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>
47 #include <net/protocol.h>
48 #include <net/ip_tunnels.h>
50 #include <net/checksum.h>
51 #include <net/dsfield.h>
52 #include <net/inet_ecn.h>
54 #include <net/net_namespace.h>
55 #include <net/netns/generic.h>
56 #include <net/rtnetlink.h>
58 #if IS_ENABLED(CONFIG_IPV6)
60 #include <net/ip6_fib.h>
61 #include <net/ip6_route.h>
64 static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn,
65 __be32 key, __be32 remote)
67 return hash_32((__force u32)key ^ (__force u32)remote,
71 /* Often modified stats are per cpu, other are shared (netdev->stats) */
72 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
73 struct rtnl_link_stats64 *tot)
77 for_each_possible_cpu(i) {
78 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
79 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
83 start = u64_stats_fetch_begin_bh(&tstats->syncp);
84 rx_packets = tstats->rx_packets;
85 tx_packets = tstats->tx_packets;
86 rx_bytes = tstats->rx_bytes;
87 tx_bytes = tstats->tx_bytes;
88 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
90 tot->rx_packets += rx_packets;
91 tot->tx_packets += tx_packets;
92 tot->rx_bytes += rx_bytes;
93 tot->tx_bytes += tx_bytes;
96 tot->multicast = dev->stats.multicast;
98 tot->rx_crc_errors = dev->stats.rx_crc_errors;
99 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
100 tot->rx_length_errors = dev->stats.rx_length_errors;
101 tot->rx_frame_errors = dev->stats.rx_frame_errors;
102 tot->rx_errors = dev->stats.rx_errors;
104 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
105 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
106 tot->tx_dropped = dev->stats.tx_dropped;
107 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
108 tot->tx_errors = dev->stats.tx_errors;
110 tot->collisions = dev->stats.collisions;
114 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
116 static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
117 __be16 flags, __be32 key)
119 if (p->i_flags & TUNNEL_KEY) {
120 if (flags & TUNNEL_KEY)
121 return key == p->i_key;
123 /* key expected, none present */
126 return !(flags & TUNNEL_KEY);
129 /* Fallback tunnel: no source, no destination, no key, no options
132 We require exact key match i.e. if a key is present in packet
133 it will match only tunnel with the same key; if it is not present,
134 it will match only keyless tunnel.
136 All keysless packets, if not matched configured keyless tunnels
137 will match fallback tunnel.
138 Given src, dst and key, find appropriate for input tunnel.
140 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
141 int link, __be16 flags,
142 __be32 remote, __be32 local,
146 struct ip_tunnel *t, *cand = NULL;
147 struct hlist_head *head;
149 hash = ip_tunnel_hash(itn, key, remote);
150 head = &itn->tunnels[hash];
152 hlist_for_each_entry_rcu(t, head, hash_node) {
153 if (local != t->parms.iph.saddr ||
154 remote != t->parms.iph.daddr ||
155 !(t->dev->flags & IFF_UP))
158 if (!ip_tunnel_key_match(&t->parms, flags, key))
161 if (t->parms.link == link)
167 hlist_for_each_entry_rcu(t, head, hash_node) {
168 if (remote != t->parms.iph.daddr ||
169 !(t->dev->flags & IFF_UP))
172 if (!ip_tunnel_key_match(&t->parms, flags, key))
175 if (t->parms.link == link)
181 hash = ip_tunnel_hash(itn, key, 0);
182 head = &itn->tunnels[hash];
184 hlist_for_each_entry_rcu(t, head, hash_node) {
185 if ((local != t->parms.iph.saddr &&
186 (local != t->parms.iph.daddr ||
187 !ipv4_is_multicast(local))) ||
188 !(t->dev->flags & IFF_UP))
191 if (!ip_tunnel_key_match(&t->parms, flags, key))
194 if (t->parms.link == link)
200 if (flags & TUNNEL_NO_KEY)
201 goto skip_key_lookup;
203 hlist_for_each_entry_rcu(t, head, hash_node) {
204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
208 if (t->parms.link == link)
218 if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
