2 * GRE over IPv6 protocol decoder.
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/mroute.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
35 #include <linux/hash.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
41 #include <net/ip_tunnels.h>
43 #include <net/protocol.h>
44 #include <net/addrconf.h>
46 #include <net/checksum.h>
47 #include <net/dsfield.h>
48 #include <net/inet_ecn.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
52 #include <net/rtnetlink.h>
55 #include <net/ip6_fib.h>
56 #include <net/ip6_route.h>
57 #include <net/ip6_tunnel.h>
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
64 #define HASH_SIZE_SHIFT 5
65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
67 static int ip6gre_net_id __read_mostly;
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
71 struct net_device *fb_tunnel_dev;
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static int ip6gre_tunnel_init(struct net_device *dev);
76 static void ip6gre_tunnel_setup(struct net_device *dev);
77 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
78 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80 /* Tunnel hash table */
90 We require exact key match i.e. if a key is present in packet
91 it will match only tunnel with the same key; if it is not present,
92 it will match only keyless tunnel.
94 All keysless packets, if not matched configured keyless tunnels
95 will match fallback tunnel.
98 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
99 static u32 HASH_ADDR(const struct in6_addr *addr)
101 u32 hash = ipv6_addr_hash(addr);
103 return hash_32(hash, HASH_SIZE_SHIFT);
106 #define tunnels_r_l tunnels[3]
107 #define tunnels_r tunnels[2]
108 #define tunnels_l tunnels[1]
109 #define tunnels_wc tunnels[0]
111 /* Given src, dst and key, find appropriate for input tunnel. */
113 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
114 const struct in6_addr *remote, const struct in6_addr *local,
115 __be32 key, __be16 gre_proto)
117 struct net *net = dev_net(dev);
118 int link = dev->ifindex;
119 unsigned int h0 = HASH_ADDR(remote);
120 unsigned int h1 = HASH_KEY(key);
121 struct ip6_tnl *t, *cand = NULL;
122 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
123 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
124 ARPHRD_ETHER : ARPHRD_IP6GRE;
125 int score, cand_score = 4;
127 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
128 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
129 !ipv6_addr_equal(remote, &t->parms.raddr) ||
130 key != t->parms.i_key ||
131 !(t->dev->flags & IFF_UP))
134 if (t->dev->type != ARPHRD_IP6GRE &&
135 t->dev->type != dev_type)
139 if (t->parms.link != link)
141 if (t->dev->type != dev_type)
146 if (score < cand_score) {
152 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
153 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
154 key != t->parms.i_key ||
155 !(t->dev->flags & IFF_UP))
158 if (t->dev->type != ARPHRD_IP6GRE &&
159 t->dev->type != dev_type)
163 if (t->parms.link != link)
165 if (t->dev->type != dev_type)
170 if (score < cand_score) {
176 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
177 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
178 (!ipv6_addr_equal(local, &t->parms.raddr) ||
179 !ipv6_addr_is_multicast(local))) ||
180 key != t->parms.i_key ||
181 !(t->dev->flags & IFF_UP))
184 if (t->dev->type != ARPHRD_IP6GRE &&
185 t->dev->type != dev_type)
189 if (t->parms.link != link)
191 if (t->dev->type != dev_type)
196 if (score < cand_score) {
202 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
203 if (t->parms.i_key != key ||
204 !(t->dev->flags & IFF_UP))
207 if (t->dev->type != ARPHRD_IP6GRE &&
208 t->dev->type != dev_type)
212 if (t->parms.link != link)
214 if (t->dev->type != dev_type)
219 if (score < cand_score) {
228 dev = ign->fb_tunnel_dev;
229 if (dev->flags & IFF_UP)
230 return netdev_priv(dev);
235 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
236 const struct __ip6_tnl_parm *p)
238 const struct in6_addr *remote = &p->raddr;
239 const struct in6_addr *local = &p->laddr;
240 unsigned int h = HASH_KEY(p->i_key);
243 if (!ipv6_addr_any(local))
245 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 h ^= HASH_ADDR(remote);
250 return &ign->tunnels[prio][h];
253 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
254 const struct ip6_tnl *t)
