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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; | |
307 | ||
308 | err = register_netdevice(dev); | |
309 | if (err) | |
310 | goto failed_free; | |
311 | ||
312 | return dev; | |
313 | ||
314 | failed_free: | |
315 | free_netdev(dev); | |
316 | failed: | |
317 | return ERR_PTR(err); | |
318 | } | |
319 | ||
320 | static inline struct rtable *ip_route_output_tunnel(struct net *net, | |
321 | struct flowi4 *fl4, | |
322 | int proto, | |
323 | __be32 daddr, __be32 saddr, | |
324 | __be32 key, __u8 tos, int oif) | |
325 | { | |
326 | memset(fl4, 0, sizeof(*fl4)); | |
327 | fl4->flowi4_oif = oif; | |
328 | fl4->daddr = daddr; | |
329 | fl4->saddr = saddr; | |
330 | fl4->flowi4_tos = tos; | |
331 | fl4->flowi4_proto = proto; | |
332 | fl4->fl4_gre_key = key; | |
333 | return ip_route_output_key(net, fl4); | |
334 | } | |
335 | ||
336 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
337 | { | |
338 | struct net_device *tdev = NULL; | |
339 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
340 | const struct iphdr *iph; | |
341 | int hlen = LL_MAX_HEADER; | |
342 | int mtu = ETH_DATA_LEN; | |
343 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
344 | ||
345 | iph = &tunnel->parms.iph; | |
346 | ||
347 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
348 | if (iph->daddr) { | |
349 | struct flowi4 fl4; | |
350 | struct rtable *rt; | |
351 | ||
352 | rt = ip_route_output_tunnel(dev_net(dev), &fl4, | |
353 | tunnel->parms.iph.protocol, | |
354 | iph->daddr, iph->saddr, | |
355 | tunnel->parms.o_key, | |
356 | RT_TOS(iph->tos), | |
357 | tunnel->parms.link); | |
358 | if (!IS_ERR(rt)) { | |
359 | tdev = rt->dst.dev; | |
360 | ip_rt_put(rt); | |
361 | } | |
362 | if (dev->type != ARPHRD_ETHER) | |
363 | dev->flags |= IFF_POINTOPOINT; | |
364 | } | |
365 | ||
366 | if (!tdev && tunnel->parms.link) | |
367 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
368 | ||
369 | if (tdev) { | |
370 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
371 | mtu = tdev->mtu; | |
372 | } | |
373 | dev->iflink = tunnel->parms.link; | |
374 | ||
375 | dev->needed_headroom = t_hlen + hlen; | |
376 | mtu -= (dev->hard_header_len + t_hlen); | |
377 | ||
378 | if (mtu < 68) | |
379 | mtu = 68; | |
380 | ||
381 | return mtu; | |
382 | } | |
383 | ||
384 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
385 | struct ip_tunnel_net *itn, | |
386 | struct ip_tunnel_parm *parms) | |
387 | { | |
388 | struct ip_tunnel *nt, *fbt; | |
389 | struct net_device *dev; | |
390 | ||
391 | BUG_ON(!itn->fb_tunnel_dev); | |
392 | fbt = netdev_priv(itn->fb_tunnel_dev); | |
393 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); | |
394 | if (IS_ERR(dev)) | |
395 | return NULL; | |
396 | ||
397 | dev->mtu = ip_tunnel_bind_dev(dev); | |
398 | ||
399 | nt = netdev_priv(dev); | |
400 | ip_tunnel_add(itn, nt); | |
401 | return nt; | |
402 | } | |
403 | ||
404 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
405 | const struct tnl_ptk_info *tpi, bool log_ecn_error) | |
406 | { | |
407 | struct pcpu_tstats *tstats; | |
408 | const struct iphdr *iph = ip_hdr(skb); | |
409 | int err; | |
410 | ||
411 | secpath_reset(skb); | |
412 | ||
413 | skb->protocol = tpi->proto; | |
414 | ||
415 | skb->mac_header = skb->network_header; | |
416 | __pskb_pull(skb, tunnel->hlen); | |
417 | skb_postpull_rcsum(skb, skb_transport_header(skb), tunnel->hlen); | |
418 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
419 | if (ipv4_is_multicast(iph->daddr)) { | |
420 | /* Looped back packet, drop it! */ | |
421 | if (rt_is_output_route(skb_rtable(skb))) | |
422 | goto drop; | |
