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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 | ||
e905a9ed | 69 | Current solution: t->recursion lock breaks dead loops. It looks |
1da177e4 LT |
70 | like dev->tbusy flag, but I preferred new variable, because |
71 | the semantics is different. One day, when hard_start_xmit | |
72 | will be multithreaded we will have to use skb->encapsulation. | |
73 | ||
74 | ||
75 | ||
76 | 2. Networking dead loops would not kill routers, but would really | |
77 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
78 | if we copy it from packet being encapsulated to upper header. | |
79 | It is very good solution, but it introduces two problems: | |
80 | ||
81 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
82 | do not work over tunnels. | |
83 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
84 | so that this problem would be solved and traceroute output | |
85 | would even more informative. This idea appeared to be wrong: | |
86 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
87 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
88 | return only 8 bytes of payload. It is the end. | |
89 | ||
90 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
91 | we should search for another solution. | |
92 | ||
93 | One of them is to parse packet trying to detect inner encapsulation | |
94 | made by our node. It is difficult or even impossible, especially, | |
95 | taking into account fragmentation. TO be short, tt is not solution at all. | |
96 | ||
97 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
98 | We force DF flag on tunnels with preconfigured hop limit, | |
99 | that is ALL. :-) Well, it does not remove the problem completely, | |
100 | but exponential growth of network traffic is changed to linear | |
101 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
102 | fastly degrades to value <68, where looping stops. | |
103 | Yes, it is not good if there exists a router in the loop, | |
104 | which does not force DF, even when encapsulating packets have DF set. | |
105 | But it is not our problem! Nobody could accuse us, we made | |
106 | all that we could make. Even if it is your gated who injected | |
107 | fatal route to network, even if it were you who configured | |
108 | fatal static route: you are innocent. :-) | |
109 | ||
110 | ||
111 | ||
112 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain | |
113 | practically identical code. It would be good to glue them | |
114 | together, but it is not very evident, how to make them modular. | |
115 | sit is integral part of IPv6, ipip and gre are naturally modular. | |
116 | We could extract common parts (hash table, ioctl etc) | |
117 | to a separate module (ip_tunnel.c). | |
118 | ||
119 | Alexey Kuznetsov. | |
120 | */ | |
121 | ||
c19e654d | 122 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 LT |
123 | static int ipgre_tunnel_init(struct net_device *dev); |
124 | static void ipgre_tunnel_setup(struct net_device *dev); | |
42aa9162 | 125 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
1da177e4 LT |
126 | |
127 | /* Fallback tunnel: no source, no destination, no key, no options */ | |
128 | ||
eb8ce741 PE |
129 | #define HASH_SIZE 16 |
130 | ||
59a4c759 PE |
131 | static int ipgre_net_id; |
132 | struct ipgre_net { | |
eb8ce741 PE |
133 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
134 | ||
7daa0004 | 135 | struct net_device *fb_tunnel_dev; |
59a4c759 PE |
136 | }; |
137 | ||
1da177e4 LT |
138 | /* Tunnel hash table */ |
139 | ||
140 | /* | |
141 | 4 hash tables: | |
142 | ||
143 | 3: (remote,local) | |
144 | 2: (remote,*) | |
145 | 1: (*,local) | |
146 | 0: (*,*) | |
147 | ||
148 | We require exact key match i.e. if a key is present in packet | |
149 | it will match only tunnel with the same key; if it is not present, | |
150 | it will match only keyless tunnel. | |
151 | ||
152 | All keysless packets, if not matched configured keyless tunnels | |
153 | will match fallback tunnel. | |
154 | */ | |
155 | ||
d5a0a1e3 | 156 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 157 | |
eb8ce741 PE |
158 | #define tunnels_r_l tunnels[3] |
159 | #define tunnels_r tunnels[2] | |
160 | #define tunnels_l tunnels[1] | |
161 | #define tunnels_wc tunnels[0] | |
1da177e4 LT |
162 | |
163 | static DEFINE_RWLOCK(ipgre_lock); | |
164 | ||
165 | /* Given src, dst and key, find appropriate for input tunnel. */ | |
166 | ||
749c10f9 | 167 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev, |
e1a80002 HX |
168 | __be32 remote, __be32 local, |
169 | __be32 key, __be16 gre_proto) | |
1da177e4 | 170 | { |
749c10f9 TT |
171 | struct net *net = dev_net(dev); |
172 | int link = dev->ifindex; | |
1da177e4 LT |
173 | unsigned h0 = HASH(remote); |
174 | unsigned h1 = HASH(key); | |
749c10f9 | 175 | struct ip_tunnel *t, *sel[4] = { NULL, NULL, NULL, NULL }; |
7daa0004 | 176 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
177 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
178 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
749c10f9 | 179 | int idx; |
1da177e4 | 180 | |
eb8ce741 | 181 | for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) { |
749c10f9 TT |
182 | if (local != t->parms.iph.saddr || |
183 | remote != t->parms.iph.daddr || | |
184 | key != t->parms.i_key || | |
185 | !(t->dev->flags & IFF_UP)) | |
186 | continue; | |
187 | ||
188 | if (t->dev->type != ARPHRD_IPGRE && | |
189 | t->dev->type != dev_type) | |
190 | continue; | |
191 | ||
192 | idx = 0; | |
193 | if (t->parms.link != link) | |
194 | idx |= 1; | |
195 | if (t->dev->type != dev_type) | |
196 | idx |= 2; | |
197 | if (idx == 0) | |
198 | return t; | |
199 | if (sel[idx] == NULL) | |
200 | sel[idx] = t; | |
1da177e4 | 201 | } |
e1a80002 | 202 | |
eb8ce741 | 203 | for (t = ign->tunnels_r[h0^h1]; t; t = t->next) { |
749c10f9 TT |
204 | if (remote != t->parms.iph.daddr || |
205 | key != t->parms.i_key || | |
206 | !(t->dev->flags & IFF_UP)) | |
207 | continue; | |
208 | ||
209 | if (t->dev->type != ARPHRD_IPGRE && | |
210 | t->dev->type != dev_type) | |
211 | continue; | |
212 | ||
213 | idx = 0; | |
214 | if (t->parms.link != link) | |
215 | idx |= 1; | |
216 | if (t->dev->type != dev_type) | |
217 | idx |= 2; | |
218 | if (idx == 0) | |
219 | return t; | |
220 | if (sel[idx] == NULL) | |
221 | sel[idx] = t; | |
1da177e4 | 222 | } |
e1a80002 | 223 | |
eb8ce741 | 224 | for (t = ign->tunnels_l[h1]; t; t = t->next) { |
749c10f9 TT |
225 | if ((local != t->parms.iph.saddr && |
226 | (local != t->parms.iph.daddr || | |
227 | !ipv4_is_multicast(local))) || | |
228 | key != t->parms.i_key || | |
229 | !(t->dev->flags & IFF_UP)) | |
230 | continue; | |
231 | ||
232 | if (t->dev->type != ARPHRD_IPGRE && | |
233 | t->dev->type != dev_type) | |
234 | continue; | |
235 | ||
236 | idx = 0; | |
237 | if (t->parms.link != link) | |
238 | idx |= 1; | |
239 | if (t->dev->type != dev_type) | |
240 | idx |= 2; | |
241 | if (idx == 0) | |
242 | return t; | |
243 | if (sel[idx] == NULL) | |
