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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 SH |
65 | static void ipip6_fb_tunnel_init(struct net_device *dev); |
66 | static void ipip6_tunnel_init(struct net_device *dev); | |
1da177e4 LT |
67 | static void ipip6_tunnel_setup(struct net_device *dev); |
68 | ||
f99189b1 | 69 | static int sit_net_id __read_mostly; |
8190d900 | 70 | struct sit_net { |
29182176 PE |
71 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
72 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
73 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
74 | struct ip_tunnel *tunnels_wc[1]; | |
75 | struct ip_tunnel **tunnels[4]; | |
76 | ||
cd3dbc19 | 77 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
78 | }; |
79 | ||
4543c10d ED |
80 | /* |
81 | * Locking : hash tables are protected by RCU and a spinlock | |
82 | */ | |
83 | static DEFINE_SPINLOCK(ipip6_lock); | |
84 | ||
85 | #define for_each_ip_tunnel_rcu(start) \ | |
86 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 87 | |
4543c10d ED |
88 | /* |
89 | * Must be invoked with rcu_read_lock | |
90 | */ | |
ca8def14 | 91 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 92 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 LT |
93 | { |
94 | unsigned h0 = HASH(remote); | |
95 | unsigned h1 = HASH(local); | |
96 | struct ip_tunnel *t; | |
29182176 | 97 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 98 | |
4543c10d | 99 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 100 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
101 | remote == t->parms.iph.daddr && |
102 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
103 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
104 | return t; |
105 | } | |
4543c10d | 106 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { |
4fddbf5d SH |
107 | if (remote == t->parms.iph.daddr && |
108 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
109 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
110 | return t; |
111 | } | |
4543c10d | 112 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { |
4fddbf5d SH |
113 | if (local == t->parms.iph.saddr && |
114 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
115 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
116 | return t; |
117 | } | |
4543c10d | 118 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 119 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
120 | return t; |
121 | return NULL; | |
122 | } | |
123 | ||
ca8def14 PE |
124 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
125 | struct ip_tunnel_parm *parms) | |
1da177e4 | 126 | { |
420fe234 YH |
127 | __be32 remote = parms->iph.daddr; |
128 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
129 | unsigned h = 0; |
130 | int prio = 0; | |
131 | ||
132 | if (remote) { | |
133 | prio |= 2; | |
134 | h ^= HASH(remote); | |
135 | } | |
136 | if (local) { | |
137 | prio |= 1; | |
138 | h ^= HASH(local); | |
139 | } | |
29182176 | 140 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
141 | } |
142 | ||
ca8def14 PE |
143 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
144 | struct ip_tunnel *t) | |
420fe234 | 145 | { |
ca8def14 | 146 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
147 | } |
148 | ||
ca8def14 | 149 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
150 | { |
151 | struct ip_tunnel **tp; | |
152 | ||
ca8def14 | 153 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 | 154 | if (t == *tp) { |
4543c10d | 155 | spin_lock_bh(&ipip6_lock); |
1da177e4 | 156 | *tp = t->next; |
4543c10d | 157 | spin_unlock_bh(&ipip6_lock); |
1da177e4 LT |
158 | break; |
159 | } | |
160 | } | |
161 | } | |
162 | ||
ca8def14 | 163 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 164 | { |
ca8def14 | 165 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 | 166 | |
4543c10d | 167 | spin_lock_bh(&ipip6_lock); |
1da177e4 | 168 | t->next = *tp; |
4543c10d ED |
169 | rcu_assign_pointer(*tp, t); |
170 | spin_unlock_bh(&ipip6_lock); | |
1da177e4 LT |
171 | } |
172 | ||
e0c93948 | 173 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
174 | { |
175 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
176 | struct ip_tunnel *t = netdev_priv(dev); |
177 | ||
fa857afc YH |
178 | if (t->dev == sitn->fb_tunnel_dev) { |
179 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
180 | t->ip6rd.relay_prefix = 0; | |
181 | t->ip6rd.prefixlen = 16; | |
182 | t->ip6rd.relay_prefixlen = 0; | |
183 | } else { | |
184 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
185 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
186 | } | |
187 | #endif | |
188 | } | |
189 | ||
ca8def14 PE |
190 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
191 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 192 | { |
e69a4adc AV |
193 | __be32 remote = parms->iph.daddr; |
194 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
195 | struct ip_tunnel *t, **tp, *nt; |
196 | struct net_device *dev; | |
1da177e4 | 197 | char name[IFNAMSIZ]; |
