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 | 77 | static void ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 78 | static void ip6_tnl_dev_setup(struct net_device *dev); |
1da177e4 | 79 | |
f99189b1 | 80 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 81 | struct ip6_tnl_net { |
15820e12 PE |
82 | /* the IPv6 tunnel fallback device */ |
83 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 PE |
84 | /* lists for storing tunnels in use */ |
85 | struct ip6_tnl *tnls_r_l[HASH_SIZE]; | |
86 | struct ip6_tnl *tnls_wc[1]; | |
87 | struct ip6_tnl **tnls[2]; | |
13eeb8e9 PE |
88 | }; |
89 | ||
2922bc8a ED |
90 | /* |
91 | * Locking : hash tables are protected by RCU and a spinlock | |
92 | */ | |
93 | static DEFINE_SPINLOCK(ip6_tnl_lock); | |
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 LT |
139 | { |
140 | unsigned h0 = HASH(remote); | |
141 | unsigned h1 = HASH(local); | |
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 | ||
169 | static struct ip6_tnl ** | |
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 | { |
2dd02c89 | 192 | struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 193 | |
2922bc8a | 194 | spin_lock_bh(&ip6_tnl_lock); |
1da177e4 | 195 | t->next = *tp; |
2922bc8a ED |
196 | rcu_assign_pointer(*tp, t); |
197 | spin_unlock_bh(&ip6_tnl_lock); | |
1da177e4 LT |
198 | } |
199 | ||
200 | /** | |
3144581c | 201 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
202 | * @t: tunnel to be removed |
203 | **/ | |
204 | ||
205 | static void | |
2dd02c89 | 206 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 LT |
207 | { |
208 | struct ip6_tnl **tp; | |
209 | ||
2dd02c89 | 210 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { |
1da177e4 | 211 | if (t == *tp) { |
2922bc8a | 212 | spin_lock_bh(&ip6_tnl_lock); |
1da177e4 | 213 | *tp = t->next; |
2922bc8a | 214 | spin_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
215 | break; |
216 | } | |
217 | } | |
218 | } | |
219 | ||
220 | /** | |
221 | * ip6_tnl_create() - create a new tunnel | |
222 | * @p: tunnel parameters | |
223 | * @pt: pointer to new tunnel | |
224 | * | |
225 | * Description: | |
226 | * Create tunnel matching given parameters. | |
1ab1457c YH |
227 | * |
228 | * Return: | |
567131a7 | 229 | * created tunnel or NULL |
1da177e4 LT |
230 | **/ |
231 | ||
2dd02c89 | 232 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
233 | { |
234 | struct net_device *dev; | |
235 | struct ip6_tnl *t; | |
236 | char name[IFNAMSIZ]; | |
237 | int err; | |
2dd02c89 | 238 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 239 | |
34cc7ba6 | 240 | if (p->name[0]) |
1da177e4 | 241 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
242 | else |
243 | sprintf(name, "ip6tnl%%d"); | |
244 | ||
3144581c | 245 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 246 | if (dev == NULL) |
567131a7 | 247 | goto failed; |
1da177e4 | 248 | |
554eb277 PE |
249 | dev_net_set(dev, net); |
250 | ||
b37d428b PE |
251 | if (strchr(name, '%')) { |
252 | if (dev_alloc_name(dev, name) < 0) | |
253 | goto failed_free; | |
254 | } | |
255 | ||
2941a486 | 256 | t = netdev_priv(dev); |
1da177e4 | 257 | t->parms = *p; |
20461c17 | 258 | ip6_tnl_dev_init(dev); |
1da177e4 | 259 | |
b37d428b PE |
260 | if ((err = register_netdevice(dev)) < 0) |
261 | goto failed_free; | |
262 | ||
1da177e4 | 263 | dev_hold(dev); |
2dd02c89 | 264 | ip6_tnl_link(ip6n, t); |
567131a7 | 265 | return t; |
b37d428b PE |
266 | |
267 | failed_free: | |
268 | free_netdev(dev); | |
567131a7 VN |
269 | failed: |
270 | return NULL; | |
1da177e4 LT |
271 | } |
272 | ||
273 | /** | |
3144581c | 274 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 275 | * @p: tunnel parameters |
1da177e4 LT |
276 | * @create: != 0 if allowed to create new tunnel if no match found |
277 | * | |
278 | * Description: | |
3144581c | 279 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
280 | * based on @parms. If this is unsuccessful, but @create is set a new |
281 | * tunnel device is created and registered for use. | |
282 | * | |
283 | * Return: | |
567131a7 | 284 | * matching tunnel or NULL |
1da177e4 LT |
285 | **/ |
286 | ||
2dd02c89 PE |
287 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
288 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
289 | { |
290 | struct in6_addr *remote = &p->raddr; | |
291 | struct in6_addr *local = &p->laddr; | |
292 | struct ip6_tnl *t; | |
2dd02c89 | 293 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 294 | |
2dd02c89 | 295 | for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) { |
1da177e4 | 296 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
297 | ipv6_addr_equal(remote, &t->parms.raddr)) |
298 | return t; | |
1da177e4 LT |
299 | } |
300 | if (!create) | |
567131a7 | 301 | return NULL; |
2dd02c89 | 302 | return ip6_tnl_create(net, p); |
1da177e4 LT |
303 | } |
304 | ||
305 | /** | |
3144581c | 306 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 307 | * @dev: the device to be destroyed |
1ab1457c | 308 | * |
1da177e4 | 309 | * Description: |
3144581c | 310 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
311 | **/ |
312 | ||
313 | static void | |
3144581c | 314 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 315 | { |
2941a486 | 316 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
317 | struct net *net = dev_net(dev); |
318 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 319 | |
15820e12 | 320 | if (dev == ip6n->fb_tnl_dev) { |
2922bc8a | 321 | spin_lock_bh(&ip6_tnl_lock); |
3e6c9fb5 | 322 | ip6n->tnls_wc[0] = NULL; |
2922bc8a | 323 | spin_unlock_bh(&ip6_tnl_lock); |
1da177e4 | 324 | } else { |
2dd02c89 | 325 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
326 | } |
327 | ip6_tnl_dst_reset(t); | |
328 | dev_put(dev); | |
329 | } | |
330 | ||
331 | /** | |