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 | ||
445 | /* Warning: All skb pointers will be invalidated! */ | |
446 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
447 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
448 | tunnel->dev->stats.rx_length_errors++; | |
449 | tunnel->dev->stats.rx_errors++; | |
450 | goto drop; | |
451 | } | |
452 | ||
453 | iph = ip_hdr(skb); | |
454 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
455 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
456 | } | |
457 | ||
458 | skb->pkt_type = PACKET_HOST; | |
459 | __skb_tunnel_rx(skb, tunnel->dev); | |
460 | ||
461 | skb_reset_network_header(skb); | |
462 | err = IP_ECN_decapsulate(iph, skb); | |
463 | if (unlikely(err)) { | |
464 | if (log_ecn_error) | |
465 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
466 | &iph->saddr, iph->tos); | |
467 | if (err > 1) { | |
468 | ++tunnel->dev->stats.rx_frame_errors; | |
469 | ++tunnel->dev->stats.rx_errors; | |
470 | goto drop; | |
471 | } | |
472 | } | |
473 | ||
474 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
475 | u64_stats_update_begin(&tstats->syncp); | |
476 | tstats->rx_packets++; | |
477 | tstats->rx_bytes += skb->len; | |
478 | u64_stats_update_end(&tstats->syncp); | |
479 | ||
480 | gro_cells_receive(&tunnel->gro_cells, skb); | |
481 | return 0; | |
482 | ||
483 | drop: | |
484 | kfree_skb(skb); | |
485 | return 0; | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
488 | ||
489 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
490 | const struct iphdr *tnl_params) | |
491 | { | |
492 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
493 | const struct iphdr *inner_iph; | |
494 | struct iphdr *iph; | |
495 | struct flowi4 fl4; | |
496 | u8 tos, ttl; | |
497 | __be16 df; | |
498 | struct rtable *rt; /* Route to the other host */ | |
499 | struct net_device *tdev; /* Device to other host */ | |
500 | unsigned int max_headroom; /* The extra header space needed */ | |
501 | __be32 dst; | |
502 | int mtu; | |
503 | ||
504 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
505 | ||
a6222602 | 506 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
c5441932 PS |
507 | dst = tnl_params->daddr; |
508 | if (dst == 0) { | |
509 | /* NBMA tunnel */ | |
510 | ||
511 | if (skb_dst(skb) == NULL) { | |
512 | dev->stats.tx_fifo_errors++; | |
513 | goto tx_error; | |
514 | } | |
515 | ||
516 | if (skb->protocol == htons(ETH_P_IP)) { | |
517 | rt = skb_rtable(skb); | |
518 | dst = rt_nexthop(rt, inner_iph->daddr); | |
519 | } | |
520 | #if IS_ENABLED(CONFIG_IPV6) | |
521 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
522 | const struct in6_addr *addr6; | |
523 | struct neighbour *neigh; | |
524 | bool do_tx_error_icmp; | |
525 | int addr_type; | |
526 | ||
527 | neigh = dst_neigh_lookup(skb_dst(skb), | |
528 | &ipv6_hdr(skb)->daddr); | |
529 | if (neigh == NULL) | |
530 | goto tx_error; | |
531 | ||
532 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
533 | addr_type = ipv6_addr_type(addr6); | |
534 | ||
535 | if (addr_type == IPV6_ADDR_ANY) { | |
536 | addr6 = &ipv6_hdr(skb)->daddr; | |
537 | addr_type = ipv6_addr_type(addr6); | |
538 | } | |
539 | ||
540 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
541 | do_tx_error_icmp = true; | |
542 | else { | |
543 | do_tx_error_icmp = false; | |
544 | dst = addr6->s6_addr32[3]; | |
545 | } | |
546 | neigh_release(neigh); | |
547 | if (do_tx_error_icmp) | |
548 | goto tx_error_icmp; | |
549 | } | |
550 | #endif | |
551 | else | |
552 | goto tx_error; | |
553 | } | |
554 | ||
555 | tos = tnl_params->tos; | |
556 | if (tos & 0x1) { | |
557 | tos &= ~0x1; | |
