1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2013 Nicira, Inc.
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 #include <linux/capability.h>
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/uaccess.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
17 #include <linux/tcp.h>
18 #include <linux/udp.h>
19 #include <linux/if_arp.h>
20 #include <linux/init.h>
21 #include <linux/in6.h>
22 #include <linux/inetdevice.h>
23 #include <linux/igmp.h>
24 #include <linux/netfilter_ipv4.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/rculist.h>
29 #include <linux/err.h>
34 #include <net/protocol.h>
35 #include <net/ip_tunnels.h>
37 #include <net/checksum.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/rtnetlink.h>
45 #include <net/dst_metadata.h>
47 #if IS_ENABLED(CONFIG_IPV6)
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
53 static unsigned int ip_tunnel_hash(__be32 key, __be32 remote)
55 return hash_32((__force u32)key ^ (__force u32)remote,
59 static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
60 __be16 flags, __be32 key)
62 if (p->i_flags & TUNNEL_KEY) {
63 if (flags & TUNNEL_KEY)
64 return key == p->i_key;
66 /* key expected, none present */
69 return !(flags & TUNNEL_KEY);
72 /* Fallback tunnel: no source, no destination, no key, no options
75 We require exact key match i.e. if a key is present in packet
76 it will match only tunnel with the same key; if it is not present,
77 it will match only keyless tunnel.
79 All keysless packets, if not matched configured keyless tunnels
80 will match fallback tunnel.
81 Given src, dst and key, find appropriate for input tunnel.
83 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
84 int link, __be16 flags,
85 __be32 remote, __be32 local,
88 struct ip_tunnel *t, *cand = NULL;
89 struct hlist_head *head;
90 struct net_device *ndev;
93 hash = ip_tunnel_hash(key, remote);
94 head = &itn->tunnels[hash];
96 hlist_for_each_entry_rcu(t, head, hash_node) {
97 if (local != t->parms.iph.saddr ||
98 remote != t->parms.iph.daddr ||
99 !(t->dev->flags & IFF_UP))
102 if (!ip_tunnel_key_match(&t->parms, flags, key))
105 if (t->parms.link == link)
111 hlist_for_each_entry_rcu(t, head, hash_node) {
112 if (remote != t->parms.iph.daddr ||
113 t->parms.iph.saddr != 0 ||
114 !(t->dev->flags & IFF_UP))
117 if (!ip_tunnel_key_match(&t->parms, flags, key))
120 if (t->parms.link == link)
126 hash = ip_tunnel_hash(key, 0);
127 head = &itn->tunnels[hash];
129 hlist_for_each_entry_rcu(t, head, hash_node) {
130 if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) &&
131 (local != t->parms.iph.daddr || !ipv4_is_multicast(local)))
134 if (!(t->dev->flags & IFF_UP))
137 if (!ip_tunnel_key_match(&t->parms, flags, key))
140 if (t->parms.link == link)
146 hlist_for_each_entry_rcu(t, head, hash_node) {
147 if ((!(flags & TUNNEL_NO_KEY) && t->parms.i_key != key) ||
148 t->parms.iph.saddr != 0 ||
149 t->parms.iph.daddr != 0 ||
150 !(t->dev->flags & IFF_UP))
153 if (t->parms.link == link)
162 t = rcu_dereference(itn->collect_md_tun);
163 if (t && t->dev->flags & IFF_UP)
166 ndev = READ_ONCE(itn->fb_tunnel_dev);
167 if (ndev && ndev->flags & IFF_UP)
168 return netdev_priv(ndev);
172 EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
174 static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
175 struct ip_tunnel_parm *parms)
179 __be32 i_key = parms->i_key;
181 if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
182 remote = parms->iph.daddr;
186 if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI))
189 h = ip_tunnel_hash(i_key, remote);
190 return &itn->tunnels[h];
193 static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
