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);
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 dev_put_track(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 dev_put_track(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 struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
706 struct ip_tunnel_info *tun_info;
708 tun_info = skb_tunnel_info(skb);
709 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
710 return ERR_PTR(-EINVAL);
715 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
716 struct net_device *dev, __u8 dsfield,
717 struct flowi6 *fl6, int encap_limit,
718 __u32 *pmtu, __be16 proto)
720 struct ip6_tnl *tunnel = netdev_priv(dev);
724 if (dev->type == ARPHRD_ETHER)
725 IPCB(skb)->flags = 0;
727 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
728 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
730 fl6->daddr = tunnel->parms.raddr;
732 /* Push GRE header. */
733 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
735 if (tunnel->parms.collect_md) {
736 struct ip_tunnel_info *tun_info;
737 const struct ip_tunnel_key *key;
740 tun_info = skb_tunnel_info_txcheck(skb);
741 if (IS_ERR(tun_info) ||
742 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
745 key = &tun_info->key;
746 memset(fl6, 0, sizeof(*fl6));
747 fl6->flowi6_proto = IPPROTO_GRE;
748 fl6->daddr = key->u.ipv6.dst;
749 fl6->flowlabel = key->label;
750 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
751 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
754 flags = key->tun_flags &
755 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
756 tun_hlen = gre_calc_hlen(flags);
758 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
761 gre_build_header(skb, tun_hlen,
763 tunnel_id_to_key32(tun_info->key.tun_id),
764 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
768 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
771 flags = tunnel->parms.o_flags;
773 gre_build_header(skb, tunnel->tun_hlen, flags,
774 protocol, tunnel->parms.o_key,
775 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
779 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
783 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
785 struct ip6_tnl *t = netdev_priv(dev);
786 int encap_limit = -1;
792 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
794 if (!t->parms.collect_md)
795 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
796 &dsfield, &encap_limit);
798 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
802 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
805 /* XXX: send ICMP error even if DF is not set. */
806 if (err == -EMSGSIZE)
807 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
815 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
817 struct ip6_tnl *t = netdev_priv(dev);
818 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
819 int encap_limit = -1;
825 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
828 if (!t->parms.collect_md &&
829 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
832 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
835 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
836 &mtu, skb->protocol);
838 if (err == -EMSGSIZE)
839 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
847 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
848 * @t: the outgoing tunnel device
849 * @hdr: IPv6 header from the incoming packet
852 * Avoid trivial tunneling loop by checking that tunnel exit-point
853 * doesn't match source of incoming packet.
860 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
861 const struct ipv6hdr *hdr)
863 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
866 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
868 struct ip6_tnl *t = netdev_priv(dev);
869 int encap_limit = -1;
874 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
875 encap_limit = t->parms.encap_limit;
877 if (!t->parms.collect_md)
878 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
880 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
884 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
889 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
890 struct net_device *dev)
892 struct ip6_tnl *t = netdev_priv(dev);
893 struct net_device_stats *stats = &t->dev->stats;
896 if (!pskb_inet_may_pull(skb))
899 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
902 switch (skb->protocol) {
903 case htons(ETH_P_IP):
904 ret = ip6gre_xmit_ipv4(skb, dev);
906 case htons(ETH_P_IPV6):
907 ret = ip6gre_xmit_ipv6(skb, dev);
910 ret = ip6gre_xmit_other(skb, dev);
920 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
930 struct ip_tunnel_info *tun_info = NULL;
931 struct ip6_tnl *t = netdev_priv(dev);
932 struct dst_entry *dst = skb_dst(skb);
933 struct net_device_stats *stats;
934 bool truncate = false;
935 int encap_limit = -1;
936 __u8 dsfield = false;
