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);
276 err = register_netdevice(dev);
280 strcpy(t->parms.name, dev->name);
281 dev->rtnl_link_ops = &ip6_link_ops;
284 ip6_tnl_link(ip6n, t);
292 * ip6_tnl_create - create a new tunnel
293 * @p: tunnel parameters
294 * @pt: pointer to new tunnel
297 * Create tunnel matching given parameters.
300 * created tunnel or NULL
303 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
305 struct net_device *dev;
311 strlcpy(name, p->name, IFNAMSIZ);
313 sprintf(name, "ip6tnl%%d");
315 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
320 dev_net_set(dev, net);
322 t = netdev_priv(dev);
324 t->net = dev_net(dev);
325 err = ip6_tnl_create2(dev);
338 * ip6_tnl_locate - find or create tunnel matching given parameters
339 * @p: tunnel parameters
340 * @create: != 0 if allowed to create new tunnel if no match found
343 * ip6_tnl_locate() first tries to locate an existing tunnel
344 * based on @parms. If this is unsuccessful, but @create is set a new
345 * tunnel device is created and registered for use.
348 * matching tunnel or NULL
351 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
352 struct __ip6_tnl_parm *p, int create)
354 const struct in6_addr *remote = &p->raddr;
355 const struct in6_addr *local = &p->laddr;
356 struct ip6_tnl __rcu **tp;
358 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
360 for (tp = ip6_tnl_bucket(ip6n, p);
361 (t = rtnl_dereference(*tp)) != NULL;
363 if (ipv6_addr_equal(local, &t->parms.laddr) &&
364 ipv6_addr_equal(remote, &t->parms.raddr)) {
373 return ip6_tnl_create(net, p);
377 * ip6_tnl_dev_uninit - tunnel device uninitializer
378 * @dev: the device to be destroyed
381 * ip6_tnl_dev_uninit() removes tunnel from its list
385 ip6_tnl_dev_uninit(struct net_device *dev)
387 struct ip6_tnl *t = netdev_priv(dev);
388 struct net *net = t->net;
389 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
391 if (dev == ip6n->fb_tnl_dev)
392 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
394 ip6_tnl_unlink(ip6n, t);
395 ip6_tnl_dst_reset(t);
400 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
401 * @skb: received socket buffer
404 * 0 if none was found,
405 * else index to encapsulation limit
408 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
410 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
411 __u8 nexthdr = ipv6h->nexthdr;
412 __u16 off = sizeof(*ipv6h);
414 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
416 struct ipv6_opt_hdr *hdr;
417 if (raw + off + sizeof(*hdr) > skb->data &&
418 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
421 hdr = (struct ipv6_opt_hdr *) (raw + off);
422 if (nexthdr == NEXTHDR_FRAGMENT) {
423 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
424 if (frag_hdr->frag_off)
427 } else if (nexthdr == NEXTHDR_AUTH) {
428 optlen = (hdr->hdrlen + 2) << 2;
430 optlen = ipv6_optlen(hdr);
432 if (nexthdr == NEXTHDR_DEST) {
435 struct ipv6_tlv_tnl_enc_lim *tel;
437 /* No more room for encapsulation limit */
438 if (i + sizeof (*tel) > off + optlen)
441 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
442 /* return index of option if found and valid */
443 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
446 /* else jump to next option */
448 i += tel->length + 2;
453 nexthdr = hdr->nexthdr;
458 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
461 * ip6_tnl_err - tunnel error handler
464 * ip6_tnl_err() should handle errors in the tunnel according
465 * to the specifications in RFC 2473.
