2 * Copyright (c) 2013 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/capability.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/uaccess.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
30 #include <linux/tcp.h>
31 #include <linux/udp.h>
32 #include <linux/if_arp.h>
33 #include <linux/mroute.h>
34 #include <linux/init.h>
35 #include <linux/in6.h>
36 #include <linux/inetdevice.h>
37 #include <linux/igmp.h>
38 #include <linux/netfilter_ipv4.h>
39 #include <linux/etherdevice.h>
40 #include <linux/if_ether.h>
41 #include <linux/if_vlan.h>
42 #include <linux/rculist.h>
43 #include <linux/err.h>
48 #include <net/protocol.h>
49 #include <net/ip_tunnels.h>
51 #include <net/checksum.h>
52 #include <net/dsfield.h>
53 #include <net/inet_ecn.h>
55 #include <net/net_namespace.h>
56 #include <net/netns/generic.h>
57 #include <net/rtnetlink.h>
59 #if IS_ENABLED(CONFIG_IPV6)
61 #include <net/ip6_fib.h>
62 #include <net/ip6_route.h>
65 static unsigned int ip_tunnel_hash(__be32 key, __be32 remote)
67 return hash_32((__force u32)key ^ (__force u32)remote,
71 static void __tunnel_dst_set(struct ip_tunnel_dst *idst,
72 struct dst_entry *dst)
74 struct dst_entry *old_dst;
77 if (dst->flags & DST_NOCACHE)
82 old_dst = xchg((__force struct dst_entry **)&idst->dst, dst);
86 static void tunnel_dst_set(struct ip_tunnel *t, struct dst_entry *dst)
88 __tunnel_dst_set(this_cpu_ptr(t->dst_cache), dst);
91 static void tunnel_dst_reset(struct ip_tunnel *t)
93 tunnel_dst_set(t, NULL);
96 void ip_tunnel_dst_reset_all(struct ip_tunnel *t)
100 for_each_possible_cpu(i)
101 __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL);
103 EXPORT_SYMBOL(ip_tunnel_dst_reset_all);
105 static struct rtable *tunnel_rtable_get(struct ip_tunnel *t, u32 cookie)
107 struct dst_entry *dst;
110 dst = rcu_dereference(this_cpu_ptr(t->dst_cache)->dst);
112 if (dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
120 return (struct rtable *)dst;
123 static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
124 __be16 flags, __be32 key)
126 if (p->i_flags & TUNNEL_KEY) {
127 if (flags & TUNNEL_KEY)
128 return key == p->i_key;
130 /* key expected, none present */
133 return !(flags & TUNNEL_KEY);
136 /* Fallback tunnel: no source, no destination, no key, no options
139 We require exact key match i.e. if a key is present in packet
140 it will match only tunnel with the same key; if it is not present,
141 it will match only keyless tunnel.
143 All keysless packets, if not matched configured keyless tunnels
144 will match fallback tunnel.
145 Given src, dst and key, find appropriate for input tunnel.
147 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
148 int link, __be16 flags,
149 __be32 remote, __be32 local,
153 struct ip_tunnel *t, *cand = NULL;
154 struct hlist_head *head;
156 hash = ip_tunnel_hash(key, remote);
157 head = &itn->tunnels[hash];
159 hlist_for_each_entry_rcu(t, head, hash_node) {
160 if (local != t->parms.iph.saddr ||
161 remote != t->parms.iph.daddr ||
162 !(t->dev->flags & IFF_UP))
165 if (!ip_tunnel_key_match(&t->parms, flags, key))
168 if (t->parms.link == link)
174 hlist_for_each_entry_rcu(t, head, hash_node) {
175 if (remote != t->parms.iph.daddr ||
176 !(t->dev->flags & IFF_UP))
179 if (!ip_tunnel_key_match(&t->parms, flags, key))
182 if (t->parms.link == link)
188 hash = ip_tunnel_hash(key, 0);
189 head = &itn->tunnels[hash];
191 hlist_for_each_entry_rcu(t, head, hash_node) {
192 if ((local != t->parms.iph.saddr &&
193 (local != t->parms.iph.daddr ||
194 !ipv4_is_multicast(local))) ||
195 !(t->dev->flags & IFF_UP))
198 if (!ip_tunnel_key_match(&t->parms, flags, key))
201 if (t->parms.link == link)
207 if (flags & TUNNEL_NO_KEY)
208 goto skip_key_lookup;
210 hlist_for_each_entry_rcu(t, head, hash_node) {
211 if (t->parms.i_key != key ||
212 !(t->dev->flags & IFF_UP))
215 if (t->parms.link == link)
225 if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
226 return netdev_priv(itn->fb_tunnel_dev);
231 EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
233 static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
234 struct ip_tunnel_parm *parms)
238 __be32 i_key = parms->i_key;
240 if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
