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/init.h>
28 #include <linux/in6.h>
29 #include <linux/inetdevice.h>
30 #include <linux/igmp.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/hash.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
40 #include <net/ip_tunnels.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>
58 #include <net/erspan.h>
59 #include <net/dst_metadata.h>
62 static bool log_ecn_error = true;
63 module_param(log_ecn_error, bool, 0644);
64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
66 #define IP6_GRE_HASH_SIZE_SHIFT 5
67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
69 static unsigned int ip6gre_net_id __read_mostly;
71 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
73 struct ip6_tnl __rcu *collect_md_tun;
74 struct ip6_tnl __rcu *collect_md_tun_erspan;
75 struct net_device *fb_tunnel_dev;
78 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
79 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
80 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
81 static int ip6gre_tunnel_init(struct net_device *dev);
82 static void ip6gre_tunnel_setup(struct net_device *dev);
83 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
84 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
85 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
87 /* Tunnel hash table */
97 We require exact key match i.e. if a key is present in packet
98 it will match only tunnel with the same key; if it is not present,
99 it will match only keyless tunnel.
101 All keysless packets, if not matched configured keyless tunnels
102 will match fallback tunnel.
105 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
106 static u32 HASH_ADDR(const struct in6_addr *addr)
108 u32 hash = ipv6_addr_hash(addr);
110 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
113 #define tunnels_r_l tunnels[3]
114 #define tunnels_r tunnels[2]
115 #define tunnels_l tunnels[1]
116 #define tunnels_wc tunnels[0]
118 /* Given src, dst and key, find appropriate for input tunnel. */
120 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
121 const struct in6_addr *remote, const struct in6_addr *local,
122 __be32 key, __be16 gre_proto)
124 struct net *net = dev_net(dev);
125 int link = dev->ifindex;
126 unsigned int h0 = HASH_ADDR(remote);
127 unsigned int h1 = HASH_KEY(key);
128 struct ip6_tnl *t, *cand = NULL;
129 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
130 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
131 gre_proto == htons(ETH_P_ERSPAN) ||
132 gre_proto == htons(ETH_P_ERSPAN2)) ?
133 ARPHRD_ETHER : ARPHRD_IP6GRE;
134 int score, cand_score = 4;
136 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
137 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138 !ipv6_addr_equal(remote, &t->parms.raddr) ||
139 key != t->parms.i_key ||
140 !(t->dev->flags & IFF_UP))
143 if (t->dev->type != ARPHRD_IP6GRE &&
144 t->dev->type != dev_type)
148 if (t->parms.link != link)
150 if (t->dev->type != dev_type)
155 if (score < cand_score) {
161 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
162 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
163 key != t->parms.i_key ||
164 !(t->dev->flags & IFF_UP))
167 if (t->dev->type != ARPHRD_IP6GRE &&
168 t->dev->type != dev_type)
172 if (t->parms.link != link)
174 if (t->dev->type != dev_type)
179 if (score < cand_score) {
185 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
186 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
187 (!ipv6_addr_equal(local, &t->parms.raddr) ||
188 !ipv6_addr_is_multicast(local))) ||
189 key != t->parms.i_key ||
190 !(t->dev->flags & IFF_UP))
193 if (t->dev->type != ARPHRD_IP6GRE &&
194 t->dev->type != dev_type)
198 if (t->parms.link != link)
200 if (t->dev->type != dev_type)
205 if (score < cand_score) {
211 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
212 if (t->parms.i_key != key ||
213 !(t->dev->flags & IFF_UP))
216 if (t->dev->type != ARPHRD_IP6GRE &&
217 t->dev->type != dev_type)
221 if (t->parms.link != link)
223 if (t->dev->type != dev_type)
228 if (score < cand_score) {
237 if (gre_proto == htons(ETH_P_ERSPAN) ||
238 gre_proto == htons(ETH_P_ERSPAN2))
239 t = rcu_dereference(ign->collect_md_tun_erspan);
241 t = rcu_dereference(ign->collect_md_tun);
243 if (t && t->dev->flags & IFF_UP)
246 dev = ign->fb_tunnel_dev;
247 if (dev && dev->flags & IFF_UP)
248 return netdev_priv(dev);
253 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
254 const struct __ip6_tnl_parm *p)
256 const struct in6_addr *remote = &p->raddr;
257 const struct in6_addr *local = &p->laddr;
258 unsigned int h = HASH_KEY(p->i_key);
261 if (!ipv6_addr_any(local))
263 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
265 h ^= HASH_ADDR(remote);
268 return &ign->tunnels[prio][h];
271 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
273 if (t->parms.collect_md)
274 rcu_assign_pointer(ign->collect_md_tun, t);
277 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
279 if (t->parms.collect_md)
280 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
283 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
285 if (t->parms.collect_md)
286 rcu_assign_pointer(ign->collect_md_tun, NULL);
289 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
292 if (t->parms.collect_md)
293 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
296 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
297 const struct ip6_tnl *t)
299 return __ip6gre_bucket(ign, &t->parms);
302 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
304 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
306 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
307 rcu_assign_pointer(*tp, t);
310 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
312 struct ip6_tnl __rcu **tp;
313 struct ip6_tnl *iter;
315 for (tp = ip6gre_bucket(ign, t);
316 (iter = rtnl_dereference(*tp)) != NULL;
319 rcu_assign_pointer(*tp, t->next);
325 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
326 const struct __ip6_tnl_parm *parms,
329 const struct in6_addr *remote = &parms->raddr;
330 const struct in6_addr *local = &parms->laddr;
331 __be32 key = parms->i_key;
332 int link = parms->link;
334 struct ip6_tnl __rcu **tp;
335 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
337 for (tp = __ip6gre_bucket(ign, parms);
338 (t = rtnl_dereference(*tp)) != NULL;
340 if (ipv6_addr_equal(local, &t->parms.laddr) &&
341 ipv6_addr_equal(remote, &t->parms.raddr) &&
342 key == t->parms.i_key &&
343 link == t->parms.link &&
344 type == t->dev->type)
350 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
351 const struct __ip6_tnl_parm *parms, int create)
353 struct ip6_tnl *t, *nt;
354 struct net_device *dev;
356 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
358 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
364 if (parms->name[0]) {
365 if (!dev_valid_name(parms->name))
