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 | |
f99189b1 | 81 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 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 | ||
2922bc8a ED |
91 | /* |
92 | * Locking : hash tables are protected by RCU and a spinlock | |
93 | */ | |
94 | static DEFINE_SPINLOCK(ip6_tnl_lock); | |
1da177e4 LT |
95 | |
96 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
97 | { | |
98 | struct dst_entry *dst = t->dst_cache; | |
99 | ||
1ab1457c | 100 | if (dst && dst->obsolete && |
1da177e4 LT |
101 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
102 | t->dst_cache = NULL; | |
103 | dst_release(dst); | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | return dst; | |
108 | } | |
109 | ||
110 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
111 | { | |
112 | dst_release(t->dst_cache); | |
113 | t->dst_cache = NULL; | |
114 | } | |
115 | ||
116 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
117 | { | |
118 | struct rt6_info *rt = (struct rt6_info *) dst; | |
119 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
120 | dst_release(t->dst_cache); | |
121 | t->dst_cache = dst; | |
122 | } | |
123 | ||
124 | /** | |
3144581c | 125 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
126 | * @remote: the address of the tunnel exit-point |
127 | * @local: the address of the tunnel entry-point | |
1da177e4 | 128 | * |
1ab1457c | 129 | * Return: |
1da177e4 | 130 | * tunnel matching given end-points if found, |
1ab1457c | 131 | * else fallback tunnel if its device is up, |
1da177e4 LT |
132 | * else %NULL |
133 | **/ | |
134 | ||
2922bc8a ED |
135 | #define for_each_ip6_tunnel_rcu(start) \ |
136 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
137 | ||
1da177e4 | 138 | static struct ip6_tnl * |
2dd02c89 | 139 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 LT |
140 | { |
141 | unsigned h0 = HASH(remote); | |
142 | unsigned h1 = HASH(local); | |
143 | struct ip6_tnl *t; | |
3e6c9fb5 | 144 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 145 | |
2922bc8a | 146 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
147 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
148 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
149 | (t->dev->flags & IFF_UP)) | |
150 | return t; | |
151 | } | |
2922bc8a ED |
152 | t = rcu_dereference(ip6n->tnls_wc[0]); |
153 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
154 | return t; |
155 | ||
156 | return NULL; | |
157 | } | |
158 | ||
159 | /** | |
3144581c | 160 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 161 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
162 | * |
163 | * Description: | |
3144581c | 164 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
165 | * &struct in6_addr entries laddr and raddr in @p. |
166 | * | |
1ab1457c | 167 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
168 | **/ |
169 | ||
170 | static struct ip6_tnl ** | |
2dd02c89 | 171 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
172 | { |
173 | struct in6_addr *remote = &p->raddr; | |
174 | struct in6_addr *local = &p->laddr; | |
175 | unsigned h = 0; | |
176 | int prio = 0; | |
177 | ||
178 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
179 | prio = 1; | |
180 | h = HASH(remote) ^ HASH(local); | |
181 | } | |
3e6c9fb5 | 182 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
183 | } |
184 | ||
185 | /** | |
3144581c | 186 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
187 | * @t: tunnel to be added |
188 | **/ | |
189 | ||
190 | static void | |
2dd02c89 | 191 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 192 | { |
2dd02c89 | 193 | struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 194 | |
2922bc8a | 195 | spin_lock_bh(&ip6_tnl_lock); |
1da177e4 | 196 | t->next = *tp; |
2922bc8a ED |
197 | rcu_assign_pointer(*tp, t); |
198 | spin_unlock_bh(&ip6_tnl_lock); | |
1da177e4 LT |
199 | } |
200 | ||
201 | /** | |
3144581c | 202 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
203 | * @t: tunnel to be removed |
204 | **/ | |
205 | ||
206 | static void | |
2dd02c89 | 207 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 LT |
208 | { |
209 | struct ip6_tnl **tp; | |
210 | ||
2dd02c89 | 211 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { |
1da177e4 | 212 | if (t == *tp) { |
2922bc8a | 213 | spin_lock_bh(&ip6_tnl_lock); |
1da177e4 | 214 | *tp = t->next; |
2922bc8a | 215 | spin_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
216 | break; |
217 | } | |
218 | } | |
219 | } | |
220 | ||
221 | /** | |
222 | * ip6_tnl_create() - create a new tunnel | |
223 | * @p: tunnel parameters | |
224 | * @pt: pointer to new tunnel | |
225 | * | |
226 | * Description: | |
227 | * Create tunnel matching given parameters. | |
1ab1457c YH |
228 | * |
229 | * Return: | |
567131a7 | 230 | * created tunnel or NULL |
1da177e4 LT |
231 | **/ |
232 | ||
2dd02c89 | 233 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
234 | { |
235 | struct net_device *dev; | |
236 | struct ip6_tnl *t; | |
237 | char name[IFNAMSIZ]; | |
238 | int err; | |
2dd02c89 | 239 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 240 | |
34cc7ba6 | 241 | if (p->name[0]) |
1da177e4 | 242 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
243 | else |
244 | sprintf(name, "ip6tnl%%d"); | |
245 | ||
