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>
42 #include <net/protocol.h>
43 #include <net/addrconf.h>
45 #include <net/checksum.h>
46 #include <net/dsfield.h>
47 #include <net/inet_ecn.h>
49 #include <net/net_namespace.h>
50 #include <net/netns/generic.h>
51 #include <net/rtnetlink.h>
54 #include <net/ip6_fib.h>
55 #include <net/ip6_route.h>
56 #include <net/ip6_tunnel.h>
59 static bool log_ecn_error = true;
60 module_param(log_ecn_error, bool, 0644);
61 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
64 #define IPV6_TCLASS_SHIFT 20
66 #define HASH_SIZE_SHIFT 5
67 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
69 static int ip6gre_net_id __read_mostly;
71 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
73 struct net_device *fb_tunnel_dev;
76 static struct rtnl_link_ops ip6gre_link_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 static struct rtnl_link_stats64 *ip6gre_get_stats64(struct net_device *dev,
114 struct rtnl_link_stats64 *tot)
118 for_each_possible_cpu(i) {
119 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
120 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
124 start = u64_stats_fetch_begin_bh(&tstats->syncp);
125 rx_packets = tstats->rx_packets;
126 tx_packets = tstats->tx_packets;
127 rx_bytes = tstats->rx_bytes;
128 tx_bytes = tstats->tx_bytes;
129 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
131 tot->rx_packets += rx_packets;
132 tot->tx_packets += tx_packets;
133 tot->rx_bytes += rx_bytes;
134 tot->tx_bytes += tx_bytes;
137 tot->multicast = dev->stats.multicast;
138 tot->rx_crc_errors = dev->stats.rx_crc_errors;
139 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
140 tot->rx_length_errors = dev->stats.rx_length_errors;
141 tot->rx_frame_errors = dev->stats.rx_frame_errors;
142 tot->rx_errors = dev->stats.rx_errors;
144 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
145 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
146 tot->tx_dropped = dev->stats.tx_dropped;
147 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
148 tot->tx_errors = dev->stats.tx_errors;
153 /* Given src, dst and key, find appropriate for input tunnel. */
155 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
156 const struct in6_addr *remote, const struct in6_addr *local,
157 __be32 key, __be16 gre_proto)
159 struct net *net = dev_net(dev);
160 int link = dev->ifindex;
161 unsigned int h0 = HASH_ADDR(remote);
162 unsigned int h1 = HASH_KEY(key);
163 struct ip6_tnl *t, *cand = NULL;
164 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
165 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
166 ARPHRD_ETHER : ARPHRD_IP6GRE;
167 int score, cand_score = 4;
169 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
170 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
171 !ipv6_addr_equal(remote, &t->parms.raddr) ||
172 key != t->parms.i_key ||
173 !(t->dev->flags & IFF_UP))
176 if (t->dev->type != ARPHRD_IP6GRE &&
177 t->dev->type != dev_type)
181 if (t->parms.link != link)
183 if (t->dev->type != dev_type)
188 if (score < cand_score) {
194 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
195 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
196 key != t->parms.i_key ||
197 !(t->dev->flags & IFF_UP))
200 if (t->dev->type != ARPHRD_IP6GRE &&
201 t->dev->type != dev_type)
205 if (t->parms.link != link)
207 if (t->dev->type != dev_type)
212 if (score < cand_score) {
218 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
219 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
220 (!ipv6_addr_equal(local, &t->parms.raddr) ||
221 !ipv6_addr_is_multicast(local))) ||
222 key != t->parms.i_key ||
223 !(t->dev->flags & IFF_UP))
226 if (t->dev->type != ARPHRD_IP6GRE &&
227 t->dev->type != dev_type)
231 if (t->parms.link != link)
233 if (t->dev->type != dev_type)
238 if (score < cand_score) {
244 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
245 if (t->parms.i_key != key ||
246 !(t->dev->flags & IFF_UP))
249 if (t->dev->type != ARPHRD_IP6GRE &&
250 t->dev->type != dev_type)
254 if (t->parms.link != link)
256 if (t->dev->type != dev_type)
261 if (score < cand_score) {
270 dev = ign->fb_tunnel_dev;
271 if (dev->flags & IFF_UP)
272 return netdev_priv(dev);
