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_NETDEV("ip6tnl0");
67 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
69 #define IP6_TNL_TRACE(x...) do {;} while(0)
72 #define IPV6_TCLASS_SHIFT 20
74 #define HASH_SIZE_SHIFT 5
75 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
77 static bool log_ecn_error = true;
78 module_param(log_ecn_error, bool, 0644);
79 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
81 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
83 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
85 return hash_32(hash, HASH_SIZE_SHIFT);
88 static int ip6_tnl_dev_init(struct net_device *dev);
89 static void ip6_tnl_dev_setup(struct net_device *dev);
90 static struct rtnl_link_ops ip6_link_ops __read_mostly;
92 static int ip6_tnl_net_id __read_mostly;
94 /* the IPv6 tunnel fallback device */
95 struct net_device *fb_tnl_dev;
96 /* lists for storing tunnels in use */
97 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
98 struct ip6_tnl __rcu *tnls_wc[1];
99 struct ip6_tnl __rcu **tnls[2];
102 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
104 struct pcpu_sw_netstats sum = { 0 };
107 for_each_possible_cpu(i) {
108 const struct pcpu_sw_netstats *tstats =
109 per_cpu_ptr(dev->tstats, i);
111 sum.rx_packets += tstats->rx_packets;
112 sum.rx_bytes += tstats->rx_bytes;
113 sum.tx_packets += tstats->tx_packets;
114 sum.tx_bytes += tstats->tx_bytes;
116 dev->stats.rx_packets = sum.rx_packets;
117 dev->stats.rx_bytes = sum.rx_bytes;
118 dev->stats.tx_packets = sum.tx_packets;
119 dev->stats.tx_bytes = sum.tx_bytes;
124 * Locking : hash tables are protected by RCU and RTNL
127 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
129 struct dst_entry *dst = t->dst_cache;
131 if (dst && dst->obsolete &&
132 dst->ops->check(dst, t->dst_cookie) == NULL) {
140 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
142 void ip6_tnl_dst_reset(struct ip6_tnl *t)
144 dst_release(t->dst_cache);
147 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
149 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
151 struct rt6_info *rt = (struct rt6_info *) dst;
152 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
153 dst_release(t->dst_cache);
156 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
159 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
160 * @remote: the address of the tunnel exit-point
161 * @local: the address of the tunnel entry-point
164 * tunnel matching given end-points if found,
165 * else fallback tunnel if its device is up,
169 #define for_each_ip6_tunnel_rcu(start) \
170 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
172 static struct ip6_tnl *
173 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
175 unsigned int hash = HASH(remote, local);
177 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
179 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
180 if (ipv6_addr_equal(local, &t->parms.laddr) &&
181 ipv6_addr_equal(remote, &t->parms.raddr) &&
182 (t->dev->flags & IFF_UP))
185 t = rcu_dereference(ip6n->tnls_wc[0]);
186 if (t && (t->dev->flags & IFF_UP))
193 * ip6_tnl_bucket - get head of list matching given tunnel parameters
194 * @p: parameters containing tunnel end-points
197 * ip6_tnl_bucket() returns the head of the list matching the
198 * &struct in6_addr entries laddr and raddr in @p.
200 * Return: head of IPv6 tunnel list
203 static struct ip6_tnl __rcu **
204 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
206 const struct in6_addr *remote = &p->raddr;
207 const struct in6_addr *local = &p->laddr;
211 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
213 h = HASH(remote, local);
215 return &ip6n->tnls[prio][h];
219 * ip6_tnl_link - add tunnel to hash table
220 * @t: tunnel to be added
224 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
226 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
228 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
229 rcu_assign_pointer(*tp, t);
233 * ip6_tnl_unlink - remove tunnel from hash table
234 * @t: tunnel to be removed
238 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
240 struct ip6_tnl __rcu **tp;
241 struct ip6_tnl *iter;
243 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
244 (iter = rtnl_dereference(*tp)) != NULL;
247 rcu_assign_pointer(*tp, t->next);
253 static void ip6_dev_free(struct net_device *dev)
255 free_percpu(dev->tstats);
259 static int ip6_tnl_create2(struct net_device *dev)
261 struct ip6_tnl *t = netdev_priv(dev);
262 struct net *net = dev_net(dev);
263 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
266 t = netdev_priv(dev);
267 err = ip6_tnl_dev_init(dev);
271 err = register_netdevice(dev);
275 strcpy(t->parms.name, dev->name);
276 dev->rtnl_link_ops = &ip6_link_ops;
279 ip6_tnl_link(ip6n, t);
287 * ip6_tnl_create - create a new tunnel
288 * @p: tunnel parameters
289 * @pt: pointer to new tunnel
292 * Create tunnel matching given parameters.
