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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / mpls / af_mpls.c
blob47bab701555feaa1fdbeefe049918f377c62d501
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
40 static int label_limit = (1 << 20) - 1;
41 static int ttl_max = 255;
42
43 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
44 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
45 {
46 return sizeof(struct mpls_shim_hdr);
47 }
48
49 static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
50 .encap_hlen = ipgre_mpls_encap_hlen,
51 };
52
53 static int ipgre_tunnel_encap_add_mpls_ops(void)
54 {
55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
56 }
57
58 static void ipgre_tunnel_encap_del_mpls_ops(void)
59 {
60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
61 }
62 #else
63 static int ipgre_tunnel_encap_add_mpls_ops(void)
64 {
65 return 0;
66 }
67
68 static void ipgre_tunnel_encap_del_mpls_ops(void)
69 {
70 }
71 #endif
72
73 static 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
77 static 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
89 bool mpls_output_possible(const struct net_device *dev)
90 {
91 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
92 }
93 EXPORT_SYMBOL_GPL(mpls_output_possible);
94
95 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
96 {
97 return (u8 *)nh + rt->rt_via_offset;
98 }
99
100 static 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
106 static 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
112 unsigned 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 }
117 EXPORT_SYMBOL_GPL(mpls_dev_mtu);
118
119 bool 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 }
129 EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
130
131 void 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 }
154 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
155
156 static 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
223 static 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 */
233 static 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
265 out:
266 return mpls_get_nexthop(rt, nh_index);
267 }
268
269 static 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
341 static 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 struct mpls_route *rt;
347 struct mpls_nh *nh;
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 dec.ttl -= 1;
411
412 /* Find the output device */
413 out_dev = rcu_dereference(nh->nh_dev);
414 if (!mpls_output_possible(out_dev))
415 goto tx_err;
416
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))
421 goto tx_err;
422
423 hh_len = LL_RESERVED_SPACE(out_dev);
424 if (!out_dev->header_ops)
425 hh_len = 0;
426
427 /* Ensure there is enough space for the headers in the skb */
428 if (skb_cow(skb, hh_len + new_header_size))
429 goto tx_err;
430
431 skb->dev = out_dev;
432 skb->protocol = htons(ETH_P_MPLS_UC);
433
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
467 tx_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;
472 err:
473 MPLS_INC_STATS(mdev, rx_errors);
474 drop:
475 kfree_skb(skb);
476 return NET_RX_DROP;
477 }
478
479 static struct packet_type mpls_packet_type __read_mostly = {
480 .type = cpu_to_be16(ETH_P_MPLS_UC),
481 .func = mpls_forward,
482 };
483
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 },
488 };
489
490 struct 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 */
510 static 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
532 static void mpls_rt_free(struct mpls_route *rt)
533 {
534 if (rt)
535 kfree_rcu(rt, rt_rcu);
536 }
537
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)
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
552 static 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
571 static 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)
588 static 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
608 static 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)
616 static 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
639 static struct net_device *inet6_fib_lookup_dev(struct net *net,
640 const void *addr)
641 {
642 return ERR_PTR(-EAFNOSUPPORT);
643 }
644 #endif
645
646 static 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
679 static 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 RCU_INIT_POINTER(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
715 errout:
716 return err;
717 }
718
719 static 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
763 errout:
764 return err;
765 }
766
767 static 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
795 errout:
796 return err;
797 }
798
799 static 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
831 errout:
832 return err;
833 }
834
835 static 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
884 static 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
935 errout:
936 return err;
937 }
938
939 static 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
962 static 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 err = -ENOMEM;
1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1024 if (IS_ERR(rt)) {
1025 err = PTR_ERR(rt);
1026 goto errout;
1027 }
1028
1029 rt->rt_protocol = cfg->rc_protocol;
1030 rt->rt_payload_type = cfg->rc_payload_type;
1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1032
1033 if (cfg->rc_mp)
1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1035 else
1036 err = mpls_nh_build_from_cfg(cfg, rt);
1037 if (err)
1038 goto freert;
1039
1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1041
1042 return 0;
1043
1044 freert:
1045 mpls_rt_free(rt);
1046 errout:
1047 return err;
1048 }
1049
1050 static int mpls_route_del(struct mpls_route_config *cfg,
1051 struct netlink_ext_ack *extack)
1052 {
1053 struct net *net = cfg->rc_nlinfo.nl_net;
1054 unsigned index;
1055 int err = -EINVAL;
1056
1057 index = cfg->rc_label;
1058
1059 if (!mpls_label_ok(net, &index, extack))
1060 goto errout;
1061
1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1063
1064 err = 0;
1065 errout:
1066 return err;
1067 }
1068
1069 static void mpls_get_stats(struct mpls_dev *mdev,
1070 struct mpls_link_stats *stats)
1071 {
1072 struct mpls_pcpu_stats *p;
1073 int i;
1074
1075 memset(stats, 0, sizeof(*stats));
1076
1077 for_each_possible_cpu(i) {
1078 struct mpls_link_stats local;
1079 unsigned int start;
1080
1081 p = per_cpu_ptr(mdev->stats, i);
1082 do {
1083 start = u64_stats_fetch_begin(&p->syncp);
1084 local = p->stats;
1085 } while (u64_stats_fetch_retry(&p->syncp, start));
1086
1087 stats->rx_packets += local.rx_packets;
1088 stats->rx_bytes += local.rx_bytes;
1089 stats->tx_packets += local.tx_packets;
1090 stats->tx_bytes += local.tx_bytes;
1091 stats->rx_errors += local.rx_errors;
1092 stats->tx_errors += local.tx_errors;
1093 stats->rx_dropped += local.rx_dropped;
1094 stats->tx_dropped += local.tx_dropped;
1095 stats->rx_noroute += local.rx_noroute;
1096 }
1097 }
1098
1099 static int mpls_fill_stats_af(struct sk_buff *skb,
1100 const struct net_device *dev)
1101 {
1102 struct mpls_link_stats *stats;
1103 struct mpls_dev *mdev;
1104 struct nlattr *nla;
1105
1106 mdev = mpls_dev_get(dev);
1107 if (!mdev)
1108 return -ENODATA;
1109
1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1111 sizeof(struct mpls_link_stats),
1112 MPLS_STATS_UNSPEC);
1113 if (!nla)
1114 return -EMSGSIZE;
1115
1116 stats = nla_data(nla);
1117 mpls_get_stats(mdev, stats);
