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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linux NET3: IP/IP protocol decoder.
4 *
5 * Authors:
6 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
7 *
8 * Fixes:
9 * Alan Cox : Merged and made usable non modular (its so tiny its silly as
10 * a module taking up 2 pages).
11 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
12 * to keep ip_forward happy.
13 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
14 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
15 * David Woodhouse : Perform some basic ICMP handling.
16 * IPIP Routing without decapsulation.
17 * Carlos Picoto : GRE over IP support
18 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
19 * I do not want to merge them together.
20 */
21
22/* tunnel.c: an IP tunnel driver
23
24 The purpose of this driver is to provide an IP tunnel through
25 which you can tunnel network traffic transparently across subnets.
26
27 This was written by looking at Nick Holloway's dummy driver
28 Thanks for the great code!
29
30 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
31
32 Minor tweaks:
33 Cleaned up the code a little and added some pre-1.3.0 tweaks.
34 dev->hard_header/hard_header_len changed to use no headers.
35 Comments/bracketing tweaked.
36 Made the tunnels use dev->name not tunnel: when error reporting.
37 Added tx_dropped stat
38
39 -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95
40
41 Reworked:
42 Changed to tunnel to destination gateway in addition to the
43 tunnel's pointopoint address
44 Almost completely rewritten
45 Note: There is currently no firewall or ICMP handling done.
46
47 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96
48
49*/
50
51/* Things I wish I had known when writing the tunnel driver:
52
53 When the tunnel_xmit() function is called, the skb contains the
54 packet to be sent (plus a great deal of extra info), and dev
55 contains the tunnel device that _we_ are.
56
57 When we are passed a packet, we are expected to fill in the
58 source address with our source IP address.
59
60 What is the proper way to allocate, copy and free a buffer?
61 After you allocate it, it is a "0 length" chunk of memory
62 starting at zero. If you want to add headers to the buffer
63 later, you'll have to call "skb_reserve(skb, amount)" with
64 the amount of memory you want reserved. Then, you call
65 "skb_put(skb, amount)" with the amount of space you want in
66 the buffer. skb_put() returns a pointer to the top (#0) of
67 that buffer. skb->len is set to the amount of space you have
68 "allocated" with skb_put(). You can then write up to skb->len
69 bytes to that buffer. If you need more, you can call skb_put()
70 again with the additional amount of space you need. You can
71 find out how much more space you can allocate by calling
72 "skb_tailroom(skb)".
73 Now, to add header space, call "skb_push(skb, header_len)".
74 This creates space at the beginning of the buffer and returns
75 a pointer to this new space. If later you need to strip a
76 header from a buffer, call "skb_pull(skb, header_len)".
77 skb_headroom() will return how much space is left at the top
78 of the buffer (before the main data). Remember, this headroom
79 space must be reserved before the skb_put() function is called.
80 */
81
82/*
83 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
84
85 For comments look at net/ipv4/ip_gre.c --ANK
86 */
87
88
89#include <linux/capability.h>
90#include <linux/module.h>
91#include <linux/types.h>
92#include <linux/kernel.h>
93#include <linux/slab.h>
94#include <linux/uaccess.h>
95#include <linux/skbuff.h>
96#include <linux/netdevice.h>
97#include <linux/in.h>
98#include <linux/tcp.h>
99#include <linux/udp.h>
100#include <linux/if_arp.h>
101#include <linux/init.h>
102#include <linux/netfilter_ipv4.h>
103#include <linux/if_ether.h>
104
105#include <net/sock.h>
106#include <net/ip.h>
107#include <net/icmp.h>
108#include <net/ip_tunnels.h>
109#include <net/inet_ecn.h>
110#include <net/xfrm.h>
111#include <net/net_namespace.h>
112#include <net/netns/generic.h>
113#include <net/dst_metadata.h>
114
115static bool log_ecn_error = true;
116module_param(log_ecn_error, bool, 0644);
117MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
118
119static unsigned int ipip_net_id __read_mostly;
120
121static int ipip_tunnel_init(struct net_device *dev);
122static struct rtnl_link_ops ipip_link_ops __read_mostly;
123
124static int ipip_err(struct sk_buff *skb, u32 info)
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 struct net *net = dev_net(skb->dev);
131 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
132 const struct iphdr *iph = (const struct iphdr *)skb->data;
133 const int type = icmp_hdr(skb)->type;
134 const int code = icmp_hdr(skb)->code;
135 struct ip_tunnel *t;
136 int err = 0;
137
138 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
139 iph->daddr, iph->saddr, 0);
140 if (!t) {
141 err = -ENOENT;
142 goto out;
143 }
144
145 switch (type) {
146 case ICMP_DEST_UNREACH:
147 switch (code) {
148 case ICMP_SR_FAILED:
149 /* Impossible event. */
150 goto out;
151 default:
152 /* All others are translated to HOST_UNREACH.