558 | if (skb->protocol == htons(ETH_P_IP)) | |
559 | tos = inner_iph->tos; | |
560 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
561 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
562 | } | |
563 | ||
564 | rt = ip_route_output_tunnel(dev_net(dev), &fl4, | |
565 | tunnel->parms.iph.protocol, | |
566 | dst, tnl_params->saddr, | |
567 | tunnel->parms.o_key, | |
568 | RT_TOS(tos), | |
569 | tunnel->parms.link); | |
570 | if (IS_ERR(rt)) { | |
571 | dev->stats.tx_carrier_errors++; | |
572 | goto tx_error; | |
573 | } | |
574 | tdev = rt->dst.dev; | |
575 | ||
576 | if (tdev == dev) { | |
577 | ip_rt_put(rt); | |
578 | dev->stats.collisions++; | |
579 | goto tx_error; | |
580 | } | |
581 | ||
582 | df = tnl_params->frag_off; | |
583 | ||
584 | if (df) | |
585 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
586 | - sizeof(struct iphdr); | |
587 | else | |
588 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
589 | ||
590 | if (skb_dst(skb)) | |
591 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
592 | ||
593 | if (skb->protocol == htons(ETH_P_IP)) { | |
594 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
595 | ||
596 | if (!skb_is_gso(skb) && | |
597 | (inner_iph->frag_off&htons(IP_DF)) && | |
598 | mtu < ntohs(inner_iph->tot_len)) { | |
599 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
600 | ip_rt_put(rt); | |
601 | goto tx_error; | |
602 | } | |
603 | } | |
604 | #if IS_ENABLED(CONFIG_IPV6) | |
605 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
606 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
607 | ||
608 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
609 | mtu >= IPV6_MIN_MTU) { | |
610 | if ((tunnel->parms.iph.daddr && | |
611 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
612 | rt6->rt6i_dst.plen == 128) { | |
613 | rt6->rt6i_flags |= RTF_MODIFIED; | |
614 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
615 | } | |
616 | } | |
617 | ||
618 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
619 | mtu < skb->len) { | |
620 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
621 | ip_rt_put(rt); | |
622 | goto tx_error; | |
623 | } | |
624 | } | |
625 | #endif | |
626 | ||
627 | if (tunnel->err_count > 0) { | |
628 | if (time_before(jiffies, | |
629 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
630 | tunnel->err_count--; | |
631 | ||
632 | dst_link_failure(skb); | |
633 | } else | |
634 | tunnel->err_count = 0; | |
635 | } | |
636 | ||
637 | ttl = tnl_params->ttl; | |
638 | if (ttl == 0) { | |
639 | if (skb->protocol == htons(ETH_P_IP)) | |
640 | ttl = inner_iph->ttl; | |
641 | #if IS_ENABLED(CONFIG_IPV6) | |
642 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
643 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
644 | #endif | |
645 | else | |
646 | ttl = ip4_dst_hoplimit(&rt->dst); | |
647 | } | |
648 | ||
649 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr) | |
650 | + rt->dst.header_len; | |
651 | if (max_headroom > dev->needed_headroom) { | |
652 | dev->needed_headroom = max_headroom; | |
653 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
654 | dev->stats.tx_dropped++; | |
655 | dev_kfree_skb(skb); | |
656 | return; | |
657 | } | |
658 | } | |
659 | ||
660 | skb_dst_drop(skb); | |
661 | skb_dst_set(skb, &rt->dst); | |
c5441932 PS |
662 | |
663 | /* Push down and install the IP header. */ | |
664 | skb_push(skb, sizeof(struct iphdr)); | |
665 | skb_reset_network_header(skb); | |
666 | ||
667 | iph = ip_hdr(skb); | |
668 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
669 | ||
670 | iph->version = 4; | |
671 | iph->ihl = sizeof(struct iphdr) >> 2; | |
672 | iph->frag_off = df; | |
