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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 | ||
1da177e4 | 61 | #ifdef IP6_TNL_DEBUG |
0dc47877 | 62 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
63 | #else |
64 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
65 | #endif | |
66 | ||
67 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 68 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
69 | |
70 | #define HASH_SIZE 32 | |
71 | ||
e69a4adc | 72 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
73 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
74 | (HASH_SIZE - 1)) | |
1da177e4 | 75 | |
8560f226 | 76 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 77 | static void ip6_tnl_dev_setup(struct net_device *dev); |
1da177e4 | 78 | |
f99189b1 | 79 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 80 | struct ip6_tnl_net { |
15820e12 PE |
81 | /* the IPv6 tunnel fallback device */ |
82 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 83 | /* lists for storing tunnels in use */ |
94767632 ED |
84 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
85 | struct ip6_tnl __rcu *tnls_wc[1]; | |
86 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
87 | }; |
88 | ||
8560f226 ED |
89 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
90 | struct pcpu_tstats { | |
91 | unsigned long rx_packets; | |
92 | unsigned long rx_bytes; | |
93 | unsigned long tx_packets; | |
94 | unsigned long tx_bytes; | |
95 | }; | |
96 | ||
97 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
98 | { | |
99 | struct pcpu_tstats sum = { 0 }; | |
100 | int i; | |
101 | ||
102 | for_each_possible_cpu(i) { | |
103 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
104 | ||
105 | sum.rx_packets += tstats->rx_packets; | |
106 | sum.rx_bytes += tstats->rx_bytes; | |
107 | sum.tx_packets += tstats->tx_packets; | |
108 | sum.tx_bytes += tstats->tx_bytes; | |
109 | } | |
110 | dev->stats.rx_packets = sum.rx_packets; | |
111 | dev->stats.rx_bytes = sum.rx_bytes; | |
112 | dev->stats.tx_packets = sum.tx_packets; | |
113 | dev->stats.tx_bytes = sum.tx_bytes; | |
114 | return &dev->stats; | |
115 | } | |
116 | ||
2922bc8a | 117 | /* |
94767632 | 118 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 119 | */ |
1da177e4 LT |
120 | |
121 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
122 | { | |
123 | struct dst_entry *dst = t->dst_cache; | |
124 | ||
1ab1457c | 125 | if (dst && dst->obsolete && |
1da177e4 LT |
126 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
127 | t->dst_cache = NULL; | |
128 | dst_release(dst); | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | return dst; | |
133 | } | |
134 | ||
135 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
136 | { | |
137 | dst_release(t->dst_cache); | |
138 | t->dst_cache = NULL; | |
139 | } | |
140 | ||
141 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
142 | { | |
143 | struct rt6_info *rt = (struct rt6_info *) dst; | |
144 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
145 | dst_release(t->dst_cache); | |
146 | t->dst_cache = dst; | |
147 | } | |
148 | ||
149 | /** | |
3144581c | 150 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
151 | * @remote: the address of the tunnel exit-point |
152 | * @local: the address of the tunnel entry-point | |
1da177e4 | 153 | * |
1ab1457c | 154 | * Return: |
1da177e4 | 155 | * tunnel matching given end-points if found, |
1ab1457c | 156 | * else fallback tunnel if its device is up, |
1da177e4 LT |
157 | * else %NULL |
158 | **/ | |
159 | ||
2922bc8a ED |
160 | #define for_each_ip6_tunnel_rcu(start) \ |
161 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
162 | ||
1da177e4 | 163 | static struct ip6_tnl * |
2dd02c89 | 164 | ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) |
1da177e4 | 165 | { |
94767632 ED |
166 | unsigned int h0 = HASH(remote); |
167 | unsigned int h1 = HASH(local); | |
1da177e4 | 168 | struct ip6_tnl *t; |
3e6c9fb5 | 169 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 170 | |
2922bc8a | 171 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
172 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
173 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
174 | (t->dev->flags & IFF_UP)) | |
175 | return t; | |
176 | } | |
2922bc8a ED |
177 | t = rcu_dereference(ip6n->tnls_wc[0]); |
178 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
179 | return t; |
180 | ||
181 | return NULL; | |
182 | } | |
183 | ||
184 | /** | |
3144581c | 185 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 186 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
187 | * |
188 | * Description: | |
3144581c | 189 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
190 | * &struct in6_addr entries laddr and raddr in @p. |
191 | * | |
1ab1457c | 192 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
193 | **/ |
194 | ||
94767632 | 195 | static struct ip6_tnl __rcu ** |
2dd02c89 | 196 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) |
1da177e4 LT |
197 | { |
198 | struct in6_addr *remote = &p->raddr; | |
199 | struct in6_addr *local = &p->laddr; | |
200 | unsigned h = 0; | |
201 | int prio = 0; | |
202 | ||
203 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
204 | prio = 1; | |
205 | h = HASH(remote) ^ HASH(local); | |
206 | } | |
3e6c9fb5 | 207 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
208 | } |
209 | ||
210 | /** | |
3144581c | 211 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
212 | * @t: tunnel to be added |
213 | **/ | |
214 | ||
215 | static void | |
2dd02c89 | 216 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 217 | { |
94767632 | 218 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 219 | |
94767632 | 220 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
2922bc8a | 221 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
222 | } |
223 | ||
224 | /** | |
3144581c | 225 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
226 | * @t: tunnel to be removed |
227 | **/ | |
228 | ||
229 | static void | |
2dd02c89 | 230 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 231 | { |
94767632 ED |
232 | struct ip6_tnl __rcu **tp; |
233 | struct ip6_tnl *iter; | |
234 | ||
235 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
236 | (iter = rtnl_dereference(*tp)) != NULL; | |
237 | tp = &iter->next) { | |
238 | if (t == iter) { | |
239 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
240 | break; |
