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 case ICMPV6_DEST_UNREACH:
443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
445 if (code != ICMPV6_PORT_UNREACH)
448 case ICMPV6_TIME_EXCEED:
449 if (code == ICMPV6_EXC_HOPLIMIT) {
450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
455 case ICMPV6_PARAMPROB: {
456 struct ipv6_tlv_tnl_enc_lim *tel;
460 if (code == ICMPV6_HDR_FIELD)
461 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
463 if (teli && teli == be32_to_cpu(info) - 2) {
464 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
465 if (tel->encap_limit == 0) {
466 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
470 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
475 case ICMPV6_PKT_TOOBIG:
476 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
479 ip6_redirect(skb, net, skb->dev->ifindex, 0,
480 sock_net_uid(net, NULL));
484 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
488 t->err_time = jiffies;
493 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
495 const struct ipv6hdr *ipv6h;
496 struct ip6_tnl *tunnel;
498 ipv6h = ipv6_hdr(skb);
499 tunnel = ip6gre_tunnel_lookup(skb->dev,
500 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
503 if (tunnel->parms.collect_md) {
504 struct metadata_dst *tun_dst;
509 tun_id = key32_to_tunnel_id(tpi->key);
511 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
513 return PACKET_REJECT;
515 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
517 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
523 return PACKET_REJECT;
526 static int ip6erspan_rcv(struct sk_buff *skb,
527 struct tnl_ptk_info *tpi,
530 struct erspan_base_hdr *ershdr;
531 const struct ipv6hdr *ipv6h;
532 struct erspan_md2 *md2;
533 struct ip6_tnl *tunnel;
536 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
537 return PACKET_REJECT;
539 ipv6h = ipv6_hdr(skb);
540 ershdr = (struct erspan_base_hdr *)skb->data;
543 tunnel = ip6gre_tunnel_lookup(skb->dev,
544 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
547 int len = erspan_hdr_len(ver);
549 if (unlikely(!pskb_may_pull(skb, len)))
550 return PACKET_REJECT;
552 if (__iptunnel_pull_header(skb, len,
555 return PACKET_REJECT;
557 if (tunnel->parms.collect_md) {
558 struct erspan_metadata *pkt_md, *md;
559 struct metadata_dst *tun_dst;
560 struct ip_tunnel_info *info;
565 tpi->flags |= TUNNEL_KEY;
567 tun_id = key32_to_tunnel_id(tpi->key);
569 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
572 return PACKET_REJECT;
574 /* skb can be uncloned in __iptunnel_pull_header, so
575 * old pkt_md is no longer valid and we need to reset
578 gh = skb_network_header(skb) +
579 skb_network_header_len(skb);
580 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
582 info = &tun_dst->u.tun_info;
583 md = ip_tunnel_info_opts(info);
586 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
588 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
589 info->options_len = sizeof(*md);
591 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
594 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
600 return PACKET_REJECT;
603 static int gre_rcv(struct sk_buff *skb)
605 struct tnl_ptk_info tpi;
606 bool csum_err = false;
609 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
613 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
616 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
617 tpi.proto == htons(ETH_P_ERSPAN2))) {
618 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
623 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
627 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
633 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
635 return iptunnel_handle_offloads(skb,
636 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
639 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
640 struct net_device *dev,
641 struct flowi6 *fl6, __u8 *dsfield,
644 const struct iphdr *iph = ip_hdr(skb);
645 struct ip6_tnl *t = netdev_priv(dev);
647 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
648 *encap_limit = t->parms.encap_limit;
650 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
652 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
653 *dsfield = ipv4_get_dsfield(iph);
655 *dsfield = ip6_tclass(t->parms.flowinfo);
657 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
658 fl6->flowi6_mark = skb->mark;
660 fl6->flowi6_mark = t->parms.fwmark;
662 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
665 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
666 struct net_device *dev,
667 struct flowi6 *fl6, __u8 *dsfield,
670 struct ipv6hdr *ipv6h;
671 struct ip6_tnl *t = netdev_priv(dev);
674 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
675 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
676 ipv6h = ipv6_hdr(skb);
679 struct ipv6_tlv_tnl_enc_lim *tel;
681 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
682 if (tel->encap_limit == 0) {
683 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
684 ICMPV6_HDR_FIELD, offset + 2);
687 *encap_limit = tel->encap_limit - 1;
688 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
689 *encap_limit = t->parms.encap_limit;
692 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
695 *dsfield = ipv6_get_dsfield(ipv6h);
697 *dsfield = ip6_tclass(t->parms.flowinfo);
699 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
700 fl6->flowlabel |= ip6_flowlabel(ipv6h);
702 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
