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/if_tunnel.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/if_arp.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <linux/route.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/netfilter_ipv6.h>
42 #include <linux/slab.h>
43 #include <linux/hash.h>
44 #include <linux/etherdevice.h>
46 #include <asm/uaccess.h>
47 #include <linux/atomic.h>
51 #include <net/ip_tunnels.h>
53 #include <net/ip6_route.h>
54 #include <net/addrconf.h>
55 #include <net/ip6_tunnel.h>
57 #include <net/dsfield.h>
58 #include <net/inet_ecn.h>
59 #include <net/net_namespace.h>
60 #include <net/netns/generic.h>
62 MODULE_AUTHOR("Ville Nuorvala");
63 MODULE_DESCRIPTION("IPv6 tunneling device");
64 MODULE_LICENSE("GPL");
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 IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
74 #define IPV6_TCLASS_SHIFT 20
76 #define HASH_SIZE_SHIFT 5
77 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
79 static bool log_ecn_error = true;
80 module_param(log_ecn_error, bool, 0644);
81 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
83 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
85 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
87 return hash_32(hash, HASH_SIZE_SHIFT);
90 static int ip6_tnl_dev_init(struct net_device *dev);
91 static void ip6_tnl_dev_setup(struct net_device *dev);
92 static struct rtnl_link_ops ip6_link_ops __read_mostly;
94 static int ip6_tnl_net_id __read_mostly;
96 /* the IPv6 tunnel fallback device */
97 struct net_device *fb_tnl_dev;
98 /* lists for storing tunnels in use */
99 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
100 struct ip6_tnl __rcu *tnls_wc[1];
101 struct ip6_tnl __rcu **tnls[2];
104 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
106 struct pcpu_tstats tmp, sum = { 0 };
109 for_each_possible_cpu(i) {
111 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
114 start = u64_stats_fetch_begin_bh(&tstats->syncp);
115 tmp.rx_packets = tstats->rx_packets;
116 tmp.rx_bytes = tstats->rx_bytes;
117 tmp.tx_packets = tstats->tx_packets;
118 tmp.tx_bytes = tstats->tx_bytes;
119 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
121 sum.rx_packets += tmp.rx_packets;
122 sum.rx_bytes += tmp.rx_bytes;
123 sum.tx_packets += tmp.tx_packets;
124 sum.tx_bytes += tmp.tx_bytes;
126 dev->stats.rx_packets = sum.rx_packets;
127 dev->stats.rx_bytes = sum.rx_bytes;
128 dev->stats.tx_packets = sum.tx_packets;
129 dev->stats.tx_bytes = sum.tx_bytes;
134 * Locking : hash tables are protected by RCU and RTNL
137 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
139 struct dst_entry *dst = t->dst_cache;
141 if (dst && dst->obsolete &&
142 dst->ops->check(dst, t->dst_cookie) == NULL) {
150 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
152 void ip6_tnl_dst_reset(struct ip6_tnl *t)
154 dst_release(t->dst_cache);
157 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
159 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
161 struct rt6_info *rt = (struct rt6_info *) dst;
162 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
163 dst_release(t->dst_cache);
166 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
169 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
170 * @remote: the address of the tunnel exit-point
171 * @local: the address of the tunnel entry-point
174 * tunnel matching given end-points if found,
175 * else fallback tunnel if its device is up,
179 #define for_each_ip6_tunnel_rcu(start) \
180 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
182 static struct ip6_tnl *
183 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
185 unsigned int hash = HASH(remote, local);
187 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
189 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
190 if (ipv6_addr_equal(local, &t->parms.laddr) &&
191 ipv6_addr_equal(remote, &t->parms.raddr) &&
192 (t->dev->flags & IFF_UP))
195 t = rcu_dereference(ip6n->tnls_wc[0]);
196 if (t && (t->dev->flags & IFF_UP))
203 * ip6_tnl_bucket - get head of list matching given tunnel parameters
204 * @p: parameters containing tunnel end-points
207 * ip6_tnl_bucket() returns the head of the list matching the
208 * &struct in6_addr entries laddr and raddr in @p.
210 * Return: head of IPv6 tunnel list
213 static struct ip6_tnl __rcu **
214 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
216 const struct in6_addr *remote = &p->raddr;
217 const struct in6_addr *local = &p->laddr;
221 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
223 h = HASH(remote, local);
225 return &ip6n->tnls[prio][h];
229 * ip6_tnl_link - add tunnel to hash table
230 * @t: tunnel to be added
234 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
236 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
238 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
239 rcu_assign_pointer(*tp, t);
243 * ip6_tnl_unlink - remove tunnel from hash table
244 * @t: tunnel to be removed
248 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
250 struct ip6_tnl __rcu **tp;
251 struct ip6_tnl *iter;
253 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
254 (iter = rtnl_dereference(*tp)) != NULL;
257 rcu_assign_pointer(*tp, t->next);
263 static void ip6_dev_free(struct net_device *dev)
265 free_percpu(dev->tstats);
269 static int ip6_tnl_create2(struct net_device *dev)
271 struct ip6_tnl *t = netdev_priv(dev);
272 struct net *net = dev_net(dev);
273 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
276 t = netdev_priv(dev);
277 err = ip6_tnl_dev_init(dev);
281 err = register_netdevice(dev);
285 strcpy(t->parms.name, dev->name);
286 dev->rtnl_link_ops = &ip6_link_ops;
289 ip6_tnl_link(ip6n, t);
297 * ip6_tnl_create - create a new tunnel
298 * @p: tunnel parameters
299 * @pt: pointer to new tunnel
302 * Create tunnel matching given parameters.
