2 * IPv6 tunneling device
3 * Linux INET6 implementation
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/sockios.h>
28 #include <linux/icmp.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/route.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/netfilter_ipv6.h>
41 #include <linux/slab.h>
42 #include <linux/hash.h>
43 #include <linux/etherdevice.h>
45 #include <asm/uaccess.h>
46 #include <linux/atomic.h>
50 #include <net/ip_tunnels.h>
52 #include <net/ip6_route.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_tunnel.h>
56 #include <net/dsfield.h>
57 #include <net/inet_ecn.h>
58 #include <net/net_namespace.h>
59 #include <net/netns/generic.h>
61 MODULE_AUTHOR("Ville Nuorvala");
62 MODULE_DESCRIPTION("IPv6 tunneling device");
63 MODULE_LICENSE("GPL");
64 MODULE_ALIAS_RTNL_LINK("ip6tnl");
65 MODULE_ALIAS_NETDEV("ip6tnl0");
68 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
70 #define IP6_TNL_TRACE(x...) do {;} while(0)
73 #define HASH_SIZE_SHIFT 5
74 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
76 static bool log_ecn_error = true;
77 module_param(log_ecn_error, bool, 0644);
78 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
80 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
82 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
84 return hash_32(hash, HASH_SIZE_SHIFT);
87 static int ip6_tnl_dev_init(struct net_device *dev);
88 static void ip6_tnl_dev_setup(struct net_device *dev);
89 static struct rtnl_link_ops ip6_link_ops __read_mostly;
91 static int ip6_tnl_net_id __read_mostly;
93 /* the IPv6 tunnel fallback device */
94 struct net_device *fb_tnl_dev;
95 /* lists for storing tunnels in use */
96 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
97 struct ip6_tnl __rcu *tnls_wc[1];
98 struct ip6_tnl __rcu **tnls[2];
101 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
103 struct pcpu_sw_netstats tmp, sum = { 0 };
106 for_each_possible_cpu(i) {
108 const struct pcpu_sw_netstats *tstats =
109 per_cpu_ptr(dev->tstats, i);
112 start = u64_stats_fetch_begin_irq(&tstats->syncp);
113 tmp.rx_packets = tstats->rx_packets;
114 tmp.rx_bytes = tstats->rx_bytes;
115 tmp.tx_packets = tstats->tx_packets;
116 tmp.tx_bytes = tstats->tx_bytes;
117 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
119 sum.rx_packets += tmp.rx_packets;
120 sum.rx_bytes += tmp.rx_bytes;
121 sum.tx_packets += tmp.tx_packets;
122 sum.tx_bytes += tmp.tx_bytes;
124 dev->stats.rx_packets = sum.rx_packets;
125 dev->stats.rx_bytes = sum.rx_bytes;
126 dev->stats.tx_packets = sum.tx_packets;
127 dev->stats.tx_bytes = sum.tx_bytes;
132 * Locking : hash tables are protected by RCU and RTNL
135 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
137 struct dst_entry *dst = t->dst_cache;
139 if (dst && dst->obsolete &&
140 dst->ops->check(dst, t->dst_cookie) == NULL) {
148 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
150 void ip6_tnl_dst_reset(struct ip6_tnl *t)
152 dst_release(t->dst_cache);
155 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
157 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
159 struct rt6_info *rt = (struct rt6_info *) dst;
160 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
161 dst_release(t->dst_cache);
164 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
167 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
168 * @remote: the address of the tunnel exit-point
169 * @local: the address of the tunnel entry-point
172 * tunnel matching given end-points if found,
173 * else fallback tunnel if its device is up,
177 #define for_each_ip6_tunnel_rcu(start) \
178 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
180 static struct ip6_tnl *
181 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
183 unsigned int hash = HASH(remote, local);
185 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
187 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
188 if (ipv6_addr_equal(local, &t->parms.laddr) &&
189 ipv6_addr_equal(remote, &t->parms.raddr) &&
190 (t->dev->flags & IFF_UP))
193 t = rcu_dereference(ip6n->tnls_wc[0]);
194 if (t && (t->dev->flags & IFF_UP))
201 * ip6_tnl_bucket - get head of list matching given tunnel parameters
202 * @p: parameters containing tunnel end-points
205 * ip6_tnl_bucket() returns the head of the list matching the
206 * &struct in6_addr entries laddr and raddr in @p.
