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 | ||
4fc268d2 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/types.h> | |
1da177e4 | 16 | #include <linux/kernel.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | #include <asm/uaccess.h> |
19 | #include <linux/skbuff.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/in.h> | |
22 | #include <linux/tcp.h> | |
23 | #include <linux/udp.h> | |
24 | #include <linux/if_arp.h> | |
25 | #include <linux/mroute.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/in6.h> | |
28 | #include <linux/inetdevice.h> | |
29 | #include <linux/igmp.h> | |
30 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 31 | #include <linux/etherdevice.h> |
46f25dff | 32 | #include <linux/if_ether.h> |
1da177e4 LT |
33 | |
34 | #include <net/sock.h> | |
35 | #include <net/ip.h> | |
36 | #include <net/icmp.h> | |
37 | #include <net/protocol.h> | |
38 | #include <net/ipip.h> | |
39 | #include <net/arp.h> | |
40 | #include <net/checksum.h> | |
41 | #include <net/dsfield.h> | |
42 | #include <net/inet_ecn.h> | |
43 | #include <net/xfrm.h> | |
59a4c759 PE |
44 | #include <net/net_namespace.h> |
45 | #include <net/netns/generic.h> | |
c19e654d | 46 | #include <net/rtnetlink.h> |
00959ade | 47 | #include <net/gre.h> |
1da177e4 | 48 | |
dfd56b8b | 49 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
50 | #include <net/ipv6.h> |
51 | #include <net/ip6_fib.h> | |
52 | #include <net/ip6_route.h> | |
53 | #endif | |
54 | ||
55 | /* | |
56 | Problems & solutions | |
57 | -------------------- | |
58 | ||
59 | 1. The most important issue is detecting local dead loops. | |
60 | They would cause complete host lockup in transmit, which | |
61 | would be "resolved" by stack overflow or, if queueing is enabled, | |
62 | with infinite looping in net_bh. | |
63 | ||
64 | We cannot track such dead loops during route installation, | |
65 | it is infeasible task. The most general solutions would be | |
66 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 67 | and silently drop packet when it expires. It is a good |
1da177e4 LT |
68 | solution, but it supposes maintaing new variable in ALL |
69 | skb, even if no tunneling is used. | |
70 | ||
6d0722a2 ED |
71 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
72 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
73 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
74 | |
75 | 2. Networking dead loops would not kill routers, but would really | |
76 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
77 | if we copy it from packet being encapsulated to upper header. | |
78 | It is very good solution, but it introduces two problems: | |
79 | ||
80 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
81 | do not work over tunnels. | |
82 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
83 | so that this problem would be solved and traceroute output | |
84 | would even more informative. This idea appeared to be wrong: | |
85 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
86 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
87 | return only 8 bytes of payload. It is the end. | |
88 | ||
89 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
90 | we should search for another solution. | |
91 | ||
92 | One of them is to parse packet trying to detect inner encapsulation | |
93 | made by our node. It is difficult or even impossible, especially, | |
94 | taking into account fragmentation. TO be short, tt is not solution at all. | |
95 | ||
96 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
97 | We force DF flag on tunnels with preconfigured hop limit, | |
98 | that is ALL. :-) Well, it does not remove the problem completely, | |
99 | but exponential growth of network traffic is changed to linear | |
100 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
101 | fastly degrades to value <68, where looping stops. | |
102 | Yes, it is not good if there exists a router in the loop, | |
103 | which does not force DF, even when encapsulating packets have DF set. | |
104 | But it is not our problem! Nobody could accuse us, we made | |
105 | all that we could make. Even if it is your gated who injected | |
106 | fatal route to network, even if it were you who configured | |
107 | fatal static route: you are innocent. :-) | |
108 | ||
109 | ||
110 | ||
111 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain | |
112 | practically identical code. It would be good to glue them | |
113 | together, but it is not very evident, how to make them modular. | |
114 | sit is integral part of IPv6, ipip and gre are naturally modular. | |
115 | We could extract common parts (hash table, ioctl etc) | |
116 | to a separate module (ip_tunnel.c). | |
117 | ||
118 | Alexey Kuznetsov. | |
119 | */ | |
120 | ||
c19e654d | 121 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 LT |
122 | static int ipgre_tunnel_init(struct net_device *dev); |
123 | static void ipgre_tunnel_setup(struct net_device *dev); | |
42aa9162 | 124 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
1da177e4 LT |
125 | |
126 | /* Fallback tunnel: no source, no destination, no key, no options */ | |
127 | ||
eb8ce741 PE |
128 | #define HASH_SIZE 16 |
129 | ||
f99189b1 | 130 | static int ipgre_net_id __read_mostly; |
59a4c759 | 131 | struct ipgre_net { |
1507850b | 132 | struct ip_tunnel __rcu *tunnels[4][HASH_SIZE]; |
eb8ce741 | 133 | |
7daa0004 | 134 | struct net_device *fb_tunnel_dev; |
59a4c759 PE |
135 | }; |
136 | ||
1da177e4 LT |
137 | /* Tunnel hash table */ |
138 | ||
139 | /* | |
140 | 4 hash tables: | |
141 | ||
142 | 3: (remote,local) | |
143 | 2: (remote,*) | |
144 | 1: (*,local) | |
145 | 0: (*,*) | |
146 | ||
147 | We require exact key match i.e. if a key is present in packet | |
148 | it will match only tunnel with the same key; if it is not present, | |
149 | it will match only keyless tunnel. | |
150 | ||
151 | All keysless packets, if not matched configured keyless tunnels | |
152 | will match fallback tunnel. | |
153 | */ | |
154 | ||
d5a0a1e3 | 155 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 156 | |
eb8ce741 PE |
157 | #define tunnels_r_l tunnels[3] |
158 | #define tunnels_r tunnels[2] | |
159 | #define tunnels_l tunnels[1] | |
160 | #define tunnels_wc tunnels[0] | |
8d5b2c08 | 161 | /* |
1507850b | 162 | * Locking : hash tables are protected by RCU and RTNL |
8d5b2c08 | 163 | */ |
1da177e4 | 164 | |
8d5b2c08 ED |
165 | #define for_each_ip_tunnel_rcu(start) \ |
166 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 167 | |
e985aad7 ED |
168 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
169 | struct pcpu_tstats { | |
170 | unsigned long rx_packets; | |
171 | unsigned long rx_bytes; | |
172 | unsigned long tx_packets; | |
173 | unsigned long tx_bytes; | |
8ce120f1 | 174 | } __attribute__((aligned(4*sizeof(unsigned long)))); |
e985aad7 ED |
175 | |
176 | static struct net_device_stats *ipgre_get_stats(struct net_device *dev) | |
177 | { | |
178 | struct pcpu_tstats sum = { 0 }; | |
179 | int i; | |
180 | ||
181 | for_each_possible_cpu(i) { | |
182 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
183 | ||
184 | sum.rx_packets += tstats->rx_packets; | |
185 | sum.rx_bytes += tstats->rx_bytes; | |
186 | sum.tx_packets += tstats->tx_packets; | |
187 | sum.tx_bytes += tstats->tx_bytes; | |
188 | } | |
189 | dev->stats.rx_packets = sum.rx_packets; | |
190 | dev->stats.rx_bytes = sum.rx_bytes; | |
191 | dev->stats.tx_packets = sum.tx_packets; | |
192 | dev->stats.tx_bytes = sum.tx_bytes; | |
193 | return &dev->stats; | |
194 | } | |
195 | ||
1da177e4 LT |
196 | /* Given src, dst and key, find appropriate for input tunnel. */ |
197 | ||
749c10f9 | 198 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev, |
e1a80002 HX |
199 | __be32 remote, __be32 local, |