367 strlcpy(name, parms->name, IFNAMSIZ);
369 strcpy(name, "ip6gre%d");
371 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
372 ip6gre_tunnel_setup);
376 dev_net_set(dev, net);
378 nt = netdev_priv(dev);
380 dev->rtnl_link_ops = &ip6gre_link_ops;
383 nt->net = dev_net(dev);
385 if (register_netdevice(dev) < 0)
388 ip6gre_tnl_link_config(nt, 1);
390 /* Can use a lockless transmit, unless we generate output sequences */
391 if (!(nt->parms.o_flags & TUNNEL_SEQ))
392 dev->features |= NETIF_F_LLTX;
395 ip6gre_tunnel_link(ign, nt);
403 static void ip6erspan_tunnel_uninit(struct net_device *dev)
405 struct ip6_tnl *t = netdev_priv(dev);
406 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
408 ip6erspan_tunnel_unlink_md(ign, t);
409 ip6gre_tunnel_unlink(ign, t);
410 dst_cache_reset(&t->dst_cache);
414 static void ip6gre_tunnel_uninit(struct net_device *dev)
416 struct ip6_tnl *t = netdev_priv(dev);
417 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
419 ip6gre_tunnel_unlink_md(ign, t);
420 ip6gre_tunnel_unlink(ign, t);
421 dst_cache_reset(&t->dst_cache);
426 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
427 u8 type, u8 code, int offset, __be32 info)
429 struct net *net = dev_net(skb->dev);
430 const struct gre_base_hdr *greh;
431 const struct ipv6hdr *ipv6h;
432 int grehlen = sizeof(*greh);
438 if (!pskb_may_pull(skb, offset + grehlen))
440 greh = (const struct gre_base_hdr *)(skb->data + offset);
442 if (flags & (GRE_VERSION | GRE_ROUTING))
444 if (flags & GRE_CSUM)
446 if (flags & GRE_KEY) {
447 key_off = grehlen + offset;
451 if (!pskb_may_pull(skb, offset + grehlen))
453 ipv6h = (const struct ipv6hdr *)skb->data;
454 greh = (const struct gre_base_hdr *)(skb->data + offset);
455 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
457 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
458 key, greh->protocol);
463 struct ipv6_tlv_tnl_enc_lim *tel;
465 case ICMPV6_DEST_UNREACH:
466 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
468 if (code != ICMPV6_PORT_UNREACH)
471 case ICMPV6_TIME_EXCEED:
472 if (code == ICMPV6_EXC_HOPLIMIT) {
473 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
478 case ICMPV6_PARAMPROB:
480 if (code == ICMPV6_HDR_FIELD)
481 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
483 if (teli && teli == be32_to_cpu(info) - 2) {
484 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
485 if (tel->encap_limit == 0) {
486 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
490 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
494 case ICMPV6_PKT_TOOBIG:
495 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
498 ip6_redirect(skb, net, skb->dev->ifindex, 0,
499 sock_net_uid(net, NULL));
503 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
507 t->err_time = jiffies;
510 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
512 const struct ipv6hdr *ipv6h;
513 struct ip6_tnl *tunnel;
515 ipv6h = ipv6_hdr(skb);
516 tunnel = ip6gre_tunnel_lookup(skb->dev,
517 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
520 if (tunnel->parms.collect_md) {
521 struct metadata_dst *tun_dst;
526 tun_id = key32_to_tunnel_id(tpi->key);
528 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
530 return PACKET_REJECT;
532 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
534 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
540 return PACKET_REJECT;
543 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
544 struct tnl_ptk_info *tpi)
546 struct erspan_base_hdr *ershdr;
547 struct erspan_metadata *pkt_md;
548 const struct ipv6hdr *ipv6h;
549 struct erspan_md2 *md2;
550 struct ip6_tnl *tunnel;
553 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
554 return PACKET_REJECT;
556 ipv6h = ipv6_hdr(skb);
557 ershdr = (struct erspan_base_hdr *)skb->data;
559 tpi->key = cpu_to_be32(get_session_id(ershdr));
561 tunnel = ip6gre_tunnel_lookup(skb->dev,
562 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
565 int len = erspan_hdr_len(ver);
567 if (unlikely(!pskb_may_pull(skb, len)))
568 return PACKET_REJECT;
570 ershdr = (struct erspan_base_hdr *)skb->data;
571 pkt_md = (struct erspan_metadata *)(ershdr + 1);
573 if (__iptunnel_pull_header(skb, len,
576 return PACKET_REJECT;
578 if (tunnel->parms.collect_md) {
579 struct metadata_dst *tun_dst;
580 struct ip_tunnel_info *info;
581 struct erspan_metadata *md;
585 tpi->flags |= TUNNEL_KEY;
587 tun_id = key32_to_tunnel_id(tpi->key);
589 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
592 return PACKET_REJECT;
594 info = &tun_dst->u.tun_info;
595 md = ip_tunnel_info_opts(info);
598 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
600 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
601 info->options_len = sizeof(*md);
603 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
606 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
612 return PACKET_REJECT;
615 static int gre_rcv(struct sk_buff *skb)
617 struct tnl_ptk_info tpi;
618 bool csum_err = false;
621 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
625 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
628 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
629 tpi.proto == htons(ETH_P_ERSPAN2))) {
630 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
635 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
639 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
645 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
647 return iptunnel_handle_offloads(skb,
648 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
651 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
652 struct net_device *dev,
653 struct flowi6 *fl6, __u8 *dsfield,
656 const struct iphdr *iph = ip_hdr(skb);
657 struct ip6_tnl *t = netdev_priv(dev);
659 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
660 *encap_limit = t->parms.encap_limit;
662 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
665 *dsfield = ipv4_get_dsfield(iph);
667 *dsfield = ip6_tclass(t->parms.flowinfo);
669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
670 fl6->flowi6_mark = skb->mark;
672 fl6->flowi6_mark = t->parms.fwmark;
674 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
677 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
678 struct net_device *dev,
679 struct flowi6 *fl6, __u8 *dsfield,
682 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
683 struct ip6_tnl *t = netdev_priv(dev);
686 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
687 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
690 struct ipv6_tlv_tnl_enc_lim *tel;
692 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
693 if (tel->encap_limit == 0) {
694 icmpv6_send(skb, ICMPV6_PARAMPROB,
695 ICMPV6_HDR_FIELD, offset + 2);
698 *encap_limit = tel->encap_limit - 1;
699 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
700 *encap_limit = t->parms.encap_limit;
703 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