256 return __ip6gre_bucket(ign, &t->parms);
259 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
264 rcu_assign_pointer(*tp, t);
267 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269 struct ip6_tnl __rcu **tp;
270 struct ip6_tnl *iter;
272 for (tp = ip6gre_bucket(ign, t);
273 (iter = rtnl_dereference(*tp)) != NULL;
276 rcu_assign_pointer(*tp, t->next);
282 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
283 const struct __ip6_tnl_parm *parms,
286 const struct in6_addr *remote = &parms->raddr;
287 const struct in6_addr *local = &parms->laddr;
288 __be32 key = parms->i_key;
289 int link = parms->link;
291 struct ip6_tnl __rcu **tp;
292 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294 for (tp = __ip6gre_bucket(ign, parms);
295 (t = rtnl_dereference(*tp)) != NULL;
297 if (ipv6_addr_equal(local, &t->parms.laddr) &&
298 ipv6_addr_equal(remote, &t->parms.raddr) &&
299 key == t->parms.i_key &&
300 link == t->parms.link &&
301 type == t->dev->type)
307 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
308 const struct __ip6_tnl_parm *parms, int create)
310 struct ip6_tnl *t, *nt;
311 struct net_device *dev;
313 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
320 strlcpy(name, parms->name, IFNAMSIZ);
322 strcpy(name, "ip6gre%d");
324 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
328 dev_net_set(dev, net);
330 nt = netdev_priv(dev);
332 dev->rtnl_link_ops = &ip6gre_link_ops;
335 nt->net = dev_net(dev);
336 ip6gre_tnl_link_config(nt, 1);
338 if (register_netdevice(dev) < 0)
341 /* Can use a lockless transmit, unless we generate output sequences */
342 if (!(nt->parms.o_flags & GRE_SEQ))
343 dev->features |= NETIF_F_LLTX;
346 ip6gre_tunnel_link(ign, nt);
354 static void ip6gre_tunnel_uninit(struct net_device *dev)
356 struct net *net = dev_net(dev);
357 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
359 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
364 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
365 u8 type, u8 code, int offset, __be32 info)
367 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
368 __be16 *p = (__be16 *)(skb->data + offset);
369 int grehlen = offset + 4;
374 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
375 if (flags&(GRE_VERSION|GRE_ROUTING))
384 /* If only 8 bytes returned, keyed message will be dropped here */
385 if (!pskb_may_pull(skb, grehlen))
387 ipv6h = (const struct ipv6hdr *)skb->data;
388 p = (__be16 *)(skb->data + offset);
390 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
392 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
399 struct ipv6_tlv_tnl_enc_lim *tel;
401 case ICMPV6_DEST_UNREACH:
402 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
405 case ICMPV6_TIME_EXCEED:
406 if (code == ICMPV6_EXC_HOPLIMIT) {
407 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
411 case ICMPV6_PARAMPROB:
413 if (code == ICMPV6_HDR_FIELD)
414 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
416 if (teli && teli == info - 2) {
417 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
418 if (tel->encap_limit == 0) {
419 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
423 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
427 case ICMPV6_PKT_TOOBIG:
429 if (mtu < IPV6_MIN_MTU)
435 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
439 t->err_time = jiffies;
442 static int ip6gre_rcv(struct sk_buff *skb)
444 const struct ipv6hdr *ipv6h;
450 struct ip6_tnl *tunnel;
455 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
458 ipv6h = ipv6_hdr(skb);
460 flags = *(__be16 *)h;
462 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
463 /* - Version must be 0.
464 - We do not support routing headers.
466 if (flags&(GRE_VERSION|GRE_ROUTING))
469 if (flags&GRE_CSUM) {
470 switch (skb->ip_summed) {
471 case CHECKSUM_COMPLETE:
472 csum = csum_fold(skb->csum);
478 csum = __skb_checksum_complete(skb);
479 skb->ip_summed = CHECKSUM_COMPLETE;
484 key = *(__be32 *)(h + offset);
488 seqno = ntohl(*(__be32 *)(h + offset));
493 gre_proto = *(__be16 *)(h + 2);
495 tunnel = ip6gre_tunnel_lookup(skb->dev,
496 &ipv6h->saddr, &ipv6h->daddr, key,
499 struct pcpu_sw_netstats *tstats;
501 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
504 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
505 tunnel->dev->stats.rx_dropped++;
509 skb->protocol = gre_proto;
510 /* WCCP version 1 and 2 protocol decoding.
