1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/skbuff.h>
4 #include <linux/socket.h>
5 #include <linux/sysctl.h>
7 #include <linux/module.h>
8 #include <linux/if_arp.h>
9 #include <linux/ipv6.h>
10 #include <linux/mpls.h>
11 #include <linux/netconf.h>
12 #include <linux/nospec.h>
13 #include <linux/vmalloc.h>
14 #include <linux/percpu.h>
19 #include <net/ip_fib.h>
20 #include <net/netevent.h>
21 #include <net/ip_tunnels.h>
22 #include <net/netns/generic.h>
23 #if IS_ENABLED(CONFIG_IPV6)
26 #include <net/ipv6_stubs.h>
30 /* max memory we will use for mpls_route */
31 #define MAX_MPLS_ROUTE_MEM 4096
33 /* Maximum number of labels to look ahead at when selecting a path of
36 #define MAX_MP_SELECT_LABELS 4
38 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
42 static int label_limit = (1 << 20) - 1;
43 static int ttl_max = 255;
45 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
46 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
48 return sizeof(struct mpls_shim_hdr);
51 static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
52 .encap_hlen = ipgre_mpls_encap_hlen,
55 static int ipgre_tunnel_encap_add_mpls_ops(void)
57 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
60 static void ipgre_tunnel_encap_del_mpls_ops(void)
62 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
65 static int ipgre_tunnel_encap_add_mpls_ops(void)
70 static void ipgre_tunnel_encap_del_mpls_ops(void)
75 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
76 struct nlmsghdr *nlh, struct net *net, u32 portid,
77 unsigned int nlm_flags);
79 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
81 struct mpls_route *rt = NULL;
83 if (index < net->mpls.platform_labels) {
84 struct mpls_route __rcu **platform_label =
85 rcu_dereference(net->mpls.platform_label);
86 rt = rcu_dereference(platform_label[index]);
91 bool mpls_output_possible(const struct net_device *dev)
93 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
95 EXPORT_SYMBOL_GPL(mpls_output_possible);
97 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
99 return (u8 *)nh + rt->rt_via_offset;
102 static const u8 *mpls_nh_via(const struct mpls_route *rt,
103 const struct mpls_nh *nh)
105 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
108 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
110 /* The size of the layer 2.5 labels to be added for this route */
111 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
114 unsigned int mpls_dev_mtu(const struct net_device *dev)
116 /* The amount of data the layer 2 frame can hold */
119 EXPORT_SYMBOL_GPL(mpls_dev_mtu);
121 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
126 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
131 EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
133 void mpls_stats_inc_outucastpkts(struct net_device *dev,
134 const struct sk_buff *skb)
136 struct mpls_dev *mdev;
138 if (skb->protocol == htons(ETH_P_MPLS_UC)) {
139 mdev = mpls_dev_get(dev);
141 MPLS_INC_STATS_LEN(mdev, skb->len,
144 } else if (skb->protocol == htons(ETH_P_IP)) {
145 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
146 #if IS_ENABLED(CONFIG_IPV6)
147 } else if (skb->protocol == htons(ETH_P_IPV6)) {
148 struct inet6_dev *in6dev = __in6_dev_get(dev);
151 IP6_UPD_PO_STATS(dev_net(dev), in6dev,
152 IPSTATS_MIB_OUT, skb->len);
156 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
158 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
160 struct mpls_entry_decoded dec;
161 unsigned int mpls_hdr_len = 0;
162 struct mpls_shim_hdr *hdr;
163 bool eli_seen = false;
167 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
169 mpls_hdr_len += sizeof(*hdr);
170 if (!pskb_may_pull(skb, mpls_hdr_len))
173 /* Read and decode the current label */
174 hdr = mpls_hdr(skb) + label_index;
175 dec = mpls_entry_decode(hdr);
177 /* RFC6790 - reserved labels MUST NOT be used as keys
178 * for the load-balancing function
180 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
181 hash = jhash_1word(dec.label, hash);
183 /* The entropy label follows the entropy label
184 * indicator, so this means that the entropy
185 * label was just added to the hash - no need to
186 * go any deeper either in the label stack or in the
191 } else if (dec.label == MPLS_LABEL_ENTROPY) {
198 /* found bottom label; does skb have room for a header? */
199 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) {
200 const struct iphdr *v4hdr;
202 v4hdr = (const struct iphdr *)(hdr + 1);
203 if (v4hdr->version == 4) {
204 hash = jhash_3words(ntohl(v4hdr->saddr),
206 v4hdr->protocol, hash);
207 } else if (v4hdr->version == 6 &&
208 pskb_may_pull(skb, mpls_hdr_len +
209 sizeof(struct ipv6hdr))) {
210 const struct ipv6hdr *v6hdr;
212 v6hdr = (const struct ipv6hdr *)(hdr + 1);
213 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
214 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
215 hash = jhash_1word(v6hdr->nexthdr, hash);
225 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
227 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
230 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for
231 * a next hop (nh->nh_flags) are modified by netdev event handlers.
232 * Since those fields can change at any moment, use READ_ONCE to
235 static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
243 /* No need to look further into packet if there's only
249 alive = READ_ONCE(rt->rt_nhn_alive);
253 hash = mpls_multipath_hash(rt, skb);
254 nh_index = hash % alive;
255 if (alive == rt->rt_nhn)
258 unsigned int nh_flags = READ_ONCE(nh->nh_flags);
260 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
265 } endfor_nexthops(rt);
268 return mpls_get_nexthop(rt, nh_index);
271 static bool mpls_egress(struct net *net, struct mpls_route *rt,
272 struct sk_buff *skb, struct mpls_entry_decoded dec)
274 enum mpls_payload_type payload_type;
275 bool success = false;
277 /* The IPv4 code below accesses through the IPv4 header
278 * checksum, which is 12 bytes into the packet.
279 * The IPv6 code below accesses through the IPv6 hop limit
280 * which is 8 bytes into the packet.
282 * For all supported cases there should always be at least 12
283 * bytes of packet data present. The IPv4 header is 20 bytes
284 * without options and the IPv6 header is always 40 bytes
287 if (!pskb_may_pull(skb, 12))
290 payload_type = rt->rt_payload_type;
291 if (payload_type == MPT_UNSPEC)
292 payload_type = ip_hdr(skb)->version;
294 switch (payload_type) {
296 struct iphdr *hdr4 = ip_hdr(skb);
298 skb->protocol = htons(ETH_P_IP);
300 /* If propagating TTL, take the decremented TTL from
301 * the incoming MPLS header, otherwise decrement the
302 * TTL, but only if not 0 to avoid underflow.
