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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/atomic.h> | |
44 | ||
c4d3efaf | 45 | #include <net/icmp.h> |
1da177e4 LT |
46 | #include <net/ip.h> |
47 | #include <net/ipv6.h> | |
1da177e4 LT |
48 | #include <net/ip6_route.h> |
49 | #include <net/addrconf.h> | |
50 | #include <net/ip6_tunnel.h> | |
51 | #include <net/xfrm.h> | |
52 | #include <net/dsfield.h> | |
53 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
54 | #include <net/net_namespace.h> |
55 | #include <net/netns/generic.h> | |
1da177e4 LT |
56 | |
57 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 58 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 LT |
59 | MODULE_LICENSE("GPL"); |
60 | ||
61 | #define IPV6_TLV_TEL_DST_SIZE 8 | |
62 | ||
63 | #ifdef IP6_TNL_DEBUG | |
0dc47877 | 64 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
65 | #else |
66 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
67 | #endif | |
68 | ||
69 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 70 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
71 | |
72 | #define HASH_SIZE 32 | |
73 | ||
e69a4adc | 74 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
75 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
76 | (HASH_SIZE - 1)) | |
1da177e4 | 77 | |
1326c3d5 | 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 | 85 | /* lists for storing tunnels in use */ |
94767632 ED |
86 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
87 | struct ip6_tnl __rcu *tnls_wc[1]; | |
88 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
89 | }; |
90 | ||
2922bc8a | 91 | /* |
94767632 | 92 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 93 | */ |
1da177e4 LT |
94 | |
95 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
96 | { | |
97 | struct dst_entry *dst = t->dst_cache; | |
98 | ||
1ab1457c | 99 | if (dst && dst->obsolete && |
1da177e4 LT |
100 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
101 | t->dst_cache = NULL; | |
102 | dst_release(dst); | |
103 | return NULL; | |
104 | } | |
105 | ||
106 | return dst; | |
107 | } | |
108 | ||
109 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
110 | { | |
111 | dst_release(t->dst_cache); | |
112 | t->dst_cache = NULL; | |
113 | } | |
114 | ||
115 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
116 | { | |
117 | struct rt6_info *rt = (struct rt6_info *) dst; | |
118 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
119 | dst_release(t->dst_cache); | |
120 | t->dst_cache = dst; | |
121 | } | |
122 | ||
123 | /** | |
3144581c | 124 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
125 | * @remote: the address of the tunnel exit-point |
126 | * @local: the address of the tunnel entry-point | |
1da177e4 | 127 | * |
1ab1457c | 128 | * Return: |
1da177e4 | 129 | * tunnel matching given end-points if found, |
1ab1457c | 130 | * else fallback tunnel if its device is up, |
1da177e4 LT |
131 | * else %NULL |
132 | **/ | |
133 | ||
2922bc8a ED |
134 | #define for_each_ip6_tunnel_rcu(start) \ |
135 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
136 | ||
1da177e4 | 137 | static struct ip6_tnl * |
2dd02c89 | 138 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 | 139 | { |
94767632 ED |
140 | unsigned int h0 = HASH(remote); |
141 | unsigned int h1 = HASH(local); | |
1da177e4 | 142 | struct ip6_tnl *t; |
3e6c9fb5 | 143 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 144 | |
2922bc8a | 145 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
146 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
147 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
148 | (t->dev->flags & IFF_UP)) | |
149 | return t; | |
150 | } | |
2922bc8a ED |
151 | t = rcu_dereference(ip6n->tnls_wc[0]); |
152 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
153 | return t; |
154 | ||
155 | return NULL; | |
156 | } | |
157 | ||
158 | /** | |
3144581c | 159 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 160 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
161 | * |
162 | * Description: | |
3144581c | 163 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
164 | * &struct in6_addr entries laddr and raddr in @p. |
165 | * | |
1ab1457c | 166 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
167 | **/ |
168 | ||
94767632 | 169 | static struct ip6_tnl __rcu ** |
2dd02c89 | 170 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
171 | { |
172 | struct in6_addr *remote = &p->raddr; | |
173 | struct in6_addr *local = &p->laddr; | |
174 | unsigned h = 0; | |
175 | int prio = 0; | |
176 | ||
177 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
178 | prio = 1; | |
179 | h = HASH(remote) ^ HASH(local); | |
180 | } | |
3e6c9fb5 | 181 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
182 | } |
183 | ||
184 | /** | |
3144581c | 185 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
186 | * @t: tunnel to be added |
187 | **/ | |
188 | ||
189 | static void | |
2dd02c89 | 190 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 191 | { |
94767632 | 192 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 193 | |
94767632 | 194 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
2922bc8a | 195 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
196 | } |
197 | ||
198 | /** | |
3144581c | 199 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
200 | * @t: tunnel to be removed |
201 | **/ | |
202 | ||
203 | static void | |
2dd02c89 | 204 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 205 | { |
94767632 ED |
206 | struct ip6_tnl __rcu **tp; |
207 | struct ip6_tnl *iter; | |
208 | ||
209 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
210 | (iter = rtnl_dereference(*tp)) != NULL; | |
211 | tp = &iter->next) { | |
212 | if (t == iter) { | |
213 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
214 | break; |
215 | } | |
216 | } | |
217 | } | |
218 | ||
219 | /** | |
220 | * ip6_tnl_create() - create a new tunnel | |
221 | * @p: tunnel parameters | |
222 | * @pt: pointer to new tunnel | |
223 | * | |
224 | * Description: | |
225 | * Create tunnel matching given parameters. | |
1ab1457c YH |
226 | * |
227 | * Return: | |
567131a7 | 228 | * created tunnel or NULL |
1da177e4 LT |
229 | **/ |
230 | ||
2dd02c89 | 231 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
232 | { |
