Commit | Line | Data |
---|---|---|
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 | |
15fc1f70 ED |
91 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
92 | struct pcpu_tstats { | |
87b6d218 | 93 | u64 rx_packets; |
94 | u64 rx_bytes; | |
95 | u64 tx_packets; | |
96 | u64 tx_bytes; | |
97 | struct u64_stats_sync syncp; | |
98 | }; | |
15fc1f70 | 99 | |
87b6d218 | 100 | static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, |
101 | struct rtnl_link_stats64 *tot) | |
15fc1f70 | 102 | { |
15fc1f70 ED |
103 | int i; |
104 | ||
105 | for_each_possible_cpu(i) { | |
106 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 107 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
108 | unsigned int start; | |
109 | ||
110 | do { | |
111 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
112 | rx_packets = tstats->rx_packets; | |
113 | tx_packets = tstats->tx_packets; | |
114 | rx_bytes = tstats->rx_bytes; | |
115 | tx_bytes = tstats->tx_bytes; | |
116 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
117 | ||
118 | tot->rx_packets += rx_packets; | |
119 | tot->tx_packets += tx_packets; | |
120 | tot->rx_bytes += rx_bytes; | |
121 | tot->tx_bytes += tx_bytes; | |
15fc1f70 | 122 | } |
87b6d218 | 123 | |
124 | tot->rx_errors = dev->stats.rx_errors; | |
125 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
126 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
127 | tot->tx_dropped = dev->stats.tx_dropped; | |
128 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
129 | tot->tx_errors = dev->stats.tx_errors; | |
130 | ||
131 | return tot; | |
15fc1f70 | 132 | } |
87b6d218 | 133 | |
4543c10d ED |
134 | /* |
135 | * Must be invoked with rcu_read_lock | |
136 | */ | |
3e866703 | 137 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 138 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 139 | { |
3a43be3c ED |
140 | unsigned int h0 = HASH(remote); |
141 | unsigned int h1 = HASH(local); | |
1da177e4 | 142 | struct ip_tunnel *t; |
29182176 | 143 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 144 | |
4543c10d | 145 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 146 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
147 | remote == t->parms.iph.daddr && |
148 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
149 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
150 | return t; |
151 | } | |
4543c10d | 152 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { |
4fddbf5d SH |
153 | if (remote == t->parms.iph.daddr && |
154 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
155 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
156 | return t; |
157 | } | |
4543c10d | 158 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { |
4fddbf5d SH |
159 | if (local == t->parms.iph.saddr && |
160 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
161 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
162 | return t; |
163 | } | |
4543c10d | 164 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 165 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
166 | return t; |
167 | return NULL; | |
168 | } | |
169 | ||
3a43be3c | 170 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 171 | struct ip_tunnel_parm *parms) |
1da177e4 | 172 | { |
420fe234 YH |
173 | __be32 remote = parms->iph.daddr; |
174 | __be32 local = parms->iph.saddr; | |
3a43be3c | 175 | unsigned int h = 0; |
1da177e4 LT |
176 | int prio = 0; |
177 | ||
178 | if (remote) { | |
179 | prio |= 2; | |
180 | h ^= HASH(remote); | |
181 | } | |
182 | if (local) { | |
183 | prio |= 1; | |
184 | h ^= HASH(local); | |
185 | } | |
29182176 | 186 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
187 | } |
188 | ||
3a43be3c | 189 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 190 | struct ip_tunnel *t) |
420fe234 | 191 | { |
ca8def14 | 192 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
193 | } |
194 | ||
ca8def14 | 195 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 196 | { |
3a43be3c ED |
197 | struct ip_tunnel __rcu **tp; |
198 | struct ip_tunnel *iter; | |
199 | ||
200 | for (tp = ipip6_bucket(sitn, t); | |
201 | (iter = rtnl_dereference(*tp)) != NULL; | |
202 | tp = &iter->next) { | |
203 | if (t == iter) { | |
cf778b00 | 204 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
205 | break; |
206 | } | |
207 | } | |
208 | } | |
209 | ||
ca8def14 | 210 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 211 | { |
3a43be3c | 212 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 213 | |
cf778b00 ED |
214 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
215 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
216 | } |
217 | ||
e0c93948 | 218 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
219 | { |
220 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
221 | struct ip_tunnel *t = netdev_priv(dev); |
222 | ||
fa857afc YH |
223 | if (t->dev == sitn->fb_tunnel_dev) { |
224 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
225 | t->ip6rd.relay_prefix = 0; | |
226 | t->ip6rd.prefixlen = 16; | |
227 | t->ip6rd.relay_prefixlen = 0; | |
228 | } else { | |
229 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
230 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
231 | } | |
232 | #endif | |
233 | } | |
234 | ||
3a43be3c | 235 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 236 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 237 | { |
e69a4adc AV |
238 | __be32 remote = parms->iph.daddr; |
239 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
240 | struct ip_tunnel *t, *nt; |