219 return netdev_priv(itn->fb_tunnel_dev);
224 EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
226 static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
227 struct ip_tunnel_parm *parms)
232 if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
233 remote = parms->iph.daddr;
237 h = ip_tunnel_hash(itn, parms->i_key, remote);
238 return &itn->tunnels[h];
241 static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
243 struct hlist_head *head = ip_bucket(itn, &t->parms);
245 hlist_add_head_rcu(&t->hash_node, head);
248 static void ip_tunnel_del(struct ip_tunnel *t)
250 hlist_del_init_rcu(&t->hash_node);
253 static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
254 struct ip_tunnel_parm *parms,
257 __be32 remote = parms->iph.daddr;
258 __be32 local = parms->iph.saddr;
259 __be32 key = parms->i_key;
260 int link = parms->link;
261 struct ip_tunnel *t = NULL;
262 struct hlist_head *head = ip_bucket(itn, parms);
264 hlist_for_each_entry_rcu(t, head, hash_node) {
265 if (local == t->parms.iph.saddr &&
266 remote == t->parms.iph.daddr &&
267 key == t->parms.i_key &&
268 link == t->parms.link &&
269 type == t->dev->type)
275 static struct net_device *__ip_tunnel_create(struct net *net,
276 const struct rtnl_link_ops *ops,
277 struct ip_tunnel_parm *parms)
280 struct ip_tunnel *tunnel;
281 struct net_device *dev;
285 strlcpy(name, parms->name, IFNAMSIZ);
287 if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
291 strlcpy(name, ops->kind, IFNAMSIZ);
292 strncat(name, "%d", 2);
296 dev = alloc_netdev(ops->priv_size, name, ops->setup);
301 dev_net_set(dev, net);
303 dev->rtnl_link_ops = ops;
305 tunnel = netdev_priv(dev);
306 tunnel->parms = *parms;
308 err = register_netdevice(dev);
320 static inline struct rtable *ip_route_output_tunnel(struct net *net,
323 __be32 daddr, __be32 saddr,
324 __be32 key, __u8 tos, int oif)
326 memset(fl4, 0, sizeof(*fl4));
327 fl4->flowi4_oif = oif;
330 fl4->flowi4_tos = tos;
331 fl4->flowi4_proto = proto;
332 fl4->fl4_gre_key = key;
333 return ip_route_output_key(net, fl4);
336 static int ip_tunnel_bind_dev(struct net_device *dev)
338 struct net_device *tdev = NULL;
339 struct ip_tunnel *tunnel = netdev_priv(dev);
340 const struct iphdr *iph;
341 int hlen = LL_MAX_HEADER;
342 int mtu = ETH_DATA_LEN;
343 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
345 iph = &tunnel->parms.iph;
347 /* Guess output device to choose reasonable mtu and needed_headroom */
352 rt = ip_route_output_tunnel(dev_net(dev), &fl4,
353 tunnel->parms.iph.protocol,
354 iph->daddr, iph->saddr,
362 if (dev->type != ARPHRD_ETHER)
363 dev->flags |= IFF_POINTOPOINT;
366 if (!tdev && tunnel->parms.link)
367 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
370 hlen = tdev->hard_header_len + tdev->needed_headroom;
373 dev->iflink = tunnel->parms.link;
375 dev->needed_headroom = t_hlen + hlen;
376 mtu -= (dev->hard_header_len + t_hlen);
384 static struct ip_tunnel *ip_tunnel_create(struct net *net,
385 struct ip_tunnel_net *itn,
386 struct ip_tunnel_parm *parms)
388 struct ip_tunnel *nt, *fbt;
389 struct net_device *dev;
391 BUG_ON(!itn->fb_tunnel_dev);
392 fbt = netdev_priv(itn->fb_tunnel_dev);
393 dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
397 dev->mtu = ip_tunnel_bind_dev(dev);
399 nt = netdev_priv(dev);
400 ip_tunnel_add(itn, nt);
404 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
405 const struct tnl_ptk_info *tpi, bool log_ecn_error)
407 struct pcpu_tstats *tstats;
408 const struct iphdr *iph = ip_hdr(skb);
413 skb->protocol = tpi->proto;
415 skb->mac_header = skb->network_header;
416 __pskb_pull(skb, tunnel->hlen);
417 skb_postpull_rcsum(skb, skb_transport_header(skb), tunnel->hlen);
418 #ifdef CONFIG_NET_IPGRE_BROADCAST
419 if (ipv4_is_multicast(iph->daddr)) {
420 /* Looped back packet, drop it! */
421 if (rt_is_output_route(skb_rtable(skb)))
