1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 tunneling device
4 * Linux INET6 implementation
7 * Ville Nuorvala <vnuorval@tcs.hut.fi>
8 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/sockios.h>
23 #include <linux/icmp.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/icmpv6.h>
32 #include <linux/init.h>
33 #include <linux/route.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/netfilter_ipv6.h>
36 #include <linux/slab.h>
37 #include <linux/hash.h>
38 #include <linux/etherdevice.h>
40 #include <linux/uaccess.h>
41 #include <linux/atomic.h>
45 #include <net/ip_tunnels.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
51 #include <net/dsfield.h>
52 #include <net/inet_ecn.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55 #include <net/dst_metadata.h>
57 MODULE_AUTHOR("Ville Nuorvala");
58 MODULE_DESCRIPTION("IPv6 tunneling device");
59 MODULE_LICENSE("GPL");
60 MODULE_ALIAS_RTNL_LINK("ip6tnl");
61 MODULE_ALIAS_NETDEV("ip6tnl0");
63 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
64 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
66 static bool log_ecn_error = true;
67 module_param(log_ecn_error, bool, 0644);
68 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
70 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
72 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
74 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
77 static int ip6_tnl_dev_init(struct net_device *dev);
78 static void ip6_tnl_dev_setup(struct net_device *dev);
79 static struct rtnl_link_ops ip6_link_ops __read_mostly;
81 static unsigned int ip6_tnl_net_id __read_mostly;
83 /* the IPv6 tunnel fallback device */
84 struct net_device *fb_tnl_dev;
85 /* lists for storing tunnels in use */
86 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
87 struct ip6_tnl __rcu *tnls_wc[1];
88 struct ip6_tnl __rcu **tnls[2];
89 struct ip6_tnl __rcu *collect_md_tun;
92 static inline int ip6_tnl_mpls_supported(void)
94 return IS_ENABLED(CONFIG_MPLS);
97 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
99 struct pcpu_sw_netstats tmp, sum = { 0 };
102 for_each_possible_cpu(i) {
104 const struct pcpu_sw_netstats *tstats =
105 per_cpu_ptr(dev->tstats, i);
108 start = u64_stats_fetch_begin_irq(&tstats->syncp);
109 tmp.rx_packets = tstats->rx_packets;
110 tmp.rx_bytes = tstats->rx_bytes;
111 tmp.tx_packets = tstats->tx_packets;
112 tmp.tx_bytes = tstats->tx_bytes;
113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
115 sum.rx_packets += tmp.rx_packets;
116 sum.rx_bytes += tmp.rx_bytes;
117 sum.tx_packets += tmp.tx_packets;
118 sum.tx_bytes += tmp.tx_bytes;
120 dev->stats.rx_packets = sum.rx_packets;
121 dev->stats.rx_bytes = sum.rx_bytes;
122 dev->stats.tx_packets = sum.tx_packets;
123 dev->stats.tx_bytes = sum.tx_bytes;
127 #define for_each_ip6_tunnel_rcu(start) \
128 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
131 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
132 * @net: network namespace
133 * @link: ifindex of underlying interface
134 * @remote: the address of the tunnel exit-point
135 * @local: the address of the tunnel entry-point
138 * tunnel matching given end-points if found,
139 * else fallback tunnel if its device is up,
143 static struct ip6_tnl *
144 ip6_tnl_lookup(struct net *net, int link,
145 const struct in6_addr *remote, const struct in6_addr *local)
147 unsigned int hash = HASH(remote, local);
148 struct ip6_tnl *t, *cand = NULL;
149 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
152 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
153 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
154 !ipv6_addr_equal(remote, &t->parms.raddr) ||
155 !(t->dev->flags & IFF_UP))
158 if (link == t->parms.link)
164 memset(&any, 0, sizeof(any));
165 hash = HASH(&any, local);
166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
167 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
168 !ipv6_addr_any(&t->parms.raddr) ||
169 !(t->dev->flags & IFF_UP))
172 if (link == t->parms.link)
178 hash = HASH(remote, &any);
179 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
180 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
181 !ipv6_addr_any(&t->parms.laddr) ||
182 !(t->dev->flags & IFF_UP))
185 if (link == t->parms.link)
194 t = rcu_dereference(ip6n->collect_md_tun);
195 if (t && t->dev->flags & IFF_UP)
198 t = rcu_dereference(ip6n->tnls_wc[0]);
199 if (t && (t->dev->flags & IFF_UP))
206 * ip6_tnl_bucket - get head of list matching given tunnel parameters
207 * @p: parameters containing tunnel end-points
210 * ip6_tnl_bucket() returns the head of the list matching the
211 * &struct in6_addr entries laddr and raddr in @p.
213 * Return: head of IPv6 tunnel list
216 static struct ip6_tnl __rcu **
217 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
219 const struct in6_addr *remote = &p->raddr;
220 const struct in6_addr *local = &p->laddr;
224 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
226 h = HASH(remote, local);
228 return &ip6n->tnls[prio][h];
232 * ip6_tnl_link - add tunnel to hash table
233 * @t: tunnel to be added
237 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
239 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
241 if (t->parms.collect_md)
242 rcu_assign_pointer(ip6n->collect_md_tun, t);
243 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
244 rcu_assign_pointer(*tp, t);
248 * ip6_tnl_unlink - remove tunnel from hash table
249 * @t: tunnel to be removed
253 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
255 struct ip6_tnl __rcu **tp;
256 struct ip6_tnl *iter;
258 if (t->parms.collect_md)
259 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
261 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
262 (iter = rtnl_dereference(*tp)) != NULL;
265 rcu_assign_pointer(*tp, t->next);
271 static void ip6_dev_free(struct net_device *dev)
273 struct ip6_tnl *t = netdev_priv(dev);
275 gro_cells_destroy(&t->gro_cells);
276 dst_cache_destroy(&t->dst_cache);
277 free_percpu(dev->tstats);
280 static int ip6_tnl_create2(struct net_device *dev)
282 struct ip6_tnl *t = netdev_priv(dev);
283 struct net *net = dev_net(dev);
284 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
287 t = netdev_priv(dev);
289 dev->rtnl_link_ops = &ip6_link_ops;
290 err = register_netdevice(dev);
294 strcpy(t->parms.name, dev->name);
297 ip6_tnl_link(ip6n, t);
305 * ip6_tnl_create - create a new tunnel
306 * @net: network namespace
307 * @p: tunnel parameters
310 * Create tunnel matching given parameters.
