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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> | |
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 || | |
169 | !(t->dev->flags & IFF_UP)) | |
170 | continue; | |
171 | ||
172 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
173 | continue; | |
174 | ||
175 | if (t->parms.link == link) | |
176 | return t; | |
177 | else if (!cand) | |
178 | cand = t; | |
179 | } | |
180 | ||
181 | hash = ip_tunnel_hash(itn, key, 0); | |
182 | head = &itn->tunnels[hash]; | |
183 | ||
184 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
185 | if ((local != t->parms.iph.saddr && | |
186 | (local != t->parms.iph.daddr || | |
187 | !ipv4_is_multicast(local))) || | |
188 | !(t->dev->flags & IFF_UP)) | |
189 | continue; | |
190 | ||
191 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
192 | continue; | |
193 | ||
194 | if (t->parms.link == link) | |
195 | return t; | |
196 | else if (!cand) | |
197 | cand = t; | |
198 | } | |
199 | ||
200 | if (flags & TUNNEL_NO_KEY) | |
201 | goto skip_key_lookup; | |
202 | ||
203 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
204 | if (t->parms.i_key != key || | |
205 | !(t->dev->flags & IFF_UP)) | |
206 | continue; | |
207 | ||
208 | if (t->parms.link == link) | |
209 | return t; | |
210 | else if (!cand) | |
211 | cand = t; | |
212 | } | |
213 | ||
214 | skip_key_lookup: | |
215 | if (cand) | |
216 | return cand; | |
217 | ||
218 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) | |
219 | return netdev_priv(itn->fb_tunnel_dev); | |
220 | ||
221 | ||
222 | return NULL; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
225 | ||
226 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
227 | struct ip_tunnel_parm *parms) | |
228 | { | |
229 | unsigned int h; | |
230 | __be32 remote; | |
231 | ||
232 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
233 | remote = parms->iph.daddr; | |
234 | else | |
235 | remote = 0; | |
236 | ||
237 | h = ip_tunnel_hash(itn, parms->i_key, remote); | |
238 | return &itn->tunnels[h]; | |
239 | } | |
240 | ||
241 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
242 | { | |
243 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
244 | ||
245 | hlist_add_head_rcu(&t->hash_node, head); | |
246 | } | |
247 | ||
248 | static void ip_tunnel_del(struct ip_tunnel *t) | |
249 | { | |
250 | hlist_del_init_rcu(&t->hash_node); | |
251 | } | |
252 | ||
253 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
254 | struct ip_tunnel_parm *parms, | |
255 | int type) | |
256 | { | |
257 | __be32 remote = parms->iph.daddr; | |
258 | __be32 local = parms->iph.saddr; | |
259 | __be32 key = parms->i_key; | |
260 | int link = parms->link; | |
261 | struct ip_tunnel *t = NULL; | |
262 | struct hlist_head *head = ip_bucket(itn, parms); | |
263 | ||
264 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
265 | if (local == t->parms.iph.saddr && | |
266 | remote == t->parms.iph.daddr && | |
267 | key == t->parms.i_key && | |
268 | link == t->parms.link && | |
269 | type == t->dev->type) | |
270 | break; | |
271 | } | |
272 | return t; | |
273 | } | |
274 | ||
275 | static struct net_device *__ip_tunnel_create(struct net *net, | |
276 | const struct rtnl_link_ops *ops, | |
277 | struct ip_tunnel_parm *parms) | |
278 | { | |
279 | int err; | |
280 | struct ip_tunnel *tunnel; | |
281 | struct net_device *dev; | |
282 | char name[IFNAMSIZ]; | |
283 | ||
284 | if (parms->name[0]) | |
285 | strlcpy(name, parms->name, IFNAMSIZ); | |
286 | else { | |
54a5d382 | 287 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
c5441932 PS |
288 | err = -E2BIG; |
289 | goto failed; | |
290 | } | |
291 | strlcpy(name, ops->kind, IFNAMSIZ); | |
292 | strncat(name, "%d", 2); | |
293 | } | |
294 | ||
295 | ASSERT_RTNL(); | |
296 | dev = alloc_netdev(ops->priv_size, name, ops->setup); | |
297 | if (!dev) { | |