1118
1119 return 0;
1120 }
1121
1122 static size_t mpls_get_stats_af_size(const struct net_device *dev)
1123 {
1124 struct mpls_dev *mdev;
1125
1126 mdev = mpls_dev_get(dev);
1127 if (!mdev)
1128 return 0;
1129
1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1131 }
1132
1133 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1134 u32 portid, u32 seq, int event,
1135 unsigned int flags, int type)
1136 {
1137 struct nlmsghdr *nlh;
1138 struct netconfmsg *ncm;
1139 bool all = false;
1140
1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1142 flags);
1143 if (!nlh)
1144 return -EMSGSIZE;
1145
1146 if (type == NETCONFA_ALL)
1147 all = true;
1148
1149 ncm = nlmsg_data(nlh);
1150 ncm->ncm_family = AF_MPLS;
1151
1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1153 goto nla_put_failure;
1154
1155 if ((all || type == NETCONFA_INPUT) &&
1156 nla_put_s32(skb, NETCONFA_INPUT,
1157 mdev->input_enabled) < 0)
1158 goto nla_put_failure;
1159
1160 nlmsg_end(skb, nlh);
1161 return 0;
1162
1163 nla_put_failure:
1164 nlmsg_cancel(skb, nlh);
1165 return -EMSGSIZE;
1166 }
1167
1168 static int mpls_netconf_msgsize_devconf(int type)
1169 {
1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1171 + nla_total_size(4); /* NETCONFA_IFINDEX */
1172 bool all = false;
1173
1174 if (type == NETCONFA_ALL)
1175 all = true;
1176
1177 if (all || type == NETCONFA_INPUT)
1178 size += nla_total_size(4);
1179
1180 return size;
1181 }
1182
1183 static void mpls_netconf_notify_devconf(struct net *net, int event,
1184 int type, struct mpls_dev *mdev)
1185 {
1186 struct sk_buff *skb;
1187 int err = -ENOBUFS;
1188
1189 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1190 if (!skb)
1191 goto errout;
1192
1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1194 if (err < 0) {
1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1196 WARN_ON(err == -EMSGSIZE);
1197 kfree_skb(skb);
1198 goto errout;
1199 }
1200
1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1202 return;
1203 errout:
1204 if (err < 0)
1205 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1206 }
1207
1208 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1209 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1210 };
1211
1212 static int mpls_netconf_valid_get_req(struct sk_buff *skb,
1213 const struct nlmsghdr *nlh,
1214 struct nlattr **tb,
1215 struct netlink_ext_ack *extack)
1216 {
1217 int i, err;
1218
1219 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
1220 NL_SET_ERR_MSG_MOD(extack,
1221 "Invalid header for netconf get request");
1222 return -EINVAL;
1223 }
1224
1225 if (!netlink_strict_get_check(skb))
1226 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
1227 tb, NETCONFA_MAX,
1228 devconf_mpls_policy, extack);
1229
1230 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
1231 tb, NETCONFA_MAX,
1232 devconf_mpls_policy, extack);
1233 if (err)
1234 return err;
1235
1236 for (i = 0; i <= NETCONFA_MAX; i++) {
1237 if (!tb[i])
1238 continue;
1239
1240 switch (i) {
1241 case NETCONFA_IFINDEX:
1242 break;
1243 default:
1244 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
1245 return -EINVAL;
1246 }
1247 }
1248
1249 return 0;
1250 }
1251
1252 static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1253 struct nlmsghdr *nlh,
1254 struct netlink_ext_ack *extack)
1255 {
1256 struct net *net = sock_net(in_skb->sk);
1257 struct nlattr *tb[NETCONFA_MAX + 1];
1258 struct net_device *dev;
1259 struct mpls_dev *mdev;
1260 struct sk_buff *skb;
1261 int ifindex;
1262 int err;
1263
1264 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
1265 if (err < 0)
1266 goto errout;
1267
1268 err = -EINVAL;
1269 if (!tb[NETCONFA_IFINDEX])
1270 goto errout;
1271
1272 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1273 dev = __dev_get_by_index(net, ifindex);
1274 if (!dev)
1275 goto errout;
1276
1277 mdev = mpls_dev_get(dev);
1278 if (!mdev)
1279 goto errout;
1280
1281 err = -ENOBUFS;
1282 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1283 if (!skb)
1284 goto errout;
1285
1286 err = mpls_netconf_fill_devconf(skb, mdev,
1287 NETLINK_CB(in_skb).portid,
1288 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1289 NETCONFA_ALL);
1290 if (err < 0) {
1291 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1292 WARN_ON(err == -EMSGSIZE);
1293 kfree_skb(skb);
1294 goto errout;
1295 }
1296 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1297 errout:
1298 return err;
1299 }
1300
1301 static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1302 struct netlink_callback *cb)
1303 {
1304 const struct nlmsghdr *nlh = cb->nlh;
1305 struct net *net = sock_net(skb->sk);
1306 struct hlist_head *head;
1307 struct net_device *dev;
1308 struct mpls_dev *mdev;
1309 int idx, s_idx;
1310 int h, s_h;
1311
1312 if (cb->strict_check) {
1313 struct netlink_ext_ack *extack = cb->extack;
1314 struct netconfmsg *ncm;
1315
1316 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1317 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1318 return -EINVAL;
1319 }
1320
1321 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1322 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1323 return -EINVAL;
1324 }
1325 }
1326
1327 s_h = cb->args[0];
1328 s_idx = idx = cb->args[1];
1329
1330 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1331 idx = 0;
1332 head = &net->dev_index_head[h];
1333 rcu_read_lock();
1334 cb->seq = net->dev_base_seq;
1335 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1336 if (idx < s_idx)
1337 goto cont;
1338 mdev = mpls_dev_get(dev);
1339 if (!mdev)
1340 goto cont;
1341 if (mpls_netconf_fill_devconf(skb, mdev,
1342 NETLINK_CB(cb->skb).portid,
1343 nlh->nlmsg_seq,
1344 RTM_NEWNETCONF,
1345 NLM_F_MULTI,
1346 NETCONFA_ALL) < 0) {
1347 rcu_read_unlock();
1348 goto done;
1349 }
1350 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1351 cont:
1352 idx++;
1353 }
1354 rcu_read_unlock();
1355 }
1356 done:
1357 cb->args[0] = h;
1358 cb->args[1] = idx;
1359
1360 return skb->len;
1361 }
1362
1363 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1364 (&((struct mpls_dev *)0)->field)
1365
1366 static int mpls_conf_proc(struct ctl_table *ctl, int write,
1367 void *buffer, size_t *lenp, loff_t *ppos)
1368 {
1369 int oval = *(int *)ctl->data;
1370 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1371
1372 if (write) {
1373 struct mpls_dev *mdev = ctl->extra1;
1374 int i = (int *)ctl->data - (int *)mdev;
1375 struct net *net = ctl->extra2;
1376 int val = *(int *)ctl->data;
1377
1378 if (i == offsetof(struct mpls_dev, input_enabled) &&
1379 val != oval) {
1380 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1381 NETCONFA_INPUT, mdev);
1382 }
1383 }
1384
1385 return ret;
1386 }
1387
1388 static const struct ctl_table mpls_dev_table[] = {
1389 {
1390 .procname = "input",
1391 .maxlen = sizeof(int),
1392 .mode = 0644,
1393 .proc_handler = mpls_conf_proc,
1394 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1395 },
1396 { }
1397 };
1398
1399 static int mpls_dev_sysctl_register(struct net_device *dev,
1400 struct mpls_dev *mdev)
1401 {
1402 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1403 struct net *net = dev_net(dev);
1404 struct ctl_table *table;
1405 int i;
1406
1407 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1408 if (!table)
1409 goto out;
1410
1411 /* Table data contains only offsets relative to the base of
1412 * the mdev at this point, so make them absolute.
