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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/module.h> |
4fc268d2 | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/errno.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
1da177e4 LT |
26 | #include <linux/net.h> |
27 | #include <linux/in6.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/icmp.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 34 | #include <linux/if_ether.h> |
1da177e4 LT |
35 | |
36 | #include <net/sock.h> | |
37 | #include <net/snmp.h> | |
38 | ||
39 | #include <net/ipv6.h> | |
40 | #include <net/protocol.h> | |
41 | #include <net/transp_v6.h> | |
42 | #include <net/ip6_fib.h> | |
43 | #include <net/ip6_route.h> | |
44 | #include <net/ndisc.h> | |
45 | #include <net/addrconf.h> | |
46 | #include <net/ip.h> | |
47 | #include <net/udp.h> | |
48 | #include <net/icmp.h> | |
49 | #include <net/ipip.h> | |
50 | #include <net/inet_ecn.h> | |
51 | #include <net/xfrm.h> | |
52 | #include <net/dsfield.h> | |
8190d900 PE |
53 | #include <net/net_namespace.h> |
54 | #include <net/netns/generic.h> | |
1da177e4 LT |
55 | |
56 | /* | |
57 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
58 | ||
59 | For comments look at net/ipv4/ip_gre.c --ANK | |
60 | */ | |
61 | ||
62 | #define HASH_SIZE 16 | |
e69a4adc | 63 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 64 | |
1326c3d5 | 65 | static void ipip6_tunnel_init(struct net_device *dev); |
1da177e4 LT |
66 | static void ipip6_tunnel_setup(struct net_device *dev); |
67 | ||
f99189b1 | 68 | static int sit_net_id __read_mostly; |
8190d900 | 69 | struct sit_net { |
29182176 PE |
70 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
71 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
72 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
73 | struct ip_tunnel *tunnels_wc[1]; | |
74 | struct ip_tunnel **tunnels[4]; | |
75 | ||
cd3dbc19 | 76 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
77 | }; |
78 | ||
4543c10d ED |
79 | /* |
80 | * Locking : hash tables are protected by RCU and a spinlock | |
81 | */ | |
82 | static DEFINE_SPINLOCK(ipip6_lock); | |
83 | ||
84 | #define for_each_ip_tunnel_rcu(start) \ | |
85 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 86 | |
4543c10d ED |
87 | /* |
88 | * Must be invoked with rcu_read_lock | |
89 | */ | |
ca8def14 | 90 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 91 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 LT |
92 | { |
93 | unsigned h0 = HASH(remote); | |
94 | unsigned h1 = HASH(local); | |
95 | struct ip_tunnel *t; | |
29182176 | 96 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 97 | |
4543c10d | 98 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 99 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
100 | remote == t->parms.iph.daddr && |
101 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
102 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
103 | return t; |
104 | } | |
4543c10d | 105 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { |
4fddbf5d SH |
106 | if (remote == t->parms.iph.daddr && |
107 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
108 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
109 | return t; |
110 | } | |
4543c10d | 111 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { |
4fddbf5d SH |
112 | if (local == t->parms.iph.saddr && |
113 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
114 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
115 | return t; |
116 | } | |
4543c10d | 117 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 118 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
119 | return t; |
120 | return NULL; | |
121 | } | |
122 | ||
ca8def14 PE |
123 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
124 | struct ip_tunnel_parm *parms) | |
1da177e4 | 125 | { |
420fe234 YH |
126 | __be32 remote = parms->iph.daddr; |
127 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
128 | unsigned h = 0; |
129 | int prio = 0; | |
130 | ||
131 | if (remote) { | |
132 | prio |= 2; | |
133 | h ^= HASH(remote); | |
134 | } | |
135 | if (local) { | |
136 | prio |= 1; | |
137 | h ^= HASH(local); | |
138 | } | |
29182176 | 139 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
140 | } |
141 | ||
ca8def14 PE |
142 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
143 | struct ip_tunnel *t) | |
420fe234 | 144 | { |
ca8def14 | 145 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
146 | } |
147 | ||
ca8def14 | 148 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
149 | { |
150 | struct ip_tunnel **tp; | |
151 | ||
ca8def14 | 152 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 | 153 | if (t == *tp) { |
4543c10d | 154 | spin_lock_bh(&ipip6_lock); |
1da177e4 | 155 | *tp = t->next; |
4543c10d | 156 | spin_unlock_bh(&ipip6_lock); |
1da177e4 LT |
157 | break; |
158 | } | |
159 | } | |
160 | } | |
161 | ||
ca8def14 | 162 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 163 | { |
ca8def14 | 164 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 | 165 | |
4543c10d | 166 | spin_lock_bh(&ipip6_lock); |
1da177e4 | 167 | t->next = *tp; |
4543c10d ED |
