Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
e905a9ed | 2 | * Linux NET3: GRE over IP protocol decoder. |
1da177e4 LT |
3 | * |
4 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
afd46503 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/types.h> | |
1da177e4 | 18 | #include <linux/kernel.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <asm/uaccess.h> |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/tcp.h> | |
25 | #include <linux/udp.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/mroute.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/inetdevice.h> | |
31 | #include <linux/igmp.h> | |
32 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 33 | #include <linux/etherdevice.h> |
46f25dff | 34 | #include <linux/if_ether.h> |
1da177e4 LT |
35 | |
36 | #include <net/sock.h> | |
37 | #include <net/ip.h> | |
38 | #include <net/icmp.h> | |
39 | #include <net/protocol.h> | |
c5441932 | 40 | #include <net/ip_tunnels.h> |
1da177e4 LT |
41 | #include <net/arp.h> |
42 | #include <net/checksum.h> | |
43 | #include <net/dsfield.h> | |
44 | #include <net/inet_ecn.h> | |
45 | #include <net/xfrm.h> | |
59a4c759 PE |
46 | #include <net/net_namespace.h> |
47 | #include <net/netns/generic.h> | |
c19e654d | 48 | #include <net/rtnetlink.h> |
00959ade | 49 | #include <net/gre.h> |
1da177e4 | 50 | |
dfd56b8b | 51 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
52 | #include <net/ipv6.h> |
53 | #include <net/ip6_fib.h> | |
54 | #include <net/ip6_route.h> | |
55 | #endif | |
56 | ||
57 | /* | |
58 | Problems & solutions | |
59 | -------------------- | |
60 | ||
61 | 1. The most important issue is detecting local dead loops. | |
62 | They would cause complete host lockup in transmit, which | |
63 | would be "resolved" by stack overflow or, if queueing is enabled, | |
64 | with infinite looping in net_bh. | |
65 | ||
66 | We cannot track such dead loops during route installation, | |
67 | it is infeasible task. The most general solutions would be | |
68 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 69 | and silently drop packet when it expires. It is a good |
bff52857 | 70 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
71 | skb, even if no tunneling is used. |
72 | ||
6d0722a2 ED |
73 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
74 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
75 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
76 | |
77 | 2. Networking dead loops would not kill routers, but would really | |
78 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
79 | if we copy it from packet being encapsulated to upper header. | |
80 | It is very good solution, but it introduces two problems: | |
81 | ||
82 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
83 | do not work over tunnels. | |
84 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
85 | so that this problem would be solved and traceroute output | |
86 | would even more informative. This idea appeared to be wrong: | |
87 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
88 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
89 | return only 8 bytes of payload. It is the end. | |
90 | ||
91 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
92 | we should search for another solution. | |
93 | ||
94 | One of them is to parse packet trying to detect inner encapsulation | |
95 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 96 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
97 | |
98 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
99 | We force DF flag on tunnels with preconfigured hop limit, | |
100 | that is ALL. :-) Well, it does not remove the problem completely, | |
101 | but exponential growth of network traffic is changed to linear | |
102 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 103 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
104 | Yes, it is not good if there exists a router in the loop, |
105 | which does not force DF, even when encapsulating packets have DF set. | |
106 | But it is not our problem! Nobody could accuse us, we made | |
107 | all that we could make. Even if it is your gated who injected | |
108 | fatal route to network, even if it were you who configured | |
109 | fatal static route: you are innocent. :-) | |
110 | ||
1da177e4 LT |
111 | Alexey Kuznetsov. |
112 | */ | |
113 | ||
eccc1bb8 | 114 | static bool log_ecn_error = true; |
115 | module_param(log_ecn_error, bool, 0644); | |
116 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
117 | ||
c19e654d | 118 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 | 119 | static int ipgre_tunnel_init(struct net_device *dev); |
eb8ce741 | 120 | |
f99189b1 | 121 | static int ipgre_net_id __read_mostly; |
