?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/tests: hdmi: Fix memory leaks in drm_display_mode_from_cea_vic()
[drm/drm-misc.git] / net / mpls / af_mpls.c
blobdf62638b6498434d5fd8e657f19685f6b08b8074
1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/skbuff.h>
4 #include <linux/socket.h>
5 #include <linux/sysctl.h>
6 #include <linux/net.h>
7 #include <linux/module.h>
8 #include <linux/if_arp.h>
9 #include <linux/ipv6.h>
10 #include <linux/mpls.h>
11 #include <linux/netconf.h>
12 #include <linux/nospec.h>
13 #include <linux/vmalloc.h>
14 #include <linux/percpu.h>
15 #include <net/gso.h>
16 #include <net/ip.h>
17 #include <net/dst.h>
18 #include <net/sock.h>
19 #include <net/arp.h>
20 #include <net/ip_fib.h>
21 #include <net/netevent.h>
22 #include <net/ip_tunnels.h>
23 #include <net/netns/generic.h>
24 #if IS_ENABLED(CONFIG_IPV6)
25 #include <net/ipv6.h>
26 #endif
27 #include <net/ipv6_stubs.h>
28 #include <net/rtnh.h>
29 #include "internal.h"
30
31 /* max memory we will use for mpls_route */
32 #define MAX_MPLS_ROUTE_MEM 4096
33
34 /* Maximum number of labels to look ahead at when selecting a path of
35 * a multipath route
36 */
37 #define MAX_MP_SELECT_LABELS 4
38
39 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
40
41 static int label_limit = (1 << 20) - 1;
42 static int ttl_max = 255;
43
44 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
45 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
46 {
47 return sizeof(struct mpls_shim_hdr);
48 }
49
50 static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
51 .encap_hlen = ipgre_mpls_encap_hlen,
52 };
53
54 static int ipgre_tunnel_encap_add_mpls_ops(void)
55 {
56 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
57 }
58
59 static void ipgre_tunnel_encap_del_mpls_ops(void)
60 {
61 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
62 }
63 #else
64 static int ipgre_tunnel_encap_add_mpls_ops(void)
65 {
66 return 0;
67 }
68
69 static void ipgre_tunnel_encap_del_mpls_ops(void)
70 {
71 }
72 #endif
73
74 static 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
78 static 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
90 bool mpls_output_possible(const struct net_device *dev)
91 {
92 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
93 }
94 EXPORT_SYMBOL_GPL(mpls_output_possible);
95
96 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
97 {
98 return (u8 *)nh + rt->rt_via_offset;
99 }
100
101 static 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
107 static 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
113 unsigned 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 }
118 EXPORT_SYMBOL_GPL(mpls_dev_mtu);
119
120 bool 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 }
130 EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
131
132 void 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 }
155 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
156
157 static 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
224 static 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 */
234 static const 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
266 out:
267 return mpls_get_nexthop(rt, nh_index);
268 }
269
270 static 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
342 static 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 const struct mpls_nh *nh;
348 struct mpls_route *rt;
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 skb_dst_drop(skb);
382
383 /* Read and decode the label */
384 hdr = mpls_hdr(skb);
385 dec = mpls_entry_decode(hdr);
386
387 rt = mpls_route_input_rcu(net, dec.label);
388 if (!rt) {
389 MPLS_INC_STATS(mdev, rx_noroute);
390 goto drop;
391 }
392
393 nh = mpls_select_multipath(rt, skb);
394 if (!nh)
395 goto err;
396
397 /* Pop the label */
398 skb_pull(skb, sizeof(*hdr));
399 skb_reset_network_header(skb);
400
401 skb_orphan(skb);
402
403 if (skb_warn_if_lro(skb))
404 goto err;
405
406 skb_forward_csum(skb);
407
408 /* Verify ttl is valid */
409 if (dec.ttl <= 1)
410 goto err;
411
412 /* Find the output device */
413 out_dev = nh->nh_dev;
414 if (!mpls_output_possible(out_dev))
415 goto tx_err;
416
417 /* Verify the destination can hold the packet */
418 new_header_size = mpls_nh_header_size(nh);
419 mtu = mpls_dev_mtu(out_dev);
420 if (mpls_pkt_too_big(skb, mtu - new_header_size))
421 goto tx_err;
422
423 hh_len = LL_RESERVED_SPACE(out_dev);
424 if (!out_dev->header_ops)
425 hh_len = 0;
426
427 /* Ensure there is enough space for the headers in the skb */
428 if (skb_cow(skb, hh_len + new_header_size))
429 goto tx_err;
430
431 skb->dev = out_dev;
432 skb->protocol = htons(ETH_P_MPLS_UC);
433
434 dec.ttl -= 1;
435 if (unlikely(!new_header_size && dec.bos)) {
436 /* Penultimate hop popping */
437 if (!mpls_egress(dev_net(out_dev), rt, skb, dec))
438 goto err;
439 } else {
440 bool bos;
441 int i;
442 skb_push(skb, new_header_size);
443 skb_reset_network_header(skb);
444 /* Push the new labels */
445 hdr = mpls_hdr(skb);
446 bos = dec.bos;
447 for (i = nh->nh_labels - 1; i >= 0; i--) {
448 hdr[i] = mpls_entry_encode(nh->nh_label[i],
449 dec.ttl, 0, bos);
450 bos = false;
451 }
452 }
453
454 mpls_stats_inc_outucastpkts(out_dev, skb);
455
456 /* If via wasn't specified then send out using device address */
457 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
458 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
459 out_dev->dev_addr, skb);
460 else
461 err = neigh_xmit(nh->nh_via_table, out_dev,
462 mpls_nh_via(rt, nh), skb);
463 if (err)
464 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
465 __func__, err);
466 return 0;
467
468 tx_err:
469 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
470 if (out_mdev)
471 MPLS_INC_STATS(out_mdev, tx_errors);
472 goto drop;
473 err:
474 MPLS_INC_STATS(mdev, rx_errors);
475 drop:
476 kfree_skb(skb);
477 return NET_RX_DROP;
478 }
479
480 static struct packet_type mpls_packet_type __read_mostly = {
481 .type = cpu_to_be16(ETH_P_MPLS_UC),
482 .func = mpls_forward,
483 };
484
485 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
486 [RTA_DST] = { .type = NLA_U32 },
487 [RTA_OIF] = { .type = NLA_U32 },
488 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
489 };
490
491 struct mpls_route_config {
492 u32 rc_protocol;
493 u32 rc_ifindex;
494 u8 rc_via_table;
495 u8 rc_via_alen;
496 u8 rc_via[MAX_VIA_ALEN];
497 u32 rc_label;
498 u8 rc_ttl_propagate;
499 u8 rc_output_labels;
500 u32 rc_output_label[MAX_NEW_LABELS];
501 u32 rc_nlflags;
502 enum mpls_payload_type rc_payload_type;
503 struct nl_info rc_nlinfo;
504 struct rtnexthop *rc_mp;
505 int rc_mp_len;
506 };
507
508 /* all nexthops within a route have the same size based on max
509 * number of labels and max via length for a hop
510 */
511 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
512 {
513 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
514 struct mpls_route *rt;
515 size_t size;
516
517 size = sizeof(*rt) + num_nh * nh_size;
518 if (size > MAX_MPLS_ROUTE_MEM)
519 return ERR_PTR(-EINVAL);
520
521 rt = kzalloc(size, GFP_KERNEL);
522 if (!rt)
523 return ERR_PTR(-ENOMEM);
524
525 rt->rt_nhn = num_nh;
526 rt->rt_nhn_alive = num_nh;
527 rt->rt_nh_size = nh_size;
528 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels);
529
530 return rt;
531 }
532
533 static void mpls_rt_free(struct mpls_route *rt)
534 {
535 if (rt)
536 kfree_rcu(rt, rt_rcu);
537 }
538
539 static void mpls_notify_route(struct net *net, unsigned index,
540 struct mpls_route *old, struct mpls_route *new,
541 const struct nl_info *info)
542 {
543 struct nlmsghdr *nlh = info ? info->nlh : NULL;
544 unsigned portid = info ? info->portid : 0;
545 int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
546 struct mpls_route *rt = new ? new : old;