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 /* Warning: All skb pointers will be invalidated! */
446 if (tunnel->dev->type == ARPHRD_ETHER) {
447 if (!pskb_may_pull(skb, ETH_HLEN)) {
448 tunnel->dev->stats.rx_length_errors++;
449 tunnel->dev->stats.rx_errors++;
454 skb->protocol = eth_type_trans(skb, tunnel->dev);
455 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
458 skb->pkt_type = PACKET_HOST;
459 __skb_tunnel_rx(skb, tunnel->dev);
461 skb_reset_network_header(skb);
462 err = IP_ECN_decapsulate(iph, skb);
465 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
466 &iph->saddr, iph->tos);
468 ++tunnel->dev->stats.rx_frame_errors;
469 ++tunnel->dev->stats.rx_errors;
474 tstats = this_cpu_ptr(tunnel->dev->tstats);
475 u64_stats_update_begin(&tstats->syncp);
476 tstats->rx_packets++;
477 tstats->rx_bytes += skb->len;
478 u64_stats_update_end(&tstats->syncp);
480 gro_cells_receive(&tunnel->gro_cells, skb);
487 EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
489 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
490 const struct iphdr *tnl_params)
492 struct ip_tunnel *tunnel = netdev_priv(dev);
493 const struct iphdr *inner_iph;
498 struct rtable *rt; /* Route to the other host */
499 struct net_device *tdev; /* Device to other host */
500 unsigned int max_headroom; /* The extra header space needed */
504 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
506 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
507 dst = tnl_params->daddr;
511 if (skb_dst(skb) == NULL) {
512 dev->stats.tx_fifo_errors++;
516 if (skb->protocol == htons(ETH_P_IP)) {
517 rt = skb_rtable(skb);
518 dst = rt_nexthop(rt, inner_iph->daddr);
520 #if IS_ENABLED(CONFIG_IPV6)
521 else if (skb->protocol == htons(ETH_P_IPV6)) {
522 const struct in6_addr *addr6;
523 struct neighbour *neigh;
524 bool do_tx_error_icmp;
527 neigh = dst_neigh_lookup(skb_dst(skb),
528 &ipv6_hdr(skb)->daddr);
532 addr6 = (const struct in6_addr *)&neigh->primary_key;
533 addr_type = ipv6_addr_type(addr6);
535 if (addr_type == IPV6_ADDR_ANY) {
536 addr6 = &ipv6_hdr(skb)->daddr;
537 addr_type = ipv6_addr_type(addr6);
540 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
541 do_tx_error_icmp = true;
543 do_tx_error_icmp = false;
544 dst = addr6->s6_addr32[3];
546 neigh_release(neigh);
547 if (do_tx_error_icmp)
555 tos = tnl_params->tos;
558 if (skb->protocol == htons(ETH_P_IP))
559 tos = inner_iph->tos;
560 else if (skb->protocol == htons(ETH_P_IPV6))
561 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
564 rt = ip_route_output_tunnel(dev_net(dev), &fl4,
565 tunnel->parms.iph.protocol,
566 dst, tnl_params->saddr,
571 dev->stats.tx_carrier_errors++;
578 dev->stats.collisions++;
582 df = tnl_params->frag_off;
585 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
586 - sizeof(struct iphdr);
588 mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
591 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
593 if (skb->protocol == htons(ETH_P_IP)) {
594 df |= (inner_iph->frag_off&htons(IP_DF));
596 if (!skb_is_gso(skb) &&
597 (inner_iph->frag_off&htons(IP_DF)) &&
598 mtu < ntohs(inner_iph->tot_len)) {
599 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
604 #if IS_ENABLED(CONFIG_IPV6)
605 else if (skb->protocol == htons(ETH_P_IPV6)) {
606 struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
608 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
609 mtu >= IPV6_MIN_MTU) {
610 if ((tunnel->parms.iph.daddr &&
611 !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
612 rt6->rt6i_dst.plen == 128) {
613 rt6->rt6i_flags |= RTF_MODIFIED;
614 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
618 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
620 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
627 if (tunnel->err_count > 0) {
628 if (time_before(jiffies,
629 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
