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 | 8 | * |
1da177e4 | 9 | * Based on: |
c4d3efaf | 10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
11 | * |
12 | * RFC 2473 | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
1da177e4 | 21 | #include <linux/module.h> |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/errno.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/sockios.h> | |
c4d3efaf | 26 | #include <linux/icmp.h> |
1da177e4 LT |
27 | #include <linux/if.h> |
28 | #include <linux/in.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/if_tunnel.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/in6.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <linux/icmpv6.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/rtnetlink.h> | |
39 | #include <linux/netfilter_ipv6.h> | |
40 | ||
41 | #include <asm/uaccess.h> | |
42 | #include <asm/atomic.h> | |
43 | ||
c4d3efaf | 44 | #include <net/icmp.h> |
1da177e4 LT |
45 | #include <net/ip.h> |
46 | #include <net/ipv6.h> | |
1da177e4 LT |
47 | #include <net/ip6_route.h> |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip6_tunnel.h> | |
50 | #include <net/xfrm.h> | |
51 | #include <net/dsfield.h> | |
52 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
53 | #include <net/net_namespace.h> |
54 | #include <net/netns/generic.h> | |
1da177e4 LT |
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 | |
0dc47877 | 63 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
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 | |
1326c3d5 SH |
77 | static void ip6_fb_tnl_dev_init(struct net_device *dev); |
78 | static void ip6_tnl_dev_init(struct net_device *dev); | |
3144581c | 79 | static void ip6_tnl_dev_setup(struct net_device *dev); |
1da177e4 | 80 | |
13eeb8e9 PE |
81 | static int ip6_tnl_net_id; |
82 | struct ip6_tnl_net { | |
15820e12 PE |
83 | /* the IPv6 tunnel fallback device */ |
84 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 PE |
85 | /* lists for storing tunnels in use */ |
86 | struct ip6_tnl *tnls_r_l[HASH_SIZE]; | |
87 | struct ip6_tnl *tnls_wc[1]; | |
88 | struct ip6_tnl **tnls[2]; | |
13eeb8e9 PE |
89 | }; |
90 | ||
1da177e4 | 91 | /* lock for the tunnel lists */ |
3144581c | 92 | static DEFINE_RWLOCK(ip6_tnl_lock); |
1da177e4 LT |
93 | |
94 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
95 | { | |
96 | struct dst_entry *dst = t->dst_cache; | |
97 | ||
1ab1457c | 98 | if (dst && dst->obsolete && |
1da177e4 LT |
99 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
100 | t->dst_cache = NULL; | |
101 | dst_release(dst); | |
102 | return NULL; | |
103 | } | |
104 | ||
105 | return dst; | |
106 | } | |
107 | ||
108 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
109 | { | |
110 | dst_release(t->dst_cache); | |
111 | t->dst_cache = NULL; | |
112 | } | |
113 | ||
114 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
115 | { | |
116 | struct rt6_info *rt = (struct rt6_info *) dst; | |
117 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
118 | dst_release(t->dst_cache); | |
119 | t->dst_cache = dst; | |
120 | } | |
121 | ||
122 | /** | |
3144581c | 123 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
124 | * @remote: the address of the tunnel exit-point |
125 | * @local: the address of the tunnel entry-point | |
1da177e4 | 126 | * |
1ab1457c | 127 | * Return: |
1da177e4 | 128 | * tunnel matching given end-points if found, |
1ab1457c | 129 | * else fallback tunnel if its device is up, |
1da177e4 LT |
130 | * else %NULL |
131 | **/ | |
132 | ||
133 | static struct ip6_tnl * | |
2dd02c89 | 134 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 LT |
135 | { |
136 | unsigned h0 = HASH(remote); | |
137 | unsigned h1 = HASH(local); | |
138 | struct ip6_tnl *t; | |
3e6c9fb5 | 139 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 140 | |
3e6c9fb5 | 141 | for (t = ip6n->tnls_r_l[h0 ^ h1]; t; t = t->next) { |
1da177e4 LT |
142 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
143 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
144 | (t->dev->flags & IFF_UP)) | |
145 | return t; | |
146 | } | |
3e6c9fb5 | 147 | if ((t = ip6n->tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
148 | return t; |
149 | ||
150 | return NULL; | |
151 | } | |
152 | ||
153 | /** | |
3144581c | 154 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 155 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
156 | * |
157 | * Description: | |
3144581c | 158 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
159 | * &struct in6_addr entries laddr and raddr in @p. |
160 | * | |
1ab1457c | 161 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
162 | **/ |
163 | ||
164 | static struct ip6_tnl ** | |
2dd02c89 | 165 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
166 | { |
167 | struct in6_addr *remote = &p->raddr; | |
168 | struct in6_addr *local = &p->laddr; | |
