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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
4 | * Linux INET6 implementation | |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
9 | * | |
1da177e4 LT |
10 | * Changes: |
11 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
12 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 13 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
14 | */ |
15 | ||
f3213831 JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
1da177e4 | 18 | #include <linux/module.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/errno.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
1da177e4 LT |
24 | #include <linux/net.h> |
25 | #include <linux/in6.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/if_arp.h> | |
28 | #include <linux/icmp.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
7c0f6ba6 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 33 | #include <linux/if_ether.h> |
1da177e4 LT |
34 | |
35 | #include <net/sock.h> | |
36 | #include <net/snmp.h> | |
37 | ||
38 | #include <net/ipv6.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/transp_v6.h> | |
41 | #include <net/ip6_fib.h> | |
42 | #include <net/ip6_route.h> | |
43 | #include <net/ndisc.h> | |
44 | #include <net/addrconf.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/udp.h> | |
47 | #include <net/icmp.h> | |
c5441932 | 48 | #include <net/ip_tunnels.h> |
1da177e4 LT |
49 | #include <net/inet_ecn.h> |
50 | #include <net/xfrm.h> | |
51 | #include <net/dsfield.h> | |
8190d900 PE |
52 | #include <net/net_namespace.h> |
53 | #include <net/netns/generic.h> | |
1da177e4 LT |
54 | |
55 | /* | |
56 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
57 | ||
58 | For comments look at net/ipv4/ip_gre.c --ANK | |
59 | */ | |
60 | ||
e87a8f24 | 61 | #define IP6_SIT_HASH_SIZE 16 |
e69a4adc | 62 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 63 | |
f4e0b4c5 ND |
64 | static bool log_ecn_error = true; |
65 | module_param(log_ecn_error, bool, 0644); | |
66 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
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); |
218774dc HFS |
71 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
72 | __be32 *v4dst); | |
ba3e3f50 | 73 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 74 | |
c7d03a00 | 75 | static unsigned int sit_net_id __read_mostly; |
8190d900 | 76 | struct sit_net { |
e87a8f24 JK |
77 | struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; |
78 | struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; | |
79 | struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; | |
3a43be3c ED |
80 | struct ip_tunnel __rcu *tunnels_wc[1]; |
81 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 82 | |
cd3dbc19 | 83 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
84 | }; |
85 | ||
fd5d687b CH |
86 | static inline struct sit_net *dev_to_sit_net(struct net_device *dev) |
87 | { | |
88 | struct ip_tunnel *t = netdev_priv(dev); | |
89 | ||
90 | return net_generic(t->net, sit_net_id); | |
91 | } | |
92 | ||
4543c10d ED |
93 | /* |
94 | * Must be invoked with rcu_read_lock | |
95 | */ | |
3e866703 | 96 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
3051fbec DA |
97 | struct net_device *dev, |
98 | __be32 remote, __be32 local, | |
99 | int sifindex) | |
1da177e4 | 100 | { |
3a43be3c ED |
101 | unsigned int h0 = HASH(remote); |
102 | unsigned int h1 = HASH(local); | |
1da177e4 | 103 | struct ip_tunnel *t; |
29182176 | 104 | struct sit_net *sitn = net_generic(net, sit_net_id); |
3051fbec | 105 | int ifindex = dev ? dev->ifindex : 0; |
1da177e4 | 106 | |
e086cadc | 107 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 108 | if (local == t->parms.iph.saddr && |
4fddbf5d | 109 | remote == t->parms.iph.daddr && |
3051fbec DA |
110 | (!dev || !t->parms.link || ifindex == t->parms.link || |
111 | sifindex == t->parms.link) && | |
4fddbf5d | 112 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
113 | return t; |
114 | } | |
e086cadc | 115 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d | 116 | if (remote == t->parms.iph.daddr && |
3051fbec DA |
117 | (!dev || !t->parms.link || ifindex == t->parms.link || |
118 | sifindex == t->parms.link) && | |
4fddbf5d | 119 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
120 | return t; |
121 | } | |
e086cadc | 122 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d | 123 | if (local == t->parms.iph.saddr && |
3051fbec DA |
124 | (!dev || !t->parms.link || ifindex == t->parms.link || |
125 | sifindex == t->parms.link) && | |
4fddbf5d | 126 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
127 | return t; |
128 | } | |
4543c10d | 129 | t = rcu_dereference(sitn->tunnels_wc[0]); |
53b24b8f | 130 | if (t && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
131 | return t; |
132 | return NULL; | |
133 | } | |
134 | ||
3a43be3c | 135 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 136 | struct ip_tunnel_parm *parms) |
1da177e4 | 137 | { |
420fe234 YH |
138 | __be32 remote = parms->iph.daddr; |
139 | __be32 local = parms->iph.saddr; | |
3a43be3c | 140 | unsigned int h = 0; |
1da177e4 LT |
141 | int prio = 0; |
142 | ||
143 | if (remote) { | |
144 | prio |= 2; | |
145 | h ^= HASH(remote); | |
146 | } | |
147 | if (local) { | |
148 | prio |= 1; | |
149 | h ^= HASH(local); | |
150 | } | |
29182176 | 151 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
152 | } |
153 | ||
3a43be3c | 154 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 155 | struct ip_tunnel *t) |
420fe234 | 156 | { |
ca8def14 | 157 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
158 | } |
159 | ||
ca8def14 | 160 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 161 | { |
3a43be3c ED |
162 | struct ip_tunnel __rcu **tp; |
163 | struct ip_tunnel *iter; | |
164 | ||
165 | for (tp = ipip6_bucket(sitn, t); | |
166 | (iter = rtnl_dereference(*tp)) != NULL; | |
167 | tp = &iter->next) { | |
168 | if (t == iter) { | |
cf778b00 | 169 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
170 | break; |
171 | } | |
172 | } | |
173 | } | |
174 | ||
ca8def14 | 175 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 176 | { |
3a43be3c | 177 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 178 | |
cf778b00 ED |
179 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
180 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
181 | } |
182 | ||
e0c93948 | 183 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
184 | { |
185 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
186 | struct ip_tunnel *t = netdev_priv(dev); |
187 | ||
79134e6c | 188 | if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { |
fa857afc YH |
189 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); |
190 | t->ip6rd.relay_prefix = 0; | |
191 | t->ip6rd.prefixlen = 16; | |
192 | t->ip6rd.relay_prefixlen = 0; | |
193 | } else { | |
194 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
195 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
196 | } | |
197 | #endif | |
198 | } | |
199 | ||
f3723416 ND |
200 | static int ipip6_tunnel_create(struct net_device *dev) |
201 | { | |
202 | struct ip_tunnel *t = netdev_priv(dev); | |
203 | struct net *net = dev_net(dev); | |
204 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
205 | int err; | |
206 | ||
ebe084aa SK |
207 | memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); |
208 | memcpy(dev->broadcast, &t->parms.iph.daddr, 4); | |
f3723416 | 209 | |
d440b720 | 210 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
211 | dev->priv_flags |= IFF_ISATAP; |
212 | ||
87e57399 TLSC |
213 | dev->rtnl_link_ops = &sit_link_ops; |
214 | ||
f3723416 ND |
215 | err = register_netdevice(dev); |
216 | if (err < 0) | |
217 | goto out; | |
218 | ||
ebe084aa SK |
219 | ipip6_tunnel_clone_6rd(dev, sitn); |
220 | ||
f3723416 ND |
221 | ipip6_tunnel_link(sitn, t); |
222 | return 0; | |
223 | ||
224 | out: | |
225 | return err; | |
226 | } | |
227 | ||
3a43be3c | 228 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 229 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 230 | { |
e69a4adc AV |
231 | __be32 remote = parms->iph.daddr; |
232 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
233 | struct ip_tunnel *t, *nt; |
234 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 235 | struct net_device *dev; |
1da177e4 | 236 | char name[IFNAMSIZ]; |
ca8def14 | 237 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 238 | |
3a43be3c ED |
239 | for (tp = __ipip6_bucket(sitn, parms); |
240 | (t = rtnl_dereference(*tp)) != NULL; | |
241 | tp = &t->next) { | |
8db99e57 | 242 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
243 | remote == t->parms.iph.daddr && |
244 | parms->link == t->parms.link) { | |
8db99e57 SH |
245 | if (create) |
246 | return NULL; | |
247 | else | |
248 | return t; | |
249 | } | |
1da177e4 LT |
250 | } |
251 | if (!create) | |
252 | goto failed; | |
253 | ||
b95211e0 ED |
254 | if (parms->name[0]) { |
255 | if (!dev_valid_name(parms->name)) | |
256 | goto failed; | |