304 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
305 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
306 net->mpls.ip_ttl_propagate))
309 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0;
311 csum_replace2(&hdr4->check,
312 htons(hdr4->ttl << 8),
313 htons(new_ttl << 8));
319 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
320 skb->protocol = htons(ETH_P_IPV6);
322 /* If propagating TTL, take the decremented TTL from
323 * the incoming MPLS header, otherwise decrement the
324 * hop limit, but only if not 0 to avoid underflow.
326 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
327 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
328 net->mpls.ip_ttl_propagate))
329 hdr6->hop_limit = dec.ttl;
330 else if (hdr6->hop_limit)
331 hdr6->hop_limit = hdr6->hop_limit - 1;
336 /* Should have decided which protocol it is by now */
343 static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
344 struct packet_type *pt, struct net_device *orig_dev)
346 struct net *net = dev_net(dev);
347 struct mpls_shim_hdr *hdr;
348 struct mpls_route *rt;
350 struct mpls_entry_decoded dec;
351 struct net_device *out_dev;
352 struct mpls_dev *out_mdev;
353 struct mpls_dev *mdev;
355 unsigned int new_header_size;
359 /* Careful this entire function runs inside of an rcu critical section */
361 mdev = mpls_dev_get(dev);
365 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets,
368 if (!mdev->input_enabled) {
369 MPLS_INC_STATS(mdev, rx_dropped);
373 if (skb->pkt_type != PACKET_HOST)
376 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
379 if (!pskb_may_pull(skb, sizeof(*hdr)))
382 /* Read and decode the label */
384 dec = mpls_entry_decode(hdr);
386 rt = mpls_route_input_rcu(net, dec.label);
388 MPLS_INC_STATS(mdev, rx_noroute);
392 nh = mpls_select_multipath(rt, skb);
397 skb_pull(skb, sizeof(*hdr));
398 skb_reset_network_header(skb);
402 if (skb_warn_if_lro(skb))
405 skb_forward_csum(skb);
407 /* Verify ttl is valid */
412 /* Find the output device */
413 out_dev = rcu_dereference(nh->nh_dev);
414 if (!mpls_output_possible(out_dev))
417 /* Verify the destination can hold the packet */
418 new_header_size = mpls_nh_header_size(nh);
419 mtu = mpls_dev_mtu(out_dev);
420 if (mpls_pkt_too_big(skb, mtu - new_header_size))
423 hh_len = LL_RESERVED_SPACE(out_dev);
424 if (!out_dev->header_ops)
427 /* Ensure there is enough space for the headers in the skb */
428 if (skb_cow(skb, hh_len + new_header_size))
432 skb->protocol = htons(ETH_P_MPLS_UC);
434 if (unlikely(!new_header_size && dec.bos)) {
435 /* Penultimate hop popping */
436 if (!mpls_egress(dev_net(out_dev), rt, skb, dec))
441 skb_push(skb, new_header_size);
442 skb_reset_network_header(skb);
443 /* Push the new labels */
446 for (i = nh->nh_labels - 1; i >= 0; i--) {
447 hdr[i] = mpls_entry_encode(nh->nh_label[i],
453 mpls_stats_inc_outucastpkts(out_dev, skb);
455 /* If via wasn't specified then send out using device address */
456 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
457 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
458 out_dev->dev_addr, skb);
460 err = neigh_xmit(nh->nh_via_table, out_dev,
461 mpls_nh_via(rt, nh), skb);
463 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
468 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
470 MPLS_INC_STATS(out_mdev, tx_errors);
473 MPLS_INC_STATS(mdev, rx_errors);
479 static struct packet_type mpls_packet_type __read_mostly = {
480 .type = cpu_to_be16(ETH_P_MPLS_UC),
481 .func = mpls_forward,
484 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
485 [RTA_DST] = { .type = NLA_U32 },
486 [RTA_OIF] = { .type = NLA_U32 },
487 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
490 struct mpls_route_config {
495 u8 rc_via[MAX_VIA_ALEN];
499 u32 rc_output_label[MAX_NEW_LABELS];
501 enum mpls_payload_type rc_payload_type;
502 struct nl_info rc_nlinfo;
503 struct rtnexthop *rc_mp;
507 /* all nexthops within a route have the same size based on max
508 * number of labels and max via length for a hop
510 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
512 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
513 struct mpls_route *rt;
516 size = sizeof(*rt) + num_nh * nh_size;
517 if (size > MAX_MPLS_ROUTE_MEM)
518 return ERR_PTR(-EINVAL);
520 rt = kzalloc(size, GFP_KERNEL);
522 return ERR_PTR(-ENOMEM);
525 rt->rt_nhn_alive = num_nh;
526 rt->rt_nh_size = nh_size;
527 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels);
532 static void mpls_rt_free(struct mpls_route *rt)
535 kfree_rcu(rt, rt_rcu);
538 static void mpls_notify_route(struct net *net, unsigned index,
539 struct mpls_route *old, struct mpls_route *new,
540 const struct nl_info *info)
542 struct nlmsghdr *nlh = info ? info->nlh : NULL;
543 unsigned portid = info ? info->portid : 0;
544 int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
545 struct mpls_route *rt = new ? new : old;
546 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
547 /* Ignore reserved labels for now */
548 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
549 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
552 static void mpls_route_update(struct net *net, unsigned index,
553 struct mpls_route *new,
554 const struct nl_info *info)
556 struct mpls_route __rcu **platform_label;
557 struct mpls_route *rt;
561 platform_label = rtnl_dereference(net->mpls.platform_label);
562 rt = rtnl_dereference(platform_label[index]);
563 rcu_assign_pointer(platform_label[index], new);
565 mpls_notify_route(net, index, rt, new, info);
567 /* If we removed a route free it now */
571 static unsigned find_free_label(struct net *net)
573 struct mpls_route __rcu **platform_label;
574 size_t platform_labels;
577 platform_label = rtnl_dereference(net->mpls.platform_label);
578 platform_labels = net->mpls.platform_labels;
579 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
581 if (!rtnl_dereference(platform_label[index]))
584 return LABEL_NOT_SPECIFIED;
587 #if IS_ENABLED(CONFIG_INET)
588 static struct net_device *inet_fib_lookup_dev(struct net *net,
591 struct net_device *dev;
593 struct in_addr daddr;
595 memcpy(&daddr, addr, sizeof(struct in_addr));
596 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
608 static struct net_device *inet_fib_lookup_dev(struct net *net,
611 return ERR_PTR(-EAFNOSUPPORT);
615 #if IS_ENABLED(CONFIG_IPV6)
616 static struct net_device *inet6_fib_lookup_dev(struct net *net,
619 struct net_device *dev;
620 struct dst_entry *dst;
625 return ERR_PTR(-EAFNOSUPPORT);
627 memset(&fl6, 0, sizeof(fl6));
628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
