Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 LT |
8 | * |
9 | * $Id$ | |
10 | * | |
11 | * Based on: | |
c4d3efaf | 12 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
13 | * |
14 | * RFC 2473 | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | */ | |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/if_tunnel.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/in6.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/if_arp.h> | |
37 | #include <linux/icmpv6.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/route.h> | |
40 | #include <linux/rtnetlink.h> | |
41 | #include <linux/netfilter_ipv6.h> | |
42 | ||
43 | #include <asm/uaccess.h> | |
44 | #include <asm/atomic.h> | |
45 | ||
c4d3efaf | 46 | #include <net/icmp.h> |
1da177e4 LT |
47 | #include <net/ip.h> |
48 | #include <net/ipv6.h> | |
1da177e4 LT |
49 | #include <net/ip6_route.h> |
50 | #include <net/addrconf.h> | |
51 | #include <net/ip6_tunnel.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/dsfield.h> | |
54 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
55 | #include <net/net_namespace.h> |
56 | #include <net/netns/generic.h> | |
1da177e4 LT |
57 | |
58 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 59 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 LT |
60 | MODULE_LICENSE("GPL"); |
61 | ||
62 | #define IPV6_TLV_TEL_DST_SIZE 8 | |
63 | ||
64 | #ifdef IP6_TNL_DEBUG | |
0dc47877 | 65 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
66 | #else |
67 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
68 | #endif | |
69 | ||
70 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 71 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
72 | |
73 | #define HASH_SIZE 32 | |
74 | ||
e69a4adc | 75 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
76 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
77 | (HASH_SIZE - 1)) | |
1da177e4 | 78 | |
3144581c YK |
79 | static int ip6_fb_tnl_dev_init(struct net_device *dev); |
80 | static int ip6_tnl_dev_init(struct net_device *dev); | |
81 | static void ip6_tnl_dev_setup(struct net_device *dev); | |
1da177e4 | 82 | |
13eeb8e9 PE |
83 | static int ip6_tnl_net_id; |
84 | struct ip6_tnl_net { | |
15820e12 PE |
85 | /* the IPv6 tunnel fallback device */ |
86 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 PE |
87 | /* lists for storing tunnels in use */ |
88 | struct ip6_tnl *tnls_r_l[HASH_SIZE]; | |
89 | struct ip6_tnl *tnls_wc[1]; | |
90 | struct ip6_tnl **tnls[2]; | |
13eeb8e9 PE |
91 | }; |
92 | ||
1da177e4 | 93 | /* lock for the tunnel lists */ |
3144581c | 94 | static DEFINE_RWLOCK(ip6_tnl_lock); |
1da177e4 LT |
95 | |
96 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
97 | { | |
98 | struct dst_entry *dst = t->dst_cache; | |
99 | ||
1ab1457c | 100 | if (dst && dst->obsolete && |
1da177e4 LT |
101 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
102 | t->dst_cache = NULL; | |
103 | dst_release(dst); | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | return dst; | |
108 | } | |
109 | ||
110 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
111 | { | |
112 | dst_release(t->dst_cache); | |
113 | t->dst_cache = NULL; | |
114 | } | |
115 | ||
116 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
117 | { | |
118 | struct rt6_info *rt = (struct rt6_info *) dst; | |
119 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
120 | dst_release(t->dst_cache); | |
121 | t->dst_cache = dst; | |
122 | } | |
123 | ||
124 | /** | |
3144581c | 125 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
126 | * @remote: the address of the tunnel exit-point |
127 | * @local: the address of the tunnel entry-point | |
1da177e4 | 128 | * |
1ab1457c | 129 | * Return: |
1da177e4 | 130 | * tunnel matching given end-points if found, |
1ab1457c | 131 | * else fallback tunnel if its device is up, |
1da177e4 LT |
132 | * else %NULL |
133 | **/ | |
134 | ||
135 | static struct ip6_tnl * | |
2dd02c89 | 136 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 LT |
137 | { |
138 | unsigned h0 = HASH(remote); | |
139 | unsigned h1 = HASH(local); | |
140 | struct ip6_tnl *t; | |
3e6c9fb5 | 141 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 142 | |
3e6c9fb5 | 143 | for (t = ip6n->tnls_r_l[h0 ^ h1]; t; t = t->next) { |
1da177e4 LT |
144 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
145 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
146 | (t->dev->flags & IFF_UP)) | |
147 | return t; | |
148 | } | |
3e6c9fb5 | 149 | if ((t = ip6n->tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
150 | return t; |
151 | ||
152 | return NULL; | |
153 | } | |
154 | ||
155 | /** | |
3144581c | 156 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 157 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
158 | * |
159 | * Description: | |
3144581c | 160 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
161 | * &struct in6_addr entries laddr and raddr in @p. |
162 | * | |
1ab1457c | 163 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
164 | **/ |
165 | ||
166 | static struct ip6_tnl ** | |
2dd02c89 | 167 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
168 | { |
169 | struct in6_addr *remote = &p->raddr; | |
170 | struct in6_addr *local = &p->laddr; | |
171 | unsigned h = 0; | |
172 | int prio = 0; | |
173 | ||
174 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
175 | prio = 1; | |
176 | h = HASH(remote) ^ HASH(local); | |
177 | } | |
3e6c9fb5 | 178 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
179 | } |
180 | ||
181 | /** | |
3144581c | 182 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
183 | * @t: tunnel to be added |
184 | **/ | |
185 | ||
186 | static void | |
2dd02c89 | 187 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 188 | { |
2dd02c89 | 189 | struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 LT |
190 | |
191 | t->next = *tp; | |
3144581c | 192 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 193 | *tp = t; |