169 | unsigned h = 0; | |
170 | int prio = 0; | |
171 | ||
172 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
173 | prio = 1; | |
174 | h = HASH(remote) ^ HASH(local); | |
175 | } | |
3e6c9fb5 | 176 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
177 | } |
178 | ||
179 | /** | |
3144581c | 180 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
181 | * @t: tunnel to be added |
182 | **/ | |
183 | ||
184 | static void | |
2dd02c89 | 185 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 186 | { |
2dd02c89 | 187 | struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 LT |
188 | |
189 | t->next = *tp; | |
3144581c | 190 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 191 | *tp = t; |
3144581c | 192 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
193 | } |
194 | ||
195 | /** | |
3144581c | 196 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
197 | * @t: tunnel to be removed |
198 | **/ | |
199 | ||
200 | static void | |
2dd02c89 | 201 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 LT |
202 | { |
203 | struct ip6_tnl **tp; | |
204 | ||
2dd02c89 | 205 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { |
1da177e4 | 206 | if (t == *tp) { |
3144581c | 207 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 208 | *tp = t->next; |
3144581c | 209 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
210 | break; |
211 | } | |
212 | } | |
213 | } | |
214 | ||
215 | /** | |
216 | * ip6_tnl_create() - create a new tunnel | |
217 | * @p: tunnel parameters | |
218 | * @pt: pointer to new tunnel | |
219 | * | |
220 | * Description: | |
221 | * Create tunnel matching given parameters. | |
1ab1457c YH |
222 | * |
223 | * Return: | |
567131a7 | 224 | * created tunnel or NULL |
1da177e4 LT |
225 | **/ |
226 | ||
2dd02c89 | 227 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
228 | { |
229 | struct net_device *dev; | |
230 | struct ip6_tnl *t; | |
231 | char name[IFNAMSIZ]; | |
232 | int err; | |
2dd02c89 | 233 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 234 | |
34cc7ba6 | 235 | if (p->name[0]) |
1da177e4 | 236 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
237 | else |
238 | sprintf(name, "ip6tnl%%d"); | |
239 | ||
3144581c | 240 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 241 | if (dev == NULL) |
567131a7 | 242 | goto failed; |
1da177e4 | 243 | |
554eb277 PE |
244 | dev_net_set(dev, net); |
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); |
1326c3d5 | 252 | ip6_tnl_dev_init(dev); |
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); |
3e6c9fb5 | 317 | ip6n->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; | |
2f7f54b7 | 546 | if (ip_route_output_key(dev_net(skb->dev), &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; | |
2f7f54b7 | 558 | if (ip_route_output_key(dev_net(skb->dev), &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 */ | |
2f7f54b7 PE |
615 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
616 | NULL, 0, 0); | |
1da177e4 LT |
617 | |
618 | if (rt && rt->rt6i_dev) | |
619 | skb2->dev = rt->rt6i_dev; | |
620 | ||
621 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
622 | ||
623 | if (rt) | |
624 | dst_release(&rt->u.dst); | |
625 | ||
626 | kfree_skb(skb2); | |
627 | } | |
e490d1d8 YK |
628 | |
629 | return 0; | |
1da177e4 LT |
630 | } |
631 | ||
c4d3efaf YK |
632 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
633 | struct ipv6hdr *ipv6h, | |
634 | struct sk_buff *skb) | |
635 | { | |
636 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
637 | ||
638 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 639 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
640 | |
641 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 642 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
643 | } |
644 | ||
8359925b YK |
645 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
646 | struct ipv6hdr *ipv6h, | |
647 | struct sk_buff *skb) | |
1da177e4 | 648 | { |
8359925b | 649 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 650 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 651 | |
8359925b | 652 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 653 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 654 | } |
8359925b | 655 | |
09c6bbf0 VN |
656 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
657 | { | |
658 | struct ip6_tnl_parm *p = &t->parms; | |
659 | int ret = 0; | |
2f7f54b7 | 660 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
661 | |
662 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 663 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
664 | |
665 | if (p->link) | |
2f7f54b7 | 666 | ldev = dev_get_by_index(net, p->link); |
09c6bbf0 VN |
667 | |
668 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
669 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
