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c5441932 PS |
1 | /* |
2 | * Copyright (c) 2013 Nicira, Inc. | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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 | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
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> | |
29 | #include <linux/in.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> | |
27d79f3b | 43 | #include <linux/err.h> |
c5441932 PS |
44 | |
45 | #include <net/sock.h> | |
46 | #include <net/ip.h> | |
47 | #include <net/icmp.h> | |
48 | #include <net/protocol.h> | |
49 | #include <net/ip_tunnels.h> | |
50 | #include <net/arp.h> | |
51 | #include <net/checksum.h> | |
52 | #include <net/dsfield.h> | |
53 | #include <net/inet_ecn.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/net_namespace.h> | |
56 | #include <net/netns/generic.h> | |
57 | #include <net/rtnetlink.h> | |
58 | ||
59 | #if IS_ENABLED(CONFIG_IPV6) | |
60 | #include <net/ipv6.h> | |
61 | #include <net/ip6_fib.h> | |
62 | #include <net/ip6_route.h> | |
63 | #endif | |
64 | ||
967680e0 | 65 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
c5441932 PS |
66 | { |
67 | return hash_32((__force u32)key ^ (__force u32)remote, | |
68 | IP_TNL_HASH_BITS); | |
69 | } | |
70 | ||
6c7e7610 ED |
71 | static void __tunnel_dst_set(struct ip_tunnel_dst *idst, |
72 | struct dst_entry *dst) | |
7d442fab TH |
73 | { |
74 | struct dst_entry *old_dst; | |
75 | ||
6c7e7610 ED |
76 | if (dst) { |
77 | if (dst->flags & DST_NOCACHE) | |
78 | dst = NULL; | |
79 | else | |
80 | dst_clone(dst); | |
81 | } | |
82 | old_dst = xchg((__force struct dst_entry **)&idst->dst, dst); | |
7d442fab | 83 | dst_release(old_dst); |
7d442fab TH |
84 | } |
85 | ||
6c7e7610 | 86 | static void tunnel_dst_set(struct ip_tunnel *t, struct dst_entry *dst) |
7d442fab | 87 | { |
9a4aa9af | 88 | __tunnel_dst_set(this_cpu_ptr(t->dst_cache), dst); |
7d442fab TH |
89 | } |
90 | ||
6c7e7610 | 91 | static void tunnel_dst_reset(struct ip_tunnel *t) |
7d442fab TH |
92 | { |
93 | tunnel_dst_set(t, NULL); | |
94 | } | |
95 | ||
9a4aa9af TH |
96 | static void tunnel_dst_reset_all(struct ip_tunnel *t) |
97 | { | |
98 | int i; | |
99 | ||
100 | for_each_possible_cpu(i) | |
101 | __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL); | |
102 | } | |
103 | ||
b045d37b | 104 | static struct rtable *tunnel_rtable_get(struct ip_tunnel *t, u32 cookie) |
7d442fab TH |
105 | { |
106 | struct dst_entry *dst; | |
107 | ||
108 | rcu_read_lock(); | |
9a4aa9af | 109 | dst = rcu_dereference(this_cpu_ptr(t->dst_cache)->dst); |
b045d37b ED |
110 | if (dst) { |
111 | if (dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
112 | rcu_read_unlock(); | |
113 | tunnel_dst_reset(t); | |
114 | return NULL; | |
115 | } | |
7d442fab | 116 | dst_hold(dst); |
7d442fab | 117 | } |
b045d37b ED |
118 | rcu_read_unlock(); |
119 | return (struct rtable *)dst; | |
7d442fab TH |
120 | } |
121 | ||
c5441932 PS |
122 | /* Often modified stats are per cpu, other are shared (netdev->stats) */ |
123 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
124 | struct rtnl_link_stats64 *tot) | |
125 | { | |
126 | int i; | |
127 | ||
128 | for_each_possible_cpu(i) { | |
8f84985f LR |
129 | const struct pcpu_sw_netstats *tstats = |
130 | per_cpu_ptr(dev->tstats, i); | |
c5441932 PS |
131 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
132 | unsigned int start; | |
133 | ||
134 | do { | |
135 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
136 | rx_packets = tstats->rx_packets; | |
137 | tx_packets = tstats->tx_packets; | |
138 | rx_bytes = tstats->rx_bytes; | |
139 | tx_bytes = tstats->tx_bytes; | |
140 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
141 | ||
142 | tot->rx_packets += rx_packets; | |
143 | tot->tx_packets += tx_packets; | |
144 | tot->rx_bytes += rx_bytes; | |
145 | tot->tx_bytes += tx_bytes; | |
146 | } | |
147 | ||
148 | tot->multicast = dev->stats.multicast; | |
149 | ||
150 | tot->rx_crc_errors = dev->stats.rx_crc_errors; | |
151 | tot->rx_fifo_errors = dev->stats.rx_fifo_errors; | |
152 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
153 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
154 | tot->rx_errors = dev->stats.rx_errors; | |
155 | ||
156 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