295 * created tunnel or NULL
298 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
300 struct net_device *dev;
306 strlcpy(name, p->name, IFNAMSIZ);
308 sprintf(name, "ip6tnl%%d");
310 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
314 dev_net_set(dev, net);
316 t = netdev_priv(dev);
318 t->net = dev_net(dev);
319 err = ip6_tnl_create2(dev);
332 * ip6_tnl_locate - find or create tunnel matching given parameters
333 * @p: tunnel parameters
334 * @create: != 0 if allowed to create new tunnel if no match found
337 * ip6_tnl_locate() first tries to locate an existing tunnel
338 * based on @parms. If this is unsuccessful, but @create is set a new
339 * tunnel device is created and registered for use.
342 * matching tunnel or NULL
345 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
346 struct __ip6_tnl_parm *p, int create)
348 const struct in6_addr *remote = &p->raddr;
349 const struct in6_addr *local = &p->laddr;
350 struct ip6_tnl __rcu **tp;
352 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
354 for (tp = ip6_tnl_bucket(ip6n, p);
355 (t = rtnl_dereference(*tp)) != NULL;
357 if (ipv6_addr_equal(local, &t->parms.laddr) &&
358 ipv6_addr_equal(remote, &t->parms.raddr))
363 return ip6_tnl_create(net, p);
367 * ip6_tnl_dev_uninit - tunnel device uninitializer
368 * @dev: the device to be destroyed
371 * ip6_tnl_dev_uninit() removes tunnel from its list
375 ip6_tnl_dev_uninit(struct net_device *dev)
377 struct ip6_tnl *t = netdev_priv(dev);
378 struct net *net = t->net;
379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
381 if (dev == ip6n->fb_tnl_dev)
382 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
384 ip6_tnl_unlink(ip6n, t);
385 ip6_tnl_dst_reset(t);
390 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
391 * @skb: received socket buffer
394 * 0 if none was found,
395 * else index to encapsulation limit
398 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
400 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
401 __u8 nexthdr = ipv6h->nexthdr;
402 __u16 off = sizeof (*ipv6h);
404 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
406 struct ipv6_opt_hdr *hdr;
407 if (raw + off + sizeof (*hdr) > skb->data &&
408 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
411 hdr = (struct ipv6_opt_hdr *) (raw + off);
412 if (nexthdr == NEXTHDR_FRAGMENT) {
413 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
414 if (frag_hdr->frag_off)
417 } else if (nexthdr == NEXTHDR_AUTH) {
418 optlen = (hdr->hdrlen + 2) << 2;
420 optlen = ipv6_optlen(hdr);
422 if (nexthdr == NEXTHDR_DEST) {
425 struct ipv6_tlv_tnl_enc_lim *tel;
427 /* No more room for encapsulation limit */
428 if (i + sizeof (*tel) > off + optlen)
431 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
432 /* return index of option if found and valid */
433 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
436 /* else jump to next option */
438 i += tel->length + 2;
443 nexthdr = hdr->nexthdr;
448 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
451 * ip6_tnl_err - tunnel error handler
454 * ip6_tnl_err() should handle errors in the tunnel according
455 * to the specifications in RFC 2473.
