1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Linux NET3: GRE over IP protocol decoder. |
4 | * |
5 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) |
6 | */ |
7 | |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | |
10 | #include <linux/capability.h> |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/uaccess.h> |
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> |
22 | #include <linux/if_vlan.h> |
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> |
28 | #include <linux/etherdevice.h> |
29 | #include <linux/if_ether.h> |
30 | |
31 | #include <net/sock.h> |
32 | #include <net/ip.h> |
33 | #include <net/icmp.h> |
34 | #include <net/protocol.h> |
35 | #include <net/ip_tunnels.h> |
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> |
41 | #include <net/net_namespace.h> |
42 | #include <net/netns/generic.h> |
43 | #include <net/rtnetlink.h> |
44 | #include <net/gre.h> |
45 | #include <net/dst_metadata.h> |
46 | #include <net/erspan.h> |
47 | |
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), |
60 | and silently drop packet when it expires. It is a good |
61 | solution, but it supposes maintaining new variable in ALL |
62 | skb, even if no tunneling is used. |
63 | |
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 |
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, |
87 | taking into account fragmentation. TO be short, ttl is not solution at all. |
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 |
94 | rapidly degrades to value <68, where looping stops. |
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 | |
102 | Alexey Kuznetsov. |
103 | */ |
104 | |
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 | |
109 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
110 | static const struct header_ops ; |
111 | |
112 | static int ipgre_tunnel_init(struct net_device *dev); |
113 | static void (struct sk_buff *skb, |
114 | u32 id, u32 index, |
115 | bool truncate, bool is_ipv4); |
116 | |
117 | static unsigned int ipgre_net_id __read_mostly; |
118 | static unsigned int gre_tap_net_id __read_mostly; |
119 | static unsigned int erspan_net_id __read_mostly; |
120 | |
121 | static int ipgre_err(struct sk_buff *skb, u32 info, |
122 | const struct tnl_ptk_info *tpi) |
123 | { |
124 | |
125 | /* All the routers (except for Linux) return only |
126 | 8 bytes of packet payload. It means, that precise relaying of |
127 | ICMP in the real Internet is absolutely infeasible. |
128 | |
129 | Moreover, Cisco "wise men" put GRE key to the third word |
130 | in GRE header. It makes impossible maintaining even soft |
131 | state for keyed GRE tunnels with enabled checksum. Tell |
132 | them "thank you". |
133 | |
134 | Well, I wonder, rfc1812 was written by Cisco employee, |
135 | what the hell these idiots break standards established |
136 | by themselves??? |
137 | */ |
138 | struct net *net = dev_net(dev: skb->dev); |
139 | struct ip_tunnel_net *itn; |
140 | const struct iphdr *iph; |
141 | const int type = icmp_hdr(skb)->type; |
142 | const int code = icmp_hdr(skb)->code; |
143 | unsigned int data_len = 0; |
144 | struct ip_tunnel *t; |
145 | |
146 | if (tpi->proto == htons(ETH_P_TEB)) |
147 | itn = net_generic(net, id: gre_tap_net_id); |
148 | else if (tpi->proto == htons(ETH_P_ERSPAN) || |
149 | tpi->proto == htons(ETH_P_ERSPAN2)) |
150 | itn = net_generic(net, id: erspan_net_id); |
151 | else |
152 | itn = net_generic(net, id: ipgre_net_id); |
153 | |
154 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
155 | t = ip_tunnel_lookup(itn, link: skb->dev->ifindex, flags: tpi->flags, |
156 | remote: iph->daddr, local: iph->saddr, key: tpi->key); |
157 | |
158 | if (!t) |
159 | return -ENOENT; |
160 | |
161 | switch (type) { |
162 | default: |
163 | case ICMP_PARAMETERPROB: |
164 | return 0; |
165 | |
166 | case ICMP_DEST_UNREACH: |
167 | switch (code) { |
168 | case ICMP_SR_FAILED: |
169 | case ICMP_PORT_UNREACH: |
170 | /* Impossible event. */ |
171 | return 0; |
172 | default: |
173 | /* All others are translated to HOST_UNREACH. |
174 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
175 | I believe they are just ether pollution. --ANK |
176 | */ |
177 | break; |
178 | } |
179 | break; |
180 | |
181 | case ICMP_TIME_EXCEEDED: |
182 | if (code != ICMP_EXC_TTL) |
183 | return 0; |
184 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
185 | break; |
186 | |
187 | case ICMP_REDIRECT: |
188 | break; |
189 | } |
190 | |
191 | #if IS_ENABLED(CONFIG_IPV6) |
192 | if (tpi->proto == htons(ETH_P_IPV6) && |
193 | !ip6_err_gen_icmpv6_unreach(skb, nhs: iph->ihl * 4 + tpi->hdr_len, |
194 | type, data_len)) |
195 | return 0; |
196 | #endif |
197 | |
198 | if (t->parms.iph.daddr == 0 || |
199 | ipv4_is_multicast(addr: t->parms.iph.daddr)) |
200 | return 0; |
201 | |
202 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
203 | return 0; |
204 | |
205 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
206 | t->err_count++; |
207 | else |
208 | t->err_count = 1; |
209 | t->err_time = jiffies; |
210 | |
211 | return 0; |
212 | } |
213 | |
214 | static void gre_err(struct sk_buff *skb, u32 info) |
215 | { |
216 | /* All the routers (except for Linux) return only |
217 | * 8 bytes of packet payload. It means, that precise relaying of |
218 | * ICMP in the real Internet is absolutely infeasible. |
219 | * |
220 | * Moreover, Cisco "wise men" put GRE key to the third word |
221 | * in GRE header. It makes impossible maintaining even soft |
222 | * state for keyed |
223 | * GRE tunnels with enabled checksum. Tell them "thank you". |
224 | * |
225 | * Well, I wonder, rfc1812 was written by Cisco employee, |
226 | * what the hell these idiots break standards established |
227 | * by themselves??? |
228 | */ |
229 | |
230 | const struct iphdr *iph = (struct iphdr *)skb->data; |
231 | const int type = icmp_hdr(skb)->type; |
232 | const int code = icmp_hdr(skb)->code; |
233 | struct tnl_ptk_info tpi; |
234 | |
235 | if (gre_parse_header(skb, tpi: &tpi, NULL, htons(ETH_P_IP), |
236 | nhs: iph->ihl * 4) < 0) |
237 | return; |
238 | |
239 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
240 | ipv4_update_pmtu(skb, net: dev_net(dev: skb->dev), mtu: info, |
241 | oif: skb->dev->ifindex, IPPROTO_GRE); |
242 | return; |
243 | } |
244 | if (type == ICMP_REDIRECT) { |
245 | ipv4_redirect(skb, net: dev_net(dev: skb->dev), oif: skb->dev->ifindex, |
246 | IPPROTO_GRE); |
247 | return; |
248 | } |
249 | |
250 | ipgre_err(skb, info, tpi: &tpi); |
251 | } |
252 | |
253 | static bool is_erspan_type1(int gre_hdr_len) |
254 | { |
255 | /* Both ERSPAN type I (version 0) and type II (version 1) use |
256 | * protocol 0x88BE, but the type I has only 4-byte GRE header, |
257 | * while type II has 8-byte. |
258 | */ |
259 | return gre_hdr_len == 4; |
260 | } |
261 | |
262 | static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
263 | int gre_hdr_len) |
264 | { |
265 | struct net *net = dev_net(dev: skb->dev); |
266 | struct metadata_dst *tun_dst = NULL; |
267 | struct erspan_base_hdr *ershdr; |
268 | struct ip_tunnel_net *itn; |
269 | struct ip_tunnel *tunnel; |
270 | const struct iphdr *iph; |
271 | struct erspan_md2 *md2; |
272 | int ver; |
273 | int len; |
274 | |
275 | itn = net_generic(net, id: erspan_net_id); |
276 | iph = ip_hdr(skb); |
277 | if (is_erspan_type1(gre_hdr_len)) { |