157 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
158 | tot->tx_dropped = dev->stats.tx_dropped; | |
159 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
160 | tot->tx_errors = dev->stats.tx_errors; | |
161 | ||
162 | tot->collisions = dev->stats.collisions; | |
163 | ||
164 | return tot; | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); | |
167 | ||
168 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, | |
169 | __be16 flags, __be32 key) | |
170 | { | |
171 | if (p->i_flags & TUNNEL_KEY) { | |
172 | if (flags & TUNNEL_KEY) | |
173 | return key == p->i_key; | |
174 | else | |
175 | /* key expected, none present */ | |
176 | return false; | |
177 | } else | |
178 | return !(flags & TUNNEL_KEY); | |
179 | } | |
180 | ||
181 | /* Fallback tunnel: no source, no destination, no key, no options | |
182 | ||
183 | Tunnel hash table: | |
184 | We require exact key match i.e. if a key is present in packet | |
185 | it will match only tunnel with the same key; if it is not present, | |
186 | it will match only keyless tunnel. | |
187 | ||
188 | All keysless packets, if not matched configured keyless tunnels | |
189 | will match fallback tunnel. | |
190 | Given src, dst and key, find appropriate for input tunnel. | |
191 | */ | |
192 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
193 | int link, __be16 flags, | |
194 | __be32 remote, __be32 local, | |
195 | __be32 key) | |
196 | { | |
197 | unsigned int hash; | |
198 | struct ip_tunnel *t, *cand = NULL; | |
199 | struct hlist_head *head; | |
200 | ||
967680e0 | 201 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
202 | head = &itn->tunnels[hash]; |
203 | ||
204 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
205 | if (local != t->parms.iph.saddr || | |
206 | remote != t->parms.iph.daddr || | |
207 | !(t->dev->flags & IFF_UP)) | |
208 | continue; | |
209 | ||
210 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
211 | continue; | |
212 | ||
213 | if (t->parms.link == link) | |
214 | return t; | |
215 | else | |
216 | cand = t; | |
217 | } | |
218 | ||
219 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
220 | if (remote != t->parms.iph.daddr || | |
221 | !(t->dev->flags & IFF_UP)) | |
222 | continue; | |
223 | ||
224 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
225 | continue; | |
226 | ||
227 | if (t->parms.link == link) | |
228 | return t; | |
229 | else if (!cand) | |
230 | cand = t; | |
231 | } | |
232 | ||
967680e0 | 233 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
234 | head = &itn->tunnels[hash]; |
235 | ||
236 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
237 | if ((local != t->parms.iph.saddr && | |
238 | (local != t->parms.iph.daddr || | |
239 | !ipv4_is_multicast(local))) || | |
240 | !(t->dev->flags & IFF_UP)) | |
241 | continue; | |
242 | ||
243 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
244 | continue; | |
245 | ||
246 | if (t->parms.link == link) | |
247 | return t; | |
248 | else if (!cand) | |
249 | cand = t; | |
250 | } | |
251 | ||
252 | if (flags & TUNNEL_NO_KEY) | |
253 | goto skip_key_lookup; | |
254 | ||
255 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
256 | if (t->parms.i_key != key || | |
257 | !(t->dev->flags & IFF_UP)) | |
258 | continue; | |
259 | ||
260 | if (t->parms.link == link) | |
261 | return t; | |
262 | else if (!cand) | |
263 | cand = t; | |
264 | } | |
265 | ||
266 | skip_key_lookup: | |
267 | if (cand) | |
268 | return cand; | |
269 | ||
270 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) | |
271 | return netdev_priv(itn->fb_tunnel_dev); | |
272 | ||
273 | ||
274 | return NULL; | |
275 | } | |
276 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
277 | ||
278 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
279 | struct ip_tunnel_parm *parms) | |
280 | { | |
281 | unsigned int h; | |
282 | __be32 remote; | |
283 | ||
284 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
285 | remote = parms->iph.daddr; | |
286 | else | |
287 | remote = 0; | |
288 | ||
967680e0 | 289 | h = ip_tunnel_hash(parms->i_key, remote); |
c5441932 PS |
290 | return &itn->tunnels[h]; |
291 | } | |
292 | ||
293 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
294 | { | |
295 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
296 | ||
297 | hlist_add_head_rcu(&t->hash_node, head); | |
