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;
128 struct net_device *ndev;
130 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
131 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
132 !ipv6_addr_equal(remote, &t->parms.raddr) ||
133 key != t->parms.i_key ||
134 !(t->dev->flags & IFF_UP))
137 if (t->dev->type != ARPHRD_IP6GRE &&
138 t->dev->type != dev_type)
142 if (t->parms.link != link)
144 if (t->dev->type != dev_type)
149 if (score < cand_score) {
155 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
156 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
157 key != t->parms.i_key ||
158 !(t->dev->flags & IFF_UP))
161 if (t->dev->type != ARPHRD_IP6GRE &&
162 t->dev->type != dev_type)
166 if (t->parms.link != link)
168 if (t->dev->type != dev_type)
173 if (score < cand_score) {
179 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
180 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
181 (!ipv6_addr_equal(local, &t->parms.raddr) ||
182 !ipv6_addr_is_multicast(local))) ||
183 key != t->parms.i_key ||
184 !(t->dev->flags & IFF_UP))
187 if (t->dev->type != ARPHRD_IP6GRE &&
188 t->dev->type != dev_type)
192 if (t->parms.link != link)
194 if (t->dev->type != dev_type)
199 if (score < cand_score) {
205 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
206 if (t->parms.i_key != key ||
207 !(t->dev->flags & IFF_UP))
210 if (t->dev->type != ARPHRD_IP6GRE &&
211 t->dev->type != dev_type)
215 if (t->parms.link != link)
217 if (t->dev->type != dev_type)
222 if (score < cand_score) {
231 ndev = READ_ONCE(ign->fb_tunnel_dev);
232 if (ndev && ndev->flags & IFF_UP)
233 return netdev_priv(ndev);
238 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
239 const struct __ip6_tnl_parm *p)
241 const struct in6_addr *remote = &p->raddr;
242 const struct in6_addr *local = &p->laddr;
243 unsigned int h = HASH_KEY(p->i_key);
246 if (!ipv6_addr_any(local))
248 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
250 h ^= HASH_ADDR(remote);
253 return &ign->tunnels[prio][h];
256 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
257 const struct ip6_tnl *t)
259 return __ip6gre_bucket(ign, &t->parms);
262 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
264 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
266 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
267 rcu_assign_pointer(*tp, t);
270 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
272 struct ip6_tnl __rcu **tp;
273 struct ip6_tnl *iter;
275 for (tp = ip6gre_bucket(ign, t);
276 (iter = rtnl_dereference(*tp)) != NULL;
279 rcu_assign_pointer(*tp, t->next);
285 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
286 const struct __ip6_tnl_parm *parms,
289 const struct in6_addr *remote = &parms->raddr;
290 const struct in6_addr *local = &parms->laddr;
291 __be32 key = parms->i_key;
292 int link = parms->link;
294 struct ip6_tnl __rcu **tp;
295 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
297 for (tp = __ip6gre_bucket(ign, parms);
298 (t = rtnl_dereference(*tp)) != NULL;
300 if (ipv6_addr_equal(local, &t->parms.laddr) &&
301 ipv6_addr_equal(remote, &t->parms.raddr) &&
302 key == t->parms.i_key &&
303 link == t->parms.link &&
304 type == t->dev->type)
310 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
311 const struct __ip6_tnl_parm *parms, int create)
313 struct ip6_tnl *t, *nt;
314 struct net_device *dev;
316 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
318 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