332 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
333 | * @skb: received socket buffer | |
334 | * | |
1ab1457c YH |
335 | * Return: |
336 | * 0 if none was found, | |
1da177e4 LT |
337 | * else index to encapsulation limit |
338 | **/ | |
339 | ||
340 | static __u16 | |
341 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
342 | { | |
343 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
344 | __u8 nexthdr = ipv6h->nexthdr; | |
345 | __u16 off = sizeof (*ipv6h); | |
346 | ||
347 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
348 | __u16 optlen = 0; | |
349 | struct ipv6_opt_hdr *hdr; | |
350 | if (raw + off + sizeof (*hdr) > skb->data && | |
351 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
352 | break; | |
353 | ||
354 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
355 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
356 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
357 | if (frag_hdr->frag_off) | |
358 | break; | |
359 | optlen = 8; | |
360 | } else if (nexthdr == NEXTHDR_AUTH) { | |
361 | optlen = (hdr->hdrlen + 2) << 2; | |
362 | } else { | |
363 | optlen = ipv6_optlen(hdr); | |
364 | } | |
365 | if (nexthdr == NEXTHDR_DEST) { | |
366 | __u16 i = off + 2; | |
367 | while (1) { | |
368 | struct ipv6_tlv_tnl_enc_lim *tel; | |
369 | ||
370 | /* No more room for encapsulation limit */ | |
371 | if (i + sizeof (*tel) > off + optlen) | |
372 | break; | |
373 | ||
374 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
375 | /* return index of option if found and valid */ | |
376 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
377 | tel->length == 1) | |
378 | return i; | |
379 | /* else jump to next option */ | |
380 | if (tel->type) | |
381 | i += tel->length + 2; | |
382 | else | |
383 | i++; | |
384 | } | |
385 | } | |
386 | nexthdr = hdr->nexthdr; | |
387 | off += optlen; | |
388 | } | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /** | |
e490d1d8 | 393 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
394 | * |
395 | * Description: | |
e490d1d8 | 396 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
397 | * to the specifications in RFC 2473. |
398 | **/ | |
399 | ||
d2acc347 | 400 | static int |
502b0935 | 401 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 402 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
403 | { |
404 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
405 | struct ip6_tnl *t; | |
406 | int rel_msg = 0; | |
d5fdd6ba BH |
407 | u8 rel_type = ICMPV6_DEST_UNREACH; |
408 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
409 | __u32 rel_info = 0; |
410 | __u16 len; | |
d2acc347 | 411 | int err = -ENOENT; |
1da177e4 | 412 | |
1ab1457c YH |
413 | /* If the packet doesn't contain the original IPv6 header we are |
414 | in trouble since we might need the source address for further | |
1da177e4 LT |
415 | processing of the error. */ |
416 | ||
2922bc8a | 417 | rcu_read_lock(); |
8704ca7e | 418 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 419 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
420 | goto out; |
421 | ||
502b0935 YK |
422 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
423 | goto out; | |
424 | ||
d2acc347 HX |
425 | err = 0; |
426 | ||
e490d1d8 | 427 | switch (*type) { |
1da177e4 LT |
428 | __u32 teli; |
429 | struct ipv6_tlv_tnl_enc_lim *tel; | |
430 | __u32 mtu; | |
431 | case ICMPV6_DEST_UNREACH: | |
432 | if (net_ratelimit()) | |
433 | printk(KERN_WARNING | |
434 | "%s: Path to destination invalid " | |
435 | "or inactive!\n", t->parms.name); | |
436 | rel_msg = 1; | |
437 | break; | |
438 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 439 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
440 | if (net_ratelimit()) |
441 | printk(KERN_WARNING | |
442 | "%s: Too small hop limit or " | |
1ab1457c | 443 | "routing loop in tunnel!\n", |
1da177e4 LT |
444 | t->parms.name); |
445 | rel_msg = 1; | |
446 | } | |
447 | break; | |
448 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 449 | teli = 0; |
e490d1d8 | 450 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 451 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 452 | |
704eae1f | 453 | if (teli && teli == *info - 2) { |
1da177e4 LT |
454 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
455 | if (tel->encap_limit == 0) { | |
456 | if (net_ratelimit()) | |
457 | printk(KERN_WARNING | |
458 | "%s: Too small encapsulation " | |
459 | "limit or routing loop in " | |
460 | "tunnel!\n", t->parms.name); | |
461 | rel_msg = 1; | |
462 | } | |
107a5fe6 VN |
463 | } else if (net_ratelimit()) { |
464 | printk(KERN_WARNING | |
465 | "%s: Recipient unable to parse tunneled " | |
466 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
467 | } |
468 | break; | |
469 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 470 | mtu = *info - offset; |
1da177e4 LT |
471 | if (mtu < IPV6_MIN_MTU) |
472 | mtu = IPV6_MIN_MTU; | |
473 | t->dev->mtu = mtu; | |
474 | ||
cc6cdac0 | 475 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
476 | rel_type = ICMPV6_PKT_TOOBIG; |
477 | rel_code = 0; | |
478 | rel_info = mtu; | |
479 | rel_msg = 1; | |
480 | } | |
481 | break; | |
482 | } | |
e490d1d8 YK |
483 | |
484 | *type = rel_type; | |
485 | *code = rel_code; | |
486 | *info = rel_info; | |
487 | *msg = rel_msg; | |
488 | ||
489 | out: | |
2922bc8a | 490 | rcu_read_unlock(); |
e490d1d8 YK |
491 | return err; |
492 | } | |
493 | ||
c4d3efaf YK |
494 | static int |
495 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 496 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
497 | { |
498 | int rel_msg = 0; | |
d5fdd6ba BH |
499 | u8 rel_type = type; |
500 | u8 rel_code = code; | |
704eae1f | 501 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
502 | int err; |
503 | struct sk_buff *skb2; | |
504 | struct iphdr *eiph; | |
505 | struct flowi fl; | |