278 | ver = 0; |
279 | tunnel = ip_tunnel_lookup(itn, link: skb->dev->ifindex, |
280 | flags: tpi->flags | TUNNEL_NO_KEY, |
281 | remote: iph->saddr, local: iph->daddr, key: 0); |
282 | } else { |
283 | if (unlikely(!pskb_may_pull(skb, |
284 | gre_hdr_len + sizeof(*ershdr)))) |
285 | return PACKET_REJECT; |
286 | |
287 | ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len); |
288 | ver = ershdr->ver; |
289 | iph = ip_hdr(skb); |
290 | tunnel = ip_tunnel_lookup(itn, link: skb->dev->ifindex, |
291 | flags: tpi->flags | TUNNEL_KEY, |
292 | remote: iph->saddr, local: iph->daddr, key: tpi->key); |
293 | } |
294 | |
295 | if (tunnel) { |
296 | if (is_erspan_type1(gre_hdr_len)) |
297 | len = gre_hdr_len; |
298 | else |
299 | len = gre_hdr_len + erspan_hdr_len(version: ver); |
300 | |
301 | if (unlikely(!pskb_may_pull(skb, len))) |
302 | return PACKET_REJECT; |
303 | |
304 | if (__iptunnel_pull_header(skb, |
305 | hdr_len: len, |
306 | htons(ETH_P_TEB), |
307 | raw_proto: false, xnet: false) < 0) |
308 | goto drop; |
309 | |
310 | if (tunnel->collect_md) { |
311 | struct erspan_metadata *pkt_md, *md; |
312 | struct ip_tunnel_info *info; |
313 | unsigned char *gh; |
314 | __be64 tun_id; |
315 | __be16 flags; |
316 | |
317 | tpi->flags |= TUNNEL_KEY; |
318 | flags = tpi->flags; |
319 | tun_id = key32_to_tunnel_id(key: tpi->key); |
320 | |
321 | tun_dst = ip_tun_rx_dst(skb, flags, |
322 | tunnel_id: tun_id, md_size: sizeof(*md)); |
323 | if (!tun_dst) |
324 | return PACKET_REJECT; |
325 | |
326 | /* skb can be uncloned in __iptunnel_pull_header, so |
327 | * old pkt_md is no longer valid and we need to reset |
328 | * it |
329 | */ |
330 | gh = skb_network_header(skb) + |
331 | skb_network_header_len(skb); |
332 | pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + |
333 | sizeof(*ershdr)); |
334 | md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
335 | md->version = ver; |
336 | md2 = &md->u.md2; |
337 | memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : |
338 | ERSPAN_V2_MDSIZE); |
339 | |
340 | info = &tun_dst->u.tun_info; |
341 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; |
342 | info->options_len = sizeof(*md); |
343 | } |
344 | |
345 | skb_reset_mac_header(skb); |
346 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
347 | return PACKET_RCVD; |
348 | } |
349 | return PACKET_REJECT; |
350 | |
351 | drop: |
352 | kfree_skb(skb); |
353 | return PACKET_RCVD; |
354 | } |
355 | |
356 | static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
357 | struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) |
358 | { |
359 | struct metadata_dst *tun_dst = NULL; |
360 | const struct iphdr *iph; |
361 | struct ip_tunnel *tunnel; |
362 | |
363 | iph = ip_hdr(skb); |
364 | tunnel = ip_tunnel_lookup(itn, link: skb->dev->ifindex, flags: tpi->flags, |
365 | remote: iph->saddr, local: iph->daddr, key: tpi->key); |
366 | |
367 | if (tunnel) { |
368 | const struct iphdr *tnl_params; |
369 | |
370 | if (__iptunnel_pull_header(skb, hdr_len, inner_proto: tpi->proto, |
371 | raw_proto, xnet: false) < 0) |
372 | goto drop; |
373 | |
374 | /* Special case for ipgre_header_parse(), which expects the |
375 | * mac_header to point to the outer IP header. |
376 | */ |
377 | if (tunnel->dev->header_ops == &ipgre_header_ops) |
378 | skb_pop_mac_header(skb); |
379 | else |
380 | skb_reset_mac_header(skb); |
381 | |
382 | tnl_params = &tunnel->parms.iph; |
383 | if (tunnel->collect_md || tnl_params->daddr == 0) { |
384 | __be16 flags; |
385 | __be64 tun_id; |
386 | |
387 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
388 | tun_id = key32_to_tunnel_id(key: tpi->key); |
389 | tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id: tun_id, md_size: 0); |
390 | if (!tun_dst) |
391 | return PACKET_REJECT; |
392 | } |
393 | |
394 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
395 | return PACKET_RCVD; |
396 | } |
397 | return PACKET_NEXT; |
398 | |
399 | drop: |
400 | kfree_skb(skb); |
401 | return PACKET_RCVD; |
402 | } |
403 | |
404 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
405 | int hdr_len) |
406 | { |
407 | struct net *net = dev_net(dev: skb->dev); |
408 | struct ip_tunnel_net *itn; |
409 | int res; |
410 | |
411 | if (tpi->proto == htons(ETH_P_TEB)) |
412 | itn = net_generic(net, id: gre_tap_net_id); |
413 | else |
414 | itn = net_generic(net, id: ipgre_net_id); |
415 | |
416 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, raw_proto: false); |
417 | if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { |
418 | /* ipgre tunnels in collect metadata mode should receive |
419 | * also ETH_P_TEB traffic. |
420 | */ |
421 | itn = net_generic(net, id: ipgre_net_id); |
422 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, raw_proto: true); |
423 | } |
424 | return res; |
425 | } |
426 | |
427 | static int gre_rcv(struct sk_buff *skb) |
428 | { |
429 | struct tnl_ptk_info tpi; |
430 | bool csum_err = false; |
431 | int hdr_len; |
432 | |
433 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
434 | if (ipv4_is_multicast(addr: ip_hdr(skb)->daddr)) { |
435 | /* Looped back packet, drop it! */ |
436 | if (rt_is_output_route(rt: skb_rtable(skb))) |
437 | goto drop; |
438 | } |
439 | #endif |
440 | |
441 | hdr_len = gre_parse_header(skb, tpi: &tpi, csum_err: &csum_err, htons(ETH_P_IP), nhs: 0); |
442 | if (hdr_len < 0) |
443 | goto drop; |
444 | |
445 | if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
446 | tpi.proto == htons(ETH_P_ERSPAN2))) { |
447 | if (erspan_rcv(skb, tpi: &tpi, gre_hdr_len: hdr_len) == PACKET_RCVD) |
448 | return 0; |
449 | goto out; |
450 | } |
451 | |
452 | if (ipgre_rcv(skb, tpi: &tpi, hdr_len) == PACKET_RCVD) |
453 | return 0; |
454 | |
455 | out: |
456 | icmp_send(skb_in: skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, info: 0); |
457 | drop: |
458 | kfree_skb(skb); |
459 | return 0; |
460 | } |
461 | |
462 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
463 | const struct iphdr *tnl_params, |
464 | __be16 proto) |
465 | { |
466 | struct ip_tunnel *tunnel = netdev_priv(dev); |
467 | __be16 flags = tunnel->parms.o_flags; |
468 | |
469 | /* Push GRE header. */ |
470 | gre_build_header(skb, hdr_len: tunnel->tun_hlen, |
471 | flags, proto, key: tunnel->parms.o_key, |
472 | seq: (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 0); |
473 | |
474 | ip_tunnel_xmit(skb, dev, tnl_params, protocol: tnl_params->protocol); |
475 | } |
476 | |
477 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
478 | { |
479 | return iptunnel_handle_offloads(skb, gso_type_mask: csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
480 | } |
481 | |
482 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
483 | __be16 proto) |
484 | { |
485 | struct ip_tunnel *tunnel = netdev_priv(dev); |
486 | struct ip_tunnel_info *tun_info; |
487 | const struct ip_tunnel_key *key; |
488 | int tunnel_hlen; |
489 | __be16 flags; |
490 | |
491 | tun_info = skb_tunnel_info(skb); |
492 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
493 | ip_tunnel_info_af(tun_info) != AF_INET)) |
494 | goto err_free_skb; |
495 | |
496 | key = &tun_info->key; |
497 | tunnel_hlen = gre_calc_hlen(o_flags: key->tun_flags); |
498 | |
499 | if (skb_cow_head(skb, headroom: dev->needed_headroom)) |
500 | goto err_free_skb; |
501 | |
502 | /* Push Tunnel header. */ |
