Commit | Line | Data |
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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> | |
2e15ea39 | 27 | #include <linux/if_vlan.h> |
1da177e4 LT |
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> |
2e15ea39 | 50 | #include <net/dst_metadata.h> |
1da177e4 | 51 | |
dfd56b8b | 52 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
53 | #include <net/ipv6.h> |
54 | #include <net/ip6_fib.h> | |
55 | #include <net/ip6_route.h> | |
56 | #endif | |
57 | ||
58 | /* | |
59 | Problems & solutions | |
60 | -------------------- | |
61 | ||
62 | 1. The most important issue is detecting local dead loops. | |
63 | They would cause complete host lockup in transmit, which | |
64 | would be "resolved" by stack overflow or, if queueing is enabled, | |
65 | with infinite looping in net_bh. | |
66 | ||
67 | We cannot track such dead loops during route installation, | |
68 | it is infeasible task. The most general solutions would be | |
69 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 70 | and silently drop packet when it expires. It is a good |
bff52857 | 71 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
72 | skb, even if no tunneling is used. |
73 | ||
6d0722a2 ED |
74 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
75 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
76 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
77 | |
78 | 2. Networking dead loops would not kill routers, but would really | |
79 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
80 | if we copy it from packet being encapsulated to upper header. | |
81 | It is very good solution, but it introduces two problems: | |
82 | ||
83 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
84 | do not work over tunnels. | |
85 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
86 | so that this problem would be solved and traceroute output | |
87 | would even more informative. This idea appeared to be wrong: | |
88 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
89 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
90 | return only 8 bytes of payload. It is the end. | |
91 | ||
92 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
93 | we should search for another solution. | |
94 | ||
95 | One of them is to parse packet trying to detect inner encapsulation | |
96 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 97 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
98 | |
99 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
100 | We force DF flag on tunnels with preconfigured hop limit, | |
101 | that is ALL. :-) Well, it does not remove the problem completely, | |
102 | but exponential growth of network traffic is changed to linear | |
103 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 104 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
105 | Yes, it is not good if there exists a router in the loop, |
106 | which does not force DF, even when encapsulating packets have DF set. | |
107 | But it is not our problem! Nobody could accuse us, we made | |
108 | all that we could make. Even if it is your gated who injected | |
109 | fatal route to network, even if it were you who configured | |
110 | fatal static route: you are innocent. :-) | |
111 | ||
1da177e4 LT |
112 | Alexey Kuznetsov. |
113 | */ | |
114 | ||
eccc1bb8 | 115 | static bool log_ecn_error = true; |
116 | module_param(log_ecn_error, bool, 0644); | |
117 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
118 | ||
c19e654d | 119 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 | 120 | static int ipgre_tunnel_init(struct net_device *dev); |
eb8ce741 | 121 | |
f99189b1 | 122 | static int ipgre_net_id __read_mostly; |
c5441932 | 123 | static int gre_tap_net_id __read_mostly; |
1da177e4 | 124 | |
9f57c67c PS |
125 | static int ip_gre_calc_hlen(__be16 o_flags) |
126 | { | |
127 | int addend = 4; | |
128 | ||
129 | if (o_flags & TUNNEL_CSUM) | |
130 | addend += 4; | |
131 | if (o_flags & TUNNEL_KEY) | |
132 | addend += 4; | |
133 | if (o_flags & TUNNEL_SEQ) | |
134 | addend += 4; | |
135 | return addend; | |
136 | } | |
137 | ||
138 | static __be16 gre_flags_to_tnl_flags(__be16 flags) | |
139 | { | |
140 | __be16 tflags = 0; | |
141 | ||
142 | if (flags & GRE_CSUM) | |
143 | tflags |= TUNNEL_CSUM; | |
144 | if (flags & GRE_ROUTING) | |
145 | tflags |= TUNNEL_ROUTING; | |
146 | if (flags & GRE_KEY) | |
147 | tflags |= TUNNEL_KEY; | |
148 | if (flags & GRE_SEQ) | |
149 | tflags |= TUNNEL_SEQ; | |
150 | if (flags & GRE_STRICT) | |
151 | tflags |= TUNNEL_STRICT; | |
152 | if (flags & GRE_REC) | |
153 | tflags |= TUNNEL_REC; | |
154 | if (flags & GRE_VERSION) | |
155 | tflags |= TUNNEL_VERSION; | |
156 | ||
157 | return tflags; | |
158 | } | |
159 | ||
160 | static __be16 tnl_flags_to_gre_flags(__be16 tflags) | |
161 | { | |
162 | __be16 flags = 0; | |
163 | ||
164 | if (tflags & TUNNEL_CSUM) | |
165 | flags |= GRE_CSUM; | |
166 | if (tflags & TUNNEL_ROUTING) | |
167 | flags |= GRE_ROUTING; | |
168 | if (tflags & TUNNEL_KEY) | |
169 | flags |= GRE_KEY; | |
170 | if (tflags & TUNNEL_SEQ) | |
171 | flags |= GRE_SEQ; | |
172 | if (tflags & TUNNEL_STRICT) | |
173 | flags |= GRE_STRICT; | |
174 | if (tflags & TUNNEL_REC) | |
175 | flags |= GRE_REC; | |
176 | if (tflags & TUNNEL_VERSION) | |
177 | flags |= GRE_VERSION; | |
178 | ||
179 | return flags; | |
180 | } | |
181 | ||
b7f8fe25 | 182 | /* Fills in tpi and returns header length to be pulled. */ |
9f57c67c PS |
183 | static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
184 | bool *csum_err) | |
185 | { | |
186 | const struct gre_base_hdr *greh; | |
187 | __be32 *options; | |
188 | int hdr_len; | |
189 | ||
190 | if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr)))) | |
191 | return -EINVAL; | |
192 | ||
193 | greh = (struct gre_base_hdr *)skb_transport_header(skb); | |
194 | if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING))) | |
195 | return -EINVAL; | |
196 | ||
197 | tpi->flags = gre_flags_to_tnl_flags(greh->flags); | |
198 | hdr_len = ip_gre_calc_hlen(tpi->flags); | |
199 | ||
200 | if (!pskb_may_pull(skb, hdr_len)) | |
