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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> | |
c5441932 | 52 | #include <net/ip_tunnels.h> |
1da177e4 LT |
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 | |
f4e0b4c5 ND |
68 | static bool log_ecn_error = true; |
69 | module_param(log_ecn_error, bool, 0644); | |
70 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
71 | ||
15fc1f70 | 72 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 73 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 74 | static void ipip6_dev_free(struct net_device *dev); |
218774dc HFS |
75 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
76 | __be32 *v4dst); | |
ba3e3f50 | 77 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 78 | |
f99189b1 | 79 | static int sit_net_id __read_mostly; |
8190d900 | 80 | struct sit_net { |
3a43be3c ED |
81 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
82 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
83 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
84 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
85 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 86 | |
cd3dbc19 | 87 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
88 | }; |
89 | ||
4543c10d ED |
90 | /* |
91 | * Must be invoked with rcu_read_lock | |
92 | */ | |
3e866703 | 93 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 94 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 95 | { |
3a43be3c ED |
96 | unsigned int h0 = HASH(remote); |
97 | unsigned int h1 = HASH(local); | |
1da177e4 | 98 | struct ip_tunnel *t; |
29182176 | 99 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 100 | |
e086cadc | 101 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 102 | if (local == t->parms.iph.saddr && |
4fddbf5d | 103 | remote == t->parms.iph.daddr && |
bc8fc7b8 | 104 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && |
4fddbf5d | 105 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
106 | return t; |
107 | } | |
e086cadc | 108 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d | 109 | if (remote == t->parms.iph.daddr && |
bc8fc7b8 | 110 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && |
4fddbf5d | 111 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
112 | return t; |
113 | } | |
e086cadc | 114 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d | 115 | if (local == t->parms.iph.saddr && |
bc8fc7b8 | 116 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && |
4fddbf5d | 117 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
118 | return t; |
119 | } | |
4543c10d | 120 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 121 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
122 | return t; |
123 | return NULL; | |
124 | } | |
125 | ||
3a43be3c | 126 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 127 | struct ip_tunnel_parm *parms) |
1da177e4 | 128 | { |
420fe234 YH |
129 | __be32 remote = parms->iph.daddr; |
130 | __be32 local = parms->iph.saddr; | |
3a43be3c | 131 | unsigned int h = 0; |
1da177e4 LT |
132 | int prio = 0; |
133 | ||
134 | if (remote) { | |
135 | prio |= 2; | |
136 | h ^= HASH(remote); | |
137 | } | |
138 | if (local) { | |
139 | prio |= 1; | |
140 | h ^= HASH(local); | |
141 | } | |
29182176 | 142 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
143 | } |
144 | ||
3a43be3c | 145 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 146 | struct ip_tunnel *t) |
420fe234 | 147 | { |
ca8def14 | 148 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
149 | } |
150 | ||
ca8def14 | 151 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 152 | { |
3a43be3c ED |
153 | struct ip_tunnel __rcu **tp; |
154 | struct ip_tunnel *iter; | |
155 | ||
156 | for (tp = ipip6_bucket(sitn, t); | |
157 | (iter = rtnl_dereference(*tp)) != NULL; | |
158 | tp = &iter->next) { | |
159 | if (t == iter) { | |
cf778b00 | 160 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
161 | break; |
162 | } | |
163 | } | |
164 | } | |
165 | ||
ca8def14 | 166 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 167 | { |
3a43be3c | 168 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 169 | |
cf778b00 ED |
170 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
171 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
172 | } |
173 | ||
e0c93948 | 174 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
175 | { |
176 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
177 | struct ip_tunnel *t = netdev_priv(dev); |
178 | ||
fa857afc YH |
179 | if (t->dev == sitn->fb_tunnel_dev) { |
180 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
181 | t->ip6rd.relay_prefix = 0; | |
182 | t->ip6rd.prefixlen = 16; | |
183 | t->ip6rd.relay_prefixlen = 0; | |
184 | } else { | |
185 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
186 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
187 | } | |
188 | #endif | |
189 | } | |
190 | ||
f3723416 ND |
191 | static int ipip6_tunnel_create(struct net_device *dev) |
192 | { | |
193 | struct ip_tunnel *t = netdev_priv(dev); | |
194 | struct net *net = dev_net(dev); | |
195 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
196 | int err; | |
197 | ||
198 | err = ipip6_tunnel_init(dev); | |
199 | if (err < 0) | |
200 | goto out; | |
201 | ipip6_tunnel_clone_6rd(dev, sitn); | |
202 | ||
d440b720 | 203 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
204 | dev->priv_flags |= IFF_ISATAP; |
205 | ||
206 | err = register_netdevice(dev); | |
207 | if (err < 0) | |
208 | goto out; | |
209 | ||
210 | strcpy(t->parms.name, dev->name); | |
211 | dev->rtnl_link_ops = &sit_link_ops; | |
212 | ||
213 | dev_hold(dev); | |
214 | ||
215 | ipip6_tunnel_link(sitn, t); | |
216 | return 0; | |
217 | ||
218 | out: | |
219 | return err; | |
220 | } | |
221 | ||
3a43be3c | 222 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 223 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 224 | { |
e69a4adc AV |
225 | __be32 remote = parms->iph.daddr; |
226 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
227 | struct ip_tunnel *t, *nt; |
228 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 229 | struct net_device *dev; |
1da177e4 | 230 | char name[IFNAMSIZ]; |
ca8def14 | 231 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 232 | |
3a43be3c ED |
233 | for (tp = __ipip6_bucket(sitn, parms); |
234 | (t = rtnl_dereference(*tp)) != NULL; | |
235 | tp = &t->next) { | |
8db99e57 | 236 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
237 | remote == t->parms.iph.daddr && |
238 | parms->link == t->parms.link) { | |
8db99e57 SH |
239 | if (create) |
240 | return NULL; | |
241 | else | |
242 | return t; | |
243 | } | |
1da177e4 LT |
244 | } |
245 | if (!create) | |
246 | goto failed; | |
247 | ||
248 | if (parms->name[0]) | |
249 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 250 | else |
15fc1f70 | 251 | strcpy(name, "sit%d"); |
1da177e4 | 252 | |
c835a677 TG |
253 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
254 | ipip6_tunnel_setup); | |
1da177e4 LT |
255 | if (dev == NULL) |
256 | return NULL; | |
257 | ||
7a97146c PE |
258 | dev_net_set(dev, net); |
259 | ||
2941a486 | 260 | nt = netdev_priv(dev); |
1326c3d5 | 261 | |
1da177e4 | 262 | nt->parms = *parms; |
f3723416 | 263 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 264 | goto failed_free; |
1da177e4 | 265 | |
1da177e4 LT |
266 | return nt; |
267 | ||
b37d428b | 268 | failed_free: |
15fc1f70 | 269 | ipip6_dev_free(dev); |
1da177e4 LT |
270 | failed: |
271 | return NULL; | |
272 | } | |
273 | ||
ef9a9d11 ED |
274 | #define for_each_prl_rcu(start) \ |
275 | for (prl = rcu_dereference(start); \ | |
276 | prl; \ | |
277 | prl = rcu_dereference(prl->next)) | |
278 | ||
