Commit | Line | Data |
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1da177e4 | 1 | /* |
e905a9ed | 2 | * Linux NET3: GRE over IP protocol decoder. |
1da177e4 LT |
3 | * |
4 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
afd46503 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/types.h> | |
1da177e4 | 18 | #include <linux/kernel.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <asm/uaccess.h> |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/tcp.h> | |
25 | #include <linux/udp.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/mroute.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/inetdevice.h> | |
31 | #include <linux/igmp.h> | |
32 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 33 | #include <linux/etherdevice.h> |
46f25dff | 34 | #include <linux/if_ether.h> |
1da177e4 LT |
35 | |
36 | #include <net/sock.h> | |
37 | #include <net/ip.h> | |
38 | #include <net/icmp.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/ipip.h> | |
41 | #include <net/arp.h> | |
42 | #include <net/checksum.h> | |
43 | #include <net/dsfield.h> | |
44 | #include <net/inet_ecn.h> | |
45 | #include <net/xfrm.h> | |
59a4c759 PE |
46 | #include <net/net_namespace.h> |
47 | #include <net/netns/generic.h> | |
c19e654d | 48 | #include <net/rtnetlink.h> |
00959ade | 49 | #include <net/gre.h> |
1da177e4 | 50 | |
dfd56b8b | 51 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
52 | #include <net/ipv6.h> |
53 | #include <net/ip6_fib.h> | |
54 | #include <net/ip6_route.h> | |
55 | #endif | |
56 | ||
57 | /* | |
58 | Problems & solutions | |
59 | -------------------- | |
60 | ||
61 | 1. The most important issue is detecting local dead loops. | |
62 | They would cause complete host lockup in transmit, which | |
63 | would be "resolved" by stack overflow or, if queueing is enabled, | |
64 | with infinite looping in net_bh. | |
65 | ||
66 | We cannot track such dead loops during route installation, | |
67 | it is infeasible task. The most general solutions would be | |
68 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 69 | and silently drop packet when it expires. It is a good |
bff52857 | 70 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
71 | skb, even if no tunneling is used. |
72 | ||
6d0722a2 ED |
73 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
74 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
75 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
76 | |
77 | 2. Networking dead loops would not kill routers, but would really | |
78 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
79 | if we copy it from packet being encapsulated to upper header. | |
80 | It is very good solution, but it introduces two problems: | |
81 | ||
82 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
83 | do not work over tunnels. | |
84 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
85 | so that this problem would be solved and traceroute output | |
86 | would even more informative. This idea appeared to be wrong: | |
87 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
88 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
89 | return only 8 bytes of payload. It is the end. | |
90 | ||
91 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
92 | we should search for another solution. | |
93 | ||
94 | One of them is to parse packet trying to detect inner encapsulation | |
95 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 96 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
97 | |
98 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
99 | We force DF flag on tunnels with preconfigured hop limit, | |
100 | that is ALL. :-) Well, it does not remove the problem completely, | |
101 | but exponential growth of network traffic is changed to linear | |
102 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 103 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
104 | Yes, it is not good if there exists a router in the loop, |
105 | which does not force DF, even when encapsulating packets have DF set. | |
106 | But it is not our problem! Nobody could accuse us, we made | |
107 | all that we could make. Even if it is your gated who injected | |
108 | fatal route to network, even if it were you who configured | |
109 | fatal static route: you are innocent. :-) | |
110 | ||
111 | ||
112 | ||
113 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain | |
114 | practically identical code. It would be good to glue them | |
115 | together, but it is not very evident, how to make them modular. | |
116 | sit is integral part of IPv6, ipip and gre are naturally modular. | |
117 | We could extract common parts (hash table, ioctl etc) | |
118 | to a separate module (ip_tunnel.c). | |
119 | ||
120 | Alexey Kuznetsov. | |
121 | */ | |
122 | ||
c19e654d | 123 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 LT |
124 | static int ipgre_tunnel_init(struct net_device *dev); |
125 | static void ipgre_tunnel_setup(struct net_device *dev); | |
42aa9162 | 126 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
1da177e4 LT |
127 | |
128 | /* Fallback tunnel: no source, no destination, no key, no options */ | |
129 | ||
eb8ce741 PE |
130 | #define HASH_SIZE 16 |
131 | ||
f99189b1 | 132 | static int ipgre_net_id __read_mostly; |
59a4c759 | 133 | struct ipgre_net { |
1507850b | 134 | struct ip_tunnel __rcu *tunnels[4][HASH_SIZE]; |
eb8ce741 | 135 | |
7daa0004 | 136 | struct net_device *fb_tunnel_dev; |
59a4c759 PE |
137 | }; |
138 | ||
1da177e4 LT |
139 | /* Tunnel hash table */ |
140 | ||
141 | /* | |
142 | 4 hash tables: | |
143 | ||
144 | 3: (remote,local) | |
145 | 2: (remote,*) | |
146 | 1: (*,local) | |
147 | 0: (*,*) | |
148 | ||
149 | We require exact key match i.e. if a key is present in packet | |
150 | it will match only tunnel with the same key; if it is not present, | |
151 | it will match only keyless tunnel. | |
152 | ||
153 | All keysless packets, if not matched configured keyless tunnels | |
154 | will match fallback tunnel. | |
155 | */ | |
156 | ||
d5a0a1e3 | 157 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 158 | |
eb8ce741 PE |
159 | #define tunnels_r_l tunnels[3] |
160 | #define tunnels_r tunnels[2] | |
161 | #define tunnels_l tunnels[1] | |
162 | #define tunnels_wc tunnels[0] | |
8d5b2c08 | 163 | /* |
1507850b | 164 | * Locking : hash tables are protected by RCU and RTNL |
8d5b2c08 | 165 | */ |
1da177e4 | 166 | |
8d5b2c08 ED |
167 | #define for_each_ip_tunnel_rcu(start) \ |
168 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 169 | |
e985aad7 ED |
170 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
171 | struct pcpu_tstats { | |
87b6d218 | 172 | u64 rx_packets; |
173 | u64 rx_bytes; | |
174 | u64 tx_packets; | |
175 | u64 tx_bytes; | |
176 | struct u64_stats_sync syncp; | |
177 | }; | |
e985aad7 | 178 | |
87b6d218 | 179 | static struct rtnl_link_stats64 *ipgre_get_stats64(struct net_device *dev, |
180 | struct rtnl_link_stats64 *tot) | |
e985aad7 | 181 | { |
e985aad7 ED |
182 | int i; |
183 | ||
184 | for_each_possible_cpu(i) { | |
185 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 186 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
187 | unsigned int start; | |
188 | ||
189 | do { | |
190 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
191 | rx_packets = tstats->rx_packets; | |
192 | tx_packets = tstats->tx_packets; | |
193 | rx_bytes = tstats->rx_bytes; | |
194 | tx_bytes = tstats->tx_bytes; | |
195 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
196 | ||
197 | tot->rx_packets += rx_packets; | |
198 | tot->tx_packets += tx_packets; | |
199 | tot->rx_bytes += rx_bytes; | |
200 | tot->tx_bytes += tx_bytes; | |
e985aad7 | 201 | } |
87b6d218 | 202 | |
203 | tot->multicast = dev->stats.multicast; | |
204 | tot->rx_crc_errors = dev->stats.rx_crc_errors; | |
205 | tot->rx_fifo_errors = dev->stats.rx_fifo_errors; | |
206 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
207 | tot->rx_errors = dev->stats.rx_errors; | |
