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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 LT |
8 | * |
9 | * $Id$ | |
10 | * | |
11 | * Based on: | |
c4d3efaf | 12 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
13 | * |
14 | * RFC 2473 | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | */ | |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/if_tunnel.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/in6.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/if_arp.h> | |
37 | #include <linux/icmpv6.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/route.h> | |
40 | #include <linux/rtnetlink.h> | |
41 | #include <linux/netfilter_ipv6.h> | |
42 | ||
43 | #include <asm/uaccess.h> | |
44 | #include <asm/atomic.h> | |
45 | ||
c4d3efaf | 46 | #include <net/icmp.h> |
1da177e4 LT |
47 | #include <net/ip.h> |
48 | #include <net/ipv6.h> | |
1da177e4 LT |
49 | #include <net/ip6_route.h> |
50 | #include <net/addrconf.h> | |
51 | #include <net/ip6_tunnel.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/dsfield.h> | |
54 | #include <net/inet_ecn.h> | |
55 | ||
56 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 57 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 LT |
58 | MODULE_LICENSE("GPL"); |
59 | ||
60 | #define IPV6_TLV_TEL_DST_SIZE 8 | |
61 | ||
62 | #ifdef IP6_TNL_DEBUG | |
63 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __FUNCTION__) | |
64 | #else | |
65 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
66 | #endif | |
67 | ||
68 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 69 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
70 | |
71 | #define HASH_SIZE 32 | |
72 | ||
e69a4adc | 73 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
74 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
75 | (HASH_SIZE - 1)) | |
1da177e4 | 76 | |
3144581c YK |
77 | static int ip6_fb_tnl_dev_init(struct net_device *dev); |
78 | static int ip6_tnl_dev_init(struct net_device *dev); | |
79 | static void ip6_tnl_dev_setup(struct net_device *dev); | |
1da177e4 LT |
80 | |
81 | /* the IPv6 tunnel fallback device */ | |
3144581c | 82 | static struct net_device *ip6_fb_tnl_dev; |
1da177e4 LT |
83 | |
84 | ||
85 | /* lists for storing tunnels in use */ | |
86 | static struct ip6_tnl *tnls_r_l[HASH_SIZE]; | |
87 | static struct ip6_tnl *tnls_wc[1]; | |
88 | static struct ip6_tnl **tnls[2] = { tnls_wc, tnls_r_l }; | |
89 | ||
90 | /* lock for the tunnel lists */ | |
3144581c | 91 | static DEFINE_RWLOCK(ip6_tnl_lock); |
1da177e4 LT |
92 | |
93 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
94 | { | |
95 | struct dst_entry *dst = t->dst_cache; | |
96 | ||
1ab1457c | 97 | if (dst && dst->obsolete && |
1da177e4 LT |
98 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
99 | t->dst_cache = NULL; | |
100 | dst_release(dst); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | return dst; | |
105 | } | |
106 | ||
107 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
108 | { | |
109 | dst_release(t->dst_cache); | |
110 | t->dst_cache = NULL; | |
111 | } | |
112 | ||
113 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
114 | { | |
115 | struct rt6_info *rt = (struct rt6_info *) dst; | |
116 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
117 | dst_release(t->dst_cache); | |
118 | t->dst_cache = dst; | |
119 | } | |
120 | ||
121 | /** | |
3144581c | 122 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
123 | * @remote: the address of the tunnel exit-point |
124 | * @local: the address of the tunnel entry-point | |
1da177e4 | 125 | * |
1ab1457c | 126 | * Return: |
1da177e4 | 127 | * tunnel matching given end-points if found, |
1ab1457c | 128 | * else fallback tunnel if its device is up, |
1da177e4 LT |
129 | * else %NULL |
130 | **/ | |
131 | ||
132 | static struct ip6_tnl * | |
3144581c | 133 | ip6_tnl_lookup(struct in6_addr *remote, struct in6_addr *local) |
1da177e4 LT |
134 | { |
135 | unsigned h0 = HASH(remote); | |
136 | unsigned h1 = HASH(local); | |
137 | struct ip6_tnl *t; | |
138 | ||
139 | for (t = tnls_r_l[h0 ^ h1]; t; t = t->next) { | |
140 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
141 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
142 | (t->dev->flags & IFF_UP)) | |
143 | return t; | |
144 | } | |
145 | if ((t = tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) | |
146 | return t; | |
147 | ||
148 | return NULL; | |
149 | } | |
150 | ||
151 | /** | |
3144581c | 152 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 153 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
154 | * |
155 | * Description: | |
3144581c | 156 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
157 | * &struct in6_addr entries laddr and raddr in @p. |
158 | * | |
1ab1457c | 159 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
160 | **/ |
161 | ||
162 | static struct ip6_tnl ** | |
3144581c | 163 | ip6_tnl_bucket(struct ip6_tnl_parm *p) |
1da177e4 LT |
164 | { |
165 | struct in6_addr *remote = &p->raddr; | |
166 | struct in6_addr *local = &p->laddr; | |
167 | unsigned h = 0; | |
168 | int prio = 0; | |
169 | ||
170 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
171 | prio = 1; | |
172 | h = HASH(remote) ^ HASH(local); | |
173 | } | |
174 | return &tnls[prio][h]; | |
175 | } | |
176 | ||
177 | /** | |
3144581c | 178 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
179 | * @t: tunnel to be added |
180 | **/ | |
181 | ||
182 | static void | |
3144581c | 183 | ip6_tnl_link(struct ip6_tnl *t) |
1da177e4 | 184 | { |
3144581c | 185 | struct ip6_tnl **tp = ip6_tnl_bucket(&t->parms); |
1da177e4 LT |
186 | |
187 | t->next = *tp; | |
3144581c | 188 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 189 | *tp = t; |
3144581c | 190 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
191 | } |
192 | ||
193 | /** | |
3144581c | 194 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
195 | * @t: tunnel to be removed |
196 | **/ | |
197 | ||
198 | static void | |
3144581c | 199 | ip6_tnl_unlink(struct ip6_tnl *t) |
1da177e4 LT |
200 | { |
201 | struct ip6_tnl **tp; | |
202 | ||
3144581c | 203 | for (tp = ip6_tnl_bucket(&t->parms); *tp; tp = &(*tp)->next) { |