c5441932 | 122 | static int gre_tap_net_id __read_mostly; |
1da177e4 | 123 | |
c5441932 PS |
124 | static __sum16 check_checksum(struct sk_buff *skb) |
125 | { | |
126 | __sum16 csum = 0; | |
1da177e4 | 127 | |
c5441932 PS |
128 | switch (skb->ip_summed) { |
129 | case CHECKSUM_COMPLETE: | |
130 | csum = csum_fold(skb->csum); | |
1da177e4 | 131 | |
c5441932 PS |
132 | if (!csum) |
133 | break; | |
134 | /* Fall through. */ | |
1da177e4 | 135 | |
c5441932 PS |
136 | case CHECKSUM_NONE: |
137 | skb->csum = 0; | |
138 | csum = __skb_checksum_complete(skb); | |
139 | skb->ip_summed = CHECKSUM_COMPLETE; | |
140 | break; | |
e985aad7 | 141 | } |
87b6d218 | 142 | |
c5441932 | 143 | return csum; |
e985aad7 ED |
144 | } |
145 | ||
c5441932 | 146 | static int ip_gre_calc_hlen(__be16 o_flags) |
d2083287 | 147 | { |
c5441932 | 148 | int addend = 4; |
d2083287 | 149 | |
c5441932 PS |
150 | if (o_flags&TUNNEL_CSUM) |
151 | addend += 4; | |
152 | if (o_flags&TUNNEL_KEY) | |
153 | addend += 4; | |
154 | if (o_flags&TUNNEL_SEQ) | |
155 | addend += 4; | |
156 | return addend; | |
157 | } | |
1da177e4 | 158 | |
c5441932 PS |
159 | static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
160 | bool *csum_err, int *hdr_len) | |
1da177e4 | 161 | { |
22251c73 ED |
162 | unsigned int ip_hlen = ip_hdrlen(skb); |
163 | const struct gre_base_hdr *greh; | |
c5441932 | 164 | __be32 *options; |
e1a80002 | 165 | |
c5441932 PS |
166 | if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr)))) |
167 | return -EINVAL; | |
e1a80002 | 168 | |
22251c73 | 169 | greh = (struct gre_base_hdr *)(skb_network_header(skb) + ip_hlen); |
c5441932 PS |
170 | if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING))) |
171 | return -EINVAL; | |
1da177e4 | 172 | |
c5441932 PS |
173 | tpi->flags = gre_flags_to_tnl_flags(greh->flags); |
174 | *hdr_len = ip_gre_calc_hlen(tpi->flags); | |
e1a80002 | 175 | |
c5441932 PS |
176 | if (!pskb_may_pull(skb, *hdr_len)) |
177 | return -EINVAL; | |
749c10f9 | 178 | |
22251c73 ED |
179 | greh = (struct gre_base_hdr *)(skb_network_header(skb) + ip_hlen); |
180 | ||
c5441932 | 181 | tpi->proto = greh->protocol; |
1da177e4 | 182 | |
c5441932 PS |
183 | options = (__be32 *)(greh + 1); |
184 | if (greh->flags & GRE_CSUM) { | |
185 | if (check_checksum(skb)) { | |
186 | *csum_err = true; | |
187 | return -EINVAL; | |
188 | } | |
189 | options++; | |
1da177e4 LT |
190 | } |
191 | ||
c5441932 PS |
192 | if (greh->flags & GRE_KEY) { |
193 | tpi->key = *options; | |
194 | options++; | |
195 | } else | |
196 | tpi->key = 0; | |
1da177e4 | 197 | |
c5441932 PS |
198 | if (unlikely(greh->flags & GRE_SEQ)) { |
199 | tpi->seq = *options; | |
200 | options++; | |
201 | } else | |
202 | tpi->seq = 0; | |
1da177e4 | 203 | |
c5441932 PS |
204 | /* WCCP version 1 and 2 protocol decoding. |
205 | * - Change protocol to IP | |
206 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
207 | */ | |
208 | if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) { | |
209 | tpi->proto = htons(ETH_P_IP); | |
210 | if ((*(u8 *)options & 0xF0) != 0x40) { | |
211 | *hdr_len += 4; | |
212 | if (!pskb_may_pull(skb, *hdr_len)) | |
213 | return -EINVAL; | |
1da177e4 LT |
214 | } |
215 | } | |
1da177e4 | 216 | |
c5441932 | 217 | return 0; |
1da177e4 LT |
218 | } |
219 | ||
1da177e4 LT |
220 | static void ipgre_err(struct sk_buff *skb, u32 info) |
221 | { | |
1da177e4 | 222 | |
c5441932 PS |
223 | /* All the routers (except for Linux) return only |
224 | 8 bytes of packet payload. It means, that precise relaying of | |
225 | ICMP in the real Internet is absolutely infeasible. | |
1da177e4 | 226 | |
c5441932 PS |
227 | Moreover, Cisco "wise men" put GRE key to the third word |
228 | in GRE header. It makes impossible maintaining even soft | |
229 | state for keyed GRE tunnels with enabled checksum. Tell | |
230 | them "thank you". | |
1da177e4 | 231 | |
c5441932 PS |
232 | Well, I wonder, rfc1812 was written by Cisco employee, |
233 | what the hell these idiots break standards established | |
234 | by themselves??? | |
235 | */ | |
236 | struct net *net = dev_net(skb->dev); | |
237 | struct ip_tunnel_net *itn; | |
96f5a846 | 238 | const struct iphdr *iph; |
88c7664f ACM |
239 | const int type = icmp_hdr(skb)->type; |
240 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 241 | struct ip_tunnel *t; |
c5441932 PS |
242 | struct tnl_ptk_info tpi; |
243 | int hdr_len; | |
244 | bool csum_err = false; | |
1da177e4 | 245 | |
c5441932 PS |
246 | if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len)) { |
247 | if (!csum_err) /* ignore csum errors. */ | |
1da177e4 | 248 | return; |
1da177e4 LT |
249 | } |
250 | ||
1da177e4 LT |
251 | switch (type) { |
252 | default: | |
