1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * GRE over IPv6 protocol decoder.
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/in6.h>
24 #include <linux/inetdevice.h>
25 #include <linux/igmp.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/etherdevice.h>
28 #include <linux/if_ether.h>
29 #include <linux/hash.h>
30 #include <linux/if_tunnel.h>
31 #include <linux/ip6_tunnel.h>
35 #include <net/ip_tunnels.h>
37 #include <net/protocol.h>
38 #include <net/addrconf.h>
40 #include <net/checksum.h>
41 #include <net/dsfield.h>
42 #include <net/inet_ecn.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46 #include <net/rtnetlink.h>
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
51 #include <net/ip6_tunnel.h>
53 #include <net/erspan.h>
54 #include <net/dst_metadata.h>
57 static bool log_ecn_error = true;
58 module_param(log_ecn_error, bool, 0644);
59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
61 #define IP6_GRE_HASH_SIZE_SHIFT 5
62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
64 static unsigned int ip6gre_net_id __read_mostly;
66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
68 struct ip6_tnl __rcu *collect_md_tun;
69 struct ip6_tnl __rcu *collect_md_tun_erspan;
70 struct net_device *fb_tunnel_dev;
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80 static void ip6erspan_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))&(IP6_GRE_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, IP6_GRE_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 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130 struct net_device *ndev;
132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
144 if (t->parms.link != link)
146 if (t->dev->type != dev_type)
151 if (score < cand_score) {
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
168 if (t->parms.link != link)
170 if (t->dev->type != dev_type)
175 if (score < cand_score) {
181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
194 if (t->parms.link != link)
196 if (t->dev->type != dev_type)
201 if (score < cand_score) {
207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
217 if (t->parms.link != link)
219 if (t->dev->type != dev_type)
224 if (score < cand_score) {
233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
237 t = rcu_dereference(ign->collect_md_tun);
239 if (t && t->dev->flags & IFF_UP)
242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
257 if (!ipv6_addr_any(local))
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
261 h ^= HASH_ADDR(remote);
264 return &ign->tunnels[prio][h];
267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
295 return __ip6gre_bucket(ign, &t->parms);
298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
315 rcu_assign_pointer(*tp, t->next);
321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
363 strscpy(name, parms->name, IFNAMSIZ);
365 strcpy(name, "ip6gre%d");
367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
372 dev_net_set(dev, net);
374 nt = netdev_priv(dev);
376 dev->rtnl_link_ops = &ip6gre_link_ops;
379 nt->net = dev_net(dev);
381 if (register_netdevice(dev) < 0)
384 ip6gre_tnl_link_config(nt, 1);
385 ip6gre_tunnel_link(ign, nt);
393 static void ip6erspan_tunnel_uninit(struct net_device *dev)
395 struct ip6_tnl *t = netdev_priv(dev);
396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
398 ip6erspan_tunnel_unlink_md(ign, t);
399 ip6gre_tunnel_unlink(ign, t);
400 dst_cache_reset(&t->dst_cache);
401 netdev_put(dev, &t->dev_tracker);
404 static void ip6gre_tunnel_uninit(struct net_device *dev)
406 struct ip6_tnl *t = netdev_priv(dev);
407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
409 ip6gre_tunnel_unlink_md(ign, t);
410 ip6gre_tunnel_unlink(ign, t);
411 if (ign->fb_tunnel_dev == dev)
412 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
413 dst_cache_reset(&t->dst_cache);
414 netdev_put(dev, &t->dev_tracker);
418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
419 u8 type, u8 code, int offset, __be32 info)
421 struct net *net = dev_net(skb->dev);
422 const struct ipv6hdr *ipv6h;
423 struct tnl_ptk_info tpi;
426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
430 ipv6h = (const struct ipv6hdr *)skb->data;
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
437 case ICMPV6_DEST_UNREACH:
438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
440 if (code != ICMPV6_PORT_UNREACH)
443 case ICMPV6_TIME_EXCEED:
444 if (code == ICMPV6_EXC_HOPLIMIT) {
445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
450 case ICMPV6_PARAMPROB: {
451 struct ipv6_tlv_tnl_enc_lim *tel;
455 if (code == ICMPV6_HDR_FIELD)
456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
458 if (teli && teli == be32_to_cpu(info) - 2) {
459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
460 if (tel->encap_limit == 0) {
461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
470 case ICMPV6_PKT_TOOBIG:
471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
474 ip6_redirect(skb, net, skb->dev->ifindex, 0,
475 sock_net_uid(net, NULL));
479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
483 t->err_time = jiffies;
488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
490 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
493 ipv6h = ipv6_hdr(skb);
494 tunnel = ip6gre_tunnel_lookup(skb->dev,
495 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
498 if (tunnel->parms.collect_md) {
499 struct metadata_dst *tun_dst;
504 tun_id = key32_to_tunnel_id(tpi->key);
506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
508 return PACKET_REJECT;
510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
518 return PACKET_REJECT;
521 static int ip6erspan_rcv(struct sk_buff *skb,
522 struct tnl_ptk_info *tpi,
525 struct erspan_base_hdr *ershdr;
526 const struct ipv6hdr *ipv6h;
527 struct erspan_md2 *md2;
528 struct ip6_tnl *tunnel;
531 ipv6h = ipv6_hdr(skb);
532 ershdr = (struct erspan_base_hdr *)skb->data;
535 tunnel = ip6gre_tunnel_lookup(skb->dev,
536 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
539 int len = erspan_hdr_len(ver);
541 if (unlikely(!pskb_may_pull(skb, len)))