703 fl6->flowi6_mark = skb->mark;
705 fl6->flowi6_mark = t->parms.fwmark;
707 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
712 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
714 struct ip_tunnel_info *tun_info;
716 tun_info = skb_tunnel_info(skb);
717 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
718 return ERR_PTR(-EINVAL);
723 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
724 struct net_device *dev, __u8 dsfield,
725 struct flowi6 *fl6, int encap_limit,
726 __u32 *pmtu, __be16 proto)
728 struct ip6_tnl *tunnel = netdev_priv(dev);
732 if (dev->type == ARPHRD_ETHER)
733 IPCB(skb)->flags = 0;
735 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
736 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
738 fl6->daddr = tunnel->parms.raddr;
740 /* Push GRE header. */
741 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
743 if (tunnel->parms.collect_md) {
744 struct ip_tunnel_info *tun_info;
745 const struct ip_tunnel_key *key;
748 tun_info = skb_tunnel_info_txcheck(skb);
749 if (IS_ERR(tun_info) ||
750 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
753 key = &tun_info->key;
754 memset(fl6, 0, sizeof(*fl6));
755 fl6->flowi6_proto = IPPROTO_GRE;
756 fl6->daddr = key->u.ipv6.dst;
757 fl6->flowlabel = key->label;
758 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
759 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
762 flags = key->tun_flags &
763 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
764 tun_hlen = gre_calc_hlen(flags);
766 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
769 gre_build_header(skb, tun_hlen,
771 tunnel_id_to_key32(tun_info->key.tun_id),
772 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
776 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
779 flags = tunnel->parms.o_flags;
781 gre_build_header(skb, tunnel->tun_hlen, flags,
782 protocol, tunnel->parms.o_key,
783 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
787 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
791 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
793 struct ip6_tnl *t = netdev_priv(dev);
794 int encap_limit = -1;
800 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
802 if (!t->parms.collect_md)
803 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
804 &dsfield, &encap_limit);
806 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
810 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
813 /* XXX: send ICMP error even if DF is not set. */
814 if (err == -EMSGSIZE)
815 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
823 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
825 struct ip6_tnl *t = netdev_priv(dev);
826 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
827 int encap_limit = -1;
833 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
836 if (!t->parms.collect_md &&
837 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
840 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
843 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
844 &mtu, skb->protocol);
846 if (err == -EMSGSIZE)
847 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
855 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
856 * @t: the outgoing tunnel device
857 * @hdr: IPv6 header from the incoming packet
860 * Avoid trivial tunneling loop by checking that tunnel exit-point
861 * doesn't match source of incoming packet.
868 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
869 const struct ipv6hdr *hdr)
871 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
874 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
876 struct ip6_tnl *t = netdev_priv(dev);
877 int encap_limit = -1;
882 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
883 encap_limit = t->parms.encap_limit;
885 if (!t->parms.collect_md)
886 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
888 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
892 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
897 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
898 struct net_device *dev)
900 struct ip6_tnl *t = netdev_priv(dev);
901 struct net_device_stats *stats = &t->dev->stats;
904 if (!pskb_inet_may_pull(skb))
907 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
910 switch (skb->protocol) {
911 case htons(ETH_P_IP):
912 ret = ip6gre_xmit_ipv4(skb, dev);
914 case htons(ETH_P_IPV6):
915 ret = ip6gre_xmit_ipv6(skb, dev);
918 ret = ip6gre_xmit_other(skb, dev);
928 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
935 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
936 struct net_device *dev)
938 struct ip_tunnel_info *tun_info = NULL;
939 struct ip6_tnl *t = netdev_priv(dev);
940 struct dst_entry *dst = skb_dst(skb);
941 struct net_device_stats *stats;
942 bool truncate = false;
943 int encap_limit = -1;
944 __u8 dsfield = false;
951 if (!pskb_inet_may_pull(skb))
954 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
957 if (gre_handle_offloads(skb, false))
960 if (skb->len > dev->mtu + dev->hard_header_len) {
961 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
966 nhoff = skb_network_offset(skb);
967 if (skb->protocol == htons(ETH_P_IP) &&
968 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
971 if (skb->protocol == htons(ETH_P_IPV6)) {
974 if (skb_transport_header_was_set(skb))
975 thoff = skb_transport_offset(skb);
977 thoff = nhoff + sizeof(struct ipv6hdr);
978 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