244 | sel[idx] = t; | |
1da177e4 | 245 | } |
e1a80002 | 246 | |
eb8ce741 | 247 | for (t = ign->tunnels_wc[h1]; t; t = t->next) { |
749c10f9 TT |
248 | if (t->parms.i_key != key || |
249 | !(t->dev->flags & IFF_UP)) | |
250 | continue; | |
251 | ||
252 | if (t->dev->type != ARPHRD_IPGRE && | |
253 | t->dev->type != dev_type) | |
254 | continue; | |
255 | ||
256 | idx = 0; | |
257 | if (t->parms.link != link) | |
258 | idx |= 1; | |
259 | if (t->dev->type != dev_type) | |
260 | idx |= 2; | |
261 | if (idx == 0) | |
262 | return t; | |
263 | if (sel[idx] == NULL) | |
264 | sel[idx] = t; | |
1da177e4 LT |
265 | } |
266 | ||
749c10f9 TT |
267 | for (idx = 1; idx < ARRAY_SIZE(sel); idx++) |
268 | if (sel[idx] != NULL) | |
269 | return sel[idx]; | |
e1a80002 | 270 | |
749c10f9 | 271 | if (ign->fb_tunnel_dev->flags & IFF_UP) |
7daa0004 | 272 | return netdev_priv(ign->fb_tunnel_dev); |
749c10f9 | 273 | |
1da177e4 LT |
274 | return NULL; |
275 | } | |
276 | ||
f57e7d5a PE |
277 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
278 | struct ip_tunnel_parm *parms) | |
1da177e4 | 279 | { |
5056a1ef YH |
280 | __be32 remote = parms->iph.daddr; |
281 | __be32 local = parms->iph.saddr; | |
282 | __be32 key = parms->i_key; | |
1da177e4 LT |
283 | unsigned h = HASH(key); |
284 | int prio = 0; | |
285 | ||
286 | if (local) | |
287 | prio |= 1; | |
f97c1e0c | 288 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
289 | prio |= 2; |
290 | h ^= HASH(remote); | |
291 | } | |
292 | ||
eb8ce741 | 293 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
294 | } |
295 | ||
f57e7d5a PE |
296 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
297 | struct ip_tunnel *t) | |
5056a1ef | 298 | { |
f57e7d5a | 299 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
300 | } |
301 | ||
f57e7d5a | 302 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 303 | { |
f57e7d5a | 304 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
1da177e4 LT |
305 | |
306 | t->next = *tp; | |
307 | write_lock_bh(&ipgre_lock); | |
308 | *tp = t; | |
309 | write_unlock_bh(&ipgre_lock); | |
310 | } | |
311 | ||
f57e7d5a | 312 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 LT |
313 | { |
314 | struct ip_tunnel **tp; | |
315 | ||
f57e7d5a | 316 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
317 | if (t == *tp) { |
318 | write_lock_bh(&ipgre_lock); | |
319 | *tp = t->next; | |
320 | write_unlock_bh(&ipgre_lock); | |
321 | break; | |
322 | } | |
323 | } | |
324 | } | |
325 | ||
e1a80002 HX |
326 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
327 | struct ip_tunnel_parm *parms, | |
328 | int type) | |
1da177e4 | 329 | { |
d5a0a1e3 AV |
330 | __be32 remote = parms->iph.daddr; |
331 | __be32 local = parms->iph.saddr; | |
332 | __be32 key = parms->i_key; | |
749c10f9 | 333 | int link = parms->link; |
e1a80002 HX |
334 | struct ip_tunnel *t, **tp; |
335 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
336 | ||
337 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) | |
338 | if (local == t->parms.iph.saddr && | |
339 | remote == t->parms.iph.daddr && | |
340 | key == t->parms.i_key && | |
749c10f9 | 341 | link == t->parms.link && |
e1a80002 HX |
342 | type == t->dev->type) |
343 | break; | |
344 | ||
345 | return t; | |
346 | } | |
347 | ||
348 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, | |
349 | struct ip_tunnel_parm *parms, int create) | |
350 | { | |
351 | struct ip_tunnel *t, *nt; | |
1da177e4 | 352 | struct net_device *dev; |
1da177e4 | 353 | char name[IFNAMSIZ]; |
f57e7d5a | 354 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 355 | |
e1a80002 HX |
356 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
357 | if (t || !create) | |
358 | return t; | |
1da177e4 LT |
359 | |
360 | if (parms->name[0]) | |
361 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
362 | else |
363 | sprintf(name, "gre%%d"); | |
1da177e4 LT |
364 | |
365 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
366 | if (!dev) | |
367 | return NULL; | |
368 | ||
0b67eceb PE |
369 | dev_net_set(dev, net); |
370 | ||
b37d428b PE |
371 | if (strchr(name, '%')) { |
372 | if (dev_alloc_name(dev, name) < 0) | |
373 | goto failed_free; | |
374 | } | |
375 | ||
2941a486 | 376 | nt = netdev_priv(dev); |
1da177e4 | 377 | nt->parms = *parms; |
c19e654d | 378 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 379 | |
42aa9162 HX |
380 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
381 | ||
b37d428b PE |
382 | if (register_netdevice(dev) < 0) |
383 | goto failed_free; | |
1da177e4 | 384 | |
1da177e4 | 385 | dev_hold(dev); |
f57e7d5a | 386 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
387 | return nt; |
388 | ||
b37d428b PE |
389 | failed_free: |
390 | free_netdev(dev); | |
1da177e4 LT |
391 | return NULL; |
392 | } | |
393 | ||
394 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
395 | { | |
f57e7d5a PE |
396 | struct net *net = dev_net(dev); |
397 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
398 | ||
399 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
400 | dev_put(dev); |
401 | } | |
402 | ||
403 | ||
404 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
405 | { | |
1da177e4 | 406 | |
071f92d0 | 407 | /* All the routers (except for Linux) return only |
1da177e4 LT |
408 | 8 bytes of packet payload. It means, that precise relaying of |
409 | ICMP in the real Internet is absolutely infeasible. | |
410 | ||
411 | Moreover, Cisco "wise men" put GRE key to the third word | |
412 | in GRE header. It makes impossible maintaining even soft state for keyed | |
413 | GRE tunnels with enabled checksum. Tell them "thank you". | |
414 | ||
415 | Well, I wonder, rfc1812 was written by Cisco employee, | |
416 | what the hell these idiots break standrads established | |
417 | by themself??? | |
418 | */ | |
419 | ||
6ed2533e | 420 | struct iphdr *iph = (struct iphdr *)skb->data; |
d5a0a1e3 | 421 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 422 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
423 | const int type = icmp_hdr(skb)->type; |
424 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 425 | struct ip_tunnel *t; |
d5a0a1e3 | 426 | __be16 flags; |
1da177e4 LT |
427 | |
428 | flags = p[0]; | |
429 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
430 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
431 | return; | |
432 | if (flags&GRE_KEY) { | |
433 | grehlen += 4; | |
434 | if (flags&GRE_CSUM) | |
435 | grehlen += 4; | |
436 | } | |
437 | } | |
438 | ||
439 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
440 | if (skb_headlen(skb) < grehlen) | |
441 | return; | |
442 | ||
443 | switch (type) { | |
444 | default: | |
445 | case ICMP_PARAMETERPROB: | |
446 | return; | |
447 | ||
448 | case ICMP_DEST_UNREACH: | |
449 | switch (code) { | |
450 | case ICMP_SR_FAILED: | |
451 | case ICMP_PORT_UNREACH: | |
452 | /* Impossible event. */ | |
453 | return; | |
454 | case ICMP_FRAG_NEEDED: | |
455 | /* Soft state for pmtu is maintained by IP core. */ | |
456 | return; | |
