1#include <linux/types.h>
2#include <linux/skbuff.h>
3#include <linux/socket.h>
4#include <linux/sysctl.h>
5#include <linux/net.h>
6#include <linux/module.h>
7#include <linux/if_arp.h>
8#include <linux/ipv6.h>
9#include <linux/mpls.h>
10#include <linux/vmalloc.h>
11#include <net/ip.h>
12#include <net/dst.h>
13#include <net/sock.h>
14#include <net/arp.h>
15#include <net/ip_fib.h>
16#include <net/netevent.h>
17#include <net/netns/generic.h>
18#if IS_ENABLED(CONFIG_IPV6)
19#include <net/ipv6.h>
20#include <net/addrconf.h>
21#endif
22#include <net/nexthop.h>
23#include "internal.h"
24
25
26
27
28#define MAX_MP_SELECT_LABELS 4
29
30#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
31
32static int zero = 0;
33static int label_limit = (1 << 20) - 1;
34
35static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
36 struct nlmsghdr *nlh, struct net *net, u32 portid,
37 unsigned int nlm_flags);
38
39static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
40{
41 struct mpls_route *rt = NULL;
42
43 if (index < net->mpls.platform_labels) {
44 struct mpls_route __rcu **platform_label =
45 rcu_dereference(net->mpls.platform_label);
46 rt = rcu_dereference(platform_label[index]);
47 }
48 return rt;
49}
50
51static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev)
52{
53 return rcu_dereference_rtnl(dev->mpls_ptr);
54}
55
56bool mpls_output_possible(const struct net_device *dev)
57{
58 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
59}
60EXPORT_SYMBOL_GPL(mpls_output_possible);
61
62static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
63{
64 u8 *nh0_via = PTR_ALIGN((u8 *)&rt->rt_nh[rt->rt_nhn], VIA_ALEN_ALIGN);
65 int nh_index = nh - rt->rt_nh;
66
67 return nh0_via + rt->rt_max_alen * nh_index;
68}
69
70static const u8 *mpls_nh_via(const struct mpls_route *rt,
71 const struct mpls_nh *nh)
72{
73 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
74}
75
76static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
77{
78
79 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
80}
81
82unsigned int mpls_dev_mtu(const struct net_device *dev)
83{
84
85 return dev->mtu;
86}
87EXPORT_SYMBOL_GPL(mpls_dev_mtu);
88
89bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
90{
91 if (skb->len <= mtu)
92 return false;
93
94 if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu))
95 return false;
96
97 return true;
98}
99EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
100
101static u32 mpls_multipath_hash(struct mpls_route *rt,
102 struct sk_buff *skb, bool bos)
103{
104 struct mpls_entry_decoded dec;
105 struct mpls_shim_hdr *hdr;
106 bool eli_seen = false;
107 int label_index;
108 u32 hash = 0;
109
110 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS && !bos;
111 label_index++) {
112 if (!pskb_may_pull(skb, sizeof(*hdr) * label_index))
113 break;
114
115
116 hdr = mpls_hdr(skb) + label_index;
117 dec = mpls_entry_decode(hdr);
118
119
120
121
122 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
123 hash = jhash_1word(dec.label, hash);
124
125
126
127
128
129
130
131 if (eli_seen)
132 break;
133 } else if (dec.label == MPLS_LABEL_ENTROPY) {
134 eli_seen = true;
135 }
136
137 bos = dec.bos;
138 if (bos && pskb_may_pull(skb, sizeof(*hdr) * label_index +
139 sizeof(struct iphdr))) {
140 const struct iphdr *v4hdr;
141
142 v4hdr = (const struct iphdr *)(mpls_hdr(skb) +
143 label_index);
144 if (v4hdr->version == 4) {
145 hash = jhash_3words(ntohl(v4hdr->saddr),
146 ntohl(v4hdr->daddr),
147 v4hdr->protocol, hash);
148 } else if (v4hdr->version == 6 &&
149 pskb_may_pull(skb, sizeof(*hdr) * label_index +
150 sizeof(struct ipv6hdr))) {
151 const struct ipv6hdr *v6hdr;
152
153 v6hdr = (const struct ipv6hdr *)(mpls_hdr(skb) +
154 label_index);
155
156 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
157 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
158 hash = jhash_1word(v6hdr->nexthdr, hash);
159 }
160 }
161 }
162
163 return hash;
164}
165
166static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
167 struct sk_buff *skb, bool bos)
168{
169 int alive = ACCESS_ONCE(rt->rt_nhn_alive);
170 u32 hash = 0;
171 int nh_index = 0;
172 int n = 0;
173
174
175
176
177 if (rt->rt_nhn == 1)
178 goto out;
179
180 if (alive <= 0)
181 return NULL;
182
183 hash = mpls_multipath_hash(rt, skb, bos);
184 nh_index = hash % alive;
185 if (alive == rt->rt_nhn)
186 goto out;
187 for_nexthops(rt) {
188 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
189 continue;
190 if (n == nh_index)
191 return nh;
192 n++;
193 } endfor_nexthops(rt);
194
195out:
196 return &rt->rt_nh[nh_index];
197}
198
199static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb,
200 struct mpls_entry_decoded dec)
201{
202 enum mpls_payload_type payload_type;
203 bool success = false;
204
205
206
207
208
209
210
211
212
213
214
215 if (!pskb_may_pull(skb, 12))
216 return false;
217
218 payload_type = rt->rt_payload_type;
219 if (payload_type == MPT_UNSPEC)
220 payload_type = ip_hdr(skb)->version;
221
222 switch (payload_type) {
223 case MPT_IPV4: {
224 struct iphdr *hdr4 = ip_hdr(skb);
225 skb->protocol = htons(ETH_P_IP);
226 csum_replace2(&hdr4->check,
