1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * GRE over IPv6 protocol decoder.
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/in6.h>
24 #include <linux/inetdevice.h>
25 #include <linux/igmp.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/etherdevice.h>
28 #include <linux/if_ether.h>
29 #include <linux/hash.h>
30 #include <linux/if_tunnel.h>
31 #include <linux/ip6_tunnel.h>
35 #include <net/ip_tunnels.h>
37 #include <net/protocol.h>
38 #include <net/addrconf.h>
40 #include <net/checksum.h>
41 #include <net/dsfield.h>
42 #include <net/inet_ecn.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46 #include <net/rtnetlink.h>
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
51 #include <net/ip6_tunnel.h>
53 #include <net/erspan.h>
54 #include <net/dst_metadata.h>
57 static bool log_ecn_error = true;
58 module_param(log_ecn_error, bool, 0644);
59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
61 #define IP6_GRE_HASH_SIZE_SHIFT 5
62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
64 static unsigned int ip6gre_net_id __read_mostly;
66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
68 struct ip6_tnl __rcu *collect_md_tun;
69 struct ip6_tnl __rcu *collect_md_tun_erspan;
70 struct net_device *fb_tunnel_dev;
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82 /* Tunnel hash table */
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
101 static u32 HASH_ADDR(const struct in6_addr *addr)
103 u32 hash = ipv6_addr_hash(addr);
105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
108 #define tunnels_r_l tunnels[3]
109 #define tunnels_r tunnels[2]
110 #define tunnels_l tunnels[1]
111 #define tunnels_wc tunnels[0]
113 /* Given src, dst and key, find appropriate for input tunnel. */
115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
125 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
126 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130 struct net_device *ndev;
132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
144 if (t->parms.link != link)
146 if (t->dev->type != dev_type)
151 if (score < cand_score) {
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
168 if (t->parms.link != link)
170 if (t->dev->type != dev_type)
175 if (score < cand_score) {
181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
194 if (t->parms.link != link)
196 if (t->dev->type != dev_type)
201 if (score < cand_score) {
207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
217 if (t->parms.link != link)
219 if (t->dev->type != dev_type)
224 if (score < cand_score) {
233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
237 t = rcu_dereference(ign->collect_md_tun);
239 if (t && t->dev->flags & IFF_UP)
242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
257 if (!ipv6_addr_any(local))
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
261 h ^= HASH_ADDR(remote);
264 return &ign->tunnels[prio][h];
267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
295 return __ip6gre_bucket(ign, &t->parms);
298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
315 rcu_assign_pointer(*tp, t->next);
321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
363 strscpy(name, parms->name, IFNAMSIZ);
365 strcpy(name, "ip6gre%d");
367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
372 dev_net_set(dev, net);
374 nt = netdev_priv(dev);
376 dev->rtnl_link_ops = &ip6gre_link_ops;
379 nt->net = dev_net(dev);
381 if (register_netdevice(dev) < 0)
384 ip6gre_tnl_link_config(nt, 1);
385 ip6gre_tunnel_link(ign, nt);
393 static void ip6erspan_tunnel_uninit(struct net_device *dev)
395 struct ip6_tnl *t = netdev_priv(dev);
396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
398 ip6erspan_tunnel_unlink_md(ign, t);
399 ip6gre_tunnel_unlink(ign, t);
400 dst_cache_reset(&t->dst_cache);
401 netdev_put(dev, &t->dev_tracker);
404 static void ip6gre_tunnel_uninit(struct net_device *dev)
406 struct ip6_tnl *t = netdev_priv(dev);
407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
409 ip6gre_tunnel_unlink_md(ign, t);
410 ip6gre_tunnel_unlink(ign, t);
411 if (ign->fb_tunnel_dev == dev)
412 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
413 dst_cache_reset(&t->dst_cache);
414 netdev_put(dev, &t->dev_tracker);
418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
419 u8 type, u8 code, int offset, __be32 info)
421 struct net *net = dev_net(skb->dev);
422 const struct ipv6hdr *ipv6h;
423 struct tnl_ptk_info tpi;
426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
430 ipv6h = (const struct ipv6hdr *)skb->data;
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
437 case ICMPV6_DEST_UNREACH:
438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
440 if (code != ICMPV6_PORT_UNREACH)
443 case ICMPV6_TIME_EXCEED:
444 if (code == ICMPV6_EXC_HOPLIMIT) {
445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
450 case ICMPV6_PARAMPROB: {
451 struct ipv6_tlv_tnl_enc_lim *tel;
455 if (code == ICMPV6_HDR_FIELD)
456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
458 if (teli && teli == be32_to_cpu(info) - 2) {
459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
460 if (tel->encap_limit == 0) {
461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
470 case ICMPV6_PKT_TOOBIG:
471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
474 ip6_redirect(skb, net, skb->dev->ifindex, 0,
475 sock_net_uid(net, NULL));
479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
483 t->err_time = jiffies;
488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
490 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
493 ipv6h = ipv6_hdr(skb);
494 tunnel = ip6gre_tunnel_lookup(skb->dev,
495 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
498 if (tunnel->parms.collect_md) {
499 struct metadata_dst *tun_dst;
504 tun_id = key32_to_tunnel_id(tpi->key);
506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
508 return PACKET_REJECT;
510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
518 return PACKET_REJECT;
521 static int ip6erspan_rcv(struct sk_buff *skb,
522 struct tnl_ptk_info *tpi,
525 struct erspan_base_hdr *ershdr;
526 const struct ipv6hdr *ipv6h;
527 struct erspan_md2 *md2;
528 struct ip6_tnl *tunnel;
531 ipv6h = ipv6_hdr(skb);
532 ershdr = (struct erspan_base_hdr *)skb->data;
535 tunnel = ip6gre_tunnel_lookup(skb->dev,
536 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
539 int len = erspan_hdr_len(ver);
541 if (unlikely(!pskb_may_pull(skb, len)))
542 return PACKET_REJECT;
544 if (__iptunnel_pull_header(skb, len,
547 return PACKET_REJECT;
549 if (tunnel->parms.collect_md) {
550 struct erspan_metadata *pkt_md, *md;
551 struct metadata_dst *tun_dst;
552 struct ip_tunnel_info *info;
557 tpi->flags |= TUNNEL_KEY;
559 tun_id = key32_to_tunnel_id(tpi->key);
561 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
564 return PACKET_REJECT;
566 /* skb can be uncloned in __iptunnel_pull_header, so
567 * old pkt_md is no longer valid and we need to reset
