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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 LT |
16 | #include <linux/kernel.h> |
17 | #include <asm/uaccess.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/in.h> | |
21 | #include <linux/tcp.h> | |
22 | #include <linux/udp.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/mroute.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/in6.h> | |
27 | #include <linux/inetdevice.h> | |
28 | #include <linux/igmp.h> | |
29 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 30 | #include <linux/etherdevice.h> |
46f25dff | 31 | #include <linux/if_ether.h> |
1da177e4 LT |
32 | |
33 | #include <net/sock.h> | |
34 | #include <net/ip.h> | |
35 | #include <net/icmp.h> | |
36 | #include <net/protocol.h> | |
37 | #include <net/ipip.h> | |
38 | #include <net/arp.h> | |
39 | #include <net/checksum.h> | |
40 | #include <net/dsfield.h> | |
41 | #include <net/inet_ecn.h> | |
42 | #include <net/xfrm.h> | |
59a4c759 PE |
43 | #include <net/net_namespace.h> |
44 | #include <net/netns/generic.h> | |
c19e654d | 45 | #include <net/rtnetlink.h> |
1da177e4 LT |
46 | |
47 | #ifdef CONFIG_IPV6 | |
48 | #include <net/ipv6.h> | |
49 | #include <net/ip6_fib.h> | |
50 | #include <net/ip6_route.h> | |
51 | #endif | |
52 | ||
53 | /* | |
54 | Problems & solutions | |
55 | -------------------- | |
56 | ||
57 | 1. The most important issue is detecting local dead loops. | |
58 | They would cause complete host lockup in transmit, which | |
59 | would be "resolved" by stack overflow or, if queueing is enabled, | |
60 | with infinite looping in net_bh. | |
61 | ||
62 | We cannot track such dead loops during route installation, | |
63 | it is infeasible task. The most general solutions would be | |
64 | to keep skb->encapsulation counter (sort of local ttl), | |
65 | and silently drop packet when it expires. It is the best | |
66 | solution, but it supposes maintaing new variable in ALL | |
67 | skb, even if no tunneling is used. | |
68 | ||
a43912ab | 69 | Current solution: HARD_TX_LOCK lock breaks dead loops. |
1da177e4 LT |
70 | |
71 | ||
72 | ||
73 | 2. Networking dead loops would not kill routers, but would really | |
74 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
75 | if we copy it from packet being encapsulated to upper header. | |
76 | It is very good solution, but it introduces two problems: | |
77 | ||
78 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
79 | do not work over tunnels. | |
80 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
81 | so that this problem would be solved and traceroute output | |
82 | would even more informative. This idea appeared to be wrong: | |
83 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
84 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
85 | return only 8 bytes of payload. It is the end. | |
86 | ||
87 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
88 | we should search for another solution. | |
89 | ||
90 | One of them is to parse packet trying to detect inner encapsulation | |
91 | made by our node. It is difficult or even impossible, especially, | |
92 | taking into account fragmentation. TO be short, tt is not solution at all. | |
93 | ||
94 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
95 | We force DF flag on tunnels with preconfigured hop limit, | |
96 | that is ALL. :-) Well, it does not remove the problem completely, | |
97 | but exponential growth of network traffic is changed to linear | |
98 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
99 | fastly degrades to value <68, where looping stops. | |
100 | Yes, it is not good if there exists a router in the loop, | |
101 | which does not force DF, even when encapsulating packets have DF set. | |
102 | But it is not our problem! Nobody could accuse us, we made | |
103 | all that we could make. Even if it is your gated who injected | |
104 | fatal route to network, even if it were you who configured | |
105 | fatal static route: you are innocent. :-) | |
106 | ||
107 | ||
108 | ||
109 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain | |
110 | practically identical code. It would be good to glue them | |
111 | together, but it is not very evident, how to make them modular. | |
112 | sit is integral part of IPv6, ipip and gre are naturally modular. | |
113 | We could extract common parts (hash table, ioctl etc) | |
114 | to a separate module (ip_tunnel.c). | |
115 | ||
116 | Alexey Kuznetsov. | |
117 | */ | |
118 | ||
c19e654d | 119 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 LT |
120 | static int ipgre_tunnel_init(struct net_device *dev); |
121 | static void ipgre_tunnel_setup(struct net_device *dev); | |
42aa9162 | 122 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
1da177e4 LT |
123 | |
124 | /* Fallback tunnel: no source, no destination, no key, no options */ | |
125 | ||
eb8ce741 PE |
126 | #define HASH_SIZE 16 |
127 | ||
f99189b1 | 128 | static int ipgre_net_id __read_mostly; |
59a4c759 | 129 | struct ipgre_net { |
eb8ce741 PE |
130 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
131 | ||
7daa0004 | 132 | struct net_device *fb_tunnel_dev; |
59a4c759 PE |
133 | }; |
134 | ||
1da177e4 LT |
135 | /* Tunnel hash table */ |
136 | ||
137 | /* | |
138 | 4 hash tables: | |
139 | ||
140 | 3: (remote,local) | |
141 | 2: (remote,*) | |
142 | 1: (*,local) | |
143 | 0: (*,*) | |
144 | ||
145 | We require exact key match i.e. if a key is present in packet | |
146 | it will match only tunnel with the same key; if it is not present, | |
147 | it will match only keyless tunnel. | |
148 | ||
149 | All keysless packets, if not matched configured keyless tunnels | |
150 | will match fallback tunnel. | |
151 | */ | |
152 | ||
d5a0a1e3 | 153 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 154 | |
eb8ce741 PE |
155 | #define tunnels_r_l tunnels[3] |
156 | #define tunnels_r tunnels[2] | |
157 | #define tunnels_l tunnels[1] | |
158 | #define tunnels_wc tunnels[0] | |
8d5b2c08 ED |
159 | /* |
160 | * Locking : hash tables are protected by RCU and a spinlock | |
161 | */ | |
162 | static DEFINE_SPINLOCK(ipgre_lock); | |
1da177e4 | 163 | |
8d5b2c08 ED |
164 | #define for_each_ip_tunnel_rcu(start) \ |
165 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 LT |
166 | |
167 | /* Given src, dst and key, find appropriate for input tunnel. */ | |
168 | ||
749c10f9 | 169 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev, |
e1a80002 HX |
170 | __be32 remote, __be32 local, |
171 | __be32 key, __be16 gre_proto) | |
1da177e4 | 172 | { |
749c10f9 TT |
173 | struct net *net = dev_net(dev); |
174 | int link = dev->ifindex; | |
1da177e4 LT |
175 | unsigned h0 = HASH(remote); |
176 | unsigned h1 = HASH(key); | |
afcf1242 | 177 | struct ip_tunnel *t, *cand = NULL; |
7daa0004 | 178 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
179 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
180 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
afcf1242 | 181 | int score, cand_score = 4; |
1da177e4 | 182 | |
8d5b2c08 | 183 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
749c10f9 TT |
184 | if (local != t->parms.iph.saddr || |
185 | remote != t->parms.iph.daddr || | |
186 | key != t->parms.i_key || | |
187 | !(t->dev->flags & IFF_UP)) | |
188 | continue; | |
189 | ||
190 | if (t->dev->type != ARPHRD_IPGRE && | |