227 htons(hdr4->ttl << 8),
228 htons(dec.ttl << 8));
229 hdr4->ttl = dec.ttl;
230 success = true;
231 break;
232 }
233 case MPT_IPV6: {
234 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
235 skb->protocol = htons(ETH_P_IPV6);
236 hdr6->hop_limit = dec.ttl;
237 success = true;
238 break;
239 }
240 case MPT_UNSPEC:
241 break;
242 }
243
244 return success;
245}
246
247static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
248 struct packet_type *pt, struct net_device *orig_dev)
249{
250 struct net *net = dev_net(dev);
251 struct mpls_shim_hdr *hdr;
252 struct mpls_route *rt;
253 struct mpls_nh *nh;
254 struct mpls_entry_decoded dec;
255 struct net_device *out_dev;
256 struct mpls_dev *mdev;
257 unsigned int hh_len;
258 unsigned int new_header_size;
259 unsigned int mtu;
260 int err;
261
262
263
264 mdev = mpls_dev_get(dev);
265 if (!mdev || !mdev->input_enabled)
266 goto drop;
267
268 if (skb->pkt_type != PACKET_HOST)
269 goto drop;
270
271 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
272 goto drop;
273
274 if (!pskb_may_pull(skb, sizeof(*hdr)))
275 goto drop;
276
277
278 hdr = mpls_hdr(skb);
279 dec = mpls_entry_decode(hdr);
280
281
282 skb_pull(skb, sizeof(*hdr));
283 skb_reset_network_header(skb);
284
285 skb_orphan(skb);
286
287 rt = mpls_route_input_rcu(net, dec.label);
288 if (!rt)
289 goto drop;
290
291 nh = mpls_select_multipath(rt, skb, dec.bos);
292 if (!nh)
293 goto drop;
294
295
296 out_dev = rcu_dereference(nh->nh_dev);
297 if (!mpls_output_possible(out_dev))
298 goto drop;
299
300 if (skb_warn_if_lro(skb))
301 goto drop;
302
303 skb_forward_csum(skb);
304
305
306 if (dec.ttl <= 1)
307 goto drop;
308 dec.ttl -= 1;
309
310
311 new_header_size = mpls_nh_header_size(nh);
312 mtu = mpls_dev_mtu(out_dev);
313 if (mpls_pkt_too_big(skb, mtu - new_header_size))
314 goto drop;
315
316 hh_len = LL_RESERVED_SPACE(out_dev);
317 if (!out_dev->header_ops)
318 hh_len = 0;
319
320
321 if (skb_cow(skb, hh_len + new_header_size))
322 goto drop;
323
324 skb->dev = out_dev;
325 skb->protocol = htons(ETH_P_MPLS_UC);
326
327 if (unlikely(!new_header_size && dec.bos)) {
328
329 if (!mpls_egress(rt, skb, dec))
330 goto drop;
331 } else {
332 bool bos;
333 int i;
334 skb_push(skb, new_header_size);
335 skb_reset_network_header(skb);
336
337 hdr = mpls_hdr(skb);
338 bos = dec.bos;
339 for (i = nh->nh_labels - 1; i >= 0; i--) {
340 hdr[i] = mpls_entry_encode(nh->nh_label[i],
341 dec.ttl, 0, bos);
342 bos = false;
343 }
344 }
345
346
347 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
348 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
349 out_dev->dev_addr, skb);
350 else
351 err = neigh_xmit(nh->nh_via_table, out_dev,
352 mpls_nh_via(rt, nh), skb);
353 if (err)
354 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
355 __func__, err);
356 return 0;
357
358drop:
359 kfree_skb(skb);
360 return NET_RX_DROP;
361}
362
363static struct packet_type mpls_packet_type __read_mostly = {
364 .type = cpu_to_be16(ETH_P_MPLS_UC),
365 .func = mpls_forward,
366};
367
368static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
369 [RTA_DST] = { .type = NLA_U32 },
370 [RTA_OIF] = { .type = NLA_U32 },
371};
372
373struct mpls_route_config {
374 u32 rc_protocol;
375 u32 rc_ifindex;
376 u8 rc_via_table;
377 u8 rc_via_alen;
378 u8 rc_via[MAX_VIA_ALEN];
379 u32 rc_label;
380 u8 rc_output_labels;
381 u32 rc_output_label[MAX_NEW_LABELS];
382 u32 rc_nlflags;
383 enum mpls_payload_type rc_payload_type;
384 struct nl_info rc_nlinfo;
385 struct rtnexthop *rc_mp;
386 int rc_mp_len;
387};
388
389static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen)
390{
391 u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN);
392 struct mpls_route *rt;
393
394 rt = kzalloc(ALIGN(sizeof(*rt) + num_nh * sizeof(*rt->rt_nh),
395 VIA_ALEN_ALIGN) +
396 num_nh * max_alen_aligned,
397 GFP_KERNEL);
398 if (rt) {
399 rt->rt_nhn = num_nh;
400 rt->rt_nhn_alive = num_nh;
401 rt->rt_max_alen = max_alen_aligned;
402 }
403
404 return rt;
405}
406
407static void mpls_rt_free(struct mpls_route *rt)
408{
409 if (rt)
410 kfree_rcu(rt, rt_rcu);
411}
412
413static void mpls_notify_route(struct net *net, unsigned index,
414 struct mpls_route *old, struct mpls_route *new,
415 const struct nl_info *info)
416{
417 struct nlmsghdr *nlh = info ? info->nlh : NULL;
418 unsigned portid = info ? info->portid : 0;
419 int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
420 struct mpls_route *rt = new ? new : old;
421 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
422
423 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
424 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
425}
426
427static void mpls_route_update(struct net *net, unsigned index,
428 struct mpls_route *new,
429 const struct nl_info *info)
430{
431 struct mpls_route __rcu **platform_label;
432 struct mpls_route *rt;
433
434 ASSERT_RTNL();
435
436 platform_label = rtnl_dereference(net->mpls.platform_label);
437 rt = rtnl_dereference(platform_label[index]);
438 rcu_assign_pointer(platform_label[index], new);
439
440 mpls_notify_route(net, index, rt, new, info);
441
442
443 mpls_rt_free(rt);
444}
445
