1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
11 * Roger Venning <r.venning@telstra.com>: 6to4 support
12 * Nate Thompson <nate@thebog.net>: 6to4 support
13 * Fred Templin <fred.l.templin@boeing.com>: isatap support
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/in6.h>
26 #include <linux/netdevice.h>
27 #include <linux/if_arp.h>
28 #include <linux/icmp.h>
29 #include <linux/slab.h>
30 #include <linux/uaccess.h>
31 #include <linux/init.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/if_ether.h>
39 #include <net/protocol.h>
40 #include <net/transp_v6.h>
41 #include <net/ip6_fib.h>
42 #include <net/ip6_route.h>
43 #include <net/ndisc.h>
44 #include <net/addrconf.h>
48 #include <net/ip_tunnels.h>
49 #include <net/inet_ecn.h>
51 #include <net/dsfield.h>
52 #include <net/net_namespace.h>
53 #include <net/netns/generic.h>
56 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
58 For comments look at net/ipv4/ip_gre.c --ANK
61 #define IP6_SIT_HASH_SIZE 16
62 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
64 static bool log_ecn_error = true;
65 module_param(log_ecn_error, bool, 0644);
66 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
68 static int ipip6_tunnel_init(struct net_device *dev);
69 static void ipip6_tunnel_setup(struct net_device *dev);
70 static void ipip6_dev_free(struct net_device *dev);
71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
73 static struct rtnl_link_ops sit_link_ops __read_mostly;
75 static unsigned int sit_net_id __read_mostly;
77 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
78 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
79 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];
80 struct ip_tunnel __rcu *tunnels_wc[1];
81 struct ip_tunnel __rcu **tunnels[4];
83 struct net_device *fb_tunnel_dev;
86 static inline struct sit_net *dev_to_sit_net(struct net_device *dev)
88 struct ip_tunnel *t = netdev_priv(dev);
90 return net_generic(t->net, sit_net_id);
94 * Must be invoked with rcu_read_lock
96 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
97 struct net_device *dev,
98 __be32 remote, __be32 local,
101 unsigned int h0 = HASH(remote);
102 unsigned int h1 = HASH(local);
104 struct sit_net *sitn = net_generic(net, sit_net_id);
105 int ifindex = dev ? dev->ifindex : 0;
107 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
108 if (local == t->parms.iph.saddr &&
109 remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || ifindex == t->parms.link ||
111 sifindex == t->parms.link) &&
112 (t->dev->flags & IFF_UP))
115 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
116 if (remote == t->parms.iph.daddr &&
117 (!dev || !t->parms.link || ifindex == t->parms.link ||
118 sifindex == t->parms.link) &&
119 (t->dev->flags & IFF_UP))
122 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
123 if (local == t->parms.iph.saddr &&
124 (!dev || !t->parms.link || ifindex == t->parms.link ||
125 sifindex == t->parms.link) &&
126 (t->dev->flags & IFF_UP))
129 t = rcu_dereference(sitn->tunnels_wc[0]);
130 if (t && (t->dev->flags & IFF_UP))
135 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
136 struct ip_tunnel_parm *parms)
138 __be32 remote = parms->iph.daddr;
139 __be32 local = parms->iph.saddr;
151 return &sitn->tunnels[prio][h];
154 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
157 return __ipip6_bucket(sitn, &t->parms);
160 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
162 struct ip_tunnel __rcu **tp;
163 struct ip_tunnel *iter;
165 for (tp = ipip6_bucket(sitn, t);
166 (iter = rtnl_dereference(*tp)) != NULL;
169 rcu_assign_pointer(*tp, t->next);
175 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
177 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
179 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
180 rcu_assign_pointer(*tp, t);
183 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
185 #ifdef CONFIG_IPV6_SIT_6RD
186 struct ip_tunnel *t = netdev_priv(dev);
188 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) {
189 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
190 t->ip6rd.relay_prefix = 0;
191 t->ip6rd.prefixlen = 16;
192 t->ip6rd.relay_prefixlen = 0;
194 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
195 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
200 static int ipip6_tunnel_create(struct net_device *dev)
202 struct ip_tunnel *t = netdev_priv(dev);
203 struct net *net = dev_net(dev);
204 struct sit_net *sitn = net_generic(net, sit_net_id);
207 __dev_addr_set(dev, &t->parms.iph.saddr, 4);
208 memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
210 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
211 dev->priv_flags |= IFF_ISATAP;
213 dev->rtnl_link_ops = &sit_link_ops;
215 err = register_netdevice(dev);
219 ipip6_tunnel_clone_6rd(dev, sitn);
221 ipip6_tunnel_link(sitn, t);
228 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
229 struct ip_tunnel_parm *parms, int create)
231 __be32 remote = parms->iph.daddr;
232 __be32 local = parms->iph.saddr;
233 struct ip_tunnel *t, *nt;
234 struct ip_tunnel __rcu **tp;
235 struct net_device *dev;
237 struct sit_net *sitn = net_generic(net, sit_net_id);
239 for (tp = __ipip6_bucket(sitn, parms);
240 (t = rtnl_dereference(*tp)) != NULL;
242 if (local == t->parms.iph.saddr &&
243 remote == t->parms.iph.daddr &&
244 parms->link == t->parms.link) {
254 if (parms->name[0]) {
255 if (!dev_valid_name(parms->name))
257 strlcpy(name, parms->name, IFNAMSIZ);
259 strcpy(name, "sit%d");
261 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
266 dev_net_set(dev, net);
268 nt = netdev_priv(dev);
271 if (ipip6_tunnel_create(dev) < 0)
275 strcpy(parms->name, dev->name);
285 #define for_each_prl_rcu(start) \
286 for (prl = rcu_dereference(start); \
288 prl = rcu_dereference(prl->next))
290 static struct ip_tunnel_prl_entry *
291 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
293 struct ip_tunnel_prl_entry *prl;
295 for_each_prl_rcu(t->prl)
296 if (prl->addr == addr)
302 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a)
304 struct ip_tunnel *t = netdev_priv(dev);
305 struct ip_tunnel_prl kprl, *kp;
306 struct ip_tunnel_prl_entry *prl;
307 unsigned int cmax, c = 0, ca, len;
310 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
313 if (copy_from_user(&kprl, a, sizeof(kprl)))
315 cmax = kprl.datalen / sizeof(kprl);
316 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
319 /* For simple GET or for root users,
320 * we try harder to allocate.