1da177e4 | 257 | strlcpy(name, parms->name, IFNAMSIZ); |
b95211e0 | 258 | } else { |
15fc1f70 | 259 | strcpy(name, "sit%d"); |
b95211e0 | 260 | } |
c835a677 TG |
261 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
262 | ipip6_tunnel_setup); | |
63159f29 | 263 | if (!dev) |
1da177e4 LT |
264 | return NULL; |
265 | ||
7a97146c PE |
266 | dev_net_set(dev, net); |
267 | ||
2941a486 | 268 | nt = netdev_priv(dev); |
1326c3d5 | 269 | |
1da177e4 | 270 | nt->parms = *parms; |
f3723416 | 271 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 272 | goto failed_free; |
1da177e4 | 273 | |
261ba78c | 274 | if (!parms->name[0]) |
275 | strcpy(parms->name, dev->name); | |
276 | ||
1da177e4 LT |
277 | return nt; |
278 | ||
b37d428b | 279 | failed_free: |
cf124db5 | 280 | free_netdev(dev); |
1da177e4 LT |
281 | failed: |
282 | return NULL; | |
283 | } | |
284 | ||
ef9a9d11 ED |
285 | #define for_each_prl_rcu(start) \ |
286 | for (prl = rcu_dereference(start); \ | |
287 | prl; \ | |
288 | prl = rcu_dereference(prl->next)) | |
289 | ||
fadf6bf0 | 290 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 291 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 292 | { |
ef9a9d11 | 293 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 294 | |
ef9a9d11 ED |
295 | for_each_prl_rcu(t->prl) |
296 | if (prl->addr == addr) | |
fadf6bf0 | 297 | break; |
ef9a9d11 | 298 | return prl; |
fadf6bf0 TF |
299 | |
300 | } | |
301 | ||
fd5d687b | 302 | static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr) |
300aaeea | 303 | { |
fd5d687b CH |
304 | struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data; |
305 | struct ip_tunnel *t = netdev_priv(dev); | |
2b4743bd | 306 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
307 | struct ip_tunnel_prl_entry *prl; |
308 | unsigned int cmax, c = 0, ca, len; | |
309 | int ret = 0; | |
310 | ||
fd5d687b CH |
311 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) |
312 | return -EINVAL; | |
313 | ||
2b4743bd YH |
314 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
315 | return -EFAULT; | |
316 | cmax = kprl.datalen / sizeof(kprl); | |
317 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
318 | cmax = 1; |
319 | ||
320 | /* For simple GET or for root users, | |
321 | * we try harder to allocate. | |
322 | */ | |
323 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
0ccc22f4 | 324 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
300aaeea YH |
325 | NULL; |
326 | ||
ef9a9d11 | 327 | rcu_read_lock(); |
300aaeea | 328 | |
284fda1e | 329 | ca = min(t->prl_count, cmax); |
300aaeea YH |
330 | |
331 | if (!kp) { | |
332 | /* We don't try hard to allocate much memory for | |
333 | * non-root users. | |
334 | * For root users, retry allocating enough memory for | |
335 | * the answer. | |
336 | */ | |
337 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
338 | if (!kp) { | |
339 | ret = -ENOMEM; | |
340 | goto out; | |
341 | } | |
342 | } | |
343 | ||
344 | c = 0; | |
ef9a9d11 | 345 | for_each_prl_rcu(t->prl) { |
298bf12d | 346 | if (c >= cmax) |
300aaeea | 347 | break; |
2b4743bd | 348 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
349 | continue; |
350 | kp[c].addr = prl->addr; | |
351 | kp[c].flags = prl->flags; | |
352 | c++; | |
2b4743bd | 353 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
354 | break; |
355 | } | |
356 | out: | |
ef9a9d11 | 357 | rcu_read_unlock(); |
300aaeea YH |
358 | |
359 | len = sizeof(*kp) * c; | |
2b4743bd YH |
360 | ret = 0; |
361 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
362 | ret = -EFAULT; | |
300aaeea YH |
363 | |
364 | kfree(kp); | |
300aaeea | 365 | |
2b4743bd | 366 | return ret; |
300aaeea YH |
367 | } |
368 | ||
fadf6bf0 TF |
369 | static int |
370 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
371 | { | |
372 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
373 | int err = 0; |
374 | ||
0009ae1f YH |
375 | if (a->addr == htonl(INADDR_ANY)) |
376 | return -EINVAL; | |
377 | ||
aac4dddc | 378 | ASSERT_RTNL(); |
fadf6bf0 | 379 | |
3a43be3c | 380 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 381 | if (p->addr == a->addr) { |
ef9a9d11 ED |
382 | if (chg) { |
383 | p->flags = a->flags; | |
384 | goto out; | |
385 | } | |
3fcfa129 YH |
386 | err = -EEXIST; |
387 | goto out; | |
fadf6bf0 TF |
388 | } |
389 | } | |
390 | ||
3fcfa129 YH |
391 | if (chg) { |
392 | err = -ENXIO; | |
393 | goto out; | |
394 | } | |
fadf6bf0 TF |
395 | |
396 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
397 | if (!p) { |
398 | err = -ENOBUFS; | |
399 | goto out; | |
400 | } | |
fadf6bf0 | 401 | |
fadf6bf0 | 402 | p->next = t->prl; |
300aaeea YH |
403 | p->addr = a->addr; |
404 | p->flags = a->flags; | |
ef9a9d11 | 405 | t->prl_count++; |
cf778b00 | 406 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 407 | out: |
3fcfa129 | 408 | return err; |
fadf6bf0 TF |
409 | } |
410 | ||
ef9a9d11 ED |
411 | static void prl_list_destroy_rcu(struct rcu_head *head) |
412 | { | |
413 | struct ip_tunnel_prl_entry *p, *n; | |
414 | ||
415 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
416 | do { | |
753ea8e9 | 417 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
418 | kfree(p); |
419 | p = n; | |
420 | } while (p); | |
421 | } | |
422 | ||
fadf6bf0 TF |
423 | static int |
424 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
425 | { | |
753ea8e9 ED |
426 | struct ip_tunnel_prl_entry *x; |
427 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
428 | int err = 0; |
429 | ||
aac4dddc | 430 | ASSERT_RTNL(); |
fadf6bf0 | 431 | |
0009ae1f | 432 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
433 | for (p = &t->prl; |
434 | (x = rtnl_dereference(*p)) != NULL; | |
435 | p = &x->next) { | |
436 | if (x->addr == a->addr) { | |
fadf6bf0 | 437 | *p = x->next; |
11c476f3 | 438 | kfree_rcu(x, rcu_head); |
300aaeea | 439 | t->prl_count--; |
3fcfa129 | 440 | goto out; |
fadf6bf0 TF |
441 | } |
442 | } | |
3fcfa129 | 443 | err = -ENXIO; |
fadf6bf0 | 444 | } else { |
753ea8e9 ED |
445 | x = rtnl_dereference(t->prl); |
446 | if (x) { | |
ef9a9d11 | 447 | t->prl_count = 0; |
ef9a9d11 ED |
448 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
449 | t->prl = NULL; | |
fadf6bf0 TF |
450 | } |
451 | } | |
3fcfa129 | 452 | out: |
4b279601 | 453 | return err; |
fadf6bf0 TF |
454 | } |
455 | ||
fd5d687b CH |
456 | static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, |
457 | int cmd) | |
458 | { | |
459 | struct ip_tunnel *t = netdev_priv(dev); | |
460 | struct ip_tunnel_prl prl; | |
461 | int err; | |
462 | ||
463 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) | |
464 | return -EPERM; | |
465 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) | |
466 | return -EINVAL; | |
467 | ||
468 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
469 | return -EFAULT; | |
470 | ||
471 | switch (cmd) { | |
472 | case SIOCDELPRL: | |
473 | err = ipip6_tunnel_del_prl(t, &prl); | |
474 | break; | |
475 | case SIOCADDPRL: | |
476 | case SIOCCHGPRL: | |
477 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
478 | break; | |
479 | } | |
480 | dst_cache_reset(&t->dst_cache); | |
481 | netdev_state_change(dev); | |
482 | return err; | |
483 | } | |
484 | ||
fadf6bf0 | 485 | static int |
b71d1d42 | 486 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 487 | { |
3fcfa129 | 488 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
489 | int ok = 1; |
490 | ||
ef9a9d11 | 491 | rcu_read_lock(); |
3fcfa129 | 492 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 493 | if (p) { |
300aaeea | 494 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
495 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
496 | else | |
497 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
498 | } else { | |
b71d1d42 ED |
499 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
500 | ||
fadf6bf0 TF |
501 | if (ipv6_addr_is_isatap(addr6) && |
502 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 503 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
504 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
505 | else | |
506 | ok = 0; | |
507 | } | |
ef9a9d11 | 508 | rcu_read_unlock(); |
fadf6bf0 TF |
509 | return ok; |
510 | } | |
511 | ||
1da177e4 LT |
512 | static void ipip6_tunnel_uninit(struct net_device *dev) |
513 | { | |
5e6700b3 ND |
514 | struct ip_tunnel *tunnel = netdev_priv(dev); |
515 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 516 | |
cd3dbc19 | 517 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 518 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 519 | } else { |
5e6700b3 ND |
520 | ipip6_tunnel_unlink(sitn, tunnel); |
521 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 522 | } |
e09acddf | 523 | dst_cache_reset(&tunnel->dst_cache); |
3a43be3c | 524 | dev_put(dev); |
1da177e4 LT |
525 | } |
526 | ||
c73cb5a2 | 527 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 528 | { |
b71d1d42 | 529 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
530 | const int type = icmp_hdr(skb)->type; |