200 | __be32 key, __be16 gre_proto) | |
1da177e4 | 201 | { |
749c10f9 TT |
202 | struct net *net = dev_net(dev); |
203 | int link = dev->ifindex; | |
1507850b ED |
204 | unsigned int h0 = HASH(remote); |
205 | unsigned int h1 = HASH(key); | |
afcf1242 | 206 | struct ip_tunnel *t, *cand = NULL; |
7daa0004 | 207 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
208 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
209 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
afcf1242 | 210 | int score, cand_score = 4; |
1da177e4 | 211 | |
8d5b2c08 | 212 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
749c10f9 TT |
213 | if (local != t->parms.iph.saddr || |
214 | remote != t->parms.iph.daddr || | |
215 | key != t->parms.i_key || | |
216 | !(t->dev->flags & IFF_UP)) | |
217 | continue; | |
218 | ||
219 | if (t->dev->type != ARPHRD_IPGRE && | |
220 | t->dev->type != dev_type) | |
221 | continue; | |
222 | ||
afcf1242 | 223 | score = 0; |
749c10f9 | 224 | if (t->parms.link != link) |
afcf1242 | 225 | score |= 1; |
749c10f9 | 226 | if (t->dev->type != dev_type) |
afcf1242 TT |
227 | score |= 2; |
228 | if (score == 0) | |
749c10f9 | 229 | return t; |
afcf1242 TT |
230 | |
231 | if (score < cand_score) { | |
232 | cand = t; | |
233 | cand_score = score; | |
234 | } | |
1da177e4 | 235 | } |
e1a80002 | 236 | |
8d5b2c08 | 237 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
749c10f9 TT |
238 | if (remote != t->parms.iph.daddr || |
239 | key != t->parms.i_key || | |
240 | !(t->dev->flags & IFF_UP)) | |
241 | continue; | |
242 | ||
243 | if (t->dev->type != ARPHRD_IPGRE && | |
244 | t->dev->type != dev_type) | |
245 | continue; | |
246 | ||
afcf1242 | 247 | score = 0; |
749c10f9 | 248 | if (t->parms.link != link) |
afcf1242 | 249 | score |= 1; |
749c10f9 | 250 | if (t->dev->type != dev_type) |
afcf1242 TT |
251 | score |= 2; |
252 | if (score == 0) | |
749c10f9 | 253 | return t; |
afcf1242 TT |
254 | |
255 | if (score < cand_score) { | |
256 | cand = t; | |
257 | cand_score = score; | |
258 | } | |
1da177e4 | 259 | } |
e1a80002 | 260 | |
8d5b2c08 | 261 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
749c10f9 TT |
262 | if ((local != t->parms.iph.saddr && |
263 | (local != t->parms.iph.daddr || | |
264 | !ipv4_is_multicast(local))) || | |
265 | key != t->parms.i_key || | |
266 | !(t->dev->flags & IFF_UP)) | |
267 | continue; | |
268 | ||
269 | if (t->dev->type != ARPHRD_IPGRE && | |
270 | t->dev->type != dev_type) | |
271 | continue; | |
272 | ||
afcf1242 | 273 | score = 0; |
749c10f9 | 274 | if (t->parms.link != link) |
afcf1242 | 275 | score |= 1; |
749c10f9 | 276 | if (t->dev->type != dev_type) |
afcf1242 TT |
277 | score |= 2; |
278 | if (score == 0) | |
749c10f9 | 279 | return t; |
afcf1242 TT |
280 | |
281 | if (score < cand_score) { | |
282 | cand = t; | |
283 | cand_score = score; | |
284 | } | |
1da177e4 | 285 | } |
e1a80002 | 286 | |
8d5b2c08 | 287 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
749c10f9 TT |
288 | if (t->parms.i_key != key || |
289 | !(t->dev->flags & IFF_UP)) | |
290 | continue; | |
291 | ||
292 | if (t->dev->type != ARPHRD_IPGRE && | |
293 | t->dev->type != dev_type) | |
294 | continue; | |
295 | ||
afcf1242 | 296 | score = 0; |
749c10f9 | 297 | if (t->parms.link != link) |
afcf1242 | 298 | score |= 1; |
749c10f9 | 299 | if (t->dev->type != dev_type) |
afcf1242 TT |
300 | score |= 2; |
301 | if (score == 0) | |
749c10f9 | 302 | return t; |
afcf1242 TT |
303 | |
304 | if (score < cand_score) { | |
305 | cand = t; | |
306 | cand_score = score; | |
307 | } | |
1da177e4 LT |
308 | } |
309 | ||
afcf1242 TT |
310 | if (cand != NULL) |
311 | return cand; | |
e1a80002 | 312 | |
8d5b2c08 ED |
313 | dev = ign->fb_tunnel_dev; |
314 | if (dev->flags & IFF_UP) | |
315 | return netdev_priv(dev); | |
749c10f9 | 316 | |
1da177e4 LT |
317 | return NULL; |
318 | } | |
319 | ||
1507850b | 320 | static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 321 | struct ip_tunnel_parm *parms) |
1da177e4 | 322 | { |
5056a1ef YH |
323 | __be32 remote = parms->iph.daddr; |
324 | __be32 local = parms->iph.saddr; | |
325 | __be32 key = parms->i_key; | |
1507850b | 326 | unsigned int h = HASH(key); |
1da177e4 LT |
327 | int prio = 0; |
328 | ||
329 | if (local) | |
330 | prio |= 1; | |
f97c1e0c | 331 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
332 | prio |= 2; |
333 | h ^= HASH(remote); | |
334 | } | |
335 | ||
eb8ce741 | 336 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
337 | } |
338 | ||
1507850b | 339 | static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 340 | struct ip_tunnel *t) |
5056a1ef | 341 | { |
f57e7d5a | 342 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
343 | } |
344 | ||
f57e7d5a | 345 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 346 | { |
1507850b | 347 | struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t); |
1da177e4 | 348 | |
1507850b | 349 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
8d5b2c08 | 350 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
351 | } |
352 | ||
f57e7d5a | 353 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 354 | { |
1507850b ED |
355 | struct ip_tunnel __rcu **tp; |
356 | struct ip_tunnel *iter; | |
357 | ||
358 | for (tp = ipgre_bucket(ign, t); | |
359 | (iter = rtnl_dereference(*tp)) != NULL; | |
360 | tp = &iter->next) { | |
361 | if (t == iter) { | |
362 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
363 | break; |
364 | } | |
365 | } | |
366 | } | |
367 | ||
e1a80002 HX |
368 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
369 | struct ip_tunnel_parm *parms, | |
370 | int type) | |
1da177e4 | 371 | { |
d5a0a1e3 AV |
372 | __be32 remote = parms->iph.daddr; |
373 | __be32 local = parms->iph.saddr; | |
374 | __be32 key = parms->i_key; | |
749c10f9 | 375 | int link = parms->link; |
1507850b ED |
376 | struct ip_tunnel *t; |
377 | struct ip_tunnel __rcu **tp; | |
e1a80002 HX |
378 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
379 | ||
1507850b ED |
380 | for (tp = __ipgre_bucket(ign, parms); |
381 | (t = rtnl_dereference(*tp)) != NULL; | |
382 | tp = &t->next) | |
e1a80002 HX |
383 | if (local == t->parms.iph.saddr && |
384 | remote == t->parms.iph.daddr && | |
385 | key == t->parms.i_key && | |
749c10f9 | 386 | link == t->parms.link && |
e1a80002 HX |
387 | type == t->dev->type) |
388 | break; | |
389 | ||
390 | return t; | |
391 | } | |
392 | ||
1507850b | 393 | static struct ip_tunnel *ipgre_tunnel_locate(struct net *net, |
e1a80002 HX |
394 | struct ip_tunnel_parm *parms, int create) |
395 | { | |
396 | struct ip_tunnel *t, *nt; | |
1da177e4 | 397 | struct net_device *dev; |
1da177e4 | 398 | char name[IFNAMSIZ]; |
f57e7d5a | 399 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 400 | |
e1a80002 HX |
401 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
402 | if (t || !create) | |
403 | return t; | |
1da177e4 LT |
404 | |
405 | if (parms->name[0]) | |
406 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 407 | else |
407d6fcb | 408 | strcpy(name, "gre%d"); |
1da177e4 LT |
409 | |
410 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
411 | if (!dev) | |
407d6fcb | 412 | return NULL; |
1da177e4 | 413 | |
0b67eceb PE |
414 | dev_net_set(dev, net); |
415 | ||
2941a486 | 416 | nt = netdev_priv(dev); |
1da177e4 | 417 | nt->parms = *parms; |
c19e654d | 418 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 419 | |
42aa9162 HX |
420 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
421 | ||
b37d428b PE |
422 | if (register_netdevice(dev) < 0) |
423 | goto failed_free; | |
1da177e4 | 424 | |
f2b3ee9e WB |
425 | /* Can use a lockless transmit, unless we generate output sequences */ |
426 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
427 | dev->features |= NETIF_F_LLTX; | |
