Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
18 | */ |
19 | ||
f3213831 JP |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
1da177e4 LT |
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 | ||
e87a8f24 | 65 | #define IP6_SIT_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 | |
c7d03a00 | 79 | static unsigned int sit_net_id __read_mostly; |
8190d900 | 80 | struct sit_net { |
e87a8f24 JK |
81 | struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; |
82 | struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; | |
83 | struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; | |
3a43be3c ED |
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]); |
53b24b8f | 121 | if (t && (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 | ||
c3d7d3a0 | 179 | if (dev == sitn->fb_tunnel_dev) { |
fa857afc YH |
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 | ||
ebe084aa SK |
198 | memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); |
199 | memcpy(dev->broadcast, &t->parms.iph.daddr, 4); | |
f3723416 | 200 | |
d440b720 | 201 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
202 | dev->priv_flags |= IFF_ISATAP; |
203 | ||
87e57399 TLSC |
204 | dev->rtnl_link_ops = &sit_link_ops; |
205 | ||
f3723416 ND |
206 | err = register_netdevice(dev); |
207 | if (err < 0) | |
208 | goto out; | |
209 | ||
ebe084aa SK |
210 | ipip6_tunnel_clone_6rd(dev, sitn); |
211 | ||
f3723416 ND |
212 | dev_hold(dev); |
213 | ||
214 | ipip6_tunnel_link(sitn, t); | |
215 | return 0; | |
216 | ||
217 | out: | |
218 | return err; | |
219 | } | |
220 | ||
3a43be3c | 221 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 222 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 223 | { |
e69a4adc AV |
224 | __be32 remote = parms->iph.daddr; |
225 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
226 | struct ip_tunnel *t, *nt; |
227 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 228 | struct net_device *dev; |
1da177e4 | 229 | char name[IFNAMSIZ]; |
ca8def14 | 230 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 231 | |
3a43be3c ED |
232 | for (tp = __ipip6_bucket(sitn, parms); |
233 | (t = rtnl_dereference(*tp)) != NULL; | |
234 | tp = &t->next) { | |
8db99e57 | 235 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
236 | remote == t->parms.iph.daddr && |
237 | parms->link == t->parms.link) { | |
8db99e57 SH |
238 | if (create) |
239 | return NULL; | |
240 | else | |
241 | return t; | |
242 | } | |
1da177e4 LT |
243 | } |
244 | if (!create) | |
245 | goto failed; | |
246 | ||
a7309cad ED |
247 | if (parms->name[0]) { |
248 | if (!dev_valid_name(parms->name)) | |
249 | goto failed; | |
1da177e4 | 250 | strlcpy(name, parms->name, IFNAMSIZ); |
a7309cad | 251 | } else { |
15fc1f70 | 252 | strcpy(name, "sit%d"); |
a7309cad | 253 | } |
c835a677 TG |
254 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
255 | ipip6_tunnel_setup); | |
63159f29 | 256 | if (!dev) |
1da177e4 LT |
257 | return NULL; |
258 | ||
7a97146c PE |
259 | dev_net_set(dev, net); |
260 | ||
2941a486 | 261 | nt = netdev_priv(dev); |
1326c3d5 | 262 | |
1da177e4 | 263 | nt->parms = *parms; |
f3723416 | 264 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 265 | goto failed_free; |
1da177e4 | 266 | |
1da177e4 LT |
267 | return nt; |
268 | ||
b37d428b | 269 | failed_free: |
cf124db5 | 270 | free_netdev(dev); |
1da177e4 LT |
271 | failed: |
272 | return NULL; | |
273 | } | |
274 | ||
ef9a9d11 ED |
275 | #define for_each_prl_rcu(start) \ |
276 | for (prl = rcu_dereference(start); \ | |
277 | prl; \ | |
278 | prl = rcu_dereference(prl->next)) | |
279 | ||
fadf6bf0 | 280 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 281 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 282 | { |
ef9a9d11 | 283 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 284 | |
ef9a9d11 ED |
285 | for_each_prl_rcu(t->prl) |
286 | if (prl->addr == addr) | |
fadf6bf0 | 287 | break; |
ef9a9d11 | 288 | return prl; |
fadf6bf0 TF |
289 | |
290 | } | |
291 | ||
2b4743bd YH |
292 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
293 | struct ip_tunnel_prl __user *a) | |
300aaeea | 294 | { |
2b4743bd | 295 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
296 | struct ip_tunnel_prl_entry *prl; |
297 | unsigned int cmax, c = 0, ca, len; | |
298 | int ret = 0; | |
299 | ||
2b4743bd YH |
300 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
301 | return -EFAULT; | |
302 | cmax = kprl.datalen / sizeof(kprl); | |
303 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
304 | cmax = 1; |
305 | ||
306 | /* For simple GET or for root users, | |
307 | * we try harder to allocate. | |
308 | */ | |
309 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
0ccc22f4 | 310 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
300aaeea YH |
311 | NULL; |
312 | ||
ef9a9d11 | 313 | rcu_read_lock(); |
300aaeea YH |
314 | |
315 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
316 | ||
317 | if (!kp) { | |
318 | /* We don't try hard to allocate much memory for | |
319 | * non-root users. | |
320 | * For root users, retry allocating enough memory for | |
321 | * the answer. | |
322 | */ | |
323 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
324 | if (!kp) { | |
325 | ret = -ENOMEM; | |
326 | goto out; | |
327 | } | |
328 | } | |
329 | ||
330 | c = 0; | |
ef9a9d11 | 331 | for_each_prl_rcu(t->prl) { |
298bf12d | 332 | if (c >= cmax) |
300aaeea | 333 | break; |
2b4743bd | 334 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
335 | continue; |
336 | kp[c].addr = prl->addr; | |
337 | kp[c].flags = prl->flags; | |
338 | c++; | |
2b4743bd | 339 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
340 | break; |
341 | } | |
342 | out: | |
ef9a9d11 | 343 | rcu_read_unlock(); |
300aaeea YH |
344 | |
345 | len = sizeof(*kp) * c; | |
2b4743bd YH |
346 | ret = 0; |
347 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
348 | ret = -EFAULT; | |
300aaeea YH |
349 | |
350 | kfree(kp); | |
300aaeea | 351 | |
2b4743bd | 352 | return ret; |
300aaeea YH |
353 | } |
354 | ||
fadf6bf0 TF |
355 | static int |
356 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
357 | { | |
358 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
359 | int err = 0; |
360 | ||
0009ae1f YH |
361 | if (a->addr == htonl(INADDR_ANY)) |
362 | return -EINVAL; | |
363 | ||
aac4dddc | 364 | ASSERT_RTNL(); |
fadf6bf0 | 365 | |
3a43be3c | 366 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 367 | if (p->addr == a->addr) { |
ef9a9d11 ED |
368 | if (chg) { |
369 | p->flags = a->flags; | |
370 | goto out; | |
371 | } | |
3fcfa129 YH |
372 | err = -EEXIST; |
373 | goto out; | |
fadf6bf0 TF |
374 | } |
375 | } | |
376 | ||
3fcfa129 YH |
377 | if (chg) { |
378 | err = -ENXIO; | |
379 | goto out; | |
380 | } | |
fadf6bf0 TF |
381 | |
382 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
383 | if (!p) { |
384 | err = -ENOBUFS; | |
385 | goto out; | |
386 | } | |
fadf6bf0 | 387 | |
fadf6bf0 | 388 | p->next = t->prl; |
300aaeea YH |
389 | p->addr = a->addr; |
390 | p->flags = a->flags; | |
ef9a9d11 | 391 | t->prl_count++; |
cf778b00 | 392 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 393 | out: |
3fcfa129 | 394 | return err; |
fadf6bf0 TF |
395 | } |
396 | ||
ef9a9d11 ED |
397 | static void prl_list_destroy_rcu(struct rcu_head *head) |
398 | { | |
399 | struct ip_tunnel_prl_entry *p, *n; | |
400 | ||
401 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
402 | do { | |
753ea8e9 | 403 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
404 | kfree(p); |
405 | p = n; | |
406 | } while (p); | |
407 | } | |
408 | ||