241 remote = parms->iph.daddr;
245 if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI))
248 h = ip_tunnel_hash(i_key, remote);
249 return &itn->tunnels[h];
252 static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
254 struct hlist_head *head = ip_bucket(itn, &t->parms);
256 hlist_add_head_rcu(&t->hash_node, head);
259 static void ip_tunnel_del(struct ip_tunnel *t)
261 hlist_del_init_rcu(&t->hash_node);
264 static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
265 struct ip_tunnel_parm *parms,
268 __be32 remote = parms->iph.daddr;
269 __be32 local = parms->iph.saddr;
270 __be32 key = parms->i_key;
271 int link = parms->link;
272 struct ip_tunnel *t = NULL;
273 struct hlist_head *head = ip_bucket(itn, parms);
275 hlist_for_each_entry_rcu(t, head, hash_node) {
276 if (local == t->parms.iph.saddr &&
277 remote == t->parms.iph.daddr &&
278 key == t->parms.i_key &&
279 link == t->parms.link &&
280 type == t->dev->type)
286 static struct net_device *__ip_tunnel_create(struct net *net,
287 const struct rtnl_link_ops *ops,
288 struct ip_tunnel_parm *parms)
291 struct ip_tunnel *tunnel;
292 struct net_device *dev;
296 strlcpy(name, parms->name, IFNAMSIZ);
298 if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
302 strlcpy(name, ops->kind, IFNAMSIZ);
303 strncat(name, "%d", 2);
307 dev = alloc_netdev(ops->priv_size, name, ops->setup);
312 dev_net_set(dev, net);
314 dev->rtnl_link_ops = ops;
316 tunnel = netdev_priv(dev);
317 tunnel->parms = *parms;
320 err = register_netdevice(dev);
332 static inline void init_tunnel_flow(struct flowi4 *fl4,
334 __be32 daddr, __be32 saddr,
335 __be32 key, __u8 tos, int oif)
337 memset(fl4, 0, sizeof(*fl4));
338 fl4->flowi4_oif = oif;
341 fl4->flowi4_tos = tos;
342 fl4->flowi4_proto = proto;
343 fl4->fl4_gre_key = key;
346 static int ip_tunnel_bind_dev(struct net_device *dev)
348 struct net_device *tdev = NULL;
349 struct ip_tunnel *tunnel = netdev_priv(dev);
350 const struct iphdr *iph;
351 int hlen = LL_MAX_HEADER;
352 int mtu = ETH_DATA_LEN;
353 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
355 iph = &tunnel->parms.iph;
357 /* Guess output device to choose reasonable mtu and needed_headroom */
362 init_tunnel_flow(&fl4, iph->protocol, iph->daddr,
363 iph->saddr, tunnel->parms.o_key,
364 RT_TOS(iph->tos), tunnel->parms.link);
365 rt = ip_route_output_key(tunnel->net, &fl4);
369 tunnel_dst_set(tunnel, &rt->dst);
372 if (dev->type != ARPHRD_ETHER)
373 dev->flags |= IFF_POINTOPOINT;
376 if (!tdev && tunnel->parms.link)
377 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
380 hlen = tdev->hard_header_len + tdev->needed_headroom;
383 dev->iflink = tunnel->parms.link;
385 dev->needed_headroom = t_hlen + hlen;
386 mtu -= (dev->hard_header_len + t_hlen);
394 static struct ip_tunnel *ip_tunnel_create(struct net *net,
395 struct ip_tunnel_net *itn,
396 struct ip_tunnel_parm *parms)
398 struct ip_tunnel *nt, *fbt;
399 struct net_device *dev;
401 BUG_ON(!itn->fb_tunnel_dev);
402 fbt = netdev_priv(itn->fb_tunnel_dev);
403 dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
405 return ERR_CAST(dev);
407 dev->mtu = ip_tunnel_bind_dev(dev);
409 nt = netdev_priv(dev);
410 ip_tunnel_add(itn, nt);
414 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
415 const struct tnl_ptk_info *tpi, bool log_ecn_error)
417 struct pcpu_sw_netstats *tstats;
418 const struct iphdr *iph = ip_hdr(skb);
421 #ifdef CONFIG_NET_IPGRE_BROADCAST
422 if (ipv4_is_multicast(iph->daddr)) {
423 tunnel->dev->stats.multicast++;
424 skb->pkt_type = PACKET_BROADCAST;
428 if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
429 ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
430 tunnel->dev->stats.rx_crc_errors++;
431 tunnel->dev->stats.rx_errors++;
435 if (tunnel->parms.i_flags&TUNNEL_SEQ) {
436 if (!(tpi->flags&TUNNEL_SEQ) ||
437 (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
438 tunnel->dev->stats.rx_fifo_errors++;
439 tunnel->dev->stats.rx_errors++;
442 tunnel->i_seqno = ntohl(tpi->seq) + 1;
445 skb_reset_network_header(skb);
447 err = IP_ECN_decapsulate(iph, skb);
450 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
451 &iph->saddr, iph->tos);
453 ++tunnel->dev->stats.rx_frame_errors;
