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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 | ||
129 | static int ipgre_fb_tunnel_init(struct net_device *dev); | |
130 | ||
eb8ce741 PE |
131 | #define HASH_SIZE 16 |
132 | ||
59a4c759 PE |
133 | static int ipgre_net_id; |
134 | struct ipgre_net { | |
eb8ce741 PE |
135 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
136 | ||
7daa0004 | 137 | struct net_device *fb_tunnel_dev; |
59a4c759 PE |
138 | }; |
139 | ||
1da177e4 LT |
140 | /* Tunnel hash table */ |
141 | ||
142 | /* | |
143 | 4 hash tables: | |
144 | ||
145 | 3: (remote,local) | |
146 | 2: (remote,*) | |
147 | 1: (*,local) | |
148 | 0: (*,*) | |
149 | ||
150 | We require exact key match i.e. if a key is present in packet | |
151 | it will match only tunnel with the same key; if it is not present, | |
152 | it will match only keyless tunnel. | |
153 | ||
154 | All keysless packets, if not matched configured keyless tunnels | |
155 | will match fallback tunnel. | |
156 | */ | |
157 | ||
d5a0a1e3 | 158 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 159 | |
eb8ce741 PE |
160 | #define tunnels_r_l tunnels[3] |
161 | #define tunnels_r tunnels[2] | |
162 | #define tunnels_l tunnels[1] | |
163 | #define tunnels_wc tunnels[0] | |
1da177e4 LT |
164 | |
165 | static DEFINE_RWLOCK(ipgre_lock); | |
166 | ||
167 | /* Given src, dst and key, find appropriate for input tunnel. */ | |
168 | ||
f57e7d5a | 169 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net, |
e1a80002 HX |
170 | __be32 remote, __be32 local, |
171 | __be32 key, __be16 gre_proto) | |
1da177e4 LT |
172 | { |
173 | unsigned h0 = HASH(remote); | |
174 | unsigned h1 = HASH(key); | |
175 | struct ip_tunnel *t; | |
e1a80002 | 176 | struct ip_tunnel *t2 = NULL; |
7daa0004 | 177 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
178 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
179 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
1da177e4 | 180 | |
eb8ce741 | 181 | for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 | 182 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) { |
e1a80002 HX |
183 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
184 | if (t->dev->type == dev_type) | |
185 | return t; | |
186 | if (t->dev->type == ARPHRD_IPGRE && !t2) | |
187 | t2 = t; | |
188 | } | |
1da177e4 LT |
189 | } |
190 | } | |
e1a80002 | 191 | |
eb8ce741 | 192 | for (t = ign->tunnels_r[h0^h1]; t; t = t->next) { |
1da177e4 | 193 | if (remote == t->parms.iph.daddr) { |
e1a80002 HX |
194 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
195 | if (t->dev->type == dev_type) | |
196 | return t; | |
197 | if (t->dev->type == ARPHRD_IPGRE && !t2) | |
198 | t2 = t; | |
199 | } | |
1da177e4 LT |
200 | } |
201 | } | |
e1a80002 | 202 | |
eb8ce741 | 203 | for (t = ign->tunnels_l[h1]; t; t = t->next) { |
1da177e4 | 204 | if (local == t->parms.iph.saddr || |
f97c1e0c JP |
205 | (local == t->parms.iph.daddr && |
206 | ipv4_is_multicast(local))) { | |
e1a80002 HX |
207 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
208 | if (t->dev->type == dev_type) | |
209 | return t; | |
210 | if (t->dev->type == ARPHRD_IPGRE && !t2) | |
211 | t2 = t; | |
212 | } | |
1da177e4 LT |
213 | } |
214 | } | |
e1a80002 | 215 | |
eb8ce741 | 216 | for (t = ign->tunnels_wc[h1]; t; t = t->next) { |
e1a80002 HX |
217 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
218 | if (t->dev->type == dev_type) | |
219 | return t; | |
220 | if (t->dev->type == ARPHRD_IPGRE && !t2) | |
221 | t2 = t; | |
222 | } | |
1da177e4 LT |
223 | } |
224 | ||
e1a80002 HX |
225 | if (t2) |
226 | return t2; | |
227 | ||
7daa0004 PE |
228 | if (ign->fb_tunnel_dev->flags&IFF_UP) |
229 | return netdev_priv(ign->fb_tunnel_dev); | |
1da177e4 LT |
230 | return NULL; |
231 | } | |
232 | ||
f57e7d5a PE |
233 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
234 | struct ip_tunnel_parm *parms) | |
1da177e4 | 235 | { |
5056a1ef YH |
236 | __be32 remote = parms->iph.daddr; |
237 | __be32 local = parms->iph.saddr; | |
238 | __be32 key = parms->i_key; | |
1da177e4 LT |
239 | unsigned h = HASH(key); |
240 | int prio = 0; | |
241 | ||
242 | if (local) | |
243 | prio |= 1; | |
f97c1e0c | 244 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
245 | prio |= 2; |
246 | h ^= HASH(remote); | |
247 | } | |
248 | ||
eb8ce741 | 249 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
250 | } |
251 | ||
f57e7d5a PE |
252 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
253 | struct ip_tunnel *t) | |
5056a1ef | 254 | { |
f57e7d5a | 255 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
256 | } |
257 | ||
f57e7d5a | 258 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 259 | { |
f57e7d5a | 260 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
1da177e4 LT |
261 | |
262 | t->next = *tp; | |
263 | write_lock_bh(&ipgre_lock); | |
264 | *tp = t; | |
265 | write_unlock_bh(&ipgre_lock); | |
266 | } | |
267 | ||
f57e7d5a | 268 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 LT |
269 | { |
270 | struct ip_tunnel **tp; | |
271 | ||
f57e7d5a | 272 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
273 | if (t == *tp) { |
274 | write_lock_bh(&ipgre_lock); | |
275 | *tp = t->next; | |
276 | write_unlock_bh(&ipgre_lock); | |
277 | break; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
e1a80002 HX |
282 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
283 | struct ip_tunnel_parm *parms, | |
284 | int type) | |
1da177e4 | 285 | { |
d5a0a1e3 AV |
286 | __be32 remote = parms->iph.daddr; |
287 | __be32 local = parms->iph.saddr; | |
288 | __be32 key = parms->i_key; | |
e1a80002 HX |
289 | struct ip_tunnel *t, **tp; |
290 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
291 | ||
292 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) | |
293 | if (local == t->parms.iph.saddr && | |
294 | remote == t->parms.iph.daddr && | |
295 | key == t->parms.i_key && | |
296 | type == t->dev->type) | |
297 | break; | |
298 | ||
299 | return t; | |
300 | } | |
301 | ||
302 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, | |
303 | struct ip_tunnel_parm *parms, int create) | |
304 | { | |
305 | struct ip_tunnel *t, *nt; | |
1da177e4 | 306 | struct net_device *dev; |
1da177e4 | 307 | char name[IFNAMSIZ]; |
f57e7d5a | 308 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 309 | |
e1a80002 HX |
310 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
