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 | |
f99189b1 | 123 | static int ipip_net_id __read_mostly; |
10dc4c7b | 124 | struct ipip_net { |
b7285b79 ED |
125 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
126 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
127 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
128 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
129 | struct ip_tunnel __rcu **tunnels[4]; | |
44d3c299 | 130 | |
b9855c54 | 131 | struct net_device *fb_tunnel_dev; |
10dc4c7b PE |
132 | }; |
133 | ||
3c97af99 | 134 | static int ipip_tunnel_init(struct net_device *dev); |
1da177e4 | 135 | static void ipip_tunnel_setup(struct net_device *dev); |
3c97af99 | 136 | static void ipip_dev_free(struct net_device *dev); |
1da177e4 | 137 | |
8f95dd63 | 138 | /* |
b7285b79 | 139 | * Locking : hash tables are protected by RCU and RTNL |
8f95dd63 | 140 | */ |
8f95dd63 ED |
141 | |
142 | #define for_each_ip_tunnel_rcu(start) \ | |
143 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 144 | |
3c97af99 ED |
145 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
146 | struct pcpu_tstats { | |
87b6d218 | 147 | u64 rx_packets; |
148 | u64 rx_bytes; | |
149 | u64 tx_packets; | |
150 | u64 tx_bytes; | |
151 | struct u64_stats_sync syncp; | |
152 | }; | |
3c97af99 | 153 | |
87b6d218 | 154 | static struct rtnl_link_stats64 *ipip_get_stats64(struct net_device *dev, |
155 | struct rtnl_link_stats64 *tot) | |
3c97af99 | 156 | { |
3c97af99 ED |
157 | int i; |
158 | ||
159 | for_each_possible_cpu(i) { | |
160 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 161 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
162 | unsigned int start; | |
163 | ||
164 | do { | |
165 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
166 | rx_packets = tstats->rx_packets; | |
167 | tx_packets = tstats->tx_packets; | |
168 | rx_bytes = tstats->rx_bytes; | |
169 | tx_bytes = tstats->tx_bytes; | |
170 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
171 | ||
172 | tot->rx_packets += rx_packets; | |
173 | tot->tx_packets += tx_packets; | |
174 | tot->rx_bytes += rx_bytes; | |
175 | tot->tx_bytes += tx_bytes; | |
3c97af99 | 176 | } |
87b6d218 | 177 | |
178 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
179 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
180 | tot->tx_dropped = dev->stats.tx_dropped; | |
181 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
182 | tot->tx_errors = dev->stats.tx_errors; | |
183 | tot->collisions = dev->stats.collisions; | |
184 | ||
185 | return tot; | |
3c97af99 ED |
186 | } |
187 | ||
5e73ea1a | 188 | static struct ip_tunnel *ipip_tunnel_lookup(struct net *net, |
b9fae5c9 | 189 | __be32 remote, __be32 local) |
1da177e4 | 190 | { |
b7285b79 ED |
191 | unsigned int h0 = HASH(remote); |
192 | unsigned int h1 = HASH(local); | |
1da177e4 | 193 | struct ip_tunnel *t; |
44d3c299 | 194 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 195 | |
8f95dd63 | 196 | for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) |
1da177e4 LT |
197 | if (local == t->parms.iph.saddr && |
198 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
199 | return t; | |
8f95dd63 ED |
200 | |
201 | for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) | |
1da177e4 LT |
202 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
203 | return t; | |
8f95dd63 ED |
204 | |
205 | for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) | |
1da177e4 LT |
206 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
207 | return t; | |
8f95dd63 ED |
208 | |
