]>
Commit | Line | Data |
---|---|---|
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 | |
842c74bf | 49 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
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), | |
67 | and silently drop packet when it expires. It is the best | |
68 | solution, but it supposes maintaing new variable in ALL | |
69 | skb, even if no tunneling is used. | |
70 | ||
a43912ab | 71 | Current solution: HARD_TX_LOCK lock breaks dead loops. |
1da177e4 LT |
72 | |
73 | ||
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 LT |
167 | |
168 | /* Given src, dst and key, find appropriate for input tunnel. */ | |
169 | ||
749c10f9 | 170 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev, |
e1a80002 HX |
171 | __be32 remote, __be32 local, |
172 | __be32 key, __be16 gre_proto) | |
1da177e4 | 173 | { |
749c10f9 TT |
174 | struct net *net = dev_net(dev); |
175 | int link = dev->ifindex; | |
1507850b ED |
176 | unsigned int h0 = HASH(remote); |
177 | unsigned int h1 = HASH(key); | |
afcf1242 | 178 | struct ip_tunnel *t, *cand = NULL; |
7daa0004 | 179 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
180 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
181 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
afcf1242 | 182 | int score, cand_score = 4; |
1da177e4 | 183 | |
8d5b2c08 | 184 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
749c10f9 TT |
185 | if (local != t->parms.iph.saddr || |
186 | remote != t->parms.iph.daddr || | |
187 | key != t->parms.i_key || | |
188 | !(t->dev->flags & IFF_UP)) | |
189 | continue; | |
190 | ||
191 | if (t->dev->type != ARPHRD_IPGRE && | |
192 | t->dev->type != dev_type) | |
193 | continue; | |
194 | ||
afcf1242 | 195 | score = 0; |
749c10f9 | 196 | if (t->parms.link != link) |
afcf1242 | 197 | score |= 1; |
749c10f9 | 198 | if (t->dev->type != dev_type) |
afcf1242 TT |
199 | score |= 2; |
200 | if (score == 0) | |
749c10f9 | 201 | return t; |
afcf1242 TT |
202 | |
203 | if (score < cand_score) { | |
204 | cand = t; | |
205 | cand_score = score; | |
206 | } | |
1da177e4 | 207 | } |
e1a80002 | 208 | |
8d5b2c08 | 209 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
749c10f9 TT |
210 | if (remote != t->parms.iph.daddr || |
211 | key != t->parms.i_key || | |
212 | !(t->dev->flags & IFF_UP)) | |
213 | continue; | |
214 | ||
215 | if (t->dev->type != ARPHRD_IPGRE && | |
216 | t->dev->type != dev_type) | |
217 | continue; | |
218 | ||
afcf1242 | 219 | score = 0; |
749c10f9 | 220 | if (t->parms.link != link) |
afcf1242 | 221 | score |= 1; |
749c10f9 | 222 | if (t->dev->type != dev_type) |
afcf1242 TT |
223 | score |= 2; |
224 | if (score == 0) | |
749c10f9 | 225 | return t; |
afcf1242 TT |
226 | |
227 | if (score < cand_score) { | |
228 | cand = t; | |
229 | cand_score = score; | |
230 | } | |
1da177e4 | 231 | } |
e1a80002 | 232 | |
8d5b2c08 | 233 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
749c10f9 TT |
234 | if ((local != t->parms.iph.saddr && |
235 | (local != t->parms.iph.daddr || | |
236 | !ipv4_is_multicast(local))) || | |
237 | key != t->parms.i_key || | |
238 | !(t->dev->flags & IFF_UP)) | |
239 | continue; | |
240 | ||
241 | if (t->dev->type != ARPHRD_IPGRE && | |
242 | t->dev->type != dev_type) | |
243 | continue; | |
244 | ||
afcf1242 | 245 | score = 0; |
749c10f9 | 246 | if (t->parms.link != link) |
afcf1242 | 247 | score |= 1; |
749c10f9 | 248 | if (t->dev->type != dev_type) |
afcf1242 TT |
249 | score |= 2; |
250 | if (score == 0) | |
749c10f9 | 251 | return t; |
afcf1242 TT |
252 | |
253 | if (score < cand_score) { | |
254 | cand = t; | |
255 | cand_score = score; | |
256 | } | |
1da177e4 | 257 | } |
e1a80002 | 258 | |
8d5b2c08 | 259 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
749c10f9 TT |
260 | if (t->parms.i_key != 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 LT |
280 | } |
281 | ||
afcf1242 TT |
282 | if (cand != NULL) |
283 | return cand; | |
e1a80002 | 284 | |
8d5b2c08 ED |
285 | dev = ign->fb_tunnel_dev; |
286 | if (dev->flags & IFF_UP) | |
287 | return netdev_priv(dev); | |
749c10f9 | 288 | |
1da177e4 LT |
289 | return NULL; |
290 | } | |
291 | ||
1507850b | 292 | static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 293 | struct ip_tunnel_parm *parms) |
1da177e4 | 294 | { |
5056a1ef YH |
295 | __be32 remote = parms->iph.daddr; |
296 | __be32 local = parms->iph.saddr; | |
297 | __be32 key = parms->i_key; | |
1507850b | 298 | unsigned int h = HASH(key); |
1da177e4 LT |
299 | int prio = 0; |
300 | ||
301 | if (local) | |
302 | prio |= 1; | |
f97c1e0c | 303 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
304 | prio |= 2; |
305 | h ^= HASH(remote); | |
306 | } | |
307 | ||
eb8ce741 | 308 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
309 | } |
310 | ||
1507850b | 311 | static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 312 | struct ip_tunnel *t) |
5056a1ef | 313 | { |
f57e7d5a | 314 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
315 | } |
316 | ||
f57e7d5a | 317 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 318 | { |
1507850b | 319 | struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t); |
1da177e4 | 320 | |
1507850b | 321 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
8d5b2c08 | 322 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
323 | } |
324 | ||
f57e7d5a | 325 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 326 | { |
1507850b ED |
327 | struct ip_tunnel __rcu **tp; |
328 | struct ip_tunnel *iter; | |
329 | ||
330 | for (tp = ipgre_bucket(ign, t); | |
331 | (iter = rtnl_dereference(*tp)) != NULL; | |
332 | tp = &iter->next) { | |
333 | if (t == iter) { | |
334 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
335 | break; |
336 | } | |
337 | } | |
338 | } | |
339 | ||
e1a80002 HX |
340 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
341 | struct ip_tunnel_parm *parms, | |
342 | int type) | |
1da177e4 | 343 | { |
d5a0a1e3 AV |
344 | __be32 remote = parms->iph.daddr; |
345 | __be32 local = parms->iph.saddr; | |
346 | __be32 key = parms->i_key; | |
749c10f9 | 347 | int link = parms->link; |
1507850b ED |
348 | struct ip_tunnel *t; |
349 | struct ip_tunnel __rcu **tp; | |
e1a80002 HX |
350 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
351 | ||
1507850b ED |
352 | for (tp = __ipgre_bucket(ign, parms); |
353 | (t = rtnl_dereference(*tp)) != NULL; | |
354 | tp = &t->next) | |
e1a80002 HX |
355 | if (local == t->parms.iph.saddr && |
356 | remote == t->parms.iph.daddr && | |
357 | key == t->parms.i_key && | |
749c10f9 | 358 | link == t->parms.link && |
e1a80002 HX |
359 | type == t->dev->type) |
360 | break; | |
361 | ||