253 | case ICMP_PARAMETERPROB: | |
254 | return; | |
255 | ||
256 | case ICMP_DEST_UNREACH: | |
257 | switch (code) { | |
258 | case ICMP_SR_FAILED: | |
259 | case ICMP_PORT_UNREACH: | |
260 | /* Impossible event. */ | |
261 | return; | |
1da177e4 LT |
262 | default: |
263 | /* All others are translated to HOST_UNREACH. | |
264 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
265 | I believe they are just ether pollution. --ANK | |
266 | */ | |
267 | break; | |
268 | } | |
269 | break; | |
270 | case ICMP_TIME_EXCEEDED: | |
271 | if (code != ICMP_EXC_TTL) | |
272 | return; | |
273 | break; | |
55be7a9c DM |
274 | |
275 | case ICMP_REDIRECT: | |
276 | break; | |
1da177e4 LT |
277 | } |
278 | ||
c5441932 PS |
279 | if (tpi.proto == htons(ETH_P_TEB)) |
280 | itn = net_generic(net, gre_tap_net_id); | |
281 | else | |
282 | itn = net_generic(net, ipgre_net_id); | |
283 | ||
96f5a846 | 284 | iph = (const struct iphdr *)skb->data; |
c5441932 PS |
285 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags, |
286 | iph->daddr, iph->saddr, tpi.key); | |
d2083287 | 287 | |
36393395 | 288 | if (t == NULL) |
0c5794a6 | 289 | return; |
36393395 DM |
290 | |
291 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
292 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
293 | t->parms.link, 0, IPPROTO_GRE, 0); | |
0c5794a6 | 294 | return; |
36393395 | 295 | } |
55be7a9c DM |
296 | if (type == ICMP_REDIRECT) { |
297 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, | |
298 | IPPROTO_GRE, 0); | |
0c5794a6 | 299 | return; |
55be7a9c | 300 | } |
36393395 | 301 | if (t->parms.iph.daddr == 0 || |
f97c1e0c | 302 | ipv4_is_multicast(t->parms.iph.daddr)) |
0c5794a6 | 303 | return; |
1da177e4 LT |
304 | |
305 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
0c5794a6 | 306 | return; |
1da177e4 | 307 | |
da6185d8 | 308 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
309 | t->err_count++; |
310 | else | |
311 | t->err_count = 1; | |
312 | t->err_time = jiffies; | |
1da177e4 LT |
313 | } |
314 | ||
1da177e4 LT |
315 | static int ipgre_rcv(struct sk_buff *skb) |
316 | { | |
c5441932 PS |
317 | struct net *net = dev_net(skb->dev); |
318 | struct ip_tunnel_net *itn; | |
b71d1d42 | 319 | const struct iphdr *iph; |
1da177e4 | 320 | struct ip_tunnel *tunnel; |
c5441932 PS |
321 | struct tnl_ptk_info tpi; |
322 | int hdr_len; | |
323 | bool csum_err = false; | |
1da177e4 | 324 | |
c5441932 | 325 | if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len) < 0) |
0c5794a6 | 326 | goto drop; |
1da177e4 | 327 | |
c5441932 PS |
328 | if (tpi.proto == htons(ETH_P_TEB)) |
329 | itn = net_generic(net, gre_tap_net_id); | |
330 | else | |
331 | itn = net_generic(net, ipgre_net_id); | |
1da177e4 | 332 | |
c5441932 PS |
333 | iph = ip_hdr(skb); |
334 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags, | |
335 | iph->saddr, iph->daddr, tpi.key); | |
e1a80002 | 336 | |
d2083287 | 337 | if (tunnel) { |
85e963b8 | 338 | skb_pop_mac_header(skb); |
b9099fea | 339 | ip_tunnel_rcv(tunnel, skb, &tpi, hdr_len, log_ecn_error); |
8990f468 | 340 | return 0; |
1da177e4 | 341 | } |
45af08be | 342 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 | 343 | drop: |
1da177e4 | 344 | kfree_skb(skb); |
a02cec21 | 345 | return 0; |
1da177e4 LT |
346 | } |
347 | ||
8f10098f | 348 | static struct sk_buff *handle_offloads(struct ip_tunnel *tunnel, struct sk_buff *skb) |
68c33163 PS |
349 | { |
350 | int err; | |
351 | ||
352 | if (skb_is_gso(skb)) { | |
353 | err = skb_unclone(skb, GFP_ATOMIC); | |
354 | if (unlikely(err)) | |
355 | goto error; | |
356 | skb_shinfo(skb)->gso_type |= SKB_GSO_GRE; | |
357 | return skb; | |
8f10098f | 358 | } else if (skb->ip_summed == CHECKSUM_PARTIAL && |
c5441932 | 359 | tunnel->parms.o_flags&TUNNEL_CSUM) { |
8f10098f PS |
360 | err = skb_checksum_help(skb); |
361 | if (unlikely(err)) | |
362 | goto error; | |
363 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) | |
aa0e51cd | 364 | skb->ip_summed = CHECKSUM_NONE; |
68c33163 PS |
365 | |
366 | return skb; | |
367 | ||
368 | error: | |
369 | kfree_skb(skb); | |
370 | return ERR_PTR(err); | |
371 | } | |
372 | ||
c5441932 PS |
373 | static struct sk_buff *gre_build_header(struct sk_buff *skb, |
374 | const struct tnl_ptk_info *tpi, | |
375 | int hdr_len) | |
1da177e4 | 376 | { |
c5441932 | 377 | struct gre_base_hdr *greh; |
68c33163 | 378 | |
c5441932 | 379 | skb_push(skb, hdr_len); |
6b78f16e | 380 | |
c5441932 PS |
381 | greh = (struct gre_base_hdr *)skb->data; |
382 | greh->flags = tnl_flags_to_gre_flags(tpi->flags); | |
383 | greh->protocol = tpi->proto; | |
cef401de | 384 | |
c5441932 PS |
385 | if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) { |
386 | __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4); | |