298 | } | |
299 | ||
300 | static void ip_tunnel_del(struct ip_tunnel *t) | |
301 | { | |
302 | hlist_del_init_rcu(&t->hash_node); | |
303 | } | |
304 | ||
305 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
306 | struct ip_tunnel_parm *parms, | |
307 | int type) | |
308 | { | |
309 | __be32 remote = parms->iph.daddr; | |
310 | __be32 local = parms->iph.saddr; | |
311 | __be32 key = parms->i_key; | |
312 | int link = parms->link; | |
313 | struct ip_tunnel *t = NULL; | |
314 | struct hlist_head *head = ip_bucket(itn, parms); | |
315 | ||
316 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
317 | if (local == t->parms.iph.saddr && | |
318 | remote == t->parms.iph.daddr && | |
319 | key == t->parms.i_key && | |
320 | link == t->parms.link && | |
321 | type == t->dev->type) | |
322 | break; | |
323 | } | |
324 | return t; | |
325 | } | |
326 | ||
327 | static struct net_device *__ip_tunnel_create(struct net *net, | |
328 | const struct rtnl_link_ops *ops, | |
329 | struct ip_tunnel_parm *parms) | |
330 | { | |
331 | int err; | |
332 | struct ip_tunnel *tunnel; | |
333 | struct net_device *dev; | |
334 | char name[IFNAMSIZ]; | |
335 | ||
336 | if (parms->name[0]) | |
337 | strlcpy(name, parms->name, IFNAMSIZ); | |
338 | else { | |
54a5d382 | 339 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
c5441932 PS |
340 | err = -E2BIG; |
341 | goto failed; | |
342 | } | |
343 | strlcpy(name, ops->kind, IFNAMSIZ); | |
344 | strncat(name, "%d", 2); | |
345 | } | |
346 | ||
347 | ASSERT_RTNL(); | |
348 | dev = alloc_netdev(ops->priv_size, name, ops->setup); | |
349 | if (!dev) { | |
350 | err = -ENOMEM; | |
351 | goto failed; | |
352 | } | |
353 | dev_net_set(dev, net); | |
354 | ||
355 | dev->rtnl_link_ops = ops; | |
356 | ||
357 | tunnel = netdev_priv(dev); | |
358 | tunnel->parms = *parms; | |
5e6700b3 | 359 | tunnel->net = net; |
c5441932 PS |
360 | |
361 | err = register_netdevice(dev); | |
362 | if (err) | |
363 | goto failed_free; | |
364 | ||
365 | return dev; | |
366 | ||
367 | failed_free: | |
368 | free_netdev(dev); | |
369 | failed: | |
370 | return ERR_PTR(err); | |
371 | } | |
372 | ||
7d442fab TH |
373 | static inline void init_tunnel_flow(struct flowi4 *fl4, |
374 | int proto, | |
375 | __be32 daddr, __be32 saddr, | |
376 | __be32 key, __u8 tos, int oif) | |
c5441932 PS |
377 | { |
378 | memset(fl4, 0, sizeof(*fl4)); | |
379 | fl4->flowi4_oif = oif; | |
380 | fl4->daddr = daddr; | |
381 | fl4->saddr = saddr; | |
382 | fl4->flowi4_tos = tos; | |
383 | fl4->flowi4_proto = proto; | |
384 | fl4->fl4_gre_key = key; | |
c5441932 PS |
385 | } |
386 | ||
387 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
388 | { | |
389 | struct net_device *tdev = NULL; | |
390 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
391 | const struct iphdr *iph; | |
392 | int hlen = LL_MAX_HEADER; | |
393 | int mtu = ETH_DATA_LEN; | |
394 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
395 | ||
396 | iph = &tunnel->parms.iph; | |
397 | ||
398 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
399 | if (iph->daddr) { | |
400 | struct flowi4 fl4; | |
401 | struct rtable *rt; | |
402 | ||
7d442fab TH |
403 | init_tunnel_flow(&fl4, iph->protocol, iph->daddr, |
404 | iph->saddr, tunnel->parms.o_key, | |
405 | RT_TOS(iph->tos), tunnel->parms.link); | |
406 | rt = ip_route_output_key(tunnel->net, &fl4); | |
407 | ||
c5441932 PS |
408 | if (!IS_ERR(rt)) { |
409 | tdev = rt->dst.dev; | |
6c7e7610 | 410 | tunnel_dst_set(tunnel, &rt->dst); |
c5441932 PS |
411 | ip_rt_put(rt); |
412 | } | |
413 | if (dev->type != ARPHRD_ETHER) | |
414 | dev->flags |= IFF_POINTOPOINT; | |
415 | } | |
416 | ||
417 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 418 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
419 | |
420 | if (tdev) { | |
421 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
422 | mtu = tdev->mtu; | |
423 | } | |
424 | dev->iflink = tunnel->parms.link; | |
425 | ||
426 | dev->needed_headroom = t_hlen + hlen; | |
427 | mtu -= (dev->hard_header_len + t_hlen); | |
428 | ||
429 | if (mtu < 68) | |
430 | mtu = 68; | |
431 | ||
432 | return mtu; | |
433 | } | |
434 | ||
435 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
436 | struct ip_tunnel_net *itn, | |
437 | struct ip_tunnel_parm *parms) | |
438 | { | |
439 | struct ip_tunnel *nt, *fbt; | |
