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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 |
64506929 | 18 | * Sascha Hlusiak <mail@saschahlusiak.de>: stateless autoconf for isatap |
1da177e4 LT |
19 | */ |
20 | ||
1da177e4 | 21 | #include <linux/module.h> |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/errno.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/socket.h> | |
26 | #include <linux/sockios.h> | |
1da177e4 LT |
27 | #include <linux/net.h> |
28 | #include <linux/in6.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/icmp.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 35 | #include <linux/if_ether.h> |
1da177e4 LT |
36 | |
37 | #include <net/sock.h> | |
38 | #include <net/snmp.h> | |
39 | ||
40 | #include <net/ipv6.h> | |
41 | #include <net/protocol.h> | |
42 | #include <net/transp_v6.h> | |
43 | #include <net/ip6_fib.h> | |
44 | #include <net/ip6_route.h> | |
45 | #include <net/ndisc.h> | |
46 | #include <net/addrconf.h> | |
47 | #include <net/ip.h> | |
48 | #include <net/udp.h> | |
49 | #include <net/icmp.h> | |
50 | #include <net/ipip.h> | |
51 | #include <net/inet_ecn.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/dsfield.h> | |
8190d900 PE |
54 | #include <net/net_namespace.h> |
55 | #include <net/netns/generic.h> | |
1da177e4 LT |
56 | |
57 | /* | |
58 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
59 | ||
60 | For comments look at net/ipv4/ip_gre.c --ANK | |
61 | */ | |
62 | ||
63 | #define HASH_SIZE 16 | |
e69a4adc | 64 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 65 | |
1326c3d5 SH |
66 | static void ipip6_fb_tunnel_init(struct net_device *dev); |
67 | static void ipip6_tunnel_init(struct net_device *dev); | |
1da177e4 LT |
68 | static void ipip6_tunnel_setup(struct net_device *dev); |
69 | ||
8190d900 PE |
70 | static int sit_net_id; |
71 | struct sit_net { | |
29182176 PE |
72 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
73 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
74 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
75 | struct ip_tunnel *tunnels_wc[1]; | |
76 | struct ip_tunnel **tunnels[4]; | |
77 | ||
cd3dbc19 | 78 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
79 | }; |
80 | ||
1da177e4 LT |
81 | static DEFINE_RWLOCK(ipip6_lock); |
82 | ||
ca8def14 | 83 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 84 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 LT |
85 | { |
86 | unsigned h0 = HASH(remote); | |
87 | unsigned h1 = HASH(local); | |
88 | struct ip_tunnel *t; | |
29182176 | 89 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 90 | |
29182176 | 91 | for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 | 92 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
93 | remote == t->parms.iph.daddr && |
94 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
95 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
96 | return t; |
97 | } | |
29182176 | 98 | for (t = sitn->tunnels_r[h0]; t; t = t->next) { |
4fddbf5d SH |
99 | if (remote == t->parms.iph.daddr && |
100 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
101 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
102 | return t; |
103 | } | |
29182176 | 104 | for (t = sitn->tunnels_l[h1]; t; t = t->next) { |
4fddbf5d SH |
105 | if (local == t->parms.iph.saddr && |
106 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
107 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
108 | return t; |
109 | } | |
4fddbf5d SH |
110 | t = sitn->tunnels_wc[0]; |
111 | if ((t != NULL) && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
112 | return t; |
113 | return NULL; | |
114 | } | |
115 | ||
ca8def14 PE |
116 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
117 | struct ip_tunnel_parm *parms) | |
1da177e4 | 118 | { |
420fe234 YH |
119 | __be32 remote = parms->iph.daddr; |
120 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
121 | unsigned h = 0; |
122 | int prio = 0; | |
123 | ||
124 | if (remote) { | |
125 | prio |= 2; | |
126 | h ^= HASH(remote); | |
127 | } | |
128 | if (local) { | |
129 | prio |= 1; | |
130 | h ^= HASH(local); | |
131 | } | |
29182176 | 132 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
133 | } |
134 | ||
ca8def14 PE |
135 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
136 | struct ip_tunnel *t) | |
420fe234 | 137 | { |
ca8def14 | 138 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
139 | } |
140 | ||
ca8def14 | 141 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
142 | { |
143 | struct ip_tunnel **tp; | |
144 | ||
ca8def14 | 145 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
146 | if (t == *tp) { |
147 | write_lock_bh(&ipip6_lock); | |
148 | *tp = t->next; | |
149 | write_unlock_bh(&ipip6_lock); | |
150 | break; | |
151 | } | |
152 | } | |
153 | } | |