322 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
323 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) :
326 ca = min(t->prl_count, cmax);
329 /* We don't try hard to allocate much memory for
331 * For root users, retry allocating enough memory for
334 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT |
343 for_each_prl_rcu(t->prl) {
346 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
348 kp[c].addr = prl->addr;
349 kp[c].flags = prl->flags;
351 if (kprl.addr != htonl(INADDR_ANY))
357 len = sizeof(*kp) * c;
359 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
368 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
370 struct ip_tunnel_prl_entry *p;
373 if (a->addr == htonl(INADDR_ANY))
378 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
379 if (p->addr == a->addr) {
394 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
404 rcu_assign_pointer(t->prl, p);
409 static void prl_list_destroy_rcu(struct rcu_head *head)
411 struct ip_tunnel_prl_entry *p, *n;
413 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
415 n = rcu_dereference_protected(p->next, 1);
422 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
424 struct ip_tunnel_prl_entry *x;
425 struct ip_tunnel_prl_entry __rcu **p;
430 if (a && a->addr != htonl(INADDR_ANY)) {
432 (x = rtnl_dereference(*p)) != NULL;
434 if (x->addr == a->addr) {
436 kfree_rcu(x, rcu_head);
443 x = rtnl_dereference(t->prl);
446 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
454 static int ipip6_tunnel_prl_ctl(struct net_device *dev,
455 struct ip_tunnel_prl __user *data, int cmd)
457 struct ip_tunnel *t = netdev_priv(dev);
458 struct ip_tunnel_prl prl;
461 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
463 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
466 if (copy_from_user(&prl, data, sizeof(prl)))
471 err = ipip6_tunnel_del_prl(t, &prl);
475 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
478 dst_cache_reset(&t->dst_cache);
479 netdev_state_change(dev);
484 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
486 struct ip_tunnel_prl_entry *p;
490 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
492 if (p->flags & PRL_DEFAULT)
493 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
495 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
497 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
499 if (ipv6_addr_is_isatap(addr6) &&
500 (addr6->s6_addr32[3] == iph->saddr) &&
501 ipv6_chk_prefix(addr6, t->dev))
502 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
510 static void ipip6_tunnel_uninit(struct net_device *dev)
512 struct ip_tunnel *tunnel = netdev_priv(dev);
513 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
515 if (dev == sitn->fb_tunnel_dev) {
516 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
518 ipip6_tunnel_unlink(sitn, tunnel);
519 ipip6_tunnel_del_prl(tunnel, NULL);
521 dst_cache_reset(&tunnel->dst_cache);
522 dev_put_track(dev, &tunnel->dev_tracker);
525 static int ipip6_err(struct sk_buff *skb, u32 info)
527 const struct iphdr *iph = (const struct iphdr *)skb->data;
528 const int type = icmp_hdr(skb)->type;
529 const int code = icmp_hdr(skb)->code;
530 unsigned int data_len = 0;
537 case ICMP_PARAMETERPROB:
540 case ICMP_DEST_UNREACH:
543 /* Impossible event. */
546 /* All others are translated to HOST_UNREACH.
547 rfc2003 contains "deep thoughts" about NET_UNREACH,
548 I believe they are just ether pollution. --ANK
553 case ICMP_TIME_EXCEEDED:
554 if (code != ICMP_EXC_TTL)
556 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
564 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
565 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
566 iph->daddr, iph->saddr, sifindex);
570 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
571 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
572 t->parms.link, iph->protocol);
576 if (type == ICMP_REDIRECT) {
577 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link,
584 if (__in6_dev_get(skb->dev) &&
585 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
588 if (t->parms.iph.daddr == 0)
591 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
594 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
598 t->err_time = jiffies;
603 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
604 const struct in6_addr *v6addr)
607 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
612 /* Checks if an address matches an address on the tunnel interface.