1da177e4 | 204 | if (t == *tp) { |
3144581c | 205 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 206 | *tp = t->next; |
3144581c | 207 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
208 | break; |
209 | } | |
210 | } | |
211 | } | |
212 | ||
213 | /** | |
214 | * ip6_tnl_create() - create a new tunnel | |
215 | * @p: tunnel parameters | |
216 | * @pt: pointer to new tunnel | |
217 | * | |
218 | * Description: | |
219 | * Create tunnel matching given parameters. | |
1ab1457c YH |
220 | * |
221 | * Return: | |
567131a7 | 222 | * created tunnel or NULL |
1da177e4 LT |
223 | **/ |
224 | ||
567131a7 | 225 | static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p) |
1da177e4 LT |
226 | { |
227 | struct net_device *dev; | |
228 | struct ip6_tnl *t; | |
229 | char name[IFNAMSIZ]; | |
230 | int err; | |
231 | ||
34cc7ba6 | 232 | if (p->name[0]) |
1da177e4 | 233 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
234 | else |
235 | sprintf(name, "ip6tnl%%d"); | |
236 | ||
3144581c | 237 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 238 | if (dev == NULL) |
567131a7 | 239 | goto failed; |
1da177e4 | 240 | |
2941a486 | 241 | t = netdev_priv(dev); |
3144581c | 242 | dev->init = ip6_tnl_dev_init; |
1da177e4 LT |
243 | t->parms = *p; |
244 | ||
245 | if ((err = register_netdevice(dev)) < 0) { | |
246 | free_netdev(dev); | |
567131a7 | 247 | goto failed; |
1da177e4 LT |
248 | } |
249 | dev_hold(dev); | |
3144581c | 250 | ip6_tnl_link(t); |
567131a7 VN |
251 | return t; |
252 | failed: | |
253 | return NULL; | |
1da177e4 LT |
254 | } |
255 | ||
256 | /** | |
3144581c | 257 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 258 | * @p: tunnel parameters |
1da177e4 LT |
259 | * @create: != 0 if allowed to create new tunnel if no match found |
260 | * | |
261 | * Description: | |
3144581c | 262 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
263 | * based on @parms. If this is unsuccessful, but @create is set a new |
264 | * tunnel device is created and registered for use. | |
265 | * | |
266 | * Return: | |
567131a7 | 267 | * matching tunnel or NULL |
1da177e4 LT |
268 | **/ |
269 | ||
3144581c | 270 | static struct ip6_tnl *ip6_tnl_locate(struct ip6_tnl_parm *p, int create) |
1da177e4 LT |
271 | { |
272 | struct in6_addr *remote = &p->raddr; | |
273 | struct in6_addr *local = &p->laddr; | |
274 | struct ip6_tnl *t; | |
275 | ||
3144581c | 276 | for (t = *ip6_tnl_bucket(p); t; t = t->next) { |
1da177e4 | 277 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
278 | ipv6_addr_equal(remote, &t->parms.raddr)) |
279 | return t; | |
1da177e4 LT |
280 | } |
281 | if (!create) | |
567131a7 VN |
282 | return NULL; |
283 | return ip6_tnl_create(p); | |
1da177e4 LT |
284 | } |
285 | ||
286 | /** | |
3144581c | 287 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 288 | * @dev: the device to be destroyed |
1ab1457c | 289 | * |
1da177e4 | 290 | * Description: |
3144581c | 291 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
292 | **/ |
293 | ||
294 | static void | |
3144581c | 295 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 296 | { |
2941a486 | 297 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 | 298 | |
3144581c YK |
299 | if (dev == ip6_fb_tnl_dev) { |
300 | write_lock_bh(&ip6_tnl_lock); | |
1da177e4 | 301 | tnls_wc[0] = NULL; |
3144581c | 302 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 | 303 | } else { |
3144581c | 304 | ip6_tnl_unlink(t); |
1da177e4 LT |
305 | } |
306 | ip6_tnl_dst_reset(t); | |
307 | dev_put(dev); | |
308 | } | |
309 | ||
310 | /** | |
311 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
312 | * @skb: received socket buffer | |
313 | * | |
1ab1457c YH |
314 | * Return: |
315 | * 0 if none was found, | |
1da177e4 LT |
316 | * else index to encapsulation limit |
317 | **/ | |
318 | ||
319 | static __u16 | |
320 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
321 | { | |
322 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
323 | __u8 nexthdr = ipv6h->nexthdr; | |
324 | __u16 off = sizeof (*ipv6h); | |
325 | ||
326 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
327 | __u16 optlen = 0; | |
328 | struct ipv6_opt_hdr *hdr; | |
329 | if (raw + off + sizeof (*hdr) > skb->data && | |
330 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
331 | break; | |
332 | ||
333 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
334 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
335 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
336 | if (frag_hdr->frag_off) | |
337 | break; | |
338 | optlen = 8; | |
339 | } else if (nexthdr == NEXTHDR_AUTH) { | |
340 | optlen = (hdr->hdrlen + 2) << 2; | |
341 | } else { | |
342 | optlen = ipv6_optlen(hdr); | |
343 | } | |
344 | if (nexthdr == NEXTHDR_DEST) { | |
345 | __u16 i = off + 2; | |
346 | while (1) { | |
347 | struct ipv6_tlv_tnl_enc_lim *tel; | |
348 | ||
349 | /* No more room for encapsulation limit */ | |
350 | if (i + sizeof (*tel) > off + optlen) | |
351 | break; | |
352 | ||
353 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
354 | /* return index of option if found and valid */ | |
355 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
356 | tel->length == 1) | |
357 | return i; | |
358 | /* else jump to next option */ | |
359 | if (tel->type) | |
360 | i += tel->length + 2; | |
361 | else | |
362 | i++; | |
363 | } | |
364 | } | |
365 | nexthdr = hdr->nexthdr; | |
366 | off += optlen; | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
371 | /** | |
e490d1d8 | 372 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
373 | * |
374 | * Description: | |
e490d1d8 | 375 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
376 | * to the specifications in RFC 2473. |
377 | **/ | |
378 | ||
d2acc347 | 379 | static int |
502b0935 | 380 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
704eae1f | 381 | int *type, int *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
382 | { |
383 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
384 | struct ip6_tnl *t; | |
385 | int rel_msg = 0; | |
386 | int rel_type = ICMPV6_DEST_UNREACH; | |
