Commit | Line | Data |
---|---|---|
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 | ||
f989d546 WT |
251 | static bool is_erspan_type1(int gre_hdr_len) |
252 | { | |
253 | /* Both ERSPAN type I (version 0) and type II (version 1) use | |
254 | * protocol 0x88BE, but the type I has only 4-byte GRE header, | |
255 | * while type II has 8-byte. | |
256 | */ | |
257 | return gre_hdr_len == 4; | |
258 | } | |
259 | ||
84e54fe0 WT |
260 | static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
261 | int gre_hdr_len) | |
262 | { | |
263 | struct net *net = dev_net(skb->dev); | |
264 | struct metadata_dst *tun_dst = NULL; | |
1d7e2ed2 | 265 | struct erspan_base_hdr *ershdr; |
84e54fe0 WT |
266 | struct ip_tunnel_net *itn; |
267 | struct ip_tunnel *tunnel; | |
84e54fe0 | 268 | const struct iphdr *iph; |
3df19283 | 269 | struct erspan_md2 *md2; |
1d7e2ed2 | 270 | int ver; |
84e54fe0 WT |
271 | int len; |
272 | ||
273 | itn = net_generic(net, erspan_net_id); | |
84e54fe0 | 274 | iph = ip_hdr(skb); |
f989d546 WT |
275 | if (is_erspan_type1(gre_hdr_len)) { |
276 | ver = 0; | |
277 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, | |
278 | tpi->flags | TUNNEL_NO_KEY, | |
279 | iph->saddr, iph->daddr, 0); | |
280 | } else { | |
281 | ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len); | |
282 | ver = ershdr->ver; | |
283 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, | |
284 | tpi->flags | TUNNEL_KEY, | |
285 | iph->saddr, iph->daddr, tpi->key); | |
286 | } | |
84e54fe0 WT |
287 | |
288 | if (tunnel) { | |
f989d546 WT |
289 | if (is_erspan_type1(gre_hdr_len)) |
290 | len = gre_hdr_len; | |
291 | else | |
292 | len = gre_hdr_len + erspan_hdr_len(ver); | |
293 | ||
1d7e2ed2 | 294 | if (unlikely(!pskb_may_pull(skb, len))) |
ae3e1337 | 295 | return PACKET_REJECT; |
1d7e2ed2 | 296 | |
84e54fe0 | 297 | if (__iptunnel_pull_header(skb, |
1d7e2ed2 | 298 | len, |
84e54fe0 WT |
299 | htons(ETH_P_TEB), |
300 | false, false) < 0) | |
301 | goto drop; | |
302 | ||
1a66a836 | 303 | if (tunnel->collect_md) { |
492b67e2 | 304 | struct erspan_metadata *pkt_md, *md; |
1a66a836 | 305 | struct ip_tunnel_info *info; |
492b67e2 | 306 | unsigned char *gh; |
1a66a836 WT |
307 | __be64 tun_id; |
308 | __be16 flags; | |
309 | ||
310 | tpi->flags |= TUNNEL_KEY; | |
311 | flags = tpi->flags; | |
312 | tun_id = key32_to_tunnel_id(tpi->key); | |
313 | ||
314 | tun_dst = ip_tun_rx_dst(skb, flags, | |
315 | tun_id, sizeof(*md)); | |
316 | if (!tun_dst) | |
317 | return PACKET_REJECT; | |
318 | ||
492b67e2 LB |
319 | /* skb can be uncloned in __iptunnel_pull_header, so |
320 | * old pkt_md is no longer valid and we need to reset | |
321 | * it | |
322 | */ | |
323 | gh = skb_network_header(skb) + | |
324 | skb_network_header_len(skb); | |
325 | pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + | |
326 | sizeof(*ershdr)); | |
1a66a836 | 327 | md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
f551c91d | 328 | md->version = ver; |
3df19283 WT |
329 | md2 = &md->u.md2; |
330 | memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : | |
331 | ERSPAN_V2_MDSIZE); | |
f551c91d | 332 | |
1a66a836 WT |
333 | info = &tun_dst->u.tun_info; |
334 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; | |
335 | info->options_len = sizeof(*md); | |
1a66a836 WT |
336 | } |
337 | ||
84e54fe0 WT |
338 | skb_reset_mac_header(skb); |
339 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
340 | return PACKET_RCVD; | |
341 | } | |
5a64506b HY |
342 | return PACKET_REJECT; |
343 | ||
84e54fe0 WT |
344 | drop: |
345 | kfree_skb(skb); | |
346 | return PACKET_RCVD; | |
347 | } | |
348 | ||
125372fa JB |
349 | static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
350 | struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) | |
1da177e4 | 351 | { |
2e15ea39 | 352 | struct metadata_dst *tun_dst = NULL; |
b71d1d42 | 353 | const struct iphdr *iph; |
1da177e4 | 354 | struct ip_tunnel *tunnel; |
1da177e4 | 355 | |
c5441932 | 356 | iph = ip_hdr(skb); |
bda7bb46 PS |
357 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
358 | iph->saddr, iph->daddr, tpi->key); | |
e1a80002 | 359 | |
d2083287 | 360 | if (tunnel) { |
c0d59da7 | 361 | const struct iphdr *tnl_params; |
362 | ||
125372fa JB |
363 | if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, |
364 | raw_proto, false) < 0) | |
244a797b JB |
365 | goto drop; |
366 | ||
e271c7b4 JB |
367 | if (tunnel->dev->type != ARPHRD_NONE) |
368 | skb_pop_mac_header(skb); | |
369 | else | |
370 | skb_reset_mac_header(skb); | |
c0d59da7 | 371 | |
372 | tnl_params = &tunnel->parms.iph; | |
373 | if (tunnel->collect_md || tnl_params->daddr == 0) { | |
c29a70d2 PS |
374 | __be16 flags; |
375 | __be64 tun_id; | |
2e15ea39 | 376 | |
c29a70d2 | 377 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
d817f432 | 378 | tun_id = key32_to_tunnel_id(tpi->key); |
c29a70d2 | 379 | tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); |
2e15ea39 PS |
380 | if (!tun_dst) |
381 | return PACKET_REJECT; | |
2e15ea39 PS |
382 | } |
383 | ||
384 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
bda7bb46 | 385 | return PACKET_RCVD; |
1da177e4 | 386 | } |
125372fa | 387 | return PACKET_NEXT; |
244a797b JB |
388 | |
389 | drop: | |
390 | kfree_skb(skb); | |
391 | return PACKET_RCVD; | |
1da177e4 LT |
392 | } |
393 | ||
125372fa JB |
394 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
395 | int hdr_len) | |
396 | { | |
397 | struct net *net = dev_net(skb->dev); | |
398 | struct ip_tunnel_net *itn; | |
399 | int res; | |
400 | ||
401 | if (tpi->proto == htons(ETH_P_TEB)) | |
402 | itn = net_generic(net, gre_tap_net_id); | |
403 | else | |
404 | itn = net_generic(net, ipgre_net_id); | |
405 | ||
406 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); | |
407 | if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { | |
408 | /* ipgre tunnels in collect metadata mode should receive | |
409 | * also ETH_P_TEB traffic. | |
410 | */ | |
411 | itn = net_generic(net, ipgre_net_id); | |
412 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); | |
413 | } | |
414 | return res; | |
415 | } | |
416 | ||
9f57c67c PS |
417 | static int gre_rcv(struct sk_buff *skb) |
418 | { | |
419 | struct tnl_ptk_info tpi; | |
420 | bool csum_err = false; | |
95f5c64c | 421 | int hdr_len; |
9f57c67c PS |
422 | |
423 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
424 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { | |
425 | /* Looped back packet, drop it! */ | |
426 | if (rt_is_output_route(skb_rtable(skb))) | |
427 | goto drop; | |
428 | } | |
429 | #endif | |
430 | ||
e582615a | 431 | hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); |
f132ae7c | 432 | if (hdr_len < 0) |
95f5c64c TH |
433 | goto drop; |
434 | ||
f551c91d WT |
435 | if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
436 | tpi.proto == htons(ETH_P_ERSPAN2))) { | |
84e54fe0 WT |
437 | if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
438 | return 0; | |
dd8d5b8c | 439 | goto out; |
84e54fe0 WT |
440 | } |
441 | ||
244a797b | 442 | if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
9f57c67c PS |
443 | return 0; |
444 | ||
dd8d5b8c | 445 | out: |
9f57c67c PS |
446 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
447 | drop: | |