ca8def14 | 198 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 199 | |
ca8def14 | 200 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
8db99e57 | 201 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
202 | remote == t->parms.iph.daddr && |
203 | parms->link == t->parms.link) { | |
8db99e57 SH |
204 | if (create) |
205 | return NULL; | |
206 | else | |
207 | return t; | |
208 | } | |
1da177e4 LT |
209 | } |
210 | if (!create) | |
211 | goto failed; | |
212 | ||
213 | if (parms->name[0]) | |
214 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
215 | else |
216 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
217 | |
218 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
219 | if (dev == NULL) | |
220 | return NULL; | |
221 | ||
7a97146c PE |
222 | dev_net_set(dev, net); |
223 | ||
b37d428b PE |
224 | if (strchr(name, '%')) { |
225 | if (dev_alloc_name(dev, name) < 0) | |
226 | goto failed_free; | |
227 | } | |
228 | ||
2941a486 | 229 | nt = netdev_priv(dev); |
1326c3d5 | 230 | |
1da177e4 | 231 | nt->parms = *parms; |
1b1d8f73 | 232 | ipip6_tunnel_init(dev); |
e0c93948 | 233 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 234 | |
c7dc89c0 FT |
235 | if (parms->i_flags & SIT_ISATAP) |
236 | dev->priv_flags |= IFF_ISATAP; | |
237 | ||
b37d428b PE |
238 | if (register_netdevice(dev) < 0) |
239 | goto failed_free; | |
1da177e4 LT |
240 | |
241 | dev_hold(dev); | |
242 | ||
ca8def14 | 243 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
244 | return nt; |
245 | ||
b37d428b PE |
246 | failed_free: |
247 | free_netdev(dev); | |
1da177e4 LT |
248 | failed: |
249 | return NULL; | |
250 | } | |
251 | ||
ef9a9d11 ED |
252 | static DEFINE_SPINLOCK(ipip6_prl_lock); |
253 | ||
254 | #define for_each_prl_rcu(start) \ | |
255 | for (prl = rcu_dereference(start); \ | |
256 | prl; \ | |
257 | prl = rcu_dereference(prl->next)) | |
258 | ||
fadf6bf0 | 259 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 260 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 261 | { |
ef9a9d11 | 262 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 263 | |
ef9a9d11 ED |
264 | for_each_prl_rcu(t->prl) |
265 | if (prl->addr == addr) | |
fadf6bf0 | 266 | break; |
ef9a9d11 | 267 | return prl; |
fadf6bf0 TF |
268 | |
269 | } | |
270 | ||
2b4743bd YH |
271 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
272 | struct ip_tunnel_prl __user *a) | |
300aaeea | 273 | { |
2b4743bd | 274 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
275 | struct ip_tunnel_prl_entry *prl; |
276 | unsigned int cmax, c = 0, ca, len; | |
277 | int ret = 0; | |
278 | ||
2b4743bd YH |
279 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
280 | return -EFAULT; | |
281 | cmax = kprl.datalen / sizeof(kprl); | |
282 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
283 | cmax = 1; |
284 | ||
285 | /* For simple GET or for root users, | |
286 | * we try harder to allocate. | |
287 | */ | |
288 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
289 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
290 | NULL; | |
291 | ||
ef9a9d11 | 292 | rcu_read_lock(); |
300aaeea YH |
293 | |
294 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
295 | ||
296 | if (!kp) { | |
297 | /* We don't try hard to allocate much memory for | |
298 | * non-root users. | |
299 | * For root users, retry allocating enough memory for | |
300 | * the answer. | |
301 | */ | |
302 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
303 | if (!kp) { | |
304 | ret = -ENOMEM; | |
305 | goto out; | |
306 | } | |
307 | } | |
308 | ||
309 | c = 0; | |
ef9a9d11 | 310 | for_each_prl_rcu(t->prl) { |
298bf12d | 311 | if (c >= cmax) |
300aaeea | 312 | break; |
2b4743bd | 313 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
314 | continue; |
315 | kp[c].addr = prl->addr; | |
316 | kp[c].flags = prl->flags; | |
317 | c++; | |
2b4743bd | 318 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
319 | break; |
320 | } | |
321 | out: | |
ef9a9d11 | 322 | rcu_read_unlock(); |
300aaeea YH |
323 | |
324 | len = sizeof(*kp) * c; | |
2b4743bd YH |
325 | ret = 0; |
326 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
327 | ret = -EFAULT; | |
300aaeea YH |
328 | |
329 | kfree(kp); | |
300aaeea | 330 | |
2b4743bd | 331 | return ret; |
300aaeea YH |
332 | } |
333 | ||
fadf6bf0 TF |
334 | static int |
335 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
336 | { | |
337 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
338 | int err = 0; |
339 | ||
0009ae1f YH |
340 | if (a->addr == htonl(INADDR_ANY)) |
341 | return -EINVAL; | |
342 | ||
ef9a9d11 | 343 | spin_lock(&ipip6_prl_lock); |
fadf6bf0 TF |
344 | |
345 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 346 | if (p->addr == a->addr) { |
ef9a9d11 ED |
347 | if (chg) { |
348 | p->flags = a->flags; | |
349 | goto out; | |
350 | } | |
3fcfa129 YH |
351 | err = -EEXIST; |
352 | goto out; | |
fadf6bf0 TF |
353 | } |
354 | } | |
355 | ||
3fcfa129 YH |
356 | if (chg) { |
357 | err = -ENXIO; | |
