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 struct pcpu_sw_netstats *tstats;
364 const struct iphdr *iph = ip_hdr(skb);
367 #ifdef CONFIG_NET_IPGRE_BROADCAST
368 if (ipv4_is_multicast(iph->daddr)) {
369 tunnel->dev->stats.multicast++;
370 skb->pkt_type = PACKET_BROADCAST;
374 if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
375 ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
376 tunnel->dev->stats.rx_crc_errors++;
377 tunnel->dev->stats.rx_errors++;
381 if (tunnel->parms.i_flags&TUNNEL_SEQ) {
382 if (!(tpi->flags&TUNNEL_SEQ) ||
383 (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
384 tunnel->dev->stats.rx_fifo_errors++;
385 tunnel->dev->stats.rx_errors++;
388 tunnel->i_seqno = ntohl(tpi->seq) + 1;
391 skb_reset_network_header(skb);
393 err = IP_ECN_decapsulate(iph, skb);
396 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
397 &iph->saddr, iph->tos);
399 ++tunnel->dev->stats.rx_frame_errors;
400 ++tunnel->dev->stats.rx_errors;
405 tstats = this_cpu_ptr(tunnel->dev->tstats);
406 u64_stats_update_begin(&tstats->syncp);
407 tstats->rx_packets++;
408 tstats->rx_bytes += skb->len;
409 u64_stats_update_end(&tstats->syncp);
411 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
413 if (tunnel->dev->type == ARPHRD_ETHER) {
414 skb->protocol = eth_type_trans(skb, tunnel->dev);
415 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
417 skb->dev = tunnel->dev;
421 skb_dst_set(skb, (struct dst_entry *)tun_dst);
423 gro_cells_receive(&tunnel->gro_cells, skb);
428 dst_release((struct dst_entry *)tun_dst);
432 EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
434 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops,
437 if (num >= MAX_IPTUN_ENCAP_OPS)
440 return !cmpxchg((const struct ip_tunnel_encap_ops **)
444 EXPORT_SYMBOL(ip_tunnel_encap_add_ops);
446 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops,
451 if (num >= MAX_IPTUN_ENCAP_OPS)
454 ret = (cmpxchg((const struct ip_tunnel_encap_ops **)
456 ops, NULL) == ops) ? 0 : -1;
462 EXPORT_SYMBOL(ip_tunnel_encap_del_ops);
464 int ip_tunnel_encap_setup(struct ip_tunnel *t,
465 struct ip_tunnel_encap *ipencap)
469 memset(&t->encap, 0, sizeof(t->encap));
471 hlen = ip_encap_hlen(ipencap);
475 t->encap.type = ipencap->type;
476 t->encap.sport = ipencap->sport;
477 t->encap.dport = ipencap->dport;
478 t->encap.flags = ipencap->flags;
480 t->encap_hlen = hlen;
481 t->hlen = t->encap_hlen + t->tun_hlen;
485 EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup);
487 static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
488 struct rtable *rt, __be16 df,
489 const struct iphdr *inner_iph,
490 int tunnel_hlen, __be32 dst, bool md)
492 struct ip_tunnel *tunnel = netdev_priv(dev);
496 tunnel_hlen = md ? tunnel_hlen : tunnel->hlen;
497 pkt_size = skb->len - tunnel_hlen - dev->hard_header_len;
500 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
501 - sizeof(struct iphdr) - tunnel_hlen;
503 mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
505 if (skb_valid_dst(skb))
506 skb_dst_update_pmtu_no_confirm(skb, mtu);
508 if (skb->protocol == htons(ETH_P_IP)) {
509 if (!skb_is_gso(skb) &&
510 (inner_iph->frag_off & htons(IP_DF)) &&
512 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
513 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
517 #if IS_ENABLED(CONFIG_IPV6)
518 else if (skb->protocol == htons(ETH_P_IPV6)) {
519 struct rt6_info *rt6;
522 rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) :
524 daddr = md ? dst : tunnel->parms.iph.daddr;
526 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
527 mtu >= IPV6_MIN_MTU) {
528 if ((daddr && !ipv4_is_multicast(daddr)) ||
529 rt6->rt6i_dst.plen == 128) {
530 rt6->rt6i_flags |= RTF_MODIFIED;
531 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
535 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
537 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
