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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 LT |
59 | MODULE_LICENSE("GPL"); |
60 | ||
61 | #define IPV6_TLV_TEL_DST_SIZE 8 | |
62 | ||
63 | #ifdef IP6_TNL_DEBUG | |
0dc47877 | 64 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
65 | #else |
66 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
67 | #endif | |
68 | ||
69 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 70 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
71 | |
72 | #define HASH_SIZE 32 | |
73 | ||
e69a4adc | 74 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
75 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
76 | (HASH_SIZE - 1)) | |
1da177e4 | 77 | |
8560f226 | 78 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 79 | static void ip6_tnl_dev_setup(struct net_device *dev); |
1da177e4 | 80 | |
f99189b1 | 81 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 82 | struct ip6_tnl_net { |
15820e12 PE |
83 | /* the IPv6 tunnel fallback device */ |
84 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 85 | /* lists for storing tunnels in use */ |
94767632 ED |
86 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
87 | struct ip6_tnl __rcu *tnls_wc[1]; | |
88 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
89 | }; |
90 | ||
8560f226 ED |
91 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
92 | struct pcpu_tstats { | |
93 | unsigned long rx_packets; | |
94 | unsigned long rx_bytes; | |
95 | unsigned long tx_packets; | |
96 | unsigned long tx_bytes; | |
97 | }; | |
98 | ||
99 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
100 | { | |
101 | struct pcpu_tstats sum = { 0 }; | |
102 | int i; | |
103 | ||
104 | for_each_possible_cpu(i) { | |
105 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
106 | ||
107 | sum.rx_packets += tstats->rx_packets; | |
108 | sum.rx_bytes += tstats->rx_bytes; | |
109 | sum.tx_packets += tstats->tx_packets; | |
110 | sum.tx_bytes += tstats->tx_bytes; | |
111 | } | |
112 | dev->stats.rx_packets = sum.rx_packets; | |
113 | dev->stats.rx_bytes = sum.rx_bytes; | |
114 | dev->stats.tx_packets = sum.tx_packets; | |
115 | dev->stats.tx_bytes = sum.tx_bytes; | |
116 | return &dev->stats; | |
117 | } | |
118 | ||
2922bc8a | 119 | /* |
94767632 | 120 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 121 | */ |
1da177e4 LT |
122 | |
123 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
124 | { | |
125 | struct dst_entry *dst = t->dst_cache; | |
126 | ||
1ab1457c | 127 | if (dst && dst->obsolete && |
1da177e4 LT |
128 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
129 | t->dst_cache = NULL; | |
130 | dst_release(dst); | |
131 | return NULL; | |
132 | } | |
133 | ||
134 | return dst; | |
135 | } | |
136 | ||
137 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
138 | { | |
139 | dst_release(t->dst_cache); | |
140 | t->dst_cache = NULL; | |
141 | } | |
142 | ||
143 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
144 | { | |
145 | struct rt6_info *rt = (struct rt6_info *) dst; | |
146 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
147 | dst_release(t->dst_cache); | |
148 | t->dst_cache = dst; | |
149 | } | |
150 | ||
151 | /** | |
3144581c | 152 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
153 | * @remote: the address of the tunnel exit-point |
154 | * @local: the address of the tunnel entry-point | |
1da177e4 | 155 | * |
1ab1457c | 156 | * Return: |
1da177e4 | 157 | * tunnel matching given end-points if found, |
1ab1457c | 158 | * else fallback tunnel if its device is up, |
1da177e4 LT |
159 | * else %NULL |
160 | **/ | |
161 | ||
2922bc8a ED |
162 | #define for_each_ip6_tunnel_rcu(start) \ |
163 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
164 | ||
1da177e4 | 165 | static struct ip6_tnl * |
2dd02c89 | 166 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 | 167 | { |
94767632 ED |
168 | unsigned int h0 = HASH(remote); |
169 | unsigned int h1 = HASH(local); | |
1da177e4 | 170 | struct ip6_tnl *t; |
3e6c9fb5 | 171 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 172 | |
2922bc8a | 173 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
174 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
175 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
176 | (t->dev->flags & IFF_UP)) | |
177 | return t; | |
178 | } | |
2922bc8a ED |
179 | t = rcu_dereference(ip6n->tnls_wc[0]); |
180 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
181 | return t; |
182 | ||
183 | return NULL; | |
184 | } | |
185 | ||
186 | /** | |
3144581c | 187 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 188 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
189 | * |
190 | * Description: | |
3144581c | 191 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
192 | * &struct in6_addr entries laddr and raddr in @p. |
193 | * | |
1ab1457c | 194 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
195 | **/ |
196 | ||
94767632 | 197 | static struct ip6_tnl __rcu ** |
2dd02c89 | 198 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
199 | { |
200 | struct in6_addr *remote = &p->raddr; | |
201 | struct in6_addr *local = &p->laddr; | |
202 | unsigned h = 0; | |
203 | int prio = 0; | |
204 | ||
205 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
206 | prio = 1; | |
207 | h = HASH(remote) ^ HASH(local); | |
208 | } | |
3e6c9fb5 | 209 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
210 | } |
211 | ||
212 | /** | |
3144581c | 213 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
214 | * @t: tunnel to be added |
215 | **/ | |
216 | ||
217 | static void | |
2dd02c89 | 218 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 219 | { |
94767632 | 220 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 221 | |
94767632 | 222 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
2922bc8a | 223 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
224 | } |
225 | ||
226 | /** | |
3144581c | 227 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
228 | * @t: tunnel to be removed |
229 | **/ | |
230 | ||
231 | static void | |
2dd02c89 | 232 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 233 | { |
94767632 ED |
234 | struct ip6_tnl __rcu **tp; |
235 | struct ip6_tnl *iter; | |
236 | ||
237 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
238 | (iter = rtnl_dereference(*tp)) != NULL; | |
239 | tp = &iter->next) { | |
240 | if (t == iter) { | |
241 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
242 | break; |
243 | } | |
244 | } | |
245 | } | |
246 | ||
