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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 | ||
f3213831 JP |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include <linux/init.h> | |
36 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 37 | #include <linux/if_ether.h> |
1da177e4 LT |
38 | |
39 | #include <net/sock.h> | |
40 | #include <net/snmp.h> | |
41 | ||
42 | #include <net/ipv6.h> | |
43 | #include <net/protocol.h> | |
44 | #include <net/transp_v6.h> | |
45 | #include <net/ip6_fib.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <net/ndisc.h> | |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip.h> | |
50 | #include <net/udp.h> | |
51 | #include <net/icmp.h> | |
52 | #include <net/ipip.h> | |
53 | #include <net/inet_ecn.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
8190d900 PE |
56 | #include <net/net_namespace.h> |
57 | #include <net/netns/generic.h> | |
1da177e4 LT |
58 | |
59 | /* | |
60 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
61 | ||
62 | For comments look at net/ipv4/ip_gre.c --ANK | |
63 | */ | |
64 | ||
65 | #define HASH_SIZE 16 | |
e69a4adc | 66 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 67 | |
15fc1f70 | 68 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 69 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 70 | static void ipip6_dev_free(struct net_device *dev); |
ba3e3f50 | 71 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 72 | |
f99189b1 | 73 | static int sit_net_id __read_mostly; |
8190d900 | 74 | struct sit_net { |
3a43be3c ED |
75 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
76 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
77 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
78 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
79 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 80 | |
cd3dbc19 | 81 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
82 | }; |
83 | ||
4543c10d | 84 | /* |
3a43be3c | 85 | * Locking : hash tables are protected by RCU and RTNL |
4543c10d | 86 | */ |
4543c10d ED |
87 | |
88 | #define for_each_ip_tunnel_rcu(start) \ | |
89 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 90 | |
87b6d218 | 91 | static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, |
92 | struct rtnl_link_stats64 *tot) | |
15fc1f70 | 93 | { |
15fc1f70 ED |
94 | int i; |
95 | ||
96 | for_each_possible_cpu(i) { | |
97 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 98 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
99 | unsigned int start; | |
100 | ||
101 | do { | |
102 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
103 | rx_packets = tstats->rx_packets; | |
104 | tx_packets = tstats->tx_packets; | |
105 | rx_bytes = tstats->rx_bytes; | |
106 | tx_bytes = tstats->tx_bytes; | |
107 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
108 | ||
109 | tot->rx_packets += rx_packets; | |
110 | tot->tx_packets += tx_packets; | |
111 | tot->rx_bytes += rx_bytes; | |
112 | tot->tx_bytes += tx_bytes; | |
15fc1f70 | 113 | } |
87b6d218 | 114 | |
115 | tot->rx_errors = dev->stats.rx_errors; | |
116 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
117 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
118 | tot->tx_dropped = dev->stats.tx_dropped; | |
119 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
120 | tot->tx_errors = dev->stats.tx_errors; | |
121 | ||
122 | return tot; | |
15fc1f70 | 123 | } |
87b6d218 | 124 | |
4543c10d ED |
125 | /* |
126 | * Must be invoked with rcu_read_lock | |
127 | */ | |
3e866703 | 128 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 129 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 130 | { |
3a43be3c ED |
131 | unsigned int h0 = HASH(remote); |
132 | unsigned int h1 = HASH(local); | |
1da177e4 | 133 | struct ip_tunnel *t; |
29182176 | 134 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 135 | |
4543c10d | 136 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 137 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
138 | remote == t->parms.iph.daddr && |
139 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
140 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
141 | return t; |
142 | } | |
4543c10d | 143 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { |
4fddbf5d SH |
144 | if (remote == t->parms.iph.daddr && |
145 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
146 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
147 | return t; |
148 | } | |
4543c10d | 149 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { |
4fddbf5d SH |
150 | if (local == t->parms.iph.saddr && |
151 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
152 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
153 | return t; |
154 | } | |
4543c10d | 155 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 156 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
157 | return t; |
158 | return NULL; | |
159 | } | |
160 | ||
3a43be3c | 161 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 162 | struct ip_tunnel_parm *parms) |
1da177e4 | 163 | { |
420fe234 YH |
164 | __be32 remote = parms->iph.daddr; |
165 | __be32 local = parms->iph.saddr; | |
3a43be3c | 166 | unsigned int h = 0; |
1da177e4 LT |
167 | int prio = 0; |
168 | ||
169 | if (remote) { | |
170 | prio |= 2; | |
171 | h ^= HASH(remote); | |
172 | } | |
173 | if (local) { | |
174 | prio |= 1; | |
175 | h ^= HASH(local); | |
176 | } | |
29182176 | 177 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
178 | } |
179 | ||
3a43be3c | 180 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 181 | struct ip_tunnel *t) |
420fe234 | 182 | { |
ca8def14 | 183 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
184 | } |
185 | ||
ca8def14 | 186 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 187 | { |
