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> | |
13eeb8e9 PE |
55 | #include <net/net_namespace.h> |
56 | #include <net/netns/generic.h> | |
1da177e4 LT |
57 | |
58 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 59 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 LT |
60 | MODULE_LICENSE("GPL"); |
61 | ||
62 | #define IPV6_TLV_TEL_DST_SIZE 8 | |
63 | ||
64 | #ifdef IP6_TNL_DEBUG | |
0dc47877 | 65 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
66 | #else |
67 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
68 | #endif | |
69 | ||
70 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 71 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
72 | |
73 | #define HASH_SIZE 32 | |
74 | ||
e69a4adc | 75 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
76 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
77 | (HASH_SIZE - 1)) | |
1da177e4 | 78 | |
3144581c YK |
79 | static int ip6_fb_tnl_dev_init(struct net_device *dev); |
80 | static int ip6_tnl_dev_init(struct net_device *dev); | |
81 | static void ip6_tnl_dev_setup(struct net_device *dev); | |
1da177e4 | 82 | |
13eeb8e9 PE |
83 | static int ip6_tnl_net_id; |
84 | struct ip6_tnl_net { | |
15820e12 PE |
85 | /* the IPv6 tunnel fallback device */ |
86 | struct net_device *fb_tnl_dev; | |
13eeb8e9 PE |
87 | }; |
88 | ||
1da177e4 LT |
89 | /* lists for storing tunnels in use */ |
90 | static struct ip6_tnl *tnls_r_l[HASH_SIZE]; | |
91 | static struct ip6_tnl *tnls_wc[1]; | |
92 | static struct ip6_tnl **tnls[2] = { tnls_wc, tnls_r_l }; | |
93 | ||
94 | /* lock for the tunnel lists */ | |
3144581c | 95 | static DEFINE_RWLOCK(ip6_tnl_lock); |
1da177e4 LT |
96 | |
97 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
98 | { | |
99 | struct dst_entry *dst = t->dst_cache; | |
100 | ||
1ab1457c | 101 | if (dst && dst->obsolete && |
1da177e4 LT |
102 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
103 | t->dst_cache = NULL; | |
104 | dst_release(dst); | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | return dst; | |
109 | } | |
110 | ||
111 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
112 | { | |
113 | dst_release(t->dst_cache); | |
114 | t->dst_cache = NULL; | |
115 | } | |
116 | ||
117 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
118 | { | |
119 | struct rt6_info *rt = (struct rt6_info *) dst; | |
120 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
121 | dst_release(t->dst_cache); | |
122 | t->dst_cache = dst; | |
123 | } | |
124 | ||
125 | /** | |
3144581c | 126 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
127 | * @remote: the address of the tunnel exit-point |
128 | * @local: the address of the tunnel entry-point | |
1da177e4 | 129 | * |
1ab1457c | 130 | * Return: |
1da177e4 | 131 | * tunnel matching given end-points if found, |
1ab1457c | 132 | * else fallback tunnel if its device is up, |
1da177e4 LT |
133 | * else %NULL |
134 | **/ | |
135 | ||
136 | static struct ip6_tnl * | |
2dd02c89 | 137 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 LT |
138 | { |
139 | unsigned h0 = HASH(remote); | |
140 | unsigned h1 = HASH(local); | |
141 | struct ip6_tnl *t; | |
142 | ||
143 | for (t = tnls_r_l[h0 ^ h1]; t; t = t->next) { | |
144 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
145 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
146 | (t->dev->flags & IFF_UP)) | |
147 | return t; | |
148 | } | |
149 | if ((t = tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) | |
150 | return t; | |
151 | ||
152 | return NULL; | |
153 | } | |
154 | ||
155 | /** | |
3144581c | 156 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 157 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
158 | * |
159 | * Description: | |
3144581c | 160 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
161 | * &struct in6_addr entries laddr and raddr in @p. |
162 | * | |
1ab1457c | 163 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
164 | **/ |
165 | ||
166 | static struct ip6_tnl ** | |
2dd02c89 | 167 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
168 | { |
169 | struct in6_addr *remote = &p->raddr; | |
170 | struct in6_addr *local = &p->laddr; | |
171 | unsigned h = 0; | |
172 | int prio = 0; | |
173 | ||
174 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
175 | prio = 1; | |
176 | h = HASH(remote) ^ HASH(local); | |
177 | } | |
178 | return &tnls[prio][h]; | |
179 | } | |
180 | ||
181 | /** | |
3144581c | 182 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
183 | * @t: tunnel to be added |
184 | **/ | |
185 | ||
186 | static void | |
2dd02c89 | 187 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 188 | { |
2dd02c89 | 189 | struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 LT |
190 | |
191 | t->next = *tp; | |
3144581c | 192 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 193 | *tp = t; |
3144581c | 194 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
195 | } |
196 | ||
197 | /** | |
3144581c | 198 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
199 | * @t: tunnel to be removed |
200 | **/ | |
201 | ||
202 | static void | |
2dd02c89 | 203 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 LT |
204 | { |
205 | struct ip6_tnl **tp; | |
206 | ||
2dd02c89 | 207 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { |
1da177e4 | 208 | if (t == *tp) { |
3144581c | 209 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 210 | *tp = t->next; |
3144581c | 211 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
212 | break; |
213 | } | |
214 | } | |
215 | } | |
216 | ||
217 | /** | |
218 | * ip6_tnl_create() - create a new tunnel | |
219 | * @p: tunnel parameters | |
220 | * @pt: pointer to new tunnel | |
221 | * | |
222 | * Description: | |
223 | * Create tunnel matching given parameters. | |
1ab1457c YH |
224 | * |
225 | * Return: | |
567131a7 | 226 | * created tunnel or NULL |
1da177e4 LT |
227 | **/ |
228 | ||
2dd02c89 | 229 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
230 | { |
231 | struct net_device *dev; | |
232 | struct ip6_tnl *t; | |
233 | char name[IFNAMSIZ]; | |
234 | int err; | |
2dd02c89 | 235 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 236 | |
34cc7ba6 | 237 | if (p->name[0]) |
1da177e4 | 238 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
239 | else |