8560f226 ED |
247 | static void ip6_dev_free(struct net_device *dev) |
248 | { | |
249 | free_percpu(dev->tstats); | |
250 | free_netdev(dev); | |
251 | } | |
252 | ||
1da177e4 LT |
253 | /** |
254 | * ip6_tnl_create() - create a new tunnel | |
255 | * @p: tunnel parameters | |
256 | * @pt: pointer to new tunnel | |
257 | * | |
258 | * Description: | |
259 | * Create tunnel matching given parameters. | |
1ab1457c YH |
260 | * |
261 | * Return: | |
567131a7 | 262 | * created tunnel or NULL |
1da177e4 LT |
263 | **/ |
264 | ||
2dd02c89 | 265 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
266 | { |
267 | struct net_device *dev; | |
268 | struct ip6_tnl *t; | |
269 | char name[IFNAMSIZ]; | |
270 | int err; | |
2dd02c89 | 271 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 272 | |
34cc7ba6 | 273 | if (p->name[0]) |
1da177e4 | 274 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
275 | else |
276 | sprintf(name, "ip6tnl%%d"); | |
277 | ||
3144581c | 278 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 279 | if (dev == NULL) |
567131a7 | 280 | goto failed; |
1da177e4 | 281 | |
554eb277 PE |
282 | dev_net_set(dev, net); |
283 | ||
b37d428b PE |
284 | if (strchr(name, '%')) { |
285 | if (dev_alloc_name(dev, name) < 0) | |
286 | goto failed_free; | |
287 | } | |
288 | ||
2941a486 | 289 | t = netdev_priv(dev); |
1da177e4 | 290 | t->parms = *p; |
8560f226 ED |
291 | err = ip6_tnl_dev_init(dev); |
292 | if (err < 0) | |
293 | goto failed_free; | |
1da177e4 | 294 | |
b37d428b PE |
295 | if ((err = register_netdevice(dev)) < 0) |
296 | goto failed_free; | |
297 | ||
1da177e4 | 298 | dev_hold(dev); |
2dd02c89 | 299 | ip6_tnl_link(ip6n, t); |
567131a7 | 300 | return t; |
b37d428b PE |
301 | |
302 | failed_free: | |
8560f226 | 303 | ip6_dev_free(dev); |
567131a7 VN |
304 | failed: |
305 | return NULL; | |
1da177e4 LT |
306 | } |
307 | ||
308 | /** | |
3144581c | 309 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 310 | * @p: tunnel parameters |
1da177e4 LT |
311 | * @create: != 0 if allowed to create new tunnel if no match found |
312 | * | |
313 | * Description: | |
3144581c | 314 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
315 | * based on @parms. If this is unsuccessful, but @create is set a new |
316 | * tunnel device is created and registered for use. | |
317 | * | |
318 | * Return: | |
567131a7 | 319 | * matching tunnel or NULL |
1da177e4 LT |
320 | **/ |
321 | ||
2dd02c89 PE |
322 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
323 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
324 | { |
325 | struct in6_addr *remote = &p->raddr; | |
326 | struct in6_addr *local = &p->laddr; | |
94767632 | 327 | struct ip6_tnl __rcu **tp; |
1da177e4 | 328 | struct ip6_tnl *t; |
2dd02c89 | 329 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 330 | |
94767632 ED |
331 | for (tp = ip6_tnl_bucket(ip6n, p); |
332 | (t = rtnl_dereference(*tp)) != NULL; | |
333 | tp = &t->next) { | |
1da177e4 | 334 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
335 | ipv6_addr_equal(remote, &t->parms.raddr)) |
336 | return t; | |
1da177e4 LT |
337 | } |
338 | if (!create) | |
567131a7 | 339 | return NULL; |
2dd02c89 | 340 | return ip6_tnl_create(net, p); |
1da177e4 LT |
341 | } |
342 | ||
343 | /** | |
3144581c | 344 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 345 | * @dev: the device to be destroyed |
1ab1457c | 346 | * |
1da177e4 | 347 | * Description: |
3144581c | 348 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
349 | **/ |
350 | ||
351 | static void | |
3144581c | 352 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 353 | { |
2941a486 | 354 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
355 | struct net *net = dev_net(dev); |
356 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 357 | |
94767632 ED |
358 | if (dev == ip6n->fb_tnl_dev) |
359 | rcu_assign_pointer(ip6n->tnls_wc[0], NULL); | |
360 | else | |
2dd02c89 | 361 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
362 | ip6_tnl_dst_reset(t); |
363 | dev_put(dev); | |
364 | } | |
365 | ||
366 | /** | |
367 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
368 | * @skb: received socket buffer | |
369 | * | |
1ab1457c YH |
370 | * Return: |
371 | * 0 if none was found, | |
1da177e4 LT |
372 | * else index to encapsulation limit |
373 | **/ | |
374 | ||
375 | static __u16 | |
376 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
377 | { | |
378 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
379 | __u8 nexthdr = ipv6h->nexthdr; | |
380 | __u16 off = sizeof (*ipv6h); | |
381 | ||
382 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
383 | __u16 optlen = 0; | |
384 | struct ipv6_opt_hdr *hdr; | |
385 | if (raw + off + sizeof (*hdr) > skb->data && | |
386 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
387 | break; | |
388 | ||
389 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
390 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
391 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
392 | if (frag_hdr->frag_off) | |
393 | break; | |
394 | optlen = 8; | |
395 | } else if (nexthdr == NEXTHDR_AUTH) { | |
396 | optlen = (hdr->hdrlen + 2) << 2; | |
397 | } else { | |
398 | optlen = ipv6_optlen(hdr); | |
399 | } | |
400 | if (nexthdr == NEXTHDR_DEST) { | |
401 | __u16 i = off + 2; | |
402 | while (1) { | |
403 | struct ipv6_tlv_tnl_enc_lim *tel; | |
404 | ||
405 | /* No more room for encapsulation limit */ | |
406 | if (i + sizeof (*tel) > off + optlen) | |
407 | break; | |
408 | ||
409 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
410 | /* return index of option if found and valid */ | |
411 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
412 | tel->length == 1) | |
413 | return i; | |
414 | /* else jump to next option */ | |
415 | if (tel->type) | |
416 | i += tel->length + 2; | |
417 | else | |
418 | i++; | |
419 | } | |
420 | } | |
421 | nexthdr = hdr->nexthdr; | |
422 | off += optlen; | |
423 | } | |
424 | return 0; | |
425 | } | |
426 | ||
427 | /** | |
e490d1d8 | 428 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
429 | * |
430 | * Description: | |
e490d1d8 | 431 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
432 | * to the specifications in RFC 2473. |
433 | **/ | |
434 | ||
d2acc347 | 435 | static int |
502b0935 | 436 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 437 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
438 | { |
439 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
440 | struct ip6_tnl *t; | |
441 | int rel_msg = 0; | |
