# Makefile for the XFRM subsystem.
#
+xfrm_interface-$(CONFIG_XFRM_INTERFACE) += xfrm_interface_core.o
+
obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \
xfrm_input.o xfrm_output.o \
xfrm_sysctl.o xfrm_replay.o xfrm_device.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * XFRM virtual interface
- *
- * Copyright (C) 2018 secunet Security Networks AG
- *
- * Author:
- * Steffen Klassert <steffen.klassert@secunet.com>
- */
-
-#include <linux/module.h>
-#include <linux/capability.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/sockios.h>
-#include <linux/icmp.h>
-#include <linux/if.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/net.h>
-#include <linux/in6.h>
-#include <linux/netdevice.h>
-#include <linux/if_link.h>
-#include <linux/if_arp.h>
-#include <linux/icmpv6.h>
-#include <linux/init.h>
-#include <linux/route.h>
-#include <linux/rtnetlink.h>
-#include <linux/netfilter_ipv6.h>
-#include <linux/slab.h>
-#include <linux/hash.h>
-
-#include <linux/uaccess.h>
-#include <linux/atomic.h>
-
-#include <net/icmp.h>
-#include <net/ip.h>
-#include <net/ipv6.h>
-#include <net/ip6_route.h>
-#include <net/ip_tunnels.h>
-#include <net/addrconf.h>
-#include <net/xfrm.h>
-#include <net/net_namespace.h>
-#include <net/dst_metadata.h>
-#include <net/netns/generic.h>
-#include <linux/etherdevice.h>
-
-static int xfrmi_dev_init(struct net_device *dev);
-static void xfrmi_dev_setup(struct net_device *dev);
-static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
-static unsigned int xfrmi_net_id __read_mostly;
-static const struct net_device_ops xfrmi_netdev_ops;
-
-#define XFRMI_HASH_BITS 8
-#define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS)
-
-struct xfrmi_net {
- /* lists for storing interfaces in use */
- struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE];
- struct xfrm_if __rcu *collect_md_xfrmi;
-};
-
-static const struct nla_policy xfrm_lwt_policy[LWT_XFRM_MAX + 1] = {
- [LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1),
- [LWT_XFRM_LINK] = NLA_POLICY_MIN(NLA_U32, 1),
-};
-
-static void xfrmi_destroy_state(struct lwtunnel_state *lwt)
-{
-}
-
-static int xfrmi_build_state(struct net *net, struct nlattr *nla,
- unsigned int family, const void *cfg,
- struct lwtunnel_state **ts,
- struct netlink_ext_ack *extack)
-{
- struct nlattr *tb[LWT_XFRM_MAX + 1];
- struct lwtunnel_state *new_state;
- struct xfrm_md_info *info;
- int ret;
-
- ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack);
- if (ret < 0)
- return ret;
-
- if (!tb[LWT_XFRM_IF_ID]) {
- NL_SET_ERR_MSG(extack, "if_id must be set");
- return -EINVAL;
- }
-
- new_state = lwtunnel_state_alloc(sizeof(*info));
- if (!new_state) {
- NL_SET_ERR_MSG(extack, "failed to create encap info");
- return -ENOMEM;
- }
-
- new_state->type = LWTUNNEL_ENCAP_XFRM;
-
- info = lwt_xfrm_info(new_state);
-
- info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]);
-
- if (tb[LWT_XFRM_LINK])
- info->link = nla_get_u32(tb[LWT_XFRM_LINK]);
-
- *ts = new_state;
- return 0;
-}
-
-static int xfrmi_fill_encap_info(struct sk_buff *skb,
- struct lwtunnel_state *lwt)
-{
- struct xfrm_md_info *info = lwt_xfrm_info(lwt);
-
- if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) ||
- (info->link && nla_put_u32(skb, LWT_XFRM_LINK, info->link)))
- return -EMSGSIZE;
-
- return 0;
-}
-
-static int xfrmi_encap_nlsize(struct lwtunnel_state *lwtstate)
-{
- return nla_total_size(sizeof(u32)) + /* LWT_XFRM_IF_ID */
- nla_total_size(sizeof(u32)); /* LWT_XFRM_LINK */
-}
-
-static int xfrmi_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
-{
- struct xfrm_md_info *a_info = lwt_xfrm_info(a);
- struct xfrm_md_info *b_info = lwt_xfrm_info(b);
-
- return memcmp(a_info, b_info, sizeof(*a_info));
-}
-
-static const struct lwtunnel_encap_ops xfrmi_encap_ops = {
- .build_state = xfrmi_build_state,
- .destroy_state = xfrmi_destroy_state,
- .fill_encap = xfrmi_fill_encap_info,
- .get_encap_size = xfrmi_encap_nlsize,
- .cmp_encap = xfrmi_encap_cmp,
- .owner = THIS_MODULE,
-};
-
-#define for_each_xfrmi_rcu(start, xi) \
- for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
-
-static u32 xfrmi_hash(u32 if_id)
-{
- return hash_32(if_id, XFRMI_HASH_BITS);
-}
-
-static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
-{
- struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
- struct xfrm_if *xi;
-
- for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) {
- if (x->if_id == xi->p.if_id &&
- (xi->dev->flags & IFF_UP))
- return xi;
- }
-
- xi = rcu_dereference(xfrmn->collect_md_xfrmi);
- if (xi && (xi->dev->flags & IFF_UP))
- return xi;
-
- return NULL;
-}
-
-static bool xfrmi_decode_session(struct sk_buff *skb,
- unsigned short family,
- struct xfrm_if_decode_session_result *res)
-{
- struct net_device *dev;
- struct xfrm_if *xi;
- int ifindex = 0;
-
- if (!secpath_exists(skb) || !skb->dev)
- return false;
-
- switch (family) {
- case AF_INET6:
- ifindex = inet6_sdif(skb);
- break;
- case AF_INET:
- ifindex = inet_sdif(skb);
- break;
- }
-
- if (ifindex) {
- struct net *net = xs_net(xfrm_input_state(skb));
-
- dev = dev_get_by_index_rcu(net, ifindex);
- } else {
- dev = skb->dev;
- }
-
- if (!dev || !(dev->flags & IFF_UP))
- return false;
- if (dev->netdev_ops != &xfrmi_netdev_ops)
- return false;
-
- xi = netdev_priv(dev);
- res->net = xi->net;
-
- if (xi->p.collect_md)
- res->if_id = xfrm_input_state(skb)->if_id;
- else
- res->if_id = xi->p.if_id;
- return true;
-}
-
-static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
-{
- struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
-
- rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
- rcu_assign_pointer(*xip, xi);
-}
-
-static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
-{
- struct xfrm_if __rcu **xip;
- struct xfrm_if *iter;
-
- for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
- (iter = rtnl_dereference(*xip)) != NULL;
- xip = &iter->next) {
- if (xi == iter) {
- rcu_assign_pointer(*xip, xi->next);
- break;
- }
- }
-}
-
-static void xfrmi_dev_free(struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
-
- gro_cells_destroy(&xi->gro_cells);
- free_percpu(dev->tstats);
-}
-
-static int xfrmi_create(struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct net *net = dev_net(dev);
- struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
- int err;
-
- dev->rtnl_link_ops = &xfrmi_link_ops;
- err = register_netdevice(dev);
- if (err < 0)
- goto out;
-
- if (xi->p.collect_md)
- rcu_assign_pointer(xfrmn->collect_md_xfrmi, xi);
- else
- xfrmi_link(xfrmn, xi);
-
- return 0;
-
-out:
- return err;
-}
-
-static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
-{
- struct xfrm_if __rcu **xip;
- struct xfrm_if *xi;
- struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
-
- for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)];
- (xi = rtnl_dereference(*xip)) != NULL;