fadf6bf0 | 279 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 280 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 281 | { |
ef9a9d11 | 282 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 283 | |
ef9a9d11 ED |
284 | for_each_prl_rcu(t->prl) |
285 | if (prl->addr == addr) | |
fadf6bf0 | 286 | break; |
ef9a9d11 | 287 | return prl; |
fadf6bf0 TF |
288 | |
289 | } | |
290 | ||
2b4743bd YH |
291 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
292 | struct ip_tunnel_prl __user *a) | |
300aaeea | 293 | { |
2b4743bd | 294 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
295 | struct ip_tunnel_prl_entry *prl; |
296 | unsigned int cmax, c = 0, ca, len; | |
297 | int ret = 0; | |
298 | ||
2b4743bd YH |
299 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
300 | return -EFAULT; | |
301 | cmax = kprl.datalen / sizeof(kprl); | |
302 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
303 | cmax = 1; |
304 | ||
305 | /* For simple GET or for root users, | |
306 | * we try harder to allocate. | |
307 | */ | |
308 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
309 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
310 | NULL; | |
311 | ||
ef9a9d11 | 312 | rcu_read_lock(); |
300aaeea YH |
313 | |
314 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
315 | ||
316 | if (!kp) { | |
317 | /* We don't try hard to allocate much memory for | |
318 | * non-root users. | |
319 | * For root users, retry allocating enough memory for | |
320 | * the answer. | |
321 | */ | |
322 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
323 | if (!kp) { | |
324 | ret = -ENOMEM; | |
325 | goto out; | |
326 | } | |
327 | } | |
328 | ||
329 | c = 0; | |
ef9a9d11 | 330 | for_each_prl_rcu(t->prl) { |
298bf12d | 331 | if (c >= cmax) |
300aaeea | 332 | break; |
2b4743bd | 333 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
334 | continue; |
335 | kp[c].addr = prl->addr; | |
336 | kp[c].flags = prl->flags; | |
337 | c++; | |
2b4743bd | 338 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
339 | break; |
340 | } | |
341 | out: | |
ef9a9d11 | 342 | rcu_read_unlock(); |
300aaeea YH |
343 | |
344 | len = sizeof(*kp) * c; | |
2b4743bd YH |
345 | ret = 0; |
346 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
347 | ret = -EFAULT; | |
300aaeea YH |
348 | |
349 | kfree(kp); | |
300aaeea | 350 | |
2b4743bd | 351 | return ret; |
300aaeea YH |
352 | } |
353 | ||
fadf6bf0 TF |
354 | static int |
355 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
356 | { | |
357 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
358 | int err = 0; |
359 | ||
0009ae1f YH |
360 | if (a->addr == htonl(INADDR_ANY)) |
361 | return -EINVAL; | |
362 | ||
aac4dddc | 363 | ASSERT_RTNL(); |
fadf6bf0 | 364 | |
3a43be3c | 365 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 366 | if (p->addr == a->addr) { |
ef9a9d11 ED |
367 | if (chg) { |
368 | p->flags = a->flags; | |
369 | goto out; | |
370 | } | |
3fcfa129 YH |
371 | err = -EEXIST; |
372 | goto out; | |
fadf6bf0 TF |
373 | } |
374 | } | |
375 | ||
3fcfa129 YH |
376 | if (chg) { |
377 | err = -ENXIO; | |
378 | goto out; | |
379 | } | |
fadf6bf0 TF |
380 | |
381 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
382 | if (!p) { |
383 | err = -ENOBUFS; | |
384 | goto out; | |
385 | } | |
fadf6bf0 | 386 | |
fadf6bf0 | 387 | p->next = t->prl; |
300aaeea YH |
388 | p->addr = a->addr; |
389 | p->flags = a->flags; | |
ef9a9d11 | 390 | t->prl_count++; |
cf778b00 | 391 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 392 | out: |
3fcfa129 | 393 | return err; |
fadf6bf0 TF |
394 | } |
395 | ||
ef9a9d11 ED |
396 | static void prl_list_destroy_rcu(struct rcu_head *head) |
397 | { | |
398 | struct ip_tunnel_prl_entry *p, *n; | |
399 | ||
400 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
401 | do { | |
753ea8e9 | 402 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
403 | kfree(p); |
404 | p = n; | |
405 | } while (p); | |
406 | } | |
407 | ||
fadf6bf0 TF |
408 | static int |
409 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
410 | { | |
753ea8e9 ED |
411 | struct ip_tunnel_prl_entry *x; |
412 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
413 | int err = 0; |
414 | ||
aac4dddc | 415 | ASSERT_RTNL(); |
fadf6bf0 | 416 | |
0009ae1f | 417 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
418 | for (p = &t->prl; |
419 | (x = rtnl_dereference(*p)) != NULL; | |
420 | p = &x->next) { | |
421 | if (x->addr == a->addr) { | |
fadf6bf0 | 422 | *p = x->next; |
11c476f3 | 423 | kfree_rcu(x, rcu_head); |
300aaeea | 424 | t->prl_count--; |
3fcfa129 | 425 | goto out; |
fadf6bf0 TF |
426 | } |
427 | } | |
3fcfa129 | 428 | err = -ENXIO; |
fadf6bf0 | 429 | } else { |
753ea8e9 ED |
430 | x = rtnl_dereference(t->prl); |
431 | if (x) { | |
ef9a9d11 | 432 | t->prl_count = 0; |
ef9a9d11 ED |
433 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
434 | t->prl = NULL; | |
fadf6bf0 TF |
435 | } |
436 | } | |
3fcfa129 | 437 | out: |
4b279601 | 438 | return err; |
fadf6bf0 TF |
439 | } |
440 | ||
fadf6bf0 | 441 | static int |
b71d1d42 | 442 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 443 | { |
3fcfa129 | 444 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
445 | int ok = 1; |
446 | ||
ef9a9d11 | 447 | rcu_read_lock(); |
3fcfa129 | 448 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 449 | if (p) { |
300aaeea | 450 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
451 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
452 | else | |
453 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
454 | } else { | |
b71d1d42 ED |
455 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
456 | ||
fadf6bf0 TF |
457 | if (ipv6_addr_is_isatap(addr6) && |
458 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 459 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
460 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
461 | else | |
462 | ok = 0; | |
463 | } | |
ef9a9d11 | 464 | rcu_read_unlock(); |
fadf6bf0 TF |
465 | return ok; |
466 | } | |
467 | ||
1da177e4 LT |
468 | static void ipip6_tunnel_uninit(struct net_device *dev) |
469 | { | |
5e6700b3 ND |
470 | struct ip_tunnel *tunnel = netdev_priv(dev); |
471 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 472 | |
cd3dbc19 | 473 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 474 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 475 | } else { |
5e6700b3 ND |
476 | ipip6_tunnel_unlink(sitn, tunnel); |
477 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 478 | } |
cf71d2bc | 479 | ip_tunnel_dst_reset_all(tunnel); |
3a43be3c | 480 | dev_put(dev); |
1da177e4 LT |
481 | } |
482 | ||
ca15a078 OG |
483 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
484 | * if sufficient data bytes are available | |
485 | */ | |
486 | static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb) | |
487 | { | |
488 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
489 | struct rt6_info *rt; | |
490 | struct sk_buff *skb2; | |
491 | ||
492 | if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct ipv6hdr) + 8)) | |
493 | return 1; | |
494 | ||
495 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
496 | ||
497 | if (!skb2) | |
498 | return 1; | |
499 | ||
500 | skb_dst_drop(skb2); | |
501 | skb_pull(skb2, iph->ihl * 4); | |
502 | skb_reset_network_header(skb2); | |
503 | ||
504 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); | |
505 | ||
506 | if (rt && rt->dst.dev) | |
507 | skb2->dev = rt->dst.dev; | |
508 | ||
509 | icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); | |
510 | ||
511 | if (rt) | |
512 | ip6_rt_put(rt); | |
513 | ||
514 | kfree_skb(skb2); | |
515 | ||
516 | return 0; | |
517 | } | |
1da177e4 | 518 | |