570 gh = skb_network_header(skb) +
571 skb_network_header_len(skb);
572 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
574 info = &tun_dst->u.tun_info;
575 md = ip_tunnel_info_opts(info);
578 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
580 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
581 info->options_len = sizeof(*md);
583 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
586 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
592 return PACKET_REJECT;
595 static int gre_rcv(struct sk_buff *skb)
597 struct tnl_ptk_info tpi;
598 bool csum_err = false;
601 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
605 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
608 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
609 tpi.proto == htons(ETH_P_ERSPAN2))) {
610 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
615 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
619 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
625 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
627 return iptunnel_handle_offloads(skb,
628 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
631 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
632 struct net_device *dev,
633 struct flowi6 *fl6, __u8 *dsfield,
636 const struct iphdr *iph = ip_hdr(skb);
637 struct ip6_tnl *t = netdev_priv(dev);
639 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
640 *encap_limit = t->parms.encap_limit;
642 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
644 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
645 *dsfield = ipv4_get_dsfield(iph);
647 *dsfield = ip6_tclass(t->parms.flowinfo);
649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
650 fl6->flowi6_mark = skb->mark;
652 fl6->flowi6_mark = t->parms.fwmark;
654 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
657 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
658 struct net_device *dev,
659 struct flowi6 *fl6, __u8 *dsfield,
662 struct ipv6hdr *ipv6h;
663 struct ip6_tnl *t = netdev_priv(dev);
666 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
667 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
668 ipv6h = ipv6_hdr(skb);
671 struct ipv6_tlv_tnl_enc_lim *tel;
673 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
674 if (tel->encap_limit == 0) {
675 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
676 ICMPV6_HDR_FIELD, offset + 2);
679 *encap_limit = tel->encap_limit - 1;
680 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
681 *encap_limit = t->parms.encap_limit;
684 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
686 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
687 *dsfield = ipv6_get_dsfield(ipv6h);
689 *dsfield = ip6_tclass(t->parms.flowinfo);
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
692 fl6->flowlabel |= ip6_flowlabel(ipv6h);
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
695 fl6->flowi6_mark = skb->mark;
697 fl6->flowi6_mark = t->parms.fwmark;
699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
704 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
705 struct net_device *dev,
706 struct flowi6 *fl6, __u8 *dsfield,
709 struct ip6_tnl *t = netdev_priv(dev);
711 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
712 *encap_limit = t->parms.encap_limit;
714 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
716 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
719 *dsfield = ip6_tclass(t->parms.flowinfo);
721 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
722 fl6->flowi6_mark = skb->mark;
724 fl6->flowi6_mark = t->parms.fwmark;
726 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
731 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
733 struct ip_tunnel_info *tun_info;
735 tun_info = skb_tunnel_info(skb);
736 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
737 return ERR_PTR(-EINVAL);
742 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
743 struct net_device *dev, __u8 dsfield,
744 struct flowi6 *fl6, int encap_limit,
745 __u32 *pmtu, __be16 proto)
747 struct ip6_tnl *tunnel = netdev_priv(dev);
751 if (dev->type == ARPHRD_ETHER)
752 IPCB(skb)->flags = 0;
754 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
755 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
757 fl6->daddr = tunnel->parms.raddr;
759 /* Push GRE header. */
760 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
762 if (tunnel->parms.collect_md) {
763 struct ip_tunnel_info *tun_info;
764 const struct ip_tunnel_key *key;
767 tun_info = skb_tunnel_info_txcheck(skb);
768 if (IS_ERR(tun_info) ||
769 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
772 key = &tun_info->key;
773 memset(fl6, 0, sizeof(*fl6));
774 fl6->flowi6_proto = IPPROTO_GRE;
775 fl6->daddr = key->u.ipv6.dst;
776 fl6->flowlabel = key->label;
777 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
778 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
781 flags = key->tun_flags &
782 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
783 tun_hlen = gre_calc_hlen(flags);
785 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
788 gre_build_header(skb, tun_hlen,
790 tunnel_id_to_key32(tun_info->key.tun_id),
791 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
795 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
798 flags = tunnel->parms.o_flags;
800 gre_build_header(skb, tunnel->tun_hlen, flags,
801 protocol, tunnel->parms.o_key,
802 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
806 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
810 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
812 struct ip6_tnl *t = netdev_priv(dev);
813 int encap_limit = -1;
819 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
821 if (!t->parms.collect_md)
822 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
823 &dsfield, &encap_limit);
825 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
829 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
832 /* XXX: send ICMP error even if DF is not set. */
833 if (err == -EMSGSIZE)
834 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
842 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
844 struct ip6_tnl *t = netdev_priv(dev);
845 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
846 int encap_limit = -1;
852 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
855 if (!t->parms.collect_md &&
856 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
859 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
862 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
863 &mtu, skb->protocol);
865 if (err == -EMSGSIZE)
866 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
874 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
875 * @t: the outgoing tunnel device
876 * @hdr: IPv6 header from the incoming packet
879 * Avoid trivial tunneling loop by checking that tunnel exit-point
880 * doesn't match source of incoming packet.