511 * - Change protocol to IP
512 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
514 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
515 skb->protocol = htons(ETH_P_IP);
516 if ((*(h + offset) & 0xF0) != 0x40)
520 skb->mac_header = skb->network_header;
521 __pskb_pull(skb, offset);
522 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
524 if (((flags&GRE_CSUM) && csum) ||
525 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
526 tunnel->dev->stats.rx_crc_errors++;
527 tunnel->dev->stats.rx_errors++;
530 if (tunnel->parms.i_flags&GRE_SEQ) {
531 if (!(flags&GRE_SEQ) ||
533 (s32)(seqno - tunnel->i_seqno) < 0)) {
534 tunnel->dev->stats.rx_fifo_errors++;
535 tunnel->dev->stats.rx_errors++;
538 tunnel->i_seqno = seqno + 1;
541 /* Warning: All skb pointers will be invalidated! */
542 if (tunnel->dev->type == ARPHRD_ETHER) {
543 if (!pskb_may_pull(skb, ETH_HLEN)) {
544 tunnel->dev->stats.rx_length_errors++;
545 tunnel->dev->stats.rx_errors++;
549 ipv6h = ipv6_hdr(skb);
550 skb->protocol = eth_type_trans(skb, tunnel->dev);
551 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
554 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
556 skb_reset_network_header(skb);
558 err = IP6_ECN_decapsulate(ipv6h, skb);
561 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
563 ipv6_get_dsfield(ipv6h));
565 ++tunnel->dev->stats.rx_frame_errors;
566 ++tunnel->dev->stats.rx_errors;
571 tstats = this_cpu_ptr(tunnel->dev->tstats);
572 u64_stats_update_begin(&tstats->syncp);
573 tstats->rx_packets++;
574 tstats->rx_bytes += skb->len;
575 u64_stats_update_end(&tstats->syncp);
581 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
588 struct ipv6_tel_txoption {
589 struct ipv6_txoptions ops;
593 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
595 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
597 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
599 opt->dst_opt[4] = encap_limit;
600 opt->dst_opt[5] = IPV6_TLV_PADN;
603 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
604 opt->ops.opt_nflen = 8;
607 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
608 struct net_device *dev,
614 struct net *net = dev_net(dev);
615 struct ip6_tnl *tunnel = netdev_priv(dev);
616 struct net_device *tdev; /* Device to other host */
617 struct ipv6hdr *ipv6h; /* Our new IP header */
618 unsigned int max_headroom = 0; /* The extra header space needed */
620 struct ipv6_tel_txoption opt;
622 struct dst_entry *dst = NULL, *ndst = NULL;
623 struct net_device_stats *stats = &tunnel->dev->stats;
626 struct sk_buff *new_skb;
628 if (dev->type == ARPHRD_ETHER)
629 IPCB(skb)->flags = 0;
631 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
633 ipv6h = (struct ipv6hdr *)skb->data;
634 fl6->daddr = ipv6h->daddr;
636 gre_hlen = tunnel->hlen;
637 fl6->daddr = tunnel->parms.raddr;
640 if (!fl6->flowi6_mark)
641 dst = ip6_tnl_dst_check(tunnel);
644 ndst = ip6_route_output(net, NULL, fl6);
647 goto tx_err_link_failure;
648 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
652 goto tx_err_link_failure;
661 net_warn_ratelimited("%s: Local routing loop detected!\n",
663 goto tx_err_dst_release;
666 mtu = dst_mtu(dst) - sizeof(*ipv6h);
667 if (encap_limit >= 0) {
671 if (mtu < IPV6_MIN_MTU)
674 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
675 if (skb->len > mtu) {
678 goto tx_err_dst_release;
681 if (tunnel->err_count > 0) {
682 if (time_before(jiffies,
683 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
686 dst_link_failure(skb);
688 tunnel->err_count = 0;
691 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
693 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
695 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
696 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
697 new_skb = skb_realloc_headroom(skb, max_headroom);
698 if (max_headroom > dev->needed_headroom)
699 dev->needed_headroom = max_headroom;
701 goto tx_err_dst_release;
704 skb_set_owner_w(new_skb, skb->sk);
709 if (fl6->flowi6_mark) {
710 skb_dst_set(skb, dst);
713 skb_dst_set_noref(skb, dst);
717 if (encap_limit >= 0) {
718 init_tel_txopt(&opt, encap_limit);
719 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
722 if (likely(!skb->encapsulation)) {
723 skb_reset_inner_headers(skb);
724 skb->encapsulation = 1;
727 skb_push(skb, gre_hlen);
728 skb_reset_network_header(skb);
729 skb_set_transport_header(skb, sizeof(*ipv6h));
732 * Push down and install the IP header.