c73cb5a2 | 519 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 520 | { |
b71d1d42 | 521 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
522 | const int type = icmp_hdr(skb)->type; |
523 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 524 | struct ip_tunnel *t; |
c73cb5a2 | 525 | int err; |
1da177e4 LT |
526 | |
527 | switch (type) { | |
528 | default: | |
529 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 530 | return 0; |
1da177e4 LT |
531 | |
532 | case ICMP_DEST_UNREACH: | |
533 | switch (code) { | |
534 | case ICMP_SR_FAILED: | |
1da177e4 | 535 | /* Impossible event. */ |
c73cb5a2 | 536 | return 0; |
1da177e4 LT |
537 | default: |
538 | /* All others are translated to HOST_UNREACH. | |
539 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
540 | I believe they are just ether pollution. --ANK | |
541 | */ | |
542 | break; | |
543 | } | |
544 | break; | |
545 | case ICMP_TIME_EXCEEDED: | |
546 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 547 | return 0; |
1da177e4 | 548 | break; |
ec18d9a2 DM |
549 | case ICMP_REDIRECT: |
550 | break; | |
1da177e4 LT |
551 | } |
552 | ||
c73cb5a2 KM |
553 | err = -ENOENT; |
554 | ||
4fddbf5d SH |
555 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
556 | skb->dev, | |
557 | iph->daddr, | |
558 | iph->saddr); | |
36393395 DM |
559 | if (t == NULL) |
560 | goto out; | |
561 | ||
562 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
563 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
2346829e | 564 | t->parms.link, 0, IPPROTO_IPV6, 0); |
36393395 DM |
565 | err = 0; |
566 | goto out; | |
567 | } | |
ec18d9a2 | 568 | if (type == ICMP_REDIRECT) { |
2346829e | 569 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, |
ec18d9a2 DM |
570 | IPPROTO_IPV6, 0); |
571 | err = 0; | |
572 | goto out; | |
573 | } | |
36393395 DM |
574 | |
575 | if (t->parms.iph.daddr == 0) | |
1da177e4 | 576 | goto out; |
c73cb5a2 KM |
577 | |
578 | err = 0; | |
ca15a078 OG |
579 | if (!ipip6_err_gen_icmpv6_unreach(skb)) |
580 | goto out; | |
581 | ||
1da177e4 LT |
582 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
583 | goto out; | |
584 | ||
bb80087a | 585 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
586 | t->err_count++; |
587 | else | |
588 | t->err_count = 1; | |
589 | t->err_time = jiffies; | |
590 | out: | |
c73cb5a2 | 591 | return err; |
1da177e4 LT |
592 | } |
593 | ||
218774dc HFS |
594 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
595 | const struct in6_addr *v6addr) | |
596 | { | |
597 | __be32 v4embed = 0; | |
598 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
599 | return true; | |
600 | return false; | |
601 | } | |
602 | ||
7df37ff3 CB |
603 | /* Checks if an address matches an address on the tunnel interface. |
604 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
605 | * Long story: | |
606 | * This function is called after we considered the packet as spoofed | |
607 | * in is_spoofed_6rd. | |
608 | * We may have a router that is doing NAT for proto 41 packets | |
609 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
610 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
611 | * function will return true, dropping the packet. | |
612 | * But, we can still check if is spoofed against the IP | |
613 | * addresses associated with the interface. | |
614 | */ | |
615 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
616 | const struct in6_addr *v6dst) | |
617 | { | |
618 | int prefix_len; | |
619 | ||
620 | #ifdef CONFIG_IPV6_SIT_6RD | |
621 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
622 | - tunnel->ip6rd.relay_prefixlen; | |
623 | #else | |
624 | prefix_len = 48; | |
625 | #endif | |
626 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
627 | } | |
628 | ||
629 | /* Returns true if a packet is spoofed */ | |
630 | static bool packet_is_spoofed(struct sk_buff *skb, | |
631 | const struct iphdr *iph, | |
632 | struct ip_tunnel *tunnel) | |
633 | { | |
634 | const struct ipv6hdr *ipv6h; | |
635 | ||
636 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
637 | if (!isatap_chksrc(skb, iph, tunnel)) | |
638 | return true; | |
639 | ||
640 | return false; | |
641 | } | |
642 | ||
643 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
644 | return false; | |
645 | ||
646 | ipv6h = ipv6_hdr(skb); | |
647 | ||
648 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
649 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
650 | &iph->saddr, &ipv6h->saddr, | |
651 | &iph->daddr, &ipv6h->daddr); | |
652 | return true; | |
653 | } | |
654 | ||
655 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
656 | return false; | |
657 | ||
658 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
659 | return false; | |
660 | ||
661 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
662 | &iph->saddr, &ipv6h->saddr, | |
663 | &iph->daddr, &ipv6h->daddr); | |
664 | return true; | |
665 | } | |
666 | ||
1da177e4 LT |
667 | static int ipip6_rcv(struct sk_buff *skb) |
668 | { | |
1ad759d8 | 669 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 670 | struct ip_tunnel *tunnel; |
f4e0b4c5 | 671 | int err; |
1da177e4 | 672 | |
4fddbf5d SH |
673 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
674 | iph->saddr, iph->daddr); | |
675 | if (tunnel != NULL) { | |
8f84985f | 676 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 677 | |
32b8a8e5 ND |
678 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
679 | tunnel->parms.iph.protocol != 0) | |
680 | goto out; | |
681 | ||
b0e380b1 | 682 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 683 | skb_reset_network_header(skb); |
8cdfab8a | 684 | IPCB(skb)->flags = 0; |
1da177e4 | 685 | skb->protocol = htons(ETH_P_IPV6); |
c7dc89c0 | 686 | |
7df37ff3 CB |
687 | if (packet_is_spoofed(skb, iph, tunnel)) { |
688 | tunnel->dev->stats.rx_errors++; | |
689 | goto out; | |
f4e0b4c5 ND |
690 | } |
691 | ||
ea23192e | 692 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); |
f4e0b4c5 ND |
693 | |
694 | err = IP_ECN_decapsulate(iph, skb); | |
695 | if (unlikely(err)) { | |
696 | if (log_ecn_error) | |
697 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
698 | &iph->saddr, iph->tos); | |
699 | if (err > 1) { | |
700 | ++tunnel->dev->stats.rx_frame_errors; | |
701 | ++tunnel->dev->stats.rx_errors; | |
702 | goto out; | |
703 | } | |
c7dc89c0 | 704 | } |
d19d56dd | 705 | |
15fc1f70 | 706 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 707 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
708 | tstats->rx_packets++; |
709 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 710 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 711 | |
caf586e5 | 712 | netif_rx(skb); |
8990f468 | 713 | |
1da177e4 LT |
714 | return 0; |
715 | } | |
716 | ||
6dcdd1b3 | 717 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 718 | return 1; |
1da177e4 | 719 | out: |
36ca34cc | 720 | kfree_skb(skb); |
1da177e4 LT |
721 | return 0; |
722 | } | |
723 | ||
32b8a8e5 ND |
724 | static const struct tnl_ptk_info tpi = { |
725 | /* no tunnel info required for ipip. */ | |
726 | .proto = htons(ETH_P_IP), | |
727 | }; | |
728 | ||
729 | static int ipip_rcv(struct sk_buff *skb) | |
730 | { | |
3d7b46cd | 731 | const struct iphdr *iph; |
32b8a8e5 ND |
732 | struct ip_tunnel *tunnel; |
733 | ||
3d7b46cd | 734 | iph = ip_hdr(skb); |
32b8a8e5 ND |
735 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
736 | iph->saddr, iph->daddr); | |
737 | if (tunnel != NULL) { | |
738 | if (tunnel->parms.iph.protocol != IPPROTO_IPIP && | |
739 | tunnel->parms.iph.protocol != 0) | |
740 | goto drop; | |
741 | ||
742 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
743 | goto drop; | |
737e828b LH |