358 | goto out; | |
359 | } | |
fadf6bf0 TF |
360 | |
361 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
362 | if (!p) { |
363 | err = -ENOBUFS; | |
364 | goto out; | |
365 | } | |
fadf6bf0 | 366 | |
ef9a9d11 | 367 | INIT_RCU_HEAD(&p->rcu_head); |
fadf6bf0 | 368 | p->next = t->prl; |
300aaeea YH |
369 | p->addr = a->addr; |
370 | p->flags = a->flags; | |
ef9a9d11 ED |
371 | t->prl_count++; |
372 | rcu_assign_pointer(t->prl, p); | |
3fcfa129 | 373 | out: |
ef9a9d11 | 374 | spin_unlock(&ipip6_prl_lock); |
3fcfa129 | 375 | return err; |
fadf6bf0 TF |
376 | } |
377 | ||
ef9a9d11 ED |
378 | static void prl_entry_destroy_rcu(struct rcu_head *head) |
379 | { | |
380 | kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head)); | |
381 | } | |
382 | ||
383 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
384 | { | |
385 | struct ip_tunnel_prl_entry *p, *n; | |
386 | ||
387 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
388 | do { | |
389 | n = p->next; | |
390 | kfree(p); | |
391 | p = n; | |
392 | } while (p); | |
393 | } | |
394 | ||
fadf6bf0 TF |
395 | static int |
396 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
397 | { | |
398 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
399 | int err = 0; |
400 | ||
ef9a9d11 | 401 | spin_lock(&ipip6_prl_lock); |
fadf6bf0 | 402 | |
0009ae1f | 403 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 404 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 405 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
406 | x = *p; |
407 | *p = x->next; | |
ef9a9d11 | 408 | call_rcu(&x->rcu_head, prl_entry_destroy_rcu); |
300aaeea | 409 | t->prl_count--; |
3fcfa129 | 410 | goto out; |
fadf6bf0 TF |
411 | } |
412 | } | |
3fcfa129 | 413 | err = -ENXIO; |
fadf6bf0 | 414 | } else { |
ef9a9d11 ED |
415 | if (t->prl) { |
416 | t->prl_count = 0; | |
fadf6bf0 | 417 | x = t->prl; |
ef9a9d11 ED |
418 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
419 | t->prl = NULL; | |
fadf6bf0 TF |
420 | } |
421 | } | |
3fcfa129 | 422 | out: |
ef9a9d11 | 423 | spin_unlock(&ipip6_prl_lock); |
4b279601 | 424 | return err; |
fadf6bf0 TF |
425 | } |
426 | ||
fadf6bf0 TF |
427 | static int |
428 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
429 | { | |
3fcfa129 | 430 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
431 | int ok = 1; |
432 | ||
ef9a9d11 | 433 | rcu_read_lock(); |
3fcfa129 | 434 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 435 | if (p) { |
300aaeea | 436 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
437 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
438 | else | |
439 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
440 | } else { | |
441 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
442 | if (ipv6_addr_is_isatap(addr6) && | |
443 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 444 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
445 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
446 | else | |
447 | ok = 0; | |
448 | } | |
ef9a9d11 | 449 | rcu_read_unlock(); |
fadf6bf0 TF |
450 | return ok; |
451 | } | |
452 | ||
1da177e4 LT |
453 | static void ipip6_tunnel_uninit(struct net_device *dev) |
454 | { | |
ca8def14 PE |
455 | struct net *net = dev_net(dev); |
456 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
457 | ||
cd3dbc19 | 458 | if (dev == sitn->fb_tunnel_dev) { |
4543c10d | 459 | spin_lock_bh(&ipip6_lock); |
29182176 | 460 | sitn->tunnels_wc[0] = NULL; |
4543c10d | 461 | spin_unlock_bh(&ipip6_lock); |
1da177e4 LT |
462 | dev_put(dev); |
463 | } else { | |
ca8def14 | 464 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 465 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
466 | dev_put(dev); |
467 | } | |
468 | } | |
469 | ||
470 | ||
c73cb5a2 | 471 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 472 | { |
1da177e4 | 473 | |
071f92d0 | 474 | /* All the routers (except for Linux) return only |
1da177e4 LT |
475 | 8 bytes of packet payload. It means, that precise relaying of |
476 | ICMP in the real Internet is absolutely infeasible. | |
477 | */ | |
478 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
479 | const int type = icmp_hdr(skb)->type; |
480 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 481 | struct ip_tunnel *t; |
c73cb5a2 | 482 | int err; |
1da177e4 LT |
483 | |
484 | switch (type) { | |
485 | default: | |
486 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 487 | return 0; |
1da177e4 LT |
488 | |
489 | case ICMP_DEST_UNREACH: | |
490 | switch (code) { | |
491 | case ICMP_SR_FAILED: | |
492 | case ICMP_PORT_UNREACH: | |
493 | /* Impossible event. */ | |
c73cb5a2 | 494 | return 0; |
1da177e4 LT |
495 | case ICMP_FRAG_NEEDED: |
496 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 497 | return 0; |
1da177e4 LT |
498 | default: |
499 | /* All others are translated to HOST_UNREACH. | |
500 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
501 | I believe they are just ether pollution. --ANK | |
502 | */ | |
503 | break; | |
504 | } | |