233 | struct net_device *dev; | |
234 | struct ip6_tnl *t; | |
235 | char name[IFNAMSIZ]; | |
236 | int err; | |
2dd02c89 | 237 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 238 | |
34cc7ba6 | 239 | if (p->name[0]) |
1da177e4 | 240 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
241 | else |
242 | sprintf(name, "ip6tnl%%d"); | |
243 | ||
3144581c | 244 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 245 | if (dev == NULL) |
567131a7 | 246 | goto failed; |
1da177e4 | 247 | |
554eb277 PE |
248 | dev_net_set(dev, net); |
249 | ||
b37d428b PE |
250 | if (strchr(name, '%')) { |
251 | if (dev_alloc_name(dev, name) < 0) | |
252 | goto failed_free; | |
253 | } | |
254 | ||
2941a486 | 255 | t = netdev_priv(dev); |
1da177e4 | 256 | t->parms = *p; |
20461c17 | 257 | ip6_tnl_dev_init(dev); |
1da177e4 | 258 | |
b37d428b PE |
259 | if ((err = register_netdevice(dev)) < 0) |
260 | goto failed_free; | |
261 | ||
1da177e4 | 262 | dev_hold(dev); |
2dd02c89 | 263 | ip6_tnl_link(ip6n, t); |
567131a7 | 264 | return t; |
b37d428b PE |
265 | |
266 | failed_free: | |
267 | free_netdev(dev); | |
567131a7 VN |
268 | failed: |
269 | return NULL; | |
1da177e4 LT |
270 | } |
271 | ||
272 | /** | |
3144581c | 273 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 274 | * @p: tunnel parameters |
1da177e4 LT |
275 | * @create: != 0 if allowed to create new tunnel if no match found |
276 | * | |
277 | * Description: | |
3144581c | 278 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
279 | * based on @parms. If this is unsuccessful, but @create is set a new |
280 | * tunnel device is created and registered for use. | |
281 | * | |
282 | * Return: | |
567131a7 | 283 | * matching tunnel or NULL |
1da177e4 LT |
284 | **/ |
285 | ||
2dd02c89 PE |
286 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
287 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
288 | { |
289 | struct in6_addr *remote = &p->raddr; | |
290 | struct in6_addr *local = &p->laddr; | |
94767632 | 291 | struct ip6_tnl __rcu **tp; |
1da177e4 | 292 | struct ip6_tnl *t; |
2dd02c89 | 293 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 294 | |
94767632 ED |
295 | for (tp = ip6_tnl_bucket(ip6n, p); |
296 | (t = rtnl_dereference(*tp)) != NULL; | |
297 | tp = &t->next) { | |
1da177e4 | 298 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
299 | ipv6_addr_equal(remote, &t->parms.raddr)) |
300 | return t; | |
1da177e4 LT |
301 | } |
302 | if (!create) | |
567131a7 | 303 | return NULL; |
2dd02c89 | 304 | return ip6_tnl_create(net, p); |
1da177e4 LT |
305 | } |
306 | ||
307 | /** | |
3144581c | 308 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 309 | * @dev: the device to be destroyed |
1ab1457c | 310 | * |
1da177e4 | 311 | * Description: |
3144581c | 312 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
313 | **/ |
314 | ||
315 | static void | |
3144581c | 316 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 317 | { |
2941a486 | 318 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
319 | struct net *net = dev_net(dev); |
320 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 321 | |
94767632 ED |
322 | if (dev == ip6n->fb_tnl_dev) |
323 | rcu_assign_pointer(ip6n->tnls_wc[0], NULL); | |
324 | else | |
2dd02c89 | 325 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
326 | ip6_tnl_dst_reset(t); |
327 | dev_put(dev); | |
328 | } | |
329 | ||
330 | /** | |
331 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
332 | * @skb: received socket buffer | |
333 | * | |
1ab1457c YH |
334 | * Return: |
335 | * 0 if none was found, | |
1da177e4 LT |
336 | * else index to encapsulation limit |
337 | **/ | |
338 | ||
339 | static __u16 | |
340 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
341 | { | |
342 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
343 | __u8 nexthdr = ipv6h->nexthdr; | |
344 | __u16 off = sizeof (*ipv6h); | |
345 | ||
346 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
347 | __u16 optlen = 0; | |
348 | struct ipv6_opt_hdr *hdr; | |
349 | if (raw + off + sizeof (*hdr) > skb->data && | |
350 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
351 | break; | |
352 | ||
353 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
354 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
355 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
356 | if (frag_hdr->frag_off) | |
357 | break; | |
358 | optlen = 8; | |
359 | } else if (nexthdr == NEXTHDR_AUTH) { | |
360 | optlen = (hdr->hdrlen + 2) << 2; | |
361 | } else { | |
362 | optlen = ipv6_optlen(hdr); | |
363 | } | |
364 | if (nexthdr == NEXTHDR_DEST) { | |
365 | __u16 i = off + 2; | |
366 | while (1) { | |
367 | struct ipv6_tlv_tnl_enc_lim *tel; | |
368 | ||
369 | /* No more room for encapsulation limit */ | |
370 | if (i + sizeof (*tel) > off + optlen) | |
371 | break; | |
372 | ||
373 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
374 | /* return index of option if found and valid */ | |
375 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
376 | tel->length == 1) | |
377 | return i; | |
378 | /* else jump to next option */ | |
379 | if (tel->type) | |
380 | i += tel->length + 2; | |
381 | else | |
382 | i++; | |
383 | } | |
384 | } | |
385 | nexthdr = hdr->nexthdr; | |
386 | off += optlen; | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
391 | /** | |
e490d1d8 | 392 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
393 | * |
394 | * Description: | |
e490d1d8 | 395 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
396 | * to the specifications in RFC 2473. |
397 | **/ | |
398 | ||
d2acc347 | 399 | static int |
502b0935 | 400 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 401 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
402 | { |
403 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
404 | struct ip6_tnl *t; | |
405 | int rel_msg = 0; | |
d5fdd6ba BH |
406 | u8 rel_type = ICMPV6_DEST_UNREACH; |
407 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
408 | __u32 rel_info = 0; |
409 | __u16 len; | |
d2acc347 | 410 | int err = -ENOENT; |
1da177e4 | 411 | |
1ab1457c YH |
412 | /* If the packet doesn't contain the original IPv6 header we are |
413 | in trouble since we might need the source address for further | |
1da177e4 LT |
414 | processing of the error. */ |
415 | ||