fadf6bf0 TF |
409 | static int |
410 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
411 | { | |
753ea8e9 ED |
412 | struct ip_tunnel_prl_entry *x; |
413 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
414 | int err = 0; |
415 | ||
aac4dddc | 416 | ASSERT_RTNL(); |
fadf6bf0 | 417 | |
0009ae1f | 418 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
419 | for (p = &t->prl; |
420 | (x = rtnl_dereference(*p)) != NULL; | |
421 | p = &x->next) { | |
422 | if (x->addr == a->addr) { | |
fadf6bf0 | 423 | *p = x->next; |
11c476f3 | 424 | kfree_rcu(x, rcu_head); |
300aaeea | 425 | t->prl_count--; |
3fcfa129 | 426 | goto out; |
fadf6bf0 TF |
427 | } |
428 | } | |
3fcfa129 | 429 | err = -ENXIO; |
fadf6bf0 | 430 | } else { |
753ea8e9 ED |
431 | x = rtnl_dereference(t->prl); |
432 | if (x) { | |
ef9a9d11 | 433 | t->prl_count = 0; |
ef9a9d11 ED |
434 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
435 | t->prl = NULL; | |
fadf6bf0 TF |
436 | } |
437 | } | |
3fcfa129 | 438 | out: |
4b279601 | 439 | return err; |
fadf6bf0 TF |
440 | } |
441 | ||
fadf6bf0 | 442 | static int |
b71d1d42 | 443 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 444 | { |
3fcfa129 | 445 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
446 | int ok = 1; |
447 | ||
ef9a9d11 | 448 | rcu_read_lock(); |
3fcfa129 | 449 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 450 | if (p) { |
300aaeea | 451 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
452 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
453 | else | |
454 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
455 | } else { | |
b71d1d42 ED |
456 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
457 | ||
fadf6bf0 TF |
458 | if (ipv6_addr_is_isatap(addr6) && |
459 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 460 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
461 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
462 | else | |
463 | ok = 0; | |
464 | } | |
ef9a9d11 | 465 | rcu_read_unlock(); |
fadf6bf0 TF |
466 | return ok; |
467 | } | |
468 | ||
1da177e4 LT |
469 | static void ipip6_tunnel_uninit(struct net_device *dev) |
470 | { | |
5e6700b3 ND |
471 | struct ip_tunnel *tunnel = netdev_priv(dev); |
472 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 473 | |
cd3dbc19 | 474 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 475 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 476 | } else { |
5e6700b3 ND |
477 | ipip6_tunnel_unlink(sitn, tunnel); |
478 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 479 | } |
e09acddf | 480 | dst_cache_reset(&tunnel->dst_cache); |
3a43be3c | 481 | dev_put(dev); |
1da177e4 LT |
482 | } |
483 | ||
c73cb5a2 | 484 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 485 | { |
b71d1d42 | 486 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
487 | const int type = icmp_hdr(skb)->type; |
488 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 489 | unsigned int data_len = 0; |
1da177e4 | 490 | struct ip_tunnel *t; |
c73cb5a2 | 491 | int err; |
1da177e4 LT |
492 | |
493 | switch (type) { | |
494 | default: | |
495 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 496 | return 0; |
1da177e4 LT |
497 | |
498 | case ICMP_DEST_UNREACH: | |
499 | switch (code) { | |
500 | case ICMP_SR_FAILED: | |
1da177e4 | 501 | /* Impossible event. */ |
c73cb5a2 | 502 | return 0; |
1da177e4 LT |
503 | default: |
504 | /* All others are translated to HOST_UNREACH. | |
505 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
506 | I believe they are just ether pollution. --ANK | |
507 | */ | |
508 | break; | |
509 | } | |
510 | break; | |
511 | case ICMP_TIME_EXCEEDED: | |
512 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 513 | return 0; |
20e1954f | 514 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 515 | break; |
ec18d9a2 DM |
516 | case ICMP_REDIRECT: |
517 | break; | |
1da177e4 LT |
518 | } |
519 | ||
c73cb5a2 KM |
520 | err = -ENOENT; |
521 | ||
4fddbf5d SH |
522 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
523 | skb->dev, | |
524 | iph->daddr, | |
525 | iph->saddr); | |
63159f29 | 526 | if (!t) |
36393395 DM |
527 | goto out; |
528 | ||
529 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
530 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d5d8760b | 531 | t->parms.link, 0, iph->protocol, 0); |
36393395 DM |
532 | err = 0; |
533 | goto out; | |
534 | } | |
ec18d9a2 | 535 | if (type == ICMP_REDIRECT) { |
2346829e | 536 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, |
d5d8760b | 537 | iph->protocol, 0); |
ec18d9a2 DM |
538 | err = 0; |
539 | goto out; | |
540 | } | |
36393395 | 541 | |
2d7a3b27 | 542 | err = 0; |
20e1954f | 543 | if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) |
1da177e4 | 544 | goto out; |
c73cb5a2 | 545 | |
2d7a3b27 | 546 | if (t->parms.iph.daddr == 0) |
ca15a078 OG |
547 | goto out; |
548 | ||
1da177e4 LT |
549 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
550 | goto out; | |
551 | ||
bb80087a | 552 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
553 | t->err_count++; |
554 | else | |
555 | t->err_count = 1; | |
556 | t->err_time = jiffies; | |
557 | out: | |
c73cb5a2 | 558 | return err; |
1da177e4 LT |
559 | } |
560 | ||
218774dc HFS |
561 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
562 | const struct in6_addr *v6addr) | |
563 | { | |
564 | __be32 v4embed = 0; | |
565 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
566 | return true; | |
567 | return false; | |
568 | } | |
569 | ||
7df37ff3 CB |
570 | /* Checks if an address matches an address on the tunnel interface. |
571 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
572 | * Long story: | |
573 | * This function is called after we considered the packet as spoofed | |
574 | * in is_spoofed_6rd. | |
575 | * We may have a router that is doing NAT for proto 41 packets | |
576 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
577 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
578 | * function will return true, dropping the packet. | |
579 | * But, we can still check if is spoofed against the IP | |
580 | * addresses associated with the interface. | |
581 | */ | |
582 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
583 | const struct in6_addr *v6dst) | |
584 | { | |
585 | int prefix_len; | |
586 | ||
587 | #ifdef CONFIG_IPV6_SIT_6RD | |
588 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
589 | - tunnel->ip6rd.relay_prefixlen; | |
590 | #else | |
591 | prefix_len = 48; | |
592 | #endif | |
593 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
594 | } | |
595 | ||
596 | /* Returns true if a packet is spoofed */ | |
597 | static bool packet_is_spoofed(struct sk_buff *skb, | |
598 | const struct iphdr *iph, | |
599 | struct ip_tunnel *tunnel) | |
600 | { | |
601 | const struct ipv6hdr *ipv6h; | |
602 | ||
603 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
604 | if (!isatap_chksrc(skb, iph, tunnel)) | |
605 | return true; | |
606 | ||
607 | return false; | |
608 | } | |
609 | ||
610 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
611 | return false; | |
612 | ||
613 | ipv6h = ipv6_hdr(skb); | |
614 | ||
615 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
616 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
617 | &iph->saddr, &ipv6h->saddr, | |
618 | &iph->daddr, &ipv6h->daddr); | |
619 | return true; | |
620 | } | |
621 | ||
622 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
623 | return false; | |
624 | ||
625 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
626 | return false; | |
627 | ||
628 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