209 | t = rcu_dereference(ipn->tunnels_wc[0]); | |
210 | if (t && (t->dev->flags&IFF_UP)) | |
1da177e4 LT |
211 | return t; |
212 | return NULL; | |
213 | } | |
214 | ||
b7285b79 | 215 | static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 216 | struct ip_tunnel_parm *parms) |
1da177e4 | 217 | { |
87d1a164 YH |
218 | __be32 remote = parms->iph.daddr; |
219 | __be32 local = parms->iph.saddr; | |
b7285b79 | 220 | unsigned int h = 0; |
1da177e4 LT |
221 | int prio = 0; |
222 | ||
223 | if (remote) { | |
224 | prio |= 2; | |
225 | h ^= HASH(remote); | |
226 | } | |
227 | if (local) { | |
228 | prio |= 1; | |
229 | h ^= HASH(local); | |
230 | } | |
44d3c299 | 231 | return &ipn->tunnels[prio][h]; |
1da177e4 LT |
232 | } |
233 | ||
b7285b79 | 234 | static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 235 | struct ip_tunnel *t) |
87d1a164 | 236 | { |
b9fae5c9 | 237 | return __ipip_bucket(ipn, &t->parms); |
87d1a164 | 238 | } |
1da177e4 | 239 | |
b9fae5c9 | 240 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 241 | { |
b7285b79 ED |
242 | struct ip_tunnel __rcu **tp; |
243 | struct ip_tunnel *iter; | |
244 | ||
245 | for (tp = ipip_bucket(ipn, t); | |
246 | (iter = rtnl_dereference(*tp)) != NULL; | |
247 | tp = &iter->next) { | |
248 | if (t == iter) { | |
cf778b00 | 249 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
250 | break; |
251 | } | |
252 | } | |
253 | } | |
254 | ||
b9fae5c9 | 255 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 256 | { |
b7285b79 | 257 | struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); |
1da177e4 | 258 | |
cf778b00 ED |
259 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
260 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
261 | } |
262 | ||
5e73ea1a | 263 | static struct ip_tunnel *ipip_tunnel_locate(struct net *net, |
b9fae5c9 | 264 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 265 | { |
d5a0a1e3 AV |
266 | __be32 remote = parms->iph.daddr; |
267 | __be32 local = parms->iph.saddr; | |
b7285b79 ED |
268 | struct ip_tunnel *t, *nt; |
269 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 270 | struct net_device *dev; |
1da177e4 | 271 | char name[IFNAMSIZ]; |
b9fae5c9 | 272 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 273 | |
b7285b79 ED |
274 | for (tp = __ipip_bucket(ipn, parms); |
275 | (t = rtnl_dereference(*tp)) != NULL; | |
276 | tp = &t->next) { | |
1da177e4 LT |
277 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
278 | return t; | |
279 | } | |
280 | if (!create) | |
281 | return NULL; | |
282 | ||
283 | if (parms->name[0]) | |
284 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 285 | else |
3c97af99 | 286 | strcpy(name, "tunl%d"); |
1da177e4 LT |
287 | |
288 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
289 | if (dev == NULL) | |
290 | return NULL; | |
291 | ||
0a826406 PE |
292 | dev_net_set(dev, net); |
293 | ||
2941a486 | 294 | nt = netdev_priv(dev); |
1da177e4 LT |
295 | nt->parms = *parms; |
296 | ||
3c97af99 ED |
297 | if (ipip_tunnel_init(dev) < 0) |
298 | goto failed_free; | |
23a12b14 | 299 | |
b37d428b PE |
300 | if (register_netdevice(dev) < 0) |
301 | goto failed_free; | |
1da177e4 | 302 | |
72b36015 TF |
303 | strcpy(nt->parms.name, dev->name); |
304 | ||
1da177e4 | 305 | dev_hold(dev); |
b9fae5c9 | 306 | ipip_tunnel_link(ipn, nt); |
1da177e4 LT |
307 | return nt; |
308 | ||
b37d428b | 309 | failed_free: |
3c97af99 | 310 | ipip_dev_free(dev); |
1da177e4 LT |
311 | return NULL; |
312 | } | |
313 | ||
b7285b79 | 314 | /* called with RTNL */ |
1da177e4 LT |
315 | static void ipip_tunnel_uninit(struct net_device *dev) |
