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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>
6#include <linux/net.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>
15#include <net/ip.h>
16#include <net/dst.h>
17#include <net/sock.h>
18#include <net/arp.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)
24#include <net/ipv6.h>
25#endif
26#include <net/ipv6_stubs.h>
27#include <net/rtnh.h>
28#include "internal.h"
29
30/* max memory we will use for mpls_route */
31#define MAX_MPLS_ROUTE_MEM 4096
32
33/* Maximum number of labels to look ahead at when selecting a path of
34 * a multipath route
35 */
36#define MAX_MP_SELECT_LABELS 4
37
38#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
39
40static int label_limit = (1 << 20) - 1;
41static int ttl_max = 255;
42
43#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
44static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
45{
46 return sizeof(struct mpls_shim_hdr);
47}
48
49static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
50 .encap_hlen = ipgre_mpls_encap_hlen,
51};
52
53static int ipgre_tunnel_encap_add_mpls_ops(void)
54{
55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
56}
57
58static void ipgre_tunnel_encap_del_mpls_ops(void)
59{
60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
61}
62#else
63static int ipgre_tunnel_encap_add_mpls_ops(void)
64{
65 return 0;
66}
67
68static void ipgre_tunnel_encap_del_mpls_ops(void)
69{
70}
71#endif
72
73static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
74 struct nlmsghdr *nlh, struct net *net, u32 portid,
75 unsigned int nlm_flags);
76
77static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
78{
79 struct mpls_route *rt = NULL;
80
81 if (index < net->mpls.platform_labels) {
82 struct mpls_route __rcu **platform_label =
83 rcu_dereference(net->mpls.platform_label);
84 rt = rcu_dereference(platform_label[index]);
85 }
86 return rt;
87}
88
89bool mpls_output_possible(const struct net_device *dev)
90{
91 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
92}
93EXPORT_SYMBOL_GPL(mpls_output_possible);
94
95static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
96{
97 return (u8 *)nh + rt->rt_via_offset;
98}
99
100static const u8 *mpls_nh_via(const struct mpls_route *rt,
101 const struct mpls_nh *nh)
102{
103 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
104}
105
106static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
107{
108 /* The size of the layer 2.5 labels to be added for this route */
109 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
110}
111
112unsigned int mpls_dev_mtu(const struct net_device *dev)
113{
114 /* The amount of data the layer 2 frame can hold */
115 return dev->mtu;
116}
117EXPORT_SYMBOL_GPL(mpls_dev_mtu);
118
119bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
120{
121 if (skb->len <= mtu)
122 return false;
123
124 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
125 return false;
126
127 return true;
128}
129EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
130
131void mpls_stats_inc_outucastpkts(struct net_device *dev,
132 const struct sk_buff *skb)
133{
134 struct mpls_dev *mdev;
135
136 if (skb->protocol == htons(ETH_P_MPLS_UC)) {
137 mdev = mpls_dev_get(dev);
138 if (mdev)
139 MPLS_INC_STATS_LEN(mdev, skb->len,
140 tx_packets,
141 tx_bytes);
142 } else if (skb->protocol == htons(ETH_P_IP)) {
143 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
144#if IS_ENABLED(CONFIG_IPV6)
145 } else if (skb->protocol == htons(ETH_P_IPV6)) {
146 struct inet6_dev *in6dev = __in6_dev_get(dev);
147
148 if (in6dev)
149 IP6_UPD_PO_STATS(dev_net(dev), in6dev,
150 IPSTATS_MIB_OUT, skb->len);
151#endif
152 }
153}
154EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
155
156static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
157{
158 struct mpls_entry_decoded dec;
159 unsigned int mpls_hdr_len = 0;
160 struct mpls_shim_hdr *hdr;
161 bool eli_seen = false;
162 int label_index;
163 u32 hash = 0;
164
165 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
166 label_index++) {
167 mpls_hdr_len += sizeof(*hdr);
168 if (!pskb_may_pull(skb, mpls_hdr_len))
169 break;
170
171 /* Read and decode the current label */
172 hdr = mpls_hdr(skb) + label_index;
173 dec = mpls_entry_decode(hdr);
174
175 /* RFC6790 - reserved labels MUST NOT be used as keys
176 * for the load-balancing function
177 */
178 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
179 hash = jhash_1word(dec.label, hash);
180
181 /* The entropy label follows the entropy label
182 * indicator, so this means that the entropy
183 * label was just added to the hash - no need to
184 * go any deeper either in the label stack or in the
185 * payload
186 */
187 if (eli_seen)
188 break;
189 } else if (dec.label == MPLS_LABEL_ENTROPY) {
190 eli_seen = true;
191 }
192
193 if (!dec.bos)
194 continue;
195
196 /* found bottom label; does skb have room for a header? */
197 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) {
198 const struct iphdr *v4hdr;
199
200 v4hdr = (const struct iphdr *)(hdr + 1);
201 if (v4hdr->version == 4) {
202 hash = jhash_3words(ntohl(v4hdr->saddr),
203 ntohl(v4hdr->daddr),
204 v4hdr->protocol, hash);
205 } else if (v4hdr->version == 6 &&
206 pskb_may_pull(skb, mpls_hdr_len +
207 sizeof(struct ipv6hdr))) {
208 const struct ipv6hdr *v6hdr;
209
210 v6hdr = (const struct ipv6hdr *)(hdr + 1);
211 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
212 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
213 hash = jhash_1word(v6hdr->nexthdr, hash);
214 }
215 }
216
217 break;
218 }
219
220 return hash;
221}
222
223static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
224{
225 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
226}
227
228/* number of alive nexthops (rt->rt_nhn_alive) and the flags for
229 * a next hop (nh->nh_flags) are modified by netdev event handlers.
230 * Since those fields can change at any moment, use READ_ONCE to
231 * access both.
232 */
233static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
234 struct sk_buff *skb)
235{
236 u32 hash = 0;
237 int nh_index = 0;
238 int n = 0;
239 u8 alive;
240
241 /* No need to look further into packet if there's only
242 * one path
243 */
244 if (rt->rt_nhn == 1)
245 return rt->rt_nh;
246
247 alive = READ_ONCE(rt->rt_nhn_alive);
248 if (alive == 0)
249 return NULL;
250
251 hash = mpls_multipath_hash(rt, skb);
252 nh_index = hash % alive;
253 if (alive == rt->rt_nhn)
254 goto out;
255 for_nexthops(rt) {
256 unsigned int nh_flags = READ_ONCE(nh->nh_flags);
257
258 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
259 continue;
260 if (n == nh_index)
261 return nh;
262 n++;
263 } endfor_nexthops(rt);
264
265out:
266 return mpls_get_nexthop(rt, nh_index);
267}
268
269static bool mpls_egress(struct net *net, struct mpls_route *rt,
270 struct sk_buff *skb, struct mpls_entry_decoded dec)
271{
272 enum mpls_payload_type payload_type;
273 bool success = false;
274
275 /* The IPv4 code below accesses through the IPv4 header
276 * checksum, which is 12 bytes into the packet.
277 * The IPv6 code below accesses through the IPv6 hop limit
278 * which is 8 bytes into the packet.
279 *
280 * For all supported cases there should always be at least 12
281 * bytes of packet data present. The IPv4 header is 20 bytes
282 * without options and the IPv6 header is always 40 bytes
283 * long.
284 */
285 if (!pskb_may_pull(skb, 12))
286 return false;
287
288 payload_type = rt->rt_payload_type;
289 if (payload_type == MPT_UNSPEC)
290 payload_type = ip_hdr(skb)->version;
291
292 switch (payload_type) {
293 case MPT_IPV4: {
294 struct iphdr *hdr4 = ip_hdr(skb);
295 u8 new_ttl;
296 skb->protocol = htons(ETH_P_IP);
297
298 /* If propagating TTL, take the decremented TTL from
299 * the incoming MPLS header, otherwise decrement the
300 * TTL, but only if not 0 to avoid underflow.
301 */
302 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
303 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
304 net->mpls.ip_ttl_propagate))
305 new_ttl = dec.ttl;
306 else
307 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0;
308
309 csum_replace2(&hdr4->check,
310 htons(hdr4->ttl << 8),
311 htons(new_ttl << 8));
312 hdr4->ttl = new_ttl;
313 success = true;
314 break;
315 }
316 case MPT_IPV6: {
317 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
318 skb->protocol = htons(ETH_P_IPV6);
319
320 /* If propagating TTL, take the decremented TTL from
321 * the incoming MPLS header, otherwise decrement the
322 * hop limit, but only if not 0 to avoid underflow.
