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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 | ||
f3213831 JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/if_tunnel.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/in6.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/if_arp.h> | |
37 | #include <linux/icmpv6.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/route.h> | |
40 | #include <linux/rtnetlink.h> | |
41 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
ddbe5032 | 43 | #include <linux/hash.h> |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
60063497 | 46 | #include <linux/atomic.h> |
1da177e4 | 47 | |
c4d3efaf | 48 | #include <net/icmp.h> |
1da177e4 LT |
49 | #include <net/ip.h> |
50 | #include <net/ipv6.h> | |
1da177e4 LT |
51 | #include <net/ip6_route.h> |
52 | #include <net/addrconf.h> | |
53 | #include <net/ip6_tunnel.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
56 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
57 | #include <net/net_namespace.h> |
58 | #include <net/netns/generic.h> | |
1da177e4 LT |
59 | |
60 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 61 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 62 | MODULE_LICENSE("GPL"); |
6dfbd87a | 63 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 64 | |
1da177e4 | 65 | #ifdef IP6_TNL_DEBUG |
91df42be | 66 | #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__) |
1da177e4 LT |
67 | #else |
68 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
69 | #endif | |
70 | ||
71 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 72 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 | 73 | |
ddbe5032 ED |
74 | #define HASH_SIZE_SHIFT 5 |
75 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 76 | |
ddbe5032 ED |
77 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
78 | { | |
79 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
80 | ||
81 | return hash_32(hash, HASH_SIZE_SHIFT); | |
82 | } | |
1da177e4 | 83 | |
8560f226 | 84 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 85 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 86 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 87 | |
f99189b1 | 88 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 89 | struct ip6_tnl_net { |
15820e12 PE |
90 | /* the IPv6 tunnel fallback device */ |
91 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 92 | /* lists for storing tunnels in use */ |
94767632 ED |
93 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
94 | struct ip6_tnl __rcu *tnls_wc[1]; | |
95 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
96 | }; |
97 | ||
8560f226 ED |
98 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
99 | { | |
100 | struct pcpu_tstats sum = { 0 }; | |
101 | int i; | |
102 | ||
103 | for_each_possible_cpu(i) { | |
104 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
105 | ||
106 | sum.rx_packets += tstats->rx_packets; | |
107 | sum.rx_bytes += tstats->rx_bytes; | |
108 | sum.tx_packets += tstats->tx_packets; | |
109 | sum.tx_bytes += tstats->tx_bytes; | |
110 | } | |
111 | dev->stats.rx_packets = sum.rx_packets; | |
112 | dev->stats.rx_bytes = sum.rx_bytes; | |
113 | dev->stats.tx_packets = sum.tx_packets; | |
114 | dev->stats.tx_bytes = sum.tx_bytes; | |
115 | return &dev->stats; | |
116 | } | |
117 | ||
2922bc8a | 118 | /* |
94767632 | 119 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 120 | */ |
1da177e4 | 121 | |
c12b395a | 122 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
123 | { |
124 | struct dst_entry *dst = t->dst_cache; | |
125 | ||
1ab1457c | 126 | if (dst && dst->obsolete && |
1da177e4 LT |
127 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
128 | t->dst_cache = NULL; | |
129 | dst_release(dst); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | return dst; | |
134 | } | |
c12b395a | 135 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 136 | |
c12b395a | 137 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
138 | { |
139 | dst_release(t->dst_cache); | |
140 | t->dst_cache = NULL; | |
141 | } | |
c12b395a | 142 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 143 | |
c12b395a | 144 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
145 | { |
146 | struct rt6_info *rt = (struct rt6_info *) dst; | |
147 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
148 | dst_release(t->dst_cache); | |
149 | t->dst_cache = dst; | |
150 | } | |
c12b395a | 151 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
152 | |
153 | /** | |
3144581c | 154 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
155 | * @remote: the address of the tunnel exit-point |
156 | * @local: the address of the tunnel entry-point | |
1da177e4 | 157 | * |
1ab1457c | 158 | * Return: |
1da177e4 | 159 | * tunnel matching given end-points if found, |
1ab1457c | 160 | * else fallback tunnel if its device is up, |
1da177e4 LT |
161 | * else %NULL |
162 | **/ | |
163 | ||
2922bc8a ED |
164 | #define for_each_ip6_tunnel_rcu(start) \ |
165 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
166 | ||
1da177e4 | 167 | static struct ip6_tnl * |
b71d1d42 | 168 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 169 | { |
ddbe5032 | 170 | unsigned int hash = HASH(remote, local); |
1da177e4 | 171 | struct ip6_tnl *t; |
3e6c9fb5 | 172 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 173 | |
ddbe5032 | 174 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
175 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
176 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
177 | (t->dev->flags & IFF_UP)) | |
178 | return t; | |
179 | } | |
2922bc8a ED |
180 | t = rcu_dereference(ip6n->tnls_wc[0]); |
181 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
182 | return t; |
183 | ||
184 | return NULL; | |
185 | } | |
186 | ||
187 | /** | |
3144581c | 188 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 189 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
190 | * |
191 | * Description: | |
3144581c | 192 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
193 | * &struct in6_addr entries laddr and raddr in @p. |
194 | * | |
1ab1457c | 195 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
196 | **/ |
197 | ||
94767632 | 198 | static struct ip6_tnl __rcu ** |
c12b395a | 199 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 200 | { |
b71d1d42 ED |
201 | const struct in6_addr *remote = &p->raddr; |
202 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 203 | unsigned int h = 0; |
1da177e4 LT |
204 | int prio = 0; |
205 | ||
206 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
207 | prio = 1; | |
ddbe5032 | 208 | h = HASH(remote, local); |
1da177e4 | 209 | } |
3e6c9fb5 | 210 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
211 | } |
212 | ||
213 | /** | |
3144581c | 214 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
215 | * @t: tunnel to be added |
216 | **/ | |
217 | ||
218 | static void | |
2dd02c89 | 219 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 220 | { |
94767632 | 221 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 222 | |
cf778b00 ED |