547 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
548 /* Ignore reserved labels for now */
549 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
550 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
551 }
552
553 static void mpls_route_update(struct net *net, unsigned index,
554 struct mpls_route *new,
555 const struct nl_info *info)
556 {
557 struct mpls_route __rcu **platform_label;
558 struct mpls_route *rt;
559
560 ASSERT_RTNL();
561
562 platform_label = rtnl_dereference(net->mpls.platform_label);
563 rt = rtnl_dereference(platform_label[index]);
564 rcu_assign_pointer(platform_label[index], new);
565
566 mpls_notify_route(net, index, rt, new, info);
567
568 /* If we removed a route free it now */
569 mpls_rt_free(rt);
570 }
571
572 static unsigned find_free_label(struct net *net)
573 {
574 struct mpls_route __rcu **platform_label;
575 size_t platform_labels;
576 unsigned index;
577
578 platform_label = rtnl_dereference(net->mpls.platform_label);
579 platform_labels = net->mpls.platform_labels;
580 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
581 index++) {
582 if (!rtnl_dereference(platform_label[index]))
583 return index;
584 }
585 return LABEL_NOT_SPECIFIED;
586 }
587
588 #if IS_ENABLED(CONFIG_INET)
589 static struct net_device *inet_fib_lookup_dev(struct net *net,
590 const void *addr)
591 {
592 struct net_device *dev;
593 struct rtable *rt;
594 struct in_addr daddr;
595
596 memcpy(&daddr, addr, sizeof(struct in_addr));
597 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0, RT_SCOPE_UNIVERSE);
598 if (IS_ERR(rt))
599 return ERR_CAST(rt);
600
601 dev = rt->dst.dev;
602 dev_hold(dev);
603
604 ip_rt_put(rt);
605
606 return dev;
607 }
608 #else
609 static struct net_device *inet_fib_lookup_dev(struct net *net,
610 const void *addr)
611 {
612 return ERR_PTR(-EAFNOSUPPORT);
613 }
614 #endif
615
616 #if IS_ENABLED(CONFIG_IPV6)
617 static struct net_device *inet6_fib_lookup_dev(struct net *net,
618 const void *addr)
619 {
620 struct net_device *dev;
621 struct dst_entry *dst;
622 struct flowi6 fl6;
623
624 if (!ipv6_stub)
625 return ERR_PTR(-EAFNOSUPPORT);
626
627 memset(&fl6, 0, sizeof(fl6));
628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
629 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
630 if (IS_ERR(dst))
631 return ERR_CAST(dst);
632
633 dev = dst->dev;
634 dev_hold(dev);
635 dst_release(dst);
636
637 return dev;
638 }
639 #else
640 static struct net_device *inet6_fib_lookup_dev(struct net *net,
641 const void *addr)
642 {
643 return ERR_PTR(-EAFNOSUPPORT);
644 }
645 #endif
646
647 static struct net_device *find_outdev(struct net *net,
648 struct mpls_route *rt,
649 struct mpls_nh *nh, int oif)
650 {
651 struct net_device *dev = NULL;
652
653 if (!oif) {
654 switch (nh->nh_via_table) {
655 case NEIGH_ARP_TABLE:
656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
657 break;
658 case NEIGH_ND_TABLE:
659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
660 break;
661 case NEIGH_LINK_TABLE:
662 break;
663 }
664 } else {
665 dev = dev_get_by_index(net, oif);
666 }
667
668 if (!dev)
669 return ERR_PTR(-ENODEV);
670
671 if (IS_ERR(dev))
672 return dev;
673
674 /* The caller is holding rtnl anyways, so release the dev reference */
675 dev_put(dev);
676
677 return dev;
678 }
679
680 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
681 struct mpls_nh *nh, int oif)
682 {
683 struct net_device *dev = NULL;
684 int err = -ENODEV;
685
686 dev = find_outdev(net, rt, nh, oif);
687 if (IS_ERR(dev)) {
688 err = PTR_ERR(dev);
689 dev = NULL;
690 goto errout;
691 }
692
693 /* Ensure this is a supported device */
694 err = -EINVAL;
695 if (!mpls_dev_get(dev))
696 goto errout;
697
698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
699 (dev->addr_len != nh->nh_via_alen))
700 goto errout;
701
702 nh->nh_dev = dev;
703
704 if (!(dev->flags & IFF_UP)) {
705 nh->nh_flags |= RTNH_F_DEAD;
706 } else {
707 unsigned int flags;
708
709 flags = dev_get_flags(dev);
710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
711 nh->nh_flags |= RTNH_F_LINKDOWN;
712 }
713
714 return 0;
715
716 errout:
717 return err;
718 }
719
720 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
721 u8 via_addr[], struct netlink_ext_ack *extack)
722 {
723 struct rtvia *via = nla_data(nla);
724 int err = -EINVAL;
725 int alen;
726
727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
728 NL_SET_ERR_MSG_ATTR(extack, nla,
729 "Invalid attribute length for RTA_VIA");
730 goto errout;
731 }
732 alen = nla_len(nla) -
733 offsetof(struct rtvia, rtvia_addr);
734 if (alen > MAX_VIA_ALEN) {
735 NL_SET_ERR_MSG_ATTR(extack, nla,
736 "Invalid address length for RTA_VIA");
737 goto errout;
738 }
739
740 /* Validate the address family */
741 switch (via->rtvia_family) {
742 case AF_PACKET:
743 *via_table = NEIGH_LINK_TABLE;
744 break;
745 case AF_INET:
746 *via_table = NEIGH_ARP_TABLE;
747 if (alen != 4)
748 goto errout;
749 break;
750 case AF_INET6:
751 *via_table = NEIGH_ND_TABLE;
752 if (alen != 16)
753 goto errout;
754 break;
755 default:
756 /* Unsupported address family */
757 goto errout;
758 }
759
760 memcpy(via_addr, via->rtvia_addr, alen);
761 *via_alen = alen;
762 err = 0;
763
764 errout:
765 return err;
766 }
767
768 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
769 struct mpls_route *rt)
770 {
771 struct net *net = cfg->rc_nlinfo.nl_net;
772 struct mpls_nh *nh = rt->rt_nh;
773 int err;
774 int i;
775
776 if (!nh)
777 return -ENOMEM;
778
779 nh->nh_labels = cfg->rc_output_labels;
780 for (i = 0; i < nh->nh_labels; i++)
781 nh->nh_label[i] = cfg->rc_output_label[i];
782
783 nh->nh_via_table = cfg->rc_via_table;
784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
785 nh->nh_via_alen = cfg->rc_via_alen;
786
787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
788 if (err)
789 goto errout;
790
791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
792 rt->rt_nhn_alive--;
793
794 return 0;
795
796 errout:
797 return err;
798 }
799
800 static int mpls_nh_build(struct net *net, struct mpls_route *rt,
801 struct mpls_nh *nh, int oif, struct nlattr *via,
802 struct nlattr *newdst, u8 max_labels,
803 struct netlink_ext_ack *extack)
804 {
805 int err = -ENOMEM;
806
807 if (!nh)
808 goto errout;
809
810 if (newdst) {
811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
812 nh->nh_label, extack);
813 if (err)
814 goto errout;
815 }
816
817 if (via) {
818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
819 __mpls_nh_via(rt, nh), extack);
820 if (err)
821 goto errout;
822 } else {
823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
824 }
825
826 err = mpls_nh_assign_dev(net, rt, nh, oif);
827 if (err)
828 goto errout;
829
830 return 0;
831
832 errout:
833 return err;
834 }
835
836 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
837 u8 cfg_via_alen, u8 *max_via_alen,
838 u8 *max_labels)
839 {
840 int remaining = len;
841 u8 nhs = 0;
842
843 *max_via_alen = 0;
844 *max_labels = 0;
845
846 while (rtnh_ok(rtnh, remaining)) {
847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
848 int attrlen;
849 u8 n_labels = 0;
850
851 attrlen = rtnh_attrlen(rtnh);
852 nla = nla_find(attrs, attrlen, RTA_VIA);
853 if (nla && nla_len(nla) >=
854 offsetof(struct rtvia, rtvia_addr)) {
855 int via_alen = nla_len(nla) -
856 offsetof(struct rtvia, rtvia_addr);
857
858 if (via_alen <= MAX_VIA_ALEN)
859 *max_via_alen = max_t(u16, *max_via_alen,
860 via_alen);
861 }
862
863 nla = nla_find(attrs, attrlen, RTA_NEWDST);
864 if (nla &&
865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
866 NULL, NULL) != 0)
867 return 0;
868
869 *max_labels = max_t(u8, *max_labels, n_labels);
870
871 /* number of nexthops is tracked by a u8.
872 * Check for overflow.