705 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
706 *dsfield = ipv6_get_dsfield(ipv6h);
708 *dsfield = ip6_tclass(t->parms.flowinfo);
710 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
711 fl6->flowlabel |= ip6_flowlabel(ipv6h);
713 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
714 fl6->flowi6_mark = skb->mark;
716 fl6->flowi6_mark = t->parms.fwmark;
718 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
723 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
724 struct net_device *dev, __u8 dsfield,
725 struct flowi6 *fl6, int encap_limit,
726 __u32 *pmtu, __be16 proto)
728 struct ip6_tnl *tunnel = netdev_priv(dev);
731 if (dev->type == ARPHRD_ETHER)
732 IPCB(skb)->flags = 0;
734 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
735 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
737 fl6->daddr = tunnel->parms.raddr;
739 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
742 /* Push GRE header. */
743 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
745 if (tunnel->parms.collect_md) {
746 struct ip_tunnel_info *tun_info;
747 const struct ip_tunnel_key *key;
750 tun_info = skb_tunnel_info(skb);
751 if (unlikely(!tun_info ||
752 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
753 ip_tunnel_info_af(tun_info) != AF_INET6))
756 key = &tun_info->key;
757 memset(fl6, 0, sizeof(*fl6));
758 fl6->flowi6_proto = IPPROTO_GRE;
759 fl6->daddr = key->u.ipv6.dst;
760 fl6->flowlabel = key->label;
761 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
764 flags = key->tun_flags &
765 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
766 tunnel->tun_hlen = gre_calc_hlen(flags);
768 gre_build_header(skb, tunnel->tun_hlen,
770 tunnel_id_to_key32(tun_info->key.tun_id),
771 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
775 if (tunnel->parms.o_flags & TUNNEL_SEQ)
778 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
779 protocol, tunnel->parms.o_key,
780 htonl(tunnel->o_seqno));
783 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
787 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
789 struct ip6_tnl *t = netdev_priv(dev);
790 int encap_limit = -1;
796 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
798 if (!t->parms.collect_md)
799 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
800 &dsfield, &encap_limit);
802 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
806 err = __gre6_xmit(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;
829 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
832 if (!t->parms.collect_md &&
833 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
836 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
839 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
840 &mtu, skb->protocol);
842 if (err == -EMSGSIZE)
843 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
851 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
852 * @t: the outgoing tunnel device
853 * @hdr: IPv6 header from the incoming packet
856 * Avoid trivial tunneling loop by checking that tunnel exit-point
857 * doesn't match source of incoming packet.
864 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
865 const struct ipv6hdr *hdr)
867 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
870 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
872 struct ip6_tnl *t = netdev_priv(dev);
873 int encap_limit = -1;
878 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
879 encap_limit = t->parms.encap_limit;
881 if (!t->parms.collect_md)
882 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
884 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
888 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
893 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
894 struct net_device *dev)
896 struct ip6_tnl *t = netdev_priv(dev);
897 struct net_device_stats *stats = &t->dev->stats;
900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
903 switch (skb->protocol) {
904 case htons(ETH_P_IP):
905 ret = ip6gre_xmit_ipv4(skb, dev);
907 case htons(ETH_P_IPV6):
908 ret = ip6gre_xmit_ipv6(skb, dev);
911 ret = ip6gre_xmit_other(skb, dev);
927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
930 struct ip6_tnl *t = netdev_priv(dev);
931 struct dst_entry *dst = skb_dst(skb);
932 struct net_device_stats *stats;
933 bool truncate = false;
934 int encap_limit = -1;
935 __u8 dsfield = false;
942 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
945 if (gre_handle_offloads(skb, false))
948 if (skb->len > dev->mtu + dev->hard_header_len) {
949 pskb_trim(skb, dev->mtu + dev->hard_header_len);
953 nhoff = skb_network_header(skb) - skb_mac_header(skb);
954 if (skb->protocol == htons(ETH_P_IP) &&
955 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
958 thoff = skb_transport_header(skb) - skb_mac_header(skb);
959 if (skb->protocol == htons(ETH_P_IPV6) &&
960 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
963 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
966 t->parms.o_flags &= ~TUNNEL_KEY;
967 IPCB(skb)->flags = 0;
969 /* For collect_md mode, derive fl6 from the tunnel key,
970 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
972 if (t->parms.collect_md) {
973 struct ip_tunnel_info *tun_info;
974 const struct ip_tunnel_key *key;
975 struct erspan_metadata *md;
978 tun_info = skb_tunnel_info(skb);
979 if (unlikely(!tun_info ||
980 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
981 ip_tunnel_info_af(tun_info) != AF_INET6))
984 key = &tun_info->key;
985 memset(&fl6, 0, sizeof(fl6));
986 fl6.flowi6_proto = IPPROTO_GRE;
987 fl6.daddr = key->u.ipv6.dst;
988 fl6.flowlabel = key->label;
989 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
992 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
994 md = ip_tunnel_info_opts(tun_info);
998 tun_id = tunnel_id_to_key32(key->tun_id);
999 if (md->version == 1) {
1000 erspan_build_header(skb,
1002 ntohl(md->u.index), truncate,
1004 } else if (md->version == 2) {
1005 erspan_build_header_v2(skb,
1008 get_hwid(&md->u.md2),
1014 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1016 switch (skb->protocol) {
1017 case htons(ETH_P_IP):
1018 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1019 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1020 &dsfield, &encap_limit);
1022 case htons(ETH_P_IPV6):
1023 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1025 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1026 &dsfield, &encap_limit))
1030 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1034 if (t->parms.erspan_ver == 1)
1035 erspan_build_header(skb, ntohl(t->parms.o_key),
1038 else if (t->parms.erspan_ver == 2)
1039 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1046 fl6.daddr = t->parms.raddr;
1049 /* Push GRE header. */
1050 gre_build_header(skb, 8, TUNNEL_SEQ,
1051 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1053 /* TooBig packet may have updated dst->dev's mtu */