195 struct hlist_head *head = ip_bucket(itn, &t->parms);
198 rcu_assign_pointer(itn->collect_md_tun, t);
199 hlist_add_head_rcu(&t->hash_node, head);
202 static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t)
205 rcu_assign_pointer(itn->collect_md_tun, NULL);
206 hlist_del_init_rcu(&t->hash_node);
209 static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
210 struct ip_tunnel_parm *parms,
213 __be32 remote = parms->iph.daddr;
214 __be32 local = parms->iph.saddr;
215 __be32 key = parms->i_key;
216 __be16 flags = parms->i_flags;
217 int link = parms->link;
218 struct ip_tunnel *t = NULL;
219 struct hlist_head *head = ip_bucket(itn, parms);
221 hlist_for_each_entry_rcu(t, head, hash_node) {
222 if (local == t->parms.iph.saddr &&
223 remote == t->parms.iph.daddr &&
224 link == t->parms.link &&
225 type == t->dev->type &&
226 ip_tunnel_key_match(&t->parms, flags, key))
232 static struct net_device *__ip_tunnel_create(struct net *net,
233 const struct rtnl_link_ops *ops,
234 struct ip_tunnel_parm *parms)
237 struct ip_tunnel *tunnel;
238 struct net_device *dev;
242 if (parms->name[0]) {
243 if (!dev_valid_name(parms->name))
245 strlcpy(name, parms->name, IFNAMSIZ);
247 if (strlen(ops->kind) > (IFNAMSIZ - 3))
249 strcpy(name, ops->kind);
254 dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup);
259 dev_net_set(dev, net);
261 dev->rtnl_link_ops = ops;
263 tunnel = netdev_priv(dev);
264 tunnel->parms = *parms;
267 err = register_netdevice(dev);
279 static int ip_tunnel_bind_dev(struct net_device *dev)
281 struct net_device *tdev = NULL;
282 struct ip_tunnel *tunnel = netdev_priv(dev);
283 const struct iphdr *iph;
284 int hlen = LL_MAX_HEADER;
285 int mtu = ETH_DATA_LEN;
286 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
288 iph = &tunnel->parms.iph;
290 /* Guess output device to choose reasonable mtu and needed_headroom */
295 ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr,
296 iph->saddr, tunnel->parms.o_key,
297 RT_TOS(iph->tos), tunnel->parms.link,
299 rt = ip_route_output_key(tunnel->net, &fl4);
305 if (dev->type != ARPHRD_ETHER)
306 dev->flags |= IFF_POINTOPOINT;
308 dst_cache_reset(&tunnel->dst_cache);
311 if (!tdev && tunnel->parms.link)
312 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
315 hlen = tdev->hard_header_len + tdev->needed_headroom;
316 mtu = min(tdev->mtu, IP_MAX_MTU);
319 dev->needed_headroom = t_hlen + hlen;
320 mtu -= (dev->hard_header_len + t_hlen);
322 if (mtu < IPV4_MIN_MTU)
328 static struct ip_tunnel *ip_tunnel_create(struct net *net,
329 struct ip_tunnel_net *itn,
330 struct ip_tunnel_parm *parms)
332 struct ip_tunnel *nt;
333 struct net_device *dev;
338 dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms);
340 return ERR_CAST(dev);
342 mtu = ip_tunnel_bind_dev(dev);
343 err = dev_set_mtu(dev, mtu);
345 goto err_dev_set_mtu;
347 nt = netdev_priv(dev);
348 t_hlen = nt->hlen + sizeof(struct iphdr);
349 dev->min_mtu = ETH_MIN_MTU;
350 dev->max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen;
351 ip_tunnel_add(itn, nt);
355 unregister_netdevice(dev);
359 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
360 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
363 const struct iphdr *iph = ip_hdr(skb);
366 #ifdef CONFIG_NET_IPGRE_BROADCAST
367 if (ipv4_is_multicast(iph->daddr)) {
368 tunnel->dev->stats.multicast++;
369 skb->pkt_type = PACKET_BROADCAST;
373 if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
374 ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
375 tunnel->dev->stats.rx_crc_errors++;
376 tunnel->dev->stats.rx_errors++;
380 if (tunnel->parms.i_flags&TUNNEL_SEQ) {
381 if (!(tpi->flags&TUNNEL_SEQ) ||
382 (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