459 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
460 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
462 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
465 u8 rel_type = ICMPV6_DEST_UNREACH;
466 u8 rel_code = ICMPV6_ADDR_UNREACH;
471 /* If the packet doesn't contain the original IPv6 header we are
472 in trouble since we might need the source address for further
473 processing of the error. */
476 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
477 &ipv6h->saddr)) == NULL)
480 if (t->parms.proto != ipproto && t->parms.proto != 0)
487 struct ipv6_tlv_tnl_enc_lim *tel;
489 case ICMPV6_DEST_UNREACH:
490 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
494 case ICMPV6_TIME_EXCEED:
495 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
496 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
501 case ICMPV6_PARAMPROB:
503 if ((*code) == ICMPV6_HDR_FIELD)
504 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
506 if (teli && teli == *info - 2) {
507 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
508 if (tel->encap_limit == 0) {
509 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
514 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
518 case ICMPV6_PKT_TOOBIG:
519 mtu = *info - offset;
520 if (mtu < IPV6_MIN_MTU)
524 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
525 rel_type = ICMPV6_PKT_TOOBIG;
544 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
545 u8 type, u8 code, int offset, __be32 info)
550 __u32 rel_info = ntohl(info);
552 struct sk_buff *skb2;
553 const struct iphdr *eiph;
557 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
558 &rel_msg, &rel_info, offset);
566 case ICMPV6_DEST_UNREACH:
567 if (rel_code != ICMPV6_ADDR_UNREACH)
569 rel_type = ICMP_DEST_UNREACH;
570 rel_code = ICMP_HOST_UNREACH;
572 case ICMPV6_PKT_TOOBIG:
575 rel_type = ICMP_DEST_UNREACH;
576 rel_code = ICMP_FRAG_NEEDED;
579 rel_type = ICMP_REDIRECT;
580 rel_code = ICMP_REDIR_HOST;
585 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
588 skb2 = skb_clone(skb, GFP_ATOMIC);
594 skb_pull(skb2, offset);
595 skb_reset_network_header(skb2);
598 /* Try to guess incoming interface */
599 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
602 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
606 skb2->dev = rt->dst.dev;
608 /* route "incoming" packet */
609 if (rt->rt_flags & RTCF_LOCAL) {
612 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
613 eiph->daddr, eiph->saddr,
616 RT_TOS(eiph->tos), 0);
618 rt->dst.dev->type != ARPHRD_TUNNEL) {
623 skb_dst_set(skb2, &rt->dst);
626 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
628 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
632 /* change mtu on this route */
633 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
634 if (rel_info > dst_mtu(skb_dst(skb2)))
637 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
639 if (rel_type == ICMP_REDIRECT)
640 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
642 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
650 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
651 u8 type, u8 code, int offset, __be32 info)
656 __u32 rel_info = ntohl(info);
659 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
660 &rel_msg, &rel_info, offset);
664 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
666 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
672 skb_pull(skb2, offset);
673 skb_reset_network_header(skb2);
675 /* Try to guess incoming interface */
676 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
679 if (rt && rt->dst.dev)
680 skb2->dev = rt->dst.dev;
682 icmpv6_send(skb2, rel_type, rel_code, rel_info);
692 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
693 const struct ipv6hdr *ipv6h,
696 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
698 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
699 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
701 return IP6_ECN_decapsulate(ipv6h, skb);
704 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
705 const struct ipv6hdr *ipv6h,
708 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
709 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
711 return IP6_ECN_decapsulate(ipv6h, skb);
714 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
715 const struct in6_addr *laddr,
716 const struct in6_addr *raddr)
718 struct __ip6_tnl_parm *p = &t->parms;
719 int ltype = ipv6_addr_type(laddr);
720 int rtype = ipv6_addr_type(raddr);
723 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
724 flags = IP6_TNL_F_CAP_PER_PACKET;
725 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
726 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
727 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
728 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
729 if (ltype&IPV6_ADDR_UNICAST)
730 flags |= IP6_TNL_F_CAP_XMIT;
731 if (rtype&IPV6_ADDR_UNICAST)
732 flags |= IP6_TNL_F_CAP_RCV;
736 EXPORT_SYMBOL(ip6_tnl_get_cap);
738 /* called with rcu_read_lock() */
739 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