670 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
671 | ret = 1; |
672 | ||
673 | if (ldev) | |
674 | dev_put(ldev); | |
675 | } | |
676 | return ret; | |
677 | } | |
1da177e4 LT |
678 | |
679 | /** | |
3144581c | 680 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 681 | * @skb: received socket buffer |
8359925b YK |
682 | * @protocol: ethernet protocol ID |
683 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
684 | * |
685 | * Return: 0 | |
686 | **/ | |
687 | ||
8359925b | 688 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 689 | __u8 ipproto, |
8359925b YK |
690 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
691 | struct ipv6hdr *ipv6h, | |
692 | struct sk_buff *skb)) | |
1da177e4 | 693 | { |
1da177e4 | 694 | struct ip6_tnl *t; |
0660e03f | 695 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 696 | |
3144581c | 697 | read_lock(&ip6_tnl_lock); |
1da177e4 | 698 | |
8704ca7e | 699 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 700 | &ipv6h->daddr)) != NULL) { |
502b0935 YK |
701 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
702 | read_unlock(&ip6_tnl_lock); | |
703 | goto discard; | |
704 | } | |
705 | ||
1da177e4 | 706 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
3144581c | 707 | read_unlock(&ip6_tnl_lock); |
50fba2aa | 708 | goto discard; |
1da177e4 LT |
709 | } |
710 | ||
09c6bbf0 | 711 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 712 | t->dev->stats.rx_dropped++; |
3144581c | 713 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
714 | goto discard; |
715 | } | |
716 | secpath_reset(skb); | |
b0e380b1 | 717 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 718 | skb_reset_network_header(skb); |
8359925b | 719 | skb->protocol = htons(protocol); |
1da177e4 LT |
720 | skb->pkt_type = PACKET_HOST; |
721 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
722 | skb->dev = t->dev; | |
723 | dst_release(skb->dst); | |
724 | skb->dst = NULL; | |
53ab61c6 | 725 | nf_reset(skb); |
8359925b YK |
726 | |
727 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
728 | ||
3dca02af PE |
729 | t->dev->stats.rx_packets++; |
730 | t->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 731 | netif_rx(skb); |
3144581c | 732 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
733 | return 0; |
734 | } | |
3144581c | 735 | read_unlock(&ip6_tnl_lock); |
1da177e4 | 736 | return 1; |
50fba2aa HX |
737 | |
738 | discard: | |
739 | kfree_skb(skb); | |
740 | return 0; | |
1da177e4 LT |
741 | } |
742 | ||
c4d3efaf YK |
743 | static int ip4ip6_rcv(struct sk_buff *skb) |
744 | { | |
502b0935 YK |
745 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
746 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
747 | } |
748 | ||
8359925b YK |
749 | static int ip6ip6_rcv(struct sk_buff *skb) |
750 | { | |
502b0935 YK |
751 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
752 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
753 | } |
754 | ||
6fb32dde VN |
755 | struct ipv6_tel_txoption { |
756 | struct ipv6_txoptions ops; | |
757 | __u8 dst_opt[8]; | |
758 | }; | |
1da177e4 | 759 | |
6fb32dde VN |
760 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
761 | { | |
762 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 763 | |
6fb32dde VN |
764 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
765 | opt->dst_opt[3] = 1; | |
766 | opt->dst_opt[4] = encap_limit; | |
767 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
768 | opt->dst_opt[6] = 1; | |
1da177e4 | 769 | |
6fb32dde VN |
770 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
771 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
772 | } |
773 | ||
774 | /** | |
3144581c | 775 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 776 | * @t: the outgoing tunnel device |
1ab1457c | 777 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
778 | * |
779 | * Description: | |
1ab1457c | 780 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
781 | * doesn't match source of incoming packet. |
782 | * | |
1ab1457c | 783 | * Return: |
1da177e4 LT |
784 | * 1 if conflict, |
785 | * 0 else | |
786 | **/ | |
787 | ||
788 | static inline int | |
3144581c | 789 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
790 | { |
791 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
792 | } | |
793 | ||
09c6bbf0 VN |
794 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
795 | { | |
796 | struct ip6_tnl_parm *p = &t->parms; | |
797 | int ret = 0; | |
2f7f54b7 | 798 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 799 | |
1ab1457c | 800 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
801 | struct net_device *ldev = NULL; |
802 | ||
803 | if (p->link) | |
2f7f54b7 | 804 | ldev = dev_get_by_index(net, p->link); |
09c6bbf0 | 805 | |
2f7f54b7 | 806 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
807 | printk(KERN_WARNING |