305 * created tunnel or NULL
308 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
310 struct net_device *dev;
316 strlcpy(name, p->name, IFNAMSIZ);
318 sprintf(name, "ip6tnl%%d");
320 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
324 dev_net_set(dev, net);
326 t = netdev_priv(dev);
328 t->net = dev_net(dev);
329 err = ip6_tnl_create2(dev);
342 * ip6_tnl_locate - find or create tunnel matching given parameters
343 * @p: tunnel parameters
344 * @create: != 0 if allowed to create new tunnel if no match found
347 * ip6_tnl_locate() first tries to locate an existing tunnel
348 * based on @parms. If this is unsuccessful, but @create is set a new
349 * tunnel device is created and registered for use.
352 * matching tunnel or NULL
355 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
356 struct __ip6_tnl_parm *p, int create)
358 const struct in6_addr *remote = &p->raddr;
359 const struct in6_addr *local = &p->laddr;
360 struct ip6_tnl __rcu **tp;
362 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
364 for (tp = ip6_tnl_bucket(ip6n, p);
365 (t = rtnl_dereference(*tp)) != NULL;
367 if (ipv6_addr_equal(local, &t->parms.laddr) &&
368 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_tstats *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), fl6->flowlabel);
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 |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
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 = NULL;
1347 struct net *net = dev_net(dev);
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 memset(&p, 0, sizeof(p));
1363 t = netdev_priv(dev);
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);
1511 t->net = dev_net(dev);
1512 dev->tstats = alloc_percpu(struct pcpu_tstats);
1516 for_each_possible_cpu(i) {
1517 struct pcpu_tstats *ip6_tnl_stats;
1518 ip6_tnl_stats = per_cpu_ptr(dev->tstats, i);
1519 u64_stats_init(&ip6_tnl_stats->syncp);
1525 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1526 * @dev: virtual device associated with tunnel
1529 static int ip6_tnl_dev_init(struct net_device *dev)
1531 struct ip6_tnl *t = netdev_priv(dev);
1532 int err = ip6_tnl_dev_init_gen(dev);
1536 ip6_tnl_link_config(t);
1541 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1542 * @dev: fallback device
1547 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1549 struct ip6_tnl *t = netdev_priv(dev);
1550 struct net *net = dev_net(dev);
1551 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1552 int err = ip6_tnl_dev_init_gen(dev);
1557 t->parms.proto = IPPROTO_IPV6;
1560 ip6_tnl_link_config(t);
1562 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1566 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1573 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1574 if (proto != IPPROTO_IPV6 &&
1575 proto != IPPROTO_IPIP &&
1582 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1583 struct __ip6_tnl_parm *parms)
1585 memset(parms, 0, sizeof(*parms));
1590 if (data[IFLA_IPTUN_LINK])
1591 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1593 if (data[IFLA_IPTUN_LOCAL])
1594 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1595 sizeof(struct in6_addr));
1597 if (data[IFLA_IPTUN_REMOTE])
1598 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1599 sizeof(struct in6_addr));
1601 if (data[IFLA_IPTUN_TTL])
1602 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1604 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1605 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1607 if (data[IFLA_IPTUN_FLOWINFO])
1608 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1610 if (data[IFLA_IPTUN_FLAGS])
1611 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1613 if (data[IFLA_IPTUN_PROTO])
1614 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1617 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1618 struct nlattr *tb[], struct nlattr *data[])
1620 struct net *net = dev_net(dev);
1623 nt = netdev_priv(dev);
1624 ip6_tnl_netlink_parms(data, &nt->parms);
1626 if (ip6_tnl_locate(net, &nt->parms, 0))
1629 return ip6_tnl_create2(dev);
1632 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1633 struct nlattr *data[])
1635 struct ip6_tnl *t = netdev_priv(dev);
1636 struct __ip6_tnl_parm p;
1637 struct net *net = t->net;
1638 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1640 if (dev == ip6n->fb_tnl_dev)
1643 ip6_tnl_netlink_parms(data, &p);
1645 t = ip6_tnl_locate(net, &p, 0);
1651 t = netdev_priv(dev);
1653 return ip6_tnl_update(t, &p);
1656 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1658 struct net *net = dev_net(dev);
1659 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1661 if (dev != ip6n->fb_tnl_dev)
1662 unregister_netdevice_queue(dev, head);
1665 static size_t ip6_tnl_get_size(const struct net_device *dev)
1668 /* IFLA_IPTUN_LINK */
1670 /* IFLA_IPTUN_LOCAL */
1671 nla_total_size(sizeof(struct in6_addr)) +
1672 /* IFLA_IPTUN_REMOTE */
