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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 | ||
cf71d2bc | 96 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t) |
9a4aa9af TH |
97 | { |
98 | int i; | |
99 | ||
100 | for_each_possible_cpu(i) | |
101 | __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL); | |
102 | } | |
cf71d2bc | 103 | EXPORT_SYMBOL(ip_tunnel_dst_reset_all); |
9a4aa9af | 104 | |
b045d37b | 105 | static struct rtable *tunnel_rtable_get(struct ip_tunnel *t, u32 cookie) |
7d442fab TH |
106 | { |
107 | struct dst_entry *dst; | |
108 | ||
109 | rcu_read_lock(); | |
9a4aa9af | 110 | dst = rcu_dereference(this_cpu_ptr(t->dst_cache)->dst); |
b045d37b ED |
111 | if (dst) { |
112 | if (dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
113 | rcu_read_unlock(); | |
114 | tunnel_dst_reset(t); | |
115 | return NULL; | |
116 | } | |
7d442fab | 117 | dst_hold(dst); |
7d442fab | 118 | } |
b045d37b ED |
119 | rcu_read_unlock(); |
120 | return (struct rtable *)dst; | |
7d442fab TH |
121 | } |
122 | ||
c5441932 PS |
123 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, |
124 | __be16 flags, __be32 key) | |
125 | { | |
126 | if (p->i_flags & TUNNEL_KEY) { | |
127 | if (flags & TUNNEL_KEY) | |
128 | return key == p->i_key; | |
129 | else | |
130 | /* key expected, none present */ | |
131 | return false; | |
132 | } else | |
133 | return !(flags & TUNNEL_KEY); | |
134 | } | |
135 | ||
136 | /* Fallback tunnel: no source, no destination, no key, no options | |
137 | ||
138 | Tunnel hash table: | |
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. | |
142 | ||
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. | |
146 | */ | |
147 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
148 | int link, __be16 flags, | |
149 | __be32 remote, __be32 local, | |
150 | __be32 key) | |
151 | { | |
152 | unsigned int hash; | |
153 | struct ip_tunnel *t, *cand = NULL; | |
154 | struct hlist_head *head; | |
155 | ||
967680e0 | 156 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
157 | head = &itn->tunnels[hash]; |
158 | ||
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)) | |
163 | continue; | |
164 | ||
165 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
166 | continue; | |
167 | ||
168 | if (t->parms.link == link) | |
169 | return t; | |
170 | else | |
171 | cand = t; | |
172 | } | |
173 | ||
174 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
175 | if (remote != t->parms.iph.daddr || | |
176 | !(t->dev->flags & IFF_UP)) | |
177 | continue; | |
178 | ||
179 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
180 | continue; | |
181 | ||
182 | if (t->parms.link == link) | |
183 | return t; | |
184 | else if (!cand) | |
185 | cand = t; | |
186 | } | |
187 | ||
967680e0 | 188 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
189 | head = &itn->tunnels[hash]; |
190 | ||
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)) | |
196 | continue; | |
197 | ||
198 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
199 | continue; | |
200 | ||
201 | if (t->parms.link == link) | |
202 | return t; | |
203 | else if (!cand) | |
204 | cand = t; | |
205 | } | |
206 | ||
207 | if (flags & TUNNEL_NO_KEY) | |
208 | goto skip_key_lookup; | |
209 | ||
210 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
211 | if (t->parms.i_key != key || | |
212 | !(t->dev->flags & IFF_UP)) | |
213 | continue; | |
214 | ||
215 | if (t->parms.link == link) | |
216 | return t; | |
217 | else if (!cand) | |
218 | cand = t; | |
219 | } | |
220 | ||
221 | skip_key_lookup: | |
222 | if (cand) | |
223 | return cand; | |
224 | ||
225 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) | |
226 | return netdev_priv(itn->fb_tunnel_dev); | |
227 | ||
228 | ||
229 | return NULL; | |
230 | } | |
231 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
232 | ||
233 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
234 | struct ip_tunnel_parm *parms) | |
235 | { | |
236 | unsigned int h; | |