506 | struct rtable *rt; | |
507 | ||
502b0935 YK |
508 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
509 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
510 | if (err < 0) |
511 | return err; | |
512 | ||
513 | if (rel_msg == 0) | |
514 | return 0; | |
515 | ||
516 | switch (rel_type) { | |
517 | case ICMPV6_DEST_UNREACH: | |
518 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
519 | return 0; | |
520 | rel_type = ICMP_DEST_UNREACH; | |
521 | rel_code = ICMP_HOST_UNREACH; | |
522 | break; | |
523 | case ICMPV6_PKT_TOOBIG: | |
524 | if (rel_code != 0) | |
525 | return 0; | |
526 | rel_type = ICMP_DEST_UNREACH; | |
527 | rel_code = ICMP_FRAG_NEEDED; | |
528 | break; | |
529 | default: | |
530 | return 0; | |
531 | } | |
532 | ||
533 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
534 | return 0; | |
535 | ||
536 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
537 | if (!skb2) | |
538 | return 0; | |
539 | ||
adf30907 ED |
540 | skb_dst_drop(skb2); |
541 | ||
c4d3efaf | 542 | skb_pull(skb2, offset); |
c1d2bbe1 | 543 | skb_reset_network_header(skb2); |
eddc9ec5 | 544 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
545 | |
546 | /* Try to guess incoming interface */ | |
547 | memset(&fl, 0, sizeof(fl)); | |
548 | fl.fl4_dst = eiph->saddr; | |
549 | fl.fl4_tos = RT_TOS(eiph->tos); | |
550 | fl.proto = IPPROTO_IPIP; | |
2f7f54b7 | 551 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) |
c4d3efaf YK |
552 | goto out; |
553 | ||
554 | skb2->dev = rt->u.dst.dev; | |
555 | ||
556 | /* route "incoming" packet */ | |
557 | if (rt->rt_flags & RTCF_LOCAL) { | |
558 | ip_rt_put(rt); | |
559 | rt = NULL; | |
560 | fl.fl4_dst = eiph->daddr; | |
561 | fl.fl4_src = eiph->saddr; | |
562 | fl.fl4_tos = eiph->tos; | |
2f7f54b7 | 563 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || |
c4d3efaf YK |
564 | rt->u.dst.dev->type != ARPHRD_TUNNEL) { |
565 | ip_rt_put(rt); | |
566 | goto out; | |
567 | } | |
adf30907 | 568 | skb_dst_set(skb2, (struct dst_entry *)rt); |
c4d3efaf YK |
569 | } else { |
570 | ip_rt_put(rt); | |
571 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
572 | skb2->dev) || | |
adf30907 | 573 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
574 | goto out; |
575 | } | |
576 | ||
577 | /* change mtu on this route */ | |
578 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 579 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
580 | goto out; |
581 | ||
adf30907 | 582 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
583 | } |
584 | ||
704eae1f | 585 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
586 | |
587 | out: | |
588 | kfree_skb(skb2); | |
589 | return 0; | |
590 | } | |
591 | ||
e490d1d8 YK |
592 | static int |
593 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 594 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
595 | { |
596 | int rel_msg = 0; | |
d5fdd6ba BH |
597 | u8 rel_type = type; |
598 | u8 rel_code = code; | |
704eae1f | 599 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
600 | int err; |
601 | ||
502b0935 YK |
602 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
603 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
604 | if (err < 0) |
605 | return err; | |
606 | ||
607 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
608 | struct rt6_info *rt; |
609 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 610 | |
1da177e4 | 611 | if (!skb2) |
e490d1d8 | 612 | return 0; |
1da177e4 | 613 | |
adf30907 | 614 | skb_dst_drop(skb2); |
1da177e4 | 615 | skb_pull(skb2, offset); |
c1d2bbe1 | 616 | skb_reset_network_header(skb2); |
1da177e4 LT |
617 | |
618 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
619 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
620 | NULL, 0, 0); | |
1da177e4 LT |
621 | |
622 | if (rt && rt->rt6i_dev) | |
623 | skb2->dev = rt->rt6i_dev; | |
624 | ||
3ffe533c | 625 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
626 | |
627 | if (rt) | |
628 | dst_release(&rt->u.dst); | |
629 | ||
630 | kfree_skb(skb2); | |
631 | } | |
e490d1d8 YK |
632 | |
633 | return 0; | |
1da177e4 LT |
634 | } |
635 | ||
c4d3efaf YK |
636 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
637 | struct ipv6hdr *ipv6h, | |
638 | struct sk_buff *skb) | |
639 | { | |
640 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
641 | ||
642 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 643 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
644 | |
645 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 646 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
647 | } |
648 | ||
8359925b YK |
649 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
650 | struct ipv6hdr *ipv6h, | |
651 | struct sk_buff *skb) | |
1da177e4 | 652 | { |
8359925b | 653 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 654 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 655 | |
8359925b | 656 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 657 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 658 | } |
8359925b | 659 | |
f1a28eab | 660 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
661 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
662 | { | |
663 | struct ip6_tnl_parm *p = &t->parms; | |
664 | int ret = 0; | |
2f7f54b7 | 665 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
666 | |
667 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 668 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
669 | |
670 | if (p->link) | |
f1a28eab | 671 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
672 | |
673 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
674 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
675 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
676 | ret = 1; |
677 | ||
09c6bbf0 VN |
678 | } |
679 | return ret; | |
680 | } | |
1da177e4 LT |