545 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
546 u8 proto, int tunnel_hlen)
548 struct ip_tunnel *tunnel = netdev_priv(dev);
549 u32 headroom = sizeof(struct iphdr);
550 struct ip_tunnel_info *tun_info;
551 const struct ip_tunnel_key *key;
552 const struct iphdr *inner_iph;
553 struct rtable *rt = NULL;
559 tun_info = skb_tunnel_info(skb);
560 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
561 ip_tunnel_info_af(tun_info) != AF_INET))
563 key = &tun_info->key;
564 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
565 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
568 if (skb->protocol == htons(ETH_P_IP))
569 tos = inner_iph->tos;
570 else if (skb->protocol == htons(ETH_P_IPV6))
571 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
573 ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
574 tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
575 0, skb->mark, skb_get_hash(skb));
576 if (tunnel->encap.type != TUNNEL_ENCAP_NONE)
579 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
581 rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr);
583 rt = ip_route_output_key(tunnel->net, &fl4);
585 dev->stats.tx_carrier_errors++;
589 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
592 if (rt->dst.dev == dev) {
594 dev->stats.collisions++;
598 if (key->tun_flags & TUNNEL_DONT_FRAGMENT)
600 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen,
601 key->u.ipv4.dst, true)) {
606 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
609 if (skb->protocol == htons(ETH_P_IP))
610 ttl = inner_iph->ttl;
611 else if (skb->protocol == htons(ETH_P_IPV6))
612 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
614 ttl = ip4_dst_hoplimit(&rt->dst);
617 if (!df && skb->protocol == htons(ETH_P_IP))
618 df = inner_iph->frag_off & htons(IP_DF);
620 headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len;
621 if (headroom > dev->needed_headroom)
622 dev->needed_headroom = headroom;
624 if (skb_cow_head(skb, dev->needed_headroom)) {
628 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl,
629 df, !net_eq(tunnel->net, dev_net(dev)));
632 dev->stats.tx_errors++;
635 dev->stats.tx_dropped++;
639 EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit);
641 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
642 const struct iphdr *tnl_params, u8 protocol)
644 struct ip_tunnel *tunnel = netdev_priv(dev);
645 struct ip_tunnel_info *tun_info = NULL;
646 const struct iphdr *inner_iph;
647 unsigned int max_headroom; /* The extra header space needed */
648 struct rtable *rt = NULL; /* Route to the other host */
649 bool use_cache = false;
657 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
658 connected = (tunnel->parms.iph.daddr != 0);
660 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
662 dst = tnl_params->daddr;
667 dev->stats.tx_fifo_errors++;
671 tun_info = skb_tunnel_info(skb);
672 if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) &&
673 ip_tunnel_info_af(tun_info) == AF_INET &&
674 tun_info->key.u.ipv4.dst) {
675 dst = tun_info->key.u.ipv4.dst;
679 else if (skb->protocol == htons(ETH_P_IP)) {
680 rt = skb_rtable(skb);
681 dst = rt_nexthop(rt, inner_iph->daddr);
683 #if IS_ENABLED(CONFIG_IPV6)
684 else if (skb->protocol == htons(ETH_P_IPV6)) {
685 const struct in6_addr *addr6;
686 struct neighbour *neigh;
687 bool do_tx_error_icmp;
690 neigh = dst_neigh_lookup(skb_dst(skb),
691 &ipv6_hdr(skb)->daddr);
695 addr6 = (const struct in6_addr *)&neigh->primary_key;
696 addr_type = ipv6_addr_type(addr6);
698 if (addr_type == IPV6_ADDR_ANY) {
699 addr6 = &ipv6_hdr(skb)->daddr;
700 addr_type = ipv6_addr_type(addr6);
703 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
704 do_tx_error_icmp = true;
706 do_tx_error_icmp = false;
707 dst = addr6->s6_addr32[3];
709 neigh_release(neigh);
710 if (do_tx_error_icmp)
721 tos = tnl_params->tos;
724 if (skb->protocol == htons(ETH_P_IP)) {
