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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
e905a9ed | 3 | * Linux NET3: GRE over IP protocol decoder. |
1da177e4 LT |
4 | * |
5 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) | |
1da177e4 LT |
6 | */ |
7 | ||
afd46503 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
4fc268d2 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
1da177e4 | 13 | #include <linux/kernel.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7c0f6ba6 | 15 | #include <linux/uaccess.h> |
1da177e4 LT |
16 | #include <linux/skbuff.h> |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/tcp.h> | |
20 | #include <linux/udp.h> | |
21 | #include <linux/if_arp.h> | |
2e15ea39 | 22 | #include <linux/if_vlan.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/in6.h> | |
25 | #include <linux/inetdevice.h> | |
26 | #include <linux/igmp.h> | |
27 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 28 | #include <linux/etherdevice.h> |
46f25dff | 29 | #include <linux/if_ether.h> |
1da177e4 LT |
30 | |
31 | #include <net/sock.h> | |
32 | #include <net/ip.h> | |
33 | #include <net/icmp.h> | |
34 | #include <net/protocol.h> | |
c5441932 | 35 | #include <net/ip_tunnels.h> |
1da177e4 LT |
36 | #include <net/arp.h> |
37 | #include <net/checksum.h> | |
38 | #include <net/dsfield.h> | |
39 | #include <net/inet_ecn.h> | |
40 | #include <net/xfrm.h> | |
59a4c759 PE |
41 | #include <net/net_namespace.h> |
42 | #include <net/netns/generic.h> | |
c19e654d | 43 | #include <net/rtnetlink.h> |
00959ade | 44 | #include <net/gre.h> |
2e15ea39 | 45 | #include <net/dst_metadata.h> |
84e54fe0 | 46 | #include <net/erspan.h> |
1da177e4 | 47 | |
1da177e4 LT |
48 | /* |
49 | Problems & solutions | |
50 | -------------------- | |
51 | ||
52 | 1. The most important issue is detecting local dead loops. | |
53 | They would cause complete host lockup in transmit, which | |
54 | would be "resolved" by stack overflow or, if queueing is enabled, | |
55 | with infinite looping in net_bh. | |
56 | ||
57 | We cannot track such dead loops during route installation, | |
58 | it is infeasible task. The most general solutions would be | |
59 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 60 | and silently drop packet when it expires. It is a good |
bff52857 | 61 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
62 | skb, even if no tunneling is used. |
63 | ||
6d0722a2 ED |
64 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
65 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
66 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
67 | |
68 | 2. Networking dead loops would not kill routers, but would really | |
69 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
70 | if we copy it from packet being encapsulated to upper header. | |
71 | It is very good solution, but it introduces two problems: | |
72 | ||
73 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
74 | do not work over tunnels. | |
75 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
76 | so that this problem would be solved and traceroute output | |
77 | would even more informative. This idea appeared to be wrong: | |
78 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
79 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
80 | return only 8 bytes of payload. It is the end. | |
81 | ||
82 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
83 | we should search for another solution. | |
84 | ||
85 | One of them is to parse packet trying to detect inner encapsulation | |
86 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 87 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
88 | |
89 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
90 | We force DF flag on tunnels with preconfigured hop limit, | |
91 | that is ALL. :-) Well, it does not remove the problem completely, | |
92 | but exponential growth of network traffic is changed to linear | |
93 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 94 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
95 | Yes, it is not good if there exists a router in the loop, |
96 | which does not force DF, even when encapsulating packets have DF set. | |
97 | But it is not our problem! Nobody could accuse us, we made | |
98 | all that we could make. Even if it is your gated who injected | |
99 | fatal route to network, even if it were you who configured | |
100 | fatal static route: you are innocent. :-) | |
101 | ||
1da177e4 LT |
102 | Alexey Kuznetsov. |
103 | */ | |
104 | ||
eccc1bb8 | 105 | static bool log_ecn_error = true; |
106 | module_param(log_ecn_error, bool, 0644); | |
107 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
108 | ||
c19e654d | 109 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 | 110 | static int ipgre_tunnel_init(struct net_device *dev); |
1a66a836 | 111 | static void erspan_build_header(struct sk_buff *skb, |
c69de58b | 112 | u32 id, u32 index, |
a3222dc9 | 113 | bool truncate, bool is_ipv4); |
eb8ce741 | 114 | |
c7d03a00 AD |
115 | static unsigned int ipgre_net_id __read_mostly; |
116 | static unsigned int gre_tap_net_id __read_mostly; | |
84e54fe0 | 117 | static unsigned int erspan_net_id __read_mostly; |
1da177e4 | 118 | |
32bbd879 SB |
119 | static int 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; | |
20e1954f | 141 | unsigned int data_len = 0; |
1da177e4 | 142 | struct ip_tunnel *t; |
1da177e4 | 143 | |
32bbd879 SB |
144 | if (tpi->proto == htons(ETH_P_TEB)) |
145 | itn = net_generic(net, gre_tap_net_id); | |
146 | else if (tpi->proto == htons(ETH_P_ERSPAN) || | |
147 | tpi->proto == htons(ETH_P_ERSPAN2)) | |
148 | itn = net_generic(net, erspan_net_id); | |
149 | else | |
150 | itn = net_generic(net, ipgre_net_id); | |
151 | ||
152 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); | |
153 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, | |
154 | iph->daddr, iph->saddr, tpi->key); | |
155 | ||
156 | if (!t) | |
157 | return -ENOENT; | |
158 | ||
1da177e4 LT |
159 | switch (type) { |
160 | default: | |
161 | case ICMP_PARAMETERPROB: | |
32bbd879 | 162 | return 0; |
1da177e4 LT |
163 | |
164 | case ICMP_DEST_UNREACH: | |
165 | switch (code) { | |
166 | case ICMP_SR_FAILED: | |
167 | case ICMP_PORT_UNREACH: | |
168 | /* Impossible event. */ | |
32bbd879 | 169 | return 0; |
1da177e4 LT |
170 | default: |
171 | /* All others are translated to HOST_UNREACH. | |
172 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
173 | I believe they are just ether pollution. --ANK | |
174 | */ | |
175 | break; | |
176 | } | |
177 | break; | |
9f57c67c | 178 | |
1da177e4 LT |
179 | case ICMP_TIME_EXCEEDED: |
180 | if (code != ICMP_EXC_TTL) | |
32bbd879 | 181 | return 0; |
20e1954f | 182 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 183 | break; |
55be7a9c DM |
184 | |
185 | case ICMP_REDIRECT: | |
186 | break; | |
1da177e4 LT |
187 | } |
188 | ||
9b8c6d7b ED |
189 | #if IS_ENABLED(CONFIG_IPV6) |
190 | if (tpi->proto == htons(ETH_P_IPV6) && | |
20e1954f ED |
191 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, |
192 | type, data_len)) | |
32bbd879 | 193 | return 0; |
9b8c6d7b ED |
194 | #endif |
195 | ||
36393395 | 196 | if (t->parms.iph.daddr == 0 || |
f97c1e0c | 197 | ipv4_is_multicast(t->parms.iph.daddr)) |
32bbd879 | 198 | return 0; |
1da177e4 LT |
199 | |
200 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
32bbd879 | 201 | return 0; |
1da177e4 | 202 | |
da6185d8 | 203 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
204 | t->err_count++; |
205 | else | |
206 | t->err_count = 1; | |
207 | t->err_time = jiffies; | |
32bbd879 SB |
208 | |
209 | return 0; | |
9f57c67c PS |
210 | } |
211 | ||
212 | static void gre_err(struct sk_buff *skb, u32 info) | |
213 | { | |
214 | /* All the routers (except for Linux) return only | |
215 | * 8 bytes of packet payload. It means, that precise relaying of | |
216 | * ICMP in the real Internet is absolutely infeasible. | |
217 | * | |
218 | * Moreover, Cisco "wise men" put GRE key to the third word | |
219 | * in GRE header. It makes impossible maintaining even soft | |
220 | * state for keyed | |
221 | * GRE tunnels with enabled checksum. Tell them "thank you". | |
222 | * | |
223 | * Well, I wonder, rfc1812 was written by Cisco employee, | |
