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 strlcpy(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);
386 /* Can use a lockless transmit, unless we generate output sequences */
387 if (!(nt->parms.o_flags & TUNNEL_SEQ))
388 dev->features |= NETIF_F_LLTX;
390 ip6gre_tunnel_link(ign, nt);
398 static void ip6erspan_tunnel_uninit(struct net_device *dev)
400 struct ip6_tnl *t = netdev_priv(dev);
401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
403 ip6erspan_tunnel_unlink_md(ign, t);
404 ip6gre_tunnel_unlink(ign, t);
405 dst_cache_reset(&t->dst_cache);
409 static void ip6gre_tunnel_uninit(struct net_device *dev)
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
414 ip6gre_tunnel_unlink_md(ign, t);
415 ip6gre_tunnel_unlink(ign, t);
416 if (ign->fb_tunnel_dev == dev)
417 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
418 dst_cache_reset(&t->dst_cache);
423 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
424 u8 type, u8 code, int offset, __be32 info)
426 struct net *net = dev_net(skb->dev);
427 const struct ipv6hdr *ipv6h;
428 struct tnl_ptk_info tpi;
431 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
435 ipv6h = (const struct ipv6hdr *)skb->data;
436 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
442 struct ipv6_tlv_tnl_enc_lim *tel;
444 case ICMPV6_DEST_UNREACH:
445 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
447 if (code != ICMPV6_PORT_UNREACH)
450 case ICMPV6_TIME_EXCEED:
451 if (code == ICMPV6_EXC_HOPLIMIT) {
452 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
457 case ICMPV6_PARAMPROB:
459 if (code == ICMPV6_HDR_FIELD)
460 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
462 if (teli && teli == be32_to_cpu(info) - 2) {
463 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
464 if (tel->encap_limit == 0) {
465 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
469 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
473 case ICMPV6_PKT_TOOBIG:
474 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
477 ip6_redirect(skb, net, skb->dev->ifindex, 0,
478 sock_net_uid(net, NULL));
482 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
486 t->err_time = jiffies;
491 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
493 const struct ipv6hdr *ipv6h;
494 struct ip6_tnl *tunnel;
496 ipv6h = ipv6_hdr(skb);
497 tunnel = ip6gre_tunnel_lookup(skb->dev,
498 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
501 if (tunnel->parms.collect_md) {
502 struct metadata_dst *tun_dst;
507 tun_id = key32_to_tunnel_id(tpi->key);
509 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
511 return PACKET_REJECT;
513 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
515 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
521 return PACKET_REJECT;
524 static int ip6erspan_rcv(struct sk_buff *skb,
525 struct tnl_ptk_info *tpi,
528 struct erspan_base_hdr *ershdr;
529 const struct ipv6hdr *ipv6h;
530 struct erspan_md2 *md2;
531 struct ip6_tnl *tunnel;
534 ipv6h = ipv6_hdr(skb);
535 ershdr = (struct erspan_base_hdr *)skb->data;
538 tunnel = ip6gre_tunnel_lookup(skb->dev,
539 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
542 int len = erspan_hdr_len(ver);
544 if (unlikely(!pskb_may_pull(skb, len)))
545 return PACKET_REJECT;
547 if (__iptunnel_pull_header(skb, len,
550 return PACKET_REJECT;
552 if (tunnel->parms.collect_md) {
553 struct erspan_metadata *pkt_md, *md;
554 struct metadata_dst *tun_dst;
555 struct ip_tunnel_info *info;
560 tpi->flags |= TUNNEL_KEY;
562 tun_id = key32_to_tunnel_id(tpi->key);
564 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
567 return PACKET_REJECT;
569 /* skb can be uncloned in __iptunnel_pull_header, so
570 * old pkt_md is no longer valid and we need to reset
573 gh = skb_network_header(skb) +
574 skb_network_header_len(skb);
575 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
577 info = &tun_dst->u.tun_info;
578 md = ip_tunnel_info_opts(info);
581 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
583 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
584 info->options_len = sizeof(*md);
586 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
589 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
595 return PACKET_REJECT;
598 static int gre_rcv(struct sk_buff *skb)
600 struct tnl_ptk_info tpi;
601 bool csum_err = false;
604 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
608 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
611 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
612 tpi.proto == htons(ETH_P_ERSPAN2))) {
613 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
618 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
622 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
628 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
630 return iptunnel_handle_offloads(skb,
631 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
634 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
635 struct net_device *dev,
636 struct flowi6 *fl6, __u8 *dsfield,
639 const struct iphdr *iph = ip_hdr(skb);
640 struct ip6_tnl *t = netdev_priv(dev);
642 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
643 *encap_limit = t->parms.encap_limit;
645 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
647 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
648 *dsfield = ipv4_get_dsfield(iph);
650 *dsfield = ip6_tclass(t->parms.flowinfo);
652 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
653 fl6->flowi6_mark = skb->mark;
655 fl6->flowi6_mark = t->parms.fwmark;
657 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