629 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
640 static struct net_device *inet6_fib_lookup_dev(struct net *net,
643 return ERR_PTR(-EAFNOSUPPORT);
647 static struct net_device *find_outdev(struct net *net,
648 struct mpls_route *rt,
649 struct mpls_nh *nh, int oif)
651 struct net_device *dev = NULL;
654 switch (nh->nh_via_table) {
655 case NEIGH_ARP_TABLE:
656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
661 case NEIGH_LINK_TABLE:
665 dev = dev_get_by_index(net, oif);
669 return ERR_PTR(-ENODEV);
674 /* The caller is holding rtnl anyways, so release the dev reference */
680 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
681 struct mpls_nh *nh, int oif)
683 struct net_device *dev = NULL;
686 dev = find_outdev(net, rt, nh, oif);
693 /* Ensure this is a supported device */
695 if (!mpls_dev_get(dev))
698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
699 (dev->addr_len != nh->nh_via_alen))
702 RCU_INIT_POINTER(nh->nh_dev, dev);
704 if (!(dev->flags & IFF_UP)) {
705 nh->nh_flags |= RTNH_F_DEAD;
709 flags = dev_get_flags(dev);
710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
711 nh->nh_flags |= RTNH_F_LINKDOWN;
720 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
721 u8 via_addr[], struct netlink_ext_ack *extack)
723 struct rtvia *via = nla_data(nla);
727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
728 NL_SET_ERR_MSG_ATTR(extack, nla,
729 "Invalid attribute length for RTA_VIA");
732 alen = nla_len(nla) -
733 offsetof(struct rtvia, rtvia_addr);
734 if (alen > MAX_VIA_ALEN) {
735 NL_SET_ERR_MSG_ATTR(extack, nla,
736 "Invalid address length for RTA_VIA");
740 /* Validate the address family */
741 switch (via->rtvia_family) {
743 *via_table = NEIGH_LINK_TABLE;
746 *via_table = NEIGH_ARP_TABLE;
751 *via_table = NEIGH_ND_TABLE;
756 /* Unsupported address family */
760 memcpy(via_addr, via->rtvia_addr, alen);
768 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
769 struct mpls_route *rt)
771 struct net *net = cfg->rc_nlinfo.nl_net;
772 struct mpls_nh *nh = rt->rt_nh;
779 nh->nh_labels = cfg->rc_output_labels;
780 for (i = 0; i < nh->nh_labels; i++)
781 nh->nh_label[i] = cfg->rc_output_label[i];
783 nh->nh_via_table = cfg->rc_via_table;
784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
785 nh->nh_via_alen = cfg->rc_via_alen;
787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
800 static int mpls_nh_build(struct net *net, struct mpls_route *rt,
801 struct mpls_nh *nh, int oif, struct nlattr *via,
802 struct nlattr *newdst, u8 max_labels,
803 struct netlink_ext_ack *extack)
811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
812 nh->nh_label, extack);
818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
819 __mpls_nh_via(rt, nh), extack);
823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
826 err = mpls_nh_assign_dev(net, rt, nh, oif);
836 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
837 u8 cfg_via_alen, u8 *max_via_alen,
846 while (rtnh_ok(rtnh, remaining)) {
847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
851 attrlen = rtnh_attrlen(rtnh);
852 nla = nla_find(attrs, attrlen, RTA_VIA);
853 if (nla && nla_len(nla) >=
854 offsetof(struct rtvia, rtvia_addr)) {
855 int via_alen = nla_len(nla) -
856 offsetof(struct rtvia, rtvia_addr);
858 if (via_alen <= MAX_VIA_ALEN)
859 *max_via_alen = max_t(u16, *max_via_alen,
863 nla = nla_find(attrs, attrlen, RTA_NEWDST);
865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
869 *max_labels = max_t(u8, *max_labels, n_labels);
871 /* number of nexthops is tracked by a u8.
872 * Check for overflow.
878 rtnh = rtnh_next(rtnh, &remaining);
881 /* leftover implies invalid nexthop configuration, discard it */
882 return remaining > 0 ? 0 : nhs;
885 static int mpls_nh_build_multi(struct mpls_route_config *cfg,
886 struct mpls_route *rt, u8 max_labels,
887 struct netlink_ext_ack *extack)
889 struct rtnexthop *rtnh = cfg->rc_mp;
890 struct nlattr *nla_via, *nla_newdst;
891 int remaining = cfg->rc_mp_len;
895 change_nexthops(rt) {
902 if (!rtnh_ok(rtnh, remaining))
905 /* neither weighted multipath nor any flags
908 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
911 attrlen = rtnh_attrlen(rtnh);
913 struct nlattr *attrs = rtnh_attrs(rtnh);
915 nla_via = nla_find(attrs, attrlen, RTA_VIA);
916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
920 rtnh->rtnh_ifindex, nla_via, nla_newdst,
925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
928 rtnh = rtnh_next(rtnh, &remaining);
930 } endfor_nexthops(rt);
940 static bool mpls_label_ok(struct net *net, unsigned int *index,
941 struct netlink_ext_ack *extack)
945 /* Reserved labels may not be set */
946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
947 NL_SET_ERR_MSG(extack,
948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
952 /* The full 20 bit range may not be supported. */
953 if (is_ok && *index >= net->mpls.platform_labels) {
954 NL_SET_ERR_MSG(extack,
955 "Label >= configured maximum in platform_labels");
959 *index = array_index_nospec(*index, net->mpls.platform_labels);
963 static int mpls_route_add(struct mpls_route_config *cfg,
964 struct netlink_ext_ack *extack)
966 struct mpls_route __rcu **platform_label;
967 struct net *net = cfg->rc_nlinfo.nl_net;
968 struct mpls_route *rt, *old;
975 index = cfg->rc_label;
977 /* If a label was not specified during insert pick one */
978 if ((index == LABEL_NOT_SPECIFIED) &&
979 (cfg->rc_nlflags & NLM_F_CREATE)) {
980 index = find_free_label(net);
983 if (!mpls_label_ok(net, &index, extack))
986 /* Append makes no sense with mpls */
988 if (cfg->rc_nlflags & NLM_F_APPEND) {
989 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
994 platform_label = rtnl_dereference(net->mpls.platform_label);
995 old = rtnl_dereference(platform_label[index]);
996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1010 cfg->rc_via_alen, &max_via_alen,
1013 max_via_alen = cfg->rc_via_alen;
1014 max_labels = cfg->rc_output_labels;
1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
1024 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1030 rt->rt_protocol = cfg->rc_protocol;
1031 rt->rt_payload_type = cfg->rc_payload_type;
1032 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1035 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1037 err = mpls_nh_build_from_cfg(cfg, rt);
1041 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1051 static int mpls_route_del(struct mpls_route_config *cfg,
1052 struct netlink_ext_ack *extack)
1054 struct net *net = cfg->rc_nlinfo.nl_net;
1058 index = cfg->rc_label;