223 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
224 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
225 | } |
226 | ||
227 | /** | |
3144581c | 228 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
229 | * @t: tunnel to be removed |
230 | **/ | |
231 | ||
232 | static void | |
2dd02c89 | 233 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 234 | { |
94767632 ED |
235 | struct ip6_tnl __rcu **tp; |
236 | struct ip6_tnl *iter; | |
237 | ||
238 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
239 | (iter = rtnl_dereference(*tp)) != NULL; | |
240 | tp = &iter->next) { | |
241 | if (t == iter) { | |
cf778b00 | 242 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
243 | break; |
244 | } | |
245 | } | |
246 | } | |
247 | ||
8560f226 ED |
248 | static void ip6_dev_free(struct net_device *dev) |
249 | { | |
250 | free_percpu(dev->tstats); | |
251 | free_netdev(dev); | |
252 | } | |
253 | ||
1da177e4 | 254 | /** |
2c53040f | 255 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
256 | * @p: tunnel parameters |
257 | * @pt: pointer to new tunnel | |
258 | * | |
259 | * Description: | |
260 | * Create tunnel matching given parameters. | |
1ab1457c YH |
261 | * |
262 | * Return: | |
567131a7 | 263 | * created tunnel or NULL |
1da177e4 LT |
264 | **/ |
265 | ||
c12b395a | 266 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
267 | { |
268 | struct net_device *dev; | |
269 | struct ip6_tnl *t; | |
270 | char name[IFNAMSIZ]; | |
271 | int err; | |
2dd02c89 | 272 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 273 | |
34cc7ba6 | 274 | if (p->name[0]) |
1da177e4 | 275 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
276 | else |
277 | sprintf(name, "ip6tnl%%d"); | |
278 | ||
3144581c | 279 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 280 | if (dev == NULL) |
567131a7 | 281 | goto failed; |
1da177e4 | 282 | |
554eb277 PE |
283 | dev_net_set(dev, net); |
284 | ||
2941a486 | 285 | t = netdev_priv(dev); |
1da177e4 | 286 | t->parms = *p; |
8560f226 ED |
287 | err = ip6_tnl_dev_init(dev); |
288 | if (err < 0) | |
289 | goto failed_free; | |
1da177e4 | 290 | |
b37d428b PE |
291 | if ((err = register_netdevice(dev)) < 0) |
292 | goto failed_free; | |
293 | ||
731abb9c | 294 | strcpy(t->parms.name, dev->name); |
c075b130 | 295 | dev->rtnl_link_ops = &ip6_link_ops; |
731abb9c | 296 | |
1da177e4 | 297 | dev_hold(dev); |
2dd02c89 | 298 | ip6_tnl_link(ip6n, t); |
567131a7 | 299 | return t; |
b37d428b PE |
300 | |
301 | failed_free: | |
8560f226 | 302 | ip6_dev_free(dev); |
567131a7 VN |
303 | failed: |
304 | return NULL; | |
1da177e4 LT |
305 | } |
306 | ||
307 | /** | |
3144581c | 308 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 309 | * @p: tunnel parameters |
1da177e4 LT |
310 | * @create: != 0 if allowed to create new tunnel if no match found |
311 | * | |
312 | * Description: | |
3144581c | 313 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
314 | * based on @parms. If this is unsuccessful, but @create is set a new |
315 | * tunnel device is created and registered for use. | |
316 | * | |
317 | * Return: | |
567131a7 | 318 | * matching tunnel or NULL |
1da177e4 LT |
319 | **/ |
320 | ||
2dd02c89 | 321 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 322 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 323 | { |
b71d1d42 ED |
324 | const struct in6_addr *remote = &p->raddr; |
325 | const struct in6_addr *local = &p->laddr; | |
94767632 | 326 | struct ip6_tnl __rcu **tp; |
1da177e4 | 327 | struct ip6_tnl *t; |
2dd02c89 | 328 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 329 | |
94767632 ED |
330 | for (tp = ip6_tnl_bucket(ip6n, p); |
331 | (t = rtnl_dereference(*tp)) != NULL; | |
332 | tp = &t->next) { | |
1da177e4 | 333 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
334 | ipv6_addr_equal(remote, &t->parms.raddr)) |
335 | return t; | |
1da177e4 LT |
336 | } |
337 | if (!create) | |
567131a7 | 338 | return NULL; |
2dd02c89 | 339 | return ip6_tnl_create(net, p); |
1da177e4 LT |
340 | } |
341 | ||
342 | /** | |
3144581c | 343 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 344 | * @dev: the device to be destroyed |
1ab1457c | 345 | * |
1da177e4 | 346 | * Description: |
3144581c | 347 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
348 | **/ |
349 | ||
350 | static void | |
3144581c | 351 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 352 | { |
2941a486 | 353 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
354 | struct net *net = dev_net(dev); |
355 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 356 | |
94767632 | 357 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 358 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 359 | else |
2dd02c89 | 360 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
361 | ip6_tnl_dst_reset(t); |
362 | dev_put(dev); | |
363 | } | |
364 | ||
365 | /** | |
366 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
367 | * @skb: received socket buffer | |
368 | * | |
1ab1457c YH |
369 | * Return: |
370 | * 0 if none was found, | |
1da177e4 LT |
371 | * else index to encapsulation limit |
372 | **/ | |
373 | ||
c12b395a | 374 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 375 | { |
b71d1d42 | 376 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
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 | } | |
c12b395a | 424 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
425 | |
426 | /** | |
e490d1d8 | 427 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
428 | * |
429 | * Description: | |
e490d1d8 | 430 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
431 | * to the specifications in RFC 2473. |
432 | **/ | |
433 | ||
d2acc347 | 434 | static int |
502b0935 | 435 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 436 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 437 | { |
b71d1d42 | 438 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
439 | struct ip6_tnl *t; |
440 | int rel_msg = 0; | |
d5fdd6ba BH |
441 | u8 rel_type = ICMPV6_DEST_UNREACH; |
442 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
443 | __u32 rel_info = 0; |
444 | __u16 len; | |
d2acc347 | 445 | int err = -ENOENT; |
1da177e4 | 446 | |
1ab1457c YH |
447 | /* If the packet doesn't contain the original IPv6 header we are |
448 | in trouble since we might need the source address for further | |
1da177e4 LT |
449 | processing of the error. */ |
450 | ||
2922bc8a | 451 | rcu_read_lock(); |
8704ca7e | 452 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 453 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
454 | goto out; |
455 | ||
502b0935 YK |
456 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
457 | goto out; | |
458 | ||
d2acc347 HX |
459 | err = 0; |
460 | ||
e490d1d8 | 461 | switch (*type) { |
1da177e4 LT |
462 | __u32 teli; |
463 | struct ipv6_tlv_tnl_enc_lim *tel; | |
464 | __u32 mtu; | |
465 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
466 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
467 | t->parms.name); | |
1da177e4 LT |
468 | rel_msg = 1; |
469 | break; | |