744 | if (iptunnel_pull_header(skb, 0, tpi.proto)) |
745 | goto drop; | |
32b8a8e5 ND |
746 | return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error); |
747 | } | |
748 | ||
749 | return 1; | |
750 | ||
751 | drop: | |
752 | kfree_skb(skb); | |
753 | return 0; | |
754 | } | |
755 | ||
fa857afc | 756 | /* |
218774dc HFS |
757 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
758 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 759 | */ |
218774dc HFS |
760 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
761 | __be32 *v4dst) | |
1da177e4 | 762 | { |
fa857afc YH |
763 | #ifdef CONFIG_IPV6_SIT_6RD |
764 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
765 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 766 | unsigned int pbw0, pbi0; |
fa857afc YH |
767 | int pbi1; |
768 | u32 d; | |
769 | ||
770 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
771 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
772 | ||
e7db38c3 | 773 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
774 | tunnel->ip6rd.relay_prefixlen; |
775 | ||
776 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
777 | if (pbi1 > 0) | |
e7db38c3 | 778 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
779 | (32 - pbi1); |
780 | ||
218774dc HFS |
781 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
782 | return true; | |
fa857afc YH |
783 | } |
784 | #else | |
1da177e4 | 785 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 786 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
787 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
788 | return true; | |
1da177e4 | 789 | } |
fa857afc | 790 | #endif |
218774dc HFS |
791 | return false; |
792 | } | |
793 | ||
794 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
795 | const struct in6_addr *v6dst) | |
796 | { | |
797 | __be32 dst = 0; | |
798 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
799 | return dst; |
800 | } | |
801 | ||
802 | /* | |
803 | * This function assumes it is being called from dev_queue_xmit() | |
804 | * and that skb is filled properly by that function. | |
805 | */ | |
806 | ||
6fef4c0c SH |
807 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
808 | struct net_device *dev) | |
1da177e4 | 809 | { |
2941a486 | 810 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
811 | const struct iphdr *tiph = &tunnel->parms.iph; |
812 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 813 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 814 | __be16 df = tiph->frag_off; |
1da177e4 | 815 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 816 | struct net_device *tdev; /* Device to other host */ |
c2636b4d | 817 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 818 | __be32 dst = tiph->daddr; |
31e4543d | 819 | struct flowi4 fl4; |
1da177e4 | 820 | int mtu; |
b71d1d42 | 821 | const struct in6_addr *addr6; |
1da177e4 | 822 | int addr_type; |
0e6fbc5b PS |
823 | u8 ttl; |
824 | int err; | |
1da177e4 | 825 | |
1da177e4 LT |
826 | if (skb->protocol != htons(ETH_P_IPV6)) |
827 | goto tx_error; | |
828 | ||
c2bceb3d LEM |
829 | if (tos == 1) |
830 | tos = ipv6_get_dsfield(iph6); | |
831 | ||
c7dc89c0 FT |
832 | /* ISATAP (RFC4214) - must come before 6to4 */ |
833 | if (dev->priv_flags & IFF_ISATAP) { | |
834 | struct neighbour *neigh = NULL; | |
1e2927b0 | 835 | bool do_tx_error = false; |
c7dc89c0 | 836 | |
adf30907 | 837 | if (skb_dst(skb)) |
1e2927b0 | 838 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
839 | |
840 | if (neigh == NULL) { | |
7df37ff3 | 841 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
842 | goto tx_error; |
843 | } | |
844 | ||
3e866703 | 845 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
846 | addr_type = ipv6_addr_type(addr6); |
847 | ||
848 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
849 | ipv6_addr_is_isatap(addr6)) | |
850 | dst = addr6->s6_addr32[3]; | |
851 | else | |
1e2927b0 DM |
852 | do_tx_error = true; |
853 | ||
854 | neigh_release(neigh); | |
855 | if (do_tx_error) | |
c7dc89c0 FT |
856 | goto tx_error; |
857 | } | |
858 | ||
1da177e4 | 859 | if (!dst) |
218774dc | 860 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
861 | |
862 | if (!dst) { | |
863 | struct neighbour *neigh = NULL; | |
1e2927b0 | 864 | bool do_tx_error = false; |
1da177e4 | 865 | |
adf30907 | 866 | if (skb_dst(skb)) |
1e2927b0 | 867 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
868 | |
869 | if (neigh == NULL) { | |
7df37ff3 | 870 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
871 | goto tx_error; |
872 | } | |
873 | ||
3e866703 | 874 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
875 | addr_type = ipv6_addr_type(addr6); |
876 | ||
877 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 878 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
879 | addr_type = ipv6_addr_type(addr6); |
880 | } | |
881 | ||
1e2927b0 DM |
882 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
883 | dst = addr6->s6_addr32[3]; | |
884 | else | |
885 | do_tx_error = true; | |
1da177e4 | 886 | |
1e2927b0 DM |
887 | neigh_release(neigh); |
888 | if (do_tx_error) | |
889 | goto tx_error; | |
1da177e4 LT |
890 | } |
891 | ||
5e6700b3 | 892 | rt = ip_route_output_ports(tunnel->net, &fl4, NULL, |
78fbfd8a DM |
893 | dst, tiph->saddr, |
894 | 0, 0, | |
895 | IPPROTO_IPV6, RT_TOS(tos), | |
896 | tunnel->parms.link); | |
897 | if (IS_ERR(rt)) { | |
898 | dev->stats.tx_carrier_errors++; | |
899 | goto tx_error_icmp; | |
1da177e4 LT |
900 | } |
901 | if (rt->rt_type != RTN_UNICAST) { | |
902 | ip_rt_put(rt); | |
15fc1f70 | 903 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
904 | goto tx_error_icmp; |
905 | } | |
d8d1f30b | 906 | tdev = rt->dst.dev; |
1da177e4 LT |
907 | |
908 | if (tdev == dev) { | |
909 | ip_rt_put(rt); | |
15fc1f70 | 910 | dev->stats.collisions++; |
1da177e4 LT |
911 | goto tx_error; |
912 | } | |
913 | ||
292f4f3c | 914 | if (df) { |
d8d1f30b | 915 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 916 | |
292f4f3c | 917 | if (mtu < 68) { |
15fc1f70 | 918 | dev->stats.collisions++; |
292f4f3c HX |
919 | ip_rt_put(rt); |
920 | goto tx_error; | |
921 | } | |
1da177e4 | 922 | |
292f4f3c HX |
923 | if (mtu < IPV6_MIN_MTU) { |
924 | mtu = IPV6_MIN_MTU; | |
925 | df = 0; | |
926 | } | |
927 | ||
928 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 929 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c | 930 | |
58a47824 | 931 | if (skb->len > mtu && !skb_is_gso(skb)) { |
3ffe533c | 932 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
933 | ip_rt_put(rt); |
934 | goto tx_error; | |
935 | } | |
1da177e4 LT |
936 | } |
937 | ||
938 | if (tunnel->err_count > 0) { | |
bb80087a WY |
939 | if (time_before(jiffies, |
940 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
941 | tunnel->err_count--; |
942 | dst_link_failure(skb); | |
943 | } else | |
944 | tunnel->err_count = 0; | |
945 | } | |
946 | ||
947 | /* | |
948 | * Okay, now see if we can stuff it in the buffer as-is. | |
949 | */ | |
950 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
951 | ||
cfbba49d PM |
952 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
953 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
954 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
955 | if (!new_skb) { | |
956 | ip_rt_put(rt); | |
15fc1f70 | 957 | dev->stats.tx_dropped++; |
66028310 | 958 | kfree_skb(skb); |
6ed10654 | 959 | return NETDEV_TX_OK; |
1da177e4 LT |
960 | } |
961 | if (skb->sk) | |
962 | skb_set_owner_w(new_skb, skb->sk); | |
963 | dev_kfree_skb(skb); | |
964 | skb = new_skb; | |
0660e03f | 965 | iph6 = ipv6_hdr(skb); |
1da177e4 | 966 | } |
0e6fbc5b PS |
967 | ttl = tiph->ttl; |
968 | if (ttl == 0) | |
969 | ttl = iph6->hop_limit; | |