1060 if (!mpls_label_ok(net, &index, extack))
1063 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1070 static void mpls_get_stats(struct mpls_dev *mdev,
1071 struct mpls_link_stats *stats)
1073 struct mpls_pcpu_stats *p;
1076 memset(stats, 0, sizeof(*stats));
1078 for_each_possible_cpu(i) {
1079 struct mpls_link_stats local;
1082 p = per_cpu_ptr(mdev->stats, i);
1084 start = u64_stats_fetch_begin(&p->syncp);
1086 } while (u64_stats_fetch_retry(&p->syncp, start));
1088 stats->rx_packets += local.rx_packets;
1089 stats->rx_bytes += local.rx_bytes;
1090 stats->tx_packets += local.tx_packets;
1091 stats->tx_bytes += local.tx_bytes;
1092 stats->rx_errors += local.rx_errors;
1093 stats->tx_errors += local.tx_errors;
1094 stats->rx_dropped += local.rx_dropped;
1095 stats->tx_dropped += local.tx_dropped;
1096 stats->rx_noroute += local.rx_noroute;
1100 static int mpls_fill_stats_af(struct sk_buff *skb,
1101 const struct net_device *dev)
1103 struct mpls_link_stats *stats;
1104 struct mpls_dev *mdev;
1107 mdev = mpls_dev_get(dev);
1111 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1112 sizeof(struct mpls_link_stats),
1117 stats = nla_data(nla);
1118 mpls_get_stats(mdev, stats);
1123 static size_t mpls_get_stats_af_size(const struct net_device *dev)
1125 struct mpls_dev *mdev;
1127 mdev = mpls_dev_get(dev);
1131 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1134 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1135 u32 portid, u32 seq, int event,
1136 unsigned int flags, int type)
1138 struct nlmsghdr *nlh;
1139 struct netconfmsg *ncm;
1142 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1147 if (type == NETCONFA_ALL)
1150 ncm = nlmsg_data(nlh);
1151 ncm->ncm_family = AF_MPLS;
1153 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1154 goto nla_put_failure;
1156 if ((all || type == NETCONFA_INPUT) &&
1157 nla_put_s32(skb, NETCONFA_INPUT,
1158 mdev->input_enabled) < 0)
1159 goto nla_put_failure;
1161 nlmsg_end(skb, nlh);
1165 nlmsg_cancel(skb, nlh);
1169 static int mpls_netconf_msgsize_devconf(int type)
1171 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1172 + nla_total_size(4); /* NETCONFA_IFINDEX */
1175 if (type == NETCONFA_ALL)
1178 if (all || type == NETCONFA_INPUT)
1179 size += nla_total_size(4);
1184 static void mpls_netconf_notify_devconf(struct net *net, int event,
1185 int type, struct mpls_dev *mdev)
1187 struct sk_buff *skb;
1190 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1194 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1196 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1197 WARN_ON(err == -EMSGSIZE);
1202 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1206 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1209 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1210 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1213 static int mpls_netconf_valid_get_req(struct sk_buff *skb,
1214 const struct nlmsghdr *nlh,
1216 struct netlink_ext_ack *extack)
1220 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
1221 NL_SET_ERR_MSG_MOD(extack,
1222 "Invalid header for netconf get request");
1226 if (!netlink_strict_get_check(skb))
1227 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
1229 devconf_mpls_policy, extack);
1231 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
1233 devconf_mpls_policy, extack);
1237 for (i = 0; i <= NETCONFA_MAX; i++) {
1242 case NETCONFA_IFINDEX:
1245 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
1253 static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1254 struct nlmsghdr *nlh,
1255 struct netlink_ext_ack *extack)
1257 struct net *net = sock_net(in_skb->sk);
1258 struct nlattr *tb[NETCONFA_MAX + 1];
1259 struct net_device *dev;
1260 struct mpls_dev *mdev;
1261 struct sk_buff *skb;
1265 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
1270 if (!tb[NETCONFA_IFINDEX])
1273 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1274 dev = __dev_get_by_index(net, ifindex);
1278 mdev = mpls_dev_get(dev);
1283 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1287 err = mpls_netconf_fill_devconf(skb, mdev,
1288 NETLINK_CB(in_skb).portid,
1289 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1292 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1293 WARN_ON(err == -EMSGSIZE);
1297 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1302 static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1303 struct netlink_callback *cb)
1305 const struct nlmsghdr *nlh = cb->nlh;
1306 struct net *net = sock_net(skb->sk);
1307 struct hlist_head *head;
1308 struct net_device *dev;
1309 struct mpls_dev *mdev;
1313 if (cb->strict_check) {
1314 struct netlink_ext_ack *extack = cb->extack;
1315 struct netconfmsg *ncm;
1317 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1318 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1322 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1323 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1329 s_idx = idx = cb->args[1];
1331 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1333 head = &net->dev_index_head[h];
1335 cb->seq = net->dev_base_seq;
1336 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1339 mdev = mpls_dev_get(dev);
1342 if (mpls_netconf_fill_devconf(skb, mdev,
1343 NETLINK_CB(cb->skb).portid,
1347 NETCONFA_ALL) < 0) {
1351 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1364 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1365 (&((struct mpls_dev *)0)->field)
1367 static int mpls_conf_proc(struct ctl_table *ctl, int write,
1368 void __user *buffer,
1369 size_t *lenp, loff_t *ppos)
1371 int oval = *(int *)ctl->data;
1372 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1375 struct mpls_dev *mdev = ctl->extra1;
1376 int i = (int *)ctl->data - (int *)mdev;
1377 struct net *net = ctl->extra2;
1378 int val = *(int *)ctl->data;
1380 if (i == offsetof(struct mpls_dev, input_enabled) &&
1382 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1383 NETCONFA_INPUT, mdev);
1390 static const struct ctl_table mpls_dev_table[] = {
1392 .procname = "input",
1393 .maxlen = sizeof(int),
1395 .proc_handler = mpls_conf_proc,
1396 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1401 static int mpls_dev_sysctl_register(struct net_device *dev,
1402 struct mpls_dev *mdev)
1404 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1405 struct net *net = dev_net(dev);
1406 struct ctl_table *table;
1409 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1413 /* Table data contains only offsets relative to the base of
1414 * the mdev at this point, so make them absolute.