3144581c | 194 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
195 | } |
196 | ||
197 | /** | |
3144581c | 198 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
199 | * @t: tunnel to be removed |
200 | **/ | |
201 | ||
202 | static void | |
2dd02c89 | 203 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 LT |
204 | { |
205 | struct ip6_tnl **tp; | |
206 | ||
2dd02c89 | 207 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { |
1da177e4 | 208 | if (t == *tp) { |
3144581c | 209 | write_lock_bh(&ip6_tnl_lock); |
1da177e4 | 210 | *tp = t->next; |
3144581c | 211 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 LT |
212 | break; |
213 | } | |
214 | } | |
215 | } | |
216 | ||
217 | /** | |
218 | * ip6_tnl_create() - create a new tunnel | |
219 | * @p: tunnel parameters | |
220 | * @pt: pointer to new tunnel | |
221 | * | |
222 | * Description: | |
223 | * Create tunnel matching given parameters. | |
1ab1457c YH |
224 | * |
225 | * Return: | |
567131a7 | 226 | * created tunnel or NULL |
1da177e4 LT |
227 | **/ |
228 | ||
2dd02c89 | 229 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
230 | { |
231 | struct net_device *dev; | |
232 | struct ip6_tnl *t; | |
233 | char name[IFNAMSIZ]; | |
234 | int err; | |
2dd02c89 | 235 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 236 | |
34cc7ba6 | 237 | if (p->name[0]) |
1da177e4 | 238 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
239 | else |
240 | sprintf(name, "ip6tnl%%d"); | |
241 | ||
3144581c | 242 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 243 | if (dev == NULL) |
567131a7 | 244 | goto failed; |
1da177e4 | 245 | |
554eb277 PE |
246 | dev_net_set(dev, net); |
247 | ||
b37d428b PE |
248 | if (strchr(name, '%')) { |
249 | if (dev_alloc_name(dev, name) < 0) | |
250 | goto failed_free; | |
251 | } | |
252 | ||
2941a486 | 253 | t = netdev_priv(dev); |
3144581c | 254 | dev->init = ip6_tnl_dev_init; |
1da177e4 LT |
255 | t->parms = *p; |
256 | ||
b37d428b PE |
257 | if ((err = register_netdevice(dev)) < 0) |
258 | goto failed_free; | |
259 | ||
1da177e4 | 260 | dev_hold(dev); |
2dd02c89 | 261 | ip6_tnl_link(ip6n, t); |
567131a7 | 262 | return t; |
b37d428b PE |
263 | |
264 | failed_free: | |
265 | free_netdev(dev); | |
567131a7 VN |
266 | failed: |
267 | return NULL; | |
1da177e4 LT |
268 | } |
269 | ||
270 | /** | |
3144581c | 271 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 272 | * @p: tunnel parameters |
1da177e4 LT |
273 | * @create: != 0 if allowed to create new tunnel if no match found |
274 | * | |
275 | * Description: | |
3144581c | 276 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
277 | * based on @parms. If this is unsuccessful, but @create is set a new |
278 | * tunnel device is created and registered for use. | |
279 | * | |
280 | * Return: | |
567131a7 | 281 | * matching tunnel or NULL |
1da177e4 LT |
282 | **/ |
283 | ||
2dd02c89 PE |
284 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
285 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
286 | { |
287 | struct in6_addr *remote = &p->raddr; | |
288 | struct in6_addr *local = &p->laddr; | |
289 | struct ip6_tnl *t; | |
2dd02c89 | 290 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 291 | |
2dd02c89 | 292 | for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) { |
1da177e4 | 293 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
294 | ipv6_addr_equal(remote, &t->parms.raddr)) |
295 | return t; | |
1da177e4 LT |
296 | } |
297 | if (!create) | |
567131a7 | 298 | return NULL; |
2dd02c89 | 299 | return ip6_tnl_create(net, p); |
1da177e4 LT |
300 | } |
301 | ||
302 | /** | |
3144581c | 303 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 304 | * @dev: the device to be destroyed |
1ab1457c | 305 | * |
1da177e4 | 306 | * Description: |
3144581c | 307 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
308 | **/ |
309 | ||
310 | static void | |
3144581c | 311 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 312 | { |
2941a486 | 313 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
314 | struct net *net = dev_net(dev); |
315 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 316 | |
15820e12 | 317 | if (dev == ip6n->fb_tnl_dev) { |
3144581c | 318 | write_lock_bh(&ip6_tnl_lock); |
3e6c9fb5 | 319 | ip6n->tnls_wc[0] = NULL; |
3144581c | 320 | write_unlock_bh(&ip6_tnl_lock); |
1da177e4 | 321 | } else { |
2dd02c89 | 322 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
323 | } |
324 | ip6_tnl_dst_reset(t); | |
325 | dev_put(dev); | |
326 | } | |
327 | ||
328 | /** | |
329 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
330 | * @skb: received socket buffer | |
331 | * | |
1ab1457c YH |
332 | * Return: |
333 | * 0 if none was found, | |
1da177e4 LT |
334 | * else index to encapsulation limit |
335 | **/ | |
336 | ||
337 | static __u16 | |
338 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
339 | { | |
340 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
341 | __u8 nexthdr = ipv6h->nexthdr; | |
342 | __u16 off = sizeof (*ipv6h); | |
343 | ||
344 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
345 | __u16 optlen = 0; | |
346 | struct ipv6_opt_hdr *hdr; | |
347 | if (raw + off + sizeof (*hdr) > skb->data && | |
348 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
349 | break; | |
350 | ||
351 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
352 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
353 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
354 | if (frag_hdr->frag_off) | |
355 | break; | |
356 | optlen = 8; | |
357 | } else if (nexthdr == NEXTHDR_AUTH) { | |
358 | optlen = (hdr->hdrlen + 2) << 2; | |
359 | } else { | |
360 | optlen = ipv6_optlen(hdr); | |
361 | } | |
362 | if (nexthdr == NEXTHDR_DEST) { | |
363 | __u16 i = off + 2; | |
364 | while (1) { | |
365 | struct ipv6_tlv_tnl_enc_lim *tel; | |
366 | ||
367 | /* No more room for encapsulation limit */ | |
368 | if (i + sizeof (*tel) > off + optlen) | |
369 | break; | |
370 | ||