531 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 532 | unsigned int data_len = 0; |
1da177e4 | 533 | struct ip_tunnel *t; |
3051fbec | 534 | int sifindex; |
c73cb5a2 | 535 | int err; |
1da177e4 LT |
536 | |
537 | switch (type) { | |
538 | default: | |
539 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 540 | return 0; |
1da177e4 LT |
541 | |
542 | case ICMP_DEST_UNREACH: | |
543 | switch (code) { | |
544 | case ICMP_SR_FAILED: | |
1da177e4 | 545 | /* Impossible event. */ |
c73cb5a2 | 546 | return 0; |
1da177e4 LT |
547 | default: |
548 | /* All others are translated to HOST_UNREACH. | |
549 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
550 | I believe they are just ether pollution. --ANK | |
551 | */ | |
552 | break; | |
553 | } | |
554 | break; | |
555 | case ICMP_TIME_EXCEEDED: | |
556 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 557 | return 0; |
20e1954f | 558 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 559 | break; |
ec18d9a2 DM |
560 | case ICMP_REDIRECT: |
561 | break; | |
1da177e4 LT |
562 | } |
563 | ||
c73cb5a2 KM |
564 | err = -ENOENT; |
565 | ||
3051fbec DA |
566 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
567 | t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
568 | iph->daddr, iph->saddr, sifindex); | |
63159f29 | 569 | if (!t) |
36393395 DM |
570 | goto out; |
571 | ||
572 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
573 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d888f396 | 574 | t->parms.link, iph->protocol); |
36393395 DM |
575 | err = 0; |
576 | goto out; | |
577 | } | |
ec18d9a2 | 578 | if (type == ICMP_REDIRECT) { |
1042caa7 MŻ |
579 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, |
580 | iph->protocol); | |
ec18d9a2 DM |
581 | err = 0; |
582 | goto out; | |
583 | } | |
36393395 | 584 | |
2d7a3b27 | 585 | err = 0; |
173656ac HL |
586 | if (__in6_dev_get(skb->dev) && |
587 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) | |
1da177e4 | 588 | goto out; |
c73cb5a2 | 589 | |
2d7a3b27 | 590 | if (t->parms.iph.daddr == 0) |
ca15a078 OG |
591 | goto out; |
592 | ||
1da177e4 LT |
593 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
594 | goto out; | |
595 | ||
bb80087a | 596 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
597 | t->err_count++; |
598 | else | |
599 | t->err_count = 1; | |
600 | t->err_time = jiffies; | |
601 | out: | |
c73cb5a2 | 602 | return err; |
1da177e4 LT |
603 | } |
604 | ||
218774dc HFS |
605 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
606 | const struct in6_addr *v6addr) | |
607 | { | |
608 | __be32 v4embed = 0; | |
609 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
610 | return true; | |
611 | return false; | |
612 | } | |
613 | ||
7df37ff3 CB |
614 | /* Checks if an address matches an address on the tunnel interface. |
615 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
616 | * Long story: | |
617 | * This function is called after we considered the packet as spoofed | |
618 | * in is_spoofed_6rd. | |
619 | * We may have a router that is doing NAT for proto 41 packets | |
620 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
621 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
622 | * function will return true, dropping the packet. | |
623 | * But, we can still check if is spoofed against the IP | |
624 | * addresses associated with the interface. | |
625 | */ | |
626 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
627 | const struct in6_addr *v6dst) | |
628 | { | |
629 | int prefix_len; | |
630 | ||
631 | #ifdef CONFIG_IPV6_SIT_6RD | |
632 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
633 | - tunnel->ip6rd.relay_prefixlen; | |
634 | #else | |
635 | prefix_len = 48; | |
636 | #endif | |
637 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
638 | } | |
639 | ||
640 | /* Returns true if a packet is spoofed */ | |
641 | static bool packet_is_spoofed(struct sk_buff *skb, | |
642 | const struct iphdr *iph, | |
643 | struct ip_tunnel *tunnel) | |
644 | { | |
645 | const struct ipv6hdr *ipv6h; | |
646 | ||
647 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
648 | if (!isatap_chksrc(skb, iph, tunnel)) | |
649 | return true; | |
650 | ||
651 | return false; | |
652 | } | |
653 | ||
654 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
655 | return false; | |
656 | ||
657 | ipv6h = ipv6_hdr(skb); | |
658 | ||
659 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
660 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
661 | &iph->saddr, &ipv6h->saddr, | |
662 | &iph->daddr, &ipv6h->daddr); | |
663 | return true; | |
664 | } | |
665 | ||
666 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
667 | return false; | |
668 | ||
669 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
670 | return false; | |
671 | ||
672 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
673 | &iph->saddr, &ipv6h->saddr, | |
674 | &iph->daddr, &ipv6h->daddr); | |
675 | return true; | |
676 | } | |
677 | ||
1da177e4 LT |
678 | static int ipip6_rcv(struct sk_buff *skb) |
679 | { | |
1ad759d8 | 680 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 681 | struct ip_tunnel *tunnel; |
3051fbec | 682 | int sifindex; |
f4e0b4c5 | 683 | int err; |
1da177e4 | 684 | |
3051fbec | 685 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
4fddbf5d | 686 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 687 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 688 | if (tunnel) { |
8f84985f | 689 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 690 | |
32b8a8e5 ND |
691 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
692 | tunnel->parms.iph.protocol != 0) | |
693 | goto out; | |
694 | ||
b0e380b1 | 695 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 696 | skb_reset_network_header(skb); |
8cdfab8a | 697 | IPCB(skb)->flags = 0; |
a09a4c8d | 698 | skb->dev = tunnel->dev; |
c7dc89c0 | 699 | |
7df37ff3 CB |
700 | if (packet_is_spoofed(skb, iph, tunnel)) { |
701 | tunnel->dev->stats.rx_errors++; | |
702 | goto out; | |
f4e0b4c5 ND |
703 | } |
704 | ||
a09a4c8d JG |
705 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
706 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
707 | goto out; | |
f4e0b4c5 | 708 | |
bb9bd814 LB |
709 | /* skb can be uncloned in iptunnel_pull_header, so |
710 | * old iph is no longer valid | |
711 | */ | |
712 | iph = (const struct iphdr *)skb_mac_header(skb); | |
730eed27 GN |
713 | skb_reset_mac_header(skb); |
714 | ||
f4e0b4c5 ND |
715 | err = IP_ECN_decapsulate(iph, skb); |
716 | if (unlikely(err)) { | |
717 | if (log_ecn_error) | |
718 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
719 | &iph->saddr, iph->tos); | |
720 | if (err > 1) { | |
721 | ++tunnel->dev->stats.rx_frame_errors; | |
722 | ++tunnel->dev->stats.rx_errors; | |
723 | goto out; | |
724 | } | |
c7dc89c0 | 725 | } |
d19d56dd | 726 | |
15fc1f70 | 727 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 728 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
729 | tstats->rx_packets++; |
730 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 731 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 732 | |
caf586e5 | 733 | netif_rx(skb); |
8990f468 | 734 | |
1da177e4 LT |
735 | return 0; |
736 | } | |
737 | ||
6dcdd1b3 | 738 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 739 | return 1; |
1da177e4 | 740 | out: |
36ca34cc | 741 | kfree_skb(skb); |
1da177e4 LT |
742 | return 0; |
743 | } | |
744 | ||
49dbe7ae | 745 | static const struct tnl_ptk_info ipip_tpi = { |
32b8a8e5 ND |
746 | /* no tunnel info required for ipip. */ |
747 | .proto = htons(ETH_P_IP), | |
748 | }; | |
749 | ||
49dbe7ae SH |
750 | #if IS_ENABLED(CONFIG_MPLS) |
751 | static const struct tnl_ptk_info mplsip_tpi = { | |
752 | /* no tunnel info required for mplsip. */ | |
753 | .proto = htons(ETH_P_MPLS_UC), | |
754 | }; | |
755 | #endif | |
756 | ||
757 | static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
32b8a8e5 | 758 | { |
3d7b46cd | 759 | const struct iphdr *iph; |
32b8a8e5 | 760 | struct ip_tunnel *tunnel; |
3051fbec DA |
761 | int sifindex; |
762 | ||
763 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; | |
32b8a8e5 | 764 | |
3d7b46cd | 765 | iph = ip_hdr(skb); |
32b8a8e5 | 766 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 767 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 768 | if (tunnel) { |
49dbe7ae SH |
769 | const struct tnl_ptk_info *tpi; |
770 | ||
771 | if (tunnel->parms.iph.protocol != ipproto && | |
32b8a8e5 ND |
772 | tunnel->parms.iph.protocol != 0) |
773 | goto drop; | |
774 | ||
775 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
776 | goto drop; | |
49dbe7ae SH |
777 | #if IS_ENABLED(CONFIG_MPLS) |
778 | if (ipproto == IPPROTO_MPLS) | |
779 | tpi = &mplsip_tpi; | |
780 | else | |
781 | #endif | |
782 | tpi = &ipip_tpi; | |
783 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 784 | goto drop; |
730eed27 GN |
785 | skb_reset_mac_header(skb); |
786 | ||
49dbe7ae | 787 | return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
32b8a8e5 ND |
788 | } |
789 | ||
790 | return 1; | |