469 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
470 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
472 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
475 u8 rel_type = ICMPV6_DEST_UNREACH;
476 u8 rel_code = ICMPV6_ADDR_UNREACH;
481 /* If the packet doesn't contain the original IPv6 header we are
482 in trouble since we might need the source address for further
483 processing of the error. */
486 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
487 &ipv6h->saddr)) == NULL)
490 if (t->parms.proto != ipproto && t->parms.proto != 0)
497 struct ipv6_tlv_tnl_enc_lim *tel;
499 case ICMPV6_DEST_UNREACH:
500 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
504 case ICMPV6_TIME_EXCEED:
505 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
506 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
511 case ICMPV6_PARAMPROB:
513 if ((*code) == ICMPV6_HDR_FIELD)
514 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
516 if (teli && teli == *info - 2) {
517 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
518 if (tel->encap_limit == 0) {
519 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
524 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
528 case ICMPV6_PKT_TOOBIG:
529 mtu = *info - offset;
530 if (mtu < IPV6_MIN_MTU)
534 if ((len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
535 rel_type = ICMPV6_PKT_TOOBIG;
554 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
555 u8 type, u8 code, int offset, __be32 info)
560 __u32 rel_info = ntohl(info);
562 struct sk_buff *skb2;
563 const struct iphdr *eiph;
567 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
568 &rel_msg, &rel_info, offset);
576 case ICMPV6_DEST_UNREACH:
577 if (rel_code != ICMPV6_ADDR_UNREACH)
579 rel_type = ICMP_DEST_UNREACH;
580 rel_code = ICMP_HOST_UNREACH;
582 case ICMPV6_PKT_TOOBIG:
585 rel_type = ICMP_DEST_UNREACH;
586 rel_code = ICMP_FRAG_NEEDED;
589 rel_type = ICMP_REDIRECT;
590 rel_code = ICMP_REDIR_HOST;
595 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
598 skb2 = skb_clone(skb, GFP_ATOMIC);
604 skb_pull(skb2, offset);
605 skb_reset_network_header(skb2);
608 /* Try to guess incoming interface */
609 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
612 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
616 skb2->dev = rt->dst.dev;
618 /* route "incoming" packet */
619 if (rt->rt_flags & RTCF_LOCAL) {
622 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
623 eiph->daddr, eiph->saddr,
626 RT_TOS(eiph->tos), 0);
628 rt->dst.dev->type != ARPHRD_TUNNEL) {
633 skb_dst_set(skb2, &rt->dst);
636 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
638 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
642 /* change mtu on this route */
643 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
644 if (rel_info > dst_mtu(skb_dst(skb2)))
647 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
649 if (rel_type == ICMP_REDIRECT)
650 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
652 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
660 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
661 u8 type, u8 code, int offset, __be32 info)
666 __u32 rel_info = ntohl(info);
669 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
670 &rel_msg, &rel_info, offset);
674 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
676 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
682 skb_pull(skb2, offset);
683 skb_reset_network_header(skb2);
685 /* Try to guess incoming interface */
686 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
689 if (rt && rt->dst.dev)
690 skb2->dev = rt->dst.dev;
692 icmpv6_send(skb2, rel_type, rel_code, rel_info);
702 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
703 const struct ipv6hdr *ipv6h,
706 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
708 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
709 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
711 return IP6_ECN_decapsulate(ipv6h, skb);
714 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
715 const struct ipv6hdr *ipv6h,
718 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
719 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
721 return IP6_ECN_decapsulate(ipv6h, skb);
724 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
725 const struct in6_addr *laddr,
726 const struct in6_addr *raddr)
728 struct __ip6_tnl_parm *p = &t->parms;
729 int ltype = ipv6_addr_type(laddr);
730 int rtype = ipv6_addr_type(raddr);
733 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
734 flags = IP6_TNL_F_CAP_PER_PACKET;
735 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
736 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
737 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
738 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
739 if (ltype&IPV6_ADDR_UNICAST)
740 flags |= IP6_TNL_F_CAP_XMIT;
741 if (rtype&IPV6_ADDR_UNICAST)
742 flags |= IP6_TNL_F_CAP_RCV;
746 EXPORT_SYMBOL(ip6_tnl_get_cap);
748 /* called with rcu_read_lock() */
749 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
750 const struct in6_addr *laddr,