313 * created tunnel or error pointer
316 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
318 struct net_device *dev;
324 if (!dev_valid_name(p->name))
326 strlcpy(name, p->name, IFNAMSIZ);
328 sprintf(name, "ip6tnl%%d");
331 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
336 dev_net_set(dev, net);
338 t = netdev_priv(dev);
340 t->net = dev_net(dev);
341 err = ip6_tnl_create2(dev);
354 * ip6_tnl_locate - find or create tunnel matching given parameters
355 * @net: network namespace
356 * @p: tunnel parameters
357 * @create: != 0 if allowed to create new tunnel if no match found
360 * ip6_tnl_locate() first tries to locate an existing tunnel
361 * based on @parms. If this is unsuccessful, but @create is set a new
362 * tunnel device is created and registered for use.
365 * matching tunnel or error pointer
368 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
369 struct __ip6_tnl_parm *p, int create)
371 const struct in6_addr *remote = &p->raddr;
372 const struct in6_addr *local = &p->laddr;
373 struct ip6_tnl __rcu **tp;
375 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
377 for (tp = ip6_tnl_bucket(ip6n, p);
378 (t = rtnl_dereference(*tp)) != NULL;
380 if (ipv6_addr_equal(local, &t->parms.laddr) &&
381 ipv6_addr_equal(remote, &t->parms.raddr) &&
382 p->link == t->parms.link) {
384 return ERR_PTR(-EEXIST);
390 return ERR_PTR(-ENODEV);
391 return ip6_tnl_create(net, p);
395 * ip6_tnl_dev_uninit - tunnel device uninitializer
396 * @dev: the device to be destroyed
399 * ip6_tnl_dev_uninit() removes tunnel from its list
403 ip6_tnl_dev_uninit(struct net_device *dev)
405 struct ip6_tnl *t = netdev_priv(dev);
406 struct net *net = t->net;
407 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
409 if (dev == ip6n->fb_tnl_dev)
410 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
412 ip6_tnl_unlink(ip6n, t);
413 dst_cache_reset(&t->dst_cache);
418 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
419 * @skb: received socket buffer
422 * 0 if none was found,
423 * else index to encapsulation limit
426 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
428 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
429 unsigned int nhoff = raw - skb->data;
430 unsigned int off = nhoff + sizeof(*ipv6h);
431 u8 next, nexthdr = ipv6h->nexthdr;
433 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
434 struct ipv6_opt_hdr *hdr;
437 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
440 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
441 if (nexthdr == NEXTHDR_FRAGMENT) {
442 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
443 if (frag_hdr->frag_off)
446 } else if (nexthdr == NEXTHDR_AUTH) {
447 optlen = ipv6_authlen(hdr);
449 optlen = ipv6_optlen(hdr);
451 /* cache hdr->nexthdr, since pskb_may_pull() might
455 if (nexthdr == NEXTHDR_DEST) {
458 /* Remember : hdr is no longer valid at this point. */
459 if (!pskb_may_pull(skb, off + optlen))
463 struct ipv6_tlv_tnl_enc_lim *tel;
465 /* No more room for encapsulation limit */
466 if (i + sizeof(*tel) > optlen)
469 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
470 /* return index of option if found and valid */
471 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
473 return i + off - nhoff;
474 /* else jump to next option */
476 i += tel->length + 2;
486 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
489 * ip6_tnl_err - tunnel error handler
492 * ip6_tnl_err() should handle errors in the tunnel according
493 * to the specifications in RFC 2473.
497 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
498 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
500 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
501 struct net *net = dev_net(skb->dev);
502 u8 rel_type = ICMPV6_DEST_UNREACH;
503 u8 rel_code = ICMPV6_ADDR_UNREACH;
511 /* If the packet doesn't contain the original IPv6 header we are
512 in trouble since we might need the source address for further
513 processing of the error. */
516 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
520 tproto = READ_ONCE(t->parms.proto);
521 if (tproto != ipproto && tproto != 0)
527 case ICMPV6_DEST_UNREACH:
528 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
532 case ICMPV6_TIME_EXCEED:
533 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
534 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
539 case ICMPV6_PARAMPROB: {
540 struct ipv6_tlv_tnl_enc_lim *tel;
544 if ((*code) == ICMPV6_HDR_FIELD)
545 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
547 if (teli && teli == *info - 2) {
548 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
549 if (tel->encap_limit == 0) {
550 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
555 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
560 case ICMPV6_PKT_TOOBIG: {
563 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
564 sock_net_uid(net, NULL));
565 mtu = *info - offset;
566 if (mtu < IPV6_MIN_MTU)
568 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
570 rel_type = ICMPV6_PKT_TOOBIG;
578 ip6_redirect(skb, net, skb->dev->ifindex, 0,
579 sock_net_uid(net, NULL));
594 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
595 u8 type, u8 code, int offset, __be32 info)
597 __u32 rel_info = ntohl(info);
598 const struct iphdr *eiph;
599 struct sk_buff *skb2;
600 int err, rel_msg = 0;
606 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
607 &rel_msg, &rel_info, offset);
615 case ICMPV6_DEST_UNREACH:
616 if (rel_code != ICMPV6_ADDR_UNREACH)
618 rel_type = ICMP_DEST_UNREACH;
619 rel_code = ICMP_HOST_UNREACH;
621 case ICMPV6_PKT_TOOBIG:
624 rel_type = ICMP_DEST_UNREACH;
625 rel_code = ICMP_FRAG_NEEDED;
631 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
634 skb2 = skb_clone(skb, GFP_ATOMIC);
640 skb_pull(skb2, offset);
641 skb_reset_network_header(skb2);
644 /* Try to guess incoming interface */
645 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
646 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
650 skb2->dev = rt->dst.dev;
653 /* route "incoming" packet */
654 if (rt->rt_flags & RTCF_LOCAL) {
655 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
656 eiph->daddr, eiph->saddr, 0, 0,
657 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
658 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
663 skb_dst_set(skb2, &rt->dst);
665 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
667 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
671 /* change mtu on this route */
672 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
673 if (rel_info > dst_mtu(skb_dst(skb2)))
676 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
679 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
687 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
688 u8 type, u8 code, int offset, __be32 info)
690 __u32 rel_info = ntohl(info);
691 int err, rel_msg = 0;
695 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
696 &rel_msg, &rel_info, offset);
700 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
702 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
708 skb_pull(skb2, offset);
709 skb_reset_network_header(skb2);
711 /* Try to guess incoming interface */
712 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
715 if (rt && rt->dst.dev)