808 | "%s xmit: Local address not yet configured!\n", | |
809 | p->name); | |
810 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 811 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
812 | printk(KERN_WARNING |
813 | "%s xmit: Routing loop! " | |
814 | "Remote address found on this node!\n", | |
815 | p->name); | |
816 | else | |
817 | ret = 1; | |
818 | if (ldev) | |
819 | dev_put(ldev); | |
820 | } | |
821 | return ret; | |
822 | } | |
1da177e4 | 823 | /** |
61ec2aec | 824 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 825 | * @skb: the outgoing socket buffer |
1ab1457c | 826 | * @dev: the outgoing tunnel device |
61ec2aec YK |
827 | * @dsfield: dscp code for outer header |
828 | * @fl: flow of tunneled packet | |
829 | * @encap_limit: encapsulation limit | |
830 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
831 | * |
832 | * Description: | |
833 | * Build new header and do some sanity checks on the packet before sending | |
834 | * it. | |
835 | * | |
1ab1457c | 836 | * Return: |
c4d3efaf | 837 | * 0 on success |
61ec2aec YK |
838 | * -1 fail |
839 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
840 | **/ |
841 | ||
61ec2aec YK |
842 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
843 | struct net_device *dev, | |
844 | __u8 dsfield, | |
845 | struct flowi *fl, | |
846 | int encap_limit, | |
847 | __u32 *pmtu) | |
1da177e4 | 848 | { |
2941a486 | 849 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 850 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 851 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 852 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
853 | struct dst_entry *dst; |
854 | struct net_device *tdev; | |
855 | int mtu; | |
c2636b4d | 856 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 857 | u8 proto; |
61ec2aec | 858 | int err = -1; |
1da177e4 | 859 | int pkt_len; |
1da177e4 | 860 | |
1da177e4 LT |
861 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
862 | dst_hold(dst); | |
a57ebc90 | 863 | else { |
2f7f54b7 | 864 | dst = ip6_route_output(dev_net(dev), NULL, fl); |
1da177e4 | 865 | |
61ec2aec | 866 | if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
867 | goto tx_err_link_failure; |
868 | } | |
1da177e4 LT |
869 | |
870 | tdev = dst->dev; | |
871 | ||
872 | if (tdev == dev) { | |
873 | stats->collisions++; | |
874 | if (net_ratelimit()) | |
1ab1457c | 875 | printk(KERN_WARNING |
1da177e4 LT |
876 | "%s: Local routing loop detected!\n", |
877 | t->parms.name); | |
878 | goto tx_err_dst_release; | |
879 | } | |
880 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 881 | if (encap_limit >= 0) { |
1da177e4 LT |
882 | max_headroom += 8; |
883 | mtu -= 8; | |
884 | } | |
885 | if (mtu < IPV6_MIN_MTU) | |
886 | mtu = IPV6_MIN_MTU; | |
26892058 YK |
887 | if (skb->dst) |
888 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
1da177e4 | 889 | if (skb->len > mtu) { |
61ec2aec YK |
890 | *pmtu = mtu; |
891 | err = -EMSGSIZE; | |
1da177e4 LT |
892 | goto tx_err_dst_release; |
893 | } | |
894 | ||
895 | /* | |
896 | * Okay, now see if we can stuff it in the buffer as-is. | |
897 | */ | |
898 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 899 | |
cfbba49d PM |
900 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
901 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 902 | struct sk_buff *new_skb; |
1ab1457c | 903 | |
1da177e4 LT |
904 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
905 | goto tx_err_dst_release; | |
906 | ||
907 | if (skb->sk) | |
908 | skb_set_owner_w(new_skb, skb->sk); | |
909 | kfree_skb(skb); | |
910 | skb = new_skb; | |
911 | } | |
912 | dst_release(skb->dst); | |
913 | skb->dst = dst_clone(dst); | |
914 | ||
b0e380b1 | 915 | skb->transport_header = skb->network_header; |
1da177e4 | 916 | |
61ec2aec | 917 | proto = fl->proto; |
6fb32dde VN |
918 | if (encap_limit >= 0) { |
919 | init_tel_txopt(&opt, encap_limit); | |
920 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
921 | } | |
e2d1bca7 ACM |
922 | skb_push(skb, sizeof(struct ipv6hdr)); |
923 | skb_reset_network_header(skb); | |
0660e03f | 924 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 925 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
926 | dsfield = INET_ECN_encapsulate(0, dsfield); |
927 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
928 | ipv6h->hop_limit = t->parms.hop_limit; |
929 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
930 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
931 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
932 | nf_reset(skb); |
933 | pkt_len = skb->len; | |
ef76bc23 | 934 | err = ip6_local_out(skb); |
1da177e4 | 935 | |
b9df3cb8 | 936 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
937 | stats->tx_bytes += pkt_len; |
938 | stats->tx_packets++; | |
939 | } else { | |
940 | stats->tx_errors++; | |
941 | stats->tx_aborted_errors++; | |