454 ++tunnel->dev->stats.rx_errors;
459 tstats = this_cpu_ptr(tunnel->dev->tstats);
460 u64_stats_update_begin(&tstats->syncp);
461 tstats->rx_packets++;
462 tstats->rx_bytes += skb->len;
463 u64_stats_update_end(&tstats->syncp);
465 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
467 if (tunnel->dev->type == ARPHRD_ETHER) {
468 skb->protocol = eth_type_trans(skb, tunnel->dev);
469 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
471 skb->dev = tunnel->dev;
474 gro_cells_receive(&tunnel->gro_cells, skb);
481 EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
483 static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
484 struct rtable *rt, __be16 df)
486 struct ip_tunnel *tunnel = netdev_priv(dev);
487 int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len;
491 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
492 - sizeof(struct iphdr) - tunnel->hlen;
494 mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
497 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
499 if (skb->protocol == htons(ETH_P_IP)) {
500 if (!skb_is_gso(skb) &&
501 (df & htons(IP_DF)) && mtu < pkt_size) {
502 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
503 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
507 #if IS_ENABLED(CONFIG_IPV6)
508 else if (skb->protocol == htons(ETH_P_IPV6)) {
509 struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
511 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
512 mtu >= IPV6_MIN_MTU) {
513 if ((tunnel->parms.iph.daddr &&
514 !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
515 rt6->rt6i_dst.plen == 128) {
516 rt6->rt6i_flags |= RTF_MODIFIED;
517 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
521 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
523 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
531 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
532 const struct iphdr *tnl_params, const u8 protocol)
534 struct ip_tunnel *tunnel = netdev_priv(dev);
535 const struct iphdr *inner_iph;
539 struct rtable *rt; /* Route to the other host */
540 unsigned int max_headroom; /* The extra header space needed */
543 bool connected = true;
545 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
547 dst = tnl_params->daddr;
551 if (skb_dst(skb) == NULL) {
552 dev->stats.tx_fifo_errors++;
556 if (skb->protocol == htons(ETH_P_IP)) {
557 rt = skb_rtable(skb);
558 dst = rt_nexthop(rt, inner_iph->daddr);
560 #if IS_ENABLED(CONFIG_IPV6)
561 else if (skb->protocol == htons(ETH_P_IPV6)) {
562 const struct in6_addr *addr6;
563 struct neighbour *neigh;
564 bool do_tx_error_icmp;
567 neigh = dst_neigh_lookup(skb_dst(skb),
568 &ipv6_hdr(skb)->daddr);
572 addr6 = (const struct in6_addr *)&neigh->primary_key;
573 addr_type = ipv6_addr_type(addr6);
575 if (addr_type == IPV6_ADDR_ANY) {
576 addr6 = &ipv6_hdr(skb)->daddr;
577 addr_type = ipv6_addr_type(addr6);
580 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
581 do_tx_error_icmp = true;
583 do_tx_error_icmp = false;
584 dst = addr6->s6_addr32[3];
586 neigh_release(neigh);
587 if (do_tx_error_icmp)
597 tos = tnl_params->tos;
600 if (skb->protocol == htons(ETH_P_IP)) {
601 tos = inner_iph->tos;
603 } else if (skb->protocol == htons(ETH_P_IPV6)) {
604 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
609 init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr,
610 tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link);
612 rt = connected ? tunnel_rtable_get(tunnel, 0) : NULL;
615 rt = ip_route_output_key(tunnel->net, &fl4);
618 dev->stats.tx_carrier_errors++;
622 tunnel_dst_set(tunnel, &rt->dst);
625 if (rt->dst.dev == dev) {
627 dev->stats.collisions++;
631 if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) {
636 if (tunnel->err_count > 0) {
637 if (time_before(jiffies,
638 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
641 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
642 dst_link_failure(skb);
644 tunnel->err_count = 0;
647 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
648 ttl = tnl_params->ttl;
650 if (skb->protocol == htons(ETH_P_IP))
651 ttl = inner_iph->ttl;
652 #if IS_ENABLED(CONFIG_IPV6)
653 else if (skb->protocol == htons(ETH_P_IPV6))