- xip = &xi->next)
- if (xi->p.if_id == p->if_id)
- return xi;
-
- return NULL;
-}
-
-static void xfrmi_dev_uninit(struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
-
- if (xi->p.collect_md)
- RCU_INIT_POINTER(xfrmn->collect_md_xfrmi, NULL);
- else
- xfrmi_unlink(xfrmn, xi);
-}
-
-static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
-{
- skb_clear_tstamp(skb);
- skb->pkt_type = PACKET_HOST;
- skb->skb_iif = 0;
- skb->ignore_df = 0;
- skb_dst_drop(skb);
- nf_reset_ct(skb);
- nf_reset_trace(skb);
-
- if (!xnet)
- return;
-
- ipvs_reset(skb);
- secpath_reset(skb);
- skb_orphan(skb);
- skb->mark = 0;
-}
-
-static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
-{
- const struct xfrm_mode *inner_mode;
- struct net_device *dev;
- struct xfrm_state *x;
- struct xfrm_if *xi;
- bool xnet;
- int link;
-
- if (err && !secpath_exists(skb))
- return 0;
-
- x = xfrm_input_state(skb);
-
- xi = xfrmi_lookup(xs_net(x), x);
- if (!xi)
- return 1;
-
- link = skb->dev->ifindex;
- dev = xi->dev;
- skb->dev = dev;
-
- if (err) {
- dev->stats.rx_errors++;
- dev->stats.rx_dropped++;
-
- return 0;
- }
-
- xnet = !net_eq(xi->net, dev_net(skb->dev));
-
- if (xnet) {
- inner_mode = &x->inner_mode;
-
- if (x->sel.family == AF_UNSPEC) {
- inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
- if (inner_mode == NULL) {
- XFRM_INC_STATS(dev_net(skb->dev),
- LINUX_MIB_XFRMINSTATEMODEERROR);
- return -EINVAL;
- }
- }
-
- if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
- inner_mode->family))
- return -EPERM;
- }
-
- xfrmi_scrub_packet(skb, xnet);
- if (xi->p.collect_md) {
- struct metadata_dst *md_dst;
-
- md_dst = metadata_dst_alloc(0, METADATA_XFRM, GFP_ATOMIC);
- if (!md_dst)
- return -ENOMEM;
-
- md_dst->u.xfrm_info.if_id = x->if_id;
- md_dst->u.xfrm_info.link = link;
- skb_dst_set(skb, (struct dst_entry *)md_dst);
- }
- dev_sw_netstats_rx_add(dev, skb->len);
-
- return 0;
-}
-
-static int
-xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct net_device_stats *stats = &xi->dev->stats;
- struct dst_entry *dst = skb_dst(skb);
- unsigned int length = skb->len;
- struct net_device *tdev;
- struct xfrm_state *x;
- int err = -1;
- u32 if_id;
- int mtu;
-
- if (xi->p.collect_md) {
- struct xfrm_md_info *md_info = skb_xfrm_md_info(skb);
-
- if (unlikely(!md_info))
- return -EINVAL;
-
- if_id = md_info->if_id;
- fl->flowi_oif = md_info->link;
- } else {
- if_id = xi->p.if_id;
- }
-
- dst_hold(dst);
- dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, if_id);
- if (IS_ERR(dst)) {
- err = PTR_ERR(dst);
- dst = NULL;
- goto tx_err_link_failure;
- }
-
- x = dst->xfrm;
- if (!x)
- goto tx_err_link_failure;
-
- if (x->if_id != if_id)
- goto tx_err_link_failure;
-
- tdev = dst->dev;
-
- if (tdev == dev) {
- stats->collisions++;
- net_warn_ratelimited("%s: Local routing loop detected!\n",
- dev->name);
- goto tx_err_dst_release;
- }
-
- mtu = dst_mtu(dst);
- if ((!skb_is_gso(skb) && skb->len > mtu) ||
- (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) {
- skb_dst_update_pmtu_no_confirm(skb, mtu);
-
- if (skb->protocol == htons(ETH_P_IPV6)) {
- if (mtu < IPV6_MIN_MTU)
- mtu = IPV6_MIN_MTU;
-
- if (skb->len > 1280)
- icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
- else
- goto xmit;
- } else {
- if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
- goto xmit;
- icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
- htonl(mtu));
- }
-
- dst_release(dst);
- return -EMSGSIZE;
- }
-
-xmit:
- xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
- skb_dst_set(skb, dst);
- skb->dev = tdev;
-
- err = dst_output(xi->net, skb->sk, skb);
- if (net_xmit_eval(err) == 0) {
- dev_sw_netstats_tx_add(dev, 1, length);
- } else {
- stats->tx_errors++;
- stats->tx_aborted_errors++;
- }
-
- return 0;
-tx_err_link_failure:
- stats->tx_carrier_errors++;
- dst_link_failure(skb);
-tx_err_dst_release:
- dst_release(dst);
- return err;
-}
-
-static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct net_device_stats *stats = &xi->dev->stats;
- struct dst_entry *dst = skb_dst(skb);
- struct flowi fl;
- int ret;
-
- memset(&fl, 0, sizeof(fl));
-
- switch (skb->protocol) {
- case htons(ETH_P_IPV6):
- xfrm_decode_session(skb, &fl, AF_INET6);
- memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
- if (!dst) {
- fl.u.ip6.flowi6_oif = dev->ifindex;
- fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
- dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6);
- if (dst->error) {
- dst_release(dst);
- stats->tx_carrier_errors++;
- goto tx_err;
- }
- skb_dst_set(skb, dst);
- }
- break;
- case htons(ETH_P_IP):
- xfrm_decode_session(skb, &fl, AF_INET);
- memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
- if (!dst) {
- struct rtable *rt;
-
- fl.u.ip4.flowi4_oif = dev->ifindex;
- fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
- rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4);
- if (IS_ERR(rt)) {
- stats->tx_carrier_errors++;
- goto tx_err;
- }
- skb_dst_set(skb, &rt->dst);
- }
- break;
- default:
- goto tx_err;
- }
-
- fl.flowi_oif = xi->p.link;
-
- ret = xfrmi_xmit2(skb, dev, &fl);
- if (ret < 0)
- goto tx_err;
-
- return NETDEV_TX_OK;
-
-tx_err:
- stats->tx_errors++;
- stats->tx_dropped++;
- kfree_skb(skb);
- return NETDEV_TX_OK;
-}
-
-static int xfrmi4_err(struct sk_buff *skb, u32 info)
-{
- const struct iphdr *iph = (const struct iphdr *)skb->data;
- struct net *net = dev_net(skb->dev);
- int protocol = iph->protocol;
- struct ip_comp_hdr *ipch;
- struct ip_esp_hdr *esph;
- struct ip_auth_hdr *ah ;
- struct xfrm_state *x;
- struct xfrm_if *xi;
- __be32 spi;
-
- switch (protocol) {
- case IPPROTO_ESP:
- esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
- spi = esph->spi;
- break;
- case IPPROTO_AH:
- ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
- spi = ah->spi;
- break;
- case IPPROTO_COMP:
- ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
- spi = htonl(ntohs(ipch->cpi));
- break;
- default:
- return 0;
- }
-
- switch (icmp_hdr(skb)->type) {
- case ICMP_DEST_UNREACH:
- if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
- return 0;
- break;
- case ICMP_REDIRECT:
- break;
- default:
- return 0;
- }
-
- x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
- spi, protocol, AF_INET);
- if (!x)
- return 0;
-
- xi = xfrmi_lookup(net, x);
- if (!xi) {
- xfrm_state_put(x);
- return -1;
- }
-
- if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
- ipv4_update_pmtu(skb, net, info, 0, protocol);
- else
- ipv4_redirect(skb, net, 0, protocol);
- xfrm_state_put(x);
-
- return 0;
-}
-
-static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
- u8 type, u8 code, int offset, __be32 info)
-{
- const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
- struct net *net = dev_net(skb->dev);
- int protocol = iph->nexthdr;
- struct ip_comp_hdr *ipch;
- struct ip_esp_hdr *esph;
- struct ip_auth_hdr *ah;
