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>
61 static bool log_ecn_error = true;
62 module_param(log_ecn_error, bool, 0644);
63 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
65 #define HASH_SIZE_SHIFT 5
66 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
68 static int ip6gre_net_id __read_mostly;
70 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
72 struct net_device *fb_tunnel_dev;
75 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
76 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
77 static int ip6gre_tunnel_init(struct net_device *dev);
78 static void ip6gre_tunnel_setup(struct net_device *dev);
79 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82 /* Tunnel hash table */
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
101 static u32 HASH_ADDR(const struct in6_addr *addr)
103 u32 hash = ipv6_addr_hash(addr);
105 return hash_32(hash, HASH_SIZE_SHIFT);
108 #define tunnels_r_l tunnels[3]
109 #define tunnels_r tunnels[2]
110 #define tunnels_l tunnels[1]
111 #define tunnels_wc tunnels[0]
113 /* Given src, dst and key, find appropriate for input tunnel. */
115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
125 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
126 ARPHRD_ETHER : ARPHRD_IP6GRE;
127 int score, cand_score = 4;
129 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
130 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
131 !ipv6_addr_equal(remote, &t->parms.raddr) ||
132 key != t->parms.i_key ||
133 !(t->dev->flags & IFF_UP))
136 if (t->dev->type != ARPHRD_IP6GRE &&
137 t->dev->type != dev_type)
141 if (t->parms.link != link)
143 if (t->dev->type != dev_type)
148 if (score < cand_score) {
154 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
155 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
156 key != t->parms.i_key ||
157 !(t->dev->flags & IFF_UP))
160 if (t->dev->type != ARPHRD_IP6GRE &&
161 t->dev->type != dev_type)
165 if (t->parms.link != link)
167 if (t->dev->type != dev_type)
172 if (score < cand_score) {
178 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
179 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
180 (!ipv6_addr_equal(local, &t->parms.raddr) ||
181 !ipv6_addr_is_multicast(local))) ||
182 key != t->parms.i_key ||
183 !(t->dev->flags & IFF_UP))
186 if (t->dev->type != ARPHRD_IP6GRE &&
187 t->dev->type != dev_type)
191 if (t->parms.link != link)
193 if (t->dev->type != dev_type)
198 if (score < cand_score) {
204 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
205 if (t->parms.i_key != key ||
206 !(t->dev->flags & IFF_UP))
209 if (t->dev->type != ARPHRD_IP6GRE &&
210 t->dev->type != dev_type)
214 if (t->parms.link != link)
216 if (t->dev->type != dev_type)
221 if (score < cand_score) {
230 dev = ign->fb_tunnel_dev;
231 if (dev->flags & IFF_UP)
232 return netdev_priv(dev);
237 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
238 const struct __ip6_tnl_parm *p)
240 const struct in6_addr *remote = &p->raddr;
241 const struct in6_addr *local = &p->laddr;
242 unsigned int h = HASH_KEY(p->i_key);
245 if (!ipv6_addr_any(local))
247 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
249 h ^= HASH_ADDR(remote);
252 return &ign->tunnels[prio][h];
255 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
256 const struct ip6_tnl *t)
258 return __ip6gre_bucket(ign, &t->parms);
261 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
263 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
265 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
266 rcu_assign_pointer(*tp, t);
269 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
271 struct ip6_tnl __rcu **tp;
272 struct ip6_tnl *iter;
274 for (tp = ip6gre_bucket(ign, t);
275 (iter = rtnl_dereference(*tp)) != NULL;
278 rcu_assign_pointer(*tp, t->next);
284 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
285 const struct __ip6_tnl_parm *parms,
288 const struct in6_addr *remote = &parms->raddr;