446static unsigned find_free_label(struct net *net)
447{
448 struct mpls_route __rcu **platform_label;
449 size_t platform_labels;
450 unsigned index;
451
452 platform_label = rtnl_dereference(net->mpls.platform_label);
453 platform_labels = net->mpls.platform_labels;
454 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
455 index++) {
456 if (!rtnl_dereference(platform_label[index]))
457 return index;
458 }
459 return LABEL_NOT_SPECIFIED;
460}
461
462#if IS_ENABLED(CONFIG_INET)
463static struct net_device *inet_fib_lookup_dev(struct net *net,
464 const void *addr)
465{
466 struct net_device *dev;
467 struct rtable *rt;
468 struct in_addr daddr;
469
470 memcpy(&daddr, addr, sizeof(struct in_addr));
471 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
472 if (IS_ERR(rt))
473 return ERR_CAST(rt);
474
475 dev = rt->dst.dev;
476 dev_hold(dev);
477
478 ip_rt_put(rt);
479
480 return dev;
481}
482#else
483static struct net_device *inet_fib_lookup_dev(struct net *net,
484 const void *addr)
485{
486 return ERR_PTR(-EAFNOSUPPORT);
487}
488#endif
489
490#if IS_ENABLED(CONFIG_IPV6)
491static struct net_device *inet6_fib_lookup_dev(struct net *net,
492 const void *addr)
493{
494 struct net_device *dev;
495 struct dst_entry *dst;
496 struct flowi6 fl6;
497 int err;
498
499 if (!ipv6_stub)
500 return ERR_PTR(-EAFNOSUPPORT);
501
502 memset(&fl6, 0, sizeof(fl6));
503 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
504 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
505 if (err)
506 return ERR_PTR(err);
507
508 dev = dst->dev;
509 dev_hold(dev);
510 dst_release(dst);
511
512 return dev;
513}
514#else
515static struct net_device *inet6_fib_lookup_dev(struct net *net,
516 const void *addr)
517{
518 return ERR_PTR(-EAFNOSUPPORT);
519}
520#endif
521
522static struct net_device *find_outdev(struct net *net,
523 struct mpls_route *rt,
524 struct mpls_nh *nh, int oif)
525{
526 struct net_device *dev = NULL;
527
528 if (!oif) {
529 switch (nh->nh_via_table) {
530 case NEIGH_ARP_TABLE:
531 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
532 break;
533 case NEIGH_ND_TABLE:
534 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
535 break;
536 case NEIGH_LINK_TABLE:
537 break;
538 }
539 } else {
540 dev = dev_get_by_index(net, oif);
541 }
542
543 if (!dev)
544 return ERR_PTR(-ENODEV);
545
546 if (IS_ERR(dev))
547 return dev;
548
549
550 dev_put(dev);
551
552 return dev;
553}
554
555static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
556 struct mpls_nh *nh, int oif)
557{
558 struct net_device *dev = NULL;
559 int err = -ENODEV;
560
561 dev = find_outdev(net, rt, nh, oif);
562 if (IS_ERR(dev)) {
563 err = PTR_ERR(dev);
564 dev = NULL;
565 goto errout;
566 }
567
568
569 err = -EINVAL;
570 if (!mpls_dev_get(dev))
571 goto errout;
572
573 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
574 (dev->addr_len != nh->nh_via_alen))
575 goto errout;
576
577 RCU_INIT_POINTER(nh->nh_dev, dev);
578
579 if (!(dev->flags & IFF_UP)) {
580 nh->nh_flags |= RTNH_F_DEAD;
581 } else {
582 unsigned int flags;
583
584 flags = dev_get_flags(dev);
585 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
586 nh->nh_flags |= RTNH_F_LINKDOWN;
587 }
588
589 return 0;
590
591errout:
592 return err;
593}
594
595static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
596 struct mpls_route *rt)
597{
598 struct net *net = cfg->rc_nlinfo.nl_net;
599 struct mpls_nh *nh = rt->rt_nh;
600 int err;
601 int i;
602
603 if (!nh)
604 return -ENOMEM;
605
606 err = -EINVAL;
607
608 if (cfg->rc_output_labels > MAX_NEW_LABELS)
609 goto errout;
610
611 nh->nh_labels = cfg->rc_output_labels;
612 for (i = 0; i < nh->nh_labels; i++)
613 nh->nh_label[i] = cfg->rc_output_label[i];
614
615 nh->nh_via_table = cfg->rc_via_table;
616 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
617 nh->nh_via_alen = cfg->rc_via_alen;
618
619 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
620 if (err)
621 goto errout;
622
623 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
624 rt->rt_nhn_alive--;
625
626 return 0;
627
628errout:
629 return err;
630}
631
632static int mpls_nh_build(struct net *net, struct mpls_route *rt,
633 struct mpls_nh *nh, int oif, struct nlattr *via,
634 struct nlattr *newdst)
635{
636 int err = -ENOMEM;
637
638 if (!nh)
639 goto errout;
640
641 if (newdst) {
642 err = nla_get_labels(newdst, MAX_NEW_LABELS,
643 &nh->nh_labels, nh->nh_label);
644 if (err)
645 goto errout;
646 }
647
648 if (via) {
649 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
650 __mpls_nh_via(rt, nh));
651 if (err)
652 goto errout;
653 } else {
654 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
655 }
656
657 err = mpls_nh_assign_dev(net, rt, nh, oif);
658 if (err)
659 goto errout;
660
661 return 0;
662
663errout:
664 return err;
665}
666
667static int mpls_count_nexthops(struct rtnexthop *rtnh, int len,
668 u8 cfg_via_alen, u8 *max_via_alen)
669{
670 int nhs = 0;
671 int remaining = len;
672
673 if (!rtnh) {
674 *max_via_alen = cfg_via_alen;
675 return 1;
676 }
677
678 *max_via_alen = 0;
679
680 while (rtnh_ok(rtnh, remaining)) {
681 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