457 | default: | |
458 | /* All others are translated to HOST_UNREACH. | |
459 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
460 | I believe they are just ether pollution. --ANK | |
461 | */ | |
462 | break; | |
463 | } | |
464 | break; | |
465 | case ICMP_TIME_EXCEEDED: | |
466 | if (code != ICMP_EXC_TTL) | |
467 | return; | |
468 | break; | |
469 | } | |
470 | ||
471 | read_lock(&ipgre_lock); | |
749c10f9 | 472 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
473 | flags & GRE_KEY ? |
474 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
475 | p[1]); | |
f97c1e0c JP |
476 | if (t == NULL || t->parms.iph.daddr == 0 || |
477 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
478 | goto out; |
479 | ||
480 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
481 | goto out; | |
482 | ||
483 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
484 | t->err_count++; | |
485 | else | |
486 | t->err_count = 1; | |
487 | t->err_time = jiffies; | |
488 | out: | |
489 | read_unlock(&ipgre_lock); | |
490 | return; | |
1da177e4 LT |
491 | } |
492 | ||
493 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
494 | { | |
495 | if (INET_ECN_is_ce(iph->tos)) { | |
496 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 497 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 498 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 499 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
500 | } |
501 | } | |
502 | } | |
503 | ||
504 | static inline u8 | |
505 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) | |
506 | { | |
507 | u8 inner = 0; | |
508 | if (skb->protocol == htons(ETH_P_IP)) | |
509 | inner = old_iph->tos; | |
510 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
511 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); | |
512 | return INET_ECN_encapsulate(tos, inner); | |
513 | } | |
514 | ||
515 | static int ipgre_rcv(struct sk_buff *skb) | |
516 | { | |
517 | struct iphdr *iph; | |
518 | u8 *h; | |
d5a0a1e3 | 519 | __be16 flags; |
d3bc23e7 | 520 | __sum16 csum = 0; |
d5a0a1e3 | 521 | __be32 key = 0; |
1da177e4 LT |
522 | u32 seqno = 0; |
523 | struct ip_tunnel *tunnel; | |
524 | int offset = 4; | |
e1a80002 | 525 | __be16 gre_proto; |
64194c31 | 526 | unsigned int len; |
1da177e4 LT |
527 | |
528 | if (!pskb_may_pull(skb, 16)) | |
529 | goto drop_nolock; | |
530 | ||
eddc9ec5 | 531 | iph = ip_hdr(skb); |
1da177e4 | 532 | h = skb->data; |
d5a0a1e3 | 533 | flags = *(__be16*)h; |
1da177e4 LT |
534 | |
535 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
536 | /* - Version must be 0. | |
537 | - We do not support routing headers. | |
538 | */ | |
539 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
540 | goto drop_nolock; | |
541 | ||
542 | if (flags&GRE_CSUM) { | |
fb286bb2 | 543 | switch (skb->ip_summed) { |
84fa7933 | 544 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 545 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
546 | if (!csum) |
547 | break; | |
548 | /* fall through */ | |
549 | case CHECKSUM_NONE: | |
550 | skb->csum = 0; | |
551 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 552 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
553 | } |
554 | offset += 4; | |
555 | } | |
556 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 557 | key = *(__be32*)(h + offset); |
1da177e4 LT |
558 | offset += 4; |
559 | } | |
560 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 561 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
562 | offset += 4; |
563 | } | |
564 | } | |
565 | ||
e1a80002 HX |
566 | gre_proto = *(__be16 *)(h + 2); |
567 | ||
1da177e4 | 568 | read_lock(&ipgre_lock); |
749c10f9 | 569 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
570 | iph->saddr, iph->daddr, key, |
571 | gre_proto))) { | |
addd68eb PE |
572 | struct net_device_stats *stats = &tunnel->dev->stats; |
573 | ||
1da177e4 LT |
574 | secpath_reset(skb); |
575 | ||
e1a80002 | 576 | skb->protocol = gre_proto; |
1da177e4 LT |
577 | /* WCCP version 1 and 2 protocol decoding. |
578 | * - Change protocol to IP | |
579 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
580 | */ | |
e1a80002 | 581 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 582 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 583 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
584 | offset += 4; |
585 | } | |
586 | ||
1d069167 | 587 | skb->mac_header = skb->network_header; |
4209fb60 | 588 | __pskb_pull(skb, offset); |
9c70220b | 589 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
590 | skb->pkt_type = PACKET_HOST; |
591 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 592 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 593 | /* Looped back packet, drop it! */ |
ee6b9673 | 594 | if (skb->rtable->fl.iif == 0) |
1da177e4 | 595 | goto drop; |
addd68eb | 596 | stats->multicast++; |
1da177e4 LT |
597 | skb->pkt_type = PACKET_BROADCAST; |
598 | } | |
599 | #endif | |
600 | ||
601 | if (((flags&GRE_CSUM) && csum) || | |
602 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
addd68eb PE |
603 | stats->rx_crc_errors++; |
604 | stats->rx_errors++; | |
1da177e4 LT |
605 | goto drop; |
606 | } | |
607 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
608 | if (!(flags&GRE_SEQ) || | |
609 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
addd68eb PE |
610 | stats->rx_fifo_errors++; |
611 | stats->rx_errors++; | |
1da177e4 LT |
612 | goto drop; |
613 | } | |
614 | tunnel->i_seqno = seqno + 1; | |
615 | } | |
e1a80002 | 616 | |
64194c31 HX |
617 | len = skb->len; |
618 | ||
e1a80002 HX |
619 | /* Warning: All skb pointers will be invalidated! */ |
620 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
621 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
622 | stats->rx_length_errors++; | |
623 | stats->rx_errors++; | |
624 | goto drop; | |
625 | } | |
626 | ||
627 | iph = ip_hdr(skb); | |
628 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
629 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
630 | } | |
631 | ||
addd68eb | 632 | stats->rx_packets++; |
64194c31 | 633 | stats->rx_bytes += len; |
1da177e4 LT |
634 | skb->dev = tunnel->dev; |
635 | dst_release(skb->dst); | |
636 | skb->dst = NULL; | |
637 | nf_reset(skb); | |
e1a80002 HX |
638 | |
639 | skb_reset_network_header(skb); | |
1da177e4 | 640 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 641 | |
1da177e4 LT |
642 | netif_rx(skb); |
643 | read_unlock(&ipgre_lock); | |
644 | return(0); | |
645 | } | |
45af08be | 646 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
647 | |
648 | drop: | |
649 | read_unlock(&ipgre_lock); | |
650 | drop_nolock: | |
651 | kfree_skb(skb); | |
652 | return(0); | |
653 | } | |
654 | ||
655 | static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
656 | { | |
2941a486 | 657 | struct ip_tunnel *tunnel = netdev_priv(dev); |
addd68eb | 658 | struct net_device_stats *stats = &tunnel->dev->stats; |
eddc9ec5 | 659 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 LT |
660 | struct iphdr *tiph; |
661 | u8 tos; | |