- struct xfrm_state *x;
- struct xfrm_if *xi;
- __be32 spi;
-
- switch (protocol) {
- case IPPROTO_ESP:
- esph = (struct ip_esp_hdr *)(skb->data + offset);
- spi = esph->spi;
- break;
- case IPPROTO_AH:
- ah = (struct ip_auth_hdr *)(skb->data + offset);
- spi = ah->spi;
- break;
- case IPPROTO_COMP:
- ipch = (struct ip_comp_hdr *)(skb->data + offset);
- spi = htonl(ntohs(ipch->cpi));
- break;
- default:
- return 0;
- }
-
- if (type != ICMPV6_PKT_TOOBIG &&
- type != NDISC_REDIRECT)
- return 0;
-
- x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
- spi, protocol, AF_INET6);
- if (!x)
- return 0;
-
- xi = xfrmi_lookup(net, x);
- if (!xi) {
- xfrm_state_put(x);
- return -1;
- }
-
- if (type == NDISC_REDIRECT)
- ip6_redirect(skb, net, skb->dev->ifindex, 0,
- sock_net_uid(net, NULL));
- else
- ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
- xfrm_state_put(x);
-
- return 0;
-}
-
-static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
-{
- if (xi->p.link != p->link)
- return -EINVAL;
-
- xi->p.if_id = p->if_id;
-
- return 0;
-}
-
-static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
-{
- struct net *net = xi->net;
- struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
- int err;
-
- xfrmi_unlink(xfrmn, xi);
- synchronize_net();
- err = xfrmi_change(xi, p);
- xfrmi_link(xfrmn, xi);
- netdev_state_change(xi->dev);
- return err;
-}
-
-static int xfrmi_get_iflink(const struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
-
- return xi->p.link;
-}
-
-static const struct net_device_ops xfrmi_netdev_ops = {
- .ndo_init = xfrmi_dev_init,
- .ndo_uninit = xfrmi_dev_uninit,
- .ndo_start_xmit = xfrmi_xmit,
- .ndo_get_stats64 = dev_get_tstats64,
- .ndo_get_iflink = xfrmi_get_iflink,
-};
-
-static void xfrmi_dev_setup(struct net_device *dev)
-{
- dev->netdev_ops = &xfrmi_netdev_ops;
- dev->header_ops = &ip_tunnel_header_ops;
- dev->type = ARPHRD_NONE;
- dev->mtu = ETH_DATA_LEN;
- dev->min_mtu = ETH_MIN_MTU;
- dev->max_mtu = IP_MAX_MTU;
- dev->flags = IFF_NOARP;
- dev->needs_free_netdev = true;
- dev->priv_destructor = xfrmi_dev_free;
- netif_keep_dst(dev);
-
- eth_broadcast_addr(dev->broadcast);
-}
-
-#define XFRMI_FEATURES (NETIF_F_SG | \
- NETIF_F_FRAGLIST | \
- NETIF_F_GSO_SOFTWARE | \
- NETIF_F_HW_CSUM)
-
-static int xfrmi_dev_init(struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link);
- int err;
-
- dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
- if (!dev->tstats)
- return -ENOMEM;
-
- err = gro_cells_init(&xi->gro_cells, dev);
- if (err) {
- free_percpu(dev->tstats);
- return err;
- }
-
- dev->features |= NETIF_F_LLTX;
- dev->features |= XFRMI_FEATURES;
- dev->hw_features |= XFRMI_FEATURES;
-
- if (phydev) {
- dev->needed_headroom = phydev->needed_headroom;
- dev->needed_tailroom = phydev->needed_tailroom;
-
- if (is_zero_ether_addr(dev->dev_addr))
- eth_hw_addr_inherit(dev, phydev);
- if (is_zero_ether_addr(dev->broadcast))
- memcpy(dev->broadcast, phydev->broadcast,
- dev->addr_len);
- } else {
- eth_hw_addr_random(dev);
- eth_broadcast_addr(dev->broadcast);
- }
-
- return 0;
-}
-
-static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
- struct netlink_ext_ack *extack)
-{
- return 0;
-}
-
-static void xfrmi_netlink_parms(struct nlattr *data[],
- struct xfrm_if_parms *parms)
-{
- memset(parms, 0, sizeof(*parms));
-
- if (!data)
- return;
-
- if (data[IFLA_XFRM_LINK])
- parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
-
- if (data[IFLA_XFRM_IF_ID])
- parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
-
- if (data[IFLA_XFRM_COLLECT_METADATA])
- parms->collect_md = true;
-}
-
-static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
- struct nlattr *tb[], struct nlattr *data[],
- struct netlink_ext_ack *extack)
-{
- struct net *net = dev_net(dev);
- struct xfrm_if_parms p = {};
- struct xfrm_if *xi;
- int err;
-
- xfrmi_netlink_parms(data, &p);
- if (p.collect_md) {
- struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
-
- if (p.link || p.if_id) {
- NL_SET_ERR_MSG(extack, "link and if_id must be zero");
- return -EINVAL;
- }
-
- if (rtnl_dereference(xfrmn->collect_md_xfrmi))
- return -EEXIST;
-
- } else {
- if (!p.if_id) {
- NL_SET_ERR_MSG(extack, "if_id must be non zero");
- return -EINVAL;
- }
-
- xi = xfrmi_locate(net, &p);
- if (xi)
- return -EEXIST;
- }
-
- xi = netdev_priv(dev);
- xi->p = p;
- xi->net = net;
- xi->dev = dev;
-
- err = xfrmi_create(dev);
- return err;
-}
-
-static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
-{
- unregister_netdevice_queue(dev, head);
-}
-
-static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
- struct nlattr *data[],
- struct netlink_ext_ack *extack)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct net *net = xi->net;
- struct xfrm_if_parms p = {};
-
- xfrmi_netlink_parms(data, &p);
- if (!p.if_id) {
- NL_SET_ERR_MSG(extack, "if_id must be non zero");
- return -EINVAL;
- }
-
- if (p.collect_md) {
- NL_SET_ERR_MSG(extack, "collect_md can't be changed");
- return -EINVAL;
- }
-
- xi = xfrmi_locate(net, &p);
- if (!xi) {
- xi = netdev_priv(dev);
- } else {
- if (xi->dev != dev)
- return -EEXIST;
- if (xi->p.collect_md) {
- NL_SET_ERR_MSG(extack,
- "device can't be changed to collect_md");
- return -EINVAL;
- }
- }
-
- return xfrmi_update(xi, &p);
-}
-
-static size_t xfrmi_get_size(const struct net_device *dev)
-{
- return
- /* IFLA_XFRM_LINK */
- nla_total_size(4) +
- /* IFLA_XFRM_IF_ID */
- nla_total_size(4) +
- /* IFLA_XFRM_COLLECT_METADATA */
- nla_total_size(0) +
- 0;
-}
-
-static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
- struct xfrm_if_parms *parm = &xi->p;
-
- if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
- nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id) ||
- (xi->p.collect_md && nla_put_flag(skb, IFLA_XFRM_COLLECT_METADATA)))
- goto nla_put_failure;
- return 0;
-
-nla_put_failure:
- return -EMSGSIZE;
-}
-
-static struct net *xfrmi_get_link_net(const struct net_device *dev)
-{
- struct xfrm_if *xi = netdev_priv(dev);
-
- return xi->net;
-}
-
-static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
- [IFLA_XFRM_UNSPEC] = { .strict_start_type = IFLA_XFRM_COLLECT_METADATA },
- [IFLA_XFRM_LINK] = { .type = NLA_U32 },
- [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
- [IFLA_XFRM_COLLECT_METADATA] = { .type = NLA_FLAG },
-};
-
-static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
- .kind = "xfrm",
- .maxtype = IFLA_XFRM_MAX,
- .policy = xfrmi_policy,
- .priv_size = sizeof(struct xfrm_if),
- .setup = xfrmi_dev_setup,
- .validate = xfrmi_validate,
- .newlink = xfrmi_newlink,
- .dellink = xfrmi_dellink,
- .changelink = xfrmi_changelink,
- .get_size = xfrmi_get_size,
- .fill_info = xfrmi_fill_info,
- .get_link_net = xfrmi_get_link_net,
-};
-
-static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list)
-{
- struct net *net;
- LIST_HEAD(list);
-
- rtnl_lock();