224 | * what the hell these idiots break standards established | |
225 | * by themselves??? | |
226 | */ | |
227 | ||
e582615a | 228 | const struct iphdr *iph = (struct iphdr *)skb->data; |
9f57c67c PS |
229 | const int type = icmp_hdr(skb)->type; |
230 | const int code = icmp_hdr(skb)->code; | |
231 | struct tnl_ptk_info tpi; | |
9f57c67c | 232 | |
b0350d51 HY |
233 | if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IP), |
234 | iph->ihl * 4) < 0) | |
235 | return; | |
9f57c67c PS |
236 | |
237 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
238 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d888f396 | 239 | skb->dev->ifindex, IPPROTO_GRE); |
9f57c67c PS |
240 | return; |
241 | } | |
242 | if (type == ICMP_REDIRECT) { | |
1042caa7 MÅ» |
243 | ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, |
244 | IPPROTO_GRE); | |
9f57c67c PS |
245 | return; |
246 | } | |
247 | ||
248 | ipgre_err(skb, info, &tpi); | |
1da177e4 LT |
249 | } |
250 | ||
84e54fe0 WT |
251 | static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
252 | int gre_hdr_len) | |
253 | { | |
254 | struct net *net = dev_net(skb->dev); | |
255 | struct metadata_dst *tun_dst = NULL; | |
1d7e2ed2 | 256 | struct erspan_base_hdr *ershdr; |
84e54fe0 WT |
257 | struct ip_tunnel_net *itn; |
258 | struct ip_tunnel *tunnel; | |
84e54fe0 | 259 | const struct iphdr *iph; |
3df19283 | 260 | struct erspan_md2 *md2; |
1d7e2ed2 | 261 | int ver; |
84e54fe0 WT |
262 | int len; |
263 | ||
264 | itn = net_generic(net, erspan_net_id); | |
84e54fe0 WT |
265 | |
266 | iph = ip_hdr(skb); | |
1d7e2ed2 | 267 | ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len); |
c69de58b | 268 | ver = ershdr->ver; |
84e54fe0 | 269 | |
84e54fe0 WT |
270 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, |
271 | tpi->flags | TUNNEL_KEY, | |
272 | iph->saddr, iph->daddr, tpi->key); | |
273 | ||
274 | if (tunnel) { | |
1d7e2ed2 WT |
275 | len = gre_hdr_len + erspan_hdr_len(ver); |
276 | if (unlikely(!pskb_may_pull(skb, len))) | |
ae3e1337 | 277 | return PACKET_REJECT; |
1d7e2ed2 | 278 | |
84e54fe0 | 279 | if (__iptunnel_pull_header(skb, |
1d7e2ed2 | 280 | len, |
84e54fe0 WT |
281 | htons(ETH_P_TEB), |
282 | false, false) < 0) | |
283 | goto drop; | |
284 | ||
1a66a836 | 285 | if (tunnel->collect_md) { |
492b67e2 | 286 | struct erspan_metadata *pkt_md, *md; |
1a66a836 | 287 | struct ip_tunnel_info *info; |
492b67e2 | 288 | unsigned char *gh; |
1a66a836 WT |
289 | __be64 tun_id; |
290 | __be16 flags; | |
291 | ||
292 | tpi->flags |= TUNNEL_KEY; | |
293 | flags = tpi->flags; | |
294 | tun_id = key32_to_tunnel_id(tpi->key); | |
295 | ||
296 | tun_dst = ip_tun_rx_dst(skb, flags, | |
297 | tun_id, sizeof(*md)); | |
298 | if (!tun_dst) | |
299 | return PACKET_REJECT; | |
300 | ||
492b67e2 LB |
301 | /* skb can be uncloned in __iptunnel_pull_header, so |
302 | * old pkt_md is no longer valid and we need to reset | |
303 | * it | |
304 | */ | |
305 | gh = skb_network_header(skb) + | |
306 | skb_network_header_len(skb); | |
307 | pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + | |
308 | sizeof(*ershdr)); | |
1a66a836 | 309 | md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
f551c91d | 310 | md->version = ver; |
3df19283 WT |
311 | md2 = &md->u.md2; |
312 | memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : | |
313 | ERSPAN_V2_MDSIZE); | |
f551c91d | 314 | |
1a66a836 WT |
315 | info = &tun_dst->u.tun_info; |
316 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; | |
317 | info->options_len = sizeof(*md); | |
1a66a836 WT |
318 | } |
319 | ||
84e54fe0 WT |
320 | skb_reset_mac_header(skb); |
321 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
322 | return PACKET_RCVD; | |
323 | } | |
5a64506b HY |
324 | return PACKET_REJECT; |
325 | ||
84e54fe0 WT |
326 | drop: |
327 | kfree_skb(skb); | |
328 | return PACKET_RCVD; | |
329 | } | |
330 | ||
125372fa JB |
331 | static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
332 | struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) | |
1da177e4 | 333 | { |
2e15ea39 | 334 | struct metadata_dst *tun_dst = NULL; |
b71d1d42 | 335 | const struct iphdr *iph; |
1da177e4 | 336 | struct ip_tunnel *tunnel; |
1da177e4 | 337 | |
c5441932 | 338 | iph = ip_hdr(skb); |
bda7bb46 PS |
339 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
340 | iph->saddr, iph->daddr, tpi->key); | |
e1a80002 | 341 | |
d2083287 | 342 | if (tunnel) { |
c0d59da7 | 343 | const struct iphdr *tnl_params; |
344 | ||
125372fa JB |
345 | if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, |
346 | raw_proto, false) < 0) | |
244a797b JB |
347 | goto drop; |
348 | ||
e271c7b4 JB |
349 | if (tunnel->dev->type != ARPHRD_NONE) |
350 | skb_pop_mac_header(skb); | |
351 | else | |
352 | skb_reset_mac_header(skb); | |
c0d59da7 | 353 | |
354 | tnl_params = &tunnel->parms.iph; | |
355 | if (tunnel->collect_md || tnl_params->daddr == 0) { | |
c29a70d2 PS |
356 | __be16 flags; |
357 | __be64 tun_id; | |
2e15ea39 | 358 | |
c29a70d2 | 359 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
d817f432 | 360 | tun_id = key32_to_tunnel_id(tpi->key); |
c29a70d2 | 361 | tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); |
2e15ea39 PS |
362 | if (!tun_dst) |
363 | return PACKET_REJECT; | |
2e15ea39 PS |
364 | } |
365 | ||
366 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
bda7bb46 | 367 | return PACKET_RCVD; |
1da177e4 | 368 | } |
125372fa | 369 | return PACKET_NEXT; |
244a797b JB |
370 | |
371 | drop: | |
372 | kfree_skb(skb); | |
373 | return PACKET_RCVD; | |
1da177e4 LT |
374 | } |
375 | ||
125372fa JB |
376 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
377 | int hdr_len) | |
378 | { | |
379 | struct net *net = dev_net(skb->dev); | |
380 | struct ip_tunnel_net *itn; | |
381 | int res; | |
382 | ||
383 | if (tpi->proto == htons(ETH_P_TEB)) | |
384 | itn = net_generic(net, gre_tap_net_id); | |
385 | else | |
386 | itn = net_generic(net, ipgre_net_id); | |
387 | ||
388 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); | |
389 | if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { | |
390 | /* ipgre tunnels in collect metadata mode should receive | |
391 | * also ETH_P_TEB traffic. | |
392 | */ | |
393 | itn = net_generic(net, ipgre_net_id); | |
394 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); | |
395 | } | |
396 | return res; | |
397 | } | |
398 | ||
9f57c67c PS |
399 | static int gre_rcv(struct sk_buff *skb) |
400 | { | |
401 | struct tnl_ptk_info tpi; | |
402 | bool csum_err = false; | |
95f5c64c | 403 | int hdr_len; |
9f57c67c PS |
404 | |
405 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
406 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { | |
407 | /* Looped back packet, drop it! */ | |
408 | if (rt_is_output_route(skb_rtable(skb))) | |
409 | goto drop; | |
410 | } | |
411 | #endif | |
412 | ||
e582615a | 413 | hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); |
f132ae7c | 414 | if (hdr_len < 0) |
95f5c64c TH |
415 | goto drop; |
416 | ||
f551c91d WT |
417 | if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
418 | tpi.proto == htons(ETH_P_ERSPAN2))) { | |
84e54fe0 WT |
419 | if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
420 | return 0; | |
dd8d5b8c | 421 | goto out; |
84e54fe0 WT |
422 | } |
423 | ||
244a797b | 424 | if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
9f57c67c PS |
425 | return 0; |
426 | ||
dd8d5b8c | 427 | out: |
9f57c67c PS |
428 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
429 | drop: | |
430 | kfree_skb(skb); | |
431 | return 0; | |
432 | } | |
433 | ||
c5441932 PS |
434 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
435 | const struct iphdr *tnl_params, | |
436 | __be16 proto) | |
437 | { | |
438 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1da177e4 | 439 | |
c5441932 PS |
440 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
441 | tunnel->o_seqno++; | |
1da177e4 | 442 | |
c5441932 | 443 | /* Push GRE header. */ |
182a352d TH |
444 | gre_build_header(skb, tunnel->tun_hlen, |
445 | tunnel->parms.o_flags, proto, tunnel->parms.o_key, | |
446 | htonl(tunnel->o_seqno)); | |
54bc9bac | 447 | |
bf3d6a8f | 448 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
c5441932 | 449 | } |