237 | __be32 remote; | |
6d608f06 | 238 | __be32 i_key = parms->i_key; |
c5441932 PS |
239 | |
240 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
241 | remote = parms->iph.daddr; | |
242 | else | |
243 | remote = 0; | |
244 | ||
6d608f06 SK |
245 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
246 | i_key = 0; | |
247 | ||
248 | h = ip_tunnel_hash(i_key, remote); | |
c5441932 PS |
249 | return &itn->tunnels[h]; |
250 | } | |
251 | ||
252 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
253 | { | |
254 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
255 | ||
256 | hlist_add_head_rcu(&t->hash_node, head); | |
257 | } | |
258 | ||
259 | static void ip_tunnel_del(struct ip_tunnel *t) | |
260 | { | |
261 | hlist_del_init_rcu(&t->hash_node); | |
262 | } | |
263 | ||
264 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
265 | struct ip_tunnel_parm *parms, | |
266 | int type) | |
267 | { | |
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); | |
274 | ||
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) | |
281 | break; | |
282 | } | |
283 | return t; | |
284 | } | |
285 | ||
286 | static struct net_device *__ip_tunnel_create(struct net *net, | |
287 | const struct rtnl_link_ops *ops, | |
288 | struct ip_tunnel_parm *parms) | |
289 | { | |
290 | int err; | |
291 | struct ip_tunnel *tunnel; | |
292 | struct net_device *dev; | |
293 | char name[IFNAMSIZ]; | |
294 | ||
295 | if (parms->name[0]) | |
296 | strlcpy(name, parms->name, IFNAMSIZ); | |
297 | else { | |
54a5d382 | 298 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
c5441932 PS |
299 | err = -E2BIG; |
300 | goto failed; | |
301 | } | |
302 | strlcpy(name, ops->kind, IFNAMSIZ); | |
303 | strncat(name, "%d", 2); | |
304 | } | |
305 | ||
306 | ASSERT_RTNL(); | |
307 | dev = alloc_netdev(ops->priv_size, name, ops->setup); | |
308 | if (!dev) { | |
309 | err = -ENOMEM; | |
310 | goto failed; | |
311 | } | |
312 | dev_net_set(dev, net); | |
313 | ||
314 | dev->rtnl_link_ops = ops; | |
315 | ||
316 | tunnel = netdev_priv(dev); | |
317 | tunnel->parms = *parms; | |
5e6700b3 | 318 | tunnel->net = net; |
c5441932 PS |
319 | |
320 | err = register_netdevice(dev); | |
321 | if (err) | |
322 | goto failed_free; | |
323 | ||
324 | return dev; | |
325 | ||
326 | failed_free: | |
327 | free_netdev(dev); | |
328 | failed: | |
329 | return ERR_PTR(err); | |
330 | } | |
331 | ||
7d442fab TH |
332 | static inline void init_tunnel_flow(struct flowi4 *fl4, |
333 | int proto, | |
334 | __be32 daddr, __be32 saddr, | |
335 | __be32 key, __u8 tos, int oif) | |
c5441932 PS |
336 | { |
337 | memset(fl4, 0, sizeof(*fl4)); | |
338 | fl4->flowi4_oif = oif; | |
339 | fl4->daddr = daddr; | |
340 | fl4->saddr = saddr; | |
341 | fl4->flowi4_tos = tos; | |
342 | fl4->flowi4_proto = proto; | |
343 | fl4->fl4_gre_key = key; | |
c5441932 PS |
344 | } |
345 | ||
346 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
347 | { | |
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); | |
354 | ||
355 | iph = &tunnel->parms.iph; | |
356 | ||
357 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
358 | if (iph->daddr) { | |
359 | struct flowi4 fl4; | |
360 | struct rtable *rt; | |
361 | ||
7d442fab TH |
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); | |
366 | ||
c5441932 PS |
367 | if (!IS_ERR(rt)) { |
368 | tdev = rt->dst.dev; | |
6c7e7610 | 369 | tunnel_dst_set(tunnel, &rt->dst); |
c5441932 PS |
370 | ip_rt_put(rt); |
371 | } | |
372 | if (dev->type != ARPHRD_ETHER) | |
373 | dev->flags |= IFF_POINTOPOINT; | |
374 | } | |
375 | ||
376 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 377 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
378 | |
379 | if (tdev) { | |
380 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
381 | mtu = tdev->mtu; | |
382 | } | |
383 | dev->iflink = tunnel->parms.link; | |
384 | ||
385 | dev->needed_headroom = t_hlen + hlen; | |
386 | mtu -= (dev->hard_header_len + t_hlen); | |
387 | ||
388 | if (mtu < 68) | |