448 | kfree_skb(skb); | |
449 | return 0; | |
450 | } | |
451 | ||
c5441932 PS |
452 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
453 | const struct iphdr *tnl_params, | |
454 | __be16 proto) | |
455 | { | |
456 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1da177e4 | 457 | |
c5441932 PS |
458 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
459 | tunnel->o_seqno++; | |
1da177e4 | 460 | |
c5441932 | 461 | /* Push GRE header. */ |
182a352d TH |
462 | gre_build_header(skb, tunnel->tun_hlen, |
463 | tunnel->parms.o_flags, proto, tunnel->parms.o_key, | |
464 | htonl(tunnel->o_seqno)); | |
54bc9bac | 465 | |
bf3d6a8f | 466 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
c5441932 | 467 | } |
1da177e4 | 468 | |
aed069df | 469 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
b2acd1dc | 470 | { |
6fa79666 | 471 | return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
b2acd1dc PS |
472 | } |
473 | ||
862a03c3 WT |
474 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
475 | __be16 proto) | |
476 | { | |
77a5196a | 477 | struct ip_tunnel *tunnel = netdev_priv(dev); |
862a03c3 WT |
478 | struct ip_tunnel_info *tun_info; |
479 | const struct ip_tunnel_key *key; | |
862a03c3 | 480 | int tunnel_hlen; |
962924fa | 481 | __be16 flags; |
862a03c3 WT |
482 | |
483 | tun_info = skb_tunnel_info(skb); | |
484 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
485 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
486 | goto err_free_skb; | |
487 | ||
488 | key = &tun_info->key; | |
489 | tunnel_hlen = gre_calc_hlen(key->tun_flags); | |
490 | ||
962924fa | 491 | if (skb_cow_head(skb, dev->needed_headroom)) |
492 | goto err_free_skb; | |
2e15ea39 PS |
493 | |
494 | /* Push Tunnel header. */ | |
aed069df | 495 | if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
962924fa | 496 | goto err_free_skb; |
2e15ea39 | 497 | |
77a5196a WT |
498 | flags = tun_info->key.tun_flags & |
499 | (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); | |
cba65321 | 500 | gre_build_header(skb, tunnel_hlen, flags, proto, |
77a5196a | 501 | tunnel_id_to_key32(tun_info->key.tun_id), |
15746394 | 502 | (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0); |
2e15ea39 | 503 | |
962924fa | 504 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
039f5062 | 505 | |
2e15ea39 PS |
506 | return; |
507 | ||
2e15ea39 PS |
508 | err_free_skb: |
509 | kfree_skb(skb); | |
510 | dev->stats.tx_dropped++; | |
511 | } | |
512 | ||
20704bd1 | 513 | static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev) |
1a66a836 WT |
514 | { |
515 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
516 | struct ip_tunnel_info *tun_info; | |
517 | const struct ip_tunnel_key *key; | |
518 | struct erspan_metadata *md; | |
1a66a836 | 519 | bool truncate = false; |
962924fa | 520 | __be16 proto; |
1a66a836 | 521 | int tunnel_hlen; |
f551c91d | 522 | int version; |
1baf5ebf | 523 | int nhoff; |
d5db21a3 | 524 | int thoff; |
1a66a836 WT |
525 | |
526 | tun_info = skb_tunnel_info(skb); | |
527 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
528 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
529 | goto err_free_skb; | |
530 | ||
531 | key = &tun_info->key; | |
256c87c1 | 532 | if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
962924fa | 533 | goto err_free_skb; |
2eb8d6d2 | 534 | if (tun_info->options_len < sizeof(*md)) |
962924fa | 535 | goto err_free_skb; |
2eb8d6d2 | 536 | md = ip_tunnel_info_opts(tun_info); |
1a66a836 WT |
537 | |
538 | /* ERSPAN has fixed 8 byte GRE header */ | |
f551c91d WT |
539 | version = md->version; |
540 | tunnel_hlen = 8 + erspan_hdr_len(version); | |
1a66a836 | 541 | |
962924fa | 542 | if (skb_cow_head(skb, dev->needed_headroom)) |
543 | goto err_free_skb; | |
1a66a836 WT |
544 | |
545 | if (gre_handle_offloads(skb, false)) | |
962924fa | 546 | goto err_free_skb; |
1a66a836 | 547 | |
f192970d WT |
548 | if (skb->len > dev->mtu + dev->hard_header_len) { |
549 | pskb_trim(skb, dev->mtu + dev->hard_header_len); | |
1a66a836 WT |
550 | truncate = true; |
551 | } | |
552 | ||
1baf5ebf WT |
553 | nhoff = skb_network_header(skb) - skb_mac_header(skb); |
554 | if (skb->protocol == htons(ETH_P_IP) && | |
555 | (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) | |
556 | truncate = true; | |
d5db21a3 WT |
557 | |
558 | thoff = skb_transport_header(skb) - skb_mac_header(skb); | |
559 | if (skb->protocol == htons(ETH_P_IPV6) && | |
560 | (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) | |
561 | truncate = true; | |
1baf5ebf | 562 | |
f551c91d | 563 | if (version == 1) { |
c69de58b | 564 | erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)), |
f551c91d | 565 | ntohl(md->u.index), truncate, true); |
20704bd1 | 566 | proto = htons(ETH_P_ERSPAN); |
f551c91d | 567 | } else if (version == 2) { |
c69de58b WT |
568 | erspan_build_header_v2(skb, |
569 | ntohl(tunnel_id_to_key32(key->tun_id)), | |
570 | md->u.md2.dir, | |
571 | get_hwid(&md->u.md2), | |
572 | truncate, true); | |
20704bd1 | 573 | proto = htons(ETH_P_ERSPAN2); |
f551c91d | 574 | } else { |
962924fa | 575 | goto err_free_skb; |
f551c91d | 576 | } |
1a66a836 WT |
577 | |
578 | gre_build_header(skb, 8, TUNNEL_SEQ, | |
20704bd1 | 579 | proto, 0, htonl(tunnel->o_seqno++)); |
1a66a836 | 580 | |
962924fa | 581 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
1a66a836 | 582 | |
1a66a836 WT |
583 | return; |
584 | ||
1a66a836 WT |
585 | err_free_skb: |
586 | kfree_skb(skb); | |
587 | dev->stats.tx_dropped++; | |
588 | } | |
589 | ||
fc4099f1 PS |
590 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
591 | { | |
592 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
962924fa | 593 | const struct ip_tunnel_key *key; |
fc4099f1 PS |
594 | struct rtable *rt; |
595 | struct flowi4 fl4; | |
596 | ||
597 | if (ip_tunnel_info_af(info) != AF_INET) | |
598 | return -EINVAL; | |
599 | ||
962924fa | 600 | key = &info->key; |
601 | ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src, | |
602 | tunnel_id_to_key32(key->tun_id), key->tos, 0, | |
24ba1440 | 603 | skb->mark, skb_get_hash(skb)); |
962924fa | 604 | rt = ip_route_output_key(dev_net(dev), &fl4); |
fc4099f1 PS |
605 | if (IS_ERR(rt)) |
606 | return PTR_ERR(rt); | |
607 | ||
608 | ip_rt_put(rt); | |
609 | info->key.u.ipv4.src = fl4.saddr; | |
610 | return 0; | |
611 | } | |
612 | ||
c5441932 PS |
613 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
614 | struct net_device *dev) | |
615 | { | |
616 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
617 | const struct iphdr *tnl_params; | |
1da177e4 | 618 | |
cb9f1b78 WB |
619 | if (!pskb_inet_may_pull(skb)) |
620 | goto free_skb; | |
621 | ||
2e15ea39 | 622 | if (tunnel->collect_md) { |
2090714e | 623 | gre_fb_xmit(skb, dev, skb->protocol); |
2e15ea39 PS |
624 | return NETDEV_TX_OK; |
625 | } | |
626 | ||
c5441932 | 627 | if (dev->header_ops) { |
fdafed45 | 628 | if (skb_cow_head(skb, 0)) |
c5441932 | 629 | goto free_skb; |
1da177e4 | 630 | |
c5441932 | 631 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 632 | |
c5441932 PS |
633 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
634 | * to gre header. | |
635 | */ | |
636 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); | |