153 * rfc2003 contains "deep thoughts" about NET_UNREACH,
154 * I believe they are just ether pollution. --ANK
155 */
156 break;
157 }
158 break;
159
160 case ICMP_TIME_EXCEEDED:
161 if (code != ICMP_EXC_TTL)
162 goto out;
163 break;
164
165 case ICMP_REDIRECT:
166 break;
167
168 default:
169 goto out;
170 }
171
172 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
173 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol);
174 goto out;
175 }
176
177 if (type == ICMP_REDIRECT) {
178 ipv4_redirect(skb, net, t->parms.link, iph->protocol);
179 goto out;
180 }
181
182 if (t->parms.iph.daddr == 0) {
183 err = -ENOENT;
184 goto out;
185 }
186
187 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
188 goto out;
189
190 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
191 t->err_count++;
192 else
193 t->err_count = 1;
194 t->err_time = jiffies;
195
196out:
197 return err;
198}
199
200static const struct tnl_ptk_info ipip_tpi = {
201 /* no tunnel info required for ipip. */
202 .proto = htons(ETH_P_IP),
203};
204
205#if IS_ENABLED(CONFIG_MPLS)
206static const struct tnl_ptk_info mplsip_tpi = {
207 /* no tunnel info required for mplsip. */
208 .proto = htons(ETH_P_MPLS_UC),
209};
210#endif
211
212static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
213{
214 struct net *net = dev_net(skb->dev);
215 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
216 struct metadata_dst *tun_dst = NULL;
217 struct ip_tunnel *tunnel;
218 const struct iphdr *iph;
219
220 iph = ip_hdr(skb);
221 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
222 iph->saddr, iph->daddr, 0);
223 if (tunnel) {
224 const struct tnl_ptk_info *tpi;
225
226 if (tunnel->parms.iph.protocol != ipproto &&
227 tunnel->parms.iph.protocol != 0)
228 goto drop;
229
230 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
231 goto drop;
232#if IS_ENABLED(CONFIG_MPLS)
233 if (ipproto == IPPROTO_MPLS)
234 tpi = &mplsip_tpi;
235 else
236#endif
237 tpi = &ipip_tpi;
238 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
239 goto drop;
240 if (tunnel->collect_md) {
241 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
242 if (!tun_dst)
243 return 0;
244 }
245 skb_reset_mac_header(skb);
246
247 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
248 }
249
250 return -1;
251
252drop:
253 kfree_skb(skb);
254 return 0;
255}
256
257static int ipip_rcv(struct sk_buff *skb)
258{
259 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
260}
261
262#if IS_ENABLED(CONFIG_MPLS)
263static int mplsip_rcv(struct sk_buff *skb)
264{
265 return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
266}
267#endif
268
269/*
270 * This function assumes it is being called from dev_queue_xmit()
271 * and that skb is filled properly by that function.
272 */
273static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
274 struct net_device *dev)
275{
276 struct ip_tunnel *tunnel = netdev_priv(dev);
277 const struct iphdr *tiph = &tunnel->parms.iph;
278 u8 ipproto;
279
280 if (!pskb_inet_may_pull(skb))
281 goto tx_error;
282
283 switch (skb->protocol) {
284 case htons(ETH_P_IP):
285 ipproto = IPPROTO_IPIP;
286 break;
287#if IS_ENABLED(CONFIG_MPLS)
288 case htons(ETH_P_MPLS_UC):
289 ipproto = IPPROTO_MPLS;
290 break;
291#endif
292 default:
293 goto tx_error;
294 }
295
296 if (tiph->protocol != ipproto && tiph->protocol != 0)
297 goto tx_error;
298
299 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
300 goto tx_error;
301
302 skb_set_inner_ipproto(skb, ipproto);
303
304 if (tunnel->collect_md)
305 ip_md_tunnel_xmit(skb, dev, ipproto, 0);
306 else
307 ip_tunnel_xmit(skb, dev, tiph, ipproto);
308 return NETDEV_TX_OK;
309
310tx_error:
311 kfree_skb(skb);
312
313 dev->stats.tx_errors++;
314 return NETDEV_TX_OK;
315}
316
317static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
318{
319 switch (ipproto) {
320 case 0:
321 case IPPROTO_IPIP:
322#if IS_ENABLED(CONFIG_MPLS)
323 case IPPROTO_MPLS:
324#endif
325 return true;
326 }
327
328 return false;
329}
330
331static int
332ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
333{
334 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
335 if (p->iph.version != 4 ||
336 !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
337 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
338 return -EINVAL;
339 }
340
341 p->i_key = p->o_key = 0;
342 p->i_flags = p->o_flags = 0;
343 return ip_tunnel_ctl(dev, p, cmd);
344}
345
346static const struct net_device_ops ipip_netdev_ops = {
347 .ndo_init = ipip_tunnel_init,
348 .ndo_uninit = ip_tunnel_uninit,
349 .ndo_start_xmit = ipip_tunnel_xmit,
350 .ndo_do_ioctl = ip_tunnel_ioctl,
351 .ndo_change_mtu = ip_tunnel_change_mtu,
352 .ndo_get_stats64 = dev_get_tstats64,
353 .ndo_get_iflink = ip_tunnel_get_iflink,
354 .ndo_tunnel_ctl = ipip_tunnel_ctl,
355};
356
357#define IPIP_FEATURES (NETIF_F_SG | \
358 NETIF_F_FRAGLIST | \
359 NETIF_F_HIGHDMA | \
360 NETIF_F_GSO_SOFTWARE | \
361 NETIF_F_HW_CSUM)
362
363static void ipip_tunnel_setup(struct net_device *dev)
364{
365 dev->netdev_ops = &ipip_netdev_ops;
366 dev->header_ops = &ip_tunnel_header_ops;
367