944 if (!pskb_inet_may_pull(skb))
947 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
950 if (gre_handle_offloads(skb, false))
953 if (skb->len > dev->mtu + dev->hard_header_len) {
954 pskb_trim(skb, dev->mtu + dev->hard_header_len);
958 nhoff = skb_network_header(skb) - skb_mac_header(skb);
959 if (skb->protocol == htons(ETH_P_IP) &&
960 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
963 thoff = skb_transport_header(skb) - skb_mac_header(skb);
964 if (skb->protocol == htons(ETH_P_IPV6) &&
965 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
968 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
971 t->parms.o_flags &= ~TUNNEL_KEY;
972 IPCB(skb)->flags = 0;
974 /* For collect_md mode, derive fl6 from the tunnel key,
975 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
977 if (t->parms.collect_md) {
978 const struct ip_tunnel_key *key;
979 struct erspan_metadata *md;
982 tun_info = skb_tunnel_info_txcheck(skb);
983 if (IS_ERR(tun_info) ||
984 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
987 key = &tun_info->key;
988 memset(&fl6, 0, sizeof(fl6));
989 fl6.flowi6_proto = IPPROTO_GRE;
990 fl6.daddr = key->u.ipv6.dst;
991 fl6.flowlabel = key->label;
992 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
993 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
996 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
998 if (tun_info->options_len < sizeof(*md))
1000 md = ip_tunnel_info_opts(tun_info);
1002 tun_id = tunnel_id_to_key32(key->tun_id);
1003 if (md->version == 1) {
1004 erspan_build_header(skb,
1006 ntohl(md->u.index), truncate,
1008 } else if (md->version == 2) {
1009 erspan_build_header_v2(skb,
1012 get_hwid(&md->u.md2),
1018 switch (skb->protocol) {
1019 case htons(ETH_P_IP):
1020 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1021 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1022 &dsfield, &encap_limit);
1024 case htons(ETH_P_IPV6):
1025 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1027 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1028 &dsfield, &encap_limit))
1032 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1036 if (t->parms.erspan_ver == 1)
1037 erspan_build_header(skb, ntohl(t->parms.o_key),
1040 else if (t->parms.erspan_ver == 2)
1041 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1048 fl6.daddr = t->parms.raddr;
1051 /* Push GRE header. */
1052 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1053 : htons(ETH_P_ERSPAN2);
1054 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1056 /* TooBig packet may have updated dst->dev's mtu */
1057 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1058 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1060 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1063 /* XXX: send ICMP error even if DF is not set. */
1064 if (err == -EMSGSIZE) {
1065 if (skb->protocol == htons(ETH_P_IP))
1066 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1067 ICMP_FRAG_NEEDED, htonl(mtu));
1069 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1074 return NETDEV_TX_OK;
1077 stats = &t->dev->stats;
1078 if (!IS_ERR(tun_info))
1080 stats->tx_dropped++;
1082 return NETDEV_TX_OK;
1085 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1087 struct net_device *dev = t->dev;
1088 struct __ip6_tnl_parm *p = &t->parms;
1089 struct flowi6 *fl6 = &t->fl.u.ip6;
1091 if (dev->type != ARPHRD_ETHER) {
1092 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1093 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1096 /* Set up flowi template */
1097 fl6->saddr = p->laddr;
1098 fl6->daddr = p->raddr;
1099 fl6->flowi6_oif = p->link;
1101 fl6->flowi6_proto = IPPROTO_GRE;
1102 fl6->fl6_gre_key = t->parms.o_key;
1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1105 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1107 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1109 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1110 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1112 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1113 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1114 dev->flags |= IFF_POINTOPOINT;
1116 dev->flags &= ~IFF_POINTOPOINT;
1119 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1122 const struct __ip6_tnl_parm *p = &t->parms;
1123 struct net_device *dev = t->dev;
1125 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1126 int strict = (ipv6_addr_type(&p->raddr) &
1127 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1129 struct rt6_info *rt = rt6_lookup(t->net,
1130 &p->raddr, &p->laddr,
1131 p->link, NULL, strict);
1137 unsigned short dst_len = rt->dst.dev->hard_header_len +
1140 if (t->dev->header_ops)
1141 dev->hard_header_len = dst_len;
1143 dev->needed_headroom = dst_len;
1146 dev->mtu = rt->dst.dev->mtu - t_hlen;
1147 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1149 if (dev->type == ARPHRD_ETHER)
