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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 | 8 | * |
1da177e4 | 9 | * Based on: |
c4d3efaf | 10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
11 | * |
12 | * RFC 2473 | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
1da177e4 | 21 | #include <linux/module.h> |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/errno.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/sockios.h> | |
c4d3efaf | 26 | #include <linux/icmp.h> |
1da177e4 LT |
27 | #include <linux/if.h> |
28 | #include <linux/in.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/if_tunnel.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/in6.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <linux/icmpv6.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/rtnetlink.h> | |
39 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/atomic.h> | |
44 | ||
c4d3efaf | 45 | #include <net/icmp.h> |
1da177e4 LT |
46 | #include <net/ip.h> |
47 | #include <net/ipv6.h> | |
1da177e4 LT |
48 | #include <net/ip6_route.h> |
49 | #include <net/addrconf.h> | |
50 | #include <net/ip6_tunnel.h> | |
51 | #include <net/xfrm.h> | |
52 | #include <net/dsfield.h> | |
53 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
54 | #include <net/net_namespace.h> |
55 | #include <net/netns/generic.h> | |
1da177e4 LT |
56 | |
57 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 58 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 59 | MODULE_LICENSE("GPL"); |
6dfbd87a | 60 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 61 | |
1da177e4 | 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 | |
8560f226 | 77 | static int 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 | 84 | /* lists for storing tunnels in use */ |
94767632 ED |
85 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
86 | struct ip6_tnl __rcu *tnls_wc[1]; | |
87 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
88 | }; |
89 | ||
8560f226 ED |
90 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
91 | struct pcpu_tstats { | |
92 | unsigned long rx_packets; | |
93 | unsigned long rx_bytes; | |
94 | unsigned long tx_packets; | |
95 | unsigned long tx_bytes; | |
96 | }; | |
97 | ||
98 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
99 | { | |
100 | struct pcpu_tstats sum = { 0 }; | |
101 | int i; | |
102 | ||
103 | for_each_possible_cpu(i) { | |
104 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
105 | ||
106 | sum.rx_packets += tstats->rx_packets; | |
107 | sum.rx_bytes += tstats->rx_bytes; | |
108 | sum.tx_packets += tstats->tx_packets; | |
109 | sum.tx_bytes += tstats->tx_bytes; | |
110 | } | |
111 | dev->stats.rx_packets = sum.rx_packets; | |
112 | dev->stats.rx_bytes = sum.rx_bytes; | |
113 | dev->stats.tx_packets = sum.tx_packets; | |
114 | dev->stats.tx_bytes = sum.tx_bytes; | |
115 | return &dev->stats; | |
116 | } | |
117 | ||
2922bc8a | 118 | /* |
94767632 | 119 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 120 | */ |
1da177e4 LT |
121 | |
122 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
123 | { | |
124 | struct dst_entry *dst = t->dst_cache; | |
125 | ||
1ab1457c | 126 | if (dst && dst->obsolete && |
1da177e4 LT |
127 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
128 | t->dst_cache = NULL; | |
129 | dst_release(dst); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | return dst; | |
134 | } | |
135 | ||
136 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
137 | { | |
138 | dst_release(t->dst_cache); | |
139 | t->dst_cache = NULL; | |
140 | } | |
141 | ||
142 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
143 | { | |
144 | struct rt6_info *rt = (struct rt6_info *) dst; | |
145 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
146 | dst_release(t->dst_cache); | |
147 | t->dst_cache = dst; | |
148 | } | |
149 | ||
150 | /** | |
3144581c | 151 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
152 | * @remote: the address of the tunnel exit-point |
153 | * @local: the address of the tunnel entry-point | |
1da177e4 | 154 | * |
1ab1457c | 155 | * Return: |
1da177e4 | 156 | * tunnel matching given end-points if found, |
1ab1457c | 157 | * else fallback tunnel if its device is up, |
1da177e4 LT |
158 | * else %NULL |
159 | **/ | |
160 | ||
2922bc8a ED |
161 | #define for_each_ip6_tunnel_rcu(start) \ |
162 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
163 | ||
1da177e4 | 164 | static struct ip6_tnl * |
2dd02c89 | 165 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 | 166 | { |
94767632 ED |
167 | unsigned int h0 = HASH(remote); |
168 | unsigned int h1 = HASH(local); | |
1da177e4 | 169 | struct ip6_tnl *t; |
3e6c9fb5 | 170 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 171 | |
2922bc8a | 172 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
173 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
174 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
175 | (t->dev->flags & IFF_UP)) | |
176 | return t; | |
177 | } | |
2922bc8a ED |
178 | t = rcu_dereference(ip6n->tnls_wc[0]); |
179 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
180 | return t; |
181 | ||
182 | return NULL; | |
183 | } | |
184 | ||
185 | /** | |
3144581c | 186 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 187 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
188 | * |
189 | * Description: | |
3144581c | 190 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
191 | * &struct in6_addr entries laddr and raddr in @p. |
192 | * | |
1ab1457c | 193 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
194 | **/ |
195 | ||
94767632 | 196 | static struct ip6_tnl __rcu ** |
2dd02c89 | 197 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
198 | { |
199 | struct in6_addr *remote = &p->raddr; | |
200 | struct in6_addr *local = &p->laddr; | |
201 | unsigned h = 0; | |
202 | int prio = 0; | |
203 | ||
204 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
205 | prio = 1; | |
206 | h = HASH(remote) ^ HASH(local); | |
207 | } | |
3e6c9fb5 | 208 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
209 | } |
210 | ||
211 | /** | |
3144581c | 212 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
213 | * @t: tunnel to be added |
214 | **/ | |
215 | ||
216 | static void | |
2dd02c89 | 217 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 218 | { |
94767632 | 219 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 220 | |
94767632 | 221 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
2922bc8a | 222 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
223 | } |
224 | ||
225 | /** | |
3144581c | 226 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
227 | * @t: tunnel to be removed |
228 | **/ | |