241 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 242 | struct net_device *dev; |
1da177e4 | 243 | char name[IFNAMSIZ]; |
ca8def14 | 244 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 245 | |
3a43be3c ED |
246 | for (tp = __ipip6_bucket(sitn, parms); |
247 | (t = rtnl_dereference(*tp)) != NULL; | |
248 | tp = &t->next) { | |
8db99e57 | 249 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
250 | remote == t->parms.iph.daddr && |
251 | parms->link == t->parms.link) { | |
8db99e57 SH |
252 | if (create) |
253 | return NULL; | |
254 | else | |
255 | return t; | |
256 | } | |
1da177e4 LT |
257 | } |
258 | if (!create) | |
259 | goto failed; | |
260 | ||
261 | if (parms->name[0]) | |
262 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 263 | else |
15fc1f70 | 264 | strcpy(name, "sit%d"); |
1da177e4 LT |
265 | |
266 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
267 | if (dev == NULL) | |
268 | return NULL; | |
269 | ||
7a97146c PE |
270 | dev_net_set(dev, net); |
271 | ||
2941a486 | 272 | nt = netdev_priv(dev); |
1326c3d5 | 273 | |
1da177e4 | 274 | nt->parms = *parms; |
15fc1f70 ED |
275 | if (ipip6_tunnel_init(dev) < 0) |
276 | goto failed_free; | |
e0c93948 | 277 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 278 | |
c7dc89c0 FT |
279 | if (parms->i_flags & SIT_ISATAP) |
280 | dev->priv_flags |= IFF_ISATAP; | |
281 | ||
b37d428b PE |
282 | if (register_netdevice(dev) < 0) |
283 | goto failed_free; | |
1da177e4 | 284 | |
72b36015 | 285 | strcpy(nt->parms.name, dev->name); |
ba3e3f50 | 286 | dev->rtnl_link_ops = &sit_link_ops; |
72b36015 | 287 | |
1da177e4 LT |
288 | dev_hold(dev); |
289 | ||
ca8def14 | 290 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
291 | return nt; |
292 | ||
b37d428b | 293 | failed_free: |
15fc1f70 | 294 | ipip6_dev_free(dev); |
1da177e4 LT |
295 | failed: |
296 | return NULL; | |
297 | } | |
298 | ||
ef9a9d11 ED |
299 | #define for_each_prl_rcu(start) \ |
300 | for (prl = rcu_dereference(start); \ | |
301 | prl; \ | |
302 | prl = rcu_dereference(prl->next)) | |
303 | ||
fadf6bf0 | 304 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 305 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 306 | { |
ef9a9d11 | 307 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 308 | |
ef9a9d11 ED |
309 | for_each_prl_rcu(t->prl) |
310 | if (prl->addr == addr) | |
fadf6bf0 | 311 | break; |
ef9a9d11 | 312 | return prl; |
fadf6bf0 TF |
313 | |
314 | } | |
315 | ||
2b4743bd YH |
316 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
317 | struct ip_tunnel_prl __user *a) | |
300aaeea | 318 | { |
2b4743bd | 319 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
320 | struct ip_tunnel_prl_entry *prl; |
321 | unsigned int cmax, c = 0, ca, len; | |
322 | int ret = 0; | |
323 | ||
2b4743bd YH |
324 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
325 | return -EFAULT; | |
326 | cmax = kprl.datalen / sizeof(kprl); | |
327 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
328 | cmax = 1; |
329 | ||
330 | /* For simple GET or for root users, | |
331 | * we try harder to allocate. | |
332 | */ | |
333 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
334 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
335 | NULL; | |
336 | ||
ef9a9d11 | 337 | rcu_read_lock(); |
300aaeea YH |
338 | |
339 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
340 | ||
341 | if (!kp) { | |
342 | /* We don't try hard to allocate much memory for | |
343 | * non-root users. | |
344 | * For root users, retry allocating enough memory for | |
345 | * the answer. | |
346 | */ | |
347 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
348 | if (!kp) { | |
349 | ret = -ENOMEM; | |
350 | goto out; | |
351 | } | |
352 | } | |
353 | ||
354 | c = 0; | |
ef9a9d11 | 355 | for_each_prl_rcu(t->prl) { |
298bf12d | 356 | if (c >= cmax) |
300aaeea | 357 | break; |
2b4743bd | 358 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
359 | continue; |
360 | kp[c].addr = prl->addr; | |
361 | kp[c].flags = prl->flags; | |
362 | c++; | |
2b4743bd | 363 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
364 | break; |
365 | } | |
366 | out: | |
ef9a9d11 | 367 | rcu_read_unlock(); |
300aaeea YH |
368 | |
369 | len = sizeof(*kp) * c; | |
2b4743bd YH |
370 | ret = 0; |
371 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
372 | ret = -EFAULT; | |
300aaeea YH |
373 | |
374 | kfree(kp); | |
300aaeea | 375 | |
2b4743bd | 376 | return ret; |
300aaeea YH |
377 | } |
378 | ||
fadf6bf0 TF |
379 | static int |
380 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
381 | { | |
382 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
383 | int err = 0; |
384 | ||
0009ae1f YH |
385 | if (a->addr == htonl(INADDR_ANY)) |
386 | return -EINVAL; | |
387 | ||
aac4dddc | 388 | ASSERT_RTNL(); |
fadf6bf0 | 389 | |
3a43be3c | 390 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 391 | if (p->addr == a->addr) { |
ef9a9d11 ED |
392 | if (chg) { |
393 | p->flags = a->flags; | |
394 | goto out; | |
395 | } | |
3fcfa129 YH |
396 | err = -EEXIST; |
397 | goto out; | |
fadf6bf0 TF |
398 | } |
399 | } | |
400 | ||
3fcfa129 YH |
401 | if (chg) { |
402 | err = -ENXIO; | |
403 | goto out; | |
404 | } | |
fadf6bf0 TF |
405 | |
406 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
407 | if (!p) { |
408 | err = -ENOBUFS; | |
409 | goto out; | |
410 | } | |
fadf6bf0 | 411 | |
fadf6bf0 | 412 | p->next = t->prl; |
300aaeea YH |
413 | p->addr = a->addr; |
414 | p->flags = a->flags; | |
ef9a9d11 | 415 | t->prl_count++; |