734 ipv6h = ipv6_hdr(skb);
735 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
736 ipv6h->hop_limit = tunnel->parms.hop_limit;
737 ipv6h->nexthdr = proto;
738 ipv6h->saddr = fl6->saddr;
739 ipv6h->daddr = fl6->daddr;
741 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
742 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
743 htons(ETH_P_TEB) : skb->protocol;
745 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
746 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
748 if (tunnel->parms.o_flags&GRE_SEQ) {
750 *ptr = htonl(tunnel->o_seqno);
753 if (tunnel->parms.o_flags&GRE_KEY) {
754 *ptr = tunnel->parms.o_key;
757 if (tunnel->parms.o_flags&GRE_CSUM) {
759 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
760 skb->len - sizeof(struct ipv6hdr));
764 ip6tunnel_xmit(skb, dev);
766 ip6_tnl_dst_store(tunnel, ndst);
769 stats->tx_carrier_errors++;
770 dst_link_failure(skb);
776 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
778 struct ip6_tnl *t = netdev_priv(dev);
779 const struct iphdr *iph = ip_hdr(skb);
780 int encap_limit = -1;
786 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
787 encap_limit = t->parms.encap_limit;
789 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
790 fl6.flowi6_proto = IPPROTO_IPIP;
792 dsfield = ipv4_get_dsfield(iph);
794 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
795 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
797 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
798 fl6.flowi6_mark = skb->mark;
800 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
802 /* XXX: send ICMP error even if DF is not set. */
803 if (err == -EMSGSIZE)
804 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
812 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
814 struct ip6_tnl *t = netdev_priv(dev);
815 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
816 int encap_limit = -1;
823 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
826 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
828 struct ipv6_tlv_tnl_enc_lim *tel;
829 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
830 if (tel->encap_limit == 0) {
831 icmpv6_send(skb, ICMPV6_PARAMPROB,
832 ICMPV6_HDR_FIELD, offset + 2);
835 encap_limit = tel->encap_limit - 1;
836 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
837 encap_limit = t->parms.encap_limit;
839 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
840 fl6.flowi6_proto = IPPROTO_IPV6;
842 dsfield = ipv6_get_dsfield(ipv6h);
843 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
844 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
845 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
846 fl6.flowlabel |= ip6_flowlabel(ipv6h);
847 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
848 fl6.flowi6_mark = skb->mark;
850 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
852 if (err == -EMSGSIZE)
853 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
861 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
862 * @t: the outgoing tunnel device
863 * @hdr: IPv6 header from the incoming packet
866 * Avoid trivial tunneling loop by checking that tunnel exit-point
867 * doesn't match source of incoming packet.