229 | ||
230 | static void | |
2dd02c89 | 231 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 232 | { |
94767632 ED |
233 | struct ip6_tnl __rcu **tp; |
234 | struct ip6_tnl *iter; | |
235 | ||
236 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
237 | (iter = rtnl_dereference(*tp)) != NULL; | |
238 | tp = &iter->next) { | |
239 | if (t == iter) { | |
240 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
241 | break; |
242 | } | |
243 | } | |
244 | } | |
245 | ||
8560f226 ED |
246 | static void ip6_dev_free(struct net_device *dev) |
247 | { | |
248 | free_percpu(dev->tstats); | |
249 | free_netdev(dev); | |
250 | } | |
251 | ||
1da177e4 LT |
252 | /** |
253 | * ip6_tnl_create() - create a new tunnel | |
254 | * @p: tunnel parameters | |
255 | * @pt: pointer to new tunnel | |
256 | * | |
257 | * Description: | |
258 | * Create tunnel matching given parameters. | |
1ab1457c YH |
259 | * |
260 | * Return: | |
567131a7 | 261 | * created tunnel or NULL |
1da177e4 LT |
262 | **/ |
263 | ||
2dd02c89 | 264 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
265 | { |
266 | struct net_device *dev; | |
267 | struct ip6_tnl *t; | |
268 | char name[IFNAMSIZ]; | |
269 | int err; | |
2dd02c89 | 270 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 271 | |
34cc7ba6 | 272 | if (p->name[0]) |
1da177e4 | 273 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
274 | else |
275 | sprintf(name, "ip6tnl%%d"); | |
276 | ||
3144581c | 277 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 278 | if (dev == NULL) |
567131a7 | 279 | goto failed; |
1da177e4 | 280 | |
554eb277 PE |
281 | dev_net_set(dev, net); |
282 | ||
b37d428b PE |
283 | if (strchr(name, '%')) { |
284 | if (dev_alloc_name(dev, name) < 0) | |
285 | goto failed_free; | |
286 | } | |
287 | ||
2941a486 | 288 | t = netdev_priv(dev); |
1da177e4 | 289 | t->parms = *p; |
8560f226 ED |
290 | err = ip6_tnl_dev_init(dev); |
291 | if (err < 0) | |
292 | goto failed_free; | |
1da177e4 | 293 | |
b37d428b PE |
294 | if ((err = register_netdevice(dev)) < 0) |
295 | goto failed_free; | |
296 | ||
1da177e4 | 297 | dev_hold(dev); |
2dd02c89 | 298 | ip6_tnl_link(ip6n, t); |
567131a7 | 299 | return t; |
b37d428b PE |
300 | |
301 | failed_free: | |
8560f226 | 302 | ip6_dev_free(dev); |
567131a7 VN |
303 | failed: |
304 | return NULL; | |
1da177e4 LT |
305 | } |
306 | ||
307 | /** | |
3144581c | 308 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 309 | * @p: tunnel parameters |
1da177e4 LT |
310 | * @create: != 0 if allowed to create new tunnel if no match found |
311 | * | |
312 | * Description: | |
3144581c | 313 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
314 | * based on @parms. If this is unsuccessful, but @create is set a new |
315 | * tunnel device is created and registered for use. | |
316 | * | |
317 | * Return: | |
567131a7 | 318 | * matching tunnel or NULL |
1da177e4 LT |
319 | **/ |
320 | ||
2dd02c89 PE |
321 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
322 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
323 | { |
324 | struct in6_addr *remote = &p->raddr; | |
325 | struct in6_addr *local = &p->laddr; | |
94767632 | 326 | struct ip6_tnl __rcu **tp; |
1da177e4 | 327 | struct ip6_tnl *t; |
2dd02c89 | 328 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 329 | |
94767632 ED |
330 | for (tp = ip6_tnl_bucket(ip6n, p); |
331 | (t = rtnl_dereference(*tp)) != NULL; | |
332 | tp = &t->next) { | |
1da177e4 | 333 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
334 | ipv6_addr_equal(remote, &t->parms.raddr)) |
335 | return t; | |
1da177e4 LT |
336 | } |
337 | if (!create) | |
567131a7 | 338 | return NULL; |
2dd02c89 | 339 | return ip6_tnl_create(net, p); |
1da177e4 LT |
340 | } |
341 | ||
342 | /** | |
3144581c | 343 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 344 | * @dev: the device to be destroyed |
1ab1457c | 345 | * |
1da177e4 | 346 | * Description: |
3144581c | 347 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
348 | **/ |
349 | ||
350 | static void | |
3144581c | 351 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 352 | { |
2941a486 | 353 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
354 | struct net *net = dev_net(dev); |
355 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 356 | |
94767632 ED |
357 | if (dev == ip6n->fb_tnl_dev) |
358 | rcu_assign_pointer(ip6n->tnls_wc[0], NULL); | |
359 | else | |
2dd02c89 | 360 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
361 | ip6_tnl_dst_reset(t); |
362 | dev_put(dev); | |
363 | } | |
364 | ||
365 | /** | |
366 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
367 | * @skb: received socket buffer | |
368 | * | |
1ab1457c YH |
369 | * Return: |
370 | * 0 if none was found, | |
1da177e4 LT |
371 | * else index to encapsulation limit |
372 | **/ | |
373 | ||
374 | static __u16 | |
375 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
376 | { | |
377 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
378 | __u8 nexthdr = ipv6h->nexthdr; | |
379 | __u16 off = sizeof (*ipv6h); | |
380 | ||
381 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
382 | __u16 optlen = 0; | |
383 | struct ipv6_opt_hdr *hdr; | |
384 | if (raw + off + sizeof (*hdr) > skb->data && | |
385 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
386 | break; | |
387 | ||
388 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
389 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
390 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
391 | if (frag_hdr->frag_off) | |
392 | break; | |
393 | optlen = 8; | |
394 | } else if (nexthdr == NEXTHDR_AUTH) { | |
395 | optlen = (hdr->hdrlen + 2) << 2; | |
396 | } else { | |
397 | optlen = ipv6_optlen(hdr); | |
398 | } | |
399 | if (nexthdr == NEXTHDR_DEST) { | |
400 | __u16 i = off + 2; | |
401 | while (1) { | |
402 | struct ipv6_tlv_tnl_enc_lim *tel; | |
403 | ||
404 | /* No more room for encapsulation limit */ | |
405 | if (i + sizeof (*tel) > off + optlen) | |
406 | break; | |
407 | ||
408 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
409 | /* return index of option if found and valid */ | |
410 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
411 | tel->length == 1) | |
412 | return i; | |
413 | /* else jump to next option */ | |
414 | if (tel->type) | |
415 | i += tel->length + 2; | |
416 | else | |
417 | i++; | |
418 | } | |
419 | } | |
420 | nexthdr = hdr->nexthdr; | |
421 | off += optlen; | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | /** | |
e490d1d8 | 427 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
428 | * |
429 | * Description: | |
e490d1d8 | 430 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
431 | * to the specifications in RFC 2473. |