387 | int rel_code = ICMPV6_ADDR_UNREACH; | |
388 | __u32 rel_info = 0; | |
389 | __u16 len; | |
d2acc347 | 390 | int err = -ENOENT; |
1da177e4 | 391 | |
1ab1457c YH |
392 | /* If the packet doesn't contain the original IPv6 header we are |
393 | in trouble since we might need the source address for further | |
1da177e4 LT |
394 | processing of the error. */ |
395 | ||
3144581c YK |
396 | read_lock(&ip6_tnl_lock); |
397 | if ((t = ip6_tnl_lookup(&ipv6h->daddr, &ipv6h->saddr)) == NULL) | |
1da177e4 LT |
398 | goto out; |
399 | ||
502b0935 YK |
400 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
401 | goto out; | |
402 | ||
d2acc347 HX |
403 | err = 0; |
404 | ||
e490d1d8 | 405 | switch (*type) { |
1da177e4 LT |
406 | __u32 teli; |
407 | struct ipv6_tlv_tnl_enc_lim *tel; | |
408 | __u32 mtu; | |
409 | case ICMPV6_DEST_UNREACH: | |
410 | if (net_ratelimit()) | |
411 | printk(KERN_WARNING | |
412 | "%s: Path to destination invalid " | |
413 | "or inactive!\n", t->parms.name); | |
414 | rel_msg = 1; | |
415 | break; | |
416 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 417 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
418 | if (net_ratelimit()) |
419 | printk(KERN_WARNING | |
420 | "%s: Too small hop limit or " | |
1ab1457c | 421 | "routing loop in tunnel!\n", |
1da177e4 LT |
422 | t->parms.name); |
423 | rel_msg = 1; | |
424 | } | |
425 | break; | |
426 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 427 | teli = 0; |
e490d1d8 | 428 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 429 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 430 | |
704eae1f | 431 | if (teli && teli == *info - 2) { |
1da177e4 LT |
432 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
433 | if (tel->encap_limit == 0) { | |
434 | if (net_ratelimit()) | |
435 | printk(KERN_WARNING | |
436 | "%s: Too small encapsulation " | |
437 | "limit or routing loop in " | |
438 | "tunnel!\n", t->parms.name); | |
439 | rel_msg = 1; | |
440 | } | |
107a5fe6 VN |
441 | } else if (net_ratelimit()) { |
442 | printk(KERN_WARNING | |
443 | "%s: Recipient unable to parse tunneled " | |
444 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
445 | } |
446 | break; | |
447 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 448 | mtu = *info - offset; |
1da177e4 LT |
449 | if (mtu < IPV6_MIN_MTU) |
450 | mtu = IPV6_MIN_MTU; | |
451 | t->dev->mtu = mtu; | |
452 | ||
cc6cdac0 | 453 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
454 | rel_type = ICMPV6_PKT_TOOBIG; |
455 | rel_code = 0; | |
456 | rel_info = mtu; | |
457 | rel_msg = 1; | |
458 | } | |
459 | break; | |
460 | } | |
e490d1d8 YK |
461 | |
462 | *type = rel_type; | |
463 | *code = rel_code; | |
464 | *info = rel_info; | |
465 | *msg = rel_msg; | |
466 | ||
467 | out: | |
3144581c | 468 | read_unlock(&ip6_tnl_lock); |
e490d1d8 YK |
469 | return err; |
470 | } | |
471 | ||
c4d3efaf YK |
472 | static int |
473 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
704eae1f | 474 | int type, int code, int offset, __be32 info) |
c4d3efaf YK |
475 | { |
476 | int rel_msg = 0; | |
477 | int rel_type = type; | |
478 | int rel_code = code; | |
704eae1f | 479 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
480 | int err; |
481 | struct sk_buff *skb2; | |
482 | struct iphdr *eiph; | |
483 | struct flowi fl; | |
484 | struct rtable *rt; | |
485 | ||
502b0935 YK |
486 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
487 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
488 | if (err < 0) |
489 | return err; | |
490 | ||
491 | if (rel_msg == 0) | |
492 | return 0; | |
493 | ||
494 | switch (rel_type) { | |
495 | case ICMPV6_DEST_UNREACH: | |
496 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
497 | return 0; | |
498 | rel_type = ICMP_DEST_UNREACH; | |
499 | rel_code = ICMP_HOST_UNREACH; | |
500 | break; | |
501 | case ICMPV6_PKT_TOOBIG: | |
502 | if (rel_code != 0) | |
503 | return 0; | |
504 | rel_type = ICMP_DEST_UNREACH; | |
505 | rel_code = ICMP_FRAG_NEEDED; | |
506 | break; | |
507 | default: | |
508 | return 0; | |
509 | } | |
510 | ||
511 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
512 | return 0; | |
513 | ||
514 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
515 | if (!skb2) | |
516 | return 0; | |
517 | ||
518 | dst_release(skb2->dst); | |
519 | skb2->dst = NULL; | |
520 | skb_pull(skb2, offset); | |
c1d2bbe1 | 521 | skb_reset_network_header(skb2); |
eddc9ec5 | 522 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
523 | |
524 | /* Try to guess incoming interface */ | |
525 | memset(&fl, 0, sizeof(fl)); | |
526 | fl.fl4_dst = eiph->saddr; | |
527 | fl.fl4_tos = RT_TOS(eiph->tos); | |
528 | fl.proto = IPPROTO_IPIP; | |
f206351a | 529 | if (ip_route_output_key(&init_net, &rt, &fl)) |
c4d3efaf YK |
530 | goto out; |
531 | ||
532 | skb2->dev = rt->u.dst.dev; | |
533 | ||
534 | /* route "incoming" packet */ | |
535 | if (rt->rt_flags & RTCF_LOCAL) { | |
536 | ip_rt_put(rt); | |
537 | rt = NULL; | |
538 | fl.fl4_dst = eiph->daddr; | |
539 | fl.fl4_src = eiph->saddr; | |
540 | fl.fl4_tos = eiph->tos; | |
f206351a | 541 | if (ip_route_output_key(&init_net, &rt, &fl) || |
c4d3efaf YK |
542 | rt->u.dst.dev->type != ARPHRD_TUNNEL) { |
543 | ip_rt_put(rt); | |
544 | goto out; | |
545 | } | |
9937ded8 | 546 | skb2->dst = (struct dst_entry *)rt; |
c4d3efaf YK |
547 | } else { |
548 | ip_rt_put(rt); | |
549 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
550 | skb2->dev) || | |
551 | skb2->dst->dev->type != ARPHRD_TUNNEL) | |
552 | goto out; | |
553 | } | |
554 | ||
555 | /* change mtu on this route */ | |
556 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
557 | if (rel_info > dst_mtu(skb2->dst)) | |
558 | goto out; | |
559 | ||
560 | skb2->dst->ops->update_pmtu(skb2->dst, rel_info); | |
c4d3efaf YK |
561 | } |
562 | ||
704eae1f | 563 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
564 | |
565 | out: | |
566 | kfree_skb(skb2); | |
567 | return 0; | |
568 | } | |
569 | ||
e490d1d8 YK |
570 | static int |
571 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
704eae1f | 572 | int type, int code, int offset, __be32 info) |
e490d1d8 YK |
573 | { |