289 const struct in6_addr *local = &parms->laddr;
290 __be32 key = parms->i_key;
291 int link = parms->link;
293 struct ip6_tnl __rcu **tp;
294 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
296 for (tp = __ip6gre_bucket(ign, parms);
297 (t = rtnl_dereference(*tp)) != NULL;
299 if (ipv6_addr_equal(local, &t->parms.laddr) &&
300 ipv6_addr_equal(remote, &t->parms.raddr) &&
301 key == t->parms.i_key &&
302 link == t->parms.link &&
303 type == t->dev->type)
309 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
310 const struct __ip6_tnl_parm *parms, int create)
312 struct ip6_tnl *t, *nt;
313 struct net_device *dev;
315 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
317 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
324 strlcpy(name, parms->name, IFNAMSIZ);
326 strcpy(name, "ip6gre%d");
328 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
329 ip6gre_tunnel_setup);
333 dev_net_set(dev, net);
335 nt = netdev_priv(dev);
337 dev->rtnl_link_ops = &ip6gre_link_ops;
340 nt->net = dev_net(dev);
341 ip6gre_tnl_link_config(nt, 1);
343 if (register_netdevice(dev) < 0)
346 /* Can use a lockless transmit, unless we generate output sequences */
347 if (!(nt->parms.o_flags & GRE_SEQ))
348 dev->features |= NETIF_F_LLTX;
351 ip6gre_tunnel_link(ign, nt);
359 static void ip6gre_tunnel_uninit(struct net_device *dev)
361 struct ip6_tnl *t = netdev_priv(dev);
362 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
364 ip6gre_tunnel_unlink(ign, t);
365 ip6_tnl_dst_reset(t);
370 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
371 u8 type, u8 code, int offset, __be32 info)
373 const struct gre_base_hdr *greh;
374 const struct ipv6hdr *ipv6h;
375 int grehlen = sizeof(*greh);
381 if (!pskb_may_pull(skb, offset + grehlen))
383 greh = (const struct gre_base_hdr *)(skb->data + offset);
385 if (flags & (GRE_VERSION | GRE_ROUTING))
387 if (flags & GRE_CSUM)
389 if (flags & GRE_KEY) {
390 key_off = grehlen + offset;
394 if (!pskb_may_pull(skb, offset + grehlen))
396 ipv6h = (const struct ipv6hdr *)skb->data;
397 greh = (const struct gre_base_hdr *)(skb->data + offset);
398 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
400 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
401 key, greh->protocol);
407 struct ipv6_tlv_tnl_enc_lim *tel;
409 case ICMPV6_DEST_UNREACH:
410 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
413 case ICMPV6_TIME_EXCEED:
414 if (code == ICMPV6_EXC_HOPLIMIT) {
415 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
419 case ICMPV6_PARAMPROB:
421 if (code == ICMPV6_HDR_FIELD)
422 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
424 if (teli && teli == be32_to_cpu(info) - 2) {
425 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
426 if (tel->encap_limit == 0) {
427 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
431 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
435 case ICMPV6_PKT_TOOBIG:
436 mtu = be32_to_cpu(info) - offset;
437 if (mtu < IPV6_MIN_MTU)
443 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
447 t->err_time = jiffies;
450 static int ip6gre_rcv(struct sk_buff *skb)
452 const struct ipv6hdr *ipv6h;
458 struct ip6_tnl *tunnel;
463 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
466 ipv6h = ipv6_hdr(skb);
468 flags = *(__be16 *)h;
470 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
471 /* - Version must be 0.
472 - We do not support routing headers.
474 if (flags&(GRE_VERSION|GRE_ROUTING))
477 if (flags&GRE_CSUM) {
478 csum = skb_checksum_simple_validate(skb);
482 key = *(__be32 *)(h + offset);
486 seqno = ntohl(*(__be32 *)(h + offset));
491 gre_proto = *(__be16 *)(h + 2);
493 tunnel = ip6gre_tunnel_lookup(skb->dev,
494 &ipv6h->saddr, &ipv6h->daddr, key,
497 struct pcpu_sw_netstats *tstats;
499 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
502 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
503 tunnel->dev->stats.rx_dropped++;
507 skb->protocol = gre_proto;
508 /* WCCP version 1 and 2 protocol decoding.