432 | **/ | |
433 | ||
d2acc347 | 434 | static int |
502b0935 | 435 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 436 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
437 | { |
438 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
439 | struct ip6_tnl *t; | |
440 | int rel_msg = 0; | |
d5fdd6ba BH |
441 | u8 rel_type = ICMPV6_DEST_UNREACH; |
442 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
443 | __u32 rel_info = 0; |
444 | __u16 len; | |
d2acc347 | 445 | int err = -ENOENT; |
1da177e4 | 446 | |
1ab1457c YH |
447 | /* If the packet doesn't contain the original IPv6 header we are |
448 | in trouble since we might need the source address for further | |
1da177e4 LT |
449 | processing of the error. */ |
450 | ||
2922bc8a | 451 | rcu_read_lock(); |
8704ca7e | 452 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 453 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
454 | goto out; |
455 | ||
502b0935 YK |
456 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
457 | goto out; | |
458 | ||
d2acc347 HX |
459 | err = 0; |
460 | ||
e490d1d8 | 461 | switch (*type) { |
1da177e4 LT |
462 | __u32 teli; |
463 | struct ipv6_tlv_tnl_enc_lim *tel; | |
464 | __u32 mtu; | |
465 | case ICMPV6_DEST_UNREACH: | |
466 | if (net_ratelimit()) | |
467 | printk(KERN_WARNING | |
468 | "%s: Path to destination invalid " | |
469 | "or inactive!\n", t->parms.name); | |
470 | rel_msg = 1; | |
471 | break; | |
472 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 473 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
474 | if (net_ratelimit()) |
475 | printk(KERN_WARNING | |
476 | "%s: Too small hop limit or " | |
1ab1457c | 477 | "routing loop in tunnel!\n", |
1da177e4 LT |
478 | t->parms.name); |
479 | rel_msg = 1; | |
480 | } | |
481 | break; | |
482 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 483 | teli = 0; |
e490d1d8 | 484 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 485 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 486 | |
704eae1f | 487 | if (teli && teli == *info - 2) { |
1da177e4 LT |
488 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
489 | if (tel->encap_limit == 0) { | |
490 | if (net_ratelimit()) | |
491 | printk(KERN_WARNING | |
492 | "%s: Too small encapsulation " | |
493 | "limit or routing loop in " | |
494 | "tunnel!\n", t->parms.name); | |
495 | rel_msg = 1; | |
496 | } | |
107a5fe6 VN |
497 | } else if (net_ratelimit()) { |
498 | printk(KERN_WARNING | |
499 | "%s: Recipient unable to parse tunneled " | |
500 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
501 | } |
502 | break; | |
503 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 504 | mtu = *info - offset; |
1da177e4 LT |
505 | if (mtu < IPV6_MIN_MTU) |
506 | mtu = IPV6_MIN_MTU; | |
507 | t->dev->mtu = mtu; | |
508 | ||
cc6cdac0 | 509 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
510 | rel_type = ICMPV6_PKT_TOOBIG; |
511 | rel_code = 0; | |
512 | rel_info = mtu; | |
513 | rel_msg = 1; | |
514 | } | |
515 | break; | |
516 | } | |
e490d1d8 YK |
517 | |
518 | *type = rel_type; | |
519 | *code = rel_code; | |
520 | *info = rel_info; | |
521 | *msg = rel_msg; | |
522 | ||
523 | out: | |
2922bc8a | 524 | rcu_read_unlock(); |
e490d1d8 YK |
525 | return err; |
526 | } | |
527 | ||
c4d3efaf YK |
528 | static int |
529 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 530 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
531 | { |
532 | int rel_msg = 0; | |
d5fdd6ba BH |
533 | u8 rel_type = type; |
534 | u8 rel_code = code; | |
704eae1f | 535 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
536 | int err; |
537 | struct sk_buff *skb2; | |
538 | struct iphdr *eiph; | |
c4d3efaf YK |
539 | struct rtable *rt; |
540 | ||
502b0935 YK |
541 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
542 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
543 | if (err < 0) |
544 | return err; | |
545 | ||
546 | if (rel_msg == 0) | |
547 | return 0; | |
548 | ||
549 | switch (rel_type) { | |
550 | case ICMPV6_DEST_UNREACH: | |
551 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
552 | return 0; | |
553 | rel_type = ICMP_DEST_UNREACH; | |
554 | rel_code = ICMP_HOST_UNREACH; | |
555 | break; | |
556 | case ICMPV6_PKT_TOOBIG: | |
557 | if (rel_code != 0) | |
558 | return 0; | |
559 | rel_type = ICMP_DEST_UNREACH; | |
560 | rel_code = ICMP_FRAG_NEEDED; | |
561 | break; | |
562 | default: | |
563 | return 0; | |
564 | } | |
565 | ||
566 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
567 | return 0; | |
568 | ||
569 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
570 | if (!skb2) | |
571 | return 0; | |
572 | ||
adf30907 ED |
573 | skb_dst_drop(skb2); |
574 | ||
c4d3efaf | 575 | skb_pull(skb2, offset); |
c1d2bbe1 | 576 | skb_reset_network_header(skb2); |
eddc9ec5 | 577 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
578 | |
579 | /* Try to guess incoming interface */ | |
78fbfd8a DM |
580 | rt = ip_route_output_ports(dev_net(skb->dev), NULL, |
581 | eiph->saddr, 0, | |
582 | 0, 0, | |
583 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 584 | if (IS_ERR(rt)) |
c4d3efaf YK |
585 | goto out; |
586 | ||
d8d1f30b | 587 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
588 | |
589 | /* route "incoming" packet */ | |
590 | if (rt->rt_flags & RTCF_LOCAL) { | |
591 | ip_rt_put(rt); | |
592 | rt = NULL; | |
78fbfd8a DM |
593 | rt = ip_route_output_ports(dev_net(skb->dev), NULL, |
594 | eiph->daddr, eiph->saddr, | |
595 | 0, 0, | |
596 | IPPROTO_IPIP, | |
597 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 598 | if (IS_ERR(rt) || |
d8d1f30b | 599 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
600 | if (!IS_ERR(rt)) |
601 | ip_rt_put(rt); | |
c4d3efaf YK |
602 | goto out; |
603 | } | |
b23dd4fe | 604 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
605 | } else { |
606 | ip_rt_put(rt); | |
607 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
608 | skb2->dev) || | |
adf30907 | 609 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
610 | goto out; |
611 | } | |
612 | ||
613 | /* change mtu on this route */ | |
614 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 615 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
616 | goto out; |
617 | ||
adf30907 | 618 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
619 | } |
620 | ||
704eae1f | 621 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
622 | |
623 | out: | |
624 | kfree_skb(skb2); | |
625 | return 0; | |
626 | } | |
627 | ||
e490d1d8 YK |
628 | static int |
629 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 630 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
631 | { |
632 | int rel_msg = 0; | |
d5fdd6ba BH |
633 | u8 rel_type = type; |