371 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
372 | /* return index of option if found and valid */ | |
373 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
374 | tel->length == 1) | |
375 | return i; | |
376 | /* else jump to next option */ | |
377 | if (tel->type) | |
378 | i += tel->length + 2; | |
379 | else | |
380 | i++; | |
381 | } | |
382 | } | |
383 | nexthdr = hdr->nexthdr; | |
384 | off += optlen; | |
385 | } | |
386 | return 0; | |
387 | } | |
388 | ||
389 | /** | |
e490d1d8 | 390 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
391 | * |
392 | * Description: | |
e490d1d8 | 393 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
394 | * to the specifications in RFC 2473. |
395 | **/ | |
396 | ||
d2acc347 | 397 | static int |
502b0935 | 398 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
704eae1f | 399 | int *type, int *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
400 | { |
401 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
402 | struct ip6_tnl *t; | |
403 | int rel_msg = 0; | |
404 | int rel_type = ICMPV6_DEST_UNREACH; | |
405 | int rel_code = ICMPV6_ADDR_UNREACH; | |
406 | __u32 rel_info = 0; | |
407 | __u16 len; | |
d2acc347 | 408 | int err = -ENOENT; |
1da177e4 | 409 | |
1ab1457c YH |
410 | /* If the packet doesn't contain the original IPv6 header we are |
411 | in trouble since we might need the source address for further | |
1da177e4 LT |
412 | processing of the error. */ |
413 | ||
3144581c | 414 | read_lock(&ip6_tnl_lock); |
8704ca7e | 415 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 416 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
417 | goto out; |
418 | ||
502b0935 YK |
419 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
420 | goto out; | |
421 | ||
d2acc347 HX |
422 | err = 0; |
423 | ||
e490d1d8 | 424 | switch (*type) { |
1da177e4 LT |
425 | __u32 teli; |
426 | struct ipv6_tlv_tnl_enc_lim *tel; | |
427 | __u32 mtu; | |
428 | case ICMPV6_DEST_UNREACH: | |
429 | if (net_ratelimit()) | |
430 | printk(KERN_WARNING | |
431 | "%s: Path to destination invalid " | |
432 | "or inactive!\n", t->parms.name); | |
433 | rel_msg = 1; | |
434 | break; | |
435 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 436 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
437 | if (net_ratelimit()) |
438 | printk(KERN_WARNING | |
439 | "%s: Too small hop limit or " | |
1ab1457c | 440 | "routing loop in tunnel!\n", |
1da177e4 LT |
441 | t->parms.name); |
442 | rel_msg = 1; | |
443 | } | |
444 | break; | |
445 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 446 | teli = 0; |
e490d1d8 | 447 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 448 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 449 | |
704eae1f | 450 | if (teli && teli == *info - 2) { |
1da177e4 LT |
451 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
452 | if (tel->encap_limit == 0) { | |
453 | if (net_ratelimit()) | |
454 | printk(KERN_WARNING | |
455 | "%s: Too small encapsulation " | |
456 | "limit or routing loop in " | |
457 | "tunnel!\n", t->parms.name); | |
458 | rel_msg = 1; | |
459 | } | |
107a5fe6 VN |
460 | } else if (net_ratelimit()) { |
461 | printk(KERN_WARNING | |
462 | "%s: Recipient unable to parse tunneled " | |
463 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
464 | } |
465 | break; | |
466 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 467 | mtu = *info - offset; |
1da177e4 LT |
468 | if (mtu < IPV6_MIN_MTU) |
469 | mtu = IPV6_MIN_MTU; | |
470 | t->dev->mtu = mtu; | |
471 | ||
cc6cdac0 | 472 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
473 | rel_type = ICMPV6_PKT_TOOBIG; |
474 | rel_code = 0; | |
475 | rel_info = mtu; | |
476 | rel_msg = 1; | |
477 | } | |
478 | break; | |
479 | } | |
e490d1d8 YK |
480 | |
481 | *type = rel_type; | |
482 | *code = rel_code; | |
483 | *info = rel_info; | |
484 | *msg = rel_msg; | |
485 | ||
486 | out: | |
3144581c | 487 | read_unlock(&ip6_tnl_lock); |
e490d1d8 YK |
488 | return err; |
489 | } | |
490 | ||
c4d3efaf YK |
491 | static int |
492 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
704eae1f | 493 | int type, int code, int offset, __be32 info) |
c4d3efaf YK |
494 | { |
495 | int rel_msg = 0; | |
496 | int rel_type = type; | |
497 | int rel_code = code; | |
704eae1f | 498 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
499 | int err; |
500 | struct sk_buff *skb2; | |
501 | struct iphdr *eiph; | |
502 | struct flowi fl; | |
503 | struct rtable *rt; | |
504 | ||
502b0935 YK |
505 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
506 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
507 | if (err < 0) |
508 | return err; | |
509 | ||
510 | if (rel_msg == 0) | |
511 | return 0; | |
512 | ||
513 | switch (rel_type) { | |
514 | case ICMPV6_DEST_UNREACH: | |
515 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
516 | return 0; | |
517 | rel_type = ICMP_DEST_UNREACH; | |
518 | rel_code = ICMP_HOST_UNREACH; | |
519 | break; | |
520 | case ICMPV6_PKT_TOOBIG: | |
521 | if (rel_code != 0) | |
522 | return 0; | |
523 | rel_type = ICMP_DEST_UNREACH; | |
524 | rel_code = ICMP_FRAG_NEEDED; | |
525 | break; | |
526 | default: | |
527 | return 0; | |
528 | } | |
529 | ||
530 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
531 | return 0; | |
532 | ||
533 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
534 | if (!skb2) | |
535 | return 0; | |
536 | ||
537 | dst_release(skb2->dst); | |
538 | skb2->dst = NULL; | |
539 | skb_pull(skb2, offset); | |
c1d2bbe1 | 540 | skb_reset_network_header(skb2); |
eddc9ec5 | 541 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
542 | |
543 | /* Try to guess incoming interface */ | |
544 | memset(&fl, 0, sizeof(fl)); | |
545 | fl.fl4_dst = eiph->saddr; | |
546 | fl.fl4_tos = RT_TOS(eiph->tos); | |
547 | fl.proto = IPPROTO_IPIP; | |
2f7f54b7 | 548 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) |
c4d3efaf YK |
549 | goto out; |
550 | ||