2922bc8a | 416 | rcu_read_lock(); |
8704ca7e | 417 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 418 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
419 | goto out; |
420 | ||
502b0935 YK |
421 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
422 | goto out; | |
423 | ||
d2acc347 HX |
424 | err = 0; |
425 | ||
e490d1d8 | 426 | switch (*type) { |
1da177e4 LT |
427 | __u32 teli; |
428 | struct ipv6_tlv_tnl_enc_lim *tel; | |
429 | __u32 mtu; | |
430 | case ICMPV6_DEST_UNREACH: | |
431 | if (net_ratelimit()) | |
432 | printk(KERN_WARNING | |
433 | "%s: Path to destination invalid " | |
434 | "or inactive!\n", t->parms.name); | |
435 | rel_msg = 1; | |
436 | break; | |
437 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 438 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
439 | if (net_ratelimit()) |
440 | printk(KERN_WARNING | |
441 | "%s: Too small hop limit or " | |
1ab1457c | 442 | "routing loop in tunnel!\n", |
1da177e4 LT |
443 | t->parms.name); |
444 | rel_msg = 1; | |
445 | } | |
446 | break; | |
447 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 448 | teli = 0; |
e490d1d8 | 449 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 450 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 451 | |
704eae1f | 452 | if (teli && teli == *info - 2) { |
1da177e4 LT |
453 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
454 | if (tel->encap_limit == 0) { | |
455 | if (net_ratelimit()) | |
456 | printk(KERN_WARNING | |
457 | "%s: Too small encapsulation " | |
458 | "limit or routing loop in " | |
459 | "tunnel!\n", t->parms.name); | |
460 | rel_msg = 1; | |
461 | } | |
107a5fe6 VN |
462 | } else if (net_ratelimit()) { |
463 | printk(KERN_WARNING | |
464 | "%s: Recipient unable to parse tunneled " | |
465 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
466 | } |
467 | break; | |
468 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 469 | mtu = *info - offset; |
1da177e4 LT |
470 | if (mtu < IPV6_MIN_MTU) |
471 | mtu = IPV6_MIN_MTU; | |
472 | t->dev->mtu = mtu; | |
473 | ||
cc6cdac0 | 474 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
475 | rel_type = ICMPV6_PKT_TOOBIG; |
476 | rel_code = 0; | |
477 | rel_info = mtu; | |
478 | rel_msg = 1; | |
479 | } | |
480 | break; | |
481 | } | |
e490d1d8 YK |
482 | |
483 | *type = rel_type; | |
484 | *code = rel_code; | |
485 | *info = rel_info; | |
486 | *msg = rel_msg; | |
487 | ||
488 | out: | |
2922bc8a | 489 | rcu_read_unlock(); |
e490d1d8 YK |
490 | return err; |
491 | } | |
492 | ||
c4d3efaf YK |
493 | static int |
494 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 495 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
496 | { |
497 | int rel_msg = 0; | |
d5fdd6ba BH |
498 | u8 rel_type = type; |
499 | u8 rel_code = code; | |
704eae1f | 500 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
501 | int err; |
502 | struct sk_buff *skb2; | |
503 | struct iphdr *eiph; | |
504 | struct flowi fl; | |
505 | struct rtable *rt; | |
506 | ||
502b0935 YK |
507 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
508 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
509 | if (err < 0) |
510 | return err; | |
511 | ||
512 | if (rel_msg == 0) | |
513 | return 0; | |
514 | ||
515 | switch (rel_type) { | |
516 | case ICMPV6_DEST_UNREACH: | |
517 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
518 | return 0; | |
519 | rel_type = ICMP_DEST_UNREACH; | |
520 | rel_code = ICMP_HOST_UNREACH; | |
521 | break; | |
522 | case ICMPV6_PKT_TOOBIG: | |
523 | if (rel_code != 0) | |
524 | return 0; | |
525 | rel_type = ICMP_DEST_UNREACH; | |
526 | rel_code = ICMP_FRAG_NEEDED; | |
527 | break; | |
528 | default: | |
529 | return 0; | |
530 | } | |
531 | ||
532 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
533 | return 0; | |
534 | ||
535 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
536 | if (!skb2) | |
537 | return 0; | |
538 | ||
adf30907 ED |
539 | skb_dst_drop(skb2); |
540 | ||
c4d3efaf | 541 | skb_pull(skb2, offset); |
c1d2bbe1 | 542 | skb_reset_network_header(skb2); |
eddc9ec5 | 543 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
544 | |
545 | /* Try to guess incoming interface */ | |
546 | memset(&fl, 0, sizeof(fl)); | |
547 | fl.fl4_dst = eiph->saddr; | |
548 | fl.fl4_tos = RT_TOS(eiph->tos); | |
549 | fl.proto = IPPROTO_IPIP; | |
2f7f54b7 | 550 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) |
c4d3efaf YK |
551 | goto out; |
552 | ||
d8d1f30b | 553 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
554 | |
555 | /* route "incoming" packet */ | |
556 | if (rt->rt_flags & RTCF_LOCAL) { | |
557 | ip_rt_put(rt); | |
558 | rt = NULL; | |
559 | fl.fl4_dst = eiph->daddr; | |
560 | fl.fl4_src = eiph->saddr; | |
561 | fl.fl4_tos = eiph->tos; | |
2f7f54b7 | 562 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || |
d8d1f30b | 563 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
c4d3efaf YK |
564 | ip_rt_put(rt); |
565 | goto out; | |
566 | } | |
adf30907 | 567 | skb_dst_set(skb2, (struct dst_entry *)rt); |
c4d3efaf YK |
568 | } else { |
569 | ip_rt_put(rt); | |
570 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
571 | skb2->dev) || | |
adf30907 | 572 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
573 | goto out; |
574 | } | |
575 | ||
576 | /* change mtu on this route */ | |
577 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 578 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
579 | goto out; |
580 | ||
adf30907 | 581 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
582 | } |
583 | ||
704eae1f | 584 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
585 | |
586 | out: | |
587 | kfree_skb(skb2); | |
588 | return 0; | |
589 | } | |
590 | ||
e490d1d8 YK |
591 | static int |
592 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 593 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
594 | { |
595 | int rel_msg = 0; | |
d5fdd6ba BH |
596 | u8 rel_type = type; |
597 | u8 rel_code = code; | |
704eae1f | 598 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
599 | int err; |
600 | ||
502b0935 YK |
601 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
602 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
603 | if (err < 0) |
604 | return err; | |
605 | ||
606 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
607 | struct rt6_info *rt; |
