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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/* Maximum number of labels to look ahead at when selecting a path of
26 * a multipath route
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 /* The size of the layer 2.5 labels to be added for this route */
79 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
80}
81
82unsigned int mpls_dev_mtu(const struct net_device *dev)
83{
84 /* The amount of data the layer 2 frame can hold */
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_network_seglen(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 /* Read and decode the current label */
116 hdr = mpls_hdr(skb) + label_index;
117 dec = mpls_entry_decode(hdr);
118
119 /* RFC6790 - reserved labels MUST NOT be used as keys
120 * for the load-balancing function
121 */
122 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
123 hash = jhash_1word(dec.label, hash);
124
125 /* The entropy label follows the entropy label
126 * indicator, so this means that the entropy
127 * label was just added to the hash - no need to
128 * go any deeper either in the label stack or in the
129 * payload
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 /* No need to look further into packet if there's only
175 * one path
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 /* The IPv4 code below accesses through the IPv4 header
206 * checksum, which is 12 bytes into the packet.
207 * The IPv6 code below accesses through the IPv6 hop limit
208 * which is 8 bytes into the packet.
209 *
210 * For all supported cases there should always be at least 12
211 * bytes of packet data present. The IPv4 header is 20 bytes
212 * without options and the IPv6 header is always 40 bytes
213 * long.
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 /* Careful this entire function runs inside of an rcu critical section */
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 /* Read and decode the label */
278 hdr = mpls_hdr(skb);
279 dec = mpls_entry_decode(hdr);
280
281 /* Pop the label */
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 /* Find the output device */
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 /* Verify ttl is valid */
306 if (dec.ttl <= 1)
307 goto drop;
308 dec.ttl -= 1;
309
310 /* Verify the destination can hold the packet */
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 /* Ensure there is enough space for the headers in the skb */
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 /* Penultimate hop popping */
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 /* Push the new labels */
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 /* If via wasn't specified then send out using device address */
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 /* Ignore reserved labels for now */
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 /* If we removed a route free it now */
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 /* The caller is holding rtnl anyways, so release the dev reference */
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 /* Ensure this is a supported device */
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 /* Ensure only a supported number of labels are present */
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 /* leftover implies invalid nexthop configuration, discard it */
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 /* neither weighted multipath nor any flags
724 * are supported
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 /* If a label was not specified during insert pick one */
770 if ((index == LABEL_NOT_SPECIFIED) &&
771 (cfg->rc_nlflags & NLM_F_CREATE)) {
772 index = find_free_label(net);
773 }
774
775 /* Reserved labels may not be set */
776 if (index < MPLS_LABEL_FIRST_UNRESERVED)
777 goto errout;
778
779 /* The full 20 bit range may not be supported. */
780 if (index >= net->mpls.platform_labels)
781 goto errout;
782
783 /* Append makes no sense with mpls */
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 /* Reserved labels may not be removed */
842 if (index < MPLS_LABEL_FIRST_UNRESERVED)
843 goto errout;
844
845 /* The full 20 bit range may not be supported */
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 /* Table data contains only offsets relative to the base of
882 * the mdev at this point, so make them absolute.
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 /* fall through */
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
966 return;
967}
968
969static void mpls_ifup(struct net_device *dev, unsigned int nh_flags)
970{
971 struct mpls_route __rcu **platform_label;
972 struct net *net = dev_net(dev);
973 unsigned index;
974 int alive;
975
976 platform_label = rtnl_dereference(net->mpls.platform_label);
977 for (index = 0; index < net->mpls.platform_labels; index++) {
978 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
979
980 if (!rt)
981 continue;
982
983 alive = 0;
984 change_nexthops(rt) {
985 struct net_device *nh_dev =
986 rtnl_dereference(nh->nh_dev);
987
988 if (!(nh->nh_flags & nh_flags)) {
989 alive++;
990 continue;
991 }
992 if (nh_dev != dev)
993 continue;
994 alive++;
995 nh->nh_flags &= ~nh_flags;
996 } endfor_nexthops(rt);
997
998 ACCESS_ONCE(rt->rt_nhn_alive) = alive;
999 }
1000
1001 return;
1002}
1003
1004static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1005 void *ptr)
1006{
1007 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1008 struct mpls_dev *mdev;
1009 unsigned int flags;
1010
1011 if (event == NETDEV_REGISTER) {
1012 /* For now just support ethernet devices */
1013 if ((dev->type == ARPHRD_ETHER) ||
1014 (dev->type == ARPHRD_LOOPBACK)) {
1015 mdev = mpls_add_dev(dev);
1016 if (IS_ERR(mdev))
1017 return notifier_from_errno(PTR_ERR(mdev));
1018 }
1019 return NOTIFY_OK;
1020 }
1021
1022 mdev = mpls_dev_get(dev);
1023 if (!mdev)
1024 return NOTIFY_OK;
1025
1026 switch (event) {
1027 case NETDEV_DOWN:
1028 mpls_ifdown(dev, event);
1029 break;
1030 case NETDEV_UP:
1031 flags = dev_get_flags(dev);
1032 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1033 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1034 else
1035 mpls_ifup(dev, RTNH_F_DEAD);
1036 break;
1037 case NETDEV_CHANGE:
1038 flags = dev_get_flags(dev);
1039 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1040 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1041 else
1042 mpls_ifdown(dev, event);
1043 break;
1044 case NETDEV_UNREGISTER:
1045 mpls_ifdown(dev, event);
1046 mdev = mpls_dev_get(dev);
1047 if (mdev) {
1048 mpls_dev_sysctl_unregister(mdev);
1049 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1050 kfree_rcu(mdev, rcu);
1051 }
1052 break;
1053 case NETDEV_CHANGENAME:
1054 mdev = mpls_dev_get(dev);
1055 if (mdev) {
1056 int err;
1057
1058 mpls_dev_sysctl_unregister(mdev);
1059 err = mpls_dev_sysctl_register(dev, mdev);
1060 if (err)
1061 return notifier_from_errno(err);
1062 }
1063 break;
1064 }
1065 return NOTIFY_OK;
1066}
1067
1068static struct notifier_block mpls_dev_notifier = {
1069 .notifier_call = mpls_dev_notify,
1070};
1071
1072static int nla_put_via(struct sk_buff *skb,
1073 u8 table, const void *addr, int alen)
1074{
1075 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1076 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1077 };
1078 struct nlattr *nla;
1079 struct rtvia *via;
1080 int family = AF_UNSPEC;
1081
1082 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1083 if (!nla)
1084 return -EMSGSIZE;
1085
1086 if (table <= NEIGH_NR_TABLES)
1087 family = table_to_family[table];
1088
1089 via = nla_data(nla);
1090 via->rtvia_family = family;
1091 memcpy(via->rtvia_addr, addr, alen);
1092 return 0;
1093}
1094
1095int nla_put_labels(struct sk_buff *skb, int attrtype,
1096 u8 labels, const u32 label[])
1097{
1098 struct nlattr *nla;
1099 struct mpls_shim_hdr *nla_label;
1100 bool bos;
1101 int i;
1102 nla = nla_reserve(skb, attrtype, labels*4);
1103 if (!nla)
1104 return -EMSGSIZE;
1105
1106 nla_label = nla_data(nla);
1107 bos = true;
1108 for (i = labels - 1; i >= 0; i--) {
1109 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1110 bos = false;
1111 }
1112
1113 return 0;
1114}
1115EXPORT_SYMBOL_GPL(nla_put_labels);
1116
1117int nla_get_labels(const struct nlattr *nla,
1118 u32 max_labels, u8 *labels, u32 label[])
1119{
1120 unsigned len = nla_len(nla);
1121 unsigned nla_labels;
1122 struct mpls_shim_hdr *nla_label;
1123 bool bos;
1124 int i;
1125
1126 /* len needs to be an even multiple of 4 (the label size) */
1127 if (len & 3)
1128 return -EINVAL;
1129
1130 /* Limit the number of new labels allowed */
1131 nla_labels = len/4;
1132 if (nla_labels > max_labels)
1133 return -EINVAL;
1134
1135 nla_label = nla_data(nla);
1136 bos = true;
1137 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1138 struct mpls_entry_decoded dec;
1139 dec = mpls_entry_decode(nla_label + i);
1140
1141 /* Ensure the bottom of stack flag is properly set
1142 * and ttl and tc are both clear.
1143 */
1144 if ((dec.bos != bos) || dec.ttl || dec.tc)
1145 return -EINVAL;
1146
1147 switch (dec.label) {
1148 case MPLS_LABEL_IMPLNULL:
1149 /* RFC3032: This is a label that an LSR may
1150 * assign and distribute, but which never
1151 * actually appears in the encapsulation.
1152 */
1153 return -EINVAL;
1154 }
1155
1156 label[i] = dec.label;
1157 }
1158 *labels = nla_labels;
1159 return 0;
1160}
1161EXPORT_SYMBOL_GPL(nla_get_labels);
1162
1163int nla_get_via(const struct nlattr *nla, u8 *via_alen,
1164 u8 *via_table, u8 via_addr[])
1165{
1166 struct rtvia *via = nla_data(nla);
1167 int err = -EINVAL;
1168 int alen;
1169
1170 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr))
1171 goto errout;
1172 alen = nla_len(nla) -
1173 offsetof(struct rtvia, rtvia_addr);
1174 if (alen > MAX_VIA_ALEN)
1175 goto errout;
1176
1177 /* Validate the address family */
1178 switch (via->rtvia_family) {
1179 case AF_PACKET:
1180 *via_table = NEIGH_LINK_TABLE;
1181 break;
1182 case AF_INET:
1183 *via_table = NEIGH_ARP_TABLE;
1184 if (alen != 4)
1185 goto errout;
1186 break;
1187 case AF_INET6:
1188 *via_table = NEIGH_ND_TABLE;
1189 if (alen != 16)
1190 goto errout;
1191 break;
1192 default:
1193 /* Unsupported address family */
1194 goto errout;
1195 }
1196
1197 memcpy(via_addr, via->rtvia_addr, alen);
1198 *via_alen = alen;
1199 err = 0;
1200
1201errout:
1202 return err;
1203}
1204
1205static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1206 struct mpls_route_config *cfg)
1207{
1208 struct rtmsg *rtm;
1209 struct nlattr *tb[RTA_MAX+1];
1210 int index;
1211 int err;
1212
1213 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy);
1214 if (err < 0)
1215 goto errout;
1216
1217 err = -EINVAL;
1218 rtm = nlmsg_data(nlh);
1219 memset(cfg, 0, sizeof(*cfg));
1220
1221 if (rtm->rtm_family != AF_MPLS)
1222 goto errout;
1223 if (rtm->rtm_dst_len != 20)
1224 goto errout;
1225 if (rtm->rtm_src_len != 0)
1226 goto errout;
1227 if (rtm->rtm_tos != 0)
1228 goto errout;
1229 if (rtm->rtm_table != RT_TABLE_MAIN)
1230 goto errout;
1231 /* Any value is acceptable for rtm_protocol */
1232
1233 /* As mpls uses destination specific addresses
1234 * (or source specific address in the case of multicast)
1235 * all addresses have universal scope.