324 if (parms->name[0]) {
325 if (!dev_valid_name(parms->name))
327 strlcpy(name, parms->name, IFNAMSIZ);
329 strcpy(name, "ip6gre%d");
331 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
332 ip6gre_tunnel_setup);
336 dev_net_set(dev, net);
338 nt = netdev_priv(dev);
340 dev->rtnl_link_ops = &ip6gre_link_ops;
343 nt->net = dev_net(dev);
344 ip6gre_tnl_link_config(nt, 1);
346 if (register_netdevice(dev) < 0)
349 /* Can use a lockless transmit, unless we generate output sequences */
350 if (!(nt->parms.o_flags & GRE_SEQ))
351 dev->features |= NETIF_F_LLTX;
353 ip6gre_tunnel_link(ign, nt);
361 static void ip6gre_tunnel_uninit(struct net_device *dev)
363 struct ip6_tnl *t = netdev_priv(dev);
364 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
366 ip6gre_tunnel_unlink(ign, t);
367 if (ign->fb_tunnel_dev == dev)
368 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
369 dst_cache_reset(&t->dst_cache);
374 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
375 u8 type, u8 code, int offset, __be32 info)
377 const struct gre_base_hdr *greh;
378 const struct ipv6hdr *ipv6h;
379 int grehlen = sizeof(*greh);
385 if (!pskb_may_pull(skb, offset + grehlen))
387 greh = (const struct gre_base_hdr *)(skb->data + offset);
389 if (flags & (GRE_VERSION | GRE_ROUTING))
391 if (flags & GRE_CSUM)
393 if (flags & GRE_KEY) {
394 key_off = grehlen + offset;
398 if (!pskb_may_pull(skb, offset + grehlen))
400 ipv6h = (const struct ipv6hdr *)skb->data;
401 greh = (const struct gre_base_hdr *)(skb->data + offset);
402 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
404 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
405 key, greh->protocol);
411 struct ipv6_tlv_tnl_enc_lim *tel;
413 case ICMPV6_DEST_UNREACH:
414 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
416 if (code != ICMPV6_PORT_UNREACH)
419 case ICMPV6_TIME_EXCEED:
420 if (code == ICMPV6_EXC_HOPLIMIT) {
421 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
426 case ICMPV6_PARAMPROB:
428 if (code == ICMPV6_HDR_FIELD)
429 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
431 if (teli && teli == be32_to_cpu(info) - 2) {
432 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
433 if (tel->encap_limit == 0) {
434 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
438 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
442 case ICMPV6_PKT_TOOBIG:
443 mtu = be32_to_cpu(info) - offset;
444 if (mtu < IPV6_MIN_MTU)
450 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
454 t->err_time = jiffies;
457 static int ip6gre_rcv(struct sk_buff *skb)
459 const struct ipv6hdr *ipv6h;
465 struct ip6_tnl *tunnel;
470 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
473 ipv6h = ipv6_hdr(skb);
475 flags = *(__be16 *)h;
477 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
478 /* - Version must be 0.
479 - We do not support routing headers.
481 if (flags&(GRE_VERSION|GRE_ROUTING))
484 if (flags&GRE_CSUM) {
485 csum = skb_checksum_simple_validate(skb);
489 key = *(__be32 *)(h + offset);
493 seqno = ntohl(*(__be32 *)(h + offset));
498 gre_proto = *(__be16 *)(h + 2);
500 tunnel = ip6gre_tunnel_lookup(skb->dev,
501 &ipv6h->saddr, &ipv6h->daddr, key,
504 struct pcpu_sw_netstats *tstats;
506 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
509 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
510 tunnel->dev->stats.rx_dropped++;
514 skb->protocol = gre_proto;
515 /* WCCP version 1 and 2 protocol decoding.