368 dev->type = ARPHRD_TUNNEL;
369 dev->flags = IFF_NOARP;
370 dev->addr_len = 4;
371 dev->features |= NETIF_F_LLTX;
372 netif_keep_dst(dev);
373
374 dev->features |= IPIP_FEATURES;
375 dev->hw_features |= IPIP_FEATURES;
376 ip_tunnel_setup(dev, ipip_net_id);
377}
378
379static int ipip_tunnel_init(struct net_device *dev)
380{
381 struct ip_tunnel *tunnel = netdev_priv(dev);
382
383 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
384 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
385
386 tunnel->tun_hlen = 0;
387 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
388 return ip_tunnel_init(dev);
389}
390
391static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
392 struct netlink_ext_ack *extack)
393{
394 u8 proto;
395
396 if (!data || !data[IFLA_IPTUN_PROTO])
397 return 0;
398
399 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
400 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
401 return -EINVAL;
402
403 return 0;
404}
405
406static void ipip_netlink_parms(struct nlattr *data[],
407 struct ip_tunnel_parm *parms, bool *collect_md,
408 __u32 *fwmark)
409{
410 memset(parms, 0, sizeof(*parms));
411
412 parms->iph.version = 4;
413 parms->iph.protocol = IPPROTO_IPIP;
414 parms->iph.ihl = 5;
415 *collect_md = false;
416
417 if (!data)
418 return;
419
420 if (data[IFLA_IPTUN_LINK])
421 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
422
423 if (data[IFLA_IPTUN_LOCAL])
424 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
425
426 if (data[IFLA_IPTUN_REMOTE])
427 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
428
429 if (data[IFLA_IPTUN_TTL]) {
430 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
431 if (parms->iph.ttl)
432 parms->iph.frag_off = htons(IP_DF);
433 }
434
435 if (data[IFLA_IPTUN_TOS])
436 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
437
438 if (data[IFLA_IPTUN_PROTO])
439 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
440
441 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
442 parms->iph.frag_off = htons(IP_DF);
443
444 if (data[IFLA_IPTUN_COLLECT_METADATA])
445 *collect_md = true;
446
447 if (data[IFLA_IPTUN_FWMARK])
448 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
449}
450
451/* This function returns true when ENCAP attributes are present in the nl msg */
452static bool ipip_netlink_encap_parms(struct nlattr *data[],
453 struct ip_tunnel_encap *ipencap)
454{
455 bool ret = false;
456
457 memset(ipencap, 0, sizeof(*ipencap));
458
459 if (!data)
460 return ret;
461
462 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
463 ret = true;
464 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
465 }
466
467 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
468 ret = true;
469 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
470 }
471
472 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
473 ret = true;
474 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
475 }
476
477 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
478 ret = true;
479 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
480 }
481
482 return ret;
483}
484
485static int ipip_newlink(struct net *src_net, struct net_device *dev,
486 struct nlattr *tb[], struct nlattr *data[],
487 struct netlink_ext_ack *extack)
488{
489 struct ip_tunnel *t = netdev_priv(dev);
490 struct ip_tunnel_parm p;
491 struct ip_tunnel_encap ipencap;
492 __u32 fwmark = 0;
493
494 if (ipip_netlink_encap_parms(data, &ipencap)) {
495 int err = ip_tunnel_encap_setup(t, &ipencap);
496
497 if (err < 0)
498 return err;
499 }
500
501 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
502 return ip_tunnel_newlink(dev, tb, &p, fwmark);
503}
504
505static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
506 struct nlattr *data[],
507 struct netlink_ext_ack *extack)
508{
509 struct ip_tunnel *t = netdev_priv(dev);
510 struct ip_tunnel_parm p;
511 struct ip_tunnel_encap ipencap;
512 bool collect_md;
513 __u32 fwmark = t->fwmark;
514
515 if (ipip_netlink_encap_parms(data, &ipencap)) {
516 int err = ip_tunnel_encap_setup(t, &ipencap);
517
518 if (err < 0)
519 return err;
520 }
521
522 ipip_netlink_parms(data, &p, &collect_md, &fwmark);
523 if (collect_md)
524 return -EINVAL;
525
526 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
527 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
528 return -EINVAL;
529
530 return ip_tunnel_changelink(dev, tb, &p, fwmark);
531}
532
533static size_t ipip_get_size(const struct net_device *dev)
534{
535 return
536 /* IFLA_IPTUN_LINK */
537 nla_total_size(4) +
538 /* IFLA_IPTUN_LOCAL */
539 nla_total_size(4) +
540 /* IFLA_IPTUN_REMOTE */
541 nla_total_size(4) +
542 /* IFLA_IPTUN_TTL */
543 nla_total_size(1) +
544 /* IFLA_IPTUN_TOS */
545 nla_total_size(1) +
546 /* IFLA_IPTUN_PROTO */
547 nla_total_size(1) +
548 /* IFLA_IPTUN_PMTUDISC */
549 nla_total_size(1) +
550 /* IFLA_IPTUN_ENCAP_TYPE */
551 nla_total_size(2) +
552 /* IFLA_IPTUN_ENCAP_FLAGS */
553 nla_total_size(2) +
554 /* IFLA_IPTUN_ENCAP_SPORT */
555 nla_total_size(2) +
556 /* IFLA_IPTUN_ENCAP_DPORT */
557 nla_total_size(2) +