240 | sprintf(name, "ip6tnl%%d"); | |
241 | ||
3144581c | 242 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 243 | if (dev == NULL) |
567131a7 | 244 | goto failed; |
1da177e4 | 245 | |
b37d428b PE |
246 | if (strchr(name, '%')) { |
247 | if (dev_alloc_name(dev, name) < 0) | |
248 | goto failed_free; | |
249 | } | |
250 | ||
2941a486 | 251 | t = netdev_priv(dev); |
3144581c | 252 | dev->init = ip6_tnl_dev_init; |
1da177e4 LT |
253 | t->parms = *p; |
254 | ||
b37d428b PE |
255 | if ((err = register_netdevice(dev)) < 0) |
256 | goto failed_free; | |
257 | ||
1da177e4 | 258 | dev_hold(dev); |
2dd02c89 | 259 | ip6_tnl_link(ip6n, t); |
567131a7 | 260 | return t; |
b37d428b PE |
261 | |
262 | failed_free: | |
263 | free_netdev(dev); | |
567131a7 VN |
264 | failed: |
265 | return NULL; | |
1da177e4 LT |
266 | } |
267 | ||
268 | /** | |
3144581c | 269 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 270 | * @p: tunnel parameters |
1da177e4 LT |
271 | * @create: != 0 if allowed to create new tunnel if no match found |
272 | * | |
273 | * Description: | |
3144581c | 274 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
275 | * based on @parms. If this is unsuccessful, but @create is set a new |
276 | * tunnel device is created and registered for use. | |
277 | * | |
278 | * Return: | |
567131a7 | 279 | * matching tunnel or NULL |
1da177e4 LT |
280 | **/ |
281 | ||
2dd02c89 PE |
282 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
283 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
284 | { |
285 | struct in6_addr *remote = &p->raddr; | |
286 | struct in6_addr *local = &p->laddr; | |
287 | struct ip6_tnl *t; | |
2dd02c89 | 288 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 289 | |
2dd02c89 | 290 | for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) { |
1da177e4 | 291 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
292 | ipv6_addr_equal(remote, &t->parms.raddr)) |
293 | return t; | |
1da177e4 LT |
294 | } |
295 | if (!create) | |
567131a7 | 296 | return NULL; |
2dd02c89 | 297 | return ip6_tnl_create(net, p); |
1da177e4 LT |
298 | } |
299 | ||
300 | /** | |
3144581c | 301 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 302 | * @dev: the device to be destroyed |
1ab1457c | 303 | * |
1da177e4 | 304 | * Description: |
3144581c | 305 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
306 | **/ |
307 | ||
308 | static void | |
3144581c | 309 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 310 | { |
2941a486 | 311 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
312 | struct net *net = dev_net(dev); |
313 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 314 | |
15820e12 | 315 | if (dev == ip6n->fb_tnl_dev) { |
3144581c | 316 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 317 | tnls_wc[0] = NULL; |
3144581c | 318 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 | 319 | } else { |
2dd02c89 | 320 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
321 | } |
322 | ip6_tnl_dst_reset(t); | |
323 | dev_put(dev); | |
324 | } | |
325 | ||
326 | /** | |
327 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
328 | * @skb: received socket buffer | |
329 | * | |
1ab1457c YH |
330 | * Return: |
331 | * 0 if none was found, | |
1da177e4 LT |
332 | * else index to encapsulation limit |
333 | **/ | |
334 | ||
335 | static __u16 | |
336 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
337 | { | |
338 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
339 | __u8 nexthdr = ipv6h->nexthdr; | |
340 | __u16 off = sizeof (*ipv6h); | |
341 | ||
342 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
343 | __u16 optlen = 0; | |
344 | struct ipv6_opt_hdr *hdr; | |
345 | if (raw + off + sizeof (*hdr) > skb->data && | |
346 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
347 | break; | |
348 | ||
349 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
350 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
351 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
352 | if (frag_hdr->frag_off) | |
353 | break; | |
354 | optlen = 8; | |
355 | } else if (nexthdr == NEXTHDR_AUTH) { | |
356 | optlen = (hdr->hdrlen + 2) << 2; | |
357 | } else { | |
358 | optlen = ipv6_optlen(hdr); | |
359 | } | |
360 | if (nexthdr == NEXTHDR_DEST) { | |
361 | __u16 i = off + 2; | |
362 | while (1) { | |
363 | struct ipv6_tlv_tnl_enc_lim *tel; | |
364 | ||
365 | /* No more room for encapsulation limit */ | |
366 | if (i + sizeof (*tel) > off + optlen) | |
367 | break; | |
368 | ||
369 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
370 | /* return index of option if found and valid */ | |
371 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
372 | tel->length == 1) | |
373 | return i; | |
374 | /* else jump to next option */ | |
375 | if (tel->type) | |
376 | i += tel->length + 2; | |
377 | else | |
378 | i++; | |
379 | } | |
380 | } | |
381 | nexthdr = hdr->nexthdr; | |
382 | off += optlen; | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
387 | /** | |
e490d1d8 | 388 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
389 | * |
390 | * Description: | |
e490d1d8 | 391 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
392 | * to the specifications in RFC 2473. |
393 | **/ | |
394 | ||
d2acc347 | 395 | static int |
502b0935 | 396 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
704eae1f | 397 | int *type, int *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
398 | { |
399 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
400 | struct ip6_tnl *t; | |
401 | int rel_msg = 0; | |
402 | int rel_type = ICMPV6_DEST_UNREACH; | |
403 | int rel_code = ICMPV6_ADDR_UNREACH; | |
404 | __u32 rel_info = 0; | |
405 | __u16 len; | |
d2acc347 | 406 | int err = -ENOENT; |
1da177e4 | 407 | |
1ab1457c YH |
408 | /* If the packet doesn't contain the original IPv6 header we are |
409 | in trouble since we might need the source address for further | |
1da177e4 LT |
410 | processing of the error. */ |
411 | ||
3144581c | 412 | read_lock(&ip6_tnl_lock); |
8704ca7e | 413 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 414 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
415 | goto out; |
416 | ||
502b0935 YK |
417 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
418 | goto out; | |
419 | ||
d2acc347 HX |
420 | err = 0; |
421 | ||