751 const struct in6_addr *raddr)
753 struct __ip6_tnl_parm *p = &t->parms;
755 struct net *net = t->net;
757 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
758 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
759 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
760 struct net_device *ldev = NULL;
763 ldev = dev_get_by_index_rcu(net, p->link);
765 if ((ipv6_addr_is_multicast(laddr) ||
766 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
767 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
772 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
775 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
776 * @skb: received socket buffer
777 * @protocol: ethernet protocol ID
778 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
783 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
785 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
786 const struct ipv6hdr *ipv6h,
787 struct sk_buff *skb))
790 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
795 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
796 &ipv6h->daddr)) != NULL) {
797 struct pcpu_sw_netstats *tstats;
799 if (t->parms.proto != ipproto && t->parms.proto != 0) {
804 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
809 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
810 t->dev->stats.rx_dropped++;
814 skb->mac_header = skb->network_header;
815 skb_reset_network_header(skb);
816 skb->protocol = htons(protocol);
817 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
819 __skb_tunnel_rx(skb, t->dev, t->net);
821 err = dscp_ecn_decapsulate(t, ipv6h, skb);
824 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
826 ipv6_get_dsfield(ipv6h));
828 ++t->dev->stats.rx_frame_errors;
829 ++t->dev->stats.rx_errors;
835 tstats = this_cpu_ptr(t->dev->tstats);
836 u64_stats_update_begin(&tstats->syncp);
837 tstats->rx_packets++;
838 tstats->rx_bytes += skb->len;
839 u64_stats_update_end(&tstats->syncp);
854 static int ip4ip6_rcv(struct sk_buff *skb)
856 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
857 ip4ip6_dscp_ecn_decapsulate);
860 static int ip6ip6_rcv(struct sk_buff *skb)
862 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
863 ip6ip6_dscp_ecn_decapsulate);
866 struct ipv6_tel_txoption {
867 struct ipv6_txoptions ops;
871 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
873 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
875 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
877 opt->dst_opt[4] = encap_limit;
878 opt->dst_opt[5] = IPV6_TLV_PADN;
881 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
882 opt->ops.opt_nflen = 8;
886 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
887 * @t: the outgoing tunnel device
888 * @hdr: IPv6 header from the incoming packet
891 * Avoid trivial tunneling loop by checking that tunnel exit-point
892 * doesn't match source of incoming packet.
900 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
902 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
905 int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
907 struct __ip6_tnl_parm *p = &t->parms;
909 struct net *net = t->net;
911 if (p->flags & IP6_TNL_F_CAP_XMIT) {
912 struct net_device *ldev = NULL;
916 ldev = dev_get_by_index_rcu(net, p->link);
918 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
919 pr_warn("%s xmit: Local address not yet configured!\n",
921 else if (!ipv6_addr_is_multicast(&p->raddr) &&
922 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
923 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
931 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
934 * ip6_tnl_xmit2 - encapsulate packet and send
935 * @skb: the outgoing socket buffer
936 * @dev: the outgoing tunnel device
937 * @dsfield: dscp code for outer header
938 * @fl: flow of tunneled packet
939 * @encap_limit: encapsulation limit
940 * @pmtu: Path MTU is stored if packet is too big
943 * Build new header and do some sanity checks on the packet before sending
949 * %-EMSGSIZE message too big. return mtu in this case.
952 static int ip6_tnl_xmit2(struct sk_buff *skb,
953 struct net_device *dev,
959 struct ip6_tnl *t = netdev_priv(dev);
960 struct net *net = t->net;
961 struct net_device_stats *stats = &t->dev->stats;
962 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
963 struct ipv6_tel_txoption opt;
964 struct dst_entry *dst = NULL, *ndst = NULL;
965 struct net_device *tdev;
967 unsigned int max_headroom = sizeof(struct ipv6hdr);
971 if (!fl6->flowi6_mark)
972 dst = ip6_tnl_dst_check(t);
974 ndst = ip6_route_output(net, NULL, fl6);
977 goto tx_err_link_failure;
978 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
982 goto tx_err_link_failure;
991 net_warn_ratelimited("%s: Local routing loop detected!\n",
993 goto tx_err_dst_release;
995 mtu = dst_mtu(dst) - sizeof(*ipv6h);
996 if (encap_limit >= 0) {
1000 if (mtu < IPV6_MIN_MTU)
1003 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1004 if (skb->len > mtu) {
1007 goto tx_err_dst_release;
1010 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1013 * Okay, now see if we can stuff it in the buffer as-is.