505 | break; | |
506 | case ICMP_TIME_EXCEEDED: | |
507 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 508 | return 0; |
1da177e4 LT |
509 | break; |
510 | } | |
511 | ||
c73cb5a2 KM |
512 | err = -ENOENT; |
513 | ||
4543c10d | 514 | rcu_read_lock(); |
4fddbf5d SH |
515 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
516 | skb->dev, | |
517 | iph->daddr, | |
518 | iph->saddr); | |
1da177e4 LT |
519 | if (t == NULL || t->parms.iph.daddr == 0) |
520 | goto out; | |
c73cb5a2 KM |
521 | |
522 | err = 0; | |
1da177e4 LT |
523 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
524 | goto out; | |
525 | ||
bb80087a | 526 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
527 | t->err_count++; |
528 | else | |
529 | t->err_count = 1; | |
530 | t->err_time = jiffies; | |
531 | out: | |
4543c10d | 532 | rcu_read_unlock(); |
c73cb5a2 | 533 | return err; |
1da177e4 LT |
534 | } |
535 | ||
536 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
537 | { | |
538 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 539 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
540 | } |
541 | ||
542 | static int ipip6_rcv(struct sk_buff *skb) | |
543 | { | |
544 | struct iphdr *iph; | |
545 | struct ip_tunnel *tunnel; | |
546 | ||
547 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
548 | goto out; | |
549 | ||
eddc9ec5 | 550 | iph = ip_hdr(skb); |
1da177e4 | 551 | |
4543c10d | 552 | rcu_read_lock(); |
4fddbf5d SH |
553 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
554 | iph->saddr, iph->daddr); | |
555 | if (tunnel != NULL) { | |
1da177e4 | 556 | secpath_reset(skb); |
b0e380b1 | 557 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 558 | skb_reset_network_header(skb); |
8cdfab8a | 559 | IPCB(skb)->flags = 0; |
1da177e4 LT |
560 | skb->protocol = htons(ETH_P_IPV6); |
561 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
562 | |
563 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 564 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 565 | tunnel->dev->stats.rx_errors++; |
4543c10d | 566 | rcu_read_unlock(); |
c7dc89c0 FT |
567 | kfree_skb(skb); |
568 | return 0; | |
569 | } | |
4eecc107 PE |
570 | tunnel->dev->stats.rx_packets++; |
571 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 572 | skb->dev = tunnel->dev; |
adf30907 | 573 | skb_dst_drop(skb); |
1da177e4 LT |
574 | nf_reset(skb); |
575 | ipip6_ecn_decapsulate(iph, skb); | |
576 | netif_rx(skb); | |
4543c10d | 577 | rcu_read_unlock(); |
1da177e4 LT |
578 | return 0; |
579 | } | |
580 | ||
45af08be | 581 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
4543c10d | 582 | rcu_read_unlock(); |
1da177e4 | 583 | out: |
36ca34cc | 584 | kfree_skb(skb); |
1da177e4 LT |
585 | return 0; |
586 | } | |
587 | ||
fa857afc YH |
588 | /* |
589 | * Returns the embedded IPv4 address if the IPv6 address | |
590 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
591 | */ | |
592 | static inline | |
593 | __be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel) | |
1da177e4 | 594 | { |
e69a4adc | 595 | __be32 dst = 0; |
1da177e4 | 596 | |
fa857afc YH |
597 | #ifdef CONFIG_IPV6_SIT_6RD |
598 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
599 | tunnel->ip6rd.prefixlen)) { | |
600 | unsigned pbw0, pbi0; | |
601 | int pbi1; | |
602 | u32 d; | |
603 | ||
604 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
605 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
606 | ||
e7db38c3 | 607 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
608 | tunnel->ip6rd.relay_prefixlen; |
609 | ||
610 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
611 | if (pbi1 > 0) | |
e7db38c3 | 612 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
613 | (32 - pbi1); |
614 | ||
615 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
616 | } | |
617 | #else | |
1da177e4 | 618 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 619 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
620 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
621 | } | |
fa857afc | 622 | #endif |
1da177e4 LT |
623 | return dst; |
624 | } | |
625 | ||
626 | /* | |
627 | * This function assumes it is being called from dev_queue_xmit() | |
628 | * and that skb is filled properly by that function. | |
629 | */ | |
630 | ||
6fef4c0c SH |
631 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
632 | struct net_device *dev) | |
1da177e4 | 633 | { |
2941a486 | 634 | struct ip_tunnel *tunnel = netdev_priv(dev); |
0bfbedb1 ED |
635 | struct net_device_stats *stats = &dev->stats; |
636 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
1da177e4 | 637 | struct iphdr *tiph = &tunnel->parms.iph; |
0660e03f | 638 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 | 639 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 640 | __be16 df = tiph->frag_off; |
1da177e4 LT |
641 | struct rtable *rt; /* Route to the other host */ |
642 | struct net_device *tdev; /* Device to other host */ | |
643 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 644 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 645 | __be32 dst = tiph->daddr; |