cf778b00 | 416 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 417 | out: |
3fcfa129 | 418 | return err; |
fadf6bf0 TF |
419 | } |
420 | ||
ef9a9d11 ED |
421 | static void prl_list_destroy_rcu(struct rcu_head *head) |
422 | { | |
423 | struct ip_tunnel_prl_entry *p, *n; | |
424 | ||
425 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
426 | do { | |
753ea8e9 | 427 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
428 | kfree(p); |
429 | p = n; | |
430 | } while (p); | |
431 | } | |
432 | ||
fadf6bf0 TF |
433 | static int |
434 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
435 | { | |
753ea8e9 ED |
436 | struct ip_tunnel_prl_entry *x; |
437 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
438 | int err = 0; |
439 | ||
aac4dddc | 440 | ASSERT_RTNL(); |
fadf6bf0 | 441 | |
0009ae1f | 442 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
443 | for (p = &t->prl; |
444 | (x = rtnl_dereference(*p)) != NULL; | |
445 | p = &x->next) { | |
446 | if (x->addr == a->addr) { | |
fadf6bf0 | 447 | *p = x->next; |
11c476f3 | 448 | kfree_rcu(x, rcu_head); |
300aaeea | 449 | t->prl_count--; |
3fcfa129 | 450 | goto out; |
fadf6bf0 TF |
451 | } |
452 | } | |
3fcfa129 | 453 | err = -ENXIO; |
fadf6bf0 | 454 | } else { |
753ea8e9 ED |
455 | x = rtnl_dereference(t->prl); |
456 | if (x) { | |
ef9a9d11 | 457 | t->prl_count = 0; |
ef9a9d11 ED |
458 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
459 | t->prl = NULL; | |
fadf6bf0 TF |
460 | } |
461 | } | |
3fcfa129 | 462 | out: |
4b279601 | 463 | return err; |
fadf6bf0 TF |
464 | } |
465 | ||
fadf6bf0 | 466 | static int |
b71d1d42 | 467 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 468 | { |
3fcfa129 | 469 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
470 | int ok = 1; |
471 | ||
ef9a9d11 | 472 | rcu_read_lock(); |
3fcfa129 | 473 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 474 | if (p) { |
300aaeea | 475 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
476 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
477 | else | |
478 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
479 | } else { | |
b71d1d42 ED |
480 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
481 | ||
fadf6bf0 TF |
482 | if (ipv6_addr_is_isatap(addr6) && |
483 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 484 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
485 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
486 | else | |
487 | ok = 0; | |
488 | } | |
ef9a9d11 | 489 | rcu_read_unlock(); |
fadf6bf0 TF |
490 | return ok; |
491 | } | |
492 | ||
1da177e4 LT |
493 | static void ipip6_tunnel_uninit(struct net_device *dev) |
494 | { | |
ca8def14 PE |
495 | struct net *net = dev_net(dev); |
496 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
497 | ||
cd3dbc19 | 498 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 499 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 500 | } else { |
ca8def14 | 501 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 502 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 503 | } |
3a43be3c | 504 | dev_put(dev); |
1da177e4 LT |
505 | } |
506 | ||
507 | ||
c73cb5a2 | 508 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 509 | { |
1da177e4 | 510 | |
071f92d0 | 511 | /* All the routers (except for Linux) return only |
1da177e4 LT |
512 | 8 bytes of packet payload. It means, that precise relaying of |
513 | ICMP in the real Internet is absolutely infeasible. | |
514 | */ | |
b71d1d42 | 515 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
516 | const int type = icmp_hdr(skb)->type; |
517 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 518 | struct ip_tunnel *t; |
c73cb5a2 | 519 | int err; |
1da177e4 LT |
520 | |
521 | switch (type) { | |
522 | default: | |
523 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 524 | return 0; |
1da177e4 LT |
525 | |
526 | case ICMP_DEST_UNREACH: | |
527 | switch (code) { | |
528 | case ICMP_SR_FAILED: | |
529 | case ICMP_PORT_UNREACH: | |
530 | /* Impossible event. */ | |
c73cb5a2 | 531 | return 0; |
1da177e4 LT |
532 | default: |
533 | /* All others are translated to HOST_UNREACH. | |
534 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
535 | I believe they are just ether pollution. --ANK | |
536 | */ | |
537 | break; | |
538 | } | |
539 | break; | |
540 | case ICMP_TIME_EXCEEDED: | |
541 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 542 | return 0; |
1da177e4 | 543 | break; |
ec18d9a2 DM |
544 | case ICMP_REDIRECT: |
545 | break; | |
1da177e4 LT |
546 | } |
547 | ||
c73cb5a2 KM |
548 | err = -ENOENT; |
549 | ||
4fddbf5d SH |
550 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
551 | skb->dev, | |
552 | iph->daddr, | |
553 | iph->saddr); | |
36393395 DM |
554 | if (t == NULL) |
555 | goto out; | |
556 | ||
557 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
558 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
559 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
560 | err = 0; | |
561 | goto out; | |
562 | } | |
ec18d9a2 DM |
563 | if (type == ICMP_REDIRECT) { |
564 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
565 | IPPROTO_IPV6, 0); | |
566 | err = 0; | |
567 | goto out; | |
568 | } | |
36393395 DM |
569 | |
570 | if (t->parms.iph.daddr == 0) | |
1da177e4 | 571 | goto out; |
c73cb5a2 KM |
572 | |
573 | err = 0; | |
1da177e4 LT |
574 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
575 | goto out; | |
576 | ||
bb80087a | 577 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
578 | t->err_count++; |
579 | else | |
580 | t->err_count = 1; | |