311 | if (t || !create) | |
312 | return t; | |
1da177e4 LT |
313 | |
314 | if (parms->name[0]) | |
315 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
316 | else |
317 | sprintf(name, "gre%%d"); | |
1da177e4 LT |
318 | |
319 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
320 | if (!dev) | |
321 | return NULL; | |
322 | ||
0b67eceb PE |
323 | dev_net_set(dev, net); |
324 | ||
b37d428b PE |
325 | if (strchr(name, '%')) { |
326 | if (dev_alloc_name(dev, name) < 0) | |
327 | goto failed_free; | |
328 | } | |
329 | ||
2941a486 | 330 | nt = netdev_priv(dev); |
1da177e4 | 331 | nt->parms = *parms; |
c19e654d | 332 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 333 | |
42aa9162 HX |
334 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
335 | ||
b37d428b PE |
336 | if (register_netdevice(dev) < 0) |
337 | goto failed_free; | |
1da177e4 | 338 | |
1da177e4 | 339 | dev_hold(dev); |
f57e7d5a | 340 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
341 | return nt; |
342 | ||
b37d428b PE |
343 | failed_free: |
344 | free_netdev(dev); | |
1da177e4 LT |
345 | return NULL; |
346 | } | |
347 | ||
348 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
349 | { | |
f57e7d5a PE |
350 | struct net *net = dev_net(dev); |
351 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
352 | ||
353 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
354 | dev_put(dev); |
355 | } | |
356 | ||
357 | ||
358 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
359 | { | |
1da177e4 | 360 | |
071f92d0 | 361 | /* All the routers (except for Linux) return only |
1da177e4 LT |
362 | 8 bytes of packet payload. It means, that precise relaying of |
363 | ICMP in the real Internet is absolutely infeasible. | |
364 | ||
365 | Moreover, Cisco "wise men" put GRE key to the third word | |
366 | in GRE header. It makes impossible maintaining even soft state for keyed | |
367 | GRE tunnels with enabled checksum. Tell them "thank you". | |
368 | ||
369 | Well, I wonder, rfc1812 was written by Cisco employee, | |
370 | what the hell these idiots break standrads established | |
371 | by themself??? | |
372 | */ | |
373 | ||
374 | struct iphdr *iph = (struct iphdr*)skb->data; | |
d5a0a1e3 | 375 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 376 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
377 | const int type = icmp_hdr(skb)->type; |
378 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 379 | struct ip_tunnel *t; |
d5a0a1e3 | 380 | __be16 flags; |
1da177e4 LT |
381 | |
382 | flags = p[0]; | |
383 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
384 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
385 | return; | |
386 | if (flags&GRE_KEY) { | |
387 | grehlen += 4; | |
388 | if (flags&GRE_CSUM) | |
389 | grehlen += 4; | |
390 | } | |
391 | } | |
392 | ||
393 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
394 | if (skb_headlen(skb) < grehlen) | |
395 | return; | |
396 | ||
397 | switch (type) { | |
398 | default: | |
399 | case ICMP_PARAMETERPROB: | |
400 | return; | |
401 | ||
402 | case ICMP_DEST_UNREACH: | |
403 | switch (code) { | |
404 | case ICMP_SR_FAILED: | |
405 | case ICMP_PORT_UNREACH: | |
406 | /* Impossible event. */ | |
407 | return; | |
408 | case ICMP_FRAG_NEEDED: | |
409 | /* Soft state for pmtu is maintained by IP core. */ | |
410 | return; | |
411 | default: | |
412 | /* All others are translated to HOST_UNREACH. | |
413 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
414 | I believe they are just ether pollution. --ANK | |
415 | */ | |
416 | break; | |
417 | } | |
418 | break; | |
419 | case ICMP_TIME_EXCEEDED: | |
420 | if (code != ICMP_EXC_TTL) | |
421 | return; | |
422 | break; | |
423 | } | |
424 | ||
425 | read_lock(&ipgre_lock); | |
3b4667f3 | 426 | t = ipgre_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr, |
e1a80002 HX |
427 | flags & GRE_KEY ? |
428 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
429 | p[1]); | |
f97c1e0c JP |
430 | if (t == NULL || t->parms.iph.daddr == 0 || |
431 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
432 | goto out; |
433 | ||
434 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
435 | goto out; | |
436 | ||
437 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
438 | t->err_count++; | |
439 | else | |
440 | t->err_count = 1; | |
441 | t->err_time = jiffies; | |
442 | out: | |
443 | read_unlock(&ipgre_lock); | |
444 | return; | |
1da177e4 LT |
445 | } |
446 | ||
447 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
448 | { | |
449 | if (INET_ECN_is_ce(iph->tos)) { | |
450 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 451 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 452 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 453 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
454 | } |
455 | } | |
456 | } | |
457 | ||
458 | static inline u8 | |
459 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) | |
460 | { | |
461 | u8 inner = 0; | |
462 | if (skb->protocol == htons(ETH_P_IP)) | |
463 | inner = old_iph->tos; | |
464 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
465 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); | |
466 | return INET_ECN_encapsulate(tos, inner); | |
467 | } | |
468 | ||
469 | static int ipgre_rcv(struct sk_buff *skb) | |
470 | { | |
471 | struct iphdr *iph; | |
472 | u8 *h; | |
d5a0a1e3 | 473 | __be16 flags; |
d3bc23e7 | 474 | __sum16 csum = 0; |
d5a0a1e3 | 475 | __be32 key = 0; |
1da177e4 LT |
476 | u32 seqno = 0; |
477 | struct ip_tunnel *tunnel; | |
478 | int offset = 4; | |
e1a80002 | 479 | __be16 gre_proto; |
1da177e4 LT |
480 | |
481 | if (!pskb_may_pull(skb, 16)) | |
482 | goto drop_nolock; | |
483 | ||
eddc9ec5 | 484 | iph = ip_hdr(skb); |
1da177e4 | 485 | h = skb->data; |
d5a0a1e3 | 486 | flags = *(__be16*)h; |
1da177e4 LT |
487 | |
488 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
489 | /* - Version must be 0. | |
490 | - We do not support routing headers. | |
491 | */ | |
492 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
493 | goto drop_nolock; | |
494 | ||
495 | if (flags&GRE_CSUM) { | |
fb286bb2 | 496 | switch (skb->ip_summed) { |
84fa7933 | 497 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 498 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
499 | if (!csum) |
500 | break; | |
501 | /* fall through */ | |
502 | case CHECKSUM_NONE: | |