3144581c | 246 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 247 | if (dev == NULL) |
567131a7 | 248 | goto failed; |
1da177e4 | 249 | |
554eb277 PE |
250 | dev_net_set(dev, net); |
251 | ||
b37d428b PE |
252 | if (strchr(name, '%')) { |
253 | if (dev_alloc_name(dev, name) < 0) | |
254 | goto failed_free; | |
255 | } | |
256 | ||
2941a486 | 257 | t = netdev_priv(dev); |
1da177e4 | 258 | t->parms = *p; |
20461c17 | 259 | ip6_tnl_dev_init(dev); |
1da177e4 | 260 | |
b37d428b PE |
261 | if ((err = register_netdevice(dev)) < 0) |
262 | goto failed_free; | |
263 | ||
1da177e4 | 264 | dev_hold(dev); |
2dd02c89 | 265 | ip6_tnl_link(ip6n, t); |
567131a7 | 266 | return t; |
b37d428b PE |
267 | |
268 | failed_free: | |
269 | free_netdev(dev); | |
567131a7 VN |
270 | failed: |
271 | return NULL; | |
1da177e4 LT |
272 | } |
273 | ||
274 | /** | |
3144581c | 275 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 276 | * @p: tunnel parameters |
1da177e4 LT |
277 | * @create: != 0 if allowed to create new tunnel if no match found |
278 | * | |
279 | * Description: | |
3144581c | 280 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
281 | * based on @parms. If this is unsuccessful, but @create is set a new |
282 | * tunnel device is created and registered for use. | |
283 | * | |
284 | * Return: | |
567131a7 | 285 | * matching tunnel or NULL |
1da177e4 LT |
286 | **/ |
287 | ||
2dd02c89 PE |
288 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
289 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
290 | { |
291 | struct in6_addr *remote = &p->raddr; | |
292 | struct in6_addr *local = &p->laddr; | |
293 | struct ip6_tnl *t; | |
2dd02c89 | 294 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 295 | |
2dd02c89 | 296 | for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) { |
1da177e4 | 297 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
298 | ipv6_addr_equal(remote, &t->parms.raddr)) |
299 | return t; | |
1da177e4 LT |
300 | } |
301 | if (!create) | |
567131a7 | 302 | return NULL; |
2dd02c89 | 303 | return ip6_tnl_create(net, p); |
1da177e4 LT |
304 | } |
305 | ||
306 | /** | |
3144581c | 307 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 308 | * @dev: the device to be destroyed |
1ab1457c | 309 | * |
1da177e4 | 310 | * Description: |
3144581c | 311 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
312 | **/ |
313 | ||
314 | static void | |
3144581c | 315 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 316 | { |
2941a486 | 317 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
318 | struct net *net = dev_net(dev); |
319 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 320 | |
15820e12 | 321 | if (dev == ip6n->fb_tnl_dev) { |
2922bc8a | 322 | spin_lock_bh(&ip6_tnl_lock); |
3e6c9fb5 | 323 | ip6n->tnls_wc[0] = NULL; |
2922bc8a | 324 | spin_unlock_bh(&ip6_tnl_lock); |
1da177e4 | 325 | } else { |
2dd02c89 | 326 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
327 | } |
328 | ip6_tnl_dst_reset(t); | |
329 | dev_put(dev); | |
330 | } | |
331 | ||
332 | /** | |
333 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
334 | * @skb: received socket buffer | |
335 | * | |
1ab1457c YH |
336 | * Return: |
337 | * 0 if none was found, | |
1da177e4 LT |
338 | * else index to encapsulation limit |
339 | **/ | |
340 | ||
341 | static __u16 | |
342 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
343 | { | |
344 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
345 | __u8 nexthdr = ipv6h->nexthdr; | |
346 | __u16 off = sizeof (*ipv6h); | |
347 | ||
348 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
349 | __u16 optlen = 0; | |
350 | struct ipv6_opt_hdr *hdr; | |
351 | if (raw + off + sizeof (*hdr) > skb->data && | |
352 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
353 | break; | |
354 | ||
355 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
356 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
357 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
358 | if (frag_hdr->frag_off) | |
359 | break; | |
360 | optlen = 8; | |
361 | } else if (nexthdr == NEXTHDR_AUTH) { | |
362 | optlen = (hdr->hdrlen + 2) << 2; | |
363 | } else { | |
364 | optlen = ipv6_optlen(hdr); | |
365 | } | |
366 | if (nexthdr == NEXTHDR_DEST) { | |
367 | __u16 i = off + 2; | |
368 | while (1) { | |
369 | struct ipv6_tlv_tnl_enc_lim *tel; | |
370 | ||
371 | /* No more room for encapsulation limit */ | |
372 | if (i + sizeof (*tel) > off + optlen) | |
373 | break; | |
374 | ||
375 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
376 | /* return index of option if found and valid */ | |
377 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
378 | tel->length == 1) | |
379 | return i; | |
380 | /* else jump to next option */ | |
381 | if (tel->type) | |
382 | i += tel->length + 2; | |
383 | else | |
384 | i++; | |
385 | } | |
386 | } | |
387 | nexthdr = hdr->nexthdr; | |
388 | off += optlen; | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
393 | /** | |
e490d1d8 | 394 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
395 | * |
396 | * Description: | |
e490d1d8 | 397 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
398 | * to the specifications in RFC 2473. |
399 | **/ | |
400 | ||
d2acc347 | 401 | static int |
502b0935 | 402 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 403 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