428 | ||
1da177e4 | 429 | dev_hold(dev); |
f57e7d5a | 430 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
431 | return nt; |
432 | ||
b37d428b PE |
433 | failed_free: |
434 | free_netdev(dev); | |
1da177e4 LT |
435 | return NULL; |
436 | } | |
437 | ||
438 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
439 | { | |
f57e7d5a PE |
440 | struct net *net = dev_net(dev); |
441 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
442 | ||
443 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
444 | dev_put(dev); |
445 | } | |
446 | ||
447 | ||
448 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
449 | { | |
1da177e4 | 450 | |
071f92d0 | 451 | /* All the routers (except for Linux) return only |
1da177e4 LT |
452 | 8 bytes of packet payload. It means, that precise relaying of |
453 | ICMP in the real Internet is absolutely infeasible. | |
454 | ||
455 | Moreover, Cisco "wise men" put GRE key to the third word | |
456 | in GRE header. It makes impossible maintaining even soft state for keyed | |
457 | GRE tunnels with enabled checksum. Tell them "thank you". | |
458 | ||
459 | Well, I wonder, rfc1812 was written by Cisco employee, | |
460 | what the hell these idiots break standrads established | |
461 | by themself??? | |
462 | */ | |
463 | ||
b71d1d42 | 464 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
d5a0a1e3 | 465 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 466 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
467 | const int type = icmp_hdr(skb)->type; |
468 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 469 | struct ip_tunnel *t; |
d5a0a1e3 | 470 | __be16 flags; |
1da177e4 LT |
471 | |
472 | flags = p[0]; | |
473 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
474 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
475 | return; | |
476 | if (flags&GRE_KEY) { | |
477 | grehlen += 4; | |
478 | if (flags&GRE_CSUM) | |
479 | grehlen += 4; | |
480 | } | |
481 | } | |
482 | ||
483 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
484 | if (skb_headlen(skb) < grehlen) | |
485 | return; | |
486 | ||
487 | switch (type) { | |
488 | default: | |
489 | case ICMP_PARAMETERPROB: | |
490 | return; | |
491 | ||
492 | case ICMP_DEST_UNREACH: | |
493 | switch (code) { | |
494 | case ICMP_SR_FAILED: | |
495 | case ICMP_PORT_UNREACH: | |
496 | /* Impossible event. */ | |
497 | return; | |
498 | case ICMP_FRAG_NEEDED: | |
499 | /* Soft state for pmtu is maintained by IP core. */ | |
500 | return; | |
501 | default: | |
502 | /* All others are translated to HOST_UNREACH. | |
503 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
504 | I believe they are just ether pollution. --ANK | |
505 | */ | |
506 | break; | |
507 | } | |
508 | break; | |
509 | case ICMP_TIME_EXCEEDED: | |
510 | if (code != ICMP_EXC_TTL) | |
511 | return; | |
512 | break; | |
513 | } | |
514 | ||
8d5b2c08 | 515 | rcu_read_lock(); |
749c10f9 | 516 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
517 | flags & GRE_KEY ? |
518 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
519 | p[1]); | |
f97c1e0c JP |
520 | if (t == NULL || t->parms.iph.daddr == 0 || |
521 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
522 | goto out; |
523 | ||
524 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
525 | goto out; | |
526 | ||
da6185d8 | 527 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
528 | t->err_count++; |
529 | else | |
530 | t->err_count = 1; | |
531 | t->err_time = jiffies; | |
532 | out: | |
8d5b2c08 | 533 | rcu_read_unlock(); |
1da177e4 LT |
534 | } |
535 | ||
b71d1d42 | 536 | static inline void ipgre_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
537 | { |
538 | if (INET_ECN_is_ce(iph->tos)) { | |
539 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 540 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 541 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 542 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
543 | } |
544 | } | |
545 | } | |
546 | ||
547 | static inline u8 | |
b71d1d42 | 548 | ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb) |
1da177e4 LT |
549 | { |
550 | u8 inner = 0; | |
551 | if (skb->protocol == htons(ETH_P_IP)) | |
552 | inner = old_iph->tos; | |
553 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
b71d1d42 | 554 | inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
555 | return INET_ECN_encapsulate(tos, inner); |
556 | } | |
557 | ||
558 | static int ipgre_rcv(struct sk_buff *skb) | |
559 | { | |
b71d1d42 | 560 | const struct iphdr *iph; |
1da177e4 | 561 | u8 *h; |
d5a0a1e3 | 562 | __be16 flags; |
d3bc23e7 | 563 | __sum16 csum = 0; |
d5a0a1e3 | 564 | __be32 key = 0; |
1da177e4 LT |
565 | u32 seqno = 0; |
566 | struct ip_tunnel *tunnel; | |
567 | int offset = 4; | |
e1a80002 | 568 | __be16 gre_proto; |
1da177e4 LT |
569 | |
570 | if (!pskb_may_pull(skb, 16)) | |
571 | goto drop_nolock; | |
572 | ||
eddc9ec5 | 573 | iph = ip_hdr(skb); |
1da177e4 | 574 | h = skb->data; |
d5a0a1e3 | 575 | flags = *(__be16*)h; |
1da177e4 LT |
576 | |
577 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
578 | /* - Version must be 0. | |
579 | - We do not support routing headers. | |
580 | */ | |
581 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
582 | goto drop_nolock; | |
583 | ||
584 | if (flags&GRE_CSUM) { | |
fb286bb2 | 585 | switch (skb->ip_summed) { |
84fa7933 | 586 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 587 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
588 | if (!csum) |
589 | break; | |
590 | /* fall through */ | |
591 | case CHECKSUM_NONE: | |
592 | skb->csum = 0; | |
593 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 594 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
595 | } |
596 | offset += 4; | |
597 | } | |
598 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 599 | key = *(__be32*)(h + offset); |
1da177e4 LT |
600 | offset += 4; |
601 | } | |
602 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 603 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
604 | offset += 4; |
605 | } | |
606 | } | |
607 | ||
e1a80002 HX |
608 | gre_proto = *(__be16 *)(h + 2); |
609 | ||
8d5b2c08 | 610 | rcu_read_lock(); |
749c10f9 | 611 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
612 | iph->saddr, iph->daddr, key, |
613 | gre_proto))) { | |
e985aad7 | 614 | struct pcpu_tstats *tstats; |
addd68eb | 615 | |
1da177e4 LT |
616 | secpath_reset(skb); |
617 | ||
e1a80002 | 618 | skb->protocol = gre_proto; |
1da177e4 LT |
619 | /* WCCP version 1 and 2 protocol decoding. |
620 | * - Change protocol to IP | |
621 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
622 | */ | |
e1a80002 | 623 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 624 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 625 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
626 | offset += 4; |
627 | } | |
628 | ||
1d069167 | 629 | skb->mac_header = skb->network_header; |
4209fb60 | 630 | __pskb_pull(skb, offset); |
9c70220b | 631 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
632 | skb->pkt_type = PACKET_HOST; |
633 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 634 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 635 | /* Looped back packet, drop it! */ |
c7537967 | 636 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 637 | goto drop; |
e985aad7 | 638 | tunnel->dev->stats.multicast++; |
1da177e4 LT |
639 | skb->pkt_type = PACKET_BROADCAST; |
640 | } | |
641 | #endif | |
642 | ||
643 | if (((flags&GRE_CSUM) && csum) || | |
644 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
e985aad7 ED |
645 | tunnel->dev->stats.rx_crc_errors++; |
646 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
647 | goto drop; |
648 | } | |
649 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
