]>
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> | |
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 | |
1da177e4 LT |
52 | /* |
53 | Problems & solutions | |
54 | -------------------- | |
55 | ||
56 | 1. The most important issue is detecting local dead loops. | |
57 | They would cause complete host lockup in transmit, which | |
58 | would be "resolved" by stack overflow or, if queueing is enabled, | |
59 | with infinite looping in net_bh. | |
60 | ||
61 | We cannot track such dead loops during route installation, | |
62 | it is infeasible task. The most general solutions would be | |
63 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 64 | and silently drop packet when it expires. It is a good |
bff52857 | 65 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
66 | skb, even if no tunneling is used. |
67 | ||
6d0722a2 ED |
68 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
69 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
70 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
71 | |
72 | 2. Networking dead loops would not kill routers, but would really | |
73 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
74 | if we copy it from packet being encapsulated to upper header. | |
75 | It is very good solution, but it introduces two problems: | |
76 | ||
77 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
78 | do not work over tunnels. | |
79 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
80 | so that this problem would be solved and traceroute output | |
81 | would even more informative. This idea appeared to be wrong: | |
82 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
83 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
84 | return only 8 bytes of payload. It is the end. | |
85 | ||
86 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
87 | we should search for another solution. | |
88 | ||
89 | One of them is to parse packet trying to detect inner encapsulation | |
90 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 91 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
92 | |
93 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
94 | We force DF flag on tunnels with preconfigured hop limit, | |
95 | that is ALL. :-) Well, it does not remove the problem completely, | |
96 | but exponential growth of network traffic is changed to linear | |
97 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 98 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
99 | Yes, it is not good if there exists a router in the loop, |
100 | which does not force DF, even when encapsulating packets have DF set. | |
101 | But it is not our problem! Nobody could accuse us, we made | |
102 | all that we could make. Even if it is your gated who injected | |
103 | fatal route to network, even if it were you who configured | |
104 | fatal static route: you are innocent. :-) | |
105 | ||
1da177e4 LT |
106 | Alexey Kuznetsov. |
107 | */ | |
108 | ||
eccc1bb8 | 109 | static bool log_ecn_error = true; |
110 | module_param(log_ecn_error, bool, 0644); | |
111 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
112 | ||
c19e654d | 113 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 | 114 | static int ipgre_tunnel_init(struct net_device *dev); |
eb8ce741 | 115 | |
f99189b1 | 116 | static int ipgre_net_id __read_mostly; |
c5441932 | 117 | static int gre_tap_net_id __read_mostly; |
1da177e4 | 118 | |
9f57c67c PS |
119 | static void ipgre_err(struct sk_buff *skb, u32 info, |
120 | const struct tnl_ptk_info *tpi) | |
1da177e4 | 121 | { |
1da177e4 | 122 | |
c5441932 PS |
123 | /* All the routers (except for Linux) return only |
124 | 8 bytes of packet payload. It means, that precise relaying of | |
125 | ICMP in the real Internet is absolutely infeasible. | |
1da177e4 | 126 | |
c5441932 PS |
127 | Moreover, Cisco "wise men" put GRE key to the third word |
128 | in GRE header. It makes impossible maintaining even soft | |
129 | state for keyed GRE tunnels with enabled checksum. Tell | |
130 | them "thank you". | |
1da177e4 | 131 | |
c5441932 PS |
132 | Well, I wonder, rfc1812 was written by Cisco employee, |
133 | what the hell these idiots break standards established | |
134 | by themselves??? | |
135 | */ | |
136 | struct net *net = dev_net(skb->dev); | |
137 | struct ip_tunnel_net *itn; | |
96f5a846 | 138 | const struct iphdr *iph; |
88c7664f ACM |
139 | const int type = icmp_hdr(skb)->type; |
140 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 141 | struct ip_tunnel *t; |
1da177e4 | 142 | |
1da177e4 LT |
143 | switch (type) { |
144 | default: | |
145 | case ICMP_PARAMETERPROB: | |
9f57c67c | 146 | return; |
1da177e4 LT |
147 | |
148 | case ICMP_DEST_UNREACH: | |
149 | switch (code) { | |
150 | case ICMP_SR_FAILED: | |
151 | case ICMP_PORT_UNREACH: | |
152 | /* Impossible event. */ | |
9f57c67c | 153 | return; |
1da177e4 LT |
154 | default: |
155 | /* All others are translated to HOST_UNREACH. | |
156 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
157 | I believe they are just ether pollution. --ANK | |
158 | */ | |
159 | break; | |
160 | } | |
161 | break; | |
9f57c67c | 162 | |
1da177e4 LT |
163 | case ICMP_TIME_EXCEEDED: |
164 | if (code != ICMP_EXC_TTL) | |
9f57c67c | 165 | return; |
1da177e4 | 166 | break; |
55be7a9c DM |
167 | |
168 | case ICMP_REDIRECT: | |
169 | break; | |
1da177e4 LT |
170 | } |
171 | ||
bda7bb46 | 172 | if (tpi->proto == htons(ETH_P_TEB)) |
c5441932 PS |
173 | itn = net_generic(net, gre_tap_net_id); |
174 | else | |
175 | itn = net_generic(net, ipgre_net_id); | |
176 | ||
c0c0c50f | 177 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