323 */
324 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
325 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
326 net->mpls.ip_ttl_propagate))
327 hdr6->hop_limit = dec.ttl;
328 else if (hdr6->hop_limit)
329 hdr6->hop_limit = hdr6->hop_limit - 1;
330 success = true;
331 break;
332 }
333 case MPT_UNSPEC:
334 /* Should have decided which protocol it is by now */
335 break;
336 }
337
338 return success;
339}
340
341static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
342 struct packet_type *pt, struct net_device *orig_dev)
343{
344 struct net *net = dev_net(dev);
345 struct mpls_shim_hdr *hdr;
346 const struct mpls_nh *nh;
347 struct mpls_route *rt;
348 struct mpls_entry_decoded dec;
349 struct net_device *out_dev;
350 struct mpls_dev *out_mdev;
351 struct mpls_dev *mdev;
352 unsigned int hh_len;
353 unsigned int new_header_size;
354 unsigned int mtu;
355 int err;
356
357 /* Careful this entire function runs inside of an rcu critical section */
358
359 mdev = mpls_dev_get(dev);
360 if (!mdev)
361 goto drop;
362
363 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets,
364 rx_bytes);
365
366 if (!mdev->input_enabled) {
367 MPLS_INC_STATS(mdev, rx_dropped);
368 goto drop;
369 }
370
371 if (skb->pkt_type != PACKET_HOST)
372 goto err;
373
374 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
375 goto err;
376
377 if (!pskb_may_pull(skb, sizeof(*hdr)))
378 goto err;
379
380 skb_dst_drop(skb);
381
382 /* Read and decode the label */
383 hdr = mpls_hdr(skb);
384 dec = mpls_entry_decode(hdr);
385
386 rt = mpls_route_input_rcu(net, dec.label);
387 if (!rt) {
388 MPLS_INC_STATS(mdev, rx_noroute);
389 goto drop;
390 }
391
392 nh = mpls_select_multipath(rt, skb);
393 if (!nh)
394 goto err;
395
396 /* Pop the label */
397 skb_pull(skb, sizeof(*hdr));
398 skb_reset_network_header(skb);
399
400 skb_orphan(skb);
401
402 if (skb_warn_if_lro(skb))
403 goto err;
404
405 skb_forward_csum(skb);
406
407 /* Verify ttl is valid */
408 if (dec.ttl <= 1)
409 goto err;
410
411 /* Find the output device */
412 out_dev = nh->nh_dev;
413 if (!mpls_output_possible(out_dev))
414 goto tx_err;
415
416 /* Verify the destination can hold the packet */
417 new_header_size = mpls_nh_header_size(nh);
418 mtu = mpls_dev_mtu(out_dev);
419 if (mpls_pkt_too_big(skb, mtu - new_header_size))
420 goto tx_err;
421
422 hh_len = LL_RESERVED_SPACE(out_dev);
423 if (!out_dev->header_ops)
424 hh_len = 0;
425
426 /* Ensure there is enough space for the headers in the skb */
427 if (skb_cow(skb, hh_len + new_header_size))
428 goto tx_err;
429
430 skb->dev = out_dev;
431 skb->protocol = htons(ETH_P_MPLS_UC);
432
433 dec.ttl -= 1;
434 if (unlikely(!new_header_size && dec.bos)) {
435 /* Penultimate hop popping */
436 if (!mpls_egress(dev_net(out_dev), rt, skb, dec))
437 goto err;
438 } else {
439 bool bos;
440 int i;
441 skb_push(skb, new_header_size);
442 skb_reset_network_header(skb);
443 /* Push the new labels */
444 hdr = mpls_hdr(skb);
445 bos = dec.bos;
446 for (i = nh->nh_labels - 1; i >= 0; i--) {
447 hdr[i] = mpls_entry_encode(nh->nh_label[i],
448 dec.ttl, 0, bos);
449 bos = false;
450 }
451 }
452
453 mpls_stats_inc_outucastpkts(out_dev, skb);
454
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);
459 else
460 err = neigh_xmit(nh->nh_via_table, out_dev,
461 mpls_nh_via(rt, nh), skb);
462 if (err)
463 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
464 __func__, err);
465 return 0;
466
467tx_err:
468 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
469 if (out_mdev)
470 MPLS_INC_STATS(out_mdev, tx_errors);
471 goto drop;
472err:
473 MPLS_INC_STATS(mdev, rx_errors);
474drop:
475 kfree_skb(skb);
476 return NET_RX_DROP;
477}
478
479static struct packet_type mpls_packet_type __read_mostly = {
480 .type = cpu_to_be16(ETH_P_MPLS_UC),
481 .func = mpls_forward,
482};
483
484static 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 },
488};
489
490struct mpls_route_config {
491 u32 rc_protocol;
492 u32 rc_ifindex;
493 u8 rc_via_table;
494 u8 rc_via_alen;
495 u8 rc_via[MAX_VIA_ALEN];
496 u32 rc_label;
497 u8 rc_ttl_propagate;
498 u8 rc_output_labels;
499 u32 rc_output_label[MAX_NEW_LABELS];
500 u32 rc_nlflags;
501 enum mpls_payload_type rc_payload_type;
502 struct nl_info rc_nlinfo;
503 struct rtnexthop *rc_mp;
504 int rc_mp_len;
505};
506
507/* all nexthops within a route have the same size based on max
508 * number of labels and max via length for a hop
509 */
510static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
511{
512 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
513 struct mpls_route *rt;
514 size_t size;
515
516 size = sizeof(*rt) + num_nh * nh_size;
517 if (size > MAX_MPLS_ROUTE_MEM)
518 return ERR_PTR(-EINVAL);
519
520 rt = kzalloc(size, GFP_KERNEL);
521 if (!rt)
522 return ERR_PTR(-ENOMEM);
523
524 rt->rt_nhn = num_nh;
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);
528
529 return rt;
530}
531
532static void mpls_rt_free(struct mpls_route *rt)
533{
534 if (rt)
535 kfree_rcu(rt, rt_rcu);
536}
537
538static void mpls_notify_route(struct net *net, unsigned index,
539 struct mpls_route *old, struct mpls_route *new,
540 const struct nl_info *info)
541{
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);
550}
551
552static void mpls_route_update(struct net *net, unsigned index,
553 struct mpls_route *new,
554 const struct nl_info *info)
555{
556 struct mpls_route __rcu **platform_label;
557 struct mpls_route *rt;
558
559 ASSERT_RTNL();
560
561 platform_label = rtnl_dereference(net->mpls.platform_label);
562 rt = rtnl_dereference(platform_label[index]);
563 rcu_assign_pointer(platform_label[index], new);
564
565 mpls_notify_route(net, index, rt, new, info);
566
567 /* If we removed a route free it now */
568 mpls_rt_free(rt);
569}
570
571static unsigned find_free_label(struct net *net)
572{
573 struct mpls_route __rcu **platform_label;
574 size_t platform_labels;
575 unsigned index;
576
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;
580 index++) {
581 if (!rtnl_dereference(platform_label[index]))
582 return index;
583 }
584 return LABEL_NOT_SPECIFIED;
585}
586
587#if IS_ENABLED(CONFIG_INET)
588static struct net_device *inet_fib_lookup_dev(struct net *net,
589 const void *addr)
590{
591 struct net_device *dev;
592 struct rtable *rt;
593 struct in_addr daddr;
594
595 memcpy(&daddr, addr, sizeof(struct in_addr));
596 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
597 if (IS_ERR(rt))
598 return ERR_CAST(rt);
599
600 dev = rt->dst.dev;
601 dev_hold(dev);
602
603 ip_rt_put(rt);
604
605 return dev;
606}
607#else
608static struct net_device *inet_fib_lookup_dev(struct net *net,
609 const void *addr)
610{
611 return ERR_PTR(-EAFNOSUPPORT);
612}
613#endif
614
615#if IS_ENABLED(CONFIG_IPV6)
616static struct net_device *inet6_fib_lookup_dev(struct net *net,
617 const void *addr)
618{
619 struct net_device *dev;
620 struct dst_entry *dst;
621 struct flowi6 fl6;
622
623 if (!ipv6_stub)
624 return ERR_PTR(-EAFNOSUPPORT);
625
626 memset(&fl6, 0, sizeof(fl6));
627 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
628 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
629 if (IS_ERR(dst))
630 return ERR_CAST(dst);
631
632 dev = dst->dev;
633 dev_hold(dev);
634 dst_release(dst);
635
636 return dev;
637}
638#else
639static struct net_device *inet6_fib_lookup_dev(struct net *net,
640 const void *addr)
641{
642 return ERR_PTR(-EAFNOSUPPORT);
643}
644#endif
645
646static struct net_device *find_outdev(struct net *net,
647 struct mpls_route *rt,
648 struct mpls_nh *nh, int oif)
649{
650 struct net_device *dev = NULL;
651
652 if (!oif) {
653 switch (nh->nh_via_table) {
654 case NEIGH_ARP_TABLE:
655 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
656 break;
657 case NEIGH_ND_TABLE:
658 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
659 break;
660 case NEIGH_LINK_TABLE:
661 break;
662 }
663 } else {
664 dev = dev_get_by_index(net, oif);
665 }
666
667 if (!dev)
668 return ERR_PTR(-ENODEV);
669
670 if (IS_ERR(dev))
671 return dev;
672
673 /* The caller is holding rtnl anyways, so release the dev reference */
674 dev_put(dev);
675
676 return dev;
677}
678
679static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
680 struct mpls_nh *nh, int oif)
681{
682 struct net_device *dev = NULL;
683 int err = -ENODEV;
684
685 dev = find_outdev(net, rt, nh, oif);
686 if (IS_ERR(dev)) {
687 err = PTR_ERR(dev);
688 dev = NULL;
689 goto errout;
690 }
691
692 /* Ensure this is a supported device */
693 err = -EINVAL;
694 if (!mpls_dev_get(dev))
695 goto errout;
696
697 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
698 (dev->addr_len != nh->nh_via_alen))
699 goto errout;
700
701 nh->nh_dev = dev;
702
703 if (!(dev->flags & IFF_UP)) {