581 | t->err_time = jiffies; | |
582 | out: | |
c73cb5a2 | 583 | return err; |
1da177e4 LT |
584 | } |
585 | ||
b71d1d42 | 586 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
587 | { |
588 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 589 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
590 | } |
591 | ||
592 | static int ipip6_rcv(struct sk_buff *skb) | |
593 | { | |
b71d1d42 | 594 | const struct iphdr *iph; |
1da177e4 LT |
595 | struct ip_tunnel *tunnel; |
596 | ||
597 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
598 | goto out; | |
599 | ||
eddc9ec5 | 600 | iph = ip_hdr(skb); |
1da177e4 | 601 | |
4fddbf5d SH |
602 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
603 | iph->saddr, iph->daddr); | |
604 | if (tunnel != NULL) { | |
15fc1f70 ED |
605 | struct pcpu_tstats *tstats; |
606 | ||
1da177e4 | 607 | secpath_reset(skb); |
b0e380b1 | 608 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 609 | skb_reset_network_header(skb); |
8cdfab8a | 610 | IPCB(skb)->flags = 0; |
1da177e4 LT |
611 | skb->protocol = htons(ETH_P_IPV6); |
612 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
613 | |
614 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 615 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 616 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
617 | kfree_skb(skb); |
618 | return 0; | |
619 | } | |
d19d56dd | 620 | |
15fc1f70 ED |
621 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
622 | tstats->rx_packets++; | |
623 | tstats->rx_bytes += skb->len; | |
624 | ||
625 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 626 | |
1da177e4 | 627 | ipip6_ecn_decapsulate(iph, skb); |
8990f468 | 628 | |
caf586e5 | 629 | netif_rx(skb); |
8990f468 | 630 | |
1da177e4 LT |
631 | return 0; |
632 | } | |
633 | ||
6dcdd1b3 | 634 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 635 | return 1; |
1da177e4 | 636 | out: |
36ca34cc | 637 | kfree_skb(skb); |
1da177e4 LT |
638 | return 0; |
639 | } | |
640 | ||
fa857afc YH |
641 | /* |
642 | * Returns the embedded IPv4 address if the IPv6 address | |
643 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
644 | */ | |
645 | static inline | |
b71d1d42 | 646 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) |
1da177e4 | 647 | { |
e69a4adc | 648 | __be32 dst = 0; |
1da177e4 | 649 | |
fa857afc YH |
650 | #ifdef CONFIG_IPV6_SIT_6RD |
651 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
652 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 653 | unsigned int pbw0, pbi0; |
fa857afc YH |
654 | int pbi1; |
655 | u32 d; | |
656 | ||
657 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
658 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
659 | ||
e7db38c3 | 660 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
661 | tunnel->ip6rd.relay_prefixlen; |
662 | ||
663 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
664 | if (pbi1 > 0) | |
e7db38c3 | 665 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
666 | (32 - pbi1); |
667 | ||
668 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
669 | } | |
670 | #else | |
1da177e4 | 671 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 672 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
673 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
674 | } | |
fa857afc | 675 | #endif |
1da177e4 LT |
676 | return dst; |
677 | } | |
678 | ||
679 | /* | |
680 | * This function assumes it is being called from dev_queue_xmit() | |
681 | * and that skb is filled properly by that function. | |
682 | */ | |
683 | ||
6fef4c0c SH |
684 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
685 | struct net_device *dev) | |
1da177e4 | 686 | { |
2941a486 | 687 | struct ip_tunnel *tunnel = netdev_priv(dev); |
15fc1f70 | 688 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
689 | const struct iphdr *tiph = &tunnel->parms.iph; |
690 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 691 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 692 | __be16 df = tiph->frag_off; |
1da177e4 | 693 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 694 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 695 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 696 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 697 | __be32 dst = tiph->daddr; |
31e4543d | 698 | struct flowi4 fl4; |
1da177e4 | 699 | int mtu; |
b71d1d42 | 700 | const struct in6_addr *addr6; |
1da177e4 LT |
701 | int addr_type; |
702 | ||
1da177e4 LT |
703 | if (skb->protocol != htons(ETH_P_IPV6)) |
704 | goto tx_error; | |
705 | ||
c2bceb3d LEM |
706 | if (tos == 1) |
707 | tos = ipv6_get_dsfield(iph6); | |
708 | ||
c7dc89c0 FT |
709 | /* ISATAP (RFC4214) - must come before 6to4 */ |
710 | if (dev->priv_flags & IFF_ISATAP) { | |
711 | struct neighbour *neigh = NULL; | |
1e2927b0 | 712 | bool do_tx_error = false; |
c7dc89c0 | 713 | |
adf30907 | 714 | if (skb_dst(skb)) |
1e2927b0 | 715 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
716 | |
717 | if (neigh == NULL) { | |
e87cc472 | 718 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
c7dc89c0 FT |
719 | goto tx_error; |
720 | } | |
721 | ||
3e866703 | 722 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
723 | addr_type = ipv6_addr_type(addr6); |
724 | ||
725 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
726 | ipv6_addr_is_isatap(addr6)) | |
727 | dst = addr6->s6_addr32[3]; | |
728 | else | |
1e2927b0 DM |
729 | do_tx_error = true; |
730 | ||
731 | neigh_release(neigh); | |
732 | if (do_tx_error) | |
c7dc89c0 FT |
733 | goto tx_error; |
734 | } | |