873 */
874 if (nhs == 255)
875 return 0;
876 nhs++;
877
878 rtnh = rtnh_next(rtnh, &remaining);
879 }
880
881 /* leftover implies invalid nexthop configuration, discard it */
882 return remaining > 0 ? 0 : nhs;
883 }
884
885 static int mpls_nh_build_multi(struct mpls_route_config *cfg,
886 struct mpls_route *rt, u8 max_labels,
887 struct netlink_ext_ack *extack)
888 {
889 struct rtnexthop *rtnh = cfg->rc_mp;
890 struct nlattr *nla_via, *nla_newdst;
891 int remaining = cfg->rc_mp_len;
892 int err = 0;
893 u8 nhs = 0;
894
895 change_nexthops(rt) {
896 int attrlen;
897
898 nla_via = NULL;
899 nla_newdst = NULL;
900
901 err = -EINVAL;
902 if (!rtnh_ok(rtnh, remaining))
903 goto errout;
904
905 /* neither weighted multipath nor any flags
906 * are supported
907 */
908 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
909 goto errout;
910
911 attrlen = rtnh_attrlen(rtnh);
912 if (attrlen > 0) {
913 struct nlattr *attrs = rtnh_attrs(rtnh);
914
915 nla_via = nla_find(attrs, attrlen, RTA_VIA);
916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
917 }
918
919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
920 rtnh->rtnh_ifindex, nla_via, nla_newdst,
921 max_labels, extack);
922 if (err)
923 goto errout;
924
925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
926 rt->rt_nhn_alive--;
927
928 rtnh = rtnh_next(rtnh, &remaining);
929 nhs++;
930 } endfor_nexthops(rt);
931
932 rt->rt_nhn = nhs;
933
934 return 0;
935
936 errout:
937 return err;
938 }
939
940 static bool mpls_label_ok(struct net *net, unsigned int *index,
941 struct netlink_ext_ack *extack)
942 {
943 bool is_ok = true;
944
945 /* Reserved labels may not be set */
946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
947 NL_SET_ERR_MSG(extack,
948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
949 is_ok = false;
950 }
951
952 /* The full 20 bit range may not be supported. */
953 if (is_ok && *index >= net->mpls.platform_labels) {
954 NL_SET_ERR_MSG(extack,
955 "Label >= configured maximum in platform_labels");
956 is_ok = false;
957 }
958
959 *index = array_index_nospec(*index, net->mpls.platform_labels);
960 return is_ok;
961 }
962
963 static int mpls_route_add(struct mpls_route_config *cfg,
964 struct netlink_ext_ack *extack)
965 {
966 struct mpls_route __rcu **platform_label;
967 struct net *net = cfg->rc_nlinfo.nl_net;
968 struct mpls_route *rt, *old;
969 int err = -EINVAL;
970 u8 max_via_alen;
971 unsigned index;
972 u8 max_labels;
973 u8 nhs;
974
975 index = cfg->rc_label;
976
977 /* If a label was not specified during insert pick one */
978 if ((index == LABEL_NOT_SPECIFIED) &&
979 (cfg->rc_nlflags & NLM_F_CREATE)) {
980 index = find_free_label(net);
981 }
982
983 if (!mpls_label_ok(net, &index, extack))
984 goto errout;
985
986 /* Append makes no sense with mpls */
987 err = -EOPNOTSUPP;
988 if (cfg->rc_nlflags & NLM_F_APPEND) {
989 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
990 goto errout;
991 }
992
993 err = -EEXIST;
994 platform_label = rtnl_dereference(net->mpls.platform_label);
995 old = rtnl_dereference(platform_label[index]);
996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
997 goto errout;
998
999 err = -EEXIST;
1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
1001 goto errout;
1002
1003 err = -ENOENT;
1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1005 goto errout;
1006
1007 err = -EINVAL;
1008 if (cfg->rc_mp) {
1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1010 cfg->rc_via_alen, &max_via_alen,
1011 &max_labels);
1012 } else {
1013 max_via_alen = cfg->rc_via_alen;
1014 max_labels = cfg->rc_output_labels;
1015 nhs = 1;
1016 }
1017
1018 if (nhs == 0) {
1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
1020 goto errout;
1021 }
1022
1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
1024 if (IS_ERR(rt)) {
1025 err = PTR_ERR(rt);
1026 goto errout;
1027 }
1028
1029 rt->rt_protocol = cfg->rc_protocol;
1030 rt->rt_payload_type = cfg->rc_payload_type;
1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
1032
1033 if (cfg->rc_mp)
1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
1035 else
1036 err = mpls_nh_build_from_cfg(cfg, rt);
1037 if (err)
1038 goto freert;
1039
1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
1041
1042 return 0;
1043
1044 freert:
1045 mpls_rt_free(rt);
1046 errout:
1047 return err;
1048 }
1049
1050 static int mpls_route_del(struct mpls_route_config *cfg,
1051 struct netlink_ext_ack *extack)
1052 {
1053 struct net *net = cfg->rc_nlinfo.nl_net;
1054 unsigned index;
1055 int err = -EINVAL;
1056
1057 index = cfg->rc_label;
1058
1059 if (!mpls_label_ok(net, &index, extack))
1060 goto errout;
1061
1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
1063
1064 err = 0;
1065 errout:
1066 return err;
1067 }
1068
1069 static void mpls_get_stats(struct mpls_dev *mdev,
1070 struct mpls_link_stats *stats)
1071 {
1072 struct mpls_pcpu_stats *p;
1073 int i;
1074
1075 memset(stats, 0, sizeof(*stats));
1076
1077 for_each_possible_cpu(i) {
1078 struct mpls_link_stats local;
1079 unsigned int start;
1080
1081 p = per_cpu_ptr(mdev->stats, i);
1082 do {
1083 start = u64_stats_fetch_begin(&p->syncp);
1084 local = p->stats;
1085 } while (u64_stats_fetch_retry(&p->syncp, start));
1086
1087 stats->rx_packets += local.rx_packets;
1088 stats->rx_bytes += local.rx_bytes;
1089 stats->tx_packets += local.tx_packets;
1090 stats->tx_bytes += local.tx_bytes;
1091 stats->rx_errors += local.rx_errors;
1092 stats->tx_errors += local.tx_errors;
1093 stats->rx_dropped += local.rx_dropped;
1094 stats->tx_dropped += local.tx_dropped;
1095 stats->rx_noroute += local.rx_noroute;
1096 }
1097 }
1098
1099 static int mpls_fill_stats_af(struct sk_buff *skb,
1100 const struct net_device *dev)
1101 {
1102 struct mpls_link_stats *stats;
1103 struct mpls_dev *mdev;
1104 struct nlattr *nla;
1105
1106 mdev = mpls_dev_get(dev);
1107 if (!mdev)
1108 return -ENODATA;
1109
1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1111 sizeof(struct mpls_link_stats),
1112 MPLS_STATS_UNSPEC);
1113 if (!nla)
1114 return -EMSGSIZE;
1115
1116 stats = nla_data(nla);
1117 mpls_get_stats(mdev, stats);
1118
1119 return 0;
1120 }
1121
1122 static size_t mpls_get_stats_af_size(const struct net_device *dev)
1123 {
1124 struct mpls_dev *mdev;
1125
1126 mdev = mpls_dev_get(dev);
1127 if (!mdev)
1128 return 0;
1129
1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1131 }
1132
1133 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1134 u32 portid, u32 seq, int event,
1135 unsigned int flags, int type)
1136 {
1137 struct nlmsghdr *nlh;
1138 struct netconfmsg *ncm;
1139 bool all = false;
1140
1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1142 flags);
1143 if (!nlh)
1144 return -EMSGSIZE;
1145
1146 if (type == NETCONFA_ALL)
1147 all = true;
1148
1149 ncm = nlmsg_data(nlh);
1150 ncm->ncm_family = AF_MPLS;
1151
1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1153 goto nla_put_failure;
1154
1155 if ((all || type == NETCONFA_INPUT) &&
1156 nla_put_s32(skb, NETCONFA_INPUT,
1157 READ_ONCE(mdev->input_enabled)) < 0)
1158 goto nla_put_failure;
1159
1160 nlmsg_end(skb, nlh);
1161 return 0;
1162
1163 nla_put_failure:
1164 nlmsg_cancel(skb, nlh);
1165 return -EMSGSIZE;
1166 }
1167
1168 static int mpls_netconf_msgsize_devconf(int type)
1169 {
1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1171 + nla_total_size(4); /* NETCONFA_IFINDEX */
1172 bool all = false;
1173
1174 if (type == NETCONFA_ALL)
1175 all = true;
1176
1177 if (all || type == NETCONFA_INPUT)
1178 size += nla_total_size(4);
1179
1180 return size;
1181 }
1182
1183 static void mpls_netconf_notify_devconf(struct net *net, int event,
1184 int type, struct mpls_dev *mdev)
1185 {
1186 struct sk_buff *skb;
1187 int err = -ENOBUFS;
1188
1189 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
1190 if (!skb)
1191 goto errout;
1192
1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
1194 if (err < 0) {
1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1196 WARN_ON(err == -EMSGSIZE);
1197 kfree_skb(skb);
1198 goto errout;
1199 }
1200
1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1202 return;
1203 errout:
1204 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1205 }
1206
1207 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1208 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1209 };
1210
1211 static int mpls_netconf_valid_get_req(struct sk_buff *skb,
1212 const struct nlmsghdr *nlh,
1213 struct nlattr **tb,
1214 struct netlink_ext_ack *extack)
1215 {
1216 int i, err;
1217
1218 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
1219 NL_SET_ERR_MSG_MOD(extack,
1220 "Invalid header for netconf get request");
1221 return -EINVAL;
1222 }
1223
1224 if (!netlink_strict_get_check(skb))
1225 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