168 | rcu_assign_pointer(*tp, t); |
169 | spin_unlock_bh(&ipip6_lock); | |
1da177e4 LT |
170 | } |
171 | ||
e0c93948 | 172 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
173 | { |
174 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
175 | struct ip_tunnel *t = netdev_priv(dev); |
176 | ||
fa857afc YH |
177 | if (t->dev == sitn->fb_tunnel_dev) { |
178 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
179 | t->ip6rd.relay_prefix = 0; | |
180 | t->ip6rd.prefixlen = 16; | |
181 | t->ip6rd.relay_prefixlen = 0; | |
182 | } else { | |
183 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
184 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
185 | } | |
186 | #endif | |
187 | } | |
188 | ||
ca8def14 PE |
189 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
190 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 191 | { |
e69a4adc AV |
192 | __be32 remote = parms->iph.daddr; |
193 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
194 | struct ip_tunnel *t, **tp, *nt; |
195 | struct net_device *dev; | |
1da177e4 | 196 | char name[IFNAMSIZ]; |
ca8def14 | 197 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 198 | |
ca8def14 | 199 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
8db99e57 | 200 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
201 | remote == t->parms.iph.daddr && |
202 | parms->link == t->parms.link) { | |
8db99e57 SH |
203 | if (create) |
204 | return NULL; | |
205 | else | |
206 | return t; | |
207 | } | |
1da177e4 LT |
208 | } |
209 | if (!create) | |
210 | goto failed; | |
211 | ||
212 | if (parms->name[0]) | |
213 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
214 | else |
215 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
216 | |
217 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
218 | if (dev == NULL) | |
219 | return NULL; | |
220 | ||
7a97146c PE |
221 | dev_net_set(dev, net); |
222 | ||
b37d428b PE |
223 | if (strchr(name, '%')) { |
224 | if (dev_alloc_name(dev, name) < 0) | |
225 | goto failed_free; | |
226 | } | |
227 | ||
2941a486 | 228 | nt = netdev_priv(dev); |
1326c3d5 | 229 | |
1da177e4 | 230 | nt->parms = *parms; |
1b1d8f73 | 231 | ipip6_tunnel_init(dev); |
e0c93948 | 232 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 233 | |
c7dc89c0 FT |
234 | if (parms->i_flags & SIT_ISATAP) |
235 | dev->priv_flags |= IFF_ISATAP; | |
236 | ||
b37d428b PE |
237 | if (register_netdevice(dev) < 0) |
238 | goto failed_free; | |
1da177e4 LT |
239 | |
240 | dev_hold(dev); | |
241 | ||
ca8def14 | 242 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
243 | return nt; |
244 | ||
b37d428b PE |
245 | failed_free: |
246 | free_netdev(dev); | |
1da177e4 LT |
247 | failed: |
248 | return NULL; | |
249 | } | |
250 | ||
ef9a9d11 ED |
251 | static DEFINE_SPINLOCK(ipip6_prl_lock); |
252 | ||
253 | #define for_each_prl_rcu(start) \ | |
254 | for (prl = rcu_dereference(start); \ | |
255 | prl; \ | |
256 | prl = rcu_dereference(prl->next)) | |
257 | ||
fadf6bf0 | 258 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 259 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 260 | { |
ef9a9d11 | 261 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 262 | |
ef9a9d11 ED |
263 | for_each_prl_rcu(t->prl) |
264 | if (prl->addr == addr) | |
fadf6bf0 | 265 | break; |
ef9a9d11 | 266 | return prl; |
fadf6bf0 TF |
267 | |
268 | } | |
269 | ||
2b4743bd YH |
270 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
271 | struct ip_tunnel_prl __user *a) | |
300aaeea | 272 | { |
2b4743bd | 273 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
274 | struct ip_tunnel_prl_entry *prl; |
275 | unsigned int cmax, c = 0, ca, len; | |
276 | int ret = 0; | |
277 | ||
2b4743bd YH |
278 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
279 | return -EFAULT; | |
280 | cmax = kprl.datalen / sizeof(kprl); | |
281 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
282 | cmax = 1; |
283 | ||
284 | /* For simple GET or for root users, | |
285 | * we try harder to allocate. | |
286 | */ | |
287 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
288 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
289 | NULL; | |
290 | ||
ef9a9d11 | 291 | rcu_read_lock(); |
300aaeea YH |
292 | |
293 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
294 | ||
295 | if (!kp) { | |
296 | /* We don't try hard to allocate much memory for | |
297 | * non-root users. | |
298 | * For root users, retry allocating enough memory for | |
299 | * the answer. | |
300 | */ | |
301 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
302 | if (!kp) { | |
303 | ret = -ENOMEM; | |
304 | goto out; | |
305 | } | |
306 | } | |
307 | ||
308 | c = 0; | |
ef9a9d11 | 309 | for_each_prl_rcu(t->prl) { |
298bf12d | 310 | if (c >= cmax) |
300aaeea | 311 | break; |
2b4743bd | 312 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
313 | continue; |
314 | kp[c].addr = prl->addr; | |
315 | kp[c].flags = prl->flags; | |
316 | c++; | |
2b4743bd | 317 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
318 | break; |
319 | } | |
320 | out: | |
ef9a9d11 | 321 | rcu_read_unlock(); |
300aaeea YH |
322 | |
323 | len = sizeof(*kp) * c; | |
2b4743bd YH |