bda7bb46 PS |
178 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
179 | iph->daddr, iph->saddr, tpi->key); | |
d2083287 | 180 | |
51456b29 | 181 | if (!t) |
9f57c67c | 182 | return; |
36393395 | 183 | |
36393395 | 184 | if (t->parms.iph.daddr == 0 || |
f97c1e0c | 185 | ipv4_is_multicast(t->parms.iph.daddr)) |
9f57c67c | 186 | return; |
1da177e4 LT |
187 | |
188 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
9f57c67c | 189 | return; |
1da177e4 | 190 | |
da6185d8 | 191 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
192 | t->err_count++; |
193 | else | |
194 | t->err_count = 1; | |
195 | t->err_time = jiffies; | |
9f57c67c PS |
196 | } |
197 | ||
198 | static void gre_err(struct sk_buff *skb, u32 info) | |
199 | { | |
200 | /* All the routers (except for Linux) return only | |
201 | * 8 bytes of packet payload. It means, that precise relaying of | |
202 | * ICMP in the real Internet is absolutely infeasible. | |
203 | * | |
204 | * Moreover, Cisco "wise men" put GRE key to the third word | |
205 | * in GRE header. It makes impossible maintaining even soft | |
206 | * state for keyed | |
207 | * GRE tunnels with enabled checksum. Tell them "thank you". | |
208 | * | |
209 | * Well, I wonder, rfc1812 was written by Cisco employee, | |
210 | * what the hell these idiots break standards established | |
211 | * by themselves??? | |
212 | */ | |
213 | ||
e582615a | 214 | const struct iphdr *iph = (struct iphdr *)skb->data; |
9f57c67c PS |
215 | const int type = icmp_hdr(skb)->type; |
216 | const int code = icmp_hdr(skb)->code; | |
217 | struct tnl_ptk_info tpi; | |
218 | bool csum_err = false; | |
219 | ||
e582615a ED |
220 | if (gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), |
221 | iph->ihl * 4) < 0) { | |
9f57c67c PS |
222 | if (!csum_err) /* ignore csum errors. */ |
223 | return; | |
224 | } | |
225 | ||
226 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
227 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
228 | skb->dev->ifindex, 0, IPPROTO_GRE, 0); | |
229 | return; | |
230 | } | |
231 | if (type == ICMP_REDIRECT) { | |
232 | ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0, | |
233 | IPPROTO_GRE, 0); | |
234 | return; | |
235 | } | |
236 | ||
237 | ipgre_err(skb, info, &tpi); | |
1da177e4 LT |
238 | } |
239 | ||
2e15ea39 PS |
240 | static __be64 key_to_tunnel_id(__be32 key) |
241 | { | |
242 | #ifdef __BIG_ENDIAN | |
243 | return (__force __be64)((__force u32)key); | |
244 | #else | |
245 | return (__force __be64)((__force u64)key << 32); | |
246 | #endif | |
247 | } | |
248 | ||
249 | /* Returns the least-significant 32 bits of a __be64. */ | |
250 | static __be32 tunnel_id_to_key(__be64 x) | |
251 | { | |
252 | #ifdef __BIG_ENDIAN | |
253 | return (__force __be32)x; | |
254 | #else | |
255 | return (__force __be32)((__force u64)x >> 32); | |
256 | #endif | |
257 | } | |
258 | ||
125372fa JB |
259 | static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
260 | struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) | |
1da177e4 | 261 | { |
2e15ea39 | 262 | struct metadata_dst *tun_dst = NULL; |
b71d1d42 | 263 | const struct iphdr *iph; |
1da177e4 | 264 | struct ip_tunnel *tunnel; |
1da177e4 | 265 | |
c5441932 | 266 | iph = ip_hdr(skb); |
bda7bb46 PS |
267 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
268 | iph->saddr, iph->daddr, tpi->key); | |
e1a80002 | 269 | |
d2083287 | 270 | if (tunnel) { |
125372fa JB |
271 | if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, |
272 | raw_proto, false) < 0) | |
244a797b JB |
273 | goto drop; |
274 | ||
e271c7b4 JB |
275 | if (tunnel->dev->type != ARPHRD_NONE) |
276 | skb_pop_mac_header(skb); | |
277 | else | |
278 | skb_reset_mac_header(skb); | |
2e15ea39 | 279 | if (tunnel->collect_md) { |
c29a70d2 PS |
280 | __be16 flags; |
281 | __be64 tun_id; | |
2e15ea39 | 282 | |
c29a70d2 PS |
283 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
284 | tun_id = key_to_tunnel_id(tpi->key); | |
285 | tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); | |
2e15ea39 PS |
286 | if (!tun_dst) |
287 | return PACKET_REJECT; | |
2e15ea39 PS |
288 | } |
289 | ||
290 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
bda7bb46 | 291 | return PACKET_RCVD; |
1da177e4 | 292 | } |
125372fa | 293 | return PACKET_NEXT; |
244a797b JB |
294 | |
295 | drop: | |
296 | kfree_skb(skb); | |
297 | return PACKET_RCVD; | |
1da177e4 LT |
298 | } |
299 | ||
125372fa JB |
300 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
301 | int hdr_len) | |
302 | { | |
303 | struct net *net = dev_net(skb->dev); | |
304 | struct ip_tunnel_net *itn; | |
305 | int res; | |
306 | ||
307 | if (tpi->proto == htons(ETH_P_TEB)) | |
308 | itn = net_generic(net, gre_tap_net_id); | |
309 | else | |
310 | itn = net_generic(net, ipgre_net_id); | |
311 | ||
312 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); | |
313 | if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { | |
314 | /* ipgre tunnels in collect metadata mode should receive | |
315 | * also ETH_P_TEB traffic. | |
316 | */ | |
317 | itn = net_generic(net, ipgre_net_id); | |
318 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); | |
319 | } | |
320 | return res; | |
321 | } | |
322 | ||
9f57c67c PS |
323 | static int gre_rcv(struct sk_buff *skb) |
324 | { | |
325 | struct tnl_ptk_info tpi; | |
326 | bool csum_err = false; | |
95f5c64c | 327 | int hdr_len; |
9f57c67c PS |
328 | |
329 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
330 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { | |
331 | /* Looped back packet, drop it! */ | |