650 | if (!(flags&GRE_SEQ) || | |
651 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
e985aad7 ED |
652 | tunnel->dev->stats.rx_fifo_errors++; |
653 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
654 | goto drop; |
655 | } | |
656 | tunnel->i_seqno = seqno + 1; | |
657 | } | |
e1a80002 HX |
658 | |
659 | /* Warning: All skb pointers will be invalidated! */ | |
660 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
661 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
e985aad7 ED |
662 | tunnel->dev->stats.rx_length_errors++; |
663 | tunnel->dev->stats.rx_errors++; | |
e1a80002 HX |
664 | goto drop; |
665 | } | |
666 | ||
667 | iph = ip_hdr(skb); | |
668 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
669 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
670 | } | |
671 | ||
e985aad7 ED |
672 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
673 | tstats->rx_packets++; | |
674 | tstats->rx_bytes += skb->len; | |
675 | ||
676 | __skb_tunnel_rx(skb, tunnel->dev); | |
e1a80002 HX |
677 | |
678 | skb_reset_network_header(skb); | |
1da177e4 | 679 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 680 | |
caf586e5 | 681 | netif_rx(skb); |
8990f468 | 682 | |
8d5b2c08 | 683 | rcu_read_unlock(); |
8990f468 | 684 | return 0; |
1da177e4 | 685 | } |
45af08be | 686 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
687 | |
688 | drop: | |
8d5b2c08 | 689 | rcu_read_unlock(); |
1da177e4 LT |
690 | drop_nolock: |
691 | kfree_skb(skb); | |
a02cec21 | 692 | return 0; |
1da177e4 LT |
693 | } |
694 | ||
6fef4c0c | 695 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 696 | { |
2941a486 | 697 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e985aad7 | 698 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
699 | const struct iphdr *old_iph = ip_hdr(skb); |
700 | const struct iphdr *tiph; | |
cbb1e85f | 701 | struct flowi4 fl4; |
1da177e4 | 702 | u8 tos; |
d5a0a1e3 | 703 | __be16 df; |
1da177e4 | 704 | struct rtable *rt; /* Route to the other host */ |
1507850b | 705 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 706 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 707 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 708 | int gre_hlen; |
d5a0a1e3 | 709 | __be32 dst; |
1da177e4 LT |
710 | int mtu; |
711 | ||
e1a80002 HX |
712 | if (dev->type == ARPHRD_ETHER) |
713 | IPCB(skb)->flags = 0; | |
714 | ||
715 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 716 | gre_hlen = 0; |
b71d1d42 | 717 | tiph = (const struct iphdr *)skb->data; |
1da177e4 LT |
718 | } else { |
719 | gre_hlen = tunnel->hlen; | |
720 | tiph = &tunnel->parms.iph; | |
721 | } | |
722 | ||
723 | if ((dst = tiph->daddr) == 0) { | |
724 | /* NBMA tunnel */ | |
725 | ||
adf30907 | 726 | if (skb_dst(skb) == NULL) { |
e985aad7 | 727 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
728 | goto tx_error; |
729 | } | |
730 | ||
61d57f87 | 731 | if (skb->protocol == htons(ETH_P_IP)) { |
511c3f92 | 732 | rt = skb_rtable(skb); |
61d57f87 DM |
733 | dst = rt->rt_gateway; |
734 | } | |
dfd56b8b | 735 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 736 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
b71d1d42 | 737 | const struct in6_addr *addr6; |
0ec88662 DM |
738 | struct neighbour *neigh; |
739 | bool do_tx_error_icmp; | |
1da177e4 | 740 | int addr_type; |
1da177e4 | 741 | |
0ec88662 | 742 | neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
743 | if (neigh == NULL) |
744 | goto tx_error; | |
745 | ||
b71d1d42 | 746 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
747 | addr_type = ipv6_addr_type(addr6); |
748 | ||
749 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 750 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
751 | addr_type = ipv6_addr_type(addr6); |
752 | } | |
753 | ||
754 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
0ec88662 DM |
755 | do_tx_error_icmp = true; |
756 | else { | |
757 | do_tx_error_icmp = false; | |
758 | dst = addr6->s6_addr32[3]; | |
759 | } | |
760 | neigh_release(neigh); | |
761 | if (do_tx_error_icmp) | |
1da177e4 | 762 | goto tx_error_icmp; |
1da177e4 LT |
763 | } |
764 | #endif | |
765 | else | |
766 | goto tx_error; | |
767 | } | |
768 | ||
769 | tos = tiph->tos; | |
ee686ca9 AJ |
770 | if (tos == 1) { |
771 | tos = 0; | |
1da177e4 LT |
772 | if (skb->protocol == htons(ETH_P_IP)) |
773 | tos = old_iph->tos; | |
dd4ba83d | 774 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 775 | tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
776 | } |
777 | ||
cbb1e85f | 778 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr, |
78fbfd8a DM |
779 | tunnel->parms.o_key, RT_TOS(tos), |
780 | tunnel->parms.link); | |
781 | if (IS_ERR(rt)) { | |
782 | dev->stats.tx_carrier_errors++; | |
783 | goto tx_error; | |
1da177e4 | 784 | } |
d8d1f30b | 785 | tdev = rt->dst.dev; |
1da177e4 LT |
786 | |
787 | if (tdev == dev) { | |
788 | ip_rt_put(rt); | |
e985aad7 | 789 | dev->stats.collisions++; |
1da177e4 LT |
790 | goto tx_error; |
791 | } | |
792 | ||
793 | df = tiph->frag_off; | |
794 | if (df) | |
d8d1f30b | 795 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 | 796 | else |
adf30907 | 797 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 | 798 | |
adf30907 ED |
799 | if (skb_dst(skb)) |
800 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
801 | |
802 | if (skb->protocol == htons(ETH_P_IP)) { | |
803 | df |= (old_iph->frag_off&htons(IP_DF)); | |
804 | ||
805 | if ((old_iph->frag_off&htons(IP_DF)) && | |
806 | mtu < ntohs(old_iph->tot_len)) { | |
807 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
808 | ip_rt_put(rt); | |
809 | goto tx_error; | |
810 | } | |
811 | } | |
dfd56b8b | 812 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 813 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
adf30907 | 814 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
1da177e4 | 815 | |
adf30907 | 816 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
f97c1e0c JP |
817 | if ((tunnel->parms.iph.daddr && |
818 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
819 | rt6->rt6i_dst.plen == 128) { |
820 | rt6->rt6i_flags |= RTF_MODIFIED; | |
defb3519 | 821 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); |
1da177e4 LT |
822 | } |
823 | } | |
824 | ||
825 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
3ffe533c | 826 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1da177e4 LT |
827 | ip_rt_put(rt); |
828 | goto tx_error; | |
829 | } | |
830 | } | |
831 | #endif | |
832 | ||
833 | if (tunnel->err_count > 0) { | |
da6185d8 WY |
834 | if (time_before(jiffies, |
835 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
836 | tunnel->err_count--; |
837 | ||
838 | dst_link_failure(skb); | |
839 | } else | |
840 | tunnel->err_count = 0; | |
841 | } | |
842 | ||
d8d1f30b | 843 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
1da177e4 | 844 | |
cfbba49d PM |
845 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
846 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 847 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
805dc1d6 HX |
848 | if (max_headroom > dev->needed_headroom) |
849 | dev->needed_headroom = max_headroom; | |
1da177e4 LT |
850 | if (!new_skb) { |
851 | ip_rt_put(rt); | |
e985aad7 | 852 | dev->stats.tx_dropped++; |
1da177e4 | 853 | dev_kfree_skb(skb); |
6ed10654 | 854 | return NETDEV_TX_OK; |
1da177e4 LT |
855 | } |
856 | if (skb->sk) | |
857 | skb_set_owner_w(new_skb, skb->sk); | |
858 | dev_kfree_skb(skb); | |
859 | skb = new_skb; | |
eddc9ec5 | 860 | old_iph = ip_hdr(skb); |
1da177e4 LT |
861 | } |
862 | ||
64194c31 | 863 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
864 | skb_push(skb, gre_hlen); |
865 | skb_reset_network_header(skb); | |
1da177e4 | 866 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