503 | if (gre_handle_offloads(skb, csum: !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
504 | goto err_free_skb; |
505 | |
506 | flags = tun_info->key.tun_flags & |
507 | (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); |
508 | gre_build_header(skb, hdr_len: tunnel_hlen, flags, proto, |
509 | key: tunnel_id_to_key32(tun_id: tun_info->key.tun_id), |
510 | seq: (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 0); |
511 | |
512 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
513 | |
514 | return; |
515 | |
516 | err_free_skb: |
517 | kfree_skb(skb); |
518 | DEV_STATS_INC(dev, tx_dropped); |
519 | } |
520 | |
521 | static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev) |
522 | { |
523 | struct ip_tunnel *tunnel = netdev_priv(dev); |
524 | struct ip_tunnel_info *tun_info; |
525 | const struct ip_tunnel_key *key; |
526 | struct erspan_metadata *md; |
527 | bool truncate = false; |
528 | __be16 proto; |
529 | int tunnel_hlen; |
530 | int version; |
531 | int nhoff; |
532 | |
533 | tun_info = skb_tunnel_info(skb); |
534 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
535 | ip_tunnel_info_af(tun_info) != AF_INET)) |
536 | goto err_free_skb; |
537 | |
538 | key = &tun_info->key; |
539 | if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
540 | goto err_free_skb; |
541 | if (tun_info->options_len < sizeof(*md)) |
542 | goto err_free_skb; |
543 | md = ip_tunnel_info_opts(tun_info); |
544 | |
545 | /* ERSPAN has fixed 8 byte GRE header */ |
546 | version = md->version; |
547 | tunnel_hlen = 8 + erspan_hdr_len(version); |
548 | |
549 | if (skb_cow_head(skb, headroom: dev->needed_headroom)) |
550 | goto err_free_skb; |
551 | |
552 | if (gre_handle_offloads(skb, csum: false)) |
553 | goto err_free_skb; |
554 | |
555 | if (skb->len > dev->mtu + dev->hard_header_len) { |
556 | if (pskb_trim(skb, len: dev->mtu + dev->hard_header_len)) |
557 | goto err_free_skb; |
558 | truncate = true; |
559 | } |
560 | |
561 | nhoff = skb_network_offset(skb); |
562 | if (skb->protocol == htons(ETH_P_IP) && |
563 | (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) |
564 | truncate = true; |
565 | |
566 | if (skb->protocol == htons(ETH_P_IPV6)) { |
567 | int thoff; |
568 | |
569 | if (skb_transport_header_was_set(skb)) |
570 | thoff = skb_transport_offset(skb); |
571 | else |
572 | thoff = nhoff + sizeof(struct ipv6hdr); |
573 | if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) |
574 | truncate = true; |
575 | } |
576 | |
577 | if (version == 1) { |
578 | erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)), |
579 | ntohl(md->u.index), truncate, is_ipv4: true); |
580 | proto = htons(ETH_P_ERSPAN); |
581 | } else if (version == 2) { |
582 | erspan_build_header_v2(skb, |
583 | ntohl(tunnel_id_to_key32(key->tun_id)), |
584 | direction: md->u.md2.dir, |
585 | hwid: get_hwid(md2: &md->u.md2), |
586 | truncate, is_ipv4: true); |
587 | proto = htons(ETH_P_ERSPAN2); |
588 | } else { |
589 | goto err_free_skb; |
590 | } |
591 | |
592 | gre_build_header(skb, hdr_len: 8, TUNNEL_SEQ, |
593 | proto, key: 0, htonl(atomic_fetch_inc(&tunnel->o_seqno))); |
594 | |
595 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
596 | |
597 | return; |
598 | |
599 | err_free_skb: |
600 | kfree_skb(skb); |
601 | DEV_STATS_INC(dev, tx_dropped); |
602 | } |
603 | |
604 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
605 | { |
606 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
607 | const struct ip_tunnel_key *key; |
608 | struct rtable *rt; |
609 | struct flowi4 fl4; |
610 | |
611 | if (ip_tunnel_info_af(tun_info: info) != AF_INET) |
612 | return -EINVAL; |
613 | |
614 | key = &info->key; |
615 | ip_tunnel_init_flow(fl4: &fl4, IPPROTO_GRE, daddr: key->u.ipv4.dst, saddr: key->u.ipv4.src, |
616 | key: tunnel_id_to_key32(tun_id: key->tun_id), |
617 | tos: key->tos & ~INET_ECN_MASK, net: dev_net(dev), oif: 0, |
618 | mark: skb->mark, tun_inner_hash: skb_get_hash(skb), flow_flags: key->flow_flags); |
619 | rt = ip_route_output_key(net: dev_net(dev), flp: &fl4); |
620 | if (IS_ERR(ptr: rt)) |
621 | return PTR_ERR(ptr: rt); |
622 | |
623 | ip_rt_put(rt); |
624 | info->key.u.ipv4.src = fl4.saddr; |
625 | return 0; |
626 | } |
627 | |
628 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
629 | struct net_device *dev) |
630 | { |
631 | struct ip_tunnel *tunnel = netdev_priv(dev); |
632 | const struct iphdr *tnl_params; |
633 | |
634 | if (!pskb_inet_may_pull(skb)) |
635 | goto free_skb; |
636 | |
637 | if (tunnel->collect_md) { |
638 | gre_fb_xmit(skb, dev, proto: skb->protocol); |
639 | return NETDEV_TX_OK; |
640 | } |
641 | |
642 | if (dev->header_ops) { |
643 | int pull_len = tunnel->hlen + sizeof(struct iphdr); |
644 | |
645 | if (skb_cow_head(skb, headroom: 0)) |
646 | goto free_skb; |
647 | |
648 | tnl_params = (const struct iphdr *)skb->data; |
649 | |
650 | if (!pskb_network_may_pull(skb, len: pull_len)) |
651 | goto free_skb; |
652 | |
653 | /* ip_tunnel_xmit() needs skb->data pointing to gre header. */ |
654 | skb_pull(skb, len: pull_len); |
655 | skb_reset_mac_header(skb); |
656 | |
657 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
658 | skb_checksum_start(skb) < skb->data) |
659 | goto free_skb; |
660 | } else { |
661 | if (skb_cow_head(skb, headroom: dev->needed_headroom)) |
662 | goto free_skb; |
663 | |
664 | tnl_params = &tunnel->parms.iph; |
665 | } |
666 | |
667 | if (gre_handle_offloads(skb, csum: !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
668 | goto free_skb; |
669 | |
670 | __gre_xmit(skb, dev, tnl_params, proto: skb->protocol); |
671 | return NETDEV_TX_OK; |
672 | |
673 | free_skb: |
674 | kfree_skb(skb); |
675 | DEV_STATS_INC(dev, tx_dropped); |
676 | return NETDEV_TX_OK; |
677 | } |
678 | |
679 | static netdev_tx_t erspan_xmit(struct sk_buff *skb, |
680 | struct net_device *dev) |
681 | { |
682 | struct ip_tunnel *tunnel = netdev_priv(dev); |
683 | bool truncate = false; |
684 | __be16 proto; |
685 | |
686 | if (!pskb_inet_may_pull(skb)) |
687 | goto free_skb; |
688 | |
689 | if (tunnel->collect_md) { |
690 | erspan_fb_xmit(skb, dev); |
691 | return NETDEV_TX_OK; |
692 | } |
693 | |
694 | if (gre_handle_offloads(skb, csum: false)) |
695 | goto free_skb; |
696 | |
697 | if (skb_cow_head(skb, headroom: dev->needed_headroom)) |
698 | goto free_skb; |
699 | |
700 | if (skb->len > dev->mtu + dev->hard_header_len) { |
701 | if (pskb_trim(skb, len: dev->mtu + dev->hard_header_len)) |
702 | goto free_skb; |
703 | truncate = true; |
704 | } |
705 | |
706 | /* Push ERSPAN header */ |
707 | if (tunnel->erspan_ver == 0) { |
708 | proto = htons(ETH_P_ERSPAN); |
709 | tunnel->parms.o_flags &= ~TUNNEL_SEQ; |
710 | } else if (tunnel->erspan_ver == 1) { |
711 | erspan_build_header(skb, ntohl(tunnel->parms.o_key), |
712 | index: tunnel->index, |
713 | truncate, is_ipv4: true); |
714 | proto = htons(ETH_P_ERSPAN); |
715 | } else if (tunnel->erspan_ver == 2) { |
716 | erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key), |
717 | direction: tunnel->dir, hwid: tunnel->hwid, |
718 | truncate, is_ipv4: true); |
719 | proto = htons(ETH_P_ERSPAN2); |
720 | } else { |
721 | goto free_skb; |
722 | } |
723 | |
724 | tunnel->parms.o_flags &= ~TUNNEL_KEY; |
725 | __gre_xmit(skb, dev, tnl_params: &tunnel->parms.iph, proto); |
726 | return NETDEV_TX_OK; |
