1
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
31#define MAX_MPLS_ROUTE_MEM 4096
32
33
34
35
36#define MAX_MP_SELECT_LABELS 4
37
38#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
39
40static int zero = 0;
41static int one = 1;
42static int label_limit = (1 << 20) - 1;
43static int ttl_max = 255;
44
45#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
46static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
47{
48 return sizeof(struct mpls_shim_hdr);
49}
50
51static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
52 .encap_hlen = ipgre_mpls_encap_hlen,
53};
54
55static int ipgre_tunnel_encap_add_mpls_ops(void)
56{
57 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
58}
59
60static void ipgre_tunnel_encap_del_mpls_ops(void)
61{
62 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
63}
64#else
65static int ipgre_tunnel_encap_add_mpls_ops(void)
66{
67 return 0;
68}
69
70static void ipgre_tunnel_encap_del_mpls_ops(void)
71{
72}
73#endif
74
75static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
76 struct nlmsghdr *nlh, struct net *net, u32 portid,
77 unsigned int nlm_flags);
78
79static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
80{
81 struct mpls_route *rt = NULL;
82
83 if (index < net->mpls.platform_labels) {
84 struct mpls_route __rcu **platform_label =
85 rcu_dereference(net->mpls.platform_label);
86 rt = rcu_dereference(platform_label[index]);
87 }
88 return rt;
89}
90
91bool mpls_output_possible(const struct net_device *dev)
92{
93 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
94}
95EXPORT_SYMBOL_GPL(mpls_output_possible);
96
97static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
98{
99 return (u8 *)nh + rt->rt_via_offset;
100}
101
102static const u8 *mpls_nh_via(const struct mpls_route *rt,
103 const struct mpls_nh *nh)
104{
105 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
106}
107
108static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
109{
110
111 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
112}
113
114unsigned int mpls_dev_mtu(const struct net_device *dev)
115{
116
117 return dev->mtu;
118}
119EXPORT_SYMBOL_GPL(mpls_dev_mtu);
120
121bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
122{
123 if (skb->len <= mtu)
124 return false;
125
126 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
127 return false;
128
129 return true;
130}
131EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
132
133void mpls_stats_inc_outucastpkts(struct net_device *dev,
134 const struct sk_buff *skb)
135{
136 struct mpls_dev *mdev;
137
138 if (skb->protocol == htons(ETH_P_MPLS_UC)) {
139 mdev = mpls_dev_get(dev);
140 if (mdev)
141 MPLS_INC_STATS_LEN(mdev, skb->len,
142 tx_packets,
143 tx_bytes);
144 } else if (skb->protocol == htons(ETH_P_IP)) {
145 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
146#if IS_ENABLED(CONFIG_IPV6)
147 } else if (skb->protocol == htons(ETH_P_IPV6)) {
148 struct inet6_dev *in6dev = __in6_dev_get(dev);
149
150 if (in6dev)
151 IP6_UPD_PO_STATS(dev_net(dev), in6dev,
152 IPSTATS_MIB_OUT, skb->len);
153#endif
154 }
155}
156EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
157
158static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
159{
160 struct mpls_entry_decoded dec;
161 unsigned int mpls_hdr_len = 0;
162 struct mpls_shim_hdr *hdr;
163 bool eli_seen = false;
164 int label_index;
165 u32 hash = 0;
166
167 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
168 label_index++) {
169 mpls_hdr_len += sizeof(*hdr);
170 if (!pskb_may_pull(skb, mpls_hdr_len))
171 break;
172
173
174 hdr = mpls_hdr(skb) + label_index;
175 dec = mpls_entry_decode(hdr);
176
177
178
179
180 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
181 hash = jhash_1word(dec.label, hash);
182
183
184
185
186
187
188
189 if (eli_seen)
190 break;
191 } else if (dec.label == MPLS_LABEL_ENTROPY) {
192 eli_seen = true;
193 }
194
195 if (!dec.bos)
196 continue;
197
198
199 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) {
200 const struct iphdr *v4hdr;
201
202 v4hdr = (const struct iphdr *)(hdr + 1);
203 if (v4hdr->version == 4) {
204 hash = jhash_3words(ntohl(v4hdr->saddr),
205 ntohl(v4hdr->daddr),
206 v4hdr->protocol, hash);
207 } else if (v4hdr->version == 6 &&
208 pskb_may_pull(skb, mpls_hdr_len +
209 sizeof(struct ipv6hdr))) {
210 const struct ipv6hdr *v6hdr;
211
212 v6hdr = (const struct ipv6hdr *)(hdr + 1);
213 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
214 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
215 hash = jhash_1word(v6hdr->nexthdr, hash);
216 }
217 }
218
219 break;
220 }
221
222 return hash;
223}
224
225static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
226{
227 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
228}
229
230
231
232
233
234
235static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
236 struct sk_buff *skb)
237{
238 u32 hash = 0;
239 int nh_index = 0;
240 int n = 0;
241 u8 alive;
242
243
244
245
246 if (rt->rt_nhn == 1)
247 return rt->rt_nh;
248
249 alive = READ_ONCE(rt->rt_nhn_alive);
250 if (alive == 0)
251 return NULL;
252
253 hash = mpls_multipath_hash(rt, skb);
254 nh_index = hash % alive;
255 if (alive == rt->rt_nhn)
256 goto out;
257 for_nexthops(rt) {
258 unsigned int nh_flags = READ_ONCE(nh->nh_flags);
259
260 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
261 continue;
262 if (n == nh_index)
263 return nh;
264 n++;
265 } endfor_nexthops(rt);
266
267out:
268 return mpls_get_nexthop(rt, nh_index);
269}
270
271static bool mpls_egress(struct net *net, struct mpls_route *rt,
272 struct sk_buff *skb, struct mpls_entry_decoded dec)
273{
274 enum mpls_payload_type payload_type;
275 bool success = false;
276
277
278
279
280
281
282
283
284
285
286
287 if (!pskb_may_pull(skb, 12))
288 return false;
289
290 payload_type = rt->rt_payload_type;
291 if (payload_type == MPT_UNSPEC)
292 payload_type = ip_hdr(skb)->version;
293
294 switch (payload_type) {
295 case MPT_IPV4: {
296 struct iphdr *hdr4 = ip_hdr(skb);
297 u8 new_ttl;
298 skb->protocol = htons(ETH_P_IP);
299
300
301
302
303
304 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
305 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
306 net->mpls.ip_ttl_propagate))
307 new_ttl = dec.ttl;
308 else
309 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0;
310
311 csum_replace2(&hdr4->check,
312 htons(hdr4->ttl << 8),
313 htons(new_ttl << 8));
314 hdr4->ttl = new_ttl;
315 success = true;
316 break;
317 }
318 case MPT_IPV6: {
319 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
320 skb->protocol = htons(ETH_P_IPV6);
321
322
323
324
325
326 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
327 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
328 net->mpls.ip_ttl_propagate))
329 hdr6->hop_limit = dec.ttl;
330 else if (hdr6->hop_limit)
331 hdr6->hop_limit = hdr6->hop_limit - 1;
332 success = true;
333 break;
334 }
335 case MPT_UNSPEC:
336
337 break;
338 }
339
340 return success;
341}
342
343static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
344 struct packet_type *pt, struct net_device *orig_dev)
345{
346 struct net *net = dev_net(dev);
347 struct mpls_shim_hdr *hdr;
348 struct mpls_route *rt;
349 struct mpls_nh *nh;
350 struct mpls_entry_decoded dec;
351 struct net_device *out_dev;
352 struct mpls_dev *out_mdev;
353 struct mpls_dev *mdev;
354 unsigned int hh_len;
355 unsigned int new_header_size;
356 unsigned int mtu;
357 int err;
358
359
360
361 mdev = mpls_dev_get(dev);
362 if (!mdev)
363 goto drop;
364
365 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets,
366 rx_bytes);
367
368 if (!mdev->input_enabled) {
369 MPLS_INC_STATS(mdev, rx_dropped);
370 goto drop;
371 }
372
373 if (skb->pkt_type != PACKET_HOST)
374 goto err;
375
376 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