791 | ||
792 | drop: | |
793 | kfree_skb(skb); | |
794 | return 0; | |
795 | } | |
796 | ||
49dbe7ae SH |
797 | static int ipip_rcv(struct sk_buff *skb) |
798 | { | |
799 | return sit_tunnel_rcv(skb, IPPROTO_IPIP); | |
800 | } | |
801 | ||
802 | #if IS_ENABLED(CONFIG_MPLS) | |
803 | static int mplsip_rcv(struct sk_buff *skb) | |
804 | { | |
805 | return sit_tunnel_rcv(skb, IPPROTO_MPLS); | |
806 | } | |
807 | #endif | |
808 | ||
fa857afc | 809 | /* |
218774dc HFS |
810 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
811 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 812 | */ |
218774dc HFS |
813 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
814 | __be32 *v4dst) | |
1da177e4 | 815 | { |
fa857afc YH |
816 | #ifdef CONFIG_IPV6_SIT_6RD |
817 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
818 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 819 | unsigned int pbw0, pbi0; |
fa857afc YH |
820 | int pbi1; |
821 | u32 d; | |
822 | ||
823 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
824 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
825 | ||
a843dc4e ML |
826 | d = tunnel->ip6rd.relay_prefixlen < 32 ? |
827 | (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
828 | tunnel->ip6rd.relay_prefixlen : 0; | |
fa857afc YH |
829 | |
830 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
831 | if (pbi1 > 0) | |
e7db38c3 | 832 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
833 | (32 - pbi1); |
834 | ||
218774dc HFS |
835 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
836 | return true; | |
fa857afc YH |
837 | } |
838 | #else | |
1da177e4 | 839 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 840 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
841 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
842 | return true; | |
1da177e4 | 843 | } |
fa857afc | 844 | #endif |
218774dc HFS |
845 | return false; |
846 | } | |
847 | ||
848 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
849 | const struct in6_addr *v6dst) | |
850 | { | |
851 | __be32 dst = 0; | |
852 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
853 | return dst; |
854 | } | |
855 | ||
856 | /* | |
857 | * This function assumes it is being called from dev_queue_xmit() | |
858 | * and that skb is filled properly by that function. | |
859 | */ | |
860 | ||
6fef4c0c SH |
861 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
862 | struct net_device *dev) | |
1da177e4 | 863 | { |
2941a486 | 864 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
865 | const struct iphdr *tiph = &tunnel->parms.iph; |
866 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 867 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 868 | __be16 df = tiph->frag_off; |
67ba4152 IM |
869 | struct rtable *rt; /* Route to the other host */ |
870 | struct net_device *tdev; /* Device to other host */ | |
871 | unsigned int max_headroom; /* The extra header space needed */ | |
e69a4adc | 872 | __be32 dst = tiph->daddr; |
31e4543d | 873 | struct flowi4 fl4; |
1da177e4 | 874 | int mtu; |
b71d1d42 | 875 | const struct in6_addr *addr6; |
1da177e4 | 876 | int addr_type; |
0e6fbc5b | 877 | u8 ttl; |
14909664 TH |
878 | u8 protocol = IPPROTO_IPV6; |
879 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1da177e4 | 880 | |
c2bceb3d LEM |
881 | if (tos == 1) |
882 | tos = ipv6_get_dsfield(iph6); | |
883 | ||
c7dc89c0 FT |
884 | /* ISATAP (RFC4214) - must come before 6to4 */ |
885 | if (dev->priv_flags & IFF_ISATAP) { | |
886 | struct neighbour *neigh = NULL; | |
1e2927b0 | 887 | bool do_tx_error = false; |
c7dc89c0 | 888 | |
adf30907 | 889 | if (skb_dst(skb)) |
1e2927b0 | 890 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 | 891 | |
63159f29 | 892 | if (!neigh) { |
7df37ff3 | 893 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
894 | goto tx_error; |
895 | } | |
896 | ||
3e866703 | 897 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
898 | addr_type = ipv6_addr_type(addr6); |
899 | ||
900 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
901 | ipv6_addr_is_isatap(addr6)) | |
902 | dst = addr6->s6_addr32[3]; | |
903 | else | |
1e2927b0 DM |
904 | do_tx_error = true; |
905 | ||
906 | neigh_release(neigh); | |
907 | if (do_tx_error) | |
c7dc89c0 FT |
908 | goto tx_error; |
909 | } | |
910 | ||
1da177e4 | 911 | if (!dst) |
218774dc | 912 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
913 | |
914 | if (!dst) { | |
915 | struct neighbour *neigh = NULL; | |
1e2927b0 | 916 | bool do_tx_error = false; |
1da177e4 | 917 | |
adf30907 | 918 | if (skb_dst(skb)) |
1e2927b0 | 919 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 | 920 | |
63159f29 | 921 | if (!neigh) { |
7df37ff3 | 922 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
923 | goto tx_error; |
924 | } | |
925 | ||
3e866703 | 926 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
927 | addr_type = ipv6_addr_type(addr6); |
928 | ||
929 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 930 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
931 | addr_type = ipv6_addr_type(addr6); |
932 | } | |
933 | ||
1e2927b0 DM |
934 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
935 | dst = addr6->s6_addr32[3]; | |
936 | else | |
937 | do_tx_error = true; | |
1da177e4 | 938 | |
1e2927b0 DM |
939 | neigh_release(neigh); |
940 | if (do_tx_error) | |
941 | goto tx_error; | |
1da177e4 LT |
942 | } |
943 | ||
9830ad4c CG |
944 | flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
945 | RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, | |
946 | 0, dst, tiph->saddr, 0, 0, | |
947 | sock_net_uid(tunnel->net, NULL)); | |
9830ad4c | 948 | |
6e3d1bbb HY |
949 | rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); |
950 | if (!rt) { | |
951 | rt = ip_route_output_flow(tunnel->net, &fl4, NULL); | |
952 | if (IS_ERR(rt)) { | |
953 | dev->stats.tx_carrier_errors++; | |
954 | goto tx_error_icmp; | |
955 | } | |
956 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); | |
1da177e4 | 957 | } |
6e3d1bbb | 958 | |
1da177e4 LT |
959 | if (rt->rt_type != RTN_UNICAST) { |
960 | ip_rt_put(rt); | |
15fc1f70 | 961 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
962 | goto tx_error_icmp; |
963 | } | |
d8d1f30b | 964 | tdev = rt->dst.dev; |
1da177e4 LT |
965 | |
966 | if (tdev == dev) { | |
967 | ip_rt_put(rt); | |
15fc1f70 | 968 | dev->stats.collisions++; |
1da177e4 LT |
969 | goto tx_error; |
970 | } | |
971 | ||
7e13318d | 972 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
14909664 | 973 | ip_rt_put(rt); |
aed069df | 974 | goto tx_error; |
14909664 TH |
975 | } |
976 | ||
292f4f3c | 977 | if (df) { |
14909664 | 978 | mtu = dst_mtu(&rt->dst) - t_hlen; |
1da177e4 | 979 | |
7f0e869c | 980 | if (mtu < IPV4_MIN_MTU) { |
15fc1f70 | 981 | dev->stats.collisions++; |
292f4f3c HX |
982 | ip_rt_put(rt); |
983 | goto tx_error; | |
984 | } | |
1da177e4 | 985 | |
292f4f3c HX |
986 | if (mtu < IPV6_MIN_MTU) { |
987 | mtu = IPV6_MIN_MTU; | |
988 | df = 0; | |
989 | } | |
990 | ||
f15ca723 | 991 | if (tunnel->parms.iph.daddr) |
4d42df46 | 992 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
292f4f3c | 993 | |
58a47824 | 994 | if (skb->len > mtu && !skb_is_gso(skb)) { |
4372339e | 995 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
996 | ip_rt_put(rt); |
997 | goto tx_error; | |
998 | } | |
1da177e4 LT |
999 | } |
1000 | ||
1001 | if (tunnel->err_count > 0) { | |
bb80087a WY |
1002 | if (time_before(jiffies, |
1003 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
1004 | tunnel->err_count--; |
1005 | dst_link_failure(skb); | |
1006 | } else | |
1007 | tunnel->err_count = 0; | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Okay, now see if we can stuff it in the buffer as-is. | |
1012 | */ | |
14909664 | 1013 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; |
1da177e4 | 1014 | |
cfbba49d PM |
1015 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1016 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
1017 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
1018 | if (!new_skb) { | |
1019 | ip_rt_put(rt); | |
15fc1f70 | 1020 | dev->stats.tx_dropped++; |
66028310 | 1021 | kfree_skb(skb); |
6ed10654 | 1022 | return NETDEV_TX_OK; |
1da177e4 LT |
1023 | } |
1024 | if (skb->sk) | |
1025 | skb_set_owner_w(new_skb, skb->sk); | |
1026 | dev_kfree_skb(skb); | |
1027 | skb = new_skb; | |
0660e03f | 1028 | iph6 = ipv6_hdr(skb); |
1da177e4 | 1029 | } |
0e6fbc5b PS |
1030 | ttl = tiph->ttl; |
1031 | if (ttl == 0) | |
1032 | ttl = iph6->hop_limit; | |
1033 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 1034 | |
14909664 | 1035 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
6a9eadcc | 1036 | ip_rt_put(rt); |
14909664 | 1037 | goto tx_error; |
6a9eadcc | 1038 | } |
3d483058 | 1039 | |
469471cd TH |
1040 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
1041 | ||
039f5062 PS |
1042 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
1043 | df, !net_eq(tunnel->net, dev_net(dev))); | |
6ed10654 | 1044 | return NETDEV_TX_OK; |
1da177e4 LT |
1045 | |