324 | ret = 0; |
325 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
326 | ret = -EFAULT; | |
300aaeea YH |
327 | |
328 | kfree(kp); | |
300aaeea | 329 | |
2b4743bd | 330 | return ret; |
300aaeea YH |
331 | } |
332 | ||
fadf6bf0 TF |
333 | static int |
334 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
335 | { | |
336 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
337 | int err = 0; |
338 | ||
0009ae1f YH |
339 | if (a->addr == htonl(INADDR_ANY)) |
340 | return -EINVAL; | |
341 | ||
ef9a9d11 | 342 | spin_lock(&ipip6_prl_lock); |
fadf6bf0 TF |
343 | |
344 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 345 | if (p->addr == a->addr) { |
ef9a9d11 ED |
346 | if (chg) { |
347 | p->flags = a->flags; | |
348 | goto out; | |
349 | } | |
3fcfa129 YH |
350 | err = -EEXIST; |
351 | goto out; | |
fadf6bf0 TF |
352 | } |
353 | } | |
354 | ||
3fcfa129 YH |
355 | if (chg) { |
356 | err = -ENXIO; | |
357 | goto out; | |
358 | } | |
fadf6bf0 TF |
359 | |
360 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
361 | if (!p) { |
362 | err = -ENOBUFS; | |
363 | goto out; | |
364 | } | |
fadf6bf0 | 365 | |
fadf6bf0 | 366 | p->next = t->prl; |
300aaeea YH |
367 | p->addr = a->addr; |
368 | p->flags = a->flags; | |
ef9a9d11 ED |
369 | t->prl_count++; |
370 | rcu_assign_pointer(t->prl, p); | |
3fcfa129 | 371 | out: |
ef9a9d11 | 372 | spin_unlock(&ipip6_prl_lock); |
3fcfa129 | 373 | return err; |
fadf6bf0 TF |
374 | } |
375 | ||
ef9a9d11 ED |
376 | static void prl_entry_destroy_rcu(struct rcu_head *head) |
377 | { | |
378 | kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head)); | |
379 | } | |
380 | ||
381 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
382 | { | |
383 | struct ip_tunnel_prl_entry *p, *n; | |
384 | ||
385 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
386 | do { | |
387 | n = p->next; | |
388 | kfree(p); | |
389 | p = n; | |
390 | } while (p); | |
391 | } | |
392 | ||
fadf6bf0 TF |
393 | static int |
394 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
395 | { | |
396 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
397 | int err = 0; |
398 | ||
ef9a9d11 | 399 | spin_lock(&ipip6_prl_lock); |
fadf6bf0 | 400 | |
0009ae1f | 401 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 402 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 403 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
404 | x = *p; |
405 | *p = x->next; | |
ef9a9d11 | 406 | call_rcu(&x->rcu_head, prl_entry_destroy_rcu); |
300aaeea | 407 | t->prl_count--; |
3fcfa129 | 408 | goto out; |
fadf6bf0 TF |
409 | } |
410 | } | |
3fcfa129 | 411 | err = -ENXIO; |
fadf6bf0 | 412 | } else { |
ef9a9d11 ED |
413 | if (t->prl) { |
414 | t->prl_count = 0; | |
fadf6bf0 | 415 | x = t->prl; |
ef9a9d11 ED |
416 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
417 | t->prl = NULL; | |
fadf6bf0 TF |
418 | } |
419 | } | |
3fcfa129 | 420 | out: |
ef9a9d11 | 421 | spin_unlock(&ipip6_prl_lock); |
4b279601 | 422 | return err; |
fadf6bf0 TF |
423 | } |
424 | ||
fadf6bf0 TF |
425 | static int |
426 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
427 | { | |
3fcfa129 | 428 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
429 | int ok = 1; |
430 | ||
ef9a9d11 | 431 | rcu_read_lock(); |
3fcfa129 | 432 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 433 | if (p) { |
300aaeea | 434 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
435 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
436 | else | |
437 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
438 | } else { | |
439 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
440 | if (ipv6_addr_is_isatap(addr6) && | |
441 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 442 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
443 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
444 | else | |
445 | ok = 0; | |
446 | } | |
ef9a9d11 | 447 | rcu_read_unlock(); |
fadf6bf0 TF |
448 | return ok; |
449 | } | |
450 | ||
1da177e4 LT |
451 | static void ipip6_tunnel_uninit(struct net_device *dev) |
452 | { | |
ca8def14 PE |
453 | struct net *net = dev_net(dev); |
454 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
455 | ||
cd3dbc19 | 456 | if (dev == sitn->fb_tunnel_dev) { |
4543c10d | 457 | spin_lock_bh(&ipip6_lock); |
29182176 | 458 | sitn->tunnels_wc[0] = NULL; |
4543c10d | 459 | spin_unlock_bh(&ipip6_lock); |
1da177e4 LT |
460 | dev_put(dev); |
461 | } else { | |
ca8def14 | 462 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 463 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
464 | dev_put(dev); |
465 | } | |
466 | } | |
467 | ||
468 | ||
c73cb5a2 | 469 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 470 | { |
1da177e4 | 471 | |
071f92d0 | 472 | /* All the routers (except for Linux) return only |
1da177e4 LT |
473 | 8 bytes of packet payload. It means, that precise relaying of |
474 | ICMP in the real Internet is absolutely infeasible. | |
475 | */ | |
476 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
477 | const int type = icmp_hdr(skb)->type; |
478 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 479 | struct ip_tunnel *t; |