551 | skb2->dev = rt->u.dst.dev; | |
552 | ||
553 | /* route "incoming" packet */ | |
554 | if (rt->rt_flags & RTCF_LOCAL) { | |
555 | ip_rt_put(rt); | |
556 | rt = NULL; | |
557 | fl.fl4_dst = eiph->daddr; | |
558 | fl.fl4_src = eiph->saddr; | |
559 | fl.fl4_tos = eiph->tos; | |
2f7f54b7 | 560 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || |
c4d3efaf YK |
561 | rt->u.dst.dev->type != ARPHRD_TUNNEL) { |
562 | ip_rt_put(rt); | |
563 | goto out; | |
564 | } | |
9937ded8 | 565 | skb2->dst = (struct dst_entry *)rt; |
c4d3efaf YK |
566 | } else { |
567 | ip_rt_put(rt); | |
568 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
569 | skb2->dev) || | |
570 | skb2->dst->dev->type != ARPHRD_TUNNEL) | |
571 | goto out; | |
572 | } | |
573 | ||
574 | /* change mtu on this route */ | |
575 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
576 | if (rel_info > dst_mtu(skb2->dst)) | |
577 | goto out; | |
578 | ||
579 | skb2->dst->ops->update_pmtu(skb2->dst, rel_info); | |
c4d3efaf YK |
580 | } |
581 | ||
704eae1f | 582 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
583 | |
584 | out: | |
585 | kfree_skb(skb2); | |
586 | return 0; | |
587 | } | |
588 | ||
e490d1d8 YK |
589 | static int |
590 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
704eae1f | 591 | int type, int code, int offset, __be32 info) |
e490d1d8 YK |
592 | { |
593 | int rel_msg = 0; | |
594 | int rel_type = type; | |
595 | int rel_code = code; | |
704eae1f | 596 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
597 | int err; |
598 | ||
502b0935 YK |
599 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
600 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
601 | if (err < 0) |
602 | return err; | |
603 | ||
604 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
605 | struct rt6_info *rt; |
606 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 607 | |
1da177e4 | 608 | if (!skb2) |
e490d1d8 | 609 | return 0; |
1da177e4 LT |
610 | |
611 | dst_release(skb2->dst); | |
612 | skb2->dst = NULL; | |
613 | skb_pull(skb2, offset); | |
c1d2bbe1 | 614 | skb_reset_network_header(skb2); |
1da177e4 LT |
615 | |
616 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
617 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
618 | NULL, 0, 0); | |
1da177e4 LT |
619 | |
620 | if (rt && rt->rt6i_dev) | |
621 | skb2->dev = rt->rt6i_dev; | |
622 | ||
623 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
624 | ||
625 | if (rt) | |
626 | dst_release(&rt->u.dst); | |
627 | ||
628 | kfree_skb(skb2); | |
629 | } | |
e490d1d8 YK |
630 | |
631 | return 0; | |
1da177e4 LT |
632 | } |
633 | ||
c4d3efaf YK |
634 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
635 | struct ipv6hdr *ipv6h, | |
636 | struct sk_buff *skb) | |
637 | { | |
638 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
639 | ||
640 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 641 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
642 | |
643 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 644 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
645 | } |
646 | ||
8359925b YK |
647 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
648 | struct ipv6hdr *ipv6h, | |
649 | struct sk_buff *skb) | |
1da177e4 | 650 | { |
8359925b | 651 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 652 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 653 | |
8359925b | 654 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 655 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 656 | } |
8359925b | 657 | |
09c6bbf0 VN |
658 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
659 | { | |
660 | struct ip6_tnl_parm *p = &t->parms; | |
661 | int ret = 0; | |
2f7f54b7 | 662 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
663 | |
664 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 665 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
666 | |
667 | if (p->link) | |
2f7f54b7 | 668 | ldev = dev_get_by_index(net, p->link); |
09c6bbf0 VN |
669 | |
670 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
671 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
672 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
673 | ret = 1; |
674 | ||
675 | if (ldev) | |
676 | dev_put(ldev); | |
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 | |
3144581c | 699 | read_lock(&ip6_tnl_lock); |
1da177e4 | 700 | |
8704ca7e | 701 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 702 | &ipv6h->daddr)) != NULL) { |
502b0935 YK |
703 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
704 | read_unlock(&ip6_tnl_lock); | |
705 | goto discard; | |
706 | } | |
707 | ||
1da177e4 | 708 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
3144581c | 709 | read_unlock(&ip6_tnl_lock); |
50fba2aa | 710 | goto discard; |
1da177e4 LT |
711 | } |
712 | ||
09c6bbf0 | 713 | if (!ip6_tnl_rcv_ctl(t)) { |
1da177e4 | 714 | t->stat.rx_dropped++; |
3144581c | 715 | read_unlock(&ip6_tnl_lock); |
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)); | |
724 | skb->dev = t->dev; | |
725 | dst_release(skb->dst); | |
726 | skb->dst = NULL; | |
53ab61c6 | 727 | nf_reset(skb); |
8359925b YK |
728 | |
729 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
730 | ||
1da177e4 LT |
731 | t->stat.rx_packets++; |
732 | t->stat.rx_bytes += skb->len; | |
733 | netif_rx(skb); | |
3144581c | 734 | read_unlock(&ip6_tnl_lock); |
1da177e4 LT |
735 | return 0; |
736 | } | |
3144581c | 737 | read_unlock(&ip6_tnl_lock); |
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 | ||
805 | if (p->link) | |
2f7f54b7 | 806 | ldev = dev_get_by_index(net, p->link); |
09c6bbf0 | 807 | |
2f7f54b7 | 808 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
809 | printk(KERN_WARNING |
810 | "%s xmit: Local address not yet configured!\n", | |
811 | p->name); | |
812 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 813 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
814 | printk(KERN_WARNING |
815 | "%s xmit: Routing loop! " | |