725 tos = inner_iph->tos;
727 } else if (skb->protocol == htons(ETH_P_IPV6)) {
728 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
733 ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr,
734 tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link,
735 tunnel->fwmark, skb_get_hash(skb));
737 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0)
740 if (connected && md) {
741 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
743 rt = dst_cache_get_ip4(&tun_info->dst_cache,
746 rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache,
751 rt = ip_route_output_key(tunnel->net, &fl4);
754 dev->stats.tx_carrier_errors++;
758 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
760 else if (!md && connected)
761 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst,
765 if (rt->dst.dev == dev) {
767 dev->stats.collisions++;
771 if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph,
777 if (tunnel->err_count > 0) {
778 if (time_before(jiffies,
779 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
782 dst_link_failure(skb);
784 tunnel->err_count = 0;
787 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
788 ttl = tnl_params->ttl;
790 if (skb->protocol == htons(ETH_P_IP))
791 ttl = inner_iph->ttl;
792 #if IS_ENABLED(CONFIG_IPV6)
793 else if (skb->protocol == htons(ETH_P_IPV6))
794 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
797 ttl = ip4_dst_hoplimit(&rt->dst);
800 df = tnl_params->frag_off;
801 if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df)
802 df |= (inner_iph->frag_off&htons(IP_DF));
804 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
805 + rt->dst.header_len + ip_encap_hlen(&tunnel->encap);
806 if (max_headroom > dev->needed_headroom)
807 dev->needed_headroom = max_headroom;
809 if (skb_cow_head(skb, dev->needed_headroom)) {
811 dev->stats.tx_dropped++;
816 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
817 df, !net_eq(tunnel->net, dev_net(dev)));
820 #if IS_ENABLED(CONFIG_IPV6)
822 dst_link_failure(skb);
825 dev->stats.tx_errors++;
828 EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
830 static void ip_tunnel_update(struct ip_tunnel_net *itn,
832 struct net_device *dev,
833 struct ip_tunnel_parm *p,
837 ip_tunnel_del(itn, t);
838 t->parms.iph.saddr = p->iph.saddr;
839 t->parms.iph.daddr = p->iph.daddr;
840 t->parms.i_key = p->i_key;
841 t->parms.o_key = p->o_key;
842 if (dev->type != ARPHRD_ETHER) {
843 memcpy(dev->dev_addr, &p->iph.saddr, 4);
844 memcpy(dev->broadcast, &p->iph.daddr, 4);
846 ip_tunnel_add(itn, t);
848 t->parms.iph.ttl = p->iph.ttl;
849 t->parms.iph.tos = p->iph.tos;
850 t->parms.iph.frag_off = p->iph.frag_off;
852 if (t->parms.link != p->link || t->fwmark != fwmark) {
855 t->parms.link = p->link;
857 mtu = ip_tunnel_bind_dev(dev);
861 dst_cache_reset(&t->dst_cache);
862 netdev_state_change(dev);
865 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
868 struct ip_tunnel *t = netdev_priv(dev);
869 struct net *net = t->net;
870 struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id);
874 if (dev == itn->fb_tunnel_dev) {
875 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
877 t = netdev_priv(dev);
879 memcpy(p, &t->parms, sizeof(*p));
885 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
888 p->iph.frag_off |= htons(IP_DF);
889 if (!(p->i_flags & VTI_ISVTI)) {
890 if (!(p->i_flags & TUNNEL_KEY))
892 if (!(p->o_flags & TUNNEL_KEY))
896 t = ip_tunnel_find(itn, p, itn->type);
898 if (cmd == SIOCADDTUNNEL) {
900 t = ip_tunnel_create(net, itn, p);
901 err = PTR_ERR_OR_ZERO(t);
908 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
915 unsigned int nflags = 0;
917 if (ipv4_is_multicast(p->iph.daddr))
918 nflags = IFF_BROADCAST;
919 else if (p->iph.daddr)
920 nflags = IFF_POINTOPOINT;
922 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
927 t = netdev_priv(dev);
933 ip_tunnel_update(itn, t, dev, p, true, 0);
