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 { | |
147 | unsigned long rx_packets; | |
148 | unsigned long rx_bytes; | |
149 | unsigned long tx_packets; | |
150 | unsigned long tx_bytes; | |
8ce120f1 | 151 | } __attribute__((aligned(4*sizeof(unsigned long)))); |
3c97af99 ED |
152 | |
153 | static struct net_device_stats *ipip_get_stats(struct net_device *dev) | |
154 | { | |
155 | struct pcpu_tstats sum = { 0 }; | |
156 | int i; | |
157 | ||
158 | for_each_possible_cpu(i) { | |
159 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
160 | ||
161 | sum.rx_packets += tstats->rx_packets; | |
162 | sum.rx_bytes += tstats->rx_bytes; | |
163 | sum.tx_packets += tstats->tx_packets; | |
164 | sum.tx_bytes += tstats->tx_bytes; | |
165 | } | |
166 | dev->stats.rx_packets = sum.rx_packets; | |
167 | dev->stats.rx_bytes = sum.rx_bytes; | |
168 | dev->stats.tx_packets = sum.tx_packets; | |
169 | dev->stats.tx_bytes = sum.tx_bytes; | |
170 | return &dev->stats; | |
171 | } | |
172 | ||
b9fae5c9 PE |
173 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, |
174 | __be32 remote, __be32 local) | |
1da177e4 | 175 | { |
b7285b79 ED |
176 | unsigned int h0 = HASH(remote); |
177 | unsigned int h1 = HASH(local); | |
1da177e4 | 178 | struct ip_tunnel *t; |
44d3c299 | 179 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 180 | |
8f95dd63 | 181 | for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) |
1da177e4 LT |
182 | if (local == t->parms.iph.saddr && |
183 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
184 | return t; | |
8f95dd63 ED |
185 | |
186 | for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) | |
1da177e4 LT |
187 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
188 | return t; | |
8f95dd63 ED |
189 | |
190 | for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) | |
1da177e4 LT |
191 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
192 | return t; | |
8f95dd63 ED |
193 | |
194 | t = rcu_dereference(ipn->tunnels_wc[0]); | |
195 | if (t && (t->dev->flags&IFF_UP)) | |
1da177e4 LT |
196 | return t; |
197 | return NULL; | |
198 | } | |
199 | ||
b7285b79 | 200 | static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 201 | struct ip_tunnel_parm *parms) |
1da177e4 | 202 | { |
87d1a164 YH |
203 | __be32 remote = parms->iph.daddr; |
204 | __be32 local = parms->iph.saddr; | |
b7285b79 | 205 | unsigned int h = 0; |
1da177e4 LT |
206 | int prio = 0; |
207 | ||
208 | if (remote) { | |
209 | prio |= 2; | |
210 | h ^= HASH(remote); | |
211 | } | |
212 | if (local) { | |
213 | prio |= 1; | |
214 | h ^= HASH(local); | |
215 | } | |
44d3c299 | 216 | return &ipn->tunnels[prio][h]; |
1da177e4 LT |
217 | } |
218 | ||
b7285b79 | 219 | static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 220 | struct ip_tunnel *t) |
87d1a164 | 221 | { |
b9fae5c9 | 222 | return __ipip_bucket(ipn, &t->parms); |
87d1a164 | 223 | } |
1da177e4 | 224 | |
b9fae5c9 | 225 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 226 | { |
b7285b79 ED |
227 | struct ip_tunnel __rcu **tp; |
228 | struct ip_tunnel *iter; | |
229 | ||
230 | for (tp = ipip_bucket(ipn, t); | |
231 | (iter = rtnl_dereference(*tp)) != NULL; | |
232 | tp = &iter->next) { | |
233 | if (t == iter) { | |
cf778b00 | 234 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
235 | break; |
236 | } | |
237 | } | |
238 | } | |
239 | ||
b9fae5c9 | 240 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 241 | { |
b7285b79 | 242 | struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); |
1da177e4 | 243 | |
cf778b00 ED |
244 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
245 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
246 | } |
247 | ||
b9fae5c9 PE |
248 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, |