154 | ||
ca8def14 | 155 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 156 | { |
ca8def14 | 157 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 LT |
158 | |
159 | t->next = *tp; | |
160 | write_lock_bh(&ipip6_lock); | |
161 | *tp = t; | |
162 | write_unlock_bh(&ipip6_lock); | |
163 | } | |
164 | ||
ca8def14 PE |
165 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
166 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 167 | { |
e69a4adc AV |
168 | __be32 remote = parms->iph.daddr; |
169 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
170 | struct ip_tunnel *t, **tp, *nt; |
171 | struct net_device *dev; | |
1da177e4 | 172 | char name[IFNAMSIZ]; |
ca8def14 | 173 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 174 | |
ca8def14 | 175 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
8db99e57 | 176 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
177 | remote == t->parms.iph.daddr && |
178 | parms->link == t->parms.link) { | |
8db99e57 SH |
179 | if (create) |
180 | return NULL; | |
181 | else | |
182 | return t; | |
183 | } | |
1da177e4 LT |
184 | } |
185 | if (!create) | |
186 | goto failed; | |
187 | ||
188 | if (parms->name[0]) | |
189 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
190 | else |
191 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
192 | |
193 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
194 | if (dev == NULL) | |
195 | return NULL; | |
196 | ||
7a97146c PE |
197 | dev_net_set(dev, net); |
198 | ||
b37d428b PE |
199 | if (strchr(name, '%')) { |
200 | if (dev_alloc_name(dev, name) < 0) | |
201 | goto failed_free; | |
202 | } | |
203 | ||
2941a486 | 204 | nt = netdev_priv(dev); |
1326c3d5 | 205 | |
1da177e4 | 206 | nt->parms = *parms; |
1b1d8f73 | 207 | ipip6_tunnel_init(dev); |
1da177e4 | 208 | |
c7dc89c0 FT |
209 | if (parms->i_flags & SIT_ISATAP) |
210 | dev->priv_flags |= IFF_ISATAP; | |
211 | ||
b37d428b PE |
212 | if (register_netdevice(dev) < 0) |
213 | goto failed_free; | |
1da177e4 LT |
214 | |
215 | dev_hold(dev); | |
216 | ||
ca8def14 | 217 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
218 | return nt; |
219 | ||
b37d428b PE |
220 | failed_free: |
221 | free_netdev(dev); | |
1da177e4 LT |
222 | failed: |
223 | return NULL; | |
224 | } | |
225 | ||
64506929 SH |
226 | static void ipip6_tunnel_rs_timer(unsigned long data) |
227 | { | |
228 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *) data; | |
229 | struct inet6_dev *ifp; | |
230 | struct inet6_ifaddr *addr; | |
231 | ||
232 | spin_lock(&p->lock); | |
233 | ifp = __in6_dev_get(p->tunnel->dev); | |
234 | ||
235 | read_lock_bh(&ifp->lock); | |
236 | for (addr = ifp->addr_list; addr; addr = addr->if_next) { | |
237 | struct in6_addr rtr; | |
238 | ||
239 | if (!(ipv6_addr_type(&addr->addr) & IPV6_ADDR_LINKLOCAL)) | |
240 | continue; | |
241 | ||
242 | /* Send RS to guessed linklocal address of router | |
243 | * | |
244 | * Better: send to ff02::2 encapsuled in unicast directly | |
245 | * to router-v4 instead of guessing the v6 address. | |
246 | * | |
247 | * Cisco/Windows seem to not set the u/l bit correctly, | |
248 | * so we won't guess right. | |
249 | */ | |
250 | ipv6_addr_set(&rtr, htonl(0xFE800000), 0, 0, 0); | |
251 | if (!__ipv6_isatap_ifid(rtr.s6_addr + 8, | |
252 | p->addr)) { | |
253 | ndisc_send_rs(p->tunnel->dev, &addr->addr, &rtr); | |
254 | } | |
255 | } | |
256 | read_unlock_bh(&ifp->lock); | |
257 | ||
258 | mod_timer(&p->rs_timer, jiffies + HZ * p->rs_delay); | |
259 | spin_unlock(&p->lock); | |
260 | ||
261 | return; | |
262 | } | |
263 | ||
fadf6bf0 | 264 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 265 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
266 | { |
267 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
268 | ||
269 | for (p = t->prl; p; p = p->next) | |
300aaeea | 270 | if (p->addr == addr) |
fadf6bf0 TF |
271 | break; |
272 | return p; | |
273 | ||
274 | } | |
275 | ||
2b4743bd YH |
276 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
277 | struct ip_tunnel_prl __user *a) | |
300aaeea | 278 | { |
2b4743bd | 279 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
280 | struct ip_tunnel_prl_entry *prl; |
281 | unsigned int cmax, c = 0, ca, len; | |
282 | int ret = 0; | |
283 | ||
2b4743bd YH |
284 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
285 | return -EFAULT; | |
286 | cmax = kprl.datalen / sizeof(kprl); | |
287 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
288 | cmax = 1; |
289 | ||
290 | /* For simple GET or for root users, | |
291 | * we try harder to allocate. | |
292 | */ | |
293 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
294 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
295 | NULL; | |
296 | ||
297 | read_lock(&ipip6_lock); | |
298 | ||
