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xfrm: prefer secpath_set over secpath_dup
[linux-2.6-block.git] / net / mpls / af_mpls.c
CommitLineData
0189197f
EB		 1#include <linux/types.h>
2#include <linux/skbuff.h>
3#include <linux/socket.h>
7720c01f 4#include <linux/sysctl.h>
0189197f
EB		 5#include <linux/net.h>
6#include <linux/module.h>
7#include <linux/if_arp.h>
8#include <linux/ipv6.h>
9#include <linux/mpls.h>
24045a03 10#include <linux/netconf.h>
3968523f 11#include <linux/nospec.h>
4b5edb2f 12#include <linux/vmalloc.h>
27d69105 13#include <linux/percpu.h>
0189197f
EB		 14#include <net/ip.h>
15#include <net/dst.h>
16#include <net/sock.h>
17#include <net/arp.h>
18#include <net/ip_fib.h>
19#include <net/netevent.h>
bdc47641 20#include <net/ip_tunnels.h>
0189197f 21#include <net/netns/generic.h>
bf21563a
RP		 22#if IS_ENABLED(CONFIG_IPV6)
23#include <net/ipv6.h>
bf21563a 24#endif
27d69105 25#include <net/addrconf.h>
f8efb73c 26#include <net/nexthop.h>
0189197f
EB		 27#include "internal.h"
28
df1c6316
DA		 29/* max memory we will use for mpls_route */
30#define MAX_MPLS_ROUTE_MEM 4096
31
1c78efa8
RS		 32/* Maximum number of labels to look ahead at when selecting a path of
33 * a multipath route
34 */
35#define MAX_MP_SELECT_LABELS 4
36
eb7809f0
RS		 37#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)
38
7720c01f 39static int zero = 0;
5b441ac8 40static int one = 1;
7720c01f 41static int label_limit = (1 << 20) - 1;
a59166e4 42static int ttl_max = 255;
7720c01f 43
bdc47641 44#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
14c68c43 45static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
bdc47641
AK		 46{
47 return sizeof(struct mpls_shim_hdr);
48}
49
50static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
51 .encap_hlen = ipgre_mpls_encap_hlen,
52};
53
54static int ipgre_tunnel_encap_add_mpls_ops(void)
55{
56 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
57}
58
59static void ipgre_tunnel_encap_del_mpls_ops(void)
60{
61 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
62}
63#else
64static int ipgre_tunnel_encap_add_mpls_ops(void)
65{
66 return 0;
67}
68
69static void ipgre_tunnel_encap_del_mpls_ops(void)
70{
71}
72#endif
73
8de147dc
EB		 74static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
75 struct nlmsghdr *nlh, struct net *net, u32 portid,
76 unsigned int nlm_flags);
77
0189197f
EB		 78static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
79{
80 struct mpls_route *rt = NULL;
81
82 if (index < net->mpls.platform_labels) {
83 struct mpls_route __rcu **platform_label =
84 rcu_dereference(net->mpls.platform_label);
85 rt = rcu_dereference(platform_label[index]);
86 }
87 return rt;
88}
89
face0188 90bool mpls_output_possible(const struct net_device *dev)
0189197f
EB		 91{
92 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
93}
face0188 94EXPORT_SYMBOL_GPL(mpls_output_possible);
0189197f 95
cf4b24f0
RS		 96static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
97{
59b20966 98 return (u8 *)nh + rt->rt_via_offset;
cf4b24f0
RS		 99}
100
101static const u8 *mpls_nh_via(const struct mpls_route *rt,
102 const struct mpls_nh *nh)
103{
104 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
105}
106
f8efb73c 107static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
0189197f
EB		 108{
109 /* The size of the layer 2.5 labels to be added for this route */
f8efb73c 110 return nh->nh_labels * sizeof(struct mpls_shim_hdr);
0189197f
EB		 111}
112
face0188 113unsigned int mpls_dev_mtu(const struct net_device *dev)
0189197f
EB		 114{
115 /* The amount of data the layer 2 frame can hold */
116 return dev->mtu;
117}
face0188 118EXPORT_SYMBOL_GPL(mpls_dev_mtu);
0189197f 119
face0188 120bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
0189197f
EB		 121{
122 if (skb->len <= mtu)
123 return false;
124
779b7931 125 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
0189197f
EB		 126 return false;
127
128 return true;
129}
face0188 130EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
0189197f 131
27d69105
RS		 132void mpls_stats_inc_outucastpkts(struct net_device *dev,
133 const struct sk_buff *skb)
134{
135 struct mpls_dev *mdev;
136
137 if (skb->protocol == htons(ETH_P_MPLS_UC)) {
138 mdev = mpls_dev_get(dev);
139 if (mdev)
140 MPLS_INC_STATS_LEN(mdev, skb->len,
141 tx_packets,
142 tx_bytes);
143 } else if (skb->protocol == htons(ETH_P_IP)) {
144 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
145#if IS_ENABLED(CONFIG_IPV6)
146 } else if (skb->protocol == htons(ETH_P_IPV6)) {
147 struct inet6_dev *in6dev = __in6_dev_get(dev);
148
149 if (in6dev)
150 IP6_UPD_PO_STATS(dev_net(dev), in6dev,
151 IPSTATS_MIB_OUT, skb->len);
152#endif
153 }
154}
155EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);
156
9f427a0e 157static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
f8efb73c 158{
1c78efa8 159 struct mpls_entry_decoded dec;
9f427a0e 160 unsigned int mpls_hdr_len = 0;
1c78efa8
RS		 161 struct mpls_shim_hdr *hdr;
162 bool eli_seen = false;
163 int label_index;
1c78efa8
RS		 164 u32 hash = 0;
165
9f427a0e 166 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
1c78efa8 167 label_index++) {
9f427a0e
DA		 168 mpls_hdr_len += sizeof(*hdr);
169 if (!pskb_may_pull(skb, mpls_hdr_len))
1c78efa8
RS		 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
9f427a0e
DA		 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))) {
1c78efa8
RS		 199 const struct iphdr *v4hdr;
200
9f427a0e 201 v4hdr = (const struct iphdr *)(hdr + 1);
1c78efa8
RS		 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 &&
9f427a0e
DA		 207 pskb_may_pull(skb, mpls_hdr_len +
208 sizeof(struct ipv6hdr))) {
1c78efa8
RS		 209 const struct ipv6hdr *v6hdr;
210
9f427a0e 211 v6hdr = (const struct ipv6hdr *)(hdr + 1);
1c78efa8
RS		 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 }
9f427a0e
DA		 217
218 break;
1c78efa8
RS		 219 }
220
c89359a4
RP		 221 return hash;
222}
223
59b20966
DA		 224static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
225{
226 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
227}
228
39eb8cd1
DA		 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 */
c89359a4 234static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
9f427a0e 235 struct sk_buff *skb)
c89359a4 236{
c89359a4
RP		 237 u32 hash = 0;
238 int nh_index = 0;
239 int n = 0;
77ef013a 240 u8 alive;
c89359a4
RP		 241
242 /* No need to look further into packet if there's only
243 * one path
244 */
245 if (rt->rt_nhn == 1)
59b20966 246 return rt->rt_nh;
c89359a4 247
39eb8cd1
DA		 248 alive = READ_ONCE(rt->rt_nhn_alive);
249 if (alive == 0)
c89359a4
RP		 250 return NULL;
251
9f427a0e 252 hash = mpls_multipath_hash(rt, skb);
c89359a4
RP		 253 nh_index = hash % alive;
254 if (alive == rt->rt_nhn)
255 goto out;
256 for_nexthops(rt) {
39eb8cd1
DA		 257 unsigned int nh_flags = READ_ONCE(nh->nh_flags);
258
259 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
c89359a4
RP		 260 continue;
261 if (n == nh_index)
262 return nh;
263 n++;
264 } endfor_nexthops(rt);
265
1c78efa8 266out:
59b20966 267 return mpls_get_nexthop(rt, nh_index);
f8efb73c
RP		 268}
269
5b441ac8
RS		 270static bool mpls_egress(struct net *net, struct mpls_route *rt,
271 struct sk_buff *skb, struct mpls_entry_decoded dec)
0189197f 272{
118d5234
RS		 273 enum mpls_payload_type payload_type;
274 bool success = false;
0189197f 275
76fecd82
EB		 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
118d5234
RS		 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);
5b441ac8 296 u8 new_ttl;
0189197f 297 skb->protocol = htons(ETH_P_IP);
5b441ac8
RS		 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
0189197f
EB		 310 csum_replace2(&hdr4->check,
311 htons(hdr4->ttl << 8),
5b441ac8
RS		 312 htons(new_ttl << 8));