716 skb2->dev = rt->dst.dev;
718 icmpv6_send(skb2, rel_type, rel_code, rel_info);
729 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
730 u8 type, u8 code, int offset, __be32 info)
732 __u32 rel_info = ntohl(info);
733 int err, rel_msg = 0;
737 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
738 &rel_msg, &rel_info, offset);
742 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
743 const struct ipv6hdr *ipv6h,
746 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
748 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
749 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
751 return IP6_ECN_decapsulate(ipv6h, skb);
754 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
755 const struct ipv6hdr *ipv6h,
758 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
759 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
761 return IP6_ECN_decapsulate(ipv6h, skb);
764 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
765 const struct ipv6hdr *ipv6h,
768 /* ECN is not supported in AF_MPLS */
772 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
773 const struct in6_addr *laddr,
774 const struct in6_addr *raddr)
776 struct __ip6_tnl_parm *p = &t->parms;
777 int ltype = ipv6_addr_type(laddr);
778 int rtype = ipv6_addr_type(raddr);
781 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
782 flags = IP6_TNL_F_CAP_PER_PACKET;
783 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
784 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
785 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
786 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
787 if (ltype&IPV6_ADDR_UNICAST)
788 flags |= IP6_TNL_F_CAP_XMIT;
789 if (rtype&IPV6_ADDR_UNICAST)
790 flags |= IP6_TNL_F_CAP_RCV;
794 EXPORT_SYMBOL(ip6_tnl_get_cap);
796 /* called with rcu_read_lock() */
797 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
798 const struct in6_addr *laddr,
799 const struct in6_addr *raddr)
801 struct __ip6_tnl_parm *p = &t->parms;
803 struct net *net = t->net;
805 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
806 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
807 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
808 struct net_device *ldev = NULL;
811 ldev = dev_get_by_index_rcu(net, p->link);
813 if ((ipv6_addr_is_multicast(laddr) ||
814 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
815 0, IFA_F_TENTATIVE))) &&
816 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
817 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
818 0, IFA_F_TENTATIVE))))
823 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
825 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
826 const struct tnl_ptk_info *tpi,
827 struct metadata_dst *tun_dst,
828 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
829 const struct ipv6hdr *ipv6h,
830 struct sk_buff *skb),
833 struct pcpu_sw_netstats *tstats;
834 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
837 if ((!(tpi->flags & TUNNEL_CSUM) &&
838 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
839 ((tpi->flags & TUNNEL_CSUM) &&
840 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
841 tunnel->dev->stats.rx_crc_errors++;
842 tunnel->dev->stats.rx_errors++;
846 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
847 if (!(tpi->flags & TUNNEL_SEQ) ||
849 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
850 tunnel->dev->stats.rx_fifo_errors++;
851 tunnel->dev->stats.rx_errors++;
854 tunnel->i_seqno = ntohl(tpi->seq) + 1;
857 skb->protocol = tpi->proto;
859 /* Warning: All skb pointers will be invalidated! */
860 if (tunnel->dev->type == ARPHRD_ETHER) {
861 if (!pskb_may_pull(skb, ETH_HLEN)) {
862 tunnel->dev->stats.rx_length_errors++;
863 tunnel->dev->stats.rx_errors++;
867 ipv6h = ipv6_hdr(skb);
868 skb->protocol = eth_type_trans(skb, tunnel->dev);
869 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
871 skb->dev = tunnel->dev;
874 skb_reset_network_header(skb);
875 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
877 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
879 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
882 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
884 ipv6_get_dsfield(ipv6h));
886 ++tunnel->dev->stats.rx_frame_errors;
887 ++tunnel->dev->stats.rx_errors;
892 tstats = this_cpu_ptr(tunnel->dev->tstats);
893 u64_stats_update_begin(&tstats->syncp);
894 tstats->rx_packets++;
895 tstats->rx_bytes += skb->len;
896 u64_stats_update_end(&tstats->syncp);
898 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
901 skb_dst_set(skb, (struct dst_entry *)tun_dst);
903 gro_cells_receive(&tunnel->gro_cells, skb);
908 dst_release((struct dst_entry *)tun_dst);
913 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
914 const struct tnl_ptk_info *tpi,
915 struct metadata_dst *tun_dst,
918 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
921 EXPORT_SYMBOL(ip6_tnl_rcv);
923 static const struct tnl_ptk_info tpi_v6 = {
924 /* no tunnel info required for ipxip6. */
925 .proto = htons(ETH_P_IPV6),
928 static const struct tnl_ptk_info tpi_v4 = {
929 /* no tunnel info required for ipxip6. */
930 .proto = htons(ETH_P_IP),
933 static const struct tnl_ptk_info tpi_mpls = {
934 /* no tunnel info required for mplsip6. */
935 .proto = htons(ETH_P_MPLS_UC),
938 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
939 const struct tnl_ptk_info *tpi,
940 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
941 const struct ipv6hdr *ipv6h,
942 struct sk_buff *skb))
945 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
946 struct metadata_dst *tun_dst = NULL;
950 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
953 u8 tproto = READ_ONCE(t->parms.proto);
955 if (tproto != ipproto && tproto != 0)
957 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
959 ipv6h = ipv6_hdr(skb);
960 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
962 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
964 if (t->parms.collect_md) {
965 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
969 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
983 static int ip4ip6_rcv(struct sk_buff *skb)
985 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
986 ip4ip6_dscp_ecn_decapsulate);
989 static int ip6ip6_rcv(struct sk_buff *skb)
991 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
992 ip6ip6_dscp_ecn_decapsulate);
995 static int mplsip6_rcv(struct sk_buff *skb)
997 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
998 mplsip6_dscp_ecn_decapsulate);
1001 struct ipv6_tel_txoption {
1002 struct ipv6_txoptions ops;
1006 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
1008 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
1010 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
1011 opt->dst_opt[3] = 1;
1012 opt->dst_opt[4] = encap_limit;
1013 opt->dst_opt[5] = IPV6_TLV_PADN;
1014 opt->dst_opt[6] = 1;
1016 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
1017 opt->ops.opt_nflen = 8;
1021 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
1022 * @t: the outgoing tunnel device
1023 * @hdr: IPv6 header from the incoming packet
1026 * Avoid trivial tunneling loop by checking that tunnel exit-point
1027 * doesn't match source of incoming packet.