1015 max_headroom += LL_RESERVED_SPACE(tdev);
1017 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1018 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1019 struct sk_buff *new_skb;
1021 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1022 goto tx_err_dst_release;
1025 skb_set_owner_w(new_skb, skb->sk);
1029 if (fl6->flowi6_mark) {
1030 skb_dst_set(skb, dst);
1033 skb_dst_set_noref(skb, dst);
1035 skb->transport_header = skb->network_header;
1037 proto = fl6->flowi6_proto;
1038 if (encap_limit >= 0) {
1039 init_tel_txopt(&opt, encap_limit);
1040 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1043 if (likely(!skb->encapsulation)) {
1044 skb_reset_inner_headers(skb);
1045 skb->encapsulation = 1;
1048 skb_push(skb, sizeof(struct ipv6hdr));
1049 skb_reset_network_header(skb);
1050 ipv6h = ipv6_hdr(skb);
1051 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1052 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
1053 ipv6h->hop_limit = t->parms.hop_limit;
1054 ipv6h->nexthdr = proto;
1055 ipv6h->saddr = fl6->saddr;
1056 ipv6h->daddr = fl6->daddr;
1057 ip6tunnel_xmit(skb, dev);
1059 ip6_tnl_dst_store(t, ndst);
1061 tx_err_link_failure:
1062 stats->tx_carrier_errors++;
1063 dst_link_failure(skb);
1070 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1072 struct ip6_tnl *t = netdev_priv(dev);
1073 const struct iphdr *iph = ip_hdr(skb);
1074 int encap_limit = -1;
1080 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1081 !ip6_tnl_xmit_ctl(t))
1084 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1085 encap_limit = t->parms.encap_limit;
1087 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1088 fl6.flowi6_proto = IPPROTO_IPIP;
1090 dsfield = ipv4_get_dsfield(iph);
1092 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1093 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1095 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1096 fl6.flowi6_mark = skb->mark;
1098 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1100 /* XXX: send ICMP error even if DF is not set. */
1101 if (err == -EMSGSIZE)
1102 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1111 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1113 struct ip6_tnl *t = netdev_priv(dev);
1114 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1115 int encap_limit = -1;
1122 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1123 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1126 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1128 struct ipv6_tlv_tnl_enc_lim *tel;
1129 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1130 if (tel->encap_limit == 0) {
1131 icmpv6_send(skb, ICMPV6_PARAMPROB,
1132 ICMPV6_HDR_FIELD, offset + 2);
1135 encap_limit = tel->encap_limit - 1;
1136 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1137 encap_limit = t->parms.encap_limit;
1139 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1140 fl6.flowi6_proto = IPPROTO_IPV6;
1142 dsfield = ipv6_get_dsfield(ipv6h);
1143 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1144 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1145 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1146 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1147 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1148 fl6.flowi6_mark = skb->mark;
1150 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1152 if (err == -EMSGSIZE)
1153 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1161 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1163 struct ip6_tnl *t = netdev_priv(dev);
1164 struct net_device_stats *stats = &t->dev->stats;
1167 switch (skb->protocol) {
1168 case htons(ETH_P_IP):
1169 ret = ip4ip6_tnl_xmit(skb, dev);
1171 case htons(ETH_P_IPV6):
1172 ret = ip6ip6_tnl_xmit(skb, dev);
1181 return NETDEV_TX_OK;
1185 stats->tx_dropped++;
1187 return NETDEV_TX_OK;
1190 static void ip6_tnl_link_config(struct ip6_tnl *t)
1192 struct net_device *dev = t->dev;
1193 struct __ip6_tnl_parm *p = &t->parms;
1194 struct flowi6 *fl6 = &t->fl.u.ip6;
1196 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1197 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1199 /* Set up flowi template */
1200 fl6->saddr = p->laddr;
1201 fl6->daddr = p->raddr;
1202 fl6->flowi6_oif = p->link;
1205 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1206 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1207 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1208 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1210 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1211 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1213 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1214 dev->flags |= IFF_POINTOPOINT;
1216 dev->flags &= ~IFF_POINTOPOINT;