509 * - Change protocol to IPv6
510 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
512 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
513 skb->protocol = htons(ETH_P_IPV6);
514 if ((*(h + offset) & 0xF0) != 0x40)
518 skb->mac_header = skb->network_header;
519 __pskb_pull(skb, offset);
520 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
522 if (((flags&GRE_CSUM) && csum) ||
523 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
524 tunnel->dev->stats.rx_crc_errors++;
525 tunnel->dev->stats.rx_errors++;
528 if (tunnel->parms.i_flags&GRE_SEQ) {
529 if (!(flags&GRE_SEQ) ||
531 (s32)(seqno - tunnel->i_seqno) < 0)) {
532 tunnel->dev->stats.rx_fifo_errors++;
533 tunnel->dev->stats.rx_errors++;
536 tunnel->i_seqno = seqno + 1;
539 /* Warning: All skb pointers will be invalidated! */
540 if (tunnel->dev->type == ARPHRD_ETHER) {
541 if (!pskb_may_pull(skb, ETH_HLEN)) {
542 tunnel->dev->stats.rx_length_errors++;
543 tunnel->dev->stats.rx_errors++;
547 ipv6h = ipv6_hdr(skb);
548 skb->protocol = eth_type_trans(skb, tunnel->dev);
549 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
552 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
554 skb_reset_network_header(skb);
556 err = IP6_ECN_decapsulate(ipv6h, skb);
559 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
561 ipv6_get_dsfield(ipv6h));
563 ++tunnel->dev->stats.rx_frame_errors;
564 ++tunnel->dev->stats.rx_errors;
569 tstats = this_cpu_ptr(tunnel->dev->tstats);
570 u64_stats_update_begin(&tstats->syncp);
571 tstats->rx_packets++;
572 tstats->rx_bytes += skb->len;
573 u64_stats_update_end(&tstats->syncp);
579 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
586 struct ipv6_tel_txoption {
587 struct ipv6_txoptions ops;
591 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
593 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
595 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
597 opt->dst_opt[4] = encap_limit;
598 opt->dst_opt[5] = IPV6_TLV_PADN;
601 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
602 opt->ops.opt_nflen = 8;
605 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
606 struct net_device *dev,
612 struct ip6_tnl *tunnel = netdev_priv(dev);
613 struct net *net = tunnel->net;
614 struct net_device *tdev; /* Device to other host */
615 struct ipv6hdr *ipv6h; /* Our new IP header */
616 unsigned int max_headroom = 0; /* The extra header space needed */
618 struct ipv6_tel_txoption opt;
620 struct dst_entry *dst = NULL, *ndst = NULL;
621 struct net_device_stats *stats = &tunnel->dev->stats;
624 struct sk_buff *new_skb;
627 if (dev->type == ARPHRD_ETHER)
628 IPCB(skb)->flags = 0;
630 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
632 ipv6h = (struct ipv6hdr *)skb->data;
633 fl6->daddr = ipv6h->daddr;
635 gre_hlen = tunnel->hlen;
636 fl6->daddr = tunnel->parms.raddr;
639 if (!fl6->flowi6_mark)
640 dst = ip6_tnl_dst_get(tunnel);
643 dst = ip6_route_output(net, NULL, fl6);
646 goto tx_err_link_failure;
647 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
651 goto tx_err_link_failure;
660 net_warn_ratelimited("%s: Local routing loop detected!\n",
662 goto tx_err_dst_release;
665 mtu = dst_mtu(dst) - sizeof(*ipv6h);
666 if (encap_limit >= 0) {
670 if (mtu < IPV6_MIN_MTU)
673 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
674 if (skb->len > mtu) {
677 goto tx_err_dst_release;
680 if (tunnel->err_count > 0) {
681 if (time_before(jiffies,
682 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
685 dst_link_failure(skb);
687 tunnel->err_count = 0;
690 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
692 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
694 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
695 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
696 new_skb = skb_realloc_headroom(skb, max_headroom);
697 if (max_headroom > dev->needed_headroom)
698 dev->needed_headroom = max_headroom;
700 goto tx_err_dst_release;
703 skb_set_owner_w(new_skb, skb->sk);
708 if (!fl6->flowi6_mark && ndst)
709 ip6_tnl_dst_set(tunnel, ndst);
710 skb_dst_set(skb, dst);
713 if (encap_limit >= 0) {
714 init_tel_txopt(&opt, encap_limit);
715 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
718 if (likely(!skb->encapsulation)) {
719 skb_reset_inner_headers(skb);
720 skb->encapsulation = 1;
723 skb_push(skb, gre_hlen);
724 skb_reset_network_header(skb);
725 skb_set_transport_header(skb, sizeof(*ipv6h));
728 * Push down and install the IP header.