1035 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1037 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1040 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1041 const struct in6_addr *laddr,
1042 const struct in6_addr *raddr)
1044 struct __ip6_tnl_parm *p = &t->parms;
1046 struct net *net = t->net;
1048 if (t->parms.collect_md)
1051 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1052 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1053 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1054 struct net_device *ldev = NULL;
1058 ldev = dev_get_by_index_rcu(net, p->link);
1060 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1061 0, IFA_F_TENTATIVE)))
1062 pr_warn("%s xmit: Local address not yet configured!\n",
1064 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1065 !ipv6_addr_is_multicast(raddr) &&
1066 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1067 true, 0, IFA_F_TENTATIVE)))
1068 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1076 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1079 * ip6_tnl_xmit - encapsulate packet and send
1080 * @skb: the outgoing socket buffer
1081 * @dev: the outgoing tunnel device
1082 * @dsfield: dscp code for outer header
1083 * @fl6: flow of tunneled packet
1084 * @encap_limit: encapsulation limit
1085 * @pmtu: Path MTU is stored if packet is too big
1086 * @proto: next header value
1089 * Build new header and do some sanity checks on the packet before sending
1095 * %-EMSGSIZE message too big. return mtu in this case.
1098 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1099 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1102 struct ip6_tnl *t = netdev_priv(dev);
1103 struct net *net = t->net;
1104 struct net_device_stats *stats = &t->dev->stats;
1105 struct ipv6hdr *ipv6h;
1106 struct ipv6_tel_txoption opt;
1107 struct dst_entry *dst = NULL, *ndst = NULL;
1108 struct net_device *tdev;
1110 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1111 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1112 unsigned int max_headroom = psh_hlen;
1113 bool use_cache = false;
1117 if (t->parms.collect_md) {
1118 hop_limit = skb_tunnel_info(skb)->key.ttl;
1121 hop_limit = t->parms.hop_limit;
1125 if (ipv6_addr_any(&t->parms.raddr)) {
1126 if (skb->protocol == htons(ETH_P_IPV6)) {
1127 struct in6_addr *addr6;
1128 struct neighbour *neigh;
1132 goto tx_err_link_failure;
1134 neigh = dst_neigh_lookup(skb_dst(skb),
1135 &ipv6_hdr(skb)->daddr);
1137 goto tx_err_link_failure;
1139 addr6 = (struct in6_addr *)&neigh->primary_key;
1140 addr_type = ipv6_addr_type(addr6);
1142 if (addr_type == IPV6_ADDR_ANY)
1143 addr6 = &ipv6_hdr(skb)->daddr;
1145 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1146 neigh_release(neigh);
1148 } else if (t->parms.proto != 0 && !(t->parms.flags &
1149 (IP6_TNL_F_USE_ORIG_TCLASS |
1150 IP6_TNL_F_USE_ORIG_FWMARK))) {
1151 /* enable the cache only if neither the outer protocol nor the
1152 * routing decision depends on the current inner header value
1158 dst = dst_cache_get(&t->dst_cache);
1160 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1161 goto tx_err_link_failure;
1165 /* add dsfield to flowlabel for route lookup */
1166 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1168 dst = ip6_route_output(net, NULL, fl6);
1171 goto tx_err_link_failure;
1172 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1176 goto tx_err_link_failure;
1178 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1179 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1180 &fl6->daddr, 0, &fl6->saddr))
1181 goto tx_err_link_failure;
1188 stats->collisions++;
1189 net_warn_ratelimited("%s: Local routing loop detected!\n",
1191 goto tx_err_dst_release;
1193 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1194 if (encap_limit >= 0) {
1198 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1199 IPV6_MIN_MTU : IPV4_MIN_MTU);
1201 skb_dst_update_pmtu_no_confirm(skb, mtu);
1202 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1205 goto tx_err_dst_release;
1208 if (t->err_count > 0) {
1209 if (time_before(jiffies,
1210 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1213 dst_link_failure(skb);
1219 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1222 * Okay, now see if we can stuff it in the buffer as-is.
1224 max_headroom += LL_RESERVED_SPACE(tdev);
1226 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1227 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1228 struct sk_buff *new_skb;
1230 new_skb = skb_realloc_headroom(skb, max_headroom);
1232 goto tx_err_dst_release;
1235 skb_set_owner_w(new_skb, skb->sk);
1240 if (t->parms.collect_md) {
1241 if (t->encap.type != TUNNEL_ENCAP_NONE)
1242 goto tx_err_dst_release;
1244 if (use_cache && ndst)
1245 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1247 skb_dst_set(skb, dst);
1249 if (hop_limit == 0) {
1250 if (skb->protocol == htons(ETH_P_IP))
1251 hop_limit = ip_hdr(skb)->ttl;
1252 else if (skb->protocol == htons(ETH_P_IPV6))
1253 hop_limit = ipv6_hdr(skb)->hop_limit;
1255 hop_limit = ip6_dst_hoplimit(dst);
1258 /* Calculate max headroom for all the headers and adjust
1259 * needed_headroom if necessary.