313 hdr4->ttl = new_ttl;
118d5234
RS		 314 success = true;
315 break;
0189197f 316 }
118d5234 317 case MPT_IPV6: {
0189197f
EB		 318 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
319 skb->protocol = htons(ETH_P_IPV6);
5b441ac8
RS		 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;
118d5234
RS		 331 success = true;
332 break;
0189197f 333 }
118d5234 334 case MPT_UNSPEC:
5b441ac8 335 /* Should have decided which protocol it is by now */
118d5234
RS		 336 break;
337 }
338
0189197f
EB		 339 return success;
340}
341
342static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
343 struct packet_type *pt, struct net_device *orig_dev)
344{
345 struct net *net = dev_net(dev);
346 struct mpls_shim_hdr *hdr;
347 struct mpls_route *rt;
f8efb73c 348 struct mpls_nh *nh;
0189197f
EB		 349 struct mpls_entry_decoded dec;
350 struct net_device *out_dev;
27d69105 351 struct mpls_dev *out_mdev;
03c57747 352 struct mpls_dev *mdev;
0189197f
EB		 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
03c57747 360 mdev = mpls_dev_get(dev);
27d69105 361 if (!mdev)
03c57747
RS		 362 goto drop;
363
27d69105
RS		 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);
0189197f 369 goto drop;
27d69105
RS		 370 }
371
372 if (skb->pkt_type != PACKET_HOST)
373 goto err;
0189197f
EB		 374
375 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
27d69105 376 goto err;
0189197f
EB		 377
378 if (!pskb_may_pull(skb, sizeof(*hdr)))
27d69105 379 goto err;
0189197f
EB		 380
381 /* Read and decode the label */
382 hdr = mpls_hdr(skb);
383 dec = mpls_entry_decode(hdr);
384
0189197f 385 rt = mpls_route_input_rcu(net, dec.label);
27d69105
RS		 386 if (!rt) {
387 MPLS_INC_STATS(mdev, rx_noroute);
0189197f 388 goto drop;
27d69105 389 }
0189197f 390
9f427a0e 391 nh = mpls_select_multipath(rt, skb);
f8efb73c 392 if (!nh)
27d69105 393 goto err;
0189197f 394
9f427a0e
DA		 395 /* Pop the label */
396 skb_pull(skb, sizeof(*hdr));
397 skb_reset_network_header(skb);
398
399 skb_orphan(skb);
400
0189197f 401 if (skb_warn_if_lro(skb))
27d69105 402 goto err;
0189197f
EB		 403
404 skb_forward_csum(skb);
405
406 /* Verify ttl is valid */
aa7da937 407 if (dec.ttl <= 1)
27d69105 408 goto err;
0189197f
EB		 409 dec.ttl -= 1;
410
27d69105
RS		 411 /* Find the output device */
412 out_dev = rcu_dereference(nh->nh_dev);
413 if (!mpls_output_possible(out_dev))
414 goto tx_err;
415
0189197f 416 /* Verify the destination can hold the packet */
f8efb73c 417 new_header_size = mpls_nh_header_size(nh);
0189197f
EB		 418 mtu = mpls_dev_mtu(out_dev);
419 if (mpls_pkt_too_big(skb, mtu - new_header_size))
27d69105 420 goto tx_err;
0189197f
EB		 421
422 hh_len = LL_RESERVED_SPACE(out_dev);
423 if (!out_dev->header_ops)
424 hh_len = 0;
425
426 /* Ensure there is enough space for the headers in the skb */
427 if (skb_cow(skb, hh_len + new_header_size))
27d69105 428 goto tx_err;
0189197f
EB		 429
430 skb->dev = out_dev;
431 skb->protocol = htons(ETH_P_MPLS_UC);
432
433 if (unlikely(!new_header_size && dec.bos)) {
434 /* Penultimate hop popping */
5b441ac8 435 if (!mpls_egress(dev_net(out_dev), rt, skb, dec))
27d69105 436 goto err;
0189197f
EB		 437 } else {
438 bool bos;
439 int i;
440 skb_push(skb, new_header_size);
441 skb_reset_network_header(skb);
442 /* Push the new labels */
443 hdr = mpls_hdr(skb);
444 bos = dec.bos;
f8efb73c
RP		 445 for (i = nh->nh_labels - 1; i >= 0; i--) {
446 hdr[i] = mpls_entry_encode(nh->nh_label[i],
447 dec.ttl, 0, bos);
0189197f
EB		 448 bos = false;
449 }
450 }
451
27d69105
RS		 452 mpls_stats_inc_outucastpkts(out_dev, skb);
453
eb7809f0
RS		 454 /* If via wasn't specified then send out using device address */
455 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
456 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
457 out_dev->dev_addr, skb);
458 else
459 err = neigh_xmit(nh->nh_via_table, out_dev,
460 mpls_nh_via(rt, nh), skb);
0189197f
EB		 461 if (err)
462 net_dbg_ratelimited("%s: packet transmission failed: %d\n",
463 __func__, err);
464 return 0;
465
27d69105
RS		 466tx_err:
467 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
468 if (out_mdev)
469 MPLS_INC_STATS(out_mdev, tx_errors);
470 goto drop;
471err:
472 MPLS_INC_STATS(mdev, rx_errors);
0189197f
EB		 473drop:
474 kfree_skb(skb);
475 return NET_RX_DROP;
476}
477
478static struct packet_type mpls_packet_type __read_mostly = {
479 .type = cpu_to_be16(ETH_P_MPLS_UC),
480 .func = mpls_forward,
481};
482
f0126539 483static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
03c05665
EB		 484 [RTA_DST] = { .type = NLA_U32 },
485 [RTA_OIF] = { .type = NLA_U32 },
5b441ac8 486 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
03c05665
EB		 487};
488
a2519929 489struct mpls_route_config {
118d5234
RS		 490 u32 rc_protocol;
491 u32 rc_ifindex;
f8efb73c
RP		 492 u8 rc_via_table;
493 u8 rc_via_alen;
118d5234
RS		 494 u8 rc_via[MAX_VIA_ALEN];
495 u32 rc_label;
5b441ac8 496 u8 rc_ttl_propagate;
f8efb73c 497 u8 rc_output_labels;
118d5234
RS		 498 u32 rc_output_label[MAX_NEW_LABELS];
499 u32 rc_nlflags;
500 enum mpls_payload_type rc_payload_type;
501 struct nl_info rc_nlinfo;
f8efb73c
RP		 502 struct rtnexthop *rc_mp;
503 int rc_mp_len;
a2519929
EB		 504};
505
59b20966
DA		 506/* all nexthops within a route have the same size based on max
507 * number of labels and max via length for a hop
508 */
509static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
0189197f 510{
59b20966 511 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
0189197f 512 struct mpls_route *rt;
df1c6316 513 size_t size;
0189197f 514
df1c6316
DA		 515 size = sizeof(*rt) + num_nh * nh_size;
516 if (size > MAX_MPLS_ROUTE_MEM)
517 return ERR_PTR(-EINVAL);
518
519 rt = kzalloc(size, GFP_KERNEL);
520 if (!rt)
521 return ERR_PTR(-ENOMEM);
522
523 rt->rt_nhn = num_nh;
524 rt->rt_nhn_alive = num_nh;
525 rt->rt_nh_size = nh_size;
526 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels);
f8efb73c 527
0189197f
EB		 528 return rt;
529}
530
531static void mpls_rt_free(struct mpls_route *rt)
532{
533 if (rt)
534 kfree_rcu(rt, rt_rcu);
535}
536
8de147dc
EB		 537static void mpls_notify_route(struct net *net, unsigned index,
538 struct mpls_route *old, struct mpls_route *new,
539 const struct nl_info *info)
540{
541 struct nlmsghdr *nlh = info ? info->nlh : NULL;
542 unsigned portid = info ? info->portid : 0;
543 int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
544 struct mpls_route *rt = new ? new : old;
545 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
546 /* Ignore reserved labels for now */
a6affd24 547 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
8de147dc
EB		 548 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
549}
550
0189197f 551static void mpls_route_update(struct net *net, unsigned index,
f8efb73c 552 struct mpls_route *new,
0189197f
EB		 553 const struct nl_info *info)
554{
19d0c341 555 struct mpls_route __rcu **platform_label;
f8efb73c 556 struct mpls_route *rt;
0189197f
EB		 557
558 ASSERT_RTNL();
559
19d0c341
EB		 560 platform_label = rtnl_dereference(net->mpls.platform_label);
561 rt = rtnl_dereference(platform_label[index]);
f8efb73c 562 rcu_assign_pointer(platform_label[index], new);
0189197f 563
f8efb73c 564 mpls_notify_route(net, index, rt, new, info);
8de147dc 565
0189197f 566 /* If we removed a route free it now */
f8efb73c 567 mpls_rt_free(rt);
0189197f
EB		 568}
569
a2519929
EB		 570static unsigned find_free_label(struct net *net)
571{
19d0c341
EB		 572 struct mpls_route __rcu **platform_label;
573 size_t platform_labels;
a2519929 574 unsigned index;
19d0c341
EB		 575
576 platform_label = rtnl_dereference(net->mpls.platform_label);
577 platform_labels = net->mpls.platform_labels;
a6affd24
RS		 578 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