730 ipv6h = ipv6_hdr(skb);
731 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
732 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
733 ipv6h->hop_limit = tunnel->parms.hop_limit;
734 ipv6h->nexthdr = proto;
735 ipv6h->saddr = fl6->saddr;
736 ipv6h->daddr = fl6->daddr;
738 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
739 protocol = (dev->type == ARPHRD_ETHER) ?
740 htons(ETH_P_TEB) : skb->protocol;
741 ((__be16 *)(ipv6h + 1))[1] = protocol;
743 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
744 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
746 if (tunnel->parms.o_flags&GRE_SEQ) {
748 *ptr = htonl(tunnel->o_seqno);
751 if (tunnel->parms.o_flags&GRE_KEY) {
752 *ptr = tunnel->parms.o_key;
755 if (tunnel->parms.o_flags&GRE_CSUM) {
757 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
758 skb->len - sizeof(struct ipv6hdr));
762 skb_set_inner_protocol(skb, protocol);
764 ip6tunnel_xmit(NULL, skb, dev);
767 stats->tx_carrier_errors++;
768 dst_link_failure(skb);
774 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
776 struct ip6_tnl *t = netdev_priv(dev);
777 const struct iphdr *iph = ip_hdr(skb);
778 int encap_limit = -1;
784 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
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_GRE;
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_GRE;
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));
893 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
898 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
899 struct net_device *dev)
901 struct ip6_tnl *t = netdev_priv(dev);
902 struct net_device_stats *stats = &t->dev->stats;
905 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
908 switch (skb->protocol) {
909 case htons(ETH_P_IP):
910 ret = ip6gre_xmit_ipv4(skb, dev);
912 case htons(ETH_P_IPV6):
913 ret = ip6gre_xmit_ipv6(skb, dev);
916 ret = ip6gre_xmit_other(skb, dev);
932 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
934 struct net_device *dev = t->dev;
935 struct __ip6_tnl_parm *p = &t->parms;
936 struct flowi6 *fl6 = &t->fl.u.ip6;
937 int addend = sizeof(struct ipv6hdr) + 4;
939 if (dev->type != ARPHRD_ETHER) {
940 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
941 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
944 /* Set up flowi template */
945 fl6->saddr = p->laddr;
946 fl6->daddr = p->raddr;
947 fl6->flowi6_oif = p->link;
950 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
951 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
952 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
953 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
955 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
956 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
958 if (p->flags&IP6_TNL_F_CAP_XMIT &&
959 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
960 dev->flags |= IFF_POINTOPOINT;
962 dev->flags &= ~IFF_POINTOPOINT;
964 /* Precalculate GRE options length */
965 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
966 if (t->parms.o_flags&GRE_CSUM)
968 if (t->parms.o_flags&GRE_KEY)
970 if (t->parms.o_flags&GRE_SEQ)
975 if (p->flags & IP6_TNL_F_CAP_XMIT) {
976 int strict = (ipv6_addr_type(&p->raddr) &
977 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
979 struct rt6_info *rt = rt6_lookup(t->net,
980 &p->raddr, &p->laddr,
987 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
990 dev->mtu = rt->dst.dev->mtu - addend;
991 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
994 if (dev->mtu < IPV6_MIN_MTU)
995 dev->mtu = IPV6_MIN_MTU;
1002 static int ip6gre_tnl_change(struct ip6_tnl *t,
1003 const struct __ip6_tnl_parm *p, int set_mtu)
1005 t->parms.laddr = p->laddr;
1006 t->parms.raddr = p->raddr;
1007 t->parms.flags = p->flags;
