Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
e905a9ed | 2 | * Linux NET3: IP/IP protocol decoder. |
1da177e4 | 3 | * |
1da177e4 LT |
4 | * Authors: |
5 | * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
6 | * | |
7 | * Fixes: | |
8 | * Alan Cox : Merged and made usable non modular (its so tiny its silly as | |
9 | * a module taking up 2 pages). | |
10 | * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) | |
11 | * to keep ip_forward happy. | |
12 | * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). | |
13 | * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL | |
14 | * David Woodhouse : Perform some basic ICMP handling. | |
15 | * IPIP Routing without decapsulation. | |
16 | * Carlos Picoto : GRE over IP support | |
17 | * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. | |
18 | * I do not want to merge them together. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | * | |
25 | */ | |
26 | ||
27 | /* tunnel.c: an IP tunnel driver | |
28 | ||
29 | The purpose of this driver is to provide an IP tunnel through | |
30 | which you can tunnel network traffic transparently across subnets. | |
31 | ||
32 | This was written by looking at Nick Holloway's dummy driver | |
33 | Thanks for the great code! | |
34 | ||
35 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
e905a9ed | 36 | |
1da177e4 LT |
37 | Minor tweaks: |
38 | Cleaned up the code a little and added some pre-1.3.0 tweaks. | |
39 | dev->hard_header/hard_header_len changed to use no headers. | |
40 | Comments/bracketing tweaked. | |
41 | Made the tunnels use dev->name not tunnel: when error reporting. | |
42 | Added tx_dropped stat | |
e905a9ed | 43 | |
113aa838 | 44 | -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 |
1da177e4 LT |
45 | |
46 | Reworked: | |
47 | Changed to tunnel to destination gateway in addition to the | |
48 | tunnel's pointopoint address | |
49 | Almost completely rewritten | |
50 | Note: There is currently no firewall or ICMP handling done. | |
51 | ||
52 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 | |
e905a9ed | 53 | |
1da177e4 LT |
54 | */ |
55 | ||
56 | /* Things I wish I had known when writing the tunnel driver: | |
57 | ||
58 | When the tunnel_xmit() function is called, the skb contains the | |
59 | packet to be sent (plus a great deal of extra info), and dev | |
60 | contains the tunnel device that _we_ are. | |
61 | ||
62 | When we are passed a packet, we are expected to fill in the | |
63 | source address with our source IP address. | |
64 | ||
65 | What is the proper way to allocate, copy and free a buffer? | |
66 | After you allocate it, it is a "0 length" chunk of memory | |
67 | starting at zero. If you want to add headers to the buffer | |
68 | later, you'll have to call "skb_reserve(skb, amount)" with | |
69 | the amount of memory you want reserved. Then, you call | |
70 | "skb_put(skb, amount)" with the amount of space you want in | |
71 | the buffer. skb_put() returns a pointer to the top (#0) of | |
72 | that buffer. skb->len is set to the amount of space you have | |
73 | "allocated" with skb_put(). You can then write up to skb->len | |
74 | bytes to that buffer. If you need more, you can call skb_put() | |
75 | again with the additional amount of space you need. You can | |
e905a9ed | 76 | find out how much more space you can allocate by calling |
1da177e4 LT |
77 | "skb_tailroom(skb)". |
78 | Now, to add header space, call "skb_push(skb, header_len)". | |
79 | This creates space at the beginning of the buffer and returns | |
80 | a pointer to this new space. If later you need to strip a | |
81 | header from a buffer, call "skb_pull(skb, header_len)". | |
82 | skb_headroom() will return how much space is left at the top | |
83 | of the buffer (before the main data). Remember, this headroom | |
84 | space must be reserved before the skb_put() function is called. | |
85 | */ | |
86 | ||
87 | /* | |
88 | This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c | |
89 | ||
90 | For comments look at net/ipv4/ip_gre.c --ANK | |
91 | */ | |
92 | ||
e905a9ed | 93 | |
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 LT |
95 | #include <linux/module.h> |
96 | #include <linux/types.h> | |
1da177e4 | 97 | #include <linux/kernel.h> |
5a0e3ad6 | 98 | #include <linux/slab.h> |
1da177e4 LT |
99 | #include <asm/uaccess.h> |
100 | #include <linux/skbuff.h> | |
101 | #include <linux/netdevice.h> | |
102 | #include <linux/in.h> | |
103 | #include <linux/tcp.h> | |
104 | #include <linux/udp.h> | |
105 | #include <linux/if_arp.h> | |
106 | #include <linux/mroute.h> | |
107 | #include <linux/init.h> | |
108 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 109 | #include <linux/if_ether.h> |
1da177e4 LT |
110 | |
111 | #include <net/sock.h> | |
112 | #include <net/ip.h> | |
113 | #include <net/icmp.h> | |
1da177e4 LT |
114 | #include <net/ipip.h> |
115 | #include <net/inet_ecn.h> | |
116 | #include <net/xfrm.h> | |