e1a80002 | 387 | |
c5441932 PS |
388 | if (tpi->flags&TUNNEL_SEQ) { |
389 | *ptr = tpi->seq; | |
390 | ptr--; | |
1da177e4 | 391 | } |
c5441932 PS |
392 | if (tpi->flags&TUNNEL_KEY) { |
393 | *ptr = tpi->key; | |
394 | ptr--; | |
61d57f87 | 395 | } |
c5441932 PS |
396 | if (tpi->flags&TUNNEL_CSUM && |
397 | !(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) { | |
398 | *(__sum16 *)ptr = 0; | |
399 | *(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0, | |
400 | skb->len, 0)); | |
1da177e4 | 401 | } |
1da177e4 LT |
402 | } |
403 | ||
c5441932 PS |
404 | return skb; |
405 | } | |
1da177e4 | 406 | |
c5441932 PS |
407 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
408 | const struct iphdr *tnl_params, | |
409 | __be16 proto) | |
410 | { | |
411 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
412 | struct tnl_ptk_info tpi; | |
1da177e4 | 413 | |
c5441932 PS |
414 | if (likely(!skb->encapsulation)) { |
415 | skb_reset_inner_headers(skb); | |
416 | skb->encapsulation = 1; | |
1da177e4 LT |
417 | } |
418 | ||
c5441932 PS |
419 | tpi.flags = tunnel->parms.o_flags; |
420 | tpi.proto = proto; | |
421 | tpi.key = tunnel->parms.o_key; | |
422 | if (tunnel->parms.o_flags & TUNNEL_SEQ) | |
423 | tunnel->o_seqno++; | |
424 | tpi.seq = htonl(tunnel->o_seqno); | |
1da177e4 | 425 | |
c5441932 PS |
426 | /* Push GRE header. */ |
427 | skb = gre_build_header(skb, &tpi, tunnel->hlen); | |
428 | if (unlikely(!skb)) { | |
429 | dev->stats.tx_dropped++; | |
430 | return; | |
1da177e4 | 431 | } |
1da177e4 | 432 | |
c5441932 PS |
433 | ip_tunnel_xmit(skb, dev, tnl_params); |
434 | } | |
1da177e4 | 435 | |
c5441932 PS |
436 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
437 | struct net_device *dev) | |
438 | { | |
439 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
440 | const struct iphdr *tnl_params; | |
1da177e4 | 441 | |
c5441932 PS |
442 | skb = handle_offloads(tunnel, skb); |
443 | if (IS_ERR(skb)) | |
444 | goto out; | |
1da177e4 | 445 | |
c5441932 PS |
446 | if (dev->header_ops) { |
447 | /* Need space for new headers */ | |
448 | if (skb_cow_head(skb, dev->needed_headroom - | |
2bac7cb3 | 449 | (tunnel->hlen + sizeof(struct iphdr)))) |
c5441932 | 450 | goto free_skb; |
1da177e4 | 451 | |
c5441932 | 452 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 453 | |
c5441932 PS |
454 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
455 | * to gre header. | |
456 | */ | |
457 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); | |
458 | } else { | |
459 | if (skb_cow_head(skb, dev->needed_headroom)) | |
460 | goto free_skb; | |
1da177e4 | 461 | |
c5441932 | 462 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
463 | } |
464 | ||
c5441932 PS |
465 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
466 | ||
6ed10654 | 467 | return NETDEV_TX_OK; |
1da177e4 | 468 | |
c5441932 | 469 | free_skb: |
1da177e4 | 470 | dev_kfree_skb(skb); |
c5441932 PS |
471 | out: |
472 | dev->stats.tx_dropped++; | |
6ed10654 | 473 | return NETDEV_TX_OK; |
1da177e4 LT |
474 | } |
475 | ||
c5441932 PS |
476 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
477 | struct net_device *dev) | |
ee34c1eb | 478 | { |
c5441932 | 479 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 480 | |
c5441932 PS |
481 | skb = handle_offloads(tunnel, skb); |
482 | if (IS_ERR(skb)) | |
483 | goto out; | |
ee34c1eb | 484 | |
c5441932 PS |
485 | if (skb_cow_head(skb, dev->needed_headroom)) |
486 | goto free_skb; | |
42aa9162 | 487 | |
c5441932 | 488 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
42aa9162 | 489 | |
c5441932 | 490 | return NETDEV_TX_OK; |
ee34c1eb | 491 | |
c5441932 PS |
492 | free_skb: |
493 | dev_kfree_skb(skb); | |
494 | out: | |
495 | dev->stats.tx_dropped++; | |
496 | return NETDEV_TX_OK; | |
ee34c1eb MS |
497 | } |
498 | ||
c5441932 PS |
499 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
500 | struct ifreq *ifr, int cmd) | |
1da177e4 LT |
501 | { |
502 | int err = 0; | |
503 | struct ip_tunnel_parm p; | |
1da177e4 | 504 | |
c5441932 PS |
505 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
506 | return -EFAULT; | |
3d3fa8bc CW |
507 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
508 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
509 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
510 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
511 | return -EINVAL; | |
1da177e4 | 512 | } |
c5441932 PS |
513 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
514 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); | |
1da177e4 | 515 | |
c5441932 PS |
516 | err = ip_tunnel_ioctl(dev, &p, cmd); |
517 | if (err) | |
518 | return err; | |
1da177e4 | 519 | |
c5441932 PS |