1008 t->parms.hop_limit = p->hop_limit;
1009 t->parms.encap_limit = p->encap_limit;
1010 t->parms.flowinfo = p->flowinfo;
1011 t->parms.link = p->link;
1012 t->parms.proto = p->proto;
1013 t->parms.i_key = p->i_key;
1014 t->parms.o_key = p->o_key;
1015 t->parms.i_flags = p->i_flags;
1016 t->parms.o_flags = p->o_flags;
1017 ip6_tnl_dst_reset(t);
1018 ip6gre_tnl_link_config(t, set_mtu);
1022 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1023 const struct ip6_tnl_parm2 *u)
1025 p->laddr = u->laddr;
1026 p->raddr = u->raddr;
1027 p->flags = u->flags;
1028 p->hop_limit = u->hop_limit;
1029 p->encap_limit = u->encap_limit;
1030 p->flowinfo = u->flowinfo;
1032 p->i_key = u->i_key;
1033 p->o_key = u->o_key;
1034 p->i_flags = u->i_flags;
1035 p->o_flags = u->o_flags;
1036 memcpy(p->name, u->name, sizeof(u->name));
1039 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1040 const struct __ip6_tnl_parm *p)
1042 u->proto = IPPROTO_GRE;
1043 u->laddr = p->laddr;
1044 u->raddr = p->raddr;
1045 u->flags = p->flags;
1046 u->hop_limit = p->hop_limit;
1047 u->encap_limit = p->encap_limit;
1048 u->flowinfo = p->flowinfo;
1050 u->i_key = p->i_key;
1051 u->o_key = p->o_key;
1052 u->i_flags = p->i_flags;
1053 u->o_flags = p->o_flags;
1054 memcpy(u->name, p->name, sizeof(u->name));
1057 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1058 struct ifreq *ifr, int cmd)
1061 struct ip6_tnl_parm2 p;
1062 struct __ip6_tnl_parm p1;
1063 struct ip6_tnl *t = netdev_priv(dev);
1064 struct net *net = t->net;
1065 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1069 if (dev == ign->fb_tunnel_dev) {
1070 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1074 ip6gre_tnl_parm_from_user(&p1, &p);
1075 t = ip6gre_tunnel_locate(net, &p1, 0);
1077 t = netdev_priv(dev);
1079 memset(&p, 0, sizeof(p));
1080 ip6gre_tnl_parm_to_user(&p, &t->parms);
1081 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1088 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1092 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1096 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1099 if (!(p.i_flags&GRE_KEY))
1101 if (!(p.o_flags&GRE_KEY))
1104 ip6gre_tnl_parm_from_user(&p1, &p);
1105 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1107 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1109 if (t->dev != dev) {
1114 t = netdev_priv(dev);
1116 ip6gre_tunnel_unlink(ign, t);
1118 ip6gre_tnl_change(t, &p1, 1);
1119 ip6gre_tunnel_link(ign, t);
1120 netdev_state_change(dev);
1127 memset(&p, 0, sizeof(p));
1128 ip6gre_tnl_parm_to_user(&p, &t->parms);
1129 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1132 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1137 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1140 if (dev == ign->fb_tunnel_dev) {
1142 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1145 ip6gre_tnl_parm_from_user(&p1, &p);
1146 t = ip6gre_tunnel_locate(net, &p1, 0);
1150 if (t == netdev_priv(ign->fb_tunnel_dev))
1154 unregister_netdevice(dev);
1166 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1169 new_mtu > 0xFFF8 - dev->hard_header_len)
1175 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1176 unsigned short type,
1177 const void *daddr, const void *saddr, unsigned int len)
1179 struct ip6_tnl *t = netdev_priv(dev);
1180 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1181 __be16 *p = (__be16 *)(ipv6h+1);
1183 ip6_flow_hdr(ipv6h, 0,
1184 ip6_make_flowlabel(dev_net(dev), skb,
1185 t->fl.u.ip6.flowlabel, true,
1187 ipv6h->hop_limit = t->parms.hop_limit;
1188 ipv6h->nexthdr = NEXTHDR_GRE;
1189 ipv6h->saddr = t->parms.laddr;
1190 ipv6h->daddr = t->parms.raddr;
1192 p[0] = t->parms.o_flags;
1196 * Set the source hardware address.