10dc4c7b PE |
117 | #include <net/net_namespace.h> |
118 | #include <net/netns/generic.h> | |
1da177e4 LT |
119 | |
120 | #define HASH_SIZE 16 | |
d5a0a1e3 | 121 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 122 | |
eccc1bb8 | 123 | static bool log_ecn_error = true; |
124 | module_param(log_ecn_error, bool, 0644); | |
125 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
126 | ||
f99189b1 | 127 | static int ipip_net_id __read_mostly; |
10dc4c7b | 128 | struct ipip_net { |
b7285b79 ED |
129 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
130 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
131 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
132 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
133 | struct ip_tunnel __rcu **tunnels[4]; | |
44d3c299 | 134 | |
b9855c54 | 135 | struct net_device *fb_tunnel_dev; |
10dc4c7b PE |
136 | }; |
137 | ||
3c97af99 | 138 | static int ipip_tunnel_init(struct net_device *dev); |
1da177e4 | 139 | static void ipip_tunnel_setup(struct net_device *dev); |
3c97af99 | 140 | static void ipip_dev_free(struct net_device *dev); |
0974658d | 141 | static struct rtnl_link_ops ipip_link_ops __read_mostly; |
1da177e4 | 142 | |
87b6d218 | 143 | static struct rtnl_link_stats64 *ipip_get_stats64(struct net_device *dev, |
144 | struct rtnl_link_stats64 *tot) | |
3c97af99 | 145 | { |
3c97af99 ED |
146 | int i; |
147 | ||
148 | for_each_possible_cpu(i) { | |
149 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 150 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
151 | unsigned int start; | |
152 | ||
153 | do { | |
154 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
155 | rx_packets = tstats->rx_packets; | |
156 | tx_packets = tstats->tx_packets; | |
157 | rx_bytes = tstats->rx_bytes; | |
158 | tx_bytes = tstats->tx_bytes; | |
159 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
160 | ||
161 | tot->rx_packets += rx_packets; | |
162 | tot->tx_packets += tx_packets; | |
163 | tot->rx_bytes += rx_bytes; | |
164 | tot->tx_bytes += tx_bytes; | |
3c97af99 | 165 | } |
87b6d218 | 166 | |
167 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
168 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
169 | tot->tx_dropped = dev->stats.tx_dropped; | |
170 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
171 | tot->tx_errors = dev->stats.tx_errors; | |
172 | tot->collisions = dev->stats.collisions; | |
173 | ||
174 | return tot; | |
3c97af99 ED |
175 | } |
176 | ||
5e73ea1a | 177 | static struct ip_tunnel *ipip_tunnel_lookup(struct net *net, |
b9fae5c9 | 178 | __be32 remote, __be32 local) |
1da177e4 | 179 | { |
b7285b79 ED |
180 | unsigned int h0 = HASH(remote); |
181 | unsigned int h1 = HASH(local); | |
1da177e4 | 182 | struct ip_tunnel *t; |
44d3c299 | 183 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 184 | |
e086cadc | 185 | for_each_ip_tunnel_rcu(t, ipn->tunnels_r_l[h0 ^ h1]) |
1da177e4 LT |
186 | if (local == t->parms.iph.saddr && |
187 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
188 | return t; | |
8f95dd63 | 189 | |
e086cadc | 190 | for_each_ip_tunnel_rcu(t, ipn->tunnels_r[h0]) |
1da177e4 LT |
191 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
192 | return t; | |
8f95dd63 | 193 | |
e086cadc | 194 | for_each_ip_tunnel_rcu(t, ipn->tunnels_l[h1]) |
1da177e4 LT |
195 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
196 | return t; | |
8f95dd63 ED |
197 | |
198 | t = rcu_dereference(ipn->tunnels_wc[0]); | |
199 | if (t && (t->dev->flags&IFF_UP)) | |
1da177e4 LT |
200 | return t; |
201 | return NULL; | |
202 | } | |
203 | ||
b7285b79 | 204 | static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 205 | struct ip_tunnel_parm *parms) |
1da177e4 | 206 | { |
87d1a164 YH |
207 | __be32 remote = parms->iph.daddr; |
208 | __be32 local = parms->iph.saddr; | |
b7285b79 | 209 | unsigned int h = 0; |
1da177e4 LT |
210 | int prio = 0; |
211 | ||
212 | if (remote) { | |
213 | prio |= 2; | |
214 | h ^= HASH(remote); | |
215 | } | |
216 | if (local) { | |
217 | prio |= 1; | |
218 | h ^= HASH(local); | |
219 | } | |
44d3c299 | 220 | return &ipn->tunnels[prio][h]; |
1da177e4 LT |
221 | } |
222 | ||
b7285b79 | 223 | static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 224 | struct ip_tunnel *t) |
87d1a164 | 225 | { |
b9fae5c9 | 226 | return __ipip_bucket(ipn, &t->parms); |
87d1a164 | 227 | } |
1da177e4 | 228 | |
b9fae5c9 | 229 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 230 | { |
b7285b79 ED |
231 | struct ip_tunnel __rcu **tp; |
232 | struct ip_tunnel *iter; | |
233 | ||
234 | for (tp = ipip_bucket(ipn, t); | |
235 | (iter = rtnl_dereference(*tp)) != NULL; | |
236 | tp = &iter->next) { | |
237 | if (t == iter) { | |
cf778b00 | 238 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
239 | break; |
240 | } | |
241 | } | |
242 | } | |
243 | ||
b9fae5c9 | 244 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 245 | { |
