This source file includes following definitions.
- ipgre_mpls_encap_hlen
- ipgre_tunnel_encap_add_mpls_ops
- ipgre_tunnel_encap_del_mpls_ops
- ipgre_tunnel_encap_add_mpls_ops
- ipgre_tunnel_encap_del_mpls_ops
- mpls_route_input_rcu
- mpls_output_possible
- __mpls_nh_via
- mpls_nh_via
- mpls_nh_header_size
- mpls_dev_mtu
- mpls_pkt_too_big
- mpls_stats_inc_outucastpkts
- mpls_multipath_hash
- mpls_get_nexthop
- mpls_select_multipath
- mpls_egress
- mpls_forward
- mpls_rt_alloc
- mpls_rt_free
- mpls_notify_route
- mpls_route_update
- find_free_label
- inet_fib_lookup_dev
- inet_fib_lookup_dev
- inet6_fib_lookup_dev
- inet6_fib_lookup_dev
- find_outdev
- mpls_nh_assign_dev
- nla_get_via
- mpls_nh_build_from_cfg
- mpls_nh_build
- mpls_count_nexthops
- mpls_nh_build_multi
- mpls_label_ok
- mpls_route_add
- mpls_route_del
- mpls_get_stats
- mpls_fill_stats_af
- mpls_get_stats_af_size
- mpls_netconf_fill_devconf
- mpls_netconf_msgsize_devconf
- mpls_netconf_notify_devconf
- mpls_netconf_valid_get_req
- mpls_netconf_get_devconf
- mpls_netconf_dump_devconf
- mpls_conf_proc
- mpls_dev_sysctl_register
- mpls_dev_sysctl_unregister
- mpls_add_dev
- mpls_dev_destroy_rcu
- mpls_ifdown
- mpls_ifup
- mpls_dev_notify
- nla_put_via
- nla_put_labels
- nla_get_labels
- rtm_to_route_config
- mpls_rtm_delroute
- mpls_rtm_newroute
- mpls_dump_route
- mpls_valid_fib_dump_req
- mpls_valid_fib_dump_req
- mpls_rt_uses_dev
- mpls_dump_routes
- lfib_nlmsg_size
- rtmsg_lfib
- mpls_valid_getroute_req
- mpls_getroute
- resize_platform_label_table
- mpls_platform_labels
- mpls_net_init
- mpls_net_exit
- mpls_init
- mpls_exit
1
2 #include <linux/types.h>
3 #include <linux/skbuff.h>
4 #include <linux/socket.h>
5 #include <linux/sysctl.h>
6 #include <linux/net.h>
7 #include <linux/module.h>
8 #include <linux/if_arp.h>
9 #include <linux/ipv6.h>
10 #include <linux/mpls.h>
11 #include <linux/netconf.h>
12 #include <linux/nospec.h>
13 #include <linux/vmalloc.h>
14 #include <linux/percpu.h>
15 #include <net/ip.h>
16 #include <net/dst.h>
17 #include <net/sock.h>
18 #include <net/arp.h>
19 #include <net/ip_fib.h>
20 #include <net/netevent.h>
21 #include <net/ip_tunnels.h>
22 #include <net/netns/generic.h>
23 #if IS_ENABLED(CONFIG_IPV6)
24 #include <net/ipv6.h>
25 #endif
26 #include <net/ipv6_stubs.h>
27 #include <net/rtnh.h>
28 #include "internal.h"
29
30
31 #define MAX_MPLS_ROUTE_MEM 4096
32
33
34
35
36 #define MAX_MP_SELECT_LABELS 4
37
38 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
39
40 static int label_limit = (1 << 20) - 1;
41 static int ttl_max = 255;
42
43 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
44 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
45 {
46 return sizeof(struct mpls_shim_hdr);
47 }
48
49 static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
50 .encap_hlen = ipgre_mpls_encap_hlen,
51 };
52
53 static int ipgre_tunnel_encap_add_mpls_ops(void)
54 {
55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
56 }
57
58 static void ipgre_tunnel_encap_del_mpls_ops(void)
59 {
60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
61 }
62 #else
63 static int ipgre_tunnel_encap_add_mpls_ops(void)
64 {
65 return 0;
66 }
67
68 static void ipgre_tunnel_encap_del_mpls_ops(void)
69 {
70 }
71 #endif
72
73 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
74 struct nlmsghdr *nlh, struct net *net, u32 portid,
75 unsigned int nlm_flags);
76
77 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
78 {
79 struct mpls_route *rt = NULL;
80
81 if (index < net->mpls.platform_labels) {
82 struct mpls_route __rcu **platform_label =
83 rcu_dereference(net->mpls.platform_label);
84 rt = rcu_dereference(platform_label[index]);
85 }
86 return rt;
87 }
88
89 bool mpls_output_possible(const struct net_device *dev)
90 {
91 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
92 }
93 EXPORT_SYMBOL_GPL(mpls_output_possible);
94
95 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
96 {
97 return (u8 *)nh + rt->rt_via_offset;
98 }
99
100 static const u8 *mpls_nh_via(const struct mpls_route *rt,
101 const struct mpls_nh *nh)
102 {
103 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
104 }
105
106 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
107 {
108
109 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
110 }
111
112 unsigned int mpls_dev_mtu(const struct net_device *dev)
113 {
114
115 return dev->mtu;
116 }
117 EXPORT_SYMBOL_GPL(mpls_dev_mtu);
118
119 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
120 {
121 if (skb->len <= mtu)
122 return false;
123
124 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
125 return false;
126
127 return true;
128 }
129 EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
130
131 void mpls_stats_inc_outucastpkts(struct net_device *dev,
132 const struct sk_buff *skb)
133 {
134 struct mpls_dev *mdev;
135
136 if (skb->protocol == htons(ETH_P_MPLS_UC)) {
137 mdev = mpls_dev_get(dev);
138 if (mdev)
139 MPLS_INC_STATS_LEN(mdev, skb->len,
140 tx_packets,
141 tx_bytes);
142 } else if (skb->protocol == htons(ETH_P_IP)) {
143 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
144 #if IS_ENABLED(CONFIG_IPV6)
145 } else if (skb->protocol == htons(ETH_P_IPV6)) {
146 struct inet6_dev *in6dev = __in6_dev_get(dev);
147
148 if (in6dev)
149 IP6_UPD_PO_STATS(dev_net(dev), in6dev,
150 IPSTATS_MIB_OUT, skb->len);
151 #endif
152 }
153 }
154 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
155
156 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
157 {
158 struct mpls_entry_decoded dec;
159 unsigned int mpls_hdr_len = 0;
160 struct mpls_shim_hdr *hdr;
161 bool eli_seen = false;
162 int label_index;
163 u32 hash = 0;
164
165 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
166 label_index++) {
167 mpls_hdr_len += sizeof(*hdr);
168 if (!pskb_may_pull(skb, mpls_hdr_len))
169 break;
170
171
172 hdr = mpls_hdr(skb) + label_index;
173 dec = mpls_entry_decode(hdr);
174
175
176
177
178 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
179 hash = jhash_1word(dec.label, hash);
180
181
182
183
184
185
186
187 if (eli_seen)
188 break;
189 } else if (dec.label == MPLS_LABEL_ENTROPY) {
190 eli_seen = true;
191 }
192
193 if (!dec.bos)
194 continue;
195
196
197 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) {
198 const struct iphdr *v4hdr;
199
200 v4hdr = (const struct iphdr *)(hdr + 1);
201 if (v4hdr->version == 4) {
202 hash = jhash_3words(ntohl(v4hdr->saddr),
203 ntohl(v4hdr->daddr),
204 v4hdr->protocol, hash);
205 } else if (v4hdr->version == 6 &&
206 pskb_may_pull(skb, mpls_hdr_len +
207 sizeof(struct ipv6hdr))) {
208 const struct ipv6hdr *v6hdr;
209
210 v6hdr = (const struct ipv6hdr *)(hdr + 1);
211 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
212 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
213 hash = jhash_1word(v6hdr->nexthdr, hash);
214 }
215 }
216
217 break;
218 }
219
220 return hash;
221 }
222
223 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
224 {
225 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
226 }
227
228
229
230
231
232
233 static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
234 struct sk_buff *skb)
235 {
236 u32 hash = 0;
237 int nh_index = 0;
238 int n = 0;
239 u8 alive;
240
241
242
243
244 if (rt->rt_nhn == 1)
245 return rt->rt_nh;
246
247 alive = READ_ONCE(rt->rt_nhn_alive);
248 if (alive == 0)
249 return NULL;
250
251 hash = mpls_multipath_hash(rt, skb);
252 nh_index = hash % alive;
253 if (alive == rt->rt_nhn)
254 goto out;
255 for_nexthops(rt) {
256 unsigned int nh_flags = READ_ONCE(nh->nh_flags);
257
258 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
259 continue;
260 if (n == nh_index)
261 return nh;
262 n++;
263 } endfor_nexthops(rt);
264
265 out:
266 return mpls_get_nexthop(rt, nh_index);
267 }
268
269 static bool mpls_egress(struct net *net, struct mpls_route *rt,
270 struct sk_buff *skb, struct mpls_entry_decoded dec)
271 {
272 enum mpls_payload_type payload_type;
273 bool success = false;
274
275
276
277
278
279
280
281
282
283
284
285 if (!pskb_may_pull(skb, 12))
286 return false;
287
288 payload_type = rt->rt_payload_type;
289 if (payload_type == MPT_UNSPEC)
290 payload_type = ip_hdr(skb)->version;
291
292 switch (payload_type) {
293 case MPT_IPV4: {
294 struct iphdr *hdr4 = ip_hdr(skb);
295 u8 new_ttl;
296 skb->protocol = htons(ETH_P_IP);
297
298
299
300
301
302 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
303 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
304 net->mpls.ip_ttl_propagate))
305 new_ttl = dec.ttl;
306 else
307 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0;
308
309 csum_replace2(&hdr4->check,
310 htons(hdr4->ttl << 8),