867 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
868 | IPSKB_REROUTED); | |
adf30907 | 869 | skb_dst_drop(skb); |
d8d1f30b | 870 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
871 | |
872 | /* | |
873 | * Push down and install the IPIP header. | |
874 | */ | |
875 | ||
eddc9ec5 | 876 | iph = ip_hdr(skb); |
1da177e4 LT |
877 | iph->version = 4; |
878 | iph->ihl = sizeof(struct iphdr) >> 2; | |
879 | iph->frag_off = df; | |
880 | iph->protocol = IPPROTO_GRE; | |
881 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
cbb1e85f DM |
882 | iph->daddr = fl4.daddr; |
883 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
884 | |
885 | if ((iph->ttl = tiph->ttl) == 0) { | |
886 | if (skb->protocol == htons(ETH_P_IP)) | |
887 | iph->ttl = old_iph->ttl; | |
dfd56b8b | 888 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 889 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 890 | iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
891 | #endif |
892 | else | |
323e126f | 893 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
1da177e4 LT |
894 | } |
895 | ||
e1a80002 HX |
896 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
897 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
898 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
899 | |
900 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 901 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
902 | |
903 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
904 | ++tunnel->o_seqno; | |
905 | *ptr = htonl(tunnel->o_seqno); | |
906 | ptr--; | |
907 | } | |
908 | if (tunnel->parms.o_flags&GRE_KEY) { | |
909 | *ptr = tunnel->parms.o_key; | |
910 | ptr--; | |
911 | } | |
912 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
913 | *ptr = 0; | |
5f92a738 | 914 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
915 | } |
916 | } | |
917 | ||
918 | nf_reset(skb); | |
e985aad7 ED |
919 | tstats = this_cpu_ptr(dev->tstats); |
920 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 921 | return NETDEV_TX_OK; |
1da177e4 | 922 | |
496053f4 | 923 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
924 | tx_error_icmp: |
925 | dst_link_failure(skb); | |
496053f4 | 926 | #endif |
1da177e4 | 927 | tx_error: |
e985aad7 | 928 | dev->stats.tx_errors++; |
1da177e4 | 929 | dev_kfree_skb(skb); |
6ed10654 | 930 | return NETDEV_TX_OK; |
1da177e4 LT |
931 | } |
932 | ||
42aa9162 | 933 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
934 | { |
935 | struct net_device *tdev = NULL; | |
936 | struct ip_tunnel *tunnel; | |
b71d1d42 | 937 | const struct iphdr *iph; |
ee34c1eb MS |
938 | int hlen = LL_MAX_HEADER; |
939 | int mtu = ETH_DATA_LEN; | |
940 | int addend = sizeof(struct iphdr) + 4; | |
941 | ||
942 | tunnel = netdev_priv(dev); | |
943 | iph = &tunnel->parms.iph; | |
944 | ||
c95b819a | 945 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
946 | |
947 | if (iph->daddr) { | |
cbb1e85f DM |
948 | struct flowi4 fl4; |
949 | struct rtable *rt; | |
950 | ||
951 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
952 | iph->daddr, iph->saddr, | |
953 | tunnel->parms.o_key, | |
954 | RT_TOS(iph->tos), | |
955 | tunnel->parms.link); | |
b23dd4fe | 956 | if (!IS_ERR(rt)) { |
d8d1f30b | 957 | tdev = rt->dst.dev; |
ee34c1eb MS |
958 | ip_rt_put(rt); |
959 | } | |
e1a80002 HX |
960 | |
961 | if (dev->type != ARPHRD_ETHER) | |
962 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
963 | } |
964 | ||
965 | if (!tdev && tunnel->parms.link) | |
96635522 | 966 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
967 | |
968 | if (tdev) { | |
c95b819a | 969 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
970 | mtu = tdev->mtu; |
971 | } | |
972 | dev->iflink = tunnel->parms.link; | |
973 | ||
974 | /* Precalculate GRE options length */ | |
975 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
976 | if (tunnel->parms.o_flags&GRE_CSUM) | |
977 | addend += 4; | |
978 | if (tunnel->parms.o_flags&GRE_KEY) | |
979 | addend += 4; | |
980 | if (tunnel->parms.o_flags&GRE_SEQ) | |
981 | addend += 4; | |
982 | } | |
c95b819a | 983 | dev->needed_headroom = addend + hlen; |
8cdb0456 | 984 | mtu -= dev->hard_header_len + addend; |
42aa9162 HX |
985 | |
986 | if (mtu < 68) | |
987 | mtu = 68; | |
988 | ||
ee34c1eb MS |
989 | tunnel->hlen = addend; |
990 | ||
42aa9162 | 991 | return mtu; |
ee34c1eb MS |
992 | } |
993 | ||
1da177e4 LT |
994 | static int |
995 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
996 | { | |
997 | int err = 0; | |
998 | struct ip_tunnel_parm p; | |
999 | struct ip_tunnel *t; | |
f57e7d5a PE |
1000 | struct net *net = dev_net(dev); |
1001 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
1002 | |
1003 | switch (cmd) { | |
1004 | case SIOCGETTUNNEL: | |
1005 | t = NULL; | |
7daa0004 | 1006 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1007 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1008 | err = -EFAULT; | |
1009 | break; | |
1010 | } | |
f57e7d5a | 1011 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
1012 | } |
1013 | if (t == NULL) | |
2941a486 | 1014 | t = netdev_priv(dev); |
1da177e4 LT |
1015 | memcpy(&p, &t->parms, sizeof(p)); |
1016 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1017 | err = -EFAULT; | |
1018 | break; | |
1019 | ||
1020 | case SIOCADDTUNNEL: | |
1021 | case SIOCCHGTUNNEL: | |
1022 | err = -EPERM; | |
1023 | if (!capable(CAP_NET_ADMIN)) | |
1024 | goto done; | |
1025 | ||
1026 | err = -EFAULT; | |
1027 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1028 | goto done; | |
1029 | ||
1030 | err = -EINVAL; | |
1031 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
1032 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
1033 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
1034 | goto done; | |
1035 | if (p.iph.ttl) | |
1036 | p.iph.frag_off |= htons(IP_DF); | |
1037 | ||
1038 | if (!(p.i_flags&GRE_KEY)) | |
1039 | p.i_key = 0; | |
1040 | if (!(p.o_flags&GRE_KEY)) | |
1041 | p.o_key = 0; | |
1042 | ||
f57e7d5a | 1043 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1044 | |
7daa0004 | 1045 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1046 | if (t != NULL) { |
1047 | if (t->dev != dev) { | |
1048 | err = -EEXIST; | |
1049 | break; | |
1050 | } | |
1051 | } else { | |
1507850b | 1052 | unsigned int nflags = 0; |
1da177e4 | 1053 | |
2941a486 | 1054 | t = netdev_priv(dev); |
1da177e4 | 1055 | |
f97c1e0c | 1056 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1057 | nflags = IFF_BROADCAST; |
1058 | else if (p.iph.daddr) | |
1059 | nflags = IFF_POINTOPOINT; | |
1060 | ||
1061 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1062 | err = -EINVAL; | |
1063 | break; | |
1064 | } | |
f57e7d5a | 1065 | ipgre_tunnel_unlink(ign, t); |
74b0b85b | 1066 | synchronize_net(); |
1da177e4 LT |
1067 | t->parms.iph.saddr = p.iph.saddr; |
1068 | t->parms.iph.daddr = p.iph.daddr; | |
1069 | t->parms.i_key = p.i_key; | |
1070 | t->parms.o_key = p.o_key; | |
1071 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1072 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1073 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1074 | netdev_state_change(dev); |
1075 | } | |
1076 | } | |
1077 | ||
1078 | if (t) { | |
1079 | err = 0; | |
1080 | if (cmd == SIOCCHGTUNNEL) { | |
1081 | t->parms.iph.ttl = p.iph.ttl; | |
1082 | t->parms.iph.tos = p.iph.tos; | |
1083 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1084 | if (t->parms.link != p.link) { |
1085 | t->parms.link = p.link; | |
42aa9162 | 1086 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1087 | netdev_state_change(dev); |
1088 | } | |
1da177e4 LT |
1089 | } |
1090 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1091 | err = -EFAULT; | |
1092 | } else | |
1093 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1094 | break; | |