191 | t->dev->type != dev_type) | |
192 | continue; | |
193 | ||
afcf1242 | 194 | score = 0; |
749c10f9 | 195 | if (t->parms.link != link) |
afcf1242 | 196 | score |= 1; |
749c10f9 | 197 | if (t->dev->type != dev_type) |
afcf1242 TT |
198 | score |= 2; |
199 | if (score == 0) | |
749c10f9 | 200 | return t; |
afcf1242 TT |
201 | |
202 | if (score < cand_score) { | |
203 | cand = t; | |
204 | cand_score = score; | |
205 | } | |
1da177e4 | 206 | } |
e1a80002 | 207 | |
8d5b2c08 | 208 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
749c10f9 TT |
209 | if (remote != t->parms.iph.daddr || |
210 | key != t->parms.i_key || | |
211 | !(t->dev->flags & IFF_UP)) | |
212 | continue; | |
213 | ||
214 | if (t->dev->type != ARPHRD_IPGRE && | |
215 | t->dev->type != dev_type) | |
216 | continue; | |
217 | ||
afcf1242 | 218 | score = 0; |
749c10f9 | 219 | if (t->parms.link != link) |
afcf1242 | 220 | score |= 1; |
749c10f9 | 221 | if (t->dev->type != dev_type) |
afcf1242 TT |
222 | score |= 2; |
223 | if (score == 0) | |
749c10f9 | 224 | return t; |
afcf1242 TT |
225 | |
226 | if (score < cand_score) { | |
227 | cand = t; | |
228 | cand_score = score; | |
229 | } | |
1da177e4 | 230 | } |
e1a80002 | 231 | |
8d5b2c08 | 232 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
749c10f9 TT |
233 | if ((local != t->parms.iph.saddr && |
234 | (local != t->parms.iph.daddr || | |
235 | !ipv4_is_multicast(local))) || | |
236 | key != t->parms.i_key || | |
237 | !(t->dev->flags & IFF_UP)) | |
238 | continue; | |
239 | ||
240 | if (t->dev->type != ARPHRD_IPGRE && | |
241 | t->dev->type != dev_type) | |
242 | continue; | |
243 | ||
afcf1242 | 244 | score = 0; |
749c10f9 | 245 | if (t->parms.link != link) |
afcf1242 | 246 | score |= 1; |
749c10f9 | 247 | if (t->dev->type != dev_type) |
afcf1242 TT |
248 | score |= 2; |
249 | if (score == 0) | |
749c10f9 | 250 | return t; |
afcf1242 TT |
251 | |
252 | if (score < cand_score) { | |
253 | cand = t; | |
254 | cand_score = score; | |
255 | } | |
1da177e4 | 256 | } |
e1a80002 | 257 | |
8d5b2c08 | 258 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
749c10f9 TT |
259 | if (t->parms.i_key != key || |
260 | !(t->dev->flags & IFF_UP)) | |
261 | continue; | |
262 | ||
263 | if (t->dev->type != ARPHRD_IPGRE && | |
264 | t->dev->type != dev_type) | |
265 | continue; | |
266 | ||
afcf1242 | 267 | score = 0; |
749c10f9 | 268 | if (t->parms.link != link) |
afcf1242 | 269 | score |= 1; |
749c10f9 | 270 | if (t->dev->type != dev_type) |
afcf1242 TT |
271 | score |= 2; |
272 | if (score == 0) | |
749c10f9 | 273 | return t; |
afcf1242 TT |
274 | |
275 | if (score < cand_score) { | |
276 | cand = t; | |
277 | cand_score = score; | |
278 | } | |
1da177e4 LT |
279 | } |
280 | ||
afcf1242 TT |
281 | if (cand != NULL) |
282 | return cand; | |
e1a80002 | 283 | |
8d5b2c08 ED |
284 | dev = ign->fb_tunnel_dev; |
285 | if (dev->flags & IFF_UP) | |
286 | return netdev_priv(dev); | |
749c10f9 | 287 | |
1da177e4 LT |
288 | return NULL; |
289 | } | |
290 | ||
f57e7d5a PE |
291 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
292 | struct ip_tunnel_parm *parms) | |
1da177e4 | 293 | { |
5056a1ef YH |
294 | __be32 remote = parms->iph.daddr; |
295 | __be32 local = parms->iph.saddr; | |
296 | __be32 key = parms->i_key; | |
1da177e4 LT |
297 | unsigned h = HASH(key); |
298 | int prio = 0; | |
299 | ||
300 | if (local) | |
301 | prio |= 1; | |
f97c1e0c | 302 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
303 | prio |= 2; |
304 | h ^= HASH(remote); | |
305 | } | |
306 | ||
eb8ce741 | 307 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
308 | } |
309 | ||
f57e7d5a PE |
310 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
311 | struct ip_tunnel *t) | |
5056a1ef | 312 | { |
f57e7d5a | 313 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
314 | } |
315 | ||
f57e7d5a | 316 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 317 | { |
f57e7d5a | 318 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
1da177e4 | 319 | |
8d5b2c08 | 320 | spin_lock_bh(&ipgre_lock); |
1da177e4 | 321 | t->next = *tp; |
8d5b2c08 ED |
322 | rcu_assign_pointer(*tp, t); |
323 | spin_unlock_bh(&ipgre_lock); | |
1da177e4 LT |
324 | } |
325 | ||
f57e7d5a | 326 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 LT |
327 | { |
328 | struct ip_tunnel **tp; | |
329 | ||
f57e7d5a | 330 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
1da177e4 | 331 | if (t == *tp) { |
8d5b2c08 | 332 | spin_lock_bh(&ipgre_lock); |
1da177e4 | 333 | *tp = t->next; |
8d5b2c08 | 334 | spin_unlock_bh(&ipgre_lock); |
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; |
e1a80002 HX |
348 | struct ip_tunnel *t, **tp; |
349 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
350 | ||
351 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) | |
352 | if (local == t->parms.iph.saddr && | |
353 | remote == t->parms.iph.daddr && | |
354 | key == t->parms.i_key && | |
749c10f9 | 355 | link == t->parms.link && |
e1a80002 HX |
356 | type == t->dev->type) |
357 | break; | |
358 | ||
359 | return t; | |
360 | } | |
361 | ||
362 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, | |
363 | struct ip_tunnel_parm *parms, int create) | |
364 | { | |
365 | struct ip_tunnel *t, *nt; | |
1da177e4 | 366 | struct net_device *dev; |
1da177e4 | 367 | char name[IFNAMSIZ]; |
f57e7d5a | 368 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 369 | |
e1a80002 HX |
370 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
371 | if (t || !create) | |
372 | return t; | |
1da177e4 LT |
373 | |
374 | if (parms->name[0]) | |
375 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
376 | else |
377 | sprintf(name, "gre%%d"); | |
1da177e4 LT |
378 | |
379 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
380 | if (!dev) | |
381 | return NULL; | |
382 | ||
0b67eceb PE |
383 | dev_net_set(dev, net); |
384 | ||
b37d428b PE |
385 | if (strchr(name, '%')) { |
386 | if (dev_alloc_name(dev, name) < 0) | |
387 | goto failed_free; | |
388 | } | |
389 | ||
2941a486 | 390 | nt = netdev_priv(dev); |
1da177e4 | 391 | nt->parms = *parms; |
c19e654d | 392 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 393 | |
42aa9162 HX |
394 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
395 | ||
b37d428b PE |
396 | if (register_netdevice(dev) < 0) |
397 | goto failed_free; | |
1da177e4 | 398 | |
1da177e4 | 399 | dev_hold(dev); |
f57e7d5a | 400 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
401 | return nt; |
402 | ||
b37d428b PE |
403 | failed_free: |
404 | free_netdev(dev); | |
1da177e4 LT |
405 | return NULL; |
406 | } | |
407 | ||
408 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
409 | { | |
f57e7d5a PE |
410 | struct net *net = dev_net(dev); |
411 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
412 | ||
413 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
414 | dev_put(dev); |
415 | } | |
416 | ||
417 | ||
418 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
419 | { | |
1da177e4 | 420 | |
071f92d0 | 421 | /* All the routers (except for Linux) return only |
1da177e4 LT |
422 | 8 bytes of packet payload. It means, that precise relaying of |
423 | ICMP in the real Internet is absolutely infeasible. | |
424 | ||
425 | Moreover, Cisco "wise men" put GRE key to the third word | |
426 | in GRE header. It makes impossible maintaining even soft state for keyed | |