241 | } | |
242 | } | |
243 | } | |
244 | ||
8560f226 ED |
245 | static void ip6_dev_free(struct net_device *dev) |
246 | { | |
247 | free_percpu(dev->tstats); | |
248 | free_netdev(dev); | |
249 | } | |
250 | ||
1da177e4 LT |
251 | /** |
252 | * ip6_tnl_create() - create a new tunnel | |
253 | * @p: tunnel parameters | |
254 | * @pt: pointer to new tunnel | |
255 | * | |
256 | * Description: | |
257 | * Create tunnel matching given parameters. | |
1ab1457c YH |
258 | * |
259 | * Return: | |
567131a7 | 260 | * created tunnel or NULL |
1da177e4 LT |
261 | **/ |
262 | ||
2dd02c89 | 263 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
264 | { |
265 | struct net_device *dev; | |
266 | struct ip6_tnl *t; | |
267 | char name[IFNAMSIZ]; | |
268 | int err; | |
2dd02c89 | 269 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 270 | |
34cc7ba6 | 271 | if (p->name[0]) |
1da177e4 | 272 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
273 | else |
274 | sprintf(name, "ip6tnl%%d"); | |
275 | ||
3144581c | 276 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 277 | if (dev == NULL) |
567131a7 | 278 | goto failed; |
1da177e4 | 279 | |
554eb277 PE |
280 | dev_net_set(dev, net); |
281 | ||
b37d428b PE |
282 | if (strchr(name, '%')) { |
283 | if (dev_alloc_name(dev, name) < 0) | |
284 | goto failed_free; | |
285 | } | |
286 | ||
2941a486 | 287 | t = netdev_priv(dev); |
1da177e4 | 288 | t->parms = *p; |
8560f226 ED |
289 | err = ip6_tnl_dev_init(dev); |
290 | if (err < 0) | |
291 | goto failed_free; | |
1da177e4 | 292 | |
b37d428b PE |
293 | if ((err = register_netdevice(dev)) < 0) |
294 | goto failed_free; | |
295 | ||
1da177e4 | 296 | dev_hold(dev); |
2dd02c89 | 297 | ip6_tnl_link(ip6n, t); |
567131a7 | 298 | return t; |
b37d428b PE |
299 | |
300 | failed_free: | |
8560f226 | 301 | ip6_dev_free(dev); |
567131a7 VN |
302 | failed: |
303 | return NULL; | |
1da177e4 LT |
304 | } |
305 | ||
306 | /** | |
3144581c | 307 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 308 | * @p: tunnel parameters |
1da177e4 LT |
309 | * @create: != 0 if allowed to create new tunnel if no match found |
310 | * | |
311 | * Description: | |
3144581c | 312 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
313 | * based on @parms. If this is unsuccessful, but @create is set a new |
314 | * tunnel device is created and registered for use. | |
315 | * | |
316 | * Return: | |
567131a7 | 317 | * matching tunnel or NULL |
1da177e4 LT |
318 | **/ |
319 | ||
2dd02c89 PE |
320 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
321 | struct ip6_tnl_parm *p, int create) | |
1da177e4 LT |
322 | { |
323 | struct in6_addr *remote = &p->raddr; | |
324 | struct in6_addr *local = &p->laddr; | |
94767632 | 325 | struct ip6_tnl __rcu **tp; |
1da177e4 | 326 | struct ip6_tnl *t; |
2dd02c89 | 327 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 328 | |
94767632 ED |
329 | for (tp = ip6_tnl_bucket(ip6n, p); |
330 | (t = rtnl_dereference(*tp)) != NULL; | |
331 | tp = &t->next) { | |
1da177e4 | 332 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
333 | ipv6_addr_equal(remote, &t->parms.raddr)) |
334 | return t; | |
1da177e4 LT |
335 | } |
336 | if (!create) | |
567131a7 | 337 | return NULL; |
2dd02c89 | 338 | return ip6_tnl_create(net, p); |
1da177e4 LT |
339 | } |
340 | ||
341 | /** | |
3144581c | 342 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 343 | * @dev: the device to be destroyed |
1ab1457c | 344 | * |
1da177e4 | 345 | * Description: |
3144581c | 346 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
347 | **/ |
348 | ||
349 | static void | |
3144581c | 350 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 351 | { |
2941a486 | 352 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
353 | struct net *net = dev_net(dev); |
354 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 355 | |
94767632 ED |
356 | if (dev == ip6n->fb_tnl_dev) |
357 | rcu_assign_pointer(ip6n->tnls_wc[0], NULL); | |
358 | else | |
2dd02c89 | 359 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
360 | ip6_tnl_dst_reset(t); |
361 | dev_put(dev); | |
362 | } | |
363 | ||
364 | /** | |
365 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
366 | * @skb: received socket buffer | |
367 | * | |
1ab1457c YH |
368 | * Return: |
369 | * 0 if none was found, | |
1da177e4 LT |
370 | * else index to encapsulation limit |
371 | **/ | |
372 | ||
373 | static __u16 | |
374 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
375 | { | |
376 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
377 | __u8 nexthdr = ipv6h->nexthdr; | |
378 | __u16 off = sizeof (*ipv6h); | |
379 | ||
380 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
381 | __u16 optlen = 0; | |
382 | struct ipv6_opt_hdr *hdr; | |
383 | if (raw + off + sizeof (*hdr) > skb->data && | |
384 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
385 | break; | |
386 | ||
387 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
388 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
389 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
390 | if (frag_hdr->frag_off) | |
391 | break; | |
392 | optlen = 8; | |
393 | } else if (nexthdr == NEXTHDR_AUTH) { | |
394 | optlen = (hdr->hdrlen + 2) << 2; | |
395 | } else { | |
396 | optlen = ipv6_optlen(hdr); | |
397 | } | |
398 | if (nexthdr == NEXTHDR_DEST) { | |
399 | __u16 i = off + 2; | |
400 | while (1) { | |
401 | struct ipv6_tlv_tnl_enc_lim *tel; | |
402 | ||
403 | /* No more room for encapsulation limit */ | |
404 | if (i + sizeof (*tel) > off + optlen) | |
405 | break; | |
406 | ||
407 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
408 | /* return index of option if found and valid */ | |
409 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
410 | tel->length == 1) | |
411 | return i; | |
412 | /* else jump to next option */ | |
413 | if (tel->type) | |
414 | i += tel->length + 2; | |
415 | else | |
416 | i++; | |
417 | } | |
418 | } | |
419 | nexthdr = hdr->nexthdr; | |
420 | off += optlen; | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
425 | /** | |
e490d1d8 | 426 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
427 | * |
428 | * Description: | |
e490d1d8 | 429 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
430 | * to the specifications in RFC 2473. |
431 | **/ | |
432 | ||
d2acc347 | 433 | static int |
502b0935 | 434 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 435 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 LT |
