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/flow.h>
32 #include <net/sock.h>
33 #include <net/ip.h>
34 #include <net/icmp.h>
35 #include <net/protocol.h>
36 #include <net/ip_tunnels.h>
37 #include <net/arp.h>
38 #include <net/checksum.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/xfrm.h>
42 #include <net/net_namespace.h>
43 #include <net/netns/generic.h>
44 #include <net/rtnetlink.h>
45 #include <net/gre.h>
46 #include <net/dst_metadata.h>
47 #include <net/erspan.h>
48
49 /*
50 Problems & solutions
51 --------------------
52
53 1. The most important issue is detecting local dead loops.
54 They would cause complete host lockup in transmit, which
55 would be "resolved" by stack overflow or, if queueing is enabled,
56 with infinite looping in net_bh.
57
58 We cannot track such dead loops during route installation,
59 it is infeasible task. The most general solutions would be
60 to keep skb->encapsulation counter (sort of local ttl),
61 and silently drop packet when it expires. It is a good
62 solution, but it supposes maintaining new variable in ALL
63 skb, even if no tunneling is used.
64
65 Current solution: xmit_recursion breaks dead loops. This is a percpu
66 counter, since when we enter the first ndo_xmit(), cpu migration is
67 forbidden. We force an exit if this counter reaches RECURSION_LIMIT
68
69 2. Networking dead loops would not kill routers, but would really
70 kill network. IP hop limit plays role of "t->recursion" in this case,
71 if we copy it from packet being encapsulated to upper header.
72 It is very good solution, but it introduces two problems:
73
74 - Routing protocols, using packets with ttl=1 (OSPF, RIP2),
75 do not work over tunnels.
76 - traceroute does not work. I planned to relay ICMP from tunnel,
77 so that this problem would be solved and traceroute output
78 would even more informative. This idea appeared to be wrong:
79 only Linux complies to rfc1812 now (yes, guys, Linux is the only
80 true router now :-)), all routers (at least, in neighbourhood of mine)
81 return only 8 bytes of payload. It is the end.
82
83 Hence, if we want that OSPF worked or traceroute said something reasonable,
84 we should search for another solution.
85
86 One of them is to parse packet trying to detect inner encapsulation
87 made by our node. It is difficult or even impossible, especially,
88 taking into account fragmentation. TO be short, ttl is not solution at all.
89
90 Current solution: The solution was UNEXPECTEDLY SIMPLE.
91 We force DF flag on tunnels with preconfigured hop limit,
92 that is ALL. :-) Well, it does not remove the problem completely,
93 but exponential growth of network traffic is changed to linear
94 (branches, that exceed pmtu are pruned) and tunnel mtu
95 rapidly degrades to value <68, where looping stops.
96 Yes, it is not good if there exists a router in the loop,
97 which does not force DF, even when encapsulating packets have DF set.
98 But it is not our problem! Nobody could accuse us, we made
99 all that we could make. Even if it is your gated who injected
100 fatal route to network, even if it were you who configured
101 fatal static route: you are innocent. :-)
102
103 Alexey Kuznetsov.
104 */
105
106 static bool log_ecn_error = true;
107 module_param(log_ecn_error, bool, 0644);
108 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
109
110 static struct rtnl_link_ops ipgre_link_ops __read_mostly;
111 static const struct header_ops ipgre_header_ops;
112
113 static int ipgre_tunnel_init(struct net_device *dev);
114 static void erspan_build_header(struct sk_buff *skb,
115 u32 id, u32 index,
116 bool truncate, bool is_ipv4);
117
118 static unsigned int ipgre_net_id __read_mostly;
119 static unsigned int gre_tap_net_id __read_mostly;
120 static unsigned int erspan_net_id __read_mostly;
121
ipgre_err(struct sk_buff * skb,u32 info,const struct tnl_ptk_info * tpi)122 static int ipgre_err(struct sk_buff *skb, u32 info,
123 const struct tnl_ptk_info *tpi)
124 {
125
126 /* All the routers (except for Linux) return only
127 8 bytes of packet payload. It means, that precise relaying of
128 ICMP in the real Internet is absolutely infeasible.
129
130 Moreover, Cisco "wise men" put GRE key to the third word
131 in GRE header. It makes impossible maintaining even soft
132 state for keyed GRE tunnels with enabled checksum. Tell
133 them "thank you".
134
135 Well, I wonder, rfc1812 was written by Cisco employee,
136 what the hell these idiots break standards established
137 by themselves???
138 */
139 struct net *net = dev_net(skb->dev);
140 struct ip_tunnel_net *itn;
141 const struct iphdr *iph;
142 const int type = icmp_hdr(skb)->type;
143 const int code = icmp_hdr(skb)->code;
144 struct ip_tunnel *t;
145
146 if (tpi->proto == htons(ETH_P_TEB))
147 itn = net_generic(net, 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, erspan_net_id);
151 else
152 itn = net_generic(net, ipgre_net_id);
153
154 iph = (const struct iphdr *)(icmp_hdr(skb) + 1);
155 t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
156 iph->daddr, iph->saddr, 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 break;
185
186 case ICMP_REDIRECT:
187 break;
188 }
189
190 #if IS_ENABLED(CONFIG_IPV6)
191 if (tpi->proto == htons(ETH_P_IPV6)) {
192 unsigned int data_len = 0;
193
194 if (type == ICMP_TIME_EXCEEDED)
195 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
196
197 if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len,
198 type, data_len))
199 return 0;
200 }
201 #endif
202
203 if (t->parms.iph.daddr == 0 ||
204 ipv4_is_multicast(t->parms.iph.daddr))
205 return 0;
206
207 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
208 return 0;
209
210 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
211 t->err_count++;
212 else
213 t->err_count = 1;
214 t->err_time = jiffies;
215
216 return 0;
217 }
218
gre_err(struct sk_buff * skb,u32 info)219 static void gre_err(struct sk_buff *skb, u32 info)
220 {
221 /* All the routers (except for Linux) return only
222 * 8 bytes of packet payload. It means, that precise relaying of
223 * ICMP in the real Internet is absolutely infeasible.
224 *
225 * Moreover, Cisco "wise men" put GRE key to the third word
226 * in GRE header. It makes impossible maintaining even soft
227 * state for keyed
228 * GRE tunnels with enabled checksum. Tell them "thank you".
229 *
230 * Well, I wonder, rfc1812 was written by Cisco employee,
231 * what the hell these idiots break standards established
232 * by themselves???
233 */
234
235 const struct iphdr *iph = (struct iphdr *)skb->data;
236 const int type = icmp_hdr(skb)->type;
237 const int code = icmp_hdr(skb)->code;
238 struct tnl_ptk_info tpi;
239
240 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IP),
241 iph->ihl * 4) < 0)
242 return;
243
244 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
245 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
246 skb->dev->ifindex, IPPROTO_GRE);
247 return;
248 }
249 if (type == ICMP_REDIRECT) {
250 ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex,
251 IPPROTO_GRE);
252 return;
253 }
254
255 ipgre_err(skb, info, &tpi);
256 }
257
is_erspan_type1(int gre_hdr_len)258 static bool is_erspan_type1(int gre_hdr_len)
259 {
260 /* Both ERSPAN type I (version 0) and type II (version 1) use
261 * protocol 0x88BE, but the type I has only 4-byte GRE header,
262 * while type II has 8-byte.