629 | &iph->saddr, &ipv6h->saddr, | |
630 | &iph->daddr, &ipv6h->daddr); | |
631 | return true; | |
632 | } | |
633 | ||
1da177e4 LT |
634 | static int ipip6_rcv(struct sk_buff *skb) |
635 | { | |
1ad759d8 | 636 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 637 | struct ip_tunnel *tunnel; |
f4e0b4c5 | 638 | int err; |
1da177e4 | 639 | |
4fddbf5d SH |
640 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
641 | iph->saddr, iph->daddr); | |
53b24b8f | 642 | if (tunnel) { |
8f84985f | 643 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 644 | |
32b8a8e5 ND |
645 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
646 | tunnel->parms.iph.protocol != 0) | |
647 | goto out; | |
648 | ||
b0e380b1 | 649 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 650 | skb_reset_network_header(skb); |
8cdfab8a | 651 | IPCB(skb)->flags = 0; |
a09a4c8d | 652 | skb->dev = tunnel->dev; |
c7dc89c0 | 653 | |
7df37ff3 CB |
654 | if (packet_is_spoofed(skb, iph, tunnel)) { |
655 | tunnel->dev->stats.rx_errors++; | |
656 | goto out; | |
f4e0b4c5 ND |
657 | } |
658 | ||
a09a4c8d JG |
659 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
660 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
661 | goto out; | |
f4e0b4c5 ND |
662 | |
663 | err = IP_ECN_decapsulate(iph, skb); | |
664 | if (unlikely(err)) { | |
665 | if (log_ecn_error) | |
666 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
667 | &iph->saddr, iph->tos); | |
668 | if (err > 1) { | |
669 | ++tunnel->dev->stats.rx_frame_errors; | |
670 | ++tunnel->dev->stats.rx_errors; | |
671 | goto out; | |
672 | } | |
c7dc89c0 | 673 | } |
d19d56dd | 674 | |
15fc1f70 | 675 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 676 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
677 | tstats->rx_packets++; |
678 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 679 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 680 | |
caf586e5 | 681 | netif_rx(skb); |
8990f468 | 682 | |
1da177e4 LT |
683 | return 0; |
684 | } | |
685 | ||
6dcdd1b3 | 686 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 687 | return 1; |
1da177e4 | 688 | out: |
36ca34cc | 689 | kfree_skb(skb); |
1da177e4 LT |
690 | return 0; |
691 | } | |
692 | ||
49dbe7ae | 693 | static const struct tnl_ptk_info ipip_tpi = { |
32b8a8e5 ND |
694 | /* no tunnel info required for ipip. */ |
695 | .proto = htons(ETH_P_IP), | |
696 | }; | |
697 | ||
49dbe7ae SH |
698 | #if IS_ENABLED(CONFIG_MPLS) |
699 | static const struct tnl_ptk_info mplsip_tpi = { | |
700 | /* no tunnel info required for mplsip. */ | |
701 | .proto = htons(ETH_P_MPLS_UC), | |
702 | }; | |
703 | #endif | |
704 | ||
705 | static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
32b8a8e5 | 706 | { |
3d7b46cd | 707 | const struct iphdr *iph; |
32b8a8e5 ND |
708 | struct ip_tunnel *tunnel; |
709 | ||
3d7b46cd | 710 | iph = ip_hdr(skb); |
32b8a8e5 ND |
711 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
712 | iph->saddr, iph->daddr); | |
53b24b8f | 713 | if (tunnel) { |
49dbe7ae SH |
714 | const struct tnl_ptk_info *tpi; |
715 | ||
716 | if (tunnel->parms.iph.protocol != ipproto && | |
32b8a8e5 ND |
717 | tunnel->parms.iph.protocol != 0) |
718 | goto drop; | |
719 | ||
720 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
721 | goto drop; | |
49dbe7ae SH |
722 | #if IS_ENABLED(CONFIG_MPLS) |
723 | if (ipproto == IPPROTO_MPLS) | |
724 | tpi = &mplsip_tpi; | |
725 | else | |
726 | #endif | |
727 | tpi = &ipip_tpi; | |
728 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 729 | goto drop; |
49dbe7ae | 730 | return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
32b8a8e5 ND |
731 | } |
732 | ||
733 | return 1; | |
734 | ||
735 | drop: | |
736 | kfree_skb(skb); | |
737 | return 0; | |
738 | } | |
739 | ||
49dbe7ae SH |
740 | static int ipip_rcv(struct sk_buff *skb) |
741 | { | |
742 | return sit_tunnel_rcv(skb, IPPROTO_IPIP); | |
743 | } | |
744 | ||
745 | #if IS_ENABLED(CONFIG_MPLS) | |
746 | static int mplsip_rcv(struct sk_buff *skb) | |
747 | { | |
748 | return sit_tunnel_rcv(skb, IPPROTO_MPLS); | |
749 | } | |
750 | #endif | |
751 | ||
fa857afc | 752 | /* |
218774dc HFS |
753 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
754 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 755 | */ |
218774dc HFS |
756 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
757 | __be32 *v4dst) | |
1da177e4 | 758 | { |
fa857afc YH |
759 | #ifdef CONFIG_IPV6_SIT_6RD |
760 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
761 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 762 | unsigned int pbw0, pbi0; |
fa857afc YH |
763 | int pbi1; |
764 | u32 d; | |
765 | ||
766 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
767 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
768 | ||
e7db38c3 | 769 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
770 | tunnel->ip6rd.relay_prefixlen; |
771 | ||
772 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
773 | if (pbi1 > 0) | |
e7db38c3 | 774 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
775 | (32 - pbi1); |
776 | ||
218774dc HFS |
777 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
778 | return true; | |
fa857afc YH |
779 | } |
780 | #else | |
1da177e4 | 781 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 782 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
783 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
784 | return true; | |
1da177e4 | 785 | } |
fa857afc | 786 | #endif |
218774dc HFS |
787 | return false; |
788 | } | |
789 | ||
790 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
791 | const struct in6_addr *v6dst) | |
792 | { | |
793 | __be32 dst = 0; | |
794 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
795 | return dst; |
796 | } | |
797 | ||
798 | /* | |
799 | * This function assumes it is being called from dev_queue_xmit() | |
800 | * and that skb is filled properly by that function. | |
801 | */ | |
802 | ||
6fef4c0c SH |
803 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
804 | struct net_device *dev) | |
1da177e4 | 805 | { |
2941a486 | 806 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
807 | const struct iphdr *tiph = &tunnel->parms.iph; |
808 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 809 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 810 | __be16 df = tiph->frag_off; |
67ba4152 IM |
811 | struct rtable *rt; /* Route to the other host */ |
812 | struct net_device *tdev; /* Device to other host */ | |
813 | unsigned int max_headroom; /* The extra header space needed */ | |
e69a4adc | 814 | __be32 dst = tiph->daddr; |
31e4543d | 815 | struct flowi4 fl4; |
1da177e4 | 816 | int mtu; |
b71d1d42 | 817 | const struct in6_addr *addr6; |
1da177e4 | 818 | int addr_type; |
0e6fbc5b | 819 | u8 ttl; |
14909664 TH |
820 | u8 protocol = IPPROTO_IPV6; |
821 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1da177e4 | 822 | |
c2bceb3d LEM |
823 | if (tos == 1) |
824 | tos = ipv6_get_dsfield(iph6); | |
825 | ||
c7dc89c0 FT |
826 | /* ISATAP (RFC4214) - must come before 6to4 */ |
827 | if (dev->priv_flags & IFF_ISATAP) { | |
828 | struct neighbour *neigh = NULL; | |
1e2927b0 | 829 | bool do_tx_error = false; |
c7dc89c0 | 830 | |
adf30907 | 831 | if (skb_dst(skb)) |
1e2927b0 | 832 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 | 833 | |
63159f29 | 834 | if (!neigh) { |
7df37ff3 | 835 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
836 | goto tx_error; |
837 | } | |
838 | ||
3e866703 | 839 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
840 | addr_type = ipv6_addr_type(addr6); |
841 | ||