1413 */
1414 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
1415 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1416 table[i].extra1 = mdev;
1417 table[i].extra2 = net;
1418 }
1419
1420 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1421
1422 mdev->sysctl = register_net_sysctl(net, path, table);
1423 if (!mdev->sysctl)
1424 goto free;
1425
1426 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1427 return 0;
1428
1429 free:
1430 kfree(table);
1431 out:
1432 return -ENOBUFS;
1433 }
1434
1435 static 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 table = mdev->sysctl->ctl_table_arg;
1442 unregister_net_sysctl_table(mdev->sysctl);
1443 kfree(table);
1444
1445 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1446 }
1447
1448 static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1449 {
1450 struct mpls_dev *mdev;
1451 int err = -ENOMEM;
1452 int i;
1453
1454 ASSERT_RTNL();
1455
1456 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1457 if (!mdev)
1458 return ERR_PTR(err);
1459
1460 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1461 if (!mdev->stats)
1462 goto free;
1463
1464 for_each_possible_cpu(i) {
1465 struct mpls_pcpu_stats *mpls_stats;
1466
1467 mpls_stats = per_cpu_ptr(mdev->stats, i);
1468 u64_stats_init(&mpls_stats->syncp);
1469 }
1470
1471 mdev->dev = dev;
1472
1473 err = mpls_dev_sysctl_register(dev, mdev);
1474 if (err)
1475 goto free;
1476
1477 rcu_assign_pointer(dev->mpls_ptr, mdev);
1478
1479 return mdev;
1480
1481 free:
1482 free_percpu(mdev->stats);
1483 kfree(mdev);
1484 return ERR_PTR(err);
1485 }
1486
1487 static void mpls_dev_destroy_rcu(struct rcu_head *head)
1488 {
1489 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1490
1491 free_percpu(mdev->stats);
1492 kfree(mdev);
1493 }
1494
1495 static void mpls_ifdown(struct net_device *dev, int event)
1496 {
1497 struct mpls_route __rcu **platform_label;
1498 struct net *net = dev_net(dev);
1499 u8 alive, deleted;
1500 unsigned index;
1501
1502 platform_label = rtnl_dereference(net->mpls.platform_label);
1503 for (index = 0; index < net->mpls.platform_labels; index++) {
1504 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1505
1506 if (!rt)
1507 continue;
1508
1509 alive = 0;
1510 deleted = 0;
1511 change_nexthops(rt) {
1512 unsigned int nh_flags = nh->nh_flags;
1513
1514 if (rtnl_dereference(nh->nh_dev) != dev)
1515 goto next;
1516
1517 switch (event) {
1518 case NETDEV_DOWN:
1519 case NETDEV_UNREGISTER:
1520 nh_flags |= RTNH_F_DEAD;
1521 fallthrough;
1522 case NETDEV_CHANGE:
1523 nh_flags |= RTNH_F_LINKDOWN;
1524 break;
1525 }
1526 if (event == NETDEV_UNREGISTER)
1527 RCU_INIT_POINTER(nh->nh_dev, NULL);
1528
1529 if (nh->nh_flags != nh_flags)
1530 WRITE_ONCE(nh->nh_flags, nh_flags);
1531 next:
1532 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1533 alive++;
1534 if (!rtnl_dereference(nh->nh_dev))
1535 deleted++;
1536 } endfor_nexthops(rt);
1537
1538 WRITE_ONCE(rt->rt_nhn_alive, alive);
1539
1540 /* if there are no more nexthops, delete the route */
1541 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
1542 mpls_route_update(net, index, NULL, NULL);
1543 }
1544 }
1545
1546 static void mpls_ifup(struct net_device *dev, unsigned int flags)
1547 {
1548 struct mpls_route __rcu **platform_label;
1549 struct net *net = dev_net(dev);
1550 unsigned index;
1551 u8 alive;
1552
1553 platform_label = rtnl_dereference(net->mpls.platform_label);
1554 for (index = 0; index < net->mpls.platform_labels; index++) {
1555 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1556
1557 if (!rt)
1558 continue;
1559
1560 alive = 0;
1561 change_nexthops(rt) {
1562 unsigned int nh_flags = nh->nh_flags;
1563 struct net_device *nh_dev =
1564 rtnl_dereference(nh->nh_dev);
1565
1566 if (!(nh_flags & flags)) {
1567 alive++;
1568 continue;
1569 }
1570 if (nh_dev != dev)
1571 continue;
1572 alive++;
1573 nh_flags &= ~flags;
1574 WRITE_ONCE(nh->nh_flags, nh_flags);
1575 } endfor_nexthops(rt);
1576
1577 WRITE_ONCE(rt->rt_nhn_alive, alive);
1578 }
1579 }
1580
1581 static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1582 void *ptr)
1583 {
1584 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1585 struct mpls_dev *mdev;
1586 unsigned int flags;
1587
1588 if (event == NETDEV_REGISTER) {
1589 mdev = mpls_add_dev(dev);
1590 if (IS_ERR(mdev))
1591 return notifier_from_errno(PTR_ERR(mdev));
1592
1593 return NOTIFY_OK;
1594 }
1595
1596 mdev = mpls_dev_get(dev);
1597 if (!mdev)
1598 return NOTIFY_OK;
1599
1600 switch (event) {
1601 case NETDEV_DOWN:
1602 mpls_ifdown(dev, event);
1603 break;
1604 case NETDEV_UP:
1605 flags = dev_get_flags(dev);
1606 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1607 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1608 else
1609 mpls_ifup(dev, RTNH_F_DEAD);
1610 break;
1611 case NETDEV_CHANGE:
1612 flags = dev_get_flags(dev);
1613 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1614 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1615 else
1616 mpls_ifdown(dev, event);
1617 break;
1618 case NETDEV_UNREGISTER:
1619 mpls_ifdown(dev, event);
1620 mdev = mpls_dev_get(dev);
1621 if (mdev) {
1622 mpls_dev_sysctl_unregister(dev, mdev);
1623 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1624 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1625 }
1626 break;
1627 case NETDEV_CHANGENAME:
1628 mdev = mpls_dev_get(dev);
1629 if (mdev) {
1630 int err;
1631
1632 mpls_dev_sysctl_unregister(dev, mdev);
1633 err = mpls_dev_sysctl_register(dev, mdev);
1634 if (err)
1635 return notifier_from_errno(err);
1636 }
1637 break;
1638 }
1639 return NOTIFY_OK;
1640 }
1641
1642 static struct notifier_block mpls_dev_notifier = {
1643 .notifier_call = mpls_dev_notify,
1644 };
1645
1646 static int nla_put_via(struct sk_buff *skb,
1647 u8 table, const void *addr, int alen)
1648 {
1649 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1650 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1651 };
1652 struct nlattr *nla;
1653 struct rtvia *via;
1654 int family = AF_UNSPEC;
1655
1656 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1657 if (!nla)
1658 return -EMSGSIZE;
1659
1660 if (table <= NEIGH_NR_TABLES)
1661 family = table_to_family[table];
1662
1663 via = nla_data(nla);
1664 via->rtvia_family = family;
1665 memcpy(via->rtvia_addr, addr, alen);
1666 return 0;
1667 }
1668
1669 int nla_put_labels(struct sk_buff *skb, int attrtype,
1670 u8 labels, const u32 label[])
1671 {
1672 struct nlattr *nla;
1673 struct mpls_shim_hdr *nla_label;
1674 bool bos;
1675 int i;
1676 nla = nla_reserve(skb, attrtype, labels*4);
1677 if (!nla)
1678 return -EMSGSIZE;
1679
1680 nla_label = nla_data(nla);
1681 bos = true;
1682 for (i = labels - 1; i >= 0; i--) {
1683 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1684 bos = false;
1685 }
1686
1687 return 0;
1688 }
1689 EXPORT_SYMBOL_GPL(nla_put_labels);
1690
1691 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1692 u32 label[], struct netlink_ext_ack *extack)
1693 {
1694 unsigned len = nla_len(nla);
1695 struct mpls_shim_hdr *nla_label;
1696 u8 nla_labels;
1697 bool bos;
1698 int i;
1699
1700 /* len needs to be an even multiple of 4 (the label size). Number
1701 * of labels is a u8 so check for overflow.