1218 dev->iflink = p->link;
1220 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1221 int strict = (ipv6_addr_type(&p->raddr) &
1222 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1224 struct rt6_info *rt = rt6_lookup(t->net,
1225 &p->raddr, &p->laddr,
1232 dev->hard_header_len = rt->dst.dev->hard_header_len +
1233 sizeof(struct ipv6hdr);
1235 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
1236 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1239 if (dev->mtu < IPV6_MIN_MTU)
1240 dev->mtu = IPV6_MIN_MTU;
1247 * ip6_tnl_change - update the tunnel parameters
1248 * @t: tunnel to be changed
1249 * @p: tunnel configuration parameters
1252 * ip6_tnl_change() updates the tunnel parameters
1256 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1258 t->parms.laddr = p->laddr;
1259 t->parms.raddr = p->raddr;
1260 t->parms.flags = p->flags;
1261 t->parms.hop_limit = p->hop_limit;
1262 t->parms.encap_limit = p->encap_limit;
1263 t->parms.flowinfo = p->flowinfo;
1264 t->parms.link = p->link;
1265 t->parms.proto = p->proto;
1266 ip6_tnl_dst_reset(t);
1267 ip6_tnl_link_config(t);
1271 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1273 struct net *net = t->net;
1274 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1277 ip6_tnl_unlink(ip6n, t);
1279 err = ip6_tnl_change(t, p);
1280 ip6_tnl_link(ip6n, t);
1281 netdev_state_change(t->dev);
1286 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1288 p->laddr = u->laddr;
1289 p->raddr = u->raddr;
1290 p->flags = u->flags;
1291 p->hop_limit = u->hop_limit;
1292 p->encap_limit = u->encap_limit;
1293 p->flowinfo = u->flowinfo;
1295 p->proto = u->proto;
1296 memcpy(p->name, u->name, sizeof(u->name));
1300 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1302 u->laddr = p->laddr;
1303 u->raddr = p->raddr;
1304 u->flags = p->flags;
1305 u->hop_limit = p->hop_limit;
1306 u->encap_limit = p->encap_limit;
1307 u->flowinfo = p->flowinfo;
1309 u->proto = p->proto;
1310 memcpy(u->name, p->name, sizeof(u->name));
1314 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1315 * @dev: virtual device associated with tunnel
1316 * @ifr: parameters passed from userspace
1317 * @cmd: command to be performed
1320 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1323 * The possible commands are the following:
1324 * %SIOCGETTUNNEL: get tunnel parameters for device
1325 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1326 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1327 * %SIOCDELTUNNEL: delete tunnel
1329 * The fallback device "ip6tnl0", created during module
1330 * initialization, can be used for creating other tunnel devices.
1334 * %-EFAULT if unable to copy data to or from userspace,
1335 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1336 * %-EINVAL if passed tunnel parameters are invalid,
1337 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1338 * %-ENODEV if attempting to change or delete a nonexisting device
1342 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1345 struct ip6_tnl_parm p;
1346 struct __ip6_tnl_parm p1;
1347 struct ip6_tnl *t = netdev_priv(dev);
1348 struct net *net = t->net;
1349 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1353 if (dev == ip6n->fb_tnl_dev) {
1354 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1358 ip6_tnl_parm_from_user(&p1, &p);
1359 t = ip6_tnl_locate(net, &p1, 0);
1361 t = netdev_priv(dev);
1363 memset(&p, 0, sizeof(p));
1365 ip6_tnl_parm_to_user(&p, &t->parms);
1366 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1373 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1376 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1379 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1382 ip6_tnl_parm_from_user(&p1, &p);
1383 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1384 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1386 if (t->dev != dev) {
1391 t = netdev_priv(dev);
1393 err = ip6_tnl_update(t, &p1);
1397 ip6_tnl_parm_to_user(&p, &t->parms);
1398 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1402 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1406 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1409 if (dev == ip6n->fb_tnl_dev) {
1411 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1414 ip6_tnl_parm_from_user(&p1, &p);
1415 t = ip6_tnl_locate(net, &p1, 0);
1419 if (t->dev == ip6n->fb_tnl_dev)
1424 unregister_netdevice(dev);
1433 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1434 * @dev: virtual device associated with tunnel
1435 * @new_mtu: the new mtu
1439 * %-EINVAL if mtu too small
1443 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1445 struct ip6_tnl *tnl = netdev_priv(dev);
1447 if (tnl->parms.proto == IPPROTO_IPIP) {