842 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
843 | ipv6_addr_is_isatap(addr6)) | |
844 | dst = addr6->s6_addr32[3]; | |
845 | else | |
1e2927b0 DM |
846 | do_tx_error = true; |
847 | ||
848 | neigh_release(neigh); | |
849 | if (do_tx_error) | |
c7dc89c0 FT |
850 | goto tx_error; |
851 | } | |
852 | ||
1da177e4 | 853 | if (!dst) |
218774dc | 854 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
855 | |
856 | if (!dst) { | |
857 | struct neighbour *neigh = NULL; | |
1e2927b0 | 858 | bool do_tx_error = false; |
1da177e4 | 859 | |
adf30907 | 860 | if (skb_dst(skb)) |
1e2927b0 | 861 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 | 862 | |
63159f29 | 863 | if (!neigh) { |
7df37ff3 | 864 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
865 | goto tx_error; |
866 | } | |
867 | ||
3e866703 | 868 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
869 | addr_type = ipv6_addr_type(addr6); |
870 | ||
871 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 872 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
873 | addr_type = ipv6_addr_type(addr6); |
874 | } | |
875 | ||
1e2927b0 DM |
876 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
877 | dst = addr6->s6_addr32[3]; | |
878 | else | |
879 | do_tx_error = true; | |
1da177e4 | 880 | |
1e2927b0 DM |
881 | neigh_release(neigh); |
882 | if (do_tx_error) | |
883 | goto tx_error; | |
1da177e4 LT |
884 | } |
885 | ||
9830ad4c CG |
886 | flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
887 | RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, | |
888 | 0, dst, tiph->saddr, 0, 0, | |
889 | sock_net_uid(tunnel->net, NULL)); | |
890 | rt = ip_route_output_flow(tunnel->net, &fl4, NULL); | |
891 | ||
78fbfd8a DM |
892 | if (IS_ERR(rt)) { |
893 | dev->stats.tx_carrier_errors++; | |
894 | goto tx_error_icmp; | |
1da177e4 LT |
895 | } |
896 | if (rt->rt_type != RTN_UNICAST) { | |
897 | ip_rt_put(rt); | |
15fc1f70 | 898 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
899 | goto tx_error_icmp; |
900 | } | |
d8d1f30b | 901 | tdev = rt->dst.dev; |
1da177e4 LT |
902 | |
903 | if (tdev == dev) { | |
904 | ip_rt_put(rt); | |
15fc1f70 | 905 | dev->stats.collisions++; |
1da177e4 LT |
906 | goto tx_error; |
907 | } | |
908 | ||
7e13318d | 909 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
14909664 | 910 | ip_rt_put(rt); |
aed069df | 911 | goto tx_error; |
14909664 TH |
912 | } |
913 | ||
292f4f3c | 914 | if (df) { |
14909664 | 915 | mtu = dst_mtu(&rt->dst) - t_hlen; |
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 | */ | |
14909664 | 950 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; |
1da177e4 | 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 | |
14909664 | 972 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
6a9eadcc | 973 | ip_rt_put(rt); |
14909664 | 974 | goto tx_error; |
6a9eadcc | 975 | } |
3d483058 | 976 | |
469471cd TH |
977 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
978 | ||
039f5062 PS |
979 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
980 | df, !net_eq(tunnel->net, dev_net(dev))); | |
6ed10654 | 981 | return NETDEV_TX_OK; |
1da177e4 LT |
982 | |
983 | tx_error_icmp: | |
984 | dst_link_failure(skb); | |
985 | tx_error: | |
66028310 | 986 | kfree_skb(skb); |
61c1db7f | 987 | dev->stats.tx_errors++; |
6ed10654 | 988 | return NETDEV_TX_OK; |
1da177e4 LT |
989 | } |
990 | ||
49dbe7ae SH |
991 | static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
992 | struct net_device *dev, u8 ipproto) | |
32b8a8e5 ND |
993 | { |
994 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
995 | const struct iphdr *tiph = &tunnel->parms.iph; | |
996 | ||
7e13318d | 997 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 998 | goto tx_error; |
32b8a8e5 | 999 | |
49dbe7ae | 1000 | skb_set_inner_ipproto(skb, ipproto); |
469471cd | 1001 | |
49dbe7ae | 1002 | ip_tunnel_xmit(skb, dev, tiph, ipproto); |
32b8a8e5 | 1003 | return NETDEV_TX_OK; |
aed069df AD |
1004 | tx_error: |
1005 | kfree_skb(skb); | |
61c1db7f ED |
1006 | dev->stats.tx_errors++; |
1007 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1008 | } |
1009 | ||
1010 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1011 | struct net_device *dev) | |
1012 | { | |
1013 | switch (skb->protocol) { | |
1014 | case htons(ETH_P_IP): | |
49dbe7ae | 1015 | sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
32b8a8e5 ND |
1016 | break; |
1017 | case htons(ETH_P_IPV6): | |
1018 | ipip6_tunnel_xmit(skb, dev); | |
1019 | break; | |
49dbe7ae SH |
1020 | #if IS_ENABLED(CONFIG_MPLS) |
1021 | case htons(ETH_P_MPLS_UC): | |
1022 | sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); | |
1023 | break; | |
1024 | #endif | |
32b8a8e5 ND |
1025 | default: |
1026 | goto tx_err; | |
1027 | } | |
1028 | ||
1029 | return NETDEV_TX_OK; | |
1030 | ||
1031 | tx_err: | |
1032 | dev->stats.tx_errors++; | |
66028310 | 1033 | kfree_skb(skb); |
32b8a8e5 ND |
1034 | return NETDEV_TX_OK; |
1035 | ||
1036 | } | |
1037 | ||
8a4a50f9 MS |
1038 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1039 | { | |
1040 | struct net_device *tdev = NULL; | |
1041 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1042 | const struct iphdr *iph; |
31e4543d | 1043 | struct flowi4 fl4; |
8a4a50f9 MS |
1044 | |
1045 | tunnel = netdev_priv(dev); | |
1046 | iph = &tunnel->parms.iph; | |
1047 | ||
1048 | if (iph->daddr) { | |
5e6700b3 ND |
1049 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1050 | NULL, | |
78fbfd8a DM |
1051 | iph->daddr, iph->saddr, |
1052 | 0, 0, | |
1053 | IPPROTO_IPV6, | |
1054 | RT_TOS(iph->tos), | |
1055 | tunnel->parms.link); | |
b23dd4fe DM |
1056 | |
1057 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1058 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1059 | ip_rt_put(rt); |
1060 | } | |
1061 | dev->flags |= IFF_POINTOPOINT; | |
1062 | } | |
1063 | ||
1064 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1065 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 MS |
1066 | |
1067 | if (tdev) { | |
14909664 TH |
1068 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1069 | ||
8a4a50f9 | 1070 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
14909664 | 1071 | dev->mtu = tdev->mtu - t_hlen; |
8a4a50f9 MS |
1072 | if (dev->mtu < IPV6_MIN_MTU) |
1073 | dev->mtu = IPV6_MIN_MTU; | |
1074 | } | |
8a4a50f9 MS |
1075 | } |
1076 | ||
9830ad4c CG |
1077 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
1078 | __u32 fwmark) | |
f3723416 | 1079 | { |
5e6700b3 | 1080 | struct net *net = t->net; |
f3723416 ND |
1081 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1082 | ||
1083 | ipip6_tunnel_unlink(sitn, t); | |
1084 | synchronize_net(); | |
1085 | t->parms.iph.saddr = p->iph.saddr; | |
1086 | t->parms.iph.daddr = p->iph.daddr; | |
1087 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1088 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1089 | ipip6_tunnel_link(sitn, t); | |
1090 | t->parms.iph.ttl = p->iph.ttl; | |
1091 | t->parms.iph.tos = p->iph.tos; | |
dacf1273 | 1092 | t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c | 1093 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
f3723416 | 1094 | t->parms.link = p->link; |
9830ad4c | 1095 | t->fwmark = fwmark; |
f3723416 ND |
1096 | ipip6_tunnel_bind_dev(t->dev); |
1097 | } | |
e09acddf | 1098 | dst_cache_reset(&t->dst_cache); |
f3723416 ND |
1099 | netdev_state_change(t->dev); |
1100 | } | |
1101 | ||
e2f1f072 ND |
1102 | #ifdef CONFIG_IPV6_SIT_6RD |
1103 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1104 | struct ip_tunnel_6rd *ip6rd) | |
1105 | { | |
1106 | struct in6_addr prefix; | |
1107 | __be32 relay_prefix; | |