389 | mtu = 68; | |
390 | ||
391 | return mtu; | |
392 | } | |
393 | ||
394 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
395 | struct ip_tunnel_net *itn, | |
396 | struct ip_tunnel_parm *parms) | |
397 | { | |
398 | struct ip_tunnel *nt, *fbt; | |
399 | struct net_device *dev; | |
400 | ||
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); | |
404 | if (IS_ERR(dev)) | |
6dd3c9ec | 405 | return ERR_CAST(dev); |
c5441932 PS |
406 | |
407 | dev->mtu = ip_tunnel_bind_dev(dev); | |
408 | ||
409 | nt = netdev_priv(dev); | |
410 | ip_tunnel_add(itn, nt); | |
411 | return nt; | |
412 | } | |
413 | ||
414 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
415 | const struct tnl_ptk_info *tpi, bool log_ecn_error) | |
416 | { | |
8f84985f | 417 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
418 | const struct iphdr *iph = ip_hdr(skb); |
419 | int err; | |
420 | ||
c5441932 PS |
421 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
422 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
423 | tunnel->dev->stats.multicast++; |
424 | skb->pkt_type = PACKET_BROADCAST; | |
425 | } | |
426 | #endif | |
427 | ||
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++; | |
432 | goto drop; | |
433 | } | |
434 | ||
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++; | |
440 | goto drop; | |
441 | } | |
442 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
443 | } | |
444 | ||
e96f2e7c YC |
445 | skb_reset_network_header(skb); |
446 | ||
c5441932 PS |
447 | err = IP_ECN_decapsulate(iph, skb); |
448 | if (unlikely(err)) { | |
449 | if (log_ecn_error) | |
450 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
451 | &iph->saddr, iph->tos); | |
452 | if (err > 1) { | |
453 | ++tunnel->dev->stats.rx_frame_errors; | |
454 | ++tunnel->dev->stats.rx_errors; | |
455 | goto drop; | |
456 | } | |
457 | } | |
458 | ||
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); | |
464 | ||
81b9eab5 AS |
465 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
466 | ||
3d7b46cd PS |
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); | |
470 | } else { | |
471 | skb->dev = tunnel->dev; | |
472 | } | |
64261f23 | 473 | |
c5441932 PS |
474 | gro_cells_receive(&tunnel->gro_cells, skb); |
475 | return 0; | |
476 | ||
477 | drop: | |
478 | kfree_skb(skb); | |
479 | return 0; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
482 | ||
23a3647b PS |
483 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
484 | struct rtable *rt, __be16 df) | |
485 | { | |
486 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 487 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
488 | int mtu; |
489 | ||
490 | if (df) | |
491 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
492 | - sizeof(struct iphdr) - tunnel->hlen; | |
493 | else | |
494 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
495 | ||
496 | if (skb_dst(skb)) | |
497 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
498 | ||
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)); | |
504 | return -E2BIG; | |
505 | } | |
506 | } | |
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); | |
510 | ||
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); | |
518 | } | |
519 | } | |
520 | ||
521 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
522 | mtu < pkt_size) { | |
523 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
524 | return -E2BIG; | |
525 | } | |
526 | } | |
527 | #endif | |
528 | return 0; | |
529 | } | |
530 | ||
c5441932 | 531 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
bf3d6a8f | 532 | const struct iphdr *tnl_params, const u8 protocol) |
c5441932 PS |
533 | { |
534 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
535 | const struct iphdr *inner_iph; | |
c5441932 PS |
536 | struct flowi4 fl4; |
537 | u8 tos, ttl; | |
538 | __be16 df; | |
b045d37b | 539 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
540 | unsigned int max_headroom; /* The extra header space needed */ |
541 | __be32 dst; | |