377 goto err;
378
379 if (!pskb_may_pull(skb, sizeof(*hdr)))
380 goto err;
381
382
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
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
408 if (dec.ttl <= 1)
409 goto err;
410 dec.ttl -= 1;
411
412
413 out_dev = rcu_dereference(nh->nh_dev);
414 if (!mpls_output_possible(out_dev))
415 goto tx_err;
416
417
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
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
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
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
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
508
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
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
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 int err;
623
624 if (!ipv6_stub)
625 return ERR_PTR(-EAFNOSUPPORT);
626
627 memset(&fl6, 0, sizeof(fl6));
628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
629 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
630 if (err)
631 return ERR_PTR(err);
632
633 dev = dst->dev;
634 dev_hold(dev);
635 dst_release(dst);
636
637 return dev;
638}
639#else
640static struct net_device *inet6_fib_lookup_dev(struct net *net,
641 const void *addr)
642{
643 return ERR_PTR(-EAFNOSUPPORT);
644}
645#endif
646
647static struct net_device *find_outdev(struct net *net,
648 struct mpls_route *rt,
649 struct mpls_nh *nh, int oif)
650{
651 struct net_device *dev = NULL;
652
653 if (!oif) {
654 switch (nh->nh_via_table) {
655 case NEIGH_ARP_TABLE:
656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
657 break;
658 case NEIGH_ND_TABLE:
659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
660 break;
661 case NEIGH_LINK_TABLE:
662 break;
663 }
664 } else {
665 dev = dev_get_by_index(net, oif);
666 }
667
668 if (!dev)
669 return ERR_PTR(-ENODEV);
670
671 if (IS_ERR(dev))
672 return dev;
673
674
675 dev_put(dev);
676
677 return dev;
678}
679
680static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
681 struct mpls_nh *nh, int oif)
682{
683 struct net_device *dev = NULL;
684 int err = -ENODEV;
685
686 dev = find_outdev(net, rt, nh, oif);
687 if (IS_ERR(dev)) {
688 err = PTR_ERR(dev);
689 dev = NULL;
690 goto errout;
691 }
692
693
694 err = -EINVAL;
695 if (!mpls_dev_get(dev))
696 goto errout;
697
698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
699 (dev->addr_len != nh->nh_via_alen))
700 goto errout;
701
702 RCU_INIT_POINTER(nh->nh_dev, dev);
703
704 if (!(dev->flags & IFF_UP)) {
705 nh->nh_flags |= RTNH_F_DEAD;
706 } else {
707 unsigned int flags;
708
709 flags = dev_get_flags(dev);
710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
711 nh->nh_flags |= RTNH_F_LINKDOWN;
712 }
713
714 return 0;
715
716errout:
717 return err;
718}
719
720static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
721 u8 via_addr[], struct netlink_ext_ack *extack)
722{
723 struct rtvia *via = nla_data(nla);
724 int err = -EINVAL;
725 int alen;
726
727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
728 NL_SET_ERR_MSG_ATTR(extack, nla,
729 "Invalid attribute length for RTA_VIA");
730 goto errout;
731 }
732 alen = nla_len(nla) -
733 offsetof(struct rtvia, rtvia_addr);
734 if (alen > MAX_VIA_ALEN) {
735 NL_SET_ERR_MSG_ATTR(extack, nla,
736 "Invalid address length for RTA_VIA");
737 goto errout;
738 }
739
740
741 switch (via->rtvia_family) {
742 case AF_PACKET:
743 *via_table = NEIGH_LINK_TABLE;
744 break;
745 case AF_INET:
746 *via_table = NEIGH_ARP_TABLE;
747 if (alen != 4)
748 goto errout;
749 break;
750 case AF_INET6:
751 *via_table = NEIGH_ND_TABLE;
752 if (alen != 16)
753 goto errout;
754 break;
755 default:
756
757 goto errout;
758 }
759
760 memcpy(via_addr, via->rtvia_addr, alen);
761 *via_alen = alen;
762 err = 0;
763
764errout:
765 return err;
766}
767
768static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
769 struct mpls_route *rt)
770{
771 struct net *net = cfg->rc_nlinfo.nl_net;
772 struct mpls_nh *nh = rt->rt_nh;
773 int err;
774 int i;
775
776 if (!nh)
777 return -ENOMEM;
778
779 nh->nh_labels = cfg->rc_output_labels;
780 for (i = 0; i < nh->nh_labels; i++)
781 nh->nh_label[i] = cfg->rc_output_label[i];
782
783 nh->nh_via_table = cfg->rc_via_table;
784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
785 nh->nh_via_alen = cfg->rc_via_alen;
786
787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
788 if (err)
789 goto errout;
790
791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
792 rt->rt_nhn_alive--;
793
794 return 0;
795
796errout:
797 return err;
798}
799
800static int mpls_nh_build(struct net *net, struct mpls_route *rt,
801 struct mpls_nh *nh, int oif, struct nlattr *via,
802 struct nlattr *newdst, u8 max_labels,
803 struct netlink_ext_ack *extack)
804{
805 int err = -ENOMEM;
806
807 if (!nh)
808 goto errout;
809
810 if (newdst) {
811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
812 nh->nh_label, extack);
813 if (err)
814 goto errout;
815 }
816
817 if (via) {
818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
819 __mpls_nh_via(rt, nh), extack);
820 if (err)
821 goto errout;
822 } else {
823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
824 }
825
826 err = mpls_nh_assign_dev(net, rt, nh, oif);
827 if (err)
828 goto errout;
829
830 return 0;
831
832errout:
833 return err;
834}
835
836static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
837 u8 cfg_via_alen, u8 *max_via_alen,
838 u8 *max_labels)
839{
840 int remaining = len;
841 u8 nhs = 0;
842
843 *max_via_alen = 0;
844 *max_labels = 0;
845
846 while (rtnh_ok(rtnh, remaining)) {
847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
848 int attrlen;
849 u8 n_labels = 0;
850
851 attrlen = rtnh_attrlen(rtnh);
852 nla = nla_find(attrs, attrlen, RTA_VIA);
853 if (nla && nla_len(nla) >=
854 offsetof(struct rtvia, rtvia_addr)) {
855 int via_alen = nla_len(nla) -
856 offsetof(struct rtvia, rtvia_addr);
857
858 if (via_alen <= MAX_VIA_ALEN)
859 *max_via_alen = max_t(u16, *max_via_alen,
860 via_alen);
861 }
862
863 nla = nla_find(attrs, attrlen, RTA_NEWDST);
864 if (nla &&
865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
866 NULL, NULL) != 0)
867 return 0;
868
869 *max_labels = max_t(u8, *max_labels, n_labels);
870
871
872
873
874 if (nhs == 255)
875 return 0;
876 nhs++;
877
878 rtnh = rtnh_next(rtnh, &remaining);
879 }
880
881
882 return remaining > 0 ? 0 : nhs;
883}
884
885static int mpls_nh_build_multi(struct mpls_route_config *cfg,
886 struct mpls_route *rt, u8 max_labels,
887 struct netlink_ext_ack *extack)
888{
889 struct rtnexthop *rtnh = cfg->rc_mp;
890 struct nlattr *nla_via, *nla_newdst;
891 int remaining = cfg->rc_mp_len;
892 int err = 0;
893 u8 nhs = 0;
894
895 change_nexthops(rt) {
896 int attrlen;
897
898 nla_via = NULL;
899 nla_newdst = NULL;
900
901 err = -EINVAL;
902 if (!rtnh_ok(rtnh, remaining))
903 goto errout;
904
905
906
907
908 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
909 goto errout;
910
911 attrlen = rtnh_attrlen(rtnh);
912 if (attrlen > 0) {
913 struct nlattr *attrs = rtnh_attrs(rtnh);
914
915 nla_via = nla_find(attrs, attrlen, RTA_VIA);
916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
917 }
918
919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
920 rtnh->rtnh_ifindex, nla_via, nla_newdst,
921 max_labels, extack);
922 if (err)
923 goto errout;
924
925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
926 rt->rt_nhn_alive--;
927
928 rtnh = rtnh_next(rtnh, &remaining);
929 nhs++;
930 } endfor_nexthops(rt);
931
932 rt->rt_nhn = nhs;
933
934 return 0;
935
936errout:
937 return err;
938}
939
940static bool mpls_label_ok(struct net *net, unsigned int *index,
941 struct netlink_ext_ack *extack)
942{
943 bool is_ok = true;
944
945
946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