574 | int rel_msg = 0; | |
575 | int rel_type = type; | |
576 | int rel_code = code; | |
704eae1f | 577 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
578 | int err; |
579 | ||
502b0935 YK |
580 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
581 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
582 | if (err < 0) |
583 | return err; | |
584 | ||
585 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
586 | struct rt6_info *rt; |
587 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 588 | |
1da177e4 | 589 | if (!skb2) |
e490d1d8 | 590 | return 0; |
1da177e4 LT |
591 | |
592 | dst_release(skb2->dst); | |
593 | skb2->dst = NULL; | |
594 | skb_pull(skb2, offset); | |
c1d2bbe1 | 595 | skb_reset_network_header(skb2); |
1da177e4 LT |
596 | |
597 | /* Try to guess incoming interface */ | |
0660e03f | 598 | rt = rt6_lookup(&ipv6_hdr(skb2)->saddr, NULL, 0, 0); |
1da177e4 LT |
599 | |
600 | if (rt && rt->rt6i_dev) | |
601 | skb2->dev = rt->rt6i_dev; | |
602 | ||
603 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
604 | ||
605 | if (rt) | |
606 | dst_release(&rt->u.dst); | |
607 | ||
608 | kfree_skb(skb2); | |
609 | } | |
e490d1d8 YK |
610 | |
611 | return 0; | |
1da177e4 LT |
612 | } |
613 | ||
c4d3efaf YK |
614 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
615 | struct ipv6hdr *ipv6h, | |
616 | struct sk_buff *skb) | |
617 | { | |
618 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
619 | ||
620 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 621 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
622 | |
623 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 624 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
625 | } |
626 | ||
8359925b YK |
627 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
628 | struct ipv6hdr *ipv6h, | |
629 | struct sk_buff *skb) | |
1da177e4 | 630 | { |
8359925b | 631 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 632 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 633 | |
8359925b | 634 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 635 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 636 | } |
8359925b | 637 | |
09c6bbf0 VN |
638 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
639 | { | |
640 | struct ip6_tnl_parm *p = &t->parms; | |
641 | int ret = 0; | |
642 | ||
643 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 644 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
645 | |
646 | if (p->link) | |
881d966b | 647 | ldev = dev_get_by_index(&init_net, p->link); |
09c6bbf0 VN |
648 | |
649 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
bfeade08 DL |
650 | likely(ipv6_chk_addr(&init_net, &p->laddr, ldev, 0))) && |
651 | likely(!ipv6_chk_addr(&init_net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
652 | ret = 1; |
653 | ||
654 | if (ldev) | |
655 | dev_put(ldev); | |
656 | } | |
657 | return ret; | |
658 | } | |
1da177e4 LT |
659 | |
660 | /** | |
3144581c | 661 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 662 | * @skb: received socket buffer |
8359925b YK |
663 | * @protocol: ethernet protocol ID |
664 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
665 | * |
666 | * Return: 0 | |
667 | **/ | |
668 | ||
8359925b | 669 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 670 | __u8 ipproto, |
8359925b YK |
671 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
672 | struct ipv6hdr *ipv6h, | |
673 | struct sk_buff *skb)) | |
1da177e4 | 674 | { |
1da177e4 | 675 | struct ip6_tnl *t; |
0660e03f | 676 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 677 | |
3144581c | 678 | read_lock(&ip6_tnl_lock); |
1da177e4 | 679 | |
3144581c | 680 | if ((t = ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) { |
502b0935 YK |
681 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
682 | read_unlock(&ip6_tnl_lock); | |
683 | goto discard; | |
684 | } | |
685 | ||
1da177e4 | 686 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
3144581c | 687 | read_unlock(&ip6_tnl_lock); |
50fba2aa | 688 | goto discard; |
1da177e4 LT |
689 | } |
690 | ||
09c6bbf0 | 691 | if (!ip6_tnl_rcv_ctl(t)) { |
1da177e4 | 692 | t->stat.rx_dropped++; |
3144581c | 693 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
694 | goto discard; |
695 | } | |
696 | secpath_reset(skb); | |
b0e380b1 | 697 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 698 | skb_reset_network_header(skb); |
8359925b | 699 | skb->protocol = htons(protocol); |
1da177e4 LT |
700 | skb->pkt_type = PACKET_HOST; |
701 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
702 | skb->dev = t->dev; | |
703 | dst_release(skb->dst); | |
704 | skb->dst = NULL; | |
53ab61c6 | 705 | nf_reset(skb); |
8359925b YK |
706 | |
707 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
708 | ||
1da177e4 LT |
709 | t->stat.rx_packets++; |
710 | t->stat.rx_bytes += skb->len; | |
711 | netif_rx(skb); | |
3144581c | 712 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
713 | return 0; |
714 | } | |
3144581c | 715 | read_unlock(&ip6_tnl_lock); |
1da177e4 | 716 | return 1; |
50fba2aa HX |
717 | |
718 | discard: | |
719 | kfree_skb(skb); | |
720 | return 0; | |
1da177e4 LT |
721 | } |
722 | ||
c4d3efaf YK |
723 | static int ip4ip6_rcv(struct sk_buff *skb) |
724 | { | |
502b0935 YK |
725 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
726 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
727 | } |
728 | ||
8359925b YK |
729 | static int ip6ip6_rcv(struct sk_buff *skb) |
730 | { | |
502b0935 YK |
731 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
732 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
733 | } |
734 | ||
6fb32dde VN |
735 | struct ipv6_tel_txoption { |
736 | struct ipv6_txoptions ops; | |
737 | __u8 dst_opt[8]; | |
738 | }; | |
1da177e4 | 739 | |
6fb32dde VN |
740 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
741 | { | |
742 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 743 | |
6fb32dde VN |
744 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
745 | opt->dst_opt[3] = 1; | |
746 | opt->dst_opt[4] = encap_limit; | |
747 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
748 | opt->dst_opt[6] = 1; | |