470 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 471 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
472 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
473 | t->parms.name); | |
1da177e4 LT |
474 | rel_msg = 1; |
475 | } | |
476 | break; | |
477 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 478 | teli = 0; |
e490d1d8 | 479 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 480 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 481 | |
704eae1f | 482 | if (teli && teli == *info - 2) { |
1da177e4 LT |
483 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
484 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
485 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
486 | t->parms.name); | |
1da177e4 LT |
487 | rel_msg = 1; |
488 | } | |
e87cc472 JP |
489 | } else { |
490 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
491 | t->parms.name); | |
1da177e4 LT |
492 | } |
493 | break; | |
494 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 495 | mtu = *info - offset; |
1da177e4 LT |
496 | if (mtu < IPV6_MIN_MTU) |
497 | mtu = IPV6_MIN_MTU; | |
498 | t->dev->mtu = mtu; | |
499 | ||
cc6cdac0 | 500 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
501 | rel_type = ICMPV6_PKT_TOOBIG; |
502 | rel_code = 0; | |
503 | rel_info = mtu; | |
504 | rel_msg = 1; | |
505 | } | |
506 | break; | |
507 | } | |
e490d1d8 YK |
508 | |
509 | *type = rel_type; | |
510 | *code = rel_code; | |
511 | *info = rel_info; | |
512 | *msg = rel_msg; | |
513 | ||
514 | out: | |
2922bc8a | 515 | rcu_read_unlock(); |
e490d1d8 YK |
516 | return err; |
517 | } | |
518 | ||
c4d3efaf YK |
519 | static int |
520 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 521 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
522 | { |
523 | int rel_msg = 0; | |
d5fdd6ba BH |
524 | u8 rel_type = type; |
525 | u8 rel_code = code; | |
704eae1f | 526 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
527 | int err; |
528 | struct sk_buff *skb2; | |
b71d1d42 | 529 | const struct iphdr *eiph; |
c4d3efaf | 530 | struct rtable *rt; |
31e4543d | 531 | struct flowi4 fl4; |
c4d3efaf | 532 | |
502b0935 YK |
533 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
534 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
535 | if (err < 0) |
536 | return err; | |
537 | ||
538 | if (rel_msg == 0) | |
539 | return 0; | |
540 | ||
541 | switch (rel_type) { | |
542 | case ICMPV6_DEST_UNREACH: | |
543 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
544 | return 0; | |
545 | rel_type = ICMP_DEST_UNREACH; | |
546 | rel_code = ICMP_HOST_UNREACH; | |
547 | break; | |
548 | case ICMPV6_PKT_TOOBIG: | |
549 | if (rel_code != 0) | |
550 | return 0; | |
551 | rel_type = ICMP_DEST_UNREACH; | |
552 | rel_code = ICMP_FRAG_NEEDED; | |
553 | break; | |
ec18d9a2 DM |
554 | case NDISC_REDIRECT: |
555 | rel_type = ICMP_REDIRECT; | |
556 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
557 | default: |
558 | return 0; | |
559 | } | |
560 | ||
561 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
562 | return 0; | |
563 | ||
564 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
565 | if (!skb2) | |
566 | return 0; | |
567 | ||
adf30907 ED |
568 | skb_dst_drop(skb2); |
569 | ||
c4d3efaf | 570 | skb_pull(skb2, offset); |
c1d2bbe1 | 571 | skb_reset_network_header(skb2); |
eddc9ec5 | 572 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
573 | |
574 | /* Try to guess incoming interface */ | |
31e4543d | 575 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
576 | eiph->saddr, 0, |
577 | 0, 0, | |
578 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 579 | if (IS_ERR(rt)) |
c4d3efaf YK |
580 | goto out; |
581 | ||
d8d1f30b | 582 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
583 | |
584 | /* route "incoming" packet */ | |
585 | if (rt->rt_flags & RTCF_LOCAL) { | |
586 | ip_rt_put(rt); | |
587 | rt = NULL; | |
31e4543d | 588 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
589 | eiph->daddr, eiph->saddr, |
590 | 0, 0, | |
591 | IPPROTO_IPIP, | |
592 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 593 | if (IS_ERR(rt) || |
d8d1f30b | 594 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
595 | if (!IS_ERR(rt)) |
596 | ip_rt_put(rt); | |
c4d3efaf YK |
597 | goto out; |
598 | } | |
b23dd4fe | 599 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
600 | } else { |
601 | ip_rt_put(rt); | |
602 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
603 | skb2->dev) || | |
adf30907 | 604 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
605 | goto out; |
606 | } | |
607 | ||
608 | /* change mtu on this route */ | |
609 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 610 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
611 | goto out; |
612 | ||
6700c270 | 613 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 614 | } |
1ed5c48f | 615 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 616 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 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 | 654 | |
d1918542 DM |
655 | if (rt && rt->dst.dev) |
656 | skb2->dev = rt->dst.dev; | |
1da177e4 | 657 | |
3ffe533c | 658 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 659 | |
94e187c0 | 660 | ip6_rt_put(rt); |
1da177e4 LT |
661 | |
662 | kfree_skb(skb2); | |
663 | } | |
e490d1d8 YK |
664 | |
665 | return 0; | |
1da177e4 LT |
666 | } |
667 | ||
b71d1d42 ED |
668 | static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
669 | const struct ipv6hdr *ipv6h, | |
c4d3efaf YK |
670 | struct sk_buff *skb) |
671 | { | |
672 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
673 | ||
674 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 675 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
676 | |
677 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 678 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
679 | } |
680 | ||
b71d1d42 ED |
681 | static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
682 | const struct ipv6hdr *ipv6h, | |
8359925b | 683 | struct sk_buff *skb) |
1da177e4 | 684 | { |
8359925b | 685 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 686 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 687 | |
8359925b | 688 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 689 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 690 | } |
8359925b | 691 | |
c12b395a | 692 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
693 | const struct in6_addr *laddr, |
694 | const struct in6_addr *raddr) | |
695 | { | |
c12b395a | 696 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
697 | int ltype = ipv6_addr_type(laddr); |
698 | int rtype = ipv6_addr_type(raddr); | |
699 | __u32 flags = 0; | |
700 | ||
701 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
702 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
703 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
704 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
705 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
706 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
707 | if (ltype&IPV6_ADDR_UNICAST) | |
708 | flags |= IP6_TNL_F_CAP_XMIT; | |