d5fdd6ba BH |
442 | u8 rel_type = ICMPV6_DEST_UNREACH; |
443 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
444 | __u32 rel_info = 0; |
445 | __u16 len; | |
d2acc347 | 446 | int err = -ENOENT; |
1da177e4 | 447 | |
1ab1457c YH |
448 | /* If the packet doesn't contain the original IPv6 header we are |
449 | in trouble since we might need the source address for further | |
1da177e4 LT |
450 | processing of the error. */ |
451 | ||
2922bc8a | 452 | rcu_read_lock(); |
8704ca7e | 453 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 454 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
455 | goto out; |
456 | ||
502b0935 YK |
457 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
458 | goto out; | |
459 | ||
d2acc347 HX |
460 | err = 0; |
461 | ||
e490d1d8 | 462 | switch (*type) { |
1da177e4 LT |
463 | __u32 teli; |
464 | struct ipv6_tlv_tnl_enc_lim *tel; | |
465 | __u32 mtu; | |
466 | case ICMPV6_DEST_UNREACH: | |
467 | if (net_ratelimit()) | |
468 | printk(KERN_WARNING | |
469 | "%s: Path to destination invalid " | |
470 | "or inactive!\n", t->parms.name); | |
471 | rel_msg = 1; | |
472 | break; | |
473 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 474 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
475 | if (net_ratelimit()) |
476 | printk(KERN_WARNING | |
477 | "%s: Too small hop limit or " | |
1ab1457c | 478 | "routing loop in tunnel!\n", |
1da177e4 LT |
479 | t->parms.name); |
480 | rel_msg = 1; | |
481 | } | |
482 | break; | |
483 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 484 | teli = 0; |
e490d1d8 | 485 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 486 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 487 | |
704eae1f | 488 | if (teli && teli == *info - 2) { |
1da177e4 LT |
489 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
490 | if (tel->encap_limit == 0) { | |
491 | if (net_ratelimit()) | |
492 | printk(KERN_WARNING | |
493 | "%s: Too small encapsulation " | |
494 | "limit or routing loop in " | |
495 | "tunnel!\n", t->parms.name); | |
496 | rel_msg = 1; | |
497 | } | |
107a5fe6 VN |
498 | } else if (net_ratelimit()) { |
499 | printk(KERN_WARNING | |
500 | "%s: Recipient unable to parse tunneled " | |
501 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
502 | } |
503 | break; | |
504 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 505 | mtu = *info - offset; |
1da177e4 LT |
506 | if (mtu < IPV6_MIN_MTU) |
507 | mtu = IPV6_MIN_MTU; | |
508 | t->dev->mtu = mtu; | |
509 | ||
cc6cdac0 | 510 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
511 | rel_type = ICMPV6_PKT_TOOBIG; |
512 | rel_code = 0; | |
513 | rel_info = mtu; | |
514 | rel_msg = 1; | |
515 | } | |
516 | break; | |
517 | } | |
e490d1d8 YK |
518 | |
519 | *type = rel_type; | |
520 | *code = rel_code; | |
521 | *info = rel_info; | |
522 | *msg = rel_msg; | |
523 | ||
524 | out: | |
2922bc8a | 525 | rcu_read_unlock(); |
e490d1d8 YK |
526 | return err; |
527 | } | |
528 | ||
c4d3efaf YK |
529 | static int |
530 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 531 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
532 | { |
533 | int rel_msg = 0; | |
d5fdd6ba BH |
534 | u8 rel_type = type; |
535 | u8 rel_code = code; | |
704eae1f | 536 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
537 | int err; |
538 | struct sk_buff *skb2; | |
539 | struct iphdr *eiph; | |
540 | struct flowi fl; | |
541 | struct rtable *rt; | |
542 | ||
502b0935 YK |
543 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
544 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
545 | if (err < 0) |
546 | return err; | |
547 | ||
548 | if (rel_msg == 0) | |
549 | return 0; | |
550 | ||
551 | switch (rel_type) { | |
552 | case ICMPV6_DEST_UNREACH: | |
553 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
554 | return 0; | |
555 | rel_type = ICMP_DEST_UNREACH; | |
556 | rel_code = ICMP_HOST_UNREACH; | |
557 | break; | |
558 | case ICMPV6_PKT_TOOBIG: | |
559 | if (rel_code != 0) | |
560 | return 0; | |
561 | rel_type = ICMP_DEST_UNREACH; | |
562 | rel_code = ICMP_FRAG_NEEDED; | |
563 | break; | |
564 | default: | |
565 | return 0; | |
566 | } | |
567 | ||
568 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
569 | return 0; | |
570 | ||
571 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
572 | if (!skb2) | |
573 | return 0; | |
574 | ||
adf30907 ED |
575 | skb_dst_drop(skb2); |
576 | ||
c4d3efaf | 577 | skb_pull(skb2, offset); |
c1d2bbe1 | 578 | skb_reset_network_header(skb2); |
eddc9ec5 | 579 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
580 | |
581 | /* Try to guess incoming interface */ | |
582 | memset(&fl, 0, sizeof(fl)); | |
583 | fl.fl4_dst = eiph->saddr; | |
584 | fl.fl4_tos = RT_TOS(eiph->tos); | |
585 | fl.proto = IPPROTO_IPIP; | |
2f7f54b7 | 586 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) |
c4d3efaf YK |
587 | goto out; |
588 | ||
d8d1f30b | 589 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
590 | |
591 | /* route "incoming" packet */ | |
592 | if (rt->rt_flags & RTCF_LOCAL) { | |
593 | ip_rt_put(rt); | |
594 | rt = NULL; | |
595 | fl.fl4_dst = eiph->daddr; | |
596 | fl.fl4_src = eiph->saddr; | |
597 | fl.fl4_tos = eiph->tos; | |
2f7f54b7 | 598 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || |
d8d1f30b | 599 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
c4d3efaf YK |
600 | ip_rt_put(rt); |
601 | goto out; | |
602 | } | |
adf30907 | 603 | skb_dst_set(skb2, (struct dst_entry *)rt); |
c4d3efaf YK |
604 | } else { |
605 | ip_rt_put(rt); | |
606 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
607 | skb2->dev) || | |
adf30907 | 608 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
609 | goto out; |
610 | } | |
611 | ||
612 | /* change mtu on this route */ | |
613 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 614 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
615 | goto out; |
616 | ||
adf30907 | 617 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
618 | } |
619 | ||
704eae1f | 620 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
621 | |
622 | out: | |
623 | kfree_skb(skb2); | |
624 | return 0; | |
625 | } | |
626 | ||
e490d1d8 YK |
627 | static int |
628 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 629 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
630 | { |
631 | int rel_msg = 0; | |
d5fdd6ba BH |
632 | u8 rel_type = type; |
633 | u8 rel_code = code; | |
704eae1f | 634 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
635 | int err; |
636 | ||
502b0935 YK |