608 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 609 | |
1da177e4 | 610 | if (!skb2) |
e490d1d8 | 611 | return 0; |
1da177e4 | 612 | |
adf30907 | 613 | skb_dst_drop(skb2); |
1da177e4 | 614 | skb_pull(skb2, offset); |
c1d2bbe1 | 615 | skb_reset_network_header(skb2); |
1da177e4 LT |
616 | |
617 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
618 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
619 | NULL, 0, 0); | |
1da177e4 LT |
620 | |
621 | if (rt && rt->rt6i_dev) | |
622 | skb2->dev = rt->rt6i_dev; | |
623 | ||
3ffe533c | 624 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
625 | |
626 | if (rt) | |
d8d1f30b | 627 | dst_release(&rt->dst); |
1da177e4 LT |
628 | |
629 | kfree_skb(skb2); | |
630 | } | |
e490d1d8 YK |
631 | |
632 | return 0; | |
1da177e4 LT |
633 | } |
634 | ||
c4d3efaf YK |
635 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
636 | struct ipv6hdr *ipv6h, | |
637 | struct sk_buff *skb) | |
638 | { | |
639 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
640 | ||
641 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 642 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
643 | |
644 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 645 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
646 | } |
647 | ||
8359925b YK |
648 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
649 | struct ipv6hdr *ipv6h, | |
650 | struct sk_buff *skb) | |
1da177e4 | 651 | { |
8359925b | 652 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 653 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 654 | |
8359925b | 655 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 656 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 657 | } |
8359925b | 658 | |
f1a28eab | 659 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
660 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
661 | { | |
662 | struct ip6_tnl_parm *p = &t->parms; | |
663 | int ret = 0; | |
2f7f54b7 | 664 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
665 | |
666 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 667 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
668 | |
669 | if (p->link) | |
f1a28eab | 670 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
671 | |
672 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
673 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
674 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
675 | ret = 1; |
676 | ||
09c6bbf0 VN |
677 | } |
678 | return ret; | |
679 | } | |
1da177e4 LT |
680 | |
681 | /** | |
3144581c | 682 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 683 | * @skb: received socket buffer |
8359925b YK |
684 | * @protocol: ethernet protocol ID |
685 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
686 | * |
687 | * Return: 0 | |
688 | **/ | |
689 | ||
8359925b | 690 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 691 | __u8 ipproto, |
8359925b YK |
692 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
693 | struct ipv6hdr *ipv6h, | |
694 | struct sk_buff *skb)) | |
1da177e4 | 695 | { |
1da177e4 | 696 | struct ip6_tnl *t; |
0660e03f | 697 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 698 | |
2922bc8a | 699 | rcu_read_lock(); |
1da177e4 | 700 | |
8704ca7e | 701 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 702 | &ipv6h->daddr)) != NULL) { |
502b0935 | 703 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 704 | rcu_read_unlock(); |
502b0935 YK |
705 | goto discard; |
706 | } | |
707 | ||
1da177e4 | 708 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 709 | rcu_read_unlock(); |
50fba2aa | 710 | goto discard; |
1da177e4 LT |
711 | } |
712 | ||
09c6bbf0 | 713 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 714 | t->dev->stats.rx_dropped++; |
2922bc8a | 715 | rcu_read_unlock(); |
1da177e4 LT |
716 | goto discard; |
717 | } | |
718 | secpath_reset(skb); | |
b0e380b1 | 719 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 720 | skb_reset_network_header(skb); |
8359925b | 721 | skb->protocol = htons(protocol); |
1da177e4 LT |
722 | skb->pkt_type = PACKET_HOST; |
723 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 724 | |
d19d56dd | 725 | skb_tunnel_rx(skb, t->dev); |
8359925b | 726 | |
d19d56dd | 727 | dscp_ecn_decapsulate(t, ipv6h, skb); |
1da177e4 | 728 | netif_rx(skb); |
2922bc8a | 729 | rcu_read_unlock(); |
1da177e4 LT |
730 | return 0; |
731 | } | |
2922bc8a | 732 | rcu_read_unlock(); |
1da177e4 | 733 | return 1; |
50fba2aa HX |
734 | |
735 | discard: | |
736 | kfree_skb(skb); | |
737 | return 0; | |
1da177e4 LT |
738 | } |
739 | ||
c4d3efaf YK |
740 | static int ip4ip6_rcv(struct sk_buff *skb) |
741 | { | |
502b0935 YK |
742 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
743 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
744 | } |
745 | ||
8359925b YK |
746 | static int ip6ip6_rcv(struct sk_buff *skb) |
747 | { | |
502b0935 YK |
748 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
749 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
750 | } |
751 | ||
6fb32dde VN |
752 | struct ipv6_tel_txoption { |
753 | struct ipv6_txoptions ops; | |
754 | __u8 dst_opt[8]; | |
755 | }; | |
1da177e4 | 756 | |
6fb32dde VN |
757 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
758 | { | |
759 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 760 | |
6fb32dde VN |
761 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
762 | opt->dst_opt[3] = 1; | |
763 | opt->dst_opt[4] = encap_limit; | |
764 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
765 | opt->dst_opt[6] = 1; | |
1da177e4 | 766 | |
6fb32dde VN |
767 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
768 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
769 | } |
770 | ||
771 | /** | |
3144581c | 772 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 773 | * @t: the outgoing tunnel device |
1ab1457c | 774 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
775 | * |
776 | * Description: | |
1ab1457c | 777 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
778 | * doesn't match source of incoming packet. |
779 | * | |
1ab1457c | 780 | * Return: |
1da177e4 LT |
781 | * 1 if conflict, |
782 | * 0 else | |
783 | **/ | |
784 | ||
785 | static inline int | |
3144581c | 786 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
787 | { |