579 index++) {
19d0c341 580 if (!rtnl_dereference(platform_label[index]))
a2519929
EB		 581 return index;
582 }
583 return LABEL_NOT_SPECIFIED;
584}
585
bf21563a 586#if IS_ENABLED(CONFIG_INET)
cf4b24f0
RS		 587static struct net_device *inet_fib_lookup_dev(struct net *net,
588 const void *addr)
01faef2c 589{
5a9348b5 590 struct net_device *dev;
01faef2c
RP		 591 struct rtable *rt;
592 struct in_addr daddr;
593
594 memcpy(&daddr, addr, sizeof(struct in_addr));
595 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
596 if (IS_ERR(rt))
5a9348b5 597 return ERR_CAST(rt);
01faef2c
RP		 598
599 dev = rt->dst.dev;
600 dev_hold(dev);
601
602 ip_rt_put(rt);
603
01faef2c 604 return dev;
bf21563a
RP		 605}
606#else
cf4b24f0
RS		 607static struct net_device *inet_fib_lookup_dev(struct net *net,
608 const void *addr)
bf21563a
RP		 609{
610 return ERR_PTR(-EAFNOSUPPORT);
01faef2c 611}
bf21563a 612#endif
01faef2c 613
bf21563a 614#if IS_ENABLED(CONFIG_IPV6)
cf4b24f0
RS		 615static struct net_device *inet6_fib_lookup_dev(struct net *net,
616 const void *addr)
01faef2c 617{
5a9348b5 618 struct net_device *dev;
01faef2c
RP		 619 struct dst_entry *dst;
620 struct flowi6 fl6;
bf21563a
RP		 621 int err;
622
623 if (!ipv6_stub)
624 return ERR_PTR(-EAFNOSUPPORT);
01faef2c
RP		 625
626 memset(&fl6, 0, sizeof(fl6));
627 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
bf21563a
RP		 628 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
629 if (err)
5a9348b5 630 return ERR_PTR(err);
01faef2c
RP		 631
632 dev = dst->dev;
633 dev_hold(dev);
01faef2c
RP		 634 dst_release(dst);
635
636 return dev;
637}
bf21563a 638#else
cf4b24f0
RS		 639static struct net_device *inet6_fib_lookup_dev(struct net *net,
640 const void *addr)
bf21563a
RP		 641{
642 return ERR_PTR(-EAFNOSUPPORT);
643}
644#endif
01faef2c
RP		 645
646static struct net_device *find_outdev(struct net *net,
cf4b24f0 647 struct mpls_route *rt,
f8efb73c 648 struct mpls_nh *nh, int oif)
01faef2c
RP		 649{
650 struct net_device *dev = NULL;
651
f8efb73c
RP		 652 if (!oif) {
653 switch (nh->nh_via_table) {
01faef2c 654 case NEIGH_ARP_TABLE:
cf4b24f0 655 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
01faef2c
RP		 656 break;
657 case NEIGH_ND_TABLE:
cf4b24f0 658 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
01faef2c
RP		 659 break;
660 case NEIGH_LINK_TABLE:
661 break;
662 }
663 } else {
f8efb73c 664 dev = dev_get_by_index(net, oif);
01faef2c
RP		 665 }
666
3dcb615e
RP		 667 if (!dev)
668 return ERR_PTR(-ENODEV);
669
94a57f1f
RP		 670 if (IS_ERR(dev))
671 return dev;
672
f8efb73c
RP		 673 /* The caller is holding rtnl anyways, so release the dev reference */
674 dev_put(dev);
675
01faef2c
RP		 676 return dev;
677}
678
cf4b24f0
RS		 679static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
680 struct mpls_nh *nh, int oif)
f8efb73c
RP		 681{
682 struct net_device *dev = NULL;
683 int err = -ENODEV;
684
cf4b24f0 685 dev = find_outdev(net, rt, nh, oif);
f8efb73c
RP		 686 if (IS_ERR(dev)) {
687 err = PTR_ERR(dev);
688 dev = NULL;
689 goto errout;
690 }
691
692 /* Ensure this is a supported device */
693 err = -EINVAL;
694 if (!mpls_dev_get(dev))
695 goto errout;
696
a3e948e8
RS		 697 if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
698 (dev->addr_len != nh->nh_via_alen))
699 goto errout;
700
f8efb73c
RP		 701 RCU_INIT_POINTER(nh->nh_dev, dev);
702
c89359a4
RP		 703 if (!(dev->flags & IFF_UP)) {
704 nh->nh_flags |= RTNH_F_DEAD;
705 } else {
706 unsigned int flags;
707
708 flags = dev_get_flags(dev);
709 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
710 nh->nh_flags |= RTNH_F_LINKDOWN;
711 }
712
f8efb73c
RP		 713 return 0;
714
715errout:
716 return err;
717}
718
d4e72560
DA		 719static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
720 u8 via_addr[], struct netlink_ext_ack *extack)
721{
722 struct rtvia *via = nla_data(nla);
723 int err = -EINVAL;
724 int alen;
725
726 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
727 NL_SET_ERR_MSG_ATTR(extack, nla,
728 "Invalid attribute length for RTA_VIA");
729 goto errout;
730 }
731 alen = nla_len(nla) -
732 offsetof(struct rtvia, rtvia_addr);
733 if (alen > MAX_VIA_ALEN) {
734 NL_SET_ERR_MSG_ATTR(extack, nla,
735 "Invalid address length for RTA_VIA");
736 goto errout;
737 }
738
739 /* Validate the address family */
740 switch (via->rtvia_family) {
741 case AF_PACKET:
742 *via_table = NEIGH_LINK_TABLE;
743 break;
744 case AF_INET:
745 *via_table = NEIGH_ARP_TABLE;
746 if (alen != 4)
747 goto errout;
748 break;
749 case AF_INET6:
750 *via_table = NEIGH_ND_TABLE;
751 if (alen != 16)
752 goto errout;
753 break;
754 default:
755 /* Unsupported address family */
756 goto errout;
757 }
758
759 memcpy(via_addr, via->rtvia_addr, alen);
760 *via_alen = alen;
761 err = 0;
762
763errout:
764 return err;
765}
766
f8efb73c
RP		 767static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
768 struct mpls_route *rt)
769{
770 struct net *net = cfg->rc_nlinfo.nl_net;
771 struct mpls_nh *nh = rt->rt_nh;
772 int err;
773 int i;
774
775 if (!nh)
776 return -ENOMEM;
777
f8efb73c
RP		 778 nh->nh_labels = cfg->rc_output_labels;
779 for (i = 0; i < nh->nh_labels; i++)
780 nh->nh_label[i] = cfg->rc_output_label[i];
781
782 nh->nh_via_table = cfg->rc_via_table;
cf4b24f0 783 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
f8efb73c
RP		 784 nh->nh_via_alen = cfg->rc_via_alen;
785
cf4b24f0 786 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
f8efb73c
RP		 787 if (err)
788 goto errout;
789
c89359a4
RP		 790 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
791 rt->rt_nhn_alive--;
792
f8efb73c
RP		 793 return 0;
794
795errout:
796 return err;
797}
798
cf4b24f0 799static int mpls_nh_build(struct net *net, struct mpls_route *rt,
c89359a4 800 struct mpls_nh *nh, int oif, struct nlattr *via,
074350e2
DA		 801 struct nlattr *newdst, u8 max_labels,
802 struct netlink_ext_ack *extack)
f8efb73c
RP		 803{
804 int err = -ENOMEM;
805
806 if (!nh)
807 goto errout;
808
809 if (newdst) {
a1f10abe 810 err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
074350e2 811 nh->nh_label, extack);
f8efb73c
RP		 812 if (err)
813 goto errout;
814 }
815
f20367df
RS		 816 if (via) {
817 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
074350e2 818 __mpls_nh_via(rt, nh), extack);
f20367df
RS		 819 if (err)
820 goto errout;
821 } else {
822 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
823 }
f8efb73c 824
cf4b24f0 825 err = mpls_nh_assign_dev(net, rt, nh, oif);
f8efb73c
RP		 826 if (err)
827 goto errout;
828
829 return 0;
830
831errout:
832 return err;
833}
834
77ef013a 835static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
a4ac8c98
DA		 836 u8 cfg_via_alen, u8 *max_via_alen,
837 u8 *max_labels)
f8efb73c 838{
f8efb73c 839 int remaining = len;
77ef013a 840 u8 nhs = 0;
f8efb73c 841
cf4b24f0 842 *max_via_alen = 0;
a4ac8c98 843 *max_labels = 0;
cf4b24f0 844
f8efb73c 845 while (rtnh_ok(rtnh, remaining)) {
cf4b24f0
RS		 846 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
847 int attrlen;
a4ac8c98 848 u8 n_labels = 0;
cf4b24f0
RS		 849
850 attrlen = rtnh_attrlen(rtnh);
851 nla = nla_find(attrs, attrlen, RTA_VIA);
852 if (nla && nla_len(nla) >=
853 offsetof(struct rtvia, rtvia_addr)) {
854 int via_alen = nla_len(nla) -
855 offsetof(struct rtvia, rtvia_addr);
856
857 if (via_alen <= MAX_VIA_ALEN)
858 *max_via_alen = max_t(u16, *max_via_alen,
859 via_alen);
860 }
861
a4ac8c98
DA		 862 nla = nla_find(attrs, attrlen, RTA_NEWDST);
863 if (nla &&
a1f10abe
DA		 864 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
865 NULL, NULL) != 0)
a4ac8c98
DA		 866 return 0;
867
868 *max_labels = max_t(u8, *max_labels, n_labels);
869
77ef013a
DA		 870 /* number of nexthops is tracked by a u8.
871 * Check for overflow.