277 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
278 const struct __ip6_tnl_parm *p)
280 const struct in6_addr *remote = &p->raddr;
281 const struct in6_addr *local = &p->laddr;
282 unsigned int h = HASH_KEY(p->i_key);
285 if (!ipv6_addr_any(local))
287 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
289 h ^= HASH_ADDR(remote);
292 return &ign->tunnels[prio][h];
295 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
296 const struct ip6_tnl *t)
298 return __ip6gre_bucket(ign, &t->parms);
301 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
303 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
305 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
306 rcu_assign_pointer(*tp, t);
309 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
311 struct ip6_tnl __rcu **tp;
312 struct ip6_tnl *iter;
314 for (tp = ip6gre_bucket(ign, t);
315 (iter = rtnl_dereference(*tp)) != NULL;
318 rcu_assign_pointer(*tp, t->next);
324 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
325 const struct __ip6_tnl_parm *parms,
328 const struct in6_addr *remote = &parms->raddr;
329 const struct in6_addr *local = &parms->laddr;
330 __be32 key = parms->i_key;
331 int link = parms->link;
333 struct ip6_tnl __rcu **tp;
334 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
336 for (tp = __ip6gre_bucket(ign, parms);
337 (t = rtnl_dereference(*tp)) != NULL;
339 if (ipv6_addr_equal(local, &t->parms.laddr) &&
340 ipv6_addr_equal(remote, &t->parms.raddr) &&
341 key == t->parms.i_key &&
342 link == t->parms.link &&
343 type == t->dev->type)
349 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
350 const struct __ip6_tnl_parm *parms, int create)
352 struct ip6_tnl *t, *nt;
353 struct net_device *dev;
355 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
357 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
362 strlcpy(name, parms->name, IFNAMSIZ);
364 strcpy(name, "ip6gre%d");
366 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
370 dev_net_set(dev, net);
372 nt = netdev_priv(dev);
374 dev->rtnl_link_ops = &ip6gre_link_ops;
377 ip6gre_tnl_link_config(nt, 1);
379 if (register_netdevice(dev) < 0)
382 /* Can use a lockless transmit, unless we generate output sequences */
383 if (!(nt->parms.o_flags & GRE_SEQ))
384 dev->features |= NETIF_F_LLTX;
387 ip6gre_tunnel_link(ign, nt);
395 static void ip6gre_tunnel_uninit(struct net_device *dev)
397 struct net *net = dev_net(dev);
398 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
400 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
405 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
406 u8 type, u8 code, int offset, __be32 info)
408 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
409 __be16 *p = (__be16 *)(skb->data + offset);
410 int grehlen = offset + 4;
415 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
416 if (flags&(GRE_VERSION|GRE_ROUTING))
425 /* If only 8 bytes returned, keyed message will be dropped here */
426 if (!pskb_may_pull(skb, grehlen))
428 ipv6h = (const struct ipv6hdr *)skb->data;
429 p = (__be16 *)(skb->data + offset);
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
433 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
440 struct ipv6_tlv_tnl_enc_lim *tel;
442 case ICMPV6_DEST_UNREACH:
443 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
446 case ICMPV6_TIME_EXCEED:
447 if (code == ICMPV6_EXC_HOPLIMIT) {
448 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
452 case ICMPV6_PARAMPROB:
454 if (code == ICMPV6_HDR_FIELD)
455 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
457 if (teli && teli == info - 2) {
458 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
459 if (tel->encap_limit == 0) {
460 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
464 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
468 case ICMPV6_PKT_TOOBIG:
470 if (mtu < IPV6_MIN_MTU)
476 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
480 t->err_time = jiffies;
483 static int ip6gre_rcv(struct sk_buff *skb)
485 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
496 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
499 ipv6h = ipv6_hdr(skb);
501 flags = *(__be16 *)h;
503 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
504 /* - Version must be 0.