709 | if (rtype&IPV6_ADDR_UNICAST) | |
710 | flags |= IP6_TNL_F_CAP_RCV; | |
711 | } | |
712 | return flags; | |
713 | } | |
c12b395a | 714 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 715 | |
f1a28eab | 716 | /* called with rcu_read_lock() */ |
c12b395a | 717 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
718 | const struct in6_addr *laddr, |
719 | const struct in6_addr *raddr) | |
09c6bbf0 | 720 | { |
c12b395a | 721 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 722 | int ret = 0; |
2f7f54b7 | 723 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 724 | |
d0087b29 VN |
725 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
726 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
727 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 728 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
729 | |
730 | if (p->link) | |
f1a28eab | 731 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 732 | |
d0087b29 VN |
733 | if ((ipv6_addr_is_multicast(laddr) || |
734 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
735 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 736 | ret = 1; |
09c6bbf0 VN |
737 | } |
738 | return ret; | |
739 | } | |
c12b395a | 740 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
741 | |
742 | /** | |
3144581c | 743 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 744 | * @skb: received socket buffer |
8359925b YK |
745 | * @protocol: ethernet protocol ID |
746 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
747 | * |
748 | * Return: 0 | |
749 | **/ | |
750 | ||
8359925b | 751 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 752 | __u8 ipproto, |
b71d1d42 ED |
753 | void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
754 | const struct ipv6hdr *ipv6h, | |
8359925b | 755 | struct sk_buff *skb)) |
1da177e4 | 756 | { |
1da177e4 | 757 | struct ip6_tnl *t; |
b71d1d42 | 758 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 759 | |
2922bc8a | 760 | rcu_read_lock(); |
1da177e4 | 761 | |
8704ca7e | 762 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 763 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
764 | struct pcpu_tstats *tstats; |
765 | ||
502b0935 | 766 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 767 | rcu_read_unlock(); |
502b0935 YK |
768 | goto discard; |
769 | } | |
770 | ||
1da177e4 | 771 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 772 | rcu_read_unlock(); |
50fba2aa | 773 | goto discard; |
1da177e4 LT |
774 | } |
775 | ||
d0087b29 | 776 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 777 | t->dev->stats.rx_dropped++; |
2922bc8a | 778 | rcu_read_unlock(); |
1da177e4 LT |
779 | goto discard; |
780 | } | |
781 | secpath_reset(skb); | |
b0e380b1 | 782 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 783 | skb_reset_network_header(skb); |
8359925b | 784 | skb->protocol = htons(protocol); |
1da177e4 LT |
785 | skb->pkt_type = PACKET_HOST; |
786 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 787 | |
8560f226 ED |
788 | tstats = this_cpu_ptr(t->dev->tstats); |
789 | tstats->rx_packets++; | |
790 | tstats->rx_bytes += skb->len; | |
791 | ||
792 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 793 | |
d19d56dd | 794 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 795 | |
caf586e5 | 796 | netif_rx(skb); |
8990f468 | 797 | |
2922bc8a | 798 | rcu_read_unlock(); |
1da177e4 LT |
799 | return 0; |
800 | } | |
2922bc8a | 801 | rcu_read_unlock(); |
1da177e4 | 802 | return 1; |
50fba2aa HX |
803 | |
804 | discard: | |
805 | kfree_skb(skb); | |
806 | return 0; | |
1da177e4 LT |
807 | } |
808 | ||
c4d3efaf YK |
809 | static int ip4ip6_rcv(struct sk_buff *skb) |
810 | { | |
502b0935 YK |
811 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
812 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
813 | } |
814 | ||
8359925b YK |
815 | static int ip6ip6_rcv(struct sk_buff *skb) |
816 | { | |
502b0935 YK |
817 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
818 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
819 | } |
820 | ||
6fb32dde VN |
821 | struct ipv6_tel_txoption { |
822 | struct ipv6_txoptions ops; | |
823 | __u8 dst_opt[8]; | |
824 | }; | |
1da177e4 | 825 | |
6fb32dde VN |
826 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
827 | { | |
828 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 829 | |
6fb32dde VN |
830 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
831 | opt->dst_opt[3] = 1; | |
832 | opt->dst_opt[4] = encap_limit; | |
833 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
834 | opt->dst_opt[6] = 1; | |
1da177e4 | 835 | |
6fb32dde VN |
836 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
837 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
838 | } |
839 | ||
840 | /** | |
3144581c | 841 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 842 | * @t: the outgoing tunnel device |
1ab1457c | 843 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
844 | * |
845 | * Description: | |
1ab1457c | 846 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
847 | * doesn't match source of incoming packet. |
848 | * | |
1ab1457c | 849 | * Return: |
1da177e4 LT |
850 | * 1 if conflict, |
851 | * 0 else | |
852 | **/ | |
853 | ||
92113bfd | 854 | static inline bool |
b71d1d42 | 855 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
856 | { |
857 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
858 | } | |
859 | ||
c12b395a | 860 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 861 | { |
c12b395a | 862 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 863 | int ret = 0; |
2f7f54b7 | 864 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 865 | |
1ab1457c | 866 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
867 | struct net_device *ldev = NULL; |
868 | ||
f1a28eab | 869 | rcu_read_lock(); |
09c6bbf0 | 870 | if (p->link) |
f1a28eab | 871 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 872 | |
2f7f54b7 | 873 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
874 | pr_warn("%s xmit: Local address not yet configured!\n", |
875 | p->name); | |
09c6bbf0 | 876 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 877 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
878 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
879 | p->name); | |
09c6bbf0 VN |
880 | else |
881 | ret = 1; | |
f1a28eab | 882 | rcu_read_unlock(); |
09c6bbf0 VN |
883 | } |
884 | return ret; | |
885 | } | |
c12b395a | 886 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
887 | ||
1da177e4 | 888 | /** |
61ec2aec | 889 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 890 | * @skb: the outgoing socket buffer |
1ab1457c | 891 | * @dev: the outgoing tunnel device |
61ec2aec YK |
892 | * @dsfield: dscp code for outer header |
893 | * @fl: flow of tunneled packet | |
894 | * @encap_limit: encapsulation limit | |
895 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
896 | * |
897 | * Description: | |
898 | * Build new header and do some sanity checks on the packet before sending | |
899 | * it. | |
900 | * | |
1ab1457c | 901 | * Return: |
c4d3efaf | 902 | * 0 on success |