1226 tb, NETCONFA_MAX,
1227 devconf_mpls_policy, extack);
1228
1229 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
1230 tb, NETCONFA_MAX,
1231 devconf_mpls_policy, extack);
1232 if (err)
1233 return err;
1234
1235 for (i = 0; i <= NETCONFA_MAX; i++) {
1236 if (!tb[i])
1237 continue;
1238
1239 switch (i) {
1240 case NETCONFA_IFINDEX:
1241 break;
1242 default:
1243 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
1244 return -EINVAL;
1245 }
1246 }
1247
1248 return 0;
1249 }
1250
1251 static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
1252 struct nlmsghdr *nlh,
1253 struct netlink_ext_ack *extack)
1254 {
1255 struct net *net = sock_net(in_skb->sk);
1256 struct nlattr *tb[NETCONFA_MAX + 1];
1257 struct net_device *dev;
1258 struct mpls_dev *mdev;
1259 struct sk_buff *skb;
1260 int ifindex;
1261 int err;
1262
1263 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
1264 if (err < 0)
1265 goto errout;
1266
1267 err = -EINVAL;
1268 if (!tb[NETCONFA_IFINDEX])
1269 goto errout;
1270
1271 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1272 dev = __dev_get_by_index(net, ifindex);
1273 if (!dev)
1274 goto errout;
1275
1276 mdev = mpls_dev_get(dev);
1277 if (!mdev)
1278 goto errout;
1279
1280 err = -ENOBUFS;
1281 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1282 if (!skb)
1283 goto errout;
1284
1285 err = mpls_netconf_fill_devconf(skb, mdev,
1286 NETLINK_CB(in_skb).portid,
1287 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1288 NETCONFA_ALL);
1289 if (err < 0) {
1290 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1291 WARN_ON(err == -EMSGSIZE);
1292 kfree_skb(skb);
1293 goto errout;
1294 }
1295 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1296 errout:
1297 return err;
1298 }
1299
1300 static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1301 struct netlink_callback *cb)
1302 {
1303 const struct nlmsghdr *nlh = cb->nlh;
1304 struct net *net = sock_net(skb->sk);
1305 struct {
1306 unsigned long ifindex;
1307 } *ctx = (void *)cb->ctx;
1308 struct net_device *dev;
1309 struct mpls_dev *mdev;
1310 int err = 0;
1311
1312 if (cb->strict_check) {
1313 struct netlink_ext_ack *extack = cb->extack;
1314 struct netconfmsg *ncm;
1315
1316 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1317 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1318 return -EINVAL;
1319 }
1320
1321 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1322 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1323 return -EINVAL;
1324 }
1325 }
1326
1327 rcu_read_lock();
1328 for_each_netdev_dump(net, dev, ctx->ifindex) {
1329 mdev = mpls_dev_get(dev);
1330 if (!mdev)
1331 continue;
1332 err = mpls_netconf_fill_devconf(skb, mdev,
1333 NETLINK_CB(cb->skb).portid,
1334 nlh->nlmsg_seq,
1335 RTM_NEWNETCONF,
1336 NLM_F_MULTI,
1337 NETCONFA_ALL);
1338 if (err < 0)
1339 break;
1340 }
1341 rcu_read_unlock();
1342
1343 return err;
1344 }
1345
1346 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1347 (&((struct mpls_dev *)0)->field)
1348
1349 static int mpls_conf_proc(const struct ctl_table *ctl, int write,
1350 void *buffer, size_t *lenp, loff_t *ppos)
1351 {
1352 int oval = *(int *)ctl->data;
1353 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1354
1355 if (write) {
1356 struct mpls_dev *mdev = ctl->extra1;
1357 int i = (int *)ctl->data - (int *)mdev;
1358 struct net *net = ctl->extra2;
1359 int val = *(int *)ctl->data;
1360
1361 if (i == offsetof(struct mpls_dev, input_enabled) &&
1362 val != oval) {
1363 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1364 NETCONFA_INPUT, mdev);
1365 }
1366 }
1367
1368 return ret;
1369 }
1370
1371 static const struct ctl_table mpls_dev_table[] = {
1372 {
1373 .procname = "input",
1374 .maxlen = sizeof(int),
1375 .mode = 0644,
1376 .proc_handler = mpls_conf_proc,
1377 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1378 },
1379 };
1380
1381 static int mpls_dev_sysctl_register(struct net_device *dev,
1382 struct mpls_dev *mdev)
1383 {
1384 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
1385 size_t table_size = ARRAY_SIZE(mpls_dev_table);
1386 struct net *net = dev_net(dev);
1387 struct ctl_table *table;
1388 int i;
1389
1390 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1391 if (!table)
1392 goto out;
1393
1394 /* Table data contains only offsets relative to the base of
1395 * the mdev at this point, so make them absolute.
1396 */
1397 for (i = 0; i < table_size; i++) {
1398 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
1399 table[i].extra1 = mdev;
1400 table[i].extra2 = net;
1401 }
1402
1403 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1404
1405 mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size);
1406 if (!mdev->sysctl)
1407 goto free;
1408
1409 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
1410 return 0;
1411
1412 free:
1413 kfree(table);
1414 out:
1415 mdev->sysctl = NULL;
1416 return -ENOBUFS;
1417 }
1418
1419 static void mpls_dev_sysctl_unregister(struct net_device *dev,
1420 struct mpls_dev *mdev)
1421 {
1422 struct net *net = dev_net(dev);
1423 const struct ctl_table *table;
1424
1425 if (!mdev->sysctl)
1426 return;
1427
1428 table = mdev->sysctl->ctl_table_arg;
1429 unregister_net_sysctl_table(mdev->sysctl);
1430 kfree(table);
1431
1432 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
1433 }
1434
1435 static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1436 {
1437 struct mpls_dev *mdev;
1438 int err = -ENOMEM;
1439 int i;
1440
1441 ASSERT_RTNL();
1442
1443 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1444 if (!mdev)
1445 return ERR_PTR(err);
1446
1447 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1448 if (!mdev->stats)
1449 goto free;
1450
1451 for_each_possible_cpu(i) {
1452 struct mpls_pcpu_stats *mpls_stats;
1453
1454 mpls_stats = per_cpu_ptr(mdev->stats, i);
1455 u64_stats_init(&mpls_stats->syncp);
1456 }
1457
1458 mdev->dev = dev;
1459
1460 err = mpls_dev_sysctl_register(dev, mdev);
1461 if (err)
1462 goto free;
1463
1464 rcu_assign_pointer(dev->mpls_ptr, mdev);
1465
1466 return mdev;
1467
1468 free:
1469 free_percpu(mdev->stats);
1470 kfree(mdev);
1471 return ERR_PTR(err);
1472 }
1473
1474 static void mpls_dev_destroy_rcu(struct rcu_head *head)
1475 {
1476 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1477
1478 free_percpu(mdev->stats);
1479 kfree(mdev);
1480 }
1481
1482 static int mpls_ifdown(struct net_device *dev, int event)
1483 {
1484 struct mpls_route __rcu **platform_label;
1485 struct net *net = dev_net(dev);
1486 unsigned index;
1487
1488 platform_label = rtnl_dereference(net->mpls.platform_label);
1489 for (index = 0; index < net->mpls.platform_labels; index++) {
1490 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1491 bool nh_del = false;
1492 u8 alive = 0;
1493
1494 if (!rt)
1495 continue;
1496
1497 if (event == NETDEV_UNREGISTER) {
1498 u8 deleted = 0;
1499
1500 for_nexthops(rt) {
1501 if (!nh->nh_dev || nh->nh_dev == dev)
1502 deleted++;
1503 if (nh->nh_dev == dev)
1504 nh_del = true;
1505 } endfor_nexthops(rt);
1506
1507 /* if there are no more nexthops, delete the route */
1508 if (deleted == rt->rt_nhn) {
1509 mpls_route_update(net, index, NULL, NULL);
1510 continue;
1511 }
1512
1513 if (nh_del) {
1514 size_t size = sizeof(*rt) + rt->rt_nhn *
1515 rt->rt_nh_size;
1516 struct mpls_route *orig = rt;
1517
1518 rt = kmemdup(orig, size, GFP_KERNEL);
1519 if (!rt)
1520 return -ENOMEM;
1521 }
1522 }
1523
1524 change_nexthops(rt) {
1525 unsigned int nh_flags = nh->nh_flags;
1526
1527 if (nh->nh_dev != dev)
1528 goto next;
1529
1530 switch (event) {
1531 case NETDEV_DOWN:
1532 case NETDEV_UNREGISTER:
1533 nh_flags |= RTNH_F_DEAD;
1534 fallthrough;
1535 case NETDEV_CHANGE:
1536 nh_flags |= RTNH_F_LINKDOWN;
1537 break;
1538 }
1539 if (event == NETDEV_UNREGISTER)
1540 nh->nh_dev = NULL;
1541
1542 if (nh->nh_flags != nh_flags)
1543 WRITE_ONCE(nh->nh_flags, nh_flags);
1544 next:
1545 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
1546 alive++;
1547 } endfor_nexthops(rt);
1548
1549 WRITE_ONCE(rt->rt_nhn_alive, alive);
1550
1551 if (nh_del)
1552 mpls_route_update(net, index, rt, NULL);
1553 }
1554
1555 return 0;
1556 }
1557
1558 static void mpls_ifup(struct net_device *dev, unsigned int flags)
1559 {
1560 struct mpls_route __rcu **platform_label;
1561 struct net *net = dev_net(dev);
1562 unsigned index;
1563 u8 alive;
1564
1565 platform_label = rtnl_dereference(net->mpls.platform_label);
1566 for (index = 0; index < net->mpls.platform_labels; index++) {
1567 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1568
1569 if (!rt)
1570 continue;
1571
1572 alive = 0;
1573 change_nexthops(rt) {
1574 unsigned int nh_flags = nh->nh_flags;
1575
1576 if (!(nh_flags & flags)) {
1577 alive++;
1578 continue;
1579 }