404 | { |
405 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
406 | struct ip6_tnl *t; | |
407 | int rel_msg = 0; | |
d5fdd6ba BH |
408 | u8 rel_type = ICMPV6_DEST_UNREACH; |
409 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
410 | __u32 rel_info = 0; |
411 | __u16 len; | |
d2acc347 | 412 | int err = -ENOENT; |
1da177e4 | 413 | |
1ab1457c YH |
414 | /* If the packet doesn't contain the original IPv6 header we are |
415 | in trouble since we might need the source address for further | |
1da177e4 LT |
416 | processing of the error. */ |
417 | ||
2922bc8a | 418 | rcu_read_lock(); |
8704ca7e | 419 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 420 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
421 | goto out; |
422 | ||
502b0935 YK |
423 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
424 | goto out; | |
425 | ||
d2acc347 HX |
426 | err = 0; |
427 | ||
e490d1d8 | 428 | switch (*type) { |
1da177e4 LT |
429 | __u32 teli; |
430 | struct ipv6_tlv_tnl_enc_lim *tel; | |
431 | __u32 mtu; | |
432 | case ICMPV6_DEST_UNREACH: | |
433 | if (net_ratelimit()) | |
434 | printk(KERN_WARNING | |
435 | "%s: Path to destination invalid " | |
436 | "or inactive!\n", t->parms.name); | |
437 | rel_msg = 1; | |
438 | break; | |
439 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 440 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
441 | if (net_ratelimit()) |
442 | printk(KERN_WARNING | |
443 | "%s: Too small hop limit or " | |
1ab1457c | 444 | "routing loop in tunnel!\n", |
1da177e4 LT |
445 | t->parms.name); |
446 | rel_msg = 1; | |
447 | } | |
448 | break; | |
449 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 450 | teli = 0; |
e490d1d8 | 451 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 452 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 453 | |
704eae1f | 454 | if (teli && teli == *info - 2) { |
1da177e4 LT |
455 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
456 | if (tel->encap_limit == 0) { | |
457 | if (net_ratelimit()) | |
458 | printk(KERN_WARNING | |
459 | "%s: Too small encapsulation " | |
460 | "limit or routing loop in " | |
461 | "tunnel!\n", t->parms.name); | |
462 | rel_msg = 1; | |
463 | } | |
107a5fe6 VN |
464 | } else if (net_ratelimit()) { |
465 | printk(KERN_WARNING | |
466 | "%s: Recipient unable to parse tunneled " | |
467 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
468 | } |
469 | break; | |
470 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 471 | mtu = *info - offset; |
1da177e4 LT |
472 | if (mtu < IPV6_MIN_MTU) |
473 | mtu = IPV6_MIN_MTU; | |
474 | t->dev->mtu = mtu; | |
475 | ||
cc6cdac0 | 476 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
477 | rel_type = ICMPV6_PKT_TOOBIG; |
478 | rel_code = 0; | |
479 | rel_info = mtu; | |
480 | rel_msg = 1; | |
481 | } | |
482 | break; | |
483 | } | |
e490d1d8 YK |
484 | |
485 | *type = rel_type; | |
486 | *code = rel_code; | |
487 | *info = rel_info; | |
488 | *msg = rel_msg; | |
489 | ||
490 | out: | |
2922bc8a | 491 | rcu_read_unlock(); |
e490d1d8 YK |
492 | return err; |
493 | } | |
494 | ||
c4d3efaf YK |
495 | static int |
496 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 497 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
498 | { |
499 | int rel_msg = 0; | |
d5fdd6ba BH |
500 | u8 rel_type = type; |
501 | u8 rel_code = code; | |
704eae1f | 502 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
503 | int err; |
504 | struct sk_buff *skb2; | |
505 | struct iphdr *eiph; | |
506 | struct flowi fl; | |
507 | struct rtable *rt; | |
508 | ||
502b0935 YK |
509 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
510 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
511 | if (err < 0) |
512 | return err; | |
513 | ||
514 | if (rel_msg == 0) | |
515 | return 0; | |
516 | ||
517 | switch (rel_type) { | |
518 | case ICMPV6_DEST_UNREACH: | |
519 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
520 | return 0; | |
521 | rel_type = ICMP_DEST_UNREACH; | |
522 | rel_code = ICMP_HOST_UNREACH; | |
523 | break; | |
524 | case ICMPV6_PKT_TOOBIG: | |
525 | if (rel_code != 0) | |
526 | return 0; | |
527 | rel_type = ICMP_DEST_UNREACH; | |
528 | rel_code = ICMP_FRAG_NEEDED; | |
529 | break; | |
530 | default: | |
531 | return 0; | |
532 | } | |
533 | ||
534 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
535 | return 0; | |
536 | ||
537 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
538 | if (!skb2) | |
539 | return 0; | |
540 | ||
adf30907 ED |
541 | skb_dst_drop(skb2); |
542 | ||
c4d3efaf | 543 | skb_pull(skb2, offset); |
c1d2bbe1 | 544 | skb_reset_network_header(skb2); |
eddc9ec5 | 545 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
546 | |
547 | /* Try to guess incoming interface */ | |
548 | memset(&fl, 0, sizeof(fl)); | |
549 | fl.fl4_dst = eiph->saddr; | |
550 | fl.fl4_tos = RT_TOS(eiph->tos); | |
551 | fl.proto = IPPROTO_IPIP; | |
2f7f54b7 | 552 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) |
c4d3efaf YK |
553 | goto out; |
554 | ||
555 | skb2->dev = rt->u.dst.dev; | |
556 | ||
557 | /* route "incoming" packet */ | |
558 | if (rt->rt_flags & RTCF_LOCAL) { | |
559 | ip_rt_put(rt); | |
560 | rt = NULL; | |
561 | fl.fl4_dst = eiph->daddr; | |
562 | fl.fl4_src = eiph->saddr; | |