505 - We do not support routing headers.
507 if (flags&(GRE_VERSION|GRE_ROUTING))
510 if (flags&GRE_CSUM) {
511 switch (skb->ip_summed) {
512 case CHECKSUM_COMPLETE:
513 csum = csum_fold(skb->csum);
519 csum = __skb_checksum_complete(skb);
520 skb->ip_summed = CHECKSUM_COMPLETE;
525 key = *(__be32 *)(h + offset);
529 seqno = ntohl(*(__be32 *)(h + offset));
534 gre_proto = *(__be16 *)(h + 2);
536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, key,
540 struct pcpu_tstats *tstats;
542 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
545 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
546 tunnel->dev->stats.rx_dropped++;
552 skb->protocol = gre_proto;
553 /* WCCP version 1 and 2 protocol decoding.
554 * - Change protocol to IP
555 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
557 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
558 skb->protocol = htons(ETH_P_IP);
559 if ((*(h + offset) & 0xF0) != 0x40)
563 skb->mac_header = skb->network_header;
564 __pskb_pull(skb, offset);
565 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
566 skb->pkt_type = PACKET_HOST;
568 if (((flags&GRE_CSUM) && csum) ||
569 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
570 tunnel->dev->stats.rx_crc_errors++;
571 tunnel->dev->stats.rx_errors++;
574 if (tunnel->parms.i_flags&GRE_SEQ) {
575 if (!(flags&GRE_SEQ) ||
577 (s32)(seqno - tunnel->i_seqno) < 0)) {
578 tunnel->dev->stats.rx_fifo_errors++;
579 tunnel->dev->stats.rx_errors++;
582 tunnel->i_seqno = seqno + 1;
585 /* Warning: All skb pointers will be invalidated! */
586 if (tunnel->dev->type == ARPHRD_ETHER) {
587 if (!pskb_may_pull(skb, ETH_HLEN)) {
588 tunnel->dev->stats.rx_length_errors++;
589 tunnel->dev->stats.rx_errors++;
593 ipv6h = ipv6_hdr(skb);
594 skb->protocol = eth_type_trans(skb, tunnel->dev);
595 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
598 __skb_tunnel_rx(skb, tunnel->dev);
600 skb_reset_network_header(skb);
602 err = IP6_ECN_decapsulate(ipv6h, skb);
605 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
607 ipv6_get_dsfield(ipv6h));
609 ++tunnel->dev->stats.rx_frame_errors;
610 ++tunnel->dev->stats.rx_errors;
615 tstats = this_cpu_ptr(tunnel->dev->tstats);
616 u64_stats_update_begin(&tstats->syncp);
617 tstats->rx_packets++;
618 tstats->rx_bytes += skb->len;
619 u64_stats_update_end(&tstats->syncp);
625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
632 struct ipv6_tel_txoption {
633 struct ipv6_txoptions ops;
637 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
639 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
641 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
643 opt->dst_opt[4] = encap_limit;
644 opt->dst_opt[5] = IPV6_TLV_PADN;
647 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
648 opt->ops.opt_nflen = 8;
651 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
652 struct net_device *dev,
658 struct net *net = dev_net(dev);
659 struct ip6_tnl *tunnel = netdev_priv(dev);
660 struct net_device *tdev; /* Device to other host */
661 struct ipv6hdr *ipv6h; /* Our new IP header */
662 unsigned int max_headroom; /* The extra header space needed */
664 struct ipv6_tel_txoption opt;
666 struct dst_entry *dst = NULL, *ndst = NULL;
667 struct net_device_stats *stats = &tunnel->dev->stats;
670 struct sk_buff *new_skb;
672 if (dev->type == ARPHRD_ETHER)
673 IPCB(skb)->flags = 0;
675 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
677 ipv6h = (struct ipv6hdr *)skb->data;
678 fl6->daddr = ipv6h->daddr;
680 gre_hlen = tunnel->hlen;
681 fl6->daddr = tunnel->parms.raddr;
684 if (!fl6->flowi6_mark)
685 dst = ip6_tnl_dst_check(tunnel);
688 ndst = ip6_route_output(net, NULL, fl6);
691 goto tx_err_link_failure;
692 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
696 goto tx_err_link_failure;
705 net_warn_ratelimited("%s: Local routing loop detected!\n",
707 goto tx_err_dst_release;
710 mtu = dst_mtu(dst) - sizeof(*ipv6h);
711 if (encap_limit >= 0) {
715 if (mtu < IPV6_MIN_MTU)
718 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
719 if (skb->len > mtu) {
722 goto tx_err_dst_release;
725 if (tunnel->err_count > 0) {