311 htons(new_ttl << 8));
312 hdr4->ttl = new_ttl;
313 success = true;
314 break;
315 }
316 case MPT_IPV6: {
317 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
318 skb->protocol = htons(ETH_P_IPV6);
319
320
321
322
323
324 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
325 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
326 net->mpls.ip_ttl_propagate))
327 hdr6->hop_limit = dec.ttl;
328 else if (hdr6->hop_limit)
329 hdr6->hop_limit = hdr6->hop_limit - 1;
330 success = true;
331 break;
332 }
333 case MPT_UNSPEC:
334
335 break;
336 }
337
338 return success;
339 }
340
341 static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
342 struct packet_type *pt, struct net_device *orig_dev)
343 {
344 struct net *net = dev_net(dev);
345 struct mpls_shim_hdr *hdr;
346 struct mpls_route *rt;
347 struct mpls_nh *nh;
348 struct mpls_entry_decoded dec;
349 struct net_device *out_dev;
350 struct mpls_dev *out_mdev;
351 struct mpls_dev *mdev;
352 unsigned int hh_len;
353 unsigned int new_header_size;
354 unsigned int mtu;
355 int err;
356
357
358
359 mdev = mpls_dev_get(dev);
360 if (!mdev)
361 goto drop;
362
363 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets,
364 rx_bytes);
365
366 if (!mdev->input_enabled) {
367 MPLS_INC_STATS(mdev, rx_dropped);
368 goto drop;
369 }
370
371 if (skb->pkt_type != PACKET_HOST)
372 goto err;
373
374 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
375 goto err;
376
377 if (!pskb_may_pull(skb, sizeof(*hdr)))
378 goto err;
379
380
381 hdr = mpls_hdr(skb);
382 dec = mpls_entry_decode(hdr);
383
384 rt = mpls_route_input_rcu(net, dec.label);
385 if (!rt) {
386 MPLS_INC_STATS(mdev, rx_noroute);
387 goto drop;
388 }
389
390 nh = mpls_select_multipath(rt, skb);
391 if (!nh)
392 goto err;
393
394
395 skb_pull(skb, sizeof(*hdr));
396 skb_reset_network_header(skb);
397
398 skb_orphan(skb);
399
400 if (skb_warn_if_lro(skb))
401 goto err;
402
403 skb_forward_csum(skb);
404
405
406 if (dec.ttl <= 1)
407 goto err;
408 dec.ttl -= 1;
409
410
411 out_dev = rcu_dereference(nh->nh_dev);
412 if (!mpls_output_possible(out_dev))
413 goto tx_err;
414
415
416 new_header_size = mpls_nh_header_size(nh);
417 mtu = mpls_dev_mtu(out_dev);
418 if (mpls_pkt_too_big(skb, mtu - new_header_size))
419 goto tx_err;
420
421 hh_len = LL_RESERVED_SPACE(out_dev);
422 if (!out_dev->header_ops)
423 hh_len = 0;
424
425
426 if (skb_cow(skb, hh_len + new_header_size))
427 goto tx_err;
428
429 skb->dev = out_dev;
430 skb->protocol = htons(ETH_P_MPLS_UC);
431
432 if (unlikely(!new_header_size && dec.bos)) {
433
434 if (!mpls_egress(dev_net(out_dev), rt, skb, dec))
435 goto err;
436 } else {
437 bool bos;
438 int i;
439 skb_push(skb, new_header_size);
440 skb_reset_network_header(skb);
441
442 hdr = mpls_hdr(skb);
443 bos = dec.bos;
444 for (i = nh->nh_labels - 1; i >= 0; i--) {
445 hdr[i] = mpls_entry_encode(nh->nh_label[i],
446 dec.ttl, 0, bos);
447 bos = false;
448 }
449 }
450
451 mpls_stats_inc_outucastpkts(out_dev, skb);
452
453
454 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
455 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
456 out_dev->dev_addr, skb);
457 else
458 err = neigh_xmit(nh->nh_via_table, out_dev,
459 mpls_nh_via(rt, nh), skb);
460 if (err)
461 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
462 __func__, err);
463 return 0;
464
465 tx_err:
466 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
467 if (out_mdev)
468 MPLS_INC_STATS(out_mdev, tx_errors);
469 goto drop;
470 err:
471 MPLS_INC_STATS(mdev, rx_errors);
472 drop:
473 kfree_skb(skb);
474 return NET_RX_DROP;
475 }
476
477 static struct packet_type mpls_packet_type __read_mostly = {
478 .type = cpu_to_be16(ETH_P_MPLS_UC),
479 .func = mpls_forward,
480 };
481
482 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
483 [RTA_DST] = { .type = NLA_U32 },
484 [RTA_OIF] = { .type = NLA_U32 },
485 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
486 };
487
488 struct mpls_route_config {
489 u32 rc_protocol;
490 u32 rc_ifindex;
491 u8 rc_via_table;
492 u8 rc_via_alen;
493 u8 rc_via[MAX_VIA_ALEN];
494 u32 rc_label;
495 u8 rc_ttl_propagate;
496 u8 rc_output_labels;
497 u32 rc_output_label[MAX_NEW_LABELS];
498 u32 rc_nlflags;
499 enum mpls_payload_type rc_payload_type;
500 struct nl_info rc_nlinfo;
501 struct rtnexthop *rc_mp;
502 int rc_mp_len;
503 };
504
505
506
507
508 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
509 {
510 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
511 struct mpls_route *rt;
512 size_t size;
513
514 size = sizeof(*rt) + num_nh * nh_size;
515 if (size > MAX_MPLS_ROUTE_MEM)
516 return ERR_PTR(-EINVAL);
517
518 rt = kzalloc(size, GFP_KERNEL);
519 if (!rt)
520 return ERR_PTR(-ENOMEM);
521
522 rt->rt_nhn = num_nh;
523 rt->rt_nhn_alive = num_nh;
524 rt->rt_nh_size = nh_size;
525 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels);
526
527 return rt;
528 }
529
530 static void mpls_rt_free(struct mpls_route *rt)
531 {
532 if (rt)
533 kfree_rcu(rt, rt_rcu);
534 }
535
536 static void mpls_notify_route(struct net *net, unsigned index,
537 struct mpls_route *old, struct mpls_route *new,
538 const struct nl_info *info)
539 {
540 struct nlmsghdr *nlh = info ? info->nlh : NULL;
541 unsigned portid = info ? info->portid : 0;
542 int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
543 struct mpls_route *rt = new ? new : old;
544 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
545
546 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
547 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
548 }
549
550 static void mpls_route_update(struct net *net, unsigned index,
551 struct mpls_route *new,
552 const struct nl_info *info)
553 {
554 struct mpls_route __rcu **platform_label;
555 struct mpls_route *rt;
556
557 ASSERT_RTNL();
558
559 platform_label = rtnl_dereference(net->mpls.platform_label);
560 rt = rtnl_dereference(platform_label[index]);
561 rcu_assign_pointer(platform_label[index], new);
562
563 mpls_notify_route(net, index, rt, new, info);
564
565
566 mpls_rt_free(rt);
567 }
568
569 static unsigned find_free_label(struct net *net)
570 {
571 struct mpls_route __rcu **platform_label;
572 size_t platform_labels;
573 unsigned index;
574
575 platform_label = rtnl_dereference(net->mpls.platform_label);
576 platform_labels = net->mpls.platform_labels;
577 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
578 index++) {
579 if (!rtnl_dereference(platform_label[index]))
580 return index;
581 }
582 return LABEL_NOT_SPECIFIED;
583 }
584
585 #if IS_ENABLED(CONFIG_INET)
586 static struct net_device *inet_fib_lookup_dev(struct net *net,
587 const void *addr)
588 {
589 struct net_device *dev;
590 struct rtable *rt;
591 struct in_addr daddr;
592
593 memcpy(&daddr, addr, sizeof(struct in_addr));
594 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
595 if (IS_ERR(rt))
596 return ERR_CAST(rt);
597
598 dev = rt->dst.dev;
599 dev_hold(dev);
600
601 ip_rt_put(rt);
602
603 return dev;
604 }
605 #else
606 static struct net_device *inet_fib_lookup_dev(struct net *net,
607 const void *addr)
608 {
609 return ERR_PTR(-EAFNOSUPPORT);
610 }
611 #endif
612
613 #if IS_ENABLED(CONFIG_IPV6)
614 static struct net_device *inet6_fib_lookup_dev(struct net *net,
615 const void *addr)
616 {
617 struct net_device *dev;
618 struct dst_entry *dst;
619 struct flowi6 fl6;
620
621 if (!ipv6_stub)
622 return ERR_PTR(-EAFNOSUPPORT);
623
624 memset(&fl6, 0, sizeof(fl6));
625 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
626 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
627 if (IS_ERR(dst))
628 return ERR_CAST(dst);
629
630 dev = dst->dev;
631 dev_hold(dev);
632 dst_release(dst);
633
634 return dev;
635 }
636 #else
637 static struct net_device *inet6_fib_lookup_dev(struct net *net,
638 const void *addr)
639 {
640 return ERR_PTR(-EAFNOSUPPORT);
641 }
642 #endif
643
644 static struct net_device *find_outdev(struct net *net,
645 struct mpls_route *rt,
646 struct mpls_nh *nh, int oif)
647 {
648 struct net_device *dev = NULL;
649
650 if (!oif) {
651 switch (nh->nh_via_table) {
652 case NEIGH_ARP_TABLE:
653 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
654 break;
655 case NEIGH_ND_TABLE:
656 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
657 break;
658 case NEIGH_LINK_TABLE:
659 break;
660 }
661 } else {
662 dev = dev_get_by_index(net, oif);
663 }
664
665 if (!dev)
666 return ERR_PTR(-ENODEV);
667
668 if (IS_ERR(dev))
669 return dev;
670
671
672 dev_put(dev);
673
674 return dev;
675 }
676
677 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
678 struct mpls_nh *nh, int oif)
679 {
680 struct net_device *dev = NULL;