d5a0a1e3 | 662 | __be16 df; |
1da177e4 LT |
663 | struct rtable *rt; /* Route to the other host */ |
664 | struct net_device *tdev; /* Device to other host */ | |
665 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 666 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 667 | int gre_hlen; |
d5a0a1e3 | 668 | __be32 dst; |
1da177e4 LT |
669 | int mtu; |
670 | ||
671 | if (tunnel->recursion++) { | |
addd68eb | 672 | stats->collisions++; |
1da177e4 LT |
673 | goto tx_error; |
674 | } | |
675 | ||
e1a80002 HX |
676 | if (dev->type == ARPHRD_ETHER) |
677 | IPCB(skb)->flags = 0; | |
678 | ||
679 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 680 | gre_hlen = 0; |
6ed2533e | 681 | tiph = (struct iphdr *)skb->data; |
1da177e4 LT |
682 | } else { |
683 | gre_hlen = tunnel->hlen; | |
684 | tiph = &tunnel->parms.iph; | |
685 | } | |
686 | ||
687 | if ((dst = tiph->daddr) == 0) { | |
688 | /* NBMA tunnel */ | |
689 | ||
690 | if (skb->dst == NULL) { | |
addd68eb | 691 | stats->tx_fifo_errors++; |
1da177e4 LT |
692 | goto tx_error; |
693 | } | |
694 | ||
695 | if (skb->protocol == htons(ETH_P_IP)) { | |
ee6b9673 | 696 | rt = skb->rtable; |
1da177e4 LT |
697 | if ((dst = rt->rt_gateway) == 0) |
698 | goto tx_error_icmp; | |
699 | } | |
700 | #ifdef CONFIG_IPV6 | |
701 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
702 | struct in6_addr *addr6; | |
703 | int addr_type; | |
704 | struct neighbour *neigh = skb->dst->neighbour; | |
705 | ||
706 | if (neigh == NULL) | |
707 | goto tx_error; | |
708 | ||
6ed2533e | 709 | addr6 = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
710 | addr_type = ipv6_addr_type(addr6); |
711 | ||
712 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 713 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
714 | addr_type = ipv6_addr_type(addr6); |
715 | } | |
716 | ||
717 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
718 | goto tx_error_icmp; | |
719 | ||
720 | dst = addr6->s6_addr32[3]; | |
721 | } | |
722 | #endif | |
723 | else | |
724 | goto tx_error; | |
725 | } | |
726 | ||
727 | tos = tiph->tos; | |
728 | if (tos&1) { | |
729 | if (skb->protocol == htons(ETH_P_IP)) | |
730 | tos = old_iph->tos; | |
731 | tos &= ~1; | |
732 | } | |
733 | ||
734 | { | |
735 | struct flowi fl = { .oif = tunnel->parms.link, | |
736 | .nl_u = { .ip4_u = | |
737 | { .daddr = dst, | |
738 | .saddr = tiph->saddr, | |
739 | .tos = RT_TOS(tos) } }, | |
740 | .proto = IPPROTO_GRE }; | |
96635522 | 741 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
addd68eb | 742 | stats->tx_carrier_errors++; |
1da177e4 LT |
743 | goto tx_error; |
744 | } | |
745 | } | |
746 | tdev = rt->u.dst.dev; | |
747 | ||
748 | if (tdev == dev) { | |
749 | ip_rt_put(rt); | |
addd68eb | 750 | stats->collisions++; |
1da177e4 LT |
751 | goto tx_error; |
752 | } | |
753 | ||
754 | df = tiph->frag_off; | |
755 | if (df) | |
c95b819a | 756 | mtu = dst_mtu(&rt->u.dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 LT |
757 | else |
758 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
759 | ||
760 | if (skb->dst) | |
761 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
762 | ||
763 | if (skb->protocol == htons(ETH_P_IP)) { | |
764 | df |= (old_iph->frag_off&htons(IP_DF)); | |
765 | ||
766 | if ((old_iph->frag_off&htons(IP_DF)) && | |
767 | mtu < ntohs(old_iph->tot_len)) { | |
768 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
769 | ip_rt_put(rt); | |
770 | goto tx_error; | |
771 | } | |
772 | } | |
773 | #ifdef CONFIG_IPV6 | |
774 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
6ed2533e | 775 | struct rt6_info *rt6 = (struct rt6_info *)skb->dst; |
1da177e4 LT |
776 | |
777 | if (rt6 && mtu < dst_mtu(skb->dst) && mtu >= IPV6_MIN_MTU) { | |
f97c1e0c JP |
778 | if ((tunnel->parms.iph.daddr && |
779 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
780 | rt6->rt6i_dst.plen == 128) { |
781 | rt6->rt6i_flags |= RTF_MODIFIED; | |
782 | skb->dst->metrics[RTAX_MTU-1] = mtu; | |
783 | } | |
784 | } | |
785 | ||
786 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
787 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
788 | ip_rt_put(rt); | |
789 | goto tx_error; | |
790 | } | |
791 | } | |
792 | #endif | |
793 | ||
794 | if (tunnel->err_count > 0) { | |
795 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
796 | tunnel->err_count--; | |
797 | ||
798 | dst_link_failure(skb); | |
799 | } else | |
800 | tunnel->err_count = 0; | |
801 | } | |
802 | ||
803 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; | |
804 | ||
cfbba49d PM |
805 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
806 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
807 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
808 | if (!new_skb) { | |
809 | ip_rt_put(rt); | |
e905a9ed | 810 | stats->tx_dropped++; |
1da177e4 LT |
811 | dev_kfree_skb(skb); |
812 | tunnel->recursion--; | |
813 | return 0; | |
814 | } | |
815 | if (skb->sk) | |
816 | skb_set_owner_w(new_skb, skb->sk); | |
817 | dev_kfree_skb(skb); | |
818 | skb = new_skb; | |
eddc9ec5 | 819 | old_iph = ip_hdr(skb); |
1da177e4 LT |
820 | } |
821 | ||
64194c31 | 822 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
823 | skb_push(skb, gre_hlen); |
824 | skb_reset_network_header(skb); | |
1da177e4 | 825 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
826 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
827 | IPSKB_REROUTED); | |
1da177e4 LT |
828 | dst_release(skb->dst); |
829 | skb->dst = &rt->u.dst; | |
830 | ||
831 | /* | |
832 | * Push down and install the IPIP header. | |
833 | */ | |
834 | ||
eddc9ec5 | 835 | iph = ip_hdr(skb); |
1da177e4 LT |
836 | iph->version = 4; |
837 | iph->ihl = sizeof(struct iphdr) >> 2; | |
838 | iph->frag_off = df; | |
839 | iph->protocol = IPPROTO_GRE; | |
840 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
841 | iph->daddr = rt->rt_dst; | |
842 | iph->saddr = rt->rt_src; | |
843 | ||
844 | if ((iph->ttl = tiph->ttl) == 0) { | |
845 | if (skb->protocol == htons(ETH_P_IP)) | |
846 | iph->ttl = old_iph->ttl; | |
847 | #ifdef CONFIG_IPV6 | |
848 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
6ed2533e | 849 | iph->ttl = ((struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
850 | #endif |
851 | else | |
852 | iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); | |
853 | } | |
854 | ||
e1a80002 HX |
855 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
856 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
857 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
858 | |
859 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 860 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
861 | |
862 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
863 | ++tunnel->o_seqno; | |
864 | *ptr = htonl(tunnel->o_seqno); | |
865 | ptr--; | |
866 | } | |
867 | if (tunnel->parms.o_flags&GRE_KEY) { | |
868 | *ptr = tunnel->parms.o_key; | |
869 | ptr--; | |
870 | } | |
871 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
872 | *ptr = 0; | |