726 if (time_before(jiffies,
727 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
730 dst_link_failure(skb);
732 tunnel->err_count = 0;
735 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
737 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
738 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
739 new_skb = skb_realloc_headroom(skb, max_headroom);
740 if (max_headroom > dev->needed_headroom)
741 dev->needed_headroom = max_headroom;
743 goto tx_err_dst_release;
746 skb_set_owner_w(new_skb, skb->sk);
753 if (fl6->flowi6_mark) {
754 skb_dst_set(skb, dst);
757 skb_dst_set_noref(skb, dst);
761 if (encap_limit >= 0) {
762 init_tel_txopt(&opt, encap_limit);
763 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
766 skb_push(skb, gre_hlen);
767 skb_reset_network_header(skb);
768 skb_set_transport_header(skb, sizeof(*ipv6h));
771 * Push down and install the IP header.
773 ipv6h = ipv6_hdr(skb);
774 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
775 ipv6h->hop_limit = tunnel->parms.hop_limit;
776 ipv6h->nexthdr = proto;
777 ipv6h->saddr = fl6->saddr;
778 ipv6h->daddr = fl6->daddr;
780 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
781 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
782 htons(ETH_P_TEB) : skb->protocol;
784 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
785 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
787 if (tunnel->parms.o_flags&GRE_SEQ) {
789 *ptr = htonl(tunnel->o_seqno);
792 if (tunnel->parms.o_flags&GRE_KEY) {
793 *ptr = tunnel->parms.o_key;
796 if (tunnel->parms.o_flags&GRE_CSUM) {
798 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
799 skb->len - sizeof(struct ipv6hdr));
803 ip6tunnel_xmit(skb, dev);
805 ip6_tnl_dst_store(tunnel, ndst);
808 stats->tx_carrier_errors++;
809 dst_link_failure(skb);
815 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
817 struct ip6_tnl *t = netdev_priv(dev);
818 const struct iphdr *iph = ip_hdr(skb);
819 int encap_limit = -1;
825 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
826 encap_limit = t->parms.encap_limit;
828 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
829 fl6.flowi6_proto = IPPROTO_IPIP;
831 dsfield = ipv4_get_dsfield(iph);
833 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
834 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
836 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
837 fl6.flowi6_mark = skb->mark;
839 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
841 /* XXX: send ICMP error even if DF is not set. */
842 if (err == -EMSGSIZE)
843 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
851 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
853 struct ip6_tnl *t = netdev_priv(dev);
854 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
855 int encap_limit = -1;
862 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
865 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
867 struct ipv6_tlv_tnl_enc_lim *tel;
868 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
869 if (tel->encap_limit == 0) {
870 icmpv6_send(skb, ICMPV6_PARAMPROB,
871 ICMPV6_HDR_FIELD, offset + 2);
874 encap_limit = tel->encap_limit - 1;
875 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
876 encap_limit = t->parms.encap_limit;
878 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
879 fl6.flowi6_proto = IPPROTO_IPV6;
881 dsfield = ipv6_get_dsfield(ipv6h);
882 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
883 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
884 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
885 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
886 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
887 fl6.flowi6_mark = skb->mark;
889 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
891 if (err == -EMSGSIZE)
892 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
900 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
901 * @t: the outgoing tunnel device
902 * @hdr: IPv6 header from the incoming packet
905 * Avoid trivial tunneling loop by checking that tunnel exit-point
906 * doesn't match source of incoming packet.
