1 // SPDX-License-Identifier: GPL-2.0
3 * XFRM virtual interface
5 * Copyright (C) 2018 secunet Security Networks AG
8 * Steffen Klassert <steffen.klassert@secunet.com>
11 #include <linux/module.h>
12 #include <linux/capability.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/sockios.h>
16 #include <linux/icmp.h>
20 #include <linux/net.h>
21 #include <linux/in6.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_link.h>
24 #include <linux/if_arp.h>
25 #include <linux/icmpv6.h>
26 #include <linux/init.h>
27 #include <linux/route.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/netfilter_ipv6.h>
30 #include <linux/slab.h>
31 #include <linux/hash.h>
33 #include <linux/uaccess.h>
34 #include <linux/atomic.h>
39 #include <net/ip6_route.h>
40 #include <net/addrconf.h>
42 #include <net/net_namespace.h>
43 #include <net/netns/generic.h>
44 #include <linux/etherdevice.h>
46 static int xfrmi_dev_init(struct net_device *dev);
47 static void xfrmi_dev_setup(struct net_device *dev);
48 static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
49 static unsigned int xfrmi_net_id __read_mostly;
52 /* lists for storing interfaces in use */
53 struct xfrm_if __rcu *xfrmi[1];
56 #define for_each_xfrmi_rcu(start, xi) \
57 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
59 static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
61 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
64 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
65 if (x->if_id == xi->p.if_id &&
66 (xi->dev->flags & IFF_UP))
73 static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb)
75 struct xfrmi_net *xfrmn;
82 xfrmn = net_generic(dev_net(skb->dev), xfrmi_net_id);
83 ifindex = skb->dev->ifindex;
85 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
86 if (ifindex == xi->dev->ifindex &&
87 (xi->dev->flags & IFF_UP))
94 static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
96 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
98 rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
99 rcu_assign_pointer(*xip, xi);
102 static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
104 struct xfrm_if __rcu **xip;
105 struct xfrm_if *iter;
107 for (xip = &xfrmn->xfrmi[0];
108 (iter = rtnl_dereference(*xip)) != NULL;
111 rcu_assign_pointer(*xip, xi->next);
117 static void xfrmi_dev_free(struct net_device *dev)
119 free_percpu(dev->tstats);
122 static int xfrmi_create2(struct net_device *dev)
124 struct xfrm_if *xi = netdev_priv(dev);
125 struct net *net = dev_net(dev);
126 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
129 dev->rtnl_link_ops = &xfrmi_link_ops;
130 err = register_netdevice(dev);
134 strcpy(xi->p.name, dev->name);
137 xfrmi_link(xfrmn, xi);
145 static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p)
147 struct net_device *dev;
153 strlcpy(name, p->name, IFNAMSIZ);
159 dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup);
165 dev_net_set(dev, net);
167 xi = netdev_priv(dev);
171 xi->phydev = dev_get_by_index(net, p->link);
177 err = xfrmi_create2(dev);
191 static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p,
194 struct xfrm_if __rcu **xip;
196 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
198 for (xip = &xfrmn->xfrmi[0];
199 (xi = rtnl_dereference(*xip)) != NULL;
201 if (xi->p.if_id == p->if_id) {
203 return ERR_PTR(-EEXIST);
209 return ERR_PTR(-ENODEV);
210 return xfrmi_create(net, p);
213 static void xfrmi_dev_uninit(struct net_device *dev)
215 struct xfrm_if *xi = netdev_priv(dev);
216 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
218 xfrmi_unlink(xfrmn, xi);
223 static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
226 skb->pkt_type = PACKET_HOST;
242 static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
244 struct pcpu_sw_netstats *tstats;
245 struct xfrm_mode *inner_mode;
246 struct net_device *dev;
247 struct xfrm_state *x;
254 x = xfrm_input_state(skb);
256 xi = xfrmi_lookup(xs_net(x), x);
264 dev->stats.rx_errors++;
265 dev->stats.rx_dropped++;
270 xnet = !net_eq(xi->net, dev_net(skb->dev));
273 inner_mode = x->inner_mode;
275 if (x->sel.family == AF_UNSPEC) {
276 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
277 if (inner_mode == NULL) {
278 XFRM_INC_STATS(dev_net(skb->dev),
279 LINUX_MIB_XFRMINSTATEMODEERROR);
284 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