503 | skb->csum = 0; | |
504 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 505 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
506 | } |
507 | offset += 4; | |
508 | } | |
509 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 510 | key = *(__be32*)(h + offset); |
1da177e4 LT |
511 | offset += 4; |
512 | } | |
513 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 514 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
515 | offset += 4; |
516 | } | |
517 | } | |
518 | ||
e1a80002 HX |
519 | gre_proto = *(__be16 *)(h + 2); |
520 | ||
1da177e4 | 521 | read_lock(&ipgre_lock); |
3b4667f3 | 522 | if ((tunnel = ipgre_tunnel_lookup(dev_net(skb->dev), |
e1a80002 HX |
523 | iph->saddr, iph->daddr, key, |
524 | gre_proto))) { | |
addd68eb PE |
525 | struct net_device_stats *stats = &tunnel->dev->stats; |
526 | ||
1da177e4 LT |
527 | secpath_reset(skb); |
528 | ||
e1a80002 | 529 | skb->protocol = gre_proto; |
1da177e4 LT |
530 | /* WCCP version 1 and 2 protocol decoding. |
531 | * - Change protocol to IP | |
532 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
533 | */ | |
e1a80002 | 534 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 535 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 536 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
537 | offset += 4; |
538 | } | |
539 | ||
1d069167 | 540 | skb->mac_header = skb->network_header; |
4209fb60 | 541 | __pskb_pull(skb, offset); |
9c70220b | 542 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
543 | skb->pkt_type = PACKET_HOST; |
544 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 545 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 546 | /* Looped back packet, drop it! */ |
ee6b9673 | 547 | if (skb->rtable->fl.iif == 0) |
1da177e4 | 548 | goto drop; |
addd68eb | 549 | stats->multicast++; |
1da177e4 LT |
550 | skb->pkt_type = PACKET_BROADCAST; |
551 | } | |
552 | #endif | |
553 | ||
554 | if (((flags&GRE_CSUM) && csum) || | |
555 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
addd68eb PE |
556 | stats->rx_crc_errors++; |
557 | stats->rx_errors++; | |
1da177e4 LT |
558 | goto drop; |
559 | } | |
560 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
561 | if (!(flags&GRE_SEQ) || | |
562 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
addd68eb PE |
563 | stats->rx_fifo_errors++; |
564 | stats->rx_errors++; | |
1da177e4 LT |
565 | goto drop; |
566 | } | |
567 | tunnel->i_seqno = seqno + 1; | |
568 | } | |
e1a80002 HX |
569 | |
570 | /* Warning: All skb pointers will be invalidated! */ | |
571 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
572 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
573 | stats->rx_length_errors++; | |
574 | stats->rx_errors++; | |
575 | goto drop; | |
576 | } | |
577 | ||
578 | iph = ip_hdr(skb); | |
579 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
580 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
581 | } | |
582 | ||
addd68eb PE |
583 | stats->rx_packets++; |
584 | stats->rx_bytes += skb->len; | |
1da177e4 LT |
585 | skb->dev = tunnel->dev; |
586 | dst_release(skb->dst); | |
587 | skb->dst = NULL; | |
588 | nf_reset(skb); | |
e1a80002 HX |
589 | |
590 | skb_reset_network_header(skb); | |
1da177e4 | 591 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 592 | |
1da177e4 LT |
593 | netif_rx(skb); |
594 | read_unlock(&ipgre_lock); | |
595 | return(0); | |
596 | } | |
45af08be | 597 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
598 | |
599 | drop: | |
600 | read_unlock(&ipgre_lock); | |
601 | drop_nolock: | |
602 | kfree_skb(skb); | |
603 | return(0); | |
604 | } | |
605 | ||
606 | static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
607 | { | |
2941a486 | 608 | struct ip_tunnel *tunnel = netdev_priv(dev); |
addd68eb | 609 | struct net_device_stats *stats = &tunnel->dev->stats; |
eddc9ec5 | 610 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 LT |
611 | struct iphdr *tiph; |
612 | u8 tos; | |
d5a0a1e3 | 613 | __be16 df; |
1da177e4 LT |
614 | struct rtable *rt; /* Route to the other host */ |
615 | struct net_device *tdev; /* Device to other host */ | |
616 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 617 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 618 | int gre_hlen; |
d5a0a1e3 | 619 | __be32 dst; |
1da177e4 LT |
620 | int mtu; |
621 | ||
622 | if (tunnel->recursion++) { | |
addd68eb | 623 | stats->collisions++; |
1da177e4 LT |
624 | goto tx_error; |
625 | } | |
626 | ||
e1a80002 HX |
627 | if (dev->type == ARPHRD_ETHER) |
628 | IPCB(skb)->flags = 0; | |
629 | ||
630 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 LT |
631 | gre_hlen = 0; |
632 | tiph = (struct iphdr*)skb->data; | |
633 | } else { | |
634 | gre_hlen = tunnel->hlen; | |
635 | tiph = &tunnel->parms.iph; | |
636 | } | |
637 | ||
638 | if ((dst = tiph->daddr) == 0) { | |
639 | /* NBMA tunnel */ | |
640 | ||
641 | if (skb->dst == NULL) { | |
addd68eb | 642 | stats->tx_fifo_errors++; |
1da177e4 LT |
643 | goto tx_error; |
644 | } | |
645 | ||
646 | if (skb->protocol == htons(ETH_P_IP)) { | |
ee6b9673 | 647 | rt = skb->rtable; |
1da177e4 LT |
648 | if ((dst = rt->rt_gateway) == 0) |
649 | goto tx_error_icmp; | |
650 | } | |
651 | #ifdef CONFIG_IPV6 | |
652 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
653 | struct in6_addr *addr6; | |
654 | int addr_type; | |
655 | struct neighbour *neigh = skb->dst->neighbour; | |
656 | ||
657 | if (neigh == NULL) | |
658 | goto tx_error; | |
659 | ||
660 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
661 | addr_type = ipv6_addr_type(addr6); | |
662 | ||
663 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 664 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
665 | addr_type = ipv6_addr_type(addr6); |
666 | } | |
667 | ||
668 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
669 | goto tx_error_icmp; | |
670 | ||
671 | dst = addr6->s6_addr32[3]; | |
672 | } | |
673 | #endif | |
674 | else | |
675 | goto tx_error; | |
676 | } | |
677 | ||
678 | tos = tiph->tos; | |
679 | if (tos&1) { | |
680 | if (skb->protocol == htons(ETH_P_IP)) | |
681 | tos = old_iph->tos; | |
682 | tos &= ~1; | |
683 | } | |
684 | ||
685 | { | |
686 | struct flowi fl = { .oif = tunnel->parms.link, | |
687 | .nl_u = { .ip4_u = | |
688 | { .daddr = dst, | |
689 | .saddr = tiph->saddr, | |
690 | .tos = RT_TOS(tos) } }, | |
691 | .proto = IPPROTO_GRE }; | |