947 NL_SET_ERR_MSG(extack,
948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
949 is_ok = false;
950 }
951
952
953 if (is_ok && *index >= net->mpls.platform_labels) {
954 NL_SET_ERR_MSG(extack,
955 "Label >= configured maximum in platform_labels");
956 is_ok = false;
957 }
958
959 *index = array_index_nospec(*index, net->mpls.platform_labels);
960 return is_ok;
961}
962
963static int mpls_route_add(struct mpls_route_config *cfg,
964 struct netlink_ext_ack *extack)
965{
966 struct mpls_route __rcu **platform_label;
967 struct net *net = cfg->rc_nlinfo.nl_net;
968 struct mpls_route *rt, *old;
969 int err = -EINVAL;
970 u8 max_via_alen;
971 unsigned index;
972 u8 max_labels;
973 u8 nhs;
974
975 index = cfg->rc_label;
976
977
978 if ((index == LABEL_NOT_SPECIFIED) &&
979 (cfg->rc_nlflags & NLM_F_CREATE)) {
980 index = find_free_label(net);
981 }
982
983 if (!mpls_label_ok(net, &index, extack))
984 goto errout;
985
986
987 err = -EOPNOTSUPP;
988 if (cfg->rc_nlflags & NLM_F_APPEND) {
989 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
990 goto errout;
991 }
992
993 err = -EEXIST;
994 platform_label = rtnl_dereference(net->mpls.platform_label);
995 old = rtnl_dereference(platform_label[index]);
996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
997 goto errout;
998
999 err = -EEXIST;
1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
1001 goto errout;
1002
1003 err = -ENOENT;
1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1005 goto errout;
1006
1007 err = -EINVAL;
1008 if (cfg->rc_mp) {
1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1010 cfg->rc_via_alen, &max_via_alen,
1011 &max_labels);
1012 } else {
1013 max_via_alen = cfg->rc_via_alen;
1014 max_labels = cfg->rc_output_labels;
1015 nhs = 1;
1016 }
1017
1018 if (nhs == 0) {
1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
1020 goto errout;
1021 }
1022
1023 err = -ENOMEM;
1024 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1025 if (IS_ERR(rt)) {
1026 err = PTR_ERR(rt);
1027 goto errout;
1028 }
1029
1030 rt->rt_protocol = cfg->rc_protocol;
1031 rt->rt_payload_type = cfg->rc_payload_type;
1032 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1033
1034 if (cfg->rc_mp)
1035 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1036 else
1037 err = mpls_nh_build_from_cfg(cfg, rt);
1038 if (err)
1039 goto freert;
1040
1041 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1042
1043 return 0;
1044
1045freert:
1046 mpls_rt_free(rt);
1047errout:
1048 return err;
1049}
1050
1051static int mpls_route_del(struct mpls_route_config *cfg,
1052 struct netlink_ext_ack *extack)
1053{
1054 struct net *net = cfg->rc_nlinfo.nl_net;
1055 unsigned index;
1056 int err = -EINVAL;
1057
1058 index = cfg->rc_label;
1059
1060 if (!mpls_label_ok(net, &index, extack))
1061 goto errout;
1062
1063 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1064
1065 err = 0;
1066errout:
1067 return err;
1068}
1069
1070static void mpls_get_stats(struct mpls_dev *mdev,
1071 struct mpls_link_stats *stats)
1072{
1073 struct mpls_pcpu_stats *p;
1074 int i;
1075
1076 memset(stats, 0, sizeof(*stats));
1077
1078 for_each_possible_cpu(i) {
1079 struct mpls_link_stats local;
1080 unsigned int start;
1081
1082 p = per_cpu_ptr(mdev->stats, i);
1083 do {
1084 start = u64_stats_fetch_begin(&p->syncp);
1085 local = p->stats;
1086 } while (u64_stats_fetch_retry(&p->syncp, start));
1087
1088 stats->rx_packets += local.rx_packets;
1089 stats->rx_bytes += local.rx_bytes;
1090 stats->tx_packets += local.tx_packets;
1091 stats->tx_bytes += local.tx_bytes;
1092 stats->rx_errors += local.rx_errors;
1093 stats->tx_errors += local.tx_errors;
1094 stats->rx_dropped += local.rx_dropped;
1095 stats->tx_dropped += local.tx_dropped;
1096 stats->rx_noroute += local.rx_noroute;
1097 }
1098}
1099
1100static int mpls_fill_stats_af(struct sk_buff *skb,
1101 const struct net_device *dev)
1102{
1103 struct mpls_link_stats *stats;
1104 struct mpls_dev *mdev;
1105 struct nlattr *nla;
1106
1107 mdev = mpls_dev_get(dev);
1108 if (!mdev)
1109 return -ENODATA;
1110
1111 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1112 sizeof(struct mpls_link_stats),
1113 MPLS_STATS_UNSPEC);
1114 if (!nla)
1115 return -EMSGSIZE;
1116
1117 stats = nla_data(nla);
1118 mpls_get_stats(mdev, stats);
1119
1120 return 0;
1121}
1122
1123static size_t mpls_get_stats_af_size(const struct net_device *dev)
1124{
1125 struct mpls_dev *mdev;
1126
1127 mdev = mpls_dev_get(dev);
1128 if (!mdev)
1129 return 0;
1130
1131 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1132}
1133
1134static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1135 u32 portid, u32 seq, int event,
1136 unsigned int flags, int type)
1137{
1138 struct nlmsghdr *nlh;
1139 struct netconfmsg *ncm;
1140 bool all = false;
1141
1142 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1143 flags);
1144 if (!nlh)
1145 return -EMSGSIZE;
1146
1147 if (type == NETCONFA_ALL)
1148 all = true;
1149
1150 ncm = nlmsg_data(nlh);
1151 ncm->ncm_family = AF_MPLS;
1152
1153 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1154 goto nla_put_failure;
1155
1156 if ((all || type == NETCONFA_INPUT) &&
1157 nla_put_s32(skb, NETCONFA_INPUT,
1158 mdev->input_enabled) < 0)
1159 goto nla_put_failure;
1160
1161 nlmsg_end(skb, nlh);
1162 return 0;
1163
1164nla_put_failure:
1165 nlmsg_cancel(skb, nlh);
1166 return -EMSGSIZE;
1167}
1168
1169static int mpls_netconf_msgsize_devconf(int type)
1170{
1171 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1172 + nla_total_size(4);
1173 bool all = false;
1174
1175 if (type == NETCONFA_ALL)
1176 all = true;
1177
1178 if (all || type == NETCONFA_INPUT)
1179 size += nla_total_size(4);
1180
1181 return size;
1182}
1183
1184static void mpls_netconf_notify_devconf(struct net *net, int event,
1185 int type, struct mpls_dev *mdev)
1186{
1187 struct sk_buff *skb;
1188 int err = -ENOBUFS;
1189
1190 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1191 if (!skb)
1192 goto errout;
1193
1194 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1195 if (err < 0) {
1196
1197 WARN_ON(err == -EMSGSIZE);
1198 kfree_skb(skb);
1199 goto errout;
1200 }
1201
1202 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1203 return;
1204errout:
1205 if (err < 0)
1206 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1207}
1208
1209static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1210 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1211};
1212
1213static int mpls_netconf_valid_get_req(struct sk_buff *skb,
1214 const struct nlmsghdr *nlh,
1215 struct nlattr **tb,
1216 struct netlink_ext_ack *extack)
1217{
1218 int i, err;
1219
1220 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
1221 NL_SET_ERR_MSG_MOD(extack,
1222 "Invalid header for netconf get request");
1223 return -EINVAL;
1224 }
1225
1226 if (!netlink_strict_get_check(skb))
1227 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
1228 tb, NETCONFA_MAX,
1229 devconf_mpls_policy, extack);
1230
1231 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
1232 tb, NETCONFA_MAX,
1233 devconf_mpls_policy, extack);
1234 if (err)
1235 return err;
1236
1237 for (i = 0; i <= NETCONFA_MAX; i++) {
1238 if (!tb[i])
1239 continue;
1240
1241 switch (i) {
1242 case NETCONFA_IFINDEX:
1243 break;
1244 default:
1245 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
1246 return -EINVAL;
1247 }
1248 }
1249
1250 return 0;
1251}
1252
1253static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1254 struct nlmsghdr *nlh,
1255 struct netlink_ext_ack *extack)
1256{
1257 struct net *net = sock_net(in_skb->sk);
1258 struct nlattr *tb[NETCONFA_MAX + 1];
1259 struct net_device *dev;
1260 struct mpls_dev *mdev;
1261 struct sk_buff *skb;
1262 int ifindex;
1263 int err;
1264