332 | if (rt_is_output_route(skb_rtable(skb))) | |
333 | goto drop; | |
334 | } | |
335 | #endif | |
336 | ||
e582615a | 337 | hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); |
f132ae7c | 338 | if (hdr_len < 0) |
95f5c64c TH |
339 | goto drop; |
340 | ||
244a797b | 341 | if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
9f57c67c PS |
342 | return 0; |
343 | ||
344 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
345 | drop: | |
346 | kfree_skb(skb); | |
347 | return 0; | |
348 | } | |
349 | ||
c5441932 PS |
350 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
351 | const struct iphdr *tnl_params, | |
352 | __be16 proto) | |
353 | { | |
354 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1da177e4 | 355 | |
c5441932 PS |
356 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
357 | tunnel->o_seqno++; | |
1da177e4 | 358 | |
c5441932 | 359 | /* Push GRE header. */ |
182a352d TH |
360 | gre_build_header(skb, tunnel->tun_hlen, |
361 | tunnel->parms.o_flags, proto, tunnel->parms.o_key, | |
362 | htonl(tunnel->o_seqno)); | |
54bc9bac | 363 | |
2e15ea39 | 364 | skb_set_inner_protocol(skb, proto); |
bf3d6a8f | 365 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
c5441932 | 366 | } |
1da177e4 | 367 | |
aed069df | 368 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
b2acd1dc | 369 | { |
6fa79666 | 370 | return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
b2acd1dc PS |
371 | } |
372 | ||
fc4099f1 PS |
373 | static struct rtable *gre_get_rt(struct sk_buff *skb, |
374 | struct net_device *dev, | |
375 | struct flowi4 *fl, | |
376 | const struct ip_tunnel_key *key) | |
377 | { | |
378 | struct net *net = dev_net(dev); | |
379 | ||
380 | memset(fl, 0, sizeof(*fl)); | |
381 | fl->daddr = key->u.ipv4.dst; | |
382 | fl->saddr = key->u.ipv4.src; | |
383 | fl->flowi4_tos = RT_TOS(key->tos); | |
384 | fl->flowi4_mark = skb->mark; | |
385 | fl->flowi4_proto = IPPROTO_GRE; | |
386 | ||
387 | return ip_route_output_key(net, fl); | |
388 | } | |
389 | ||
2090714e JB |
390 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
391 | __be16 proto) | |
2e15ea39 PS |
392 | { |
393 | struct ip_tunnel_info *tun_info; | |
2e15ea39 | 394 | const struct ip_tunnel_key *key; |
db3c6139 | 395 | struct rtable *rt = NULL; |
2e15ea39 | 396 | struct flowi4 fl; |
2e15ea39 PS |
397 | int min_headroom; |
398 | int tunnel_hlen; | |
399 | __be16 df, flags; | |
db3c6139 | 400 | bool use_cache; |
2e15ea39 PS |
401 | int err; |
402 | ||
61adedf3 | 403 | tun_info = skb_tunnel_info(skb); |
7f9562a1 JB |
404 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
405 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
2e15ea39 PS |
406 | goto err_free_skb; |
407 | ||
408 | key = &tun_info->key; | |
db3c6139 DB |
409 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); |
410 | if (use_cache) | |
411 | rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl.saddr); | |
3c1cb4d2 PA |
412 | if (!rt) { |
413 | rt = gre_get_rt(skb, dev, &fl, key); | |
414 | if (IS_ERR(rt)) | |
415 | goto err_free_skb; | |
db3c6139 | 416 | if (use_cache) |
3c1cb4d2 PA |
417 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, |
418 | fl.saddr); | |
419 | } | |
2e15ea39 | 420 | |
95f5c64c | 421 | tunnel_hlen = gre_calc_hlen(key->tun_flags); |
2e15ea39 PS |
422 | |
423 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len | |
424 | + tunnel_hlen + sizeof(struct iphdr); | |
425 | if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { | |
426 | int head_delta = SKB_DATA_ALIGN(min_headroom - | |
427 | skb_headroom(skb) + | |
428 | 16); | |
429 | err = pskb_expand_head(skb, max_t(int, head_delta, 0), | |
430 | 0, GFP_ATOMIC); | |
431 | if (unlikely(err)) | |
432 | goto err_free_rt; | |
433 | } | |
434 | ||
435 | /* Push Tunnel header. */ | |
aed069df | 436 | if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
2e15ea39 | 437 | goto err_free_rt; |
2e15ea39 PS |
438 | |
439 | flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); | |
cba65321 | 440 | gre_build_header(skb, tunnel_hlen, flags, proto, |
182a352d | 441 | tunnel_id_to_key(tun_info->key.tun_id), 0); |
2e15ea39 PS |
442 | |
443 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
039f5062 PS |
444 | |
445 | iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE, | |
446 | key->tos, key->ttl, df, false); | |
2e15ea39 PS |
447 | return; |
448 | ||
449 | err_free_rt: | |
450 | ip_rt_put(rt); | |
451 | err_free_skb: | |
452 | kfree_skb(skb); | |
453 | dev->stats.tx_dropped++; | |
454 | } | |
455 | ||
fc4099f1 PS |
456 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
457 | { | |
458 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
459 | struct rtable *rt; | |
460 | struct flowi4 fl4; | |
461 | ||
462 | if (ip_tunnel_info_af(info) != AF_INET) | |
463 | return -EINVAL; | |
464 | ||
465 | rt = gre_get_rt(skb, dev, &fl4, &info->key); | |
466 | if (IS_ERR(rt)) | |
467 | return PTR_ERR(rt); | |
468 | ||
469 | ip_rt_put(rt); | |
470 | info->key.u.ipv4.src = fl4.saddr; | |
471 | return 0; | |
472 | } | |
473 | ||
c5441932 PS |
474 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
475 | struct net_device *dev) | |
476 | { | |
477 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
478 | const struct iphdr *tnl_params; | |
1da177e4 | 479 | |
2e15ea39 | 480 | if (tunnel->collect_md) { |
2090714e | 481 | gre_fb_xmit(skb, dev, skb->protocol); |
2e15ea39 PS |
482 | return NETDEV_TX_OK; |
483 | } | |
484 | ||
c5441932 PS |
485 | if (dev->header_ops) { |
486 | /* Need space for new headers */ | |
487 | if (skb_cow_head(skb, dev->needed_headroom - | |