516 * - Change protocol to IPv6
517 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
519 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
520 skb->protocol = htons(ETH_P_IPV6);
521 if ((*(h + offset) & 0xF0) != 0x40)
525 skb->mac_header = skb->network_header;
526 __pskb_pull(skb, offset);
527 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
529 if (((flags&GRE_CSUM) && csum) ||
530 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
531 tunnel->dev->stats.rx_crc_errors++;
532 tunnel->dev->stats.rx_errors++;
535 if (tunnel->parms.i_flags&GRE_SEQ) {
536 if (!(flags&GRE_SEQ) ||
538 (s32)(seqno - tunnel->i_seqno) < 0)) {
539 tunnel->dev->stats.rx_fifo_errors++;
540 tunnel->dev->stats.rx_errors++;
543 tunnel->i_seqno = seqno + 1;
546 /* Warning: All skb pointers will be invalidated! */
547 if (tunnel->dev->type == ARPHRD_ETHER) {
548 if (!pskb_may_pull(skb, ETH_HLEN)) {
549 tunnel->dev->stats.rx_length_errors++;
550 tunnel->dev->stats.rx_errors++;
554 ipv6h = ipv6_hdr(skb);
555 skb->protocol = eth_type_trans(skb, tunnel->dev);
556 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
559 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
561 skb_reset_network_header(skb);
563 err = IP6_ECN_decapsulate(ipv6h, skb);
566 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
568 ipv6_get_dsfield(ipv6h));
570 ++tunnel->dev->stats.rx_frame_errors;
571 ++tunnel->dev->stats.rx_errors;
576 tstats = this_cpu_ptr(tunnel->dev->tstats);
577 u64_stats_update_begin(&tstats->syncp);
578 tstats->rx_packets++;
579 tstats->rx_bytes += skb->len;
580 u64_stats_update_end(&tstats->syncp);
586 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
593 struct ipv6_tel_txoption {
594 struct ipv6_txoptions ops;
598 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
600 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
602 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
604 opt->dst_opt[4] = encap_limit;
605 opt->dst_opt[5] = IPV6_TLV_PADN;
608 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
609 opt->ops.opt_nflen = 8;
612 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
613 struct net_device *dev,
619 struct ip6_tnl *tunnel = netdev_priv(dev);
620 struct net *net = tunnel->net;
621 struct net_device *tdev; /* Device to other host */
622 struct ipv6hdr *ipv6h; /* Our new IP header */
623 unsigned int max_headroom = 0; /* The extra header space needed */
625 struct ipv6_tel_txoption opt;
627 struct dst_entry *dst = NULL, *ndst = NULL;
628 struct net_device_stats *stats = &tunnel->dev->stats;
631 struct sk_buff *new_skb;
634 if (dev->type == ARPHRD_ETHER)
635 IPCB(skb)->flags = 0;
637 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
639 ipv6h = (struct ipv6hdr *)skb->data;
640 fl6->daddr = ipv6h->daddr;
642 gre_hlen = tunnel->hlen;
643 fl6->daddr = tunnel->parms.raddr;
646 if (!fl6->flowi6_mark)
647 dst = dst_cache_get(&tunnel->dst_cache);
650 dst = ip6_route_output(net, NULL, fl6);
653 goto tx_err_link_failure;
654 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
658 goto tx_err_link_failure;
667 net_warn_ratelimited("%s: Local routing loop detected!\n",
669 goto tx_err_dst_release;
672 mtu = dst_mtu(dst) - sizeof(*ipv6h);
673 if (encap_limit >= 0) {
677 if (mtu < IPV6_MIN_MTU)
680 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
681 if (skb->len > mtu) {
684 goto tx_err_dst_release;
687 if (tunnel->err_count > 0) {
688 if (time_before(jiffies,
689 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
692 dst_link_failure(skb);
694 tunnel->err_count = 0;
697 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
699 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
701 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
702 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
703 new_skb = skb_realloc_headroom(skb, max_headroom);
704 if (max_headroom > dev->needed_headroom)
705 dev->needed_headroom = max_headroom;
707 goto tx_err_dst_release;
710 skb_set_owner_w(new_skb, skb->sk);
715 if (!fl6->flowi6_mark && ndst)
716 dst_cache_set_ip6(&tunnel->dst_cache, ndst, &fl6->saddr);
717 skb_dst_set(skb, dst);
720 if (encap_limit >= 0) {
721 init_tel_txopt(&opt, encap_limit);
722 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
725 if (likely(!skb->encapsulation)) {
726 skb_reset_inner_headers(skb);
727 skb->encapsulation = 1;
730 skb_push(skb, gre_hlen);
731 skb_reset_network_header(skb);
732 skb_set_transport_header(skb, sizeof(*ipv6h));
735 * Push down and install the IP header.
737 ipv6h = ipv6_hdr(skb);
738 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
739 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
740 ipv6h->hop_limit = tunnel->parms.hop_limit;
741 ipv6h->nexthdr = proto;
742 ipv6h->saddr = fl6->saddr;
743 ipv6h->daddr = fl6->daddr;
745 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
746 protocol = (dev->type == ARPHRD_ETHER) ?