1265 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
1266 if (err < 0)
1267 goto errout;
1268
1269 err = -EINVAL;
1270 if (!tb[NETCONFA_IFINDEX])
1271 goto errout;
1272
1273 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1274 dev = __dev_get_by_index(net, ifindex);
1275 if (!dev)
1276 goto errout;
1277
1278 mdev = mpls_dev_get(dev);
1279 if (!mdev)
1280 goto errout;
1281
1282 err = -ENOBUFS;
1283 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1284 if (!skb)
1285 goto errout;
1286
1287 err = mpls_netconf_fill_devconf(skb, mdev,
1288 NETLINK_CB(in_skb).portid,
1289 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1290 NETCONFA_ALL);
1291 if (err < 0) {
1292
1293 WARN_ON(err == -EMSGSIZE);
1294 kfree_skb(skb);
1295 goto errout;
1296 }
1297 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1298errout:
1299 return err;
1300}
1301
1302static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1303 struct netlink_callback *cb)
1304{
1305 const struct nlmsghdr *nlh = cb->nlh;
1306 struct net *net = sock_net(skb->sk);
1307 struct hlist_head *head;
1308 struct net_device *dev;
1309 struct mpls_dev *mdev;
1310 int idx, s_idx;
1311 int h, s_h;
1312
1313 if (cb->strict_check) {
1314 struct netlink_ext_ack *extack = cb->extack;
1315 struct netconfmsg *ncm;
1316
1317 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1318 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1319 return -EINVAL;
1320 }
1321
1322 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1323 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1324 return -EINVAL;
1325 }
1326 }
1327
1328 s_h = cb->args[0];
1329 s_idx = idx = cb->args[1];
1330
1331 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1332 idx = 0;
1333 head = &net->dev_index_head[h];
1334 rcu_read_lock();
1335 cb->seq = net->dev_base_seq;
1336 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1337 if (idx < s_idx)
1338 goto cont;
1339 mdev = mpls_dev_get(dev);
1340 if (!mdev)
1341 goto cont;
1342 if (mpls_netconf_fill_devconf(skb, mdev,
1343 NETLINK_CB(cb->skb).portid,
1344 nlh->nlmsg_seq,
1345 RTM_NEWNETCONF,
1346 NLM_F_MULTI,
1347 NETCONFA_ALL) < 0) {
1348 rcu_read_unlock();
1349 goto done;
1350 }
1351 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1352cont:
1353 idx++;
1354 }
1355 rcu_read_unlock();
1356 }
1357done:
1358 cb->args[0] = h;
1359 cb->args[1] = idx;
1360
1361 return skb->len;
1362}
1363
1364#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1365 (&((struct mpls_dev *)0)->field)
1366
1367static int mpls_conf_proc(struct ctl_table *ctl, int write,
1368 void __user *buffer,
1369 size_t *lenp, loff_t *ppos)
1370{
1371 int oval = *(int *)ctl->data;
1372 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1373
1374 if (write) {
1375 struct mpls_dev *mdev = ctl->extra1;
1376 int i = (int *)ctl->data - (int *)mdev;
1377 struct net *net = ctl->extra2;
1378 int val = *(int *)ctl->data;
1379
1380 if (i == offsetof(struct mpls_dev, input_enabled) &&
1381 val != oval) {
1382 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1383 NETCONFA_INPUT, mdev);
1384 }
1385 }
1386
1387 return ret;
1388}
1389
1390static const struct ctl_table mpls_dev_table[] = {
1391 {
1392 .procname = "input",
1393 .maxlen = sizeof(int),
1394 .mode = 0644,
1395 .proc_handler = mpls_conf_proc,
1396 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1397 },
1398 { }
1399};
1400
1401static int mpls_dev_sysctl_register(struct net_device *dev,
1402 struct mpls_dev *mdev)
1403{
1404 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1405 struct net *net = dev_net(dev);
1406 struct ctl_table *table;
1407 int i;
1408
1409 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1410 if (!table)
1411 goto out;
1412
1413
1414
1415
1416 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
1417 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1418 table[i].extra1 = mdev;
1419 table[i].extra2 = net;
1420 }
1421
1422 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1423
1424 mdev->sysctl = register_net_sysctl(net, path, table);
1425 if (!mdev->sysctl)
1426 goto free;
1427
1428 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1429 return 0;
1430
1431free:
1432 kfree(table);
1433out:
1434 return -ENOBUFS;
1435}
1436
1437static void mpls_dev_sysctl_unregister(struct net_device *dev,
1438 struct mpls_dev *mdev)
1439{
1440 struct net *net = dev_net(dev);
1441 struct ctl_table *table;
1442
1443 table = mdev->sysctl->ctl_table_arg;
1444 unregister_net_sysctl_table(mdev->sysctl);
1445 kfree(table);
1446
1447 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1448}
1449
1450static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1451{
1452 struct mpls_dev *mdev;
1453 int err = -ENOMEM;
1454 int i;
1455
1456 ASSERT_RTNL();
1457
1458 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1459 if (!mdev)
1460 return ERR_PTR(err);
1461
1462 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1463 if (!mdev->stats)
1464 goto free;
1465
1466 for_each_possible_cpu(i) {
1467 struct mpls_pcpu_stats *mpls_stats;
1468
1469 mpls_stats = per_cpu_ptr(mdev->stats, i);
1470 u64_stats_init(&mpls_stats->syncp);
1471 }
1472
1473 mdev->dev = dev;
1474
1475 err = mpls_dev_sysctl_register(dev, mdev);
1476 if (err)
1477 goto free;
1478
1479 rcu_assign_pointer(dev->mpls_ptr, mdev);
1480
1481 return mdev;
1482
1483free:
1484 free_percpu(mdev->stats);
1485 kfree(mdev);
1486 return ERR_PTR(err);
1487}
1488
1489static void mpls_dev_destroy_rcu(struct rcu_head *head)
1490{
1491 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1492
1493 free_percpu(mdev->stats);
1494 kfree(mdev);
1495}
1496
1497static void mpls_ifdown(struct net_device *dev, int event)
1498{
1499 struct mpls_route __rcu **platform_label;
1500 struct net *net = dev_net(dev);
1501 u8 alive, deleted;
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
1508 if (!rt)
1509 continue;
1510
1511 alive = 0;
1512 deleted = 0;
1513 change_nexthops(rt) {
1514 unsigned int nh_flags = nh->nh_flags;
1515
1516 if (rtnl_dereference(nh->nh_dev) != dev)
1517 goto next;
1518
1519 switch (event) {
1520 case NETDEV_DOWN:
1521 case NETDEV_UNREGISTER:
1522 nh_flags |= RTNH_F_DEAD;
1523
1524 case NETDEV_CHANGE:
1525 nh_flags |= RTNH_F_LINKDOWN;
1526 break;
1527 }
1528 if (event == NETDEV_UNREGISTER)
1529 RCU_INIT_POINTER(nh->nh_dev, NULL);
1530
1531 if (nh->nh_flags != nh_flags)
1532 WRITE_ONCE(nh->nh_flags, nh_flags);
1533next:
1534 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1535 alive++;
1536 if (!rtnl_dereference(nh->nh_dev))
1537 deleted++;
1538 } endfor_nexthops(rt);
1539
1540 WRITE_ONCE(rt->rt_nhn_alive, alive);
1541
1542
1543 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
1544 mpls_route_update(net, index, NULL, NULL);
1545 }
1546}
1547
1548static void mpls_ifup(struct net_device *dev, unsigned int flags)
1549{
1550 struct mpls_route __rcu **platform_label;
1551 struct net *net = dev_net(dev);
1552 unsigned index;
1553 u8 alive;
1554
1555 platform_label = rtnl_dereference(net->mpls.platform_label);
1556 for (index = 0; index < net->mpls.platform_labels; index++) {
1557 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1558
1559 if (!rt)
1560 continue;
1561
1562 alive = 0;
1563 change_nexthops(rt) {
1564 unsigned int nh_flags = nh->nh_flags;
1565 struct net_device *nh_dev =
1566 rtnl_dereference(nh->nh_dev);
1567
1568 if (!(nh_flags & flags)) {
1569 alive++;
1570 continue;
1571 }
1572 if (nh_dev != dev)
1573 continue;
1574 alive++;
1575 nh_flags &= ~flags;
1576 WRITE_ONCE(nh->nh_flags, nh_flags);
1577 } endfor_nexthops(rt);
1578
1579 WRITE_ONCE(rt->rt_nhn_alive, alive);
1580 }
1581}
1582
1583static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1584 void *ptr)
1585{
1586 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1587 struct mpls_dev *mdev;
1588 unsigned int flags;