520 | p.i_flags = tnl_flags_to_gre_flags(p.i_flags); |
521 | p.o_flags = tnl_flags_to_gre_flags(p.o_flags); | |
522 | ||
523 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
524 | return -EFAULT; | |
1da177e4 LT |
525 | return 0; |
526 | } | |
527 | ||
1da177e4 LT |
528 | /* Nice toy. Unfortunately, useless in real life :-) |
529 | It allows to construct virtual multiprotocol broadcast "LAN" | |
530 | over the Internet, provided multicast routing is tuned. | |
531 | ||
532 | ||
533 | I have no idea was this bicycle invented before me, | |
534 | so that I had to set ARPHRD_IPGRE to a random value. | |
535 | I have an impression, that Cisco could make something similar, | |
536 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 537 | |
1da177e4 LT |
538 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
539 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
540 | ||
541 | ping -t 255 224.66.66.66 | |
542 | ||
543 | If nobody answers, mbone does not work. | |
544 | ||
545 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
546 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
547 | ifconfig Universe up | |
548 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
549 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
550 | ftp 10.66.66.66 | |
551 | ... | |
552 | ftp fec0:6666:6666::193.233.7.65 | |
553 | ... | |
1da177e4 | 554 | */ |
3b04ddde SH |
555 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
556 | unsigned short type, | |
1507850b | 557 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 558 | { |
2941a486 | 559 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
560 | struct iphdr *iph; |
561 | struct gre_base_hdr *greh; | |
1da177e4 | 562 | |
c5441932 PS |
563 | iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph)); |
564 | greh = (struct gre_base_hdr *)(iph+1); | |
565 | greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags); | |
566 | greh->protocol = htons(type); | |
1da177e4 | 567 | |
c5441932 | 568 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 569 | |
c5441932 | 570 | /* Set the source hardware address. */ |
1da177e4 LT |
571 | if (saddr) |
572 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 573 | if (daddr) |
1da177e4 | 574 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 575 | if (iph->daddr) |
27c1c98b | 576 | return t->hlen + sizeof(*iph); |
e905a9ed | 577 | |
c5441932 | 578 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
579 | } |
580 | ||
6a5f44d7 TT |
581 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
582 | { | |
b71d1d42 | 583 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
584 | memcpy(haddr, &iph->saddr, 4); |
585 | return 4; | |
586 | } | |
587 | ||
3b04ddde SH |
588 | static const struct header_ops ipgre_header_ops = { |
589 | .create = ipgre_header, | |
6a5f44d7 | 590 | .parse = ipgre_header_parse, |
3b04ddde SH |
591 | }; |
592 | ||
6a5f44d7 | 593 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
594 | static int ipgre_open(struct net_device *dev) |
595 | { | |
2941a486 | 596 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 597 | |
f97c1e0c | 598 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
599 | struct flowi4 fl4; |
600 | struct rtable *rt; | |
601 | ||
602 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
603 | t->parms.iph.daddr, | |
604 | t->parms.iph.saddr, | |
605 | t->parms.o_key, | |
606 | RT_TOS(t->parms.iph.tos), | |
607 | t->parms.link); | |
b23dd4fe | 608 | if (IS_ERR(rt)) |
1da177e4 | 609 | return -EADDRNOTAVAIL; |
d8d1f30b | 610 | dev = rt->dst.dev; |
1da177e4 | 611 | ip_rt_put(rt); |
e5ed6399 | 612 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
613 | return -EADDRNOTAVAIL; |
614 | t->mlink = dev->ifindex; | |
e5ed6399 | 615 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
616 | } |
617 | return 0; | |
618 | } | |
619 | ||
620 | static int ipgre_close(struct net_device *dev) | |
621 | { | |
2941a486 | 622 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 623 | |
f97c1e0c | 624 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 625 | struct in_device *in_dev; |
c346dca1 | 626 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
8723e1b4 | 627 | if (in_dev) |
1da177e4 | 628 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
629 | } |
630 | return 0; | |
631 | } | |
1da177e4 LT |
632 | #endif |
633 | ||
b8c26a33 SH |
634 | static const struct net_device_ops ipgre_netdev_ops = { |
635 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 636 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
637 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
638 | .ndo_open = ipgre_open, | |
639 | .ndo_stop = ipgre_close, | |
640 | #endif | |
c5441932 | 641 | .ndo_start_xmit = ipgre_xmit, |
