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 | |
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), | |
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; | |
174 | }; | |
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 | ||
b37d428b PE |
416 | if (strchr(name, '%')) { |
417 | if (dev_alloc_name(dev, name) < 0) | |
418 | goto failed_free; | |
419 | } | |
420 | ||
2941a486 | 421 | nt = netdev_priv(dev); |
1da177e4 | 422 | nt->parms = *parms; |
c19e654d | 423 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 424 | |
42aa9162 HX |
425 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
426 | ||
b37d428b PE |
427 | if (register_netdevice(dev) < 0) |
428 | goto failed_free; | |
1da177e4 | 429 | |
1da177e4 | 430 | dev_hold(dev); |
f57e7d5a | 431 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
432 | return nt; |
433 | ||
b37d428b PE |
434 | failed_free: |
435 | free_netdev(dev); | |
1da177e4 LT |
436 | return NULL; |
437 | } | |
438 | ||
439 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
440 | { | |
f57e7d5a PE |
441 | struct net *net = dev_net(dev); |
442 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
443 | ||
444 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
445 | dev_put(dev); |
446 | } | |
447 | ||
448 | ||
449 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
450 | { | |
1da177e4 | 451 | |
071f92d0 | 452 | /* All the routers (except for Linux) return only |
1da177e4 LT |
453 | 8 bytes of packet payload. It means, that precise relaying of |
454 | ICMP in the real Internet is absolutely infeasible. | |
455 | ||
456 | Moreover, Cisco "wise men" put GRE key to the third word | |
457 | in GRE header. It makes impossible maintaining even soft state for keyed | |
458 | GRE tunnels with enabled checksum. Tell them "thank you". | |
459 | ||
460 | Well, I wonder, rfc1812 was written by Cisco employee, | |
461 | what the hell these idiots break standrads established | |
462 | by themself??? | |
463 | */ | |
464 | ||
b71d1d42 | 465 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
d5a0a1e3 | 466 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 467 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
468 | const int type = icmp_hdr(skb)->type; |
469 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 470 | struct ip_tunnel *t; |
d5a0a1e3 | 471 | __be16 flags; |
1da177e4 LT |
472 | |
473 | flags = p[0]; | |
474 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
475 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
476 | return; | |
477 | if (flags&GRE_KEY) { | |
478 | grehlen += 4; | |
479 | if (flags&GRE_CSUM) | |
480 | grehlen += 4; | |
481 | } | |
482 | } | |
483 | ||
484 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
485 | if (skb_headlen(skb) < grehlen) | |
486 | return; | |
487 | ||
488 | switch (type) { | |
489 | default: | |
490 | case ICMP_PARAMETERPROB: | |
491 | return; | |
492 | ||
493 | case ICMP_DEST_UNREACH: | |
494 | switch (code) { | |
495 | case ICMP_SR_FAILED: | |
496 | case ICMP_PORT_UNREACH: | |
497 | /* Impossible event. */ | |
498 | return; | |
499 | case ICMP_FRAG_NEEDED: | |
500 | /* Soft state for pmtu is maintained by IP core. */ | |
501 | return; | |
502 | default: | |
503 | /* All others are translated to HOST_UNREACH. | |
504 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
505 | I believe they are just ether pollution. --ANK | |
506 | */ | |
507 | break; | |
508 | } | |
509 | break; | |
510 | case ICMP_TIME_EXCEEDED: | |
511 | if (code != ICMP_EXC_TTL) | |
512 | return; | |
513 | break; | |
514 | } | |
515 | ||
8d5b2c08 | 516 | rcu_read_lock(); |
749c10f9 | 517 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
518 | flags & GRE_KEY ? |
519 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
520 | p[1]); | |
f97c1e0c JP |
521 | if (t == NULL || t->parms.iph.daddr == 0 || |
522 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
523 | goto out; |
524 | ||
525 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
526 | goto out; | |
527 | ||
da6185d8 | 528 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
529 | t->err_count++; |
530 | else | |
531 | t->err_count = 1; | |
532 | t->err_time = jiffies; | |
533 | out: | |
8d5b2c08 | 534 | rcu_read_unlock(); |
1da177e4 LT |
535 | } |
536 | ||
b71d1d42 | 537 | static inline void ipgre_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
538 | { |
539 | if (INET_ECN_is_ce(iph->tos)) { | |
540 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 541 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 542 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 543 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
544 | } |
545 | } | |
546 | } | |
547 | ||
548 | static inline u8 | |
b71d1d42 | 549 | ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb) |
1da177e4 LT |
550 | { |
551 | u8 inner = 0; | |
552 | if (skb->protocol == htons(ETH_P_IP)) | |
553 | inner = old_iph->tos; | |
554 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
b71d1d42 | 555 | inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
556 | return INET_ECN_encapsulate(tos, inner); |
557 | } | |
558 | ||
559 | static int ipgre_rcv(struct sk_buff *skb) | |
560 | { | |
b71d1d42 | 561 | const struct iphdr *iph; |
1da177e4 | 562 | u8 *h; |
d5a0a1e3 | 563 | __be16 flags; |
d3bc23e7 | 564 | __sum16 csum = 0; |
d5a0a1e3 | 565 | __be32 key = 0; |
1da177e4 LT |
566 | u32 seqno = 0; |
567 | struct ip_tunnel *tunnel; | |
568 | int offset = 4; | |
e1a80002 | 569 | __be16 gre_proto; |
1da177e4 LT |
570 | |
571 | if (!pskb_may_pull(skb, 16)) | |
572 | goto drop_nolock; | |
573 | ||
eddc9ec5 | 574 | iph = ip_hdr(skb); |
1da177e4 | 575 | h = skb->data; |
d5a0a1e3 | 576 | flags = *(__be16*)h; |
1da177e4 LT |
577 | |
578 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
579 | /* - Version must be 0. | |