681 | |
682 | /** | |
3144581c | 683 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 684 | * @skb: received socket buffer |
8359925b YK |
685 | * @protocol: ethernet protocol ID |
686 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
687 | * |
688 | * Return: 0 | |
689 | **/ | |
690 | ||
8359925b | 691 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 692 | __u8 ipproto, |
8359925b YK |
693 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
694 | struct ipv6hdr *ipv6h, | |
695 | struct sk_buff *skb)) | |
1da177e4 | 696 | { |
1da177e4 | 697 | struct ip6_tnl *t; |
0660e03f | 698 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 699 | |
2922bc8a | 700 | rcu_read_lock(); |
1da177e4 | 701 | |
8704ca7e | 702 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 703 | &ipv6h->daddr)) != NULL) { |
502b0935 | 704 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 705 | rcu_read_unlock(); |
502b0935 YK |
706 | goto discard; |
707 | } | |
708 | ||
1da177e4 | 709 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 710 | rcu_read_unlock(); |
50fba2aa | 711 | goto discard; |
1da177e4 LT |
712 | } |
713 | ||
09c6bbf0 | 714 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 715 | t->dev->stats.rx_dropped++; |
2922bc8a | 716 | rcu_read_unlock(); |
1da177e4 LT |
717 | goto discard; |
718 | } | |
719 | secpath_reset(skb); | |
b0e380b1 | 720 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 721 | skb_reset_network_header(skb); |
8359925b | 722 | skb->protocol = htons(protocol); |
1da177e4 LT |
723 | skb->pkt_type = PACKET_HOST; |
724 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
725 | skb->dev = t->dev; | |
adf30907 | 726 | skb_dst_drop(skb); |
53ab61c6 | 727 | nf_reset(skb); |
8359925b YK |
728 | |
729 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
730 | ||
3dca02af PE |
731 | t->dev->stats.rx_packets++; |
732 | t->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 733 | netif_rx(skb); |
2922bc8a | 734 | rcu_read_unlock(); |
1da177e4 LT |
735 | return 0; |
736 | } | |
2922bc8a | 737 | rcu_read_unlock(); |
1da177e4 | 738 | return 1; |
50fba2aa HX |
739 | |
740 | discard: | |
741 | kfree_skb(skb); | |
742 | return 0; | |
1da177e4 LT |
743 | } |
744 | ||
c4d3efaf YK |
745 | static int ip4ip6_rcv(struct sk_buff *skb) |
746 | { | |
502b0935 YK |
747 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
748 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
749 | } |
750 | ||
8359925b YK |
751 | static int ip6ip6_rcv(struct sk_buff *skb) |
752 | { | |
502b0935 YK |
753 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
754 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
755 | } |
756 | ||
6fb32dde VN |
757 | struct ipv6_tel_txoption { |
758 | struct ipv6_txoptions ops; | |
759 | __u8 dst_opt[8]; | |
760 | }; | |
1da177e4 | 761 | |
6fb32dde VN |
762 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
763 | { | |
764 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 765 | |
6fb32dde VN |
766 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
767 | opt->dst_opt[3] = 1; | |
768 | opt->dst_opt[4] = encap_limit; | |
769 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
770 | opt->dst_opt[6] = 1; | |
1da177e4 | 771 | |
6fb32dde VN |
772 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
773 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
774 | } |
775 | ||
776 | /** | |
3144581c | 777 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 778 | * @t: the outgoing tunnel device |
1ab1457c | 779 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
780 | * |
781 | * Description: | |
1ab1457c | 782 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
783 | * doesn't match source of incoming packet. |
784 | * | |
1ab1457c | 785 | * Return: |
1da177e4 LT |
786 | * 1 if conflict, |
787 | * 0 else | |
788 | **/ | |
789 | ||
790 | static inline int | |
3144581c | 791 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
792 | { |
793 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
794 | } | |
795 | ||
09c6bbf0 VN |
796 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
797 | { | |
798 | struct ip6_tnl_parm *p = &t->parms; | |
799 | int ret = 0; | |
2f7f54b7 | 800 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 801 | |
1ab1457c | 802 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
803 | struct net_device *ldev = NULL; |
804 | ||
f1a28eab | 805 | rcu_read_lock(); |
09c6bbf0 | 806 | if (p->link) |
f1a28eab | 807 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 808 | |
2f7f54b7 | 809 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
810 | printk(KERN_WARNING |
811 | "%s xmit: Local address not yet configured!\n", | |
812 | p->name); | |
813 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 814 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
815 | printk(KERN_WARNING |
816 | "%s xmit: Routing loop! " | |
817 | "Remote address found on this node!\n", | |
818 | p->name); | |
819 | else | |
820 | ret = 1; | |
f1a28eab | 821 | rcu_read_unlock(); |
09c6bbf0 VN |
822 | } |
823 | return ret; | |
824 | } | |
1da177e4 | 825 | /** |
61ec2aec | 826 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 827 | * @skb: the outgoing socket buffer |
1ab1457c | 828 | * @dev: the outgoing tunnel device |
61ec2aec YK |
829 | * @dsfield: dscp code for outer header |
830 | * @fl: flow of tunneled packet | |
831 | * @encap_limit: encapsulation limit | |
832 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
833 | * |
834 | * Description: | |
835 | * Build new header and do some sanity checks on the packet before sending | |
836 | * it. | |
837 | * | |
1ab1457c | 838 | * Return: |
c4d3efaf | 839 | * 0 on success |
61ec2aec YK |
840 | * -1 fail |
841 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
842 | **/ |
843 | ||
61ec2aec YK |