208 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
209 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
210 | tot->tx_dropped = dev->stats.tx_dropped; | |
211 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
212 | tot->tx_errors = dev->stats.tx_errors; | |
213 | ||
214 | return tot; | |
e985aad7 ED |
215 | } |
216 | ||
1da177e4 LT |
217 | /* Given src, dst and key, find appropriate for input tunnel. */ |
218 | ||
5e73ea1a DB |
219 | static struct ip_tunnel *ipgre_tunnel_lookup(struct net_device *dev, |
220 | __be32 remote, __be32 local, | |
221 | __be32 key, __be16 gre_proto) | |
1da177e4 | 222 | { |
749c10f9 TT |
223 | struct net *net = dev_net(dev); |
224 | int link = dev->ifindex; | |
1507850b ED |
225 | unsigned int h0 = HASH(remote); |
226 | unsigned int h1 = HASH(key); | |
afcf1242 | 227 | struct ip_tunnel *t, *cand = NULL; |
7daa0004 | 228 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
229 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
230 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
afcf1242 | 231 | int score, cand_score = 4; |
1da177e4 | 232 | |
8d5b2c08 | 233 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
749c10f9 TT |
234 | if (local != t->parms.iph.saddr || |
235 | remote != t->parms.iph.daddr || | |
236 | key != t->parms.i_key || | |
237 | !(t->dev->flags & IFF_UP)) | |
238 | continue; | |
239 | ||
240 | if (t->dev->type != ARPHRD_IPGRE && | |
241 | t->dev->type != dev_type) | |
242 | continue; | |
243 | ||
afcf1242 | 244 | score = 0; |
749c10f9 | 245 | if (t->parms.link != link) |
afcf1242 | 246 | score |= 1; |
749c10f9 | 247 | if (t->dev->type != dev_type) |
afcf1242 TT |
248 | score |= 2; |
249 | if (score == 0) | |
749c10f9 | 250 | return t; |
afcf1242 TT |
251 | |
252 | if (score < cand_score) { | |
253 | cand = t; | |
254 | cand_score = score; | |
255 | } | |
1da177e4 | 256 | } |
e1a80002 | 257 | |
8d5b2c08 | 258 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
749c10f9 TT |
259 | if (remote != t->parms.iph.daddr || |
260 | key != t->parms.i_key || | |
261 | !(t->dev->flags & IFF_UP)) | |
262 | continue; | |
263 | ||
264 | if (t->dev->type != ARPHRD_IPGRE && | |
265 | t->dev->type != dev_type) | |
266 | continue; | |
267 | ||
afcf1242 | 268 | score = 0; |
749c10f9 | 269 | if (t->parms.link != link) |
afcf1242 | 270 | score |= 1; |
749c10f9 | 271 | if (t->dev->type != dev_type) |
afcf1242 TT |
272 | score |= 2; |
273 | if (score == 0) | |
749c10f9 | 274 | return t; |
afcf1242 TT |
275 | |
276 | if (score < cand_score) { | |
277 | cand = t; | |
278 | cand_score = score; | |
279 | } | |
1da177e4 | 280 | } |
e1a80002 | 281 | |
8d5b2c08 | 282 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
749c10f9 TT |
283 | if ((local != t->parms.iph.saddr && |
284 | (local != t->parms.iph.daddr || | |
285 | !ipv4_is_multicast(local))) || | |
286 | key != t->parms.i_key || | |
287 | !(t->dev->flags & IFF_UP)) | |
288 | continue; | |
289 | ||
290 | if (t->dev->type != ARPHRD_IPGRE && | |
291 | t->dev->type != dev_type) | |
292 | continue; | |
293 | ||
afcf1242 | 294 | score = 0; |
749c10f9 | 295 | if (t->parms.link != link) |
afcf1242 | 296 | score |= 1; |
749c10f9 | 297 | if (t->dev->type != dev_type) |
afcf1242 TT |
298 | score |= 2; |
299 | if (score == 0) | |
749c10f9 | 300 | return t; |
afcf1242 TT |
301 | |
302 | if (score < cand_score) { | |
303 | cand = t; | |
304 | cand_score = score; | |
305 | } | |
1da177e4 | 306 | } |
e1a80002 | 307 | |
8d5b2c08 | 308 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
749c10f9 TT |
309 | if (t->parms.i_key != key || |
310 | !(t->dev->flags & IFF_UP)) | |
311 | continue; | |
312 | ||
313 | if (t->dev->type != ARPHRD_IPGRE && | |
314 | t->dev->type != dev_type) | |
315 | continue; | |
316 | ||
afcf1242 | 317 | score = 0; |
749c10f9 | 318 | if (t->parms.link != link) |
afcf1242 | 319 | score |= 1; |
749c10f9 | 320 | if (t->dev->type != dev_type) |
afcf1242 TT |
321 | score |= 2; |
322 | if (score == 0) | |
749c10f9 | 323 | return t; |
afcf1242 TT |
324 | |
325 | if (score < cand_score) { | |
326 | cand = t; | |
327 | cand_score = score; | |
328 | } | |
1da177e4 LT |
329 | } |
330 | ||
afcf1242 TT |
331 | if (cand != NULL) |
332 | return cand; | |
e1a80002 | 333 | |
8d5b2c08 ED |
334 | dev = ign->fb_tunnel_dev; |
335 | if (dev->flags & IFF_UP) | |
336 | return netdev_priv(dev); | |
749c10f9 | 337 | |
1da177e4 LT |
338 | return NULL; |
339 | } | |
340 | ||
1507850b | 341 | static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 342 | struct ip_tunnel_parm *parms) |
1da177e4 | 343 | { |
5056a1ef YH |
344 | __be32 remote = parms->iph.daddr; |
345 | __be32 local = parms->iph.saddr; | |
346 | __be32 key = parms->i_key; | |
1507850b | 347 | unsigned int h = HASH(key); |
1da177e4 LT |
348 | int prio = 0; |
349 | ||
350 | if (local) | |
351 | prio |= 1; | |
f97c1e0c | 352 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
353 | prio |= 2; |
354 | h ^= HASH(remote); | |
355 | } | |
356 | ||
eb8ce741 | 357 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
358 | } |
359 | ||
1507850b | 360 | static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 361 | struct ip_tunnel *t) |
5056a1ef | 362 | { |
f57e7d5a | 363 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
364 | } |
365 | ||
f57e7d5a | 366 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 367 | { |
1507850b | 368 | struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t); |
1da177e4 | 369 | |
1507850b | 370 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
8d5b2c08 | 371 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
372 | } |
373 | ||
f57e7d5a | 374 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 375 | { |
1507850b ED |
376 | struct ip_tunnel __rcu **tp; |
377 | struct ip_tunnel *iter; | |
378 | ||
379 | for (tp = ipgre_bucket(ign, t); | |
380 | (iter = rtnl_dereference(*tp)) != NULL; | |
381 | tp = &iter->next) { | |
382 | if (t == iter) { | |
383 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
384 | break; |
385 | } | |
386 | } | |
387 | } | |
388 | ||
e1a80002 HX |
389 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
390 | struct ip_tunnel_parm *parms, | |
391 | int type) | |
1da177e4 | 392 | { |
d5a0a1e3 AV |
393 | __be32 remote = parms->iph.daddr; |
394 | __be32 local = parms->iph.saddr; | |
395 | __be32 key = parms->i_key; | |
749c10f9 | 396 | int link = parms->link; |
1507850b ED |
397 | struct ip_tunnel *t; |
398 | struct ip_tunnel __rcu **tp; | |
e1a80002 HX |
399 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
400 | ||
1507850b ED |
401 | for (tp = __ipgre_bucket(ign, parms); |
402 | (t = rtnl_dereference(*tp)) != NULL; | |
403 | tp = &t->next) | |
e1a80002 HX |
404 | if (local == t->parms.iph.saddr && |
405 | remote == t->parms.iph.daddr && | |
406 | key == t->parms.i_key && | |
749c10f9 | 407 | link == t->parms.link && |
e1a80002 HX |
408 | type == t->dev->type) |
409 | break; | |
410 | ||
411 | return t; | |
412 | } | |
413 | ||
1507850b | 414 | static struct ip_tunnel *ipgre_tunnel_locate(struct net *net, |
e1a80002 HX |
415 | struct ip_tunnel_parm *parms, int create) |
416 | { | |
417 | struct ip_tunnel *t, *nt; | |
1da177e4 | 418 | struct net_device *dev; |
1da177e4 | 419 | char name[IFNAMSIZ]; |
f57e7d5a | 420 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 421 | |
e1a80002 HX |
422 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
423 | if (t || !create) | |
424 | return t; | |
1da177e4 LT |
425 | |
426 | if (parms->name[0]) | |
427 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 428 | else |
407d6fcb | 429 | strcpy(name, "gre%d"); |
1da177e4 LT |
430 | |
431 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
432 | if (!dev) | |
407d6fcb | 433 | return NULL; |
1da177e4 | 434 | |
0b67eceb PE |
435 | dev_net_set(dev, net); |
436 | ||
2941a486 | 437 | nt = netdev_priv(dev); |
1da177e4 | 438 | nt->parms = *parms; |