b7285b79 | 246 | struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); |
1da177e4 | 247 | |
cf778b00 ED |
248 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
249 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
250 | } |
251 | ||
be42da0e ND |
252 | static int ipip_tunnel_create(struct net_device *dev) |
253 | { | |
254 | struct ip_tunnel *t = netdev_priv(dev); | |
255 | struct net *net = dev_net(dev); | |
256 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
257 | int err; | |
258 | ||
259 | err = ipip_tunnel_init(dev); | |
260 | if (err < 0) | |
261 | goto out; | |
262 | ||
263 | err = register_netdevice(dev); | |
264 | if (err < 0) | |
265 | goto out; | |
266 | ||
267 | strcpy(t->parms.name, dev->name); | |
268 | dev->rtnl_link_ops = &ipip_link_ops; | |
269 | ||
270 | dev_hold(dev); | |
271 | ipip_tunnel_link(ipn, t); | |
272 | return 0; | |
273 | ||
274 | out: | |
275 | return err; | |
276 | } | |
277 | ||
5e73ea1a | 278 | static struct ip_tunnel *ipip_tunnel_locate(struct net *net, |
b9fae5c9 | 279 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 280 | { |
d5a0a1e3 AV |
281 | __be32 remote = parms->iph.daddr; |
282 | __be32 local = parms->iph.saddr; | |
b7285b79 ED |
283 | struct ip_tunnel *t, *nt; |
284 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 285 | struct net_device *dev; |
1da177e4 | 286 | char name[IFNAMSIZ]; |
b9fae5c9 | 287 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 288 | |
b7285b79 ED |
289 | for (tp = __ipip_bucket(ipn, parms); |
290 | (t = rtnl_dereference(*tp)) != NULL; | |
291 | tp = &t->next) { | |
1da177e4 LT |
292 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
293 | return t; | |
294 | } | |
295 | if (!create) | |
296 | return NULL; | |
297 | ||
298 | if (parms->name[0]) | |
299 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 300 | else |
3c97af99 | 301 | strcpy(name, "tunl%d"); |
1da177e4 LT |
302 | |
303 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
304 | if (dev == NULL) | |
305 | return NULL; | |
306 | ||
0a826406 PE |
307 | dev_net_set(dev, net); |
308 | ||
2941a486 | 309 | nt = netdev_priv(dev); |
1da177e4 LT |
310 | nt->parms = *parms; |
311 | ||
be42da0e | 312 | if (ipip_tunnel_create(dev) < 0) |
3c97af99 | 313 | goto failed_free; |
23a12b14 | 314 | |
1da177e4 LT |
315 | return nt; |
316 | ||
b37d428b | 317 | failed_free: |
3c97af99 | 318 | ipip_dev_free(dev); |
1da177e4 LT |
319 | return NULL; |
320 | } | |
321 | ||
b7285b79 | 322 | /* called with RTNL */ |
1da177e4 LT |
323 | static void ipip_tunnel_uninit(struct net_device *dev) |
324 | { | |
b9855c54 PE |
325 | struct net *net = dev_net(dev); |
326 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
327 | ||
b7285b79 | 328 | if (dev == ipn->fb_tunnel_dev) |
a9b3cd7f | 329 | RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL); |
b7285b79 | 330 | else |
b9fae5c9 | 331 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
1da177e4 LT |
332 | dev_put(dev); |
333 | } | |
334 | ||
d2acc347 | 335 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 336 | { |
1da177e4 | 337 | |
071f92d0 | 338 | /* All the routers (except for Linux) return only |
1da177e4 LT |
339 | 8 bytes of packet payload. It means, that precise relaying of |
340 | ICMP in the real Internet is absolutely infeasible. | |
341 | */ | |
b71d1d42 | 342 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
343 | const int type = icmp_hdr(skb)->type; |
344 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 345 | struct ip_tunnel *t; |
d2acc347 | 346 | int err; |
1da177e4 LT |
347 | |
348 | switch (type) { | |
349 | default: | |
350 | case ICMP_PARAMETERPROB: | |
d2acc347 | 351 | return 0; |
1da177e4 LT |
352 | |
353 | case ICMP_DEST_UNREACH: | |
354 | switch (code) { | |
355 | case ICMP_SR_FAILED: | |
356 | case ICMP_PORT_UNREACH: | |
357 | /* Impossible event. */ | |
d2acc347 | 358 | return 0; |
1da177e4 LT |
359 | default: |
360 | /* All others are translated to HOST_UNREACH. | |
361 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
362 | I believe they are just ether pollution. --ANK | |
363 | */ | |
364 | break; | |
365 | } | |
366 | break; | |
367 | case ICMP_TIME_EXCEEDED: | |
368 | if (code != ICMP_EXC_TTL) | |
d2acc347 | 369 | return 0; |
1da177e4 | 370 | break; |
55be7a9c DM |
371 | case ICMP_REDIRECT: |
372 | break; | |
1da177e4 LT |
373 | } |
374 | ||
d2acc347 | 375 | err = -ENOENT; |
cec3ffae | 376 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
36393395 DM |
377 | if (t == NULL) |
378 | goto out; | |
379 | ||
380 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
381 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
382 | t->dev->ifindex, 0, IPPROTO_IPIP, 0); | |
383 | err = 0; | |
384 | goto out; | |
385 | } | |
386 | ||
55be7a9c DM |
387 | if (type == ICMP_REDIRECT) { |
388 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
389 | IPPROTO_IPIP, 0); | |
390 | err = 0; | |
391 | goto out; | |
392 | } | |
393 | ||
36393395 | 394 | if (t->parms.iph.daddr == 0) |