1416 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
1417 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1418 table[i].extra1 = mdev;
1419 table[i].extra2 = net;
1422 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1424 mdev->sysctl = register_net_sysctl(net, path, table);
1428 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1437 static void mpls_dev_sysctl_unregister(struct net_device *dev,
1438 struct mpls_dev *mdev)
1440 struct net *net = dev_net(dev);
1441 struct ctl_table *table;
1443 table = mdev->sysctl->ctl_table_arg;
1444 unregister_net_sysctl_table(mdev->sysctl);
1447 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1450 static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1452 struct mpls_dev *mdev;
1458 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1460 return ERR_PTR(err);
1462 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1466 for_each_possible_cpu(i) {
1467 struct mpls_pcpu_stats *mpls_stats;
1469 mpls_stats = per_cpu_ptr(mdev->stats, i);
1470 u64_stats_init(&mpls_stats->syncp);
1475 err = mpls_dev_sysctl_register(dev, mdev);
1479 rcu_assign_pointer(dev->mpls_ptr, mdev);
1484 free_percpu(mdev->stats);
1486 return ERR_PTR(err);
1489 static void mpls_dev_destroy_rcu(struct rcu_head *head)
1491 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1493 free_percpu(mdev->stats);
1497 static void mpls_ifdown(struct net_device *dev, int event)
1499 struct mpls_route __rcu **platform_label;
1500 struct net *net = dev_net(dev);
1504 platform_label = rtnl_dereference(net->mpls.platform_label);
1505 for (index = 0; index < net->mpls.platform_labels; index++) {
1506 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1513 change_nexthops(rt) {
1514 unsigned int nh_flags = nh->nh_flags;
1516 if (rtnl_dereference(nh->nh_dev) != dev)
1521 case NETDEV_UNREGISTER:
1522 nh_flags |= RTNH_F_DEAD;
1525 nh_flags |= RTNH_F_LINKDOWN;
1528 if (event == NETDEV_UNREGISTER)
1529 RCU_INIT_POINTER(nh->nh_dev, NULL);
1531 if (nh->nh_flags != nh_flags)
1532 WRITE_ONCE(nh->nh_flags, nh_flags);
1534 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1536 if (!rtnl_dereference(nh->nh_dev))
1538 } endfor_nexthops(rt);
1540 WRITE_ONCE(rt->rt_nhn_alive, alive);
1542 /* if there are no more nexthops, delete the route */
1543 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
1544 mpls_route_update(net, index, NULL, NULL);
1548 static void mpls_ifup(struct net_device *dev, unsigned int flags)
1550 struct mpls_route __rcu **platform_label;
1551 struct net *net = dev_net(dev);
1555 platform_label = rtnl_dereference(net->mpls.platform_label);
1556 for (index = 0; index < net->mpls.platform_labels; index++) {
1557 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1563 change_nexthops(rt) {
1564 unsigned int nh_flags = nh->nh_flags;
1565 struct net_device *nh_dev =
1566 rtnl_dereference(nh->nh_dev);
1568 if (!(nh_flags & flags)) {
1576 WRITE_ONCE(nh->nh_flags, nh_flags);
1577 } endfor_nexthops(rt);
1579 WRITE_ONCE(rt->rt_nhn_alive, alive);
1583 static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1586 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1587 struct mpls_dev *mdev;
1590 if (event == NETDEV_REGISTER) {
1592 /* For now just support Ethernet, IPGRE, IP6GRE, SIT and
1595 if (dev->type == ARPHRD_ETHER ||
1596 dev->type == ARPHRD_LOOPBACK ||
1597 dev->type == ARPHRD_IPGRE ||
1598 dev->type == ARPHRD_IP6GRE ||
1599 dev->type == ARPHRD_SIT ||
1600 dev->type == ARPHRD_TUNNEL) {
1601 mdev = mpls_add_dev(dev);
1603 return notifier_from_errno(PTR_ERR(mdev));
1608 mdev = mpls_dev_get(dev);
1614 mpls_ifdown(dev, event);
1617 flags = dev_get_flags(dev);
1618 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1619 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1621 mpls_ifup(dev, RTNH_F_DEAD);
1624 flags = dev_get_flags(dev);
1625 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1626 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1628 mpls_ifdown(dev, event);
1630 case NETDEV_UNREGISTER:
1631 mpls_ifdown(dev, event);
1632 mdev = mpls_dev_get(dev);
1634 mpls_dev_sysctl_unregister(dev, mdev);
1635 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1636 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1639 case NETDEV_CHANGENAME:
1640 mdev = mpls_dev_get(dev);
1644 mpls_dev_sysctl_unregister(dev, mdev);
1645 err = mpls_dev_sysctl_register(dev, mdev);
1647 return notifier_from_errno(err);
1654 static struct notifier_block mpls_dev_notifier = {
1655 .notifier_call = mpls_dev_notify,
1658 static int nla_put_via(struct sk_buff *skb,
1659 u8 table, const void *addr, int alen)
1661 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1662 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1666 int family = AF_UNSPEC;
1668 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1672 if (table <= NEIGH_NR_TABLES)
1673 family = table_to_family[table];
1675 via = nla_data(nla);
1676 via->rtvia_family = family;
1677 memcpy(via->rtvia_addr, addr, alen);
1681 int nla_put_labels(struct sk_buff *skb, int attrtype,
1682 u8 labels, const u32 label[])
1685 struct mpls_shim_hdr *nla_label;
1688 nla = nla_reserve(skb, attrtype, labels*4);
1692 nla_label = nla_data(nla);
1694 for (i = labels - 1; i >= 0; i--) {
1695 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1701 EXPORT_SYMBOL_GPL(nla_put_labels);
1703 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1704 u32 label[], struct netlink_ext_ack *extack)
1706 unsigned len = nla_len(nla);
1707 struct mpls_shim_hdr *nla_label;
1712 /* len needs to be an even multiple of 4 (the label size). Number
1713 * of labels is a u8 so check for overflow.
1715 if (len & 3 || len / 4 > 255) {
1716 NL_SET_ERR_MSG_ATTR(extack, nla,
1717 "Invalid length for labels attribute");
1721 /* Limit the number of new labels allowed */
1723 if (nla_labels > max_labels) {
1724 NL_SET_ERR_MSG(extack, "Too many labels");
1728 /* when label == NULL, caller wants number of labels */
1732 nla_label = nla_data(nla);
1734 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1735 struct mpls_entry_decoded dec;
1736 dec = mpls_entry_decode(nla_label + i);
1738 /* Ensure the bottom of stack flag is properly set
1739 * and ttl and tc are both clear.
1742 NL_SET_ERR_MSG_ATTR(extack, nla,
1743 "TTL in label must be 0");
1748 NL_SET_ERR_MSG_ATTR(extack, nla,
1749 "Traffic class in label must be 0");
1753 if (dec.bos != bos) {
1754 NL_SET_BAD_ATTR(extack, nla);
1756 NL_SET_ERR_MSG(extack,
1757 "BOS bit must be set in first label");
1759 NL_SET_ERR_MSG(extack,
1760 "BOS bit can only be set in first label");
1765 switch (dec.label) {
1766 case MPLS_LABEL_IMPLNULL:
1767 /* RFC3032: This is a label that an LSR may
1768 * assign and distribute, but which never
1769 * actually appears in the encapsulation.