3a43be3c ED |
188 | struct ip_tunnel __rcu **tp; |
189 | struct ip_tunnel *iter; | |
190 | ||
191 | for (tp = ipip6_bucket(sitn, t); | |
192 | (iter = rtnl_dereference(*tp)) != NULL; | |
193 | tp = &iter->next) { | |
194 | if (t == iter) { | |
cf778b00 | 195 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
196 | break; |
197 | } | |
198 | } | |
199 | } | |
200 | ||
ca8def14 | 201 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 202 | { |
3a43be3c | 203 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 204 | |
cf778b00 ED |
205 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
206 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
207 | } |
208 | ||
e0c93948 | 209 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
210 | { |
211 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
212 | struct ip_tunnel *t = netdev_priv(dev); |
213 | ||
fa857afc YH |
214 | if (t->dev == sitn->fb_tunnel_dev) { |
215 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
216 | t->ip6rd.relay_prefix = 0; | |
217 | t->ip6rd.prefixlen = 16; | |
218 | t->ip6rd.relay_prefixlen = 0; | |
219 | } else { | |
220 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
221 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
222 | } | |
223 | #endif | |
224 | } | |
225 | ||
3a43be3c | 226 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 227 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 228 | { |
e69a4adc AV |
229 | __be32 remote = parms->iph.daddr; |
230 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
231 | struct ip_tunnel *t, *nt; |
232 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 233 | struct net_device *dev; |
1da177e4 | 234 | char name[IFNAMSIZ]; |
ca8def14 | 235 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 236 | |
3a43be3c ED |
237 | for (tp = __ipip6_bucket(sitn, parms); |
238 | (t = rtnl_dereference(*tp)) != NULL; | |
239 | tp = &t->next) { | |
8db99e57 | 240 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
241 | remote == t->parms.iph.daddr && |
242 | parms->link == t->parms.link) { | |
8db99e57 SH |
243 | if (create) |
244 | return NULL; | |
245 | else | |
246 | return t; | |
247 | } | |
1da177e4 LT |
248 | } |
249 | if (!create) | |
250 | goto failed; | |
251 | ||
252 | if (parms->name[0]) | |
253 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 254 | else |
15fc1f70 | 255 | strcpy(name, "sit%d"); |
1da177e4 LT |
256 | |
257 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
258 | if (dev == NULL) | |
259 | return NULL; | |
260 | ||
7a97146c PE |
261 | dev_net_set(dev, net); |
262 | ||
2941a486 | 263 | nt = netdev_priv(dev); |
1326c3d5 | 264 | |
1da177e4 | 265 | nt->parms = *parms; |
15fc1f70 ED |
266 | if (ipip6_tunnel_init(dev) < 0) |
267 | goto failed_free; | |
e0c93948 | 268 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 269 | |
c7dc89c0 FT |
270 | if (parms->i_flags & SIT_ISATAP) |
271 | dev->priv_flags |= IFF_ISATAP; | |
272 | ||
b37d428b PE |
273 | if (register_netdevice(dev) < 0) |
274 | goto failed_free; | |
1da177e4 | 275 | |
72b36015 | 276 | strcpy(nt->parms.name, dev->name); |
ba3e3f50 | 277 | dev->rtnl_link_ops = &sit_link_ops; |
72b36015 | 278 | |
1da177e4 LT |
279 | dev_hold(dev); |
280 | ||
ca8def14 | 281 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
282 | return nt; |
283 | ||
b37d428b | 284 | failed_free: |
15fc1f70 | 285 | ipip6_dev_free(dev); |
1da177e4 LT |
286 | failed: |
287 | return NULL; | |
288 | } | |
289 | ||
ef9a9d11 ED |
290 | #define for_each_prl_rcu(start) \ |
291 | for (prl = rcu_dereference(start); \ | |
292 | prl; \ | |
293 | prl = rcu_dereference(prl->next)) | |
294 | ||
fadf6bf0 | 295 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 296 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 297 | { |
ef9a9d11 | 298 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 299 | |
ef9a9d11 ED |
300 | for_each_prl_rcu(t->prl) |
301 | if (prl->addr == addr) | |
fadf6bf0 | 302 | break; |
ef9a9d11 | 303 | return prl; |
fadf6bf0 TF |
304 | |
305 | } | |
306 | ||
2b4743bd YH |
307 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
308 | struct ip_tunnel_prl __user *a) | |
300aaeea | 309 | { |
2b4743bd | 310 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
311 | struct ip_tunnel_prl_entry *prl; |
312 | unsigned int cmax, c = 0, ca, len; | |
313 | int ret = 0; | |
314 | ||
2b4743bd YH |
315 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
316 | return -EFAULT; | |
317 | cmax = kprl.datalen / sizeof(kprl); | |
318 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
319 | cmax = 1; |
320 | ||
321 | /* For simple GET or for root users, | |
322 | * we try harder to allocate. | |
323 | */ | |
324 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
325 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
326 | NULL; | |
327 | ||
ef9a9d11 | 328 | rcu_read_lock(); |
300aaeea YH |
329 | |
330 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
331 | ||
332 | if (!kp) { | |
333 | /* We don't try hard to allocate much memory for | |
334 | * non-root users. | |
335 | * For root users, retry allocating enough memory for | |
336 | * the answer. | |
337 | */ | |
338 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
339 | if (!kp) { | |
340 | ret = -ENOMEM; | |
341 | goto out; | |
342 | } | |
343 | } | |
344 | ||
345 | c = 0; | |
ef9a9d11 | 346 | for_each_prl_rcu(t->prl) { |
298bf12d | 347 | if (c >= cmax) |
300aaeea | 348 | break; |
2b4743bd | 349 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
350 | continue; |
351 | kp[c].addr = prl->addr; | |
352 | kp[c].flags = prl->flags; | |
353 | c++; | |
2b4743bd | 354 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
355 | break; |
356 | } | |
357 | out: | |