b8c26a33 | 642 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
c5441932 PS |
643 | .ndo_change_mtu = ip_tunnel_change_mtu, |
644 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
b8c26a33 SH |
645 | }; |
646 | ||
6b78f16e ED |
647 | #define GRE_FEATURES (NETIF_F_SG | \ |
648 | NETIF_F_FRAGLIST | \ | |
649 | NETIF_F_HIGHDMA | \ | |
650 | NETIF_F_HW_CSUM) | |
651 | ||
1da177e4 LT |
652 | static void ipgre_tunnel_setup(struct net_device *dev) |
653 | { | |
b8c26a33 | 654 | dev->netdev_ops = &ipgre_netdev_ops; |
5ef58c40 | 655 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
656 | ip_tunnel_setup(dev, ipgre_net_id); |
657 | } | |
1da177e4 | 658 | |
c5441932 PS |
659 | static void __gre_tunnel_init(struct net_device *dev) |
660 | { | |
661 | struct ip_tunnel *tunnel; | |
662 | ||
663 | tunnel = netdev_priv(dev); | |
664 | tunnel->hlen = ip_gre_calc_hlen(tunnel->parms.o_flags); | |
665 | tunnel->parms.iph.protocol = IPPROTO_GRE; | |
666 | ||
667 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; | |
46f25dff | 668 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
6b78f16e | 669 | |
c5441932 | 670 | dev->features |= NETIF_F_NETNS_LOCAL | GRE_FEATURES; |
6b78f16e | 671 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
672 | |
673 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
674 | /* TCP offload with GRE SEQ is not supported. */ | |
675 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
676 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
677 | /* Can use a lockless transmit, unless we generate | |
678 | * output sequences | |
679 | */ | |
680 | dev->features |= NETIF_F_LLTX; | |
681 | } | |
1da177e4 LT |
682 | } |
683 | ||
684 | static int ipgre_tunnel_init(struct net_device *dev) | |
685 | { | |
c5441932 PS |
686 | struct ip_tunnel *tunnel = netdev_priv(dev); |
687 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 688 | |
c5441932 | 689 | __gre_tunnel_init(dev); |
1da177e4 | 690 | |
c5441932 PS |
691 | memcpy(dev->dev_addr, &iph->saddr, 4); |
692 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 693 | |
c5441932 PS |
694 | dev->flags = IFF_NOARP; |
695 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
696 | dev->addr_len = 4; | |
1da177e4 | 697 | |
1da177e4 | 698 | if (iph->daddr) { |
1da177e4 | 699 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 700 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
701 | if (!iph->saddr) |
702 | return -EINVAL; | |
703 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 704 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
705 | } |
706 | #endif | |
ee34c1eb | 707 | } else |
6a5f44d7 | 708 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 709 | |
c5441932 | 710 | return ip_tunnel_init(dev); |
1da177e4 LT |
711 | } |
712 | ||
00959ade DK |
713 | static const struct gre_protocol ipgre_protocol = { |
714 | .handler = ipgre_rcv, | |
715 | .err_handler = ipgre_err, | |
1da177e4 LT |
716 | }; |
717 | ||
2c8c1e72 | 718 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 719 | { |
c5441932 | 720 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
721 | } |
722 | ||
2c8c1e72 | 723 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 | 724 | { |
c5441932 PS |
725 | struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id); |
726 | ip_tunnel_delete_net(itn); | |
59a4c759 PE |
727 | } |
728 | ||
729 | static struct pernet_operations ipgre_net_ops = { | |
730 | .init = ipgre_init_net, | |
731 | .exit = ipgre_exit_net, | |
cfb8fbf2 | 732 | .id = &ipgre_net_id, |
c5441932 | 733 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 734 | }; |
1da177e4 | 735 | |
c19e654d HX |
736 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
737 | { | |
738 | __be16 flags; | |
739 | ||
740 | if (!data) | |
741 | return 0; | |
742 | ||
743 | flags = 0; | |
744 | if (data[IFLA_GRE_IFLAGS]) | |
745 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
746 | if (data[IFLA_GRE_OFLAGS]) | |
747 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
748 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
749 | return -EINVAL; | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
e1a80002 HX |
754 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
755 | { | |
756 | __be32 daddr; | |
757 | ||
758 | if (tb[IFLA_ADDRESS]) { | |
759 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
760 | return -EINVAL; | |
761 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
762 | return -EADDRNOTAVAIL; | |
763 | } | |
764 | ||
765 | if (!data) | |
766 | goto out; | |
767 | ||
768 | if (data[IFLA_GRE_REMOTE]) { | |
769 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
770 | if (!daddr) | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | out: | |