285 inner_mode->afinfo->family))
289 xfrmi_scrub_packet(skb, xnet);
291 tstats = this_cpu_ptr(dev->tstats);
293 u64_stats_update_begin(&tstats->syncp);
294 tstats->rx_packets++;
295 tstats->rx_bytes += skb->len;
296 u64_stats_update_end(&tstats->syncp);
302 xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
304 struct xfrm_if *xi = netdev_priv(dev);
305 struct net_device_stats *stats = &xi->dev->stats;
306 struct dst_entry *dst = skb_dst(skb);
307 unsigned int length = skb->len;
308 struct net_device *tdev;
309 struct xfrm_state *x;
314 goto tx_err_link_failure;
317 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
321 goto tx_err_link_failure;
326 goto tx_err_link_failure;
328 if (x->if_id != xi->p.if_id)
329 goto tx_err_link_failure;
335 net_warn_ratelimited("%s: Local routing loop detected!\n",
337 goto tx_err_dst_release;
341 if (!skb->ignore_df && skb->len > mtu) {
342 skb_dst_update_pmtu(skb, mtu);
344 if (skb->protocol == htons(ETH_P_IPV6)) {
345 if (mtu < IPV6_MIN_MTU)
348 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
350 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
358 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
359 skb_dst_set(skb, dst);
362 err = dst_output(xi->net, skb->sk, skb);
363 if (net_xmit_eval(err) == 0) {
364 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
366 u64_stats_update_begin(&tstats->syncp);
367 tstats->tx_bytes += length;
368 tstats->tx_packets++;
369 u64_stats_update_end(&tstats->syncp);
372 stats->tx_aborted_errors++;
377 stats->tx_carrier_errors++;
378 dst_link_failure(skb);
384 static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
386 struct xfrm_if *xi = netdev_priv(dev);
387 struct net_device_stats *stats = &xi->dev->stats;
391 memset(&fl, 0, sizeof(fl));
393 switch (skb->protocol) {
394 case htons(ETH_P_IPV6):
395 xfrm_decode_session(skb, &fl, AF_INET6);
396 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
398 case htons(ETH_P_IP):
399 xfrm_decode_session(skb, &fl, AF_INET);
400 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
406 fl.flowi_oif = xi->phydev->ifindex;
408 ret = xfrmi_xmit2(skb, dev, &fl);
421 static int xfrmi4_err(struct sk_buff *skb, u32 info)
423 const struct iphdr *iph = (const struct iphdr *)skb->data;
424 struct net *net = dev_net(skb->dev);
425 int protocol = iph->protocol;
426 struct ip_comp_hdr *ipch;
427 struct ip_esp_hdr *esph;
428 struct ip_auth_hdr *ah ;
429 struct xfrm_state *x;
435 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
439 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
443 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
444 spi = htonl(ntohs(ipch->cpi));
450 switch (icmp_hdr(skb)->type) {
451 case ICMP_DEST_UNREACH:
452 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
460 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
461 spi, protocol, AF_INET);
465 xi = xfrmi_lookup(net, x);
471 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
472 ipv4_update_pmtu(skb, net, info, 0, protocol);
474 ipv4_redirect(skb, net, 0, protocol);
480 static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
481 u8 type, u8 code, int offset, __be32 info)
483 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
484 struct net *net = dev_net(skb->dev);
485 int protocol = iph->nexthdr;
486 struct ip_comp_hdr *ipch;
487 struct ip_esp_hdr *esph;
488 struct ip_auth_hdr *ah;
489 struct xfrm_state *x;
495 esph = (struct ip_esp_hdr *)(skb->data + offset);
499 ah = (struct ip_auth_hdr *)(skb->data + offset);
503 ipch = (struct ip_comp_hdr *)(skb->data + offset);
504 spi = htonl(ntohs(ipch->cpi));
510 if (type != ICMPV6_PKT_TOOBIG &&
511 type != NDISC_REDIRECT)
514 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
515 spi, protocol, AF_INET6);
519 xi = xfrmi_lookup(net, x);
525 if (type == NDISC_REDIRECT)
526 ip6_redirect(skb, net, skb->dev->ifindex, 0,
527 sock_net_uid(net, NULL));
529 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
535 static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
537 if (xi->p.link != p->link)
540 xi->p.if_id = p->if_id;
545 static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
547 struct net *net = dev_net(xi->dev);
548 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
551 xfrmi_unlink(xfrmn, xi);
553 err = xfrmi_change(xi, p);