673 | iph->protocol = tnl_params->protocol; | |
674 | iph->tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); | |
675 | iph->daddr = fl4.daddr; | |
676 | iph->saddr = fl4.saddr; | |
677 | iph->ttl = ttl; | |
678 | tunnel_ip_select_ident(skb, inner_iph, &rt->dst); | |
679 | ||
680 | iptunnel_xmit(skb, dev); | |
681 | return; | |
682 | ||
683 | #if IS_ENABLED(CONFIG_IPV6) | |
684 | tx_error_icmp: | |
685 | dst_link_failure(skb); | |
686 | #endif | |
687 | tx_error: | |
688 | dev->stats.tx_errors++; | |
689 | dev_kfree_skb(skb); | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
692 | ||
693 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
694 | struct ip_tunnel *t, | |
695 | struct net_device *dev, | |
696 | struct ip_tunnel_parm *p, | |
697 | bool set_mtu) | |
698 | { | |
699 | ip_tunnel_del(t); | |
700 | t->parms.iph.saddr = p->iph.saddr; | |
701 | t->parms.iph.daddr = p->iph.daddr; | |
702 | t->parms.i_key = p->i_key; | |
703 | t->parms.o_key = p->o_key; | |
704 | if (dev->type != ARPHRD_ETHER) { | |
705 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
706 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
707 | } | |
708 | ip_tunnel_add(itn, t); | |
709 | ||
710 | t->parms.iph.ttl = p->iph.ttl; | |
711 | t->parms.iph.tos = p->iph.tos; | |
712 | t->parms.iph.frag_off = p->iph.frag_off; | |
713 | ||
714 | if (t->parms.link != p->link) { | |
715 | int mtu; | |
716 | ||
717 | t->parms.link = p->link; | |
718 | mtu = ip_tunnel_bind_dev(dev); | |
719 | if (set_mtu) | |
720 | dev->mtu = mtu; | |
721 | } | |
722 | netdev_state_change(dev); | |
723 | } | |
724 | ||
725 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
726 | { | |
727 | int err = 0; | |
728 | struct ip_tunnel *t; | |
729 | struct net *net = dev_net(dev); | |
730 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
731 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); | |
732 | ||
733 | BUG_ON(!itn->fb_tunnel_dev); | |
734 | switch (cmd) { | |
735 | case SIOCGETTUNNEL: | |
736 | t = NULL; | |
737 | if (dev == itn->fb_tunnel_dev) | |
738 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
739 | if (t == NULL) | |
740 | t = netdev_priv(dev); | |
741 | memcpy(p, &t->parms, sizeof(*p)); | |
742 | break; | |
743 | ||
744 | case SIOCADDTUNNEL: | |
745 | case SIOCCHGTUNNEL: | |
746 | err = -EPERM; | |
747 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
748 | goto done; | |
749 | if (p->iph.ttl) | |
750 | p->iph.frag_off |= htons(IP_DF); | |
751 | if (!(p->i_flags&TUNNEL_KEY)) | |
752 | p->i_key = 0; | |
753 | if (!(p->o_flags&TUNNEL_KEY)) | |
754 | p->o_key = 0; | |
755 | ||
756 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
757 | ||
758 | if (!t && (cmd == SIOCADDTUNNEL)) | |
759 | t = ip_tunnel_create(net, itn, p); | |
760 | ||
761 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
762 | if (t != NULL) { | |
763 | if (t->dev != dev) { | |
764 | err = -EEXIST; | |
765 | break; | |
766 | } | |
767 | } else { | |
768 | unsigned int nflags = 0; | |
769 | ||
770 | if (ipv4_is_multicast(p->iph.daddr)) | |
771 | nflags = IFF_BROADCAST; | |
772 | else if (p->iph.daddr) | |
773 | nflags = IFF_POINTOPOINT; | |
774 | ||
775 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
776 | err = -EINVAL; | |
777 | break; | |
778 | } | |
779 | ||
780 | t = netdev_priv(dev); | |
781 | } | |
782 | } | |
783 | ||
784 | if (t) { | |
785 | err = 0; | |
786 | ip_tunnel_update(itn, t, dev, p, true); | |
787 | } else | |
788 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
789 | break; | |
790 | ||
791 | case SIOCDELTUNNEL: | |
792 | err = -EPERM; | |
793 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