1da177e4 | 450 | |
aed069df | 451 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
b2acd1dc | 452 | { |
6fa79666 | 453 | return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
b2acd1dc PS |
454 | } |
455 | ||
862a03c3 WT |
456 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
457 | __be16 proto) | |
458 | { | |
77a5196a | 459 | struct ip_tunnel *tunnel = netdev_priv(dev); |
862a03c3 WT |
460 | struct ip_tunnel_info *tun_info; |
461 | const struct ip_tunnel_key *key; | |
862a03c3 | 462 | int tunnel_hlen; |
962924fa | 463 | __be16 flags; |
862a03c3 WT |
464 | |
465 | tun_info = skb_tunnel_info(skb); | |
466 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
467 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
468 | goto err_free_skb; | |
469 | ||
470 | key = &tun_info->key; | |
471 | tunnel_hlen = gre_calc_hlen(key->tun_flags); | |
472 | ||
962924fa | 473 | if (skb_cow_head(skb, dev->needed_headroom)) |
474 | goto err_free_skb; | |
2e15ea39 PS |
475 | |
476 | /* Push Tunnel header. */ | |
aed069df | 477 | if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
962924fa | 478 | goto err_free_skb; |
2e15ea39 | 479 | |
77a5196a WT |
480 | flags = tun_info->key.tun_flags & |
481 | (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); | |
cba65321 | 482 | gre_build_header(skb, tunnel_hlen, flags, proto, |
77a5196a | 483 | tunnel_id_to_key32(tun_info->key.tun_id), |
15746394 | 484 | (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0); |
2e15ea39 | 485 | |
962924fa | 486 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
039f5062 | 487 | |
2e15ea39 PS |
488 | return; |
489 | ||
2e15ea39 PS |
490 | err_free_skb: |
491 | kfree_skb(skb); | |
492 | dev->stats.tx_dropped++; | |
493 | } | |
494 | ||
20704bd1 | 495 | static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev) |
1a66a836 WT |
496 | { |
497 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
498 | struct ip_tunnel_info *tun_info; | |
499 | const struct ip_tunnel_key *key; | |
500 | struct erspan_metadata *md; | |
1a66a836 | 501 | bool truncate = false; |
962924fa | 502 | __be16 proto; |
1a66a836 | 503 | int tunnel_hlen; |
f551c91d | 504 | int version; |
1baf5ebf | 505 | int nhoff; |
d5db21a3 | 506 | int thoff; |
1a66a836 WT |
507 | |
508 | tun_info = skb_tunnel_info(skb); | |
509 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
510 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
511 | goto err_free_skb; | |
512 | ||
513 | key = &tun_info->key; | |
256c87c1 | 514 | if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
962924fa | 515 | goto err_free_skb; |
2eb8d6d2 | 516 | if (tun_info->options_len < sizeof(*md)) |
962924fa | 517 | goto err_free_skb; |
2eb8d6d2 | 518 | md = ip_tunnel_info_opts(tun_info); |
1a66a836 WT |
519 | |
520 | /* ERSPAN has fixed 8 byte GRE header */ | |
f551c91d WT |
521 | version = md->version; |
522 | tunnel_hlen = 8 + erspan_hdr_len(version); | |
1a66a836 | 523 | |
962924fa | 524 | if (skb_cow_head(skb, dev->needed_headroom)) |
525 | goto err_free_skb; | |
1a66a836 WT |
526 | |
527 | if (gre_handle_offloads(skb, false)) | |
962924fa | 528 | goto err_free_skb; |
1a66a836 | 529 | |
f192970d WT |
530 | if (skb->len > dev->mtu + dev->hard_header_len) { |
531 | pskb_trim(skb, dev->mtu + dev->hard_header_len); | |
1a66a836 WT |
532 | truncate = true; |
533 | } | |
534 | ||
1baf5ebf WT |
535 | nhoff = skb_network_header(skb) - skb_mac_header(skb); |
536 | if (skb->protocol == htons(ETH_P_IP) && | |
537 | (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) | |
538 | truncate = true; | |
d5db21a3 WT |
539 | |
540 | thoff = skb_transport_header(skb) - skb_mac_header(skb); | |
541 | if (skb->protocol == htons(ETH_P_IPV6) && | |
542 | (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) | |
543 | truncate = true; | |
1baf5ebf | 544 | |
f551c91d | 545 | if (version == 1) { |
c69de58b | 546 | erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)), |
f551c91d | 547 | ntohl(md->u.index), truncate, true); |
20704bd1 | 548 | proto = htons(ETH_P_ERSPAN); |
f551c91d | 549 | } else if (version == 2) { |
c69de58b WT |
550 | erspan_build_header_v2(skb, |
551 | ntohl(tunnel_id_to_key32(key->tun_id)), | |
552 | md->u.md2.dir, | |
553 | get_hwid(&md->u.md2), | |
554 | truncate, true); | |
20704bd1 | 555 | proto = htons(ETH_P_ERSPAN2); |
f551c91d | 556 | } else { |
962924fa | 557 | goto err_free_skb; |
f551c91d | 558 | } |
1a66a836 WT |
559 | |
560 | gre_build_header(skb, 8, TUNNEL_SEQ, | |
20704bd1 | 561 | proto, 0, htonl(tunnel->o_seqno++)); |
1a66a836 | 562 | |
962924fa | 563 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
1a66a836 | 564 | |
1a66a836 WT |
565 | return; |
566 | ||
1a66a836 WT |
567 | err_free_skb: |
568 | kfree_skb(skb); | |
569 | dev->stats.tx_dropped++; | |
570 | } | |
571 | ||
fc4099f1 PS |
572 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
573 | { | |
574 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
962924fa | 575 | const struct ip_tunnel_key *key; |
fc4099f1 PS |
576 | struct rtable *rt; |
577 | struct flowi4 fl4; | |
578 | ||
579 | if (ip_tunnel_info_af(info) != AF_INET) | |
580 | return -EINVAL; | |
581 | ||
962924fa | 582 | key = &info->key; |
583 | ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src, | |
584 | tunnel_id_to_key32(key->tun_id), key->tos, 0, | |
24ba1440 | 585 | skb->mark, skb_get_hash(skb)); |
962924fa | 586 | rt = ip_route_output_key(dev_net(dev), &fl4); |
fc4099f1 PS |
587 | if (IS_ERR(rt)) |
588 | return PTR_ERR(rt); | |
589 | ||
590 | ip_rt_put(rt); | |
591 | info->key.u.ipv4.src = fl4.saddr; | |
592 | return 0; | |
593 | } | |
594 | ||
c5441932 PS |
595 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
596 | struct net_device *dev) | |
597 | { | |
598 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
599 | const struct iphdr *tnl_params; | |
1da177e4 | 600 | |
cb9f1b78 WB |
601 | if (!pskb_inet_may_pull(skb)) |
602 | goto free_skb; | |
603 | ||
2e15ea39 | 604 | if (tunnel->collect_md) { |
2090714e | 605 | gre_fb_xmit(skb, dev, skb->protocol); |
2e15ea39 PS |
606 | return NETDEV_TX_OK; |
607 | } | |
608 | ||
c5441932 PS |
609 | if (dev->header_ops) { |
610 | /* Need space for new headers */ | |
611 | if (skb_cow_head(skb, dev->needed_headroom - | |
2bac7cb3 | 612 | (tunnel->hlen + sizeof(struct iphdr)))) |
c5441932 | 613 | goto free_skb; |
1da177e4 | 614 | |
c5441932 | 615 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 616 | |
c5441932 PS |
617 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
618 | * to gre header. | |
619 | */ | |
620 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); | |
8a0033a9 | 621 | skb_reset_mac_header(skb); |
c5441932 PS |
622 | } else { |
623 | if (skb_cow_head(skb, dev->needed_headroom)) | |
624 | goto free_skb; | |
1da177e4 | 625 | |
c5441932 | 626 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
627 | } |
628 | ||
aed069df AD |
629 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
630 | goto free_skb; | |
8a0033a9 | 631 | |
c5441932 | 632 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
6ed10654 | 633 | return NETDEV_TX_OK; |
1da177e4 | 634 | |
c5441932 | 635 | free_skb: |
3acfa1e7 | 636 | kfree_skb(skb); |
c5441932 | 637 | dev->stats.tx_dropped++; |
6ed10654 | 638 | return NETDEV_TX_OK; |
1da177e4 LT |
639 | } |
640 | ||
84e54fe0 WT |
641 | static netdev_tx_t erspan_xmit(struct sk_buff *skb, |
642 | struct net_device *dev) | |
643 | { | |
644 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
645 | bool truncate = false; | |
20704bd1 | 646 | __be16 proto; |
84e54fe0 | 647 | |
cb9f1b78 WB |
648 | if (!pskb_inet_may_pull(skb)) |
649 | goto free_skb; | |
650 | ||
1a66a836 | 651 | if (tunnel->collect_md) { |
20704bd1 | 652 | erspan_fb_xmit(skb, dev); |
1a66a836 WT |
653 | return NETDEV_TX_OK; |
654 | } | |
655 | ||
84e54fe0 WT |
656 | if (gre_handle_offloads(skb, false)) |
657 | goto free_skb; | |
658 | ||
659 | if (skb_cow_head(skb, dev->needed_headroom)) | |
660 | goto free_skb; | |
661 | ||
f192970d WT |
662 | if (skb->len > dev->mtu + dev->hard_header_len) { |
663 | pskb_trim(skb, dev->mtu + dev->hard_header_len); | |
84e54fe0 WT |
664 | truncate = true; |
665 | } | |
666 | ||
667 | /* Push ERSPAN header */ | |
20704bd1 | 668 | if (tunnel->erspan_ver == 1) { |