580 | - We do not support routing headers. | |
581 | */ | |
582 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
583 | goto drop_nolock; | |
584 | ||
585 | if (flags&GRE_CSUM) { | |
fb286bb2 | 586 | switch (skb->ip_summed) { |
84fa7933 | 587 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 588 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
589 | if (!csum) |
590 | break; | |
591 | /* fall through */ | |
592 | case CHECKSUM_NONE: | |
593 | skb->csum = 0; | |
594 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 595 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
596 | } |
597 | offset += 4; | |
598 | } | |
599 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 600 | key = *(__be32*)(h + offset); |
1da177e4 LT |
601 | offset += 4; |
602 | } | |
603 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 604 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
605 | offset += 4; |
606 | } | |
607 | } | |
608 | ||
e1a80002 HX |
609 | gre_proto = *(__be16 *)(h + 2); |
610 | ||
8d5b2c08 | 611 | rcu_read_lock(); |
749c10f9 | 612 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
613 | iph->saddr, iph->daddr, key, |
614 | gre_proto))) { | |
e985aad7 | 615 | struct pcpu_tstats *tstats; |
addd68eb | 616 | |
1da177e4 LT |
617 | secpath_reset(skb); |
618 | ||
e1a80002 | 619 | skb->protocol = gre_proto; |
1da177e4 LT |
620 | /* WCCP version 1 and 2 protocol decoding. |
621 | * - Change protocol to IP | |
622 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
623 | */ | |
e1a80002 | 624 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 625 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 626 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
627 | offset += 4; |
628 | } | |
629 | ||
1d069167 | 630 | skb->mac_header = skb->network_header; |
4209fb60 | 631 | __pskb_pull(skb, offset); |
9c70220b | 632 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
633 | skb->pkt_type = PACKET_HOST; |
634 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 635 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 636 | /* Looped back packet, drop it! */ |
c7537967 | 637 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 638 | goto drop; |
e985aad7 | 639 | tunnel->dev->stats.multicast++; |
1da177e4 LT |
640 | skb->pkt_type = PACKET_BROADCAST; |
641 | } | |
642 | #endif | |
643 | ||
644 | if (((flags&GRE_CSUM) && csum) || | |
645 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
e985aad7 ED |
646 | tunnel->dev->stats.rx_crc_errors++; |
647 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
648 | goto drop; |
649 | } | |
650 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
651 | if (!(flags&GRE_SEQ) || | |
652 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
e985aad7 ED |
653 | tunnel->dev->stats.rx_fifo_errors++; |
654 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
655 | goto drop; |
656 | } | |
657 | tunnel->i_seqno = seqno + 1; | |
658 | } | |
e1a80002 HX |
659 | |
660 | /* Warning: All skb pointers will be invalidated! */ | |
661 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
662 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
e985aad7 ED |
663 | tunnel->dev->stats.rx_length_errors++; |
664 | tunnel->dev->stats.rx_errors++; | |
e1a80002 HX |
665 | goto drop; |
666 | } | |
667 | ||
668 | iph = ip_hdr(skb); | |
669 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
670 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
671 | } | |
672 | ||
e985aad7 ED |
673 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
674 | tstats->rx_packets++; | |
675 | tstats->rx_bytes += skb->len; | |
676 | ||
677 | __skb_tunnel_rx(skb, tunnel->dev); | |
e1a80002 HX |
678 | |
679 | skb_reset_network_header(skb); | |
1da177e4 | 680 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 681 | |
caf586e5 | 682 | netif_rx(skb); |
8990f468 | 683 | |
8d5b2c08 | 684 | rcu_read_unlock(); |
8990f468 | 685 | return 0; |
1da177e4 | 686 | } |
45af08be | 687 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
688 | |
689 | drop: | |
8d5b2c08 | 690 | rcu_read_unlock(); |
1da177e4 LT |
691 | drop_nolock: |
692 | kfree_skb(skb); | |
a02cec21 | 693 | return 0; |
1da177e4 LT |
694 | } |
695 | ||
6fef4c0c | 696 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 697 | { |
2941a486 | 698 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e985aad7 | 699 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
700 | const struct iphdr *old_iph = ip_hdr(skb); |
701 | const struct iphdr *tiph; | |
cbb1e85f | 702 | struct flowi4 fl4; |
1da177e4 | 703 | u8 tos; |
d5a0a1e3 | 704 | __be16 df; |
1da177e4 | 705 | struct rtable *rt; /* Route to the other host */ |
1507850b | 706 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 707 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 708 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 709 | int gre_hlen; |
d5a0a1e3 | 710 | __be32 dst; |
1da177e4 LT |
711 | int mtu; |
712 | ||
e1a80002 HX |
713 | if (dev->type == ARPHRD_ETHER) |
714 | IPCB(skb)->flags = 0; | |
715 | ||
716 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 717 | gre_hlen = 0; |
b71d1d42 | 718 | tiph = (const struct iphdr *)skb->data; |
1da177e4 LT |
719 | } else { |
720 | gre_hlen = tunnel->hlen; | |
721 | tiph = &tunnel->parms.iph; | |
722 | } | |
723 | ||
724 | if ((dst = tiph->daddr) == 0) { | |
725 | /* NBMA tunnel */ | |
726 | ||
adf30907 | 727 | if (skb_dst(skb) == NULL) { |
e985aad7 | 728 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
729 | goto tx_error; |
730 | } | |
731 | ||
732 | if (skb->protocol == htons(ETH_P_IP)) { | |
511c3f92 | 733 | rt = skb_rtable(skb); |
1da177e4 LT |
734 | if ((dst = rt->rt_gateway) == 0) |
735 | goto tx_error_icmp; | |
736 | } | |
842c74bf | 737 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 738 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