1200 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1202 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1203 if (!ipv6_addr_any(&ipv6h->daddr))
1209 static const struct header_ops ip6gre_header_ops = {
1210 .create = ip6gre_header,
1213 static const struct net_device_ops ip6gre_netdev_ops = {
1214 .ndo_init = ip6gre_tunnel_init,
1215 .ndo_uninit = ip6gre_tunnel_uninit,
1216 .ndo_start_xmit = ip6gre_tunnel_xmit,
1217 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1218 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1219 .ndo_get_stats64 = ip_tunnel_get_stats64,
1220 .ndo_get_iflink = ip6_tnl_get_iflink,
1223 static void ip6gre_dev_free(struct net_device *dev)
1225 struct ip6_tnl *t = netdev_priv(dev);
1227 ip6_tnl_dst_destroy(t);
1228 free_percpu(dev->tstats);
1232 static void ip6gre_tunnel_setup(struct net_device *dev)
1236 dev->netdev_ops = &ip6gre_netdev_ops;
1237 dev->destructor = ip6gre_dev_free;
1239 dev->type = ARPHRD_IP6GRE;
1240 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1241 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1242 t = netdev_priv(dev);
1243 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1245 dev->flags |= IFF_NOARP;
1246 dev->addr_len = sizeof(struct in6_addr);
1247 netif_keep_dst(dev);
1250 static int ip6gre_tunnel_init_common(struct net_device *dev)
1252 struct ip6_tnl *tunnel;
1255 tunnel = netdev_priv(dev);
1258 tunnel->net = dev_net(dev);
1259 strcpy(tunnel->parms.name, dev->name);
1261 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1265 ret = ip6_tnl_dst_init(tunnel);
1267 free_percpu(dev->tstats);
1275 static int ip6gre_tunnel_init(struct net_device *dev)
1277 struct ip6_tnl *tunnel;
1280 ret = ip6gre_tunnel_init_common(dev);
1284 tunnel = netdev_priv(dev);
1286 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1287 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1289 if (ipv6_addr_any(&tunnel->parms.raddr))
1290 dev->header_ops = &ip6gre_header_ops;
1295 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1297 struct ip6_tnl *tunnel = netdev_priv(dev);
1300 tunnel->net = dev_net(dev);
1301 strcpy(tunnel->parms.name, dev->name);
1303 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1309 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1310 .handler = ip6gre_rcv,
1311 .err_handler = ip6gre_err,
1312 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1315 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1317 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1318 struct net_device *dev, *aux;
1321 for_each_netdev_safe(net, dev, aux)
1322 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1323 dev->rtnl_link_ops == &ip6gre_tap_ops)
1324 unregister_netdevice_queue(dev, head);
1326 for (prio = 0; prio < 4; prio++) {
1328 for (h = 0; h < HASH_SIZE; h++) {
1331 t = rtnl_dereference(ign->tunnels[prio][h]);
1334 /* If dev is in the same netns, it has already
1335 * been added to the list by the previous loop.
1337 if (!net_eq(dev_net(t->dev), net))
1338 unregister_netdevice_queue(t->dev,
1340 t = rtnl_dereference(t->next);
1346 static int __net_init ip6gre_init_net(struct net *net)
1348 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1351 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1353 ip6gre_tunnel_setup);
1354 if (!ign->fb_tunnel_dev) {
1358 dev_net_set(ign->fb_tunnel_dev, net);
1359 /* FB netdevice is special: we have one, and only one per netns.
1360 * Allowing to move it to another netns is clearly unsafe.