982 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
985 t->parms.o_flags &= ~TUNNEL_KEY;
986 IPCB(skb)->flags = 0;
988 /* For collect_md mode, derive fl6 from the tunnel key,
989 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
991 if (t->parms.collect_md) {
992 const struct ip_tunnel_key *key;
993 struct erspan_metadata *md;
996 tun_info = skb_tunnel_info_txcheck(skb);
997 if (IS_ERR(tun_info) ||
998 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1001 key = &tun_info->key;
1002 memset(&fl6, 0, sizeof(fl6));
1003 fl6.flowi6_proto = IPPROTO_GRE;
1004 fl6.daddr = key->u.ipv6.dst;
1005 fl6.flowlabel = key->label;
1006 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1007 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1010 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1012 if (tun_info->options_len < sizeof(*md))
1014 md = ip_tunnel_info_opts(tun_info);
1016 tun_id = tunnel_id_to_key32(key->tun_id);
1017 if (md->version == 1) {
1018 erspan_build_header(skb,
1020 ntohl(md->u.index), truncate,
1022 proto = htons(ETH_P_ERSPAN);
1023 } else if (md->version == 2) {
1024 erspan_build_header_v2(skb,
1027 get_hwid(&md->u.md2),
1029 proto = htons(ETH_P_ERSPAN2);
1034 switch (skb->protocol) {
1035 case htons(ETH_P_IP):
1036 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1037 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1038 &dsfield, &encap_limit);
1040 case htons(ETH_P_IPV6):
1041 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1043 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1044 &dsfield, &encap_limit))
1048 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1052 if (t->parms.erspan_ver == 1) {
1053 erspan_build_header(skb, ntohl(t->parms.o_key),
1056 proto = htons(ETH_P_ERSPAN);
1057 } else if (t->parms.erspan_ver == 2) {
1058 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1062 proto = htons(ETH_P_ERSPAN2);
1067 fl6.daddr = t->parms.raddr;
1070 /* Push GRE header. */
1071 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1073 /* TooBig packet may have updated dst->dev's mtu */
1074 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1075 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1077 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1080 /* XXX: send ICMP error even if DF is not set. */
1081 if (err == -EMSGSIZE) {
1082 if (skb->protocol == htons(ETH_P_IP))
1083 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1084 ICMP_FRAG_NEEDED, htonl(mtu));
1086 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1091 return NETDEV_TX_OK;
1094 stats = &t->dev->stats;
1095 if (!IS_ERR(tun_info))
1097 stats->tx_dropped++;
1099 return NETDEV_TX_OK;
1102 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1104 struct net_device *dev = t->dev;
1105 struct __ip6_tnl_parm *p = &t->parms;
1106 struct flowi6 *fl6 = &t->fl.u.ip6;
1108 if (dev->type != ARPHRD_ETHER) {
1109 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1110 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1113 /* Set up flowi template */
1114 fl6->saddr = p->laddr;
1115 fl6->daddr = p->raddr;
1116 fl6->flowi6_oif = p->link;
1118 fl6->flowi6_proto = IPPROTO_GRE;
1119 fl6->fl6_gre_key = t->parms.o_key;
1121 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1122 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1123 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1124 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1126 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1127 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1129 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1130 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1131 dev->flags |= IFF_POINTOPOINT;
1133 dev->flags &= ~IFF_POINTOPOINT;
1136 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1139 const struct __ip6_tnl_parm *p = &t->parms;
1140 struct net_device *dev = t->dev;
1142 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1143 int strict = (ipv6_addr_type(&p->raddr) &
1144 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1146 struct rt6_info *rt = rt6_lookup(t->net,
1147 &p->raddr, &p->laddr,
1148 p->link, NULL, strict);
1154 unsigned short dst_len = rt->dst.dev->hard_header_len +
1157 if (t->dev->header_ops)
1158 dev->hard_header_len = dst_len;
1160 dev->needed_headroom = dst_len;
1163 int mtu = rt->dst.dev->mtu - t_hlen;
1165 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1167 if (dev->type == ARPHRD_ETHER)
1170 if (mtu < IPV6_MIN_MTU)
1172 WRITE_ONCE(dev->mtu, mtu);
1179 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1183 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1184 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1186 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1188 if (tunnel->dev->header_ops)
1189 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1191 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1196 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1198 ip6gre_tnl_link_config_common(t);
1199 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1202 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1203 const struct __ip6_tnl_parm *p)
1205 t->parms.laddr = p->laddr;
1206 t->parms.raddr = p->raddr;
1207 t->parms.flags = p->flags;
1208 t->parms.hop_limit = p->hop_limit;
1209 t->parms.encap_limit = p->encap_limit;
1210 t->parms.flowinfo = p->flowinfo;
1211 t->parms.link = p->link;
1212 t->parms.proto = p->proto;
1213 t->parms.i_key = p->i_key;