735 | ||
1da177e4 | 736 | if (!dst) |
fa857afc | 737 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
738 | |
739 | if (!dst) { | |
740 | struct neighbour *neigh = NULL; | |
1e2927b0 | 741 | bool do_tx_error = false; |
1da177e4 | 742 | |
adf30907 | 743 | if (skb_dst(skb)) |
1e2927b0 | 744 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
745 | |
746 | if (neigh == NULL) { | |
e87cc472 | 747 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
1da177e4 LT |
748 | goto tx_error; |
749 | } | |
750 | ||
3e866703 | 751 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
752 | addr_type = ipv6_addr_type(addr6); |
753 | ||
754 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 755 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
756 | addr_type = ipv6_addr_type(addr6); |
757 | } | |
758 | ||
1e2927b0 DM |
759 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
760 | dst = addr6->s6_addr32[3]; | |
761 | else | |
762 | do_tx_error = true; | |
1da177e4 | 763 | |
1e2927b0 DM |
764 | neigh_release(neigh); |
765 | if (do_tx_error) | |
766 | goto tx_error; | |
1da177e4 LT |
767 | } |
768 | ||
31e4543d | 769 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
770 | dst, tiph->saddr, |
771 | 0, 0, | |
772 | IPPROTO_IPV6, RT_TOS(tos), | |
773 | tunnel->parms.link); | |
774 | if (IS_ERR(rt)) { | |
775 | dev->stats.tx_carrier_errors++; | |
776 | goto tx_error_icmp; | |
1da177e4 LT |
777 | } |
778 | if (rt->rt_type != RTN_UNICAST) { | |
779 | ip_rt_put(rt); | |
15fc1f70 | 780 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
781 | goto tx_error_icmp; |
782 | } | |
d8d1f30b | 783 | tdev = rt->dst.dev; |
1da177e4 LT |
784 | |
785 | if (tdev == dev) { | |
786 | ip_rt_put(rt); | |
15fc1f70 | 787 | dev->stats.collisions++; |
1da177e4 LT |
788 | goto tx_error; |
789 | } | |
790 | ||
292f4f3c | 791 | if (df) { |
d8d1f30b | 792 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 793 | |
292f4f3c | 794 | if (mtu < 68) { |
15fc1f70 | 795 | dev->stats.collisions++; |
292f4f3c HX |
796 | ip_rt_put(rt); |
797 | goto tx_error; | |
798 | } | |
1da177e4 | 799 | |
292f4f3c HX |
800 | if (mtu < IPV6_MIN_MTU) { |
801 | mtu = IPV6_MIN_MTU; | |
802 | df = 0; | |
803 | } | |
804 | ||
805 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 806 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c HX |
807 | |
808 | if (skb->len > mtu) { | |
3ffe533c | 809 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
810 | ip_rt_put(rt); |
811 | goto tx_error; | |
812 | } | |
1da177e4 LT |
813 | } |
814 | ||
815 | if (tunnel->err_count > 0) { | |
bb80087a WY |
816 | if (time_before(jiffies, |
817 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
818 | tunnel->err_count--; |
819 | dst_link_failure(skb); | |
820 | } else | |
821 | tunnel->err_count = 0; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Okay, now see if we can stuff it in the buffer as-is. | |
826 | */ | |
827 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
828 | ||
cfbba49d PM |
829 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
830 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
831 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
832 | if (!new_skb) { | |
833 | ip_rt_put(rt); | |
15fc1f70 | 834 | dev->stats.tx_dropped++; |
1da177e4 | 835 | dev_kfree_skb(skb); |
6ed10654 | 836 | return NETDEV_TX_OK; |
1da177e4 LT |
837 | } |
838 | if (skb->sk) | |
839 | skb_set_owner_w(new_skb, skb->sk); | |
840 | dev_kfree_skb(skb); | |
841 | skb = new_skb; | |
0660e03f | 842 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
843 | } |
844 | ||
b0e380b1 | 845 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
846 | skb_push(skb, sizeof(struct iphdr)); |
847 | skb_reset_network_header(skb); | |
1da177e4 | 848 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 849 | IPCB(skb)->flags = 0; |
adf30907 | 850 | skb_dst_drop(skb); |
d8d1f30b | 851 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
852 | |
853 | /* | |
854 | * Push down and install the IPIP header. | |
855 | */ | |
856 | ||
eddc9ec5 | 857 | iph = ip_hdr(skb); |
1da177e4 LT |
858 | iph->version = 4; |
859 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 860 | iph->frag_off = df; |
1da177e4 LT |
861 | iph->protocol = IPPROTO_IPV6; |
862 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
301102cc DM |
863 | iph->daddr = fl4.daddr; |
864 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
865 | |
866 | if ((iph->ttl = tiph->ttl) == 0) | |
867 | iph->ttl = iph6->hop_limit; | |
868 | ||
869 | nf_reset(skb); | |
15fc1f70 ED |
870 | tstats = this_cpu_ptr(dev->tstats); |
871 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 872 | return NETDEV_TX_OK; |
1da177e4 LT |
873 | |
874 | tx_error_icmp: | |
875 | dst_link_failure(skb); | |
876 | tx_error: | |
15fc1f70 | 877 | dev->stats.tx_errors++; |
1da177e4 | 878 | dev_kfree_skb(skb); |
6ed10654 | 879 | return NETDEV_TX_OK; |
1da177e4 LT |
880 | } |
881 | ||
8a4a50f9 MS |
882 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
883 | { | |
884 | struct net_device *tdev = NULL; | |
885 | struct ip_tunnel *tunnel; | |
b71d1d42 | 886 | const struct iphdr *iph; |
31e4543d | 887 | struct flowi4 fl4; |
8a4a50f9 MS |
888 | |
889 | tunnel = netdev_priv(dev); | |
890 | iph = &tunnel->parms.iph; | |
891 | ||
892 | if (iph->daddr) { | |
31e4543d | 893 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
894 | iph->daddr, iph->saddr, |
895 | 0, 0, | |
896 | IPPROTO_IPV6, | |
897 | RT_TOS(iph->tos), | |
898 | tunnel->parms.link); | |
b23dd4fe DM |
899 | |