1da177e4 | 646 | int mtu; |
1ab1457c | 647 | struct in6_addr *addr6; |
1da177e4 LT |
648 | int addr_type; |
649 | ||
1da177e4 LT |
650 | if (skb->protocol != htons(ETH_P_IPV6)) |
651 | goto tx_error; | |
652 | ||
c7dc89c0 FT |
653 | /* ISATAP (RFC4214) - must come before 6to4 */ |
654 | if (dev->priv_flags & IFF_ISATAP) { | |
655 | struct neighbour *neigh = NULL; | |
656 | ||
adf30907 ED |
657 | if (skb_dst(skb)) |
658 | neigh = skb_dst(skb)->neighbour; | |
c7dc89c0 FT |
659 | |
660 | if (neigh == NULL) { | |
661 | if (net_ratelimit()) | |
662 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
663 | goto tx_error; | |
664 | } | |
665 | ||
666 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
667 | addr_type = ipv6_addr_type(addr6); | |
668 | ||
669 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
670 | ipv6_addr_is_isatap(addr6)) | |
671 | dst = addr6->s6_addr32[3]; | |
672 | else | |
673 | goto tx_error; | |
674 | } | |
675 | ||
1da177e4 | 676 | if (!dst) |
fa857afc | 677 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
678 | |
679 | if (!dst) { | |
680 | struct neighbour *neigh = NULL; | |
681 | ||
adf30907 ED |
682 | if (skb_dst(skb)) |
683 | neigh = skb_dst(skb)->neighbour; | |
1da177e4 LT |
684 | |
685 | if (neigh == NULL) { | |
686 | if (net_ratelimit()) | |
687 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
688 | goto tx_error; | |
689 | } | |
690 | ||
691 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
692 | addr_type = ipv6_addr_type(addr6); | |
693 | ||
694 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 695 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
696 | addr_type = ipv6_addr_type(addr6); |
697 | } | |
698 | ||
699 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
700 | goto tx_error_icmp; | |
701 | ||
702 | dst = addr6->s6_addr32[3]; | |
703 | } | |
704 | ||
705 | { | |
706 | struct flowi fl = { .nl_u = { .ip4_u = | |
707 | { .daddr = dst, | |
708 | .saddr = tiph->saddr, | |
709 | .tos = RT_TOS(tos) } }, | |
710 | .oif = tunnel->parms.link, | |
711 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 712 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
4eecc107 | 713 | stats->tx_carrier_errors++; |
1da177e4 LT |
714 | goto tx_error_icmp; |
715 | } | |
716 | } | |
717 | if (rt->rt_type != RTN_UNICAST) { | |
718 | ip_rt_put(rt); | |
4eecc107 | 719 | stats->tx_carrier_errors++; |
1da177e4 LT |
720 | goto tx_error_icmp; |
721 | } | |
722 | tdev = rt->u.dst.dev; | |
723 | ||
724 | if (tdev == dev) { | |
725 | ip_rt_put(rt); | |
4eecc107 | 726 | stats->collisions++; |
1da177e4 LT |
727 | goto tx_error; |
728 | } | |
729 | ||
292f4f3c | 730 | if (df) { |
1da177e4 | 731 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); |
1da177e4 | 732 | |
292f4f3c HX |
733 | if (mtu < 68) { |
734 | stats->collisions++; | |
735 | ip_rt_put(rt); | |
736 | goto tx_error; | |
737 | } | |
1da177e4 | 738 | |
292f4f3c HX |
739 | if (mtu < IPV6_MIN_MTU) { |
740 | mtu = IPV6_MIN_MTU; | |
741 | df = 0; | |
742 | } | |
743 | ||
744 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
745 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
746 | ||
747 | if (skb->len > mtu) { | |
748 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
749 | ip_rt_put(rt); | |
750 | goto tx_error; | |
751 | } | |
1da177e4 LT |
752 | } |
753 | ||
754 | if (tunnel->err_count > 0) { | |
bb80087a WY |
755 | if (time_before(jiffies, |
756 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
757 | tunnel->err_count--; |
758 | dst_link_failure(skb); | |
759 | } else | |
760 | tunnel->err_count = 0; | |
761 | } | |
762 | ||
763 | /* | |
764 | * Okay, now see if we can stuff it in the buffer as-is. | |
765 | */ | |
766 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
767 | ||
cfbba49d PM |
768 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
769 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
770 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
771 | if (!new_skb) { | |
772 | ip_rt_put(rt); | |
0bfbedb1 | 773 | txq->tx_dropped++; |
1da177e4 | 774 | dev_kfree_skb(skb); |
6ed10654 | 775 | return NETDEV_TX_OK; |
1da177e4 LT |
776 | } |
777 | if (skb->sk) | |
778 | skb_set_owner_w(new_skb, skb->sk); | |
779 | dev_kfree_skb(skb); | |
780 | skb = new_skb; | |
0660e03f | 781 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
782 | } |
783 | ||
b0e380b1 | 784 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
785 | skb_push(skb, sizeof(struct iphdr)); |
786 | skb_reset_network_header(skb); | |
1da177e4 | 787 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 788 | IPCB(skb)->flags = 0; |
adf30907 ED |
789 | skb_dst_drop(skb); |
790 | skb_dst_set(skb, &rt->u.dst); | |
1da177e4 LT |
791 | |
792 | /* | |
793 | * Push down and install the IPIP header. | |
794 | */ | |
795 | ||
eddc9ec5 | 796 | iph = ip_hdr(skb); |
1da177e4 LT |
797 | iph->version = 4; |
798 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 799 | iph->frag_off = df; |