1580 if (nh->nh_dev != dev)
1581 continue;
1582 alive++;
1583 nh_flags &= ~flags;
1584 WRITE_ONCE(nh->nh_flags, nh_flags);
1585 } endfor_nexthops(rt);
1586
1587 WRITE_ONCE(rt->rt_nhn_alive, alive);
1588 }
1589 }
1590
1591 static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1592 void *ptr)
1593 {
1594 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1595 struct mpls_dev *mdev;
1596 unsigned int flags;
1597 int err;
1598
1599 if (event == NETDEV_REGISTER) {
1600 mdev = mpls_add_dev(dev);
1601 if (IS_ERR(mdev))
1602 return notifier_from_errno(PTR_ERR(mdev));
1603
1604 return NOTIFY_OK;
1605 }
1606
1607 mdev = mpls_dev_get(dev);
1608 if (!mdev)
1609 return NOTIFY_OK;
1610
1611 switch (event) {
1612
1613 case NETDEV_DOWN:
1614 err = mpls_ifdown(dev, event);
1615 if (err)
1616 return notifier_from_errno(err);
1617 break;
1618 case NETDEV_UP:
1619 flags = dev_get_flags(dev);
1620 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1621 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1622 else
1623 mpls_ifup(dev, RTNH_F_DEAD);
1624 break;
1625 case NETDEV_CHANGE:
1626 flags = dev_get_flags(dev);
1627 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) {
1628 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1629 } else {
1630 err = mpls_ifdown(dev, event);
1631 if (err)
1632 return notifier_from_errno(err);
1633 }
1634 break;
1635 case NETDEV_UNREGISTER:
1636 err = mpls_ifdown(dev, event);
1637 if (err)
1638 return notifier_from_errno(err);
1639 mdev = mpls_dev_get(dev);
1640 if (mdev) {
1641 mpls_dev_sysctl_unregister(dev, mdev);
1642 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
1643 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
1644 }
1645 break;
1646 case NETDEV_CHANGENAME:
1647 mdev = mpls_dev_get(dev);
1648 if (mdev) {
1649 mpls_dev_sysctl_unregister(dev, mdev);
1650 err = mpls_dev_sysctl_register(dev, mdev);
1651 if (err)
1652 return notifier_from_errno(err);
1653 }
1654 break;
1655 }
1656 return NOTIFY_OK;
1657 }
1658
1659 static struct notifier_block mpls_dev_notifier = {
1660 .notifier_call = mpls_dev_notify,
1661 };
1662
1663 static int nla_put_via(struct sk_buff *skb,
1664 u8 table, const void *addr, int alen)
1665 {
1666 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1667 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1668 };
1669 struct nlattr *nla;
1670 struct rtvia *via;
1671 int family = AF_UNSPEC;
1672
1673 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1674 if (!nla)
1675 return -EMSGSIZE;
1676
1677 if (table <= NEIGH_NR_TABLES)
1678 family = table_to_family[table];
1679
1680 via = nla_data(nla);
1681 via->rtvia_family = family;
1682 memcpy(via->rtvia_addr, addr, alen);
1683 return 0;
1684 }
1685
1686 int nla_put_labels(struct sk_buff *skb, int attrtype,
1687 u8 labels, const u32 label[])
1688 {
1689 struct nlattr *nla;
1690 struct mpls_shim_hdr *nla_label;
1691 bool bos;
1692 int i;
1693 nla = nla_reserve(skb, attrtype, labels*4);
1694 if (!nla)
1695 return -EMSGSIZE;
1696
1697 nla_label = nla_data(nla);
1698 bos = true;
1699 for (i = labels - 1; i >= 0; i--) {
1700 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1701 bos = false;
1702 }
1703
1704 return 0;
1705 }
1706 EXPORT_SYMBOL_GPL(nla_put_labels);
1707
1708 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1709 u32 label[], struct netlink_ext_ack *extack)
1710 {
1711 unsigned len = nla_len(nla);
1712 struct mpls_shim_hdr *nla_label;
1713 u8 nla_labels;
1714 bool bos;
1715 int i;
1716
1717 /* len needs to be an even multiple of 4 (the label size). Number
1718 * of labels is a u8 so check for overflow.
1719 */
1720 if (len & 3 || len / 4 > 255) {
1721 NL_SET_ERR_MSG_ATTR(extack, nla,
1722 "Invalid length for labels attribute");
1723 return -EINVAL;
1724 }
1725
1726 /* Limit the number of new labels allowed */
1727 nla_labels = len/4;
1728 if (nla_labels > max_labels) {
1729 NL_SET_ERR_MSG(extack, "Too many labels");
1730 return -EINVAL;
1731 }
1732
1733 /* when label == NULL, caller wants number of labels */
1734 if (!label)
1735 goto out;
1736
1737 nla_label = nla_data(nla);
1738 bos = true;
1739 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1740 struct mpls_entry_decoded dec;
1741 dec = mpls_entry_decode(nla_label + i);
1742
1743 /* Ensure the bottom of stack flag is properly set
1744 * and ttl and tc are both clear.
1745 */
1746 if (dec.ttl) {
1747 NL_SET_ERR_MSG_ATTR(extack, nla,
1748 "TTL in label must be 0");
1749 return -EINVAL;
1750 }
1751
1752 if (dec.tc) {
1753 NL_SET_ERR_MSG_ATTR(extack, nla,
1754 "Traffic class in label must be 0");
1755 return -EINVAL;
1756 }
1757
1758 if (dec.bos != bos) {
1759 NL_SET_BAD_ATTR(extack, nla);
1760 if (bos) {
1761 NL_SET_ERR_MSG(extack,
1762 "BOS bit must be set in first label");
1763 } else {
1764 NL_SET_ERR_MSG(extack,
1765 "BOS bit can only be set in first label");
1766 }
1767 return -EINVAL;
1768 }
1769
1770 switch (dec.label) {
1771 case MPLS_LABEL_IMPLNULL:
1772 /* RFC3032: This is a label that an LSR may
1773 * assign and distribute, but which never
1774 * actually appears in the encapsulation.
1775 */
1776 NL_SET_ERR_MSG_ATTR(extack, nla,
1777 "Implicit NULL Label (3) can not be used in encapsulation");
1778 return -EINVAL;
1779 }
1780
1781 label[i] = dec.label;
1782 }
1783 out:
1784 *labels = nla_labels;
1785 return 0;
1786 }
1787 EXPORT_SYMBOL_GPL(nla_get_labels);
1788
1789 static int rtm_to_route_config(struct sk_buff *skb,
1790 struct nlmsghdr *nlh,
1791 struct mpls_route_config *cfg,
1792 struct netlink_ext_ack *extack)
1793 {
1794 struct rtmsg *rtm;
1795 struct nlattr *tb[RTA_MAX+1];
1796 int index;
1797 int err;
1798
1799 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1800 rtm_mpls_policy, extack);
1801 if (err < 0)
1802 goto errout;
1803
1804 err = -EINVAL;
1805 rtm = nlmsg_data(nlh);
1806
1807 if (rtm->rtm_family != AF_MPLS) {
1808 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
1809 goto errout;
1810 }
1811 if (rtm->rtm_dst_len != 20) {
1812 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
1813 goto errout;
1814 }
1815 if (rtm->rtm_src_len != 0) {
1816 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
1817 goto errout;
1818 }
1819 if (rtm->rtm_tos != 0) {
1820 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
1821 goto errout;
1822 }
1823 if (rtm->rtm_table != RT_TABLE_MAIN) {
1824 NL_SET_ERR_MSG(extack,
1825 "MPLS only supports the main route table");
1826 goto errout;
1827 }
1828 /* Any value is acceptable for rtm_protocol */
1829
1830 /* As mpls uses destination specific addresses
1831 * (or source specific address in the case of multicast)
1832 * all addresses have universal scope.
1833 */
1834 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1835 NL_SET_ERR_MSG(extack,
1836 "Invalid route scope - MPLS only supports UNIVERSE");
1837 goto errout;
1838 }
1839 if (rtm->rtm_type != RTN_UNICAST) {
1840 NL_SET_ERR_MSG(extack,
1841 "Invalid route type - MPLS only supports UNICAST");
1842 goto errout;
1843 }
1844 if (rtm->rtm_flags != 0) {
1845 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
1846 goto errout;
1847 }
1848
1849 cfg->rc_label = LABEL_NOT_SPECIFIED;
1850 cfg->rc_protocol = rtm->rtm_protocol;
1851 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
1852 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
1853 cfg->rc_nlflags = nlh->nlmsg_flags;
1854 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1855 cfg->rc_nlinfo.nlh = nlh;
1856 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1857
1858 for (index = 0; index <= RTA_MAX; index++) {
1859 struct nlattr *nla = tb[index];
1860 if (!nla)
1861 continue;
1862
1863 switch (index) {
1864 case RTA_OIF:
1865 cfg->rc_ifindex = nla_get_u32(nla);
1866 break;
1867 case RTA_NEWDST:
1868 if (nla_get_labels(nla, MAX_NEW_LABELS,
1869 &cfg->rc_output_labels,
1870 cfg->rc_output_label, extack))
1871 goto errout;
1872 break;
1873 case RTA_DST:
1874 {
1875 u8 label_count;
1876 if (nla_get_labels(nla, 1, &label_count,
1877 &cfg->rc_label, extack))
1878 goto errout;
1879
1880 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
1881 &cfg->rc_label, extack))
1882 goto errout;
1883 break;
1884 }
1885 case RTA_GATEWAY:
1886 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
1887 goto errout;
1888 case RTA_VIA:
1889 {
1890 if (nla_get_via(nla, &cfg->rc_via_alen,
1891 &cfg->rc_via_table, cfg->rc_via,
1892 extack))
1893 goto errout;
1894 break;
1895 }
1896 case RTA_MULTIPATH:
1897 {
1898 cfg->rc_mp = nla_data(nla);
1899 cfg->rc_mp_len = nla_len(nla);
1900 break;
1901 }
1902 case RTA_TTL_PROPAGATE:
1903 {
1904 u8 ttl_propagate = nla_get_u8(nla);
1905
1906 if (ttl_propagate > 1) {
1907 NL_SET_ERR_MSG_ATTR(extack, nla,
1908 "RTA_TTL_PROPAGATE can only be 0 or 1");
1909 goto errout;
1910 }
1911 cfg->rc_ttl_propagate = ttl_propagate ?