660 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
661 struct net_device *dev,
662 struct flowi6 *fl6, __u8 *dsfield,
665 struct ipv6hdr *ipv6h;
666 struct ip6_tnl *t = netdev_priv(dev);
669 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
670 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
671 ipv6h = ipv6_hdr(skb);
674 struct ipv6_tlv_tnl_enc_lim *tel;
676 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
677 if (tel->encap_limit == 0) {
678 icmpv6_send(skb, ICMPV6_PARAMPROB,
679 ICMPV6_HDR_FIELD, offset + 2);
682 *encap_limit = tel->encap_limit - 1;
683 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
684 *encap_limit = t->parms.encap_limit;
687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
690 *dsfield = ipv6_get_dsfield(ipv6h);
692 *dsfield = ip6_tclass(t->parms.flowinfo);
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
695 fl6->flowlabel |= ip6_flowlabel(ipv6h);
697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
698 fl6->flowi6_mark = skb->mark;
700 fl6->flowi6_mark = t->parms.fwmark;
702 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
707 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
708 struct net_device *dev, __u8 dsfield,
709 struct flowi6 *fl6, int encap_limit,
710 __u32 *pmtu, __be16 proto)
712 struct ip6_tnl *tunnel = netdev_priv(dev);
715 if (dev->type == ARPHRD_ETHER)
716 IPCB(skb)->flags = 0;
718 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
719 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
721 fl6->daddr = tunnel->parms.raddr;
723 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
726 /* Push GRE header. */
727 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
729 if (tunnel->parms.collect_md) {
730 struct ip_tunnel_info *tun_info;
731 const struct ip_tunnel_key *key;
735 tun_info = skb_tunnel_info(skb);
736 if (unlikely(!tun_info ||
737 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
738 ip_tunnel_info_af(tun_info) != AF_INET6))
741 key = &tun_info->key;
742 memset(fl6, 0, sizeof(*fl6));
743 fl6->flowi6_proto = IPPROTO_GRE;
744 fl6->daddr = key->u.ipv6.dst;
745 fl6->flowlabel = key->label;
746 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
747 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
750 flags = key->tun_flags &
751 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
752 tun_hlen = gre_calc_hlen(flags);
754 gre_build_header(skb, tun_hlen,
756 tunnel_id_to_key32(tun_info->key.tun_id),
757 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
761 if (tunnel->parms.o_flags & TUNNEL_SEQ)
764 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
765 protocol, tunnel->parms.o_key,
766 htonl(tunnel->o_seqno));
769 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
773 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
775 struct ip6_tnl *t = netdev_priv(dev);
776 int encap_limit = -1;
782 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
784 if (!t->parms.collect_md)
785 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
786 &dsfield, &encap_limit);
788 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
792 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
795 /* XXX: send ICMP error even if DF is not set. */
796 if (err == -EMSGSIZE)
797 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
805 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
807 struct ip6_tnl *t = netdev_priv(dev);
808 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
809 int encap_limit = -1;
815 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
818 if (!t->parms.collect_md &&
819 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
822 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
825 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
826 &mtu, skb->protocol);
828 if (err == -EMSGSIZE)
829 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
837 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
838 * @t: the outgoing tunnel device
839 * @hdr: IPv6 header from the incoming packet
842 * Avoid trivial tunneling loop by checking that tunnel exit-point
843 * doesn't match source of incoming packet.
850 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
851 const struct ipv6hdr *hdr)
853 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
856 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
858 struct ip6_tnl *t = netdev_priv(dev);
859 int encap_limit = -1;
864 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
865 encap_limit = t->parms.encap_limit;
867 if (!t->parms.collect_md)
868 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
870 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
874 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
879 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
880 struct net_device *dev)
882 struct ip6_tnl *t = netdev_priv(dev);
883 struct net_device_stats *stats = &t->dev->stats;
886 if (!pskb_inet_may_pull(skb))
889 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
892 switch (skb->protocol) {
893 case htons(ETH_P_IP):
894 ret = ip6gre_xmit_ipv4(skb, dev);
896 case htons(ETH_P_IPV6):
897 ret = ip6gre_xmit_ipv6(skb, dev);
900 ret = ip6gre_xmit_other(skb, dev);
916 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
917 struct net_device *dev)
919 struct ip6_tnl *t = netdev_priv(dev);
920 struct dst_entry *dst = skb_dst(skb);
921 struct net_device_stats *stats;
922 bool truncate = false;
923 int encap_limit = -1;
924 __u8 dsfield = false;
931 if (!pskb_inet_may_pull(skb))
934 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
937 if (gre_handle_offloads(skb, false))
940 if (skb->len > dev->mtu + dev->hard_header_len) {