440 | struct net_device *dev; | |
441 | ||
442 | BUG_ON(!itn->fb_tunnel_dev); | |
443 | fbt = netdev_priv(itn->fb_tunnel_dev); | |
444 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); | |
445 | if (IS_ERR(dev)) | |
446 | return NULL; | |
447 | ||
448 | dev->mtu = ip_tunnel_bind_dev(dev); | |
449 | ||
450 | nt = netdev_priv(dev); | |
451 | ip_tunnel_add(itn, nt); | |
452 | return nt; | |
453 | } | |
454 | ||
455 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
456 | const struct tnl_ptk_info *tpi, bool log_ecn_error) | |
457 | { | |
8f84985f | 458 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
459 | const struct iphdr *iph = ip_hdr(skb); |
460 | int err; | |
461 | ||
c5441932 PS |
462 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
463 | if (ipv4_is_multicast(iph->daddr)) { | |
464 | /* Looped back packet, drop it! */ | |
465 | if (rt_is_output_route(skb_rtable(skb))) | |
466 | goto drop; | |
467 | tunnel->dev->stats.multicast++; | |
468 | skb->pkt_type = PACKET_BROADCAST; | |
469 | } | |
470 | #endif | |
471 | ||
472 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
473 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
474 | tunnel->dev->stats.rx_crc_errors++; | |
475 | tunnel->dev->stats.rx_errors++; | |
476 | goto drop; | |
477 | } | |
478 | ||
479 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
480 | if (!(tpi->flags&TUNNEL_SEQ) || | |
481 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
482 | tunnel->dev->stats.rx_fifo_errors++; | |
483 | tunnel->dev->stats.rx_errors++; | |
484 | goto drop; | |
485 | } | |
486 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
487 | } | |
488 | ||
c5441932 PS |
489 | err = IP_ECN_decapsulate(iph, skb); |
490 | if (unlikely(err)) { | |
491 | if (log_ecn_error) | |
492 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
493 | &iph->saddr, iph->tos); | |
494 | if (err > 1) { | |
495 | ++tunnel->dev->stats.rx_frame_errors; | |
496 | ++tunnel->dev->stats.rx_errors; | |
497 | goto drop; | |
498 | } | |
499 | } | |
500 | ||
501 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
502 | u64_stats_update_begin(&tstats->syncp); | |
503 | tstats->rx_packets++; | |
504 | tstats->rx_bytes += skb->len; | |
505 | u64_stats_update_end(&tstats->syncp); | |
506 | ||
81b9eab5 AS |
507 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
508 | ||
3d7b46cd PS |
509 | if (tunnel->dev->type == ARPHRD_ETHER) { |
510 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
511 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
512 | } else { | |
513 | skb->dev = tunnel->dev; | |
514 | } | |
64261f23 | 515 | |
c5441932 PS |
516 | gro_cells_receive(&tunnel->gro_cells, skb); |
517 | return 0; | |
518 | ||
519 | drop: | |
520 | kfree_skb(skb); | |
521 | return 0; | |
522 | } | |
523 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
524 | ||
23a3647b PS |
525 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
526 | struct rtable *rt, __be16 df) | |
527 | { | |
528 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 529 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
530 | int mtu; |
531 | ||
532 | if (df) | |
533 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
534 | - sizeof(struct iphdr) - tunnel->hlen; | |
535 | else | |
536 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
537 | ||
538 | if (skb_dst(skb)) | |
539 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
540 | ||
541 | if (skb->protocol == htons(ETH_P_IP)) { | |
542 | if (!skb_is_gso(skb) && | |
543 | (df & htons(IP_DF)) && mtu < pkt_size) { | |
544 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
545 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
546 | return -E2BIG; | |
547 | } | |
548 | } | |
549 | #if IS_ENABLED(CONFIG_IPV6) | |
550 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
551 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
552 | ||
553 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
554 | mtu >= IPV6_MIN_MTU) { | |
555 | if ((tunnel->parms.iph.daddr && | |
556 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
557 | rt6->rt6i_dst.plen == 128) { | |
558 | rt6->rt6i_flags |= RTF_MODIFIED; | |
559 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
560 | } | |
561 | } | |
562 | ||
563 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
564 | mtu < pkt_size) { | |