ef9a9d11 | 358 | rcu_read_unlock(); |
300aaeea YH |
359 | |
360 | len = sizeof(*kp) * c; | |
2b4743bd YH |
361 | ret = 0; |
362 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
363 | ret = -EFAULT; | |
300aaeea YH |
364 | |
365 | kfree(kp); | |
300aaeea | 366 | |
2b4743bd | 367 | return ret; |
300aaeea YH |
368 | } |
369 | ||
fadf6bf0 TF |
370 | static int |
371 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
372 | { | |
373 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
374 | int err = 0; |
375 | ||
0009ae1f YH |
376 | if (a->addr == htonl(INADDR_ANY)) |
377 | return -EINVAL; | |
378 | ||
aac4dddc | 379 | ASSERT_RTNL(); |
fadf6bf0 | 380 | |
3a43be3c | 381 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 382 | if (p->addr == a->addr) { |
ef9a9d11 ED |
383 | if (chg) { |
384 | p->flags = a->flags; | |
385 | goto out; | |
386 | } | |
3fcfa129 YH |
387 | err = -EEXIST; |
388 | goto out; | |
fadf6bf0 TF |
389 | } |
390 | } | |
391 | ||
3fcfa129 YH |
392 | if (chg) { |
393 | err = -ENXIO; | |
394 | goto out; | |
395 | } | |
fadf6bf0 TF |
396 | |
397 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
398 | if (!p) { |
399 | err = -ENOBUFS; | |
400 | goto out; | |
401 | } | |
fadf6bf0 | 402 | |
fadf6bf0 | 403 | p->next = t->prl; |
300aaeea YH |
404 | p->addr = a->addr; |
405 | p->flags = a->flags; | |
ef9a9d11 | 406 | t->prl_count++; |
cf778b00 | 407 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 408 | out: |
3fcfa129 | 409 | return err; |
fadf6bf0 TF |
410 | } |
411 | ||
ef9a9d11 ED |
412 | static void prl_list_destroy_rcu(struct rcu_head *head) |
413 | { | |
414 | struct ip_tunnel_prl_entry *p, *n; | |
415 | ||
416 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
417 | do { | |
753ea8e9 | 418 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
419 | kfree(p); |
420 | p = n; | |
421 | } while (p); | |
422 | } | |
423 | ||
fadf6bf0 TF |
424 | static int |
425 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
426 | { | |
753ea8e9 ED |
427 | struct ip_tunnel_prl_entry *x; |
428 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
429 | int err = 0; |
430 | ||
aac4dddc | 431 | ASSERT_RTNL(); |
fadf6bf0 | 432 | |
0009ae1f | 433 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
434 | for (p = &t->prl; |
435 | (x = rtnl_dereference(*p)) != NULL; | |
436 | p = &x->next) { | |
437 | if (x->addr == a->addr) { | |
fadf6bf0 | 438 | *p = x->next; |
11c476f3 | 439 | kfree_rcu(x, rcu_head); |
300aaeea | 440 | t->prl_count--; |
3fcfa129 | 441 | goto out; |
fadf6bf0 TF |
442 | } |
443 | } | |
3fcfa129 | 444 | err = -ENXIO; |
fadf6bf0 | 445 | } else { |
753ea8e9 ED |
446 | x = rtnl_dereference(t->prl); |
447 | if (x) { | |
ef9a9d11 | 448 | t->prl_count = 0; |
ef9a9d11 ED |
449 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
450 | t->prl = NULL; | |
fadf6bf0 TF |
451 | } |
452 | } | |
3fcfa129 | 453 | out: |
4b279601 | 454 | return err; |
fadf6bf0 TF |
455 | } |
456 | ||
fadf6bf0 | 457 | static int |
b71d1d42 | 458 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 459 | { |
3fcfa129 | 460 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
461 | int ok = 1; |
462 | ||
ef9a9d11 | 463 | rcu_read_lock(); |
3fcfa129 | 464 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 465 | if (p) { |
300aaeea | 466 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
467 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
468 | else | |
469 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
470 | } else { | |
b71d1d42 ED |
471 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
472 | ||
fadf6bf0 TF |
473 | if (ipv6_addr_is_isatap(addr6) && |
474 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 475 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
476 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
477 | else | |
478 | ok = 0; | |
479 | } | |
ef9a9d11 | 480 | rcu_read_unlock(); |
fadf6bf0 TF |
481 | return ok; |
482 | } | |
483 | ||
1da177e4 LT |
484 | static void ipip6_tunnel_uninit(struct net_device *dev) |
485 | { | |
ca8def14 PE |
486 | struct net *net = dev_net(dev); |
487 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
488 | ||
cd3dbc19 | 489 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 490 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 491 | } else { |
ca8def14 | 492 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 493 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 494 | } |
3a43be3c | 495 | dev_put(dev); |
1da177e4 LT |
496 | } |
497 | ||
498 | ||
c73cb5a2 | 499 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 500 | { |
1da177e4 | 501 | |
071f92d0 | 502 | /* All the routers (except for Linux) return only |
1da177e4 LT |
503 | 8 bytes of packet payload. It means, that precise relaying of |
504 | ICMP in the real Internet is absolutely infeasible. | |
505 | */ | |
b71d1d42 | 506 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
507 | const int type = icmp_hdr(skb)->type; |
508 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 509 | struct ip_tunnel *t; |
c73cb5a2 | 510 | int err; |
1da177e4 LT |
511 | |
512 | switch (type) { | |
513 | default: | |
514 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 515 | return 0; |
1da177e4 LT |
516 | |
517 | case ICMP_DEST_UNREACH: | |
518 | switch (code) { | |
519 | case ICMP_SR_FAILED: | |
520 | case ICMP_PORT_UNREACH: | |
521 | /* Impossible event. */ | |
c73cb5a2 | 522 | return 0; |
1da177e4 LT |
523 | default: |
524 | /* All others are translated to HOST_UNREACH. | |
525 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
526 | I believe they are just ether pollution. --ANK | |
527 | */ | |
528 | break; | |
529 | } | |
530 | break; | |
531 | case ICMP_TIME_EXCEEDED: | |