900 | if (!IS_ERR(rt)) { | |
d8d1f30b | 901 | tdev = rt->dst.dev; |
8a4a50f9 MS |
902 | ip_rt_put(rt); |
903 | } | |
904 | dev->flags |= IFF_POINTOPOINT; | |
905 | } | |
906 | ||
907 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 908 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
909 | |
910 | if (tdev) { | |
911 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
912 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
913 | if (dev->mtu < IPV6_MIN_MTU) | |
914 | dev->mtu = IPV6_MIN_MTU; | |
915 | } | |
916 | dev->iflink = tunnel->parms.link; | |
917 | } | |
918 | ||
1da177e4 LT |
919 | static int |
920 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
921 | { | |
922 | int err = 0; | |
923 | struct ip_tunnel_parm p; | |
fadf6bf0 | 924 | struct ip_tunnel_prl prl; |
1da177e4 | 925 | struct ip_tunnel *t; |
ca8def14 PE |
926 | struct net *net = dev_net(dev); |
927 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
928 | #ifdef CONFIG_IPV6_SIT_6RD |
929 | struct ip_tunnel_6rd ip6rd; | |
930 | #endif | |
1da177e4 LT |
931 | |
932 | switch (cmd) { | |
933 | case SIOCGETTUNNEL: | |
fa857afc YH |
934 | #ifdef CONFIG_IPV6_SIT_6RD |
935 | case SIOCGET6RD: | |
936 | #endif | |
1da177e4 | 937 | t = NULL; |
cd3dbc19 | 938 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
939 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
940 | err = -EFAULT; | |
941 | break; | |
942 | } | |
ca8def14 | 943 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
944 | } |
945 | if (t == NULL) | |
2941a486 | 946 | t = netdev_priv(dev); |
fa857afc YH |
947 | |
948 | err = -EFAULT; | |
949 | if (cmd == SIOCGETTUNNEL) { | |
950 | memcpy(&p, &t->parms, sizeof(p)); | |
951 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
952 | sizeof(p))) | |
953 | goto done; | |
954 | #ifdef CONFIG_IPV6_SIT_6RD | |
955 | } else { | |
4e3fd7a0 | 956 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
957 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
958 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
959 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
960 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
961 | sizeof(ip6rd))) | |
962 | goto done; | |
963 | #endif | |
964 | } | |
965 | err = 0; | |
1da177e4 LT |
966 | break; |
967 | ||
968 | case SIOCADDTUNNEL: | |
969 | case SIOCCHGTUNNEL: | |
970 | err = -EPERM; | |
971 | if (!capable(CAP_NET_ADMIN)) | |
972 | goto done; | |
973 | ||
974 | err = -EFAULT; | |
975 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
976 | goto done; | |
977 | ||
978 | err = -EINVAL; | |
979 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
980 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
981 | goto done; | |
982 | if (p.iph.ttl) | |
983 | p.iph.frag_off |= htons(IP_DF); | |
984 | ||
ca8def14 | 985 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 986 | |
cd3dbc19 | 987 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
988 | if (t != NULL) { |
989 | if (t->dev != dev) { | |
990 | err = -EEXIST; | |
991 | break; | |
992 | } | |
993 | } else { | |
994 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
995 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
996 | err = -EINVAL; | |
997 | break; | |
998 | } | |
2941a486 | 999 | t = netdev_priv(dev); |
ca8def14 | 1000 | ipip6_tunnel_unlink(sitn, t); |
74b0b85b | 1001 | synchronize_net(); |
1da177e4 LT |
1002 | t->parms.iph.saddr = p.iph.saddr; |
1003 | t->parms.iph.daddr = p.iph.daddr; | |
1004 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1005 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 1006 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
1007 | netdev_state_change(dev); |
1008 | } | |
1009 | } | |
1010 | ||
1011 | if (t) { | |
1012 | err = 0; | |
1013 | if (cmd == SIOCCHGTUNNEL) { | |
1014 | t->parms.iph.ttl = p.iph.ttl; | |
1015 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
1016 | if (t->parms.link != p.link) { |
1017 | t->parms.link = p.link; | |
1018 | ipip6_tunnel_bind_dev(dev); | |
1019 | netdev_state_change(dev); | |
1020 | } | |
1da177e4 LT |
1021 | } |
1022 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1023 | err = -EFAULT; | |
1024 | } else | |
1025 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1026 | break; | |
1027 | ||
1028 | case SIOCDELTUNNEL: | |
1029 | err = -EPERM; | |
1030 | if (!capable(CAP_NET_ADMIN)) | |
1031 | goto done; | |
1032 | ||
cd3dbc19 | 1033 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1034 | err = -EFAULT; |
1035 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1036 | goto done; | |
1037 | err = -ENOENT; | |
ca8def14 | 1038 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1039 | goto done; |
1040 | err = -EPERM; | |
cd3dbc19 | 1041 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1042 | goto done; |
1043 | dev = t->dev; | |
1044 | } | |
22f8cde5 SH |
1045 | unregister_netdevice(dev); |
1046 | err = 0; | |
1da177e4 LT |
1047 | break; |
1048 | ||
300aaeea | 1049 | case SIOCGETPRL: |
2b4743bd YH |
1050 | err = -EINVAL; |
1051 | if (dev == sitn->fb_tunnel_dev) | |
1052 | goto done; | |
1053 | err = -ENOENT; | |
1054 | if (!(t = netdev_priv(dev))) | |
1055 | goto done; | |
1056 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1057 | break; | |
1058 | ||
fadf6bf0 TF |
1059 | case SIOCADDPRL: |
1060 | case SIOCDELPRL: | |
1061 | case SIOCCHGPRL: | |
1062 | err = -EPERM; | |
2b4743bd | 1063 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1064 | goto done; |
1065 | err = -EINVAL; | |
cd3dbc19 | 1066 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1067 | goto done; |
