Commit | Line | Data |
---|---|---|
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> | |
43 | ||
44 | #include <net/sock.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/icmp.h> | |
47 | #include <net/protocol.h> | |
48 | #include <net/ip_tunnels.h> | |
49 | #include <net/arp.h> | |
50 | #include <net/checksum.h> | |
51 | #include <net/dsfield.h> | |
52 | #include <net/inet_ecn.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/net_namespace.h> | |
55 | #include <net/netns/generic.h> | |
56 | #include <net/rtnetlink.h> | |
57 | ||
58 | #if IS_ENABLED(CONFIG_IPV6) | |
59 | #include <net/ipv6.h> | |
60 | #include <net/ip6_fib.h> | |
61 | #include <net/ip6_route.h> | |
62 | #endif | |
63 | ||
64 | static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn, | |
65 | __be32 key, __be32 remote) | |
66 | { | |
67 | return hash_32((__force u32)key ^ (__force u32)remote, | |
68 | IP_TNL_HASH_BITS); | |
69 | } | |
70 | ||
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) | |
74 | { | |
75 | int i; | |
76 | ||
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; | |
80 | unsigned int start; | |
81 | ||
82 | do { | |
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)); | |
89 | ||
90 | tot->rx_packets += rx_packets; | |
91 | tot->tx_packets += tx_packets; | |
92 | tot->rx_bytes += rx_bytes; | |
93 | tot->tx_bytes += tx_bytes; | |
94 | } | |
95 | ||
96 | tot->multicast = dev->stats.multicast; | |
97 | ||
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; | |
103 | ||
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; | |
109 | ||
110 | tot->collisions = dev->stats.collisions; | |
111 | ||
112 | return tot; | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); | |
115 | ||
116 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, | |
117 | __be16 flags, __be32 key) | |
118 | { | |
119 | if (p->i_flags & TUNNEL_KEY) { | |
120 | if (flags & TUNNEL_KEY) | |
121 | return key == p->i_key; | |
122 | else | |
123 | /* key expected, none present */ | |
124 | return false; | |
125 | } else | |
126 | return !(flags & TUNNEL_KEY); | |
127 | } | |
128 | ||
129 | /* Fallback tunnel: no source, no destination, no key, no options | |
130 | ||
131 | Tunnel hash table: | |
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. | |
135 | ||
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. | |
139 | */ | |
140 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
141 | int link, __be16 flags, | |
142 | __be32 remote, __be32 local, | |
143 | __be32 key) | |
144 | { | |
145 | unsigned int hash; | |
146 | struct ip_tunnel *t, *cand = NULL; | |
147 | struct hlist_head *head; | |
148 | ||
149 | hash = ip_tunnel_hash(itn, key, remote); | |
150 | head = &itn->tunnels[hash]; | |
151 | ||
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)) | |
156 | continue; | |
157 | ||
158 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
159 | continue; | |
160 | ||
161 | if (t->parms.link == link) | |
162 | return t; | |
163 | else | |
164 | cand = t; | |
165 | } | |
166 | ||
167 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
168 | if (remote != t->parms.iph.daddr || | |
296692ca | 169 | t->parms.iph.saddr != 0 || |
c5441932 PS |
170 | !(t->dev->flags & IFF_UP)) |
171 | continue; | |
172 | ||
173 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
174 | continue; | |
175 | ||
176 | if (t->parms.link == link) | |
177 | return t; | |
178 | else if (!cand) | |
179 | cand = t; | |
180 | } | |
181 | ||
182 | hash = ip_tunnel_hash(itn, key, 0); | |
183 | head = &itn->tunnels[hash]; | |
184 | ||
185 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
296692ca DP |
186 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
187 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) | |