913 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
914 const struct ipv6hdr *hdr)
916 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
919 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
921 struct ip6_tnl *t = netdev_priv(dev);
922 int encap_limit = -1;
927 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
928 encap_limit = t->parms.encap_limit;
930 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
931 fl6.flowi6_proto = skb->protocol;
933 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
938 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
939 struct net_device *dev)
941 struct ip6_tnl *t = netdev_priv(dev);
942 struct net_device_stats *stats = &t->dev->stats;
945 if (!ip6_tnl_xmit_ctl(t))
948 switch (skb->protocol) {
949 case htons(ETH_P_IP):
950 ret = ip6gre_xmit_ipv4(skb, dev);
952 case htons(ETH_P_IPV6):
953 ret = ip6gre_xmit_ipv6(skb, dev);
956 ret = ip6gre_xmit_other(skb, dev);
972 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
974 struct net_device *dev = t->dev;
975 struct __ip6_tnl_parm *p = &t->parms;
976 struct flowi6 *fl6 = &t->fl.u.ip6;
977 int addend = sizeof(struct ipv6hdr) + 4;
979 if (dev->type != ARPHRD_ETHER) {
980 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
981 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
984 /* Set up flowi template */
985 fl6->saddr = p->laddr;
986 fl6->daddr = p->raddr;
987 fl6->flowi6_oif = p->link;
990 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
991 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
992 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
993 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
995 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
996 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
998 if (p->flags&IP6_TNL_F_CAP_XMIT &&
999 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1000 dev->flags |= IFF_POINTOPOINT;
1002 dev->flags &= ~IFF_POINTOPOINT;
1004 dev->iflink = p->link;
1006 /* Precalculate GRE options length */
1007 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
1008 if (t->parms.o_flags&GRE_CSUM)
1010 if (t->parms.o_flags&GRE_KEY)
1012 if (t->parms.o_flags&GRE_SEQ)
1016 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1017 int strict = (ipv6_addr_type(&p->raddr) &
1018 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1020 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1021 &p->raddr, &p->laddr,
1028 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
1031 dev->mtu = rt->dst.dev->mtu - addend;
1032 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1035 if (dev->mtu < IPV6_MIN_MTU)
1036 dev->mtu = IPV6_MIN_MTU;
1045 static int ip6gre_tnl_change(struct ip6_tnl *t,
1046 const struct __ip6_tnl_parm *p, int set_mtu)
1048 t->parms.laddr = p->laddr;
1049 t->parms.raddr = p->raddr;
1050 t->parms.flags = p->flags;
1051 t->parms.hop_limit = p->hop_limit;
1052 t->parms.encap_limit = p->encap_limit;
1053 t->parms.flowinfo = p->flowinfo;
1054 t->parms.link = p->link;
1055 t->parms.proto = p->proto;
1056 t->parms.i_key = p->i_key;
1057 t->parms.o_key = p->o_key;
1058 t->parms.i_flags = p->i_flags;
1059 t->parms.o_flags = p->o_flags;
1060 ip6_tnl_dst_reset(t);
1061 ip6gre_tnl_link_config(t, set_mtu);
1065 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1066 const struct ip6_tnl_parm2 *u)
1068 p->laddr = u->laddr;
1069 p->raddr = u->raddr;
1070 p->flags = u->flags;
1071 p->hop_limit = u->hop_limit;
1072 p->encap_limit = u->encap_limit;
1073 p->flowinfo = u->flowinfo;
1075 p->i_key = u->i_key;
1076 p->o_key = u->o_key;
1077 p->i_flags = u->i_flags;
1078 p->o_flags = u->o_flags;
1079 memcpy(p->name, u->name, sizeof(u->name));
1082 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1083 const struct __ip6_tnl_parm *p)
1085 u->proto = IPPROTO_GRE;
1086 u->laddr = p->laddr;
1087 u->raddr = p->raddr;
1088 u->flags = p->flags;
1089 u->hop_limit = p->hop_limit;
1090 u->encap_limit = p->encap_limit;
1091 u->flowinfo = p->flowinfo;
1093 u->i_key = p->i_key;
1094 u->o_key = p->o_key;
1095 u->i_flags = p->i_flags;
1096 u->o_flags = p->o_flags;
1097 memcpy(u->name, p->name, sizeof(u->name));
1100 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1101 struct ifreq *ifr, int cmd)
1104 struct ip6_tnl_parm2 p;