263 */
264 return gre_hdr_len == 4;
265 }
266
erspan_rcv(struct sk_buff * skb,struct tnl_ptk_info * tpi,int gre_hdr_len)267 static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
268 int gre_hdr_len)
269 {
270 struct net *net = dev_net(skb->dev);
271 struct metadata_dst *tun_dst = NULL;
272 struct erspan_base_hdr *ershdr;
273 IP_TUNNEL_DECLARE_FLAGS(flags);
274 struct ip_tunnel_net *itn;
275 struct ip_tunnel *tunnel;
276 const struct iphdr *iph;
277 struct erspan_md2 *md2;
278 int ver;
279 int len;
280
281 ip_tunnel_flags_copy(flags, tpi->flags);
282
283 itn = net_generic(net, erspan_net_id);
284 iph = ip_hdr(skb);
285 if (is_erspan_type1(gre_hdr_len)) {
286 ver = 0;
287 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags);
288 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags,
289 iph->saddr, iph->daddr, 0);
290 } else {
291 if (unlikely(!pskb_may_pull(skb,
292 gre_hdr_len + sizeof(*ershdr))))
293 return PACKET_REJECT;
294
295 ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);
296 ver = ershdr->ver;
297 iph = ip_hdr(skb);
298 __set_bit(IP_TUNNEL_KEY_BIT, flags);
299 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags,
300 iph->saddr, iph->daddr, tpi->key);
301 }
302
303 if (tunnel) {
304 if (is_erspan_type1(gre_hdr_len))
305 len = gre_hdr_len;
306 else
307 len = gre_hdr_len + erspan_hdr_len(ver);
308
309 if (unlikely(!pskb_may_pull(skb, len)))
310 return PACKET_REJECT;
311
312 if (__iptunnel_pull_header(skb,
313 len,
314 htons(ETH_P_TEB),
315 false, false) < 0)
316 goto drop;
317
318 if (tunnel->collect_md) {
319 struct erspan_metadata *pkt_md, *md;
320 struct ip_tunnel_info *info;
321 unsigned char *gh;
322 __be64 tun_id;
323
324 __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
325 ip_tunnel_flags_copy(flags, tpi->flags);
326 tun_id = key32_to_tunnel_id(tpi->key);
327
328 tun_dst = ip_tun_rx_dst(skb, flags,
329 tun_id, sizeof(*md));
330 if (!tun_dst)
331 return PACKET_REJECT;
332
333 /* MUST set options_len before referencing options */
334 info = &tun_dst->u.tun_info;
335 info->options_len = sizeof(*md);
336
337 /* skb can be uncloned in __iptunnel_pull_header, so
338 * old pkt_md is no longer valid and we need to reset
339 * it
340 */
341 gh = skb_network_header(skb) +
342 skb_network_header_len(skb);
343 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
344 sizeof(*ershdr));
345 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
346 md->version = ver;
347 md2 = &md->u.md2;
348 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
349 ERSPAN_V2_MDSIZE);
350
351 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
352 info->key.tun_flags);
353 }
354
355 skb_reset_mac_header(skb);
356 ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
357 return PACKET_RCVD;
358 }
359 return PACKET_REJECT;
360
361 drop:
362 kfree_skb(skb);
363 return PACKET_RCVD;
364 }
365
__ipgre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi,struct ip_tunnel_net * itn,int hdr_len,bool raw_proto)366 static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
367 struct ip_tunnel_net *itn, int hdr_len, bool raw_proto)
368 {
369 struct metadata_dst *tun_dst = NULL;
370 const struct iphdr *iph;
371 struct ip_tunnel *tunnel;
372
373 iph = ip_hdr(skb);
374 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
375 iph->saddr, iph->daddr, tpi->key);
376
377 if (tunnel) {
378 const struct iphdr *tnl_params;
379
380 if (__iptunnel_pull_header(skb, hdr_len, tpi->proto,
381 raw_proto, false) < 0)
382 goto drop;
383
384 /* Special case for ipgre_header_parse(), which expects the
385 * mac_header to point to the outer IP header.
386 */
387 if (tunnel->dev->header_ops == &ipgre_header_ops)
388 skb_pop_mac_header(skb);
389 else
390 skb_reset_mac_header(skb);
391
392 tnl_params = &tunnel->parms.iph;
393 if (tunnel->collect_md || tnl_params->daddr == 0) {
394 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
395 __be64 tun_id;
396
397 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
398 __set_bit(IP_TUNNEL_KEY_BIT, flags);
399 ip_tunnel_flags_and(flags, tpi->flags, flags);
400
401 tun_id = key32_to_tunnel_id(tpi->key);
402 tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0);
403 if (!tun_dst)
404 return PACKET_REJECT;
405 }
406
407 ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
408 return PACKET_RCVD;
409 }
410 return PACKET_NEXT;
411
412 drop:
413 kfree_skb(skb);
414 return PACKET_RCVD;
415 }
416
ipgre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi,int hdr_len)417 static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
418 int hdr_len)
419 {
420 struct net *net = dev_net(skb->dev);
421 struct ip_tunnel_net *itn;
422 int res;
423
424 if (tpi->proto == htons(ETH_P_TEB))
425 itn = net_generic(net, gre_tap_net_id);
426 else
427 itn = net_generic(net, ipgre_net_id);
428
429 res = __ipgre_rcv(skb, tpi, itn, hdr_len, false);
430 if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) {
431 /* ipgre tunnels in collect metadata mode should receive
432 * also ETH_P_TEB traffic.
433 */
434 itn = net_generic(net, ipgre_net_id);
435 res = __ipgre_rcv(skb, tpi, itn, hdr_len, true);
436 }
437 return res;
438 }
439
gre_rcv(struct sk_buff * skb)440 static int gre_rcv(struct sk_buff *skb)
441 {
442 struct tnl_ptk_info tpi;
443 bool csum_err = false;
444 int hdr_len;
445
446 #ifdef CONFIG_NET_IPGRE_BROADCAST
447 if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
448 /* Looped back packet, drop it! */
449 if (rt_is_output_route(skb_rtable(skb)))
450 goto drop;
451 }
452 #endif
453
454 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0);
455 if (hdr_len < 0)
456 goto drop;
457
458 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
459 tpi.proto == htons(ETH_P_ERSPAN2))) {
460 if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
461 return 0;
462 goto out;
463 }
464
465 if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
466 return 0;
467
468 out:
469 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
470 drop:
471 dev_core_stats_rx_dropped_inc(skb->dev);
472 kfree_skb(skb);
473 return 0;
474 }
475
__gre_xmit(struct sk_buff * skb,struct net_device * dev,const struct iphdr * tnl_params,__be16 proto)476 static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
477 const struct iphdr *tnl_params,
478 __be16 proto)
479 {
480 struct ip_tunnel *tunnel = netdev_priv(dev);
481 IP_TUNNEL_DECLARE_FLAGS(flags);
482
483 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
484
485 /* Push GRE header. */
486 gre_build_header(skb, tunnel->tun_hlen,
487 flags, proto, tunnel->parms.o_key,
488 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
489 htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 0);
490
491 ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol);
492 }
493
gre_handle_offloads(struct sk_buff * skb,bool csum)494 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
495 {
496 return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
497 }
498
gre_fb_xmit(struct sk_buff * skb,struct net_device * dev,__be16 proto)499 static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
500 __be16 proto)
501 {
502 struct ip_tunnel *tunnel = netdev_priv(dev);
503 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
504 struct ip_tunnel_info *tun_info;
505 const struct ip_tunnel_key *key;
506 int tunnel_hlen;
507
508 tun_info = skb_tunnel_info(skb);
509 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
510 ip_tunnel_info_af(tun_info) != AF_INET))
511 goto err_free_skb;
512
513 key = &tun_info->key;
514 tunnel_hlen = gre_calc_hlen(key->tun_flags);
515
516 if (skb_cow_head(skb, dev->needed_headroom))