542 return PACKET_REJECT;
544 if (__iptunnel_pull_header(skb, len,
547 return PACKET_REJECT;
549 if (tunnel->parms.collect_md) {
550 struct erspan_metadata *pkt_md, *md;
551 struct metadata_dst *tun_dst;
552 struct ip_tunnel_info *info;
557 tpi->flags |= TUNNEL_KEY;
559 tun_id = key32_to_tunnel_id(tpi->key);
561 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
564 return PACKET_REJECT;
566 /* skb can be uncloned in __iptunnel_pull_header, so
567 * old pkt_md is no longer valid and we need to reset
570 gh = skb_network_header(skb) +
571 skb_network_header_len(skb);
572 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
574 info = &tun_dst->u.tun_info;
575 md = ip_tunnel_info_opts(info);
578 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
580 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
581 info->options_len = sizeof(*md);
583 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
586 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
592 return PACKET_REJECT;
595 static int gre_rcv(struct sk_buff *skb)
597 struct tnl_ptk_info tpi;
598 bool csum_err = false;
601 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
605 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
608 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
609 tpi.proto == htons(ETH_P_ERSPAN2))) {
610 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
615 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
619 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
625 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
627 return iptunnel_handle_offloads(skb,
628 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
631 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
632 struct net_device *dev,
633 struct flowi6 *fl6, __u8 *dsfield,
636 const struct iphdr *iph = ip_hdr(skb);
637 struct ip6_tnl *t = netdev_priv(dev);
639 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
640 *encap_limit = t->parms.encap_limit;
642 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
644 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
645 *dsfield = ipv4_get_dsfield(iph);
647 *dsfield = ip6_tclass(t->parms.flowinfo);
649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
650 fl6->flowi6_mark = skb->mark;
652 fl6->flowi6_mark = t->parms.fwmark;
654 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
657 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
658 struct net_device *dev,
659 struct flowi6 *fl6, __u8 *dsfield,
662 struct ipv6hdr *ipv6h;
663 struct ip6_tnl *t = netdev_priv(dev);
666 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
667 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
668 ipv6h = ipv6_hdr(skb);
671 struct ipv6_tlv_tnl_enc_lim *tel;
673 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
674 if (tel->encap_limit == 0) {
675 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
676 ICMPV6_HDR_FIELD, offset + 2);
679 *encap_limit = tel->encap_limit - 1;
680 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
681 *encap_limit = t->parms.encap_limit;
684 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
686 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
687 *dsfield = ipv6_get_dsfield(ipv6h);
689 *dsfield = ip6_tclass(t->parms.flowinfo);
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
692 fl6->flowlabel |= ip6_flowlabel(ipv6h);
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
695 fl6->flowi6_mark = skb->mark;
697 fl6->flowi6_mark = t->parms.fwmark;
699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
704 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
705 struct net_device *dev,
706 struct flowi6 *fl6, __u8 *dsfield,
709 struct ip6_tnl *t = netdev_priv(dev);
711 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
712 *encap_limit = t->parms.encap_limit;
714 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
716 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
719 *dsfield = ip6_tclass(t->parms.flowinfo);
721 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
722 fl6->flowi6_mark = skb->mark;
724 fl6->flowi6_mark = t->parms.fwmark;
726 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
731 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
733 struct ip_tunnel_info *tun_info;
735 tun_info = skb_tunnel_info(skb);
736 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
737 return ERR_PTR(-EINVAL);
742 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
743 struct net_device *dev, __u8 dsfield,
744 struct flowi6 *fl6, int encap_limit,
745 __u32 *pmtu, __be16 proto)
747 struct ip6_tnl *tunnel = netdev_priv(dev);
751 if (dev->type == ARPHRD_ETHER)
752 IPCB(skb)->flags = 0;
754 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
755 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
757 fl6->daddr = tunnel->parms.raddr;
759 /* Push GRE header. */
760 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
762 if (tunnel->parms.collect_md) {
763 struct ip_tunnel_info *tun_info;
764 const struct ip_tunnel_key *key;
767 tun_info = skb_tunnel_info_txcheck(skb);
768 if (IS_ERR(tun_info) ||
769 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
772 key = &tun_info->key;
773 memset(fl6, 0, sizeof(*fl6));
774 fl6->flowi6_proto = IPPROTO_GRE;
775 fl6->daddr = key->u.ipv6.dst;
776 fl6->flowlabel = key->label;
777 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
778 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
781 flags = key->tun_flags &
782 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
783 tun_hlen = gre_calc_hlen(flags);
785 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
788 gre_build_header(skb, tun_hlen,
790 tunnel_id_to_key32(tun_info->key.tun_id),
791 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
795 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
798 flags = tunnel->parms.o_flags;
800 gre_build_header(skb, tunnel->tun_hlen, flags,
801 protocol, tunnel->parms.o_key,
802 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
806 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
810 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