96635522 | 692 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
addd68eb | 693 | stats->tx_carrier_errors++; |
1da177e4 LT |
694 | goto tx_error; |
695 | } | |
696 | } | |
697 | tdev = rt->u.dst.dev; | |
698 | ||
699 | if (tdev == dev) { | |
700 | ip_rt_put(rt); | |
addd68eb | 701 | stats->collisions++; |
1da177e4 LT |
702 | goto tx_error; |
703 | } | |
704 | ||
705 | df = tiph->frag_off; | |
706 | if (df) | |
c95b819a | 707 | mtu = dst_mtu(&rt->u.dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 LT |
708 | else |
709 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
710 | ||
711 | if (skb->dst) | |
712 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
713 | ||
714 | if (skb->protocol == htons(ETH_P_IP)) { | |
715 | df |= (old_iph->frag_off&htons(IP_DF)); | |
716 | ||
717 | if ((old_iph->frag_off&htons(IP_DF)) && | |
718 | mtu < ntohs(old_iph->tot_len)) { | |
719 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
720 | ip_rt_put(rt); | |
721 | goto tx_error; | |
722 | } | |
723 | } | |
724 | #ifdef CONFIG_IPV6 | |
725 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
726 | struct rt6_info *rt6 = (struct rt6_info*)skb->dst; | |
727 | ||
728 | if (rt6 && mtu < dst_mtu(skb->dst) && mtu >= IPV6_MIN_MTU) { | |
f97c1e0c JP |
729 | if ((tunnel->parms.iph.daddr && |
730 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
731 | rt6->rt6i_dst.plen == 128) { |
732 | rt6->rt6i_flags |= RTF_MODIFIED; | |
733 | skb->dst->metrics[RTAX_MTU-1] = mtu; | |
734 | } | |
735 | } | |
736 | ||
737 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
738 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
739 | ip_rt_put(rt); | |
740 | goto tx_error; | |
741 | } | |
742 | } | |
743 | #endif | |
744 | ||
745 | if (tunnel->err_count > 0) { | |
746 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
747 | tunnel->err_count--; | |
748 | ||
749 | dst_link_failure(skb); | |
750 | } else | |
751 | tunnel->err_count = 0; | |
752 | } | |
753 | ||
754 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; | |
755 | ||
cfbba49d PM |
756 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
757 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
758 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
759 | if (!new_skb) { | |
760 | ip_rt_put(rt); | |
e905a9ed | 761 | stats->tx_dropped++; |
1da177e4 LT |
762 | dev_kfree_skb(skb); |
763 | tunnel->recursion--; | |
764 | return 0; | |
765 | } | |
766 | if (skb->sk) | |
767 | skb_set_owner_w(new_skb, skb->sk); | |
768 | dev_kfree_skb(skb); | |
769 | skb = new_skb; | |
eddc9ec5 | 770 | old_iph = ip_hdr(skb); |
1da177e4 LT |
771 | } |
772 | ||
b0e380b1 | 773 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
774 | skb_push(skb, gre_hlen); |
775 | skb_reset_network_header(skb); | |
1da177e4 | 776 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
777 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
778 | IPSKB_REROUTED); | |
1da177e4 LT |
779 | dst_release(skb->dst); |
780 | skb->dst = &rt->u.dst; | |
781 | ||
782 | /* | |
783 | * Push down and install the IPIP header. | |
784 | */ | |
785 | ||
eddc9ec5 | 786 | iph = ip_hdr(skb); |
1da177e4 LT |
787 | iph->version = 4; |
788 | iph->ihl = sizeof(struct iphdr) >> 2; | |
789 | iph->frag_off = df; | |
790 | iph->protocol = IPPROTO_GRE; | |
791 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
792 | iph->daddr = rt->rt_dst; | |
793 | iph->saddr = rt->rt_src; | |
794 | ||
795 | if ((iph->ttl = tiph->ttl) == 0) { | |
796 | if (skb->protocol == htons(ETH_P_IP)) | |
797 | iph->ttl = old_iph->ttl; | |
798 | #ifdef CONFIG_IPV6 | |
799 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
800 | iph->ttl = ((struct ipv6hdr*)old_iph)->hop_limit; | |
801 | #endif | |
802 | else | |
803 | iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); | |
804 | } | |
805 | ||
e1a80002 HX |
806 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
807 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
808 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
809 | |
810 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 811 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
812 | |
813 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
814 | ++tunnel->o_seqno; | |
815 | *ptr = htonl(tunnel->o_seqno); | |
816 | ptr--; | |
817 | } | |
818 | if (tunnel->parms.o_flags&GRE_KEY) { | |
819 | *ptr = tunnel->parms.o_key; | |
820 | ptr--; | |
821 | } | |
822 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
823 | *ptr = 0; | |
5f92a738 | 824 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
825 | } |
826 | } | |
827 | ||
828 | nf_reset(skb); | |
829 | ||
830 | IPTUNNEL_XMIT(); | |
831 | tunnel->recursion--; | |
832 | return 0; | |
833 | ||
834 | tx_error_icmp: | |
835 | dst_link_failure(skb); | |
836 | ||
837 | tx_error: | |
838 | stats->tx_errors++; | |
839 | dev_kfree_skb(skb); | |
840 | tunnel->recursion--; | |
841 | return 0; | |
842 | } | |
843 | ||
42aa9162 | 844 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
845 | { |
846 | struct net_device *tdev = NULL; | |
847 | struct ip_tunnel *tunnel; | |
848 | struct iphdr *iph; | |
849 | int hlen = LL_MAX_HEADER; | |
850 | int mtu = ETH_DATA_LEN; | |
851 | int addend = sizeof(struct iphdr) + 4; | |
852 | ||
853 | tunnel = netdev_priv(dev); | |
854 | iph = &tunnel->parms.iph; | |
855 | ||
c95b819a | 856 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
857 | |
858 | if (iph->daddr) { | |
859 | struct flowi fl = { .oif = tunnel->parms.link, | |
860 | .nl_u = { .ip4_u = | |
861 | { .daddr = iph->daddr, | |
862 | .saddr = iph->saddr, | |
863 | .tos = RT_TOS(iph->tos) } }, | |
864 | .proto = IPPROTO_GRE }; | |
865 | struct rtable *rt; | |
96635522 | 866 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
ee34c1eb MS |
867 | tdev = rt->u.dst.dev; |
868 | ip_rt_put(rt); | |
869 | } | |
e1a80002 HX |
870 | |
871 | if (dev->type != ARPHRD_ETHER) | |
872 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
873 | } |
874 | ||
875 | if (!tdev && tunnel->parms.link) | |
96635522 | 876 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
877 | |
878 | if (tdev) { | |
c95b819a | 879 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
880 | mtu = tdev->mtu; |
881 | } | |
882 | dev->iflink = tunnel->parms.link; | |
883 | ||
884 | /* Precalculate GRE options length */ | |
885 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