362 | return t; | |
363 | } | |
364 | ||
1507850b | 365 | static struct ip_tunnel *ipgre_tunnel_locate(struct net *net, |
e1a80002 HX |
366 | struct ip_tunnel_parm *parms, int create) |
367 | { | |
368 | struct ip_tunnel *t, *nt; | |
1da177e4 | 369 | struct net_device *dev; |
1da177e4 | 370 | char name[IFNAMSIZ]; |
f57e7d5a | 371 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 372 | |
e1a80002 HX |
373 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
374 | if (t || !create) | |
375 | return t; | |
1da177e4 LT |
376 | |
377 | if (parms->name[0]) | |
378 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
379 | else |
380 | sprintf(name, "gre%%d"); | |
1da177e4 LT |
381 | |
382 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
383 | if (!dev) | |
384 | return NULL; | |
385 | ||
0b67eceb PE |
386 | dev_net_set(dev, net); |
387 | ||
b37d428b PE |
388 | if (strchr(name, '%')) { |
389 | if (dev_alloc_name(dev, name) < 0) | |
390 | goto failed_free; | |
391 | } | |
392 | ||
2941a486 | 393 | nt = netdev_priv(dev); |
1da177e4 | 394 | nt->parms = *parms; |
c19e654d | 395 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 396 | |
42aa9162 HX |
397 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
398 | ||
b37d428b PE |
399 | if (register_netdevice(dev) < 0) |
400 | goto failed_free; | |
1da177e4 | 401 | |
1da177e4 | 402 | dev_hold(dev); |
f57e7d5a | 403 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
404 | return nt; |
405 | ||
b37d428b PE |
406 | failed_free: |
407 | free_netdev(dev); | |
1da177e4 LT |
408 | return NULL; |
409 | } | |
410 | ||
411 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
412 | { | |
f57e7d5a PE |
413 | struct net *net = dev_net(dev); |
414 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
415 | ||
416 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
417 | dev_put(dev); |
418 | } | |
419 | ||
420 | ||
421 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
422 | { | |
1da177e4 | 423 | |
071f92d0 | 424 | /* All the routers (except for Linux) return only |
1da177e4 LT |
425 | 8 bytes of packet payload. It means, that precise relaying of |
426 | ICMP in the real Internet is absolutely infeasible. | |
427 | ||
428 | Moreover, Cisco "wise men" put GRE key to the third word | |
429 | in GRE header. It makes impossible maintaining even soft state for keyed | |
430 | GRE tunnels with enabled checksum. Tell them "thank you". | |
431 | ||
432 | Well, I wonder, rfc1812 was written by Cisco employee, | |
433 | what the hell these idiots break standrads established | |
434 | by themself??? | |
435 | */ | |
436 | ||
6ed2533e | 437 | struct iphdr *iph = (struct iphdr *)skb->data; |
d5a0a1e3 | 438 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 439 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
440 | const int type = icmp_hdr(skb)->type; |
441 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 442 | struct ip_tunnel *t; |
d5a0a1e3 | 443 | __be16 flags; |
1da177e4 LT |
444 | |
445 | flags = p[0]; | |
446 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
447 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
448 | return; | |
449 | if (flags&GRE_KEY) { | |
450 | grehlen += 4; | |
451 | if (flags&GRE_CSUM) | |
452 | grehlen += 4; | |
453 | } | |
454 | } | |
455 | ||
456 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
457 | if (skb_headlen(skb) < grehlen) | |
458 | return; | |
459 | ||
460 | switch (type) { | |
461 | default: | |
462 | case ICMP_PARAMETERPROB: | |
463 | return; | |
464 | ||
465 | case ICMP_DEST_UNREACH: | |
466 | switch (code) { | |
467 | case ICMP_SR_FAILED: | |
468 | case ICMP_PORT_UNREACH: | |
469 | /* Impossible event. */ | |
470 | return; | |
471 | case ICMP_FRAG_NEEDED: | |
472 | /* Soft state for pmtu is maintained by IP core. */ | |
473 | return; | |
474 | default: | |
475 | /* All others are translated to HOST_UNREACH. | |
476 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
477 | I believe they are just ether pollution. --ANK | |
478 | */ | |
479 | break; | |
480 | } | |
481 | break; | |
482 | case ICMP_TIME_EXCEEDED: | |
483 | if (code != ICMP_EXC_TTL) | |
484 | return; | |
485 | break; | |
486 | } | |
487 | ||
8d5b2c08 | 488 | rcu_read_lock(); |
749c10f9 | 489 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
490 | flags & GRE_KEY ? |
491 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
492 | p[1]); | |
f97c1e0c JP |
493 | if (t == NULL || t->parms.iph.daddr == 0 || |
494 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
495 | goto out; |
496 | ||
497 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
498 | goto out; | |
499 | ||
da6185d8 | 500 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
501 | t->err_count++; |
502 | else | |
503 | t->err_count = 1; | |
504 | t->err_time = jiffies; | |
505 | out: | |
8d5b2c08 | 506 | rcu_read_unlock(); |
1da177e4 LT |
507 | } |
508 | ||
509 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
510 | { | |
511 | if (INET_ECN_is_ce(iph->tos)) { | |
512 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 513 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 514 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 515 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
516 | } |
517 | } | |
518 | } | |
519 | ||
520 | static inline u8 | |
521 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) | |
522 | { | |
523 | u8 inner = 0; | |
524 | if (skb->protocol == htons(ETH_P_IP)) | |
525 | inner = old_iph->tos; | |
526 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
527 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); | |
528 | return INET_ECN_encapsulate(tos, inner); | |
529 | } | |
530 | ||
531 | static int ipgre_rcv(struct sk_buff *skb) | |
532 | { | |
533 | struct iphdr *iph; | |
534 | u8 *h; | |
d5a0a1e3 | 535 | __be16 flags; |
d3bc23e7 | 536 | __sum16 csum = 0; |
d5a0a1e3 | 537 | __be32 key = 0; |
1da177e4 LT |
538 | u32 seqno = 0; |
539 | struct ip_tunnel *tunnel; | |
540 | int offset = 4; | |
e1a80002 | 541 | __be16 gre_proto; |
1da177e4 LT |
542 | |
543 | if (!pskb_may_pull(skb, 16)) | |
544 | goto drop_nolock; | |
545 | ||
eddc9ec5 | 546 | iph = ip_hdr(skb); |
1da177e4 | 547 | h = skb->data; |
d5a0a1e3 | 548 | flags = *(__be16*)h; |
1da177e4 LT |
549 | |
550 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
551 | /* - Version must be 0. | |
552 | - We do not support routing headers. | |
553 | */ | |
554 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
555 | goto drop_nolock; | |
556 | ||
557 | if (flags&GRE_CSUM) { | |
fb286bb2 | 558 | switch (skb->ip_summed) { |
84fa7933 | 559 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 560 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