b71d1d42 | 739 | const struct in6_addr *addr6; |
1da177e4 | 740 | int addr_type; |
adf30907 | 741 | struct neighbour *neigh = skb_dst(skb)->neighbour; |
1da177e4 LT |
742 | |
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) | |
755 | goto tx_error_icmp; | |
756 | ||
757 | dst = addr6->s6_addr32[3]; | |
758 | } | |
759 | #endif | |
760 | else | |
761 | goto tx_error; | |
762 | } | |
763 | ||
764 | tos = tiph->tos; | |
ee686ca9 AJ |
765 | if (tos == 1) { |
766 | tos = 0; | |
1da177e4 LT |
767 | if (skb->protocol == htons(ETH_P_IP)) |
768 | tos = old_iph->tos; | |
dd4ba83d | 769 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 770 | tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
771 | } |
772 | ||
cbb1e85f | 773 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr, |
78fbfd8a DM |
774 | tunnel->parms.o_key, RT_TOS(tos), |
775 | tunnel->parms.link); | |
776 | if (IS_ERR(rt)) { | |
777 | dev->stats.tx_carrier_errors++; | |
778 | goto tx_error; | |
1da177e4 | 779 | } |
d8d1f30b | 780 | tdev = rt->dst.dev; |
1da177e4 LT |
781 | |
782 | if (tdev == dev) { | |
783 | ip_rt_put(rt); | |
e985aad7 | 784 | dev->stats.collisions++; |
1da177e4 LT |
785 | goto tx_error; |
786 | } | |
787 | ||
788 | df = tiph->frag_off; | |
789 | if (df) | |
d8d1f30b | 790 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 | 791 | else |
adf30907 | 792 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 | 793 | |
adf30907 ED |
794 | if (skb_dst(skb)) |
795 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
796 | |
797 | if (skb->protocol == htons(ETH_P_IP)) { | |
798 | df |= (old_iph->frag_off&htons(IP_DF)); | |
799 | ||
800 | if ((old_iph->frag_off&htons(IP_DF)) && | |
801 | mtu < ntohs(old_iph->tot_len)) { | |
802 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
803 | ip_rt_put(rt); | |
804 | goto tx_error; | |
805 | } | |
806 | } | |
842c74bf | 807 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 808 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
adf30907 | 809 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
1da177e4 | 810 | |
adf30907 | 811 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
f97c1e0c JP |
812 | if ((tunnel->parms.iph.daddr && |
813 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
814 | rt6->rt6i_dst.plen == 128) { |
815 | rt6->rt6i_flags |= RTF_MODIFIED; | |
defb3519 | 816 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); |
1da177e4 LT |
817 | } |
818 | } | |
819 | ||
820 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
3ffe533c | 821 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1da177e4 LT |
822 | ip_rt_put(rt); |
823 | goto tx_error; | |
824 | } | |
825 | } | |
826 | #endif | |
827 | ||
828 | if (tunnel->err_count > 0) { | |
da6185d8 WY |
829 | if (time_before(jiffies, |
830 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
831 | tunnel->err_count--; |
832 | ||
833 | dst_link_failure(skb); | |
834 | } else | |
835 | tunnel->err_count = 0; | |
836 | } | |
837 | ||
d8d1f30b | 838 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
1da177e4 | 839 | |
cfbba49d PM |
840 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
841 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 842 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
243aad83 TT |
843 | if (max_headroom > dev->needed_headroom) |
844 | dev->needed_headroom = max_headroom; | |
1da177e4 LT |
845 | if (!new_skb) { |
846 | ip_rt_put(rt); | |
e985aad7 | 847 | dev->stats.tx_dropped++; |
1da177e4 | 848 | dev_kfree_skb(skb); |
6ed10654 | 849 | return NETDEV_TX_OK; |
1da177e4 LT |
850 | } |
851 | if (skb->sk) | |
852 | skb_set_owner_w(new_skb, skb->sk); | |
853 | dev_kfree_skb(skb); | |
854 | skb = new_skb; | |
eddc9ec5 | 855 | old_iph = ip_hdr(skb); |
1da177e4 LT |
856 | } |
857 | ||
64194c31 | 858 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
859 | skb_push(skb, gre_hlen); |
860 | skb_reset_network_header(skb); | |
1da177e4 | 861 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
862 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
863 | IPSKB_REROUTED); | |
adf30907 | 864 | skb_dst_drop(skb); |
d8d1f30b | 865 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
866 | |
867 | /* | |
868 | * Push down and install the IPIP header. | |
869 | */ | |
870 | ||
eddc9ec5 | 871 | iph = ip_hdr(skb); |
1da177e4 LT |
872 | iph->version = 4; |
873 | iph->ihl = sizeof(struct iphdr) >> 2; | |
874 | iph->frag_off = df; | |
875 | iph->protocol = IPPROTO_GRE; | |
876 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
cbb1e85f DM |
877 | iph->daddr = fl4.daddr; |
878 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
879 | |
880 | if ((iph->ttl = tiph->ttl) == 0) { | |
881 | if (skb->protocol == htons(ETH_P_IP)) | |
882 | iph->ttl = old_iph->ttl; | |
842c74bf | 883 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 884 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 885 | iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
886 | #endif |
887 | else | |
323e126f | 888 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
1da177e4 LT |
889 | } |
890 | ||
e1a80002 HX |
891 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
892 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
893 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
894 | |
895 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 896 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
897 | |
898 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
899 | ++tunnel->o_seqno; | |
900 | *ptr = htonl(tunnel->o_seqno); | |
901 | ptr--; | |
902 | } | |
903 | if (tunnel->parms.o_flags&GRE_KEY) { | |
904 | *ptr = tunnel->parms.o_key; | |
905 | ptr--; | |
906 | } | |
907 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
908 | *ptr = 0; | |
5f92a738 | 909 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
910 | } |