c69de58b WT |
669 | erspan_build_header(skb, ntohl(tunnel->parms.o_key), |
670 | tunnel->index, | |
f551c91d | 671 | truncate, true); |
20704bd1 XL |
672 | proto = htons(ETH_P_ERSPAN); |
673 | } else if (tunnel->erspan_ver == 2) { | |
c69de58b | 674 | erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key), |
f551c91d WT |
675 | tunnel->dir, tunnel->hwid, |
676 | truncate, true); | |
20704bd1 XL |
677 | proto = htons(ETH_P_ERSPAN2); |
678 | } else { | |
02f99df1 | 679 | goto free_skb; |
20704bd1 | 680 | } |
f551c91d | 681 | |
84e54fe0 | 682 | tunnel->parms.o_flags &= ~TUNNEL_KEY; |
20704bd1 | 683 | __gre_xmit(skb, dev, &tunnel->parms.iph, proto); |
84e54fe0 WT |
684 | return NETDEV_TX_OK; |
685 | ||
686 | free_skb: | |
687 | kfree_skb(skb); | |
688 | dev->stats.tx_dropped++; | |
689 | return NETDEV_TX_OK; | |
690 | } | |
691 | ||
c5441932 PS |
692 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
693 | struct net_device *dev) | |
ee34c1eb | 694 | { |
c5441932 | 695 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 696 | |
cb9f1b78 WB |
697 | if (!pskb_inet_may_pull(skb)) |
698 | goto free_skb; | |
699 | ||
2e15ea39 | 700 | if (tunnel->collect_md) { |
2090714e | 701 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
2e15ea39 PS |
702 | return NETDEV_TX_OK; |
703 | } | |
704 | ||
aed069df AD |
705 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
706 | goto free_skb; | |
ee34c1eb | 707 | |
c5441932 PS |
708 | if (skb_cow_head(skb, dev->needed_headroom)) |
709 | goto free_skb; | |
42aa9162 | 710 | |
c5441932 | 711 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
c5441932 | 712 | return NETDEV_TX_OK; |
ee34c1eb | 713 | |
c5441932 | 714 | free_skb: |
3acfa1e7 | 715 | kfree_skb(skb); |
c5441932 PS |
716 | dev->stats.tx_dropped++; |
717 | return NETDEV_TX_OK; | |
ee34c1eb MS |
718 | } |
719 | ||
dd9d598c XL |
720 | static void ipgre_link_update(struct net_device *dev, bool set_mtu) |
721 | { | |
722 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
723 | int len; | |
724 | ||
725 | len = tunnel->tun_hlen; | |
726 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); | |
727 | len = tunnel->tun_hlen - len; | |
728 | tunnel->hlen = tunnel->hlen + len; | |
729 | ||
730 | dev->needed_headroom = dev->needed_headroom + len; | |
731 | if (set_mtu) | |
732 | dev->mtu = max_t(int, dev->mtu - len, 68); | |
733 | ||
734 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
735 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
736 | tunnel->encap.type == TUNNEL_ENCAP_NONE) { | |
737 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
738 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1cc5954f SD |
739 | } else { |
740 | dev->features &= ~NETIF_F_GSO_SOFTWARE; | |
741 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
dd9d598c XL |
742 | } |
743 | dev->features |= NETIF_F_LLTX; | |
1cc5954f SD |
744 | } else { |
745 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
746 | dev->features &= ~(NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE); | |
dd9d598c XL |
747 | } |
748 | } | |
749 | ||
c5441932 PS |
750 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
751 | struct ifreq *ifr, int cmd) | |
1da177e4 | 752 | { |
1da177e4 | 753 | struct ip_tunnel_parm p; |
a0efab67 | 754 | int err; |
1da177e4 | 755 | |
c5441932 PS |
756 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
757 | return -EFAULT; | |
a0efab67 | 758 | |
6c734fb8 CW |
759 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
760 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
a0efab67 XL |
761 | p.iph.ihl != 5 || (p.iph.frag_off & htons(~IP_DF)) || |
762 | ((p.i_flags | p.o_flags) & (GRE_VERSION | GRE_ROUTING))) | |
6c734fb8 | 763 | return -EINVAL; |
1da177e4 | 764 | } |
a0efab67 | 765 | |
c5441932 PS |
766 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
767 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); | |
1da177e4 | 768 | |
c5441932 PS |
769 | err = ip_tunnel_ioctl(dev, &p, cmd); |
770 | if (err) | |
771 | return err; | |
1da177e4 | 772 | |
a0efab67 XL |
773 | if (cmd == SIOCCHGTUNNEL) { |
774 | struct ip_tunnel *t = netdev_priv(dev); | |
775 | ||
776 | t->parms.i_flags = p.i_flags; | |
777 | t->parms.o_flags = p.o_flags; | |
778 | ||
779 | if (strcmp(dev->rtnl_link_ops->kind, "erspan")) | |
780 | ipgre_link_update(dev, true); | |
781 | } | |
782 | ||
95f5c64c TH |
783 | p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags); |
784 | p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags); | |
c5441932 PS |
785 | |
786 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
787 | return -EFAULT; | |
a0efab67 | 788 | |
1da177e4 LT |
789 | return 0; |
790 | } | |
791 | ||
1da177e4 LT |
792 | /* Nice toy. Unfortunately, useless in real life :-) |
793 | It allows to construct virtual multiprotocol broadcast "LAN" | |
794 | over the Internet, provided multicast routing is tuned. | |
795 | ||
796 | ||
797 | I have no idea was this bicycle invented before me, | |
798 | so that I had to set ARPHRD_IPGRE to a random value. | |
799 | I have an impression, that Cisco could make something similar, | |
800 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 801 | |
1da177e4 LT |
802 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
803 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
804 | ||
805 | ping -t 255 224.66.66.66 | |
806 | ||
807 | If nobody answers, mbone does not work. | |
808 | ||
809 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
810 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
811 | ifconfig Universe up | |
812 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
813 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
814 | ftp 10.66.66.66 | |
815 | ... | |
816 | ftp fec0:6666:6666::193.233.7.65 | |
817 | ... | |
1da177e4 | 818 | */ |
3b04ddde SH |
819 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
820 | unsigned short type, | |
1507850b | 821 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 822 | { |
2941a486 | 823 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
824 | struct iphdr *iph; |
825 | struct gre_base_hdr *greh; | |
1da177e4 | 826 | |
d58ff351 | 827 | iph = skb_push(skb, t->hlen + sizeof(*iph)); |
c5441932 | 828 | greh = (struct gre_base_hdr *)(iph+1); |
95f5c64c | 829 | greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); |
c5441932 | 830 | greh->protocol = htons(type); |
1da177e4 | 831 | |
c5441932 | 832 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 833 | |
c5441932 | 834 | /* Set the source hardware address. */ |
1da177e4 LT |
835 | if (saddr) |
836 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 837 | if (daddr) |
1da177e4 | 838 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 839 | if (iph->daddr) |
77a482bd | 840 | return t->hlen + sizeof(*iph); |
e905a9ed | 841 | |
c5441932 | 842 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
843 | } |
844 | ||
6a5f44d7 TT |
845 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
846 | { | |
b71d1d42 | 847 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
848 | memcpy(haddr, &iph->saddr, 4); |
849 | return 4; | |
850 | } | |
851 | ||
3b04ddde SH |
852 | static const struct header_ops ipgre_header_ops = { |
853 | .create = ipgre_header, | |
6a5f44d7 | 854 | .parse = ipgre_header_parse, |
3b04ddde SH |
855 | }; |
856 | ||
6a5f44d7 | 857 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
858 | static int ipgre_open(struct net_device *dev) |
859 | { | |
2941a486 | 860 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 861 | |
f97c1e0c | 862 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
863 | struct flowi4 fl4; |
864 | struct rtable *rt; | |
865 | ||
b57708ad | 866 | rt = ip_route_output_gre(t->net, &fl4, |
cbb1e85f DM |
867 | t->parms.iph.daddr, |
868 | t->parms.iph.saddr, | |
869 | t->parms.o_key, | |
870 | RT_TOS(t->parms.iph.tos), | |
871 | t->parms.link); | |
b23dd4fe | 872 | if (IS_ERR(rt)) |
1da177e4 | 873 | return -EADDRNOTAVAIL; |
d8d1f30b | 874 | dev = rt->dst.dev; |
1da177e4 | 875 | ip_rt_put(rt); |
51456b29 | 876 | if (!__in_dev_get_rtnl(dev)) |
1da177e4 LT |
877 | return -EADDRNOTAVAIL; |
878 | t->mlink = dev->ifindex; | |
e5ed6399 | 879 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
880 | } |