1236 */
1237 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE)
1238 goto errout;
1239 if (rtm->rtm_type != RTN_UNICAST)
1240 goto errout;
1241 if (rtm->rtm_flags != 0)
1242 goto errout;
1243
1244 cfg->rc_label = LABEL_NOT_SPECIFIED;
1245 cfg->rc_protocol = rtm->rtm_protocol;
1246 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1247 cfg->rc_nlflags = nlh->nlmsg_flags;
1248 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1249 cfg->rc_nlinfo.nlh = nlh;
1250 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1251
1252 for (index = 0; index <= RTA_MAX; index++) {
1253 struct nlattr *nla = tb[index];
1254 if (!nla)
1255 continue;
1256
1257 switch(index) {
1258 case RTA_OIF:
1259 cfg->rc_ifindex = nla_get_u32(nla);
1260 break;
1261 case RTA_NEWDST:
1262 if (nla_get_labels(nla, MAX_NEW_LABELS,
1263 &cfg->rc_output_labels,
1264 cfg->rc_output_label))
1265 goto errout;
1266 break;
1267 case RTA_DST:
1268 {
1269 u8 label_count;
1270 if (nla_get_labels(nla, 1, &label_count,
1271 &cfg->rc_label))
1272 goto errout;
1273
1274 /* Reserved labels may not be set */
1275 if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED)
1276 goto errout;
1277
1278 break;
1279 }
1280 case RTA_VIA:
1281 {
1282 if (nla_get_via(nla, &cfg->rc_via_alen,
1283 &cfg->rc_via_table, cfg->rc_via))
1284 goto errout;
1285 break;
1286 }
1287 case RTA_MULTIPATH:
1288 {
1289 cfg->rc_mp = nla_data(nla);
1290 cfg->rc_mp_len = nla_len(nla);
1291 break;
1292 }
1293 default:
1294 /* Unsupported attribute */
1295 goto errout;
1296 }
1297 }
1298
1299 err = 0;
1300errout:
1301 return err;
1302}
1303
1304static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1305{
1306 struct mpls_route_config cfg;
1307 int err;
1308
1309 err = rtm_to_route_config(skb, nlh, &cfg);
1310 if (err < 0)
1311 return err;
1312
1313 return mpls_route_del(&cfg);
1314}
1315
1316
1317static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1318{
1319 struct mpls_route_config cfg;
1320 int err;
1321
1322 err = rtm_to_route_config(skb, nlh, &cfg);
1323 if (err < 0)
1324 return err;
1325
1326 return mpls_route_add(&cfg);
1327}
1328
1329static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1330 u32 label, struct mpls_route *rt, int flags)
1331{
1332 struct net_device *dev;
1333 struct nlmsghdr *nlh;
1334 struct rtmsg *rtm;
1335
1336 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1337 if (nlh == NULL)
1338 return -EMSGSIZE;
1339
1340 rtm = nlmsg_data(nlh);
1341 rtm->rtm_family = AF_MPLS;
1342 rtm->rtm_dst_len = 20;
1343 rtm->rtm_src_len = 0;
1344 rtm->rtm_tos = 0;
1345 rtm->rtm_table = RT_TABLE_MAIN;
1346 rtm->rtm_protocol = rt->rt_protocol;
1347 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1348 rtm->rtm_type = RTN_UNICAST;
1349 rtm->rtm_flags = 0;
1350
1351 if (nla_put_labels(skb, RTA_DST, 1, &label))
1352 goto nla_put_failure;
1353 if (rt->rt_nhn == 1) {
1354 const struct mpls_nh *nh = rt->rt_nh;
1355
1356 if (nh->nh_labels &&
1357 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
1358 nh->nh_label))
1359 goto nla_put_failure;
1360 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1361 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
1362 nh->nh_via_alen))
1363 goto nla_put_failure;
1364 dev = rtnl_dereference(nh->nh_dev);
1365 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
1366 goto nla_put_failure;
1367 if (nh->nh_flags & RTNH_F_LINKDOWN)
1368 rtm->rtm_flags |= RTNH_F_LINKDOWN;
1369 if (nh->nh_flags & RTNH_F_DEAD)
1370 rtm->rtm_flags |= RTNH_F_DEAD;
1371 } else {
1372 struct rtnexthop *rtnh;
1373 struct nlattr *mp;
1374 int dead = 0;
1375 int linkdown = 0;
1376
1377 mp = nla_nest_start(skb, RTA_MULTIPATH);
1378 if (!mp)
1379 goto nla_put_failure;
1380
1381 for_nexthops(rt) {
1382 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
1383 if (!rtnh)
1384 goto nla_put_failure;
1385
1386 dev = rtnl_dereference(nh->nh_dev);
1387 if (dev)
1388 rtnh->rtnh_ifindex = dev->ifindex;
1389 if (nh->nh_flags & RTNH_F_LINKDOWN) {
1390 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
1391 linkdown++;
1392 }
1393 if (nh->nh_flags & RTNH_F_DEAD) {
1394 rtnh->rtnh_flags |= RTNH_F_DEAD;
1395 dead++;
1396 }
1397
1398 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
1399 nh->nh_labels,
1400 nh->nh_label))
1401 goto nla_put_failure;
1402 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1403 nla_put_via(skb, nh->nh_via_table,
1404 mpls_nh_via(rt, nh),
1405 nh->nh_via_alen))
1406 goto nla_put_failure;
1407
1408 /* length of rtnetlink header + attributes */
1409 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
1410 } endfor_nexthops(rt);
1411
1412 if (linkdown == rt->rt_nhn)
1413 rtm->rtm_flags |= RTNH_F_LINKDOWN;
1414 if (dead == rt->rt_nhn)
1415 rtm->rtm_flags |= RTNH_F_DEAD;
1416
1417 nla_nest_end(skb, mp);
1418 }
1419
1420 nlmsg_end(skb, nlh);
1421 return 0;
1422
1423nla_put_failure:
1424 nlmsg_cancel(skb, nlh);
1425 return -EMSGSIZE;
1426}
1427
1428static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
1429{
1430 struct net *net = sock_net(skb->sk);
1431 struct mpls_route __rcu **platform_label;
1432 size_t platform_labels;
1433 unsigned int index;
1434
1435 ASSERT_RTNL();
1436
1437 index = cb->args[0];
1438 if (index < MPLS_LABEL_FIRST_UNRESERVED)
1439 index = MPLS_LABEL_FIRST_UNRESERVED;
1440
1441 platform_label = rtnl_dereference(net->mpls.platform_label);
1442 platform_labels = net->mpls.platform_labels;
1443 for (; index < platform_labels; index++) {
1444 struct mpls_route *rt;
1445 rt = rtnl_dereference(platform_label[index]);
1446 if (!rt)
1447 continue;
1448
1449 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
1450 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1451 index, rt, NLM_F_MULTI) < 0)
1452 break;
1453 }
1454 cb->args[0] = index;
1455
1456 return skb->len;
1457}
1458
1459static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
1460{
1461 size_t payload =
1462 NLMSG_ALIGN(sizeof(struct rtmsg))
1463 + nla_total_size(4); /* RTA_DST */
1464
1465 if (rt->rt_nhn == 1) {
1466 struct mpls_nh *nh = rt->rt_nh;
1467
1468 if (nh->nh_dev)
1469 payload += nla_total_size(4); /* RTA_OIF */
1470 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
1471 payload += nla_total_size(2 + nh->nh_via_alen);
1472 if (nh->nh_labels) /* RTA_NEWDST */
1473 payload += nla_total_size(nh->nh_labels * 4);
1474 } else {
1475 /* each nexthop is packed in an attribute */
1476 size_t nhsize = 0;
1477
1478 for_nexthops(rt) {
1479 nhsize += nla_total_size(sizeof(struct rtnexthop));
1480 /* RTA_VIA */
1481 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
1482 nhsize += nla_total_size(2 + nh->nh_via_alen);
1483 if (nh->nh_labels)
1484 nhsize += nla_total_size(nh->nh_labels * 4);
1485 } endfor_nexthops(rt);
1486 /* nested attribute */
1487 payload += nla_total_size(nhsize);
1488 }
1489
1490 return payload;
1491}
1492
1493static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
1494 struct nlmsghdr *nlh, struct net *net, u32 portid,
1495 unsigned int nlm_flags)
1496{
1497 struct sk_buff *skb;
1498 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1499 int err = -ENOBUFS;
1500
1501 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
1502 if (skb == NULL)
1503 goto errout;
1504
1505 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
1506 if (err < 0) {
1507 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
1508 WARN_ON(err == -EMSGSIZE);
1509 kfree_skb(skb);
1510 goto errout;
1511 }
1512 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
1513
1514 return;
1515errout:
1516 if (err < 0)
1517 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
1518}
1519
1520static int resize_platform_label_table(struct net *net, size_t limit)
1521{
1522 size_t size = sizeof(struct mpls_route *) * limit;
1523 size_t old_limit;
1524 size_t cp_size;
1525 struct mpls_route __rcu **labels = NULL, **old;
1526 struct mpls_route *rt0 = NULL, *rt2 = NULL;
1527 unsigned index;
1528
1529 if (size) {
1530 labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
1531 if (!labels)
1532 labels = vzalloc(size);
1533
1534 if (!labels)
1535 goto nolabels;
1536 }
1537
1538 /* In case the predefined labels need to be populated */
1539 if (limit > MPLS_LABEL_IPV4NULL) {
1540 struct net_device *lo = net->loopback_dev;
1541 rt0 = mpls_rt_alloc(1, lo->addr_len);
1542 if (!rt0)
1543 goto nort0;
1544 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
1545 rt0->rt_protocol = RTPROT_KERNEL;
1546 rt0->rt_payload_type = MPT_IPV4;
1547 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
1548 rt0->rt_nh->nh_via_alen = lo->addr_len;
1549 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
1550 lo->addr_len);
1551 }
1552 if (limit > MPLS_LABEL_IPV6NULL) {
1553 struct net_device *lo = net->loopback_dev;
1554 rt2 = mpls_rt_alloc(1, lo->addr_len);
1555 if (!rt2)
1556 goto nort2;
1557 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
1558 rt2->rt_protocol = RTPROT_KERNEL;
1559 rt2->rt_payload_type = MPT_IPV6;
1560 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
1561 rt2->rt_nh->nh_via_alen = lo->addr_len;
1562 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
1563 lo->addr_len);
1564 }
1565
1566 rtnl_lock();
1567 /* Remember the original table */
1568 old = rtnl_dereference(net->mpls.platform_label);
1569 old_limit = net->mpls.platform_labels;
1570
1571 /* Free any labels beyond the new table */
1572 for (index = limit; index < old_limit; index++)
1573 mpls_route_update(net, index, NULL, NULL);
1574
1575 /* Copy over the old labels */
1576 cp_size = size;
1577 if (old_limit < limit)
1578 cp_size = old_limit * sizeof(struct mpls_route *);
1579
1580 memcpy(labels, old, cp_size);
1581
1582 /* If needed set the predefined labels */
1583 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
1584 (limit > MPLS_LABEL_IPV6NULL)) {
1585 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
1586 rt2 = NULL;
1587 }
1588
1589 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
1590 (limit > MPLS_LABEL_IPV4NULL)) {
1591 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
1592 rt0 = NULL;
1593 }
1594
1595 /* Update the global pointers */
1596 net->mpls.platform_labels = limit;
1597 rcu_assign_pointer(net->mpls.platform_label, labels);
1598
1599 rtnl_unlock();
1600
1601 mpls_rt_free(rt2);
1602 mpls_rt_free(rt0);
1603
1604 if (old) {
1605 synchronize_rcu();
1606 kvfree(old);
1607 }
1608 return 0;
1609
1610nort2:
1611 mpls_rt_free(rt0);
1612nort0:
1613 kvfree(labels);
1614nolabels:
1615 return -ENOMEM;
1616}
1617
1618static int mpls_platform_labels(struct ctl_table *table, int write,
1619 void __user *buffer, size_t *lenp, loff_t *ppos)
1620{
1621 struct net *net = table->data;
1622 int platform_labels = net->mpls.platform_labels;
1623 int ret;
1624 struct ctl_table tmp = {
1625 .procname = table->procname,
1626 .data = &platform_labels,
1627 .maxlen = sizeof(int),
1628 .mode = table->mode,
1629 .extra1 = &zero,
1630 .extra2 = &label_limit,
1631 };
1632
1633 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1634
1635 if (write && ret == 0)
1636 ret = resize_platform_label_table(net, platform_labels);
1637
1638 return ret;
1639}
1640
1641static const struct ctl_table mpls_table[] = {
1642 {
1643 .procname = "platform_labels",
1644 .data = NULL,
1645 .maxlen = sizeof(int),
1646 .mode = 0644,
1647 .proc_handler = mpls_platform_labels,
1648 },
1649 { }
1650};
1651
1652static int mpls_net_init(struct net *net)
1653{
1654 struct ctl_table *table;
1655
1656 net->mpls.platform_labels = 0;
1657 net->mpls.platform_label = NULL;
1658
1659 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
1660 if (table == NULL)
1661 return -ENOMEM;
1662
1663 table[0].data = net;
1664 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
1665 if (net->mpls.ctl == NULL) {
1666 kfree(table);
1667 return -ENOMEM;
1668 }
1669
1670 return 0;
1671}
1672
1673static void mpls_net_exit(struct net *net)
1674{
1675 struct mpls_route __rcu **platform_label;
1676 size_t platform_labels;
1677 struct ctl_table *table;
1678 unsigned int index;
1679
1680 table = net->mpls.ctl->ctl_table_arg;
1681 unregister_net_sysctl_table(net->mpls.ctl);
1682 kfree(table);
1683
1684 /* An rcu grace period has passed since there was a device in
1685 * the network namespace (and thus the last in flight packet)
1686 * left this network namespace. This is because
1687 * unregister_netdevice_many and netdev_run_todo has completed
1688 * for each network device that was in this network namespace.