0e6fbc5b | 542 | int err; |
7d442fab | 543 | bool connected = true; |
c5441932 PS |
544 | |
545 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
546 | ||
547 | dst = tnl_params->daddr; | |
548 | if (dst == 0) { | |
549 | /* NBMA tunnel */ | |
550 | ||
551 | if (skb_dst(skb) == NULL) { | |
552 | dev->stats.tx_fifo_errors++; | |
553 | goto tx_error; | |
554 | } | |
555 | ||
556 | if (skb->protocol == htons(ETH_P_IP)) { | |
557 | rt = skb_rtable(skb); | |
558 | dst = rt_nexthop(rt, inner_iph->daddr); | |
559 | } | |
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; | |
565 | int addr_type; | |
566 | ||
567 | neigh = dst_neigh_lookup(skb_dst(skb), | |
568 | &ipv6_hdr(skb)->daddr); | |
569 | if (neigh == NULL) | |
570 | goto tx_error; | |
571 | ||
572 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
573 | addr_type = ipv6_addr_type(addr6); | |
574 | ||
575 | if (addr_type == IPV6_ADDR_ANY) { | |
576 | addr6 = &ipv6_hdr(skb)->daddr; | |
577 | addr_type = ipv6_addr_type(addr6); | |
578 | } | |
579 | ||
580 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
581 | do_tx_error_icmp = true; | |
582 | else { | |
583 | do_tx_error_icmp = false; | |
584 | dst = addr6->s6_addr32[3]; | |
585 | } | |
586 | neigh_release(neigh); | |
587 | if (do_tx_error_icmp) | |
588 | goto tx_error_icmp; | |
589 | } | |
590 | #endif | |
591 | else | |
592 | goto tx_error; | |
7d442fab TH |
593 | |
594 | connected = false; | |
c5441932 PS |
595 | } |
596 | ||
597 | tos = tnl_params->tos; | |
598 | if (tos & 0x1) { | |
599 | tos &= ~0x1; | |
7d442fab | 600 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 601 | tos = inner_iph->tos; |
7d442fab TH |
602 | connected = false; |
603 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 604 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
605 | connected = false; |
606 | } | |
c5441932 PS |
607 | } |
608 | ||
7d442fab TH |
609 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
610 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link); | |
611 | ||
b045d37b | 612 | rt = connected ? tunnel_rtable_get(tunnel, 0) : NULL; |
7d442fab TH |
613 | |
614 | if (!rt) { | |
615 | rt = ip_route_output_key(tunnel->net, &fl4); | |
616 | ||
617 | if (IS_ERR(rt)) { | |
618 | dev->stats.tx_carrier_errors++; | |
619 | goto tx_error; | |
620 | } | |
621 | if (connected) | |
6c7e7610 | 622 | tunnel_dst_set(tunnel, &rt->dst); |
c5441932 | 623 | } |
7d442fab | 624 | |
0e6fbc5b | 625 | if (rt->dst.dev == dev) { |
c5441932 PS |
626 | ip_rt_put(rt); |
627 | dev->stats.collisions++; | |
628 | goto tx_error; | |
629 | } | |
c5441932 | 630 | |
23a3647b PS |
631 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) { |
632 | ip_rt_put(rt); | |
633 | goto tx_error; | |
c5441932 | 634 | } |
c5441932 PS |
635 | |
636 | if (tunnel->err_count > 0) { | |
637 | if (time_before(jiffies, | |
638 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
639 | tunnel->err_count--; | |
640 | ||
11c21a30 | 641 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
c5441932 PS |
642 | dst_link_failure(skb); |
643 | } else | |
644 | tunnel->err_count = 0; | |
645 | } | |
646 | ||
d4a71b15 | 647 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
648 | ttl = tnl_params->ttl; |
649 | if (ttl == 0) { | |
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; | |
655 | #endif | |
656 | else | |
657 | ttl = ip4_dst_hoplimit(&rt->dst); | |
658 | } | |
659 | ||
23a3647b PS |
660 | df = tnl_params->frag_off; |
661 | if (skb->protocol == htons(ETH_P_IP)) | |
662 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
663 | ||
0e6fbc5b PS |
664 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
665 | + rt->dst.header_len; | |
3e08f4a7 | 666 | if (max_headroom > dev->needed_headroom) |
c5441932 | 667 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
668 | |
669 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
670 | dev->stats.tx_dropped++; | |
3acfa1e7 | 671 | kfree_skb(skb); |
3e08f4a7 | 672 | return; |