532 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 533 | return 0; |
1da177e4 | 534 | break; |
ec18d9a2 DM |
535 | case ICMP_REDIRECT: |
536 | break; | |
1da177e4 LT |
537 | } |
538 | ||
c73cb5a2 KM |
539 | err = -ENOENT; |
540 | ||
4fddbf5d SH |
541 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
542 | skb->dev, | |
543 | iph->daddr, | |
544 | iph->saddr); | |
36393395 DM |
545 | if (t == NULL) |
546 | goto out; | |
547 | ||
548 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
549 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
550 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
551 | err = 0; | |
552 | goto out; | |
553 | } | |
ec18d9a2 DM |
554 | if (type == ICMP_REDIRECT) { |
555 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
556 | IPPROTO_IPV6, 0); | |
557 | err = 0; | |
558 | goto out; | |
559 | } | |
36393395 DM |
560 | |
561 | if (t->parms.iph.daddr == 0) | |
1da177e4 | 562 | goto out; |
c73cb5a2 KM |
563 | |
564 | err = 0; | |
1da177e4 LT |
565 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
566 | goto out; | |
567 | ||
bb80087a | 568 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
569 | t->err_count++; |
570 | else | |
571 | t->err_count = 1; | |
572 | t->err_time = jiffies; | |
573 | out: | |
c73cb5a2 | 574 | return err; |
1da177e4 LT |
575 | } |
576 | ||
b71d1d42 | 577 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
578 | { |
579 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 580 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
581 | } |
582 | ||
583 | static int ipip6_rcv(struct sk_buff *skb) | |
584 | { | |
b71d1d42 | 585 | const struct iphdr *iph; |
1da177e4 LT |
586 | struct ip_tunnel *tunnel; |
587 | ||
588 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
589 | goto out; | |
590 | ||
eddc9ec5 | 591 | iph = ip_hdr(skb); |
1da177e4 | 592 | |
4fddbf5d SH |
593 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
594 | iph->saddr, iph->daddr); | |
595 | if (tunnel != NULL) { | |
15fc1f70 ED |
596 | struct pcpu_tstats *tstats; |
597 | ||
1da177e4 | 598 | secpath_reset(skb); |
b0e380b1 | 599 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 600 | skb_reset_network_header(skb); |
8cdfab8a | 601 | IPCB(skb)->flags = 0; |
1da177e4 LT |
602 | skb->protocol = htons(ETH_P_IPV6); |
603 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
604 | |
605 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 606 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 607 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
608 | kfree_skb(skb); |
609 | return 0; | |
610 | } | |
d19d56dd | 611 | |
15fc1f70 ED |
612 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
613 | tstats->rx_packets++; | |
614 | tstats->rx_bytes += skb->len; | |
615 | ||
616 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 617 | |
1da177e4 | 618 | ipip6_ecn_decapsulate(iph, skb); |
8990f468 | 619 | |
caf586e5 | 620 | netif_rx(skb); |
8990f468 | 621 | |
1da177e4 LT |
622 | return 0; |
623 | } | |
624 | ||
6dcdd1b3 | 625 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 626 | return 1; |
1da177e4 | 627 | out: |
36ca34cc | 628 | kfree_skb(skb); |
1da177e4 LT |
629 | return 0; |
630 | } | |
631 | ||
fa857afc YH |
632 | /* |
633 | * Returns the embedded IPv4 address if the IPv6 address | |
634 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
635 | */ | |
636 | static inline | |
b71d1d42 | 637 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) |
1da177e4 | 638 | { |
e69a4adc | 639 | __be32 dst = 0; |
1da177e4 | 640 | |
fa857afc YH |
641 | #ifdef CONFIG_IPV6_SIT_6RD |
642 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
643 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 644 | unsigned int pbw0, pbi0; |
fa857afc YH |
645 | int pbi1; |
646 | u32 d; | |
647 | ||
648 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
649 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
650 | ||
e7db38c3 | 651 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
652 | tunnel->ip6rd.relay_prefixlen; |
653 | ||
654 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
655 | if (pbi1 > 0) | |
e7db38c3 | 656 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
657 | (32 - pbi1); |
658 | ||
659 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
660 | } | |
661 | #else | |
1da177e4 | 662 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 663 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
664 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
665 | } | |
fa857afc | 666 | #endif |
1da177e4 LT |
667 | return dst; |
668 | } | |
669 | ||
670 | /* | |
671 | * This function assumes it is being called from dev_queue_xmit() | |
672 | * and that skb is filled properly by that function. | |
673 | */ | |
674 | ||
6fef4c0c SH |
675 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
676 | struct net_device *dev) | |
1da177e4 | 677 | { |
2941a486 | 678 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
679 | const struct iphdr *tiph = &tunnel->parms.iph; |
680 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 681 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 682 | __be16 df = tiph->frag_off; |
1da177e4 | 683 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 684 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 685 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 686 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 687 | __be32 dst = tiph->daddr; |
31e4543d | 688 | struct flowi4 fl4; |
1da177e4 | 689 | int mtu; |
b71d1d42 | 690 | const struct in6_addr *addr6; |
1da177e4 LT |
691 | int addr_type; |
692 | ||
1da177e4 LT |
693 | if (skb->protocol != htons(ETH_P_IPV6)) |
694 | goto tx_error; | |
695 | ||
c2bceb3d LEM |
696 | if (tos == 1) |
697 | tos = ipv6_get_dsfield(iph6); | |