299 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
300 | ||
301 | if (!kp) { | |
302 | /* We don't try hard to allocate much memory for | |
303 | * non-root users. | |
304 | * For root users, retry allocating enough memory for | |
305 | * the answer. | |
306 | */ | |
307 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
308 | if (!kp) { | |
309 | ret = -ENOMEM; | |
310 | goto out; | |
311 | } | |
312 | } | |
313 | ||
314 | c = 0; | |
315 | for (prl = t->prl; prl; prl = prl->next) { | |
316 | if (c > cmax) | |
317 | break; | |
2b4743bd | 318 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
319 | continue; |
320 | kp[c].addr = prl->addr; | |
321 | kp[c].flags = prl->flags; | |
64506929 | 322 | kp[c].rs_delay = prl->rs_delay; |
300aaeea | 323 | c++; |
2b4743bd | 324 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
325 | break; |
326 | } | |
327 | out: | |
328 | read_unlock(&ipip6_lock); | |
329 | ||
330 | len = sizeof(*kp) * c; | |
2b4743bd YH |
331 | ret = 0; |
332 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
333 | ret = -EFAULT; | |
300aaeea YH |
334 | |
335 | kfree(kp); | |
300aaeea | 336 | |
2b4743bd | 337 | return ret; |
300aaeea YH |
338 | } |
339 | ||
fadf6bf0 TF |
340 | static int |
341 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
342 | { | |
343 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
344 | int err = 0; |
345 | ||
0009ae1f YH |
346 | if (a->addr == htonl(INADDR_ANY)) |
347 | return -EINVAL; | |
348 | ||
3fcfa129 | 349 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
350 | |
351 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 352 | if (p->addr == a->addr) { |
3fcfa129 YH |
353 | if (chg) |
354 | goto update; | |
355 | err = -EEXIST; | |
356 | goto out; | |
fadf6bf0 TF |
357 | } |
358 | } | |
359 | ||
3fcfa129 YH |
360 | if (chg) { |
361 | err = -ENXIO; | |
362 | goto out; | |
363 | } | |
fadf6bf0 TF |
364 | |
365 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
366 | if (!p) { |
367 | err = -ENOBUFS; | |
368 | goto out; | |
369 | } | |
fadf6bf0 | 370 | |
fadf6bf0 | 371 | p->next = t->prl; |
64506929 | 372 | p->tunnel = t; |
fadf6bf0 | 373 | t->prl = p; |
300aaeea | 374 | t->prl_count++; |
64506929 SH |
375 | |
376 | spin_lock_init(&p->lock); | |
377 | setup_timer(&p->rs_timer, ipip6_tunnel_rs_timer, (unsigned long) p); | |
3fcfa129 | 378 | update: |
300aaeea YH |
379 | p->addr = a->addr; |
380 | p->flags = a->flags; | |
64506929 SH |
381 | p->rs_delay = a->rs_delay; |
382 | if (p->rs_delay == 0) | |
383 | p->rs_delay = IPTUNNEL_RS_DEFAULT_DELAY; | |
384 | spin_lock(&p->lock); | |
385 | del_timer(&p->rs_timer); | |
386 | if (p->flags & PRL_DEFAULT) | |
387 | mod_timer(&p->rs_timer, jiffies + 1); | |
388 | spin_unlock(&p->lock); | |
3fcfa129 YH |
389 | out: |
390 | write_unlock(&ipip6_lock); | |
391 | return err; | |
fadf6bf0 TF |
392 | } |
393 | ||
394 | static int | |
395 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
396 | { | |
397 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
398 | int err = 0; |
399 | ||
400 | write_lock(&ipip6_lock); | |
fadf6bf0 | 401 | |
0009ae1f | 402 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 403 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 404 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
405 | x = *p; |
406 | *p = x->next; | |
64506929 SH |
407 | spin_lock(&x->lock); |
408 | del_timer(&x->rs_timer); | |
409 | spin_unlock(&x->lock); | |
fadf6bf0 | 410 | kfree(x); |
300aaeea | 411 | t->prl_count--; |
3fcfa129 | 412 | goto out; |
fadf6bf0 TF |
413 | } |
414 | } | |
3fcfa129 | 415 | err = -ENXIO; |
fadf6bf0 TF |
416 | } else { |
417 | while (t->prl) { | |
418 | x = t->prl; | |
419 | t->prl = t->prl->next; | |
64506929 SH |
420 | spin_lock(&x->lock); |
421 | del_timer(&x->rs_timer); | |
422 | spin_unlock(&x->lock); | |
fadf6bf0 | 423 | kfree(x); |
300aaeea | 424 | t->prl_count--; |
fadf6bf0 TF |
425 | } |
426 | } | |
3fcfa129 YH |
427 | out: |
428 | write_unlock(&ipip6_lock); | |
4b279601 | 429 | return err; |
fadf6bf0 TF |
430 | } |
431 | ||
fadf6bf0 TF |
432 | static int |
433 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
434 | { | |
3fcfa129 | 435 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
436 | int ok = 1; |
437 | ||
3fcfa129 YH |
438 | read_lock(&ipip6_lock); |
439 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 440 | if (p) { |
300aaeea | 441 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
442 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
443 | else | |
444 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
445 | } else { | |
446 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
447 | if (ipv6_addr_is_isatap(addr6) && | |
448 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 449 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