c19e654d | 439 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 440 | |
42aa9162 HX |
441 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
442 | ||
b37d428b PE |
443 | if (register_netdevice(dev) < 0) |
444 | goto failed_free; | |
1da177e4 | 445 | |
f2b3ee9e WB |
446 | /* Can use a lockless transmit, unless we generate output sequences */ |
447 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
448 | dev->features |= NETIF_F_LLTX; | |
449 | ||
1da177e4 | 450 | dev_hold(dev); |
f57e7d5a | 451 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
452 | return nt; |
453 | ||
b37d428b PE |
454 | failed_free: |
455 | free_netdev(dev); | |
1da177e4 LT |
456 | return NULL; |
457 | } | |
458 | ||
459 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
460 | { | |
f57e7d5a PE |
461 | struct net *net = dev_net(dev); |
462 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
463 | ||
464 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
465 | dev_put(dev); |
466 | } | |
467 | ||
468 | ||
469 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
470 | { | |
1da177e4 | 471 | |
071f92d0 | 472 | /* All the routers (except for Linux) return only |
1da177e4 LT |
473 | 8 bytes of packet payload. It means, that precise relaying of |
474 | ICMP in the real Internet is absolutely infeasible. | |
475 | ||
476 | Moreover, Cisco "wise men" put GRE key to the third word | |
477 | in GRE header. It makes impossible maintaining even soft state for keyed | |
478 | GRE tunnels with enabled checksum. Tell them "thank you". | |
479 | ||
480 | Well, I wonder, rfc1812 was written by Cisco employee, | |
bff52857 | 481 | what the hell these idiots break standards established |
482 | by themselves??? | |
1da177e4 LT |
483 | */ |
484 | ||
b71d1d42 | 485 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
5e73ea1a | 486 | __be16 *p = (__be16 *)(skb->data+(iph->ihl<<2)); |
1da177e4 | 487 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
488 | const int type = icmp_hdr(skb)->type; |
489 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 490 | struct ip_tunnel *t; |
d5a0a1e3 | 491 | __be16 flags; |
1da177e4 LT |
492 | |
493 | flags = p[0]; | |
494 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
495 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
496 | return; | |
497 | if (flags&GRE_KEY) { | |
498 | grehlen += 4; | |
499 | if (flags&GRE_CSUM) | |
500 | grehlen += 4; | |
501 | } | |
502 | } | |
503 | ||
504 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
505 | if (skb_headlen(skb) < grehlen) | |
506 | return; | |
507 | ||
508 | switch (type) { | |
509 | default: | |
510 | case ICMP_PARAMETERPROB: | |
511 | return; | |
512 | ||
513 | case ICMP_DEST_UNREACH: | |
514 | switch (code) { | |
515 | case ICMP_SR_FAILED: | |
516 | case ICMP_PORT_UNREACH: | |
517 | /* Impossible event. */ | |
518 | return; | |
1da177e4 LT |
519 | default: |
520 | /* All others are translated to HOST_UNREACH. | |
521 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
522 | I believe they are just ether pollution. --ANK | |
523 | */ | |
524 | break; | |
525 | } | |
526 | break; | |
527 | case ICMP_TIME_EXCEEDED: | |
528 | if (code != ICMP_EXC_TTL) | |
529 | return; | |
530 | break; | |
531 | } | |
532 | ||
8d5b2c08 | 533 | rcu_read_lock(); |
749c10f9 | 534 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
535 | flags & GRE_KEY ? |
536 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
537 | p[1]); | |
36393395 DM |
538 | if (t == NULL) |
539 | goto out; | |
540 | ||
541 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
542 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
543 | t->parms.link, 0, IPPROTO_GRE, 0); | |
544 | goto out; | |
545 | } | |
546 | ||
547 | if (t->parms.iph.daddr == 0 || | |
f97c1e0c | 548 | ipv4_is_multicast(t->parms.iph.daddr)) |
1da177e4 LT |
549 | goto out; |
550 | ||
551 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
552 | goto out; | |
553 | ||
da6185d8 | 554 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
555 | t->err_count++; |
556 | else | |
557 | t->err_count = 1; | |
558 | t->err_time = jiffies; | |
559 | out: | |
8d5b2c08 | 560 | rcu_read_unlock(); |
1da177e4 LT |
561 | } |
562 | ||
b71d1d42 | 563 | static inline void ipgre_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
564 | { |
565 | if (INET_ECN_is_ce(iph->tos)) { | |
566 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 567 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 568 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 569 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
570 | } |
571 | } | |
572 | } | |
573 | ||
574 | static inline u8 | |
b71d1d42 | 575 | ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb) |
1da177e4 LT |
576 | { |
577 | u8 inner = 0; | |
578 | if (skb->protocol == htons(ETH_P_IP)) | |
579 | inner = old_iph->tos; | |
580 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
b71d1d42 | 581 | inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
582 | return INET_ECN_encapsulate(tos, inner); |
583 | } | |
584 | ||
585 | static int ipgre_rcv(struct sk_buff *skb) | |
586 | { | |
b71d1d42 | 587 | const struct iphdr *iph; |
1da177e4 | 588 | u8 *h; |
d5a0a1e3 | 589 | __be16 flags; |
d3bc23e7 | 590 | __sum16 csum = 0; |
d5a0a1e3 | 591 | __be32 key = 0; |
1da177e4 LT |
592 | u32 seqno = 0; |
593 | struct ip_tunnel *tunnel; | |
594 | int offset = 4; | |
e1a80002 | 595 | __be16 gre_proto; |
1da177e4 LT |
596 | |
597 | if (!pskb_may_pull(skb, 16)) | |
598 | goto drop_nolock; | |
599 | ||
eddc9ec5 | 600 | iph = ip_hdr(skb); |
1da177e4 | 601 | h = skb->data; |
5e73ea1a | 602 | flags = *(__be16 *)h; |
1da177e4 LT |
603 | |
604 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
605 | /* - Version must be 0. | |
606 | - We do not support routing headers. | |
607 | */ | |
608 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
609 | goto drop_nolock; | |
610 | ||
611 | if (flags&GRE_CSUM) { | |
fb286bb2 | 612 | switch (skb->ip_summed) { |
84fa7933 | 613 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 614 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
615 | if (!csum) |
616 | break; | |
617 | /* fall through */ | |
618 | case CHECKSUM_NONE: | |
619 | skb->csum = 0; | |
620 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 621 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
622 | } |
623 | offset += 4; | |
624 | } | |
625 | if (flags&GRE_KEY) { | |
5e73ea1a | 626 | key = *(__be32 *)(h + offset); |
1da177e4 LT |
627 | offset += 4; |
628 | } | |
629 | if (flags&GRE_SEQ) { | |
5e73ea1a | 630 | seqno = ntohl(*(__be32 *)(h + offset)); |
1da177e4 LT |
631 | offset += 4; |
632 | } | |
633 | } | |
634 | ||
e1a80002 HX |
635 | gre_proto = *(__be16 *)(h + 2); |
636 | ||
8d5b2c08 | 637 | rcu_read_lock(); |
749c10f9 | 638 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
639 | iph->saddr, iph->daddr, key, |
640 | gre_proto))) { | |
e985aad7 | 641 | struct pcpu_tstats *tstats; |
addd68eb | 642 | |
1da177e4 LT |
643 | secpath_reset(skb); |
644 | ||
e1a80002 | 645 | skb->protocol = gre_proto; |
1da177e4 LT |
646 | /* WCCP version 1 and 2 protocol decoding. |
647 | * - Change protocol to IP | |
648 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
649 | */ | |
e1a80002 | 650 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 651 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 652 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
653 | offset += 4; |
654 | } | |
655 | ||
1d069167 | 656 | skb->mac_header = skb->network_header; |
4209fb60 | 657 | __pskb_pull(skb, offset); |
9c70220b | 658 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
659 | skb->pkt_type = PACKET_HOST; |
660 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 661 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 662 | /* Looped back packet, drop it! */ |
c7537967 | 663 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 664 | goto drop; |
e985aad7 | 665 | tunnel->dev->stats.multicast++; |