613 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
615 * This function is called after we considered the packet as spoofed
617 * We may have a router that is doing NAT for proto 41 packets
618 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
619 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
620 * function will return true, dropping the packet.
621 * But, we can still check if is spoofed against the IP
622 * addresses associated with the interface.
624 static bool only_dnatted(const struct ip_tunnel *tunnel,
625 const struct in6_addr *v6dst)
629 #ifdef CONFIG_IPV6_SIT_6RD
630 prefix_len = tunnel->ip6rd.prefixlen + 32
631 - tunnel->ip6rd.relay_prefixlen;
635 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
638 /* Returns true if a packet is spoofed */
639 static bool packet_is_spoofed(struct sk_buff *skb,
640 const struct iphdr *iph,
641 struct ip_tunnel *tunnel)
643 const struct ipv6hdr *ipv6h;
645 if (tunnel->dev->priv_flags & IFF_ISATAP) {
646 if (!isatap_chksrc(skb, iph, tunnel))
652 if (tunnel->dev->flags & IFF_POINTOPOINT)
655 ipv6h = ipv6_hdr(skb);
657 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
658 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
659 &iph->saddr, &ipv6h->saddr,
660 &iph->daddr, &ipv6h->daddr);
664 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
667 if (only_dnatted(tunnel, &ipv6h->daddr))
670 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
671 &iph->saddr, &ipv6h->saddr,
672 &iph->daddr, &ipv6h->daddr);
676 static int ipip6_rcv(struct sk_buff *skb)
678 const struct iphdr *iph = ip_hdr(skb);
679 struct ip_tunnel *tunnel;
683 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
684 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
685 iph->saddr, iph->daddr, sifindex);
687 struct pcpu_sw_netstats *tstats;
689 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
690 tunnel->parms.iph.protocol != 0)
693 skb->mac_header = skb->network_header;
694 skb_reset_network_header(skb);
695 IPCB(skb)->flags = 0;
696 skb->dev = tunnel->dev;
698 if (packet_is_spoofed(skb, iph, tunnel)) {
699 tunnel->dev->stats.rx_errors++;
703 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
704 !net_eq(tunnel->net, dev_net(tunnel->dev))))
707 /* skb can be uncloned in iptunnel_pull_header, so
708 * old iph is no longer valid
710 iph = (const struct iphdr *)skb_mac_header(skb);
711 skb_reset_mac_header(skb);
713 err = IP_ECN_decapsulate(iph, skb);
716 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
717 &iph->saddr, iph->tos);
719 ++tunnel->dev->stats.rx_frame_errors;
720 ++tunnel->dev->stats.rx_errors;
725 tstats = this_cpu_ptr(tunnel->dev->tstats);
726 u64_stats_update_begin(&tstats->syncp);
727 tstats->rx_packets++;
728 tstats->rx_bytes += skb->len;
729 u64_stats_update_end(&tstats->syncp);
736 /* no tunnel matched, let upstream know, ipsec may handle it */
743 static const struct tnl_ptk_info ipip_tpi = {
744 /* no tunnel info required for ipip. */
745 .proto = htons(ETH_P_IP),
748 #if IS_ENABLED(CONFIG_MPLS)
749 static const struct tnl_ptk_info mplsip_tpi = {
750 /* no tunnel info required for mplsip. */
751 .proto = htons(ETH_P_MPLS_UC),
755 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
757 const struct iphdr *iph;
758 struct ip_tunnel *tunnel;
761 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
764 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
765 iph->saddr, iph->daddr, sifindex);
767 const struct tnl_ptk_info *tpi;
769 if (tunnel->parms.iph.protocol != ipproto &&
770 tunnel->parms.iph.protocol != 0)
773 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
775 #if IS_ENABLED(CONFIG_MPLS)
776 if (ipproto == IPPROTO_MPLS)
781 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
783 skb_reset_mac_header(skb);
785 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
795 static int ipip_rcv(struct sk_buff *skb)
797 return sit_tunnel_rcv(skb, IPPROTO_IPIP);
800 #if IS_ENABLED(CONFIG_MPLS)
801 static int mplsip_rcv(struct sk_buff *skb)
803 return sit_tunnel_rcv(skb, IPPROTO_MPLS);
808 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
809 * stores the embedded IPv4 address in v4dst and returns true.
811 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
814 #ifdef CONFIG_IPV6_SIT_6RD
815 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
816 tunnel->ip6rd.prefixlen)) {
817 unsigned int pbw0, pbi0;
821 pbw0 = tunnel->ip6rd.prefixlen >> 5;
822 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
824 d = tunnel->ip6rd.relay_prefixlen < 32 ?