872 */
873 if (nhs == 255)
874 return 0;
f8efb73c 875 nhs++;
77ef013a 876
f8efb73c
RP		 877 rtnh = rtnh_next(rtnh, &remaining);
878 }
879
880 /* leftover implies invalid nexthop configuration, discard it */
881 return remaining > 0 ? 0 : nhs;
882}
883
884static int mpls_nh_build_multi(struct mpls_route_config *cfg,
074350e2
DA		 885 struct mpls_route *rt, u8 max_labels,
886 struct netlink_ext_ack *extack)
f8efb73c
RP		 887{
888 struct rtnexthop *rtnh = cfg->rc_mp;
889 struct nlattr *nla_via, *nla_newdst;
890 int remaining = cfg->rc_mp_len;
f8efb73c 891 int err = 0;
77ef013a 892 u8 nhs = 0;
f8efb73c
RP		 893
894 change_nexthops(rt) {
895 int attrlen;
896
897 nla_via = NULL;
898 nla_newdst = NULL;
899
900 err = -EINVAL;
901 if (!rtnh_ok(rtnh, remaining))
902 goto errout;
903
1c78efa8
RS		 904 /* neither weighted multipath nor any flags
905 * are supported
906 */
907 if (rtnh->rtnh_hops || rtnh->rtnh_flags)
908 goto errout;
909
f8efb73c
RP		 910 attrlen = rtnh_attrlen(rtnh);
911 if (attrlen > 0) {
912 struct nlattr *attrs = rtnh_attrs(rtnh);
913
914 nla_via = nla_find(attrs, attrlen, RTA_VIA);
915 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
916 }
917
cf4b24f0 918 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
a4ac8c98 919 rtnh->rtnh_ifindex, nla_via, nla_newdst,
074350e2 920 max_labels, extack);
f8efb73c
RP		 921 if (err)
922 goto errout;
923
c89359a4
RP		 924 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
925 rt->rt_nhn_alive--;
926
f8efb73c
RP		 927 rtnh = rtnh_next(rtnh, &remaining);
928 nhs++;
929 } endfor_nexthops(rt);
930
931 rt->rt_nhn = nhs;
932
933 return 0;
934
935errout:
936 return err;
937}
938
3968523f 939static bool mpls_label_ok(struct net *net, unsigned int *index,
074350e2 940 struct netlink_ext_ack *extack)
b7b386f4 941{
3968523f
DW		 942 bool is_ok = true;
943
b7b386f4 944 /* Reserved labels may not be set */
3968523f 945 if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
074350e2
DA		 946 NL_SET_ERR_MSG(extack,
947 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
3968523f 948 is_ok = false;
074350e2 949 }
b7b386f4
DA		 950
951 /* The full 20 bit range may not be supported. */
3968523f 952 if (is_ok && *index >= net->mpls.platform_labels) {
074350e2
DA		 953 NL_SET_ERR_MSG(extack,
954 "Label >= configured maximum in platform_labels");
3968523f 955 is_ok = false;
074350e2 956 }
b7b386f4 957
3968523f
DW		 958 *index = array_index_nospec(*index, net->mpls.platform_labels);
959 return is_ok;
b7b386f4
DA		 960}
961
074350e2
DA		 962static int mpls_route_add(struct mpls_route_config *cfg,
963 struct netlink_ext_ack *extack)
a2519929 964{
19d0c341 965 struct mpls_route __rcu **platform_label;
a2519929 966 struct net *net = cfg->rc_nlinfo.nl_net;
a2519929 967 struct mpls_route *rt, *old;
a2519929 968 int err = -EINVAL;
cf4b24f0 969 u8 max_via_alen;
f8efb73c 970 unsigned index;
a4ac8c98 971 u8 max_labels;
77ef013a 972 u8 nhs;
a2519929
EB		 973
974 index = cfg->rc_label;
975
976 /* If a label was not specified during insert pick one */
977 if ((index == LABEL_NOT_SPECIFIED) &&
978 (cfg->rc_nlflags & NLM_F_CREATE)) {
979 index = find_free_label(net);
980 }
981
3968523f 982 if (!mpls_label_ok(net, &index, extack))
a2519929
EB		 983 goto errout;
984
a2519929 985 /* Append makes no sense with mpls */
0f7bbd58 986 err = -EOPNOTSUPP;
074350e2
DA		 987 if (cfg->rc_nlflags & NLM_F_APPEND) {
988 NL_SET_ERR_MSG(extack, "MPLS does not support route append");
a2519929 989 goto errout;
074350e2 990 }
a2519929
EB		 991
992 err = -EEXIST;
19d0c341
EB		 993 platform_label = rtnl_dereference(net->mpls.platform_label);
994 old = rtnl_dereference(platform_label[index]);
a2519929
EB		 995 if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
996 goto errout;
997
998 err = -EEXIST;
999 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
1000 goto errout;
1001
1002 err = -ENOENT;
1003 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
1004 goto errout;
1005
cf4b24f0 1006 err = -EINVAL;
a4ac8c98
DA		 1007 if (cfg->rc_mp) {
1008 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
1009 cfg->rc_via_alen, &max_via_alen,
1010 &max_labels);
1011 } else {
1012 max_via_alen = cfg->rc_via_alen;
1013 max_labels = cfg->rc_output_labels;
1014 nhs = 1;
1015 }
1016
074350e2
DA		 1017 if (nhs == 0) {
1018 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
cf4b24f0 1019 goto errout;
074350e2 1020 }
f8efb73c 1021
a2519929 1022 err = -ENOMEM;
a4ac8c98 1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
df1c6316
DA		 1024 if (IS_ERR(rt)) {
1025 err = PTR_ERR(rt);
a2519929 1026 goto errout;
df1c6316 1027 }
a2519929 1028
a2519929 1029 rt->rt_protocol = cfg->rc_protocol;
118d5234 1030 rt->rt_payload_type = cfg->rc_payload_type;
5b441ac8 1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
a2519929 1032
f8efb73c 1033 if (cfg->rc_mp)
074350e2 1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
f8efb73c
RP		 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);
a2519929 1041
a2519929
EB		 1042 return 0;
1043
f8efb73c
RP		 1044freert:
1045 mpls_rt_free(rt);
a2519929 1046errout:
a2519929
EB		 1047 return err;
1048}
1049
074350e2
DA		 1050static int mpls_route_del(struct mpls_route_config *cfg,
1051 struct netlink_ext_ack *extack)
a2519929
EB		 1052{
1053 struct net *net = cfg->rc_nlinfo.nl_net;
1054 unsigned index;
1055 int err = -EINVAL;
1056
1057 index = cfg->rc_label;
1058
3968523f 1059 if (!mpls_label_ok(net, &index, extack))
a2519929
EB		 1060 goto errout;
1061
f8efb73c 1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
a2519929
EB		 1063
1064 err = 0;
1065errout:
1066 return err;
1067}
1068
27d69105
RS		 1069static void mpls_get_stats(struct mpls_dev *mdev,
1070 struct mpls_link_stats *stats)
1071{
1072 struct mpls_pcpu_stats *p;
1073 int i;
1074
1075 memset(stats, 0, sizeof(*stats));
1076
1077 for_each_possible_cpu(i) {
1078 struct mpls_link_stats local;
1079 unsigned int start;
1080
1081 p = per_cpu_ptr(mdev->stats, i);
1082 do {
1083 start = u64_stats_fetch_begin(&p->syncp);
1084 local = p->stats;
1085 } while (u64_stats_fetch_retry(&p->syncp, start));
1086
1087 stats->rx_packets += local.rx_packets;
1088 stats->rx_bytes += local.rx_bytes;
1089 stats->tx_packets += local.tx_packets;
1090 stats->tx_bytes += local.tx_bytes;
1091 stats->rx_errors += local.rx_errors;
1092 stats->tx_errors += local.tx_errors;
1093 stats->rx_dropped += local.rx_dropped;
1094 stats->tx_dropped += local.tx_dropped;
1095 stats->rx_noroute += local.rx_noroute;
1096 }
1097}
1098
1099static int mpls_fill_stats_af(struct sk_buff *skb,
1100 const struct net_device *dev)
1101{
1102 struct mpls_link_stats *stats;
1103 struct mpls_dev *mdev;
1104 struct nlattr *nla;
1105
1106 mdev = mpls_dev_get(dev);
1107 if (!mdev)
1108 return -ENODATA;
1109
1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
1111 sizeof(struct mpls_link_stats),
1112 MPLS_STATS_UNSPEC);
1113 if (!nla)
1114 return -EMSGSIZE;
1115
1116 stats = nla_data(nla);
1117 mpls_get_stats(mdev, stats);
1118
1119 return 0;
1120}
1121
1122static size_t mpls_get_stats_af_size(const struct net_device *dev)
1123{
1124 struct mpls_dev *mdev;
1125
1126 mdev = mpls_dev_get(dev);
1127 if (!mdev)
1128 return 0;
1129
1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats));
1131}
1132
24045a03
DA		 1133static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
1134 u32 portid, u32 seq, int event,
1135 unsigned int flags, int type)
1136{
1137 struct nlmsghdr *nlh;
1138 struct netconfmsg *ncm;
1139 bool all = false;
1140
1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1142 flags);
1143 if (!nlh)
1144 return -EMSGSIZE;
1145
1146 if (type == NETCONFA_ALL)
1147 all = true;
1148
1149 ncm = nlmsg_data(nlh);
1150 ncm->ncm_family = AF_MPLS;
1151
1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
1153 goto nla_put_failure;
1154
1155 if ((all || type == NETCONFA_INPUT) &&
1156 nla_put_s32(skb, NETCONFA_INPUT,
1157 mdev->input_enabled) < 0)
1158 goto nla_put_failure;
1159
1160 nlmsg_end(skb, nlh);
1161 return 0;
1162
1163nla_put_failure:
1164 nlmsg_cancel(skb, nlh);
1165 return -EMSGSIZE;
1166}
1167
1168static int mpls_netconf_msgsize_devconf(int type)
1169{
1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1171 + nla_total_size(4); /* NETCONFA_IFINDEX */
1172 bool all = false;
1173
1174 if (type == NETCONFA_ALL)
1175 all = true;
1176
1177 if (all || type == NETCONFA_INPUT)
1178 size += nla_total_size(4);
1179
1180 return size;
1181}
1182
823566ae
DA		 1183static void mpls_netconf_notify_devconf(struct net *net, int event,
1184 int type, struct mpls_dev *mdev)
24045a03
DA		 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
823566ae 1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
24045a03
DA		 1194 if (err < 0) {