942 | } | |
943 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
944 | return 0; |
945 | tx_err_link_failure: | |
946 | stats->tx_carrier_errors++; | |
947 | dst_link_failure(skb); | |
948 | tx_err_dst_release: | |
949 | dst_release(dst); | |
61ec2aec YK |
950 | return err; |
951 | } | |
952 | ||
c4d3efaf YK |
953 | static inline int |
954 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
955 | { | |
956 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 957 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
958 | int encap_limit = -1; |
959 | struct flowi fl; | |
960 | __u8 dsfield; | |
961 | __u32 mtu; | |
962 | int err; | |
963 | ||
502b0935 YK |
964 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
965 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
966 | return -1; |
967 | ||
968 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
969 | encap_limit = t->parms.encap_limit; | |
970 | ||
971 | memcpy(&fl, &t->fl, sizeof (fl)); | |
972 | fl.proto = IPPROTO_IPIP; | |
973 | ||
974 | dsfield = ipv4_get_dsfield(iph); | |
975 | ||
976 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
977 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
978 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
979 | |
980 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
981 | if (err != 0) { | |
982 | /* XXX: send ICMP error even if DF is not set. */ | |
983 | if (err == -EMSGSIZE) | |
984 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
985 | htonl(mtu)); | |
986 | return -1; | |
987 | } | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
61ec2aec YK |
992 | static inline int |
993 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
994 | { | |
995 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 996 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
997 | int encap_limit = -1; |
998 | __u16 offset; | |
999 | struct flowi fl; | |
1000 | __u8 dsfield; | |
1001 | __u32 mtu; | |
1002 | int err; | |
1003 | ||
502b0935 YK |
1004 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1005 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1006 | return -1; |
1007 | ||
d56f90a7 ACM |
1008 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1009 | if (offset > 0) { | |
61ec2aec | 1010 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1011 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1012 | if (tel->encap_limit == 0) { |
1013 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
1014 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
1015 | return -1; | |
1016 | } | |
1017 | encap_limit = tel->encap_limit - 1; | |
1018 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1019 | encap_limit = t->parms.encap_limit; | |
1020 | ||
1021 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1022 | fl.proto = IPPROTO_IPV6; | |
1023 | ||
1024 | dsfield = ipv6_get_dsfield(ipv6h); | |
1025 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1026 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1027 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1028 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1029 | ||
1030 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1031 | if (err != 0) { | |
1032 | if (err == -EMSGSIZE) | |
1033 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
1034 | return -1; | |
1035 | } | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static int | |
1041 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1042 | { | |
1043 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1044 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1045 | int ret; |
1046 | ||
1047 | if (t->recursion++) { | |
3dca02af | 1048 | stats->collisions++; |
61ec2aec YK |
1049 | goto tx_err; |
1050 | } | |
1051 | ||
1052 | switch (skb->protocol) { | |
60678040 | 1053 | case htons(ETH_P_IP): |
c4d3efaf YK |
1054 | ret = ip4ip6_tnl_xmit(skb, dev); |
1055 | break; | |
60678040 | 1056 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1057 | ret = ip6ip6_tnl_xmit(skb, dev); |
1058 | break; | |
1059 | default: | |
1060 | goto tx_err; | |
1061 | } | |
1062 | ||
1063 | if (ret < 0) | |
1064 | goto tx_err; | |
1065 | ||
1066 | t->recursion--; | |
1067 | return 0; | |
1068 | ||
1da177e4 LT |
1069 | tx_err: |
1070 | stats->tx_errors++; | |
1071 | stats->tx_dropped++; | |
1072 | kfree_skb(skb); | |
1073 | t->recursion--; | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1078 | { | |
1079 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1080 | int ltype = ipv6_addr_type(&p->laddr); |
1081 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1082 | |
1083 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1084 | ||
09c6bbf0 VN |
1085 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1086 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1087 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1088 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1089 | if (ltype&IPV6_ADDR_UNICAST) |