727 | |
728 | free_skb: |
729 | kfree_skb(skb); |
730 | DEV_STATS_INC(dev, tx_dropped); |
731 | return NETDEV_TX_OK; |
732 | } |
733 | |
734 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
735 | struct net_device *dev) |
736 | { |
737 | struct ip_tunnel *tunnel = netdev_priv(dev); |
738 | |
739 | if (!pskb_inet_may_pull(skb)) |
740 | goto free_skb; |
741 | |
742 | if (tunnel->collect_md) { |
743 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
744 | return NETDEV_TX_OK; |
745 | } |
746 | |
747 | if (gre_handle_offloads(skb, csum: !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
748 | goto free_skb; |
749 | |
750 | if (skb_cow_head(skb, headroom: dev->needed_headroom)) |
751 | goto free_skb; |
752 | |
753 | __gre_xmit(skb, dev, tnl_params: &tunnel->parms.iph, htons(ETH_P_TEB)); |
754 | return NETDEV_TX_OK; |
755 | |
756 | free_skb: |
757 | kfree_skb(skb); |
758 | DEV_STATS_INC(dev, tx_dropped); |
759 | return NETDEV_TX_OK; |
760 | } |
761 | |
762 | static void ipgre_link_update(struct net_device *dev, bool set_mtu) |
763 | { |
764 | struct ip_tunnel *tunnel = netdev_priv(dev); |
765 | __be16 flags; |
766 | int len; |
767 | |
768 | len = tunnel->tun_hlen; |
769 | tunnel->tun_hlen = gre_calc_hlen(o_flags: tunnel->parms.o_flags); |
770 | len = tunnel->tun_hlen - len; |
771 | tunnel->hlen = tunnel->hlen + len; |
772 | |
773 | if (dev->header_ops) |
774 | dev->hard_header_len += len; |
775 | else |
776 | dev->needed_headroom += len; |
777 | |
778 | if (set_mtu) |
779 | dev->mtu = max_t(int, dev->mtu - len, 68); |
780 | |
781 | flags = tunnel->parms.o_flags; |
782 | |
783 | if (flags & TUNNEL_SEQ || |
784 | (flags & TUNNEL_CSUM && tunnel->encap.type != TUNNEL_ENCAP_NONE)) { |
785 | dev->features &= ~NETIF_F_GSO_SOFTWARE; |
786 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; |
787 | } else { |
788 | dev->features |= NETIF_F_GSO_SOFTWARE; |
789 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
790 | } |
791 | } |
792 | |
793 | static int ipgre_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, |
794 | int cmd) |
795 | { |
796 | int err; |
797 | |
798 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
799 | if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE || |
800 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) || |
801 | ((p->i_flags | p->o_flags) & (GRE_VERSION | GRE_ROUTING))) |
802 | return -EINVAL; |
803 | } |
804 | |
805 | p->i_flags = gre_flags_to_tnl_flags(flags: p->i_flags); |
806 | p->o_flags = gre_flags_to_tnl_flags(flags: p->o_flags); |
807 | |
808 | err = ip_tunnel_ctl(dev, p, cmd); |
809 | if (err) |
810 | return err; |
811 | |
812 | if (cmd == SIOCCHGTUNNEL) { |
813 | struct ip_tunnel *t = netdev_priv(dev); |
814 | |
815 | t->parms.i_flags = p->i_flags; |
816 | t->parms.o_flags = p->o_flags; |
817 | |
818 | if (strcmp(dev->rtnl_link_ops->kind, "erspan" )) |
819 | ipgre_link_update(dev, set_mtu: true); |
820 | } |
821 | |
822 | p->i_flags = gre_tnl_flags_to_gre_flags(tflags: p->i_flags); |
823 | p->o_flags = gre_tnl_flags_to_gre_flags(tflags: p->o_flags); |
824 | return 0; |
825 | } |
826 | |
827 | /* Nice toy. Unfortunately, useless in real life :-) |
828 | It allows to construct virtual multiprotocol broadcast "LAN" |
829 | over the Internet, provided multicast routing is tuned. |
830 | |
831 | |
832 | I have no idea was this bicycle invented before me, |
833 | so that I had to set ARPHRD_IPGRE to a random value. |
834 | I have an impression, that Cisco could make something similar, |
835 | but this feature is apparently missing in IOS<=11.2(8). |
836 | |
837 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
838 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
839 | |
840 | ping -t 255 224.66.66.66 |
841 | |
842 | If nobody answers, mbone does not work. |
843 | |
844 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
845 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
846 | ifconfig Universe up |
847 | ifconfig Universe add fe80::<Your_real_addr>/10 |
848 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
849 | ftp 10.66.66.66 |
850 | ... |
851 | ftp fec0:6666:6666::193.233.7.65 |
852 | ... |
853 | */ |
854 | static int (struct sk_buff *skb, struct net_device *dev, |
855 | unsigned short type, |
856 | const void *daddr, const void *saddr, unsigned int len) |
857 | { |
858 | struct ip_tunnel *t = netdev_priv(dev); |
859 | struct iphdr *iph; |
860 | struct gre_base_hdr *greh; |
861 | |
862 | iph = skb_push(skb, len: t->hlen + sizeof(*iph)); |
863 | greh = (struct gre_base_hdr *)(iph+1); |
864 | greh->flags = gre_tnl_flags_to_gre_flags(tflags: t->parms.o_flags); |
865 | greh->protocol = htons(type); |
866 | |
867 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
868 | |
869 | /* Set the source hardware address. */ |
870 | if (saddr) |
871 | memcpy(&iph->saddr, saddr, 4); |
872 | if (daddr) |
873 | memcpy(&iph->daddr, daddr, 4); |
874 | if (iph->daddr) |
875 | return t->hlen + sizeof(*iph); |
876 | |
877 | return -(t->hlen + sizeof(*iph)); |
878 | } |
879 | |
880 | static int (const struct sk_buff *skb, unsigned char *haddr) |
881 | { |
882 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
883 | memcpy(haddr, &iph->saddr, 4); |
884 | return 4; |
885 | } |
886 | |
887 | static const struct header_ops = { |
888 | .create = ipgre_header, |
889 | .parse = ipgre_header_parse, |
890 | }; |
891 | |
892 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
893 | static int ipgre_open(struct net_device *dev) |
894 | { |
895 | struct ip_tunnel *t = netdev_priv(dev); |
896 | |
897 | if (ipv4_is_multicast(addr: t->parms.iph.daddr)) { |
898 | struct flowi4 fl4; |
899 | struct rtable *rt; |
900 | |
901 | rt = ip_route_output_gre(net: t->net, fl4: &fl4, |
902 | daddr: t->parms.iph.daddr, |
903 | saddr: t->parms.iph.saddr, |
904 | gre_key: t->parms.o_key, |
905 | RT_TOS(t->parms.iph.tos), |
906 | oif: t->parms.link); |
907 | if (IS_ERR(ptr: rt)) |
908 | return -EADDRNOTAVAIL; |
909 | dev = rt->dst.dev; |
910 | ip_rt_put(rt); |
911 | if (!__in_dev_get_rtnl(dev)) |
912 | return -EADDRNOTAVAIL; |
913 | t->mlink = dev->ifindex; |
914 | ip_mc_inc_group(in_dev: __in_dev_get_rtnl(dev), addr: t->parms.iph.daddr); |
915 | } |
916 | return 0; |
917 | } |
918 | |
919 | static int ipgre_close(struct net_device *dev) |
920 | { |
921 | struct ip_tunnel *t = netdev_priv(dev); |
922 | |
923 | if (ipv4_is_multicast(addr: t->parms.iph.daddr) && t->mlink) { |
924 | struct in_device *in_dev; |
925 | in_dev = inetdev_by_index(t->net, t->mlink); |
926 | if (in_dev) |
927 | ip_mc_dec_group(in_dev, addr: t->parms.iph.daddr); |
928 | } |
929 | return 0; |
930 | } |
931 | #endif |
932 | |
933 | static const struct net_device_ops ipgre_netdev_ops = { |
934 | .ndo_init = ipgre_tunnel_init, |
935 | .ndo_uninit = ip_tunnel_uninit, |
936 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
937 | .ndo_open = ipgre_open, |
938 | .ndo_stop = ipgre_close, |
939 | #endif |
940 | .ndo_start_xmit = ipgre_xmit, |
941 | .ndo_siocdevprivate = ip_tunnel_siocdevprivate, |
942 | .ndo_change_mtu = ip_tunnel_change_mtu, |
943 | .ndo_get_stats64 = dev_get_tstats64, |
944 | .ndo_get_iflink = ip_tunnel_get_iflink, |
945 | .ndo_tunnel_ctl = ipgre_tunnel_ctl, |
946 | }; |
947 | |
948 | #define GRE_FEATURES (NETIF_F_SG | \ |
949 | NETIF_F_FRAGLIST | \ |
950 | NETIF_F_HIGHDMA | \ |