1108 | ||
1109 | if (ip6rd->relay_prefixlen > 32 || | |
1110 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1111 | return -EINVAL; | |
1112 | ||
1113 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1114 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1115 | return -EINVAL; | |
1116 | if (ip6rd->relay_prefixlen) | |
1117 | relay_prefix = ip6rd->relay_prefix & | |
1118 | htonl(0xffffffffUL << | |
1119 | (32 - ip6rd->relay_prefixlen)); | |
1120 | else | |
1121 | relay_prefix = 0; | |
1122 | if (relay_prefix != ip6rd->relay_prefix) | |
1123 | return -EINVAL; | |
1124 | ||
1125 | t->ip6rd.prefix = prefix; | |
1126 | t->ip6rd.relay_prefix = relay_prefix; | |
1127 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1128 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
e09acddf | 1129 | dst_cache_reset(&t->dst_cache); |
e2f1f072 ND |
1130 | netdev_state_change(t->dev); |
1131 | return 0; | |
1132 | } | |
1133 | #endif | |
1134 | ||
03ff4979 | 1135 | static bool ipip6_valid_ip_proto(u8 ipproto) |
49dbe7ae SH |
1136 | { |
1137 | return ipproto == IPPROTO_IPV6 || | |
1138 | ipproto == IPPROTO_IPIP || | |
1139 | #if IS_ENABLED(CONFIG_MPLS) | |
1140 | ipproto == IPPROTO_MPLS || | |
1141 | #endif | |
1142 | ipproto == 0; | |
1143 | } | |
1144 | ||
1da177e4 | 1145 | static int |
67ba4152 | 1146 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1147 | { |
1148 | int err = 0; | |
1149 | struct ip_tunnel_parm p; | |
fadf6bf0 | 1150 | struct ip_tunnel_prl prl; |
9aad77c3 ND |
1151 | struct ip_tunnel *t = netdev_priv(dev); |
1152 | struct net *net = t->net; | |
ca8def14 | 1153 | struct sit_net *sitn = net_generic(net, sit_net_id); |
fa857afc YH |
1154 | #ifdef CONFIG_IPV6_SIT_6RD |
1155 | struct ip_tunnel_6rd ip6rd; | |
1156 | #endif | |
1da177e4 LT |
1157 | |
1158 | switch (cmd) { | |
1159 | case SIOCGETTUNNEL: | |
fa857afc YH |
1160 | #ifdef CONFIG_IPV6_SIT_6RD |
1161 | case SIOCGET6RD: | |
1162 | #endif | |
cd3dbc19 | 1163 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1164 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1165 | err = -EFAULT; | |
1166 | break; | |
1167 | } | |
ca8def14 | 1168 | t = ipip6_tunnel_locate(net, &p, 0); |
63159f29 | 1169 | if (!t) |
9aad77c3 | 1170 | t = netdev_priv(dev); |
1da177e4 | 1171 | } |
fa857afc YH |
1172 | |
1173 | err = -EFAULT; | |
1174 | if (cmd == SIOCGETTUNNEL) { | |
1175 | memcpy(&p, &t->parms, sizeof(p)); | |
1176 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1177 | sizeof(p))) | |
1178 | goto done; | |
1179 | #ifdef CONFIG_IPV6_SIT_6RD | |
1180 | } else { | |
4e3fd7a0 | 1181 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
1182 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
1183 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1184 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1185 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1186 | sizeof(ip6rd))) | |
1187 | goto done; | |
1188 | #endif | |
1189 | } | |
1190 | err = 0; | |
1da177e4 LT |
1191 | break; |
1192 | ||
1193 | case SIOCADDTUNNEL: | |
1194 | case SIOCCHGTUNNEL: | |
1195 | err = -EPERM; | |
af31f412 | 1196 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1197 | goto done; |
1198 | ||
1199 | err = -EFAULT; | |
1200 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1201 | goto done; | |
1202 | ||
1203 | err = -EINVAL; | |
49dbe7ae | 1204 | if (!ipip6_valid_ip_proto(p.iph.protocol)) |
32b8a8e5 ND |
1205 | goto done; |
1206 | if (p.iph.version != 4 || | |
1da177e4 LT |
1207 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
1208 | goto done; | |
1209 | if (p.iph.ttl) | |
1210 | p.iph.frag_off |= htons(IP_DF); | |
1211 | ||
ca8def14 | 1212 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1213 | |
cd3dbc19 | 1214 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
53b24b8f | 1215 | if (t) { |
1da177e4 LT |
1216 | if (t->dev != dev) { |
1217 | err = -EEXIST; | |
1218 | break; | |
1219 | } | |
1220 | } else { | |
1221 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1222 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1223 | err = -EINVAL; | |
1224 | break; | |
1225 | } | |
2941a486 | 1226 | t = netdev_priv(dev); |
1da177e4 | 1227 | } |
f9cd5a55 | 1228 | |
9830ad4c | 1229 | ipip6_tunnel_update(t, &p, t->fwmark); |
1da177e4 LT |
1230 | } |
1231 | ||
1232 | if (t) { | |
1233 | err = 0; | |
1da177e4 LT |
1234 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1235 | err = -EFAULT; | |
1236 | } else | |
1237 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1238 | break; | |
1239 | ||
1240 | case SIOCDELTUNNEL: | |
1241 | err = -EPERM; | |
af31f412 | 1242 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1243 | goto done; |
1244 | ||
cd3dbc19 | 1245 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1246 | err = -EFAULT; |
1247 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1248 | goto done; | |
1249 | err = -ENOENT; | |
e5d08d71 | 1250 | t = ipip6_tunnel_locate(net, &p, 0); |
63159f29 | 1251 | if (!t) |
1da177e4 LT |
1252 | goto done; |
1253 | err = -EPERM; | |
cd3dbc19 | 1254 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1255 | goto done; |
1256 | dev = t->dev; | |
1257 | } | |
22f8cde5 SH |
1258 | unregister_netdevice(dev); |
1259 | err = 0; | |
1da177e4 LT |
1260 | break; |
1261 | ||
300aaeea | 1262 | case SIOCGETPRL: |
2b4743bd YH |
1263 | err = -EINVAL; |
1264 | if (dev == sitn->fb_tunnel_dev) | |
1265 | goto done; | |
2b4743bd YH |
1266 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); |
1267 | break; | |
1268 | ||
fadf6bf0 TF |
1269 | case SIOCADDPRL: |
1270 | case SIOCDELPRL: | |
1271 | case SIOCCHGPRL: | |
1272 | err = -EPERM; | |
af31f412 | 1273 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fadf6bf0 TF |
1274 | goto done; |
1275 | err = -EINVAL; | |
cd3dbc19 | 1276 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1277 | goto done; |
1278 | err = -EFAULT; | |
1279 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1280 | goto done; | |
fadf6bf0 | 1281 | |
300aaeea | 1282 | switch (cmd) { |
300aaeea | 1283 | case SIOCDELPRL: |
fadf6bf0 | 1284 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1285 | break; |
1286 | case SIOCADDPRL: | |
1287 | case SIOCCHGPRL: | |
fadf6bf0 | 1288 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1289 | break; |
1290 | } | |
e09acddf | 1291 | dst_cache_reset(&t->dst_cache); |
2b4743bd | 1292 | netdev_state_change(dev); |
fadf6bf0 TF |
1293 | break; |
1294 | ||
fa857afc YH |
1295 | #ifdef CONFIG_IPV6_SIT_6RD |
1296 | case SIOCADD6RD: | |
1297 | case SIOCCHG6RD: | |
1298 | case SIOCDEL6RD: | |
1299 | err = -EPERM; | |
af31f412 | 1300 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fa857afc YH |
1301 | goto done; |
1302 | ||
1303 | err = -EFAULT; | |
1304 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1305 | sizeof(ip6rd))) | |
1306 | goto done; | |
1307 | ||
fa857afc | 1308 | if (cmd != SIOCDEL6RD) { |
e2f1f072 ND |
1309 | err = ipip6_tunnel_update_6rd(t, &ip6rd); |
1310 | if (err < 0) | |
fa857afc | 1311 | goto done; |
fa857afc | 1312 | } else |
e0c93948 | 1313 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1314 | |
1315 | err = 0; | |
1316 | break; | |
1317 | #endif | |
1318 | ||
1da177e4 LT |
1319 | default: |
1320 | err = -EINVAL; | |
1321 | } | |
1322 | ||
1323 | done: | |
1324 | return err; | |
1325 | } | |
1326 | ||
1326c3d5 | 1327 | static const struct net_device_ops ipip6_netdev_ops = { |
ebe084aa | 1328 | .ndo_init = ipip6_tunnel_init, |
1326c3d5 | 1329 | .ndo_uninit = ipip6_tunnel_uninit, |
32b8a8e5 | 1330 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 | 1331 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