436 | { |
437 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
438 | struct ip6_tnl *t; | |
439 | int rel_msg = 0; | |
d5fdd6ba BH |
440 | u8 rel_type = ICMPV6_DEST_UNREACH; |
441 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
442 | __u32 rel_info = 0; |
443 | __u16 len; | |
d2acc347 | 444 | int err = -ENOENT; |
1da177e4 | 445 | |
1ab1457c YH |
446 | /* If the packet doesn't contain the original IPv6 header we are |
447 | in trouble since we might need the source address for further | |
1da177e4 LT |
448 | processing of the error. */ |
449 | ||
2922bc8a | 450 | rcu_read_lock(); |
8704ca7e | 451 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 452 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
453 | goto out; |
454 | ||
502b0935 YK |
455 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
456 | goto out; | |
457 | ||
d2acc347 HX |
458 | err = 0; |
459 | ||
e490d1d8 | 460 | switch (*type) { |
1da177e4 LT |
461 | __u32 teli; |
462 | struct ipv6_tlv_tnl_enc_lim *tel; | |
463 | __u32 mtu; | |
464 | case ICMPV6_DEST_UNREACH: | |
465 | if (net_ratelimit()) | |
466 | printk(KERN_WARNING | |
467 | "%s: Path to destination invalid " | |
468 | "or inactive!\n", t->parms.name); | |
469 | rel_msg = 1; | |
470 | break; | |
471 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 472 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
473 | if (net_ratelimit()) |
474 | printk(KERN_WARNING | |
475 | "%s: Too small hop limit or " | |
1ab1457c | 476 | "routing loop in tunnel!\n", |
1da177e4 LT |
477 | t->parms.name); |
478 | rel_msg = 1; | |
479 | } | |
480 | break; | |
481 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 482 | teli = 0; |
e490d1d8 | 483 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 484 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 485 | |
704eae1f | 486 | if (teli && teli == *info - 2) { |
1da177e4 LT |
487 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
488 | if (tel->encap_limit == 0) { | |
489 | if (net_ratelimit()) | |
490 | printk(KERN_WARNING | |
491 | "%s: Too small encapsulation " | |
492 | "limit or routing loop in " | |
493 | "tunnel!\n", t->parms.name); | |
494 | rel_msg = 1; | |
495 | } | |
107a5fe6 VN |
496 | } else if (net_ratelimit()) { |
497 | printk(KERN_WARNING | |
498 | "%s: Recipient unable to parse tunneled " | |
499 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
500 | } |
501 | break; | |
502 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 503 | mtu = *info - offset; |
1da177e4 LT |
504 | if (mtu < IPV6_MIN_MTU) |
505 | mtu = IPV6_MIN_MTU; | |
506 | t->dev->mtu = mtu; | |
507 | ||
cc6cdac0 | 508 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
509 | rel_type = ICMPV6_PKT_TOOBIG; |
510 | rel_code = 0; | |
511 | rel_info = mtu; | |
512 | rel_msg = 1; | |
513 | } | |
514 | break; | |
515 | } | |
e490d1d8 YK |
516 | |
517 | *type = rel_type; | |
518 | *code = rel_code; | |
519 | *info = rel_info; | |
520 | *msg = rel_msg; | |
521 | ||
522 | out: | |
2922bc8a | 523 | rcu_read_unlock(); |
e490d1d8 YK |
524 | return err; |
525 | } | |
526 | ||
c4d3efaf YK |
527 | static int |
528 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 529 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
530 | { |
531 | int rel_msg = 0; | |
d5fdd6ba BH |
532 | u8 rel_type = type; |
533 | u8 rel_code = code; | |
704eae1f | 534 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
535 | int err; |
536 | struct sk_buff *skb2; | |
537 | struct iphdr *eiph; | |
538 | struct flowi fl; | |
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 */ | |
580 | memset(&fl, 0, sizeof(fl)); | |
581 | fl.fl4_dst = eiph->saddr; | |
582 | fl.fl4_tos = RT_TOS(eiph->tos); | |
583 | fl.proto = IPPROTO_IPIP; | |
2f7f54b7 | 584 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) |
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; | |
593 | fl.fl4_dst = eiph->daddr; | |
594 | fl.fl4_src = eiph->saddr; | |
595 | fl.fl4_tos = eiph->tos; | |
2f7f54b7 | 596 | if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || |
d8d1f30b | 597 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
c4d3efaf YK |
598 | ip_rt_put(rt); |
599 | goto out; | |
600 | } | |
adf30907 | 601 | skb_dst_set(skb2, (struct dst_entry *)rt); |
c4d3efaf YK |
602 | } else { |
603 | ip_rt_put(rt); | |
604 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
605 | skb2->dev) || | |
adf30907 | 606 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
607 | goto out; |
608 | } | |
609 | ||
610 | /* change mtu on this route */ | |
611 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 612 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
613 | goto out; |
614 | ||
adf30907 | 615 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
616 | } |
617 | ||
704eae1f | 618 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
619 | |
620 | out: | |
621 | kfree_skb(skb2); | |
622 | return 0; | |
623 | } | |
624 | ||
e490d1d8 YK |
625 | static int |
626 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 627 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
628 | { |
629 | int rel_msg = 0; | |
d5fdd6ba BH |
630 | u8 rel_type = type; |
631 | u8 rel_code = code; | |
704eae1f | 632 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
633 | int err; |
634 | ||
502b0935 YK |
635 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
636 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
637 | if (err < 0) |
638 | return err; | |
639 | ||
640 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
641 | struct rt6_info *rt; |
642 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 643 | |
1da177e4 | 644 | if (!skb2) |
e490d1d8 | 645 | return 0; |
1da177e4 | 646 | |
adf30907 | 647 | skb_dst_drop(skb2); |
1da177e4 | 648 | skb_pull(skb2, offset); |
c1d2bbe1 | 649 | skb_reset_network_header(skb2); |
1da177e4 LT |
650 | |
651 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
652 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
653 | NULL, 0, 0); | |
1da177e4 LT |
654 | |
655 | if (rt && rt->rt6i_dev) | |
656 | skb2->dev = rt->rt6i_dev; | |
657 | ||
3ffe533c | 658 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
659 | |
660 | if (rt) | |
d8d1f30b | 661 | dst_release(&rt->dst); |
1da177e4 LT |
662 | |
663 | kfree_skb(skb2); | |
664 | } | |
e490d1d8 YK |
665 | |
666 | return 0; | |
1da177e4 LT |
667 | } |
668 | ||
c4d3efaf YK |
669 | static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