681 int err = -ENODEV;
682
683 dev = find_outdev(net, rt, nh, oif);
684 if (IS_ERR(dev)) {
685 err = PTR_ERR(dev);
686 dev = NULL;
687 goto errout;
688 }
689
690
691 err = -EINVAL;
692 if (!mpls_dev_get(dev))
693 goto errout;
694
695 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
696 (dev->addr_len != nh->nh_via_alen))
697 goto errout;
698
699 RCU_INIT_POINTER(nh->nh_dev, dev);
700
701 if (!(dev->flags & IFF_UP)) {
702 nh->nh_flags |= RTNH_F_DEAD;
703 } else {
704 unsigned int flags;
705
706 flags = dev_get_flags(dev);
707 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
708 nh->nh_flags |= RTNH_F_LINKDOWN;
709 }
710
711 return 0;
712
713 errout:
714 return err;
715 }
716
717 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
718 u8 via_addr[], struct netlink_ext_ack *extack)
719 {
720 struct rtvia *via = nla_data(nla);
721 int err = -EINVAL;
722 int alen;
723
724 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
725 NL_SET_ERR_MSG_ATTR(extack, nla,
726 "Invalid attribute length for RTA_VIA");
727 goto errout;
728 }
729 alen = nla_len(nla) -
730 offsetof(struct rtvia, rtvia_addr);
731 if (alen > MAX_VIA_ALEN) {
732 NL_SET_ERR_MSG_ATTR(extack, nla,
733 "Invalid address length for RTA_VIA");
734 goto errout;
735 }
736
737
738 switch (via->rtvia_family) {
739 case AF_PACKET:
740 *via_table = NEIGH_LINK_TABLE;
741 break;
742 case AF_INET:
743 *via_table = NEIGH_ARP_TABLE;
744 if (alen != 4)
745 goto errout;
746 break;
747 case AF_INET6:
748 *via_table = NEIGH_ND_TABLE;
749 if (alen != 16)
750 goto errout;
751 break;
752 default:
753
754 goto errout;
755 }
756
757 memcpy(via_addr, via->rtvia_addr, alen);
758 *via_alen = alen;
759 err = 0;
760
761 errout:
762 return err;
763 }
764
765 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
766 struct mpls_route *rt)
767 {
768 struct net *net = cfg->rc_nlinfo.nl_net;
769 struct mpls_nh *nh = rt->rt_nh;
770 int err;
771 int i;
772
773 if (!nh)
774 return -ENOMEM;
775
776 nh->nh_labels = cfg->rc_output_labels;
777 for (i = 0; i < nh->nh_labels; i++)
778 nh->nh_label[i] = cfg->rc_output_label[i];
779
780 nh->nh_via_table = cfg->rc_via_table;
781 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
782 nh->nh_via_alen = cfg->rc_via_alen;
783
784 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
785 if (err)
786 goto errout;
787
788 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
789 rt->rt_nhn_alive--;
790
791 return 0;
792
793 errout:
794 return err;
795 }
796
797 static int mpls_nh_build(struct net *net, struct mpls_route *rt,
798 struct mpls_nh *nh, int oif, struct nlattr *via,
799 struct nlattr *newdst, u8 max_labels,
800 struct netlink_ext_ack *extack)
801 {
802 int err = -ENOMEM;
803
804 if (!nh)
805 goto errout;
806
807 if (newdst) {
808 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
809 nh->nh_label, extack);
810 if (err)
811 goto errout;
812 }
813
814 if (via) {
815 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
816 __mpls_nh_via(rt, nh), extack);
817 if (err)
818 goto errout;
819 } else {
820 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
821 }
822
823 err = mpls_nh_assign_dev(net, rt, nh, oif);
824 if (err)
825 goto errout;
826
827 return 0;
828
829 errout:
830 return err;
831 }
832
833 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
834 u8 cfg_via_alen, u8 *max_via_alen,
835 u8 *max_labels)
836 {
837 int remaining = len;
838 u8 nhs = 0;
839
840 *max_via_alen = 0;
841 *max_labels = 0;
842
843 while (rtnh_ok(rtnh, remaining)) {
844 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
845 int attrlen;
846 u8 n_labels = 0;
847
848 attrlen = rtnh_attrlen(rtnh);
849 nla = nla_find(attrs, attrlen, RTA_VIA);
850 if (nla && nla_len(nla) >=
851 offsetof(struct rtvia, rtvia_addr)) {
852 int via_alen = nla_len(nla) -
853 offsetof(struct rtvia, rtvia_addr);
854
855 if (via_alen <= MAX_VIA_ALEN)
856 *max_via_alen = max_t(u16, *max_via_alen,
857 via_alen);
858 }
859
860 nla = nla_find(attrs, attrlen, RTA_NEWDST);
861 if (nla &&
862 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
863 NULL, NULL) != 0)
864 return 0;
865
866 *max_labels = max_t(u8, *max_labels, n_labels);
867
868
869
870
871 if (nhs == 255)
872 return 0;
873 nhs++;
874
875 rtnh = rtnh_next(rtnh, &remaining);
876 }
877
878
879 return remaining > 0 ? 0 : nhs;
880 }
881
882 static int mpls_nh_build_multi(struct mpls_route_config *cfg,
883 struct mpls_route *rt, u8 max_labels,
884 struct netlink_ext_ack *extack)
885 {
886 struct rtnexthop *rtnh = cfg->rc_mp;
887 struct nlattr *nla_via, *nla_newdst;
888 int remaining = cfg->rc_mp_len;
889 int err = 0;
890 u8 nhs = 0;
891
892 change_nexthops(rt) {
893 int attrlen;
894
895 nla_via = NULL;
896 nla_newdst = NULL;
897
898 err = -EINVAL;
899 if (!rtnh_ok(rtnh, remaining))
900 goto errout;
901
902
903
904
905 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
906 goto errout;
907
908 attrlen = rtnh_attrlen(rtnh);
909 if (attrlen > 0) {
910 struct nlattr *attrs = rtnh_attrs(rtnh);
911
912 nla_via = nla_find(attrs, attrlen, RTA_VIA);
913 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
914 }
915
916 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
917 rtnh->rtnh_ifindex, nla_via, nla_newdst,
918 max_labels, extack);
919 if (err)
920 goto errout;
921
922 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
923 rt->rt_nhn_alive--;
924
925 rtnh = rtnh_next(rtnh, &remaining);
926 nhs++;
927 } endfor_nexthops(rt);
928
929 rt->rt_nhn = nhs;
930
931 return 0;
932
933 errout:
934 return err;
935 }
936
937 static bool mpls_label_ok(struct net *net, unsigned int *index,
938 struct netlink_ext_ack *extack)
939 {
940 bool is_ok = true;
941
942
943 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
944 NL_SET_ERR_MSG(extack,
945 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
946 is_ok = false;
947 }
948
949
950 if (is_ok && *index >= net->mpls.platform_labels) {
951 NL_SET_ERR_MSG(extack,
952 "Label >= configured maximum in platform_labels");
953 is_ok = false;
954 }
955
956 *index = array_index_nospec(*index, net->mpls.platform_labels);
957 return is_ok;
958 }
959
960 static int mpls_route_add(struct mpls_route_config *cfg,
961 struct netlink_ext_ack *extack)
962 {
963 struct mpls_route __rcu **platform_label;
964 struct net *net = cfg->rc_nlinfo.nl_net;
965 struct mpls_route *rt, *old;
966 int err = -EINVAL;
967 u8 max_via_alen;
968 unsigned index;
969 u8 max_labels;
970 u8 nhs;
971
972 index = cfg->rc_label;
973
974
975 if ((index == LABEL_NOT_SPECIFIED) &&
976 (cfg->rc_nlflags & NLM_F_CREATE)) {
977 index = find_free_label(net);
978 }
979
980 if (!mpls_label_ok(net, &index, extack))
981 goto errout;
982
983
984 err = -EOPNOTSUPP;
985 if (cfg->rc_nlflags & NLM_F_APPEND) {
986 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
987 goto errout;
988 }
989
990 err = -EEXIST;
991 platform_label = rtnl_dereference(net->mpls.platform_label);
992 old = rtnl_dereference(platform_label[index]);
993 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
994 goto errout;
995
996 err = -EEXIST;
997 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
998 goto errout;
999
1000 err = -ENOENT;
1001 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1002 goto errout;
1003
1004 err = -EINVAL;
1005 if (cfg->rc_mp) {
1006 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1007 cfg->rc_via_alen, &max_via_alen,
1008 &max_labels);
1009 } else {
1010 max_via_alen = cfg->rc_via_alen;
1011 max_labels = cfg->rc_output_labels;
1012 nhs = 1;
1013 }
1014
1015 if (nhs == 0) {
1016 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
1017 goto errout;
1018 }
1019
1020 err = -ENOMEM;
1021 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1022 if (IS_ERR(rt)) {
1023 err = PTR_ERR(rt);
1024 goto errout;
1025 }
1026
1027 rt->rt_protocol = cfg->rc_protocol;
1028 rt->rt_payload_type = cfg->rc_payload_type;
1029 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1030
1031 if (cfg->rc_mp)
1032 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1033 else
1034 err = mpls_nh_build_from_cfg(cfg, rt);
1035 if (err)
1036 goto freert;
1037
1038 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1039
1040 return 0;
1041
1042 freert:
1043 mpls_rt_free(rt);
1044 errout:
1045 return err;
1046 }
1047
1048 static int mpls_route_del(struct mpls_route_config *cfg,
1049 struct netlink_ext_ack *extack)
1050 {
1051 struct net *net = cfg->rc_nlinfo.nl_net;
1052 unsigned index;
1053 int err = -EINVAL;
1054
1055 index = cfg->rc_label;
1056
1057 if (!mpls_label_ok(net, &index, extack))
1058 goto errout;
1059
1060 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1061
1062 err = 0;
1063 errout:
1064 return err;
1065 }
1066
1067 static void mpls_get_stats(struct mpls_dev *mdev,
1068 struct mpls_link_stats *stats)
1069 {
1070 struct mpls_pcpu_stats *p;
1071 int i;
1072
1073 memset(stats, 0, sizeof(*stats));
1074
1075 for_each_possible_cpu(i) {
1076 struct mpls_link_stats local;
1077 unsigned int start;
1078
1079 p = per_cpu_ptr(mdev->stats, i);
1080 do {
1081 start = u64_stats_fetch_begin(&p->syncp);
1082 local = p->stats;
1083 } while (u64_stats_fetch_retry(&p->syncp, start));
1084
1085 stats->rx_packets += local.rx_packets;
1086 stats->rx_bytes += local.rx_bytes;
1087 stats->tx_packets += local.tx_packets;
1088 stats->tx_bytes += local.tx_bytes;
1089 stats->rx_errors += local.rx_errors;
1090 stats->tx_errors += local.tx_errors;
1091 stats->rx_dropped += local.rx_dropped;
1092 stats->tx_dropped += local.tx_dropped;
1093 stats->rx_noroute += local.rx_noroute;
1094 }
1095 }
1096
1097 static int mpls_fill_stats_af(struct sk_buff *skb,
1098 const struct net_device *dev)
1099 {
1100 struct mpls_link_stats *stats;
1101 struct mpls_dev *mdev;
1102 struct nlattr *nla;
1103
1104 mdev = mpls_dev_get(dev);
1105 if (!mdev)
1106 return -ENODATA;
1107
1108 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1109 sizeof(struct mpls_link_stats),
1110 MPLS_STATS_UNSPEC);
1111 if (!nla)
1112 return -EMSGSIZE;
1113
1114 stats = nla_data(nla);
1115 mpls_get_stats(mdev, stats);
1116
1117 return 0;
1118 }
1119
1120 static size_t mpls_get_stats_af_size(const struct net_device *dev)
1121 {
1122 struct mpls_dev *mdev;
1123
1124 mdev = mpls_dev_get(dev);
1125 if (!mdev)
1126 return 0;
1127
1128 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1129 }
1130
1131 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1132 u32 portid, u32 seq, int event,
1133 unsigned int flags, int type)
1134 {
1135 struct nlmsghdr *nlh;
1136 struct netconfmsg *ncm;
1137 bool all = false;
1138
1139 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1140 flags);
1141 if (!nlh)
1142 return -EMSGSIZE;
1143
1144 if (type == NETCONFA_ALL)
1145 all = true;
1146
1147 ncm = nlmsg_data(nlh);
1148 ncm->ncm_family = AF_MPLS;
1149
1150 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1151 goto nla_put_failure;
1152
1153 if ((all || type == NETCONFA_INPUT) &&
1154 nla_put_s32(skb, NETCONFA_INPUT,
1155 mdev->input_enabled) < 0)
1156 goto nla_put_failure;
1157
1158 nlmsg_end(skb, nlh);
1159 return 0;
1160
1161 nla_put_failure:
1162 nlmsg_cancel(skb, nlh);
1163 return -EMSGSIZE;
1164 }
1165
1166 static int mpls_netconf_msgsize_devconf(int type)
1167 {
1168 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1169 + nla_total_size(4);
1170 bool all = false;
1171
1172 if (type == NETCONFA_ALL)
1173 all = true;
1174
1175 if (all || type == NETCONFA_INPUT)
1176 size += nla_total_size(4);
1177
1178 return size;
1179 }
1180
1181 static void mpls_netconf_notify_devconf(struct net *net, int event,
1182 int type, struct mpls_dev *mdev)
1183 {
1184 struct sk_buff *skb;
1185 int err = -ENOBUFS;
1186
1187 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1188 if (!skb)
1189 goto errout;
1190
1191 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1192 if (err < 0) {
1193
1194 WARN_ON(err == -EMSGSIZE);
1195 kfree_skb(skb);
1196 goto errout;
1197 }
1198
1199 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1200 return;
1201 errout:
1202 if (err < 0)
1203 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1204 }
1205
1206 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1207 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1208 };
1209
1210 static int mpls_netconf_valid_get_req(struct sk_buff *skb,
1211 const struct nlmsghdr *nlh,
1212 struct nlattr **tb,
1213 struct netlink_ext_ack *extack)
1214 {
1215 int i, err;
1216
1217 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
1218 NL_SET_ERR_MSG_MOD(extack,
1219 "Invalid header for netconf get request");
1220 return -EINVAL;
1221 }
1222
1223 if (!netlink_strict_get_check(skb))
1224 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
1225 tb, NETCONFA_MAX,
1226 devconf_mpls_policy, extack);
1227
1228 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
1229 tb, NETCONFA_MAX,
1230 devconf_mpls_policy, extack);
1231 if (err)
1232 return err;
1233
1234 for (i = 0; i <= NETCONFA_MAX; i++) {
1235 if (!tb[i])
1236 continue;
1237
1238 switch (i) {
1239 case NETCONFA_IFINDEX:
1240 break;
1241 default:
1242 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
1243 return -EINVAL;
1244 }
1245 }
1246
1247 return 0;
1248 }
1249
1250 static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1251 struct nlmsghdr *nlh,
1252 struct netlink_ext_ack *extack)
1253 {
1254 struct net *net = sock_net(in_skb->sk);
1255 struct nlattr *tb[NETCONFA_MAX + 1];
1256 struct net_device *dev;
1257 struct mpls_dev *mdev;
1258 struct sk_buff *skb;
1259 int ifindex;
1260 int err;
1261
1262 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
1263 if (err < 0)
1264 goto errout;
1265
1266 err = -EINVAL;
1267 if (!tb[NETCONFA_IFINDEX])
1268 goto errout;
1269
1270 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1271 dev = __dev_get_by_index(net, ifindex);
1272 if (!dev)
1273 goto errout;
1274
1275 mdev = mpls_dev_get(dev);
1276 if (!mdev)
1277 goto errout;
1278
1279 err = -ENOBUFS;
1280 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1281 if (!skb)
1282 goto errout;
1283
1284 err = mpls_netconf_fill_devconf(skb, mdev,
1285 NETLINK_CB(in_skb).portid,
1286 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1287 NETCONFA_ALL);
1288 if (err < 0) {
1289
1290 WARN_ON(err == -EMSGSIZE);
1291 kfree_skb(skb);
1292 goto errout;
1293 }
1294 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1295 errout:
1296 return err;
1297 }
1298
1299 static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1300 struct netlink_callback *cb)
1301 {
1302 const struct nlmsghdr *nlh = cb->nlh;
1303 struct net *net = sock_net(skb->sk);
1304 struct hlist_head *head;
1305 struct net_device *dev;
1306 struct mpls_dev *mdev;
1307 int idx, s_idx;
1308 int h, s_h;
1309
1310 if (cb->strict_check) {
1311 struct netlink_ext_ack *extack = cb->extack;
1312 struct netconfmsg *ncm;
1313
1314 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1315 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1316 return -EINVAL;
1317 }
1318
1319 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1320 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1321 return -EINVAL;
1322 }
1323 }
1324
1325 s_h = cb->args[0];
1326 s_idx = idx = cb->args[1];
1327
1328 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1329 idx = 0;
1330 head = &net->dev_index_head[h];
1331 rcu_read_lock();
1332 cb->seq = net->dev_base_seq;
1333 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1334 if (idx < s_idx)
1335 goto cont;
1336 mdev = mpls_dev_get(dev);
1337 if (!mdev)
1338 goto cont;
1339 if (mpls_netconf_fill_devconf(skb, mdev,
1340 NETLINK_CB(cb->skb).portid,
1341 nlh->nlmsg_seq,
1342 RTM_NEWNETCONF,
1343 NLM_F_MULTI,
1344 NETCONFA_ALL) < 0) {
1345 rcu_read_unlock();
1346 goto done;
1347 }
1348 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1349 cont:
1350 idx++;
1351 }
1352 rcu_read_unlock();
1353 }
1354 done:
1355 cb->args[0] = h;
1356 cb->args[1] = idx;
1357
1358 return skb->len;
1359 }
1360
1361 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1362 (&((struct mpls_dev *)0)->field)
1363
1364 static int mpls_conf_proc(struct ctl_table *ctl, int write,
1365 void __user *buffer,
1366 size_t *lenp, loff_t *ppos)
1367 {
1368 int oval = *(int *)ctl->data;
1369 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1370
1371 if (write) {
1372 struct mpls_dev *mdev = ctl->extra1;
1373 int i = (int *)ctl->data - (int *)mdev;
1374 struct net *net = ctl->extra2;
1375 int val = *(int *)ctl->data;
1376
1377 if (i == offsetof(struct mpls_dev, input_enabled) &&
1378 val != oval) {
1379 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1380 NETCONFA_INPUT, mdev);
1381 }
1382 }
1383
1384 return ret;
1385 }
1386
1387 static const struct ctl_table mpls_dev_table[] = {
1388 {
1389 .procname = "input",
1390 .maxlen = sizeof(int),
1391 .mode = 0644,
1392 .proc_handler = mpls_conf_proc,
1393 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1394 },
1395 { }
1396 };
1397
1398 static int mpls_dev_sysctl_register(struct net_device *dev,
1399 struct mpls_dev *mdev)
1400 {
1401 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1402 struct net *net = dev_net(dev);
1403 struct ctl_table *table;
1404 int i;
1405
1406 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1407 if (!table)
1408 goto out;
1409
1410
1411
1412