1054 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1055 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1057 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1060 /* XXX: send ICMP error even if DF is not set. */
1061 if (err == -EMSGSIZE) {
1062 if (skb->protocol == htons(ETH_P_IP))
1063 icmp_send(skb, ICMP_DEST_UNREACH,
1064 ICMP_FRAG_NEEDED, htonl(mtu));
1066 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1071 return NETDEV_TX_OK;
1074 stats = &t->dev->stats;
1076 stats->tx_dropped++;
1078 return NETDEV_TX_OK;
1081 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1083 struct net_device *dev = t->dev;
1084 struct __ip6_tnl_parm *p = &t->parms;
1085 struct flowi6 *fl6 = &t->fl.u.ip6;
1087 if (dev->type != ARPHRD_ETHER) {
1088 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1089 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1092 /* Set up flowi template */
1093 fl6->saddr = p->laddr;
1094 fl6->daddr = p->raddr;
1095 fl6->flowi6_oif = p->link;
1097 fl6->flowi6_proto = IPPROTO_GRE;
1099 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1100 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1101 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1102 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1104 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1105 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1107 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1108 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1109 dev->flags |= IFF_POINTOPOINT;
1111 dev->flags &= ~IFF_POINTOPOINT;
1114 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1117 const struct __ip6_tnl_parm *p = &t->parms;
1118 struct net_device *dev = t->dev;
1120 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1121 int strict = (ipv6_addr_type(&p->raddr) &
1122 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1124 struct rt6_info *rt = rt6_lookup(t->net,
1125 &p->raddr, &p->laddr,
1126 p->link, NULL, strict);
1132 dev->needed_headroom = rt->dst.dev->hard_header_len +
1136 dev->mtu = rt->dst.dev->mtu - t_hlen;
1137 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1139 if (dev->type == ARPHRD_ETHER)
1140 dev->mtu -= ETH_HLEN;
1142 if (dev->mtu < IPV6_MIN_MTU)
1143 dev->mtu = IPV6_MIN_MTU;
1150 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1154 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1155 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1157 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1158 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1162 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1164 ip6gre_tnl_link_config_common(t);
1165 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1168 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1169 const struct __ip6_tnl_parm *p)
1171 t->parms.laddr = p->laddr;
1172 t->parms.raddr = p->raddr;
1173 t->parms.flags = p->flags;
1174 t->parms.hop_limit = p->hop_limit;
1175 t->parms.encap_limit = p->encap_limit;
1176 t->parms.flowinfo = p->flowinfo;
1177 t->parms.link = p->link;
1178 t->parms.proto = p->proto;
1179 t->parms.i_key = p->i_key;
1180 t->parms.o_key = p->o_key;
1181 t->parms.i_flags = p->i_flags;
1182 t->parms.o_flags = p->o_flags;
1183 t->parms.fwmark = p->fwmark;
1184 dst_cache_reset(&t->dst_cache);
1187 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1190 ip6gre_tnl_copy_tnl_parm(t, p);
1191 ip6gre_tnl_link_config(t, set_mtu);
1195 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1196 const struct ip6_tnl_parm2 *u)
1198 p->laddr = u->laddr;
1199 p->raddr = u->raddr;
1200 p->flags = u->flags;
1201 p->hop_limit = u->hop_limit;
1202 p->encap_limit = u->encap_limit;
1203 p->flowinfo = u->flowinfo;
1205 p->i_key = u->i_key;
1206 p->o_key = u->o_key;
1207 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1208 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1209 memcpy(p->name, u->name, sizeof(u->name));
1212 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1213 const struct __ip6_tnl_parm *p)
1215 u->proto = IPPROTO_GRE;
1216 u->laddr = p->laddr;
1217 u->raddr = p->raddr;
1218 u->flags = p->flags;
1219 u->hop_limit = p->hop_limit;
1220 u->encap_limit = p->encap_limit;
1221 u->flowinfo = p->flowinfo;
1223 u->i_key = p->i_key;
1224 u->o_key = p->o_key;
1225 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1226 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1227 memcpy(u->name, p->name, sizeof(u->name));
1230 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1231 struct ifreq *ifr, int cmd)
1234 struct ip6_tnl_parm2 p;
1235 struct __ip6_tnl_parm p1;
1236 struct ip6_tnl *t = netdev_priv(dev);
1237 struct net *net = t->net;
1238 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1240 memset(&p1, 0, sizeof(p1));
1244 if (dev == ign->fb_tunnel_dev) {
1245 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1249 ip6gre_tnl_parm_from_user(&p1, &p);
1250 t = ip6gre_tunnel_locate(net, &p1, 0);
1252 t = netdev_priv(dev);
1254 memset(&p, 0, sizeof(p));
1255 ip6gre_tnl_parm_to_user(&p, &t->parms);
1256 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1263 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1267 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1271 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1274 if (!(p.i_flags&GRE_KEY))
1276 if (!(p.o_flags&GRE_KEY))
1279 ip6gre_tnl_parm_from_user(&p1, &p);
1280 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1282 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1284 if (t->dev != dev) {
1289 t = netdev_priv(dev);
1291 ip6gre_tunnel_unlink(ign, t);
1293 ip6gre_tnl_change(t, &p1, 1);
1294 ip6gre_tunnel_link(ign, t);
1295 netdev_state_change(dev);
1302 memset(&p, 0, sizeof(p));
1303 ip6gre_tnl_parm_to_user(&p, &t->parms);
1304 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1307 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1312 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1315 if (dev == ign->fb_tunnel_dev) {
1317 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1320 ip6gre_tnl_parm_from_user(&p1, &p);
1321 t = ip6gre_tunnel_locate(net, &p1, 0);
1325 if (t == netdev_priv(ign->fb_tunnel_dev))
1329 unregister_netdevice(dev);
1341 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1342 unsigned short type, const void *daddr,
1343 const void *saddr, unsigned int len)
1345 struct ip6_tnl *t = netdev_priv(dev);
1346 struct ipv6hdr *ipv6h;
1349 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1350 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1351 t->fl.u.ip6.flowlabel,
1352 true, &t->fl.u.ip6));
1353 ipv6h->hop_limit = t->parms.hop_limit;
1354 ipv6h->nexthdr = NEXTHDR_GRE;
1355 ipv6h->saddr = t->parms.laddr;
1356 ipv6h->daddr = t->parms.raddr;
1358 p = (__be16 *)(ipv6h + 1);
1359 p[0] = t->parms.o_flags;
1363 * Set the source hardware address.