561 | if (!csum) |
562 | break; | |
563 | /* fall through */ | |
564 | case CHECKSUM_NONE: | |
565 | skb->csum = 0; | |
566 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 567 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
568 | } |
569 | offset += 4; | |
570 | } | |
571 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 572 | key = *(__be32*)(h + offset); |
1da177e4 LT |
573 | offset += 4; |
574 | } | |
575 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 576 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
577 | offset += 4; |
578 | } | |
579 | } | |
580 | ||
e1a80002 HX |
581 | gre_proto = *(__be16 *)(h + 2); |
582 | ||
8d5b2c08 | 583 | rcu_read_lock(); |
749c10f9 | 584 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
585 | iph->saddr, iph->daddr, key, |
586 | gre_proto))) { | |
addd68eb PE |
587 | struct net_device_stats *stats = &tunnel->dev->stats; |
588 | ||
1da177e4 LT |
589 | secpath_reset(skb); |
590 | ||
e1a80002 | 591 | skb->protocol = gre_proto; |
1da177e4 LT |
592 | /* WCCP version 1 and 2 protocol decoding. |
593 | * - Change protocol to IP | |
594 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
595 | */ | |
e1a80002 | 596 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 597 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 598 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
599 | offset += 4; |
600 | } | |
601 | ||
1d069167 | 602 | skb->mac_header = skb->network_header; |
4209fb60 | 603 | __pskb_pull(skb, offset); |
9c70220b | 604 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
605 | skb->pkt_type = PACKET_HOST; |
606 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 607 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 608 | /* Looped back packet, drop it! */ |
511c3f92 | 609 | if (skb_rtable(skb)->fl.iif == 0) |
1da177e4 | 610 | goto drop; |
addd68eb | 611 | stats->multicast++; |
1da177e4 LT |
612 | skb->pkt_type = PACKET_BROADCAST; |
613 | } | |
614 | #endif | |
615 | ||
616 | if (((flags&GRE_CSUM) && csum) || | |
617 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
addd68eb PE |
618 | stats->rx_crc_errors++; |
619 | stats->rx_errors++; | |
1da177e4 LT |
620 | goto drop; |
621 | } | |
622 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
623 | if (!(flags&GRE_SEQ) || | |
624 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
addd68eb PE |
625 | stats->rx_fifo_errors++; |
626 | stats->rx_errors++; | |
1da177e4 LT |
627 | goto drop; |
628 | } | |
629 | tunnel->i_seqno = seqno + 1; | |
630 | } | |
e1a80002 HX |
631 | |
632 | /* Warning: All skb pointers will be invalidated! */ | |
633 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
634 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
635 | stats->rx_length_errors++; | |
636 | stats->rx_errors++; | |
637 | goto drop; | |
638 | } | |
639 | ||
640 | iph = ip_hdr(skb); | |
641 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
642 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
643 | } | |
644 | ||
d19d56dd | 645 | skb_tunnel_rx(skb, tunnel->dev); |
e1a80002 HX |
646 | |
647 | skb_reset_network_header(skb); | |
1da177e4 | 648 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 649 | |
8990f468 ED |
650 | if (netif_rx(skb) == NET_RX_DROP) |
651 | stats->rx_dropped++; | |
652 | ||
8d5b2c08 | 653 | rcu_read_unlock(); |
8990f468 | 654 | return 0; |
1da177e4 | 655 | } |
45af08be | 656 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
657 | |
658 | drop: | |
8d5b2c08 | 659 | rcu_read_unlock(); |
1da177e4 LT |
660 | drop_nolock: |
661 | kfree_skb(skb); | |
a02cec21 | 662 | return 0; |
1da177e4 LT |
663 | } |
664 | ||
6fef4c0c | 665 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 666 | { |
2941a486 | 667 | struct ip_tunnel *tunnel = netdev_priv(dev); |
0bfbedb1 ED |
668 | struct net_device_stats *stats = &dev->stats; |
669 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
eddc9ec5 | 670 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 LT |
671 | struct iphdr *tiph; |
672 | u8 tos; | |
d5a0a1e3 | 673 | __be16 df; |
1da177e4 | 674 | struct rtable *rt; /* Route to the other host */ |
1507850b | 675 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 676 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 677 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 678 | int gre_hlen; |
d5a0a1e3 | 679 | __be32 dst; |
1da177e4 LT |
680 | int mtu; |
681 | ||
e1a80002 HX |
682 | if (dev->type == ARPHRD_ETHER) |
683 | IPCB(skb)->flags = 0; | |
684 | ||
685 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 686 | gre_hlen = 0; |
6ed2533e | 687 | tiph = (struct iphdr *)skb->data; |
1da177e4 LT |
688 | } else { |
689 | gre_hlen = tunnel->hlen; | |
690 | tiph = &tunnel->parms.iph; | |
691 | } | |
692 | ||
693 | if ((dst = tiph->daddr) == 0) { | |
694 | /* NBMA tunnel */ | |
695 | ||
adf30907 | 696 | if (skb_dst(skb) == NULL) { |
addd68eb | 697 | stats->tx_fifo_errors++; |
1da177e4 LT |
698 | goto tx_error; |
699 | } | |
700 | ||
701 | if (skb->protocol == htons(ETH_P_IP)) { | |
511c3f92 | 702 | rt = skb_rtable(skb); |
1da177e4 LT |
703 | if ((dst = rt->rt_gateway) == 0) |
704 | goto tx_error_icmp; | |
705 | } | |
842c74bf | 706 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 LT |
707 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
708 | struct in6_addr *addr6; | |
709 | int addr_type; | |
adf30907 | 710 | struct neighbour *neigh = skb_dst(skb)->neighbour; |
1da177e4 LT |
711 | |
712 | if (neigh == NULL) | |
713 | goto tx_error; | |
714 | ||
6ed2533e | 715 | addr6 = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
716 | addr_type = ipv6_addr_type(addr6); |
717 | ||
718 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 719 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
720 | addr_type = ipv6_addr_type(addr6); |
721 | } | |
722 | ||
723 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
724 | goto tx_error_icmp; | |
725 | ||
726 | dst = addr6->s6_addr32[3]; | |
727 | } | |
728 | #endif | |
729 | else | |
730 | goto tx_error; | |
731 | } | |
732 | ||
733 | tos = tiph->tos; | |
ee686ca9 AJ |
734 | if (tos == 1) { |
735 | tos = 0; | |
1da177e4 LT |
736 | if (skb->protocol == htons(ETH_P_IP)) |
737 | tos = old_iph->tos; | |
dd4ba83d SH |
738 | else if (skb->protocol == htons(ETH_P_IPV6)) |
739 | tos = ipv6_get_dsfield((struct ipv6hdr *)old_iph); | |
1da177e4 LT |
740 | } |
741 | ||
742 | { | |
743 | struct flowi fl = { .oif = tunnel->parms.link, | |
744 | .nl_u = { .ip4_u = | |
745 | { .daddr = dst, | |
746 | .saddr = tiph->saddr, | |
747 | .tos = RT_TOS(tos) } }, | |
748 | .proto = IPPROTO_GRE }; | |