794 | goto done; | |
795 | ||
796 | if (dev == itn->fb_tunnel_dev) { | |
797 | err = -ENOENT; | |
798 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
799 | if (t == NULL) | |
800 | goto done; | |
801 | err = -EPERM; | |
802 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
803 | goto done; | |
804 | dev = t->dev; | |
805 | } | |
806 | unregister_netdevice(dev); | |
807 | err = 0; | |
808 | break; | |
809 | ||
810 | default: | |
811 | err = -EINVAL; | |
812 | } | |
813 | ||
814 | done: | |
815 | return err; | |
816 | } | |
817 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
818 | ||
819 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
820 | { | |
821 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
822 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
823 | ||
824 | if (new_mtu < 68 || | |
825 | new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen) | |
826 | return -EINVAL; | |
827 | dev->mtu = new_mtu; | |
828 | return 0; | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); | |
831 | ||
832 | static void ip_tunnel_dev_free(struct net_device *dev) | |
833 | { | |
834 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
835 | ||
836 | gro_cells_destroy(&tunnel->gro_cells); | |
837 | free_percpu(dev->tstats); | |
838 | free_netdev(dev); | |
839 | } | |
840 | ||
841 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
842 | { | |
843 | struct net *net = dev_net(dev); | |
844 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
845 | struct ip_tunnel_net *itn; | |
846 | ||
847 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
848 | ||
849 | if (itn->fb_tunnel_dev != dev) { | |
850 | ip_tunnel_del(netdev_priv(dev)); | |
851 | unregister_netdevice_queue(dev, head); | |
852 | } | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
855 | ||
d3b6f614 | 856 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
857 | struct rtnl_link_ops *ops, char *devname) |
858 | { | |
859 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
860 | struct ip_tunnel_parm parms; | |
861 | ||
862 | itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL); | |
863 | if (!itn->tunnels) | |
864 | return -ENOMEM; | |
865 | ||
866 | if (!ops) { | |
867 | itn->fb_tunnel_dev = NULL; | |
868 | return 0; | |
869 | } | |
870 | memset(&parms, 0, sizeof(parms)); | |
871 | if (devname) | |
872 | strlcpy(parms.name, devname, IFNAMSIZ); | |
873 | ||
874 | rtnl_lock(); | |
875 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
876 | rtnl_unlock(); | |
877 | if (IS_ERR(itn->fb_tunnel_dev)) { | |
878 | kfree(itn->tunnels); | |
879 | return PTR_ERR(itn->fb_tunnel_dev); | |
880 | } | |
881 | ||
882 | return 0; | |
883 | } | |
884 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
885 | ||
886 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head) | |
887 | { | |
888 | int h; | |
889 | ||
890 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { | |
891 | struct ip_tunnel *t; | |
892 | struct hlist_node *n; | |
893 | struct hlist_head *thead = &itn->tunnels[h]; | |
894 | ||
895 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
896 | unregister_netdevice_queue(t->dev, head); | |
897 | } | |
898 | if (itn->fb_tunnel_dev) | |
899 | unregister_netdevice_queue(itn->fb_tunnel_dev, head); | |
900 | } | |
901 | ||
d3b6f614 | 902 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn) |
c5441932 PS |
903 | { |
904 | LIST_HEAD(list); | |
905 | ||
906 | rtnl_lock(); | |
907 | ip_tunnel_destroy(itn, &list); | |
908 | unregister_netdevice_many(&list); | |
909 | rtnl_unlock(); | |
910 | kfree(itn->tunnels); | |
911 | } | |
912 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