634 | u8 rel_code = code; | |
704eae1f | 635 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
636 | int err; |
637 | ||
502b0935 YK |
638 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
639 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
640 | if (err < 0) |
641 | return err; | |
642 | ||
643 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
644 | struct rt6_info *rt; |
645 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 646 | |
1da177e4 | 647 | if (!skb2) |
e490d1d8 | 648 | return 0; |
1da177e4 | 649 | |
adf30907 | 650 | skb_dst_drop(skb2); |
1da177e4 | 651 | skb_pull(skb2, offset); |
c1d2bbe1 | 652 | skb_reset_network_header(skb2); |
1da177e4 LT |
653 | |
654 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
655 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
656 | NULL, 0, 0); | |
1da177e4 LT |
657 | |
658 | if (rt && rt->rt6i_dev) | |
659 | skb2->dev = rt->rt6i_dev; | |
660 | ||
3ffe533c | 661 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
662 | |
663 | if (rt) | |
d8d1f30b | 664 | dst_release(&rt->dst); |
1da177e4 LT |
665 | |
666 | kfree_skb(skb2); | |
667 | } | |
e490d1d8 YK |
668 | |
669 | return 0; | |
1da177e4 LT |
670 | } |
671 | ||
c4d3efaf YK |
672 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
673 | struct ipv6hdr *ipv6h, | |
674 | struct sk_buff *skb) | |
675 | { | |
676 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
677 | ||
678 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 679 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
680 | |
681 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 682 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
683 | } |
684 | ||
8359925b YK |
685 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
686 | struct ipv6hdr *ipv6h, | |
687 | struct sk_buff *skb) | |
1da177e4 | 688 | { |
8359925b | 689 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 690 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 691 | |
8359925b | 692 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 693 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 694 | } |
8359925b | 695 | |
f1a28eab | 696 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
697 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
698 | { | |
699 | struct ip6_tnl_parm *p = &t->parms; | |
700 | int ret = 0; | |
2f7f54b7 | 701 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
702 | |
703 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 704 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
705 | |
706 | if (p->link) | |
f1a28eab | 707 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
708 | |
709 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
710 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
711 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
712 | ret = 1; |
713 | ||
09c6bbf0 VN |
714 | } |
715 | return ret; | |
716 | } | |
1da177e4 LT |
717 | |
718 | /** | |
3144581c | 719 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 720 | * @skb: received socket buffer |
8359925b YK |
721 | * @protocol: ethernet protocol ID |
722 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
723 | * |
724 | * Return: 0 | |
725 | **/ | |
726 | ||
8359925b | 727 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 728 | __u8 ipproto, |
8359925b YK |
729 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
730 | struct ipv6hdr *ipv6h, | |
731 | struct sk_buff *skb)) | |
1da177e4 | 732 | { |
1da177e4 | 733 | struct ip6_tnl *t; |
0660e03f | 734 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 735 | |
2922bc8a | 736 | rcu_read_lock(); |
1da177e4 | 737 | |
8704ca7e | 738 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 739 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
740 | struct pcpu_tstats *tstats; |
741 | ||
502b0935 | 742 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 743 | rcu_read_unlock(); |
502b0935 YK |
744 | goto discard; |
745 | } | |
746 | ||
1da177e4 | 747 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 748 | rcu_read_unlock(); |
50fba2aa | 749 | goto discard; |
1da177e4 LT |
750 | } |
751 | ||
09c6bbf0 | 752 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 753 | t->dev->stats.rx_dropped++; |
2922bc8a | 754 | rcu_read_unlock(); |
1da177e4 LT |
755 | goto discard; |
756 | } | |
757 | secpath_reset(skb); | |
b0e380b1 | 758 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 759 | skb_reset_network_header(skb); |
8359925b | 760 | skb->protocol = htons(protocol); |
1da177e4 LT |
761 | skb->pkt_type = PACKET_HOST; |
762 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 763 | |
8560f226 ED |
764 | tstats = this_cpu_ptr(t->dev->tstats); |
765 | tstats->rx_packets++; | |
766 | tstats->rx_bytes += skb->len; | |
767 | ||
768 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 769 | |
d19d56dd | 770 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 771 | |
caf586e5 | 772 | netif_rx(skb); |
8990f468 | 773 | |
2922bc8a | 774 | rcu_read_unlock(); |
1da177e4 LT |
775 | return 0; |
776 | } | |
2922bc8a | 777 | rcu_read_unlock(); |
1da177e4 | 778 | return 1; |
50fba2aa HX |
779 | |
780 | discard: | |
781 | kfree_skb(skb); | |
782 | return 0; | |
1da177e4 LT |
783 | } |
784 | ||
c4d3efaf YK |
785 | static int ip4ip6_rcv(struct sk_buff *skb) |
786 | { | |
502b0935 YK |
787 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
788 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
789 | } |
790 | ||
8359925b YK |
791 | static int ip6ip6_rcv(struct sk_buff *skb) |
792 | { | |
502b0935 YK |
793 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
794 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
795 | } |
796 | ||
6fb32dde VN |
797 | struct ipv6_tel_txoption { |
798 | struct ipv6_txoptions ops; | |
799 | __u8 dst_opt[8]; | |
800 | }; | |
1da177e4 | 801 | |
6fb32dde VN |
802 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
803 | { | |
804 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 805 | |
6fb32dde VN |
806 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
807 | opt->dst_opt[3] = 1; | |
808 | opt->dst_opt[4] = encap_limit; | |
809 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
810 | opt->dst_opt[6] = 1; | |
1da177e4 | 811 | |
6fb32dde VN |
812 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
813 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
814 | } |
815 | ||
816 | /** | |
3144581c | 817 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 818 | * @t: the outgoing tunnel device |
1ab1457c | 819 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
820 | * |
821 | * Description: | |
1ab1457c | 822 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
823 | * doesn't match source of incoming packet. |
