1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 virtual tunneling interface
5 * Copyright (C) 2013 secunet Security Networks AG
8 * Steffen Klassert <steffen.klassert@secunet.com>
11 * net/ipv6/ip6_tunnel.c
14 #include <linux/module.h>
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/types.h>
18 #include <linux/sockios.h>
19 #include <linux/icmp.h>
23 #include <linux/net.h>
24 #include <linux/in6.h>
25 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <linux/icmpv6.h>
28 #include <linux/init.h>
29 #include <linux/route.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/netfilter_ipv6.h>
32 #include <linux/slab.h>
33 #include <linux/hash.h>
35 #include <linux/uaccess.h>
36 #include <linux/atomic.h>
40 #include <net/ip_tunnels.h>
42 #include <net/ip6_route.h>
43 #include <net/addrconf.h>
44 #include <net/ip6_tunnel.h>
46 #include <net/net_namespace.h>
47 #include <net/netns/generic.h>
48 #include <linux/etherdevice.h>
50 #define IP6_VTI_HASH_SIZE_SHIFT 5
51 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
53 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
55 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
57 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
60 static int vti6_dev_init(struct net_device *dev);
61 static void vti6_dev_setup(struct net_device *dev);
62 static struct rtnl_link_ops vti6_link_ops __read_mostly;
64 static unsigned int vti6_net_id __read_mostly;
66 /* the vti6 tunnel fallback device */
67 struct net_device *fb_tnl_dev;
68 /* lists for storing tunnels in use */
69 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
70 struct ip6_tnl __rcu *tnls_wc[1];
71 struct ip6_tnl __rcu **tnls[2];
74 #define for_each_vti6_tunnel_rcu(start) \
75 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
78 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
79 * @net: network namespace
80 * @remote: the address of the tunnel exit-point
81 * @local: the address of the tunnel entry-point
84 * tunnel matching given end-points if found,
85 * else fallback tunnel if its device is up,
88 static struct ip6_tnl *
89 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
90 const struct in6_addr *local)
92 unsigned int hash = HASH(remote, local);
94 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
97 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
98 if (ipv6_addr_equal(local, &t->parms.laddr) &&
99 ipv6_addr_equal(remote, &t->parms.raddr) &&
100 (t->dev->flags & IFF_UP))
104 memset(&any, 0, sizeof(any));
105 hash = HASH(&any, local);
106 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
107 if (ipv6_addr_equal(local, &t->parms.laddr) &&
108 (t->dev->flags & IFF_UP))
112 hash = HASH(remote, &any);
113 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
114 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
115 (t->dev->flags & IFF_UP))
119 t = rcu_dereference(ip6n->tnls_wc[0]);
120 if (t && (t->dev->flags & IFF_UP))
127 * vti6_tnl_bucket - get head of list matching given tunnel parameters
128 * @p: parameters containing tunnel end-points
131 * vti6_tnl_bucket() returns the head of the list matching the
132 * &struct in6_addr entries laddr and raddr in @p.
134 * Return: head of IPv6 tunnel list
136 static struct ip6_tnl __rcu **
137 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
139 const struct in6_addr *remote = &p->raddr;
140 const struct in6_addr *local = &p->laddr;
144 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
146 h = HASH(remote, local);
148 return &ip6n->tnls[prio][h];
152 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
154 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
156 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
157 rcu_assign_pointer(*tp, t);
161 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
163 struct ip6_tnl __rcu **tp;
164 struct ip6_tnl *iter;
166 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
167 (iter = rtnl_dereference(*tp)) != NULL;
170 rcu_assign_pointer(*tp, t->next);
176 static void vti6_dev_free(struct net_device *dev)
178 free_percpu(dev->tstats);
181 static int vti6_tnl_create2(struct net_device *dev)
183 struct ip6_tnl *t = netdev_priv(dev);
184 struct net *net = dev_net(dev);
185 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
188 dev->rtnl_link_ops = &vti6_link_ops;
189 err = register_netdevice(dev);
193 strcpy(t->parms.name, dev->name);
196 vti6_tnl_link(ip6n, t);
204 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
206 struct net_device *dev;
212 if (!dev_valid_name(p->name))
214 strlcpy(name, p->name, IFNAMSIZ);
216 sprintf(name, "ip6_vti%%d");
219 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
223 dev_net_set(dev, net);
225 t = netdev_priv(dev);
227 t->net = dev_net(dev);
229 err = vti6_tnl_create2(dev);
242 * vti6_locate - find or create tunnel matching given parameters
243 * @net: network namespace
244 * @p: tunnel parameters
245 * @create: != 0 if allowed to create new tunnel if no match found
248 * vti6_locate() first tries to locate an existing tunnel
249 * based on @parms. If this is unsuccessful, but @create is set a new
250 * tunnel device is created and registered for use.