298 | err = -ENOMEM; | |
299 | goto failed; | |
300 | } | |
301 | dev_net_set(dev, net); | |
302 | ||
303 | dev->rtnl_link_ops = ops; | |
304 | ||
305 | tunnel = netdev_priv(dev); | |
306 | tunnel->parms = *parms; | |
5e6700b3 | 307 | tunnel->net = net; |
c5441932 PS |
308 | |
309 | err = register_netdevice(dev); | |
310 | if (err) | |
311 | goto failed_free; | |
312 | ||
313 | return dev; | |
314 | ||
315 | failed_free: | |
316 | free_netdev(dev); | |
317 | failed: | |
318 | return ERR_PTR(err); | |
319 | } | |
320 | ||
321 | static inline struct rtable *ip_route_output_tunnel(struct net *net, | |
322 | struct flowi4 *fl4, | |
323 | int proto, | |
324 | __be32 daddr, __be32 saddr, | |
325 | __be32 key, __u8 tos, int oif) | |
326 | { | |
327 | memset(fl4, 0, sizeof(*fl4)); | |
328 | fl4->flowi4_oif = oif; | |
329 | fl4->daddr = daddr; | |
330 | fl4->saddr = saddr; | |
331 | fl4->flowi4_tos = tos; | |
332 | fl4->flowi4_proto = proto; | |
333 | fl4->fl4_gre_key = key; | |
334 | return ip_route_output_key(net, fl4); | |
335 | } | |
336 | ||
337 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
338 | { | |
339 | struct net_device *tdev = NULL; | |
340 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
341 | const struct iphdr *iph; | |
342 | int hlen = LL_MAX_HEADER; | |
343 | int mtu = ETH_DATA_LEN; | |
344 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
345 | ||
346 | iph = &tunnel->parms.iph; | |
347 | ||
348 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
349 | if (iph->daddr) { | |
350 | struct flowi4 fl4; | |
351 | struct rtable *rt; | |
352 | ||
6c742e71 | 353 | rt = ip_route_output_tunnel(tunnel->net, &fl4, |
c5441932 PS |
354 | tunnel->parms.iph.protocol, |
355 | iph->daddr, iph->saddr, | |
356 | tunnel->parms.o_key, | |
357 | RT_TOS(iph->tos), | |
358 | tunnel->parms.link); | |
359 | if (!IS_ERR(rt)) { | |
360 | tdev = rt->dst.dev; | |
361 | ip_rt_put(rt); | |
362 | } | |
363 | if (dev->type != ARPHRD_ETHER) | |
364 | dev->flags |= IFF_POINTOPOINT; | |
365 | } | |
366 | ||
367 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 368 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
369 | |
370 | if (tdev) { | |
371 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
372 | mtu = tdev->mtu; | |
373 | } | |
374 | dev->iflink = tunnel->parms.link; | |
375 | ||
376 | dev->needed_headroom = t_hlen + hlen; | |
377 | mtu -= (dev->hard_header_len + t_hlen); | |
378 | ||
379 | if (mtu < 68) | |
380 | mtu = 68; | |
381 | ||
382 | return mtu; | |
383 | } | |
384 | ||
385 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
386 | struct ip_tunnel_net *itn, | |
387 | struct ip_tunnel_parm *parms) | |
388 | { | |
389 | struct ip_tunnel *nt, *fbt; | |
390 | struct net_device *dev; | |
391 | ||
392 | BUG_ON(!itn->fb_tunnel_dev); | |
393 | fbt = netdev_priv(itn->fb_tunnel_dev); | |
394 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); | |
395 | if (IS_ERR(dev)) | |
396 | return NULL; | |
397 | ||
398 | dev->mtu = ip_tunnel_bind_dev(dev); | |
399 | ||
400 | nt = netdev_priv(dev); | |
401 | ip_tunnel_add(itn, nt); | |
402 | return nt; | |
403 | } | |
404 | ||
405 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
406 | const struct tnl_ptk_info *tpi, bool log_ecn_error) | |
407 | { | |
408 | struct pcpu_tstats *tstats; | |
409 | const struct iphdr *iph = ip_hdr(skb); | |
410 | int err; | |
411 | ||
c5441932 PS |
412 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
413 | if (ipv4_is_multicast(iph->daddr)) { | |
414 | /* Looped back packet, drop it! */ | |
415 | if (rt_is_output_route(skb_rtable(skb))) | |
416 | goto drop; | |
417 | tunnel->dev->stats.multicast++; | |
418 | skb->pkt_type = PACKET_BROADCAST; | |
419 | } | |
420 | #endif | |
421 | ||
422 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
423 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
424 | tunnel->dev->stats.rx_crc_errors++; | |