1702 */
1703 if (len & 3 || len / 4 > 255) {
1704 NL_SET_ERR_MSG_ATTR(extack, nla,
1705 "Invalid length for labels attribute");
1706 return -EINVAL;
1707 }
1708
1709 /* Limit the number of new labels allowed */
1710 nla_labels = len/4;
1711 if (nla_labels > max_labels) {
1712 NL_SET_ERR_MSG(extack, "Too many labels");
1713 return -EINVAL;
1714 }
1715
1716 /* when label == NULL, caller wants number of labels */
1717 if (!label)
1718 goto out;
1719
1720 nla_label = nla_data(nla);
1721 bos = true;
1722 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1723 struct mpls_entry_decoded dec;
1724 dec = mpls_entry_decode(nla_label + i);
1725
1726 /* Ensure the bottom of stack flag is properly set
1727 * and ttl and tc are both clear.
1728 */
1729 if (dec.ttl) {
1730 NL_SET_ERR_MSG_ATTR(extack, nla,
1731 "TTL in label must be 0");
1732 return -EINVAL;
1733 }
1734
1735 if (dec.tc) {
1736 NL_SET_ERR_MSG_ATTR(extack, nla,
1737 "Traffic class in label must be 0");
1738 return -EINVAL;
1739 }
1740
1741 if (dec.bos != bos) {
1742 NL_SET_BAD_ATTR(extack, nla);
1743 if (bos) {
1744 NL_SET_ERR_MSG(extack,
1745 "BOS bit must be set in first label");
1746 } else {
1747 NL_SET_ERR_MSG(extack,
1748 "BOS bit can only be set in first label");
1749 }
1750 return -EINVAL;
1751 }
1752
1753 switch (dec.label) {
1754 case MPLS_LABEL_IMPLNULL:
1755 /* RFC3032: This is a label that an LSR may
1756 * assign and distribute, but which never
1757 * actually appears in the encapsulation.
1758 */
1759 NL_SET_ERR_MSG_ATTR(extack, nla,
1760 "Implicit NULL Label (3) can not be used in encapsulation");
1761 return -EINVAL;
1762 }
1763
1764 label[i] = dec.label;
1765 }
1766 out:
1767 *labels = nla_labels;
1768 return 0;
1769 }
1770 EXPORT_SYMBOL_GPL(nla_get_labels);
1771
1772 static int rtm_to_route_config(struct sk_buff *skb,
1773 struct nlmsghdr *nlh,
1774 struct mpls_route_config *cfg,
1775 struct netlink_ext_ack *extack)
1776 {
1777 struct rtmsg *rtm;
1778 struct nlattr *tb[RTA_MAX+1];
1779 int index;
1780 int err;
1781
1782 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1783 rtm_mpls_policy, extack);
1784 if (err < 0)
1785 goto errout;
1786
1787 err = -EINVAL;
1788 rtm = nlmsg_data(nlh);
1789
1790 if (rtm->rtm_family != AF_MPLS) {
1791 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1792 goto errout;
1793 }
1794 if (rtm->rtm_dst_len != 20) {
1795 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1796 goto errout;
1797 }
1798 if (rtm->rtm_src_len != 0) {
1799 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1800 goto errout;
1801 }
1802 if (rtm->rtm_tos != 0) {
1803 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1804 goto errout;
1805 }
1806 if (rtm->rtm_table != RT_TABLE_MAIN) {
1807 NL_SET_ERR_MSG(extack,
1808 "MPLS only supports the main route table");
1809 goto errout;
1810 }
1811 /* Any value is acceptable for rtm_protocol */
1812
1813 /* As mpls uses destination specific addresses
1814 * (or source specific address in the case of multicast)
1815 * all addresses have universal scope.