253 * matching tunnel or NULL
255 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
258 const struct in6_addr *remote = &p->raddr;
259 const struct in6_addr *local = &p->laddr;
260 struct ip6_tnl __rcu **tp;
262 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
264 for (tp = vti6_tnl_bucket(ip6n, p);
265 (t = rtnl_dereference(*tp)) != NULL;
267 if (ipv6_addr_equal(local, &t->parms.laddr) &&
268 ipv6_addr_equal(remote, &t->parms.raddr)) {
277 return vti6_tnl_create(net, p);
281 * vti6_dev_uninit - tunnel device uninitializer
282 * @dev: the device to be destroyed
285 * vti6_dev_uninit() removes tunnel from its list
287 static void vti6_dev_uninit(struct net_device *dev)
289 struct ip6_tnl *t = netdev_priv(dev);
290 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
292 if (dev == ip6n->fb_tnl_dev)
293 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
295 vti6_tnl_unlink(ip6n, t);
299 static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
306 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
308 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
313 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
318 ipv6h = ipv6_hdr(skb);
319 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
320 t->dev->stats.rx_dropped++;
327 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
328 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
329 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
330 return xfrm_input(skb, nexthdr, spi, encap_type);
339 static int vti6_rcv(struct sk_buff *skb)
341 int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
343 return vti6_input_proto(skb, nexthdr, 0, 0);
346 static int vti6_rcv_cb(struct sk_buff *skb, int err)
348 unsigned short family;
349 struct net_device *dev;
350 struct pcpu_sw_netstats *tstats;
351 struct xfrm_state *x;
352 const struct xfrm_mode *inner_mode;
353 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
354 u32 orig_mark = skb->mark;
363 dev->stats.rx_errors++;
364 dev->stats.rx_dropped++;
369 x = xfrm_input_state(skb);
371 inner_mode = &x->inner_mode;
373 if (x->sel.family == AF_UNSPEC) {
374 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
375 if (inner_mode == NULL) {
376 XFRM_INC_STATS(dev_net(skb->dev),
377 LINUX_MIB_XFRMINSTATEMODEERROR);
382 family = inner_mode->family;
384 skb->mark = be32_to_cpu(t->parms.i_key);
385 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
386 skb->mark = orig_mark;
391 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
394 tstats = this_cpu_ptr(dev->tstats);
395 u64_stats_update_begin(&tstats->syncp);
396 tstats->rx_packets++;
397 tstats->rx_bytes += skb->len;
398 u64_stats_update_end(&tstats->syncp);
404 * vti6_addr_conflict - compare packet addresses to tunnel's own
405 * @t: the outgoing tunnel device
406 * @hdr: IPv6 header from the incoming packet
409 * Avoid trivial tunneling loop by checking that tunnel exit-point
410 * doesn't match source of incoming packet.
417 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
419 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
422 static bool vti6_state_check(const struct xfrm_state *x,
423 const struct in6_addr *dst,
424 const struct in6_addr *src)
426 xfrm_address_t *daddr = (xfrm_address_t *)dst;
427 xfrm_address_t *saddr = (xfrm_address_t *)src;
429 /* if there is no transform then this tunnel is not functional.
430 * Or if the xfrm is not mode tunnel.