682 int attrlen;
683
684 attrlen = rtnh_attrlen(rtnh);
685 nla = nla_find(attrs, attrlen, RTA_VIA);
686 if (nla && nla_len(nla) >=
687 offsetof(struct rtvia, rtvia_addr)) {
688 int via_alen = nla_len(nla) -
689 offsetof(struct rtvia, rtvia_addr);
690
691 if (via_alen <= MAX_VIA_ALEN)
692 *max_via_alen = max_t(u16, *max_via_alen,
693 via_alen);
694 }
695
696 nhs++;
697 rtnh = rtnh_next(rtnh, &remaining);
698 }
699
700
701 return remaining > 0 ? 0 : nhs;
702}
703
704static int mpls_nh_build_multi(struct mpls_route_config *cfg,
705 struct mpls_route *rt)
706{
707 struct rtnexthop *rtnh = cfg->rc_mp;
708 struct nlattr *nla_via, *nla_newdst;
709 int remaining = cfg->rc_mp_len;
710 int nhs = 0;
711 int err = 0;
712
713 change_nexthops(rt) {
714 int attrlen;
715
716 nla_via = NULL;
717 nla_newdst = NULL;
718
719 err = -EINVAL;
720 if (!rtnh_ok(rtnh, remaining))
721 goto errout;
722
723
724
725
726 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
727 goto errout;
728
729 attrlen = rtnh_attrlen(rtnh);
730 if (attrlen > 0) {
731 struct nlattr *attrs = rtnh_attrs(rtnh);
732
733 nla_via = nla_find(attrs, attrlen, RTA_VIA);
734 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
735 }
736
737 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
738 rtnh->rtnh_ifindex, nla_via, nla_newdst);
739 if (err)
740 goto errout;
741
742 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
743 rt->rt_nhn_alive--;
744
745 rtnh = rtnh_next(rtnh, &remaining);
746 nhs++;
747 } endfor_nexthops(rt);
748
749 rt->rt_nhn = nhs;
750
751 return 0;
752
753errout:
754 return err;
755}
756
757static int mpls_route_add(struct mpls_route_config *cfg)
758{
759 struct mpls_route __rcu **platform_label;
760 struct net *net = cfg->rc_nlinfo.nl_net;
761 struct mpls_route *rt, *old;
762 int err = -EINVAL;
763 u8 max_via_alen;
764 unsigned index;
765 int nhs;
766
767 index = cfg->rc_label;
768
769
770 if ((index == LABEL_NOT_SPECIFIED) &&
771 (cfg->rc_nlflags & NLM_F_CREATE)) {
772 index = find_free_label(net);
773 }
774
775
776 if (index < MPLS_LABEL_FIRST_UNRESERVED)
777 goto errout;
778
779
780 if (index >= net->mpls.platform_labels)
781 goto errout;
782
783
784 err = -EOPNOTSUPP;
785 if (cfg->rc_nlflags & NLM_F_APPEND)
786 goto errout;
787
788 err = -EEXIST;
789 platform_label = rtnl_dereference(net->mpls.platform_label);
790 old = rtnl_dereference(platform_label[index]);
791 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
792 goto errout;
793
794 err = -EEXIST;
795 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
796 goto errout;
797
798 err = -ENOENT;
799 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
800 goto errout;
801
802 err = -EINVAL;
803 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
804 cfg->rc_via_alen, &max_via_alen);
805 if (nhs == 0)
806 goto errout;
807
808 err = -ENOMEM;
809 rt = mpls_rt_alloc(nhs, max_via_alen);
810 if (!rt)
811 goto errout;
812
813 rt->rt_protocol = cfg->rc_protocol;
814 rt->rt_payload_type = cfg->rc_payload_type;
815
816 if (cfg->rc_mp)
817 err = mpls_nh_build_multi(cfg, rt);
818 else
819 err = mpls_nh_build_from_cfg(cfg, rt);
820 if (err)
821 goto freert;
822
823 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
824
825 return 0;
826
827freert:
828 mpls_rt_free(rt);
829errout:
830 return err;
831}
832
833static int mpls_route_del(struct mpls_route_config *cfg)
834{
835 struct net *net = cfg->rc_nlinfo.nl_net;
836 unsigned index;
837 int err = -EINVAL;
838
839 index = cfg->rc_label;
840
841
842 if (index < MPLS_LABEL_FIRST_UNRESERVED)
843 goto errout;
844
845
846 if (index >= net->mpls.platform_labels)
847 goto errout;
848
849 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
850
851 err = 0;
852errout:
853 return err;
854}
855
856#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
857 (&((struct mpls_dev *)0)->field)
858
859static const struct ctl_table mpls_dev_table[] = {
860 {
861 .procname = "input",
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec,
865 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
866 },
867 { }
868};
869
870static int mpls_dev_sysctl_register(struct net_device *dev,
871 struct mpls_dev *mdev)
872{
873 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
874 struct ctl_table *table;
875 int i;
876
877 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
878 if (!table)
879 goto out;
880
881
882
883
884 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++)
885 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
886
887 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
888
889 mdev->sysctl = register_net_sysctl(dev_net(dev), path, table);
890 if (!mdev->sysctl)
891 goto free;
892
893 return 0;
894
895free:
896 kfree(table);
897out:
898 return -ENOBUFS;
899}
900
901static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev)
902{
903 struct ctl_table *table;
904
905 table = mdev->sysctl->ctl_table_arg;
906 unregister_net_sysctl_table(mdev->sysctl);
907 kfree(table);
908}
909
910static struct mpls_dev *mpls_add_dev(struct net_device *dev)
911{
912 struct mpls_dev *mdev;
913 int err = -ENOMEM;
914
915 ASSERT_RTNL();
916
917 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