1413 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
1414 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1415 table[i].extra1 = mdev;
1416 table[i].extra2 = net;
1417 }
1418
1419 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1420
1421 mdev->sysctl = register_net_sysctl(net, path, table);
1422 if (!mdev->sysctl)
1423 goto free;
1424
1425 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1426 return 0;
1427
1428 free:
1429 kfree(table);
1430 out:
1431 return -ENOBUFS;
1432 }
1433
1434 static void mpls_dev_sysctl_unregister(struct net_device *dev,
1435 struct mpls_dev *mdev)
1436 {
1437 struct net *net = dev_net(dev);
1438 struct ctl_table *table;
1439
1440 table = mdev->sysctl->ctl_table_arg;
1441 unregister_net_sysctl_table(mdev->sysctl);
1442 kfree(table);
1443
1444 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1445 }
1446
1447 static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1448 {
1449 struct mpls_dev *mdev;
1450 int err = -ENOMEM;
1451 int i;
1452
1453 ASSERT_RTNL();
1454
1455 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1456 if (!mdev)
1457 return ERR_PTR(err);
1458
1459 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1460 if (!mdev->stats)
1461 goto free;
1462
1463 for_each_possible_cpu(i) {
1464 struct mpls_pcpu_stats *mpls_stats;
1465
1466 mpls_stats = per_cpu_ptr(mdev->stats, i);
1467 u64_stats_init(&mpls_stats->syncp);
1468 }
1469
1470 mdev->dev = dev;
1471
1472 err = mpls_dev_sysctl_register(dev, mdev);
1473 if (err)
1474 goto free;
1475
1476 rcu_assign_pointer(dev->mpls_ptr, mdev);
1477
1478 return mdev;
1479
1480 free:
1481 free_percpu(mdev->stats);
1482 kfree(mdev);
1483 return ERR_PTR(err);
1484 }
1485
1486 static void mpls_dev_destroy_rcu(struct rcu_head *head)
1487 {
1488 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1489
1490 free_percpu(mdev->stats);
1491 kfree(mdev);
1492 }
1493
1494 static void mpls_ifdown(struct net_device *dev, int event)
1495 {
1496 struct mpls_route __rcu **platform_label;
1497 struct net *net = dev_net(dev);
1498 u8 alive, deleted;
1499 unsigned index;
1500
1501 platform_label = rtnl_dereference(net->mpls.platform_label);
1502 for (index = 0; index < net->mpls.platform_labels; index++) {
1503 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1504
1505 if (!rt)
1506 continue;
1507
1508 alive = 0;
1509 deleted = 0;
1510 change_nexthops(rt) {
1511 unsigned int nh_flags = nh->nh_flags;
1512
1513 if (rtnl_dereference(nh->nh_dev) != dev)
1514 goto next;
1515
1516 switch (event) {
1517 case NETDEV_DOWN:
1518 case NETDEV_UNREGISTER:
1519 nh_flags |= RTNH_F_DEAD;
1520
1521 case NETDEV_CHANGE:
1522 nh_flags |= RTNH_F_LINKDOWN;
1523 break;
1524 }
1525 if (event == NETDEV_UNREGISTER)
1526 RCU_INIT_POINTER(nh->nh_dev, NULL);
1527
1528 if (nh->nh_flags != nh_flags)
1529 WRITE_ONCE(nh->nh_flags, nh_flags);
1530 next:
1531 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1532 alive++;
1533 if (!rtnl_dereference(nh->nh_dev))
1534 deleted++;
1535 } endfor_nexthops(rt);
1536
1537 WRITE_ONCE(rt->rt_nhn_alive, alive);
1538
1539
1540 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
1541 mpls_route_update(net, index, NULL, NULL);
1542 }
1543 }
1544
1545 static void mpls_ifup(struct net_device *dev, unsigned int flags)
1546 {
1547 struct mpls_route __rcu **platform_label;
1548 struct net *net = dev_net(dev);
1549 unsigned index;
1550 u8 alive;
1551
1552 platform_label = rtnl_dereference(net->mpls.platform_label);
1553 for (index = 0; index < net->mpls.platform_labels; index++) {
1554 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1555
1556 if (!rt)
1557 continue;
1558
1559 alive = 0;
1560 change_nexthops(rt) {
1561 unsigned int nh_flags = nh->nh_flags;
1562 struct net_device *nh_dev =
1563 rtnl_dereference(nh->nh_dev);
1564
1565 if (!(nh_flags & flags)) {
1566 alive++;
1567 continue;
1568 }
1569 if (nh_dev != dev)
1570 continue;
1571 alive++;
1572 nh_flags &= ~flags;
1573 WRITE_ONCE(nh->nh_flags, nh_flags);
1574 } endfor_nexthops(rt);
1575
1576 WRITE_ONCE(rt->rt_nhn_alive, alive);
1577 }
1578 }
1579
1580 static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1581 void *ptr)
1582 {
1583 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1584 struct mpls_dev *mdev;
1585 unsigned int flags;
1586
1587 if (event == NETDEV_REGISTER) {
1588
1589
1590
1591
1592 if (dev->type == ARPHRD_ETHER ||
1593 dev->type == ARPHRD_LOOPBACK ||
1594 dev->type == ARPHRD_IPGRE ||
1595 dev->type == ARPHRD_IP6GRE ||
1596 dev->type == ARPHRD_SIT ||
1597 dev->type == ARPHRD_TUNNEL) {
1598 mdev = mpls_add_dev(dev);
1599 if (IS_ERR(mdev))
1600 return notifier_from_errno(PTR_ERR(mdev));
1601 }
1602 return NOTIFY_OK;
1603 }
1604
1605 mdev = mpls_dev_get(dev);
1606 if (!mdev)
1607 return NOTIFY_OK;
1608
1609 switch (event) {
1610 case NETDEV_DOWN:
1611 mpls_ifdown(dev, event);
1612 break;
1613 case NETDEV_UP:
1614 flags = dev_get_flags(dev);
1615 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1616 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1617 else
1618 mpls_ifup(dev, RTNH_F_DEAD);
1619 break;
1620 case NETDEV_CHANGE:
1621 flags = dev_get_flags(dev);
1622 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1623 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1624 else
1625 mpls_ifdown(dev, event);
1626 break;
1627 case NETDEV_UNREGISTER:
1628 mpls_ifdown(dev, event);
1629 mdev = mpls_dev_get(dev);
1630 if (mdev) {
1631 mpls_dev_sysctl_unregister(dev, mdev);
1632 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1633 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1634 }
1635 break;
1636 case NETDEV_CHANGENAME:
1637 mdev = mpls_dev_get(dev);
1638 if (mdev) {
1639 int err;
1640
1641 mpls_dev_sysctl_unregister(dev, mdev);
1642 err = mpls_dev_sysctl_register(dev, mdev);
1643 if (err)
1644 return notifier_from_errno(err);
1645 }
1646 break;
1647 }
1648 return NOTIFY_OK;
1649 }
1650
1651 static struct notifier_block mpls_dev_notifier = {
1652 .notifier_call = mpls_dev_notify,
1653 };
1654
1655 static int nla_put_via(struct sk_buff *skb,
1656 u8 table, const void *addr, int alen)
1657 {
1658 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1659 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1660 };
1661 struct nlattr *nla;
1662 struct rtvia *via;
1663 int family = AF_UNSPEC;
1664
1665 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1666 if (!nla)
1667 return -EMSGSIZE;
1668
1669 if (table <= NEIGH_NR_TABLES)
1670 family = table_to_family[table];
1671
1672 via = nla_data(nla);
1673 via->rtvia_family = family;
1674 memcpy(via->rtvia_addr, addr, alen);
1675 return 0;
1676 }
1677
1678 int nla_put_labels(struct sk_buff *skb, int attrtype,
1679 u8 labels, const u32 label[])
1680 {
1681 struct nlattr *nla;
1682 struct mpls_shim_hdr *nla_label;
1683 bool bos;
1684 int i;
1685 nla = nla_reserve(skb, attrtype, labels*4);
1686 if (!nla)
1687 return -EMSGSIZE;
1688
1689 nla_label = nla_data(nla);
1690 bos = true;
1691 for (i = labels - 1; i >= 0; i--) {
1692 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1693 bos = false;
1694 }
1695
1696 return 0;
1697 }
1698 EXPORT_SYMBOL_GPL(nla_put_labels);
1699
1700 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1701 u32 label[], struct netlink_ext_ack *extack)
1702 {
1703 unsigned len = nla_len(nla);
1704 struct mpls_shim_hdr *nla_label;
1705 u8 nla_labels;
1706 bool bos;
1707 int i;
1708
1709
1710
1711
1712 if (len & 3 || len / 4 > 255) {
1713 NL_SET_ERR_MSG_ATTR(extack, nla,
1714 "Invalid length for labels attribute");
1715 return -EINVAL;
1716 }
1717
1718
1719 nla_labels = len/4;
1720 if (nla_labels > max_labels) {
1721 NL_SET_ERR_MSG(extack, "Too many labels");
1722 return -EINVAL;
1723 }
1724
1725
1726 if (!label)
1727 goto out;
1728
1729 nla_label = nla_data(nla);
1730 bos = true;
1731 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1732 struct mpls_entry_decoded dec;
1733 dec = mpls_entry_decode(nla_label + i);
1734
1735
1736
1737
1738 if (dec.ttl) {
1739 NL_SET_ERR_MSG_ATTR(extack, nla,
1740 "TTL in label must be 0");
1741 return -EINVAL;
1742 }
1743
1744 if (dec.tc) {
1745 NL_SET_ERR_MSG_ATTR(extack, nla,
1746 "Traffic class in label must be 0");
1747 return -EINVAL;
1748 }
1749
1750 if (dec.bos != bos) {
1751 NL_SET_BAD_ATTR(extack, nla);
1752 if (bos) {
1753 NL_SET_ERR_MSG(extack,
1754 "BOS bit must be set in first label");
1755 } else {
1756 NL_SET_ERR_MSG(extack,
1757 "BOS bit can only be set in first label");
1758 }
1759 return -EINVAL;
1760 }
1761
1762 switch (dec.label) {
1763 case MPLS_LABEL_IMPLNULL:
1764
1765
1766
1767
1768 NL_SET_ERR_MSG_ATTR(extack, nla,
1769 "Implicit NULL Label (3) can not be used in encapsulation");