1095 | ||
1096 | case SIOCDELTUNNEL: | |
1097 | err = -EPERM; | |
1098 | if (!capable(CAP_NET_ADMIN)) | |
1099 | goto done; | |
1100 | ||
7daa0004 | 1101 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1102 | err = -EFAULT; |
1103 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1104 | goto done; | |
1105 | err = -ENOENT; | |
f57e7d5a | 1106 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1107 | goto done; |
1108 | err = -EPERM; | |
7daa0004 | 1109 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1110 | goto done; |
1111 | dev = t->dev; | |
1112 | } | |
22f8cde5 SH |
1113 | unregister_netdevice(dev); |
1114 | err = 0; | |
1da177e4 LT |
1115 | break; |
1116 | ||
1117 | default: | |
1118 | err = -EINVAL; | |
1119 | } | |
1120 | ||
1121 | done: | |
1122 | return err; | |
1123 | } | |
1124 | ||
1da177e4 LT |
1125 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1126 | { | |
2941a486 | 1127 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1128 | if (new_mtu < 68 || |
1129 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1130 | return -EINVAL; |
1131 | dev->mtu = new_mtu; | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1da177e4 LT |
1135 | /* Nice toy. Unfortunately, useless in real life :-) |
1136 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1137 | over the Internet, provided multicast routing is tuned. | |
1138 | ||
1139 | ||
1140 | I have no idea was this bicycle invented before me, | |
1141 | so that I had to set ARPHRD_IPGRE to a random value. | |
1142 | I have an impression, that Cisco could make something similar, | |
1143 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1144 | |
1da177e4 LT |
1145 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1146 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1147 | ||
1148 | ping -t 255 224.66.66.66 | |
1149 | ||
1150 | If nobody answers, mbone does not work. | |
1151 | ||
1152 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1153 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1154 | ifconfig Universe up | |
1155 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1156 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1157 | ftp 10.66.66.66 | |
1158 | ... | |
1159 | ftp fec0:6666:6666::193.233.7.65 | |
1160 | ... | |
1161 | ||
1162 | */ | |
1163 | ||
3b04ddde SH |
1164 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1165 | unsigned short type, | |
1507850b | 1166 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 1167 | { |
2941a486 | 1168 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1169 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1170 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1171 | |
1172 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1173 | p[0] = t->parms.o_flags; | |
1174 | p[1] = htons(type); | |
1175 | ||
1176 | /* | |
e905a9ed | 1177 | * Set the source hardware address. |
1da177e4 | 1178 | */ |
e905a9ed | 1179 | |
1da177e4 LT |
1180 | if (saddr) |
1181 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 1182 | if (daddr) |
1da177e4 | 1183 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 1184 | if (iph->daddr) |
1da177e4 | 1185 | return t->hlen; |
e905a9ed | 1186 | |
1da177e4 LT |
1187 | return -t->hlen; |
1188 | } | |
1189 | ||
6a5f44d7 TT |
1190 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1191 | { | |
b71d1d42 | 1192 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1193 | memcpy(haddr, &iph->saddr, 4); |
1194 | return 4; | |
1195 | } | |
1196 | ||
3b04ddde SH |
1197 | static const struct header_ops ipgre_header_ops = { |
1198 | .create = ipgre_header, | |
6a5f44d7 | 1199 | .parse = ipgre_header_parse, |
3b04ddde SH |
1200 | }; |
1201 | ||
6a5f44d7 | 1202 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1203 | static int ipgre_open(struct net_device *dev) |
1204 | { | |
2941a486 | 1205 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1206 | |
f97c1e0c | 1207 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
1208 | struct flowi4 fl4; |
1209 | struct rtable *rt; | |
1210 | ||
1211 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
1212 | t->parms.iph.daddr, | |
1213 | t->parms.iph.saddr, | |
1214 | t->parms.o_key, | |
1215 | RT_TOS(t->parms.iph.tos), | |
1216 | t->parms.link); | |
b23dd4fe | 1217 | if (IS_ERR(rt)) |
1da177e4 | 1218 | return -EADDRNOTAVAIL; |
d8d1f30b | 1219 | dev = rt->dst.dev; |
1da177e4 | 1220 | ip_rt_put(rt); |
e5ed6399 | 1221 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1222 | return -EADDRNOTAVAIL; |
1223 | t->mlink = dev->ifindex; | |
e5ed6399 | 1224 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1225 | } |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static int ipgre_close(struct net_device *dev) | |
1230 | { | |
2941a486 | 1231 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1232 | |
f97c1e0c | 1233 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1234 | struct in_device *in_dev; |
c346dca1 | 1235 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
8723e1b4 | 1236 | if (in_dev) |
1da177e4 | 1237 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
1238 | } |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | #endif | |
1243 | ||
b8c26a33 SH |
1244 | static const struct net_device_ops ipgre_netdev_ops = { |
1245 | .ndo_init = ipgre_tunnel_init, | |
1246 | .ndo_uninit = ipgre_tunnel_uninit, | |
1247 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1248 | .ndo_open = ipgre_open, | |
1249 | .ndo_stop = ipgre_close, | |
1250 | #endif | |
1251 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1252 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1253 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
e985aad7 | 1254 | .ndo_get_stats = ipgre_get_stats, |
b8c26a33 SH |
1255 | }; |
1256 | ||
e985aad7 ED |
1257 | static void ipgre_dev_free(struct net_device *dev) |
1258 | { | |
1259 | free_percpu(dev->tstats); | |
1260 | free_netdev(dev); | |
1261 | } | |
1262 | ||
1da177e4 LT |
1263 | static void ipgre_tunnel_setup(struct net_device *dev) |
1264 | { | |
b8c26a33 | 1265 | dev->netdev_ops = &ipgre_netdev_ops; |
e985aad7 | 1266 | dev->destructor = ipgre_dev_free; |
1da177e4 LT |
1267 | |
1268 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1269 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1270 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1271 | dev->flags = IFF_NOARP; |
1272 | dev->iflink = 0; | |
1273 | dev->addr_len = 4; | |
0b67eceb | 1274 | dev->features |= NETIF_F_NETNS_LOCAL; |
108bfa89 | 1275 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1276 | } |
1277 | ||
1278 | static int ipgre_tunnel_init(struct net_device *dev) | |
1279 | { | |
1da177e4 LT |
1280 | struct ip_tunnel *tunnel; |
1281 | struct iphdr *iph; | |
1da177e4 | 1282 | |
2941a486 | 1283 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1284 | iph = &tunnel->parms.iph; |
1285 | ||
1286 | tunnel->dev = dev; | |
1287 | strcpy(tunnel->parms.name, dev->name); | |
1288 | ||
1289 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1290 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1291 | ||
1da177e4 | 1292 | if (iph->daddr) { |
1da177e4 | 1293 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1294 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1295 | if (!iph->saddr) |
1296 | return -EINVAL; | |
1297 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1298 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1299 | } |
1300 | #endif | |
ee34c1eb | 1301 | } else |
6a5f44d7 | 1302 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1303 | |
e985aad7 ED |
1304 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1305 | if (!dev->tstats) | |
1306 | return -ENOMEM; | |
1307 | ||
1da177e4 LT |
1308 | return 0; |
1309 | } | |
1310 | ||