61ec2aec YK |
903 | * -1 fail |
904 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
905 | **/ |
906 | ||
61ec2aec YK |
907 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
908 | struct net_device *dev, | |
909 | __u8 dsfield, | |
4c9483b2 | 910 | struct flowi6 *fl6, |
61ec2aec YK |
911 | int encap_limit, |
912 | __u32 *pmtu) | |
1da177e4 | 913 | { |
52479b62 | 914 | struct net *net = dev_net(dev); |
2941a486 | 915 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 916 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 917 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 918 | struct ipv6_tel_txoption opt; |
d24f22f3 | 919 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
920 | struct net_device *tdev; |
921 | int mtu; | |
c2636b4d | 922 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 923 | u8 proto; |
61ec2aec | 924 | int err = -1; |
1da177e4 | 925 | int pkt_len; |
1da177e4 | 926 | |
d24f22f3 ED |
927 | if (!fl6->flowi6_mark) |
928 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
929 | if (!dst) { |
930 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 931 | |
89b02126 | 932 | if (ndst->error) |
a57ebc90 | 933 | goto tx_err_link_failure; |
89b02126 ED |
934 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
935 | if (IS_ERR(ndst)) { | |
936 | err = PTR_ERR(ndst); | |
937 | ndst = NULL; | |
452edd59 DM |
938 | goto tx_err_link_failure; |
939 | } | |
89b02126 | 940 | dst = ndst; |
a57ebc90 | 941 | } |
1da177e4 LT |
942 | |
943 | tdev = dst->dev; | |
944 | ||
945 | if (tdev == dev) { | |
946 | stats->collisions++; | |
e87cc472 JP |
947 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
948 | t->parms.name); | |
1da177e4 LT |
949 | goto tx_err_dst_release; |
950 | } | |
951 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 952 | if (encap_limit >= 0) { |
1da177e4 LT |
953 | max_headroom += 8; |
954 | mtu -= 8; | |
955 | } | |
956 | if (mtu < IPV6_MIN_MTU) | |
957 | mtu = IPV6_MIN_MTU; | |
adf30907 | 958 | if (skb_dst(skb)) |
6700c270 | 959 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 960 | if (skb->len > mtu) { |
61ec2aec YK |
961 | *pmtu = mtu; |
962 | err = -EMSGSIZE; | |
1da177e4 LT |
963 | goto tx_err_dst_release; |
964 | } | |
965 | ||
966 | /* | |
967 | * Okay, now see if we can stuff it in the buffer as-is. | |
968 | */ | |
969 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 970 | |
cfbba49d PM |
971 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
972 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 973 | struct sk_buff *new_skb; |
1ab1457c | 974 | |
1da177e4 LT |
975 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
976 | goto tx_err_dst_release; | |
977 | ||
978 | if (skb->sk) | |
979 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 980 | consume_skb(skb); |
1da177e4 LT |
981 | skb = new_skb; |
982 | } | |
adf30907 | 983 | skb_dst_drop(skb); |
d24f22f3 ED |
984 | if (fl6->flowi6_mark) { |
985 | skb_dst_set(skb, dst); | |
986 | ndst = NULL; | |
987 | } else { | |
988 | skb_dst_set_noref(skb, dst); | |
989 | } | |
b0e380b1 | 990 | skb->transport_header = skb->network_header; |
1da177e4 | 991 | |
4c9483b2 | 992 | proto = fl6->flowi6_proto; |
6fb32dde VN |
993 | if (encap_limit >= 0) { |
994 | init_tel_txopt(&opt, encap_limit); | |
995 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
996 | } | |
e2d1bca7 ACM |
997 | skb_push(skb, sizeof(struct ipv6hdr)); |
998 | skb_reset_network_header(skb); | |
0660e03f | 999 | ipv6h = ipv6_hdr(skb); |
4c9483b2 | 1000 | *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000); |
1da177e4 LT |
1001 | dsfield = INET_ECN_encapsulate(0, dsfield); |
1002 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
1003 | ipv6h->hop_limit = t->parms.hop_limit; |
1004 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1005 | ipv6h->saddr = fl6->saddr; |
1006 | ipv6h->daddr = fl6->daddr; | |
1da177e4 LT |
1007 | nf_reset(skb); |
1008 | pkt_len = skb->len; | |
ef76bc23 | 1009 | err = ip6_local_out(skb); |
1da177e4 | 1010 | |
b9df3cb8 | 1011 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
1012 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
1013 | ||
1014 | tstats->tx_bytes += pkt_len; | |
1015 | tstats->tx_packets++; | |
1da177e4 LT |
1016 | } else { |
1017 | stats->tx_errors++; | |
1018 | stats->tx_aborted_errors++; | |
1019 | } | |
89b02126 ED |
1020 | if (ndst) |
1021 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1022 | return 0; |
1023 | tx_err_link_failure: | |
1024 | stats->tx_carrier_errors++; | |
1025 | dst_link_failure(skb); | |
1026 | tx_err_dst_release: | |
89b02126 | 1027 | dst_release(ndst); |
61ec2aec YK |
1028 | return err; |
1029 | } | |
1030 | ||
c4d3efaf YK |
1031 | static inline int |
1032 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1033 | { | |
1034 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1035 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1036 | int encap_limit = -1; |
4c9483b2 | 1037 | struct flowi6 fl6; |
c4d3efaf YK |
1038 | __u8 dsfield; |
1039 | __u32 mtu; | |
1040 | int err; | |
1041 | ||
502b0935 YK |
1042 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1043 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1044 | return -1; |
1045 | ||
1046 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1047 | encap_limit = t->parms.encap_limit; | |
1048 | ||
4c9483b2 DM |
1049 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1050 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1051 | |
1052 | dsfield = ipv4_get_dsfield(iph); | |
1053 | ||
d24f22f3 | 1054 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1055 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1056 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1057 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1058 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1059 | |
4c9483b2 | 1060 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1061 | if (err != 0) { |
1062 | /* XXX: send ICMP error even if DF is not set. */ | |
1063 | if (err == -EMSGSIZE) | |
1064 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1065 | htonl(mtu)); | |
1066 | return -1; | |
1067 | } | |
1068 | ||
1069 | return 0; | |
1070 | } | |
1071 | ||
61ec2aec YK |
1072 | static inline int |
1073 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1074 | { | |
1075 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1076 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1077 | int encap_limit = -1; |
1078 | __u16 offset; | |
4c9483b2 | 1079 | struct flowi6 fl6; |
61ec2aec YK |
1080 | __u8 dsfield; |
1081 | __u32 mtu; | |
1082 | int err; | |
1083 | ||
502b0935 YK |
1084 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1085 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1086 | return -1; |
1087 | ||
c12b395a | 1088 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1089 | if (offset > 0) { |
61ec2aec | 1090 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1091 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1092 | if (tel->encap_limit == 0) { |