- list_for_each_entry(net, net_exit_list, exit_list) {
- struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
- struct xfrm_if __rcu **xip;
- struct xfrm_if *xi;
- int i;
-
- for (i = 0; i < XFRMI_HASH_SIZE; i++) {
- for (xip = &xfrmn->xfrmi[i];
- (xi = rtnl_dereference(*xip)) != NULL;
- xip = &xi->next)
- unregister_netdevice_queue(xi->dev, &list);
- }
- xi = rtnl_dereference(xfrmn->collect_md_xfrmi);
- if (xi)
- unregister_netdevice_queue(xi->dev, &list);
- }
- unregister_netdevice_many(&list);
- rtnl_unlock();
-}
-
-static struct pernet_operations xfrmi_net_ops = {
- .exit_batch = xfrmi_exit_batch_net,
- .id = &xfrmi_net_id,
- .size = sizeof(struct xfrmi_net),
-};
-
-static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
- .handler = xfrm6_rcv,
- .input_handler = xfrm_input,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi6_err,
- .priority = 10,
-};
-
-static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
- .handler = xfrm6_rcv,
- .input_handler = xfrm_input,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi6_err,
- .priority = 10,
-};
-
-static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
- .handler = xfrm6_rcv,
- .input_handler = xfrm_input,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi6_err,
- .priority = 10,
-};
-
-#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
-static int xfrmi6_rcv_tunnel(struct sk_buff *skb)
-{
- const xfrm_address_t *saddr;
- __be32 spi;
-
- saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
- spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
-
- return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
-}
-
-static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = {
- .handler = xfrmi6_rcv_tunnel,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi6_err,
- .priority = 2,
-};
-
-static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = {
- .handler = xfrmi6_rcv_tunnel,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi6_err,
- .priority = 2,
-};
-#endif
-
-static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
- .handler = xfrm4_rcv,
- .input_handler = xfrm_input,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi4_err,
- .priority = 10,
-};
-
-static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
- .handler = xfrm4_rcv,
- .input_handler = xfrm_input,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi4_err,
- .priority = 10,
-};
-
-static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
- .handler = xfrm4_rcv,
- .input_handler = xfrm_input,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi4_err,
- .priority = 10,
-};
-
-#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
-static int xfrmi4_rcv_tunnel(struct sk_buff *skb)
-{
- return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
-}
-
-static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = {
- .handler = xfrmi4_rcv_tunnel,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi4_err,
- .priority = 3,
-};
-
-static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = {
- .handler = xfrmi4_rcv_tunnel,
- .cb_handler = xfrmi_rcv_cb,
- .err_handler = xfrmi4_err,
- .priority = 2,
-};
-#endif
-
-static int __init xfrmi4_init(void)
-{
- int err;
-
- err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
- if (err < 0)
- goto xfrm_proto_esp_failed;
- err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
- if (err < 0)
- goto xfrm_proto_ah_failed;
- err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
- if (err < 0)
- goto xfrm_proto_comp_failed;
-#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
- err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET);
- if (err < 0)
- goto xfrm_tunnel_ipip_failed;
- err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6);
- if (err < 0)
- goto xfrm_tunnel_ipip6_failed;
-#endif
-
- return 0;
-
-#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
-xfrm_tunnel_ipip6_failed:
- xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
-xfrm_tunnel_ipip_failed:
- xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
-#endif
-xfrm_proto_comp_failed:
- xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
-xfrm_proto_ah_failed:
- xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
-xfrm_proto_esp_failed:
- return err;
-}
-
-static void xfrmi4_fini(void)
-{
-#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
- xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6);
- xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
-#endif
- xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
- xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
- xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
-}
-
-static int __init xfrmi6_init(void)
-{
- int err;
-
- err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
- if (err < 0)
- goto xfrm_proto_esp_failed;
- err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
- if (err < 0)
- goto xfrm_proto_ah_failed;
- err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
- if (err < 0)
- goto xfrm_proto_comp_failed;
-#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
- err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6);
- if (err < 0)
- goto xfrm_tunnel_ipv6_failed;
- err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET);
- if (err < 0)
- goto xfrm_tunnel_ip6ip_failed;
-#endif
-
- return 0;
-
-#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
-xfrm_tunnel_ip6ip_failed:
- xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
-xfrm_tunnel_ipv6_failed:
- xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
-#endif
-xfrm_proto_comp_failed:
- xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
-xfrm_proto_ah_failed:
- xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
-xfrm_proto_esp_failed:
- return err;
-}
-
-static void xfrmi6_fini(void)
-{
-#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
- xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET);
- xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
-#endif
- xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
- xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
- xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
-}
-
-static const struct xfrm_if_cb xfrm_if_cb = {
- .decode_session = xfrmi_decode_session,
-};
-
-static int __init xfrmi_init(void)
-{
- const char *msg;
- int err;
-
- pr_info("IPsec XFRM device driver\n");
-
- msg = "tunnel device";
- err = register_pernet_device(&xfrmi_net_ops);
- if (err < 0)
- goto pernet_dev_failed;
-
- msg = "xfrm4 protocols";
- err = xfrmi4_init();
- if (err < 0)
- goto xfrmi4_failed;
-
- msg = "xfrm6 protocols";
- err = xfrmi6_init();
- if (err < 0)
- goto xfrmi6_failed;
-
-
- msg = "netlink interface";
- err = rtnl_link_register(&xfrmi_link_ops);
- if (err < 0)
- goto rtnl_link_failed;
-
- lwtunnel_encap_add_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM);
-
- xfrm_if_register_cb(&xfrm_if_cb);
-
- return err;
-