1689 *
1690 * As such no additional rcu synchronization is necessary when
1691 * freeing the platform_label table.
1692 */
1693 rtnl_lock();
1694 platform_label = rtnl_dereference(net->mpls.platform_label);
1695 platform_labels = net->mpls.platform_labels;
1696 for (index = 0; index < platform_labels; index++) {
1697 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1698 RCU_INIT_POINTER(platform_label[index], NULL);
1699 mpls_rt_free(rt);
1700 }
1701 rtnl_unlock();
1702
1703 kvfree(platform_label);
1704}
1705
1706static struct pernet_operations mpls_net_ops = {
1707 .init = mpls_net_init,
1708 .exit = mpls_net_exit,
1709};
1710
1711static int __init mpls_init(void)
1712{
1713 int err;
1714
1715 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
1716
1717 err = register_pernet_subsys(&mpls_net_ops);
1718 if (err)
1719 goto out;
1720
1721 err = register_netdevice_notifier(&mpls_dev_notifier);
1722 if (err)
1723 goto out_unregister_pernet;
1724
1725 dev_add_pack(&mpls_packet_type);
1726
1727 rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL);
1728 rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL);
1729 rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL);
1730 err = 0;
1731out:
1732 return err;
1733
1734out_unregister_pernet:
1735 unregister_pernet_subsys(&mpls_net_ops);
1736 goto out;
1737}
1738module_init(mpls_init);
1739
1740static void __exit mpls_exit(void)
1741{
1742 rtnl_unregister_all(PF_MPLS);
1743 dev_remove_pack(&mpls_packet_type);
1744 unregister_netdevice_notifier(&mpls_dev_notifier);
1745 unregister_pernet_subsys(&mpls_net_ops);
1746}
1747module_exit(mpls_exit);
1748
1749MODULE_DESCRIPTION("MultiProtocol Label Switching");
1750MODULE_LICENSE("GPL v2");
1751MODULE_ALIAS_NETPROTO(PF_MPLS);
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/netconf.h>
11#include <linux/nospec.h>
12#include <linux/vmalloc.h>
13#include <linux/percpu.h>
14#include <net/ip.h>
15#include <net/dst.h>
16#include <net/sock.h>
17#include <net/arp.h>
18#include <net/ip_fib.h>
19#include <net/netevent.h>
20#include <net/ip_tunnels.h>
21#include <net/netns/generic.h>
22#if IS_ENABLED(CONFIG_IPV6)
23#include <net/ipv6.h>
24#endif
25#include <net/addrconf.h>
26#include <net/nexthop.h>
27#include "internal.h"
28
29/* max memory we will use for mpls_route */
30#define MAX_MPLS_ROUTE_MEM 4096
31
32/* Maximum number of labels to look ahead at when selecting a path of
33 * a multipath route
34 */
35#define MAX_MP_SELECT_LABELS 4
36
37#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
38
39static int zero = 0;
40static int one = 1;
41static int label_limit = (1 << 20) - 1;
42static int ttl_max = 255;
43
44#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
45static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
46{
47 return sizeof(struct mpls_shim_hdr);
48}
49
50static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
51 .encap_hlen = ipgre_mpls_encap_hlen,
52};
53
54static int ipgre_tunnel_encap_add_mpls_ops(void)
55{
56 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
57}
58
59static void ipgre_tunnel_encap_del_mpls_ops(void)
60{
61 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
62}
63#else
64static int ipgre_tunnel_encap_add_mpls_ops(void)
65{
66 return 0;
67}
68
69static void ipgre_tunnel_encap_del_mpls_ops(void)
70{
71}
72#endif
73
74static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
75 struct nlmsghdr *nlh, struct net *net, u32 portid,
76 unsigned int nlm_flags);
77
78static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
79{
80 struct mpls_route *rt = NULL;
81
82 if (index < net->mpls.platform_labels) {
83 struct mpls_route __rcu **platform_label =
84 rcu_dereference(net->mpls.platform_label);
85 rt = rcu_dereference(platform_label[index]);
86 }
87 return rt;
88}
89
90bool mpls_output_possible(const struct net_device *dev)
91{
92 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
93}
94EXPORT_SYMBOL_GPL(mpls_output_possible);
95
96static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
97{
98 return (u8 *)nh + rt->rt_via_offset;
99}
100
101static const u8 *mpls_nh_via(const struct mpls_route *rt,
102 const struct mpls_nh *nh)
103{
104 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
105}
106
107static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
108{
109 /* The size of the layer 2.5 labels to be added for this route */
110 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
111}
112
113unsigned int mpls_dev_mtu(const struct net_device *dev)
114{
115 /* The amount of data the layer 2 frame can hold */
116 return dev->mtu;
117}
118EXPORT_SYMBOL_GPL(mpls_dev_mtu);
119
120bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
121{
122 if (skb->len <= mtu)
123 return false;
124
125 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
126 return false;
127
128 return true;
129}
130EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
131
132void mpls_stats_inc_outucastpkts(struct net_device *dev,
133 const struct sk_buff *skb)
134{
135 struct mpls_dev *mdev;
136
137 if (skb->protocol == htons(ETH_P_MPLS_UC)) {
138 mdev = mpls_dev_get(dev);
139 if (mdev)
140 MPLS_INC_STATS_LEN(mdev, skb->len,
141 tx_packets,
142 tx_bytes);
143 } else if (skb->protocol == htons(ETH_P_IP)) {
144 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
145#if IS_ENABLED(CONFIG_IPV6)
146 } else if (skb->protocol == htons(ETH_P_IPV6)) {
147 struct inet6_dev *in6dev = __in6_dev_get(dev);
148
149 if (in6dev)
150 IP6_UPD_PO_STATS(dev_net(dev), in6dev,
151 IPSTATS_MIB_OUT, skb->len);
152#endif
153 }
154}
155EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
156
157static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
158{
159 struct mpls_entry_decoded dec;
160 unsigned int mpls_hdr_len = 0;
161 struct mpls_shim_hdr *hdr;
162 bool eli_seen = false;
163 int label_index;
164 u32 hash = 0;
165
166 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
167 label_index++) {
168 mpls_hdr_len += sizeof(*hdr);
169 if (!pskb_may_pull(skb, mpls_hdr_len))
170 break;
171
172 /* Read and decode the current label */
173 hdr = mpls_hdr(skb) + label_index;
174 dec = mpls_entry_decode(hdr);
175
176 /* RFC6790 - reserved labels MUST NOT be used as keys
177 * for the load-balancing function
178 */
179 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
180 hash = jhash_1word(dec.label, hash);
181
182 /* The entropy label follows the entropy label
183 * indicator, so this means that the entropy
184 * label was just added to the hash - no need to
185 * go any deeper either in the label stack or in the
186 * payload
187 */
188 if (eli_seen)
189 break;
190 } else if (dec.label == MPLS_LABEL_ENTROPY) {
191 eli_seen = true;
192 }
193
194 if (!dec.bos)
195 continue;
196
197 /* found bottom label; does skb have room for a header? */
198 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) {
199 const struct iphdr *v4hdr;
200
201 v4hdr = (const struct iphdr *)(hdr + 1);
202 if (v4hdr->version == 4) {
203 hash = jhash_3words(ntohl(v4hdr->saddr),
204 ntohl(v4hdr->daddr),
205 v4hdr->protocol, hash);
206 } else if (v4hdr->version == 6 &&
207 pskb_may_pull(skb, mpls_hdr_len +
208 sizeof(struct ipv6hdr))) {
209 const struct ipv6hdr *v6hdr;
210
211 v6hdr = (const struct ipv6hdr *)(hdr + 1);
212 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
213 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
214 hash = jhash_1word(v6hdr->nexthdr, hash);
215 }
216 }
217
218 break;
219 }
220
221 return hash;
222}
223
224static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
225{
226 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
227}
228
229/* number of alive nexthops (rt->rt_nhn_alive) and the flags for
230 * a next hop (nh->nh_flags) are modified by netdev event handlers.
231 * Since those fields can change at any moment, use READ_ONCE to
232 * access both.
233 */
234static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
235 struct sk_buff *skb)
236{
237 u32 hash = 0;
238 int nh_index = 0;
239 int n = 0;
240 u8 alive;
241
242 /* No need to look further into packet if there's only
243 * one path
244 */
245 if (rt->rt_nhn == 1)
246 return rt->rt_nh;
247
248 alive = READ_ONCE(rt->rt_nhn_alive);
249 if (alive == 0)
250 return NULL;
251
252 hash = mpls_multipath_hash(rt, skb);
253 nh_index = hash % alive;
254 if (alive == rt->rt_nhn)
255 goto out;
256 for_nexthops(rt) {
257 unsigned int nh_flags = READ_ONCE(nh->nh_flags);
258
259 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
260 continue;
261 if (n == nh_index)
262 return nh;
263 n++;
264 } endfor_nexthops(rt);
265
266out:
267 return mpls_get_nexthop(rt, nh_index);
268}
269
270static bool mpls_egress(struct net *net, struct mpls_route *rt,
271 struct sk_buff *skb, struct mpls_entry_decoded dec)
272{
273 enum mpls_payload_type payload_type;
274 bool success = false;
275
276 /* The IPv4 code below accesses through the IPv4 header
277 * checksum, which is 12 bytes into the packet.
278 * The IPv6 code below accesses through the IPv6 hop limit
279 * which is 8 bytes into the packet.
280 *
281 * For all supported cases there should always be at least 12
282 * bytes of packet data present. The IPv4 header is 20 bytes
283 * without options and the IPv6 header is always 40 bytes
284 * long.
285 */
286 if (!pskb_may_pull(skb, 12))
287 return false;
288
289 payload_type = rt->rt_payload_type;
290 if (payload_type == MPT_UNSPEC)
291 payload_type = ip_hdr(skb)->version;
292
293 switch (payload_type) {
294 case MPT_IPV4: {
295 struct iphdr *hdr4 = ip_hdr(skb);
296 u8 new_ttl;
297 skb->protocol = htons(ETH_P_IP);
298
299 /* If propagating TTL, take the decremented TTL from
300 * the incoming MPLS header, otherwise decrement the
301 * TTL, but only if not 0 to avoid underflow.
302 */
303 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
304 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
305 net->mpls.ip_ttl_propagate))
306 new_ttl = dec.ttl;
307 else
308 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0;
309
310 csum_replace2(&hdr4->check,
311 htons(hdr4->ttl << 8),
312 htons(new_ttl << 8));
313 hdr4->ttl = new_ttl;
314 success = true;
315 break;
316 }
317 case MPT_IPV6: {
318 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
319 skb->protocol = htons(ETH_P_IPV6);
320
321 /* If propagating TTL, take the decremented TTL from
322 * the incoming MPLS header, otherwise decrement the
323 * hop limit, but only if not 0 to avoid underflow.