c5441932 PS |
673 | } |
674 | ||
aad88724 | 675 | err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr, protocol, |
d4a71b15 | 676 | tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
0e6fbc5b | 677 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
c5441932 | 678 | |
c5441932 PS |
679 | return; |
680 | ||
681 | #if IS_ENABLED(CONFIG_IPV6) | |
682 | tx_error_icmp: | |
683 | dst_link_failure(skb); | |
684 | #endif | |
685 | tx_error: | |
686 | dev->stats.tx_errors++; | |
3acfa1e7 | 687 | kfree_skb(skb); |
c5441932 PS |
688 | } |
689 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
690 | ||
691 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
692 | struct ip_tunnel *t, | |
693 | struct net_device *dev, | |
694 | struct ip_tunnel_parm *p, | |
695 | bool set_mtu) | |
696 | { | |
697 | ip_tunnel_del(t); | |
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); | |
705 | } | |
706 | ip_tunnel_add(itn, t); | |
707 | ||
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; | |
711 | ||
712 | if (t->parms.link != p->link) { | |
713 | int mtu; | |
714 | ||
715 | t->parms.link = p->link; | |
716 | mtu = ip_tunnel_bind_dev(dev); | |
717 | if (set_mtu) | |
718 | dev->mtu = mtu; | |
719 | } | |
cf71d2bc | 720 | ip_tunnel_dst_reset_all(t); |
c5441932 PS |
721 | netdev_state_change(dev); |
722 | } | |
723 | ||
724 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
725 | { | |
726 | int err = 0; | |
8c923ce2 ND |
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); | |
c5441932 PS |
730 | |
731 | BUG_ON(!itn->fb_tunnel_dev); | |
732 | switch (cmd) { | |
733 | case SIOCGETTUNNEL: | |
8c923ce2 | 734 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 735 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
8c923ce2 ND |
736 | if (t == NULL) |
737 | t = netdev_priv(dev); | |
738 | } | |
c5441932 PS |
739 | memcpy(p, &t->parms, sizeof(*p)); |
740 | break; | |
741 | ||
742 | case SIOCADDTUNNEL: | |
743 | case SIOCCHGTUNNEL: | |
744 | err = -EPERM; | |
745 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
746 | goto done; | |
747 | if (p->iph.ttl) | |
748 | p->iph.frag_off |= htons(IP_DF); | |
749 | if (!(p->i_flags&TUNNEL_KEY)) | |
750 | p->i_key = 0; | |
751 | if (!(p->o_flags&TUNNEL_KEY)) | |
752 | p->o_key = 0; | |
753 | ||
754 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
755 | ||
6dd3c9ec | 756 | if (!t && (cmd == SIOCADDTUNNEL)) { |
c5441932 | 757 | t = ip_tunnel_create(net, itn, p); |
6dd3c9ec FW |
758 | if (IS_ERR(t)) { |
759 | err = PTR_ERR(t); | |
760 | break; | |
761 | } | |
762 | } | |
c5441932 PS |
763 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
764 | if (t != NULL) { | |
765 | if (t->dev != dev) { | |
766 | err = -EEXIST; | |
767 | break; | |
768 | } | |
769 | } else { | |
770 | unsigned int nflags = 0; | |
771 | ||
772 | if (ipv4_is_multicast(p->iph.daddr)) | |
773 | nflags = IFF_BROADCAST; | |
774 | else if (p->iph.daddr) | |
775 | nflags = IFF_POINTOPOINT; | |
776 | ||
777 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
778 | err = -EINVAL; | |
779 | break; | |
780 | } | |
781 | ||
782 | t = netdev_priv(dev); | |
783 | } | |
784 | } | |
785 | ||
786 | if (t) { | |
787 | err = 0; | |
788 | ip_tunnel_update(itn, t, dev, p, true); | |
6dd3c9ec FW |
789 | } else { |
790 | err = -ENOENT; | |
791 | } | |
c5441932 PS |
792 | break; |
793 | ||
794 | case SIOCDELTUNNEL: | |
795 | err = -EPERM; | |
796 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
797 | goto done; | |
798 | ||
799 | if (dev == itn->fb_tunnel_dev) { | |
800 | err = -ENOENT; | |
801 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
802 | if (t == NULL) | |
803 | goto done; | |
804 | err = -EPERM; | |
805 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
806 | goto done; | |
807 | dev = t->dev; | |
808 | } | |
809 | unregister_netdevice(dev); | |
810 | err = 0; | |
811 | break; | |
812 | ||
813 | default: | |
814 | err = -EINVAL; | |
815 | } | |
816 | ||
817 | done: | |