1090 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1091 | if (rtype&IPV6_ADDR_UNICAST) | |
1092 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1093 | } |
1094 | } | |
1095 | ||
3144581c | 1096 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1097 | { |
1098 | struct net_device *dev = t->dev; | |
1099 | struct ip6_tnl_parm *p = &t->parms; | |
1100 | struct flowi *fl = &t->fl; | |
1101 | ||
1102 | memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
1103 | memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1104 | ||
1105 | /* Set up flowi template */ | |
1106 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1107 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1108 | fl->oif = p->link; | |
1109 | fl->fl6_flowlabel = 0; | |
1110 | ||
1111 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1112 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1113 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1114 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1115 | ||
1116 | ip6_tnl_set_cap(t); | |
1117 | ||
1118 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1119 | dev->flags |= IFF_POINTOPOINT; | |
1120 | else | |
1121 | dev->flags &= ~IFF_POINTOPOINT; | |
1122 | ||
1123 | dev->iflink = p->link; | |
1124 | ||
1125 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1126 | int strict = (ipv6_addr_type(&p->raddr) & |
1127 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1128 | ||
2f7f54b7 PE |
1129 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1130 | &p->raddr, &p->laddr, | |
305d4b3c | 1131 | p->link, strict); |
1da177e4 LT |
1132 | |
1133 | if (rt == NULL) | |
1134 | return; | |
1135 | ||
1136 | if (rt->rt6i_dev) { | |
1137 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1138 | sizeof (struct ipv6hdr); | |
1139 | ||
1140 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1141 | ||
1142 | if (dev->mtu < IPV6_MIN_MTU) | |
1143 | dev->mtu = IPV6_MIN_MTU; | |
1144 | } | |
1145 | dst_release(&rt->u.dst); | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | /** | |
3144581c | 1150 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1151 | * @t: tunnel to be changed |
1152 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1153 | * |
1154 | * Description: | |
3144581c | 1155 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1156 | **/ |
1157 | ||
1158 | static int | |
3144581c | 1159 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1160 | { |
1161 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1162 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1163 | t->parms.flags = p->flags; | |
1164 | t->parms.hop_limit = p->hop_limit; | |
1165 | t->parms.encap_limit = p->encap_limit; | |
1166 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1167 | t->parms.link = p->link; |
502b0935 | 1168 | t->parms.proto = p->proto; |
0c088890 | 1169 | ip6_tnl_dst_reset(t); |
3144581c | 1170 | ip6_tnl_link_config(t); |
1da177e4 LT |
1171 | return 0; |
1172 | } | |
1173 | ||
1174 | /** | |
3144581c | 1175 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1176 | * @dev: virtual device associated with tunnel |
1177 | * @ifr: parameters passed from userspace | |
1178 | * @cmd: command to be performed | |
1179 | * | |
1180 | * Description: | |
3144581c | 1181 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1182 | * from userspace. |
1da177e4 LT |
1183 | * |
1184 | * The possible commands are the following: | |
1185 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1186 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1187 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1188 | * %SIOCDELTUNNEL: delete tunnel | |
1189 | * | |
1ab1457c | 1190 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1191 | * initialization, can be used for creating other tunnel devices. |
1192 | * | |
1193 | * Return: | |
1194 | * 0 on success, | |
1195 | * %-EFAULT if unable to copy data to or from userspace, | |
1196 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1197 | * %-EINVAL if passed tunnel parameters are invalid, | |
1198 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1199 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1200 | **/ | |
1201 | ||
1202 | static int | |
3144581c | 1203 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1204 | { |
1205 | int err = 0; | |
1da177e4 LT |
1206 | struct ip6_tnl_parm p; |
1207 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1208 | struct net *net = dev_net(dev); |
1209 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1210 | |
1211 | switch (cmd) { | |
1212 | case SIOCGETTUNNEL: | |
15820e12 | 1213 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1214 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1215 | err = -EFAULT; |
1216 | break; | |
1217 | } | |