e490d1d8 | 422 | switch (*type) { |
1da177e4 LT |
423 | __u32 teli; |
424 | struct ipv6_tlv_tnl_enc_lim *tel; | |
425 | __u32 mtu; | |
426 | case ICMPV6_DEST_UNREACH: | |
427 | if (net_ratelimit()) | |
428 | printk(KERN_WARNING | |
429 | "%s: Path to destination invalid " | |
430 | "or inactive!\n", t->parms.name); | |
431 | rel_msg = 1; | |
432 | break; | |
433 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 434 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
435 | if (net_ratelimit()) |
436 | printk(KERN_WARNING | |
437 | "%s: Too small hop limit or " | |
1ab1457c | 438 | "routing loop in tunnel!\n", |
1da177e4 LT |
439 | t->parms.name); |
440 | rel_msg = 1; | |
441 | } | |
442 | break; | |
443 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 444 | teli = 0; |
e490d1d8 | 445 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 446 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 447 | |
704eae1f | 448 | if (teli && teli == *info - 2) { |
1da177e4 LT |
449 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
450 | if (tel->encap_limit == 0) { | |
451 | if (net_ratelimit()) | |
452 | printk(KERN_WARNING | |
453 | "%s: Too small encapsulation " | |
454 | "limit or routing loop in " | |
455 | "tunnel!\n", t->parms.name); | |
456 | rel_msg = 1; | |
457 | } | |
107a5fe6 VN |
458 | } else if (net_ratelimit()) { |
459 | printk(KERN_WARNING | |
460 | "%s: Recipient unable to parse tunneled " | |
461 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
462 | } |
463 | break; | |
464 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 465 | mtu = *info - offset; |
1da177e4 LT |
466 | if (mtu < IPV6_MIN_MTU) |
467 | mtu = IPV6_MIN_MTU; | |
468 | t->dev->mtu = mtu; | |
469 | ||
cc6cdac0 | 470 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
471 | rel_type = ICMPV6_PKT_TOOBIG; |
472 | rel_code = 0; | |
473 | rel_info = mtu; | |
474 | rel_msg = 1; | |
475 | } | |
476 | break; | |
477 | } | |
e490d1d8 YK |
478 | |
479 | *type = rel_type; | |
480 | *code = rel_code; | |
481 | *info = rel_info; | |
482 | *msg = rel_msg; | |
483 | ||
484 | out: | |
3144581c | 485 | read_unlock(&ip6_tnl_lock); |
e490d1d8 YK |
486 | return err; |
487 | } | |
488 | ||
c4d3efaf YK |
489 | static int |
490 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
704eae1f | 491 | int type, int code, int offset, __be32 info) |
c4d3efaf YK |
492 | { |
493 | int rel_msg = 0; | |
494 | int rel_type = type; | |
495 | int rel_code = code; | |
704eae1f | 496 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
497 | int err; |
498 | struct sk_buff *skb2; | |
499 | struct iphdr *eiph; | |
500 | struct flowi fl; | |
501 | struct rtable *rt; | |
502 | ||
502b0935 YK |
503 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
504 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
505 | if (err < 0) |
506 | return err; | |
507 | ||
508 | if (rel_msg == 0) | |
509 | return 0; | |
510 | ||
511 | switch (rel_type) { | |
512 | case ICMPV6_DEST_UNREACH: | |
513 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
514 | return 0; | |
515 | rel_type = ICMP_DEST_UNREACH; | |
516 | rel_code = ICMP_HOST_UNREACH; | |
517 | break; | |
518 | case ICMPV6_PKT_TOOBIG: | |
519 | if (rel_code != 0) | |
520 | return 0; | |
521 | rel_type = ICMP_DEST_UNREACH; | |
522 | rel_code = ICMP_FRAG_NEEDED; | |
523 | break; | |
524 | default: | |
525 | return 0; | |
526 | } | |
527 | ||
528 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
529 | return 0; | |
530 | ||
531 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
532 | if (!skb2) | |
533 | return 0; | |
534 | ||
535 | dst_release(skb2->dst); | |
536 | skb2->dst = NULL; | |
537 | skb_pull(skb2, offset); | |
c1d2bbe1 | 538 | skb_reset_network_header(skb2); |
eddc9ec5 | 539 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
540 | |
541 | /* Try to guess incoming interface */ | |
542 | memset(&fl, 0, sizeof(fl)); | |
543 | fl.fl4_dst = eiph->saddr; | |
544 | fl.fl4_tos = RT_TOS(eiph->tos); | |
545 | fl.proto = IPPROTO_IPIP; | |
f206351a | 546 | if (ip_route_output_key(&init_net, &rt, &fl)) |
c4d3efaf YK |
547 | goto out; |
548 | ||
549 | skb2->dev = rt->u.dst.dev; | |
550 | ||
551 | /* route "incoming" packet */ | |
552 | if (rt->rt_flags & RTCF_LOCAL) { | |
553 | ip_rt_put(rt); | |
554 | rt = NULL; | |
555 | fl.fl4_dst = eiph->daddr; | |
556 | fl.fl4_src = eiph->saddr; | |
557 | fl.fl4_tos = eiph->tos; | |
f206351a | 558 | if (ip_route_output_key(&init_net, &rt, &fl) || |
c4d3efaf YK |
559 | rt->u.dst.dev->type != ARPHRD_TUNNEL) { |
560 | ip_rt_put(rt); | |
561 | goto out; | |
562 | } | |
9937ded8 | 563 | skb2->dst = (struct dst_entry *)rt; |
c4d3efaf YK |
564 | } else { |
565 | ip_rt_put(rt); | |
566 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
567 | skb2->dev) || | |
568 | skb2->dst->dev->type != ARPHRD_TUNNEL) | |
569 | goto out; | |
570 | } | |
571 | ||
572 | /* change mtu on this route */ | |
573 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
574 | if (rel_info > dst_mtu(skb2->dst)) | |
575 | goto out; | |
576 | ||
577 | skb2->dst->ops->update_pmtu(skb2->dst, rel_info); | |
c4d3efaf YK |
578 | } |
579 | ||
704eae1f | 580 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
581 | |
582 | out: | |
583 | kfree_skb(skb2); | |
584 | return 0; | |
585 | } | |
586 | ||
e490d1d8 YK |
587 | static int |
588 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
704eae1f | 589 | int type, int code, int offset, __be32 info) |
e490d1d8 YK |
590 | { |
591 | int rel_msg = 0; | |
592 | int rel_type = type; | |
593 | int rel_code = code; | |
704eae1f | 594 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
595 | int err; |
596 | ||
502b0935 YK |
597 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
598 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
599 | if (err < 0) |
600 | return err; | |
601 | ||
602 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
603 | struct rt6_info *rt; |
604 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 605 | |
1da177e4 | 606 | if (!skb2) |
e490d1d8 | 607 | return 0; |
1da177e4 LT |
608 | |
609 | dst_release(skb2->dst); | |
610 | skb2->dst = NULL; | |
611 | skb_pull(skb2, offset); | |
c1d2bbe1 | 612 | skb_reset_network_header(skb2); |
1da177e4 LT |
613 | |
614 | /* Try to guess incoming interface */ | |