1816 */
1817 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1818 NL_SET_ERR_MSG(extack,
1819 "Invalid route scope - MPLS only supports UNIVERSE");
1820 goto errout;
1821 }
1822 if (rtm->rtm_type != RTN_UNICAST) {
1823 NL_SET_ERR_MSG(extack,
1824 "Invalid route type - MPLS only supports UNICAST");
1825 goto errout;
1826 }
1827 if (rtm->rtm_flags != 0) {
1828 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1829 goto errout;
1830 }
1831
1832 cfg->rc_label = LABEL_NOT_SPECIFIED;
1833 cfg->rc_protocol = rtm->rtm_protocol;
1834 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1835 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1836 cfg->rc_nlflags = nlh->nlmsg_flags;
1837 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1838 cfg->rc_nlinfo.nlh = nlh;
1839 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1840
1841 for (index = 0; index <= RTA_MAX; index++) {
1842 struct nlattr *nla = tb[index];
1843 if (!nla)
1844 continue;
1845
1846 switch (index) {
1847 case RTA_OIF:
1848 cfg->rc_ifindex = nla_get_u32(nla);
1849 break;
1850 case RTA_NEWDST:
1851 if (nla_get_labels(nla, MAX_NEW_LABELS,
1852 &cfg->rc_output_labels,
1853 cfg->rc_output_label, extack))
1854 goto errout;
1855 break;
1856 case RTA_DST:
1857 {
1858 u8 label_count;
1859 if (nla_get_labels(nla, 1, &label_count,
1860 &cfg->rc_label, extack))
1861 goto errout;
1862
1863 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1864 &cfg->rc_label, extack))
1865 goto errout;
1866 break;
1867 }
1868 case RTA_GATEWAY:
1869 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
1870 goto errout;
1871 case RTA_VIA:
1872 {
1873 if (nla_get_via(nla, &cfg->rc_via_alen,
1874 &cfg->rc_via_table, cfg->rc_via,
1875 extack))
1876 goto errout;
1877 break;
1878 }
1879 case RTA_MULTIPATH:
1880 {
1881 cfg->rc_mp = nla_data(nla);
1882 cfg->rc_mp_len = nla_len(nla);
1883 break;
1884 }
1885 case RTA_TTL_PROPAGATE:
1886 {
1887 u8 ttl_propagate = nla_get_u8(nla);
1888
1889 if (ttl_propagate > 1) {
1890 NL_SET_ERR_MSG_ATTR(extack, nla,
1891 "RTA_TTL_PROPAGATE can only be 0 or 1");
1892 goto errout;
1893 }
1894 cfg->rc_ttl_propagate = ttl_propagate ?
1895 MPLS_TTL_PROP_ENABLED :
1896 MPLS_TTL_PROP_DISABLED;
1897 break;
1898 }
1899 default:
1900 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1901 /* Unsupported attribute */
1902 goto errout;
1903 }
1904 }
1905
1906 err = 0;
1907 errout:
1908 return err;
1909 }
1910
1911 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1912 struct netlink_ext_ack *extack)
1913 {
1914 struct mpls_route_config *cfg;
1915 int err;
1916
1917 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1918 if (!cfg)
1919 return -ENOMEM;
1920
1921 err = rtm_to_route_config(skb, nlh, cfg, extack);
1922 if (err < 0)
1923 goto out;
1924
1925 err = mpls_route_del(cfg, extack);
1926 out:
1927 kfree(cfg);
1928
1929 return err;
1930 }
1931
1932
1933 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1934 struct netlink_ext_ack *extack)
1935 {
1936 struct mpls_route_config *cfg;
1937 int err;
1938
1939 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1940 if (!cfg)
1941 return -ENOMEM;
1942
1943 err = rtm_to_route_config(skb, nlh, cfg, extack);
1944 if (err < 0)
1945 goto out;
1946
1947 err = mpls_route_add(cfg, extack);
1948 out:
1949 kfree(cfg);
1950
1951 return err;
1952 }
1953
1954 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1955 u32 label, struct mpls_route *rt, int flags)
1956 {
1957 struct net_device *dev;
1958 struct nlmsghdr *nlh;
1959 struct rtmsg *rtm;
1960
1961 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1962 if (nlh == NULL)
1963 return -EMSGSIZE;
1964
1965 rtm = nlmsg_data(nlh);
1966 rtm->rtm_family = AF_MPLS;
1967 rtm->rtm_dst_len = 20;
1968 rtm->rtm_src_len = 0;
1969 rtm->rtm_tos = 0;
1970 rtm->rtm_table = RT_TABLE_MAIN;
1971 rtm->rtm_protocol = rt->rt_protocol;
1972 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1973 rtm->rtm_type = RTN_UNICAST;
1974 rtm->rtm_flags = 0;
1975
1976 if (nla_put_labels(skb, RTA_DST, 1, &label))
1977 goto nla_put_failure;
1978
1979 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1980 bool ttl_propagate =
1981 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1982
1983 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
1984 ttl_propagate))
1985 goto nla_put_failure;
1986 }
1987 if (rt->rt_nhn == 1) {
1988 const struct mpls_nh *nh = rt->rt_nh;
1989
1990 if (nh->nh_labels &&
1991 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
1992 nh->nh_label))
1993 goto nla_put_failure;
1994 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1995 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
1996 nh->nh_via_alen))
1997 goto nla_put_failure;
1998 dev = rtnl_dereference(nh->nh_dev);
1999 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2000 goto nla_put_failure;
2001 if (nh->nh_flags & RTNH_F_LINKDOWN)
2002 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2003 if (nh->nh_flags & RTNH_F_DEAD)
2004 rtm->rtm_flags |= RTNH_F_DEAD;
2005 } else {
2006 struct rtnexthop *rtnh;
2007 struct nlattr *mp;
2008 u8 linkdown = 0;
2009 u8 dead = 0;
2010
2011 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
2012 if (!mp)
2013 goto nla_put_failure;
2014
2015 for_nexthops(rt) {
2016 dev = rtnl_dereference(nh->nh_dev);
2017 if (!dev)
2018 continue;
2019
2020 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
2021 if (!rtnh)
2022 goto nla_put_failure;
2023
2024 rtnh->rtnh_ifindex = dev->ifindex;
2025 if (nh->nh_flags & RTNH_F_LINKDOWN) {
2026 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
2027 linkdown++;
2028 }
2029 if (nh->nh_flags & RTNH_F_DEAD) {
2030 rtnh->rtnh_flags |= RTNH_F_DEAD;
2031 dead++;
2032 }
2033
2034 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2035 nh->nh_labels,
2036 nh->nh_label))
2037 goto nla_put_failure;
2038 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2039 nla_put_via(skb, nh->nh_via_table,
2040 mpls_nh_via(rt, nh),
2041 nh->nh_via_alen))
2042 goto nla_put_failure;
2043
2044 /* length of rtnetlink header + attributes */
2045 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2046 } endfor_nexthops(rt);
2047
2048 if (linkdown == rt->rt_nhn)
2049 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2050 if (dead == rt->rt_nhn)
2051 rtm->rtm_flags |= RTNH_F_DEAD;
2052
2053 nla_nest_end(skb, mp);
2054 }
2055
2056 nlmsg_end(skb, nlh);
2057 return 0;
2058
2059 nla_put_failure:
2060 nlmsg_cancel(skb, nlh);
2061 return -EMSGSIZE;
2062 }
2063
2064 #if IS_ENABLED(CONFIG_INET)