f61dd388 | 1332 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1e99584b | 1333 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1326c3d5 SH |
1334 | }; |
1335 | ||
15fc1f70 ED |
1336 | static void ipip6_dev_free(struct net_device *dev) |
1337 | { | |
cf71d2bc ND |
1338 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1339 | ||
e09acddf | 1340 | dst_cache_destroy(&tunnel->dst_cache); |
15fc1f70 | 1341 | free_percpu(dev->tstats); |
15fc1f70 ED |
1342 | } |
1343 | ||
61c1db7f ED |
1344 | #define SIT_FEATURES (NETIF_F_SG | \ |
1345 | NETIF_F_FRAGLIST | \ | |
1346 | NETIF_F_HIGHDMA | \ | |
1347 | NETIF_F_GSO_SOFTWARE | \ | |
1348 | NETIF_F_HW_CSUM) | |
1349 | ||
1da177e4 LT |
1350 | static void ipip6_tunnel_setup(struct net_device *dev) |
1351 | { | |
14909664 TH |
1352 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1353 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1354 | ||
1326c3d5 | 1355 | dev->netdev_ops = &ipip6_netdev_ops; |
cf124db5 DM |
1356 | dev->needs_free_netdev = true; |
1357 | dev->priv_destructor = ipip6_dev_free; | |
1da177e4 LT |
1358 | |
1359 | dev->type = ARPHRD_SIT; | |
14909664 TH |
1360 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
1361 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
b96f9afe JW |
1362 | dev->min_mtu = IPV6_MIN_MTU; |
1363 | dev->max_mtu = 0xFFF8 - t_hlen; | |
1da177e4 | 1364 | dev->flags = IFF_NOARP; |
02875878 | 1365 | netif_keep_dst(dev); |
1da177e4 | 1366 | dev->addr_len = 4; |
8df40d10 | 1367 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1368 | dev->features |= SIT_FEATURES; |
1369 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1370 | } |
1371 | ||
15fc1f70 | 1372 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1373 | { |
1326c3d5 | 1374 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e09acddf | 1375 | int err; |
1da177e4 LT |
1376 | |
1377 | tunnel->dev = dev; | |
5e6700b3 | 1378 | tunnel->net = dev_net(dev); |
ebe084aa | 1379 | strcpy(tunnel->parms.name, dev->name); |
1da177e4 | 1380 | |
8a4a50f9 | 1381 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1382 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1383 | if (!dev->tstats) |
1384 | return -ENOMEM; | |
1385 | ||
e09acddf PA |
1386 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1387 | if (err) { | |
cf71d2bc | 1388 | free_percpu(dev->tstats); |
d7426c69 | 1389 | dev->tstats = NULL; |
e09acddf | 1390 | return err; |
cf71d2bc ND |
1391 | } |
1392 | ||
15fc1f70 | 1393 | return 0; |
1da177e4 LT |
1394 | } |
1395 | ||
4ece9009 | 1396 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1397 | { |
2941a486 | 1398 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1399 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1400 | struct net *net = dev_net(dev); |
1401 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 | 1402 | |
1da177e4 LT |
1403 | iph->version = 4; |
1404 | iph->protocol = IPPROTO_IPV6; | |
1405 | iph->ihl = 5; | |
1406 | iph->ttl = 64; | |
1407 | ||
1408 | dev_hold(dev); | |
cf778b00 | 1409 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
1da177e4 LT |
1410 | } |
1411 | ||
a8b8a889 MS |
1412 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
1413 | struct netlink_ext_ack *extack) | |
32b8a8e5 ND |
1414 | { |
1415 | u8 proto; | |
1416 | ||
c2ff682a | 1417 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1418 | return 0; |
1419 | ||
1420 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
49dbe7ae | 1421 | if (!ipip6_valid_ip_proto(proto)) |
32b8a8e5 ND |
1422 | return -EINVAL; |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
f3723416 | 1427 | static void ipip6_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
1428 | struct ip_tunnel_parm *parms, |
1429 | __u32 *fwmark) | |
f3723416 ND |
1430 | { |
1431 | memset(parms, 0, sizeof(*parms)); | |
1432 | ||
1433 | parms->iph.version = 4; | |
1434 | parms->iph.protocol = IPPROTO_IPV6; | |
1435 | parms->iph.ihl = 5; | |
1436 | parms->iph.ttl = 64; | |
1437 | ||
1438 | if (!data) | |
1439 | return; | |
1440 | ||
1441 | if (data[IFLA_IPTUN_LINK]) | |
1442 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1443 | ||
1444 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1445 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1446 | |
1447 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1448 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1449 | |
1450 | if (data[IFLA_IPTUN_TTL]) { | |
1451 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1452 | if (parms->iph.ttl) | |
1453 | parms->iph.frag_off = htons(IP_DF); | |
1454 | } | |
1455 | ||
1456 | if (data[IFLA_IPTUN_TOS]) | |
1457 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1458 | ||
1459 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1460 | parms->iph.frag_off = htons(IP_DF); | |
1461 | ||
1462 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1463 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1464 | |
1465 | if (data[IFLA_IPTUN_PROTO]) | |
1466 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1467 | ||
9830ad4c CG |
1468 | if (data[IFLA_IPTUN_FWMARK]) |
1469 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
f3723416 ND |
1470 | } |
1471 | ||
14909664 TH |
1472 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1473 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1474 | struct ip_tunnel_encap *ipencap) | |
1475 | { | |
1476 | bool ret = false; | |
1477 | ||
1478 | memset(ipencap, 0, sizeof(*ipencap)); | |
1479 | ||
1480 | if (!data) | |
1481 | return ret; | |
1482 | ||
1483 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1484 | ret = true; | |
1485 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1486 | } | |
1487 | ||
1488 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1489 | ret = true; | |
1490 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1491 | } | |
1492 | ||
1493 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1494 | ret = true; | |
a409caec | 1495 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
14909664 TH |
1496 | } |
1497 | ||
1498 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1499 | ret = true; | |
a409caec | 1500 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
14909664 TH |
1501 | } |
1502 | ||
1503 | return ret; | |
1504 | } | |
1505 | ||
e2f1f072 ND |
1506 | #ifdef CONFIG_IPV6_SIT_6RD |
1507 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1508 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1509 | struct ip_tunnel_6rd *ip6rd) | |
1510 | { | |
1511 | bool ret = false; | |
1512 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1513 | ||
1514 | if (!data) | |
1515 | return ret; | |
1516 | ||
1517 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1518 | ret = true; | |
67b61f6c | 1519 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
e2f1f072 ND |
1520 | } |
1521 | ||
1522 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1523 | ret = true; | |
1524 | ip6rd->relay_prefix = | |
1525 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1526 | } | |
1527 | ||
1528 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1529 | ret = true; | |
1530 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1531 | } | |
1532 | ||
1533 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1534 | ret = true; | |
1535 | ip6rd->relay_prefixlen = | |
1536 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1537 | } | |
1538 | ||
1539 | return ret; | |
1540 | } | |
1541 | #endif | |
1542 | ||
f3723416 | 1543 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1544 | struct nlattr *tb[], struct nlattr *data[], |