941 pskb_trim(skb, dev->mtu + dev->hard_header_len);
945 nhoff = skb_network_header(skb) - skb_mac_header(skb);
946 if (skb->protocol == htons(ETH_P_IP) &&
947 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
950 if (skb->protocol == htons(ETH_P_IPV6)) {
953 if (skb_transport_header_was_set(skb))
954 thoff = skb_transport_header(skb) - skb_mac_header(skb);
956 thoff = nhoff + sizeof(struct ipv6hdr);
957 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
961 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
964 t->parms.o_flags &= ~TUNNEL_KEY;
965 IPCB(skb)->flags = 0;
967 /* For collect_md mode, derive fl6 from the tunnel key,
968 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
970 if (t->parms.collect_md) {
971 struct ip_tunnel_info *tun_info;
972 const struct ip_tunnel_key *key;
973 struct erspan_metadata *md;
976 tun_info = skb_tunnel_info(skb);
977 if (unlikely(!tun_info ||
978 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
979 ip_tunnel_info_af(tun_info) != AF_INET6))
982 key = &tun_info->key;
983 memset(&fl6, 0, sizeof(fl6));
984 fl6.flowi6_proto = IPPROTO_GRE;
985 fl6.daddr = key->u.ipv6.dst;
986 fl6.flowlabel = key->label;
987 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
988 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
991 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
993 if (tun_info->options_len < sizeof(*md))
995 md = ip_tunnel_info_opts(tun_info);
997 tun_id = tunnel_id_to_key32(key->tun_id);
998 if (md->version == 1) {
999 erspan_build_header(skb,
1001 ntohl(md->u.index), truncate,
1003 } else if (md->version == 2) {
1004 erspan_build_header_v2(skb,
1007 get_hwid(&md->u.md2),
1013 switch (skb->protocol) {
1014 case htons(ETH_P_IP):
1015 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1016 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1017 &dsfield, &encap_limit);
1019 case htons(ETH_P_IPV6):
1020 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1022 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1023 &dsfield, &encap_limit))
1027 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1031 if (t->parms.erspan_ver == 1)
1032 erspan_build_header(skb, ntohl(t->parms.o_key),
1035 else if (t->parms.erspan_ver == 2)
1036 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1043 fl6.daddr = t->parms.raddr;
1046 /* Push GRE header. */
1047 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1048 : htons(ETH_P_ERSPAN2);
1049 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1051 /* TooBig packet may have updated dst->dev's mtu */
1052 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1053 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1055 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1058 /* XXX: send ICMP error even if DF is not set. */
1059 if (err == -EMSGSIZE) {
1060 if (skb->protocol == htons(ETH_P_IP))
1061 icmp_send(skb, ICMP_DEST_UNREACH,
1062 ICMP_FRAG_NEEDED, htonl(mtu));
1064 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1069 return NETDEV_TX_OK;
1072 stats = &t->dev->stats;
1074 stats->tx_dropped++;
1076 return NETDEV_TX_OK;
1079 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1081 struct net_device *dev = t->dev;
1082 struct __ip6_tnl_parm *p = &t->parms;
1083 struct flowi6 *fl6 = &t->fl.u.ip6;
1085 if (dev->type != ARPHRD_ETHER) {
1086 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1087 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1090 /* Set up flowi template */
1091 fl6->saddr = p->laddr;
1092 fl6->daddr = p->raddr;
1093 fl6->flowi6_oif = p->link;
1095 fl6->flowi6_proto = IPPROTO_GRE;
1096 fl6->fl6_gre_key = t->parms.o_key;
1098 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1099 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1100 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1101 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1103 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1104 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1106 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1107 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1108 dev->flags |= IFF_POINTOPOINT;
1110 dev->flags &= ~IFF_POINTOPOINT;
1113 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1116 const struct __ip6_tnl_parm *p = &t->parms;
1117 struct net_device *dev = t->dev;
1119 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1120 int strict = (ipv6_addr_type(&p->raddr) &
1121 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1123 struct rt6_info *rt = rt6_lookup(t->net,
1124 &p->raddr, &p->laddr,
1125 p->link, NULL, strict);
1131 unsigned short dst_len = rt->dst.dev->hard_header_len +
1134 if (t->dev->header_ops)
1135 dev->hard_header_len = dst_len;
1137 dev->needed_headroom = dst_len;
1140 dev->mtu = rt->dst.dev->mtu - t_hlen;
1141 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1143 if (dev->type == ARPHRD_ETHER)
1144 dev->mtu -= ETH_HLEN;
1146 if (dev->mtu < IPV6_MIN_MTU)
1147 dev->mtu = IPV6_MIN_MTU;
1154 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1158 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1159 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1161 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1163 if (tunnel->dev->header_ops)
1164 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1166 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1171 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1173 ip6gre_tnl_link_config_common(t);
1174 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1177 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1178 const struct __ip6_tnl_parm *p)