249 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 250 | { |
d5a0a1e3 AV |
251 | __be32 remote = parms->iph.daddr; |
252 | __be32 local = parms->iph.saddr; | |
b7285b79 ED |
253 | struct ip_tunnel *t, *nt; |
254 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 255 | struct net_device *dev; |
1da177e4 | 256 | char name[IFNAMSIZ]; |
b9fae5c9 | 257 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 258 | |
b7285b79 ED |
259 | for (tp = __ipip_bucket(ipn, parms); |
260 | (t = rtnl_dereference(*tp)) != NULL; | |
261 | tp = &t->next) { | |
1da177e4 LT |
262 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
263 | return t; | |
264 | } | |
265 | if (!create) | |
266 | return NULL; | |
267 | ||
268 | if (parms->name[0]) | |
269 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 270 | else |
3c97af99 | 271 | strcpy(name, "tunl%d"); |
1da177e4 LT |
272 | |
273 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
274 | if (dev == NULL) | |
275 | return NULL; | |
276 | ||
0a826406 PE |
277 | dev_net_set(dev, net); |
278 | ||
2941a486 | 279 | nt = netdev_priv(dev); |
1da177e4 LT |
280 | nt->parms = *parms; |
281 | ||
3c97af99 ED |
282 | if (ipip_tunnel_init(dev) < 0) |
283 | goto failed_free; | |
23a12b14 | 284 | |
b37d428b PE |
285 | if (register_netdevice(dev) < 0) |
286 | goto failed_free; | |
1da177e4 | 287 | |
72b36015 TF |
288 | strcpy(nt->parms.name, dev->name); |
289 | ||
1da177e4 | 290 | dev_hold(dev); |
b9fae5c9 | 291 | ipip_tunnel_link(ipn, nt); |
1da177e4 LT |
292 | return nt; |
293 | ||
b37d428b | 294 | failed_free: |
3c97af99 | 295 | ipip_dev_free(dev); |
1da177e4 LT |
296 | return NULL; |
297 | } | |
298 | ||
b7285b79 | 299 | /* called with RTNL */ |
1da177e4 LT |
300 | static void ipip_tunnel_uninit(struct net_device *dev) |
301 | { | |
b9855c54 PE |
302 | struct net *net = dev_net(dev); |
303 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
304 | ||
b7285b79 | 305 | if (dev == ipn->fb_tunnel_dev) |
a9b3cd7f | 306 | RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL); |
b7285b79 | 307 | else |
b9fae5c9 | 308 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
1da177e4 LT |
309 | dev_put(dev); |
310 | } | |
311 | ||
d2acc347 | 312 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 313 | { |
1da177e4 | 314 | |
071f92d0 | 315 | /* All the routers (except for Linux) return only |
1da177e4 LT |
316 | 8 bytes of packet payload. It means, that precise relaying of |
317 | ICMP in the real Internet is absolutely infeasible. | |
318 | */ | |
b71d1d42 | 319 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
320 | const int type = icmp_hdr(skb)->type; |
321 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 322 | struct ip_tunnel *t; |
d2acc347 | 323 | int err; |
1da177e4 LT |
324 | |
325 | switch (type) { | |
326 | default: | |
327 | case ICMP_PARAMETERPROB: | |
d2acc347 | 328 | return 0; |
1da177e4 LT |
329 | |
330 | case ICMP_DEST_UNREACH: | |
331 | switch (code) { | |
332 | case ICMP_SR_FAILED: | |
333 | case ICMP_PORT_UNREACH: | |
334 | /* Impossible event. */ | |
d2acc347 | 335 | return 0; |
1da177e4 LT |
336 | case ICMP_FRAG_NEEDED: |
337 | /* Soft state for pmtu is maintained by IP core. */ | |
d2acc347 | 338 | return 0; |
1da177e4 LT |
339 | default: |
340 | /* All others are translated to HOST_UNREACH. | |
341 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
342 | I believe they are just ether pollution. --ANK | |
343 | */ | |
344 | break; | |
345 | } | |
346 | break; | |
347 | case ICMP_TIME_EXCEEDED: | |
348 | if (code != ICMP_EXC_TTL) | |
d2acc347 | 349 | return 0; |
1da177e4 LT |
350 | break; |
351 | } | |
352 | ||
d2acc347 HX |
353 | err = -ENOENT; |
354 | ||
8f95dd63 | 355 | rcu_read_lock(); |
cec3ffae | 356 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