188 | continue; | |
189 | ||
190 | if (!(t->dev->flags & IFF_UP)) | |
c5441932 PS |
191 | continue; |
192 | ||
193 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
194 | continue; | |
195 | ||
196 | if (t->parms.link == link) | |
197 | return t; | |
198 | else if (!cand) | |
199 | cand = t; | |
200 | } | |
201 | ||
202 | if (flags & TUNNEL_NO_KEY) | |
203 | goto skip_key_lookup; | |
204 | ||
205 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
206 | if (t->parms.i_key != key || | |
296692ca DP |
207 | t->parms.iph.saddr != 0 || |
208 | t->parms.iph.daddr != 0 || | |
c5441932 PS |
209 | !(t->dev->flags & IFF_UP)) |
210 | continue; | |
211 | ||
212 | if (t->parms.link == link) | |
213 | return t; | |
214 | else if (!cand) | |
215 | cand = t; | |
216 | } | |
217 | ||
218 | skip_key_lookup: | |
219 | if (cand) | |
220 | return cand; | |
221 | ||
222 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) | |
223 | return netdev_priv(itn->fb_tunnel_dev); | |
224 | ||
225 | ||
226 | return NULL; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
229 | ||
230 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
231 | struct ip_tunnel_parm *parms) | |
232 | { | |
233 | unsigned int h; | |
234 | __be32 remote; | |
235 | ||
236 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
237 | remote = parms->iph.daddr; | |
238 | else | |
239 | remote = 0; | |
240 | ||
241 | h = ip_tunnel_hash(itn, parms->i_key, remote); | |
242 | return &itn->tunnels[h]; | |
243 | } | |
244 | ||
245 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
246 | { | |
247 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
248 | ||
249 | hlist_add_head_rcu(&t->hash_node, head); | |
250 | } | |
251 | ||
252 | static void ip_tunnel_del(struct ip_tunnel *t) | |
253 | { | |
254 | hlist_del_init_rcu(&t->hash_node); | |
255 | } | |
256 | ||
257 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
258 | struct ip_tunnel_parm *parms, | |
259 | int type) | |
260 | { | |
261 | __be32 remote = parms->iph.daddr; | |
262 | __be32 local = parms->iph.saddr; | |
263 | __be32 key = parms->i_key; | |
264 | int link = parms->link; | |
265 | struct ip_tunnel *t = NULL; | |
266 | struct hlist_head *head = ip_bucket(itn, parms); | |
267 | ||
268 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
269 | if (local == t->parms.iph.saddr && | |
270 | remote == t->parms.iph.daddr && | |
271 | key == t->parms.i_key && | |
272 | link == t->parms.link && | |
273 | type == t->dev->type) | |
274 | break; | |
275 | } | |
276 | return t; | |
277 | } | |
278 | ||
279 | static struct net_device *__ip_tunnel_create(struct net *net, | |
280 | const struct rtnl_link_ops *ops, | |
281 | struct ip_tunnel_parm *parms) | |
282 | { | |
283 | int err; | |
284 | struct ip_tunnel *tunnel; | |
285 | struct net_device *dev; | |
286 | char name[IFNAMSIZ]; | |
287 | ||
288 | if (parms->name[0]) | |
289 | strlcpy(name, parms->name, IFNAMSIZ); | |
290 | else { | |
54a5d382 | 291 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
c5441932 PS |
292 | err = -E2BIG; |
293 | goto failed; | |
294 | } | |
295 | strlcpy(name, ops->kind, IFNAMSIZ); | |
296 | strncat(name, "%d", 2); | |
297 | } | |
298 | ||
299 | ASSERT_RTNL(); | |
300 | dev = alloc_netdev(ops->priv_size, name, ops->setup); | |
301 | if (!dev) { | |
302 | err = -ENOMEM; | |
303 | goto failed; | |
304 | } | |
305 | dev_net_set(dev, net); | |
306 | ||
307 | dev->rtnl_link_ops = ops; | |
308 | ||
309 | tunnel = netdev_priv(dev); | |
310 | tunnel->parms = *parms; | |
311 | ||
312 | err = register_netdevice(dev); | |
313 | if (err) | |
314 | goto failed_free; | |
315 | ||
316 | return dev; | |
317 | ||
318 | failed_free: | |
319 | free_netdev(dev); | |
320 | failed: | |