565 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
566 | return -E2BIG; | |
567 | } | |
568 | } | |
569 | #endif | |
570 | return 0; | |
571 | } | |
572 | ||
c5441932 | 573 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
bf3d6a8f | 574 | const struct iphdr *tnl_params, const u8 protocol) |
c5441932 PS |
575 | { |
576 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
577 | const struct iphdr *inner_iph; | |
c5441932 PS |
578 | struct flowi4 fl4; |
579 | u8 tos, ttl; | |
580 | __be16 df; | |
b045d37b | 581 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
582 | unsigned int max_headroom; /* The extra header space needed */ |
583 | __be32 dst; | |
0e6fbc5b | 584 | int err; |
7d442fab | 585 | bool connected = true; |
c5441932 PS |
586 | |
587 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
588 | ||
589 | dst = tnl_params->daddr; | |
590 | if (dst == 0) { | |
591 | /* NBMA tunnel */ | |
592 | ||
593 | if (skb_dst(skb) == NULL) { | |
594 | dev->stats.tx_fifo_errors++; | |
595 | goto tx_error; | |
596 | } | |
597 | ||
598 | if (skb->protocol == htons(ETH_P_IP)) { | |
599 | rt = skb_rtable(skb); | |
600 | dst = rt_nexthop(rt, inner_iph->daddr); | |
601 | } | |
602 | #if IS_ENABLED(CONFIG_IPV6) | |
603 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
604 | const struct in6_addr *addr6; | |
605 | struct neighbour *neigh; | |
606 | bool do_tx_error_icmp; | |
607 | int addr_type; | |
608 | ||
609 | neigh = dst_neigh_lookup(skb_dst(skb), | |
610 | &ipv6_hdr(skb)->daddr); | |
611 | if (neigh == NULL) | |
612 | goto tx_error; | |
613 | ||
614 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
615 | addr_type = ipv6_addr_type(addr6); | |
616 | ||
617 | if (addr_type == IPV6_ADDR_ANY) { | |
618 | addr6 = &ipv6_hdr(skb)->daddr; | |
619 | addr_type = ipv6_addr_type(addr6); | |
620 | } | |
621 | ||
622 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
623 | do_tx_error_icmp = true; | |
624 | else { | |
625 | do_tx_error_icmp = false; | |
626 | dst = addr6->s6_addr32[3]; | |
627 | } | |
628 | neigh_release(neigh); | |
629 | if (do_tx_error_icmp) | |
630 | goto tx_error_icmp; | |
631 | } | |
632 | #endif | |
633 | else | |
634 | goto tx_error; | |
7d442fab TH |
635 | |
636 | connected = false; | |
c5441932 PS |
637 | } |
638 | ||
639 | tos = tnl_params->tos; | |
640 | if (tos & 0x1) { | |
641 | tos &= ~0x1; | |
7d442fab | 642 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 643 | tos = inner_iph->tos; |
7d442fab TH |
644 | connected = false; |
645 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 646 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
647 | connected = false; |
648 | } | |
c5441932 PS |
649 | } |
650 | ||
7d442fab TH |
651 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
652 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link); | |
653 | ||
b045d37b | 654 | rt = connected ? tunnel_rtable_get(tunnel, 0) : NULL; |
7d442fab TH |
655 | |
656 | if (!rt) { | |
657 | rt = ip_route_output_key(tunnel->net, &fl4); | |
658 | ||
659 | if (IS_ERR(rt)) { | |
660 | dev->stats.tx_carrier_errors++; | |
661 | goto tx_error; | |
662 | } | |
663 | if (connected) | |
6c7e7610 | 664 | tunnel_dst_set(tunnel, &rt->dst); |
c5441932 | 665 | } |
7d442fab | 666 | |
0e6fbc5b | 667 | if (rt->dst.dev == dev) { |
c5441932 PS |
668 | ip_rt_put(rt); |
669 | dev->stats.collisions++; | |
670 | goto tx_error; | |
671 | } | |
c5441932 | 672 | |
23a3647b PS |
673 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) { |
674 | ip_rt_put(rt); | |
675 | goto tx_error; | |
c5441932 | 676 | } |
c5441932 PS |
677 | |
678 | if (tunnel->err_count > 0) { | |
679 | if (time_before(jiffies, | |
680 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
681 | tunnel->err_count--; | |
682 | ||
11c21a30 | 683 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
c5441932 PS |
684 | dst_link_failure(skb); |
685 | } else | |
686 | tunnel->err_count = 0; | |
687 | } | |
688 | ||
d4a71b15 | 689 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
690 | ttl = tnl_params->ttl; |
691 | if (ttl == 0) { | |
692 | if (skb->protocol == htons(ETH_P_IP)) | |
693 | ttl = inner_iph->ttl; | |
694 | #if IS_ENABLED(CONFIG_IPV6) | |
695 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
696 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
697 | #endif | |