887 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
888 const struct ipv6hdr *hdr)
890 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
893 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
895 struct ip6_tnl *t = netdev_priv(dev);
896 int encap_limit = -1;
902 if (!t->parms.collect_md &&
903 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
906 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
909 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
914 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
915 struct net_device *dev)
917 struct ip6_tnl *t = netdev_priv(dev);
918 struct net_device_stats *stats = &t->dev->stats;
919 __be16 payload_protocol;
922 if (!pskb_inet_may_pull(skb))
925 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
928 payload_protocol = skb_protocol(skb, true);
929 switch (payload_protocol) {
930 case htons(ETH_P_IP):
931 ret = ip6gre_xmit_ipv4(skb, dev);
933 case htons(ETH_P_IPV6):
934 ret = ip6gre_xmit_ipv6(skb, dev);
937 ret = ip6gre_xmit_other(skb, dev);
947 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
954 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
955 struct net_device *dev)
957 struct ip_tunnel_info *tun_info = NULL;
958 struct ip6_tnl *t = netdev_priv(dev);
959 struct dst_entry *dst = skb_dst(skb);
960 struct net_device_stats *stats;
961 bool truncate = false;
962 int encap_limit = -1;
963 __u8 dsfield = false;
970 if (!pskb_inet_may_pull(skb))
973 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
976 if (gre_handle_offloads(skb, false))
979 if (skb->len > dev->mtu + dev->hard_header_len) {
980 pskb_trim(skb, dev->mtu + dev->hard_header_len);
984 nhoff = skb_network_header(skb) - skb_mac_header(skb);
985 if (skb->protocol == htons(ETH_P_IP) &&
986 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
989 if (skb->protocol == htons(ETH_P_IPV6)) {
992 if (skb_transport_header_was_set(skb))
993 thoff = skb_transport_header(skb) - skb_mac_header(skb);
995 thoff = nhoff + sizeof(struct ipv6hdr);
996 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
1000 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
1003 t->parms.o_flags &= ~TUNNEL_KEY;
1004 IPCB(skb)->flags = 0;
1006 /* For collect_md mode, derive fl6 from the tunnel key,
1007 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1009 if (t->parms.collect_md) {
1010 const struct ip_tunnel_key *key;
1011 struct erspan_metadata *md;
1014 tun_info = skb_tunnel_info_txcheck(skb);
1015 if (IS_ERR(tun_info) ||
1016 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1019 key = &tun_info->key;
1020 memset(&fl6, 0, sizeof(fl6));
1021 fl6.flowi6_proto = IPPROTO_GRE;
1022 fl6.daddr = key->u.ipv6.dst;
1023 fl6.flowlabel = key->label;
1024 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1025 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1028 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1030 if (tun_info->options_len < sizeof(*md))
1032 md = ip_tunnel_info_opts(tun_info);
1034 tun_id = tunnel_id_to_key32(key->tun_id);
1035 if (md->version == 1) {
1036 erspan_build_header(skb,
1038 ntohl(md->u.index), truncate,
1040 } else if (md->version == 2) {
1041 erspan_build_header_v2(skb,
1044 get_hwid(&md->u.md2),
1050 switch (skb->protocol) {
1051 case htons(ETH_P_IP):
1052 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1053 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1054 &dsfield, &encap_limit);
1056 case htons(ETH_P_IPV6):
1057 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1059 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1060 &dsfield, &encap_limit))
1064 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1068 if (t->parms.erspan_ver == 1)
1069 erspan_build_header(skb, ntohl(t->parms.o_key),
1072 else if (t->parms.erspan_ver == 2)
1073 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1080 fl6.daddr = t->parms.raddr;
1083 /* Push GRE header. */
1084 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1085 : htons(ETH_P_ERSPAN2);
1086 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1088 /* TooBig packet may have updated dst->dev's mtu */
1089 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1090 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1092 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1095 /* XXX: send ICMP error even if DF is not set. */
1096 if (err == -EMSGSIZE) {
1097 if (skb->protocol == htons(ETH_P_IP))
1098 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1099 ICMP_FRAG_NEEDED, htonl(mtu));
1101 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1106 return NETDEV_TX_OK;
1109 stats = &t->dev->stats;
1110 if (!IS_ERR(tun_info))
1112 stats->tx_dropped++;
1114 return NETDEV_TX_OK;
1117 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1119 struct net_device *dev = t->dev;
1120 struct __ip6_tnl_parm *p = &t->parms;
1121 struct flowi6 *fl6 = &t->fl.u.ip6;
1123 if (dev->type != ARPHRD_ETHER) {
1124 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1125 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1128 /* Set up flowi template */
1129 fl6->saddr = p->laddr;
1130 fl6->daddr = p->raddr;
1131 fl6->flowi6_oif = p->link;
1133 fl6->flowi6_proto = IPPROTO_GRE;
1134 fl6->fl6_gre_key = t->parms.o_key;
1136 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1137 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1138 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1139 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1141 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1142 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1144 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1145 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1146 dev->flags |= IFF_POINTOPOINT;