670 | struct ipv6hdr *ipv6h, | |
671 | struct sk_buff *skb) | |
672 | { | |
673 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
674 | ||
675 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 676 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
677 | |
678 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 679 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
680 | } |
681 | ||
8359925b YK |
682 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
683 | struct ipv6hdr *ipv6h, | |
684 | struct sk_buff *skb) | |
1da177e4 | 685 | { |
8359925b | 686 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 687 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 688 | |
8359925b | 689 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 690 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 691 | } |
8359925b | 692 | |
f1a28eab | 693 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
694 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
695 | { | |
696 | struct ip6_tnl_parm *p = &t->parms; | |
697 | int ret = 0; | |
2f7f54b7 | 698 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
699 | |
700 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 701 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
702 | |
703 | if (p->link) | |
f1a28eab | 704 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
705 | |
706 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
707 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
708 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
709 | ret = 1; |
710 | ||
09c6bbf0 VN |
711 | } |
712 | return ret; | |
713 | } | |
1da177e4 LT |
714 | |
715 | /** | |
3144581c | 716 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 717 | * @skb: received socket buffer |
8359925b YK |
718 | * @protocol: ethernet protocol ID |
719 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
720 | * |
721 | * Return: 0 | |
722 | **/ | |
723 | ||
8359925b | 724 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 725 | __u8 ipproto, |
8359925b YK |
726 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, |
727 | struct ipv6hdr *ipv6h, | |
728 | struct sk_buff *skb)) | |
1da177e4 | 729 | { |
1da177e4 | 730 | struct ip6_tnl *t; |
0660e03f | 731 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 732 | |
2922bc8a | 733 | rcu_read_lock(); |
1da177e4 | 734 | |
8704ca7e | 735 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 736 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
737 | struct pcpu_tstats *tstats; |
738 | ||
502b0935 | 739 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 740 | rcu_read_unlock(); |
502b0935 YK |
741 | goto discard; |
742 | } | |
743 | ||
1da177e4 | 744 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 745 | rcu_read_unlock(); |
50fba2aa | 746 | goto discard; |
1da177e4 LT |
747 | } |
748 | ||
09c6bbf0 | 749 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 750 | t->dev->stats.rx_dropped++; |
2922bc8a | 751 | rcu_read_unlock(); |
1da177e4 LT |
752 | goto discard; |
753 | } | |
754 | secpath_reset(skb); | |
b0e380b1 | 755 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 756 | skb_reset_network_header(skb); |
8359925b | 757 | skb->protocol = htons(protocol); |
1da177e4 LT |
758 | skb->pkt_type = PACKET_HOST; |
759 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 760 | |
8560f226 ED |
761 | tstats = this_cpu_ptr(t->dev->tstats); |
762 | tstats->rx_packets++; | |
763 | tstats->rx_bytes += skb->len; | |
764 | ||
765 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 766 | |
d19d56dd | 767 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 768 | |
caf586e5 | 769 | netif_rx(skb); |
8990f468 | 770 | |
2922bc8a | 771 | rcu_read_unlock(); |
1da177e4 LT |
772 | return 0; |
773 | } | |
2922bc8a | 774 | rcu_read_unlock(); |
1da177e4 | 775 | return 1; |
50fba2aa HX |
776 | |
777 | discard: | |
778 | kfree_skb(skb); | |
779 | return 0; | |
1da177e4 LT |
780 | } |
781 | ||
c4d3efaf YK |
782 | static int ip4ip6_rcv(struct sk_buff *skb) |
783 | { | |
502b0935 YK |
784 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
785 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
786 | } |
787 | ||
8359925b YK |
788 | static int ip6ip6_rcv(struct sk_buff *skb) |
789 | { | |
502b0935 YK |
790 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
791 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
792 | } |
793 | ||
6fb32dde VN |
794 | struct ipv6_tel_txoption { |
795 | struct ipv6_txoptions ops; | |
796 | __u8 dst_opt[8]; | |
797 | }; | |
1da177e4 | 798 | |
6fb32dde VN |
799 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
800 | { | |
801 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 802 | |
6fb32dde VN |
803 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
804 | opt->dst_opt[3] = 1; | |
805 | opt->dst_opt[4] = encap_limit; | |
806 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
807 | opt->dst_opt[6] = 1; | |
1da177e4 | 808 | |
6fb32dde VN |
809 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
810 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
811 | } |
812 | ||
813 | /** | |
3144581c | 814 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 815 | * @t: the outgoing tunnel device |
1ab1457c | 816 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
817 | * |
818 | * Description: | |
1ab1457c | 819 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
820 | * doesn't match source of incoming packet. |
821 | * | |
1ab1457c | 822 | * Return: |
1da177e4 LT |
823 | * 1 if conflict, |
824 | * 0 else | |
825 | **/ | |
826 | ||
827 | static inline int | |
3144581c | 828 | ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) |
1da177e4 LT |
829 | { |
830 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
831 | } | |
832 | ||
09c6bbf0 VN |
833 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
834 | { | |
835 | struct ip6_tnl_parm *p = &t->parms; | |
836 | int ret = 0; | |
2f7f54b7 | 837 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 838 | |
1ab1457c | 839 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
840 | struct net_device *ldev = NULL; |
841 | ||
f1a28eab | 842 | rcu_read_lock(); |
09c6bbf0 | 843 | if (p->link) |
f1a28eab | 844 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 845 | |
2f7f54b7 | 846 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
847 | printk(KERN_WARNING |
848 | "%s xmit: Local address not yet configured!\n", | |
849 | p->name); | |