747 htons(ETH_P_TEB) : skb->protocol;
748 ((__be16 *)(ipv6h + 1))[1] = protocol;
750 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
751 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
753 if (tunnel->parms.o_flags&GRE_SEQ) {
755 *ptr = htonl(tunnel->o_seqno);
758 if (tunnel->parms.o_flags&GRE_KEY) {
759 *ptr = tunnel->parms.o_key;
762 if (tunnel->parms.o_flags&GRE_CSUM) {
764 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
765 skb->len - sizeof(struct ipv6hdr));
769 skb_set_inner_protocol(skb, protocol);
771 ip6tunnel_xmit(NULL, skb, dev);
774 stats->tx_carrier_errors++;
775 dst_link_failure(skb);
781 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
783 struct ip6_tnl *t = netdev_priv(dev);
784 const struct iphdr *iph = ip_hdr(skb);
785 int encap_limit = -1;
791 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
793 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
794 encap_limit = t->parms.encap_limit;
796 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
797 fl6.flowi6_proto = IPPROTO_GRE;
799 dsfield = ipv4_get_dsfield(iph);
801 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
802 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
804 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
805 fl6.flowi6_mark = skb->mark;
807 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
809 /* XXX: send ICMP error even if DF is not set. */
810 if (err == -EMSGSIZE)
811 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
819 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
821 struct ip6_tnl *t = netdev_priv(dev);
822 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
823 int encap_limit = -1;
830 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
833 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
835 struct ipv6_tlv_tnl_enc_lim *tel;
836 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
837 if (tel->encap_limit == 0) {
838 icmpv6_send(skb, ICMPV6_PARAMPROB,
839 ICMPV6_HDR_FIELD, offset + 2);
842 encap_limit = tel->encap_limit - 1;
843 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
844 encap_limit = t->parms.encap_limit;
846 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
847 fl6.flowi6_proto = IPPROTO_GRE;
849 dsfield = ipv6_get_dsfield(ipv6h);
850 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
851 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
852 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
853 fl6.flowlabel |= ip6_flowlabel(ipv6h);
854 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
855 fl6.flowi6_mark = skb->mark;
857 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
859 if (err == -EMSGSIZE)
860 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
868 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
869 * @t: the outgoing tunnel device
870 * @hdr: IPv6 header from the incoming packet
873 * Avoid trivial tunneling loop by checking that tunnel exit-point
874 * doesn't match source of incoming packet.
881 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
882 const struct ipv6hdr *hdr)
884 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
887 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
889 struct ip6_tnl *t = netdev_priv(dev);
890 int encap_limit = -1;
895 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
896 encap_limit = t->parms.encap_limit;
898 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
900 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
905 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
906 struct net_device *dev)
908 struct ip6_tnl *t = netdev_priv(dev);
909 struct net_device_stats *stats = &t->dev->stats;
912 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
915 switch (skb->protocol) {
916 case htons(ETH_P_IP):
917 ret = ip6gre_xmit_ipv4(skb, dev);
919 case htons(ETH_P_IPV6):
920 ret = ip6gre_xmit_ipv6(skb, dev);
923 ret = ip6gre_xmit_other(skb, dev);
939 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
941 struct net_device *dev = t->dev;
942 struct __ip6_tnl_parm *p = &t->parms;
943 struct flowi6 *fl6 = &t->fl.u.ip6;
944 int addend = sizeof(struct ipv6hdr) + 4;
946 if (dev->type != ARPHRD_ETHER) {
947 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
948 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
951 /* Set up flowi template */
952 fl6->saddr = p->laddr;
953 fl6->daddr = p->raddr;
954 fl6->flowi6_oif = p->link;
957 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
958 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
959 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
960 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
962 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
963 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