606a2b48 | 615 | rt = rt6_lookup(&init_net, &ipv6_hdr(skb2)->saddr, NULL, 0, 0); |
1da177e4 LT |
616 | |
617 | if (rt && rt->rt6i_dev) | |
618 | skb2->dev = rt->rt6i_dev; | |
619 | ||
620 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
621 | ||
622 | if (rt) | |
623 | dst_release(&rt->u.dst); | |
624 | ||
625 | kfree_skb(skb2); | |
626 | } | |
e490d1d8 YK |
627 | |
628 | return 0; | |
1da177e4 LT |
629 | } |
630 | ||
c4d3efaf YK |
631 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
632 | struct ipv6hdr *ipv6h, | |
633 | struct sk_buff *skb) | |
634 | { | |
635 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
636 | ||
637 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 638 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
639 | |
640 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 641 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
642 | } |
643 | ||
8359925b YK |
644 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
645 | struct ipv6hdr *ipv6h, | |
646 | struct sk_buff *skb) | |
1da177e4 | 647 | { |
8359925b | 648 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 649 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 650 | |
8359925b | 651 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 652 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 653 | } |
8359925b | 654 | |
09c6bbf0 VN |
655 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
656 | { | |
657 | struct ip6_tnl_parm *p = &t->parms; | |
658 | int ret = 0; | |
659 | ||
660 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 661 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
662 | |
663 | if (p->link) | |
881d966b | 664 | ldev = dev_get_by_index(&init_net, p->link); |
09c6bbf0 VN |
665 | |
666 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
bfeade08 DL |
667 | likely(ipv6_chk_addr(&init_net, &p->laddr, ldev, 0))) && |
668 | likely(!ipv6_chk_addr(&init_net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
669 | ret = 1; |
670 | ||
671 | if (ldev) | |
672 | dev_put(ldev); | |
673 | } | |
674 | return ret; | |
675 | } | |
1da177e4 LT |
676 | |
677 | /** | |
3144581c | 678 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 679 | * @skb: received socket buffer |
8359925b YK |
680 | * @protocol: ethernet protocol ID |
681 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
682 | * |
683 | * Return: 0 | |
684 | **/ | |
685 | ||
8359925b | 686 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 687 | __u8 ipproto, |
8359925b YK |
688 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
689 | struct ipv6hdr *ipv6h, | |
690 | struct sk_buff *skb)) | |
1da177e4 | 691 | { |
1da177e4 | 692 | struct ip6_tnl *t; |
0660e03f | 693 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 694 | |
3144581c | 695 | read_lock(&ip6_tnl_lock); |
1da177e4 | 696 | |
8704ca7e | 697 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 698 | &ipv6h->daddr)) != NULL) { |
502b0935 YK |
699 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
700 | read_unlock(&ip6_tnl_lock); | |
701 | goto discard; | |
702 | } | |
703 | ||
1da177e4 | 704 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
3144581c | 705 | read_unlock(&ip6_tnl_lock); |
50fba2aa | 706 | goto discard; |
1da177e4 LT |
707 | } |
708 | ||
09c6bbf0 | 709 | if (!ip6_tnl_rcv_ctl(t)) { |
1da177e4 | 710 | t->stat.rx_dropped++; |
3144581c | 711 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
712 | goto discard; |
713 | } | |
714 | secpath_reset(skb); | |
b0e380b1 | 715 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 716 | skb_reset_network_header(skb); |
8359925b | 717 | skb->protocol = htons(protocol); |
1da177e4 LT |
718 | skb->pkt_type = PACKET_HOST; |
719 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
720 | skb->dev = t->dev; | |
721 | dst_release(skb->dst); | |
722 | skb->dst = NULL; | |
53ab61c6 | 723 | nf_reset(skb); |
8359925b YK |
724 | |
725 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
726 | ||
1da177e4 LT |
727 | t->stat.rx_packets++; |
728 | t->stat.rx_bytes += skb->len; | |
729 | netif_rx(skb); | |
3144581c | 730 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
731 | return 0; |
732 | } | |
3144581c | 733 | read_unlock(&ip6_tnl_lock); |
1da177e4 | 734 | return 1; |
50fba2aa HX |
735 | |
736 | discard: | |
737 | kfree_skb(skb); | |
738 | return 0; | |
1da177e4 LT |
739 | } |
740 | ||
c4d3efaf YK |
741 | static int ip4ip6_rcv(struct sk_buff *skb) |
742 | { | |
502b0935 YK |
743 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
744 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
745 | } |
746 | ||
8359925b YK |
747 | static int ip6ip6_rcv(struct sk_buff *skb) |
748 | { | |
502b0935 YK |
749 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
750 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
751 | } |
752 | ||
6fb32dde VN |
753 | struct ipv6_tel_txoption { |
754 | struct ipv6_txoptions ops; | |
755 | __u8 dst_opt[8]; | |
756 | }; | |
1da177e4 | 757 | |
6fb32dde VN |
758 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
759 | { | |
760 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 761 | |
6fb32dde VN |
762 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
763 | opt->dst_opt[3] = 1; | |
764 | opt->dst_opt[4] = encap_limit; | |
765 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
766 | opt->dst_opt[6] = 1; | |
1da177e4 | 767 | |
6fb32dde VN |
768 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
769 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
770 | } |
771 | ||
772 | /** | |
3144581c | 773 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 774 | * @t: the outgoing tunnel device |
1ab1457c | 775 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
776 | * |
777 | * Description: | |
1ab1457c | 778 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
779 | * doesn't match source of incoming packet. |
780 | * | |
1ab1457c | 781 | * Return: |
1da177e4 LT |
782 | * 1 if conflict, |
783 | * 0 else | |
784 | **/ | |
785 | ||
786 | static inline int | |
3144581c | 787 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
788 | { |
789 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
790 | } | |
791 | ||
09c6bbf0 VN |
792 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
793 | { | |