825 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
826 tunnel->ip6rd.relay_prefixlen : 0;
828 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
830 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
833 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
837 if (v6dst->s6_addr16[0] == htons(0x2002)) {
838 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
839 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
846 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
847 const struct in6_addr *v6dst)
850 check_6rd(tunnel, v6dst, &dst);
855 * This function assumes it is being called from dev_queue_xmit()
856 * and that skb is filled properly by that function.
859 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
860 struct net_device *dev)
862 struct ip_tunnel *tunnel = netdev_priv(dev);
863 const struct iphdr *tiph = &tunnel->parms.iph;
864 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
865 u8 tos = tunnel->parms.iph.tos;
866 __be16 df = tiph->frag_off;
867 struct rtable *rt; /* Route to the other host */
868 struct net_device *tdev; /* Device to other host */
869 unsigned int max_headroom; /* The extra header space needed */
870 __be32 dst = tiph->daddr;
873 const struct in6_addr *addr6;
876 u8 protocol = IPPROTO_IPV6;
877 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
880 tos = ipv6_get_dsfield(iph6);
882 /* ISATAP (RFC4214) - must come before 6to4 */
883 if (dev->priv_flags & IFF_ISATAP) {
884 struct neighbour *neigh = NULL;
885 bool do_tx_error = false;
888 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
891 net_dbg_ratelimited("nexthop == NULL\n");
895 addr6 = (const struct in6_addr *)&neigh->primary_key;
896 addr_type = ipv6_addr_type(addr6);
898 if ((addr_type & IPV6_ADDR_UNICAST) &&
899 ipv6_addr_is_isatap(addr6))
900 dst = addr6->s6_addr32[3];
904 neigh_release(neigh);
910 dst = try_6rd(tunnel, &iph6->daddr);
913 struct neighbour *neigh = NULL;
914 bool do_tx_error = false;
917 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
920 net_dbg_ratelimited("nexthop == NULL\n");
924 addr6 = (const struct in6_addr *)&neigh->primary_key;
925 addr_type = ipv6_addr_type(addr6);
927 if (addr_type == IPV6_ADDR_ANY) {
928 addr6 = &ipv6_hdr(skb)->daddr;
929 addr_type = ipv6_addr_type(addr6);
932 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
933 dst = addr6->s6_addr32[3];
937 neigh_release(neigh);
942 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
943 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
944 0, dst, tiph->saddr, 0, 0,
945 sock_net_uid(tunnel->net, NULL));
947 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr);
949 rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
951 dev->stats.tx_carrier_errors++;
954 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr);
957 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
959 dev->stats.tx_carrier_errors++;
966 dev->stats.collisions++;
970 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
976 mtu = dst_mtu(&rt->dst) - t_hlen;
978 if (mtu < IPV4_MIN_MTU) {
979 dev->stats.collisions++;
984 if (mtu < IPV6_MIN_MTU) {
989 if (tunnel->parms.iph.daddr)
990 skb_dst_update_pmtu_no_confirm(skb, mtu);
992 if (skb->len > mtu && !skb_is_gso(skb)) {
993 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
999 if (tunnel->err_count > 0) {
1000 if (time_before(jiffies,
1001 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
1002 tunnel->err_count--;
1003 dst_link_failure(skb);
1005 tunnel->err_count = 0;
1009 * Okay, now see if we can stuff it in the buffer as-is.
1011 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
1013 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1014 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1015 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
1018 dev->stats.tx_dropped++;
1020 return NETDEV_TX_OK;
1023 skb_set_owner_w(new_skb, skb->sk);
1026 iph6 = ipv6_hdr(skb);
1030 ttl = iph6->hop_limit;
1031 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
1033 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
1038 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1040 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
1041 df, !net_eq(tunnel->net, dev_net(dev)));
1042 return NETDEV_TX_OK;
1045 dst_link_failure(skb);
1048 dev->stats.tx_errors++;
1049 return NETDEV_TX_OK;
1052 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
1053 struct net_device *dev, u8 ipproto)
1055 struct ip_tunnel *tunnel = netdev_priv(dev);
1056 const struct iphdr *tiph = &tunnel->parms.iph;
1058 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
1061 skb_set_inner_ipproto(skb, ipproto);
1063 ip_tunnel_xmit(skb, dev, tiph, ipproto);
1064 return NETDEV_TX_OK;
1067 dev->stats.tx_errors++;
1068 return NETDEV_TX_OK;
1071 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1072 struct net_device *dev)
1074 if (!pskb_inet_may_pull(skb))
1077 switch (skb->protocol) {
1078 case htons(ETH_P_IP):
1079 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
1081 case htons(ETH_P_IPV6):
1082 ipip6_tunnel_xmit(skb, dev);
1084 #if IS_ENABLED(CONFIG_MPLS)
1085 case htons(ETH_P_MPLS_UC):