201 | return -EINVAL; | |
202 | ||
203 | greh = (struct gre_base_hdr *)skb_transport_header(skb); | |
204 | tpi->proto = greh->protocol; | |
205 | ||
206 | options = (__be32 *)(greh + 1); | |
207 | if (greh->flags & GRE_CSUM) { | |
208 | if (skb_checksum_simple_validate(skb)) { | |
209 | *csum_err = true; | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | skb_checksum_try_convert(skb, IPPROTO_GRE, 0, | |
214 | null_compute_pseudo); | |
215 | options++; | |
216 | } | |
217 | ||
218 | if (greh->flags & GRE_KEY) { | |
219 | tpi->key = *options; | |
220 | options++; | |
221 | } else { | |
222 | tpi->key = 0; | |
223 | } | |
224 | if (unlikely(greh->flags & GRE_SEQ)) { | |
225 | tpi->seq = *options; | |
226 | options++; | |
227 | } else { | |
228 | tpi->seq = 0; | |
229 | } | |
230 | /* WCCP version 1 and 2 protocol decoding. | |
231 | * - Change protocol to IP | |
232 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
233 | */ | |
234 | if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) { | |
235 | tpi->proto = htons(ETH_P_IP); | |
236 | if ((*(u8 *)options & 0xF0) != 0x40) { | |
237 | hdr_len += 4; | |
238 | if (!pskb_may_pull(skb, hdr_len)) | |
239 | return -EINVAL; | |
240 | } | |
241 | } | |
b7f8fe25 | 242 | return hdr_len; |
9f57c67c PS |
243 | } |
244 | ||
245 | static void ipgre_err(struct sk_buff *skb, u32 info, | |
246 | const struct tnl_ptk_info *tpi) | |
1da177e4 | 247 | { |
1da177e4 | 248 | |
c5441932 PS |
249 | /* All the routers (except for Linux) return only |
250 | 8 bytes of packet payload. It means, that precise relaying of | |
251 | ICMP in the real Internet is absolutely infeasible. | |
1da177e4 | 252 | |
c5441932 PS |
253 | Moreover, Cisco "wise men" put GRE key to the third word |
254 | in GRE header. It makes impossible maintaining even soft | |
255 | state for keyed GRE tunnels with enabled checksum. Tell | |
256 | them "thank you". | |
1da177e4 | 257 | |
c5441932 PS |
258 | Well, I wonder, rfc1812 was written by Cisco employee, |
259 | what the hell these idiots break standards established | |
260 | by themselves??? | |
261 | */ | |
262 | struct net *net = dev_net(skb->dev); | |
263 | struct ip_tunnel_net *itn; | |
96f5a846 | 264 | const struct iphdr *iph; |
88c7664f ACM |
265 | const int type = icmp_hdr(skb)->type; |
266 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 267 | struct ip_tunnel *t; |
1da177e4 | 268 | |
1da177e4 LT |
269 | switch (type) { |
270 | default: | |
271 | case ICMP_PARAMETERPROB: | |
9f57c67c | 272 | return; |
1da177e4 LT |
273 | |
274 | case ICMP_DEST_UNREACH: | |
275 | switch (code) { | |
276 | case ICMP_SR_FAILED: | |
277 | case ICMP_PORT_UNREACH: | |
278 | /* Impossible event. */ | |
9f57c67c | 279 | return; |
1da177e4 LT |
280 | default: |
281 | /* All others are translated to HOST_UNREACH. | |
282 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
283 | I believe they are just ether pollution. --ANK | |
284 | */ | |
285 | break; | |
286 | } | |
287 | break; | |
9f57c67c | 288 | |
1da177e4 LT |
289 | case ICMP_TIME_EXCEEDED: |
290 | if (code != ICMP_EXC_TTL) | |
9f57c67c | 291 | return; |
1da177e4 | 292 | break; |
55be7a9c DM |
293 | |
294 | case ICMP_REDIRECT: | |
295 | break; | |
1da177e4 LT |
296 | } |
297 | ||
bda7bb46 | 298 | if (tpi->proto == htons(ETH_P_TEB)) |
c5441932 PS |
299 | itn = net_generic(net, gre_tap_net_id); |
300 | else | |
301 | itn = net_generic(net, ipgre_net_id); | |
302 | ||
c0c0c50f | 303 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
bda7bb46 PS |
304 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
305 | iph->daddr, iph->saddr, tpi->key); | |
d2083287 | 306 | |
51456b29 | 307 | if (!t) |
9f57c67c | 308 | return; |
36393395 | 309 | |
36393395 | 310 | if (t->parms.iph.daddr == 0 || |
f97c1e0c | 311 | ipv4_is_multicast(t->parms.iph.daddr)) |
9f57c67c | 312 | return; |
1da177e4 LT |
313 | |
314 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
9f57c67c | 315 | return; |
1da177e4 | 316 | |
da6185d8 | 317 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
318 | t->err_count++; |
319 | else | |
320 | t->err_count = 1; | |
321 | t->err_time = jiffies; | |
9f57c67c PS |
322 | } |
323 | ||
324 | static void gre_err(struct sk_buff *skb, u32 info) | |
325 | { | |
326 | /* All the routers (except for Linux) return only | |
327 | * 8 bytes of packet payload. It means, that precise relaying of | |
328 | * ICMP in the real Internet is absolutely infeasible. | |
329 | * | |
330 | * Moreover, Cisco "wise men" put GRE key to the third word | |
331 | * in GRE header. It makes impossible maintaining even soft | |
332 | * state for keyed | |
333 | * GRE tunnels with enabled checksum. Tell them "thank you". | |
334 | * | |
335 | * Well, I wonder, rfc1812 was written by Cisco employee, | |
336 | * what the hell these idiots break standards established | |
337 | * by themselves??? | |
338 | */ | |
339 | ||
340 | const int type = icmp_hdr(skb)->type; | |
341 | const int code = icmp_hdr(skb)->code; | |
342 | struct tnl_ptk_info tpi; | |
343 | bool csum_err = false; | |
344 | ||
b7f8fe25 | 345 | if (parse_gre_header(skb, &tpi, &csum_err) < 0) { |
9f57c67c PS |
346 | if (!csum_err) /* ignore csum errors. */ |
347 | return; | |
348 | } | |
349 | ||
350 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
351 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
352 | skb->dev->ifindex, 0, IPPROTO_GRE, 0); | |
353 | return; | |
354 | } | |
355 | if (type == ICMP_REDIRECT) { | |
356 | ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0, | |
357 | IPPROTO_GRE, 0); | |
358 | return; | |
359 | } | |
360 | ||
361 | ipgre_err(skb, info, &tpi); | |
1da177e4 LT |
362 | } |
363 | ||
2e15ea39 PS |
364 | static __be64 key_to_tunnel_id(__be32 key) |
365 | { | |
366 | #ifdef __BIG_ENDIAN | |
367 | return (__force __be64)((__force u32)key); | |
368 | #else | |
369 | return (__force __be64)((__force u64)key << 32); | |
370 | #endif | |
371 | } | |
372 | ||
373 | /* Returns the least-significant 32 bits of a __be64. */ | |
374 | static __be32 tunnel_id_to_key(__be64 x) | |
375 | { | |
376 | #ifdef __BIG_ENDIAN | |