563 | fl.fl4_tos = eiph->tos; | |
2f7f54b7 | 564 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || |
c4d3efaf YK |
565 | rt->u.dst.dev->type != ARPHRD_TUNNEL) { |
566 | ip_rt_put(rt); | |
567 | goto out; | |
568 | } | |
adf30907 | 569 | skb_dst_set(skb2, (struct dst_entry *)rt); |
c4d3efaf YK |
570 | } else { |
571 | ip_rt_put(rt); | |
572 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
573 | skb2->dev) || | |
adf30907 | 574 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
575 | goto out; |
576 | } | |
577 | ||
578 | /* change mtu on this route */ | |
579 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 580 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
581 | goto out; |
582 | ||
adf30907 | 583 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
584 | } |
585 | ||
704eae1f | 586 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
587 | |
588 | out: | |
589 | kfree_skb(skb2); | |
590 | return 0; | |
591 | } | |
592 | ||
e490d1d8 YK |
593 | static int |
594 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 595 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
596 | { |
597 | int rel_msg = 0; | |
d5fdd6ba BH |
598 | u8 rel_type = type; |
599 | u8 rel_code = code; | |
704eae1f | 600 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
601 | int err; |
602 | ||
502b0935 YK |
603 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
604 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
605 | if (err < 0) |
606 | return err; | |
607 | ||
608 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
609 | struct rt6_info *rt; |
610 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 611 | |
1da177e4 | 612 | if (!skb2) |
e490d1d8 | 613 | return 0; |
1da177e4 | 614 | |
adf30907 | 615 | skb_dst_drop(skb2); |
1da177e4 | 616 | skb_pull(skb2, offset); |
c1d2bbe1 | 617 | skb_reset_network_header(skb2); |
1da177e4 LT |
618 | |
619 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
620 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
621 | NULL, 0, 0); | |
1da177e4 LT |
622 | |
623 | if (rt && rt->rt6i_dev) | |
624 | skb2->dev = rt->rt6i_dev; | |
625 | ||
626 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
627 | ||
628 | if (rt) | |
629 | dst_release(&rt->u.dst); | |
630 | ||
631 | kfree_skb(skb2); | |
632 | } | |
e490d1d8 YK |
633 | |
634 | return 0; | |
1da177e4 LT |
635 | } |
636 | ||
c4d3efaf YK |
637 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
638 | struct ipv6hdr *ipv6h, | |
639 | struct sk_buff *skb) | |
640 | { | |
641 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
642 | ||
643 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 644 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
645 | |
646 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 647 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
648 | } |
649 | ||
8359925b YK |
650 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
651 | struct ipv6hdr *ipv6h, | |
652 | struct sk_buff *skb) | |
1da177e4 | 653 | { |
8359925b | 654 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 655 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 656 | |
8359925b | 657 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 658 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 659 | } |
8359925b | 660 | |
f1a28eab | 661 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
662 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
663 | { | |
664 | struct ip6_tnl_parm *p = &t->parms; | |
665 | int ret = 0; | |
2f7f54b7 | 666 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
667 | |
668 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 669 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
670 | |
671 | if (p->link) | |
f1a28eab | 672 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
673 | |
674 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
675 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
676 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
677 | ret = 1; |
678 | ||
09c6bbf0 VN |
679 | } |
680 | return ret; | |
681 | } | |
1da177e4 LT |
682 | |
683 | /** | |
3144581c | 684 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 685 | * @skb: received socket buffer |
8359925b YK |
686 | * @protocol: ethernet protocol ID |
687 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
688 | * |
689 | * Return: 0 | |
690 | **/ | |
691 | ||
8359925b | 692 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 693 | __u8 ipproto, |
8359925b YK |
694 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
695 | struct ipv6hdr *ipv6h, | |
696 | struct sk_buff *skb)) | |
1da177e4 | 697 | { |
1da177e4 | 698 | struct ip6_tnl *t; |
0660e03f | 699 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 700 | |
2922bc8a | 701 | rcu_read_lock(); |
1da177e4 | 702 | |
8704ca7e | 703 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 704 | &ipv6h->daddr)) != NULL) { |
502b0935 | 705 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 706 | rcu_read_unlock(); |
502b0935 YK |
707 | goto discard; |
708 | } | |
709 | ||
1da177e4 | 710 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 711 | rcu_read_unlock(); |
50fba2aa | 712 | goto discard; |
1da177e4 LT |
713 | } |
714 | ||
09c6bbf0 | 715 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 716 | t->dev->stats.rx_dropped++; |