8a0033a9 | 637 | skb_reset_mac_header(skb); |
c5441932 PS |
638 | } else { |
639 | if (skb_cow_head(skb, dev->needed_headroom)) | |
640 | goto free_skb; | |
1da177e4 | 641 | |
c5441932 | 642 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
643 | } |
644 | ||
aed069df AD |
645 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
646 | goto free_skb; | |
8a0033a9 | 647 | |
c5441932 | 648 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
6ed10654 | 649 | return NETDEV_TX_OK; |
1da177e4 | 650 | |
c5441932 | 651 | free_skb: |
3acfa1e7 | 652 | kfree_skb(skb); |
c5441932 | 653 | dev->stats.tx_dropped++; |
6ed10654 | 654 | return NETDEV_TX_OK; |
1da177e4 LT |
655 | } |
656 | ||
84e54fe0 WT |
657 | static netdev_tx_t erspan_xmit(struct sk_buff *skb, |
658 | struct net_device *dev) | |
659 | { | |
660 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
661 | bool truncate = false; | |
20704bd1 | 662 | __be16 proto; |
84e54fe0 | 663 | |
cb9f1b78 WB |
664 | if (!pskb_inet_may_pull(skb)) |
665 | goto free_skb; | |
666 | ||
1a66a836 | 667 | if (tunnel->collect_md) { |
20704bd1 | 668 | erspan_fb_xmit(skb, dev); |
1a66a836 WT |
669 | return NETDEV_TX_OK; |
670 | } | |
671 | ||
84e54fe0 WT |
672 | if (gre_handle_offloads(skb, false)) |
673 | goto free_skb; | |
674 | ||
675 | if (skb_cow_head(skb, dev->needed_headroom)) | |
676 | goto free_skb; | |
677 | ||
f192970d WT |
678 | if (skb->len > dev->mtu + dev->hard_header_len) { |
679 | pskb_trim(skb, dev->mtu + dev->hard_header_len); | |
84e54fe0 WT |
680 | truncate = true; |
681 | } | |
682 | ||
683 | /* Push ERSPAN header */ | |
f989d546 WT |
684 | if (tunnel->erspan_ver == 0) { |
685 | proto = htons(ETH_P_ERSPAN); | |
686 | tunnel->parms.o_flags &= ~TUNNEL_SEQ; | |
687 | } else if (tunnel->erspan_ver == 1) { | |
c69de58b WT |
688 | erspan_build_header(skb, ntohl(tunnel->parms.o_key), |
689 | tunnel->index, | |
f551c91d | 690 | truncate, true); |
20704bd1 XL |
691 | proto = htons(ETH_P_ERSPAN); |
692 | } else if (tunnel->erspan_ver == 2) { | |
c69de58b | 693 | erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key), |
f551c91d WT |
694 | tunnel->dir, tunnel->hwid, |
695 | truncate, true); | |
20704bd1 XL |
696 | proto = htons(ETH_P_ERSPAN2); |
697 | } else { | |
02f99df1 | 698 | goto free_skb; |
20704bd1 | 699 | } |
f551c91d | 700 | |
84e54fe0 | 701 | tunnel->parms.o_flags &= ~TUNNEL_KEY; |
20704bd1 | 702 | __gre_xmit(skb, dev, &tunnel->parms.iph, proto); |
84e54fe0 WT |
703 | return NETDEV_TX_OK; |
704 | ||
705 | free_skb: | |
706 | kfree_skb(skb); | |
707 | dev->stats.tx_dropped++; | |
708 | return NETDEV_TX_OK; | |
709 | } | |
710 | ||
c5441932 PS |
711 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
712 | struct net_device *dev) | |
ee34c1eb | 713 | { |
c5441932 | 714 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 715 | |
cb9f1b78 WB |
716 | if (!pskb_inet_may_pull(skb)) |
717 | goto free_skb; | |
718 | ||
2e15ea39 | 719 | if (tunnel->collect_md) { |
2090714e | 720 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
2e15ea39 PS |
721 | return NETDEV_TX_OK; |
722 | } | |
723 | ||
aed069df AD |
724 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
725 | goto free_skb; | |
ee34c1eb | 726 | |
c5441932 PS |
727 | if (skb_cow_head(skb, dev->needed_headroom)) |
728 | goto free_skb; | |
42aa9162 | 729 | |
c5441932 | 730 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
c5441932 | 731 | return NETDEV_TX_OK; |
ee34c1eb | 732 | |
c5441932 | 733 | free_skb: |
3acfa1e7 | 734 | kfree_skb(skb); |
c5441932 PS |
735 | dev->stats.tx_dropped++; |
736 | return NETDEV_TX_OK; | |
ee34c1eb MS |
737 | } |
738 | ||
dd9d598c XL |
739 | static void ipgre_link_update(struct net_device *dev, bool set_mtu) |
740 | { | |
741 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
742 | int len; | |
743 | ||
744 | len = tunnel->tun_hlen; | |
745 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); | |
746 | len = tunnel->tun_hlen - len; | |
747 | tunnel->hlen = tunnel->hlen + len; | |
748 | ||
fdafed45 CW |
749 | if (dev->header_ops) |
750 | dev->hard_header_len += len; | |
751 | else | |
752 | dev->needed_headroom += len; | |
753 | ||
dd9d598c XL |
754 | if (set_mtu) |
755 | dev->mtu = max_t(int, dev->mtu - len, 68); | |
756 | ||
757 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
758 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
759 | tunnel->encap.type == TUNNEL_ENCAP_NONE) { | |
760 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
761 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1cc5954f SD |
762 | } else { |
763 | dev->features &= ~NETIF_F_GSO_SOFTWARE; | |
764 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
dd9d598c XL |
765 | } |
766 | dev->features |= NETIF_F_LLTX; | |
1cc5954f SD |
767 | } else { |
768 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
769 | dev->features &= ~(NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE); | |
dd9d598c XL |
770 | } |
771 | } | |
772 | ||
607259a6 CH |
773 | static int ipgre_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, |
774 | int cmd) | |
1da177e4 | 775 | { |
a0efab67 | 776 | int err; |
1da177e4 | 777 | |
6c734fb8 | 778 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
607259a6 CH |
779 | if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE || |
780 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) || | |
781 | ((p->i_flags | p->o_flags) & (GRE_VERSION | GRE_ROUTING))) | |
6c734fb8 | 782 | return -EINVAL; |
1da177e4 | 783 | } |
a0efab67 | 784 | |
607259a6 CH |
785 | p->i_flags = gre_flags_to_tnl_flags(p->i_flags); |
786 | p->o_flags = gre_flags_to_tnl_flags(p->o_flags); | |
1da177e4 | 787 | |
607259a6 | 788 | err = ip_tunnel_ctl(dev, p, cmd); |
c5441932 PS |
789 | if (err) |
790 | return err; | |
1da177e4 | 791 | |
a0efab67 XL |
792 | if (cmd == SIOCCHGTUNNEL) { |
793 | struct ip_tunnel *t = netdev_priv(dev); | |
794 | ||
607259a6 CH |
795 | t->parms.i_flags = p->i_flags; |
796 | t->parms.o_flags = p->o_flags; | |
a0efab67 XL |
797 | |
798 | if (strcmp(dev->rtnl_link_ops->kind, "erspan")) | |
799 | ipgre_link_update(dev, true); | |
800 | } | |
801 | ||
607259a6 CH |
802 | p->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); |
803 | p->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); | |
1da177e4 LT |
804 | return 0; |
805 | } | |
806 | ||
1da177e4 LT |
807 | /* Nice toy. Unfortunately, useless in real life :-) |
808 | It allows to construct virtual multiprotocol broadcast "LAN" | |
809 | over the Internet, provided multicast routing is tuned. | |
810 | ||
811 | ||
812 | I have no idea was this bicycle invented before me, | |
813 | so that I had to set ARPHRD_IPGRE to a random value. | |
814 | I have an impression, that Cisco could make something similar, | |
815 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 816 | |
1da177e4 LT |
817 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
818 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
819 | ||
820 | ping -t 255 224.66.66.66 | |
821 | ||
822 | If nobody answers, mbone does not work. | |
823 | ||
824 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
825 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
826 | ifconfig Universe up | |
827 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