96635522 | 749 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
addd68eb | 750 | stats->tx_carrier_errors++; |
1da177e4 LT |
751 | goto tx_error; |
752 | } | |
753 | } | |
d8d1f30b | 754 | tdev = rt->dst.dev; |
1da177e4 LT |
755 | |
756 | if (tdev == dev) { | |
757 | ip_rt_put(rt); | |
addd68eb | 758 | stats->collisions++; |
1da177e4 LT |
759 | goto tx_error; |
760 | } | |
761 | ||
762 | df = tiph->frag_off; | |
763 | if (df) | |
d8d1f30b | 764 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 | 765 | else |
adf30907 | 766 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 | 767 | |
adf30907 ED |
768 | if (skb_dst(skb)) |
769 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
770 | |
771 | if (skb->protocol == htons(ETH_P_IP)) { | |
772 | df |= (old_iph->frag_off&htons(IP_DF)); | |
773 | ||
774 | if ((old_iph->frag_off&htons(IP_DF)) && | |
775 | mtu < ntohs(old_iph->tot_len)) { | |
776 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
777 | ip_rt_put(rt); | |
778 | goto tx_error; | |
779 | } | |
780 | } | |
842c74bf | 781 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 782 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
adf30907 | 783 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
1da177e4 | 784 | |
adf30907 | 785 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
f97c1e0c JP |
786 | if ((tunnel->parms.iph.daddr && |
787 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
788 | rt6->rt6i_dst.plen == 128) { |
789 | rt6->rt6i_flags |= RTF_MODIFIED; | |
adf30907 | 790 | skb_dst(skb)->metrics[RTAX_MTU-1] = mtu; |
1da177e4 LT |
791 | } |
792 | } | |
793 | ||
794 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
3ffe533c | 795 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1da177e4 LT |
796 | ip_rt_put(rt); |
797 | goto tx_error; | |
798 | } | |
799 | } | |
800 | #endif | |
801 | ||
802 | if (tunnel->err_count > 0) { | |
da6185d8 WY |
803 | if (time_before(jiffies, |
804 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
805 | tunnel->err_count--; |
806 | ||
807 | dst_link_failure(skb); | |
808 | } else | |
809 | tunnel->err_count = 0; | |
810 | } | |
811 | ||
d8d1f30b | 812 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
1da177e4 | 813 | |
cfbba49d PM |
814 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
815 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 816 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
243aad83 TT |
817 | if (max_headroom > dev->needed_headroom) |
818 | dev->needed_headroom = max_headroom; | |
1da177e4 LT |
819 | if (!new_skb) { |
820 | ip_rt_put(rt); | |
0bfbedb1 | 821 | txq->tx_dropped++; |
1da177e4 | 822 | dev_kfree_skb(skb); |
6ed10654 | 823 | return NETDEV_TX_OK; |
1da177e4 LT |
824 | } |
825 | if (skb->sk) | |
826 | skb_set_owner_w(new_skb, skb->sk); | |
827 | dev_kfree_skb(skb); | |
828 | skb = new_skb; | |
eddc9ec5 | 829 | old_iph = ip_hdr(skb); |
1da177e4 LT |
830 | } |
831 | ||
64194c31 | 832 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
833 | skb_push(skb, gre_hlen); |
834 | skb_reset_network_header(skb); | |
1da177e4 | 835 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
836 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
837 | IPSKB_REROUTED); | |
adf30907 | 838 | skb_dst_drop(skb); |
d8d1f30b | 839 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
840 | |
841 | /* | |
842 | * Push down and install the IPIP header. | |
843 | */ | |
844 | ||
eddc9ec5 | 845 | iph = ip_hdr(skb); |
1da177e4 LT |
846 | iph->version = 4; |
847 | iph->ihl = sizeof(struct iphdr) >> 2; | |
848 | iph->frag_off = df; | |
849 | iph->protocol = IPPROTO_GRE; | |
850 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
851 | iph->daddr = rt->rt_dst; | |
852 | iph->saddr = rt->rt_src; | |
853 | ||
854 | if ((iph->ttl = tiph->ttl) == 0) { | |
855 | if (skb->protocol == htons(ETH_P_IP)) | |
856 | iph->ttl = old_iph->ttl; | |
842c74bf | 857 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 858 | else if (skb->protocol == htons(ETH_P_IPV6)) |
6ed2533e | 859 | iph->ttl = ((struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
860 | #endif |
861 | else | |
d8d1f30b | 862 | iph->ttl = dst_metric(&rt->dst, RTAX_HOPLIMIT); |
1da177e4 LT |
863 | } |
864 | ||
e1a80002 HX |
865 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
866 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
867 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
868 | |
869 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 870 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
871 | |
872 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
873 | ++tunnel->o_seqno; | |
874 | *ptr = htonl(tunnel->o_seqno); | |
875 | ptr--; | |
876 | } | |
877 | if (tunnel->parms.o_flags&GRE_KEY) { | |
878 | *ptr = tunnel->parms.o_key; | |
879 | ptr--; | |
880 | } | |
881 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
882 | *ptr = 0; | |
5f92a738 | 883 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
884 | } |
885 | } | |
886 | ||
887 | nf_reset(skb); | |
888 | ||
889 | IPTUNNEL_XMIT(); | |
6ed10654 | 890 | return NETDEV_TX_OK; |
1da177e4 LT |
891 | |
892 | tx_error_icmp: | |
893 | dst_link_failure(skb); | |
894 | ||
895 | tx_error: | |
896 | stats->tx_errors++; | |
897 | dev_kfree_skb(skb); | |
6ed10654 | 898 | return NETDEV_TX_OK; |
1da177e4 LT |
899 | } |
900 | ||
42aa9162 | 901 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
902 | { |
903 | struct net_device *tdev = NULL; | |
904 | struct ip_tunnel *tunnel; | |
905 | struct iphdr *iph; | |
906 | int hlen = LL_MAX_HEADER; | |
907 | int mtu = ETH_DATA_LEN; | |
908 | int addend = sizeof(struct iphdr) + 4; | |
909 | ||
910 | tunnel = netdev_priv(dev); | |
911 | iph = &tunnel->parms.iph; | |
912 | ||
c95b819a | 913 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
914 | |
915 | if (iph->daddr) { | |
916 | struct flowi fl = { .oif = tunnel->parms.link, | |
917 | .nl_u = { .ip4_u = | |
918 | { .daddr = iph->daddr, | |
919 | .saddr = iph->saddr, | |
920 | .tos = RT_TOS(iph->tos) } }, | |
921 | .proto = IPPROTO_GRE }; | |
922 | struct rtable *rt; | |
96635522 | 923 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
d8d1f30b | 924 | tdev = rt->dst.dev; |
ee34c1eb MS |
925 | ip_rt_put(rt); |
926 | } | |
e1a80002 HX |
927 | |
928 | if (dev->type != ARPHRD_ETHER) | |
929 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
930 | } |
931 | ||
932 | if (!tdev && tunnel->parms.link) | |
96635522 | 933 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
934 | |
935 | if (tdev) { | |
c95b819a | 936 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
937 | mtu = tdev->mtu; |
938 | } | |
939 | dev->iflink = tunnel->parms.link; | |