886 | if (tunnel->parms.o_flags&GRE_CSUM) | |
887 | addend += 4; | |
888 | if (tunnel->parms.o_flags&GRE_KEY) | |
889 | addend += 4; | |
890 | if (tunnel->parms.o_flags&GRE_SEQ) | |
891 | addend += 4; | |
892 | } | |
c95b819a | 893 | dev->needed_headroom = addend + hlen; |
42aa9162 HX |
894 | mtu -= dev->hard_header_len - addend; |
895 | ||
896 | if (mtu < 68) | |
897 | mtu = 68; | |
898 | ||
ee34c1eb MS |
899 | tunnel->hlen = addend; |
900 | ||
42aa9162 | 901 | return mtu; |
ee34c1eb MS |
902 | } |
903 | ||
1da177e4 LT |
904 | static int |
905 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
906 | { | |
907 | int err = 0; | |
908 | struct ip_tunnel_parm p; | |
909 | struct ip_tunnel *t; | |
f57e7d5a PE |
910 | struct net *net = dev_net(dev); |
911 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
912 | |
913 | switch (cmd) { | |
914 | case SIOCGETTUNNEL: | |
915 | t = NULL; | |
7daa0004 | 916 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
917 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
918 | err = -EFAULT; | |
919 | break; | |
920 | } | |
f57e7d5a | 921 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
922 | } |
923 | if (t == NULL) | |
2941a486 | 924 | t = netdev_priv(dev); |
1da177e4 LT |
925 | memcpy(&p, &t->parms, sizeof(p)); |
926 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
927 | err = -EFAULT; | |
928 | break; | |
929 | ||
930 | case SIOCADDTUNNEL: | |
931 | case SIOCCHGTUNNEL: | |
932 | err = -EPERM; | |
933 | if (!capable(CAP_NET_ADMIN)) | |
934 | goto done; | |
935 | ||
936 | err = -EFAULT; | |
937 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
938 | goto done; | |
939 | ||
940 | err = -EINVAL; | |
941 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
942 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
943 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
944 | goto done; | |
945 | if (p.iph.ttl) | |
946 | p.iph.frag_off |= htons(IP_DF); | |
947 | ||
948 | if (!(p.i_flags&GRE_KEY)) | |
949 | p.i_key = 0; | |
950 | if (!(p.o_flags&GRE_KEY)) | |
951 | p.o_key = 0; | |
952 | ||
f57e7d5a | 953 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 954 | |
7daa0004 | 955 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
956 | if (t != NULL) { |
957 | if (t->dev != dev) { | |
958 | err = -EEXIST; | |
959 | break; | |
960 | } | |
961 | } else { | |
962 | unsigned nflags=0; | |
963 | ||
2941a486 | 964 | t = netdev_priv(dev); |
1da177e4 | 965 | |
f97c1e0c | 966 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
967 | nflags = IFF_BROADCAST; |
968 | else if (p.iph.daddr) | |
969 | nflags = IFF_POINTOPOINT; | |
970 | ||
971 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
972 | err = -EINVAL; | |
973 | break; | |
974 | } | |
f57e7d5a | 975 | ipgre_tunnel_unlink(ign, t); |
1da177e4 LT |
976 | t->parms.iph.saddr = p.iph.saddr; |
977 | t->parms.iph.daddr = p.iph.daddr; | |
978 | t->parms.i_key = p.i_key; | |
979 | t->parms.o_key = p.o_key; | |
980 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
981 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 982 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
983 | netdev_state_change(dev); |
984 | } | |
985 | } | |
986 | ||
987 | if (t) { | |
988 | err = 0; | |
989 | if (cmd == SIOCCHGTUNNEL) { | |
990 | t->parms.iph.ttl = p.iph.ttl; | |
991 | t->parms.iph.tos = p.iph.tos; | |
992 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
993 | if (t->parms.link != p.link) { |
994 | t->parms.link = p.link; | |
42aa9162 | 995 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
996 | netdev_state_change(dev); |
997 | } | |
1da177e4 LT |
998 | } |
999 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1000 | err = -EFAULT; | |
1001 | } else | |
1002 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1003 | break; | |
1004 | ||
1005 | case SIOCDELTUNNEL: | |
1006 | err = -EPERM; | |
1007 | if (!capable(CAP_NET_ADMIN)) | |
1008 | goto done; | |
1009 | ||
7daa0004 | 1010 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1011 | err = -EFAULT; |
1012 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1013 | goto done; | |
1014 | err = -ENOENT; | |
f57e7d5a | 1015 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1016 | goto done; |
1017 | err = -EPERM; | |
7daa0004 | 1018 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1019 | goto done; |
1020 | dev = t->dev; | |
1021 | } | |
22f8cde5 SH |
1022 | unregister_netdevice(dev); |
1023 | err = 0; | |
1da177e4 LT |
1024 | break; |
1025 | ||
1026 | default: | |
1027 | err = -EINVAL; | |
1028 | } | |
1029 | ||
1030 | done: | |
1031 | return err; | |
1032 | } | |
1033 | ||
1da177e4 LT |
1034 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1035 | { | |
2941a486 | 1036 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1037 | if (new_mtu < 68 || |
1038 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1039 | return -EINVAL; |
1040 | dev->mtu = new_mtu; | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1da177e4 LT |
1044 | /* Nice toy. Unfortunately, useless in real life :-) |
1045 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1046 | over the Internet, provided multicast routing is tuned. | |
1047 | ||
1048 | ||
1049 | I have no idea was this bicycle invented before me, | |
1050 | so that I had to set ARPHRD_IPGRE to a random value. | |
1051 | I have an impression, that Cisco could make something similar, | |
1052 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1053 | |
1da177e4 LT |
1054 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1055 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1056 | ||
1057 | ping -t 255 224.66.66.66 | |
1058 | ||
1059 | If nobody answers, mbone does not work. | |
1060 | ||
1061 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1062 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1063 | ifconfig Universe up | |
1064 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1065 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1066 | ftp 10.66.66.66 | |
1067 | ... | |
1068 | ftp fec0:6666:6666::193.233.7.65 | |
1069 | ... | |
1070 | ||
1071 | */ | |
1072 | ||
3b04ddde SH |
1073 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1074 | unsigned short type, | |
1075 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 | 1076 | { |
2941a486 | 1077 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1078 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1079 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1080 | |