632 dst_link_failure(skb);
634 tunnel->err_count = 0;
637 ttl = tnl_params->ttl;
639 if (skb->protocol == htons(ETH_P_IP))
640 ttl = inner_iph->ttl;
641 #if IS_ENABLED(CONFIG_IPV6)
642 else if (skb->protocol == htons(ETH_P_IPV6))
643 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
646 ttl = ip4_dst_hoplimit(&rt->dst);
649 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr)
650 + rt->dst.header_len;
651 if (max_headroom > dev->needed_headroom) {
652 dev->needed_headroom = max_headroom;
653 if (skb_cow_head(skb, dev->needed_headroom)) {
654 dev->stats.tx_dropped++;
661 skb_dst_set(skb, &rt->dst);
663 /* Push down and install the IP header. */
664 skb_push(skb, sizeof(struct iphdr));
665 skb_reset_network_header(skb);
668 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
671 iph->ihl = sizeof(struct iphdr) >> 2;
673 iph->protocol = tnl_params->protocol;
674 iph->tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
675 iph->daddr = fl4.daddr;
676 iph->saddr = fl4.saddr;
678 tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
680 iptunnel_xmit(skb, dev);
683 #if IS_ENABLED(CONFIG_IPV6)
685 dst_link_failure(skb);
688 dev->stats.tx_errors++;
691 EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
693 static void ip_tunnel_update(struct ip_tunnel_net *itn,
695 struct net_device *dev,
696 struct ip_tunnel_parm *p,
700 t->parms.iph.saddr = p->iph.saddr;
701 t->parms.iph.daddr = p->iph.daddr;
702 t->parms.i_key = p->i_key;
703 t->parms.o_key = p->o_key;
704 if (dev->type != ARPHRD_ETHER) {
705 memcpy(dev->dev_addr, &p->iph.saddr, 4);
706 memcpy(dev->broadcast, &p->iph.daddr, 4);
708 ip_tunnel_add(itn, t);
710 t->parms.iph.ttl = p->iph.ttl;
711 t->parms.iph.tos = p->iph.tos;
712 t->parms.iph.frag_off = p->iph.frag_off;
714 if (t->parms.link != p->link) {
717 t->parms.link = p->link;
718 mtu = ip_tunnel_bind_dev(dev);
722 netdev_state_change(dev);
725 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
729 struct net *net = dev_net(dev);
730 struct ip_tunnel *tunnel = netdev_priv(dev);
731 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
733 BUG_ON(!itn->fb_tunnel_dev);
737 if (dev == itn->fb_tunnel_dev)
738 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
740 t = netdev_priv(dev);
741 memcpy(p, &t->parms, sizeof(*p));
747 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
750 p->iph.frag_off |= htons(IP_DF);
751 if (!(p->i_flags&TUNNEL_KEY))
753 if (!(p->o_flags&TUNNEL_KEY))
756 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
758 if (!t && (cmd == SIOCADDTUNNEL))
759 t = ip_tunnel_create(net, itn, p);
761 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
768 unsigned int nflags = 0;
770 if (ipv4_is_multicast(p->iph.daddr))
771 nflags = IFF_BROADCAST;
772 else if (p->iph.daddr)
773 nflags = IFF_POINTOPOINT;
775 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
780 t = netdev_priv(dev);
786 ip_tunnel_update(itn, t, dev, p, true);
788 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
793 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
796 if (dev == itn->fb_tunnel_dev) {
798 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
802 if (t == netdev_priv(itn->fb_tunnel_dev))
806 unregister_netdevice(dev);
817 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
819 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
821 struct ip_tunnel *tunnel = netdev_priv(dev);
822 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
825 new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
830 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
832 static void ip_tunnel_dev_free(struct net_device *dev)
834 struct ip_tunnel *tunnel = netdev_priv(dev);
836 gro_cells_destroy(&tunnel->gro_cells);
837 free_percpu(dev->tstats);
841 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
843 struct net *net = dev_net(dev);