698 | else | |
699 | ttl = ip4_dst_hoplimit(&rt->dst); | |
700 | } | |
701 | ||
23a3647b PS |
702 | df = tnl_params->frag_off; |
703 | if (skb->protocol == htons(ETH_P_IP)) | |
704 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
705 | ||
0e6fbc5b PS |
706 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
707 | + rt->dst.header_len; | |
3e08f4a7 | 708 | if (max_headroom > dev->needed_headroom) |
c5441932 | 709 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
710 | |
711 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
712 | dev->stats.tx_dropped++; | |
3acfa1e7 | 713 | kfree_skb(skb); |
3e08f4a7 | 714 | return; |
c5441932 PS |
715 | } |
716 | ||
8b7ed2d9 | 717 | err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, protocol, |
d4a71b15 | 718 | tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
0e6fbc5b | 719 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
c5441932 | 720 | |
c5441932 PS |
721 | return; |
722 | ||
723 | #if IS_ENABLED(CONFIG_IPV6) | |
724 | tx_error_icmp: | |
725 | dst_link_failure(skb); | |
726 | #endif | |
727 | tx_error: | |
728 | dev->stats.tx_errors++; | |
3acfa1e7 | 729 | kfree_skb(skb); |
c5441932 PS |
730 | } |
731 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
732 | ||
733 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
734 | struct ip_tunnel *t, | |
735 | struct net_device *dev, | |
736 | struct ip_tunnel_parm *p, | |
737 | bool set_mtu) | |
738 | { | |
739 | ip_tunnel_del(t); | |
740 | t->parms.iph.saddr = p->iph.saddr; | |
741 | t->parms.iph.daddr = p->iph.daddr; | |
742 | t->parms.i_key = p->i_key; | |
743 | t->parms.o_key = p->o_key; | |
744 | if (dev->type != ARPHRD_ETHER) { | |
745 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
746 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
747 | } | |
748 | ip_tunnel_add(itn, t); | |
749 | ||
750 | t->parms.iph.ttl = p->iph.ttl; | |
751 | t->parms.iph.tos = p->iph.tos; | |
752 | t->parms.iph.frag_off = p->iph.frag_off; | |
753 | ||
754 | if (t->parms.link != p->link) { | |
755 | int mtu; | |
756 | ||
757 | t->parms.link = p->link; | |
758 | mtu = ip_tunnel_bind_dev(dev); | |
759 | if (set_mtu) | |
760 | dev->mtu = mtu; | |
761 | } | |
9a4aa9af | 762 | tunnel_dst_reset_all(t); |
c5441932 PS |
763 | netdev_state_change(dev); |
764 | } | |
765 | ||
766 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
767 | { | |
768 | int err = 0; | |
769 | struct ip_tunnel *t; | |
770 | struct net *net = dev_net(dev); | |
771 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
772 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); | |
773 | ||
774 | BUG_ON(!itn->fb_tunnel_dev); | |
775 | switch (cmd) { | |
776 | case SIOCGETTUNNEL: | |
777 | t = NULL; | |
778 | if (dev == itn->fb_tunnel_dev) | |
779 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
780 | if (t == NULL) | |
781 | t = netdev_priv(dev); | |
782 | memcpy(p, &t->parms, sizeof(*p)); | |
783 | break; | |
784 | ||
785 | case SIOCADDTUNNEL: | |
786 | case SIOCCHGTUNNEL: | |
787 | err = -EPERM; | |
788 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
789 | goto done; | |
790 | if (p->iph.ttl) | |
791 | p->iph.frag_off |= htons(IP_DF); | |
792 | if (!(p->i_flags&TUNNEL_KEY)) | |
793 | p->i_key = 0; | |
794 | if (!(p->o_flags&TUNNEL_KEY)) | |
795 | p->o_key = 0; | |
796 | ||
797 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
798 | ||
799 | if (!t && (cmd == SIOCADDTUNNEL)) | |
800 | t = ip_tunnel_create(net, itn, p); | |
801 | ||
802 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
803 | if (t != NULL) { | |
804 | if (t->dev != dev) { | |
805 | err = -EEXIST; | |
806 | break; | |
807 | } | |
808 | } else { | |
809 | unsigned int nflags = 0; | |
810 | ||
811 | if (ipv4_is_multicast(p->iph.daddr)) | |
812 | nflags = IFF_BROADCAST; | |
813 | else if (p->iph.daddr) | |
814 | nflags = IFF_POINTOPOINT; | |
815 | ||
816 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
817 | err = -EINVAL; | |
818 | break; | |
819 | } | |
820 | ||
821 | t = netdev_priv(dev); | |
822 | } | |
823 | } | |
824 | ||
825 | if (t) { | |
826 | err = 0; | |
827 | ip_tunnel_update(itn, t, dev, p, true); | |
828 | } else | |
829 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
830 | break; | |
831 | ||
832 | case SIOCDELTUNNEL: | |
833 | err = -EPERM; | |