c73cb5a2 | 480 | int err; |
1da177e4 LT |
481 | |
482 | switch (type) { | |
483 | default: | |
484 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 485 | return 0; |
1da177e4 LT |
486 | |
487 | case ICMP_DEST_UNREACH: | |
488 | switch (code) { | |
489 | case ICMP_SR_FAILED: | |
490 | case ICMP_PORT_UNREACH: | |
491 | /* Impossible event. */ | |
c73cb5a2 | 492 | return 0; |
1da177e4 LT |
493 | case ICMP_FRAG_NEEDED: |
494 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 495 | return 0; |
1da177e4 LT |
496 | default: |
497 | /* All others are translated to HOST_UNREACH. | |
498 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
499 | I believe they are just ether pollution. --ANK | |
500 | */ | |
501 | break; | |
502 | } | |
503 | break; | |
504 | case ICMP_TIME_EXCEEDED: | |
505 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 506 | return 0; |
1da177e4 LT |
507 | break; |
508 | } | |
509 | ||
c73cb5a2 KM |
510 | err = -ENOENT; |
511 | ||
4543c10d | 512 | rcu_read_lock(); |
4fddbf5d SH |
513 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
514 | skb->dev, | |
515 | iph->daddr, | |
516 | iph->saddr); | |
1da177e4 LT |
517 | if (t == NULL || t->parms.iph.daddr == 0) |
518 | goto out; | |
c73cb5a2 KM |
519 | |
520 | err = 0; | |
1da177e4 LT |
521 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
522 | goto out; | |
523 | ||
bb80087a | 524 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
525 | t->err_count++; |
526 | else | |
527 | t->err_count = 1; | |
528 | t->err_time = jiffies; | |
529 | out: | |
4543c10d | 530 | rcu_read_unlock(); |
c73cb5a2 | 531 | return err; |
1da177e4 LT |
532 | } |
533 | ||
534 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
535 | { | |
536 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 537 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
538 | } |
539 | ||
540 | static int ipip6_rcv(struct sk_buff *skb) | |
541 | { | |
542 | struct iphdr *iph; | |
543 | struct ip_tunnel *tunnel; | |
544 | ||
545 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
546 | goto out; | |
547 | ||
eddc9ec5 | 548 | iph = ip_hdr(skb); |
1da177e4 | 549 | |
4543c10d | 550 | rcu_read_lock(); |
4fddbf5d SH |
551 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
552 | iph->saddr, iph->daddr); | |
553 | if (tunnel != NULL) { | |
1da177e4 | 554 | secpath_reset(skb); |
b0e380b1 | 555 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 556 | skb_reset_network_header(skb); |
8cdfab8a | 557 | IPCB(skb)->flags = 0; |
1da177e4 LT |
558 | skb->protocol = htons(ETH_P_IPV6); |
559 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
560 | |
561 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 562 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 563 | tunnel->dev->stats.rx_errors++; |
4543c10d | 564 | rcu_read_unlock(); |
c7dc89c0 FT |
565 | kfree_skb(skb); |
566 | return 0; | |
567 | } | |
4eecc107 PE |
568 | tunnel->dev->stats.rx_packets++; |
569 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 570 | skb->dev = tunnel->dev; |
adf30907 | 571 | skb_dst_drop(skb); |
1da177e4 LT |
572 | nf_reset(skb); |
573 | ipip6_ecn_decapsulate(iph, skb); | |
574 | netif_rx(skb); | |
4543c10d | 575 | rcu_read_unlock(); |
1da177e4 LT |
576 | return 0; |
577 | } | |
578 | ||
45af08be | 579 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
4543c10d | 580 | rcu_read_unlock(); |
1da177e4 | 581 | out: |
36ca34cc | 582 | kfree_skb(skb); |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
fa857afc YH |
586 | /* |
587 | * Returns the embedded IPv4 address if the IPv6 address | |
588 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
589 | */ | |
590 | static inline | |
591 | __be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel) | |
1da177e4 | 592 | { |
e69a4adc | 593 | __be32 dst = 0; |
1da177e4 | 594 | |
fa857afc YH |
595 | #ifdef CONFIG_IPV6_SIT_6RD |
596 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
597 | tunnel->ip6rd.prefixlen)) { | |
598 | unsigned pbw0, pbi0; | |
599 | int pbi1; | |
600 | u32 d; | |
601 | ||
602 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
603 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
604 | ||
e7db38c3 | 605 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
606 | tunnel->ip6rd.relay_prefixlen; |
607 | ||
608 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
609 | if (pbi1 > 0) | |
e7db38c3 | 610 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
611 | (32 - pbi1); |
612 | ||
613 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
614 | } | |
615 | #else | |
1da177e4 | 616 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 617 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
618 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
619 | } | |
fa857afc | 620 | #endif |
1da177e4 LT |
621 | return dst; |
622 | } | |
623 | ||
624 | /* | |
625 | * This function assumes it is being called from dev_queue_xmit() | |
626 | * and that skb is filled properly by that function. | |
627 | */ | |
628 | ||
6fef4c0c SH |
629 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
630 | struct net_device *dev) | |
1da177e4 | 631 | { |
2941a486 | 632 | struct ip_tunnel *tunnel = netdev_priv(dev); |