1da177e4 | 749 | |
6fb32dde VN |
750 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
751 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
752 | } |
753 | ||
754 | /** | |
3144581c | 755 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 756 | * @t: the outgoing tunnel device |
1ab1457c | 757 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
758 | * |
759 | * Description: | |
1ab1457c | 760 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
761 | * doesn't match source of incoming packet. |
762 | * | |
1ab1457c | 763 | * Return: |
1da177e4 LT |
764 | * 1 if conflict, |
765 | * 0 else | |
766 | **/ | |
767 | ||
768 | static inline int | |
3144581c | 769 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
770 | { |
771 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
772 | } | |
773 | ||
09c6bbf0 VN |
774 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
775 | { | |
776 | struct ip6_tnl_parm *p = &t->parms; | |
777 | int ret = 0; | |
778 | ||
1ab1457c | 779 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
780 | struct net_device *ldev = NULL; |
781 | ||
782 | if (p->link) | |
881d966b | 783 | ldev = dev_get_by_index(&init_net, p->link); |
09c6bbf0 | 784 | |
bfeade08 | 785 | if (unlikely(!ipv6_chk_addr(&init_net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
786 | printk(KERN_WARNING |
787 | "%s xmit: Local address not yet configured!\n", | |
788 | p->name); | |
789 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
bfeade08 | 790 | unlikely(ipv6_chk_addr(&init_net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
791 | printk(KERN_WARNING |
792 | "%s xmit: Routing loop! " | |
793 | "Remote address found on this node!\n", | |
794 | p->name); | |
795 | else | |
796 | ret = 1; | |
797 | if (ldev) | |
798 | dev_put(ldev); | |
799 | } | |
800 | return ret; | |
801 | } | |
1da177e4 | 802 | /** |
61ec2aec | 803 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 804 | * @skb: the outgoing socket buffer |
1ab1457c | 805 | * @dev: the outgoing tunnel device |
61ec2aec YK |
806 | * @dsfield: dscp code for outer header |
807 | * @fl: flow of tunneled packet | |
808 | * @encap_limit: encapsulation limit | |
809 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
810 | * |
811 | * Description: | |
812 | * Build new header and do some sanity checks on the packet before sending | |
813 | * it. | |
814 | * | |
1ab1457c | 815 | * Return: |
c4d3efaf | 816 | * 0 on success |
61ec2aec YK |
817 | * -1 fail |
818 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
819 | **/ |
820 | ||
61ec2aec YK |
821 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
822 | struct net_device *dev, | |
823 | __u8 dsfield, | |
824 | struct flowi *fl, | |
825 | int encap_limit, | |
826 | __u32 *pmtu) | |
1da177e4 | 827 | { |
2941a486 | 828 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 | 829 | struct net_device_stats *stats = &t->stat; |
0660e03f | 830 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 831 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
832 | struct dst_entry *dst; |
833 | struct net_device *tdev; | |
834 | int mtu; | |
c2636b4d | 835 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 836 | u8 proto; |
61ec2aec | 837 | int err = -1; |
1da177e4 | 838 | int pkt_len; |
1da177e4 | 839 | |
1da177e4 LT |
840 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
841 | dst_hold(dst); | |
a57ebc90 | 842 | else { |
61ec2aec | 843 | dst = ip6_route_output(NULL, fl); |
1da177e4 | 844 | |
61ec2aec | 845 | if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
846 | goto tx_err_link_failure; |
847 | } | |
1da177e4 LT |
848 | |
849 | tdev = dst->dev; | |
850 | ||
851 | if (tdev == dev) { | |
852 | stats->collisions++; | |
853 | if (net_ratelimit()) | |
1ab1457c | 854 | printk(KERN_WARNING |
1da177e4 LT |
855 | "%s: Local routing loop detected!\n", |
856 | t->parms.name); | |
857 | goto tx_err_dst_release; | |
858 | } | |
859 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 860 | if (encap_limit >= 0) { |
1da177e4 LT |
861 | max_headroom += 8; |
862 | mtu -= 8; | |
863 | } | |
864 | if (mtu < IPV6_MIN_MTU) | |
865 | mtu = IPV6_MIN_MTU; | |
26892058 YK |
866 | if (skb->dst) |
867 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
1da177e4 | 868 | if (skb->len > mtu) { |
61ec2aec YK |
869 | *pmtu = mtu; |
870 | err = -EMSGSIZE; | |
1da177e4 LT |
871 | goto tx_err_dst_release; |
872 | } | |
873 | ||
874 | /* | |
875 | * Okay, now see if we can stuff it in the buffer as-is. | |
876 | */ | |
877 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 878 | |
cfbba49d PM |
879 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
880 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 881 | struct sk_buff *new_skb; |
1ab1457c | 882 | |
1da177e4 LT |
883 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
884 | goto tx_err_dst_release; | |
885 | ||
886 | if (skb->sk) | |
887 | skb_set_owner_w(new_skb, skb->sk); | |
888 | kfree_skb(skb); | |
889 | skb = new_skb; | |
890 | } | |
891 | dst_release(skb->dst); | |
892 | skb->dst = dst_clone(dst); | |
893 | ||
b0e380b1 | 894 | skb->transport_header = skb->network_header; |
1da177e4 | 895 | |
61ec2aec | 896 | proto = fl->proto; |
6fb32dde VN |
897 | if (encap_limit >= 0) { |
898 | init_tel_txopt(&opt, encap_limit); | |
899 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
900 | } | |
e2d1bca7 ACM |
901 | skb_push(skb, sizeof(struct ipv6hdr)); |
902 | skb_reset_network_header(skb); | |
0660e03f | 903 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 904 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
905 | dsfield = INET_ECN_encapsulate(0, dsfield); |
906 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
907 | ipv6h->hop_limit = t->parms.hop_limit; |
908 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
909 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
910 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
911 | nf_reset(skb); |
912 | pkt_len = skb->len; | |
ef76bc23 | 913 | err = ip6_local_out(skb); |
1da177e4 | 914 | |
b9df3cb8 | 915 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
916 | stats->tx_bytes += pkt_len; |