324 */
325 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
326 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
327 net->mpls.ip_ttl_propagate))
328 hdr6->hop_limit = dec.ttl;
329 else if (hdr6->hop_limit)
330 hdr6->hop_limit = hdr6->hop_limit - 1;
331 success = true;
332 break;
333 }
334 case MPT_UNSPEC:
335 /* Should have decided which protocol it is by now */
336 break;
337 }
338
339 return success;
340}
341
342static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
343 struct packet_type *pt, struct net_device *orig_dev)
344{
345 struct net *net = dev_net(dev);
346 struct mpls_shim_hdr *hdr;
347 struct mpls_route *rt;
348 struct mpls_nh *nh;
349 struct mpls_entry_decoded dec;
350 struct net_device *out_dev;
351 struct mpls_dev *out_mdev;
352 struct mpls_dev *mdev;
353 unsigned int hh_len;
354 unsigned int new_header_size;
355 unsigned int mtu;
356 int err;
357
358 /* Careful this entire function runs inside of an rcu critical section */
359
360 mdev = mpls_dev_get(dev);
361 if (!mdev)
362 goto drop;
363
364 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets,
365 rx_bytes);
366
367 if (!mdev->input_enabled) {
368 MPLS_INC_STATS(mdev, rx_dropped);
369 goto drop;
370 }
371
372 if (skb->pkt_type != PACKET_HOST)
373 goto err;
374
375 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
376 goto err;
377
378 if (!pskb_may_pull(skb, sizeof(*hdr)))
379 goto err;
380
381 /* Read and decode the label */
382 hdr = mpls_hdr(skb);
383 dec = mpls_entry_decode(hdr);
384
385 rt = mpls_route_input_rcu(net, dec.label);
386 if (!rt) {
387 MPLS_INC_STATS(mdev, rx_noroute);
388 goto drop;
389 }
390
391 nh = mpls_select_multipath(rt, skb);
392 if (!nh)
393 goto err;
394
395 /* Pop the label */
396 skb_pull(skb, sizeof(*hdr));
397 skb_reset_network_header(skb);
398
399 skb_orphan(skb);
400
401 if (skb_warn_if_lro(skb))
402 goto err;
403
404 skb_forward_csum(skb);
405
406 /* Verify ttl is valid */
407 if (dec.ttl <= 1)
408 goto err;
409 dec.ttl -= 1;
410
411 /* Find the output device */
412 out_dev = rcu_dereference(nh->nh_dev);
413 if (!mpls_output_possible(out_dev))
414 goto tx_err;
415
416 /* Verify the destination can hold the packet */
417 new_header_size = mpls_nh_header_size(nh);
418 mtu = mpls_dev_mtu(out_dev);
419 if (mpls_pkt_too_big(skb, mtu - new_header_size))
420 goto tx_err;
421
422 hh_len = LL_RESERVED_SPACE(out_dev);
423 if (!out_dev->header_ops)
424 hh_len = 0;
425
426 /* Ensure there is enough space for the headers in the skb */
427 if (skb_cow(skb, hh_len + new_header_size))
428 goto tx_err;
429
430 skb->dev = out_dev;
431 skb->protocol = htons(ETH_P_MPLS_UC);
432
433 if (unlikely(!new_header_size && dec.bos)) {
434 /* Penultimate hop popping */
435 if (!mpls_egress(dev_net(out_dev), rt, skb, dec))
436 goto err;
437 } else {
438 bool bos;
439 int i;
440 skb_push(skb, new_header_size);
441 skb_reset_network_header(skb);
442 /* Push the new labels */
443 hdr = mpls_hdr(skb);
444 bos = dec.bos;
445 for (i = nh->nh_labels - 1; i >= 0; i--) {
446 hdr[i] = mpls_entry_encode(nh->nh_label[i],
447 dec.ttl, 0, bos);
448 bos = false;
449 }
450 }
451
452 mpls_stats_inc_outucastpkts(out_dev, skb);
453
454 /* If via wasn't specified then send out using device address */
455 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
456 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
457 out_dev->dev_addr, skb);
458 else
459 err = neigh_xmit(nh->nh_via_table, out_dev,
460 mpls_nh_via(rt, nh), skb);
461 if (err)
462 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
463 __func__, err);
464 return 0;
465
466tx_err:
467 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
468 if (out_mdev)
469 MPLS_INC_STATS(out_mdev, tx_errors);
470 goto drop;
471err:
472 MPLS_INC_STATS(mdev, rx_errors);
473drop:
474 kfree_skb(skb);
475 return NET_RX_DROP;
476}
477
478static struct packet_type mpls_packet_type __read_mostly = {
479 .type = cpu_to_be16(ETH_P_MPLS_UC),
480 .func = mpls_forward,
481};
482
483static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
484 [RTA_DST] = { .type = NLA_U32 },
485 [RTA_OIF] = { .type = NLA_U32 },
486 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
487};
488
489struct mpls_route_config {
490 u32 rc_protocol;
491 u32 rc_ifindex;
492 u8 rc_via_table;
493 u8 rc_via_alen;
494 u8 rc_via[MAX_VIA_ALEN];
495 u32 rc_label;
496 u8 rc_ttl_propagate;
497 u8 rc_output_labels;
498 u32 rc_output_label[MAX_NEW_LABELS];
499 u32 rc_nlflags;
500 enum mpls_payload_type rc_payload_type;
501 struct nl_info rc_nlinfo;
502 struct rtnexthop *rc_mp;
503 int rc_mp_len;
504};
505
506/* all nexthops within a route have the same size based on max
507 * number of labels and max via length for a hop
508 */
509static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
510{
511 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
512 struct mpls_route *rt;
513 size_t size;
514
515 size = sizeof(*rt) + num_nh * nh_size;
516 if (size > MAX_MPLS_ROUTE_MEM)
517 return ERR_PTR(-EINVAL);
518
519 rt = kzalloc(size, GFP_KERNEL);
520 if (!rt)
521 return ERR_PTR(-ENOMEM);
522
523 rt->rt_nhn = num_nh;
524 rt->rt_nhn_alive = num_nh;
525 rt->rt_nh_size = nh_size;
526 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels);
527
528 return rt;
529}
530
531static void mpls_rt_free(struct mpls_route *rt)
532{
533 if (rt)
534 kfree_rcu(rt, rt_rcu);
535}
536
537static void mpls_notify_route(struct net *net, unsigned index,
538 struct mpls_route *old, struct mpls_route *new,
539 const struct nl_info *info)
540{
541 struct nlmsghdr *nlh = info ? info->nlh : NULL;
542 unsigned portid = info ? info->portid : 0;
543 int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
544 struct mpls_route *rt = new ? new : old;
545 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
546 /* Ignore reserved labels for now */
547 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
548 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
549}
550
551static void mpls_route_update(struct net *net, unsigned index,
552 struct mpls_route *new,
553 const struct nl_info *info)
554{
555 struct mpls_route __rcu **platform_label;
556 struct mpls_route *rt;
557
558 ASSERT_RTNL();
559
560 platform_label = rtnl_dereference(net->mpls.platform_label);
561 rt = rtnl_dereference(platform_label[index]);
562 rcu_assign_pointer(platform_label[index], new);
563
564 mpls_notify_route(net, index, rt, new, info);
565
566 /* If we removed a route free it now */
567 mpls_rt_free(rt);
568}
569
570static unsigned find_free_label(struct net *net)
571{
572 struct mpls_route __rcu **platform_label;
573 size_t platform_labels;
574 unsigned index;
575
576 platform_label = rtnl_dereference(net->mpls.platform_label);
577 platform_labels = net->mpls.platform_labels;
578 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
579 index++) {
580 if (!rtnl_dereference(platform_label[index]))
581 return index;
582 }
583 return LABEL_NOT_SPECIFIED;
584}
585
586#if IS_ENABLED(CONFIG_INET)
587static struct net_device *inet_fib_lookup_dev(struct net *net,
588 const void *addr)
589{
590 struct net_device *dev;
591 struct rtable *rt;
592 struct in_addr daddr;
593
594 memcpy(&daddr, addr, sizeof(struct in_addr));
595 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
596 if (IS_ERR(rt))
597 return ERR_CAST(rt);
598
599 dev = rt->dst.dev;
600 dev_hold(dev);
601
602 ip_rt_put(rt);
603
604 return dev;
605}
606#else
607static struct net_device *inet_fib_lookup_dev(struct net *net,
608 const void *addr)
609{
610 return ERR_PTR(-EAFNOSUPPORT);
611}
612#endif
613
614#if IS_ENABLED(CONFIG_IPV6)
615static struct net_device *inet6_fib_lookup_dev(struct net *net,
616 const void *addr)
617{
618 struct net_device *dev;
619 struct dst_entry *dst;
620 struct flowi6 fl6;
621 int err;
622
623 if (!ipv6_stub)
624 return ERR_PTR(-EAFNOSUPPORT);
625
626 memset(&fl6, 0, sizeof(fl6));
627 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
628 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
629 if (err)
630 return ERR_PTR(err);
631
632 dev = dst->dev;
633 dev_hold(dev);
634 dst_release(dst);
635
636 return dev;
637}
638#else
639static struct net_device *inet6_fib_lookup_dev(struct net *net,
640 const void *addr)
641{
642 return ERR_PTR(-EAFNOSUPPORT);
643}
644#endif
645
646static struct net_device *find_outdev(struct net *net,
647 struct mpls_route *rt,
648 struct mpls_nh *nh, int oif)
649{
650 struct net_device *dev = NULL;
651
652 if (!oif) {
653 switch (nh->nh_via_table) {
654 case NEIGH_ARP_TABLE:
655 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
656 break;
657 case NEIGH_ND_TABLE:
658 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
659 break;
660 case NEIGH_LINK_TABLE:
661 break;
662 }
663 } else {
664 dev = dev_get_by_index(net, oif);
665 }
666
667 if (!dev)
668 return ERR_PTR(-ENODEV);
669
670 if (IS_ERR(dev))
671 return dev;
672
673 /* The caller is holding rtnl anyways, so release the dev reference */
674 dev_put(dev);
675
676 return dev;
677}
678
679static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
680 struct mpls_nh *nh, int oif)
681{
682 struct net_device *dev = NULL;
683 int err = -ENODEV;
684
685 dev = find_outdev(net, rt, nh, oif);
686 if (IS_ERR(dev)) {
687 err = PTR_ERR(dev);
688 dev = NULL;
689 goto errout;
690 }
691
692 /* Ensure this is a supported device */
693 err = -EINVAL;
694 if (!mpls_dev_get(dev))
695 goto errout;
696
697 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
698 (dev->addr_len != nh->nh_via_alen))
699 goto errout;
700
701 RCU_INIT_POINTER(nh->nh_dev, dev);
702
703 if (!(dev->flags & IFF_UP)) {
704 nh->nh_flags |= RTNH_F_DEAD;
705 } else {
706 unsigned int flags;
707
708 flags = dev_get_flags(dev);
709 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
710 nh->nh_flags |= RTNH_F_LINKDOWN;
711 }
712
713 return 0;
714
715errout:
716 return err;
717}
718
719static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
720 u8 via_addr[], struct netlink_ext_ack *extack)
721{
722 struct rtvia *via = nla_data(nla);
723 int err = -EINVAL;
724 int alen;
725
726 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
727 NL_SET_ERR_MSG_ATTR(extack, nla,
728 "Invalid attribute length for RTA_VIA");
729 goto errout;
730 }
731 alen = nla_len(nla) -
732 offsetof(struct rtvia, rtvia_addr);
733 if (alen > MAX_VIA_ALEN) {
734 NL_SET_ERR_MSG_ATTR(extack, nla,
735 "Invalid address length for RTA_VIA");
736 goto errout;
737 }
738
739 /* Validate the address family */
740 switch (via->rtvia_family) {
741 case AF_PACKET:
742 *via_table = NEIGH_LINK_TABLE;
743 break;
744 case AF_INET:
745 *via_table = NEIGH_ARP_TABLE;
746 if (alen != 4)
747 goto errout;
748 break;
749 case AF_INET6:
750 *via_table = NEIGH_ND_TABLE;
751 if (alen != 16)
752 goto errout;
753 break;
754 default:
755 /* Unsupported address family */
756 goto errout;
757 }
758
759 memcpy(via_addr, via->rtvia_addr, alen);
760 *via_alen = alen;
761 err = 0;
762
763errout:
764 return err;
765}
766
767static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
768 struct mpls_route *rt)
769{
770 struct net *net = cfg->rc_nlinfo.nl_net;
771 struct mpls_nh *nh = rt->rt_nh;
772 int err;
773 int i;
774
775 if (!nh)
776 return -ENOMEM;
777
778 nh->nh_labels = cfg->rc_output_labels;
779 for (i = 0; i < nh->nh_labels; i++)
780 nh->nh_label[i] = cfg->rc_output_label[i];
781
782 nh->nh_via_table = cfg->rc_via_table;
783 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
784 nh->nh_via_alen = cfg->rc_via_alen;
785
786 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
787 if (err)
788 goto errout;
789
790 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
791 rt->rt_nhn_alive--;
792
793 return 0;
794
795errout:
796 return err;
797}
798
799static int mpls_nh_build(struct net *net, struct mpls_route *rt,
800 struct mpls_nh *nh, int oif, struct nlattr *via,
801 struct nlattr *newdst, u8 max_labels,
802 struct netlink_ext_ack *extack)
803{
804 int err = -ENOMEM;
805
806 if (!nh)
807 goto errout;
808
809 if (newdst) {
810 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
811 nh->nh_label, extack);
812 if (err)
813 goto errout;
814 }
815
816 if (via) {
817 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
818 __mpls_nh_via(rt, nh), extack);
819 if (err)
820 goto errout;
821 } else {
822 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
823 }
824
825 err = mpls_nh_assign_dev(net, rt, nh, oif);
826 if (err)
827 goto errout;
828
829 return 0;
830
831errout:
832 return err;
833}
834
835static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
836 u8 cfg_via_alen, u8 *max_via_alen,
837 u8 *max_labels)
838{
839 int remaining = len;
840 u8 nhs = 0;
841
842 *max_via_alen = 0;
843 *max_labels = 0;
844
845 while (rtnh_ok(rtnh, remaining)) {
846 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
847 int attrlen;
848 u8 n_labels = 0;
849
850 attrlen = rtnh_attrlen(rtnh);
851 nla = nla_find(attrs, attrlen, RTA_VIA);
852 if (nla && nla_len(nla) >=
853 offsetof(struct rtvia, rtvia_addr)) {
854 int via_alen = nla_len(nla) -
855 offsetof(struct rtvia, rtvia_addr);
856
857 if (via_alen <= MAX_VIA_ALEN)
858 *max_via_alen = max_t(u16, *max_via_alen,
859 via_alen);
860 }
861
862 nla = nla_find(attrs, attrlen, RTA_NEWDST);
863 if (nla &&
864 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
865 NULL, NULL) != 0)
866 return 0;
867
868 *max_labels = max_t(u8, *max_labels, n_labels);
869
870 /* number of nexthops is tracked by a u8.