1150 dev->mtu -= ETH_HLEN;
1152 if (dev->mtu < IPV6_MIN_MTU)
1153 dev->mtu = IPV6_MIN_MTU;
1160 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1164 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1165 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1167 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1169 if (tunnel->dev->header_ops)
1170 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1172 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1177 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1179 ip6gre_tnl_link_config_common(t);
1180 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1183 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1184 const struct __ip6_tnl_parm *p)
1186 t->parms.laddr = p->laddr;
1187 t->parms.raddr = p->raddr;
1188 t->parms.flags = p->flags;
1189 t->parms.hop_limit = p->hop_limit;
1190 t->parms.encap_limit = p->encap_limit;
1191 t->parms.flowinfo = p->flowinfo;
1192 t->parms.link = p->link;
1193 t->parms.proto = p->proto;
1194 t->parms.i_key = p->i_key;
1195 t->parms.o_key = p->o_key;
1196 t->parms.i_flags = p->i_flags;
1197 t->parms.o_flags = p->o_flags;
1198 t->parms.fwmark = p->fwmark;
1199 t->parms.erspan_ver = p->erspan_ver;
1200 t->parms.index = p->index;
1201 t->parms.dir = p->dir;
1202 t->parms.hwid = p->hwid;
1203 dst_cache_reset(&t->dst_cache);
1206 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1209 ip6gre_tnl_copy_tnl_parm(t, p);
1210 ip6gre_tnl_link_config(t, set_mtu);
1214 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1215 const struct ip6_tnl_parm2 *u)
1217 p->laddr = u->laddr;
1218 p->raddr = u->raddr;
1219 p->flags = u->flags;
1220 p->hop_limit = u->hop_limit;
1221 p->encap_limit = u->encap_limit;
1222 p->flowinfo = u->flowinfo;
1224 p->i_key = u->i_key;
1225 p->o_key = u->o_key;
1226 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1227 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1228 memcpy(p->name, u->name, sizeof(u->name));
1231 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1232 const struct __ip6_tnl_parm *p)
1234 u->proto = IPPROTO_GRE;
1235 u->laddr = p->laddr;
1236 u->raddr = p->raddr;
1237 u->flags = p->flags;
1238 u->hop_limit = p->hop_limit;
1239 u->encap_limit = p->encap_limit;
1240 u->flowinfo = p->flowinfo;
1242 u->i_key = p->i_key;
1243 u->o_key = p->o_key;
1244 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1245 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1246 memcpy(u->name, p->name, sizeof(u->name));
1249 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1250 struct ifreq *ifr, void __user *data,
1254 struct ip6_tnl_parm2 p;
1255 struct __ip6_tnl_parm p1;
1256 struct ip6_tnl *t = netdev_priv(dev);
1257 struct net *net = t->net;
1258 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1260 memset(&p1, 0, sizeof(p1));
1264 if (dev == ign->fb_tunnel_dev) {
1265 if (copy_from_user(&p, data, sizeof(p))) {
1269 ip6gre_tnl_parm_from_user(&p1, &p);
1270 t = ip6gre_tunnel_locate(net, &p1, 0);
1272 t = netdev_priv(dev);
1274 memset(&p, 0, sizeof(p));
1275 ip6gre_tnl_parm_to_user(&p, &t->parms);
1276 if (copy_to_user(data, &p, sizeof(p)))
1283 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1287 if (copy_from_user(&p, data, sizeof(p)))
1291 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1294 if (!(p.i_flags&GRE_KEY))
1296 if (!(p.o_flags&GRE_KEY))
1299 ip6gre_tnl_parm_from_user(&p1, &p);
1300 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1302 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1304 if (t->dev != dev) {
1309 t = netdev_priv(dev);
1311 ip6gre_tunnel_unlink(ign, t);
1313 ip6gre_tnl_change(t, &p1, 1);
1314 ip6gre_tunnel_link(ign, t);
1315 netdev_state_change(dev);
1322 memset(&p, 0, sizeof(p));
1323 ip6gre_tnl_parm_to_user(&p, &t->parms);
1324 if (copy_to_user(data, &p, sizeof(p)))
1327 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1332 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1335 if (dev == ign->fb_tunnel_dev) {
1337 if (copy_from_user(&p, data, sizeof(p)))
1340 ip6gre_tnl_parm_from_user(&p1, &p);
1341 t = ip6gre_tunnel_locate(net, &p1, 0);
1345 if (t == netdev_priv(ign->fb_tunnel_dev))
1349 unregister_netdevice(dev);
1361 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1362 unsigned short type, const void *daddr,
1363 const void *saddr, unsigned int len)
1365 struct ip6_tnl *t = netdev_priv(dev);
1366 struct ipv6hdr *ipv6h;
1369 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1370 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1371 t->fl.u.ip6.flowlabel,
1372 true, &t->fl.u.ip6));
1373 ipv6h->hop_limit = t->parms.hop_limit;
1374 ipv6h->nexthdr = NEXTHDR_GRE;
1375 ipv6h->saddr = t->parms.laddr;
1376 ipv6h->daddr = t->parms.raddr;
1378 p = (__be16 *)(ipv6h + 1);
1379 p[0] = t->parms.o_flags;
1383 * Set the source hardware address.