558 /* IFLA_IPTUN_COLLECT_METADATA */
559 nla_total_size(0) +
560 /* IFLA_IPTUN_FWMARK */
561 nla_total_size(4) +
562 0;
563}
564
565static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
566{
567 struct ip_tunnel *tunnel = netdev_priv(dev);
568 struct ip_tunnel_parm *parm = &tunnel->parms;
569
570 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
571 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
572 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
573 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
574 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
575 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
576 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
577 !!(parm->iph.frag_off & htons(IP_DF))) ||
578 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
579 goto nla_put_failure;
580
581 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
582 tunnel->encap.type) ||
583 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
584 tunnel->encap.sport) ||
585 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
586 tunnel->encap.dport) ||
587 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
588 tunnel->encap.flags))
589 goto nla_put_failure;
590
591 if (tunnel->collect_md)
592 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
593 goto nla_put_failure;
594 return 0;
595
596nla_put_failure:
597 return -EMSGSIZE;
598}
599
600static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
601 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
602 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
603 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
604 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
605 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
606 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
607 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
608 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
609 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
610 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
611 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
612 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
613 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
614};
615
616static struct rtnl_link_ops ipip_link_ops __read_mostly = {
617 .kind = "ipip",
618 .maxtype = IFLA_IPTUN_MAX,
619 .policy = ipip_policy,
620 .priv_size = sizeof(struct ip_tunnel),
621 .setup = ipip_tunnel_setup,
622 .validate = ipip_tunnel_validate,
623 .newlink = ipip_newlink,
624 .changelink = ipip_changelink,
625 .dellink = ip_tunnel_dellink,
626 .get_size = ipip_get_size,
627 .fill_info = ipip_fill_info,
628 .get_link_net = ip_tunnel_get_link_net,
629};
630
631static struct xfrm_tunnel ipip_handler __read_mostly = {
632 .handler = ipip_rcv,
633 .err_handler = ipip_err,
634 .priority = 1,
635};
636
637#if IS_ENABLED(CONFIG_MPLS)
638static struct xfrm_tunnel mplsip_handler __read_mostly = {
639 .handler = mplsip_rcv,
640 .err_handler = ipip_err,
641 .priority = 1,
642};
643#endif
644
645static int __net_init ipip_init_net(struct net *net)
646{
647 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
648}
649
650static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
651{
652 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
653}
654
655static struct pernet_operations ipip_net_ops = {
656 .init = ipip_init_net,
657 .exit_batch = ipip_exit_batch_net,
658 .id = &ipip_net_id,
659 .size = sizeof(struct ip_tunnel_net),
660};
661
662static int __init ipip_init(void)
663{
664 int err;
665
666 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
667
668 err = register_pernet_device(&ipip_net_ops);
669 if (err < 0)
670 return err;
671 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
672 if (err < 0) {
673 pr_info("%s: can't register tunnel\n", __func__);
674 goto xfrm_tunnel_ipip_failed;
675 }
676#if IS_ENABLED(CONFIG_MPLS)
677 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
678 if (err < 0) {
679 pr_info("%s: can't register tunnel\n", __func__);
680 goto xfrm_tunnel_mplsip_failed;
681 }
682#endif
683 err = rtnl_link_register(&ipip_link_ops);
684 if (err < 0)
685 goto rtnl_link_failed;
686
687out:
688 return err;
689
690rtnl_link_failed:
691#if IS_ENABLED(CONFIG_MPLS)
692 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
693xfrm_tunnel_mplsip_failed:
694
695#endif
696 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
697xfrm_tunnel_ipip_failed:
698 unregister_pernet_device(&ipip_net_ops);
699 goto out;
700}
701
702static void __exit ipip_fini(void)
703{
704 rtnl_link_unregister(&ipip_link_ops);
705 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
706 pr_info("%s: can't deregister tunnel\n", __func__);
707#if IS_ENABLED(CONFIG_MPLS)
708 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
709 pr_info("%s: can't deregister tunnel\n", __func__);
710#endif
711 unregister_pernet_device(&ipip_net_ops);
712}
713
714module_init(ipip_init);
715module_exit(ipip_fini);
716MODULE_LICENSE("GPL");
717MODULE_ALIAS_RTNL_LINK("ipip");
718MODULE_ALIAS_NETDEV("tunl0");
1/*
2 * Linux NET3: IP/IP protocol decoder.