1148 dev->flags &= ~IFF_POINTOPOINT;
1151 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1154 const struct __ip6_tnl_parm *p = &t->parms;
1155 struct net_device *dev = t->dev;
1157 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1158 int strict = (ipv6_addr_type(&p->raddr) &
1159 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1161 struct rt6_info *rt = rt6_lookup(t->net,
1162 &p->raddr, &p->laddr,
1163 p->link, NULL, strict);
1169 unsigned short dst_len = rt->dst.dev->hard_header_len +
1172 if (t->dev->header_ops)
1173 dev->hard_header_len = dst_len;
1175 dev->needed_headroom = dst_len;
1178 int mtu = rt->dst.dev->mtu - t_hlen;
1180 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1182 if (dev->type == ARPHRD_ETHER)
1185 if (mtu < IPV6_MIN_MTU)
1187 WRITE_ONCE(dev->mtu, mtu);
1194 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1198 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1199 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1201 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1203 if (tunnel->dev->header_ops)
1204 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1206 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1211 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1213 ip6gre_tnl_link_config_common(t);
1214 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1217 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1218 const struct __ip6_tnl_parm *p)
1220 t->parms.laddr = p->laddr;
1221 t->parms.raddr = p->raddr;
1222 t->parms.flags = p->flags;
1223 t->parms.hop_limit = p->hop_limit;
1224 t->parms.encap_limit = p->encap_limit;
1225 t->parms.flowinfo = p->flowinfo;
1226 t->parms.link = p->link;
1227 t->parms.proto = p->proto;
1228 t->parms.i_key = p->i_key;
1229 t->parms.o_key = p->o_key;
1230 t->parms.i_flags = p->i_flags;
1231 t->parms.o_flags = p->o_flags;
1232 t->parms.fwmark = p->fwmark;
1233 t->parms.erspan_ver = p->erspan_ver;
1234 t->parms.index = p->index;
1235 t->parms.dir = p->dir;
1236 t->parms.hwid = p->hwid;
1237 dst_cache_reset(&t->dst_cache);
1240 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1243 ip6gre_tnl_copy_tnl_parm(t, p);
1244 ip6gre_tnl_link_config(t, set_mtu);
1248 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1249 const struct ip6_tnl_parm2 *u)
1251 p->laddr = u->laddr;
1252 p->raddr = u->raddr;
1253 p->flags = u->flags;
1254 p->hop_limit = u->hop_limit;
1255 p->encap_limit = u->encap_limit;
1256 p->flowinfo = u->flowinfo;
1258 p->i_key = u->i_key;
1259 p->o_key = u->o_key;
1260 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1261 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1262 memcpy(p->name, u->name, sizeof(u->name));
1265 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1266 const struct __ip6_tnl_parm *p)
1268 u->proto = IPPROTO_GRE;
1269 u->laddr = p->laddr;
1270 u->raddr = p->raddr;
1271 u->flags = p->flags;
1272 u->hop_limit = p->hop_limit;
1273 u->encap_limit = p->encap_limit;
1274 u->flowinfo = p->flowinfo;
1276 u->i_key = p->i_key;
1277 u->o_key = p->o_key;
1278 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1279 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1280 memcpy(u->name, p->name, sizeof(u->name));
1283 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1284 struct ifreq *ifr, void __user *data,
1288 struct ip6_tnl_parm2 p;
1289 struct __ip6_tnl_parm p1;
1290 struct ip6_tnl *t = netdev_priv(dev);
1291 struct net *net = t->net;
1292 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1294 memset(&p1, 0, sizeof(p1));
1298 if (dev == ign->fb_tunnel_dev) {
1299 if (copy_from_user(&p, data, sizeof(p))) {
1303 ip6gre_tnl_parm_from_user(&p1, &p);
1304 t = ip6gre_tunnel_locate(net, &p1, 0);
1306 t = netdev_priv(dev);
1308 memset(&p, 0, sizeof(p));
1309 ip6gre_tnl_parm_to_user(&p, &t->parms);
1310 if (copy_to_user(data, &p, sizeof(p)))
1317 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1321 if (copy_from_user(&p, data, sizeof(p)))
1325 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1328 if (!(p.i_flags&GRE_KEY))
1330 if (!(p.o_flags&GRE_KEY))
1333 ip6gre_tnl_parm_from_user(&p1, &p);
1334 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1336 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1338 if (t->dev != dev) {
1343 t = netdev_priv(dev);
1345 ip6gre_tunnel_unlink(ign, t);
1347 ip6gre_tnl_change(t, &p1, 1);
1348 ip6gre_tunnel_link(ign, t);
1349 netdev_state_change(dev);
1356 memset(&p, 0, sizeof(p));
1357 ip6gre_tnl_parm_to_user(&p, &t->parms);
1358 if (copy_to_user(data, &p, sizeof(p)))
1361 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1366 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1369 if (dev == ign->fb_tunnel_dev) {
1371 if (copy_from_user(&p, data, sizeof(p)))
1374 ip6gre_tnl_parm_from_user(&p1, &p);
1375 t = ip6gre_tunnel_locate(net, &p1, 0);
1379 if (t == netdev_priv(ign->fb_tunnel_dev))
1383 unregister_netdevice(dev);
1395 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1396 unsigned short type, const void *daddr,
1397 const void *saddr, unsigned int len)
1399 struct ip6_tnl *t = netdev_priv(dev);
1400 struct ipv6hdr *ipv6h;
1403 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1404 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1405 t->fl.u.ip6.flowlabel,
1406 true, &t->fl.u.ip6));
1407 ipv6h->hop_limit = t->parms.hop_limit;
1408 ipv6h->nexthdr = NEXTHDR_GRE;
1409 ipv6h->saddr = t->parms.laddr;
1410 ipv6h->daddr = t->parms.raddr;
1412 p = (__be16 *)(ipv6h + 1);
1413 p[0] = t->parms.o_flags;
1417 * Set the source hardware address.