850 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 851 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
852 | printk(KERN_WARNING |
853 | "%s xmit: Routing loop! " | |
854 | "Remote address found on this node!\n", | |
855 | p->name); | |
856 | else | |
857 | ret = 1; | |
f1a28eab | 858 | rcu_read_unlock(); |
09c6bbf0 VN |
859 | } |
860 | return ret; | |
861 | } | |
1da177e4 | 862 | /** |
61ec2aec | 863 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 864 | * @skb: the outgoing socket buffer |
1ab1457c | 865 | * @dev: the outgoing tunnel device |
61ec2aec YK |
866 | * @dsfield: dscp code for outer header |
867 | * @fl: flow of tunneled packet | |
868 | * @encap_limit: encapsulation limit | |
869 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
870 | * |
871 | * Description: | |
872 | * Build new header and do some sanity checks on the packet before sending | |
873 | * it. | |
874 | * | |
1ab1457c | 875 | * Return: |
c4d3efaf | 876 | * 0 on success |
61ec2aec YK |
877 | * -1 fail |
878 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
879 | **/ |
880 | ||
61ec2aec YK |
881 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
882 | struct net_device *dev, | |
883 | __u8 dsfield, | |
884 | struct flowi *fl, | |
885 | int encap_limit, | |
886 | __u32 *pmtu) | |
1da177e4 | 887 | { |
52479b62 | 888 | struct net *net = dev_net(dev); |
2941a486 | 889 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 890 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 891 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 892 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
893 | struct dst_entry *dst; |
894 | struct net_device *tdev; | |
895 | int mtu; | |
c2636b4d | 896 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 897 | u8 proto; |
61ec2aec | 898 | int err = -1; |
1da177e4 | 899 | int pkt_len; |
1da177e4 | 900 | |
1da177e4 LT |
901 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
902 | dst_hold(dst); | |
a57ebc90 | 903 | else { |
52479b62 | 904 | dst = ip6_route_output(net, NULL, fl); |
1da177e4 | 905 | |
452edd59 | 906 | if (dst->error) |
a57ebc90 | 907 | goto tx_err_link_failure; |
452edd59 DM |
908 | dst = xfrm_lookup(net, dst, fl, NULL, 0); |
909 | if (IS_ERR(dst)) { | |
910 | err = PTR_ERR(dst); | |
911 | dst = NULL; | |
912 | goto tx_err_link_failure; | |
913 | } | |
a57ebc90 | 914 | } |
1da177e4 LT |
915 | |
916 | tdev = dst->dev; | |
917 | ||
918 | if (tdev == dev) { | |
919 | stats->collisions++; | |
920 | if (net_ratelimit()) | |
1ab1457c | 921 | printk(KERN_WARNING |
1da177e4 LT |
922 | "%s: Local routing loop detected!\n", |
923 | t->parms.name); | |
924 | goto tx_err_dst_release; | |
925 | } | |
926 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 927 | if (encap_limit >= 0) { |
1da177e4 LT |
928 | max_headroom += 8; |
929 | mtu -= 8; | |
930 | } | |
931 | if (mtu < IPV6_MIN_MTU) | |
932 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
933 | if (skb_dst(skb)) |
934 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 935 | if (skb->len > mtu) { |
61ec2aec YK |
936 | *pmtu = mtu; |
937 | err = -EMSGSIZE; | |
1da177e4 LT |
938 | goto tx_err_dst_release; |
939 | } | |
940 | ||
941 | /* | |
942 | * Okay, now see if we can stuff it in the buffer as-is. | |
943 | */ | |
944 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 945 | |
cfbba49d PM |
946 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
947 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 948 | struct sk_buff *new_skb; |
1ab1457c | 949 | |
1da177e4 LT |
950 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
951 | goto tx_err_dst_release; | |
952 | ||
953 | if (skb->sk) | |
954 | skb_set_owner_w(new_skb, skb->sk); | |
955 | kfree_skb(skb); | |
956 | skb = new_skb; | |
957 | } | |
adf30907 ED |
958 | skb_dst_drop(skb); |
959 | skb_dst_set(skb, dst_clone(dst)); | |
1da177e4 | 960 | |
b0e380b1 | 961 | skb->transport_header = skb->network_header; |
1da177e4 | 962 | |
61ec2aec | 963 | proto = fl->proto; |
6fb32dde VN |
964 | if (encap_limit >= 0) { |
965 | init_tel_txopt(&opt, encap_limit); | |
966 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
967 | } | |
e2d1bca7 ACM |
968 | skb_push(skb, sizeof(struct ipv6hdr)); |
969 | skb_reset_network_header(skb); | |
0660e03f | 970 | ipv6h = ipv6_hdr(skb); |
61ec2aec | 971 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
972 | dsfield = INET_ECN_encapsulate(0, dsfield); |
973 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
974 | ipv6h->hop_limit = t->parms.hop_limit; |
975 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
976 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
977 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
978 | nf_reset(skb); |
979 | pkt_len = skb->len; | |
ef76bc23 | 980 | err = ip6_local_out(skb); |
1da177e4 | 981 | |
b9df3cb8 | 982 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
983 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
984 | ||
985 | tstats->tx_bytes += pkt_len; | |
986 | tstats->tx_packets++; | |
1da177e4 LT |
987 | } else { |
988 | stats->tx_errors++; | |
989 | stats->tx_aborted_errors++; | |
990 | } | |
991 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
992 | return 0; |
993 | tx_err_link_failure: | |
994 | stats->tx_carrier_errors++; | |
995 | dst_link_failure(skb); | |
996 | tx_err_dst_release: | |
997 | dst_release(dst); | |
61ec2aec YK |
998 | return err; |
999 | } | |
1000 | ||
c4d3efaf YK |
1001 | static inline int |
1002 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1003 | { | |
1004 | struct ip6_tnl *t = netdev_priv(dev); | |
eddc9ec5 | 1005 | struct iphdr *iph = ip_hdr(skb); |
c4d3efaf YK |
1006 | int encap_limit = -1; |
1007 | struct flowi fl; | |
1008 | __u8 dsfield; | |
1009 | __u32 mtu; | |
1010 | int err; | |
1011 | ||
502b0935 YK |
1012 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1013 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1014 | return -1; |
1015 | ||
1016 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1017 | encap_limit = t->parms.encap_limit; | |
1018 | ||
1019 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1020 | fl.proto = IPPROTO_IPIP; | |
1021 | ||
1022 | dsfield = ipv4_get_dsfield(iph); | |
1023 | ||
1024 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
b77f2fa6 AV |
1025 | fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
1026 | & IPV6_TCLASS_MASK; | |
c4d3efaf YK |
1027 | |