450 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
451 | else | |
452 | ok = 0; | |
453 | } | |
3fcfa129 | 454 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
455 | return ok; |
456 | } | |
457 | ||
1da177e4 LT |
458 | static void ipip6_tunnel_uninit(struct net_device *dev) |
459 | { | |
ca8def14 PE |
460 | struct net *net = dev_net(dev); |
461 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
462 | ||
cd3dbc19 | 463 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 | 464 | write_lock_bh(&ipip6_lock); |
29182176 | 465 | sitn->tunnels_wc[0] = NULL; |
1da177e4 LT |
466 | write_unlock_bh(&ipip6_lock); |
467 | dev_put(dev); | |
468 | } else { | |
ca8def14 | 469 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 470 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
471 | dev_put(dev); |
472 | } | |
473 | } | |
474 | ||
475 | ||
c73cb5a2 | 476 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 477 | { |
1da177e4 | 478 | |
071f92d0 | 479 | /* All the routers (except for Linux) return only |
1da177e4 LT |
480 | 8 bytes of packet payload. It means, that precise relaying of |
481 | ICMP in the real Internet is absolutely infeasible. | |
482 | */ | |
483 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
484 | const int type = icmp_hdr(skb)->type; |
485 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 486 | struct ip_tunnel *t; |
c73cb5a2 | 487 | int err; |
1da177e4 LT |
488 | |
489 | switch (type) { | |
490 | default: | |
491 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 492 | return 0; |
1da177e4 LT |
493 | |
494 | case ICMP_DEST_UNREACH: | |
495 | switch (code) { | |
496 | case ICMP_SR_FAILED: | |
497 | case ICMP_PORT_UNREACH: | |
498 | /* Impossible event. */ | |
c73cb5a2 | 499 | return 0; |
1da177e4 LT |
500 | case ICMP_FRAG_NEEDED: |
501 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 502 | return 0; |
1da177e4 LT |
503 | default: |
504 | /* All others are translated to HOST_UNREACH. | |
505 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
506 | I believe they are just ether pollution. --ANK | |
507 | */ | |
508 | break; | |
509 | } | |
510 | break; | |
511 | case ICMP_TIME_EXCEEDED: | |
512 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 513 | return 0; |
1da177e4 LT |
514 | break; |
515 | } | |
516 | ||
c73cb5a2 KM |
517 | err = -ENOENT; |
518 | ||
1da177e4 | 519 | read_lock(&ipip6_lock); |
4fddbf5d SH |
520 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
521 | skb->dev, | |
522 | iph->daddr, | |
523 | iph->saddr); | |
1da177e4 LT |
524 | if (t == NULL || t->parms.iph.daddr == 0) |
525 | goto out; | |
c73cb5a2 KM |
526 | |
527 | err = 0; | |
1da177e4 LT |
528 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
529 | goto out; | |
530 | ||
bb80087a | 531 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
532 | t->err_count++; |
533 | else | |
534 | t->err_count = 1; | |
535 | t->err_time = jiffies; | |
536 | out: | |
537 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 538 | return err; |
1da177e4 LT |
539 | } |
540 | ||
541 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
542 | { | |
543 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 544 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
545 | } |
546 | ||
547 | static int ipip6_rcv(struct sk_buff *skb) | |
548 | { | |
549 | struct iphdr *iph; | |
550 | struct ip_tunnel *tunnel; | |
551 | ||
552 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
553 | goto out; | |
554 | ||
eddc9ec5 | 555 | iph = ip_hdr(skb); |
1da177e4 LT |
556 | |
557 | read_lock(&ipip6_lock); | |
4fddbf5d SH |
558 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
559 | iph->saddr, iph->daddr); | |
560 | if (tunnel != NULL) { | |
1da177e4 | 561 | secpath_reset(skb); |
b0e380b1 | 562 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 563 | skb_reset_network_header(skb); |
8cdfab8a | 564 | IPCB(skb)->flags = 0; |
1da177e4 LT |
565 | skb->protocol = htons(ETH_P_IPV6); |
566 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
567 | |
568 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 569 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 570 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
571 | read_unlock(&ipip6_lock); |
572 | kfree_skb(skb); | |
573 | return 0; | |
574 | } | |
4eecc107 PE |
575 | tunnel->dev->stats.rx_packets++; |
576 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 577 | skb->dev = tunnel->dev; |
adf30907 | 578 | skb_dst_drop(skb); |
1da177e4 LT |
579 | nf_reset(skb); |
580 | ipip6_ecn_decapsulate(iph, skb); | |
581 | netif_rx(skb); | |
582 | read_unlock(&ipip6_lock); | |
583 | return 0; | |
584 | } | |
585 | ||
45af08be | 586 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
587 | read_unlock(&ipip6_lock); |
588 | out: | |