432 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
433 x->props.family != AF_INET6)
436 if (ipv6_addr_any(dst))
437 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
439 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
446 * vti6_xmit - send a packet
447 * @skb: the outgoing socket buffer
448 * @dev: the outgoing tunnel device
449 * @fl: the flow informations for the xfrm_lookup
452 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
454 struct ip6_tnl *t = netdev_priv(dev);
455 struct net_device_stats *stats = &t->dev->stats;
456 struct dst_entry *dst = skb_dst(skb);
457 struct net_device *tdev;
458 struct xfrm_state *x;
459 int pkt_len = skb->len;
464 switch (skb->protocol) {
465 case htons(ETH_P_IP): {
468 fl->u.ip4.flowi4_oif = dev->ifindex;
469 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
470 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
472 goto tx_err_link_failure;
474 skb_dst_set(skb, dst);
477 case htons(ETH_P_IPV6):
478 fl->u.ip6.flowi6_oif = dev->ifindex;
479 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
480 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
484 goto tx_err_link_failure;
486 skb_dst_set(skb, dst);
489 goto tx_err_link_failure;
494 dst = xfrm_lookup_route(t->net, dst, fl, NULL, 0);
498 goto tx_err_link_failure;
501 if (dst->flags & DST_XFRM_QUEUE)
505 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
506 goto tx_err_link_failure;
508 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
509 (const struct in6_addr *)&x->id.daddr))
510 goto tx_err_link_failure;
516 net_warn_ratelimited("%s: Local routing loop detected!\n",
518 goto tx_err_dst_release;
522 if (skb->len > mtu) {
523 skb_dst_update_pmtu_no_confirm(skb, mtu);
525 if (skb->protocol == htons(ETH_P_IPV6)) {
526 if (mtu < IPV6_MIN_MTU)
529 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
531 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
536 goto tx_err_dst_release;
540 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
541 skb_dst_set(skb, dst);
542 skb->dev = skb_dst(skb)->dev;
544 err = dst_output(t->net, skb->sk, skb);
545 if (net_xmit_eval(err) == 0)
547 iptunnel_xmit_stats(dev, err);
551 stats->tx_carrier_errors++;
552 dst_link_failure(skb);
559 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
561 struct ip6_tnl *t = netdev_priv(dev);
562 struct net_device_stats *stats = &t->dev->stats;
566 if (!pskb_inet_may_pull(skb))
569 memset(&fl, 0, sizeof(fl));
571 switch (skb->protocol) {
572 case htons(ETH_P_IPV6):
573 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
574 vti6_addr_conflict(t, ipv6_hdr(skb)))
577 xfrm_decode_session(skb, &fl, AF_INET6);
578 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
580 case htons(ETH_P_IP):
581 xfrm_decode_session(skb, &fl, AF_INET);
582 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
588 /* override mark with tunnel output key */
589 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
591 ret = vti6_xmit(skb, dev, &fl);
604 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
605 u8 type, u8 code, int offset, __be32 info)
609 struct xfrm_state *x;
611 struct ip_esp_hdr *esph;
612 struct ip_auth_hdr *ah;
613 struct ip_comp_hdr *ipch;
614 struct net *net = dev_net(skb->dev);
615 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
616 int protocol = iph->nexthdr;
618 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
622 mark = be32_to_cpu(t->parms.o_key);
626 esph = (struct ip_esp_hdr *)(skb->data + offset);
630 ah = (struct ip_auth_hdr *)(skb->data + offset);
634 ipch = (struct ip_comp_hdr *)(skb->data + offset);
635 spi = htonl(ntohs(ipch->cpi));
641 if (type != ICMPV6_PKT_TOOBIG &&
642 type != NDISC_REDIRECT)
645 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
646 spi, protocol, AF_INET6);
650 if (type == NDISC_REDIRECT)
651 ip6_redirect(skb, net, skb->dev->ifindex, 0,
652 sock_net_uid(net, NULL));
654 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
660 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
662 struct net_device *dev = t->dev;
663 struct __ip6_tnl_parm *p = &t->parms;
664 struct net_device *tdev = NULL;
667 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
668 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
670 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
671 IP6_TNL_F_CAP_PER_PACKET);
672 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
674 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
675 dev->flags |= IFF_POINTOPOINT;
677 dev->flags &= ~IFF_POINTOPOINT;
679 if (keep_mtu && dev->mtu) {
680 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
684 if (p->flags & IP6_TNL_F_CAP_XMIT) {
685 int strict = (ipv6_addr_type(&p->raddr) &
686 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