940 | ||
941 | /* Precalculate GRE options length */ | |
942 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
943 | if (tunnel->parms.o_flags&GRE_CSUM) | |
944 | addend += 4; | |
945 | if (tunnel->parms.o_flags&GRE_KEY) | |
946 | addend += 4; | |
947 | if (tunnel->parms.o_flags&GRE_SEQ) | |
948 | addend += 4; | |
949 | } | |
c95b819a | 950 | dev->needed_headroom = addend + hlen; |
8cdb0456 | 951 | mtu -= dev->hard_header_len + addend; |
42aa9162 HX |
952 | |
953 | if (mtu < 68) | |
954 | mtu = 68; | |
955 | ||
ee34c1eb MS |
956 | tunnel->hlen = addend; |
957 | ||
42aa9162 | 958 | return mtu; |
ee34c1eb MS |
959 | } |
960 | ||
1da177e4 LT |
961 | static int |
962 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
963 | { | |
964 | int err = 0; | |
965 | struct ip_tunnel_parm p; | |
966 | struct ip_tunnel *t; | |
f57e7d5a PE |
967 | struct net *net = dev_net(dev); |
968 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
969 | |
970 | switch (cmd) { | |
971 | case SIOCGETTUNNEL: | |
972 | t = NULL; | |
7daa0004 | 973 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
974 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
975 | err = -EFAULT; | |
976 | break; | |
977 | } | |
f57e7d5a | 978 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
979 | } |
980 | if (t == NULL) | |
2941a486 | 981 | t = netdev_priv(dev); |
1da177e4 LT |
982 | memcpy(&p, &t->parms, sizeof(p)); |
983 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
984 | err = -EFAULT; | |
985 | break; | |
986 | ||
987 | case SIOCADDTUNNEL: | |
988 | case SIOCCHGTUNNEL: | |
989 | err = -EPERM; | |
990 | if (!capable(CAP_NET_ADMIN)) | |
991 | goto done; | |
992 | ||
993 | err = -EFAULT; | |
994 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
995 | goto done; | |
996 | ||
997 | err = -EINVAL; | |
998 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
999 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
1000 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
1001 | goto done; | |
1002 | if (p.iph.ttl) | |
1003 | p.iph.frag_off |= htons(IP_DF); | |
1004 | ||
1005 | if (!(p.i_flags&GRE_KEY)) | |
1006 | p.i_key = 0; | |
1007 | if (!(p.o_flags&GRE_KEY)) | |
1008 | p.o_key = 0; | |
1009 | ||
f57e7d5a | 1010 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1011 | |
7daa0004 | 1012 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1013 | if (t != NULL) { |
1014 | if (t->dev != dev) { | |
1015 | err = -EEXIST; | |
1016 | break; | |
1017 | } | |
1018 | } else { | |
1507850b | 1019 | unsigned int nflags = 0; |
1da177e4 | 1020 | |
2941a486 | 1021 | t = netdev_priv(dev); |
1da177e4 | 1022 | |
f97c1e0c | 1023 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1024 | nflags = IFF_BROADCAST; |
1025 | else if (p.iph.daddr) | |
1026 | nflags = IFF_POINTOPOINT; | |
1027 | ||
1028 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1029 | err = -EINVAL; | |
1030 | break; | |
1031 | } | |
f57e7d5a | 1032 | ipgre_tunnel_unlink(ign, t); |
1da177e4 LT |
1033 | t->parms.iph.saddr = p.iph.saddr; |
1034 | t->parms.iph.daddr = p.iph.daddr; | |
1035 | t->parms.i_key = p.i_key; | |
1036 | t->parms.o_key = p.o_key; | |
1037 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1038 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1039 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1040 | netdev_state_change(dev); |
1041 | } | |
1042 | } | |
1043 | ||
1044 | if (t) { | |
1045 | err = 0; | |
1046 | if (cmd == SIOCCHGTUNNEL) { | |
1047 | t->parms.iph.ttl = p.iph.ttl; | |
1048 | t->parms.iph.tos = p.iph.tos; | |
1049 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1050 | if (t->parms.link != p.link) { |
1051 | t->parms.link = p.link; | |
42aa9162 | 1052 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1053 | netdev_state_change(dev); |
1054 | } | |
1da177e4 LT |
1055 | } |
1056 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1057 | err = -EFAULT; | |
1058 | } else | |
1059 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1060 | break; | |
1061 | ||
1062 | case SIOCDELTUNNEL: | |
1063 | err = -EPERM; | |
1064 | if (!capable(CAP_NET_ADMIN)) | |
1065 | goto done; | |
1066 | ||
7daa0004 | 1067 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1068 | err = -EFAULT; |
1069 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1070 | goto done; | |
1071 | err = -ENOENT; | |
f57e7d5a | 1072 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1073 | goto done; |
1074 | err = -EPERM; | |
7daa0004 | 1075 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1076 | goto done; |
1077 | dev = t->dev; | |
1078 | } | |
22f8cde5 SH |
1079 | unregister_netdevice(dev); |
1080 | err = 0; | |
1da177e4 LT |
1081 | break; |
1082 | ||
1083 | default: | |
1084 | err = -EINVAL; | |
1085 | } | |
1086 | ||
1087 | done: | |
1088 | return err; | |
1089 | } | |
1090 | ||
1da177e4 LT |
1091 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1092 | { | |
2941a486 | 1093 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1094 | if (new_mtu < 68 || |
1095 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1096 | return -EINVAL; |
1097 | dev->mtu = new_mtu; | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1da177e4 LT |
1101 | /* Nice toy. Unfortunately, useless in real life :-) |
1102 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1103 | over the Internet, provided multicast routing is tuned. | |
1104 | ||
1105 | ||
1106 | I have no idea was this bicycle invented before me, | |
1107 | so that I had to set ARPHRD_IPGRE to a random value. | |
1108 | I have an impression, that Cisco could make something similar, | |
1109 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1110 | |
1da177e4 LT |
1111 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1112 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1113 | ||
1114 | ping -t 255 224.66.66.66 | |
1115 | ||
1116 | If nobody answers, mbone does not work. | |
1117 | ||
1118 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1119 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1120 | ifconfig Universe up | |
1121 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1122 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1123 | ftp 10.66.66.66 | |
1124 | ... | |
1125 | ftp fec0:6666:6666::193.233.7.65 | |
1126 | ... | |
1127 | ||
1128 | */ | |
1129 | ||
3b04ddde SH |
1130 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1131 | unsigned short type, | |
1507850b | 1132 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 1133 | { |
2941a486 | 1134 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1135 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1136 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1137 | |