740 const struct in6_addr *laddr,
741 const struct in6_addr *raddr)
743 struct __ip6_tnl_parm *p = &t->parms;
745 struct net *net = t->net;
747 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
748 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
749 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
750 struct net_device *ldev = NULL;
753 ldev = dev_get_by_index_rcu(net, p->link);
755 if ((ipv6_addr_is_multicast(laddr) ||
756 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
757 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
762 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
765 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
766 * @skb: received socket buffer
767 * @protocol: ethernet protocol ID
768 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
773 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
775 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
776 const struct ipv6hdr *ipv6h,
777 struct sk_buff *skb))
780 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
785 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
786 &ipv6h->daddr)) != NULL) {
787 struct pcpu_sw_netstats *tstats;
789 if (t->parms.proto != ipproto && t->parms.proto != 0) {
794 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
799 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
800 t->dev->stats.rx_dropped++;
804 skb->mac_header = skb->network_header;
805 skb_reset_network_header(skb);
806 skb->protocol = htons(protocol);
807 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
809 __skb_tunnel_rx(skb, t->dev, t->net);
811 err = dscp_ecn_decapsulate(t, ipv6h, skb);
814 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
816 ipv6_get_dsfield(ipv6h));
818 ++t->dev->stats.rx_frame_errors;
819 ++t->dev->stats.rx_errors;
825 tstats = this_cpu_ptr(t->dev->tstats);
826 tstats->rx_packets++;
827 tstats->rx_bytes += skb->len;
842 static int ip4ip6_rcv(struct sk_buff *skb)
844 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
845 ip4ip6_dscp_ecn_decapsulate);
848 static int ip6ip6_rcv(struct sk_buff *skb)
850 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
851 ip6ip6_dscp_ecn_decapsulate);
854 struct ipv6_tel_txoption {
855 struct ipv6_txoptions ops;
859 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
861 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
863 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
865 opt->dst_opt[4] = encap_limit;
866 opt->dst_opt[5] = IPV6_TLV_PADN;
869 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
870 opt->ops.opt_nflen = 8;
874 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
875 * @t: the outgoing tunnel device
876 * @hdr: IPv6 header from the incoming packet
879 * Avoid trivial tunneling loop by checking that tunnel exit-point
880 * doesn't match source of incoming packet.
888 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
890 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
893 int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
895 struct __ip6_tnl_parm *p = &t->parms;
897 struct net *net = t->net;
899 if (p->flags & IP6_TNL_F_CAP_XMIT) {
900 struct net_device *ldev = NULL;
904 ldev = dev_get_by_index_rcu(net, p->link);
906 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
907 pr_warn("%s xmit: Local address not yet configured!\n",
909 else if (!ipv6_addr_is_multicast(&p->raddr) &&
910 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
911 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
919 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
922 * ip6_tnl_xmit2 - encapsulate packet and send
923 * @skb: the outgoing socket buffer
924 * @dev: the outgoing tunnel device
925 * @dsfield: dscp code for outer header
926 * @fl: flow of tunneled packet
927 * @encap_limit: encapsulation limit
928 * @pmtu: Path MTU is stored if packet is too big
931 * Build new header and do some sanity checks on the packet before sending
937 * %-EMSGSIZE message too big. return mtu in this case.
940 static int ip6_tnl_xmit2(struct sk_buff *skb,
941 struct net_device *dev,
947 struct ip6_tnl *t = netdev_priv(dev);
948 struct net *net = t->net;
949 struct net_device_stats *stats = &t->dev->stats;
950 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
951 struct ipv6_tel_txoption opt;
952 struct dst_entry *dst = NULL, *ndst = NULL;
953 struct net_device *tdev;
955 unsigned int max_headroom = sizeof(struct ipv6hdr);
959 if (!fl6->flowi6_mark)
960 dst = ip6_tnl_dst_check(t);
962 ndst = ip6_route_output(net, NULL, fl6);
965 goto tx_err_link_failure;
966 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
970 goto tx_err_link_failure;
979 net_warn_ratelimited("%s: Local routing loop detected!\n",
981 goto tx_err_dst_release;
983 mtu = dst_mtu(dst) - sizeof (*ipv6h);
984 if (encap_limit >= 0) {
988 if (mtu < IPV6_MIN_MTU)
991 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
992 if (skb->len > mtu) {
995 goto tx_err_dst_release;
998 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1001 * Okay, now see if we can stuff it in the buffer as-is.