1367 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1369 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1370 if (!ipv6_addr_any(&ipv6h->daddr))
1376 static const struct header_ops ip6gre_header_ops = {
1377 .create = ip6gre_header,
1380 static const struct net_device_ops ip6gre_netdev_ops = {
1381 .ndo_init = ip6gre_tunnel_init,
1382 .ndo_uninit = ip6gre_tunnel_uninit,
1383 .ndo_start_xmit = ip6gre_tunnel_xmit,
1384 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1385 .ndo_change_mtu = ip6_tnl_change_mtu,
1386 .ndo_get_stats64 = ip_tunnel_get_stats64,
1387 .ndo_get_iflink = ip6_tnl_get_iflink,
1390 static void ip6gre_dev_free(struct net_device *dev)
1392 struct ip6_tnl *t = netdev_priv(dev);
1394 gro_cells_destroy(&t->gro_cells);
1395 dst_cache_destroy(&t->dst_cache);
1396 free_percpu(dev->tstats);
1399 static void ip6gre_tunnel_setup(struct net_device *dev)
1401 dev->netdev_ops = &ip6gre_netdev_ops;
1402 dev->needs_free_netdev = true;
1403 dev->priv_destructor = ip6gre_dev_free;
1405 dev->type = ARPHRD_IP6GRE;
1407 dev->flags |= IFF_NOARP;
1408 dev->addr_len = sizeof(struct in6_addr);
1409 netif_keep_dst(dev);
1410 /* This perm addr will be used as interface identifier by IPv6 */
1411 dev->addr_assign_type = NET_ADDR_RANDOM;
1412 eth_random_addr(dev->perm_addr);
1415 #define GRE6_FEATURES (NETIF_F_SG | \
1416 NETIF_F_FRAGLIST | \
1420 static void ip6gre_tnl_init_features(struct net_device *dev)
1422 struct ip6_tnl *nt = netdev_priv(dev);
1424 dev->features |= GRE6_FEATURES;
1425 dev->hw_features |= GRE6_FEATURES;
1427 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1428 /* TCP offload with GRE SEQ is not supported, nor
1429 * can we support 2 levels of outer headers requiring
1432 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1433 nt->encap.type == TUNNEL_ENCAP_NONE) {
1434 dev->features |= NETIF_F_GSO_SOFTWARE;
1435 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1438 /* Can use a lockless transmit, unless we generate
1441 dev->features |= NETIF_F_LLTX;
1445 static int ip6gre_tunnel_init_common(struct net_device *dev)
1447 struct ip6_tnl *tunnel;
1451 tunnel = netdev_priv(dev);
1454 tunnel->net = dev_net(dev);
1455 strcpy(tunnel->parms.name, dev->name);
1457 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1461 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1463 goto cleanup_alloc_pcpu_stats;
1465 ret = gro_cells_init(&tunnel->gro_cells, dev);
1467 goto cleanup_dst_cache_init;
1469 t_hlen = ip6gre_calc_hlen(tunnel);
1470 dev->mtu = ETH_DATA_LEN - t_hlen;
1471 if (dev->type == ARPHRD_ETHER)
1472 dev->mtu -= ETH_HLEN;
1473 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1476 if (tunnel->parms.collect_md) {
1477 dev->features |= NETIF_F_NETNS_LOCAL;
1478 netif_keep_dst(dev);
1480 ip6gre_tnl_init_features(dev);
1484 cleanup_dst_cache_init:
1485 dst_cache_destroy(&tunnel->dst_cache);
1486 cleanup_alloc_pcpu_stats:
1487 free_percpu(dev->tstats);
1492 static int ip6gre_tunnel_init(struct net_device *dev)
1494 struct ip6_tnl *tunnel;
1497 ret = ip6gre_tunnel_init_common(dev);
1501 tunnel = netdev_priv(dev);
1503 if (tunnel->parms.collect_md)
1506 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1507 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1509 if (ipv6_addr_any(&tunnel->parms.raddr))
1510 dev->header_ops = &ip6gre_header_ops;
1515 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1517 struct ip6_tnl *tunnel = netdev_priv(dev);
1520 tunnel->net = dev_net(dev);
1521 strcpy(tunnel->parms.name, dev->name);
1523 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1528 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1530 .err_handler = ip6gre_err,
1531 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1534 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1536 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1537 struct net_device *dev, *aux;
1540 for_each_netdev_safe(net, dev, aux)
1541 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1542 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1543 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1544 unregister_netdevice_queue(dev, head);
1546 for (prio = 0; prio < 4; prio++) {
1548 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1551 t = rtnl_dereference(ign->tunnels[prio][h]);
1554 /* If dev is in the same netns, it has already
1555 * been added to the list by the previous loop.