1214 t->parms.o_key = p->o_key;
1215 t->parms.i_flags = p->i_flags;
1216 t->parms.o_flags = p->o_flags;
1217 t->parms.fwmark = p->fwmark;
1218 t->parms.erspan_ver = p->erspan_ver;
1219 t->parms.index = p->index;
1220 t->parms.dir = p->dir;
1221 t->parms.hwid = p->hwid;
1222 dst_cache_reset(&t->dst_cache);
1225 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1228 ip6gre_tnl_copy_tnl_parm(t, p);
1229 ip6gre_tnl_link_config(t, set_mtu);
1233 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1234 const struct ip6_tnl_parm2 *u)
1236 p->laddr = u->laddr;
1237 p->raddr = u->raddr;
1238 p->flags = u->flags;
1239 p->hop_limit = u->hop_limit;
1240 p->encap_limit = u->encap_limit;
1241 p->flowinfo = u->flowinfo;
1243 p->i_key = u->i_key;
1244 p->o_key = u->o_key;
1245 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1246 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1247 memcpy(p->name, u->name, sizeof(u->name));
1250 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1251 const struct __ip6_tnl_parm *p)
1253 u->proto = IPPROTO_GRE;
1254 u->laddr = p->laddr;
1255 u->raddr = p->raddr;
1256 u->flags = p->flags;
1257 u->hop_limit = p->hop_limit;
1258 u->encap_limit = p->encap_limit;
1259 u->flowinfo = p->flowinfo;
1261 u->i_key = p->i_key;
1262 u->o_key = p->o_key;
1263 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1264 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1265 memcpy(u->name, p->name, sizeof(u->name));
1268 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1269 struct ifreq *ifr, int cmd)
1272 struct ip6_tnl_parm2 p;
1273 struct __ip6_tnl_parm p1;
1274 struct ip6_tnl *t = netdev_priv(dev);
1275 struct net *net = t->net;
1276 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1278 memset(&p1, 0, sizeof(p1));
1282 if (dev == ign->fb_tunnel_dev) {
1283 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1287 ip6gre_tnl_parm_from_user(&p1, &p);
1288 t = ip6gre_tunnel_locate(net, &p1, 0);
1290 t = netdev_priv(dev);
1292 memset(&p, 0, sizeof(p));
1293 ip6gre_tnl_parm_to_user(&p, &t->parms);
1294 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1301 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1305 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1309 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1312 if (!(p.i_flags&GRE_KEY))
1314 if (!(p.o_flags&GRE_KEY))
1317 ip6gre_tnl_parm_from_user(&p1, &p);
1318 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1320 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1322 if (t->dev != dev) {
1327 t = netdev_priv(dev);
1329 ip6gre_tunnel_unlink(ign, t);
1331 ip6gre_tnl_change(t, &p1, 1);
1332 ip6gre_tunnel_link(ign, t);
1333 netdev_state_change(dev);
1340 memset(&p, 0, sizeof(p));
1341 ip6gre_tnl_parm_to_user(&p, &t->parms);
1342 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1345 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1350 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1353 if (dev == ign->fb_tunnel_dev) {
1355 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1358 ip6gre_tnl_parm_from_user(&p1, &p);
1359 t = ip6gre_tunnel_locate(net, &p1, 0);
1363 if (t == netdev_priv(ign->fb_tunnel_dev))
1367 unregister_netdevice(dev);
1379 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1380 unsigned short type, const void *daddr,
1381 const void *saddr, unsigned int len)
1383 struct ip6_tnl *t = netdev_priv(dev);
1384 struct ipv6hdr *ipv6h;
1387 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1388 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1389 t->fl.u.ip6.flowlabel,
1390 true, &t->fl.u.ip6));
1391 ipv6h->hop_limit = t->parms.hop_limit;
1392 ipv6h->nexthdr = NEXTHDR_GRE;
1393 ipv6h->saddr = t->parms.laddr;
1394 ipv6h->daddr = t->parms.raddr;
1396 p = (__be16 *)(ipv6h + 1);
1397 p[0] = t->parms.o_flags;
1401 * Set the source hardware address.
1405 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1407 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1408 if (!ipv6_addr_any(&ipv6h->daddr))
1414 static const struct header_ops ip6gre_header_ops = {
1415 .create = ip6gre_header,
1418 static const struct net_device_ops ip6gre_netdev_ops = {
1419 .ndo_init = ip6gre_tunnel_init,
1420 .ndo_uninit = ip6gre_tunnel_uninit,
1421 .ndo_start_xmit = ip6gre_tunnel_xmit,
1422 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1423 .ndo_change_mtu = ip6_tnl_change_mtu,
1424 .ndo_get_stats64 = ip_tunnel_get_stats64,
1425 .ndo_get_iflink = ip6_tnl_get_iflink,
1428 static void ip6gre_dev_free(struct net_device *dev)
1430 struct ip6_tnl *t = netdev_priv(dev);
1432 gro_cells_destroy(&t->gro_cells);
1433 dst_cache_destroy(&t->dst_cache);
1434 free_percpu(dev->tstats);
1437 static void ip6gre_tunnel_setup(struct net_device *dev)
1439 dev->netdev_ops = &ip6gre_netdev_ops;
1440 dev->needs_free_netdev = true;
1441 dev->priv_destructor = ip6gre_dev_free;
1443 dev->type = ARPHRD_IP6GRE;
1445 dev->flags |= IFF_NOARP;
1446 dev->addr_len = sizeof(struct in6_addr);
1447 netif_keep_dst(dev);
1448 /* This perm addr will be used as interface identifier by IPv6 */
1449 dev->addr_assign_type = NET_ADDR_RANDOM;
1450 eth_random_addr(dev->perm_addr);
1453 #define GRE6_FEATURES (NETIF_F_SG | \
1454 NETIF_F_FRAGLIST | \
1458 static void ip6gre_tnl_init_features(struct net_device *dev)
1460 struct ip6_tnl *nt = netdev_priv(dev);
1462 dev->features |= GRE6_FEATURES;
1463 dev->hw_features |= GRE6_FEATURES;