1081 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1082 | p[0] = t->parms.o_flags; | |
1083 | p[1] = htons(type); | |
1084 | ||
1085 | /* | |
e905a9ed | 1086 | * Set the source hardware address. |
1da177e4 | 1087 | */ |
e905a9ed | 1088 | |
1da177e4 LT |
1089 | if (saddr) |
1090 | memcpy(&iph->saddr, saddr, 4); | |
1091 | ||
1092 | if (daddr) { | |
1093 | memcpy(&iph->daddr, daddr, 4); | |
1094 | return t->hlen; | |
1095 | } | |
f97c1e0c | 1096 | if (iph->daddr && !ipv4_is_multicast(iph->daddr)) |
1da177e4 | 1097 | return t->hlen; |
e905a9ed | 1098 | |
1da177e4 LT |
1099 | return -t->hlen; |
1100 | } | |
1101 | ||
6a5f44d7 TT |
1102 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1103 | { | |
1104 | struct iphdr *iph = (struct iphdr*) skb_mac_header(skb); | |
1105 | memcpy(haddr, &iph->saddr, 4); | |
1106 | return 4; | |
1107 | } | |
1108 | ||
3b04ddde SH |
1109 | static const struct header_ops ipgre_header_ops = { |
1110 | .create = ipgre_header, | |
6a5f44d7 | 1111 | .parse = ipgre_header_parse, |
3b04ddde SH |
1112 | }; |
1113 | ||
6a5f44d7 | 1114 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1115 | static int ipgre_open(struct net_device *dev) |
1116 | { | |
2941a486 | 1117 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1118 | |
f97c1e0c | 1119 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
1da177e4 LT |
1120 | struct flowi fl = { .oif = t->parms.link, |
1121 | .nl_u = { .ip4_u = | |
1122 | { .daddr = t->parms.iph.daddr, | |
1123 | .saddr = t->parms.iph.saddr, | |
1124 | .tos = RT_TOS(t->parms.iph.tos) } }, | |
1125 | .proto = IPPROTO_GRE }; | |
1126 | struct rtable *rt; | |
96635522 | 1127 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
1da177e4 LT |
1128 | return -EADDRNOTAVAIL; |
1129 | dev = rt->u.dst.dev; | |
1130 | ip_rt_put(rt); | |
e5ed6399 | 1131 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1132 | return -EADDRNOTAVAIL; |
1133 | t->mlink = dev->ifindex; | |
e5ed6399 | 1134 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1135 | } |
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | static int ipgre_close(struct net_device *dev) | |
1140 | { | |
2941a486 | 1141 | struct ip_tunnel *t = netdev_priv(dev); |
f97c1e0c | 1142 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1143 | struct in_device *in_dev; |
c346dca1 | 1144 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
1da177e4 LT |
1145 | if (in_dev) { |
1146 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); | |
1147 | in_dev_put(in_dev); | |
1148 | } | |
1149 | } | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | #endif | |
1154 | ||
1155 | static void ipgre_tunnel_setup(struct net_device *dev) | |
1156 | { | |
c19e654d | 1157 | dev->init = ipgre_tunnel_init; |
1da177e4 LT |
1158 | dev->uninit = ipgre_tunnel_uninit; |
1159 | dev->destructor = free_netdev; | |
1160 | dev->hard_start_xmit = ipgre_tunnel_xmit; | |
1da177e4 LT |
1161 | dev->do_ioctl = ipgre_tunnel_ioctl; |
1162 | dev->change_mtu = ipgre_tunnel_change_mtu; | |
1163 | ||
1164 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1165 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1166 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1167 | dev->flags = IFF_NOARP; |
1168 | dev->iflink = 0; | |
1169 | dev->addr_len = 4; | |
0b67eceb | 1170 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1171 | } |
1172 | ||
1173 | static int ipgre_tunnel_init(struct net_device *dev) | |
1174 | { | |
1da177e4 LT |
1175 | struct ip_tunnel *tunnel; |
1176 | struct iphdr *iph; | |
1da177e4 | 1177 | |
2941a486 | 1178 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1179 | iph = &tunnel->parms.iph; |
1180 | ||
1181 | tunnel->dev = dev; | |
1182 | strcpy(tunnel->parms.name, dev->name); | |
1183 | ||
1184 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1185 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1186 | ||
1da177e4 | 1187 | if (iph->daddr) { |
1da177e4 | 1188 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1189 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1190 | if (!iph->saddr) |
1191 | return -EINVAL; | |
1192 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1193 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1194 | dev->open = ipgre_open; |
1195 | dev->stop = ipgre_close; | |
1196 | } | |
1197 | #endif | |
ee34c1eb | 1198 | } else |
6a5f44d7 | 1199 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1200 | |
1da177e4 LT |
1201 | return 0; |
1202 | } | |
1203 | ||
7daa0004 | 1204 | static int ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1205 | { |
2941a486 | 1206 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1207 | struct iphdr *iph = &tunnel->parms.iph; |
eb8ce741 | 1208 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
1da177e4 LT |
1209 | |
1210 | tunnel->dev = dev; | |
1211 | strcpy(tunnel->parms.name, dev->name); | |
1212 | ||
1213 | iph->version = 4; | |
1214 | iph->protocol = IPPROTO_GRE; | |
1215 | iph->ihl = 5; | |
1216 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1217 | ||
1218 | dev_hold(dev); | |
eb8ce741 | 1219 | ign->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1220 | return 0; |
1221 | } | |
1222 | ||
1223 | ||
1224 | static struct net_protocol ipgre_protocol = { | |
1225 | .handler = ipgre_rcv, | |
1226 | .err_handler = ipgre_err, | |
f96c148f | 1227 | .netns_ok = 1, |
1da177e4 LT |
1228 | }; |
1229 | ||
eb8ce741 PE |
1230 | static void ipgre_destroy_tunnels(struct ipgre_net *ign) |
1231 | { | |
1232 | int prio; | |
1233 | ||
1234 | for (prio = 0; prio < 4; prio++) { | |
1235 | int h; | |
1236 | for (h = 0; h < HASH_SIZE; h++) { | |
1237 | struct ip_tunnel *t; | |
1238 | while ((t = ign->tunnels[prio][h]) != NULL) | |
1239 | unregister_netdevice(t->dev); | |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | ||
59a4c759 PE |
1244 | static int ipgre_init_net(struct net *net) |
1245 | { | |
1246 | int err; | |
1247 | struct ipgre_net *ign; | |
1248 | ||
1249 | err = -ENOMEM; | |
eb8ce741 | 1250 | ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL); |
59a4c759 PE |
1251 | if (ign == NULL) |
1252 | goto err_alloc; | |
1253 | ||
1254 | err = net_assign_generic(net, ipgre_net_id, ign); | |
1255 | if (err < 0) | |
1256 | goto err_assign; | |
1257 | ||
7daa0004 PE |