2bac7cb3 | 488 | (tunnel->hlen + sizeof(struct iphdr)))) |
c5441932 | 489 | goto free_skb; |
1da177e4 | 490 | |
c5441932 | 491 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 492 | |
c5441932 PS |
493 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
494 | * to gre header. | |
495 | */ | |
496 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); | |
8a0033a9 | 497 | skb_reset_mac_header(skb); |
c5441932 PS |
498 | } else { |
499 | if (skb_cow_head(skb, dev->needed_headroom)) | |
500 | goto free_skb; | |
1da177e4 | 501 | |
c5441932 | 502 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
503 | } |
504 | ||
aed069df AD |
505 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
506 | goto free_skb; | |
8a0033a9 | 507 | |
c5441932 | 508 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
6ed10654 | 509 | return NETDEV_TX_OK; |
1da177e4 | 510 | |
c5441932 | 511 | free_skb: |
3acfa1e7 | 512 | kfree_skb(skb); |
c5441932 | 513 | dev->stats.tx_dropped++; |
6ed10654 | 514 | return NETDEV_TX_OK; |
1da177e4 LT |
515 | } |
516 | ||
c5441932 PS |
517 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
518 | struct net_device *dev) | |
ee34c1eb | 519 | { |
c5441932 | 520 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 521 | |
2e15ea39 | 522 | if (tunnel->collect_md) { |
2090714e | 523 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
2e15ea39 PS |
524 | return NETDEV_TX_OK; |
525 | } | |
526 | ||
aed069df AD |
527 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
528 | goto free_skb; | |
ee34c1eb | 529 | |
c5441932 PS |
530 | if (skb_cow_head(skb, dev->needed_headroom)) |
531 | goto free_skb; | |
42aa9162 | 532 | |
c5441932 | 533 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
c5441932 | 534 | return NETDEV_TX_OK; |
ee34c1eb | 535 | |
c5441932 | 536 | free_skb: |
3acfa1e7 | 537 | kfree_skb(skb); |
c5441932 PS |
538 | dev->stats.tx_dropped++; |
539 | return NETDEV_TX_OK; | |
ee34c1eb MS |
540 | } |
541 | ||
c5441932 PS |
542 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
543 | struct ifreq *ifr, int cmd) | |
1da177e4 | 544 | { |
4565e991 | 545 | int err; |
1da177e4 | 546 | struct ip_tunnel_parm p; |
1da177e4 | 547 | |
c5441932 PS |
548 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
549 | return -EFAULT; | |
6c734fb8 CW |
550 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
551 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
552 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
553 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
554 | return -EINVAL; | |
1da177e4 | 555 | } |
c5441932 PS |
556 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
557 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); | |
1da177e4 | 558 | |
c5441932 PS |
559 | err = ip_tunnel_ioctl(dev, &p, cmd); |
560 | if (err) | |
561 | return err; | |
1da177e4 | 562 | |
95f5c64c TH |
563 | p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags); |
564 | p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags); | |
c5441932 PS |
565 | |
566 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567 | return -EFAULT; | |
1da177e4 LT |
568 | return 0; |
569 | } | |
570 | ||
1da177e4 LT |
571 | /* Nice toy. Unfortunately, useless in real life :-) |
572 | It allows to construct virtual multiprotocol broadcast "LAN" | |
573 | over the Internet, provided multicast routing is tuned. | |
574 | ||
575 | ||
576 | I have no idea was this bicycle invented before me, | |
577 | so that I had to set ARPHRD_IPGRE to a random value. | |
578 | I have an impression, that Cisco could make something similar, | |
579 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 580 | |
1da177e4 LT |
581 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
582 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
583 | ||
584 | ping -t 255 224.66.66.66 | |
585 | ||
586 | If nobody answers, mbone does not work. | |
587 | ||
588 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
589 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
590 | ifconfig Universe up | |
591 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
592 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
593 | ftp 10.66.66.66 | |
594 | ... | |
595 | ftp fec0:6666:6666::193.233.7.65 | |
596 | ... | |
1da177e4 | 597 | */ |
3b04ddde SH |
598 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
599 | unsigned short type, | |
1507850b | 600 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 601 | { |
2941a486 | 602 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
603 | struct iphdr *iph; |
604 | struct gre_base_hdr *greh; | |
1da177e4 | 605 | |
c5441932 PS |
606 | iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph)); |
607 | greh = (struct gre_base_hdr *)(iph+1); | |
95f5c64c | 608 | greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); |
c5441932 | 609 | greh->protocol = htons(type); |
1da177e4 | 610 | |
c5441932 | 611 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 612 | |
c5441932 | 613 | /* Set the source hardware address. */ |
1da177e4 LT |
614 | if (saddr) |
615 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 616 | if (daddr) |
1da177e4 | 617 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 618 | if (iph->daddr) |
77a482bd | 619 | return t->hlen + sizeof(*iph); |
e905a9ed | 620 | |
c5441932 | 621 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
622 | } |
623 | ||
6a5f44d7 TT |
624 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
625 | { | |
b71d1d42 | 626 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
627 | memcpy(haddr, &iph->saddr, 4); |
628 | return 4; | |
629 | } | |
630 | ||
3b04ddde SH |