1451 if (new_mtu < IPV6_MIN_MTU)
1454 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1461 static const struct net_device_ops ip6_tnl_netdev_ops = {
1462 .ndo_init = ip6_tnl_dev_init,
1463 .ndo_uninit = ip6_tnl_dev_uninit,
1464 .ndo_start_xmit = ip6_tnl_xmit,
1465 .ndo_do_ioctl = ip6_tnl_ioctl,
1466 .ndo_change_mtu = ip6_tnl_change_mtu,
1467 .ndo_get_stats = ip6_get_stats,
1472 * ip6_tnl_dev_setup - setup virtual tunnel device
1473 * @dev: virtual device associated with tunnel
1476 * Initialize function pointers and device parameters
1479 static void ip6_tnl_dev_setup(struct net_device *dev)
1483 dev->netdev_ops = &ip6_tnl_netdev_ops;
1484 dev->destructor = ip6_dev_free;
1486 dev->type = ARPHRD_TUNNEL6;
1487 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1488 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
1489 t = netdev_priv(dev);
1490 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1492 dev->flags |= IFF_NOARP;
1493 dev->addr_len = sizeof(struct in6_addr);
1494 netif_keep_dst(dev);
1495 /* This perm addr will be used as interface identifier by IPv6 */
1496 dev->addr_assign_type = NET_ADDR_RANDOM;
1497 eth_random_addr(dev->perm_addr);
1502 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1503 * @dev: virtual device associated with tunnel
1507 ip6_tnl_dev_init_gen(struct net_device *dev)
1509 struct ip6_tnl *t = netdev_priv(dev);
1512 t->net = dev_net(dev);
1513 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1520 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1521 * @dev: virtual device associated with tunnel
1524 static int ip6_tnl_dev_init(struct net_device *dev)
1526 struct ip6_tnl *t = netdev_priv(dev);
1527 int err = ip6_tnl_dev_init_gen(dev);
1531 ip6_tnl_link_config(t);
1536 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1537 * @dev: fallback device
1542 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1544 struct ip6_tnl *t = netdev_priv(dev);
1545 struct net *net = dev_net(dev);
1546 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1548 t->parms.proto = IPPROTO_IPV6;
1551 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1555 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1559 if (!data || !data[IFLA_IPTUN_PROTO])
1562 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1563 if (proto != IPPROTO_IPV6 &&
1564 proto != IPPROTO_IPIP &&
1571 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1572 struct __ip6_tnl_parm *parms)
1574 memset(parms, 0, sizeof(*parms));
1579 if (data[IFLA_IPTUN_LINK])
1580 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1582 if (data[IFLA_IPTUN_LOCAL])
1583 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1584 sizeof(struct in6_addr));
1586 if (data[IFLA_IPTUN_REMOTE])
1587 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1588 sizeof(struct in6_addr));
1590 if (data[IFLA_IPTUN_TTL])
1591 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1593 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1594 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1596 if (data[IFLA_IPTUN_FLOWINFO])
1597 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1599 if (data[IFLA_IPTUN_FLAGS])
1600 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1602 if (data[IFLA_IPTUN_PROTO])
1603 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1606 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1607 struct nlattr *tb[], struct nlattr *data[])
1609 struct net *net = dev_net(dev);
1612 nt = netdev_priv(dev);
1613 ip6_tnl_netlink_parms(data, &nt->parms);
1615 if (ip6_tnl_locate(net, &nt->parms, 0))
1618 return ip6_tnl_create2(dev);
1621 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1622 struct nlattr *data[])
1624 struct ip6_tnl *t = netdev_priv(dev);
1625 struct __ip6_tnl_parm p;
1626 struct net *net = t->net;
1627 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1629 if (dev == ip6n->fb_tnl_dev)
1632 ip6_tnl_netlink_parms(data, &p);
1634 t = ip6_tnl_locate(net, &p, 0);
1640 t = netdev_priv(dev);
1642 return ip6_tnl_update(t, &p);
1645 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1647 struct net *net = dev_net(dev);
1648 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1650 if (dev != ip6n->fb_tnl_dev)
1651 unregister_netdevice_queue(dev, head);
1654 static size_t ip6_tnl_get_size(const struct net_device *dev)
1657 /* IFLA_IPTUN_LINK */
1659 /* IFLA_IPTUN_LOCAL */
1660 nla_total_size(sizeof(struct in6_addr)) +
1661 /* IFLA_IPTUN_REMOTE */
1662 nla_total_size(sizeof(struct in6_addr)) +
1663 /* IFLA_IPTUN_TTL */
1665 /* IFLA_IPTUN_ENCAP_LIMIT */
1667 /* IFLA_IPTUN_FLOWINFO */
1669 /* IFLA_IPTUN_FLAGS */
1671 /* IFLA_IPTUN_PROTO */
1676 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1678 struct ip6_tnl *tunnel = netdev_priv(dev);