1465 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1466 /* TCP offload with GRE SEQ is not supported, nor
1467 * can we support 2 levels of outer headers requiring
1470 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1471 nt->encap.type == TUNNEL_ENCAP_NONE) {
1472 dev->features |= NETIF_F_GSO_SOFTWARE;
1473 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1476 /* Can use a lockless transmit, unless we generate
1479 dev->features |= NETIF_F_LLTX;
1483 static int ip6gre_tunnel_init_common(struct net_device *dev)
1485 struct ip6_tnl *tunnel;
1489 tunnel = netdev_priv(dev);
1492 tunnel->net = dev_net(dev);
1493 strcpy(tunnel->parms.name, dev->name);
1495 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1499 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1501 goto cleanup_alloc_pcpu_stats;
1503 ret = gro_cells_init(&tunnel->gro_cells, dev);
1505 goto cleanup_dst_cache_init;
1507 t_hlen = ip6gre_calc_hlen(tunnel);
1508 dev->mtu = ETH_DATA_LEN - t_hlen;
1509 if (dev->type == ARPHRD_ETHER)
1510 dev->mtu -= ETH_HLEN;
1511 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1514 if (tunnel->parms.collect_md) {
1515 netif_keep_dst(dev);
1517 ip6gre_tnl_init_features(dev);
1522 cleanup_dst_cache_init:
1523 dst_cache_destroy(&tunnel->dst_cache);
1524 cleanup_alloc_pcpu_stats:
1525 free_percpu(dev->tstats);
1530 static int ip6gre_tunnel_init(struct net_device *dev)
1532 struct ip6_tnl *tunnel;
1535 ret = ip6gre_tunnel_init_common(dev);
1539 tunnel = netdev_priv(dev);
1541 if (tunnel->parms.collect_md)
1544 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1545 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1547 if (ipv6_addr_any(&tunnel->parms.raddr))
1548 dev->header_ops = &ip6gre_header_ops;
1553 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1555 struct ip6_tnl *tunnel = netdev_priv(dev);
1558 tunnel->net = dev_net(dev);
1559 strcpy(tunnel->parms.name, dev->name);
1561 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1564 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1566 .err_handler = ip6gre_err,
1567 .flags = INET6_PROTO_FINAL,
1570 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1572 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1573 struct net_device *dev, *aux;
1576 for_each_netdev_safe(net, dev, aux)
1577 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1578 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1579 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1580 unregister_netdevice_queue(dev, head);
1582 for (prio = 0; prio < 4; prio++) {
1584 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1587 t = rtnl_dereference(ign->tunnels[prio][h]);
1590 /* If dev is in the same netns, it has already
1591 * been added to the list by the previous loop.
1593 if (!net_eq(dev_net(t->dev), net))
1594 unregister_netdevice_queue(t->dev,
1596 t = rtnl_dereference(t->next);
1602 static int __net_init ip6gre_init_net(struct net *net)
1604 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1605 struct net_device *ndev;
1608 if (!net_has_fallback_tunnels(net))
1610 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1611 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1616 ign->fb_tunnel_dev = ndev;
1617 dev_net_set(ign->fb_tunnel_dev, net);
1618 /* FB netdevice is special: we have one, and only one per netns.
1619 * Allowing to move it to another netns is clearly unsafe.
1621 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1624 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1625 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1627 err = register_netdev(ign->fb_tunnel_dev);
1631 rcu_assign_pointer(ign->tunnels_wc[0],
1632 netdev_priv(ign->fb_tunnel_dev));
1641 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1647 list_for_each_entry(net, net_list, exit_list)
1648 ip6gre_destroy_tunnels(net, &list);
1649 unregister_netdevice_many(&list);
1653 static struct pernet_operations ip6gre_net_ops = {
1654 .init = ip6gre_init_net,
1655 .exit_batch = ip6gre_exit_batch_net,
1656 .id = &ip6gre_net_id,
1657 .size = sizeof(struct ip6gre_net),
1660 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1661 struct netlink_ext_ack *extack)
1669 if (data[IFLA_GRE_IFLAGS])
1670 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1671 if (data[IFLA_GRE_OFLAGS])
1672 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1673 if (flags & (GRE_VERSION|GRE_ROUTING))
1679 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1680 struct netlink_ext_ack *extack)
1682 struct in6_addr daddr;
1684 if (tb[IFLA_ADDRESS]) {
1685 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1687 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1688 return -EADDRNOTAVAIL;
1694 if (data[IFLA_GRE_REMOTE]) {
1695 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1696 if (ipv6_addr_any(&daddr))
1701 return ip6gre_tunnel_validate(tb, data, extack);
1704 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1705 struct netlink_ext_ack *extack)
1713 ret = ip6gre_tap_validate(tb, data, extack);
1717 /* ERSPAN should only have GRE sequence and key flag */
1718 if (data[IFLA_GRE_OFLAGS])
1719 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1720 if (data[IFLA_GRE_IFLAGS])
1721 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1722 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1723 flags != (GRE_SEQ | GRE_KEY))
1726 /* ERSPAN Session ID only has 10-bit. Since we reuse
1727 * 32-bit key field as ID, check it's range.