1387 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1389 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1390 if (!ipv6_addr_any(&ipv6h->daddr))
1396 static const struct header_ops ip6gre_header_ops = {
1397 .create = ip6gre_header,
1400 static const struct net_device_ops ip6gre_netdev_ops = {
1401 .ndo_init = ip6gre_tunnel_init,
1402 .ndo_uninit = ip6gre_tunnel_uninit,
1403 .ndo_start_xmit = ip6gre_tunnel_xmit,
1404 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1405 .ndo_change_mtu = ip6_tnl_change_mtu,
1406 .ndo_get_stats64 = dev_get_tstats64,
1407 .ndo_get_iflink = ip6_tnl_get_iflink,
1410 static void ip6gre_dev_free(struct net_device *dev)
1412 struct ip6_tnl *t = netdev_priv(dev);
1414 gro_cells_destroy(&t->gro_cells);
1415 dst_cache_destroy(&t->dst_cache);
1416 free_percpu(dev->tstats);
1419 static void ip6gre_tunnel_setup(struct net_device *dev)
1421 dev->netdev_ops = &ip6gre_netdev_ops;
1422 dev->needs_free_netdev = true;
1423 dev->priv_destructor = ip6gre_dev_free;
1425 dev->type = ARPHRD_IP6GRE;
1427 dev->flags |= IFF_NOARP;
1428 dev->addr_len = sizeof(struct in6_addr);
1429 netif_keep_dst(dev);
1430 /* This perm addr will be used as interface identifier by IPv6 */
1431 dev->addr_assign_type = NET_ADDR_RANDOM;
1432 eth_random_addr(dev->perm_addr);
1435 #define GRE6_FEATURES (NETIF_F_SG | \
1436 NETIF_F_FRAGLIST | \
1440 static void ip6gre_tnl_init_features(struct net_device *dev)
1442 struct ip6_tnl *nt = netdev_priv(dev);
1445 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1446 dev->hw_features |= GRE6_FEATURES;
1448 flags = nt->parms.o_flags;
1450 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1451 * levels of outer headers requiring an update.
1453 if (flags & TUNNEL_SEQ)
1455 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1458 dev->features |= NETIF_F_GSO_SOFTWARE;
1459 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1462 static int ip6gre_tunnel_init_common(struct net_device *dev)
1464 struct ip6_tnl *tunnel;
1468 tunnel = netdev_priv(dev);
1471 tunnel->net = dev_net(dev);
1472 strcpy(tunnel->parms.name, dev->name);
1474 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1478 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1480 goto cleanup_alloc_pcpu_stats;
1482 ret = gro_cells_init(&tunnel->gro_cells, dev);
1484 goto cleanup_dst_cache_init;
1486 t_hlen = ip6gre_calc_hlen(tunnel);
1487 dev->mtu = ETH_DATA_LEN - t_hlen;
1488 if (dev->type == ARPHRD_ETHER)
1489 dev->mtu -= ETH_HLEN;
1490 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1493 if (tunnel->parms.collect_md) {
1494 netif_keep_dst(dev);
1496 ip6gre_tnl_init_features(dev);
1498 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
1501 cleanup_dst_cache_init:
1502 dst_cache_destroy(&tunnel->dst_cache);
1503 cleanup_alloc_pcpu_stats:
1504 free_percpu(dev->tstats);
1509 static int ip6gre_tunnel_init(struct net_device *dev)
1511 struct ip6_tnl *tunnel;
1514 ret = ip6gre_tunnel_init_common(dev);
1518 tunnel = netdev_priv(dev);
1520 if (tunnel->parms.collect_md)
1523 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1524 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1526 if (ipv6_addr_any(&tunnel->parms.raddr))
1527 dev->header_ops = &ip6gre_header_ops;
1532 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1534 struct ip6_tnl *tunnel = netdev_priv(dev);
1537 tunnel->net = dev_net(dev);
1538 strcpy(tunnel->parms.name, dev->name);
1540 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1543 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1545 .err_handler = ip6gre_err,
1546 .flags = INET6_PROTO_FINAL,
1549 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1551 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1552 struct net_device *dev, *aux;
1555 for_each_netdev_safe(net, dev, aux)
1556 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1557 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1558 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1559 unregister_netdevice_queue(dev, head);
1561 for (prio = 0; prio < 4; prio++) {
1563 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1566 t = rtnl_dereference(ign->tunnels[prio][h]);
1569 /* If dev is in the same netns, it has already
1570 * been added to the list by the previous loop.