1258 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1259 | ipgre_tunnel_setup); | |
1260 | if (!ign->fb_tunnel_dev) { | |
1261 | err = -ENOMEM; | |
1262 | goto err_alloc_dev; | |
1263 | } | |
1264 | ||
1265 | ign->fb_tunnel_dev->init = ipgre_fb_tunnel_init; | |
1266 | dev_net_set(ign->fb_tunnel_dev, net); | |
c19e654d | 1267 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1268 | |
1269 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1270 | goto err_reg_dev; | |
1271 | ||
59a4c759 PE |
1272 | return 0; |
1273 | ||
7daa0004 PE |
1274 | err_reg_dev: |
1275 | free_netdev(ign->fb_tunnel_dev); | |
1276 | err_alloc_dev: | |
1277 | /* nothing */ | |
59a4c759 PE |
1278 | err_assign: |
1279 | kfree(ign); | |
1280 | err_alloc: | |
1281 | return err; | |
1282 | } | |
1283 | ||
1284 | static void ipgre_exit_net(struct net *net) | |
1285 | { | |
1286 | struct ipgre_net *ign; | |
1287 | ||
1288 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1289 | rtnl_lock(); |
eb8ce741 | 1290 | ipgre_destroy_tunnels(ign); |
7daa0004 | 1291 | rtnl_unlock(); |
59a4c759 PE |
1292 | kfree(ign); |
1293 | } | |
1294 | ||
1295 | static struct pernet_operations ipgre_net_ops = { | |
1296 | .init = ipgre_init_net, | |
1297 | .exit = ipgre_exit_net, | |
1298 | }; | |
1da177e4 | 1299 | |
c19e654d HX |
1300 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1301 | { | |
1302 | __be16 flags; | |
1303 | ||
1304 | if (!data) | |
1305 | return 0; | |
1306 | ||
1307 | flags = 0; | |
1308 | if (data[IFLA_GRE_IFLAGS]) | |
1309 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1310 | if (data[IFLA_GRE_OFLAGS]) | |
1311 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1312 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1313 | return -EINVAL; | |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
e1a80002 HX |
1318 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1319 | { | |
1320 | __be32 daddr; | |
1321 | ||
1322 | if (tb[IFLA_ADDRESS]) { | |
1323 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1324 | return -EINVAL; | |
1325 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1326 | return -EADDRNOTAVAIL; | |
1327 | } | |
1328 | ||
1329 | if (!data) | |
1330 | goto out; | |
1331 | ||
1332 | if (data[IFLA_GRE_REMOTE]) { | |
1333 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1334 | if (!daddr) | |
1335 | return -EINVAL; | |
1336 | } | |
1337 | ||
1338 | out: | |
1339 | return ipgre_tunnel_validate(tb, data); | |
1340 | } | |
1341 | ||
c19e654d HX |
1342 | static void ipgre_netlink_parms(struct nlattr *data[], |
1343 | struct ip_tunnel_parm *parms) | |
1344 | { | |
1345 | memset(parms, 0, sizeof(parms)); | |
1346 | ||
1347 | parms->iph.protocol = IPPROTO_GRE; | |
1348 | ||
1349 | if (!data) | |
1350 | return; | |
1351 | ||
1352 | if (data[IFLA_GRE_LINK]) | |
1353 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1354 | ||
1355 | if (data[IFLA_GRE_IFLAGS]) | |
1356 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1357 | ||
1358 | if (data[IFLA_GRE_OFLAGS]) | |
1359 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1360 | ||
1361 | if (data[IFLA_GRE_IKEY]) | |
1362 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1363 | ||
1364 | if (data[IFLA_GRE_OKEY]) | |
1365 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1366 | ||
1367 | if (data[IFLA_GRE_LOCAL]) | |
1368 | memcpy(&parms->iph.saddr, nla_data(data[IFLA_GRE_LOCAL]), 4); | |
1369 | ||
1370 | if (data[IFLA_GRE_REMOTE]) | |
1371 | memcpy(&parms->iph.daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1372 | ||
1373 | if (data[IFLA_GRE_TTL]) | |
1374 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1375 | ||
1376 | if (data[IFLA_GRE_TOS]) | |
1377 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1378 | ||
1379 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1380 | parms->iph.frag_off = htons(IP_DF); | |
1381 | } | |
1382 | ||
e1a80002 HX |
1383 | static int ipgre_tap_init(struct net_device *dev) |
1384 | { | |
1385 | struct ip_tunnel *tunnel; | |
1386 | ||
1387 | tunnel = netdev_priv(dev); | |
1388 | ||
1389 | tunnel->dev = dev; | |
1390 | strcpy(tunnel->parms.name, dev->name); | |
1391 | ||
1392 | ipgre_tunnel_bind_dev(dev); | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | static void ipgre_tap_setup(struct net_device *dev) | |
1398 | { | |
1399 | ||
1400 | ether_setup(dev); | |
1401 | ||
1402 | dev->init = ipgre_tap_init; | |
1403 | dev->uninit = ipgre_tunnel_uninit; | |
1404 | dev->destructor = free_netdev; | |
1405 | dev->hard_start_xmit = ipgre_tunnel_xmit; | |
1406 | dev->change_mtu = ipgre_tunnel_change_mtu; | |
1407 | ||
1408 | dev->iflink = 0; | |
1409 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1410 | } | |
1411 | ||
c19e654d HX |
1412 | static int ipgre_newlink(struct net_device *dev, struct nlattr *tb[], |
1413 | struct nlattr *data[]) | |
1414 | { | |
1415 | struct ip_tunnel *nt; | |
1416 | struct net *net = dev_net(dev); | |
1417 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1418 | int mtu; | |
1419 | int err; | |
1420 | ||
1421 | nt = netdev_priv(dev); | |
1422 | ipgre_netlink_parms(data, &nt->parms); | |
1423 | ||
e1a80002 | 1424 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1425 | return -EEXIST; |
1426 | ||
e1a80002 HX |
1427 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1428 | random_ether_addr(dev->dev_addr); | |
1429 | ||
c19e654d HX |
1430 | mtu = ipgre_tunnel_bind_dev(dev); |
1431 | if (!tb[IFLA_MTU]) | |
1432 | dev->mtu = mtu; | |
1433 | ||
1434 | err = register_netdevice(dev); | |
1435 | if (err) | |
1436 | goto out; | |
1437 | ||
1438 | dev_hold(dev); | |
1439 | ipgre_tunnel_link(ign, nt); | |
1440 | ||
1441 | out: | |
1442 | return err; | |
1443 | } | |
1444 | ||
1445 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1446 | struct nlattr *data[]) | |
1447 | { | |
1448 | struct ip_tunnel *t, *nt; | |
1449 | struct net *net = dev_net(dev); | |
1450 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1451 | struct ip_tunnel_parm p; | |
1452 | int mtu; | |
1453 | ||
1454 | if (dev == ign->fb_tunnel_dev) | |
1455 | return -EINVAL; | |
1456 | ||
1457 | nt = netdev_priv(dev); | |
1458 | ipgre_netlink_parms(data, &p); | |
1459 | ||
1460 | t = ipgre_tunnel_locate(net, &p, 0); | |
1461 | ||
1462 | if (t) { | |
1463 | if (t->dev != dev) | |
1464 | return -EEXIST; | |
1465 | } else { | |
1466 | unsigned nflags = 0; | |
1467 | ||
1468 | t = nt; | |
1469 | ||