377 | return (__force __be32)x; | |
378 | #else | |
379 | return (__force __be32)((__force u64)x >> 32); | |
380 | #endif | |
381 | } | |
382 | ||
bda7bb46 | 383 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) |
1da177e4 | 384 | { |
c5441932 | 385 | struct net *net = dev_net(skb->dev); |
2e15ea39 | 386 | struct metadata_dst *tun_dst = NULL; |
c5441932 | 387 | struct ip_tunnel_net *itn; |
b71d1d42 | 388 | const struct iphdr *iph; |
1da177e4 | 389 | struct ip_tunnel *tunnel; |
1da177e4 | 390 | |
bda7bb46 | 391 | if (tpi->proto == htons(ETH_P_TEB)) |
c5441932 PS |
392 | itn = net_generic(net, gre_tap_net_id); |
393 | else | |
394 | itn = net_generic(net, ipgre_net_id); | |
1da177e4 | 395 | |
c5441932 | 396 | iph = ip_hdr(skb); |
bda7bb46 PS |
397 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
398 | iph->saddr, iph->daddr, tpi->key); | |
e1a80002 | 399 | |
d2083287 | 400 | if (tunnel) { |
0e3da5bb | 401 | skb_pop_mac_header(skb); |
2e15ea39 | 402 | if (tunnel->collect_md) { |
c29a70d2 PS |
403 | __be16 flags; |
404 | __be64 tun_id; | |
2e15ea39 | 405 | |
c29a70d2 PS |
406 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
407 | tun_id = key_to_tunnel_id(tpi->key); | |
408 | tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); | |
2e15ea39 PS |
409 | if (!tun_dst) |
410 | return PACKET_REJECT; | |
2e15ea39 PS |
411 | } |
412 | ||
413 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
bda7bb46 | 414 | return PACKET_RCVD; |
1da177e4 | 415 | } |
bda7bb46 | 416 | return PACKET_REJECT; |
1da177e4 LT |
417 | } |
418 | ||
9f57c67c PS |
419 | static int gre_rcv(struct sk_buff *skb) |
420 | { | |
421 | struct tnl_ptk_info tpi; | |
422 | bool csum_err = false; | |
b7f8fe25 | 423 | int hdr_len; |
9f57c67c PS |
424 | |
425 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
426 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { | |
427 | /* Looped back packet, drop it! */ | |
428 | if (rt_is_output_route(skb_rtable(skb))) | |
429 | goto drop; | |
430 | } | |
431 | #endif | |
432 | ||
b7f8fe25 JB |
433 | hdr_len = parse_gre_header(skb, &tpi, &csum_err); |
434 | if (hdr_len < 0) | |
435 | goto drop; | |
436 | if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false) < 0) | |
9f57c67c PS |
437 | goto drop; |
438 | ||
439 | if (ipgre_rcv(skb, &tpi) == PACKET_RCVD) | |
440 | return 0; | |
441 | ||
442 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
443 | drop: | |
444 | kfree_skb(skb); | |
445 | return 0; | |
446 | } | |
447 | ||
53936107 EC |
448 | static __sum16 gre_checksum(struct sk_buff *skb) |
449 | { | |
450 | __wsum csum; | |
451 | ||
452 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
453 | csum = lco_csum(skb); | |
454 | else | |
455 | csum = skb_checksum(skb, 0, skb->len, 0); | |
456 | return csum_fold(csum); | |
457 | } | |
458 | ||
2e15ea39 PS |
459 | static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags, |
460 | __be16 proto, __be32 key, __be32 seq) | |
461 | { | |
462 | struct gre_base_hdr *greh; | |
463 | ||
464 | skb_push(skb, hdr_len); | |
465 | ||
466 | skb_reset_transport_header(skb); | |
467 | greh = (struct gre_base_hdr *)skb->data; | |
468 | greh->flags = tnl_flags_to_gre_flags(flags); | |
469 | greh->protocol = proto; | |
470 | ||
471 | if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) { | |
472 | __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4); | |
473 | ||
474 | if (flags & TUNNEL_SEQ) { | |
475 | *ptr = seq; | |
476 | ptr--; | |
477 | } | |
478 | if (flags & TUNNEL_KEY) { | |
479 | *ptr = key; | |
480 | ptr--; | |
481 | } | |
482 | if (flags & TUNNEL_CSUM && | |
483 | !(skb_shinfo(skb)->gso_type & | |
484 | (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) { | |
485 | *ptr = 0; | |
53936107 | 486 | *(__sum16 *)ptr = gre_checksum(skb); |
2e15ea39 PS |
487 | } |
488 | } | |
489 | } | |
490 | ||
c5441932 PS |
491 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
492 | const struct iphdr *tnl_params, | |
493 | __be16 proto) | |
494 | { | |
495 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1da177e4 | 496 | |
c5441932 PS |
497 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
498 | tunnel->o_seqno++; | |
1da177e4 | 499 | |
c5441932 | 500 | /* Push GRE header. */ |
2e15ea39 PS |
501 | build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, |
502 | proto, tunnel->parms.o_key, htonl(tunnel->o_seqno)); | |
54bc9bac | 503 | |
2e15ea39 | 504 | skb_set_inner_protocol(skb, proto); |
bf3d6a8f | 505 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
c5441932 | 506 | } |
1da177e4 | 507 | |
b2acd1dc PS |
508 | static struct sk_buff *gre_handle_offloads(struct sk_buff *skb, |
509 | bool csum) | |
510 | { | |
6fa79666 | 511 | return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
b2acd1dc PS |
512 | } |
513 | ||
fc4099f1 PS |
514 | static struct rtable *gre_get_rt(struct sk_buff *skb, |
515 | struct net_device *dev, | |
516 | struct flowi4 *fl, | |
517 | const struct ip_tunnel_key *key) | |
518 | { | |
519 | struct net *net = dev_net(dev); | |
520 | ||
521 | memset(fl, 0, sizeof(*fl)); | |
522 | fl->daddr = key->u.ipv4.dst; | |
523 | fl->saddr = key->u.ipv4.src; | |
524 | fl->flowi4_tos = RT_TOS(key->tos); | |
525 | fl->flowi4_mark = skb->mark; | |
526 | fl->flowi4_proto = IPPROTO_GRE; | |
527 | ||
528 | return ip_route_output_key(net, fl); | |
529 | } | |
530 | ||
2090714e JB |
531 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
532 | __be16 proto) | |
2e15ea39 PS |
533 | { |
534 | struct ip_tunnel_info *tun_info; | |
2e15ea39 | 535 | const struct ip_tunnel_key *key; |
db3c6139 | 536 | struct rtable *rt = NULL; |
2e15ea39 | 537 | struct flowi4 fl; |
2e15ea39 PS |
538 | int min_headroom; |
539 | int tunnel_hlen; | |
540 | __be16 df, flags; | |
db3c6139 | 541 | bool use_cache; |
2e15ea39 PS |
542 | int err; |
543 | ||
61adedf3 | 544 | tun_info = skb_tunnel_info(skb); |
7f9562a1 JB |
545 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
546 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
2e15ea39 PS |
547 | goto err_free_skb; |
548 | ||
549 | key = &tun_info->key; | |
db3c6139 DB |