1572 if (!net_eq(dev_net(t->dev), net))
1573 unregister_netdevice_queue(t->dev,
1575 t = rtnl_dereference(t->next);
1581 static int __net_init ip6gre_init_net(struct net *net)
1583 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1584 struct net_device *ndev;
1587 if (!net_has_fallback_tunnels(net))
1589 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1590 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1595 ign->fb_tunnel_dev = ndev;
1596 dev_net_set(ign->fb_tunnel_dev, net);
1597 /* FB netdevice is special: we have one, and only one per netns.
1598 * Allowing to move it to another netns is clearly unsafe.
1600 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1603 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1604 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1606 err = register_netdev(ign->fb_tunnel_dev);
1610 rcu_assign_pointer(ign->tunnels_wc[0],
1611 netdev_priv(ign->fb_tunnel_dev));
1620 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1626 list_for_each_entry(net, net_list, exit_list)
1627 ip6gre_destroy_tunnels(net, &list);
1628 unregister_netdevice_many(&list);
1632 static struct pernet_operations ip6gre_net_ops = {
1633 .init = ip6gre_init_net,
1634 .exit_batch = ip6gre_exit_batch_net,
1635 .id = &ip6gre_net_id,
1636 .size = sizeof(struct ip6gre_net),
1639 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1640 struct netlink_ext_ack *extack)
1648 if (data[IFLA_GRE_IFLAGS])
1649 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1650 if (data[IFLA_GRE_OFLAGS])
1651 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1652 if (flags & (GRE_VERSION|GRE_ROUTING))
1658 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1659 struct netlink_ext_ack *extack)
1661 struct in6_addr daddr;
1663 if (tb[IFLA_ADDRESS]) {
1664 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1666 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1667 return -EADDRNOTAVAIL;
1673 if (data[IFLA_GRE_REMOTE]) {
1674 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1675 if (ipv6_addr_any(&daddr))
1680 return ip6gre_tunnel_validate(tb, data, extack);
1683 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1684 struct netlink_ext_ack *extack)
1692 ret = ip6gre_tap_validate(tb, data, extack);
1696 /* ERSPAN should only have GRE sequence and key flag */
1697 if (data[IFLA_GRE_OFLAGS])
1698 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1699 if (data[IFLA_GRE_IFLAGS])
1700 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1701 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1702 flags != (GRE_SEQ | GRE_KEY))
1705 /* ERSPAN Session ID only has 10-bit. Since we reuse
1706 * 32-bit key field as ID, check it's range.
1708 if (data[IFLA_GRE_IKEY] &&
1709 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1712 if (data[IFLA_GRE_OKEY] &&
1713 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1716 if (data[IFLA_GRE_ERSPAN_VER]) {
1717 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1718 if (ver != 1 && ver != 2)
1723 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1724 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1726 if (index & ~INDEX_MASK)
1729 } else if (ver == 2) {
1730 if (data[IFLA_GRE_ERSPAN_DIR]) {
1731 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1733 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1737 if (data[IFLA_GRE_ERSPAN_HWID]) {
1738 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1740 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1748 static void ip6erspan_set_version(struct nlattr *data[],
1749 struct __ip6_tnl_parm *parms)
1754 parms->erspan_ver = 1;
1755 if (data[IFLA_GRE_ERSPAN_VER])
1756 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1758 if (parms->erspan_ver == 1) {
1759 if (data[IFLA_GRE_ERSPAN_INDEX])
1760 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1761 } else if (parms->erspan_ver == 2) {
1762 if (data[IFLA_GRE_ERSPAN_DIR])
1763 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1764 if (data[IFLA_GRE_ERSPAN_HWID])
1765 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1769 static void ip6gre_netlink_parms(struct nlattr *data[],
1770 struct __ip6_tnl_parm *parms)
1772 memset(parms, 0, sizeof(*parms));
1777 if (data[IFLA_GRE_LINK])
1778 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1780 if (data[IFLA_GRE_IFLAGS])
1781 parms->i_flags = gre_flags_to_tnl_flags(
1782 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1784 if (data[IFLA_GRE_OFLAGS])
1785 parms->o_flags = gre_flags_to_tnl_flags(
1786 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1788 if (data[IFLA_GRE_IKEY])
1789 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1791 if (data[IFLA_GRE_OKEY])
1792 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1794 if (data[IFLA_GRE_LOCAL])
1795 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1797 if (data[IFLA_GRE_REMOTE])