1421 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1423 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1424 if (!ipv6_addr_any(&ipv6h->daddr))
1430 static const struct header_ops ip6gre_header_ops = {
1431 .create = ip6gre_header,
1434 static const struct net_device_ops ip6gre_netdev_ops = {
1435 .ndo_init = ip6gre_tunnel_init,
1436 .ndo_uninit = ip6gre_tunnel_uninit,
1437 .ndo_start_xmit = ip6gre_tunnel_xmit,
1438 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1439 .ndo_change_mtu = ip6_tnl_change_mtu,
1440 .ndo_get_stats64 = dev_get_tstats64,
1441 .ndo_get_iflink = ip6_tnl_get_iflink,
1444 static void ip6gre_dev_free(struct net_device *dev)
1446 struct ip6_tnl *t = netdev_priv(dev);
1448 gro_cells_destroy(&t->gro_cells);
1449 dst_cache_destroy(&t->dst_cache);
1450 free_percpu(dev->tstats);
1453 static void ip6gre_tunnel_setup(struct net_device *dev)
1455 dev->netdev_ops = &ip6gre_netdev_ops;
1456 dev->needs_free_netdev = true;
1457 dev->priv_destructor = ip6gre_dev_free;
1459 dev->type = ARPHRD_IP6GRE;
1461 dev->flags |= IFF_NOARP;
1462 dev->addr_len = sizeof(struct in6_addr);
1463 netif_keep_dst(dev);
1464 /* This perm addr will be used as interface identifier by IPv6 */
1465 dev->addr_assign_type = NET_ADDR_RANDOM;
1466 eth_random_addr(dev->perm_addr);
1469 #define GRE6_FEATURES (NETIF_F_SG | \
1470 NETIF_F_FRAGLIST | \
1474 static void ip6gre_tnl_init_features(struct net_device *dev)
1476 struct ip6_tnl *nt = netdev_priv(dev);
1479 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1480 dev->hw_features |= GRE6_FEATURES;
1482 flags = nt->parms.o_flags;
1484 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1485 * levels of outer headers requiring an update.
1487 if (flags & TUNNEL_SEQ)
1489 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1492 dev->features |= NETIF_F_GSO_SOFTWARE;
1493 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1496 static int ip6gre_tunnel_init_common(struct net_device *dev)
1498 struct ip6_tnl *tunnel;
1502 tunnel = netdev_priv(dev);
1505 tunnel->net = dev_net(dev);
1506 strcpy(tunnel->parms.name, dev->name);
1508 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1512 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1514 goto cleanup_alloc_pcpu_stats;
1516 ret = gro_cells_init(&tunnel->gro_cells, dev);
1518 goto cleanup_dst_cache_init;
1520 t_hlen = ip6gre_calc_hlen(tunnel);
1521 dev->mtu = ETH_DATA_LEN - t_hlen;
1522 if (dev->type == ARPHRD_ETHER)
1523 dev->mtu -= ETH_HLEN;
1524 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1527 if (tunnel->parms.collect_md) {
1528 netif_keep_dst(dev);
1530 ip6gre_tnl_init_features(dev);
1532 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1535 cleanup_dst_cache_init:
1536 dst_cache_destroy(&tunnel->dst_cache);
1537 cleanup_alloc_pcpu_stats:
1538 free_percpu(dev->tstats);
1543 static int ip6gre_tunnel_init(struct net_device *dev)
1545 struct ip6_tnl *tunnel;
1548 ret = ip6gre_tunnel_init_common(dev);
1552 tunnel = netdev_priv(dev);
1554 if (tunnel->parms.collect_md)
1557 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1558 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1560 if (ipv6_addr_any(&tunnel->parms.raddr))
1561 dev->header_ops = &ip6gre_header_ops;
1566 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1568 struct ip6_tnl *tunnel = netdev_priv(dev);
1571 tunnel->net = dev_net(dev);
1572 strcpy(tunnel->parms.name, dev->name);
1574 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1577 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1579 .err_handler = ip6gre_err,
1580 .flags = INET6_PROTO_FINAL,
1583 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1585 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1586 struct net_device *dev, *aux;
1589 for_each_netdev_safe(net, dev, aux)
1590 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1591 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1592 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1593 unregister_netdevice_queue(dev, head);
1595 for (prio = 0; prio < 4; prio++) {
1597 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1600 t = rtnl_dereference(ign->tunnels[prio][h]);
1603 /* If dev is in the same netns, it has already
1604 * been added to the list by the previous loop.
1606 if (!net_eq(dev_net(t->dev), net))
1607 unregister_netdevice_queue(t->dev,
1609 t = rtnl_dereference(t->next);
1615 static int __net_init ip6gre_init_net(struct net *net)
1617 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1618 struct net_device *ndev;
1621 if (!net_has_fallback_tunnels(net))
1623 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1624 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1629 ign->fb_tunnel_dev = ndev;
1630 dev_net_set(ign->fb_tunnel_dev, net);
1631 /* FB netdevice is special: we have one, and only one per netns.
1632 * Allowing to move it to another netns is clearly unsafe.