637 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
638 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
639 | if (err < 0) |
640 | return err; | |
641 | ||
642 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
643 | struct rt6_info *rt; |
644 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 645 | |
1da177e4 | 646 | if (!skb2) |
e490d1d8 | 647 | return 0; |
1da177e4 | 648 | |
adf30907 | 649 | skb_dst_drop(skb2); |
1da177e4 | 650 | skb_pull(skb2, offset); |
c1d2bbe1 | 651 | skb_reset_network_header(skb2); |
1da177e4 LT |
652 | |
653 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
654 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
655 | NULL, 0, 0); | |
1da177e4 LT |
656 | |
657 | if (rt && rt->rt6i_dev) | |
658 | skb2->dev = rt->rt6i_dev; | |
659 | ||
3ffe533c | 660 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
661 | |
662 | if (rt) | |
d8d1f30b | 663 | dst_release(&rt->dst); |
1da177e4 LT |
664 | |
665 | kfree_skb(skb2); | |
666 | } | |
e490d1d8 YK |
667 | |
668 | return 0; | |
1da177e4 LT |
669 | } |
670 | ||
c4d3efaf YK |
671 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
672 | struct ipv6hdr *ipv6h, | |
673 | struct sk_buff *skb) | |
674 | { | |
675 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
676 | ||
677 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 678 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
679 | |
680 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 681 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
682 | } |
683 | ||
8359925b YK |
684 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
685 | struct ipv6hdr *ipv6h, | |
686 | struct sk_buff *skb) | |
1da177e4 | 687 | { |
8359925b | 688 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 689 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 690 | |
8359925b | 691 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 692 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 693 | } |
8359925b | 694 | |
f1a28eab | 695 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
696 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
697 | { | |
698 | struct ip6_tnl_parm *p = &t->parms; | |
699 | int ret = 0; | |
2f7f54b7 | 700 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
701 | |
702 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 703 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
704 | |
705 | if (p->link) | |
f1a28eab | 706 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
707 | |
708 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
709 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
710 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
711 | ret = 1; |
712 | ||
09c6bbf0 VN |
713 | } |
714 | return ret; | |
715 | } | |
1da177e4 LT |
716 | |
717 | /** | |
3144581c | 718 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 719 | * @skb: received socket buffer |
8359925b YK |
720 | * @protocol: ethernet protocol ID |
721 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
722 | * |
723 | * Return: 0 | |
724 | **/ | |
725 | ||
8359925b | 726 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 727 | __u8 ipproto, |
8359925b YK |
728 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
729 | struct ipv6hdr *ipv6h, | |
730 | struct sk_buff *skb)) | |
1da177e4 | 731 | { |
1da177e4 | 732 | struct ip6_tnl *t; |
0660e03f | 733 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 734 | |
2922bc8a | 735 | rcu_read_lock(); |
1da177e4 | 736 | |
8704ca7e | 737 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 738 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
739 | struct pcpu_tstats *tstats; |
740 | ||
502b0935 | 741 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 742 | rcu_read_unlock(); |
502b0935 YK |
743 | goto discard; |
744 | } | |
745 | ||
1da177e4 | 746 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 747 | rcu_read_unlock(); |
50fba2aa | 748 | goto discard; |
1da177e4 LT |
749 | } |
750 | ||
09c6bbf0 | 751 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 752 | t->dev->stats.rx_dropped++; |
2922bc8a | 753 | rcu_read_unlock(); |
1da177e4 LT |
754 | goto discard; |
755 | } | |
756 | secpath_reset(skb); | |
b0e380b1 | 757 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 758 | skb_reset_network_header(skb); |
8359925b | 759 | skb->protocol = htons(protocol); |
1da177e4 LT |
760 | skb->pkt_type = PACKET_HOST; |
761 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 762 | |
8560f226 ED |
763 | tstats = this_cpu_ptr(t->dev->tstats); |
764 | tstats->rx_packets++; | |
765 | tstats->rx_bytes += skb->len; | |
766 | ||
767 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 768 | |
d19d56dd | 769 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 770 | |
caf586e5 | 771 | netif_rx(skb); |
8990f468 | 772 | |
2922bc8a | 773 | rcu_read_unlock(); |
1da177e4 LT |
774 | return 0; |
775 | } | |
2922bc8a | 776 | rcu_read_unlock(); |
1da177e4 | 777 | return 1; |
50fba2aa HX |
778 | |
779 | discard: | |
780 | kfree_skb(skb); | |
781 | return 0; | |
1da177e4 LT |
782 | } |
783 | ||
c4d3efaf YK |
784 | static int ip4ip6_rcv(struct sk_buff *skb) |
785 | { | |
502b0935 YK |
786 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
787 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
788 | } |
789 | ||
8359925b YK |
790 | static int ip6ip6_rcv(struct sk_buff *skb) |
791 | { | |
502b0935 YK |
792 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
793 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
794 | } |
795 | ||
6fb32dde VN |
796 | struct ipv6_tel_txoption { |
797 | struct ipv6_txoptions ops; | |
798 | __u8 dst_opt[8]; | |
799 | }; | |
1da177e4 | 800 | |
6fb32dde VN |
801 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
802 | { | |
803 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 804 | |
6fb32dde VN |
805 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
806 | opt->dst_opt[3] = 1; | |
807 | opt->dst_opt[4] = encap_limit; | |
808 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
809 | opt->dst_opt[6] = 1; | |
1da177e4 | 810 | |
6fb32dde VN |
811 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
812 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
813 | } |
814 | ||
815 | /** | |
3144581c | 816 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 817 | * @t: the outgoing tunnel device |
1ab1457c | 818 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
819 | * |
820 | * Description: | |
1ab1457c | 821 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
822 | * doesn't match source of incoming packet. |