911 | } | |
912 | ||
913 | nf_reset(skb); | |
e985aad7 ED |
914 | tstats = this_cpu_ptr(dev->tstats); |
915 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 916 | return NETDEV_TX_OK; |
1da177e4 LT |
917 | |
918 | tx_error_icmp: | |
919 | dst_link_failure(skb); | |
920 | ||
921 | tx_error: | |
e985aad7 | 922 | dev->stats.tx_errors++; |
1da177e4 | 923 | dev_kfree_skb(skb); |
6ed10654 | 924 | return NETDEV_TX_OK; |
1da177e4 LT |
925 | } |
926 | ||
42aa9162 | 927 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
928 | { |
929 | struct net_device *tdev = NULL; | |
930 | struct ip_tunnel *tunnel; | |
b71d1d42 | 931 | const struct iphdr *iph; |
ee34c1eb MS |
932 | int hlen = LL_MAX_HEADER; |
933 | int mtu = ETH_DATA_LEN; | |
934 | int addend = sizeof(struct iphdr) + 4; | |
935 | ||
936 | tunnel = netdev_priv(dev); | |
937 | iph = &tunnel->parms.iph; | |
938 | ||
c95b819a | 939 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
940 | |
941 | if (iph->daddr) { | |
cbb1e85f DM |
942 | struct flowi4 fl4; |
943 | struct rtable *rt; | |
944 | ||
945 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
946 | iph->daddr, iph->saddr, | |
947 | tunnel->parms.o_key, | |
948 | RT_TOS(iph->tos), | |
949 | tunnel->parms.link); | |
b23dd4fe | 950 | if (!IS_ERR(rt)) { |
d8d1f30b | 951 | tdev = rt->dst.dev; |
ee34c1eb MS |
952 | ip_rt_put(rt); |
953 | } | |
e1a80002 HX |
954 | |
955 | if (dev->type != ARPHRD_ETHER) | |
956 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
957 | } |
958 | ||
959 | if (!tdev && tunnel->parms.link) | |
96635522 | 960 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
961 | |
962 | if (tdev) { | |
c95b819a | 963 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
964 | mtu = tdev->mtu; |
965 | } | |
966 | dev->iflink = tunnel->parms.link; | |
967 | ||
968 | /* Precalculate GRE options length */ | |
969 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
970 | if (tunnel->parms.o_flags&GRE_CSUM) | |
971 | addend += 4; | |
972 | if (tunnel->parms.o_flags&GRE_KEY) | |
973 | addend += 4; | |
974 | if (tunnel->parms.o_flags&GRE_SEQ) | |
975 | addend += 4; | |
976 | } | |
c95b819a | 977 | dev->needed_headroom = addend + hlen; |
8cdb0456 | 978 | mtu -= dev->hard_header_len + addend; |
42aa9162 HX |
979 | |
980 | if (mtu < 68) | |
981 | mtu = 68; | |
982 | ||
ee34c1eb MS |
983 | tunnel->hlen = addend; |
984 | ||
42aa9162 | 985 | return mtu; |
ee34c1eb MS |
986 | } |
987 | ||
1da177e4 LT |
988 | static int |
989 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
990 | { | |
991 | int err = 0; | |
992 | struct ip_tunnel_parm p; | |
993 | struct ip_tunnel *t; | |
f57e7d5a PE |
994 | struct net *net = dev_net(dev); |
995 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
996 | |
997 | switch (cmd) { | |
998 | case SIOCGETTUNNEL: | |
999 | t = NULL; | |
7daa0004 | 1000 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1001 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1002 | err = -EFAULT; | |
1003 | break; | |
1004 | } | |
f57e7d5a | 1005 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
1006 | } |
1007 | if (t == NULL) | |
2941a486 | 1008 | t = netdev_priv(dev); |
1da177e4 LT |
1009 | memcpy(&p, &t->parms, sizeof(p)); |
1010 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1011 | err = -EFAULT; | |
1012 | break; | |
1013 | ||
1014 | case SIOCADDTUNNEL: | |
1015 | case SIOCCHGTUNNEL: | |
1016 | err = -EPERM; | |
1017 | if (!capable(CAP_NET_ADMIN)) | |
1018 | goto done; | |
1019 | ||
1020 | err = -EFAULT; | |
1021 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1022 | goto done; | |
1023 | ||
1024 | err = -EINVAL; | |
1025 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
1026 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
1027 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
1028 | goto done; | |
1029 | if (p.iph.ttl) | |
1030 | p.iph.frag_off |= htons(IP_DF); | |
1031 | ||
1032 | if (!(p.i_flags&GRE_KEY)) | |
1033 | p.i_key = 0; | |
1034 | if (!(p.o_flags&GRE_KEY)) | |
1035 | p.o_key = 0; | |
1036 | ||
f57e7d5a | 1037 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1038 | |
7daa0004 | 1039 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1040 | if (t != NULL) { |
1041 | if (t->dev != dev) { | |
1042 | err = -EEXIST; | |
1043 | break; | |
1044 | } | |
1045 | } else { | |
1507850b | 1046 | unsigned int nflags = 0; |
1da177e4 | 1047 | |
2941a486 | 1048 | t = netdev_priv(dev); |
1da177e4 | 1049 | |
f97c1e0c | 1050 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1051 | nflags = IFF_BROADCAST; |
1052 | else if (p.iph.daddr) | |
1053 | nflags = IFF_POINTOPOINT; | |
1054 | ||
1055 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1056 | err = -EINVAL; | |
1057 | break; | |
1058 | } | |
f57e7d5a | 1059 | ipgre_tunnel_unlink(ign, t); |
74b0b85b | 1060 | synchronize_net(); |
1da177e4 LT |
1061 | t->parms.iph.saddr = p.iph.saddr; |
1062 | t->parms.iph.daddr = p.iph.daddr; | |
1063 | t->parms.i_key = p.i_key; | |
1064 | t->parms.o_key = p.o_key; | |
1065 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1066 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1067 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1068 | netdev_state_change(dev); |
1069 | } | |
1070 | } | |
1071 | ||
1072 | if (t) { | |
1073 | err = 0; | |
1074 | if (cmd == SIOCCHGTUNNEL) { | |
1075 | t->parms.iph.ttl = p.iph.ttl; | |
1076 | t->parms.iph.tos = p.iph.tos; | |
1077 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1078 | if (t->parms.link != p.link) { |
1079 | t->parms.link = p.link; | |
42aa9162 | 1080 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1081 | netdev_state_change(dev); |
1082 | } | |
1da177e4 LT |
1083 | } |
1084 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1085 | err = -EFAULT; | |
1086 | } else | |
1087 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1088 | break; | |