970 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 971 | |
61c1db7f | 972 | skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT); |
6a9eadcc LR |
973 | if (IS_ERR(skb)) { |
974 | ip_rt_put(rt); | |
61c1db7f | 975 | goto out; |
6a9eadcc | 976 | } |
3d483058 | 977 | |
aad88724 ED |
978 | err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr, |
979 | IPPROTO_IPV6, tos, ttl, df, | |
980 | !net_eq(tunnel->net, dev_net(dev))); | |
0e6fbc5b | 981 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
6ed10654 | 982 | return NETDEV_TX_OK; |
1da177e4 LT |
983 | |
984 | tx_error_icmp: | |
985 | dst_link_failure(skb); | |
986 | tx_error: | |
66028310 | 987 | kfree_skb(skb); |
61c1db7f ED |
988 | out: |
989 | dev->stats.tx_errors++; | |
6ed10654 | 990 | return NETDEV_TX_OK; |
1da177e4 LT |
991 | } |
992 | ||
32b8a8e5 ND |
993 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
994 | { | |
995 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
996 | const struct iphdr *tiph = &tunnel->parms.iph; | |
997 | ||
61c1db7f ED |
998 | skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP); |
999 | if (IS_ERR(skb)) | |
1000 | goto out; | |
32b8a8e5 ND |
1001 | |
1002 | ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP); | |
1003 | return NETDEV_TX_OK; | |
61c1db7f ED |
1004 | out: |
1005 | dev->stats.tx_errors++; | |
1006 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1007 | } |
1008 | ||
1009 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1010 | struct net_device *dev) | |
1011 | { | |
1012 | switch (skb->protocol) { | |
1013 | case htons(ETH_P_IP): | |
1014 | ipip_tunnel_xmit(skb, dev); | |
1015 | break; | |
1016 | case htons(ETH_P_IPV6): | |
1017 | ipip6_tunnel_xmit(skb, dev); | |
1018 | break; | |
1019 | default: | |
1020 | goto tx_err; | |
1021 | } | |
1022 | ||
1023 | return NETDEV_TX_OK; | |
1024 | ||
1025 | tx_err: | |
1026 | dev->stats.tx_errors++; | |
66028310 | 1027 | kfree_skb(skb); |
32b8a8e5 ND |
1028 | return NETDEV_TX_OK; |
1029 | ||
1030 | } | |
1031 | ||
8a4a50f9 MS |
1032 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1033 | { | |
1034 | struct net_device *tdev = NULL; | |
1035 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1036 | const struct iphdr *iph; |
31e4543d | 1037 | struct flowi4 fl4; |
8a4a50f9 MS |
1038 | |
1039 | tunnel = netdev_priv(dev); | |
1040 | iph = &tunnel->parms.iph; | |
1041 | ||
1042 | if (iph->daddr) { | |
5e6700b3 ND |
1043 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1044 | NULL, | |
78fbfd8a DM |
1045 | iph->daddr, iph->saddr, |
1046 | 0, 0, | |
1047 | IPPROTO_IPV6, | |
1048 | RT_TOS(iph->tos), | |
1049 | tunnel->parms.link); | |
b23dd4fe DM |
1050 | |
1051 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1052 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1053 | ip_rt_put(rt); |
1054 | } | |
1055 | dev->flags |= IFF_POINTOPOINT; | |
1056 | } | |
1057 | ||
1058 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1059 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 MS |
1060 | |
1061 | if (tdev) { | |
1062 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
1063 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
1064 | if (dev->mtu < IPV6_MIN_MTU) | |
1065 | dev->mtu = IPV6_MIN_MTU; | |
1066 | } | |
1067 | dev->iflink = tunnel->parms.link; | |
1068 | } | |
1069 | ||
f3723416 ND |
1070 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) |
1071 | { | |
5e6700b3 | 1072 | struct net *net = t->net; |
f3723416 ND |
1073 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1074 | ||
1075 | ipip6_tunnel_unlink(sitn, t); | |
1076 | synchronize_net(); | |
1077 | t->parms.iph.saddr = p->iph.saddr; | |
1078 | t->parms.iph.daddr = p->iph.daddr; | |
1079 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1080 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1081 | ipip6_tunnel_link(sitn, t); | |
1082 | t->parms.iph.ttl = p->iph.ttl; | |
1083 | t->parms.iph.tos = p->iph.tos; | |
1084 | if (t->parms.link != p->link) { | |
1085 | t->parms.link = p->link; | |
1086 | ipip6_tunnel_bind_dev(t->dev); | |
1087 | } | |
cf71d2bc | 1088 | ip_tunnel_dst_reset_all(t); |
f3723416 ND |
1089 | netdev_state_change(t->dev); |
1090 | } | |
1091 | ||
e2f1f072 ND |
1092 | #ifdef CONFIG_IPV6_SIT_6RD |
1093 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1094 | struct ip_tunnel_6rd *ip6rd) | |
1095 | { | |
1096 | struct in6_addr prefix; | |
1097 | __be32 relay_prefix; | |
1098 | ||
1099 | if (ip6rd->relay_prefixlen > 32 || | |
1100 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1101 | return -EINVAL; | |
1102 | ||
1103 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1104 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1105 | return -EINVAL; | |
1106 | if (ip6rd->relay_prefixlen) | |
1107 | relay_prefix = ip6rd->relay_prefix & | |
1108 | htonl(0xffffffffUL << | |
1109 | (32 - ip6rd->relay_prefixlen)); | |
1110 | else | |
1111 | relay_prefix = 0; | |
1112 | if (relay_prefix != ip6rd->relay_prefix) | |
1113 | return -EINVAL; | |
1114 | ||
1115 | t->ip6rd.prefix = prefix; | |
1116 | t->ip6rd.relay_prefix = relay_prefix; | |
1117 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1118 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
cf71d2bc | 1119 | ip_tunnel_dst_reset_all(t); |
e2f1f072 ND |
1120 | netdev_state_change(t->dev); |
1121 | return 0; | |
1122 | } | |
1123 | #endif | |
1124 | ||
1da177e4 LT |
1125 | static int |
1126 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
1127 | { | |
1128 | int err = 0; | |
1129 | struct ip_tunnel_parm p; | |
fadf6bf0 | 1130 | struct ip_tunnel_prl prl; |
9aad77c3 ND |
1131 | struct ip_tunnel *t = netdev_priv(dev); |
1132 | struct net *net = t->net; | |
ca8def14 | 1133 | struct sit_net *sitn = net_generic(net, sit_net_id); |
fa857afc YH |
1134 | #ifdef CONFIG_IPV6_SIT_6RD |
1135 | struct ip_tunnel_6rd ip6rd; | |
1136 | #endif | |
1da177e4 LT |
1137 | |
1138 | switch (cmd) { | |
1139 | case SIOCGETTUNNEL: | |
fa857afc YH |
1140 | #ifdef CONFIG_IPV6_SIT_6RD |
1141 | case SIOCGET6RD: | |
1142 | #endif | |
cd3dbc19 | 1143 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1144 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1145 | err = -EFAULT; | |
1146 | break; | |
1147 | } | |
ca8def14 | 1148 | t = ipip6_tunnel_locate(net, &p, 0); |
9aad77c3 ND |
1149 | if (t == NULL) |
1150 | t = netdev_priv(dev); | |
1da177e4 | 1151 | } |
fa857afc YH |
1152 | |
1153 | err = -EFAULT; | |
1154 | if (cmd == SIOCGETTUNNEL) { | |
1155 | memcpy(&p, &t->parms, sizeof(p)); | |
1156 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1157 | sizeof(p))) | |
1158 | goto done; | |
1159 | #ifdef CONFIG_IPV6_SIT_6RD | |
1160 | } else { | |
4e3fd7a0 | 1161 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
1162 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
1163 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1164 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1165 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1166 | sizeof(ip6rd))) | |
1167 | goto done; | |
1168 | #endif | |
1169 | } | |
1170 | err = 0; | |
1da177e4 LT |
1171 | break; |
1172 | ||
1173 | case SIOCADDTUNNEL: | |
1174 | case SIOCCHGTUNNEL: | |
1175 | err = -EPERM; | |
af31f412 | 1176 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1177 | goto done; |
1178 | ||
1179 | err = -EFAULT; | |
1180 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1181 | goto done; | |
1182 | ||
1183 | err = -EINVAL; | |
32b8a8e5 ND |
1184 | if (p.iph.protocol != IPPROTO_IPV6 && |
1185 | p.iph.protocol != IPPROTO_IPIP && | |
1186 | p.iph.protocol != 0) | |
1187 | goto done; | |
1188 | if (p.iph.version != 4 || | |
1da177e4 LT |
1189 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