918 if (!mdev)
919 return ERR_PTR(err);
920
921 err = mpls_dev_sysctl_register(dev, mdev);
922 if (err)
923 goto free;
924
925 rcu_assign_pointer(dev->mpls_ptr, mdev);
926
927 return mdev;
928
929free:
930 kfree(mdev);
931 return ERR_PTR(err);
932}
933
934static void mpls_ifdown(struct net_device *dev, int event)
935{
936 struct mpls_route __rcu **platform_label;
937 struct net *net = dev_net(dev);
938 unsigned index;
939
940 platform_label = rtnl_dereference(net->mpls.platform_label);
941 for (index = 0; index < net->mpls.platform_labels; index++) {
942 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
943
944 if (!rt)
945 continue;
946
947 change_nexthops(rt) {
948 if (rtnl_dereference(nh->nh_dev) != dev)
949 continue;
950 switch (event) {
951 case NETDEV_DOWN:
952 case NETDEV_UNREGISTER:
953 nh->nh_flags |= RTNH_F_DEAD;
954
955 case NETDEV_CHANGE:
956 nh->nh_flags |= RTNH_F_LINKDOWN;
957 ACCESS_ONCE(rt->rt_nhn_alive) = rt->rt_nhn_alive - 1;
958 break;
959 }
960 if (event == NETDEV_UNREGISTER)
961 RCU_INIT_POINTER(nh->nh_dev, NULL);
962 } endfor_nexthops(rt);
963 }
964}
965
966static void mpls_ifup(struct net_device *dev, unsigned int nh_flags)
967{
968 struct mpls_route __rcu **platform_label;
969 struct net *net = dev_net(dev);
970 unsigned index;
971 int alive;
972
973 platform_label = rtnl_dereference(net->mpls.platform_label);
974 for (index = 0; index < net->mpls.platform_labels; index++) {
975 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
976
977 if (!rt)
978 continue;
979
980 alive = 0;
981 change_nexthops(rt) {
982 struct net_device *nh_dev =
983 rtnl_dereference(nh->nh_dev);
984
985 if (!(nh->nh_flags & nh_flags)) {
986 alive++;
987 continue;
988 }
989 if (nh_dev != dev)
990 continue;
991 alive++;
992 nh->nh_flags &= ~nh_flags;
993 } endfor_nexthops(rt);
994
995 ACCESS_ONCE(rt->rt_nhn_alive) = alive;
996 }
997}
998
999static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1000 void *ptr)
1001{
1002 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1003 struct mpls_dev *mdev;
1004 unsigned int flags;
1005
1006 if (event == NETDEV_REGISTER) {
1007
1008 if (dev->type == ARPHRD_ETHER ||
1009 dev->type == ARPHRD_LOOPBACK ||
1010 dev->type == ARPHRD_IPGRE ||
1011 dev->type == ARPHRD_SIT ||
1012 dev->type == ARPHRD_TUNNEL) {
1013 mdev = mpls_add_dev(dev);
1014 if (IS_ERR(mdev))
1015 return notifier_from_errno(PTR_ERR(mdev));
1016 }
1017 return NOTIFY_OK;
1018 }
1019
1020 mdev = mpls_dev_get(dev);
1021 if (!mdev)
1022 return NOTIFY_OK;
1023
1024 switch (event) {
1025 case NETDEV_DOWN:
1026 mpls_ifdown(dev, event);
1027 break;
1028 case NETDEV_UP:
1029 flags = dev_get_flags(dev);
1030 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1031 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1032 else
1033 mpls_ifup(dev, RTNH_F_DEAD);
1034 break;
1035 case NETDEV_CHANGE:
1036 flags = dev_get_flags(dev);
1037 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1038 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1039 else
1040 mpls_ifdown(dev, event);
1041 break;
1042 case NETDEV_UNREGISTER:
1043 mpls_ifdown(dev, event);
1044 mdev = mpls_dev_get(dev);
1045 if (mdev) {
1046 mpls_dev_sysctl_unregister(mdev);
1047 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1048 kfree_rcu(mdev, rcu);
1049 }
1050 break;
1051 case NETDEV_CHANGENAME:
1052 mdev = mpls_dev_get(dev);
1053 if (mdev) {
1054 int err;
1055
1056 mpls_dev_sysctl_unregister(mdev);
1057 err = mpls_dev_sysctl_register(dev, mdev);
1058 if (err)
1059 return notifier_from_errno(err);
1060 }
1061 break;
1062 }
1063 return NOTIFY_OK;
1064}
1065
1066static struct notifier_block mpls_dev_notifier = {
1067 .notifier_call = mpls_dev_notify,
1068};
1069
1070static int nla_put_via(struct sk_buff *skb,
1071 u8 table, const void *addr, int alen)
1072{
1073 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1074 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1075 };
1076 struct nlattr *nla;
1077 struct rtvia *via;
1078 int family = AF_UNSPEC;
1079
1080 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1081 if (!nla)
1082 return -EMSGSIZE;
1083
1084 if (table <= NEIGH_NR_TABLES)
1085 family = table_to_family[table];
1086
1087 via = nla_data(nla);
1088 via->rtvia_family = family;
1089 memcpy(via->rtvia_addr, addr, alen);
1090 return 0;
1091}
1092
1093int nla_put_labels(struct sk_buff *skb, int attrtype,
1094 u8 labels, const u32 label[])
1095{
1096 struct nlattr *nla;
1097 struct mpls_shim_hdr *nla_label;
1098 bool bos;
1099 int i;
1100 nla = nla_reserve(skb, attrtype, labels*4);
1101 if (!nla)
1102 return -EMSGSIZE;
1103
1104 nla_label = nla_data(nla);
1105 bos = true;
1106 for (i = labels - 1; i >= 0; i--) {
1107 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1108 bos = false;
1109 }
1110
1111 return 0;
1112}
1113EXPORT_SYMBOL_GPL(nla_put_labels);
1114
1115int nla_get_labels(const struct nlattr *nla,
1116 u32 max_labels, u8 *labels, u32 label[])
1117{
1118 unsigned len = nla_len(nla);
1119 unsigned nla_labels;
1120 struct mpls_shim_hdr *nla_label;
1121 bool bos;
1122 int i;
1123
1124
1125 if (len & 3)
1126 return -EINVAL;
1127
1128