1086 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
1093 return NETDEV_TX_OK;
1096 dev->stats.tx_errors++;
1098 return NETDEV_TX_OK;
1102 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1104 struct net_device *tdev = NULL;
1105 struct ip_tunnel *tunnel;
1106 const struct iphdr *iph;
1109 tunnel = netdev_priv(dev);
1110 iph = &tunnel->parms.iph;
1113 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1115 iph->daddr, iph->saddr,
1119 tunnel->parms.link);
1125 dev->flags |= IFF_POINTOPOINT;
1128 if (!tdev && tunnel->parms.link)
1129 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1131 if (tdev && !netif_is_l3_master(tdev)) {
1132 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1134 dev->mtu = tdev->mtu - t_hlen;
1135 if (dev->mtu < IPV6_MIN_MTU)
1136 dev->mtu = IPV6_MIN_MTU;
1140 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
1143 struct net *net = t->net;
1144 struct sit_net *sitn = net_generic(net, sit_net_id);
1146 ipip6_tunnel_unlink(sitn, t);
1148 t->parms.iph.saddr = p->iph.saddr;
1149 t->parms.iph.daddr = p->iph.daddr;
1150 __dev_addr_set(t->dev, &p->iph.saddr, 4);
1151 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1152 ipip6_tunnel_link(sitn, t);
1153 t->parms.iph.ttl = p->iph.ttl;
1154 t->parms.iph.tos = p->iph.tos;
1155 t->parms.iph.frag_off = p->iph.frag_off;
1156 if (t->parms.link != p->link || t->fwmark != fwmark) {
1157 t->parms.link = p->link;
1159 ipip6_tunnel_bind_dev(t->dev);
1161 dst_cache_reset(&t->dst_cache);
1162 netdev_state_change(t->dev);
1165 #ifdef CONFIG_IPV6_SIT_6RD
1166 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1167 struct ip_tunnel_6rd *ip6rd)
1169 struct in6_addr prefix;
1170 __be32 relay_prefix;
1172 if (ip6rd->relay_prefixlen > 32 ||
1173 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1176 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1177 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1179 if (ip6rd->relay_prefixlen)
1180 relay_prefix = ip6rd->relay_prefix &
1181 htonl(0xffffffffUL <<
1182 (32 - ip6rd->relay_prefixlen));
1185 if (relay_prefix != ip6rd->relay_prefix)
1188 t->ip6rd.prefix = prefix;
1189 t->ip6rd.relay_prefix = relay_prefix;
1190 t->ip6rd.prefixlen = ip6rd->prefixlen;
1191 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1192 dst_cache_reset(&t->dst_cache);
1193 netdev_state_change(t->dev);
1198 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data)
1200 struct ip_tunnel *t = netdev_priv(dev);
1201 struct ip_tunnel_6rd ip6rd;
1202 struct ip_tunnel_parm p;
1204 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1205 if (copy_from_user(&p, data, sizeof(p)))
1207 t = ipip6_tunnel_locate(t->net, &p, 0);
1210 t = netdev_priv(dev);
1212 ip6rd.prefix = t->ip6rd.prefix;
1213 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1214 ip6rd.prefixlen = t->ip6rd.prefixlen;
1215 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1216 if (copy_to_user(data, &ip6rd, sizeof(ip6rd)))
1222 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data,
1225 struct ip_tunnel *t = netdev_priv(dev);
1226 struct ip_tunnel_6rd ip6rd;
1229 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
1231 if (copy_from_user(&ip6rd, data, sizeof(ip6rd)))
1234 if (cmd != SIOCDEL6RD) {
1235 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1239 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev));
1243 #endif /* CONFIG_IPV6_SIT_6RD */
1245 static bool ipip6_valid_ip_proto(u8 ipproto)
1247 return ipproto == IPPROTO_IPV6 ||
1248 ipproto == IPPROTO_IPIP ||
1249 #if IS_ENABLED(CONFIG_MPLS)
1250 ipproto == IPPROTO_MPLS ||
1256 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p)
1258 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1261 if (!ipip6_valid_ip_proto(p->iph.protocol))
1263 if (p->iph.version != 4 ||
1264 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
1268 p->iph.frag_off |= htons(IP_DF);
1273 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p)
1275 struct ip_tunnel *t = netdev_priv(dev);
1277 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
1278 t = ipip6_tunnel_locate(t->net, p, 0);
1280 t = netdev_priv(dev);
1281 memcpy(p, &t->parms, sizeof(*p));
1286 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p)
1288 struct ip_tunnel *t = netdev_priv(dev);
1291 err = __ipip6_tunnel_ioctl_validate(t->net, p);
1295 t = ipip6_tunnel_locate(t->net, p, 1);
1302 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p)
1304 struct ip_tunnel *t = netdev_priv(dev);
1307 err = __ipip6_tunnel_ioctl_validate(t->net, p);
1311 t = ipip6_tunnel_locate(t->net, p, 0);
1312 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1320 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) ||
1321 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr))
1323 t = netdev_priv(dev);
1326 ipip6_tunnel_update(t, p, t->fwmark);
1333 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p)
1335 struct ip_tunnel *t = netdev_priv(dev);
1337 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
1340 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1341 t = ipip6_tunnel_locate(t->net, p, 0);
1344 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev))
1348 unregister_netdevice(dev);