425 | tunnel->dev->stats.rx_errors++; | |
426 | goto drop; | |
427 | } | |
428 | ||
429 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
430 | if (!(tpi->flags&TUNNEL_SEQ) || | |
431 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
432 | tunnel->dev->stats.rx_fifo_errors++; | |
433 | tunnel->dev->stats.rx_errors++; | |
434 | goto drop; | |
435 | } | |
436 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
437 | } | |
438 | ||
c5441932 PS |
439 | err = IP_ECN_decapsulate(iph, skb); |
440 | if (unlikely(err)) { | |
441 | if (log_ecn_error) | |
442 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
443 | &iph->saddr, iph->tos); | |
444 | if (err > 1) { | |
445 | ++tunnel->dev->stats.rx_frame_errors; | |
446 | ++tunnel->dev->stats.rx_errors; | |
447 | goto drop; | |
448 | } | |
449 | } | |
450 | ||
451 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
452 | u64_stats_update_begin(&tstats->syncp); | |
453 | tstats->rx_packets++; | |
454 | tstats->rx_bytes += skb->len; | |
455 | u64_stats_update_end(&tstats->syncp); | |
456 | ||
3d7b46cd PS |
457 | if (tunnel->dev->type == ARPHRD_ETHER) { |
458 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
459 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
460 | } else { | |
461 | skb->dev = tunnel->dev; | |
462 | } | |
64261f23 | 463 | |
ea23192e | 464 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
64261f23 | 465 | |
c5441932 PS |
466 | gro_cells_receive(&tunnel->gro_cells, skb); |
467 | return 0; | |
468 | ||
469 | drop: | |
470 | kfree_skb(skb); | |
471 | return 0; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
474 | ||
23a3647b PS |
475 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
476 | struct rtable *rt, __be16 df) | |
477 | { | |
478 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 479 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
480 | int mtu; |
481 | ||
482 | if (df) | |
483 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
484 | - sizeof(struct iphdr) - tunnel->hlen; | |
485 | else | |
486 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
487 | ||
488 | if (skb_dst(skb)) | |
489 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
490 | ||
491 | if (skb->protocol == htons(ETH_P_IP)) { | |
492 | if (!skb_is_gso(skb) && | |
493 | (df & htons(IP_DF)) && mtu < pkt_size) { | |
494 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
495 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
496 | return -E2BIG; | |
497 | } | |
498 | } | |
499 | #if IS_ENABLED(CONFIG_IPV6) | |
500 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
501 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
502 | ||
503 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
504 | mtu >= IPV6_MIN_MTU) { | |
505 | if ((tunnel->parms.iph.daddr && | |
506 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
507 | rt6->rt6i_dst.plen == 128) { | |
508 | rt6->rt6i_flags |= RTF_MODIFIED; | |
509 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
510 | } | |
511 | } | |
512 | ||
513 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
514 | mtu < pkt_size) { | |
515 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
516 | return -E2BIG; | |
517 | } | |
518 | } | |
519 | #endif | |
520 | return 0; | |
521 | } | |
522 | ||
c5441932 | 523 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
bf3d6a8f | 524 | const struct iphdr *tnl_params, const u8 protocol) |
c5441932 PS |
525 | { |
526 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
527 | const struct iphdr *inner_iph; | |
c5441932 PS |
528 | struct flowi4 fl4; |
529 | u8 tos, ttl; | |
530 | __be16 df; | |
531 | struct rtable *rt; /* Route to the other host */ | |
c5441932 PS |
532 | unsigned int max_headroom; /* The extra header space needed */ |
533 | __be32 dst; | |
0e6fbc5b | 534 | int err; |
c5441932 PS |
535 | |
536 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