823 | * | |
1ab1457c | 824 | * Return: |
1da177e4 LT |
825 | * 1 if conflict, |
826 | * 0 else | |
827 | **/ | |
828 | ||
829 | static inline int | |
3144581c | 830 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
831 | { |
832 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
833 | } | |
834 | ||
09c6bbf0 VN |
835 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
836 | { | |
837 | struct ip6_tnl_parm *p = &t->parms; | |
838 | int ret = 0; | |
2f7f54b7 | 839 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 840 | |
1ab1457c | 841 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
842 | struct net_device *ldev = NULL; |
843 | ||
f1a28eab | 844 | rcu_read_lock(); |
09c6bbf0 | 845 | if (p->link) |
f1a28eab | 846 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 847 | |
2f7f54b7 | 848 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
849 | printk(KERN_WARNING |
850 | "%s xmit: Local address not yet configured!\n", | |
851 | p->name); | |
852 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 853 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
854 | printk(KERN_WARNING |
855 | "%s xmit: Routing loop! " | |
856 | "Remote address found on this node!\n", | |
857 | p->name); | |
858 | else | |
859 | ret = 1; | |
f1a28eab | 860 | rcu_read_unlock(); |
09c6bbf0 VN |
861 | } |
862 | return ret; | |
863 | } | |
1da177e4 | 864 | /** |
61ec2aec | 865 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 866 | * @skb: the outgoing socket buffer |
1ab1457c | 867 | * @dev: the outgoing tunnel device |
61ec2aec YK |
868 | * @dsfield: dscp code for outer header |
869 | * @fl: flow of tunneled packet | |
870 | * @encap_limit: encapsulation limit | |
871 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
872 | * |
873 | * Description: | |
874 | * Build new header and do some sanity checks on the packet before sending | |
875 | * it. | |
876 | * | |
1ab1457c | 877 | * Return: |
c4d3efaf | 878 | * 0 on success |
61ec2aec YK |
879 | * -1 fail |
880 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
881 | **/ |
882 | ||
61ec2aec YK |
883 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
884 | struct net_device *dev, | |
885 | __u8 dsfield, | |
886 | struct flowi *fl, | |
887 | int encap_limit, | |
888 | __u32 *pmtu) | |
1da177e4 | 889 | { |
52479b62 | 890 | struct net *net = dev_net(dev); |
2941a486 | 891 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 892 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 893 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 894 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
895 | struct dst_entry *dst; |
896 | struct net_device *tdev; | |
897 | int mtu; | |
c2636b4d | 898 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 899 | u8 proto; |
61ec2aec | 900 | int err = -1; |
1da177e4 | 901 | int pkt_len; |
1da177e4 | 902 | |
1da177e4 LT |
903 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
904 | dst_hold(dst); | |
a57ebc90 | 905 | else { |
52479b62 | 906 | dst = ip6_route_output(net, NULL, fl); |
1da177e4 | 907 | |
52479b62 | 908 | if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
909 | goto tx_err_link_failure; |
910 | } | |
1da177e4 LT |
911 | |
912 | tdev = dst->dev; | |
913 | ||
914 | if (tdev == dev) { | |
915 | stats->collisions++; | |
916 | if (net_ratelimit()) | |
1ab1457c | 917 | printk(KERN_WARNING |
1da177e4 LT |
918 | "%s: Local routing loop detected!\n", |
919 | t->parms.name); | |
920 | goto tx_err_dst_release; | |
921 | } | |
922 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 923 | if (encap_limit >= 0) { |
1da177e4 LT |
924 | max_headroom += 8; |
925 | mtu -= 8; | |
926 | } | |
927 | if (mtu < IPV6_MIN_MTU) | |
928 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
929 | if (skb_dst(skb)) |
930 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 931 | if (skb->len > mtu) { |
61ec2aec YK |
932 | *pmtu = mtu; |
933 | err = -EMSGSIZE; | |
1da177e4 LT |
934 | goto tx_err_dst_release; |
935 | } | |
936 | ||
937 | /* | |
938 | * Okay, now see if we can stuff it in the buffer as-is. | |
939 | */ | |
940 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 941 | |
cfbba49d PM |
942 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
943 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 944 | struct sk_buff *new_skb; |
1ab1457c | 945 | |
1da177e4 LT |
946 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
947 | goto tx_err_dst_release; | |
948 | ||
949 | if (skb->sk) | |
950 | skb_set_owner_w(new_skb, skb->sk); | |
951 | kfree_skb(skb); | |
952 | skb = new_skb; | |
953 | } | |
adf30907 ED |
954 | skb_dst_drop(skb); |
955 | skb_dst_set(skb, dst_clone(dst)); | |
1da177e4 | 956 | |
b0e380b1 | 957 | skb->transport_header = skb->network_header; |
1da177e4 | 958 | |
61ec2aec | 959 | proto = fl->proto; |
6fb32dde VN |
960 | if (encap_limit >= 0) { |
961 | init_tel_txopt(&opt, encap_limit); | |
962 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
963 | } | |
e2d1bca7 ACM |
964 | skb_push(skb, sizeof(struct ipv6hdr)); |
965 | skb_reset_network_header(skb); | |
0660e03f | 966 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 967 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
968 | dsfield = INET_ECN_encapsulate(0, dsfield); |
969 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
970 | ipv6h->hop_limit = t->parms.hop_limit; |
971 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
972 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
973 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
974 | nf_reset(skb); |
975 | pkt_len = skb->len; | |
ef76bc23 | 976 | err = ip6_local_out(skb); |
1da177e4 | 977 | |
b9df3cb8 | 978 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
979 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
980 | ||
981 | tstats->tx_bytes += pkt_len; | |
982 | tstats->tx_packets++; | |
1da177e4 LT |
983 | } else { |
984 | stats->tx_errors++; | |
985 | stats->tx_aborted_errors++; | |
986 | } | |
987 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
988 | return 0; |
989 | tx_err_link_failure: | |
990 | stats->tx_carrier_errors++; | |
991 | dst_link_failure(skb); | |
992 | tx_err_dst_release: | |
993 | dst_release(dst); | |
61ec2aec YK |
994 | return err; |
995 | } | |
996 | ||
c4d3efaf YK |
997 | static inline int |
998 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
999 | { | |
1000 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 1001 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
1002 | int encap_limit = -1; |
1003 | struct flowi fl; | |