834 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
835 | goto done; | |
836 | ||
837 | if (dev == itn->fb_tunnel_dev) { | |
838 | err = -ENOENT; | |
839 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
840 | if (t == NULL) | |
841 | goto done; | |
842 | err = -EPERM; | |
843 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
844 | goto done; | |
845 | dev = t->dev; | |
846 | } | |
847 | unregister_netdevice(dev); | |
848 | err = 0; | |
849 | break; | |
850 | ||
851 | default: | |
852 | err = -EINVAL; | |
853 | } | |
854 | ||
855 | done: | |
856 | return err; | |
857 | } | |
858 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
859 | ||
860 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
861 | { | |
862 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
863 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
864 | ||
865 | if (new_mtu < 68 || | |
866 | new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen) | |
867 | return -EINVAL; | |
868 | dev->mtu = new_mtu; | |
869 | return 0; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); | |
872 | ||
873 | static void ip_tunnel_dev_free(struct net_device *dev) | |
874 | { | |
875 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
876 | ||
877 | gro_cells_destroy(&tunnel->gro_cells); | |
9a4aa9af | 878 | free_percpu(tunnel->dst_cache); |
c5441932 PS |
879 | free_percpu(dev->tstats); |
880 | free_netdev(dev); | |
881 | } | |
882 | ||
883 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
884 | { | |
c5441932 PS |
885 | struct ip_tunnel *tunnel = netdev_priv(dev); |
886 | struct ip_tunnel_net *itn; | |
887 | ||
6c742e71 | 888 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
889 | |
890 | if (itn->fb_tunnel_dev != dev) { | |
891 | ip_tunnel_del(netdev_priv(dev)); | |
892 | unregister_netdevice_queue(dev, head); | |
893 | } | |
894 | } | |
895 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
896 | ||
d3b6f614 | 897 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
898 | struct rtnl_link_ops *ops, char *devname) |
899 | { | |
900 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
901 | struct ip_tunnel_parm parms; | |
6261d983 | 902 | unsigned int i; |
c5441932 | 903 | |
6261d983 | 904 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
905 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
906 | |
907 | if (!ops) { | |
908 | itn->fb_tunnel_dev = NULL; | |
909 | return 0; | |
910 | } | |
6261d983 | 911 | |
c5441932 PS |
912 | memset(&parms, 0, sizeof(parms)); |
913 | if (devname) | |
914 | strlcpy(parms.name, devname, IFNAMSIZ); | |
915 | ||
916 | rtnl_lock(); | |
917 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
918 | /* FB netdevice is special: we have one, and only one per netns. |
919 | * Allowing to move it to another netns is clearly unsafe. | |
920 | */ | |
67013282 | 921 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 922 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
67013282 SK |
923 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
924 | } | |
b4de77ad | 925 | rtnl_unlock(); |
c5441932 | 926 | |
27d79f3b | 927 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
928 | } |
929 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
930 | ||
6c742e71 ND |
931 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
932 | struct rtnl_link_ops *ops) | |
c5441932 | 933 | { |
6c742e71 ND |
934 | struct net *net = dev_net(itn->fb_tunnel_dev); |
935 | struct net_device *dev, *aux; | |
c5441932 PS |
936 | int h; |
937 | ||
6c742e71 ND |
938 | for_each_netdev_safe(net, dev, aux) |
939 | if (dev->rtnl_link_ops == ops) | |
940 | unregister_netdevice_queue(dev, head); | |
941 | ||
c5441932 PS |
942 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
943 | struct ip_tunnel *t; | |
944 | struct hlist_node *n; | |
945 | struct hlist_head *thead = &itn->tunnels[h]; | |
946 | ||
947 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
948 | /* If dev is in the same netns, it has already |
949 | * been added to the list by the previous loop. | |
950 | */ | |
951 | if (!net_eq(dev_net(t->dev), net)) | |
952 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 953 | } |
c5441932 PS |
954 | } |
955 | ||
6c742e71 | 956 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
957 | { |
958 | LIST_HEAD(list); | |
959 | ||
960 | rtnl_lock(); | |