2922bc8a | 717 | rcu_read_unlock(); |
1da177e4 LT |
718 | goto discard; |
719 | } | |
720 | secpath_reset(skb); | |
b0e380b1 | 721 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 722 | skb_reset_network_header(skb); |
8359925b | 723 | skb->protocol = htons(protocol); |
1da177e4 LT |
724 | skb->pkt_type = PACKET_HOST; |
725 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
726 | skb->dev = t->dev; | |
adf30907 | 727 | skb_dst_drop(skb); |
53ab61c6 | 728 | nf_reset(skb); |
8359925b YK |
729 | |
730 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
731 | ||
3dca02af PE |
732 | t->dev->stats.rx_packets++; |
733 | t->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 734 | netif_rx(skb); |
2922bc8a | 735 | rcu_read_unlock(); |
1da177e4 LT |
736 | return 0; |
737 | } | |
2922bc8a | 738 | rcu_read_unlock(); |
1da177e4 | 739 | return 1; |
50fba2aa HX |
740 | |
741 | discard: | |
742 | kfree_skb(skb); | |
743 | return 0; | |
1da177e4 LT |
744 | } |
745 | ||
c4d3efaf YK |
746 | static int ip4ip6_rcv(struct sk_buff *skb) |
747 | { | |
502b0935 YK |
748 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
749 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
750 | } |
751 | ||
8359925b YK |
752 | static int ip6ip6_rcv(struct sk_buff *skb) |
753 | { | |
502b0935 YK |
754 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
755 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
756 | } |
757 | ||
6fb32dde VN |
758 | struct ipv6_tel_txoption { |
759 | struct ipv6_txoptions ops; | |
760 | __u8 dst_opt[8]; | |
761 | }; | |
1da177e4 | 762 | |
6fb32dde VN |
763 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
764 | { | |
765 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 766 | |
6fb32dde VN |
767 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
768 | opt->dst_opt[3] = 1; | |
769 | opt->dst_opt[4] = encap_limit; | |
770 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
771 | opt->dst_opt[6] = 1; | |
1da177e4 | 772 | |
6fb32dde VN |
773 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
774 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
775 | } |
776 | ||
777 | /** | |
3144581c | 778 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 779 | * @t: the outgoing tunnel device |
1ab1457c | 780 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
781 | * |
782 | * Description: | |
1ab1457c | 783 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
784 | * doesn't match source of incoming packet. |
785 | * | |
1ab1457c | 786 | * Return: |
1da177e4 LT |
787 | * 1 if conflict, |
788 | * 0 else | |
789 | **/ | |
790 | ||
791 | static inline int | |
3144581c | 792 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
793 | { |
794 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
795 | } | |
796 | ||
09c6bbf0 VN |
797 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
798 | { | |
799 | struct ip6_tnl_parm *p = &t->parms; | |
800 | int ret = 0; | |
2f7f54b7 | 801 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 802 | |
1ab1457c | 803 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
804 | struct net_device *ldev = NULL; |
805 | ||
f1a28eab | 806 | rcu_read_lock(); |
09c6bbf0 | 807 | if (p->link) |
f1a28eab | 808 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 809 | |
2f7f54b7 | 810 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
811 | printk(KERN_WARNING |
812 | "%s xmit: Local address not yet configured!\n", | |
813 | p->name); | |
814 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 815 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
816 | printk(KERN_WARNING |
817 | "%s xmit: Routing loop! " | |
818 | "Remote address found on this node!\n", | |
819 | p->name); | |
820 | else | |
821 | ret = 1; | |
f1a28eab | 822 | rcu_read_unlock(); |
09c6bbf0 VN |
823 | } |
824 | return ret; | |
825 | } | |
1da177e4 | 826 | /** |
61ec2aec | 827 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 828 | * @skb: the outgoing socket buffer |
1ab1457c | 829 | * @dev: the outgoing tunnel device |
61ec2aec YK |
830 | * @dsfield: dscp code for outer header |
831 | * @fl: flow of tunneled packet | |
832 | * @encap_limit: encapsulation limit | |
833 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
834 | * |
835 | * Description: | |
836 | * Build new header and do some sanity checks on the packet before sending | |
837 | * it. | |
838 | * | |
1ab1457c | 839 | * Return: |
c4d3efaf | 840 | * 0 on success |
61ec2aec YK |
841 | * -1 fail |
842 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
843 | **/ |
844 | ||
61ec2aec YK |
845 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
846 | struct net_device *dev, | |
847 | __u8 dsfield, | |
848 | struct flowi *fl, | |
849 | int encap_limit, | |
850 | __u32 *pmtu) | |
1da177e4 | 851 | { |
52479b62 | 852 | struct net *net = dev_net(dev); |
2941a486 | 853 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 854 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 855 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 856 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
857 | struct dst_entry *dst; |
858 | struct net_device *tdev; | |
859 | int mtu; | |
c2636b4d | 860 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 861 | u8 proto; |
61ec2aec | 862 | int err = -1; |
1da177e4 | 863 | int pkt_len; |
1da177e4 | 864 | |