1046 | tx_error_icmp: | |
1047 | dst_link_failure(skb); | |
1048 | tx_error: | |
66028310 | 1049 | kfree_skb(skb); |
61c1db7f | 1050 | dev->stats.tx_errors++; |
6ed10654 | 1051 | return NETDEV_TX_OK; |
1da177e4 LT |
1052 | } |
1053 | ||
49dbe7ae SH |
1054 | static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
1055 | struct net_device *dev, u8 ipproto) | |
32b8a8e5 ND |
1056 | { |
1057 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1058 | const struct iphdr *tiph = &tunnel->parms.iph; | |
1059 | ||
7e13318d | 1060 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 1061 | goto tx_error; |
32b8a8e5 | 1062 | |
49dbe7ae | 1063 | skb_set_inner_ipproto(skb, ipproto); |
469471cd | 1064 | |
49dbe7ae | 1065 | ip_tunnel_xmit(skb, dev, tiph, ipproto); |
32b8a8e5 | 1066 | return NETDEV_TX_OK; |
aed069df AD |
1067 | tx_error: |
1068 | kfree_skb(skb); | |
61c1db7f ED |
1069 | dev->stats.tx_errors++; |
1070 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1071 | } |
1072 | ||
1073 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1074 | struct net_device *dev) | |
1075 | { | |
cb9f1b78 WB |
1076 | if (!pskb_inet_may_pull(skb)) |
1077 | goto tx_err; | |
1078 | ||
32b8a8e5 ND |
1079 | switch (skb->protocol) { |
1080 | case htons(ETH_P_IP): | |
49dbe7ae | 1081 | sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
32b8a8e5 ND |
1082 | break; |
1083 | case htons(ETH_P_IPV6): | |
1084 | ipip6_tunnel_xmit(skb, dev); | |
1085 | break; | |
49dbe7ae SH |
1086 | #if IS_ENABLED(CONFIG_MPLS) |
1087 | case htons(ETH_P_MPLS_UC): | |
1088 | sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); | |
1089 | break; | |
1090 | #endif | |
32b8a8e5 ND |
1091 | default: |
1092 | goto tx_err; | |
1093 | } | |
1094 | ||
1095 | return NETDEV_TX_OK; | |
1096 | ||
1097 | tx_err: | |
1098 | dev->stats.tx_errors++; | |
66028310 | 1099 | kfree_skb(skb); |
32b8a8e5 ND |
1100 | return NETDEV_TX_OK; |
1101 | ||
1102 | } | |
1103 | ||
8a4a50f9 MS |
1104 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1105 | { | |
1106 | struct net_device *tdev = NULL; | |
1107 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1108 | const struct iphdr *iph; |
31e4543d | 1109 | struct flowi4 fl4; |
8a4a50f9 MS |
1110 | |
1111 | tunnel = netdev_priv(dev); | |
1112 | iph = &tunnel->parms.iph; | |
1113 | ||
1114 | if (iph->daddr) { | |
5e6700b3 ND |
1115 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1116 | NULL, | |
78fbfd8a DM |
1117 | iph->daddr, iph->saddr, |
1118 | 0, 0, | |
1119 | IPPROTO_IPV6, | |
1120 | RT_TOS(iph->tos), | |
1121 | tunnel->parms.link); | |
b23dd4fe DM |
1122 | |
1123 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1124 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1125 | ip_rt_put(rt); |
1126 | } | |
1127 | dev->flags |= IFF_POINTOPOINT; | |
1128 | } | |
1129 | ||
1130 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1131 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 | 1132 | |
ff6ab32b | 1133 | if (tdev && !netif_is_l3_master(tdev)) { |
14909664 TH |
1134 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1135 | ||
14909664 | 1136 | dev->mtu = tdev->mtu - t_hlen; |
8a4a50f9 MS |
1137 | if (dev->mtu < IPV6_MIN_MTU) |
1138 | dev->mtu = IPV6_MIN_MTU; | |
1139 | } | |
8a4a50f9 MS |
1140 | } |
1141 | ||
9830ad4c CG |
1142 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
1143 | __u32 fwmark) | |
f3723416 | 1144 | { |
5e6700b3 | 1145 | struct net *net = t->net; |
f3723416 ND |
1146 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1147 | ||
1148 | ipip6_tunnel_unlink(sitn, t); | |
1149 | synchronize_net(); | |
1150 | t->parms.iph.saddr = p->iph.saddr; | |
1151 | t->parms.iph.daddr = p->iph.daddr; | |
1152 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1153 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1154 | ipip6_tunnel_link(sitn, t); | |
1155 | t->parms.iph.ttl = p->iph.ttl; | |
1156 | t->parms.iph.tos = p->iph.tos; | |
f859b4af | 1157 | t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c | 1158 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
f3723416 | 1159 | t->parms.link = p->link; |
9830ad4c | 1160 | t->fwmark = fwmark; |
f3723416 ND |
1161 | ipip6_tunnel_bind_dev(t->dev); |
1162 | } | |
e09acddf | 1163 | dst_cache_reset(&t->dst_cache); |
f3723416 ND |
1164 | netdev_state_change(t->dev); |
1165 | } | |
1166 | ||
e2f1f072 ND |
1167 | #ifdef CONFIG_IPV6_SIT_6RD |
1168 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1169 | struct ip_tunnel_6rd *ip6rd) | |
1170 | { | |
1171 | struct in6_addr prefix; | |
1172 | __be32 relay_prefix; | |
1173 | ||
1174 | if (ip6rd->relay_prefixlen > 32 || | |
1175 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1176 | return -EINVAL; | |
1177 | ||
1178 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1179 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1180 | return -EINVAL; | |
1181 | if (ip6rd->relay_prefixlen) | |
1182 | relay_prefix = ip6rd->relay_prefix & | |
1183 | htonl(0xffffffffUL << | |
1184 | (32 - ip6rd->relay_prefixlen)); | |
1185 | else | |
1186 | relay_prefix = 0; | |
1187 | if (relay_prefix != ip6rd->relay_prefix) | |
1188 | return -EINVAL; | |
1189 | ||
1190 | t->ip6rd.prefix = prefix; | |
1191 | t->ip6rd.relay_prefix = relay_prefix; | |
1192 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1193 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
e09acddf | 1194 | dst_cache_reset(&t->dst_cache); |
e2f1f072 ND |
1195 | netdev_state_change(t->dev); |
1196 | return 0; | |
1197 | } | |
fd5d687b CH |
1198 | |
1199 | static int | |
1200 | ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) | |
1201 | { | |
1202 | struct ip_tunnel *t = netdev_priv(dev); | |
1203 | struct ip_tunnel_6rd ip6rd; | |
1204 | struct ip_tunnel_parm p; | |
1205 | ||
1206 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { | |
1207 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1208 | return -EFAULT; | |
1209 | t = ipip6_tunnel_locate(t->net, &p, 0); | |
1210 | } | |
1211 | if (!t) | |
1212 | t = netdev_priv(dev); | |
1213 | ||
1214 | ip6rd.prefix = t->ip6rd.prefix; | |
1215 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
1216 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1217 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1218 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) | |
1219 | return -EFAULT; | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static int | |
1224 | ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1225 | { | |
1226 | struct ip_tunnel *t = netdev_priv(dev); | |
1227 | struct ip_tunnel_6rd ip6rd; | |
1228 | int err; | |
1229 | ||
1230 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) | |
1231 | return -EPERM; | |
1232 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd))) | |
1233 | return -EFAULT; | |
1234 | ||
1235 | if (cmd != SIOCDEL6RD) { | |
1236 | err = ipip6_tunnel_update_6rd(t, &ip6rd); | |
1237 | if (err < 0) | |
1238 | return err; | |
1239 | } else | |
1240 | ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | #endif /* CONFIG_IPV6_SIT_6RD */ | |
e2f1f072 | 1245 | |
03ff4979 | 1246 | static bool ipip6_valid_ip_proto(u8 ipproto) |
49dbe7ae SH |
1247 | { |
1248 | return ipproto == IPPROTO_IPV6 || | |
1249 | ipproto == IPPROTO_IPIP || | |
1250 | #if IS_ENABLED(CONFIG_MPLS) | |
1251 | ipproto == IPPROTO_MPLS || | |
1252 | #endif | |
1253 | ipproto == 0; | |
1254 | } | |
1255 | ||
1da177e4 | 1256 | static int |
fd5d687b | 1257 | __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) |
1da177e4 | 1258 | { |
fd5d687b CH |
1259 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1260 | return -EPERM; | |
1261 | ||
1262 | if (!ipip6_valid_ip_proto(p->iph.protocol)) | |
1263 | return -EINVAL; | |
1264 | if (p->iph.version != 4 || | |
1265 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) | |
1266 | return -EINVAL; | |
1267 | ||
1268 | if (p->iph.ttl) | |
1269 | p->iph.frag_off |= htons(IP_DF); | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | static int | |
f60fe2df | 1274 | ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1275 | { |
1276 | struct ip_tunnel *t = netdev_priv(dev); | |
fd5d687b | 1277 | |
f60fe2df CH |
1278 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) |
1279 | t = ipip6_tunnel_locate(t->net, p, 0); | |
fd5d687b CH |
1280 | if (!t) |
1281 | t = netdev_priv(dev); | |
f60fe2df | 1282 | memcpy(p, &t->parms, sizeof(*p)); |
fd5d687b CH |
1283 | return 0; |
1284 | } | |
1285 | ||
1286 | static int | |
f60fe2df | 1287 | ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b | 1288 | { |
9aad77c3 | 1289 | struct ip_tunnel *t = netdev_priv(dev); |
fd5d687b | 1290 | int err; |
1da177e4 | 1291 | |
f60fe2df | 1292 | err = __ipip6_tunnel_ioctl_validate(t->net, p); |
fd5d687b CH |
1293 | if (err) |
1294 | return err; | |
fa857afc | 1295 | |
f60fe2df | 1296 | t = ipip6_tunnel_locate(t->net, p, 1); |
fd5d687b CH |
1297 | if (!t) |
1298 | return -ENOBUFS; | |
fd5d687b CH |
1299 | return 0; |
1300 | } | |
1301 | ||
1302 | static int | |
f60fe2df | 1303 | ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1304 | { |