788 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
789 | } | |
790 | ||
09c6bbf0 VN |
791 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
792 | { | |
793 | struct ip6_tnl_parm *p = &t->parms; | |
794 | int ret = 0; | |
2f7f54b7 | 795 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 796 | |
1ab1457c | 797 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
798 | struct net_device *ldev = NULL; |
799 | ||
f1a28eab | 800 | rcu_read_lock(); |
09c6bbf0 | 801 | if (p->link) |
f1a28eab | 802 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 803 | |
2f7f54b7 | 804 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
805 | printk(KERN_WARNING |
806 | "%s xmit: Local address not yet configured!\n", | |
807 | p->name); | |
808 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 809 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
810 | printk(KERN_WARNING |
811 | "%s xmit: Routing loop! " | |
812 | "Remote address found on this node!\n", | |
813 | p->name); | |
814 | else | |
815 | ret = 1; | |
f1a28eab | 816 | rcu_read_unlock(); |
09c6bbf0 VN |
817 | } |
818 | return ret; | |
819 | } | |
1da177e4 | 820 | /** |
61ec2aec | 821 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 822 | * @skb: the outgoing socket buffer |
1ab1457c | 823 | * @dev: the outgoing tunnel device |
61ec2aec YK |
824 | * @dsfield: dscp code for outer header |
825 | * @fl: flow of tunneled packet | |
826 | * @encap_limit: encapsulation limit | |
827 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
828 | * |
829 | * Description: | |
830 | * Build new header and do some sanity checks on the packet before sending | |
831 | * it. | |
832 | * | |
1ab1457c | 833 | * Return: |
c4d3efaf | 834 | * 0 on success |
61ec2aec YK |
835 | * -1 fail |
836 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
837 | **/ |
838 | ||
61ec2aec YK |
839 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
840 | struct net_device *dev, | |
841 | __u8 dsfield, | |
842 | struct flowi *fl, | |
843 | int encap_limit, | |
844 | __u32 *pmtu) | |
1da177e4 | 845 | { |
52479b62 | 846 | struct net *net = dev_net(dev); |
2941a486 | 847 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 848 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 849 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 850 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
851 | struct dst_entry *dst; |
852 | struct net_device *tdev; | |
853 | int mtu; | |
c2636b4d | 854 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 855 | u8 proto; |
61ec2aec | 856 | int err = -1; |
1da177e4 | 857 | int pkt_len; |
1da177e4 | 858 | |
1da177e4 LT |
859 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
860 | dst_hold(dst); | |
a57ebc90 | 861 | else { |
52479b62 | 862 | dst = ip6_route_output(net, NULL, fl); |
1da177e4 | 863 | |
52479b62 | 864 | if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
865 | goto tx_err_link_failure; |
866 | } | |
1da177e4 LT |
867 | |
868 | tdev = dst->dev; | |
869 | ||
870 | if (tdev == dev) { | |
871 | stats->collisions++; | |
872 | if (net_ratelimit()) | |
1ab1457c | 873 | printk(KERN_WARNING |
1da177e4 LT |
874 | "%s: Local routing loop detected!\n", |
875 | t->parms.name); | |
876 | goto tx_err_dst_release; | |
877 | } | |
878 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 879 | if (encap_limit >= 0) { |
1da177e4 LT |
880 | max_headroom += 8; |
881 | mtu -= 8; | |
882 | } | |
883 | if (mtu < IPV6_MIN_MTU) | |
884 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
885 | if (skb_dst(skb)) |
886 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 887 | if (skb->len > mtu) { |
61ec2aec YK |
888 | *pmtu = mtu; |
889 | err = -EMSGSIZE; | |
1da177e4 LT |
890 | goto tx_err_dst_release; |
891 | } | |
892 | ||
893 | /* | |
894 | * Okay, now see if we can stuff it in the buffer as-is. | |
895 | */ | |
896 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 897 | |
cfbba49d PM |
898 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
899 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 900 | struct sk_buff *new_skb; |
1ab1457c | 901 | |
1da177e4 LT |
902 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
903 | goto tx_err_dst_release; | |
904 | ||
905 | if (skb->sk) | |
906 | skb_set_owner_w(new_skb, skb->sk); | |
907 | kfree_skb(skb); | |
908 | skb = new_skb; | |
909 | } | |
adf30907 ED |
910 | skb_dst_drop(skb); |
911 | skb_dst_set(skb, dst_clone(dst)); | |
1da177e4 | 912 | |
b0e380b1 | 913 | skb->transport_header = skb->network_header; |
1da177e4 | 914 | |
61ec2aec | 915 | proto = fl->proto; |
6fb32dde VN |
916 | if (encap_limit >= 0) { |
917 | init_tel_txopt(&opt, encap_limit); | |
918 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
919 | } | |
e2d1bca7 ACM |
920 | skb_push(skb, sizeof(struct ipv6hdr)); |
921 | skb_reset_network_header(skb); | |
0660e03f | 922 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 923 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
924 | dsfield = INET_ECN_encapsulate(0, dsfield); |
925 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
926 | ipv6h->hop_limit = t->parms.hop_limit; |
927 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
928 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
929 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
930 | nf_reset(skb); |
931 | pkt_len = skb->len; | |
ef76bc23 | 932 | err = ip6_local_out(skb); |
1da177e4 | 933 | |
b9df3cb8 | 934 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
935 | stats->tx_bytes += pkt_len; |
936 | stats->tx_packets++; | |
937 | } else { | |
938 | stats->tx_errors++; | |
939 | stats->tx_aborted_errors++; | |
940 | } | |
941 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
942 | return 0; |
943 | tx_err_link_failure: | |
944 | stats->tx_carrier_errors++; | |
945 | dst_link_failure(skb); | |
946 | tx_err_dst_release: | |
947 | dst_release(dst); | |
61ec2aec YK |
948 | return err; |
949 | } | |
950 | ||
c4d3efaf YK |
951 | static inline int |
952 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
953 | { | |
954 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 955 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
956 | int encap_limit = -1; |
957 | struct flowi fl; | |
958 | __u8 dsfield; | |
959 | __u32 mtu; | |
960 | int err; | |
961 | ||
502b0935 YK |