1105 struct __ip6_tnl_parm p1;
1107 struct net *net = dev_net(dev);
1108 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1113 if (dev == ign->fb_tunnel_dev) {
1114 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1118 ip6gre_tnl_parm_from_user(&p1, &p);
1119 t = ip6gre_tunnel_locate(net, &p1, 0);
1122 t = netdev_priv(dev);
1123 ip6gre_tnl_parm_to_user(&p, &t->parms);
1124 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1131 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1135 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1139 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1142 if (!(p.i_flags&GRE_KEY))
1144 if (!(p.o_flags&GRE_KEY))
1147 ip6gre_tnl_parm_from_user(&p1, &p);
1148 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1150 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1152 if (t->dev != dev) {
1157 t = netdev_priv(dev);
1159 ip6gre_tunnel_unlink(ign, t);
1161 ip6gre_tnl_change(t, &p1, 1);
1162 ip6gre_tunnel_link(ign, t);
1163 netdev_state_change(dev);
1170 ip6gre_tnl_parm_to_user(&p, &t->parms);
1171 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1174 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1179 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1182 if (dev == ign->fb_tunnel_dev) {
1184 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1187 ip6gre_tnl_parm_from_user(&p1, &p);
1188 t = ip6gre_tunnel_locate(net, &p1, 0);
1192 if (t == netdev_priv(ign->fb_tunnel_dev))
1196 unregister_netdevice(dev);
1208 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1210 struct ip6_tnl *tunnel = netdev_priv(dev);
1212 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1218 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1219 unsigned short type,
1220 const void *daddr, const void *saddr, unsigned int len)
1222 struct ip6_tnl *t = netdev_priv(dev);
1223 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1224 __be16 *p = (__be16 *)(ipv6h+1);
1226 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1227 ipv6h->hop_limit = t->parms.hop_limit;
1228 ipv6h->nexthdr = NEXTHDR_GRE;
1229 ipv6h->saddr = t->parms.laddr;
1230 ipv6h->daddr = t->parms.raddr;
1232 p[0] = t->parms.o_flags;
1236 * Set the source hardware address.
1240 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1242 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1243 if (!ipv6_addr_any(&ipv6h->daddr))
1249 static const struct header_ops ip6gre_header_ops = {
1250 .create = ip6gre_header,
1253 static const struct net_device_ops ip6gre_netdev_ops = {
1254 .ndo_init = ip6gre_tunnel_init,
1255 .ndo_uninit = ip6gre_tunnel_uninit,
1256 .ndo_start_xmit = ip6gre_tunnel_xmit,
1257 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1258 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1259 .ndo_get_stats64 = ip6gre_get_stats64,
1262 static void ip6gre_dev_free(struct net_device *dev)
1264 free_percpu(dev->tstats);
1268 static void ip6gre_tunnel_setup(struct net_device *dev)
1272 dev->netdev_ops = &ip6gre_netdev_ops;
1273 dev->destructor = ip6gre_dev_free;
1275 dev->type = ARPHRD_IP6GRE;
1276 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1277 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1278 t = netdev_priv(dev);
1279 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1281 dev->flags |= IFF_NOARP;
1283 dev->addr_len = sizeof(struct in6_addr);
1284 dev->features |= NETIF_F_NETNS_LOCAL;
1285 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1288 static int ip6gre_tunnel_init(struct net_device *dev)
1290 struct ip6_tnl *tunnel;
1292 tunnel = netdev_priv(dev);
1295 strcpy(tunnel->parms.name, dev->name);
1297 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1298 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1300 if (ipv6_addr_any(&tunnel->parms.raddr))
1301 dev->header_ops = &ip6gre_header_ops;
1303 dev->tstats = alloc_percpu(struct pcpu_tstats);
1310 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1312 struct ip6_tnl *tunnel = netdev_priv(dev);
1315 strcpy(tunnel->parms.name, dev->name);
1317 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1323 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1324 .handler = ip6gre_rcv,
1325 .err_handler = ip6gre_err,