965 if (p->flags&IP6_TNL_F_CAP_XMIT &&
966 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
967 dev->flags |= IFF_POINTOPOINT;
969 dev->flags &= ~IFF_POINTOPOINT;
971 /* Precalculate GRE options length */
972 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
973 if (t->parms.o_flags&GRE_CSUM)
975 if (t->parms.o_flags&GRE_KEY)
977 if (t->parms.o_flags&GRE_SEQ)
982 if (p->flags & IP6_TNL_F_CAP_XMIT) {
983 int strict = (ipv6_addr_type(&p->raddr) &
984 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
986 struct rt6_info *rt = rt6_lookup(t->net,
987 &p->raddr, &p->laddr,
994 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
997 dev->mtu = rt->dst.dev->mtu - addend;
998 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1001 if (dev->mtu < IPV6_MIN_MTU)
1002 dev->mtu = IPV6_MIN_MTU;
1009 static int ip6gre_tnl_change(struct ip6_tnl *t,
1010 const struct __ip6_tnl_parm *p, int set_mtu)
1012 t->parms.laddr = p->laddr;
1013 t->parms.raddr = p->raddr;
1014 t->parms.flags = p->flags;
1015 t->parms.hop_limit = p->hop_limit;
1016 t->parms.encap_limit = p->encap_limit;
1017 t->parms.flowinfo = p->flowinfo;
1018 t->parms.link = p->link;
1019 t->parms.proto = p->proto;
1020 t->parms.i_key = p->i_key;
1021 t->parms.o_key = p->o_key;
1022 t->parms.i_flags = p->i_flags;
1023 t->parms.o_flags = p->o_flags;
1024 dst_cache_reset(&t->dst_cache);
1025 ip6gre_tnl_link_config(t, set_mtu);
1029 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1030 const struct ip6_tnl_parm2 *u)
1032 p->laddr = u->laddr;
1033 p->raddr = u->raddr;
1034 p->flags = u->flags;
1035 p->hop_limit = u->hop_limit;
1036 p->encap_limit = u->encap_limit;
1037 p->flowinfo = u->flowinfo;
1039 p->i_key = u->i_key;
1040 p->o_key = u->o_key;
1041 p->i_flags = u->i_flags;
1042 p->o_flags = u->o_flags;
1043 memcpy(p->name, u->name, sizeof(u->name));
1046 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1047 const struct __ip6_tnl_parm *p)
1049 u->proto = IPPROTO_GRE;
1050 u->laddr = p->laddr;
1051 u->raddr = p->raddr;
1052 u->flags = p->flags;
1053 u->hop_limit = p->hop_limit;
1054 u->encap_limit = p->encap_limit;
1055 u->flowinfo = p->flowinfo;
1057 u->i_key = p->i_key;
1058 u->o_key = p->o_key;
1059 u->i_flags = p->i_flags;
1060 u->o_flags = p->o_flags;
1061 memcpy(u->name, p->name, sizeof(u->name));
1064 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1065 struct ifreq *ifr, int cmd)
1068 struct ip6_tnl_parm2 p;
1069 struct __ip6_tnl_parm p1;
1070 struct ip6_tnl *t = netdev_priv(dev);
1071 struct net *net = t->net;
1072 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1076 if (dev == ign->fb_tunnel_dev) {
1077 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1081 ip6gre_tnl_parm_from_user(&p1, &p);
1082 t = ip6gre_tunnel_locate(net, &p1, 0);
1084 t = netdev_priv(dev);
1086 memset(&p, 0, sizeof(p));
1087 ip6gre_tnl_parm_to_user(&p, &t->parms);
1088 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1095 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1099 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1103 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1106 if (!(p.i_flags&GRE_KEY))
1108 if (!(p.o_flags&GRE_KEY))
1111 ip6gre_tnl_parm_from_user(&p1, &p);
1112 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1114 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1116 if (t->dev != dev) {
1121 t = netdev_priv(dev);
1123 ip6gre_tunnel_unlink(ign, t);
1125 ip6gre_tnl_change(t, &p1, 1);
1126 ip6gre_tunnel_link(ign, t);
1127 netdev_state_change(dev);
1134 memset(&p, 0, sizeof(p));
1135 ip6gre_tnl_parm_to_user(&p, &t->parms);
1136 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1139 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1147 if (dev == ign->fb_tunnel_dev) {
1149 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1152 ip6gre_tnl_parm_from_user(&p1, &p);
1153 t = ip6gre_tunnel_locate(net, &p1, 0);
1157 if (t == netdev_priv(ign->fb_tunnel_dev))
1161 unregister_netdevice(dev);
1173 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1176 new_mtu > 0xFFF8 - dev->hard_header_len)
1182 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1183 unsigned short type, const void *daddr,
1184 const void *saddr, unsigned int len)
1186 struct ip6_tnl *t = netdev_priv(dev);
1187 struct ipv6hdr *ipv6h;
1190 ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen + sizeof(*ipv6h));
1191 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1192 t->fl.u.ip6.flowlabel,
1193 true, &t->fl.u.ip6));
1194 ipv6h->hop_limit = t->parms.hop_limit;
1195 ipv6h->nexthdr = NEXTHDR_GRE;
1196 ipv6h->saddr = t->parms.laddr;
1197 ipv6h->daddr = t->parms.raddr;
1199 p = (__be16 *)(ipv6h + 1);
1200 p[0] = t->parms.o_flags;
1204 * Set the source hardware address.