3 *
4 * Authors:
5 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
6 *
7 * Fixes:
8 * Alan Cox : Merged and made usable non modular (its so tiny its silly as
9 * a module taking up 2 pages).
10 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
11 * to keep ip_forward happy.
12 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
13 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
14 * David Woodhouse : Perform some basic ICMP handling.
15 * IPIP Routing without decapsulation.
16 * Carlos Picoto : GRE over IP support
17 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
18 * I do not want to merge them together.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 *
25 */
26
27/* tunnel.c: an IP tunnel driver
28
29 The purpose of this driver is to provide an IP tunnel through
30 which you can tunnel network traffic transparently across subnets.
31
32 This was written by looking at Nick Holloway's dummy driver
33 Thanks for the great code!
34
35 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
36
37 Minor tweaks:
38 Cleaned up the code a little and added some pre-1.3.0 tweaks.
39 dev->hard_header/hard_header_len changed to use no headers.
40 Comments/bracketing tweaked.
41 Made the tunnels use dev->name not tunnel: when error reporting.
42 Added tx_dropped stat
43
44 -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95
45
46 Reworked:
47 Changed to tunnel to destination gateway in addition to the
48 tunnel's pointopoint address
49 Almost completely rewritten
50 Note: There is currently no firewall or ICMP handling done.
51
52 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96
53
54*/
55
56/* Things I wish I had known when writing the tunnel driver:
57
58 When the tunnel_xmit() function is called, the skb contains the
59 packet to be sent (plus a great deal of extra info), and dev
60 contains the tunnel device that _we_ are.
61
62 When we are passed a packet, we are expected to fill in the
63 source address with our source IP address.
64
65 What is the proper way to allocate, copy and free a buffer?
66 After you allocate it, it is a "0 length" chunk of memory
67 starting at zero. If you want to add headers to the buffer
68 later, you'll have to call "skb_reserve(skb, amount)" with
69 the amount of memory you want reserved. Then, you call
70 "skb_put(skb, amount)" with the amount of space you want in
71 the buffer. skb_put() returns a pointer to the top (#0) of
72 that buffer. skb->len is set to the amount of space you have
73 "allocated" with skb_put(). You can then write up to skb->len
74 bytes to that buffer. If you need more, you can call skb_put()
75 again with the additional amount of space you need. You can
76 find out how much more space you can allocate by calling
77 "skb_tailroom(skb)".
78 Now, to add header space, call "skb_push(skb, header_len)".
79 This creates space at the beginning of the buffer and returns
80 a pointer to this new space. If later you need to strip a
81 header from a buffer, call "skb_pull(skb, header_len)".
82 skb_headroom() will return how much space is left at the top
83 of the buffer (before the main data). Remember, this headroom
84 space must be reserved before the skb_put() function is called.
85 */
86
87/*
88 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
89
90 For comments look at net/ipv4/ip_gre.c --ANK
91 */
92
93
94#include <linux/capability.h>
95#include <linux/module.h>
96#include <linux/types.h>
97#include <linux/kernel.h>
98#include <linux/slab.h>
99#include <linux/uaccess.h>
100#include <linux/skbuff.h>
101#include <linux/netdevice.h>
102#include <linux/in.h>
103#include <linux/tcp.h>
104#include <linux/udp.h>
105#include <linux/if_arp.h>
106#include <linux/init.h>
107#include <linux/netfilter_ipv4.h>
108#include <linux/if_ether.h>
109
110#include <net/sock.h>
111#include <net/ip.h>
112#include <net/icmp.h>
113#include <net/ip_tunnels.h>
114#include <net/inet_ecn.h>
115#include <net/xfrm.h>
116#include <net/net_namespace.h>
117#include <net/netns/generic.h>
118#include <net/dst_metadata.h>
119
120static bool log_ecn_error = true;
121module_param(log_ecn_error, bool, 0644);
122MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
123
124static unsigned int ipip_net_id __read_mostly;
125
126static int ipip_tunnel_init(struct net_device *dev);
127static struct rtnl_link_ops ipip_link_ops __read_mostly;
128
129static int ipip_err(struct sk_buff *skb, u32 info)
