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 static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
490 struct rtable *rt, __be16 df)
492 struct ip_tunnel *tunnel = netdev_priv(dev);
493 int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len;
497 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
498 - sizeof(struct iphdr) - tunnel->hlen;
500 mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
503 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
505 if (skb->protocol == htons(ETH_P_IP)) {
506 if (!skb_is_gso(skb) &&
507 (df & htons(IP_DF)) && mtu < pkt_size) {
508 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
512 #if IS_ENABLED(CONFIG_IPV6)
513 else if (skb->protocol == htons(ETH_P_IPV6)) {
514 struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
516 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
517 mtu >= IPV6_MIN_MTU) {
518 if ((tunnel->parms.iph.daddr &&
519 !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
520 rt6->rt6i_dst.plen == 128) {
521 rt6->rt6i_flags |= RTF_MODIFIED;
522 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
526 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
528 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
536 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
537 const struct iphdr *tnl_params)
539 struct ip_tunnel *tunnel = netdev_priv(dev);
540 const struct iphdr *inner_iph;
545 struct rtable *rt; /* Route to the other host */
546 struct net_device *tdev; /* Device to other host */
547 unsigned int max_headroom; /* The extra header space needed */
550 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
552 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
553 dst = tnl_params->daddr;
557 if (skb_dst(skb) == NULL) {
558 dev->stats.tx_fifo_errors++;
562 if (skb->protocol == htons(ETH_P_IP)) {
563 rt = skb_rtable(skb);
564 dst = rt_nexthop(rt, inner_iph->daddr);
566 #if IS_ENABLED(CONFIG_IPV6)
567 else if (skb->protocol == htons(ETH_P_IPV6)) {
568 const struct in6_addr *addr6;
569 struct neighbour *neigh;
570 bool do_tx_error_icmp;
573 neigh = dst_neigh_lookup(skb_dst(skb),
574 &ipv6_hdr(skb)->daddr);
578 addr6 = (const struct in6_addr *)&neigh->primary_key;
579 addr_type = ipv6_addr_type(addr6);
581 if (addr_type == IPV6_ADDR_ANY) {
582 addr6 = &ipv6_hdr(skb)->daddr;
583 addr_type = ipv6_addr_type(addr6);
586 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
587 do_tx_error_icmp = true;
589 do_tx_error_icmp = false;
590 dst = addr6->s6_addr32[3];
592 neigh_release(neigh);
593 if (do_tx_error_icmp)
601 tos = tnl_params->tos;
604 if (skb->protocol == htons(ETH_P_IP))
605 tos = inner_iph->tos;
606 else if (skb->protocol == htons(ETH_P_IPV6))
607 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
610 rt = ip_route_output_tunnel(dev_net(dev), &fl4,
611 tunnel->parms.iph.protocol,
612 dst, tnl_params->saddr,
617 dev->stats.tx_carrier_errors++;
624 dev->stats.collisions++;
629 if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) {
634 if (tunnel->err_count > 0) {
635 if (time_before(jiffies,
636 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
639 dst_link_failure(skb);
641 tunnel->err_count = 0;
644 ttl = tnl_params->ttl;
646 if (skb->protocol == htons(ETH_P_IP))
647 ttl = inner_iph->ttl;
648 #if IS_ENABLED(CONFIG_IPV6)
649 else if (skb->protocol == htons(ETH_P_IPV6))
650 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
653 ttl = ip4_dst_hoplimit(&rt->dst);
656 df = tnl_params->frag_off;
657 if (skb->protocol == htons(ETH_P_IP))
658 df |= (inner_iph->frag_off&htons(IP_DF));
660 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr)
661 + rt->dst.header_len;
662 if (max_headroom > dev->needed_headroom) {
663 dev->needed_headroom = max_headroom;
664 if (skb_cow_head(skb, dev->needed_headroom)) {
665 dev->stats.tx_dropped++;
672 skb_dst_set(skb, &rt->dst);
674 /* Push down and install the IP header. */
675 skb_push(skb, sizeof(struct iphdr));
676 skb_reset_network_header(skb);
679 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
682 iph->ihl = sizeof(struct iphdr) >> 2;
684 iph->protocol = tnl_params->protocol;
685 iph->tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
686 iph->daddr = fl4.daddr;
687 iph->saddr = fl4.saddr;
689 tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
691 iptunnel_xmit(skb, dev);
694 #if IS_ENABLED(CONFIG_IPV6)
696 dst_link_failure(skb);
699 dev->stats.tx_errors++;
702 EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
704 static void ip_tunnel_update(struct ip_tunnel_net *itn,
706 struct net_device *dev,
707 struct ip_tunnel_parm *p,
711 t->parms.iph.saddr = p->iph.saddr;
712 t->parms.iph.daddr = p->iph.daddr;
713 t->parms.i_key = p->i_key;
714 t->parms.o_key = p->o_key;
715 if (dev->type != ARPHRD_ETHER) {
716 memcpy(dev->dev_addr, &p->iph.saddr, 4);
717 memcpy(dev->broadcast, &p->iph.daddr, 4);
719 ip_tunnel_add(itn, t);
721 t->parms.iph.ttl = p->iph.ttl;
722 t->parms.iph.tos = p->iph.tos;
723 t->parms.iph.frag_off = p->iph.frag_off;
725 if (t->parms.link != p->link) {
728 t->parms.link = p->link;
729 mtu = ip_tunnel_bind_dev(dev);
733 netdev_state_change(dev);
736 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
740 struct net *net = dev_net(dev);
741 struct ip_tunnel *tunnel = netdev_priv(dev);
742 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
744 BUG_ON(!itn->fb_tunnel_dev);
748 if (dev == itn->fb_tunnel_dev)
749 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
751 t = netdev_priv(dev);