1208 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1210 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1211 if (!ipv6_addr_any(&ipv6h->daddr))
1217 static const struct header_ops ip6gre_header_ops = {
1218 .create = ip6gre_header,
1221 static const struct net_device_ops ip6gre_netdev_ops = {
1222 .ndo_init = ip6gre_tunnel_init,
1223 .ndo_uninit = ip6gre_tunnel_uninit,
1224 .ndo_start_xmit = ip6gre_tunnel_xmit,
1225 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1226 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1227 .ndo_get_stats64 = ip_tunnel_get_stats64,
1228 .ndo_get_iflink = ip6_tnl_get_iflink,
1231 static void ip6gre_dev_free(struct net_device *dev)
1233 struct ip6_tnl *t = netdev_priv(dev);
1235 dst_cache_destroy(&t->dst_cache);
1236 free_percpu(dev->tstats);
1240 static void ip6gre_tunnel_setup(struct net_device *dev)
1244 dev->netdev_ops = &ip6gre_netdev_ops;
1245 dev->destructor = ip6gre_dev_free;
1247 dev->type = ARPHRD_IP6GRE;
1248 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1249 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1250 t = netdev_priv(dev);
1251 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1253 dev->flags |= IFF_NOARP;
1254 dev->addr_len = sizeof(struct in6_addr);
1255 netif_keep_dst(dev);
1258 static int ip6gre_tunnel_init_common(struct net_device *dev)
1260 struct ip6_tnl *tunnel;
1263 tunnel = netdev_priv(dev);
1266 tunnel->net = dev_net(dev);
1267 strcpy(tunnel->parms.name, dev->name);
1269 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1273 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1275 free_percpu(dev->tstats);
1283 static int ip6gre_tunnel_init(struct net_device *dev)
1285 struct ip6_tnl *tunnel;
1288 ret = ip6gre_tunnel_init_common(dev);
1292 tunnel = netdev_priv(dev);
1294 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1295 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1297 if (ipv6_addr_any(&tunnel->parms.raddr))
1298 dev->header_ops = &ip6gre_header_ops;
1303 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1305 struct ip6_tnl *tunnel = netdev_priv(dev);
1308 tunnel->net = dev_net(dev);
1309 strcpy(tunnel->parms.name, dev->name);
1311 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1315 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1316 .handler = ip6gre_rcv,
1317 .err_handler = ip6gre_err,
1318 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1321 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1323 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1324 struct net_device *dev, *aux;
1327 for_each_netdev_safe(net, dev, aux)
1328 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1329 dev->rtnl_link_ops == &ip6gre_tap_ops)
1330 unregister_netdevice_queue(dev, head);
1332 for (prio = 0; prio < 4; prio++) {
1334 for (h = 0; h < HASH_SIZE; h++) {
1337 t = rtnl_dereference(ign->tunnels[prio][h]);
1340 /* If dev is in the same netns, it has already
1341 * been added to the list by the previous loop.
1343 if (!net_eq(dev_net(t->dev), net))
1344 unregister_netdevice_queue(t->dev,
1346 t = rtnl_dereference(t->next);
1352 static int __net_init ip6gre_init_net(struct net *net)
1354 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1355 struct net_device *ndev;
1358 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1359 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1364 ign->fb_tunnel_dev = ndev;
1365 dev_net_set(ign->fb_tunnel_dev, net);
1366 /* FB netdevice is special: we have one, and only one per netns.