1729 if (data[IFLA_GRE_IKEY] &&
1730 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1733 if (data[IFLA_GRE_OKEY] &&
1734 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1737 if (data[IFLA_GRE_ERSPAN_VER]) {
1738 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1739 if (ver != 1 && ver != 2)
1744 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1745 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1747 if (index & ~INDEX_MASK)
1750 } else if (ver == 2) {
1751 if (data[IFLA_GRE_ERSPAN_DIR]) {
1752 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1754 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1758 if (data[IFLA_GRE_ERSPAN_HWID]) {
1759 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1761 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1769 static void ip6erspan_set_version(struct nlattr *data[],
1770 struct __ip6_tnl_parm *parms)
1775 parms->erspan_ver = 1;
1776 if (data[IFLA_GRE_ERSPAN_VER])
1777 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1779 if (parms->erspan_ver == 1) {
1780 if (data[IFLA_GRE_ERSPAN_INDEX])
1781 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1782 } else if (parms->erspan_ver == 2) {
1783 if (data[IFLA_GRE_ERSPAN_DIR])
1784 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1785 if (data[IFLA_GRE_ERSPAN_HWID])
1786 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1790 static void ip6gre_netlink_parms(struct nlattr *data[],
1791 struct __ip6_tnl_parm *parms)
1793 memset(parms, 0, sizeof(*parms));
1798 if (data[IFLA_GRE_LINK])
1799 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1801 if (data[IFLA_GRE_IFLAGS])
1802 parms->i_flags = gre_flags_to_tnl_flags(
1803 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1805 if (data[IFLA_GRE_OFLAGS])
1806 parms->o_flags = gre_flags_to_tnl_flags(
1807 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1809 if (data[IFLA_GRE_IKEY])
1810 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1812 if (data[IFLA_GRE_OKEY])
1813 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1815 if (data[IFLA_GRE_LOCAL])
1816 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1818 if (data[IFLA_GRE_REMOTE])
1819 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1821 if (data[IFLA_GRE_TTL])
1822 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1824 if (data[IFLA_GRE_ENCAP_LIMIT])
1825 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1827 if (data[IFLA_GRE_FLOWINFO])
1828 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1830 if (data[IFLA_GRE_FLAGS])
1831 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1833 if (data[IFLA_GRE_FWMARK])
1834 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1836 if (data[IFLA_GRE_COLLECT_METADATA])
1837 parms->collect_md = true;
1840 static int ip6gre_tap_init(struct net_device *dev)
1844 ret = ip6gre_tunnel_init_common(dev);
1848 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1853 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1854 .ndo_init = ip6gre_tap_init,
1855 .ndo_uninit = ip6gre_tunnel_uninit,
1856 .ndo_start_xmit = ip6gre_tunnel_xmit,
1857 .ndo_set_mac_address = eth_mac_addr,
1858 .ndo_validate_addr = eth_validate_addr,
1859 .ndo_change_mtu = ip6_tnl_change_mtu,
1860 .ndo_get_stats64 = ip_tunnel_get_stats64,
1861 .ndo_get_iflink = ip6_tnl_get_iflink,
1864 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1868 tunnel->tun_hlen = 8;
1869 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1870 erspan_hdr_len(tunnel->parms.erspan_ver);
1872 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1873 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1877 static int ip6erspan_tap_init(struct net_device *dev)
1879 struct ip6_tnl *tunnel;
1883 tunnel = netdev_priv(dev);
1886 tunnel->net = dev_net(dev);
1887 strcpy(tunnel->parms.name, dev->name);
1889 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1893 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1895 goto cleanup_alloc_pcpu_stats;
1897 ret = gro_cells_init(&tunnel->gro_cells, dev);
1899 goto cleanup_dst_cache_init;
1901 t_hlen = ip6erspan_calc_hlen(tunnel);
1902 dev->mtu = ETH_DATA_LEN - t_hlen;
1903 if (dev->type == ARPHRD_ETHER)
1904 dev->mtu -= ETH_HLEN;
1905 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1908 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1909 ip6erspan_tnl_link_config(tunnel, 1);
1914 cleanup_dst_cache_init:
1915 dst_cache_destroy(&tunnel->dst_cache);
1916 cleanup_alloc_pcpu_stats:
1917 free_percpu(dev->tstats);
1922 static const struct net_device_ops ip6erspan_netdev_ops = {
1923 .ndo_init = ip6erspan_tap_init,
1924 .ndo_uninit = ip6erspan_tunnel_uninit,
1925 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1926 .ndo_set_mac_address = eth_mac_addr,
1927 .ndo_validate_addr = eth_validate_addr,
1928 .ndo_change_mtu = ip6_tnl_change_mtu,
1929 .ndo_get_stats64 = ip_tunnel_get_stats64,
1930 .ndo_get_iflink = ip6_tnl_get_iflink,
1933 static void ip6gre_tap_setup(struct net_device *dev)
1939 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1940 dev->needs_free_netdev = true;
1941 dev->priv_destructor = ip6gre_dev_free;
1943 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1944 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1945 netif_keep_dst(dev);
1948 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1949 struct ip_tunnel_encap *ipencap)
1953 memset(ipencap, 0, sizeof(*ipencap));
1958 if (data[IFLA_GRE_ENCAP_TYPE]) {
1960 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1963 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1965 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1968 if (data[IFLA_GRE_ENCAP_SPORT]) {