824 | * | |
1ab1457c | 825 | * Return: |
1da177e4 LT |
826 | * 1 if conflict, |
827 | * 0 else | |
828 | **/ | |
829 | ||
830 | static inline int | |
3144581c | 831 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
832 | { |
833 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
834 | } | |
835 | ||
09c6bbf0 VN |
836 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
837 | { | |
838 | struct ip6_tnl_parm *p = &t->parms; | |
839 | int ret = 0; | |
2f7f54b7 | 840 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 841 | |
1ab1457c | 842 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
843 | struct net_device *ldev = NULL; |
844 | ||
f1a28eab | 845 | rcu_read_lock(); |
09c6bbf0 | 846 | if (p->link) |
f1a28eab | 847 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 848 | |
2f7f54b7 | 849 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
850 | printk(KERN_WARNING |
851 | "%s xmit: Local address not yet configured!\n", | |
852 | p->name); | |
853 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 854 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
855 | printk(KERN_WARNING |
856 | "%s xmit: Routing loop! " | |
857 | "Remote address found on this node!\n", | |
858 | p->name); | |
859 | else | |
860 | ret = 1; | |
f1a28eab | 861 | rcu_read_unlock(); |
09c6bbf0 VN |
862 | } |
863 | return ret; | |
864 | } | |
1da177e4 | 865 | /** |
61ec2aec | 866 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 867 | * @skb: the outgoing socket buffer |
1ab1457c | 868 | * @dev: the outgoing tunnel device |
61ec2aec YK |
869 | * @dsfield: dscp code for outer header |
870 | * @fl: flow of tunneled packet | |
871 | * @encap_limit: encapsulation limit | |
872 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
873 | * |
874 | * Description: | |
875 | * Build new header and do some sanity checks on the packet before sending | |
876 | * it. | |
877 | * | |
1ab1457c | 878 | * Return: |
c4d3efaf | 879 | * 0 on success |
61ec2aec YK |
880 | * -1 fail |
881 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
882 | **/ |
883 | ||
61ec2aec YK |
884 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
885 | struct net_device *dev, | |
886 | __u8 dsfield, | |
887 | struct flowi *fl, | |
888 | int encap_limit, | |
889 | __u32 *pmtu) | |
1da177e4 | 890 | { |
52479b62 | 891 | struct net *net = dev_net(dev); |
2941a486 | 892 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 893 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 894 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 895 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
896 | struct dst_entry *dst; |
897 | struct net_device *tdev; | |
898 | int mtu; | |
c2636b4d | 899 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 900 | u8 proto; |
61ec2aec | 901 | int err = -1; |
1da177e4 | 902 | int pkt_len; |
1da177e4 | 903 | |
1da177e4 LT |
904 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
905 | dst_hold(dst); | |
a57ebc90 | 906 | else { |
52479b62 | 907 | dst = ip6_route_output(net, NULL, fl); |
1da177e4 | 908 | |
452edd59 | 909 | if (dst->error) |
a57ebc90 | 910 | goto tx_err_link_failure; |
452edd59 DM |
911 | dst = xfrm_lookup(net, dst, fl, NULL, 0); |
912 | if (IS_ERR(dst)) { | |
913 | err = PTR_ERR(dst); | |
914 | dst = NULL; | |
915 | goto tx_err_link_failure; | |
916 | } | |
a57ebc90 | 917 | } |
1da177e4 LT |
918 | |
919 | tdev = dst->dev; | |
920 | ||
921 | if (tdev == dev) { | |
922 | stats->collisions++; | |
923 | if (net_ratelimit()) | |
1ab1457c | 924 | printk(KERN_WARNING |
1da177e4 LT |
925 | "%s: Local routing loop detected!\n", |
926 | t->parms.name); | |
927 | goto tx_err_dst_release; | |
928 | } | |
929 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 930 | if (encap_limit >= 0) { |
1da177e4 LT |
931 | max_headroom += 8; |
932 | mtu -= 8; | |
933 | } | |
934 | if (mtu < IPV6_MIN_MTU) | |
935 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
936 | if (skb_dst(skb)) |
937 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 938 | if (skb->len > mtu) { |
61ec2aec YK |
939 | *pmtu = mtu; |
940 | err = -EMSGSIZE; | |
1da177e4 LT |
941 | goto tx_err_dst_release; |
942 | } | |
943 | ||
944 | /* | |
945 | * Okay, now see if we can stuff it in the buffer as-is. | |
946 | */ | |
947 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 948 | |
cfbba49d PM |
949 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
950 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 951 | struct sk_buff *new_skb; |
1ab1457c | 952 | |
1da177e4 LT |
953 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
954 | goto tx_err_dst_release; | |
955 | ||
956 | if (skb->sk) | |
957 | skb_set_owner_w(new_skb, skb->sk); | |
958 | kfree_skb(skb); | |
959 | skb = new_skb; | |
960 | } | |
adf30907 ED |
961 | skb_dst_drop(skb); |
962 | skb_dst_set(skb, dst_clone(dst)); | |
1da177e4 | 963 | |
b0e380b1 | 964 | skb->transport_header = skb->network_header; |
1da177e4 | 965 | |
1d28f42c | 966 | proto = fl->flowi_proto; |
6fb32dde VN |
967 | if (encap_limit >= 0) { |
968 | init_tel_txopt(&opt, encap_limit); | |
969 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
970 | } | |
e2d1bca7 ACM |
971 | skb_push(skb, sizeof(struct ipv6hdr)); |
972 | skb_reset_network_header(skb); | |
0660e03f | 973 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 974 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
975 | dsfield = INET_ECN_encapsulate(0, dsfield); |
976 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
977 | ipv6h->hop_limit = t->parms.hop_limit; |
978 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
979 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
980 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
981 | nf_reset(skb); |
982 | pkt_len = skb->len; | |
ef76bc23 | 983 | err = ip6_local_out(skb); |
1da177e4 | 984 | |
b9df3cb8 | 985 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
986 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
987 | ||
988 | tstats->tx_bytes += pkt_len; | |
989 | tstats->tx_packets++; | |
1da177e4 LT |
990 | } else { |
991 | stats->tx_errors++; | |
992 | stats->tx_aborted_errors++; | |
993 | } | |
994 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
995 | return 0; |
996 | tx_err_link_failure: | |
997 | stats->tx_carrier_errors++; | |
998 | dst_link_failure(skb); | |
999 | tx_err_dst_release: | |
1000 | dst_release(dst); | |
61ec2aec YK |
1001 | return err; |
1002 | } | |
1003 | ||
c4d3efaf YK |
1004 | static inline int |
1005 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1006 | { | |
1007 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 1008 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
1009 | int encap_limit = -1; |