844 struct ip_tunnel *tunnel = netdev_priv(dev);
845 struct ip_tunnel_net *itn;
847 itn = net_generic(net, tunnel->ip_tnl_net_id);
849 if (itn->fb_tunnel_dev != dev) {
850 ip_tunnel_del(netdev_priv(dev));
851 unregister_netdevice_queue(dev, head);
854 EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
856 int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
857 struct rtnl_link_ops *ops, char *devname)
859 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
860 struct ip_tunnel_parm parms;
862 itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL);
867 itn->fb_tunnel_dev = NULL;
870 memset(&parms, 0, sizeof(parms));
872 strlcpy(parms.name, devname, IFNAMSIZ);
875 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
877 if (IS_ERR(itn->fb_tunnel_dev)) {
879 return PTR_ERR(itn->fb_tunnel_dev);
884 EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
886 static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head)
890 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
892 struct hlist_node *n;
893 struct hlist_head *thead = &itn->tunnels[h];
895 hlist_for_each_entry_safe(t, n, thead, hash_node)
896 unregister_netdevice_queue(t->dev, head);
898 if (itn->fb_tunnel_dev)
899 unregister_netdevice_queue(itn->fb_tunnel_dev, head);
902 void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn)
907 ip_tunnel_destroy(itn, &list);
908 unregister_netdevice_many(&list);
912 EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);
914 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
915 struct ip_tunnel_parm *p)
917 struct ip_tunnel *nt;
918 struct net *net = dev_net(dev);
919 struct ip_tunnel_net *itn;
923 nt = netdev_priv(dev);
924 itn = net_generic(net, nt->ip_tnl_net_id);
926 if (ip_tunnel_find(itn, p, dev->type))
930 err = register_netdevice(dev);
934 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
935 eth_hw_addr_random(dev);
937 mtu = ip_tunnel_bind_dev(dev);
941 ip_tunnel_add(itn, nt);
946 EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
948 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
949 struct ip_tunnel_parm *p)
951 struct ip_tunnel *t, *nt;
952 struct net *net = dev_net(dev);
953 struct ip_tunnel *tunnel = netdev_priv(dev);
954 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
956 if (dev == itn->fb_tunnel_dev)
959 nt = netdev_priv(dev);
961 t = ip_tunnel_find(itn, p, dev->type);
969 if (dev->type != ARPHRD_ETHER) {
970 unsigned int nflags = 0;
972 if (ipv4_is_multicast(p->iph.daddr))
973 nflags = IFF_BROADCAST;
974 else if (p->iph.daddr)
975 nflags = IFF_POINTOPOINT;
977 if ((dev->flags ^ nflags) &
978 (IFF_POINTOPOINT | IFF_BROADCAST))
983 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]);
986 EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
988 int ip_tunnel_init(struct net_device *dev)
990 struct ip_tunnel *tunnel = netdev_priv(dev);
991 struct iphdr *iph = &tunnel->parms.iph;
994 dev->destructor = ip_tunnel_dev_free;
995 dev->tstats = alloc_percpu(struct pcpu_tstats);
999 err = gro_cells_init(&tunnel->gro_cells, dev);
1001 free_percpu(dev->tstats);
1006 strcpy(tunnel->parms.name, dev->name);
1012 EXPORT_SYMBOL_GPL(ip_tunnel_init);
1014 void ip_tunnel_uninit(struct net_device *dev)
1016 struct net *net = dev_net(dev);
1017 struct ip_tunnel *tunnel = netdev_priv(dev);
1018 struct ip_tunnel_net *itn;
1020 itn = net_generic(net, tunnel->ip_tnl_net_id);
1021 /* fb_tunnel_dev will be unregisted in net-exit call. */
1022 if (itn->fb_tunnel_dev != dev)
1023 ip_tunnel_del(netdev_priv(dev));
1025 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1027 /* Do least required initialization, rest of init is done in tunnel_init call */
1028 void ip_tunnel_setup(struct net_device *dev, int net_id)
1030 struct ip_tunnel *tunnel = netdev_priv(dev);
1031 tunnel->ip_tnl_net_id = net_id;
1033 EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1035 MODULE_LICENSE("GPL");