1da177e4 | 395 | goto out; |
d2acc347 HX |
396 | |
397 | err = 0; | |
1da177e4 LT |
398 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
399 | goto out; | |
400 | ||
26d94b46 | 401 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
402 | t->err_count++; |
403 | else | |
404 | t->err_count = 1; | |
405 | t->err_time = jiffies; | |
406 | out: | |
b0558ef2 | 407 | |
d2acc347 | 408 | return err; |
1da177e4 LT |
409 | } |
410 | ||
1da177e4 LT |
411 | static int ipip_rcv(struct sk_buff *skb) |
412 | { | |
1da177e4 | 413 | struct ip_tunnel *tunnel; |
eddc9ec5 | 414 | const struct iphdr *iph = ip_hdr(skb); |
eccc1bb8 | 415 | int err; |
1da177e4 | 416 | |
3c97af99 ED |
417 | tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); |
418 | if (tunnel != NULL) { | |
419 | struct pcpu_tstats *tstats; | |
420 | ||
eccc1bb8 | 421 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
422 | goto drop; | |
1da177e4 LT |
423 | |
424 | secpath_reset(skb); | |
425 | ||
b0e380b1 | 426 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 427 | skb_reset_network_header(skb); |
1da177e4 LT |
428 | skb->protocol = htons(ETH_P_IP); |
429 | skb->pkt_type = PACKET_HOST; | |
430 | ||
eccc1bb8 | 431 | __skb_tunnel_rx(skb, tunnel->dev); |
432 | ||
433 | err = IP_ECN_decapsulate(iph, skb); | |
434 | if (unlikely(err)) { | |
435 | if (log_ecn_error) | |
436 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
437 | &iph->saddr, iph->tos); | |
438 | if (err > 1) { | |
439 | ++tunnel->dev->stats.rx_frame_errors; | |
440 | ++tunnel->dev->stats.rx_errors; | |
441 | goto drop; | |
442 | } | |
443 | } | |
444 | ||
3c97af99 | 445 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
87b6d218 | 446 | u64_stats_update_begin(&tstats->syncp); |
3c97af99 ED |
447 | tstats->rx_packets++; |
448 | tstats->rx_bytes += skb->len; | |
87b6d218 | 449 | u64_stats_update_end(&tstats->syncp); |
3c97af99 | 450 | |
caf586e5 | 451 | netif_rx(skb); |
1da177e4 LT |
452 | return 0; |
453 | } | |
1da177e4 | 454 | |
1da177e4 | 455 | return -1; |
eccc1bb8 | 456 | |
457 | drop: | |
458 | kfree_skb(skb); | |
459 | return 0; | |
1da177e4 LT |
460 | } |
461 | ||
462 | /* | |
463 | * This function assumes it is being called from dev_queue_xmit() | |
464 | * and that skb is filled properly by that function. | |
465 | */ | |
466 | ||
6fef4c0c | 467 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 468 | { |
2941a486 | 469 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 | 470 | const struct iphdr *tiph = &tunnel->parms.iph; |
1da177e4 | 471 | u8 tos = tunnel->parms.iph.tos; |
d5a0a1e3 | 472 | __be16 df = tiph->frag_off; |
1da177e4 | 473 | struct rtable *rt; /* Route to the other host */ |
3c97af99 | 474 | struct net_device *tdev; /* Device to other host */ |
cef401de | 475 | const struct iphdr *old_iph; |
1da177e4 | 476 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 477 | unsigned int max_headroom; /* The extra header space needed */ |
d5a0a1e3 | 478 | __be32 dst = tiph->daddr; |
31e4543d | 479 | struct flowi4 fl4; |
1da177e4 LT |
480 | int mtu; |
481 | ||
1da177e4 LT |
482 | if (skb->protocol != htons(ETH_P_IP)) |
483 | goto tx_error; | |
484 | ||
c3b89fbb ED |
485 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
486 | skb_checksum_help(skb)) | |
487 | goto tx_error; | |
488 | ||
cef401de ED |
489 | old_iph = ip_hdr(skb); |
490 | ||
3c97af99 | 491 | if (tos & 1) |
1da177e4 LT |
492 | tos = old_iph->tos; |
493 | ||
494 | if (!dst) { | |
495 | /* NBMA tunnel */ | |
511c3f92 | 496 | if ((rt = skb_rtable(skb)) == NULL) { |
3c97af99 | 497 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
498 | goto tx_error; |
499 | } | |
f8126f1d | 500 | dst = rt_nexthop(rt, old_iph->daddr); |
1da177e4 LT |
501 | } |
502 | ||
31e4543d | 503 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
504 | dst, tiph->saddr, |
505 | 0, 0, | |
506 | IPPROTO_IPIP, RT_TOS(tos), | |
507 | tunnel->parms.link); | |
508 | if (IS_ERR(rt)) { | |
509 | dev->stats.tx_carrier_errors++; | |
510 | goto tx_error_icmp; | |
1da177e4 | 511 | } |
d8d1f30b | 512 | tdev = rt->dst.dev; |
1da177e4 LT |
513 | |
514 | if (tdev == dev) { | |
515 | ip_rt_put(rt); | |
3c97af99 | 516 | dev->stats.collisions++; |
1da177e4 LT |
517 | goto tx_error; |
518 | } | |
519 | ||
23ca0c98 HX |
520 | df |= old_iph->frag_off & htons(IP_DF); |
521 | ||
522 | if (df) { | |
d8d1f30b | 523 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 524 | |
23ca0c98 | 525 | if (mtu < 68) { |
3c97af99 | 526 | dev->stats.collisions++; |
23ca0c98 HX |
527 | ip_rt_put(rt); |
528 | goto tx_error; | |
529 | } | |
1da177e4 | 530 | |
23ca0c98 | 531 | if (skb_dst(skb)) |
6700c270 | 532 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 533 | |
23ca0c98 HX |
534 | if ((old_iph->frag_off & htons(IP_DF)) && |
535 | mtu < ntohs(old_iph->tot_len)) { | |
536 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
537 | htonl(mtu)); | |
538 | ip_rt_put(rt); | |