5f92a738 | 873 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
874 | } |
875 | } | |
876 | ||
877 | nf_reset(skb); | |
878 | ||
879 | IPTUNNEL_XMIT(); | |
880 | tunnel->recursion--; | |
881 | return 0; | |
882 | ||
883 | tx_error_icmp: | |
884 | dst_link_failure(skb); | |
885 | ||
886 | tx_error: | |
887 | stats->tx_errors++; | |
888 | dev_kfree_skb(skb); | |
889 | tunnel->recursion--; | |
890 | return 0; | |
891 | } | |
892 | ||
42aa9162 | 893 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
894 | { |
895 | struct net_device *tdev = NULL; | |
896 | struct ip_tunnel *tunnel; | |
897 | struct iphdr *iph; | |
898 | int hlen = LL_MAX_HEADER; | |
899 | int mtu = ETH_DATA_LEN; | |
900 | int addend = sizeof(struct iphdr) + 4; | |
901 | ||
902 | tunnel = netdev_priv(dev); | |
903 | iph = &tunnel->parms.iph; | |
904 | ||
c95b819a | 905 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
906 | |
907 | if (iph->daddr) { | |
908 | struct flowi fl = { .oif = tunnel->parms.link, | |
909 | .nl_u = { .ip4_u = | |
910 | { .daddr = iph->daddr, | |
911 | .saddr = iph->saddr, | |
912 | .tos = RT_TOS(iph->tos) } }, | |
913 | .proto = IPPROTO_GRE }; | |
914 | struct rtable *rt; | |
96635522 | 915 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
ee34c1eb MS |
916 | tdev = rt->u.dst.dev; |
917 | ip_rt_put(rt); | |
918 | } | |
e1a80002 HX |
919 | |
920 | if (dev->type != ARPHRD_ETHER) | |
921 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
922 | } |
923 | ||
924 | if (!tdev && tunnel->parms.link) | |
96635522 | 925 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
926 | |
927 | if (tdev) { | |
c95b819a | 928 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
929 | mtu = tdev->mtu; |
930 | } | |
931 | dev->iflink = tunnel->parms.link; | |
932 | ||
933 | /* Precalculate GRE options length */ | |
934 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
935 | if (tunnel->parms.o_flags&GRE_CSUM) | |
936 | addend += 4; | |
937 | if (tunnel->parms.o_flags&GRE_KEY) | |
938 | addend += 4; | |
939 | if (tunnel->parms.o_flags&GRE_SEQ) | |
940 | addend += 4; | |
941 | } | |
c95b819a | 942 | dev->needed_headroom = addend + hlen; |
42aa9162 HX |
943 | mtu -= dev->hard_header_len - addend; |
944 | ||
945 | if (mtu < 68) | |
946 | mtu = 68; | |
947 | ||
ee34c1eb MS |
948 | tunnel->hlen = addend; |
949 | ||
42aa9162 | 950 | return mtu; |
ee34c1eb MS |
951 | } |
952 | ||
1da177e4 LT |
953 | static int |
954 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
955 | { | |
956 | int err = 0; | |
957 | struct ip_tunnel_parm p; | |
958 | struct ip_tunnel *t; | |
f57e7d5a PE |
959 | struct net *net = dev_net(dev); |
960 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
961 | |
962 | switch (cmd) { | |
963 | case SIOCGETTUNNEL: | |
964 | t = NULL; | |
7daa0004 | 965 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
966 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
967 | err = -EFAULT; | |
968 | break; | |
969 | } | |
f57e7d5a | 970 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
971 | } |
972 | if (t == NULL) | |
2941a486 | 973 | t = netdev_priv(dev); |
1da177e4 LT |
974 | memcpy(&p, &t->parms, sizeof(p)); |
975 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
976 | err = -EFAULT; | |
977 | break; | |
978 | ||
979 | case SIOCADDTUNNEL: | |
980 | case SIOCCHGTUNNEL: | |
981 | err = -EPERM; | |
982 | if (!capable(CAP_NET_ADMIN)) | |
983 | goto done; | |
984 | ||
985 | err = -EFAULT; | |
986 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
987 | goto done; | |
988 | ||
989 | err = -EINVAL; | |
990 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
991 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
992 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
993 | goto done; | |
994 | if (p.iph.ttl) | |
995 | p.iph.frag_off |= htons(IP_DF); | |
996 | ||
997 | if (!(p.i_flags&GRE_KEY)) | |
998 | p.i_key = 0; | |
999 | if (!(p.o_flags&GRE_KEY)) | |
1000 | p.o_key = 0; | |
1001 | ||
f57e7d5a | 1002 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1003 | |
7daa0004 | 1004 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1005 | if (t != NULL) { |
1006 | if (t->dev != dev) { | |
1007 | err = -EEXIST; | |
1008 | break; | |
1009 | } | |
1010 | } else { | |
6ed2533e | 1011 | unsigned nflags = 0; |
1da177e4 | 1012 | |
2941a486 | 1013 | t = netdev_priv(dev); |
1da177e4 | 1014 | |
f97c1e0c | 1015 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1016 | nflags = IFF_BROADCAST; |
1017 | else if (p.iph.daddr) | |
1018 | nflags = IFF_POINTOPOINT; | |
1019 | ||
1020 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1021 | err = -EINVAL; | |
1022 | break; | |
1023 | } | |
f57e7d5a | 1024 | ipgre_tunnel_unlink(ign, t); |
1da177e4 LT |
1025 | t->parms.iph.saddr = p.iph.saddr; |
1026 | t->parms.iph.daddr = p.iph.daddr; | |
1027 | t->parms.i_key = p.i_key; | |
1028 | t->parms.o_key = p.o_key; | |
1029 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1030 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1031 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1032 | netdev_state_change(dev); |
1033 | } | |
1034 | } | |
1035 | ||
1036 | if (t) { | |
1037 | err = 0; | |
1038 | if (cmd == SIOCCHGTUNNEL) { | |
1039 | t->parms.iph.ttl = p.iph.ttl; | |
1040 | t->parms.iph.tos = p.iph.tos; | |
1041 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1042 | if (t->parms.link != p.link) { |
1043 | t->parms.link = p.link; | |
42aa9162 | 1044 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1045 | netdev_state_change(dev); |
1046 | } | |
1da177e4 LT |
1047 | } |
1048 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1049 | err = -EFAULT; | |
1050 | } else | |
1051 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1052 | break; | |
1053 | ||
1054 | case SIOCDELTUNNEL: | |
1055 | err = -EPERM; | |
1056 | if (!capable(CAP_NET_ADMIN)) | |
1057 | goto done; | |
1058 | ||
7daa0004 | 1059 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1060 | err = -EFAULT; |
1061 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1062 | goto done; | |
1063 | err = -ENOENT; | |
f57e7d5a | 1064 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1065 | goto done; |
1066 | err = -EPERM; | |
7daa0004 | 1067 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1068 | goto done; |
1069 | dev = t->dev; | |
1070 | } | |
22f8cde5 SH |
1071 | unregister_netdevice(dev); |
1072 | err = 0; | |
1da177e4 LT |
1073 | break; |
1074 | ||
1075 | default: | |
1076 | err = -EINVAL; | |
1077 | } | |
1078 | ||
1079 | done: | |
1080 | return err; | |
1081 | } | |
1082 | ||
1da177e4 LT |
1083 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1084 | { | |
2941a486 | 1085 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1086 | if (new_mtu < 68 || |
1087 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1088 | return -EINVAL; |
1089 | dev->mtu = new_mtu; | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1da177e4 LT |
1093 | /* Nice toy. Unfortunately, useless in real life :-) |