1da177e4 LT |
666 | skb->pkt_type = PACKET_BROADCAST; |
667 | } | |
668 | #endif | |
669 | ||
670 | if (((flags&GRE_CSUM) && csum) || | |
671 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
e985aad7 ED |
672 | tunnel->dev->stats.rx_crc_errors++; |
673 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
674 | goto drop; |
675 | } | |
676 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
677 | if (!(flags&GRE_SEQ) || | |
678 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
e985aad7 ED |
679 | tunnel->dev->stats.rx_fifo_errors++; |
680 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
681 | goto drop; |
682 | } | |
683 | tunnel->i_seqno = seqno + 1; | |
684 | } | |
e1a80002 HX |
685 | |
686 | /* Warning: All skb pointers will be invalidated! */ | |
687 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
688 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
e985aad7 ED |
689 | tunnel->dev->stats.rx_length_errors++; |
690 | tunnel->dev->stats.rx_errors++; | |
e1a80002 HX |
691 | goto drop; |
692 | } | |
693 | ||
694 | iph = ip_hdr(skb); | |
695 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
696 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
697 | } | |
698 | ||
e985aad7 | 699 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
87b6d218 | 700 | u64_stats_update_begin(&tstats->syncp); |
e985aad7 ED |
701 | tstats->rx_packets++; |
702 | tstats->rx_bytes += skb->len; | |
87b6d218 | 703 | u64_stats_update_end(&tstats->syncp); |
e985aad7 ED |
704 | |
705 | __skb_tunnel_rx(skb, tunnel->dev); | |
e1a80002 HX |
706 | |
707 | skb_reset_network_header(skb); | |
1da177e4 | 708 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 709 | |
caf586e5 | 710 | netif_rx(skb); |
8990f468 | 711 | |
8d5b2c08 | 712 | rcu_read_unlock(); |
8990f468 | 713 | return 0; |
1da177e4 | 714 | } |
45af08be | 715 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
716 | |
717 | drop: | |
8d5b2c08 | 718 | rcu_read_unlock(); |
1da177e4 LT |
719 | drop_nolock: |
720 | kfree_skb(skb); | |
a02cec21 | 721 | return 0; |
1da177e4 LT |
722 | } |
723 | ||
6fef4c0c | 724 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 725 | { |
2941a486 | 726 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e985aad7 | 727 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
728 | const struct iphdr *old_iph = ip_hdr(skb); |
729 | const struct iphdr *tiph; | |
cbb1e85f | 730 | struct flowi4 fl4; |
1da177e4 | 731 | u8 tos; |
d5a0a1e3 | 732 | __be16 df; |
1da177e4 | 733 | struct rtable *rt; /* Route to the other host */ |
1507850b | 734 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 735 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 736 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 737 | int gre_hlen; |
d5a0a1e3 | 738 | __be32 dst; |
1da177e4 LT |
739 | int mtu; |
740 | ||
e1a80002 HX |
741 | if (dev->type == ARPHRD_ETHER) |
742 | IPCB(skb)->flags = 0; | |
743 | ||
744 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 745 | gre_hlen = 0; |
b71d1d42 | 746 | tiph = (const struct iphdr *)skb->data; |
1da177e4 LT |
747 | } else { |
748 | gre_hlen = tunnel->hlen; | |
749 | tiph = &tunnel->parms.iph; | |
750 | } | |
751 | ||
752 | if ((dst = tiph->daddr) == 0) { | |
753 | /* NBMA tunnel */ | |
754 | ||
adf30907 | 755 | if (skb_dst(skb) == NULL) { |
e985aad7 | 756 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
757 | goto tx_error; |
758 | } | |
759 | ||
61d57f87 | 760 | if (skb->protocol == htons(ETH_P_IP)) { |
511c3f92 | 761 | rt = skb_rtable(skb); |
61d57f87 DM |
762 | dst = rt->rt_gateway; |
763 | } | |
dfd56b8b | 764 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 765 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
b71d1d42 | 766 | const struct in6_addr *addr6; |
0ec88662 DM |
767 | struct neighbour *neigh; |
768 | bool do_tx_error_icmp; | |
1da177e4 | 769 | int addr_type; |
1da177e4 | 770 | |
0ec88662 | 771 | neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
772 | if (neigh == NULL) |
773 | goto tx_error; | |
774 | ||
b71d1d42 | 775 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
776 | addr_type = ipv6_addr_type(addr6); |
777 | ||
778 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 779 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
780 | addr_type = ipv6_addr_type(addr6); |
781 | } | |
782 | ||
783 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
0ec88662 DM |
784 | do_tx_error_icmp = true; |
785 | else { | |
786 | do_tx_error_icmp = false; | |
787 | dst = addr6->s6_addr32[3]; | |
788 | } | |
789 | neigh_release(neigh); | |
790 | if (do_tx_error_icmp) | |
1da177e4 | 791 | goto tx_error_icmp; |
1da177e4 LT |
792 | } |
793 | #endif | |
794 | else | |
795 | goto tx_error; | |
796 | } | |
797 | ||
798 | tos = tiph->tos; | |
ee686ca9 AJ |
799 | if (tos == 1) { |
800 | tos = 0; | |
1da177e4 LT |
801 | if (skb->protocol == htons(ETH_P_IP)) |
802 | tos = old_iph->tos; | |
dd4ba83d | 803 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 804 | tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
805 | } |
806 | ||
cbb1e85f | 807 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr, |
78fbfd8a DM |
808 | tunnel->parms.o_key, RT_TOS(tos), |
809 | tunnel->parms.link); | |
810 | if (IS_ERR(rt)) { | |
811 | dev->stats.tx_carrier_errors++; | |
812 | goto tx_error; | |
1da177e4 | 813 | } |
d8d1f30b | 814 | tdev = rt->dst.dev; |
1da177e4 LT |
815 | |
816 | if (tdev == dev) { | |
817 | ip_rt_put(rt); | |
e985aad7 | 818 | dev->stats.collisions++; |
1da177e4 LT |
819 | goto tx_error; |
820 | } | |
821 | ||
822 | df = tiph->frag_off; | |
823 | if (df) | |
d8d1f30b | 824 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 | 825 | else |
adf30907 | 826 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 | 827 | |
adf30907 ED |
828 | if (skb_dst(skb)) |
829 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
830 | |
831 | if (skb->protocol == htons(ETH_P_IP)) { | |
832 | df |= (old_iph->frag_off&htons(IP_DF)); | |
833 | ||
834 | if ((old_iph->frag_off&htons(IP_DF)) && | |
835 | mtu < ntohs(old_iph->tot_len)) { | |
836 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
837 | ip_rt_put(rt); | |
838 | goto tx_error; | |
839 | } | |
840 | } | |
dfd56b8b | 841 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 842 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
adf30907 | 843 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
1da177e4 | 844 | |
adf30907 | 845 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
f97c1e0c JP |
846 | if ((tunnel->parms.iph.daddr && |
847 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
848 | rt6->rt6i_dst.plen == 128) { |
849 | rt6->rt6i_flags |= RTF_MODIFIED; | |
defb3519 | 850 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); |
1da177e4 LT |
851 | } |
852 | } | |
853 | ||
854 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
3ffe533c | 855 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1da177e4 LT |
856 | ip_rt_put(rt); |
857 | goto tx_error; | |
858 | } | |
859 | } | |
860 | #endif | |
861 | ||
862 | if (tunnel->err_count > 0) { | |
da6185d8 WY |
863 | if (time_before(jiffies, |
864 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
865 | tunnel->err_count--; |
866 | ||
867 | dst_link_failure(skb); | |
868 | } else | |
869 | tunnel->err_count = 0; | |
870 | } | |
871 | ||
d8d1f30b | 872 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
1da177e4 | 873 | |
cfbba49d PM |
874 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
875 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 876 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
805dc1d6 HX |
877 | if (max_headroom > dev->needed_headroom) |
878 | dev->needed_headroom = max_headroom; | |
1da177e4 LT |
879 | if (!new_skb) { |
880 | ip_rt_put(rt); | |
e985aad7 | 881 | dev->stats.tx_dropped++; |
1da177e4 | 882 | dev_kfree_skb(skb); |
6ed10654 | 883 | return NETDEV_TX_OK; |
1da177e4 LT |
884 | } |
885 | if (skb->sk) | |