1004 | __u8 dsfield; | |
1005 | __u32 mtu; | |
1006 | int err; | |
1007 | ||
502b0935 YK |
1008 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1009 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1010 | return -1; |
1011 | ||
1012 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1013 | encap_limit = t->parms.encap_limit; | |
1014 | ||
1015 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1016 | fl.proto = IPPROTO_IPIP; | |
1017 | ||
1018 | dsfield = ipv4_get_dsfield(iph); | |
1019 | ||
1020 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
1021 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
1022 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
1023 | |
1024 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1025 | if (err != 0) { | |
1026 | /* XXX: send ICMP error even if DF is not set. */ | |
1027 | if (err == -EMSGSIZE) | |
1028 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1029 | htonl(mtu)); | |
1030 | return -1; | |
1031 | } | |
1032 | ||
1033 | return 0; | |
1034 | } | |
1035 | ||
61ec2aec YK |
1036 | static inline int |
1037 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1038 | { | |
1039 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1040 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1041 | int encap_limit = -1; |
1042 | __u16 offset; | |
1043 | struct flowi fl; | |
1044 | __u8 dsfield; | |
1045 | __u32 mtu; | |
1046 | int err; | |
1047 | ||
502b0935 YK |
1048 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1049 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1050 | return -1; |
1051 | ||
d56f90a7 ACM |
1052 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1053 | if (offset > 0) { | |
61ec2aec | 1054 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1055 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1056 | if (tel->encap_limit == 0) { |
1057 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1058 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1059 | return -1; |
1060 | } | |
1061 | encap_limit = tel->encap_limit - 1; | |
1062 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1063 | encap_limit = t->parms.encap_limit; | |
1064 | ||
1065 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1066 | fl.proto = IPPROTO_IPV6; | |
1067 | ||
1068 | dsfield = ipv6_get_dsfield(ipv6h); | |
1069 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1070 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1071 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1072 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1073 | ||
1074 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1075 | if (err != 0) { | |
1076 | if (err == -EMSGSIZE) | |
3ffe533c | 1077 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1078 | return -1; |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
6fef4c0c | 1084 | static netdev_tx_t |
61ec2aec YK |
1085 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1086 | { | |
1087 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1088 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1089 | int ret; |
1090 | ||
61ec2aec | 1091 | switch (skb->protocol) { |
60678040 | 1092 | case htons(ETH_P_IP): |
c4d3efaf YK |
1093 | ret = ip4ip6_tnl_xmit(skb, dev); |
1094 | break; | |
60678040 | 1095 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1096 | ret = ip6ip6_tnl_xmit(skb, dev); |
1097 | break; | |
1098 | default: | |
1099 | goto tx_err; | |
1100 | } | |
1101 | ||
1102 | if (ret < 0) | |
1103 | goto tx_err; | |
1104 | ||
6ed10654 | 1105 | return NETDEV_TX_OK; |
61ec2aec | 1106 | |
1da177e4 LT |
1107 | tx_err: |
1108 | stats->tx_errors++; | |
1109 | stats->tx_dropped++; | |
1110 | kfree_skb(skb); | |
6ed10654 | 1111 | return NETDEV_TX_OK; |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1115 | { | |
1116 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1117 | int ltype = ipv6_addr_type(&p->laddr); |
1118 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1119 | |
1120 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1121 | ||
09c6bbf0 VN |
1122 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1123 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1124 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1125 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1126 | if (ltype&IPV6_ADDR_UNICAST) |
1127 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1128 | if (rtype&IPV6_ADDR_UNICAST) | |
1129 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1130 | } |
1131 | } | |
1132 | ||
3144581c | 1133 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1134 | { |
1135 | struct net_device *dev = t->dev; | |
1136 | struct ip6_tnl_parm *p = &t->parms; | |
1137 | struct flowi *fl = &t->fl; | |
1138 | ||
3a6d54c5 JP |
1139 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1140 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1141 | |
1142 | /* Set up flowi template */ | |
1143 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1144 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1145 | fl->oif = p->link; | |
1146 | fl->fl6_flowlabel = 0; | |
1147 | ||
1148 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1149 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1150 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1151 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1152 | ||
1153 | ip6_tnl_set_cap(t); | |
1154 | ||
1155 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1156 | dev->flags |= IFF_POINTOPOINT; | |
1157 | else | |
1158 | dev->flags &= ~IFF_POINTOPOINT; | |
1159 | ||
1160 | dev->iflink = p->link; | |
1161 | ||
1162 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1163 | int strict = (ipv6_addr_type(&p->raddr) & |
1164 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1165 | ||
2f7f54b7 PE |
1166 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1167 | &p->raddr, &p->laddr, | |
305d4b3c | 1168 | p->link, strict); |
1da177e4 LT |
1169 | |
1170 | if (rt == NULL) | |
1171 | return; | |
1172 | ||
1173 | if (rt->rt6i_dev) { | |
1174 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1175 | sizeof (struct ipv6hdr); | |
1176 | ||
1177 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
1178 | ||
1179 | if (dev->mtu < IPV6_MIN_MTU) | |
1180 | dev->mtu = IPV6_MIN_MTU; | |
1181 | } | |
d8d1f30b | 1182 | dst_release(&rt->dst); |
1da177e4 LT |
1183 | } |
1184 | } | |
1185 | ||
1186 | /** | |
3144581c | 1187 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1188 | * @t: tunnel to be changed |