539 | goto tx_error; | |
540 | } | |
1da177e4 LT |
541 | } |
542 | ||
543 | if (tunnel->err_count > 0) { | |
26d94b46 WY |
544 | if (time_before(jiffies, |
545 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
546 | tunnel->err_count--; |
547 | dst_link_failure(skb); | |
548 | } else | |
549 | tunnel->err_count = 0; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Okay, now see if we can stuff it in the buffer as-is. | |
554 | */ | |
555 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
556 | ||
cfbba49d PM |
557 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
558 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
559 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
560 | if (!new_skb) { | |
561 | ip_rt_put(rt); | |
3c97af99 | 562 | dev->stats.tx_dropped++; |
1da177e4 | 563 | dev_kfree_skb(skb); |
6ed10654 | 564 | return NETDEV_TX_OK; |
1da177e4 LT |
565 | } |
566 | if (skb->sk) | |
567 | skb_set_owner_w(new_skb, skb->sk); | |
568 | dev_kfree_skb(skb); | |
569 | skb = new_skb; | |
eddc9ec5 | 570 | old_iph = ip_hdr(skb); |
1da177e4 LT |
571 | } |
572 | ||
b0e380b1 | 573 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
574 | skb_push(skb, sizeof(struct iphdr)); |
575 | skb_reset_network_header(skb); | |
1da177e4 | 576 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
577 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
578 | IPSKB_REROUTED); | |
adf30907 | 579 | skb_dst_drop(skb); |
d8d1f30b | 580 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
581 | |
582 | /* | |
583 | * Push down and install the IPIP header. | |
584 | */ | |
585 | ||
eddc9ec5 | 586 | iph = ip_hdr(skb); |
1da177e4 LT |
587 | iph->version = 4; |
588 | iph->ihl = sizeof(struct iphdr)>>2; | |
589 | iph->frag_off = df; | |
590 | iph->protocol = IPPROTO_IPIP; | |
591 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
69458cb1 DM |
592 | iph->daddr = fl4.daddr; |
593 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
594 | |
595 | if ((iph->ttl = tiph->ttl) == 0) | |
596 | iph->ttl = old_iph->ttl; | |
597 | ||
aa0010f8 | 598 | iptunnel_xmit(skb, dev); |
6ed10654 | 599 | return NETDEV_TX_OK; |
1da177e4 LT |
600 | |
601 | tx_error_icmp: | |
602 | dst_link_failure(skb); | |
603 | tx_error: | |
3c97af99 | 604 | dev->stats.tx_errors++; |
1da177e4 | 605 | dev_kfree_skb(skb); |
6ed10654 | 606 | return NETDEV_TX_OK; |
1da177e4 LT |
607 | } |
608 | ||
5533995b MS |
609 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
610 | { | |
611 | struct net_device *tdev = NULL; | |
612 | struct ip_tunnel *tunnel; | |
b71d1d42 | 613 | const struct iphdr *iph; |
5533995b MS |
614 | |
615 | tunnel = netdev_priv(dev); | |
616 | iph = &tunnel->parms.iph; | |
617 | ||
618 | if (iph->daddr) { | |
31e4543d DM |
619 | struct rtable *rt; |
620 | struct flowi4 fl4; | |
621 | ||
622 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
623 | iph->daddr, iph->saddr, | |
624 | 0, 0, | |
625 | IPPROTO_IPIP, | |
626 | RT_TOS(iph->tos), | |
627 | tunnel->parms.link); | |
b23dd4fe | 628 | if (!IS_ERR(rt)) { |
d8d1f30b | 629 | tdev = rt->dst.dev; |
5533995b MS |
630 | ip_rt_put(rt); |
631 | } | |
632 | dev->flags |= IFF_POINTOPOINT; | |
633 | } | |
634 | ||
635 | if (!tdev && tunnel->parms.link) | |
b99f0152 | 636 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
5533995b MS |
637 | |
638 | if (tdev) { | |
639 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
640 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
641 | } | |
642 | dev->iflink = tunnel->parms.link; | |
643 | } | |
644 | ||
be42da0e ND |
645 | static void ipip_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) |
646 | { | |
647 | struct net *net = dev_net(t->dev); | |
648 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
649 | ||
650 | ipip_tunnel_unlink(ipn, t); | |
651 | synchronize_net(); | |
652 | t->parms.iph.saddr = p->iph.saddr; | |
653 | t->parms.iph.daddr = p->iph.daddr; | |
654 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
655 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
656 | ipip_tunnel_link(ipn, t); | |
657 | t->parms.iph.ttl = p->iph.ttl; | |
658 | t->parms.iph.tos = p->iph.tos; | |
659 | t->parms.iph.frag_off = p->iph.frag_off; | |
660 | if (t->parms.link != p->link) { | |
661 | t->parms.link = p->link; | |
662 | ipip_tunnel_bind_dev(t->dev); | |
663 | } | |
664 | netdev_state_change(t->dev); | |
665 | } | |
666 | ||
1da177e4 LT |
667 | static int |
668 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
669 | { | |
670 | int err = 0; | |
671 | struct ip_tunnel_parm p; | |
672 | struct ip_tunnel *t; | |
b9855c54 PE |
673 | struct net *net = dev_net(dev); |
674 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
1da177e4 LT |
675 | |
676 | switch (cmd) { | |
677 | case SIOCGETTUNNEL: | |
678 | t = NULL; | |
b9855c54 | 679 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
680 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
681 | err = -EFAULT; | |