941 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
944 if (dev == itn->fb_tunnel_dev) {
946 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
950 if (t == netdev_priv(itn->fb_tunnel_dev))
954 unregister_netdevice(dev);
965 EXPORT_SYMBOL_GPL(ip_tunnel_ctl);
967 int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
969 struct ip_tunnel_parm p;
972 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
974 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd);
975 if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
979 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
981 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
983 struct ip_tunnel *tunnel = netdev_priv(dev);
984 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
985 int max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen;
987 if (new_mtu < ETH_MIN_MTU)
990 if (new_mtu > max_mtu) {
1000 EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu);
1002 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1004 return __ip_tunnel_change_mtu(dev, new_mtu, true);
1006 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
1008 static void ip_tunnel_dev_free(struct net_device *dev)
1010 struct ip_tunnel *tunnel = netdev_priv(dev);
1012 gro_cells_destroy(&tunnel->gro_cells);
1013 dst_cache_destroy(&tunnel->dst_cache);
1014 free_percpu(dev->tstats);
1017 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
1019 struct ip_tunnel *tunnel = netdev_priv(dev);
1020 struct ip_tunnel_net *itn;
1022 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
1024 if (itn->fb_tunnel_dev != dev) {
1025 ip_tunnel_del(itn, netdev_priv(dev));
1026 unregister_netdevice_queue(dev, head);
1029 EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
1031 struct net *ip_tunnel_get_link_net(const struct net_device *dev)
1033 struct ip_tunnel *tunnel = netdev_priv(dev);
1037 EXPORT_SYMBOL(ip_tunnel_get_link_net);
1039 int ip_tunnel_get_iflink(const struct net_device *dev)
1041 struct ip_tunnel *tunnel = netdev_priv(dev);
1043 return tunnel->parms.link;
1045 EXPORT_SYMBOL(ip_tunnel_get_iflink);
1047 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
1048 struct rtnl_link_ops *ops, char *devname)
1050 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
1051 struct ip_tunnel_parm parms;
1054 itn->rtnl_link_ops = ops;
1055 for (i = 0; i < IP_TNL_HASH_SIZE; i++)
1056 INIT_HLIST_HEAD(&itn->tunnels[i]);
1058 if (!ops || !net_has_fallback_tunnels(net)) {
1059 struct ip_tunnel_net *it_init_net;
1061 it_init_net = net_generic(&init_net, ip_tnl_net_id);
1062 itn->type = it_init_net->type;
1063 itn->fb_tunnel_dev = NULL;
1067 memset(&parms, 0, sizeof(parms));
1069 strlcpy(parms.name, devname, IFNAMSIZ);
1072 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
1073 /* FB netdevice is special: we have one, and only one per netns.
1074 * Allowing to move it to another netns is clearly unsafe.
1076 if (!IS_ERR(itn->fb_tunnel_dev)) {
1077 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1078 itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);
1079 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev));
1080 itn->type = itn->fb_tunnel_dev->type;
1084 return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev);
1086 EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
1088 static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn,
1089 struct list_head *head,
1090 struct rtnl_link_ops *ops)
1092 struct net_device *dev, *aux;
1095 for_each_netdev_safe(net, dev, aux)
1096 if (dev->rtnl_link_ops == ops)
1097 unregister_netdevice_queue(dev, head);
1099 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
1100 struct ip_tunnel *t;
1101 struct hlist_node *n;
1102 struct hlist_head *thead = &itn->tunnels[h];
1104 hlist_for_each_entry_safe(t, n, thead, hash_node)
1105 /* If dev is in the same netns, it has already
1106 * been added to the list by the previous loop.