1798 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1800 if (data[IFLA_GRE_TTL])
1801 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1803 if (data[IFLA_GRE_ENCAP_LIMIT])
1804 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1806 if (data[IFLA_GRE_FLOWINFO])
1807 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1809 if (data[IFLA_GRE_FLAGS])
1810 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1812 if (data[IFLA_GRE_FWMARK])
1813 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1815 if (data[IFLA_GRE_COLLECT_METADATA])
1816 parms->collect_md = true;
1819 static int ip6gre_tap_init(struct net_device *dev)
1823 ret = ip6gre_tunnel_init_common(dev);
1827 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1832 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1833 .ndo_init = ip6gre_tap_init,
1834 .ndo_uninit = ip6gre_tunnel_uninit,
1835 .ndo_start_xmit = ip6gre_tunnel_xmit,
1836 .ndo_set_mac_address = eth_mac_addr,
1837 .ndo_validate_addr = eth_validate_addr,
1838 .ndo_change_mtu = ip6_tnl_change_mtu,
1839 .ndo_get_stats64 = dev_get_tstats64,
1840 .ndo_get_iflink = ip6_tnl_get_iflink,
1843 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1847 tunnel->tun_hlen = 8;
1848 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1849 erspan_hdr_len(tunnel->parms.erspan_ver);
1851 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1852 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1856 static int ip6erspan_tap_init(struct net_device *dev)
1858 struct ip6_tnl *tunnel;
1862 tunnel = netdev_priv(dev);
1865 tunnel->net = dev_net(dev);
1866 strcpy(tunnel->parms.name, dev->name);
1868 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1872 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1874 goto cleanup_alloc_pcpu_stats;
1876 ret = gro_cells_init(&tunnel->gro_cells, dev);
1878 goto cleanup_dst_cache_init;
1880 t_hlen = ip6erspan_calc_hlen(tunnel);
1881 dev->mtu = ETH_DATA_LEN - t_hlen;
1882 if (dev->type == ARPHRD_ETHER)
1883 dev->mtu -= ETH_HLEN;
1884 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1887 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1888 ip6erspan_tnl_link_config(tunnel, 1);
1890 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
1893 cleanup_dst_cache_init:
1894 dst_cache_destroy(&tunnel->dst_cache);
1895 cleanup_alloc_pcpu_stats:
1896 free_percpu(dev->tstats);
1901 static const struct net_device_ops ip6erspan_netdev_ops = {
1902 .ndo_init = ip6erspan_tap_init,
1903 .ndo_uninit = ip6erspan_tunnel_uninit,
1904 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1905 .ndo_set_mac_address = eth_mac_addr,
1906 .ndo_validate_addr = eth_validate_addr,
1907 .ndo_change_mtu = ip6_tnl_change_mtu,
1908 .ndo_get_stats64 = dev_get_tstats64,
1909 .ndo_get_iflink = ip6_tnl_get_iflink,
1912 static void ip6gre_tap_setup(struct net_device *dev)
1918 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1919 dev->needs_free_netdev = true;
1920 dev->priv_destructor = ip6gre_dev_free;
1922 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1923 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1924 netif_keep_dst(dev);
1927 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1928 struct ip_tunnel_encap *ipencap)
1932 memset(ipencap, 0, sizeof(*ipencap));
1937 if (data[IFLA_GRE_ENCAP_TYPE]) {
1939 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1942 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1944 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1947 if (data[IFLA_GRE_ENCAP_SPORT]) {
1949 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1952 if (data[IFLA_GRE_ENCAP_DPORT]) {
1954 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1960 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1961 struct nlattr *tb[], struct nlattr *data[],
1962 struct netlink_ext_ack *extack)
1965 struct ip_tunnel_encap ipencap;
1968 nt = netdev_priv(dev);
1970 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1971 int err = ip6_tnl_encap_setup(nt, &ipencap);
1977 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1978 eth_hw_addr_random(dev);
1981 nt->net = dev_net(dev);
1983 err = register_netdevice(dev);
1988 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1994 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1995 struct nlattr *tb[], struct nlattr *data[],
1996 struct netlink_ext_ack *extack)
1998 struct ip6_tnl *nt = netdev_priv(dev);
1999 struct net *net = dev_net(dev);
2000 struct ip6gre_net *ign;
2003 ip6gre_netlink_parms(data, &nt->parms);
2004 ign = net_generic(net, ip6gre_net_id);
2006 if (nt->parms.collect_md) {
2007 if (rtnl_dereference(ign->collect_md_tun))
2010 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2014 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2016 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2017 ip6gre_tunnel_link_md(ign, nt);
2018 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2023 static struct ip6_tnl *