1673 nla_total_size(sizeof(struct in6_addr)) +
1674 /* IFLA_IPTUN_TTL */
1676 /* IFLA_IPTUN_ENCAP_LIMIT */
1678 /* IFLA_IPTUN_FLOWINFO */
1680 /* IFLA_IPTUN_FLAGS */
1682 /* IFLA_IPTUN_PROTO */
1687 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1689 struct ip6_tnl *tunnel = netdev_priv(dev);
1690 struct __ip6_tnl_parm *parm = &tunnel->parms;
1692 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1693 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1695 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1697 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1698 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1699 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1700 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1701 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1702 goto nla_put_failure;
1709 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1710 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1711 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1712 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1713 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1714 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1715 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1716 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1717 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1720 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1722 .maxtype = IFLA_IPTUN_MAX,
1723 .policy = ip6_tnl_policy,
1724 .priv_size = sizeof(struct ip6_tnl),
1725 .setup = ip6_tnl_dev_setup,
1726 .validate = ip6_tnl_validate,
1727 .newlink = ip6_tnl_newlink,
1728 .changelink = ip6_tnl_changelink,
1729 .dellink = ip6_tnl_dellink,
1730 .get_size = ip6_tnl_get_size,
1731 .fill_info = ip6_tnl_fill_info,
1734 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1735 .handler = ip4ip6_rcv,
1736 .err_handler = ip4ip6_err,
1740 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1741 .handler = ip6ip6_rcv,
1742 .err_handler = ip6ip6_err,
1746 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1748 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1749 struct net_device *dev, *aux;
1754 for_each_netdev_safe(net, dev, aux)
1755 if (dev->rtnl_link_ops == &ip6_link_ops)
1756 unregister_netdevice_queue(dev, &list);
1758 for (h = 0; h < HASH_SIZE; h++) {
1759 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1761 /* If dev is in the same netns, it has already
1762 * been added to the list by the previous loop.
1764 if (!net_eq(dev_net(t->dev), net))
1765 unregister_netdevice_queue(t->dev, &list);
1766 t = rtnl_dereference(t->next);
1770 unregister_netdevice_many(&list);
1773 static int __net_init ip6_tnl_init_net(struct net *net)
1775 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1776 struct ip6_tnl *t = NULL;
1779 ip6n->tnls[0] = ip6n->tnls_wc;
1780 ip6n->tnls[1] = ip6n->tnls_r_l;
1783 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1786 if (!ip6n->fb_tnl_dev)
1788 dev_net_set(ip6n->fb_tnl_dev, net);
1789 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1790 /* FB netdevice is special: we have one, and only one per netns.
1791 * Allowing to move it to another netns is clearly unsafe.
1793 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1795 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1799 err = register_netdev(ip6n->fb_tnl_dev);
1803 t = netdev_priv(ip6n->fb_tnl_dev);
1805 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1809 ip6_dev_free(ip6n->fb_tnl_dev);
1814 static void __net_exit ip6_tnl_exit_net(struct net *net)
1817 ip6_tnl_destroy_tunnels(net);
1821 static struct pernet_operations ip6_tnl_net_ops = {
1822 .init = ip6_tnl_init_net,
1823 .exit = ip6_tnl_exit_net,
1824 .id = &ip6_tnl_net_id,
1825 .size = sizeof(struct ip6_tnl_net),
1829 * ip6_tunnel_init - register protocol and reserve needed resources
1831 * Return: 0 on success
1834 static int __init ip6_tunnel_init(void)
1838 err = register_pernet_device(&ip6_tnl_net_ops);
1842 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1844 pr_err("%s: can't register ip4ip6\n", __func__);
1848 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1850 pr_err("%s: can't register ip6ip6\n", __func__);
1853 err = rtnl_link_register(&ip6_link_ops);
1855 goto rtnl_link_failed;
1860 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1862 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1864 unregister_pernet_device(&ip6_tnl_net_ops);
1870 * ip6_tunnel_cleanup - free resources and unregister protocol
1873 static void __exit ip6_tunnel_cleanup(void)
1875 rtnl_link_unregister(&ip6_link_ops);
1876 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1877 pr_info("%s: can't deregister ip4ip6\n", __func__);
1879 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1880 pr_info("%s: can't deregister ip6ip6\n", __func__);
1882 unregister_pernet_device(&ip6_tnl_net_ops);
1885 module_init(ip6_tunnel_init);
1886 module_exit(ip6_tunnel_cleanup);