1261 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1262 + dst->header_len + t->hlen;
1263 if (max_headroom > dev->needed_headroom)
1264 dev->needed_headroom = max_headroom;
1266 err = ip6_tnl_encap(skb, t, &proto, fl6);
1270 if (encap_limit >= 0) {
1271 init_tel_txopt(&opt, encap_limit);
1272 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1275 skb_set_inner_ipproto(skb, proto);
1277 skb_push(skb, sizeof(struct ipv6hdr));
1278 skb_reset_network_header(skb);
1279 ipv6h = ipv6_hdr(skb);
1280 ip6_flow_hdr(ipv6h, dsfield,
1281 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1282 ipv6h->hop_limit = hop_limit;
1283 ipv6h->nexthdr = proto;
1284 ipv6h->saddr = fl6->saddr;
1285 ipv6h->daddr = fl6->daddr;
1286 ip6tunnel_xmit(NULL, skb, dev);
1288 tx_err_link_failure:
1289 stats->tx_carrier_errors++;
1290 dst_link_failure(skb);
1295 EXPORT_SYMBOL(ip6_tnl_xmit);
1298 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1301 struct ip6_tnl *t = netdev_priv(dev);
1302 struct ipv6hdr *ipv6h;
1303 const struct iphdr *iph;
1304 int encap_limit = -1;
1307 __u8 dsfield, orig_dsfield;
1312 tproto = READ_ONCE(t->parms.proto);
1313 if (tproto != protocol && tproto != 0)
1316 if (t->parms.collect_md) {
1317 struct ip_tunnel_info *tun_info;
1318 const struct ip_tunnel_key *key;
1320 tun_info = skb_tunnel_info(skb);
1321 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1322 ip_tunnel_info_af(tun_info) != AF_INET6))
1324 key = &tun_info->key;
1325 memset(&fl6, 0, sizeof(fl6));
1326 fl6.flowi6_proto = protocol;
1327 fl6.saddr = key->u.ipv6.src;
1328 fl6.daddr = key->u.ipv6.dst;
1329 fl6.flowlabel = key->label;
1334 orig_dsfield = ipv4_get_dsfield(iph);
1337 ipv6h = ipv6_hdr(skb);
1338 orig_dsfield = ipv6_get_dsfield(ipv6h);
1341 orig_dsfield = dsfield;
1345 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1346 encap_limit = t->parms.encap_limit;
1347 if (protocol == IPPROTO_IPV6) {
1348 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1349 skb_network_header(skb));
1350 /* ip6_tnl_parse_tlv_enc_lim() might have
1351 * reallocated skb->head
1354 struct ipv6_tlv_tnl_enc_lim *tel;
1356 tel = (void *)&skb_network_header(skb)[offset];
1357 if (tel->encap_limit == 0) {
1358 icmpv6_send(skb, ICMPV6_PARAMPROB,
1359 ICMPV6_HDR_FIELD, offset + 2);
1362 encap_limit = tel->encap_limit - 1;
1366 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1367 fl6.flowi6_proto = protocol;
1369 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1370 fl6.flowi6_mark = skb->mark;
1372 fl6.flowi6_mark = t->parms.fwmark;
1376 orig_dsfield = ipv4_get_dsfield(iph);
1377 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1378 dsfield = orig_dsfield;
1380 dsfield = ip6_tclass(t->parms.flowinfo);
1383 ipv6h = ipv6_hdr(skb);
1384 orig_dsfield = ipv6_get_dsfield(ipv6h);
1385 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1386 dsfield = orig_dsfield;
1388 dsfield = ip6_tclass(t->parms.flowinfo);
1389 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1390 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1393 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1398 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1399 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1401 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1404 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1407 /* XXX: send ICMP error even if DF is not set. */
1408 if (err == -EMSGSIZE)
1411 icmp_send(skb, ICMP_DEST_UNREACH,
1412 ICMP_FRAG_NEEDED, htonl(mtu));
1415 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1427 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1429 struct ip6_tnl *t = netdev_priv(dev);
1430 struct net_device_stats *stats = &t->dev->stats;
1434 if (!pskb_inet_may_pull(skb))
1437 switch (skb->protocol) {
1438 case htons(ETH_P_IP):
1439 ipproto = IPPROTO_IPIP;
1441 case htons(ETH_P_IPV6):
1442 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1444 ipproto = IPPROTO_IPV6;
1446 case htons(ETH_P_MPLS_UC):
1447 ipproto = IPPROTO_MPLS;
1453 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1457 return NETDEV_TX_OK;
1461 stats->tx_dropped++;
1463 return NETDEV_TX_OK;
1466 static void ip6_tnl_link_config(struct ip6_tnl *t)
1468 struct net_device *dev = t->dev;
1469 struct net_device *tdev = NULL;
1470 struct __ip6_tnl_parm *p = &t->parms;
1471 struct flowi6 *fl6 = &t->fl.u.ip6;
1475 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1476 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1478 /* Set up flowi template */
1479 fl6->saddr = p->laddr;
1480 fl6->daddr = p->raddr;
1481 fl6->flowi6_oif = p->link;
1484 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1485 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1486 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1487 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1489 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1490 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1492 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1493 dev->flags |= IFF_POINTOPOINT;
1495 dev->flags &= ~IFF_POINTOPOINT;
1498 t->hlen = t->encap_hlen + t->tun_hlen;
1499 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1501 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1502 int strict = (ipv6_addr_type(&p->raddr) &
1503 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1505 struct rt6_info *rt = rt6_lookup(t->net,
1506 &p->raddr, &p->laddr,
1507 p->link, NULL, strict);
1513 if (!tdev && p->link)
1514 tdev = __dev_get_by_index(t->net, p->link);
1517 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1518 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1520 dev->mtu = mtu - t_hlen;
1521 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1524 if (dev->mtu < IPV6_MIN_MTU)
1525 dev->mtu = IPV6_MIN_MTU;
1531 * ip6_tnl_change - update the tunnel parameters
1532 * @t: tunnel to be changed
1533 * @p: tunnel configuration parameters
1536 * ip6_tnl_change() updates the tunnel parameters
1540 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1542 t->parms.laddr = p->laddr;
1543 t->parms.raddr = p->raddr;
1544 t->parms.flags = p->flags;
1545 t->parms.hop_limit = p->hop_limit;
1546 t->parms.encap_limit = p->encap_limit;
1547 t->parms.flowinfo = p->flowinfo;
1548 t->parms.link = p->link;