828 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
829 | ftp 10.66.66.66 | |
830 | ... | |
831 | ftp fec0:6666:6666::193.233.7.65 | |
832 | ... | |
1da177e4 | 833 | */ |
3b04ddde SH |
834 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
835 | unsigned short type, | |
1507850b | 836 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 837 | { |
2941a486 | 838 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
839 | struct iphdr *iph; |
840 | struct gre_base_hdr *greh; | |
1da177e4 | 841 | |
d58ff351 | 842 | iph = skb_push(skb, t->hlen + sizeof(*iph)); |
c5441932 | 843 | greh = (struct gre_base_hdr *)(iph+1); |
95f5c64c | 844 | greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); |
c5441932 | 845 | greh->protocol = htons(type); |
1da177e4 | 846 | |
c5441932 | 847 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 848 | |
c5441932 | 849 | /* Set the source hardware address. */ |
1da177e4 LT |
850 | if (saddr) |
851 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 852 | if (daddr) |
1da177e4 | 853 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 854 | if (iph->daddr) |
77a482bd | 855 | return t->hlen + sizeof(*iph); |
e905a9ed | 856 | |
c5441932 | 857 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
858 | } |
859 | ||
6a5f44d7 TT |
860 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
861 | { | |
b71d1d42 | 862 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
863 | memcpy(haddr, &iph->saddr, 4); |
864 | return 4; | |
865 | } | |
866 | ||
3b04ddde SH |
867 | static const struct header_ops ipgre_header_ops = { |
868 | .create = ipgre_header, | |
6a5f44d7 | 869 | .parse = ipgre_header_parse, |
3b04ddde SH |
870 | }; |
871 | ||
6a5f44d7 | 872 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
873 | static int ipgre_open(struct net_device *dev) |
874 | { | |
2941a486 | 875 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 876 | |
f97c1e0c | 877 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
878 | struct flowi4 fl4; |
879 | struct rtable *rt; | |
880 | ||
b57708ad | 881 | rt = ip_route_output_gre(t->net, &fl4, |
cbb1e85f DM |
882 | t->parms.iph.daddr, |
883 | t->parms.iph.saddr, | |
884 | t->parms.o_key, | |
885 | RT_TOS(t->parms.iph.tos), | |
886 | t->parms.link); | |
b23dd4fe | 887 | if (IS_ERR(rt)) |
1da177e4 | 888 | return -EADDRNOTAVAIL; |
d8d1f30b | 889 | dev = rt->dst.dev; |
1da177e4 | 890 | ip_rt_put(rt); |
51456b29 | 891 | if (!__in_dev_get_rtnl(dev)) |
1da177e4 LT |
892 | return -EADDRNOTAVAIL; |
893 | t->mlink = dev->ifindex; | |
e5ed6399 | 894 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
895 | } |
896 | return 0; | |
897 | } | |
898 | ||
899 | static int ipgre_close(struct net_device *dev) | |
900 | { | |
2941a486 | 901 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 902 | |
f97c1e0c | 903 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 904 | struct in_device *in_dev; |
b57708ad | 905 | in_dev = inetdev_by_index(t->net, t->mlink); |
8723e1b4 | 906 | if (in_dev) |
1da177e4 | 907 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
908 | } |
909 | return 0; | |
910 | } | |
1da177e4 LT |
911 | #endif |
912 | ||
b8c26a33 SH |
913 | static const struct net_device_ops ipgre_netdev_ops = { |
914 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 915 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
916 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
917 | .ndo_open = ipgre_open, | |
918 | .ndo_stop = ipgre_close, | |
919 | #endif | |
c5441932 | 920 | .ndo_start_xmit = ipgre_xmit, |
607259a6 | 921 | .ndo_do_ioctl = ip_tunnel_ioctl, |
c5441932 | 922 | .ndo_change_mtu = ip_tunnel_change_mtu, |
98d7fc46 | 923 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 924 | .ndo_get_iflink = ip_tunnel_get_iflink, |
607259a6 | 925 | .ndo_tunnel_ctl = ipgre_tunnel_ctl, |
b8c26a33 SH |
926 | }; |
927 | ||
6b78f16e ED |
928 | #define GRE_FEATURES (NETIF_F_SG | \ |
929 | NETIF_F_FRAGLIST | \ | |
930 | NETIF_F_HIGHDMA | \ | |
931 | NETIF_F_HW_CSUM) | |
932 | ||
1da177e4 LT |
933 | static void ipgre_tunnel_setup(struct net_device *dev) |
934 | { | |
b8c26a33 | 935 | dev->netdev_ops = &ipgre_netdev_ops; |
5a455275 | 936 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
937 | ip_tunnel_setup(dev, ipgre_net_id); |
938 | } | |
1da177e4 | 939 | |
c5441932 PS |
940 | static void __gre_tunnel_init(struct net_device *dev) |
941 | { | |
942 | struct ip_tunnel *tunnel; | |
943 | ||
944 | tunnel = netdev_priv(dev); | |
95f5c64c | 945 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
c5441932 PS |
946 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
947 | ||
4565e991 | 948 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
fdafed45 | 949 | dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph); |
4565e991 | 950 | |
b57708ad | 951 | dev->features |= GRE_FEATURES; |
6b78f16e | 952 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
953 | |
954 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
a0ca153f AD |
955 | /* TCP offload with GRE SEQ is not supported, nor |
956 | * can we support 2 levels of outer headers requiring | |
957 | * an update. | |
958 | */ | |
959 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
960 | (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { | |
961 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
962 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
963 | } | |
964 | ||
c5441932 PS |
965 | /* Can use a lockless transmit, unless we generate |
966 | * output sequences | |
967 | */ | |
968 | dev->features |= NETIF_F_LLTX; | |
969 | } | |
1da177e4 LT |
970 | } |
971 | ||
972 | static int ipgre_tunnel_init(struct net_device *dev) | |
973 | { | |
c5441932 PS |
974 | struct ip_tunnel *tunnel = netdev_priv(dev); |
975 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 976 | |
c5441932 | 977 | __gre_tunnel_init(dev); |
1da177e4 | 978 | |
c5441932 PS |
979 | memcpy(dev->dev_addr, &iph->saddr, 4); |
980 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 981 | |
c5441932 | 982 | dev->flags = IFF_NOARP; |
02875878 | 983 | netif_keep_dst(dev); |
c5441932 | 984 | dev->addr_len = 4; |
1da177e4 | 985 | |
a64b04d8 | 986 | if (iph->daddr && !tunnel->collect_md) { |
1da177e4 | 987 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 988 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
989 | if (!iph->saddr) |
990 | return -EINVAL; | |
991 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 992 | dev->header_ops = &ipgre_header_ops; |
fdafed45 CW |
993 | dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
994 | dev->needed_headroom = 0; | |
1da177e4 LT |
995 | } |
996 | #endif | |
a64b04d8 | 997 | } else if (!tunnel->collect_md) { |
6a5f44d7 | 998 | dev->header_ops = &ipgre_header_ops; |
fdafed45 CW |
999 | dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
1000 | dev->needed_headroom = 0; | |
a64b04d8 | 1001 | } |
1da177e4 | 1002 | |
c5441932 | 1003 | return ip_tunnel_init(dev); |
1da177e4 LT |
1004 | } |
1005 | ||
9f57c67c PS |
1006 | static const struct gre_protocol ipgre_protocol = { |
1007 | .handler = gre_rcv, | |
1008 | .err_handler = gre_err, | |
1da177e4 LT |
1009 | }; |
1010 | ||
2c8c1e72 | 1011 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1012 | { |