1108 if (!net_eq(dev_net(t->dev), net))
1109 unregister_netdevice_queue(t->dev, head);
1113 void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id,
1114 struct rtnl_link_ops *ops)
1116 struct ip_tunnel_net *itn;
1121 list_for_each_entry(net, net_list, exit_list) {
1122 itn = net_generic(net, id);
1123 ip_tunnel_destroy(net, itn, &list, ops);
1125 unregister_netdevice_many(&list);
1128 EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets);
1130 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
1131 struct ip_tunnel_parm *p, __u32 fwmark)
1133 struct ip_tunnel *nt;
1134 struct net *net = dev_net(dev);
1135 struct ip_tunnel_net *itn;
1139 nt = netdev_priv(dev);
1140 itn = net_generic(net, nt->ip_tnl_net_id);
1142 if (nt->collect_md) {
1143 if (rtnl_dereference(itn->collect_md_tun))
1146 if (ip_tunnel_find(itn, p, dev->type))
1152 nt->fwmark = fwmark;
1153 err = register_netdevice(dev);
1155 goto err_register_netdevice;
1157 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1158 eth_hw_addr_random(dev);
1160 mtu = ip_tunnel_bind_dev(dev);
1162 unsigned int max = IP_MAX_MTU - dev->hard_header_len - nt->hlen;
1164 mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU,
1165 (unsigned int)(max - sizeof(struct iphdr)));
1168 err = dev_set_mtu(dev, mtu);
1170 goto err_dev_set_mtu;
1172 ip_tunnel_add(itn, nt);
1176 unregister_netdevice(dev);
1177 err_register_netdevice:
1180 EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
1182 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
1183 struct ip_tunnel_parm *p, __u32 fwmark)
1185 struct ip_tunnel *t;
1186 struct ip_tunnel *tunnel = netdev_priv(dev);
1187 struct net *net = tunnel->net;
1188 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
1190 if (dev == itn->fb_tunnel_dev)
1193 t = ip_tunnel_find(itn, p, dev->type);
1201 if (dev->type != ARPHRD_ETHER) {
1202 unsigned int nflags = 0;
1204 if (ipv4_is_multicast(p->iph.daddr))
1205 nflags = IFF_BROADCAST;
1206 else if (p->iph.daddr)
1207 nflags = IFF_POINTOPOINT;
1209 if ((dev->flags ^ nflags) &
1210 (IFF_POINTOPOINT | IFF_BROADCAST))
1215 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark);
1218 EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
1220 int ip_tunnel_init(struct net_device *dev)
1222 struct ip_tunnel *tunnel = netdev_priv(dev);
1223 struct iphdr *iph = &tunnel->parms.iph;
1226 dev->needs_free_netdev = true;
1227 dev->priv_destructor = ip_tunnel_dev_free;
1228 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1232 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1234 free_percpu(dev->tstats);
1238 err = gro_cells_init(&tunnel->gro_cells, dev);
1240 dst_cache_destroy(&tunnel->dst_cache);
1241 free_percpu(dev->tstats);
1246 tunnel->net = dev_net(dev);
1247 strcpy(tunnel->parms.name, dev->name);
1251 if (tunnel->collect_md)
1252 netif_keep_dst(dev);
1255 EXPORT_SYMBOL_GPL(ip_tunnel_init);
1257 void ip_tunnel_uninit(struct net_device *dev)
1259 struct ip_tunnel *tunnel = netdev_priv(dev);
1260 struct net *net = tunnel->net;
1261 struct ip_tunnel_net *itn;
1263 itn = net_generic(net, tunnel->ip_tnl_net_id);
1264 ip_tunnel_del(itn, netdev_priv(dev));
1265 if (itn->fb_tunnel_dev == dev)
1266 WRITE_ONCE(itn->fb_tunnel_dev, NULL);
1268 dst_cache_reset(&tunnel->dst_cache);
1270 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1272 /* Do least required initialization, rest of init is done in tunnel_init call */
1273 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id)
1275 struct ip_tunnel *tunnel = netdev_priv(dev);
1276 tunnel->ip_tnl_net_id = net_id;
1278 EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1280 MODULE_LICENSE("GPL");