-rtnl_link_failed:
- xfrmi6_fini();
-xfrmi6_failed:
- xfrmi4_fini();
-xfrmi4_failed:
- unregister_pernet_device(&xfrmi_net_ops);
-pernet_dev_failed:
- pr_err("xfrmi init: failed to register %s\n", msg);
- return err;
-}
-
-static void __exit xfrmi_fini(void)
-{
- xfrm_if_unregister_cb();
- lwtunnel_encap_del_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM);
- rtnl_link_unregister(&xfrmi_link_ops);
- xfrmi4_fini();
- xfrmi6_fini();
- unregister_pernet_device(&xfrmi_net_ops);
-}
-
-module_init(xfrmi_init);
-module_exit(xfrmi_fini);
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_RTNL_LINK("xfrm");
-MODULE_ALIAS_NETDEV("xfrm0");
-MODULE_AUTHOR("Steffen Klassert");
-MODULE_DESCRIPTION("XFRM virtual interface");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * XFRM virtual interface
+ *
+ * Copyright (C) 2018 secunet Security Networks AG
+ *
+ * Author:
+ * Steffen Klassert <steffen.klassert@secunet.com>
+ */
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/sockios.h>
+#include <linux/icmp.h>
+#include <linux/if.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_link.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <linux/route.h>
+#include <linux/rtnetlink.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/slab.h>
+#include <linux/hash.h>
+
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/ip_tunnels.h>
+#include <net/addrconf.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/dst_metadata.h>
+#include <net/netns/generic.h>
+#include <linux/etherdevice.h>
+
+static int xfrmi_dev_init(struct net_device *dev);
+static void xfrmi_dev_setup(struct net_device *dev);
+static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
+static unsigned int xfrmi_net_id __read_mostly;
+static const struct net_device_ops xfrmi_netdev_ops;
+
+#define XFRMI_HASH_BITS 8
+#define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS)
+
+struct xfrmi_net {
+ /* lists for storing interfaces in use */
+ struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE];
+ struct xfrm_if __rcu *collect_md_xfrmi;
+};
+
+static const struct nla_policy xfrm_lwt_policy[LWT_XFRM_MAX + 1] = {
+ [LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1),
+ [LWT_XFRM_LINK] = NLA_POLICY_MIN(NLA_U32, 1),
+};
+
+static void xfrmi_destroy_state(struct lwtunnel_state *lwt)
+{
+}
+
+static int xfrmi_build_state(struct net *net, struct nlattr *nla,
+ unsigned int family, const void *cfg,
+ struct lwtunnel_state **ts,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[LWT_XFRM_MAX + 1];
+ struct lwtunnel_state *new_state;
+ struct xfrm_md_info *info;
+ int ret;
+
+ ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack);
+ if (ret < 0)
+ return ret;
+
+ if (!tb[LWT_XFRM_IF_ID]) {
+ NL_SET_ERR_MSG(extack, "if_id must be set");
+ return -EINVAL;
+ }
+
+ new_state = lwtunnel_state_alloc(sizeof(*info));
+ if (!new_state) {
+ NL_SET_ERR_MSG(extack, "failed to create encap info");
+ return -ENOMEM;
+ }
+
+ new_state->type = LWTUNNEL_ENCAP_XFRM;
+
+ info = lwt_xfrm_info(new_state);
+
+ info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]);
+
+ if (tb[LWT_XFRM_LINK])
+ info->link = nla_get_u32(tb[LWT_XFRM_LINK]);
+
+ *ts = new_state;
+ return 0;
+}
+
+static int xfrmi_fill_encap_info(struct sk_buff *skb,
+ struct lwtunnel_state *lwt)
+{
+ struct xfrm_md_info *info = lwt_xfrm_info(lwt);
+
+ if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) ||
+ (info->link && nla_put_u32(skb, LWT_XFRM_LINK, info->link)))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int xfrmi_encap_nlsize(struct lwtunnel_state *lwtstate)
+{
+ return nla_total_size(sizeof(u32)) + /* LWT_XFRM_IF_ID */
+ nla_total_size(sizeof(u32)); /* LWT_XFRM_LINK */
+}
+
+static int xfrmi_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
+{
+ struct xfrm_md_info *a_info = lwt_xfrm_info(a);
+ struct xfrm_md_info *b_info = lwt_xfrm_info(b);
+
+ return memcmp(a_info, b_info, sizeof(*a_info));
+}
+
+static const struct lwtunnel_encap_ops xfrmi_encap_ops = {
+ .build_state = xfrmi_build_state,
+ .destroy_state = xfrmi_destroy_state,
+ .fill_encap = xfrmi_fill_encap_info,
+ .get_encap_size = xfrmi_encap_nlsize,
+ .cmp_encap = xfrmi_encap_cmp,
+ .owner = THIS_MODULE,
+};
+
+#define for_each_xfrmi_rcu(start, xi) \
+ for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
+
+static u32 xfrmi_hash(u32 if_id)
+{
+ return hash_32(if_id, XFRMI_HASH_BITS);
+}
+
+static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
+{
+ struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
+ struct xfrm_if *xi;
+
+ for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) {
+ if (x->if_id == xi->p.if_id &&
+ (xi->dev->flags & IFF_UP))
+ return xi;
+ }
+
+ xi = rcu_dereference(xfrmn->collect_md_xfrmi);
+ if (xi && (xi->dev->flags & IFF_UP))
+ return xi;
+
+ return NULL;
+}
+
+static bool xfrmi_decode_session(struct sk_buff *skb,
+ unsigned short family,
+ struct xfrm_if_decode_session_result *res)
+{
+ struct net_device *dev;
+ struct xfrm_if *xi;
+ int ifindex = 0;
+
+ if (!secpath_exists(skb) || !skb->dev)
+ return false;
+
+ switch (family) {
+ case AF_INET6:
+ ifindex = inet6_sdif(skb);
+ break;
+ case AF_INET:
+ ifindex = inet_sdif(skb);
+ break;
+ }
+
+ if (ifindex) {
+ struct net *net = xs_net(xfrm_input_state(skb));
+
+ dev = dev_get_by_index_rcu(net, ifindex);
+ } else {
+ dev = skb->dev;
+ }
+
+ if (!dev || !(dev->flags & IFF_UP))
+ return false;
+ if (dev->netdev_ops != &xfrmi_netdev_ops)
+ return false;
+
+ xi = netdev_priv(dev);
+ res->net = xi->net;
+
+ if (xi->p.collect_md)
+ res->if_id = xfrm_input_state(skb)->if_id;
+ else
+ res->if_id = xi->p.if_id;
+ return true;
+}
+
+static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
+{
+ struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
+
+ rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
+ rcu_assign_pointer(*xip, xi);
+}
+
+static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
+{
+ struct xfrm_if __rcu **xip;
+ struct xfrm_if *iter;
+
+ for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
+ (iter = rtnl_dereference(*xip)) != NULL;
+ xip = &iter->next) {
+ if (xi == iter) {
+ rcu_assign_pointer(*xip, xi->next);
+ break;
+ }
+ }
+}
+
+static void xfrmi_dev_free(struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+
+ gro_cells_destroy(&xi->gro_cells);
+ free_percpu(dev->tstats);
+}
+
+static int xfrmi_create(struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
+ int err;
+
+ dev->rtnl_link_ops = &xfrmi_link_ops;
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto out;
+
+ if (xi->p.collect_md)
+ rcu_assign_pointer(xfrmn->collect_md_xfrmi, xi);
+ else
+ xfrmi_link(xfrmn, xi);
+
+ return 0;
+
+out:
+ return err;
+}
+
+static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
+{
+ struct xfrm_if __rcu **xip;
+ struct xfrm_if *xi;
+ struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
+