886 | skb_set_owner_w(new_skb, skb->sk); | |
887 | dev_kfree_skb(skb); | |
888 | skb = new_skb; | |
eddc9ec5 | 889 | old_iph = ip_hdr(skb); |
1da177e4 LT |
890 | } |
891 | ||
64194c31 | 892 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
893 | skb_push(skb, gre_hlen); |
894 | skb_reset_network_header(skb); | |
1da177e4 | 895 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
896 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
897 | IPSKB_REROUTED); | |
adf30907 | 898 | skb_dst_drop(skb); |
d8d1f30b | 899 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
900 | |
901 | /* | |
902 | * Push down and install the IPIP header. | |
903 | */ | |
904 | ||
eddc9ec5 | 905 | iph = ip_hdr(skb); |
1da177e4 LT |
906 | iph->version = 4; |
907 | iph->ihl = sizeof(struct iphdr) >> 2; | |
908 | iph->frag_off = df; | |
909 | iph->protocol = IPPROTO_GRE; | |
910 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
cbb1e85f DM |
911 | iph->daddr = fl4.daddr; |
912 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
913 | |
914 | if ((iph->ttl = tiph->ttl) == 0) { | |
915 | if (skb->protocol == htons(ETH_P_IP)) | |
916 | iph->ttl = old_iph->ttl; | |
dfd56b8b | 917 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 918 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 919 | iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
920 | #endif |
921 | else | |
323e126f | 922 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
1da177e4 LT |
923 | } |
924 | ||
e1a80002 HX |
925 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
926 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
927 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
928 | |
929 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
5e73ea1a | 930 | __be32 *ptr = (__be32 *)(((u8 *)iph) + tunnel->hlen - 4); |
1da177e4 LT |
931 | |
932 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
933 | ++tunnel->o_seqno; | |
934 | *ptr = htonl(tunnel->o_seqno); | |
935 | ptr--; | |
936 | } | |
937 | if (tunnel->parms.o_flags&GRE_KEY) { | |
938 | *ptr = tunnel->parms.o_key; | |
939 | ptr--; | |
940 | } | |
941 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
942 | *ptr = 0; | |
5e73ea1a | 943 | *(__sum16 *)ptr = ip_compute_csum((void *)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
944 | } |
945 | } | |
946 | ||
947 | nf_reset(skb); | |
e985aad7 ED |
948 | tstats = this_cpu_ptr(dev->tstats); |
949 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 950 | return NETDEV_TX_OK; |
1da177e4 | 951 | |
496053f4 | 952 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
953 | tx_error_icmp: |
954 | dst_link_failure(skb); | |
496053f4 | 955 | #endif |
1da177e4 | 956 | tx_error: |
e985aad7 | 957 | dev->stats.tx_errors++; |
1da177e4 | 958 | dev_kfree_skb(skb); |
6ed10654 | 959 | return NETDEV_TX_OK; |
1da177e4 LT |
960 | } |
961 | ||
42aa9162 | 962 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
963 | { |
964 | struct net_device *tdev = NULL; | |
965 | struct ip_tunnel *tunnel; | |
b71d1d42 | 966 | const struct iphdr *iph; |
ee34c1eb MS |
967 | int hlen = LL_MAX_HEADER; |
968 | int mtu = ETH_DATA_LEN; | |
969 | int addend = sizeof(struct iphdr) + 4; | |
970 | ||
971 | tunnel = netdev_priv(dev); | |
972 | iph = &tunnel->parms.iph; | |
973 | ||
c95b819a | 974 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
975 | |
976 | if (iph->daddr) { | |
cbb1e85f DM |
977 | struct flowi4 fl4; |
978 | struct rtable *rt; | |
979 | ||
980 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
981 | iph->daddr, iph->saddr, | |
982 | tunnel->parms.o_key, | |
983 | RT_TOS(iph->tos), | |
984 | tunnel->parms.link); | |
b23dd4fe | 985 | if (!IS_ERR(rt)) { |
d8d1f30b | 986 | tdev = rt->dst.dev; |
ee34c1eb MS |
987 | ip_rt_put(rt); |
988 | } | |
e1a80002 HX |
989 | |
990 | if (dev->type != ARPHRD_ETHER) | |
991 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
992 | } |
993 | ||
994 | if (!tdev && tunnel->parms.link) | |
96635522 | 995 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
996 | |
997 | if (tdev) { | |
c95b819a | 998 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
999 | mtu = tdev->mtu; |
1000 | } | |
1001 | dev->iflink = tunnel->parms.link; | |
1002 | ||
1003 | /* Precalculate GRE options length */ | |
1004 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
1005 | if (tunnel->parms.o_flags&GRE_CSUM) | |
1006 | addend += 4; | |
1007 | if (tunnel->parms.o_flags&GRE_KEY) | |
1008 | addend += 4; | |
1009 | if (tunnel->parms.o_flags&GRE_SEQ) | |
1010 | addend += 4; | |
1011 | } | |
c95b819a | 1012 | dev->needed_headroom = addend + hlen; |
8cdb0456 | 1013 | mtu -= dev->hard_header_len + addend; |
42aa9162 HX |
1014 | |
1015 | if (mtu < 68) | |
1016 | mtu = 68; | |
1017 | ||
ee34c1eb MS |
1018 | tunnel->hlen = addend; |
1019 | ||
42aa9162 | 1020 | return mtu; |
ee34c1eb MS |
1021 | } |
1022 | ||
1da177e4 LT |
1023 | static int |
1024 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
1025 | { | |
1026 | int err = 0; | |
1027 | struct ip_tunnel_parm p; | |
1028 | struct ip_tunnel *t; | |
f57e7d5a PE |
1029 | struct net *net = dev_net(dev); |
1030 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
1031 | |
1032 | switch (cmd) { | |
1033 | case SIOCGETTUNNEL: | |
1034 | t = NULL; | |
7daa0004 | 1035 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1036 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1037 | err = -EFAULT; | |
1038 | break; | |
1039 | } | |
f57e7d5a | 1040 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
1041 | } |
1042 | if (t == NULL) | |
2941a486 | 1043 | t = netdev_priv(dev); |
1da177e4 LT |
1044 | memcpy(&p, &t->parms, sizeof(p)); |
1045 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1046 | err = -EFAULT; | |
1047 | break; | |
1048 | ||
1049 | case SIOCADDTUNNEL: | |
1050 | case SIOCCHGTUNNEL: | |
1051 | err = -EPERM; | |
1052 | if (!capable(CAP_NET_ADMIN)) | |
1053 | goto done; | |
1054 | ||
1055 | err = -EFAULT; | |
1056 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1057 | goto done; | |
1058 | ||
1059 | err = -EINVAL; | |
1060 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
1061 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
1062 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
1063 | goto done; | |
1064 | if (p.iph.ttl) | |
1065 | p.iph.frag_off |= htons(IP_DF); | |
1066 | ||
1067 | if (!(p.i_flags&GRE_KEY)) | |
1068 | p.i_key = 0; | |
1069 | if (!(p.o_flags&GRE_KEY)) | |
1070 | p.o_key = 0; | |
1071 | ||
f57e7d5a | 1072 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1073 | |
7daa0004 | 1074 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1075 | if (t != NULL) { |
1076 | if (t->dev != dev) { | |
1077 | err = -EEXIST; | |
1078 | break; | |
1079 | } | |
1080 | } else { | |
1507850b | 1081 | unsigned int nflags = 0; |
1da177e4 | 1082 | |
2941a486 | 1083 | t = netdev_priv(dev); |
1da177e4 | 1084 | |
f97c1e0c | 1085 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1086 | nflags = IFF_BROADCAST; |
1087 | else if (p.iph.daddr) | |
1088 | nflags = IFF_POINTOPOINT; | |
1089 | ||
1090 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1091 | err = -EINVAL; | |
1092 | break; | |
1093 | } | |
f57e7d5a | 1094 | ipgre_tunnel_unlink(ign, t); |
74b0b85b | 1095 | synchronize_net(); |
1da177e4 LT |
1096 | t->parms.iph.saddr = p.iph.saddr; |
1097 | t->parms.iph.daddr = p.iph.daddr; | |
1098 | t->parms.i_key = p.i_key; | |
1099 | t->parms.o_key = p.o_key; | |
1100 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1101 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1102 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1103 | netdev_state_change(dev); |
1104 | } | |
1105 | } | |
1106 | ||
1107 | if (t) { | |
1108 | err = 0; | |
1109 | if (cmd == SIOCCHGTUNNEL) { | |
1110 | t->parms.iph.ttl = p.iph.ttl; | |
1111 | t->parms.iph.tos = p.iph.tos; | |
1112 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1113 | if (t->parms.link != p.link) { |