917 | stats->tx_packets++; | |
918 | } else { | |
919 | stats->tx_errors++; | |
920 | stats->tx_aborted_errors++; | |
921 | } | |
922 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
923 | return 0; |
924 | tx_err_link_failure: | |
925 | stats->tx_carrier_errors++; | |
926 | dst_link_failure(skb); | |
927 | tx_err_dst_release: | |
928 | dst_release(dst); | |
61ec2aec YK |
929 | return err; |
930 | } | |
931 | ||
c4d3efaf YK |
932 | static inline int |
933 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
934 | { | |
935 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 936 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
937 | int encap_limit = -1; |
938 | struct flowi fl; | |
939 | __u8 dsfield; | |
940 | __u32 mtu; | |
941 | int err; | |
942 | ||
502b0935 YK |
943 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
944 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
945 | return -1; |
946 | ||
947 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
948 | encap_limit = t->parms.encap_limit; | |
949 | ||
950 | memcpy(&fl, &t->fl, sizeof (fl)); | |
951 | fl.proto = IPPROTO_IPIP; | |
952 | ||
953 | dsfield = ipv4_get_dsfield(iph); | |
954 | ||
955 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
956 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
957 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
958 | |
959 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
960 | if (err != 0) { | |
961 | /* XXX: send ICMP error even if DF is not set. */ | |
962 | if (err == -EMSGSIZE) | |
963 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
964 | htonl(mtu)); | |
965 | return -1; | |
966 | } | |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
61ec2aec YK |
971 | static inline int |
972 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
973 | { | |
974 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 975 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
976 | int encap_limit = -1; |
977 | __u16 offset; | |
978 | struct flowi fl; | |
979 | __u8 dsfield; | |
980 | __u32 mtu; | |
981 | int err; | |
982 | ||
502b0935 YK |
983 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
984 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
985 | return -1; |
986 | ||
d56f90a7 ACM |
987 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
988 | if (offset > 0) { | |
61ec2aec | 989 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 990 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
991 | if (tel->encap_limit == 0) { |
992 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
993 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
994 | return -1; | |
995 | } | |
996 | encap_limit = tel->encap_limit - 1; | |
997 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
998 | encap_limit = t->parms.encap_limit; | |
999 | ||
1000 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1001 | fl.proto = IPPROTO_IPV6; | |
1002 | ||
1003 | dsfield = ipv6_get_dsfield(ipv6h); | |
1004 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1005 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1006 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1007 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1008 | ||
1009 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1010 | if (err != 0) { | |
1011 | if (err == -EMSGSIZE) | |
1012 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
1013 | return -1; | |
1014 | } | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static int | |
1020 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1021 | { | |
1022 | struct ip6_tnl *t = netdev_priv(dev); | |
1023 | struct net_device_stats *stats = &t->stat; | |
1024 | int ret; | |
1025 | ||
1026 | if (t->recursion++) { | |
1027 | t->stat.collisions++; | |
1028 | goto tx_err; | |
1029 | } | |
1030 | ||
1031 | switch (skb->protocol) { | |
c4d3efaf YK |
1032 | case __constant_htons(ETH_P_IP): |
1033 | ret = ip4ip6_tnl_xmit(skb, dev); | |
1034 | break; | |
61ec2aec YK |
1035 | case __constant_htons(ETH_P_IPV6): |
1036 | ret = ip6ip6_tnl_xmit(skb, dev); | |
1037 | break; | |
1038 | default: | |
1039 | goto tx_err; | |
1040 | } | |
1041 | ||
1042 | if (ret < 0) | |
1043 | goto tx_err; | |
1044 | ||
1045 | t->recursion--; | |
1046 | return 0; | |
1047 | ||
1da177e4 LT |
1048 | tx_err: |
1049 | stats->tx_errors++; | |
1050 | stats->tx_dropped++; | |
1051 | kfree_skb(skb); | |
1052 | t->recursion--; | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1057 | { | |
1058 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1059 | int ltype = ipv6_addr_type(&p->laddr); |
1060 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1061 | |
1062 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1063 | ||
09c6bbf0 VN |
1064 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1065 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1066 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1067 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1068 | if (ltype&IPV6_ADDR_UNICAST) |
1069 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1070 | if (rtype&IPV6_ADDR_UNICAST) | |
1071 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1072 | } |
1073 | } | |
1074 | ||
3144581c | 1075 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1076 | { |
1077 | struct net_device *dev = t->dev; | |
1078 | struct ip6_tnl_parm *p = &t->parms; | |
1079 | struct flowi *fl = &t->fl; | |
1080 | ||
1081 | memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
1082 | memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1083 | ||
1084 | /* Set up flowi template */ | |
1085 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1086 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1087 | fl->oif = p->link; | |
1088 | fl->fl6_flowlabel = 0; | |
1089 | ||
1090 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1091 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1092 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1093 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1094 | ||
1095 | ip6_tnl_set_cap(t); | |
1096 | ||
1097 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1098 | dev->flags |= IFF_POINTOPOINT; | |