537 | ||
538 | dst = tnl_params->daddr; | |
539 | if (dst == 0) { | |
540 | /* NBMA tunnel */ | |
541 | ||
542 | if (skb_dst(skb) == NULL) { | |
543 | dev->stats.tx_fifo_errors++; | |
544 | goto tx_error; | |
545 | } | |
546 | ||
547 | if (skb->protocol == htons(ETH_P_IP)) { | |
548 | rt = skb_rtable(skb); | |
549 | dst = rt_nexthop(rt, inner_iph->daddr); | |
550 | } | |
551 | #if IS_ENABLED(CONFIG_IPV6) | |
552 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
553 | const struct in6_addr *addr6; | |
554 | struct neighbour *neigh; | |
555 | bool do_tx_error_icmp; | |
556 | int addr_type; | |
557 | ||
558 | neigh = dst_neigh_lookup(skb_dst(skb), | |
559 | &ipv6_hdr(skb)->daddr); | |
560 | if (neigh == NULL) | |
561 | goto tx_error; | |
562 | ||
563 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
564 | addr_type = ipv6_addr_type(addr6); | |
565 | ||
566 | if (addr_type == IPV6_ADDR_ANY) { | |
567 | addr6 = &ipv6_hdr(skb)->daddr; | |
568 | addr_type = ipv6_addr_type(addr6); | |
569 | } | |
570 | ||
571 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
572 | do_tx_error_icmp = true; | |
573 | else { | |
574 | do_tx_error_icmp = false; | |
575 | dst = addr6->s6_addr32[3]; | |
576 | } | |
577 | neigh_release(neigh); | |
578 | if (do_tx_error_icmp) | |
579 | goto tx_error_icmp; | |
580 | } | |
581 | #endif | |
582 | else | |
583 | goto tx_error; | |
584 | } | |
585 | ||
586 | tos = tnl_params->tos; | |
587 | if (tos & 0x1) { | |
588 | tos &= ~0x1; | |
589 | if (skb->protocol == htons(ETH_P_IP)) | |
590 | tos = inner_iph->tos; | |
591 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
592 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
593 | } | |
594 | ||
5e6700b3 | 595 | rt = ip_route_output_tunnel(tunnel->net, &fl4, |
963b89e8 | 596 | protocol, |
c5441932 PS |
597 | dst, tnl_params->saddr, |
598 | tunnel->parms.o_key, | |
599 | RT_TOS(tos), | |
600 | tunnel->parms.link); | |
601 | if (IS_ERR(rt)) { | |
602 | dev->stats.tx_carrier_errors++; | |
603 | goto tx_error; | |
604 | } | |
0e6fbc5b | 605 | if (rt->dst.dev == dev) { |
c5441932 PS |
606 | ip_rt_put(rt); |
607 | dev->stats.collisions++; | |
608 | goto tx_error; | |
609 | } | |
c5441932 | 610 | |
23a3647b PS |
611 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) { |
612 | ip_rt_put(rt); | |
613 | goto tx_error; | |
c5441932 | 614 | } |
c5441932 PS |
615 | |
616 | if (tunnel->err_count > 0) { | |
617 | if (time_before(jiffies, | |
618 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
619 | tunnel->err_count--; | |
620 | ||
621 | dst_link_failure(skb); | |
622 | } else | |
623 | tunnel->err_count = 0; | |
624 | } | |
625 | ||
d4a71b15 | 626 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
627 | ttl = tnl_params->ttl; |
628 | if (ttl == 0) { | |
629 | if (skb->protocol == htons(ETH_P_IP)) | |
630 | ttl = inner_iph->ttl; | |
631 | #if IS_ENABLED(CONFIG_IPV6) | |
632 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
633 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
634 | #endif | |
635 | else | |
636 | ttl = ip4_dst_hoplimit(&rt->dst); | |
637 | } | |
638 | ||
23a3647b PS |
639 | df = tnl_params->frag_off; |
640 | if (skb->protocol == htons(ETH_P_IP)) | |
641 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
642 | ||
0e6fbc5b PS |
643 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
644 | + rt->dst.header_len; | |
3e08f4a7 | 645 | if (max_headroom > dev->needed_headroom) |
c5441932 | 646 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
647 | |
648 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
649 | dev->stats.tx_dropped++; | |
650 | dev_kfree_skb(skb); | |
651 | return; | |
c5441932 PS |
652 | } |
653 | ||
8b7ed2d9 | 654 | err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, protocol, |
d4a71b15 | 655 | tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
0e6fbc5b | 656 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