321 | return ERR_PTR(err); | |
322 | } | |
323 | ||
324 | static inline struct rtable *ip_route_output_tunnel(struct net *net, | |
325 | struct flowi4 *fl4, | |
326 | int proto, | |
327 | __be32 daddr, __be32 saddr, | |
328 | __be32 key, __u8 tos, int oif) | |
329 | { | |
330 | memset(fl4, 0, sizeof(*fl4)); | |
331 | fl4->flowi4_oif = oif; | |
332 | fl4->daddr = daddr; | |
333 | fl4->saddr = saddr; | |
334 | fl4->flowi4_tos = tos; | |
335 | fl4->flowi4_proto = proto; | |
336 | fl4->fl4_gre_key = key; | |
337 | return ip_route_output_key(net, fl4); | |
338 | } | |
339 | ||
340 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
341 | { | |
342 | struct net_device *tdev = NULL; | |
343 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
344 | const struct iphdr *iph; | |
345 | int hlen = LL_MAX_HEADER; | |
346 | int mtu = ETH_DATA_LEN; | |
347 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
348 | ||
349 | iph = &tunnel->parms.iph; | |
350 | ||
351 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
352 | if (iph->daddr) { | |
353 | struct flowi4 fl4; | |
354 | struct rtable *rt; | |
355 | ||
356 | rt = ip_route_output_tunnel(dev_net(dev), &fl4, | |
357 | tunnel->parms.iph.protocol, | |
358 | iph->daddr, iph->saddr, | |
359 | tunnel->parms.o_key, | |
360 | RT_TOS(iph->tos), | |
361 | tunnel->parms.link); | |
362 | if (!IS_ERR(rt)) { | |
363 | tdev = rt->dst.dev; | |
364 | ip_rt_put(rt); | |
365 | } | |
366 | if (dev->type != ARPHRD_ETHER) | |
367 | dev->flags |= IFF_POINTOPOINT; | |
368 | } | |
369 | ||
370 | if (!tdev && tunnel->parms.link) | |
371 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
372 | ||
373 | if (tdev) { | |
374 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
375 | mtu = tdev->mtu; | |
376 | } | |
377 | dev->iflink = tunnel->parms.link; | |
378 | ||
379 | dev->needed_headroom = t_hlen + hlen; | |
380 | mtu -= (dev->hard_header_len + t_hlen); | |
381 | ||
382 | if (mtu < 68) | |
383 | mtu = 68; | |
384 | ||
385 | return mtu; | |
386 | } | |
387 | ||
388 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
389 | struct ip_tunnel_net *itn, | |
390 | struct ip_tunnel_parm *parms) | |
391 | { | |
392 | struct ip_tunnel *nt, *fbt; | |
393 | struct net_device *dev; | |
394 | ||
395 | BUG_ON(!itn->fb_tunnel_dev); | |
396 | fbt = netdev_priv(itn->fb_tunnel_dev); | |
397 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); | |
398 | if (IS_ERR(dev)) | |
399 | return NULL; | |
400 | ||
401 | dev->mtu = ip_tunnel_bind_dev(dev); | |
402 | ||
403 | nt = netdev_priv(dev); | |
404 | ip_tunnel_add(itn, nt); | |
405 | return nt; | |
406 | } | |
407 | ||
408 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
b9099fea | 409 | const struct tnl_ptk_info *tpi, int hdr_len, bool log_ecn_error) |
c5441932 PS |
410 | { |
411 | struct pcpu_tstats *tstats; | |
412 | const struct iphdr *iph = ip_hdr(skb); | |
413 | int err; | |
414 | ||
415 | secpath_reset(skb); | |
416 | ||
417 | skb->protocol = tpi->proto; | |
418 | ||
419 | skb->mac_header = skb->network_header; | |
b9099fea | 420 | __pskb_pull(skb, hdr_len); |
c5441932 PS |
421 | skb_postpull_rcsum(skb, skb_transport_header(skb), tunnel->hlen); |
422 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
423 | if (ipv4_is_multicast(iph->daddr)) { | |
424 | /* Looped back packet, drop it! */ | |
425 | if (rt_is_output_route(skb_rtable(skb))) | |
426 | goto drop; | |
427 | tunnel->dev->stats.multicast++; | |
428 | skb->pkt_type = PACKET_BROADCAST; | |
429 | } | |
430 | #endif | |
431 | ||
432 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
433 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
434 | tunnel->dev->stats.rx_crc_errors++; | |
435 | tunnel->dev->stats.rx_errors++; | |
436 | goto drop; | |