316 | { | |
b9855c54 PE |
317 | struct net *net = dev_net(dev); |
318 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
319 | ||
b7285b79 | 320 | if (dev == ipn->fb_tunnel_dev) |
a9b3cd7f | 321 | RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL); |
b7285b79 | 322 | else |
b9fae5c9 | 323 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
1da177e4 LT |
324 | dev_put(dev); |
325 | } | |
326 | ||
d2acc347 | 327 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 328 | { |
1da177e4 | 329 | |
071f92d0 | 330 | /* All the routers (except for Linux) return only |
1da177e4 LT |
331 | 8 bytes of packet payload. It means, that precise relaying of |
332 | ICMP in the real Internet is absolutely infeasible. | |
333 | */ | |
b71d1d42 | 334 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
335 | const int type = icmp_hdr(skb)->type; |
336 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 337 | struct ip_tunnel *t; |
d2acc347 | 338 | int err; |
1da177e4 LT |
339 | |
340 | switch (type) { | |
341 | default: | |
342 | case ICMP_PARAMETERPROB: | |
d2acc347 | 343 | return 0; |
1da177e4 LT |
344 | |
345 | case ICMP_DEST_UNREACH: | |
346 | switch (code) { | |
347 | case ICMP_SR_FAILED: | |
348 | case ICMP_PORT_UNREACH: | |
349 | /* Impossible event. */ | |
d2acc347 | 350 | return 0; |
1da177e4 LT |
351 | default: |
352 | /* All others are translated to HOST_UNREACH. | |
353 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
354 | I believe they are just ether pollution. --ANK | |
355 | */ | |
356 | break; | |
357 | } | |
358 | break; | |
359 | case ICMP_TIME_EXCEEDED: | |
360 | if (code != ICMP_EXC_TTL) | |
d2acc347 | 361 | return 0; |
1da177e4 | 362 | break; |
55be7a9c DM |
363 | case ICMP_REDIRECT: |
364 | break; | |
1da177e4 LT |
365 | } |
366 | ||
d2acc347 HX |
367 | err = -ENOENT; |
368 | ||
8f95dd63 | 369 | rcu_read_lock(); |
cec3ffae | 370 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
36393395 DM |
371 | if (t == NULL) |
372 | goto out; | |
373 | ||
374 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
375 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
376 | t->dev->ifindex, 0, IPPROTO_IPIP, 0); | |
377 | err = 0; | |
378 | goto out; | |
379 | } | |
380 | ||
55be7a9c DM |
381 | if (type == ICMP_REDIRECT) { |
382 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
383 | IPPROTO_IPIP, 0); | |
384 | err = 0; | |
385 | goto out; | |
386 | } | |
387 | ||
36393395 | 388 | if (t->parms.iph.daddr == 0) |
1da177e4 | 389 | goto out; |
d2acc347 HX |
390 | |
391 | err = 0; | |
1da177e4 LT |
392 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
393 | goto out; | |
394 | ||
26d94b46 | 395 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
396 | t->err_count++; |
397 | else | |
398 | t->err_count = 1; | |
399 | t->err_time = jiffies; | |
400 | out: | |
8f95dd63 | 401 | rcu_read_unlock(); |
d2acc347 | 402 | return err; |
1da177e4 LT |
403 | } |
404 | ||
eddc9ec5 ACM |
405 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
406 | struct sk_buff *skb) | |
1da177e4 | 407 | { |
eddc9ec5 | 408 | struct iphdr *inner_iph = ip_hdr(skb); |
1da177e4 LT |
409 | |
410 | if (INET_ECN_is_ce(outer_iph->tos)) | |
411 | IP_ECN_set_ce(inner_iph); | |
412 | } | |
413 | ||
414 | static int ipip_rcv(struct sk_buff *skb) | |
415 | { | |
1da177e4 | 416 | struct ip_tunnel *tunnel; |
eddc9ec5 | 417 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 418 | |
8f95dd63 | 419 | rcu_read_lock(); |
3c97af99 ED |
420 | tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); |
421 | if (tunnel != NULL) { | |