517 goto err_free_skb;
518
519 /* Push Tunnel header. */
520 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
521 tunnel->parms.o_flags)))
522 goto err_free_skb;
523
524 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
525 __set_bit(IP_TUNNEL_KEY_BIT, flags);
526 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
527 ip_tunnel_flags_and(flags, tun_info->key.tun_flags, flags);
528
529 gre_build_header(skb, tunnel_hlen, flags, proto,
530 tunnel_id_to_key32(tun_info->key.tun_id),
531 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
532 htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 0);
533
534 ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen);
535
536 return;
537
538 err_free_skb:
539 kfree_skb(skb);
540 DEV_STATS_INC(dev, tx_dropped);
541 }
542
erspan_fb_xmit(struct sk_buff * skb,struct net_device * dev)543 static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev)
544 {
545 struct ip_tunnel *tunnel = netdev_priv(dev);
546 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
547 struct ip_tunnel_info *tun_info;
548 const struct ip_tunnel_key *key;
549 struct erspan_metadata *md;
550 bool truncate = false;
551 __be16 proto;
552 int tunnel_hlen;
553 int version;
554 int nhoff;
555
556 tun_info = skb_tunnel_info(skb);
557 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
558 ip_tunnel_info_af(tun_info) != AF_INET))
559 goto err_free_skb;
560
561 key = &tun_info->key;
562 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_info->key.tun_flags))
563 goto err_free_skb;
564 if (tun_info->options_len < sizeof(*md))
565 goto err_free_skb;
566 md = ip_tunnel_info_opts(tun_info);
567
568 /* ERSPAN has fixed 8 byte GRE header */
569 version = md->version;
570 tunnel_hlen = 8 + erspan_hdr_len(version);
571
572 if (skb_cow_head(skb, dev->needed_headroom))
573 goto err_free_skb;
574
575 if (gre_handle_offloads(skb, false))
576 goto err_free_skb;
577
578 if (skb->len > dev->mtu + dev->hard_header_len) {
579 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
580 goto err_free_skb;
581 truncate = true;
582 }
583
584 nhoff = skb_network_offset(skb);
585 if (skb->protocol == htons(ETH_P_IP) &&
586 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
587 truncate = true;
588
589 if (skb->protocol == htons(ETH_P_IPV6)) {
590 int thoff;
591
592 if (skb_transport_header_was_set(skb))
593 thoff = skb_transport_offset(skb);
594 else
595 thoff = nhoff + sizeof(struct ipv6hdr);
596 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
597 truncate = true;
598 }
599
600 if (version == 1) {
601 erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)),
602 ntohl(md->u.index), truncate, true);
603 proto = htons(ETH_P_ERSPAN);
604 } else if (version == 2) {
605 erspan_build_header_v2(skb,
606 ntohl(tunnel_id_to_key32(key->tun_id)),
607 md->u.md2.dir,
608 get_hwid(&md->u.md2),
609 truncate, true);
610 proto = htons(ETH_P_ERSPAN2);
611 } else {
612 goto err_free_skb;
613 }
614
615 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
616 gre_build_header(skb, 8, flags, proto, 0,
617 htonl(atomic_fetch_inc(&tunnel->o_seqno)));
618
619 ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen);
620
621 return;
622
623 err_free_skb:
624 kfree_skb(skb);
625 DEV_STATS_INC(dev, tx_dropped);
626 }
627
gre_fill_metadata_dst(struct net_device * dev,struct sk_buff * skb)628 static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
629 {
630 struct ip_tunnel_info *info = skb_tunnel_info(skb);
631 const struct ip_tunnel_key *key;
632 struct rtable *rt;
633 struct flowi4 fl4;
634
635 if (ip_tunnel_info_af(info) != AF_INET)
636 return -EINVAL;
637
638 key = &info->key;
639 ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src,
640 tunnel_id_to_key32(key->tun_id),
641 key->tos & ~INET_ECN_MASK, dev_net(dev), 0,
642 skb->mark, skb_get_hash(skb), key->flow_flags);
643 rt = ip_route_output_key(dev_net(dev), &fl4);
644 if (IS_ERR(rt))
645 return PTR_ERR(rt);
646
647 ip_rt_put(rt);
648 info->key.u.ipv4.src = fl4.saddr;
649 return 0;
650 }
651
ipgre_xmit(struct sk_buff * skb,struct net_device * dev)652 static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
653 struct net_device *dev)
654 {
655 struct ip_tunnel *tunnel = netdev_priv(dev);
656 const struct iphdr *tnl_params;
657
658 if (!pskb_inet_may_pull(skb))
659 goto free_skb;
660
661 if (tunnel->collect_md) {
662 gre_fb_xmit(skb, dev, skb->protocol);
663 return NETDEV_TX_OK;
664 }
665
666 if (dev->header_ops) {
667 int pull_len = tunnel->hlen + sizeof(struct iphdr);
668
669 if (skb_cow_head(skb, 0))
670 goto free_skb;
671
672 if (!pskb_may_pull(skb, pull_len))
673 goto free_skb;
674
675 tnl_params = (const struct iphdr *)skb->data;
676
677 /* ip_tunnel_xmit() needs skb->data pointing to gre header. */
678 skb_pull(skb, pull_len);
679 skb_reset_mac_header(skb);
680
681 if (skb->ip_summed == CHECKSUM_PARTIAL &&
682 skb_checksum_start(skb) < skb->data)
683 goto free_skb;
684 } else {
685 if (skb_cow_head(skb, dev->needed_headroom))
686 goto free_skb;
687
688 tnl_params = &tunnel->parms.iph;
689 }
690
691 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
692 tunnel->parms.o_flags)))
693 goto free_skb;
694
695 __gre_xmit(skb, dev, tnl_params, skb->protocol);
696 return NETDEV_TX_OK;
697
698 free_skb:
699 kfree_skb(skb);
700 DEV_STATS_INC(dev, tx_dropped);
701 return NETDEV_TX_OK;
702 }
703
erspan_xmit(struct sk_buff * skb,struct net_device * dev)704 static netdev_tx_t erspan_xmit(struct sk_buff *skb,
705 struct net_device *dev)
706 {
707 struct ip_tunnel *tunnel = netdev_priv(dev);
708 bool truncate = false;
709 __be16 proto;
710
711 if (!pskb_inet_may_pull(skb))
712 goto free_skb;
713
714 if (tunnel->collect_md) {
715 erspan_fb_xmit(skb, dev);
716 return NETDEV_TX_OK;
717 }
718
719 if (gre_handle_offloads(skb, false))
720 goto free_skb;
721
722 if (skb_cow_head(skb, dev->needed_headroom))
723 goto free_skb;
724
725 if (skb->len > dev->mtu + dev->hard_header_len) {
726 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
727 goto free_skb;
728 truncate = true;
729 }
730
731 /* Push ERSPAN header */
732 if (tunnel->erspan_ver == 0) {
733 proto = htons(ETH_P_ERSPAN);
734 __clear_bit(IP_TUNNEL_SEQ_BIT, tunnel->parms.o_flags);
735 } else if (tunnel->erspan_ver == 1) {
736 erspan_build_header(skb, ntohl(tunnel->parms.o_key),
737 tunnel->index,
738 truncate, true);
739 proto = htons(ETH_P_ERSPAN);
740 } else if (tunnel->erspan_ver == 2) {
741 erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key),
742 tunnel->dir, tunnel->hwid,
743 truncate, true);
744 proto = htons(ETH_P_ERSPAN2);
745 } else {
746 goto free_skb;
747 }
748
749 __clear_bit(IP_TUNNEL_KEY_BIT, tunnel->parms.o_flags);
750 __gre_xmit(skb, dev, &tunnel->parms.iph, proto);
751 return NETDEV_TX_OK;
752
753 free_skb:
754 kfree_skb(skb);
755 DEV_STATS_INC(dev, tx_dropped);
756 return NETDEV_TX_OK;
757 }
758
gre_tap_xmit(struct sk_buff * skb,struct net_device * dev)759 static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
760 struct net_device *dev)
761 {
762 struct ip_tunnel *tunnel = netdev_priv(dev);
763
764 if (!pskb_inet_may_pull(skb))
765 goto free_skb;
766
767 if (tunnel->collect_md) {
768 gre_fb_xmit(skb, dev, htons(ETH_P_TEB));
769 return NETDEV_TX_OK;
770 }
771
772 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
773 tunnel->parms.o_flags)))
774 goto free_skb;
775
776 if (skb_cow_head(skb, dev->needed_headroom))
777 goto free_skb;
778
779 __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
780 return NETDEV_TX_OK;
781
782 free_skb:
783 kfree_skb(skb);
784 DEV_STATS_INC(dev, tx_dropped);
785 return NETDEV_TX_OK;