881 | return 0; | |
882 | } | |
883 | ||
884 | static int ipgre_close(struct net_device *dev) | |
885 | { | |
2941a486 | 886 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 887 | |
f97c1e0c | 888 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 889 | struct in_device *in_dev; |
b57708ad | 890 | in_dev = inetdev_by_index(t->net, t->mlink); |
8723e1b4 | 891 | if (in_dev) |
1da177e4 | 892 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
893 | } |
894 | return 0; | |
895 | } | |
1da177e4 LT |
896 | #endif |
897 | ||
b8c26a33 SH |
898 | static const struct net_device_ops ipgre_netdev_ops = { |
899 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 900 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
901 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
902 | .ndo_open = ipgre_open, | |
903 | .ndo_stop = ipgre_close, | |
904 | #endif | |
c5441932 | 905 | .ndo_start_xmit = ipgre_xmit, |
b8c26a33 | 906 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
c5441932 PS |
907 | .ndo_change_mtu = ip_tunnel_change_mtu, |
908 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 909 | .ndo_get_iflink = ip_tunnel_get_iflink, |
b8c26a33 SH |
910 | }; |
911 | ||
6b78f16e ED |
912 | #define GRE_FEATURES (NETIF_F_SG | \ |
913 | NETIF_F_FRAGLIST | \ | |
914 | NETIF_F_HIGHDMA | \ | |
915 | NETIF_F_HW_CSUM) | |
916 | ||
1da177e4 LT |
917 | static void ipgre_tunnel_setup(struct net_device *dev) |
918 | { | |
b8c26a33 | 919 | dev->netdev_ops = &ipgre_netdev_ops; |
5a455275 | 920 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
921 | ip_tunnel_setup(dev, ipgre_net_id); |
922 | } | |
1da177e4 | 923 | |
c5441932 PS |
924 | static void __gre_tunnel_init(struct net_device *dev) |
925 | { | |
926 | struct ip_tunnel *tunnel; | |
927 | ||
928 | tunnel = netdev_priv(dev); | |
95f5c64c | 929 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
c5441932 PS |
930 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
931 | ||
4565e991 TH |
932 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
933 | ||
b57708ad | 934 | dev->features |= GRE_FEATURES; |
6b78f16e | 935 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
936 | |
937 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
a0ca153f AD |
938 | /* TCP offload with GRE SEQ is not supported, nor |
939 | * can we support 2 levels of outer headers requiring | |
940 | * an update. | |
941 | */ | |
942 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
943 | (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { | |
944 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
945 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
946 | } | |
947 | ||
c5441932 PS |
948 | /* Can use a lockless transmit, unless we generate |
949 | * output sequences | |
950 | */ | |
951 | dev->features |= NETIF_F_LLTX; | |
952 | } | |
1da177e4 LT |
953 | } |
954 | ||
955 | static int ipgre_tunnel_init(struct net_device *dev) | |
956 | { | |
c5441932 PS |
957 | struct ip_tunnel *tunnel = netdev_priv(dev); |
958 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 959 | |
c5441932 | 960 | __gre_tunnel_init(dev); |
1da177e4 | 961 | |
c5441932 PS |
962 | memcpy(dev->dev_addr, &iph->saddr, 4); |
963 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 964 | |
c5441932 | 965 | dev->flags = IFF_NOARP; |
02875878 | 966 | netif_keep_dst(dev); |
c5441932 | 967 | dev->addr_len = 4; |
1da177e4 | 968 | |
a64b04d8 | 969 | if (iph->daddr && !tunnel->collect_md) { |
1da177e4 | 970 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 971 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
972 | if (!iph->saddr) |
973 | return -EINVAL; | |
974 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 975 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
976 | } |
977 | #endif | |
a64b04d8 | 978 | } else if (!tunnel->collect_md) { |
6a5f44d7 | 979 | dev->header_ops = &ipgre_header_ops; |
a64b04d8 | 980 | } |
1da177e4 | 981 | |
c5441932 | 982 | return ip_tunnel_init(dev); |
1da177e4 LT |
983 | } |
984 | ||
9f57c67c PS |
985 | static const struct gre_protocol ipgre_protocol = { |
986 | .handler = gre_rcv, | |
987 | .err_handler = gre_err, | |
1da177e4 LT |
988 | }; |
989 | ||
2c8c1e72 | 990 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 991 | { |
c5441932 | 992 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
993 | } |
994 | ||
64bc1781 | 995 | static void __net_exit ipgre_exit_batch_net(struct list_head *list_net) |
59a4c759 | 996 | { |
64bc1781 | 997 | ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops); |
59a4c759 PE |
998 | } |
999 | ||
1000 | static struct pernet_operations ipgre_net_ops = { | |
1001 | .init = ipgre_init_net, | |
64bc1781 | 1002 | .exit_batch = ipgre_exit_batch_net, |
cfb8fbf2 | 1003 | .id = &ipgre_net_id, |
c5441932 | 1004 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 1005 | }; |
1da177e4 | 1006 | |
a8b8a889 MS |
1007 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
1008 | struct netlink_ext_ack *extack) | |
c19e654d HX |
1009 | { |
1010 | __be16 flags; | |
1011 | ||
1012 | if (!data) | |
1013 | return 0; | |
1014 | ||
1015 | flags = 0; | |
1016 | if (data[IFLA_GRE_IFLAGS]) | |
1017 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1018 | if (data[IFLA_GRE_OFLAGS]) | |
1019 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1020 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1021 | return -EINVAL; | |
1022 | ||
946b636f JB |
1023 | if (data[IFLA_GRE_COLLECT_METADATA] && |
1024 | data[IFLA_GRE_ENCAP_TYPE] && | |
1025 | nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) | |
1026 | return -EINVAL; | |
1027 | ||
c19e654d HX |
1028 | return 0; |
1029 | } | |
1030 | ||
a8b8a889 MS |
1031 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1032 | struct netlink_ext_ack *extack) | |
e1a80002 HX |
1033 | { |
1034 | __be32 daddr; | |
1035 | ||
1036 | if (tb[IFLA_ADDRESS]) { | |
1037 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1038 | return -EINVAL; | |
1039 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1040 | return -EADDRNOTAVAIL; | |
1041 | } | |
1042 | ||
1043 | if (!data) | |
1044 | goto out; | |
1045 | ||
1046 | if (data[IFLA_GRE_REMOTE]) { | |
1047 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1048 | if (!daddr) | |
1049 | return -EINVAL; | |
1050 | } | |
1051 | ||
1052 | out: | |
a8b8a889 | 1053 | return ipgre_tunnel_validate(tb, data, extack); |
e1a80002 HX |
1054 | } |
1055 | ||
84e54fe0 WT |
1056 | static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], |
1057 | struct netlink_ext_ack *extack) | |
1058 | { | |
1059 | __be16 flags = 0; | |
1060 | int ret; | |
1061 | ||
1062 | if (!data) | |
1063 | return 0; | |
1064 | ||
1065 | ret = ipgre_tap_validate(tb, data, extack); | |
1066 | if (ret) | |
1067 | return ret; | |
1068 | ||
1069 | /* ERSPAN should only have GRE sequence and key flag */ | |
1a66a836 WT |
1070 | if (data[IFLA_GRE_OFLAGS]) |
1071 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1072 | if (data[IFLA_GRE_IFLAGS]) | |
1073 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1074 | if (!data[IFLA_GRE_COLLECT_METADATA] && | |
1075 | flags != (GRE_SEQ | GRE_KEY)) | |
84e54fe0 WT |
1076 | return -EINVAL; |
1077 | ||
1078 | /* ERSPAN Session ID only has 10-bit. Since we reuse | |
1079 | * 32-bit key field as ID, check it's range. | |
1080 | */ | |
1081 | if (data[IFLA_GRE_IKEY] && | |
1082 | (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) | |
1083 | return -EINVAL; | |
1084 | ||
1085 | if (data[IFLA_GRE_OKEY] && | |
1086 | (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) | |
1087 | return -EINVAL; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | ||
22a59be8 | 1092 | static int ipgre_netlink_parms(struct net_device *dev, |
2e15ea39 PS |
1093 | struct nlattr *data[], |
1094 | struct nlattr *tb[], | |
9830ad4c CG |
1095 | struct ip_tunnel_parm *parms, |
1096 | __u32 *fwmark) | |
c19e654d | 1097 | { |
22a59be8 PP |
1098 | struct ip_tunnel *t = netdev_priv(dev); |
1099 | ||
7bb82d92 | 1100 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1101 | |
1102 | parms->iph.protocol = IPPROTO_GRE; | |
1103 | ||
1104 | if (!data) | |
22a59be8 | 1105 | return 0; |
c19e654d HX |
1106 | |
1107 | if (data[IFLA_GRE_LINK]) | |