631 | static const struct header_ops ipgre_header_ops = { |
632 | .create = ipgre_header, | |
6a5f44d7 | 633 | .parse = ipgre_header_parse, |
3b04ddde SH |
634 | }; |
635 | ||
6a5f44d7 | 636 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
637 | static int ipgre_open(struct net_device *dev) |
638 | { | |
2941a486 | 639 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 640 | |
f97c1e0c | 641 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
642 | struct flowi4 fl4; |
643 | struct rtable *rt; | |
644 | ||
b57708ad | 645 | rt = ip_route_output_gre(t->net, &fl4, |
cbb1e85f DM |
646 | t->parms.iph.daddr, |
647 | t->parms.iph.saddr, | |
648 | t->parms.o_key, | |
649 | RT_TOS(t->parms.iph.tos), | |
650 | t->parms.link); | |
b23dd4fe | 651 | if (IS_ERR(rt)) |
1da177e4 | 652 | return -EADDRNOTAVAIL; |
d8d1f30b | 653 | dev = rt->dst.dev; |
1da177e4 | 654 | ip_rt_put(rt); |
51456b29 | 655 | if (!__in_dev_get_rtnl(dev)) |
1da177e4 LT |
656 | return -EADDRNOTAVAIL; |
657 | t->mlink = dev->ifindex; | |
e5ed6399 | 658 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
659 | } |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int ipgre_close(struct net_device *dev) | |
664 | { | |
2941a486 | 665 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 666 | |
f97c1e0c | 667 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 668 | struct in_device *in_dev; |
b57708ad | 669 | in_dev = inetdev_by_index(t->net, t->mlink); |
8723e1b4 | 670 | if (in_dev) |
1da177e4 | 671 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
672 | } |
673 | return 0; | |
674 | } | |
1da177e4 LT |
675 | #endif |
676 | ||
b8c26a33 SH |
677 | static const struct net_device_ops ipgre_netdev_ops = { |
678 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 679 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
680 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
681 | .ndo_open = ipgre_open, | |
682 | .ndo_stop = ipgre_close, | |
683 | #endif | |
c5441932 | 684 | .ndo_start_xmit = ipgre_xmit, |
b8c26a33 | 685 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
c5441932 PS |
686 | .ndo_change_mtu = ip_tunnel_change_mtu, |
687 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 688 | .ndo_get_iflink = ip_tunnel_get_iflink, |
b8c26a33 SH |
689 | }; |
690 | ||
6b78f16e ED |
691 | #define GRE_FEATURES (NETIF_F_SG | \ |
692 | NETIF_F_FRAGLIST | \ | |
693 | NETIF_F_HIGHDMA | \ | |
694 | NETIF_F_HW_CSUM) | |
695 | ||
1da177e4 LT |
696 | static void ipgre_tunnel_setup(struct net_device *dev) |
697 | { | |
b8c26a33 | 698 | dev->netdev_ops = &ipgre_netdev_ops; |
5a455275 | 699 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
700 | ip_tunnel_setup(dev, ipgre_net_id); |
701 | } | |
1da177e4 | 702 | |
c5441932 PS |
703 | static void __gre_tunnel_init(struct net_device *dev) |
704 | { | |
705 | struct ip_tunnel *tunnel; | |
4565e991 | 706 | int t_hlen; |
c5441932 PS |
707 | |
708 | tunnel = netdev_priv(dev); | |
95f5c64c | 709 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
c5441932 PS |
710 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
711 | ||
4565e991 TH |
712 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
713 | ||
714 | t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
715 | ||
716 | dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; | |
717 | dev->mtu = ETH_DATA_LEN - t_hlen - 4; | |
6b78f16e | 718 | |
b57708ad | 719 | dev->features |= GRE_FEATURES; |
6b78f16e | 720 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
721 | |
722 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
a0ca153f AD |
723 | /* TCP offload with GRE SEQ is not supported, nor |
724 | * can we support 2 levels of outer headers requiring | |
725 | * an update. | |
726 | */ | |
727 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
728 | (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { | |
729 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
730 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
731 | } | |
732 | ||
c5441932 PS |
733 | /* Can use a lockless transmit, unless we generate |
734 | * output sequences | |
735 | */ | |
736 | dev->features |= NETIF_F_LLTX; | |
737 | } | |
1da177e4 LT |
738 | } |
739 | ||
740 | static int ipgre_tunnel_init(struct net_device *dev) | |
741 | { | |
c5441932 PS |
742 | struct ip_tunnel *tunnel = netdev_priv(dev); |
743 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 744 | |
c5441932 | 745 | __gre_tunnel_init(dev); |
1da177e4 | 746 | |
c5441932 PS |
747 | memcpy(dev->dev_addr, &iph->saddr, 4); |
748 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 749 | |
c5441932 | 750 | dev->flags = IFF_NOARP; |
02875878 | 751 | netif_keep_dst(dev); |
c5441932 | 752 | dev->addr_len = 4; |
1da177e4 | 753 | |
a64b04d8 | 754 | if (iph->daddr && !tunnel->collect_md) { |
1da177e4 | 755 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 756 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
757 | if (!iph->saddr) |
758 | return -EINVAL; | |
759 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 760 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
761 | } |
762 | #endif | |
a64b04d8 | 763 | } else if (!tunnel->collect_md) { |
6a5f44d7 | 764 | dev->header_ops = &ipgre_header_ops; |
a64b04d8 | 765 | } |
1da177e4 | 766 | |
c5441932 | 767 | return ip_tunnel_init(dev); |
1da177e4 LT |
768 | } |
769 | ||
9f57c67c PS |
770 | static const struct gre_protocol ipgre_protocol = { |
771 | .handler = gre_rcv, | |
772 | .err_handler = gre_err, | |
1da177e4 LT |
773 | }; |
774 | ||
2c8c1e72 | 775 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 776 | { |