c5441932 | 657 | |
c5441932 PS |
658 | return; |
659 | ||
660 | #if IS_ENABLED(CONFIG_IPV6) | |
661 | tx_error_icmp: | |
662 | dst_link_failure(skb); | |
663 | #endif | |
664 | tx_error: | |
665 | dev->stats.tx_errors++; | |
666 | dev_kfree_skb(skb); | |
667 | } | |
668 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
669 | ||
670 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
671 | struct ip_tunnel *t, | |
672 | struct net_device *dev, | |
673 | struct ip_tunnel_parm *p, | |
674 | bool set_mtu) | |
675 | { | |
676 | ip_tunnel_del(t); | |
677 | t->parms.iph.saddr = p->iph.saddr; | |
678 | t->parms.iph.daddr = p->iph.daddr; | |
679 | t->parms.i_key = p->i_key; | |
680 | t->parms.o_key = p->o_key; | |
681 | if (dev->type != ARPHRD_ETHER) { | |
682 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
683 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
684 | } | |
685 | ip_tunnel_add(itn, t); | |
686 | ||
687 | t->parms.iph.ttl = p->iph.ttl; | |
688 | t->parms.iph.tos = p->iph.tos; | |
689 | t->parms.iph.frag_off = p->iph.frag_off; | |
690 | ||
691 | if (t->parms.link != p->link) { | |
692 | int mtu; | |
693 | ||
694 | t->parms.link = p->link; | |
695 | mtu = ip_tunnel_bind_dev(dev); | |
696 | if (set_mtu) | |
697 | dev->mtu = mtu; | |
698 | } | |
699 | netdev_state_change(dev); | |
700 | } | |
701 | ||
702 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
703 | { | |
704 | int err = 0; | |
705 | struct ip_tunnel *t; | |
706 | struct net *net = dev_net(dev); | |
707 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
708 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); | |
709 | ||
710 | BUG_ON(!itn->fb_tunnel_dev); | |
711 | switch (cmd) { | |
712 | case SIOCGETTUNNEL: | |
713 | t = NULL; | |
714 | if (dev == itn->fb_tunnel_dev) | |
715 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
716 | if (t == NULL) | |
717 | t = netdev_priv(dev); | |
718 | memcpy(p, &t->parms, sizeof(*p)); | |
719 | break; | |
720 | ||
721 | case SIOCADDTUNNEL: | |
722 | case SIOCCHGTUNNEL: | |
723 | err = -EPERM; | |
724 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
725 | goto done; | |
726 | if (p->iph.ttl) | |
727 | p->iph.frag_off |= htons(IP_DF); | |
728 | if (!(p->i_flags&TUNNEL_KEY)) | |
729 | p->i_key = 0; | |
730 | if (!(p->o_flags&TUNNEL_KEY)) | |
731 | p->o_key = 0; | |
732 | ||
733 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
734 | ||
735 | if (!t && (cmd == SIOCADDTUNNEL)) | |
736 | t = ip_tunnel_create(net, itn, p); | |
737 | ||
738 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
739 | if (t != NULL) { | |
740 | if (t->dev != dev) { | |
741 | err = -EEXIST; | |
742 | break; | |
743 | } | |
744 | } else { | |
745 | unsigned int nflags = 0; | |
746 | ||
747 | if (ipv4_is_multicast(p->iph.daddr)) | |
748 | nflags = IFF_BROADCAST; | |
749 | else if (p->iph.daddr) | |
750 | nflags = IFF_POINTOPOINT; | |
751 | ||
752 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
753 | err = -EINVAL; | |
754 | break; | |
755 | } | |
756 | ||
757 | t = netdev_priv(dev); | |
758 | } | |
759 | } | |
760 | ||
761 | if (t) { | |
762 | err = 0; | |
763 | ip_tunnel_update(itn, t, dev, p, true); | |
764 | } else | |
765 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
766 | break; | |
767 | ||
768 | case SIOCDELTUNNEL: | |
769 | err = -EPERM; | |
770 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
771 | goto done; | |
772 | ||
773 | if (dev == itn->fb_tunnel_dev) { | |
774 | err = -ENOENT; | |
775 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
776 | if (t == NULL) | |
777 | goto done; | |
778 | err = -EPERM; | |
779 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
780 | goto done; | |
781 | dev = t->dev; | |
782 | } | |
783 | unregister_netdevice(dev); | |
784 | err = 0; | |
785 | break; | |
786 | ||
787 | default: | |
788 | err = -EINVAL; | |
789 | } | |
790 | ||