1da177e4 LT |
800 | iph->protocol = IPPROTO_IPV6; |
801 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
802 | iph->daddr = rt->rt_dst; | |
803 | iph->saddr = rt->rt_src; | |
804 | ||
805 | if ((iph->ttl = tiph->ttl) == 0) | |
806 | iph->ttl = iph6->hop_limit; | |
807 | ||
808 | nf_reset(skb); | |
809 | ||
810 | IPTUNNEL_XMIT(); | |
6ed10654 | 811 | return NETDEV_TX_OK; |
1da177e4 LT |
812 | |
813 | tx_error_icmp: | |
814 | dst_link_failure(skb); | |
815 | tx_error: | |
816 | stats->tx_errors++; | |
817 | dev_kfree_skb(skb); | |
6ed10654 | 818 | return NETDEV_TX_OK; |
1da177e4 LT |
819 | } |
820 | ||
8a4a50f9 MS |
821 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
822 | { | |
823 | struct net_device *tdev = NULL; | |
824 | struct ip_tunnel *tunnel; | |
825 | struct iphdr *iph; | |
826 | ||
827 | tunnel = netdev_priv(dev); | |
828 | iph = &tunnel->parms.iph; | |
829 | ||
830 | if (iph->daddr) { | |
831 | struct flowi fl = { .nl_u = { .ip4_u = | |
832 | { .daddr = iph->daddr, | |
833 | .saddr = iph->saddr, | |
834 | .tos = RT_TOS(iph->tos) } }, | |
835 | .oif = tunnel->parms.link, | |
836 | .proto = IPPROTO_IPV6 }; | |
837 | struct rtable *rt; | |
907a08c4 | 838 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
839 | tdev = rt->u.dst.dev; |
840 | ip_rt_put(rt); | |
841 | } | |
842 | dev->flags |= IFF_POINTOPOINT; | |
843 | } | |
844 | ||
845 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 846 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
847 | |
848 | if (tdev) { | |
849 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
850 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
851 | if (dev->mtu < IPV6_MIN_MTU) | |
852 | dev->mtu = IPV6_MIN_MTU; | |
853 | } | |
854 | dev->iflink = tunnel->parms.link; | |
855 | } | |
856 | ||
1da177e4 LT |
857 | static int |
858 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
859 | { | |
860 | int err = 0; | |
861 | struct ip_tunnel_parm p; | |
fadf6bf0 | 862 | struct ip_tunnel_prl prl; |
1da177e4 | 863 | struct ip_tunnel *t; |
ca8def14 PE |
864 | struct net *net = dev_net(dev); |
865 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
866 | #ifdef CONFIG_IPV6_SIT_6RD |
867 | struct ip_tunnel_6rd ip6rd; | |
868 | #endif | |
1da177e4 LT |
869 | |
870 | switch (cmd) { | |
871 | case SIOCGETTUNNEL: | |
fa857afc YH |
872 | #ifdef CONFIG_IPV6_SIT_6RD |
873 | case SIOCGET6RD: | |
874 | #endif | |
1da177e4 | 875 | t = NULL; |
cd3dbc19 | 876 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
877 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
878 | err = -EFAULT; | |
879 | break; | |
880 | } | |
ca8def14 | 881 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
882 | } |
883 | if (t == NULL) | |
2941a486 | 884 | t = netdev_priv(dev); |
fa857afc YH |
885 | |
886 | err = -EFAULT; | |
887 | if (cmd == SIOCGETTUNNEL) { | |
888 | memcpy(&p, &t->parms, sizeof(p)); | |
889 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
890 | sizeof(p))) | |
891 | goto done; | |
892 | #ifdef CONFIG_IPV6_SIT_6RD | |
893 | } else { | |
894 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
895 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
896 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
897 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
898 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
899 | sizeof(ip6rd))) | |
900 | goto done; | |
901 | #endif | |
902 | } | |
903 | err = 0; | |
1da177e4 LT |
904 | break; |
905 | ||
906 | case SIOCADDTUNNEL: | |
907 | case SIOCCHGTUNNEL: | |
908 | err = -EPERM; | |
909 | if (!capable(CAP_NET_ADMIN)) | |
910 | goto done; | |
911 | ||
912 | err = -EFAULT; | |
913 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
914 | goto done; | |
915 | ||
916 | err = -EINVAL; | |
917 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
918 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
919 | goto done; | |
920 | if (p.iph.ttl) | |
921 | p.iph.frag_off |= htons(IP_DF); | |
922 | ||
ca8def14 | 923 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 924 | |
cd3dbc19 | 925 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
926 | if (t != NULL) { |
927 | if (t->dev != dev) { | |
928 | err = -EEXIST; | |
929 | break; | |
930 | } | |
931 | } else { | |
932 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
933 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
934 | err = -EINVAL; | |
935 | break; | |
936 | } | |
2941a486 | 937 | t = netdev_priv(dev); |
ca8def14 | 938 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
939 | t->parms.iph.saddr = p.iph.saddr; |
940 | t->parms.iph.daddr = p.iph.daddr; | |
941 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
942 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 943 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
944 | netdev_state_change(dev); |
945 | } | |
946 | } | |
947 | ||
948 | if (t) { | |
949 | err = 0; | |
950 | if (cmd == SIOCCHGTUNNEL) { | |
951 | t->parms.iph.ttl = p.iph.ttl; | |