786 }
787
ipgre_link_update(struct net_device * dev,bool set_mtu)788 static void ipgre_link_update(struct net_device *dev, bool set_mtu)
789 {
790 struct ip_tunnel *tunnel = netdev_priv(dev);
791 int len;
792
793 len = tunnel->tun_hlen;
794 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
795 len = tunnel->tun_hlen - len;
796 tunnel->hlen = tunnel->hlen + len;
797
798 if (dev->header_ops)
799 dev->hard_header_len += len;
800 else
801 dev->needed_headroom += len;
802
803 if (set_mtu)
804 WRITE_ONCE(dev->mtu, max_t(int, dev->mtu - len, 68));
805
806 if (test_bit(IP_TUNNEL_SEQ_BIT, tunnel->parms.o_flags) ||
807 (test_bit(IP_TUNNEL_CSUM_BIT, tunnel->parms.o_flags) &&
808 tunnel->encap.type != TUNNEL_ENCAP_NONE)) {
809 dev->features &= ~NETIF_F_GSO_SOFTWARE;
810 dev->hw_features &= ~NETIF_F_GSO_SOFTWARE;
811 } else {
812 dev->features |= NETIF_F_GSO_SOFTWARE;
813 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
814 }
815 }
816
ipgre_tunnel_ctl(struct net_device * dev,struct ip_tunnel_parm_kern * p,int cmd)817 static int ipgre_tunnel_ctl(struct net_device *dev,
818 struct ip_tunnel_parm_kern *p,
819 int cmd)
820 {
821 __be16 i_flags, o_flags;
822 int err;
823
824 if (!ip_tunnel_flags_is_be16_compat(p->i_flags) ||
825 !ip_tunnel_flags_is_be16_compat(p->o_flags))
826 return -EOVERFLOW;
827
828 i_flags = ip_tunnel_flags_to_be16(p->i_flags);
829 o_flags = ip_tunnel_flags_to_be16(p->o_flags);
830
831 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
832 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE ||
833 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) ||
834 ((i_flags | o_flags) & (GRE_VERSION | GRE_ROUTING)))
835 return -EINVAL;
836 }
837
838 gre_flags_to_tnl_flags(p->i_flags, i_flags);
839 gre_flags_to_tnl_flags(p->o_flags, o_flags);
840
841 err = ip_tunnel_ctl(dev, p, cmd);
842 if (err)
843 return err;
844
845 if (cmd == SIOCCHGTUNNEL) {
846 struct ip_tunnel *t = netdev_priv(dev);
847
848 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
849 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
850
851 if (strcmp(dev->rtnl_link_ops->kind, "erspan"))
852 ipgre_link_update(dev, true);
853 }
854
855 i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
856 ip_tunnel_flags_from_be16(p->i_flags, i_flags);
857 o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
858 ip_tunnel_flags_from_be16(p->o_flags, o_flags);
859
860 return 0;
861 }
862
863 /* Nice toy. Unfortunately, useless in real life :-)
864 It allows to construct virtual multiprotocol broadcast "LAN"
865 over the Internet, provided multicast routing is tuned.
866
867
868 I have no idea was this bicycle invented before me,
869 so that I had to set ARPHRD_IPGRE to a random value.
870 I have an impression, that Cisco could make something similar,
871 but this feature is apparently missing in IOS<=11.2(8).
872
873 I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks
874 with broadcast 224.66.66.66. If you have access to mbone, play with me :-)
875
876 ping -t 255 224.66.66.66
877
878 If nobody answers, mbone does not work.
879
880 ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255
881 ip addr add 10.66.66.<somewhat>/24 dev Universe
882 ifconfig Universe up
883 ifconfig Universe add fe80::<Your_real_addr>/10
884 ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96
885 ftp 10.66.66.66
886 ...
887 ftp fec0:6666:6666::193.233.7.65
888 ...
889 */
ipgre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)890 static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
891 unsigned short type,
892 const void *daddr, const void *saddr, unsigned int len)
893 {
894 struct ip_tunnel *t = netdev_priv(dev);
895 struct gre_base_hdr *greh;
896 struct iphdr *iph;
897 int needed;
898
899 needed = t->hlen + sizeof(*iph);
900 if (skb_headroom(skb) < needed &&
901 pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)),
902 0, GFP_ATOMIC))
903 return -needed;
904
905 iph = skb_push(skb, needed);
906 greh = (struct gre_base_hdr *)(iph+1);
907 greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags);
908 greh->protocol = htons(type);
909
910 memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
911
912 /* Set the source hardware address. */
913 if (saddr)
914 memcpy(&iph->saddr, saddr, 4);
915 if (daddr)
916 memcpy(&iph->daddr, daddr, 4);
917 if (iph->daddr)
918 return t->hlen + sizeof(*iph);
919
920 return -(t->hlen + sizeof(*iph));
921 }
922
ipgre_header_parse(const struct sk_buff * skb,const struct net_device * dev,unsigned char * haddr)923 static int ipgre_header_parse(const struct sk_buff *skb, const struct net_device *dev,
924 unsigned char *haddr)
925 {
926 const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb);
927 memcpy(haddr, &iph->saddr, 4);
928 return 4;
929 }
930
931 static const struct header_ops ipgre_header_ops = {
932 .create = ipgre_header,
933 .parse = ipgre_header_parse,
934 };
935
936 #ifdef CONFIG_NET_IPGRE_BROADCAST
ipgre_open(struct net_device * dev)937 static int ipgre_open(struct net_device *dev)
938 {
939 struct ip_tunnel *t = netdev_priv(dev);
940
941 if (ipv4_is_multicast(t->parms.iph.daddr)) {
942 struct flowi4 fl4 = {
943 .flowi4_oif = t->parms.link,
944 .flowi4_dscp = ip4h_dscp(&t->parms.iph),
945 .flowi4_scope = RT_SCOPE_UNIVERSE,
946 .flowi4_proto = IPPROTO_GRE,
947 .saddr = t->parms.iph.saddr,
948 .daddr = t->parms.iph.daddr,
949 .fl4_gre_key = t->parms.o_key,
950 };
951 struct rtable *rt;
952
953 rt = ip_route_output_key(t->net, &fl4);
954 if (IS_ERR(rt))
955 return -EADDRNOTAVAIL;
956 dev = rt->dst.dev;
957 ip_rt_put(rt);
958 if (!__in_dev_get_rtnl(dev))
959 return -EADDRNOTAVAIL;
960 t->mlink = dev->ifindex;
961 ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr);
962 }
963 return 0;
964 }
965
ipgre_close(struct net_device * dev)966 static int ipgre_close(struct net_device *dev)
967 {
968 struct ip_tunnel *t = netdev_priv(dev);
969
970 if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) {
971 struct in_device *in_dev;
972 in_dev = inetdev_by_index(t->net, t->mlink);
973 if (in_dev)
974 ip_mc_dec_group(in_dev, t->parms.iph.daddr);
975 }
976 return 0;
977 }
978 #endif
979
980 static const struct net_device_ops ipgre_netdev_ops = {
981 .ndo_init = ipgre_tunnel_init,
982 .ndo_uninit = ip_tunnel_uninit,
983 #ifdef CONFIG_NET_IPGRE_BROADCAST
984 .ndo_open = ipgre_open,
985 .ndo_stop = ipgre_close,
986 #endif
987 .ndo_start_xmit = ipgre_xmit,
988 .ndo_siocdevprivate = ip_tunnel_siocdevprivate,
989 .ndo_change_mtu = ip_tunnel_change_mtu,
990 .ndo_get_stats64 = dev_get_tstats64,
991 .ndo_get_iflink = ip_tunnel_get_iflink,
992 .ndo_tunnel_ctl = ipgre_tunnel_ctl,
993 };
994
995 #define GRE_FEATURES (NETIF_F_SG | \
996 NETIF_F_FRAGLIST | \
997 NETIF_F_HIGHDMA | \
998 NETIF_F_HW_CSUM)
999
ipgre_tunnel_setup(struct net_device * dev)1000 static void ipgre_tunnel_setup(struct net_device *dev)
1001 {
1002 dev->netdev_ops = &ipgre_netdev_ops;
1003 dev->type = ARPHRD_IPGRE;
1004 ip_tunnel_setup(dev, ipgre_net_id);
1005 }
1006
__gre_tunnel_init(struct net_device * dev)1007 static void __gre_tunnel_init(struct net_device *dev)
1008 {
1009 struct ip_tunnel *tunnel;
1010
1011 tunnel = netdev_priv(dev);
1012 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1013 tunnel->parms.iph.protocol = IPPROTO_GRE;
1014
1015 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1016 dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph);
1017
1018 dev->features |= GRE_FEATURES;
1019 dev->hw_features |= GRE_FEATURES;
1020
1021 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1022 * levels of outer headers requiring an update.