208 * Return: head of IPv6 tunnel list
211 static struct ip6_tnl __rcu **
212 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
214 const struct in6_addr *remote = &p->raddr;
215 const struct in6_addr *local = &p->laddr;
219 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
221 h = HASH(remote, local);
223 return &ip6n->tnls[prio][h];
227 * ip6_tnl_link - add tunnel to hash table
228 * @t: tunnel to be added
232 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
234 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
236 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
237 rcu_assign_pointer(*tp, t);
241 * ip6_tnl_unlink - remove tunnel from hash table
242 * @t: tunnel to be removed
246 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
248 struct ip6_tnl __rcu **tp;
249 struct ip6_tnl *iter;
251 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
252 (iter = rtnl_dereference(*tp)) != NULL;
255 rcu_assign_pointer(*tp, t->next);
261 static void ip6_dev_free(struct net_device *dev)
263 free_percpu(dev->tstats);
267 static int ip6_tnl_create2(struct net_device *dev)
269 struct ip6_tnl *t = netdev_priv(dev);
270 struct net *net = dev_net(dev);
271 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
274 t = netdev_priv(dev);
275 err = ip6_tnl_dev_init(dev);
279 err = register_netdevice(dev);
283 strcpy(t->parms.name, dev->name);
284 dev->rtnl_link_ops = &ip6_link_ops;
287 ip6_tnl_link(ip6n, t);
295 * ip6_tnl_create - create a new tunnel
296 * @p: tunnel parameters
297 * @pt: pointer to new tunnel
300 * Create tunnel matching given parameters.
303 * created tunnel or NULL
306 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
308 struct net_device *dev;
314 strlcpy(name, p->name, IFNAMSIZ);
316 sprintf(name, "ip6tnl%%d");
318 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
323 dev_net_set(dev, net);
325 t = netdev_priv(dev);
327 t->net = dev_net(dev);
328 err = ip6_tnl_create2(dev);
341 * ip6_tnl_locate - find or create tunnel matching given parameters
342 * @p: tunnel parameters
343 * @create: != 0 if allowed to create new tunnel if no match found
346 * ip6_tnl_locate() first tries to locate an existing tunnel
347 * based on @parms. If this is unsuccessful, but @create is set a new
348 * tunnel device is created and registered for use.
351 * matching tunnel or NULL
354 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
355 struct __ip6_tnl_parm *p, int create)
357 const struct in6_addr *remote = &p->raddr;
358 const struct in6_addr *local = &p->laddr;
359 struct ip6_tnl __rcu **tp;
361 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
363 for (tp = ip6_tnl_bucket(ip6n, p);
364 (t = rtnl_dereference(*tp)) != NULL;
366 if (ipv6_addr_equal(local, &t->parms.laddr) &&
367 ipv6_addr_equal(remote, &t->parms.raddr))
372 return ip6_tnl_create(net, p);
376 * ip6_tnl_dev_uninit - tunnel device uninitializer
377 * @dev: the device to be destroyed
380 * ip6_tnl_dev_uninit() removes tunnel from its list
384 ip6_tnl_dev_uninit(struct net_device *dev)
386 struct ip6_tnl *t = netdev_priv(dev);
387 struct net *net = t->net;
388 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
390 if (dev == ip6n->fb_tnl_dev)
391 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
393 ip6_tnl_unlink(ip6n, t);
394 ip6_tnl_dst_reset(t);
399 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
400 * @skb: received socket buffer
403 * 0 if none was found,
404 * else index to encapsulation limit
407 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
409 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
410 __u8 nexthdr = ipv6h->nexthdr;
411 __u16 off = sizeof (*ipv6h);
413 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
415 struct ipv6_opt_hdr *hdr;
416 if (raw + off + sizeof (*hdr) > skb->data &&
417 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
420 hdr = (struct ipv6_opt_hdr *) (raw + off);
421 if (nexthdr == NEXTHDR_FRAGMENT) {
422 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
423 if (frag_hdr->frag_off)
426 } else if (nexthdr == NEXTHDR_AUTH) {
427 optlen = (hdr->hdrlen + 2) << 2;
429 optlen = ipv6_optlen(hdr);
431 if (nexthdr == NEXTHDR_DEST) {
434 struct ipv6_tlv_tnl_enc_lim *tel;
436 /* No more room for encapsulation limit */
437 if (i + sizeof (*tel) > off + optlen)
440 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
441 /* return index of option if found and valid */
442 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
445 /* else jump to next option */
447 i += tel->length + 2;
452 nexthdr = hdr->nexthdr;
457 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
460 * ip6_tnl_err - tunnel error handler
463 * ip6_tnl_err() should handle errors in the tunnel according
464 * to the specifications in RFC 2473.