1771 NL_SET_ERR_MSG_ATTR(extack, nla,
1772 "Implicit NULL Label (3) can not be used in encapsulation");
1776 label[i] = dec.label;
1779 *labels = nla_labels;
1782 EXPORT_SYMBOL_GPL(nla_get_labels);
1784 static int rtm_to_route_config(struct sk_buff *skb,
1785 struct nlmsghdr *nlh,
1786 struct mpls_route_config *cfg,
1787 struct netlink_ext_ack *extack)
1790 struct nlattr *tb[RTA_MAX+1];
1794 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1795 rtm_mpls_policy, extack);
1800 rtm = nlmsg_data(nlh);
1802 if (rtm->rtm_family != AF_MPLS) {
1803 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1806 if (rtm->rtm_dst_len != 20) {
1807 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1810 if (rtm->rtm_src_len != 0) {
1811 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1814 if (rtm->rtm_tos != 0) {
1815 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1818 if (rtm->rtm_table != RT_TABLE_MAIN) {
1819 NL_SET_ERR_MSG(extack,
1820 "MPLS only supports the main route table");
1823 /* Any value is acceptable for rtm_protocol */
1825 /* As mpls uses destination specific addresses
1826 * (or source specific address in the case of multicast)
1827 * all addresses have universal scope.
1829 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1830 NL_SET_ERR_MSG(extack,
1831 "Invalid route scope - MPLS only supports UNIVERSE");
1834 if (rtm->rtm_type != RTN_UNICAST) {
1835 NL_SET_ERR_MSG(extack,
1836 "Invalid route type - MPLS only supports UNICAST");
1839 if (rtm->rtm_flags != 0) {
1840 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1844 cfg->rc_label = LABEL_NOT_SPECIFIED;
1845 cfg->rc_protocol = rtm->rtm_protocol;
1846 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1847 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1848 cfg->rc_nlflags = nlh->nlmsg_flags;
1849 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1850 cfg->rc_nlinfo.nlh = nlh;
1851 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1853 for (index = 0; index <= RTA_MAX; index++) {
1854 struct nlattr *nla = tb[index];
1860 cfg->rc_ifindex = nla_get_u32(nla);
1863 if (nla_get_labels(nla, MAX_NEW_LABELS,
1864 &cfg->rc_output_labels,
1865 cfg->rc_output_label, extack))
1871 if (nla_get_labels(nla, 1, &label_count,
1872 &cfg->rc_label, extack))
1875 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1876 &cfg->rc_label, extack))
1881 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
1885 if (nla_get_via(nla, &cfg->rc_via_alen,
1886 &cfg->rc_via_table, cfg->rc_via,
1893 cfg->rc_mp = nla_data(nla);
1894 cfg->rc_mp_len = nla_len(nla);
1897 case RTA_TTL_PROPAGATE:
1899 u8 ttl_propagate = nla_get_u8(nla);
1901 if (ttl_propagate > 1) {
1902 NL_SET_ERR_MSG_ATTR(extack, nla,
1903 "RTA_TTL_PROPAGATE can only be 0 or 1");
1906 cfg->rc_ttl_propagate = ttl_propagate ?
1907 MPLS_TTL_PROP_ENABLED :
1908 MPLS_TTL_PROP_DISABLED;
1912 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1913 /* Unsupported attribute */
1923 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1924 struct netlink_ext_ack *extack)
1926 struct mpls_route_config *cfg;
1929 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1933 err = rtm_to_route_config(skb, nlh, cfg, extack);
1937 err = mpls_route_del(cfg, extack);
1945 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1946 struct netlink_ext_ack *extack)
1948 struct mpls_route_config *cfg;
1951 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1955 err = rtm_to_route_config(skb, nlh, cfg, extack);
1959 err = mpls_route_add(cfg, extack);
1966 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1967 u32 label, struct mpls_route *rt, int flags)
1969 struct net_device *dev;
1970 struct nlmsghdr *nlh;
1973 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1977 rtm = nlmsg_data(nlh);
1978 rtm->rtm_family = AF_MPLS;
1979 rtm->rtm_dst_len = 20;
1980 rtm->rtm_src_len = 0;
1982 rtm->rtm_table = RT_TABLE_MAIN;
1983 rtm->rtm_protocol = rt->rt_protocol;
1984 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1985 rtm->rtm_type = RTN_UNICAST;
1988 if (nla_put_labels(skb, RTA_DST, 1, &label))
1989 goto nla_put_failure;
1991 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1992 bool ttl_propagate =
1993 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1995 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
1997 goto nla_put_failure;
1999 if (rt->rt_nhn == 1) {
2000 const struct mpls_nh *nh = rt->rt_nh;
2002 if (nh->nh_labels &&
2003 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2005 goto nla_put_failure;
2006 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2007 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2009 goto nla_put_failure;
2010 dev = rtnl_dereference(nh->nh_dev);
2011 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2012 goto nla_put_failure;
2013 if (nh->nh_flags & RTNH_F_LINKDOWN)
2014 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2015 if (nh->nh_flags & RTNH_F_DEAD)
2016 rtm->rtm_flags |= RTNH_F_DEAD;
2018 struct rtnexthop *rtnh;
2023 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
2025 goto nla_put_failure;
2028 dev = rtnl_dereference(nh->nh_dev);
2032 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
2034 goto nla_put_failure;
2036 rtnh->rtnh_ifindex = dev->ifindex;
2037 if (nh->nh_flags & RTNH_F_LINKDOWN) {
2038 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
2041 if (nh->nh_flags & RTNH_F_DEAD) {
2042 rtnh->rtnh_flags |= RTNH_F_DEAD;
2046 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2049 goto nla_put_failure;
2050 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2051 nla_put_via(skb, nh->nh_via_table,
2052 mpls_nh_via(rt, nh),
2054 goto nla_put_failure;
2056 /* length of rtnetlink header + attributes */
2057 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2058 } endfor_nexthops(rt);
2060 if (linkdown == rt->rt_nhn)
2061 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2062 if (dead == rt->rt_nhn)
2063 rtm->rtm_flags |= RTNH_F_DEAD;
2065 nla_nest_end(skb, mp);
2068 nlmsg_end(skb, nlh);
2072 nlmsg_cancel(skb, nlh);
2076 #if IS_ENABLED(CONFIG_INET)
2077 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2078 struct fib_dump_filter *filter,
2079 struct netlink_callback *cb)
2081 return ip_valid_fib_dump_req(net, nlh, filter, cb);
2084 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2085 struct fib_dump_filter *filter,
2086 struct netlink_callback *cb)
2088 struct netlink_ext_ack *extack = cb->extack;
2089 struct nlattr *tb[RTA_MAX + 1];
2093 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2094 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2098 rtm = nlmsg_data(nlh);
2099 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
2100 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2102 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2106 if (rtm->rtm_protocol) {
2107 filter->protocol = rtm->rtm_protocol;
2108 filter->filter_set = 1;
2109 cb->answer_flags = NLM_F_DUMP_FILTERED;
2112 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2113 rtm_mpls_policy, extack);
2117 for (i = 0; i <= RTA_MAX; ++i) {
2121 ifindex = nla_get_u32(tb[i]);
2122 filter->dev = __dev_get_by_index(net, ifindex);
2125 filter->filter_set = 1;
2127 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2136 static bool mpls_rt_uses_dev(struct mpls_route *rt,
2137 const struct net_device *dev)
2139 struct net_device *nh_dev;
2141 if (rt->rt_nhn == 1) {
2142 struct mpls_nh *nh = rt->rt_nh;
2144 nh_dev = rtnl_dereference(nh->nh_dev);
2149 nh_dev = rtnl_dereference(nh->nh_dev);
2152 } endfor_nexthops(rt);
2158 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2160 const struct nlmsghdr *nlh = cb->nlh;
2161 struct net *net = sock_net(skb->sk);
2162 struct mpls_route __rcu **platform_label;
2163 struct fib_dump_filter filter = {};
2164 unsigned int flags = NLM_F_MULTI;
2165 size_t platform_labels;
2170 if (cb->strict_check) {
2173 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
2177 /* for MPLS, there is only 1 table with fixed type and flags.