812 struct ip6_tnl *t = netdev_priv(dev);
813 int encap_limit = -1;
819 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
821 if (!t->parms.collect_md)
822 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
823 &dsfield, &encap_limit);
825 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
829 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
832 /* XXX: send ICMP error even if DF is not set. */
833 if (err == -EMSGSIZE)
834 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
842 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
844 struct ip6_tnl *t = netdev_priv(dev);
845 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
846 int encap_limit = -1;
852 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
855 if (!t->parms.collect_md &&
856 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
859 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
862 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
863 &mtu, skb->protocol);
865 if (err == -EMSGSIZE)
866 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
873 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
875 struct ip6_tnl *t = netdev_priv(dev);
876 int encap_limit = -1;
882 if (!t->parms.collect_md &&
883 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
886 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
889 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
894 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
895 struct net_device *dev)
897 struct ip6_tnl *t = netdev_priv(dev);
898 __be16 payload_protocol;
901 if (!pskb_inet_may_pull(skb))
904 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
907 payload_protocol = skb_protocol(skb, true);
908 switch (payload_protocol) {
909 case htons(ETH_P_IP):
910 ret = ip6gre_xmit_ipv4(skb, dev);
912 case htons(ETH_P_IPV6):
913 ret = ip6gre_xmit_ipv6(skb, dev);
916 ret = ip6gre_xmit_other(skb, dev);
926 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
927 DEV_STATS_INC(dev, tx_errors);
928 DEV_STATS_INC(dev, tx_dropped);
933 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
934 struct net_device *dev)
936 struct ip_tunnel_info *tun_info = NULL;
937 struct ip6_tnl *t = netdev_priv(dev);
938 struct dst_entry *dst = skb_dst(skb);
939 bool truncate = false;
940 int encap_limit = -1;
941 __u8 dsfield = false;
948 if (!pskb_inet_may_pull(skb))
951 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
954 if (gre_handle_offloads(skb, false))
957 if (skb->len > dev->mtu + dev->hard_header_len) {
958 pskb_trim(skb, dev->mtu + dev->hard_header_len);
962 nhoff = skb_network_offset(skb);
963 if (skb->protocol == htons(ETH_P_IP) &&
964 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
967 if (skb->protocol == htons(ETH_P_IPV6)) {
970 if (skb_transport_header_was_set(skb))
971 thoff = skb_transport_offset(skb);
973 thoff = nhoff + sizeof(struct ipv6hdr);
974 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
978 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
981 t->parms.o_flags &= ~TUNNEL_KEY;
982 IPCB(skb)->flags = 0;
984 /* For collect_md mode, derive fl6 from the tunnel key,
985 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
987 if (t->parms.collect_md) {
988 const struct ip_tunnel_key *key;
989 struct erspan_metadata *md;
992 tun_info = skb_tunnel_info_txcheck(skb);
993 if (IS_ERR(tun_info) ||
994 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
997 key = &tun_info->key;
998 memset(&fl6, 0, sizeof(fl6));
999 fl6.flowi6_proto = IPPROTO_GRE;
1000 fl6.daddr = key->u.ipv6.dst;
1001 fl6.flowlabel = key->label;
1002 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1003 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1006 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1008 if (tun_info->options_len < sizeof(*md))
1010 md = ip_tunnel_info_opts(tun_info);
1012 tun_id = tunnel_id_to_key32(key->tun_id);
1013 if (md->version == 1) {
1014 erspan_build_header(skb,
1016 ntohl(md->u.index), truncate,
1018 proto = htons(ETH_P_ERSPAN);
1019 } else if (md->version == 2) {
1020 erspan_build_header_v2(skb,
1023 get_hwid(&md->u.md2),
1025 proto = htons(ETH_P_ERSPAN2);
1030 switch (skb->protocol) {
1031 case htons(ETH_P_IP):
1032 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1033 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1034 &dsfield, &encap_limit);
1036 case htons(ETH_P_IPV6):
1037 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1039 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1040 &dsfield, &encap_limit))
1044 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1048 if (t->parms.erspan_ver == 1) {
1049 erspan_build_header(skb, ntohl(t->parms.o_key),
1052 proto = htons(ETH_P_ERSPAN);
1053 } else if (t->parms.erspan_ver == 2) {
1054 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1058 proto = htons(ETH_P_ERSPAN2);
1063 fl6.daddr = t->parms.raddr;
1066 /* Push GRE header. */
1067 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1069 /* TooBig packet may have updated dst->dev's mtu */
1070 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1071 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1073 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1076 /* XXX: send ICMP error even if DF is not set. */
1077 if (err == -EMSGSIZE) {
1078 if (skb->protocol == htons(ETH_P_IP))
1079 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1080 ICMP_FRAG_NEEDED, htonl(mtu));
1082 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1087 return NETDEV_TX_OK;
1090 if (!IS_ERR(tun_info))
1091 DEV_STATS_INC(dev, tx_errors);
1092 DEV_STATS_INC(dev, tx_dropped);
1094 return NETDEV_TX_OK;
1097 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1099 struct net_device *dev = t->dev;
1100 struct __ip6_tnl_parm *p = &t->parms;
1101 struct flowi6 *fl6 = &t->fl.u.ip6;
1103 if (dev->type != ARPHRD_ETHER) {
1104 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1105 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1108 /* Set up flowi template */
1109 fl6->saddr = p->laddr;
1110 fl6->daddr = p->raddr;
1111 fl6->flowi6_oif = p->link;
1113 fl6->flowi6_proto = IPPROTO_GRE;