550 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); |
551 | if (use_cache) | |
552 | rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl.saddr); | |
3c1cb4d2 PA |
553 | if (!rt) { |
554 | rt = gre_get_rt(skb, dev, &fl, key); | |
555 | if (IS_ERR(rt)) | |
556 | goto err_free_skb; | |
db3c6139 | 557 | if (use_cache) |
3c1cb4d2 PA |
558 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, |
559 | fl.saddr); | |
560 | } | |
2e15ea39 PS |
561 | |
562 | tunnel_hlen = ip_gre_calc_hlen(key->tun_flags); | |
563 | ||
564 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len | |
565 | + tunnel_hlen + sizeof(struct iphdr); | |
566 | if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { | |
567 | int head_delta = SKB_DATA_ALIGN(min_headroom - | |
568 | skb_headroom(skb) + | |
569 | 16); | |
570 | err = pskb_expand_head(skb, max_t(int, head_delta, 0), | |
571 | 0, GFP_ATOMIC); | |
572 | if (unlikely(err)) | |
573 | goto err_free_rt; | |
574 | } | |
575 | ||
576 | /* Push Tunnel header. */ | |
577 | skb = gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM)); | |
578 | if (IS_ERR(skb)) { | |
579 | skb = NULL; | |
580 | goto err_free_rt; | |
581 | } | |
582 | ||
583 | flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); | |
2090714e | 584 | build_header(skb, tunnel_hlen, flags, proto, |
2e15ea39 PS |
585 | tunnel_id_to_key(tun_info->key.tun_id), 0); |
586 | ||
587 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
039f5062 PS |
588 | |
589 | iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE, | |
590 | key->tos, key->ttl, df, false); | |
2e15ea39 PS |
591 | return; |
592 | ||
593 | err_free_rt: | |
594 | ip_rt_put(rt); | |
595 | err_free_skb: | |
596 | kfree_skb(skb); | |
597 | dev->stats.tx_dropped++; | |
598 | } | |
599 | ||
fc4099f1 PS |
600 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
601 | { | |
602 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
603 | struct rtable *rt; | |
604 | struct flowi4 fl4; | |
605 | ||
606 | if (ip_tunnel_info_af(info) != AF_INET) | |
607 | return -EINVAL; | |
608 | ||
609 | rt = gre_get_rt(skb, dev, &fl4, &info->key); | |
610 | if (IS_ERR(rt)) | |
611 | return PTR_ERR(rt); | |
612 | ||
613 | ip_rt_put(rt); | |
614 | info->key.u.ipv4.src = fl4.saddr; | |
615 | return 0; | |
616 | } | |
617 | ||
c5441932 PS |
618 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
619 | struct net_device *dev) | |
620 | { | |
621 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
622 | const struct iphdr *tnl_params; | |
1da177e4 | 623 | |
2e15ea39 | 624 | if (tunnel->collect_md) { |
2090714e | 625 | gre_fb_xmit(skb, dev, skb->protocol); |
2e15ea39 PS |
626 | return NETDEV_TX_OK; |
627 | } | |
628 | ||
c5441932 PS |
629 | if (dev->header_ops) { |
630 | /* Need space for new headers */ | |
631 | if (skb_cow_head(skb, dev->needed_headroom - | |
2bac7cb3 | 632 | (tunnel->hlen + sizeof(struct iphdr)))) |
c5441932 | 633 | goto free_skb; |
1da177e4 | 634 | |
c5441932 | 635 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 636 | |
c5441932 PS |
637 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
638 | * to gre header. | |
639 | */ | |
640 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); | |
8a0033a9 | 641 | skb_reset_mac_header(skb); |
c5441932 PS |
642 | } else { |
643 | if (skb_cow_head(skb, dev->needed_headroom)) | |
644 | goto free_skb; | |
1da177e4 | 645 | |
c5441932 | 646 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
647 | } |
648 | ||
8a0033a9 TT |
649 | skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); |
650 | if (IS_ERR(skb)) | |
651 | goto out; | |
652 | ||
c5441932 | 653 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
6ed10654 | 654 | return NETDEV_TX_OK; |
1da177e4 | 655 | |
c5441932 | 656 | free_skb: |
3acfa1e7 | 657 | kfree_skb(skb); |
c5441932 PS |
658 | out: |
659 | dev->stats.tx_dropped++; | |
6ed10654 | 660 | return NETDEV_TX_OK; |
1da177e4 LT |
661 | } |
662 | ||
c5441932 PS |
663 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
664 | struct net_device *dev) | |
ee34c1eb | 665 | { |
c5441932 | 666 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 667 | |
2e15ea39 | 668 | if (tunnel->collect_md) { |
2090714e | 669 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
2e15ea39 PS |
670 | return NETDEV_TX_OK; |
671 | } | |
672 | ||
45f2e997 | 673 | skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); |
c5441932 PS |
674 | if (IS_ERR(skb)) |
675 | goto out; | |
ee34c1eb | 676 | |
c5441932 PS |
677 | if (skb_cow_head(skb, dev->needed_headroom)) |
678 | goto free_skb; | |
42aa9162 | 679 | |
c5441932 | 680 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
c5441932 | 681 | return NETDEV_TX_OK; |
ee34c1eb | 682 | |
c5441932 | 683 | free_skb: |
3acfa1e7 | 684 | kfree_skb(skb); |
c5441932 PS |
685 | out: |
686 | dev->stats.tx_dropped++; | |
687 | return NETDEV_TX_OK; | |
ee34c1eb MS |
688 | } |
689 | ||
c5441932 PS |
690 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
691 | struct ifreq *ifr, int cmd) | |
1da177e4 | 692 | { |
4565e991 | 693 | int err; |
1da177e4 | 694 | struct ip_tunnel_parm p; |
1da177e4 | 695 | |
c5441932 PS |
696 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
697 | return -EFAULT; | |
6c734fb8 CW |
698 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
699 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
700 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
701 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
702 | return -EINVAL; | |
1da177e4 | 703 | } |
c5441932 PS |
704 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
705 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); | |
1da177e4 | 706 | |
c5441932 PS |
707 | err = ip_tunnel_ioctl(dev, &p, cmd); |
708 | if (err) | |
709 | return err; | |
1da177e4 | 710 | |
c5441932 PS |
711 | p.i_flags = tnl_flags_to_gre_flags(p.i_flags); |
712 | p.o_flags = tnl_flags_to_gre_flags(p.o_flags); | |
713 | ||
714 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
715 | return -EFAULT; | |
1da177e4 LT |
716 | return 0; |
717 | } | |
718 | ||
1da177e4 LT |
719 | /* Nice toy. Unfortunately, useless in real life :-) |