962 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
963 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
964 | return -1; |
965 | ||
966 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
967 | encap_limit = t->parms.encap_limit; | |
968 | ||
969 | memcpy(&fl, &t->fl, sizeof (fl)); | |
970 | fl.proto = IPPROTO_IPIP; | |
971 | ||
972 | dsfield = ipv4_get_dsfield(iph); | |
973 | ||
974 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
975 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
976 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
977 | |
978 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
979 | if (err != 0) { | |
980 | /* XXX: send ICMP error even if DF is not set. */ | |
981 | if (err == -EMSGSIZE) | |
982 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
983 | htonl(mtu)); | |
984 | return -1; | |
985 | } | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
61ec2aec YK |
990 | static inline int |
991 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
992 | { | |
993 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 994 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
995 | int encap_limit = -1; |
996 | __u16 offset; | |
997 | struct flowi fl; | |
998 | __u8 dsfield; | |
999 | __u32 mtu; | |
1000 | int err; | |
1001 | ||
502b0935 YK |
1002 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1003 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1004 | return -1; |
1005 | ||
d56f90a7 ACM |
1006 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1007 | if (offset > 0) { | |
61ec2aec | 1008 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1009 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1010 | if (tel->encap_limit == 0) { |
1011 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1012 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1013 | return -1; |
1014 | } | |
1015 | encap_limit = tel->encap_limit - 1; | |
1016 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1017 | encap_limit = t->parms.encap_limit; | |
1018 | ||
1019 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1020 | fl.proto = IPPROTO_IPV6; | |
1021 | ||
1022 | dsfield = ipv6_get_dsfield(ipv6h); | |
1023 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1024 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1025 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1026 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1027 | ||
1028 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1029 | if (err != 0) { | |
1030 | if (err == -EMSGSIZE) | |
3ffe533c | 1031 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1032 | return -1; |
1033 | } | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
6fef4c0c | 1038 | static netdev_tx_t |
61ec2aec YK |
1039 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1040 | { | |
1041 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1042 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1043 | int ret; |
1044 | ||
61ec2aec | 1045 | switch (skb->protocol) { |
60678040 | 1046 | case htons(ETH_P_IP): |
c4d3efaf YK |
1047 | ret = ip4ip6_tnl_xmit(skb, dev); |
1048 | break; | |
60678040 | 1049 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1050 | ret = ip6ip6_tnl_xmit(skb, dev); |
1051 | break; | |
1052 | default: | |
1053 | goto tx_err; | |
1054 | } | |
1055 | ||
1056 | if (ret < 0) | |
1057 | goto tx_err; | |
1058 | ||
6ed10654 | 1059 | return NETDEV_TX_OK; |
61ec2aec | 1060 | |
1da177e4 LT |
1061 | tx_err: |
1062 | stats->tx_errors++; | |
1063 | stats->tx_dropped++; | |
1064 | kfree_skb(skb); | |
6ed10654 | 1065 | return NETDEV_TX_OK; |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1069 | { | |
1070 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1071 | int ltype = ipv6_addr_type(&p->laddr); |
1072 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1073 | |
1074 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1075 | ||
09c6bbf0 VN |
1076 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1077 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1078 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1079 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1080 | if (ltype&IPV6_ADDR_UNICAST) |
1081 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1082 | if (rtype&IPV6_ADDR_UNICAST) | |
1083 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1084 | } |
1085 | } | |
1086 | ||
3144581c | 1087 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1088 | { |
1089 | struct net_device *dev = t->dev; | |
1090 | struct ip6_tnl_parm *p = &t->parms; | |
1091 | struct flowi *fl = &t->fl; | |
1092 | ||
3a6d54c5 JP |
1093 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1094 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1095 | |
1096 | /* Set up flowi template */ | |
1097 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1098 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1099 | fl->oif = p->link; | |
1100 | fl->fl6_flowlabel = 0; | |
1101 | ||
1102 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1103 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1104 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1105 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1106 | ||
1107 | ip6_tnl_set_cap(t); | |
1108 | ||
1109 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1110 | dev->flags |= IFF_POINTOPOINT; | |
1111 | else | |
1112 | dev->flags &= ~IFF_POINTOPOINT; | |
1113 | ||
1114 | dev->iflink = p->link; | |
1115 | ||
1116 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1117 | int strict = (ipv6_addr_type(&p->raddr) & |
1118 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1119 | ||
2f7f54b7 PE |
1120 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1121 | &p->raddr, &p->laddr, | |
305d4b3c | 1122 | p->link, strict); |
1da177e4 LT |
1123 | |
1124 | if (rt == NULL) | |
1125 | return; | |
1126 | ||
1127 | if (rt->rt6i_dev) { | |
1128 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1129 | sizeof (struct ipv6hdr); | |
1130 | ||
1131 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1132 | ||
1133 | if (dev->mtu < IPV6_MIN_MTU) | |
1134 | dev->mtu = IPV6_MIN_MTU; | |
1135 | } | |
d8d1f30b | 1136 | dst_release(&rt->dst); |
1da177e4 LT |
1137 | } |
1138 | } | |
1139 | ||
1140 | /** | |
3144581c | 1141 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1142 | * @t: tunnel to be changed |