1353 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
1357 return ipip6_tunnel_get(dev, p);
1359 return ipip6_tunnel_add(dev, p);
1361 return ipip6_tunnel_change(dev, p);
1363 return ipip6_tunnel_del(dev, p);
1370 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1371 void __user *data, int cmd)
1378 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd);
1380 return ipip6_tunnel_get_prl(dev, data);
1384 return ipip6_tunnel_prl_ctl(dev, data, cmd);
1385 #ifdef CONFIG_IPV6_SIT_6RD
1387 return ipip6_tunnel_get6rd(dev, data);
1391 return ipip6_tunnel_6rdctl(dev, data, cmd);
1398 static const struct net_device_ops ipip6_netdev_ops = {
1399 .ndo_init = ipip6_tunnel_init,
1400 .ndo_uninit = ipip6_tunnel_uninit,
1401 .ndo_start_xmit = sit_tunnel_xmit,
1402 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate,
1403 .ndo_get_stats64 = dev_get_tstats64,
1404 .ndo_get_iflink = ip_tunnel_get_iflink,
1405 .ndo_tunnel_ctl = ipip6_tunnel_ctl,
1408 static void ipip6_dev_free(struct net_device *dev)
1410 struct ip_tunnel *tunnel = netdev_priv(dev);
1412 dst_cache_destroy(&tunnel->dst_cache);
1413 free_percpu(dev->tstats);
1416 #define SIT_FEATURES (NETIF_F_SG | \
1417 NETIF_F_FRAGLIST | \
1419 NETIF_F_GSO_SOFTWARE | \
1422 static void ipip6_tunnel_setup(struct net_device *dev)
1424 struct ip_tunnel *tunnel = netdev_priv(dev);
1425 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1427 dev->netdev_ops = &ipip6_netdev_ops;
1428 dev->header_ops = &ip_tunnel_header_ops;
1429 dev->needs_free_netdev = true;
1430 dev->priv_destructor = ipip6_dev_free;
1432 dev->type = ARPHRD_SIT;
1433 dev->mtu = ETH_DATA_LEN - t_hlen;
1434 dev->min_mtu = IPV6_MIN_MTU;
1435 dev->max_mtu = IP6_MAX_MTU - t_hlen;
1436 dev->flags = IFF_NOARP;
1437 netif_keep_dst(dev);
1439 dev->features |= NETIF_F_LLTX;
1440 dev->features |= SIT_FEATURES;
1441 dev->hw_features |= SIT_FEATURES;
1444 static int ipip6_tunnel_init(struct net_device *dev)
1446 struct ip_tunnel *tunnel = netdev_priv(dev);
1450 tunnel->net = dev_net(dev);
1451 strcpy(tunnel->parms.name, dev->name);
1453 ipip6_tunnel_bind_dev(dev);
1454 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1458 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1460 free_percpu(dev->tstats);
1464 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
1468 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1470 struct ip_tunnel *tunnel = netdev_priv(dev);
1471 struct iphdr *iph = &tunnel->parms.iph;
1472 struct net *net = dev_net(dev);
1473 struct sit_net *sitn = net_generic(net, sit_net_id);
1476 iph->protocol = IPPROTO_IPV6;
1480 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1483 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
1484 struct netlink_ext_ack *extack)
1488 if (!data || !data[IFLA_IPTUN_PROTO])
1491 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1492 if (!ipip6_valid_ip_proto(proto))
1498 static void ipip6_netlink_parms(struct nlattr *data[],
1499 struct ip_tunnel_parm *parms,
1502 memset(parms, 0, sizeof(*parms));
1504 parms->iph.version = 4;
1505 parms->iph.protocol = IPPROTO_IPV6;
1507 parms->iph.ttl = 64;
1512 if (data[IFLA_IPTUN_LINK])
1513 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1515 if (data[IFLA_IPTUN_LOCAL])
1516 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1518 if (data[IFLA_IPTUN_REMOTE])
1519 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1521 if (data[IFLA_IPTUN_TTL]) {
1522 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1524 parms->iph.frag_off = htons(IP_DF);
1527 if (data[IFLA_IPTUN_TOS])
1528 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1530 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1531 parms->iph.frag_off = htons(IP_DF);
1533 if (data[IFLA_IPTUN_FLAGS])
1534 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1536 if (data[IFLA_IPTUN_PROTO])
1537 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1539 if (data[IFLA_IPTUN_FWMARK])
1540 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1543 /* This function returns true when ENCAP attributes are present in the nl msg */
1544 static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1545 struct ip_tunnel_encap *ipencap)
1549 memset(ipencap, 0, sizeof(*ipencap));
1554 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1556 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1559 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1561 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1564 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1566 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1569 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1571 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1577 #ifdef CONFIG_IPV6_SIT_6RD
1578 /* This function returns true when 6RD attributes are present in the nl msg */
1579 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1580 struct ip_tunnel_6rd *ip6rd)
1583 memset(ip6rd, 0, sizeof(*ip6rd));
1588 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1590 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
1593 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1595 ip6rd->relay_prefix =