1470 | if (ipv4_is_multicast(p.iph.daddr)) | |
1471 | nflags = IFF_BROADCAST; | |
1472 | else if (p.iph.daddr) | |
1473 | nflags = IFF_POINTOPOINT; | |
1474 | ||
1475 | if ((dev->flags ^ nflags) & | |
1476 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1477 | return -EINVAL; | |
1478 | ||
1479 | ipgre_tunnel_unlink(ign, t); | |
1480 | t->parms.iph.saddr = p.iph.saddr; | |
1481 | t->parms.iph.daddr = p.iph.daddr; | |
1482 | t->parms.i_key = p.i_key; | |
1483 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1484 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1485 | ipgre_tunnel_link(ign, t); | |
1486 | netdev_state_change(dev); | |
1487 | } | |
1488 | ||
1489 | t->parms.o_key = p.o_key; | |
1490 | t->parms.iph.ttl = p.iph.ttl; | |
1491 | t->parms.iph.tos = p.iph.tos; | |
1492 | t->parms.iph.frag_off = p.iph.frag_off; | |
1493 | ||
1494 | if (t->parms.link != p.link) { | |
1495 | t->parms.link = p.link; | |
1496 | mtu = ipgre_tunnel_bind_dev(dev); | |
1497 | if (!tb[IFLA_MTU]) | |
1498 | dev->mtu = mtu; | |
1499 | netdev_state_change(dev); | |
1500 | } | |
1501 | ||
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | static size_t ipgre_get_size(const struct net_device *dev) | |
1506 | { | |
1507 | return | |
1508 | /* IFLA_GRE_LINK */ | |
1509 | nla_total_size(4) + | |
1510 | /* IFLA_GRE_IFLAGS */ | |
1511 | nla_total_size(2) + | |
1512 | /* IFLA_GRE_OFLAGS */ | |
1513 | nla_total_size(2) + | |
1514 | /* IFLA_GRE_IKEY */ | |
1515 | nla_total_size(4) + | |
1516 | /* IFLA_GRE_OKEY */ | |
1517 | nla_total_size(4) + | |
1518 | /* IFLA_GRE_LOCAL */ | |
1519 | nla_total_size(4) + | |
1520 | /* IFLA_GRE_REMOTE */ | |
1521 | nla_total_size(4) + | |
1522 | /* IFLA_GRE_TTL */ | |
1523 | nla_total_size(1) + | |
1524 | /* IFLA_GRE_TOS */ | |
1525 | nla_total_size(1) + | |
1526 | /* IFLA_GRE_PMTUDISC */ | |
1527 | nla_total_size(1) + | |
1528 | 0; | |
1529 | } | |
1530 | ||
1531 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1532 | { | |
1533 | struct ip_tunnel *t = netdev_priv(dev); | |
1534 | struct ip_tunnel_parm *p = &t->parms; | |
1535 | ||
1536 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1537 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1538 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
1539 | NLA_PUT_BE32(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1540 | NLA_PUT_BE32(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
1541 | NLA_PUT(skb, IFLA_GRE_LOCAL, 4, &p->iph.saddr); | |
1542 | NLA_PUT(skb, IFLA_GRE_REMOTE, 4, &p->iph.daddr); | |
1543 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); | |
1544 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1545 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1546 | ||
1547 | return 0; | |
1548 | ||
1549 | nla_put_failure: | |
1550 | return -EMSGSIZE; | |
1551 | } | |
1552 | ||
1553 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1554 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1555 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1556 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1557 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1558 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
1559 | [IFLA_GRE_LOCAL] = { .len = 4 }, | |
1560 | [IFLA_GRE_REMOTE] = { .len = 4 }, | |
1561 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, | |
1562 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1563 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1564 | }; | |
1565 | ||
1566 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1567 | .kind = "gre", | |
1568 | .maxtype = IFLA_GRE_MAX, | |
1569 | .policy = ipgre_policy, | |
1570 | .priv_size = sizeof(struct ip_tunnel), | |
1571 | .setup = ipgre_tunnel_setup, | |
1572 | .validate = ipgre_tunnel_validate, | |
1573 | .newlink = ipgre_newlink, | |
1574 | .changelink = ipgre_changelink, | |
1575 | .get_size = ipgre_get_size, | |
1576 | .fill_info = ipgre_fill_info, | |
1577 | }; | |
1578 | ||
e1a80002 HX |
1579 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1580 | .kind = "gretap", | |
1581 | .maxtype = IFLA_GRE_MAX, | |
1582 | .policy = ipgre_policy, | |
1583 | .priv_size = sizeof(struct ip_tunnel), | |
1584 | .setup = ipgre_tap_setup, | |
1585 | .validate = ipgre_tap_validate, | |
1586 | .newlink = ipgre_newlink, | |
1587 | .changelink = ipgre_changelink, | |
1588 | .get_size = ipgre_get_size, | |
1589 | .fill_info = ipgre_fill_info, | |
1590 | }; | |
1591 | ||
1da177e4 LT |
1592 | /* |
1593 | * And now the modules code and kernel interface. | |
1594 | */ | |
1595 | ||
1596 | static int __init ipgre_init(void) | |
1597 | { | |
1598 | int err; | |
1599 | ||
1600 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1601 | ||
1602 | if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) { | |
1603 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1604 | return -EAGAIN; | |
1605 | } | |
1606 | ||
59a4c759 PE |
1607 | err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops); |
1608 | if (err < 0) | |
c19e654d | 1609 | goto gen_device_failed; |
7daa0004 | 1610 | |
c19e654d HX |
1611 | err = rtnl_link_register(&ipgre_link_ops); |
1612 | if (err < 0) | |
1613 | goto rtnl_link_failed; | |
1614 | ||
e1a80002 HX |
1615 | err = rtnl_link_register(&ipgre_tap_ops); |
1616 | if (err < 0) | |
1617 | goto tap_ops_failed; | |
1618 | ||
c19e654d | 1619 | out: |
1da177e4 | 1620 | return err; |
c19e654d | 1621 | |
e1a80002 HX |
1622 | tap_ops_failed: |
1623 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d HX |
1624 | rtnl_link_failed: |
1625 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1626 | gen_device_failed: | |
1627 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); | |
1628 | goto out; | |
1da177e4 LT |
1629 | } |
1630 | ||
db44575f | 1631 | static void __exit ipgre_fini(void) |
1da177e4 | 1632 | { |
e1a80002 | 1633 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d HX |
1634 | rtnl_link_unregister(&ipgre_link_ops); |
1635 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1da177e4 LT |
1636 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
1637 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); | |
1da177e4 LT |
1638 | } |
1639 | ||
1640 | module_init(ipgre_init); | |
1641 | module_exit(ipgre_fini); | |
1642 | MODULE_LICENSE("GPL"); | |
c19e654d | 1643 | MODULE_ALIAS("rtnl-link-gre"); |
e1a80002 | 1644 | MODULE_ALIAS("rtnl-link-gretap"); |