36ca34cc | 589 | kfree_skb(skb); |
1da177e4 LT |
590 | return 0; |
591 | } | |
592 | ||
593 | /* Returns the embedded IPv4 address if the IPv6 address | |
594 | comes from 6to4 (RFC 3056) addr space */ | |
595 | ||
e69a4adc | 596 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 597 | { |
e69a4adc | 598 | __be32 dst = 0; |
1da177e4 LT |
599 | |
600 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 601 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
602 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
603 | } | |
604 | return dst; | |
605 | } | |
606 | ||
607 | /* | |
608 | * This function assumes it is being called from dev_queue_xmit() | |
609 | * and that skb is filled properly by that function. | |
610 | */ | |
611 | ||
612 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
613 | { | |
2941a486 | 614 | struct ip_tunnel *tunnel = netdev_priv(dev); |
4eecc107 | 615 | struct net_device_stats *stats = &tunnel->dev->stats; |
1da177e4 | 616 | struct iphdr *tiph = &tunnel->parms.iph; |
0660e03f | 617 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
618 | u8 tos = tunnel->parms.iph.tos; |
619 | struct rtable *rt; /* Route to the other host */ | |
620 | struct net_device *tdev; /* Device to other host */ | |
621 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 622 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 623 | __be32 dst = tiph->daddr; |
1da177e4 | 624 | int mtu; |
1ab1457c | 625 | struct in6_addr *addr6; |
1da177e4 LT |
626 | int addr_type; |
627 | ||
628 | if (tunnel->recursion++) { | |
4eecc107 | 629 | stats->collisions++; |
1da177e4 LT |
630 | goto tx_error; |
631 | } | |
632 | ||
633 | if (skb->protocol != htons(ETH_P_IPV6)) | |
634 | goto tx_error; | |
635 | ||
c7dc89c0 FT |
636 | /* ISATAP (RFC4214) - must come before 6to4 */ |
637 | if (dev->priv_flags & IFF_ISATAP) { | |
638 | struct neighbour *neigh = NULL; | |
639 | ||
adf30907 ED |
640 | if (skb_dst(skb)) |
641 | neigh = skb_dst(skb)->neighbour; | |
c7dc89c0 FT |
642 | |
643 | if (neigh == NULL) { | |
644 | if (net_ratelimit()) | |
645 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
646 | goto tx_error; | |
647 | } | |
648 | ||
649 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
650 | addr_type = ipv6_addr_type(addr6); | |
651 | ||
652 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
653 | ipv6_addr_is_isatap(addr6)) | |
654 | dst = addr6->s6_addr32[3]; | |
655 | else | |
656 | goto tx_error; | |
657 | } | |
658 | ||
1da177e4 LT |
659 | if (!dst) |
660 | dst = try_6to4(&iph6->daddr); | |
661 | ||
662 | if (!dst) { | |
663 | struct neighbour *neigh = NULL; | |
664 | ||
adf30907 ED |
665 | if (skb_dst(skb)) |
666 | neigh = skb_dst(skb)->neighbour; | |
1da177e4 LT |
667 | |
668 | if (neigh == NULL) { | |
669 | if (net_ratelimit()) | |
670 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
671 | goto tx_error; | |
672 | } | |
673 | ||
674 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
675 | addr_type = ipv6_addr_type(addr6); | |
676 | ||
677 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 678 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
679 | addr_type = ipv6_addr_type(addr6); |
680 | } | |
681 | ||
682 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
683 | goto tx_error_icmp; | |
684 | ||
685 | dst = addr6->s6_addr32[3]; | |
686 | } | |
687 | ||
688 | { | |
689 | struct flowi fl = { .nl_u = { .ip4_u = | |
690 | { .daddr = dst, | |
691 | .saddr = tiph->saddr, | |
692 | .tos = RT_TOS(tos) } }, | |
693 | .oif = tunnel->parms.link, | |
694 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 695 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
4eecc107 | 696 | stats->tx_carrier_errors++; |
1da177e4 LT |
697 | goto tx_error_icmp; |
698 | } | |
699 | } | |
700 | if (rt->rt_type != RTN_UNICAST) { | |
701 | ip_rt_put(rt); | |
4eecc107 | 702 | stats->tx_carrier_errors++; |
1da177e4 LT |
703 | goto tx_error_icmp; |
704 | } | |
705 | tdev = rt->u.dst.dev; | |
706 | ||
707 | if (tdev == dev) { | |
708 | ip_rt_put(rt); | |
4eecc107 | 709 | stats->collisions++; |
1da177e4 LT |
710 | goto tx_error; |
711 | } | |
712 | ||
713 | if (tiph->frag_off) | |
714 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
715 | else | |
adf30907 | 716 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 LT |
717 | |
718 | if (mtu < 68) { | |
4eecc107 | 719 | stats->collisions++; |
1da177e4 LT |
720 | ip_rt_put(rt); |
721 | goto tx_error; | |
722 | } | |
723 | if (mtu < IPV6_MIN_MTU) | |
724 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
725 | if (tunnel->parms.iph.daddr && skb_dst(skb)) |
726 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
727 | |
728 | if (skb->len > mtu) { | |
729 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
730 | ip_rt_put(rt); | |
731 | goto tx_error; | |