1557 if (!net_eq(dev_net(t->dev), net))
1558 unregister_netdevice_queue(t->dev,
1560 t = rtnl_dereference(t->next);
1566 static int __net_init ip6gre_init_net(struct net *net)
1568 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571 if (!net_has_fallback_tunnels(net))
1573 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1575 ip6gre_tunnel_setup);
1576 if (!ign->fb_tunnel_dev) {
1580 dev_net_set(ign->fb_tunnel_dev, net);
1581 /* FB netdevice is special: we have one, and only one per netns.
1582 * Allowing to move it to another netns is clearly unsafe.
1584 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1587 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1588 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1590 err = register_netdev(ign->fb_tunnel_dev);
1594 rcu_assign_pointer(ign->tunnels_wc[0],
1595 netdev_priv(ign->fb_tunnel_dev));
1599 free_netdev(ign->fb_tunnel_dev);
1604 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1610 list_for_each_entry(net, net_list, exit_list)
1611 ip6gre_destroy_tunnels(net, &list);
1612 unregister_netdevice_many(&list);
1616 static struct pernet_operations ip6gre_net_ops = {
1617 .init = ip6gre_init_net,
1618 .exit_batch = ip6gre_exit_batch_net,
1619 .id = &ip6gre_net_id,
1620 .size = sizeof(struct ip6gre_net),
1623 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1624 struct netlink_ext_ack *extack)
1632 if (data[IFLA_GRE_IFLAGS])
1633 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1634 if (data[IFLA_GRE_OFLAGS])
1635 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1636 if (flags & (GRE_VERSION|GRE_ROUTING))
1642 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1643 struct netlink_ext_ack *extack)
1645 struct in6_addr daddr;
1647 if (tb[IFLA_ADDRESS]) {
1648 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1650 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1651 return -EADDRNOTAVAIL;
1657 if (data[IFLA_GRE_REMOTE]) {
1658 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1659 if (ipv6_addr_any(&daddr))
1664 return ip6gre_tunnel_validate(tb, data, extack);
1667 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1668 struct netlink_ext_ack *extack)
1676 ret = ip6gre_tap_validate(tb, data, extack);
1680 /* ERSPAN should only have GRE sequence and key flag */
1681 if (data[IFLA_GRE_OFLAGS])
1682 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1683 if (data[IFLA_GRE_IFLAGS])
1684 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1685 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1686 flags != (GRE_SEQ | GRE_KEY))
1689 /* ERSPAN Session ID only has 10-bit. Since we reuse
1690 * 32-bit key field as ID, check it's range.
1692 if (data[IFLA_GRE_IKEY] &&
1693 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1696 if (data[IFLA_GRE_OKEY] &&
1697 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1700 if (data[IFLA_GRE_ERSPAN_VER]) {
1701 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1702 if (ver != 1 && ver != 2)
1707 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1708 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1710 if (index & ~INDEX_MASK)
1713 } else if (ver == 2) {
1714 if (data[IFLA_GRE_ERSPAN_DIR]) {
1715 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1717 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1721 if (data[IFLA_GRE_ERSPAN_HWID]) {
1722 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1724 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1732 static void ip6gre_netlink_parms(struct nlattr *data[],
1733 struct __ip6_tnl_parm *parms)
1735 memset(parms, 0, sizeof(*parms));
1740 if (data[IFLA_GRE_LINK])
1741 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1743 if (data[IFLA_GRE_IFLAGS])
1744 parms->i_flags = gre_flags_to_tnl_flags(
1745 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1747 if (data[IFLA_GRE_OFLAGS])
1748 parms->o_flags = gre_flags_to_tnl_flags(
1749 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1751 if (data[IFLA_GRE_IKEY])
1752 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1754 if (data[IFLA_GRE_OKEY])
1755 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1757 if (data[IFLA_GRE_LOCAL])
1758 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1760 if (data[IFLA_GRE_REMOTE])
1761 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1763 if (data[IFLA_GRE_TTL])
1764 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1766 if (data[IFLA_GRE_ENCAP_LIMIT])
1767 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1769 if (data[IFLA_GRE_FLOWINFO])
1770 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1772 if (data[IFLA_GRE_FLAGS])
1773 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1775 if (data[IFLA_GRE_FWMARK])
1776 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1778 if (data[IFLA_GRE_COLLECT_METADATA])
1779 parms->collect_md = true;
1781 if (data[IFLA_GRE_ERSPAN_VER])
1782 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1784 if (parms->erspan_ver == 1) {
1785 if (data[IFLA_GRE_ERSPAN_INDEX])
1786 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1787 } else if (parms->erspan_ver == 2) {
1788 if (data[IFLA_GRE_ERSPAN_DIR])
1789 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1790 if (data[IFLA_GRE_ERSPAN_HWID])
1791 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1795 static int ip6gre_tap_init(struct net_device *dev)
1799 ret = ip6gre_tunnel_init_common(dev);
1803 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1808 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1809 .ndo_init = ip6gre_tap_init,
1810 .ndo_uninit = ip6gre_tunnel_uninit,
1811 .ndo_start_xmit = ip6gre_tunnel_xmit,
1812 .ndo_set_mac_address = eth_mac_addr,
1813 .ndo_validate_addr = eth_validate_addr,
1814 .ndo_change_mtu = ip6_tnl_change_mtu,
1815 .ndo_get_stats64 = ip_tunnel_get_stats64,
1816 .ndo_get_iflink = ip6_tnl_get_iflink,
1819 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1823 tunnel->tun_hlen = 8;
1824 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1825 erspan_hdr_len(tunnel->parms.erspan_ver);
1827 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1828 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1832 static int ip6erspan_tap_init(struct net_device *dev)
1834 struct ip6_tnl *tunnel;
1838 tunnel = netdev_priv(dev);
1841 tunnel->net = dev_net(dev);
1842 strcpy(tunnel->parms.name, dev->name);
1844 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1848 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1850 goto cleanup_alloc_pcpu_stats;