468 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
469 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
471 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
474 u8 rel_type = ICMPV6_DEST_UNREACH;
475 u8 rel_code = ICMPV6_ADDR_UNREACH;
480 /* If the packet doesn't contain the original IPv6 header we are
481 in trouble since we might need the source address for further
482 processing of the error. */
485 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
486 &ipv6h->saddr)) == NULL)
489 if (t->parms.proto != ipproto && t->parms.proto != 0)
496 struct ipv6_tlv_tnl_enc_lim *tel;
498 case ICMPV6_DEST_UNREACH:
499 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
503 case ICMPV6_TIME_EXCEED:
504 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
505 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
510 case ICMPV6_PARAMPROB:
512 if ((*code) == ICMPV6_HDR_FIELD)
513 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
515 if (teli && teli == *info - 2) {
516 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
517 if (tel->encap_limit == 0) {
518 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
523 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
527 case ICMPV6_PKT_TOOBIG:
528 mtu = *info - offset;
529 if (mtu < IPV6_MIN_MTU)
533 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
534 rel_type = ICMPV6_PKT_TOOBIG;
553 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
554 u8 type, u8 code, int offset, __be32 info)
559 __u32 rel_info = ntohl(info);
561 struct sk_buff *skb2;
562 const struct iphdr *eiph;
566 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
567 &rel_msg, &rel_info, offset);
575 case ICMPV6_DEST_UNREACH:
576 if (rel_code != ICMPV6_ADDR_UNREACH)
578 rel_type = ICMP_DEST_UNREACH;
579 rel_code = ICMP_HOST_UNREACH;
581 case ICMPV6_PKT_TOOBIG:
584 rel_type = ICMP_DEST_UNREACH;
585 rel_code = ICMP_FRAG_NEEDED;
588 rel_type = ICMP_REDIRECT;
589 rel_code = ICMP_REDIR_HOST;
594 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
597 skb2 = skb_clone(skb, GFP_ATOMIC);
603 skb_pull(skb2, offset);
604 skb_reset_network_header(skb2);
607 /* Try to guess incoming interface */
608 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
611 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
615 skb2->dev = rt->dst.dev;
617 /* route "incoming" packet */
618 if (rt->rt_flags & RTCF_LOCAL) {
621 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
622 eiph->daddr, eiph->saddr,
625 RT_TOS(eiph->tos), 0);
627 rt->dst.dev->type != ARPHRD_TUNNEL) {
632 skb_dst_set(skb2, &rt->dst);
635 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
637 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
641 /* change mtu on this route */
642 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
643 if (rel_info > dst_mtu(skb_dst(skb2)))
646 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
648 if (rel_type == ICMP_REDIRECT)
649 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
651 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
659 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
660 u8 type, u8 code, int offset, __be32 info)
665 __u32 rel_info = ntohl(info);
668 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
669 &rel_msg, &rel_info, offset);
673 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
675 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
681 skb_pull(skb2, offset);
682 skb_reset_network_header(skb2);
684 /* Try to guess incoming interface */
685 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
688 if (rt && rt->dst.dev)
689 skb2->dev = rt->dst.dev;
691 icmpv6_send(skb2, rel_type, rel_code, rel_info);
701 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
702 const struct ipv6hdr *ipv6h,
705 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
707 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
708 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
710 return IP6_ECN_decapsulate(ipv6h, skb);
713 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
714 const struct ipv6hdr *ipv6h,
717 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
718 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
720 return IP6_ECN_decapsulate(ipv6h, skb);
723 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
724 const struct in6_addr *laddr,
725 const struct in6_addr *raddr)
727 struct __ip6_tnl_parm *p = &t->parms;
728 int ltype = ipv6_addr_type(laddr);
729 int rtype = ipv6_addr_type(raddr);
732 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
733 flags = IP6_TNL_F_CAP_PER_PACKET;
734 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
735 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
736 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
737 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
738 if (ltype&IPV6_ADDR_UNICAST)
739 flags |= IP6_TNL_F_CAP_XMIT;
740 if (rtype&IPV6_ADDR_UNICAST)
741 flags |= IP6_TNL_F_CAP_RCV;
745 EXPORT_SYMBOL(ip6_tnl_get_cap);
747 /* called with rcu_read_lock() */
748 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
749 const struct in6_addr *laddr,