c5441932 | 777 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
778 | } |
779 | ||
2c8c1e72 | 780 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 | 781 | { |
c5441932 | 782 | struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id); |
6c742e71 | 783 | ip_tunnel_delete_net(itn, &ipgre_link_ops); |
59a4c759 PE |
784 | } |
785 | ||
786 | static struct pernet_operations ipgre_net_ops = { | |
787 | .init = ipgre_init_net, | |
788 | .exit = ipgre_exit_net, | |
cfb8fbf2 | 789 | .id = &ipgre_net_id, |
c5441932 | 790 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 791 | }; |
1da177e4 | 792 | |
c19e654d HX |
793 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
794 | { | |
795 | __be16 flags; | |
796 | ||
797 | if (!data) | |
798 | return 0; | |
799 | ||
800 | flags = 0; | |
801 | if (data[IFLA_GRE_IFLAGS]) | |
802 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
803 | if (data[IFLA_GRE_OFLAGS]) | |
804 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
805 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
806 | return -EINVAL; | |
807 | ||
946b636f JB |
808 | if (data[IFLA_GRE_COLLECT_METADATA] && |
809 | data[IFLA_GRE_ENCAP_TYPE] && | |
810 | nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) | |
811 | return -EINVAL; | |
812 | ||
c19e654d HX |
813 | return 0; |
814 | } | |
815 | ||
e1a80002 HX |
816 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
817 | { | |
818 | __be32 daddr; | |
819 | ||
820 | if (tb[IFLA_ADDRESS]) { | |
821 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
822 | return -EINVAL; | |
823 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
824 | return -EADDRNOTAVAIL; | |
825 | } | |
826 | ||
827 | if (!data) | |
828 | goto out; | |
829 | ||
830 | if (data[IFLA_GRE_REMOTE]) { | |
831 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
832 | if (!daddr) | |
833 | return -EINVAL; | |
834 | } | |
835 | ||
836 | out: | |
837 | return ipgre_tunnel_validate(tb, data); | |
838 | } | |
839 | ||
2e15ea39 PS |
840 | static void ipgre_netlink_parms(struct net_device *dev, |
841 | struct nlattr *data[], | |
842 | struct nlattr *tb[], | |
843 | struct ip_tunnel_parm *parms) | |
c19e654d | 844 | { |
7bb82d92 | 845 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
846 | |
847 | parms->iph.protocol = IPPROTO_GRE; | |
848 | ||
849 | if (!data) | |
850 | return; | |
851 | ||
852 | if (data[IFLA_GRE_LINK]) | |
853 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
854 | ||
855 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 856 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
857 | |
858 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 859 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
860 | |
861 | if (data[IFLA_GRE_IKEY]) | |
862 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
863 | ||
864 | if (data[IFLA_GRE_OKEY]) | |
865 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
866 | ||
867 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 868 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
869 | |
870 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 871 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
872 | |
873 | if (data[IFLA_GRE_TTL]) | |
874 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
875 | ||
876 | if (data[IFLA_GRE_TOS]) | |
877 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
878 | ||
879 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
880 | parms->iph.frag_off = htons(IP_DF); | |
2e15ea39 PS |
881 | |
882 | if (data[IFLA_GRE_COLLECT_METADATA]) { | |
883 | struct ip_tunnel *t = netdev_priv(dev); | |
884 | ||
885 | t->collect_md = true; | |
e271c7b4 JB |
886 | if (dev->type == ARPHRD_IPGRE) |
887 | dev->type = ARPHRD_NONE; | |
2e15ea39 | 888 | } |
c19e654d HX |
889 | } |
890 | ||
4565e991 TH |
891 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
892 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], | |
893 | struct ip_tunnel_encap *ipencap) | |
894 | { | |
895 | bool ret = false; | |
896 | ||
897 | memset(ipencap, 0, sizeof(*ipencap)); | |
898 | ||
899 | if (!data) | |
900 | return ret; | |
901 | ||
902 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
903 | ret = true; | |
904 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
905 | } | |
906 | ||
907 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
908 | ret = true; | |
909 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
910 | } | |
911 | ||
912 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
913 | ret = true; | |
3e97fa70 | 914 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
4565e991 TH |
915 | } |
916 | ||
917 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
918 | ret = true; | |
3e97fa70 | 919 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
4565e991 TH |
920 | } |
921 | ||
922 | return ret; | |
923 | } | |
924 | ||
c5441932 | 925 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 926 | { |
c5441932 | 927 | __gre_tunnel_init(dev); |
bec94d43 | 928 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
e1a80002 | 929 | |
c5441932 | 930 | return ip_tunnel_init(dev); |
e1a80002 HX |
931 | } |
932 | ||
c5441932 PS |
933 | static const struct net_device_ops gre_tap_netdev_ops = { |
934 | .ndo_init = gre_tap_init, | |
935 | .ndo_uninit = ip_tunnel_uninit, | |
936 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
937 | .ndo_set_mac_address = eth_mac_addr, |
938 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 PS |
939 | .ndo_change_mtu = ip_tunnel_change_mtu, |
940 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 941 | .ndo_get_iflink = ip_tunnel_get_iflink, |