794 | struct ip6_tnl_parm *p = &t->parms; | |
795 | int ret = 0; | |
796 | ||
1ab1457c | 797 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
798 | struct net_device *ldev = NULL; |
799 | ||
800 | if (p->link) | |
881d966b | 801 | ldev = dev_get_by_index(&init_net, p->link); |
09c6bbf0 | 802 | |
bfeade08 | 803 | if (unlikely(!ipv6_chk_addr(&init_net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
804 | printk(KERN_WARNING |
805 | "%s xmit: Local address not yet configured!\n", | |
806 | p->name); | |
807 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
bfeade08 | 808 | unlikely(ipv6_chk_addr(&init_net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
809 | printk(KERN_WARNING |
810 | "%s xmit: Routing loop! " | |
811 | "Remote address found on this node!\n", | |
812 | p->name); | |
813 | else | |
814 | ret = 1; | |
815 | if (ldev) | |
816 | dev_put(ldev); | |
817 | } | |
818 | return ret; | |
819 | } | |
1da177e4 | 820 | /** |
61ec2aec | 821 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 822 | * @skb: the outgoing socket buffer |
1ab1457c | 823 | * @dev: the outgoing tunnel device |
61ec2aec YK |
824 | * @dsfield: dscp code for outer header |
825 | * @fl: flow of tunneled packet | |
826 | * @encap_limit: encapsulation limit | |
827 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
828 | * |
829 | * Description: | |
830 | * Build new header and do some sanity checks on the packet before sending | |
831 | * it. | |
832 | * | |
1ab1457c | 833 | * Return: |
c4d3efaf | 834 | * 0 on success |
61ec2aec YK |
835 | * -1 fail |
836 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
837 | **/ |
838 | ||
61ec2aec YK |
839 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
840 | struct net_device *dev, | |
841 | __u8 dsfield, | |
842 | struct flowi *fl, | |
843 | int encap_limit, | |
844 | __u32 *pmtu) | |
1da177e4 | 845 | { |
2941a486 | 846 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 | 847 | struct net_device_stats *stats = &t->stat; |
0660e03f | 848 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 849 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
850 | struct dst_entry *dst; |
851 | struct net_device *tdev; | |
852 | int mtu; | |
c2636b4d | 853 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 854 | u8 proto; |
61ec2aec | 855 | int err = -1; |
1da177e4 | 856 | int pkt_len; |
1da177e4 | 857 | |
1da177e4 LT |
858 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
859 | dst_hold(dst); | |
a57ebc90 | 860 | else { |
4591db4f | 861 | dst = ip6_route_output(&init_net, NULL, fl); |
1da177e4 | 862 | |
61ec2aec | 863 | if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
864 | goto tx_err_link_failure; |
865 | } | |
1da177e4 LT |
866 | |
867 | tdev = dst->dev; | |
868 | ||
869 | if (tdev == dev) { | |
870 | stats->collisions++; | |
871 | if (net_ratelimit()) | |
1ab1457c | 872 | printk(KERN_WARNING |
1da177e4 LT |
873 | "%s: Local routing loop detected!\n", |
874 | t->parms.name); | |
875 | goto tx_err_dst_release; | |
876 | } | |
877 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 878 | if (encap_limit >= 0) { |
1da177e4 LT |
879 | max_headroom += 8; |
880 | mtu -= 8; | |
881 | } | |
882 | if (mtu < IPV6_MIN_MTU) | |
883 | mtu = IPV6_MIN_MTU; | |
26892058 YK |
884 | if (skb->dst) |
885 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
1da177e4 | 886 | if (skb->len > mtu) { |
61ec2aec YK |
887 | *pmtu = mtu; |
888 | err = -EMSGSIZE; | |
1da177e4 LT |
889 | goto tx_err_dst_release; |
890 | } | |
891 | ||
892 | /* | |
893 | * Okay, now see if we can stuff it in the buffer as-is. | |
894 | */ | |
895 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 896 | |
cfbba49d PM |
897 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
898 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 899 | struct sk_buff *new_skb; |
1ab1457c | 900 | |
1da177e4 LT |
901 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
902 | goto tx_err_dst_release; | |
903 | ||
904 | if (skb->sk) | |
905 | skb_set_owner_w(new_skb, skb->sk); | |
906 | kfree_skb(skb); | |
907 | skb = new_skb; | |
908 | } | |
909 | dst_release(skb->dst); | |
910 | skb->dst = dst_clone(dst); | |
911 | ||
b0e380b1 | 912 | skb->transport_header = skb->network_header; |
1da177e4 | 913 | |
61ec2aec | 914 | proto = fl->proto; |
6fb32dde VN |
915 | if (encap_limit >= 0) { |
916 | init_tel_txopt(&opt, encap_limit); | |
917 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
918 | } | |
e2d1bca7 ACM |
919 | skb_push(skb, sizeof(struct ipv6hdr)); |
920 | skb_reset_network_header(skb); | |
0660e03f | 921 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 922 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
923 | dsfield = INET_ECN_encapsulate(0, dsfield); |
924 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
925 | ipv6h->hop_limit = t->parms.hop_limit; |
926 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
927 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
928 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
929 | nf_reset(skb); |
930 | pkt_len = skb->len; | |
ef76bc23 | 931 | err = ip6_local_out(skb); |
1da177e4 | 932 | |
b9df3cb8 | 933 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
934 | stats->tx_bytes += pkt_len; |
935 | stats->tx_packets++; | |
936 | } else { | |
937 | stats->tx_errors++; | |
938 | stats->tx_aborted_errors++; | |
939 | } | |
940 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
941 | return 0; |
942 | tx_err_link_failure: | |
943 | stats->tx_carrier_errors++; | |
944 | dst_link_failure(skb); | |
945 | tx_err_dst_release: | |
946 | dst_release(dst); | |
61ec2aec YK |
947 | return err; |
948 | } | |
949 | ||
c4d3efaf YK |
950 | static inline int |
951 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
952 | { | |
953 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 954 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
955 | int encap_limit = -1; |
956 | struct flowi fl; | |
957 | __u8 dsfield; | |
958 | __u32 mtu; | |
959 | int err; | |
960 | ||
502b0935 YK |
961 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
962 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
963 | return -1; |
964 | ||
965 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
966 | encap_limit = t->parms.encap_limit; | |
967 | ||