1138 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1139 | p[0] = t->parms.o_flags; | |
1140 | p[1] = htons(type); | |
1141 | ||
1142 | /* | |
e905a9ed | 1143 | * Set the source hardware address. |
1da177e4 | 1144 | */ |
e905a9ed | 1145 | |
1da177e4 LT |
1146 | if (saddr) |
1147 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 1148 | if (daddr) |
1da177e4 | 1149 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 1150 | if (iph->daddr) |
1da177e4 | 1151 | return t->hlen; |
e905a9ed | 1152 | |
1da177e4 LT |
1153 | return -t->hlen; |
1154 | } | |
1155 | ||
6a5f44d7 TT |
1156 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1157 | { | |
6ed2533e | 1158 | struct iphdr *iph = (struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1159 | memcpy(haddr, &iph->saddr, 4); |
1160 | return 4; | |
1161 | } | |
1162 | ||
3b04ddde SH |
1163 | static const struct header_ops ipgre_header_ops = { |
1164 | .create = ipgre_header, | |
6a5f44d7 | 1165 | .parse = ipgre_header_parse, |
3b04ddde SH |
1166 | }; |
1167 | ||
6a5f44d7 | 1168 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1169 | static int ipgre_open(struct net_device *dev) |
1170 | { | |
2941a486 | 1171 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1172 | |
f97c1e0c | 1173 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
1da177e4 LT |
1174 | struct flowi fl = { .oif = t->parms.link, |
1175 | .nl_u = { .ip4_u = | |
1176 | { .daddr = t->parms.iph.daddr, | |
1177 | .saddr = t->parms.iph.saddr, | |
1178 | .tos = RT_TOS(t->parms.iph.tos) } }, | |
1179 | .proto = IPPROTO_GRE }; | |
1180 | struct rtable *rt; | |
96635522 | 1181 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
1da177e4 | 1182 | return -EADDRNOTAVAIL; |
d8d1f30b | 1183 | dev = rt->dst.dev; |
1da177e4 | 1184 | ip_rt_put(rt); |
e5ed6399 | 1185 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1186 | return -EADDRNOTAVAIL; |
1187 | t->mlink = dev->ifindex; | |
e5ed6399 | 1188 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1189 | } |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static int ipgre_close(struct net_device *dev) | |
1194 | { | |
2941a486 | 1195 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1196 | |
f97c1e0c | 1197 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1198 | struct in_device *in_dev; |
c346dca1 | 1199 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
1da177e4 LT |
1200 | if (in_dev) { |
1201 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); | |
1202 | in_dev_put(in_dev); | |
1203 | } | |
1204 | } | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | #endif | |
1209 | ||
b8c26a33 SH |
1210 | static const struct net_device_ops ipgre_netdev_ops = { |
1211 | .ndo_init = ipgre_tunnel_init, | |
1212 | .ndo_uninit = ipgre_tunnel_uninit, | |
1213 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1214 | .ndo_open = ipgre_open, | |
1215 | .ndo_stop = ipgre_close, | |
1216 | #endif | |
1217 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1218 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1219 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
1220 | }; | |
1221 | ||
1da177e4 LT |
1222 | static void ipgre_tunnel_setup(struct net_device *dev) |
1223 | { | |
b8c26a33 | 1224 | dev->netdev_ops = &ipgre_netdev_ops; |
1da177e4 | 1225 | dev->destructor = free_netdev; |
1da177e4 LT |
1226 | |
1227 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1228 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1229 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1230 | dev->flags = IFF_NOARP; |
1231 | dev->iflink = 0; | |
1232 | dev->addr_len = 4; | |
0b67eceb | 1233 | dev->features |= NETIF_F_NETNS_LOCAL; |
108bfa89 | 1234 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | static int ipgre_tunnel_init(struct net_device *dev) | |
1238 | { | |
1da177e4 LT |
1239 | struct ip_tunnel *tunnel; |
1240 | struct iphdr *iph; | |
1da177e4 | 1241 | |
2941a486 | 1242 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1243 | iph = &tunnel->parms.iph; |
1244 | ||
1245 | tunnel->dev = dev; | |
1246 | strcpy(tunnel->parms.name, dev->name); | |
1247 | ||
1248 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1249 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1250 | ||
1da177e4 | 1251 | if (iph->daddr) { |
1da177e4 | 1252 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1253 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1254 | if (!iph->saddr) |
1255 | return -EINVAL; | |
1256 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1257 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1258 | } |
1259 | #endif | |
ee34c1eb | 1260 | } else |
6a5f44d7 | 1261 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1262 | |
1da177e4 LT |
1263 | return 0; |
1264 | } | |
1265 | ||
b8c26a33 | 1266 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1267 | { |
2941a486 | 1268 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1269 | struct iphdr *iph = &tunnel->parms.iph; |
eb8ce741 | 1270 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
1da177e4 LT |
1271 | |
1272 | tunnel->dev = dev; | |
1273 | strcpy(tunnel->parms.name, dev->name); | |
1274 | ||
1275 | iph->version = 4; | |
1276 | iph->protocol = IPPROTO_GRE; | |
1277 | iph->ihl = 5; | |
1278 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1279 | ||
1280 | dev_hold(dev); | |
1507850b | 1281 | rcu_assign_pointer(ign->tunnels_wc[0], tunnel); |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | ||
00959ade DK |
1285 | static const struct gre_protocol ipgre_protocol = { |
1286 | .handler = ipgre_rcv, | |
1287 | .err_handler = ipgre_err, | |
1da177e4 LT |
1288 | }; |
1289 | ||
eef6dd65 | 1290 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
eb8ce741 PE |
1291 | { |
1292 | int prio; | |
1293 | ||
1294 | for (prio = 0; prio < 4; prio++) { | |
1295 | int h; | |
1296 | for (h = 0; h < HASH_SIZE; h++) { | |
1507850b ED |
1297 | struct ip_tunnel *t; |
1298 | ||
1299 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
eef6dd65 ED |
1300 | |
1301 | while (t != NULL) { | |
1302 | unregister_netdevice_queue(t->dev, head); | |
1507850b | 1303 | t = rtnl_dereference(t->next); |
eef6dd65 | 1304 | } |
eb8ce741 PE |
1305 | } |
1306 | } | |
1307 | } | |
1308 | ||
2c8c1e72 | 1309 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1310 | { |
cfb8fbf2 | 1311 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
59a4c759 | 1312 | int err; |
59a4c759 | 1313 | |
7daa0004 PE |
1314 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1315 | ipgre_tunnel_setup); | |
1316 | if (!ign->fb_tunnel_dev) { | |
1317 | err = -ENOMEM; | |
1318 | goto err_alloc_dev; | |