750 const struct in6_addr *raddr)
752 struct __ip6_tnl_parm *p = &t->parms;
754 struct net *net = t->net;
756 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
757 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
758 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
759 struct net_device *ldev = NULL;
762 ldev = dev_get_by_index_rcu(net, p->link);
764 if ((ipv6_addr_is_multicast(laddr) ||
765 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
766 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
771 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
774 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
775 * @skb: received socket buffer
776 * @protocol: ethernet protocol ID
777 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
782 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
784 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
785 const struct ipv6hdr *ipv6h,
786 struct sk_buff *skb))
789 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
794 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
795 &ipv6h->daddr)) != NULL) {
796 struct pcpu_sw_netstats *tstats;
798 if (t->parms.proto != ipproto && t->parms.proto != 0) {
803 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
808 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
809 t->dev->stats.rx_dropped++;
813 skb->mac_header = skb->network_header;
814 skb_reset_network_header(skb);
815 skb->protocol = htons(protocol);
816 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
818 __skb_tunnel_rx(skb, t->dev, t->net);
820 err = dscp_ecn_decapsulate(t, ipv6h, skb);
823 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
825 ipv6_get_dsfield(ipv6h));
827 ++t->dev->stats.rx_frame_errors;
828 ++t->dev->stats.rx_errors;
834 tstats = this_cpu_ptr(t->dev->tstats);
835 u64_stats_update_begin(&tstats->syncp);
836 tstats->rx_packets++;
837 tstats->rx_bytes += skb->len;
838 u64_stats_update_end(&tstats->syncp);
853 static int ip4ip6_rcv(struct sk_buff *skb)
855 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
856 ip4ip6_dscp_ecn_decapsulate);
859 static int ip6ip6_rcv(struct sk_buff *skb)
861 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
862 ip6ip6_dscp_ecn_decapsulate);
865 struct ipv6_tel_txoption {
866 struct ipv6_txoptions ops;
870 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
872 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
874 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
876 opt->dst_opt[4] = encap_limit;
877 opt->dst_opt[5] = IPV6_TLV_PADN;
880 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
881 opt->ops.opt_nflen = 8;
885 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
886 * @t: the outgoing tunnel device
887 * @hdr: IPv6 header from the incoming packet
890 * Avoid trivial tunneling loop by checking that tunnel exit-point
891 * doesn't match source of incoming packet.
899 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
901 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
904 int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
906 struct __ip6_tnl_parm *p = &t->parms;
908 struct net *net = t->net;
910 if (p->flags & IP6_TNL_F_CAP_XMIT) {
911 struct net_device *ldev = NULL;
915 ldev = dev_get_by_index_rcu(net, p->link);
917 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
918 pr_warn("%s xmit: Local address not yet configured!\n",
920 else if (!ipv6_addr_is_multicast(&p->raddr) &&
921 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
922 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
930 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
933 * ip6_tnl_xmit2 - encapsulate packet and send
934 * @skb: the outgoing socket buffer
935 * @dev: the outgoing tunnel device
936 * @dsfield: dscp code for outer header
937 * @fl: flow of tunneled packet
938 * @encap_limit: encapsulation limit
939 * @pmtu: Path MTU is stored if packet is too big
942 * Build new header and do some sanity checks on the packet before sending
948 * %-EMSGSIZE message too big. return mtu in this case.
951 static int ip6_tnl_xmit2(struct sk_buff *skb,
952 struct net_device *dev,
958 struct ip6_tnl *t = netdev_priv(dev);
959 struct net *net = t->net;
960 struct net_device_stats *stats = &t->dev->stats;
961 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
962 struct ipv6_tel_txoption opt;
963 struct dst_entry *dst = NULL, *ndst = NULL;
964 struct net_device *tdev;
966 unsigned int max_headroom = sizeof(struct ipv6hdr);
970 if (!fl6->flowi6_mark)
971 dst = ip6_tnl_dst_check(t);
973 ndst = ip6_route_output(net, NULL, fl6);
976 goto tx_err_link_failure;
977 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
981 goto tx_err_link_failure;
990 net_warn_ratelimited("%s: Local routing loop detected!\n",
992 goto tx_err_dst_release;
994 mtu = dst_mtu(dst) - sizeof (*ipv6h);
995 if (encap_limit >= 0) {
999 if (mtu < IPV6_MIN_MTU)
1002 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1003 if (skb->len > mtu) {
1006 goto tx_err_dst_release;
1009 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1012 * Okay, now see if we can stuff it in the buffer as-is.