357 | if (t == NULL || t->parms.iph.daddr == 0) |
358 | goto out; | |
d2acc347 HX |
359 | |
360 | err = 0; | |
1da177e4 LT |
361 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
362 | goto out; | |
363 | ||
26d94b46 | 364 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
365 | t->err_count++; |
366 | else | |
367 | t->err_count = 1; | |
368 | t->err_time = jiffies; | |
369 | out: | |
8f95dd63 | 370 | rcu_read_unlock(); |
d2acc347 | 371 | return err; |
1da177e4 LT |
372 | } |
373 | ||
eddc9ec5 ACM |
374 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
375 | struct sk_buff *skb) | |
1da177e4 | 376 | { |
eddc9ec5 | 377 | struct iphdr *inner_iph = ip_hdr(skb); |
1da177e4 LT |
378 | |
379 | if (INET_ECN_is_ce(outer_iph->tos)) | |
380 | IP_ECN_set_ce(inner_iph); | |
381 | } | |
382 | ||
383 | static int ipip_rcv(struct sk_buff *skb) | |
384 | { | |
1da177e4 | 385 | struct ip_tunnel *tunnel; |
eddc9ec5 | 386 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 387 | |
8f95dd63 | 388 | rcu_read_lock(); |
3c97af99 ED |
389 | tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); |
390 | if (tunnel != NULL) { | |
391 | struct pcpu_tstats *tstats; | |
392 | ||
1da177e4 | 393 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
8f95dd63 | 394 | rcu_read_unlock(); |
1da177e4 LT |
395 | kfree_skb(skb); |
396 | return 0; | |
397 | } | |
398 | ||
399 | secpath_reset(skb); | |
400 | ||
b0e380b1 | 401 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 402 | skb_reset_network_header(skb); |
1da177e4 LT |
403 | skb->protocol = htons(ETH_P_IP); |
404 | skb->pkt_type = PACKET_HOST; | |
405 | ||
3c97af99 ED |
406 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
407 | tstats->rx_packets++; | |
408 | tstats->rx_bytes += skb->len; | |
409 | ||
410 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 411 | |
1da177e4 | 412 | ipip_ecn_decapsulate(iph, skb); |
8990f468 | 413 | |
caf586e5 | 414 | netif_rx(skb); |
8990f468 | 415 | |
8f95dd63 | 416 | rcu_read_unlock(); |
1da177e4 LT |
417 | return 0; |
418 | } | |
8f95dd63 | 419 | rcu_read_unlock(); |
1da177e4 | 420 | |
1da177e4 LT |
421 | return -1; |
422 | } | |
423 | ||
424 | /* | |
425 | * This function assumes it is being called from dev_queue_xmit() | |
426 | * and that skb is filled properly by that function. | |
427 | */ | |
428 | ||
6fef4c0c | 429 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 430 | { |
2941a486 | 431 | struct ip_tunnel *tunnel = netdev_priv(dev); |
3c97af99 | 432 | struct pcpu_tstats *tstats; |
b71d1d42 | 433 | const struct iphdr *tiph = &tunnel->parms.iph; |
1da177e4 | 434 | u8 tos = tunnel->parms.iph.tos; |
d5a0a1e3 | 435 | __be16 df = tiph->frag_off; |
1da177e4 | 436 | struct rtable *rt; /* Route to the other host */ |
3c97af99 | 437 | struct net_device *tdev; /* Device to other host */ |
b71d1d42 | 438 | const struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 439 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 440 | unsigned int max_headroom; /* The extra header space needed */ |
d5a0a1e3 | 441 | __be32 dst = tiph->daddr; |
31e4543d | 442 | struct flowi4 fl4; |
1da177e4 LT |
443 | int mtu; |
444 | ||
1da177e4 LT |
445 | if (skb->protocol != htons(ETH_P_IP)) |
446 | goto tx_error; | |
447 | ||
3c97af99 | 448 | if (tos & 1) |
1da177e4 LT |
449 | tos = old_iph->tos; |
450 | ||
451 | if (!dst) { | |
452 | /* NBMA tunnel */ | |
511c3f92 | 453 | if ((rt = skb_rtable(skb)) == NULL) { |
3c97af99 | 454 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
455 | goto tx_error; |
456 | } | |
658c8d96 | 457 | dst = rt->rt_gateway; |
1da177e4 LT |
458 | } |
459 | ||
31e4543d | 460 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
461 | dst, tiph->saddr, |
462 | 0, 0, | |
463 | IPPROTO_IPIP, RT_TOS(tos), | |
464 | tunnel->parms.link); | |