437 | } | |
438 | ||
439 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
440 | if (!(tpi->flags&TUNNEL_SEQ) || | |
441 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
442 | tunnel->dev->stats.rx_fifo_errors++; | |
443 | tunnel->dev->stats.rx_errors++; | |
444 | goto drop; | |
445 | } | |
446 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
447 | } | |
448 | ||
449 | /* Warning: All skb pointers will be invalidated! */ | |
450 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
451 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
452 | tunnel->dev->stats.rx_length_errors++; | |
453 | tunnel->dev->stats.rx_errors++; | |
454 | goto drop; | |
455 | } | |
456 | ||
457 | iph = ip_hdr(skb); | |
458 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
459 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
460 | } | |
461 | ||
462 | skb->pkt_type = PACKET_HOST; | |
463 | __skb_tunnel_rx(skb, tunnel->dev); | |
464 | ||
465 | skb_reset_network_header(skb); | |
466 | err = IP_ECN_decapsulate(iph, skb); | |
467 | if (unlikely(err)) { | |
468 | if (log_ecn_error) | |
469 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
470 | &iph->saddr, iph->tos); | |
471 | if (err > 1) { | |
472 | ++tunnel->dev->stats.rx_frame_errors; | |
473 | ++tunnel->dev->stats.rx_errors; | |
474 | goto drop; | |
475 | } | |
476 | } | |
477 | ||
478 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
479 | u64_stats_update_begin(&tstats->syncp); | |
480 | tstats->rx_packets++; | |
481 | tstats->rx_bytes += skb->len; | |
482 | u64_stats_update_end(&tstats->syncp); | |
483 | ||
484 | gro_cells_receive(&tunnel->gro_cells, skb); | |
485 | return 0; | |
486 | ||
487 | drop: | |
488 | kfree_skb(skb); | |
489 | return 0; | |
490 | } | |
491 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
492 | ||
edb42cad PS |
493 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
494 | struct rtable *rt, __be16 df) | |
495 | { | |
496 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
6afbcb59 | 497 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
edb42cad PS |
498 | int mtu; |
499 | ||
500 | if (df) | |
501 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
502 | - sizeof(struct iphdr) - tunnel->hlen; | |
503 | else | |
504 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
505 | ||
506 | if (skb_dst(skb)) | |
507 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
508 | ||
509 | if (skb->protocol == htons(ETH_P_IP)) { | |
510 | if (!skb_is_gso(skb) && | |
511 | (df & htons(IP_DF)) && mtu < pkt_size) { | |
512 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
513 | return -E2BIG; | |
514 | } | |
515 | } | |
516 | #if IS_ENABLED(CONFIG_IPV6) | |
517 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
518 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
519 | ||
520 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
521 | mtu >= IPV6_MIN_MTU) { | |
522 | if ((tunnel->parms.iph.daddr && | |
523 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
524 | rt6->rt6i_dst.plen == 128) { | |
525 | rt6->rt6i_flags |= RTF_MODIFIED; | |
526 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
527 | } | |
528 | } | |
529 | ||
530 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
531 | mtu < pkt_size) { | |
532 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
533 | return -E2BIG; | |
534 | } | |
535 | } | |
536 | #endif | |
537 | return 0; | |
538 | } | |
539 | ||
c5441932 PS |
540 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
541 | const struct iphdr *tnl_params) | |
542 | { | |
543 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
544 | const struct iphdr *inner_iph; | |
545 | struct iphdr *iph; | |
546 | struct flowi4 fl4; | |
547 | u8 tos, ttl; | |