1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1196 WARN_ON(err == -EMSGSIZE);
1197 kfree_skb(skb);
1198 goto errout;
1199 }
1200
1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
1202 return;
1203errout:
1204 if (err < 0)
1205 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
1206}
1207
1208static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
1209 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1210};
1211
1212static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 1213 struct nlmsghdr *nlh,
1214 struct netlink_ext_ack *extack)
24045a03
DA		 1215{
1216 struct net *net = sock_net(in_skb->sk);
1217 struct nlattr *tb[NETCONFA_MAX + 1];
1218 struct netconfmsg *ncm;
1219 struct net_device *dev;
1220 struct mpls_dev *mdev;
1221 struct sk_buff *skb;
1222 int ifindex;
1223 int err;
1224
1225 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
dac9c979 1226 devconf_mpls_policy, extack);
24045a03
DA		 1227 if (err < 0)
1228 goto errout;
1229
1230 err = -EINVAL;
1231 if (!tb[NETCONFA_IFINDEX])
1232 goto errout;
1233
1234 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1235 dev = __dev_get_by_index(net, ifindex);
1236 if (!dev)
1237 goto errout;
1238
1239 mdev = mpls_dev_get(dev);
1240 if (!mdev)
1241 goto errout;
1242
1243 err = -ENOBUFS;
1244 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1245 if (!skb)
1246 goto errout;
1247
1248 err = mpls_netconf_fill_devconf(skb, mdev,
1249 NETLINK_CB(in_skb).portid,
1250 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1251 NETCONFA_ALL);
1252 if (err < 0) {
1253 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
1254 WARN_ON(err == -EMSGSIZE);
1255 kfree_skb(skb);
1256 goto errout;
1257 }
1258 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1259errout:
1260 return err;
1261}
1262
1263static int mpls_netconf_dump_devconf(struct sk_buff *skb,
1264 struct netlink_callback *cb)
1265{
addd383f 1266 const struct nlmsghdr *nlh = cb->nlh;
24045a03
DA		 1267 struct net *net = sock_net(skb->sk);
1268 struct hlist_head *head;
1269 struct net_device *dev;
1270 struct mpls_dev *mdev;
1271 int idx, s_idx;
1272 int h, s_h;
1273
addd383f
DA		 1274 if (cb->strict_check) {
1275 struct netlink_ext_ack *extack = cb->extack;
1276 struct netconfmsg *ncm;
1277
1278 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
1279 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
1280 return -EINVAL;
1281 }
1282
1283 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
1284 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
1285 return -EINVAL;
1286 }
1287 }
1288
24045a03
DA		 1289 s_h = cb->args[0];
1290 s_idx = idx = cb->args[1];
1291
1292 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1293 idx = 0;
1294 head = &net->dev_index_head[h];
1295 rcu_read_lock();
1296 cb->seq = net->dev_base_seq;
1297 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1298 if (idx < s_idx)
1299 goto cont;
1300 mdev = mpls_dev_get(dev);
1301 if (!mdev)
1302 goto cont;
1303 if (mpls_netconf_fill_devconf(skb, mdev,
1304 NETLINK_CB(cb->skb).portid,
addd383f 1305 nlh->nlmsg_seq,
24045a03
DA		 1306 RTM_NEWNETCONF,
1307 NLM_F_MULTI,
1308 NETCONFA_ALL) < 0) {
1309 rcu_read_unlock();
1310 goto done;
1311 }
1312 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1313cont:
1314 idx++;
1315 }
1316 rcu_read_unlock();
1317 }
1318done:
1319 cb->args[0] = h;
1320 cb->args[1] = idx;
1321
1322 return skb->len;
1323}
1324
37bde799
RS		 1325#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
1326 (&((struct mpls_dev *)0)->field)
1327
24045a03
DA		 1328static int mpls_conf_proc(struct ctl_table *ctl, int write,
1329 void __user *buffer,
1330 size_t *lenp, loff_t *ppos)
1331{
1332 int oval = *(int *)ctl->data;
1333 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1334
1335 if (write) {
1336 struct mpls_dev *mdev = ctl->extra1;
1337 int i = (int *)ctl->data - (int *)mdev;
1338 struct net *net = ctl->extra2;
1339 int val = *(int *)ctl->data;
1340
1341 if (i == offsetof(struct mpls_dev, input_enabled) &&
1342 val != oval) {
823566ae
DA		 1343 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
1344 NETCONFA_INPUT, mdev);
24045a03
DA		 1345 }
1346 }
1347
1348 return ret;
1349}
1350
37bde799
RS		 1351static const struct ctl_table mpls_dev_table[] = {
1352 {
1353 .procname = "input",
1354 .maxlen = sizeof(int),
1355 .mode = 0644,
24045a03 1356 .proc_handler = mpls_conf_proc,
37bde799
RS		 1357 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
1358 },
1359 { }
1360};
1361
1362static int mpls_dev_sysctl_register(struct net_device *dev,
1363 struct mpls_dev *mdev)
1364{
1365 char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
24045a03 1366 struct net *net = dev_net(dev);
37bde799
RS		 1367 struct ctl_table *table;
1368 int i;
1369
1370 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
1371 if (!table)
1372 goto out;
1373
1374 /* Table data contains only offsets relative to the base of
1375 * the mdev at this point, so make them absolute.
1376 */
24045a03 1377 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
37bde799 1378 table[i].data = (char *)mdev + (uintptr_t)table[i].data;
24045a03
DA		 1379 table[i].extra1 = mdev;
1380 table[i].extra2 = net;
1381 }
37bde799
RS		 1382
1383 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
1384
1182e4d0 1385 mdev->sysctl = register_net_sysctl(net, path, table);
37bde799
RS		 1386 if (!mdev->sysctl)
1387 goto free;
1388
1182e4d0 1389 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
37bde799
RS		 1390 return 0;
1391
1392free:
1393 kfree(table);
1394out:
1395 return -ENOBUFS;
1396}
1397
1182e4d0
DA		 1398static void mpls_dev_sysctl_unregister(struct net_device *dev,
1399 struct mpls_dev *mdev)
37bde799 1400{
1182e4d0 1401 struct net *net = dev_net(dev);
37bde799
RS		 1402 struct ctl_table *table;
1403
1404 table = mdev->sysctl->ctl_table_arg;
1405 unregister_net_sysctl_table(mdev->sysctl);
1406 kfree(table);
1182e4d0
DA		 1407
1408 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
37bde799
RS		 1409}
1410
03c57747
RS		 1411static struct mpls_dev *mpls_add_dev(struct net_device *dev)
1412{
1413 struct mpls_dev *mdev;
1414 int err = -ENOMEM;
27d69105 1415 int i;
03c57747
RS		 1416
1417 ASSERT_RTNL();
1418
1419 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1420 if (!mdev)
1421 return ERR_PTR(err);
1422
27d69105
RS		 1423 mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
1424 if (!mdev->stats)
1425 goto free;
1426
1427 for_each_possible_cpu(i) {
1428 struct mpls_pcpu_stats *mpls_stats;
1429
1430 mpls_stats = per_cpu_ptr(mdev->stats, i);
1431 u64_stats_init(&mpls_stats->syncp);
1432 }
1433
1182e4d0
DA		 1434 mdev->dev = dev;
1435
37bde799
RS		 1436 err = mpls_dev_sysctl_register(dev, mdev);
1437 if (err)
1438 goto free;
1439
03c57747
RS		 1440 rcu_assign_pointer(dev->mpls_ptr, mdev);
1441
1442 return mdev;
37bde799
RS		 1443
1444free:
27d69105 1445 free_percpu(mdev->stats);
37bde799
RS		 1446 kfree(mdev);
1447 return ERR_PTR(err);
03c57747
RS		 1448}
1449
27d69105
RS		 1450static void mpls_dev_destroy_rcu(struct rcu_head *head)
1451{
1452 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
1453
1454 free_percpu(mdev->stats);
1455 kfree(mdev);
1456}
1457
c89359a4 1458static void mpls_ifdown(struct net_device *dev, int event)
0189197f 1459{
19d0c341 1460 struct mpls_route __rcu **platform_label;
0189197f 1461 struct net *net = dev_net(dev);
77ef013a 1462 u8 alive, deleted;
0189197f
EB		 1463 unsigned index;
1464
19d0c341 1465 platform_label = rtnl_dereference(net->mpls.platform_label);
0189197f 1466 for (index = 0; index < net->mpls.platform_labels; index++) {
19d0c341 1467 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
c89359a4 1468
0189197f
EB		 1469 if (!rt)
1470 continue;
c89359a4 1471
61733c91 1472 alive = 0;
4ea8efad 1473 deleted = 0;
c89359a4 1474 change_nexthops(rt) {
39eb8cd1
DA		 1475 unsigned int nh_flags = nh->nh_flags;
1476
f8efb73c 1477 if (rtnl_dereference(nh->nh_dev) != dev)
61733c91
DA		 1478 goto next;
1479
c89359a4
RP		 1480 switch (event) {
1481 case NETDEV_DOWN:
1482 case NETDEV_UNREGISTER:
39eb8cd1 1483 nh_flags |= RTNH_F_DEAD;
c89359a4
RP		 1484 /* fall through */
1485 case NETDEV_CHANGE:
39eb8cd1 1486 nh_flags |= RTNH_F_LINKDOWN;
c89359a4
RP		 1487 break;
1488 }
1489 if (event == NETDEV_UNREGISTER)
1490 RCU_INIT_POINTER(nh->nh_dev, NULL);
39eb8cd1
DA		 1491
1492 if (nh->nh_flags != nh_flags)
1493 WRITE_ONCE(nh->nh_flags, nh_flags);
61733c91 1494next:
39eb8cd1 1495 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
61733c91 1496 alive++;
4ea8efad
DA		 1497 if (!rtnl_dereference(nh->nh_dev))
1498 deleted++;
f8efb73c 1499 } endfor_nexthops(rt);
61733c91
DA		 1500
1501 WRITE_ONCE(rt->rt_nhn_alive, alive);
4ea8efad