1362 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1365 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1366 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1368 err = register_netdev(ign->fb_tunnel_dev);
1372 rcu_assign_pointer(ign->tunnels_wc[0],
1373 netdev_priv(ign->fb_tunnel_dev));
1377 ip6gre_dev_free(ign->fb_tunnel_dev);
1382 static void __net_exit ip6gre_exit_net(struct net *net)
1387 ip6gre_destroy_tunnels(net, &list);
1388 unregister_netdevice_many(&list);
1392 static struct pernet_operations ip6gre_net_ops = {
1393 .init = ip6gre_init_net,
1394 .exit = ip6gre_exit_net,
1395 .id = &ip6gre_net_id,
1396 .size = sizeof(struct ip6gre_net),
1399 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1407 if (data[IFLA_GRE_IFLAGS])
1408 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1409 if (data[IFLA_GRE_OFLAGS])
1410 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1411 if (flags & (GRE_VERSION|GRE_ROUTING))
1417 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1419 struct in6_addr daddr;
1421 if (tb[IFLA_ADDRESS]) {
1422 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1424 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1425 return -EADDRNOTAVAIL;
1431 if (data[IFLA_GRE_REMOTE]) {
1432 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1433 if (ipv6_addr_any(&daddr))
1438 return ip6gre_tunnel_validate(tb, data);
1442 static void ip6gre_netlink_parms(struct nlattr *data[],
1443 struct __ip6_tnl_parm *parms)
1445 memset(parms, 0, sizeof(*parms));
1450 if (data[IFLA_GRE_LINK])
1451 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1453 if (data[IFLA_GRE_IFLAGS])
1454 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1456 if (data[IFLA_GRE_OFLAGS])
1457 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1459 if (data[IFLA_GRE_IKEY])
1460 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1462 if (data[IFLA_GRE_OKEY])
1463 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1465 if (data[IFLA_GRE_LOCAL])
1466 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1468 if (data[IFLA_GRE_REMOTE])
1469 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1471 if (data[IFLA_GRE_TTL])
1472 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1474 if (data[IFLA_GRE_ENCAP_LIMIT])
1475 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1477 if (data[IFLA_GRE_FLOWINFO])
1478 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1480 if (data[IFLA_GRE_FLAGS])
1481 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1484 static int ip6gre_tap_init(struct net_device *dev)
1486 struct ip6_tnl *tunnel;
1489 ret = ip6gre_tunnel_init_common(dev);
1493 tunnel = netdev_priv(dev);
1495 ip6gre_tnl_link_config(tunnel, 1);
1500 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1501 .ndo_init = ip6gre_tap_init,
1502 .ndo_uninit = ip6gre_tunnel_uninit,
1503 .ndo_start_xmit = ip6gre_tunnel_xmit,
1504 .ndo_set_mac_address = eth_mac_addr,
1505 .ndo_validate_addr = eth_validate_addr,
1506 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1507 .ndo_get_stats64 = ip_tunnel_get_stats64,
1508 .ndo_get_iflink = ip6_tnl_get_iflink,
1511 static void ip6gre_tap_setup(struct net_device *dev)
1516 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1517 dev->destructor = ip6gre_dev_free;
1519 dev->features |= NETIF_F_NETNS_LOCAL;
1522 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1523 struct nlattr *tb[], struct nlattr *data[])
1526 struct net *net = dev_net(dev);
1527 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1530 nt = netdev_priv(dev);
1531 ip6gre_netlink_parms(data, &nt->parms);
1533 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1536 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1537 eth_hw_addr_random(dev);
1540 nt->net = dev_net(dev);
1541 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1543 /* Can use a lockless transmit, unless we generate output sequences */
1544 if (!(nt->parms.o_flags & GRE_SEQ))
1545 dev->features |= NETIF_F_LLTX;
1547 err = register_netdevice(dev);
1552 ip6gre_tunnel_link(ign, nt);
1558 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1559 struct nlattr *data[])
1561 struct ip6_tnl *t, *nt = netdev_priv(dev);
1562 struct net *net = nt->net;
1563 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1564 struct __ip6_tnl_parm p;
1566 if (dev == ign->fb_tunnel_dev)
1569 ip6gre_netlink_parms(data, &p);
1571 t = ip6gre_tunnel_locate(net, &p, 0);