704 nh->nh_flags |= RTNH_F_DEAD;
705 } else {
706 unsigned int flags;
707
708 flags = dev_get_flags(dev);
709 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
710 nh->nh_flags |= RTNH_F_LINKDOWN;
711 }
712
713 return 0;
714
715errout:
716 return err;
717}
718
719static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
720 u8 via_addr[], struct netlink_ext_ack *extack)
721{
722 struct rtvia *via = nla_data(nla);
723 int err = -EINVAL;
724 int alen;
725
726 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
727 NL_SET_ERR_MSG_ATTR(extack, nla,
728 "Invalid attribute length for RTA_VIA");
729 goto errout;
730 }
731 alen = nla_len(nla) -
732 offsetof(struct rtvia, rtvia_addr);
733 if (alen > MAX_VIA_ALEN) {
734 NL_SET_ERR_MSG_ATTR(extack, nla,
735 "Invalid address length for RTA_VIA");
736 goto errout;
737 }
738
739 /* Validate the address family */
740 switch (via->rtvia_family) {
741 case AF_PACKET:
742 *via_table = NEIGH_LINK_TABLE;
743 break;
744 case AF_INET:
745 *via_table = NEIGH_ARP_TABLE;
746 if (alen != 4)
747 goto errout;
748 break;
749 case AF_INET6:
750 *via_table = NEIGH_ND_TABLE;
751 if (alen != 16)
752 goto errout;
753 break;
754 default:
755 /* Unsupported address family */
756 goto errout;
757 }
758
759 memcpy(via_addr, via->rtvia_addr, alen);
760 *via_alen = alen;
761 err = 0;
762
763errout:
764 return err;
765}
766
767static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
768 struct mpls_route *rt)
769{
770 struct net *net = cfg->rc_nlinfo.nl_net;
771 struct mpls_nh *nh = rt->rt_nh;
772 int err;
773 int i;
774
775 if (!nh)
776 return -ENOMEM;
777
778 nh->nh_labels = cfg->rc_output_labels;
779 for (i = 0; i < nh->nh_labels; i++)
780 nh->nh_label[i] = cfg->rc_output_label[i];
781
782 nh->nh_via_table = cfg->rc_via_table;
783 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
784 nh->nh_via_alen = cfg->rc_via_alen;
785
786 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
787 if (err)
788 goto errout;
789
790 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
791 rt->rt_nhn_alive--;
792
793 return 0;
794
795errout:
796 return err;
797}
798
799static int mpls_nh_build(struct net *net, struct mpls_route *rt,
800 struct mpls_nh *nh, int oif, struct nlattr *via,
801 struct nlattr *newdst, u8 max_labels,
802 struct netlink_ext_ack *extack)
803{
804 int err = -ENOMEM;
805
806 if (!nh)
807 goto errout;
808
809 if (newdst) {
810 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
811 nh->nh_label, extack);
812 if (err)
813 goto errout;
814 }
815
816 if (via) {
817 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
818 __mpls_nh_via(rt, nh), extack);
819 if (err)
820 goto errout;
821 } else {
822 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
823 }
824
825 err = mpls_nh_assign_dev(net, rt, nh, oif);
826 if (err)
827 goto errout;
828
829 return 0;
830
831errout:
832 return err;
833}
834
835static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
836 u8 cfg_via_alen, u8 *max_via_alen,
837 u8 *max_labels)
838{
839 int remaining = len;
840 u8 nhs = 0;
841
842 *max_via_alen = 0;
843 *max_labels = 0;
844
845 while (rtnh_ok(rtnh, remaining)) {
846 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
847 int attrlen;
848 u8 n_labels = 0;
849
850 attrlen = rtnh_attrlen(rtnh);
851 nla = nla_find(attrs, attrlen, RTA_VIA);
852 if (nla && nla_len(nla) >=
853 offsetof(struct rtvia, rtvia_addr)) {
854 int via_alen = nla_len(nla) -
855 offsetof(struct rtvia, rtvia_addr);
856
857 if (via_alen <= MAX_VIA_ALEN)
858 *max_via_alen = max_t(u16, *max_via_alen,
859 via_alen);
860 }
861
862 nla = nla_find(attrs, attrlen, RTA_NEWDST);
863 if (nla &&
864 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
865 NULL, NULL) != 0)
866 return 0;
867
868 *max_labels = max_t(u8, *max_labels, n_labels);
869
870 /* number of nexthops is tracked by a u8.
871 * Check for overflow.
872 */
873 if (nhs == 255)
874 return 0;
875 nhs++;
876
877 rtnh = rtnh_next(rtnh, &remaining);
878 }
879
880 /* leftover implies invalid nexthop configuration, discard it */
881 return remaining > 0 ? 0 : nhs;
882}
883
884static int mpls_nh_build_multi(struct mpls_route_config *cfg,
885 struct mpls_route *rt, u8 max_labels,
886 struct netlink_ext_ack *extack)
887{
888 struct rtnexthop *rtnh = cfg->rc_mp;
889 struct nlattr *nla_via, *nla_newdst;
890 int remaining = cfg->rc_mp_len;
891 int err = 0;
892 u8 nhs = 0;
893
894 change_nexthops(rt) {
895 int attrlen;
896
897 nla_via = NULL;
898 nla_newdst = NULL;
899
900 err = -EINVAL;
901 if (!rtnh_ok(rtnh, remaining))
902 goto errout;
903
904 /* neither weighted multipath nor any flags
905 * are supported
906 */
907 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
908 goto errout;
909
910 attrlen = rtnh_attrlen(rtnh);
911 if (attrlen > 0) {
912 struct nlattr *attrs = rtnh_attrs(rtnh);
913
914 nla_via = nla_find(attrs, attrlen, RTA_VIA);
915 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
916 }
917
918 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
919 rtnh->rtnh_ifindex, nla_via, nla_newdst,
920 max_labels, extack);
921 if (err)
922 goto errout;
923
924 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
925 rt->rt_nhn_alive--;
926
927 rtnh = rtnh_next(rtnh, &remaining);
928 nhs++;
929 } endfor_nexthops(rt);
930
931 rt->rt_nhn = nhs;
932
933 return 0;
934
935errout:
936 return err;
937}
938
939static bool mpls_label_ok(struct net *net, unsigned int *index,
940 struct netlink_ext_ack *extack)
941{
942 bool is_ok = true;
943
944 /* Reserved labels may not be set */
945 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
946 NL_SET_ERR_MSG(extack,
947 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
948 is_ok = false;
949 }
950
951 /* The full 20 bit range may not be supported. */
952 if (is_ok && *index >= net->mpls.platform_labels) {
953 NL_SET_ERR_MSG(extack,
954 "Label >= configured maximum in platform_labels");
955 is_ok = false;
956 }
957
958 *index = array_index_nospec(*index, net->mpls.platform_labels);
959 return is_ok;
960}
961
962static int mpls_route_add(struct mpls_route_config *cfg,
963 struct netlink_ext_ack *extack)
964{
965 struct mpls_route __rcu **platform_label;
966 struct net *net = cfg->rc_nlinfo.nl_net;
967 struct mpls_route *rt, *old;
968 int err = -EINVAL;
969 u8 max_via_alen;
970 unsigned index;
971 u8 max_labels;
972 u8 nhs;
973
974 index = cfg->rc_label;
975
976 /* If a label was not specified during insert pick one */
977 if ((index == LABEL_NOT_SPECIFIED) &&
978 (cfg->rc_nlflags & NLM_F_CREATE)) {
979 index = find_free_label(net);
980 }
981
982 if (!mpls_label_ok(net, &index, extack))
983 goto errout;
984
985 /* Append makes no sense with mpls */
986 err = -EOPNOTSUPP;
987 if (cfg->rc_nlflags & NLM_F_APPEND) {
988 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
989 goto errout;
990 }
991
992 err = -EEXIST;
993 platform_label = rtnl_dereference(net->mpls.platform_label);
994 old = rtnl_dereference(platform_label[index]);
995 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
996 goto errout;
997
998 err = -EEXIST;
999 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
1000 goto errout;
1001
1002 err = -ENOENT;
1003 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1004 goto errout;
1005
1006 err = -EINVAL;
1007 if (cfg->rc_mp) {
1008 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1009 cfg->rc_via_alen, &max_via_alen,
1010 &max_labels);
1011 } else {
1012 max_via_alen = cfg->rc_via_alen;
1013 max_labels = cfg->rc_output_labels;
1014 nhs = 1;
1015 }
1016
1017 if (nhs == 0) {
1018 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
1019 goto errout;
1020 }
1021
1022 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1023 if (IS_ERR(rt)) {
1024 err = PTR_ERR(rt);
1025 goto errout;
1026 }
1027
1028 rt->rt_protocol = cfg->rc_protocol;
1029 rt->rt_payload_type = cfg->rc_payload_type;
1030 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1031
1032 if (cfg->rc_mp)
1033 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1034 else
1035 err = mpls_nh_build_from_cfg(cfg, rt);
1036 if (err)
1037 goto freert;
1038
1039 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1040
1041 return 0;
1042
1043freert:
1044 mpls_rt_free(rt);
1045errout:
1046 return err;
1047}
1048
1049static int mpls_route_del(struct mpls_route_config *cfg,
1050 struct netlink_ext_ack *extack)
1051{
1052 struct net *net = cfg->rc_nlinfo.nl_net;
1053 unsigned index;
1054 int err = -EINVAL;
1055
1056 index = cfg->rc_label;
1057
1058 if (!mpls_label_ok(net, &index, extack))
1059 goto errout;
1060
1061 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1062
1063 err = 0;
1064errout:
1065 return err;
1066}
1067
1068static void mpls_get_stats(struct mpls_dev *mdev,