+ for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)];
+ (xi = rtnl_dereference(*xip)) != NULL;
+ xip = &xi->next)
+ if (xi->p.if_id == p->if_id)
+ return xi;
+
+ return NULL;
+}
+
+static void xfrmi_dev_uninit(struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
+
+ if (xi->p.collect_md)
+ RCU_INIT_POINTER(xfrmn->collect_md_xfrmi, NULL);
+ else
+ xfrmi_unlink(xfrmn, xi);
+}
+
+static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
+{
+ skb_clear_tstamp(skb);
+ skb->pkt_type = PACKET_HOST;
+ skb->skb_iif = 0;
+ skb->ignore_df = 0;
+ skb_dst_drop(skb);
+ nf_reset_ct(skb);
+ nf_reset_trace(skb);
+
+ if (!xnet)
+ return;
+
+ ipvs_reset(skb);
+ secpath_reset(skb);
+ skb_orphan(skb);
+ skb->mark = 0;
+}
+
+static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
+{
+ const struct xfrm_mode *inner_mode;
+ struct net_device *dev;
+ struct xfrm_state *x;
+ struct xfrm_if *xi;
+ bool xnet;
+ int link;
+
+ if (err && !secpath_exists(skb))
+ return 0;
+
+ x = xfrm_input_state(skb);
+
+ xi = xfrmi_lookup(xs_net(x), x);
+ if (!xi)
+ return 1;
+
+ link = skb->dev->ifindex;
+ dev = xi->dev;
+ skb->dev = dev;
+
+ if (err) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_dropped++;
+
+ return 0;
+ }
+
+ xnet = !net_eq(xi->net, dev_net(skb->dev));
+
+ if (xnet) {
+ inner_mode = &x->inner_mode;
+
+ if (x->sel.family == AF_UNSPEC) {
+ inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
+ if (inner_mode == NULL) {
+ XFRM_INC_STATS(dev_net(skb->dev),
+ LINUX_MIB_XFRMINSTATEMODEERROR);
+ return -EINVAL;
+ }
+ }
+
+ if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
+ inner_mode->family))
+ return -EPERM;
+ }
+
+ xfrmi_scrub_packet(skb, xnet);
+ if (xi->p.collect_md) {
+ struct metadata_dst *md_dst;
+
+ md_dst = metadata_dst_alloc(0, METADATA_XFRM, GFP_ATOMIC);
+ if (!md_dst)
+ return -ENOMEM;
+
+ md_dst->u.xfrm_info.if_id = x->if_id;
+ md_dst->u.xfrm_info.link = link;
+ skb_dst_set(skb, (struct dst_entry *)md_dst);
+ }
+ dev_sw_netstats_rx_add(dev, skb->len);
+
+ return 0;
+}
+
+static int
+xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct net_device_stats *stats = &xi->dev->stats;
+ struct dst_entry *dst = skb_dst(skb);
+ unsigned int length = skb->len;
+ struct net_device *tdev;
+ struct xfrm_state *x;
+ int err = -1;
+ u32 if_id;
+ int mtu;
+
+ if (xi->p.collect_md) {
+ struct xfrm_md_info *md_info = skb_xfrm_md_info(skb);
+
+ if (unlikely(!md_info))
+ return -EINVAL;
+
+ if_id = md_info->if_id;
+ fl->flowi_oif = md_info->link;
+ } else {
+ if_id = xi->p.if_id;
+ }
+
+ dst_hold(dst);
+ dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, if_id);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ dst = NULL;
+ goto tx_err_link_failure;
+ }
+
+ x = dst->xfrm;
+ if (!x)
+ goto tx_err_link_failure;
+
+ if (x->if_id != if_id)
+ goto tx_err_link_failure;
+
+ tdev = dst->dev;
+
+ if (tdev == dev) {
+ stats->collisions++;
+ net_warn_ratelimited("%s: Local routing loop detected!\n",
+ dev->name);
+ goto tx_err_dst_release;
+ }
+
+ mtu = dst_mtu(dst);
+ if ((!skb_is_gso(skb) && skb->len > mtu) ||
+ (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) {
+ skb_dst_update_pmtu_no_confirm(skb, mtu);
+
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+
+ if (skb->len > 1280)
+ icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ else
+ goto xmit;
+ } else {
+ if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
+ goto xmit;
+ icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ }
+
+ dst_release(dst);
+ return -EMSGSIZE;
+ }
+
+xmit:
+ xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
+ skb_dst_set(skb, dst);
+ skb->dev = tdev;
+
+ err = dst_output(xi->net, skb->sk, skb);
+ if (net_xmit_eval(err) == 0) {
+ dev_sw_netstats_tx_add(dev, 1, length);
+ } else {
+ stats->tx_errors++;
+ stats->tx_aborted_errors++;
+ }
+
+ return 0;
+tx_err_link_failure:
+ stats->tx_carrier_errors++;
+ dst_link_failure(skb);
+tx_err_dst_release:
+ dst_release(dst);
+ return err;
+}
+
+static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct net_device_stats *stats = &xi->dev->stats;
+ struct dst_entry *dst = skb_dst(skb);
+ struct flowi fl;
+ int ret;
+
+ memset(&fl, 0, sizeof(fl));
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IPV6):
+ xfrm_decode_session(skb, &fl, AF_INET6);
+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+ if (!dst) {
+ fl.u.ip6.flowi6_oif = dev->ifindex;
+ fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
+ dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6);
+ if (dst->error) {
+ dst_release(dst);
+ stats->tx_carrier_errors++;
+ goto tx_err;
+ }
+ skb_dst_set(skb, dst);
+ }
+ break;
+ case htons(ETH_P_IP):
+ xfrm_decode_session(skb, &fl, AF_INET);
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+ if (!dst) {
+ struct rtable *rt;
+
+ fl.u.ip4.flowi4_oif = dev->ifindex;
+ fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
+ rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4);
+ if (IS_ERR(rt)) {
+ stats->tx_carrier_errors++;
+ goto tx_err;
+ }
+ skb_dst_set(skb, &rt->dst);
+ }
+ break;
+ default:
+ goto tx_err;
+ }
+
+ fl.flowi_oif = xi->p.link;
+
+ ret = xfrmi_xmit2(skb, dev, &fl);
+ if (ret < 0)
+ goto tx_err;
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int xfrmi4_err(struct sk_buff *skb, u32 info)
+{
+ const struct iphdr *iph = (const struct iphdr *)skb->data;
+ struct net *net = dev_net(skb->dev);
+ int protocol = iph->protocol;
+ struct ip_comp_hdr *ipch;
+ struct ip_esp_hdr *esph;
+ struct ip_auth_hdr *ah ;
+ struct xfrm_state *x;
+ struct xfrm_if *xi;
+ __be32 spi;
+
+ switch (protocol) {
+ case IPPROTO_ESP:
+ esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
+ spi = esph->spi;
+ break;
+ case IPPROTO_AH:
+ ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
+ spi = ah->spi;
+ break;
+ case IPPROTO_COMP:
+ ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
+ spi = htonl(ntohs(ipch->cpi));
+ break;
+ default:
+ return 0;
+ }
+
+ switch (icmp_hdr(skb)->type) {
+ case ICMP_DEST_UNREACH:
+ if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
+ return 0;
+ break;
+ case ICMP_REDIRECT:
+ break;
+ default:
+ return 0;
+ }
+
+ x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+ spi, protocol, AF_INET);
+ if (!x)
+ return 0;
+
+ xi = xfrmi_lookup(net, x);
+ if (!xi) {
+ xfrm_state_put(x);
+ return -1;
+ }
+
+ if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
+ ipv4_update_pmtu(skb, net, info, 0, protocol);
+ else
+ ipv4_redirect(skb, net, 0, protocol);
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
+ struct net *net = dev_net(skb->dev);
+ int protocol = iph->nexthdr;
+ struct ip_comp_hdr *ipch;
+ struct ip_esp_hdr *esph;
+ struct ip_auth_hdr *ah;
+ struct xfrm_state *x;
+ struct xfrm_if *xi;
+ __be32 spi;
+
+ switch (protocol) {
+ case IPPROTO_ESP:
+ esph = (struct ip_esp_hdr *)(skb->data + offset);
+ spi = esph->spi;
+ break;