554 xfrmi_link(xfrmn, xi);
555 netdev_state_change(xi->dev);
559 static void xfrmi_get_stats64(struct net_device *dev,
560 struct rtnl_link_stats64 *s)
567 for_each_possible_cpu(cpu) {
568 struct pcpu_sw_netstats *stats;
569 struct pcpu_sw_netstats tmp;
572 stats = per_cpu_ptr(dev->tstats, cpu);
574 start = u64_stats_fetch_begin_irq(&stats->syncp);
575 tmp.rx_packets = stats->rx_packets;
576 tmp.rx_bytes = stats->rx_bytes;
577 tmp.tx_packets = stats->tx_packets;
578 tmp.tx_bytes = stats->tx_bytes;
579 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
581 s->rx_packets += tmp.rx_packets;
582 s->rx_bytes += tmp.rx_bytes;
583 s->tx_packets += tmp.tx_packets;
584 s->tx_bytes += tmp.tx_bytes;
587 s->rx_dropped = dev->stats.rx_dropped;
588 s->tx_dropped = dev->stats.tx_dropped;
591 static int xfrmi_get_iflink(const struct net_device *dev)
593 struct xfrm_if *xi = netdev_priv(dev);
595 return xi->phydev->ifindex;
599 static const struct net_device_ops xfrmi_netdev_ops = {
600 .ndo_init = xfrmi_dev_init,
601 .ndo_uninit = xfrmi_dev_uninit,
602 .ndo_start_xmit = xfrmi_xmit,
603 .ndo_get_stats64 = xfrmi_get_stats64,
604 .ndo_get_iflink = xfrmi_get_iflink,
607 static void xfrmi_dev_setup(struct net_device *dev)
609 dev->netdev_ops = &xfrmi_netdev_ops;
610 dev->type = ARPHRD_NONE;
611 dev->hard_header_len = ETH_HLEN;
612 dev->min_header_len = ETH_HLEN;
613 dev->mtu = ETH_DATA_LEN;
614 dev->min_mtu = ETH_MIN_MTU;
615 dev->max_mtu = ETH_DATA_LEN;
616 dev->addr_len = ETH_ALEN;
617 dev->flags = IFF_NOARP;
618 dev->needs_free_netdev = true;
619 dev->priv_destructor = xfrmi_dev_free;
623 static int xfrmi_dev_init(struct net_device *dev)
625 struct xfrm_if *xi = netdev_priv(dev);
626 struct net_device *phydev = xi->phydev;
629 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
633 err = gro_cells_init(&xi->gro_cells, dev);
635 free_percpu(dev->tstats);
639 dev->features |= NETIF_F_LLTX;
641 dev->needed_headroom = phydev->needed_headroom;
642 dev->needed_tailroom = phydev->needed_tailroom;
644 if (is_zero_ether_addr(dev->dev_addr))
645 eth_hw_addr_inherit(dev, phydev);
646 if (is_zero_ether_addr(dev->broadcast))
647 memcpy(dev->broadcast, phydev->broadcast, dev->addr_len);
652 static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
653 struct netlink_ext_ack *extack)
658 static void xfrmi_netlink_parms(struct nlattr *data[],
659 struct xfrm_if_parms *parms)
661 memset(parms, 0, sizeof(*parms));
666 if (data[IFLA_XFRM_LINK])
667 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
669 if (data[IFLA_XFRM_IF_ID])
670 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
673 static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
674 struct nlattr *tb[], struct nlattr *data[],
675 struct netlink_ext_ack *extack)
677 struct net *net = dev_net(dev);
678 struct xfrm_if_parms *p;
681 xi = netdev_priv(dev);
684 xfrmi_netlink_parms(data, p);
686 if (!tb[IFLA_IFNAME])
689 nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ);
691 xi = xfrmi_locate(net, p, 1);
692 return PTR_ERR_OR_ZERO(xi);
695 static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
697 unregister_netdevice_queue(dev, head);
700 static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
701 struct nlattr *data[],
702 struct netlink_ext_ack *extack)
704 struct xfrm_if *xi = netdev_priv(dev);
705 struct net *net = dev_net(dev);
707 xfrmi_netlink_parms(data, &xi->p);
709 xi = xfrmi_locate(net, &xi->p, 0);
711 if (IS_ERR_OR_NULL(xi)) {
712 xi = netdev_priv(dev);
718 return xfrmi_update(xi, &xi->p);
721 static size_t xfrmi_get_size(const struct net_device *dev)
726 /* IFLA_XFRM_IF_ID */
731 static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
733 struct xfrm_if *xi = netdev_priv(dev);
734 struct xfrm_if_parms *parm = &xi->p;
736 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
737 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
738 goto nla_put_failure;
745 static struct net *xfrmi_get_link_net(const struct net_device *dev)
747 struct xfrm_if *xi = netdev_priv(dev);
749 return dev_net(xi->phydev);
752 static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
753 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
754 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
757 static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
759 .maxtype = IFLA_XFRM_MAX,