1099 | else | |
1100 | dev->flags &= ~IFF_POINTOPOINT; | |
1101 | ||
1102 | dev->iflink = p->link; | |
1103 | ||
1104 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1105 | int strict = (ipv6_addr_type(&p->raddr) & |
1106 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1107 | ||
1da177e4 | 1108 | struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr, |
305d4b3c | 1109 | p->link, strict); |
1da177e4 LT |
1110 | |
1111 | if (rt == NULL) | |
1112 | return; | |
1113 | ||
1114 | if (rt->rt6i_dev) { | |
1115 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1116 | sizeof (struct ipv6hdr); | |
1117 | ||
1118 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1119 | ||
1120 | if (dev->mtu < IPV6_MIN_MTU) | |
1121 | dev->mtu = IPV6_MIN_MTU; | |
1122 | } | |
1123 | dst_release(&rt->u.dst); | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | /** | |
3144581c | 1128 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1129 | * @t: tunnel to be changed |
1130 | * @p: tunnel configuration parameters | |
1131 | * @active: != 0 if tunnel is ready for use | |
1132 | * | |
1133 | * Description: | |
3144581c | 1134 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1135 | **/ |
1136 | ||
1137 | static int | |
3144581c | 1138 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1139 | { |
1140 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1141 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1142 | t->parms.flags = p->flags; | |
1143 | t->parms.hop_limit = p->hop_limit; | |
1144 | t->parms.encap_limit = p->encap_limit; | |
1145 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1146 | t->parms.link = p->link; |
502b0935 | 1147 | t->parms.proto = p->proto; |
0c088890 | 1148 | ip6_tnl_dst_reset(t); |
3144581c | 1149 | ip6_tnl_link_config(t); |
1da177e4 LT |
1150 | return 0; |
1151 | } | |
1152 | ||
1153 | /** | |
3144581c | 1154 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1155 | * @dev: virtual device associated with tunnel |
1156 | * @ifr: parameters passed from userspace | |
1157 | * @cmd: command to be performed | |
1158 | * | |
1159 | * Description: | |
3144581c | 1160 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1161 | * from userspace. |
1da177e4 LT |
1162 | * |
1163 | * The possible commands are the following: | |
1164 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1165 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1166 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1167 | * %SIOCDELTUNNEL: delete tunnel | |
1168 | * | |
1ab1457c | 1169 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1170 | * initialization, can be used for creating other tunnel devices. |
1171 | * | |
1172 | * Return: | |
1173 | * 0 on success, | |
1174 | * %-EFAULT if unable to copy data to or from userspace, | |
1175 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1176 | * %-EINVAL if passed tunnel parameters are invalid, | |
1177 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1178 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1179 | **/ | |
1180 | ||
1181 | static int | |
3144581c | 1182 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1183 | { |
1184 | int err = 0; | |
1da177e4 LT |
1185 | struct ip6_tnl_parm p; |
1186 | struct ip6_tnl *t = NULL; | |
1187 | ||
1188 | switch (cmd) { | |
1189 | case SIOCGETTUNNEL: | |
3144581c | 1190 | if (dev == ip6_fb_tnl_dev) { |
567131a7 | 1191 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1192 | err = -EFAULT; |
1193 | break; | |
1194 | } | |
3144581c | 1195 | t = ip6_tnl_locate(&p, 0); |
567131a7 VN |
1196 | } |
1197 | if (t == NULL) | |
2941a486 | 1198 | t = netdev_priv(dev); |
1da177e4 LT |
1199 | memcpy(&p, &t->parms, sizeof (p)); |
1200 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1201 | err = -EFAULT; | |
1202 | } | |
1203 | break; | |
1204 | case SIOCADDTUNNEL: | |
1205 | case SIOCCHGTUNNEL: | |
1206 | err = -EPERM; | |
1da177e4 LT |
1207 | if (!capable(CAP_NET_ADMIN)) |
1208 | break; | |
567131a7 VN |
1209 | err = -EFAULT; |
1210 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1211 | break; |
567131a7 | 1212 | err = -EINVAL; |
502b0935 YK |
1213 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1214 | p.proto != 0) | |
1da177e4 | 1215 | break; |
3144581c YK |
1216 | t = ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL); |
1217 | if (dev != ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
567131a7 VN |
1218 | if (t != NULL) { |
1219 | if (t->dev != dev) { | |
1220 | err = -EEXIST; | |
1221 | break; | |
1222 | } | |
1223 | } else | |
1224 | t = netdev_priv(dev); | |
1225 | ||
3144581c YK |
1226 | ip6_tnl_unlink(t); |
1227 | err = ip6_tnl_change(t, &p); | |
1228 | ip6_tnl_link(t); | |
1da177e4 LT |
1229 | netdev_state_change(dev); |
1230 | } | |
567131a7 | 1231 | if (t) { |
1da177e4 | 1232 | err = 0; |
567131a7 VN |
1233 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1234 | err = -EFAULT; | |
1235 | ||
1236 | } else | |
1237 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1238 | break; |
1239 | case SIOCDELTUNNEL: | |
1240 | err = -EPERM; | |
1241 | if (!capable(CAP_NET_ADMIN)) | |
1242 | break; | |
1243 | ||
3144581c | 1244 | if (dev == ip6_fb_tnl_dev) { |
567131a7 VN |
1245 | err = -EFAULT; |
1246 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1247 | break; |
567131a7 | 1248 | err = -ENOENT; |
3144581c | 1249 | if ((t = ip6_tnl_locate(&p, 0)) == NULL) |
1da177e4 | 1250 | break; |
567131a7 | 1251 | err = -EPERM; |
3144581c | 1252 | if (t->dev == ip6_fb_tnl_dev) |
1da177e4 | 1253 | break; |
567131a7 | 1254 | dev = t->dev; |
1da177e4 | 1255 | } |
22f8cde5 SH |
1256 | err = 0; |
1257 | unregister_netdevice(dev); | |
1da177e4 LT |
1258 | break; |
1259 | default: | |
1260 | err = -EINVAL; | |
1261 | } | |
1262 | return err; | |
1263 | } | |
1264 | ||
1265 | /** | |
3144581c | 1266 | * ip6_tnl_get_stats - return the stats for tunnel device |
1da177e4 LT |
1267 | * @dev: virtual device associated with tunnel |
1268 | * | |
1269 | * Return: stats for device | |
1270 | **/ | |
1271 | ||
1272 | static struct net_device_stats * | |