1305 | struct ip_tunnel *t = netdev_priv(dev); | |
fd5d687b CH |
1306 | int err; |
1307 | ||
f60fe2df | 1308 | err = __ipip6_tunnel_ioctl_validate(t->net, p); |
fd5d687b CH |
1309 | if (err) |
1310 | return err; | |
1311 | ||
f60fe2df | 1312 | t = ipip6_tunnel_locate(t->net, p, 0); |
fd5d687b CH |
1313 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { |
1314 | if (!t) | |
1315 | return -ENOENT; | |
1316 | } else { | |
1317 | if (t) { | |
1318 | if (t->dev != dev) | |
1319 | return -EEXIST; | |
fa857afc | 1320 | } else { |
f60fe2df CH |
1321 | if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || |
1322 | (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) | |
fd5d687b CH |
1323 | return -EINVAL; |
1324 | t = netdev_priv(dev); | |
fa857afc | 1325 | } |
1da177e4 | 1326 | |
f60fe2df | 1327 | ipip6_tunnel_update(t, p, t->fwmark); |
fd5d687b | 1328 | } |
1da177e4 | 1329 | |
fd5d687b CH |
1330 | return 0; |
1331 | } | |
f9cd5a55 | 1332 | |
fd5d687b | 1333 | static int |
f60fe2df | 1334 | ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1335 | { |
1336 | struct ip_tunnel *t = netdev_priv(dev); | |
1da177e4 | 1337 | |
fd5d687b CH |
1338 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) |
1339 | return -EPERM; | |
1da177e4 | 1340 | |
fd5d687b | 1341 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { |
f60fe2df | 1342 | t = ipip6_tunnel_locate(t->net, p, 0); |
fd5d687b CH |
1343 | if (!t) |
1344 | return -ENOENT; | |
1345 | if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) | |
1346 | return -EPERM; | |
1347 | dev = t->dev; | |
1348 | } | |
1349 | unregister_netdevice(dev); | |
1350 | return 0; | |
1351 | } | |
1da177e4 | 1352 | |
f60fe2df CH |
1353 | static int |
1354 | ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
1355 | { | |
1356 | switch (cmd) { | |
1357 | case SIOCGETTUNNEL: | |
1358 | return ipip6_tunnel_get(dev, p); | |
1359 | case SIOCADDTUNNEL: | |
1360 | return ipip6_tunnel_add(dev, p); | |
1361 | case SIOCCHGTUNNEL: | |
1362 | return ipip6_tunnel_change(dev, p); | |
1363 | case SIOCDELTUNNEL: | |
1364 | return ipip6_tunnel_del(dev, p); | |
1365 | default: | |
1366 | return -EINVAL; | |
1367 | } | |
1368 | } | |
1369 | ||
fd5d687b CH |
1370 | static int |
1371 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1372 | { | |
1373 | switch (cmd) { | |
1374 | case SIOCGETTUNNEL: | |
fd5d687b | 1375 | case SIOCADDTUNNEL: |
fd5d687b | 1376 | case SIOCCHGTUNNEL: |
fd5d687b | 1377 | case SIOCDELTUNNEL: |
f60fe2df | 1378 | return ip_tunnel_ioctl(dev, ifr, cmd); |
300aaeea | 1379 | case SIOCGETPRL: |
fd5d687b | 1380 | return ipip6_tunnel_get_prl(dev, ifr); |
fadf6bf0 TF |
1381 | case SIOCADDPRL: |
1382 | case SIOCDELPRL: | |
1383 | case SIOCCHGPRL: | |
fd5d687b | 1384 | return ipip6_tunnel_prl_ctl(dev, ifr, cmd); |
fa857afc | 1385 | #ifdef CONFIG_IPV6_SIT_6RD |
fd5d687b CH |
1386 | case SIOCGET6RD: |
1387 | return ipip6_tunnel_get6rd(dev, ifr); | |
fa857afc YH |
1388 | case SIOCADD6RD: |
1389 | case SIOCCHG6RD: | |
1390 | case SIOCDEL6RD: | |
fd5d687b | 1391 | return ipip6_tunnel_6rdctl(dev, ifr, cmd); |
fa857afc | 1392 | #endif |
1da177e4 | 1393 | default: |
fd5d687b | 1394 | return -EINVAL; |
1da177e4 | 1395 | } |
1da177e4 LT |
1396 | } |
1397 | ||
1326c3d5 | 1398 | static const struct net_device_ops ipip6_netdev_ops = { |
ebe084aa | 1399 | .ndo_init = ipip6_tunnel_init, |
1326c3d5 | 1400 | .ndo_uninit = ipip6_tunnel_uninit, |
32b8a8e5 | 1401 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 | 1402 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
98d7fc46 | 1403 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 1404 | .ndo_get_iflink = ip_tunnel_get_iflink, |
f60fe2df | 1405 | .ndo_tunnel_ctl = ipip6_tunnel_ctl, |
1326c3d5 SH |
1406 | }; |
1407 | ||
15fc1f70 ED |
1408 | static void ipip6_dev_free(struct net_device *dev) |
1409 | { | |
cf71d2bc ND |
1410 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1411 | ||
e09acddf | 1412 | dst_cache_destroy(&tunnel->dst_cache); |
15fc1f70 | 1413 | free_percpu(dev->tstats); |
15fc1f70 ED |
1414 | } |
1415 | ||
61c1db7f ED |
1416 | #define SIT_FEATURES (NETIF_F_SG | \ |
1417 | NETIF_F_FRAGLIST | \ | |
1418 | NETIF_F_HIGHDMA | \ | |
1419 | NETIF_F_GSO_SOFTWARE | \ | |
1420 | NETIF_F_HW_CSUM) | |
1421 | ||
1da177e4 LT |
1422 | static void ipip6_tunnel_setup(struct net_device *dev) |
1423 | { | |
14909664 TH |
1424 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1425 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1426 | ||
1326c3d5 | 1427 | dev->netdev_ops = &ipip6_netdev_ops; |
75ea1f47 | 1428 | dev->header_ops = &ip_tunnel_header_ops; |
cf124db5 DM |
1429 | dev->needs_free_netdev = true; |
1430 | dev->priv_destructor = ipip6_dev_free; | |
1da177e4 LT |
1431 | |
1432 | dev->type = ARPHRD_SIT; | |
14909664 | 1433 | dev->mtu = ETH_DATA_LEN - t_hlen; |
b96f9afe | 1434 | dev->min_mtu = IPV6_MIN_MTU; |
f7ff1fde | 1435 | dev->max_mtu = IP6_MAX_MTU - t_hlen; |
1da177e4 | 1436 | dev->flags = IFF_NOARP; |
02875878 | 1437 | netif_keep_dst(dev); |
1da177e4 | 1438 | dev->addr_len = 4; |
8df40d10 | 1439 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1440 | dev->features |= SIT_FEATURES; |
1441 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1442 | } |
1443 | ||
15fc1f70 | 1444 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1445 | { |
1326c3d5 | 1446 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e09acddf | 1447 | int err; |
1da177e4 LT |
1448 | |
1449 | tunnel->dev = dev; | |
5e6700b3 | 1450 | tunnel->net = dev_net(dev); |
ebe084aa | 1451 | strcpy(tunnel->parms.name, dev->name); |
1da177e4 | 1452 | |
8a4a50f9 | 1453 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1454 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1455 | if (!dev->tstats) |
1456 | return -ENOMEM; | |
1457 | ||
e09acddf PA |
1458 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1459 | if (err) { | |
cf71d2bc | 1460 | free_percpu(dev->tstats); |
d7426c69 | 1461 | dev->tstats = NULL; |
e09acddf | 1462 | return err; |
cf71d2bc | 1463 | } |
6289a98f | 1464 | dev_hold(dev); |
15fc1f70 | 1465 | return 0; |
1da177e4 LT |
1466 | } |
1467 | ||
4ece9009 | 1468 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1469 | { |
2941a486 | 1470 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1471 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1472 | struct net *net = dev_net(dev); |
1473 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 | 1474 | |
1da177e4 LT |
1475 | iph->version = 4; |
1476 | iph->protocol = IPPROTO_IPV6; | |
1477 | iph->ihl = 5; | |
1478 | iph->ttl = 64; | |
1479 | ||
cf778b00 | 1480 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
1da177e4 LT |
1481 | } |
1482 | ||
a8b8a889 MS |
1483 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
1484 | struct netlink_ext_ack *extack) | |
32b8a8e5 ND |
1485 | { |
1486 | u8 proto; | |
1487 | ||
c2ff682a | 1488 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1489 | return 0; |
1490 | ||
1491 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
49dbe7ae | 1492 | if (!ipip6_valid_ip_proto(proto)) |
32b8a8e5 ND |
1493 | return -EINVAL; |
1494 | ||
1495 | return 0; | |
1496 | } | |
1497 | ||
f3723416 | 1498 | static void ipip6_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
1499 | struct ip_tunnel_parm *parms, |
1500 | __u32 *fwmark) | |
f3723416 ND |
1501 | { |
1502 | memset(parms, 0, sizeof(*parms)); | |
1503 | ||
1504 | parms->iph.version = 4; | |
1505 | parms->iph.protocol = IPPROTO_IPV6; | |
1506 | parms->iph.ihl = 5; | |
1507 | parms->iph.ttl = 64; | |
1508 | ||
1509 | if (!data) | |
1510 | return; | |
1511 | ||
1512 | if (data[IFLA_IPTUN_LINK]) | |
1513 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1514 | ||
1515 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1516 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1517 | |
1518 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1519 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1520 | |
1521 | if (data[IFLA_IPTUN_TTL]) { | |
1522 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1523 | if (parms->iph.ttl) | |
1524 | parms->iph.frag_off = htons(IP_DF); | |
1525 | } | |
1526 | ||
1527 | if (data[IFLA_IPTUN_TOS]) | |
1528 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1529 | ||
1530 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1531 | parms->iph.frag_off = htons(IP_DF); | |
1532 | ||
1533 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1534 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1535 | |
1536 | if (data[IFLA_IPTUN_PROTO]) | |
1537 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1538 | ||
9830ad4c CG |
1539 | if (data[IFLA_IPTUN_FWMARK]) |
1540 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
f3723416 ND |
1541 | } |
1542 | ||
14909664 TH |
1543 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1544 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1545 | struct ip_tunnel_encap *ipencap) | |
1546 | { | |
1547 | bool ret = false; | |
1548 | ||