951 | NETIF_F_HW_CSUM) |
952 | |
953 | static void ipgre_tunnel_setup(struct net_device *dev) |
954 | { |
955 | dev->netdev_ops = &ipgre_netdev_ops; |
956 | dev->type = ARPHRD_IPGRE; |
957 | ip_tunnel_setup(dev, net_id: ipgre_net_id); |
958 | } |
959 | |
960 | static void __gre_tunnel_init(struct net_device *dev) |
961 | { |
962 | struct ip_tunnel *tunnel; |
963 | __be16 flags; |
964 | |
965 | tunnel = netdev_priv(dev); |
966 | tunnel->tun_hlen = gre_calc_hlen(o_flags: tunnel->parms.o_flags); |
967 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
968 | |
969 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
970 | dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph); |
971 | |
972 | dev->features |= GRE_FEATURES | NETIF_F_LLTX; |
973 | dev->hw_features |= GRE_FEATURES; |
974 | |
975 | flags = tunnel->parms.o_flags; |
976 | |
977 | /* TCP offload with GRE SEQ is not supported, nor can we support 2 |
978 | * levels of outer headers requiring an update. |
979 | */ |
980 | if (flags & TUNNEL_SEQ) |
981 | return; |
982 | if (flags & TUNNEL_CSUM && tunnel->encap.type != TUNNEL_ENCAP_NONE) |
983 | return; |
984 | |
985 | dev->features |= NETIF_F_GSO_SOFTWARE; |
986 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
987 | } |
988 | |
989 | static int ipgre_tunnel_init(struct net_device *dev) |
990 | { |
991 | struct ip_tunnel *tunnel = netdev_priv(dev); |
992 | struct iphdr *iph = &tunnel->parms.iph; |
993 | |
994 | __gre_tunnel_init(dev); |
995 | |
996 | __dev_addr_set(dev, addr: &iph->saddr, len: 4); |
997 | memcpy(dev->broadcast, &iph->daddr, 4); |
998 | |
999 | dev->flags = IFF_NOARP; |
1000 | netif_keep_dst(dev); |
1001 | dev->addr_len = 4; |
1002 | |
1003 | if (iph->daddr && !tunnel->collect_md) { |
1004 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1005 | if (ipv4_is_multicast(addr: iph->daddr)) { |
1006 | if (!iph->saddr) |
1007 | return -EINVAL; |
1008 | dev->flags = IFF_BROADCAST; |
1009 | dev->header_ops = &ipgre_header_ops; |
1010 | dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
1011 | dev->needed_headroom = 0; |
1012 | } |
1013 | #endif |
1014 | } else if (!tunnel->collect_md) { |
1015 | dev->header_ops = &ipgre_header_ops; |
1016 | dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
1017 | dev->needed_headroom = 0; |
1018 | } |
1019 | |
1020 | return ip_tunnel_init(dev); |
1021 | } |
1022 | |
1023 | static const struct gre_protocol ipgre_protocol = { |
1024 | .handler = gre_rcv, |
1025 | .err_handler = gre_err, |
1026 | }; |
1027 | |
1028 | static int __net_init ipgre_init_net(struct net *net) |
1029 | { |
1030 | return ip_tunnel_init_net(net, ip_tnl_net_id: ipgre_net_id, ops: &ipgre_link_ops, NULL); |
1031 | } |
1032 | |
1033 | static void __net_exit ipgre_exit_batch_rtnl(struct list_head *list_net, |
1034 | struct list_head *dev_to_kill) |
1035 | { |
1036 | ip_tunnel_delete_nets(list_net, id: ipgre_net_id, ops: &ipgre_link_ops, |
1037 | dev_to_kill); |
1038 | } |
1039 | |
1040 | static struct pernet_operations ipgre_net_ops = { |
1041 | .init = ipgre_init_net, |
1042 | .exit_batch_rtnl = ipgre_exit_batch_rtnl, |
1043 | .id = &ipgre_net_id, |
1044 | .size = sizeof(struct ip_tunnel_net), |
1045 | }; |
1046 | |
1047 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
1048 | struct netlink_ext_ack *extack) |
1049 | { |
1050 | __be16 flags; |
1051 | |
1052 | if (!data) |
1053 | return 0; |
1054 | |
1055 | flags = 0; |
1056 | if (data[IFLA_GRE_IFLAGS]) |
1057 | flags |= nla_get_be16(nla: data[IFLA_GRE_IFLAGS]); |
1058 | if (data[IFLA_GRE_OFLAGS]) |
1059 | flags |= nla_get_be16(nla: data[IFLA_GRE_OFLAGS]); |
1060 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
1061 | return -EINVAL; |
1062 | |
1063 | if (data[IFLA_GRE_COLLECT_METADATA] && |
1064 | data[IFLA_GRE_ENCAP_TYPE] && |
1065 | nla_get_u16(nla: data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) |
1066 | return -EINVAL; |
1067 | |
1068 | return 0; |
1069 | } |
1070 | |
1071 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1072 | struct netlink_ext_ack *extack) |
1073 | { |
1074 | __be32 daddr; |
1075 | |
1076 | if (tb[IFLA_ADDRESS]) { |
1077 | if (nla_len(nla: tb[IFLA_ADDRESS]) != ETH_ALEN) |
1078 | return -EINVAL; |
1079 | if (!is_valid_ether_addr(addr: nla_data(nla: tb[IFLA_ADDRESS]))) |
1080 | return -EADDRNOTAVAIL; |
1081 | } |
1082 | |
1083 | if (!data) |
1084 | goto out; |
1085 | |
1086 | if (data[IFLA_GRE_REMOTE]) { |
1087 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
1088 | if (!daddr) |
1089 | return -EINVAL; |
1090 | } |
1091 | |
1092 | out: |
1093 | return ipgre_tunnel_validate(tb, data, extack); |
1094 | } |
1095 | |
1096 | static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], |
1097 | struct netlink_ext_ack *extack) |
1098 | { |
1099 | __be16 flags = 0; |
1100 | int ret; |
1101 | |
1102 | if (!data) |
1103 | return 0; |
1104 | |
1105 | ret = ipgre_tap_validate(tb, data, extack); |
1106 | if (ret) |
1107 | return ret; |
1108 | |
1109 | if (data[IFLA_GRE_ERSPAN_VER] && |
1110 | nla_get_u8(nla: data[IFLA_GRE_ERSPAN_VER]) == 0) |
1111 | return 0; |
1112 | |
1113 | /* ERSPAN type II/III should only have GRE sequence and key flag */ |
1114 | if (data[IFLA_GRE_OFLAGS]) |
1115 | flags |= nla_get_be16(nla: data[IFLA_GRE_OFLAGS]); |
1116 | if (data[IFLA_GRE_IFLAGS]) |
1117 | flags |= nla_get_be16(nla: data[IFLA_GRE_IFLAGS]); |
1118 | if (!data[IFLA_GRE_COLLECT_METADATA] && |
1119 | flags != (GRE_SEQ | GRE_KEY)) |
1120 | return -EINVAL; |
1121 | |
1122 | /* ERSPAN Session ID only has 10-bit. Since we reuse |
1123 | * 32-bit key field as ID, check it's range. |
1124 | */ |
1125 | if (data[IFLA_GRE_IKEY] && |
1126 | (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) |
1127 | return -EINVAL; |
1128 | |
1129 | if (data[IFLA_GRE_OKEY] && |
1130 | (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) |
1131 | return -EINVAL; |
1132 | |
1133 | return 0; |
1134 | } |
1135 | |
1136 | static int ipgre_netlink_parms(struct net_device *dev, |
1137 | struct nlattr *data[], |
1138 | struct nlattr *tb[], |
1139 | struct ip_tunnel_parm *parms, |
1140 | __u32 *fwmark) |
1141 | { |
1142 | struct ip_tunnel *t = netdev_priv(dev); |
1143 | |
1144 | memset(parms, 0, sizeof(*parms)); |
1145 | |
1146 | parms->iph.protocol = IPPROTO_GRE; |
1147 | |
1148 | if (!data) |
1149 | return 0; |
1150 | |
1151 | if (data[IFLA_GRE_LINK]) |
1152 | parms->link = nla_get_u32(nla: data[IFLA_GRE_LINK]); |
1153 | |
1154 | if (data[IFLA_GRE_IFLAGS]) |
1155 | parms->i_flags = gre_flags_to_tnl_flags(flags: nla_get_be16(nla: data[IFLA_GRE_IFLAGS])); |
1156 | |
1157 | if (data[IFLA_GRE_OFLAGS]) |
1158 | parms->o_flags = gre_flags_to_tnl_flags(flags: nla_get_be16(nla: data[IFLA_GRE_OFLAGS])); |
1159 | |
1160 | if (data[IFLA_GRE_IKEY]) |
1161 | parms->i_key = nla_get_be32(nla: data[IFLA_GRE_IKEY]); |
1162 | |
1163 | if (data[IFLA_GRE_OKEY]) |
1164 | parms->o_key = nla_get_be32(nla: data[IFLA_GRE_OKEY]); |
1165 | |
1166 | if (data[IFLA_GRE_LOCAL]) |
1167 | parms->iph.saddr = nla_get_in_addr(nla: data[IFLA_GRE_LOCAL]); |
1168 | |
1169 | if (data[IFLA_GRE_REMOTE]) |
1170 | parms->iph.daddr = nla_get_in_addr(nla: data[IFLA_GRE_REMOTE]); |
1171 | |
1172 | if (data[IFLA_GRE_TTL]) |
1173 | parms->iph.ttl = nla_get_u8(nla: data[IFLA_GRE_TTL]); |
1174 | |
1175 | if (data[IFLA_GRE_TOS]) |