0bfbedb1 ED |
633 | struct net_device_stats *stats = &dev->stats; |
634 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
1da177e4 | 635 | struct iphdr *tiph = &tunnel->parms.iph; |
0660e03f | 636 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 | 637 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 638 | __be16 df = tiph->frag_off; |
1da177e4 LT |
639 | struct rtable *rt; /* Route to the other host */ |
640 | struct net_device *tdev; /* Device to other host */ | |
641 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 642 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 643 | __be32 dst = tiph->daddr; |
1da177e4 | 644 | int mtu; |
1ab1457c | 645 | struct in6_addr *addr6; |
1da177e4 LT |
646 | int addr_type; |
647 | ||
1da177e4 LT |
648 | if (skb->protocol != htons(ETH_P_IPV6)) |
649 | goto tx_error; | |
650 | ||
c7dc89c0 FT |
651 | /* ISATAP (RFC4214) - must come before 6to4 */ |
652 | if (dev->priv_flags & IFF_ISATAP) { | |
653 | struct neighbour *neigh = NULL; | |
654 | ||
adf30907 ED |
655 | if (skb_dst(skb)) |
656 | neigh = skb_dst(skb)->neighbour; | |
c7dc89c0 FT |
657 | |
658 | if (neigh == NULL) { | |
659 | if (net_ratelimit()) | |
660 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
661 | goto tx_error; | |
662 | } | |
663 | ||
664 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
665 | addr_type = ipv6_addr_type(addr6); | |
666 | ||
667 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
668 | ipv6_addr_is_isatap(addr6)) | |
669 | dst = addr6->s6_addr32[3]; | |
670 | else | |
671 | goto tx_error; | |
672 | } | |
673 | ||
1da177e4 | 674 | if (!dst) |
fa857afc | 675 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
676 | |
677 | if (!dst) { | |
678 | struct neighbour *neigh = NULL; | |
679 | ||
adf30907 ED |
680 | if (skb_dst(skb)) |
681 | neigh = skb_dst(skb)->neighbour; | |
1da177e4 LT |
682 | |
683 | if (neigh == NULL) { | |
684 | if (net_ratelimit()) | |
685 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
686 | goto tx_error; | |
687 | } | |
688 | ||
689 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
690 | addr_type = ipv6_addr_type(addr6); | |
691 | ||
692 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 693 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
694 | addr_type = ipv6_addr_type(addr6); |
695 | } | |
696 | ||
697 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
698 | goto tx_error_icmp; | |
699 | ||
700 | dst = addr6->s6_addr32[3]; | |
701 | } | |
702 | ||
703 | { | |
704 | struct flowi fl = { .nl_u = { .ip4_u = | |
705 | { .daddr = dst, | |
706 | .saddr = tiph->saddr, | |
707 | .tos = RT_TOS(tos) } }, | |
708 | .oif = tunnel->parms.link, | |
709 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 710 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
4eecc107 | 711 | stats->tx_carrier_errors++; |
1da177e4 LT |
712 | goto tx_error_icmp; |
713 | } | |
714 | } | |
715 | if (rt->rt_type != RTN_UNICAST) { | |
716 | ip_rt_put(rt); | |
4eecc107 | 717 | stats->tx_carrier_errors++; |
1da177e4 LT |
718 | goto tx_error_icmp; |
719 | } | |
720 | tdev = rt->u.dst.dev; | |
721 | ||
722 | if (tdev == dev) { | |
723 | ip_rt_put(rt); | |
4eecc107 | 724 | stats->collisions++; |
1da177e4 LT |
725 | goto tx_error; |
726 | } | |
727 | ||
292f4f3c | 728 | if (df) { |
1da177e4 | 729 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); |
1da177e4 | 730 | |
292f4f3c HX |
731 | if (mtu < 68) { |
732 | stats->collisions++; | |
733 | ip_rt_put(rt); | |
734 | goto tx_error; | |
735 | } | |
1da177e4 | 736 | |
292f4f3c HX |
737 | if (mtu < IPV6_MIN_MTU) { |
738 | mtu = IPV6_MIN_MTU; | |
739 | df = 0; | |
740 | } | |
741 | ||
742 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
743 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
744 | ||
745 | if (skb->len > mtu) { | |
3ffe533c | 746 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
747 | ip_rt_put(rt); |
748 | goto tx_error; | |
749 | } | |
1da177e4 LT |
750 | } |
751 | ||
752 | if (tunnel->err_count > 0) { | |
bb80087a WY |
753 | if (time_before(jiffies, |
754 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
755 | tunnel->err_count--; |
756 | dst_link_failure(skb); | |
757 | } else | |
758 | tunnel->err_count = 0; | |
759 | } | |
760 | ||
761 | /* | |
762 | * Okay, now see if we can stuff it in the buffer as-is. | |
763 | */ | |
764 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
765 | ||
cfbba49d PM |
766 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
767 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
768 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
769 | if (!new_skb) { | |
770 | ip_rt_put(rt); | |
0bfbedb1 | 771 | txq->tx_dropped++; |
1da177e4 | 772 | dev_kfree_skb(skb); |
6ed10654 | 773 | return NETDEV_TX_OK; |
1da177e4 LT |
774 | } |
775 | if (skb->sk) | |
776 | skb_set_owner_w(new_skb, skb->sk); | |
777 | dev_kfree_skb(skb); | |
778 | skb = new_skb; | |
0660e03f | 779 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
780 | } |
781 | ||
b0e380b1 | 782 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
783 | skb_push(skb, sizeof(struct iphdr)); |