548 | __be16 df; | |
549 | struct rtable *rt; /* Route to the other host */ | |
550 | struct net_device *tdev; /* Device to other host */ | |
551 | unsigned int max_headroom; /* The extra header space needed */ | |
552 | __be32 dst; | |
c5441932 PS |
553 | |
554 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
555 | ||
a6222602 | 556 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
c5441932 PS |
557 | dst = tnl_params->daddr; |
558 | if (dst == 0) { | |
559 | /* NBMA tunnel */ | |
560 | ||
561 | if (skb_dst(skb) == NULL) { | |
562 | dev->stats.tx_fifo_errors++; | |
563 | goto tx_error; | |
564 | } | |
565 | ||
566 | if (skb->protocol == htons(ETH_P_IP)) { | |
567 | rt = skb_rtable(skb); | |
568 | dst = rt_nexthop(rt, inner_iph->daddr); | |
569 | } | |
570 | #if IS_ENABLED(CONFIG_IPV6) | |
571 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
572 | const struct in6_addr *addr6; | |
573 | struct neighbour *neigh; | |
574 | bool do_tx_error_icmp; | |
575 | int addr_type; | |
576 | ||
577 | neigh = dst_neigh_lookup(skb_dst(skb), | |
578 | &ipv6_hdr(skb)->daddr); | |
579 | if (neigh == NULL) | |
580 | goto tx_error; | |
581 | ||
582 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
583 | addr_type = ipv6_addr_type(addr6); | |
584 | ||
585 | if (addr_type == IPV6_ADDR_ANY) { | |
586 | addr6 = &ipv6_hdr(skb)->daddr; | |
587 | addr_type = ipv6_addr_type(addr6); | |
588 | } | |
589 | ||
590 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
591 | do_tx_error_icmp = true; | |
592 | else { | |
593 | do_tx_error_icmp = false; | |
594 | dst = addr6->s6_addr32[3]; | |
595 | } | |
596 | neigh_release(neigh); | |
597 | if (do_tx_error_icmp) | |
598 | goto tx_error_icmp; | |
599 | } | |
600 | #endif | |
601 | else | |
602 | goto tx_error; | |
603 | } | |
604 | ||
605 | tos = tnl_params->tos; | |
606 | if (tos & 0x1) { | |
607 | tos &= ~0x1; | |
608 | if (skb->protocol == htons(ETH_P_IP)) | |
609 | tos = inner_iph->tos; | |
610 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
611 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
612 | } | |
613 | ||
614 | rt = ip_route_output_tunnel(dev_net(dev), &fl4, | |
615 | tunnel->parms.iph.protocol, | |
616 | dst, tnl_params->saddr, | |
617 | tunnel->parms.o_key, | |
618 | RT_TOS(tos), | |
619 | tunnel->parms.link); | |
620 | if (IS_ERR(rt)) { | |
621 | dev->stats.tx_carrier_errors++; | |
622 | goto tx_error; | |
623 | } | |
624 | tdev = rt->dst.dev; | |
625 | ||
626 | if (tdev == dev) { | |
627 | ip_rt_put(rt); | |
628 | dev->stats.collisions++; | |
629 | goto tx_error; | |
630 | } | |
631 | ||
c5441932 | 632 | |
edb42cad PS |
633 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) { |
634 | ip_rt_put(rt); | |
635 | goto tx_error; | |
c5441932 | 636 | } |
c5441932 PS |
637 | |
638 | if (tunnel->err_count > 0) { | |
639 | if (time_before(jiffies, | |
640 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
641 | tunnel->err_count--; | |
642 | ||
b5ac5243 | 643 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
c5441932 PS |
644 | dst_link_failure(skb); |
645 | } else | |
646 | tunnel->err_count = 0; | |
647 | } | |
648 | ||
649 | ttl = tnl_params->ttl; | |
650 | if (ttl == 0) { | |
651 | if (skb->protocol == htons(ETH_P_IP)) | |
652 | ttl = inner_iph->ttl; | |
653 | #if IS_ENABLED(CONFIG_IPV6) | |
654 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
655 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
656 | #endif | |
657 | else | |
658 | ttl = ip4_dst_hoplimit(&rt->dst); | |
659 | } | |
660 | ||
edb42cad PS |
661 | df = tnl_params->frag_off; |
662 | if (skb->protocol == htons(ETH_P_IP)) | |
663 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
664 | ||
c5441932 PS |
665 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr) |