427 | GRE tunnels with enabled checksum. Tell them "thank you". | |
428 | ||
429 | Well, I wonder, rfc1812 was written by Cisco employee, | |
430 | what the hell these idiots break standrads established | |
431 | by themself??? | |
432 | */ | |
433 | ||
6ed2533e | 434 | struct iphdr *iph = (struct iphdr *)skb->data; |
d5a0a1e3 | 435 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 436 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
437 | const int type = icmp_hdr(skb)->type; |
438 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 439 | struct ip_tunnel *t; |
d5a0a1e3 | 440 | __be16 flags; |
1da177e4 LT |
441 | |
442 | flags = p[0]; | |
443 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
444 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
445 | return; | |
446 | if (flags&GRE_KEY) { | |
447 | grehlen += 4; | |
448 | if (flags&GRE_CSUM) | |
449 | grehlen += 4; | |
450 | } | |
451 | } | |
452 | ||
453 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
454 | if (skb_headlen(skb) < grehlen) | |
455 | return; | |
456 | ||
457 | switch (type) { | |
458 | default: | |
459 | case ICMP_PARAMETERPROB: | |
460 | return; | |
461 | ||
462 | case ICMP_DEST_UNREACH: | |
463 | switch (code) { | |
464 | case ICMP_SR_FAILED: | |
465 | case ICMP_PORT_UNREACH: | |
466 | /* Impossible event. */ | |
467 | return; | |
468 | case ICMP_FRAG_NEEDED: | |
469 | /* Soft state for pmtu is maintained by IP core. */ | |
470 | return; | |
471 | default: | |
472 | /* All others are translated to HOST_UNREACH. | |
473 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
474 | I believe they are just ether pollution. --ANK | |
475 | */ | |
476 | break; | |
477 | } | |
478 | break; | |
479 | case ICMP_TIME_EXCEEDED: | |
480 | if (code != ICMP_EXC_TTL) | |
481 | return; | |
482 | break; | |
483 | } | |
484 | ||
8d5b2c08 | 485 | rcu_read_lock(); |
749c10f9 | 486 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
487 | flags & GRE_KEY ? |
488 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
489 | p[1]); | |
f97c1e0c JP |
490 | if (t == NULL || t->parms.iph.daddr == 0 || |
491 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
492 | goto out; |
493 | ||
494 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
495 | goto out; | |
496 | ||
da6185d8 | 497 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
498 | t->err_count++; |
499 | else | |
500 | t->err_count = 1; | |
501 | t->err_time = jiffies; | |
502 | out: | |
8d5b2c08 | 503 | rcu_read_unlock(); |
1da177e4 | 504 | return; |
1da177e4 LT |
505 | } |
506 | ||
507 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
508 | { | |
509 | if (INET_ECN_is_ce(iph->tos)) { | |
510 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 511 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 512 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 513 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
514 | } |
515 | } | |
516 | } | |
517 | ||
518 | static inline u8 | |
519 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) | |
520 | { | |
521 | u8 inner = 0; | |
522 | if (skb->protocol == htons(ETH_P_IP)) | |
523 | inner = old_iph->tos; | |
524 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
525 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); | |
526 | return INET_ECN_encapsulate(tos, inner); | |
527 | } | |
528 | ||
529 | static int ipgre_rcv(struct sk_buff *skb) | |
530 | { | |
531 | struct iphdr *iph; | |
532 | u8 *h; | |
d5a0a1e3 | 533 | __be16 flags; |
d3bc23e7 | 534 | __sum16 csum = 0; |
d5a0a1e3 | 535 | __be32 key = 0; |
1da177e4 LT |
536 | u32 seqno = 0; |
537 | struct ip_tunnel *tunnel; | |
538 | int offset = 4; | |
e1a80002 | 539 | __be16 gre_proto; |
64194c31 | 540 | unsigned int len; |
1da177e4 LT |
541 | |
542 | if (!pskb_may_pull(skb, 16)) | |
543 | goto drop_nolock; | |
544 | ||
eddc9ec5 | 545 | iph = ip_hdr(skb); |
1da177e4 | 546 | h = skb->data; |
d5a0a1e3 | 547 | flags = *(__be16*)h; |
1da177e4 LT |
548 | |
549 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
550 | /* - Version must be 0. | |
551 | - We do not support routing headers. | |
552 | */ | |
553 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
554 | goto drop_nolock; | |
555 | ||
556 | if (flags&GRE_CSUM) { | |
fb286bb2 | 557 | switch (skb->ip_summed) { |
84fa7933 | 558 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 559 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
560 | if (!csum) |
561 | break; | |
562 | /* fall through */ | |
563 | case CHECKSUM_NONE: | |
564 | skb->csum = 0; | |
565 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 566 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
567 | } |
568 | offset += 4; | |
569 | } | |
570 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 571 | key = *(__be32*)(h + offset); |
1da177e4 LT |
572 | offset += 4; |
573 | } | |
574 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 575 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
576 | offset += 4; |
577 | } | |
578 | } | |
579 | ||
e1a80002 HX |
580 | gre_proto = *(__be16 *)(h + 2); |
581 | ||
8d5b2c08 | 582 | rcu_read_lock(); |
749c10f9 | 583 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
584 | iph->saddr, iph->daddr, key, |
585 | gre_proto))) { | |
addd68eb PE |
586 | struct net_device_stats *stats = &tunnel->dev->stats; |
587 | ||
1da177e4 LT |
588 | secpath_reset(skb); |
589 | ||
e1a80002 | 590 | skb->protocol = gre_proto; |
1da177e4 LT |
591 | /* WCCP version 1 and 2 protocol decoding. |
592 | * - Change protocol to IP | |
593 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
594 | */ | |
e1a80002 | 595 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 596 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 597 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
598 | offset += 4; |
599 | } | |
600 | ||
1d069167 | 601 | skb->mac_header = skb->network_header; |
4209fb60 | 602 | __pskb_pull(skb, offset); |
9c70220b | 603 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
604 | skb->pkt_type = PACKET_HOST; |
605 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 606 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 607 | /* Looped back packet, drop it! */ |
511c3f92 | 608 | if (skb_rtable(skb)->fl.iif == 0) |
1da177e4 | 609 | goto drop; |
addd68eb | 610 | stats->multicast++; |
1da177e4 LT |
611 | skb->pkt_type = PACKET_BROADCAST; |
612 | } | |
613 | #endif | |
614 | ||
615 | if (((flags&GRE_CSUM) && csum) || | |
616 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
addd68eb PE |
617 | stats->rx_crc_errors++; |
618 | stats->rx_errors++; | |
1da177e4 LT |
619 | goto drop; |
620 | } | |
621 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
622 | if (!(flags&GRE_SEQ) || | |
623 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
addd68eb PE |
624 | stats->rx_fifo_errors++; |
625 | stats->rx_errors++; | |
1da177e4 LT |
626 | goto drop; |
627 | } | |
628 | tunnel->i_seqno = seqno + 1; | |
629 | } | |
e1a80002 | 630 | |
64194c31 HX |
631 | len = skb->len; |
632 | ||
e1a80002 HX |
633 | /* Warning: All skb pointers will be invalidated! */ |
634 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
635 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
636 | stats->rx_length_errors++; | |
637 | stats->rx_errors++; | |
638 | goto drop; | |
639 | } | |
640 | ||
641 | iph = ip_hdr(skb); | |
642 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