784 | skb_reset_network_header(skb); | |
1da177e4 | 785 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 786 | IPCB(skb)->flags = 0; |
adf30907 ED |
787 | skb_dst_drop(skb); |
788 | skb_dst_set(skb, &rt->u.dst); | |
1da177e4 LT |
789 | |
790 | /* | |
791 | * Push down and install the IPIP header. | |
792 | */ | |
793 | ||
eddc9ec5 | 794 | iph = ip_hdr(skb); |
1da177e4 LT |
795 | iph->version = 4; |
796 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 797 | iph->frag_off = df; |
1da177e4 LT |
798 | iph->protocol = IPPROTO_IPV6; |
799 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
800 | iph->daddr = rt->rt_dst; | |
801 | iph->saddr = rt->rt_src; | |
802 | ||
803 | if ((iph->ttl = tiph->ttl) == 0) | |
804 | iph->ttl = iph6->hop_limit; | |
805 | ||
806 | nf_reset(skb); | |
807 | ||
808 | IPTUNNEL_XMIT(); | |
6ed10654 | 809 | return NETDEV_TX_OK; |
1da177e4 LT |
810 | |
811 | tx_error_icmp: | |
812 | dst_link_failure(skb); | |
813 | tx_error: | |
814 | stats->tx_errors++; | |
815 | dev_kfree_skb(skb); | |
6ed10654 | 816 | return NETDEV_TX_OK; |
1da177e4 LT |
817 | } |
818 | ||
8a4a50f9 MS |
819 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
820 | { | |
821 | struct net_device *tdev = NULL; | |
822 | struct ip_tunnel *tunnel; | |
823 | struct iphdr *iph; | |
824 | ||
825 | tunnel = netdev_priv(dev); | |
826 | iph = &tunnel->parms.iph; | |
827 | ||
828 | if (iph->daddr) { | |
829 | struct flowi fl = { .nl_u = { .ip4_u = | |
830 | { .daddr = iph->daddr, | |
831 | .saddr = iph->saddr, | |
832 | .tos = RT_TOS(iph->tos) } }, | |
833 | .oif = tunnel->parms.link, | |
834 | .proto = IPPROTO_IPV6 }; | |
835 | struct rtable *rt; | |
907a08c4 | 836 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
837 | tdev = rt->u.dst.dev; |
838 | ip_rt_put(rt); | |
839 | } | |
840 | dev->flags |= IFF_POINTOPOINT; | |
841 | } | |
842 | ||
843 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 844 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
845 | |
846 | if (tdev) { | |
847 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
848 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
849 | if (dev->mtu < IPV6_MIN_MTU) | |
850 | dev->mtu = IPV6_MIN_MTU; | |
851 | } | |
852 | dev->iflink = tunnel->parms.link; | |
853 | } | |
854 | ||
1da177e4 LT |
855 | static int |
856 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
857 | { | |
858 | int err = 0; | |
859 | struct ip_tunnel_parm p; | |
fadf6bf0 | 860 | struct ip_tunnel_prl prl; |
1da177e4 | 861 | struct ip_tunnel *t; |
ca8def14 PE |
862 | struct net *net = dev_net(dev); |
863 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
864 | #ifdef CONFIG_IPV6_SIT_6RD |
865 | struct ip_tunnel_6rd ip6rd; | |
866 | #endif | |
1da177e4 LT |
867 | |
868 | switch (cmd) { | |
869 | case SIOCGETTUNNEL: | |
fa857afc YH |
870 | #ifdef CONFIG_IPV6_SIT_6RD |
871 | case SIOCGET6RD: | |
872 | #endif | |
1da177e4 | 873 | t = NULL; |
cd3dbc19 | 874 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
875 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
876 | err = -EFAULT; | |
877 | break; | |
878 | } | |
ca8def14 | 879 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
880 | } |
881 | if (t == NULL) | |
2941a486 | 882 | t = netdev_priv(dev); |
fa857afc YH |
883 | |
884 | err = -EFAULT; | |
885 | if (cmd == SIOCGETTUNNEL) { | |
886 | memcpy(&p, &t->parms, sizeof(p)); | |
887 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
888 | sizeof(p))) | |
889 | goto done; | |
890 | #ifdef CONFIG_IPV6_SIT_6RD | |
891 | } else { | |
892 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
893 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
894 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
895 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
896 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
897 | sizeof(ip6rd))) | |
898 | goto done; | |
899 | #endif | |
900 | } | |
901 | err = 0; | |
1da177e4 LT |
902 | break; |
903 | ||
904 | case SIOCADDTUNNEL: | |
905 | case SIOCCHGTUNNEL: | |
906 | err = -EPERM; | |
907 | if (!capable(CAP_NET_ADMIN)) | |
908 | goto done; | |
909 | ||
910 | err = -EFAULT; | |
911 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
912 | goto done; | |
913 | ||
914 | err = -EINVAL; | |
915 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
916 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
917 | goto done; | |
918 | if (p.iph.ttl) | |
919 | p.iph.frag_off |= htons(IP_DF); | |
920 | ||
ca8def14 | 921 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 922 | |
cd3dbc19 | 923 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
924 | if (t != NULL) { |
925 | if (t->dev != dev) { | |
926 | err = -EEXIST; | |
927 | break; | |
928 | } | |
929 | } else { | |
930 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
931 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
932 | err = -EINVAL; | |
933 | break; | |
934 | } | |
2941a486 | 935 | t = netdev_priv(dev); |
ca8def14 | 936 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
937 | t->parms.iph.saddr = p.iph.saddr; |
938 | t->parms.iph.daddr = p.iph.daddr; | |
939 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