1319 | } | |
be77e593 | 1320 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1321 | |
b8c26a33 | 1322 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1323 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1324 | |
1325 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1326 | goto err_reg_dev; | |
1327 | ||
59a4c759 PE |
1328 | return 0; |
1329 | ||
7daa0004 PE |
1330 | err_reg_dev: |
1331 | free_netdev(ign->fb_tunnel_dev); | |
1332 | err_alloc_dev: | |
59a4c759 PE |
1333 | return err; |
1334 | } | |
1335 | ||
2c8c1e72 | 1336 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 PE |
1337 | { |
1338 | struct ipgre_net *ign; | |
eef6dd65 | 1339 | LIST_HEAD(list); |
59a4c759 PE |
1340 | |
1341 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1342 | rtnl_lock(); |
eef6dd65 ED |
1343 | ipgre_destroy_tunnels(ign, &list); |
1344 | unregister_netdevice_many(&list); | |
7daa0004 | 1345 | rtnl_unlock(); |
59a4c759 PE |
1346 | } |
1347 | ||
1348 | static struct pernet_operations ipgre_net_ops = { | |
1349 | .init = ipgre_init_net, | |
1350 | .exit = ipgre_exit_net, | |
cfb8fbf2 EB |
1351 | .id = &ipgre_net_id, |
1352 | .size = sizeof(struct ipgre_net), | |
59a4c759 | 1353 | }; |
1da177e4 | 1354 | |
c19e654d HX |
1355 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1356 | { | |
1357 | __be16 flags; | |
1358 | ||
1359 | if (!data) | |
1360 | return 0; | |
1361 | ||
1362 | flags = 0; | |
1363 | if (data[IFLA_GRE_IFLAGS]) | |
1364 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1365 | if (data[IFLA_GRE_OFLAGS]) | |
1366 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1367 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1368 | return -EINVAL; | |
1369 | ||
1370 | return 0; | |
1371 | } | |
1372 | ||
e1a80002 HX |
1373 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1374 | { | |
1375 | __be32 daddr; | |
1376 | ||
1377 | if (tb[IFLA_ADDRESS]) { | |
1378 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1379 | return -EINVAL; | |
1380 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1381 | return -EADDRNOTAVAIL; | |
1382 | } | |
1383 | ||
1384 | if (!data) | |
1385 | goto out; | |
1386 | ||
1387 | if (data[IFLA_GRE_REMOTE]) { | |
1388 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1389 | if (!daddr) | |
1390 | return -EINVAL; | |
1391 | } | |
1392 | ||
1393 | out: | |
1394 | return ipgre_tunnel_validate(tb, data); | |
1395 | } | |
1396 | ||
c19e654d HX |
1397 | static void ipgre_netlink_parms(struct nlattr *data[], |
1398 | struct ip_tunnel_parm *parms) | |
1399 | { | |
7bb82d92 | 1400 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1401 | |
1402 | parms->iph.protocol = IPPROTO_GRE; | |
1403 | ||
1404 | if (!data) | |
1405 | return; | |
1406 | ||
1407 | if (data[IFLA_GRE_LINK]) | |
1408 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1409 | ||
1410 | if (data[IFLA_GRE_IFLAGS]) | |
1411 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1412 | ||
1413 | if (data[IFLA_GRE_OFLAGS]) | |
1414 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1415 | ||
1416 | if (data[IFLA_GRE_IKEY]) | |
1417 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1418 | ||
1419 | if (data[IFLA_GRE_OKEY]) | |
1420 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1421 | ||
1422 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1423 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1424 | |
1425 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1426 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1427 | |
1428 | if (data[IFLA_GRE_TTL]) | |
1429 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1430 | ||
1431 | if (data[IFLA_GRE_TOS]) | |
1432 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1433 | ||
1434 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1435 | parms->iph.frag_off = htons(IP_DF); | |
1436 | } | |
1437 | ||
e1a80002 HX |
1438 | static int ipgre_tap_init(struct net_device *dev) |
1439 | { | |
1440 | struct ip_tunnel *tunnel; | |
1441 | ||
1442 | tunnel = netdev_priv(dev); | |
1443 | ||
1444 | tunnel->dev = dev; | |
1445 | strcpy(tunnel->parms.name, dev->name); | |
1446 | ||
1447 | ipgre_tunnel_bind_dev(dev); | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
b8c26a33 SH |
1452 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1453 | .ndo_init = ipgre_tap_init, | |
1454 | .ndo_uninit = ipgre_tunnel_uninit, | |
1455 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1456 | .ndo_set_mac_address = eth_mac_addr, | |
1457 | .ndo_validate_addr = eth_validate_addr, | |
1458 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
1459 | }; | |
1460 | ||
e1a80002 HX |
1461 | static void ipgre_tap_setup(struct net_device *dev) |
1462 | { | |
1463 | ||
1464 | ether_setup(dev); | |
1465 | ||
2e9526b3 | 1466 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
e1a80002 | 1467 | dev->destructor = free_netdev; |
e1a80002 HX |
1468 | |
1469 | dev->iflink = 0; | |
1470 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1471 | } | |
1472 | ||
81adee47 | 1473 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
c19e654d HX |
1474 | struct nlattr *data[]) |
1475 | { | |
1476 | struct ip_tunnel *nt; | |
1477 | struct net *net = dev_net(dev); | |
1478 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1479 | int mtu; | |
1480 | int err; | |
1481 | ||
1482 | nt = netdev_priv(dev); | |
1483 | ipgre_netlink_parms(data, &nt->parms); | |
1484 | ||
e1a80002 | 1485 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1486 | return -EEXIST; |
1487 | ||
e1a80002 HX |
1488 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1489 | random_ether_addr(dev->dev_addr); | |
1490 | ||
c19e654d HX |
1491 | mtu = ipgre_tunnel_bind_dev(dev); |
1492 | if (!tb[IFLA_MTU]) | |
1493 | dev->mtu = mtu; | |
1494 | ||
1495 | err = register_netdevice(dev); | |
1496 | if (err) | |
1497 | goto out; | |
1498 | ||
1499 | dev_hold(dev); | |
1500 | ipgre_tunnel_link(ign, nt); | |
1501 | ||
1502 | out: | |
1503 | return err; | |
1504 | } | |
1505 | ||
1506 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1507 | struct nlattr *data[]) | |
1508 | { | |
1509 | struct ip_tunnel *t, *nt; | |
1510 | struct net *net = dev_net(dev); | |
1511 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1512 | struct ip_tunnel_parm p; | |
1513 | int mtu; | |
1514 | ||
1515 | if (dev == ign->fb_tunnel_dev) | |
1516 | return -EINVAL; | |
1517 | ||
1518 | nt = netdev_priv(dev); | |
1519 | ipgre_netlink_parms(data, &p); | |
1520 | ||
1521 | t = ipgre_tunnel_locate(net, &p, 0); | |
1522 | ||
1523 | if (t) { | |
1524 | if (t->dev != dev) | |
1525 | return -EEXIST; | |
1526 | } else { | |
c19e654d HX |
1527 | t = nt; |