1549 t->parms.proto = p->proto;
1550 t->parms.fwmark = p->fwmark;
1551 dst_cache_reset(&t->dst_cache);
1552 ip6_tnl_link_config(t);
1556 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1558 struct net *net = t->net;
1559 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1562 ip6_tnl_unlink(ip6n, t);
1564 err = ip6_tnl_change(t, p);
1565 ip6_tnl_link(ip6n, t);
1566 netdev_state_change(t->dev);
1570 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1572 /* for default tnl0 device allow to change only the proto */
1573 t->parms.proto = p->proto;
1574 netdev_state_change(t->dev);
1579 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1581 p->laddr = u->laddr;
1582 p->raddr = u->raddr;
1583 p->flags = u->flags;
1584 p->hop_limit = u->hop_limit;
1585 p->encap_limit = u->encap_limit;
1586 p->flowinfo = u->flowinfo;
1588 p->proto = u->proto;
1589 memcpy(p->name, u->name, sizeof(u->name));
1593 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1595 u->laddr = p->laddr;
1596 u->raddr = p->raddr;
1597 u->flags = p->flags;
1598 u->hop_limit = p->hop_limit;
1599 u->encap_limit = p->encap_limit;
1600 u->flowinfo = p->flowinfo;
1602 u->proto = p->proto;
1603 memcpy(u->name, p->name, sizeof(u->name));
1607 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1608 * @dev: virtual device associated with tunnel
1609 * @ifr: parameters passed from userspace
1610 * @cmd: command to be performed
1613 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1616 * The possible commands are the following:
1617 * %SIOCGETTUNNEL: get tunnel parameters for device
1618 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1619 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1620 * %SIOCDELTUNNEL: delete tunnel
1622 * The fallback device "ip6tnl0", created during module
1623 * initialization, can be used for creating other tunnel devices.
1627 * %-EFAULT if unable to copy data to or from userspace,
1628 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1629 * %-EINVAL if passed tunnel parameters are invalid,
1630 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1631 * %-ENODEV if attempting to change or delete a nonexisting device
1635 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1638 struct ip6_tnl_parm p;
1639 struct __ip6_tnl_parm p1;
1640 struct ip6_tnl *t = netdev_priv(dev);
1641 struct net *net = t->net;
1642 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1644 memset(&p1, 0, sizeof(p1));
1648 if (dev == ip6n->fb_tnl_dev) {
1649 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1653 ip6_tnl_parm_from_user(&p1, &p);
1654 t = ip6_tnl_locate(net, &p1, 0);
1656 t = netdev_priv(dev);
1658 memset(&p, 0, sizeof(p));
1660 ip6_tnl_parm_to_user(&p, &t->parms);
1661 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1668 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1671 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1674 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1677 ip6_tnl_parm_from_user(&p1, &p);
1678 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1679 if (cmd == SIOCCHGTUNNEL) {
1681 if (t->dev != dev) {
1686 t = netdev_priv(dev);
1687 if (dev == ip6n->fb_tnl_dev)
1688 err = ip6_tnl0_update(t, &p1);
1690 err = ip6_tnl_update(t, &p1);
1694 ip6_tnl_parm_to_user(&p, &t->parms);
1695 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1704 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1707 if (dev == ip6n->fb_tnl_dev) {
1709 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1712 ip6_tnl_parm_from_user(&p1, &p);
1713 t = ip6_tnl_locate(net, &p1, 0);
1717 if (t->dev == ip6n->fb_tnl_dev)
1722 unregister_netdevice(dev);
1731 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1732 * @dev: virtual device associated with tunnel
1733 * @new_mtu: the new mtu
1737 * %-EINVAL if mtu too small
1740 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1742 struct ip6_tnl *tnl = netdev_priv(dev);
1744 if (tnl->parms.proto == IPPROTO_IPV6) {
1745 if (new_mtu < IPV6_MIN_MTU)
1748 if (new_mtu < ETH_MIN_MTU)
1751 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1752 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1755 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1761 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1763 int ip6_tnl_get_iflink(const struct net_device *dev)
1765 struct ip6_tnl *t = netdev_priv(dev);
1767 return t->parms.link;
1769 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1771 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1774 if (num >= MAX_IPTUN_ENCAP_OPS)
1777 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1778 &ip6tun_encaps[num],
1779 NULL, ops) ? 0 : -1;
1781 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1783 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1788 if (num >= MAX_IPTUN_ENCAP_OPS)
1791 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1792 &ip6tun_encaps[num],
1793 ops, NULL) == ops) ? 0 : -1;
1799 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1801 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1802 struct ip_tunnel_encap *ipencap)
1806 memset(&t->encap, 0, sizeof(t->encap));
1808 hlen = ip6_encap_hlen(ipencap);
1812 t->encap.type = ipencap->type;
1813 t->encap.sport = ipencap->sport;
1814 t->encap.dport = ipencap->dport;
1815 t->encap.flags = ipencap->flags;
1817 t->encap_hlen = hlen;
1818 t->hlen = t->encap_hlen + t->tun_hlen;
1822 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1824 static const struct net_device_ops ip6_tnl_netdev_ops = {
1825 .ndo_init = ip6_tnl_dev_init,
1826 .ndo_uninit = ip6_tnl_dev_uninit,
1827 .ndo_start_xmit = ip6_tnl_start_xmit,
1828 .ndo_do_ioctl = ip6_tnl_ioctl,
1829 .ndo_change_mtu = ip6_tnl_change_mtu,
1830 .ndo_get_stats = ip6_get_stats,
1831 .ndo_get_iflink = ip6_tnl_get_iflink,
1834 #define IPXIPX_FEATURES (NETIF_F_SG | \
1835 NETIF_F_FRAGLIST | \
1837 NETIF_F_GSO_SOFTWARE | \
1841 * ip6_tnl_dev_setup - setup virtual tunnel device
1842 * @dev: virtual device associated with tunnel
1845 * Initialize function pointers and device parameters
1848 static void ip6_tnl_dev_setup(struct net_device *dev)
1850 dev->netdev_ops = &ip6_tnl_netdev_ops;
1851 dev->header_ops = &ip_tunnel_header_ops;
1852 dev->needs_free_netdev = true;
1853 dev->priv_destructor = ip6_dev_free;