383 tunnel->dev->stats.rx_fifo_errors++;
384 tunnel->dev->stats.rx_errors++;
387 tunnel->i_seqno = ntohl(tpi->seq) + 1;
390 skb_reset_network_header(skb);
392 err = IP_ECN_decapsulate(iph, skb);
395 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
396 &iph->saddr, iph->tos);
398 ++tunnel->dev->stats.rx_frame_errors;
399 ++tunnel->dev->stats.rx_errors;
404 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
405 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
407 if (tunnel->dev->type == ARPHRD_ETHER) {
408 skb->protocol = eth_type_trans(skb, tunnel->dev);
409 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
411 skb->dev = tunnel->dev;
415 skb_dst_set(skb, (struct dst_entry *)tun_dst);
417 gro_cells_receive(&tunnel->gro_cells, skb);
422 dst_release((struct dst_entry *)tun_dst);
426 EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
428 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops,
431 if (num >= MAX_IPTUN_ENCAP_OPS)
434 return !cmpxchg((const struct ip_tunnel_encap_ops **)
438 EXPORT_SYMBOL(ip_tunnel_encap_add_ops);
440 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops,
445 if (num >= MAX_IPTUN_ENCAP_OPS)
448 ret = (cmpxchg((const struct ip_tunnel_encap_ops **)
450 ops, NULL) == ops) ? 0 : -1;
456 EXPORT_SYMBOL(ip_tunnel_encap_del_ops);
458 int ip_tunnel_encap_setup(struct ip_tunnel *t,
459 struct ip_tunnel_encap *ipencap)
463 memset(&t->encap, 0, sizeof(t->encap));
465 hlen = ip_encap_hlen(ipencap);
469 t->encap.type = ipencap->type;
470 t->encap.sport = ipencap->sport;
471 t->encap.dport = ipencap->dport;
472 t->encap.flags = ipencap->flags;
474 t->encap_hlen = hlen;
475 t->hlen = t->encap_hlen + t->tun_hlen;
479 EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup);
481 static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
482 struct rtable *rt, __be16 df,
483 const struct iphdr *inner_iph,
484 int tunnel_hlen, __be32 dst, bool md)
486 struct ip_tunnel *tunnel = netdev_priv(dev);
490 tunnel_hlen = md ? tunnel_hlen : tunnel->hlen;
491 pkt_size = skb->len - tunnel_hlen - dev->hard_header_len;
494 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
495 - sizeof(struct iphdr) - tunnel_hlen;
497 mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
499 if (skb_valid_dst(skb))
500 skb_dst_update_pmtu_no_confirm(skb, mtu);
502 if (skb->protocol == htons(ETH_P_IP)) {
503 if (!skb_is_gso(skb) &&
504 (inner_iph->frag_off & htons(IP_DF)) &&
506 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
507 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
511 #if IS_ENABLED(CONFIG_IPV6)
512 else if (skb->protocol == htons(ETH_P_IPV6)) {
513 struct rt6_info *rt6;
516 rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) :
518 daddr = md ? dst : tunnel->parms.iph.daddr;
520 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
521 mtu >= IPV6_MIN_MTU) {
522 if ((daddr && !ipv4_is_multicast(daddr)) ||
523 rt6->rt6i_dst.plen == 128) {
524 rt6->rt6i_flags |= RTF_MODIFIED;
525 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
529 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
531 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
539 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
540 u8 proto, int tunnel_hlen)
542 struct ip_tunnel *tunnel = netdev_priv(dev);
543 u32 headroom = sizeof(struct iphdr);
544 struct ip_tunnel_info *tun_info;
545 const struct ip_tunnel_key *key;
546 const struct iphdr *inner_iph;
547 struct rtable *rt = NULL;
553 tun_info = skb_tunnel_info(skb);
554 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
555 ip_tunnel_info_af(tun_info) != AF_INET))
557 key = &tun_info->key;
558 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