844 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
845 | struct net_device *dev, | |
846 | __u8 dsfield, | |
847 | struct flowi *fl, | |
848 | int encap_limit, | |
849 | __u32 *pmtu) | |
1da177e4 | 850 | { |
52479b62 | 851 | struct net *net = dev_net(dev); |
2941a486 | 852 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 853 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 854 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 855 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
856 | struct dst_entry *dst; |
857 | struct net_device *tdev; | |
858 | int mtu; | |
c2636b4d | 859 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 860 | u8 proto; |
61ec2aec | 861 | int err = -1; |
1da177e4 | 862 | int pkt_len; |
1da177e4 | 863 | |
1da177e4 LT |
864 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
865 | dst_hold(dst); | |
a57ebc90 | 866 | else { |
52479b62 | 867 | dst = ip6_route_output(net, NULL, fl); |
1da177e4 | 868 | |
52479b62 | 869 | if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
870 | goto tx_err_link_failure; |
871 | } | |
1da177e4 LT |
872 | |
873 | tdev = dst->dev; | |
874 | ||
875 | if (tdev == dev) { | |
876 | stats->collisions++; | |
877 | if (net_ratelimit()) | |
1ab1457c | 878 | printk(KERN_WARNING |
1da177e4 LT |
879 | "%s: Local routing loop detected!\n", |
880 | t->parms.name); | |
881 | goto tx_err_dst_release; | |
882 | } | |
883 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 884 | if (encap_limit >= 0) { |
1da177e4 LT |
885 | max_headroom += 8; |
886 | mtu -= 8; | |
887 | } | |
888 | if (mtu < IPV6_MIN_MTU) | |
889 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
890 | if (skb_dst(skb)) |
891 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 892 | if (skb->len > mtu) { |
61ec2aec YK |
893 | *pmtu = mtu; |
894 | err = -EMSGSIZE; | |
1da177e4 LT |
895 | goto tx_err_dst_release; |
896 | } | |
897 | ||
898 | /* | |
899 | * Okay, now see if we can stuff it in the buffer as-is. | |
900 | */ | |
901 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 902 | |
cfbba49d PM |
903 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
904 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 905 | struct sk_buff *new_skb; |
1ab1457c | 906 | |
1da177e4 LT |
907 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
908 | goto tx_err_dst_release; | |
909 | ||
910 | if (skb->sk) | |
911 | skb_set_owner_w(new_skb, skb->sk); | |
912 | kfree_skb(skb); | |
913 | skb = new_skb; | |
914 | } | |
adf30907 ED |
915 | skb_dst_drop(skb); |
916 | skb_dst_set(skb, dst_clone(dst)); | |
1da177e4 | 917 | |
b0e380b1 | 918 | skb->transport_header = skb->network_header; |
1da177e4 | 919 | |
61ec2aec | 920 | proto = fl->proto; |
6fb32dde VN |
921 | if (encap_limit >= 0) { |
922 | init_tel_txopt(&opt, encap_limit); | |
923 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
924 | } | |
e2d1bca7 ACM |
925 | skb_push(skb, sizeof(struct ipv6hdr)); |
926 | skb_reset_network_header(skb); | |
0660e03f | 927 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 928 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
929 | dsfield = INET_ECN_encapsulate(0, dsfield); |
930 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
931 | ipv6h->hop_limit = t->parms.hop_limit; |
932 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
933 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
934 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
935 | nf_reset(skb); |
936 | pkt_len = skb->len; | |
ef76bc23 | 937 | err = ip6_local_out(skb); |
1da177e4 | 938 | |
b9df3cb8 | 939 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
940 | stats->tx_bytes += pkt_len; |
941 | stats->tx_packets++; | |
942 | } else { | |
943 | stats->tx_errors++; | |
944 | stats->tx_aborted_errors++; | |
945 | } | |
946 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
947 | return 0; |
948 | tx_err_link_failure: | |
949 | stats->tx_carrier_errors++; | |
950 | dst_link_failure(skb); | |
951 | tx_err_dst_release: | |
952 | dst_release(dst); | |
61ec2aec YK |
953 | return err; |
954 | } | |
955 | ||
c4d3efaf YK |
956 | static inline int |
957 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
958 | { | |
959 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 960 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
961 | int encap_limit = -1; |
962 | struct flowi fl; | |
963 | __u8 dsfield; | |
964 | __u32 mtu; | |
965 | int err; | |
966 | ||
502b0935 YK |
967 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
968 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
969 | return -1; |
970 | ||
971 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
972 | encap_limit = t->parms.encap_limit; | |
973 | ||
974 | memcpy(&fl, &t->fl, sizeof (fl)); | |
975 | fl.proto = IPPROTO_IPIP; | |
976 | ||
977 | dsfield = ipv4_get_dsfield(iph); | |
978 | ||
979 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
980 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
981 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
982 | |
983 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
984 | if (err != 0) { | |
985 | /* XXX: send ICMP error even if DF is not set. */ | |
986 | if (err == -EMSGSIZE) | |
987 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
988 | htonl(mtu)); | |
989 | return -1; | |
990 | } | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
61ec2aec YK |
995 | static inline int |
996 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
997 | { | |
998 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 999 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1000 | int encap_limit = -1; |
1001 | __u16 offset; | |
1002 | struct flowi fl; | |
1003 | __u8 dsfield; | |
1004 | __u32 mtu; | |
1005 | int err; | |
1006 | ||
502b0935 YK |
1007 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1008 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1009 | return -1; |