871 * Check for overflow.
872 */
873 if (nhs == 255)
874 return 0;
875 nhs++;
876
877 rtnh = rtnh_next(rtnh, &remaining);
878 }
879
880 /* leftover implies invalid nexthop configuration, discard it */
881 return remaining > 0 ? 0 : nhs;
882}
883
884static int mpls_nh_build_multi(struct mpls_route_config *cfg,
885 struct mpls_route *rt, u8 max_labels,
886 struct netlink_ext_ack *extack)
887{
888 struct rtnexthop *rtnh = cfg->rc_mp;
889 struct nlattr *nla_via, *nla_newdst;
890 int remaining = cfg->rc_mp_len;
891 int err = 0;
892 u8 nhs = 0;
893
894 change_nexthops(rt) {
895 int attrlen;
896
897 nla_via = NULL;
898 nla_newdst = NULL;
899
900 err = -EINVAL;
901 if (!rtnh_ok(rtnh, remaining))
902 goto errout;
903
904 /* neither weighted multipath nor any flags
905 * are supported
906 */
907 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
908 goto errout;
909
910 attrlen = rtnh_attrlen(rtnh);
911 if (attrlen > 0) {
912 struct nlattr *attrs = rtnh_attrs(rtnh);
913
914 nla_via = nla_find(attrs, attrlen, RTA_VIA);
915 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
916 }
917
918 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
919 rtnh->rtnh_ifindex, nla_via, nla_newdst,
920 max_labels, extack);
921 if (err)
922 goto errout;
923
924 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
925 rt->rt_nhn_alive--;
926
927 rtnh = rtnh_next(rtnh, &remaining);
928 nhs++;
929 } endfor_nexthops(rt);
930
931 rt->rt_nhn = nhs;
932
933 return 0;
934
935errout:
936 return err;
937}
938
939static bool mpls_label_ok(struct net *net, unsigned int *index,
940 struct netlink_ext_ack *extack)
941{
942 bool is_ok = true;
943
944 /* Reserved labels may not be set */
945 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
946 NL_SET_ERR_MSG(extack,
947 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
948 is_ok = false;
949 }
950
951 /* The full 20 bit range may not be supported. */
952 if (is_ok && *index >= net->mpls.platform_labels) {
953 NL_SET_ERR_MSG(extack,
954 "Label >= configured maximum in platform_labels");
955 is_ok = false;
956 }
957
958 *index = array_index_nospec(*index, net->mpls.platform_labels);
959 return is_ok;
960}
961
962static int mpls_route_add(struct mpls_route_config *cfg,
963 struct netlink_ext_ack *extack)
964{
965 struct mpls_route __rcu **platform_label;
966 struct net *net = cfg->rc_nlinfo.nl_net;
967 struct mpls_route *rt, *old;
968 int err = -EINVAL;
969 u8 max_via_alen;
970 unsigned index;
971 u8 max_labels;
972 u8 nhs;
973
974 index = cfg->rc_label;
975
976 /* If a label was not specified during insert pick one */
977 if ((index == LABEL_NOT_SPECIFIED) &&
978 (cfg->rc_nlflags & NLM_F_CREATE)) {
979 index = find_free_label(net);
980 }
981
982 if (!mpls_label_ok(net, &index, extack))
983 goto errout;
984
985 /* Append makes no sense with mpls */
986 err = -EOPNOTSUPP;
987 if (cfg->rc_nlflags & NLM_F_APPEND) {
988 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
989 goto errout;
990 }
991
992 err = -EEXIST;
993 platform_label = rtnl_dereference(net->mpls.platform_label);
994 old = rtnl_dereference(platform_label[index]);
995 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
996 goto errout;
997
998 err = -EEXIST;
999 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
1000 goto errout;
1001
1002 err = -ENOENT;
1003 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1004 goto errout;
1005
1006 err = -EINVAL;
1007 if (cfg->rc_mp) {
1008 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1009 cfg->rc_via_alen, &max_via_alen,
1010 &max_labels);
1011 } else {
1012 max_via_alen = cfg->rc_via_alen;
1013 max_labels = cfg->rc_output_labels;
1014 nhs = 1;
1015 }
1016
1017 if (nhs == 0) {
1018 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
1019 goto errout;
1020 }
1021
1022 err = -ENOMEM;
1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1024 if (IS_ERR(rt)) {
1025 err = PTR_ERR(rt);
1026 goto errout;
1027 }
1028
1029 rt->rt_protocol = cfg->rc_protocol;
1030 rt->rt_payload_type = cfg->rc_payload_type;
1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1032
1033 if (cfg->rc_mp)
1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1035 else
1036 err = mpls_nh_build_from_cfg(cfg, rt);
1037 if (err)
1038 goto freert;
1039
1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1041
1042 return 0;
1043
1044freert:
1045 mpls_rt_free(rt);
1046errout:
1047 return err;
1048}
1049
1050static int mpls_route_del(struct mpls_route_config *cfg,
1051 struct netlink_ext_ack *extack)
1052{
1053 struct net *net = cfg->rc_nlinfo.nl_net;
1054 unsigned index;
1055 int err = -EINVAL;
1056
1057 index = cfg->rc_label;
1058
1059 if (!mpls_label_ok(net, &index, extack))
1060 goto errout;
1061
1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1063
1064 err = 0;
1065errout:
1066 return err;
1067}
1068
1069static void mpls_get_stats(struct mpls_dev *mdev,
1070 struct mpls_link_stats *stats)
1071{
1072 struct mpls_pcpu_stats *p;
1073 int i;
1074
1075 memset(stats, 0, sizeof(*stats));
1076
1077 for_each_possible_cpu(i) {
1078 struct mpls_link_stats local;
1079 unsigned int start;
1080
1081 p = per_cpu_ptr(mdev->stats, i);
1082 do {
1083 start = u64_stats_fetch_begin(&p->syncp);
1084 local = p->stats;
1085 } while (u64_stats_fetch_retry(&p->syncp, start));
1086
1087 stats->rx_packets += local.rx_packets;
1088 stats->rx_bytes += local.rx_bytes;
1089 stats->tx_packets += local.tx_packets;
1090 stats->tx_bytes += local.tx_bytes;
1091 stats->rx_errors += local.rx_errors;
1092 stats->tx_errors += local.tx_errors;
1093 stats->rx_dropped += local.rx_dropped;
1094 stats->tx_dropped += local.tx_dropped;
1095 stats->rx_noroute += local.rx_noroute;
1096 }
1097}
1098
1099static int mpls_fill_stats_af(struct sk_buff *skb,
1100 const struct net_device *dev)
1101{
1102 struct mpls_link_stats *stats;
1103 struct mpls_dev *mdev;
1104 struct nlattr *nla;
1105
1106 mdev = mpls_dev_get(dev);
1107 if (!mdev)
1108 return -ENODATA;
1109
1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1111 sizeof(struct mpls_link_stats),
1112 MPLS_STATS_UNSPEC);
1113 if (!nla)
1114 return -EMSGSIZE;
1115
1116 stats = nla_data(nla);
1117 mpls_get_stats(mdev, stats);
1118
1119 return 0;
1120}
1121
1122static size_t mpls_get_stats_af_size(const struct net_device *dev)
1123{
1124 struct mpls_dev *mdev;
1125
1126 mdev = mpls_dev_get(dev);
1127 if (!mdev)
1128 return 0;
1129
1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1131}
1132
1133static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1134 u32 portid, u32 seq, int event,
1135 unsigned int flags, int type)
1136{
1137 struct nlmsghdr *nlh;
1138 struct netconfmsg *ncm;
1139 bool all = false;
1140
1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1142 flags);
1143 if (!nlh)
1144 return -EMSGSIZE;
1145
1146 if (type == NETCONFA_ALL)
1147 all = true;
1148
1149 ncm = nlmsg_data(nlh);
1150 ncm->ncm_family = AF_MPLS;
1151
1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1153 goto nla_put_failure;
1154
1155 if ((all || type == NETCONFA_INPUT) &&
1156 nla_put_s32(skb, NETCONFA_INPUT,
1157 mdev->input_enabled) < 0)
1158 goto nla_put_failure;
1159
1160 nlmsg_end(skb, nlh);
1161 return 0;
1162
1163nla_put_failure:
1164 nlmsg_cancel(skb, nlh);
1165 return -EMSGSIZE;
1166}
1167
1168static int mpls_netconf_msgsize_devconf(int type)
1169{
1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1171 + nla_total_size(4); /* NETCONFA_IFINDEX */
1172 bool all = false;
1173
1174 if (type == NETCONFA_ALL)
1175 all = true;
1176
1177 if (all || type == NETCONFA_INPUT)
1178 size += nla_total_size(4);
1179
1180 return size;
1181}
1182
1183static void mpls_netconf_notify_devconf(struct net *net, int event,
1184 int type, struct mpls_dev *mdev)
1185{
1186 struct sk_buff *skb;
1187 int err = -ENOBUFS;
1188
1189 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1190 if (!skb)
1191 goto errout;
1192
1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1194 if (err < 0) {
1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1196 WARN_ON(err == -EMSGSIZE);
1197 kfree_skb(skb);
1198 goto errout;
1199 }
1200
1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1202 return;
1203errout:
1204 if (err < 0)
1205 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1206}
1207
1208static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1209 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1210};
1211
1212static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1213 struct nlmsghdr *nlh,
1214 struct netlink_ext_ack *extack)
1215{
1216 struct net *net = sock_net(in_skb->sk);
1217 struct nlattr *tb[NETCONFA_MAX + 1];
1218 struct netconfmsg *ncm;
1219 struct net_device *dev;
1220 struct mpls_dev *mdev;
1221 struct sk_buff *skb;
1222 int ifindex;
1223 int err;
1224
1225 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1226 devconf_mpls_policy, NULL);
1227 if (err < 0)
1228 goto errout;
1229
1230 err = -EINVAL;
1231 if (!tb[NETCONFA_IFINDEX])
1232 goto errout;
1233
1234 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1235 dev = __dev_get_by_index(net, ifindex);
1236 if (!dev)
1237 goto errout;
1238
1239 mdev = mpls_dev_get(dev);
1240 if (!mdev)
1241 goto errout;
1242
1243 err = -ENOBUFS;
1244 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1245 if (!skb)
1246 goto errout;
1247
1248 err = mpls_netconf_fill_devconf(skb, mdev,
1249 NETLINK_CB(in_skb).portid,
1250 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1251 NETCONFA_ALL);
1252 if (err < 0) {
1253 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1254 WARN_ON(err == -EMSGSIZE);
1255 kfree_skb(skb);
1256 goto errout;
1257 }
1258 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1259errout:
1260 return err;
1261}
1262
1263static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1264 struct netlink_callback *cb)
1265{
1266 struct net *net = sock_net(skb->sk);
1267 struct hlist_head *head;
1268 struct net_device *dev;
1269 struct mpls_dev *mdev;
1270 int idx, s_idx;
1271 int h, s_h;
1272
1273 s_h = cb->args[0];
1274 s_idx = idx = cb->args[1];
1275
1276 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1277 idx = 0;
1278 head = &net->dev_index_head[h];
1279 rcu_read_lock();
1280 cb->seq = net->dev_base_seq;
1281 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1282 if (idx < s_idx)
1283 goto cont;
1284 mdev = mpls_dev_get(dev);
1285 if (!mdev)
1286 goto cont;
1287 if (mpls_netconf_fill_devconf(skb, mdev,
1288 NETLINK_CB(cb->skb).portid,
1289 cb->nlh->nlmsg_seq,
1290 RTM_NEWNETCONF,
1291 NLM_F_MULTI,
1292 NETCONFA_ALL) < 0) {
1293 rcu_read_unlock();
1294 goto done;
1295 }
1296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1297cont:
1298 idx++;
1299 }
1300 rcu_read_unlock();
1301 }
1302done:
1303 cb->args[0] = h;
1304 cb->args[1] = idx;
1305
1306 return skb->len;
1307}
1308
1309#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1310 (&((struct mpls_dev *)0)->field)
1311
1312static int mpls_conf_proc(struct ctl_table *ctl, int write,
1313 void __user *buffer,
1314 size_t *lenp, loff_t *ppos)
1315{
1316 int oval = *(int *)ctl->data;
1317 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1318
1319 if (write) {
1320 struct mpls_dev *mdev = ctl->extra1;
1321 int i = (int *)ctl->data - (int *)mdev;
1322 struct net *net = ctl->extra2;
1323 int val = *(int *)ctl->data;
1324
1325 if (i == offsetof(struct mpls_dev, input_enabled) &&
1326 val != oval) {
1327 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1328 NETCONFA_INPUT, mdev);
1329 }
1330 }
1331
1332 return ret;
1333}
1334
1335static const struct ctl_table mpls_dev_table[] = {
1336 {
1337 .procname = "input",
1338 .maxlen = sizeof(int),
1339 .mode = 0644,
1340 .proc_handler = mpls_conf_proc,
1341 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1342 },
1343 { }
1344};
1345
1346static int mpls_dev_sysctl_register(struct net_device *dev,
1347 struct mpls_dev *mdev)
1348{
1349 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1350 struct net *net = dev_net(dev);
1351 struct ctl_table *table;
1352 int i;
1353
1354 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1355 if (!table)
1356 goto out;
1357
1358 /* Table data contains only offsets relative to the base of
1359 * the mdev at this point, so make them absolute.