1589
1590 if (event == NETDEV_REGISTER) {
1591
1592
1593
1594
1595 if (dev->type == ARPHRD_ETHER ||
1596 dev->type == ARPHRD_LOOPBACK ||
1597 dev->type == ARPHRD_IPGRE ||
1598 dev->type == ARPHRD_IP6GRE ||
1599 dev->type == ARPHRD_SIT ||
1600 dev->type == ARPHRD_TUNNEL) {
1601 mdev = mpls_add_dev(dev);
1602 if (IS_ERR(mdev))
1603 return notifier_from_errno(PTR_ERR(mdev));
1604 }
1605 return NOTIFY_OK;
1606 }
1607
1608 mdev = mpls_dev_get(dev);
1609 if (!mdev)
1610 return NOTIFY_OK;
1611
1612 switch (event) {
1613 case NETDEV_DOWN:
1614 mpls_ifdown(dev, event);
1615 break;
1616 case NETDEV_UP:
1617 flags = dev_get_flags(dev);
1618 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1619 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1620 else
1621 mpls_ifup(dev, RTNH_F_DEAD);
1622 break;
1623 case NETDEV_CHANGE:
1624 flags = dev_get_flags(dev);
1625 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1626 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1627 else
1628 mpls_ifdown(dev, event);
1629 break;
1630 case NETDEV_UNREGISTER:
1631 mpls_ifdown(dev, event);
1632 mdev = mpls_dev_get(dev);
1633 if (mdev) {
1634 mpls_dev_sysctl_unregister(dev, mdev);
1635 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1636 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1637 }
1638 break;
1639 case NETDEV_CHANGENAME:
1640 mdev = mpls_dev_get(dev);
1641 if (mdev) {
1642 int err;
1643
1644 mpls_dev_sysctl_unregister(dev, mdev);
1645 err = mpls_dev_sysctl_register(dev, mdev);
1646 if (err)
1647 return notifier_from_errno(err);
1648 }
1649 break;
1650 }
1651 return NOTIFY_OK;
1652}
1653
1654static struct notifier_block mpls_dev_notifier = {
1655 .notifier_call = mpls_dev_notify,
1656};
1657
1658static int nla_put_via(struct sk_buff *skb,
1659 u8 table, const void *addr, int alen)
1660{
1661 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1662 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1663 };
1664 struct nlattr *nla;
1665 struct rtvia *via;
1666 int family = AF_UNSPEC;
1667
1668 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1669 if (!nla)
1670 return -EMSGSIZE;
1671
1672 if (table <= NEIGH_NR_TABLES)
1673 family = table_to_family[table];
1674
1675 via = nla_data(nla);
1676 via->rtvia_family = family;
1677 memcpy(via->rtvia_addr, addr, alen);
1678 return 0;
1679}
1680
1681int nla_put_labels(struct sk_buff *skb, int attrtype,
1682 u8 labels, const u32 label[])
1683{
1684 struct nlattr *nla;
1685 struct mpls_shim_hdr *nla_label;
1686 bool bos;
1687 int i;
1688 nla = nla_reserve(skb, attrtype, labels*4);
1689 if (!nla)
1690 return -EMSGSIZE;
1691
1692 nla_label = nla_data(nla);
1693 bos = true;
1694 for (i = labels - 1; i >= 0; i--) {
1695 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1696 bos = false;
1697 }
1698
1699 return 0;
1700}
1701EXPORT_SYMBOL_GPL(nla_put_labels);
1702
1703int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1704 u32 label[], struct netlink_ext_ack *extack)
1705{
1706 unsigned len = nla_len(nla);
1707 struct mpls_shim_hdr *nla_label;
1708 u8 nla_labels;
1709 bool bos;
1710 int i;
1711
1712
1713
1714
1715 if (len & 3 || len / 4 > 255) {
1716 NL_SET_ERR_MSG_ATTR(extack, nla,
1717 "Invalid length for labels attribute");
1718 return -EINVAL;
1719 }
1720
1721
1722 nla_labels = len/4;
1723 if (nla_labels > max_labels) {
1724 NL_SET_ERR_MSG(extack, "Too many labels");
1725 return -EINVAL;
1726 }
1727
1728
1729 if (!label)
1730 goto out;
1731
1732 nla_label = nla_data(nla);
1733 bos = true;
1734 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1735 struct mpls_entry_decoded dec;
1736 dec = mpls_entry_decode(nla_label + i);
1737
1738
1739
1740
1741 if (dec.ttl) {
1742 NL_SET_ERR_MSG_ATTR(extack, nla,
1743 "TTL in label must be 0");
1744 return -EINVAL;
1745 }
1746
1747 if (dec.tc) {
1748 NL_SET_ERR_MSG_ATTR(extack, nla,
1749 "Traffic class in label must be 0");
1750 return -EINVAL;
1751 }
1752
1753 if (dec.bos != bos) {
1754 NL_SET_BAD_ATTR(extack, nla);
1755 if (bos) {
1756 NL_SET_ERR_MSG(extack,
1757 "BOS bit must be set in first label");
1758 } else {
1759 NL_SET_ERR_MSG(extack,
1760 "BOS bit can only be set in first label");
1761 }
1762 return -EINVAL;
1763 }
1764
1765 switch (dec.label) {
1766 case MPLS_LABEL_IMPLNULL:
1767
1768
1769
1770
1771 NL_SET_ERR_MSG_ATTR(extack, nla,
1772 "Implicit NULL Label (3) can not be used in encapsulation");
1773 return -EINVAL;
1774 }
1775
1776 label[i] = dec.label;
1777 }
1778out:
1779 *labels = nla_labels;
1780 return 0;
1781}
1782EXPORT_SYMBOL_GPL(nla_get_labels);
1783
1784static int rtm_to_route_config(struct sk_buff *skb,
1785 struct nlmsghdr *nlh,
1786 struct mpls_route_config *cfg,
1787 struct netlink_ext_ack *extack)
1788{
1789 struct rtmsg *rtm;
1790 struct nlattr *tb[RTA_MAX+1];
1791 int index;
1792 int err;
1793
1794 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1795 rtm_mpls_policy, extack);
1796 if (err < 0)
1797 goto errout;
1798
1799 err = -EINVAL;
1800 rtm = nlmsg_data(nlh);
1801
1802 if (rtm->rtm_family != AF_MPLS) {
1803 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1804 goto errout;
1805 }
1806 if (rtm->rtm_dst_len != 20) {
1807 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1808 goto errout;
1809 }
1810 if (rtm->rtm_src_len != 0) {
1811 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1812 goto errout;
1813 }
1814 if (rtm->rtm_tos != 0) {
1815 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1816 goto errout;
1817 }
1818 if (rtm->rtm_table != RT_TABLE_MAIN) {
1819 NL_SET_ERR_MSG(extack,
1820 "MPLS only supports the main route table");
1821 goto errout;
1822 }
1823
1824
1825
1826
1827
1828
1829 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1830 NL_SET_ERR_MSG(extack,
1831 "Invalid route scope - MPLS only supports UNIVERSE");
1832 goto errout;
1833 }
1834 if (rtm->rtm_type != RTN_UNICAST) {
1835 NL_SET_ERR_MSG(extack,
1836 "Invalid route type - MPLS only supports UNICAST");
1837 goto errout;
1838 }
1839 if (rtm->rtm_flags != 0) {
1840 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1841 goto errout;
1842 }
1843
1844 cfg->rc_label = LABEL_NOT_SPECIFIED;
1845 cfg->rc_protocol = rtm->rtm_protocol;
1846 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1847 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1848 cfg->rc_nlflags = nlh->nlmsg_flags;
1849 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1850 cfg->rc_nlinfo.nlh = nlh;
1851 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1852
1853 for (index = 0; index <= RTA_MAX; index++) {
1854 struct nlattr *nla = tb[index];
1855 if (!nla)
1856 continue;
1857
1858 switch (index) {
1859 case RTA_OIF:
1860 cfg->rc_ifindex = nla_get_u32(nla);
1861 break;
1862 case RTA_NEWDST:
1863 if (nla_get_labels(nla, MAX_NEW_LABELS,
1864 &cfg->rc_output_labels,
1865 cfg->rc_output_label, extack))
1866 goto errout;
1867 break;
1868 case RTA_DST:
1869 {
1870 u8 label_count;
1871 if (nla_get_labels(nla, 1, &label_count,
1872 &cfg->rc_label, extack))
1873 goto errout;
1874
1875 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1876 &cfg->rc_label, extack))
1877 goto errout;
1878 break;
1879 }
1880 case RTA_GATEWAY:
1881 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
1882 goto errout;
1883 case RTA_VIA:
1884 {
1885 if (nla_get_via(nla, &cfg->rc_via_alen,
1886 &cfg->rc_via_table, cfg->rc_via,
1887 extack))
1888 goto errout;
1889 break;
1890 }
1891 case RTA_MULTIPATH:
1892 {
1893 cfg->rc_mp = nla_data(nla);
1894 cfg->rc_mp_len = nla_len(nla);
1895 break;
1896 }
1897 case RTA_TTL_PROPAGATE:
1898 {
1899 u8 ttl_propagate = nla_get_u8(nla);
1900
1901 if (ttl_propagate > 1) {
1902 NL_SET_ERR_MSG_ATTR(extack, nla,
1903 "RTA_TTL_PROPAGATE can only be 0 or 1");
1904 goto errout;
1905 }
1906 cfg->rc_ttl_propagate = ttl_propagate ?