1028 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1029 | if (err != 0) { | |
1030 | /* XXX: send ICMP error even if DF is not set. */ | |
1031 | if (err == -EMSGSIZE) | |
1032 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1033 | htonl(mtu)); | |
1034 | return -1; | |
1035 | } | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
61ec2aec YK |
1040 | static inline int |
1041 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1042 | { | |
1043 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1044 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1045 | int encap_limit = -1; |
1046 | __u16 offset; | |
1047 | struct flowi fl; | |
1048 | __u8 dsfield; | |
1049 | __u32 mtu; | |
1050 | int err; | |
1051 | ||
502b0935 YK |
1052 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1053 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1054 | return -1; |
1055 | ||
d56f90a7 ACM |
1056 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1057 | if (offset > 0) { | |
61ec2aec | 1058 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1059 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1060 | if (tel->encap_limit == 0) { |
1061 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1062 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1063 | return -1; |
1064 | } | |
1065 | encap_limit = tel->encap_limit - 1; | |
1066 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1067 | encap_limit = t->parms.encap_limit; | |
1068 | ||
1069 | memcpy(&fl, &t->fl, sizeof (fl)); | |
1070 | fl.proto = IPPROTO_IPV6; | |
1071 | ||
1072 | dsfield = ipv6_get_dsfield(ipv6h); | |
1073 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
1074 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
1075 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1076 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
1077 | ||
1078 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
1079 | if (err != 0) { | |
1080 | if (err == -EMSGSIZE) | |
3ffe533c | 1081 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1082 | return -1; |
1083 | } | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
6fef4c0c | 1088 | static netdev_tx_t |
61ec2aec YK |
1089 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1090 | { | |
1091 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1092 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1093 | int ret; |
1094 | ||
61ec2aec | 1095 | switch (skb->protocol) { |
60678040 | 1096 | case htons(ETH_P_IP): |
c4d3efaf YK |
1097 | ret = ip4ip6_tnl_xmit(skb, dev); |
1098 | break; | |
60678040 | 1099 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1100 | ret = ip6ip6_tnl_xmit(skb, dev); |
1101 | break; | |
1102 | default: | |
1103 | goto tx_err; | |
1104 | } | |
1105 | ||
1106 | if (ret < 0) | |
1107 | goto tx_err; | |
1108 | ||
6ed10654 | 1109 | return NETDEV_TX_OK; |
61ec2aec | 1110 | |
1da177e4 LT |
1111 | tx_err: |
1112 | stats->tx_errors++; | |
1113 | stats->tx_dropped++; | |
1114 | kfree_skb(skb); | |
6ed10654 | 1115 | return NETDEV_TX_OK; |
1da177e4 LT |
1116 | } |
1117 | ||
1118 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1119 | { | |
1120 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1121 | int ltype = ipv6_addr_type(&p->laddr); |
1122 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1123 | |
1124 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1125 | ||
09c6bbf0 VN |
1126 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1127 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1128 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1129 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1130 | if (ltype&IPV6_ADDR_UNICAST) |
1131 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1132 | if (rtype&IPV6_ADDR_UNICAST) | |
1133 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1134 | } |
1135 | } | |
1136 | ||
3144581c | 1137 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1138 | { |
1139 | struct net_device *dev = t->dev; | |
1140 | struct ip6_tnl_parm *p = &t->parms; | |
1141 | struct flowi *fl = &t->fl; | |
1142 | ||
3a6d54c5 JP |
1143 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1144 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1145 | |
1146 | /* Set up flowi template */ | |
1147 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
1148 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
1149 | fl->oif = p->link; | |
1150 | fl->fl6_flowlabel = 0; | |
1151 | ||
1152 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1153 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1154 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1155 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1156 | ||
1157 | ip6_tnl_set_cap(t); | |
1158 | ||
1159 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1160 | dev->flags |= IFF_POINTOPOINT; | |
1161 | else | |
1162 | dev->flags &= ~IFF_POINTOPOINT; | |
1163 | ||
1164 | dev->iflink = p->link; | |
1165 | ||
1166 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1167 | int strict = (ipv6_addr_type(&p->raddr) & |
1168 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1169 | ||
2f7f54b7 PE |
1170 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1171 | &p->raddr, &p->laddr, | |
305d4b3c | 1172 | p->link, strict); |
1da177e4 LT |
1173 | |
1174 | if (rt == NULL) | |
1175 | return; | |
1176 | ||
1177 | if (rt->rt6i_dev) { | |
1178 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
1179 | sizeof (struct ipv6hdr); | |
1180 | ||
1181 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
381601e5 AF |
1182 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1183 | dev->mtu-=8; | |
1da177e4 LT |
1184 | |
1185 | if (dev->mtu < IPV6_MIN_MTU) | |
1186 | dev->mtu = IPV6_MIN_MTU; | |
1187 | } | |
d8d1f30b | 1188 | dst_release(&rt->dst); |
1da177e4 LT |
1189 | } |
1190 | } | |
1191 | ||
1192 | /** | |
3144581c | 1193 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1194 | * @t: tunnel to be changed |
1195 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1196 | * |
1197 | * Description: | |
3144581c | 1198 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1199 | **/ |
1200 | ||
1201 | static int | |
3144581c | 1202 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 LT |
1203 | { |
1204 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
1205 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
1206 | t->parms.flags = p->flags; | |
1207 | t->parms.hop_limit = p->hop_limit; | |