1069 struct mpls_link_stats *stats)
1070{
1071 struct mpls_pcpu_stats *p;
1072 int i;
1073
1074 memset(stats, 0, sizeof(*stats));
1075
1076 for_each_possible_cpu(i) {
1077 struct mpls_link_stats local;
1078 unsigned int start;
1079
1080 p = per_cpu_ptr(mdev->stats, i);
1081 do {
1082 start = u64_stats_fetch_begin(&p->syncp);
1083 local = p->stats;
1084 } while (u64_stats_fetch_retry(&p->syncp, start));
1085
1086 stats->rx_packets += local.rx_packets;
1087 stats->rx_bytes += local.rx_bytes;
1088 stats->tx_packets += local.tx_packets;
1089 stats->tx_bytes += local.tx_bytes;
1090 stats->rx_errors += local.rx_errors;
1091 stats->tx_errors += local.tx_errors;
1092 stats->rx_dropped += local.rx_dropped;
1093 stats->tx_dropped += local.tx_dropped;
1094 stats->rx_noroute += local.rx_noroute;
1095 }
1096}
1097
1098static int mpls_fill_stats_af(struct sk_buff *skb,
1099 const struct net_device *dev)
1100{
1101 struct mpls_link_stats *stats;
1102 struct mpls_dev *mdev;
1103 struct nlattr *nla;
1104
1105 mdev = mpls_dev_get(dev);
1106 if (!mdev)
1107 return -ENODATA;
1108
1109 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1110 sizeof(struct mpls_link_stats),
1111 MPLS_STATS_UNSPEC);
1112 if (!nla)
1113 return -EMSGSIZE;
1114
1115 stats = nla_data(nla);
1116 mpls_get_stats(mdev, stats);
1117
1118 return 0;
1119}
1120
1121static size_t mpls_get_stats_af_size(const struct net_device *dev)
1122{
1123 struct mpls_dev *mdev;
1124
1125 mdev = mpls_dev_get(dev);
1126 if (!mdev)
1127 return 0;
1128
1129 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1130}
1131
1132static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1133 u32 portid, u32 seq, int event,
1134 unsigned int flags, int type)
1135{
1136 struct nlmsghdr *nlh;
1137 struct netconfmsg *ncm;
1138 bool all = false;
1139
1140 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1141 flags);
1142 if (!nlh)
1143 return -EMSGSIZE;
1144
1145 if (type == NETCONFA_ALL)
1146 all = true;
1147
1148 ncm = nlmsg_data(nlh);
1149 ncm->ncm_family = AF_MPLS;
1150
1151 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1152 goto nla_put_failure;
1153
1154 if ((all || type == NETCONFA_INPUT) &&
1155 nla_put_s32(skb, NETCONFA_INPUT,
1156 mdev->input_enabled) < 0)
1157 goto nla_put_failure;
1158
1159 nlmsg_end(skb, nlh);
1160 return 0;
1161
1162nla_put_failure:
1163 nlmsg_cancel(skb, nlh);
1164 return -EMSGSIZE;
1165}
1166
1167static int mpls_netconf_msgsize_devconf(int type)
1168{
1169 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1170 + nla_total_size(4); /* NETCONFA_IFINDEX */
1171 bool all = false;
1172
1173 if (type == NETCONFA_ALL)
1174 all = true;
1175
1176 if (all || type == NETCONFA_INPUT)
1177 size += nla_total_size(4);
1178
1179 return size;
1180}
1181
1182static void mpls_netconf_notify_devconf(struct net *net, int event,
1183 int type, struct mpls_dev *mdev)
1184{
1185 struct sk_buff *skb;
1186 int err = -ENOBUFS;
1187
1188 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1189 if (!skb)
1190 goto errout;
1191
1192 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1193 if (err < 0) {
1194 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1195 WARN_ON(err == -EMSGSIZE);
1196 kfree_skb(skb);
1197 goto errout;
1198 }
1199
1200 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1201 return;
1202errout:
1203 if (err < 0)
1204 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1205}
1206
1207static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1208 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1209};
1210
1211static int mpls_netconf_valid_get_req(struct sk_buff *skb,
1212 const struct nlmsghdr *nlh,
1213 struct nlattr **tb,
1214 struct netlink_ext_ack *extack)
1215{
1216 int i, err;
1217
1218 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
1219 NL_SET_ERR_MSG_MOD(extack,
1220 "Invalid header for netconf get request");
1221 return -EINVAL;
1222 }
1223
1224 if (!netlink_strict_get_check(skb))
1225 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
1226 tb, NETCONFA_MAX,
1227 devconf_mpls_policy, extack);
1228
1229 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
1230 tb, NETCONFA_MAX,
1231 devconf_mpls_policy, extack);
1232 if (err)
1233 return err;
1234
1235 for (i = 0; i <= NETCONFA_MAX; i++) {
1236 if (!tb[i])
1237 continue;
1238
1239 switch (i) {
1240 case NETCONFA_IFINDEX:
1241 break;
1242 default:
1243 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
1244 return -EINVAL;
1245 }
1246 }
1247
1248 return 0;
1249}
1250
1251static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1252 struct nlmsghdr *nlh,
1253 struct netlink_ext_ack *extack)
1254{
1255 struct net *net = sock_net(in_skb->sk);
1256 struct nlattr *tb[NETCONFA_MAX + 1];
1257 struct net_device *dev;
1258 struct mpls_dev *mdev;
1259 struct sk_buff *skb;
1260 int ifindex;
1261 int err;
1262
1263 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
1264 if (err < 0)
1265 goto errout;
1266
1267 err = -EINVAL;
1268 if (!tb[NETCONFA_IFINDEX])
1269 goto errout;
1270
1271 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1272 dev = __dev_get_by_index(net, ifindex);
1273 if (!dev)
1274 goto errout;
1275
1276 mdev = mpls_dev_get(dev);
1277 if (!mdev)
1278 goto errout;
1279
1280 err = -ENOBUFS;
1281 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1282 if (!skb)
1283 goto errout;
1284
1285 err = mpls_netconf_fill_devconf(skb, mdev,
1286 NETLINK_CB(in_skb).portid,
1287 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1288 NETCONFA_ALL);
1289 if (err < 0) {
1290 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1291 WARN_ON(err == -EMSGSIZE);
1292 kfree_skb(skb);
1293 goto errout;
1294 }
1295 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1296errout:
1297 return err;
1298}
1299
1300static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1301 struct netlink_callback *cb)
1302{
1303 const struct nlmsghdr *nlh = cb->nlh;
1304 struct net *net = sock_net(skb->sk);
1305 struct hlist_head *head;
1306 struct net_device *dev;
1307 struct mpls_dev *mdev;
1308 int idx, s_idx;
1309 int h, s_h;
1310
1311 if (cb->strict_check) {
1312 struct netlink_ext_ack *extack = cb->extack;
1313 struct netconfmsg *ncm;
1314
1315 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1316 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1317 return -EINVAL;
1318 }
1319
1320 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1321 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1322 return -EINVAL;
1323 }
1324 }
1325
1326 s_h = cb->args[0];
1327 s_idx = idx = cb->args[1];
1328
1329 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1330 idx = 0;
1331 head = &net->dev_index_head[h];
1332 rcu_read_lock();
1333 cb->seq = net->dev_base_seq;
1334 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1335 if (idx < s_idx)
1336 goto cont;
1337 mdev = mpls_dev_get(dev);
1338 if (!mdev)
1339 goto cont;
1340 if (mpls_netconf_fill_devconf(skb, mdev,
1341 NETLINK_CB(cb->skb).portid,
1342 nlh->nlmsg_seq,
1343 RTM_NEWNETCONF,
1344 NLM_F_MULTI,
1345 NETCONFA_ALL) < 0) {
1346 rcu_read_unlock();
1347 goto done;
1348 }
1349 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1350cont:
1351 idx++;
1352 }
1353 rcu_read_unlock();
1354 }
1355done:
1356 cb->args[0] = h;
1357 cb->args[1] = idx;
1358
1359 return skb->len;
1360}
1361
1362#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1363 (&((struct mpls_dev *)0)->field)
1364
1365static int mpls_conf_proc(struct ctl_table *ctl, int write,
1366 void *buffer, size_t *lenp, loff_t *ppos)
1367{
1368 int oval = *(int *)ctl->data;
1369 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1370
1371 if (write) {
1372 struct mpls_dev *mdev = ctl->extra1;
1373 int i = (int *)ctl->data - (int *)mdev;
1374 struct net *net = ctl->extra2;
1375 int val = *(int *)ctl->data;
1376
1377 if (i == offsetof(struct mpls_dev, input_enabled) &&
1378 val != oval) {
1379 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1380 NETCONFA_INPUT, mdev);
1381 }
1382 }
1383
1384 return ret;
1385}
1386
1387static const struct ctl_table mpls_dev_table[] = {
1388 {
1389 .procname = "input",
1390 .maxlen = sizeof(int),
1391 .mode = 0644,
1392 .proc_handler = mpls_conf_proc,
1393 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1394 },
1395 { }
1396};
1397
1398static int mpls_dev_sysctl_register(struct net_device *dev,
1399 struct mpls_dev *mdev)
1400{
1401 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1402 struct net *net = dev_net(dev);
1403 struct ctl_table *table;
1404 int i;
1405
1406 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1407 if (!table)
1408 goto out;
1409
1410 /* Table data contains only offsets relative to the base of
1411 * the mdev at this point, so make them absolute.