1912 MPLS_TTL_PROP_ENABLED :
1913 MPLS_TTL_PROP_DISABLED;
1914 break;
1915 }
1916 default:
1917 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
1918 /* Unsupported attribute */
1919 goto errout;
1920 }
1921 }
1922
1923 err = 0;
1924 errout:
1925 return err;
1926 }
1927
1928 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1929 struct netlink_ext_ack *extack)
1930 {
1931 struct mpls_route_config *cfg;
1932 int err;
1933
1934 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1935 if (!cfg)
1936 return -ENOMEM;
1937
1938 err = rtm_to_route_config(skb, nlh, cfg, extack);
1939 if (err < 0)
1940 goto out;
1941
1942 err = mpls_route_del(cfg, extack);
1943 out:
1944 kfree(cfg);
1945
1946 return err;
1947 }
1948
1949
1950 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1951 struct netlink_ext_ack *extack)
1952 {
1953 struct mpls_route_config *cfg;
1954 int err;
1955
1956 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1957 if (!cfg)
1958 return -ENOMEM;
1959
1960 err = rtm_to_route_config(skb, nlh, cfg, extack);
1961 if (err < 0)
1962 goto out;
1963
1964 err = mpls_route_add(cfg, extack);
1965 out:
1966 kfree(cfg);
1967
1968 return err;
1969 }
1970
1971 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1972 u32 label, struct mpls_route *rt, int flags)
1973 {
1974 struct net_device *dev;
1975 struct nlmsghdr *nlh;
1976 struct rtmsg *rtm;
1977
1978 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1979 if (nlh == NULL)
1980 return -EMSGSIZE;
1981
1982 rtm = nlmsg_data(nlh);
1983 rtm->rtm_family = AF_MPLS;
1984 rtm->rtm_dst_len = 20;
1985 rtm->rtm_src_len = 0;
1986 rtm->rtm_tos = 0;
1987 rtm->rtm_table = RT_TABLE_MAIN;
1988 rtm->rtm_protocol = rt->rt_protocol;
1989 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1990 rtm->rtm_type = RTN_UNICAST;
1991 rtm->rtm_flags = 0;
1992
1993 if (nla_put_labels(skb, RTA_DST, 1, &label))
1994 goto nla_put_failure;
1995
1996 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1997 bool ttl_propagate =
1998 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1999
2000 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
2001 ttl_propagate))
2002 goto nla_put_failure;
2003 }
2004 if (rt->rt_nhn == 1) {
2005 const struct mpls_nh *nh = rt->rt_nh;
2006
2007 if (nh->nh_labels &&
2008 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2009 nh->nh_label))
2010 goto nla_put_failure;
2011 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2012 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2013 nh->nh_via_alen))
2014 goto nla_put_failure;
2015 dev = nh->nh_dev;
2016 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2017 goto nla_put_failure;
2018 if (nh->nh_flags & RTNH_F_LINKDOWN)
2019 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2020 if (nh->nh_flags & RTNH_F_DEAD)
2021 rtm->rtm_flags |= RTNH_F_DEAD;
2022 } else {
2023 struct rtnexthop *rtnh;
2024 struct nlattr *mp;
2025 u8 linkdown = 0;
2026 u8 dead = 0;
2027
2028 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
2029 if (!mp)
2030 goto nla_put_failure;
2031
2032 for_nexthops(rt) {
2033 dev = nh->nh_dev;
2034 if (!dev)
2035 continue;
2036
2037 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
2038 if (!rtnh)
2039 goto nla_put_failure;
2040
2041 rtnh->rtnh_ifindex = dev->ifindex;
2042 if (nh->nh_flags & RTNH_F_LINKDOWN) {
2043 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
2044 linkdown++;
2045 }
2046 if (nh->nh_flags & RTNH_F_DEAD) {
2047 rtnh->rtnh_flags |= RTNH_F_DEAD;
2048 dead++;
2049 }
2050
2051 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2052 nh->nh_labels,
2053 nh->nh_label))
2054 goto nla_put_failure;
2055 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2056 nla_put_via(skb, nh->nh_via_table,
2057 mpls_nh_via(rt, nh),
2058 nh->nh_via_alen))
2059 goto nla_put_failure;
2060
2061 /* length of rtnetlink header + attributes */
2062 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2063 } endfor_nexthops(rt);
2064
2065 if (linkdown == rt->rt_nhn)
2066 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2067 if (dead == rt->rt_nhn)
2068 rtm->rtm_flags |= RTNH_F_DEAD;
2069
2070 nla_nest_end(skb, mp);
2071 }
2072
2073 nlmsg_end(skb, nlh);
2074 return 0;
2075
2076 nla_put_failure:
2077 nlmsg_cancel(skb, nlh);
2078 return -EMSGSIZE;
2079 }
2080
2081 #if IS_ENABLED(CONFIG_INET)
2082 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2083 struct fib_dump_filter *filter,
2084 struct netlink_callback *cb)
2085 {
2086 return ip_valid_fib_dump_req(net, nlh, filter, cb);
2087 }
2088 #else
2089 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2090 struct fib_dump_filter *filter,
2091 struct netlink_callback *cb)
2092 {
2093 struct netlink_ext_ack *extack = cb->extack;
2094 struct nlattr *tb[RTA_MAX + 1];
2095 struct rtmsg *rtm;
2096 int err, i;
2097
2098 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2099 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2100 return -EINVAL;
2101 }
2102
2103 rtm = nlmsg_data(nlh);
2104 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
2105 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2106 rtm->rtm_flags) {
2107 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2108 return -EINVAL;
2109 }
2110
2111 if (rtm->rtm_protocol) {
2112 filter->protocol = rtm->rtm_protocol;
2113 filter->filter_set = 1;
2114 cb->answer_flags = NLM_F_DUMP_FILTERED;
2115 }
2116
2117 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2118 rtm_mpls_policy, extack);
2119 if (err < 0)
2120 return err;
2121
2122 for (i = 0; i <= RTA_MAX; ++i) {
2123 int ifindex;
2124
2125 if (i == RTA_OIF) {
2126 ifindex = nla_get_u32(tb[i]);
2127 filter->dev = __dev_get_by_index(net, ifindex);
2128 if (!filter->dev)
2129 return -ENODEV;
2130 filter->filter_set = 1;
2131 } else if (tb[i]) {
2132 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2133 return -EINVAL;
2134 }
2135 }
2136
2137 return 0;
2138 }
2139 #endif
2140
2141 static bool mpls_rt_uses_dev(struct mpls_route *rt,
2142 const struct net_device *dev)
2143 {
2144 if (rt->rt_nhn == 1) {
2145 struct mpls_nh *nh = rt->rt_nh;
2146
2147 if (nh->nh_dev == dev)
2148 return true;
2149 } else {
2150 for_nexthops(rt) {
2151 if (nh->nh_dev == dev)
2152 return true;
2153 } endfor_nexthops(rt);
2154 }
2155
2156 return false;
2157 }
2158
2159 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2160 {
2161 const struct nlmsghdr *nlh = cb->nlh;
2162 struct net *net = sock_net(skb->sk);
2163 struct mpls_route __rcu **platform_label;
2164 struct fib_dump_filter filter = {
2165 .rtnl_held = true,
2166 };
2167 unsigned int flags = NLM_F_MULTI;
2168 size_t platform_labels;
2169 unsigned int index;
2170
2171 ASSERT_RTNL();
2172
2173 if (cb->strict_check) {
2174 int err;
2175
2176 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
2177 if (err < 0)
2178 return err;
2179
2180 /* for MPLS, there is only 1 table with fixed type and flags.
2181 * If either are set in the filter then return nothing.