775 | return ipgre_tunnel_validate(tb, data); | |
776 | } | |
777 | ||
c5441932 PS |
778 | static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[], |
779 | struct ip_tunnel_parm *parms) | |
c19e654d | 780 | { |
7bb82d92 | 781 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
782 | |
783 | parms->iph.protocol = IPPROTO_GRE; | |
784 | ||
785 | if (!data) | |
786 | return; | |
787 | ||
788 | if (data[IFLA_GRE_LINK]) | |
789 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
790 | ||
791 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 792 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
793 | |
794 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 795 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
796 | |
797 | if (data[IFLA_GRE_IKEY]) | |
798 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
799 | ||
800 | if (data[IFLA_GRE_OKEY]) | |
801 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
802 | ||
803 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 804 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
805 | |
806 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 807 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
808 | |
809 | if (data[IFLA_GRE_TTL]) | |
810 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
811 | ||
812 | if (data[IFLA_GRE_TOS]) | |
813 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
814 | ||
815 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
816 | parms->iph.frag_off = htons(IP_DF); | |
817 | } | |
818 | ||
c5441932 | 819 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 820 | { |
c5441932 | 821 | __gre_tunnel_init(dev); |
e1a80002 | 822 | |
c5441932 | 823 | return ip_tunnel_init(dev); |
e1a80002 HX |
824 | } |
825 | ||
c5441932 PS |
826 | static const struct net_device_ops gre_tap_netdev_ops = { |
827 | .ndo_init = gre_tap_init, | |
828 | .ndo_uninit = ip_tunnel_uninit, | |
829 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
830 | .ndo_set_mac_address = eth_mac_addr, |
831 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 PS |
832 | .ndo_change_mtu = ip_tunnel_change_mtu, |
833 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
b8c26a33 SH |
834 | }; |
835 | ||
e1a80002 HX |
836 | static void ipgre_tap_setup(struct net_device *dev) |
837 | { | |
e1a80002 | 838 | ether_setup(dev); |
c5441932 PS |
839 | dev->netdev_ops = &gre_tap_netdev_ops; |
840 | ip_tunnel_setup(dev, gre_tap_net_id); | |
e1a80002 HX |
841 | } |
842 | ||
c5441932 PS |
843 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
844 | struct nlattr *tb[], struct nlattr *data[]) | |
c19e654d | 845 | { |
c5441932 | 846 | struct ip_tunnel_parm p; |
c19e654d | 847 | |
c5441932 PS |
848 | ipgre_netlink_parms(data, tb, &p); |
849 | return ip_tunnel_newlink(dev, tb, &p); | |
c19e654d HX |
850 | } |
851 | ||
852 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
853 | struct nlattr *data[]) | |
854 | { | |
c19e654d | 855 | struct ip_tunnel_parm p; |
c19e654d | 856 | |
c5441932 PS |
857 | ipgre_netlink_parms(data, tb, &p); |
858 | return ip_tunnel_changelink(dev, tb, &p); | |
c19e654d HX |
859 | } |
860 | ||
861 | static size_t ipgre_get_size(const struct net_device *dev) | |
862 | { | |
863 | return | |
864 | /* IFLA_GRE_LINK */ | |
865 | nla_total_size(4) + | |
866 | /* IFLA_GRE_IFLAGS */ | |
867 | nla_total_size(2) + | |
868 | /* IFLA_GRE_OFLAGS */ | |
869 | nla_total_size(2) + | |
870 | /* IFLA_GRE_IKEY */ | |
871 | nla_total_size(4) + | |
872 | /* IFLA_GRE_OKEY */ | |
873 | nla_total_size(4) + | |
874 | /* IFLA_GRE_LOCAL */ | |
875 | nla_total_size(4) + | |
876 | /* IFLA_GRE_REMOTE */ | |
877 | nla_total_size(4) + | |
878 | /* IFLA_GRE_TTL */ | |
879 | nla_total_size(1) + | |
880 | /* IFLA_GRE_TOS */ | |
881 | nla_total_size(1) + | |
882 | /* IFLA_GRE_PMTUDISC */ | |
883 | nla_total_size(1) + | |
884 | 0; | |
885 | } | |
886 | ||
887 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
888 | { | |
889 | struct ip_tunnel *t = netdev_priv(dev); | |
890 | struct ip_tunnel_parm *p = &t->parms; | |
891 | ||
f3756b79 | 892 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
c5441932 PS |
893 | nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) || |
894 | nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) || | |
f3756b79 DM |
895 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
896 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
897 | nla_put_be32(skb, IFLA_GRE_LOCAL, p->iph.saddr) || | |
898 | nla_put_be32(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
899 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || | |
900 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
901 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
902 | !!(p->iph.frag_off & htons(IP_DF)))) | |
