2 * Linux NET3: IP/IP protocol decoder modified to support
3 * virtual tunnel interface
6 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
18 For comments look at net/ipv4/ip_gre.c --ANK
22 #include <linux/capability.h>
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/kernel.h>
26 #include <linux/uaccess.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
30 #include <linux/tcp.h>
31 #include <linux/udp.h>
32 #include <linux/if_arp.h>
33 #include <linux/mroute.h>
34 #include <linux/init.h>
35 #include <linux/netfilter_ipv4.h>
36 #include <linux/if_ether.h>
37 #include <linux/icmpv6.h>
42 #include <net/ip_tunnels.h>
43 #include <net/inet_ecn.h>
45 #include <net/net_namespace.h>
46 #include <net/netns/generic.h>
48 static struct rtnl_link_ops vti_link_ops __read_mostly;
50 static int vti_net_id __read_mostly;
51 static int vti_tunnel_init(struct net_device *dev);
53 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
56 struct ip_tunnel *tunnel;
57 const struct iphdr *iph = ip_hdr(skb);
58 struct net *net = dev_net(skb->dev);
59 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
61 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
62 iph->saddr, iph->daddr, 0);
64 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
67 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
68 skb->mark = be32_to_cpu(tunnel->parms.i_key);
70 return xfrm_input(skb, nexthdr, spi, encap_type);
79 static int vti_rcv(struct sk_buff *skb)
81 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
82 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
84 return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
87 static int vti_rcv_cb(struct sk_buff *skb, int err)
89 unsigned short family;
90 struct net_device *dev;
91 struct pcpu_sw_netstats *tstats;
93 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
101 dev->stats.rx_errors++;
102 dev->stats.rx_dropped++;
107 x = xfrm_input_state(skb);
108 family = x->inner_mode->afinfo->family;
110 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
113 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
116 tstats = this_cpu_ptr(dev->tstats);
118 u64_stats_update_begin(&tstats->syncp);
119 tstats->rx_packets++;
120 tstats->rx_bytes += skb->len;
121 u64_stats_update_end(&tstats->syncp);
126 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
128 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
129 xfrm_address_t *saddr = (xfrm_address_t *)&src;
131 /* if there is no transform then this tunnel is not functional.
132 * Or if the xfrm is not mode tunnel.
134 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
135 x->props.family != AF_INET)
139 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
141 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
147 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
150 struct ip_tunnel *tunnel = netdev_priv(dev);
151 struct ip_tunnel_parm *parms = &tunnel->parms;
152 struct dst_entry *dst = skb_dst(skb);
153 struct net_device *tdev; /* Device to other host */
157 dev->stats.tx_carrier_errors++;
162 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
164 dev->stats.tx_carrier_errors++;
168 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
169 dev->stats.tx_carrier_errors++;
178 dev->stats.collisions++;
182 if (tunnel->err_count > 0) {
183 if (time_before(jiffies,
184 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
186 dst_link_failure(skb);
188 tunnel->err_count = 0;
191 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
192 skb_dst_set(skb, dst);
193 skb->dev = skb_dst(skb)->dev;
195 err = dst_output(skb);
196 if (net_xmit_eval(err) == 0)
198 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
202 dst_link_failure(skb);
204 dev->stats.tx_errors++;
209 /* This function assumes it is being called from dev_queue_xmit()
210 * and that skb is filled properly by that function.
212 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
214 struct ip_tunnel *tunnel = netdev_priv(dev);
217 memset(&fl, 0, sizeof(fl));
219 skb->mark = be32_to_cpu(tunnel->parms.o_key);
221 switch (skb->protocol) {
222 case htons(ETH_P_IP):
223 xfrm_decode_session(skb, &fl, AF_INET);
224 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
226 case htons(ETH_P_IPV6):
227 xfrm_decode_session(skb, &fl, AF_INET6);
228 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
231 dev->stats.tx_errors++;
236 return vti_xmit(skb, dev, &fl);
239 static int vti4_err(struct sk_buff *skb, u32 info)
242 struct xfrm_state *x;
243 struct ip_tunnel *tunnel;
244 struct ip_esp_hdr *esph;
245 struct ip_auth_hdr *ah ;
246 struct ip_comp_hdr *ipch;
247 struct net *net = dev_net(skb->dev);
248 const struct iphdr *iph = (const struct iphdr *)skb->data;
249 int protocol = iph->protocol;
250 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
252 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
253 iph->daddr, iph->saddr, 0);
259 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
263 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
267 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
268 spi = htonl(ntohs(ipch->cpi));
274 switch (icmp_hdr(skb)->type) {
275 case ICMP_DEST_UNREACH:
276 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
284 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
285 spi, protocol, AF_INET);
289 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
290 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
292 ipv4_redirect(skb, net, 0, 0, protocol, 0);
299 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
302 struct ip_tunnel_parm p;
304 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
307 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
308 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
313 p.i_flags |= VTI_ISVTI;
314 err = ip_tunnel_ioctl(dev, &p, cmd);
318 if (cmd != SIOCDELTUNNEL) {
319 p.i_flags |= GRE_KEY;
320 p.o_flags |= GRE_KEY;
323 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
328 static const struct net_device_ops vti_netdev_ops = {
329 .ndo_init = vti_tunnel_init,
330 .ndo_uninit = ip_tunnel_uninit,