1412 */
1413 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
1414 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1415 table[i].extra1 = mdev;
1416 table[i].extra2 = net;
1417 }
1418
1419 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1420
1421 mdev->sysctl = register_net_sysctl(net, path, table);
1422 if (!mdev->sysctl)
1423 goto free;
1424
1425 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1426 return 0;
1427
1428free:
1429 kfree(table);
1430out:
1431 mdev->sysctl = NULL;
1432 return -ENOBUFS;
1433}
1434
1435static void mpls_dev_sysctl_unregister(struct net_device *dev,
1436 struct mpls_dev *mdev)
1437{
1438 struct net *net = dev_net(dev);
1439 struct ctl_table *table;
1440
1441 if (!mdev->sysctl)
1442 return;
1443
1444 table = mdev->sysctl->ctl_table_arg;
1445 unregister_net_sysctl_table(mdev->sysctl);
1446 kfree(table);
1447
1448 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1449}
1450
1451static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1452{
1453 struct mpls_dev *mdev;
1454 int err = -ENOMEM;
1455 int i;
1456
1457 ASSERT_RTNL();
1458
1459 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1460 if (!mdev)
1461 return ERR_PTR(err);
1462
1463 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1464 if (!mdev->stats)
1465 goto free;
1466
1467 for_each_possible_cpu(i) {
1468 struct mpls_pcpu_stats *mpls_stats;
1469
1470 mpls_stats = per_cpu_ptr(mdev->stats, i);
1471 u64_stats_init(&mpls_stats->syncp);
1472 }
1473
1474 mdev->dev = dev;
1475
1476 err = mpls_dev_sysctl_register(dev, mdev);
1477 if (err)
1478 goto free;
1479
1480 rcu_assign_pointer(dev->mpls_ptr, mdev);
1481
1482 return mdev;
1483
1484free:
1485 free_percpu(mdev->stats);
1486 kfree(mdev);
1487 return ERR_PTR(err);
1488}
1489
1490static void mpls_dev_destroy_rcu(struct rcu_head *head)
1491{
1492 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1493
1494 free_percpu(mdev->stats);
1495 kfree(mdev);
1496}
1497
1498static int mpls_ifdown(struct net_device *dev, int event)
1499{
1500 struct mpls_route __rcu **platform_label;
1501 struct net *net = dev_net(dev);
1502 unsigned index;
1503
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]);
1507 bool nh_del = false;
1508 u8 alive = 0;
1509
1510 if (!rt)
1511 continue;
1512
1513 if (event == NETDEV_UNREGISTER) {
1514 u8 deleted = 0;
1515
1516 for_nexthops(rt) {
1517 if (!nh->nh_dev || nh->nh_dev == dev)
1518 deleted++;
1519 if (nh->nh_dev == dev)
1520 nh_del = true;
1521 } endfor_nexthops(rt);
1522
1523 /* if there are no more nexthops, delete the route */
1524 if (deleted == rt->rt_nhn) {
1525 mpls_route_update(net, index, NULL, NULL);
1526 continue;
1527 }
1528
1529 if (nh_del) {
1530 size_t size = sizeof(*rt) + rt->rt_nhn *
1531 rt->rt_nh_size;
1532 struct mpls_route *orig = rt;
1533
1534 rt = kmemdup(orig, size, GFP_KERNEL);
1535 if (!rt)
1536 return -ENOMEM;
1537 }
1538 }
1539
1540 change_nexthops(rt) {
1541 unsigned int nh_flags = nh->nh_flags;
1542
1543 if (nh->nh_dev != dev)
1544 goto next;
1545
1546 switch (event) {
1547 case NETDEV_DOWN:
1548 case NETDEV_UNREGISTER:
1549 nh_flags |= RTNH_F_DEAD;
1550 fallthrough;
1551 case NETDEV_CHANGE:
1552 nh_flags |= RTNH_F_LINKDOWN;
1553 break;
1554 }
1555 if (event == NETDEV_UNREGISTER)
1556 nh->nh_dev = NULL;
1557
1558 if (nh->nh_flags != nh_flags)
1559 WRITE_ONCE(nh->nh_flags, nh_flags);
1560next:
1561 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1562 alive++;
1563 } endfor_nexthops(rt);
1564
1565 WRITE_ONCE(rt->rt_nhn_alive, alive);
1566
1567 if (nh_del)
1568 mpls_route_update(net, index, rt, NULL);
1569 }
1570
1571 return 0;
1572}
1573
1574static void mpls_ifup(struct net_device *dev, unsigned int flags)
1575{
1576 struct mpls_route __rcu **platform_label;
1577 struct net *net = dev_net(dev);
1578 unsigned index;
1579 u8 alive;
1580
1581 platform_label = rtnl_dereference(net->mpls.platform_label);
1582 for (index = 0; index < net->mpls.platform_labels; index++) {
1583 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1584
1585 if (!rt)
1586 continue;
1587
1588 alive = 0;
1589 change_nexthops(rt) {
1590 unsigned int nh_flags = nh->nh_flags;
1591
1592 if (!(nh_flags & flags)) {
1593 alive++;
1594 continue;
1595 }
1596 if (nh->nh_dev != dev)
1597 continue;
1598 alive++;
1599 nh_flags &= ~flags;
1600 WRITE_ONCE(nh->nh_flags, nh_flags);
1601 } endfor_nexthops(rt);
1602
1603 WRITE_ONCE(rt->rt_nhn_alive, alive);
1604 }
1605}
1606
1607static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1608 void *ptr)
1609{
1610 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1611 struct mpls_dev *mdev;
1612 unsigned int flags;
1613 int err;
1614
1615 if (event == NETDEV_REGISTER) {
1616 mdev = mpls_add_dev(dev);
1617 if (IS_ERR(mdev))
1618 return notifier_from_errno(PTR_ERR(mdev));
1619
1620 return NOTIFY_OK;
1621 }
1622
1623 mdev = mpls_dev_get(dev);
1624 if (!mdev)
1625 return NOTIFY_OK;
1626
1627 switch (event) {
1628
1629 case NETDEV_DOWN:
1630 err = mpls_ifdown(dev, event);
1631 if (err)
1632 return notifier_from_errno(err);
1633 break;
1634 case NETDEV_UP:
1635 flags = dev_get_flags(dev);
1636 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1637 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1638 else
1639 mpls_ifup(dev, RTNH_F_DEAD);
1640 break;
1641 case NETDEV_CHANGE:
1642 flags = dev_get_flags(dev);
1643 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) {
1644 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1645 } else {
1646 err = mpls_ifdown(dev, event);
1647 if (err)
1648 return notifier_from_errno(err);
1649 }
1650 break;
1651 case NETDEV_UNREGISTER:
1652 err = mpls_ifdown(dev, event);
1653 if (err)
1654 return notifier_from_errno(err);
1655 mdev = mpls_dev_get(dev);
1656 if (mdev) {
1657 mpls_dev_sysctl_unregister(dev, mdev);
1658 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1659 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1660 }
1661 break;
1662 case NETDEV_CHANGENAME:
1663 mdev = mpls_dev_get(dev);
1664 if (mdev) {
1665 mpls_dev_sysctl_unregister(dev, mdev);
1666 err = mpls_dev_sysctl_register(dev, mdev);
1667 if (err)
1668 return notifier_from_errno(err);
1669 }
1670 break;
1671 }
1672 return NOTIFY_OK;
1673}
1674
1675static struct notifier_block mpls_dev_notifier = {
1676 .notifier_call = mpls_dev_notify,
1677};
1678
1679static int nla_put_via(struct sk_buff *skb,
1680 u8 table, const void *addr, int alen)
1681{
1682 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1683 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1684 };
1685 struct nlattr *nla;
1686 struct rtvia *via;
1687 int family = AF_UNSPEC;
1688
1689 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1690 if (!nla)
1691 return -EMSGSIZE;
1692
1693 if (table <= NEIGH_NR_TABLES)
1694 family = table_to_family[table];
1695
1696 via = nla_data(nla);
1697 via->rtvia_family = family;
1698 memcpy(via->rtvia_addr, addr, alen);
1699 return 0;
1700}
1701
1702int nla_put_labels(struct sk_buff *skb, int attrtype,
1703 u8 labels, const u32 label[])
1704{
1705 struct nlattr *nla;
1706 struct mpls_shim_hdr *nla_label;
1707 bool bos;
1708 int i;
1709 nla = nla_reserve(skb, attrtype, labels*4);
1710 if (!nla)
1711 return -EMSGSIZE;
1712
1713 nla_label = nla_data(nla);
1714 bos = true;
1715 for (i = labels - 1; i >= 0; i--) {
1716 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1717 bos = false;
1718 }
1719
1720 return 0;
1721}
1722EXPORT_SYMBOL_GPL(nla_put_labels);
1723
1724int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1725 u32 label[], struct netlink_ext_ack *extack)
1726{
1727 unsigned len = nla_len(nla);
1728 struct mpls_shim_hdr *nla_label;
1729 u8 nla_labels;
1730 bool bos;
1731 int i;
1732
1733 /* len needs to be an even multiple of 4 (the label size). Number
1734 * of labels is a u8 so check for overflow.
1735 */
1736 if (len & 3 || len / 4 > 255) {
1737 NL_SET_ERR_MSG_ATTR(extack, nla,
1738 "Invalid length for labels attribute");
1739 return -EINVAL;
1740 }
1741
1742 /* Limit the number of new labels allowed */
1743 nla_labels = len/4;
1744 if (nla_labels > max_labels) {
1745 NL_SET_ERR_MSG(extack, "Too many labels");
1746 return -EINVAL;
1747 }
1748
1749 /* when label == NULL, caller wants number of labels */
1750 if (!label)
1751 goto out;
1752
1753 nla_label = nla_data(nla);
1754 bos = true;
1755 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1756 struct mpls_entry_decoded dec;
1757 dec = mpls_entry_decode(nla_label + i);
1758
1759 /* Ensure the bottom of stack flag is properly set
1760 * and ttl and tc are both clear.
1761 */
1762 if (dec.ttl) {
1763 NL_SET_ERR_MSG_ATTR(extack, nla,
1764 "TTL in label must be 0");
1765 return -EINVAL;
1766 }
1767
1768 if (dec.tc) {
1769 NL_SET_ERR_MSG_ATTR(extack, nla,
1770 "Traffic class in label must be 0");
1771 return -EINVAL;
1772 }
1773
1774 if (dec.bos != bos) {
1775 NL_SET_BAD_ATTR(extack, nla);
1776 if (bos) {
1777 NL_SET_ERR_MSG(extack,
1778 "BOS bit must be set in first label");
1779 } else {
1780 NL_SET_ERR_MSG(extack,
1781 "BOS bit can only be set in first label");
1782 }
1783 return -EINVAL;
1784 }
1785
1786 switch (dec.label) {
1787 case MPLS_LABEL_IMPLNULL:
1788 /* RFC3032: This is a label that an LSR may
1789 * assign and distribute, but which never
1790 * actually appears in the encapsulation.