1190 | goto done; | |
1191 | if (p.iph.ttl) | |
1192 | p.iph.frag_off |= htons(IP_DF); | |
1193 | ||
ca8def14 | 1194 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1195 | |
cd3dbc19 | 1196 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1197 | if (t != NULL) { |
1198 | if (t->dev != dev) { | |
1199 | err = -EEXIST; | |
1200 | break; | |
1201 | } | |
1202 | } else { | |
1203 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1204 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1205 | err = -EINVAL; | |
1206 | break; | |
1207 | } | |
2941a486 | 1208 | t = netdev_priv(dev); |
1da177e4 | 1209 | } |
f9cd5a55 | 1210 | |
f3723416 | 1211 | ipip6_tunnel_update(t, &p); |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | if (t) { | |
1215 | err = 0; | |
1da177e4 LT |
1216 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1217 | err = -EFAULT; | |
1218 | } else | |
1219 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1220 | break; | |
1221 | ||
1222 | case SIOCDELTUNNEL: | |
1223 | err = -EPERM; | |
af31f412 | 1224 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1225 | goto done; |
1226 | ||
cd3dbc19 | 1227 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1228 | err = -EFAULT; |
1229 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1230 | goto done; | |
1231 | err = -ENOENT; | |
ca8def14 | 1232 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1233 | goto done; |
1234 | err = -EPERM; | |
cd3dbc19 | 1235 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1236 | goto done; |
1237 | dev = t->dev; | |
1238 | } | |
22f8cde5 SH |
1239 | unregister_netdevice(dev); |
1240 | err = 0; | |
1da177e4 LT |
1241 | break; |
1242 | ||
300aaeea | 1243 | case SIOCGETPRL: |
2b4743bd YH |
1244 | err = -EINVAL; |
1245 | if (dev == sitn->fb_tunnel_dev) | |
1246 | goto done; | |
2b4743bd YH |
1247 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); |
1248 | break; | |
1249 | ||
fadf6bf0 TF |
1250 | case SIOCADDPRL: |
1251 | case SIOCDELPRL: | |
1252 | case SIOCCHGPRL: | |
1253 | err = -EPERM; | |
af31f412 | 1254 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fadf6bf0 TF |
1255 | goto done; |
1256 | err = -EINVAL; | |
cd3dbc19 | 1257 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1258 | goto done; |
1259 | err = -EFAULT; | |
1260 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1261 | goto done; | |
fadf6bf0 | 1262 | |
300aaeea | 1263 | switch (cmd) { |
300aaeea | 1264 | case SIOCDELPRL: |
fadf6bf0 | 1265 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1266 | break; |
1267 | case SIOCADDPRL: | |
1268 | case SIOCCHGPRL: | |
fadf6bf0 | 1269 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1270 | break; |
1271 | } | |
cf71d2bc | 1272 | ip_tunnel_dst_reset_all(t); |
2b4743bd | 1273 | netdev_state_change(dev); |
fadf6bf0 TF |
1274 | break; |
1275 | ||
fa857afc YH |
1276 | #ifdef CONFIG_IPV6_SIT_6RD |
1277 | case SIOCADD6RD: | |
1278 | case SIOCCHG6RD: | |
1279 | case SIOCDEL6RD: | |
1280 | err = -EPERM; | |
af31f412 | 1281 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fa857afc YH |
1282 | goto done; |
1283 | ||
1284 | err = -EFAULT; | |
1285 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1286 | sizeof(ip6rd))) | |
1287 | goto done; | |
1288 | ||
fa857afc | 1289 | if (cmd != SIOCDEL6RD) { |
e2f1f072 ND |
1290 | err = ipip6_tunnel_update_6rd(t, &ip6rd); |
1291 | if (err < 0) | |
fa857afc | 1292 | goto done; |
fa857afc | 1293 | } else |
e0c93948 | 1294 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1295 | |
1296 | err = 0; | |
1297 | break; | |
1298 | #endif | |
1299 | ||
1da177e4 LT |
1300 | default: |
1301 | err = -EINVAL; | |
1302 | } | |
1303 | ||
1304 | done: | |
1305 | return err; | |
1306 | } | |
1307 | ||
1da177e4 LT |
1308 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1309 | { | |
1310 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1311 | return -EINVAL; | |
1312 | dev->mtu = new_mtu; | |
1313 | return 0; | |
1314 | } | |
1315 | ||
1326c3d5 SH |
1316 | static const struct net_device_ops ipip6_netdev_ops = { |
1317 | .ndo_uninit = ipip6_tunnel_uninit, | |
32b8a8e5 | 1318 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 SH |
1319 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
1320 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
f61dd388 | 1321 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1326c3d5 SH |
1322 | }; |
1323 | ||
15fc1f70 ED |
1324 | static void ipip6_dev_free(struct net_device *dev) |
1325 | { | |
cf71d2bc ND |
1326 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1327 | ||
1328 | free_percpu(tunnel->dst_cache); | |
15fc1f70 ED |
1329 | free_percpu(dev->tstats); |
1330 | free_netdev(dev); | |
1331 | } | |
1332 | ||
61c1db7f ED |
1333 | #define SIT_FEATURES (NETIF_F_SG | \ |
1334 | NETIF_F_FRAGLIST | \ | |
1335 | NETIF_F_HIGHDMA | \ | |
1336 | NETIF_F_GSO_SOFTWARE | \ | |
1337 | NETIF_F_HW_CSUM) | |
1338 | ||
1da177e4 LT |
1339 | static void ipip6_tunnel_setup(struct net_device *dev) |
1340 | { | |
1326c3d5 | 1341 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1342 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1343 | |
1344 | dev->type = ARPHRD_SIT; | |
1345 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1346 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1347 | dev->flags = IFF_NOARP; |
f2ba025b | 1348 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1349 | dev->iflink = 0; |
1350 | dev->addr_len = 4; | |
8df40d10 | 1351 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1352 | dev->features |= SIT_FEATURES; |
1353 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1354 | } |
1355 | ||
15fc1f70 | 1356 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1357 | { |
1326c3d5 | 1358 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1359 | |
1360 | tunnel->dev = dev; | |
5e6700b3 | 1361 | tunnel->net = dev_net(dev); |
1da177e4 LT |
1362 | |
1363 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1364 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1365 | ||
8a4a50f9 | 1366 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1367 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1368 | if (!dev->tstats) |
1369 | return -ENOMEM; | |
1370 | ||
cf71d2bc ND |
1371 | tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst); |
1372 | if (!tunnel->dst_cache) { | |
1373 | free_percpu(dev->tstats); | |
1374 | return -ENOMEM; | |
1375 | } | |
1376 | ||
15fc1f70 | 1377 | return 0; |
1da177e4 LT |
1378 | } |
1379 | ||
dd4080ee | 1380 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1381 | { |
2941a486 | 1382 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1383 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1384 | struct net *net = dev_net(dev); |
1385 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1386 | |
1387 | tunnel->dev = dev; | |
5e6700b3 | 1388 | tunnel->net = dev_net(dev); |
1da177e4 LT |
1389 | strcpy(tunnel->parms.name, dev->name); |
1390 | ||
1391 | iph->version = 4; | |
1392 | iph->protocol = IPPROTO_IPV6; | |
1393 | iph->ihl = 5; | |
1394 | iph->ttl = 64; | |
1395 | ||
1c213bd2 | 1396 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
dd4080ee ED |
1397 | if (!dev->tstats) |
1398 | return -ENOMEM; | |
827da44c | 1399 | |
cf71d2bc ND |
1400 | tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst); |
1401 | if (!tunnel->dst_cache) { | |
1402 | free_percpu(dev->tstats); | |
1403 | return -ENOMEM; | |
1404 | } | |
1405 | ||
1da177e4 | 1406 | dev_hold(dev); |
cf778b00 | 1407 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1408 | return 0; |
1da177e4 LT |
1409 | } |
1410 | ||
32b8a8e5 ND |
1411 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[]) |