331 .ndo_start_xmit = vti_tunnel_xmit,
332 .ndo_do_ioctl = vti_tunnel_ioctl,
333 .ndo_change_mtu = ip_tunnel_change_mtu,
334 .ndo_get_stats64 = ip_tunnel_get_stats64,
337 static void vti_tunnel_setup(struct net_device *dev)
339 dev->netdev_ops = &vti_netdev_ops;
340 ip_tunnel_setup(dev, vti_net_id);
343 static int vti_tunnel_init(struct net_device *dev)
345 struct ip_tunnel *tunnel = netdev_priv(dev);
346 struct iphdr *iph = &tunnel->parms.iph;
348 memcpy(dev->dev_addr, &iph->saddr, 4);
349 memcpy(dev->broadcast, &iph->daddr, 4);
351 dev->type = ARPHRD_TUNNEL;
352 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
353 dev->mtu = ETH_DATA_LEN;
354 dev->flags = IFF_NOARP;
357 dev->features |= NETIF_F_NETNS_LOCAL;
358 dev->features |= NETIF_F_LLTX;
359 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
361 return ip_tunnel_init(dev);
364 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
366 struct ip_tunnel *tunnel = netdev_priv(dev);
367 struct iphdr *iph = &tunnel->parms.iph;
370 iph->protocol = IPPROTO_IPIP;
374 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
376 .input_handler = vti_input,
377 .cb_handler = vti_rcv_cb,
378 .err_handler = vti4_err,
382 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
384 .input_handler = vti_input,
385 .cb_handler = vti_rcv_cb,
386 .err_handler = vti4_err,
390 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
392 .input_handler = vti_input,
393 .cb_handler = vti_rcv_cb,
394 .err_handler = vti4_err,
398 static int __net_init vti_init_net(struct net *net)
401 struct ip_tunnel_net *itn;
403 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
406 itn = net_generic(net, vti_net_id);
407 vti_fb_tunnel_init(itn->fb_tunnel_dev);
411 static void __net_exit vti_exit_net(struct net *net)
413 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
414 ip_tunnel_delete_net(itn, &vti_link_ops);
417 static struct pernet_operations vti_net_ops = {
418 .init = vti_init_net,
419 .exit = vti_exit_net,
421 .size = sizeof(struct ip_tunnel_net),
424 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
429 static void vti_netlink_parms(struct nlattr *data[],
430 struct ip_tunnel_parm *parms)
432 memset(parms, 0, sizeof(*parms));
434 parms->iph.protocol = IPPROTO_IPIP;
439 parms->i_flags = VTI_ISVTI;
441 if (data[IFLA_VTI_LINK])
442 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
444 if (data[IFLA_VTI_IKEY])
445 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
447 if (data[IFLA_VTI_OKEY])
448 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
450 if (data[IFLA_VTI_LOCAL])
451 parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
453 if (data[IFLA_VTI_REMOTE])
454 parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
458 static int vti_newlink(struct net *src_net, struct net_device *dev,
459 struct nlattr *tb[], struct nlattr *data[])
461 struct ip_tunnel_parm parms;
463 vti_netlink_parms(data, &parms);
464 return ip_tunnel_newlink(dev, tb, &parms);
467 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
468 struct nlattr *data[])
470 struct ip_tunnel_parm p;
472 vti_netlink_parms(data, &p);
473 return ip_tunnel_changelink(dev, tb, &p);
476 static size_t vti_get_size(const struct net_device *dev)
487 /* IFLA_VTI_REMOTE */
492 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
494 struct ip_tunnel *t = netdev_priv(dev);
495 struct ip_tunnel_parm *p = &t->parms;
497 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
498 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
499 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
500 nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
501 nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
506 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
507 [IFLA_VTI_LINK] = { .type = NLA_U32 },
508 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
509 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
510 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
511 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
514 static struct rtnl_link_ops vti_link_ops __read_mostly = {
516 .maxtype = IFLA_VTI_MAX,
517 .policy = vti_policy,
518 .priv_size = sizeof(struct ip_tunnel),
519 .setup = vti_tunnel_setup,
520 .validate = vti_tunnel_validate,
521 .newlink = vti_newlink,
522 .changelink = vti_changelink,
523 .get_size = vti_get_size,
524 .fill_info = vti_fill_info,
527 static int __init vti_init(void)
531 pr_info("IPv4 over IPSec tunneling driver\n");
533 err = register_pernet_device(&vti_net_ops);
536 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
538 unregister_pernet_device(&vti_net_ops);
539 pr_info("vti init: can't register tunnel\n");
544 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
546 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
547 unregister_pernet_device(&vti_net_ops);
548 pr_info("vti init: can't register tunnel\n");
553 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
555 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
556 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
557 unregister_pernet_device(&vti_net_ops);
558 pr_info("vti init: can't register tunnel\n");
563 err = rtnl_link_register(&vti_link_ops);
565 goto rtnl_link_failed;
570 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
571 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
572 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
573 unregister_pernet_device(&vti_net_ops);
577 static void __exit vti_fini(void)
579 rtnl_link_unregister(&vti_link_ops);
580 if (xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP))
581 pr_info("vti close: can't deregister tunnel\n");
582 if (xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH))
583 pr_info("vti close: can't deregister tunnel\n");
584 if (xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP))
585 pr_info("vti close: can't deregister tunnel\n");
588 unregister_pernet_device(&vti_net_ops);
591 module_init(vti_init);
592 module_exit(vti_fini);
593 MODULE_LICENSE("GPL");
594 MODULE_ALIAS_RTNL_LINK("vti");
595 MODULE_ALIAS_NETDEV("ip_vti0");