2024 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2025 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2026 struct netlink_ext_ack *extack)
2028 struct ip6_tnl *t, *nt = netdev_priv(dev);
2029 struct net *net = nt->net;
2030 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2031 struct ip_tunnel_encap ipencap;
2033 if (dev == ign->fb_tunnel_dev)
2034 return ERR_PTR(-EINVAL);
2036 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2037 int err = ip6_tnl_encap_setup(nt, &ipencap);
2040 return ERR_PTR(err);
2043 ip6gre_netlink_parms(data, p_p);
2045 t = ip6gre_tunnel_locate(net, p_p, 0);
2049 return ERR_PTR(-EEXIST);
2057 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2058 struct nlattr *data[],
2059 struct netlink_ext_ack *extack)
2061 struct ip6_tnl *t = netdev_priv(dev);
2062 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2063 struct __ip6_tnl_parm p;
2065 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2069 ip6gre_tunnel_unlink_md(ign, t);
2070 ip6gre_tunnel_unlink(ign, t);
2071 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2072 ip6gre_tunnel_link_md(ign, t);
2073 ip6gre_tunnel_link(ign, t);
2077 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2079 struct net *net = dev_net(dev);
2080 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2082 if (dev != ign->fb_tunnel_dev)
2083 unregister_netdevice_queue(dev, head);
2086 static size_t ip6gre_get_size(const struct net_device *dev)
2091 /* IFLA_GRE_IFLAGS */
2093 /* IFLA_GRE_OFLAGS */
2099 /* IFLA_GRE_LOCAL */
2100 nla_total_size(sizeof(struct in6_addr)) +
2101 /* IFLA_GRE_REMOTE */
2102 nla_total_size(sizeof(struct in6_addr)) +
2105 /* IFLA_GRE_ENCAP_LIMIT */
2107 /* IFLA_GRE_FLOWINFO */
2109 /* IFLA_GRE_FLAGS */
2111 /* IFLA_GRE_ENCAP_TYPE */
2113 /* IFLA_GRE_ENCAP_FLAGS */
2115 /* IFLA_GRE_ENCAP_SPORT */
2117 /* IFLA_GRE_ENCAP_DPORT */
2119 /* IFLA_GRE_COLLECT_METADATA */
2121 /* IFLA_GRE_FWMARK */
2123 /* IFLA_GRE_ERSPAN_INDEX */
2128 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2130 struct ip6_tnl *t = netdev_priv(dev);
2131 struct __ip6_tnl_parm *p = &t->parms;
2132 __be16 o_flags = p->o_flags;
2134 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2136 o_flags |= TUNNEL_KEY;
2138 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2139 goto nla_put_failure;
2141 if (p->erspan_ver == 1) {
2142 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2143 goto nla_put_failure;
2145 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2146 goto nla_put_failure;
2147 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2148 goto nla_put_failure;
2152 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2153 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2154 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2155 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2156 gre_tnl_flags_to_gre_flags(o_flags)) ||
2157 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2158 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2159 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2160 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2161 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2162 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2163 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2164 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2165 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2166 goto nla_put_failure;
2168 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2170 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2172 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2174 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2176 goto nla_put_failure;
2178 if (p->collect_md) {
2179 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2180 goto nla_put_failure;
2189 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2190 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2191 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2192 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2193 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2194 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2195 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2196 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2197 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2198 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2199 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2200 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2201 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2202 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2203 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2204 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2205 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2206 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2207 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2208 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2209 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2210 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2213 static void ip6erspan_tap_setup(struct net_device *dev)