1176 | parms->iph.tos = nla_get_u8(nla: data[IFLA_GRE_TOS]); |
1177 | |
1178 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(nla: data[IFLA_GRE_PMTUDISC])) { |
1179 | if (t->ignore_df) |
1180 | return -EINVAL; |
1181 | parms->iph.frag_off = htons(IP_DF); |
1182 | } |
1183 | |
1184 | if (data[IFLA_GRE_COLLECT_METADATA]) { |
1185 | t->collect_md = true; |
1186 | if (dev->type == ARPHRD_IPGRE) |
1187 | dev->type = ARPHRD_NONE; |
1188 | } |
1189 | |
1190 | if (data[IFLA_GRE_IGNORE_DF]) { |
1191 | if (nla_get_u8(nla: data[IFLA_GRE_IGNORE_DF]) |
1192 | && (parms->iph.frag_off & htons(IP_DF))) |
1193 | return -EINVAL; |
1194 | t->ignore_df = !!nla_get_u8(nla: data[IFLA_GRE_IGNORE_DF]); |
1195 | } |
1196 | |
1197 | if (data[IFLA_GRE_FWMARK]) |
1198 | *fwmark = nla_get_u32(nla: data[IFLA_GRE_FWMARK]); |
1199 | |
1200 | return 0; |
1201 | } |
1202 | |
1203 | static int erspan_netlink_parms(struct net_device *dev, |
1204 | struct nlattr *data[], |
1205 | struct nlattr *tb[], |
1206 | struct ip_tunnel_parm *parms, |
1207 | __u32 *fwmark) |
1208 | { |
1209 | struct ip_tunnel *t = netdev_priv(dev); |
1210 | int err; |
1211 | |
1212 | err = ipgre_netlink_parms(dev, data, tb, parms, fwmark); |
1213 | if (err) |
1214 | return err; |
1215 | if (!data) |
1216 | return 0; |
1217 | |
1218 | if (data[IFLA_GRE_ERSPAN_VER]) { |
1219 | t->erspan_ver = nla_get_u8(nla: data[IFLA_GRE_ERSPAN_VER]); |
1220 | |
1221 | if (t->erspan_ver > 2) |
1222 | return -EINVAL; |
1223 | } |
1224 | |
1225 | if (t->erspan_ver == 1) { |
1226 | if (data[IFLA_GRE_ERSPAN_INDEX]) { |
1227 | t->index = nla_get_u32(nla: data[IFLA_GRE_ERSPAN_INDEX]); |
1228 | if (t->index & ~INDEX_MASK) |
1229 | return -EINVAL; |
1230 | } |
1231 | } else if (t->erspan_ver == 2) { |
1232 | if (data[IFLA_GRE_ERSPAN_DIR]) { |
1233 | t->dir = nla_get_u8(nla: data[IFLA_GRE_ERSPAN_DIR]); |
1234 | if (t->dir & ~(DIR_MASK >> DIR_OFFSET)) |
1235 | return -EINVAL; |
1236 | } |
1237 | if (data[IFLA_GRE_ERSPAN_HWID]) { |
1238 | t->hwid = nla_get_u16(nla: data[IFLA_GRE_ERSPAN_HWID]); |
1239 | if (t->hwid & ~(HWID_MASK >> HWID_OFFSET)) |
1240 | return -EINVAL; |
1241 | } |
1242 | } |
1243 | |
1244 | return 0; |
1245 | } |
1246 | |
1247 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1248 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], |
1249 | struct ip_tunnel_encap *ipencap) |
1250 | { |
1251 | bool ret = false; |
1252 | |
1253 | memset(ipencap, 0, sizeof(*ipencap)); |
1254 | |
1255 | if (!data) |
1256 | return ret; |
1257 | |
1258 | if (data[IFLA_GRE_ENCAP_TYPE]) { |
1259 | ret = true; |
1260 | ipencap->type = nla_get_u16(nla: data[IFLA_GRE_ENCAP_TYPE]); |
1261 | } |
1262 | |
1263 | if (data[IFLA_GRE_ENCAP_FLAGS]) { |
1264 | ret = true; |
1265 | ipencap->flags = nla_get_u16(nla: data[IFLA_GRE_ENCAP_FLAGS]); |
1266 | } |
1267 | |
1268 | if (data[IFLA_GRE_ENCAP_SPORT]) { |
1269 | ret = true; |
1270 | ipencap->sport = nla_get_be16(nla: data[IFLA_GRE_ENCAP_SPORT]); |
1271 | } |
1272 | |
1273 | if (data[IFLA_GRE_ENCAP_DPORT]) { |
1274 | ret = true; |
1275 | ipencap->dport = nla_get_be16(nla: data[IFLA_GRE_ENCAP_DPORT]); |
1276 | } |
1277 | |
1278 | return ret; |
1279 | } |
1280 | |
1281 | static int gre_tap_init(struct net_device *dev) |
1282 | { |
1283 | __gre_tunnel_init(dev); |
1284 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1285 | netif_keep_dst(dev); |
1286 | |
1287 | return ip_tunnel_init(dev); |
1288 | } |
1289 | |
1290 | static const struct net_device_ops gre_tap_netdev_ops = { |
1291 | .ndo_init = gre_tap_init, |
1292 | .ndo_uninit = ip_tunnel_uninit, |
1293 | .ndo_start_xmit = gre_tap_xmit, |
1294 | .ndo_set_mac_address = eth_mac_addr, |
1295 | .ndo_validate_addr = eth_validate_addr, |
1296 | .ndo_change_mtu = ip_tunnel_change_mtu, |
1297 | .ndo_get_stats64 = dev_get_tstats64, |
1298 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1299 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
1300 | }; |
1301 | |
1302 | static int erspan_tunnel_init(struct net_device *dev) |
1303 | { |
1304 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1305 | |
1306 | if (tunnel->erspan_ver == 0) |
1307 | tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */ |
1308 | else |
1309 | tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */ |
1310 | |
1311 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
1312 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
1313 | erspan_hdr_len(version: tunnel->erspan_ver); |
1314 | |
1315 | dev->features |= GRE_FEATURES; |
1316 | dev->hw_features |= GRE_FEATURES; |
1317 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1318 | netif_keep_dst(dev); |
1319 | |
1320 | return ip_tunnel_init(dev); |
1321 | } |
1322 | |
1323 | static const struct net_device_ops erspan_netdev_ops = { |
1324 | .ndo_init = erspan_tunnel_init, |
1325 | .ndo_uninit = ip_tunnel_uninit, |
1326 | .ndo_start_xmit = erspan_xmit, |
1327 | .ndo_set_mac_address = eth_mac_addr, |
1328 | .ndo_validate_addr = eth_validate_addr, |
1329 | .ndo_change_mtu = ip_tunnel_change_mtu, |
1330 | .ndo_get_stats64 = dev_get_tstats64, |
1331 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1332 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
1333 | }; |
1334 | |
1335 | static void ipgre_tap_setup(struct net_device *dev) |
1336 | { |
1337 | ether_setup(dev); |
1338 | dev->max_mtu = 0; |
1339 | dev->netdev_ops = &gre_tap_netdev_ops; |
1340 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
1341 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1342 | ip_tunnel_setup(dev, net_id: gre_tap_net_id); |
1343 | } |
1344 | |
1345 | static int |
1346 | ipgre_newlink_encap_setup(struct net_device *dev, struct nlattr *data[]) |
1347 | { |
1348 | struct ip_tunnel_encap ipencap; |
1349 | |
1350 | if (ipgre_netlink_encap_parms(data, ipencap: &ipencap)) { |
1351 | struct ip_tunnel *t = netdev_priv(dev); |
1352 | int err = ip_tunnel_encap_setup(t, ipencap: &ipencap); |
1353 | |
1354 | if (err < 0) |
1355 | return err; |
1356 | } |
1357 | |
1358 | return 0; |
1359 | } |
1360 | |
1361 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
1362 | struct nlattr *tb[], struct nlattr *data[], |
1363 | struct netlink_ext_ack *extack) |
1364 | { |
1365 | struct ip_tunnel_parm p; |
1366 | __u32 fwmark = 0; |
1367 | int err; |
1368 | |
1369 | err = ipgre_newlink_encap_setup(dev, data); |
1370 | if (err) |
1371 | return err; |
1372 | |
1373 | err = ipgre_netlink_parms(dev, data, tb, parms: &p, fwmark: &fwmark); |
1374 | if (err < 0) |
1375 | return err; |
1376 | return ip_tunnel_newlink(dev, tb, p: &p, fwmark); |
1377 | } |
1378 | |
1379 | static int erspan_newlink(struct net *src_net, struct net_device *dev, |
1380 | struct nlattr *tb[], struct nlattr *data[], |
1381 | struct netlink_ext_ack *extack) |
1382 | { |
1383 | struct ip_tunnel_parm p; |
1384 | __u32 fwmark = 0; |
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, parms: &p, fwmark: &fwmark); |
1392 | if (err) |
1393 | return err; |
1394 | return ip_tunnel_newlink(dev, tb, p: &p, fwmark); |
1395 | } |
1396 | |
1397 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
1398 | struct nlattr *data[], |
1399 | struct netlink_ext_ack *extack) |
1400 | { |
1401 | struct ip_tunnel *t = netdev_priv(dev); |
1402 | __u32 fwmark = t->fwmark; |
1403 | struct ip_tunnel_parm p; |
1404 | int err; |
1405 | |
1406 | err = ipgre_newlink_encap_setup(dev, data); |