1180 t->parms.laddr = p->laddr;
1181 t->parms.raddr = p->raddr;
1182 t->parms.flags = p->flags;
1183 t->parms.hop_limit = p->hop_limit;
1184 t->parms.encap_limit = p->encap_limit;
1185 t->parms.flowinfo = p->flowinfo;
1186 t->parms.link = p->link;
1187 t->parms.proto = p->proto;
1188 t->parms.i_key = p->i_key;
1189 t->parms.o_key = p->o_key;
1190 t->parms.i_flags = p->i_flags;
1191 t->parms.o_flags = p->o_flags;
1192 t->parms.fwmark = p->fwmark;
1193 t->parms.erspan_ver = p->erspan_ver;
1194 t->parms.index = p->index;
1195 t->parms.dir = p->dir;
1196 t->parms.hwid = p->hwid;
1197 dst_cache_reset(&t->dst_cache);
1200 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1203 ip6gre_tnl_copy_tnl_parm(t, p);
1204 ip6gre_tnl_link_config(t, set_mtu);
1208 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1209 const struct ip6_tnl_parm2 *u)
1211 p->laddr = u->laddr;
1212 p->raddr = u->raddr;
1213 p->flags = u->flags;
1214 p->hop_limit = u->hop_limit;
1215 p->encap_limit = u->encap_limit;
1216 p->flowinfo = u->flowinfo;
1218 p->i_key = u->i_key;
1219 p->o_key = u->o_key;
1220 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1221 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1222 memcpy(p->name, u->name, sizeof(u->name));
1225 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1226 const struct __ip6_tnl_parm *p)
1228 u->proto = IPPROTO_GRE;
1229 u->laddr = p->laddr;
1230 u->raddr = p->raddr;
1231 u->flags = p->flags;
1232 u->hop_limit = p->hop_limit;
1233 u->encap_limit = p->encap_limit;
1234 u->flowinfo = p->flowinfo;
1236 u->i_key = p->i_key;
1237 u->o_key = p->o_key;
1238 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1239 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1240 memcpy(u->name, p->name, sizeof(u->name));
1243 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1244 struct ifreq *ifr, int cmd)
1247 struct ip6_tnl_parm2 p;
1248 struct __ip6_tnl_parm p1;
1249 struct ip6_tnl *t = netdev_priv(dev);
1250 struct net *net = t->net;
1251 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1253 memset(&p1, 0, sizeof(p1));
1257 if (dev == ign->fb_tunnel_dev) {
1258 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1262 ip6gre_tnl_parm_from_user(&p1, &p);
1263 t = ip6gre_tunnel_locate(net, &p1, 0);
1265 t = netdev_priv(dev);
1267 memset(&p, 0, sizeof(p));
1268 ip6gre_tnl_parm_to_user(&p, &t->parms);
1269 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1276 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1280 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1284 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1287 if (!(p.i_flags&GRE_KEY))
1289 if (!(p.o_flags&GRE_KEY))
1292 ip6gre_tnl_parm_from_user(&p1, &p);
1293 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1295 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1297 if (t->dev != dev) {
1302 t = netdev_priv(dev);
1304 ip6gre_tunnel_unlink(ign, t);
1306 ip6gre_tnl_change(t, &p1, 1);
1307 ip6gre_tunnel_link(ign, t);
1308 netdev_state_change(dev);
1315 memset(&p, 0, sizeof(p));
1316 ip6gre_tnl_parm_to_user(&p, &t->parms);
1317 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1320 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1325 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1328 if (dev == ign->fb_tunnel_dev) {
1330 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1333 ip6gre_tnl_parm_from_user(&p1, &p);
1334 t = ip6gre_tunnel_locate(net, &p1, 0);
1338 if (t == netdev_priv(ign->fb_tunnel_dev))
1342 unregister_netdevice(dev);
1354 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1355 unsigned short type, const void *daddr,
1356 const void *saddr, unsigned int len)
1358 struct ip6_tnl *t = netdev_priv(dev);
1359 struct ipv6hdr *ipv6h;
1362 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1363 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1364 t->fl.u.ip6.flowlabel,
1365 true, &t->fl.u.ip6));
1366 ipv6h->hop_limit = t->parms.hop_limit;
1367 ipv6h->nexthdr = NEXTHDR_GRE;
1368 ipv6h->saddr = t->parms.laddr;
1369 ipv6h->daddr = t->parms.raddr;
1371 p = (__be16 *)(ipv6h + 1);
1372 p[0] = t->parms.o_flags;
1376 * Set the source hardware address.
1380 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1382 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1383 if (!ipv6_addr_any(&ipv6h->daddr))
1389 static const struct header_ops ip6gre_header_ops = {
1390 .create = ip6gre_header,
1393 static const struct net_device_ops ip6gre_netdev_ops = {
1394 .ndo_init = ip6gre_tunnel_init,
1395 .ndo_uninit = ip6gre_tunnel_uninit,
1396 .ndo_start_xmit = ip6gre_tunnel_xmit,
1397 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1398 .ndo_change_mtu = ip6_tnl_change_mtu,
1399 .ndo_get_stats64 = ip_tunnel_get_stats64,
1400 .ndo_get_iflink = ip6_tnl_get_iflink,
1403 static void ip6gre_dev_free(struct net_device *dev)
1405 struct ip6_tnl *t = netdev_priv(dev);
1407 gro_cells_destroy(&t->gro_cells);
1408 dst_cache_destroy(&t->dst_cache);
1409 free_percpu(dev->tstats);
1412 static void ip6gre_tunnel_setup(struct net_device *dev)
1414 dev->netdev_ops = &ip6gre_netdev_ops;
1415 dev->needs_free_netdev = true;
1416 dev->priv_destructor = ip6gre_dev_free;
1418 dev->type = ARPHRD_IP6GRE;
1420 dev->flags |= IFF_NOARP;
1421 dev->addr_len = sizeof(struct in6_addr);
1422 netif_keep_dst(dev);
1423 /* This perm addr will be used as interface identifier by IPv6 */
1424 dev->addr_assign_type = NET_ADDR_RANDOM;
1425 eth_random_addr(dev->perm_addr);
1428 #define GRE6_FEATURES (NETIF_F_SG | \
1429 NETIF_F_FRAGLIST | \
1433 static void ip6gre_tnl_init_features(struct net_device *dev)