791 | done: | |
792 | return err; | |
793 | } | |
794 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
795 | ||
796 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
797 | { | |
798 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
799 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
800 | ||
801 | if (new_mtu < 68 || | |
802 | new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen) | |
803 | return -EINVAL; | |
804 | dev->mtu = new_mtu; | |
805 | return 0; | |
806 | } | |
807 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); | |
808 | ||
809 | static void ip_tunnel_dev_free(struct net_device *dev) | |
810 | { | |
811 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
812 | ||
813 | gro_cells_destroy(&tunnel->gro_cells); | |
814 | free_percpu(dev->tstats); | |
815 | free_netdev(dev); | |
816 | } | |
817 | ||
818 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
819 | { | |
c5441932 PS |
820 | struct ip_tunnel *tunnel = netdev_priv(dev); |
821 | struct ip_tunnel_net *itn; | |
822 | ||
6c742e71 | 823 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
824 | |
825 | if (itn->fb_tunnel_dev != dev) { | |
826 | ip_tunnel_del(netdev_priv(dev)); | |
827 | unregister_netdevice_queue(dev, head); | |
828 | } | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
831 | ||
d3b6f614 | 832 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
833 | struct rtnl_link_ops *ops, char *devname) |
834 | { | |
835 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
836 | struct ip_tunnel_parm parms; | |
6261d983 | 837 | unsigned int i; |
c5441932 | 838 | |
6261d983 | 839 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
840 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
841 | |
842 | if (!ops) { | |
843 | itn->fb_tunnel_dev = NULL; | |
844 | return 0; | |
845 | } | |
6261d983 | 846 | |
c5441932 PS |
847 | memset(&parms, 0, sizeof(parms)); |
848 | if (devname) | |
849 | strlcpy(parms.name, devname, IFNAMSIZ); | |
850 | ||
851 | rtnl_lock(); | |
852 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
853 | /* FB netdevice is special: we have one, and only one per netns. |
854 | * Allowing to move it to another netns is clearly unsafe. | |
855 | */ | |
67013282 | 856 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 857 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
67013282 SK |
858 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
859 | } | |
b4de77ad | 860 | rtnl_unlock(); |
c5441932 | 861 | |
b4de77ad | 862 | return PTR_RET(itn->fb_tunnel_dev); |
c5441932 PS |
863 | } |
864 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
865 | ||
6c742e71 ND |
866 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
867 | struct rtnl_link_ops *ops) | |
c5441932 | 868 | { |
6c742e71 ND |
869 | struct net *net = dev_net(itn->fb_tunnel_dev); |
870 | struct net_device *dev, *aux; | |
c5441932 PS |
871 | int h; |
872 | ||
6c742e71 ND |
873 | for_each_netdev_safe(net, dev, aux) |
874 | if (dev->rtnl_link_ops == ops) | |
875 | unregister_netdevice_queue(dev, head); | |
876 | ||
c5441932 PS |
877 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
878 | struct ip_tunnel *t; | |
879 | struct hlist_node *n; | |
880 | struct hlist_head *thead = &itn->tunnels[h]; | |
881 | ||
882 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
883 | /* If dev is in the same netns, it has already |
884 | * been added to the list by the previous loop. | |
885 | */ | |
886 | if (!net_eq(dev_net(t->dev), net)) | |
887 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 888 | } |
c5441932 PS |
889 | } |
890 | ||
6c742e71 | 891 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
892 | { |
893 | LIST_HEAD(list); | |
894 | ||
895 | rtnl_lock(); | |
6c742e71 | 896 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
897 | unregister_netdevice_many(&list); |
898 | rtnl_unlock(); | |
c5441932 PS |
899 | } |