1114 fl6->fl6_gre_key = t->parms.o_key;
1116 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1117 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1118 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1119 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1121 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1122 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1124 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1125 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1126 dev->flags |= IFF_POINTOPOINT;
1128 dev->flags &= ~IFF_POINTOPOINT;
1131 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1134 const struct __ip6_tnl_parm *p = &t->parms;
1135 struct net_device *dev = t->dev;
1137 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1138 int strict = (ipv6_addr_type(&p->raddr) &
1139 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1141 struct rt6_info *rt = rt6_lookup(t->net,
1142 &p->raddr, &p->laddr,
1143 p->link, NULL, strict);
1149 unsigned short dst_len = rt->dst.dev->hard_header_len +
1152 if (t->dev->header_ops)
1153 dev->hard_header_len = dst_len;
1155 dev->needed_headroom = dst_len;
1158 int mtu = rt->dst.dev->mtu - t_hlen;
1160 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1162 if (dev->type == ARPHRD_ETHER)
1165 if (mtu < IPV6_MIN_MTU)
1167 WRITE_ONCE(dev->mtu, mtu);
1174 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1178 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1179 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1181 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1183 if (tunnel->dev->header_ops)
1184 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1186 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1191 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1193 ip6gre_tnl_link_config_common(t);
1194 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1197 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1198 const struct __ip6_tnl_parm *p)
1200 t->parms.laddr = p->laddr;
1201 t->parms.raddr = p->raddr;
1202 t->parms.flags = p->flags;
1203 t->parms.hop_limit = p->hop_limit;
1204 t->parms.encap_limit = p->encap_limit;
1205 t->parms.flowinfo = p->flowinfo;
1206 t->parms.link = p->link;
1207 t->parms.proto = p->proto;
1208 t->parms.i_key = p->i_key;
1209 t->parms.o_key = p->o_key;
1210 t->parms.i_flags = p->i_flags;
1211 t->parms.o_flags = p->o_flags;
1212 t->parms.fwmark = p->fwmark;
1213 t->parms.erspan_ver = p->erspan_ver;
1214 t->parms.index = p->index;
1215 t->parms.dir = p->dir;
1216 t->parms.hwid = p->hwid;
1217 dst_cache_reset(&t->dst_cache);
1220 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1223 ip6gre_tnl_copy_tnl_parm(t, p);
1224 ip6gre_tnl_link_config(t, set_mtu);
1228 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1229 const struct ip6_tnl_parm2 *u)
1231 p->laddr = u->laddr;
1232 p->raddr = u->raddr;
1233 p->flags = u->flags;
1234 p->hop_limit = u->hop_limit;
1235 p->encap_limit = u->encap_limit;
1236 p->flowinfo = u->flowinfo;
1238 p->i_key = u->i_key;
1239 p->o_key = u->o_key;
1240 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1241 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1242 memcpy(p->name, u->name, sizeof(u->name));
1245 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1246 const struct __ip6_tnl_parm *p)
1248 u->proto = IPPROTO_GRE;
1249 u->laddr = p->laddr;
1250 u->raddr = p->raddr;
1251 u->flags = p->flags;
1252 u->hop_limit = p->hop_limit;
1253 u->encap_limit = p->encap_limit;
1254 u->flowinfo = p->flowinfo;
1256 u->i_key = p->i_key;
1257 u->o_key = p->o_key;
1258 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1259 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1260 memcpy(u->name, p->name, sizeof(u->name));
1263 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1264 struct ifreq *ifr, void __user *data,
1268 struct ip6_tnl_parm2 p;
1269 struct __ip6_tnl_parm p1;
1270 struct ip6_tnl *t = netdev_priv(dev);
1271 struct net *net = t->net;
1272 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1274 memset(&p1, 0, sizeof(p1));
1278 if (dev == ign->fb_tunnel_dev) {
1279 if (copy_from_user(&p, data, sizeof(p))) {
1283 ip6gre_tnl_parm_from_user(&p1, &p);
1284 t = ip6gre_tunnel_locate(net, &p1, 0);
1286 t = netdev_priv(dev);
1288 memset(&p, 0, sizeof(p));
1289 ip6gre_tnl_parm_to_user(&p, &t->parms);
1290 if (copy_to_user(data, &p, sizeof(p)))
1297 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1301 if (copy_from_user(&p, data, sizeof(p)))
1305 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1308 if (!(p.i_flags&GRE_KEY))
1310 if (!(p.o_flags&GRE_KEY))
1313 ip6gre_tnl_parm_from_user(&p1, &p);
1314 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1316 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1318 if (t->dev != dev) {
1323 t = netdev_priv(dev);
1325 ip6gre_tunnel_unlink(ign, t);
1327 ip6gre_tnl_change(t, &p1, 1);
1328 ip6gre_tunnel_link(ign, t);
1329 netdev_state_change(dev);
1336 memset(&p, 0, sizeof(p));
1337 ip6gre_tnl_parm_to_user(&p, &t->parms);
1338 if (copy_to_user(data, &p, sizeof(p)))
1341 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1346 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1349 if (dev == ign->fb_tunnel_dev) {
1351 if (copy_from_user(&p, data, sizeof(p)))
1354 ip6gre_tnl_parm_from_user(&p1, &p);
1355 t = ip6gre_tunnel_locate(net, &p1, 0);
1359 if (t == netdev_priv(ign->fb_tunnel_dev))
1363 unregister_netdevice(dev);
1375 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1376 unsigned short type, const void *daddr,
1377 const void *saddr, unsigned int len)
1379 struct ip6_tnl *t = netdev_priv(dev);
1380 struct ipv6hdr *ipv6h;
1383 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1384 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1385 t->fl.u.ip6.flowlabel,
1386 true, &t->fl.u.ip6));
1387 ipv6h->hop_limit = t->parms.hop_limit;
1388 ipv6h->nexthdr = NEXTHDR_GRE;
1389 ipv6h->saddr = t->parms.laddr;
1390 ipv6h->daddr = t->parms.raddr;
1392 p = (__be16 *)(ipv6h + 1);
1393 p[0] = t->parms.o_flags;
1397 * Set the source hardware address.