1129 nla_labels = len/4;
1130 if (nla_labels > max_labels)
1131 return -EINVAL;
1132
1133 nla_label = nla_data(nla);
1134 bos = true;
1135 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1136 struct mpls_entry_decoded dec;
1137 dec = mpls_entry_decode(nla_label + i);
1138
1139
1140
1141
1142 if ((dec.bos != bos) || dec.ttl || dec.tc)
1143 return -EINVAL;
1144
1145 switch (dec.label) {
1146 case MPLS_LABEL_IMPLNULL:
1147
1148
1149
1150
1151 return -EINVAL;
1152 }
1153
1154 label[i] = dec.label;
1155 }
1156 *labels = nla_labels;
1157 return 0;
1158}
1159EXPORT_SYMBOL_GPL(nla_get_labels);
1160
1161int nla_get_via(const struct nlattr *nla, u8 *via_alen,
1162 u8 *via_table, u8 via_addr[])
1163{
1164 struct rtvia *via = nla_data(nla);
1165 int err = -EINVAL;
1166 int alen;
1167
1168 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr))
1169 goto errout;
1170 alen = nla_len(nla) -
1171 offsetof(struct rtvia, rtvia_addr);
1172 if (alen > MAX_VIA_ALEN)
1173 goto errout;
1174
1175
1176 switch (via->rtvia_family) {
1177 case AF_PACKET:
1178 *via_table = NEIGH_LINK_TABLE;
1179 break;
1180 case AF_INET:
1181 *via_table = NEIGH_ARP_TABLE;
1182 if (alen != 4)
1183 goto errout;
1184 break;
1185 case AF_INET6:
1186 *via_table = NEIGH_ND_TABLE;
1187 if (alen != 16)
1188 goto errout;
1189 break;
1190 default:
1191
1192 goto errout;
1193 }
1194
1195 memcpy(via_addr, via->rtvia_addr, alen);
1196 *via_alen = alen;
1197 err = 0;
1198
1199errout:
1200 return err;
1201}
1202
1203static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1204 struct mpls_route_config *cfg)
1205{
1206 struct rtmsg *rtm;
1207 struct nlattr *tb[RTA_MAX+1];
1208 int index;
1209 int err;
1210
1211 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy);
1212 if (err < 0)
1213 goto errout;
1214
1215 err = -EINVAL;
1216 rtm = nlmsg_data(nlh);
1217 memset(cfg, 0, sizeof(*cfg));
1218
1219 if (rtm->rtm_family != AF_MPLS)
1220 goto errout;
1221 if (rtm->rtm_dst_len != 20)
1222 goto errout;
1223 if (rtm->rtm_src_len != 0)
1224 goto errout;
1225 if (rtm->rtm_tos != 0)
1226 goto errout;
1227 if (rtm->rtm_table != RT_TABLE_MAIN)
1228 goto errout;
1229
1230
1231
1232
1233
1234
1235 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE)
1236 goto errout;
1237 if (rtm->rtm_type != RTN_UNICAST)
1238 goto errout;
1239 if (rtm->rtm_flags != 0)
1240 goto errout;
1241
1242 cfg->rc_label = LABEL_NOT_SPECIFIED;
1243 cfg->rc_protocol = rtm->rtm_protocol;
1244 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1245 cfg->rc_nlflags = nlh->nlmsg_flags;
1246 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1247 cfg->rc_nlinfo.nlh = nlh;
1248 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1249
1250 for (index = 0; index <= RTA_MAX; index++) {
1251 struct nlattr *nla = tb[index];
1252 if (!nla)
1253 continue;
1254
1255 switch (index) {
1256 case RTA_OIF:
1257 cfg->rc_ifindex = nla_get_u32(nla);
1258 break;
1259 case RTA_NEWDST:
1260 if (nla_get_labels(nla, MAX_NEW_LABELS,
1261 &cfg->rc_output_labels,
1262 cfg->rc_output_label))
1263 goto errout;
1264 break;
1265 case RTA_DST:
1266 {
1267 u8 label_count;
1268 if (nla_get_labels(nla, 1, &label_count,
1269 &cfg->rc_label))
1270 goto errout;
1271
1272
1273 if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED)
1274 goto errout;
1275
1276 break;
1277 }
1278 case RTA_VIA:
1279 {
1280 if (nla_get_via(nla, &cfg->rc_via_alen,
1281 &cfg->rc_via_table, cfg->rc_via))
1282 goto errout;
1283 break;
1284 }
1285 case RTA_MULTIPATH:
1286 {
1287 cfg->rc_mp = nla_data(nla);
1288 cfg->rc_mp_len = nla_len(nla);
1289 break;
1290 }
1291 default:
1292
1293 goto errout;
1294 }
1295 }
1296
1297 err = 0;
1298errout:
1299 return err;
1300}
1301
1302static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1303{
1304 struct mpls_route_config cfg;
1305 int err;
1306
1307 err = rtm_to_route_config(skb, nlh, &cfg);
1308 if (err < 0)
1309 return err;
1310
1311 return mpls_route_del(&cfg);
1312}
1313
1314
1315static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1316{
1317 struct mpls_route_config cfg;
1318 int err;
1319
1320 err = rtm_to_route_config(skb, nlh, &cfg);
1321 if (err < 0)
1322 return err;
1323
1324 return mpls_route_add(&cfg);
1325}
1326
1327static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1328 u32 label, struct mpls_route *rt, int flags)
1329{
1330 struct net_device *dev;
1331 struct nlmsghdr *nlh;
1332 struct rtmsg *rtm;
1333
1334 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1335 if (nlh == NULL)
1336 return -EMSGSIZE;
1337
1338 rtm = nlmsg_data(nlh);
1339 rtm->rtm_family = AF_MPLS;
1340 rtm->rtm_dst_len = 20;
1341 rtm->rtm_src_len = 0;
1342 rtm->rtm_tos = 0;
1343 rtm->rtm_table = RT_TABLE_MAIN;
1344 rtm->rtm_protocol = rt->rt_protocol;
1345 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1346 rtm->rtm_type = RTN_UNICAST;
1347 rtm->rtm_flags = 0;
1348
1349 if (nla_put_labels(skb, RTA_DST, 1, &label))
1350 goto nla_put_failure;
1351 if (rt->rt_nhn == 1) {
1352 const struct mpls_nh *nh = rt->rt_nh;
1353
1354 if (nh->nh_labels &&
1355 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
1356 nh->nh_label))
1357 goto nla_put_failure;