698 | ||
c7dc89c0 FT |
699 | /* ISATAP (RFC4214) - must come before 6to4 */ |
700 | if (dev->priv_flags & IFF_ISATAP) { | |
701 | struct neighbour *neigh = NULL; | |
1e2927b0 | 702 | bool do_tx_error = false; |
c7dc89c0 | 703 | |
adf30907 | 704 | if (skb_dst(skb)) |
1e2927b0 | 705 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
706 | |
707 | if (neigh == NULL) { | |
e87cc472 | 708 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
c7dc89c0 FT |
709 | goto tx_error; |
710 | } | |
711 | ||
3e866703 | 712 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
713 | addr_type = ipv6_addr_type(addr6); |
714 | ||
715 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
716 | ipv6_addr_is_isatap(addr6)) | |
717 | dst = addr6->s6_addr32[3]; | |
718 | else | |
1e2927b0 DM |
719 | do_tx_error = true; |
720 | ||
721 | neigh_release(neigh); | |
722 | if (do_tx_error) | |
c7dc89c0 FT |
723 | goto tx_error; |
724 | } | |
725 | ||
1da177e4 | 726 | if (!dst) |
fa857afc | 727 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
728 | |
729 | if (!dst) { | |
730 | struct neighbour *neigh = NULL; | |
1e2927b0 | 731 | bool do_tx_error = false; |
1da177e4 | 732 | |
adf30907 | 733 | if (skb_dst(skb)) |
1e2927b0 | 734 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
735 | |
736 | if (neigh == NULL) { | |
e87cc472 | 737 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
1da177e4 LT |
738 | goto tx_error; |
739 | } | |
740 | ||
3e866703 | 741 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
742 | addr_type = ipv6_addr_type(addr6); |
743 | ||
744 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 745 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
746 | addr_type = ipv6_addr_type(addr6); |
747 | } | |
748 | ||
1e2927b0 DM |
749 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
750 | dst = addr6->s6_addr32[3]; | |
751 | else | |
752 | do_tx_error = true; | |
1da177e4 | 753 | |
1e2927b0 DM |
754 | neigh_release(neigh); |
755 | if (do_tx_error) | |
756 | goto tx_error; | |
1da177e4 LT |
757 | } |
758 | ||
31e4543d | 759 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
760 | dst, tiph->saddr, |
761 | 0, 0, | |
762 | IPPROTO_IPV6, RT_TOS(tos), | |
763 | tunnel->parms.link); | |
764 | if (IS_ERR(rt)) { | |
765 | dev->stats.tx_carrier_errors++; | |
766 | goto tx_error_icmp; | |
1da177e4 LT |
767 | } |
768 | if (rt->rt_type != RTN_UNICAST) { | |
769 | ip_rt_put(rt); | |
15fc1f70 | 770 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
771 | goto tx_error_icmp; |
772 | } | |
d8d1f30b | 773 | tdev = rt->dst.dev; |
1da177e4 LT |
774 | |
775 | if (tdev == dev) { | |
776 | ip_rt_put(rt); | |
15fc1f70 | 777 | dev->stats.collisions++; |
1da177e4 LT |
778 | goto tx_error; |
779 | } | |
780 | ||
292f4f3c | 781 | if (df) { |
d8d1f30b | 782 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 783 | |
292f4f3c | 784 | if (mtu < 68) { |
15fc1f70 | 785 | dev->stats.collisions++; |
292f4f3c HX |
786 | ip_rt_put(rt); |
787 | goto tx_error; | |
788 | } | |
1da177e4 | 789 | |
292f4f3c HX |
790 | if (mtu < IPV6_MIN_MTU) { |
791 | mtu = IPV6_MIN_MTU; | |
792 | df = 0; | |
793 | } | |
794 | ||
795 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 796 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c HX |
797 | |
798 | if (skb->len > mtu) { | |
3ffe533c | 799 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
800 | ip_rt_put(rt); |
801 | goto tx_error; | |
802 | } | |
1da177e4 LT |
803 | } |
804 | ||
805 | if (tunnel->err_count > 0) { | |
bb80087a WY |
806 | if (time_before(jiffies, |
807 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
808 | tunnel->err_count--; |
809 | dst_link_failure(skb); | |
810 | } else | |
811 | tunnel->err_count = 0; | |
812 | } | |
813 | ||
814 | /* | |
815 | * Okay, now see if we can stuff it in the buffer as-is. | |
816 | */ | |
817 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
818 | ||
cfbba49d PM |
819 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
820 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
821 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
822 | if (!new_skb) { | |
823 | ip_rt_put(rt); | |
15fc1f70 | 824 | dev->stats.tx_dropped++; |
1da177e4 | 825 | dev_kfree_skb(skb); |
6ed10654 | 826 | return NETDEV_TX_OK; |
1da177e4 LT |
827 | } |
828 | if (skb->sk) | |
829 | skb_set_owner_w(new_skb, skb->sk); | |
830 | dev_kfree_skb(skb); | |
831 | skb = new_skb; | |
0660e03f | 832 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
833 | } |
834 | ||
b0e380b1 | 835 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
836 | skb_push(skb, sizeof(struct iphdr)); |
837 | skb_reset_network_header(skb); | |
1da177e4 | 838 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 839 | IPCB(skb)->flags = 0; |
adf30907 | 840 | skb_dst_drop(skb); |
d8d1f30b | 841 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
842 | |
843 | /* | |
844 | * Push down and install the IPIP header. | |
845 | */ | |
846 | ||
eddc9ec5 | 847 | iph = ip_hdr(skb); |
1da177e4 LT |
848 | iph->version = 4; |
849 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 850 | iph->frag_off = df; |
1da177e4 LT |
851 | iph->protocol = IPPROTO_IPV6; |
852 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
301102cc DM |
853 | iph->daddr = fl4.daddr; |
854 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
855 | |
856 | if ((iph->ttl = tiph->ttl) == 0) | |
857 | iph->ttl = iph6->hop_limit; | |
858 | ||
aa0010f8 | 859 | iptunnel_xmit(skb, dev); |
6ed10654 | 860 | return NETDEV_TX_OK; |
1da177e4 LT |
861 | |
862 | tx_error_icmp: | |
863 | dst_link_failure(skb); | |
864 | tx_error: | |
15fc1f70 | 865 | dev->stats.tx_errors++; |
1da177e4 | 866 | dev_kfree_skb(skb); |
6ed10654 | 867 | return NETDEV_TX_OK; |
1da177e4 LT |