1401 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1403 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1404 if (!ipv6_addr_any(&ipv6h->daddr))
1410 static const struct header_ops ip6gre_header_ops = {
1411 .create = ip6gre_header,
1414 static const struct net_device_ops ip6gre_netdev_ops = {
1415 .ndo_init = ip6gre_tunnel_init,
1416 .ndo_uninit = ip6gre_tunnel_uninit,
1417 .ndo_start_xmit = ip6gre_tunnel_xmit,
1418 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1419 .ndo_change_mtu = ip6_tnl_change_mtu,
1420 .ndo_get_stats64 = dev_get_tstats64,
1421 .ndo_get_iflink = ip6_tnl_get_iflink,
1424 static void ip6gre_dev_free(struct net_device *dev)
1426 struct ip6_tnl *t = netdev_priv(dev);
1428 gro_cells_destroy(&t->gro_cells);
1429 dst_cache_destroy(&t->dst_cache);
1430 free_percpu(dev->tstats);
1433 static void ip6gre_tunnel_setup(struct net_device *dev)
1435 dev->netdev_ops = &ip6gre_netdev_ops;
1436 dev->needs_free_netdev = true;
1437 dev->priv_destructor = ip6gre_dev_free;
1439 dev->type = ARPHRD_IP6GRE;
1441 dev->flags |= IFF_NOARP;
1442 dev->addr_len = sizeof(struct in6_addr);
1443 netif_keep_dst(dev);
1444 /* This perm addr will be used as interface identifier by IPv6 */
1445 dev->addr_assign_type = NET_ADDR_RANDOM;
1446 eth_random_addr(dev->perm_addr);
1449 #define GRE6_FEATURES (NETIF_F_SG | \
1450 NETIF_F_FRAGLIST | \
1454 static void ip6gre_tnl_init_features(struct net_device *dev)
1456 struct ip6_tnl *nt = netdev_priv(dev);
1459 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1460 dev->hw_features |= GRE6_FEATURES;
1462 flags = nt->parms.o_flags;
1464 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1465 * levels of outer headers requiring an update.
1467 if (flags & TUNNEL_SEQ)
1469 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1472 dev->features |= NETIF_F_GSO_SOFTWARE;
1473 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1476 static int ip6gre_tunnel_init_common(struct net_device *dev)
1478 struct ip6_tnl *tunnel;
1482 tunnel = netdev_priv(dev);
1485 tunnel->net = dev_net(dev);
1486 strcpy(tunnel->parms.name, dev->name);
1488 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1492 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1494 goto cleanup_alloc_pcpu_stats;
1496 ret = gro_cells_init(&tunnel->gro_cells, dev);
1498 goto cleanup_dst_cache_init;
1500 t_hlen = ip6gre_calc_hlen(tunnel);
1501 dev->mtu = ETH_DATA_LEN - t_hlen;
1502 if (dev->type == ARPHRD_ETHER)
1503 dev->mtu -= ETH_HLEN;
1504 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1507 if (tunnel->parms.collect_md) {
1508 netif_keep_dst(dev);
1510 ip6gre_tnl_init_features(dev);
1512 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1515 cleanup_dst_cache_init:
1516 dst_cache_destroy(&tunnel->dst_cache);
1517 cleanup_alloc_pcpu_stats:
1518 free_percpu(dev->tstats);
1523 static int ip6gre_tunnel_init(struct net_device *dev)
1525 struct ip6_tnl *tunnel;
1528 ret = ip6gre_tunnel_init_common(dev);
1532 tunnel = netdev_priv(dev);
1534 if (tunnel->parms.collect_md)
1537 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1538 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1540 if (ipv6_addr_any(&tunnel->parms.raddr))
1541 dev->header_ops = &ip6gre_header_ops;
1546 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1548 struct ip6_tnl *tunnel = netdev_priv(dev);
1551 tunnel->net = dev_net(dev);
1552 strcpy(tunnel->parms.name, dev->name);
1554 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1557 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1559 .err_handler = ip6gre_err,
1560 .flags = INET6_PROTO_FINAL,
1563 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1565 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1566 struct net_device *dev, *aux;
1569 for_each_netdev_safe(net, dev, aux)
1570 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1571 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1572 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1573 unregister_netdevice_queue(dev, head);
1575 for (prio = 0; prio < 4; prio++) {
1577 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1580 t = rtnl_dereference(ign->tunnels[prio][h]);
1583 /* If dev is in the same netns, it has already
1584 * been added to the list by the previous loop.
1586 if (!net_eq(dev_net(t->dev), net))
1587 unregister_netdevice_queue(t->dev,
1589 t = rtnl_dereference(t->next);
1595 static int __net_init ip6gre_init_net(struct net *net)
1597 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1598 struct net_device *ndev;
1601 if (!net_has_fallback_tunnels(net))
1603 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1604 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1609 ign->fb_tunnel_dev = ndev;
1610 dev_net_set(ign->fb_tunnel_dev, net);
1611 /* FB netdevice is special: we have one, and only one per netns.
1612 * Allowing to move it to another netns is clearly unsafe.