2065 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2066 struct fib_dump_filter *filter,
2067 struct netlink_callback *cb)
2068 {
2069 return ip_valid_fib_dump_req(net, nlh, filter, cb);
2070 }
2071 #else
2072 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2073 struct fib_dump_filter *filter,
2074 struct netlink_callback *cb)
2075 {
2076 struct netlink_ext_ack *extack = cb->extack;
2077 struct nlattr *tb[RTA_MAX + 1];
2078 struct rtmsg *rtm;
2079 int err, i;
2080
2081 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2082 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2083 return -EINVAL;
2084 }
2085
2086 rtm = nlmsg_data(nlh);
2087 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
2088 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2089 rtm->rtm_flags) {
2090 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2091 return -EINVAL;
2092 }
2093
2094 if (rtm->rtm_protocol) {
2095 filter->protocol = rtm->rtm_protocol;
2096 filter->filter_set = 1;
2097 cb->answer_flags = NLM_F_DUMP_FILTERED;
2098 }
2099
2100 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2101 rtm_mpls_policy, extack);
2102 if (err < 0)
2103 return err;
2104
2105 for (i = 0; i <= RTA_MAX; ++i) {
2106 int ifindex;
2107
2108 if (i == RTA_OIF) {
2109 ifindex = nla_get_u32(tb[i]);
2110 filter->dev = __dev_get_by_index(net, ifindex);
2111 if (!filter->dev)
2112 return -ENODEV;
2113 filter->filter_set = 1;
2114 } else if (tb[i]) {
2115 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2116 return -EINVAL;
2117 }
2118 }
2119
2120 return 0;
2121 }
2122 #endif
2123
2124 static bool mpls_rt_uses_dev(struct mpls_route *rt,
2125 const struct net_device *dev)
2126 {
2127 struct net_device *nh_dev;
2128
2129 if (rt->rt_nhn == 1) {
2130 struct mpls_nh *nh = rt->rt_nh;
2131
2132 nh_dev = rtnl_dereference(nh->nh_dev);
2133 if (dev == nh_dev)
2134 return true;
2135 } else {
2136 for_nexthops(rt) {
2137 nh_dev = rtnl_dereference(nh->nh_dev);
2138 if (nh_dev == dev)
2139 return true;
2140 } endfor_nexthops(rt);
2141 }
2142
2143 return false;
2144 }
2145
2146 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2147 {
2148 const struct nlmsghdr *nlh = cb->nlh;
2149 struct net *net = sock_net(skb->sk);
2150 struct mpls_route __rcu **platform_label;
2151 struct fib_dump_filter filter = {};
2152 unsigned int flags = NLM_F_MULTI;
2153 size_t platform_labels;
2154 unsigned int index;
2155
2156 ASSERT_RTNL();
2157
2158 if (cb->strict_check) {
2159 int err;
2160
2161 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
2162 if (err < 0)
2163 return err;
2164
2165 /* for MPLS, there is only 1 table with fixed type and flags.
2166 * If either are set in the filter then return nothing.
2167 */
2168 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2169 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2170 filter.flags)
2171 return skb->len;
2172 }
2173
2174 index = cb->args[0];
2175 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2176 index = MPLS_LABEL_FIRST_UNRESERVED;
2177
2178 platform_label = rtnl_dereference(net->mpls.platform_label);
2179 platform_labels = net->mpls.platform_labels;
2180
2181 if (filter.filter_set)
2182 flags |= NLM_F_DUMP_FILTERED;
2183
2184 for (; index < platform_labels; index++) {
2185 struct mpls_route *rt;
2186
2187 rt = rtnl_dereference(platform_label[index]);
2188 if (!rt)
2189 continue;
2190
2191 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2192 (filter.protocol && rt->rt_protocol != filter.protocol))
2193 continue;
2194
2195 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2196 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2197 index, rt, flags) < 0)
2198 break;
2199 }
2200 cb->args[0] = index;
2201
2202 return skb->len;
2203 }
2204
2205 static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2206 {
2207 size_t payload =
2208 NLMSG_ALIGN(sizeof(struct rtmsg))
2209 + nla_total_size(4) /* RTA_DST */
2210 + nla_total_size(1); /* RTA_TTL_PROPAGATE */
2211
2212 if (rt->rt_nhn == 1) {
2213 struct mpls_nh *nh = rt->rt_nh;
2214
2215 if (nh->nh_dev)
2216 payload += nla_total_size(4); /* RTA_OIF */
2217 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
2218 payload += nla_total_size(2 + nh->nh_via_alen);
2219 if (nh->nh_labels) /* RTA_NEWDST */
2220 payload += nla_total_size(nh->nh_labels * 4);
2221 } else {
2222 /* each nexthop is packed in an attribute */
2223 size_t nhsize = 0;
2224
2225 for_nexthops(rt) {
2226 if (!rtnl_dereference(nh->nh_dev))
2227 continue;
2228 nhsize += nla_total_size(sizeof(struct rtnexthop));
2229 /* RTA_VIA */
2230 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2231 nhsize += nla_total_size(2 + nh->nh_via_alen);
2232 if (nh->nh_labels)
2233 nhsize += nla_total_size(nh->nh_labels * 4);
2234 } endfor_nexthops(rt);
2235 /* nested attribute */
2236 payload += nla_total_size(nhsize);
2237 }
2238
2239 return payload;
2240 }
2241
2242 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2243 struct nlmsghdr *nlh, struct net *net, u32 portid,
2244 unsigned int nlm_flags)
2245 {
2246 struct sk_buff *skb;
2247 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2248 int err = -ENOBUFS;
2249
2250 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2251 if (skb == NULL)
2252 goto errout;
2253
2254 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2255 if (err < 0) {
2256 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2257 WARN_ON(err == -EMSGSIZE);
2258 kfree_skb(skb);
2259 goto errout;
2260 }
2261 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2262
2263 return;
2264 errout:
2265 if (err < 0)
2266 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2267 }
2268
2269 static int mpls_valid_getroute_req(struct sk_buff *skb,
2270 const struct nlmsghdr *nlh,
2271 struct nlattr **tb,
2272 struct netlink_ext_ack *extack)
2273 {
2274 struct rtmsg *rtm;
2275 int i, err;
2276
2277 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2278 NL_SET_ERR_MSG_MOD(extack,
2279 "Invalid header for get route request");
2280 return -EINVAL;
2281 }
2282
2283 if (!netlink_strict_get_check(skb))
2284 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2285 rtm_mpls_policy, extack);
2286
2287 rtm = nlmsg_data(nlh);
2288 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
2289 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
2290 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
2291 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
2292 return -EINVAL;
2293 }