130{
131
132/* All the routers (except for Linux) return only
133 8 bytes of packet payload. It means, that precise relaying of
134 ICMP in the real Internet is absolutely infeasible.
135 */
136 struct net *net = dev_net(skb->dev);
137 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
138 const struct iphdr *iph = (const struct iphdr *)skb->data;
139 struct ip_tunnel *t;
140 int err;
141 const int type = icmp_hdr(skb)->type;
142 const int code = icmp_hdr(skb)->code;
143
144 err = -ENOENT;
145 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
146 iph->daddr, iph->saddr, 0);
147 if (!t)
148 goto out;
149
150 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
151 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
152 t->parms.link, 0, iph->protocol, 0);
153 err = 0;
154 goto out;
155 }
156
157 if (type == ICMP_REDIRECT) {
158 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
159 iph->protocol, 0);
160 err = 0;
161 goto out;
162 }
163
164 if (t->parms.iph.daddr == 0)
165 goto out;
166
167 err = 0;
168 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
169 goto out;
170
171 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
172 t->err_count++;
173 else
174 t->err_count = 1;
175 t->err_time = jiffies;
176
177out:
178 return err;
179}
180
181static const struct tnl_ptk_info ipip_tpi = {
182 /* no tunnel info required for ipip. */
183 .proto = htons(ETH_P_IP),
184};
185
186#if IS_ENABLED(CONFIG_MPLS)
187static const struct tnl_ptk_info mplsip_tpi = {
188 /* no tunnel info required for mplsip. */
189 .proto = htons(ETH_P_MPLS_UC),
190};
191#endif
192
193static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
194{
195 struct net *net = dev_net(skb->dev);
196 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
197 struct metadata_dst *tun_dst = NULL;
198 struct ip_tunnel *tunnel;
199 const struct iphdr *iph;
200
201 iph = ip_hdr(skb);
202 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
203 iph->saddr, iph->daddr, 0);
204 if (tunnel) {
205 const struct tnl_ptk_info *tpi;
206
207 if (tunnel->parms.iph.protocol != ipproto &&
208 tunnel->parms.iph.protocol != 0)
209 goto drop;
210
211 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
212 goto drop;
213#if IS_ENABLED(CONFIG_MPLS)
214 if (ipproto == IPPROTO_MPLS)
215 tpi = &mplsip_tpi;
216 else
217#endif
218 tpi = &ipip_tpi;
219 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
220 goto drop;
221 if (tunnel->collect_md) {
222 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
223 if (!tun_dst)
224 return 0;
225 }
226 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
227 }
228
229 return -1;
230
231drop:
232 kfree_skb(skb);
233 return 0;
234}
235
236static int ipip_rcv(struct sk_buff *skb)
237{
238 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
239}
240
241#if IS_ENABLED(CONFIG_MPLS)
242static int mplsip_rcv(struct sk_buff *skb)
243{
244 return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
245}
246#endif
247
248/*
249 * This function assumes it is being called from dev_queue_xmit()
250 * and that skb is filled properly by that function.
251 */
252static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
253 struct net_device *dev)
254{
255 struct ip_tunnel *tunnel = netdev_priv(dev);
256 const struct iphdr *tiph = &tunnel->parms.iph;
257 u8 ipproto;
258
259 switch (skb->protocol) {
260 case htons(ETH_P_IP):
261 ipproto = IPPROTO_IPIP;
262 break;
263#if IS_ENABLED(CONFIG_MPLS)
264 case htons(ETH_P_MPLS_UC):
265 ipproto = IPPROTO_MPLS;
266 break;
267#endif
268 default:
269 goto tx_error;
270 }
271
272 if (tiph->protocol != ipproto && tiph->protocol != 0)
273 goto tx_error;
274
275 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
276 goto tx_error;
277
278 skb_set_inner_ipproto(skb, ipproto);
279
280 if (tunnel->collect_md)
281 ip_md_tunnel_xmit(skb, dev, ipproto);
282 else
283 ip_tunnel_xmit(skb, dev, tiph, ipproto);
284 return NETDEV_TX_OK;
285
286tx_error:
287 kfree_skb(skb);
288
289 dev->stats.tx_errors++;
290 return NETDEV_TX_OK;
291}
292
293static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
294{
295 switch (ipproto) {
296 case 0:
297 case IPPROTO_IPIP:
298#if IS_ENABLED(CONFIG_MPLS)
299 case IPPROTO_MPLS:
300#endif
301 return true;
302 }
303
304 return false;
305}
306
307static int
308ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
309{
310 int err = 0;
311 struct ip_tunnel_parm p;
312
313 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
314 return -EFAULT;
315
316 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
317 if (p.iph.version != 4 ||
318 !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) ||
319 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
320 return -EINVAL;
321 }
322
323 p.i_key = p.o_key = 0;
324 p.i_flags = p.o_flags = 0;
325 err = ip_tunnel_ioctl(dev, &p, cmd);
326 if (err)
327 return err;
328
329 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
330 return -EFAULT;
331
332 return 0;
333}
334
335static const struct net_device_ops ipip_netdev_ops = {
336 .ndo_init = ipip_tunnel_init,
337 .ndo_uninit = ip_tunnel_uninit,