1093 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1094 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1095 | return -1; |
1096 | } | |
1097 | encap_limit = tel->encap_limit - 1; | |
1098 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1099 | encap_limit = t->parms.encap_limit; | |
1100 | ||
4c9483b2 DM |
1101 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1102 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1103 | |
1104 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1105 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1106 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1107 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1108 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1109 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1110 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1111 | |
4c9483b2 | 1112 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1113 | if (err != 0) { |
1114 | if (err == -EMSGSIZE) | |
3ffe533c | 1115 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1116 | return -1; |
1117 | } | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
6fef4c0c | 1122 | static netdev_tx_t |
61ec2aec YK |
1123 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1124 | { | |
1125 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1126 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1127 | int ret; |
1128 | ||
61ec2aec | 1129 | switch (skb->protocol) { |
60678040 | 1130 | case htons(ETH_P_IP): |
c4d3efaf YK |
1131 | ret = ip4ip6_tnl_xmit(skb, dev); |
1132 | break; | |
60678040 | 1133 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1134 | ret = ip6ip6_tnl_xmit(skb, dev); |
1135 | break; | |
1136 | default: | |
1137 | goto tx_err; | |
1138 | } | |
1139 | ||
1140 | if (ret < 0) | |
1141 | goto tx_err; | |
1142 | ||
6ed10654 | 1143 | return NETDEV_TX_OK; |
61ec2aec | 1144 | |
1da177e4 LT |
1145 | tx_err: |
1146 | stats->tx_errors++; | |
1147 | stats->tx_dropped++; | |
1148 | kfree_skb(skb); | |
6ed10654 | 1149 | return NETDEV_TX_OK; |
1da177e4 LT |
1150 | } |
1151 | ||
3144581c | 1152 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1153 | { |
1154 | struct net_device *dev = t->dev; | |
c12b395a | 1155 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1156 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1157 | |
3a6d54c5 JP |
1158 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1159 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1160 | |
1161 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1162 | fl6->saddr = p->laddr; |
1163 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1164 | fl6->flowi6_oif = p->link; |
1165 | fl6->flowlabel = 0; | |
1da177e4 LT |
1166 | |
1167 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1168 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1169 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1170 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1171 | |
d0087b29 VN |
1172 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1173 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1174 | |
1175 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1176 | dev->flags |= IFF_POINTOPOINT; | |
1177 | else | |
1178 | dev->flags &= ~IFF_POINTOPOINT; | |
1179 | ||
1180 | dev->iflink = p->link; | |
1181 | ||
1182 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1183 | int strict = (ipv6_addr_type(&p->raddr) & |
1184 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1185 | ||
2f7f54b7 PE |
1186 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1187 | &p->raddr, &p->laddr, | |
305d4b3c | 1188 | p->link, strict); |
1da177e4 LT |
1189 | |
1190 | if (rt == NULL) | |
1191 | return; | |
1192 | ||
d1918542 DM |
1193 | if (rt->dst.dev) { |
1194 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1195 | sizeof (struct ipv6hdr); |
1196 | ||
d1918542 | 1197 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1198 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1199 | dev->mtu-=8; | |
1da177e4 LT |
1200 | |
1201 | if (dev->mtu < IPV6_MIN_MTU) | |
1202 | dev->mtu = IPV6_MIN_MTU; | |
1203 | } | |
94e187c0 | 1204 | ip6_rt_put(rt); |
1da177e4 LT |
1205 | } |
1206 | } | |
1207 | ||
1208 | /** | |
3144581c | 1209 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1210 | * @t: tunnel to be changed |
1211 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1212 | * |
1213 | * Description: | |
3144581c | 1214 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1215 | **/ |
1216 | ||
1217 | static int | |
c12b395a | 1218 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1219 | { |
4e3fd7a0 AD |
1220 | t->parms.laddr = p->laddr; |
1221 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1222 | t->parms.flags = p->flags; |
1223 | t->parms.hop_limit = p->hop_limit; | |
1224 | t->parms.encap_limit = p->encap_limit; | |
1225 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1226 | t->parms.link = p->link; |
502b0935 | 1227 | t->parms.proto = p->proto; |
0c088890 | 1228 | ip6_tnl_dst_reset(t); |
3144581c | 1229 | ip6_tnl_link_config(t); |
1da177e4 LT |
1230 | return 0; |
1231 | } | |
1232 | ||
c12b395a | 1233 | static void |
1234 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1235 | { | |
1236 | p->laddr = u->laddr; | |
1237 | p->raddr = u->raddr; | |
1238 | p->flags = u->flags; | |
1239 | p->hop_limit = u->hop_limit; | |
1240 | p->encap_limit = u->encap_limit; | |
1241 | p->flowinfo = u->flowinfo; | |
1242 | p->link = u->link; | |
1243 | p->proto = u->proto; | |
1244 | memcpy(p->name, u->name, sizeof(u->name)); | |
1245 | } | |
1246 | ||
1247 | static void | |
1248 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1249 | { | |
1250 | u->laddr = p->laddr; | |
1251 | u->raddr = p->raddr; | |
1252 | u->flags = p->flags; | |
1253 | u->hop_limit = p->hop_limit; | |
1254 | u->encap_limit = p->encap_limit; | |
1255 | u->flowinfo = p->flowinfo; | |
1256 | u->link = p->link; | |
1257 | u->proto = p->proto; | |
1258 | memcpy(u->name, p->name, sizeof(u->name)); | |
1259 | } | |
1260 | ||
1da177e4 | 1261 | /** |
3144581c | 1262 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1263 | * @dev: virtual device associated with tunnel |
1264 | * @ifr: parameters passed from userspace | |
1265 | * @cmd: command to be performed | |
1266 | * | |
1267 | * Description: | |
3144581c | 1268 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1269 | * from userspace. |
1da177e4 LT |
1270 | * |
1271 | * The possible commands are the following: | |
1272 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1273 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1274 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1275 | * %SIOCDELTUNNEL: delete tunnel | |
1276 | * | |
1ab1457c | 1277 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1278 | * initialization, can be used for creating other tunnel devices. |
1279 | * | |
1280 | * Return: | |
1281 | * 0 on success, | |
1282 | * %-EFAULT if unable to copy data to or from userspace, | |
1283 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1284 | * %-EINVAL if passed tunnel parameters are invalid, | |