DA		 1502
1503 /* if there are no more nexthops, delete the route */
1504 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
1505 mpls_route_update(net, index, NULL, NULL);
0189197f 1506 }
c89359a4
RP		 1507}
1508
39eb8cd1 1509static void mpls_ifup(struct net_device *dev, unsigned int flags)
c89359a4
RP		 1510{
1511 struct mpls_route __rcu **platform_label;
1512 struct net *net = dev_net(dev);
1513 unsigned index;
77ef013a 1514 u8 alive;
c89359a4
RP		 1515
1516 platform_label = rtnl_dereference(net->mpls.platform_label);
1517 for (index = 0; index < net->mpls.platform_labels; index++) {
1518 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
1519
1520 if (!rt)
1521 continue;
37bde799 1522
c89359a4
RP		 1523 alive = 0;
1524 change_nexthops(rt) {
39eb8cd1 1525 unsigned int nh_flags = nh->nh_flags;
c89359a4
RP		 1526 struct net_device *nh_dev =
1527 rtnl_dereference(nh->nh_dev);
03c57747 1528
39eb8cd1 1529 if (!(nh_flags & flags)) {
c89359a4
RP		 1530 alive++;
1531 continue;
1532 }
1533 if (nh_dev != dev)
1534 continue;
1535 alive++;
39eb8cd1 1536 nh_flags &= ~flags;
c2e8471d 1537 WRITE_ONCE(nh->nh_flags, nh_flags);
c89359a4
RP		 1538 } endfor_nexthops(rt);
1539
39eb8cd1 1540 WRITE_ONCE(rt->rt_nhn_alive, alive);
c89359a4 1541 }
0189197f
EB		 1542}
1543
1544static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
1545 void *ptr)
1546{
1547 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
03c57747 1548 struct mpls_dev *mdev;
c89359a4 1549 unsigned int flags;
0189197f 1550
c89359a4 1551 if (event == NETDEV_REGISTER) {
d8e2262a
SH		 1552
1553 /* For now just support Ethernet, IPGRE, IP6GRE, SIT and
1554 * IPIP devices
1555 */
0d227a86
SH		 1556 if (dev->type == ARPHRD_ETHER ||
1557 dev->type == ARPHRD_LOOPBACK ||
407f31be 1558 dev->type == ARPHRD_IPGRE ||
d8e2262a 1559 dev->type == ARPHRD_IP6GRE ||
407f31be
SH		 1560 dev->type == ARPHRD_SIT ||
1561 dev->type == ARPHRD_TUNNEL) {
03c57747
RS		 1562 mdev = mpls_add_dev(dev);
1563 if (IS_ERR(mdev))
1564 return notifier_from_errno(PTR_ERR(mdev));
1565 }
c89359a4
RP		 1566 return NOTIFY_OK;
1567 }
03c57747 1568
c89359a4
RP		 1569 mdev = mpls_dev_get(dev);
1570 if (!mdev)
1571 return NOTIFY_OK;
1572
1573 switch (event) {
1574 case NETDEV_DOWN:
1575 mpls_ifdown(dev, event);
1576 break;
1577 case NETDEV_UP:
1578 flags = dev_get_flags(dev);
1579 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1580 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1581 else
1582 mpls_ifup(dev, RTNH_F_DEAD);
1583 break;
1584 case NETDEV_CHANGE:
1585 flags = dev_get_flags(dev);
1586 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1587 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
1588 else
1589 mpls_ifdown(dev, event);
1590 break;
0189197f 1591 case NETDEV_UNREGISTER:
c89359a4
RP		 1592 mpls_ifdown(dev, event);
1593 mdev = mpls_dev_get(dev);
1594 if (mdev) {
1182e4d0 1595 mpls_dev_sysctl_unregister(dev, mdev);
c89359a4 1596 RCU_INIT_POINTER(dev->mpls_ptr, NULL);
27d69105 1597 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
c89359a4 1598 }
0189197f 1599 break;
0fae3bf0
RS		 1600 case NETDEV_CHANGENAME:
1601 mdev = mpls_dev_get(dev);
1602 if (mdev) {
1603 int err;
1604
1182e4d0 1605 mpls_dev_sysctl_unregister(dev, mdev);
0fae3bf0
RS		 1606 err = mpls_dev_sysctl_register(dev, mdev);
1607 if (err)
1608 return notifier_from_errno(err);
1609 }
1610 break;
0189197f
EB		 1611 }
1612 return NOTIFY_OK;
1613}
1614
1615static struct notifier_block mpls_dev_notifier = {
1616 .notifier_call = mpls_dev_notify,
1617};
1618
03c05665 1619static int nla_put_via(struct sk_buff *skb,
b79bda3d 1620 u8 table, const void *addr, int alen)
03c05665 1621{
b79bda3d
EB		 1622 static const int table_to_family[NEIGH_NR_TABLES + 1] = {
1623 AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
1624 };
03c05665
EB		 1625 struct nlattr *nla;
1626 struct rtvia *via;
b79bda3d 1627 int family = AF_UNSPEC;
03c05665
EB		 1628
1629 nla = nla_reserve(skb, RTA_VIA, alen + 2);
1630 if (!nla)
1631 return -EMSGSIZE;
1632
b79bda3d
EB		 1633 if (table <= NEIGH_NR_TABLES)
1634 family = table_to_family[table];
1635
03c05665
EB		 1636 via = nla_data(nla);
1637 via->rtvia_family = family;
1638 memcpy(via->rtvia_addr, addr, alen);
1639 return 0;
1640}
1641
966bae33
EB		 1642int nla_put_labels(struct sk_buff *skb, int attrtype,
1643 u8 labels, const u32 label[])
1644{
1645 struct nlattr *nla;
1646 struct mpls_shim_hdr *nla_label;
1647 bool bos;
1648 int i;
1649 nla = nla_reserve(skb, attrtype, labels*4);
1650 if (!nla)
1651 return -EMSGSIZE;
1652
1653 nla_label = nla_data(nla);
1654 bos = true;
1655 for (i = labels - 1; i >= 0; i--) {
1656 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
1657 bos = false;
1658 }
1659
1660 return 0;
1661}
face0188 1662EXPORT_SYMBOL_GPL(nla_put_labels);
966bae33 1663
a1f10abe
DA		 1664int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
1665 u32 label[], struct netlink_ext_ack *extack)
966bae33
EB		 1666{
1667 unsigned len = nla_len(nla);
966bae33 1668 struct mpls_shim_hdr *nla_label;
a4ac8c98 1669 u8 nla_labels;
966bae33
EB		 1670 bool bos;
1671 int i;
1672
a4ac8c98
DA		 1673 /* len needs to be an even multiple of 4 (the label size). Number
1674 * of labels is a u8 so check for overflow.
1675 */
a1f10abe
DA		 1676 if (len & 3 || len / 4 > 255) {
1677 NL_SET_ERR_MSG_ATTR(extack, nla,
1678 "Invalid length for labels attribute");
966bae33 1679 return -EINVAL;
a1f10abe 1680 }
966bae33
EB		 1681
1682 /* Limit the number of new labels allowed */
1683 nla_labels = len/4;
a1f10abe
DA		 1684 if (nla_labels > max_labels) {
1685 NL_SET_ERR_MSG(extack, "Too many labels");
966bae33 1686 return -EINVAL;
a1f10abe 1687 }
966bae33 1688
a4ac8c98
DA		 1689 /* when label == NULL, caller wants number of labels */
1690 if (!label)
1691 goto out;
1692
966bae33
EB		 1693 nla_label = nla_data(nla);
1694 bos = true;
1695 for (i = nla_labels - 1; i >= 0; i--, bos = false) {
1696 struct mpls_entry_decoded dec;
1697 dec = mpls_entry_decode(nla_label + i);
1698
1699 /* Ensure the bottom of stack flag is properly set
1700 * and ttl and tc are both clear.
1701 */
a1f10abe
DA		 1702 if (dec.ttl) {
1703 NL_SET_ERR_MSG_ATTR(extack, nla,
1704 "TTL in label must be 0");
1705 return -EINVAL;
1706 }
1707
1708 if (dec.tc) {
1709 NL_SET_ERR_MSG_ATTR(extack, nla,
1710 "Traffic class in label must be 0");
966bae33 1711 return -EINVAL;
a1f10abe
DA		 1712 }
1713
1714 if (dec.bos != bos) {
1715 NL_SET_BAD_ATTR(extack, nla);
1716 if (bos) {
1717 NL_SET_ERR_MSG(extack,
1718 "BOS bit must be set in first label");
1719 } else {
1720 NL_SET_ERR_MSG(extack,
1721 "BOS bit can only be set in first label");
1722 }
1723 return -EINVAL;
1724 }
966bae33 1725
5a9ab017 1726 switch (dec.label) {
78f5b899 1727 case MPLS_LABEL_IMPLNULL:
5a9ab017
RS		 1728 /* RFC3032: This is a label that an LSR may
1729 * assign and distribute, but which never
1730 * actually appears in the encapsulation.
1731 */
a1f10abe
DA		 1732 NL_SET_ERR_MSG_ATTR(extack, nla,
1733 "Implicit NULL Label (3) can not be used in encapsulation");
5a9ab017
RS		 1734 return -EINVAL;
1735 }
1736
966bae33
EB		 1737 label[i] = dec.label;
1738 }
a4ac8c98 1739out:
966bae33
EB		 1740 *labels = nla_labels;
1741 return 0;
1742}
face0188 1743EXPORT_SYMBOL_GPL(nla_get_labels);
966bae33 1744
074350e2
DA		 1745static int rtm_to_route_config(struct sk_buff *skb,
1746 struct nlmsghdr *nlh,
1747 struct mpls_route_config *cfg,
1748 struct netlink_ext_ack *extack)
03c05665
EB		 1749{
1750 struct rtmsg *rtm;
1751 struct nlattr *tb[RTA_MAX+1];
1752 int index;
1753 int err;
1754
fceb6435 1755 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy,
074350e2 1756 extack);
03c05665
EB		 1757 if (err < 0)
1758 goto errout;
1759
1760 err = -EINVAL;
1761 rtm = nlmsg_data(nlh);
03c05665 1762
074350e2
DA		 1763 if (rtm->rtm_family != AF_MPLS) {
1764 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
03c05665 1765 goto errout;
074350e2
DA		 1766 }
1767 if (rtm->rtm_dst_len != 20) {
1768 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
03c05665 1769 goto errout;
074350e2
DA		 1770 }
1771 if (rtm->rtm_src_len != 0) {
1772 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
03c05665 1773 goto errout;
074350e2
DA		 1774 }
1775 if (rtm->rtm_tos != 0) {
1776 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
03c05665 1777 goto errout;
074350e2
DA		 1778 }
1779 if (rtm->rtm_table != RT_TABLE_MAIN) {
1780 NL_SET_ERR_MSG(extack,
1781 "MPLS only supports the main route table");
03c05665 1782 goto errout;
074350e2 1783 }
03c05665
EB		 1784 /* Any value is acceptable for rtm_protocol */
1785
1786 /* As mpls uses destination specific addresses
1787 * (or source specific address in the case of multicast)
1788 * all addresses have universal scope.