1094 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1095 | over the Internet, provided multicast routing is tuned. | |
1096 | ||
1097 | ||
1098 | I have no idea was this bicycle invented before me, | |
1099 | so that I had to set ARPHRD_IPGRE to a random value. | |
1100 | I have an impression, that Cisco could make something similar, | |
1101 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1102 | |
1da177e4 LT |
1103 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1104 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1105 | ||
1106 | ping -t 255 224.66.66.66 | |
1107 | ||
1108 | If nobody answers, mbone does not work. | |
1109 | ||
1110 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1111 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1112 | ifconfig Universe up | |
1113 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1114 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1115 | ftp 10.66.66.66 | |
1116 | ... | |
1117 | ftp fec0:6666:6666::193.233.7.65 | |
1118 | ... | |
1119 | ||
1120 | */ | |
1121 | ||
3b04ddde SH |
1122 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1123 | unsigned short type, | |
1124 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 | 1125 | { |
2941a486 | 1126 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1127 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1128 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1129 | |
1130 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1131 | p[0] = t->parms.o_flags; | |
1132 | p[1] = htons(type); | |
1133 | ||
1134 | /* | |
e905a9ed | 1135 | * Set the source hardware address. |
1da177e4 | 1136 | */ |
e905a9ed | 1137 | |
1da177e4 LT |
1138 | if (saddr) |
1139 | memcpy(&iph->saddr, saddr, 4); | |
1140 | ||
1141 | if (daddr) { | |
1142 | memcpy(&iph->daddr, daddr, 4); | |
1143 | return t->hlen; | |
1144 | } | |
f97c1e0c | 1145 | if (iph->daddr && !ipv4_is_multicast(iph->daddr)) |
1da177e4 | 1146 | return t->hlen; |
e905a9ed | 1147 | |
1da177e4 LT |
1148 | return -t->hlen; |
1149 | } | |
1150 | ||
6a5f44d7 TT |
1151 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1152 | { | |
6ed2533e | 1153 | struct iphdr *iph = (struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1154 | memcpy(haddr, &iph->saddr, 4); |
1155 | return 4; | |
1156 | } | |
1157 | ||
3b04ddde SH |
1158 | static const struct header_ops ipgre_header_ops = { |
1159 | .create = ipgre_header, | |
6a5f44d7 | 1160 | .parse = ipgre_header_parse, |
3b04ddde SH |
1161 | }; |
1162 | ||
6a5f44d7 | 1163 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1164 | static int ipgre_open(struct net_device *dev) |
1165 | { | |
2941a486 | 1166 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1167 | |
f97c1e0c | 1168 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
1da177e4 LT |
1169 | struct flowi fl = { .oif = t->parms.link, |
1170 | .nl_u = { .ip4_u = | |
1171 | { .daddr = t->parms.iph.daddr, | |
1172 | .saddr = t->parms.iph.saddr, | |
1173 | .tos = RT_TOS(t->parms.iph.tos) } }, | |
1174 | .proto = IPPROTO_GRE }; | |
1175 | struct rtable *rt; | |
96635522 | 1176 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
1da177e4 LT |
1177 | return -EADDRNOTAVAIL; |
1178 | dev = rt->u.dst.dev; | |
1179 | ip_rt_put(rt); | |
e5ed6399 | 1180 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1181 | return -EADDRNOTAVAIL; |
1182 | t->mlink = dev->ifindex; | |
e5ed6399 | 1183 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1184 | } |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | static int ipgre_close(struct net_device *dev) | |
1189 | { | |
2941a486 | 1190 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1191 | |
f97c1e0c | 1192 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1193 | struct in_device *in_dev; |
c346dca1 | 1194 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
1da177e4 LT |
1195 | if (in_dev) { |
1196 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); | |
1197 | in_dev_put(in_dev); | |
1198 | } | |
1199 | } | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | #endif | |
1204 | ||
b8c26a33 SH |
1205 | static const struct net_device_ops ipgre_netdev_ops = { |
1206 | .ndo_init = ipgre_tunnel_init, | |
1207 | .ndo_uninit = ipgre_tunnel_uninit, | |
1208 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1209 | .ndo_open = ipgre_open, | |
1210 | .ndo_stop = ipgre_close, | |
1211 | #endif | |
1212 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1213 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1214 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
1215 | }; | |
1216 | ||
1da177e4 LT |
1217 | static void ipgre_tunnel_setup(struct net_device *dev) |
1218 | { | |
b8c26a33 | 1219 | dev->netdev_ops = &ipgre_netdev_ops; |
1da177e4 | 1220 | dev->destructor = free_netdev; |
1da177e4 LT |
1221 | |
1222 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1223 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1224 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1225 | dev->flags = IFF_NOARP; |
1226 | dev->iflink = 0; | |
1227 | dev->addr_len = 4; | |
0b67eceb | 1228 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1229 | } |
1230 | ||
1231 | static int ipgre_tunnel_init(struct net_device *dev) | |
1232 | { | |
1da177e4 LT |
1233 | struct ip_tunnel *tunnel; |
1234 | struct iphdr *iph; | |
1da177e4 | 1235 | |
2941a486 | 1236 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1237 | iph = &tunnel->parms.iph; |
1238 | ||
1239 | tunnel->dev = dev; | |
1240 | strcpy(tunnel->parms.name, dev->name); | |
1241 | ||
1242 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1243 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1244 | ||
1da177e4 | 1245 | if (iph->daddr) { |
1da177e4 | 1246 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1247 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1248 | if (!iph->saddr) |
1249 | return -EINVAL; | |
1250 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1251 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1252 | } |
1253 | #endif | |
ee34c1eb | 1254 | } else |
6a5f44d7 | 1255 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1256 | |
1da177e4 LT |
1257 | return 0; |
1258 | } | |
1259 | ||
b8c26a33 | 1260 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1261 | { |
2941a486 | 1262 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1263 | struct iphdr *iph = &tunnel->parms.iph; |
eb8ce741 | 1264 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
1da177e4 LT |
1265 | |
1266 | tunnel->dev = dev; | |
1267 | strcpy(tunnel->parms.name, dev->name); | |
1268 | ||
1269 | iph->version = 4; | |
1270 | iph->protocol = IPPROTO_GRE; | |
1271 | iph->ihl = 5; | |
1272 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1273 | ||
1274 | dev_hold(dev); | |
eb8ce741 | 1275 | ign->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1276 | } |
1277 | ||
1278 | ||
1279 | static struct net_protocol ipgre_protocol = { | |
1280 | .handler = ipgre_rcv, | |
1281 | .err_handler = ipgre_err, | |
f96c148f | 1282 | .netns_ok = 1, |
1da177e4 LT |
1283 | }; |
1284 | ||