338 .ndo_start_xmit = ipip_tunnel_xmit,
339 .ndo_do_ioctl = ipip_tunnel_ioctl,
340 .ndo_change_mtu = ip_tunnel_change_mtu,
341 .ndo_get_stats64 = ip_tunnel_get_stats64,
342 .ndo_get_iflink = ip_tunnel_get_iflink,
343};
344
345#define IPIP_FEATURES (NETIF_F_SG | \
346 NETIF_F_FRAGLIST | \
347 NETIF_F_HIGHDMA | \
348 NETIF_F_GSO_SOFTWARE | \
349 NETIF_F_HW_CSUM)
350
351static void ipip_tunnel_setup(struct net_device *dev)
352{
353 dev->netdev_ops = &ipip_netdev_ops;
354
355 dev->type = ARPHRD_TUNNEL;
356 dev->flags = IFF_NOARP;
357 dev->addr_len = 4;
358 dev->features |= NETIF_F_LLTX;
359 netif_keep_dst(dev);
360
361 dev->features |= IPIP_FEATURES;
362 dev->hw_features |= IPIP_FEATURES;
363 ip_tunnel_setup(dev, ipip_net_id);
364}
365
366static int ipip_tunnel_init(struct net_device *dev)
367{
368 struct ip_tunnel *tunnel = netdev_priv(dev);
369
370 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
371 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
372
373 tunnel->tun_hlen = 0;
374 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
375 return ip_tunnel_init(dev);
376}
377
378static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
379{
380 u8 proto;
381
382 if (!data || !data[IFLA_IPTUN_PROTO])
383 return 0;
384
385 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
386 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
387 return -EINVAL;
388
389 return 0;
390}
391
392static void ipip_netlink_parms(struct nlattr *data[],
393 struct ip_tunnel_parm *parms, bool *collect_md)
394{
395 memset(parms, 0, sizeof(*parms));
396
397 parms->iph.version = 4;
398 parms->iph.protocol = IPPROTO_IPIP;
399 parms->iph.ihl = 5;
400 *collect_md = false;
401
402 if (!data)
403 return;
404
405 if (data[IFLA_IPTUN_LINK])
406 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
407
408 if (data[IFLA_IPTUN_LOCAL])
409 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
410
411 if (data[IFLA_IPTUN_REMOTE])
412 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
413
414 if (data[IFLA_IPTUN_TTL]) {
415 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
416 if (parms->iph.ttl)
417 parms->iph.frag_off = htons(IP_DF);
418 }
419
420 if (data[IFLA_IPTUN_TOS])
421 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
422
423 if (data[IFLA_IPTUN_PROTO])
424 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
425
426 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
427 parms->iph.frag_off = htons(IP_DF);
428
429 if (data[IFLA_IPTUN_COLLECT_METADATA])
430 *collect_md = true;
431}
432
433/* This function returns true when ENCAP attributes are present in the nl msg */
434static bool ipip_netlink_encap_parms(struct nlattr *data[],
435 struct ip_tunnel_encap *ipencap)
436{
437 bool ret = false;
438
439 memset(ipencap, 0, sizeof(*ipencap));
440
441 if (!data)
442 return ret;
443
444 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
445 ret = true;
446 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
447 }
448
449 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
450 ret = true;
451 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
452 }
453
454 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
455 ret = true;
456 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
457 }
458
459 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
460 ret = true;
461 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
462 }
463
464 return ret;
465}
466
467static int ipip_newlink(struct net *src_net, struct net_device *dev,
468 struct nlattr *tb[], struct nlattr *data[])
469{
470 struct ip_tunnel *t = netdev_priv(dev);
471 struct ip_tunnel_parm p;
472 struct ip_tunnel_encap ipencap;
473
474 if (ipip_netlink_encap_parms(data, &ipencap)) {
475 int err = ip_tunnel_encap_setup(t, &ipencap);
476
477 if (err < 0)
478 return err;
479 }
480
481 ipip_netlink_parms(data, &p, &t->collect_md);
482 return ip_tunnel_newlink(dev, tb, &p);
483}
484
485static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
486 struct nlattr *data[])
487{
488 struct ip_tunnel_parm p;
489 struct ip_tunnel_encap ipencap;
490 bool collect_md;
491
492 if (ipip_netlink_encap_parms(data, &ipencap)) {
493 struct ip_tunnel *t = netdev_priv(dev);
494 int err = ip_tunnel_encap_setup(t, &ipencap);
495
496 if (err < 0)
497 return err;
498 }
499
500 ipip_netlink_parms(data, &p, &collect_md);
501 if (collect_md)
502 return -EINVAL;
503
504 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
505 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
506 return -EINVAL;
507
508 return ip_tunnel_changelink(dev, tb, &p);
509}
510
511static size_t ipip_get_size(const struct net_device *dev)
512{
513 return
514 /* IFLA_IPTUN_LINK */
515 nla_total_size(4) +
516 /* IFLA_IPTUN_LOCAL */
517 nla_total_size(4) +
518 /* IFLA_IPTUN_REMOTE */
519 nla_total_size(4) +
520 /* IFLA_IPTUN_TTL */
521 nla_total_size(1) +
522 /* IFLA_IPTUN_TOS */
523 nla_total_size(1) +
524 /* IFLA_IPTUN_PROTO */
525 nla_total_size(1) +
526 /* IFLA_IPTUN_PMTUDISC */
527 nla_total_size(1) +
528 /* IFLA_IPTUN_ENCAP_TYPE */
529 nla_total_size(2) +