1634 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1637 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1638 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1640 err = register_netdev(ign->fb_tunnel_dev);
1644 rcu_assign_pointer(ign->tunnels_wc[0],
1645 netdev_priv(ign->fb_tunnel_dev));
1654 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1660 list_for_each_entry(net, net_list, exit_list)
1661 ip6gre_destroy_tunnels(net, &list);
1662 unregister_netdevice_many(&list);
1666 static struct pernet_operations ip6gre_net_ops = {
1667 .init = ip6gre_init_net,
1668 .exit_batch = ip6gre_exit_batch_net,
1669 .id = &ip6gre_net_id,
1670 .size = sizeof(struct ip6gre_net),
1673 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1674 struct netlink_ext_ack *extack)
1682 if (data[IFLA_GRE_IFLAGS])
1683 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1684 if (data[IFLA_GRE_OFLAGS])
1685 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1686 if (flags & (GRE_VERSION|GRE_ROUTING))
1692 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1693 struct netlink_ext_ack *extack)
1695 struct in6_addr daddr;
1697 if (tb[IFLA_ADDRESS]) {
1698 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1700 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1701 return -EADDRNOTAVAIL;
1707 if (data[IFLA_GRE_REMOTE]) {
1708 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1709 if (ipv6_addr_any(&daddr))
1714 return ip6gre_tunnel_validate(tb, data, extack);
1717 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1718 struct netlink_ext_ack *extack)
1726 ret = ip6gre_tap_validate(tb, data, extack);
1730 /* ERSPAN should only have GRE sequence and key flag */
1731 if (data[IFLA_GRE_OFLAGS])
1732 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1733 if (data[IFLA_GRE_IFLAGS])
1734 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1735 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1736 flags != (GRE_SEQ | GRE_KEY))
1739 /* ERSPAN Session ID only has 10-bit. Since we reuse
1740 * 32-bit key field as ID, check it's range.
1742 if (data[IFLA_GRE_IKEY] &&
1743 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1746 if (data[IFLA_GRE_OKEY] &&
1747 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1750 if (data[IFLA_GRE_ERSPAN_VER]) {
1751 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1752 if (ver != 1 && ver != 2)
1757 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1758 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1760 if (index & ~INDEX_MASK)
1763 } else if (ver == 2) {
1764 if (data[IFLA_GRE_ERSPAN_DIR]) {
1765 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1767 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1771 if (data[IFLA_GRE_ERSPAN_HWID]) {
1772 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1774 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1782 static void ip6erspan_set_version(struct nlattr *data[],
1783 struct __ip6_tnl_parm *parms)
1788 parms->erspan_ver = 1;
1789 if (data[IFLA_GRE_ERSPAN_VER])
1790 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1792 if (parms->erspan_ver == 1) {
1793 if (data[IFLA_GRE_ERSPAN_INDEX])
1794 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1795 } else if (parms->erspan_ver == 2) {
1796 if (data[IFLA_GRE_ERSPAN_DIR])
1797 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1798 if (data[IFLA_GRE_ERSPAN_HWID])
1799 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1803 static void ip6gre_netlink_parms(struct nlattr *data[],
1804 struct __ip6_tnl_parm *parms)
1806 memset(parms, 0, sizeof(*parms));
1811 if (data[IFLA_GRE_LINK])
1812 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1814 if (data[IFLA_GRE_IFLAGS])
1815 parms->i_flags = gre_flags_to_tnl_flags(
1816 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1818 if (data[IFLA_GRE_OFLAGS])
1819 parms->o_flags = gre_flags_to_tnl_flags(
1820 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1822 if (data[IFLA_GRE_IKEY])
1823 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1825 if (data[IFLA_GRE_OKEY])
1826 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1828 if (data[IFLA_GRE_LOCAL])
1829 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1831 if (data[IFLA_GRE_REMOTE])
1832 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1834 if (data[IFLA_GRE_TTL])
1835 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1837 if (data[IFLA_GRE_ENCAP_LIMIT])
1838 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1840 if (data[IFLA_GRE_FLOWINFO])
1841 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1843 if (data[IFLA_GRE_FLAGS])
1844 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1846 if (data[IFLA_GRE_FWMARK])
1847 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1849 if (data[IFLA_GRE_COLLECT_METADATA])
1850 parms->collect_md = true;
1853 static int ip6gre_tap_init(struct net_device *dev)
1857 ret = ip6gre_tunnel_init_common(dev);
1861 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1866 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1867 .ndo_init = ip6gre_tap_init,
1868 .ndo_uninit = ip6gre_tunnel_uninit,
1869 .ndo_start_xmit = ip6gre_tunnel_xmit,
1870 .ndo_set_mac_address = eth_mac_addr,
1871 .ndo_validate_addr = eth_validate_addr,
1872 .ndo_change_mtu = ip6_tnl_change_mtu,
1873 .ndo_get_stats64 = dev_get_tstats64,
1874 .ndo_get_iflink = ip6_tnl_get_iflink,
1877 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1881 tunnel->tun_hlen = 8;
1882 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1883 erspan_hdr_len(tunnel->parms.erspan_ver);
1885 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1886 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1890 static int ip6erspan_tap_init(struct net_device *dev)
1892 struct ip6_tnl *tunnel;
1896 tunnel = netdev_priv(dev);
1899 tunnel->net = dev_net(dev);
1900 strcpy(tunnel->parms.name, dev->name);
1902 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1906 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1908 goto cleanup_alloc_pcpu_stats;
1910 ret = gro_cells_init(&tunnel->gro_cells, dev);
1912 goto cleanup_dst_cache_init;
1914 t_hlen = ip6erspan_calc_hlen(tunnel);
1915 dev->mtu = ETH_DATA_LEN - t_hlen;
1916 if (dev->type == ARPHRD_ETHER)
1917 dev->mtu -= ETH_HLEN;