643 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
644 | } | |
645 | ||
addd68eb | 646 | stats->rx_packets++; |
64194c31 | 647 | stats->rx_bytes += len; |
1da177e4 | 648 | skb->dev = tunnel->dev; |
adf30907 | 649 | skb_dst_drop(skb); |
1da177e4 | 650 | nf_reset(skb); |
e1a80002 HX |
651 | |
652 | skb_reset_network_header(skb); | |
1da177e4 | 653 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 654 | |
1da177e4 | 655 | netif_rx(skb); |
8d5b2c08 | 656 | rcu_read_unlock(); |
1da177e4 LT |
657 | return(0); |
658 | } | |
45af08be | 659 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
660 | |
661 | drop: | |
8d5b2c08 | 662 | rcu_read_unlock(); |
1da177e4 LT |
663 | drop_nolock: |
664 | kfree_skb(skb); | |
665 | return(0); | |
666 | } | |
667 | ||
6fef4c0c | 668 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 669 | { |
2941a486 | 670 | struct ip_tunnel *tunnel = netdev_priv(dev); |
0bfbedb1 ED |
671 | struct net_device_stats *stats = &dev->stats; |
672 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
eddc9ec5 | 673 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 LT |
674 | struct iphdr *tiph; |
675 | u8 tos; | |
d5a0a1e3 | 676 | __be16 df; |
1da177e4 LT |
677 | struct rtable *rt; /* Route to the other host */ |
678 | struct net_device *tdev; /* Device to other host */ | |
679 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 680 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 681 | int gre_hlen; |
d5a0a1e3 | 682 | __be32 dst; |
1da177e4 LT |
683 | int mtu; |
684 | ||
e1a80002 HX |
685 | if (dev->type == ARPHRD_ETHER) |
686 | IPCB(skb)->flags = 0; | |
687 | ||
688 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 689 | gre_hlen = 0; |
6ed2533e | 690 | tiph = (struct iphdr *)skb->data; |
1da177e4 LT |
691 | } else { |
692 | gre_hlen = tunnel->hlen; | |
693 | tiph = &tunnel->parms.iph; | |
694 | } | |
695 | ||
696 | if ((dst = tiph->daddr) == 0) { | |
697 | /* NBMA tunnel */ | |
698 | ||
adf30907 | 699 | if (skb_dst(skb) == NULL) { |
addd68eb | 700 | stats->tx_fifo_errors++; |
1da177e4 LT |
701 | goto tx_error; |
702 | } | |
703 | ||
704 | if (skb->protocol == htons(ETH_P_IP)) { | |
511c3f92 | 705 | rt = skb_rtable(skb); |
1da177e4 LT |
706 | if ((dst = rt->rt_gateway) == 0) |
707 | goto tx_error_icmp; | |
708 | } | |
709 | #ifdef CONFIG_IPV6 | |
710 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
711 | struct in6_addr *addr6; | |
712 | int addr_type; | |
adf30907 | 713 | struct neighbour *neigh = skb_dst(skb)->neighbour; |
1da177e4 LT |
714 | |
715 | if (neigh == NULL) | |
716 | goto tx_error; | |
717 | ||
6ed2533e | 718 | addr6 = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
719 | addr_type = ipv6_addr_type(addr6); |
720 | ||
721 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 722 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
723 | addr_type = ipv6_addr_type(addr6); |
724 | } | |
725 | ||
726 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
727 | goto tx_error_icmp; | |
728 | ||
729 | dst = addr6->s6_addr32[3]; | |
730 | } | |
731 | #endif | |
732 | else | |
733 | goto tx_error; | |
734 | } | |
735 | ||
736 | tos = tiph->tos; | |
ee686ca9 AJ |
737 | if (tos == 1) { |
738 | tos = 0; | |
1da177e4 LT |
739 | if (skb->protocol == htons(ETH_P_IP)) |
740 | tos = old_iph->tos; | |
1da177e4 LT |
741 | } |
742 | ||
743 | { | |
744 | struct flowi fl = { .oif = tunnel->parms.link, | |
745 | .nl_u = { .ip4_u = | |
746 | { .daddr = dst, | |
747 | .saddr = tiph->saddr, | |
748 | .tos = RT_TOS(tos) } }, | |
749 | .proto = IPPROTO_GRE }; | |
96635522 | 750 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
addd68eb | 751 | stats->tx_carrier_errors++; |
1da177e4 LT |
752 | goto tx_error; |
753 | } | |
754 | } | |
755 | tdev = rt->u.dst.dev; | |
756 | ||
757 | if (tdev == dev) { | |
758 | ip_rt_put(rt); | |
addd68eb | 759 | stats->collisions++; |
1da177e4 LT |
760 | goto tx_error; |
761 | } | |
762 | ||
763 | df = tiph->frag_off; | |
764 | if (df) | |
c95b819a | 765 | mtu = dst_mtu(&rt->u.dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 | 766 | else |
adf30907 | 767 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 | 768 | |
adf30907 ED |
769 | if (skb_dst(skb)) |
770 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
771 | |
772 | if (skb->protocol == htons(ETH_P_IP)) { | |
773 | df |= (old_iph->frag_off&htons(IP_DF)); | |
774 | ||
775 | if ((old_iph->frag_off&htons(IP_DF)) && | |
776 | mtu < ntohs(old_iph->tot_len)) { | |
777 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
778 | ip_rt_put(rt); | |
779 | goto tx_error; | |
780 | } | |
781 | } | |
782 | #ifdef CONFIG_IPV6 | |
783 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
adf30907 | 784 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
1da177e4 | 785 | |
adf30907 | 786 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
f97c1e0c JP |
787 | if ((tunnel->parms.iph.daddr && |
788 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
789 | rt6->rt6i_dst.plen == 128) { |
790 | rt6->rt6i_flags |= RTF_MODIFIED; | |
adf30907 | 791 | skb_dst(skb)->metrics[RTAX_MTU-1] = mtu; |
1da177e4 LT |
792 | } |
793 | } | |
794 | ||
795 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
796 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
797 | ip_rt_put(rt); | |
798 | goto tx_error; | |
799 | } | |
800 | } | |
801 | #endif | |
802 | ||
803 | if (tunnel->err_count > 0) { | |
da6185d8 WY |
804 | if (time_before(jiffies, |
805 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
806 | tunnel->err_count--; |
807 | ||
808 | dst_link_failure(skb); | |
809 | } else | |
810 | tunnel->err_count = 0; | |
811 | } | |
812 | ||
813 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; | |
814 | ||
cfbba49d PM |
815 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
816 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
817 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
818 | if (!new_skb) { | |
819 | ip_rt_put(rt); | |
0bfbedb1 | 820 | txq->tx_dropped++; |
1da177e4 | 821 | dev_kfree_skb(skb); |
6ed10654 | 822 | return NETDEV_TX_OK; |
1da177e4 LT |
823 | } |
824 | if (skb->sk) | |
825 | skb_set_owner_w(new_skb, skb->sk); | |
826 | dev_kfree_skb(skb); | |
827 | skb = new_skb; | |
eddc9ec5 | 828 | old_iph = ip_hdr(skb); |
1da177e4 LT |
829 | } |
830 | ||
64194c31 | 831 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
832 | skb_push(skb, gre_hlen); |
833 | skb_reset_network_header(skb); | |
1da177e4 | 834 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
835 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
836 | IPSKB_REROUTED); | |
adf30907 ED |
837 | skb_dst_drop(skb); |
838 | skb_dst_set(skb, &rt->u.dst); | |
1da177e4 LT |
839 | |
840 | /* | |
841 | * Push down and install the IPIP header. | |
842 | */ | |
843 | ||
eddc9ec5 | 844 | iph = ip_hdr(skb); |
1da177e4 LT |
845 | iph->version = 4; |
846 | iph->ihl = sizeof(struct iphdr) >> 2; | |
847 | iph->frag_off = df; | |
848 | iph->protocol = IPPROTO_GRE; | |
849 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
850 | iph->daddr = rt->rt_dst; | |
851 | iph->saddr = rt->rt_src; | |
852 | ||
853 | if ((iph->ttl = tiph->ttl) == 0) { | |
854 | if (skb->protocol == htons(ETH_P_IP)) | |
855 | iph->ttl = old_iph->ttl; | |
856 | #ifdef CONFIG_IPV6 | |
857 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