1852 ret = gro_cells_init(&tunnel->gro_cells, dev);
1854 goto cleanup_dst_cache_init;
1856 t_hlen = ip6erspan_calc_hlen(tunnel);
1857 dev->mtu = ETH_DATA_LEN - t_hlen;
1858 if (dev->type == ARPHRD_ETHER)
1859 dev->mtu -= ETH_HLEN;
1860 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1863 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1864 ip6erspan_tnl_link_config(tunnel, 1);
1868 cleanup_dst_cache_init:
1869 dst_cache_destroy(&tunnel->dst_cache);
1870 cleanup_alloc_pcpu_stats:
1871 free_percpu(dev->tstats);
1876 static const struct net_device_ops ip6erspan_netdev_ops = {
1877 .ndo_init = ip6erspan_tap_init,
1878 .ndo_uninit = ip6erspan_tunnel_uninit,
1879 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1880 .ndo_set_mac_address = eth_mac_addr,
1881 .ndo_validate_addr = eth_validate_addr,
1882 .ndo_change_mtu = ip6_tnl_change_mtu,
1883 .ndo_get_stats64 = ip_tunnel_get_stats64,
1884 .ndo_get_iflink = ip6_tnl_get_iflink,
1887 static void ip6gre_tap_setup(struct net_device *dev)
1893 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1894 dev->needs_free_netdev = true;
1895 dev->priv_destructor = ip6gre_dev_free;
1897 dev->features |= NETIF_F_NETNS_LOCAL;
1898 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1900 netif_keep_dst(dev);
1903 bool is_ip6gretap_dev(const struct net_device *dev)
1905 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1907 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1909 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1910 struct ip_tunnel_encap *ipencap)
1914 memset(ipencap, 0, sizeof(*ipencap));
1919 if (data[IFLA_GRE_ENCAP_TYPE]) {
1921 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1924 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1926 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1929 if (data[IFLA_GRE_ENCAP_SPORT]) {
1931 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1934 if (data[IFLA_GRE_ENCAP_DPORT]) {
1936 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1942 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1943 struct nlattr *tb[], struct nlattr *data[],
1944 struct netlink_ext_ack *extack)
1947 struct ip_tunnel_encap ipencap;
1950 nt = netdev_priv(dev);
1952 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1953 int err = ip6_tnl_encap_setup(nt, &ipencap);
1959 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1960 eth_hw_addr_random(dev);
1963 nt->net = dev_net(dev);
1965 err = register_netdevice(dev);
1970 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1978 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1979 struct nlattr *tb[], struct nlattr *data[],
1980 struct netlink_ext_ack *extack)
1982 struct ip6_tnl *nt = netdev_priv(dev);
1983 struct net *net = dev_net(dev);
1984 struct ip6gre_net *ign;
1987 ip6gre_netlink_parms(data, &nt->parms);
1988 ign = net_generic(net, ip6gre_net_id);
1990 if (nt->parms.collect_md) {
1991 if (rtnl_dereference(ign->collect_md_tun))
1994 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1998 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2000 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2001 ip6gre_tunnel_link_md(ign, nt);
2002 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2007 static struct ip6_tnl *
2008 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2009 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2010 struct netlink_ext_ack *extack)
2012 struct ip6_tnl *t, *nt = netdev_priv(dev);
2013 struct net *net = nt->net;
2014 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2015 struct ip_tunnel_encap ipencap;
2017 if (dev == ign->fb_tunnel_dev)
2018 return ERR_PTR(-EINVAL);
2020 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2021 int err = ip6_tnl_encap_setup(nt, &ipencap);
2024 return ERR_PTR(err);
2027 ip6gre_netlink_parms(data, p_p);
2029 t = ip6gre_tunnel_locate(net, p_p, 0);
2033 return ERR_PTR(-EEXIST);
2041 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2042 struct nlattr *data[],
2043 struct netlink_ext_ack *extack)
2045 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2046 struct __ip6_tnl_parm p;
2049 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2053 ip6gre_tunnel_unlink_md(ign, t);
2054 ip6gre_tunnel_unlink(ign, t);
2055 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2056 ip6gre_tunnel_link_md(ign, t);
2057 ip6gre_tunnel_link(ign, t);
2061 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2063 struct net *net = dev_net(dev);
2064 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2066 if (dev != ign->fb_tunnel_dev)
2067 unregister_netdevice_queue(dev, head);
2070 static size_t ip6gre_get_size(const struct net_device *dev)
2075 /* IFLA_GRE_IFLAGS */
2077 /* IFLA_GRE_OFLAGS */
2083 /* IFLA_GRE_LOCAL */
2084 nla_total_size(sizeof(struct in6_addr)) +
2085 /* IFLA_GRE_REMOTE */
2086 nla_total_size(sizeof(struct in6_addr)) +
2089 /* IFLA_GRE_ENCAP_LIMIT */
2091 /* IFLA_GRE_FLOWINFO */
2093 /* IFLA_GRE_FLAGS */
2095 /* IFLA_GRE_ENCAP_TYPE */
2097 /* IFLA_GRE_ENCAP_FLAGS */
2099 /* IFLA_GRE_ENCAP_SPORT */
2101 /* IFLA_GRE_ENCAP_DPORT */
2103 /* IFLA_GRE_COLLECT_METADATA */
2105 /* IFLA_GRE_FWMARK */
2107 /* IFLA_GRE_ERSPAN_INDEX */
2112 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2114 struct ip6_tnl *t = netdev_priv(dev);
2115 struct __ip6_tnl_parm *p = &t->parms;
2117 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2118 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2119 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2120 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2121 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2122 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2123 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2124 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2125 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2126 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2127 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2128 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2129 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2130 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2131 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2132 goto nla_put_failure;
2134 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2136 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2138 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2140 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2142 goto nla_put_failure;