1614 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1617 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1618 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1620 err = register_netdev(ign->fb_tunnel_dev);
1624 rcu_assign_pointer(ign->tunnels_wc[0],
1625 netdev_priv(ign->fb_tunnel_dev));
1634 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1640 list_for_each_entry(net, net_list, exit_list)
1641 ip6gre_destroy_tunnels(net, &list);
1642 unregister_netdevice_many(&list);
1646 static struct pernet_operations ip6gre_net_ops = {
1647 .init = ip6gre_init_net,
1648 .exit_batch = ip6gre_exit_batch_net,
1649 .id = &ip6gre_net_id,
1650 .size = sizeof(struct ip6gre_net),
1653 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1654 struct netlink_ext_ack *extack)
1662 if (data[IFLA_GRE_IFLAGS])
1663 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1664 if (data[IFLA_GRE_OFLAGS])
1665 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1666 if (flags & (GRE_VERSION|GRE_ROUTING))
1672 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1673 struct netlink_ext_ack *extack)
1675 struct in6_addr daddr;
1677 if (tb[IFLA_ADDRESS]) {
1678 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1680 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1681 return -EADDRNOTAVAIL;
1687 if (data[IFLA_GRE_REMOTE]) {
1688 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1689 if (ipv6_addr_any(&daddr))
1694 return ip6gre_tunnel_validate(tb, data, extack);
1697 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1698 struct netlink_ext_ack *extack)
1706 ret = ip6gre_tap_validate(tb, data, extack);
1710 /* ERSPAN should only have GRE sequence and key flag */
1711 if (data[IFLA_GRE_OFLAGS])
1712 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1713 if (data[IFLA_GRE_IFLAGS])
1714 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1715 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1716 flags != (GRE_SEQ | GRE_KEY))
1719 /* ERSPAN Session ID only has 10-bit. Since we reuse
1720 * 32-bit key field as ID, check it's range.
1722 if (data[IFLA_GRE_IKEY] &&
1723 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1726 if (data[IFLA_GRE_OKEY] &&
1727 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1730 if (data[IFLA_GRE_ERSPAN_VER]) {
1731 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1732 if (ver != 1 && ver != 2)
1737 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1738 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1740 if (index & ~INDEX_MASK)
1743 } else if (ver == 2) {
1744 if (data[IFLA_GRE_ERSPAN_DIR]) {
1745 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1747 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1751 if (data[IFLA_GRE_ERSPAN_HWID]) {
1752 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1754 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1762 static void ip6erspan_set_version(struct nlattr *data[],
1763 struct __ip6_tnl_parm *parms)
1768 parms->erspan_ver = 1;
1769 if (data[IFLA_GRE_ERSPAN_VER])
1770 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1772 if (parms->erspan_ver == 1) {
1773 if (data[IFLA_GRE_ERSPAN_INDEX])
1774 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1775 } else if (parms->erspan_ver == 2) {
1776 if (data[IFLA_GRE_ERSPAN_DIR])
1777 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1778 if (data[IFLA_GRE_ERSPAN_HWID])
1779 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1783 static void ip6gre_netlink_parms(struct nlattr *data[],
1784 struct __ip6_tnl_parm *parms)
1786 memset(parms, 0, sizeof(*parms));
1791 if (data[IFLA_GRE_LINK])
1792 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1794 if (data[IFLA_GRE_IFLAGS])
1795 parms->i_flags = gre_flags_to_tnl_flags(
1796 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1798 if (data[IFLA_GRE_OFLAGS])
1799 parms->o_flags = gre_flags_to_tnl_flags(
1800 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1802 if (data[IFLA_GRE_IKEY])
1803 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1805 if (data[IFLA_GRE_OKEY])
1806 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1808 if (data[IFLA_GRE_LOCAL])
1809 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1811 if (data[IFLA_GRE_REMOTE])
1812 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1814 if (data[IFLA_GRE_TTL])
1815 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1817 if (data[IFLA_GRE_ENCAP_LIMIT])
1818 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1820 if (data[IFLA_GRE_FLOWINFO])
1821 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1823 if (data[IFLA_GRE_FLAGS])
1824 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1826 if (data[IFLA_GRE_FWMARK])
1827 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1829 if (data[IFLA_GRE_COLLECT_METADATA])
1830 parms->collect_md = true;
1833 static int ip6gre_tap_init(struct net_device *dev)
1837 ret = ip6gre_tunnel_init_common(dev);
1841 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1846 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1847 .ndo_init = ip6gre_tap_init,
1848 .ndo_uninit = ip6gre_tunnel_uninit,
1849 .ndo_start_xmit = ip6gre_tunnel_xmit,
1850 .ndo_set_mac_address = eth_mac_addr,
1851 .ndo_validate_addr = eth_validate_addr,
1852 .ndo_change_mtu = ip6_tnl_change_mtu,
1853 .ndo_get_stats64 = dev_get_tstats64,
1854 .ndo_get_iflink = ip6_tnl_get_iflink,
1857 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1861 tunnel->tun_hlen = 8;
1862 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1863 erspan_hdr_len(tunnel->parms.erspan_ver);
1865 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1866 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1870 static int ip6erspan_tap_init(struct net_device *dev)
1872 struct ip6_tnl *tunnel;
1876 tunnel = netdev_priv(dev);
1879 tunnel->net = dev_net(dev);
1880 strcpy(tunnel->parms.name, dev->name);
1882 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1886 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1888 goto cleanup_alloc_pcpu_stats;
1890 ret = gro_cells_init(&tunnel->gro_cells, dev);
1892 goto cleanup_dst_cache_init;
1894 t_hlen = ip6erspan_calc_hlen(tunnel);
1895 dev->mtu = ETH_DATA_LEN - t_hlen;
1896 if (dev->type == ARPHRD_ETHER)
1897 dev->mtu -= ETH_HLEN;