968 | memcpy(&fl, &t->fl, sizeof (fl)); | |
969 | fl.proto = IPPROTO_IPIP; | |
970 | ||
971 | dsfield = ipv4_get_dsfield(iph); | |
972 | ||
973 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
974 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
975 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
976 | |
977 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
978 | if (err != 0) { | |
979 | /* XXX: send ICMP error even if DF is not set. */ | |
980 | if (err == -EMSGSIZE) | |
981 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
982 | htonl(mtu)); | |
983 | return -1; | |
984 | } | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
61ec2aec YK |
989 | static inline int |
990 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
991 | { | |
992 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 993 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
994 | int encap_limit = -1; |
995 | __u16 offset; | |
996 | struct flowi fl; | |
997 | __u8 dsfield; | |
998 | __u32 mtu; | |
999 | int err; | |
1000 | ||
502b0935 YK |
1001 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1002 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1003 | return -1; |
1004 | ||
d56f90a7 ACM |
1005 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1006 | if (offset > 0) { | |
61ec2aec | 1007 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1008 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1009 | if (tel->encap_limit == 0) { |
1010 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
1011 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
1012 | return -1; | |
1013 | } | |
1014 | encap_limit = tel->encap_limit - 1; | |
1015 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1016 | encap_limit = t->parms.encap_limit; | |
1017 | ||
1018 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1019 | fl.proto = IPPROTO_IPV6; | |
1020 | ||
1021 | dsfield = ipv6_get_dsfield(ipv6h); | |
1022 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1023 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1024 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1025 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1026 | ||
1027 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1028 | if (err != 0) { | |
1029 | if (err == -EMSGSIZE) | |
1030 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
1031 | return -1; | |
1032 | } | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | static int | |
1038 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1039 | { | |
1040 | struct ip6_tnl *t = netdev_priv(dev); | |
1041 | struct net_device_stats *stats = &t->stat; | |
1042 | int ret; | |
1043 | ||
1044 | if (t->recursion++) { | |
1045 | t->stat.collisions++; | |
1046 | goto tx_err; | |
1047 | } | |
1048 | ||
1049 | switch (skb->protocol) { | |
c4d3efaf YK |
1050 | case __constant_htons(ETH_P_IP): |
1051 | ret = ip4ip6_tnl_xmit(skb, dev); | |
1052 | break; | |
61ec2aec YK |
1053 | case __constant_htons(ETH_P_IPV6): |
1054 | ret = ip6ip6_tnl_xmit(skb, dev); | |
1055 | break; | |
1056 | default: | |
1057 | goto tx_err; | |
1058 | } | |
1059 | ||
1060 | if (ret < 0) | |
1061 | goto tx_err; | |
1062 | ||
1063 | t->recursion--; | |
1064 | return 0; | |
1065 | ||
1da177e4 LT |
1066 | tx_err: |
1067 | stats->tx_errors++; | |
1068 | stats->tx_dropped++; | |
1069 | kfree_skb(skb); | |
1070 | t->recursion--; | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1075 | { | |
1076 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1077 | int ltype = ipv6_addr_type(&p->laddr); |
1078 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1079 | |
1080 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1081 | ||
09c6bbf0 VN |
1082 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1083 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1084 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1085 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1086 | if (ltype&IPV6_ADDR_UNICAST) |
1087 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1088 | if (rtype&IPV6_ADDR_UNICAST) | |
1089 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1090 | } |
1091 | } | |
1092 | ||
3144581c | 1093 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1094 | { |
1095 | struct net_device *dev = t->dev; | |
1096 | struct ip6_tnl_parm *p = &t->parms; | |
1097 | struct flowi *fl = &t->fl; | |
1098 | ||
1099 | memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
1100 | memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1101 | ||
1102 | /* Set up flowi template */ | |
1103 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1104 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1105 | fl->oif = p->link; | |
1106 | fl->fl6_flowlabel = 0; | |
1107 | ||
1108 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1109 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1110 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1111 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1112 | ||
1113 | ip6_tnl_set_cap(t); | |
1114 | ||
1115 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1116 | dev->flags |= IFF_POINTOPOINT; | |
1117 | else | |
1118 | dev->flags &= ~IFF_POINTOPOINT; | |
1119 | ||
1120 | dev->iflink = p->link; | |
1121 | ||
1122 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1123 | int strict = (ipv6_addr_type(&p->raddr) & |
1124 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1125 | ||
606a2b48 | 1126 | struct rt6_info *rt = rt6_lookup(&init_net, &p->raddr, &p->laddr, |
305d4b3c | 1127 | p->link, strict); |
1da177e4 LT |
1128 | |
1129 | if (rt == NULL) | |
1130 | return; | |
1131 | ||
1132 | if (rt->rt6i_dev) { | |
1133 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1134 | sizeof (struct ipv6hdr); | |
1135 | ||
1136 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1137 | ||
1138 | if (dev->mtu < IPV6_MIN_MTU) | |
1139 | dev->mtu = IPV6_MIN_MTU; | |
1140 | } | |
1141 | dst_release(&rt->u.dst); | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /** | |
3144581c | 1146 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1147 | * @t: tunnel to be changed |
1148 | * @p: tunnel configuration parameters | |
1149 | * @active: != 0 if tunnel is ready for use | |
1150 | * | |
1151 | * Description: | |
3144581c | 1152 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1153 | **/ |