c5441932 | 1013 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
1014 | } |
1015 | ||
64bc1781 | 1016 | static void __net_exit ipgre_exit_batch_net(struct list_head *list_net) |
59a4c759 | 1017 | { |
64bc1781 | 1018 | ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops); |
59a4c759 PE |
1019 | } |
1020 | ||
1021 | static struct pernet_operations ipgre_net_ops = { | |
1022 | .init = ipgre_init_net, | |
64bc1781 | 1023 | .exit_batch = ipgre_exit_batch_net, |
cfb8fbf2 | 1024 | .id = &ipgre_net_id, |
c5441932 | 1025 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 1026 | }; |
1da177e4 | 1027 | |
a8b8a889 MS |
1028 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
1029 | struct netlink_ext_ack *extack) | |
c19e654d HX |
1030 | { |
1031 | __be16 flags; | |
1032 | ||
1033 | if (!data) | |
1034 | return 0; | |
1035 | ||
1036 | flags = 0; | |
1037 | if (data[IFLA_GRE_IFLAGS]) | |
1038 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1039 | if (data[IFLA_GRE_OFLAGS]) | |
1040 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1041 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1042 | return -EINVAL; | |
1043 | ||
946b636f JB |
1044 | if (data[IFLA_GRE_COLLECT_METADATA] && |
1045 | data[IFLA_GRE_ENCAP_TYPE] && | |
1046 | nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) | |
1047 | return -EINVAL; | |
1048 | ||
c19e654d HX |
1049 | return 0; |
1050 | } | |
1051 | ||
a8b8a889 MS |
1052 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1053 | struct netlink_ext_ack *extack) | |
e1a80002 HX |
1054 | { |
1055 | __be32 daddr; | |
1056 | ||
1057 | if (tb[IFLA_ADDRESS]) { | |
1058 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1059 | return -EINVAL; | |
1060 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1061 | return -EADDRNOTAVAIL; | |
1062 | } | |
1063 | ||
1064 | if (!data) | |
1065 | goto out; | |
1066 | ||
1067 | if (data[IFLA_GRE_REMOTE]) { | |
1068 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1069 | if (!daddr) | |
1070 | return -EINVAL; | |
1071 | } | |
1072 | ||
1073 | out: | |
a8b8a889 | 1074 | return ipgre_tunnel_validate(tb, data, extack); |
e1a80002 HX |
1075 | } |
1076 | ||
84e54fe0 WT |
1077 | static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], |
1078 | struct netlink_ext_ack *extack) | |
1079 | { | |
1080 | __be16 flags = 0; | |
1081 | int ret; | |
1082 | ||
1083 | if (!data) | |
1084 | return 0; | |
1085 | ||
1086 | ret = ipgre_tap_validate(tb, data, extack); | |
1087 | if (ret) | |
1088 | return ret; | |
1089 | ||
51fa960d WT |
1090 | if (data[IFLA_GRE_ERSPAN_VER] && |
1091 | nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0) | |
f989d546 WT |
1092 | return 0; |
1093 | ||
1094 | /* ERSPAN type II/III should only have GRE sequence and key flag */ | |
1a66a836 WT |
1095 | if (data[IFLA_GRE_OFLAGS]) |
1096 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1097 | if (data[IFLA_GRE_IFLAGS]) | |
1098 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1099 | if (!data[IFLA_GRE_COLLECT_METADATA] && | |
1100 | flags != (GRE_SEQ | GRE_KEY)) | |
84e54fe0 WT |
1101 | return -EINVAL; |
1102 | ||
1103 | /* ERSPAN Session ID only has 10-bit. Since we reuse | |
1104 | * 32-bit key field as ID, check it's range. | |
1105 | */ | |
1106 | if (data[IFLA_GRE_IKEY] && | |
1107 | (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) | |
1108 | return -EINVAL; | |
1109 | ||
1110 | if (data[IFLA_GRE_OKEY] && | |
1111 | (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) | |
1112 | return -EINVAL; | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
22a59be8 | 1117 | static int ipgre_netlink_parms(struct net_device *dev, |
2e15ea39 PS |
1118 | struct nlattr *data[], |
1119 | struct nlattr *tb[], | |
9830ad4c CG |
1120 | struct ip_tunnel_parm *parms, |
1121 | __u32 *fwmark) | |
c19e654d | 1122 | { |
22a59be8 PP |
1123 | struct ip_tunnel *t = netdev_priv(dev); |
1124 | ||
7bb82d92 | 1125 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1126 | |
1127 | parms->iph.protocol = IPPROTO_GRE; | |
1128 | ||
1129 | if (!data) | |
22a59be8 | 1130 | return 0; |
c19e654d HX |
1131 | |
1132 | if (data[IFLA_GRE_LINK]) | |
1133 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1134 | ||
1135 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 1136 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
1137 | |
1138 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 1139 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
1140 | |
1141 | if (data[IFLA_GRE_IKEY]) | |
1142 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1143 | ||
1144 | if (data[IFLA_GRE_OKEY]) | |
1145 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1146 | ||
1147 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 1148 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1149 | |
1150 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 1151 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1152 | |
1153 | if (data[IFLA_GRE_TTL]) | |
1154 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1155 | ||
1156 | if (data[IFLA_GRE_TOS]) | |
1157 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1158 | ||
22a59be8 PP |
1159 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) { |
1160 | if (t->ignore_df) | |
1161 | return -EINVAL; | |
c19e654d | 1162 | parms->iph.frag_off = htons(IP_DF); |
22a59be8 | 1163 | } |
2e15ea39 PS |
1164 | |
1165 | if (data[IFLA_GRE_COLLECT_METADATA]) { | |
2e15ea39 | 1166 | t->collect_md = true; |
e271c7b4 JB |
1167 | if (dev->type == ARPHRD_IPGRE) |
1168 | dev->type = ARPHRD_NONE; | |
2e15ea39 | 1169 | } |
22a59be8 PP |
1170 | |
1171 | if (data[IFLA_GRE_IGNORE_DF]) { | |
1172 | if (nla_get_u8(data[IFLA_GRE_IGNORE_DF]) | |
1173 | && (parms->iph.frag_off & htons(IP_DF))) | |
1174 | return -EINVAL; | |
1175 | t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]); | |
1176 | } | |
1177 | ||
9830ad4c CG |
1178 | if (data[IFLA_GRE_FWMARK]) |
1179 | *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); | |
1180 | ||
e1f8f78f PM |
1181 | return 0; |
1182 | } | |
1183 | ||
1184 | static int erspan_netlink_parms(struct net_device *dev, | |
1185 | struct nlattr *data[], | |
1186 | struct nlattr *tb[], | |
1187 | struct ip_tunnel_parm *parms, | |
1188 | __u32 *fwmark) | |
1189 | { | |
1190 | struct ip_tunnel *t = netdev_priv(dev); | |
1191 | int err; | |
1192 | ||
1193 | err = ipgre_netlink_parms(dev, data, tb, parms, fwmark); | |
1194 | if (err) | |
1195 | return err; | |
32ca98fe PM |
1196 | if (!data) |
1197 | return 0; | |
e1f8f78f | 1198 | |
f551c91d WT |
1199 | if (data[IFLA_GRE_ERSPAN_VER]) { |
1200 | t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); | |
84e54fe0 | 1201 | |
f989d546 | 1202 | if (t->erspan_ver > 2) |
84e54fe0 WT |
1203 | return -EINVAL; |
1204 | } | |
1205 | ||
f551c91d WT |
1206 | if (t->erspan_ver == 1) { |
1207 | if (data[IFLA_GRE_ERSPAN_INDEX]) { | |
1208 | t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); | |
1209 | if (t->index & ~INDEX_MASK) | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | } else if (t->erspan_ver == 2) { | |
1213 | if (data[IFLA_GRE_ERSPAN_DIR]) { | |
1214 | t->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); | |
1215 | if (t->dir & ~(DIR_MASK >> DIR_OFFSET)) | |
1216 | return -EINVAL; | |
1217 | } | |