1114 | t->parms.link = p.link; | |
42aa9162 | 1115 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1116 | netdev_state_change(dev); |
1117 | } | |
1da177e4 LT |
1118 | } |
1119 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1120 | err = -EFAULT; | |
1121 | } else | |
1122 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1123 | break; | |
1124 | ||
1125 | case SIOCDELTUNNEL: | |
1126 | err = -EPERM; | |
1127 | if (!capable(CAP_NET_ADMIN)) | |
1128 | goto done; | |
1129 | ||
7daa0004 | 1130 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1131 | err = -EFAULT; |
1132 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1133 | goto done; | |
1134 | err = -ENOENT; | |
f57e7d5a | 1135 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1136 | goto done; |
1137 | err = -EPERM; | |
7daa0004 | 1138 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1139 | goto done; |
1140 | dev = t->dev; | |
1141 | } | |
22f8cde5 SH |
1142 | unregister_netdevice(dev); |
1143 | err = 0; | |
1da177e4 LT |
1144 | break; |
1145 | ||
1146 | default: | |
1147 | err = -EINVAL; | |
1148 | } | |
1149 | ||
1150 | done: | |
1151 | return err; | |
1152 | } | |
1153 | ||
1da177e4 LT |
1154 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1155 | { | |
2941a486 | 1156 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1157 | if (new_mtu < 68 || |
1158 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1159 | return -EINVAL; |
1160 | dev->mtu = new_mtu; | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1da177e4 LT |
1164 | /* Nice toy. Unfortunately, useless in real life :-) |
1165 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1166 | over the Internet, provided multicast routing is tuned. | |
1167 | ||
1168 | ||
1169 | I have no idea was this bicycle invented before me, | |
1170 | so that I had to set ARPHRD_IPGRE to a random value. | |
1171 | I have an impression, that Cisco could make something similar, | |
1172 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1173 | |
1da177e4 LT |
1174 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1175 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1176 | ||
1177 | ping -t 255 224.66.66.66 | |
1178 | ||
1179 | If nobody answers, mbone does not work. | |
1180 | ||
1181 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1182 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1183 | ifconfig Universe up | |
1184 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1185 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1186 | ftp 10.66.66.66 | |
1187 | ... | |
1188 | ftp fec0:6666:6666::193.233.7.65 | |
1189 | ... | |
1190 | ||
1191 | */ | |
1192 | ||
3b04ddde SH |
1193 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1194 | unsigned short type, | |
1507850b | 1195 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 1196 | { |
2941a486 | 1197 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1198 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
5e73ea1a | 1199 | __be16 *p = (__be16 *)(iph+1); |
1da177e4 LT |
1200 | |
1201 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1202 | p[0] = t->parms.o_flags; | |
1203 | p[1] = htons(type); | |
1204 | ||
1205 | /* | |
e905a9ed | 1206 | * Set the source hardware address. |
1da177e4 | 1207 | */ |
e905a9ed | 1208 | |
1da177e4 LT |
1209 | if (saddr) |
1210 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 1211 | if (daddr) |
1da177e4 | 1212 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 1213 | if (iph->daddr) |
1da177e4 | 1214 | return t->hlen; |
e905a9ed | 1215 | |
1da177e4 LT |
1216 | return -t->hlen; |
1217 | } | |
1218 | ||
6a5f44d7 TT |
1219 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1220 | { | |
b71d1d42 | 1221 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1222 | memcpy(haddr, &iph->saddr, 4); |
1223 | return 4; | |
1224 | } | |
1225 | ||
3b04ddde SH |
1226 | static const struct header_ops ipgre_header_ops = { |
1227 | .create = ipgre_header, | |
6a5f44d7 | 1228 | .parse = ipgre_header_parse, |
3b04ddde SH |
1229 | }; |
1230 | ||
6a5f44d7 | 1231 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1232 | static int ipgre_open(struct net_device *dev) |
1233 | { | |
2941a486 | 1234 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1235 | |
f97c1e0c | 1236 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
1237 | struct flowi4 fl4; |
1238 | struct rtable *rt; | |
1239 | ||
1240 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
1241 | t->parms.iph.daddr, | |
1242 | t->parms.iph.saddr, | |
1243 | t->parms.o_key, | |
1244 | RT_TOS(t->parms.iph.tos), | |
1245 | t->parms.link); | |
b23dd4fe | 1246 | if (IS_ERR(rt)) |
1da177e4 | 1247 | return -EADDRNOTAVAIL; |
d8d1f30b | 1248 | dev = rt->dst.dev; |
1da177e4 | 1249 | ip_rt_put(rt); |
e5ed6399 | 1250 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1251 | return -EADDRNOTAVAIL; |
1252 | t->mlink = dev->ifindex; | |
e5ed6399 | 1253 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1254 | } |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static int ipgre_close(struct net_device *dev) | |
1259 | { | |
2941a486 | 1260 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1261 | |
f97c1e0c | 1262 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1263 | struct in_device *in_dev; |
c346dca1 | 1264 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
8723e1b4 | 1265 | if (in_dev) |
1da177e4 | 1266 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
1267 | } |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | #endif | |
1272 | ||
b8c26a33 SH |
1273 | static const struct net_device_ops ipgre_netdev_ops = { |
1274 | .ndo_init = ipgre_tunnel_init, | |
1275 | .ndo_uninit = ipgre_tunnel_uninit, | |
1276 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1277 | .ndo_open = ipgre_open, | |
1278 | .ndo_stop = ipgre_close, | |
1279 | #endif | |
1280 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1281 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1282 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
87b6d218 | 1283 | .ndo_get_stats64 = ipgre_get_stats64, |
b8c26a33 SH |
1284 | }; |
1285 | ||
e985aad7 ED |
1286 | static void ipgre_dev_free(struct net_device *dev) |
1287 | { | |
1288 | free_percpu(dev->tstats); | |
1289 | free_netdev(dev); | |
1290 | } | |
1291 | ||
1da177e4 LT |
1292 | static void ipgre_tunnel_setup(struct net_device *dev) |
1293 | { | |
b8c26a33 | 1294 | dev->netdev_ops = &ipgre_netdev_ops; |
e985aad7 | 1295 | dev->destructor = ipgre_dev_free; |
1da177e4 LT |
1296 | |
1297 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1298 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1299 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1300 | dev->flags = IFF_NOARP; |
1301 | dev->iflink = 0; | |
1302 | dev->addr_len = 4; | |
0b67eceb | 1303 | dev->features |= NETIF_F_NETNS_LOCAL; |
108bfa89 | 1304 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | static int ipgre_tunnel_init(struct net_device *dev) | |
1308 | { | |
1da177e4 LT |
1309 | struct ip_tunnel *tunnel; |
1310 | struct iphdr *iph; | |
1da177e4 | 1311 | |
2941a486 | 1312 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1313 | iph = &tunnel->parms.iph; |
1314 | ||
1315 | tunnel->dev = dev; | |
1316 | strcpy(tunnel->parms.name, dev->name); | |
1317 | ||
1318 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1319 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1320 | ||
1da177e4 | 1321 | if (iph->daddr) { |
1da177e4 | 1322 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1323 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1324 | if (!iph->saddr) |
1325 | return -EINVAL; | |
1326 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1327 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1328 | } |
1329 | #endif | |
ee34c1eb | 1330 | } else |
6a5f44d7 | 1331 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1332 | |
e985aad7 ED |