1154 | ||
1155 | static int | |
3144581c | 1156 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1157 | { |
1158 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1159 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1160 | t->parms.flags = p->flags; | |
1161 | t->parms.hop_limit = p->hop_limit; | |
1162 | t->parms.encap_limit = p->encap_limit; | |
1163 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1164 | t->parms.link = p->link; |
502b0935 | 1165 | t->parms.proto = p->proto; |
0c088890 | 1166 | ip6_tnl_dst_reset(t); |
3144581c | 1167 | ip6_tnl_link_config(t); |
1da177e4 LT |
1168 | return 0; |
1169 | } | |
1170 | ||
1171 | /** | |
3144581c | 1172 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1173 | * @dev: virtual device associated with tunnel |
1174 | * @ifr: parameters passed from userspace | |
1175 | * @cmd: command to be performed | |
1176 | * | |
1177 | * Description: | |
3144581c | 1178 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1179 | * from userspace. |
1da177e4 LT |
1180 | * |
1181 | * The possible commands are the following: | |
1182 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1183 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1184 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1185 | * %SIOCDELTUNNEL: delete tunnel | |
1186 | * | |
1ab1457c | 1187 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1188 | * initialization, can be used for creating other tunnel devices. |
1189 | * | |
1190 | * Return: | |
1191 | * 0 on success, | |
1192 | * %-EFAULT if unable to copy data to or from userspace, | |
1193 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1194 | * %-EINVAL if passed tunnel parameters are invalid, | |
1195 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1196 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1197 | **/ | |
1198 | ||
1199 | static int | |
3144581c | 1200 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1201 | { |
1202 | int err = 0; | |
1da177e4 LT |
1203 | struct ip6_tnl_parm p; |
1204 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1205 | struct net *net = dev_net(dev); |
1206 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1207 | |
1208 | switch (cmd) { | |
1209 | case SIOCGETTUNNEL: | |
15820e12 | 1210 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1211 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1212 | err = -EFAULT; |
1213 | break; | |
1214 | } | |
2dd02c89 | 1215 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1216 | } |
1217 | if (t == NULL) | |
2941a486 | 1218 | t = netdev_priv(dev); |
1da177e4 LT |
1219 | memcpy(&p, &t->parms, sizeof (p)); |
1220 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1221 | err = -EFAULT; | |
1222 | } | |
1223 | break; | |
1224 | case SIOCADDTUNNEL: | |
1225 | case SIOCCHGTUNNEL: | |
1226 | err = -EPERM; | |
1da177e4 LT |
1227 | if (!capable(CAP_NET_ADMIN)) |
1228 | break; | |
567131a7 VN |
1229 | err = -EFAULT; |
1230 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1231 | break; |
567131a7 | 1232 | err = -EINVAL; |
502b0935 YK |
1233 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1234 | p.proto != 0) | |
1da177e4 | 1235 | break; |
2dd02c89 | 1236 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1237 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1238 | if (t != NULL) { |
1239 | if (t->dev != dev) { | |
1240 | err = -EEXIST; | |
1241 | break; | |
1242 | } | |
1243 | } else | |
1244 | t = netdev_priv(dev); | |
1245 | ||
2dd02c89 | 1246 | ip6_tnl_unlink(ip6n, t); |
3144581c | 1247 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1248 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1249 | netdev_state_change(dev); |
1250 | } | |
567131a7 | 1251 | if (t) { |
1da177e4 | 1252 | err = 0; |
567131a7 VN |
1253 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1254 | err = -EFAULT; | |
1255 | ||
1256 | } else | |
1257 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1258 | break; |
1259 | case SIOCDELTUNNEL: | |
1260 | err = -EPERM; | |
1261 | if (!capable(CAP_NET_ADMIN)) | |
1262 | break; | |
1263 | ||
15820e12 | 1264 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1265 | err = -EFAULT; |
1266 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1267 | break; |
567131a7 | 1268 | err = -ENOENT; |
2dd02c89 | 1269 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1270 | break; |
567131a7 | 1271 | err = -EPERM; |
15820e12 | 1272 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1273 | break; |
567131a7 | 1274 | dev = t->dev; |
1da177e4 | 1275 | } |
22f8cde5 SH |
1276 | err = 0; |
1277 | unregister_netdevice(dev); | |
1da177e4 LT |
1278 | break; |
1279 | default: | |
1280 | err = -EINVAL; | |
1281 | } | |
1282 | return err; | |
1283 | } | |
1284 | ||
1285 | /** | |
3144581c | 1286 | * ip6_tnl_get_stats - return the stats for tunnel device |
1da177e4 LT |
1287 | * @dev: virtual device associated with tunnel |
1288 | * | |
1289 | * Return: stats for device | |
1290 | **/ | |
1291 | ||
1292 | static struct net_device_stats * | |
3144581c | 1293 | ip6_tnl_get_stats(struct net_device *dev) |
1da177e4 | 1294 | { |
2941a486 | 1295 | return &(((struct ip6_tnl *)netdev_priv(dev))->stat); |
1da177e4 LT |
1296 | } |
1297 | ||
1298 | /** | |
3144581c | 1299 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1300 | * @dev: virtual device associated with tunnel |
1301 | * @new_mtu: the new mtu | |
1302 | * | |
1303 | * Return: | |
1304 | * 0 on success, | |
1305 | * %-EINVAL if mtu too small | |
1306 | **/ | |
1307 | ||
1308 | static int | |
3144581c | 1309 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1310 | { |
1311 | if (new_mtu < IPV6_MIN_MTU) { | |
1312 | return -EINVAL; | |
1313 | } | |
1314 | dev->mtu = new_mtu; | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | /** | |
3144581c | 1319 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1320 | * @dev: virtual device associated with tunnel |
1321 | * | |
1322 | * Description: | |
1323 | * Initialize function pointers and device parameters | |
1324 | **/ | |
1325 | ||
3144581c | 1326 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1327 | { |
3144581c | 1328 | dev->uninit = ip6_tnl_dev_uninit; |
1da177e4 | 1329 | dev->destructor = free_netdev; |
61ec2aec | 1330 | dev->hard_start_xmit = ip6_tnl_xmit; |