1435 struct ip6_tnl *nt = netdev_priv(dev);
1437 dev->features |= GRE6_FEATURES;
1438 dev->hw_features |= GRE6_FEATURES;
1440 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1441 /* TCP offload with GRE SEQ is not supported, nor
1442 * can we support 2 levels of outer headers requiring
1445 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1446 nt->encap.type == TUNNEL_ENCAP_NONE) {
1447 dev->features |= NETIF_F_GSO_SOFTWARE;
1448 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1451 /* Can use a lockless transmit, unless we generate
1454 dev->features |= NETIF_F_LLTX;
1458 static int ip6gre_tunnel_init_common(struct net_device *dev)
1460 struct ip6_tnl *tunnel;
1464 tunnel = netdev_priv(dev);
1467 tunnel->net = dev_net(dev);
1468 strcpy(tunnel->parms.name, dev->name);
1470 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1474 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1476 goto cleanup_alloc_pcpu_stats;
1478 ret = gro_cells_init(&tunnel->gro_cells, dev);
1480 goto cleanup_dst_cache_init;
1482 t_hlen = ip6gre_calc_hlen(tunnel);
1483 dev->mtu = ETH_DATA_LEN - t_hlen;
1484 if (dev->type == ARPHRD_ETHER)
1485 dev->mtu -= ETH_HLEN;
1486 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1489 if (tunnel->parms.collect_md) {
1490 netif_keep_dst(dev);
1492 ip6gre_tnl_init_features(dev);
1497 cleanup_dst_cache_init:
1498 dst_cache_destroy(&tunnel->dst_cache);
1499 cleanup_alloc_pcpu_stats:
1500 free_percpu(dev->tstats);
1505 static int ip6gre_tunnel_init(struct net_device *dev)
1507 struct ip6_tnl *tunnel;
1510 ret = ip6gre_tunnel_init_common(dev);
1514 tunnel = netdev_priv(dev);
1516 if (tunnel->parms.collect_md)
1519 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1520 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1522 if (ipv6_addr_any(&tunnel->parms.raddr))
1523 dev->header_ops = &ip6gre_header_ops;
1528 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1530 struct ip6_tnl *tunnel = netdev_priv(dev);
1533 tunnel->net = dev_net(dev);
1534 strcpy(tunnel->parms.name, dev->name);
1536 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1539 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1541 .err_handler = ip6gre_err,
1542 .flags = INET6_PROTO_FINAL,
1545 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1547 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1548 struct net_device *dev, *aux;
1551 for_each_netdev_safe(net, dev, aux)
1552 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1553 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1554 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1555 unregister_netdevice_queue(dev, head);
1557 for (prio = 0; prio < 4; prio++) {
1559 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1562 t = rtnl_dereference(ign->tunnels[prio][h]);
1565 /* If dev is in the same netns, it has already
1566 * been added to the list by the previous loop.
1568 if (!net_eq(dev_net(t->dev), net))
1569 unregister_netdevice_queue(t->dev,
1571 t = rtnl_dereference(t->next);
1577 static int __net_init ip6gre_init_net(struct net *net)
1579 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1580 struct net_device *ndev;
1583 if (!net_has_fallback_tunnels(net))
1585 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1586 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1591 ign->fb_tunnel_dev = ndev;
1592 dev_net_set(ign->fb_tunnel_dev, net);
1593 /* FB netdevice is special: we have one, and only one per netns.
1594 * Allowing to move it to another netns is clearly unsafe.
1596 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1599 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1600 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1602 err = register_netdev(ign->fb_tunnel_dev);
1606 rcu_assign_pointer(ign->tunnels_wc[0],
1607 netdev_priv(ign->fb_tunnel_dev));
1616 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1622 list_for_each_entry(net, net_list, exit_list)
1623 ip6gre_destroy_tunnels(net, &list);
1624 unregister_netdevice_many(&list);
1628 static struct pernet_operations ip6gre_net_ops = {
1629 .init = ip6gre_init_net,
1630 .exit_batch = ip6gre_exit_batch_net,
1631 .id = &ip6gre_net_id,
1632 .size = sizeof(struct ip6gre_net),
1635 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1636 struct netlink_ext_ack *extack)
1644 if (data[IFLA_GRE_IFLAGS])
1645 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1646 if (data[IFLA_GRE_OFLAGS])
1647 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1648 if (flags & (GRE_VERSION|GRE_ROUTING))
1654 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1655 struct netlink_ext_ack *extack)
1657 struct in6_addr daddr;
1659 if (tb[IFLA_ADDRESS]) {
1660 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1662 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1663 return -EADDRNOTAVAIL;
1669 if (data[IFLA_GRE_REMOTE]) {
1670 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1671 if (ipv6_addr_any(&daddr))
1676 return ip6gre_tunnel_validate(tb, data, extack);
1679 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1680 struct netlink_ext_ack *extack)
1688 ret = ip6gre_tap_validate(tb, data, extack);
1692 /* ERSPAN should only have GRE sequence and key flag */
1693 if (data[IFLA_GRE_OFLAGS])
1694 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1695 if (data[IFLA_GRE_IFLAGS])
1696 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1697 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1698 flags != (GRE_SEQ | GRE_KEY))
1701 /* ERSPAN Session ID only has 10-bit. Since we reuse
1702 * 32-bit key field as ID, check it's range.