720 | It allows to construct virtual multiprotocol broadcast "LAN" | |
721 | over the Internet, provided multicast routing is tuned. | |
722 | ||
723 | ||
724 | I have no idea was this bicycle invented before me, | |
725 | so that I had to set ARPHRD_IPGRE to a random value. | |
726 | I have an impression, that Cisco could make something similar, | |
727 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 728 | |
1da177e4 LT |
729 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
730 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
731 | ||
732 | ping -t 255 224.66.66.66 | |
733 | ||
734 | If nobody answers, mbone does not work. | |
735 | ||
736 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
737 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
738 | ifconfig Universe up | |
739 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
740 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
741 | ftp 10.66.66.66 | |
742 | ... | |
743 | ftp fec0:6666:6666::193.233.7.65 | |
744 | ... | |
1da177e4 | 745 | */ |
3b04ddde SH |
746 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
747 | unsigned short type, | |
1507850b | 748 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 749 | { |
2941a486 | 750 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
751 | struct iphdr *iph; |
752 | struct gre_base_hdr *greh; | |
1da177e4 | 753 | |
c5441932 PS |
754 | iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph)); |
755 | greh = (struct gre_base_hdr *)(iph+1); | |
756 | greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags); | |
757 | greh->protocol = htons(type); | |
1da177e4 | 758 | |
c5441932 | 759 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 760 | |
c5441932 | 761 | /* Set the source hardware address. */ |
1da177e4 LT |
762 | if (saddr) |
763 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 764 | if (daddr) |
1da177e4 | 765 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 766 | if (iph->daddr) |
77a482bd | 767 | return t->hlen + sizeof(*iph); |
e905a9ed | 768 | |
c5441932 | 769 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
770 | } |
771 | ||
6a5f44d7 TT |
772 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
773 | { | |
b71d1d42 | 774 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
775 | memcpy(haddr, &iph->saddr, 4); |
776 | return 4; | |
777 | } | |
778 | ||
3b04ddde SH |
779 | static const struct header_ops ipgre_header_ops = { |
780 | .create = ipgre_header, | |
6a5f44d7 | 781 | .parse = ipgre_header_parse, |
3b04ddde SH |
782 | }; |
783 | ||
6a5f44d7 | 784 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
785 | static int ipgre_open(struct net_device *dev) |
786 | { | |
2941a486 | 787 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 788 | |
f97c1e0c | 789 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
790 | struct flowi4 fl4; |
791 | struct rtable *rt; | |
792 | ||
b57708ad | 793 | rt = ip_route_output_gre(t->net, &fl4, |
cbb1e85f DM |
794 | t->parms.iph.daddr, |
795 | t->parms.iph.saddr, | |
796 | t->parms.o_key, | |
797 | RT_TOS(t->parms.iph.tos), | |
798 | t->parms.link); | |
b23dd4fe | 799 | if (IS_ERR(rt)) |
1da177e4 | 800 | return -EADDRNOTAVAIL; |
d8d1f30b | 801 | dev = rt->dst.dev; |
1da177e4 | 802 | ip_rt_put(rt); |
51456b29 | 803 | if (!__in_dev_get_rtnl(dev)) |
1da177e4 LT |
804 | return -EADDRNOTAVAIL; |
805 | t->mlink = dev->ifindex; | |
e5ed6399 | 806 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
807 | } |
808 | return 0; | |
809 | } | |
810 | ||
811 | static int ipgre_close(struct net_device *dev) | |
812 | { | |
2941a486 | 813 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 814 | |
f97c1e0c | 815 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 816 | struct in_device *in_dev; |
b57708ad | 817 | in_dev = inetdev_by_index(t->net, t->mlink); |
8723e1b4 | 818 | if (in_dev) |
1da177e4 | 819 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
820 | } |
821 | return 0; | |
822 | } | |
1da177e4 LT |
823 | #endif |
824 | ||
b8c26a33 SH |
825 | static const struct net_device_ops ipgre_netdev_ops = { |
826 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 827 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
828 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
829 | .ndo_open = ipgre_open, | |
830 | .ndo_stop = ipgre_close, | |
831 | #endif | |
c5441932 | 832 | .ndo_start_xmit = ipgre_xmit, |
b8c26a33 | 833 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
c5441932 PS |
834 | .ndo_change_mtu = ip_tunnel_change_mtu, |
835 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 836 | .ndo_get_iflink = ip_tunnel_get_iflink, |
b8c26a33 SH |
837 | }; |
838 | ||
6b78f16e ED |
839 | #define GRE_FEATURES (NETIF_F_SG | \ |
840 | NETIF_F_FRAGLIST | \ | |
841 | NETIF_F_HIGHDMA | \ | |
842 | NETIF_F_HW_CSUM) | |
843 | ||
1da177e4 LT |
844 | static void ipgre_tunnel_setup(struct net_device *dev) |
845 | { | |
b8c26a33 | 846 | dev->netdev_ops = &ipgre_netdev_ops; |
5a455275 | 847 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
848 | ip_tunnel_setup(dev, ipgre_net_id); |
849 | } | |
1da177e4 | 850 | |
c5441932 PS |
851 | static void __gre_tunnel_init(struct net_device *dev) |
852 | { | |
853 | struct ip_tunnel *tunnel; | |
4565e991 | 854 | int t_hlen; |
c5441932 PS |
855 | |
856 | tunnel = netdev_priv(dev); | |
4565e991 | 857 | tunnel->tun_hlen = ip_gre_calc_hlen(tunnel->parms.o_flags); |
c5441932 PS |
858 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
859 | ||
4565e991 TH |
860 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
861 | ||
862 | t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
863 | ||
864 | dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; | |
865 | dev->mtu = ETH_DATA_LEN - t_hlen - 4; | |
6b78f16e | 866 | |
b57708ad | 867 | dev->features |= GRE_FEATURES; |
6b78f16e | 868 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
869 | |
870 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
a0ca153f AD |
871 | /* TCP offload with GRE SEQ is not supported, nor |
872 | * can we support 2 levels of outer headers requiring | |
873 | * an update. | |