1189 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1190 | * |
1191 | * Description: | |
3144581c | 1192 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1193 | **/ |
1194 | ||
1195 | static int | |
3144581c | 1196 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1197 | { |
1198 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1199 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1200 | t->parms.flags = p->flags; | |
1201 | t->parms.hop_limit = p->hop_limit; | |
1202 | t->parms.encap_limit = p->encap_limit; | |
1203 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1204 | t->parms.link = p->link; |
502b0935 | 1205 | t->parms.proto = p->proto; |
0c088890 | 1206 | ip6_tnl_dst_reset(t); |
3144581c | 1207 | ip6_tnl_link_config(t); |
1da177e4 LT |
1208 | return 0; |
1209 | } | |
1210 | ||
1211 | /** | |
3144581c | 1212 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1213 | * @dev: virtual device associated with tunnel |
1214 | * @ifr: parameters passed from userspace | |
1215 | * @cmd: command to be performed | |
1216 | * | |
1217 | * Description: | |
3144581c | 1218 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1219 | * from userspace. |
1da177e4 LT |
1220 | * |
1221 | * The possible commands are the following: | |
1222 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1223 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1224 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1225 | * %SIOCDELTUNNEL: delete tunnel | |
1226 | * | |
1ab1457c | 1227 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1228 | * initialization, can be used for creating other tunnel devices. |
1229 | * | |
1230 | * Return: | |
1231 | * 0 on success, | |
1232 | * %-EFAULT if unable to copy data to or from userspace, | |
1233 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1234 | * %-EINVAL if passed tunnel parameters are invalid, | |
1235 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1236 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1237 | **/ | |
1238 | ||
1239 | static int | |
3144581c | 1240 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1241 | { |
1242 | int err = 0; | |
1da177e4 LT |
1243 | struct ip6_tnl_parm p; |
1244 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1245 | struct net *net = dev_net(dev); |
1246 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1247 | |
1248 | switch (cmd) { | |
1249 | case SIOCGETTUNNEL: | |
15820e12 | 1250 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1251 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1252 | err = -EFAULT; |
1253 | break; | |
1254 | } | |
2dd02c89 | 1255 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1256 | } |
1257 | if (t == NULL) | |
2941a486 | 1258 | t = netdev_priv(dev); |
1da177e4 LT |
1259 | memcpy(&p, &t->parms, sizeof (p)); |
1260 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1261 | err = -EFAULT; | |
1262 | } | |
1263 | break; | |
1264 | case SIOCADDTUNNEL: | |
1265 | case SIOCCHGTUNNEL: | |
1266 | err = -EPERM; | |
1da177e4 LT |
1267 | if (!capable(CAP_NET_ADMIN)) |
1268 | break; | |
567131a7 VN |
1269 | err = -EFAULT; |
1270 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1271 | break; |
567131a7 | 1272 | err = -EINVAL; |
502b0935 YK |
1273 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1274 | p.proto != 0) | |
1da177e4 | 1275 | break; |
2dd02c89 | 1276 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1277 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1278 | if (t != NULL) { |
1279 | if (t->dev != dev) { | |
1280 | err = -EEXIST; | |
1281 | break; | |
1282 | } | |
1283 | } else | |
1284 | t = netdev_priv(dev); | |
1285 | ||
2dd02c89 | 1286 | ip6_tnl_unlink(ip6n, t); |
3144581c | 1287 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1288 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1289 | netdev_state_change(dev); |
1290 | } | |
567131a7 | 1291 | if (t) { |
1da177e4 | 1292 | err = 0; |
567131a7 VN |
1293 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1294 | err = -EFAULT; | |
1295 | ||
1296 | } else | |
1297 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1298 | break; |
1299 | case SIOCDELTUNNEL: | |
1300 | err = -EPERM; | |
1301 | if (!capable(CAP_NET_ADMIN)) | |
1302 | break; | |
1303 | ||
15820e12 | 1304 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1305 | err = -EFAULT; |
1306 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1307 | break; |
567131a7 | 1308 | err = -ENOENT; |
2dd02c89 | 1309 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1310 | break; |
567131a7 | 1311 | err = -EPERM; |
15820e12 | 1312 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1313 | break; |
567131a7 | 1314 | dev = t->dev; |
1da177e4 | 1315 | } |
22f8cde5 SH |
1316 | err = 0; |
1317 | unregister_netdevice(dev); | |
1da177e4 LT |
1318 | break; |
1319 | default: | |
1320 | err = -EINVAL; | |
1321 | } | |
1322 | return err; | |
1323 | } | |
1324 | ||
1da177e4 | 1325 | /** |
3144581c | 1326 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1327 | * @dev: virtual device associated with tunnel |
1328 | * @new_mtu: the new mtu | |
1329 | * | |
1330 | * Return: | |
1331 | * 0 on success, | |
1332 | * %-EINVAL if mtu too small | |
1333 | **/ | |
1334 | ||
1335 | static int | |
3144581c | 1336 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1337 | { |
1338 | if (new_mtu < IPV6_MIN_MTU) { | |
1339 | return -EINVAL; | |
1340 | } | |
1341 | dev->mtu = new_mtu; | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1326c3d5 SH |
1345 | |
1346 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1347 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1348 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1349 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1350 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1351 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1352 | }; |
1353 | ||
8560f226 | 1354 | |
1da177e4 | 1355 | /** |
3144581c | 1356 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1357 | * @dev: virtual device associated with tunnel |
1358 | * | |
1359 | * Description: | |
1360 | * Initialize function pointers and device parameters | |
1361 | **/ | |
1362 | ||
3144581c | 1363 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1364 | { |
1326c3d5 | 1365 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1366 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1367 | |
1368 | dev->type = ARPHRD_TUNNEL6; | |
1369 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1370 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1371 | dev->flags |= IFF_NOARP; | |