900 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
901 | ||
902 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
903 | struct ip_tunnel_parm *p) | |
904 | { | |
905 | struct ip_tunnel *nt; | |
906 | struct net *net = dev_net(dev); | |
907 | struct ip_tunnel_net *itn; | |
908 | int mtu; | |
909 | int err; | |
910 | ||
911 | nt = netdev_priv(dev); | |
912 | itn = net_generic(net, nt->ip_tnl_net_id); | |
913 | ||
914 | if (ip_tunnel_find(itn, p, dev->type)) | |
915 | return -EEXIST; | |
916 | ||
5e6700b3 | 917 | nt->net = net; |
c5441932 PS |
918 | nt->parms = *p; |
919 | err = register_netdevice(dev); | |
920 | if (err) | |
921 | goto out; | |
922 | ||
923 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
924 | eth_hw_addr_random(dev); | |
925 | ||
926 | mtu = ip_tunnel_bind_dev(dev); | |
927 | if (!tb[IFLA_MTU]) | |
928 | dev->mtu = mtu; | |
929 | ||
930 | ip_tunnel_add(itn, nt); | |
931 | ||
932 | out: | |
933 | return err; | |
934 | } | |
935 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
936 | ||
937 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
938 | struct ip_tunnel_parm *p) | |
939 | { | |
6c742e71 | 940 | struct ip_tunnel *t; |
c5441932 | 941 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 942 | struct net *net = tunnel->net; |
c5441932 PS |
943 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
944 | ||
945 | if (dev == itn->fb_tunnel_dev) | |
946 | return -EINVAL; | |
947 | ||
c5441932 PS |
948 | t = ip_tunnel_find(itn, p, dev->type); |
949 | ||
950 | if (t) { | |
951 | if (t->dev != dev) | |
952 | return -EEXIST; | |
953 | } else { | |
6c742e71 | 954 | t = tunnel; |
c5441932 PS |
955 | |
956 | if (dev->type != ARPHRD_ETHER) { | |
957 | unsigned int nflags = 0; | |
958 | ||
959 | if (ipv4_is_multicast(p->iph.daddr)) | |
960 | nflags = IFF_BROADCAST; | |
961 | else if (p->iph.daddr) | |
962 | nflags = IFF_POINTOPOINT; | |
963 | ||
964 | if ((dev->flags ^ nflags) & | |
965 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
966 | return -EINVAL; | |
967 | } | |
968 | } | |
969 | ||
970 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
971 | return 0; | |
972 | } | |
973 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
974 | ||
975 | int ip_tunnel_init(struct net_device *dev) | |
976 | { | |
977 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
978 | struct iphdr *iph = &tunnel->parms.iph; | |
979 | int err; | |
980 | ||
981 | dev->destructor = ip_tunnel_dev_free; | |
982 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
983 | if (!dev->tstats) | |
984 | return -ENOMEM; | |
985 | ||
986 | err = gro_cells_init(&tunnel->gro_cells, dev); | |
987 | if (err) { | |
988 | free_percpu(dev->tstats); | |
989 | return err; | |
990 | } | |
991 | ||
992 | tunnel->dev = dev; | |
6c742e71 | 993 | tunnel->net = dev_net(dev); |
c5441932 PS |
994 | strcpy(tunnel->parms.name, dev->name); |
995 | iph->version = 4; | |
996 | iph->ihl = 5; | |
997 | ||
998 | return 0; | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1001 | ||
1002 | void ip_tunnel_uninit(struct net_device *dev) | |
1003 | { | |
c5441932 | 1004 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1005 | struct net *net = tunnel->net; |
c5441932 PS |
1006 | struct ip_tunnel_net *itn; |
1007 | ||
1008 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1009 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1010 | if (itn->fb_tunnel_dev != dev) | |
1011 | ip_tunnel_del(netdev_priv(dev)); | |
1012 | } | |
1013 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1014 | ||
1015 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
1016 | void ip_tunnel_setup(struct net_device *dev, int net_id) | |
1017 | { | |
1018 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1019 | tunnel->ip_tnl_net_id = net_id; | |
1020 | } | |
1021 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1022 | ||
1023 | MODULE_LICENSE("GPL"); |