732 | } | |
733 | ||
734 | if (tunnel->err_count > 0) { | |
bb80087a WY |
735 | if (time_before(jiffies, |
736 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
737 | tunnel->err_count--; |
738 | dst_link_failure(skb); | |
739 | } else | |
740 | tunnel->err_count = 0; | |
741 | } | |
742 | ||
743 | /* | |
744 | * Okay, now see if we can stuff it in the buffer as-is. | |
745 | */ | |
746 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
747 | ||
cfbba49d PM |
748 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
749 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
750 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
751 | if (!new_skb) { | |
752 | ip_rt_put(rt); | |
1ab1457c | 753 | stats->tx_dropped++; |
1da177e4 LT |
754 | dev_kfree_skb(skb); |
755 | tunnel->recursion--; | |
756 | return 0; | |
757 | } | |
758 | if (skb->sk) | |
759 | skb_set_owner_w(new_skb, skb->sk); | |
760 | dev_kfree_skb(skb); | |
761 | skb = new_skb; | |
0660e03f | 762 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
763 | } |
764 | ||
b0e380b1 | 765 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
766 | skb_push(skb, sizeof(struct iphdr)); |
767 | skb_reset_network_header(skb); | |
1da177e4 | 768 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 769 | IPCB(skb)->flags = 0; |
adf30907 ED |
770 | skb_dst_drop(skb); |
771 | skb_dst_set(skb, &rt->u.dst); | |
1da177e4 LT |
772 | |
773 | /* | |
774 | * Push down and install the IPIP header. | |
775 | */ | |
776 | ||
eddc9ec5 | 777 | iph = ip_hdr(skb); |
1da177e4 LT |
778 | iph->version = 4; |
779 | iph->ihl = sizeof(struct iphdr)>>2; | |
780 | if (mtu > IPV6_MIN_MTU) | |
781 | iph->frag_off = htons(IP_DF); | |
782 | else | |
783 | iph->frag_off = 0; | |
784 | ||
785 | iph->protocol = IPPROTO_IPV6; | |
786 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
787 | iph->daddr = rt->rt_dst; | |
788 | iph->saddr = rt->rt_src; | |
789 | ||
790 | if ((iph->ttl = tiph->ttl) == 0) | |
791 | iph->ttl = iph6->hop_limit; | |
792 | ||
793 | nf_reset(skb); | |
794 | ||
795 | IPTUNNEL_XMIT(); | |
796 | tunnel->recursion--; | |
797 | return 0; | |
798 | ||
799 | tx_error_icmp: | |
800 | dst_link_failure(skb); | |
801 | tx_error: | |
802 | stats->tx_errors++; | |
803 | dev_kfree_skb(skb); | |
804 | tunnel->recursion--; | |
805 | return 0; | |
806 | } | |
807 | ||
8a4a50f9 MS |
808 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
809 | { | |
810 | struct net_device *tdev = NULL; | |
811 | struct ip_tunnel *tunnel; | |
812 | struct iphdr *iph; | |
813 | ||
814 | tunnel = netdev_priv(dev); | |
815 | iph = &tunnel->parms.iph; | |
816 | ||
817 | if (iph->daddr) { | |
818 | struct flowi fl = { .nl_u = { .ip4_u = | |
819 | { .daddr = iph->daddr, | |
820 | .saddr = iph->saddr, | |
821 | .tos = RT_TOS(iph->tos) } }, | |
822 | .oif = tunnel->parms.link, | |
823 | .proto = IPPROTO_IPV6 }; | |
824 | struct rtable *rt; | |
907a08c4 | 825 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
826 | tdev = rt->u.dst.dev; |
827 | ip_rt_put(rt); | |
828 | } | |
829 | dev->flags |= IFF_POINTOPOINT; | |
830 | } | |
831 | ||
832 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 833 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
834 | |
835 | if (tdev) { | |
836 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
837 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
838 | if (dev->mtu < IPV6_MIN_MTU) | |
839 | dev->mtu = IPV6_MIN_MTU; | |
840 | } | |
841 | dev->iflink = tunnel->parms.link; | |
842 | } | |
843 | ||
1da177e4 LT |
844 | static int |
845 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
846 | { | |
847 | int err = 0; | |
848 | struct ip_tunnel_parm p; | |
fadf6bf0 | 849 | struct ip_tunnel_prl prl; |
1da177e4 | 850 | struct ip_tunnel *t; |
ca8def14 PE |
851 | struct net *net = dev_net(dev); |
852 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
853 | |
854 | switch (cmd) { | |
855 | case SIOCGETTUNNEL: | |
856 | t = NULL; | |
cd3dbc19 | 857 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
858 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
859 | err = -EFAULT; | |
860 | break; | |
861 | } | |
ca8def14 | 862 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
863 | } |
864 | if (t == NULL) | |
2941a486 | 865 | t = netdev_priv(dev); |
1da177e4 LT |
866 | memcpy(&p, &t->parms, sizeof(p)); |
867 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
868 | err = -EFAULT; | |
869 | break; | |
870 | ||
871 | case SIOCADDTUNNEL: | |
872 | case SIOCCHGTUNNEL: | |
873 | err = -EPERM; | |
874 | if (!capable(CAP_NET_ADMIN)) | |
875 | goto done; | |
876 | ||
877 | err = -EFAULT; | |
878 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
879 | goto done; | |
880 | ||
881 | err = -EINVAL; | |
882 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