1528 | ||
2e9526b3 | 1529 | if (dev->type != ARPHRD_ETHER) { |
1507850b | 1530 | unsigned int nflags = 0; |
c19e654d | 1531 | |
2e9526b3 HX |
1532 | if (ipv4_is_multicast(p.iph.daddr)) |
1533 | nflags = IFF_BROADCAST; | |
1534 | else if (p.iph.daddr) | |
1535 | nflags = IFF_POINTOPOINT; | |
1536 | ||
1537 | if ((dev->flags ^ nflags) & | |
1538 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1539 | return -EINVAL; | |
1540 | } | |
c19e654d HX |
1541 | |
1542 | ipgre_tunnel_unlink(ign, t); | |
1543 | t->parms.iph.saddr = p.iph.saddr; | |
1544 | t->parms.iph.daddr = p.iph.daddr; | |
1545 | t->parms.i_key = p.i_key; | |
2e9526b3 HX |
1546 | if (dev->type != ARPHRD_ETHER) { |
1547 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1548 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1549 | } | |
c19e654d HX |
1550 | ipgre_tunnel_link(ign, t); |
1551 | netdev_state_change(dev); | |
1552 | } | |
1553 | ||
1554 | t->parms.o_key = p.o_key; | |
1555 | t->parms.iph.ttl = p.iph.ttl; | |
1556 | t->parms.iph.tos = p.iph.tos; | |
1557 | t->parms.iph.frag_off = p.iph.frag_off; | |
1558 | ||
1559 | if (t->parms.link != p.link) { | |
1560 | t->parms.link = p.link; | |
1561 | mtu = ipgre_tunnel_bind_dev(dev); | |
1562 | if (!tb[IFLA_MTU]) | |
1563 | dev->mtu = mtu; | |
1564 | netdev_state_change(dev); | |
1565 | } | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
1570 | static size_t ipgre_get_size(const struct net_device *dev) | |
1571 | { | |
1572 | return | |
1573 | /* IFLA_GRE_LINK */ | |
1574 | nla_total_size(4) + | |
1575 | /* IFLA_GRE_IFLAGS */ | |
1576 | nla_total_size(2) + | |
1577 | /* IFLA_GRE_OFLAGS */ | |
1578 | nla_total_size(2) + | |
1579 | /* IFLA_GRE_IKEY */ | |
1580 | nla_total_size(4) + | |
1581 | /* IFLA_GRE_OKEY */ | |
1582 | nla_total_size(4) + | |
1583 | /* IFLA_GRE_LOCAL */ | |
1584 | nla_total_size(4) + | |
1585 | /* IFLA_GRE_REMOTE */ | |
1586 | nla_total_size(4) + | |
1587 | /* IFLA_GRE_TTL */ | |
1588 | nla_total_size(1) + | |
1589 | /* IFLA_GRE_TOS */ | |
1590 | nla_total_size(1) + | |
1591 | /* IFLA_GRE_PMTUDISC */ | |
1592 | nla_total_size(1) + | |
1593 | 0; | |
1594 | } | |
1595 | ||
1596 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1597 | { | |
1598 | struct ip_tunnel *t = netdev_priv(dev); | |
1599 | struct ip_tunnel_parm *p = &t->parms; | |
1600 | ||
1601 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1602 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1603 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
ba9e64b1 PM |
1604 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
1605 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); | |
4d74f8ba PM |
1606 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
1607 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); | |
c19e654d HX |
1608 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
1609 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1610 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1611 | ||
1612 | return 0; | |
1613 | ||
1614 | nla_put_failure: | |
1615 | return -EMSGSIZE; | |
1616 | } | |
1617 | ||
1618 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1619 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1620 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1621 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1622 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1623 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1624 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1625 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1626 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1627 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1628 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1629 | }; | |
1630 | ||
1631 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1632 | .kind = "gre", | |
1633 | .maxtype = IFLA_GRE_MAX, | |
1634 | .policy = ipgre_policy, | |
1635 | .priv_size = sizeof(struct ip_tunnel), | |
1636 | .setup = ipgre_tunnel_setup, | |
1637 | .validate = ipgre_tunnel_validate, | |
1638 | .newlink = ipgre_newlink, | |
1639 | .changelink = ipgre_changelink, | |
1640 | .get_size = ipgre_get_size, | |
1641 | .fill_info = ipgre_fill_info, | |
1642 | }; | |
1643 | ||
e1a80002 HX |
1644 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1645 | .kind = "gretap", | |
1646 | .maxtype = IFLA_GRE_MAX, | |
1647 | .policy = ipgre_policy, | |
1648 | .priv_size = sizeof(struct ip_tunnel), | |
1649 | .setup = ipgre_tap_setup, | |
1650 | .validate = ipgre_tap_validate, | |
1651 | .newlink = ipgre_newlink, | |
1652 | .changelink = ipgre_changelink, | |
1653 | .get_size = ipgre_get_size, | |
1654 | .fill_info = ipgre_fill_info, | |
1655 | }; | |
1656 | ||
1da177e4 LT |
1657 | /* |
1658 | * And now the modules code and kernel interface. | |
1659 | */ | |
1660 | ||
1661 | static int __init ipgre_init(void) | |
1662 | { | |
1663 | int err; | |
1664 | ||
1665 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1666 | ||
cfb8fbf2 | 1667 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1668 | if (err < 0) |
c2892f02 AD |
1669 | return err; |
1670 | ||
00959ade | 1671 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1672 | if (err < 0) { |
1673 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1674 | goto add_proto_failed; | |
1675 | } | |
7daa0004 | 1676 | |
c19e654d HX |
1677 | err = rtnl_link_register(&ipgre_link_ops); |
1678 | if (err < 0) | |
1679 | goto rtnl_link_failed; | |
1680 | ||
e1a80002 HX |
1681 | err = rtnl_link_register(&ipgre_tap_ops); |
1682 | if (err < 0) | |
1683 | goto tap_ops_failed; | |
1684 | ||
c19e654d | 1685 | out: |
1da177e4 | 1686 | return err; |
c19e654d | 1687 | |
e1a80002 HX |
1688 | tap_ops_failed: |
1689 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1690 | rtnl_link_failed: |
00959ade | 1691 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1692 | add_proto_failed: |
1693 | unregister_pernet_device(&ipgre_net_ops); | |
c19e654d | 1694 | goto out; |
1da177e4 LT |
1695 | } |
1696 | ||
db44575f | 1697 | static void __exit ipgre_fini(void) |
1da177e4 | 1698 | { |
e1a80002 | 1699 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1700 | rtnl_link_unregister(&ipgre_link_ops); |
00959ade | 1701 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
1da177e4 | 1702 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); |
c2892f02 | 1703 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1704 | } |
1705 | ||
1706 | module_init(ipgre_init); | |
1707 | module_exit(ipgre_fini); | |
1708 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1709 | MODULE_ALIAS_RTNL_LINK("gre"); |
1710 | MODULE_ALIAS_RTNL_LINK("gretap"); |