1412 | { | |
1413 | u8 proto; | |
1414 | ||
c2ff682a | 1415 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1416 | return 0; |
1417 | ||
1418 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1419 | if (proto != IPPROTO_IPV6 && | |
1420 | proto != IPPROTO_IPIP && | |
1421 | proto != 0) | |
1422 | return -EINVAL; | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
f3723416 ND |
1427 | static void ipip6_netlink_parms(struct nlattr *data[], |
1428 | struct ip_tunnel_parm *parms) | |
1429 | { | |
1430 | memset(parms, 0, sizeof(*parms)); | |
1431 | ||
1432 | parms->iph.version = 4; | |
1433 | parms->iph.protocol = IPPROTO_IPV6; | |
1434 | parms->iph.ihl = 5; | |
1435 | parms->iph.ttl = 64; | |
1436 | ||
1437 | if (!data) | |
1438 | return; | |
1439 | ||
1440 | if (data[IFLA_IPTUN_LINK]) | |
1441 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1442 | ||
1443 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1444 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1445 | |
1446 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1447 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1448 | |
1449 | if (data[IFLA_IPTUN_TTL]) { | |
1450 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1451 | if (parms->iph.ttl) | |
1452 | parms->iph.frag_off = htons(IP_DF); | |
1453 | } | |
1454 | ||
1455 | if (data[IFLA_IPTUN_TOS]) | |
1456 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1457 | ||
1458 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1459 | parms->iph.frag_off = htons(IP_DF); | |
1460 | ||
1461 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1462 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1463 | |
1464 | if (data[IFLA_IPTUN_PROTO]) | |
1465 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1466 | ||
f3723416 ND |
1467 | } |
1468 | ||
e2f1f072 ND |
1469 | #ifdef CONFIG_IPV6_SIT_6RD |
1470 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1471 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1472 | struct ip_tunnel_6rd *ip6rd) | |
1473 | { | |
1474 | bool ret = false; | |
1475 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1476 | ||
1477 | if (!data) | |
1478 | return ret; | |
1479 | ||
1480 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1481 | ret = true; | |
1482 | nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], | |
1483 | sizeof(struct in6_addr)); | |
1484 | } | |
1485 | ||
1486 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1487 | ret = true; | |
1488 | ip6rd->relay_prefix = | |
1489 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1490 | } | |
1491 | ||
1492 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1493 | ret = true; | |
1494 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1495 | } | |
1496 | ||
1497 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1498 | ret = true; | |
1499 | ip6rd->relay_prefixlen = | |
1500 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1501 | } | |
1502 | ||
1503 | return ret; | |
1504 | } | |
1505 | #endif | |
1506 | ||
f3723416 ND |
1507 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
1508 | struct nlattr *tb[], struct nlattr *data[]) | |
1509 | { | |
1510 | struct net *net = dev_net(dev); | |
1511 | struct ip_tunnel *nt; | |
e2f1f072 ND |
1512 | #ifdef CONFIG_IPV6_SIT_6RD |
1513 | struct ip_tunnel_6rd ip6rd; | |
1514 | #endif | |
1515 | int err; | |
f3723416 ND |
1516 | |
1517 | nt = netdev_priv(dev); | |
1518 | ipip6_netlink_parms(data, &nt->parms); | |
1519 | ||
1520 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1521 | return -EEXIST; | |
1522 | ||
e2f1f072 ND |
1523 | err = ipip6_tunnel_create(dev); |
1524 | if (err < 0) | |
1525 | return err; | |
1526 | ||
1527 | #ifdef CONFIG_IPV6_SIT_6RD | |
1528 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1529 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1530 | #endif | |
1531 | ||
1532 | return err; | |
f3723416 ND |
1533 | } |
1534 | ||
1535 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
1536 | struct nlattr *data[]) | |
1537 | { | |
86bd68bf | 1538 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1539 | struct ip_tunnel_parm p; |
86bd68bf | 1540 | struct net *net = t->net; |
f3723416 | 1541 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1542 | #ifdef CONFIG_IPV6_SIT_6RD |
1543 | struct ip_tunnel_6rd ip6rd; | |
1544 | #endif | |
f3723416 ND |
1545 | |
1546 | if (dev == sitn->fb_tunnel_dev) | |
1547 | return -EINVAL; | |
1548 | ||
1549 | ipip6_netlink_parms(data, &p); | |
1550 | ||
1551 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1552 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1553 | return -EINVAL; | |
1554 | ||
1555 | t = ipip6_tunnel_locate(net, &p, 0); | |
1556 | ||
1557 | if (t) { | |
1558 | if (t->dev != dev) | |
1559 | return -EEXIST; | |
1560 | } else | |
1561 | t = netdev_priv(dev); | |
1562 | ||
1563 | ipip6_tunnel_update(t, &p); | |
e2f1f072 ND |
1564 | |
1565 | #ifdef CONFIG_IPV6_SIT_6RD | |
1566 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1567 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1568 | #endif | |
1569 | ||
f3723416 ND |
1570 | return 0; |
1571 | } | |
1572 | ||
e4c94a9c | 1573 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1574 | { |
1575 | return | |
1576 | /* IFLA_IPTUN_LINK */ | |
1577 | nla_total_size(4) + | |
1578 | /* IFLA_IPTUN_LOCAL */ | |
1579 | nla_total_size(4) + | |
1580 | /* IFLA_IPTUN_REMOTE */ | |
1581 | nla_total_size(4) + | |
1582 | /* IFLA_IPTUN_TTL */ | |
1583 | nla_total_size(1) + | |
1584 | /* IFLA_IPTUN_TOS */ | |
1585 | nla_total_size(1) + | |
a12c9a85 ND |
1586 | /* IFLA_IPTUN_PMTUDISC */ |
1587 | nla_total_size(1) + | |
1588 | /* IFLA_IPTUN_FLAGS */ | |
1589 | nla_total_size(2) + | |
32b8a8e5 ND |
1590 | /* IFLA_IPTUN_PROTO */ |
1591 | nla_total_size(1) + | |
e2f1f072 ND |
1592 | #ifdef CONFIG_IPV6_SIT_6RD |
1593 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1594 | nla_total_size(sizeof(struct in6_addr)) + | |
1595 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1596 | nla_total_size(4) + | |
1597 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1598 | nla_total_size(2) + | |
1599 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1600 | nla_total_size(2) + | |
1601 | #endif | |
ba3e3f50 ND |
1602 | 0; |
1603 | } | |
1604 | ||
e4c94a9c | 1605 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1606 | { |
1607 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1608 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1609 | ||
1610 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1611 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1612 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1613 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
a12c9a85 ND |
1614 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1615 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1616 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1617 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
d440b720 | 1618 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) |
ba3e3f50 | 1619 | goto nla_put_failure; |
e2f1f072 ND |
1620 | |
1621 | #ifdef CONFIG_IPV6_SIT_6RD | |
1622 | if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), | |
1623 | &tunnel->ip6rd.prefix) || | |
1624 | nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1625 | tunnel->ip6rd.relay_prefix) || | |
1626 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, | |
1627 | tunnel->ip6rd.prefixlen) || | |
1628 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1629 | tunnel->ip6rd.relay_prefixlen)) | |
1630 | goto nla_put_failure; | |
1631 | #endif | |
1632 | ||
ba3e3f50 ND |
1633 | return 0; |
1634 | ||
1635 | nla_put_failure: | |
1636 | return -EMSGSIZE; | |