1023 */
1024 if (test_bit(IP_TUNNEL_SEQ_BIT, tunnel->parms.o_flags))
1025 return;
1026 if (test_bit(IP_TUNNEL_CSUM_BIT, tunnel->parms.o_flags) &&
1027 tunnel->encap.type != TUNNEL_ENCAP_NONE)
1028 return;
1029
1030 dev->features |= NETIF_F_GSO_SOFTWARE;
1031 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1032
1033 dev->lltx = true;
1034 }
1035
ipgre_tunnel_init(struct net_device * dev)1036 static int ipgre_tunnel_init(struct net_device *dev)
1037 {
1038 struct ip_tunnel *tunnel = netdev_priv(dev);
1039 struct iphdr *iph = &tunnel->parms.iph;
1040
1041 __gre_tunnel_init(dev);
1042
1043 __dev_addr_set(dev, &iph->saddr, 4);
1044 memcpy(dev->broadcast, &iph->daddr, 4);
1045
1046 dev->flags = IFF_NOARP;
1047 netif_keep_dst(dev);
1048 dev->addr_len = 4;
1049
1050 if (iph->daddr && !tunnel->collect_md) {
1051 #ifdef CONFIG_NET_IPGRE_BROADCAST
1052 if (ipv4_is_multicast(iph->daddr)) {
1053 if (!iph->saddr)
1054 return -EINVAL;
1055 dev->flags = IFF_BROADCAST;
1056 dev->header_ops = &ipgre_header_ops;
1057 dev->hard_header_len = tunnel->hlen + sizeof(*iph);
1058 dev->needed_headroom = 0;
1059 }
1060 #endif
1061 } else if (!tunnel->collect_md) {
1062 dev->header_ops = &ipgre_header_ops;
1063 dev->hard_header_len = tunnel->hlen + sizeof(*iph);
1064 dev->needed_headroom = 0;
1065 }
1066
1067 return ip_tunnel_init(dev);
1068 }
1069
1070 static const struct gre_protocol ipgre_protocol = {
1071 .handler = gre_rcv,
1072 .err_handler = gre_err,
1073 };
1074
ipgre_init_net(struct net * net)1075 static int __net_init ipgre_init_net(struct net *net)
1076 {
1077 return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
1078 }
1079
ipgre_exit_rtnl(struct net * net,struct list_head * dev_to_kill)1080 static void __net_exit ipgre_exit_rtnl(struct net *net,
1081 struct list_head *dev_to_kill)
1082 {
1083 ip_tunnel_delete_net(net, ipgre_net_id, &ipgre_link_ops, dev_to_kill);
1084 }
1085
1086 static struct pernet_operations ipgre_net_ops = {
1087 .init = ipgre_init_net,
1088 .exit_rtnl = ipgre_exit_rtnl,
1089 .id = &ipgre_net_id,
1090 .size = sizeof(struct ip_tunnel_net),
1091 };
1092
ipgre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1093 static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1094 struct netlink_ext_ack *extack)
1095 {
1096 __be16 flags;
1097
1098 if (!data)
1099 return 0;
1100
1101 flags = 0;
1102 if (data[IFLA_GRE_IFLAGS])
1103 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1104 if (data[IFLA_GRE_OFLAGS])
1105 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1106 if (flags & (GRE_VERSION|GRE_ROUTING))
1107 return -EINVAL;
1108
1109 if (data[IFLA_GRE_COLLECT_METADATA] &&
1110 data[IFLA_GRE_ENCAP_TYPE] &&
1111 nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE)
1112 return -EINVAL;
1113
1114 return 0;
1115 }
1116
ipgre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1117 static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1118 struct netlink_ext_ack *extack)
1119 {
1120 __be32 daddr;
1121
1122 if (tb[IFLA_ADDRESS]) {
1123 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1124 return -EINVAL;
1125 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1126 return -EADDRNOTAVAIL;
1127 }
1128
1129 if (!data)
1130 goto out;
1131
1132 if (data[IFLA_GRE_REMOTE]) {
1133 memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4);
1134 if (!daddr)
1135 return -EINVAL;
1136 }
1137
1138 out:
1139 return ipgre_tunnel_validate(tb, data, extack);
1140 }
1141
erspan_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1142 static int erspan_validate(struct nlattr *tb[], struct nlattr *data[],
1143 struct netlink_ext_ack *extack)
1144 {
1145 __be16 flags = 0;
1146 int ret;
1147
1148 if (!data)
1149 return 0;
1150
1151 ret = ipgre_tap_validate(tb, data, extack);
1152 if (ret)
1153 return ret;
1154
1155 if (data[IFLA_GRE_ERSPAN_VER] &&
1156 nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0)
1157 return 0;
1158
1159 /* ERSPAN type II/III should only have GRE sequence and key flag */
1160 if (data[IFLA_GRE_OFLAGS])
1161 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1162 if (data[IFLA_GRE_IFLAGS])
1163 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1164 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1165 flags != (GRE_SEQ | GRE_KEY))
1166 return -EINVAL;
1167
1168 /* ERSPAN Session ID only has 10-bit. Since we reuse
1169 * 32-bit key field as ID, check it's range.