+ case IPPROTO_AH:
+ ah = (struct ip_auth_hdr *)(skb->data + offset);
+ spi = ah->spi;
+ break;
+ case IPPROTO_COMP:
+ ipch = (struct ip_comp_hdr *)(skb->data + offset);
+ spi = htonl(ntohs(ipch->cpi));
+ break;
+ default:
+ return 0;
+ }
+
+ if (type != ICMPV6_PKT_TOOBIG &&
+ type != NDISC_REDIRECT)
+ return 0;
+
+ x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+ spi, protocol, AF_INET6);
+ if (!x)
+ return 0;
+
+ xi = xfrmi_lookup(net, x);
+ if (!xi) {
+ xfrm_state_put(x);
+ return -1;
+ }
+
+ if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0,
+ sock_net_uid(net, NULL));
+ else
+ ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
+ xfrm_state_put(x);
+
+ return 0;
+}
+
+static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
+{
+ if (xi->p.link != p->link)
+ return -EINVAL;
+
+ xi->p.if_id = p->if_id;
+
+ return 0;
+}
+
+static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
+{
+ struct net *net = xi->net;
+ struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
+ int err;
+
+ xfrmi_unlink(xfrmn, xi);
+ synchronize_net();
+ err = xfrmi_change(xi, p);
+ xfrmi_link(xfrmn, xi);
+ netdev_state_change(xi->dev);
+ return err;
+}
+
+static int xfrmi_get_iflink(const struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+
+ return xi->p.link;
+}
+
+static const struct net_device_ops xfrmi_netdev_ops = {
+ .ndo_init = xfrmi_dev_init,
+ .ndo_uninit = xfrmi_dev_uninit,
+ .ndo_start_xmit = xfrmi_xmit,
+ .ndo_get_stats64 = dev_get_tstats64,
+ .ndo_get_iflink = xfrmi_get_iflink,
+};
+
+static void xfrmi_dev_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &xfrmi_netdev_ops;
+ dev->header_ops = &ip_tunnel_header_ops;
+ dev->type = ARPHRD_NONE;
+ dev->mtu = ETH_DATA_LEN;
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = IP_MAX_MTU;
+ dev->flags = IFF_NOARP;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = xfrmi_dev_free;
+ netif_keep_dst(dev);
+
+ eth_broadcast_addr(dev->broadcast);
+}
+
+#define XFRMI_FEATURES (NETIF_F_SG | \
+ NETIF_F_FRAGLIST | \
+ NETIF_F_GSO_SOFTWARE | \
+ NETIF_F_HW_CSUM)
+
+static int xfrmi_dev_init(struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link);
+ int err;
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ err = gro_cells_init(&xi->gro_cells, dev);
+ if (err) {
+ free_percpu(dev->tstats);
+ return err;
+ }
+
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= XFRMI_FEATURES;
+ dev->hw_features |= XFRMI_FEATURES;
+
+ if (phydev) {
+ dev->needed_headroom = phydev->needed_headroom;
+ dev->needed_tailroom = phydev->needed_tailroom;
+
+ if (is_zero_ether_addr(dev->dev_addr))
+ eth_hw_addr_inherit(dev, phydev);
+ if (is_zero_ether_addr(dev->broadcast))
+ memcpy(dev->broadcast, phydev->broadcast,
+ dev->addr_len);
+ } else {
+ eth_hw_addr_random(dev);
+ eth_broadcast_addr(dev->broadcast);
+ }
+
+ return 0;
+}
+
+static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ return 0;
+}
+
+static void xfrmi_netlink_parms(struct nlattr *data[],
+ struct xfrm_if_parms *parms)
+{
+ memset(parms, 0, sizeof(*parms));
+
+ if (!data)
+ return;
+
+ if (data[IFLA_XFRM_LINK])
+ parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
+
+ if (data[IFLA_XFRM_IF_ID])
+ parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
+
+ if (data[IFLA_XFRM_COLLECT_METADATA])
+ parms->collect_md = true;
+}
+
+static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = dev_net(dev);
+ struct xfrm_if_parms p = {};
+ struct xfrm_if *xi;
+ int err;
+
+ xfrmi_netlink_parms(data, &p);
+ if (p.collect_md) {
+ struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
+
+ if (p.link || p.if_id) {
+ NL_SET_ERR_MSG(extack, "link and if_id must be zero");
+ return -EINVAL;
+ }
+
+ if (rtnl_dereference(xfrmn->collect_md_xfrmi))
+ return -EEXIST;
+
+ } else {
+ if (!p.if_id) {
+ NL_SET_ERR_MSG(extack, "if_id must be non zero");
+ return -EINVAL;
+ }
+
+ xi = xfrmi_locate(net, &p);
+ if (xi)
+ return -EEXIST;
+ }
+
+ xi = netdev_priv(dev);
+ xi->p = p;
+ xi->net = net;
+ xi->dev = dev;
+
+ err = xfrmi_create(dev);
+ return err;
+}
+
+static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
+{
+ unregister_netdevice_queue(dev, head);
+}
+
+static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct net *net = xi->net;
+ struct xfrm_if_parms p = {};
+
+ xfrmi_netlink_parms(data, &p);
+ if (!p.if_id) {
+ NL_SET_ERR_MSG(extack, "if_id must be non zero");
+ return -EINVAL;
+ }
+
+ if (p.collect_md) {
+ NL_SET_ERR_MSG(extack, "collect_md can't be changed");
+ return -EINVAL;
+ }
+
+ xi = xfrmi_locate(net, &p);
+ if (!xi) {
+ xi = netdev_priv(dev);
+ } else {
+ if (xi->dev != dev)
+ return -EEXIST;
+ if (xi->p.collect_md) {
+ NL_SET_ERR_MSG(extack,
+ "device can't be changed to collect_md");
+ return -EINVAL;
+ }
+ }
+
+ return xfrmi_update(xi, &p);
+}
+
+static size_t xfrmi_get_size(const struct net_device *dev)
+{
+ return
+ /* IFLA_XFRM_LINK */
+ nla_total_size(4) +
+ /* IFLA_XFRM_IF_ID */
+ nla_total_size(4) +
+ /* IFLA_XFRM_COLLECT_METADATA */
+ nla_total_size(0) +
+ 0;
+}
+
+static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct xfrm_if_parms *parm = &xi->p;
+
+ if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
+ nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id) ||
+ (xi->p.collect_md && nla_put_flag(skb, IFLA_XFRM_COLLECT_METADATA)))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static struct net *xfrmi_get_link_net(const struct net_device *dev)
+{
+ struct xfrm_if *xi = netdev_priv(dev);
+
+ return xi->net;
+}
+
+static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
+ [IFLA_XFRM_UNSPEC] = { .strict_start_type = IFLA_XFRM_COLLECT_METADATA },
+ [IFLA_XFRM_LINK] = { .type = NLA_U32 },
+ [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
+ [IFLA_XFRM_COLLECT_METADATA] = { .type = NLA_FLAG },
+};
+
+static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
+ .kind = "xfrm",
+ .maxtype = IFLA_XFRM_MAX,
+ .policy = xfrmi_policy,
+ .priv_size = sizeof(struct xfrm_if),
+ .setup = xfrmi_dev_setup,
+ .validate = xfrmi_validate,
+ .newlink = xfrmi_newlink,
+ .dellink = xfrmi_dellink,
+ .changelink = xfrmi_changelink,
+ .get_size = xfrmi_get_size,
+ .fill_info = xfrmi_fill_info,
+ .get_link_net = xfrmi_get_link_net,
+};
+
+static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list)
+{
+ struct net *net;
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ list_for_each_entry(net, net_exit_list, exit_list) {
+ struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
+ struct xfrm_if __rcu **xip;
+ struct xfrm_if *xi;
+ int i;
+
+ for (i = 0; i < XFRMI_HASH_SIZE; i++) {
+ for (xip = &xfrmn->xfrmi[i];
+ (xi = rtnl_dereference(*xip)) != NULL;
+ xip = &xi->next)
+ unregister_netdevice_queue(xi->dev, &list);
+ }
+ xi = rtnl_dereference(xfrmn->collect_md_xfrmi);
+ if (xi)
+ unregister_netdevice_queue(xi->dev, &list);
+ }
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations xfrmi_net_ops = {