2182 */
2183 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2184 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2185 filter.flags)
2186 return skb->len;
2187 }
2188
2189 index = cb->args[0];
2190 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2191 index = MPLS_LABEL_FIRST_UNRESERVED;
2192
2193 platform_label = rtnl_dereference(net->mpls.platform_label);
2194 platform_labels = net->mpls.platform_labels;
2195
2196 if (filter.filter_set)
2197 flags |= NLM_F_DUMP_FILTERED;
2198
2199 for (; index < platform_labels; index++) {
2200 struct mpls_route *rt;
2201
2202 rt = rtnl_dereference(platform_label[index]);
2203 if (!rt)
2204 continue;
2205
2206 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2207 (filter.protocol && rt->rt_protocol != filter.protocol))
2208 continue;
2209
2210 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2211 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
2212 index, rt, flags) < 0)
2213 break;
2214 }
2215 cb->args[0] = index;
2216
2217 return skb->len;
2218 }
2219
2220 static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2221 {
2222 size_t payload =
2223 NLMSG_ALIGN(sizeof(struct rtmsg))
2224 + nla_total_size(4) /* RTA_DST */
2225 + nla_total_size(1); /* RTA_TTL_PROPAGATE */
2226
2227 if (rt->rt_nhn == 1) {
2228 struct mpls_nh *nh = rt->rt_nh;
2229
2230 if (nh->nh_dev)
2231 payload += nla_total_size(4); /* RTA_OIF */
2232 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
2233 payload += nla_total_size(2 + nh->nh_via_alen);
2234 if (nh->nh_labels) /* RTA_NEWDST */
2235 payload += nla_total_size(nh->nh_labels * 4);
2236 } else {
2237 /* each nexthop is packed in an attribute */
2238 size_t nhsize = 0;
2239
2240 for_nexthops(rt) {
2241 if (!nh->nh_dev)
2242 continue;
2243 nhsize += nla_total_size(sizeof(struct rtnexthop));
2244 /* RTA_VIA */
2245 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2246 nhsize += nla_total_size(2 + nh->nh_via_alen);
2247 if (nh->nh_labels)
2248 nhsize += nla_total_size(nh->nh_labels * 4);
2249 } endfor_nexthops(rt);
2250 /* nested attribute */
2251 payload += nla_total_size(nhsize);
2252 }
2253
2254 return payload;
2255 }
2256
2257 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2258 struct nlmsghdr *nlh, struct net *net, u32 portid,
2259 unsigned int nlm_flags)
2260 {
2261 struct sk_buff *skb;
2262 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2263 int err = -ENOBUFS;
2264
2265 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2266 if (skb == NULL)
2267 goto errout;
2268
2269 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2270 if (err < 0) {
2271 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2272 WARN_ON(err == -EMSGSIZE);
2273 kfree_skb(skb);
2274 goto errout;
2275 }
2276 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2277
2278 return;
2279 errout:
2280 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2281 }
2282
2283 static int mpls_valid_getroute_req(struct sk_buff *skb,
2284 const struct nlmsghdr *nlh,
2285 struct nlattr **tb,
2286 struct netlink_ext_ack *extack)
2287 {
2288 struct rtmsg *rtm;
2289 int i, err;
2290
2291 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2292 NL_SET_ERR_MSG_MOD(extack,
2293 "Invalid header for get route request");
2294 return -EINVAL;
2295 }
2296
2297 if (!netlink_strict_get_check(skb))
2298 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2299 rtm_mpls_policy, extack);
2300
2301 rtm = nlmsg_data(nlh);
2302 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
2303 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
2304 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
2305 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
2306 return -EINVAL;
2307 }
2308 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
2309 NL_SET_ERR_MSG_MOD(extack,
2310 "Invalid flags for get route request");
2311 return -EINVAL;
2312 }
2313
2314 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2315 rtm_mpls_policy, extack);
2316 if (err)
2317 return err;
2318
2319 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
2320 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
2321 return -EINVAL;
2322 }
2323
2324 for (i = 0; i <= RTA_MAX; i++) {
2325 if (!tb[i])
2326 continue;
2327
2328 switch (i) {
2329 case RTA_DST:
2330 case RTA_NEWDST:
2331 break;
2332 default:
2333 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
2334 return -EINVAL;
2335 }
2336 }
2337
2338 return 0;
2339 }
2340
2341 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2342 struct netlink_ext_ack *extack)
2343 {
2344 struct net *net = sock_net(in_skb->sk);
2345 u32 portid = NETLINK_CB(in_skb).portid;
2346 u32 in_label = LABEL_NOT_SPECIFIED;
2347 struct nlattr *tb[RTA_MAX + 1];
2348 u32 labels[MAX_NEW_LABELS];
2349 struct mpls_shim_hdr *hdr;
2350 unsigned int hdr_size = 0;
2351 const struct mpls_nh *nh;
2352 struct net_device *dev;
2353 struct mpls_route *rt;
2354 struct rtmsg *rtm, *r;
2355 struct nlmsghdr *nlh;
2356 struct sk_buff *skb;
2357 u8 n_labels;
2358 int err;
2359
2360 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack);
2361 if (err < 0)
2362 goto errout;
2363
2364 rtm = nlmsg_data(in_nlh);
2365
2366 if (tb[RTA_DST]) {
2367 u8 label_count;
2368
2369 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
2370 &in_label, extack)) {
2371 err = -EINVAL;
2372 goto errout;
2373 }
2374
2375 if (!mpls_label_ok(net, &in_label, extack)) {
2376 err = -EINVAL;
2377 goto errout;
2378 }
2379 }
2380
2381 rt = mpls_route_input_rcu(net, in_label);
2382 if (!rt) {
2383 err = -ENETUNREACH;
2384 goto errout;
2385 }
2386
2387 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2388 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2389 if (!skb) {
2390 err = -ENOBUFS;
2391 goto errout;
2392 }
2393
2394 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2395 RTM_NEWROUTE, in_label, rt, 0);
2396 if (err < 0) {
2397 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2398 WARN_ON(err == -EMSGSIZE);
2399 goto errout_free;
2400 }
2401
2402 return rtnl_unicast(skb, net, portid);
2403 }
2404
2405 if (tb[RTA_NEWDST]) {
2406 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2407 labels, extack) != 0) {
2408 err = -EINVAL;
2409 goto errout;
2410 }
2411
2412 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2413 }
2414
2415 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2416 if (!skb) {
2417 err = -ENOBUFS;
2418 goto errout;
2419 }
2420
2421 skb->protocol = htons(ETH_P_MPLS_UC);
2422
2423 if (hdr_size) {
2424 bool bos;
2425 int i;
2426
2427 if (skb_cow(skb, hdr_size)) {
2428 err = -ENOBUFS;
2429 goto errout_free;
2430 }
2431
2432 skb_reserve(skb, hdr_size);
2433 skb_push(skb, hdr_size);
2434 skb_reset_network_header(skb);
2435
2436 /* Push new labels */
2437 hdr = mpls_hdr(skb);
2438 bos = true;
2439 for (i = n_labels - 1; i >= 0; i--) {
2440 hdr[i] = mpls_entry_encode(labels[i],
2441 1, 0, bos);
2442 bos = false;
2443 }
2444 }
2445
2446 nh = mpls_select_multipath(rt, skb);
2447 if (!nh) {
2448 err = -ENETUNREACH;
2449 goto errout_free;
2450 }
2451
2452 if (hdr_size) {
2453 skb_pull(skb, hdr_size);
2454 skb_reset_network_header(skb);
2455 }
2456
2457 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2458 RTM_NEWROUTE, sizeof(*r), 0);
2459 if (!nlh) {
2460 err = -EMSGSIZE;
2461 goto errout_free;
2462 }
2463
2464 r = nlmsg_data(nlh);
2465 r->rtm_family = AF_MPLS;
2466 r->rtm_dst_len = 20;
2467 r->rtm_src_len = 0;
2468 r->rtm_table = RT_TABLE_MAIN;
2469 r->rtm_type = RTN_UNICAST;
2470 r->rtm_scope = RT_SCOPE_UNIVERSE;
2471 r->rtm_protocol = rt->rt_protocol;
2472 r->rtm_flags = 0;
2473
2474 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2475 goto nla_put_failure;
2476
2477 if (nh->nh_labels &&
2478 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2479 nh->nh_label))
2480 goto nla_put_failure;
2481
2482 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2483 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2484 nh->nh_via_alen))
2485 goto nla_put_failure;
2486 dev = nh->nh_dev;
2487 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2488 goto nla_put_failure;
2489
2490 nlmsg_end(skb, nlh);
2491
2492 err = rtnl_unicast(skb, net, portid);
2493 errout:
2494 return err;
2495
2496 nla_put_failure:
2497 nlmsg_cancel(skb, nlh);
2498 err = -EMSGSIZE;
2499 errout_free:
2500 kfree_skb(skb);
2501 return err;
2502 }
2503
2504 static int resize_platform_label_table(struct net *net, size_t limit)
2505 {
2506 size_t size = sizeof(struct mpls_route *) * limit;
2507 size_t old_limit;
2508 size_t cp_size;
2509 struct mpls_route __rcu **labels = NULL, **old;