6ed2533e | 858 | iph->ttl = ((struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
859 | #endif |
860 | else | |
861 | iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); | |
862 | } | |
863 | ||
e1a80002 HX |
864 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
865 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
866 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
867 | |
868 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 869 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
870 | |
871 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
872 | ++tunnel->o_seqno; | |
873 | *ptr = htonl(tunnel->o_seqno); | |
874 | ptr--; | |
875 | } | |
876 | if (tunnel->parms.o_flags&GRE_KEY) { | |
877 | *ptr = tunnel->parms.o_key; | |
878 | ptr--; | |
879 | } | |
880 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
881 | *ptr = 0; | |
5f92a738 | 882 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
883 | } |
884 | } | |
885 | ||
886 | nf_reset(skb); | |
887 | ||
888 | IPTUNNEL_XMIT(); | |
6ed10654 | 889 | return NETDEV_TX_OK; |
1da177e4 LT |
890 | |
891 | tx_error_icmp: | |
892 | dst_link_failure(skb); | |
893 | ||
894 | tx_error: | |
895 | stats->tx_errors++; | |
896 | dev_kfree_skb(skb); | |
6ed10654 | 897 | return NETDEV_TX_OK; |
1da177e4 LT |
898 | } |
899 | ||
42aa9162 | 900 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
901 | { |
902 | struct net_device *tdev = NULL; | |
903 | struct ip_tunnel *tunnel; | |
904 | struct iphdr *iph; | |
905 | int hlen = LL_MAX_HEADER; | |
906 | int mtu = ETH_DATA_LEN; | |
907 | int addend = sizeof(struct iphdr) + 4; | |
908 | ||
909 | tunnel = netdev_priv(dev); | |
910 | iph = &tunnel->parms.iph; | |
911 | ||
c95b819a | 912 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
913 | |
914 | if (iph->daddr) { | |
915 | struct flowi fl = { .oif = tunnel->parms.link, | |
916 | .nl_u = { .ip4_u = | |
917 | { .daddr = iph->daddr, | |
918 | .saddr = iph->saddr, | |
919 | .tos = RT_TOS(iph->tos) } }, | |
920 | .proto = IPPROTO_GRE }; | |
921 | struct rtable *rt; | |
96635522 | 922 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
ee34c1eb MS |
923 | tdev = rt->u.dst.dev; |
924 | ip_rt_put(rt); | |
925 | } | |
e1a80002 HX |
926 | |
927 | if (dev->type != ARPHRD_ETHER) | |
928 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
929 | } |
930 | ||
931 | if (!tdev && tunnel->parms.link) | |
96635522 | 932 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
933 | |
934 | if (tdev) { | |
c95b819a | 935 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
936 | mtu = tdev->mtu; |
937 | } | |
938 | dev->iflink = tunnel->parms.link; | |
939 | ||
940 | /* Precalculate GRE options length */ | |
941 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
942 | if (tunnel->parms.o_flags&GRE_CSUM) | |
943 | addend += 4; | |
944 | if (tunnel->parms.o_flags&GRE_KEY) | |
945 | addend += 4; | |
946 | if (tunnel->parms.o_flags&GRE_SEQ) | |
947 | addend += 4; | |
948 | } | |
c95b819a | 949 | dev->needed_headroom = addend + hlen; |
8cdb0456 | 950 | mtu -= dev->hard_header_len + addend; |
42aa9162 HX |
951 | |
952 | if (mtu < 68) | |
953 | mtu = 68; | |
954 | ||
ee34c1eb MS |
955 | tunnel->hlen = addend; |
956 | ||
42aa9162 | 957 | return mtu; |
ee34c1eb MS |
958 | } |
959 | ||
1da177e4 LT |
960 | static int |
961 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
962 | { | |
963 | int err = 0; | |
964 | struct ip_tunnel_parm p; | |
965 | struct ip_tunnel *t; | |
f57e7d5a PE |
966 | struct net *net = dev_net(dev); |
967 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
968 | |
969 | switch (cmd) { | |
970 | case SIOCGETTUNNEL: | |
971 | t = NULL; | |
7daa0004 | 972 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
973 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
974 | err = -EFAULT; | |
975 | break; | |
976 | } | |
f57e7d5a | 977 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
978 | } |
979 | if (t == NULL) | |
2941a486 | 980 | t = netdev_priv(dev); |
1da177e4 LT |
981 | memcpy(&p, &t->parms, sizeof(p)); |
982 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
983 | err = -EFAULT; | |
984 | break; | |
985 | ||
986 | case SIOCADDTUNNEL: | |
987 | case SIOCCHGTUNNEL: | |
988 | err = -EPERM; | |
989 | if (!capable(CAP_NET_ADMIN)) | |
990 | goto done; | |
991 | ||
992 | err = -EFAULT; | |
993 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
994 | goto done; | |
995 | ||
996 | err = -EINVAL; | |
997 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
998 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
999 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
1000 | goto done; | |
1001 | if (p.iph.ttl) | |
1002 | p.iph.frag_off |= htons(IP_DF); | |
1003 | ||
1004 | if (!(p.i_flags&GRE_KEY)) | |
1005 | p.i_key = 0; | |
1006 | if (!(p.o_flags&GRE_KEY)) | |
1007 | p.o_key = 0; | |
1008 | ||
f57e7d5a | 1009 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1010 | |
7daa0004 | 1011 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1012 | if (t != NULL) { |
1013 | if (t->dev != dev) { | |
1014 | err = -EEXIST; | |
1015 | break; | |
1016 | } | |
1017 | } else { | |
6ed2533e | 1018 | unsigned nflags = 0; |
1da177e4 | 1019 | |
2941a486 | 1020 | t = netdev_priv(dev); |
1da177e4 | 1021 | |
f97c1e0c | 1022 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1023 | nflags = IFF_BROADCAST; |
1024 | else if (p.iph.daddr) | |
1025 | nflags = IFF_POINTOPOINT; | |
1026 | ||
1027 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1028 | err = -EINVAL; | |
1029 | break; | |
1030 | } | |
f57e7d5a | 1031 | ipgre_tunnel_unlink(ign, t); |
1da177e4 LT |
1032 | t->parms.iph.saddr = p.iph.saddr; |
1033 | t->parms.iph.daddr = p.iph.daddr; | |
1034 | t->parms.i_key = p.i_key; | |
1035 | t->parms.o_key = p.o_key; | |
1036 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1037 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1038 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1039 | netdev_state_change(dev); |
1040 | } | |
1041 | } | |
1042 | ||
1043 | if (t) { | |
1044 | err = 0; | |
1045 | if (cmd == SIOCCHGTUNNEL) { | |
1046 | t->parms.iph.ttl = p.iph.ttl; | |
1047 | t->parms.iph.tos = p.iph.tos; | |
1048 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1049 | if (t->parms.link != p.link) { |
1050 | t->parms.link = p.link; | |
42aa9162 | 1051 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1052 | netdev_state_change(dev); |
1053 | } | |
1da177e4 LT |
1054 | } |
1055 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1056 | err = -EFAULT; | |
1057 | } else | |
1058 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1059 | break; | |
1060 | ||
1061 | case SIOCDELTUNNEL: | |
1062 | err = -EPERM; | |
1063 | if (!capable(CAP_NET_ADMIN)) | |
1064 | goto done; | |
1065 | ||
7daa0004 | 1066 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1067 | err = -EFAULT; |
1068 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1069 | goto done; | |
1070 | err = -ENOENT; | |
f57e7d5a | 1071 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1072 | goto done; |
1073 | err = -EPERM; | |
7daa0004 | 1074 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1075 | goto done; |
1076 | dev = t->dev; | |
1077 | } | |
22f8cde5 SH |
1078 | unregister_netdevice(dev); |
1079 | err = 0; | |
1da177e4 LT |
1080 | break; |
1081 | ||
1082 | default: | |
1083 | err = -EINVAL; | |