1580 ip6gre_tunnel_unlink(ign, t);
1581 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1582 ip6gre_tunnel_link(ign, t);
1586 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1588 struct net *net = dev_net(dev);
1589 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1591 if (dev != ign->fb_tunnel_dev)
1592 unregister_netdevice_queue(dev, head);
1595 static size_t ip6gre_get_size(const struct net_device *dev)
1600 /* IFLA_GRE_IFLAGS */
1602 /* IFLA_GRE_OFLAGS */
1608 /* IFLA_GRE_LOCAL */
1609 nla_total_size(sizeof(struct in6_addr)) +
1610 /* IFLA_GRE_REMOTE */
1611 nla_total_size(sizeof(struct in6_addr)) +
1616 /* IFLA_GRE_ENCAP_LIMIT */
1618 /* IFLA_GRE_FLOWINFO */
1620 /* IFLA_GRE_FLAGS */
1625 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1627 struct ip6_tnl *t = netdev_priv(dev);
1628 struct __ip6_tnl_parm *p = &t->parms;
1630 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1631 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1632 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1633 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1634 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1635 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1636 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1637 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1638 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1639 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1640 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1641 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1642 goto nla_put_failure;
1649 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1650 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1651 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1652 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1653 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1654 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1655 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1656 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1657 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1658 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1659 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1660 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1663 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1665 .maxtype = IFLA_GRE_MAX,
1666 .policy = ip6gre_policy,
1667 .priv_size = sizeof(struct ip6_tnl),
1668 .setup = ip6gre_tunnel_setup,
1669 .validate = ip6gre_tunnel_validate,
1670 .newlink = ip6gre_newlink,
1671 .changelink = ip6gre_changelink,
1672 .dellink = ip6gre_dellink,
1673 .get_size = ip6gre_get_size,
1674 .fill_info = ip6gre_fill_info,
1675 .get_link_net = ip6_tnl_get_link_net,
1678 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1679 .kind = "ip6gretap",
1680 .maxtype = IFLA_GRE_MAX,
1681 .policy = ip6gre_policy,
1682 .priv_size = sizeof(struct ip6_tnl),
1683 .setup = ip6gre_tap_setup,
1684 .validate = ip6gre_tap_validate,
1685 .newlink = ip6gre_newlink,
1686 .changelink = ip6gre_changelink,
1687 .get_size = ip6gre_get_size,
1688 .fill_info = ip6gre_fill_info,
1689 .get_link_net = ip6_tnl_get_link_net,
1693 * And now the modules code and kernel interface.
1696 static int __init ip6gre_init(void)
1700 pr_info("GRE over IPv6 tunneling driver\n");
1702 err = register_pernet_device(&ip6gre_net_ops);
1706 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1708 pr_info("%s: can't add protocol\n", __func__);
1709 goto add_proto_failed;
1712 err = rtnl_link_register(&ip6gre_link_ops);
1714 goto rtnl_link_failed;
1716 err = rtnl_link_register(&ip6gre_tap_ops);
1718 goto tap_ops_failed;
1724 rtnl_link_unregister(&ip6gre_link_ops);
1726 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1728 unregister_pernet_device(&ip6gre_net_ops);
1732 static void __exit ip6gre_fini(void)
1734 rtnl_link_unregister(&ip6gre_tap_ops);
1735 rtnl_link_unregister(&ip6gre_link_ops);
1736 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1737 unregister_pernet_device(&ip6gre_net_ops);
1740 module_init(ip6gre_init);
1741 module_exit(ip6gre_fini);
1742 MODULE_LICENSE("GPL");
1743 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1744 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1745 MODULE_ALIAS_RTNL_LINK("ip6gre");
1746 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1747 MODULE_ALIAS_NETDEV("ip6gre0");