422 | struct pcpu_tstats *tstats; | |
423 | ||
1da177e4 | 424 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
8f95dd63 | 425 | rcu_read_unlock(); |
1da177e4 LT |
426 | kfree_skb(skb); |
427 | return 0; | |
428 | } | |
429 | ||
430 | secpath_reset(skb); | |
431 | ||
b0e380b1 | 432 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 433 | skb_reset_network_header(skb); |
1da177e4 LT |
434 | skb->protocol = htons(ETH_P_IP); |
435 | skb->pkt_type = PACKET_HOST; | |
436 | ||
3c97af99 | 437 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
87b6d218 | 438 | u64_stats_update_begin(&tstats->syncp); |
3c97af99 ED |
439 | tstats->rx_packets++; |
440 | tstats->rx_bytes += skb->len; | |
87b6d218 | 441 | u64_stats_update_end(&tstats->syncp); |
3c97af99 ED |
442 | |
443 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 444 | |
1da177e4 | 445 | ipip_ecn_decapsulate(iph, skb); |
8990f468 | 446 | |
caf586e5 | 447 | netif_rx(skb); |
8990f468 | 448 | |
8f95dd63 | 449 | rcu_read_unlock(); |
1da177e4 LT |
450 | return 0; |
451 | } | |
8f95dd63 | 452 | rcu_read_unlock(); |
1da177e4 | 453 | |
1da177e4 LT |
454 | return -1; |
455 | } | |
456 | ||
457 | /* | |
458 | * This function assumes it is being called from dev_queue_xmit() | |
459 | * and that skb is filled properly by that function. | |
460 | */ | |
461 | ||
6fef4c0c | 462 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 463 | { |
2941a486 | 464 | struct ip_tunnel *tunnel = netdev_priv(dev); |
3c97af99 | 465 | struct pcpu_tstats *tstats; |
b71d1d42 | 466 | const struct iphdr *tiph = &tunnel->parms.iph; |
1da177e4 | 467 | u8 tos = tunnel->parms.iph.tos; |
d5a0a1e3 | 468 | __be16 df = tiph->frag_off; |
1da177e4 | 469 | struct rtable *rt; /* Route to the other host */ |
3c97af99 | 470 | struct net_device *tdev; /* Device to other host */ |
b71d1d42 | 471 | const struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 472 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 473 | unsigned int max_headroom; /* The extra header space needed */ |
d5a0a1e3 | 474 | __be32 dst = tiph->daddr; |
31e4543d | 475 | struct flowi4 fl4; |
1da177e4 LT |
476 | int mtu; |
477 | ||
1da177e4 LT |
478 | if (skb->protocol != htons(ETH_P_IP)) |
479 | goto tx_error; | |
480 | ||
3c97af99 | 481 | if (tos & 1) |
1da177e4 LT |
482 | tos = old_iph->tos; |
483 | ||
484 | if (!dst) { | |
485 | /* NBMA tunnel */ | |
511c3f92 | 486 | if ((rt = skb_rtable(skb)) == NULL) { |
3c97af99 | 487 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
488 | goto tx_error; |
489 | } | |
658c8d96 | 490 | dst = rt->rt_gateway; |
1da177e4 LT |
491 | } |
492 | ||
31e4543d | 493 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
494 | dst, tiph->saddr, |
495 | 0, 0, | |
496 | IPPROTO_IPIP, RT_TOS(tos), | |
497 | tunnel->parms.link); | |
498 | if (IS_ERR(rt)) { | |
499 | dev->stats.tx_carrier_errors++; | |
500 | goto tx_error_icmp; | |
1da177e4 | 501 | } |
d8d1f30b | 502 | tdev = rt->dst.dev; |
1da177e4 LT |
503 | |
504 | if (tdev == dev) { | |
505 | ip_rt_put(rt); | |
3c97af99 | 506 | dev->stats.collisions++; |
1da177e4 LT |
507 | goto tx_error; |
508 | } | |
509 | ||
23ca0c98 HX |
510 | df |= old_iph->frag_off & htons(IP_DF); |
511 | ||
512 | if (df) { | |
d8d1f30b | 513 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 514 | |
23ca0c98 | 515 | if (mtu < 68) { |
3c97af99 | 516 | dev->stats.collisions++; |
23ca0c98 HX |
517 | ip_rt_put(rt); |
518 | goto tx_error; | |
519 | } | |
1da177e4 | 520 | |
23ca0c98 HX |
521 | if (skb_dst(skb)) |
522 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 523 | |
23ca0c98 HX |