2218 dev->netdev_ops = &ip6erspan_netdev_ops;
2219 dev->needs_free_netdev = true;
2220 dev->priv_destructor = ip6gre_dev_free;
2222 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2223 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2224 netif_keep_dst(dev);
2227 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2228 struct nlattr *tb[], struct nlattr *data[],
2229 struct netlink_ext_ack *extack)
2231 struct ip6_tnl *nt = netdev_priv(dev);
2232 struct net *net = dev_net(dev);
2233 struct ip6gre_net *ign;
2236 ip6gre_netlink_parms(data, &nt->parms);
2237 ip6erspan_set_version(data, &nt->parms);
2238 ign = net_generic(net, ip6gre_net_id);
2240 if (nt->parms.collect_md) {
2241 if (rtnl_dereference(ign->collect_md_tun_erspan))
2244 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2248 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2250 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2251 ip6erspan_tunnel_link_md(ign, nt);
2252 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2257 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2259 ip6gre_tnl_link_config_common(t);
2260 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2263 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2264 const struct __ip6_tnl_parm *p, int set_mtu)
2266 ip6gre_tnl_copy_tnl_parm(t, p);
2267 ip6erspan_tnl_link_config(t, set_mtu);
2271 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2272 struct nlattr *data[],
2273 struct netlink_ext_ack *extack)
2275 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2276 struct __ip6_tnl_parm p;
2279 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2283 ip6erspan_set_version(data, &p);
2284 ip6gre_tunnel_unlink_md(ign, t);
2285 ip6gre_tunnel_unlink(ign, t);
2286 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2287 ip6erspan_tunnel_link_md(ign, t);
2288 ip6gre_tunnel_link(ign, t);
2292 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2294 .maxtype = IFLA_GRE_MAX,
2295 .policy = ip6gre_policy,
2296 .priv_size = sizeof(struct ip6_tnl),
2297 .setup = ip6gre_tunnel_setup,
2298 .validate = ip6gre_tunnel_validate,
2299 .newlink = ip6gre_newlink,
2300 .changelink = ip6gre_changelink,
2301 .dellink = ip6gre_dellink,
2302 .get_size = ip6gre_get_size,
2303 .fill_info = ip6gre_fill_info,
2304 .get_link_net = ip6_tnl_get_link_net,
2307 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2308 .kind = "ip6gretap",
2309 .maxtype = IFLA_GRE_MAX,
2310 .policy = ip6gre_policy,
2311 .priv_size = sizeof(struct ip6_tnl),
2312 .setup = ip6gre_tap_setup,
2313 .validate = ip6gre_tap_validate,
2314 .newlink = ip6gre_newlink,
2315 .changelink = ip6gre_changelink,
2316 .get_size = ip6gre_get_size,
2317 .fill_info = ip6gre_fill_info,
2318 .get_link_net = ip6_tnl_get_link_net,
2321 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2322 .kind = "ip6erspan",
2323 .maxtype = IFLA_GRE_MAX,
2324 .policy = ip6gre_policy,
2325 .priv_size = sizeof(struct ip6_tnl),
2326 .setup = ip6erspan_tap_setup,
2327 .validate = ip6erspan_tap_validate,
2328 .newlink = ip6erspan_newlink,
2329 .changelink = ip6erspan_changelink,
2330 .get_size = ip6gre_get_size,
2331 .fill_info = ip6gre_fill_info,
2332 .get_link_net = ip6_tnl_get_link_net,
2336 * And now the modules code and kernel interface.
2339 static int __init ip6gre_init(void)
2343 pr_info("GRE over IPv6 tunneling driver\n");
2345 err = register_pernet_device(&ip6gre_net_ops);
2349 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2351 pr_info("%s: can't add protocol\n", __func__);
2352 goto add_proto_failed;
2355 err = rtnl_link_register(&ip6gre_link_ops);
2357 goto rtnl_link_failed;
2359 err = rtnl_link_register(&ip6gre_tap_ops);
2361 goto tap_ops_failed;
2363 err = rtnl_link_register(&ip6erspan_tap_ops);
2365 goto erspan_link_failed;
2371 rtnl_link_unregister(&ip6gre_tap_ops);
2373 rtnl_link_unregister(&ip6gre_link_ops);
2375 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2377 unregister_pernet_device(&ip6gre_net_ops);
2381 static void __exit ip6gre_fini(void)
2383 rtnl_link_unregister(&ip6gre_tap_ops);
2384 rtnl_link_unregister(&ip6gre_link_ops);
2385 rtnl_link_unregister(&ip6erspan_tap_ops);
2386 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2387 unregister_pernet_device(&ip6gre_net_ops);
2390 module_init(ip6gre_init);
2391 module_exit(ip6gre_fini);
2392 MODULE_LICENSE("GPL");
2393 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2394 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2395 MODULE_ALIAS_RTNL_LINK("ip6gre");
2396 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2397 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2398 MODULE_ALIAS_NETDEV("ip6gre0");