913 | ||
914 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
915 | struct ip_tunnel_parm *p) | |
916 | { | |
917 | struct ip_tunnel *nt; | |
918 | struct net *net = dev_net(dev); | |
919 | struct ip_tunnel_net *itn; | |
920 | int mtu; | |
921 | int err; | |
922 | ||
923 | nt = netdev_priv(dev); | |
924 | itn = net_generic(net, nt->ip_tnl_net_id); | |
925 | ||
926 | if (ip_tunnel_find(itn, p, dev->type)) | |
927 | return -EEXIST; | |
928 | ||
929 | nt->parms = *p; | |
930 | err = register_netdevice(dev); | |
931 | if (err) | |
932 | goto out; | |
933 | ||
934 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
935 | eth_hw_addr_random(dev); | |
936 | ||
937 | mtu = ip_tunnel_bind_dev(dev); | |
938 | if (!tb[IFLA_MTU]) | |
939 | dev->mtu = mtu; | |
940 | ||
941 | ip_tunnel_add(itn, nt); | |
942 | ||
943 | out: | |
944 | return err; | |
945 | } | |
946 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
947 | ||
948 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
949 | struct ip_tunnel_parm *p) | |
950 | { | |
951 | struct ip_tunnel *t, *nt; | |
952 | struct net *net = dev_net(dev); | |
953 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
954 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); | |
955 | ||
956 | if (dev == itn->fb_tunnel_dev) | |
957 | return -EINVAL; | |
958 | ||
959 | nt = netdev_priv(dev); | |
960 | ||
961 | t = ip_tunnel_find(itn, p, dev->type); | |
962 | ||
963 | if (t) { | |
964 | if (t->dev != dev) | |
965 | return -EEXIST; | |
966 | } else { | |
967 | t = nt; | |
968 | ||
969 | if (dev->type != ARPHRD_ETHER) { | |
970 | unsigned int nflags = 0; | |
971 | ||
972 | if (ipv4_is_multicast(p->iph.daddr)) | |
973 | nflags = IFF_BROADCAST; | |
974 | else if (p->iph.daddr) | |
975 | nflags = IFF_POINTOPOINT; | |
976 | ||
977 | if ((dev->flags ^ nflags) & | |
978 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
979 | return -EINVAL; | |
980 | } | |
981 | } | |
982 | ||
983 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
984 | return 0; | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
987 | ||
988 | int ip_tunnel_init(struct net_device *dev) | |
989 | { | |
990 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
991 | struct iphdr *iph = &tunnel->parms.iph; | |
992 | int err; | |
993 | ||
994 | dev->destructor = ip_tunnel_dev_free; | |
995 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
996 | if (!dev->tstats) | |
997 | return -ENOMEM; | |
998 | ||
999 | err = gro_cells_init(&tunnel->gro_cells, dev); | |
1000 | if (err) { | |
1001 | free_percpu(dev->tstats); | |
1002 | return err; | |
1003 | } | |
1004 | ||
1005 | tunnel->dev = dev; | |
1006 | strcpy(tunnel->parms.name, dev->name); | |
1007 | iph->version = 4; | |
1008 | iph->ihl = 5; | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1013 | ||
1014 | void ip_tunnel_uninit(struct net_device *dev) | |
1015 | { | |
1016 | struct net *net = dev_net(dev); | |
1017 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1018 | struct ip_tunnel_net *itn; | |
1019 | ||
1020 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1021 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1022 | if (itn->fb_tunnel_dev != dev) | |
1023 | ip_tunnel_del(netdev_priv(dev)); | |
1024 | } | |
1025 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1026 | ||
1027 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
1028 | void ip_tunnel_setup(struct net_device *dev, int net_id) | |
1029 | { | |
1030 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1031 | tunnel->ip_tnl_net_id = net_id; | |
1032 | } | |
1033 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1034 | ||
1035 | MODULE_LICENSE("GPL"); |