1407 | if (err) |
1408 | return err; |
1409 | |
1410 | err = ipgre_netlink_parms(dev, data, tb, parms: &p, fwmark: &fwmark); |
1411 | if (err < 0) |
1412 | return err; |
1413 | |
1414 | err = ip_tunnel_changelink(dev, tb, p: &p, fwmark); |
1415 | if (err < 0) |
1416 | return err; |
1417 | |
1418 | t->parms.i_flags = p.i_flags; |
1419 | t->parms.o_flags = p.o_flags; |
1420 | |
1421 | ipgre_link_update(dev, set_mtu: !tb[IFLA_MTU]); |
1422 | |
1423 | return 0; |
1424 | } |
1425 | |
1426 | static int erspan_changelink(struct net_device *dev, struct nlattr *tb[], |
1427 | struct nlattr *data[], |
1428 | struct netlink_ext_ack *extack) |
1429 | { |
1430 | struct ip_tunnel *t = netdev_priv(dev); |
1431 | __u32 fwmark = t->fwmark; |
1432 | struct ip_tunnel_parm p; |
1433 | int err; |
1434 | |
1435 | err = ipgre_newlink_encap_setup(dev, data); |
1436 | if (err) |
1437 | return err; |
1438 | |
1439 | err = erspan_netlink_parms(dev, data, tb, parms: &p, fwmark: &fwmark); |
1440 | if (err < 0) |
1441 | return err; |
1442 | |
1443 | err = ip_tunnel_changelink(dev, tb, p: &p, fwmark); |
1444 | if (err < 0) |
1445 | return err; |
1446 | |
1447 | t->parms.i_flags = p.i_flags; |
1448 | t->parms.o_flags = p.o_flags; |
1449 | |
1450 | return 0; |
1451 | } |
1452 | |
1453 | static size_t ipgre_get_size(const struct net_device *dev) |
1454 | { |
1455 | return |
1456 | /* IFLA_GRE_LINK */ |
1457 | nla_total_size(payload: 4) + |
1458 | /* IFLA_GRE_IFLAGS */ |
1459 | nla_total_size(payload: 2) + |
1460 | /* IFLA_GRE_OFLAGS */ |
1461 | nla_total_size(payload: 2) + |
1462 | /* IFLA_GRE_IKEY */ |
1463 | nla_total_size(payload: 4) + |
1464 | /* IFLA_GRE_OKEY */ |
1465 | nla_total_size(payload: 4) + |
1466 | /* IFLA_GRE_LOCAL */ |
1467 | nla_total_size(payload: 4) + |
1468 | /* IFLA_GRE_REMOTE */ |
1469 | nla_total_size(payload: 4) + |
1470 | /* IFLA_GRE_TTL */ |
1471 | nla_total_size(payload: 1) + |
1472 | /* IFLA_GRE_TOS */ |
1473 | nla_total_size(payload: 1) + |
1474 | /* IFLA_GRE_PMTUDISC */ |
1475 | nla_total_size(payload: 1) + |
1476 | /* IFLA_GRE_ENCAP_TYPE */ |
1477 | nla_total_size(payload: 2) + |
1478 | /* IFLA_GRE_ENCAP_FLAGS */ |
1479 | nla_total_size(payload: 2) + |
1480 | /* IFLA_GRE_ENCAP_SPORT */ |
1481 | nla_total_size(payload: 2) + |
1482 | /* IFLA_GRE_ENCAP_DPORT */ |
1483 | nla_total_size(payload: 2) + |
1484 | /* IFLA_GRE_COLLECT_METADATA */ |
1485 | nla_total_size(payload: 0) + |
1486 | /* IFLA_GRE_IGNORE_DF */ |
1487 | nla_total_size(payload: 1) + |
1488 | /* IFLA_GRE_FWMARK */ |
1489 | nla_total_size(payload: 4) + |
1490 | /* IFLA_GRE_ERSPAN_INDEX */ |
1491 | nla_total_size(payload: 4) + |
1492 | /* IFLA_GRE_ERSPAN_VER */ |
1493 | nla_total_size(payload: 1) + |
1494 | /* IFLA_GRE_ERSPAN_DIR */ |
1495 | nla_total_size(payload: 1) + |
1496 | /* IFLA_GRE_ERSPAN_HWID */ |
1497 | nla_total_size(payload: 2) + |
1498 | 0; |
1499 | } |
1500 | |
1501 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
1502 | { |
1503 | struct ip_tunnel *t = netdev_priv(dev); |
1504 | struct ip_tunnel_parm *p = &t->parms; |
1505 | __be16 o_flags = p->o_flags; |
1506 | |
1507 | if (nla_put_u32(skb, attrtype: IFLA_GRE_LINK, value: p->link) || |
1508 | nla_put_be16(skb, attrtype: IFLA_GRE_IFLAGS, |
1509 | value: gre_tnl_flags_to_gre_flags(tflags: p->i_flags)) || |
1510 | nla_put_be16(skb, attrtype: IFLA_GRE_OFLAGS, |
1511 | value: gre_tnl_flags_to_gre_flags(tflags: o_flags)) || |
1512 | nla_put_be32(skb, attrtype: IFLA_GRE_IKEY, value: p->i_key) || |
1513 | nla_put_be32(skb, attrtype: IFLA_GRE_OKEY, value: p->o_key) || |
1514 | nla_put_in_addr(skb, attrtype: IFLA_GRE_LOCAL, addr: p->iph.saddr) || |
1515 | nla_put_in_addr(skb, attrtype: IFLA_GRE_REMOTE, addr: p->iph.daddr) || |
1516 | nla_put_u8(skb, attrtype: IFLA_GRE_TTL, value: p->iph.ttl) || |
1517 | nla_put_u8(skb, attrtype: IFLA_GRE_TOS, value: p->iph.tos) || |
1518 | nla_put_u8(skb, attrtype: IFLA_GRE_PMTUDISC, |
1519 | value: !!(p->iph.frag_off & htons(IP_DF))) || |
1520 | nla_put_u32(skb, attrtype: IFLA_GRE_FWMARK, value: t->fwmark)) |
1521 | goto nla_put_failure; |
1522 | |
1523 | if (nla_put_u16(skb, attrtype: IFLA_GRE_ENCAP_TYPE, |
1524 | value: t->encap.type) || |
1525 | nla_put_be16(skb, attrtype: IFLA_GRE_ENCAP_SPORT, |
1526 | value: t->encap.sport) || |
1527 | nla_put_be16(skb, attrtype: IFLA_GRE_ENCAP_DPORT, |
1528 | value: t->encap.dport) || |
1529 | nla_put_u16(skb, attrtype: IFLA_GRE_ENCAP_FLAGS, |
1530 | value: t->encap.flags)) |
1531 | goto nla_put_failure; |
1532 | |
1533 | if (nla_put_u8(skb, attrtype: IFLA_GRE_IGNORE_DF, value: t->ignore_df)) |
1534 | goto nla_put_failure; |
1535 | |
1536 | if (t->collect_md) { |
1537 | if (nla_put_flag(skb, attrtype: IFLA_GRE_COLLECT_METADATA)) |
1538 | goto nla_put_failure; |
1539 | } |
1540 | |
1541 | return 0; |
1542 | |
1543 | nla_put_failure: |
1544 | return -EMSGSIZE; |
1545 | } |
1546 | |
1547 | static int erspan_fill_info(struct sk_buff *skb, const struct net_device *dev) |
1548 | { |
1549 | struct ip_tunnel *t = netdev_priv(dev); |
1550 | |
1551 | if (t->erspan_ver <= 2) { |
1552 | if (t->erspan_ver != 0 && !t->collect_md) |
1553 | t->parms.o_flags |= TUNNEL_KEY; |
1554 | |
1555 | if (nla_put_u8(skb, attrtype: IFLA_GRE_ERSPAN_VER, value: t->erspan_ver)) |
1556 | goto nla_put_failure; |
1557 | |
1558 | if (t->erspan_ver == 1) { |
1559 | if (nla_put_u32(skb, attrtype: IFLA_GRE_ERSPAN_INDEX, value: t->index)) |
1560 | goto nla_put_failure; |
1561 | } else if (t->erspan_ver == 2) { |
1562 | if (nla_put_u8(skb, attrtype: IFLA_GRE_ERSPAN_DIR, value: t->dir)) |
1563 | goto nla_put_failure; |
1564 | if (nla_put_u16(skb, attrtype: IFLA_GRE_ERSPAN_HWID, value: t->hwid)) |
1565 | goto nla_put_failure; |
1566 | } |
1567 | } |
1568 | |
1569 | return ipgre_fill_info(skb, dev); |
1570 | |
1571 | nla_put_failure: |
1572 | return -EMSGSIZE; |
1573 | } |
1574 | |
1575 | static void erspan_setup(struct net_device *dev) |
1576 | { |
1577 | struct ip_tunnel *t = netdev_priv(dev); |
1578 | |
1579 | ether_setup(dev); |
1580 | dev->max_mtu = 0; |
1581 | dev->netdev_ops = &erspan_netdev_ops; |
1582 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
1583 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1584 | ip_tunnel_setup(dev, net_id: erspan_net_id); |
1585 | t->erspan_ver = 1; |
1586 | } |
1587 | |
1588 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
1589 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
1590 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
1591 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
1592 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
1593 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
1594 | [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, |
1595 | [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, |
1596 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1597 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
1598 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
1599 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1600 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, |
1601 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, |
1602 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, |
1603 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
1604 | [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, |