3144581c | 1273 | ip6_tnl_get_stats(struct net_device *dev) |
1da177e4 | 1274 | { |
2941a486 | 1275 | return &(((struct ip6_tnl *)netdev_priv(dev))->stat); |
1da177e4 LT |
1276 | } |
1277 | ||
1278 | /** | |
3144581c | 1279 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1280 | * @dev: virtual device associated with tunnel |
1281 | * @new_mtu: the new mtu | |
1282 | * | |
1283 | * Return: | |
1284 | * 0 on success, | |
1285 | * %-EINVAL if mtu too small | |
1286 | **/ | |
1287 | ||
1288 | static int | |
3144581c | 1289 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1290 | { |
1291 | if (new_mtu < IPV6_MIN_MTU) { | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | dev->mtu = new_mtu; | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | /** | |
3144581c | 1299 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1300 | * @dev: virtual device associated with tunnel |
1301 | * | |
1302 | * Description: | |
1303 | * Initialize function pointers and device parameters | |
1304 | **/ | |
1305 | ||
3144581c | 1306 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1307 | { |
3144581c | 1308 | dev->uninit = ip6_tnl_dev_uninit; |
1da177e4 | 1309 | dev->destructor = free_netdev; |
61ec2aec | 1310 | dev->hard_start_xmit = ip6_tnl_xmit; |
3144581c YK |
1311 | dev->get_stats = ip6_tnl_get_stats; |
1312 | dev->do_ioctl = ip6_tnl_ioctl; | |
1313 | dev->change_mtu = ip6_tnl_change_mtu; | |
1da177e4 LT |
1314 | |
1315 | dev->type = ARPHRD_TUNNEL6; | |
1316 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1317 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1318 | dev->flags |= IFF_NOARP; | |
1319 | dev->addr_len = sizeof(struct in6_addr); | |
1320 | } | |
1321 | ||
1322 | ||
1323 | /** | |
3144581c | 1324 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1325 | * @dev: virtual device associated with tunnel |
1326 | **/ | |
1327 | ||
1328 | static inline void | |
3144581c | 1329 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1330 | { |
2941a486 | 1331 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1332 | t->dev = dev; |
1333 | strcpy(t->parms.name, dev->name); | |
1334 | } | |
1335 | ||
1336 | /** | |
3144581c | 1337 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1338 | * @dev: virtual device associated with tunnel |
1339 | **/ | |
1340 | ||
1341 | static int | |
3144581c | 1342 | ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1343 | { |
2941a486 | 1344 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1345 | ip6_tnl_dev_init_gen(dev); |
1346 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1347 | return 0; |
1348 | } | |
1349 | ||
1350 | /** | |
3144581c | 1351 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1352 | * @dev: fallback device |
1353 | * | |
1354 | * Return: 0 | |
1355 | **/ | |
1356 | ||
1ab1457c | 1357 | static int |
3144581c | 1358 | ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1359 | { |
2941a486 | 1360 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c | 1361 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1362 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 LT |
1363 | dev_hold(dev); |
1364 | tnls_wc[0] = t; | |
1365 | return 0; | |
1366 | } | |
1367 | ||
c4d3efaf YK |
1368 | static struct xfrm6_tunnel ip4ip6_handler = { |
1369 | .handler = ip4ip6_rcv, | |
1370 | .err_handler = ip4ip6_err, | |
1371 | .priority = 1, | |
1372 | }; | |
1373 | ||
1da177e4 | 1374 | static struct xfrm6_tunnel ip6ip6_handler = { |
0303770d PM |
1375 | .handler = ip6ip6_rcv, |
1376 | .err_handler = ip6ip6_err, | |
d2acc347 | 1377 | .priority = 1, |
1da177e4 LT |
1378 | }; |
1379 | ||
1380 | /** | |
1381 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1382 | * | |
1383 | * Return: 0 on success | |
1384 | **/ | |
1385 | ||
1386 | static int __init ip6_tunnel_init(void) | |
1387 | { | |
1388 | int err; | |
1389 | ||
c4d3efaf | 1390 | if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { |
3144581c | 1391 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
c4d3efaf YK |
1392 | err = -EAGAIN; |
1393 | goto out; | |
1394 | } | |
1395 | ||
73d605d1 | 1396 | if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { |
3144581c | 1397 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
c4d3efaf YK |
1398 | err = -EAGAIN; |
1399 | goto unreg_ip4ip6; | |
1da177e4 | 1400 | } |
3144581c YK |
1401 | ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", |
1402 | ip6_tnl_dev_setup); | |
1da177e4 | 1403 | |
3144581c | 1404 | if (!ip6_fb_tnl_dev) { |
1da177e4 LT |
1405 | err = -ENOMEM; |
1406 | goto fail; | |
1407 | } | |
3144581c | 1408 | ip6_fb_tnl_dev->init = ip6_fb_tnl_dev_init; |
1da177e4 | 1409 | |
3144581c YK |
1410 | if ((err = register_netdev(ip6_fb_tnl_dev))) { |
1411 | free_netdev(ip6_fb_tnl_dev); | |
1da177e4 LT |
1412 | goto fail; |
1413 | } | |
1414 | return 0; | |
1415 | fail: | |
73d605d1 | 1416 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
c4d3efaf YK |
1417 | unreg_ip4ip6: |
1418 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); | |
1419 | out: | |
1da177e4 LT |
1420 | return err; |
1421 | } | |
1422 | ||
3144581c | 1423 | static void __exit ip6_tnl_destroy_tunnels(void) |
b3fdd9f1 YK |
1424 | { |
1425 | int h; | |
1426 | struct ip6_tnl *t; | |
1427 | ||
1428 | for (h = 0; h < HASH_SIZE; h++) { | |
1429 | while ((t = tnls_r_l[h]) != NULL) | |
1430 | unregister_netdevice(t->dev); | |
1431 | } | |
1432 | ||
1433 | t = tnls_wc[0]; | |
1434 | unregister_netdevice(t->dev); | |
1435 | } | |
1436 | ||
1da177e4 LT |
1437 | /** |
1438 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1439 | **/ | |
1440 | ||
1441 | static void __exit ip6_tunnel_cleanup(void) | |
1442 | { | |
c4d3efaf | 1443 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1444 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1445 | |
73d605d1 | 1446 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1447 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1448 | |
b3fdd9f1 | 1449 | rtnl_lock(); |
3144581c | 1450 | ip6_tnl_destroy_tunnels(); |
b3fdd9f1 | 1451 | rtnl_unlock(); |
1da177e4 LT |
1452 | } |
1453 | ||
1454 | module_init(ip6_tunnel_init); | |
1455 | module_exit(ip6_tunnel_cleanup); |