1da177e4 LT |
865 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
866 | dst_hold(dst); | |
a57ebc90 | 867 | else { |
52479b62 | 868 | dst = ip6_route_output(net, NULL, fl); |
1da177e4 | 869 | |
52479b62 | 870 | if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
871 | goto tx_err_link_failure; |
872 | } | |
1da177e4 LT |
873 | |
874 | tdev = dst->dev; | |
875 | ||
876 | if (tdev == dev) { | |
877 | stats->collisions++; | |
878 | if (net_ratelimit()) | |
1ab1457c | 879 | printk(KERN_WARNING |
1da177e4 LT |
880 | "%s: Local routing loop detected!\n", |
881 | t->parms.name); | |
882 | goto tx_err_dst_release; | |
883 | } | |
884 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 885 | if (encap_limit >= 0) { |
1da177e4 LT |
886 | max_headroom += 8; |
887 | mtu -= 8; | |
888 | } | |
889 | if (mtu < IPV6_MIN_MTU) | |
890 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
891 | if (skb_dst(skb)) |
892 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 893 | if (skb->len > mtu) { |
61ec2aec YK |
894 | *pmtu = mtu; |
895 | err = -EMSGSIZE; | |
1da177e4 LT |
896 | goto tx_err_dst_release; |
897 | } | |
898 | ||
899 | /* | |
900 | * Okay, now see if we can stuff it in the buffer as-is. | |
901 | */ | |
902 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 903 | |
cfbba49d PM |
904 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
905 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 906 | struct sk_buff *new_skb; |
1ab1457c | 907 | |
1da177e4 LT |
908 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
909 | goto tx_err_dst_release; | |
910 | ||
911 | if (skb->sk) | |
912 | skb_set_owner_w(new_skb, skb->sk); | |
913 | kfree_skb(skb); | |
914 | skb = new_skb; | |
915 | } | |
adf30907 ED |
916 | skb_dst_drop(skb); |
917 | skb_dst_set(skb, dst_clone(dst)); | |
1da177e4 | 918 | |
b0e380b1 | 919 | skb->transport_header = skb->network_header; |
1da177e4 | 920 | |
61ec2aec | 921 | proto = fl->proto; |
6fb32dde VN |
922 | if (encap_limit >= 0) { |
923 | init_tel_txopt(&opt, encap_limit); | |
924 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
925 | } | |
e2d1bca7 ACM |
926 | skb_push(skb, sizeof(struct ipv6hdr)); |
927 | skb_reset_network_header(skb); | |
0660e03f | 928 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 929 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
930 | dsfield = INET_ECN_encapsulate(0, dsfield); |
931 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
932 | ipv6h->hop_limit = t->parms.hop_limit; |
933 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
934 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
935 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
936 | nf_reset(skb); |
937 | pkt_len = skb->len; | |
ef76bc23 | 938 | err = ip6_local_out(skb); |
1da177e4 | 939 | |
b9df3cb8 | 940 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
941 | stats->tx_bytes += pkt_len; |
942 | stats->tx_packets++; | |
943 | } else { | |
944 | stats->tx_errors++; | |
945 | stats->tx_aborted_errors++; | |
946 | } | |
947 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
948 | return 0; |
949 | tx_err_link_failure: | |
950 | stats->tx_carrier_errors++; | |
951 | dst_link_failure(skb); | |
952 | tx_err_dst_release: | |
953 | dst_release(dst); | |
61ec2aec YK |
954 | return err; |
955 | } | |
956 | ||
c4d3efaf YK |
957 | static inline int |
958 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
959 | { | |
960 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 961 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
962 | int encap_limit = -1; |
963 | struct flowi fl; | |
964 | __u8 dsfield; | |
965 | __u32 mtu; | |
966 | int err; | |
967 | ||
502b0935 YK |
968 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
969 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
970 | return -1; |
971 | ||
972 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
973 | encap_limit = t->parms.encap_limit; | |
974 | ||
975 | memcpy(&fl, &t->fl, sizeof (fl)); | |
976 | fl.proto = IPPROTO_IPIP; | |
977 | ||
978 | dsfield = ipv4_get_dsfield(iph); | |
979 | ||
980 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
981 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
982 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
983 | |
984 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
985 | if (err != 0) { | |
986 | /* XXX: send ICMP error even if DF is not set. */ | |
987 | if (err == -EMSGSIZE) | |
988 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
989 | htonl(mtu)); | |
990 | return -1; | |
991 | } | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
61ec2aec YK |
996 | static inline int |
997 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
998 | { | |
999 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1000 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1001 | int encap_limit = -1; |
1002 | __u16 offset; | |
1003 | struct flowi fl; | |
1004 | __u8 dsfield; | |
1005 | __u32 mtu; | |
1006 | int err; | |
1007 | ||
502b0935 YK |
1008 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1009 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1010 | return -1; |
1011 | ||
d56f90a7 ACM |
1012 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1013 | if (offset > 0) { | |