1367 * Allowing to move it to another netns is clearly unsafe.
1369 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1372 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1373 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1375 err = register_netdev(ign->fb_tunnel_dev);
1379 rcu_assign_pointer(ign->tunnels_wc[0],
1380 netdev_priv(ign->fb_tunnel_dev));
1384 ip6gre_dev_free(ndev);
1389 static void __net_exit ip6gre_exit_net(struct net *net)
1394 ip6gre_destroy_tunnels(net, &list);
1395 unregister_netdevice_many(&list);
1399 static struct pernet_operations ip6gre_net_ops = {
1400 .init = ip6gre_init_net,
1401 .exit = ip6gre_exit_net,
1402 .id = &ip6gre_net_id,
1403 .size = sizeof(struct ip6gre_net),
1406 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1414 if (data[IFLA_GRE_IFLAGS])
1415 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1416 if (data[IFLA_GRE_OFLAGS])
1417 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1418 if (flags & (GRE_VERSION|GRE_ROUTING))
1424 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1426 struct in6_addr daddr;
1428 if (tb[IFLA_ADDRESS]) {
1429 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1431 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1432 return -EADDRNOTAVAIL;
1438 if (data[IFLA_GRE_REMOTE]) {
1439 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1440 if (ipv6_addr_any(&daddr))
1445 return ip6gre_tunnel_validate(tb, data);
1449 static void ip6gre_netlink_parms(struct nlattr *data[],
1450 struct __ip6_tnl_parm *parms)
1452 memset(parms, 0, sizeof(*parms));
1457 if (data[IFLA_GRE_LINK])
1458 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1460 if (data[IFLA_GRE_IFLAGS])
1461 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1463 if (data[IFLA_GRE_OFLAGS])
1464 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1466 if (data[IFLA_GRE_IKEY])
1467 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1469 if (data[IFLA_GRE_OKEY])
1470 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1472 if (data[IFLA_GRE_LOCAL])
1473 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1475 if (data[IFLA_GRE_REMOTE])
1476 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1478 if (data[IFLA_GRE_TTL])
1479 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1481 if (data[IFLA_GRE_ENCAP_LIMIT])
1482 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1484 if (data[IFLA_GRE_FLOWINFO])
1485 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1487 if (data[IFLA_GRE_FLAGS])
1488 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1491 static int ip6gre_tap_init(struct net_device *dev)
1493 struct ip6_tnl *tunnel;
1496 ret = ip6gre_tunnel_init_common(dev);
1500 tunnel = netdev_priv(dev);
1502 ip6gre_tnl_link_config(tunnel, 1);
1507 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1508 .ndo_init = ip6gre_tap_init,
1509 .ndo_uninit = ip6gre_tunnel_uninit,
1510 .ndo_start_xmit = ip6gre_tunnel_xmit,
1511 .ndo_set_mac_address = eth_mac_addr,
1512 .ndo_validate_addr = eth_validate_addr,
1513 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1514 .ndo_get_stats64 = ip_tunnel_get_stats64,
1515 .ndo_get_iflink = ip6_tnl_get_iflink,
1518 static void ip6gre_tap_setup(struct net_device *dev)
1523 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1524 dev->destructor = ip6gre_dev_free;
1526 dev->features |= NETIF_F_NETNS_LOCAL;
1529 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1530 struct nlattr *tb[], struct nlattr *data[])
1533 struct net *net = dev_net(dev);
1534 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1537 nt = netdev_priv(dev);
1538 ip6gre_netlink_parms(data, &nt->parms);
1540 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1543 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1544 eth_hw_addr_random(dev);
1547 nt->net = dev_net(dev);
1548 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1550 /* Can use a lockless transmit, unless we generate output sequences */
1551 if (!(nt->parms.o_flags & GRE_SEQ))
1552 dev->features |= NETIF_F_LLTX;
1554 err = register_netdevice(dev);
1559 ip6gre_tunnel_link(ign, nt);
1565 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1566 struct nlattr *data[])
1568 struct ip6_tnl *t, *nt = netdev_priv(dev);
1569 struct net *net = nt->net;
1570 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571 struct __ip6_tnl_parm p;
1573 if (dev == ign->fb_tunnel_dev)
1576 ip6gre_netlink_parms(data, &p);