1907 MPLS_TTL_PROP_ENABLED :
1908 MPLS_TTL_PROP_DISABLED;
1909 break;
1910 }
1911 default:
1912 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1913
1914 goto errout;
1915 }
1916 }
1917
1918 err = 0;
1919errout:
1920 return err;
1921}
1922
1923static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1924 struct netlink_ext_ack *extack)
1925{
1926 struct mpls_route_config *cfg;
1927 int err;
1928
1929 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1930 if (!cfg)
1931 return -ENOMEM;
1932
1933 err = rtm_to_route_config(skb, nlh, cfg, extack);
1934 if (err < 0)
1935 goto out;
1936
1937 err = mpls_route_del(cfg, extack);
1938out:
1939 kfree(cfg);
1940
1941 return err;
1942}
1943
1944
1945static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1946 struct netlink_ext_ack *extack)
1947{
1948 struct mpls_route_config *cfg;
1949 int err;
1950
1951 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1952 if (!cfg)
1953 return -ENOMEM;
1954
1955 err = rtm_to_route_config(skb, nlh, cfg, extack);
1956 if (err < 0)
1957 goto out;
1958
1959 err = mpls_route_add(cfg, extack);
1960out:
1961 kfree(cfg);
1962
1963 return err;
1964}
1965
1966static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1967 u32 label, struct mpls_route *rt, int flags)
1968{
1969 struct net_device *dev;
1970 struct nlmsghdr *nlh;
1971 struct rtmsg *rtm;
1972
1973 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1974 if (nlh == NULL)
1975 return -EMSGSIZE;
1976
1977 rtm = nlmsg_data(nlh);
1978 rtm->rtm_family = AF_MPLS;
1979 rtm->rtm_dst_len = 20;
1980 rtm->rtm_src_len = 0;
1981 rtm->rtm_tos = 0;
1982 rtm->rtm_table = RT_TABLE_MAIN;
1983 rtm->rtm_protocol = rt->rt_protocol;
1984 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1985 rtm->rtm_type = RTN_UNICAST;
1986 rtm->rtm_flags = 0;
1987
1988 if (nla_put_labels(skb, RTA_DST, 1, &label))
1989 goto nla_put_failure;
1990
1991 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1992 bool ttl_propagate =
1993 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1994
1995 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
1996 ttl_propagate))
1997 goto nla_put_failure;
1998 }
1999 if (rt->rt_nhn == 1) {
2000 const struct mpls_nh *nh = rt->rt_nh;
2001
2002 if (nh->nh_labels &&
2003 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2004 nh->nh_label))
2005 goto nla_put_failure;
2006 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2007 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2008 nh->nh_via_alen))
2009 goto nla_put_failure;
2010 dev = rtnl_dereference(nh->nh_dev);
2011 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2012 goto nla_put_failure;
2013 if (nh->nh_flags & RTNH_F_LINKDOWN)
2014 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2015 if (nh->nh_flags & RTNH_F_DEAD)
2016 rtm->rtm_flags |= RTNH_F_DEAD;
2017 } else {
2018 struct rtnexthop *rtnh;
2019 struct nlattr *mp;
2020 u8 linkdown = 0;
2021 u8 dead = 0;
2022
2023 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
2024 if (!mp)
2025 goto nla_put_failure;
2026
2027 for_nexthops(rt) {
2028 dev = rtnl_dereference(nh->nh_dev);
2029 if (!dev)
2030 continue;
2031
2032 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
2033 if (!rtnh)
2034 goto nla_put_failure;
2035
2036 rtnh->rtnh_ifindex = dev->ifindex;
2037 if (nh->nh_flags & RTNH_F_LINKDOWN) {
2038 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
2039 linkdown++;
2040 }
2041 if (nh->nh_flags & RTNH_F_DEAD) {
2042 rtnh->rtnh_flags |= RTNH_F_DEAD;
2043 dead++;
2044 }
2045
2046 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2047 nh->nh_labels,
2048 nh->nh_label))
2049 goto nla_put_failure;
2050 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2051 nla_put_via(skb, nh->nh_via_table,
2052 mpls_nh_via(rt, nh),
2053 nh->nh_via_alen))
2054 goto nla_put_failure;
2055
2056
2057 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2058 } endfor_nexthops(rt);
2059
2060 if (linkdown == rt->rt_nhn)
2061 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2062 if (dead == rt->rt_nhn)
2063 rtm->rtm_flags |= RTNH_F_DEAD;
2064
2065 nla_nest_end(skb, mp);
2066 }
2067
2068 nlmsg_end(skb, nlh);
2069 return 0;
2070
2071nla_put_failure:
2072 nlmsg_cancel(skb, nlh);
2073 return -EMSGSIZE;
2074}
2075
2076#if IS_ENABLED(CONFIG_INET)
2077static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2078 struct fib_dump_filter *filter,
2079 struct netlink_callback *cb)
2080{
2081 return ip_valid_fib_dump_req(net, nlh, filter, cb);
2082}
2083#else
2084static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2085 struct fib_dump_filter *filter,
2086 struct netlink_callback *cb)
2087{
2088 struct netlink_ext_ack *extack = cb->extack;
2089 struct nlattr *tb[RTA_MAX + 1];
2090 struct rtmsg *rtm;
2091 int err, i;
2092
2093 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2094 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2095 return -EINVAL;
2096 }
2097
2098 rtm = nlmsg_data(nlh);
2099 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
2100 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2101 rtm->rtm_flags) {
2102 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2103 return -EINVAL;
2104 }
2105
2106 if (rtm->rtm_protocol) {
2107 filter->protocol = rtm->rtm_protocol;
2108 filter->filter_set = 1;
2109 cb->answer_flags = NLM_F_DUMP_FILTERED;
2110 }
2111
2112 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2113 rtm_mpls_policy, extack);
2114 if (err < 0)
2115 return err;
2116
2117 for (i = 0; i <= RTA_MAX; ++i) {
2118 int ifindex;
2119
2120 if (i == RTA_OIF) {
2121 ifindex = nla_get_u32(tb[i]);
2122 filter->dev = __dev_get_by_index(net, ifindex);
2123 if (!filter->dev)
2124 return -ENODEV;
2125 filter->filter_set = 1;
2126 } else if (tb[i]) {
2127 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2128 return -EINVAL;
2129 }
2130 }
2131
2132 return 0;
2133}
2134#endif
2135
2136static bool mpls_rt_uses_dev(struct mpls_route *rt,
2137 const struct net_device *dev)
2138{
2139 struct net_device *nh_dev;
2140
2141 if (rt->rt_nhn == 1) {
2142 struct mpls_nh *nh = rt->rt_nh;
2143
2144 nh_dev = rtnl_dereference(nh->nh_dev);
2145 if (dev == nh_dev)
2146 return true;
2147 } else {
2148 for_nexthops(rt) {
2149 nh_dev = rtnl_dereference(nh->nh_dev);
2150 if (nh_dev == dev)
2151 return true;
2152 } endfor_nexthops(rt);
2153 }
2154
2155 return false;
2156}
2157
2158static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2159{
2160 const struct nlmsghdr *nlh = cb->nlh;
2161 struct net *net = sock_net(skb->sk);
2162 struct mpls_route __rcu **platform_label;
2163 struct fib_dump_filter filter = {};
2164 unsigned int flags = NLM_F_MULTI;
2165 size_t platform_labels;
2166 unsigned int index;
2167
2168 ASSERT_RTNL();
2169
2170 if (cb->strict_check) {
2171 int err;
2172
2173 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
2174 if (err < 0)
2175 return err;
2176
2177
2178
2179
2180 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2181 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2182 filter.flags)
2183 return skb->len;
2184 }
2185
2186 index = cb->args[0];
2187 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2188 index = MPLS_LABEL_FIRST_UNRESERVED;
2189
2190 platform_label = rtnl_dereference(net->mpls.platform_label);
2191 platform_labels = net->mpls.platform_labels;
2192
2193 if (filter.filter_set)
2194 flags |= NLM_F_DUMP_FILTERED;
2195
2196 for (; index < platform_labels; index++) {
2197 struct mpls_route *rt;
2198
2199 rt = rtnl_dereference(platform_label[index]);