1918 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1921 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1922 ip6erspan_tnl_link_config(tunnel, 1);
1924 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1927 cleanup_dst_cache_init:
1928 dst_cache_destroy(&tunnel->dst_cache);
1929 cleanup_alloc_pcpu_stats:
1930 free_percpu(dev->tstats);
1935 static const struct net_device_ops ip6erspan_netdev_ops = {
1936 .ndo_init = ip6erspan_tap_init,
1937 .ndo_uninit = ip6erspan_tunnel_uninit,
1938 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1939 .ndo_set_mac_address = eth_mac_addr,
1940 .ndo_validate_addr = eth_validate_addr,
1941 .ndo_change_mtu = ip6_tnl_change_mtu,
1942 .ndo_get_stats64 = dev_get_tstats64,
1943 .ndo_get_iflink = ip6_tnl_get_iflink,
1946 static void ip6gre_tap_setup(struct net_device *dev)
1952 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1953 dev->needs_free_netdev = true;
1954 dev->priv_destructor = ip6gre_dev_free;
1956 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1957 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1958 netif_keep_dst(dev);
1961 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1962 struct ip_tunnel_encap *ipencap)
1966 memset(ipencap, 0, sizeof(*ipencap));
1971 if (data[IFLA_GRE_ENCAP_TYPE]) {
1973 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1976 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1978 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1981 if (data[IFLA_GRE_ENCAP_SPORT]) {
1983 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1986 if (data[IFLA_GRE_ENCAP_DPORT]) {
1988 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1994 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1995 struct nlattr *tb[], struct nlattr *data[],
1996 struct netlink_ext_ack *extack)
1999 struct ip_tunnel_encap ipencap;
2002 nt = netdev_priv(dev);
2004 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2005 int err = ip6_tnl_encap_setup(nt, &ipencap);
2011 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
2012 eth_hw_addr_random(dev);
2015 nt->net = dev_net(dev);
2017 err = register_netdevice(dev);
2022 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2028 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2029 struct nlattr *tb[], struct nlattr *data[],
2030 struct netlink_ext_ack *extack)
2032 struct ip6_tnl *nt = netdev_priv(dev);
2033 struct net *net = dev_net(dev);
2034 struct ip6gre_net *ign;
2037 ip6gre_netlink_parms(data, &nt->parms);
2038 ign = net_generic(net, ip6gre_net_id);
2040 if (nt->parms.collect_md) {
2041 if (rtnl_dereference(ign->collect_md_tun))
2044 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2048 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2050 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2051 ip6gre_tunnel_link_md(ign, nt);
2052 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2057 static struct ip6_tnl *
2058 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2059 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2060 struct netlink_ext_ack *extack)
2062 struct ip6_tnl *t, *nt = netdev_priv(dev);
2063 struct net *net = nt->net;
2064 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2065 struct ip_tunnel_encap ipencap;
2067 if (dev == ign->fb_tunnel_dev)
2068 return ERR_PTR(-EINVAL);
2070 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2071 int err = ip6_tnl_encap_setup(nt, &ipencap);
2074 return ERR_PTR(err);
2077 ip6gre_netlink_parms(data, p_p);
2079 t = ip6gre_tunnel_locate(net, p_p, 0);
2083 return ERR_PTR(-EEXIST);
2091 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2092 struct nlattr *data[],
2093 struct netlink_ext_ack *extack)
2095 struct ip6_tnl *t = netdev_priv(dev);
2096 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2097 struct __ip6_tnl_parm p;
2099 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2103 ip6gre_tunnel_unlink_md(ign, t);
2104 ip6gre_tunnel_unlink(ign, t);
2105 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2106 ip6gre_tunnel_link_md(ign, t);
2107 ip6gre_tunnel_link(ign, t);
2111 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2113 struct net *net = dev_net(dev);
2114 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2116 if (dev != ign->fb_tunnel_dev)
2117 unregister_netdevice_queue(dev, head);
2120 static size_t ip6gre_get_size(const struct net_device *dev)
2125 /* IFLA_GRE_IFLAGS */
2127 /* IFLA_GRE_OFLAGS */
2133 /* IFLA_GRE_LOCAL */
2134 nla_total_size(sizeof(struct in6_addr)) +
2135 /* IFLA_GRE_REMOTE */
2136 nla_total_size(sizeof(struct in6_addr)) +
2139 /* IFLA_GRE_ENCAP_LIMIT */
2141 /* IFLA_GRE_FLOWINFO */
2143 /* IFLA_GRE_FLAGS */
2145 /* IFLA_GRE_ENCAP_TYPE */
2147 /* IFLA_GRE_ENCAP_FLAGS */
2149 /* IFLA_GRE_ENCAP_SPORT */
2151 /* IFLA_GRE_ENCAP_DPORT */
2153 /* IFLA_GRE_COLLECT_METADATA */
2155 /* IFLA_GRE_FWMARK */
2157 /* IFLA_GRE_ERSPAN_INDEX */
2162 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2164 struct ip6_tnl *t = netdev_priv(dev);
2165 struct __ip6_tnl_parm *p = &t->parms;
2166 __be16 o_flags = p->o_flags;
2168 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2170 o_flags |= TUNNEL_KEY;
2172 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2173 goto nla_put_failure;
2175 if (p->erspan_ver == 1) {
2176 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2177 goto nla_put_failure;
2179 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2180 goto nla_put_failure;
2181 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2182 goto nla_put_failure;
2186 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2187 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2188 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2189 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2190 gre_tnl_flags_to_gre_flags(o_flags)) ||
2191 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2192 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2193 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2194 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2195 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2196 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2197 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2198 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2199 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2200 goto nla_put_failure;