1010 | struct flowi fl; | |
1011 | __u8 dsfield; | |
1012 | __u32 mtu; | |
1013 | int err; | |
1014 | ||
502b0935 YK |
1015 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1016 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1017 | return -1; |
1018 | ||
1019 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1020 | encap_limit = t->parms.encap_limit; | |
1021 | ||
1022 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1d28f42c | 1023 | fl.flowi_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1024 | |
1025 | dsfield = ipv4_get_dsfield(iph); | |
1026 | ||
1027 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
1028 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
1029 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
1030 | |
1031 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1032 | if (err != 0) { | |
1033 | /* XXX: send ICMP error even if DF is not set. */ | |
1034 | if (err == -EMSGSIZE) | |
1035 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1036 | htonl(mtu)); | |
1037 | return -1; | |
1038 | } | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
61ec2aec YK |
1043 | static inline int |
1044 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1045 | { | |
1046 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1047 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1048 | int encap_limit = -1; |
1049 | __u16 offset; | |
1050 | struct flowi fl; | |
1051 | __u8 dsfield; | |
1052 | __u32 mtu; | |
1053 | int err; | |
1054 | ||
502b0935 YK |
1055 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1056 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1057 | return -1; |
1058 | ||
d56f90a7 ACM |
1059 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1060 | if (offset > 0) { | |
61ec2aec | 1061 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1062 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1063 | if (tel->encap_limit == 0) { |
1064 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1065 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1066 | return -1; |
1067 | } | |
1068 | encap_limit = tel->encap_limit - 1; | |
1069 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1070 | encap_limit = t->parms.encap_limit; | |
1071 | ||
1072 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1d28f42c | 1073 | fl.flowi_proto = IPPROTO_IPV6; |
61ec2aec YK |
1074 | |
1075 | dsfield = ipv6_get_dsfield(ipv6h); | |
1076 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1077 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1078 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1079 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1080 | ||
1081 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1082 | if (err != 0) { | |
1083 | if (err == -EMSGSIZE) | |
3ffe533c | 1084 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1085 | return -1; |
1086 | } | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
6fef4c0c | 1091 | static netdev_tx_t |
61ec2aec YK |
1092 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1093 | { | |
1094 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1095 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1096 | int ret; |
1097 | ||
61ec2aec | 1098 | switch (skb->protocol) { |
60678040 | 1099 | case htons(ETH_P_IP): |
c4d3efaf YK |
1100 | ret = ip4ip6_tnl_xmit(skb, dev); |
1101 | break; | |
60678040 | 1102 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1103 | ret = ip6ip6_tnl_xmit(skb, dev); |
1104 | break; | |
1105 | default: | |
1106 | goto tx_err; | |
1107 | } | |
1108 | ||
1109 | if (ret < 0) | |
1110 | goto tx_err; | |
1111 | ||
6ed10654 | 1112 | return NETDEV_TX_OK; |
61ec2aec | 1113 | |
1da177e4 LT |
1114 | tx_err: |
1115 | stats->tx_errors++; | |
1116 | stats->tx_dropped++; | |
1117 | kfree_skb(skb); | |
6ed10654 | 1118 | return NETDEV_TX_OK; |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1122 | { | |
1123 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1124 | int ltype = ipv6_addr_type(&p->laddr); |
1125 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1126 | |
1127 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1128 | ||
09c6bbf0 VN |
1129 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1130 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1131 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1132 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1133 | if (ltype&IPV6_ADDR_UNICAST) |
1134 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1135 | if (rtype&IPV6_ADDR_UNICAST) | |
1136 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1137 | } |
1138 | } | |
1139 | ||
3144581c | 1140 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1141 | { |
1142 | struct net_device *dev = t->dev; | |
1143 | struct ip6_tnl_parm *p = &t->parms; | |
1144 | struct flowi *fl = &t->fl; | |
1145 | ||
3a6d54c5 JP |
1146 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1147 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1148 | |
1149 | /* Set up flowi template */ | |
1150 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1151 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1d28f42c | 1152 | fl->flowi_oif = p->link; |
1da177e4 LT |
1153 | fl->fl6_flowlabel = 0; |
1154 | ||
1155 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1156 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1157 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1158 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1159 | ||
1160 | ip6_tnl_set_cap(t); | |
1161 | ||
1162 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1163 | dev->flags |= IFF_POINTOPOINT; | |
1164 | else | |
1165 | dev->flags &= ~IFF_POINTOPOINT; | |
1166 | ||
1167 | dev->iflink = p->link; | |
1168 | ||
1169 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1170 | int strict = (ipv6_addr_type(&p->raddr) & |
1171 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1172 | ||
2f7f54b7 PE |
1173 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1174 | &p->raddr, &p->laddr, | |
305d4b3c | 1175 | p->link, strict); |
1da177e4 LT |
1176 | |
1177 | if (rt == NULL) | |
1178 | return; | |
1179 | ||
1180 | if (rt->rt6i_dev) { | |
1181 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1182 | sizeof (struct ipv6hdr); | |
1183 | ||
1184 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
381601e5 AF |
1185 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1186 | dev->mtu-=8; | |
1da177e4 LT |
1187 | |
1188 | if (dev->mtu < IPV6_MIN_MTU) | |
1189 | dev->mtu = IPV6_MIN_MTU; | |
1190 | } | |
d8d1f30b | 1191 | dst_release(&rt->dst); |
1da177e4 LT |
1192 | } |
1193 | } | |
1194 | ||
1195 | /** | |
3144581c | 1196 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1197 | * @t: tunnel to be changed |