1549 | memset(ipencap, 0, sizeof(*ipencap)); | |
1550 | ||
1551 | if (!data) | |
1552 | return ret; | |
1553 | ||
1554 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1555 | ret = true; | |
1556 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1557 | } | |
1558 | ||
1559 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1560 | ret = true; | |
1561 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1562 | } | |
1563 | ||
1564 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1565 | ret = true; | |
a409caec | 1566 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
14909664 TH |
1567 | } |
1568 | ||
1569 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1570 | ret = true; | |
a409caec | 1571 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
14909664 TH |
1572 | } |
1573 | ||
1574 | return ret; | |
1575 | } | |
1576 | ||
e2f1f072 ND |
1577 | #ifdef CONFIG_IPV6_SIT_6RD |
1578 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1579 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1580 | struct ip_tunnel_6rd *ip6rd) | |
1581 | { | |
1582 | bool ret = false; | |
1583 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1584 | ||
1585 | if (!data) | |
1586 | return ret; | |
1587 | ||
1588 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1589 | ret = true; | |
67b61f6c | 1590 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
e2f1f072 ND |
1591 | } |
1592 | ||
1593 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1594 | ret = true; | |
1595 | ip6rd->relay_prefix = | |
1596 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1597 | } | |
1598 | ||
1599 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1600 | ret = true; | |
1601 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1602 | } | |
1603 | ||
1604 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1605 | ret = true; | |
1606 | ip6rd->relay_prefixlen = | |
1607 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1608 | } | |
1609 | ||
1610 | return ret; | |
1611 | } | |
1612 | #endif | |
1613 | ||
f3723416 | 1614 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1615 | struct nlattr *tb[], struct nlattr *data[], |
1616 | struct netlink_ext_ack *extack) | |
f3723416 ND |
1617 | { |
1618 | struct net *net = dev_net(dev); | |
1619 | struct ip_tunnel *nt; | |
14909664 | 1620 | struct ip_tunnel_encap ipencap; |
e2f1f072 ND |
1621 | #ifdef CONFIG_IPV6_SIT_6RD |
1622 | struct ip_tunnel_6rd ip6rd; | |
1623 | #endif | |
1624 | int err; | |
f3723416 ND |
1625 | |
1626 | nt = netdev_priv(dev); | |
14909664 TH |
1627 | |
1628 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1629 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1630 | if (err < 0) | |
1631 | return err; | |
1632 | } | |
1633 | ||
9830ad4c | 1634 | ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
f3723416 ND |
1635 | |
1636 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1637 | return -EEXIST; | |
1638 | ||
e2f1f072 ND |
1639 | err = ipip6_tunnel_create(dev); |
1640 | if (err < 0) | |
1641 | return err; | |
1642 | ||
2b3957c3 XL |
1643 | if (tb[IFLA_MTU]) { |
1644 | u32 mtu = nla_get_u32(tb[IFLA_MTU]); | |
1645 | ||
f7ff1fde ND |
1646 | if (mtu >= IPV6_MIN_MTU && |
1647 | mtu <= IP6_MAX_MTU - dev->hard_header_len) | |
2b3957c3 XL |
1648 | dev->mtu = mtu; |
1649 | } | |
1650 | ||
e2f1f072 | 1651 | #ifdef CONFIG_IPV6_SIT_6RD |
47e4bb14 | 1652 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) { |
e2f1f072 | 1653 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); |
47e4bb14 JK |
1654 | if (err < 0) |
1655 | unregister_netdevice_queue(dev, NULL); | |
1656 | } | |
e2f1f072 ND |
1657 | #endif |
1658 | ||
1659 | return err; | |
f3723416 ND |
1660 | } |
1661 | ||
1662 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
1663 | struct nlattr *data[], |
1664 | struct netlink_ext_ack *extack) | |
f3723416 | 1665 | { |
86bd68bf | 1666 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1667 | struct ip_tunnel_parm p; |
14909664 | 1668 | struct ip_tunnel_encap ipencap; |
86bd68bf | 1669 | struct net *net = t->net; |
f3723416 | 1670 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1671 | #ifdef CONFIG_IPV6_SIT_6RD |
1672 | struct ip_tunnel_6rd ip6rd; | |
1673 | #endif | |
9830ad4c | 1674 | __u32 fwmark = t->fwmark; |
14909664 | 1675 | int err; |
f3723416 ND |
1676 | |
1677 | if (dev == sitn->fb_tunnel_dev) | |
1678 | return -EINVAL; | |
1679 | ||
14909664 TH |
1680 | if (ipip6_netlink_encap_parms(data, &ipencap)) { |
1681 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1682 | if (err < 0) | |
1683 | return err; | |
1684 | } | |
1685 | ||
9830ad4c | 1686 | ipip6_netlink_parms(data, &p, &fwmark); |
f3723416 ND |
1687 | |
1688 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1689 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1690 | return -EINVAL; | |
1691 | ||
1692 | t = ipip6_tunnel_locate(net, &p, 0); | |
1693 | ||
1694 | if (t) { | |
1695 | if (t->dev != dev) | |
1696 | return -EEXIST; | |
1697 | } else | |
1698 | t = netdev_priv(dev); | |
1699 | ||
9830ad4c | 1700 | ipip6_tunnel_update(t, &p, fwmark); |
e2f1f072 ND |
1701 | |
1702 | #ifdef CONFIG_IPV6_SIT_6RD | |
1703 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1704 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1705 | #endif | |
1706 | ||
f3723416 ND |
1707 | return 0; |
1708 | } | |
1709 | ||
e4c94a9c | 1710 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1711 | { |
1712 | return | |
1713 | /* IFLA_IPTUN_LINK */ | |
1714 | nla_total_size(4) + | |
1715 | /* IFLA_IPTUN_LOCAL */ | |
1716 | nla_total_size(4) + | |
1717 | /* IFLA_IPTUN_REMOTE */ | |
1718 | nla_total_size(4) + | |
1719 | /* IFLA_IPTUN_TTL */ | |
1720 | nla_total_size(1) + | |
1721 | /* IFLA_IPTUN_TOS */ | |
1722 | nla_total_size(1) + | |
a12c9a85 ND |
1723 | /* IFLA_IPTUN_PMTUDISC */ |
1724 | nla_total_size(1) + | |
1725 | /* IFLA_IPTUN_FLAGS */ | |
1726 | nla_total_size(2) + | |
32b8a8e5 ND |
1727 | /* IFLA_IPTUN_PROTO */ |
1728 | nla_total_size(1) + | |
e2f1f072 ND |
1729 | #ifdef CONFIG_IPV6_SIT_6RD |
1730 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1731 | nla_total_size(sizeof(struct in6_addr)) + | |
1732 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1733 | nla_total_size(4) + | |
1734 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1735 | nla_total_size(2) + | |
1736 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1737 | nla_total_size(2) + | |
1738 | #endif | |
14909664 TH |
1739 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1740 | nla_total_size(2) + | |
1741 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1742 | nla_total_size(2) + | |
1743 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1744 | nla_total_size(2) + | |
1745 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1746 | nla_total_size(2) + | |
9830ad4c CG |
1747 | /* IFLA_IPTUN_FWMARK */ |
1748 | nla_total_size(4) + | |
ba3e3f50 ND |
1749 | 0; |
1750 | } | |
1751 | ||
e4c94a9c | 1752 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1753 | { |
1754 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1755 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1756 | ||
1757 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1758 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
1759 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
ba3e3f50 | 1760 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
a12c9a85 ND |
1761 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1762 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1763 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1764 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
9830ad4c CG |
1765 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
1766 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
ba3e3f50 | 1767 | goto nla_put_failure; |
e2f1f072 ND |
1768 | |
1769 | #ifdef CONFIG_IPV6_SIT_6RD | |
930345ea JB |
1770 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
1771 | &tunnel->ip6rd.prefix) || | |
1772 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1773 | tunnel->ip6rd.relay_prefix) || | |
e2f1f072 ND |
1774 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
1775 | tunnel->ip6rd.prefixlen) || | |
1776 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1777 | tunnel->ip6rd.relay_prefixlen)) | |
1778 | goto nla_put_failure; | |
1779 | #endif | |
1780 | ||
14909664 TH |
1781 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
1782 | tunnel->encap.type) || | |
a409caec | 1783 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
14909664 | 1784 | tunnel->encap.sport) || |
a409caec | 1785 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
14909664 TH |
1786 | tunnel->encap.dport) || |
1787 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
e1b2cb65 | 1788 | tunnel->encap.flags)) |
14909664 TH |
1789 | goto nla_put_failure; |
1790 | ||
ba3e3f50 ND |
1791 | return 0; |
1792 | ||
1793 | nla_put_failure: | |
1794 | return -EMSGSIZE; | |
1795 | } | |
1796 | ||
f3723416 ND |