1360 */
1361 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
1362 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1363 table[i].extra1 = mdev;
1364 table[i].extra2 = net;
1365 }
1366
1367 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1368
1369 mdev->sysctl = register_net_sysctl(net, path, table);
1370 if (!mdev->sysctl)
1371 goto free;
1372
1373 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1374 return 0;
1375
1376free:
1377 kfree(table);
1378out:
1379 return -ENOBUFS;
1380}
1381
1382static void mpls_dev_sysctl_unregister(struct net_device *dev,
1383 struct mpls_dev *mdev)
1384{
1385 struct net *net = dev_net(dev);
1386 struct ctl_table *table;
1387
1388 table = mdev->sysctl->ctl_table_arg;
1389 unregister_net_sysctl_table(mdev->sysctl);
1390 kfree(table);
1391
1392 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1393}
1394
1395static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1396{
1397 struct mpls_dev *mdev;
1398 int err = -ENOMEM;
1399 int i;
1400
1401 ASSERT_RTNL();
1402
1403 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1404 if (!mdev)
1405 return ERR_PTR(err);
1406
1407 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1408 if (!mdev->stats)
1409 goto free;
1410
1411 for_each_possible_cpu(i) {
1412 struct mpls_pcpu_stats *mpls_stats;
1413
1414 mpls_stats = per_cpu_ptr(mdev->stats, i);
1415 u64_stats_init(&mpls_stats->syncp);
1416 }
1417
1418 mdev->dev = dev;
1419
1420 err = mpls_dev_sysctl_register(dev, mdev);
1421 if (err)
1422 goto free;
1423
1424 rcu_assign_pointer(dev->mpls_ptr, mdev);
1425
1426 return mdev;
1427
1428free:
1429 free_percpu(mdev->stats);
1430 kfree(mdev);
1431 return ERR_PTR(err);
1432}
1433
1434static void mpls_dev_destroy_rcu(struct rcu_head *head)
1435{
1436 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1437
1438 free_percpu(mdev->stats);
1439 kfree(mdev);
1440}
1441
1442static void mpls_ifdown(struct net_device *dev, int event)
1443{
1444 struct mpls_route __rcu **platform_label;
1445 struct net *net = dev_net(dev);
1446 u8 alive, deleted;
1447 unsigned index;
1448
1449 platform_label = rtnl_dereference(net->mpls.platform_label);
1450 for (index = 0; index < net->mpls.platform_labels; index++) {
1451 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1452
1453 if (!rt)
1454 continue;
1455
1456 alive = 0;
1457 deleted = 0;
1458 change_nexthops(rt) {
1459 unsigned int nh_flags = nh->nh_flags;
1460
1461 if (rtnl_dereference(nh->nh_dev) != dev)
1462 goto next;
1463
1464 switch (event) {
1465 case NETDEV_DOWN:
1466 case NETDEV_UNREGISTER:
1467 nh_flags |= RTNH_F_DEAD;
1468 /* fall through */
1469 case NETDEV_CHANGE:
1470 nh_flags |= RTNH_F_LINKDOWN;
1471 break;
1472 }
1473 if (event == NETDEV_UNREGISTER)
1474 RCU_INIT_POINTER(nh->nh_dev, NULL);
1475
1476 if (nh->nh_flags != nh_flags)
1477 WRITE_ONCE(nh->nh_flags, nh_flags);
1478next:
1479 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1480 alive++;
1481 if (!rtnl_dereference(nh->nh_dev))
1482 deleted++;
1483 } endfor_nexthops(rt);
1484
1485 WRITE_ONCE(rt->rt_nhn_alive, alive);
1486
1487 /* if there are no more nexthops, delete the route */
1488 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
1489 mpls_route_update(net, index, NULL, NULL);
1490 }
1491}
1492
1493static void mpls_ifup(struct net_device *dev, unsigned int flags)
1494{
1495 struct mpls_route __rcu **platform_label;
1496 struct net *net = dev_net(dev);
1497 unsigned index;
1498 u8 alive;
1499
1500 platform_label = rtnl_dereference(net->mpls.platform_label);
1501 for (index = 0; index < net->mpls.platform_labels; index++) {
1502 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1503
1504 if (!rt)
1505 continue;
1506
1507 alive = 0;
1508 change_nexthops(rt) {
1509 unsigned int nh_flags = nh->nh_flags;
1510 struct net_device *nh_dev =
1511 rtnl_dereference(nh->nh_dev);
1512
1513 if (!(nh_flags & flags)) {
1514 alive++;
1515 continue;
1516 }
1517 if (nh_dev != dev)
1518 continue;
1519 alive++;
1520 nh_flags &= ~flags;
1521 WRITE_ONCE(nh->nh_flags, nh_flags);
1522 } endfor_nexthops(rt);
1523
1524 WRITE_ONCE(rt->rt_nhn_alive, alive);
1525 }
1526}
1527
1528static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1529 void *ptr)
1530{
1531 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1532 struct mpls_dev *mdev;
1533 unsigned int flags;
1534
1535 if (event == NETDEV_REGISTER) {
1536 /* For now just support Ethernet, IPGRE, SIT and IPIP devices */
1537 if (dev->type == ARPHRD_ETHER ||
1538 dev->type == ARPHRD_LOOPBACK ||
1539 dev->type == ARPHRD_IPGRE ||
1540 dev->type == ARPHRD_SIT ||
1541 dev->type == ARPHRD_TUNNEL) {
1542 mdev = mpls_add_dev(dev);
1543 if (IS_ERR(mdev))
1544 return notifier_from_errno(PTR_ERR(mdev));
1545 }
1546 return NOTIFY_OK;
1547 }
1548
1549 mdev = mpls_dev_get(dev);
1550 if (!mdev)
1551 return NOTIFY_OK;
1552
1553 switch (event) {
1554 case NETDEV_DOWN:
1555 mpls_ifdown(dev, event);
1556 break;
1557 case NETDEV_UP:
1558 flags = dev_get_flags(dev);
1559 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1560 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1561 else
1562 mpls_ifup(dev, RTNH_F_DEAD);
1563 break;
1564 case NETDEV_CHANGE:
1565 flags = dev_get_flags(dev);
1566 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1567 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1568 else
1569 mpls_ifdown(dev, event);
1570 break;
1571 case NETDEV_UNREGISTER:
1572 mpls_ifdown(dev, event);
1573 mdev = mpls_dev_get(dev);
1574 if (mdev) {
1575 mpls_dev_sysctl_unregister(dev, mdev);
1576 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1577 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1578 }
1579 break;
1580 case NETDEV_CHANGENAME:
1581 mdev = mpls_dev_get(dev);
1582 if (mdev) {
1583 int err;
1584
1585 mpls_dev_sysctl_unregister(dev, mdev);
1586 err = mpls_dev_sysctl_register(dev, mdev);
1587 if (err)
1588 return notifier_from_errno(err);
1589 }
1590 break;
1591 }
1592 return NOTIFY_OK;
1593}
1594
1595static struct notifier_block mpls_dev_notifier = {
1596 .notifier_call = mpls_dev_notify,
1597};
1598
1599static int nla_put_via(struct sk_buff *skb,
1600 u8 table, const void *addr, int alen)
1601{
1602 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1603 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1604 };
1605 struct nlattr *nla;
1606 struct rtvia *via;
1607 int family = AF_UNSPEC;
1608
1609 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1610 if (!nla)
1611 return -EMSGSIZE;
1612
1613 if (table <= NEIGH_NR_TABLES)
1614 family = table_to_family[table];
1615
1616 via = nla_data(nla);
1617 via->rtvia_family = family;
1618 memcpy(via->rtvia_addr, addr, alen);
1619 return 0;
1620}
1621
1622int nla_put_labels(struct sk_buff *skb, int attrtype,
1623 u8 labels, const u32 label[])
1624{
1625 struct nlattr *nla;
1626 struct mpls_shim_hdr *nla_label;
1627 bool bos;
1628 int i;
1629 nla = nla_reserve(skb, attrtype, labels*4);
1630 if (!nla)
1631 return -EMSGSIZE;
1632
1633 nla_label = nla_data(nla);
1634 bos = true;
1635 for (i = labels - 1; i >= 0; i--) {
1636 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1637 bos = false;
1638 }
1639
1640 return 0;
1641}
1642EXPORT_SYMBOL_GPL(nla_put_labels);
1643
1644int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1645 u32 label[], struct netlink_ext_ack *extack)
1646{
1647 unsigned len = nla_len(nla);
1648 struct mpls_shim_hdr *nla_label;
1649 u8 nla_labels;
1650 bool bos;
1651 int i;
1652
1653 /* len needs to be an even multiple of 4 (the label size). Number
1654 * of labels is a u8 so check for overflow.
1655 */
1656 if (len & 3 || len / 4 > 255) {
1657 NL_SET_ERR_MSG_ATTR(extack, nla,
1658 "Invalid length for labels attribute");
1659 return -EINVAL;
1660 }
1661
1662 /* Limit the number of new labels allowed */
1663 nla_labels = len/4;
1664 if (nla_labels > max_labels) {
1665 NL_SET_ERR_MSG(extack, "Too many labels");
1666 return -EINVAL;
1667 }
1668
1669 /* when label == NULL, caller wants number of labels */
1670 if (!label)
1671 goto out;
1672
1673 nla_label = nla_data(nla);
1674 bos = true;
1675 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1676 struct mpls_entry_decoded dec;
1677 dec = mpls_entry_decode(nla_label + i);
1678
1679 /* Ensure the bottom of stack flag is properly set
1680 * and ttl and tc are both clear.
1681 */
1682 if (dec.ttl) {
1683 NL_SET_ERR_MSG_ATTR(extack, nla,
1684 "TTL in label must be 0");
1685 return -EINVAL;
1686 }
1687
1688 if (dec.tc) {
1689 NL_SET_ERR_MSG_ATTR(extack, nla,
1690 "Traffic class in label must be 0");
1691 return -EINVAL;
1692 }
1693
1694 if (dec.bos != bos) {
1695 NL_SET_BAD_ATTR(extack, nla);
1696 if (bos) {
1697 NL_SET_ERR_MSG(extack,
1698 "BOS bit must be set in first label");
1699 } else {
1700 NL_SET_ERR_MSG(extack,
1701 "BOS bit can only be set in first label");
1702 }
1703 return -EINVAL;
1704 }
1705
1706 switch (dec.label) {
1707 case MPLS_LABEL_IMPLNULL:
1708 /* RFC3032: This is a label that an LSR may
1709 * assign and distribute, but which never
1710 * actually appears in the encapsulation.