1084 | } | |
1085 | ||
1086 | done: | |
1087 | return err; | |
1088 | } | |
1089 | ||
1da177e4 LT |
1090 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1091 | { | |
2941a486 | 1092 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1093 | if (new_mtu < 68 || |
1094 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1095 | return -EINVAL; |
1096 | dev->mtu = new_mtu; | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1da177e4 LT |
1100 | /* Nice toy. Unfortunately, useless in real life :-) |
1101 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1102 | over the Internet, provided multicast routing is tuned. | |
1103 | ||
1104 | ||
1105 | I have no idea was this bicycle invented before me, | |
1106 | so that I had to set ARPHRD_IPGRE to a random value. | |
1107 | I have an impression, that Cisco could make something similar, | |
1108 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1109 | |
1da177e4 LT |
1110 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1111 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1112 | ||
1113 | ping -t 255 224.66.66.66 | |
1114 | ||
1115 | If nobody answers, mbone does not work. | |
1116 | ||
1117 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1118 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1119 | ifconfig Universe up | |
1120 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1121 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1122 | ftp 10.66.66.66 | |
1123 | ... | |
1124 | ftp fec0:6666:6666::193.233.7.65 | |
1125 | ... | |
1126 | ||
1127 | */ | |
1128 | ||
3b04ddde SH |
1129 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1130 | unsigned short type, | |
1131 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 | 1132 | { |
2941a486 | 1133 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1134 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1135 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1136 | |
1137 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1138 | p[0] = t->parms.o_flags; | |
1139 | p[1] = htons(type); | |
1140 | ||
1141 | /* | |
e905a9ed | 1142 | * Set the source hardware address. |
1da177e4 | 1143 | */ |
e905a9ed | 1144 | |
1da177e4 LT |
1145 | if (saddr) |
1146 | memcpy(&iph->saddr, saddr, 4); | |
1147 | ||
1148 | if (daddr) { | |
1149 | memcpy(&iph->daddr, daddr, 4); | |
1150 | return t->hlen; | |
1151 | } | |
f97c1e0c | 1152 | if (iph->daddr && !ipv4_is_multicast(iph->daddr)) |
1da177e4 | 1153 | return t->hlen; |
e905a9ed | 1154 | |
1da177e4 LT |
1155 | return -t->hlen; |
1156 | } | |
1157 | ||
6a5f44d7 TT |
1158 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1159 | { | |
6ed2533e | 1160 | struct iphdr *iph = (struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1161 | memcpy(haddr, &iph->saddr, 4); |
1162 | return 4; | |
1163 | } | |
1164 | ||
3b04ddde SH |
1165 | static const struct header_ops ipgre_header_ops = { |
1166 | .create = ipgre_header, | |
6a5f44d7 | 1167 | .parse = ipgre_header_parse, |
3b04ddde SH |
1168 | }; |
1169 | ||
6a5f44d7 | 1170 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1171 | static int ipgre_open(struct net_device *dev) |
1172 | { | |
2941a486 | 1173 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1174 | |
f97c1e0c | 1175 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
1da177e4 LT |
1176 | struct flowi fl = { .oif = t->parms.link, |
1177 | .nl_u = { .ip4_u = | |
1178 | { .daddr = t->parms.iph.daddr, | |
1179 | .saddr = t->parms.iph.saddr, | |
1180 | .tos = RT_TOS(t->parms.iph.tos) } }, | |
1181 | .proto = IPPROTO_GRE }; | |
1182 | struct rtable *rt; | |
96635522 | 1183 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
1da177e4 LT |
1184 | return -EADDRNOTAVAIL; |
1185 | dev = rt->u.dst.dev; | |
1186 | ip_rt_put(rt); | |
e5ed6399 | 1187 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1188 | return -EADDRNOTAVAIL; |
1189 | t->mlink = dev->ifindex; | |
e5ed6399 | 1190 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1191 | } |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | static int ipgre_close(struct net_device *dev) | |
1196 | { | |
2941a486 | 1197 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1198 | |
f97c1e0c | 1199 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1200 | struct in_device *in_dev; |
c346dca1 | 1201 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
1da177e4 LT |
1202 | if (in_dev) { |
1203 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); | |
1204 | in_dev_put(in_dev); | |
1205 | } | |
1206 | } | |
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | #endif | |
1211 | ||
b8c26a33 SH |
1212 | static const struct net_device_ops ipgre_netdev_ops = { |
1213 | .ndo_init = ipgre_tunnel_init, | |
1214 | .ndo_uninit = ipgre_tunnel_uninit, | |
1215 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1216 | .ndo_open = ipgre_open, | |
1217 | .ndo_stop = ipgre_close, | |
1218 | #endif | |
1219 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1220 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1221 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
1222 | }; | |
1223 | ||
1da177e4 LT |
1224 | static void ipgre_tunnel_setup(struct net_device *dev) |
1225 | { | |
b8c26a33 | 1226 | dev->netdev_ops = &ipgre_netdev_ops; |
1da177e4 | 1227 | dev->destructor = free_netdev; |
1da177e4 LT |
1228 | |
1229 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1230 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1231 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1232 | dev->flags = IFF_NOARP; |
1233 | dev->iflink = 0; | |
1234 | dev->addr_len = 4; | |
0b67eceb | 1235 | dev->features |= NETIF_F_NETNS_LOCAL; |
108bfa89 | 1236 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1237 | } |
1238 | ||
1239 | static int ipgre_tunnel_init(struct net_device *dev) | |
1240 | { | |
1da177e4 LT |
1241 | struct ip_tunnel *tunnel; |
1242 | struct iphdr *iph; | |
1da177e4 | 1243 | |
2941a486 | 1244 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1245 | iph = &tunnel->parms.iph; |
1246 | ||
1247 | tunnel->dev = dev; | |
1248 | strcpy(tunnel->parms.name, dev->name); | |
1249 | ||
1250 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1251 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1252 | ||
1da177e4 | 1253 | if (iph->daddr) { |
1da177e4 | 1254 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1255 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1256 | if (!iph->saddr) |
1257 | return -EINVAL; | |
1258 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1259 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1260 | } |
1261 | #endif | |
ee34c1eb | 1262 | } else |
6a5f44d7 | 1263 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1264 | |
1da177e4 LT |
1265 | return 0; |
1266 | } | |
1267 | ||
b8c26a33 | 1268 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1269 | { |
2941a486 | 1270 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1271 | struct iphdr *iph = &tunnel->parms.iph; |
eb8ce741 | 1272 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
1da177e4 LT |
1273 | |
1274 | tunnel->dev = dev; | |
1275 | strcpy(tunnel->parms.name, dev->name); | |
1276 | ||
1277 | iph->version = 4; | |
1278 | iph->protocol = IPPROTO_GRE; | |
1279 | iph->ihl = 5; | |
1280 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1281 | ||
1282 | dev_hold(dev); | |