1003 max_headroom += LL_RESERVED_SPACE(tdev);
1005 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1006 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1007 struct sk_buff *new_skb;
1009 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1010 goto tx_err_dst_release;
1013 skb_set_owner_w(new_skb, skb->sk);
1017 if (fl6->flowi6_mark) {
1018 skb_dst_set(skb, dst);
1021 skb_dst_set_noref(skb, dst);
1023 skb->transport_header = skb->network_header;
1025 proto = fl6->flowi6_proto;
1026 if (encap_limit >= 0) {
1027 init_tel_txopt(&opt, encap_limit);
1028 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1031 if (likely(!skb->encapsulation)) {
1032 skb_reset_inner_headers(skb);
1033 skb->encapsulation = 1;
1036 skb_push(skb, sizeof(struct ipv6hdr));
1037 skb_reset_network_header(skb);
1038 ipv6h = ipv6_hdr(skb);
1039 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
1040 ipv6h->hop_limit = t->parms.hop_limit;
1041 ipv6h->nexthdr = proto;
1042 ipv6h->saddr = fl6->saddr;
1043 ipv6h->daddr = fl6->daddr;
1044 ip6tunnel_xmit(skb, dev);
1046 ip6_tnl_dst_store(t, ndst);
1048 tx_err_link_failure:
1049 stats->tx_carrier_errors++;
1050 dst_link_failure(skb);
1057 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1059 struct ip6_tnl *t = netdev_priv(dev);
1060 const struct iphdr *iph = ip_hdr(skb);
1061 int encap_limit = -1;
1067 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1068 !ip6_tnl_xmit_ctl(t))
1071 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1072 encap_limit = t->parms.encap_limit;
1074 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1075 fl6.flowi6_proto = IPPROTO_IPIP;
1077 dsfield = ipv4_get_dsfield(iph);
1079 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1080 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1082 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1083 fl6.flowi6_mark = skb->mark;
1085 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1087 /* XXX: send ICMP error even if DF is not set. */
1088 if (err == -EMSGSIZE)
1089 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1098 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1100 struct ip6_tnl *t = netdev_priv(dev);
1101 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1102 int encap_limit = -1;
1109 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1110 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1113 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1115 struct ipv6_tlv_tnl_enc_lim *tel;
1116 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1117 if (tel->encap_limit == 0) {
1118 icmpv6_send(skb, ICMPV6_PARAMPROB,
1119 ICMPV6_HDR_FIELD, offset + 2);
1122 encap_limit = tel->encap_limit - 1;
1123 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1124 encap_limit = t->parms.encap_limit;
1126 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1127 fl6.flowi6_proto = IPPROTO_IPV6;
1129 dsfield = ipv6_get_dsfield(ipv6h);
1130 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1131 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1132 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1133 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1134 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1135 fl6.flowi6_mark = skb->mark;
1137 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1139 if (err == -EMSGSIZE)
1140 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1148 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1150 struct ip6_tnl *t = netdev_priv(dev);
1151 struct net_device_stats *stats = &t->dev->stats;
1154 switch (skb->protocol) {
1155 case htons(ETH_P_IP):
1156 ret = ip4ip6_tnl_xmit(skb, dev);
1158 case htons(ETH_P_IPV6):
1159 ret = ip6ip6_tnl_xmit(skb, dev);
1168 return NETDEV_TX_OK;
1172 stats->tx_dropped++;
1174 return NETDEV_TX_OK;
1177 static void ip6_tnl_link_config(struct ip6_tnl *t)
1179 struct net_device *dev = t->dev;
1180 struct __ip6_tnl_parm *p = &t->parms;
1181 struct flowi6 *fl6 = &t->fl.u.ip6;
1183 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1184 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1186 /* Set up flowi template */
1187 fl6->saddr = p->laddr;
1188 fl6->daddr = p->raddr;
1189 fl6->flowi6_oif = p->link;
1192 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1193 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1194 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1195 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1197 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1198 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1200 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1201 dev->flags |= IFF_POINTOPOINT;
1203 dev->flags &= ~IFF_POINTOPOINT;
1205 dev->iflink = p->link;