816 | "Remote address found on this node!\n", | |
817 | p->name); | |
818 | else | |
819 | ret = 1; | |
820 | if (ldev) | |
821 | dev_put(ldev); | |
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 | { |
2941a486 | 851 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 | 852 | struct net_device_stats *stats = &t->stat; |
0660e03f | 853 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 854 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
855 | struct dst_entry *dst; |
856 | struct net_device *tdev; | |
857 | int mtu; | |
c2636b4d | 858 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 859 | u8 proto; |
61ec2aec | 860 | int err = -1; |
1da177e4 | 861 | int pkt_len; |
1da177e4 | 862 | |
1da177e4 LT |
863 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
864 | dst_hold(dst); | |
a57ebc90 | 865 | else { |
2f7f54b7 | 866 | dst = ip6_route_output(dev_net(dev), NULL, fl); |
1da177e4 | 867 | |
61ec2aec | 868 | if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
869 | goto tx_err_link_failure; |
870 | } | |
1da177e4 LT |
871 | |
872 | tdev = dst->dev; | |
873 | ||
874 | if (tdev == dev) { | |
875 | stats->collisions++; | |
876 | if (net_ratelimit()) | |
1ab1457c | 877 | printk(KERN_WARNING |
1da177e4 LT |
878 | "%s: Local routing loop detected!\n", |
879 | t->parms.name); | |
880 | goto tx_err_dst_release; | |
881 | } | |
882 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 883 | if (encap_limit >= 0) { |
1da177e4 LT |
884 | max_headroom += 8; |
885 | mtu -= 8; | |
886 | } | |
887 | if (mtu < IPV6_MIN_MTU) | |
888 | mtu = IPV6_MIN_MTU; | |
26892058 YK |
889 | if (skb->dst) |
890 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
1da177e4 | 891 | if (skb->len > mtu) { |
61ec2aec YK |
892 | *pmtu = mtu; |
893 | err = -EMSGSIZE; | |
1da177e4 LT |
894 | goto tx_err_dst_release; |
895 | } | |
896 | ||
897 | /* | |
898 | * Okay, now see if we can stuff it in the buffer as-is. | |
899 | */ | |
900 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 901 | |
cfbba49d PM |
902 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
903 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 904 | struct sk_buff *new_skb; |
1ab1457c | 905 | |
1da177e4 LT |
906 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
907 | goto tx_err_dst_release; | |
908 | ||
909 | if (skb->sk) | |
910 | skb_set_owner_w(new_skb, skb->sk); | |
911 | kfree_skb(skb); | |
912 | skb = new_skb; | |
913 | } | |
914 | dst_release(skb->dst); | |
915 | skb->dst = dst_clone(dst); | |
916 | ||
b0e380b1 | 917 | skb->transport_header = skb->network_header; |
1da177e4 | 918 | |
61ec2aec | 919 | proto = fl->proto; |
6fb32dde VN |
920 | if (encap_limit >= 0) { |
921 | init_tel_txopt(&opt, encap_limit); | |
922 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
923 | } | |
e2d1bca7 ACM |
924 | skb_push(skb, sizeof(struct ipv6hdr)); |
925 | skb_reset_network_header(skb); | |
0660e03f | 926 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 927 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
928 | dsfield = INET_ECN_encapsulate(0, dsfield); |
929 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
930 | ipv6h->hop_limit = t->parms.hop_limit; |
931 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
932 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
933 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
934 | nf_reset(skb); |
935 | pkt_len = skb->len; | |
ef76bc23 | 936 | err = ip6_local_out(skb); |
1da177e4 | 937 | |
b9df3cb8 | 938 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
939 | stats->tx_bytes += pkt_len; |
940 | stats->tx_packets++; | |
941 | } else { | |
942 | stats->tx_errors++; | |
943 | stats->tx_aborted_errors++; | |
944 | } | |
945 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
946 | return 0; |
947 | tx_err_link_failure: | |
948 | stats->tx_carrier_errors++; | |
949 | dst_link_failure(skb); | |
950 | tx_err_dst_release: | |
951 | dst_release(dst); | |
61ec2aec YK |
952 | return err; |
953 | } | |
954 | ||
c4d3efaf YK |
955 | static inline int |
956 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
957 | { | |
958 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 959 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
960 | int encap_limit = -1; |
961 | struct flowi fl; | |
962 | __u8 dsfield; | |
963 | __u32 mtu; | |
964 | int err; | |
965 | ||
502b0935 YK |
966 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
967 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
968 | return -1; |
969 | ||
970 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
971 | encap_limit = t->parms.encap_limit; | |
972 | ||
973 | memcpy(&fl, &t->fl, sizeof (fl)); | |
974 | fl.proto = IPPROTO_IPIP; | |
975 | ||
976 | dsfield = ipv4_get_dsfield(iph); | |
977 | ||
978 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
979 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
980 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
981 | |
982 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
983 | if (err != 0) { | |
984 | /* XXX: send ICMP error even if DF is not set. */ | |
985 | if (err == -EMSGSIZE) | |
986 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
987 | htonl(mtu)); | |
988 | return -1; | |
989 | } | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
61ec2aec YK |
994 | static inline int |
995 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
996 | { | |
997 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 998 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
999 | int encap_limit = -1; |
1000 | __u16 offset; | |
1001 | struct flowi fl; | |
1002 | __u8 dsfield; | |
1003 | __u32 mtu; | |
1004 | int err; | |
1005 | ||
502b0935 YK |
1006 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1007 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1008 | return -1; |
1009 | ||
d56f90a7 ACM |
1010 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1011 | if (offset > 0) { | |