1198 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1199 | * |
1200 | * Description: | |
3144581c | 1201 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1202 | **/ |
1203 | ||
1204 | static int | |
3144581c | 1205 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1206 | { |
1207 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1208 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1209 | t->parms.flags = p->flags; | |
1210 | t->parms.hop_limit = p->hop_limit; | |
1211 | t->parms.encap_limit = p->encap_limit; | |
1212 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1213 | t->parms.link = p->link; |
502b0935 | 1214 | t->parms.proto = p->proto; |
0c088890 | 1215 | ip6_tnl_dst_reset(t); |
3144581c | 1216 | ip6_tnl_link_config(t); |
1da177e4 LT |
1217 | return 0; |
1218 | } | |
1219 | ||
1220 | /** | |
3144581c | 1221 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1222 | * @dev: virtual device associated with tunnel |
1223 | * @ifr: parameters passed from userspace | |
1224 | * @cmd: command to be performed | |
1225 | * | |
1226 | * Description: | |
3144581c | 1227 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1228 | * from userspace. |
1da177e4 LT |
1229 | * |
1230 | * The possible commands are the following: | |
1231 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1232 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1233 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1234 | * %SIOCDELTUNNEL: delete tunnel | |
1235 | * | |
1ab1457c | 1236 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1237 | * initialization, can be used for creating other tunnel devices. |
1238 | * | |
1239 | * Return: | |
1240 | * 0 on success, | |
1241 | * %-EFAULT if unable to copy data to or from userspace, | |
1242 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1243 | * %-EINVAL if passed tunnel parameters are invalid, | |
1244 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1245 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1246 | **/ | |
1247 | ||
1248 | static int | |
3144581c | 1249 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1250 | { |
1251 | int err = 0; | |
1da177e4 LT |
1252 | struct ip6_tnl_parm p; |
1253 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1254 | struct net *net = dev_net(dev); |
1255 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1256 | |
1257 | switch (cmd) { | |
1258 | case SIOCGETTUNNEL: | |
15820e12 | 1259 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1260 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1261 | err = -EFAULT; |
1262 | break; | |
1263 | } | |
2dd02c89 | 1264 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1265 | } |
1266 | if (t == NULL) | |
2941a486 | 1267 | t = netdev_priv(dev); |
1da177e4 LT |
1268 | memcpy(&p, &t->parms, sizeof (p)); |
1269 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1270 | err = -EFAULT; | |
1271 | } | |
1272 | break; | |
1273 | case SIOCADDTUNNEL: | |
1274 | case SIOCCHGTUNNEL: | |
1275 | err = -EPERM; | |
1da177e4 LT |
1276 | if (!capable(CAP_NET_ADMIN)) |
1277 | break; | |
567131a7 VN |
1278 | err = -EFAULT; |
1279 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1280 | break; |
567131a7 | 1281 | err = -EINVAL; |
502b0935 YK |
1282 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1283 | p.proto != 0) | |
1da177e4 | 1284 | break; |
2dd02c89 | 1285 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1286 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1287 | if (t != NULL) { |
1288 | if (t->dev != dev) { | |
1289 | err = -EEXIST; | |
1290 | break; | |
1291 | } | |
1292 | } else | |
1293 | t = netdev_priv(dev); | |
1294 | ||
2dd02c89 | 1295 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1296 | synchronize_net(); |
3144581c | 1297 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1298 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1299 | netdev_state_change(dev); |
1300 | } | |
567131a7 | 1301 | if (t) { |
1da177e4 | 1302 | err = 0; |
567131a7 VN |
1303 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1304 | err = -EFAULT; | |
1305 | ||
1306 | } else | |
1307 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1308 | break; |
1309 | case SIOCDELTUNNEL: | |
1310 | err = -EPERM; | |
1311 | if (!capable(CAP_NET_ADMIN)) | |
1312 | break; | |
1313 | ||
15820e12 | 1314 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1315 | err = -EFAULT; |
1316 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1317 | break; |
567131a7 | 1318 | err = -ENOENT; |
2dd02c89 | 1319 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1320 | break; |
567131a7 | 1321 | err = -EPERM; |
15820e12 | 1322 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1323 | break; |
567131a7 | 1324 | dev = t->dev; |
1da177e4 | 1325 | } |
22f8cde5 SH |
1326 | err = 0; |
1327 | unregister_netdevice(dev); | |
1da177e4 LT |
1328 | break; |
1329 | default: | |
1330 | err = -EINVAL; | |
1331 | } | |
1332 | return err; | |
1333 | } | |
1334 | ||
1da177e4 | 1335 | /** |
3144581c | 1336 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1337 | * @dev: virtual device associated with tunnel |
1338 | * @new_mtu: the new mtu | |
1339 | * | |
1340 | * Return: | |
1341 | * 0 on success, | |
1342 | * %-EINVAL if mtu too small | |
1343 | **/ | |
1344 | ||
1345 | static int | |
3144581c | 1346 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1347 | { |
1348 | if (new_mtu < IPV6_MIN_MTU) { | |
1349 | return -EINVAL; | |
1350 | } | |
1351 | dev->mtu = new_mtu; | |
1352 | return 0; | |
1353 | } | |
1354 | ||
1326c3d5 SH |
1355 | |
1356 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1357 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1358 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1359 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1360 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1361 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1362 | }; |
1363 | ||
8560f226 | 1364 | |
1da177e4 | 1365 | /** |
3144581c | 1366 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1367 | * @dev: virtual device associated with tunnel |
1368 | * | |
1369 | * Description: | |
1370 | * Initialize function pointers and device parameters | |
1371 | **/ | |
1372 | ||
3144581c | 1373 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1374 | { |
381601e5 AF |
1375 | struct ip6_tnl *t; |
1376 | ||
1326c3d5 | 1377 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1378 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1379 | |
1380 | dev->type = ARPHRD_TUNNEL6; | |
1381 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1382 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1383 | t = netdev_priv(dev); |