752 memcpy(p, &t->parms, sizeof(*p));
758 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
761 p->iph.frag_off |= htons(IP_DF);
762 if (!(p->i_flags&TUNNEL_KEY))
764 if (!(p->o_flags&TUNNEL_KEY))
767 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
769 if (!t && (cmd == SIOCADDTUNNEL))
770 t = ip_tunnel_create(net, itn, p);
772 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
779 unsigned int nflags = 0;
781 if (ipv4_is_multicast(p->iph.daddr))
782 nflags = IFF_BROADCAST;
783 else if (p->iph.daddr)
784 nflags = IFF_POINTOPOINT;
786 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
791 t = netdev_priv(dev);
797 ip_tunnel_update(itn, t, dev, p, true);
799 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
804 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
807 if (dev == itn->fb_tunnel_dev) {
809 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
813 if (t == netdev_priv(itn->fb_tunnel_dev))
817 unregister_netdevice(dev);
828 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
830 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
832 struct ip_tunnel *tunnel = netdev_priv(dev);
833 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
836 new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
841 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
843 static void ip_tunnel_dev_free(struct net_device *dev)
845 struct ip_tunnel *tunnel = netdev_priv(dev);
847 gro_cells_destroy(&tunnel->gro_cells);
848 free_percpu(dev->tstats);
852 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
854 struct net *net = dev_net(dev);
855 struct ip_tunnel *tunnel = netdev_priv(dev);
856 struct ip_tunnel_net *itn;
858 itn = net_generic(net, tunnel->ip_tnl_net_id);
860 if (itn->fb_tunnel_dev != dev) {
861 ip_tunnel_del(netdev_priv(dev));
862 unregister_netdevice_queue(dev, head);
865 EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
867 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
868 struct rtnl_link_ops *ops, char *devname)
870 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
871 struct ip_tunnel_parm parms;
873 itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL);
878 itn->fb_tunnel_dev = NULL;
881 memset(&parms, 0, sizeof(parms));
883 strlcpy(parms.name, devname, IFNAMSIZ);
886 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
888 if (IS_ERR(itn->fb_tunnel_dev)) {
890 return PTR_ERR(itn->fb_tunnel_dev);
895 EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
897 static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head)
901 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
903 struct hlist_node *n;
904 struct hlist_head *thead = &itn->tunnels[h];
906 hlist_for_each_entry_safe(t, n, thead, hash_node)
907 unregister_netdevice_queue(t->dev, head);
909 if (itn->fb_tunnel_dev)
910 unregister_netdevice_queue(itn->fb_tunnel_dev, head);
913 void ip_tunnel_delete_net(struct ip_tunnel_net *itn)
918 ip_tunnel_destroy(itn, &list);
919 unregister_netdevice_many(&list);
923 EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);
925 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
926 struct ip_tunnel_parm *p)
928 struct ip_tunnel *nt;
929 struct net *net = dev_net(dev);
930 struct ip_tunnel_net *itn;
934 nt = netdev_priv(dev);
935 itn = net_generic(net, nt->ip_tnl_net_id);
937 if (ip_tunnel_find(itn, p, dev->type))
941 err = register_netdevice(dev);
945 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
946 eth_hw_addr_random(dev);
948 mtu = ip_tunnel_bind_dev(dev);
952 ip_tunnel_add(itn, nt);
957 EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
959 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
960 struct ip_tunnel_parm *p)
962 struct ip_tunnel *t, *nt;
963 struct net *net = dev_net(dev);
964 struct ip_tunnel *tunnel = netdev_priv(dev);
965 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
967 if (dev == itn->fb_tunnel_dev)
970 nt = netdev_priv(dev);
972 t = ip_tunnel_find(itn, p, dev->type);
980 if (dev->type != ARPHRD_ETHER) {
981 unsigned int nflags = 0;
983 if (ipv4_is_multicast(p->iph.daddr))
984 nflags = IFF_BROADCAST;
985 else if (p->iph.daddr)
986 nflags = IFF_POINTOPOINT;
988 if ((dev->flags ^ nflags) &
989 (IFF_POINTOPOINT | IFF_BROADCAST))
994 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]);
997 EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
999 int ip_tunnel_init(struct net_device *dev)
1001 struct ip_tunnel *tunnel = netdev_priv(dev);
1002 struct iphdr *iph = &tunnel->parms.iph;
1005 dev->destructor = ip_tunnel_dev_free;
1006 dev->tstats = alloc_percpu(struct pcpu_tstats);
1010 err = gro_cells_init(&tunnel->gro_cells, dev);
1012 free_percpu(dev->tstats);
1017 strcpy(tunnel->parms.name, dev->name);
1023 EXPORT_SYMBOL_GPL(ip_tunnel_init);
1025 void ip_tunnel_uninit(struct net_device *dev)
1027 struct net *net = dev_net(dev);
1028 struct ip_tunnel *tunnel = netdev_priv(dev);
1029 struct ip_tunnel_net *itn;
1031 itn = net_generic(net, tunnel->ip_tnl_net_id);
1032 /* fb_tunnel_dev will be unregisted in net-exit call. */
1033 if (itn->fb_tunnel_dev != dev)
1034 ip_tunnel_del(netdev_priv(dev));
1036 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1038 /* Do least required initialization, rest of init is done in tunnel_init call */
1039 void ip_tunnel_setup(struct net_device *dev, int net_id)
1041 struct ip_tunnel *tunnel = netdev_priv(dev);
1042 tunnel->ip_tnl_net_id = net_id;
1044 EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1046 MODULE_LICENSE("GPL");