1218 | if (data[IFLA_GRE_ERSPAN_HWID]) { | |
1219 | t->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); | |
1220 | if (t->hwid & ~(HWID_MASK >> HWID_OFFSET)) | |
1221 | return -EINVAL; | |
1222 | } | |
1223 | } | |
1224 | ||
22a59be8 | 1225 | return 0; |
c19e654d HX |
1226 | } |
1227 | ||
4565e991 TH |
1228 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1229 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], | |
1230 | struct ip_tunnel_encap *ipencap) | |
1231 | { | |
1232 | bool ret = false; | |
1233 | ||
1234 | memset(ipencap, 0, sizeof(*ipencap)); | |
1235 | ||
1236 | if (!data) | |
1237 | return ret; | |
1238 | ||
1239 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
1240 | ret = true; | |
1241 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
1242 | } | |
1243 | ||
1244 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
1245 | ret = true; | |
1246 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
1247 | } | |
1248 | ||
1249 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
1250 | ret = true; | |
3e97fa70 | 1251 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
4565e991 TH |
1252 | } |
1253 | ||
1254 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
1255 | ret = true; | |
3e97fa70 | 1256 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
4565e991 TH |
1257 | } |
1258 | ||
1259 | return ret; | |
1260 | } | |
1261 | ||
c5441932 | 1262 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 1263 | { |
c5441932 | 1264 | __gre_tunnel_init(dev); |
bec94d43 | 1265 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d51711c0 | 1266 | netif_keep_dst(dev); |
e1a80002 | 1267 | |
c5441932 | 1268 | return ip_tunnel_init(dev); |
e1a80002 HX |
1269 | } |
1270 | ||
c5441932 PS |
1271 | static const struct net_device_ops gre_tap_netdev_ops = { |
1272 | .ndo_init = gre_tap_init, | |
1273 | .ndo_uninit = ip_tunnel_uninit, | |
1274 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
1275 | .ndo_set_mac_address = eth_mac_addr, |
1276 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 | 1277 | .ndo_change_mtu = ip_tunnel_change_mtu, |
98d7fc46 | 1278 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 1279 | .ndo_get_iflink = ip_tunnel_get_iflink, |
fc4099f1 | 1280 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
b8c26a33 SH |
1281 | }; |
1282 | ||
84e54fe0 WT |
1283 | static int erspan_tunnel_init(struct net_device *dev) |
1284 | { | |
1285 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
84e54fe0 | 1286 | |
f989d546 WT |
1287 | if (tunnel->erspan_ver == 0) |
1288 | tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */ | |
1289 | else | |
1290 | tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */ | |
1291 | ||
84e54fe0 | 1292 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
c122fda2 | 1293 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
f551c91d | 1294 | erspan_hdr_len(tunnel->erspan_ver); |
84e54fe0 | 1295 | |
84e54fe0 WT |
1296 | dev->features |= GRE_FEATURES; |
1297 | dev->hw_features |= GRE_FEATURES; | |
1298 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c84bed44 | 1299 | netif_keep_dst(dev); |
84e54fe0 WT |
1300 | |
1301 | return ip_tunnel_init(dev); | |
1302 | } | |
1303 | ||
1304 | static const struct net_device_ops erspan_netdev_ops = { | |
1305 | .ndo_init = erspan_tunnel_init, | |
1306 | .ndo_uninit = ip_tunnel_uninit, | |
1307 | .ndo_start_xmit = erspan_xmit, | |
1308 | .ndo_set_mac_address = eth_mac_addr, | |
1309 | .ndo_validate_addr = eth_validate_addr, | |
1310 | .ndo_change_mtu = ip_tunnel_change_mtu, | |
98d7fc46 | 1311 | .ndo_get_stats64 = dev_get_tstats64, |
84e54fe0 WT |
1312 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1313 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, | |
1314 | }; | |
1315 | ||
e1a80002 HX |
1316 | static void ipgre_tap_setup(struct net_device *dev) |
1317 | { | |
e1a80002 | 1318 | ether_setup(dev); |
cfddd4c3 | 1319 | dev->max_mtu = 0; |
d13b161c JB |
1320 | dev->netdev_ops = &gre_tap_netdev_ops; |
1321 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1322 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c5441932 | 1323 | ip_tunnel_setup(dev, gre_tap_net_id); |
e1a80002 HX |
1324 | } |
1325 | ||
e1f8f78f PM |
1326 | static int |
1327 | ipgre_newlink_encap_setup(struct net_device *dev, struct nlattr *data[]) | |
c19e654d | 1328 | { |
4565e991 TH |
1329 | struct ip_tunnel_encap ipencap; |
1330 | ||
1331 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1332 | struct ip_tunnel *t = netdev_priv(dev); | |
e1f8f78f | 1333 | int err = ip_tunnel_encap_setup(t, &ipencap); |
4565e991 TH |
1334 | |
1335 | if (err < 0) | |
1336 | return err; | |
1337 | } | |
c19e654d | 1338 | |
e1f8f78f PM |
1339 | return 0; |
1340 | } | |
1341 | ||
1342 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, | |
1343 | struct nlattr *tb[], struct nlattr *data[], | |
1344 | struct netlink_ext_ack *extack) | |
1345 | { | |
1346 | struct ip_tunnel_parm p; | |
1347 | __u32 fwmark = 0; | |
1348 | int err; | |
1349 | ||
1350 | err = ipgre_newlink_encap_setup(dev, data); | |
1351 | if (err) | |
1352 | return err; | |
1353 | ||
9830ad4c | 1354 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
22a59be8 PP |
1355 | if (err < 0) |
1356 | return err; | |
9830ad4c | 1357 | return ip_tunnel_newlink(dev, tb, &p, fwmark); |
c19e654d HX |
1358 | } |
1359 | ||
e1f8f78f PM |
1360 | static int erspan_newlink(struct net *src_net, struct net_device *dev, |
1361 | struct nlattr *tb[], struct nlattr *data[], | |
1362 | struct netlink_ext_ack *extack) | |
1363 | { | |
1364 | struct ip_tunnel_parm p; | |
1365 | __u32 fwmark = 0; | |
1366 | int err; | |
1367 | ||
1368 | err = ipgre_newlink_encap_setup(dev, data); | |
1369 | if (err) | |
1370 | return err; | |
1371 | ||
1372 | err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); | |
1373 | if (err) | |
1374 | return err; | |
1375 | return ip_tunnel_newlink(dev, tb, &p, fwmark); | |
1376 | } | |
1377 | ||
c19e654d | 1378 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
ad744b22 MS |
1379 | struct nlattr *data[], |
1380 | struct netlink_ext_ack *extack) | |
c19e654d | 1381 | { |
9830ad4c | 1382 | struct ip_tunnel *t = netdev_priv(dev); |
9830ad4c | 1383 | __u32 fwmark = t->fwmark; |
dd9d598c | 1384 | struct ip_tunnel_parm p; |
22a59be8 | 1385 | int err; |
4565e991 | 1386 | |
e1f8f78f PM |
1387 | err = ipgre_newlink_encap_setup(dev, data); |
1388 | if (err) | |
1389 | return err; | |
c19e654d | 1390 | |
9830ad4c | 1391 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
22a59be8 PP |
1392 | if (err < 0) |
1393 | return err; | |
dd9d598c XL |
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; | |
1401 | ||
e1f8f78f PM |
1402 | ipgre_link_update(dev, !tb[IFLA_MTU]); |
1403 | ||
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static int erspan_changelink(struct net_device *dev, struct nlattr *tb[], | |
1408 | struct nlattr *data[], | |
1409 | struct netlink_ext_ack *extack) | |
1410 | { | |
1411 | struct ip_tunnel *t = netdev_priv(dev); | |
1412 | __u32 fwmark = t->fwmark; | |
1413 | struct ip_tunnel_parm p; | |
1414 | int err; | |
1415 | ||
1416 | err = ipgre_newlink_encap_setup(dev, data); | |
1417 | if (err) | |
1418 | return err; | |
1419 | ||