1326 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1329 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1330 struct list_head *head)
1334 for (prio = 0; prio < 4; prio++) {
1336 for (h = 0; h < HASH_SIZE; h++) {
1339 t = rtnl_dereference(ign->tunnels[prio][h]);
1342 unregister_netdevice_queue(t->dev, head);
1343 t = rtnl_dereference(t->next);
1349 static int __net_init ip6gre_init_net(struct net *net)
1351 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1354 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1355 ip6gre_tunnel_setup);
1356 if (!ign->fb_tunnel_dev) {
1360 dev_net_set(ign->fb_tunnel_dev, net);
1362 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1363 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1365 err = register_netdev(ign->fb_tunnel_dev);
1369 rcu_assign_pointer(ign->tunnels_wc[0],
1370 netdev_priv(ign->fb_tunnel_dev));
1374 ip6gre_dev_free(ign->fb_tunnel_dev);
1379 static void __net_exit ip6gre_exit_net(struct net *net)
1381 struct ip6gre_net *ign;
1384 ign = net_generic(net, ip6gre_net_id);
1386 ip6gre_destroy_tunnels(ign, &list);
1387 unregister_netdevice_many(&list);
1391 static struct pernet_operations ip6gre_net_ops = {
1392 .init = ip6gre_init_net,
1393 .exit = ip6gre_exit_net,
1394 .id = &ip6gre_net_id,
1395 .size = sizeof(struct ip6gre_net),
1398 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1406 if (data[IFLA_GRE_IFLAGS])
1407 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1408 if (data[IFLA_GRE_OFLAGS])
1409 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1410 if (flags & (GRE_VERSION|GRE_ROUTING))
1416 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1418 struct in6_addr daddr;
1420 if (tb[IFLA_ADDRESS]) {
1421 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1423 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1424 return -EADDRNOTAVAIL;
1430 if (data[IFLA_GRE_REMOTE]) {
1431 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1432 if (ipv6_addr_any(&daddr))
1437 return ip6gre_tunnel_validate(tb, data);
1441 static void ip6gre_netlink_parms(struct nlattr *data[],
1442 struct __ip6_tnl_parm *parms)
1444 memset(parms, 0, sizeof(*parms));
1449 if (data[IFLA_GRE_LINK])
1450 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1452 if (data[IFLA_GRE_IFLAGS])
1453 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1455 if (data[IFLA_GRE_OFLAGS])
1456 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1458 if (data[IFLA_GRE_IKEY])
1459 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1461 if (data[IFLA_GRE_OKEY])
1462 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1464 if (data[IFLA_GRE_LOCAL])
1465 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1467 if (data[IFLA_GRE_REMOTE])
1468 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1470 if (data[IFLA_GRE_TTL])
1471 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1473 if (data[IFLA_GRE_ENCAP_LIMIT])
1474 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1476 if (data[IFLA_GRE_FLOWINFO])
1477 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1479 if (data[IFLA_GRE_FLAGS])
1480 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1483 static int ip6gre_tap_init(struct net_device *dev)
1485 struct ip6_tnl *tunnel;
1487 tunnel = netdev_priv(dev);
1490 strcpy(tunnel->parms.name, dev->name);
1492 ip6gre_tnl_link_config(tunnel, 1);
1494 dev->tstats = alloc_percpu(struct pcpu_tstats);
1501 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1502 .ndo_init = ip6gre_tap_init,
1503 .ndo_uninit = ip6gre_tunnel_uninit,
1504 .ndo_start_xmit = ip6gre_tunnel_xmit,
1505 .ndo_set_mac_address = eth_mac_addr,
1506 .ndo_validate_addr = eth_validate_addr,
1507 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1508 .ndo_get_stats64 = ip6gre_get_stats64,
1511 static void ip6gre_tap_setup(struct net_device *dev)
1516 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1517 dev->destructor = ip6gre_dev_free;
1520 dev->features |= NETIF_F_NETNS_LOCAL;
1523 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1524 struct nlattr *tb[], struct nlattr *data[])
1527 struct net *net = dev_net(dev);
1528 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1531 nt = netdev_priv(dev);
1532 ip6gre_netlink_parms(data, &nt->parms);