1108 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1109 | ||
1110 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 1111 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
1112 | |
1113 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 1114 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
1115 | |
1116 | if (data[IFLA_GRE_IKEY]) | |
1117 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1118 | ||
1119 | if (data[IFLA_GRE_OKEY]) | |
1120 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1121 | ||
1122 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 1123 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1124 | |
1125 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 1126 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1127 | |
1128 | if (data[IFLA_GRE_TTL]) | |
1129 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1130 | ||
1131 | if (data[IFLA_GRE_TOS]) | |
1132 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1133 | ||
22a59be8 PP |
1134 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) { |
1135 | if (t->ignore_df) | |
1136 | return -EINVAL; | |
c19e654d | 1137 | parms->iph.frag_off = htons(IP_DF); |
22a59be8 | 1138 | } |
2e15ea39 PS |
1139 | |
1140 | if (data[IFLA_GRE_COLLECT_METADATA]) { | |
2e15ea39 | 1141 | t->collect_md = true; |
e271c7b4 JB |
1142 | if (dev->type == ARPHRD_IPGRE) |
1143 | dev->type = ARPHRD_NONE; | |
2e15ea39 | 1144 | } |
22a59be8 PP |
1145 | |
1146 | if (data[IFLA_GRE_IGNORE_DF]) { | |
1147 | if (nla_get_u8(data[IFLA_GRE_IGNORE_DF]) | |
1148 | && (parms->iph.frag_off & htons(IP_DF))) | |
1149 | return -EINVAL; | |
1150 | t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]); | |
1151 | } | |
1152 | ||
9830ad4c CG |
1153 | if (data[IFLA_GRE_FWMARK]) |
1154 | *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); | |
1155 | ||
e1f8f78f PM |
1156 | return 0; |
1157 | } | |
1158 | ||
1159 | static int erspan_netlink_parms(struct net_device *dev, | |
1160 | struct nlattr *data[], | |
1161 | struct nlattr *tb[], | |
1162 | struct ip_tunnel_parm *parms, | |
1163 | __u32 *fwmark) | |
1164 | { | |
1165 | struct ip_tunnel *t = netdev_priv(dev); | |
1166 | int err; | |
1167 | ||
1168 | err = ipgre_netlink_parms(dev, data, tb, parms, fwmark); | |
1169 | if (err) | |
1170 | return err; | |
32ca98fe PM |
1171 | if (!data) |
1172 | return 0; | |
e1f8f78f | 1173 | |
f551c91d WT |
1174 | if (data[IFLA_GRE_ERSPAN_VER]) { |
1175 | t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); | |
84e54fe0 | 1176 | |
f551c91d | 1177 | if (t->erspan_ver != 1 && t->erspan_ver != 2) |
84e54fe0 WT |
1178 | return -EINVAL; |
1179 | } | |
1180 | ||
f551c91d WT |
1181 | if (t->erspan_ver == 1) { |
1182 | if (data[IFLA_GRE_ERSPAN_INDEX]) { | |
1183 | t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); | |
1184 | if (t->index & ~INDEX_MASK) | |
1185 | return -EINVAL; | |
1186 | } | |
1187 | } else if (t->erspan_ver == 2) { | |
1188 | if (data[IFLA_GRE_ERSPAN_DIR]) { | |
1189 | t->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); | |
1190 | if (t->dir & ~(DIR_MASK >> DIR_OFFSET)) | |
1191 | return -EINVAL; | |
1192 | } | |
1193 | if (data[IFLA_GRE_ERSPAN_HWID]) { | |
1194 | t->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); | |
1195 | if (t->hwid & ~(HWID_MASK >> HWID_OFFSET)) | |
1196 | return -EINVAL; | |
1197 | } | |
1198 | } | |
1199 | ||
22a59be8 | 1200 | return 0; |
c19e654d HX |
1201 | } |
1202 | ||
4565e991 TH |
1203 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1204 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], | |
1205 | struct ip_tunnel_encap *ipencap) | |
1206 | { | |
1207 | bool ret = false; | |
1208 | ||
1209 | memset(ipencap, 0, sizeof(*ipencap)); | |
1210 | ||
1211 | if (!data) | |
1212 | return ret; | |
1213 | ||
1214 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
1215 | ret = true; | |
1216 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
1217 | } | |
1218 | ||
1219 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
1220 | ret = true; | |
1221 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
1222 | } | |
1223 | ||
1224 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
1225 | ret = true; | |
3e97fa70 | 1226 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
4565e991 TH |
1227 | } |
1228 | ||
1229 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
1230 | ret = true; | |
3e97fa70 | 1231 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
4565e991 TH |
1232 | } |
1233 | ||
1234 | return ret; | |
1235 | } | |
1236 | ||
c5441932 | 1237 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 1238 | { |
c5441932 | 1239 | __gre_tunnel_init(dev); |
bec94d43 | 1240 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d51711c0 | 1241 | netif_keep_dst(dev); |
e1a80002 | 1242 | |
c5441932 | 1243 | return ip_tunnel_init(dev); |
e1a80002 HX |
1244 | } |
1245 | ||
c5441932 PS |
1246 | static const struct net_device_ops gre_tap_netdev_ops = { |
1247 | .ndo_init = gre_tap_init, | |
1248 | .ndo_uninit = ip_tunnel_uninit, | |
1249 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
1250 | .ndo_set_mac_address = eth_mac_addr, |
1251 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 PS |
1252 | .ndo_change_mtu = ip_tunnel_change_mtu, |
1253 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 1254 | .ndo_get_iflink = ip_tunnel_get_iflink, |
fc4099f1 | 1255 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
b8c26a33 SH |
1256 | }; |
1257 | ||
84e54fe0 WT |
1258 | static int erspan_tunnel_init(struct net_device *dev) |
1259 | { | |
1260 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
84e54fe0 WT |
1261 | |
1262 | tunnel->tun_hlen = 8; | |
1263 | tunnel->parms.iph.protocol = IPPROTO_GRE; | |
c122fda2 | 1264 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
f551c91d | 1265 | erspan_hdr_len(tunnel->erspan_ver); |
84e54fe0 | 1266 | |
84e54fe0 WT |
1267 | dev->features |= GRE_FEATURES; |
1268 | dev->hw_features |= GRE_FEATURES; | |
1269 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c84bed44 | 1270 | netif_keep_dst(dev); |
84e54fe0 WT |
1271 | |
1272 | return ip_tunnel_init(dev); | |
1273 | } | |
1274 | ||
1275 | static const struct net_device_ops erspan_netdev_ops = { | |
1276 | .ndo_init = erspan_tunnel_init, | |
1277 | .ndo_uninit = ip_tunnel_uninit, | |
1278 | .ndo_start_xmit = erspan_xmit, | |
1279 | .ndo_set_mac_address = eth_mac_addr, | |
1280 | .ndo_validate_addr = eth_validate_addr, | |
1281 | .ndo_change_mtu = ip_tunnel_change_mtu, | |
1282 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1283 | .ndo_get_iflink = ip_tunnel_get_iflink, | |
1284 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, | |
1285 | }; | |
1286 | ||
e1a80002 HX |
1287 | static void ipgre_tap_setup(struct net_device *dev) |
1288 | { | |
e1a80002 | 1289 | ether_setup(dev); |
cfddd4c3 | 1290 | dev->max_mtu = 0; |
d13b161c JB |
1291 | dev->netdev_ops = &gre_tap_netdev_ops; |
1292 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1293 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c5441932 | 1294 | ip_tunnel_setup(dev, gre_tap_net_id); |
e1a80002 HX |
1295 | } |
1296 | ||
e1f8f78f PM |
1297 | static int |
1298 | ipgre_newlink_encap_setup(struct net_device *dev, struct nlattr *data[]) | |
c19e654d | 1299 | { |
4565e991 TH |
1300 | struct ip_tunnel_encap ipencap; |
1301 | ||
1302 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1303 | struct ip_tunnel *t = netdev_priv(dev); | |
e1f8f78f | 1304 | int err = ip_tunnel_encap_setup(t, &ipencap); |
4565e991 TH |
1305 | |
1306 | if (err < 0) | |
1307 | return err; | |
1308 | } | |
c19e654d | 1309 | |
e1f8f78f PM |
1310 | return 0; |
1311 | } | |
1312 | ||
1313 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, | |
1314 | struct nlattr *tb[], struct nlattr *data[], | |
1315 | struct netlink_ext_ack *extack) | |
1316 | { | |
1317 | struct ip_tunnel_parm p; | |
1318 | __u32 fwmark = 0; | |
1319 | int err; | |
1320 | ||
1321 | err = ipgre_newlink_encap_setup(dev, data); | |
1322 | if (err) | |
1323 | return err; | |
1324 | ||
9830ad4c | 1325 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
22a59be8 PP |
1326 | if (err < 0) |
1327 | return err; | |
9830ad4c | 1328 | return ip_tunnel_newlink(dev, tb, &p, fwmark); |
c19e654d HX |
1329 | } |
1330 | ||