1605 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
1606 | [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
1607 | [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
1608 | [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, |
1609 | [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, |
1610 | }; |
1611 | |
1612 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
1613 | .kind = "gre" , |
1614 | .maxtype = IFLA_GRE_MAX, |
1615 | .policy = ipgre_policy, |
1616 | .priv_size = sizeof(struct ip_tunnel), |
1617 | .setup = ipgre_tunnel_setup, |
1618 | .validate = ipgre_tunnel_validate, |
1619 | .newlink = ipgre_newlink, |
1620 | .changelink = ipgre_changelink, |
1621 | .dellink = ip_tunnel_dellink, |
1622 | .get_size = ipgre_get_size, |
1623 | .fill_info = ipgre_fill_info, |
1624 | .get_link_net = ip_tunnel_get_link_net, |
1625 | }; |
1626 | |
1627 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1628 | .kind = "gretap" , |
1629 | .maxtype = IFLA_GRE_MAX, |
1630 | .policy = ipgre_policy, |
1631 | .priv_size = sizeof(struct ip_tunnel), |
1632 | .setup = ipgre_tap_setup, |
1633 | .validate = ipgre_tap_validate, |
1634 | .newlink = ipgre_newlink, |
1635 | .changelink = ipgre_changelink, |
1636 | .dellink = ip_tunnel_dellink, |
1637 | .get_size = ipgre_get_size, |
1638 | .fill_info = ipgre_fill_info, |
1639 | .get_link_net = ip_tunnel_get_link_net, |
1640 | }; |
1641 | |
1642 | static struct rtnl_link_ops erspan_link_ops __read_mostly = { |
1643 | .kind = "erspan" , |
1644 | .maxtype = IFLA_GRE_MAX, |
1645 | .policy = ipgre_policy, |
1646 | .priv_size = sizeof(struct ip_tunnel), |
1647 | .setup = erspan_setup, |
1648 | .validate = erspan_validate, |
1649 | .newlink = erspan_newlink, |
1650 | .changelink = erspan_changelink, |
1651 | .dellink = ip_tunnel_dellink, |
1652 | .get_size = ipgre_get_size, |
1653 | .fill_info = erspan_fill_info, |
1654 | .get_link_net = ip_tunnel_get_link_net, |
1655 | }; |
1656 | |
1657 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1658 | u8 name_assign_type) |
1659 | { |
1660 | struct nlattr *tb[IFLA_MAX + 1]; |
1661 | struct net_device *dev; |
1662 | LIST_HEAD(list_kill); |
1663 | struct ip_tunnel *t; |
1664 | int err; |
1665 | |
1666 | memset(&tb, 0, sizeof(tb)); |
1667 | |
1668 | dev = rtnl_create_link(net, ifname: name, name_assign_type, |
1669 | ops: &ipgre_tap_ops, tb, NULL); |
1670 | if (IS_ERR(ptr: dev)) |
1671 | return dev; |
1672 | |
1673 | /* Configure flow based GRE device. */ |
1674 | t = netdev_priv(dev); |
1675 | t->collect_md = true; |
1676 | |
1677 | err = ipgre_newlink(src_net: net, dev, tb, NULL, NULL); |
1678 | if (err < 0) { |
1679 | free_netdev(dev); |
1680 | return ERR_PTR(error: err); |
1681 | } |
1682 | |
1683 | /* openvswitch users expect packet sizes to be unrestricted, |
1684 | * so set the largest MTU we can. |
1685 | */ |
1686 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, strict: false); |
1687 | if (err) |
1688 | goto out; |
1689 | |
1690 | err = rtnl_configure_link(dev, NULL, portid: 0, NULL); |
1691 | if (err < 0) |
1692 | goto out; |
1693 | |
1694 | return dev; |
1695 | out: |
1696 | ip_tunnel_dellink(dev, head: &list_kill); |
1697 | unregister_netdevice_many(head: &list_kill); |
1698 | return ERR_PTR(error: err); |
1699 | } |
1700 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); |
1701 | |
1702 | static int __net_init ipgre_tap_init_net(struct net *net) |
1703 | { |
1704 | return ip_tunnel_init_net(net, ip_tnl_net_id: gre_tap_net_id, ops: &ipgre_tap_ops, devname: "gretap0" ); |
1705 | } |
1706 | |
1707 | static void __net_exit ipgre_tap_exit_batch_rtnl(struct list_head *list_net, |
1708 | struct list_head *dev_to_kill) |
1709 | { |
1710 | ip_tunnel_delete_nets(list_net, id: gre_tap_net_id, ops: &ipgre_tap_ops, |
1711 | dev_to_kill); |
1712 | } |
1713 | |
1714 | static struct pernet_operations ipgre_tap_net_ops = { |
1715 | .init = ipgre_tap_init_net, |
1716 | .exit_batch_rtnl = ipgre_tap_exit_batch_rtnl, |
1717 | .id = &gre_tap_net_id, |
1718 | .size = sizeof(struct ip_tunnel_net), |
1719 | }; |
1720 | |
1721 | static int __net_init erspan_init_net(struct net *net) |
1722 | { |
1723 | return ip_tunnel_init_net(net, ip_tnl_net_id: erspan_net_id, |
1724 | ops: &erspan_link_ops, devname: "erspan0" ); |
1725 | } |
1726 | |
1727 | static void __net_exit erspan_exit_batch_rtnl(struct list_head *net_list, |
1728 | struct list_head *dev_to_kill) |
1729 | { |
1730 | ip_tunnel_delete_nets(list_net: net_list, id: erspan_net_id, ops: &erspan_link_ops, |
1731 | dev_to_kill); |
1732 | } |
1733 | |
1734 | static struct pernet_operations erspan_net_ops = { |
1735 | .init = erspan_init_net, |
1736 | .exit_batch_rtnl = erspan_exit_batch_rtnl, |
1737 | .id = &erspan_net_id, |
1738 | .size = sizeof(struct ip_tunnel_net), |
1739 | }; |
1740 | |
1741 | static int __init ipgre_init(void) |
1742 | { |
1743 | int err; |
1744 | |
1745 | pr_info("GRE over IPv4 tunneling driver\n" ); |
1746 | |
1747 | err = register_pernet_device(&ipgre_net_ops); |
1748 | if (err < 0) |
1749 | return err; |
1750 | |
1751 | err = register_pernet_device(&ipgre_tap_net_ops); |
1752 | if (err < 0) |
1753 | goto pnet_tap_failed; |
1754 | |
1755 | err = register_pernet_device(&erspan_net_ops); |
1756 | if (err < 0) |
1757 | goto pnet_erspan_failed; |
1758 | |
1759 | err = gre_add_protocol(proto: &ipgre_protocol, GREPROTO_CISCO); |
1760 | if (err < 0) { |
1761 | pr_info("%s: can't add protocol\n" , __func__); |
1762 | goto add_proto_failed; |
1763 | } |
1764 | |
1765 | err = rtnl_link_register(ops: &ipgre_link_ops); |
1766 | if (err < 0) |
1767 | goto rtnl_link_failed; |
1768 | |
1769 | err = rtnl_link_register(ops: &ipgre_tap_ops); |
1770 | if (err < 0) |
1771 | goto tap_ops_failed; |
1772 | |
1773 | err = rtnl_link_register(ops: &erspan_link_ops); |
1774 | if (err < 0) |
1775 | goto erspan_link_failed; |
1776 | |
1777 | return 0; |
1778 | |
1779 | erspan_link_failed: |
1780 | rtnl_link_unregister(ops: &ipgre_tap_ops); |
1781 | tap_ops_failed: |
1782 | rtnl_link_unregister(ops: &ipgre_link_ops); |
1783 | rtnl_link_failed: |
1784 | gre_del_protocol(proto: &ipgre_protocol, GREPROTO_CISCO); |
1785 | add_proto_failed: |
1786 | unregister_pernet_device(&erspan_net_ops); |
1787 | pnet_erspan_failed: |
1788 | unregister_pernet_device(&ipgre_tap_net_ops); |
1789 | pnet_tap_failed: |
1790 | unregister_pernet_device(&ipgre_net_ops); |
1791 | return err; |
1792 | } |
1793 | |
1794 | static void __exit ipgre_fini(void) |
1795 | { |
1796 | rtnl_link_unregister(ops: &ipgre_tap_ops); |
1797 | rtnl_link_unregister(ops: &ipgre_link_ops); |
1798 | rtnl_link_unregister(ops: &erspan_link_ops); |
1799 | gre_del_protocol(proto: &ipgre_protocol, GREPROTO_CISCO); |
1800 | unregister_pernet_device(&ipgre_tap_net_ops); |
1801 | unregister_pernet_device(&ipgre_net_ops); |
1802 | unregister_pernet_device(&erspan_net_ops); |
1803 | } |
1804 | |
1805 | module_init(ipgre_init); |
1806 | module_exit(ipgre_fini); |
1807 | MODULE_DESCRIPTION("IPv4 GRE tunnels over IP library" ); |
1808 | MODULE_LICENSE("GPL" ); |
1809 | MODULE_ALIAS_RTNL_LINK("gre" ); |
1810 | MODULE_ALIAS_RTNL_LINK("gretap" ); |
1811 | MODULE_ALIAS_RTNL_LINK("erspan" ); |
1812 | MODULE_ALIAS_NETDEV("gre0" ); |
1813 | MODULE_ALIAS_NETDEV("gretap0" ); |
1814 | MODULE_ALIAS_NETDEV("erspan0" ); |
1815 | |