874 | */ | |
875 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
876 | (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { | |
877 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
878 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
879 | } | |
880 | ||
c5441932 PS |
881 | /* Can use a lockless transmit, unless we generate |
882 | * output sequences | |
883 | */ | |
884 | dev->features |= NETIF_F_LLTX; | |
885 | } | |
1da177e4 LT |
886 | } |
887 | ||
888 | static int ipgre_tunnel_init(struct net_device *dev) | |
889 | { | |
c5441932 PS |
890 | struct ip_tunnel *tunnel = netdev_priv(dev); |
891 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 892 | |
c5441932 | 893 | __gre_tunnel_init(dev); |
1da177e4 | 894 | |
c5441932 PS |
895 | memcpy(dev->dev_addr, &iph->saddr, 4); |
896 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 897 | |
c5441932 | 898 | dev->flags = IFF_NOARP; |
02875878 | 899 | netif_keep_dst(dev); |
c5441932 | 900 | dev->addr_len = 4; |
1da177e4 | 901 | |
a64b04d8 | 902 | if (iph->daddr && !tunnel->collect_md) { |
1da177e4 | 903 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 904 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
905 | if (!iph->saddr) |
906 | return -EINVAL; | |
907 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 908 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
909 | } |
910 | #endif | |
a64b04d8 | 911 | } else if (!tunnel->collect_md) { |
6a5f44d7 | 912 | dev->header_ops = &ipgre_header_ops; |
a64b04d8 | 913 | } |
1da177e4 | 914 | |
c5441932 | 915 | return ip_tunnel_init(dev); |
1da177e4 LT |
916 | } |
917 | ||
9f57c67c PS |
918 | static const struct gre_protocol ipgre_protocol = { |
919 | .handler = gre_rcv, | |
920 | .err_handler = gre_err, | |
1da177e4 LT |
921 | }; |
922 | ||
2c8c1e72 | 923 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 924 | { |
c5441932 | 925 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
926 | } |
927 | ||
2c8c1e72 | 928 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 | 929 | { |
c5441932 | 930 | struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id); |
6c742e71 | 931 | ip_tunnel_delete_net(itn, &ipgre_link_ops); |
59a4c759 PE |
932 | } |
933 | ||
934 | static struct pernet_operations ipgre_net_ops = { | |
935 | .init = ipgre_init_net, | |
936 | .exit = ipgre_exit_net, | |
cfb8fbf2 | 937 | .id = &ipgre_net_id, |
c5441932 | 938 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 939 | }; |
1da177e4 | 940 | |
c19e654d HX |
941 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
942 | { | |
943 | __be16 flags; | |
944 | ||
945 | if (!data) | |
946 | return 0; | |
947 | ||
948 | flags = 0; | |
949 | if (data[IFLA_GRE_IFLAGS]) | |
950 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
951 | if (data[IFLA_GRE_OFLAGS]) | |
952 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
953 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
954 | return -EINVAL; | |
955 | ||
946b636f JB |
956 | if (data[IFLA_GRE_COLLECT_METADATA] && |
957 | data[IFLA_GRE_ENCAP_TYPE] && | |
958 | nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) | |
959 | return -EINVAL; | |
960 | ||
c19e654d HX |
961 | return 0; |
962 | } | |
963 | ||
e1a80002 HX |
964 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
965 | { | |
966 | __be32 daddr; | |
967 | ||
968 | if (tb[IFLA_ADDRESS]) { | |
969 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
970 | return -EINVAL; | |
971 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
972 | return -EADDRNOTAVAIL; | |
973 | } | |
974 | ||
975 | if (!data) | |
976 | goto out; | |
977 | ||
978 | if (data[IFLA_GRE_REMOTE]) { | |
979 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
980 | if (!daddr) | |
981 | return -EINVAL; | |
982 | } | |
983 | ||
984 | out: | |
985 | return ipgre_tunnel_validate(tb, data); | |
986 | } | |
987 | ||
2e15ea39 PS |
988 | static void ipgre_netlink_parms(struct net_device *dev, |
989 | struct nlattr *data[], | |
990 | struct nlattr *tb[], | |
991 | struct ip_tunnel_parm *parms) | |
c19e654d | 992 | { |
7bb82d92 | 993 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
994 | |
995 | parms->iph.protocol = IPPROTO_GRE; | |
996 | ||
997 | if (!data) | |
998 | return; | |
999 | ||
1000 | if (data[IFLA_GRE_LINK]) | |
1001 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1002 | ||
1003 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 1004 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
1005 | |
1006 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 1007 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
1008 | |
1009 | if (data[IFLA_GRE_IKEY]) | |
1010 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1011 | ||
1012 | if (data[IFLA_GRE_OKEY]) | |
1013 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1014 | ||
1015 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 1016 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1017 | |
1018 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 1019 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1020 | |
1021 | if (data[IFLA_GRE_TTL]) | |
1022 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1023 | ||
1024 | if (data[IFLA_GRE_TOS]) | |
1025 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1026 | ||
1027 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1028 | parms->iph.frag_off = htons(IP_DF); | |
2e15ea39 PS |
1029 | |
1030 | if (data[IFLA_GRE_COLLECT_METADATA]) { | |
1031 | struct ip_tunnel *t = netdev_priv(dev); | |
1032 | ||
1033 | t->collect_md = true; | |
1034 | } | |
c19e654d HX |
1035 | } |
1036 | ||
4565e991 TH |
1037 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1038 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], | |
1039 | struct ip_tunnel_encap *ipencap) | |
1040 | { | |
1041 | bool ret = false; | |
1042 | ||
1043 | memset(ipencap, 0, sizeof(*ipencap)); | |
1044 | ||
1045 | if (!data) | |
1046 | return ret; | |
1047 | ||
1048 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
1049 | ret = true; | |
1050 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
1051 | } | |
1052 | ||