524 | if ((old_iph->frag_off & htons(IP_DF)) && |
525 | mtu < ntohs(old_iph->tot_len)) { | |
526 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
527 | htonl(mtu)); | |
528 | ip_rt_put(rt); | |
529 | goto tx_error; | |
530 | } | |
1da177e4 LT |
531 | } |
532 | ||
533 | if (tunnel->err_count > 0) { | |
26d94b46 WY |
534 | if (time_before(jiffies, |
535 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
536 | tunnel->err_count--; |
537 | dst_link_failure(skb); | |
538 | } else | |
539 | tunnel->err_count = 0; | |
540 | } | |
541 | ||
542 | /* | |
543 | * Okay, now see if we can stuff it in the buffer as-is. | |
544 | */ | |
545 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
546 | ||
cfbba49d PM |
547 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
548 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
549 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
550 | if (!new_skb) { | |
551 | ip_rt_put(rt); | |
3c97af99 | 552 | dev->stats.tx_dropped++; |
1da177e4 | 553 | dev_kfree_skb(skb); |
6ed10654 | 554 | return NETDEV_TX_OK; |
1da177e4 LT |
555 | } |
556 | if (skb->sk) | |
557 | skb_set_owner_w(new_skb, skb->sk); | |
558 | dev_kfree_skb(skb); | |
559 | skb = new_skb; | |
eddc9ec5 | 560 | old_iph = ip_hdr(skb); |
1da177e4 LT |
561 | } |
562 | ||
b0e380b1 | 563 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
564 | skb_push(skb, sizeof(struct iphdr)); |
565 | skb_reset_network_header(skb); | |
1da177e4 | 566 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
567 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
568 | IPSKB_REROUTED); | |
adf30907 | 569 | skb_dst_drop(skb); |
d8d1f30b | 570 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
571 | |
572 | /* | |
573 | * Push down and install the IPIP header. | |
574 | */ | |
575 | ||
eddc9ec5 | 576 | iph = ip_hdr(skb); |
1da177e4 LT |
577 | iph->version = 4; |
578 | iph->ihl = sizeof(struct iphdr)>>2; | |
579 | iph->frag_off = df; | |
580 | iph->protocol = IPPROTO_IPIP; | |
581 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
69458cb1 DM |
582 | iph->daddr = fl4.daddr; |
583 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
584 | |
585 | if ((iph->ttl = tiph->ttl) == 0) | |
586 | iph->ttl = old_iph->ttl; | |
587 | ||
588 | nf_reset(skb); | |
3c97af99 ED |
589 | tstats = this_cpu_ptr(dev->tstats); |
590 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 591 | return NETDEV_TX_OK; |
1da177e4 LT |
592 | |
593 | tx_error_icmp: | |
594 | dst_link_failure(skb); | |
595 | tx_error: | |
3c97af99 | 596 | dev->stats.tx_errors++; |
1da177e4 | 597 | dev_kfree_skb(skb); |
6ed10654 | 598 | return NETDEV_TX_OK; |
1da177e4 LT |
599 | } |
600 | ||
5533995b MS |
601 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
602 | { | |
603 | struct net_device *tdev = NULL; | |
604 | struct ip_tunnel *tunnel; | |
b71d1d42 | 605 | const struct iphdr *iph; |
5533995b MS |
606 | |
607 | tunnel = netdev_priv(dev); | |
608 | iph = &tunnel->parms.iph; | |
609 | ||
610 | if (iph->daddr) { | |
31e4543d DM |
611 | struct rtable *rt; |
612 | struct flowi4 fl4; | |
613 | ||
614 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
615 | iph->daddr, iph->saddr, | |
616 | 0, 0, | |
617 | IPPROTO_IPIP, | |
618 | RT_TOS(iph->tos), | |
619 | tunnel->parms.link); | |
b23dd4fe | 620 | if (!IS_ERR(rt)) { |
d8d1f30b | 621 | tdev = rt->dst.dev; |
5533995b MS |
622 | ip_rt_put(rt); |
623 | } | |
624 | dev->flags |= IFF_POINTOPOINT; | |
625 | } | |
626 | ||
627 | if (!tdev && tunnel->parms.link) | |
b99f0152 | 628 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