868 | } |
869 | ||
8a4a50f9 MS |
870 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
871 | { | |
872 | struct net_device *tdev = NULL; | |
873 | struct ip_tunnel *tunnel; | |
b71d1d42 | 874 | const struct iphdr *iph; |
31e4543d | 875 | struct flowi4 fl4; |
8a4a50f9 MS |
876 | |
877 | tunnel = netdev_priv(dev); | |
878 | iph = &tunnel->parms.iph; | |
879 | ||
880 | if (iph->daddr) { | |
31e4543d | 881 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
882 | iph->daddr, iph->saddr, |
883 | 0, 0, | |
884 | IPPROTO_IPV6, | |
885 | RT_TOS(iph->tos), | |
886 | tunnel->parms.link); | |
b23dd4fe DM |
887 | |
888 | if (!IS_ERR(rt)) { | |
d8d1f30b | 889 | tdev = rt->dst.dev; |
8a4a50f9 MS |
890 | ip_rt_put(rt); |
891 | } | |
892 | dev->flags |= IFF_POINTOPOINT; | |
893 | } | |
894 | ||
895 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 896 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
897 | |
898 | if (tdev) { | |
899 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
900 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
901 | if (dev->mtu < IPV6_MIN_MTU) | |
902 | dev->mtu = IPV6_MIN_MTU; | |
903 | } | |
904 | dev->iflink = tunnel->parms.link; | |
905 | } | |
906 | ||
1da177e4 LT |
907 | static int |
908 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
909 | { | |
910 | int err = 0; | |
911 | struct ip_tunnel_parm p; | |
fadf6bf0 | 912 | struct ip_tunnel_prl prl; |
1da177e4 | 913 | struct ip_tunnel *t; |
ca8def14 PE |
914 | struct net *net = dev_net(dev); |
915 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
916 | #ifdef CONFIG_IPV6_SIT_6RD |
917 | struct ip_tunnel_6rd ip6rd; | |
918 | #endif | |
1da177e4 LT |
919 | |
920 | switch (cmd) { | |
921 | case SIOCGETTUNNEL: | |
fa857afc YH |
922 | #ifdef CONFIG_IPV6_SIT_6RD |
923 | case SIOCGET6RD: | |
924 | #endif | |
1da177e4 | 925 | t = NULL; |
cd3dbc19 | 926 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
927 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
928 | err = -EFAULT; | |
929 | break; | |
930 | } | |
ca8def14 | 931 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
932 | } |
933 | if (t == NULL) | |
2941a486 | 934 | t = netdev_priv(dev); |
fa857afc YH |
935 | |
936 | err = -EFAULT; | |
937 | if (cmd == SIOCGETTUNNEL) { | |
938 | memcpy(&p, &t->parms, sizeof(p)); | |
939 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
940 | sizeof(p))) | |
941 | goto done; | |
942 | #ifdef CONFIG_IPV6_SIT_6RD | |
943 | } else { | |
4e3fd7a0 | 944 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
945 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
946 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
947 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
948 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
949 | sizeof(ip6rd))) | |
950 | goto done; | |
951 | #endif | |
952 | } | |
953 | err = 0; | |
1da177e4 LT |
954 | break; |
955 | ||
956 | case SIOCADDTUNNEL: | |
957 | case SIOCCHGTUNNEL: | |
958 | err = -EPERM; | |
959 | if (!capable(CAP_NET_ADMIN)) | |
960 | goto done; | |
961 | ||
962 | err = -EFAULT; | |
963 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
964 | goto done; | |
965 | ||
966 | err = -EINVAL; | |
967 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
968 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
969 | goto done; | |
970 | if (p.iph.ttl) | |
971 | p.iph.frag_off |= htons(IP_DF); | |
972 | ||
ca8def14 | 973 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 974 | |
cd3dbc19 | 975 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
976 | if (t != NULL) { |
977 | if (t->dev != dev) { | |
978 | err = -EEXIST; | |
979 | break; | |
980 | } | |
981 | } else { | |
982 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
983 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
984 | err = -EINVAL; | |
985 | break; | |
986 | } | |
2941a486 | 987 | t = netdev_priv(dev); |
ca8def14 | 988 | ipip6_tunnel_unlink(sitn, t); |
74b0b85b | 989 | synchronize_net(); |
1da177e4 LT |
990 | t->parms.iph.saddr = p.iph.saddr; |
991 | t->parms.iph.daddr = p.iph.daddr; | |
992 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
993 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 994 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
995 | netdev_state_change(dev); |
996 | } | |
997 | } | |
998 | ||
999 | if (t) { | |
1000 | err = 0; | |
1001 | if (cmd == SIOCCHGTUNNEL) { | |
1002 | t->parms.iph.ttl = p.iph.ttl; | |
1003 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
1004 | if (t->parms.link != p.link) { |
1005 | t->parms.link = p.link; | |
1006 | ipip6_tunnel_bind_dev(dev); | |
1007 | netdev_state_change(dev); | |
1008 | } | |
1da177e4 LT |
1009 | } |
1010 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1011 | err = -EFAULT; | |
1012 | } else | |
1013 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1014 | break; | |
1015 | ||
1016 | case SIOCDELTUNNEL: | |
1017 | err = -EPERM; | |
1018 | if (!capable(CAP_NET_ADMIN)) | |
1019 | goto done; | |
1020 | ||
cd3dbc19 | 1021 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1022 | err = -EFAULT; |
1023 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1024 | goto done; | |
1025 | err = -ENOENT; | |
ca8def14 | 1026 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1027 | goto done; |
1028 | err = -EPERM; | |
cd3dbc19 | 1029 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1030 | goto done; |
1031 | dev = t->dev; | |
1032 | } | |
22f8cde5 SH |
1033 | unregister_netdevice(dev); |
1034 | err = 0; | |
1da177e4 LT |
1035 | break; |
1036 | ||
300aaeea | 1037 | case SIOCGETPRL: |
2b4743bd YH |
1038 | err = -EINVAL; |
1039 | if (dev == sitn->fb_tunnel_dev) | |
1040 | goto done; | |
1041 | err = -ENOENT; | |
1042 | if (!(t = netdev_priv(dev))) | |