874 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
875 const struct ipv6hdr *hdr)
877 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
880 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
882 struct ip6_tnl *t = netdev_priv(dev);
883 int encap_limit = -1;
888 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
889 encap_limit = t->parms.encap_limit;
891 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
892 fl6.flowi6_proto = skb->protocol;
894 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
899 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
900 struct net_device *dev)
902 struct ip6_tnl *t = netdev_priv(dev);
903 struct net_device_stats *stats = &t->dev->stats;
906 if (!ip6_tnl_xmit_ctl(t))
909 switch (skb->protocol) {
910 case htons(ETH_P_IP):
911 ret = ip6gre_xmit_ipv4(skb, dev);
913 case htons(ETH_P_IPV6):
914 ret = ip6gre_xmit_ipv6(skb, dev);
917 ret = ip6gre_xmit_other(skb, dev);
933 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
935 struct net_device *dev = t->dev;
936 struct __ip6_tnl_parm *p = &t->parms;
937 struct flowi6 *fl6 = &t->fl.u.ip6;
938 int addend = sizeof(struct ipv6hdr) + 4;
940 if (dev->type != ARPHRD_ETHER) {
941 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
942 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
945 /* Set up flowi template */
946 fl6->saddr = p->laddr;
947 fl6->daddr = p->raddr;
948 fl6->flowi6_oif = p->link;
951 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
952 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
953 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
954 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
956 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
957 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
959 if (p->flags&IP6_TNL_F_CAP_XMIT &&
960 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
961 dev->flags |= IFF_POINTOPOINT;
963 dev->flags &= ~IFF_POINTOPOINT;
965 dev->iflink = p->link;
967 /* Precalculate GRE options length */
968 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
969 if (t->parms.o_flags&GRE_CSUM)
971 if (t->parms.o_flags&GRE_KEY)
973 if (t->parms.o_flags&GRE_SEQ)
978 if (p->flags & IP6_TNL_F_CAP_XMIT) {
979 int strict = (ipv6_addr_type(&p->raddr) &
980 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
982 struct rt6_info *rt = rt6_lookup(dev_net(dev),
983 &p->raddr, &p->laddr,
990 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
993 dev->mtu = rt->dst.dev->mtu - addend;
994 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
997 if (dev->mtu < IPV6_MIN_MTU)
998 dev->mtu = IPV6_MIN_MTU;
1005 static int ip6gre_tnl_change(struct ip6_tnl *t,
1006 const struct __ip6_tnl_parm *p, int set_mtu)
1008 t->parms.laddr = p->laddr;
1009 t->parms.raddr = p->raddr;
1010 t->parms.flags = p->flags;
1011 t->parms.hop_limit = p->hop_limit;
1012 t->parms.encap_limit = p->encap_limit;
1013 t->parms.flowinfo = p->flowinfo;
1014 t->parms.link = p->link;
1015 t->parms.proto = p->proto;
1016 t->parms.i_key = p->i_key;
1017 t->parms.o_key = p->o_key;
1018 t->parms.i_flags = p->i_flags;
1019 t->parms.o_flags = p->o_flags;
1020 ip6_tnl_dst_reset(t);
1021 ip6gre_tnl_link_config(t, set_mtu);
1025 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1026 const struct ip6_tnl_parm2 *u)
1028 p->laddr = u->laddr;
1029 p->raddr = u->raddr;
1030 p->flags = u->flags;
1031 p->hop_limit = u->hop_limit;
1032 p->encap_limit = u->encap_limit;
1033 p->flowinfo = u->flowinfo;
1035 p->i_key = u->i_key;
1036 p->o_key = u->o_key;
1037 p->i_flags = u->i_flags;
1038 p->o_flags = u->o_flags;
1039 memcpy(p->name, u->name, sizeof(u->name));
1042 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1043 const struct __ip6_tnl_parm *p)
1045 u->proto = IPPROTO_GRE;
1046 u->laddr = p->laddr;
1047 u->raddr = p->raddr;
1048 u->flags = p->flags;
1049 u->hop_limit = p->hop_limit;
1050 u->encap_limit = p->encap_limit;
1051 u->flowinfo = p->flowinfo;
1053 u->i_key = p->i_key;
1054 u->o_key = p->o_key;
1055 u->i_flags = p->i_flags;
1056 u->o_flags = p->o_flags;
1057 memcpy(u->name, p->name, sizeof(u->name));
1060 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1061 struct ifreq *ifr, int cmd)
1064 struct ip6_tnl_parm2 p;
1065 struct __ip6_tnl_parm p1;
1067 struct net *net = dev_net(dev);
1068 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1073 if (dev == ign->fb_tunnel_dev) {
1074 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1078 ip6gre_tnl_parm_from_user(&p1, &p);