818 | return err; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
821 | ||
822 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
823 | { | |
824 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
825 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
826 | ||
827 | if (new_mtu < 68 || | |
828 | new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen) | |
829 | return -EINVAL; | |
830 | dev->mtu = new_mtu; | |
831 | return 0; | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); | |
834 | ||
835 | static void ip_tunnel_dev_free(struct net_device *dev) | |
836 | { | |
837 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
838 | ||
839 | gro_cells_destroy(&tunnel->gro_cells); | |
9a4aa9af | 840 | free_percpu(tunnel->dst_cache); |
c5441932 PS |
841 | free_percpu(dev->tstats); |
842 | free_netdev(dev); | |
843 | } | |
844 | ||
845 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
846 | { | |
c5441932 PS |
847 | struct ip_tunnel *tunnel = netdev_priv(dev); |
848 | struct ip_tunnel_net *itn; | |
849 | ||
6c742e71 | 850 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
851 | |
852 | if (itn->fb_tunnel_dev != dev) { | |
853 | ip_tunnel_del(netdev_priv(dev)); | |
854 | unregister_netdevice_queue(dev, head); | |
855 | } | |
856 | } | |
857 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
858 | ||
d3b6f614 | 859 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
860 | struct rtnl_link_ops *ops, char *devname) |
861 | { | |
862 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
863 | struct ip_tunnel_parm parms; | |
6261d983 | 864 | unsigned int i; |
c5441932 | 865 | |
6261d983 | 866 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
867 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
868 | |
869 | if (!ops) { | |
870 | itn->fb_tunnel_dev = NULL; | |
871 | return 0; | |
872 | } | |
6261d983 | 873 | |
c5441932 PS |
874 | memset(&parms, 0, sizeof(parms)); |
875 | if (devname) | |
876 | strlcpy(parms.name, devname, IFNAMSIZ); | |
877 | ||
878 | rtnl_lock(); | |
879 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
880 | /* FB netdevice is special: we have one, and only one per netns. |
881 | * Allowing to move it to another netns is clearly unsafe. | |
882 | */ | |
67013282 | 883 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 884 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
67013282 SK |
885 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
886 | } | |
b4de77ad | 887 | rtnl_unlock(); |
c5441932 | 888 | |
27d79f3b | 889 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
890 | } |
891 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
892 | ||
6c742e71 ND |
893 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
894 | struct rtnl_link_ops *ops) | |
c5441932 | 895 | { |
6c742e71 ND |
896 | struct net *net = dev_net(itn->fb_tunnel_dev); |
897 | struct net_device *dev, *aux; | |
c5441932 PS |
898 | int h; |
899 | ||
6c742e71 ND |
900 | for_each_netdev_safe(net, dev, aux) |
901 | if (dev->rtnl_link_ops == ops) | |
902 | unregister_netdevice_queue(dev, head); | |
903 | ||
c5441932 PS |
904 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
905 | struct ip_tunnel *t; | |
906 | struct hlist_node *n; | |
907 | struct hlist_head *thead = &itn->tunnels[h]; | |
908 | ||
909 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
910 | /* If dev is in the same netns, it has already |
911 | * been added to the list by the previous loop. | |
912 | */ | |
913 | if (!net_eq(dev_net(t->dev), net)) | |
914 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 915 | } |
c5441932 PS |
916 | } |
917 | ||
6c742e71 | 918 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
919 | { |
920 | LIST_HEAD(list); | |
921 | ||
922 | rtnl_lock(); | |
6c742e71 | 923 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
924 | unregister_netdevice_many(&list); |
925 | rtnl_unlock(); | |
c5441932 PS |
926 | } |
927 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
928 | ||