1014 max_headroom += LL_RESERVED_SPACE(tdev);
1016 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1017 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1018 struct sk_buff *new_skb;
1020 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1021 goto tx_err_dst_release;
1024 skb_set_owner_w(new_skb, skb->sk);
1028 if (fl6->flowi6_mark) {
1029 skb_dst_set(skb, dst);
1032 skb_dst_set_noref(skb, dst);
1034 skb->transport_header = skb->network_header;
1036 proto = fl6->flowi6_proto;
1037 if (encap_limit >= 0) {
1038 init_tel_txopt(&opt, encap_limit);
1039 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1042 if (likely(!skb->encapsulation)) {
1043 skb_reset_inner_headers(skb);
1044 skb->encapsulation = 1;
1047 skb_push(skb, sizeof(struct ipv6hdr));
1048 skb_reset_network_header(skb);
1049 ipv6h = ipv6_hdr(skb);
1050 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1051 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
1052 ipv6h->hop_limit = t->parms.hop_limit;
1053 ipv6h->nexthdr = proto;
1054 ipv6h->saddr = fl6->saddr;
1055 ipv6h->daddr = fl6->daddr;
1056 ip6tunnel_xmit(skb, dev);
1058 ip6_tnl_dst_store(t, ndst);
1060 tx_err_link_failure:
1061 stats->tx_carrier_errors++;
1062 dst_link_failure(skb);
1069 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1071 struct ip6_tnl *t = netdev_priv(dev);
1072 const struct iphdr *iph = ip_hdr(skb);
1073 int encap_limit = -1;
1079 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1080 !ip6_tnl_xmit_ctl(t))
1083 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1084 encap_limit = t->parms.encap_limit;
1086 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1087 fl6.flowi6_proto = IPPROTO_IPIP;
1089 dsfield = ipv4_get_dsfield(iph);
1091 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1092 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1094 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1095 fl6.flowi6_mark = skb->mark;
1097 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1099 /* XXX: send ICMP error even if DF is not set. */
1100 if (err == -EMSGSIZE)
1101 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1110 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1112 struct ip6_tnl *t = netdev_priv(dev);
1113 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1114 int encap_limit = -1;
1121 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1122 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1125 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1127 struct ipv6_tlv_tnl_enc_lim *tel;
1128 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1129 if (tel->encap_limit == 0) {
1130 icmpv6_send(skb, ICMPV6_PARAMPROB,
1131 ICMPV6_HDR_FIELD, offset + 2);
1134 encap_limit = tel->encap_limit - 1;
1135 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1136 encap_limit = t->parms.encap_limit;
1138 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1139 fl6.flowi6_proto = IPPROTO_IPV6;
1141 dsfield = ipv6_get_dsfield(ipv6h);
1142 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1143 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1144 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1145 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1146 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1147 fl6.flowi6_mark = skb->mark;
1149 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1151 if (err == -EMSGSIZE)
1152 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1160 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1162 struct ip6_tnl *t = netdev_priv(dev);
1163 struct net_device_stats *stats = &t->dev->stats;
1166 switch (skb->protocol) {
1167 case htons(ETH_P_IP):
1168 ret = ip4ip6_tnl_xmit(skb, dev);
1170 case htons(ETH_P_IPV6):
1171 ret = ip6ip6_tnl_xmit(skb, dev);
1180 return NETDEV_TX_OK;
1184 stats->tx_dropped++;
1186 return NETDEV_TX_OK;
1189 static void ip6_tnl_link_config(struct ip6_tnl *t)
1191 struct net_device *dev = t->dev;
1192 struct __ip6_tnl_parm *p = &t->parms;
1193 struct flowi6 *fl6 = &t->fl.u.ip6;
1195 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1196 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1198 /* Set up flowi template */
1199 fl6->saddr = p->laddr;
1200 fl6->daddr = p->raddr;
1201 fl6->flowi6_oif = p->link;
1204 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1205 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1206 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1207 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1209 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1210 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1212 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1213 dev->flags |= IFF_POINTOPOINT;
1215 dev->flags &= ~IFF_POINTOPOINT;