5533995b MS |
629 | |
630 | if (tdev) { | |
631 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
632 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
633 | } | |
634 | dev->iflink = tunnel->parms.link; | |
635 | } | |
636 | ||
1da177e4 LT |
637 | static int |
638 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
639 | { | |
640 | int err = 0; | |
641 | struct ip_tunnel_parm p; | |
642 | struct ip_tunnel *t; | |
b9855c54 PE |
643 | struct net *net = dev_net(dev); |
644 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
1da177e4 LT |
645 | |
646 | switch (cmd) { | |
647 | case SIOCGETTUNNEL: | |
648 | t = NULL; | |
b9855c54 | 649 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
650 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
651 | err = -EFAULT; | |
652 | break; | |
653 | } | |
b9fae5c9 | 654 | t = ipip_tunnel_locate(net, &p, 0); |
1da177e4 LT |
655 | } |
656 | if (t == NULL) | |
2941a486 | 657 | t = netdev_priv(dev); |
1da177e4 LT |
658 | memcpy(&p, &t->parms, sizeof(p)); |
659 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
660 | err = -EFAULT; | |
661 | break; | |
662 | ||
663 | case SIOCADDTUNNEL: | |
664 | case SIOCCHGTUNNEL: | |
665 | err = -EPERM; | |
666 | if (!capable(CAP_NET_ADMIN)) | |
667 | goto done; | |
668 | ||
669 | err = -EFAULT; | |
670 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
671 | goto done; | |
672 | ||
673 | err = -EINVAL; | |
674 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || | |
675 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
676 | goto done; | |
677 | if (p.iph.ttl) | |
678 | p.iph.frag_off |= htons(IP_DF); | |
679 | ||
b9fae5c9 | 680 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 681 | |
b9855c54 | 682 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
683 | if (t != NULL) { |
684 | if (t->dev != dev) { | |
685 | err = -EEXIST; | |
686 | break; | |
687 | } | |
688 | } else { | |
689 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
690 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
691 | err = -EINVAL; | |
692 | break; | |
693 | } | |
2941a486 | 694 | t = netdev_priv(dev); |
b9fae5c9 | 695 | ipip_tunnel_unlink(ipn, t); |
74b0b85b | 696 | synchronize_net(); |
1da177e4 LT |
697 | t->parms.iph.saddr = p.iph.saddr; |
698 | t->parms.iph.daddr = p.iph.daddr; | |
699 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
700 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
b9fae5c9 | 701 | ipip_tunnel_link(ipn, t); |
1da177e4 LT |
702 | netdev_state_change(dev); |
703 | } | |
704 | } | |
705 | ||
706 | if (t) { | |
707 | err = 0; | |
708 | if (cmd == SIOCCHGTUNNEL) { | |
709 | t->parms.iph.ttl = p.iph.ttl; | |
710 | t->parms.iph.tos = p.iph.tos; | |
711 | t->parms.iph.frag_off = p.iph.frag_off; | |
5533995b MS |
712 | if (t->parms.link != p.link) { |
713 | t->parms.link = p.link; | |
714 | ipip_tunnel_bind_dev(dev); | |
715 | netdev_state_change(dev); | |
716 | } | |
1da177e4 LT |
717 | } |
718 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
719 | err = -EFAULT; | |
720 | } else | |
721 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
722 | break; | |
723 | ||
724 | case SIOCDELTUNNEL: | |
725 | err = -EPERM; | |
726 | if (!capable(CAP_NET_ADMIN)) | |
727 | goto done; | |
728 | ||
b9855c54 | 729 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
730 | err = -EFAULT; |
731 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
732 | goto done; | |
733 | err = -ENOENT; | |
b9fae5c9 | 734 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
735 | goto done; |
736 | err = -EPERM; | |