687 struct rt6_info *rt = rt6_lookup(t->net,
688 &p->raddr, &p->laddr,
689 p->link, NULL, strict);
696 if (!tdev && p->link)
697 tdev = __dev_get_by_index(t->net, p->link);
700 mtu = tdev->mtu - sizeof(struct ipv6hdr);
702 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
704 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
708 * vti6_tnl_change - update the tunnel parameters
709 * @t: tunnel to be changed
710 * @p: tunnel configuration parameters
711 * @keep_mtu: MTU was set from userspace, don't re-compute it
714 * vti6_tnl_change() updates the tunnel parameters
717 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
720 t->parms.laddr = p->laddr;
721 t->parms.raddr = p->raddr;
722 t->parms.link = p->link;
723 t->parms.i_key = p->i_key;
724 t->parms.o_key = p->o_key;
725 t->parms.proto = p->proto;
726 t->parms.fwmark = p->fwmark;
727 dst_cache_reset(&t->dst_cache);
728 vti6_link_config(t, keep_mtu);
732 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
735 struct net *net = dev_net(t->dev);
736 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
739 vti6_tnl_unlink(ip6n, t);
741 err = vti6_tnl_change(t, p, keep_mtu);
742 vti6_tnl_link(ip6n, t);
743 netdev_state_change(t->dev);
748 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
757 memcpy(p->name, u->name, sizeof(u->name));
761 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
769 u->i_flags |= GRE_KEY;
771 u->o_flags |= GRE_KEY;
774 memcpy(u->name, p->name, sizeof(u->name));
778 * vti6_ioctl - configure vti6 tunnels from userspace
779 * @dev: virtual device associated with tunnel
780 * @ifr: parameters passed from userspace
781 * @cmd: command to be performed
784 * vti6_ioctl() is used for managing vti6 tunnels
787 * The possible commands are the following:
788 * %SIOCGETTUNNEL: get tunnel parameters for device
789 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
790 * %SIOCCHGTUNNEL: change tunnel parameters to those given
791 * %SIOCDELTUNNEL: delete tunnel
793 * The fallback device "ip6_vti0", created during module
794 * initialization, can be used for creating other tunnel devices.
798 * %-EFAULT if unable to copy data to or from userspace,
799 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
800 * %-EINVAL if passed tunnel parameters are invalid,
801 * %-EEXIST if changing a tunnel's parameters would cause a conflict
802 * %-ENODEV if attempting to change or delete a nonexisting device
805 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
808 struct ip6_tnl_parm2 p;
809 struct __ip6_tnl_parm p1;
810 struct ip6_tnl *t = NULL;
811 struct net *net = dev_net(dev);
812 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
816 if (dev == ip6n->fb_tnl_dev) {
817 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
821 vti6_parm_from_user(&p1, &p);
822 t = vti6_locate(net, &p1, 0);
824 memset(&p, 0, sizeof(p));
827 t = netdev_priv(dev);
828 vti6_parm_to_user(&p, &t->parms);
829 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
835 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
838 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
841 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
843 vti6_parm_from_user(&p1, &p);
844 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
845 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
852 t = netdev_priv(dev);
854 err = vti6_update(t, &p1, false);
858 vti6_parm_to_user(&p, &t->parms);
859 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
863 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
867 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
870 if (dev == ip6n->fb_tnl_dev) {
872 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
875 vti6_parm_from_user(&p1, &p);
876 t = vti6_locate(net, &p1, 0);
880 if (t->dev == ip6n->fb_tnl_dev)
885 unregister_netdevice(dev);
893 static const struct net_device_ops vti6_netdev_ops = {
894 .ndo_init = vti6_dev_init,
895 .ndo_uninit = vti6_dev_uninit,
896 .ndo_start_xmit = vti6_tnl_xmit,
897 .ndo_do_ioctl = vti6_ioctl,
898 .ndo_get_stats64 = ip_tunnel_get_stats64,
899 .ndo_get_iflink = ip6_tnl_get_iflink,
903 * vti6_dev_setup - setup virtual tunnel device
904 * @dev: virtual device associated with tunnel
907 * Initialize function pointers and device parameters
909 static void vti6_dev_setup(struct net_device *dev)
911 dev->netdev_ops = &vti6_netdev_ops;
912 dev->header_ops = &ip_tunnel_header_ops;
913 dev->needs_free_netdev = true;
914 dev->priv_destructor = vti6_dev_free;
916 dev->type = ARPHRD_TUNNEL6;
917 dev->min_mtu = IPV4_MIN_MTU;
918 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
919 dev->flags |= IFF_NOARP;
920 dev->addr_len = sizeof(struct in6_addr);
922 /* This perm addr will be used as interface identifier by IPv6 */
923 dev->addr_assign_type = NET_ADDR_RANDOM;