1855 dev->type = ARPHRD_TUNNEL6;
1856 dev->flags |= IFF_NOARP;
1857 dev->addr_len = sizeof(struct in6_addr);
1858 dev->features |= NETIF_F_LLTX;
1859 netif_keep_dst(dev);
1861 dev->features |= IPXIPX_FEATURES;
1862 dev->hw_features |= IPXIPX_FEATURES;
1864 /* This perm addr will be used as interface identifier by IPv6 */
1865 dev->addr_assign_type = NET_ADDR_RANDOM;
1866 eth_random_addr(dev->perm_addr);
1871 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1872 * @dev: virtual device associated with tunnel
1876 ip6_tnl_dev_init_gen(struct net_device *dev)
1878 struct ip6_tnl *t = netdev_priv(dev);
1883 t->net = dev_net(dev);
1884 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1888 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1892 ret = gro_cells_init(&t->gro_cells, dev);
1897 t->hlen = t->encap_hlen + t->tun_hlen;
1898 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1900 dev->type = ARPHRD_TUNNEL6;
1901 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1902 dev->mtu = ETH_DATA_LEN - t_hlen;
1903 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1905 dev->min_mtu = ETH_MIN_MTU;
1906 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1911 dst_cache_destroy(&t->dst_cache);
1913 free_percpu(dev->tstats);
1920 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1921 * @dev: virtual device associated with tunnel
1924 static int ip6_tnl_dev_init(struct net_device *dev)
1926 struct ip6_tnl *t = netdev_priv(dev);
1927 int err = ip6_tnl_dev_init_gen(dev);
1931 ip6_tnl_link_config(t);
1932 if (t->parms.collect_md)
1933 netif_keep_dst(dev);
1938 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1939 * @dev: fallback device
1944 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1946 struct ip6_tnl *t = netdev_priv(dev);
1947 struct net *net = dev_net(dev);
1948 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1950 t->parms.proto = IPPROTO_IPV6;
1953 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1957 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1958 struct netlink_ext_ack *extack)
1962 if (!data || !data[IFLA_IPTUN_PROTO])
1965 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1966 if (proto != IPPROTO_IPV6 &&
1967 proto != IPPROTO_IPIP &&
1974 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1975 struct __ip6_tnl_parm *parms)
1977 memset(parms, 0, sizeof(*parms));
1982 if (data[IFLA_IPTUN_LINK])
1983 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1985 if (data[IFLA_IPTUN_LOCAL])
1986 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1988 if (data[IFLA_IPTUN_REMOTE])
1989 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1991 if (data[IFLA_IPTUN_TTL])
1992 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1994 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1995 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1997 if (data[IFLA_IPTUN_FLOWINFO])
1998 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
2000 if (data[IFLA_IPTUN_FLAGS])
2001 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
2003 if (data[IFLA_IPTUN_PROTO])
2004 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2006 if (data[IFLA_IPTUN_COLLECT_METADATA])
2007 parms->collect_md = true;
2009 if (data[IFLA_IPTUN_FWMARK])
2010 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
2013 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
2014 struct ip_tunnel_encap *ipencap)
2018 memset(ipencap, 0, sizeof(*ipencap));
2023 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2025 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2028 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2030 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2033 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2035 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2038 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2040 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2046 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2047 struct nlattr *tb[], struct nlattr *data[],
2048 struct netlink_ext_ack *extack)
2050 struct net *net = dev_net(dev);
2051 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2052 struct ip_tunnel_encap ipencap;
2053 struct ip6_tnl *nt, *t;
2056 nt = netdev_priv(dev);
2058 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2059 err = ip6_tnl_encap_setup(nt, &ipencap);
2064 ip6_tnl_netlink_parms(data, &nt->parms);
2066 if (nt->parms.collect_md) {
2067 if (rtnl_dereference(ip6n->collect_md_tun))
2070 t = ip6_tnl_locate(net, &nt->parms, 0);
2075 err = ip6_tnl_create2(dev);
2076 if (!err && tb[IFLA_MTU])
2077 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2082 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2083 struct nlattr *data[],
2084 struct netlink_ext_ack *extack)
2086 struct ip6_tnl *t = netdev_priv(dev);
2087 struct __ip6_tnl_parm p;
2088 struct net *net = t->net;
2089 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2090 struct ip_tunnel_encap ipencap;
2092 if (dev == ip6n->fb_tnl_dev)
2095 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2096 int err = ip6_tnl_encap_setup(t, &ipencap);
2101 ip6_tnl_netlink_parms(data, &p);
2105 t = ip6_tnl_locate(net, &p, 0);
2110 t = netdev_priv(dev);
2112 return ip6_tnl_update(t, &p);
2115 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2117 struct net *net = dev_net(dev);
2118 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2120 if (dev != ip6n->fb_tnl_dev)
2121 unregister_netdevice_queue(dev, head);
2124 static size_t ip6_tnl_get_size(const struct net_device *dev)
2127 /* IFLA_IPTUN_LINK */
2129 /* IFLA_IPTUN_LOCAL */
2130 nla_total_size(sizeof(struct in6_addr)) +
2131 /* IFLA_IPTUN_REMOTE */
2132 nla_total_size(sizeof(struct in6_addr)) +
2133 /* IFLA_IPTUN_TTL */
2135 /* IFLA_IPTUN_ENCAP_LIMIT */
2137 /* IFLA_IPTUN_FLOWINFO */
2139 /* IFLA_IPTUN_FLAGS */
2141 /* IFLA_IPTUN_PROTO */
2143 /* IFLA_IPTUN_ENCAP_TYPE */
2145 /* IFLA_IPTUN_ENCAP_FLAGS */
2147 /* IFLA_IPTUN_ENCAP_SPORT */
2149 /* IFLA_IPTUN_ENCAP_DPORT */
2151 /* IFLA_IPTUN_COLLECT_METADATA */
2153 /* IFLA_IPTUN_FWMARK */
2158 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2160 struct ip6_tnl *tunnel = netdev_priv(dev);
2161 struct __ip6_tnl_parm *parm = &tunnel->parms;