e1f8f78f PM |
1331 | static int erspan_newlink(struct net *src_net, struct net_device *dev, |
1332 | struct nlattr *tb[], struct nlattr *data[], | |
1333 | struct netlink_ext_ack *extack) | |
1334 | { | |
1335 | struct ip_tunnel_parm p; | |
1336 | __u32 fwmark = 0; | |
1337 | int err; | |
1338 | ||
1339 | err = ipgre_newlink_encap_setup(dev, data); | |
1340 | if (err) | |
1341 | return err; | |
1342 | ||
1343 | err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); | |
1344 | if (err) | |
1345 | return err; | |
1346 | return ip_tunnel_newlink(dev, tb, &p, fwmark); | |
1347 | } | |
1348 | ||
c19e654d | 1349 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
ad744b22 MS |
1350 | struct nlattr *data[], |
1351 | struct netlink_ext_ack *extack) | |
c19e654d | 1352 | { |
9830ad4c | 1353 | struct ip_tunnel *t = netdev_priv(dev); |
9830ad4c | 1354 | __u32 fwmark = t->fwmark; |
dd9d598c | 1355 | struct ip_tunnel_parm p; |
22a59be8 | 1356 | int err; |
4565e991 | 1357 | |
e1f8f78f PM |
1358 | err = ipgre_newlink_encap_setup(dev, data); |
1359 | if (err) | |
1360 | return err; | |
c19e654d | 1361 | |
9830ad4c | 1362 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
22a59be8 PP |
1363 | if (err < 0) |
1364 | return err; | |
dd9d598c XL |
1365 | |
1366 | err = ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1367 | if (err < 0) | |
1368 | return err; | |
1369 | ||
1370 | t->parms.i_flags = p.i_flags; | |
1371 | t->parms.o_flags = p.o_flags; | |
1372 | ||
e1f8f78f PM |
1373 | ipgre_link_update(dev, !tb[IFLA_MTU]); |
1374 | ||
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | static int erspan_changelink(struct net_device *dev, struct nlattr *tb[], | |
1379 | struct nlattr *data[], | |
1380 | struct netlink_ext_ack *extack) | |
1381 | { | |
1382 | struct ip_tunnel *t = netdev_priv(dev); | |
1383 | __u32 fwmark = t->fwmark; | |
1384 | struct ip_tunnel_parm p; | |
1385 | int err; | |
1386 | ||
1387 | err = ipgre_newlink_encap_setup(dev, data); | |
1388 | if (err) | |
1389 | return err; | |
1390 | ||
1391 | err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); | |
1392 | if (err < 0) | |
1393 | return err; | |
1394 | ||
1395 | err = ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1396 | if (err < 0) | |
1397 | return err; | |
1398 | ||
1399 | t->parms.i_flags = p.i_flags; | |
1400 | t->parms.o_flags = p.o_flags; | |
dd9d598c XL |
1401 | |
1402 | return 0; | |
c19e654d HX |
1403 | } |
1404 | ||
1405 | static size_t ipgre_get_size(const struct net_device *dev) | |
1406 | { | |
1407 | return | |
1408 | /* IFLA_GRE_LINK */ | |
1409 | nla_total_size(4) + | |
1410 | /* IFLA_GRE_IFLAGS */ | |
1411 | nla_total_size(2) + | |
1412 | /* IFLA_GRE_OFLAGS */ | |
1413 | nla_total_size(2) + | |
1414 | /* IFLA_GRE_IKEY */ | |
1415 | nla_total_size(4) + | |
1416 | /* IFLA_GRE_OKEY */ | |
1417 | nla_total_size(4) + | |
1418 | /* IFLA_GRE_LOCAL */ | |
1419 | nla_total_size(4) + | |
1420 | /* IFLA_GRE_REMOTE */ | |
1421 | nla_total_size(4) + | |
1422 | /* IFLA_GRE_TTL */ | |
1423 | nla_total_size(1) + | |
1424 | /* IFLA_GRE_TOS */ | |
1425 | nla_total_size(1) + | |
1426 | /* IFLA_GRE_PMTUDISC */ | |
1427 | nla_total_size(1) + | |
4565e991 TH |
1428 | /* IFLA_GRE_ENCAP_TYPE */ |
1429 | nla_total_size(2) + | |
1430 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1431 | nla_total_size(2) + | |
1432 | /* IFLA_GRE_ENCAP_SPORT */ | |
1433 | nla_total_size(2) + | |
1434 | /* IFLA_GRE_ENCAP_DPORT */ | |
1435 | nla_total_size(2) + | |
2e15ea39 PS |
1436 | /* IFLA_GRE_COLLECT_METADATA */ |
1437 | nla_total_size(0) + | |
22a59be8 PP |
1438 | /* IFLA_GRE_IGNORE_DF */ |
1439 | nla_total_size(1) + | |
9830ad4c CG |
1440 | /* IFLA_GRE_FWMARK */ |
1441 | nla_total_size(4) + | |
84e54fe0 WT |
1442 | /* IFLA_GRE_ERSPAN_INDEX */ |
1443 | nla_total_size(4) + | |
f551c91d WT |
1444 | /* IFLA_GRE_ERSPAN_VER */ |
1445 | nla_total_size(1) + | |
1446 | /* IFLA_GRE_ERSPAN_DIR */ | |
1447 | nla_total_size(1) + | |
1448 | /* IFLA_GRE_ERSPAN_HWID */ | |
1449 | nla_total_size(2) + | |
c19e654d HX |
1450 | 0; |
1451 | } | |
1452 | ||
1453 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1454 | { | |
1455 | struct ip_tunnel *t = netdev_priv(dev); | |
1456 | struct ip_tunnel_parm *p = &t->parms; | |
feaf5c79 LB |
1457 | __be16 o_flags = p->o_flags; |
1458 | ||
2bdf700e LB |
1459 | if (t->erspan_ver == 1 || t->erspan_ver == 2) { |
1460 | if (!t->collect_md) | |
1461 | o_flags |= TUNNEL_KEY; | |
1462 | ||
1463 | if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver)) | |
1464 | goto nla_put_failure; | |
1465 | ||
1466 | if (t->erspan_ver == 1) { | |
1467 | if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) | |
1468 | goto nla_put_failure; | |
1469 | } else { | |
1470 | if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir)) | |
1471 | goto nla_put_failure; | |
1472 | if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid)) | |
1473 | goto nla_put_failure; | |
1474 | } | |
1475 | } | |
c19e654d | 1476 | |
f3756b79 | 1477 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
95f5c64c TH |
1478 | nla_put_be16(skb, IFLA_GRE_IFLAGS, |
1479 | gre_tnl_flags_to_gre_flags(p->i_flags)) || | |
1480 | nla_put_be16(skb, IFLA_GRE_OFLAGS, | |
feaf5c79 | 1481 | gre_tnl_flags_to_gre_flags(o_flags)) || |
f3756b79 DM |
1482 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1483 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1484 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
1485 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
f3756b79 DM |
1486 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
1487 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1488 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
9830ad4c CG |
1489 | !!(p->iph.frag_off & htons(IP_DF))) || |
1490 | nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark)) | |
f3756b79 | 1491 | goto nla_put_failure; |
4565e991 TH |
1492 | |
1493 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1494 | t->encap.type) || | |
3e97fa70 SD |
1495 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
1496 | t->encap.sport) || | |
1497 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1498 | t->encap.dport) || | |
4565e991 | 1499 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
e1b2cb65 | 1500 | t->encap.flags)) |
4565e991 TH |
1501 | goto nla_put_failure; |
1502 | ||
22a59be8 PP |
1503 | if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df)) |
1504 | goto nla_put_failure; | |
1505 | ||
2e15ea39 PS |
1506 | if (t->collect_md) { |
1507 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) | |
1508 | goto nla_put_failure; | |
1509 | } | |
1510 | ||
c19e654d HX |
1511 | return 0; |
1512 | ||
1513 | nla_put_failure: | |
1514 | return -EMSGSIZE; | |
1515 | } | |
1516 | ||
84e54fe0 WT |
1517 | static void erspan_setup(struct net_device *dev) |
1518 | { | |
84581bda XL |
1519 | struct ip_tunnel *t = netdev_priv(dev); |
1520 | ||
84e54fe0 | 1521 | ether_setup(dev); |
0e141f75 | 1522 | dev->max_mtu = 0; |
84e54fe0 WT |
1523 | dev->netdev_ops = &erspan_netdev_ops; |
1524 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1525 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
1526 | ip_tunnel_setup(dev, erspan_net_id); | |
84581bda | 1527 | t->erspan_ver = 1; |
84e54fe0 WT |
1528 | } |
1529 | ||
c19e654d HX |
1530 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
1531 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1532 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1533 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1534 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1535 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
c593642c PB |
1536 | [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, |
1537 | [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, | |
c19e654d HX |
1538 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1539 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1540 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
4565e991 TH |
1541 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1542 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1543 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1544 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2e15ea39 | 1545 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