559 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
562 if (skb->protocol == htons(ETH_P_IP))
563 tos = inner_iph->tos;
564 else if (skb->protocol == htons(ETH_P_IPV6))
565 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
567 ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
568 tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
569 0, skb->mark, skb_get_hash(skb));
570 if (tunnel->encap.type != TUNNEL_ENCAP_NONE)
573 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
575 rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr);
577 rt = ip_route_output_key(tunnel->net, &fl4);
579 dev->stats.tx_carrier_errors++;
583 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
586 if (rt->dst.dev == dev) {
588 dev->stats.collisions++;
592 if (key->tun_flags & TUNNEL_DONT_FRAGMENT)
594 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen,
595 key->u.ipv4.dst, true)) {
600 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
603 if (skb->protocol == htons(ETH_P_IP))
604 ttl = inner_iph->ttl;
605 else if (skb->protocol == htons(ETH_P_IPV6))
606 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
608 ttl = ip4_dst_hoplimit(&rt->dst);
611 headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len;
612 if (headroom > dev->needed_headroom)
613 dev->needed_headroom = headroom;
615 if (skb_cow_head(skb, dev->needed_headroom)) {
619 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl,
620 df, !net_eq(tunnel->net, dev_net(dev)));
623 dev->stats.tx_errors++;
626 dev->stats.tx_dropped++;
630 EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit);
632 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
633 const struct iphdr *tnl_params, u8 protocol)
635 struct ip_tunnel *tunnel = netdev_priv(dev);
636 struct ip_tunnel_info *tun_info = NULL;
637 const struct iphdr *inner_iph;
638 unsigned int max_headroom; /* The extra header space needed */
639 struct rtable *rt = NULL; /* Route to the other host */
640 bool use_cache = false;
648 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
649 connected = (tunnel->parms.iph.daddr != 0);
651 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
653 dst = tnl_params->daddr;
658 dev->stats.tx_fifo_errors++;
662 tun_info = skb_tunnel_info(skb);
663 if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) &&
664 ip_tunnel_info_af(tun_info) == AF_INET &&
665 tun_info->key.u.ipv4.dst) {
666 dst = tun_info->key.u.ipv4.dst;
670 else if (skb->protocol == htons(ETH_P_IP)) {
671 rt = skb_rtable(skb);
672 dst = rt_nexthop(rt, inner_iph->daddr);
674 #if IS_ENABLED(CONFIG_IPV6)
675 else if (skb->protocol == htons(ETH_P_IPV6)) {
676 const struct in6_addr *addr6;
677 struct neighbour *neigh;
678 bool do_tx_error_icmp;
681 neigh = dst_neigh_lookup(skb_dst(skb),
682 &ipv6_hdr(skb)->daddr);
686 addr6 = (const struct in6_addr *)&neigh->primary_key;
687 addr_type = ipv6_addr_type(addr6);
689 if (addr_type == IPV6_ADDR_ANY) {
690 addr6 = &ipv6_hdr(skb)->daddr;
691 addr_type = ipv6_addr_type(addr6);
694 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
695 do_tx_error_icmp = true;
697 do_tx_error_icmp = false;
698 dst = addr6->s6_addr32[3];
700 neigh_release(neigh);
701 if (do_tx_error_icmp)
712 tos = tnl_params->tos;
715 if (skb->protocol == htons(ETH_P_IP)) {
716 tos = inner_iph->tos;
718 } else if (skb->protocol == htons(ETH_P_IPV6)) {
719 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
724 ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr,
725 tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link,
726 tunnel->fwmark, skb_get_hash(skb));
728 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0)
731 if (connected && md) {