1420 | err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); | |
1421 | if (err < 0) | |
1422 | return err; | |
1423 | ||
1424 | err = ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1425 | if (err < 0) | |
1426 | return err; | |
1427 | ||
1428 | t->parms.i_flags = p.i_flags; | |
1429 | t->parms.o_flags = p.o_flags; | |
dd9d598c XL |
1430 | |
1431 | return 0; | |
c19e654d HX |
1432 | } |
1433 | ||
1434 | static size_t ipgre_get_size(const struct net_device *dev) | |
1435 | { | |
1436 | return | |
1437 | /* IFLA_GRE_LINK */ | |
1438 | nla_total_size(4) + | |
1439 | /* IFLA_GRE_IFLAGS */ | |
1440 | nla_total_size(2) + | |
1441 | /* IFLA_GRE_OFLAGS */ | |
1442 | nla_total_size(2) + | |
1443 | /* IFLA_GRE_IKEY */ | |
1444 | nla_total_size(4) + | |
1445 | /* IFLA_GRE_OKEY */ | |
1446 | nla_total_size(4) + | |
1447 | /* IFLA_GRE_LOCAL */ | |
1448 | nla_total_size(4) + | |
1449 | /* IFLA_GRE_REMOTE */ | |
1450 | nla_total_size(4) + | |
1451 | /* IFLA_GRE_TTL */ | |
1452 | nla_total_size(1) + | |
1453 | /* IFLA_GRE_TOS */ | |
1454 | nla_total_size(1) + | |
1455 | /* IFLA_GRE_PMTUDISC */ | |
1456 | nla_total_size(1) + | |
4565e991 TH |
1457 | /* IFLA_GRE_ENCAP_TYPE */ |
1458 | nla_total_size(2) + | |
1459 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1460 | nla_total_size(2) + | |
1461 | /* IFLA_GRE_ENCAP_SPORT */ | |
1462 | nla_total_size(2) + | |
1463 | /* IFLA_GRE_ENCAP_DPORT */ | |
1464 | nla_total_size(2) + | |
2e15ea39 PS |
1465 | /* IFLA_GRE_COLLECT_METADATA */ |
1466 | nla_total_size(0) + | |
22a59be8 PP |
1467 | /* IFLA_GRE_IGNORE_DF */ |
1468 | nla_total_size(1) + | |
9830ad4c CG |
1469 | /* IFLA_GRE_FWMARK */ |
1470 | nla_total_size(4) + | |
84e54fe0 WT |
1471 | /* IFLA_GRE_ERSPAN_INDEX */ |
1472 | nla_total_size(4) + | |
f551c91d WT |
1473 | /* IFLA_GRE_ERSPAN_VER */ |
1474 | nla_total_size(1) + | |
1475 | /* IFLA_GRE_ERSPAN_DIR */ | |
1476 | nla_total_size(1) + | |
1477 | /* IFLA_GRE_ERSPAN_HWID */ | |
1478 | nla_total_size(2) + | |
c19e654d HX |
1479 | 0; |
1480 | } | |
1481 | ||
1482 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1483 | { | |
1484 | struct ip_tunnel *t = netdev_priv(dev); | |
1485 | struct ip_tunnel_parm *p = &t->parms; | |
feaf5c79 LB |
1486 | __be16 o_flags = p->o_flags; |
1487 | ||
f989d546 WT |
1488 | if (t->erspan_ver <= 2) { |
1489 | if (t->erspan_ver != 0 && !t->collect_md) | |
2bdf700e LB |
1490 | o_flags |= TUNNEL_KEY; |
1491 | ||
1492 | if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver)) | |
1493 | goto nla_put_failure; | |
1494 | ||
1495 | if (t->erspan_ver == 1) { | |
1496 | if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) | |
1497 | goto nla_put_failure; | |
f989d546 | 1498 | } else if (t->erspan_ver == 2) { |
2bdf700e LB |
1499 | if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir)) |
1500 | goto nla_put_failure; | |
1501 | if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid)) | |
1502 | goto nla_put_failure; | |
1503 | } | |
1504 | } | |
c19e654d | 1505 | |
f3756b79 | 1506 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
95f5c64c TH |
1507 | nla_put_be16(skb, IFLA_GRE_IFLAGS, |
1508 | gre_tnl_flags_to_gre_flags(p->i_flags)) || | |
1509 | nla_put_be16(skb, IFLA_GRE_OFLAGS, | |
feaf5c79 | 1510 | gre_tnl_flags_to_gre_flags(o_flags)) || |
f3756b79 DM |
1511 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1512 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1513 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
1514 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
f3756b79 DM |
1515 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
1516 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1517 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
9830ad4c CG |
1518 | !!(p->iph.frag_off & htons(IP_DF))) || |
1519 | nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark)) | |
f3756b79 | 1520 | goto nla_put_failure; |
4565e991 TH |
1521 | |
1522 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1523 | t->encap.type) || | |
3e97fa70 SD |
1524 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
1525 | t->encap.sport) || | |
1526 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1527 | t->encap.dport) || | |
4565e991 | 1528 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
e1b2cb65 | 1529 | t->encap.flags)) |
4565e991 TH |
1530 | goto nla_put_failure; |
1531 | ||
22a59be8 PP |
1532 | if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df)) |
1533 | goto nla_put_failure; | |
1534 | ||
2e15ea39 PS |
1535 | if (t->collect_md) { |
1536 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) | |
1537 | goto nla_put_failure; | |
1538 | } | |
1539 | ||
c19e654d HX |
1540 | return 0; |
1541 | ||
1542 | nla_put_failure: | |
1543 | return -EMSGSIZE; | |
1544 | } | |
1545 | ||
84e54fe0 WT |
1546 | static void erspan_setup(struct net_device *dev) |
1547 | { | |
84581bda XL |
1548 | struct ip_tunnel *t = netdev_priv(dev); |
1549 | ||
84e54fe0 | 1550 | ether_setup(dev); |
0e141f75 | 1551 | dev->max_mtu = 0; |
84e54fe0 WT |
1552 | dev->netdev_ops = &erspan_netdev_ops; |
1553 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1554 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
1555 | ip_tunnel_setup(dev, erspan_net_id); | |
84581bda | 1556 | t->erspan_ver = 1; |
84e54fe0 WT |
1557 | } |
1558 | ||
c19e654d HX |
1559 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
1560 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1561 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1562 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1563 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1564 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
c593642c PB |
1565 | [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, |
1566 | [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, | |
c19e654d HX |
1567 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1568 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1569 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
4565e991 TH |
1570 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1571 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1572 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1573 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2e15ea39 | 1574 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
22a59be8 | 1575 | [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, |
9830ad4c | 1576 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
84e54fe0 | 1577 | [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
f551c91d WT |
1578 | [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
1579 | [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, | |
1580 | [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, | |
c19e654d HX |
1581 | }; |
1582 | ||
1583 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1584 | .kind = "gre", | |
1585 | .maxtype = IFLA_GRE_MAX, | |
1586 | .policy = ipgre_policy, | |
1587 | .priv_size = sizeof(struct ip_tunnel), | |
1588 | .setup = ipgre_tunnel_setup, | |
1589 | .validate = ipgre_tunnel_validate, | |
1590 | .newlink = ipgre_newlink, | |
1591 | .changelink = ipgre_changelink, | |
c5441932 | 1592 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
1593 | .get_size = ipgre_get_size, |