666 | + rt->dst.header_len; | |
23d6f8dd | 667 | if (max_headroom > dev->needed_headroom) |
c5441932 | 668 | dev->needed_headroom = max_headroom; |
23d6f8dd SK |
669 | |
670 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
671 | dev->stats.tx_dropped++; | |
672 | dev_kfree_skb(skb); | |
673 | return; | |
c5441932 PS |
674 | } |
675 | ||
676 | skb_dst_drop(skb); | |
677 | skb_dst_set(skb, &rt->dst); | |
c5441932 PS |
678 | |
679 | /* Push down and install the IP header. */ | |
680 | skb_push(skb, sizeof(struct iphdr)); | |
681 | skb_reset_network_header(skb); | |
682 | ||
683 | iph = ip_hdr(skb); | |
684 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
685 | ||
686 | iph->version = 4; | |
687 | iph->ihl = sizeof(struct iphdr) >> 2; | |
688 | iph->frag_off = df; | |
689 | iph->protocol = tnl_params->protocol; | |
690 | iph->tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); | |
691 | iph->daddr = fl4.daddr; | |
692 | iph->saddr = fl4.saddr; | |
693 | iph->ttl = ttl; | |
ff1f69a8 | 694 | __ip_select_ident(iph, skb_shinfo(skb)->gso_segs ?: 1); |
c5441932 PS |
695 | |
696 | iptunnel_xmit(skb, dev); | |
697 | return; | |
698 | ||
699 | #if IS_ENABLED(CONFIG_IPV6) | |
700 | tx_error_icmp: | |
701 | dst_link_failure(skb); | |
702 | #endif | |
703 | tx_error: | |
704 | dev->stats.tx_errors++; | |
705 | dev_kfree_skb(skb); | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
708 | ||
709 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
710 | struct ip_tunnel *t, | |
711 | struct net_device *dev, | |
712 | struct ip_tunnel_parm *p, | |
713 | bool set_mtu) | |
714 | { | |
715 | ip_tunnel_del(t); | |
716 | t->parms.iph.saddr = p->iph.saddr; | |
717 | t->parms.iph.daddr = p->iph.daddr; | |
718 | t->parms.i_key = p->i_key; | |
719 | t->parms.o_key = p->o_key; | |
720 | if (dev->type != ARPHRD_ETHER) { | |
721 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
722 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
723 | } | |
724 | ip_tunnel_add(itn, t); | |
725 | ||
726 | t->parms.iph.ttl = p->iph.ttl; | |
727 | t->parms.iph.tos = p->iph.tos; | |
728 | t->parms.iph.frag_off = p->iph.frag_off; | |
729 | ||
730 | if (t->parms.link != p->link) { | |
731 | int mtu; | |
732 | ||
733 | t->parms.link = p->link; | |
734 | mtu = ip_tunnel_bind_dev(dev); | |
735 | if (set_mtu) | |
736 | dev->mtu = mtu; | |
737 | } | |
738 | netdev_state_change(dev); | |
739 | } | |
740 | ||
741 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
742 | { | |
743 | int err = 0; | |
744 | struct ip_tunnel *t; | |
745 | struct net *net = dev_net(dev); | |
746 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
747 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); | |
748 | ||
749 | BUG_ON(!itn->fb_tunnel_dev); | |
750 | switch (cmd) { | |
751 | case SIOCGETTUNNEL: | |
752 | t = NULL; | |
753 | if (dev == itn->fb_tunnel_dev) | |
754 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
755 | if (t == NULL) | |
756 | t = netdev_priv(dev); | |
757 | memcpy(p, &t->parms, sizeof(*p)); | |
758 | break; | |
759 | ||
760 | case SIOCADDTUNNEL: | |
761 | case SIOCCHGTUNNEL: | |
762 | err = -EPERM; | |
763 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
764 | goto done; | |
765 | if (p->iph.ttl) | |
766 | p->iph.frag_off |= htons(IP_DF); | |
767 | if (!(p->i_flags&TUNNEL_KEY)) | |
768 | p->i_key = 0; | |
769 | if (!(p->o_flags&TUNNEL_KEY)) | |
770 | p->o_key = 0; | |
771 | ||
772 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
773 | ||
774 | if (!t && (cmd == SIOCADDTUNNEL)) | |
775 | t = ip_tunnel_create(net, itn, p); | |
776 | ||
777 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
778 | if (t != NULL) { | |
779 | if (t->dev != dev) { | |