952 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
953 | if (t->parms.link != p.link) { |
954 | t->parms.link = p.link; | |
955 | ipip6_tunnel_bind_dev(dev); | |
956 | netdev_state_change(dev); | |
957 | } | |
1da177e4 LT |
958 | } |
959 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
960 | err = -EFAULT; | |
961 | } else | |
962 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
963 | break; | |
964 | ||
965 | case SIOCDELTUNNEL: | |
966 | err = -EPERM; | |
967 | if (!capable(CAP_NET_ADMIN)) | |
968 | goto done; | |
969 | ||
cd3dbc19 | 970 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
971 | err = -EFAULT; |
972 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
973 | goto done; | |
974 | err = -ENOENT; | |
ca8def14 | 975 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
976 | goto done; |
977 | err = -EPERM; | |
cd3dbc19 | 978 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
979 | goto done; |
980 | dev = t->dev; | |
981 | } | |
22f8cde5 SH |
982 | unregister_netdevice(dev); |
983 | err = 0; | |
1da177e4 LT |
984 | break; |
985 | ||
300aaeea | 986 | case SIOCGETPRL: |
2b4743bd YH |
987 | err = -EINVAL; |
988 | if (dev == sitn->fb_tunnel_dev) | |
989 | goto done; | |
990 | err = -ENOENT; | |
991 | if (!(t = netdev_priv(dev))) | |
992 | goto done; | |
993 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
994 | break; | |
995 | ||
fadf6bf0 TF |
996 | case SIOCADDPRL: |
997 | case SIOCDELPRL: | |
998 | case SIOCCHGPRL: | |
999 | err = -EPERM; | |
2b4743bd | 1000 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1001 | goto done; |
1002 | err = -EINVAL; | |
cd3dbc19 | 1003 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1004 | goto done; |
1005 | err = -EFAULT; | |
1006 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1007 | goto done; | |
1008 | err = -ENOENT; | |
1009 | if (!(t = netdev_priv(dev))) | |
1010 | goto done; | |
1011 | ||
300aaeea | 1012 | switch (cmd) { |
300aaeea | 1013 | case SIOCDELPRL: |
fadf6bf0 | 1014 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1015 | break; |
1016 | case SIOCADDPRL: | |
1017 | case SIOCCHGPRL: | |
fadf6bf0 | 1018 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1019 | break; |
1020 | } | |
2b4743bd | 1021 | netdev_state_change(dev); |
fadf6bf0 TF |
1022 | break; |
1023 | ||
fa857afc YH |
1024 | #ifdef CONFIG_IPV6_SIT_6RD |
1025 | case SIOCADD6RD: | |
1026 | case SIOCCHG6RD: | |
1027 | case SIOCDEL6RD: | |
1028 | err = -EPERM; | |
1029 | if (!capable(CAP_NET_ADMIN)) | |
1030 | goto done; | |
1031 | ||
1032 | err = -EFAULT; | |
1033 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1034 | sizeof(ip6rd))) | |
1035 | goto done; | |
1036 | ||
1037 | t = netdev_priv(dev); | |
1038 | ||
1039 | if (cmd != SIOCDEL6RD) { | |
1040 | struct in6_addr prefix; | |
1041 | __be32 relay_prefix; | |
1042 | ||
1043 | err = -EINVAL; | |
1044 | if (ip6rd.relay_prefixlen > 32 || | |
1045 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1046 | goto done; | |
1047 | ||
1048 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1049 | ip6rd.prefixlen); | |
1050 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1051 | goto done; | |
91b2a3f9 YH |
1052 | if (ip6rd.relay_prefixlen) |
1053 | relay_prefix = ip6rd.relay_prefix & | |
1054 | htonl(0xffffffffUL << | |
1055 | (32 - ip6rd.relay_prefixlen)); | |
1056 | else | |
1057 | relay_prefix = 0; | |
fa857afc YH |
1058 | if (relay_prefix != ip6rd.relay_prefix) |
1059 | goto done; | |
1060 | ||
1061 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1062 | t->ip6rd.relay_prefix = relay_prefix; | |
1063 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1064 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1065 | } else | |
e0c93948 | 1066 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1067 | |
1068 | err = 0; | |
1069 | break; | |
1070 | #endif | |
1071 | ||
1da177e4 LT |
1072 | default: |
1073 | err = -EINVAL; | |
1074 | } | |
1075 | ||
1076 | done: | |
1077 | return err; | |
1078 | } | |
1079 | ||
1da177e4 LT |
1080 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1081 | { | |
1082 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1083 | return -EINVAL; | |
1084 | dev->mtu = new_mtu; | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1326c3d5 SH |
1088 | static const struct net_device_ops ipip6_netdev_ops = { |
1089 | .ndo_uninit = ipip6_tunnel_uninit, | |
1090 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1091 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1092 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1093 | }; | |
1094 | ||
1da177e4 LT |
1095 | static void ipip6_tunnel_setup(struct net_device *dev) |
1096 | { | |
1326c3d5 | 1097 | dev->netdev_ops = &ipip6_netdev_ops; |
1da177e4 | 1098 | dev->destructor = free_netdev; |
1da177e4 LT |
1099 | |
1100 | dev->type = ARPHRD_SIT; | |
1101 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1102 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1103 | dev->flags = IFF_NOARP; |