b9855c54 | 737 | if (t->dev == ipn->fb_tunnel_dev) |
1da177e4 LT |
738 | goto done; |
739 | dev = t->dev; | |
740 | } | |
22f8cde5 SH |
741 | unregister_netdevice(dev); |
742 | err = 0; | |
1da177e4 LT |
743 | break; |
744 | ||
745 | default: | |
746 | err = -EINVAL; | |
747 | } | |
748 | ||
749 | done: | |
750 | return err; | |
751 | } | |
752 | ||
1da177e4 LT |
753 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
754 | { | |
755 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
756 | return -EINVAL; | |
757 | dev->mtu = new_mtu; | |
758 | return 0; | |
759 | } | |
760 | ||
23a12b14 SH |
761 | static const struct net_device_ops ipip_netdev_ops = { |
762 | .ndo_uninit = ipip_tunnel_uninit, | |
763 | .ndo_start_xmit = ipip_tunnel_xmit, | |
764 | .ndo_do_ioctl = ipip_tunnel_ioctl, | |
765 | .ndo_change_mtu = ipip_tunnel_change_mtu, | |
87b6d218 | 766 | .ndo_get_stats64 = ipip_get_stats64, |
23a12b14 SH |
767 | }; |
768 | ||
3c97af99 ED |
769 | static void ipip_dev_free(struct net_device *dev) |
770 | { | |
771 | free_percpu(dev->tstats); | |
772 | free_netdev(dev); | |
773 | } | |
774 | ||
1da177e4 LT |
775 | static void ipip_tunnel_setup(struct net_device *dev) |
776 | { | |
23a12b14 | 777 | dev->netdev_ops = &ipip_netdev_ops; |
3c97af99 | 778 | dev->destructor = ipip_dev_free; |
1da177e4 LT |
779 | |
780 | dev->type = ARPHRD_TUNNEL; | |
781 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 782 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
783 | dev->flags = IFF_NOARP; |
784 | dev->iflink = 0; | |
785 | dev->addr_len = 4; | |
0a826406 | 786 | dev->features |= NETIF_F_NETNS_LOCAL; |
153f0943 | 787 | dev->features |= NETIF_F_LLTX; |
28e72216 | 788 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
789 | } |
790 | ||
3c97af99 | 791 | static int ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 792 | { |
23a12b14 | 793 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
794 | |
795 | tunnel->dev = dev; | |
1da177e4 LT |
796 | |
797 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
798 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
799 | ||
5533995b | 800 | ipip_tunnel_bind_dev(dev); |
3c97af99 ED |
801 | |
802 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
803 | if (!dev->tstats) | |
804 | return -ENOMEM; | |
805 | ||
806 | return 0; | |
1da177e4 LT |
807 | } |
808 | ||
fada5636 | 809 | static int __net_init ipip_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 810 | { |
2941a486 | 811 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 812 | struct iphdr *iph = &tunnel->parms.iph; |
44d3c299 | 813 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
1da177e4 LT |
814 | |
815 | tunnel->dev = dev; | |
816 | strcpy(tunnel->parms.name, dev->name); | |
817 | ||
818 | iph->version = 4; | |
819 | iph->protocol = IPPROTO_IPIP; | |
820 | iph->ihl = 5; | |
821 | ||
fada5636 ED |
822 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
823 | if (!dev->tstats) | |
824 | return -ENOMEM; | |
825 | ||
1da177e4 | 826 | dev_hold(dev); |
cf778b00 | 827 | rcu_assign_pointer(ipn->tunnels_wc[0], tunnel); |
fada5636 | 828 | return 0; |
1da177e4 LT |
829 | } |
830 | ||
6dcd814b | 831 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1da177e4 LT |
832 | .handler = ipip_rcv, |
833 | .err_handler = ipip_err, | |
d2acc347 | 834 | .priority = 1, |
1da177e4 LT |
835 | }; |
836 | ||
5747a1aa | 837 | static const char banner[] __initconst = |
1da177e4 LT |
838 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
839 | ||
0694c4c0 | 840 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) |
44d3c299 PE |