1053 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
1054 | ret = true; | |
1055 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
1056 | } | |
1057 | ||
1058 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
1059 | ret = true; | |
3e97fa70 | 1060 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
4565e991 TH |
1061 | } |
1062 | ||
1063 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
1064 | ret = true; | |
3e97fa70 | 1065 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
4565e991 TH |
1066 | } |
1067 | ||
1068 | return ret; | |
1069 | } | |
1070 | ||
c5441932 | 1071 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 1072 | { |
c5441932 | 1073 | __gre_tunnel_init(dev); |
bec94d43 | 1074 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
e1a80002 | 1075 | |
c5441932 | 1076 | return ip_tunnel_init(dev); |
e1a80002 HX |
1077 | } |
1078 | ||
c5441932 PS |
1079 | static const struct net_device_ops gre_tap_netdev_ops = { |
1080 | .ndo_init = gre_tap_init, | |
1081 | .ndo_uninit = ip_tunnel_uninit, | |
1082 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
1083 | .ndo_set_mac_address = eth_mac_addr, |
1084 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 PS |
1085 | .ndo_change_mtu = ip_tunnel_change_mtu, |
1086 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 1087 | .ndo_get_iflink = ip_tunnel_get_iflink, |
fc4099f1 | 1088 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
b8c26a33 SH |
1089 | }; |
1090 | ||
e1a80002 HX |
1091 | static void ipgre_tap_setup(struct net_device *dev) |
1092 | { | |
e1a80002 | 1093 | ether_setup(dev); |
d13b161c JB |
1094 | dev->netdev_ops = &gre_tap_netdev_ops; |
1095 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1096 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c5441932 | 1097 | ip_tunnel_setup(dev, gre_tap_net_id); |
e1a80002 HX |
1098 | } |
1099 | ||
c5441932 PS |
1100 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
1101 | struct nlattr *tb[], struct nlattr *data[]) | |
c19e654d | 1102 | { |
c5441932 | 1103 | struct ip_tunnel_parm p; |
4565e991 TH |
1104 | struct ip_tunnel_encap ipencap; |
1105 | ||
1106 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1107 | struct ip_tunnel *t = netdev_priv(dev); | |
1108 | int err = ip_tunnel_encap_setup(t, &ipencap); | |
1109 | ||
1110 | if (err < 0) | |
1111 | return err; | |
1112 | } | |
c19e654d | 1113 | |
2e15ea39 | 1114 | ipgre_netlink_parms(dev, data, tb, &p); |
c5441932 | 1115 | return ip_tunnel_newlink(dev, tb, &p); |
c19e654d HX |
1116 | } |
1117 | ||
1118 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1119 | struct nlattr *data[]) | |
1120 | { | |
c19e654d | 1121 | struct ip_tunnel_parm p; |
4565e991 TH |
1122 | struct ip_tunnel_encap ipencap; |
1123 | ||
1124 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1125 | struct ip_tunnel *t = netdev_priv(dev); | |
1126 | int err = ip_tunnel_encap_setup(t, &ipencap); | |
1127 | ||
1128 | if (err < 0) | |
1129 | return err; | |
1130 | } | |
c19e654d | 1131 | |
2e15ea39 | 1132 | ipgre_netlink_parms(dev, data, tb, &p); |
c5441932 | 1133 | return ip_tunnel_changelink(dev, tb, &p); |
c19e654d HX |
1134 | } |
1135 | ||
1136 | static size_t ipgre_get_size(const struct net_device *dev) | |
1137 | { | |
1138 | return | |
1139 | /* IFLA_GRE_LINK */ | |
1140 | nla_total_size(4) + | |
1141 | /* IFLA_GRE_IFLAGS */ | |
1142 | nla_total_size(2) + | |
1143 | /* IFLA_GRE_OFLAGS */ | |
1144 | nla_total_size(2) + | |
1145 | /* IFLA_GRE_IKEY */ | |
1146 | nla_total_size(4) + | |
1147 | /* IFLA_GRE_OKEY */ | |
1148 | nla_total_size(4) + | |
1149 | /* IFLA_GRE_LOCAL */ | |
1150 | nla_total_size(4) + | |
1151 | /* IFLA_GRE_REMOTE */ | |
1152 | nla_total_size(4) + | |
1153 | /* IFLA_GRE_TTL */ | |
1154 | nla_total_size(1) + | |
1155 | /* IFLA_GRE_TOS */ | |
1156 | nla_total_size(1) + | |
1157 | /* IFLA_GRE_PMTUDISC */ | |
1158 | nla_total_size(1) + | |
4565e991 TH |
1159 | /* IFLA_GRE_ENCAP_TYPE */ |
1160 | nla_total_size(2) + | |
1161 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1162 | nla_total_size(2) + | |
1163 | /* IFLA_GRE_ENCAP_SPORT */ | |
1164 | nla_total_size(2) + | |
1165 | /* IFLA_GRE_ENCAP_DPORT */ | |
1166 | nla_total_size(2) + | |
2e15ea39 PS |
1167 | /* IFLA_GRE_COLLECT_METADATA */ |
1168 | nla_total_size(0) + | |
c19e654d HX |
1169 | 0; |
1170 | } | |
1171 | ||
1172 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1173 | { | |
1174 | struct ip_tunnel *t = netdev_priv(dev); | |
1175 | struct ip_tunnel_parm *p = &t->parms; | |
1176 | ||
f3756b79 | 1177 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
c5441932 PS |
1178 | nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) || |
1179 | nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) || | |
f3756b79 DM |
1180 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1181 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1182 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
1183 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
f3756b79 DM |
1184 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
1185 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1186 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
1187 | !!(p->iph.frag_off & htons(IP_DF)))) | |
1188 | goto nla_put_failure; | |
4565e991 TH |
1189 | |
1190 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1191 | t->encap.type) || | |
3e97fa70 SD |
1192 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
1193 | t->encap.sport) || | |
1194 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1195 | t->encap.dport) || | |
4565e991 | 1196 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
e1b2cb65 | 1197 | t->encap.flags)) |
4565e991 TH |
1198 | goto nla_put_failure; |
1199 | ||
2e15ea39 PS |
1200 | if (t->collect_md) { |
1201 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) | |
1202 | goto nla_put_failure; | |
1203 | } | |
1204 | ||
c19e654d HX |
1205 | return 0; |
1206 | ||
1207 | nla_put_failure: | |
1208 | return -EMSGSIZE; | |
1209 | } | |
1210 | ||