1637 | } | |
1638 | ||
f3723416 ND |
1639 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1640 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1641 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1642 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1643 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1644 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1645 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1646 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1647 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1648 | #ifdef CONFIG_IPV6_SIT_6RD |
1649 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1650 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1651 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1652 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1653 | #endif | |
f3723416 ND |
1654 | }; |
1655 | ||
9434266f WB |
1656 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1657 | { | |
1658 | struct net *net = dev_net(dev); | |
1659 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1660 | ||
1661 | if (dev != sitn->fb_tunnel_dev) | |
1662 | unregister_netdevice_queue(dev, head); | |
1663 | } | |
1664 | ||
ba3e3f50 ND |
1665 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1666 | .kind = "sit", | |
1667 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1668 | .policy = ipip6_policy, |
ba3e3f50 | 1669 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1670 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1671 | .validate = ipip6_validate, |
f3723416 ND |
1672 | .newlink = ipip6_newlink, |
1673 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1674 | .get_size = ipip6_get_size, |
1675 | .fill_info = ipip6_fill_info, | |
9434266f | 1676 | .dellink = ipip6_dellink, |
ba3e3f50 ND |
1677 | }; |
1678 | ||
6dcd814b | 1679 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1680 | .handler = ipip6_rcv, |
1681 | .err_handler = ipip6_err, | |
c73cb5a2 | 1682 | .priority = 1, |
1da177e4 LT |
1683 | }; |
1684 | ||
32b8a8e5 ND |
1685 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1686 | .handler = ipip_rcv, | |
1687 | .err_handler = ipip6_err, | |
1688 | .priority = 2, | |
1689 | }; | |
1690 | ||
9434266f WB |
1691 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1692 | struct list_head *head) | |
db44575f | 1693 | { |
9434266f | 1694 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1695 | struct net_device *dev, *aux; |
db44575f AK |
1696 | int prio; |
1697 | ||
5e6700b3 ND |
1698 | for_each_netdev_safe(net, dev, aux) |
1699 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1700 | unregister_netdevice_queue(dev, head); | |
1701 | ||
db44575f AK |
1702 | for (prio = 1; prio < 4; prio++) { |
1703 | int h; | |
1704 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1705 | struct ip_tunnel *t; |
62808f91 | 1706 | |
753ea8e9 | 1707 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 | 1708 | while (t != NULL) { |
5e6700b3 ND |
1709 | /* If dev is in the same netns, it has already |
1710 | * been added to the list by the previous loop. | |
1711 | */ | |
fc8f999d | 1712 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1713 | unregister_netdevice_queue(t->dev, |
1714 | head); | |
753ea8e9 | 1715 | t = rtnl_dereference(t->next); |
62808f91 | 1716 | } |
db44575f AK |
1717 | } |
1718 | } | |
1719 | } | |
1720 | ||
2c8c1e72 | 1721 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1722 | { |
67101172 | 1723 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1724 | struct ip_tunnel *t; |
8190d900 | 1725 | int err; |
8190d900 | 1726 | |
29182176 PE |
1727 | sitn->tunnels[0] = sitn->tunnels_wc; |
1728 | sitn->tunnels[1] = sitn->tunnels_l; | |
1729 | sitn->tunnels[2] = sitn->tunnels_r; | |
1730 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1731 | ||
cd3dbc19 | 1732 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1733 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1734 | ipip6_tunnel_setup); |
1735 | if (!sitn->fb_tunnel_dev) { | |
1736 | err = -ENOMEM; | |
1737 | goto err_alloc_dev; | |
1738 | } | |
be77e593 | 1739 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1740 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1741 | /* FB netdevice is special: we have one, and only one per netns. |
1742 | * Allowing to move it to another netns is clearly unsafe. | |
1743 | */ | |
1744 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1745 | |
dd4080ee ED |
1746 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1747 | if (err) | |
1748 | goto err_dev_free; | |
1749 | ||
e0c93948 | 1750 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1751 | |
1752 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1753 | goto err_reg_dev; | |
1754 | ||
72b36015 TF |
1755 | t = netdev_priv(sitn->fb_tunnel_dev); |
1756 | ||
1757 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1758 | return 0; |
1759 | ||
cd3dbc19 | 1760 | err_reg_dev: |
1326c3d5 | 1761 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1762 | err_dev_free: |
1763 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1764 | err_alloc_dev: |
8190d900 PE |
1765 | return err; |
1766 | } | |
1767 | ||
2c8c1e72 | 1768 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1769 | { |
62808f91 | 1770 | LIST_HEAD(list); |
8190d900 | 1771 | |
cd3dbc19 | 1772 | rtnl_lock(); |
9434266f | 1773 | sit_destroy_tunnels(net, &list); |
62808f91 | 1774 | unregister_netdevice_many(&list); |
cd3dbc19 | 1775 | rtnl_unlock(); |
8190d900 PE |
1776 | } |
1777 | ||
1778 | static struct pernet_operations sit_net_ops = { | |
1779 | .init = sit_init_net, | |
1780 | .exit = sit_exit_net, | |
67101172 EB |
1781 | .id = &sit_net_id, |
1782 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1783 | }; |
1784 | ||
89c89458 | 1785 | static void __exit sit_cleanup(void) |
1da177e4 | 1786 | { |
ba3e3f50 | 1787 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1788 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1789 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
db44575f | 1790 | |
67101172 | 1791 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1792 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1793 | } |
1794 | ||
89c89458 | 1795 | static int __init sit_init(void) |
1da177e4 LT |
1796 | { |
1797 | int err; | |
1798 | ||
f3213831 | 1799 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1800 | |
67101172 | 1801 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1802 | if (err < 0) |
d5aa407f AD |
1803 | return err; |
1804 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1805 | if (err < 0) { | |
32b8a8e5 | 1806 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1807 | goto xfrm_tunnel_failed; |
d5aa407f | 1808 | } |
32b8a8e5 ND |
1809 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1810 | if (err < 0) { | |
1811 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1812 | goto xfrm_tunnel4_failed; | |
1813 | } | |
ba3e3f50 ND |
1814 | err = rtnl_link_register(&sit_link_ops); |
1815 | if (err < 0) | |
1816 | goto rtnl_link_failed; | |
1817 | ||
1818 | out: | |
1da177e4 | 1819 | return err; |
ba3e3f50 ND |
1820 | |
1821 | rtnl_link_failed: | |
32b8a8e5 ND |
1822 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
1823 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
1824 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1825 | xfrm_tunnel_failed: | |
1826 | unregister_pernet_device(&sit_net_ops); | |
1827 | goto out; | |
1da177e4 | 1828 | } |
989e5b96 JR |
1829 | |
1830 | module_init(sit_init); | |
1831 | module_exit(sit_cleanup); | |
39c85086 | 1832 | MODULE_LICENSE("GPL"); |
f98f89a0 | 1833 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 1834 | MODULE_ALIAS_NETDEV("sit0"); |