1679 struct __ip6_tnl_parm *parm = &tunnel->parms;
1681 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1682 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1684 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1686 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1687 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1688 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1689 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1690 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1691 goto nla_put_failure;
1698 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1699 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1700 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1701 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1702 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1703 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1704 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1705 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1706 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1709 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1711 .maxtype = IFLA_IPTUN_MAX,
1712 .policy = ip6_tnl_policy,
1713 .priv_size = sizeof(struct ip6_tnl),
1714 .setup = ip6_tnl_dev_setup,
1715 .validate = ip6_tnl_validate,
1716 .newlink = ip6_tnl_newlink,
1717 .changelink = ip6_tnl_changelink,
1718 .dellink = ip6_tnl_dellink,
1719 .get_size = ip6_tnl_get_size,
1720 .fill_info = ip6_tnl_fill_info,
1723 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1724 .handler = ip4ip6_rcv,
1725 .err_handler = ip4ip6_err,
1729 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1730 .handler = ip6ip6_rcv,
1731 .err_handler = ip6ip6_err,
1735 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1737 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1738 struct net_device *dev, *aux;
1743 for_each_netdev_safe(net, dev, aux)
1744 if (dev->rtnl_link_ops == &ip6_link_ops)
1745 unregister_netdevice_queue(dev, &list);
1747 for (h = 0; h < HASH_SIZE; h++) {
1748 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1750 /* If dev is in the same netns, it has already
1751 * been added to the list by the previous loop.
1753 if (!net_eq(dev_net(t->dev), net))
1754 unregister_netdevice_queue(t->dev, &list);
1755 t = rtnl_dereference(t->next);
1759 unregister_netdevice_many(&list);
1762 static int __net_init ip6_tnl_init_net(struct net *net)
1764 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1765 struct ip6_tnl *t = NULL;
1768 ip6n->tnls[0] = ip6n->tnls_wc;
1769 ip6n->tnls[1] = ip6n->tnls_r_l;
1772 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1773 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
1775 if (!ip6n->fb_tnl_dev)
1777 dev_net_set(ip6n->fb_tnl_dev, net);
1778 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1779 /* FB netdevice is special: we have one, and only one per netns.
1780 * Allowing to move it to another netns is clearly unsafe.
1782 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1784 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1788 err = register_netdev(ip6n->fb_tnl_dev);
1792 t = netdev_priv(ip6n->fb_tnl_dev);
1794 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1798 ip6_dev_free(ip6n->fb_tnl_dev);
1803 static void __net_exit ip6_tnl_exit_net(struct net *net)
1806 ip6_tnl_destroy_tunnels(net);
1810 static struct pernet_operations ip6_tnl_net_ops = {
1811 .init = ip6_tnl_init_net,
1812 .exit = ip6_tnl_exit_net,
1813 .id = &ip6_tnl_net_id,
1814 .size = sizeof(struct ip6_tnl_net),
1818 * ip6_tunnel_init - register protocol and reserve needed resources
1820 * Return: 0 on success
1823 static int __init ip6_tunnel_init(void)
1827 err = register_pernet_device(&ip6_tnl_net_ops);
1831 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1833 pr_err("%s: can't register ip4ip6\n", __func__);
1837 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1839 pr_err("%s: can't register ip6ip6\n", __func__);
1842 err = rtnl_link_register(&ip6_link_ops);
1844 goto rtnl_link_failed;
1849 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1851 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1853 unregister_pernet_device(&ip6_tnl_net_ops);
1859 * ip6_tunnel_cleanup - free resources and unregister protocol
1862 static void __exit ip6_tunnel_cleanup(void)
1864 rtnl_link_unregister(&ip6_link_ops);
1865 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1866 pr_info("%s: can't deregister ip4ip6\n", __func__);
1868 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1869 pr_info("%s: can't deregister ip6ip6\n", __func__);
1871 unregister_pernet_device(&ip6_tnl_net_ops);
1874 module_init(ip6_tunnel_init);
1875 module_exit(ip6_tunnel_cleanup);