+ .exit_batch = xfrmi_exit_batch_net,
+ .id = &xfrmi_net_id,
+ .size = sizeof(struct xfrmi_net),
+};
+
+static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
+ .handler = xfrm6_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi6_err,
+ .priority = 10,
+};
+
+static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
+ .handler = xfrm6_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi6_err,
+ .priority = 10,
+};
+
+static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
+ .handler = xfrm6_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi6_err,
+ .priority = 10,
+};
+
+#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
+static int xfrmi6_rcv_tunnel(struct sk_buff *skb)
+{
+ const xfrm_address_t *saddr;
+ __be32 spi;
+
+ saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
+ spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
+
+ return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
+}
+
+static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = {
+ .handler = xfrmi6_rcv_tunnel,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi6_err,
+ .priority = 2,
+};
+
+static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = {
+ .handler = xfrmi6_rcv_tunnel,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi6_err,
+ .priority = 2,
+};
+#endif
+
+static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
+ .handler = xfrm4_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi4_err,
+ .priority = 10,
+};
+
+static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
+ .handler = xfrm4_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi4_err,
+ .priority = 10,
+};
+
+static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
+ .handler = xfrm4_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi4_err,
+ .priority = 10,
+};
+
+#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
+static int xfrmi4_rcv_tunnel(struct sk_buff *skb)
+{
+ return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
+}
+
+static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = {
+ .handler = xfrmi4_rcv_tunnel,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi4_err,
+ .priority = 3,
+};
+
+static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = {
+ .handler = xfrmi4_rcv_tunnel,
+ .cb_handler = xfrmi_rcv_cb,
+ .err_handler = xfrmi4_err,
+ .priority = 2,
+};
+#endif
+
+static int __init xfrmi4_init(void)
+{
+ int err;
+
+ err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
+ if (err < 0)
+ goto xfrm_proto_esp_failed;
+ err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
+ if (err < 0)
+ goto xfrm_proto_ah_failed;
+ err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
+ if (err < 0)
+ goto xfrm_proto_comp_failed;
+#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
+ err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET);
+ if (err < 0)
+ goto xfrm_tunnel_ipip_failed;
+ err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6);
+ if (err < 0)
+ goto xfrm_tunnel_ipip6_failed;
+#endif
+
+ return 0;
+
+#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
+xfrm_tunnel_ipip6_failed:
+ xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
+xfrm_tunnel_ipip_failed:
+ xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
+#endif
+xfrm_proto_comp_failed:
+ xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
+xfrm_proto_ah_failed:
+ xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
+xfrm_proto_esp_failed:
+ return err;
+}
+
+static void xfrmi4_fini(void)
+{
+#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
+ xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6);
+ xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
+#endif
+ xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
+ xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
+ xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
+}
+
+static int __init xfrmi6_init(void)
+{
+ int err;
+
+ err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
+ if (err < 0)
+ goto xfrm_proto_esp_failed;
+ err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
+ if (err < 0)
+ goto xfrm_proto_ah_failed;
+ err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
+ if (err < 0)
+ goto xfrm_proto_comp_failed;
+#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
+ err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6);
+ if (err < 0)
+ goto xfrm_tunnel_ipv6_failed;
+ err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET);
+ if (err < 0)
+ goto xfrm_tunnel_ip6ip_failed;
+#endif
+
+ return 0;
+
+#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
+xfrm_tunnel_ip6ip_failed:
+ xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
+xfrm_tunnel_ipv6_failed:
+ xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
+#endif
+xfrm_proto_comp_failed:
+ xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
+xfrm_proto_ah_failed:
+ xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
+xfrm_proto_esp_failed:
+ return err;
+}
+
+static void xfrmi6_fini(void)
+{
+#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
+ xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET);
+ xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
+#endif
+ xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
+ xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
+ xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
+}
+
+static const struct xfrm_if_cb xfrm_if_cb = {
+ .decode_session = xfrmi_decode_session,
+};
+
+static int __init xfrmi_init(void)
+{
+ const char *msg;
+ int err;
+
+ pr_info("IPsec XFRM device driver\n");
+
+ msg = "tunnel device";
+ err = register_pernet_device(&xfrmi_net_ops);
+ if (err < 0)
+ goto pernet_dev_failed;
+
+ msg = "xfrm4 protocols";
+ err = xfrmi4_init();
+ if (err < 0)
+ goto xfrmi4_failed;
+
+ msg = "xfrm6 protocols";
+ err = xfrmi6_init();
+ if (err < 0)
+ goto xfrmi6_failed;
+
+
+ msg = "netlink interface";
+ err = rtnl_link_register(&xfrmi_link_ops);
+ if (err < 0)
+ goto rtnl_link_failed;
+
+ lwtunnel_encap_add_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM);
+
+ xfrm_if_register_cb(&xfrm_if_cb);
+
+ return err;
+
+rtnl_link_failed:
+ xfrmi6_fini();
+xfrmi6_failed:
+ xfrmi4_fini();
+xfrmi4_failed:
+ unregister_pernet_device(&xfrmi_net_ops);
+pernet_dev_failed:
+ pr_err("xfrmi init: failed to register %s\n", msg);
+ return err;
+}
+
+static void __exit xfrmi_fini(void)
+{
+ xfrm_if_unregister_cb();
+ lwtunnel_encap_del_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM);
+ rtnl_link_unregister(&xfrmi_link_ops);
+ xfrmi4_fini();
+ xfrmi6_fini();
+ unregister_pernet_device(&xfrmi_net_ops);
+}
+
+module_init(xfrmi_init);
+module_exit(xfrmi_fini);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("xfrm");
+MODULE_ALIAS_NETDEV("xfrm0");
+MODULE_AUTHOR("Steffen Klassert");
+MODULE_DESCRIPTION("XFRM virtual interface");
projects / linux-block.git / commitdiff