1384 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1385 | dev->mtu-=8; | |
1da177e4 LT |
1386 | dev->flags |= IFF_NOARP; |
1387 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1388 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1389 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1390 | } |
1391 | ||
1392 | ||
1393 | /** | |
3144581c | 1394 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1395 | * @dev: virtual device associated with tunnel |
1396 | **/ | |
1397 | ||
8560f226 | 1398 | static inline int |
3144581c | 1399 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1400 | { |
2941a486 | 1401 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1402 | |
1da177e4 LT |
1403 | t->dev = dev; |
1404 | strcpy(t->parms.name, dev->name); | |
8560f226 ED |
1405 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1406 | if (!dev->tstats) | |
1407 | return -ENOMEM; | |
1408 | return 0; | |
1da177e4 LT |
1409 | } |
1410 | ||
1411 | /** | |
3144581c | 1412 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1413 | * @dev: virtual device associated with tunnel |
1414 | **/ | |
1415 | ||
8560f226 | 1416 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1417 | { |
2941a486 | 1418 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1419 | int err = ip6_tnl_dev_init_gen(dev); |
1420 | ||
1421 | if (err) | |
1422 | return err; | |
3144581c | 1423 | ip6_tnl_link_config(t); |
8560f226 | 1424 | return 0; |
1da177e4 LT |
1425 | } |
1426 | ||
1427 | /** | |
3144581c | 1428 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1429 | * @dev: fallback device |
1430 | * | |
1431 | * Return: 0 | |
1432 | **/ | |
1433 | ||
8560f226 | 1434 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1435 | { |
2941a486 | 1436 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1437 | struct net *net = dev_net(dev); |
1438 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1439 | int err = ip6_tnl_dev_init_gen(dev); |
1440 | ||
1441 | if (err) | |
1442 | return err; | |
3e6c9fb5 | 1443 | |
502b0935 | 1444 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1445 | dev_hold(dev); |
94767632 | 1446 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1447 | return 0; |
1da177e4 LT |
1448 | } |
1449 | ||
3ff2cfa5 | 1450 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1451 | .handler = ip4ip6_rcv, |
1452 | .err_handler = ip4ip6_err, | |
1453 | .priority = 1, | |
1454 | }; | |
1455 | ||
3ff2cfa5 | 1456 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1457 | .handler = ip6ip6_rcv, |
1458 | .err_handler = ip6ip6_err, | |
d2acc347 | 1459 | .priority = 1, |
1da177e4 LT |
1460 | }; |
1461 | ||
2c8c1e72 | 1462 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1463 | { |
1464 | int h; | |
1465 | struct ip6_tnl *t; | |
cf4432f5 | 1466 | LIST_HEAD(list); |
3e6c9fb5 PE |
1467 | |
1468 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1469 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1470 | while (t != NULL) { |
1471 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1472 | t = rtnl_dereference(t->next); |
cf4432f5 | 1473 | } |
3e6c9fb5 PE |
1474 | } |
1475 | ||
94767632 | 1476 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1477 | unregister_netdevice_queue(t->dev, &list); |
1478 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1479 | } |
1480 | ||
2c8c1e72 | 1481 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1482 | { |
ac31cd3c | 1483 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1484 | int err; |
13eeb8e9 | 1485 | |
3e6c9fb5 PE |
1486 | ip6n->tnls[0] = ip6n->tnls_wc; |
1487 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1488 | ||
15820e12 PE |
1489 | err = -ENOMEM; |
1490 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1491 | ip6_tnl_dev_setup); | |
1492 | ||
1493 | if (!ip6n->fb_tnl_dev) | |
1494 | goto err_alloc_dev; | |
be77e593 | 1495 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1496 | |
8560f226 ED |
1497 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1498 | if (err < 0) | |
1499 | goto err_register; | |
15820e12 PE |
1500 | |
1501 | err = register_netdev(ip6n->fb_tnl_dev); | |
1502 | if (err < 0) | |
1503 | goto err_register; | |
13eeb8e9 PE |
1504 | return 0; |
1505 | ||
15820e12 | 1506 | err_register: |
8560f226 | 1507 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1508 | err_alloc_dev: |
13eeb8e9 PE |
1509 | return err; |
1510 | } | |
1511 | ||
2c8c1e72 | 1512 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1513 | { |
ac31cd3c | 1514 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1515 | |
3e6c9fb5 PE |
1516 | rtnl_lock(); |
1517 | ip6_tnl_destroy_tunnels(ip6n); | |
1518 | rtnl_unlock(); | |
13eeb8e9 PE |
1519 | } |
1520 | ||
1521 | static struct pernet_operations ip6_tnl_net_ops = { | |
1522 | .init = ip6_tnl_init_net, | |
1523 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1524 | .id = &ip6_tnl_net_id, |
1525 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1526 | }; |
1527 | ||
1da177e4 LT |
1528 | /** |
1529 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1530 | * | |
1531 | * Return: 0 on success | |
1532 | **/ | |
1533 | ||
1534 | static int __init ip6_tunnel_init(void) | |
1535 | { | |
1536 | int err; | |
1537 | ||
d5aa407f AD |
1538 | err = register_pernet_device(&ip6_tnl_net_ops); |
1539 | if (err < 0) | |
1540 | goto out_pernet; | |
1541 | ||
1542 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1543 | if (err < 0) { | |
3144581c | 1544 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1545 | goto out_ip4ip6; |
c4d3efaf YK |
1546 | } |
1547 | ||
d5aa407f AD |
1548 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1549 | if (err < 0) { | |
3144581c | 1550 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1551 | goto out_ip6ip6; |
1da177e4 | 1552 | } |
13eeb8e9 | 1553 | |
1da177e4 | 1554 | return 0; |
d5aa407f AD |
1555 | |
1556 | out_ip6ip6: | |
c4d3efaf | 1557 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1558 | out_ip4ip6: |
1559 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1560 | out_pernet: | |
1da177e4 LT |
1561 | return err; |
1562 | } | |
1563 | ||
1564 | /** | |
1565 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1566 | **/ | |
1567 | ||
1568 | static void __exit ip6_tunnel_cleanup(void) | |
1569 | { | |
c4d3efaf | 1570 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1571 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1572 | |
73d605d1 | 1573 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1574 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1575 | |
ac31cd3c | 1576 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | module_init(ip6_tunnel_init); | |
1580 | module_exit(ip6_tunnel_cleanup); |