2144 if (p->collect_md) {
2145 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2146 goto nla_put_failure;
2149 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2150 goto nla_put_failure;
2152 if (p->erspan_ver == 1) {
2153 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2154 goto nla_put_failure;
2155 } else if (p->erspan_ver == 2) {
2156 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2157 goto nla_put_failure;
2158 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2159 goto nla_put_failure;
2168 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2169 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2170 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2171 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2172 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2173 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2174 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2175 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2176 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2177 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2178 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2179 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2180 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2181 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2182 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2183 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2184 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2185 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2186 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2187 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2188 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2189 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2192 static void ip6erspan_tap_setup(struct net_device *dev)
2196 dev->netdev_ops = &ip6erspan_netdev_ops;
2197 dev->needs_free_netdev = true;
2198 dev->priv_destructor = ip6gre_dev_free;
2200 dev->features |= NETIF_F_NETNS_LOCAL;
2201 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2202 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2203 netif_keep_dst(dev);
2206 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2207 struct nlattr *tb[], struct nlattr *data[],
2208 struct netlink_ext_ack *extack)
2210 struct ip6_tnl *nt = netdev_priv(dev);
2211 struct net *net = dev_net(dev);
2212 struct ip6gre_net *ign;
2215 ip6gre_netlink_parms(data, &nt->parms);
2216 ign = net_generic(net, ip6gre_net_id);
2218 if (nt->parms.collect_md) {
2219 if (rtnl_dereference(ign->collect_md_tun_erspan))
2222 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2226 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2228 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2229 ip6erspan_tunnel_link_md(ign, nt);
2230 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2235 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2237 ip6gre_tnl_link_config_common(t);
2238 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2241 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2242 const struct __ip6_tnl_parm *p, int set_mtu)
2244 ip6gre_tnl_copy_tnl_parm(t, p);
2245 ip6erspan_tnl_link_config(t, set_mtu);
2249 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2250 struct nlattr *data[],
2251 struct netlink_ext_ack *extack)
2253 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2254 struct __ip6_tnl_parm p;
2257 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2261 ip6gre_tunnel_unlink_md(ign, t);
2262 ip6gre_tunnel_unlink(ign, t);
2263 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2264 ip6erspan_tunnel_link_md(ign, t);
2265 ip6gre_tunnel_link(ign, t);
2269 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2271 .maxtype = IFLA_GRE_MAX,
2272 .policy = ip6gre_policy,
2273 .priv_size = sizeof(struct ip6_tnl),
2274 .setup = ip6gre_tunnel_setup,
2275 .validate = ip6gre_tunnel_validate,
2276 .newlink = ip6gre_newlink,
2277 .changelink = ip6gre_changelink,
2278 .dellink = ip6gre_dellink,
2279 .get_size = ip6gre_get_size,
2280 .fill_info = ip6gre_fill_info,
2281 .get_link_net = ip6_tnl_get_link_net,
2284 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2285 .kind = "ip6gretap",
2286 .maxtype = IFLA_GRE_MAX,
2287 .policy = ip6gre_policy,
2288 .priv_size = sizeof(struct ip6_tnl),
2289 .setup = ip6gre_tap_setup,
2290 .validate = ip6gre_tap_validate,
2291 .newlink = ip6gre_newlink,
2292 .changelink = ip6gre_changelink,
2293 .get_size = ip6gre_get_size,
2294 .fill_info = ip6gre_fill_info,
2295 .get_link_net = ip6_tnl_get_link_net,
2298 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2299 .kind = "ip6erspan",
2300 .maxtype = IFLA_GRE_MAX,
2301 .policy = ip6gre_policy,
2302 .priv_size = sizeof(struct ip6_tnl),
2303 .setup = ip6erspan_tap_setup,
2304 .validate = ip6erspan_tap_validate,
2305 .newlink = ip6erspan_newlink,
2306 .changelink = ip6erspan_changelink,
2307 .get_size = ip6gre_get_size,
2308 .fill_info = ip6gre_fill_info,
2309 .get_link_net = ip6_tnl_get_link_net,
2313 * And now the modules code and kernel interface.
2316 static int __init ip6gre_init(void)
2320 pr_info("GRE over IPv6 tunneling driver\n");
2322 err = register_pernet_device(&ip6gre_net_ops);
2326 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2328 pr_info("%s: can't add protocol\n", __func__);
2329 goto add_proto_failed;
2332 err = rtnl_link_register(&ip6gre_link_ops);
2334 goto rtnl_link_failed;
2336 err = rtnl_link_register(&ip6gre_tap_ops);
2338 goto tap_ops_failed;
2340 err = rtnl_link_register(&ip6erspan_tap_ops);
2342 goto erspan_link_failed;
2348 rtnl_link_unregister(&ip6gre_tap_ops);
2350 rtnl_link_unregister(&ip6gre_link_ops);
2352 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2354 unregister_pernet_device(&ip6gre_net_ops);
2358 static void __exit ip6gre_fini(void)
2360 rtnl_link_unregister(&ip6gre_tap_ops);
2361 rtnl_link_unregister(&ip6gre_link_ops);
2362 rtnl_link_unregister(&ip6erspan_tap_ops);
2363 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2364 unregister_pernet_device(&ip6gre_net_ops);
2367 module_init(ip6gre_init);
2368 module_exit(ip6gre_fini);
2369 MODULE_LICENSE("GPL");
2370 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2371 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2372 MODULE_ALIAS_RTNL_LINK("ip6gre");
2373 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2374 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2375 MODULE_ALIAS_NETDEV("ip6gre0");