2dd02c89 | 1218 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1219 | } |
1220 | if (t == NULL) | |
2941a486 | 1221 | t = netdev_priv(dev); |
1da177e4 LT |
1222 | memcpy(&p, &t->parms, sizeof (p)); |
1223 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1224 | err = -EFAULT; | |
1225 | } | |
1226 | break; | |
1227 | case SIOCADDTUNNEL: | |
1228 | case SIOCCHGTUNNEL: | |
1229 | err = -EPERM; | |
1da177e4 LT |
1230 | if (!capable(CAP_NET_ADMIN)) |
1231 | break; | |
567131a7 VN |
1232 | err = -EFAULT; |
1233 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1234 | break; |
567131a7 | 1235 | err = -EINVAL; |
502b0935 YK |
1236 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1237 | p.proto != 0) | |
1da177e4 | 1238 | break; |
2dd02c89 | 1239 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1240 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1241 | if (t != NULL) { |
1242 | if (t->dev != dev) { | |
1243 | err = -EEXIST; | |
1244 | break; | |
1245 | } | |
1246 | } else | |
1247 | t = netdev_priv(dev); | |
1248 | ||
2dd02c89 | 1249 | ip6_tnl_unlink(ip6n, t); |
3144581c | 1250 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1251 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1252 | netdev_state_change(dev); |
1253 | } | |
567131a7 | 1254 | if (t) { |
1da177e4 | 1255 | err = 0; |
567131a7 VN |
1256 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1257 | err = -EFAULT; | |
1258 | ||
1259 | } else | |
1260 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1261 | break; |
1262 | case SIOCDELTUNNEL: | |
1263 | err = -EPERM; | |
1264 | if (!capable(CAP_NET_ADMIN)) | |
1265 | break; | |
1266 | ||
15820e12 | 1267 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1268 | err = -EFAULT; |
1269 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1270 | break; |
567131a7 | 1271 | err = -ENOENT; |
2dd02c89 | 1272 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1273 | break; |
567131a7 | 1274 | err = -EPERM; |
15820e12 | 1275 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1276 | break; |
567131a7 | 1277 | dev = t->dev; |
1da177e4 | 1278 | } |
22f8cde5 SH |
1279 | err = 0; |
1280 | unregister_netdevice(dev); | |
1da177e4 LT |
1281 | break; |
1282 | default: | |
1283 | err = -EINVAL; | |
1284 | } | |
1285 | return err; | |
1286 | } | |
1287 | ||
1da177e4 | 1288 | /** |
3144581c | 1289 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1290 | * @dev: virtual device associated with tunnel |
1291 | * @new_mtu: the new mtu | |
1292 | * | |
1293 | * Return: | |
1294 | * 0 on success, | |
1295 | * %-EINVAL if mtu too small | |
1296 | **/ | |
1297 | ||
1298 | static int | |
3144581c | 1299 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1300 | { |
1301 | if (new_mtu < IPV6_MIN_MTU) { | |
1302 | return -EINVAL; | |
1303 | } | |
1304 | dev->mtu = new_mtu; | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1326c3d5 SH |
1308 | |
1309 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
1310 | .ndo_uninit = ip6_tnl_dev_uninit, | |
1311 | .ndo_start_xmit = ip6_tnl_xmit, | |
1312 | .ndo_do_ioctl = ip6_tnl_ioctl, | |
1313 | .ndo_change_mtu = ip6_tnl_change_mtu, | |
1314 | }; | |
1315 | ||
1da177e4 | 1316 | /** |
3144581c | 1317 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1318 | * @dev: virtual device associated with tunnel |
1319 | * | |
1320 | * Description: | |
1321 | * Initialize function pointers and device parameters | |
1322 | **/ | |
1323 | ||
3144581c | 1324 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1325 | { |
1326c3d5 | 1326 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
1da177e4 | 1327 | dev->destructor = free_netdev; |
1da177e4 LT |
1328 | |
1329 | dev->type = ARPHRD_TUNNEL6; | |
1330 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1331 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1332 | dev->flags |= IFF_NOARP; | |
1333 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1334 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1335 | } |
1336 | ||
1337 | ||
1338 | /** | |
3144581c | 1339 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1340 | * @dev: virtual device associated with tunnel |
1341 | **/ | |
1342 | ||
1343 | static inline void | |
3144581c | 1344 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1345 | { |
2941a486 | 1346 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1347 | t->dev = dev; |
1348 | strcpy(t->parms.name, dev->name); | |
1349 | } | |
1350 | ||
1351 | /** | |
3144581c | 1352 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1353 | * @dev: virtual device associated with tunnel |
1354 | **/ | |
1355 | ||
1326c3d5 | 1356 | static void ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1357 | { |
2941a486 | 1358 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1359 | ip6_tnl_dev_init_gen(dev); |
1360 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1361 | } |