682 | break; | |
683 | } | |
b9fae5c9 | 684 | t = ipip_tunnel_locate(net, &p, 0); |
1da177e4 LT |
685 | } |
686 | if (t == NULL) | |
2941a486 | 687 | t = netdev_priv(dev); |
1da177e4 LT |
688 | memcpy(&p, &t->parms, sizeof(p)); |
689 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
690 | err = -EFAULT; | |
691 | break; | |
692 | ||
693 | case SIOCADDTUNNEL: | |
694 | case SIOCCHGTUNNEL: | |
695 | err = -EPERM; | |
52e804c6 | 696 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
697 | goto done; |
698 | ||
699 | err = -EFAULT; | |
700 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
701 | goto done; | |
702 | ||
703 | err = -EINVAL; | |
704 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || | |
705 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
706 | goto done; | |
707 | if (p.iph.ttl) | |
708 | p.iph.frag_off |= htons(IP_DF); | |
709 | ||
b9fae5c9 | 710 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 711 | |
b9855c54 | 712 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
713 | if (t != NULL) { |
714 | if (t->dev != dev) { | |
715 | err = -EEXIST; | |
716 | break; | |
717 | } | |
718 | } else { | |
719 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
720 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
721 | err = -EINVAL; | |
722 | break; | |
723 | } | |
2941a486 | 724 | t = netdev_priv(dev); |
1da177e4 | 725 | } |
c38cc4b5 | 726 | |
be42da0e | 727 | ipip_tunnel_update(t, &p); |
1da177e4 LT |
728 | } |
729 | ||
730 | if (t) { | |
731 | err = 0; | |
1da177e4 LT |
732 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
733 | err = -EFAULT; | |
734 | } else | |
735 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
736 | break; | |
737 | ||
738 | case SIOCDELTUNNEL: | |
739 | err = -EPERM; | |
52e804c6 | 740 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
741 | goto done; |
742 | ||
b9855c54 | 743 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
744 | err = -EFAULT; |
745 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
746 | goto done; | |
747 | err = -ENOENT; | |
b9fae5c9 | 748 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
749 | goto done; |
750 | err = -EPERM; | |
b9855c54 | 751 | if (t->dev == ipn->fb_tunnel_dev) |
1da177e4 LT |
752 | goto done; |
753 | dev = t->dev; | |
754 | } | |
22f8cde5 SH |
755 | unregister_netdevice(dev); |
756 | err = 0; | |
1da177e4 LT |
757 | break; |
758 | ||
759 | default: | |
760 | err = -EINVAL; | |
761 | } | |
762 | ||
763 | done: | |
764 | return err; | |
765 | } | |
766 | ||
1da177e4 LT |
767 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
768 | { | |
769 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
770 | return -EINVAL; | |
771 | dev->mtu = new_mtu; | |
772 | return 0; | |
773 | } | |
774 | ||
23a12b14 SH |
775 | static const struct net_device_ops ipip_netdev_ops = { |
776 | .ndo_uninit = ipip_tunnel_uninit, | |
777 | .ndo_start_xmit = ipip_tunnel_xmit, | |
778 | .ndo_do_ioctl = ipip_tunnel_ioctl, | |
779 | .ndo_change_mtu = ipip_tunnel_change_mtu, | |
87b6d218 | 780 | .ndo_get_stats64 = ipip_get_stats64, |
23a12b14 SH |
781 | }; |
782 | ||
3c97af99 ED |
783 | static void ipip_dev_free(struct net_device *dev) |
784 | { | |
785 | free_percpu(dev->tstats); | |
786 | free_netdev(dev); | |
787 | } | |
788 | ||
c3b89fbb ED |
789 | #define IPIP_FEATURES (NETIF_F_SG | \ |
790 | NETIF_F_FRAGLIST | \ | |
791 | NETIF_F_HIGHDMA | \ | |
792 | NETIF_F_HW_CSUM) | |
793 | ||
1da177e4 LT |
794 | static void ipip_tunnel_setup(struct net_device *dev) |
795 | { | |
23a12b14 | 796 | dev->netdev_ops = &ipip_netdev_ops; |
3c97af99 | 797 | dev->destructor = ipip_dev_free; |
1da177e4 LT |
798 | |
799 | dev->type = ARPHRD_TUNNEL; | |
800 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 801 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
802 | dev->flags = IFF_NOARP; |
803 | dev->iflink = 0; | |
804 | dev->addr_len = 4; | |
0a826406 | 805 | dev->features |= NETIF_F_NETNS_LOCAL; |
153f0943 | 806 | dev->features |= NETIF_F_LLTX; |
28e72216 | 807 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
c3b89fbb ED |
808 | |
809 | dev->features |= IPIP_FEATURES; | |
810 | dev->hw_features |= IPIP_FEATURES; | |
1da177e4 LT |
811 | } |
812 | ||
3c97af99 | 813 | static int ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 814 | { |
23a12b14 | 815 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
816 | |
817 | tunnel->dev = dev; | |
1da177e4 LT |
818 | |
819 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
820 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
821 | ||
5533995b | 822 | ipip_tunnel_bind_dev(dev); |
3c97af99 ED |
823 | |
824 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
825 | if (!dev->tstats) | |
826 | return -ENOMEM; | |
827 | ||
828 | return 0; | |
1da177e4 LT |
829 | } |
830 | ||
fada5636 | 831 | static int __net_init ipip_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 832 | { |