1285 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1286 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1287 | **/ | |
1288 | ||
1289 | static int | |
3144581c | 1290 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1291 | { |
1292 | int err = 0; | |
1da177e4 | 1293 | struct ip6_tnl_parm p; |
c12b395a | 1294 | struct __ip6_tnl_parm p1; |
1da177e4 | 1295 | struct ip6_tnl *t = NULL; |
2dd02c89 PE |
1296 | struct net *net = dev_net(dev); |
1297 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1298 | |
1299 | switch (cmd) { | |
1300 | case SIOCGETTUNNEL: | |
15820e12 | 1301 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1302 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1303 | err = -EFAULT; |
1304 | break; | |
1305 | } | |
c12b395a | 1306 | ip6_tnl_parm_from_user(&p1, &p); |
1307 | t = ip6_tnl_locate(net, &p1, 0); | |
5ef5d6c5 DC |
1308 | } else { |
1309 | memset(&p, 0, sizeof(p)); | |
567131a7 VN |
1310 | } |
1311 | if (t == NULL) | |
2941a486 | 1312 | t = netdev_priv(dev); |
c12b395a | 1313 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1314 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1315 | err = -EFAULT; | |
1316 | } | |
1317 | break; | |
1318 | case SIOCADDTUNNEL: | |
1319 | case SIOCCHGTUNNEL: | |
1320 | err = -EPERM; | |
1da177e4 LT |
1321 | if (!capable(CAP_NET_ADMIN)) |
1322 | break; | |
567131a7 VN |
1323 | err = -EFAULT; |
1324 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1325 | break; |
567131a7 | 1326 | err = -EINVAL; |
502b0935 YK |
1327 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1328 | p.proto != 0) | |
1da177e4 | 1329 | break; |
c12b395a | 1330 | ip6_tnl_parm_from_user(&p1, &p); |
1331 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1332 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1333 | if (t != NULL) { |
1334 | if (t->dev != dev) { | |
1335 | err = -EEXIST; | |
1336 | break; | |
1337 | } | |
1338 | } else | |
1339 | t = netdev_priv(dev); | |
1340 | ||
2dd02c89 | 1341 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1342 | synchronize_net(); |
c12b395a | 1343 | err = ip6_tnl_change(t, &p1); |
2dd02c89 | 1344 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1345 | netdev_state_change(dev); |
1346 | } | |
567131a7 | 1347 | if (t) { |
1da177e4 | 1348 | err = 0; |
c12b395a | 1349 | ip6_tnl_parm_to_user(&p, &t->parms); |
1350 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1351 | err = -EFAULT; |
1352 | ||
1353 | } else | |
1354 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1355 | break; |
1356 | case SIOCDELTUNNEL: | |
1357 | err = -EPERM; | |
1358 | if (!capable(CAP_NET_ADMIN)) | |
1359 | break; | |
1360 | ||
15820e12 | 1361 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1362 | err = -EFAULT; |
1363 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1364 | break; |
567131a7 | 1365 | err = -ENOENT; |
c12b395a | 1366 | ip6_tnl_parm_from_user(&p1, &p); |
1367 | t = ip6_tnl_locate(net, &p1, 0); | |
1368 | if (t == NULL) | |
1da177e4 | 1369 | break; |
567131a7 | 1370 | err = -EPERM; |
15820e12 | 1371 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1372 | break; |
567131a7 | 1373 | dev = t->dev; |
1da177e4 | 1374 | } |
22f8cde5 SH |
1375 | err = 0; |
1376 | unregister_netdevice(dev); | |
1da177e4 LT |
1377 | break; |
1378 | default: | |
1379 | err = -EINVAL; | |
1380 | } | |
1381 | return err; | |
1382 | } | |
1383 | ||
1da177e4 | 1384 | /** |
3144581c | 1385 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1386 | * @dev: virtual device associated with tunnel |
1387 | * @new_mtu: the new mtu | |
1388 | * | |
1389 | * Return: | |
1390 | * 0 on success, | |
1391 | * %-EINVAL if mtu too small | |
1392 | **/ | |
1393 | ||
1394 | static int | |
3144581c | 1395 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1396 | { |
1397 | if (new_mtu < IPV6_MIN_MTU) { | |
1398 | return -EINVAL; | |
1399 | } | |
1400 | dev->mtu = new_mtu; | |
1401 | return 0; | |
1402 | } | |
1403 | ||
1326c3d5 SH |
1404 | |
1405 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1406 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1407 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1408 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1409 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1410 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1411 | }; |
1412 | ||
8560f226 | 1413 | |
1da177e4 | 1414 | /** |
3144581c | 1415 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1416 | * @dev: virtual device associated with tunnel |
1417 | * | |
1418 | * Description: | |
1419 | * Initialize function pointers and device parameters | |
1420 | **/ | |
1421 | ||
3144581c | 1422 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1423 | { |
381601e5 AF |
1424 | struct ip6_tnl *t; |
1425 | ||
1326c3d5 | 1426 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1427 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1428 | |
1429 | dev->type = ARPHRD_TUNNEL6; | |
1430 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1431 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1432 | t = netdev_priv(dev); |
1433 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1434 | dev->mtu-=8; | |
1da177e4 LT |
1435 | dev->flags |= IFF_NOARP; |
1436 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1437 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1438 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1439 | } |
1440 | ||
1441 | ||
1442 | /** | |
3144581c | 1443 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1444 | * @dev: virtual device associated with tunnel |
1445 | **/ | |
1446 | ||
8560f226 | 1447 | static inline int |
3144581c | 1448 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1449 | { |
2941a486 | 1450 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1451 | |
1da177e4 | 1452 | t->dev = dev; |
8560f226 ED |
1453 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1454 | if (!dev->tstats) | |
1455 | return -ENOMEM; | |
1456 | return 0; | |
1da177e4 LT |
1457 | } |
1458 | ||
1459 | /** | |
3144581c | 1460 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1461 | * @dev: virtual device associated with tunnel |
1462 | **/ | |
1463 | ||
8560f226 | 1464 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1465 | { |
2941a486 | 1466 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1467 | int err = ip6_tnl_dev_init_gen(dev); |
1468 | ||
1469 | if (err) | |
1470 | return err; | |
3144581c | 1471 | ip6_tnl_link_config(t); |
8560f226 | 1472 | return 0; |
1da177e4 LT |
1473 | } |
1474 | ||
1475 | /** | |
3144581c | 1476 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1477 | * @dev: fallback device |
1478 | * | |
1479 | * Return: 0 | |
1480 | **/ | |
1481 | ||
8560f226 | 1482 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1483 | { |
2941a486 | 1484 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1485 | struct net *net = dev_net(dev); |
1486 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1487 | int err = ip6_tnl_dev_init_gen(dev); |
1488 | ||
1489 | if (err) | |
1490 | return err; | |
3e6c9fb5 | 1491 | |