1711 */
1712 NL_SET_ERR_MSG_ATTR(extack, nla,
1713 "Implicit NULL Label (3) can not be used in encapsulation");
1714 return -EINVAL;
1715 }
1716
1717 label[i] = dec.label;
1718 }
1719out:
1720 *labels = nla_labels;
1721 return 0;
1722}
1723EXPORT_SYMBOL_GPL(nla_get_labels);
1724
1725static int rtm_to_route_config(struct sk_buff *skb,
1726 struct nlmsghdr *nlh,
1727 struct mpls_route_config *cfg,
1728 struct netlink_ext_ack *extack)
1729{
1730 struct rtmsg *rtm;
1731 struct nlattr *tb[RTA_MAX+1];
1732 int index;
1733 int err;
1734
1735 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy,
1736 extack);
1737 if (err < 0)
1738 goto errout;
1739
1740 err = -EINVAL;
1741 rtm = nlmsg_data(nlh);
1742
1743 if (rtm->rtm_family != AF_MPLS) {
1744 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1745 goto errout;
1746 }
1747 if (rtm->rtm_dst_len != 20) {
1748 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1749 goto errout;
1750 }
1751 if (rtm->rtm_src_len != 0) {
1752 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1753 goto errout;
1754 }
1755 if (rtm->rtm_tos != 0) {
1756 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1757 goto errout;
1758 }
1759 if (rtm->rtm_table != RT_TABLE_MAIN) {
1760 NL_SET_ERR_MSG(extack,
1761 "MPLS only supports the main route table");
1762 goto errout;
1763 }
1764 /* Any value is acceptable for rtm_protocol */
1765
1766 /* As mpls uses destination specific addresses
1767 * (or source specific address in the case of multicast)
1768 * all addresses have universal scope.
1769 */
1770 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1771 NL_SET_ERR_MSG(extack,
1772 "Invalid route scope - MPLS only supports UNIVERSE");
1773 goto errout;
1774 }
1775 if (rtm->rtm_type != RTN_UNICAST) {
1776 NL_SET_ERR_MSG(extack,
1777 "Invalid route type - MPLS only supports UNICAST");
1778 goto errout;
1779 }
1780 if (rtm->rtm_flags != 0) {
1781 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1782 goto errout;
1783 }
1784
1785 cfg->rc_label = LABEL_NOT_SPECIFIED;
1786 cfg->rc_protocol = rtm->rtm_protocol;
1787 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1788 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1789 cfg->rc_nlflags = nlh->nlmsg_flags;
1790 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1791 cfg->rc_nlinfo.nlh = nlh;
1792 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1793
1794 for (index = 0; index <= RTA_MAX; index++) {
1795 struct nlattr *nla = tb[index];
1796 if (!nla)
1797 continue;
1798
1799 switch (index) {
1800 case RTA_OIF:
1801 cfg->rc_ifindex = nla_get_u32(nla);
1802 break;
1803 case RTA_NEWDST:
1804 if (nla_get_labels(nla, MAX_NEW_LABELS,
1805 &cfg->rc_output_labels,
1806 cfg->rc_output_label, extack))
1807 goto errout;
1808 break;
1809 case RTA_DST:
1810 {
1811 u8 label_count;
1812 if (nla_get_labels(nla, 1, &label_count,
1813 &cfg->rc_label, extack))
1814 goto errout;
1815
1816 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1817 &cfg->rc_label, extack))
1818 goto errout;
1819 break;
1820 }
1821 case RTA_VIA:
1822 {
1823 if (nla_get_via(nla, &cfg->rc_via_alen,
1824 &cfg->rc_via_table, cfg->rc_via,
1825 extack))
1826 goto errout;
1827 break;
1828 }
1829 case RTA_MULTIPATH:
1830 {
1831 cfg->rc_mp = nla_data(nla);
1832 cfg->rc_mp_len = nla_len(nla);
1833 break;
1834 }
1835 case RTA_TTL_PROPAGATE:
1836 {
1837 u8 ttl_propagate = nla_get_u8(nla);
1838
1839 if (ttl_propagate > 1) {
1840 NL_SET_ERR_MSG_ATTR(extack, nla,
1841 "RTA_TTL_PROPAGATE can only be 0 or 1");
1842 goto errout;
1843 }
1844 cfg->rc_ttl_propagate = ttl_propagate ?
1845 MPLS_TTL_PROP_ENABLED :
1846 MPLS_TTL_PROP_DISABLED;
1847 break;
1848 }
1849 default:
1850 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1851 /* Unsupported attribute */
1852 goto errout;
1853 }
1854 }
1855
1856 err = 0;
1857errout:
1858 return err;
1859}
1860
1861static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1862 struct netlink_ext_ack *extack)
1863{
1864 struct mpls_route_config *cfg;
1865 int err;
1866
1867 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1868 if (!cfg)
1869 return -ENOMEM;
1870
1871 err = rtm_to_route_config(skb, nlh, cfg, extack);
1872 if (err < 0)
1873 goto out;
1874
1875 err = mpls_route_del(cfg, extack);
1876out:
1877 kfree(cfg);
1878
1879 return err;
1880}
1881
1882
1883static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1884 struct netlink_ext_ack *extack)
1885{
1886 struct mpls_route_config *cfg;
1887 int err;
1888
1889 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1890 if (!cfg)
1891 return -ENOMEM;
1892
1893 err = rtm_to_route_config(skb, nlh, cfg, extack);
1894 if (err < 0)
1895 goto out;
1896
1897 err = mpls_route_add(cfg, extack);
1898out:
1899 kfree(cfg);
1900
1901 return err;
1902}
1903
1904static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1905 u32 label, struct mpls_route *rt, int flags)
1906{
1907 struct net_device *dev;
1908 struct nlmsghdr *nlh;
1909 struct rtmsg *rtm;
1910
1911 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1912 if (nlh == NULL)
1913 return -EMSGSIZE;
1914
1915 rtm = nlmsg_data(nlh);
1916 rtm->rtm_family = AF_MPLS;
1917 rtm->rtm_dst_len = 20;
1918 rtm->rtm_src_len = 0;
1919 rtm->rtm_tos = 0;
1920 rtm->rtm_table = RT_TABLE_MAIN;
1921 rtm->rtm_protocol = rt->rt_protocol;
1922 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1923 rtm->rtm_type = RTN_UNICAST;
1924 rtm->rtm_flags = 0;
1925
1926 if (nla_put_labels(skb, RTA_DST, 1, &label))
1927 goto nla_put_failure;
1928
1929 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1930 bool ttl_propagate =
1931 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1932
1933 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
1934 ttl_propagate))
1935 goto nla_put_failure;
1936 }
1937 if (rt->rt_nhn == 1) {
1938 const struct mpls_nh *nh = rt->rt_nh;
1939
1940 if (nh->nh_labels &&
1941 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
1942 nh->nh_label))
1943 goto nla_put_failure;
1944 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1945 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
1946 nh->nh_via_alen))
1947 goto nla_put_failure;
1948 dev = rtnl_dereference(nh->nh_dev);
1949 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
1950 goto nla_put_failure;
1951 if (nh->nh_flags & RTNH_F_LINKDOWN)
1952 rtm->rtm_flags |= RTNH_F_LINKDOWN;
1953 if (nh->nh_flags & RTNH_F_DEAD)
1954 rtm->rtm_flags |= RTNH_F_DEAD;
1955 } else {
1956 struct rtnexthop *rtnh;
1957 struct nlattr *mp;
1958 u8 linkdown = 0;
1959 u8 dead = 0;
1960
1961 mp = nla_nest_start(skb, RTA_MULTIPATH);
1962 if (!mp)
1963 goto nla_put_failure;
1964
1965 for_nexthops(rt) {
1966 dev = rtnl_dereference(nh->nh_dev);
1967 if (!dev)
1968 continue;
1969
1970 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
1971 if (!rtnh)
1972 goto nla_put_failure;
1973
1974 rtnh->rtnh_ifindex = dev->ifindex;
1975 if (nh->nh_flags & RTNH_F_LINKDOWN) {
1976 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
1977 linkdown++;
1978 }
1979 if (nh->nh_flags & RTNH_F_DEAD) {
1980 rtnh->rtnh_flags |= RTNH_F_DEAD;
1981 dead++;
1982 }
1983
1984 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
1985 nh->nh_labels,
1986 nh->nh_label))
1987 goto nla_put_failure;
1988 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
1989 nla_put_via(skb, nh->nh_via_table,
1990 mpls_nh_via(rt, nh),
1991 nh->nh_via_alen))
1992 goto nla_put_failure;
1993
1994 /* length of rtnetlink header + attributes */
1995 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
1996 } endfor_nexthops(rt);
1997
1998 if (linkdown == rt->rt_nhn)
1999 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2000 if (dead == rt->rt_nhn)
2001 rtm->rtm_flags |= RTNH_F_DEAD;
2002
2003 nla_nest_end(skb, mp);
2004 }
2005
2006 nlmsg_end(skb, nlh);
2007 return 0;
2008
2009nla_put_failure:
2010 nlmsg_cancel(skb, nlh);
2011 return -EMSGSIZE;
2012}
2013
2014static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2015{
2016 struct net *net = sock_net(skb->sk);
2017 struct mpls_route __rcu **platform_label;
2018 size_t platform_labels;
2019 unsigned int index;
2020
2021 ASSERT_RTNL();
2022
2023 index = cb->args[0];
2024 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2025 index = MPLS_LABEL_FIRST_UNRESERVED;
2026
2027 platform_label = rtnl_dereference(net->mpls.platform_label);
2028 platform_labels = net->mpls.platform_labels;
2029 for (; index < platform_labels; index++) {
2030 struct mpls_route *rt;
2031 rt = rtnl_dereference(platform_label[index]);
2032 if (!rt)
2033 continue;
2034
2035 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2036 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2037 index, rt, NLM_F_MULTI) < 0)
2038 break;
2039 }
2040 cb->args[0] = index;
2041
2042 return skb->len;
2043}
2044
2045static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2046{
2047 size_t payload =
2048 NLMSG_ALIGN(sizeof(struct rtmsg))
2049 + nla_total_size(4) /* RTA_DST */
2050 + nla_total_size(1); /* RTA_TTL_PROPAGATE */
2051
2052 if (rt->rt_nhn == 1) {
2053 struct mpls_nh *nh = rt->rt_nh;
2054
2055 if (nh->nh_dev)
2056 payload += nla_total_size(4); /* RTA_OIF */
2057 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
2058 payload += nla_total_size(2 + nh->nh_via_alen);
2059 if (nh->nh_labels) /* RTA_NEWDST */
2060 payload += nla_total_size(nh->nh_labels * 4);
2061 } else {
2062 /* each nexthop is packed in an attribute */
2063 size_t nhsize = 0;
2064
2065 for_nexthops(rt) {
2066 if (!rtnl_dereference(nh->nh_dev))
2067 continue;
2068 nhsize += nla_total_size(sizeof(struct rtnexthop));
2069 /* RTA_VIA */
2070 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2071 nhsize += nla_total_size(2 + nh->nh_via_alen);
2072 if (nh->nh_labels)
2073 nhsize += nla_total_size(nh->nh_labels * 4);
2074 } endfor_nexthops(rt);
2075 /* nested attribute */
2076 payload += nla_total_size(nhsize);
2077 }
2078
2079 return payload;
2080}
2081
2082static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2083 struct nlmsghdr *nlh, struct net *net, u32 portid,
2084 unsigned int nlm_flags)
2085{
2086 struct sk_buff *skb;
2087 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2088 int err = -ENOBUFS;
2089
2090 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2091 if (skb == NULL)
2092 goto errout;
2093
2094 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2095 if (err < 0) {
2096 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2097 WARN_ON(err == -EMSGSIZE);
2098 kfree_skb(skb);
2099 goto errout;
2100 }
2101 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2102
2103 return;
2104errout:
2105 if (err < 0)
2106 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2107}
2108
2109static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2110 struct netlink_ext_ack *extack)
2111{
2112 struct net *net = sock_net(in_skb->sk);
2113 u32 portid = NETLINK_CB(in_skb).portid;
2114 u32 in_label = LABEL_NOT_SPECIFIED;
2115 struct nlattr *tb[RTA_MAX + 1];
2116 u32 labels[MAX_NEW_LABELS];
2117 struct mpls_shim_hdr *hdr;
2118 unsigned int hdr_size = 0;
2119 struct net_device *dev;
2120 struct mpls_route *rt;
2121 struct rtmsg *rtm, *r;
2122 struct nlmsghdr *nlh;
2123 struct sk_buff *skb;
2124 struct mpls_nh *nh;
2125 u8 n_labels;
2126 int err;
2127
2128 err = nlmsg_parse(in_nlh, sizeof(*rtm), tb, RTA_MAX,
2129 rtm_mpls_policy, extack);
2130 if (err < 0)
2131 goto errout;
2132
2133 rtm = nlmsg_data(in_nlh);
2134
2135 if (tb[RTA_DST]) {