1534 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1537 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1538 eth_hw_addr_random(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;
1562 struct net *net = dev_net(dev);
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 nt = netdev_priv(dev);
1570 ip6gre_netlink_parms(data, &p);
1572 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);
1583 netdev_state_change(dev);
1589 static size_t ip6gre_get_size(const struct net_device *dev)
1594 /* IFLA_GRE_IFLAGS */
1596 /* IFLA_GRE_OFLAGS */
1602 /* IFLA_GRE_LOCAL */
1603 nla_total_size(sizeof(struct in6_addr)) +
1604 /* IFLA_GRE_REMOTE */
1605 nla_total_size(sizeof(struct in6_addr)) +
1610 /* IFLA_GRE_ENCAP_LIMIT */
1612 /* IFLA_GRE_FLOWINFO */
1614 /* IFLA_GRE_FLAGS */
1619 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1621 struct ip6_tnl *t = netdev_priv(dev);
1622 struct __ip6_tnl_parm *p = &t->parms;
1624 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1625 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1626 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1627 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1628 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1629 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1630 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1631 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1632 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1633 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1634 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1635 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1636 goto nla_put_failure;
1643 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1644 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1645 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1646 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1647 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1648 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1649 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1650 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1651 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1652 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1653 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1654 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1657 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1659 .maxtype = IFLA_GRE_MAX,
1660 .policy = ip6gre_policy,
1661 .priv_size = sizeof(struct ip6_tnl),
1662 .setup = ip6gre_tunnel_setup,
1663 .validate = ip6gre_tunnel_validate,
1664 .newlink = ip6gre_newlink,
1665 .changelink = ip6gre_changelink,
1666 .get_size = ip6gre_get_size,
1667 .fill_info = ip6gre_fill_info,
1670 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1671 .kind = "ip6gretap",
1672 .maxtype = IFLA_GRE_MAX,
1673 .policy = ip6gre_policy,
1674 .priv_size = sizeof(struct ip6_tnl),
1675 .setup = ip6gre_tap_setup,
1676 .validate = ip6gre_tap_validate,
1677 .newlink = ip6gre_newlink,
1678 .changelink = ip6gre_changelink,
1679 .get_size = ip6gre_get_size,
1680 .fill_info = ip6gre_fill_info,
1684 * And now the modules code and kernel interface.
1687 static int __init ip6gre_init(void)
1691 pr_info("GRE over IPv6 tunneling driver\n");
1693 err = register_pernet_device(&ip6gre_net_ops);
1697 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1699 pr_info("%s: can't add protocol\n", __func__);
1700 goto add_proto_failed;
1703 err = rtnl_link_register(&ip6gre_link_ops);
1705 goto rtnl_link_failed;
1707 err = rtnl_link_register(&ip6gre_tap_ops);
1709 goto tap_ops_failed;
1715 rtnl_link_unregister(&ip6gre_link_ops);
1717 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1719 unregister_pernet_device(&ip6gre_net_ops);
1723 static void __exit ip6gre_fini(void)
1725 rtnl_link_unregister(&ip6gre_tap_ops);
1726 rtnl_link_unregister(&ip6gre_link_ops);
1727 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1728 unregister_pernet_device(&ip6gre_net_ops);
1731 module_init(ip6gre_init);
1732 module_exit(ip6gre_fini);
1733 MODULE_LICENSE("GPL");
1734 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1735 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1736 MODULE_ALIAS_RTNL_LINK("ip6gre");
1737 MODULE_ALIAS_NETDEV("ip6gre0");