1704 if (data[IFLA_GRE_IKEY] &&
1705 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1708 if (data[IFLA_GRE_OKEY] &&
1709 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1712 if (data[IFLA_GRE_ERSPAN_VER]) {
1713 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1714 if (ver != 1 && ver != 2)
1719 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1720 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1722 if (index & ~INDEX_MASK)
1725 } else if (ver == 2) {
1726 if (data[IFLA_GRE_ERSPAN_DIR]) {
1727 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1729 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1733 if (data[IFLA_GRE_ERSPAN_HWID]) {
1734 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1736 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1744 static void ip6erspan_set_version(struct nlattr *data[],
1745 struct __ip6_tnl_parm *parms)
1750 parms->erspan_ver = 1;
1751 if (data[IFLA_GRE_ERSPAN_VER])
1752 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1754 if (parms->erspan_ver == 1) {
1755 if (data[IFLA_GRE_ERSPAN_INDEX])
1756 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1757 } else if (parms->erspan_ver == 2) {
1758 if (data[IFLA_GRE_ERSPAN_DIR])
1759 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1760 if (data[IFLA_GRE_ERSPAN_HWID])
1761 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1765 static void ip6gre_netlink_parms(struct nlattr *data[],
1766 struct __ip6_tnl_parm *parms)
1768 memset(parms, 0, sizeof(*parms));
1773 if (data[IFLA_GRE_LINK])
1774 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1776 if (data[IFLA_GRE_IFLAGS])
1777 parms->i_flags = gre_flags_to_tnl_flags(
1778 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1780 if (data[IFLA_GRE_OFLAGS])
1781 parms->o_flags = gre_flags_to_tnl_flags(
1782 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1784 if (data[IFLA_GRE_IKEY])
1785 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1787 if (data[IFLA_GRE_OKEY])
1788 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1790 if (data[IFLA_GRE_LOCAL])
1791 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1793 if (data[IFLA_GRE_REMOTE])
1794 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1796 if (data[IFLA_GRE_TTL])
1797 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1799 if (data[IFLA_GRE_ENCAP_LIMIT])
1800 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1802 if (data[IFLA_GRE_FLOWINFO])
1803 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1805 if (data[IFLA_GRE_FLAGS])
1806 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1808 if (data[IFLA_GRE_FWMARK])
1809 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1811 if (data[IFLA_GRE_COLLECT_METADATA])
1812 parms->collect_md = true;
1815 static int ip6gre_tap_init(struct net_device *dev)
1819 ret = ip6gre_tunnel_init_common(dev);
1823 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1828 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1829 .ndo_init = ip6gre_tap_init,
1830 .ndo_uninit = ip6gre_tunnel_uninit,
1831 .ndo_start_xmit = ip6gre_tunnel_xmit,
1832 .ndo_set_mac_address = eth_mac_addr,
1833 .ndo_validate_addr = eth_validate_addr,
1834 .ndo_change_mtu = ip6_tnl_change_mtu,
1835 .ndo_get_stats64 = ip_tunnel_get_stats64,
1836 .ndo_get_iflink = ip6_tnl_get_iflink,
1839 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1843 tunnel->tun_hlen = 8;
1844 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1845 erspan_hdr_len(tunnel->parms.erspan_ver);
1847 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1848 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1852 static int ip6erspan_tap_init(struct net_device *dev)
1854 struct ip6_tnl *tunnel;
1858 tunnel = netdev_priv(dev);
1861 tunnel->net = dev_net(dev);
1862 strcpy(tunnel->parms.name, dev->name);
1864 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1868 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1870 goto cleanup_alloc_pcpu_stats;
1872 ret = gro_cells_init(&tunnel->gro_cells, dev);
1874 goto cleanup_dst_cache_init;
1876 t_hlen = ip6erspan_calc_hlen(tunnel);
1877 dev->mtu = ETH_DATA_LEN - t_hlen;
1878 if (dev->type == ARPHRD_ETHER)
1879 dev->mtu -= ETH_HLEN;
1880 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1883 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1884 ip6erspan_tnl_link_config(tunnel, 1);
1889 cleanup_dst_cache_init:
1890 dst_cache_destroy(&tunnel->dst_cache);
1891 cleanup_alloc_pcpu_stats:
1892 free_percpu(dev->tstats);
1897 static const struct net_device_ops ip6erspan_netdev_ops = {
1898 .ndo_init = ip6erspan_tap_init,
1899 .ndo_uninit = ip6erspan_tunnel_uninit,
1900 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1901 .ndo_set_mac_address = eth_mac_addr,
1902 .ndo_validate_addr = eth_validate_addr,
1903 .ndo_change_mtu = ip6_tnl_change_mtu,
1904 .ndo_get_stats64 = ip_tunnel_get_stats64,
1905 .ndo_get_iflink = ip6_tnl_get_iflink,
1908 static void ip6gre_tap_setup(struct net_device *dev)
1914 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1915 dev->needs_free_netdev = true;
1916 dev->priv_destructor = ip6gre_dev_free;
1918 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1919 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1920 netif_keep_dst(dev);
1923 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1924 struct ip_tunnel_encap *ipencap)
1928 memset(ipencap, 0, sizeof(*ipencap));
1933 if (data[IFLA_GRE_ENCAP_TYPE]) {
1935 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1938 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1940 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1943 if (data[IFLA_GRE_ENCAP_SPORT]) {