22a59be8 | 1546 | [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, |
9830ad4c | 1547 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
84e54fe0 | 1548 | [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
f551c91d WT |
1549 | [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
1550 | [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, | |
1551 | [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, | |
c19e654d HX |
1552 | }; |
1553 | ||
1554 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1555 | .kind = "gre", | |
1556 | .maxtype = IFLA_GRE_MAX, | |
1557 | .policy = ipgre_policy, | |
1558 | .priv_size = sizeof(struct ip_tunnel), | |
1559 | .setup = ipgre_tunnel_setup, | |
1560 | .validate = ipgre_tunnel_validate, | |
1561 | .newlink = ipgre_newlink, | |
1562 | .changelink = ipgre_changelink, | |
c5441932 | 1563 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
1564 | .get_size = ipgre_get_size, |
1565 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1566 | .get_link_net = ip_tunnel_get_link_net, |
c19e654d HX |
1567 | }; |
1568 | ||
e1a80002 HX |
1569 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1570 | .kind = "gretap", | |
1571 | .maxtype = IFLA_GRE_MAX, | |
1572 | .policy = ipgre_policy, | |
1573 | .priv_size = sizeof(struct ip_tunnel), | |
1574 | .setup = ipgre_tap_setup, | |
1575 | .validate = ipgre_tap_validate, | |
1576 | .newlink = ipgre_newlink, | |
1577 | .changelink = ipgre_changelink, | |
c5441932 | 1578 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
1579 | .get_size = ipgre_get_size, |
1580 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1581 | .get_link_net = ip_tunnel_get_link_net, |
e1a80002 HX |
1582 | }; |
1583 | ||
84e54fe0 WT |
1584 | static struct rtnl_link_ops erspan_link_ops __read_mostly = { |
1585 | .kind = "erspan", | |
1586 | .maxtype = IFLA_GRE_MAX, | |
1587 | .policy = ipgre_policy, | |
1588 | .priv_size = sizeof(struct ip_tunnel), | |
1589 | .setup = erspan_setup, | |
1590 | .validate = erspan_validate, | |
e1f8f78f PM |
1591 | .newlink = erspan_newlink, |
1592 | .changelink = erspan_changelink, | |
84e54fe0 WT |
1593 | .dellink = ip_tunnel_dellink, |
1594 | .get_size = ipgre_get_size, | |
1595 | .fill_info = ipgre_fill_info, | |
1596 | .get_link_net = ip_tunnel_get_link_net, | |
1597 | }; | |
1598 | ||
b2acd1dc PS |
1599 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1600 | u8 name_assign_type) | |
1601 | { | |
1602 | struct nlattr *tb[IFLA_MAX + 1]; | |
1603 | struct net_device *dev; | |
106da663 | 1604 | LIST_HEAD(list_kill); |
b2acd1dc PS |
1605 | struct ip_tunnel *t; |
1606 | int err; | |
1607 | ||
1608 | memset(&tb, 0, sizeof(tb)); | |
1609 | ||
1610 | dev = rtnl_create_link(net, name, name_assign_type, | |
d0522f1c | 1611 | &ipgre_tap_ops, tb, NULL); |
b2acd1dc PS |
1612 | if (IS_ERR(dev)) |
1613 | return dev; | |
1614 | ||
1615 | /* Configure flow based GRE device. */ | |
1616 | t = netdev_priv(dev); | |
1617 | t->collect_md = true; | |
1618 | ||
7a3f4a18 | 1619 | err = ipgre_newlink(net, dev, tb, NULL, NULL); |
106da663 ND |
1620 | if (err < 0) { |
1621 | free_netdev(dev); | |
1622 | return ERR_PTR(err); | |
1623 | } | |
7e059158 DW |
1624 | |
1625 | /* openvswitch users expect packet sizes to be unrestricted, | |
1626 | * so set the largest MTU we can. | |
1627 | */ | |
1628 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); | |
1629 | if (err) | |
1630 | goto out; | |
1631 | ||
da6f1da8 ND |
1632 | err = rtnl_configure_link(dev, NULL); |
1633 | if (err < 0) | |
1634 | goto out; | |
1635 | ||
b2acd1dc PS |
1636 | return dev; |
1637 | out: | |
106da663 ND |
1638 | ip_tunnel_dellink(dev, &list_kill); |
1639 | unregister_netdevice_many(&list_kill); | |
b2acd1dc PS |
1640 | return ERR_PTR(err); |
1641 | } | |
1642 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); | |
1643 | ||
c5441932 PS |
1644 | static int __net_init ipgre_tap_init_net(struct net *net) |
1645 | { | |
2e15ea39 | 1646 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
c5441932 PS |
1647 | } |
1648 | ||
64bc1781 | 1649 | static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net) |
c5441932 | 1650 | { |
64bc1781 | 1651 | ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops); |
c5441932 PS |
1652 | } |
1653 | ||
1654 | static struct pernet_operations ipgre_tap_net_ops = { | |
1655 | .init = ipgre_tap_init_net, | |
64bc1781 | 1656 | .exit_batch = ipgre_tap_exit_batch_net, |
c5441932 PS |
1657 | .id = &gre_tap_net_id, |
1658 | .size = sizeof(struct ip_tunnel_net), | |
1659 | }; | |
1da177e4 | 1660 | |
84e54fe0 WT |
1661 | static int __net_init erspan_init_net(struct net *net) |
1662 | { | |
1663 | return ip_tunnel_init_net(net, erspan_net_id, | |
1664 | &erspan_link_ops, "erspan0"); | |
1665 | } | |
1666 | ||
64bc1781 | 1667 | static void __net_exit erspan_exit_batch_net(struct list_head *net_list) |
84e54fe0 | 1668 | { |
64bc1781 | 1669 | ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops); |
84e54fe0 WT |
1670 | } |
1671 | ||
1672 | static struct pernet_operations erspan_net_ops = { | |
1673 | .init = erspan_init_net, | |
64bc1781 | 1674 | .exit_batch = erspan_exit_batch_net, |
84e54fe0 WT |
1675 | .id = &erspan_net_id, |
1676 | .size = sizeof(struct ip_tunnel_net), | |
1677 | }; | |
1678 | ||
1da177e4 LT |
1679 | static int __init ipgre_init(void) |
1680 | { | |
1681 | int err; | |
1682 | ||
058bd4d2 | 1683 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1684 | |
cfb8fbf2 | 1685 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1686 | if (err < 0) |
c2892f02 AD |
1687 | return err; |
1688 | ||
c5441932 PS |
1689 | err = register_pernet_device(&ipgre_tap_net_ops); |
1690 | if (err < 0) | |
e3d0328c | 1691 | goto pnet_tap_failed; |
c5441932 | 1692 | |
84e54fe0 WT |
1693 | err = register_pernet_device(&erspan_net_ops); |
1694 | if (err < 0) | |
1695 | goto pnet_erspan_failed; | |
1696 | ||
9f57c67c | 1697 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1698 | if (err < 0) { |
058bd4d2 | 1699 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1700 | goto add_proto_failed; |
1701 | } | |
7daa0004 | 1702 | |
c19e654d HX |
1703 | err = rtnl_link_register(&ipgre_link_ops); |
1704 | if (err < 0) | |
1705 | goto rtnl_link_failed; | |
1706 | ||
e1a80002 HX |
1707 | err = rtnl_link_register(&ipgre_tap_ops); |
1708 | if (err < 0) | |
1709 | goto tap_ops_failed; | |
1710 | ||
84e54fe0 WT |
1711 | err = rtnl_link_register(&erspan_link_ops); |
1712 | if (err < 0) | |
1713 | goto erspan_link_failed; | |
1714 | ||
c5441932 | 1715 | return 0; |
c19e654d | 1716 | |
84e54fe0 WT |
1717 | erspan_link_failed: |
1718 | rtnl_link_unregister(&ipgre_tap_ops); | |
e1a80002 HX |
1719 | tap_ops_failed: |
1720 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1721 | rtnl_link_failed: |
9f57c67c | 1722 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1723 | add_proto_failed: |
84e54fe0 WT |
1724 | unregister_pernet_device(&erspan_net_ops); |
1725 | pnet_erspan_failed: | |
c5441932 | 1726 | unregister_pernet_device(&ipgre_tap_net_ops); |
e3d0328c | 1727 | pnet_tap_failed: |
c2892f02 | 1728 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1729 | return err; |
1da177e4 LT |
1730 | } |
1731 | ||
db44575f | 1732 | static void __exit ipgre_fini(void) |
1da177e4 | 1733 | { |
e1a80002 | 1734 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1735 | rtnl_link_unregister(&ipgre_link_ops); |
84e54fe0 | 1736 | rtnl_link_unregister(&erspan_link_ops); |
9f57c67c | 1737 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c5441932 | 1738 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1739 | unregister_pernet_device(&ipgre_net_ops); |
84e54fe0 | 1740 | unregister_pernet_device(&erspan_net_ops); |
1da177e4 LT |
1741 | } |
1742 | ||
1743 | module_init(ipgre_init); | |
1744 | module_exit(ipgre_fini); | |
1745 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1746 | MODULE_ALIAS_RTNL_LINK("gre"); |
1747 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
84e54fe0 | 1748 | MODULE_ALIAS_RTNL_LINK("erspan"); |
8909c9ad | 1749 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1750 | MODULE_ALIAS_NETDEV("gretap0"); |
84e54fe0 | 1751 | MODULE_ALIAS_NETDEV("erspan0"); |