2202 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2204 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2206 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2208 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2210 goto nla_put_failure;
2212 if (p->collect_md) {
2213 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2214 goto nla_put_failure;
2223 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2224 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2225 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2226 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2227 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2228 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2229 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2230 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2231 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2232 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2233 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2234 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2235 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2236 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2237 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2238 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2239 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2240 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2241 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2242 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2243 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2244 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2247 static void ip6erspan_tap_setup(struct net_device *dev)
2252 dev->netdev_ops = &ip6erspan_netdev_ops;
2253 dev->needs_free_netdev = true;
2254 dev->priv_destructor = ip6gre_dev_free;
2256 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2257 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2258 netif_keep_dst(dev);
2261 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2262 struct nlattr *tb[], struct nlattr *data[],
2263 struct netlink_ext_ack *extack)
2265 struct ip6_tnl *nt = netdev_priv(dev);
2266 struct net *net = dev_net(dev);
2267 struct ip6gre_net *ign;
2270 ip6gre_netlink_parms(data, &nt->parms);
2271 ip6erspan_set_version(data, &nt->parms);
2272 ign = net_generic(net, ip6gre_net_id);
2274 if (nt->parms.collect_md) {
2275 if (rtnl_dereference(ign->collect_md_tun_erspan))
2278 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2282 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2284 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2285 ip6erspan_tunnel_link_md(ign, nt);
2286 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2291 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2293 ip6gre_tnl_link_config_common(t);
2294 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2297 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2298 const struct __ip6_tnl_parm *p, int set_mtu)
2300 ip6gre_tnl_copy_tnl_parm(t, p);
2301 ip6erspan_tnl_link_config(t, set_mtu);
2305 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2306 struct nlattr *data[],
2307 struct netlink_ext_ack *extack)
2309 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2310 struct __ip6_tnl_parm p;
2313 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2317 ip6erspan_set_version(data, &p);
2318 ip6gre_tunnel_unlink_md(ign, t);
2319 ip6gre_tunnel_unlink(ign, t);
2320 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2321 ip6erspan_tunnel_link_md(ign, t);
2322 ip6gre_tunnel_link(ign, t);
2326 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2328 .maxtype = IFLA_GRE_MAX,
2329 .policy = ip6gre_policy,
2330 .priv_size = sizeof(struct ip6_tnl),
2331 .setup = ip6gre_tunnel_setup,
2332 .validate = ip6gre_tunnel_validate,
2333 .newlink = ip6gre_newlink,
2334 .changelink = ip6gre_changelink,
2335 .dellink = ip6gre_dellink,
2336 .get_size = ip6gre_get_size,
2337 .fill_info = ip6gre_fill_info,
2338 .get_link_net = ip6_tnl_get_link_net,
2341 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2342 .kind = "ip6gretap",
2343 .maxtype = IFLA_GRE_MAX,
2344 .policy = ip6gre_policy,
2345 .priv_size = sizeof(struct ip6_tnl),
2346 .setup = ip6gre_tap_setup,
2347 .validate = ip6gre_tap_validate,
2348 .newlink = ip6gre_newlink,
2349 .changelink = ip6gre_changelink,
2350 .get_size = ip6gre_get_size,
2351 .fill_info = ip6gre_fill_info,
2352 .get_link_net = ip6_tnl_get_link_net,
2355 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2356 .kind = "ip6erspan",
2357 .maxtype = IFLA_GRE_MAX,
2358 .policy = ip6gre_policy,
2359 .priv_size = sizeof(struct ip6_tnl),
2360 .setup = ip6erspan_tap_setup,
2361 .validate = ip6erspan_tap_validate,
2362 .newlink = ip6erspan_newlink,
2363 .changelink = ip6erspan_changelink,
2364 .get_size = ip6gre_get_size,
2365 .fill_info = ip6gre_fill_info,
2366 .get_link_net = ip6_tnl_get_link_net,
2370 * And now the modules code and kernel interface.
2373 static int __init ip6gre_init(void)
2377 pr_info("GRE over IPv6 tunneling driver\n");
2379 err = register_pernet_device(&ip6gre_net_ops);
2383 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2385 pr_info("%s: can't add protocol\n", __func__);
2386 goto add_proto_failed;
2389 err = rtnl_link_register(&ip6gre_link_ops);
2391 goto rtnl_link_failed;
2393 err = rtnl_link_register(&ip6gre_tap_ops);
2395 goto tap_ops_failed;
2397 err = rtnl_link_register(&ip6erspan_tap_ops);
2399 goto erspan_link_failed;
2405 rtnl_link_unregister(&ip6gre_tap_ops);
2407 rtnl_link_unregister(&ip6gre_link_ops);
2409 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2411 unregister_pernet_device(&ip6gre_net_ops);
2415 static void __exit ip6gre_fini(void)
2417 rtnl_link_unregister(&ip6gre_tap_ops);
2418 rtnl_link_unregister(&ip6gre_link_ops);
2419 rtnl_link_unregister(&ip6erspan_tap_ops);
2420 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2421 unregister_pernet_device(&ip6gre_net_ops);
2424 module_init(ip6gre_init);
2425 module_exit(ip6gre_fini);
2426 MODULE_LICENSE("GPL");
2427 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2428 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2429 MODULE_ALIAS_RTNL_LINK("ip6gre");
2430 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2431 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2432 MODULE_ALIAS_NETDEV("ip6gre0");