1207 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1208 int strict = (ipv6_addr_type(&p->raddr) &
1209 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1211 struct rt6_info *rt = rt6_lookup(t->net,
1212 &p->raddr, &p->laddr,
1219 dev->hard_header_len = rt->dst.dev->hard_header_len +
1220 sizeof (struct ipv6hdr);
1222 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
1223 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1226 if (dev->mtu < IPV6_MIN_MTU)
1227 dev->mtu = IPV6_MIN_MTU;
1234 * ip6_tnl_change - update the tunnel parameters
1235 * @t: tunnel to be changed
1236 * @p: tunnel configuration parameters
1239 * ip6_tnl_change() updates the tunnel parameters
1243 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1245 t->parms.laddr = p->laddr;
1246 t->parms.raddr = p->raddr;
1247 t->parms.flags = p->flags;
1248 t->parms.hop_limit = p->hop_limit;
1249 t->parms.encap_limit = p->encap_limit;
1250 t->parms.flowinfo = p->flowinfo;
1251 t->parms.link = p->link;
1252 t->parms.proto = p->proto;
1253 ip6_tnl_dst_reset(t);
1254 ip6_tnl_link_config(t);
1258 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1260 struct net *net = t->net;
1261 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1264 ip6_tnl_unlink(ip6n, t);
1266 err = ip6_tnl_change(t, p);
1267 ip6_tnl_link(ip6n, t);
1268 netdev_state_change(t->dev);
1273 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1275 p->laddr = u->laddr;
1276 p->raddr = u->raddr;
1277 p->flags = u->flags;
1278 p->hop_limit = u->hop_limit;
1279 p->encap_limit = u->encap_limit;
1280 p->flowinfo = u->flowinfo;
1282 p->proto = u->proto;
1283 memcpy(p->name, u->name, sizeof(u->name));
1287 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1289 u->laddr = p->laddr;
1290 u->raddr = p->raddr;
1291 u->flags = p->flags;
1292 u->hop_limit = p->hop_limit;
1293 u->encap_limit = p->encap_limit;
1294 u->flowinfo = p->flowinfo;
1296 u->proto = p->proto;
1297 memcpy(u->name, p->name, sizeof(u->name));
1301 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1302 * @dev: virtual device associated with tunnel
1303 * @ifr: parameters passed from userspace
1304 * @cmd: command to be performed
1307 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1310 * The possible commands are the following:
1311 * %SIOCGETTUNNEL: get tunnel parameters for device
1312 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1313 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1314 * %SIOCDELTUNNEL: delete tunnel
1316 * The fallback device "ip6tnl0", created during module
1317 * initialization, can be used for creating other tunnel devices.
1321 * %-EFAULT if unable to copy data to or from userspace,
1322 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1323 * %-EINVAL if passed tunnel parameters are invalid,
1324 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1325 * %-ENODEV if attempting to change or delete a nonexisting device
1329 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1332 struct ip6_tnl_parm p;
1333 struct __ip6_tnl_parm p1;
1334 struct ip6_tnl *t = NULL;
1335 struct net *net = dev_net(dev);
1336 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1340 if (dev == ip6n->fb_tnl_dev) {
1341 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1345 ip6_tnl_parm_from_user(&p1, &p);
1346 t = ip6_tnl_locate(net, &p1, 0);
1348 memset(&p, 0, sizeof(p));
1351 t = netdev_priv(dev);
1352 ip6_tnl_parm_to_user(&p, &t->parms);
1353 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1360 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1363 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1366 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1369 ip6_tnl_parm_from_user(&p1, &p);
1370 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1371 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1373 if (t->dev != dev) {
1378 t = netdev_priv(dev);
1380 err = ip6_tnl_update(t, &p1);
1384 ip6_tnl_parm_to_user(&p, &t->parms);
1385 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1389 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1393 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1396 if (dev == ip6n->fb_tnl_dev) {
1398 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1401 ip6_tnl_parm_from_user(&p1, &p);
1402 t = ip6_tnl_locate(net, &p1, 0);
1406 if (t->dev == ip6n->fb_tnl_dev)
1411 unregister_netdevice(dev);
1420 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1421 * @dev: virtual device associated with tunnel
1422 * @new_mtu: the new mtu
1426 * %-EINVAL if mtu too small
1430 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1432 struct ip6_tnl *tnl = netdev_priv(dev);
1434 if (tnl->parms.proto == IPPROTO_IPIP) {
1438 if (new_mtu < IPV6_MIN_MTU)
1441 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1448 static const struct net_device_ops ip6_tnl_netdev_ops = {