1089 | ||
1090 | case SIOCDELTUNNEL: | |
1091 | err = -EPERM; | |
1092 | if (!capable(CAP_NET_ADMIN)) | |
1093 | goto done; | |
1094 | ||
7daa0004 | 1095 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1096 | err = -EFAULT; |
1097 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1098 | goto done; | |
1099 | err = -ENOENT; | |
f57e7d5a | 1100 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1101 | goto done; |
1102 | err = -EPERM; | |
7daa0004 | 1103 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1104 | goto done; |
1105 | dev = t->dev; | |
1106 | } | |
22f8cde5 SH |
1107 | unregister_netdevice(dev); |
1108 | err = 0; | |
1da177e4 LT |
1109 | break; |
1110 | ||
1111 | default: | |
1112 | err = -EINVAL; | |
1113 | } | |
1114 | ||
1115 | done: | |
1116 | return err; | |
1117 | } | |
1118 | ||
1da177e4 LT |
1119 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1120 | { | |
2941a486 | 1121 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1122 | if (new_mtu < 68 || |
1123 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1124 | return -EINVAL; |
1125 | dev->mtu = new_mtu; | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1da177e4 LT |
1129 | /* Nice toy. Unfortunately, useless in real life :-) |
1130 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1131 | over the Internet, provided multicast routing is tuned. | |
1132 | ||
1133 | ||
1134 | I have no idea was this bicycle invented before me, | |
1135 | so that I had to set ARPHRD_IPGRE to a random value. | |
1136 | I have an impression, that Cisco could make something similar, | |
1137 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1138 | |
1da177e4 LT |
1139 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1140 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1141 | ||
1142 | ping -t 255 224.66.66.66 | |
1143 | ||
1144 | If nobody answers, mbone does not work. | |
1145 | ||
1146 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1147 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1148 | ifconfig Universe up | |
1149 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1150 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1151 | ftp 10.66.66.66 | |
1152 | ... | |
1153 | ftp fec0:6666:6666::193.233.7.65 | |
1154 | ... | |
1155 | ||
1156 | */ | |
1157 | ||
3b04ddde SH |
1158 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1159 | unsigned short type, | |
1507850b | 1160 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 1161 | { |
2941a486 | 1162 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1163 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1164 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1165 | |
1166 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1167 | p[0] = t->parms.o_flags; | |
1168 | p[1] = htons(type); | |
1169 | ||
1170 | /* | |
e905a9ed | 1171 | * Set the source hardware address. |
1da177e4 | 1172 | */ |
e905a9ed | 1173 | |
1da177e4 LT |
1174 | if (saddr) |
1175 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 1176 | if (daddr) |
1da177e4 | 1177 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 1178 | if (iph->daddr) |
1da177e4 | 1179 | return t->hlen; |
e905a9ed | 1180 | |
1da177e4 LT |
1181 | return -t->hlen; |
1182 | } | |
1183 | ||
6a5f44d7 TT |
1184 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1185 | { | |
b71d1d42 | 1186 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1187 | memcpy(haddr, &iph->saddr, 4); |
1188 | return 4; | |
1189 | } | |
1190 | ||
3b04ddde SH |
1191 | static const struct header_ops ipgre_header_ops = { |
1192 | .create = ipgre_header, | |
6a5f44d7 | 1193 | .parse = ipgre_header_parse, |
3b04ddde SH |
1194 | }; |
1195 | ||
6a5f44d7 | 1196 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1197 | static int ipgre_open(struct net_device *dev) |
1198 | { | |
2941a486 | 1199 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1200 | |
f97c1e0c | 1201 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
1202 | struct flowi4 fl4; |
1203 | struct rtable *rt; | |
1204 | ||
1205 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
1206 | t->parms.iph.daddr, | |
1207 | t->parms.iph.saddr, | |
1208 | t->parms.o_key, | |
1209 | RT_TOS(t->parms.iph.tos), | |
1210 | t->parms.link); | |
b23dd4fe | 1211 | if (IS_ERR(rt)) |
1da177e4 | 1212 | return -EADDRNOTAVAIL; |
d8d1f30b | 1213 | dev = rt->dst.dev; |
1da177e4 | 1214 | ip_rt_put(rt); |
e5ed6399 | 1215 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1216 | return -EADDRNOTAVAIL; |
1217 | t->mlink = dev->ifindex; | |
e5ed6399 | 1218 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1219 | } |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static int ipgre_close(struct net_device *dev) | |
1224 | { | |
2941a486 | 1225 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1226 | |
f97c1e0c | 1227 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1228 | struct in_device *in_dev; |
c346dca1 | 1229 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
8723e1b4 | 1230 | if (in_dev) |
1da177e4 | 1231 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
1232 | } |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | #endif | |
1237 | ||
b8c26a33 SH |
1238 | static const struct net_device_ops ipgre_netdev_ops = { |
1239 | .ndo_init = ipgre_tunnel_init, | |
1240 | .ndo_uninit = ipgre_tunnel_uninit, | |
1241 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1242 | .ndo_open = ipgre_open, | |
1243 | .ndo_stop = ipgre_close, | |
1244 | #endif | |
1245 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1246 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1247 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
e985aad7 | 1248 | .ndo_get_stats = ipgre_get_stats, |
b8c26a33 SH |
1249 | }; |
1250 | ||
e985aad7 ED |
1251 | static void ipgre_dev_free(struct net_device *dev) |