1945 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1948 if (data[IFLA_GRE_ENCAP_DPORT]) {
1950 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1956 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1957 struct nlattr *tb[], struct nlattr *data[],
1958 struct netlink_ext_ack *extack)
1961 struct ip_tunnel_encap ipencap;
1964 nt = netdev_priv(dev);
1966 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1967 int err = ip6_tnl_encap_setup(nt, &ipencap);
1973 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1974 eth_hw_addr_random(dev);
1977 nt->net = dev_net(dev);
1979 err = register_netdevice(dev);
1984 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1990 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1991 struct nlattr *tb[], struct nlattr *data[],
1992 struct netlink_ext_ack *extack)
1994 struct ip6_tnl *nt = netdev_priv(dev);
1995 struct net *net = dev_net(dev);
1996 struct ip6gre_net *ign;
1999 ip6gre_netlink_parms(data, &nt->parms);
2000 ign = net_generic(net, ip6gre_net_id);
2002 if (nt->parms.collect_md) {
2003 if (rtnl_dereference(ign->collect_md_tun))
2006 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2010 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2012 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2013 ip6gre_tunnel_link_md(ign, nt);
2014 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2019 static struct ip6_tnl *
2020 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2021 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2022 struct netlink_ext_ack *extack)
2024 struct ip6_tnl *t, *nt = netdev_priv(dev);
2025 struct net *net = nt->net;
2026 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2027 struct ip_tunnel_encap ipencap;
2029 if (dev == ign->fb_tunnel_dev)
2030 return ERR_PTR(-EINVAL);
2032 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2033 int err = ip6_tnl_encap_setup(nt, &ipencap);
2036 return ERR_PTR(err);
2039 ip6gre_netlink_parms(data, p_p);
2041 t = ip6gre_tunnel_locate(net, p_p, 0);
2045 return ERR_PTR(-EEXIST);
2053 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2054 struct nlattr *data[],
2055 struct netlink_ext_ack *extack)
2057 struct ip6_tnl *t = netdev_priv(dev);
2058 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2059 struct __ip6_tnl_parm p;
2061 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2065 ip6gre_tunnel_unlink_md(ign, t);
2066 ip6gre_tunnel_unlink(ign, t);
2067 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2068 ip6gre_tunnel_link_md(ign, t);
2069 ip6gre_tunnel_link(ign, t);
2073 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2075 struct net *net = dev_net(dev);
2076 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2078 if (dev != ign->fb_tunnel_dev)
2079 unregister_netdevice_queue(dev, head);
2082 static size_t ip6gre_get_size(const struct net_device *dev)
2087 /* IFLA_GRE_IFLAGS */
2089 /* IFLA_GRE_OFLAGS */
2095 /* IFLA_GRE_LOCAL */
2096 nla_total_size(sizeof(struct in6_addr)) +
2097 /* IFLA_GRE_REMOTE */
2098 nla_total_size(sizeof(struct in6_addr)) +
2101 /* IFLA_GRE_ENCAP_LIMIT */
2103 /* IFLA_GRE_FLOWINFO */
2105 /* IFLA_GRE_FLAGS */
2107 /* IFLA_GRE_ENCAP_TYPE */
2109 /* IFLA_GRE_ENCAP_FLAGS */
2111 /* IFLA_GRE_ENCAP_SPORT */
2113 /* IFLA_GRE_ENCAP_DPORT */
2115 /* IFLA_GRE_COLLECT_METADATA */
2117 /* IFLA_GRE_FWMARK */
2119 /* IFLA_GRE_ERSPAN_INDEX */
2124 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2126 struct ip6_tnl *t = netdev_priv(dev);
2127 struct __ip6_tnl_parm *p = &t->parms;
2128 __be16 o_flags = p->o_flags;
2130 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2132 o_flags |= TUNNEL_KEY;
2134 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2135 goto nla_put_failure;
2137 if (p->erspan_ver == 1) {
2138 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2139 goto nla_put_failure;
2141 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2142 goto nla_put_failure;
2143 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2144 goto nla_put_failure;
2148 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2149 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2150 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2151 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2152 gre_tnl_flags_to_gre_flags(o_flags)) ||
2153 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2154 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2155 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2156 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2157 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2158 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2159 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2160 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2161 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2162 goto nla_put_failure;
2164 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2166 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2168 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2170 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2172 goto nla_put_failure;
2174 if (p->collect_md) {
2175 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2176 goto nla_put_failure;