1789 */
074350e2
DA		 1790 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
1791 NL_SET_ERR_MSG(extack,
1792 "Invalid route scope - MPLS only supports UNIVERSE");
03c05665 1793 goto errout;
074350e2
DA		 1794 }
1795 if (rtm->rtm_type != RTN_UNICAST) {
1796 NL_SET_ERR_MSG(extack,
1797 "Invalid route type - MPLS only supports UNICAST");
03c05665 1798 goto errout;
074350e2
DA		 1799 }
1800 if (rtm->rtm_flags != 0) {
1801 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
03c05665 1802 goto errout;
074350e2 1803 }
03c05665
EB		 1804
1805 cfg->rc_label = LABEL_NOT_SPECIFIED;
1806 cfg->rc_protocol = rtm->rtm_protocol;
eb7809f0 1807 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
5b441ac8 1808 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
03c05665
EB		 1809 cfg->rc_nlflags = nlh->nlmsg_flags;
1810 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
1811 cfg->rc_nlinfo.nlh = nlh;
1812 cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
1813
1814 for (index = 0; index <= RTA_MAX; index++) {
1815 struct nlattr *nla = tb[index];
1816 if (!nla)
1817 continue;
1818
14dd3e1b 1819 switch (index) {
03c05665
EB		 1820 case RTA_OIF:
1821 cfg->rc_ifindex = nla_get_u32(nla);
1822 break;
1823 case RTA_NEWDST:
1824 if (nla_get_labels(nla, MAX_NEW_LABELS,
1825 &cfg->rc_output_labels,
074350e2 1826 cfg->rc_output_label, extack))
03c05665
EB		 1827 goto errout;
1828 break;
1829 case RTA_DST:
1830 {
f8efb73c 1831 u8 label_count;
03c05665 1832 if (nla_get_labels(nla, 1, &label_count,
074350e2 1833 &cfg->rc_label, extack))
03c05665
EB		 1834 goto errout;
1835
b7b386f4 1836 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
3968523f 1837 &cfg->rc_label, extack))
03c05665 1838 goto errout;
03c05665
EB		 1839 break;
1840 }
1841 case RTA_VIA:
1842 {
f8efb73c 1843 if (nla_get_via(nla, &cfg->rc_via_alen,
074350e2
DA		 1844 &cfg->rc_via_table, cfg->rc_via,
1845 extack))
03c05665 1846 goto errout;
f8efb73c
RP		 1847 break;
1848 }
1849 case RTA_MULTIPATH:
1850 {
1851 cfg->rc_mp = nla_data(nla);
1852 cfg->rc_mp_len = nla_len(nla);
03c05665
EB		 1853 break;
1854 }
5b441ac8
RS		 1855 case RTA_TTL_PROPAGATE:
1856 {
1857 u8 ttl_propagate = nla_get_u8(nla);
1858
074350e2
DA		 1859 if (ttl_propagate > 1) {
1860 NL_SET_ERR_MSG_ATTR(extack, nla,
1861 "RTA_TTL_PROPAGATE can only be 0 or 1");
5b441ac8 1862 goto errout;
074350e2 1863 }
5b441ac8
RS		 1864 cfg->rc_ttl_propagate = ttl_propagate ?
1865 MPLS_TTL_PROP_ENABLED :
1866 MPLS_TTL_PROP_DISABLED;
1867 break;
1868 }
03c05665 1869 default:
074350e2 1870 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
03c05665
EB		 1871 /* Unsupported attribute */
1872 goto errout;
1873 }
1874 }
1875
1876 err = 0;
1877errout:
1878 return err;
1879}
1880
c21ef3e3
DA		 1881static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1882 struct netlink_ext_ack *extack)
03c05665 1883{
a4ac8c98 1884 struct mpls_route_config *cfg;
03c05665
EB		 1885 int err;
1886
a4ac8c98
DA		 1887 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1888 if (!cfg)
1889 return -ENOMEM;
1890
074350e2 1891 err = rtm_to_route_config(skb, nlh, cfg, extack);
03c05665 1892 if (err < 0)
a4ac8c98 1893 goto out;
03c05665 1894
074350e2 1895 err = mpls_route_del(cfg, extack);
a4ac8c98
DA		 1896out:
1897 kfree(cfg);
1898
1899 return err;
03c05665
EB		 1900}
1901
1902
c21ef3e3
DA		 1903static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1904 struct netlink_ext_ack *extack)
03c05665 1905{
a4ac8c98 1906 struct mpls_route_config *cfg;
03c05665
EB		 1907 int err;
1908
a4ac8c98
DA		 1909 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
1910 if (!cfg)
1911 return -ENOMEM;
1912
074350e2 1913 err = rtm_to_route_config(skb, nlh, cfg, extack);
03c05665 1914 if (err < 0)
a4ac8c98 1915 goto out;
03c05665 1916
074350e2 1917 err = mpls_route_add(cfg, extack);
a4ac8c98
DA		 1918out:
1919 kfree(cfg);
1920
1921 return err;
03c05665
EB		 1922}
1923
1924static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
1925 u32 label, struct mpls_route *rt, int flags)
1926{
19d0c341 1927 struct net_device *dev;
03c05665
EB		 1928 struct nlmsghdr *nlh;
1929 struct rtmsg *rtm;
1930
1931 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
1932 if (nlh == NULL)
1933 return -EMSGSIZE;
1934
1935 rtm = nlmsg_data(nlh);
1936 rtm->rtm_family = AF_MPLS;
1937 rtm->rtm_dst_len = 20;
1938 rtm->rtm_src_len = 0;
1939 rtm->rtm_tos = 0;
1940 rtm->rtm_table = RT_TABLE_MAIN;
1941 rtm->rtm_protocol = rt->rt_protocol;
1942 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1943 rtm->rtm_type = RTN_UNICAST;
1944 rtm->rtm_flags = 0;
1945
03c05665
EB		 1946 if (nla_put_labels(skb, RTA_DST, 1, &label))
1947 goto nla_put_failure;
5b441ac8
RS		 1948
1949 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
1950 bool ttl_propagate =
1951 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
1952
1953 if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
1954 ttl_propagate))
1955 goto nla_put_failure;
1956 }
f8efb73c 1957 if (rt->rt_nhn == 1) {
cf4b24f0 1958 const struct mpls_nh *nh = rt->rt_nh;
f8efb73c
RP		 1959
1960 if (nh->nh_labels &&
1961 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
1962 nh->nh_label))
1963 goto nla_put_failure;
eb7809f0 1964 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
72dcac96 1965 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
f8efb73c
RP		 1966 nh->nh_via_alen))
1967 goto nla_put_failure;
1968 dev = rtnl_dereference(nh->nh_dev);
1969 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
1970 goto nla_put_failure;
c89359a4
RP		 1971 if (nh->nh_flags & RTNH_F_LINKDOWN)
1972 rtm->rtm_flags |= RTNH_F_LINKDOWN;
1973 if (nh->nh_flags & RTNH_F_DEAD)
1974 rtm->rtm_flags |= RTNH_F_DEAD;
f8efb73c
RP		 1975 } else {
1976 struct rtnexthop *rtnh;
1977 struct nlattr *mp;
77ef013a
DA		 1978 u8 linkdown = 0;
1979 u8 dead = 0;
f8efb73c
RP		 1980
1981 mp = nla_nest_start(skb, RTA_MULTIPATH);
1982 if (!mp)
1983 goto nla_put_failure;
1984
1985 for_nexthops(rt) {
c00e51dd
DA		 1986 dev = rtnl_dereference(nh->nh_dev);
1987 if (!dev)
1988 continue;
1989
f8efb73c
RP		 1990 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
1991 if (!rtnh)
1992 goto nla_put_failure;
1993
c00e51dd 1994 rtnh->rtnh_ifindex = dev->ifindex;
c89359a4
RP		 1995 if (nh->nh_flags & RTNH_F_LINKDOWN) {
1996 rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
1997 linkdown++;
1998 }
1999 if (nh->nh_flags & RTNH_F_DEAD) {
2000 rtnh->rtnh_flags |= RTNH_F_DEAD;
2001 dead++;
2002 }
2003
f8efb73c
RP		 2004 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
2005 nh->nh_labels,
2006 nh->nh_label))
2007 goto nla_put_failure;
f20367df
RS		 2008 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2009 nla_put_via(skb, nh->nh_via_table,
cf4b24f0 2010 mpls_nh_via(rt, nh),
f8efb73c
RP		 2011 nh->nh_via_alen))
2012 goto nla_put_failure;
2013
2014 /* length of rtnetlink header + attributes */
2015 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
2016 } endfor_nexthops(rt);
2017
c89359a4
RP		 2018 if (linkdown == rt->rt_nhn)
2019 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2020 if (dead == rt->rt_nhn)
2021 rtm->rtm_flags |= RTNH_F_DEAD;
2022
f8efb73c
RP		 2023 nla_nest_end(skb, mp);
2024 }
03c05665
EB		 2025
2026 nlmsg_end(skb, nlh);
2027 return 0;
2028
2029nla_put_failure:
2030 nlmsg_cancel(skb, nlh);
2031 return -EMSGSIZE;
2032}
2033
d8a66aa2 2034#if IS_ENABLED(CONFIG_INET)
4724676d
DA		 2035static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2036 struct fib_dump_filter *filter,
effe6792 2037 struct netlink_callback *cb)
d8a66aa2 2038{
effe6792 2039 return ip_valid_fib_dump_req(net, nlh, filter, cb);
d8a66aa2
DA		 2040}
2041#else
4724676d
DA		 2042static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
2043 struct fib_dump_filter *filter,
effe6792 2044 struct netlink_callback *cb)
d8a66aa2 2045{
effe6792 2046 struct netlink_ext_ack *extack = cb->extack;
196cfebf 2047 struct nlattr *tb[RTA_MAX + 1];
d8a66aa2 2048 struct rtmsg *rtm;
196cfebf 2049 int err, i;
d8a66aa2
DA		 2050
2051 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2052 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
2053 return -EINVAL;
2054 }
2055
2056 rtm = nlmsg_data(nlh);
2057 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
196cfebf
DA		 2058 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
2059 rtm->rtm_flags) {
d8a66aa2
DA		 2060 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
2061 return -EINVAL;
2062 }
2063
196cfebf
DA		 2064 if (rtm->rtm_protocol) {
2065 filter->protocol = rtm->rtm_protocol;
2066 filter->filter_set = 1;
2067 cb->answer_flags = NLM_F_DUMP_FILTERED;
2068 }
2069
2070 err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2071 rtm_mpls_policy, extack);
2072 if (err < 0)
2073 return err;
2074
2075 for (i = 0; i <= RTA_MAX; ++i) {
2076 int ifindex;
2077
2078 if (i == RTA_OIF) {
2079 ifindex = nla_get_u32(tb[i]);
2080 filter->dev = __dev_get_by_index(net, ifindex);
2081 if (!filter->dev)
2082 return -ENODEV;
2083 filter->filter_set = 1;
2084 } else if (tb[i]) {
2085 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
2086 return -EINVAL;
2087 }
d8a66aa2
DA		 2088 }
2089
2090 return 0;
2091}
2092#endif
2093
bae9a78b
DA		 2094static bool mpls_rt_uses_dev(struct mpls_route *rt,
2095 const struct net_device *dev)
2096{
2097 struct net_device *nh_dev;
2098
2099 if (rt->rt_nhn == 1) {
2100 struct mpls_nh *nh = rt->rt_nh;
2101
2102 nh_dev = rtnl_dereference(nh->nh_dev);
2103 if (dev == nh_dev)
2104 return true;
2105 } else {
2106 for_nexthops(rt) {
2107 nh_dev = rtnl_dereference(nh->nh_dev);
2108 if (nh_dev == dev)
2109 return true;
2110 } endfor_nexthops(rt);
2111 }
2112
2113 return false;
2114}
2115
03c05665
EB		 2116static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
2117{
e8ba330a 2118 const struct nlmsghdr *nlh = cb->nlh;
03c05665 2119 struct net *net = sock_net(skb->sk);
19d0c341 2120 struct mpls_route __rcu **platform_label;
4724676d 2121 struct fib_dump_filter filter = {};
bae9a78b 2122 unsigned int flags = NLM_F_MULTI;
19d0c341 2123 size_t platform_labels;
03c05665
EB		 2124 unsigned int index;
2125
2126 ASSERT_RTNL();
2127
e8ba330a 2128 if (cb->strict_check) {
4724676d 2129 int err;
e8ba330a 2130
effe6792 2131 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
e8ba330a
DA		 2132 if (err < 0)
2133 return err;
bae9a78b
DA		 2134
2135 /* for MPLS, there is only 1 table with fixed type and flags.