1252 | { | |
1253 | free_percpu(dev->tstats); | |
1254 | free_netdev(dev); | |
1255 | } | |
1256 | ||
1da177e4 LT |
1257 | static void ipgre_tunnel_setup(struct net_device *dev) |
1258 | { | |
b8c26a33 | 1259 | dev->netdev_ops = &ipgre_netdev_ops; |
e985aad7 | 1260 | dev->destructor = ipgre_dev_free; |
1da177e4 LT |
1261 | |
1262 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1263 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1264 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1265 | dev->flags = IFF_NOARP; |
1266 | dev->iflink = 0; | |
1267 | dev->addr_len = 4; | |
0b67eceb | 1268 | dev->features |= NETIF_F_NETNS_LOCAL; |
108bfa89 | 1269 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | static int ipgre_tunnel_init(struct net_device *dev) | |
1273 | { | |
1da177e4 LT |
1274 | struct ip_tunnel *tunnel; |
1275 | struct iphdr *iph; | |
1da177e4 | 1276 | |
2941a486 | 1277 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1278 | iph = &tunnel->parms.iph; |
1279 | ||
1280 | tunnel->dev = dev; | |
1281 | strcpy(tunnel->parms.name, dev->name); | |
1282 | ||
1283 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1284 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1285 | ||
1da177e4 | 1286 | if (iph->daddr) { |
1da177e4 | 1287 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1288 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1289 | if (!iph->saddr) |
1290 | return -EINVAL; | |
1291 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1292 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1293 | } |
1294 | #endif | |
ee34c1eb | 1295 | } else |
6a5f44d7 | 1296 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1297 | |
e985aad7 ED |
1298 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1299 | if (!dev->tstats) | |
1300 | return -ENOMEM; | |
1301 | ||
1da177e4 LT |
1302 | return 0; |
1303 | } | |
1304 | ||
b8c26a33 | 1305 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1306 | { |
2941a486 | 1307 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1308 | struct iphdr *iph = &tunnel->parms.iph; |
1309 | ||
1310 | tunnel->dev = dev; | |
1311 | strcpy(tunnel->parms.name, dev->name); | |
1312 | ||
1313 | iph->version = 4; | |
1314 | iph->protocol = IPPROTO_GRE; | |
1315 | iph->ihl = 5; | |
1316 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1317 | ||
1318 | dev_hold(dev); | |
1da177e4 LT |
1319 | } |
1320 | ||
1321 | ||
00959ade DK |
1322 | static const struct gre_protocol ipgre_protocol = { |
1323 | .handler = ipgre_rcv, | |
1324 | .err_handler = ipgre_err, | |
1da177e4 LT |
1325 | }; |
1326 | ||
eef6dd65 | 1327 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
eb8ce741 PE |
1328 | { |
1329 | int prio; | |
1330 | ||
1331 | for (prio = 0; prio < 4; prio++) { | |
1332 | int h; | |
1333 | for (h = 0; h < HASH_SIZE; h++) { | |
1507850b ED |
1334 | struct ip_tunnel *t; |
1335 | ||
1336 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
eef6dd65 ED |
1337 | |
1338 | while (t != NULL) { | |
1339 | unregister_netdevice_queue(t->dev, head); | |
1507850b | 1340 | t = rtnl_dereference(t->next); |
eef6dd65 | 1341 | } |
eb8ce741 PE |
1342 | } |
1343 | } | |
1344 | } | |
1345 | ||
2c8c1e72 | 1346 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1347 | { |
cfb8fbf2 | 1348 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
59a4c759 | 1349 | int err; |
59a4c759 | 1350 | |
7daa0004 PE |
1351 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1352 | ipgre_tunnel_setup); | |
1353 | if (!ign->fb_tunnel_dev) { | |
1354 | err = -ENOMEM; | |
1355 | goto err_alloc_dev; | |
1356 | } | |
be77e593 | 1357 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1358 | |
b8c26a33 | 1359 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1360 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1361 | |
1362 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1363 | goto err_reg_dev; | |
1364 | ||
3285ee3b ED |
1365 | rcu_assign_pointer(ign->tunnels_wc[0], |
1366 | netdev_priv(ign->fb_tunnel_dev)); | |
59a4c759 PE |
1367 | return 0; |
1368 | ||
7daa0004 | 1369 | err_reg_dev: |
3285ee3b | 1370 | ipgre_dev_free(ign->fb_tunnel_dev); |
7daa0004 | 1371 | err_alloc_dev: |
59a4c759 PE |
1372 | return err; |
1373 | } | |
1374 | ||
2c8c1e72 | 1375 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 PE |
1376 | { |
1377 | struct ipgre_net *ign; | |
eef6dd65 | 1378 | LIST_HEAD(list); |
59a4c759 PE |
1379 | |
1380 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1381 | rtnl_lock(); |
eef6dd65 ED |
1382 | ipgre_destroy_tunnels(ign, &list); |
1383 | unregister_netdevice_many(&list); | |
7daa0004 | 1384 | rtnl_unlock(); |
59a4c759 PE |
1385 | } |
1386 | ||
1387 | static struct pernet_operations ipgre_net_ops = { | |
1388 | .init = ipgre_init_net, | |
1389 | .exit = ipgre_exit_net, | |
cfb8fbf2 EB |
1390 | .id = &ipgre_net_id, |
1391 | .size = sizeof(struct ipgre_net), | |
59a4c759 | 1392 | }; |
1da177e4 | 1393 | |
c19e654d HX |
1394 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1395 | { | |
1396 | __be16 flags; | |
1397 | ||
1398 | if (!data) | |
1399 | return 0; | |
1400 | ||
1401 | flags = 0; | |
1402 | if (data[IFLA_GRE_IFLAGS]) | |
1403 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1404 | if (data[IFLA_GRE_OFLAGS]) | |
1405 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1406 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1407 | return -EINVAL; | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
e1a80002 HX |
1412 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1413 | { | |
1414 | __be32 daddr; | |
1415 | ||
1416 | if (tb[IFLA_ADDRESS]) { | |
1417 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1418 | return -EINVAL; | |
1419 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1420 | return -EADDRNOTAVAIL; | |
1421 | } | |
1422 | ||