780 | err = -EEXIST; | |
781 | break; | |
782 | } | |
783 | } else { | |
784 | unsigned int nflags = 0; | |
785 | ||
786 | if (ipv4_is_multicast(p->iph.daddr)) | |
787 | nflags = IFF_BROADCAST; | |
788 | else if (p->iph.daddr) | |
789 | nflags = IFF_POINTOPOINT; | |
790 | ||
791 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
792 | err = -EINVAL; | |
793 | break; | |
794 | } | |
795 | ||
796 | t = netdev_priv(dev); | |
797 | } | |
798 | } | |
799 | ||
800 | if (t) { | |
801 | err = 0; | |
802 | ip_tunnel_update(itn, t, dev, p, true); | |
803 | } else | |
804 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
805 | break; | |
806 | ||
807 | case SIOCDELTUNNEL: | |
808 | err = -EPERM; | |
809 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
810 | goto done; | |
811 | ||
812 | if (dev == itn->fb_tunnel_dev) { | |
813 | err = -ENOENT; | |
814 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
815 | if (t == NULL) | |
816 | goto done; | |
817 | err = -EPERM; | |
818 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
819 | goto done; | |
820 | dev = t->dev; | |
821 | } | |
822 | unregister_netdevice(dev); | |
823 | err = 0; | |
824 | break; | |
825 | ||
826 | default: | |
827 | err = -EINVAL; | |
828 | } | |
829 | ||
830 | done: | |
831 | return err; | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
834 | ||
835 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
836 | { | |
837 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
838 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
839 | ||
840 | if (new_mtu < 68 || | |
841 | new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen) | |
842 | return -EINVAL; | |
843 | dev->mtu = new_mtu; | |
844 | return 0; | |
845 | } | |
846 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); | |
847 | ||
848 | static void ip_tunnel_dev_free(struct net_device *dev) | |
849 | { | |
850 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
851 | ||
852 | gro_cells_destroy(&tunnel->gro_cells); | |
853 | free_percpu(dev->tstats); | |
854 | free_netdev(dev); | |
855 | } | |
856 | ||
857 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
858 | { | |
859 | struct net *net = dev_net(dev); | |
860 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
861 | struct ip_tunnel_net *itn; | |
862 | ||
863 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
864 | ||
865 | if (itn->fb_tunnel_dev != dev) { | |
866 | ip_tunnel_del(netdev_priv(dev)); | |
867 | unregister_netdevice_queue(dev, head); | |
868 | } | |
869 | } | |
870 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
871 | ||
d3b6f614 | 872 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
873 | struct rtnl_link_ops *ops, char *devname) |
874 | { | |
875 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
876 | struct ip_tunnel_parm parms; | |
877 | ||
878 | itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL); | |
879 | if (!itn->tunnels) | |
880 | return -ENOMEM; | |
881 | ||
882 | if (!ops) { | |
883 | itn->fb_tunnel_dev = NULL; | |
884 | return 0; | |
885 | } | |
886 | memset(&parms, 0, sizeof(parms)); | |
887 | if (devname) | |
888 | strlcpy(parms.name, devname, IFNAMSIZ); | |
889 | ||
890 | rtnl_lock(); | |
891 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
892 | rtnl_unlock(); | |
893 | if (IS_ERR(itn->fb_tunnel_dev)) { | |
894 | kfree(itn->tunnels); | |
895 | return PTR_ERR(itn->fb_tunnel_dev); | |
896 | } | |
897 | ||
898 | return 0; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
901 | ||
902 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head) | |
903 | { | |
904 | int h; | |
905 | ||
906 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { | |
907 | struct ip_tunnel *t; | |
908 | struct hlist_node *n; | |