2941a486 | 833 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 834 | struct iphdr *iph = &tunnel->parms.iph; |
44d3c299 | 835 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
1da177e4 LT |
836 | |
837 | tunnel->dev = dev; | |
838 | strcpy(tunnel->parms.name, dev->name); | |
839 | ||
840 | iph->version = 4; | |
841 | iph->protocol = IPPROTO_IPIP; | |
842 | iph->ihl = 5; | |
843 | ||
fada5636 ED |
844 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
845 | if (!dev->tstats) | |
846 | return -ENOMEM; | |
847 | ||
1da177e4 | 848 | dev_hold(dev); |
cf778b00 | 849 | rcu_assign_pointer(ipn->tunnels_wc[0], tunnel); |
fada5636 | 850 | return 0; |
1da177e4 LT |
851 | } |
852 | ||
be42da0e ND |
853 | static void ipip_netlink_parms(struct nlattr *data[], |
854 | struct ip_tunnel_parm *parms) | |
855 | { | |
856 | memset(parms, 0, sizeof(*parms)); | |
857 | ||
858 | parms->iph.version = 4; | |
859 | parms->iph.protocol = IPPROTO_IPIP; | |
860 | parms->iph.ihl = 5; | |
861 | ||
862 | if (!data) | |
863 | return; | |
864 | ||
865 | if (data[IFLA_IPTUN_LINK]) | |
866 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
867 | ||
868 | if (data[IFLA_IPTUN_LOCAL]) | |
fea379b2 | 869 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
be42da0e ND |
870 | |
871 | if (data[IFLA_IPTUN_REMOTE]) | |
fea379b2 | 872 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
be42da0e ND |
873 | |
874 | if (data[IFLA_IPTUN_TTL]) { | |
875 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
876 | if (parms->iph.ttl) | |
877 | parms->iph.frag_off = htons(IP_DF); | |
878 | } | |
879 | ||
880 | if (data[IFLA_IPTUN_TOS]) | |
881 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
882 | ||
883 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
884 | parms->iph.frag_off = htons(IP_DF); | |
885 | } | |
886 | ||
887 | static int ipip_newlink(struct net *src_net, struct net_device *dev, | |
888 | struct nlattr *tb[], struct nlattr *data[]) | |
889 | { | |
890 | struct net *net = dev_net(dev); | |
891 | struct ip_tunnel *nt; | |
892 | ||
893 | nt = netdev_priv(dev); | |
894 | ipip_netlink_parms(data, &nt->parms); | |
895 | ||
896 | if (ipip_tunnel_locate(net, &nt->parms, 0)) | |
897 | return -EEXIST; | |
898 | ||
899 | return ipip_tunnel_create(dev); | |
900 | } | |
901 | ||
902 | static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], | |
903 | struct nlattr *data[]) | |
904 | { | |
905 | struct ip_tunnel *t; | |
906 | struct ip_tunnel_parm p; | |
907 | struct net *net = dev_net(dev); | |
908 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
909 | ||
910 | if (dev == ipn->fb_tunnel_dev) | |
911 | return -EINVAL; | |
912 | ||
913 | ipip_netlink_parms(data, &p); | |
914 | ||
915 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
916 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
917 | return -EINVAL; | |
918 | ||
919 | t = ipip_tunnel_locate(net, &p, 0); | |
920 | ||
921 | if (t) { | |
922 | if (t->dev != dev) | |
923 | return -EEXIST; | |
924 | } else | |
925 | t = netdev_priv(dev); | |
926 | ||
927 | ipip_tunnel_update(t, &p); | |
928 | return 0; | |
929 | } | |
930 | ||
0974658d ND |
931 | static size_t ipip_get_size(const struct net_device *dev) |
932 | { | |
933 | return | |
934 | /* IFLA_IPTUN_LINK */ | |
935 | nla_total_size(4) + | |
936 | /* IFLA_IPTUN_LOCAL */ | |
937 | nla_total_size(4) + | |
938 | /* IFLA_IPTUN_REMOTE */ | |
939 | nla_total_size(4) + | |
940 | /* IFLA_IPTUN_TTL */ | |
941 | nla_total_size(1) + | |
942 | /* IFLA_IPTUN_TOS */ | |
943 | nla_total_size(1) + | |
befe2aa1 ND |
944 | /* IFLA_IPTUN_PMTUDISC */ |
945 | nla_total_size(1) + | |
0974658d ND |
946 | 0; |
947 | } | |
948 | ||
949 | static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
950 | { | |
951 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
952 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
953 | ||
954 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
955 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
956 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
957 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
befe2aa1 ND |
958 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
959 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
960 | !!(parm->iph.frag_off & htons(IP_DF)))) | |
0974658d ND |
961 | goto nla_put_failure; |
962 | return 0; | |
963 | ||
964 | nla_put_failure: | |
965 | return -EMSGSIZE; | |
966 | } | |
967 | ||
be42da0e ND |
968 | static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { |
969 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
970 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
971 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
972 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
973 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
974 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
975 | }; | |
976 | ||
0974658d ND |
977 | static struct rtnl_link_ops ipip_link_ops __read_mostly = { |