1010 | ||
d56f90a7 ACM |
1011 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1012 | if (offset > 0) { | |
61ec2aec | 1013 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1014 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1015 | if (tel->encap_limit == 0) { |
1016 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1017 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1018 | return -1; |
1019 | } | |
1020 | encap_limit = tel->encap_limit - 1; | |
1021 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1022 | encap_limit = t->parms.encap_limit; | |
1023 | ||
1024 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1025 | fl.proto = IPPROTO_IPV6; | |
1026 | ||
1027 | dsfield = ipv6_get_dsfield(ipv6h); | |
1028 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1029 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1030 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1031 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1032 | ||
1033 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1034 | if (err != 0) { | |
1035 | if (err == -EMSGSIZE) | |
3ffe533c | 1036 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1037 | return -1; |
1038 | } | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
6fef4c0c | 1043 | static netdev_tx_t |
61ec2aec YK |
1044 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1045 | { | |
1046 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1047 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1048 | int ret; |
1049 | ||
61ec2aec | 1050 | switch (skb->protocol) { |
60678040 | 1051 | case htons(ETH_P_IP): |
c4d3efaf YK |
1052 | ret = ip4ip6_tnl_xmit(skb, dev); |
1053 | break; | |
60678040 | 1054 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1055 | ret = ip6ip6_tnl_xmit(skb, dev); |
1056 | break; | |
1057 | default: | |
1058 | goto tx_err; | |
1059 | } | |
1060 | ||
1061 | if (ret < 0) | |
1062 | goto tx_err; | |
1063 | ||
6ed10654 | 1064 | return NETDEV_TX_OK; |
61ec2aec | 1065 | |
1da177e4 LT |
1066 | tx_err: |
1067 | stats->tx_errors++; | |
1068 | stats->tx_dropped++; | |
1069 | kfree_skb(skb); | |
6ed10654 | 1070 | return NETDEV_TX_OK; |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1074 | { | |
1075 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1076 | int ltype = ipv6_addr_type(&p->laddr); |
1077 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1078 | |
1079 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1080 | ||
09c6bbf0 VN |
1081 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1082 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1083 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1084 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1085 | if (ltype&IPV6_ADDR_UNICAST) |
1086 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1087 | if (rtype&IPV6_ADDR_UNICAST) | |
1088 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1089 | } |
1090 | } | |
1091 | ||
3144581c | 1092 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1093 | { |
1094 | struct net_device *dev = t->dev; | |
1095 | struct ip6_tnl_parm *p = &t->parms; | |
1096 | struct flowi *fl = &t->fl; | |
1097 | ||
3a6d54c5 JP |
1098 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1099 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1100 | |
1101 | /* Set up flowi template */ | |
1102 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1103 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1104 | fl->oif = p->link; | |
1105 | fl->fl6_flowlabel = 0; | |
1106 | ||
1107 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1108 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1109 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1110 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1111 | ||
1112 | ip6_tnl_set_cap(t); | |
1113 | ||
1114 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1115 | dev->flags |= IFF_POINTOPOINT; | |
1116 | else | |
1117 | dev->flags &= ~IFF_POINTOPOINT; | |
1118 | ||
1119 | dev->iflink = p->link; | |
1120 | ||
1121 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1122 | int strict = (ipv6_addr_type(&p->raddr) & |
1123 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1124 | ||
2f7f54b7 PE |
1125 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1126 | &p->raddr, &p->laddr, | |
305d4b3c | 1127 | p->link, strict); |
1da177e4 LT |
1128 | |
1129 | if (rt == NULL) | |
1130 | return; | |
1131 | ||
1132 | if (rt->rt6i_dev) { | |
1133 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1134 | sizeof (struct ipv6hdr); | |
1135 | ||
1136 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1137 | ||
1138 | if (dev->mtu < IPV6_MIN_MTU) | |
1139 | dev->mtu = IPV6_MIN_MTU; | |
1140 | } | |
1141 | dst_release(&rt->u.dst); | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /** | |
3144581c | 1146 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1147 | * @t: tunnel to be changed |
1148 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1149 | * |
1150 | * Description: | |
3144581c | 1151 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1152 | **/ |
1153 | ||
1154 | static int | |
3144581c | 1155 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1156 | { |
1157 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1158 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1159 | t->parms.flags = p->flags; | |
1160 | t->parms.hop_limit = p->hop_limit; | |
1161 | t->parms.encap_limit = p->encap_limit; | |
1162 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1163 | t->parms.link = p->link; |
502b0935 | 1164 | t->parms.proto = p->proto; |
0c088890 | 1165 | ip6_tnl_dst_reset(t); |
3144581c | 1166 | ip6_tnl_link_config(t); |
1da177e4 LT |
1167 | return 0; |
1168 | } | |
1169 | ||
1170 | /** | |