940 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 941 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
942 | netdev_state_change(dev); |
943 | } | |
944 | } | |
945 | ||
946 | if (t) { | |
947 | err = 0; | |
948 | if (cmd == SIOCCHGTUNNEL) { | |
949 | t->parms.iph.ttl = p.iph.ttl; | |
950 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
951 | if (t->parms.link != p.link) { |
952 | t->parms.link = p.link; | |
953 | ipip6_tunnel_bind_dev(dev); | |
954 | netdev_state_change(dev); | |
955 | } | |
1da177e4 LT |
956 | } |
957 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
958 | err = -EFAULT; | |
959 | } else | |
960 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
961 | break; | |
962 | ||
963 | case SIOCDELTUNNEL: | |
964 | err = -EPERM; | |
965 | if (!capable(CAP_NET_ADMIN)) | |
966 | goto done; | |
967 | ||
cd3dbc19 | 968 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
969 | err = -EFAULT; |
970 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
971 | goto done; | |
972 | err = -ENOENT; | |
ca8def14 | 973 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
974 | goto done; |
975 | err = -EPERM; | |
cd3dbc19 | 976 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
977 | goto done; |
978 | dev = t->dev; | |
979 | } | |
22f8cde5 SH |
980 | unregister_netdevice(dev); |
981 | err = 0; | |
1da177e4 LT |
982 | break; |
983 | ||
300aaeea | 984 | case SIOCGETPRL: |
2b4743bd YH |
985 | err = -EINVAL; |
986 | if (dev == sitn->fb_tunnel_dev) | |
987 | goto done; | |
988 | err = -ENOENT; | |
989 | if (!(t = netdev_priv(dev))) | |
990 | goto done; | |
991 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
992 | break; | |
993 | ||
fadf6bf0 TF |
994 | case SIOCADDPRL: |
995 | case SIOCDELPRL: | |
996 | case SIOCCHGPRL: | |
997 | err = -EPERM; | |
2b4743bd | 998 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
999 | goto done; |
1000 | err = -EINVAL; | |
cd3dbc19 | 1001 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1002 | goto done; |
1003 | err = -EFAULT; | |
1004 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1005 | goto done; | |
1006 | err = -ENOENT; | |
1007 | if (!(t = netdev_priv(dev))) | |
1008 | goto done; | |
1009 | ||
300aaeea | 1010 | switch (cmd) { |
300aaeea | 1011 | case SIOCDELPRL: |
fadf6bf0 | 1012 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1013 | break; |
1014 | case SIOCADDPRL: | |
1015 | case SIOCCHGPRL: | |
fadf6bf0 | 1016 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1017 | break; |
1018 | } | |
2b4743bd | 1019 | netdev_state_change(dev); |
fadf6bf0 TF |
1020 | break; |
1021 | ||
fa857afc YH |
1022 | #ifdef CONFIG_IPV6_SIT_6RD |
1023 | case SIOCADD6RD: | |
1024 | case SIOCCHG6RD: | |
1025 | case SIOCDEL6RD: | |
1026 | err = -EPERM; | |
1027 | if (!capable(CAP_NET_ADMIN)) | |
1028 | goto done; | |
1029 | ||
1030 | err = -EFAULT; | |
1031 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1032 | sizeof(ip6rd))) | |
1033 | goto done; | |
1034 | ||
1035 | t = netdev_priv(dev); | |
1036 | ||
1037 | if (cmd != SIOCDEL6RD) { | |
1038 | struct in6_addr prefix; | |
1039 | __be32 relay_prefix; | |
1040 | ||
1041 | err = -EINVAL; | |
1042 | if (ip6rd.relay_prefixlen > 32 || | |
1043 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1044 | goto done; | |
1045 | ||
1046 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1047 | ip6rd.prefixlen); | |
1048 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1049 | goto done; | |
91b2a3f9 YH |
1050 | if (ip6rd.relay_prefixlen) |
1051 | relay_prefix = ip6rd.relay_prefix & | |
1052 | htonl(0xffffffffUL << | |
1053 | (32 - ip6rd.relay_prefixlen)); | |
1054 | else | |
1055 | relay_prefix = 0; | |
fa857afc YH |
1056 | if (relay_prefix != ip6rd.relay_prefix) |
1057 | goto done; | |
1058 | ||
1059 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1060 | t->ip6rd.relay_prefix = relay_prefix; | |
1061 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1062 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1063 | } else | |
e0c93948 | 1064 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1065 | |
1066 | err = 0; | |
1067 | break; | |
1068 | #endif | |
1069 | ||
1da177e4 LT |
1070 | default: |
1071 | err = -EINVAL; | |
1072 | } | |
1073 | ||
1074 | done: | |
1075 | return err; | |
1076 | } | |
1077 | ||
1da177e4 LT |
1078 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1079 | { | |
1080 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1081 | return -EINVAL; | |
1082 | dev->mtu = new_mtu; | |
1083 | return 0; | |
1084 | } | |
1085 | ||
1326c3d5 SH |
1086 | static const struct net_device_ops ipip6_netdev_ops = { |
1087 | .ndo_uninit = ipip6_tunnel_uninit, | |
1088 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1089 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1090 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1091 | }; | |
1092 | ||
1da177e4 LT |
1093 | static void ipip6_tunnel_setup(struct net_device *dev) |
1094 | { | |
1326c3d5 | 1095 | dev->netdev_ops = &ipip6_netdev_ops; |
1da177e4 | 1096 | dev->destructor = free_netdev; |
1da177e4 LT |
1097 | |
1098 | dev->type = ARPHRD_SIT; | |