1970 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1973 if (data[IFLA_GRE_ENCAP_DPORT]) {
1975 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1981 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1982 struct nlattr *tb[], struct nlattr *data[],
1983 struct netlink_ext_ack *extack)
1986 struct ip_tunnel_encap ipencap;
1989 nt = netdev_priv(dev);
1991 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1992 int err = ip6_tnl_encap_setup(nt, &ipencap);
1998 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1999 eth_hw_addr_random(dev);
2002 nt->net = dev_net(dev);
2004 err = register_netdevice(dev);
2009 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2015 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2016 struct nlattr *tb[], struct nlattr *data[],
2017 struct netlink_ext_ack *extack)
2019 struct ip6_tnl *nt = netdev_priv(dev);
2020 struct net *net = dev_net(dev);
2021 struct ip6gre_net *ign;
2024 ip6gre_netlink_parms(data, &nt->parms);
2025 ign = net_generic(net, ip6gre_net_id);
2027 if (nt->parms.collect_md) {
2028 if (rtnl_dereference(ign->collect_md_tun))
2031 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2035 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2037 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2038 ip6gre_tunnel_link_md(ign, nt);
2039 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2044 static struct ip6_tnl *
2045 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2046 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2047 struct netlink_ext_ack *extack)
2049 struct ip6_tnl *t, *nt = netdev_priv(dev);
2050 struct net *net = nt->net;
2051 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2052 struct ip_tunnel_encap ipencap;
2054 if (dev == ign->fb_tunnel_dev)
2055 return ERR_PTR(-EINVAL);
2057 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2058 int err = ip6_tnl_encap_setup(nt, &ipencap);
2061 return ERR_PTR(err);
2064 ip6gre_netlink_parms(data, p_p);
2066 t = ip6gre_tunnel_locate(net, p_p, 0);
2070 return ERR_PTR(-EEXIST);
2078 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2079 struct nlattr *data[],
2080 struct netlink_ext_ack *extack)
2082 struct ip6_tnl *t = netdev_priv(dev);
2083 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2084 struct __ip6_tnl_parm p;
2086 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2090 ip6gre_tunnel_unlink_md(ign, t);
2091 ip6gre_tunnel_unlink(ign, t);
2092 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2093 ip6gre_tunnel_link_md(ign, t);
2094 ip6gre_tunnel_link(ign, t);
2098 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2100 struct net *net = dev_net(dev);
2101 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2103 if (dev != ign->fb_tunnel_dev)
2104 unregister_netdevice_queue(dev, head);
2107 static size_t ip6gre_get_size(const struct net_device *dev)
2112 /* IFLA_GRE_IFLAGS */
2114 /* IFLA_GRE_OFLAGS */
2120 /* IFLA_GRE_LOCAL */
2121 nla_total_size(sizeof(struct in6_addr)) +
2122 /* IFLA_GRE_REMOTE */
2123 nla_total_size(sizeof(struct in6_addr)) +
2126 /* IFLA_GRE_ENCAP_LIMIT */
2128 /* IFLA_GRE_FLOWINFO */
2130 /* IFLA_GRE_FLAGS */
2132 /* IFLA_GRE_ENCAP_TYPE */
2134 /* IFLA_GRE_ENCAP_FLAGS */
2136 /* IFLA_GRE_ENCAP_SPORT */
2138 /* IFLA_GRE_ENCAP_DPORT */
2140 /* IFLA_GRE_COLLECT_METADATA */
2142 /* IFLA_GRE_FWMARK */
2144 /* IFLA_GRE_ERSPAN_INDEX */
2149 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2151 struct ip6_tnl *t = netdev_priv(dev);
2152 struct __ip6_tnl_parm *p = &t->parms;
2153 __be16 o_flags = p->o_flags;
2155 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2157 o_flags |= TUNNEL_KEY;
2159 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2160 goto nla_put_failure;
2162 if (p->erspan_ver == 1) {
2163 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2164 goto nla_put_failure;
2166 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2167 goto nla_put_failure;
2168 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2169 goto nla_put_failure;
2173 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2174 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2175 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2176 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2177 gre_tnl_flags_to_gre_flags(o_flags)) ||
2178 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2179 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2180 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2181 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2182 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2183 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2184 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2185 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2186 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2187 goto nla_put_failure;
2189 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2191 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2193 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2195 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2197 goto nla_put_failure;
2199 if (p->collect_md) {
2200 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2201 goto nla_put_failure;