929 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
930 | struct ip_tunnel_parm *p) | |
931 | { | |
932 | struct ip_tunnel *nt; | |
933 | struct net *net = dev_net(dev); | |
934 | struct ip_tunnel_net *itn; | |
935 | int mtu; | |
936 | int err; | |
937 | ||
938 | nt = netdev_priv(dev); | |
939 | itn = net_generic(net, nt->ip_tnl_net_id); | |
940 | ||
941 | if (ip_tunnel_find(itn, p, dev->type)) | |
942 | return -EEXIST; | |
943 | ||
5e6700b3 | 944 | nt->net = net; |
c5441932 PS |
945 | nt->parms = *p; |
946 | err = register_netdevice(dev); | |
947 | if (err) | |
948 | goto out; | |
949 | ||
950 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
951 | eth_hw_addr_random(dev); | |
952 | ||
953 | mtu = ip_tunnel_bind_dev(dev); | |
954 | if (!tb[IFLA_MTU]) | |
955 | dev->mtu = mtu; | |
956 | ||
957 | ip_tunnel_add(itn, nt); | |
958 | ||
959 | out: | |
960 | return err; | |
961 | } | |
962 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
963 | ||
964 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
965 | struct ip_tunnel_parm *p) | |
966 | { | |
6c742e71 | 967 | struct ip_tunnel *t; |
c5441932 | 968 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 969 | struct net *net = tunnel->net; |
c5441932 PS |
970 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
971 | ||
972 | if (dev == itn->fb_tunnel_dev) | |
973 | return -EINVAL; | |
974 | ||
c5441932 PS |
975 | t = ip_tunnel_find(itn, p, dev->type); |
976 | ||
977 | if (t) { | |
978 | if (t->dev != dev) | |
979 | return -EEXIST; | |
980 | } else { | |
6c742e71 | 981 | t = tunnel; |
c5441932 PS |
982 | |
983 | if (dev->type != ARPHRD_ETHER) { | |
984 | unsigned int nflags = 0; | |
985 | ||
986 | if (ipv4_is_multicast(p->iph.daddr)) | |
987 | nflags = IFF_BROADCAST; | |
988 | else if (p->iph.daddr) | |
989 | nflags = IFF_POINTOPOINT; | |
990 | ||
991 | if ((dev->flags ^ nflags) & | |
992 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
993 | return -EINVAL; | |
994 | } | |
995 | } | |
996 | ||
997 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
998 | return 0; | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1001 | ||
1002 | int ip_tunnel_init(struct net_device *dev) | |
1003 | { | |
1004 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1005 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1006 | int err; |
c5441932 PS |
1007 | |
1008 | dev->destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1009 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1010 | if (!dev->tstats) |
1011 | return -ENOMEM; | |
1012 | ||
9a4aa9af TH |
1013 | tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst); |
1014 | if (!tunnel->dst_cache) { | |
1015 | free_percpu(dev->tstats); | |
1016 | return -ENOMEM; | |
1017 | } | |
1018 | ||
c5441932 PS |
1019 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1020 | if (err) { | |
9a4aa9af | 1021 | free_percpu(tunnel->dst_cache); |
c5441932 PS |
1022 | free_percpu(dev->tstats); |
1023 | return err; | |
1024 | } | |
1025 | ||
1026 | tunnel->dev = dev; | |
6c742e71 | 1027 | tunnel->net = dev_net(dev); |
c5441932 PS |
1028 | strcpy(tunnel->parms.name, dev->name); |
1029 | iph->version = 4; | |
1030 | iph->ihl = 5; | |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1035 | ||
1036 | void ip_tunnel_uninit(struct net_device *dev) | |
1037 | { | |
c5441932 | 1038 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1039 | struct net *net = tunnel->net; |
c5441932 PS |
1040 | struct ip_tunnel_net *itn; |
1041 | ||
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)); | |
7d442fab | 1046 | |
cf71d2bc | 1047 | ip_tunnel_dst_reset_all(tunnel); |
c5441932 PS |
1048 | } |
1049 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1050 | ||
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) | |
1053 | { | |
1054 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1055 | tunnel->ip_tnl_net_id = net_id; | |
1056 | } | |
1057 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1058 | ||
1059 | MODULE_LICENSE("GPL"); |