760 .policy = xfrmi_policy,
761 .priv_size = sizeof(struct xfrm_if),
762 .setup = xfrmi_dev_setup,
763 .validate = xfrmi_validate,
764 .newlink = xfrmi_newlink,
765 .dellink = xfrmi_dellink,
766 .changelink = xfrmi_changelink,
767 .get_size = xfrmi_get_size,
768 .fill_info = xfrmi_fill_info,
769 .get_link_net = xfrmi_get_link_net,
772 static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
777 xi = rtnl_dereference(xfrmn->xfrmi[0]);
781 unregister_netdevice_queue(xi->dev, &list);
782 unregister_netdevice_many(&list);
785 static int __net_init xfrmi_init_net(struct net *net)
790 static void __net_exit xfrmi_exit_net(struct net *net)
792 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
795 xfrmi_destroy_interfaces(xfrmn);
799 static struct pernet_operations xfrmi_net_ops = {
800 .init = xfrmi_init_net,
801 .exit = xfrmi_exit_net,
803 .size = sizeof(struct xfrmi_net),
806 static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
807 .handler = xfrm6_rcv,
808 .cb_handler = xfrmi_rcv_cb,
809 .err_handler = xfrmi6_err,
813 static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
814 .handler = xfrm6_rcv,
815 .cb_handler = xfrmi_rcv_cb,
816 .err_handler = xfrmi6_err,
820 static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
821 .handler = xfrm6_rcv,
822 .cb_handler = xfrmi_rcv_cb,
823 .err_handler = xfrmi6_err,
827 static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
828 .handler = xfrm4_rcv,
829 .input_handler = xfrm_input,
830 .cb_handler = xfrmi_rcv_cb,
831 .err_handler = xfrmi4_err,
835 static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
836 .handler = xfrm4_rcv,
837 .input_handler = xfrm_input,
838 .cb_handler = xfrmi_rcv_cb,
839 .err_handler = xfrmi4_err,
843 static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
844 .handler = xfrm4_rcv,
845 .input_handler = xfrm_input,
846 .cb_handler = xfrmi_rcv_cb,
847 .err_handler = xfrmi4_err,
851 static int __init xfrmi4_init(void)
855 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
857 goto xfrm_proto_esp_failed;
858 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
860 goto xfrm_proto_ah_failed;
861 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
863 goto xfrm_proto_comp_failed;
867 xfrm_proto_comp_failed:
868 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
869 xfrm_proto_ah_failed:
870 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
871 xfrm_proto_esp_failed:
875 static void xfrmi4_fini(void)
877 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
878 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
879 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
882 static int __init xfrmi6_init(void)
886 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
888 goto xfrm_proto_esp_failed;
889 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
891 goto xfrm_proto_ah_failed;
892 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
894 goto xfrm_proto_comp_failed;
898 xfrm_proto_comp_failed:
899 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
900 xfrm_proto_ah_failed:
901 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
902 xfrm_proto_esp_failed:
906 static void xfrmi6_fini(void)
908 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
909 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
910 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
913 static const struct xfrm_if_cb xfrm_if_cb = {
914 .decode_session = xfrmi_decode_session,
917 static int __init xfrmi_init(void)
922 pr_info("IPsec XFRM device driver\n");
924 msg = "tunnel device";
925 err = register_pernet_device(&xfrmi_net_ops);
927 goto pernet_dev_failed;
929 msg = "xfrm4 protocols";
934 msg = "xfrm6 protocols";
940 msg = "netlink interface";
941 err = rtnl_link_register(&xfrmi_link_ops);
943 goto rtnl_link_failed;
945 xfrm_if_register_cb(&xfrm_if_cb);
954 unregister_pernet_device(&xfrmi_net_ops);
956 pr_err("xfrmi init: failed to register %s\n", msg);
960 static void __exit xfrmi_fini(void)
962 xfrm_if_unregister_cb();
963 rtnl_link_unregister(&xfrmi_link_ops);
966 unregister_pernet_device(&xfrmi_net_ops);
969 module_init(xfrmi_init);
970 module_exit(xfrmi_fini);
971 MODULE_LICENSE("GPL");
972 MODULE_ALIAS_RTNL_LINK("xfrm");
973 MODULE_ALIAS_NETDEV("xfrm0");
974 MODULE_AUTHOR("Steffen Klassert");
975 MODULE_DESCRIPTION("XFRM virtual interface");