1170 */
1171 if (data[IFLA_GRE_IKEY] &&
1172 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1173 return -EINVAL;
1174
1175 if (data[IFLA_GRE_OKEY] &&
1176 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1177 return -EINVAL;
1178
1179 return 0;
1180 }
1181
ipgre_netlink_parms(struct net_device * dev,struct nlattr * data[],struct nlattr * tb[],struct ip_tunnel_parm_kern * parms,__u32 * fwmark)1182 static int ipgre_netlink_parms(struct net_device *dev,
1183 struct nlattr *data[],
1184 struct nlattr *tb[],
1185 struct ip_tunnel_parm_kern *parms,
1186 __u32 *fwmark)
1187 {
1188 struct ip_tunnel *t = netdev_priv(dev);
1189
1190 memset(parms, 0, sizeof(*parms));
1191
1192 parms->iph.protocol = IPPROTO_GRE;
1193
1194 if (!data)
1195 return 0;
1196
1197 if (data[IFLA_GRE_LINK])
1198 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1199
1200 if (data[IFLA_GRE_IFLAGS])
1201 gre_flags_to_tnl_flags(parms->i_flags,
1202 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1203
1204 if (data[IFLA_GRE_OFLAGS])
1205 gre_flags_to_tnl_flags(parms->o_flags,
1206 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1207
1208 if (data[IFLA_GRE_IKEY])
1209 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1210
1211 if (data[IFLA_GRE_OKEY])
1212 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1213
1214 if (data[IFLA_GRE_LOCAL])
1215 parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]);
1216
1217 if (data[IFLA_GRE_REMOTE])
1218 parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]);
1219
1220 if (data[IFLA_GRE_TTL])
1221 parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]);
1222
1223 if (data[IFLA_GRE_TOS])
1224 parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]);
1225
1226 if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) {
1227 if (t->ignore_df)
1228 return -EINVAL;
1229 parms->iph.frag_off = htons(IP_DF);
1230 }
1231
1232 if (data[IFLA_GRE_COLLECT_METADATA]) {
1233 t->collect_md = true;
1234 if (dev->type == ARPHRD_IPGRE)
1235 dev->type = ARPHRD_NONE;
1236 }
1237
1238 if (data[IFLA_GRE_IGNORE_DF]) {
1239 if (nla_get_u8(data[IFLA_GRE_IGNORE_DF])
1240 && (parms->iph.frag_off & htons(IP_DF)))
1241 return -EINVAL;
1242 t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]);
1243 }
1244
1245 if (data[IFLA_GRE_FWMARK])
1246 *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1247
1248 return 0;
1249 }
1250
erspan_netlink_parms(struct net_device * dev,struct nlattr * data[],struct nlattr * tb[],struct ip_tunnel_parm_kern * parms,__u32 * fwmark)1251 static int erspan_netlink_parms(struct net_device *dev,
1252 struct nlattr *data[],
1253 struct nlattr *tb[],
1254 struct ip_tunnel_parm_kern *parms,
1255 __u32 *fwmark)
1256 {
1257 struct ip_tunnel *t = netdev_priv(dev);
1258 int err;
1259
1260 err = ipgre_netlink_parms(dev, data, tb, parms, fwmark);
1261 if (err)
1262 return err;
1263 if (!data)
1264 return 0;
1265
1266 if (data[IFLA_GRE_ERSPAN_VER]) {
1267 t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1268
1269 if (t->erspan_ver > 2)
1270 return -EINVAL;
1271 }
1272
1273 if (t->erspan_ver == 1) {
1274 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1275 t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1276 if (t->index & ~INDEX_MASK)
1277 return -EINVAL;
1278 }
1279 } else if (t->erspan_ver == 2) {
1280 if (data[IFLA_GRE_ERSPAN_DIR]) {
1281 t->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1282 if (t->dir & ~(DIR_MASK >> DIR_OFFSET))
1283 return -EINVAL;
1284 }
1285 if (data[IFLA_GRE_ERSPAN_HWID]) {
1286 t->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1287 if (t->hwid & ~(HWID_MASK >> HWID_OFFSET))
1288 return -EINVAL;
1289 }
1290 }
1291
1292 return 0;
1293 }
1294
1295 /* This function returns true when ENCAP attributes are present in the nl msg */
ipgre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1296 static bool ipgre_netlink_encap_parms(struct nlattr *data[],
1297 struct ip_tunnel_encap *ipencap)
1298 {
1299 bool ret = false;
1300
1301 memset(ipencap, 0, sizeof(*ipencap));
1302
1303 if (!data)
1304 return ret;
1305
1306 if (data[IFLA_GRE_ENCAP_TYPE]) {
1307 ret = true;
1308 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1309 }
1310
1311 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1312 ret = true;
1313 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1314 }
1315
1316 if (data[IFLA_GRE_ENCAP_SPORT]) {
1317 ret = true;
1318 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1319 }
1320
1321 if (data[IFLA_GRE_ENCAP_DPORT]) {
1322 ret = true;
1323 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1324 }
1325
1326 return ret;
1327 }
1328
gre_tap_init(struct net_device * dev)1329 static int gre_tap_init(struct net_device *dev)
1330 {
1331 __gre_tunnel_init(dev);
1332 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1333 netif_keep_dst(dev);
1334
1335 return ip_tunnel_init(dev);
1336 }
1337
1338 static const struct net_device_ops gre_tap_netdev_ops = {
1339 .ndo_init = gre_tap_init,
1340 .ndo_uninit = ip_tunnel_uninit,
1341 .ndo_start_xmit = gre_tap_xmit,
1342 .ndo_set_mac_address = eth_mac_addr,
1343 .ndo_validate_addr = eth_validate_addr,
1344 .ndo_change_mtu = ip_tunnel_change_mtu,
1345 .ndo_get_stats64 = dev_get_tstats64,
1346 .ndo_get_iflink = ip_tunnel_get_iflink,
1347 .ndo_fill_metadata_dst = gre_fill_metadata_dst,
1348 };
1349
erspan_tunnel_init(struct net_device * dev)1350 static int erspan_tunnel_init(struct net_device *dev)
1351 {
1352 struct ip_tunnel *tunnel = netdev_priv(dev);
1353
1354 if (tunnel->erspan_ver == 0)
1355 tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */
1356 else
1357 tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */
1358
1359 tunnel->parms.iph.protocol = IPPROTO_GRE;
1360 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1361 erspan_hdr_len(tunnel->erspan_ver);
1362
1363 dev->features |= GRE_FEATURES;
1364 dev->hw_features |= GRE_FEATURES;
1365 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1366 netif_keep_dst(dev);
1367
1368 return ip_tunnel_init(dev);
1369 }
1370
1371 static const struct net_device_ops erspan_netdev_ops = {
1372 .ndo_init = erspan_tunnel_init,
1373 .ndo_uninit = ip_tunnel_uninit,
1374 .ndo_start_xmit = erspan_xmit,
1375 .ndo_set_mac_address = eth_mac_addr,
1376 .ndo_validate_addr = eth_validate_addr,
1377 .ndo_change_mtu = ip_tunnel_change_mtu,
1378 .ndo_get_stats64 = dev_get_tstats64,
1379 .ndo_get_iflink = ip_tunnel_get_iflink,
1380 .ndo_fill_metadata_dst = gre_fill_metadata_dst,
1381 };
1382
ipgre_tap_setup(struct net_device * dev)1383 static void ipgre_tap_setup(struct net_device *dev)
1384 {
1385 ether_setup(dev);
1386 dev->max_mtu = 0;
1387 dev->netdev_ops = &gre_tap_netdev_ops;
1388 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1389 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1390 ip_tunnel_setup(dev, gre_tap_net_id);
1391 }
1392
1393 static int
ipgre_newlink_encap_setup(struct net_device * dev,struct nlattr * data[])1394 ipgre_newlink_encap_setup(struct net_device *dev, struct nlattr *data[])
1395 {
1396 struct ip_tunnel_encap ipencap;
1397
1398 if (ipgre_netlink_encap_parms(data, &ipencap)) {
1399 struct ip_tunnel *t = netdev_priv(dev);
1400 int err = ip_tunnel_encap_setup(t, &ipencap);
1401
1402 if (err < 0)
1403 return err;
1404 }
1405
1406 return 0;
1407 }
1408
ipgre_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)1409 static int ipgre_newlink(struct net_device *dev,