2294 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
2295 NL_SET_ERR_MSG_MOD(extack,
2296 "Invalid flags for get route request");
2297 return -EINVAL;
2298 }
2299
2300 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2301 rtm_mpls_policy, extack);
2302 if (err)
2303 return err;
2304
2305 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
2306 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
2307 return -EINVAL;
2308 }
2309
2310 for (i = 0; i <= RTA_MAX; i++) {
2311 if (!tb[i])
2312 continue;
2313
2314 switch (i) {
2315 case RTA_DST:
2316 case RTA_NEWDST:
2317 break;
2318 default:
2319 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
2320 return -EINVAL;
2321 }
2322 }
2323
2324 return 0;
2325 }
2326
2327 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2328 struct netlink_ext_ack *extack)
2329 {
2330 struct net *net = sock_net(in_skb->sk);
2331 u32 portid = NETLINK_CB(in_skb).portid;
2332 u32 in_label = LABEL_NOT_SPECIFIED;
2333 struct nlattr *tb[RTA_MAX + 1];
2334 u32 labels[MAX_NEW_LABELS];
2335 struct mpls_shim_hdr *hdr;
2336 unsigned int hdr_size = 0;
2337 struct net_device *dev;
2338 struct mpls_route *rt;
2339 struct rtmsg *rtm, *r;
2340 struct nlmsghdr *nlh;
2341 struct sk_buff *skb;
2342 struct mpls_nh *nh;
2343 u8 n_labels;
2344 int err;
2345
2346 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack);
2347 if (err < 0)
2348 goto errout;
2349
2350 rtm = nlmsg_data(in_nlh);
2351
2352 if (tb[RTA_DST]) {
2353 u8 label_count;
2354
2355 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2356 &in_label, extack)) {
2357 err = -EINVAL;
2358 goto errout;
2359 }
2360
2361 if (!mpls_label_ok(net, &in_label, extack)) {
2362 err = -EINVAL;
2363 goto errout;
2364 }
2365 }
2366
2367 rt = mpls_route_input_rcu(net, in_label);
2368 if (!rt) {
2369 err = -ENETUNREACH;
2370 goto errout;
2371 }
2372
2373 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2374 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2375 if (!skb) {
2376 err = -ENOBUFS;
2377 goto errout;
2378 }
2379
2380 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2381 RTM_NEWROUTE, in_label, rt, 0);
2382 if (err < 0) {
2383 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2384 WARN_ON(err == -EMSGSIZE);
2385 goto errout_free;
2386 }
2387
2388 return rtnl_unicast(skb, net, portid);
2389 }
2390
2391 if (tb[RTA_NEWDST]) {
2392 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2393 labels, extack) != 0) {
2394 err = -EINVAL;
2395 goto errout;
2396 }
2397
2398 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2399 }
2400
2401 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2402 if (!skb) {
2403 err = -ENOBUFS;
2404 goto errout;
2405 }
2406
2407 skb->protocol = htons(ETH_P_MPLS_UC);
2408
2409 if (hdr_size) {
2410 bool bos;
2411 int i;
2412
2413 if (skb_cow(skb, hdr_size)) {
2414 err = -ENOBUFS;
2415 goto errout_free;
2416 }
2417
2418 skb_reserve(skb, hdr_size);
2419 skb_push(skb, hdr_size);
2420 skb_reset_network_header(skb);
2421
2422 /* Push new labels */
2423 hdr = mpls_hdr(skb);
2424 bos = true;
2425 for (i = n_labels - 1; i >= 0; i--) {
2426 hdr[i] = mpls_entry_encode(labels[i],
2427 1, 0, bos);
2428 bos = false;
2429 }
2430 }
2431
2432 nh = mpls_select_multipath(rt, skb);
2433 if (!nh) {
2434 err = -ENETUNREACH;
2435 goto errout_free;
2436 }
2437
2438 if (hdr_size) {
2439 skb_pull(skb, hdr_size);
2440 skb_reset_network_header(skb);
2441 }
2442
2443 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2444 RTM_NEWROUTE, sizeof(*r), 0);
2445 if (!nlh) {
2446 err = -EMSGSIZE;
2447 goto errout_free;
2448 }
2449
2450 r = nlmsg_data(nlh);
2451 r->rtm_family = AF_MPLS;
2452 r->rtm_dst_len = 20;
2453 r->rtm_src_len = 0;
2454 r->rtm_table = RT_TABLE_MAIN;
2455 r->rtm_type = RTN_UNICAST;
2456 r->rtm_scope = RT_SCOPE_UNIVERSE;
2457 r->rtm_protocol = rt->rt_protocol;
2458 r->rtm_flags = 0;
2459
2460 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2461 goto nla_put_failure;
2462
2463 if (nh->nh_labels &&
2464 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2465 nh->nh_label))
2466 goto nla_put_failure;
2467
2468 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2469 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2470 nh->nh_via_alen))
2471 goto nla_put_failure;
2472 dev = rtnl_dereference(nh->nh_dev);
2473 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2474 goto nla_put_failure;
2475
2476 nlmsg_end(skb, nlh);
2477
2478 err = rtnl_unicast(skb, net, portid);
2479 errout:
2480 return err;
2481
2482 nla_put_failure:
2483 nlmsg_cancel(skb, nlh);
2484 err = -EMSGSIZE;
2485 errout_free:
2486 kfree_skb(skb);
2487 return err;
2488 }
2489
2490 static int resize_platform_label_table(struct net *net, size_t limit)
2491 {
2492 size_t size = sizeof(struct mpls_route *) * limit;
2493 size_t old_limit;
2494 size_t cp_size;
2495 struct mpls_route __rcu **labels = NULL, **old;
2496 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2497 unsigned index;
2498
2499 if (size) {
2500 labels = kvzalloc(size, GFP_KERNEL);
2501 if (!labels)
2502 goto nolabels;
2503 }
2504
2505 /* In case the predefined labels need to be populated */
2506 if (limit > MPLS_LABEL_IPV4NULL) {
2507 struct net_device *lo = net->loopback_dev;
2508 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2509 if (IS_ERR(rt0))
2510 goto nort0;
2511 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
2512 rt0->rt_protocol = RTPROT_KERNEL;
2513 rt0->rt_payload_type = MPT_IPV4;
2514 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2515 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2516 rt0->rt_nh->nh_via_alen = lo->addr_len;
2517 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2518 lo->addr_len);
2519 }
2520 if (limit > MPLS_LABEL_IPV6NULL) {
2521 struct net_device *lo = net->loopback_dev;
2522 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2523 if (IS_ERR(rt2))
2524 goto nort2;
2525 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
2526 rt2->rt_protocol = RTPROT_KERNEL;
2527 rt2->rt_payload_type = MPT_IPV6;
2528 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2529 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2530 rt2->rt_nh->nh_via_alen = lo->addr_len;
2531 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2532 lo->addr_len);
2533 }
2534
2535 rtnl_lock();
2536 /* Remember the original table */
2537 old = rtnl_dereference(net->mpls.platform_label);
2538 old_limit = net->mpls.platform_labels;
2539
2540 /* Free any labels beyond the new table */