61ec2aec | 1012 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1013 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1014 | if (tel->encap_limit == 0) { |
1015 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
1016 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
1017 | return -1; | |
1018 | } | |
1019 | encap_limit = tel->encap_limit - 1; | |
1020 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1021 | encap_limit = t->parms.encap_limit; | |
1022 | ||
1023 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1024 | fl.proto = IPPROTO_IPV6; | |
1025 | ||
1026 | dsfield = ipv6_get_dsfield(ipv6h); | |
1027 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1028 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1029 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1030 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1031 | ||
1032 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1033 | if (err != 0) { | |
1034 | if (err == -EMSGSIZE) | |
1035 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
1036 | return -1; | |
1037 | } | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | static int | |
1043 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1044 | { | |
1045 | struct ip6_tnl *t = netdev_priv(dev); | |
1046 | struct net_device_stats *stats = &t->stat; | |
1047 | int ret; | |
1048 | ||
1049 | if (t->recursion++) { | |
1050 | t->stat.collisions++; | |
1051 | goto tx_err; | |
1052 | } | |
1053 | ||
1054 | switch (skb->protocol) { | |
c4d3efaf YK |
1055 | case __constant_htons(ETH_P_IP): |
1056 | ret = ip4ip6_tnl_xmit(skb, dev); | |
1057 | break; | |
61ec2aec YK |
1058 | case __constant_htons(ETH_P_IPV6): |
1059 | ret = ip6ip6_tnl_xmit(skb, dev); | |
1060 | break; | |
1061 | default: | |
1062 | goto tx_err; | |
1063 | } | |
1064 | ||
1065 | if (ret < 0) | |
1066 | goto tx_err; | |
1067 | ||
1068 | t->recursion--; | |
1069 | return 0; | |
1070 | ||
1da177e4 LT |
1071 | tx_err: |
1072 | stats->tx_errors++; | |
1073 | stats->tx_dropped++; | |
1074 | kfree_skb(skb); | |
1075 | t->recursion--; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1080 | { | |
1081 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1082 | int ltype = ipv6_addr_type(&p->laddr); |
1083 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1084 | |
1085 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1086 | ||
09c6bbf0 VN |
1087 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1088 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1089 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1090 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1091 | if (ltype&IPV6_ADDR_UNICAST) |
1092 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1093 | if (rtype&IPV6_ADDR_UNICAST) | |
1094 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1095 | } |
1096 | } | |
1097 | ||
3144581c | 1098 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1099 | { |
1100 | struct net_device *dev = t->dev; | |
1101 | struct ip6_tnl_parm *p = &t->parms; | |
1102 | struct flowi *fl = &t->fl; | |
1103 | ||
1104 | memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
1105 | memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1106 | ||
1107 | /* Set up flowi template */ | |
1108 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1109 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1110 | fl->oif = p->link; | |
1111 | fl->fl6_flowlabel = 0; | |
1112 | ||
1113 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1114 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1115 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1116 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1117 | ||
1118 | ip6_tnl_set_cap(t); | |
1119 | ||
1120 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1121 | dev->flags |= IFF_POINTOPOINT; | |
1122 | else | |
1123 | dev->flags &= ~IFF_POINTOPOINT; | |
1124 | ||
1125 | dev->iflink = p->link; | |
1126 | ||
1127 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1128 | int strict = (ipv6_addr_type(&p->raddr) & |
1129 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1130 | ||
2f7f54b7 PE |
1131 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1132 | &p->raddr, &p->laddr, | |
305d4b3c | 1133 | p->link, strict); |
1da177e4 LT |
1134 | |
1135 | if (rt == NULL) | |
1136 | return; | |
1137 | ||
1138 | if (rt->rt6i_dev) { | |
1139 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1140 | sizeof (struct ipv6hdr); | |
1141 | ||
1142 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1143 | ||
1144 | if (dev->mtu < IPV6_MIN_MTU) | |
1145 | dev->mtu = IPV6_MIN_MTU; | |
1146 | } | |
1147 | dst_release(&rt->u.dst); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /** | |
3144581c | 1152 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1153 | * @t: tunnel to be changed |
1154 | * @p: tunnel configuration parameters | |
1155 | * @active: != 0 if tunnel is ready for use | |
1156 | * | |
1157 | * Description: | |
3144581c | 1158 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1159 | **/ |
1160 | ||
1161 | static int | |
3144581c | 1162 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1163 | { |
1164 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1165 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1166 | t->parms.flags = p->flags; | |
1167 | t->parms.hop_limit = p->hop_limit; | |
1168 | t->parms.encap_limit = p->encap_limit; | |
1169 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1170 | t->parms.link = p->link; |
502b0935 | 1171 | t->parms.proto = p->proto; |
0c088890 | 1172 | ip6_tnl_dst_reset(t); |
3144581c | 1173 | ip6_tnl_link_config(t); |
1da177e4 LT |
1174 | return 0; |
1175 | } | |
1176 | ||
1177 | /** | |
3144581c | 1178 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1179 | * @dev: virtual device associated with tunnel |
1180 | * @ifr: parameters passed from userspace | |
1181 | * @cmd: command to be performed | |
1182 | * | |
1183 | * Description: | |