2510 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2511 unsigned index;
2512
2513 if (size) {
2514 labels = kvzalloc(size, GFP_KERNEL);
2515 if (!labels)
2516 goto nolabels;
2517 }
2518
2519 /* In case the predefined labels need to be populated */
2520 if (limit > MPLS_LABEL_IPV4NULL) {
2521 struct net_device *lo = net->loopback_dev;
2522 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
2523 if (IS_ERR(rt0))
2524 goto nort0;
2525 rt0->rt_nh->nh_dev = lo;
2526 rt0->rt_protocol = RTPROT_KERNEL;
2527 rt0->rt_payload_type = MPT_IPV4;
2528 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2529 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2530 rt0->rt_nh->nh_via_alen = lo->addr_len;
2531 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2532 lo->addr_len);
2533 }
2534 if (limit > MPLS_LABEL_IPV6NULL) {
2535 struct net_device *lo = net->loopback_dev;
2536 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
2537 if (IS_ERR(rt2))
2538 goto nort2;
2539 rt2->rt_nh->nh_dev = lo;
2540 rt2->rt_protocol = RTPROT_KERNEL;
2541 rt2->rt_payload_type = MPT_IPV6;
2542 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
2543 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
2544 rt2->rt_nh->nh_via_alen = lo->addr_len;
2545 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2546 lo->addr_len);
2547 }
2548
2549 rtnl_lock();
2550 /* Remember the original table */
2551 old = rtnl_dereference(net->mpls.platform_label);
2552 old_limit = net->mpls.platform_labels;
2553
2554 /* Free any labels beyond the new table */
2555 for (index = limit; index < old_limit; index++)
2556 mpls_route_update(net, index, NULL, NULL);
2557
2558 /* Copy over the old labels */
2559 cp_size = size;
2560 if (old_limit < limit)
2561 cp_size = old_limit * sizeof(struct mpls_route *);
2562
2563 memcpy(labels, old, cp_size);
2564
2565 /* If needed set the predefined labels */
2566 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2567 (limit > MPLS_LABEL_IPV6NULL)) {
2568 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
2569 rt2 = NULL;
2570 }
2571
2572 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2573 (limit > MPLS_LABEL_IPV4NULL)) {
2574 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
2575 rt0 = NULL;
2576 }
2577
2578 /* Update the global pointers */
2579 net->mpls.platform_labels = limit;
2580 rcu_assign_pointer(net->mpls.platform_label, labels);
2581
2582 rtnl_unlock();
2583
2584 mpls_rt_free(rt2);
2585 mpls_rt_free(rt0);
2586
2587 if (old) {
2588 synchronize_rcu();
2589 kvfree(old);
2590 }
2591 return 0;
2592
2593 nort2:
2594 mpls_rt_free(rt0);
2595 nort0:
2596 kvfree(labels);
2597 nolabels:
2598 return -ENOMEM;
2599 }
2600
2601 static int mpls_platform_labels(const struct ctl_table *table, int write,
2602 void *buffer, size_t *lenp, loff_t *ppos)
2603 {
2604 struct net *net = table->data;
2605 int platform_labels = net->mpls.platform_labels;
2606 int ret;
2607 struct ctl_table tmp = {
2608 .procname = table->procname,
2609 .data = &platform_labels,
2610 .maxlen = sizeof(int),
2611 .mode = table->mode,
2612 .extra1 = SYSCTL_ZERO,
2613 .extra2 = &label_limit,
2614 };
2615
2616 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2617
2618 if (write && ret == 0)
2619 ret = resize_platform_label_table(net, platform_labels);
2620
2621 return ret;
2622 }
2623
2624 #define MPLS_NS_SYSCTL_OFFSET(field) \
2625 (&((struct net *)0)->field)
2626
2627 static const struct ctl_table mpls_table[] = {
2628 {
2629 .procname = "platform_labels",
2630 .data = NULL,
2631 .maxlen = sizeof(int),
2632 .mode = 0644,
2633 .proc_handler = mpls_platform_labels,
2634 },
2635 {
2636 .procname = "ip_ttl_propagate",
2637 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2638 .maxlen = sizeof(int),
2639 .mode = 0644,
2640 .proc_handler = proc_dointvec_minmax,
2641 .extra1 = SYSCTL_ZERO,
2642 .extra2 = SYSCTL_ONE,
2643 },
2644 {
2645 .procname = "default_ttl",
2646 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2647 .maxlen = sizeof(int),
2648 .mode = 0644,
2649 .proc_handler = proc_dointvec_minmax,
2650 .extra1 = SYSCTL_ONE,
2651 .extra2 = &ttl_max,
2652 },
2653 };
2654
2655 static int mpls_net_init(struct net *net)
2656 {
2657 size_t table_size = ARRAY_SIZE(mpls_table);
2658 struct ctl_table *table;
2659 int i;
2660
2661 net->mpls.platform_labels = 0;
2662 net->mpls.platform_label = NULL;
2663 net->mpls.ip_ttl_propagate = 1;
2664 net->mpls.default_ttl = 255;
2665
2666 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2667 if (table == NULL)
2668 return -ENOMEM;
2669
2670 /* Table data contains only offsets relative to the base of
2671 * the mdev at this point, so make them absolute.
2672 */
2673 for (i = 0; i < table_size; i++)
2674 table[i].data = (char *)net + (uintptr_t)table[i].data;
2675
2676 net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table,
2677 table_size);
2678 if (net->mpls.ctl == NULL) {
2679 kfree(table);
2680 return -ENOMEM;
2681 }
2682
2683 return 0;
2684 }
2685
2686 static void mpls_net_exit(struct net *net)
2687 {
2688 struct mpls_route __rcu **platform_label;
2689 size_t platform_labels;
2690 const struct ctl_table *table;
2691 unsigned int index;
2692
2693 table = net->mpls.ctl->ctl_table_arg;
2694 unregister_net_sysctl_table(net->mpls.ctl);
2695 kfree(table);
2696
2697 /* An rcu grace period has passed since there was a device in
2698 * the network namespace (and thus the last in flight packet)
2699 * left this network namespace. This is because
2700 * unregister_netdevice_many and netdev_run_todo has completed
2701 * for each network device that was in this network namespace.
2702 *
2703 * As such no additional rcu synchronization is necessary when
2704 * freeing the platform_label table.
2705 */
2706 rtnl_lock();
2707 platform_label = rtnl_dereference(net->mpls.platform_label);
2708 platform_labels = net->mpls.platform_labels;
2709 for (index = 0; index < platform_labels; index++) {
2710 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2711 RCU_INIT_POINTER(platform_label[index], NULL);
2712 mpls_notify_route(net, index, rt, NULL, NULL);
2713 mpls_rt_free(rt);
2714 }
2715 rtnl_unlock();
2716
2717 kvfree(platform_label);
2718 }
2719
2720 static struct pernet_operations mpls_net_ops = {
2721 .init = mpls_net_init,
2722 .exit = mpls_net_exit,
2723 };
2724
2725 static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2726 .family = AF_MPLS,
2727 .fill_stats_af = mpls_fill_stats_af,
2728 .get_stats_af_size = mpls_get_stats_af_size,
2729 };
2730
2731 static const struct rtnl_msg_handler mpls_rtnl_msg_handlers[] __initdata_or_module = {
2732 {THIS_MODULE, PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, 0},
2733 {THIS_MODULE, PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, 0},
2734 {THIS_MODULE, PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, 0},
2735 {THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2736 mpls_netconf_get_devconf, mpls_netconf_dump_devconf,
2737 RTNL_FLAG_DUMP_UNLOCKED},
2738 };
2739
2740 static int __init mpls_init(void)
2741 {
2742 int err;
2743
2744 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2745
2746 err = register_pernet_subsys(&mpls_net_ops);
2747 if (err)
2748 goto out;
2749
2750 err = register_netdevice_notifier(&mpls_dev_notifier);
2751 if (err)
2752 goto out_unregister_pernet;
2753
2754 dev_add_pack(&mpls_packet_type);
2755
2756 rtnl_af_register(&mpls_af_ops);
2757
2758 err = rtnl_register_many(mpls_rtnl_msg_handlers);
2759 if (err)
2760 goto out_unregister_rtnl_af;
2761
2762 err = ipgre_tunnel_encap_add_mpls_ops();
2763 if (err) {
2764 pr_err("Can't add mpls over gre tunnel ops\n");
2765 goto out_unregister_rtnl;
2766 }
2767
2768 err = 0;
2769 out:
2770 return err;
2771
2772 out_unregister_rtnl:
2773 rtnl_unregister_many(mpls_rtnl_msg_handlers);
2774 out_unregister_rtnl_af:
2775 rtnl_af_unregister(&mpls_af_ops);
2776 dev_remove_pack(&mpls_packet_type);
2777 out_unregister_pernet:
2778 unregister_pernet_subsys(&mpls_net_ops);
2779 goto out;
2780 }
2781 module_init(mpls_init);
2782
2783 static void __exit mpls_exit(void)
2784 {
2785 rtnl_unregister_all(PF_MPLS);
2786 rtnl_af_unregister(&mpls_af_ops);
2787 dev_remove_pack(&mpls_packet_type);
2788 unregister_netdevice_notifier(&mpls_dev_notifier);
2789 unregister_pernet_subsys(&mpls_net_ops);
2790 ipgre_tunnel_encap_del_mpls_ops();
2791 }
2792 module_exit(mpls_exit);
2793
2794 MODULE_DESCRIPTION("MultiProtocol Label Switching");
2795 MODULE_LICENSE("GPL v2");
2796 MODULE_ALIAS_NETPROTO(PF_MPLS);
Kernel DRM miscellaneous fixes and cross-tree changes