61ec2aec | 1014 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1015 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1016 | if (tel->encap_limit == 0) { |
1017 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
1018 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
1019 | return -1; | |
1020 | } | |
1021 | encap_limit = tel->encap_limit - 1; | |
1022 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1023 | encap_limit = t->parms.encap_limit; | |
1024 | ||
1025 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1026 | fl.proto = IPPROTO_IPV6; | |
1027 | ||
1028 | dsfield = ipv6_get_dsfield(ipv6h); | |
1029 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1030 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1031 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1032 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1033 | ||
1034 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1035 | if (err != 0) { | |
1036 | if (err == -EMSGSIZE) | |
1037 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
1038 | return -1; | |
1039 | } | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
6fef4c0c | 1044 | static netdev_tx_t |
61ec2aec YK |
1045 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1046 | { | |
1047 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1048 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1049 | int ret; |
1050 | ||
61ec2aec | 1051 | switch (skb->protocol) { |
60678040 | 1052 | case htons(ETH_P_IP): |
c4d3efaf YK |
1053 | ret = ip4ip6_tnl_xmit(skb, dev); |
1054 | break; | |
60678040 | 1055 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1056 | ret = ip6ip6_tnl_xmit(skb, dev); |
1057 | break; | |
1058 | default: | |
1059 | goto tx_err; | |
1060 | } | |
1061 | ||
1062 | if (ret < 0) | |
1063 | goto tx_err; | |
1064 | ||
6ed10654 | 1065 | return NETDEV_TX_OK; |
61ec2aec | 1066 | |
1da177e4 LT |
1067 | tx_err: |
1068 | stats->tx_errors++; | |
1069 | stats->tx_dropped++; | |
1070 | kfree_skb(skb); | |
6ed10654 | 1071 | return NETDEV_TX_OK; |
1da177e4 LT |
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 | ||
3a6d54c5 JP |
1099 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1100 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
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 | ||
2f7f54b7 PE |
1126 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1127 | &p->raddr, &p->laddr, | |
305d4b3c | 1128 | p->link, strict); |
1da177e4 LT |
1129 | |
1130 | if (rt == NULL) | |
1131 | return; | |
1132 | ||
1133 | if (rt->rt6i_dev) { | |
1134 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1135 | sizeof (struct ipv6hdr); | |
1136 | ||
1137 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1138 | ||
1139 | if (dev->mtu < IPV6_MIN_MTU) | |
1140 | dev->mtu = IPV6_MIN_MTU; | |
1141 | } | |
1142 | dst_release(&rt->u.dst); | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | /** | |
3144581c | 1147 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1148 | * @t: tunnel to be changed |
1149 | * @p: tunnel configuration parameters | |
1da177e4 LT |
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 | ||
1da177e4 | 1285 | /** |
3144581c | 1286 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1287 | * @dev: virtual device associated with tunnel |
1288 | * @new_mtu: the new mtu | |
1289 | * | |
1290 | * Return: | |
1291 | * 0 on success, | |
1292 | * %-EINVAL if mtu too small | |
1293 | **/ | |
1294 | ||
1295 | static int | |
3144581c | 1296 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1297 | { |
1298 | if (new_mtu < IPV6_MIN_MTU) { | |
1299 | return -EINVAL; | |
1300 | } | |
1301 | dev->mtu = new_mtu; | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1326c3d5 SH |
1305 | |
1306 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
1307 | .ndo_uninit = ip6_tnl_dev_uninit, | |
1308 | .ndo_start_xmit = ip6_tnl_xmit, | |
1309 | .ndo_do_ioctl = ip6_tnl_ioctl, | |
1310 | .ndo_change_mtu = ip6_tnl_change_mtu, | |
1311 | }; | |
1312 | ||
1da177e4 | 1313 | /** |
3144581c | 1314 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1315 | * @dev: virtual device associated with tunnel |
1316 | * | |
1317 | * Description: | |
1318 | * Initialize function pointers and device parameters | |
1319 | **/ | |
1320 | ||
3144581c | 1321 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1322 | { |
1326c3d5 | 1323 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
1da177e4 | 1324 | dev->destructor = free_netdev; |
1da177e4 LT |
1325 | |
1326 | dev->type = ARPHRD_TUNNEL6; | |
1327 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1328 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1329 | dev->flags |= IFF_NOARP; | |
1330 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1331 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | ||
1335 | /** | |
3144581c | 1336 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1337 | * @dev: virtual device associated with tunnel |
1338 | **/ | |
1339 | ||
1340 | static inline void | |
3144581c | 1341 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1342 | { |
2941a486 | 1343 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1344 | t->dev = dev; |
1345 | strcpy(t->parms.name, dev->name); | |
1346 | } | |
1347 | ||
1348 | /** | |
3144581c | 1349 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1350 | * @dev: virtual device associated with tunnel |