1068 | err = -EFAULT; | |
1069 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1070 | goto done; | |
1071 | err = -ENOENT; | |
1072 | if (!(t = netdev_priv(dev))) | |
1073 | goto done; | |
1074 | ||
300aaeea | 1075 | switch (cmd) { |
300aaeea | 1076 | case SIOCDELPRL: |
fadf6bf0 | 1077 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1078 | break; |
1079 | case SIOCADDPRL: | |
1080 | case SIOCCHGPRL: | |
fadf6bf0 | 1081 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1082 | break; |
1083 | } | |
2b4743bd | 1084 | netdev_state_change(dev); |
fadf6bf0 TF |
1085 | break; |
1086 | ||
fa857afc YH |
1087 | #ifdef CONFIG_IPV6_SIT_6RD |
1088 | case SIOCADD6RD: | |
1089 | case SIOCCHG6RD: | |
1090 | case SIOCDEL6RD: | |
1091 | err = -EPERM; | |
1092 | if (!capable(CAP_NET_ADMIN)) | |
1093 | goto done; | |
1094 | ||
1095 | err = -EFAULT; | |
1096 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1097 | sizeof(ip6rd))) | |
1098 | goto done; | |
1099 | ||
1100 | t = netdev_priv(dev); | |
1101 | ||
1102 | if (cmd != SIOCDEL6RD) { | |
1103 | struct in6_addr prefix; | |
1104 | __be32 relay_prefix; | |
1105 | ||
1106 | err = -EINVAL; | |
1107 | if (ip6rd.relay_prefixlen > 32 || | |
1108 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1109 | goto done; | |
1110 | ||
1111 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1112 | ip6rd.prefixlen); | |
1113 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1114 | goto done; | |
91b2a3f9 YH |
1115 | if (ip6rd.relay_prefixlen) |
1116 | relay_prefix = ip6rd.relay_prefix & | |
1117 | htonl(0xffffffffUL << | |
1118 | (32 - ip6rd.relay_prefixlen)); | |
1119 | else | |
1120 | relay_prefix = 0; | |
fa857afc YH |
1121 | if (relay_prefix != ip6rd.relay_prefix) |
1122 | goto done; | |
1123 | ||
4e3fd7a0 | 1124 | t->ip6rd.prefix = prefix; |
fa857afc YH |
1125 | t->ip6rd.relay_prefix = relay_prefix; |
1126 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1127 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1128 | } else | |
e0c93948 | 1129 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1130 | |
1131 | err = 0; | |
1132 | break; | |
1133 | #endif | |
1134 | ||
1da177e4 LT |
1135 | default: |
1136 | err = -EINVAL; | |
1137 | } | |
1138 | ||
1139 | done: | |
1140 | return err; | |
1141 | } | |
1142 | ||
1da177e4 LT |
1143 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1144 | { | |
1145 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1146 | return -EINVAL; | |
1147 | dev->mtu = new_mtu; | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1326c3d5 SH |
1151 | static const struct net_device_ops ipip6_netdev_ops = { |
1152 | .ndo_uninit = ipip6_tunnel_uninit, | |
1153 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1154 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1155 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
87b6d218 | 1156 | .ndo_get_stats64= ipip6_get_stats64, |
1326c3d5 SH |
1157 | }; |
1158 | ||
15fc1f70 ED |
1159 | static void ipip6_dev_free(struct net_device *dev) |
1160 | { | |
1161 | free_percpu(dev->tstats); | |
1162 | free_netdev(dev); | |
1163 | } | |
1164 | ||
1da177e4 LT |
1165 | static void ipip6_tunnel_setup(struct net_device *dev) |
1166 | { | |
1326c3d5 | 1167 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1168 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1169 | |
1170 | dev->type = ARPHRD_SIT; | |
1171 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1172 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1173 | dev->flags = IFF_NOARP; |
f2ba025b | 1174 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1175 | dev->iflink = 0; |
1176 | dev->addr_len = 4; | |
7a97146c | 1177 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1178 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1179 | } |
1180 | ||
15fc1f70 | 1181 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1182 | { |
1326c3d5 | 1183 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1184 | |
1185 | tunnel->dev = dev; | |
1da177e4 LT |
1186 | |
1187 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1188 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1189 | ||
8a4a50f9 | 1190 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1191 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1192 | if (!dev->tstats) | |
1193 | return -ENOMEM; | |
1194 | ||
1195 | return 0; | |
1da177e4 LT |
1196 | } |
1197 | ||
dd4080ee | 1198 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1199 | { |
2941a486 | 1200 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1201 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1202 | struct net *net = dev_net(dev); |
1203 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1204 | |
1205 | tunnel->dev = dev; | |
1206 | strcpy(tunnel->parms.name, dev->name); | |
1207 | ||
1208 | iph->version = 4; | |
1209 | iph->protocol = IPPROTO_IPV6; | |
1210 | iph->ihl = 5; | |
1211 | iph->ttl = 64; | |
1212 | ||
dd4080ee ED |
1213 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1214 | if (!dev->tstats) | |
1215 | return -ENOMEM; | |
1da177e4 | 1216 | dev_hold(dev); |
cf778b00 | 1217 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1218 | return 0; |
1da177e4 LT |
1219 | } |
1220 | ||
ba3e3f50 ND |
1221 | static size_t sit_get_size(const struct net_device *dev) |
1222 | { | |
1223 | return | |
1224 | /* IFLA_IPTUN_LINK */ | |
1225 | nla_total_size(4) + | |
1226 | /* IFLA_IPTUN_LOCAL */ | |
1227 | nla_total_size(4) + | |
1228 | /* IFLA_IPTUN_REMOTE */ | |
1229 | nla_total_size(4) + | |