1449 .ndo_uninit = ip6_tnl_dev_uninit,
1450 .ndo_start_xmit = ip6_tnl_xmit,
1451 .ndo_do_ioctl = ip6_tnl_ioctl,
1452 .ndo_change_mtu = ip6_tnl_change_mtu,
1453 .ndo_get_stats = ip6_get_stats,
1458 * ip6_tnl_dev_setup - setup virtual tunnel device
1459 * @dev: virtual device associated with tunnel
1462 * Initialize function pointers and device parameters
1465 static void ip6_tnl_dev_setup(struct net_device *dev)
1469 dev->netdev_ops = &ip6_tnl_netdev_ops;
1470 dev->destructor = ip6_dev_free;
1472 dev->type = ARPHRD_TUNNEL6;
1473 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1474 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1475 t = netdev_priv(dev);
1476 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1478 dev->flags |= IFF_NOARP;
1479 dev->addr_len = sizeof(struct in6_addr);
1480 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1481 /* This perm addr will be used as interface identifier by IPv6 */
1482 dev->addr_assign_type = NET_ADDR_RANDOM;
1483 eth_random_addr(dev->perm_addr);
1488 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1489 * @dev: virtual device associated with tunnel
1493 ip6_tnl_dev_init_gen(struct net_device *dev)
1495 struct ip6_tnl *t = netdev_priv(dev);
1499 t->net = dev_net(dev);
1500 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1504 for_each_possible_cpu(i) {
1505 struct pcpu_sw_netstats *ip6_tnl_stats;
1506 ip6_tnl_stats = per_cpu_ptr(dev->tstats, i);
1507 u64_stats_init(&ip6_tnl_stats->syncp);
1513 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1514 * @dev: virtual device associated with tunnel
1517 static int ip6_tnl_dev_init(struct net_device *dev)
1519 struct ip6_tnl *t = netdev_priv(dev);
1520 int err = ip6_tnl_dev_init_gen(dev);
1524 ip6_tnl_link_config(t);
1529 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1530 * @dev: fallback device
1535 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1537 struct ip6_tnl *t = netdev_priv(dev);
1538 struct net *net = dev_net(dev);
1539 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1540 int err = ip6_tnl_dev_init_gen(dev);
1545 t->parms.proto = IPPROTO_IPV6;
1548 ip6_tnl_link_config(t);
1550 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1554 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1561 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1562 if (proto != IPPROTO_IPV6 &&
1563 proto != IPPROTO_IPIP &&
1570 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1571 struct __ip6_tnl_parm *parms)
1573 memset(parms, 0, sizeof(*parms));
1578 if (data[IFLA_IPTUN_LINK])
1579 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1581 if (data[IFLA_IPTUN_LOCAL])
1582 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1583 sizeof(struct in6_addr));
1585 if (data[IFLA_IPTUN_REMOTE])
1586 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1587 sizeof(struct in6_addr));
1589 if (data[IFLA_IPTUN_TTL])
1590 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1592 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1593 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1595 if (data[IFLA_IPTUN_FLOWINFO])
1596 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1598 if (data[IFLA_IPTUN_FLAGS])
1599 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1601 if (data[IFLA_IPTUN_PROTO])
1602 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1605 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1606 struct nlattr *tb[], struct nlattr *data[])
1608 struct net *net = dev_net(dev);
1611 nt = netdev_priv(dev);
1612 ip6_tnl_netlink_parms(data, &nt->parms);
1614 if (ip6_tnl_locate(net, &nt->parms, 0))
1617 return ip6_tnl_create2(dev);
1620 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1621 struct nlattr *data[])
1623 struct ip6_tnl *t = netdev_priv(dev);
1624 struct __ip6_tnl_parm p;
1625 struct net *net = t->net;
1626 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1628 if (dev == ip6n->fb_tnl_dev)
1631 ip6_tnl_netlink_parms(data, &p);
1633 t = ip6_tnl_locate(net, &p, 0);
1639 t = netdev_priv(dev);
1641 return ip6_tnl_update(t, &p);
1644 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1646 struct net *net = dev_net(dev);
1647 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1649 if (dev != ip6n->fb_tnl_dev)
1650 unregister_netdevice_queue(dev, head);
1653 static size_t ip6_tnl_get_size(const struct net_device *dev)
1656 /* IFLA_IPTUN_LINK */
1658 /* IFLA_IPTUN_LOCAL */
1659 nla_total_size(sizeof(struct in6_addr)) +
1660 /* IFLA_IPTUN_REMOTE */
1661 nla_total_size(sizeof(struct in6_addr)) +
1662 /* IFLA_IPTUN_TTL */
1664 /* IFLA_IPTUN_ENCAP_LIMIT */
1666 /* IFLA_IPTUN_FLOWINFO */
1668 /* IFLA_IPTUN_FLAGS */
1670 /* IFLA_IPTUN_PROTO */