1545 | struct netlink_ext_ack *extack) | |
f3723416 ND |
1546 | { |
1547 | struct net *net = dev_net(dev); | |
1548 | struct ip_tunnel *nt; | |
14909664 | 1549 | struct ip_tunnel_encap ipencap; |
e2f1f072 ND |
1550 | #ifdef CONFIG_IPV6_SIT_6RD |
1551 | struct ip_tunnel_6rd ip6rd; | |
1552 | #endif | |
1553 | int err; | |
f3723416 ND |
1554 | |
1555 | nt = netdev_priv(dev); | |
14909664 TH |
1556 | |
1557 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1558 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1559 | if (err < 0) | |
1560 | return err; | |
1561 | } | |
1562 | ||
9830ad4c | 1563 | ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
f3723416 ND |
1564 | |
1565 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1566 | return -EEXIST; | |
1567 | ||
e2f1f072 ND |
1568 | err = ipip6_tunnel_create(dev); |
1569 | if (err < 0) | |
1570 | return err; | |
1571 | ||
1572 | #ifdef CONFIG_IPV6_SIT_6RD | |
1573 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1574 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1575 | #endif | |
1576 | ||
1577 | return err; | |
f3723416 ND |
1578 | } |
1579 | ||
1580 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
1581 | struct nlattr *data[], |
1582 | struct netlink_ext_ack *extack) | |
f3723416 | 1583 | { |
86bd68bf | 1584 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1585 | struct ip_tunnel_parm p; |
14909664 | 1586 | struct ip_tunnel_encap ipencap; |
86bd68bf | 1587 | struct net *net = t->net; |
f3723416 | 1588 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1589 | #ifdef CONFIG_IPV6_SIT_6RD |
1590 | struct ip_tunnel_6rd ip6rd; | |
1591 | #endif | |
9830ad4c | 1592 | __u32 fwmark = t->fwmark; |
14909664 | 1593 | int err; |
f3723416 ND |
1594 | |
1595 | if (dev == sitn->fb_tunnel_dev) | |
1596 | return -EINVAL; | |
1597 | ||
14909664 TH |
1598 | if (ipip6_netlink_encap_parms(data, &ipencap)) { |
1599 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1600 | if (err < 0) | |
1601 | return err; | |
1602 | } | |
1603 | ||
9830ad4c | 1604 | ipip6_netlink_parms(data, &p, &fwmark); |
f3723416 ND |
1605 | |
1606 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1607 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1608 | return -EINVAL; | |
1609 | ||
1610 | t = ipip6_tunnel_locate(net, &p, 0); | |
1611 | ||
1612 | if (t) { | |
1613 | if (t->dev != dev) | |
1614 | return -EEXIST; | |
1615 | } else | |
1616 | t = netdev_priv(dev); | |
1617 | ||
9830ad4c | 1618 | ipip6_tunnel_update(t, &p, fwmark); |
e2f1f072 ND |
1619 | |
1620 | #ifdef CONFIG_IPV6_SIT_6RD | |
1621 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1622 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1623 | #endif | |
1624 | ||
f3723416 ND |
1625 | return 0; |
1626 | } | |
1627 | ||
e4c94a9c | 1628 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1629 | { |
1630 | return | |
1631 | /* IFLA_IPTUN_LINK */ | |
1632 | nla_total_size(4) + | |
1633 | /* IFLA_IPTUN_LOCAL */ | |
1634 | nla_total_size(4) + | |
1635 | /* IFLA_IPTUN_REMOTE */ | |
1636 | nla_total_size(4) + | |
1637 | /* IFLA_IPTUN_TTL */ | |
1638 | nla_total_size(1) + | |
1639 | /* IFLA_IPTUN_TOS */ | |
1640 | nla_total_size(1) + | |
a12c9a85 ND |
1641 | /* IFLA_IPTUN_PMTUDISC */ |
1642 | nla_total_size(1) + | |
1643 | /* IFLA_IPTUN_FLAGS */ | |
1644 | nla_total_size(2) + | |
32b8a8e5 ND |
1645 | /* IFLA_IPTUN_PROTO */ |
1646 | nla_total_size(1) + | |
e2f1f072 ND |
1647 | #ifdef CONFIG_IPV6_SIT_6RD |
1648 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1649 | nla_total_size(sizeof(struct in6_addr)) + | |
1650 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1651 | nla_total_size(4) + | |
1652 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1653 | nla_total_size(2) + | |
1654 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1655 | nla_total_size(2) + | |
1656 | #endif | |
14909664 TH |
1657 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1658 | nla_total_size(2) + | |
1659 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1660 | nla_total_size(2) + | |
1661 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1662 | nla_total_size(2) + | |
1663 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1664 | nla_total_size(2) + | |
9830ad4c CG |
1665 | /* IFLA_IPTUN_FWMARK */ |
1666 | nla_total_size(4) + | |
ba3e3f50 ND |
1667 | 0; |
1668 | } | |
1669 | ||
e4c94a9c | 1670 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1671 | { |
1672 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1673 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1674 | ||
1675 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1676 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
1677 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
ba3e3f50 | 1678 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
a12c9a85 ND |
1679 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1680 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1681 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1682 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
9830ad4c CG |
1683 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
1684 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
ba3e3f50 | 1685 | goto nla_put_failure; |
e2f1f072 ND |
1686 | |
1687 | #ifdef CONFIG_IPV6_SIT_6RD | |
930345ea JB |
1688 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
1689 | &tunnel->ip6rd.prefix) || | |
1690 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1691 | tunnel->ip6rd.relay_prefix) || | |
e2f1f072 ND |
1692 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
1693 | tunnel->ip6rd.prefixlen) || | |
1694 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1695 | tunnel->ip6rd.relay_prefixlen)) | |
1696 | goto nla_put_failure; | |
1697 | #endif | |
1698 | ||
14909664 TH |
1699 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
1700 | tunnel->encap.type) || | |
a409caec | 1701 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
14909664 | 1702 | tunnel->encap.sport) || |
a409caec | 1703 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
14909664 TH |
1704 | tunnel->encap.dport) || |
1705 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
e1b2cb65 | 1706 | tunnel->encap.flags)) |
14909664 TH |
1707 | goto nla_put_failure; |
1708 | ||
ba3e3f50 ND |
1709 | return 0; |
1710 | ||
1711 | nla_put_failure: | |
1712 | return -EMSGSIZE; | |
1713 | } | |
1714 | ||
f3723416 ND |
1715 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1716 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1717 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1718 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1719 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1720 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1721 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1722 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1723 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1724 | #ifdef CONFIG_IPV6_SIT_6RD |
1725 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1726 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1727 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1728 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1729 | #endif | |
14909664 TH |
1730 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1731 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1732 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1733 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
9830ad4c | 1734 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
f3723416 ND |
1735 | }; |
1736 | ||
9434266f WB |