978 | .kind = "ipip", | |
979 | .maxtype = IFLA_IPTUN_MAX, | |
be42da0e | 980 | .policy = ipip_policy, |
0974658d | 981 | .priv_size = sizeof(struct ip_tunnel), |
be42da0e ND |
982 | .setup = ipip_tunnel_setup, |
983 | .newlink = ipip_newlink, | |
984 | .changelink = ipip_changelink, | |
0974658d ND |
985 | .get_size = ipip_get_size, |
986 | .fill_info = ipip_fill_info, | |
987 | }; | |
988 | ||
6dcd814b | 989 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1da177e4 LT |
990 | .handler = ipip_rcv, |
991 | .err_handler = ipip_err, | |
d2acc347 | 992 | .priority = 1, |
1da177e4 LT |
993 | }; |
994 | ||
5747a1aa | 995 | static const char banner[] __initconst = |
1da177e4 LT |
996 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
997 | ||
0694c4c0 | 998 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) |
44d3c299 PE |
999 | { |
1000 | int prio; | |
1001 | ||
1002 | for (prio = 1; prio < 4; prio++) { | |
1003 | int h; | |
1004 | for (h = 0; h < HASH_SIZE; h++) { | |
b7285b79 | 1005 | struct ip_tunnel *t; |
0694c4c0 | 1006 | |
b7285b79 | 1007 | t = rtnl_dereference(ipn->tunnels[prio][h]); |
0694c4c0 ED |
1008 | while (t != NULL) { |
1009 | unregister_netdevice_queue(t->dev, head); | |
b7285b79 | 1010 | t = rtnl_dereference(t->next); |
0694c4c0 | 1011 | } |
44d3c299 PE |
1012 | } |
1013 | } | |
1014 | } | |
1015 | ||
2c8c1e72 | 1016 | static int __net_init ipip_init_net(struct net *net) |
10dc4c7b | 1017 | { |
86de8a63 | 1018 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
72b36015 | 1019 | struct ip_tunnel *t; |
10dc4c7b | 1020 | int err; |
10dc4c7b | 1021 | |
44d3c299 PE |
1022 | ipn->tunnels[0] = ipn->tunnels_wc; |
1023 | ipn->tunnels[1] = ipn->tunnels_l; | |
1024 | ipn->tunnels[2] = ipn->tunnels_r; | |
1025 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
1026 | ||
b9855c54 PE |
1027 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
1028 | "tunl0", | |
1029 | ipip_tunnel_setup); | |
1030 | if (!ipn->fb_tunnel_dev) { | |
1031 | err = -ENOMEM; | |
1032 | goto err_alloc_dev; | |
1033 | } | |
be77e593 | 1034 | dev_net_set(ipn->fb_tunnel_dev, net); |
b9855c54 | 1035 | |
fada5636 ED |
1036 | err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
1037 | if (err) | |
1038 | goto err_reg_dev; | |
b9855c54 PE |
1039 | |
1040 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
1041 | goto err_reg_dev; | |
1042 | ||
72b36015 TF |
1043 | t = netdev_priv(ipn->fb_tunnel_dev); |
1044 | ||
1045 | strcpy(t->parms.name, ipn->fb_tunnel_dev->name); | |
10dc4c7b PE |
1046 | return 0; |
1047 | ||
b9855c54 | 1048 | err_reg_dev: |
fada5636 | 1049 | ipip_dev_free(ipn->fb_tunnel_dev); |
b9855c54 PE |
1050 | err_alloc_dev: |
1051 | /* nothing */ | |
10dc4c7b PE |
1052 | return err; |
1053 | } | |
1054 | ||
2c8c1e72 | 1055 | static void __net_exit ipip_exit_net(struct net *net) |
10dc4c7b | 1056 | { |
86de8a63 | 1057 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
0694c4c0 | 1058 | LIST_HEAD(list); |
10dc4c7b | 1059 | |
b9855c54 | 1060 | rtnl_lock(); |
0694c4c0 ED |
1061 | ipip_destroy_tunnels(ipn, &list); |
1062 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); | |
1063 | unregister_netdevice_many(&list); | |
b9855c54 | 1064 | rtnl_unlock(); |
10dc4c7b PE |
1065 | } |
1066 | ||
1067 | static struct pernet_operations ipip_net_ops = { | |
1068 | .init = ipip_init_net, | |
1069 | .exit = ipip_exit_net, | |
86de8a63 EB |
1070 | .id = &ipip_net_id, |
1071 | .size = sizeof(struct ipip_net), | |
10dc4c7b PE |
1072 | }; |
1073 | ||
1da177e4 LT |
1074 | static int __init ipip_init(void) |
1075 | { | |
1076 | int err; | |
1077 | ||
1078 | printk(banner); | |
1079 | ||
d5aa407f AD |
1080 | err = register_pernet_device(&ipip_net_ops); |
1081 | if (err < 0) | |
1082 | return err; | |
1083 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
1084 | if (err < 0) { | |
058bd4d2 | 1085 | pr_info("%s: can't register tunnel\n", __func__); |
0974658d | 1086 | goto xfrm_tunnel_failed; |
1da177e4 | 1087 | } |
0974658d ND |
1088 | err = rtnl_link_register(&ipip_link_ops); |
1089 | if (err < 0) | |
1090 | goto rtnl_link_failed; | |
1091 | ||
1092 | out: | |
1da177e4 | 1093 | return err; |
0974658d ND |
1094 | |
1095 | rtnl_link_failed: | |
1096 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); | |
1097 | xfrm_tunnel_failed: | |
1098 | unregister_pernet_device(&ipip_net_ops); | |
1099 | goto out; | |
1da177e4 LT |
1100 | } |
1101 | ||
1102 | static void __exit ipip_fini(void) | |
1103 | { | |
0974658d | 1104 | rtnl_link_unregister(&ipip_link_ops); |
c0d56408 | 1105 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
058bd4d2 | 1106 | pr_info("%s: can't deregister tunnel\n", __func__); |
1da177e4 | 1107 | |
86de8a63 | 1108 | unregister_pernet_device(&ipip_net_ops); |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | module_init(ipip_init); | |
1112 | module_exit(ipip_fini); | |
1113 | MODULE_LICENSE("GPL"); | |
8909c9ad | 1114 | MODULE_ALIAS_NETDEV("tunl0"); |