1351 | **/ | |
1352 | ||
1326c3d5 | 1353 | static void ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1354 | { |
2941a486 | 1355 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1356 | ip6_tnl_dev_init_gen(dev); |
1357 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1358 | } |
1359 | ||
1360 | /** | |
3144581c | 1361 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1362 | * @dev: fallback device |
1363 | * | |
1364 | * Return: 0 | |
1365 | **/ | |
1366 | ||
1326c3d5 | 1367 | static void ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1368 | { |
2941a486 | 1369 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1370 | struct net *net = dev_net(dev); |
1371 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1372 | ||
3144581c | 1373 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1374 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1375 | dev_hold(dev); |
3e6c9fb5 | 1376 | ip6n->tnls_wc[0] = t; |
1da177e4 LT |
1377 | } |
1378 | ||
c4d3efaf YK |
1379 | static struct xfrm6_tunnel ip4ip6_handler = { |
1380 | .handler = ip4ip6_rcv, | |
1381 | .err_handler = ip4ip6_err, | |
1382 | .priority = 1, | |
1383 | }; | |
1384 | ||
1da177e4 | 1385 | static struct xfrm6_tunnel ip6ip6_handler = { |
0303770d PM |
1386 | .handler = ip6ip6_rcv, |
1387 | .err_handler = ip6ip6_err, | |
d2acc347 | 1388 | .priority = 1, |
1da177e4 LT |
1389 | }; |
1390 | ||
3e6c9fb5 PE |
1391 | static void ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
1392 | { | |
1393 | int h; | |
1394 | struct ip6_tnl *t; | |
cf4432f5 | 1395 | LIST_HEAD(list); |
3e6c9fb5 PE |
1396 | |
1397 | for (h = 0; h < HASH_SIZE; h++) { | |
cf4432f5 ED |
1398 | t = ip6n->tnls_r_l[h]; |
1399 | while (t != NULL) { | |
1400 | unregister_netdevice_queue(t->dev, &list); | |
1401 | t = t->next; | |
1402 | } | |
3e6c9fb5 PE |
1403 | } |
1404 | ||
1405 | t = ip6n->tnls_wc[0]; | |
cf4432f5 ED |
1406 | unregister_netdevice_queue(t->dev, &list); |
1407 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1408 | } |
1409 | ||
13eeb8e9 PE |
1410 | static int ip6_tnl_init_net(struct net *net) |
1411 | { | |
ac31cd3c | 1412 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1413 | int err; |
13eeb8e9 | 1414 | |
3e6c9fb5 PE |
1415 | ip6n->tnls[0] = ip6n->tnls_wc; |
1416 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1417 | ||
15820e12 PE |
1418 | err = -ENOMEM; |
1419 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1420 | ip6_tnl_dev_setup); | |
1421 | ||
1422 | if (!ip6n->fb_tnl_dev) | |
1423 | goto err_alloc_dev; | |
be77e593 | 1424 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1425 | |
1326c3d5 | 1426 | ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
15820e12 PE |
1427 | |
1428 | err = register_netdev(ip6n->fb_tnl_dev); | |
1429 | if (err < 0) | |
1430 | goto err_register; | |
13eeb8e9 PE |
1431 | return 0; |
1432 | ||
15820e12 PE |
1433 | err_register: |
1434 | free_netdev(ip6n->fb_tnl_dev); | |
1435 | err_alloc_dev: | |
13eeb8e9 PE |
1436 | return err; |
1437 | } | |
1438 | ||
1439 | static void ip6_tnl_exit_net(struct net *net) | |
1440 | { | |
ac31cd3c | 1441 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1442 | |
3e6c9fb5 PE |
1443 | rtnl_lock(); |
1444 | ip6_tnl_destroy_tunnels(ip6n); | |
1445 | rtnl_unlock(); | |
13eeb8e9 PE |
1446 | } |
1447 | ||
1448 | static struct pernet_operations ip6_tnl_net_ops = { | |
1449 | .init = ip6_tnl_init_net, | |
1450 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1451 | .id = &ip6_tnl_net_id, |
1452 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1453 | }; |
1454 | ||
1da177e4 LT |
1455 | /** |
1456 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1457 | * | |
1458 | * Return: 0 on success | |
1459 | **/ | |
1460 | ||
1461 | static int __init ip6_tunnel_init(void) | |
1462 | { | |
1463 | int err; | |
1464 | ||
c4d3efaf | 1465 | if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { |
3144581c | 1466 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
c4d3efaf YK |
1467 | err = -EAGAIN; |
1468 | goto out; | |
1469 | } | |
1470 | ||
73d605d1 | 1471 | if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { |
3144581c | 1472 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
c4d3efaf YK |
1473 | err = -EAGAIN; |
1474 | goto unreg_ip4ip6; | |
1da177e4 | 1475 | } |
13eeb8e9 | 1476 | |
ac31cd3c | 1477 | err = register_pernet_device(&ip6_tnl_net_ops); |
13eeb8e9 PE |
1478 | if (err < 0) |
1479 | goto err_pernet; | |
1da177e4 | 1480 | return 0; |
13eeb8e9 | 1481 | err_pernet: |
73d605d1 | 1482 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
c4d3efaf YK |
1483 | unreg_ip4ip6: |
1484 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); | |
1485 | out: | |
1da177e4 LT |
1486 | return err; |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1491 | **/ | |
1492 | ||
1493 | static void __exit ip6_tunnel_cleanup(void) | |
1494 | { | |
c4d3efaf | 1495 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1496 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1497 | |
73d605d1 | 1498 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1499 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1500 | |
ac31cd3c | 1501 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1502 | } |
1503 | ||
1504 | module_init(ip6_tunnel_init); | |
1505 | module_exit(ip6_tunnel_cleanup); |