1217 dev->iflink = p->link;
1219 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1220 int strict = (ipv6_addr_type(&p->raddr) &
1221 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1223 struct rt6_info *rt = rt6_lookup(t->net,
1224 &p->raddr, &p->laddr,
1231 dev->hard_header_len = rt->dst.dev->hard_header_len +
1232 sizeof (struct ipv6hdr);
1234 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
1235 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1238 if (dev->mtu < IPV6_MIN_MTU)
1239 dev->mtu = IPV6_MIN_MTU;
1246 * ip6_tnl_change - update the tunnel parameters
1247 * @t: tunnel to be changed
1248 * @p: tunnel configuration parameters
1251 * ip6_tnl_change() updates the tunnel parameters
1255 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1257 t->parms.laddr = p->laddr;
1258 t->parms.raddr = p->raddr;
1259 t->parms.flags = p->flags;
1260 t->parms.hop_limit = p->hop_limit;
1261 t->parms.encap_limit = p->encap_limit;
1262 t->parms.flowinfo = p->flowinfo;
1263 t->parms.link = p->link;
1264 t->parms.proto = p->proto;
1265 ip6_tnl_dst_reset(t);
1266 ip6_tnl_link_config(t);
1270 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1272 struct net *net = t->net;
1273 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1276 ip6_tnl_unlink(ip6n, t);
1278 err = ip6_tnl_change(t, p);
1279 ip6_tnl_link(ip6n, t);
1280 netdev_state_change(t->dev);
1285 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1287 p->laddr = u->laddr;
1288 p->raddr = u->raddr;
1289 p->flags = u->flags;
1290 p->hop_limit = u->hop_limit;
1291 p->encap_limit = u->encap_limit;
1292 p->flowinfo = u->flowinfo;
1294 p->proto = u->proto;
1295 memcpy(p->name, u->name, sizeof(u->name));
1299 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1301 u->laddr = p->laddr;
1302 u->raddr = p->raddr;
1303 u->flags = p->flags;
1304 u->hop_limit = p->hop_limit;
1305 u->encap_limit = p->encap_limit;
1306 u->flowinfo = p->flowinfo;
1308 u->proto = p->proto;
1309 memcpy(u->name, p->name, sizeof(u->name));
1313 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1314 * @dev: virtual device associated with tunnel
1315 * @ifr: parameters passed from userspace
1316 * @cmd: command to be performed
1319 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1322 * The possible commands are the following:
1323 * %SIOCGETTUNNEL: get tunnel parameters for device
1324 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1325 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1326 * %SIOCDELTUNNEL: delete tunnel
1328 * The fallback device "ip6tnl0", created during module
1329 * initialization, can be used for creating other tunnel devices.
1333 * %-EFAULT if unable to copy data to or from userspace,
1334 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1335 * %-EINVAL if passed tunnel parameters are invalid,
1336 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1337 * %-ENODEV if attempting to change or delete a nonexisting device
1341 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1344 struct ip6_tnl_parm p;
1345 struct __ip6_tnl_parm p1;
1346 struct ip6_tnl *t = netdev_priv(dev);
1347 struct net *net = t->net;
1348 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1352 if (dev == ip6n->fb_tnl_dev) {
1353 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1357 ip6_tnl_parm_from_user(&p1, &p);
1358 t = ip6_tnl_locate(net, &p1, 0);
1360 t = netdev_priv(dev);
1362 memset(&p, 0, sizeof(p));
1364 ip6_tnl_parm_to_user(&p, &t->parms);
1365 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1372 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1375 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1378 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1381 ip6_tnl_parm_from_user(&p1, &p);
1382 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1383 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1385 if (t->dev != dev) {
1390 t = netdev_priv(dev);
1392 err = ip6_tnl_update(t, &p1);
1396 ip6_tnl_parm_to_user(&p, &t->parms);
1397 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1401 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1405 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1408 if (dev == ip6n->fb_tnl_dev) {
1410 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1413 ip6_tnl_parm_from_user(&p1, &p);
1414 t = ip6_tnl_locate(net, &p1, 0);
1418 if (t->dev == ip6n->fb_tnl_dev)
1423 unregister_netdevice(dev);
1432 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1433 * @dev: virtual device associated with tunnel
1434 * @new_mtu: the new mtu
1438 * %-EINVAL if mtu too small
1442 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1444 struct ip6_tnl *tnl = netdev_priv(dev);
1446 if (tnl->parms.proto == IPPROTO_IPIP) {
1450 if (new_mtu < IPV6_MIN_MTU)