2178 * If either are set in the filter then return nothing.
2180 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2181 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2186 index = cb->args[0];
2187 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2188 index = MPLS_LABEL_FIRST_UNRESERVED;
2190 platform_label = rtnl_dereference(net->mpls.platform_label);
2191 platform_labels = net->mpls.platform_labels;
2193 if (filter.filter_set)
2194 flags |= NLM_F_DUMP_FILTERED;
2196 for (; index < platform_labels; index++) {
2197 struct mpls_route *rt;
2199 rt = rtnl_dereference(platform_label[index]);
2203 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2204 (filter.protocol && rt->rt_protocol != filter.protocol))
2207 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2208 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2209 index, rt, flags) < 0)
2212 cb->args[0] = index;
2217 static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2220 NLMSG_ALIGN(sizeof(struct rtmsg))
2221 + nla_total_size(4) /* RTA_DST */
2222 + nla_total_size(1); /* RTA_TTL_PROPAGATE */
2224 if (rt->rt_nhn == 1) {
2225 struct mpls_nh *nh = rt->rt_nh;
2228 payload += nla_total_size(4); /* RTA_OIF */
2229 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
2230 payload += nla_total_size(2 + nh->nh_via_alen);
2231 if (nh->nh_labels) /* RTA_NEWDST */
2232 payload += nla_total_size(nh->nh_labels * 4);
2234 /* each nexthop is packed in an attribute */
2238 if (!rtnl_dereference(nh->nh_dev))
2240 nhsize += nla_total_size(sizeof(struct rtnexthop));
2242 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2243 nhsize += nla_total_size(2 + nh->nh_via_alen);
2245 nhsize += nla_total_size(nh->nh_labels * 4);
2246 } endfor_nexthops(rt);
2247 /* nested attribute */
2248 payload += nla_total_size(nhsize);
2254 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2255 struct nlmsghdr *nlh, struct net *net, u32 portid,
2256 unsigned int nlm_flags)
2258 struct sk_buff *skb;
2259 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2262 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2266 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2268 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2269 WARN_ON(err == -EMSGSIZE);
2273 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2278 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2281 static int mpls_valid_getroute_req(struct sk_buff *skb,
2282 const struct nlmsghdr *nlh,
2284 struct netlink_ext_ack *extack)
2289 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2290 NL_SET_ERR_MSG_MOD(extack,
2291 "Invalid header for get route request");
2295 if (!netlink_strict_get_check(skb))
2296 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2297 rtm_mpls_policy, extack);
2299 rtm = nlmsg_data(nlh);
2300 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
2301 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
2302 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
2303 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
2306 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
2307 NL_SET_ERR_MSG_MOD(extack,
2308 "Invalid flags for get route request");
2312 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2313 rtm_mpls_policy, extack);
2317 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
2318 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
2322 for (i = 0; i <= RTA_MAX; i++) {
2331 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
2339 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2340 struct netlink_ext_ack *extack)
2342 struct net *net = sock_net(in_skb->sk);
2343 u32 portid = NETLINK_CB(in_skb).portid;
2344 u32 in_label = LABEL_NOT_SPECIFIED;
2345 struct nlattr *tb[RTA_MAX + 1];
2346 u32 labels[MAX_NEW_LABELS];
2347 struct mpls_shim_hdr *hdr;
2348 unsigned int hdr_size = 0;
2349 struct net_device *dev;
2350 struct mpls_route *rt;
2351 struct rtmsg *rtm, *r;
2352 struct nlmsghdr *nlh;
2353 struct sk_buff *skb;
2358 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack);
2362 rtm = nlmsg_data(in_nlh);
2367 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2368 &in_label, extack)) {
2373 if (!mpls_label_ok(net, &in_label, extack)) {
2379 rt = mpls_route_input_rcu(net, in_label);
2385 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2386 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2392 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2393 RTM_NEWROUTE, in_label, rt, 0);
2395 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2396 WARN_ON(err == -EMSGSIZE);
2400 return rtnl_unicast(skb, net, portid);
2403 if (tb[RTA_NEWDST]) {
2404 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2405 labels, extack) != 0) {
2410 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2413 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2419 skb->protocol = htons(ETH_P_MPLS_UC);
2425 if (skb_cow(skb, hdr_size)) {
2430 skb_reserve(skb, hdr_size);
2431 skb_push(skb, hdr_size);
2432 skb_reset_network_header(skb);
2434 /* Push new labels */
2435 hdr = mpls_hdr(skb);
2437 for (i = n_labels - 1; i >= 0; i--) {
2438 hdr[i] = mpls_entry_encode(labels[i],
2444 nh = mpls_select_multipath(rt, skb);
2451 skb_pull(skb, hdr_size);
2452 skb_reset_network_header(skb);
2455 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2456 RTM_NEWROUTE, sizeof(*r), 0);
2462 r = nlmsg_data(nlh);
2463 r->rtm_family = AF_MPLS;
2464 r->rtm_dst_len = 20;
2466 r->rtm_table = RT_TABLE_MAIN;
2467 r->rtm_type = RTN_UNICAST;
2468 r->rtm_scope = RT_SCOPE_UNIVERSE;
2469 r->rtm_protocol = rt->rt_protocol;
2472 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2473 goto nla_put_failure;
2475 if (nh->nh_labels &&
2476 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2478 goto nla_put_failure;
2480 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2481 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2483 goto nla_put_failure;
2484 dev = rtnl_dereference(nh->nh_dev);
2485 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2486 goto nla_put_failure;
2488 nlmsg_end(skb, nlh);
2490 err = rtnl_unicast(skb, net, portid);
2495 nlmsg_cancel(skb, nlh);
2502 static int resize_platform_label_table(struct net *net, size_t limit)
2504 size_t size = sizeof(struct mpls_route *) * limit;
2507 struct mpls_route __rcu **labels = NULL, **old;
2508 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2512 labels = kvzalloc(size, GFP_KERNEL);