2210 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2211 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2212 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2213 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2214 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2215 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2216 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2217 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2218 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2219 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2220 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2221 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2222 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2223 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2224 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2225 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2226 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2227 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2228 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2229 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2230 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2231 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2234 static void ip6erspan_tap_setup(struct net_device *dev)
2239 dev->netdev_ops = &ip6erspan_netdev_ops;
2240 dev->needs_free_netdev = true;
2241 dev->priv_destructor = ip6gre_dev_free;
2243 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2244 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2245 netif_keep_dst(dev);
2248 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2249 struct nlattr *tb[], struct nlattr *data[],
2250 struct netlink_ext_ack *extack)
2252 struct ip6_tnl *nt = netdev_priv(dev);
2253 struct net *net = dev_net(dev);
2254 struct ip6gre_net *ign;
2257 ip6gre_netlink_parms(data, &nt->parms);
2258 ip6erspan_set_version(data, &nt->parms);
2259 ign = net_generic(net, ip6gre_net_id);
2261 if (nt->parms.collect_md) {
2262 if (rtnl_dereference(ign->collect_md_tun_erspan))
2265 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2269 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2271 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2272 ip6erspan_tunnel_link_md(ign, nt);
2273 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2278 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2280 ip6gre_tnl_link_config_common(t);
2281 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2284 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2285 const struct __ip6_tnl_parm *p, int set_mtu)
2287 ip6gre_tnl_copy_tnl_parm(t, p);
2288 ip6erspan_tnl_link_config(t, set_mtu);
2292 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2293 struct nlattr *data[],
2294 struct netlink_ext_ack *extack)
2296 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2297 struct __ip6_tnl_parm p;
2300 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2304 ip6erspan_set_version(data, &p);
2305 ip6gre_tunnel_unlink_md(ign, t);
2306 ip6gre_tunnel_unlink(ign, t);
2307 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2308 ip6erspan_tunnel_link_md(ign, t);
2309 ip6gre_tunnel_link(ign, t);
2313 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2315 .maxtype = IFLA_GRE_MAX,
2316 .policy = ip6gre_policy,
2317 .priv_size = sizeof(struct ip6_tnl),
2318 .setup = ip6gre_tunnel_setup,
2319 .validate = ip6gre_tunnel_validate,
2320 .newlink = ip6gre_newlink,
2321 .changelink = ip6gre_changelink,
2322 .dellink = ip6gre_dellink,
2323 .get_size = ip6gre_get_size,
2324 .fill_info = ip6gre_fill_info,
2325 .get_link_net = ip6_tnl_get_link_net,
2328 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2329 .kind = "ip6gretap",
2330 .maxtype = IFLA_GRE_MAX,
2331 .policy = ip6gre_policy,
2332 .priv_size = sizeof(struct ip6_tnl),
2333 .setup = ip6gre_tap_setup,
2334 .validate = ip6gre_tap_validate,
2335 .newlink = ip6gre_newlink,
2336 .changelink = ip6gre_changelink,
2337 .get_size = ip6gre_get_size,
2338 .fill_info = ip6gre_fill_info,
2339 .get_link_net = ip6_tnl_get_link_net,
2342 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2343 .kind = "ip6erspan",
2344 .maxtype = IFLA_GRE_MAX,
2345 .policy = ip6gre_policy,
2346 .priv_size = sizeof(struct ip6_tnl),
2347 .setup = ip6erspan_tap_setup,
2348 .validate = ip6erspan_tap_validate,
2349 .newlink = ip6erspan_newlink,
2350 .changelink = ip6erspan_changelink,
2351 .get_size = ip6gre_get_size,
2352 .fill_info = ip6gre_fill_info,
2353 .get_link_net = ip6_tnl_get_link_net,
2357 * And now the modules code and kernel interface.
2360 static int __init ip6gre_init(void)
2364 pr_info("GRE over IPv6 tunneling driver\n");
2366 err = register_pernet_device(&ip6gre_net_ops);
2370 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2372 pr_info("%s: can't add protocol\n", __func__);
2373 goto add_proto_failed;
2376 err = rtnl_link_register(&ip6gre_link_ops);
2378 goto rtnl_link_failed;
2380 err = rtnl_link_register(&ip6gre_tap_ops);
2382 goto tap_ops_failed;
2384 err = rtnl_link_register(&ip6erspan_tap_ops);
2386 goto erspan_link_failed;
2392 rtnl_link_unregister(&ip6gre_tap_ops);
2394 rtnl_link_unregister(&ip6gre_link_ops);
2396 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2398 unregister_pernet_device(&ip6gre_net_ops);
2402 static void __exit ip6gre_fini(void)
2404 rtnl_link_unregister(&ip6gre_tap_ops);
2405 rtnl_link_unregister(&ip6gre_link_ops);
2406 rtnl_link_unregister(&ip6erspan_tap_ops);
2407 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2408 unregister_pernet_device(&ip6gre_net_ops);
2411 module_init(ip6gre_init);
2412 module_exit(ip6gre_fini);
2413 MODULE_LICENSE("GPL");
2414 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2415 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2416 MODULE_ALIAS_RTNL_LINK("ip6gre");
2417 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2418 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2419 MODULE_ALIAS_NETDEV("ip6gre0");