1596 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1599 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1601 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1604 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1606 ip6rd->relay_prefixlen =
1607 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1614 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1615 struct nlattr *tb[], struct nlattr *data[],
1616 struct netlink_ext_ack *extack)
1618 struct net *net = dev_net(dev);
1619 struct ip_tunnel *nt;
1620 struct ip_tunnel_encap ipencap;
1621 #ifdef CONFIG_IPV6_SIT_6RD
1622 struct ip_tunnel_6rd ip6rd;
1626 nt = netdev_priv(dev);
1628 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1629 err = ip_tunnel_encap_setup(nt, &ipencap);
1634 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
1636 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1639 err = ipip6_tunnel_create(dev);
1644 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
1646 if (mtu >= IPV6_MIN_MTU &&
1647 mtu <= IP6_MAX_MTU - dev->hard_header_len)
1651 #ifdef CONFIG_IPV6_SIT_6RD
1652 if (ipip6_netlink_6rd_parms(data, &ip6rd)) {
1653 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1655 unregister_netdevice_queue(dev, NULL);
1662 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1663 struct nlattr *data[],
1664 struct netlink_ext_ack *extack)
1666 struct ip_tunnel *t = netdev_priv(dev);
1667 struct ip_tunnel_parm p;
1668 struct ip_tunnel_encap ipencap;
1669 struct net *net = t->net;
1670 struct sit_net *sitn = net_generic(net, sit_net_id);
1671 #ifdef CONFIG_IPV6_SIT_6RD
1672 struct ip_tunnel_6rd ip6rd;
1674 __u32 fwmark = t->fwmark;
1677 if (dev == sitn->fb_tunnel_dev)
1680 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1681 err = ip_tunnel_encap_setup(t, &ipencap);
1686 ipip6_netlink_parms(data, &p, &fwmark);
1688 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1689 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1692 t = ipip6_tunnel_locate(net, &p, 0);
1698 t = netdev_priv(dev);
1700 ipip6_tunnel_update(t, &p, fwmark);
1702 #ifdef CONFIG_IPV6_SIT_6RD
1703 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1704 return ipip6_tunnel_update_6rd(t, &ip6rd);
1710 static size_t ipip6_get_size(const struct net_device *dev)
1713 /* IFLA_IPTUN_LINK */
1715 /* IFLA_IPTUN_LOCAL */
1717 /* IFLA_IPTUN_REMOTE */
1719 /* IFLA_IPTUN_TTL */
1721 /* IFLA_IPTUN_TOS */
1723 /* IFLA_IPTUN_PMTUDISC */
1725 /* IFLA_IPTUN_FLAGS */
1727 /* IFLA_IPTUN_PROTO */
1729 #ifdef CONFIG_IPV6_SIT_6RD
1730 /* IFLA_IPTUN_6RD_PREFIX */
1731 nla_total_size(sizeof(struct in6_addr)) +
1732 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1734 /* IFLA_IPTUN_6RD_PREFIXLEN */
1736 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1739 /* IFLA_IPTUN_ENCAP_TYPE */
1741 /* IFLA_IPTUN_ENCAP_FLAGS */
1743 /* IFLA_IPTUN_ENCAP_SPORT */
1745 /* IFLA_IPTUN_ENCAP_DPORT */
1747 /* IFLA_IPTUN_FWMARK */
1752 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1754 struct ip_tunnel *tunnel = netdev_priv(dev);
1755 struct ip_tunnel_parm *parm = &tunnel->parms;
1757 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1758 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1759 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1760 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1761 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1762 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1763 !!(parm->iph.frag_off & htons(IP_DF))) ||
1764 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1765 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
1766 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
1767 goto nla_put_failure;
1769 #ifdef CONFIG_IPV6_SIT_6RD
1770 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1771 &tunnel->ip6rd.prefix) ||
1772 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1773 tunnel->ip6rd.relay_prefix) ||
1774 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1775 tunnel->ip6rd.prefixlen) ||
1776 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1777 tunnel->ip6rd.relay_prefixlen))
1778 goto nla_put_failure;
1781 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1782 tunnel->encap.type) ||
1783 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1784 tunnel->encap.sport) ||
1785 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1786 tunnel->encap.dport) ||
1787 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1788 tunnel->encap.flags))
1789 goto nla_put_failure;
1797 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1798 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1799 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1800 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1801 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1802 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1803 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1804 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1805 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1806 #ifdef CONFIG_IPV6_SIT_6RD