1770 return -EINVAL;
1771 }
1772
1773 label[i] = dec.label;
1774 }
1775 out:
1776 *labels = nla_labels;
1777 return 0;
1778 }
1779 EXPORT_SYMBOL_GPL(nla_get_labels);
1780
1781 static int rtm_to_route_config(struct sk_buff *skb,
1782 struct nlmsghdr *nlh,
1783 struct mpls_route_config *cfg,
1784 struct netlink_ext_ack *extack)
1785 {
1786 struct rtmsg *rtm;
1787 struct nlattr *tb[RTA_MAX+1];
1788 int index;
1789 int err;
1790
1791 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1792 rtm_mpls_policy, extack);
1793 if (err < 0)
1794 goto errout;
1795
1796 err = -EINVAL;
1797 rtm = nlmsg_data(nlh);
1798
1799 if (rtm->rtm_family != AF_MPLS) {
1800 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1801 goto errout;
1802 }
1803 if (rtm->rtm_dst_len != 20) {
1804 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1805 goto errout;
1806 }
1807 if (rtm->rtm_src_len != 0) {
1808 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1809 goto errout;
1810 }
1811 if (rtm->rtm_tos != 0) {
1812 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1813 goto errout;
1814 }
1815 if (rtm->rtm_table != RT_TABLE_MAIN) {
1816 NL_SET_ERR_MSG(extack,
1817 "MPLS only supports the main route table");
1818 goto errout;
1819 }
1820
1821
1822
1823
1824
1825
1826 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1827 NL_SET_ERR_MSG(extack,
1828 "Invalid route scope - MPLS only supports UNIVERSE");
1829 goto errout;
1830 }
1831 if (rtm->rtm_type != RTN_UNICAST) {
1832 NL_SET_ERR_MSG(extack,
1833 "Invalid route type - MPLS only supports UNICAST");
1834 goto errout;
1835 }
1836 if (rtm->rtm_flags != 0) {
1837 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1838 goto errout;
1839 }
1840
1841 cfg->rc_label = LABEL_NOT_SPECIFIED;
1842 cfg->rc_protocol = rtm->rtm_protocol;
1843 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1844 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1845 cfg->rc_nlflags = nlh->nlmsg_flags;
1846 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1847 cfg->rc_nlinfo.nlh = nlh;
1848 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1849
1850 for (index = 0; index <= RTA_MAX; index++) {
1851 struct nlattr *nla = tb[index];
1852 if (!nla)
1853 continue;
1854
1855 switch (index) {
1856 case RTA_OIF:
1857 cfg->rc_ifindex = nla_get_u32(nla);
1858 break;
1859 case RTA_NEWDST:
1860 if (nla_get_labels(nla, MAX_NEW_LABELS,
1861 &cfg->rc_output_labels,
1862 cfg->rc_output_label, extack))
1863 goto errout;
1864 break;
1865 case RTA_DST:
1866 {
1867 u8 label_count;
1868 if (nla_get_labels(nla, 1, &label_count,
1869 &cfg->rc_label, extack))
1870 goto errout;
1871
1872 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1873 &cfg->rc_label, extack))
1874 goto errout;
1875 break;
1876 }
1877 case RTA_GATEWAY:
1878 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
1879 goto errout;
1880 case RTA_VIA:
1881 {
1882 if (nla_get_via(nla, &cfg->rc_via_alen,
1883 &cfg->rc_via_table, cfg->rc_via,
1884 extack))
1885 goto errout;
1886 break;
1887 }
1888 case RTA_MULTIPATH:
1889 {
1890 cfg->rc_mp = nla_data(nla);
1891 cfg->rc_mp_len = nla_len(nla);
1892 break;
1893 }
1894 case RTA_TTL_PROPAGATE:
1895 {
1896 u8 ttl_propagate = nla_get_u8(nla);
1897
1898 if (ttl_propagate > 1) {
1899 NL_SET_ERR_MSG_ATTR(extack, nla,
1900 "RTA_TTL_PROPAGATE can only be 0 or 1");
1901 goto errout;
1902 }
1903 cfg->rc_ttl_propagate = ttl_propagate ?
1904 MPLS_TTL_PROP_ENABLED :
1905 MPLS_TTL_PROP_DISABLED;
1906 break;
1907 }
1908 default:
1909 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1910
1911 goto errout;
1912 }
1913 }
1914
1915 err = 0;
1916 errout:
1917 return err;
1918 }
1919
1920 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1921 struct netlink_ext_ack *extack)
1922 {
1923 struct mpls_route_config *cfg;
1924 int err;
1925
1926 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1927 if (!cfg)
1928 return -ENOMEM;
1929
1930 err = rtm_to_route_config(skb, nlh, cfg, extack);
1931 if (err < 0)
1932 goto out;
1933
1934 err = mpls_route_del(cfg, extack);
1935 out:
1936 kfree(cfg);
1937
1938 return err;
1939 }
1940
1941
1942 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1943 struct netlink_ext_ack *extack)
1944 {
1945 struct mpls_route_config *cfg;
1946 int err;
1947
1948 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1949 if (!cfg)
1950 return -ENOMEM;
1951
1952 err = rtm_to_route_config(skb, nlh, cfg, extack);
1953 if (err < 0)
1954 goto out;
1955
1956 err = mpls_route_add(cfg, extack);
1957 out:
1958 kfree(cfg);
1959
1960 return err;
1961 }
1962
1963 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1964 u32 label, struct mpls_route *rt, int flags)
1965 {
1966 struct net_device *dev;
1967 struct nlmsghdr *nlh;
1968 struct rtmsg *rtm;
1969
1970 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1971 if (nlh == NULL)
1972 return -EMSGSIZE;
1973
1974 rtm = nlmsg_data(nlh);
1975 rtm->rtm_family = AF_MPLS;
1976 rtm->rtm_dst_len = 20;
1977 rtm->rtm_src_len = 0;
1978 rtm->rtm_tos = 0;
1979 rtm->rtm_table = RT_TABLE_MAIN;
1980 rtm->rtm_protocol = rt->rt_protocol;
1981 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1982 rtm->rtm_type = RTN_UNICAST;
1983 rtm->rtm_flags = 0;
1984
1985 if (nla_put_labels(skb, RTA_DST, 1, &label))
1986 goto nla_put_failure;
1987
1988 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1989 bool ttl_propagate =
1990 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1991
1992 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
1993 ttl_propagate))
1994 goto nla_put_failure;
1995 }
1996 if (rt->rt_nhn == 1) {
1997 const struct mpls_nh *nh = rt->rt_nh;
1998
1999 if (nh->nh_labels &&
2000 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2001 nh->nh_label))
2002 goto nla_put_failure;
2003 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2004 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2005 nh->nh_via_alen))
2006 goto nla_put_failure;
2007 dev = rtnl_dereference(nh->nh_dev);
2008 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2009 goto nla_put_failure;
2010 if (nh->nh_flags & RTNH_F_LINKDOWN)
2011 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2012 if (nh->nh_flags & RTNH_F_DEAD)
2013 rtm->rtm_flags |= RTNH_F_DEAD;
2014 } else {
2015 struct rtnexthop *rtnh;
2016 struct nlattr *mp;
2017 u8 linkdown = 0;
2018 u8 dead = 0;
2019
2020 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
2021 if (!mp)
2022 goto nla_put_failure;
2023
2024 for_nexthops(rt) {
2025 dev = rtnl_dereference(nh->nh_dev);
2026 if (!dev)
2027 continue;
2028
2029 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
2030 if (!rtnh)
2031 goto nla_put_failure;
2032
2033 rtnh->rtnh_ifindex = dev->ifindex;
2034 if (nh->nh_flags & RTNH_F_LINKDOWN) {
2035 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
2036 linkdown++;
2037 }
2038 if (nh->nh_flags & RTNH_F_DEAD) {
2039 rtnh->rtnh_flags |= RTNH_F_DEAD;
2040 dead++;
2041 }
2042
2043 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2044 nh->nh_labels,
2045 nh->nh_label))
2046 goto nla_put_failure;
2047 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2048 nla_put_via(skb, nh->nh_via_table,
2049 mpls_nh_via(rt, nh),
2050 nh->nh_via_alen))
2051 goto nla_put_failure;
2052
2053
2054 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2055 } endfor_nexthops(rt);
2056
2057 if (linkdown == rt->rt_nhn)
2058 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2059 if (dead == rt->rt_nhn)
2060 rtm->rtm_flags |= RTNH_F_DEAD;
2061
2062 nla_nest_end(skb, mp);
2063 }
2064
2065 nlmsg_end(skb, nlh);
2066 return 0;
2067
2068 nla_put_failure:
2069 nlmsg_cancel(skb, nlh);
2070 return -EMSGSIZE;
2071 }
2072
2073 #if IS_ENABLED(CONFIG_INET)
2074 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2075 struct fib_dump_filter *filter,
2076 struct netlink_callback *cb)
2077 {
2078 return ip_valid_fib_dump_req(net, nlh, filter, cb);
2079 }
2080 #else
2081 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2082 struct fib_dump_filter *filter,
2083 struct netlink_callback *cb)
2084 {
2085 struct netlink_ext_ack *extack = cb->extack;
2086 struct nlattr *tb[RTA_MAX + 1];
2087 struct rtmsg *rtm;
2088 int err, i;
2089
2090 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2091 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2092 return -EINVAL;
2093 }
2094
2095 rtm = nlmsg_data(nlh);
2096 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
2097 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2098 rtm->rtm_flags) {
2099 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2100 return -EINVAL;
2101 }
2102
2103 if (rtm->rtm_protocol) {
2104 filter->protocol = rtm->rtm_protocol;