3144581c | 1171 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1172 | * @dev: virtual device associated with tunnel |
1173 | * @ifr: parameters passed from userspace | |
1174 | * @cmd: command to be performed | |
1175 | * | |
1176 | * Description: | |
3144581c | 1177 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1178 | * from userspace. |
1da177e4 LT |
1179 | * |
1180 | * The possible commands are the following: | |
1181 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1182 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1183 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1184 | * %SIOCDELTUNNEL: delete tunnel | |
1185 | * | |
1ab1457c | 1186 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1187 | * initialization, can be used for creating other tunnel devices. |
1188 | * | |
1189 | * Return: | |
1190 | * 0 on success, | |
1191 | * %-EFAULT if unable to copy data to or from userspace, | |
1192 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1193 | * %-EINVAL if passed tunnel parameters are invalid, | |
1194 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1195 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1196 | **/ | |
1197 | ||
1198 | static int | |
3144581c | 1199 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1200 | { |
1201 | int err = 0; | |
1da177e4 LT |
1202 | struct ip6_tnl_parm p; |
1203 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1204 | struct net *net = dev_net(dev); |
1205 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1206 | |
1207 | switch (cmd) { | |
1208 | case SIOCGETTUNNEL: | |
15820e12 | 1209 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1210 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1211 | err = -EFAULT; |
1212 | break; | |
1213 | } | |
2dd02c89 | 1214 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1215 | } |
1216 | if (t == NULL) | |
2941a486 | 1217 | t = netdev_priv(dev); |
1da177e4 LT |
1218 | memcpy(&p, &t->parms, sizeof (p)); |
1219 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1220 | err = -EFAULT; | |
1221 | } | |
1222 | break; | |
1223 | case SIOCADDTUNNEL: | |
1224 | case SIOCCHGTUNNEL: | |
1225 | err = -EPERM; | |
1da177e4 LT |
1226 | if (!capable(CAP_NET_ADMIN)) |
1227 | break; | |
567131a7 VN |
1228 | err = -EFAULT; |
1229 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1230 | break; |
567131a7 | 1231 | err = -EINVAL; |
502b0935 YK |
1232 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1233 | p.proto != 0) | |
1da177e4 | 1234 | break; |
2dd02c89 | 1235 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1236 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1237 | if (t != NULL) { |
1238 | if (t->dev != dev) { | |
1239 | err = -EEXIST; | |
1240 | break; | |
1241 | } | |
1242 | } else | |
1243 | t = netdev_priv(dev); | |
1244 | ||
2dd02c89 | 1245 | ip6_tnl_unlink(ip6n, t); |
3144581c | 1246 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1247 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1248 | netdev_state_change(dev); |
1249 | } | |
567131a7 | 1250 | if (t) { |
1da177e4 | 1251 | err = 0; |
567131a7 VN |
1252 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1253 | err = -EFAULT; | |
1254 | ||
1255 | } else | |
1256 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1257 | break; |
1258 | case SIOCDELTUNNEL: | |
1259 | err = -EPERM; | |
1260 | if (!capable(CAP_NET_ADMIN)) | |
1261 | break; | |
1262 | ||
15820e12 | 1263 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1264 | err = -EFAULT; |
1265 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1266 | break; |
567131a7 | 1267 | err = -ENOENT; |
2dd02c89 | 1268 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1269 | break; |
567131a7 | 1270 | err = -EPERM; |
15820e12 | 1271 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1272 | break; |
567131a7 | 1273 | dev = t->dev; |
1da177e4 | 1274 | } |
22f8cde5 SH |
1275 | err = 0; |
1276 | unregister_netdevice(dev); | |
1da177e4 LT |
1277 | break; |
1278 | default: | |
1279 | err = -EINVAL; | |
1280 | } | |
1281 | return err; | |
1282 | } | |
1283 | ||
1da177e4 | 1284 | /** |
3144581c | 1285 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1286 | * @dev: virtual device associated with tunnel |
1287 | * @new_mtu: the new mtu | |
1288 | * | |
1289 | * Return: | |
1290 | * 0 on success, | |
1291 | * %-EINVAL if mtu too small | |
1292 | **/ | |
1293 | ||
1294 | static int | |
3144581c | 1295 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1296 | { |
1297 | if (new_mtu < IPV6_MIN_MTU) { | |
1298 | return -EINVAL; | |
1299 | } | |
1300 | dev->mtu = new_mtu; | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1326c3d5 SH |
1304 | |
1305 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
1306 | .ndo_uninit = ip6_tnl_dev_uninit, | |
1307 | .ndo_start_xmit = ip6_tnl_xmit, | |
1308 | .ndo_do_ioctl = ip6_tnl_ioctl, | |
1309 | .ndo_change_mtu = ip6_tnl_change_mtu, | |
1310 | }; | |
1311 | ||
1da177e4 | 1312 | /** |
3144581c | 1313 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1314 | * @dev: virtual device associated with tunnel |
1315 | * | |
1316 | * Description: | |
1317 | * Initialize function pointers and device parameters | |
1318 | **/ | |
1319 | ||
3144581c | 1320 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1321 | { |
1326c3d5 | 1322 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
1da177e4 | 1323 | dev->destructor = free_netdev; |
1da177e4 LT |
1324 | |
1325 | dev->type = ARPHRD_TUNNEL6; | |
1326 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1327 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1328 | dev->flags |= IFF_NOARP; | |
1329 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1330 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1331 | } |
1332 | ||
1333 | ||
1334 | /** | |
