2931 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2932 conf.flags |= VXLAN_F_REMCSUM_TX;
2934 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2935 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2936 conf.flags |= VXLAN_F_REMCSUM_RX;
2938 if (data[IFLA_VXLAN_GBP])
2939 conf.flags |= VXLAN_F_GBP;
2941 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2942 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2944 err = vxlan_dev_configure(src_net, dev, &conf);
2947 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2951 pr_info("IPv6 is disabled via sysctl\n");
2955 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
2962 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2964 struct vxlan_dev *vxlan = netdev_priv(dev);
2965 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2967 spin_lock(&vn->sock_lock);
2968 if (!hlist_unhashed(&vxlan->hlist))
2969 hlist_del_rcu(&vxlan->hlist);
2970 spin_unlock(&vn->sock_lock);
2972 gro_cells_destroy(&vxlan->gro_cells);
2973 list_del(&vxlan->next);
2974 unregister_netdevice_queue(dev, head);
2977 static size_t vxlan_get_size(const struct net_device *dev)
2980 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2981 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2982 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2983 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2984 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2985 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2986 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2987 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2988 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2989 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2990 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2991 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
2992 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2993 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2994 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2995 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2996 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2997 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2998 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2999 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3000 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3004 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3006 const struct vxlan_dev *vxlan = netdev_priv(dev);
3007 const struct vxlan_rdst *dst = &vxlan->default_dst;
3008 struct ifla_vxlan_port_range ports = {
3009 .low = htons(vxlan->cfg.port_min),
3010 .high = htons(vxlan->cfg.port_max),
3013 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3014 goto nla_put_failure;
3016 if (!vxlan_addr_any(&dst->remote_ip)) {
3017 if (dst->remote_ip.sa.sa_family == AF_INET) {
3018 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3019 dst->remote_ip.sin.sin_addr.s_addr))
3020 goto nla_put_failure;
3021 #if IS_ENABLED(CONFIG_IPV6)
3023 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3024 &dst->remote_ip.sin6.sin6_addr))
3025 goto nla_put_failure;
3030 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3031 goto nla_put_failure;
3033 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3034 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3035 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3036 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3037 goto nla_put_failure;
3038 #if IS_ENABLED(CONFIG_IPV6)
3040 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3041 &vxlan->cfg.saddr.sin6.sin6_addr))
3042 goto nla_put_failure;
3047 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3048 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3049 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3050 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3051 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3052 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3053 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3054 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3055 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3056 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3057 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3058 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3059 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3060 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3061 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3062 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3063 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3064 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3065 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3066 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3067 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3068 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3069 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3070 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3071 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3072 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3073 goto nla_put_failure;
3075 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3076 goto nla_put_failure;
3078 if (vxlan->flags & VXLAN_F_GBP &&
3079 nla_put_flag(skb, IFLA_VXLAN_GBP))
3080 goto nla_put_failure;
3082 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3083 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3084 goto nla_put_failure;
3092 static struct net *vxlan_get_link_net(const struct net_device *dev)
3094 struct vxlan_dev *vxlan = netdev_priv(dev);
3099 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3101 .maxtype = IFLA_VXLAN_MAX,
3102 .policy = vxlan_policy,
3103 .priv_size = sizeof(struct vxlan_dev),
3104 .setup = vxlan_setup,
3105 .validate = vxlan_validate,
3106 .newlink = vxlan_newlink,
3107 .dellink = vxlan_dellink,
3108 .get_size = vxlan_get_size,
3109 .fill_info = vxlan_fill_info,
3110 .get_link_net = vxlan_get_link_net,
3113 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3114 struct net_device *dev)
3116 struct vxlan_dev *vxlan, *next;
3117 LIST_HEAD(list_kill);
3119 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3120 struct vxlan_rdst *dst = &vxlan->default_dst;
3122 /* In case we created vxlan device with carrier
3123 * and we loose the carrier due to module unload
3124 * we also need to remove vxlan device. In other
3125 * cases, it's not necessary and remote_ifindex
3126 * is 0 here, so no matches.
3128 if (dst->remote_ifindex == dev->ifindex)
3129 vxlan_dellink(vxlan->dev, &list_kill);
3132 unregister_netdevice_many(&list_kill);
3135 static int vxlan_lowerdev_event(struct notifier_block *unused,
3136 unsigned long event, void *ptr)
3138 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3139 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3141 if (event == NETDEV_UNREGISTER)
3142 vxlan_handle_lowerdev_unregister(vn, dev);
3147 static struct notifier_block vxlan_notifier_block __read_mostly = {
3148 .notifier_call = vxlan_lowerdev_event,
3151 static __net_init int vxlan_init_net(struct net *net)
3153 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3156 INIT_LIST_HEAD(&vn->vxlan_list);
3157 spin_lock_init(&vn->sock_lock);
3159 for (h = 0; h < PORT_HASH_SIZE; ++h)
3160 INIT_HLIST_HEAD(&vn->sock_list[h]);
3165 static void __net_exit vxlan_exit_net(struct net *net)
3167 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3168 struct vxlan_dev *vxlan, *next;
3169 struct net_device *dev, *aux;
3173 for_each_netdev_safe(net, dev, aux)
3174 if (dev->rtnl_link_ops == &vxlan_link_ops)
3175 unregister_netdevice_queue(dev, &list);
3177 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3178 /* If vxlan->dev is in the same netns, it has already been added
3179 * to the list by the previous loop.
3181 if (!net_eq(dev_net(vxlan->dev), net)) {
3182 gro_cells_destroy(&vxlan->gro_cells);
3183 unregister_netdevice_queue(vxlan->dev, &list);
3187 unregister_netdevice_many(&list);
3191 static struct pernet_operations vxlan_net_ops = {
3192 .init = vxlan_init_net,
3193 .exit = vxlan_exit_net,
3194 .id = &vxlan_net_id,
3195 .size = sizeof(struct vxlan_net),
3198 static int __init vxlan_init_module(void)
3202 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3206 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3208 rc = register_pernet_subsys(&vxlan_net_ops);
3212 rc = register_netdevice_notifier(&vxlan_notifier_block);
3216 rc = rtnl_link_register(&vxlan_link_ops);
3222 unregister_netdevice_notifier(&vxlan_notifier_block);
3224 unregister_pernet_subsys(&vxlan_net_ops);
3226 destroy_workqueue(vxlan_wq);
3229 late_initcall(vxlan_init_module);
3231 static void __exit vxlan_cleanup_module(void)
3233 rtnl_link_unregister(&vxlan_link_ops);
3234 unregister_netdevice_notifier(&vxlan_notifier_block);
3235 destroy_workqueue(vxlan_wq);
3236 unregister_pernet_subsys(&vxlan_net_ops);
3237 /* rcu_barrier() is called by netns */
3239 module_exit(vxlan_cleanup_module);
3241 MODULE_LICENSE("GPL");
3242 MODULE_VERSION(VXLAN_VERSION);
3243 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3244 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3245 MODULE_ALIAS_RTNL_LINK("vxlan");