465 | if (IS_ERR(rt)) { | |
466 | dev->stats.tx_carrier_errors++; | |
467 | goto tx_error_icmp; | |
1da177e4 | 468 | } |
d8d1f30b | 469 | tdev = rt->dst.dev; |
1da177e4 LT |
470 | |
471 | if (tdev == dev) { | |
472 | ip_rt_put(rt); | |
3c97af99 | 473 | dev->stats.collisions++; |
1da177e4 LT |
474 | goto tx_error; |
475 | } | |
476 | ||
23ca0c98 HX |
477 | df |= old_iph->frag_off & htons(IP_DF); |
478 | ||
479 | if (df) { | |
d8d1f30b | 480 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 481 | |
23ca0c98 | 482 | if (mtu < 68) { |
3c97af99 | 483 | dev->stats.collisions++; |
23ca0c98 HX |
484 | ip_rt_put(rt); |
485 | goto tx_error; | |
486 | } | |
1da177e4 | 487 | |
23ca0c98 HX |
488 | if (skb_dst(skb)) |
489 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 490 | |
23ca0c98 HX |
491 | if ((old_iph->frag_off & htons(IP_DF)) && |
492 | mtu < ntohs(old_iph->tot_len)) { | |
493 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
494 | htonl(mtu)); | |
495 | ip_rt_put(rt); | |
496 | goto tx_error; | |
497 | } | |
1da177e4 LT |
498 | } |
499 | ||
500 | if (tunnel->err_count > 0) { | |
26d94b46 WY |
501 | if (time_before(jiffies, |
502 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
503 | tunnel->err_count--; |
504 | dst_link_failure(skb); | |
505 | } else | |
506 | tunnel->err_count = 0; | |
507 | } | |
508 | ||
509 | /* | |
510 | * Okay, now see if we can stuff it in the buffer as-is. | |
511 | */ | |
512 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
513 | ||
cfbba49d PM |
514 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
515 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
516 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
517 | if (!new_skb) { | |
518 | ip_rt_put(rt); | |
3c97af99 | 519 | dev->stats.tx_dropped++; |
1da177e4 | 520 | dev_kfree_skb(skb); |
6ed10654 | 521 | return NETDEV_TX_OK; |
1da177e4 LT |
522 | } |
523 | if (skb->sk) | |
524 | skb_set_owner_w(new_skb, skb->sk); | |
525 | dev_kfree_skb(skb); | |
526 | skb = new_skb; | |
eddc9ec5 | 527 | old_iph = ip_hdr(skb); |
1da177e4 LT |
528 | } |
529 | ||
b0e380b1 | 530 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
531 | skb_push(skb, sizeof(struct iphdr)); |
532 | skb_reset_network_header(skb); | |
1da177e4 | 533 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
534 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
535 | IPSKB_REROUTED); | |
adf30907 | 536 | skb_dst_drop(skb); |
d8d1f30b | 537 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
538 | |
539 | /* | |
540 | * Push down and install the IPIP header. | |
541 | */ | |
542 | ||
eddc9ec5 | 543 | iph = ip_hdr(skb); |
1da177e4 LT |
544 | iph->version = 4; |
545 | iph->ihl = sizeof(struct iphdr)>>2; | |
546 | iph->frag_off = df; | |
547 | iph->protocol = IPPROTO_IPIP; | |
548 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
69458cb1 DM |
549 | iph->daddr = fl4.daddr; |
550 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
551 | |
552 | if ((iph->ttl = tiph->ttl) == 0) | |
553 | iph->ttl = old_iph->ttl; | |
554 | ||
555 | nf_reset(skb); | |
3c97af99 ED |
556 | tstats = this_cpu_ptr(dev->tstats); |
557 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 558 | return NETDEV_TX_OK; |
1da177e4 LT |
559 | |
560 | tx_error_icmp: | |
561 | dst_link_failure(skb); | |
562 | tx_error: | |
3c97af99 | 563 | dev->stats.tx_errors++; |
1da177e4 | 564 | dev_kfree_skb(skb); |
6ed10654 | 565 | return NETDEV_TX_OK; |
1da177e4 LT |
566 | } |
567 | ||
5533995b MS |
568 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
569 | { | |
570 | struct net_device *tdev = NULL; | |
571 | struct ip_tunnel *tunnel; | |
b71d1d42 | 572 | const struct iphdr *iph; |
5533995b MS |
573 | |
574 | tunnel = netdev_priv(dev); | |
575 | iph = &tunnel->parms.iph; | |
576 | ||