1208 | t->parms.encap_limit = p->encap_limit; | |
1209 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1210 | t->parms.link = p->link; |
502b0935 | 1211 | t->parms.proto = p->proto; |
0c088890 | 1212 | ip6_tnl_dst_reset(t); |
3144581c | 1213 | ip6_tnl_link_config(t); |
1da177e4 LT |
1214 | return 0; |
1215 | } | |
1216 | ||
1217 | /** | |
3144581c | 1218 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1219 | * @dev: virtual device associated with tunnel |
1220 | * @ifr: parameters passed from userspace | |
1221 | * @cmd: command to be performed | |
1222 | * | |
1223 | * Description: | |
3144581c | 1224 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1225 | * from userspace. |
1da177e4 LT |
1226 | * |
1227 | * The possible commands are the following: | |
1228 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1229 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1230 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1231 | * %SIOCDELTUNNEL: delete tunnel | |
1232 | * | |
1ab1457c | 1233 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1234 | * initialization, can be used for creating other tunnel devices. |
1235 | * | |
1236 | * Return: | |
1237 | * 0 on success, | |
1238 | * %-EFAULT if unable to copy data to or from userspace, | |
1239 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1240 | * %-EINVAL if passed tunnel parameters are invalid, | |
1241 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1242 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1243 | **/ | |
1244 | ||
1245 | static int | |
3144581c | 1246 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1247 | { |
1248 | int err = 0; | |
1da177e4 LT |
1249 | struct ip6_tnl_parm p; |
1250 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1251 | struct net *net = dev_net(dev); |
1252 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1253 | |
1254 | switch (cmd) { | |
1255 | case SIOCGETTUNNEL: | |
15820e12 | 1256 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1257 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1258 | err = -EFAULT; |
1259 | break; | |
1260 | } | |
2dd02c89 | 1261 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1262 | } |
1263 | if (t == NULL) | |
2941a486 | 1264 | t = netdev_priv(dev); |
1da177e4 LT |
1265 | memcpy(&p, &t->parms, sizeof (p)); |
1266 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1267 | err = -EFAULT; | |
1268 | } | |
1269 | break; | |
1270 | case SIOCADDTUNNEL: | |
1271 | case SIOCCHGTUNNEL: | |
1272 | err = -EPERM; | |
1da177e4 LT |
1273 | if (!capable(CAP_NET_ADMIN)) |
1274 | break; | |
567131a7 VN |
1275 | err = -EFAULT; |
1276 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1277 | break; |
567131a7 | 1278 | err = -EINVAL; |
502b0935 YK |
1279 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1280 | p.proto != 0) | |
1da177e4 | 1281 | break; |
2dd02c89 | 1282 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1283 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1284 | if (t != NULL) { |
1285 | if (t->dev != dev) { | |
1286 | err = -EEXIST; | |
1287 | break; | |
1288 | } | |
1289 | } else | |
1290 | t = netdev_priv(dev); | |
1291 | ||
2dd02c89 | 1292 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1293 | synchronize_net(); |
3144581c | 1294 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1295 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1296 | netdev_state_change(dev); |
1297 | } | |
567131a7 | 1298 | if (t) { |
1da177e4 | 1299 | err = 0; |
567131a7 VN |
1300 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1301 | err = -EFAULT; | |
1302 | ||
1303 | } else | |
1304 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1305 | break; |
1306 | case SIOCDELTUNNEL: | |
1307 | err = -EPERM; | |
1308 | if (!capable(CAP_NET_ADMIN)) | |
1309 | break; | |
1310 | ||
15820e12 | 1311 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1312 | err = -EFAULT; |
1313 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1314 | break; |
567131a7 | 1315 | err = -ENOENT; |
2dd02c89 | 1316 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1317 | break; |
567131a7 | 1318 | err = -EPERM; |
15820e12 | 1319 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1320 | break; |
567131a7 | 1321 | dev = t->dev; |
1da177e4 | 1322 | } |
22f8cde5 SH |
1323 | err = 0; |
1324 | unregister_netdevice(dev); | |
1da177e4 LT |
1325 | break; |
1326 | default: | |
1327 | err = -EINVAL; | |
1328 | } | |
1329 | return err; | |
1330 | } | |
1331 | ||
1da177e4 | 1332 | /** |
3144581c | 1333 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1334 | * @dev: virtual device associated with tunnel |
1335 | * @new_mtu: the new mtu | |
1336 | * | |
1337 | * Return: | |
1338 | * 0 on success, | |
1339 | * %-EINVAL if mtu too small | |
1340 | **/ | |
1341 | ||
1342 | static int | |
3144581c | 1343 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1344 | { |
1345 | if (new_mtu < IPV6_MIN_MTU) { | |
1346 | return -EINVAL; | |
1347 | } | |
1348 | dev->mtu = new_mtu; | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1326c3d5 SH |
1352 | |
1353 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1354 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1355 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1356 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1357 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1358 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1359 | }; |
1360 | ||
8560f226 | 1361 | |
1da177e4 | 1362 | /** |
3144581c | 1363 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1364 | * @dev: virtual device associated with tunnel |
1365 | * | |
1366 | * Description: | |
1367 | * Initialize function pointers and device parameters | |
1368 | **/ | |
1369 | ||
3144581c | 1370 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1371 | { |
381601e5 AF |
1372 | struct ip6_tnl *t; |
1373 | ||
1326c3d5 | 1374 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1375 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1376 | |
1377 | dev->type = ARPHRD_TUNNEL6; | |
1378 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1379 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1380 | t = netdev_priv(dev); |
1381 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1382 | dev->mtu-=8; | |
1da177e4 LT |
1383 | dev->flags |= IFF_NOARP; |
1384 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1385 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1386 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | ||