b8c26a33 | 1311 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1312 | { |
2941a486 | 1313 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1314 | struct iphdr *iph = &tunnel->parms.iph; |
1315 | ||
1316 | tunnel->dev = dev; | |
1317 | strcpy(tunnel->parms.name, dev->name); | |
1318 | ||
1319 | iph->version = 4; | |
1320 | iph->protocol = IPPROTO_GRE; | |
1321 | iph->ihl = 5; | |
1322 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1323 | ||
1324 | dev_hold(dev); | |
1da177e4 LT |
1325 | } |
1326 | ||
1327 | ||
00959ade DK |
1328 | static const struct gre_protocol ipgre_protocol = { |
1329 | .handler = ipgre_rcv, | |
1330 | .err_handler = ipgre_err, | |
1da177e4 LT |
1331 | }; |
1332 | ||
eef6dd65 | 1333 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
eb8ce741 PE |
1334 | { |
1335 | int prio; | |
1336 | ||
1337 | for (prio = 0; prio < 4; prio++) { | |
1338 | int h; | |
1339 | for (h = 0; h < HASH_SIZE; h++) { | |
1507850b ED |
1340 | struct ip_tunnel *t; |
1341 | ||
1342 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
eef6dd65 ED |
1343 | |
1344 | while (t != NULL) { | |
1345 | unregister_netdevice_queue(t->dev, head); | |
1507850b | 1346 | t = rtnl_dereference(t->next); |
eef6dd65 | 1347 | } |
eb8ce741 PE |
1348 | } |
1349 | } | |
1350 | } | |
1351 | ||
2c8c1e72 | 1352 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1353 | { |
cfb8fbf2 | 1354 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
59a4c759 | 1355 | int err; |
59a4c759 | 1356 | |
7daa0004 PE |
1357 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1358 | ipgre_tunnel_setup); | |
1359 | if (!ign->fb_tunnel_dev) { | |
1360 | err = -ENOMEM; | |
1361 | goto err_alloc_dev; | |
1362 | } | |
be77e593 | 1363 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1364 | |
b8c26a33 | 1365 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1366 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1367 | |
1368 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1369 | goto err_reg_dev; | |
1370 | ||
3285ee3b ED |
1371 | rcu_assign_pointer(ign->tunnels_wc[0], |
1372 | netdev_priv(ign->fb_tunnel_dev)); | |
59a4c759 PE |
1373 | return 0; |
1374 | ||
7daa0004 | 1375 | err_reg_dev: |
3285ee3b | 1376 | ipgre_dev_free(ign->fb_tunnel_dev); |
7daa0004 | 1377 | err_alloc_dev: |
59a4c759 PE |
1378 | return err; |
1379 | } | |
1380 | ||
2c8c1e72 | 1381 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 PE |
1382 | { |
1383 | struct ipgre_net *ign; | |
eef6dd65 | 1384 | LIST_HEAD(list); |
59a4c759 PE |
1385 | |
1386 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1387 | rtnl_lock(); |
eef6dd65 ED |
1388 | ipgre_destroy_tunnels(ign, &list); |
1389 | unregister_netdevice_many(&list); | |
7daa0004 | 1390 | rtnl_unlock(); |
59a4c759 PE |
1391 | } |
1392 | ||
1393 | static struct pernet_operations ipgre_net_ops = { | |
1394 | .init = ipgre_init_net, | |
1395 | .exit = ipgre_exit_net, | |
cfb8fbf2 EB |
1396 | .id = &ipgre_net_id, |
1397 | .size = sizeof(struct ipgre_net), | |
59a4c759 | 1398 | }; |
1da177e4 | 1399 | |
c19e654d HX |
1400 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1401 | { | |
1402 | __be16 flags; | |
1403 | ||
1404 | if (!data) | |
1405 | return 0; | |
1406 | ||
1407 | flags = 0; | |
1408 | if (data[IFLA_GRE_IFLAGS]) | |
1409 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1410 | if (data[IFLA_GRE_OFLAGS]) | |
1411 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1412 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1413 | return -EINVAL; | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
e1a80002 HX |
1418 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1419 | { | |
1420 | __be32 daddr; | |
1421 | ||
1422 | if (tb[IFLA_ADDRESS]) { | |
1423 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1424 | return -EINVAL; | |
1425 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1426 | return -EADDRNOTAVAIL; | |
1427 | } | |
1428 | ||
1429 | if (!data) | |
1430 | goto out; | |
1431 | ||
1432 | if (data[IFLA_GRE_REMOTE]) { | |
1433 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1434 | if (!daddr) | |
1435 | return -EINVAL; | |
1436 | } | |
1437 | ||
1438 | out: | |
1439 | return ipgre_tunnel_validate(tb, data); | |
1440 | } | |
1441 | ||
c19e654d HX |
1442 | static void ipgre_netlink_parms(struct nlattr *data[], |
1443 | struct ip_tunnel_parm *parms) | |
1444 | { | |
7bb82d92 | 1445 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1446 | |
1447 | parms->iph.protocol = IPPROTO_GRE; | |
1448 | ||
1449 | if (!data) | |
1450 | return; | |
1451 | ||
1452 | if (data[IFLA_GRE_LINK]) | |
1453 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1454 | ||
1455 | if (data[IFLA_GRE_IFLAGS]) | |
1456 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1457 | ||
1458 | if (data[IFLA_GRE_OFLAGS]) | |
1459 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1460 | ||
1461 | if (data[IFLA_GRE_IKEY]) | |
1462 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1463 | ||
1464 | if (data[IFLA_GRE_OKEY]) | |
1465 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1466 | ||
1467 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1468 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1469 | |
1470 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1471 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1472 | |
1473 | if (data[IFLA_GRE_TTL]) | |
1474 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1475 | ||
1476 | if (data[IFLA_GRE_TOS]) | |
1477 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1478 | ||
1479 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1480 | parms->iph.frag_off = htons(IP_DF); | |
1481 | } | |
1482 | ||
e1a80002 HX |
1483 | static int ipgre_tap_init(struct net_device *dev) |
1484 | { | |
1485 | struct ip_tunnel *tunnel; | |
1486 | ||
1487 | tunnel = netdev_priv(dev); | |
1488 | ||
1489 | tunnel->dev = dev; | |
1490 | strcpy(tunnel->parms.name, dev->name); | |
1491 | ||
1492 | ipgre_tunnel_bind_dev(dev); | |
1493 | ||
e985aad7 ED |
1494 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1495 | if (!dev->tstats) | |
1496 | return -ENOMEM; | |
1497 | ||
e1a80002 HX |
1498 | return 0; |
1499 | } | |
1500 | ||
b8c26a33 SH |
1501 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1502 | .ndo_init = ipgre_tap_init, | |
1503 | .ndo_uninit = ipgre_tunnel_uninit, | |
1504 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1505 | .ndo_set_mac_address = eth_mac_addr, | |
1506 | .ndo_validate_addr = eth_validate_addr, | |
1507 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
e985aad7 | 1508 | .ndo_get_stats = ipgre_get_stats, |
b8c26a33 SH |
1509 | }; |
1510 | ||
e1a80002 HX |
1511 | static void ipgre_tap_setup(struct net_device *dev) |
1512 | { | |
1513 | ||
1514 | ether_setup(dev); | |
1515 | ||
2e9526b3 | 1516 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
e985aad7 | 1517 | dev->destructor = ipgre_dev_free; |
e1a80002 HX |
1518 | |
1519 | dev->iflink = 0; | |
1520 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1521 | } | |
1522 | ||
81adee47 | 1523 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
c19e654d HX |
1524 | struct nlattr *data[]) |
1525 | { | |
1526 | struct ip_tunnel *nt; | |
1527 | struct net *net = dev_net(dev); | |
1528 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1529 | int mtu; | |
1530 | int err; | |
1531 | ||
1532 | nt = netdev_priv(dev); | |
1533 | ipgre_netlink_parms(data, &nt->parms); | |
1534 | ||
e1a80002 | 1535 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1536 | return -EEXIST; |
1537 | ||
e1a80002 | 1538 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
f2cedb63 | 1539 | eth_hw_addr_random(dev); |
e1a80002 | 1540 | |
c19e654d HX |
1541 | mtu = ipgre_tunnel_bind_dev(dev); |
1542 | if (!tb[IFLA_MTU]) | |
1543 | dev->mtu = mtu; | |
1544 | ||
b790e01a ED |