eb8ce741 | 1283 | ign->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | ||
32613090 | 1287 | static const struct net_protocol ipgre_protocol = { |
1da177e4 LT |
1288 | .handler = ipgre_rcv, |
1289 | .err_handler = ipgre_err, | |
f96c148f | 1290 | .netns_ok = 1, |
1da177e4 LT |
1291 | }; |
1292 | ||
eef6dd65 | 1293 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
eb8ce741 PE |
1294 | { |
1295 | int prio; | |
1296 | ||
1297 | for (prio = 0; prio < 4; prio++) { | |
1298 | int h; | |
1299 | for (h = 0; h < HASH_SIZE; h++) { | |
eef6dd65 ED |
1300 | struct ip_tunnel *t = ign->tunnels[prio][h]; |
1301 | ||
1302 | while (t != NULL) { | |
1303 | unregister_netdevice_queue(t->dev, head); | |
1304 | t = t->next; | |
1305 | } | |
eb8ce741 PE |
1306 | } |
1307 | } | |
1308 | } | |
1309 | ||
59a4c759 PE |
1310 | static int ipgre_init_net(struct net *net) |
1311 | { | |
1312 | int err; | |
1313 | struct ipgre_net *ign; | |
1314 | ||
1315 | err = -ENOMEM; | |
eb8ce741 | 1316 | ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL); |
59a4c759 PE |
1317 | if (ign == NULL) |
1318 | goto err_alloc; | |
1319 | ||
1320 | err = net_assign_generic(net, ipgre_net_id, ign); | |
1321 | if (err < 0) | |
1322 | goto err_assign; | |
1323 | ||
7daa0004 PE |
1324 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1325 | ipgre_tunnel_setup); | |
1326 | if (!ign->fb_tunnel_dev) { | |
1327 | err = -ENOMEM; | |
1328 | goto err_alloc_dev; | |
1329 | } | |
be77e593 | 1330 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1331 | |
b8c26a33 | 1332 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1333 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1334 | |
1335 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1336 | goto err_reg_dev; | |
1337 | ||
59a4c759 PE |
1338 | return 0; |
1339 | ||
7daa0004 PE |
1340 | err_reg_dev: |
1341 | free_netdev(ign->fb_tunnel_dev); | |
1342 | err_alloc_dev: | |
1343 | /* nothing */ | |
59a4c759 PE |
1344 | err_assign: |
1345 | kfree(ign); | |
1346 | err_alloc: | |
1347 | return err; | |
1348 | } | |
1349 | ||
1350 | static void ipgre_exit_net(struct net *net) | |
1351 | { | |
1352 | struct ipgre_net *ign; | |
eef6dd65 | 1353 | LIST_HEAD(list); |
59a4c759 PE |
1354 | |
1355 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1356 | rtnl_lock(); |
eef6dd65 ED |
1357 | ipgre_destroy_tunnels(ign, &list); |
1358 | unregister_netdevice_many(&list); | |
7daa0004 | 1359 | rtnl_unlock(); |
59a4c759 PE |
1360 | kfree(ign); |
1361 | } | |
1362 | ||
1363 | static struct pernet_operations ipgre_net_ops = { | |
1364 | .init = ipgre_init_net, | |
1365 | .exit = ipgre_exit_net, | |
1366 | }; | |
1da177e4 | 1367 | |
c19e654d HX |
1368 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1369 | { | |
1370 | __be16 flags; | |
1371 | ||
1372 | if (!data) | |
1373 | return 0; | |
1374 | ||
1375 | flags = 0; | |
1376 | if (data[IFLA_GRE_IFLAGS]) | |
1377 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1378 | if (data[IFLA_GRE_OFLAGS]) | |
1379 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1380 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1381 | return -EINVAL; | |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
e1a80002 HX |
1386 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1387 | { | |
1388 | __be32 daddr; | |
1389 | ||
1390 | if (tb[IFLA_ADDRESS]) { | |
1391 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1392 | return -EINVAL; | |
1393 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1394 | return -EADDRNOTAVAIL; | |
1395 | } | |
1396 | ||
1397 | if (!data) | |
1398 | goto out; | |
1399 | ||
1400 | if (data[IFLA_GRE_REMOTE]) { | |
1401 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1402 | if (!daddr) | |
1403 | return -EINVAL; | |
1404 | } | |
1405 | ||
1406 | out: | |
1407 | return ipgre_tunnel_validate(tb, data); | |
1408 | } | |
1409 | ||
c19e654d HX |
1410 | static void ipgre_netlink_parms(struct nlattr *data[], |
1411 | struct ip_tunnel_parm *parms) | |
1412 | { | |
7bb82d92 | 1413 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1414 | |
1415 | parms->iph.protocol = IPPROTO_GRE; | |
1416 | ||
1417 | if (!data) | |
1418 | return; | |
1419 | ||
1420 | if (data[IFLA_GRE_LINK]) | |
1421 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1422 | ||
1423 | if (data[IFLA_GRE_IFLAGS]) | |
1424 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1425 | ||
1426 | if (data[IFLA_GRE_OFLAGS]) | |
1427 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1428 | ||
1429 | if (data[IFLA_GRE_IKEY]) | |
1430 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1431 | ||
1432 | if (data[IFLA_GRE_OKEY]) | |
1433 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1434 | ||
1435 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1436 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1437 | |
1438 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1439 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1440 | |
1441 | if (data[IFLA_GRE_TTL]) | |
1442 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1443 | ||
1444 | if (data[IFLA_GRE_TOS]) | |
1445 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1446 | ||
1447 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1448 | parms->iph.frag_off = htons(IP_DF); | |
1449 | } | |
1450 | ||
e1a80002 HX |
1451 | static int ipgre_tap_init(struct net_device *dev) |
1452 | { | |
1453 | struct ip_tunnel *tunnel; | |
1454 | ||
1455 | tunnel = netdev_priv(dev); | |
1456 | ||
1457 | tunnel->dev = dev; | |
1458 | strcpy(tunnel->parms.name, dev->name); | |
1459 | ||
1460 | ipgre_tunnel_bind_dev(dev); | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
b8c26a33 SH |
1465 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1466 | .ndo_init = ipgre_tap_init, | |
1467 | .ndo_uninit = ipgre_tunnel_uninit, | |
1468 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1469 | .ndo_set_mac_address = eth_mac_addr, | |
1470 | .ndo_validate_addr = eth_validate_addr, | |
1471 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
1472 | }; | |
1473 | ||
e1a80002 HX |
1474 | static void ipgre_tap_setup(struct net_device *dev) |
1475 | { | |
1476 | ||
1477 | ether_setup(dev); | |
1478 | ||
2e9526b3 | 1479 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
e1a80002 | 1480 | dev->destructor = free_netdev; |
e1a80002 HX |
1481 | |
1482 | dev->iflink = 0; | |
1483 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1484 | } | |
1485 | ||
81adee47 | 1486 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
c19e654d HX |
1487 | struct nlattr *data[]) |
1488 | { | |
1489 | struct ip_tunnel *nt; | |
1490 | struct net *net = dev_net(dev); | |
1491 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1492 | int mtu; | |
1493 | int err; | |
1494 | ||
1495 | nt = netdev_priv(dev); | |
1496 | ipgre_netlink_parms(data, &nt->parms); | |
1497 | ||
e1a80002 | 1498 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1499 | return -EEXIST; |
1500 | ||
e1a80002 HX |
1501 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1502 | random_ether_addr(dev->dev_addr); | |
1503 | ||
c19e654d HX |
1504 | mtu = ipgre_tunnel_bind_dev(dev); |
1505 | if (!tb[IFLA_MTU]) | |
1506 | dev->mtu = mtu; | |
1507 | ||
1508 | err = register_netdevice(dev); | |
1509 | if (err) | |
1510 | goto out; | |
1511 | ||
1512 | dev_hold(dev); | |
1513 | ipgre_tunnel_link(ign, nt); | |
1514 | ||
1515 | out: | |