1358 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1359 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
1360 nh->nh_via_alen))
1361 goto nla_put_failure;
1362 dev = rtnl_dereference(nh->nh_dev);
1363 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
1364 goto nla_put_failure;
1365 if (nh->nh_flags & RTNH_F_LINKDOWN)
1366 rtm->rtm_flags |= RTNH_F_LINKDOWN;
1367 if (nh->nh_flags & RTNH_F_DEAD)
1368 rtm->rtm_flags |= RTNH_F_DEAD;
1369 } else {
1370 struct rtnexthop *rtnh;
1371 struct nlattr *mp;
1372 int dead = 0;
1373 int linkdown = 0;
1374
1375 mp = nla_nest_start(skb, RTA_MULTIPATH);
1376 if (!mp)
1377 goto nla_put_failure;
1378
1379 for_nexthops(rt) {
1380 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
1381 if (!rtnh)
1382 goto nla_put_failure;
1383
1384 dev = rtnl_dereference(nh->nh_dev);
1385 if (dev)
1386 rtnh->rtnh_ifindex = dev->ifindex;
1387 if (nh->nh_flags & RTNH_F_LINKDOWN) {
1388 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
1389 linkdown++;
1390 }
1391 if (nh->nh_flags & RTNH_F_DEAD) {
1392 rtnh->rtnh_flags |= RTNH_F_DEAD;
1393 dead++;
1394 }
1395
1396 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
1397 nh->nh_labels,
1398 nh->nh_label))
1399 goto nla_put_failure;
1400 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1401 nla_put_via(skb, nh->nh_via_table,
1402 mpls_nh_via(rt, nh),
1403 nh->nh_via_alen))
1404 goto nla_put_failure;
1405
1406
1407 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
1408 } endfor_nexthops(rt);
1409
1410 if (linkdown == rt->rt_nhn)
1411 rtm->rtm_flags |= RTNH_F_LINKDOWN;
1412 if (dead == rt->rt_nhn)
1413 rtm->rtm_flags |= RTNH_F_DEAD;
1414
1415 nla_nest_end(skb, mp);
1416 }
1417
1418 nlmsg_end(skb, nlh);
1419 return 0;
1420
1421nla_put_failure:
1422 nlmsg_cancel(skb, nlh);
1423 return -EMSGSIZE;
1424}
1425
1426static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
1427{
1428 struct net *net = sock_net(skb->sk);
1429 struct mpls_route __rcu **platform_label;
1430 size_t platform_labels;
1431 unsigned int index;
1432
1433 ASSERT_RTNL();
1434
1435 index = cb->args[0];
1436 if (index < MPLS_LABEL_FIRST_UNRESERVED)
1437 index = MPLS_LABEL_FIRST_UNRESERVED;
1438
1439 platform_label = rtnl_dereference(net->mpls.platform_label);
1440 platform_labels = net->mpls.platform_labels;
1441 for (; index < platform_labels; index++) {
1442 struct mpls_route *rt;
1443 rt = rtnl_dereference(platform_label[index]);
1444 if (!rt)
1445 continue;
1446
1447 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
1448 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1449 index, rt, NLM_F_MULTI) < 0)
1450 break;
1451 }
1452 cb->args[0] = index;
1453
1454 return skb->len;
1455}
1456
1457static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
1458{
1459 size_t payload =
1460 NLMSG_ALIGN(sizeof(struct rtmsg))
1461 + nla_total_size(4);
1462
1463 if (rt->rt_nhn == 1) {
1464 struct mpls_nh *nh = rt->rt_nh;
1465
1466 if (nh->nh_dev)
1467 payload += nla_total_size(4);
1468 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
1469 payload += nla_total_size(2 + nh->nh_via_alen);
1470 if (nh->nh_labels)
1471 payload += nla_total_size(nh->nh_labels * 4);
1472 } else {
1473
1474 size_t nhsize = 0;
1475
1476 for_nexthops(rt) {
1477 nhsize += nla_total_size(sizeof(struct rtnexthop));
1478
1479 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
1480 nhsize += nla_total_size(2 + nh->nh_via_alen);
1481 if (nh->nh_labels)
1482 nhsize += nla_total_size(nh->nh_labels * 4);
1483 } endfor_nexthops(rt);
1484
1485 payload += nla_total_size(nhsize);
1486 }
1487
1488 return payload;
1489}
1490
1491static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
1492 struct nlmsghdr *nlh, struct net *net, u32 portid,
1493 unsigned int nlm_flags)
1494{
1495 struct sk_buff *skb;
1496 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1497 int err = -ENOBUFS;
1498
1499 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
1500 if (skb == NULL)
1501 goto errout;
1502
1503 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
1504 if (err < 0) {
1505
1506 WARN_ON(err == -EMSGSIZE);
1507 kfree_skb(skb);
1508 goto errout;
1509 }
1510 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
1511
1512 return;
1513errout:
1514 if (err < 0)
1515 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
1516}
1517
1518static int resize_platform_label_table(struct net *net, size_t limit)
1519{
1520 size_t size = sizeof(struct mpls_route *) * limit;
1521 size_t old_limit;
1522 size_t cp_size;
1523 struct mpls_route __rcu **labels = NULL, **old;
1524 struct mpls_route *rt0 = NULL, *rt2 = NULL;
1525 unsigned index;
1526
1527 if (size) {
1528 labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
1529 if (!labels)
1530 labels = vzalloc(size);
1531
1532 if (!labels)
1533 goto nolabels;
1534 }
1535
1536
1537 if (limit > MPLS_LABEL_IPV4NULL) {
1538 struct net_device *lo = net->loopback_dev;
1539 rt0 = mpls_rt_alloc(1, lo->addr_len);
1540 if (!rt0)
1541 goto nort0;
1542 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
1543 rt0->rt_protocol = RTPROT_KERNEL;
1544 rt0->rt_payload_type = MPT_IPV4;