1453 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1460 static const struct net_device_ops ip6_tnl_netdev_ops = {
1461 .ndo_uninit = ip6_tnl_dev_uninit,
1462 .ndo_start_xmit = ip6_tnl_xmit,
1463 .ndo_do_ioctl = ip6_tnl_ioctl,
1464 .ndo_change_mtu = ip6_tnl_change_mtu,
1465 .ndo_get_stats = ip6_get_stats,
1470 * ip6_tnl_dev_setup - setup virtual tunnel device
1471 * @dev: virtual device associated with tunnel
1474 * Initialize function pointers and device parameters
1477 static void ip6_tnl_dev_setup(struct net_device *dev)
1481 dev->netdev_ops = &ip6_tnl_netdev_ops;
1482 dev->destructor = ip6_dev_free;
1484 dev->type = ARPHRD_TUNNEL6;
1485 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1486 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1487 t = netdev_priv(dev);
1488 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1490 dev->flags |= IFF_NOARP;
1491 dev->addr_len = sizeof(struct in6_addr);
1492 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1493 /* This perm addr will be used as interface identifier by IPv6 */
1494 dev->addr_assign_type = NET_ADDR_RANDOM;
1495 eth_random_addr(dev->perm_addr);
1500 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1501 * @dev: virtual device associated with tunnel
1505 ip6_tnl_dev_init_gen(struct net_device *dev)
1507 struct ip6_tnl *t = netdev_priv(dev);
1510 t->net = dev_net(dev);
1511 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1518 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1519 * @dev: virtual device associated with tunnel
1522 static int ip6_tnl_dev_init(struct net_device *dev)
1524 struct ip6_tnl *t = netdev_priv(dev);
1525 int err = ip6_tnl_dev_init_gen(dev);
1529 ip6_tnl_link_config(t);
1534 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1535 * @dev: fallback device
1540 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1542 struct ip6_tnl *t = netdev_priv(dev);
1543 struct net *net = dev_net(dev);
1544 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1545 int err = ip6_tnl_dev_init_gen(dev);
1550 t->parms.proto = IPPROTO_IPV6;
1553 ip6_tnl_link_config(t);
1555 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1559 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1563 if (!data || !data[IFLA_IPTUN_PROTO])
1566 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1567 if (proto != IPPROTO_IPV6 &&
1568 proto != IPPROTO_IPIP &&
1575 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1576 struct __ip6_tnl_parm *parms)
1578 memset(parms, 0, sizeof(*parms));
1583 if (data[IFLA_IPTUN_LINK])
1584 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1586 if (data[IFLA_IPTUN_LOCAL])
1587 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1588 sizeof(struct in6_addr));
1590 if (data[IFLA_IPTUN_REMOTE])
1591 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1592 sizeof(struct in6_addr));
1594 if (data[IFLA_IPTUN_TTL])
1595 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1597 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1598 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1600 if (data[IFLA_IPTUN_FLOWINFO])
1601 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1603 if (data[IFLA_IPTUN_FLAGS])
1604 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1606 if (data[IFLA_IPTUN_PROTO])
1607 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1610 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1611 struct nlattr *tb[], struct nlattr *data[])
1613 struct net *net = dev_net(dev);
1616 nt = netdev_priv(dev);
1617 ip6_tnl_netlink_parms(data, &nt->parms);
1619 if (ip6_tnl_locate(net, &nt->parms, 0))
1622 return ip6_tnl_create2(dev);
1625 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1626 struct nlattr *data[])
1628 struct ip6_tnl *t = netdev_priv(dev);
1629 struct __ip6_tnl_parm p;
1630 struct net *net = t->net;
1631 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1633 if (dev == ip6n->fb_tnl_dev)
1636 ip6_tnl_netlink_parms(data, &p);
1638 t = ip6_tnl_locate(net, &p, 0);
1644 t = netdev_priv(dev);
1646 return ip6_tnl_update(t, &p);
1649 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1651 struct net *net = dev_net(dev);
1652 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1654 if (dev != ip6n->fb_tnl_dev)
1655 unregister_netdevice_queue(dev, head);
1658 static size_t ip6_tnl_get_size(const struct net_device *dev)
1661 /* IFLA_IPTUN_LINK */
1663 /* IFLA_IPTUN_LOCAL */
1664 nla_total_size(sizeof(struct in6_addr)) +
1665 /* IFLA_IPTUN_REMOTE */
1666 nla_total_size(sizeof(struct in6_addr)) +
1667 /* IFLA_IPTUN_TTL */
1669 /* IFLA_IPTUN_ENCAP_LIMIT */
1671 /* IFLA_IPTUN_FLOWINFO */
1673 /* IFLA_IPTUN_FLAGS */
1675 /* IFLA_IPTUN_PROTO */
1680 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1682 struct ip6_tnl *tunnel = netdev_priv(dev);