2185 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2186 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2187 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2188 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2189 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2190 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2191 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2192 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2193 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2194 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2195 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2196 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2197 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2198 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2199 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2200 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2201 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2202 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2203 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2204 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2205 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2206 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2209 static void ip6erspan_tap_setup(struct net_device *dev)
2214 dev->netdev_ops = &ip6erspan_netdev_ops;
2215 dev->needs_free_netdev = true;
2216 dev->priv_destructor = ip6gre_dev_free;
2218 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2219 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2220 netif_keep_dst(dev);
2223 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2224 struct nlattr *tb[], struct nlattr *data[],
2225 struct netlink_ext_ack *extack)
2227 struct ip6_tnl *nt = netdev_priv(dev);
2228 struct net *net = dev_net(dev);
2229 struct ip6gre_net *ign;
2232 ip6gre_netlink_parms(data, &nt->parms);
2233 ip6erspan_set_version(data, &nt->parms);
2234 ign = net_generic(net, ip6gre_net_id);
2236 if (nt->parms.collect_md) {
2237 if (rtnl_dereference(ign->collect_md_tun_erspan))
2240 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2244 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2246 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2247 ip6erspan_tunnel_link_md(ign, nt);
2248 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2253 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2255 ip6gre_tnl_link_config_common(t);
2256 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2259 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2260 const struct __ip6_tnl_parm *p, int set_mtu)
2262 ip6gre_tnl_copy_tnl_parm(t, p);
2263 ip6erspan_tnl_link_config(t, set_mtu);
2267 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2268 struct nlattr *data[],
2269 struct netlink_ext_ack *extack)
2271 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2272 struct __ip6_tnl_parm p;
2275 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2279 ip6erspan_set_version(data, &p);
2280 ip6gre_tunnel_unlink_md(ign, t);
2281 ip6gre_tunnel_unlink(ign, t);
2282 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2283 ip6erspan_tunnel_link_md(ign, t);
2284 ip6gre_tunnel_link(ign, t);
2288 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2290 .maxtype = IFLA_GRE_MAX,
2291 .policy = ip6gre_policy,
2292 .priv_size = sizeof(struct ip6_tnl),
2293 .setup = ip6gre_tunnel_setup,
2294 .validate = ip6gre_tunnel_validate,
2295 .newlink = ip6gre_newlink,
2296 .changelink = ip6gre_changelink,
2297 .dellink = ip6gre_dellink,
2298 .get_size = ip6gre_get_size,
2299 .fill_info = ip6gre_fill_info,
2300 .get_link_net = ip6_tnl_get_link_net,
2303 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2304 .kind = "ip6gretap",
2305 .maxtype = IFLA_GRE_MAX,
2306 .policy = ip6gre_policy,
2307 .priv_size = sizeof(struct ip6_tnl),
2308 .setup = ip6gre_tap_setup,
2309 .validate = ip6gre_tap_validate,
2310 .newlink = ip6gre_newlink,
2311 .changelink = ip6gre_changelink,
2312 .get_size = ip6gre_get_size,
2313 .fill_info = ip6gre_fill_info,
2314 .get_link_net = ip6_tnl_get_link_net,
2317 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2318 .kind = "ip6erspan",
2319 .maxtype = IFLA_GRE_MAX,
2320 .policy = ip6gre_policy,
2321 .priv_size = sizeof(struct ip6_tnl),
2322 .setup = ip6erspan_tap_setup,
2323 .validate = ip6erspan_tap_validate,
2324 .newlink = ip6erspan_newlink,
2325 .changelink = ip6erspan_changelink,
2326 .get_size = ip6gre_get_size,
2327 .fill_info = ip6gre_fill_info,
2328 .get_link_net = ip6_tnl_get_link_net,
2332 * And now the modules code and kernel interface.
2335 static int __init ip6gre_init(void)
2339 pr_info("GRE over IPv6 tunneling driver\n");
2341 err = register_pernet_device(&ip6gre_net_ops);
2345 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2347 pr_info("%s: can't add protocol\n", __func__);
2348 goto add_proto_failed;
2351 err = rtnl_link_register(&ip6gre_link_ops);
2353 goto rtnl_link_failed;
2355 err = rtnl_link_register(&ip6gre_tap_ops);
2357 goto tap_ops_failed;
2359 err = rtnl_link_register(&ip6erspan_tap_ops);
2361 goto erspan_link_failed;
2367 rtnl_link_unregister(&ip6gre_tap_ops);
2369 rtnl_link_unregister(&ip6gre_link_ops);
2371 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2373 unregister_pernet_device(&ip6gre_net_ops);
2377 static void __exit ip6gre_fini(void)
2379 rtnl_link_unregister(&ip6gre_tap_ops);
2380 rtnl_link_unregister(&ip6gre_link_ops);
2381 rtnl_link_unregister(&ip6erspan_tap_ops);
2382 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2383 unregister_pernet_device(&ip6gre_net_ops);
2386 module_init(ip6gre_init);
2387 module_exit(ip6gre_fini);
2388 MODULE_LICENSE("GPL");
2389 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2390 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2391 MODULE_ALIAS_RTNL_LINK("ip6gre");
2392 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2393 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2394 MODULE_ALIAS_NETDEV("ip6gre0");