903 | goto nla_put_failure; | |
c19e654d HX |
904 | return 0; |
905 | ||
906 | nla_put_failure: | |
907 | return -EMSGSIZE; | |
908 | } | |
909 | ||
910 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
911 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
912 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
913 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
914 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
915 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
916 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
917 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
918 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
919 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
920 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
921 | }; | |
922 | ||
923 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
924 | .kind = "gre", | |
925 | .maxtype = IFLA_GRE_MAX, | |
926 | .policy = ipgre_policy, | |
927 | .priv_size = sizeof(struct ip_tunnel), | |
928 | .setup = ipgre_tunnel_setup, | |
929 | .validate = ipgre_tunnel_validate, | |
930 | .newlink = ipgre_newlink, | |
931 | .changelink = ipgre_changelink, | |
c5441932 | 932 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
933 | .get_size = ipgre_get_size, |
934 | .fill_info = ipgre_fill_info, | |
935 | }; | |
936 | ||
e1a80002 HX |
937 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
938 | .kind = "gretap", | |
939 | .maxtype = IFLA_GRE_MAX, | |
940 | .policy = ipgre_policy, | |
941 | .priv_size = sizeof(struct ip_tunnel), | |
942 | .setup = ipgre_tap_setup, | |
943 | .validate = ipgre_tap_validate, | |
944 | .newlink = ipgre_newlink, | |
945 | .changelink = ipgre_changelink, | |
c5441932 | 946 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
947 | .get_size = ipgre_get_size, |
948 | .fill_info = ipgre_fill_info, | |
949 | }; | |
950 | ||
c5441932 PS |
951 | static int __net_init ipgre_tap_init_net(struct net *net) |
952 | { | |
953 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, NULL); | |
954 | } | |
955 | ||
956 | static void __net_exit ipgre_tap_exit_net(struct net *net) | |
957 | { | |
958 | struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id); | |
959 | ip_tunnel_delete_net(itn); | |
960 | } | |
961 | ||
962 | static struct pernet_operations ipgre_tap_net_ops = { | |
963 | .init = ipgre_tap_init_net, | |
964 | .exit = ipgre_tap_exit_net, | |
965 | .id = &gre_tap_net_id, | |
966 | .size = sizeof(struct ip_tunnel_net), | |
967 | }; | |
1da177e4 LT |
968 | |
969 | static int __init ipgre_init(void) | |
970 | { | |
971 | int err; | |
972 | ||
058bd4d2 | 973 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 974 | |
cfb8fbf2 | 975 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 976 | if (err < 0) |
c2892f02 AD |
977 | return err; |
978 | ||
c5441932 PS |
979 | err = register_pernet_device(&ipgre_tap_net_ops); |
980 | if (err < 0) | |
981 | goto pnet_tap_faied; | |
982 | ||
00959ade | 983 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 984 | if (err < 0) { |
058bd4d2 | 985 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
986 | goto add_proto_failed; |
987 | } | |
7daa0004 | 988 | |
c19e654d HX |
989 | err = rtnl_link_register(&ipgre_link_ops); |
990 | if (err < 0) | |
991 | goto rtnl_link_failed; | |
992 | ||
e1a80002 HX |
993 | err = rtnl_link_register(&ipgre_tap_ops); |
994 | if (err < 0) | |
995 | goto tap_ops_failed; | |
996 | ||
c5441932 | 997 | return 0; |
c19e654d | 998 | |
e1a80002 HX |
999 | tap_ops_failed: |
1000 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1001 | rtnl_link_failed: |
00959ade | 1002 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1003 | add_proto_failed: |
c5441932 PS |
1004 | unregister_pernet_device(&ipgre_tap_net_ops); |
1005 | pnet_tap_faied: | |
c2892f02 | 1006 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1007 | return err; |
1da177e4 LT |
1008 | } |
1009 | ||
db44575f | 1010 | static void __exit ipgre_fini(void) |
1da177e4 | 1011 | { |
e1a80002 | 1012 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1013 | rtnl_link_unregister(&ipgre_link_ops); |
00959ade | 1014 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
058bd4d2 | 1015 | pr_info("%s: can't remove protocol\n", __func__); |
c5441932 | 1016 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1017 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | module_init(ipgre_init); | |
1021 | module_exit(ipgre_fini); | |
1022 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1023 | MODULE_ALIAS_RTNL_LINK("gre"); |
1024 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1025 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1026 | MODULE_ALIAS_NETDEV("gretap0"); |