1516 | return err; | |
1517 | } | |
1518 | ||
1519 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1520 | struct nlattr *data[]) | |
1521 | { | |
1522 | struct ip_tunnel *t, *nt; | |
1523 | struct net *net = dev_net(dev); | |
1524 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1525 | struct ip_tunnel_parm p; | |
1526 | int mtu; | |
1527 | ||
1528 | if (dev == ign->fb_tunnel_dev) | |
1529 | return -EINVAL; | |
1530 | ||
1531 | nt = netdev_priv(dev); | |
1532 | ipgre_netlink_parms(data, &p); | |
1533 | ||
1534 | t = ipgre_tunnel_locate(net, &p, 0); | |
1535 | ||
1536 | if (t) { | |
1537 | if (t->dev != dev) | |
1538 | return -EEXIST; | |
1539 | } else { | |
c19e654d HX |
1540 | t = nt; |
1541 | ||
2e9526b3 HX |
1542 | if (dev->type != ARPHRD_ETHER) { |
1543 | unsigned nflags = 0; | |
c19e654d | 1544 | |
2e9526b3 HX |
1545 | if (ipv4_is_multicast(p.iph.daddr)) |
1546 | nflags = IFF_BROADCAST; | |
1547 | else if (p.iph.daddr) | |
1548 | nflags = IFF_POINTOPOINT; | |
1549 | ||
1550 | if ((dev->flags ^ nflags) & | |
1551 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1552 | return -EINVAL; | |
1553 | } | |
c19e654d HX |
1554 | |
1555 | ipgre_tunnel_unlink(ign, t); | |
1556 | t->parms.iph.saddr = p.iph.saddr; | |
1557 | t->parms.iph.daddr = p.iph.daddr; | |
1558 | t->parms.i_key = p.i_key; | |
2e9526b3 HX |
1559 | if (dev->type != ARPHRD_ETHER) { |
1560 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1561 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1562 | } | |
c19e654d HX |
1563 | ipgre_tunnel_link(ign, t); |
1564 | netdev_state_change(dev); | |
1565 | } | |
1566 | ||
1567 | t->parms.o_key = p.o_key; | |
1568 | t->parms.iph.ttl = p.iph.ttl; | |
1569 | t->parms.iph.tos = p.iph.tos; | |
1570 | t->parms.iph.frag_off = p.iph.frag_off; | |
1571 | ||
1572 | if (t->parms.link != p.link) { | |
1573 | t->parms.link = p.link; | |
1574 | mtu = ipgre_tunnel_bind_dev(dev); | |
1575 | if (!tb[IFLA_MTU]) | |
1576 | dev->mtu = mtu; | |
1577 | netdev_state_change(dev); | |
1578 | } | |
1579 | ||
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | static size_t ipgre_get_size(const struct net_device *dev) | |
1584 | { | |
1585 | return | |
1586 | /* IFLA_GRE_LINK */ | |
1587 | nla_total_size(4) + | |
1588 | /* IFLA_GRE_IFLAGS */ | |
1589 | nla_total_size(2) + | |
1590 | /* IFLA_GRE_OFLAGS */ | |
1591 | nla_total_size(2) + | |
1592 | /* IFLA_GRE_IKEY */ | |
1593 | nla_total_size(4) + | |
1594 | /* IFLA_GRE_OKEY */ | |
1595 | nla_total_size(4) + | |
1596 | /* IFLA_GRE_LOCAL */ | |
1597 | nla_total_size(4) + | |
1598 | /* IFLA_GRE_REMOTE */ | |
1599 | nla_total_size(4) + | |
1600 | /* IFLA_GRE_TTL */ | |
1601 | nla_total_size(1) + | |
1602 | /* IFLA_GRE_TOS */ | |
1603 | nla_total_size(1) + | |
1604 | /* IFLA_GRE_PMTUDISC */ | |
1605 | nla_total_size(1) + | |
1606 | 0; | |
1607 | } | |
1608 | ||
1609 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1610 | { | |
1611 | struct ip_tunnel *t = netdev_priv(dev); | |
1612 | struct ip_tunnel_parm *p = &t->parms; | |
1613 | ||
1614 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1615 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1616 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
ba9e64b1 PM |
1617 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
1618 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); | |
4d74f8ba PM |
1619 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
1620 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); | |
c19e654d HX |
1621 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
1622 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1623 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1624 | ||
1625 | return 0; | |
1626 | ||
1627 | nla_put_failure: | |
1628 | return -EMSGSIZE; | |
1629 | } | |
1630 | ||
1631 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1632 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1633 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1634 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1635 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1636 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1637 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1638 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1639 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1640 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1641 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1642 | }; | |
1643 | ||
1644 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1645 | .kind = "gre", | |
1646 | .maxtype = IFLA_GRE_MAX, | |
1647 | .policy = ipgre_policy, | |
1648 | .priv_size = sizeof(struct ip_tunnel), | |
1649 | .setup = ipgre_tunnel_setup, | |
1650 | .validate = ipgre_tunnel_validate, | |
1651 | .newlink = ipgre_newlink, | |
1652 | .changelink = ipgre_changelink, | |
1653 | .get_size = ipgre_get_size, | |
1654 | .fill_info = ipgre_fill_info, | |
1655 | }; | |
1656 | ||
e1a80002 HX |
1657 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1658 | .kind = "gretap", | |
1659 | .maxtype = IFLA_GRE_MAX, | |
1660 | .policy = ipgre_policy, | |
1661 | .priv_size = sizeof(struct ip_tunnel), | |
1662 | .setup = ipgre_tap_setup, | |
1663 | .validate = ipgre_tap_validate, | |
1664 | .newlink = ipgre_newlink, | |
1665 | .changelink = ipgre_changelink, | |
1666 | .get_size = ipgre_get_size, | |
1667 | .fill_info = ipgre_fill_info, | |
1668 | }; | |
1669 | ||
1da177e4 LT |
1670 | /* |
1671 | * And now the modules code and kernel interface. | |
1672 | */ | |
1673 | ||
1674 | static int __init ipgre_init(void) | |
1675 | { | |
1676 | int err; | |
1677 | ||
1678 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1679 | ||
1680 | if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) { | |
1681 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1682 | return -EAGAIN; | |
1683 | } | |
1684 | ||
59a4c759 PE |
1685 | err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops); |
1686 | if (err < 0) | |
c19e654d | 1687 | goto gen_device_failed; |
7daa0004 | 1688 | |
c19e654d HX |
1689 | err = rtnl_link_register(&ipgre_link_ops); |
1690 | if (err < 0) | |
1691 | goto rtnl_link_failed; | |
1692 | ||
e1a80002 HX |
1693 | err = rtnl_link_register(&ipgre_tap_ops); |
1694 | if (err < 0) | |
1695 | goto tap_ops_failed; | |
1696 | ||
c19e654d | 1697 | out: |
1da177e4 | 1698 | return err; |
c19e654d | 1699 | |
e1a80002 HX |
1700 | tap_ops_failed: |
1701 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d HX |
1702 | rtnl_link_failed: |
1703 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1704 | gen_device_failed: | |
1705 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); | |
1706 | goto out; | |
1da177e4 LT |
1707 | } |
1708 | ||
db44575f | 1709 | static void __exit ipgre_fini(void) |
1da177e4 | 1710 | { |
e1a80002 | 1711 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d HX |
1712 | rtnl_link_unregister(&ipgre_link_ops); |
1713 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1da177e4 LT |
1714 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
1715 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); | |
1da177e4 LT |
1716 | } |
1717 | ||
1718 | module_init(ipgre_init); | |
1719 | module_exit(ipgre_fini); | |
1720 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1721 | MODULE_ALIAS_RTNL_LINK("gre"); |
1722 | MODULE_ALIAS_RTNL_LINK("gretap"); |