1791 */
1792 NL_SET_ERR_MSG_ATTR(extack, nla,
1793 "Implicit NULL Label (3) can not be used in encapsulation");
1794 return -EINVAL;
1795 }
1796
1797 label[i] = dec.label;
1798 }
1799out:
1800 *labels = nla_labels;
1801 return 0;
1802}
1803EXPORT_SYMBOL_GPL(nla_get_labels);
1804
1805static int rtm_to_route_config(struct sk_buff *skb,
1806 struct nlmsghdr *nlh,
1807 struct mpls_route_config *cfg,
1808 struct netlink_ext_ack *extack)
1809{
1810 struct rtmsg *rtm;
1811 struct nlattr *tb[RTA_MAX+1];
1812 int index;
1813 int err;
1814
1815 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1816 rtm_mpls_policy, extack);
1817 if (err < 0)
1818 goto errout;
1819
1820 err = -EINVAL;
1821 rtm = nlmsg_data(nlh);
1822
1823 if (rtm->rtm_family != AF_MPLS) {
1824 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1825 goto errout;
1826 }
1827 if (rtm->rtm_dst_len != 20) {
1828 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1829 goto errout;
1830 }
1831 if (rtm->rtm_src_len != 0) {
1832 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1833 goto errout;
1834 }
1835 if (rtm->rtm_tos != 0) {
1836 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1837 goto errout;
1838 }
1839 if (rtm->rtm_table != RT_TABLE_MAIN) {
1840 NL_SET_ERR_MSG(extack,
1841 "MPLS only supports the main route table");
1842 goto errout;
1843 }
1844 /* Any value is acceptable for rtm_protocol */
1845
1846 /* As mpls uses destination specific addresses
1847 * (or source specific address in the case of multicast)
1848 * all addresses have universal scope.
1849 */
1850 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1851 NL_SET_ERR_MSG(extack,
1852 "Invalid route scope - MPLS only supports UNIVERSE");
1853 goto errout;
1854 }
1855 if (rtm->rtm_type != RTN_UNICAST) {
1856 NL_SET_ERR_MSG(extack,
1857 "Invalid route type - MPLS only supports UNICAST");
1858 goto errout;
1859 }
1860 if (rtm->rtm_flags != 0) {
1861 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1862 goto errout;
1863 }
1864
1865 cfg->rc_label = LABEL_NOT_SPECIFIED;
1866 cfg->rc_protocol = rtm->rtm_protocol;
1867 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1868 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1869 cfg->rc_nlflags = nlh->nlmsg_flags;
1870 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1871 cfg->rc_nlinfo.nlh = nlh;
1872 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1873
1874 for (index = 0; index <= RTA_MAX; index++) {
1875 struct nlattr *nla = tb[index];
1876 if (!nla)
1877 continue;
1878
1879 switch (index) {
1880 case RTA_OIF:
1881 cfg->rc_ifindex = nla_get_u32(nla);
1882 break;
1883 case RTA_NEWDST:
1884 if (nla_get_labels(nla, MAX_NEW_LABELS,
1885 &cfg->rc_output_labels,
1886 cfg->rc_output_label, extack))
1887 goto errout;
1888 break;
1889 case RTA_DST:
1890 {
1891 u8 label_count;
1892 if (nla_get_labels(nla, 1, &label_count,
1893 &cfg->rc_label, extack))
1894 goto errout;
1895
1896 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1897 &cfg->rc_label, extack))
1898 goto errout;
1899 break;
1900 }
1901 case RTA_GATEWAY:
1902 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
1903 goto errout;
1904 case RTA_VIA:
1905 {
1906 if (nla_get_via(nla, &cfg->rc_via_alen,
1907 &cfg->rc_via_table, cfg->rc_via,
1908 extack))
1909 goto errout;
1910 break;
1911 }
1912 case RTA_MULTIPATH:
1913 {
1914 cfg->rc_mp = nla_data(nla);
1915 cfg->rc_mp_len = nla_len(nla);
1916 break;
1917 }
1918 case RTA_TTL_PROPAGATE:
1919 {
1920 u8 ttl_propagate = nla_get_u8(nla);
1921
1922 if (ttl_propagate > 1) {
1923 NL_SET_ERR_MSG_ATTR(extack, nla,
1924 "RTA_TTL_PROPAGATE can only be 0 or 1");
1925 goto errout;
1926 }
1927 cfg->rc_ttl_propagate = ttl_propagate ?
1928 MPLS_TTL_PROP_ENABLED :
1929 MPLS_TTL_PROP_DISABLED;
1930 break;
1931 }
1932 default:
1933 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1934 /* Unsupported attribute */
1935 goto errout;
1936 }
1937 }
1938
1939 err = 0;
1940errout:
1941 return err;
1942}
1943
1944static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1945 struct netlink_ext_ack *extack)
1946{
1947 struct mpls_route_config *cfg;
1948 int err;
1949
1950 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1951 if (!cfg)
1952 return -ENOMEM;
1953
1954 err = rtm_to_route_config(skb, nlh, cfg, extack);
1955 if (err < 0)
1956 goto out;
1957
1958 err = mpls_route_del(cfg, extack);
1959out:
1960 kfree(cfg);
1961
1962 return err;
1963}
1964
1965
1966static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1967 struct netlink_ext_ack *extack)
1968{
1969 struct mpls_route_config *cfg;
1970 int err;
1971
1972 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1973 if (!cfg)
1974 return -ENOMEM;
1975
1976 err = rtm_to_route_config(skb, nlh, cfg, extack);
1977 if (err < 0)
1978 goto out;
1979
1980 err = mpls_route_add(cfg, extack);
1981out:
1982 kfree(cfg);
1983
1984 return err;
1985}
1986
1987static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1988 u32 label, struct mpls_route *rt, int flags)
1989{
1990 struct net_device *dev;
1991 struct nlmsghdr *nlh;
1992 struct rtmsg *rtm;
1993
1994 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1995 if (nlh == NULL)
1996 return -EMSGSIZE;
1997
1998 rtm = nlmsg_data(nlh);
1999 rtm->rtm_family = AF_MPLS;
2000 rtm->rtm_dst_len = 20;
2001 rtm->rtm_src_len = 0;
2002 rtm->rtm_tos = 0;
2003 rtm->rtm_table = RT_TABLE_MAIN;
2004 rtm->rtm_protocol = rt->rt_protocol;
2005 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2006 rtm->rtm_type = RTN_UNICAST;
2007 rtm->rtm_flags = 0;
2008
2009 if (nla_put_labels(skb, RTA_DST, 1, &label))
2010 goto nla_put_failure;
2011
2012 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
2013 bool ttl_propagate =
2014 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
2015
2016 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
2017 ttl_propagate))
2018 goto nla_put_failure;
2019 }
2020 if (rt->rt_nhn == 1) {
2021 const struct mpls_nh *nh = rt->rt_nh;
2022
2023 if (nh->nh_labels &&
2024 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2025 nh->nh_label))
2026 goto nla_put_failure;
2027 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2028 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2029 nh->nh_via_alen))
2030 goto nla_put_failure;
2031 dev = nh->nh_dev;
2032 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2033 goto nla_put_failure;
2034 if (nh->nh_flags & RTNH_F_LINKDOWN)
2035 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2036 if (nh->nh_flags & RTNH_F_DEAD)
2037 rtm->rtm_flags |= RTNH_F_DEAD;
2038 } else {
2039 struct rtnexthop *rtnh;
2040 struct nlattr *mp;
2041 u8 linkdown = 0;
2042 u8 dead = 0;
2043
2044 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
2045 if (!mp)
2046 goto nla_put_failure;
2047
2048 for_nexthops(rt) {
2049 dev = nh->nh_dev;
2050 if (!dev)
2051 continue;
2052
2053 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
2054 if (!rtnh)
2055 goto nla_put_failure;
2056
2057 rtnh->rtnh_ifindex = dev->ifindex;
2058 if (nh->nh_flags & RTNH_F_LINKDOWN) {
2059 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
2060 linkdown++;
2061 }
2062 if (nh->nh_flags & RTNH_F_DEAD) {
2063 rtnh->rtnh_flags |= RTNH_F_DEAD;
2064 dead++;
2065 }
2066
2067 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2068 nh->nh_labels,
2069 nh->nh_label))
2070 goto nla_put_failure;
2071 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2072 nla_put_via(skb, nh->nh_via_table,
2073 mpls_nh_via(rt, nh),
2074 nh->nh_via_alen))
2075 goto nla_put_failure;
2076
2077 /* length of rtnetlink header + attributes */
2078 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2079 } endfor_nexthops(rt);
2080
2081 if (linkdown == rt->rt_nhn)
2082 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2083 if (dead == rt->rt_nhn)
2084 rtm->rtm_flags |= RTNH_F_DEAD;
2085
2086 nla_nest_end(skb, mp);
2087 }
2088
2089 nlmsg_end(skb, nlh);
2090 return 0;
2091
2092nla_put_failure:
2093 nlmsg_cancel(skb, nlh);
2094 return -EMSGSIZE;
2095}
2096
2097#if IS_ENABLED(CONFIG_INET)
2098static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2099 struct fib_dump_filter *filter,
2100 struct netlink_callback *cb)
2101{
2102 return ip_valid_fib_dump_req(net, nlh, filter, cb);
2103}
2104#else
2105static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2106 struct fib_dump_filter *filter,
2107 struct netlink_callback *cb)
2108{
2109 struct netlink_ext_ack *extack = cb->extack;
2110 struct nlattr *tb[RTA_MAX + 1];
2111 struct rtmsg *rtm;
2112 int err, i;
2113
2114 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2115 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2116 return -EINVAL;
2117 }
2118
2119 rtm = nlmsg_data(nlh);
2120 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
2121 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2122 rtm->rtm_flags) {
2123 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2124 return -EINVAL;
2125 }
2126
2127 if (rtm->rtm_protocol) {
2128 filter->protocol = rtm->rtm_protocol;
2129 filter->filter_set = 1;
2130 cb->answer_flags = NLM_F_DUMP_FILTERED;
2131 }
2132
2133 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2134 rtm_mpls_policy, extack);
2135 if (err < 0)
2136 return err;
2137
2138 for (i = 0; i <= RTA_MAX; ++i) {
2139 int ifindex;
2140
2141 if (i == RTA_OIF) {
2142 ifindex = nla_get_u32(tb[i]);
2143 filter->dev = __dev_get_by_index(net, ifindex);
2144 if (!filter->dev)
2145 return -ENODEV;
2146 filter->filter_set = 1;
2147 } else if (tb[i]) {
2148 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2149 return -EINVAL;
2150 }
2151 }
2152
2153 return 0;
2154}
2155#endif
2156
2157static bool mpls_rt_uses_dev(struct mpls_route *rt,
2158 const struct net_device *dev)
2159{
2160 if (rt->rt_nhn == 1) {
2161 struct mpls_nh *nh = rt->rt_nh;
2162
2163 if (nh->nh_dev == dev)
2164 return true;
2165 } else {
2166 for_nexthops(rt) {
2167 if (nh->nh_dev == dev)
2168 return true;
2169 } endfor_nexthops(rt);
2170 }
2171
2172 return false;
2173}
2174
2175static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2176{
2177 const struct nlmsghdr *nlh = cb->nlh;
2178 struct net *net = sock_net(skb->sk);
2179 struct mpls_route __rcu **platform_label;
2180 struct fib_dump_filter filter = {};
2181 unsigned int flags = NLM_F_MULTI;
2182 size_t platform_labels;
2183 unsigned int index;
2184
2185 ASSERT_RTNL();
2186
2187 if (cb->strict_check) {
2188 int err;
2189
2190 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
2191 if (err < 0)
2192 return err;
2193
2194 /* for MPLS, there is only 1 table with fixed type and flags.