1797 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1798 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1799 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1800 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1801 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1802 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1803 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1804 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1805 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1806 | #ifdef CONFIG_IPV6_SIT_6RD |
1807 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1808 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1809 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1810 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1811 | #endif | |
14909664 TH |
1812 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1813 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1814 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1815 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
9830ad4c | 1816 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
f3723416 ND |
1817 | }; |
1818 | ||
9434266f WB |
1819 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1820 | { | |
1821 | struct net *net = dev_net(dev); | |
1822 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1823 | ||
1824 | if (dev != sitn->fb_tunnel_dev) | |
1825 | unregister_netdevice_queue(dev, head); | |
1826 | } | |
1827 | ||
ba3e3f50 ND |
1828 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1829 | .kind = "sit", | |
1830 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1831 | .policy = ipip6_policy, |
ba3e3f50 | 1832 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1833 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1834 | .validate = ipip6_validate, |
f3723416 ND |
1835 | .newlink = ipip6_newlink, |
1836 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1837 | .get_size = ipip6_get_size, |
1838 | .fill_info = ipip6_fill_info, | |
9434266f | 1839 | .dellink = ipip6_dellink, |
1728d4fa | 1840 | .get_link_net = ip_tunnel_get_link_net, |
ba3e3f50 ND |
1841 | }; |
1842 | ||
6dcd814b | 1843 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1844 | .handler = ipip6_rcv, |
1845 | .err_handler = ipip6_err, | |
c73cb5a2 | 1846 | .priority = 1, |
1da177e4 LT |
1847 | }; |
1848 | ||
32b8a8e5 ND |
1849 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1850 | .handler = ipip_rcv, | |
1851 | .err_handler = ipip6_err, | |
1852 | .priority = 2, | |
1853 | }; | |
1854 | ||
49dbe7ae SH |
1855 | #if IS_ENABLED(CONFIG_MPLS) |
1856 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
1857 | .handler = mplsip_rcv, | |
1858 | .err_handler = ipip6_err, | |
1859 | .priority = 2, | |
1860 | }; | |
1861 | #endif | |
1862 | ||
9434266f WB |
1863 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1864 | struct list_head *head) | |
db44575f | 1865 | { |
9434266f | 1866 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1867 | struct net_device *dev, *aux; |
db44575f AK |
1868 | int prio; |
1869 | ||
5e6700b3 ND |
1870 | for_each_netdev_safe(net, dev, aux) |
1871 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1872 | unregister_netdevice_queue(dev, head); | |
1873 | ||
610f8c0f | 1874 | for (prio = 0; prio < 4; prio++) { |
db44575f | 1875 | int h; |
610f8c0f | 1876 | for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { |
753ea8e9 | 1877 | struct ip_tunnel *t; |
62808f91 | 1878 | |
753ea8e9 | 1879 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
53b24b8f | 1880 | while (t) { |
5e6700b3 ND |
1881 | /* If dev is in the same netns, it has already |
1882 | * been added to the list by the previous loop. | |
1883 | */ | |
fc8f999d | 1884 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1885 | unregister_netdevice_queue(t->dev, |
1886 | head); | |
753ea8e9 | 1887 | t = rtnl_dereference(t->next); |
62808f91 | 1888 | } |
db44575f AK |
1889 | } |
1890 | } | |
1891 | } | |
1892 | ||
2c8c1e72 | 1893 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1894 | { |
67101172 | 1895 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1896 | struct ip_tunnel *t; |
8190d900 | 1897 | int err; |
8190d900 | 1898 | |
29182176 PE |
1899 | sitn->tunnels[0] = sitn->tunnels_wc; |
1900 | sitn->tunnels[1] = sitn->tunnels_l; | |
1901 | sitn->tunnels[2] = sitn->tunnels_r; | |
1902 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1903 | ||
79134e6c ED |
1904 | if (!net_has_fallback_tunnels(net)) |
1905 | return 0; | |
1906 | ||
cd3dbc19 | 1907 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1908 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1909 | ipip6_tunnel_setup); |
1910 | if (!sitn->fb_tunnel_dev) { | |
1911 | err = -ENOMEM; | |
1912 | goto err_alloc_dev; | |
1913 | } | |
be77e593 | 1914 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1915 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1916 | /* FB netdevice is special: we have one, and only one per netns. |
1917 | * Allowing to move it to another netns is clearly unsafe. | |
1918 | */ | |
1919 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1920 | |
e5d08d71 IM |
1921 | err = register_netdev(sitn->fb_tunnel_dev); |
1922 | if (err) | |
cd3dbc19 PE |
1923 | goto err_reg_dev; |
1924 | ||
4ece9009 ED |
1925 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
1926 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1927 | ||
72b36015 TF |
1928 | t = netdev_priv(sitn->fb_tunnel_dev); |
1929 | ||
1930 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1931 | return 0; |
1932 | ||
cd3dbc19 | 1933 | err_reg_dev: |
dd4080ee | 1934 | ipip6_dev_free(sitn->fb_tunnel_dev); |
07f12b26 | 1935 | free_netdev(sitn->fb_tunnel_dev); |
cd3dbc19 | 1936 | err_alloc_dev: |
8190d900 PE |
1937 | return err; |
1938 | } | |
1939 | ||
bb401cae | 1940 | static void __net_exit sit_exit_batch_net(struct list_head *net_list) |
8190d900 | 1941 | { |
62808f91 | 1942 | LIST_HEAD(list); |
bb401cae | 1943 | struct net *net; |
8190d900 | 1944 | |
cd3dbc19 | 1945 | rtnl_lock(); |
bb401cae ED |
1946 | list_for_each_entry(net, net_list, exit_list) |
1947 | sit_destroy_tunnels(net, &list); | |
1948 | ||
62808f91 | 1949 | unregister_netdevice_many(&list); |
cd3dbc19 | 1950 | rtnl_unlock(); |
8190d900 PE |
1951 | } |
1952 | ||
1953 | static struct pernet_operations sit_net_ops = { | |
1954 | .init = sit_init_net, | |
bb401cae | 1955 | .exit_batch = sit_exit_batch_net, |
67101172 EB |
1956 | .id = &sit_net_id, |
1957 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1958 | }; |
1959 | ||
89c89458 | 1960 | static void __exit sit_cleanup(void) |
1da177e4 | 1961 | { |
ba3e3f50 | 1962 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1963 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1964 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
49dbe7ae SH |
1965 | #if IS_ENABLED(CONFIG_MPLS) |
1966 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1967 | #endif | |
db44575f | 1968 | |
67101172 | 1969 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1970 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1971 | } |
1972 | ||
89c89458 | 1973 | static int __init sit_init(void) |
1da177e4 LT |
1974 | { |
1975 | int err; | |
1976 | ||
49dbe7ae | 1977 | pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 1978 | |
67101172 | 1979 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1980 | if (err < 0) |
d5aa407f AD |
1981 | return err; |
1982 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1983 | if (err < 0) { | |
32b8a8e5 | 1984 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1985 | goto xfrm_tunnel_failed; |
d5aa407f | 1986 | } |
32b8a8e5 ND |
1987 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1988 | if (err < 0) { | |
1989 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1990 | goto xfrm_tunnel4_failed; | |
1991 | } | |
49dbe7ae SH |
1992 | #if IS_ENABLED(CONFIG_MPLS) |
1993 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
1994 | if (err < 0) { | |
1995 | pr_info("%s: can't register mplsip\n", __func__); | |
1996 | goto xfrm_tunnel_mpls_failed; | |
1997 | } | |
1998 | #endif | |
ba3e3f50 ND |
1999 | err = rtnl_link_register(&sit_link_ops); |
2000 | if (err < 0) | |
2001 | goto rtnl_link_failed; | |
2002 | ||
2003 | out: | |
1da177e4 | 2004 | return err; |
ba3e3f50 ND |
2005 | |
2006 | rtnl_link_failed: | |
49dbe7ae SH |
2007 | #if IS_ENABLED(CONFIG_MPLS) |
2008 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
2009 | xfrm_tunnel_mpls_failed: | |
2010 | #endif | |
32b8a8e5 ND |
2011 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
2012 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
2013 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
2014 | xfrm_tunnel_failed: | |
2015 | unregister_pernet_device(&sit_net_ops); | |
2016 | goto out; | |
1da177e4 | 2017 | } |
989e5b96 JR |
2018 | |
2019 | module_init(sit_init); | |
2020 | module_exit(sit_cleanup); | |
39c85086 | 2021 | MODULE_LICENSE("GPL"); |
f98f89a0 | 2022 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 2023 | MODULE_ALIAS_NETDEV("sit0"); |