6c742e71 | 961 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
962 | unregister_netdevice_many(&list); |
963 | rtnl_unlock(); | |
c5441932 PS |
964 | } |
965 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
966 | ||
967 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
968 | struct ip_tunnel_parm *p) | |
969 | { | |
970 | struct ip_tunnel *nt; | |
971 | struct net *net = dev_net(dev); | |
972 | struct ip_tunnel_net *itn; | |
973 | int mtu; | |
974 | int err; | |
975 | ||
976 | nt = netdev_priv(dev); | |
977 | itn = net_generic(net, nt->ip_tnl_net_id); | |
978 | ||
979 | if (ip_tunnel_find(itn, p, dev->type)) | |
980 | return -EEXIST; | |
981 | ||
5e6700b3 | 982 | nt->net = net; |
c5441932 PS |
983 | nt->parms = *p; |
984 | err = register_netdevice(dev); | |
985 | if (err) | |
986 | goto out; | |
987 | ||
988 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
989 | eth_hw_addr_random(dev); | |
990 | ||
991 | mtu = ip_tunnel_bind_dev(dev); | |
992 | if (!tb[IFLA_MTU]) | |
993 | dev->mtu = mtu; | |
994 | ||
995 | ip_tunnel_add(itn, nt); | |
996 | ||
997 | out: | |
998 | return err; | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1001 | ||
1002 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
1003 | struct ip_tunnel_parm *p) | |
1004 | { | |
6c742e71 | 1005 | struct ip_tunnel *t; |
c5441932 | 1006 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1007 | struct net *net = tunnel->net; |
c5441932 PS |
1008 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1009 | ||
1010 | if (dev == itn->fb_tunnel_dev) | |
1011 | return -EINVAL; | |
1012 | ||
c5441932 PS |
1013 | t = ip_tunnel_find(itn, p, dev->type); |
1014 | ||
1015 | if (t) { | |
1016 | if (t->dev != dev) | |
1017 | return -EEXIST; | |
1018 | } else { | |
6c742e71 | 1019 | t = tunnel; |
c5441932 PS |
1020 | |
1021 | if (dev->type != ARPHRD_ETHER) { | |
1022 | unsigned int nflags = 0; | |
1023 | ||
1024 | if (ipv4_is_multicast(p->iph.daddr)) | |
1025 | nflags = IFF_BROADCAST; | |
1026 | else if (p->iph.daddr) | |
1027 | nflags = IFF_POINTOPOINT; | |
1028 | ||
1029 | if ((dev->flags ^ nflags) & | |
1030 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
1036 | return 0; | |
1037 | } | |
1038 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1039 | ||
1040 | int ip_tunnel_init(struct net_device *dev) | |
1041 | { | |
1042 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1043 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1044 | int err; |
c5441932 PS |
1045 | |
1046 | dev->destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1047 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1048 | if (!dev->tstats) |
1049 | return -ENOMEM; | |
1050 | ||
9a4aa9af TH |
1051 | tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst); |
1052 | if (!tunnel->dst_cache) { | |
1053 | free_percpu(dev->tstats); | |
1054 | return -ENOMEM; | |
1055 | } | |
1056 | ||
c5441932 PS |
1057 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1058 | if (err) { | |
9a4aa9af | 1059 | free_percpu(tunnel->dst_cache); |
c5441932 PS |
1060 | free_percpu(dev->tstats); |
1061 | return err; | |
1062 | } | |
1063 | ||
1064 | tunnel->dev = dev; | |
6c742e71 | 1065 | tunnel->net = dev_net(dev); |
c5441932 PS |
1066 | strcpy(tunnel->parms.name, dev->name); |
1067 | iph->version = 4; | |
1068 | iph->ihl = 5; | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1073 | ||
1074 | void ip_tunnel_uninit(struct net_device *dev) | |
1075 | { | |
c5441932 | 1076 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1077 | struct net *net = tunnel->net; |
c5441932 PS |
1078 | struct ip_tunnel_net *itn; |
1079 | ||
1080 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1081 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1082 | if (itn->fb_tunnel_dev != dev) | |
1083 | ip_tunnel_del(netdev_priv(dev)); | |
7d442fab | 1084 | |
9a4aa9af | 1085 | tunnel_dst_reset_all(tunnel); |
c5441932 PS |
1086 | } |
1087 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1088 | ||
1089 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
1090 | void ip_tunnel_setup(struct net_device *dev, int net_id) | |
1091 | { | |
1092 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1093 | tunnel->ip_tnl_net_id = net_id; | |
1094 | } | |
1095 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1096 | ||
1097 | MODULE_LICENSE("GPL"); |