924 eth_random_addr(dev->perm_addr);
928 * vti6_dev_init_gen - general initializer for all tunnel devices
929 * @dev: virtual device associated with tunnel
931 static inline int vti6_dev_init_gen(struct net_device *dev)
933 struct ip6_tnl *t = netdev_priv(dev);
936 t->net = dev_net(dev);
937 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
944 * vti6_dev_init - initializer for all non fallback tunnel devices
945 * @dev: virtual device associated with tunnel
947 static int vti6_dev_init(struct net_device *dev)
949 struct ip6_tnl *t = netdev_priv(dev);
950 int err = vti6_dev_init_gen(dev);
954 vti6_link_config(t, true);
959 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
960 * @dev: fallback device
964 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
966 struct ip6_tnl *t = netdev_priv(dev);
967 struct net *net = dev_net(dev);
968 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
970 t->parms.proto = IPPROTO_IPV6;
973 rcu_assign_pointer(ip6n->tnls_wc[0], t);
977 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
978 struct netlink_ext_ack *extack)
983 static void vti6_netlink_parms(struct nlattr *data[],
984 struct __ip6_tnl_parm *parms)
986 memset(parms, 0, sizeof(*parms));
991 if (data[IFLA_VTI_LINK])
992 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
994 if (data[IFLA_VTI_LOCAL])
995 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
997 if (data[IFLA_VTI_REMOTE])
998 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
1000 if (data[IFLA_VTI_IKEY])
1001 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
1003 if (data[IFLA_VTI_OKEY])
1004 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
1006 if (data[IFLA_VTI_FWMARK])
1007 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1010 static int vti6_newlink(struct net *src_net, struct net_device *dev,
1011 struct nlattr *tb[], struct nlattr *data[],
1012 struct netlink_ext_ack *extack)
1014 struct net *net = dev_net(dev);
1017 nt = netdev_priv(dev);
1018 vti6_netlink_parms(data, &nt->parms);
1020 nt->parms.proto = IPPROTO_IPV6;
1022 if (vti6_locate(net, &nt->parms, 0))
1025 return vti6_tnl_create2(dev);
1028 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1030 struct net *net = dev_net(dev);
1031 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1033 if (dev != ip6n->fb_tnl_dev)
1034 unregister_netdevice_queue(dev, head);
1037 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1038 struct nlattr *data[],
1039 struct netlink_ext_ack *extack)
1042 struct __ip6_tnl_parm p;
1043 struct net *net = dev_net(dev);
1044 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1046 if (dev == ip6n->fb_tnl_dev)
1049 vti6_netlink_parms(data, &p);
1051 t = vti6_locate(net, &p, 0);
1057 t = netdev_priv(dev);
1059 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1062 static size_t vti6_get_size(const struct net_device *dev)
1067 /* IFLA_VTI_LOCAL */
1068 nla_total_size(sizeof(struct in6_addr)) +
1069 /* IFLA_VTI_REMOTE */
1070 nla_total_size(sizeof(struct in6_addr)) +
1075 /* IFLA_VTI_FWMARK */
1080 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1082 struct ip6_tnl *tunnel = netdev_priv(dev);
1083 struct __ip6_tnl_parm *parm = &tunnel->parms;
1085 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1086 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1087 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1088 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1089 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1090 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1091 goto nla_put_failure;
1098 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1099 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1100 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1101 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1102 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1103 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1104 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1107 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1109 .maxtype = IFLA_VTI_MAX,
1110 .policy = vti6_policy,
1111 .priv_size = sizeof(struct ip6_tnl),
1112 .setup = vti6_dev_setup,
1113 .validate = vti6_validate,
1114 .newlink = vti6_newlink,
1115 .dellink = vti6_dellink,
1116 .changelink = vti6_changelink,
1117 .get_size = vti6_get_size,
1118 .fill_info = vti6_fill_info,
1119 .get_link_net = ip6_tnl_get_link_net,
1122 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1123 struct list_head *list)
1128 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1129 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1131 unregister_netdevice_queue(t->dev, list);
1132 t = rtnl_dereference(t->next);
1136 t = rtnl_dereference(ip6n->tnls_wc[0]);