2105 filter->filter_set = 1;
2106 cb->answer_flags = NLM_F_DUMP_FILTERED;
2107 }
2108
2109 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2110 rtm_mpls_policy, extack);
2111 if (err < 0)
2112 return err;
2113
2114 for (i = 0; i <= RTA_MAX; ++i) {
2115 int ifindex;
2116
2117 if (i == RTA_OIF) {
2118 ifindex = nla_get_u32(tb[i]);
2119 filter->dev = __dev_get_by_index(net, ifindex);
2120 if (!filter->dev)
2121 return -ENODEV;
2122 filter->filter_set = 1;
2123 } else if (tb[i]) {
2124 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2125 return -EINVAL;
2126 }
2127 }
2128
2129 return 0;
2130 }
2131 #endif
2132
2133 static bool mpls_rt_uses_dev(struct mpls_route *rt,
2134 const struct net_device *dev)
2135 {
2136 struct net_device *nh_dev;
2137
2138 if (rt->rt_nhn == 1) {
2139 struct mpls_nh *nh = rt->rt_nh;
2140
2141 nh_dev = rtnl_dereference(nh->nh_dev);
2142 if (dev == nh_dev)
2143 return true;
2144 } else {
2145 for_nexthops(rt) {
2146 nh_dev = rtnl_dereference(nh->nh_dev);
2147 if (nh_dev == dev)
2148 return true;
2149 } endfor_nexthops(rt);
2150 }
2151
2152 return false;
2153 }
2154
2155 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2156 {
2157 const struct nlmsghdr *nlh = cb->nlh;
2158 struct net *net = sock_net(skb->sk);
2159 struct mpls_route __rcu **platform_label;
2160 struct fib_dump_filter filter = {};
2161 unsigned int flags = NLM_F_MULTI;
2162 size_t platform_labels;
2163 unsigned int index;
2164
2165 ASSERT_RTNL();
2166
2167 if (cb->strict_check) {
2168 int err;
2169
2170 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
2171 if (err < 0)
2172 return err;
2173
2174
2175
2176
2177 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2178 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2179 filter.flags)
2180 return skb->len;
2181 }
2182
2183 index = cb->args[0];
2184 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2185 index = MPLS_LABEL_FIRST_UNRESERVED;
2186
2187 platform_label = rtnl_dereference(net->mpls.platform_label);
2188 platform_labels = net->mpls.platform_labels;
2189
2190 if (filter.filter_set)
2191 flags |= NLM_F_DUMP_FILTERED;
2192
2193 for (; index < platform_labels; index++) {
2194 struct mpls_route *rt;
2195
2196 rt = rtnl_dereference(platform_label[index]);
2197 if (!rt)
2198 continue;
2199
2200 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2201 (filter.protocol && rt->rt_protocol != filter.protocol))
2202 continue;
2203
2204 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2205 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2206 index, rt, flags) < 0)
2207 break;
2208 }
2209 cb->args[0] = index;
2210
2211 return skb->len;
2212 }
2213
2214 static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2215 {
2216 size_t payload =
2217 NLMSG_ALIGN(sizeof(struct rtmsg))
2218 + nla_total_size(4)
2219 + nla_total_size(1);
2220
2221 if (rt->rt_nhn == 1) {
2222 struct mpls_nh *nh = rt->rt_nh;
2223
2224 if (nh->nh_dev)
2225 payload += nla_total_size(4);
2226 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2227 payload += nla_total_size(2 + nh->nh_via_alen);
2228 if (nh->nh_labels)
2229 payload += nla_total_size(nh->nh_labels * 4);
2230 } else {
2231
2232 size_t nhsize = 0;
2233
2234 for_nexthops(rt) {
2235 if (!rtnl_dereference(nh->nh_dev))
2236 continue;
2237 nhsize += nla_total_size(sizeof(struct rtnexthop));
2238
2239 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2240 nhsize += nla_total_size(2 + nh->nh_via_alen);
2241 if (nh->nh_labels)
2242 nhsize += nla_total_size(nh->nh_labels * 4);
2243 } endfor_nexthops(rt);
2244
2245 payload += nla_total_size(nhsize);
2246 }
2247
2248 return payload;
2249 }
2250
2251 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2252 struct nlmsghdr *nlh, struct net *net, u32 portid,
2253 unsigned int nlm_flags)
2254 {
2255 struct sk_buff *skb;
2256 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2257 int err = -ENOBUFS;
2258
2259 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2260 if (skb == NULL)
2261 goto errout;
2262
2263 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2264 if (err < 0) {
2265
2266 WARN_ON(err == -EMSGSIZE);
2267 kfree_skb(skb);
2268 goto errout;
2269 }
2270 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2271
2272 return;
2273 errout:
2274 if (err < 0)
2275 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2276 }
2277
2278 static int mpls_valid_getroute_req(struct sk_buff *skb,
2279 const struct nlmsghdr *nlh,
2280 struct nlattr **tb,
2281 struct netlink_ext_ack *extack)
2282 {
2283 struct rtmsg *rtm;
2284 int i, err;
2285
2286 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2287 NL_SET_ERR_MSG_MOD(extack,
2288 "Invalid header for get route request");
2289 return -EINVAL;
2290 }
2291
2292 if (!netlink_strict_get_check(skb))
2293 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2294 rtm_mpls_policy, extack);
2295
2296 rtm = nlmsg_data(nlh);
2297 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
2298 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
2299 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
2300 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
2301 return -EINVAL;
2302 }
2303 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
2304 NL_SET_ERR_MSG_MOD(extack,
2305 "Invalid flags for get route request");
2306 return -EINVAL;
2307 }
2308
2309 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2310 rtm_mpls_policy, extack);
2311 if (err)
2312 return err;
2313
2314 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
2315 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
2316 return -EINVAL;
2317 }
2318
2319 for (i = 0; i <= RTA_MAX; i++) {
2320 if (!tb[i])
2321 continue;
2322
2323 switch (i) {
2324 case RTA_DST:
2325 case RTA_NEWDST:
2326 break;
2327 default:
2328 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
2329 return -EINVAL;
2330 }
2331 }
2332
2333 return 0;
2334 }
2335
2336 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2337 struct netlink_ext_ack *extack)
2338 {
2339 struct net *net = sock_net(in_skb->sk);
2340 u32 portid = NETLINK_CB(in_skb).portid;
2341 u32 in_label = LABEL_NOT_SPECIFIED;
2342 struct nlattr *tb[RTA_MAX + 1];
2343 u32 labels[MAX_NEW_LABELS];
2344 struct mpls_shim_hdr *hdr;
2345 unsigned int hdr_size = 0;
2346 struct net_device *dev;
2347 struct mpls_route *rt;
2348 struct rtmsg *rtm, *r;
2349 struct nlmsghdr *nlh;
2350 struct sk_buff *skb;
2351 struct mpls_nh *nh;
2352 u8 n_labels;
2353 int err;
2354
2355 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack);
2356 if (err < 0)
2357 goto errout;
2358
2359 rtm = nlmsg_data(in_nlh);
2360
2361 if (tb[RTA_DST]) {
2362 u8 label_count;
2363
2364 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2365 &in_label, extack)) {
2366 err = -EINVAL;
2367 goto errout;
2368 }
2369
2370 if (!mpls_label_ok(net, &in_label, extack)) {
2371 err = -EINVAL;
2372 goto errout;
2373 }
2374 }
2375
2376 rt = mpls_route_input_rcu(net, in_label);
2377 if (!rt) {
2378 err = -ENETUNREACH;
2379 goto errout;
2380 }
2381
2382 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2383 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2384 if (!skb) {
2385 err = -ENOBUFS;
2386 goto errout;
2387 }
2388
2389 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2390 RTM_NEWROUTE, in_label, rt, 0);
2391 if (err < 0) {
2392
2393 WARN_ON(err == -EMSGSIZE);
2394 goto errout_free;
2395 }
2396
2397 return rtnl_unicast(skb, net, portid);
2398 }
2399
2400 if (tb[RTA_NEWDST]) {
2401 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2402 labels, extack) != 0) {
2403 err = -EINVAL;
2404 goto errout;
2405 }
2406
2407 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2408 }
2409
2410 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2411 if (!skb) {
2412 err = -ENOBUFS;
2413 goto errout;
2414 }
2415
2416 skb->protocol = htons(ETH_P_MPLS_UC);
2417
2418 if (hdr_size) {
2419 bool bos;
2420 int i;
2421
2422 if (skb_cow(skb, hdr_size)) {
2423 err = -ENOBUFS;
2424 goto errout_free;
2425 }
2426
2427 skb_reserve(skb, hdr_size);
2428 skb_push(skb, hdr_size);
2429 skb_reset_network_header(skb);
2430
2431
2432 hdr = mpls_hdr(skb);
2433 bos = true;
2434 for (i = n_labels - 1; i >= 0; i--) {
2435 hdr[i] = mpls_entry_encode(labels[i],
2436 1, 0, bos);
2437 bos = false;
2438 }
2439 }
2440
2441 nh = mpls_select_multipath(rt, skb);
2442 if (!nh) {
2443 err = -ENETUNREACH;
2444 goto errout_free;
2445 }
2446
2447 if (hdr_size) {
2448 skb_pull(skb, hdr_size);
2449 skb_reset_network_header(skb);
2450 }
2451
2452 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2453 RTM_NEWROUTE, sizeof(*r), 0);
2454 if (!nlh) {
2455 err = -EMSGSIZE;