1079 t = ip6gre_tunnel_locate(net, &p1, 0);
1082 t = netdev_priv(dev);
1083 memset(&p, 0, sizeof(p));
1084 ip6gre_tnl_parm_to_user(&p, &t->parms);
1085 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1092 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1096 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1100 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1103 if (!(p.i_flags&GRE_KEY))
1105 if (!(p.o_flags&GRE_KEY))
1108 ip6gre_tnl_parm_from_user(&p1, &p);
1109 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1111 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1113 if (t->dev != dev) {
1118 t = netdev_priv(dev);
1120 ip6gre_tunnel_unlink(ign, t);
1122 ip6gre_tnl_change(t, &p1, 1);
1123 ip6gre_tunnel_link(ign, t);
1124 netdev_state_change(dev);
1131 memset(&p, 0, sizeof(p));
1132 ip6gre_tnl_parm_to_user(&p, &t->parms);
1133 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1136 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1141 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1144 if (dev == ign->fb_tunnel_dev) {
1146 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1149 ip6gre_tnl_parm_from_user(&p1, &p);
1150 t = ip6gre_tunnel_locate(net, &p1, 0);
1154 if (t == netdev_priv(ign->fb_tunnel_dev))
1158 unregister_netdevice(dev);
1170 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1173 new_mtu > 0xFFF8 - dev->hard_header_len)
1179 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1180 unsigned short type,
1181 const void *daddr, const void *saddr, unsigned int len)
1183 struct ip6_tnl *t = netdev_priv(dev);
1184 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1185 __be16 *p = (__be16 *)(ipv6h+1);
1187 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1188 ipv6h->hop_limit = t->parms.hop_limit;
1189 ipv6h->nexthdr = NEXTHDR_GRE;
1190 ipv6h->saddr = t->parms.laddr;
1191 ipv6h->daddr = t->parms.raddr;
1193 p[0] = t->parms.o_flags;
1197 * Set the source hardware address.
1201 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1203 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1204 if (!ipv6_addr_any(&ipv6h->daddr))
1210 static const struct header_ops ip6gre_header_ops = {
1211 .create = ip6gre_header,
1214 static const struct net_device_ops ip6gre_netdev_ops = {
1215 .ndo_init = ip6gre_tunnel_init,
1216 .ndo_uninit = ip6gre_tunnel_uninit,
1217 .ndo_start_xmit = ip6gre_tunnel_xmit,
1218 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1219 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1220 .ndo_get_stats64 = ip_tunnel_get_stats64,
1223 static void ip6gre_dev_free(struct net_device *dev)
1225 free_percpu(dev->tstats);
1229 static void ip6gre_tunnel_setup(struct net_device *dev)
1233 dev->netdev_ops = &ip6gre_netdev_ops;
1234 dev->destructor = ip6gre_dev_free;
1236 dev->type = ARPHRD_IP6GRE;
1237 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1238 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1239 t = netdev_priv(dev);
1240 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1242 dev->flags |= IFF_NOARP;
1244 dev->addr_len = sizeof(struct in6_addr);
1245 dev->features |= NETIF_F_NETNS_LOCAL;
1246 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1249 static int ip6gre_tunnel_init(struct net_device *dev)
1251 struct ip6_tnl *tunnel;
1254 tunnel = netdev_priv(dev);
1257 tunnel->net = dev_net(dev);
1258 strcpy(tunnel->parms.name, dev->name);
1260 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1261 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1263 if (ipv6_addr_any(&tunnel->parms.raddr))
1264 dev->header_ops = &ip6gre_header_ops;
1266 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1270 for_each_possible_cpu(i) {
1271 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
1272 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1273 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1280 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1282 struct ip6_tnl *tunnel = netdev_priv(dev);
1285 tunnel->net = dev_net(dev);
1286 strcpy(tunnel->parms.name, dev->name);
1288 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1294 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1295 .handler = ip6gre_rcv,
1296 .err_handler = ip6gre_err,
1297 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1300 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1301 struct list_head *head)
1305 for (prio = 0; prio < 4; prio++) {
1307 for (h = 0; h < HASH_SIZE; h++) {