2136 u8 label_count;
2137
2138 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2139 &in_label, extack)) {
2140 err = -EINVAL;
2141 goto errout;
2142 }
2143
2144 if (!mpls_label_ok(net, &in_label, extack)) {
2145 err = -EINVAL;
2146 goto errout;
2147 }
2148 }
2149
2150 rt = mpls_route_input_rcu(net, in_label);
2151 if (!rt) {
2152 err = -ENETUNREACH;
2153 goto errout;
2154 }
2155
2156 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2157 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2158 if (!skb) {
2159 err = -ENOBUFS;
2160 goto errout;
2161 }
2162
2163 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2164 RTM_NEWROUTE, in_label, rt, 0);
2165 if (err < 0) {
2166 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2167 WARN_ON(err == -EMSGSIZE);
2168 goto errout_free;
2169 }
2170
2171 return rtnl_unicast(skb, net, portid);
2172 }
2173
2174 if (tb[RTA_NEWDST]) {
2175 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2176 labels, extack) != 0) {
2177 err = -EINVAL;
2178 goto errout;
2179 }
2180
2181 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2182 }
2183
2184 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2185 if (!skb) {
2186 err = -ENOBUFS;
2187 goto errout;
2188 }
2189
2190 skb->protocol = htons(ETH_P_MPLS_UC);
2191
2192 if (hdr_size) {
2193 bool bos;
2194 int i;
2195
2196 if (skb_cow(skb, hdr_size)) {
2197 err = -ENOBUFS;
2198 goto errout_free;
2199 }
2200
2201 skb_reserve(skb, hdr_size);
2202 skb_push(skb, hdr_size);
2203 skb_reset_network_header(skb);
2204
2205 /* Push new labels */
2206 hdr = mpls_hdr(skb);
2207 bos = true;
2208 for (i = n_labels - 1; i >= 0; i--) {
2209 hdr[i] = mpls_entry_encode(labels[i],
2210 1, 0, bos);
2211 bos = false;
2212 }
2213 }
2214
2215 nh = mpls_select_multipath(rt, skb);
2216 if (!nh) {
2217 err = -ENETUNREACH;
2218 goto errout_free;
2219 }
2220
2221 if (hdr_size) {
2222 skb_pull(skb, hdr_size);
2223 skb_reset_network_header(skb);
2224 }
2225
2226 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2227 RTM_NEWROUTE, sizeof(*r), 0);
2228 if (!nlh) {
2229 err = -EMSGSIZE;
2230 goto errout_free;
2231 }
2232
2233 r = nlmsg_data(nlh);
2234 r->rtm_family = AF_MPLS;
2235 r->rtm_dst_len = 20;
2236 r->rtm_src_len = 0;
2237 r->rtm_table = RT_TABLE_MAIN;
2238 r->rtm_type = RTN_UNICAST;
2239 r->rtm_scope = RT_SCOPE_UNIVERSE;
2240 r->rtm_protocol = rt->rt_protocol;
2241 r->rtm_flags = 0;
2242
2243 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2244 goto nla_put_failure;
2245
2246 if (nh->nh_labels &&
2247 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2248 nh->nh_label))
2249 goto nla_put_failure;
2250
2251 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2252 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2253 nh->nh_via_alen))
2254 goto nla_put_failure;
2255 dev = rtnl_dereference(nh->nh_dev);
2256 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2257 goto nla_put_failure;
2258
2259 nlmsg_end(skb, nlh);
2260
2261 err = rtnl_unicast(skb, net, portid);
2262errout:
2263 return err;
2264
2265nla_put_failure:
2266 nlmsg_cancel(skb, nlh);
2267 err = -EMSGSIZE;
2268errout_free:
2269 kfree_skb(skb);
2270 return err;
2271}
2272
2273static int resize_platform_label_table(struct net *net, size_t limit)
2274{
2275 size_t size = sizeof(struct mpls_route *) * limit;
2276 size_t old_limit;
2277 size_t cp_size;
2278 struct mpls_route __rcu **labels = NULL, **old;
2279 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2280 unsigned index;
2281
2282 if (size) {
2283 labels = kvzalloc(size, GFP_KERNEL);
2284 if (!labels)
2285 goto nolabels;
2286 }
2287
2288 /* In case the predefined labels need to be populated */
2289 if (limit > MPLS_LABEL_IPV4NULL) {
2290 struct net_device *lo = net->loopback_dev;
2291 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2292 if (IS_ERR(rt0))
2293 goto nort0;
2294 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
2295 rt0->rt_protocol = RTPROT_KERNEL;
2296 rt0->rt_payload_type = MPT_IPV4;
2297 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2298 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2299 rt0->rt_nh->nh_via_alen = lo->addr_len;
2300 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2301 lo->addr_len);
2302 }
2303 if (limit > MPLS_LABEL_IPV6NULL) {
2304 struct net_device *lo = net->loopback_dev;
2305 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2306 if (IS_ERR(rt2))
2307 goto nort2;
2308 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
2309 rt2->rt_protocol = RTPROT_KERNEL;
2310 rt2->rt_payload_type = MPT_IPV6;
2311 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2312 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2313 rt2->rt_nh->nh_via_alen = lo->addr_len;
2314 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2315 lo->addr_len);
2316 }
2317
2318 rtnl_lock();
2319 /* Remember the original table */
2320 old = rtnl_dereference(net->mpls.platform_label);
2321 old_limit = net->mpls.platform_labels;
2322
2323 /* Free any labels beyond the new table */
2324 for (index = limit; index < old_limit; index++)
2325 mpls_route_update(net, index, NULL, NULL);
2326
2327 /* Copy over the old labels */
2328 cp_size = size;
2329 if (old_limit < limit)
2330 cp_size = old_limit * sizeof(struct mpls_route *);
2331
2332 memcpy(labels, old, cp_size);
2333
2334 /* If needed set the predefined labels */
2335 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2336 (limit > MPLS_LABEL_IPV6NULL)) {
2337 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2338 rt2 = NULL;
2339 }
2340
2341 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2342 (limit > MPLS_LABEL_IPV4NULL)) {
2343 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2344 rt0 = NULL;
2345 }
2346
2347 /* Update the global pointers */
2348 net->mpls.platform_labels = limit;
2349 rcu_assign_pointer(net->mpls.platform_label, labels);
2350
2351 rtnl_unlock();
2352
2353 mpls_rt_free(rt2);
2354 mpls_rt_free(rt0);
2355
2356 if (old) {
2357 synchronize_rcu();
2358 kvfree(old);
2359 }
2360 return 0;
2361
2362nort2:
2363 mpls_rt_free(rt0);
2364nort0:
2365 kvfree(labels);
2366nolabels:
2367 return -ENOMEM;
2368}
2369
2370static int mpls_platform_labels(struct ctl_table *table, int write,
2371 void __user *buffer, size_t *lenp, loff_t *ppos)
2372{
2373 struct net *net = table->data;
2374 int platform_labels = net->mpls.platform_labels;
2375 int ret;
2376 struct ctl_table tmp = {
2377 .procname = table->procname,
2378 .data = &platform_labels,
2379 .maxlen = sizeof(int),
2380 .mode = table->mode,
2381 .extra1 = &zero,
2382 .extra2 = &label_limit,
2383 };
2384
2385 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2386
2387 if (write && ret == 0)
2388 ret = resize_platform_label_table(net, platform_labels);
2389
2390 return ret;
2391}
2392
2393#define MPLS_NS_SYSCTL_OFFSET(field) \
2394 (&((struct net *)0)->field)
2395
2396static const struct ctl_table mpls_table[] = {
2397 {
2398 .procname = "platform_labels",
2399 .data = NULL,
2400 .maxlen = sizeof(int),
2401 .mode = 0644,
2402 .proc_handler = mpls_platform_labels,
2403 },
2404 {
2405 .procname = "ip_ttl_propagate",
2406 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2407 .maxlen = sizeof(int),
2408 .mode = 0644,
2409 .proc_handler = proc_dointvec_minmax,
2410 .extra1 = &zero,
2411 .extra2 = &one,
2412 },
2413 {
2414 .procname = "default_ttl",
2415 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2416 .maxlen = sizeof(int),
2417 .mode = 0644,
2418 .proc_handler = proc_dointvec_minmax,
2419 .extra1 = &one,
2420 .extra2 = &ttl_max,
2421 },
2422 { }
2423};
2424
2425static int mpls_net_init(struct net *net)
2426{
2427 struct ctl_table *table;
2428 int i;
2429
2430 net->mpls.platform_labels = 0;
2431 net->mpls.platform_label = NULL;
2432 net->mpls.ip_ttl_propagate = 1;
2433 net->mpls.default_ttl = 255;
2434
2435 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2436 if (table == NULL)
2437 return -ENOMEM;
2438
2439 /* Table data contains only offsets relative to the base of
2440 * the mdev at this point, so make them absolute.
2441 */
2442 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2443 table[i].data = (char *)net + (uintptr_t)table[i].data;
2444
2445 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
2446 if (net->mpls.ctl == NULL) {
2447 kfree(table);
2448 return -ENOMEM;
2449 }
2450
2451 return 0;
2452}
2453
2454static void mpls_net_exit(struct net *net)
2455{
2456 struct mpls_route __rcu **platform_label;
2457 size_t platform_labels;
2458 struct ctl_table *table;
2459 unsigned int index;
2460
2461 table = net->mpls.ctl->ctl_table_arg;
2462 unregister_net_sysctl_table(net->mpls.ctl);
2463 kfree(table);
2464
2465 /* An rcu grace period has passed since there was a device in
2466 * the network namespace (and thus the last in flight packet)
2467 * left this network namespace. This is because
2468 * unregister_netdevice_many and netdev_run_todo has completed
2469 * for each network device that was in this network namespace.
2470 *
2471 * As such no additional rcu synchronization is necessary when
2472 * freeing the platform_label table.
2473 */
2474 rtnl_lock();
2475 platform_label = rtnl_dereference(net->mpls.platform_label);
2476 platform_labels = net->mpls.platform_labels;
2477 for (index = 0; index < platform_labels; index++) {
2478 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2479 RCU_INIT_POINTER(platform_label[index], NULL);
2480 mpls_notify_route(net, index, rt, NULL, NULL);
2481 mpls_rt_free(rt);
2482 }
2483 rtnl_unlock();
2484
2485 kvfree(platform_label);
2486}
2487
2488static struct pernet_operations mpls_net_ops = {
2489 .init = mpls_net_init,
2490 .exit = mpls_net_exit,
2491};
2492
2493static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2494 .family = AF_MPLS,
2495 .fill_stats_af = mpls_fill_stats_af,
2496 .get_stats_af_size = mpls_get_stats_af_size,
2497};
2498
2499static int __init mpls_init(void)
2500{
2501 int err;
2502
2503 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2504
2505 err = register_pernet_subsys(&mpls_net_ops);
2506 if (err)
2507 goto out;
2508
2509 err = register_netdevice_notifier(&mpls_dev_notifier);
2510 if (err)
2511 goto out_unregister_pernet;
2512
2513 dev_add_pack(&mpls_packet_type);
2514
2515 rtnl_af_register(&mpls_af_ops);
2516
2517 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2518 mpls_rtm_newroute, NULL, 0);
2519 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2520 mpls_rtm_delroute, NULL, 0);
2521 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2522 mpls_getroute, mpls_dump_routes, 0);
2523 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2524 mpls_netconf_get_devconf,
2525 mpls_netconf_dump_devconf, 0);
2526 err = ipgre_tunnel_encap_add_mpls_ops();
2527 if (err)
2528 pr_err("Can't add mpls over gre tunnel ops\n");
2529
2530 err = 0;
2531out:
2532 return err;
2533
2534out_unregister_pernet:
2535 unregister_pernet_subsys(&mpls_net_ops);
2536 goto out;
2537}
2538module_init(mpls_init);
2539
2540static void __exit mpls_exit(void)
2541{
2542 rtnl_unregister_all(PF_MPLS);
2543 rtnl_af_unregister(&mpls_af_ops);
2544 dev_remove_pack(&mpls_packet_type);
2545 unregister_netdevice_notifier(&mpls_dev_notifier);
2546 unregister_pernet_subsys(&mpls_net_ops);
2547 ipgre_tunnel_encap_del_mpls_ops();
2548}
2549module_exit(mpls_exit);
2550
2551MODULE_DESCRIPTION("MultiProtocol Label Switching");
2552MODULE_LICENSE("GPL v2");
2553MODULE_ALIAS_NETPROTO(PF_MPLS);