1230 | /* IFLA_IPTUN_TTL */ | |
1231 | nla_total_size(1) + | |
1232 | /* IFLA_IPTUN_TOS */ | |
1233 | nla_total_size(1) + | |
1234 | 0; | |
1235 | } | |
1236 | ||
1237 | static int sit_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1238 | { | |
1239 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1240 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1241 | ||
1242 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1243 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1244 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1245 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
1246 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos)) | |
1247 | goto nla_put_failure; | |
1248 | return 0; | |
1249 | ||
1250 | nla_put_failure: | |
1251 | return -EMSGSIZE; | |
1252 | } | |
1253 | ||
1254 | static struct rtnl_link_ops sit_link_ops __read_mostly = { | |
1255 | .kind = "sit", | |
1256 | .maxtype = IFLA_IPTUN_MAX, | |
1257 | .priv_size = sizeof(struct ip_tunnel), | |
1258 | .get_size = sit_get_size, | |
1259 | .fill_info = sit_fill_info, | |
1260 | }; | |
1261 | ||
6dcd814b | 1262 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1263 | .handler = ipip6_rcv, |
1264 | .err_handler = ipip6_err, | |
c73cb5a2 | 1265 | .priority = 1, |
1da177e4 LT |
1266 | }; |
1267 | ||
2c8c1e72 | 1268 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1269 | { |
1270 | int prio; | |
1271 | ||
1272 | for (prio = 1; prio < 4; prio++) { | |
1273 | int h; | |
1274 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1275 | struct ip_tunnel *t; |
62808f91 | 1276 | |
753ea8e9 | 1277 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1278 | while (t != NULL) { |
1279 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1280 | t = rtnl_dereference(t->next); |
62808f91 | 1281 | } |
db44575f AK |
1282 | } |
1283 | } | |
1284 | } | |
1285 | ||
2c8c1e72 | 1286 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1287 | { |
67101172 | 1288 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1289 | struct ip_tunnel *t; |
8190d900 | 1290 | int err; |
8190d900 | 1291 | |
29182176 PE |
1292 | sitn->tunnels[0] = sitn->tunnels_wc; |
1293 | sitn->tunnels[1] = sitn->tunnels_l; | |
1294 | sitn->tunnels[2] = sitn->tunnels_r; | |
1295 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1296 | ||
cd3dbc19 PE |
1297 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1298 | ipip6_tunnel_setup); | |
1299 | if (!sitn->fb_tunnel_dev) { | |
1300 | err = -ENOMEM; | |
1301 | goto err_alloc_dev; | |
1302 | } | |
be77e593 | 1303 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1304 | |
dd4080ee ED |
1305 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1306 | if (err) | |
1307 | goto err_dev_free; | |
1308 | ||
e0c93948 | 1309 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1310 | |
1311 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1312 | goto err_reg_dev; | |
1313 | ||
72b36015 TF |
1314 | t = netdev_priv(sitn->fb_tunnel_dev); |
1315 | ||
1316 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1317 | return 0; |
1318 | ||
cd3dbc19 | 1319 | err_reg_dev: |
1326c3d5 | 1320 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1321 | err_dev_free: |
1322 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1323 | err_alloc_dev: |
8190d900 PE |
1324 | return err; |
1325 | } | |
1326 | ||
2c8c1e72 | 1327 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1328 | { |
67101172 | 1329 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1330 | LIST_HEAD(list); |
8190d900 | 1331 | |
cd3dbc19 | 1332 | rtnl_lock(); |
62808f91 ED |
1333 | sit_destroy_tunnels(sitn, &list); |
1334 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1335 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1336 | rtnl_unlock(); |
8190d900 PE |
1337 | } |
1338 | ||
1339 | static struct pernet_operations sit_net_ops = { | |
1340 | .init = sit_init_net, | |
1341 | .exit = sit_exit_net, | |
67101172 EB |
1342 | .id = &sit_net_id, |
1343 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1344 | }; |
1345 | ||
89c89458 | 1346 | static void __exit sit_cleanup(void) |
1da177e4 | 1347 | { |
ba3e3f50 | 1348 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1349 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1350 | |
67101172 | 1351 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1352 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1353 | } |
1354 | ||
89c89458 | 1355 | static int __init sit_init(void) |
1da177e4 LT |
1356 | { |
1357 | int err; | |
1358 | ||
f3213831 | 1359 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1360 | |
67101172 | 1361 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1362 | if (err < 0) |
d5aa407f AD |
1363 | return err; |
1364 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1365 | if (err < 0) { | |
f3213831 | 1366 | pr_info("%s: can't add protocol\n", __func__); |
ba3e3f50 | 1367 | goto xfrm_tunnel_failed; |
d5aa407f | 1368 | } |
ba3e3f50 ND |
1369 | err = rtnl_link_register(&sit_link_ops); |
1370 | if (err < 0) | |
1371 | goto rtnl_link_failed; | |
1372 | ||
1373 | out: | |
1da177e4 | 1374 | return err; |
ba3e3f50 ND |
1375 | |
1376 | rtnl_link_failed: | |
1377 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1378 | xfrm_tunnel_failed: | |
1379 | unregister_pernet_device(&sit_net_ops); | |
1380 | goto out; | |
1da177e4 | 1381 | } |
989e5b96 JR |
1382 | |
1383 | module_init(sit_init); | |
1384 | module_exit(sit_cleanup); | |
39c85086 | 1385 | MODULE_LICENSE("GPL"); |
8909c9ad | 1386 | MODULE_ALIAS_NETDEV("sit0"); |