3144581c | 1184 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1185 | * from userspace. |
1da177e4 LT |
1186 | * |
1187 | * The possible commands are the following: | |
1188 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1189 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1190 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1191 | * %SIOCDELTUNNEL: delete tunnel | |
1192 | * | |
1ab1457c | 1193 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1194 | * initialization, can be used for creating other tunnel devices. |
1195 | * | |
1196 | * Return: | |
1197 | * 0 on success, | |
1198 | * %-EFAULT if unable to copy data to or from userspace, | |
1199 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1200 | * %-EINVAL if passed tunnel parameters are invalid, | |
1201 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1202 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1203 | **/ | |
1204 | ||
1205 | static int | |
3144581c | 1206 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1207 | { |
1208 | int err = 0; | |
1da177e4 LT |
1209 | struct ip6_tnl_parm p; |
1210 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1211 | struct net *net = dev_net(dev); |
1212 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1213 | |
1214 | switch (cmd) { | |
1215 | case SIOCGETTUNNEL: | |
15820e12 | 1216 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1217 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1218 | err = -EFAULT; |
1219 | break; | |
1220 | } | |
2dd02c89 | 1221 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1222 | } |
1223 | if (t == NULL) | |
2941a486 | 1224 | t = netdev_priv(dev); |
1da177e4 LT |
1225 | memcpy(&p, &t->parms, sizeof (p)); |
1226 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1227 | err = -EFAULT; | |
1228 | } | |
1229 | break; | |
1230 | case SIOCADDTUNNEL: | |
1231 | case SIOCCHGTUNNEL: | |
1232 | err = -EPERM; | |
1da177e4 LT |
1233 | if (!capable(CAP_NET_ADMIN)) |
1234 | break; | |
567131a7 VN |
1235 | err = -EFAULT; |
1236 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1237 | break; |
567131a7 | 1238 | err = -EINVAL; |
502b0935 YK |
1239 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1240 | p.proto != 0) | |
1da177e4 | 1241 | break; |
2dd02c89 | 1242 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1243 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1244 | if (t != NULL) { |
1245 | if (t->dev != dev) { | |
1246 | err = -EEXIST; | |
1247 | break; | |
1248 | } | |
1249 | } else | |
1250 | t = netdev_priv(dev); | |
1251 | ||
2dd02c89 | 1252 | ip6_tnl_unlink(ip6n, t); |
3144581c | 1253 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1254 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1255 | netdev_state_change(dev); |
1256 | } | |
567131a7 | 1257 | if (t) { |
1da177e4 | 1258 | err = 0; |
567131a7 VN |
1259 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1260 | err = -EFAULT; | |
1261 | ||
1262 | } else | |
1263 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1264 | break; |
1265 | case SIOCDELTUNNEL: | |
1266 | err = -EPERM; | |
1267 | if (!capable(CAP_NET_ADMIN)) | |
1268 | break; | |
1269 | ||
15820e12 | 1270 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1271 | err = -EFAULT; |
1272 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1273 | break; |
567131a7 | 1274 | err = -ENOENT; |
2dd02c89 | 1275 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1276 | break; |
567131a7 | 1277 | err = -EPERM; |
15820e12 | 1278 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1279 | break; |
567131a7 | 1280 | dev = t->dev; |
1da177e4 | 1281 | } |
22f8cde5 SH |
1282 | err = 0; |
1283 | unregister_netdevice(dev); | |
1da177e4 LT |
1284 | break; |
1285 | default: | |
1286 | err = -EINVAL; | |
1287 | } | |
1288 | return err; | |
1289 | } | |
1290 | ||
1291 | /** | |
3144581c | 1292 | * ip6_tnl_get_stats - return the stats for tunnel device |
1da177e4 LT |
1293 | * @dev: virtual device associated with tunnel |
1294 | * | |
1295 | * Return: stats for device | |
1296 | **/ | |
1297 | ||
1298 | static struct net_device_stats * | |
3144581c | 1299 | ip6_tnl_get_stats(struct net_device *dev) |
1da177e4 | 1300 | { |
2941a486 | 1301 | return &(((struct ip6_tnl *)netdev_priv(dev))->stat); |
1da177e4 LT |
1302 | } |
1303 | ||
1304 | /** | |
3144581c | 1305 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1306 | * @dev: virtual device associated with tunnel |
1307 | * @new_mtu: the new mtu | |
1308 | * | |
1309 | * Return: | |
1310 | * 0 on success, | |
1311 | * %-EINVAL if mtu too small | |
1312 | **/ | |
1313 | ||
1314 | static int | |
3144581c | 1315 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1316 | { |
1317 | if (new_mtu < IPV6_MIN_MTU) { | |
1318 | return -EINVAL; | |
1319 | } | |
1320 | dev->mtu = new_mtu; | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | /** | |
3144581c | 1325 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1326 | * @dev: virtual device associated with tunnel |
1327 | * | |
1328 | * Description: | |
1329 | * Initialize function pointers and device parameters | |
1330 | **/ | |
1331 | ||
3144581c | 1332 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1333 | { |
3144581c | 1334 | dev->uninit = ip6_tnl_dev_uninit; |
1da177e4 | 1335 | dev->destructor = free_netdev; |
61ec2aec | 1336 | dev->hard_start_xmit = ip6_tnl_xmit; |
3144581c YK |
1337 | dev->get_stats = ip6_tnl_get_stats; |
1338 | dev->do_ioctl = ip6_tnl_ioctl; | |
1339 | dev->change_mtu = ip6_tnl_change_mtu; | |
1da177e4 LT |
1340 | |
1341 | dev->type = ARPHRD_TUNNEL6; | |
1342 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1343 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1344 | dev->flags |= IFF_NOARP; | |
1345 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1346 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | ||
1350 | /** | |
3144581c | 1351 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1352 | * @dev: virtual device associated with tunnel |