1410 struct rtnl_newlink_params *params,
1411 struct netlink_ext_ack *extack)
1412 {
1413 struct nlattr **data = params->data;
1414 struct nlattr **tb = params->tb;
1415 struct ip_tunnel_parm_kern p;
1416 __u32 fwmark = 0;
1417 int err;
1418
1419 err = ipgre_newlink_encap_setup(dev, data);
1420 if (err)
1421 return err;
1422
1423 err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark);
1424 if (err < 0)
1425 return err;
1426 return ip_tunnel_newlink(params->link_net ? : dev_net(dev), dev, tb, &p,
1427 fwmark);
1428 }
1429
erspan_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)1430 static int erspan_newlink(struct net_device *dev,
1431 struct rtnl_newlink_params *params,
1432 struct netlink_ext_ack *extack)
1433 {
1434 struct nlattr **data = params->data;
1435 struct nlattr **tb = params->tb;
1436 struct ip_tunnel_parm_kern p;
1437 __u32 fwmark = 0;
1438 int err;
1439
1440 err = ipgre_newlink_encap_setup(dev, data);
1441 if (err)
1442 return err;
1443
1444 err = erspan_netlink_parms(dev, data, tb, &p, &fwmark);
1445 if (err)
1446 return err;
1447 return ip_tunnel_newlink(params->link_net ? : dev_net(dev), dev, tb, &p,
1448 fwmark);
1449 }
1450
ipgre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1451 static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
1452 struct nlattr *data[],
1453 struct netlink_ext_ack *extack)
1454 {
1455 struct ip_tunnel *t = netdev_priv(dev);
1456 struct ip_tunnel_parm_kern p;
1457 __u32 fwmark = t->fwmark;
1458 int err;
1459
1460 err = ipgre_newlink_encap_setup(dev, data);
1461 if (err)
1462 return err;
1463
1464 err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark);
1465 if (err < 0)
1466 return err;
1467
1468 err = ip_tunnel_changelink(dev, tb, &p, fwmark);
1469 if (err < 0)
1470 return err;
1471
1472 ip_tunnel_flags_copy(t->parms.i_flags, p.i_flags);
1473 ip_tunnel_flags_copy(t->parms.o_flags, p.o_flags);
1474
1475 ipgre_link_update(dev, !tb[IFLA_MTU]);
1476
1477 return 0;
1478 }
1479
erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1480 static int erspan_changelink(struct net_device *dev, struct nlattr *tb[],
1481 struct nlattr *data[],
1482 struct netlink_ext_ack *extack)
1483 {
1484 struct ip_tunnel *t = netdev_priv(dev);
1485 struct ip_tunnel_parm_kern p;
1486 __u32 fwmark = t->fwmark;
1487 int err;
1488
1489 err = ipgre_newlink_encap_setup(dev, data);
1490 if (err)
1491 return err;
1492
1493 err = erspan_netlink_parms(dev, data, tb, &p, &fwmark);
1494 if (err < 0)
1495 return err;
1496
1497 err = ip_tunnel_changelink(dev, tb, &p, fwmark);
1498 if (err < 0)
1499 return err;
1500
1501 ip_tunnel_flags_copy(t->parms.i_flags, p.i_flags);
1502 ip_tunnel_flags_copy(t->parms.o_flags, p.o_flags);
1503
1504 return 0;
1505 }
1506
ipgre_get_size(const struct net_device * dev)1507 static size_t ipgre_get_size(const struct net_device *dev)
1508 {
1509 return
1510 /* IFLA_GRE_LINK */
1511 nla_total_size(4) +
1512 /* IFLA_GRE_IFLAGS */
1513 nla_total_size(2) +
1514 /* IFLA_GRE_OFLAGS */
1515 nla_total_size(2) +
1516 /* IFLA_GRE_IKEY */
1517 nla_total_size(4) +
1518 /* IFLA_GRE_OKEY */
1519 nla_total_size(4) +
1520 /* IFLA_GRE_LOCAL */
1521 nla_total_size(4) +
1522 /* IFLA_GRE_REMOTE */
1523 nla_total_size(4) +
1524 /* IFLA_GRE_TTL */
1525 nla_total_size(1) +
1526 /* IFLA_GRE_TOS */
1527 nla_total_size(1) +
1528 /* IFLA_GRE_PMTUDISC */
1529 nla_total_size(1) +
1530 /* IFLA_GRE_ENCAP_TYPE */
1531 nla_total_size(2) +
1532 /* IFLA_GRE_ENCAP_FLAGS */
1533 nla_total_size(2) +
1534 /* IFLA_GRE_ENCAP_SPORT */
1535 nla_total_size(2) +
1536 /* IFLA_GRE_ENCAP_DPORT */
1537 nla_total_size(2) +
1538 /* IFLA_GRE_COLLECT_METADATA */
1539 nla_total_size(0) +
1540 /* IFLA_GRE_IGNORE_DF */
1541 nla_total_size(1) +
1542 /* IFLA_GRE_FWMARK */
1543 nla_total_size(4) +
1544 /* IFLA_GRE_ERSPAN_INDEX */
1545 nla_total_size(4) +
1546 /* IFLA_GRE_ERSPAN_VER */
1547 nla_total_size(1) +
1548 /* IFLA_GRE_ERSPAN_DIR */
1549 nla_total_size(1) +
1550 /* IFLA_GRE_ERSPAN_HWID */
1551 nla_total_size(2) +
1552 0;
1553 }
1554
ipgre_fill_info(struct sk_buff * skb,const struct net_device * dev)1555 static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1556 {
1557 struct ip_tunnel *t = netdev_priv(dev);
1558 struct ip_tunnel_parm_kern *p = &t->parms;
1559 IP_TUNNEL_DECLARE_FLAGS(o_flags);
1560
1561 ip_tunnel_flags_copy(o_flags, p->o_flags);
1562
1563 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1564 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1565 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1566 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1567 gre_tnl_flags_to_gre_flags(o_flags)) ||
1568 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1569 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1570 nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) ||
1571 nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) ||
1572 nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) ||
1573 nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) ||
1574 nla_put_u8(skb, IFLA_GRE_PMTUDISC,
1575 !!(p->iph.frag_off & htons(IP_DF))) ||
1576 nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark))
1577 goto nla_put_failure;
1578
1579 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1580 t->encap.type) ||
1581 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1582 t->encap.sport) ||
1583 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1584 t->encap.dport) ||
1585 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1586 t->encap.flags))
1587 goto nla_put_failure;
1588
1589 if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df))
1590 goto nla_put_failure;
1591
1592 if (t->collect_md) {
1593 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
1594 goto nla_put_failure;
1595 }
1596
1597 return 0;
1598
1599 nla_put_failure:
1600 return -EMSGSIZE;
1601 }
1602
erspan_fill_info(struct sk_buff * skb,const struct net_device * dev)1603 static int erspan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1604 {
1605 struct ip_tunnel *t = netdev_priv(dev);
1606
1607 if (t->erspan_ver <= 2) {
1608 if (t->erspan_ver != 0 && !t->collect_md)
1609 __set_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
1610
1611 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver))
1612 goto nla_put_failure;
1613
1614 if (t->erspan_ver == 1) {
1615 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index))
1616 goto nla_put_failure;
1617 } else if (t->erspan_ver == 2) {
1618 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir))
1619 goto nla_put_failure;
1620 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid))
1621 goto nla_put_failure;
1622 }
1623 }
1624
1625 return ipgre_fill_info(skb, dev);
1626
1627 nla_put_failure:
1628 return -EMSGSIZE;
1629 }
1630
erspan_setup(struct net_device * dev)1631 static void erspan_setup(struct net_device *dev)
1632 {
1633 struct ip_tunnel *t = netdev_priv(dev);
1634
1635 ether_setup(dev);
1636 dev->max_mtu = 0;
1637 dev->netdev_ops = &erspan_netdev_ops;
1638 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1639 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1640 ip_tunnel_setup(dev, erspan_net_id);
1641 t->erspan_ver = 1;
1642 }
1643
1644 static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = {
1645 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1646 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1647 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1648 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1649 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1650 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
1651 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1652 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1653 [IFLA_GRE_TOS] = { .type = NLA_U8 },
1654 [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
1655 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1656 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1657 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1658 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1659 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
1660 [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 },
1661 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
1662 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
1663 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
1664 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
1665 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
1666 };
1667
1668 static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
1669 .kind = "gre",
1670 .maxtype = IFLA_GRE_MAX,
1671 .policy = ipgre_policy,
1672 .priv_size = sizeof(struct ip_tunnel),
1673 .setup = ipgre_tunnel_setup,
1674 .validate = ipgre_tunnel_validate,
1675 .newlink = ipgre_newlink,
1676 .changelink = ipgre_changelink,
1677 .dellink = ip_tunnel_dellink,
1678 .get_size = ipgre_get_size,
1679 .fill_info = ipgre_fill_info,
1680 .get_link_net = ip_tunnel_get_link_net,
1681 };
1682
1683 static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
1684 .kind = "gretap",
1685 .maxtype = IFLA_GRE_MAX,
1686 .policy = ipgre_policy,
1687 .priv_size = sizeof(struct ip_tunnel),
1688 .setup = ipgre_tap_setup,
1689 .validate = ipgre_tap_validate,
1690 .newlink = ipgre_newlink,
1691 .changelink = ipgre_changelink,
1692 .dellink = ip_tunnel_dellink,
1693 .get_size = ipgre_get_size,
1694 .fill_info = ipgre_fill_info,
1695 .get_link_net = ip_tunnel_get_link_net,
1696 };
1697
1698 static struct rtnl_link_ops erspan_link_ops __read_mostly = {
1699 .kind = "erspan",
1700 .maxtype = IFLA_GRE_MAX,
1701 .policy = ipgre_policy,
1702 .priv_size = sizeof(struct ip_tunnel),
1703 .setup = erspan_setup,
1704 .validate = erspan_validate,
1705 .newlink = erspan_newlink,
1706 .changelink = erspan_changelink,
1707 .dellink = ip_tunnel_dellink,
1708 .get_size = ipgre_get_size,
1709 .fill_info = erspan_fill_info,
1710 .get_link_net = ip_tunnel_get_link_net,
1711 };
1712
gretap_fb_dev_create(struct net * net,const char * name,u8 name_assign_type)1713 struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
1714 u8 name_assign_type)
1715 {
1716 struct rtnl_newlink_params params = { .src_net = net };
1717 struct nlattr *tb[IFLA_MAX + 1];
1718 struct net_device *dev;
1719 LIST_HEAD(list_kill);
1720 struct ip_tunnel *t;
1721 int err;
1722
1723 memset(&tb, 0, sizeof(tb));
1724 params.tb = tb;
1725
1726 dev = rtnl_create_link(net, name, name_assign_type,
1727 &ipgre_tap_ops, tb, NULL);
1728 if (IS_ERR(dev))
1729 return dev;
1730
1731 /* Configure flow based GRE device. */
1732 t = netdev_priv(dev);
1733 t->collect_md = true;
1734
1735 err = ipgre_newlink(dev, ¶ms, NULL);
1736 if (err < 0) {
1737 free_netdev(dev);
1738 return ERR_PTR(err);
1739 }
1740
1741 /* openvswitch users expect packet sizes to be unrestricted,
1742 * so set the largest MTU we can.
1743 */
1744 err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false);
1745 if (err)
1746 goto out;
1747
1748 err = rtnl_configure_link(dev, NULL, 0, NULL);
1749 if (err < 0)
1750 goto out;
1751
1752 return dev;
1753 out:
1754 ip_tunnel_dellink(dev, &list_kill);
1755 unregister_netdevice_many(&list_kill);
1756 return ERR_PTR(err);
1757 }
1758 EXPORT_SYMBOL_GPL(gretap_fb_dev_create);
1759
ipgre_tap_init_net(struct net * net)1760 static int __net_init ipgre_tap_init_net(struct net *net)
1761 {
1762 return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0");
1763 }
1764
ipgre_tap_exit_rtnl(struct net * net,struct list_head * dev_to_kill)1765 static void __net_exit ipgre_tap_exit_rtnl(struct net *net,
1766 struct list_head *dev_to_kill)
1767 {
1768 ip_tunnel_delete_net(net, gre_tap_net_id, &ipgre_tap_ops, dev_to_kill);
1769 }
1770
1771 static struct pernet_operations ipgre_tap_net_ops = {
1772 .init = ipgre_tap_init_net,
1773 .exit_rtnl = ipgre_tap_exit_rtnl,
1774 .id = &gre_tap_net_id,
1775 .size = sizeof(struct ip_tunnel_net),
1776 };
1777
erspan_init_net(struct net * net)1778 static int __net_init erspan_init_net(struct net *net)
1779 {
1780 return ip_tunnel_init_net(net, erspan_net_id,
1781 &erspan_link_ops, "erspan0");
1782 }
1783
erspan_exit_rtnl(struct net * net,struct list_head * dev_to_kill)1784 static void __net_exit erspan_exit_rtnl(struct net *net,
1785 struct list_head *dev_to_kill)
1786 {
1787 ip_tunnel_delete_net(net, erspan_net_id, &erspan_link_ops, dev_to_kill);
1788 }
1789
1790 static struct pernet_operations erspan_net_ops = {
1791 .init = erspan_init_net,
1792 .exit_rtnl = erspan_exit_rtnl,
1793 .id = &erspan_net_id,
1794 .size = sizeof(struct ip_tunnel_net),
1795 };
1796
ipgre_init(void)1797 static int __init ipgre_init(void)
1798 {
1799 int err;
1800
1801 pr_info("GRE over IPv4 tunneling driver\n");
1802
1803 err = register_pernet_device(&ipgre_net_ops);
1804 if (err < 0)
1805 return err;
1806
1807 err = register_pernet_device(&ipgre_tap_net_ops);
1808 if (err < 0)
1809 goto pnet_tap_failed;
1810
1811 err = register_pernet_device(&erspan_net_ops);
1812 if (err < 0)
1813 goto pnet_erspan_failed;
1814
1815 err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
1816 if (err < 0) {
1817 pr_info("%s: can't add protocol\n", __func__);
1818 goto add_proto_failed;
1819 }
1820
1821 err = rtnl_link_register(&ipgre_link_ops);
1822 if (err < 0)
1823 goto rtnl_link_failed;
1824
1825 err = rtnl_link_register(&ipgre_tap_ops);
1826 if (err < 0)
1827 goto tap_ops_failed;
1828
1829 err = rtnl_link_register(&erspan_link_ops);
1830 if (err < 0)
1831 goto erspan_link_failed;
1832
1833 return 0;
1834
1835 erspan_link_failed:
1836 rtnl_link_unregister(&ipgre_tap_ops);
1837 tap_ops_failed:
1838 rtnl_link_unregister(&ipgre_link_ops);
1839 rtnl_link_failed:
1840 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
1841 add_proto_failed:
1842 unregister_pernet_device(&erspan_net_ops);
1843 pnet_erspan_failed:
1844 unregister_pernet_device(&ipgre_tap_net_ops);
1845 pnet_tap_failed:
1846 unregister_pernet_device(&ipgre_net_ops);
1847 return err;
1848 }
1849
ipgre_fini(void)1850 static void __exit ipgre_fini(void)
1851 {
1852 rtnl_link_unregister(&ipgre_tap_ops);
1853 rtnl_link_unregister(&ipgre_link_ops);
1854 rtnl_link_unregister(&erspan_link_ops);
1855 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
1856 unregister_pernet_device(&ipgre_tap_net_ops);
1857 unregister_pernet_device(&ipgre_net_ops);
1858 unregister_pernet_device(&erspan_net_ops);
1859 }
1860
1861 module_init(ipgre_init);
1862 module_exit(ipgre_fini);
1863 MODULE_DESCRIPTION("IPv4 GRE tunnels over IP library");
1864 MODULE_LICENSE("GPL");
1865 MODULE_ALIAS_RTNL_LINK("gre");
1866 MODULE_ALIAS_RTNL_LINK("gretap");
1867 MODULE_ALIAS_RTNL_LINK("erspan");
1868 MODULE_ALIAS_NETDEV("gre0");
1869 MODULE_ALIAS_NETDEV("gretap0");
1870 MODULE_ALIAS_NETDEV("erspan0");
1871