2200 if (!rt)
2201 continue;
2202
2203 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2204 (filter.protocol && rt->rt_protocol != filter.protocol))
2205 continue;
2206
2207 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2208 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2209 index, rt, flags) < 0)
2210 break;
2211 }
2212 cb->args[0] = index;
2213
2214 return skb->len;
2215}
2216
2217static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2218{
2219 size_t payload =
2220 NLMSG_ALIGN(sizeof(struct rtmsg))
2221 + nla_total_size(4)
2222 + nla_total_size(1);
2223
2224 if (rt->rt_nhn == 1) {
2225 struct mpls_nh *nh = rt->rt_nh;
2226
2227 if (nh->nh_dev)
2228 payload += nla_total_size(4);
2229 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2230 payload += nla_total_size(2 + nh->nh_via_alen);
2231 if (nh->nh_labels)
2232 payload += nla_total_size(nh->nh_labels * 4);
2233 } else {
2234
2235 size_t nhsize = 0;
2236
2237 for_nexthops(rt) {
2238 if (!rtnl_dereference(nh->nh_dev))
2239 continue;
2240 nhsize += nla_total_size(sizeof(struct rtnexthop));
2241
2242 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2243 nhsize += nla_total_size(2 + nh->nh_via_alen);
2244 if (nh->nh_labels)
2245 nhsize += nla_total_size(nh->nh_labels * 4);
2246 } endfor_nexthops(rt);
2247
2248 payload += nla_total_size(nhsize);
2249 }
2250
2251 return payload;
2252}
2253
2254static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2255 struct nlmsghdr *nlh, struct net *net, u32 portid,
2256 unsigned int nlm_flags)
2257{
2258 struct sk_buff *skb;
2259 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2260 int err = -ENOBUFS;
2261
2262 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2263 if (skb == NULL)
2264 goto errout;
2265
2266 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2267 if (err < 0) {
2268
2269 WARN_ON(err == -EMSGSIZE);
2270 kfree_skb(skb);
2271 goto errout;
2272 }
2273 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2274
2275 return;
2276errout:
2277 if (err < 0)
2278 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2279}
2280
2281static int mpls_valid_getroute_req(struct sk_buff *skb,
2282 const struct nlmsghdr *nlh,
2283 struct nlattr **tb,
2284 struct netlink_ext_ack *extack)
2285{
2286 struct rtmsg *rtm;
2287 int i, err;
2288
2289 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2290 NL_SET_ERR_MSG_MOD(extack,
2291 "Invalid header for get route request");
2292 return -EINVAL;
2293 }
2294
2295 if (!netlink_strict_get_check(skb))
2296 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2297 rtm_mpls_policy, extack);
2298
2299 rtm = nlmsg_data(nlh);
2300 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
2301 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
2302 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
2303 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
2304 return -EINVAL;
2305 }
2306 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
2307 NL_SET_ERR_MSG_MOD(extack,
2308 "Invalid flags for get route request");
2309 return -EINVAL;
2310 }
2311
2312 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2313 rtm_mpls_policy, extack);
2314 if (err)
2315 return err;
2316
2317 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
2318 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
2319 return -EINVAL;
2320 }
2321
2322 for (i = 0; i <= RTA_MAX; i++) {
2323 if (!tb[i])
2324 continue;
2325
2326 switch (i) {
2327 case RTA_DST:
2328 case RTA_NEWDST:
2329 break;
2330 default:
2331 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
2332 return -EINVAL;
2333 }
2334 }
2335
2336 return 0;
2337}
2338
2339static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2340 struct netlink_ext_ack *extack)
2341{
2342 struct net *net = sock_net(in_skb->sk);
2343 u32 portid = NETLINK_CB(in_skb).portid;
2344 u32 in_label = LABEL_NOT_SPECIFIED;
2345 struct nlattr *tb[RTA_MAX + 1];
2346 u32 labels[MAX_NEW_LABELS];
2347 struct mpls_shim_hdr *hdr;
2348 unsigned int hdr_size = 0;
2349 struct net_device *dev;
2350 struct mpls_route *rt;
2351 struct rtmsg *rtm, *r;
2352 struct nlmsghdr *nlh;
2353 struct sk_buff *skb;
2354 struct mpls_nh *nh;
2355 u8 n_labels;
2356 int err;
2357
2358 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack);
2359 if (err < 0)
2360 goto errout;
2361
2362 rtm = nlmsg_data(in_nlh);
2363
2364 if (tb[RTA_DST]) {
2365 u8 label_count;
2366
2367 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2368 &in_label, extack)) {
2369 err = -EINVAL;
2370 goto errout;
2371 }
2372
2373 if (!mpls_label_ok(net, &in_label, extack)) {
2374 err = -EINVAL;
2375 goto errout;
2376 }
2377 }
2378
2379 rt = mpls_route_input_rcu(net, in_label);
2380 if (!rt) {
2381 err = -ENETUNREACH;
2382 goto errout;
2383 }
2384
2385 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2386 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2387 if (!skb) {
2388 err = -ENOBUFS;
2389 goto errout;
2390 }
2391
2392 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2393 RTM_NEWROUTE, in_label, rt, 0);
2394 if (err < 0) {
2395
2396 WARN_ON(err == -EMSGSIZE);
2397 goto errout_free;
2398 }
2399
2400 return rtnl_unicast(skb, net, portid);
2401 }
2402
2403 if (tb[RTA_NEWDST]) {
2404 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2405 labels, extack) != 0) {
2406 err = -EINVAL;
2407 goto errout;
2408 }
2409
2410 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2411 }
2412
2413 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2414 if (!skb) {
2415 err = -ENOBUFS;
2416 goto errout;
2417 }
2418
2419 skb->protocol = htons(ETH_P_MPLS_UC);
2420
2421 if (hdr_size) {
2422 bool bos;
2423 int i;
2424
2425 if (skb_cow(skb, hdr_size)) {
2426 err = -ENOBUFS;
2427 goto errout_free;
2428 }
2429
2430 skb_reserve(skb, hdr_size);
2431 skb_push(skb, hdr_size);
2432 skb_reset_network_header(skb);
2433
2434
2435 hdr = mpls_hdr(skb);
2436 bos = true;
2437 for (i = n_labels - 1; i >= 0; i--) {
2438 hdr[i] = mpls_entry_encode(labels[i],
2439 1, 0, bos);
2440 bos = false;
2441 }
2442 }
2443
2444 nh = mpls_select_multipath(rt, skb);
2445 if (!nh) {
2446 err = -ENETUNREACH;
2447 goto errout_free;
2448 }
2449
2450 if (hdr_size) {
2451 skb_pull(skb, hdr_size);
2452 skb_reset_network_header(skb);
2453 }
2454
2455 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2456 RTM_NEWROUTE, sizeof(*r), 0);
2457 if (!nlh) {
2458 err = -EMSGSIZE;
2459 goto errout_free;
2460 }
2461
2462 r = nlmsg_data(nlh);
2463 r->rtm_family = AF_MPLS;
2464 r->rtm_dst_len = 20;
2465 r->rtm_src_len = 0;
2466 r->rtm_table = RT_TABLE_MAIN;
2467 r->rtm_type = RTN_UNICAST;
2468 r->rtm_scope = RT_SCOPE_UNIVERSE;
2469 r->rtm_protocol = rt->rt_protocol;
2470 r->rtm_flags = 0;
2471
2472 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2473 goto nla_put_failure;
2474
2475 if (nh->nh_labels &&
2476 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2477 nh->nh_label))
2478 goto nla_put_failure;
2479
2480 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2481 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2482 nh->nh_via_alen))
2483 goto nla_put_failure;
2484 dev = rtnl_dereference(nh->nh_dev);
2485 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2486 goto nla_put_failure;
2487
2488 nlmsg_end(skb, nlh);
2489
2490 err = rtnl_unicast(skb, net, portid);
2491errout:
2492 return err;
2493
2494nla_put_failure:
2495 nlmsg_cancel(skb, nlh);
2496 err = -EMSGSIZE;
2497errout_free:
2498 kfree_skb(skb);
2499 return err;
2500}
2501