2195 * If either are set in the filter then return nothing.
2196 */
2197 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2198 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2199 filter.flags)
2200 return skb->len;
2201 }
2202
2203 index = cb->args[0];
2204 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2205 index = MPLS_LABEL_FIRST_UNRESERVED;
2206
2207 platform_label = rtnl_dereference(net->mpls.platform_label);
2208 platform_labels = net->mpls.platform_labels;
2209
2210 if (filter.filter_set)
2211 flags |= NLM_F_DUMP_FILTERED;
2212
2213 for (; index < platform_labels; index++) {
2214 struct mpls_route *rt;
2215
2216 rt = rtnl_dereference(platform_label[index]);
2217 if (!rt)
2218 continue;
2219
2220 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2221 (filter.protocol && rt->rt_protocol != filter.protocol))
2222 continue;
2223
2224 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2225 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2226 index, rt, flags) < 0)
2227 break;
2228 }
2229 cb->args[0] = index;
2230
2231 return skb->len;
2232}
2233
2234static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2235{
2236 size_t payload =
2237 NLMSG_ALIGN(sizeof(struct rtmsg))
2238 + nla_total_size(4) /* RTA_DST */
2239 + nla_total_size(1); /* RTA_TTL_PROPAGATE */
2240
2241 if (rt->rt_nhn == 1) {
2242 struct mpls_nh *nh = rt->rt_nh;
2243
2244 if (nh->nh_dev)
2245 payload += nla_total_size(4); /* RTA_OIF */
2246 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
2247 payload += nla_total_size(2 + nh->nh_via_alen);
2248 if (nh->nh_labels) /* RTA_NEWDST */
2249 payload += nla_total_size(nh->nh_labels * 4);
2250 } else {
2251 /* each nexthop is packed in an attribute */
2252 size_t nhsize = 0;
2253
2254 for_nexthops(rt) {
2255 if (!nh->nh_dev)
2256 continue;
2257 nhsize += nla_total_size(sizeof(struct rtnexthop));
2258 /* RTA_VIA */
2259 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2260 nhsize += nla_total_size(2 + nh->nh_via_alen);
2261 if (nh->nh_labels)
2262 nhsize += nla_total_size(nh->nh_labels * 4);
2263 } endfor_nexthops(rt);
2264 /* nested attribute */
2265 payload += nla_total_size(nhsize);
2266 }
2267
2268 return payload;
2269}
2270
2271static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2272 struct nlmsghdr *nlh, struct net *net, u32 portid,
2273 unsigned int nlm_flags)
2274{
2275 struct sk_buff *skb;
2276 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2277 int err = -ENOBUFS;
2278
2279 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2280 if (skb == NULL)
2281 goto errout;
2282
2283 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2284 if (err < 0) {
2285 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2286 WARN_ON(err == -EMSGSIZE);
2287 kfree_skb(skb);
2288 goto errout;
2289 }
2290 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2291
2292 return;
2293errout:
2294 if (err < 0)
2295 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2296}
2297
2298static int mpls_valid_getroute_req(struct sk_buff *skb,
2299 const struct nlmsghdr *nlh,
2300 struct nlattr **tb,
2301 struct netlink_ext_ack *extack)
2302{
2303 struct rtmsg *rtm;
2304 int i, err;
2305
2306 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2307 NL_SET_ERR_MSG_MOD(extack,
2308 "Invalid header for get route request");
2309 return -EINVAL;
2310 }
2311
2312 if (!netlink_strict_get_check(skb))
2313 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2314 rtm_mpls_policy, extack);
2315
2316 rtm = nlmsg_data(nlh);
2317 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
2318 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
2319 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
2320 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
2321 return -EINVAL;
2322 }
2323 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
2324 NL_SET_ERR_MSG_MOD(extack,
2325 "Invalid flags for get route request");
2326 return -EINVAL;
2327 }
2328
2329 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2330 rtm_mpls_policy, extack);
2331 if (err)
2332 return err;
2333
2334 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
2335 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
2336 return -EINVAL;
2337 }
2338
2339 for (i = 0; i <= RTA_MAX; i++) {
2340 if (!tb[i])
2341 continue;
2342
2343 switch (i) {
2344 case RTA_DST:
2345 case RTA_NEWDST:
2346 break;
2347 default:
2348 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
2349 return -EINVAL;
2350 }
2351 }
2352
2353 return 0;
2354}
2355
2356static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2357 struct netlink_ext_ack *extack)
2358{
2359 struct net *net = sock_net(in_skb->sk);
2360 u32 portid = NETLINK_CB(in_skb).portid;
2361 u32 in_label = LABEL_NOT_SPECIFIED;
2362 struct nlattr *tb[RTA_MAX + 1];
2363 u32 labels[MAX_NEW_LABELS];
2364 struct mpls_shim_hdr *hdr;
2365 unsigned int hdr_size = 0;
2366 const struct mpls_nh *nh;
2367 struct net_device *dev;
2368 struct mpls_route *rt;
2369 struct rtmsg *rtm, *r;
2370 struct nlmsghdr *nlh;
2371 struct sk_buff *skb;
2372 u8 n_labels;
2373 int err;
2374
2375 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack);
2376 if (err < 0)
2377 goto errout;
2378
2379 rtm = nlmsg_data(in_nlh);
2380
2381 if (tb[RTA_DST]) {
2382 u8 label_count;
2383
2384 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2385 &in_label, extack)) {
2386 err = -EINVAL;
2387 goto errout;
2388 }
2389
2390 if (!mpls_label_ok(net, &in_label, extack)) {
2391 err = -EINVAL;
2392 goto errout;
2393 }
2394 }
2395
2396 rt = mpls_route_input_rcu(net, in_label);
2397 if (!rt) {
2398 err = -ENETUNREACH;
2399 goto errout;
2400 }
2401
2402 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2403 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2404 if (!skb) {
2405 err = -ENOBUFS;
2406 goto errout;
2407 }
2408
2409 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2410 RTM_NEWROUTE, in_label, rt, 0);
2411 if (err < 0) {
2412 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2413 WARN_ON(err == -EMSGSIZE);
2414 goto errout_free;
2415 }
2416
2417 return rtnl_unicast(skb, net, portid);
2418 }
2419
2420 if (tb[RTA_NEWDST]) {
2421 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2422 labels, extack) != 0) {
2423 err = -EINVAL;
2424 goto errout;
2425 }
2426
2427 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2428 }
2429
2430 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2431 if (!skb) {
2432 err = -ENOBUFS;
2433 goto errout;
2434 }
2435
2436 skb->protocol = htons(ETH_P_MPLS_UC);
2437
2438 if (hdr_size) {
2439 bool bos;
2440 int i;
2441
2442 if (skb_cow(skb, hdr_size)) {
2443 err = -ENOBUFS;
2444 goto errout_free;
2445 }
2446
2447 skb_reserve(skb, hdr_size);
2448 skb_push(skb, hdr_size);
2449 skb_reset_network_header(skb);
2450
2451 /* Push new labels */
2452 hdr = mpls_hdr(skb);
2453 bos = true;
2454 for (i = n_labels - 1; i >= 0; i--) {
2455 hdr[i] = mpls_entry_encode(labels[i],
2456 1, 0, bos);
2457 bos = false;
2458 }
2459 }
2460
2461 nh = mpls_select_multipath(rt, skb);
2462 if (!nh) {
2463 err = -ENETUNREACH;
2464 goto errout_free;
2465 }
2466
2467 if (hdr_size) {
2468 skb_pull(skb, hdr_size);
2469 skb_reset_network_header(skb);
2470 }
2471
2472 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2473 RTM_NEWROUTE, sizeof(*r), 0);
2474 if (!nlh) {
2475 err = -EMSGSIZE;
2476 goto errout_free;
2477 }
2478
2479 r = nlmsg_data(nlh);
2480 r->rtm_family = AF_MPLS;
2481 r->rtm_dst_len = 20;
2482 r->rtm_src_len = 0;
2483 r->rtm_table = RT_TABLE_MAIN;
2484 r->rtm_type = RTN_UNICAST;
2485 r->rtm_scope = RT_SCOPE_UNIVERSE;
2486 r->rtm_protocol = rt->rt_protocol;
2487 r->rtm_flags = 0;
2488
2489 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2490 goto nla_put_failure;
2491
2492 if (nh->nh_labels &&
2493 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2494 nh->nh_label))
2495 goto nla_put_failure;
2496
2497 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2498 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2499 nh->nh_via_alen))
2500 goto nla_put_failure;
2501 dev = nh->nh_dev;
2502 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2503 goto nla_put_failure;
2504
2505 nlmsg_end(skb, nlh);
2506
2507 err = rtnl_unicast(skb, net, portid);
2508errout:
2509 return err;
2510
2511nla_put_failure:
2512 nlmsg_cancel(skb, nlh);