1143 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1144 | * |
1145 | * Description: | |
3144581c | 1146 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1147 | **/ |
1148 | ||
1149 | static int | |
3144581c | 1150 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1151 | { |
1152 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1153 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1154 | t->parms.flags = p->flags; | |
1155 | t->parms.hop_limit = p->hop_limit; | |
1156 | t->parms.encap_limit = p->encap_limit; | |
1157 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1158 | t->parms.link = p->link; |
502b0935 | 1159 | t->parms.proto = p->proto; |
0c088890 | 1160 | ip6_tnl_dst_reset(t); |
3144581c | 1161 | ip6_tnl_link_config(t); |
1da177e4 LT |
1162 | return 0; |
1163 | } | |
1164 | ||
1165 | /** | |
3144581c | 1166 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1167 | * @dev: virtual device associated with tunnel |
1168 | * @ifr: parameters passed from userspace | |
1169 | * @cmd: command to be performed | |
1170 | * | |
1171 | * Description: | |
3144581c | 1172 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1173 | * from userspace. |
1da177e4 LT |
1174 | * |
1175 | * The possible commands are the following: | |
1176 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1177 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1178 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1179 | * %SIOCDELTUNNEL: delete tunnel | |
1180 | * | |
1ab1457c | 1181 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1182 | * initialization, can be used for creating other tunnel devices. |
1183 | * | |
1184 | * Return: | |
1185 | * 0 on success, | |
1186 | * %-EFAULT if unable to copy data to or from userspace, | |
1187 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1188 | * %-EINVAL if passed tunnel parameters are invalid, | |
1189 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1190 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1191 | **/ | |
1192 | ||
1193 | static int | |
3144581c | 1194 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1195 | { |
1196 | int err = 0; | |
1da177e4 LT |
1197 | struct ip6_tnl_parm p; |
1198 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1199 | struct net *net = dev_net(dev); |
1200 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1201 | |
1202 | switch (cmd) { | |
1203 | case SIOCGETTUNNEL: | |
15820e12 | 1204 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1205 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1206 | err = -EFAULT; |
1207 | break; | |
1208 | } | |
2dd02c89 | 1209 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1210 | } |
1211 | if (t == NULL) | |
2941a486 | 1212 | t = netdev_priv(dev); |
1da177e4 LT |
1213 | memcpy(&p, &t->parms, sizeof (p)); |
1214 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1215 | err = -EFAULT; | |
1216 | } | |
1217 | break; | |
1218 | case SIOCADDTUNNEL: | |
1219 | case SIOCCHGTUNNEL: | |
1220 | err = -EPERM; | |
1da177e4 LT |
1221 | if (!capable(CAP_NET_ADMIN)) |
1222 | break; | |
567131a7 VN |
1223 | err = -EFAULT; |
1224 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1225 | break; |
567131a7 | 1226 | err = -EINVAL; |
502b0935 YK |
1227 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1228 | p.proto != 0) | |
1da177e4 | 1229 | break; |
2dd02c89 | 1230 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1231 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1232 | if (t != NULL) { |
1233 | if (t->dev != dev) { | |
1234 | err = -EEXIST; | |
1235 | break; | |
1236 | } | |
1237 | } else | |
1238 | t = netdev_priv(dev); | |
1239 | ||
2dd02c89 | 1240 | ip6_tnl_unlink(ip6n, t); |
3144581c | 1241 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1242 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1243 | netdev_state_change(dev); |
1244 | } | |
567131a7 | 1245 | if (t) { |
1da177e4 | 1246 | err = 0; |
567131a7 VN |
1247 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1248 | err = -EFAULT; | |
1249 | ||
1250 | } else | |
1251 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1252 | break; |
1253 | case SIOCDELTUNNEL: | |
1254 | err = -EPERM; | |
1255 | if (!capable(CAP_NET_ADMIN)) | |
1256 | break; | |
1257 | ||
15820e12 | 1258 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1259 | err = -EFAULT; |
1260 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1261 | break; |
567131a7 | 1262 | err = -ENOENT; |
2dd02c89 | 1263 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1264 | break; |
567131a7 | 1265 | err = -EPERM; |
15820e12 | 1266 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1267 | break; |
567131a7 | 1268 | dev = t->dev; |
1da177e4 | 1269 | } |
22f8cde5 SH |
1270 | err = 0; |
1271 | unregister_netdevice(dev); | |
1da177e4 LT |
1272 | break; |
1273 | default: | |
1274 | err = -EINVAL; | |
1275 | } | |
1276 | return err; | |
1277 | } | |
1278 | ||
1da177e4 | 1279 | /** |
3144581c | 1280 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1281 | * @dev: virtual device associated with tunnel |
1282 | * @new_mtu: the new mtu | |
1283 | * | |
1284 | * Return: | |
1285 | * 0 on success, | |
1286 | * %-EINVAL if mtu too small | |
1287 | **/ | |
1288 | ||
1289 | static int | |
3144581c | 1290 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1291 | { |
1292 | if (new_mtu < IPV6_MIN_MTU) { | |
1293 | return -EINVAL; | |
1294 | } | |
1295 | dev->mtu = new_mtu; | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1326c3d5 SH |
1299 | |
1300 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
1301 | .ndo_uninit = ip6_tnl_dev_uninit, | |
1302 | .ndo_start_xmit = ip6_tnl_xmit, | |
1303 | .ndo_do_ioctl = ip6_tnl_ioctl, | |
1304 | .ndo_change_mtu = ip6_tnl_change_mtu, | |
1305 | }; | |
1306 | ||
1da177e4 | 1307 | /** |
3144581c | 1308 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1309 | * @dev: virtual device associated with tunnel |
1310 | * | |
1311 | * Description: | |
1312 | * Initialize function pointers and device parameters | |
1313 | **/ | |
1314 | ||
3144581c | 1315 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1316 | { |
1326c3d5 | 1317 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
1da177e4 | 1318 | dev->destructor = free_netdev; |