1423 | if (!data) | |
1424 | goto out; | |
1425 | ||
1426 | if (data[IFLA_GRE_REMOTE]) { | |
1427 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1428 | if (!daddr) | |
1429 | return -EINVAL; | |
1430 | } | |
1431 | ||
1432 | out: | |
1433 | return ipgre_tunnel_validate(tb, data); | |
1434 | } | |
1435 | ||
c19e654d HX |
1436 | static void ipgre_netlink_parms(struct nlattr *data[], |
1437 | struct ip_tunnel_parm *parms) | |
1438 | { | |
7bb82d92 | 1439 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1440 | |
1441 | parms->iph.protocol = IPPROTO_GRE; | |
1442 | ||
1443 | if (!data) | |
1444 | return; | |
1445 | ||
1446 | if (data[IFLA_GRE_LINK]) | |
1447 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1448 | ||
1449 | if (data[IFLA_GRE_IFLAGS]) | |
1450 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1451 | ||
1452 | if (data[IFLA_GRE_OFLAGS]) | |
1453 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1454 | ||
1455 | if (data[IFLA_GRE_IKEY]) | |
1456 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1457 | ||
1458 | if (data[IFLA_GRE_OKEY]) | |
1459 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1460 | ||
1461 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1462 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1463 | |
1464 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1465 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1466 | |
1467 | if (data[IFLA_GRE_TTL]) | |
1468 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1469 | ||
1470 | if (data[IFLA_GRE_TOS]) | |
1471 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1472 | ||
1473 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1474 | parms->iph.frag_off = htons(IP_DF); | |
1475 | } | |
1476 | ||
e1a80002 HX |
1477 | static int ipgre_tap_init(struct net_device *dev) |
1478 | { | |
1479 | struct ip_tunnel *tunnel; | |
1480 | ||
1481 | tunnel = netdev_priv(dev); | |
1482 | ||
1483 | tunnel->dev = dev; | |
1484 | strcpy(tunnel->parms.name, dev->name); | |
1485 | ||
1486 | ipgre_tunnel_bind_dev(dev); | |
1487 | ||
e985aad7 ED |
1488 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1489 | if (!dev->tstats) | |
1490 | return -ENOMEM; | |
1491 | ||
e1a80002 HX |
1492 | return 0; |
1493 | } | |
1494 | ||
b8c26a33 SH |
1495 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1496 | .ndo_init = ipgre_tap_init, | |
1497 | .ndo_uninit = ipgre_tunnel_uninit, | |
1498 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1499 | .ndo_set_mac_address = eth_mac_addr, | |
1500 | .ndo_validate_addr = eth_validate_addr, | |
1501 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
e985aad7 | 1502 | .ndo_get_stats = ipgre_get_stats, |
b8c26a33 SH |
1503 | }; |
1504 | ||
e1a80002 HX |
1505 | static void ipgre_tap_setup(struct net_device *dev) |
1506 | { | |
1507 | ||
1508 | ether_setup(dev); | |
1509 | ||
2e9526b3 | 1510 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
e985aad7 | 1511 | dev->destructor = ipgre_dev_free; |
e1a80002 HX |
1512 | |
1513 | dev->iflink = 0; | |
1514 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1515 | } | |
1516 | ||
81adee47 | 1517 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
c19e654d HX |
1518 | struct nlattr *data[]) |
1519 | { | |
1520 | struct ip_tunnel *nt; | |
1521 | struct net *net = dev_net(dev); | |
1522 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1523 | int mtu; | |
1524 | int err; | |
1525 | ||
1526 | nt = netdev_priv(dev); | |
1527 | ipgre_netlink_parms(data, &nt->parms); | |
1528 | ||
e1a80002 | 1529 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1530 | return -EEXIST; |
1531 | ||
e1a80002 HX |
1532 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1533 | random_ether_addr(dev->dev_addr); | |
1534 | ||
c19e654d HX |
1535 | mtu = ipgre_tunnel_bind_dev(dev); |
1536 | if (!tb[IFLA_MTU]) | |
1537 | dev->mtu = mtu; | |
1538 | ||
b790e01a ED |
1539 | /* Can use a lockless transmit, unless we generate output sequences */ |
1540 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1541 | dev->features |= NETIF_F_LLTX; | |
1542 | ||
c19e654d HX |
1543 | err = register_netdevice(dev); |
1544 | if (err) | |
1545 | goto out; | |
1546 | ||
1547 | dev_hold(dev); | |
1548 | ipgre_tunnel_link(ign, nt); | |
1549 | ||
1550 | out: | |
1551 | return err; | |
1552 | } | |
1553 | ||
1554 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1555 | struct nlattr *data[]) | |
1556 | { | |
1557 | struct ip_tunnel *t, *nt; | |
1558 | struct net *net = dev_net(dev); | |
1559 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1560 | struct ip_tunnel_parm p; | |
1561 | int mtu; | |
1562 | ||
1563 | if (dev == ign->fb_tunnel_dev) | |
1564 | return -EINVAL; | |
1565 | ||
1566 | nt = netdev_priv(dev); | |
1567 | ipgre_netlink_parms(data, &p); | |
1568 | ||
1569 | t = ipgre_tunnel_locate(net, &p, 0); | |
1570 | ||
1571 | if (t) { | |
1572 | if (t->dev != dev) | |
1573 | return -EEXIST; | |
1574 | } else { | |
c19e654d HX |
1575 | t = nt; |
1576 | ||
2e9526b3 | 1577 | if (dev->type != ARPHRD_ETHER) { |
1507850b | 1578 | unsigned int nflags = 0; |
c19e654d | 1579 | |
2e9526b3 HX |
1580 | if (ipv4_is_multicast(p.iph.daddr)) |
1581 | nflags = IFF_BROADCAST; | |
1582 | else if (p.iph.daddr) | |
1583 | nflags = IFF_POINTOPOINT; | |
1584 | ||
1585 | if ((dev->flags ^ nflags) & | |
1586 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1587 | return -EINVAL; | |
1588 | } | |
c19e654d HX |
1589 | |
1590 | ipgre_tunnel_unlink(ign, t); | |
1591 | t->parms.iph.saddr = p.iph.saddr; | |
1592 | t->parms.iph.daddr = p.iph.daddr; | |
1593 | t->parms.i_key = p.i_key; | |
2e9526b3 HX |
1594 | if (dev->type != ARPHRD_ETHER) { |
1595 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1596 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1597 | } | |
c19e654d HX |
1598 | ipgre_tunnel_link(ign, t); |