502b0935 | 1492 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1493 | dev_hold(dev); |
d0087b29 VN |
1494 | |
1495 | ip6_tnl_link_config(t); | |
1496 | ||
cf778b00 | 1497 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1498 | return 0; |
1da177e4 LT |
1499 | } |
1500 | ||
b58d731a | 1501 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1502 | { |
1503 | return | |
1504 | /* IFLA_IPTUN_LINK */ | |
1505 | nla_total_size(4) + | |
1506 | /* IFLA_IPTUN_LOCAL */ | |
1507 | nla_total_size(sizeof(struct in6_addr)) + | |
1508 | /* IFLA_IPTUN_REMOTE */ | |
1509 | nla_total_size(sizeof(struct in6_addr)) + | |
1510 | /* IFLA_IPTUN_TTL */ | |
1511 | nla_total_size(1) + | |
1512 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1513 | nla_total_size(1) + | |
1514 | /* IFLA_IPTUN_FLOWINFO */ | |
1515 | nla_total_size(4) + | |
1516 | /* IFLA_IPTUN_FLAGS */ | |
1517 | nla_total_size(4) + | |
cfa323b6 ND |
1518 | /* IFLA_IPTUN_PROTO */ |
1519 | nla_total_size(1) + | |
c075b130 ND |
1520 | 0; |
1521 | } | |
1522 | ||
b58d731a | 1523 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1524 | { |
1525 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1526 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1527 | ||
1528 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1529 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
1530 | &parm->raddr) || | |
1531 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), | |
1532 | &parm->laddr) || | |
1533 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || | |
1534 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1535 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1536 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1537 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1538 | goto nla_put_failure; |
1539 | return 0; | |
1540 | ||
1541 | nla_put_failure: | |
1542 | return -EMSGSIZE; | |
1543 | } | |
1544 | ||
1545 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { | |
1546 | .kind = "ip6tnl", | |
1547 | .maxtype = IFLA_IPTUN_MAX, | |
1548 | .priv_size = sizeof(struct ip6_tnl), | |
b58d731a ND |
1549 | .get_size = ip6_tnl_get_size, |
1550 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1551 | }; |
1552 | ||
3ff2cfa5 | 1553 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1554 | .handler = ip4ip6_rcv, |
1555 | .err_handler = ip4ip6_err, | |
1556 | .priority = 1, | |
1557 | }; | |
1558 | ||
3ff2cfa5 | 1559 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1560 | .handler = ip6ip6_rcv, |
1561 | .err_handler = ip6ip6_err, | |
d2acc347 | 1562 | .priority = 1, |
1da177e4 LT |
1563 | }; |
1564 | ||
2c8c1e72 | 1565 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1566 | { |
1567 | int h; | |
1568 | struct ip6_tnl *t; | |
cf4432f5 | 1569 | LIST_HEAD(list); |
3e6c9fb5 PE |
1570 | |
1571 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1572 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1573 | while (t != NULL) { |
1574 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1575 | t = rtnl_dereference(t->next); |
cf4432f5 | 1576 | } |
3e6c9fb5 PE |
1577 | } |
1578 | ||
94767632 | 1579 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1580 | unregister_netdevice_queue(t->dev, &list); |
1581 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1582 | } |
1583 | ||
2c8c1e72 | 1584 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1585 | { |
ac31cd3c | 1586 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1587 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1588 | int err; |
13eeb8e9 | 1589 | |
3e6c9fb5 PE |
1590 | ip6n->tnls[0] = ip6n->tnls_wc; |
1591 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1592 | ||
15820e12 PE |
1593 | err = -ENOMEM; |
1594 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1595 | ip6_tnl_dev_setup); | |
1596 | ||
1597 | if (!ip6n->fb_tnl_dev) | |
1598 | goto err_alloc_dev; | |
be77e593 | 1599 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1600 | |
8560f226 ED |
1601 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1602 | if (err < 0) | |
1603 | goto err_register; | |
15820e12 PE |
1604 | |
1605 | err = register_netdev(ip6n->fb_tnl_dev); | |
1606 | if (err < 0) | |
1607 | goto err_register; | |
731abb9c JB |
1608 | |
1609 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1610 | ||
1611 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1612 | return 0; |
1613 | ||
15820e12 | 1614 | err_register: |
8560f226 | 1615 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1616 | err_alloc_dev: |
13eeb8e9 PE |
1617 | return err; |
1618 | } | |
1619 | ||
2c8c1e72 | 1620 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1621 | { |
ac31cd3c | 1622 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1623 | |
3e6c9fb5 PE |
1624 | rtnl_lock(); |
1625 | ip6_tnl_destroy_tunnels(ip6n); | |
1626 | rtnl_unlock(); | |
13eeb8e9 PE |
1627 | } |
1628 | ||
1629 | static struct pernet_operations ip6_tnl_net_ops = { | |
1630 | .init = ip6_tnl_init_net, | |
1631 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1632 | .id = &ip6_tnl_net_id, |
1633 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1634 | }; |
1635 | ||
1da177e4 LT |
1636 | /** |
1637 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1638 | * | |
1639 | * Return: 0 on success | |
1640 | **/ | |
1641 | ||
1642 | static int __init ip6_tunnel_init(void) | |
1643 | { | |
1644 | int err; | |
1645 | ||
d5aa407f AD |
1646 | err = register_pernet_device(&ip6_tnl_net_ops); |
1647 | if (err < 0) | |
1648 | goto out_pernet; | |
1649 | ||
1650 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1651 | if (err < 0) { | |
f3213831 | 1652 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1653 | goto out_ip4ip6; |
c4d3efaf YK |
1654 | } |
1655 | ||
d5aa407f AD |
1656 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1657 | if (err < 0) { | |
f3213831 | 1658 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1659 | goto out_ip6ip6; |
1da177e4 | 1660 | } |
c075b130 ND |
1661 | err = rtnl_link_register(&ip6_link_ops); |
1662 | if (err < 0) | |
1663 | goto rtnl_link_failed; | |
13eeb8e9 | 1664 | |
1da177e4 | 1665 | return 0; |
d5aa407f | 1666 | |
c075b130 ND |
1667 | rtnl_link_failed: |
1668 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1669 | out_ip6ip6: |
c4d3efaf | 1670 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1671 | out_ip4ip6: |
1672 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1673 | out_pernet: | |
1da177e4 LT |
1674 | return err; |
1675 | } | |
1676 | ||
1677 | /** | |
1678 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1679 | **/ | |
1680 | ||
1681 | static void __exit ip6_tunnel_cleanup(void) | |
1682 | { | |
c075b130 | 1683 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1684 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1685 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1686 | |
73d605d1 | 1687 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1688 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1689 | |
ac31cd3c | 1690 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | module_init(ip6_tunnel_init); | |
1694 | module_exit(ip6_tunnel_cleanup); |