1da177e4 LT |
1319 | |
1320 | dev->type = ARPHRD_TUNNEL6; | |
1321 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1322 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1323 | dev->flags |= IFF_NOARP; | |
1324 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1325 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1326 | } |
1327 | ||
1328 | ||
1329 | /** | |
3144581c | 1330 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1331 | * @dev: virtual device associated with tunnel |
1332 | **/ | |
1333 | ||
1334 | static inline void | |
3144581c | 1335 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1336 | { |
2941a486 | 1337 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1338 | t->dev = dev; |
1339 | strcpy(t->parms.name, dev->name); | |
1340 | } | |
1341 | ||
1342 | /** | |
3144581c | 1343 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1344 | * @dev: virtual device associated with tunnel |
1345 | **/ | |
1346 | ||
1326c3d5 | 1347 | static void ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1348 | { |
2941a486 | 1349 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1350 | ip6_tnl_dev_init_gen(dev); |
1351 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | /** | |
3144581c | 1355 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1356 | * @dev: fallback device |
1357 | * | |
1358 | * Return: 0 | |
1359 | **/ | |
1360 | ||
2c8c1e72 | 1361 | static void __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1362 | { |
2941a486 | 1363 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1364 | struct net *net = dev_net(dev); |
1365 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1366 | ||
3144581c | 1367 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1368 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1369 | dev_hold(dev); |
94767632 | 1370 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
1da177e4 LT |
1371 | } |
1372 | ||
3ff2cfa5 | 1373 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1374 | .handler = ip4ip6_rcv, |
1375 | .err_handler = ip4ip6_err, | |
1376 | .priority = 1, | |
1377 | }; | |
1378 | ||
3ff2cfa5 | 1379 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1380 | .handler = ip6ip6_rcv, |
1381 | .err_handler = ip6ip6_err, | |
d2acc347 | 1382 | .priority = 1, |
1da177e4 LT |
1383 | }; |
1384 | ||
2c8c1e72 | 1385 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1386 | { |
1387 | int h; | |
1388 | struct ip6_tnl *t; | |
cf4432f5 | 1389 | LIST_HEAD(list); |
3e6c9fb5 PE |
1390 | |
1391 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1392 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1393 | while (t != NULL) { |
1394 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1395 | t = rtnl_dereference(t->next); |
cf4432f5 | 1396 | } |
3e6c9fb5 PE |
1397 | } |
1398 | ||
94767632 | 1399 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1400 | unregister_netdevice_queue(t->dev, &list); |
1401 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1402 | } |
1403 | ||
2c8c1e72 | 1404 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1405 | { |
ac31cd3c | 1406 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1407 | int err; |
13eeb8e9 | 1408 | |
3e6c9fb5 PE |
1409 | ip6n->tnls[0] = ip6n->tnls_wc; |
1410 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1411 | ||
15820e12 PE |
1412 | err = -ENOMEM; |
1413 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1414 | ip6_tnl_dev_setup); | |
1415 | ||
1416 | if (!ip6n->fb_tnl_dev) | |
1417 | goto err_alloc_dev; | |
be77e593 | 1418 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1419 | |
1326c3d5 | 1420 | ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
15820e12 PE |
1421 | |
1422 | err = register_netdev(ip6n->fb_tnl_dev); | |
1423 | if (err < 0) | |
1424 | goto err_register; | |
13eeb8e9 PE |
1425 | return 0; |
1426 | ||
15820e12 PE |
1427 | err_register: |
1428 | free_netdev(ip6n->fb_tnl_dev); | |
1429 | err_alloc_dev: | |
13eeb8e9 PE |
1430 | return err; |
1431 | } | |
1432 | ||
2c8c1e72 | 1433 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1434 | { |
ac31cd3c | 1435 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1436 | |
3e6c9fb5 PE |
1437 | rtnl_lock(); |
1438 | ip6_tnl_destroy_tunnels(ip6n); | |
1439 | rtnl_unlock(); | |
13eeb8e9 PE |
1440 | } |
1441 | ||
1442 | static struct pernet_operations ip6_tnl_net_ops = { | |
1443 | .init = ip6_tnl_init_net, | |
1444 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1445 | .id = &ip6_tnl_net_id, |
1446 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1447 | }; |
1448 | ||
1da177e4 LT |
1449 | /** |
1450 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1451 | * | |
1452 | * Return: 0 on success | |
1453 | **/ | |
1454 | ||
1455 | static int __init ip6_tunnel_init(void) | |
1456 | { | |
1457 | int err; | |
1458 | ||
d5aa407f AD |
1459 | err = register_pernet_device(&ip6_tnl_net_ops); |
1460 | if (err < 0) | |
1461 | goto out_pernet; | |
1462 | ||
1463 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1464 | if (err < 0) { | |
3144581c | 1465 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1466 | goto out_ip4ip6; |
c4d3efaf YK |
1467 | } |
1468 | ||
d5aa407f AD |
1469 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1470 | if (err < 0) { | |
3144581c | 1471 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1472 | goto out_ip6ip6; |
1da177e4 | 1473 | } |
13eeb8e9 | 1474 | |
1da177e4 | 1475 | return 0; |
d5aa407f AD |
1476 | |
1477 | out_ip6ip6: | |
c4d3efaf | 1478 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1479 | out_ip4ip6: |
1480 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1481 | out_pernet: | |
1da177e4 LT |
1482 | return err; |
1483 | } | |
1484 | ||
1485 | /** | |
1486 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1487 | **/ | |
1488 | ||
1489 | static void __exit ip6_tunnel_cleanup(void) | |
1490 | { | |
c4d3efaf | 1491 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1492 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1493 | |
73d605d1 | 1494 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1495 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1496 | |
ac31cd3c | 1497 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1498 | } |
1499 | ||
1500 | module_init(ip6_tunnel_init); | |
1501 | module_exit(ip6_tunnel_cleanup); |