1310 t = rtnl_dereference(ign->tunnels[prio][h]);
1313 unregister_netdevice_queue(t->dev, head);
1314 t = rtnl_dereference(t->next);
1320 static int __net_init ip6gre_init_net(struct net *net)
1322 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1325 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1326 ip6gre_tunnel_setup);
1327 if (!ign->fb_tunnel_dev) {
1331 dev_net_set(ign->fb_tunnel_dev, net);
1333 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1334 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1336 err = register_netdev(ign->fb_tunnel_dev);
1340 rcu_assign_pointer(ign->tunnels_wc[0],
1341 netdev_priv(ign->fb_tunnel_dev));
1345 ip6gre_dev_free(ign->fb_tunnel_dev);
1350 static void __net_exit ip6gre_exit_net(struct net *net)
1352 struct ip6gre_net *ign;
1355 ign = net_generic(net, ip6gre_net_id);
1357 ip6gre_destroy_tunnels(ign, &list);
1358 unregister_netdevice_many(&list);
1362 static struct pernet_operations ip6gre_net_ops = {
1363 .init = ip6gre_init_net,
1364 .exit = ip6gre_exit_net,
1365 .id = &ip6gre_net_id,
1366 .size = sizeof(struct ip6gre_net),
1369 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1377 if (data[IFLA_GRE_IFLAGS])
1378 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1379 if (data[IFLA_GRE_OFLAGS])
1380 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1381 if (flags & (GRE_VERSION|GRE_ROUTING))
1387 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1389 struct in6_addr daddr;
1391 if (tb[IFLA_ADDRESS]) {
1392 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1394 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1395 return -EADDRNOTAVAIL;
1401 if (data[IFLA_GRE_REMOTE]) {
1402 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1403 if (ipv6_addr_any(&daddr))
1408 return ip6gre_tunnel_validate(tb, data);
1412 static void ip6gre_netlink_parms(struct nlattr *data[],
1413 struct __ip6_tnl_parm *parms)
1415 memset(parms, 0, sizeof(*parms));
1420 if (data[IFLA_GRE_LINK])
1421 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1423 if (data[IFLA_GRE_IFLAGS])
1424 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1426 if (data[IFLA_GRE_OFLAGS])
1427 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1429 if (data[IFLA_GRE_IKEY])
1430 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1432 if (data[IFLA_GRE_OKEY])
1433 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1435 if (data[IFLA_GRE_LOCAL])
1436 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1438 if (data[IFLA_GRE_REMOTE])
1439 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1441 if (data[IFLA_GRE_TTL])
1442 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1444 if (data[IFLA_GRE_ENCAP_LIMIT])
1445 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1447 if (data[IFLA_GRE_FLOWINFO])
1448 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1450 if (data[IFLA_GRE_FLAGS])
1451 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1454 static int ip6gre_tap_init(struct net_device *dev)
1456 struct ip6_tnl *tunnel;
1458 tunnel = netdev_priv(dev);
1461 tunnel->net = dev_net(dev);
1462 strcpy(tunnel->parms.name, dev->name);
1464 ip6gre_tnl_link_config(tunnel, 1);
1466 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1473 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1474 .ndo_init = ip6gre_tap_init,
1475 .ndo_uninit = ip6gre_tunnel_uninit,
1476 .ndo_start_xmit = ip6gre_tunnel_xmit,
1477 .ndo_set_mac_address = eth_mac_addr,
1478 .ndo_validate_addr = eth_validate_addr,
1479 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1480 .ndo_get_stats64 = ip_tunnel_get_stats64,
1483 static void ip6gre_tap_setup(struct net_device *dev)
1488 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1489 dev->destructor = ip6gre_dev_free;
1492 dev->features |= NETIF_F_NETNS_LOCAL;
1495 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1496 struct nlattr *tb[], struct nlattr *data[])
1499 struct net *net = dev_net(dev);
1500 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1503 nt = netdev_priv(dev);
1504 ip6gre_netlink_parms(data, &nt->parms);
1506 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1509 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1510 eth_hw_addr_random(dev);
1513 nt->net = dev_net(dev);
1514 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1516 /* Can use a lockless transmit, unless we generate output sequences */
1517 if (!(nt->parms.o_flags & GRE_SEQ))
1518 dev->features |= NETIF_F_LLTX;