2541 for (index = limit; index < old_limit; index++)
2542 mpls_route_update(net, index, NULL, NULL);
2543
2544 /* Copy over the old labels */
2545 cp_size = size;
2546 if (old_limit < limit)
2547 cp_size = old_limit * sizeof(struct mpls_route *);
2548
2549 memcpy(labels, old, cp_size);
2550
2551 /* If needed set the predefined labels */
2552 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2553 (limit > MPLS_LABEL_IPV6NULL)) {
2554 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2555 rt2 = NULL;
2556 }
2557
2558 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2559 (limit > MPLS_LABEL_IPV4NULL)) {
2560 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2561 rt0 = NULL;
2562 }
2563
2564 /* Update the global pointers */
2565 net->mpls.platform_labels = limit;
2566 rcu_assign_pointer(net->mpls.platform_label, labels);
2567
2568 rtnl_unlock();
2569
2570 mpls_rt_free(rt2);
2571 mpls_rt_free(rt0);
2572
2573 if (old) {
2574 synchronize_rcu();
2575 kvfree(old);
2576 }
2577 return 0;
2578
2579 nort2:
2580 mpls_rt_free(rt0);
2581 nort0:
2582 kvfree(labels);
2583 nolabels:
2584 return -ENOMEM;
2585 }
2586
2587 static int mpls_platform_labels(struct ctl_table *table, int write,
2588 void *buffer, size_t *lenp, loff_t *ppos)
2589 {
2590 struct net *net = table->data;
2591 int platform_labels = net->mpls.platform_labels;
2592 int ret;
2593 struct ctl_table tmp = {
2594 .procname = table->procname,
2595 .data = &platform_labels,
2596 .maxlen = sizeof(int),
2597 .mode = table->mode,
2598 .extra1 = SYSCTL_ZERO,
2599 .extra2 = &label_limit,
2600 };
2601
2602 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2603
2604 if (write && ret == 0)
2605 ret = resize_platform_label_table(net, platform_labels);
2606
2607 return ret;
2608 }
2609
2610 #define MPLS_NS_SYSCTL_OFFSET(field) \
2611 (&((struct net *)0)->field)
2612
2613 static const struct ctl_table mpls_table[] = {
2614 {
2615 .procname = "platform_labels",
2616 .data = NULL,
2617 .maxlen = sizeof(int),
2618 .mode = 0644,
2619 .proc_handler = mpls_platform_labels,
2620 },
2621 {
2622 .procname = "ip_ttl_propagate",
2623 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2624 .maxlen = sizeof(int),
2625 .mode = 0644,
2626 .proc_handler = proc_dointvec_minmax,
2627 .extra1 = SYSCTL_ZERO,
2628 .extra2 = SYSCTL_ONE,
2629 },
2630 {
2631 .procname = "default_ttl",
2632 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2633 .maxlen = sizeof(int),
2634 .mode = 0644,
2635 .proc_handler = proc_dointvec_minmax,
2636 .extra1 = SYSCTL_ONE,
2637 .extra2 = &ttl_max,
2638 },
2639 { }
2640 };
2641
2642 static int mpls_net_init(struct net *net)
2643 {
2644 struct ctl_table *table;
2645 int i;
2646
2647 net->mpls.platform_labels = 0;
2648 net->mpls.platform_label = NULL;
2649 net->mpls.ip_ttl_propagate = 1;
2650 net->mpls.default_ttl = 255;
2651
2652 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2653 if (table == NULL)
2654 return -ENOMEM;
2655
2656 /* Table data contains only offsets relative to the base of
2657 * the mdev at this point, so make them absolute.
2658 */
2659 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2660 table[i].data = (char *)net + (uintptr_t)table[i].data;
2661
2662 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
2663 if (net->mpls.ctl == NULL) {
2664 kfree(table);
2665 return -ENOMEM;
2666 }
2667
2668 return 0;
2669 }
2670
2671 static void mpls_net_exit(struct net *net)
2672 {
2673 struct mpls_route __rcu **platform_label;
2674 size_t platform_labels;
2675 struct ctl_table *table;
2676 unsigned int index;
2677
2678 table = net->mpls.ctl->ctl_table_arg;
2679 unregister_net_sysctl_table(net->mpls.ctl);
2680 kfree(table);
2681
2682 /* An rcu grace period has passed since there was a device in
2683 * the network namespace (and thus the last in flight packet)
2684 * left this network namespace. This is because
2685 * unregister_netdevice_many and netdev_run_todo has completed
2686 * for each network device that was in this network namespace.
2687 *
2688 * As such no additional rcu synchronization is necessary when
2689 * freeing the platform_label table.
2690 */
2691 rtnl_lock();
2692 platform_label = rtnl_dereference(net->mpls.platform_label);
2693 platform_labels = net->mpls.platform_labels;
2694 for (index = 0; index < platform_labels; index++) {
2695 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2696 RCU_INIT_POINTER(platform_label[index], NULL);
2697 mpls_notify_route(net, index, rt, NULL, NULL);
2698 mpls_rt_free(rt);
2699 }
2700 rtnl_unlock();
2701
2702 kvfree(platform_label);
2703 }
2704
2705 static struct pernet_operations mpls_net_ops = {
2706 .init = mpls_net_init,
2707 .exit = mpls_net_exit,
2708 };
2709
2710 static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2711 .family = AF_MPLS,
2712 .fill_stats_af = mpls_fill_stats_af,
2713 .get_stats_af_size = mpls_get_stats_af_size,
2714 };
2715
2716 static int __init mpls_init(void)
2717 {
2718 int err;
2719
2720 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2721
2722 err = register_pernet_subsys(&mpls_net_ops);
2723 if (err)
2724 goto out;
2725
2726 err = register_netdevice_notifier(&mpls_dev_notifier);
2727 if (err)
2728 goto out_unregister_pernet;
2729
2730 dev_add_pack(&mpls_packet_type);
2731
2732 rtnl_af_register(&mpls_af_ops);
2733
2734 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2735 mpls_rtm_newroute, NULL, 0);
2736 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2737 mpls_rtm_delroute, NULL, 0);
2738 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2739 mpls_getroute, mpls_dump_routes, 0);
2740 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2741 mpls_netconf_get_devconf,
2742 mpls_netconf_dump_devconf, 0);
2743 err = ipgre_tunnel_encap_add_mpls_ops();
2744 if (err)
2745 pr_err("Can't add mpls over gre tunnel ops\n");
2746
2747 err = 0;
2748 out:
2749 return err;
2750
2751 out_unregister_pernet:
2752 unregister_pernet_subsys(&mpls_net_ops);
2753 goto out;
2754 }
2755 module_init(mpls_init);
2756
2757 static void __exit mpls_exit(void)
2758 {
2759 rtnl_unregister_all(PF_MPLS);
2760 rtnl_af_unregister(&mpls_af_ops);
2761 dev_remove_pack(&mpls_packet_type);
2762 unregister_netdevice_notifier(&mpls_dev_notifier);
2763 unregister_pernet_subsys(&mpls_net_ops);
2764 ipgre_tunnel_encap_del_mpls_ops();
2765 }
2766 module_exit(mpls_exit);
2767
2768 MODULE_DESCRIPTION("MultiProtocol Label Switching");
2769 MODULE_LICENSE("GPL v2");
2770 MODULE_ALIAS_NETPROTO(PF_MPLS);
Linux with added FPC-III support