1353 | **/ | |
1354 | ||
1355 | static inline void | |
3144581c | 1356 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1357 | { |
2941a486 | 1358 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1359 | t->dev = dev; |
1360 | strcpy(t->parms.name, dev->name); | |
1361 | } | |
1362 | ||
1363 | /** | |
3144581c | 1364 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1365 | * @dev: virtual device associated with tunnel |
1366 | **/ | |
1367 | ||
1368 | static int | |
3144581c | 1369 | ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1370 | { |
2941a486 | 1371 | struct ip6_tnl *t = netdev_priv(dev); |
3144581c YK |
1372 | ip6_tnl_dev_init_gen(dev); |
1373 | ip6_tnl_link_config(t); | |
1da177e4 LT |
1374 | return 0; |
1375 | } | |
1376 | ||
1377 | /** | |
3144581c | 1378 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1379 | * @dev: fallback device |
1380 | * | |
1381 | * Return: 0 | |
1382 | **/ | |
1383 | ||
1ab1457c | 1384 | static int |
3144581c | 1385 | ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1386 | { |
2941a486 | 1387 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1388 | struct net *net = dev_net(dev); |
1389 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1390 | ||
3144581c | 1391 | ip6_tnl_dev_init_gen(dev); |
502b0935 | 1392 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1393 | dev_hold(dev); |
3e6c9fb5 | 1394 | ip6n->tnls_wc[0] = t; |
1da177e4 LT |
1395 | return 0; |
1396 | } | |
1397 | ||
c4d3efaf YK |
1398 | static struct xfrm6_tunnel ip4ip6_handler = { |
1399 | .handler = ip4ip6_rcv, | |
1400 | .err_handler = ip4ip6_err, | |
1401 | .priority = 1, | |
1402 | }; | |
1403 | ||
1da177e4 | 1404 | static struct xfrm6_tunnel ip6ip6_handler = { |
0303770d PM |
1405 | .handler = ip6ip6_rcv, |
1406 | .err_handler = ip6ip6_err, | |
d2acc347 | 1407 | .priority = 1, |
1da177e4 LT |
1408 | }; |
1409 | ||
3e6c9fb5 PE |
1410 | static void ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
1411 | { | |
1412 | int h; | |
1413 | struct ip6_tnl *t; | |
1414 | ||
1415 | for (h = 0; h < HASH_SIZE; h++) { | |
1416 | while ((t = ip6n->tnls_r_l[h]) != NULL) | |
1417 | unregister_netdevice(t->dev); | |
1418 | } | |
1419 | ||
1420 | t = ip6n->tnls_wc[0]; | |
1421 | unregister_netdevice(t->dev); | |
1422 | } | |
1423 | ||
13eeb8e9 PE |
1424 | static int ip6_tnl_init_net(struct net *net) |
1425 | { | |
1426 | int err; | |
1427 | struct ip6_tnl_net *ip6n; | |
1428 | ||
1429 | err = -ENOMEM; | |
3e6c9fb5 | 1430 | ip6n = kzalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL); |
13eeb8e9 PE |
1431 | if (ip6n == NULL) |
1432 | goto err_alloc; | |
1433 | ||
1434 | err = net_assign_generic(net, ip6_tnl_net_id, ip6n); | |
1435 | if (err < 0) | |
1436 | goto err_assign; | |
1437 | ||
3e6c9fb5 PE |
1438 | ip6n->tnls[0] = ip6n->tnls_wc; |
1439 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1440 | ||
15820e12 PE |
1441 | err = -ENOMEM; |
1442 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1443 | ip6_tnl_dev_setup); | |
1444 | ||
1445 | if (!ip6n->fb_tnl_dev) | |
1446 | goto err_alloc_dev; | |
1447 | ||
1448 | ip6n->fb_tnl_dev->init = ip6_fb_tnl_dev_init; | |
1449 | dev_net_set(ip6n->fb_tnl_dev, net); | |
1450 | ||
1451 | err = register_netdev(ip6n->fb_tnl_dev); | |
1452 | if (err < 0) | |
1453 | goto err_register; | |
13eeb8e9 PE |
1454 | return 0; |
1455 | ||
15820e12 PE |
1456 | err_register: |
1457 | free_netdev(ip6n->fb_tnl_dev); | |
1458 | err_alloc_dev: | |
1459 | /* nothing */ | |
13eeb8e9 PE |
1460 | err_assign: |
1461 | kfree(ip6n); | |
1462 | err_alloc: | |
1463 | return err; | |
1464 | } | |
1465 | ||
1466 | static void ip6_tnl_exit_net(struct net *net) | |
1467 | { | |
1468 | struct ip6_tnl_net *ip6n; | |
1469 | ||
1470 | ip6n = net_generic(net, ip6_tnl_net_id); | |
3e6c9fb5 PE |
1471 | rtnl_lock(); |
1472 | ip6_tnl_destroy_tunnels(ip6n); | |
1473 | rtnl_unlock(); | |
13eeb8e9 PE |
1474 | kfree(ip6n); |
1475 | } | |
1476 | ||
1477 | static struct pernet_operations ip6_tnl_net_ops = { | |
1478 | .init = ip6_tnl_init_net, | |
1479 | .exit = ip6_tnl_exit_net, | |
1480 | }; | |
1481 | ||
1da177e4 LT |
1482 | /** |
1483 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1484 | * | |
1485 | * Return: 0 on success | |
1486 | **/ | |
1487 | ||
1488 | static int __init ip6_tunnel_init(void) | |
1489 | { | |
1490 | int err; | |
1491 | ||
c4d3efaf | 1492 | if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { |
3144581c | 1493 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
c4d3efaf YK |
1494 | err = -EAGAIN; |
1495 | goto out; | |
1496 | } | |
1497 | ||
73d605d1 | 1498 | if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { |
3144581c | 1499 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
c4d3efaf YK |
1500 | err = -EAGAIN; |
1501 | goto unreg_ip4ip6; | |
1da177e4 | 1502 | } |
13eeb8e9 PE |
1503 | |
1504 | err = register_pernet_gen_device(&ip6_tnl_net_id, &ip6_tnl_net_ops); | |
1505 | if (err < 0) | |
1506 | goto err_pernet; | |
1da177e4 | 1507 | return 0; |
13eeb8e9 | 1508 | err_pernet: |
73d605d1 | 1509 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
c4d3efaf YK |
1510 | unreg_ip4ip6: |
1511 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); | |
1512 | out: | |
1da177e4 LT |
1513 | return err; |
1514 | } | |
1515 | ||
1516 | /** | |
1517 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1518 | **/ | |
1519 | ||
1520 | static void __exit ip6_tunnel_cleanup(void) | |
1521 | { | |
c4d3efaf | 1522 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1523 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1524 | |
73d605d1 | 1525 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1526 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1527 | |
13eeb8e9 | 1528 | unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops); |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | module_init(ip6_tunnel_init); | |
1532 | module_exit(ip6_tunnel_cleanup); |