1898 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1901 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1902 ip6erspan_tnl_link_config(tunnel, 1);
1904 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1907 cleanup_dst_cache_init:
1908 dst_cache_destroy(&tunnel->dst_cache);
1909 cleanup_alloc_pcpu_stats:
1910 free_percpu(dev->tstats);
1915 static const struct net_device_ops ip6erspan_netdev_ops = {
1916 .ndo_init = ip6erspan_tap_init,
1917 .ndo_uninit = ip6erspan_tunnel_uninit,
1918 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1919 .ndo_set_mac_address = eth_mac_addr,
1920 .ndo_validate_addr = eth_validate_addr,
1921 .ndo_change_mtu = ip6_tnl_change_mtu,
1922 .ndo_get_stats64 = dev_get_tstats64,
1923 .ndo_get_iflink = ip6_tnl_get_iflink,
1926 static void ip6gre_tap_setup(struct net_device *dev)
1932 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1933 dev->needs_free_netdev = true;
1934 dev->priv_destructor = ip6gre_dev_free;
1936 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1937 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1938 netif_keep_dst(dev);
1941 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1942 struct ip_tunnel_encap *ipencap)
1946 memset(ipencap, 0, sizeof(*ipencap));
1951 if (data[IFLA_GRE_ENCAP_TYPE]) {
1953 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1956 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1958 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1961 if (data[IFLA_GRE_ENCAP_SPORT]) {
1963 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1966 if (data[IFLA_GRE_ENCAP_DPORT]) {
1968 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1974 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1975 struct nlattr *tb[], struct nlattr *data[],
1976 struct netlink_ext_ack *extack)
1979 struct ip_tunnel_encap ipencap;
1982 nt = netdev_priv(dev);
1984 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1985 int err = ip6_tnl_encap_setup(nt, &ipencap);
1991 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1992 eth_hw_addr_random(dev);
1995 nt->net = dev_net(dev);
1997 err = register_netdevice(dev);
2002 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2008 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2009 struct nlattr *tb[], struct nlattr *data[],
2010 struct netlink_ext_ack *extack)
2012 struct ip6_tnl *nt = netdev_priv(dev);
2013 struct net *net = dev_net(dev);
2014 struct ip6gre_net *ign;
2017 ip6gre_netlink_parms(data, &nt->parms);
2018 ign = net_generic(net, ip6gre_net_id);
2020 if (nt->parms.collect_md) {
2021 if (rtnl_dereference(ign->collect_md_tun))
2024 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2028 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2030 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2031 ip6gre_tunnel_link_md(ign, nt);
2032 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2037 static struct ip6_tnl *
2038 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2039 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2040 struct netlink_ext_ack *extack)
2042 struct ip6_tnl *t, *nt = netdev_priv(dev);
2043 struct net *net = nt->net;
2044 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2045 struct ip_tunnel_encap ipencap;
2047 if (dev == ign->fb_tunnel_dev)
2048 return ERR_PTR(-EINVAL);
2050 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2051 int err = ip6_tnl_encap_setup(nt, &ipencap);
2054 return ERR_PTR(err);
2057 ip6gre_netlink_parms(data, p_p);
2059 t = ip6gre_tunnel_locate(net, p_p, 0);
2063 return ERR_PTR(-EEXIST);
2071 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2072 struct nlattr *data[],
2073 struct netlink_ext_ack *extack)
2075 struct ip6_tnl *t = netdev_priv(dev);
2076 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2077 struct __ip6_tnl_parm p;
2079 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2083 ip6gre_tunnel_unlink_md(ign, t);
2084 ip6gre_tunnel_unlink(ign, t);
2085 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2086 ip6gre_tunnel_link_md(ign, t);
2087 ip6gre_tunnel_link(ign, t);
2091 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2093 struct net *net = dev_net(dev);
2094 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2096 if (dev != ign->fb_tunnel_dev)
2097 unregister_netdevice_queue(dev, head);
2100 static size_t ip6gre_get_size(const struct net_device *dev)
2105 /* IFLA_GRE_IFLAGS */
2107 /* IFLA_GRE_OFLAGS */
2113 /* IFLA_GRE_LOCAL */
2114 nla_total_size(sizeof(struct in6_addr)) +
2115 /* IFLA_GRE_REMOTE */
2116 nla_total_size(sizeof(struct in6_addr)) +
2119 /* IFLA_GRE_ENCAP_LIMIT */
2121 /* IFLA_GRE_FLOWINFO */
2123 /* IFLA_GRE_FLAGS */
2125 /* IFLA_GRE_ENCAP_TYPE */
2127 /* IFLA_GRE_ENCAP_FLAGS */
2129 /* IFLA_GRE_ENCAP_SPORT */
2131 /* IFLA_GRE_ENCAP_DPORT */
2133 /* IFLA_GRE_COLLECT_METADATA */
2135 /* IFLA_GRE_FWMARK */
2137 /* IFLA_GRE_ERSPAN_INDEX */
2142 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2144 struct ip6_tnl *t = netdev_priv(dev);
2145 struct __ip6_tnl_parm *p = &t->parms;
2146 __be16 o_flags = p->o_flags;
2148 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2150 o_flags |= TUNNEL_KEY;
2152 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2153 goto nla_put_failure;
2155 if (p->erspan_ver == 1) {
2156 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2157 goto nla_put_failure;
2159 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2160 goto nla_put_failure;
2161 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2162 goto nla_put_failure;
2166 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2167 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2168 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2169 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2170 gre_tnl_flags_to_gre_flags(o_flags)) ||
2171 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2172 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2173 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2174 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2175 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2176 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2177 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2178 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2179 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2180 goto nla_put_failure;