1737 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1738 | { | |
1739 | struct net *net = dev_net(dev); | |
1740 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1741 | ||
1742 | if (dev != sitn->fb_tunnel_dev) | |
1743 | unregister_netdevice_queue(dev, head); | |
1744 | } | |
1745 | ||
ba3e3f50 ND |
1746 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1747 | .kind = "sit", | |
1748 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1749 | .policy = ipip6_policy, |
ba3e3f50 | 1750 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1751 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1752 | .validate = ipip6_validate, |
f3723416 ND |
1753 | .newlink = ipip6_newlink, |
1754 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1755 | .get_size = ipip6_get_size, |
1756 | .fill_info = ipip6_fill_info, | |
9434266f | 1757 | .dellink = ipip6_dellink, |
1728d4fa | 1758 | .get_link_net = ip_tunnel_get_link_net, |
ba3e3f50 ND |
1759 | }; |
1760 | ||
6dcd814b | 1761 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1762 | .handler = ipip6_rcv, |
1763 | .err_handler = ipip6_err, | |
c73cb5a2 | 1764 | .priority = 1, |
1da177e4 LT |
1765 | }; |
1766 | ||
32b8a8e5 ND |
1767 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1768 | .handler = ipip_rcv, | |
1769 | .err_handler = ipip6_err, | |
1770 | .priority = 2, | |
1771 | }; | |
1772 | ||
49dbe7ae SH |
1773 | #if IS_ENABLED(CONFIG_MPLS) |
1774 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
1775 | .handler = mplsip_rcv, | |
1776 | .err_handler = ipip6_err, | |
1777 | .priority = 2, | |
1778 | }; | |
1779 | #endif | |
1780 | ||
9434266f WB |
1781 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1782 | struct list_head *head) | |
db44575f | 1783 | { |
9434266f | 1784 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1785 | struct net_device *dev, *aux; |
db44575f AK |
1786 | int prio; |
1787 | ||
5e6700b3 ND |
1788 | for_each_netdev_safe(net, dev, aux) |
1789 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1790 | unregister_netdevice_queue(dev, head); | |
1791 | ||
db44575f AK |
1792 | for (prio = 1; prio < 4; prio++) { |
1793 | int h; | |
e87a8f24 | 1794 | for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { |
753ea8e9 | 1795 | struct ip_tunnel *t; |
62808f91 | 1796 | |
753ea8e9 | 1797 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
53b24b8f | 1798 | while (t) { |
5e6700b3 ND |
1799 | /* If dev is in the same netns, it has already |
1800 | * been added to the list by the previous loop. | |
1801 | */ | |
fc8f999d | 1802 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1803 | unregister_netdevice_queue(t->dev, |
1804 | head); | |
753ea8e9 | 1805 | t = rtnl_dereference(t->next); |
62808f91 | 1806 | } |
db44575f AK |
1807 | } |
1808 | } | |
1809 | } | |
1810 | ||
2c8c1e72 | 1811 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1812 | { |
67101172 | 1813 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1814 | struct ip_tunnel *t; |
8190d900 | 1815 | int err; |
8190d900 | 1816 | |
29182176 PE |
1817 | sitn->tunnels[0] = sitn->tunnels_wc; |
1818 | sitn->tunnels[1] = sitn->tunnels_l; | |
1819 | sitn->tunnels[2] = sitn->tunnels_r; | |
1820 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1821 | ||
cd3dbc19 | 1822 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1823 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1824 | ipip6_tunnel_setup); |
1825 | if (!sitn->fb_tunnel_dev) { | |
1826 | err = -ENOMEM; | |
1827 | goto err_alloc_dev; | |
1828 | } | |
be77e593 | 1829 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1830 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1831 | /* FB netdevice is special: we have one, and only one per netns. |
1832 | * Allowing to move it to another netns is clearly unsafe. | |
1833 | */ | |
1834 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1835 | |
e5d08d71 IM |
1836 | err = register_netdev(sitn->fb_tunnel_dev); |
1837 | if (err) | |
cd3dbc19 PE |
1838 | goto err_reg_dev; |
1839 | ||
4ece9009 ED |
1840 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
1841 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1842 | ||
72b36015 TF |
1843 | t = netdev_priv(sitn->fb_tunnel_dev); |
1844 | ||
1845 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1846 | return 0; |
1847 | ||
cd3dbc19 | 1848 | err_reg_dev: |
dd4080ee | 1849 | ipip6_dev_free(sitn->fb_tunnel_dev); |
cd3dbc19 | 1850 | err_alloc_dev: |
8190d900 PE |
1851 | return err; |
1852 | } | |
1853 | ||
2c8c1e72 | 1854 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1855 | { |
62808f91 | 1856 | LIST_HEAD(list); |
8190d900 | 1857 | |
cd3dbc19 | 1858 | rtnl_lock(); |
9434266f | 1859 | sit_destroy_tunnels(net, &list); |
62808f91 | 1860 | unregister_netdevice_many(&list); |
cd3dbc19 | 1861 | rtnl_unlock(); |
8190d900 PE |
1862 | } |
1863 | ||
1864 | static struct pernet_operations sit_net_ops = { | |
1865 | .init = sit_init_net, | |
1866 | .exit = sit_exit_net, | |
67101172 EB |
1867 | .id = &sit_net_id, |
1868 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1869 | }; |
1870 | ||
89c89458 | 1871 | static void __exit sit_cleanup(void) |
1da177e4 | 1872 | { |
ba3e3f50 | 1873 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1874 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1875 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
49dbe7ae SH |
1876 | #if IS_ENABLED(CONFIG_MPLS) |
1877 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1878 | #endif | |
db44575f | 1879 | |
67101172 | 1880 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1881 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1882 | } |
1883 | ||
89c89458 | 1884 | static int __init sit_init(void) |
1da177e4 LT |
1885 | { |
1886 | int err; | |
1887 | ||
49dbe7ae | 1888 | pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 1889 | |
67101172 | 1890 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1891 | if (err < 0) |
d5aa407f AD |
1892 | return err; |
1893 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1894 | if (err < 0) { | |
32b8a8e5 | 1895 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1896 | goto xfrm_tunnel_failed; |
d5aa407f | 1897 | } |
32b8a8e5 ND |
1898 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1899 | if (err < 0) { | |
1900 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1901 | goto xfrm_tunnel4_failed; | |
1902 | } | |
49dbe7ae SH |
1903 | #if IS_ENABLED(CONFIG_MPLS) |
1904 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
1905 | if (err < 0) { | |
1906 | pr_info("%s: can't register mplsip\n", __func__); | |
1907 | goto xfrm_tunnel_mpls_failed; | |
1908 | } | |
1909 | #endif | |
ba3e3f50 ND |
1910 | err = rtnl_link_register(&sit_link_ops); |
1911 | if (err < 0) | |
1912 | goto rtnl_link_failed; | |
1913 | ||
1914 | out: | |
1da177e4 | 1915 | return err; |
ba3e3f50 ND |
1916 | |
1917 | rtnl_link_failed: | |
49dbe7ae SH |
1918 | #if IS_ENABLED(CONFIG_MPLS) |
1919 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1920 | xfrm_tunnel_mpls_failed: | |
1921 | #endif | |
32b8a8e5 ND |
1922 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
1923 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
1924 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1925 | xfrm_tunnel_failed: | |
1926 | unregister_pernet_device(&sit_net_ops); | |
1927 | goto out; | |
1da177e4 | 1928 | } |
989e5b96 JR |
1929 | |
1930 | module_init(sit_init); | |
1931 | module_exit(sit_cleanup); | |
39c85086 | 1932 | MODULE_LICENSE("GPL"); |
f98f89a0 | 1933 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 1934 | MODULE_ALIAS_NETDEV("sit0"); |