577 | if (iph->daddr) { | |
31e4543d DM |
578 | struct rtable *rt; |
579 | struct flowi4 fl4; | |
580 | ||
581 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
582 | iph->daddr, iph->saddr, | |
583 | 0, 0, | |
584 | IPPROTO_IPIP, | |
585 | RT_TOS(iph->tos), | |
586 | tunnel->parms.link); | |
b23dd4fe | 587 | if (!IS_ERR(rt)) { |
d8d1f30b | 588 | tdev = rt->dst.dev; |
5533995b MS |
589 | ip_rt_put(rt); |
590 | } | |
591 | dev->flags |= IFF_POINTOPOINT; | |
592 | } | |
593 | ||
594 | if (!tdev && tunnel->parms.link) | |
b99f0152 | 595 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
5533995b MS |
596 | |
597 | if (tdev) { | |
598 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
599 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
600 | } | |
601 | dev->iflink = tunnel->parms.link; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | static int |
605 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
606 | { | |
607 | int err = 0; | |
608 | struct ip_tunnel_parm p; | |
609 | struct ip_tunnel *t; | |
b9855c54 PE |
610 | struct net *net = dev_net(dev); |
611 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
1da177e4 LT |
612 | |
613 | switch (cmd) { | |
614 | case SIOCGETTUNNEL: | |
615 | t = NULL; | |
b9855c54 | 616 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
617 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
618 | err = -EFAULT; | |
619 | break; | |
620 | } | |
b9fae5c9 | 621 | t = ipip_tunnel_locate(net, &p, 0); |
1da177e4 LT |
622 | } |
623 | if (t == NULL) | |
2941a486 | 624 | t = netdev_priv(dev); |
1da177e4 LT |
625 | memcpy(&p, &t->parms, sizeof(p)); |
626 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
627 | err = -EFAULT; | |
628 | break; | |
629 | ||
630 | case SIOCADDTUNNEL: | |
631 | case SIOCCHGTUNNEL: | |
632 | err = -EPERM; | |
633 | if (!capable(CAP_NET_ADMIN)) | |
634 | goto done; | |
635 | ||
636 | err = -EFAULT; | |
637 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
638 | goto done; | |
639 | ||
640 | err = -EINVAL; | |
641 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || | |
642 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
643 | goto done; | |
644 | if (p.iph.ttl) | |
645 | p.iph.frag_off |= htons(IP_DF); | |
646 | ||
b9fae5c9 | 647 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 648 | |
b9855c54 | 649 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
650 | if (t != NULL) { |
651 | if (t->dev != dev) { | |
652 | err = -EEXIST; | |
653 | break; | |
654 | } | |
655 | } else { | |
656 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
657 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
658 | err = -EINVAL; | |
659 | break; | |
660 | } | |
2941a486 | 661 | t = netdev_priv(dev); |
b9fae5c9 | 662 | ipip_tunnel_unlink(ipn, t); |
74b0b85b | 663 | synchronize_net(); |
1da177e4 LT |
664 | t->parms.iph.saddr = p.iph.saddr; |
665 | t->parms.iph.daddr = p.iph.daddr; | |
666 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
667 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
b9fae5c9 | 668 | ipip_tunnel_link(ipn, t); |
1da177e4 LT |
669 | netdev_state_change(dev); |
670 | } | |
671 | } | |
672 | ||
673 | if (t) { | |
674 | err = 0; | |
675 | if (cmd == SIOCCHGTUNNEL) { | |
676 | t->parms.iph.ttl = p.iph.ttl; | |
677 | t->parms.iph.tos = p.iph.tos; | |
678 | t->parms.iph.frag_off = p.iph.frag_off; | |
5533995b MS |
679 | if (t->parms.link != p.link) { |
680 | t->parms.link = p.link; | |
681 | ipip_tunnel_bind_dev(dev); | |
682 | netdev_state_change(dev); | |
683 | } | |
1da177e4 LT |
684 | } |
685 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
686 | err = -EFAULT; | |
687 | } else | |
688 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
689 | break; | |
690 | ||
691 | case SIOCDELTUNNEL: | |