3144581c | 1335 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1336 | * @dev: virtual device associated with tunnel |
1337 | **/ | |
1338 | ||
1339 | static inline void | |
3144581c | 1340 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1341 | { |
2941a486 | 1342 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1343 | t->dev = dev; |
1344 | strcpy(t->parms.name, dev->name); | |
1345 | } | |
1346 | ||
1347 | /** | |
3144581c | 1348 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1349 | * @dev: virtual device associated with tunnel |
1350 | **/ | |
1351 | ||
1326c3d5 | 1352 | static void ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1353 | { |
2941a486 | 1354 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1355 | ip6_tnl_dev_init_gen(dev); |
1356 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1357 | } |
1358 | ||
1359 | /** | |
3144581c | 1360 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1361 | * @dev: fallback device |
1362 | * | |
1363 | * Return: 0 | |
1364 | **/ | |
1365 | ||
2c8c1e72 | 1366 | static void __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1367 | { |
2941a486 | 1368 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1369 | struct net *net = dev_net(dev); |
1370 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1371 | ||
3144581c | 1372 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1373 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1374 | dev_hold(dev); |
3e6c9fb5 | 1375 | ip6n->tnls_wc[0] = t; |
1da177e4 LT |
1376 | } |
1377 | ||
c4d3efaf YK |
1378 | static struct xfrm6_tunnel ip4ip6_handler = { |
1379 | .handler = ip4ip6_rcv, | |
1380 | .err_handler = ip4ip6_err, | |
1381 | .priority = 1, | |
1382 | }; | |
1383 | ||
1da177e4 | 1384 | static struct xfrm6_tunnel ip6ip6_handler = { |
0303770d PM |
1385 | .handler = ip6ip6_rcv, |
1386 | .err_handler = ip6ip6_err, | |
d2acc347 | 1387 | .priority = 1, |
1da177e4 LT |
1388 | }; |
1389 | ||
2c8c1e72 | 1390 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1391 | { |
1392 | int h; | |
1393 | struct ip6_tnl *t; | |
cf4432f5 | 1394 | LIST_HEAD(list); |
3e6c9fb5 PE |
1395 | |
1396 | for (h = 0; h < HASH_SIZE; h++) { | |
cf4432f5 ED |
1397 | t = ip6n->tnls_r_l[h]; |
1398 | while (t != NULL) { | |
1399 | unregister_netdevice_queue(t->dev, &list); | |
1400 | t = t->next; | |
1401 | } | |
3e6c9fb5 PE |
1402 | } |
1403 | ||
1404 | t = ip6n->tnls_wc[0]; | |
cf4432f5 ED |
1405 | unregister_netdevice_queue(t->dev, &list); |
1406 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1407 | } |
1408 | ||
2c8c1e72 | 1409 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1410 | { |
ac31cd3c | 1411 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1412 | int err; |
13eeb8e9 | 1413 | |
3e6c9fb5 PE |
1414 | ip6n->tnls[0] = ip6n->tnls_wc; |
1415 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1416 | ||
15820e12 PE |
1417 | err = -ENOMEM; |
1418 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1419 | ip6_tnl_dev_setup); | |
1420 | ||
1421 | if (!ip6n->fb_tnl_dev) | |
1422 | goto err_alloc_dev; | |
be77e593 | 1423 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1424 | |
1326c3d5 | 1425 | ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
15820e12 PE |
1426 | |
1427 | err = register_netdev(ip6n->fb_tnl_dev); | |
1428 | if (err < 0) | |
1429 | goto err_register; | |
13eeb8e9 PE |
1430 | return 0; |
1431 | ||
15820e12 PE |
1432 | err_register: |
1433 | free_netdev(ip6n->fb_tnl_dev); | |
1434 | err_alloc_dev: | |
13eeb8e9 PE |
1435 | return err; |
1436 | } | |
1437 | ||
2c8c1e72 | 1438 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1439 | { |
ac31cd3c | 1440 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1441 | |
3e6c9fb5 PE |
1442 | rtnl_lock(); |
1443 | ip6_tnl_destroy_tunnels(ip6n); | |
1444 | rtnl_unlock(); | |
13eeb8e9 PE |
1445 | } |
1446 | ||
1447 | static struct pernet_operations ip6_tnl_net_ops = { | |
1448 | .init = ip6_tnl_init_net, | |
1449 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1450 | .id = &ip6_tnl_net_id, |
1451 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1452 | }; |
1453 | ||
1da177e4 LT |
1454 | /** |
1455 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1456 | * | |
1457 | * Return: 0 on success | |
1458 | **/ | |
1459 | ||
1460 | static int __init ip6_tunnel_init(void) | |
1461 | { | |
1462 | int err; | |
1463 | ||
d5aa407f AD |
1464 | err = register_pernet_device(&ip6_tnl_net_ops); |
1465 | if (err < 0) | |
1466 | goto out_pernet; | |
1467 | ||
1468 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1469 | if (err < 0) { | |
3144581c | 1470 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1471 | goto out_ip4ip6; |
c4d3efaf YK |
1472 | } |
1473 | ||
d5aa407f AD |
1474 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1475 | if (err < 0) { | |
3144581c | 1476 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1477 | goto out_ip6ip6; |
1da177e4 | 1478 | } |
13eeb8e9 | 1479 | |
1da177e4 | 1480 | return 0; |
d5aa407f AD |
1481 | |
1482 | out_ip6ip6: | |
c4d3efaf | 1483 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1484 | out_ip4ip6: |
1485 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1486 | out_pernet: | |
1da177e4 LT |
1487 | return err; |
1488 | } | |
1489 | ||
1490 | /** | |
1491 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1492 | **/ | |
1493 | ||
1494 | static void __exit ip6_tunnel_cleanup(void) | |
1495 | { | |
c4d3efaf | 1496 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1497 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1498 | |
73d605d1 | 1499 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1500 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1501 | |
ac31cd3c | 1502 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1503 | } |
1504 | ||
1505 | module_init(ip6_tunnel_init); | |
1506 | module_exit(ip6_tunnel_cleanup); |