1043 | goto done; | |
1044 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1045 | break; | |
1046 | ||
fadf6bf0 TF |
1047 | case SIOCADDPRL: |
1048 | case SIOCDELPRL: | |
1049 | case SIOCCHGPRL: | |
1050 | err = -EPERM; | |
2b4743bd | 1051 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1052 | goto done; |
1053 | err = -EINVAL; | |
cd3dbc19 | 1054 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1055 | goto done; |
1056 | err = -EFAULT; | |
1057 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1058 | goto done; | |
1059 | err = -ENOENT; | |
1060 | if (!(t = netdev_priv(dev))) | |
1061 | goto done; | |
1062 | ||
300aaeea | 1063 | switch (cmd) { |
300aaeea | 1064 | case SIOCDELPRL: |
fadf6bf0 | 1065 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1066 | break; |
1067 | case SIOCADDPRL: | |
1068 | case SIOCCHGPRL: | |
fadf6bf0 | 1069 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1070 | break; |
1071 | } | |
2b4743bd | 1072 | netdev_state_change(dev); |
fadf6bf0 TF |
1073 | break; |
1074 | ||
fa857afc YH |
1075 | #ifdef CONFIG_IPV6_SIT_6RD |
1076 | case SIOCADD6RD: | |
1077 | case SIOCCHG6RD: | |
1078 | case SIOCDEL6RD: | |
1079 | err = -EPERM; | |
1080 | if (!capable(CAP_NET_ADMIN)) | |
1081 | goto done; | |
1082 | ||
1083 | err = -EFAULT; | |
1084 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1085 | sizeof(ip6rd))) | |
1086 | goto done; | |
1087 | ||
1088 | t = netdev_priv(dev); | |
1089 | ||
1090 | if (cmd != SIOCDEL6RD) { | |
1091 | struct in6_addr prefix; | |
1092 | __be32 relay_prefix; | |
1093 | ||
1094 | err = -EINVAL; | |
1095 | if (ip6rd.relay_prefixlen > 32 || | |
1096 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1097 | goto done; | |
1098 | ||
1099 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1100 | ip6rd.prefixlen); | |
1101 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1102 | goto done; | |
91b2a3f9 YH |
1103 | if (ip6rd.relay_prefixlen) |
1104 | relay_prefix = ip6rd.relay_prefix & | |
1105 | htonl(0xffffffffUL << | |
1106 | (32 - ip6rd.relay_prefixlen)); | |
1107 | else | |
1108 | relay_prefix = 0; | |
fa857afc YH |
1109 | if (relay_prefix != ip6rd.relay_prefix) |
1110 | goto done; | |
1111 | ||
4e3fd7a0 | 1112 | t->ip6rd.prefix = prefix; |
fa857afc YH |
1113 | t->ip6rd.relay_prefix = relay_prefix; |
1114 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1115 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1116 | } else | |
e0c93948 | 1117 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1118 | |
1119 | err = 0; | |
1120 | break; | |
1121 | #endif | |
1122 | ||
1da177e4 LT |
1123 | default: |
1124 | err = -EINVAL; | |
1125 | } | |
1126 | ||
1127 | done: | |
1128 | return err; | |
1129 | } | |
1130 | ||
1da177e4 LT |
1131 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1132 | { | |
1133 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1134 | return -EINVAL; | |
1135 | dev->mtu = new_mtu; | |
1136 | return 0; | |
1137 | } | |
1138 | ||
1326c3d5 SH |
1139 | static const struct net_device_ops ipip6_netdev_ops = { |
1140 | .ndo_uninit = ipip6_tunnel_uninit, | |
1141 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1142 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1143 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
87b6d218 | 1144 | .ndo_get_stats64= ipip6_get_stats64, |
1326c3d5 SH |
1145 | }; |
1146 | ||
15fc1f70 ED |
1147 | static void ipip6_dev_free(struct net_device *dev) |
1148 | { | |
1149 | free_percpu(dev->tstats); | |
1150 | free_netdev(dev); | |
1151 | } | |
1152 | ||
1da177e4 LT |
1153 | static void ipip6_tunnel_setup(struct net_device *dev) |
1154 | { | |
1326c3d5 | 1155 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1156 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1157 | |
1158 | dev->type = ARPHRD_SIT; | |
1159 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1160 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1161 | dev->flags = IFF_NOARP; |
f2ba025b | 1162 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1163 | dev->iflink = 0; |
1164 | dev->addr_len = 4; | |
7a97146c | 1165 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1166 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1167 | } |
1168 | ||
15fc1f70 | 1169 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1170 | { |
1326c3d5 | 1171 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1172 | |
1173 | tunnel->dev = dev; | |
1da177e4 LT |
1174 | |
1175 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1176 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1177 | ||
8a4a50f9 | 1178 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1179 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1180 | if (!dev->tstats) | |
1181 | return -ENOMEM; | |
1182 | ||
1183 | return 0; | |
1da177e4 LT |
1184 | } |
1185 | ||
dd4080ee | 1186 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1187 | { |
2941a486 | 1188 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1189 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1190 | struct net *net = dev_net(dev); |
1191 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1192 | |
1193 | tunnel->dev = dev; | |
1194 | strcpy(tunnel->parms.name, dev->name); | |
1195 | ||
1196 | iph->version = 4; | |
1197 | iph->protocol = IPPROTO_IPV6; | |
1198 | iph->ihl = 5; | |
1199 | iph->ttl = 64; | |
1200 | ||
dd4080ee ED |
1201 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1202 | if (!dev->tstats) | |
1203 | return -ENOMEM; | |
1da177e4 | 1204 | dev_hold(dev); |
cf778b00 | 1205 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1206 | return 0; |
1da177e4 LT |
1207 | } |
1208 | ||
ba3e3f50 ND |
1209 | static size_t sit_get_size(const struct net_device *dev) |
1210 | { | |
1211 | return | |
