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Linux/net/ipv4/ipip.c

  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 <asm/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 
120 static bool log_ecn_error = true;
121 module_param(log_ecn_error, bool, 0644);
122 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
123 
124 static int ipip_net_id __read_mostly;
125 
126 static int ipip_tunnel_init(struct net_device *dev);
127 static struct rtnl_link_ops ipip_link_ops __read_mostly;
128 
129 static 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 
177 out:
178         return err;
179 }
180 
181 static 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)
187 static 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 
193 static 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 
231 drop:
232         kfree_skb(skb);
233         return 0;
234 }
235 
236 static int ipip_rcv(struct sk_buff *skb)
237 {
238         return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
239 }
240 
241 #if IS_ENABLED(CONFIG_MPLS)
242 static 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  */
252 static 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 
286 tx_error:
287         kfree_skb(skb);
288 
289         dev->stats.tx_errors++;
290         return NETDEV_TX_OK;
291 }
292 
293 static 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 
307 static int
308 ipip_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 
335 static 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 
351 static 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 
366 static 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 
378 static 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 
392 static 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 */
434 static 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 
467 static 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 
485 static 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 
511 static 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 
541 static 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 
571 nla_put_failure:
572         return -EMSGSIZE;
573 }
574 
575 static 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 
590 static 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 
605 static 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)
612 static struct xfrm_tunnel mplsip_handler __read_mostly = {
613         .handler        =       mplsip_rcv,
614         .err_handler    =       ipip_err,
615         .priority       =       1,
616 };
617 #endif
618 
619 static 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 
624 static 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 
630 static 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 
637 static 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 
662 out:
663         return err;
664 
665 rtnl_link_failed:
666 #if IS_ENABLED(CONFIG_MPLS)
667         xfrm4_tunnel_deregister(&mplsip_handler, AF_INET);
668 xfrm_tunnel_mplsip_failed:
669 
670 #endif
671         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
672 xfrm_tunnel_ipip_failed:
673         unregister_pernet_device(&ipip_net_ops);
674         goto out;
675 }
676 
677 static 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 
689 module_init(ipip_init);
690 module_exit(ipip_fini);
691 MODULE_LICENSE("GPL");
692 MODULE_ALIAS_RTNL_LINK("ipip");
693 MODULE_ALIAS_NETDEV("tunl0");
694 

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