2517 /* In case the predefined labels need to be populated */
2518 if (limit > MPLS_LABEL_IPV4NULL) {
2519 struct net_device *lo = net->loopback_dev;
2520 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2523 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
2524 rt0->rt_protocol = RTPROT_KERNEL;
2525 rt0->rt_payload_type = MPT_IPV4;
2526 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2527 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2528 rt0->rt_nh->nh_via_alen = lo->addr_len;
2529 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2532 if (limit > MPLS_LABEL_IPV6NULL) {
2533 struct net_device *lo = net->loopback_dev;
2534 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2537 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
2538 rt2->rt_protocol = RTPROT_KERNEL;
2539 rt2->rt_payload_type = MPT_IPV6;
2540 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2541 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2542 rt2->rt_nh->nh_via_alen = lo->addr_len;
2543 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2548 /* Remember the original table */
2549 old = rtnl_dereference(net->mpls.platform_label);
2550 old_limit = net->mpls.platform_labels;
2552 /* Free any labels beyond the new table */
2553 for (index = limit; index < old_limit; index++)
2554 mpls_route_update(net, index, NULL, NULL);
2556 /* Copy over the old labels */
2558 if (old_limit < limit)
2559 cp_size = old_limit * sizeof(struct mpls_route *);
2561 memcpy(labels, old, cp_size);
2563 /* If needed set the predefined labels */
2564 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2565 (limit > MPLS_LABEL_IPV6NULL)) {
2566 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2570 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2571 (limit > MPLS_LABEL_IPV4NULL)) {
2572 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2576 /* Update the global pointers */
2577 net->mpls.platform_labels = limit;
2578 rcu_assign_pointer(net->mpls.platform_label, labels);
2599 static int mpls_platform_labels(struct ctl_table *table, int write,
2600 void __user *buffer, size_t *lenp, loff_t *ppos)
2602 struct net *net = table->data;
2603 int platform_labels = net->mpls.platform_labels;
2605 struct ctl_table tmp = {
2606 .procname = table->procname,
2607 .data = &platform_labels,
2608 .maxlen = sizeof(int),
2609 .mode = table->mode,
2611 .extra2 = &label_limit,
2614 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2616 if (write && ret == 0)
2617 ret = resize_platform_label_table(net, platform_labels);
2622 #define MPLS_NS_SYSCTL_OFFSET(field) \
2623 (&((struct net *)0)->field)
2625 static const struct ctl_table mpls_table[] = {
2627 .procname = "platform_labels",
2629 .maxlen = sizeof(int),
2631 .proc_handler = mpls_platform_labels,
2634 .procname = "ip_ttl_propagate",
2635 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2636 .maxlen = sizeof(int),
2638 .proc_handler = proc_dointvec_minmax,
2643 .procname = "default_ttl",
2644 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2645 .maxlen = sizeof(int),
2647 .proc_handler = proc_dointvec_minmax,
2654 static int mpls_net_init(struct net *net)
2656 struct ctl_table *table;
2659 net->mpls.platform_labels = 0;
2660 net->mpls.platform_label = NULL;
2661 net->mpls.ip_ttl_propagate = 1;
2662 net->mpls.default_ttl = 255;
2664 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2668 /* Table data contains only offsets relative to the base of
2669 * the mdev at this point, so make them absolute.
2671 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2672 table[i].data = (char *)net + (uintptr_t)table[i].data;
2674 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
2675 if (net->mpls.ctl == NULL) {
2683 static void mpls_net_exit(struct net *net)
2685 struct mpls_route __rcu **platform_label;
2686 size_t platform_labels;
2687 struct ctl_table *table;
2690 table = net->mpls.ctl->ctl_table_arg;
2691 unregister_net_sysctl_table(net->mpls.ctl);
2694 /* An rcu grace period has passed since there was a device in
2695 * the network namespace (and thus the last in flight packet)
2696 * left this network namespace. This is because
2697 * unregister_netdevice_many and netdev_run_todo has completed
2698 * for each network device that was in this network namespace.
2700 * As such no additional rcu synchronization is necessary when
2701 * freeing the platform_label table.
2704 platform_label = rtnl_dereference(net->mpls.platform_label);
2705 platform_labels = net->mpls.platform_labels;
2706 for (index = 0; index < platform_labels; index++) {
2707 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2708 RCU_INIT_POINTER(platform_label[index], NULL);
2709 mpls_notify_route(net, index, rt, NULL, NULL);
2714 kvfree(platform_label);
2717 static struct pernet_operations mpls_net_ops = {
2718 .init = mpls_net_init,
2719 .exit = mpls_net_exit,
2722 static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2724 .fill_stats_af = mpls_fill_stats_af,
2725 .get_stats_af_size = mpls_get_stats_af_size,
2728 static int __init mpls_init(void)
2732 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2734 err = register_pernet_subsys(&mpls_net_ops);
2738 err = register_netdevice_notifier(&mpls_dev_notifier);
2740 goto out_unregister_pernet;
2742 dev_add_pack(&mpls_packet_type);
2744 rtnl_af_register(&mpls_af_ops);
2746 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2747 mpls_rtm_newroute, NULL, 0);
2748 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2749 mpls_rtm_delroute, NULL, 0);
2750 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2751 mpls_getroute, mpls_dump_routes, 0);
2752 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2753 mpls_netconf_get_devconf,
2754 mpls_netconf_dump_devconf, 0);
2755 err = ipgre_tunnel_encap_add_mpls_ops();
2757 pr_err("Can't add mpls over gre tunnel ops\n");
2763 out_unregister_pernet:
2764 unregister_pernet_subsys(&mpls_net_ops);
2767 module_init(mpls_init);
2769 static void __exit mpls_exit(void)
2771 rtnl_unregister_all(PF_MPLS);
2772 rtnl_af_unregister(&mpls_af_ops);
2773 dev_remove_pack(&mpls_packet_type);
2774 unregister_netdevice_notifier(&mpls_dev_notifier);
2775 unregister_pernet_subsys(&mpls_net_ops);
2776 ipgre_tunnel_encap_del_mpls_ops();
2778 module_exit(mpls_exit);
2780 MODULE_DESCRIPTION("MultiProtocol Label Switching");
2781 MODULE_LICENSE("GPL v2");
2782 MODULE_ALIAS_NETPROTO(PF_MPLS);