1362 | ||
1363 | /** | |
3144581c | 1364 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1365 | * @dev: fallback device |
1366 | * | |
1367 | * Return: 0 | |
1368 | **/ | |
1369 | ||
1326c3d5 | 1370 | static void ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1371 | { |
2941a486 | 1372 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1373 | struct net *net = dev_net(dev); |
1374 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1375 | ||
3144581c | 1376 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1377 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1378 | dev_hold(dev); |
3e6c9fb5 | 1379 | ip6n->tnls_wc[0] = t; |
1da177e4 LT |
1380 | } |
1381 | ||
c4d3efaf YK |
1382 | static struct xfrm6_tunnel ip4ip6_handler = { |
1383 | .handler = ip4ip6_rcv, | |
1384 | .err_handler = ip4ip6_err, | |
1385 | .priority = 1, | |
1386 | }; | |
1387 | ||
1da177e4 | 1388 | static struct xfrm6_tunnel ip6ip6_handler = { |
0303770d PM |
1389 | .handler = ip6ip6_rcv, |
1390 | .err_handler = ip6ip6_err, | |
d2acc347 | 1391 | .priority = 1, |
1da177e4 LT |
1392 | }; |
1393 | ||
3e6c9fb5 PE |
1394 | static void ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
1395 | { | |
1396 | int h; | |
1397 | struct ip6_tnl *t; | |
1398 | ||
1399 | for (h = 0; h < HASH_SIZE; h++) { | |
1400 | while ((t = ip6n->tnls_r_l[h]) != NULL) | |
1401 | unregister_netdevice(t->dev); | |
1402 | } | |
1403 | ||
1404 | t = ip6n->tnls_wc[0]; | |
1405 | unregister_netdevice(t->dev); | |
1406 | } | |
1407 | ||
13eeb8e9 PE |
1408 | static int ip6_tnl_init_net(struct net *net) |
1409 | { | |
1410 | int err; | |
1411 | struct ip6_tnl_net *ip6n; | |
1412 | ||
1413 | err = -ENOMEM; | |
3e6c9fb5 | 1414 | ip6n = kzalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL); |
13eeb8e9 PE |
1415 | if (ip6n == NULL) |
1416 | goto err_alloc; | |
1417 | ||
1418 | err = net_assign_generic(net, ip6_tnl_net_id, ip6n); | |
1419 | if (err < 0) | |
1420 | goto err_assign; | |
1421 | ||
3e6c9fb5 PE |
1422 | ip6n->tnls[0] = ip6n->tnls_wc; |
1423 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1424 | ||
15820e12 PE |
1425 | err = -ENOMEM; |
1426 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1427 | ip6_tnl_dev_setup); | |
1428 | ||
1429 | if (!ip6n->fb_tnl_dev) | |
1430 | goto err_alloc_dev; | |
be77e593 | 1431 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1432 | |
1326c3d5 | 1433 | ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
15820e12 PE |
1434 | |
1435 | err = register_netdev(ip6n->fb_tnl_dev); | |
1436 | if (err < 0) | |
1437 | goto err_register; | |
13eeb8e9 PE |
1438 | return 0; |
1439 | ||
15820e12 PE |
1440 | err_register: |
1441 | free_netdev(ip6n->fb_tnl_dev); | |
1442 | err_alloc_dev: | |
1443 | /* nothing */ | |
13eeb8e9 PE |
1444 | err_assign: |
1445 | kfree(ip6n); | |
1446 | err_alloc: | |
1447 | return err; | |
1448 | } | |
1449 | ||
1450 | static void ip6_tnl_exit_net(struct net *net) | |
1451 | { | |
1452 | struct ip6_tnl_net *ip6n; | |
1453 | ||
1454 | ip6n = net_generic(net, ip6_tnl_net_id); | |
3e6c9fb5 PE |
1455 | rtnl_lock(); |
1456 | ip6_tnl_destroy_tunnels(ip6n); | |
1457 | rtnl_unlock(); | |
13eeb8e9 PE |
1458 | kfree(ip6n); |
1459 | } | |
1460 | ||
1461 | static struct pernet_operations ip6_tnl_net_ops = { | |
1462 | .init = ip6_tnl_init_net, | |
1463 | .exit = ip6_tnl_exit_net, | |
1464 | }; | |
1465 | ||
1da177e4 LT |
1466 | /** |
1467 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1468 | * | |
1469 | * Return: 0 on success | |
1470 | **/ | |
1471 | ||
1472 | static int __init ip6_tunnel_init(void) | |
1473 | { | |
1474 | int err; | |
1475 | ||
c4d3efaf | 1476 | if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { |
3144581c | 1477 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
c4d3efaf YK |
1478 | err = -EAGAIN; |
1479 | goto out; | |
1480 | } | |
1481 | ||
73d605d1 | 1482 | if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { |
3144581c | 1483 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
c4d3efaf YK |
1484 | err = -EAGAIN; |
1485 | goto unreg_ip4ip6; | |
1da177e4 | 1486 | } |
13eeb8e9 PE |
1487 | |
1488 | err = register_pernet_gen_device(&ip6_tnl_net_id, &ip6_tnl_net_ops); | |
1489 | if (err < 0) | |
1490 | goto err_pernet; | |
1da177e4 | 1491 | return 0; |
13eeb8e9 | 1492 | err_pernet: |
73d605d1 | 1493 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
c4d3efaf YK |
1494 | unreg_ip4ip6: |
1495 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); | |
1496 | out: | |
1da177e4 LT |
1497 | return err; |
1498 | } | |
1499 | ||
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 | |
13eeb8e9 | 1512 | unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops); |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | module_init(ip6_tunnel_init); | |
1516 | module_exit(ip6_tunnel_cleanup); |