1545 | /* Can use a lockless transmit, unless we generate output sequences */ |
1546 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1547 | dev->features |= NETIF_F_LLTX; | |
1548 | ||
c19e654d HX |
1549 | err = register_netdevice(dev); |
1550 | if (err) | |
1551 | goto out; | |
1552 | ||
1553 | dev_hold(dev); | |
1554 | ipgre_tunnel_link(ign, nt); | |
1555 | ||
1556 | out: | |
1557 | return err; | |
1558 | } | |
1559 | ||
1560 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1561 | struct nlattr *data[]) | |
1562 | { | |
1563 | struct ip_tunnel *t, *nt; | |
1564 | struct net *net = dev_net(dev); | |
1565 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1566 | struct ip_tunnel_parm p; | |
1567 | int mtu; | |
1568 | ||
1569 | if (dev == ign->fb_tunnel_dev) | |
1570 | return -EINVAL; | |
1571 | ||
1572 | nt = netdev_priv(dev); | |
1573 | ipgre_netlink_parms(data, &p); | |
1574 | ||
1575 | t = ipgre_tunnel_locate(net, &p, 0); | |
1576 | ||
1577 | if (t) { | |
1578 | if (t->dev != dev) | |
1579 | return -EEXIST; | |
1580 | } else { | |
c19e654d HX |
1581 | t = nt; |
1582 | ||
2e9526b3 | 1583 | if (dev->type != ARPHRD_ETHER) { |
1507850b | 1584 | unsigned int nflags = 0; |
c19e654d | 1585 | |
2e9526b3 HX |
1586 | if (ipv4_is_multicast(p.iph.daddr)) |
1587 | nflags = IFF_BROADCAST; | |
1588 | else if (p.iph.daddr) | |
1589 | nflags = IFF_POINTOPOINT; | |
1590 | ||
1591 | if ((dev->flags ^ nflags) & | |
1592 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1593 | return -EINVAL; | |
1594 | } | |
c19e654d HX |
1595 | |
1596 | ipgre_tunnel_unlink(ign, t); | |
1597 | t->parms.iph.saddr = p.iph.saddr; | |
1598 | t->parms.iph.daddr = p.iph.daddr; | |
1599 | t->parms.i_key = p.i_key; | |
2e9526b3 HX |
1600 | if (dev->type != ARPHRD_ETHER) { |
1601 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1602 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1603 | } | |
c19e654d HX |
1604 | ipgre_tunnel_link(ign, t); |
1605 | netdev_state_change(dev); | |
1606 | } | |
1607 | ||
1608 | t->parms.o_key = p.o_key; | |
1609 | t->parms.iph.ttl = p.iph.ttl; | |
1610 | t->parms.iph.tos = p.iph.tos; | |
1611 | t->parms.iph.frag_off = p.iph.frag_off; | |
1612 | ||
1613 | if (t->parms.link != p.link) { | |
1614 | t->parms.link = p.link; | |
1615 | mtu = ipgre_tunnel_bind_dev(dev); | |
1616 | if (!tb[IFLA_MTU]) | |
1617 | dev->mtu = mtu; | |
1618 | netdev_state_change(dev); | |
1619 | } | |
1620 | ||
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | static size_t ipgre_get_size(const struct net_device *dev) | |
1625 | { | |
1626 | return | |
1627 | /* IFLA_GRE_LINK */ | |
1628 | nla_total_size(4) + | |
1629 | /* IFLA_GRE_IFLAGS */ | |
1630 | nla_total_size(2) + | |
1631 | /* IFLA_GRE_OFLAGS */ | |
1632 | nla_total_size(2) + | |
1633 | /* IFLA_GRE_IKEY */ | |
1634 | nla_total_size(4) + | |
1635 | /* IFLA_GRE_OKEY */ | |
1636 | nla_total_size(4) + | |
1637 | /* IFLA_GRE_LOCAL */ | |
1638 | nla_total_size(4) + | |
1639 | /* IFLA_GRE_REMOTE */ | |
1640 | nla_total_size(4) + | |
1641 | /* IFLA_GRE_TTL */ | |
1642 | nla_total_size(1) + | |
1643 | /* IFLA_GRE_TOS */ | |
1644 | nla_total_size(1) + | |
1645 | /* IFLA_GRE_PMTUDISC */ | |
1646 | nla_total_size(1) + | |
1647 | 0; | |
1648 | } | |
1649 | ||
1650 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1651 | { | |
1652 | struct ip_tunnel *t = netdev_priv(dev); | |
1653 | struct ip_tunnel_parm *p = &t->parms; | |
1654 | ||
1655 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1656 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1657 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
ba9e64b1 PM |
1658 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
1659 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); | |
4d74f8ba PM |
1660 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
1661 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); | |
c19e654d HX |
1662 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
1663 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1664 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1665 | ||
1666 | return 0; | |
1667 | ||
1668 | nla_put_failure: | |
1669 | return -EMSGSIZE; | |
1670 | } | |
1671 | ||
1672 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1673 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1674 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1675 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1676 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1677 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1678 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1679 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1680 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1681 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1682 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1683 | }; | |
1684 | ||
1685 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1686 | .kind = "gre", | |
1687 | .maxtype = IFLA_GRE_MAX, | |
1688 | .policy = ipgre_policy, | |
1689 | .priv_size = sizeof(struct ip_tunnel), | |
1690 | .setup = ipgre_tunnel_setup, | |
1691 | .validate = ipgre_tunnel_validate, | |
1692 | .newlink = ipgre_newlink, | |
1693 | .changelink = ipgre_changelink, | |
1694 | .get_size = ipgre_get_size, | |
1695 | .fill_info = ipgre_fill_info, | |
1696 | }; | |
1697 | ||
e1a80002 HX |
1698 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1699 | .kind = "gretap", | |
1700 | .maxtype = IFLA_GRE_MAX, | |
1701 | .policy = ipgre_policy, | |
1702 | .priv_size = sizeof(struct ip_tunnel), | |
1703 | .setup = ipgre_tap_setup, | |
1704 | .validate = ipgre_tap_validate, | |
1705 | .newlink = ipgre_newlink, | |
1706 | .changelink = ipgre_changelink, | |
1707 | .get_size = ipgre_get_size, | |
1708 | .fill_info = ipgre_fill_info, | |
1709 | }; | |
1710 | ||
1da177e4 LT |
1711 | /* |
1712 | * And now the modules code and kernel interface. | |
1713 | */ | |
1714 | ||
1715 | static int __init ipgre_init(void) | |
1716 | { | |
1717 | int err; | |
1718 | ||
1719 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1720 | ||
cfb8fbf2 | 1721 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1722 | if (err < 0) |
c2892f02 AD |
1723 | return err; |
1724 | ||
00959ade | 1725 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1726 | if (err < 0) { |
1727 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1728 | goto add_proto_failed; | |
1729 | } | |
7daa0004 | 1730 | |
c19e654d HX |
1731 | err = rtnl_link_register(&ipgre_link_ops); |
1732 | if (err < 0) | |
1733 | goto rtnl_link_failed; | |
1734 | ||
e1a80002 HX |
1735 | err = rtnl_link_register(&ipgre_tap_ops); |
1736 | if (err < 0) | |
1737 | goto tap_ops_failed; | |
1738 | ||
c19e654d | 1739 | out: |
1da177e4 | 1740 | return err; |
c19e654d | 1741 | |
e1a80002 HX |
1742 | tap_ops_failed: |
1743 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1744 | rtnl_link_failed: |
00959ade | 1745 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1746 | add_proto_failed: |
1747 | unregister_pernet_device(&ipgre_net_ops); | |
c19e654d | 1748 | goto out; |
1da177e4 LT |
1749 | } |
1750 | ||
db44575f | 1751 | static void __exit ipgre_fini(void) |
1da177e4 | 1752 | { |
e1a80002 | 1753 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1754 | rtnl_link_unregister(&ipgre_link_ops); |
00959ade | 1755 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
1da177e4 | 1756 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); |
c2892f02 | 1757 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | module_init(ipgre_init); | |
1761 | module_exit(ipgre_fini); | |
1762 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1763 | MODULE_ALIAS_RTNL_LINK("gre"); |
1764 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1765 | MODULE_ALIAS_NETDEV("gre0"); |