1807 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1808 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1809 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1810 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1812 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1813 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1814 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1815 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
1816 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
1819 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1821 struct net *net = dev_net(dev);
1822 struct sit_net *sitn = net_generic(net, sit_net_id);
1824 if (dev != sitn->fb_tunnel_dev)
1825 unregister_netdevice_queue(dev, head);
1828 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1830 .maxtype = IFLA_IPTUN_MAX,
1831 .policy = ipip6_policy,
1832 .priv_size = sizeof(struct ip_tunnel),
1833 .setup = ipip6_tunnel_setup,
1834 .validate = ipip6_validate,
1835 .newlink = ipip6_newlink,
1836 .changelink = ipip6_changelink,
1837 .get_size = ipip6_get_size,
1838 .fill_info = ipip6_fill_info,
1839 .dellink = ipip6_dellink,
1840 .get_link_net = ip_tunnel_get_link_net,
1843 static struct xfrm_tunnel sit_handler __read_mostly = {
1844 .handler = ipip6_rcv,
1845 .err_handler = ipip6_err,
1849 static struct xfrm_tunnel ipip_handler __read_mostly = {
1850 .handler = ipip_rcv,
1851 .err_handler = ipip6_err,
1855 #if IS_ENABLED(CONFIG_MPLS)
1856 static struct xfrm_tunnel mplsip_handler __read_mostly = {
1857 .handler = mplsip_rcv,
1858 .err_handler = ipip6_err,
1863 static void __net_exit sit_destroy_tunnels(struct net *net,
1864 struct list_head *head)
1866 struct sit_net *sitn = net_generic(net, sit_net_id);
1867 struct net_device *dev, *aux;
1870 for_each_netdev_safe(net, dev, aux)
1871 if (dev->rtnl_link_ops == &sit_link_ops)
1872 unregister_netdevice_queue(dev, head);
1874 for (prio = 0; prio < 4; prio++) {
1876 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) {
1877 struct ip_tunnel *t;
1879 t = rtnl_dereference(sitn->tunnels[prio][h]);
1881 /* If dev is in the same netns, it has already
1882 * been added to the list by the previous loop.
1884 if (!net_eq(dev_net(t->dev), net))
1885 unregister_netdevice_queue(t->dev,
1887 t = rtnl_dereference(t->next);
1893 static int __net_init sit_init_net(struct net *net)
1895 struct sit_net *sitn = net_generic(net, sit_net_id);
1896 struct ip_tunnel *t;
1899 sitn->tunnels[0] = sitn->tunnels_wc;
1900 sitn->tunnels[1] = sitn->tunnels_l;
1901 sitn->tunnels[2] = sitn->tunnels_r;
1902 sitn->tunnels[3] = sitn->tunnels_r_l;
1904 if (!net_has_fallback_tunnels(net))
1907 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1909 ipip6_tunnel_setup);
1910 if (!sitn->fb_tunnel_dev) {
1914 dev_net_set(sitn->fb_tunnel_dev, net);
1915 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1916 /* FB netdevice is special: we have one, and only one per netns.
1917 * Allowing to move it to another netns is clearly unsafe.
1919 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1921 err = register_netdev(sitn->fb_tunnel_dev);
1925 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1926 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1928 t = netdev_priv(sitn->fb_tunnel_dev);
1930 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1934 free_netdev(sitn->fb_tunnel_dev);
1939 static void __net_exit sit_exit_batch_net(struct list_head *net_list)
1945 list_for_each_entry(net, net_list, exit_list)
1946 sit_destroy_tunnels(net, &list);
1948 unregister_netdevice_many(&list);
1952 static struct pernet_operations sit_net_ops = {
1953 .init = sit_init_net,
1954 .exit_batch = sit_exit_batch_net,
1956 .size = sizeof(struct sit_net),
1959 static void __exit sit_cleanup(void)
1961 rtnl_link_unregister(&sit_link_ops);
1962 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1963 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1964 #if IS_ENABLED(CONFIG_MPLS)
1965 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1968 unregister_pernet_device(&sit_net_ops);
1969 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1972 static int __init sit_init(void)
1976 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
1978 err = register_pernet_device(&sit_net_ops);
1981 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1983 pr_info("%s: can't register ip6ip4\n", __func__);
1984 goto xfrm_tunnel_failed;
1986 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1988 pr_info("%s: can't register ip4ip4\n", __func__);
1989 goto xfrm_tunnel4_failed;
1991 #if IS_ENABLED(CONFIG_MPLS)
1992 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
1994 pr_info("%s: can't register mplsip\n", __func__);
1995 goto xfrm_tunnel_mpls_failed;
1998 err = rtnl_link_register(&sit_link_ops);
2000 goto rtnl_link_failed;
2006 #if IS_ENABLED(CONFIG_MPLS)
2007 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
2008 xfrm_tunnel_mpls_failed:
2010 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
2011 xfrm_tunnel4_failed:
2012 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
2014 unregister_pernet_device(&sit_net_ops);
2018 module_init(sit_init);
2019 module_exit(sit_cleanup);
2020 MODULE_LICENSE("GPL");
2021 MODULE_ALIAS_RTNL_LINK("sit");
2022 MODULE_ALIAS_NETDEV("sit0");