883 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
884 | goto done; | |
885 | if (p.iph.ttl) | |
886 | p.iph.frag_off |= htons(IP_DF); | |
887 | ||
ca8def14 | 888 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 889 | |
cd3dbc19 | 890 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
891 | if (t != NULL) { |
892 | if (t->dev != dev) { | |
893 | err = -EEXIST; | |
894 | break; | |
895 | } | |
896 | } else { | |
897 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
898 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
899 | err = -EINVAL; | |
900 | break; | |
901 | } | |
2941a486 | 902 | t = netdev_priv(dev); |
ca8def14 | 903 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
904 | t->parms.iph.saddr = p.iph.saddr; |
905 | t->parms.iph.daddr = p.iph.daddr; | |
906 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
907 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 908 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
909 | netdev_state_change(dev); |
910 | } | |
911 | } | |
912 | ||
913 | if (t) { | |
914 | err = 0; | |
915 | if (cmd == SIOCCHGTUNNEL) { | |
916 | t->parms.iph.ttl = p.iph.ttl; | |
917 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
918 | if (t->parms.link != p.link) { |
919 | t->parms.link = p.link; | |
920 | ipip6_tunnel_bind_dev(dev); | |
921 | netdev_state_change(dev); | |
922 | } | |
1da177e4 LT |
923 | } |
924 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
925 | err = -EFAULT; | |
926 | } else | |
927 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
928 | break; | |
929 | ||
930 | case SIOCDELTUNNEL: | |
931 | err = -EPERM; | |
932 | if (!capable(CAP_NET_ADMIN)) | |
933 | goto done; | |
934 | ||
cd3dbc19 | 935 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
936 | err = -EFAULT; |
937 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
938 | goto done; | |
939 | err = -ENOENT; | |
ca8def14 | 940 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
941 | goto done; |
942 | err = -EPERM; | |
cd3dbc19 | 943 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
944 | goto done; |
945 | dev = t->dev; | |
946 | } | |
22f8cde5 SH |
947 | unregister_netdevice(dev); |
948 | err = 0; | |
1da177e4 LT |
949 | break; |
950 | ||
300aaeea | 951 | case SIOCGETPRL: |
2b4743bd YH |
952 | err = -EINVAL; |
953 | if (dev == sitn->fb_tunnel_dev) | |
954 | goto done; | |
955 | err = -ENOENT; | |
956 | if (!(t = netdev_priv(dev))) | |
957 | goto done; | |
958 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
959 | break; | |
960 | ||
fadf6bf0 TF |
961 | case SIOCADDPRL: |
962 | case SIOCDELPRL: | |
963 | case SIOCCHGPRL: | |
964 | err = -EPERM; | |
2b4743bd | 965 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
966 | goto done; |
967 | err = -EINVAL; | |
cd3dbc19 | 968 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
969 | goto done; |
970 | err = -EFAULT; | |
971 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
972 | goto done; | |
973 | err = -ENOENT; | |
974 | if (!(t = netdev_priv(dev))) | |
975 | goto done; | |
976 | ||
300aaeea | 977 | switch (cmd) { |
300aaeea | 978 | case SIOCDELPRL: |
fadf6bf0 | 979 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
980 | break; |
981 | case SIOCADDPRL: | |
982 | case SIOCCHGPRL: | |
fadf6bf0 | 983 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
984 | break; |
985 | } | |
2b4743bd | 986 | netdev_state_change(dev); |
fadf6bf0 TF |
987 | break; |
988 | ||
1da177e4 LT |
989 | default: |
990 | err = -EINVAL; | |
991 | } | |
992 | ||
993 | done: | |
994 | return err; | |
995 | } | |
996 | ||
1da177e4 LT |
997 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
998 | { | |
999 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1000 | return -EINVAL; | |
1001 | dev->mtu = new_mtu; | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1326c3d5 SH |
1005 | static const struct net_device_ops ipip6_netdev_ops = { |
1006 | .ndo_uninit = ipip6_tunnel_uninit, | |
1007 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1008 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1009 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1010 | }; | |
1011 | ||
1da177e4 LT |
1012 | static void ipip6_tunnel_setup(struct net_device *dev) |
1013 | { | |
1326c3d5 | 1014 | dev->netdev_ops = &ipip6_netdev_ops; |
1da177e4 | 1015 | dev->destructor = free_netdev; |
1da177e4 LT |
1016 | |
1017 | dev->type = ARPHRD_SIT; | |
1018 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1019 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
1020 | dev->flags = IFF_NOARP; |
1021 | dev->iflink = 0; | |
1022 | dev->addr_len = 4; | |
7a97146c | 1023 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1024 | } |
1025 | ||
1326c3d5 | 1026 | static void ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1027 | { |