1138 unregister_netdevice_queue(t->dev, list);
1141 static int __net_init vti6_init_net(struct net *net)
1143 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1144 struct ip6_tnl *t = NULL;
1147 ip6n->tnls[0] = ip6n->tnls_wc;
1148 ip6n->tnls[1] = ip6n->tnls_r_l;
1150 if (!net_has_fallback_tunnels(net))
1153 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1154 NET_NAME_UNKNOWN, vti6_dev_setup);
1156 if (!ip6n->fb_tnl_dev)
1158 dev_net_set(ip6n->fb_tnl_dev, net);
1159 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1161 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1165 err = register_netdev(ip6n->fb_tnl_dev);
1169 t = netdev_priv(ip6n->fb_tnl_dev);
1171 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1175 free_netdev(ip6n->fb_tnl_dev);
1180 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1182 struct vti6_net *ip6n;
1187 list_for_each_entry(net, net_list, exit_list) {
1188 ip6n = net_generic(net, vti6_net_id);
1189 vti6_destroy_tunnels(ip6n, &list);
1191 unregister_netdevice_many(&list);
1195 static struct pernet_operations vti6_net_ops = {
1196 .init = vti6_init_net,
1197 .exit_batch = vti6_exit_batch_net,
1199 .size = sizeof(struct vti6_net),
1202 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1203 .handler = vti6_rcv,
1204 .input_handler = vti6_input_proto,
1205 .cb_handler = vti6_rcv_cb,
1206 .err_handler = vti6_err,
1210 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1211 .handler = vti6_rcv,
1212 .input_handler = vti6_input_proto,
1213 .cb_handler = vti6_rcv_cb,
1214 .err_handler = vti6_err,
1218 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1219 .handler = vti6_rcv,
1220 .input_handler = vti6_input_proto,
1221 .cb_handler = vti6_rcv_cb,
1222 .err_handler = vti6_err,
1226 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1227 static int vti6_rcv_tunnel(struct sk_buff *skb)
1229 const xfrm_address_t *saddr;
1232 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1233 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1235 return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0);
1238 static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = {
1239 .handler = vti6_rcv_tunnel,
1240 .cb_handler = vti6_rcv_cb,
1241 .err_handler = vti6_err,
1245 static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
1246 .handler = vti6_rcv_tunnel,
1247 .cb_handler = vti6_rcv_cb,
1248 .err_handler = vti6_err,
1254 * vti6_tunnel_init - register protocol and reserve needed resources
1256 * Return: 0 on success
1258 static int __init vti6_tunnel_init(void)
1263 msg = "tunnel device";
1264 err = register_pernet_device(&vti6_net_ops);
1266 goto pernet_dev_failed;
1268 msg = "tunnel protocols";
1269 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1271 goto xfrm_proto_esp_failed;
1272 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1274 goto xfrm_proto_ah_failed;
1275 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1277 goto xfrm_proto_comp_failed;
1278 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1279 msg = "ipv6 tunnel";
1280 err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
1282 goto vti_tunnel_ipv6_failed;
1283 err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
1285 goto vti_tunnel_ip6ip_failed;
1288 msg = "netlink interface";
1289 err = rtnl_link_register(&vti6_link_ops);
1291 goto rtnl_link_failed;
1296 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1297 err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1298 vti_tunnel_ip6ip_failed:
1299 err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1300 vti_tunnel_ipv6_failed:
1302 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1303 xfrm_proto_comp_failed:
1304 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1305 xfrm_proto_ah_failed:
1306 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1307 xfrm_proto_esp_failed:
1308 unregister_pernet_device(&vti6_net_ops);
1310 pr_err("vti6 init: failed to register %s\n", msg);
1315 * vti6_tunnel_cleanup - free resources and unregister protocol
1317 static void __exit vti6_tunnel_cleanup(void)
1319 rtnl_link_unregister(&vti6_link_ops);
1320 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1321 xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1322 xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1324 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1325 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1326 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1327 unregister_pernet_device(&vti6_net_ops);
1330 module_init(vti6_tunnel_init);
1331 module_exit(vti6_tunnel_cleanup);
1332 MODULE_LICENSE("GPL");
1333 MODULE_ALIAS_RTNL_LINK("vti6");
1334 MODULE_ALIAS_NETDEV("ip6_vti0");
1335 MODULE_AUTHOR("Steffen Klassert");
1336 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");