732 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
734 rt = dst_cache_get_ip4(&tun_info->dst_cache,
737 rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache,
742 rt = ip_route_output_key(tunnel->net, &fl4);
745 dev->stats.tx_carrier_errors++;
749 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
751 else if (!md && connected)
752 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst,
756 if (rt->dst.dev == dev) {
758 dev->stats.collisions++;
762 if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph,
768 if (tunnel->err_count > 0) {
769 if (time_before(jiffies,
770 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
773 dst_link_failure(skb);
775 tunnel->err_count = 0;
778 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
779 ttl = tnl_params->ttl;
781 if (skb->protocol == htons(ETH_P_IP))
782 ttl = inner_iph->ttl;
783 #if IS_ENABLED(CONFIG_IPV6)
784 else if (skb->protocol == htons(ETH_P_IPV6))
785 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
788 ttl = ip4_dst_hoplimit(&rt->dst);
791 df = tnl_params->frag_off;
792 if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df)
793 df |= (inner_iph->frag_off&htons(IP_DF));
795 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
796 + rt->dst.header_len + ip_encap_hlen(&tunnel->encap);
797 if (max_headroom > dev->needed_headroom)
798 dev->needed_headroom = max_headroom;
800 if (skb_cow_head(skb, dev->needed_headroom)) {
802 dev->stats.tx_dropped++;
807 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
808 df, !net_eq(tunnel->net, dev_net(dev)));
811 #if IS_ENABLED(CONFIG_IPV6)
813 dst_link_failure(skb);
816 dev->stats.tx_errors++;
819 EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
821 static void ip_tunnel_update(struct ip_tunnel_net *itn,
823 struct net_device *dev,
824 struct ip_tunnel_parm *p,
828 ip_tunnel_del(itn, t);
829 t->parms.iph.saddr = p->iph.saddr;
830 t->parms.iph.daddr = p->iph.daddr;
831 t->parms.i_key = p->i_key;
832 t->parms.o_key = p->o_key;
833 if (dev->type != ARPHRD_ETHER) {
834 memcpy(dev->dev_addr, &p->iph.saddr, 4);
835 memcpy(dev->broadcast, &p->iph.daddr, 4);
837 ip_tunnel_add(itn, t);
839 t->parms.iph.ttl = p->iph.ttl;
840 t->parms.iph.tos = p->iph.tos;
841 t->parms.iph.frag_off = p->iph.frag_off;
843 if (t->parms.link != p->link || t->fwmark != fwmark) {
846 t->parms.link = p->link;
848 mtu = ip_tunnel_bind_dev(dev);
852 dst_cache_reset(&t->dst_cache);
853 netdev_state_change(dev);
856 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
859 struct ip_tunnel *t = netdev_priv(dev);
860 struct net *net = t->net;
861 struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id);
865 if (dev == itn->fb_tunnel_dev) {
866 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
868 t = netdev_priv(dev);
870 memcpy(p, &t->parms, sizeof(*p));
876 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
879 p->iph.frag_off |= htons(IP_DF);
880 if (!(p->i_flags & VTI_ISVTI)) {
881 if (!(p->i_flags & TUNNEL_KEY))
883 if (!(p->o_flags & TUNNEL_KEY))
887 t = ip_tunnel_find(itn, p, itn->type);
889 if (cmd == SIOCADDTUNNEL) {
891 t = ip_tunnel_create(net, itn, p);
892 err = PTR_ERR_OR_ZERO(t);
899 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
906 unsigned int nflags = 0;
908 if (ipv4_is_multicast(p->iph.daddr))
909 nflags = IFF_BROADCAST;
910 else if (p->iph.daddr)
911 nflags = IFF_POINTOPOINT;
913 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
918 t = netdev_priv(dev);
924 ip_tunnel_update(itn, t, dev, p, true, 0);
932 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
935 if (dev == itn->fb_tunnel_dev) {
937 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
941 if (t == netdev_priv(itn->fb_tunnel_dev))