eb8ce741 PE |
1285 | static void ipgre_destroy_tunnels(struct ipgre_net *ign) |
1286 | { | |
1287 | int prio; | |
1288 | ||
1289 | for (prio = 0; prio < 4; prio++) { | |
1290 | int h; | |
1291 | for (h = 0; h < HASH_SIZE; h++) { | |
1292 | struct ip_tunnel *t; | |
1293 | while ((t = ign->tunnels[prio][h]) != NULL) | |
1294 | unregister_netdevice(t->dev); | |
1295 | } | |
1296 | } | |
1297 | } | |
1298 | ||
59a4c759 PE |
1299 | static int ipgre_init_net(struct net *net) |
1300 | { | |
1301 | int err; | |
1302 | struct ipgre_net *ign; | |
1303 | ||
1304 | err = -ENOMEM; | |
eb8ce741 | 1305 | ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL); |
59a4c759 PE |
1306 | if (ign == NULL) |
1307 | goto err_alloc; | |
1308 | ||
1309 | err = net_assign_generic(net, ipgre_net_id, ign); | |
1310 | if (err < 0) | |
1311 | goto err_assign; | |
1312 | ||
7daa0004 PE |
1313 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1314 | ipgre_tunnel_setup); | |
1315 | if (!ign->fb_tunnel_dev) { | |
1316 | err = -ENOMEM; | |
1317 | goto err_alloc_dev; | |
1318 | } | |
be77e593 | 1319 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1320 | |
b8c26a33 | 1321 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1322 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1323 | |
1324 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1325 | goto err_reg_dev; | |
1326 | ||
59a4c759 PE |
1327 | return 0; |
1328 | ||
7daa0004 PE |
1329 | err_reg_dev: |
1330 | free_netdev(ign->fb_tunnel_dev); | |
1331 | err_alloc_dev: | |
1332 | /* nothing */ | |
59a4c759 PE |
1333 | err_assign: |
1334 | kfree(ign); | |
1335 | err_alloc: | |
1336 | return err; | |
1337 | } | |
1338 | ||
1339 | static void ipgre_exit_net(struct net *net) | |
1340 | { | |
1341 | struct ipgre_net *ign; | |
1342 | ||
1343 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1344 | rtnl_lock(); |
eb8ce741 | 1345 | ipgre_destroy_tunnels(ign); |
7daa0004 | 1346 | rtnl_unlock(); |
59a4c759 PE |
1347 | kfree(ign); |
1348 | } | |
1349 | ||
1350 | static struct pernet_operations ipgre_net_ops = { | |
1351 | .init = ipgre_init_net, | |
1352 | .exit = ipgre_exit_net, | |
1353 | }; | |
1da177e4 | 1354 | |
c19e654d HX |
1355 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1356 | { | |
1357 | __be16 flags; | |
1358 | ||
1359 | if (!data) | |
1360 | return 0; | |
1361 | ||
1362 | flags = 0; | |
1363 | if (data[IFLA_GRE_IFLAGS]) | |
1364 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1365 | if (data[IFLA_GRE_OFLAGS]) | |
1366 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1367 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1368 | return -EINVAL; | |
1369 | ||
1370 | return 0; | |
1371 | } | |
1372 | ||
e1a80002 HX |
1373 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1374 | { | |
1375 | __be32 daddr; | |
1376 | ||
1377 | if (tb[IFLA_ADDRESS]) { | |
1378 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1379 | return -EINVAL; | |
1380 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1381 | return -EADDRNOTAVAIL; | |
1382 | } | |
1383 | ||
1384 | if (!data) | |
1385 | goto out; | |
1386 | ||
1387 | if (data[IFLA_GRE_REMOTE]) { | |
1388 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1389 | if (!daddr) | |
1390 | return -EINVAL; | |
1391 | } | |
1392 | ||
1393 | out: | |
1394 | return ipgre_tunnel_validate(tb, data); | |
1395 | } | |
1396 | ||
c19e654d HX |
1397 | static void ipgre_netlink_parms(struct nlattr *data[], |
1398 | struct ip_tunnel_parm *parms) | |
1399 | { | |
7bb82d92 | 1400 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1401 | |
1402 | parms->iph.protocol = IPPROTO_GRE; | |
1403 | ||
1404 | if (!data) | |
1405 | return; | |
1406 | ||
1407 | if (data[IFLA_GRE_LINK]) | |
1408 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1409 | ||
1410 | if (data[IFLA_GRE_IFLAGS]) | |
1411 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1412 | ||
1413 | if (data[IFLA_GRE_OFLAGS]) | |
1414 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1415 | ||
1416 | if (data[IFLA_GRE_IKEY]) | |
1417 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1418 | ||
1419 | if (data[IFLA_GRE_OKEY]) | |
1420 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1421 | ||
1422 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1423 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1424 | |
1425 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1426 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1427 | |
1428 | if (data[IFLA_GRE_TTL]) | |
1429 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1430 | ||
1431 | if (data[IFLA_GRE_TOS]) | |
1432 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1433 | ||
1434 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1435 | parms->iph.frag_off = htons(IP_DF); | |
1436 | } | |
1437 | ||
e1a80002 HX |
1438 | static int ipgre_tap_init(struct net_device *dev) |
1439 | { | |
1440 | struct ip_tunnel *tunnel; | |
1441 | ||
1442 | tunnel = netdev_priv(dev); | |
1443 | ||
1444 | tunnel->dev = dev; | |
1445 | strcpy(tunnel->parms.name, dev->name); | |
1446 | ||
1447 | ipgre_tunnel_bind_dev(dev); | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
b8c26a33 SH |
1452 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1453 | .ndo_init = ipgre_tap_init, | |
1454 | .ndo_uninit = ipgre_tunnel_uninit, | |
1455 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1456 | .ndo_set_mac_address = eth_mac_addr, | |
1457 | .ndo_validate_addr = eth_validate_addr, | |
1458 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
1459 | }; | |
1460 | ||
e1a80002 HX |
1461 | static void ipgre_tap_setup(struct net_device *dev) |
1462 | { | |
1463 | ||
1464 | ether_setup(dev); | |
1465 | ||
b8c26a33 | 1466 | dev->netdev_ops = &ipgre_netdev_ops; |
e1a80002 | 1467 | dev->destructor = free_netdev; |
e1a80002 HX |
1468 | |
1469 | dev->iflink = 0; | |
1470 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1471 | } | |
1472 | ||
c19e654d HX |
1473 | static int ipgre_newlink(struct net_device *dev, struct nlattr *tb[], |
1474 | struct nlattr *data[]) | |
1475 | { | |
1476 | struct ip_tunnel *nt; | |
1477 | struct net *net = dev_net(dev); | |
1478 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1479 | int mtu; | |
1480 | int err; | |
1481 | ||
1482 | nt = netdev_priv(dev); | |
1483 | ipgre_netlink_parms(data, &nt->parms); | |
1484 | ||
e1a80002 | 1485 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1486 | return -EEXIST; |
1487 | ||
e1a80002 HX |
1488 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1489 | random_ether_addr(dev->dev_addr); | |
1490 | ||
c19e654d HX |
1491 | mtu = ipgre_tunnel_bind_dev(dev); |
1492 | if (!tb[IFLA_MTU]) | |
1493 | dev->mtu = mtu; | |
1494 | ||
1495 | err = register_netdevice(dev); | |
1496 | if (err) | |
1497 | goto out; | |
1498 | ||
1499 | dev_hold(dev); | |
1500 | ipgre_tunnel_link(ign, nt); | |
1501 | ||
1502 | out: | |
1503 | return err; | |
1504 | } | |
1505 | ||
1506 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1507 | struct nlattr *data[]) | |