1545 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
1546 rt0->rt_nh->nh_via_alen = lo->addr_len;
1547 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
1548 lo->addr_len);
1549 }
1550 if (limit > MPLS_LABEL_IPV6NULL) {
1551 struct net_device *lo = net->loopback_dev;
1552 rt2 = mpls_rt_alloc(1, lo->addr_len);
1553 if (!rt2)
1554 goto nort2;
1555 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
1556 rt2->rt_protocol = RTPROT_KERNEL;
1557 rt2->rt_payload_type = MPT_IPV6;
1558 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
1559 rt2->rt_nh->nh_via_alen = lo->addr_len;
1560 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
1561 lo->addr_len);
1562 }
1563
1564 rtnl_lock();
1565
1566 old = rtnl_dereference(net->mpls.platform_label);
1567 old_limit = net->mpls.platform_labels;
1568
1569
1570 for (index = limit; index < old_limit; index++)
1571 mpls_route_update(net, index, NULL, NULL);
1572
1573
1574 cp_size = size;
1575 if (old_limit < limit)
1576 cp_size = old_limit * sizeof(struct mpls_route *);
1577
1578 memcpy(labels, old, cp_size);
1579
1580
1581 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
1582 (limit > MPLS_LABEL_IPV6NULL)) {
1583 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
1584 rt2 = NULL;
1585 }
1586
1587 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
1588 (limit > MPLS_LABEL_IPV4NULL)) {
1589 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
1590 rt0 = NULL;
1591 }
1592
1593
1594 net->mpls.platform_labels = limit;
1595 rcu_assign_pointer(net->mpls.platform_label, labels);
1596
1597 rtnl_unlock();
1598
1599 mpls_rt_free(rt2);
1600 mpls_rt_free(rt0);
1601
1602 if (old) {
1603 synchronize_rcu();
1604 kvfree(old);
1605 }
1606 return 0;
1607
1608nort2:
1609 mpls_rt_free(rt0);
1610nort0:
1611 kvfree(labels);
1612nolabels:
1613 return -ENOMEM;
1614}
1615
1616static int mpls_platform_labels(struct ctl_table *table, int write,
1617 void __user *buffer, size_t *lenp, loff_t *ppos)
1618{
1619 struct net *net = table->data;
1620 int platform_labels = net->mpls.platform_labels;
1621 int ret;
1622 struct ctl_table tmp = {
1623 .procname = table->procname,
1624 .data = &platform_labels,
1625 .maxlen = sizeof(int),
1626 .mode = table->mode,
1627 .extra1 = &zero,
1628 .extra2 = &label_limit,
1629 };
1630
1631 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1632
1633 if (write && ret == 0)
1634 ret = resize_platform_label_table(net, platform_labels);
1635
1636 return ret;
1637}
1638
1639static const struct ctl_table mpls_table[] = {
1640 {
1641 .procname = "platform_labels",
1642 .data = NULL,
1643 .maxlen = sizeof(int),
1644 .mode = 0644,
1645 .proc_handler = mpls_platform_labels,
1646 },
1647 { }
1648};
1649
1650static int mpls_net_init(struct net *net)
1651{
1652 struct ctl_table *table;
1653
1654 net->mpls.platform_labels = 0;
1655 net->mpls.platform_label = NULL;
1656
1657 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
1658 if (table == NULL)
1659 return -ENOMEM;
1660
1661 table[0].data = net;
1662 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
1663 if (net->mpls.ctl == NULL) {
1664 kfree(table);
1665 return -ENOMEM;
1666 }
1667
1668 return 0;
1669}
1670
1671static void mpls_net_exit(struct net *net)
1672{
1673 struct mpls_route __rcu **platform_label;
1674 size_t platform_labels;
1675 struct ctl_table *table;
1676 unsigned int index;
1677
1678 table = net->mpls.ctl->ctl_table_arg;
1679 unregister_net_sysctl_table(net->mpls.ctl);
1680 kfree(table);
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691 rtnl_lock();
1692 platform_label = rtnl_dereference(net->mpls.platform_label);
1693 platform_labels = net->mpls.platform_labels;
1694 for (index = 0; index < platform_labels; index++) {
1695 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1696 RCU_INIT_POINTER(platform_label[index], NULL);
1697 mpls_rt_free(rt);
1698 }
1699 rtnl_unlock();
1700
1701 kvfree(platform_label);
1702}
1703
1704static struct pernet_operations mpls_net_ops = {
1705 .init = mpls_net_init,
1706 .exit = mpls_net_exit,
1707};
1708
1709static int __init mpls_init(void)
1710{
1711 int err;
1712
1713 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
1714
1715 err = register_pernet_subsys(&mpls_net_ops);
1716 if (err)
1717 goto out;
1718
1719 err = register_netdevice_notifier(&mpls_dev_notifier);
1720 if (err)
1721 goto out_unregister_pernet;
1722
1723 dev_add_pack(&mpls_packet_type);
1724
1725 rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL);
1726 rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL);
1727 rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL);
1728 err = 0;
1729out:
1730 return err;
1731
1732out_unregister_pernet:
1733 unregister_pernet_subsys(&mpls_net_ops);
1734 goto out;
1735}
1736module_init(mpls_init);
1737
1738static void __exit mpls_exit(void)
1739{
1740 rtnl_unregister_all(PF_MPLS);
1741 dev_remove_pack(&mpls_packet_type);
1742 unregister_netdevice_notifier(&mpls_dev_notifier);
1743 unregister_pernet_subsys(&mpls_net_ops);
1744}
1745module_exit(mpls_exit);
1746
1747MODULE_DESCRIPTION("MultiProtocol Label Switching");
1748MODULE_LICENSE("GPL v2");
1749MODULE_ALIAS_NETPROTO(PF_MPLS);
1750