1212 | /* IFLA_IPTUN_LINK */ | |
1213 | nla_total_size(4) + | |
1214 | /* IFLA_IPTUN_LOCAL */ | |
1215 | nla_total_size(4) + | |
1216 | /* IFLA_IPTUN_REMOTE */ | |
1217 | nla_total_size(4) + | |
1218 | /* IFLA_IPTUN_TTL */ | |
1219 | nla_total_size(1) + | |
1220 | /* IFLA_IPTUN_TOS */ | |
1221 | nla_total_size(1) + | |
1222 | 0; | |
1223 | } | |
1224 | ||
1225 | static int sit_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1226 | { | |
1227 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1228 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1229 | ||
1230 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1231 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1232 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1233 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
1234 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos)) | |
1235 | goto nla_put_failure; | |
1236 | return 0; | |
1237 | ||
1238 | nla_put_failure: | |
1239 | return -EMSGSIZE; | |
1240 | } | |
1241 | ||
1242 | static struct rtnl_link_ops sit_link_ops __read_mostly = { | |
1243 | .kind = "sit", | |
1244 | .maxtype = IFLA_IPTUN_MAX, | |
1245 | .priv_size = sizeof(struct ip_tunnel), | |
1246 | .get_size = sit_get_size, | |
1247 | .fill_info = sit_fill_info, | |
1248 | }; | |
1249 | ||
6dcd814b | 1250 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1251 | .handler = ipip6_rcv, |
1252 | .err_handler = ipip6_err, | |
c73cb5a2 | 1253 | .priority = 1, |
1da177e4 LT |
1254 | }; |
1255 | ||
2c8c1e72 | 1256 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1257 | { |
1258 | int prio; | |
1259 | ||
1260 | for (prio = 1; prio < 4; prio++) { | |
1261 | int h; | |
1262 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1263 | struct ip_tunnel *t; |
62808f91 | 1264 | |
753ea8e9 | 1265 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1266 | while (t != NULL) { |
1267 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1268 | t = rtnl_dereference(t->next); |
62808f91 | 1269 | } |
db44575f AK |
1270 | } |
1271 | } | |
1272 | } | |
1273 | ||
2c8c1e72 | 1274 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1275 | { |
67101172 | 1276 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1277 | struct ip_tunnel *t; |
8190d900 | 1278 | int err; |
8190d900 | 1279 | |
29182176 PE |
1280 | sitn->tunnels[0] = sitn->tunnels_wc; |
1281 | sitn->tunnels[1] = sitn->tunnels_l; | |
1282 | sitn->tunnels[2] = sitn->tunnels_r; | |
1283 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1284 | ||
cd3dbc19 PE |
1285 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1286 | ipip6_tunnel_setup); | |
1287 | if (!sitn->fb_tunnel_dev) { | |
1288 | err = -ENOMEM; | |
1289 | goto err_alloc_dev; | |
1290 | } | |
be77e593 | 1291 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1292 | |
dd4080ee ED |
1293 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1294 | if (err) | |
1295 | goto err_dev_free; | |
1296 | ||
e0c93948 | 1297 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1298 | |
1299 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1300 | goto err_reg_dev; | |
1301 | ||
72b36015 TF |
1302 | t = netdev_priv(sitn->fb_tunnel_dev); |
1303 | ||
1304 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1305 | return 0; |
1306 | ||
cd3dbc19 | 1307 | err_reg_dev: |
1326c3d5 | 1308 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1309 | err_dev_free: |
1310 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1311 | err_alloc_dev: |
8190d900 PE |
1312 | return err; |
1313 | } | |
1314 | ||
2c8c1e72 | 1315 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1316 | { |
67101172 | 1317 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1318 | LIST_HEAD(list); |
8190d900 | 1319 | |
cd3dbc19 | 1320 | rtnl_lock(); |
62808f91 ED |
1321 | sit_destroy_tunnels(sitn, &list); |
1322 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1323 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1324 | rtnl_unlock(); |
8190d900 PE |
1325 | } |
1326 | ||
1327 | static struct pernet_operations sit_net_ops = { | |
1328 | .init = sit_init_net, | |
1329 | .exit = sit_exit_net, | |
67101172 EB |
1330 | .id = &sit_net_id, |
1331 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1332 | }; |
1333 | ||
89c89458 | 1334 | static void __exit sit_cleanup(void) |
1da177e4 | 1335 | { |
ba3e3f50 | 1336 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1337 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1338 | |
67101172 | 1339 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1340 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1341 | } |
1342 | ||
89c89458 | 1343 | static int __init sit_init(void) |
1da177e4 LT |
1344 | { |
1345 | int err; | |
1346 | ||
f3213831 | 1347 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1348 | |
67101172 | 1349 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1350 | if (err < 0) |
d5aa407f AD |
1351 | return err; |
1352 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1353 | if (err < 0) { | |
f3213831 | 1354 | pr_info("%s: can't add protocol\n", __func__); |
ba3e3f50 | 1355 | goto xfrm_tunnel_failed; |
d5aa407f | 1356 | } |
ba3e3f50 ND |
1357 | err = rtnl_link_register(&sit_link_ops); |
1358 | if (err < 0) | |
1359 | goto rtnl_link_failed; | |
1360 | ||
1361 | out: | |
1da177e4 | 1362 | return err; |
ba3e3f50 ND |
1363 | |
1364 | rtnl_link_failed: | |
1365 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1366 | xfrm_tunnel_failed: | |
1367 | unregister_pernet_device(&sit_net_ops); | |
1368 | goto out; | |
1da177e4 | 1369 | } |
989e5b96 JR |
1370 | |
1371 | module_init(sit_init); | |
1372 | module_exit(sit_cleanup); | |
39c85086 | 1373 | MODULE_LICENSE("GPL"); |
8909c9ad | 1374 | MODULE_ALIAS_NETDEV("sit0"); |