945 unregister_netdevice(dev);
956 EXPORT_SYMBOL_GPL(ip_tunnel_ctl);
958 int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
960 struct ip_tunnel_parm p;
963 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
965 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd);
966 if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
970 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
972 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
974 struct ip_tunnel *tunnel = netdev_priv(dev);
975 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
976 int max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen;
978 if (new_mtu < ETH_MIN_MTU)
981 if (new_mtu > max_mtu) {
991 EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu);
993 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
995 return __ip_tunnel_change_mtu(dev, new_mtu, true);
997 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
999 static void ip_tunnel_dev_free(struct net_device *dev)
1001 struct ip_tunnel *tunnel = netdev_priv(dev);
1003 gro_cells_destroy(&tunnel->gro_cells);
1004 dst_cache_destroy(&tunnel->dst_cache);
1005 free_percpu(dev->tstats);
1008 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
1010 struct ip_tunnel *tunnel = netdev_priv(dev);
1011 struct ip_tunnel_net *itn;
1013 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
1015 if (itn->fb_tunnel_dev != dev) {
1016 ip_tunnel_del(itn, netdev_priv(dev));
1017 unregister_netdevice_queue(dev, head);
1020 EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
1022 struct net *ip_tunnel_get_link_net(const struct net_device *dev)
1024 struct ip_tunnel *tunnel = netdev_priv(dev);
1028 EXPORT_SYMBOL(ip_tunnel_get_link_net);
1030 int ip_tunnel_get_iflink(const struct net_device *dev)
1032 struct ip_tunnel *tunnel = netdev_priv(dev);
1034 return tunnel->parms.link;
1036 EXPORT_SYMBOL(ip_tunnel_get_iflink);
1038 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
1039 struct rtnl_link_ops *ops, char *devname)
1041 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
1042 struct ip_tunnel_parm parms;
1045 itn->rtnl_link_ops = ops;
1046 for (i = 0; i < IP_TNL_HASH_SIZE; i++)
1047 INIT_HLIST_HEAD(&itn->tunnels[i]);
1049 if (!ops || !net_has_fallback_tunnels(net)) {
1050 struct ip_tunnel_net *it_init_net;
1052 it_init_net = net_generic(&init_net, ip_tnl_net_id);
1053 itn->type = it_init_net->type;
1054 itn->fb_tunnel_dev = NULL;
1058 memset(&parms, 0, sizeof(parms));
1060 strlcpy(parms.name, devname, IFNAMSIZ);
1063 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
1064 /* FB netdevice is special: we have one, and only one per netns.
1065 * Allowing to move it to another netns is clearly unsafe.
1067 if (!IS_ERR(itn->fb_tunnel_dev)) {
1068 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1069 itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);
1070 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev));
1071 itn->type = itn->fb_tunnel_dev->type;
1075 return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev);
1077 EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
1079 static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn,
1080 struct list_head *head,
1081 struct rtnl_link_ops *ops)
1083 struct net_device *dev, *aux;
1086 for_each_netdev_safe(net, dev, aux)
1087 if (dev->rtnl_link_ops == ops)
1088 unregister_netdevice_queue(dev, head);
1090 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
1091 struct ip_tunnel *t;
1092 struct hlist_node *n;
1093 struct hlist_head *thead = &itn->tunnels[h];
1095 hlist_for_each_entry_safe(t, n, thead, hash_node)
1096 /* If dev is in the same netns, it has already
1097 * been added to the list by the previous loop.