1675 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1677 struct ip6_tnl *tunnel = netdev_priv(dev);
1678 struct __ip6_tnl_parm *parm = &tunnel->parms;
1680 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1681 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1683 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1685 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1686 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1687 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1688 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1689 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1690 goto nla_put_failure;
1697 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1698 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1699 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1700 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1701 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1702 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1703 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1704 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1705 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1708 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1710 .maxtype = IFLA_IPTUN_MAX,
1711 .policy = ip6_tnl_policy,
1712 .priv_size = sizeof(struct ip6_tnl),
1713 .setup = ip6_tnl_dev_setup,
1714 .validate = ip6_tnl_validate,
1715 .newlink = ip6_tnl_newlink,
1716 .changelink = ip6_tnl_changelink,
1717 .dellink = ip6_tnl_dellink,
1718 .get_size = ip6_tnl_get_size,
1719 .fill_info = ip6_tnl_fill_info,
1722 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1723 .handler = ip4ip6_rcv,
1724 .err_handler = ip4ip6_err,
1728 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1729 .handler = ip6ip6_rcv,
1730 .err_handler = ip6ip6_err,
1734 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1736 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1737 struct net_device *dev, *aux;
1742 for_each_netdev_safe(net, dev, aux)
1743 if (dev->rtnl_link_ops == &ip6_link_ops)
1744 unregister_netdevice_queue(dev, &list);
1746 for (h = 0; h < HASH_SIZE; h++) {
1747 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1749 /* If dev is in the same netns, it has already
1750 * been added to the list by the previous loop.
1752 if (!net_eq(dev_net(t->dev), net))
1753 unregister_netdevice_queue(t->dev, &list);
1754 t = rtnl_dereference(t->next);
1758 unregister_netdevice_many(&list);
1761 static int __net_init ip6_tnl_init_net(struct net *net)
1763 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1764 struct ip6_tnl *t = NULL;
1767 ip6n->tnls[0] = ip6n->tnls_wc;
1768 ip6n->tnls[1] = ip6n->tnls_r_l;
1771 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1774 if (!ip6n->fb_tnl_dev)
1776 dev_net_set(ip6n->fb_tnl_dev, net);
1777 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1778 /* FB netdevice is special: we have one, and only one per netns.
1779 * Allowing to move it to another netns is clearly unsafe.
1781 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1783 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1787 err = register_netdev(ip6n->fb_tnl_dev);
1791 t = netdev_priv(ip6n->fb_tnl_dev);
1793 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1797 ip6_dev_free(ip6n->fb_tnl_dev);
1802 static void __net_exit ip6_tnl_exit_net(struct net *net)
1805 ip6_tnl_destroy_tunnels(net);
1809 static struct pernet_operations ip6_tnl_net_ops = {
1810 .init = ip6_tnl_init_net,
1811 .exit = ip6_tnl_exit_net,
1812 .id = &ip6_tnl_net_id,
1813 .size = sizeof(struct ip6_tnl_net),
1817 * ip6_tunnel_init - register protocol and reserve needed resources
1819 * Return: 0 on success
1822 static int __init ip6_tunnel_init(void)
1826 err = register_pernet_device(&ip6_tnl_net_ops);
1830 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1832 pr_err("%s: can't register ip4ip6\n", __func__);
1836 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1838 pr_err("%s: can't register ip6ip6\n", __func__);
1841 err = rtnl_link_register(&ip6_link_ops);
1843 goto rtnl_link_failed;
1848 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1850 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1852 unregister_pernet_device(&ip6_tnl_net_ops);
1858 * ip6_tunnel_cleanup - free resources and unregister protocol
1861 static void __exit ip6_tunnel_cleanup(void)
1863 rtnl_link_unregister(&ip6_link_ops);
1864 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1865 pr_info("%s: can't deregister ip4ip6\n", __func__);
1867 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1868 pr_info("%s: can't deregister ip6ip6\n", __func__);
1870 unregister_pernet_device(&ip6_tnl_net_ops);
1873 module_init(ip6_tunnel_init);
1874 module_exit(ip6_tunnel_cleanup);