fc4099f1 | 942 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
b8c26a33 SH |
943 | }; |
944 | ||
e1a80002 HX |
945 | static void ipgre_tap_setup(struct net_device *dev) |
946 | { | |
e1a80002 | 947 | ether_setup(dev); |
d13b161c JB |
948 | dev->netdev_ops = &gre_tap_netdev_ops; |
949 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
950 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c5441932 | 951 | ip_tunnel_setup(dev, gre_tap_net_id); |
e1a80002 HX |
952 | } |
953 | ||
c5441932 PS |
954 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
955 | struct nlattr *tb[], struct nlattr *data[]) | |
c19e654d | 956 | { |
c5441932 | 957 | struct ip_tunnel_parm p; |
4565e991 TH |
958 | struct ip_tunnel_encap ipencap; |
959 | ||
960 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
961 | struct ip_tunnel *t = netdev_priv(dev); | |
962 | int err = ip_tunnel_encap_setup(t, &ipencap); | |
963 | ||
964 | if (err < 0) | |
965 | return err; | |
966 | } | |
c19e654d | 967 | |
2e15ea39 | 968 | ipgre_netlink_parms(dev, data, tb, &p); |
c5441932 | 969 | return ip_tunnel_newlink(dev, tb, &p); |
c19e654d HX |
970 | } |
971 | ||
972 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
973 | struct nlattr *data[]) | |
974 | { | |
c19e654d | 975 | struct ip_tunnel_parm p; |
4565e991 TH |
976 | struct ip_tunnel_encap ipencap; |
977 | ||
978 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
979 | struct ip_tunnel *t = netdev_priv(dev); | |
980 | int err = ip_tunnel_encap_setup(t, &ipencap); | |
981 | ||
982 | if (err < 0) | |
983 | return err; | |
984 | } | |
c19e654d | 985 | |
2e15ea39 | 986 | ipgre_netlink_parms(dev, data, tb, &p); |
c5441932 | 987 | return ip_tunnel_changelink(dev, tb, &p); |
c19e654d HX |
988 | } |
989 | ||
990 | static size_t ipgre_get_size(const struct net_device *dev) | |
991 | { | |
992 | return | |
993 | /* IFLA_GRE_LINK */ | |
994 | nla_total_size(4) + | |
995 | /* IFLA_GRE_IFLAGS */ | |
996 | nla_total_size(2) + | |
997 | /* IFLA_GRE_OFLAGS */ | |
998 | nla_total_size(2) + | |
999 | /* IFLA_GRE_IKEY */ | |
1000 | nla_total_size(4) + | |
1001 | /* IFLA_GRE_OKEY */ | |
1002 | nla_total_size(4) + | |
1003 | /* IFLA_GRE_LOCAL */ | |
1004 | nla_total_size(4) + | |
1005 | /* IFLA_GRE_REMOTE */ | |
1006 | nla_total_size(4) + | |
1007 | /* IFLA_GRE_TTL */ | |
1008 | nla_total_size(1) + | |
1009 | /* IFLA_GRE_TOS */ | |
1010 | nla_total_size(1) + | |
1011 | /* IFLA_GRE_PMTUDISC */ | |
1012 | nla_total_size(1) + | |
4565e991 TH |
1013 | /* IFLA_GRE_ENCAP_TYPE */ |
1014 | nla_total_size(2) + | |
1015 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1016 | nla_total_size(2) + | |
1017 | /* IFLA_GRE_ENCAP_SPORT */ | |
1018 | nla_total_size(2) + | |
1019 | /* IFLA_GRE_ENCAP_DPORT */ | |
1020 | nla_total_size(2) + | |
2e15ea39 PS |
1021 | /* IFLA_GRE_COLLECT_METADATA */ |
1022 | nla_total_size(0) + | |
c19e654d HX |
1023 | 0; |
1024 | } | |
1025 | ||
1026 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1027 | { | |
1028 | struct ip_tunnel *t = netdev_priv(dev); | |
1029 | struct ip_tunnel_parm *p = &t->parms; | |
1030 | ||
f3756b79 | 1031 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
95f5c64c TH |
1032 | nla_put_be16(skb, IFLA_GRE_IFLAGS, |
1033 | gre_tnl_flags_to_gre_flags(p->i_flags)) || | |
1034 | nla_put_be16(skb, IFLA_GRE_OFLAGS, | |
1035 | gre_tnl_flags_to_gre_flags(p->o_flags)) || | |
f3756b79 DM |
1036 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1037 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1038 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
1039 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
f3756b79 DM |
1040 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
1041 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1042 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
1043 | !!(p->iph.frag_off & htons(IP_DF)))) | |
1044 | goto nla_put_failure; | |
4565e991 TH |
1045 | |
1046 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1047 | t->encap.type) || | |
3e97fa70 SD |
1048 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
1049 | t->encap.sport) || | |
1050 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1051 | t->encap.dport) || | |
4565e991 | 1052 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
e1b2cb65 | 1053 | t->encap.flags)) |
4565e991 TH |
1054 | goto nla_put_failure; |
1055 | ||
2e15ea39 PS |
1056 | if (t->collect_md) { |
1057 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) | |
1058 | goto nla_put_failure; | |
1059 | } | |
1060 | ||
c19e654d HX |
1061 | return 0; |
1062 | ||
1063 | nla_put_failure: | |
1064 | return -EMSGSIZE; | |
1065 | } | |
1066 | ||
1067 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1068 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1069 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1070 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1071 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1072 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1073 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1074 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1075 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1076 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1077 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
4565e991 TH |
1078 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1079 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1080 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1081 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2e15ea39 | 1082 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
c19e654d HX |