909 | struct hlist_head *thead = &itn->tunnels[h]; | |
910 | ||
911 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
912 | unregister_netdevice_queue(t->dev, head); | |
913 | } | |
914 | if (itn->fb_tunnel_dev) | |
915 | unregister_netdevice_queue(itn->fb_tunnel_dev, head); | |
916 | } | |
917 | ||
d3b6f614 | 918 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn) |
c5441932 PS |
919 | { |
920 | LIST_HEAD(list); | |
921 | ||
922 | rtnl_lock(); | |
923 | ip_tunnel_destroy(itn, &list); | |
924 | unregister_netdevice_many(&list); | |
925 | rtnl_unlock(); | |
926 | kfree(itn->tunnels); | |
927 | } | |
928 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
929 | ||
930 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
931 | struct ip_tunnel_parm *p) | |
932 | { | |
933 | struct ip_tunnel *nt; | |
934 | struct net *net = dev_net(dev); | |
935 | struct ip_tunnel_net *itn; | |
936 | int mtu; | |
937 | int err; | |
938 | ||
939 | nt = netdev_priv(dev); | |
940 | itn = net_generic(net, nt->ip_tnl_net_id); | |
941 | ||
942 | if (ip_tunnel_find(itn, p, dev->type)) | |
943 | return -EEXIST; | |
944 | ||
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 | { | |
967 | struct ip_tunnel *t, *nt; | |
968 | struct net *net = dev_net(dev); | |
969 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
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 | ||
975 | nt = netdev_priv(dev); | |
976 | ||
977 | t = ip_tunnel_find(itn, p, dev->type); | |
978 | ||
979 | if (t) { | |
980 | if (t->dev != dev) | |
981 | return -EEXIST; | |
982 | } else { | |
983 | t = nt; | |
984 | ||
985 | if (dev->type != ARPHRD_ETHER) { | |
986 | unsigned int nflags = 0; | |
987 | ||
988 | if (ipv4_is_multicast(p->iph.daddr)) | |
989 | nflags = IFF_BROADCAST; | |
990 | else if (p->iph.daddr) | |
991 | nflags = IFF_POINTOPOINT; | |
992 | ||
993 | if ((dev->flags ^ nflags) & | |
994 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
995 | return -EINVAL; | |
996 | } | |
997 | } | |
998 | ||
999 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
1000 | return 0; | |
1001 | } | |
1002 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1003 | ||
1004 | int ip_tunnel_init(struct net_device *dev) | |
1005 | { | |
1006 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1007 | struct iphdr *iph = &tunnel->parms.iph; | |
1008 | int err; | |
1009 | ||
1010 | dev->destructor = ip_tunnel_dev_free; | |
1011 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1012 | if (!dev->tstats) | |
1013 | return -ENOMEM; | |
1014 | ||
1015 | err = gro_cells_init(&tunnel->gro_cells, dev); | |
1016 | if (err) { | |
1017 | free_percpu(dev->tstats); | |
1018 | return err; | |
1019 | } | |
1020 | ||
1021 | tunnel->dev = dev; | |
1022 | strcpy(tunnel->parms.name, dev->name); | |
1023 | iph->version = 4; | |
1024 | iph->ihl = 5; | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1029 | ||
1030 | void ip_tunnel_uninit(struct net_device *dev) | |
1031 | { | |
1032 | struct net *net = dev_net(dev); | |
1033 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1034 | struct ip_tunnel_net *itn; | |
1035 | ||
1036 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1037 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1038 | if (itn->fb_tunnel_dev != dev) | |
1039 | ip_tunnel_del(netdev_priv(dev)); | |
1040 | } | |
1041 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1042 | ||
1043 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
1044 | void ip_tunnel_setup(struct net_device *dev, int net_id) | |
1045 | { | |
1046 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1047 | tunnel->ip_tnl_net_id = net_id; | |
1048 | } | |
1049 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1050 | ||
1051 | MODULE_LICENSE("GPL"); |