1326c3d5 | 1028 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1029 | |
1030 | tunnel->dev = dev; | |
1031 | strcpy(tunnel->parms.name, dev->name); | |
1032 | ||
1033 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1034 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1035 | ||
8a4a50f9 | 1036 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1037 | } |
1038 | ||
1326c3d5 | 1039 | static void ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1040 | { |
2941a486 | 1041 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1042 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1043 | struct net *net = dev_net(dev); |
1044 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1045 | |
1046 | tunnel->dev = dev; | |
1047 | strcpy(tunnel->parms.name, dev->name); | |
1048 | ||
1049 | iph->version = 4; | |
1050 | iph->protocol = IPPROTO_IPV6; | |
1051 | iph->ihl = 5; | |
1052 | iph->ttl = 64; | |
1053 | ||
1054 | dev_hold(dev); | |
29182176 | 1055 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1056 | } |
1057 | ||
c73cb5a2 | 1058 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1059 | .handler = ipip6_rcv, |
1060 | .err_handler = ipip6_err, | |
c73cb5a2 | 1061 | .priority = 1, |
1da177e4 LT |
1062 | }; |
1063 | ||
29182176 | 1064 | static void sit_destroy_tunnels(struct sit_net *sitn) |
db44575f AK |
1065 | { |
1066 | int prio; | |
1067 | ||
1068 | for (prio = 1; prio < 4; prio++) { | |
1069 | int h; | |
1070 | for (h = 0; h < HASH_SIZE; h++) { | |
1071 | struct ip_tunnel *t; | |
29182176 | 1072 | while ((t = sitn->tunnels[prio][h]) != NULL) |
db44575f AK |
1073 | unregister_netdevice(t->dev); |
1074 | } | |
1075 | } | |
1076 | } | |
1077 | ||
8190d900 PE |
1078 | static int sit_init_net(struct net *net) |
1079 | { | |
1080 | int err; | |
1081 | struct sit_net *sitn; | |
1082 | ||
1083 | err = -ENOMEM; | |
29182176 | 1084 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); |
8190d900 PE |
1085 | if (sitn == NULL) |
1086 | goto err_alloc; | |
1087 | ||
1088 | err = net_assign_generic(net, sit_net_id, sitn); | |
1089 | if (err < 0) | |
1090 | goto err_assign; | |
1091 | ||
29182176 PE |
1092 | sitn->tunnels[0] = sitn->tunnels_wc; |
1093 | sitn->tunnels[1] = sitn->tunnels_l; | |
1094 | sitn->tunnels[2] = sitn->tunnels_r; | |
1095 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1096 | ||
cd3dbc19 PE |
1097 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1098 | ipip6_tunnel_setup); | |
1099 | if (!sitn->fb_tunnel_dev) { | |
1100 | err = -ENOMEM; | |
1101 | goto err_alloc_dev; | |
1102 | } | |
be77e593 | 1103 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1104 | |
1326c3d5 | 1105 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1106 | |
1107 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1108 | goto err_reg_dev; | |
1109 | ||
8190d900 PE |
1110 | return 0; |
1111 | ||
cd3dbc19 | 1112 | err_reg_dev: |
1326c3d5 | 1113 | dev_put(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1114 | free_netdev(sitn->fb_tunnel_dev); |
1115 | err_alloc_dev: | |
1116 | /* nothing */ | |
8190d900 PE |
1117 | err_assign: |
1118 | kfree(sitn); | |
1119 | err_alloc: | |
1120 | return err; | |
1121 | } | |
1122 | ||
1123 | static void sit_exit_net(struct net *net) | |
1124 | { | |
1125 | struct sit_net *sitn; | |
1126 | ||
1127 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 | 1128 | rtnl_lock(); |
29182176 | 1129 | sit_destroy_tunnels(sitn); |
cd3dbc19 PE |
1130 | unregister_netdevice(sitn->fb_tunnel_dev); |
1131 | rtnl_unlock(); | |
8190d900 PE |
1132 | kfree(sitn); |
1133 | } | |
1134 | ||
1135 | static struct pernet_operations sit_net_ops = { | |
1136 | .init = sit_init_net, | |
1137 | .exit = sit_exit_net, | |
1138 | }; | |
1139 | ||
89c89458 | 1140 | static void __exit sit_cleanup(void) |
1da177e4 | 1141 | { |
c73cb5a2 | 1142 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1143 | |
8190d900 | 1144 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); |
1da177e4 LT |
1145 | } |
1146 | ||
89c89458 | 1147 | static int __init sit_init(void) |
1da177e4 LT |
1148 | { |
1149 | int err; | |
1150 | ||
1151 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1152 | ||
c73cb5a2 | 1153 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1154 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1155 | return -EAGAIN; | |
1156 | } | |
1157 | ||
8190d900 PE |
1158 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1159 | if (err < 0) | |
cd3dbc19 | 1160 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1161 | |
1da177e4 | 1162 | return err; |
1da177e4 | 1163 | } |
989e5b96 JR |
1164 | |
1165 | module_init(sit_init); | |
1166 | module_exit(sit_cleanup); | |
39c85086 | 1167 | MODULE_LICENSE("GPL"); |
daccff02 | 1168 | MODULE_ALIAS("sit0"); |