1599 | netdev_state_change(dev); | |
1600 | } | |
1601 | ||
1602 | t->parms.o_key = p.o_key; | |
1603 | t->parms.iph.ttl = p.iph.ttl; | |
1604 | t->parms.iph.tos = p.iph.tos; | |
1605 | t->parms.iph.frag_off = p.iph.frag_off; | |
1606 | ||
1607 | if (t->parms.link != p.link) { | |
1608 | t->parms.link = p.link; | |
1609 | mtu = ipgre_tunnel_bind_dev(dev); | |
1610 | if (!tb[IFLA_MTU]) | |
1611 | dev->mtu = mtu; | |
1612 | netdev_state_change(dev); | |
1613 | } | |
1614 | ||
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | static size_t ipgre_get_size(const struct net_device *dev) | |
1619 | { | |
1620 | return | |
1621 | /* IFLA_GRE_LINK */ | |
1622 | nla_total_size(4) + | |
1623 | /* IFLA_GRE_IFLAGS */ | |
1624 | nla_total_size(2) + | |
1625 | /* IFLA_GRE_OFLAGS */ | |
1626 | nla_total_size(2) + | |
1627 | /* IFLA_GRE_IKEY */ | |
1628 | nla_total_size(4) + | |
1629 | /* IFLA_GRE_OKEY */ | |
1630 | nla_total_size(4) + | |
1631 | /* IFLA_GRE_LOCAL */ | |
1632 | nla_total_size(4) + | |
1633 | /* IFLA_GRE_REMOTE */ | |
1634 | nla_total_size(4) + | |
1635 | /* IFLA_GRE_TTL */ | |
1636 | nla_total_size(1) + | |
1637 | /* IFLA_GRE_TOS */ | |
1638 | nla_total_size(1) + | |
1639 | /* IFLA_GRE_PMTUDISC */ | |
1640 | nla_total_size(1) + | |
1641 | 0; | |
1642 | } | |
1643 | ||
1644 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1645 | { | |
1646 | struct ip_tunnel *t = netdev_priv(dev); | |
1647 | struct ip_tunnel_parm *p = &t->parms; | |
1648 | ||
1649 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1650 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1651 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
ba9e64b1 PM |
1652 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
1653 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); | |
4d74f8ba PM |
1654 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
1655 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); | |
c19e654d HX |
1656 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
1657 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1658 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1659 | ||
1660 | return 0; | |
1661 | ||
1662 | nla_put_failure: | |
1663 | return -EMSGSIZE; | |
1664 | } | |
1665 | ||
1666 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1667 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1668 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1669 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1670 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1671 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1672 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1673 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1674 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1675 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1676 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1677 | }; | |
1678 | ||
1679 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1680 | .kind = "gre", | |
1681 | .maxtype = IFLA_GRE_MAX, | |
1682 | .policy = ipgre_policy, | |
1683 | .priv_size = sizeof(struct ip_tunnel), | |
1684 | .setup = ipgre_tunnel_setup, | |
1685 | .validate = ipgre_tunnel_validate, | |
1686 | .newlink = ipgre_newlink, | |
1687 | .changelink = ipgre_changelink, | |
1688 | .get_size = ipgre_get_size, | |
1689 | .fill_info = ipgre_fill_info, | |
1690 | }; | |
1691 | ||
e1a80002 HX |
1692 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1693 | .kind = "gretap", | |
1694 | .maxtype = IFLA_GRE_MAX, | |
1695 | .policy = ipgre_policy, | |
1696 | .priv_size = sizeof(struct ip_tunnel), | |
1697 | .setup = ipgre_tap_setup, | |
1698 | .validate = ipgre_tap_validate, | |
1699 | .newlink = ipgre_newlink, | |
1700 | .changelink = ipgre_changelink, | |
1701 | .get_size = ipgre_get_size, | |
1702 | .fill_info = ipgre_fill_info, | |
1703 | }; | |
1704 | ||
1da177e4 LT |
1705 | /* |
1706 | * And now the modules code and kernel interface. | |
1707 | */ | |
1708 | ||
1709 | static int __init ipgre_init(void) | |
1710 | { | |
1711 | int err; | |
1712 | ||
1713 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1714 | ||
cfb8fbf2 | 1715 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1716 | if (err < 0) |
c2892f02 AD |
1717 | return err; |
1718 | ||
00959ade | 1719 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1720 | if (err < 0) { |
1721 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1722 | goto add_proto_failed; | |
1723 | } | |
7daa0004 | 1724 | |
c19e654d HX |
1725 | err = rtnl_link_register(&ipgre_link_ops); |
1726 | if (err < 0) | |
1727 | goto rtnl_link_failed; | |
1728 | ||
e1a80002 HX |
1729 | err = rtnl_link_register(&ipgre_tap_ops); |
1730 | if (err < 0) | |
1731 | goto tap_ops_failed; | |
1732 | ||
c19e654d | 1733 | out: |
1da177e4 | 1734 | return err; |
c19e654d | 1735 | |
e1a80002 HX |
1736 | tap_ops_failed: |
1737 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1738 | rtnl_link_failed: |
00959ade | 1739 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1740 | add_proto_failed: |
1741 | unregister_pernet_device(&ipgre_net_ops); | |
c19e654d | 1742 | goto out; |
1da177e4 LT |
1743 | } |
1744 | ||
db44575f | 1745 | static void __exit ipgre_fini(void) |
1da177e4 | 1746 | { |
e1a80002 | 1747 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1748 | rtnl_link_unregister(&ipgre_link_ops); |
00959ade | 1749 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
1da177e4 | 1750 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); |
c2892f02 | 1751 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1752 | } |
1753 | ||
1754 | module_init(ipgre_init); | |
1755 | module_exit(ipgre_fini); | |
1756 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1757 | MODULE_ALIAS_RTNL_LINK("gre"); |
1758 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1759 | MODULE_ALIAS_NETDEV("gre0"); |