f2ba025b | 1104 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1105 | dev->iflink = 0; |
1106 | dev->addr_len = 4; | |
7a97146c | 1107 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1108 | } |
1109 | ||
1326c3d5 | 1110 | static void ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1111 | { |
1326c3d5 | 1112 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1113 | |
1114 | tunnel->dev = dev; | |
1115 | strcpy(tunnel->parms.name, dev->name); | |
1116 | ||
1117 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1118 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1119 | ||
8a4a50f9 | 1120 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1121 | } |
1122 | ||
1326c3d5 | 1123 | static void ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1124 | { |
2941a486 | 1125 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1126 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1127 | struct net *net = dev_net(dev); |
1128 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1129 | |
1130 | tunnel->dev = dev; | |
1131 | strcpy(tunnel->parms.name, dev->name); | |
1132 | ||
1133 | iph->version = 4; | |
1134 | iph->protocol = IPPROTO_IPV6; | |
1135 | iph->ihl = 5; | |
1136 | iph->ttl = 64; | |
1137 | ||
1138 | dev_hold(dev); | |
29182176 | 1139 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1140 | } |
1141 | ||
c73cb5a2 | 1142 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1143 | .handler = ipip6_rcv, |
1144 | .err_handler = ipip6_err, | |
c73cb5a2 | 1145 | .priority = 1, |
1da177e4 LT |
1146 | }; |
1147 | ||
62808f91 | 1148 | static void sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1149 | { |
1150 | int prio; | |
1151 | ||
1152 | for (prio = 1; prio < 4; prio++) { | |
1153 | int h; | |
1154 | for (h = 0; h < HASH_SIZE; h++) { | |
62808f91 ED |
1155 | struct ip_tunnel *t = sitn->tunnels[prio][h]; |
1156 | ||
1157 | while (t != NULL) { | |
1158 | unregister_netdevice_queue(t->dev, head); | |
1159 | t = t->next; | |
1160 | } | |
db44575f AK |
1161 | } |
1162 | } | |
1163 | } | |
1164 | ||
8190d900 PE |
1165 | static int sit_init_net(struct net *net) |
1166 | { | |
67101172 | 1167 | struct sit_net *sitn = net_generic(net, sit_net_id); |
8190d900 | 1168 | int err; |
8190d900 | 1169 | |
29182176 PE |
1170 | sitn->tunnels[0] = sitn->tunnels_wc; |
1171 | sitn->tunnels[1] = sitn->tunnels_l; | |
1172 | sitn->tunnels[2] = sitn->tunnels_r; | |
1173 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1174 | ||
cd3dbc19 PE |
1175 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1176 | ipip6_tunnel_setup); | |
1177 | if (!sitn->fb_tunnel_dev) { | |
1178 | err = -ENOMEM; | |
1179 | goto err_alloc_dev; | |
1180 | } | |
be77e593 | 1181 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1182 | |
1326c3d5 | 1183 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
e0c93948 | 1184 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1185 | |
1186 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1187 | goto err_reg_dev; | |
1188 | ||
8190d900 PE |
1189 | return 0; |
1190 | ||
cd3dbc19 | 1191 | err_reg_dev: |
1326c3d5 | 1192 | dev_put(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1193 | free_netdev(sitn->fb_tunnel_dev); |
1194 | err_alloc_dev: | |
8190d900 PE |
1195 | return err; |
1196 | } | |
1197 | ||
1198 | static void sit_exit_net(struct net *net) | |
1199 | { | |
67101172 | 1200 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1201 | LIST_HEAD(list); |
8190d900 | 1202 | |
cd3dbc19 | 1203 | rtnl_lock(); |
62808f91 ED |
1204 | sit_destroy_tunnels(sitn, &list); |
1205 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1206 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1207 | rtnl_unlock(); |
8190d900 PE |
1208 | } |
1209 | ||
1210 | static struct pernet_operations sit_net_ops = { | |
1211 | .init = sit_init_net, | |
1212 | .exit = sit_exit_net, | |
67101172 EB |
1213 | .id = &sit_net_id, |
1214 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1215 | }; |
1216 | ||
89c89458 | 1217 | static void __exit sit_cleanup(void) |
1da177e4 | 1218 | { |
c73cb5a2 | 1219 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1220 | |
67101172 | 1221 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1222 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1223 | } |
1224 | ||
89c89458 | 1225 | static int __init sit_init(void) |
1da177e4 LT |
1226 | { |
1227 | int err; | |
1228 | ||
1229 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1230 | ||
c73cb5a2 | 1231 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1232 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1233 | return -EAGAIN; | |
1234 | } | |
1235 | ||
67101172 | 1236 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1237 | if (err < 0) |
cd3dbc19 | 1238 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1239 | |
1da177e4 | 1240 | return err; |
1da177e4 | 1241 | } |
989e5b96 JR |
1242 | |
1243 | module_init(sit_init); | |
1244 | module_exit(sit_cleanup); | |
39c85086 | 1245 | MODULE_LICENSE("GPL"); |
daccff02 | 1246 | MODULE_ALIAS("sit0"); |