1372 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1373 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | ||
1377 | /** | |
3144581c | 1378 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1379 | * @dev: virtual device associated with tunnel |
1380 | **/ | |
1381 | ||
8560f226 | 1382 | static inline int |
3144581c | 1383 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1384 | { |
2941a486 | 1385 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1386 | |
1da177e4 LT |
1387 | t->dev = dev; |
1388 | strcpy(t->parms.name, dev->name); | |
8560f226 ED |
1389 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1390 | if (!dev->tstats) | |
1391 | return -ENOMEM; | |
1392 | return 0; | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | /** | |
3144581c | 1396 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1397 | * @dev: virtual device associated with tunnel |
1398 | **/ | |
1399 | ||
8560f226 | 1400 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1401 | { |
2941a486 | 1402 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1403 | int err = ip6_tnl_dev_init_gen(dev); |
1404 | ||
1405 | if (err) | |
1406 | return err; | |
3144581c | 1407 | ip6_tnl_link_config(t); |
8560f226 | 1408 | return 0; |
1da177e4 LT |
1409 | } |
1410 | ||
1411 | /** | |
3144581c | 1412 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1413 | * @dev: fallback device |
1414 | * | |
1415 | * Return: 0 | |
1416 | **/ | |
1417 | ||
8560f226 | 1418 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1419 | { |
2941a486 | 1420 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1421 | struct net *net = dev_net(dev); |
1422 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1423 | int err = ip6_tnl_dev_init_gen(dev); |
1424 | ||
1425 | if (err) | |
1426 | return err; | |
3e6c9fb5 | 1427 | |
502b0935 | 1428 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1429 | dev_hold(dev); |
94767632 | 1430 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1431 | return 0; |
1da177e4 LT |
1432 | } |
1433 | ||
3ff2cfa5 | 1434 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1435 | .handler = ip4ip6_rcv, |
1436 | .err_handler = ip4ip6_err, | |
1437 | .priority = 1, | |
1438 | }; | |
1439 | ||
3ff2cfa5 | 1440 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1441 | .handler = ip6ip6_rcv, |
1442 | .err_handler = ip6ip6_err, | |
d2acc347 | 1443 | .priority = 1, |
1da177e4 LT |
1444 | }; |
1445 | ||
2c8c1e72 | 1446 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1447 | { |
1448 | int h; | |
1449 | struct ip6_tnl *t; | |
cf4432f5 | 1450 | LIST_HEAD(list); |
3e6c9fb5 PE |
1451 | |
1452 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1453 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1454 | while (t != NULL) { |
1455 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1456 | t = rtnl_dereference(t->next); |
cf4432f5 | 1457 | } |
3e6c9fb5 PE |
1458 | } |
1459 | ||
94767632 | 1460 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1461 | unregister_netdevice_queue(t->dev, &list); |
1462 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1463 | } |
1464 | ||
2c8c1e72 | 1465 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1466 | { |
ac31cd3c | 1467 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1468 | int err; |
13eeb8e9 | 1469 | |
3e6c9fb5 PE |
1470 | ip6n->tnls[0] = ip6n->tnls_wc; |
1471 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1472 | ||
15820e12 PE |
1473 | err = -ENOMEM; |
1474 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1475 | ip6_tnl_dev_setup); | |
1476 | ||
1477 | if (!ip6n->fb_tnl_dev) | |
1478 | goto err_alloc_dev; | |
be77e593 | 1479 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1480 | |
8560f226 ED |
1481 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1482 | if (err < 0) | |
1483 | goto err_register; | |
15820e12 PE |
1484 | |
1485 | err = register_netdev(ip6n->fb_tnl_dev); | |
1486 | if (err < 0) | |
1487 | goto err_register; | |
13eeb8e9 PE |
1488 | return 0; |
1489 | ||
15820e12 | 1490 | err_register: |
8560f226 | 1491 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1492 | err_alloc_dev: |
13eeb8e9 PE |
1493 | return err; |
1494 | } | |
1495 | ||
2c8c1e72 | 1496 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1497 | { |
ac31cd3c | 1498 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1499 | |
3e6c9fb5 PE |
1500 | rtnl_lock(); |
1501 | ip6_tnl_destroy_tunnels(ip6n); | |
1502 | rtnl_unlock(); | |
13eeb8e9 PE |
1503 | } |
1504 | ||
1505 | static struct pernet_operations ip6_tnl_net_ops = { | |
1506 | .init = ip6_tnl_init_net, | |
1507 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1508 | .id = &ip6_tnl_net_id, |
1509 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1510 | }; |
1511 | ||
1da177e4 LT |
1512 | /** |
1513 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1514 | * | |
1515 | * Return: 0 on success | |
1516 | **/ | |
1517 | ||
1518 | static int __init ip6_tunnel_init(void) | |
1519 | { | |
1520 | int err; | |
1521 | ||
d5aa407f AD |
1522 | err = register_pernet_device(&ip6_tnl_net_ops); |
1523 | if (err < 0) | |
1524 | goto out_pernet; | |
1525 | ||
1526 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1527 | if (err < 0) { | |
3144581c | 1528 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1529 | goto out_ip4ip6; |
c4d3efaf YK |
1530 | } |
1531 | ||
d5aa407f AD |
1532 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1533 | if (err < 0) { | |
3144581c | 1534 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1535 | goto out_ip6ip6; |
1da177e4 | 1536 | } |
13eeb8e9 | 1537 | |
1da177e4 | 1538 | return 0; |
d5aa407f AD |
1539 | |
1540 | out_ip6ip6: | |
c4d3efaf | 1541 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1542 | out_ip4ip6: |
1543 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1544 | out_pernet: | |
1da177e4 LT |
1545 | return err; |
1546 | } | |
1547 | ||
1548 | /** | |
1549 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1550 | **/ | |
1551 | ||
1552 | static void __exit ip6_tunnel_cleanup(void) | |
1553 | { | |
c4d3efaf | 1554 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1555 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1556 | |
73d605d1 | 1557 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1558 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1559 | |
ac31cd3c | 1560 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1561 | } |
1562 | ||
1563 | module_init(ip6_tunnel_init); | |
1564 | module_exit(ip6_tunnel_cleanup); |