841 | { |
842 | int prio; | |
843 | ||
844 | for (prio = 1; prio < 4; prio++) { | |
845 | int h; | |
846 | for (h = 0; h < HASH_SIZE; h++) { | |
b7285b79 | 847 | struct ip_tunnel *t; |
0694c4c0 | 848 | |
b7285b79 | 849 | t = rtnl_dereference(ipn->tunnels[prio][h]); |
0694c4c0 ED |
850 | while (t != NULL) { |
851 | unregister_netdevice_queue(t->dev, head); | |
b7285b79 | 852 | t = rtnl_dereference(t->next); |
0694c4c0 | 853 | } |
44d3c299 PE |
854 | } |
855 | } | |
856 | } | |
857 | ||
2c8c1e72 | 858 | static int __net_init ipip_init_net(struct net *net) |
10dc4c7b | 859 | { |
86de8a63 | 860 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
72b36015 | 861 | struct ip_tunnel *t; |
10dc4c7b | 862 | int err; |
10dc4c7b | 863 | |
44d3c299 PE |
864 | ipn->tunnels[0] = ipn->tunnels_wc; |
865 | ipn->tunnels[1] = ipn->tunnels_l; | |
866 | ipn->tunnels[2] = ipn->tunnels_r; | |
867 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
868 | ||
b9855c54 PE |
869 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
870 | "tunl0", | |
871 | ipip_tunnel_setup); | |
872 | if (!ipn->fb_tunnel_dev) { | |
873 | err = -ENOMEM; | |
874 | goto err_alloc_dev; | |
875 | } | |
be77e593 | 876 | dev_net_set(ipn->fb_tunnel_dev, net); |
b9855c54 | 877 | |
fada5636 ED |
878 | err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
879 | if (err) | |
880 | goto err_reg_dev; | |
b9855c54 PE |
881 | |
882 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
883 | goto err_reg_dev; | |
884 | ||
72b36015 TF |
885 | t = netdev_priv(ipn->fb_tunnel_dev); |
886 | ||
887 | strcpy(t->parms.name, ipn->fb_tunnel_dev->name); | |
10dc4c7b PE |
888 | return 0; |
889 | ||
b9855c54 | 890 | err_reg_dev: |
fada5636 | 891 | ipip_dev_free(ipn->fb_tunnel_dev); |
b9855c54 PE |
892 | err_alloc_dev: |
893 | /* nothing */ | |
10dc4c7b PE |
894 | return err; |
895 | } | |
896 | ||
2c8c1e72 | 897 | static void __net_exit ipip_exit_net(struct net *net) |
10dc4c7b | 898 | { |
86de8a63 | 899 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
0694c4c0 | 900 | LIST_HEAD(list); |
10dc4c7b | 901 | |
b9855c54 | 902 | rtnl_lock(); |
0694c4c0 ED |
903 | ipip_destroy_tunnels(ipn, &list); |
904 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); | |
905 | unregister_netdevice_many(&list); | |
b9855c54 | 906 | rtnl_unlock(); |
10dc4c7b PE |
907 | } |
908 | ||
909 | static struct pernet_operations ipip_net_ops = { | |
910 | .init = ipip_init_net, | |
911 | .exit = ipip_exit_net, | |
86de8a63 EB |
912 | .id = &ipip_net_id, |
913 | .size = sizeof(struct ipip_net), | |
10dc4c7b PE |
914 | }; |
915 | ||
1da177e4 LT |
916 | static int __init ipip_init(void) |
917 | { | |
918 | int err; | |
919 | ||
920 | printk(banner); | |
921 | ||
d5aa407f AD |
922 | err = register_pernet_device(&ipip_net_ops); |
923 | if (err < 0) | |
924 | return err; | |
925 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
926 | if (err < 0) { | |
927 | unregister_pernet_device(&ipip_net_ops); | |
058bd4d2 | 928 | pr_info("%s: can't register tunnel\n", __func__); |
1da177e4 | 929 | } |
1da177e4 | 930 | return err; |
1da177e4 LT |
931 | } |
932 | ||
933 | static void __exit ipip_fini(void) | |
934 | { | |
c0d56408 | 935 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
058bd4d2 | 936 | pr_info("%s: can't deregister tunnel\n", __func__); |
1da177e4 | 937 | |
86de8a63 | 938 | unregister_pernet_device(&ipip_net_ops); |
1da177e4 LT |
939 | } |
940 | ||
941 | module_init(ipip_init); | |
942 | module_exit(ipip_fini); | |
943 | MODULE_LICENSE("GPL"); | |
8909c9ad | 944 | MODULE_ALIAS_NETDEV("tunl0"); |