1083 | }; |
1084 | ||
1085 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1086 | .kind = "gre", | |
1087 | .maxtype = IFLA_GRE_MAX, | |
1088 | .policy = ipgre_policy, | |
1089 | .priv_size = sizeof(struct ip_tunnel), | |
1090 | .setup = ipgre_tunnel_setup, | |
1091 | .validate = ipgre_tunnel_validate, | |
1092 | .newlink = ipgre_newlink, | |
1093 | .changelink = ipgre_changelink, | |
c5441932 | 1094 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
1095 | .get_size = ipgre_get_size, |
1096 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1097 | .get_link_net = ip_tunnel_get_link_net, |
c19e654d HX |
1098 | }; |
1099 | ||
e1a80002 HX |
1100 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1101 | .kind = "gretap", | |
1102 | .maxtype = IFLA_GRE_MAX, | |
1103 | .policy = ipgre_policy, | |
1104 | .priv_size = sizeof(struct ip_tunnel), | |
1105 | .setup = ipgre_tap_setup, | |
1106 | .validate = ipgre_tap_validate, | |
1107 | .newlink = ipgre_newlink, | |
1108 | .changelink = ipgre_changelink, | |
c5441932 | 1109 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
1110 | .get_size = ipgre_get_size, |
1111 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1112 | .get_link_net = ip_tunnel_get_link_net, |
e1a80002 HX |
1113 | }; |
1114 | ||
b2acd1dc PS |
1115 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1116 | u8 name_assign_type) | |
1117 | { | |
1118 | struct nlattr *tb[IFLA_MAX + 1]; | |
1119 | struct net_device *dev; | |
106da663 | 1120 | LIST_HEAD(list_kill); |
b2acd1dc PS |
1121 | struct ip_tunnel *t; |
1122 | int err; | |
1123 | ||
1124 | memset(&tb, 0, sizeof(tb)); | |
1125 | ||
1126 | dev = rtnl_create_link(net, name, name_assign_type, | |
1127 | &ipgre_tap_ops, tb); | |
1128 | if (IS_ERR(dev)) | |
1129 | return dev; | |
1130 | ||
1131 | /* Configure flow based GRE device. */ | |
1132 | t = netdev_priv(dev); | |
1133 | t->collect_md = true; | |
1134 | ||
1135 | err = ipgre_newlink(net, dev, tb, NULL); | |
106da663 ND |
1136 | if (err < 0) { |
1137 | free_netdev(dev); | |
1138 | return ERR_PTR(err); | |
1139 | } | |
7e059158 DW |
1140 | |
1141 | /* openvswitch users expect packet sizes to be unrestricted, | |
1142 | * so set the largest MTU we can. | |
1143 | */ | |
1144 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); | |
1145 | if (err) | |
1146 | goto out; | |
1147 | ||
da6f1da8 ND |
1148 | err = rtnl_configure_link(dev, NULL); |
1149 | if (err < 0) | |
1150 | goto out; | |
1151 | ||
b2acd1dc PS |
1152 | return dev; |
1153 | out: | |
106da663 ND |
1154 | ip_tunnel_dellink(dev, &list_kill); |
1155 | unregister_netdevice_many(&list_kill); | |
b2acd1dc PS |
1156 | return ERR_PTR(err); |
1157 | } | |
1158 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); | |
1159 | ||
c5441932 PS |
1160 | static int __net_init ipgre_tap_init_net(struct net *net) |
1161 | { | |
2e15ea39 | 1162 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
c5441932 PS |
1163 | } |
1164 | ||
1165 | static void __net_exit ipgre_tap_exit_net(struct net *net) | |
1166 | { | |
1167 | struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id); | |
6c742e71 | 1168 | ip_tunnel_delete_net(itn, &ipgre_tap_ops); |
c5441932 PS |
1169 | } |
1170 | ||
1171 | static struct pernet_operations ipgre_tap_net_ops = { | |
1172 | .init = ipgre_tap_init_net, | |
1173 | .exit = ipgre_tap_exit_net, | |
1174 | .id = &gre_tap_net_id, | |
1175 | .size = sizeof(struct ip_tunnel_net), | |
1176 | }; | |
1da177e4 LT |
1177 | |
1178 | static int __init ipgre_init(void) | |
1179 | { | |
1180 | int err; | |
1181 | ||
058bd4d2 | 1182 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1183 | |
cfb8fbf2 | 1184 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1185 | if (err < 0) |
c2892f02 AD |
1186 | return err; |
1187 | ||
c5441932 PS |
1188 | err = register_pernet_device(&ipgre_tap_net_ops); |
1189 | if (err < 0) | |
1190 | goto pnet_tap_faied; | |
1191 | ||
9f57c67c | 1192 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1193 | if (err < 0) { |
058bd4d2 | 1194 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1195 | goto add_proto_failed; |
1196 | } | |
7daa0004 | 1197 | |
c19e654d HX |
1198 | err = rtnl_link_register(&ipgre_link_ops); |
1199 | if (err < 0) | |
1200 | goto rtnl_link_failed; | |
1201 | ||
e1a80002 HX |
1202 | err = rtnl_link_register(&ipgre_tap_ops); |
1203 | if (err < 0) | |
1204 | goto tap_ops_failed; | |
1205 | ||
c5441932 | 1206 | return 0; |
c19e654d | 1207 | |
e1a80002 HX |
1208 | tap_ops_failed: |
1209 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1210 | rtnl_link_failed: |
9f57c67c | 1211 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1212 | add_proto_failed: |
c5441932 PS |
1213 | unregister_pernet_device(&ipgre_tap_net_ops); |
1214 | pnet_tap_faied: | |
c2892f02 | 1215 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1216 | return err; |
1da177e4 LT |
1217 | } |
1218 | ||
db44575f | 1219 | static void __exit ipgre_fini(void) |
1da177e4 | 1220 | { |
e1a80002 | 1221 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1222 | rtnl_link_unregister(&ipgre_link_ops); |
9f57c67c | 1223 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c5441932 | 1224 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1225 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | module_init(ipgre_init); | |
1229 | module_exit(ipgre_fini); | |
1230 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1231 | MODULE_ALIAS_RTNL_LINK("gre"); |
1232 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1233 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1234 | MODULE_ALIAS_NETDEV("gretap0"); |