1683 struct __ip6_tnl_parm *parm = &tunnel->parms;
1685 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1686 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1688 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1690 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1691 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1692 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1693 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1694 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1695 goto nla_put_failure;
1702 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1703 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1704 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1705 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1706 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1707 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1708 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1709 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1710 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1713 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1715 .maxtype = IFLA_IPTUN_MAX,
1716 .policy = ip6_tnl_policy,
1717 .priv_size = sizeof(struct ip6_tnl),
1718 .setup = ip6_tnl_dev_setup,
1719 .validate = ip6_tnl_validate,
1720 .newlink = ip6_tnl_newlink,
1721 .changelink = ip6_tnl_changelink,
1722 .dellink = ip6_tnl_dellink,
1723 .get_size = ip6_tnl_get_size,
1724 .fill_info = ip6_tnl_fill_info,
1727 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1728 .handler = ip4ip6_rcv,
1729 .err_handler = ip4ip6_err,
1733 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1734 .handler = ip6ip6_rcv,
1735 .err_handler = ip6ip6_err,
1739 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1741 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1742 struct net_device *dev, *aux;
1747 for_each_netdev_safe(net, dev, aux)
1748 if (dev->rtnl_link_ops == &ip6_link_ops)
1749 unregister_netdevice_queue(dev, &list);
1751 for (h = 0; h < HASH_SIZE; h++) {
1752 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1754 /* If dev is in the same netns, it has already
1755 * been added to the list by the previous loop.
1757 if (!net_eq(dev_net(t->dev), net))
1758 unregister_netdevice_queue(t->dev, &list);
1759 t = rtnl_dereference(t->next);
1763 unregister_netdevice_many(&list);
1766 static int __net_init ip6_tnl_init_net(struct net *net)
1768 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1769 struct ip6_tnl *t = NULL;
1772 ip6n->tnls[0] = ip6n->tnls_wc;
1773 ip6n->tnls[1] = ip6n->tnls_r_l;
1776 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1777 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
1779 if (!ip6n->fb_tnl_dev)
1781 dev_net_set(ip6n->fb_tnl_dev, net);
1782 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1783 /* FB netdevice is special: we have one, and only one per netns.
1784 * Allowing to move it to another netns is clearly unsafe.
1786 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1788 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1792 err = register_netdev(ip6n->fb_tnl_dev);
1796 t = netdev_priv(ip6n->fb_tnl_dev);
1798 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1802 ip6_dev_free(ip6n->fb_tnl_dev);
1807 static void __net_exit ip6_tnl_exit_net(struct net *net)
1810 ip6_tnl_destroy_tunnels(net);
1814 static struct pernet_operations ip6_tnl_net_ops = {
1815 .init = ip6_tnl_init_net,
1816 .exit = ip6_tnl_exit_net,
1817 .id = &ip6_tnl_net_id,
1818 .size = sizeof(struct ip6_tnl_net),
1822 * ip6_tunnel_init - register protocol and reserve needed resources
1824 * Return: 0 on success
1827 static int __init ip6_tunnel_init(void)
1831 err = register_pernet_device(&ip6_tnl_net_ops);
1835 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1837 pr_err("%s: can't register ip4ip6\n", __func__);
1841 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1843 pr_err("%s: can't register ip6ip6\n", __func__);
1846 err = rtnl_link_register(&ip6_link_ops);
1848 goto rtnl_link_failed;
1853 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1855 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1857 unregister_pernet_device(&ip6_tnl_net_ops);
1863 * ip6_tunnel_cleanup - free resources and unregister protocol
1866 static void __exit ip6_tunnel_cleanup(void)
1868 rtnl_link_unregister(&ip6_link_ops);
1869 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1870 pr_info("%s: can't deregister ip4ip6\n", __func__);
1872 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1873 pr_info("%s: can't deregister ip6ip6\n", __func__);
1875 unregister_pernet_device(&ip6_tnl_net_ops);
1878 module_init(ip6_tunnel_init);
1879 module_exit(ip6_tunnel_cleanup);