1594 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1595 | .get_link_net = ip_tunnel_get_link_net, |
c19e654d HX |
1596 | }; |
1597 | ||
e1a80002 HX |
1598 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1599 | .kind = "gretap", | |
1600 | .maxtype = IFLA_GRE_MAX, | |
1601 | .policy = ipgre_policy, | |
1602 | .priv_size = sizeof(struct ip_tunnel), | |
1603 | .setup = ipgre_tap_setup, | |
1604 | .validate = ipgre_tap_validate, | |
1605 | .newlink = ipgre_newlink, | |
1606 | .changelink = ipgre_changelink, | |
c5441932 | 1607 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
1608 | .get_size = ipgre_get_size, |
1609 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1610 | .get_link_net = ip_tunnel_get_link_net, |
e1a80002 HX |
1611 | }; |
1612 | ||
84e54fe0 WT |
1613 | static struct rtnl_link_ops erspan_link_ops __read_mostly = { |
1614 | .kind = "erspan", | |
1615 | .maxtype = IFLA_GRE_MAX, | |
1616 | .policy = ipgre_policy, | |
1617 | .priv_size = sizeof(struct ip_tunnel), | |
1618 | .setup = erspan_setup, | |
1619 | .validate = erspan_validate, | |
e1f8f78f PM |
1620 | .newlink = erspan_newlink, |
1621 | .changelink = erspan_changelink, | |
84e54fe0 WT |
1622 | .dellink = ip_tunnel_dellink, |
1623 | .get_size = ipgre_get_size, | |
1624 | .fill_info = ipgre_fill_info, | |
1625 | .get_link_net = ip_tunnel_get_link_net, | |
1626 | }; | |
1627 | ||
b2acd1dc PS |
1628 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1629 | u8 name_assign_type) | |
1630 | { | |
1631 | struct nlattr *tb[IFLA_MAX + 1]; | |
1632 | struct net_device *dev; | |
106da663 | 1633 | LIST_HEAD(list_kill); |
b2acd1dc PS |
1634 | struct ip_tunnel *t; |
1635 | int err; | |
1636 | ||
1637 | memset(&tb, 0, sizeof(tb)); | |
1638 | ||
1639 | dev = rtnl_create_link(net, name, name_assign_type, | |
d0522f1c | 1640 | &ipgre_tap_ops, tb, NULL); |
b2acd1dc PS |
1641 | if (IS_ERR(dev)) |
1642 | return dev; | |
1643 | ||
1644 | /* Configure flow based GRE device. */ | |
1645 | t = netdev_priv(dev); | |
1646 | t->collect_md = true; | |
1647 | ||
7a3f4a18 | 1648 | err = ipgre_newlink(net, dev, tb, NULL, NULL); |
106da663 ND |
1649 | if (err < 0) { |
1650 | free_netdev(dev); | |
1651 | return ERR_PTR(err); | |
1652 | } | |
7e059158 DW |
1653 | |
1654 | /* openvswitch users expect packet sizes to be unrestricted, | |
1655 | * so set the largest MTU we can. | |
1656 | */ | |
1657 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); | |
1658 | if (err) | |
1659 | goto out; | |
1660 | ||
da6f1da8 ND |
1661 | err = rtnl_configure_link(dev, NULL); |
1662 | if (err < 0) | |
1663 | goto out; | |
1664 | ||
b2acd1dc PS |
1665 | return dev; |
1666 | out: | |
106da663 ND |
1667 | ip_tunnel_dellink(dev, &list_kill); |
1668 | unregister_netdevice_many(&list_kill); | |
b2acd1dc PS |
1669 | return ERR_PTR(err); |
1670 | } | |
1671 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); | |
1672 | ||
c5441932 PS |
1673 | static int __net_init ipgre_tap_init_net(struct net *net) |
1674 | { | |
2e15ea39 | 1675 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
c5441932 PS |
1676 | } |
1677 | ||
64bc1781 | 1678 | static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net) |
c5441932 | 1679 | { |
64bc1781 | 1680 | ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops); |
c5441932 PS |
1681 | } |
1682 | ||
1683 | static struct pernet_operations ipgre_tap_net_ops = { | |
1684 | .init = ipgre_tap_init_net, | |
64bc1781 | 1685 | .exit_batch = ipgre_tap_exit_batch_net, |
c5441932 PS |
1686 | .id = &gre_tap_net_id, |
1687 | .size = sizeof(struct ip_tunnel_net), | |
1688 | }; | |
1da177e4 | 1689 | |
84e54fe0 WT |
1690 | static int __net_init erspan_init_net(struct net *net) |
1691 | { | |
1692 | return ip_tunnel_init_net(net, erspan_net_id, | |
1693 | &erspan_link_ops, "erspan0"); | |
1694 | } | |
1695 | ||
64bc1781 | 1696 | static void __net_exit erspan_exit_batch_net(struct list_head *net_list) |
84e54fe0 | 1697 | { |
64bc1781 | 1698 | ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops); |
84e54fe0 WT |
1699 | } |
1700 | ||
1701 | static struct pernet_operations erspan_net_ops = { | |
1702 | .init = erspan_init_net, | |
64bc1781 | 1703 | .exit_batch = erspan_exit_batch_net, |
84e54fe0 WT |
1704 | .id = &erspan_net_id, |
1705 | .size = sizeof(struct ip_tunnel_net), | |
1706 | }; | |
1707 | ||
1da177e4 LT |
1708 | static int __init ipgre_init(void) |
1709 | { | |
1710 | int err; | |
1711 | ||
058bd4d2 | 1712 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1713 | |
cfb8fbf2 | 1714 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1715 | if (err < 0) |
c2892f02 AD |
1716 | return err; |
1717 | ||
c5441932 PS |
1718 | err = register_pernet_device(&ipgre_tap_net_ops); |
1719 | if (err < 0) | |
e3d0328c | 1720 | goto pnet_tap_failed; |
c5441932 | 1721 | |
84e54fe0 WT |
1722 | err = register_pernet_device(&erspan_net_ops); |
1723 | if (err < 0) | |
1724 | goto pnet_erspan_failed; | |
1725 | ||
9f57c67c | 1726 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1727 | if (err < 0) { |
058bd4d2 | 1728 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1729 | goto add_proto_failed; |
1730 | } | |
7daa0004 | 1731 | |
c19e654d HX |
1732 | err = rtnl_link_register(&ipgre_link_ops); |
1733 | if (err < 0) | |
1734 | goto rtnl_link_failed; | |
1735 | ||
e1a80002 HX |
1736 | err = rtnl_link_register(&ipgre_tap_ops); |
1737 | if (err < 0) | |
1738 | goto tap_ops_failed; | |
1739 | ||
84e54fe0 WT |
1740 | err = rtnl_link_register(&erspan_link_ops); |
1741 | if (err < 0) | |
1742 | goto erspan_link_failed; | |
1743 | ||
c5441932 | 1744 | return 0; |
c19e654d | 1745 | |
84e54fe0 WT |
1746 | erspan_link_failed: |
1747 | rtnl_link_unregister(&ipgre_tap_ops); | |
e1a80002 HX |
1748 | tap_ops_failed: |
1749 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1750 | rtnl_link_failed: |
9f57c67c | 1751 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1752 | add_proto_failed: |
84e54fe0 WT |
1753 | unregister_pernet_device(&erspan_net_ops); |
1754 | pnet_erspan_failed: | |
c5441932 | 1755 | unregister_pernet_device(&ipgre_tap_net_ops); |
e3d0328c | 1756 | pnet_tap_failed: |
c2892f02 | 1757 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1758 | return err; |
1da177e4 LT |
1759 | } |
1760 | ||
db44575f | 1761 | static void __exit ipgre_fini(void) |
1da177e4 | 1762 | { |
e1a80002 | 1763 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1764 | rtnl_link_unregister(&ipgre_link_ops); |
84e54fe0 | 1765 | rtnl_link_unregister(&erspan_link_ops); |
9f57c67c | 1766 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c5441932 | 1767 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1768 | unregister_pernet_device(&ipgre_net_ops); |
84e54fe0 | 1769 | unregister_pernet_device(&erspan_net_ops); |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | module_init(ipgre_init); | |
1773 | module_exit(ipgre_fini); | |
1774 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1775 | MODULE_ALIAS_RTNL_LINK("gre"); |
1776 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
84e54fe0 | 1777 | MODULE_ALIAS_RTNL_LINK("erspan"); |
8909c9ad | 1778 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1779 | MODULE_ALIAS_NETDEV("gretap0"); |
84e54fe0 | 1780 | MODULE_ALIAS_NETDEV("erspan0"); |