654 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
657 ttl = ip4_dst_hoplimit(&rt->dst);
660 df = tnl_params->frag_off;
661 if (skb->protocol == htons(ETH_P_IP))
662 df |= (inner_iph->frag_off&htons(IP_DF));
664 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
665 + rt->dst.header_len;
666 if (max_headroom > dev->needed_headroom)
667 dev->needed_headroom = max_headroom;
669 if (skb_cow_head(skb, dev->needed_headroom)) {
670 dev->stats.tx_dropped++;
675 err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr, protocol,
676 tos, ttl, df, !net_eq(tunnel->net, dev_net(dev)));
677 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
681 #if IS_ENABLED(CONFIG_IPV6)
683 dst_link_failure(skb);
686 dev->stats.tx_errors++;
689 EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
691 static void ip_tunnel_update(struct ip_tunnel_net *itn,
693 struct net_device *dev,
694 struct ip_tunnel_parm *p,
698 t->parms.iph.saddr = p->iph.saddr;
699 t->parms.iph.daddr = p->iph.daddr;
700 t->parms.i_key = p->i_key;
701 t->parms.o_key = p->o_key;
702 if (dev->type != ARPHRD_ETHER) {
703 memcpy(dev->dev_addr, &p->iph.saddr, 4);
704 memcpy(dev->broadcast, &p->iph.daddr, 4);
706 ip_tunnel_add(itn, t);
708 t->parms.iph.ttl = p->iph.ttl;
709 t->parms.iph.tos = p->iph.tos;
710 t->parms.iph.frag_off = p->iph.frag_off;
712 if (t->parms.link != p->link) {
715 t->parms.link = p->link;
716 mtu = ip_tunnel_bind_dev(dev);
720 ip_tunnel_dst_reset_all(t);
721 netdev_state_change(dev);
724 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
727 struct ip_tunnel *t = netdev_priv(dev);
728 struct net *net = t->net;
729 struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id);
731 BUG_ON(!itn->fb_tunnel_dev);
734 if (dev == itn->fb_tunnel_dev) {
735 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
737 t = netdev_priv(dev);
739 memcpy(p, &t->parms, sizeof(*p));
745 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
748 p->iph.frag_off |= htons(IP_DF);
749 if (!(p->i_flags&TUNNEL_KEY))
751 if (!(p->o_flags&TUNNEL_KEY))
754 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
756 if (!t && (cmd == SIOCADDTUNNEL)) {
757 t = ip_tunnel_create(net, itn, p);
763 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
770 unsigned int nflags = 0;
772 if (ipv4_is_multicast(p->iph.daddr))
773 nflags = IFF_BROADCAST;
774 else if (p->iph.daddr)
775 nflags = IFF_POINTOPOINT;
777 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
782 t = netdev_priv(dev);
788 ip_tunnel_update(itn, t, dev, p, true);
796 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
799 if (dev == itn->fb_tunnel_dev) {
801 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
805 if (t == netdev_priv(itn->fb_tunnel_dev))
809 unregister_netdevice(dev);
820 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
822 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
824 struct ip_tunnel *tunnel = netdev_priv(dev);
825 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
828 new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
833 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
835 static void ip_tunnel_dev_free(struct net_device *dev)
837 struct ip_tunnel *tunnel = netdev_priv(dev);
839 gro_cells_destroy(&tunnel->gro_cells);
840 free_percpu(tunnel->dst_cache);
841 free_percpu(dev->tstats);
845 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
847 struct ip_tunnel *tunnel = netdev_priv(dev);
848 struct ip_tunnel_net *itn;
850 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
852 if (itn->fb_tunnel_dev != dev) {
853 ip_tunnel_del(netdev_priv(dev));
854 unregister_netdevice_queue(dev, head);
857 EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
859 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
860 struct rtnl_link_ops *ops, char *devname)
862 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
863 struct ip_tunnel_parm parms;
866 for (i = 0; i < IP_TNL_HASH_SIZE; i++)
867 INIT_HLIST_HEAD(&itn->tunnels[i]);
870 itn->fb_tunnel_dev = NULL;
874 memset(&parms, 0, sizeof(parms));
876 strlcpy(parms.name, devname, IFNAMSIZ);
879 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
880 /* FB netdevice is special: we have one, and only one per netns.