1508 | { | |
1509 | struct ip_tunnel *t, *nt; | |
1510 | struct net *net = dev_net(dev); | |
1511 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1512 | struct ip_tunnel_parm p; | |
1513 | int mtu; | |
1514 | ||
1515 | if (dev == ign->fb_tunnel_dev) | |
1516 | return -EINVAL; | |
1517 | ||
1518 | nt = netdev_priv(dev); | |
1519 | ipgre_netlink_parms(data, &p); | |
1520 | ||
1521 | t = ipgre_tunnel_locate(net, &p, 0); | |
1522 | ||
1523 | if (t) { | |
1524 | if (t->dev != dev) | |
1525 | return -EEXIST; | |
1526 | } else { | |
1527 | unsigned nflags = 0; | |
1528 | ||
1529 | t = nt; | |
1530 | ||
1531 | if (ipv4_is_multicast(p.iph.daddr)) | |
1532 | nflags = IFF_BROADCAST; | |
1533 | else if (p.iph.daddr) | |
1534 | nflags = IFF_POINTOPOINT; | |
1535 | ||
1536 | if ((dev->flags ^ nflags) & | |
1537 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1538 | return -EINVAL; | |
1539 | ||
1540 | ipgre_tunnel_unlink(ign, t); | |
1541 | t->parms.iph.saddr = p.iph.saddr; | |
1542 | t->parms.iph.daddr = p.iph.daddr; | |
1543 | t->parms.i_key = p.i_key; | |
1544 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1545 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1546 | ipgre_tunnel_link(ign, t); | |
1547 | netdev_state_change(dev); | |
1548 | } | |
1549 | ||
1550 | t->parms.o_key = p.o_key; | |
1551 | t->parms.iph.ttl = p.iph.ttl; | |
1552 | t->parms.iph.tos = p.iph.tos; | |
1553 | t->parms.iph.frag_off = p.iph.frag_off; | |
1554 | ||
1555 | if (t->parms.link != p.link) { | |
1556 | t->parms.link = p.link; | |
1557 | mtu = ipgre_tunnel_bind_dev(dev); | |
1558 | if (!tb[IFLA_MTU]) | |
1559 | dev->mtu = mtu; | |
1560 | netdev_state_change(dev); | |
1561 | } | |
1562 | ||
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | static size_t ipgre_get_size(const struct net_device *dev) | |
1567 | { | |
1568 | return | |
1569 | /* IFLA_GRE_LINK */ | |
1570 | nla_total_size(4) + | |
1571 | /* IFLA_GRE_IFLAGS */ | |
1572 | nla_total_size(2) + | |
1573 | /* IFLA_GRE_OFLAGS */ | |
1574 | nla_total_size(2) + | |
1575 | /* IFLA_GRE_IKEY */ | |
1576 | nla_total_size(4) + | |
1577 | /* IFLA_GRE_OKEY */ | |
1578 | nla_total_size(4) + | |
1579 | /* IFLA_GRE_LOCAL */ | |
1580 | nla_total_size(4) + | |
1581 | /* IFLA_GRE_REMOTE */ | |
1582 | nla_total_size(4) + | |
1583 | /* IFLA_GRE_TTL */ | |
1584 | nla_total_size(1) + | |
1585 | /* IFLA_GRE_TOS */ | |
1586 | nla_total_size(1) + | |
1587 | /* IFLA_GRE_PMTUDISC */ | |
1588 | nla_total_size(1) + | |
1589 | 0; | |
1590 | } | |
1591 | ||
1592 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1593 | { | |
1594 | struct ip_tunnel *t = netdev_priv(dev); | |
1595 | struct ip_tunnel_parm *p = &t->parms; | |
1596 | ||
1597 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1598 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1599 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
ba9e64b1 PM |
1600 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
1601 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); | |
4d74f8ba PM |
1602 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
1603 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); | |
c19e654d HX |
1604 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
1605 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1606 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1607 | ||
1608 | return 0; | |
1609 | ||
1610 | nla_put_failure: | |
1611 | return -EMSGSIZE; | |
1612 | } | |
1613 | ||
1614 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1615 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1616 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1617 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1618 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1619 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1620 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1621 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1622 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1623 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1624 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1625 | }; | |
1626 | ||
1627 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1628 | .kind = "gre", | |
1629 | .maxtype = IFLA_GRE_MAX, | |
1630 | .policy = ipgre_policy, | |
1631 | .priv_size = sizeof(struct ip_tunnel), | |
1632 | .setup = ipgre_tunnel_setup, | |
1633 | .validate = ipgre_tunnel_validate, | |
1634 | .newlink = ipgre_newlink, | |
1635 | .changelink = ipgre_changelink, | |
1636 | .get_size = ipgre_get_size, | |
1637 | .fill_info = ipgre_fill_info, | |
1638 | }; | |
1639 | ||
e1a80002 HX |
1640 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1641 | .kind = "gretap", | |
1642 | .maxtype = IFLA_GRE_MAX, | |
1643 | .policy = ipgre_policy, | |
1644 | .priv_size = sizeof(struct ip_tunnel), | |
1645 | .setup = ipgre_tap_setup, | |
1646 | .validate = ipgre_tap_validate, | |
1647 | .newlink = ipgre_newlink, | |
1648 | .changelink = ipgre_changelink, | |
1649 | .get_size = ipgre_get_size, | |
1650 | .fill_info = ipgre_fill_info, | |
1651 | }; | |
1652 | ||
1da177e4 LT |
1653 | /* |
1654 | * And now the modules code and kernel interface. | |
1655 | */ | |
1656 | ||
1657 | static int __init ipgre_init(void) | |
1658 | { | |
1659 | int err; | |
1660 | ||
1661 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1662 | ||
1663 | if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) { | |
1664 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1665 | return -EAGAIN; | |
1666 | } | |
1667 | ||
59a4c759 PE |
1668 | err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops); |
1669 | if (err < 0) | |
c19e654d | 1670 | goto gen_device_failed; |
7daa0004 | 1671 | |
c19e654d HX |
1672 | err = rtnl_link_register(&ipgre_link_ops); |
1673 | if (err < 0) | |
1674 | goto rtnl_link_failed; | |
1675 | ||
e1a80002 HX |
1676 | err = rtnl_link_register(&ipgre_tap_ops); |
1677 | if (err < 0) | |
1678 | goto tap_ops_failed; | |
1679 | ||
c19e654d | 1680 | out: |
1da177e4 | 1681 | return err; |
c19e654d | 1682 | |
e1a80002 HX |
1683 | tap_ops_failed: |
1684 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d HX |
1685 | rtnl_link_failed: |
1686 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1687 | gen_device_failed: | |
1688 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); | |
1689 | goto out; | |
1da177e4 LT |
1690 | } |
1691 | ||
db44575f | 1692 | static void __exit ipgre_fini(void) |
1da177e4 | 1693 | { |
e1a80002 | 1694 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d HX |
1695 | rtnl_link_unregister(&ipgre_link_ops); |
1696 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1da177e4 LT |
1697 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
1698 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); | |
1da177e4 LT |
1699 | } |
1700 | ||
1701 | module_init(ipgre_init); | |
1702 | module_exit(ipgre_fini); | |
1703 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1704 | MODULE_ALIAS_RTNL_LINK("gre"); |
1705 | MODULE_ALIAS_RTNL_LINK("gretap"); |