2456 goto errout_free;
2457 }
2458
2459 r = nlmsg_data(nlh);
2460 r->rtm_family = AF_MPLS;
2461 r->rtm_dst_len = 20;
2462 r->rtm_src_len = 0;
2463 r->rtm_table = RT_TABLE_MAIN;
2464 r->rtm_type = RTN_UNICAST;
2465 r->rtm_scope = RT_SCOPE_UNIVERSE;
2466 r->rtm_protocol = rt->rt_protocol;
2467 r->rtm_flags = 0;
2468
2469 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2470 goto nla_put_failure;
2471
2472 if (nh->nh_labels &&
2473 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2474 nh->nh_label))
2475 goto nla_put_failure;
2476
2477 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2478 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2479 nh->nh_via_alen))
2480 goto nla_put_failure;
2481 dev = rtnl_dereference(nh->nh_dev);
2482 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2483 goto nla_put_failure;
2484
2485 nlmsg_end(skb, nlh);
2486
2487 err = rtnl_unicast(skb, net, portid);
2488 errout:
2489 return err;
2490
2491 nla_put_failure:
2492 nlmsg_cancel(skb, nlh);
2493 err = -EMSGSIZE;
2494 errout_free:
2495 kfree_skb(skb);
2496 return err;
2497 }
2498
2499 static int resize_platform_label_table(struct net *net, size_t limit)
2500 {
2501 size_t size = sizeof(struct mpls_route *) * limit;
2502 size_t old_limit;
2503 size_t cp_size;
2504 struct mpls_route __rcu **labels = NULL, **old;
2505 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2506 unsigned index;
2507
2508 if (size) {
2509 labels = kvzalloc(size, GFP_KERNEL);
2510 if (!labels)
2511 goto nolabels;
2512 }
2513
2514
2515 if (limit > MPLS_LABEL_IPV4NULL) {
2516 struct net_device *lo = net->loopback_dev;
2517 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2518 if (IS_ERR(rt0))
2519 goto nort0;
2520 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
2521 rt0->rt_protocol = RTPROT_KERNEL;
2522 rt0->rt_payload_type = MPT_IPV4;
2523 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2524 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2525 rt0->rt_nh->nh_via_alen = lo->addr_len;
2526 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2527 lo->addr_len);
2528 }
2529 if (limit > MPLS_LABEL_IPV6NULL) {
2530 struct net_device *lo = net->loopback_dev;
2531 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2532 if (IS_ERR(rt2))
2533 goto nort2;
2534 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
2535 rt2->rt_protocol = RTPROT_KERNEL;
2536 rt2->rt_payload_type = MPT_IPV6;
2537 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2538 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2539 rt2->rt_nh->nh_via_alen = lo->addr_len;
2540 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2541 lo->addr_len);
2542 }
2543
2544 rtnl_lock();
2545
2546 old = rtnl_dereference(net->mpls.platform_label);
2547 old_limit = net->mpls.platform_labels;
2548
2549
2550 for (index = limit; index < old_limit; index++)
2551 mpls_route_update(net, index, NULL, NULL);
2552
2553
2554 cp_size = size;
2555 if (old_limit < limit)
2556 cp_size = old_limit * sizeof(struct mpls_route *);
2557
2558 memcpy(labels, old, cp_size);
2559
2560
2561 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2562 (limit > MPLS_LABEL_IPV6NULL)) {
2563 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2564 rt2 = NULL;
2565 }
2566
2567 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2568 (limit > MPLS_LABEL_IPV4NULL)) {
2569 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2570 rt0 = NULL;
2571 }
2572
2573
2574 net->mpls.platform_labels = limit;
2575 rcu_assign_pointer(net->mpls.platform_label, labels);
2576
2577 rtnl_unlock();
2578
2579 mpls_rt_free(rt2);
2580 mpls_rt_free(rt0);
2581
2582 if (old) {
2583 synchronize_rcu();
2584 kvfree(old);
2585 }
2586 return 0;
2587
2588 nort2:
2589 mpls_rt_free(rt0);
2590 nort0:
2591 kvfree(labels);
2592 nolabels:
2593 return -ENOMEM;
2594 }
2595
2596 static int mpls_platform_labels(struct ctl_table *table, int write,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599 struct net *net = table->data;
2600 int platform_labels = net->mpls.platform_labels;
2601 int ret;
2602 struct ctl_table tmp = {
2603 .procname = table->procname,
2604 .data = &platform_labels,
2605 .maxlen = sizeof(int),
2606 .mode = table->mode,
2607 .extra1 = SYSCTL_ZERO,
2608 .extra2 = &label_limit,
2609 };
2610
2611 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2612
2613 if (write && ret == 0)
2614 ret = resize_platform_label_table(net, platform_labels);
2615
2616 return ret;
2617 }
2618
2619 #define MPLS_NS_SYSCTL_OFFSET(field) \
2620 (&((struct net *)0)->field)
2621
2622 static const struct ctl_table mpls_table[] = {
2623 {
2624 .procname = "platform_labels",
2625 .data = NULL,
2626 .maxlen = sizeof(int),
2627 .mode = 0644,
2628 .proc_handler = mpls_platform_labels,
2629 },
2630 {
2631 .procname = "ip_ttl_propagate",
2632 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2633 .maxlen = sizeof(int),
2634 .mode = 0644,
2635 .proc_handler = proc_dointvec_minmax,
2636 .extra1 = SYSCTL_ZERO,
2637 .extra2 = SYSCTL_ONE,
2638 },
2639 {
2640 .procname = "default_ttl",
2641 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2642 .maxlen = sizeof(int),
2643 .mode = 0644,
2644 .proc_handler = proc_dointvec_minmax,
2645 .extra1 = SYSCTL_ONE,
2646 .extra2 = &ttl_max,
2647 },
2648 { }
2649 };
2650
2651 static int mpls_net_init(struct net *net)
2652 {
2653 struct ctl_table *table;
2654 int i;
2655
2656 net->mpls.platform_labels = 0;
2657 net->mpls.platform_label = NULL;
2658 net->mpls.ip_ttl_propagate = 1;
2659 net->mpls.default_ttl = 255;
2660
2661 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2662 if (table == NULL)
2663 return -ENOMEM;
2664
2665
2666
2667
2668 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2669 table[i].data = (char *)net + (uintptr_t)table[i].data;
2670
2671 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
2672 if (net->mpls.ctl == NULL) {
2673 kfree(table);
2674 return -ENOMEM;
2675 }
2676
2677 return 0;
2678 }
2679
2680 static void mpls_net_exit(struct net *net)
2681 {
2682 struct mpls_route __rcu **platform_label;
2683 size_t platform_labels;
2684 struct ctl_table *table;
2685 unsigned int index;
2686
2687 table = net->mpls.ctl->ctl_table_arg;
2688 unregister_net_sysctl_table(net->mpls.ctl);
2689 kfree(table);
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700 rtnl_lock();
2701 platform_label = rtnl_dereference(net->mpls.platform_label);
2702 platform_labels = net->mpls.platform_labels;
2703 for (index = 0; index < platform_labels; index++) {
2704 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2705 RCU_INIT_POINTER(platform_label[index], NULL);
2706 mpls_notify_route(net, index, rt, NULL, NULL);
2707 mpls_rt_free(rt);
2708 }
2709 rtnl_unlock();
2710
2711 kvfree(platform_label);
2712 }
2713
2714 static struct pernet_operations mpls_net_ops = {
2715 .init = mpls_net_init,
2716 .exit = mpls_net_exit,
2717 };
2718
2719 static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2720 .family = AF_MPLS,
2721 .fill_stats_af = mpls_fill_stats_af,
2722 .get_stats_af_size = mpls_get_stats_af_size,
2723 };
2724
2725 static int __init mpls_init(void)
2726 {
2727 int err;
2728
2729 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2730
2731 err = register_pernet_subsys(&mpls_net_ops);
2732 if (err)
2733 goto out;
2734
2735 err = register_netdevice_notifier(&mpls_dev_notifier);
2736 if (err)
2737 goto out_unregister_pernet;
2738
2739 dev_add_pack(&mpls_packet_type);
2740
2741 rtnl_af_register(&mpls_af_ops);
2742
2743 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2744 mpls_rtm_newroute, NULL, 0);
2745 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2746 mpls_rtm_delroute, NULL, 0);
2747 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2748 mpls_getroute, mpls_dump_routes, 0);
2749 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2750 mpls_netconf_get_devconf,
2751 mpls_netconf_dump_devconf, 0);
2752 err = ipgre_tunnel_encap_add_mpls_ops();
2753 if (err)
2754 pr_err("Can't add mpls over gre tunnel ops\n");
2755
2756 err = 0;
2757 out:
2758 return err;
2759
2760 out_unregister_pernet:
2761 unregister_pernet_subsys(&mpls_net_ops);
2762 goto out;
2763 }
2764 module_init(mpls_init);
2765
2766 static void __exit mpls_exit(void)
2767 {
2768 rtnl_unregister_all(PF_MPLS);
2769 rtnl_af_unregister(&mpls_af_ops);
2770 dev_remove_pack(&mpls_packet_type);
2771 unregister_netdevice_notifier(&mpls_dev_notifier);
2772 unregister_pernet_subsys(&mpls_net_ops);
2773 ipgre_tunnel_encap_del_mpls_ops();
2774 }
2775 module_exit(mpls_exit);
2776
2777 MODULE_DESCRIPTION("MultiProtocol Label Switching");
2778 MODULE_LICENSE("GPL v2");
2779 MODULE_ALIAS_NETPROTO(PF_MPLS);