2513 err = -EMSGSIZE;
2514errout_free:
2515 kfree_skb(skb);
2516 return err;
2517}
2518
2519static int resize_platform_label_table(struct net *net, size_t limit)
2520{
2521 size_t size = sizeof(struct mpls_route *) * limit;
2522 size_t old_limit;
2523 size_t cp_size;
2524 struct mpls_route __rcu **labels = NULL, **old;
2525 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2526 unsigned index;
2527
2528 if (size) {
2529 labels = kvzalloc(size, GFP_KERNEL);
2530 if (!labels)
2531 goto nolabels;
2532 }
2533
2534 /* In case the predefined labels need to be populated */
2535 if (limit > MPLS_LABEL_IPV4NULL) {
2536 struct net_device *lo = net->loopback_dev;
2537 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2538 if (IS_ERR(rt0))
2539 goto nort0;
2540 rt0->rt_nh->nh_dev = lo;
2541 rt0->rt_protocol = RTPROT_KERNEL;
2542 rt0->rt_payload_type = MPT_IPV4;
2543 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2544 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2545 rt0->rt_nh->nh_via_alen = lo->addr_len;
2546 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2547 lo->addr_len);
2548 }
2549 if (limit > MPLS_LABEL_IPV6NULL) {
2550 struct net_device *lo = net->loopback_dev;
2551 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2552 if (IS_ERR(rt2))
2553 goto nort2;
2554 rt2->rt_nh->nh_dev = lo;
2555 rt2->rt_protocol = RTPROT_KERNEL;
2556 rt2->rt_payload_type = MPT_IPV6;
2557 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2558 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2559 rt2->rt_nh->nh_via_alen = lo->addr_len;
2560 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2561 lo->addr_len);
2562 }
2563
2564 rtnl_lock();
2565 /* Remember the original table */
2566 old = rtnl_dereference(net->mpls.platform_label);
2567 old_limit = net->mpls.platform_labels;
2568
2569 /* Free any labels beyond the new table */
2570 for (index = limit; index < old_limit; index++)
2571 mpls_route_update(net, index, NULL, NULL);
2572
2573 /* Copy over the old labels */
2574 cp_size = size;
2575 if (old_limit < limit)
2576 cp_size = old_limit * sizeof(struct mpls_route *);
2577
2578 memcpy(labels, old, cp_size);
2579
2580 /* If needed set the predefined labels */
2581 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2582 (limit > MPLS_LABEL_IPV6NULL)) {
2583 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2584 rt2 = NULL;
2585 }
2586
2587 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2588 (limit > MPLS_LABEL_IPV4NULL)) {
2589 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2590 rt0 = NULL;
2591 }
2592
2593 /* Update the global pointers */
2594 net->mpls.platform_labels = limit;
2595 rcu_assign_pointer(net->mpls.platform_label, labels);
2596
2597 rtnl_unlock();
2598
2599 mpls_rt_free(rt2);
2600 mpls_rt_free(rt0);
2601
2602 if (old) {
2603 synchronize_rcu();
2604 kvfree(old);
2605 }
2606 return 0;
2607
2608nort2:
2609 mpls_rt_free(rt0);
2610nort0:
2611 kvfree(labels);
2612nolabels:
2613 return -ENOMEM;
2614}
2615
2616static int mpls_platform_labels(struct ctl_table *table, int write,
2617 void *buffer, size_t *lenp, loff_t *ppos)
2618{
2619 struct net *net = table->data;
2620 int platform_labels = net->mpls.platform_labels;
2621 int ret;
2622 struct ctl_table tmp = {
2623 .procname = table->procname,
2624 .data = &platform_labels,
2625 .maxlen = sizeof(int),
2626 .mode = table->mode,
2627 .extra1 = SYSCTL_ZERO,
2628 .extra2 = &label_limit,
2629 };
2630
2631 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2632
2633 if (write && ret == 0)
2634 ret = resize_platform_label_table(net, platform_labels);
2635
2636 return ret;
2637}
2638
2639#define MPLS_NS_SYSCTL_OFFSET(field) \
2640 (&((struct net *)0)->field)
2641
2642static const struct ctl_table mpls_table[] = {
2643 {
2644 .procname = "platform_labels",
2645 .data = NULL,
2646 .maxlen = sizeof(int),
2647 .mode = 0644,
2648 .proc_handler = mpls_platform_labels,
2649 },
2650 {
2651 .procname = "ip_ttl_propagate",
2652 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2653 .maxlen = sizeof(int),
2654 .mode = 0644,
2655 .proc_handler = proc_dointvec_minmax,
2656 .extra1 = SYSCTL_ZERO,
2657 .extra2 = SYSCTL_ONE,
2658 },
2659 {
2660 .procname = "default_ttl",
2661 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2662 .maxlen = sizeof(int),
2663 .mode = 0644,
2664 .proc_handler = proc_dointvec_minmax,
2665 .extra1 = SYSCTL_ONE,
2666 .extra2 = &ttl_max,
2667 },
2668 { }
2669};
2670
2671static int mpls_net_init(struct net *net)
2672{
2673 struct ctl_table *table;
2674 int i;
2675
2676 net->mpls.platform_labels = 0;
2677 net->mpls.platform_label = NULL;
2678 net->mpls.ip_ttl_propagate = 1;
2679 net->mpls.default_ttl = 255;
2680
2681 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2682 if (table == NULL)
2683 return -ENOMEM;
2684
2685 /* Table data contains only offsets relative to the base of
2686 * the mdev at this point, so make them absolute.
2687 */
2688 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2689 table[i].data = (char *)net + (uintptr_t)table[i].data;
2690
2691 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
2692 if (net->mpls.ctl == NULL) {
2693 kfree(table);
2694 return -ENOMEM;
2695 }
2696
2697 return 0;
2698}
2699
2700static void mpls_net_exit(struct net *net)
2701{
2702 struct mpls_route __rcu **platform_label;
2703 size_t platform_labels;
2704 struct ctl_table *table;
2705 unsigned int index;
2706
2707 table = net->mpls.ctl->ctl_table_arg;
2708 unregister_net_sysctl_table(net->mpls.ctl);
2709 kfree(table);
2710
2711 /* An rcu grace period has passed since there was a device in
2712 * the network namespace (and thus the last in flight packet)
2713 * left this network namespace. This is because
2714 * unregister_netdevice_many and netdev_run_todo has completed
2715 * for each network device that was in this network namespace.
2716 *
2717 * As such no additional rcu synchronization is necessary when
2718 * freeing the platform_label table.
2719 */
2720 rtnl_lock();
2721 platform_label = rtnl_dereference(net->mpls.platform_label);
2722 platform_labels = net->mpls.platform_labels;
2723 for (index = 0; index < platform_labels; index++) {
2724 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2725 RCU_INIT_POINTER(platform_label[index], NULL);
2726 mpls_notify_route(net, index, rt, NULL, NULL);
2727 mpls_rt_free(rt);
2728 }
2729 rtnl_unlock();
2730
2731 kvfree(platform_label);
2732}
2733
2734static struct pernet_operations mpls_net_ops = {
2735 .init = mpls_net_init,
2736 .exit = mpls_net_exit,
2737};
2738
2739static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2740 .family = AF_MPLS,
2741 .fill_stats_af = mpls_fill_stats_af,
2742 .get_stats_af_size = mpls_get_stats_af_size,
2743};
2744
2745static int __init mpls_init(void)
2746{
2747 int err;
2748
2749 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2750
2751 err = register_pernet_subsys(&mpls_net_ops);
2752 if (err)
2753 goto out;
2754
2755 err = register_netdevice_notifier(&mpls_dev_notifier);
2756 if (err)
2757 goto out_unregister_pernet;
2758
2759 dev_add_pack(&mpls_packet_type);
2760
2761 rtnl_af_register(&mpls_af_ops);
2762
2763 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2764 mpls_rtm_newroute, NULL, 0);
2765 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2766 mpls_rtm_delroute, NULL, 0);
2767 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2768 mpls_getroute, mpls_dump_routes, 0);
2769 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2770 mpls_netconf_get_devconf,
2771 mpls_netconf_dump_devconf, 0);
2772 err = ipgre_tunnel_encap_add_mpls_ops();
2773 if (err)
2774 pr_err("Can't add mpls over gre tunnel ops\n");
2775
2776 err = 0;
2777out:
2778 return err;
2779
2780out_unregister_pernet:
2781 unregister_pernet_subsys(&mpls_net_ops);
2782 goto out;
2783}
2784module_init(mpls_init);
2785
2786static void __exit mpls_exit(void)
2787{
2788 rtnl_unregister_all(PF_MPLS);
2789 rtnl_af_unregister(&mpls_af_ops);
2790 dev_remove_pack(&mpls_packet_type);
2791 unregister_netdevice_notifier(&mpls_dev_notifier);
2792 unregister_pernet_subsys(&mpls_net_ops);
2793 ipgre_tunnel_encap_del_mpls_ops();
2794}
2795module_exit(mpls_exit);
2796
2797MODULE_DESCRIPTION("MultiProtocol Label Switching");
2798MODULE_LICENSE("GPL v2");
2799MODULE_ALIAS_NETPROTO(PF_MPLS);