3144581c YK |
1331 | dev->get_stats = ip6_tnl_get_stats; |
1332 | dev->do_ioctl = ip6_tnl_ioctl; | |
1333 | dev->change_mtu = ip6_tnl_change_mtu; | |
1da177e4 LT |
1334 | |
1335 | dev->type = ARPHRD_TUNNEL6; | |
1336 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1337 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1338 | dev->flags |= IFF_NOARP; | |
1339 | dev->addr_len = sizeof(struct in6_addr); | |
1340 | } | |
1341 | ||
1342 | ||
1343 | /** | |
3144581c | 1344 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1345 | * @dev: virtual device associated with tunnel |
1346 | **/ | |
1347 | ||
1348 | static inline void | |
3144581c | 1349 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1350 | { |
2941a486 | 1351 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1352 | t->dev = dev; |
1353 | strcpy(t->parms.name, dev->name); | |
1354 | } | |
1355 | ||
1356 | /** | |
3144581c | 1357 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1358 | * @dev: virtual device associated with tunnel |
1359 | **/ | |
1360 | ||
1361 | static int | |
3144581c | 1362 | ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1363 | { |
2941a486 | 1364 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1365 | ip6_tnl_dev_init_gen(dev); |
1366 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1367 | return 0; |
1368 | } | |
1369 | ||
1370 | /** | |
3144581c | 1371 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1372 | * @dev: fallback device |
1373 | * | |
1374 | * Return: 0 | |
1375 | **/ | |
1376 | ||
1ab1457c | 1377 | static int |
3144581c | 1378 | ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1379 | { |
2941a486 | 1380 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c | 1381 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1382 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 LT |
1383 | dev_hold(dev); |
1384 | tnls_wc[0] = t; | |
1385 | return 0; | |
1386 | } | |
1387 | ||
c4d3efaf YK |
1388 | static struct xfrm6_tunnel ip4ip6_handler = { |
1389 | .handler = ip4ip6_rcv, | |
1390 | .err_handler = ip4ip6_err, | |
1391 | .priority = 1, | |
1392 | }; | |
1393 | ||
1da177e4 | 1394 | static struct xfrm6_tunnel ip6ip6_handler = { |
0303770d PM |
1395 | .handler = ip6ip6_rcv, |
1396 | .err_handler = ip6ip6_err, | |
d2acc347 | 1397 | .priority = 1, |
1da177e4 LT |
1398 | }; |
1399 | ||
13eeb8e9 PE |
1400 | static int ip6_tnl_init_net(struct net *net) |
1401 | { | |
1402 | int err; | |
1403 | struct ip6_tnl_net *ip6n; | |
1404 | ||
1405 | err = -ENOMEM; | |
1406 | ip6n = kmalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL); | |
1407 | if (ip6n == NULL) | |
1408 | goto err_alloc; | |
1409 | ||
1410 | err = net_assign_generic(net, ip6_tnl_net_id, ip6n); | |
1411 | if (err < 0) | |
1412 | goto err_assign; | |
1413 | ||
15820e12 PE |
1414 | err = -ENOMEM; |
1415 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1416 | ip6_tnl_dev_setup); | |
1417 | ||
1418 | if (!ip6n->fb_tnl_dev) | |
1419 | goto err_alloc_dev; | |
1420 | ||
1421 | ip6n->fb_tnl_dev->init = ip6_fb_tnl_dev_init; | |
1422 | dev_net_set(ip6n->fb_tnl_dev, net); | |
1423 | ||
1424 | err = register_netdev(ip6n->fb_tnl_dev); | |
1425 | if (err < 0) | |
1426 | goto err_register; | |
13eeb8e9 PE |
1427 | return 0; |
1428 | ||
15820e12 PE |
1429 | err_register: |
1430 | free_netdev(ip6n->fb_tnl_dev); | |
1431 | err_alloc_dev: | |
1432 | /* nothing */ | |
13eeb8e9 PE |
1433 | err_assign: |
1434 | kfree(ip6n); | |
1435 | err_alloc: | |
1436 | return err; | |
1437 | } | |
1438 | ||
1439 | static void ip6_tnl_exit_net(struct net *net) | |
1440 | { | |
1441 | struct ip6_tnl_net *ip6n; | |
1442 | ||
1443 | ip6n = net_generic(net, ip6_tnl_net_id); | |
1444 | kfree(ip6n); | |
1445 | } | |
1446 | ||
1447 | static struct pernet_operations ip6_tnl_net_ops = { | |
1448 | .init = ip6_tnl_init_net, | |
1449 | .exit = ip6_tnl_exit_net, | |
1450 | }; | |
1451 | ||
1da177e4 LT |
1452 | /** |
1453 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1454 | * | |
1455 | * Return: 0 on success | |
1456 | **/ | |
1457 | ||
1458 | static int __init ip6_tunnel_init(void) | |
1459 | { | |
1460 | int err; | |
1461 | ||
c4d3efaf | 1462 | if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { |
3144581c | 1463 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
c4d3efaf YK |
1464 | err = -EAGAIN; |
1465 | goto out; | |
1466 | } | |
1467 | ||
73d605d1 | 1468 | if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { |
3144581c | 1469 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
c4d3efaf YK |
1470 | err = -EAGAIN; |
1471 | goto unreg_ip4ip6; | |
1da177e4 | 1472 | } |
13eeb8e9 PE |
1473 | |
1474 | err = register_pernet_gen_device(&ip6_tnl_net_id, &ip6_tnl_net_ops); | |
1475 | if (err < 0) | |
1476 | goto err_pernet; | |
1da177e4 | 1477 | return 0; |
13eeb8e9 | 1478 | err_pernet: |
73d605d1 | 1479 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
c4d3efaf YK |
1480 | unreg_ip4ip6: |
1481 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); | |
1482 | out: | |
1da177e4 LT |
1483 | return err; |
1484 | } | |
1485 | ||
3144581c | 1486 | static void __exit ip6_tnl_destroy_tunnels(void) |
b3fdd9f1 YK |
1487 | { |
1488 | int h; | |
1489 | struct ip6_tnl *t; | |
1490 | ||
1491 | for (h = 0; h < HASH_SIZE; h++) { | |
1492 | while ((t = tnls_r_l[h]) != NULL) | |
1493 | unregister_netdevice(t->dev); | |
1494 | } | |
1495 | ||
1496 | t = tnls_wc[0]; | |
1497 | unregister_netdevice(t->dev); | |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | /** |
1501 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1502 | **/ | |
1503 | ||
1504 | static void __exit ip6_tunnel_cleanup(void) | |
1505 | { | |
c4d3efaf | 1506 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1507 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1508 | |
73d605d1 | 1509 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1510 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1511 | |
b3fdd9f1 | 1512 | rtnl_lock(); |
3144581c | 1513 | ip6_tnl_destroy_tunnels(); |
b3fdd9f1 | 1514 | rtnl_unlock(); |
13eeb8e9 PE |
1515 | |
1516 | unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops); | |
1da177e4 LT |
1517 | } |
1518 | ||
1519 | module_init(ip6_tunnel_init); | |
1520 | module_exit(ip6_tunnel_cleanup); |