1333 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1334 | if (!dev->tstats) | |
1335 | return -ENOMEM; | |
1336 | ||
1da177e4 LT |
1337 | return 0; |
1338 | } | |
1339 | ||
b8c26a33 | 1340 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1341 | { |
2941a486 | 1342 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1343 | struct iphdr *iph = &tunnel->parms.iph; |
1344 | ||
1345 | tunnel->dev = dev; | |
1346 | strcpy(tunnel->parms.name, dev->name); | |
1347 | ||
1348 | iph->version = 4; | |
1349 | iph->protocol = IPPROTO_GRE; | |
1350 | iph->ihl = 5; | |
1351 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1352 | ||
1353 | dev_hold(dev); | |
1da177e4 LT |
1354 | } |
1355 | ||
1356 | ||
00959ade DK |
1357 | static const struct gre_protocol ipgre_protocol = { |
1358 | .handler = ipgre_rcv, | |
1359 | .err_handler = ipgre_err, | |
1da177e4 LT |
1360 | }; |
1361 | ||
eef6dd65 | 1362 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
eb8ce741 PE |
1363 | { |
1364 | int prio; | |
1365 | ||
1366 | for (prio = 0; prio < 4; prio++) { | |
1367 | int h; | |
1368 | for (h = 0; h < HASH_SIZE; h++) { | |
1507850b ED |
1369 | struct ip_tunnel *t; |
1370 | ||
1371 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
eef6dd65 ED |
1372 | |
1373 | while (t != NULL) { | |
1374 | unregister_netdevice_queue(t->dev, head); | |
1507850b | 1375 | t = rtnl_dereference(t->next); |
eef6dd65 | 1376 | } |
eb8ce741 PE |
1377 | } |
1378 | } | |
1379 | } | |
1380 | ||
2c8c1e72 | 1381 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1382 | { |
cfb8fbf2 | 1383 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
59a4c759 | 1384 | int err; |
59a4c759 | 1385 | |
7daa0004 PE |
1386 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1387 | ipgre_tunnel_setup); | |
1388 | if (!ign->fb_tunnel_dev) { | |
1389 | err = -ENOMEM; | |
1390 | goto err_alloc_dev; | |
1391 | } | |
be77e593 | 1392 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1393 | |
b8c26a33 | 1394 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1395 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1396 | |
1397 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1398 | goto err_reg_dev; | |
1399 | ||
3285ee3b ED |
1400 | rcu_assign_pointer(ign->tunnels_wc[0], |
1401 | netdev_priv(ign->fb_tunnel_dev)); | |
59a4c759 PE |
1402 | return 0; |
1403 | ||
7daa0004 | 1404 | err_reg_dev: |
3285ee3b | 1405 | ipgre_dev_free(ign->fb_tunnel_dev); |
7daa0004 | 1406 | err_alloc_dev: |
59a4c759 PE |
1407 | return err; |
1408 | } | |
1409 | ||
2c8c1e72 | 1410 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 PE |
1411 | { |
1412 | struct ipgre_net *ign; | |
eef6dd65 | 1413 | LIST_HEAD(list); |
59a4c759 PE |
1414 | |
1415 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1416 | rtnl_lock(); |
eef6dd65 ED |
1417 | ipgre_destroy_tunnels(ign, &list); |
1418 | unregister_netdevice_many(&list); | |
7daa0004 | 1419 | rtnl_unlock(); |
59a4c759 PE |
1420 | } |
1421 | ||
1422 | static struct pernet_operations ipgre_net_ops = { | |
1423 | .init = ipgre_init_net, | |
1424 | .exit = ipgre_exit_net, | |
cfb8fbf2 EB |
1425 | .id = &ipgre_net_id, |
1426 | .size = sizeof(struct ipgre_net), | |
59a4c759 | 1427 | }; |
1da177e4 | 1428 | |
c19e654d HX |
1429 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1430 | { | |
1431 | __be16 flags; | |
1432 | ||
1433 | if (!data) | |
1434 | return 0; | |
1435 | ||
1436 | flags = 0; | |
1437 | if (data[IFLA_GRE_IFLAGS]) | |
1438 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1439 | if (data[IFLA_GRE_OFLAGS]) | |
1440 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1441 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1442 | return -EINVAL; | |
1443 | ||
1444 | return 0; | |
1445 | } | |
1446 | ||
e1a80002 HX |
1447 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1448 | { | |
1449 | __be32 daddr; | |
1450 | ||
1451 | if (tb[IFLA_ADDRESS]) { | |
1452 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1453 | return -EINVAL; | |
1454 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1455 | return -EADDRNOTAVAIL; | |
1456 | } | |
1457 | ||
1458 | if (!data) | |
1459 | goto out; | |
1460 | ||
1461 | if (data[IFLA_GRE_REMOTE]) { | |
1462 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1463 | if (!daddr) | |
1464 | return -EINVAL; | |
1465 | } | |
1466 | ||
1467 | out: | |
1468 | return ipgre_tunnel_validate(tb, data); | |
1469 | } | |
1470 | ||
c19e654d HX |
1471 | static void ipgre_netlink_parms(struct nlattr *data[], |
1472 | struct ip_tunnel_parm *parms) | |
1473 | { | |
7bb82d92 | 1474 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1475 | |
1476 | parms->iph.protocol = IPPROTO_GRE; | |
1477 | ||
1478 | if (!data) | |
1479 | return; | |
1480 | ||
1481 | if (data[IFLA_GRE_LINK]) | |
1482 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1483 | ||
1484 | if (data[IFLA_GRE_IFLAGS]) | |
1485 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1486 | ||
1487 | if (data[IFLA_GRE_OFLAGS]) | |
1488 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1489 | ||
1490 | if (data[IFLA_GRE_IKEY]) | |
1491 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1492 | ||
1493 | if (data[IFLA_GRE_OKEY]) | |
1494 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1495 | ||
1496 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1497 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1498 | |
1499 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1500 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1501 | |
1502 | if (data[IFLA_GRE_TTL]) | |
1503 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1504 | ||
1505 | if (data[IFLA_GRE_TOS]) | |
1506 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1507 | ||
1508 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1509 | parms->iph.frag_off = htons(IP_DF); | |
1510 | } | |
1511 | ||
e1a80002 HX |
1512 | static int ipgre_tap_init(struct net_device *dev) |
1513 | { | |
1514 | struct ip_tunnel *tunnel; | |
1515 | ||
1516 | tunnel = netdev_priv(dev); | |
1517 | ||
1518 | tunnel->dev = dev; | |
1519 | strcpy(tunnel->parms.name, dev->name); | |
1520 | ||
1521 | ipgre_tunnel_bind_dev(dev); | |
1522 | ||
e985aad7 ED |
1523 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1524 | if (!dev->tstats) | |
1525 | return -ENOMEM; | |
1526 | ||
e1a80002 HX |
1527 | return 0; |
1528 | } | |
1529 | ||
b8c26a33 SH |
1530 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1531 | .ndo_init = ipgre_tap_init, | |
1532 | .ndo_uninit = ipgre_tunnel_uninit, | |
1533 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1534 | .ndo_set_mac_address = eth_mac_addr, | |
1535 | .ndo_validate_addr = eth_validate_addr, | |
1536 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
87b6d218 | 1537 | .ndo_get_stats64 = ipgre_get_stats64, |
b8c26a33 SH |
1538 | }; |
1539 | ||
e1a80002 HX |
1540 | static void ipgre_tap_setup(struct net_device *dev) |
1541 | { | |
1542 | ||
1543 | ether_setup(dev); | |
1544 | ||
2e9526b3 | 1545 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
e985aad7 | 1546 | dev->destructor = ipgre_dev_free; |
e1a80002 HX |
1547 | |
1548 | dev->iflink = 0; | |
1549 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1550 | } | |
1551 | ||
81adee47 | 1552 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
c19e654d HX |
1553 | struct nlattr *data[]) |
1554 | { | |
1555 | struct ip_tunnel *nt; | |
1556 | struct net *net = dev_net(dev); | |
1557 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1558 | int mtu; | |
1559 | int err; | |
1560 | ||
1561 | nt = netdev_priv(dev); | |
1562 | ipgre_netlink_parms(data, &nt->parms); | |
1563 | ||
e1a80002 | 1564 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1565 | return -EEXIST; |
1566 | ||
e1a80002 | 1567 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
f2cedb63 | 1568 | eth_hw_addr_random(dev); |
e1a80002 | 1569 | |
c19e654d HX |
1570 | mtu = ipgre_tunnel_bind_dev(dev); |
1571 | if (!tb[IFLA_MTU]) | |
1572 | dev->mtu = mtu; | |