692 | err = -EPERM; | |
693 | if (!capable(CAP_NET_ADMIN)) | |
694 | goto done; | |
695 | ||
b9855c54 | 696 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
697 | err = -EFAULT; |
698 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
699 | goto done; | |
700 | err = -ENOENT; | |
b9fae5c9 | 701 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
702 | goto done; |
703 | err = -EPERM; | |
b9855c54 | 704 | if (t->dev == ipn->fb_tunnel_dev) |
1da177e4 LT |
705 | goto done; |
706 | dev = t->dev; | |
707 | } | |
22f8cde5 SH |
708 | unregister_netdevice(dev); |
709 | err = 0; | |
1da177e4 LT |
710 | break; |
711 | ||
712 | default: | |
713 | err = -EINVAL; | |
714 | } | |
715 | ||
716 | done: | |
717 | return err; | |
718 | } | |
719 | ||
1da177e4 LT |
720 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
721 | { | |
722 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
723 | return -EINVAL; | |
724 | dev->mtu = new_mtu; | |
725 | return 0; | |
726 | } | |
727 | ||
23a12b14 SH |
728 | static const struct net_device_ops ipip_netdev_ops = { |
729 | .ndo_uninit = ipip_tunnel_uninit, | |
730 | .ndo_start_xmit = ipip_tunnel_xmit, | |
731 | .ndo_do_ioctl = ipip_tunnel_ioctl, | |
732 | .ndo_change_mtu = ipip_tunnel_change_mtu, | |
3c97af99 | 733 | .ndo_get_stats = ipip_get_stats, |
23a12b14 SH |
734 | }; |
735 | ||
3c97af99 ED |
736 | static void ipip_dev_free(struct net_device *dev) |
737 | { | |
738 | free_percpu(dev->tstats); | |
739 | free_netdev(dev); | |
740 | } | |
741 | ||
1da177e4 LT |
742 | static void ipip_tunnel_setup(struct net_device *dev) |
743 | { | |
23a12b14 | 744 | dev->netdev_ops = &ipip_netdev_ops; |
3c97af99 | 745 | dev->destructor = ipip_dev_free; |
1da177e4 LT |
746 | |
747 | dev->type = ARPHRD_TUNNEL; | |
748 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 749 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
750 | dev->flags = IFF_NOARP; |
751 | dev->iflink = 0; | |
752 | dev->addr_len = 4; | |
0a826406 | 753 | dev->features |= NETIF_F_NETNS_LOCAL; |
153f0943 | 754 | dev->features |= NETIF_F_LLTX; |
28e72216 | 755 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
756 | } |
757 | ||
3c97af99 | 758 | static int ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 759 | { |
23a12b14 | 760 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
761 | |
762 | tunnel->dev = dev; | |
1da177e4 LT |
763 | |
764 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
765 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
766 | ||
5533995b | 767 | ipip_tunnel_bind_dev(dev); |
3c97af99 ED |
768 | |
769 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
770 | if (!dev->tstats) | |
771 | return -ENOMEM; | |
772 | ||
773 | return 0; | |
1da177e4 LT |
774 | } |
775 | ||
fada5636 | 776 | static int __net_init ipip_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 777 | { |
2941a486 | 778 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 779 | struct iphdr *iph = &tunnel->parms.iph; |
44d3c299 | 780 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
1da177e4 LT |
781 | |
782 | tunnel->dev = dev; | |
783 | strcpy(tunnel->parms.name, dev->name); | |
784 | ||
785 | iph->version = 4; | |
786 | iph->protocol = IPPROTO_IPIP; | |
787 | iph->ihl = 5; | |
788 | ||
fada5636 ED |
789 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
790 | if (!dev->tstats) | |
791 | return -ENOMEM; | |
792 | ||
1da177e4 | 793 | dev_hold(dev); |
cf778b00 | 794 | rcu_assign_pointer(ipn->tunnels_wc[0], tunnel); |
fada5636 | 795 | return 0; |
1da177e4 LT |
796 | } |
797 | ||
6dcd814b | 798 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1da177e4 LT |
799 | .handler = ipip_rcv, |
800 | .err_handler = ipip_err, | |
d2acc347 | 801 | .priority = 1, |
1da177e4 LT |
802 | }; |
803 | ||