2163 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2164 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2165 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2166 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2167 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2168 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2169 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2170 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2171 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2172 goto nla_put_failure;
2174 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2175 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2176 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2177 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2178 goto nla_put_failure;
2180 if (parm->collect_md)
2181 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2182 goto nla_put_failure;
2190 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2192 struct ip6_tnl *tunnel = netdev_priv(dev);
2196 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2198 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2199 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2200 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2201 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2202 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2203 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2204 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2205 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2206 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2207 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2208 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2209 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2210 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2211 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2212 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2215 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2217 .maxtype = IFLA_IPTUN_MAX,
2218 .policy = ip6_tnl_policy,
2219 .priv_size = sizeof(struct ip6_tnl),
2220 .setup = ip6_tnl_dev_setup,
2221 .validate = ip6_tnl_validate,
2222 .newlink = ip6_tnl_newlink,
2223 .changelink = ip6_tnl_changelink,
2224 .dellink = ip6_tnl_dellink,
2225 .get_size = ip6_tnl_get_size,
2226 .fill_info = ip6_tnl_fill_info,
2227 .get_link_net = ip6_tnl_get_link_net,
2230 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2231 .handler = ip4ip6_rcv,
2232 .err_handler = ip4ip6_err,
2236 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2237 .handler = ip6ip6_rcv,
2238 .err_handler = ip6ip6_err,
2242 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2243 .handler = mplsip6_rcv,
2244 .err_handler = mplsip6_err,
2248 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2250 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2251 struct net_device *dev, *aux;
2255 for_each_netdev_safe(net, dev, aux)
2256 if (dev->rtnl_link_ops == &ip6_link_ops)
2257 unregister_netdevice_queue(dev, list);
2259 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2260 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2262 /* If dev is in the same netns, it has already
2263 * been added to the list by the previous loop.
2265 if (!net_eq(dev_net(t->dev), net))
2266 unregister_netdevice_queue(t->dev, list);
2267 t = rtnl_dereference(t->next);
2272 static int __net_init ip6_tnl_init_net(struct net *net)
2274 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2275 struct ip6_tnl *t = NULL;
2278 ip6n->tnls[0] = ip6n->tnls_wc;
2279 ip6n->tnls[1] = ip6n->tnls_r_l;
2281 if (!net_has_fallback_tunnels(net))
2284 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2285 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2287 if (!ip6n->fb_tnl_dev)
2289 dev_net_set(ip6n->fb_tnl_dev, net);
2290 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2291 /* FB netdevice is special: we have one, and only one per netns.
2292 * Allowing to move it to another netns is clearly unsafe.
2294 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2296 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2300 err = register_netdev(ip6n->fb_tnl_dev);
2304 t = netdev_priv(ip6n->fb_tnl_dev);
2306 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2310 free_netdev(ip6n->fb_tnl_dev);
2315 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2321 list_for_each_entry(net, net_list, exit_list)
2322 ip6_tnl_destroy_tunnels(net, &list);
2323 unregister_netdevice_many(&list);
2327 static struct pernet_operations ip6_tnl_net_ops = {
2328 .init = ip6_tnl_init_net,
2329 .exit_batch = ip6_tnl_exit_batch_net,
2330 .id = &ip6_tnl_net_id,
2331 .size = sizeof(struct ip6_tnl_net),
2335 * ip6_tunnel_init - register protocol and reserve needed resources
2337 * Return: 0 on success
2340 static int __init ip6_tunnel_init(void)
2344 if (!ipv6_mod_enabled())
2347 err = register_pernet_device(&ip6_tnl_net_ops);
2351 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2353 pr_err("%s: can't register ip4ip6\n", __func__);
2357 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2359 pr_err("%s: can't register ip6ip6\n", __func__);
2363 if (ip6_tnl_mpls_supported()) {
2364 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2366 pr_err("%s: can't register mplsip6\n", __func__);
2371 err = rtnl_link_register(&ip6_link_ops);
2373 goto rtnl_link_failed;
2378 if (ip6_tnl_mpls_supported())
2379 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2381 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2383 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2385 unregister_pernet_device(&ip6_tnl_net_ops);
2391 * ip6_tunnel_cleanup - free resources and unregister protocol
2394 static void __exit ip6_tunnel_cleanup(void)
2396 rtnl_link_unregister(&ip6_link_ops);
2397 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2398 pr_info("%s: can't deregister ip4ip6\n", __func__);
2400 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2401 pr_info("%s: can't deregister ip6ip6\n", __func__);
2403 if (ip6_tnl_mpls_supported() &&
2404 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2405 pr_info("%s: can't deregister mplsip6\n", __func__);
2406 unregister_pernet_device(&ip6_tnl_net_ops);
2409 module_init(ip6_tunnel_init);
2410 module_exit(ip6_tunnel_cleanup);