1211 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1212 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1213 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1214 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1215 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1216 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1217 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1218 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1219 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1220 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1221 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
4565e991 TH |
1222 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1223 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1224 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1225 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2e15ea39 | 1226 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
c19e654d HX |
1227 | }; |
1228 | ||
1229 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1230 | .kind = "gre", | |
1231 | .maxtype = IFLA_GRE_MAX, | |
1232 | .policy = ipgre_policy, | |
1233 | .priv_size = sizeof(struct ip_tunnel), | |
1234 | .setup = ipgre_tunnel_setup, | |
1235 | .validate = ipgre_tunnel_validate, | |
1236 | .newlink = ipgre_newlink, | |
1237 | .changelink = ipgre_changelink, | |
c5441932 | 1238 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
1239 | .get_size = ipgre_get_size, |
1240 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1241 | .get_link_net = ip_tunnel_get_link_net, |
c19e654d HX |
1242 | }; |
1243 | ||
e1a80002 HX |
1244 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1245 | .kind = "gretap", | |
1246 | .maxtype = IFLA_GRE_MAX, | |
1247 | .policy = ipgre_policy, | |
1248 | .priv_size = sizeof(struct ip_tunnel), | |
1249 | .setup = ipgre_tap_setup, | |
1250 | .validate = ipgre_tap_validate, | |
1251 | .newlink = ipgre_newlink, | |
1252 | .changelink = ipgre_changelink, | |
c5441932 | 1253 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
1254 | .get_size = ipgre_get_size, |
1255 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1256 | .get_link_net = ip_tunnel_get_link_net, |
e1a80002 HX |
1257 | }; |
1258 | ||
b2acd1dc PS |
1259 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1260 | u8 name_assign_type) | |
1261 | { | |
1262 | struct nlattr *tb[IFLA_MAX + 1]; | |
1263 | struct net_device *dev; | |
1264 | struct ip_tunnel *t; | |
1265 | int err; | |
1266 | ||
1267 | memset(&tb, 0, sizeof(tb)); | |
1268 | ||
1269 | dev = rtnl_create_link(net, name, name_assign_type, | |
1270 | &ipgre_tap_ops, tb); | |
1271 | if (IS_ERR(dev)) | |
1272 | return dev; | |
1273 | ||
1274 | /* Configure flow based GRE device. */ | |
1275 | t = netdev_priv(dev); | |
1276 | t->collect_md = true; | |
1277 | ||
1278 | err = ipgre_newlink(net, dev, tb, NULL); | |
1279 | if (err < 0) | |
1280 | goto out; | |
7e059158 DW |
1281 | |
1282 | /* openvswitch users expect packet sizes to be unrestricted, | |
1283 | * so set the largest MTU we can. | |
1284 | */ | |
1285 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); | |
1286 | if (err) | |
1287 | goto out; | |
1288 | ||
b2acd1dc PS |
1289 | return dev; |
1290 | out: | |
1291 | free_netdev(dev); | |
1292 | return ERR_PTR(err); | |
1293 | } | |
1294 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); | |
1295 | ||
c5441932 PS |
1296 | static int __net_init ipgre_tap_init_net(struct net *net) |
1297 | { | |
2e15ea39 | 1298 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
c5441932 PS |
1299 | } |
1300 | ||
1301 | static void __net_exit ipgre_tap_exit_net(struct net *net) | |
1302 | { | |
1303 | struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id); | |
6c742e71 | 1304 | ip_tunnel_delete_net(itn, &ipgre_tap_ops); |
c5441932 PS |
1305 | } |
1306 | ||
1307 | static struct pernet_operations ipgre_tap_net_ops = { | |
1308 | .init = ipgre_tap_init_net, | |
1309 | .exit = ipgre_tap_exit_net, | |
1310 | .id = &gre_tap_net_id, | |
1311 | .size = sizeof(struct ip_tunnel_net), | |
1312 | }; | |
1da177e4 LT |
1313 | |
1314 | static int __init ipgre_init(void) | |
1315 | { | |
1316 | int err; | |
1317 | ||
058bd4d2 | 1318 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1319 | |
cfb8fbf2 | 1320 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1321 | if (err < 0) |
c2892f02 AD |
1322 | return err; |
1323 | ||
c5441932 PS |
1324 | err = register_pernet_device(&ipgre_tap_net_ops); |
1325 | if (err < 0) | |
1326 | goto pnet_tap_faied; | |
1327 | ||
9f57c67c | 1328 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1329 | if (err < 0) { |
058bd4d2 | 1330 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1331 | goto add_proto_failed; |
1332 | } | |
7daa0004 | 1333 | |
c19e654d HX |
1334 | err = rtnl_link_register(&ipgre_link_ops); |
1335 | if (err < 0) | |
1336 | goto rtnl_link_failed; | |
1337 | ||
e1a80002 HX |
1338 | err = rtnl_link_register(&ipgre_tap_ops); |
1339 | if (err < 0) | |
1340 | goto tap_ops_failed; | |
1341 | ||
c5441932 | 1342 | return 0; |
c19e654d | 1343 | |
e1a80002 HX |
1344 | tap_ops_failed: |
1345 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1346 | rtnl_link_failed: |
9f57c67c | 1347 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1348 | add_proto_failed: |
c5441932 PS |
1349 | unregister_pernet_device(&ipgre_tap_net_ops); |
1350 | pnet_tap_faied: | |
c2892f02 | 1351 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1352 | return err; |
1da177e4 LT |
1353 | } |
1354 | ||
db44575f | 1355 | static void __exit ipgre_fini(void) |
1da177e4 | 1356 | { |
e1a80002 | 1357 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1358 | rtnl_link_unregister(&ipgre_link_ops); |
9f57c67c | 1359 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c5441932 | 1360 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1361 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | module_init(ipgre_init); | |
1365 | module_exit(ipgre_fini); | |
1366 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1367 | MODULE_ALIAS_RTNL_LINK("gre"); |
1368 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1369 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1370 | MODULE_ALIAS_NETDEV("gretap0"); |