1578 t = ip6gre_tunnel_locate(net, &p, 0);
1587 ip6gre_tunnel_unlink(ign, t);
1588 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1589 ip6gre_tunnel_link(ign, t);
1593 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1595 struct net *net = dev_net(dev);
1596 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1598 if (dev != ign->fb_tunnel_dev)
1599 unregister_netdevice_queue(dev, head);
1602 static size_t ip6gre_get_size(const struct net_device *dev)
1607 /* IFLA_GRE_IFLAGS */
1609 /* IFLA_GRE_OFLAGS */
1615 /* IFLA_GRE_LOCAL */
1616 nla_total_size(sizeof(struct in6_addr)) +
1617 /* IFLA_GRE_REMOTE */
1618 nla_total_size(sizeof(struct in6_addr)) +
1623 /* IFLA_GRE_ENCAP_LIMIT */
1625 /* IFLA_GRE_FLOWINFO */
1627 /* IFLA_GRE_FLAGS */
1632 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1634 struct ip6_tnl *t = netdev_priv(dev);
1635 struct __ip6_tnl_parm *p = &t->parms;
1637 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1638 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1639 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1640 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1641 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1642 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1643 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1644 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1645 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1646 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1647 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1648 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1649 goto nla_put_failure;
1656 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1657 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1658 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1659 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1660 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1661 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1662 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1663 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1664 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1665 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1666 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1667 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1670 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1672 .maxtype = IFLA_GRE_MAX,
1673 .policy = ip6gre_policy,
1674 .priv_size = sizeof(struct ip6_tnl),
1675 .setup = ip6gre_tunnel_setup,
1676 .validate = ip6gre_tunnel_validate,
1677 .newlink = ip6gre_newlink,
1678 .changelink = ip6gre_changelink,
1679 .dellink = ip6gre_dellink,
1680 .get_size = ip6gre_get_size,
1681 .fill_info = ip6gre_fill_info,
1682 .get_link_net = ip6_tnl_get_link_net,
1685 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1686 .kind = "ip6gretap",
1687 .maxtype = IFLA_GRE_MAX,
1688 .policy = ip6gre_policy,
1689 .priv_size = sizeof(struct ip6_tnl),
1690 .setup = ip6gre_tap_setup,
1691 .validate = ip6gre_tap_validate,
1692 .newlink = ip6gre_newlink,
1693 .changelink = ip6gre_changelink,
1694 .get_size = ip6gre_get_size,
1695 .fill_info = ip6gre_fill_info,
1696 .get_link_net = ip6_tnl_get_link_net,
1700 * And now the modules code and kernel interface.
1703 static int __init ip6gre_init(void)
1707 pr_info("GRE over IPv6 tunneling driver\n");
1709 err = register_pernet_device(&ip6gre_net_ops);
1713 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1715 pr_info("%s: can't add protocol\n", __func__);
1716 goto add_proto_failed;
1719 err = rtnl_link_register(&ip6gre_link_ops);
1721 goto rtnl_link_failed;
1723 err = rtnl_link_register(&ip6gre_tap_ops);
1725 goto tap_ops_failed;
1731 rtnl_link_unregister(&ip6gre_link_ops);
1733 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1735 unregister_pernet_device(&ip6gre_net_ops);
1739 static void __exit ip6gre_fini(void)
1741 rtnl_link_unregister(&ip6gre_tap_ops);
1742 rtnl_link_unregister(&ip6gre_link_ops);
1743 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1744 unregister_pernet_device(&ip6gre_net_ops);
1747 module_init(ip6gre_init);
1748 module_exit(ip6gre_fini);
1749 MODULE_LICENSE("GPL");
1750 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1751 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1752 MODULE_ALIAS_RTNL_LINK("ip6gre");
1753 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1754 MODULE_ALIAS_NETDEV("ip6gre0");