1573 | ||
b790e01a ED |
1574 | /* Can use a lockless transmit, unless we generate output sequences */ |
1575 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1576 | dev->features |= NETIF_F_LLTX; | |
1577 | ||
c19e654d HX |
1578 | err = register_netdevice(dev); |
1579 | if (err) | |
1580 | goto out; | |
1581 | ||
1582 | dev_hold(dev); | |
1583 | ipgre_tunnel_link(ign, nt); | |
1584 | ||
1585 | out: | |
1586 | return err; | |
1587 | } | |
1588 | ||
1589 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1590 | struct nlattr *data[]) | |
1591 | { | |
1592 | struct ip_tunnel *t, *nt; | |
1593 | struct net *net = dev_net(dev); | |
1594 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1595 | struct ip_tunnel_parm p; | |
1596 | int mtu; | |
1597 | ||
1598 | if (dev == ign->fb_tunnel_dev) | |
1599 | return -EINVAL; | |
1600 | ||
1601 | nt = netdev_priv(dev); | |
1602 | ipgre_netlink_parms(data, &p); | |
1603 | ||
1604 | t = ipgre_tunnel_locate(net, &p, 0); | |
1605 | ||
1606 | if (t) { | |
1607 | if (t->dev != dev) | |
1608 | return -EEXIST; | |
1609 | } else { | |
c19e654d HX |
1610 | t = nt; |
1611 | ||
2e9526b3 | 1612 | if (dev->type != ARPHRD_ETHER) { |
1507850b | 1613 | unsigned int nflags = 0; |
c19e654d | 1614 | |
2e9526b3 HX |
1615 | if (ipv4_is_multicast(p.iph.daddr)) |
1616 | nflags = IFF_BROADCAST; | |
1617 | else if (p.iph.daddr) | |
1618 | nflags = IFF_POINTOPOINT; | |
1619 | ||
1620 | if ((dev->flags ^ nflags) & | |
1621 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1622 | return -EINVAL; | |
1623 | } | |
c19e654d HX |
1624 | |
1625 | ipgre_tunnel_unlink(ign, t); | |
1626 | t->parms.iph.saddr = p.iph.saddr; | |
1627 | t->parms.iph.daddr = p.iph.daddr; | |
1628 | t->parms.i_key = p.i_key; | |
2e9526b3 HX |
1629 | if (dev->type != ARPHRD_ETHER) { |
1630 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1631 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1632 | } | |
c19e654d HX |
1633 | ipgre_tunnel_link(ign, t); |
1634 | netdev_state_change(dev); | |
1635 | } | |
1636 | ||
1637 | t->parms.o_key = p.o_key; | |
1638 | t->parms.iph.ttl = p.iph.ttl; | |
1639 | t->parms.iph.tos = p.iph.tos; | |
1640 | t->parms.iph.frag_off = p.iph.frag_off; | |
1641 | ||
1642 | if (t->parms.link != p.link) { | |
1643 | t->parms.link = p.link; | |
1644 | mtu = ipgre_tunnel_bind_dev(dev); | |
1645 | if (!tb[IFLA_MTU]) | |
1646 | dev->mtu = mtu; | |
1647 | netdev_state_change(dev); | |
1648 | } | |
1649 | ||
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | static size_t ipgre_get_size(const struct net_device *dev) | |
1654 | { | |
1655 | return | |
1656 | /* IFLA_GRE_LINK */ | |
1657 | nla_total_size(4) + | |
1658 | /* IFLA_GRE_IFLAGS */ | |
1659 | nla_total_size(2) + | |
1660 | /* IFLA_GRE_OFLAGS */ | |
1661 | nla_total_size(2) + | |
1662 | /* IFLA_GRE_IKEY */ | |
1663 | nla_total_size(4) + | |
1664 | /* IFLA_GRE_OKEY */ | |
1665 | nla_total_size(4) + | |
1666 | /* IFLA_GRE_LOCAL */ | |
1667 | nla_total_size(4) + | |
1668 | /* IFLA_GRE_REMOTE */ | |
1669 | nla_total_size(4) + | |
1670 | /* IFLA_GRE_TTL */ | |
1671 | nla_total_size(1) + | |
1672 | /* IFLA_GRE_TOS */ | |
1673 | nla_total_size(1) + | |
1674 | /* IFLA_GRE_PMTUDISC */ | |
1675 | nla_total_size(1) + | |
1676 | 0; | |
1677 | } | |
1678 | ||
1679 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1680 | { | |
1681 | struct ip_tunnel *t = netdev_priv(dev); | |
1682 | struct ip_tunnel_parm *p = &t->parms; | |
1683 | ||
f3756b79 DM |
1684 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
1685 | nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || | |
1686 | nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || | |
1687 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || | |
1688 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
1689 | nla_put_be32(skb, IFLA_GRE_LOCAL, p->iph.saddr) || | |
1690 | nla_put_be32(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
1691 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || | |
1692 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1693 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
1694 | !!(p->iph.frag_off & htons(IP_DF)))) | |
1695 | goto nla_put_failure; | |
c19e654d HX |
1696 | return 0; |
1697 | ||
1698 | nla_put_failure: | |
1699 | return -EMSGSIZE; | |
1700 | } | |
1701 | ||
1702 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1703 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1704 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1705 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1706 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1707 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1708 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1709 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1710 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1711 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1712 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1713 | }; | |
1714 | ||
1715 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1716 | .kind = "gre", | |
1717 | .maxtype = IFLA_GRE_MAX, | |
1718 | .policy = ipgre_policy, | |
1719 | .priv_size = sizeof(struct ip_tunnel), | |
1720 | .setup = ipgre_tunnel_setup, | |
1721 | .validate = ipgre_tunnel_validate, | |
1722 | .newlink = ipgre_newlink, | |
1723 | .changelink = ipgre_changelink, | |
1724 | .get_size = ipgre_get_size, | |
1725 | .fill_info = ipgre_fill_info, | |
1726 | }; | |
1727 | ||
e1a80002 HX |
1728 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1729 | .kind = "gretap", | |
1730 | .maxtype = IFLA_GRE_MAX, | |
1731 | .policy = ipgre_policy, | |
1732 | .priv_size = sizeof(struct ip_tunnel), | |
1733 | .setup = ipgre_tap_setup, | |
1734 | .validate = ipgre_tap_validate, | |
1735 | .newlink = ipgre_newlink, | |
1736 | .changelink = ipgre_changelink, | |
1737 | .get_size = ipgre_get_size, | |
1738 | .fill_info = ipgre_fill_info, | |
1739 | }; | |
1740 | ||
1da177e4 LT |
1741 | /* |
1742 | * And now the modules code and kernel interface. | |
1743 | */ | |
1744 | ||
1745 | static int __init ipgre_init(void) | |
1746 | { | |
1747 | int err; | |
1748 | ||
058bd4d2 | 1749 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1750 | |
cfb8fbf2 | 1751 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1752 | if (err < 0) |
c2892f02 AD |
1753 | return err; |
1754 | ||
00959ade | 1755 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1756 | if (err < 0) { |
058bd4d2 | 1757 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1758 | goto add_proto_failed; |
1759 | } | |
7daa0004 | 1760 | |
c19e654d HX |
1761 | err = rtnl_link_register(&ipgre_link_ops); |
1762 | if (err < 0) | |
1763 | goto rtnl_link_failed; | |
1764 | ||
e1a80002 HX |
1765 | err = rtnl_link_register(&ipgre_tap_ops); |
1766 | if (err < 0) | |
1767 | goto tap_ops_failed; | |
1768 | ||
c19e654d | 1769 | out: |
1da177e4 | 1770 | return err; |
c19e654d | 1771 | |
e1a80002 HX |
1772 | tap_ops_failed: |
1773 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1774 | rtnl_link_failed: |
00959ade | 1775 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1776 | add_proto_failed: |
1777 | unregister_pernet_device(&ipgre_net_ops); | |
c19e654d | 1778 | goto out; |
1da177e4 LT |
1779 | } |
1780 | ||
db44575f | 1781 | static void __exit ipgre_fini(void) |
1da177e4 | 1782 | { |
e1a80002 | 1783 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1784 | rtnl_link_unregister(&ipgre_link_ops); |
00959ade | 1785 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
058bd4d2 | 1786 | pr_info("%s: can't remove protocol\n", __func__); |
c2892f02 | 1787 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1788 | } |
1789 | ||
1790 | module_init(ipgre_init); | |
1791 | module_exit(ipgre_fini); | |
1792 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1793 | MODULE_ALIAS_RTNL_LINK("gre"); |
1794 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1795 | MODULE_ALIAS_NETDEV("gre0"); |