2502static int resize_platform_label_table(struct net *net, size_t limit)
2503{
2504 size_t size = sizeof(struct mpls_route *) * limit;
2505 size_t old_limit;
2506 size_t cp_size;
2507 struct mpls_route __rcu **labels = NULL, **old;
2508 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2509 unsigned index;
2510
2511 if (size) {
2512 labels = kvzalloc(size, GFP_KERNEL);
2513 if (!labels)
2514 goto nolabels;
2515 }
2516
2517
2518 if (limit > MPLS_LABEL_IPV4NULL) {
2519 struct net_device *lo = net->loopback_dev;
2520 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2521 if (IS_ERR(rt0))
2522 goto nort0;
2523 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
2524 rt0->rt_protocol = RTPROT_KERNEL;
2525 rt0->rt_payload_type = MPT_IPV4;
2526 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2527 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2528 rt0->rt_nh->nh_via_alen = lo->addr_len;
2529 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2530 lo->addr_len);
2531 }
2532 if (limit > MPLS_LABEL_IPV6NULL) {
2533 struct net_device *lo = net->loopback_dev;
2534 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2535 if (IS_ERR(rt2))
2536 goto nort2;
2537 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
2538 rt2->rt_protocol = RTPROT_KERNEL;
2539 rt2->rt_payload_type = MPT_IPV6;
2540 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2541 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2542 rt2->rt_nh->nh_via_alen = lo->addr_len;
2543 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2544 lo->addr_len);
2545 }
2546
2547 rtnl_lock();
2548
2549 old = rtnl_dereference(net->mpls.platform_label);
2550 old_limit = net->mpls.platform_labels;
2551
2552
2553 for (index = limit; index < old_limit; index++)
2554 mpls_route_update(net, index, NULL, NULL);
2555
2556
2557 cp_size = size;
2558 if (old_limit < limit)
2559 cp_size = old_limit * sizeof(struct mpls_route *);
2560
2561 memcpy(labels, old, cp_size);
2562
2563
2564 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2565 (limit > MPLS_LABEL_IPV6NULL)) {
2566 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2567 rt2 = NULL;
2568 }
2569
2570 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2571 (limit > MPLS_LABEL_IPV4NULL)) {
2572 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2573 rt0 = NULL;
2574 }
2575
2576
2577 net->mpls.platform_labels = limit;
2578 rcu_assign_pointer(net->mpls.platform_label, labels);
2579
2580 rtnl_unlock();
2581
2582 mpls_rt_free(rt2);
2583 mpls_rt_free(rt0);
2584
2585 if (old) {
2586 synchronize_rcu();
2587 kvfree(old);
2588 }
2589 return 0;
2590
2591nort2:
2592 mpls_rt_free(rt0);
2593nort0:
2594 kvfree(labels);
2595nolabels:
2596 return -ENOMEM;
2597}
2598
2599static int mpls_platform_labels(struct ctl_table *table, int write,
2600 void __user *buffer, size_t *lenp, loff_t *ppos)
2601{
2602 struct net *net = table->data;
2603 int platform_labels = net->mpls.platform_labels;
2604 int ret;
2605 struct ctl_table tmp = {
2606 .procname = table->procname,
2607 .data = &platform_labels,
2608 .maxlen = sizeof(int),
2609 .mode = table->mode,
2610 .extra1 = &zero,
2611 .extra2 = &label_limit,
2612 };
2613
2614 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2615
2616 if (write && ret == 0)
2617 ret = resize_platform_label_table(net, platform_labels);
2618
2619 return ret;
2620}
2621
2622#define MPLS_NS_SYSCTL_OFFSET(field) \
2623 (&((struct net *)0)->field)
2624
2625static const struct ctl_table mpls_table[] = {
2626 {
2627 .procname = "platform_labels",
2628 .data = NULL,
2629 .maxlen = sizeof(int),
2630 .mode = 0644,
2631 .proc_handler = mpls_platform_labels,
2632 },
2633 {
2634 .procname = "ip_ttl_propagate",
2635 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2636 .maxlen = sizeof(int),
2637 .mode = 0644,
2638 .proc_handler = proc_dointvec_minmax,
2639 .extra1 = &zero,
2640 .extra2 = &one,
2641 },
2642 {
2643 .procname = "default_ttl",
2644 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2645 .maxlen = sizeof(int),
2646 .mode = 0644,
2647 .proc_handler = proc_dointvec_minmax,
2648 .extra1 = &one,
2649 .extra2 = &ttl_max,
2650 },
2651 { }
2652};
2653
2654static int mpls_net_init(struct net *net)
2655{
2656 struct ctl_table *table;
2657 int i;
2658
2659 net->mpls.platform_labels = 0;
2660 net->mpls.platform_label = NULL;
2661 net->mpls.ip_ttl_propagate = 1;
2662 net->mpls.default_ttl = 255;
2663
2664 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2665 if (table == NULL)
2666 return -ENOMEM;
2667
2668
2669
2670
2671 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2672 table[i].data = (char *)net + (uintptr_t)table[i].data;
2673
2674 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
2675 if (net->mpls.ctl == NULL) {
2676 kfree(table);
2677 return -ENOMEM;
2678 }
2679
2680 return 0;
2681}
2682
2683static void mpls_net_exit(struct net *net)
2684{
2685 struct mpls_route __rcu **platform_label;
2686 size_t platform_labels;
2687 struct ctl_table *table;
2688 unsigned int index;
2689
2690 table = net->mpls.ctl->ctl_table_arg;
2691 unregister_net_sysctl_table(net->mpls.ctl);
2692 kfree(table);
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703 rtnl_lock();
2704 platform_label = rtnl_dereference(net->mpls.platform_label);
2705 platform_labels = net->mpls.platform_labels;
2706 for (index = 0; index < platform_labels; index++) {
2707 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2708 RCU_INIT_POINTER(platform_label[index], NULL);
2709 mpls_notify_route(net, index, rt, NULL, NULL);
2710 mpls_rt_free(rt);
2711 }
2712 rtnl_unlock();
2713
2714 kvfree(platform_label);
2715}
2716
2717static struct pernet_operations mpls_net_ops = {
2718 .init = mpls_net_init,
2719 .exit = mpls_net_exit,
2720};
2721
2722static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2723 .family = AF_MPLS,
2724 .fill_stats_af = mpls_fill_stats_af,
2725 .get_stats_af_size = mpls_get_stats_af_size,
2726};
2727
2728static int __init mpls_init(void)
2729{
2730 int err;
2731
2732 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2733
2734 err = register_pernet_subsys(&mpls_net_ops);
2735 if (err)
2736 goto out;
2737
2738 err = register_netdevice_notifier(&mpls_dev_notifier);
2739 if (err)
2740 goto out_unregister_pernet;
2741
2742 dev_add_pack(&mpls_packet_type);
2743
2744 rtnl_af_register(&mpls_af_ops);
2745
2746 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2747 mpls_rtm_newroute, NULL, 0);
2748 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2749 mpls_rtm_delroute, NULL, 0);
2750 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2751 mpls_getroute, mpls_dump_routes, 0);
2752 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2753 mpls_netconf_get_devconf,
2754 mpls_netconf_dump_devconf, 0);
2755 err = ipgre_tunnel_encap_add_mpls_ops();
2756 if (err)
2757 pr_err("Can't add mpls over gre tunnel ops\n");
2758
2759 err = 0;
2760out:
2761 return err;
2762
2763out_unregister_pernet:
2764 unregister_pernet_subsys(&mpls_net_ops);
2765 goto out;
2766}
2767module_init(mpls_init);
2768
2769static void __exit mpls_exit(void)
2770{
2771 rtnl_unregister_all(PF_MPLS);
2772 rtnl_af_unregister(&mpls_af_ops);
2773 dev_remove_pack(&mpls_packet_type);
2774 unregister_netdevice_notifier(&mpls_dev_notifier);
2775 unregister_pernet_subsys(&mpls_net_ops);
2776 ipgre_tunnel_encap_del_mpls_ops();
2777}
2778module_exit(mpls_exit);
2779
2780MODULE_DESCRIPTION("MultiProtocol Label Switching");
2781MODULE_LICENSE("GPL v2");
2782MODULE_ALIAS_NETPROTO(PF_MPLS);
2783