881 * Allowing to move it to another netns is clearly unsafe.
883 if (!IS_ERR(itn->fb_tunnel_dev)) {
884 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
885 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev));
889 return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev);
891 EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
893 static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head,
894 struct rtnl_link_ops *ops)
896 struct net *net = dev_net(itn->fb_tunnel_dev);
897 struct net_device *dev, *aux;
900 for_each_netdev_safe(net, dev, aux)
901 if (dev->rtnl_link_ops == ops)
902 unregister_netdevice_queue(dev, head);
904 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
906 struct hlist_node *n;
907 struct hlist_head *thead = &itn->tunnels[h];
909 hlist_for_each_entry_safe(t, n, thead, hash_node)
910 /* If dev is in the same netns, it has already
911 * been added to the list by the previous loop.
913 if (!net_eq(dev_net(t->dev), net))
914 unregister_netdevice_queue(t->dev, head);
918 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops)
923 ip_tunnel_destroy(itn, &list, ops);
924 unregister_netdevice_many(&list);
927 EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);
929 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
930 struct ip_tunnel_parm *p)
932 struct ip_tunnel *nt;
933 struct net *net = dev_net(dev);
934 struct ip_tunnel_net *itn;
938 nt = netdev_priv(dev);
939 itn = net_generic(net, nt->ip_tnl_net_id);
941 if (ip_tunnel_find(itn, p, dev->type))
946 err = register_netdevice(dev);
950 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
951 eth_hw_addr_random(dev);
953 mtu = ip_tunnel_bind_dev(dev);
957 ip_tunnel_add(itn, nt);
962 EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
964 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
965 struct ip_tunnel_parm *p)
968 struct ip_tunnel *tunnel = netdev_priv(dev);
969 struct net *net = tunnel->net;
970 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
972 if (dev == itn->fb_tunnel_dev)
975 t = ip_tunnel_find(itn, p, dev->type);
983 if (dev->type != ARPHRD_ETHER) {
984 unsigned int nflags = 0;
986 if (ipv4_is_multicast(p->iph.daddr))
987 nflags = IFF_BROADCAST;
988 else if (p->iph.daddr)
989 nflags = IFF_POINTOPOINT;
991 if ((dev->flags ^ nflags) &
992 (IFF_POINTOPOINT | IFF_BROADCAST))
997 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]);
1000 EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
1002 int ip_tunnel_init(struct net_device *dev)
1004 struct ip_tunnel *tunnel = netdev_priv(dev);
1005 struct iphdr *iph = &tunnel->parms.iph;
1008 dev->destructor = ip_tunnel_dev_free;
1009 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1013 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1014 if (!tunnel->dst_cache) {
1015 free_percpu(dev->tstats);
1019 err = gro_cells_init(&tunnel->gro_cells, dev);
1021 free_percpu(tunnel->dst_cache);
1022 free_percpu(dev->tstats);
1027 tunnel->net = dev_net(dev);
1028 strcpy(tunnel->parms.name, dev->name);
1034 EXPORT_SYMBOL_GPL(ip_tunnel_init);
1036 void ip_tunnel_uninit(struct net_device *dev)
1038 struct ip_tunnel *tunnel = netdev_priv(dev);
1039 struct net *net = tunnel->net;
1040 struct ip_tunnel_net *itn;
1042 itn = net_generic(net, tunnel->ip_tnl_net_id);
1043 /* fb_tunnel_dev will be unregisted in net-exit call. */
1044 if (itn->fb_tunnel_dev != dev)
1045 ip_tunnel_del(netdev_priv(dev));
1047 ip_tunnel_dst_reset_all(tunnel);
1049 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1051 /* Do least required initialization, rest of init is done in tunnel_init call */
1052 void ip_tunnel_setup(struct net_device *dev, int net_id)
1054 struct ip_tunnel *tunnel = netdev_priv(dev);
1055 tunnel->ip_tnl_net_id = net_id;
1057 EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1059 MODULE_LICENSE("GPL");