2182 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2184 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2186 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2188 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2190 goto nla_put_failure;
2192 if (p->collect_md) {
2193 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2194 goto nla_put_failure;
2203 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2204 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2205 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2206 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2207 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2208 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2209 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2210 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2211 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2212 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2213 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2214 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2215 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2216 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2217 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2218 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2219 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2220 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2221 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2222 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2223 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2224 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2227 static void ip6erspan_tap_setup(struct net_device *dev)
2232 dev->netdev_ops = &ip6erspan_netdev_ops;
2233 dev->needs_free_netdev = true;
2234 dev->priv_destructor = ip6gre_dev_free;
2236 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2237 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2238 netif_keep_dst(dev);
2241 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2242 struct nlattr *tb[], struct nlattr *data[],
2243 struct netlink_ext_ack *extack)
2245 struct ip6_tnl *nt = netdev_priv(dev);
2246 struct net *net = dev_net(dev);
2247 struct ip6gre_net *ign;
2250 ip6gre_netlink_parms(data, &nt->parms);
2251 ip6erspan_set_version(data, &nt->parms);
2252 ign = net_generic(net, ip6gre_net_id);
2254 if (nt->parms.collect_md) {
2255 if (rtnl_dereference(ign->collect_md_tun_erspan))
2258 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2262 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2264 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2265 ip6erspan_tunnel_link_md(ign, nt);
2266 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2271 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2273 ip6gre_tnl_link_config_common(t);
2274 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2277 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2278 const struct __ip6_tnl_parm *p, int set_mtu)
2280 ip6gre_tnl_copy_tnl_parm(t, p);
2281 ip6erspan_tnl_link_config(t, set_mtu);
2285 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2286 struct nlattr *data[],
2287 struct netlink_ext_ack *extack)
2289 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2290 struct __ip6_tnl_parm p;
2293 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2297 ip6erspan_set_version(data, &p);
2298 ip6gre_tunnel_unlink_md(ign, t);
2299 ip6gre_tunnel_unlink(ign, t);
2300 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2301 ip6erspan_tunnel_link_md(ign, t);
2302 ip6gre_tunnel_link(ign, t);
2306 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2308 .maxtype = IFLA_GRE_MAX,
2309 .policy = ip6gre_policy,
2310 .priv_size = sizeof(struct ip6_tnl),
2311 .setup = ip6gre_tunnel_setup,
2312 .validate = ip6gre_tunnel_validate,
2313 .newlink = ip6gre_newlink,
2314 .changelink = ip6gre_changelink,
2315 .dellink = ip6gre_dellink,
2316 .get_size = ip6gre_get_size,
2317 .fill_info = ip6gre_fill_info,
2318 .get_link_net = ip6_tnl_get_link_net,
2321 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2322 .kind = "ip6gretap",
2323 .maxtype = IFLA_GRE_MAX,
2324 .policy = ip6gre_policy,
2325 .priv_size = sizeof(struct ip6_tnl),
2326 .setup = ip6gre_tap_setup,
2327 .validate = ip6gre_tap_validate,
2328 .newlink = ip6gre_newlink,
2329 .changelink = ip6gre_changelink,
2330 .get_size = ip6gre_get_size,
2331 .fill_info = ip6gre_fill_info,
2332 .get_link_net = ip6_tnl_get_link_net,
2335 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2336 .kind = "ip6erspan",
2337 .maxtype = IFLA_GRE_MAX,
2338 .policy = ip6gre_policy,
2339 .priv_size = sizeof(struct ip6_tnl),
2340 .setup = ip6erspan_tap_setup,
2341 .validate = ip6erspan_tap_validate,
2342 .newlink = ip6erspan_newlink,
2343 .changelink = ip6erspan_changelink,
2344 .get_size = ip6gre_get_size,
2345 .fill_info = ip6gre_fill_info,
2346 .get_link_net = ip6_tnl_get_link_net,
2350 * And now the modules code and kernel interface.
2353 static int __init ip6gre_init(void)
2357 pr_info("GRE over IPv6 tunneling driver\n");
2359 err = register_pernet_device(&ip6gre_net_ops);
2363 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365 pr_info("%s: can't add protocol\n", __func__);
2366 goto add_proto_failed;
2369 err = rtnl_link_register(&ip6gre_link_ops);
2371 goto rtnl_link_failed;
2373 err = rtnl_link_register(&ip6gre_tap_ops);
2375 goto tap_ops_failed;
2377 err = rtnl_link_register(&ip6erspan_tap_ops);
2379 goto erspan_link_failed;
2385 rtnl_link_unregister(&ip6gre_tap_ops);
2387 rtnl_link_unregister(&ip6gre_link_ops);
2389 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2391 unregister_pernet_device(&ip6gre_net_ops);
2395 static void __exit ip6gre_fini(void)
2397 rtnl_link_unregister(&ip6gre_tap_ops);
2398 rtnl_link_unregister(&ip6gre_link_ops);
2399 rtnl_link_unregister(&ip6erspan_tap_ops);
2400 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2401 unregister_pernet_device(&ip6gre_net_ops);
2404 module_init(ip6gre_init);
2405 module_exit(ip6gre_fini);
2406 MODULE_LICENSE("GPL");
2407 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2408 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2409 MODULE_ALIAS_RTNL_LINK("ip6gre");
2410 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2411 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2412 MODULE_ALIAS_NETDEV("ip6gre0");