1520 err = register_netdevice(dev);
1525 ip6gre_tunnel_link(ign, nt);
1531 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1532 struct nlattr *data[])
1534 struct ip6_tnl *t, *nt;
1535 struct net *net = dev_net(dev);
1536 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1537 struct __ip6_tnl_parm p;
1539 if (dev == ign->fb_tunnel_dev)
1542 nt = netdev_priv(dev);
1543 ip6gre_netlink_parms(data, &p);
1545 t = ip6gre_tunnel_locate(net, &p, 0);
1553 ip6gre_tunnel_unlink(ign, t);
1554 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1555 ip6gre_tunnel_link(ign, t);
1556 netdev_state_change(dev);
1562 static size_t ip6gre_get_size(const struct net_device *dev)
1567 /* IFLA_GRE_IFLAGS */
1569 /* IFLA_GRE_OFLAGS */
1575 /* IFLA_GRE_LOCAL */
1576 nla_total_size(sizeof(struct in6_addr)) +
1577 /* IFLA_GRE_REMOTE */
1578 nla_total_size(sizeof(struct in6_addr)) +
1583 /* IFLA_GRE_ENCAP_LIMIT */
1585 /* IFLA_GRE_FLOWINFO */
1587 /* IFLA_GRE_FLAGS */
1592 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1594 struct ip6_tnl *t = netdev_priv(dev);
1595 struct __ip6_tnl_parm *p = &t->parms;
1597 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1598 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1599 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1600 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1601 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1602 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1603 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1604 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1605 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1606 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1607 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1608 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1609 goto nla_put_failure;
1616 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1617 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1618 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1619 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1620 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1621 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1622 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1623 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1624 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1625 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1626 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1627 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1630 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1632 .maxtype = IFLA_GRE_MAX,
1633 .policy = ip6gre_policy,
1634 .priv_size = sizeof(struct ip6_tnl),
1635 .setup = ip6gre_tunnel_setup,
1636 .validate = ip6gre_tunnel_validate,
1637 .newlink = ip6gre_newlink,
1638 .changelink = ip6gre_changelink,
1639 .get_size = ip6gre_get_size,
1640 .fill_info = ip6gre_fill_info,
1643 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1644 .kind = "ip6gretap",
1645 .maxtype = IFLA_GRE_MAX,
1646 .policy = ip6gre_policy,
1647 .priv_size = sizeof(struct ip6_tnl),
1648 .setup = ip6gre_tap_setup,
1649 .validate = ip6gre_tap_validate,
1650 .newlink = ip6gre_newlink,
1651 .changelink = ip6gre_changelink,
1652 .get_size = ip6gre_get_size,
1653 .fill_info = ip6gre_fill_info,
1657 * And now the modules code and kernel interface.
1660 static int __init ip6gre_init(void)
1664 pr_info("GRE over IPv6 tunneling driver\n");
1666 err = register_pernet_device(&ip6gre_net_ops);
1670 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1672 pr_info("%s: can't add protocol\n", __func__);
1673 goto add_proto_failed;
1676 err = rtnl_link_register(&ip6gre_link_ops);
1678 goto rtnl_link_failed;
1680 err = rtnl_link_register(&ip6gre_tap_ops);
1682 goto tap_ops_failed;
1688 rtnl_link_unregister(&ip6gre_link_ops);
1690 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1692 unregister_pernet_device(&ip6gre_net_ops);
1696 static void __exit ip6gre_fini(void)
1698 rtnl_link_unregister(&ip6gre_tap_ops);
1699 rtnl_link_unregister(&ip6gre_link_ops);
1700 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1701 unregister_pernet_device(&ip6gre_net_ops);
1704 module_init(ip6gre_init);
1705 module_exit(ip6gre_fini);
1706 MODULE_LICENSE("GPL");
1707 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1708 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1709 MODULE_ALIAS_RTNL_LINK("ip6gre");
1710 MODULE_ALIAS_NETDEV("ip6gre0");