1099 if (!net_eq(dev_net(t->dev), net))
1100 unregister_netdevice_queue(t->dev, head);
1104 void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id,
1105 struct rtnl_link_ops *ops)
1107 struct ip_tunnel_net *itn;
1112 list_for_each_entry(net, net_list, exit_list) {
1113 itn = net_generic(net, id);
1114 ip_tunnel_destroy(net, itn, &list, ops);
1116 unregister_netdevice_many(&list);
1119 EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets);
1121 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
1122 struct ip_tunnel_parm *p, __u32 fwmark)
1124 struct ip_tunnel *nt;
1125 struct net *net = dev_net(dev);
1126 struct ip_tunnel_net *itn;
1130 nt = netdev_priv(dev);
1131 itn = net_generic(net, nt->ip_tnl_net_id);
1133 if (nt->collect_md) {
1134 if (rtnl_dereference(itn->collect_md_tun))
1137 if (ip_tunnel_find(itn, p, dev->type))
1143 nt->fwmark = fwmark;
1144 err = register_netdevice(dev);
1146 goto err_register_netdevice;
1148 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1149 eth_hw_addr_random(dev);
1151 mtu = ip_tunnel_bind_dev(dev);
1153 unsigned int max = IP_MAX_MTU - dev->hard_header_len - nt->hlen;
1155 mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU,
1156 (unsigned int)(max - sizeof(struct iphdr)));
1159 err = dev_set_mtu(dev, mtu);
1161 goto err_dev_set_mtu;
1163 ip_tunnel_add(itn, nt);
1167 unregister_netdevice(dev);
1168 err_register_netdevice:
1171 EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
1173 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
1174 struct ip_tunnel_parm *p, __u32 fwmark)
1176 struct ip_tunnel *t;
1177 struct ip_tunnel *tunnel = netdev_priv(dev);
1178 struct net *net = tunnel->net;
1179 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
1181 if (dev == itn->fb_tunnel_dev)
1184 t = ip_tunnel_find(itn, p, dev->type);
1192 if (dev->type != ARPHRD_ETHER) {
1193 unsigned int nflags = 0;
1195 if (ipv4_is_multicast(p->iph.daddr))
1196 nflags = IFF_BROADCAST;
1197 else if (p->iph.daddr)
1198 nflags = IFF_POINTOPOINT;
1200 if ((dev->flags ^ nflags) &
1201 (IFF_POINTOPOINT | IFF_BROADCAST))
1206 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark);
1209 EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
1211 int ip_tunnel_init(struct net_device *dev)
1213 struct ip_tunnel *tunnel = netdev_priv(dev);
1214 struct iphdr *iph = &tunnel->parms.iph;
1217 dev->needs_free_netdev = true;
1218 dev->priv_destructor = ip_tunnel_dev_free;
1219 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1223 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1225 free_percpu(dev->tstats);
1229 err = gro_cells_init(&tunnel->gro_cells, dev);
1231 dst_cache_destroy(&tunnel->dst_cache);
1232 free_percpu(dev->tstats);
1237 tunnel->net = dev_net(dev);
1238 strcpy(tunnel->parms.name, dev->name);
1242 if (tunnel->collect_md)
1243 netif_keep_dst(dev);
1246 EXPORT_SYMBOL_GPL(ip_tunnel_init);
1248 void ip_tunnel_uninit(struct net_device *dev)
1250 struct ip_tunnel *tunnel = netdev_priv(dev);
1251 struct net *net = tunnel->net;
1252 struct ip_tunnel_net *itn;
1254 itn = net_generic(net, tunnel->ip_tnl_net_id);
1255 ip_tunnel_del(itn, netdev_priv(dev));
1256 if (itn->fb_tunnel_dev == dev)
1257 WRITE_ONCE(itn->fb_tunnel_dev, NULL);
1259 dst_cache_reset(&tunnel->dst_cache);
1261 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1263 /* Do least required initialization, rest of init is done in tunnel_init call */
1264 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id)
1266 struct ip_tunnel *tunnel = netdev_priv(dev);
1267 tunnel->ip_tnl_net_id = net_id;
1269 EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1271 MODULE_LICENSE("GPL");