1099 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1100 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1101 | dev->flags = IFF_NOARP; |
f2ba025b | 1102 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1103 | dev->iflink = 0; |
1104 | dev->addr_len = 4; | |
7a97146c | 1105 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1106 | } |
1107 | ||
1326c3d5 | 1108 | static void ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1109 | { |
1326c3d5 | 1110 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1111 | |
1112 | tunnel->dev = dev; | |
1113 | strcpy(tunnel->parms.name, dev->name); | |
1114 | ||
1115 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1116 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1117 | ||
8a4a50f9 | 1118 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1119 | } |
1120 | ||
2c8c1e72 | 1121 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1122 | { |
2941a486 | 1123 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1124 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1125 | struct net *net = dev_net(dev); |
1126 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1127 | |
1128 | tunnel->dev = dev; | |
1129 | strcpy(tunnel->parms.name, dev->name); | |
1130 | ||
1131 | iph->version = 4; | |
1132 | iph->protocol = IPPROTO_IPV6; | |
1133 | iph->ihl = 5; | |
1134 | iph->ttl = 64; | |
1135 | ||
1136 | dev_hold(dev); | |
29182176 | 1137 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1138 | } |
1139 | ||
c73cb5a2 | 1140 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1141 | .handler = ipip6_rcv, |
1142 | .err_handler = ipip6_err, | |
c73cb5a2 | 1143 | .priority = 1, |
1da177e4 LT |
1144 | }; |
1145 | ||
2c8c1e72 | 1146 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1147 | { |
1148 | int prio; | |
1149 | ||
1150 | for (prio = 1; prio < 4; prio++) { | |
1151 | int h; | |
1152 | for (h = 0; h < HASH_SIZE; h++) { | |
62808f91 ED |
1153 | struct ip_tunnel *t = sitn->tunnels[prio][h]; |
1154 | ||
1155 | while (t != NULL) { | |
1156 | unregister_netdevice_queue(t->dev, head); | |
1157 | t = t->next; | |
1158 | } | |
db44575f AK |
1159 | } |
1160 | } | |
1161 | } | |
1162 | ||
2c8c1e72 | 1163 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1164 | { |
67101172 | 1165 | struct sit_net *sitn = net_generic(net, sit_net_id); |
8190d900 | 1166 | int err; |
8190d900 | 1167 | |
29182176 PE |
1168 | sitn->tunnels[0] = sitn->tunnels_wc; |
1169 | sitn->tunnels[1] = sitn->tunnels_l; | |
1170 | sitn->tunnels[2] = sitn->tunnels_r; | |
1171 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1172 | ||
cd3dbc19 PE |
1173 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1174 | ipip6_tunnel_setup); | |
1175 | if (!sitn->fb_tunnel_dev) { | |
1176 | err = -ENOMEM; | |
1177 | goto err_alloc_dev; | |
1178 | } | |
be77e593 | 1179 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1180 | |
1326c3d5 | 1181 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
e0c93948 | 1182 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1183 | |
1184 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1185 | goto err_reg_dev; | |
1186 | ||
8190d900 PE |
1187 | return 0; |
1188 | ||
cd3dbc19 | 1189 | err_reg_dev: |
1326c3d5 | 1190 | dev_put(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1191 | free_netdev(sitn->fb_tunnel_dev); |
1192 | err_alloc_dev: | |
8190d900 PE |
1193 | return err; |
1194 | } | |
1195 | ||
2c8c1e72 | 1196 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1197 | { |
67101172 | 1198 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1199 | LIST_HEAD(list); |
8190d900 | 1200 | |
cd3dbc19 | 1201 | rtnl_lock(); |
62808f91 ED |
1202 | sit_destroy_tunnels(sitn, &list); |
1203 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1204 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1205 | rtnl_unlock(); |
8190d900 PE |
1206 | } |
1207 | ||
1208 | static struct pernet_operations sit_net_ops = { | |
1209 | .init = sit_init_net, | |
1210 | .exit = sit_exit_net, | |
67101172 EB |
1211 | .id = &sit_net_id, |
1212 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1213 | }; |
1214 | ||
89c89458 | 1215 | static void __exit sit_cleanup(void) |
1da177e4 | 1216 | { |
c73cb5a2 | 1217 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1218 | |
67101172 | 1219 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1220 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1221 | } |
1222 | ||
89c89458 | 1223 | static int __init sit_init(void) |
1da177e4 LT |
1224 | { |
1225 | int err; | |
1226 | ||
1227 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1228 | ||
67101172 | 1229 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1230 | if (err < 0) |
d5aa407f AD |
1231 | return err; |
1232 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1233 | if (err < 0) { | |
1234 | unregister_pernet_device(&sit_net_ops); | |
1235 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
1236 | } | |
1da177e4 | 1237 | return err; |
1da177e4 | 1238 | } |
989e5b96 JR |
1239 | |
1240 | module_init(sit_init); | |
1241 | module_exit(sit_cleanup); | |
39c85086 | 1242 | MODULE_LICENSE("GPL"); |
daccff02 | 1243 | MODULE_ALIAS("sit0"); |