1390 | /** | |
3144581c | 1391 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1392 | * @dev: virtual device associated with tunnel |
1393 | **/ | |
1394 | ||
8560f226 | 1395 | static inline int |
3144581c | 1396 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1397 | { |
2941a486 | 1398 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1399 | |
1da177e4 LT |
1400 | t->dev = dev; |
1401 | strcpy(t->parms.name, dev->name); | |
8560f226 ED |
1402 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1403 | if (!dev->tstats) | |
1404 | return -ENOMEM; | |
1405 | return 0; | |
1da177e4 LT |
1406 | } |
1407 | ||
1408 | /** | |
3144581c | 1409 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1410 | * @dev: virtual device associated with tunnel |
1411 | **/ | |
1412 | ||
8560f226 | 1413 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1414 | { |
2941a486 | 1415 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1416 | int err = ip6_tnl_dev_init_gen(dev); |
1417 | ||
1418 | if (err) | |
1419 | return err; | |
3144581c | 1420 | ip6_tnl_link_config(t); |
8560f226 | 1421 | return 0; |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | /** | |
3144581c | 1425 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1426 | * @dev: fallback device |
1427 | * | |
1428 | * Return: 0 | |
1429 | **/ | |
1430 | ||
8560f226 | 1431 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1432 | { |
2941a486 | 1433 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1434 | struct net *net = dev_net(dev); |
1435 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1436 | int err = ip6_tnl_dev_init_gen(dev); |
1437 | ||
1438 | if (err) | |
1439 | return err; | |
3e6c9fb5 | 1440 | |
502b0935 | 1441 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1442 | dev_hold(dev); |
94767632 | 1443 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1444 | return 0; |
1da177e4 LT |
1445 | } |
1446 | ||
3ff2cfa5 | 1447 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1448 | .handler = ip4ip6_rcv, |
1449 | .err_handler = ip4ip6_err, | |
1450 | .priority = 1, | |
1451 | }; | |
1452 | ||
3ff2cfa5 | 1453 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1454 | .handler = ip6ip6_rcv, |
1455 | .err_handler = ip6ip6_err, | |
d2acc347 | 1456 | .priority = 1, |
1da177e4 LT |
1457 | }; |
1458 | ||
2c8c1e72 | 1459 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1460 | { |
1461 | int h; | |
1462 | struct ip6_tnl *t; | |
cf4432f5 | 1463 | LIST_HEAD(list); |
3e6c9fb5 PE |
1464 | |
1465 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1466 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1467 | while (t != NULL) { |
1468 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1469 | t = rtnl_dereference(t->next); |
cf4432f5 | 1470 | } |
3e6c9fb5 PE |
1471 | } |
1472 | ||
94767632 | 1473 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1474 | unregister_netdevice_queue(t->dev, &list); |
1475 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1476 | } |
1477 | ||
2c8c1e72 | 1478 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1479 | { |
ac31cd3c | 1480 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1481 | int err; |
13eeb8e9 | 1482 | |
3e6c9fb5 PE |
1483 | ip6n->tnls[0] = ip6n->tnls_wc; |
1484 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1485 | ||
15820e12 PE |
1486 | err = -ENOMEM; |
1487 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1488 | ip6_tnl_dev_setup); | |
1489 | ||
1490 | if (!ip6n->fb_tnl_dev) | |
1491 | goto err_alloc_dev; | |
be77e593 | 1492 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1493 | |
8560f226 ED |
1494 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1495 | if (err < 0) | |
1496 | goto err_register; | |
15820e12 PE |
1497 | |
1498 | err = register_netdev(ip6n->fb_tnl_dev); | |
1499 | if (err < 0) | |
1500 | goto err_register; | |
13eeb8e9 PE |
1501 | return 0; |
1502 | ||
15820e12 | 1503 | err_register: |
8560f226 | 1504 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1505 | err_alloc_dev: |
13eeb8e9 PE |
1506 | return err; |
1507 | } | |
1508 | ||
2c8c1e72 | 1509 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1510 | { |
ac31cd3c | 1511 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1512 | |
3e6c9fb5 PE |
1513 | rtnl_lock(); |
1514 | ip6_tnl_destroy_tunnels(ip6n); | |
1515 | rtnl_unlock(); | |
13eeb8e9 PE |
1516 | } |
1517 | ||
1518 | static struct pernet_operations ip6_tnl_net_ops = { | |
1519 | .init = ip6_tnl_init_net, | |
1520 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1521 | .id = &ip6_tnl_net_id, |
1522 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1523 | }; |
1524 | ||
1da177e4 LT |
1525 | /** |
1526 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1527 | * | |
1528 | * Return: 0 on success | |
1529 | **/ | |
1530 | ||
1531 | static int __init ip6_tunnel_init(void) | |
1532 | { | |
1533 | int err; | |
1534 | ||
d5aa407f AD |
1535 | err = register_pernet_device(&ip6_tnl_net_ops); |
1536 | if (err < 0) | |
1537 | goto out_pernet; | |
1538 | ||
1539 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1540 | if (err < 0) { | |
3144581c | 1541 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1542 | goto out_ip4ip6; |
c4d3efaf YK |
1543 | } |
1544 | ||
d5aa407f AD |
1545 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1546 | if (err < 0) { | |
3144581c | 1547 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1548 | goto out_ip6ip6; |
1da177e4 | 1549 | } |
13eeb8e9 | 1550 | |
1da177e4 | 1551 | return 0; |
d5aa407f AD |
1552 | |
1553 | out_ip6ip6: | |
c4d3efaf | 1554 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1555 | out_ip4ip6: |
1556 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1557 | out_pernet: | |
1da177e4 LT |
1558 | return err; |
1559 | } | |
1560 | ||
1561 | /** | |
1562 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1563 | **/ | |
1564 | ||
1565 | static void __exit ip6_tunnel_cleanup(void) | |
1566 | { | |
c4d3efaf | 1567 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1568 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1569 | |
73d605d1 | 1570 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1571 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1572 | |
ac31cd3c | 1573 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1574 | } |
1575 | ||
1576 | module_init(ip6_tunnel_init); | |
1577 | module_exit(ip6_tunnel_cleanup); |