5747a1aa | 804 | static const char banner[] __initconst = |
1da177e4 LT |
805 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
806 | ||
0694c4c0 | 807 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) |
44d3c299 PE |
808 | { |
809 | int prio; | |
810 | ||
811 | for (prio = 1; prio < 4; prio++) { | |
812 | int h; | |
813 | for (h = 0; h < HASH_SIZE; h++) { | |
b7285b79 | 814 | struct ip_tunnel *t; |
0694c4c0 | 815 | |
b7285b79 | 816 | t = rtnl_dereference(ipn->tunnels[prio][h]); |
0694c4c0 ED |
817 | while (t != NULL) { |
818 | unregister_netdevice_queue(t->dev, head); | |
b7285b79 | 819 | t = rtnl_dereference(t->next); |
0694c4c0 | 820 | } |
44d3c299 PE |
821 | } |
822 | } | |
823 | } | |
824 | ||
2c8c1e72 | 825 | static int __net_init ipip_init_net(struct net *net) |
10dc4c7b | 826 | { |
86de8a63 | 827 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
72b36015 | 828 | struct ip_tunnel *t; |
10dc4c7b | 829 | int err; |
10dc4c7b | 830 | |
44d3c299 PE |
831 | ipn->tunnels[0] = ipn->tunnels_wc; |
832 | ipn->tunnels[1] = ipn->tunnels_l; | |
833 | ipn->tunnels[2] = ipn->tunnels_r; | |
834 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
835 | ||
b9855c54 PE |
836 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
837 | "tunl0", | |
838 | ipip_tunnel_setup); | |
839 | if (!ipn->fb_tunnel_dev) { | |
840 | err = -ENOMEM; | |
841 | goto err_alloc_dev; | |
842 | } | |
be77e593 | 843 | dev_net_set(ipn->fb_tunnel_dev, net); |
b9855c54 | 844 | |
fada5636 ED |
845 | err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
846 | if (err) | |
847 | goto err_reg_dev; | |
b9855c54 PE |
848 | |
849 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
850 | goto err_reg_dev; | |
851 | ||
72b36015 TF |
852 | t = netdev_priv(ipn->fb_tunnel_dev); |
853 | ||
854 | strcpy(t->parms.name, ipn->fb_tunnel_dev->name); | |
10dc4c7b PE |
855 | return 0; |
856 | ||
b9855c54 | 857 | err_reg_dev: |
fada5636 | 858 | ipip_dev_free(ipn->fb_tunnel_dev); |
b9855c54 PE |
859 | err_alloc_dev: |
860 | /* nothing */ | |
10dc4c7b PE |
861 | return err; |
862 | } | |
863 | ||
2c8c1e72 | 864 | static void __net_exit ipip_exit_net(struct net *net) |
10dc4c7b | 865 | { |
86de8a63 | 866 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
0694c4c0 | 867 | LIST_HEAD(list); |
10dc4c7b | 868 | |
b9855c54 | 869 | rtnl_lock(); |
0694c4c0 ED |
870 | ipip_destroy_tunnels(ipn, &list); |
871 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); | |
872 | unregister_netdevice_many(&list); | |
b9855c54 | 873 | rtnl_unlock(); |
10dc4c7b PE |
874 | } |
875 | ||
876 | static struct pernet_operations ipip_net_ops = { | |
877 | .init = ipip_init_net, | |
878 | .exit = ipip_exit_net, | |
86de8a63 EB |
879 | .id = &ipip_net_id, |
880 | .size = sizeof(struct ipip_net), | |
10dc4c7b PE |
881 | }; |
882 | ||
1da177e4 LT |
883 | static int __init ipip_init(void) |
884 | { | |
885 | int err; | |
886 | ||
887 | printk(banner); | |
888 | ||
d5aa407f AD |
889 | err = register_pernet_device(&ipip_net_ops); |
890 | if (err < 0) | |
891 | return err; | |
892 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
893 | if (err < 0) { | |
894 | unregister_pernet_device(&ipip_net_ops); | |
1da177e4 | 895 | printk(KERN_INFO "ipip init: can't register tunnel\n"); |
1da177e4 | 896 | } |
1da177e4 | 897 | return err; |
1da177e4 LT |
898 | } |
899 | ||
900 | static void __exit ipip_fini(void) | |
901 | { | |
c0d56408 | 902 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
1da177e4 LT |
903 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); |
904 | ||
86de8a63 | 905 | unregister_pernet_device(&ipip_net_ops); |
1da177e4 LT |
906 | } |
907 | ||
908 | module_init(ipip_init); | |
909 | module_exit(ipip_fini); | |
910 | MODULE_LICENSE("GPL"); | |
8909c9ad | 911 | MODULE_ALIAS_NETDEV("tunl0"); |