530 /* IFLA_IPTUN_ENCAP_FLAGS */
531 nla_total_size(2) +
532 /* IFLA_IPTUN_ENCAP_SPORT */
533 nla_total_size(2) +
534 /* IFLA_IPTUN_ENCAP_DPORT */
535 nla_total_size(2) +
536 /* IFLA_IPTUN_COLLECT_METADATA */
537 nla_total_size(0) +
538 0;
539}
540
541static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
542{
543 struct ip_tunnel *tunnel = netdev_priv(dev);
544 struct ip_tunnel_parm *parm = &tunnel->parms;
545
546 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
547 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
548 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
549 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
550 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
551 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
552 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
553 !!(parm->iph.frag_off & htons(IP_DF))))
554 goto nla_put_failure;
555
556 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
557 tunnel->encap.type) ||
558 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
559 tunnel->encap.sport) ||
560 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
561 tunnel->encap.dport) ||
562 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
563 tunnel->encap.flags))
564 goto nla_put_failure;
565
566 if (tunnel->collect_md)
567 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
568 goto nla_put_failure;
569 return 0;
570
571nla_put_failure:
572 return -EMSGSIZE;
573}
574
575static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
576 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
577 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
578 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
579 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
580 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
581 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
582 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
583 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
584 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
585 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
586 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
587 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
588};
589
590static struct rtnl_link_ops ipip_link_ops __read_mostly = {
591 .kind = "ipip",
592 .maxtype = IFLA_IPTUN_MAX,
593 .policy = ipip_policy,
594 .priv_size = sizeof(struct ip_tunnel),
595 .setup = ipip_tunnel_setup,
596 .validate = ipip_tunnel_validate,
597 .newlink = ipip_newlink,
598 .changelink = ipip_changelink,
599 .dellink = ip_tunnel_dellink,
600 .get_size = ipip_get_size,
601 .fill_info = ipip_fill_info,
602 .get_link_net = ip_tunnel_get_link_net,
603};
604
605static struct xfrm_tunnel ipip_handler __read_mostly = {
606 .handler = ipip_rcv,
607 .err_handler = ipip_err,
608 .priority = 1,
609};
610
611#if IS_ENABLED(CONFIG_MPLS)
612static struct xfrm_tunnel mplsip_handler __read_mostly = {
613 .handler = mplsip_rcv,
614 .err_handler = ipip_err,
615 .priority = 1,
616};
617#endif
618
619static int __net_init ipip_init_net(struct net *net)
620{
621 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
622}
623
624static void __net_exit ipip_exit_net(struct net *net)
625{
626 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
627 ip_tunnel_delete_net(itn, &ipip_link_ops);
628}
629
630static struct pernet_operations ipip_net_ops = {
631 .init = ipip_init_net,
632 .exit = ipip_exit_net,
633 .id = &ipip_net_id,
634 .size = sizeof(struct ip_tunnel_net),
635};
636
637static int __init ipip_init(void)
638{
639 int err;
640
641 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
642
643 err = register_pernet_device(&ipip_net_ops);
644 if (err < 0)
645 return err;
646 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
647 if (err < 0) {
648 pr_info("%s: can't register tunnel\n", __func__);
649 goto xfrm_tunnel_ipip_failed;
650 }
651#if IS_ENABLED(CONFIG_MPLS)
652 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
653 if (err < 0) {
654 pr_info("%s: can't register tunnel\n", __func__);
655 goto xfrm_tunnel_mplsip_failed;
656 }
657#endif
658 err = rtnl_link_register(&ipip_link_ops);
659 if (err < 0)
660 goto rtnl_link_failed;
661
662out:
663 return err;
664
665rtnl_link_failed:
666#if IS_ENABLED(CONFIG_MPLS)
667 xfrm4_tunnel_deregister(&mplsip_handler, AF_INET);
668xfrm_tunnel_mplsip_failed:
669
670#endif
671 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
672xfrm_tunnel_ipip_failed:
673 unregister_pernet_device(&ipip_net_ops);
674 goto out;
675}
676
677static void __exit ipip_fini(void)
678{
679 rtnl_link_unregister(&ipip_link_ops);
680 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
681 pr_info("%s: can't deregister tunnel\n", __func__);
682#if IS_ENABLED(CONFIG_MPLS)
683 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
684 pr_info("%s: can't deregister tunnel\n", __func__);
685#endif
686 unregister_pernet_device(&ipip_net_ops);
687}
688
689module_init(ipip_init);
690module_exit(ipip_fini);
691MODULE_LICENSE("GPL");
692MODULE_ALIAS_RTNL_LINK("ipip");
693MODULE_ALIAS_NETDEV("tunl0");