2136 * If either are set in the filter then return nothing.
2137 */
2138 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
2139 (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
2140 filter.flags)
2141 return skb->len;
e8ba330a
DA		 2142 }
2143
03c05665 2144 index = cb->args[0];
a6affd24
RS		 2145 if (index < MPLS_LABEL_FIRST_UNRESERVED)
2146 index = MPLS_LABEL_FIRST_UNRESERVED;
03c05665 2147
19d0c341
EB		 2148 platform_label = rtnl_dereference(net->mpls.platform_label);
2149 platform_labels = net->mpls.platform_labels;
bae9a78b
DA		 2150
2151 if (filter.filter_set)
2152 flags |= NLM_F_DUMP_FILTERED;
2153
19d0c341 2154 for (; index < platform_labels; index++) {
03c05665 2155 struct mpls_route *rt;
bae9a78b 2156
19d0c341 2157 rt = rtnl_dereference(platform_label[index]);
03c05665
EB		 2158 if (!rt)
2159 continue;
2160
bae9a78b
DA		 2161 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
2162 (filter.protocol && rt->rt_protocol != filter.protocol))
2163 continue;
2164
03c05665
EB		 2165 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
2166 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
bae9a78b 2167 index, rt, flags) < 0)
03c05665
EB		 2168 break;
2169 }
2170 cb->args[0] = index;
2171
2172 return skb->len;
2173}
2174
8de147dc
EB		 2175static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
2176{
2177 size_t payload =
2178 NLMSG_ALIGN(sizeof(struct rtmsg))
5b441ac8
RS		 2179 + nla_total_size(4) /* RTA_DST */
2180 + nla_total_size(1); /* RTA_TTL_PROPAGATE */
f8efb73c
RP		 2181
2182 if (rt->rt_nhn == 1) {
2183 struct mpls_nh *nh = rt->rt_nh;
2184
2185 if (nh->nh_dev)
2186 payload += nla_total_size(4); /* RTA_OIF */
eb7809f0 2187 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
72dcac96 2188 payload += nla_total_size(2 + nh->nh_via_alen);
f8efb73c
RP		 2189 if (nh->nh_labels) /* RTA_NEWDST */
2190 payload += nla_total_size(nh->nh_labels * 4);
2191 } else {
2192 /* each nexthop is packed in an attribute */
2193 size_t nhsize = 0;
2194
2195 for_nexthops(rt) {
e944e97a
DA		 2196 if (!rtnl_dereference(nh->nh_dev))
2197 continue;
f8efb73c 2198 nhsize += nla_total_size(sizeof(struct rtnexthop));
f20367df
RS		 2199 /* RTA_VIA */
2200 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
2201 nhsize += nla_total_size(2 + nh->nh_via_alen);
f8efb73c
RP		 2202 if (nh->nh_labels)
2203 nhsize += nla_total_size(nh->nh_labels * 4);
2204 } endfor_nexthops(rt);
2205 /* nested attribute */
2206 payload += nla_total_size(nhsize);
2207 }
2208
8de147dc
EB		 2209 return payload;
2210}
2211
2212static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
2213 struct nlmsghdr *nlh, struct net *net, u32 portid,
2214 unsigned int nlm_flags)
2215{
2216 struct sk_buff *skb;
2217 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2218 int err = -ENOBUFS;
2219
2220 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2221 if (skb == NULL)
2222 goto errout;
2223
2224 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
2225 if (err < 0) {
2226 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2227 WARN_ON(err == -EMSGSIZE);
2228 kfree_skb(skb);
2229 goto errout;
2230 }
2231 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
2232
2233 return;
2234errout:
2235 if (err < 0)
2236 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
2237}
2238
397fc9e5
RP		 2239static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
2240 struct netlink_ext_ack *extack)
2241{
2242 struct net *net = sock_net(in_skb->sk);
2243 u32 portid = NETLINK_CB(in_skb).portid;
a906c1aa 2244 u32 in_label = LABEL_NOT_SPECIFIED;
397fc9e5
RP		 2245 struct nlattr *tb[RTA_MAX + 1];
2246 u32 labels[MAX_NEW_LABELS];
2247 struct mpls_shim_hdr *hdr;
2248 unsigned int hdr_size = 0;
2249 struct net_device *dev;
2250 struct mpls_route *rt;
2251 struct rtmsg *rtm, *r;
2252 struct nlmsghdr *nlh;
2253 struct sk_buff *skb;
2254 struct mpls_nh *nh;
397fc9e5 2255 u8 n_labels;
a906c1aa 2256 int err;
397fc9e5
RP		 2257
2258 err = nlmsg_parse(in_nlh, sizeof(*rtm), tb, RTA_MAX,
ca4a1cd9 2259 rtm_mpls_policy, extack);
397fc9e5
RP		 2260 if (err < 0)
2261 goto errout;
2262
2263 rtm = nlmsg_data(in_nlh);
2264
2265 if (tb[RTA_DST]) {
2266 u8 label_count;
2267
2268 if (nla_get_labels(tb[RTA_DST], 1, &label_count,
a906c1aa
RP		 2269 &in_label, extack)) {
2270 err = -EINVAL;
397fc9e5 2271 goto errout;
a906c1aa 2272 }
397fc9e5 2273
3968523f 2274 if (!mpls_label_ok(net, &in_label, extack)) {
a906c1aa 2275 err = -EINVAL;
397fc9e5 2276 goto errout;
a906c1aa 2277 }
397fc9e5
RP		 2278 }
2279
2280 rt = mpls_route_input_rcu(net, in_label);
2281 if (!rt) {
2282 err = -ENETUNREACH;
2283 goto errout;
2284 }
2285
2286 if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
2287 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
2288 if (!skb) {
2289 err = -ENOBUFS;
2290 goto errout;
2291 }
2292
2293 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
2294 RTM_NEWROUTE, in_label, rt, 0);
2295 if (err < 0) {
2296 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
2297 WARN_ON(err == -EMSGSIZE);
2298 goto errout_free;
2299 }
2300
2301 return rtnl_unicast(skb, net, portid);
2302 }
2303
2304 if (tb[RTA_NEWDST]) {
2305 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
2306 labels, extack) != 0) {
2307 err = -EINVAL;
2308 goto errout;
2309 }
2310
2311 hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
2312 }
2313
2314 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2315 if (!skb) {
2316 err = -ENOBUFS;
2317 goto errout;
2318 }
2319
2320 skb->protocol = htons(ETH_P_MPLS_UC);
2321
2322 if (hdr_size) {
2323 bool bos;
2324 int i;
2325
2326 if (skb_cow(skb, hdr_size)) {
2327 err = -ENOBUFS;
2328 goto errout_free;
2329 }
2330
2331 skb_reserve(skb, hdr_size);
2332 skb_push(skb, hdr_size);
2333 skb_reset_network_header(skb);
2334
2335 /* Push new labels */
2336 hdr = mpls_hdr(skb);
2337 bos = true;
2338 for (i = n_labels - 1; i >= 0; i--) {
2339 hdr[i] = mpls_entry_encode(labels[i],
2340 1, 0, bos);
2341 bos = false;
2342 }
2343 }
2344
2345 nh = mpls_select_multipath(rt, skb);
2346 if (!nh) {
2347 err = -ENETUNREACH;
2348 goto errout_free;
2349 }
2350
2351 if (hdr_size) {
2352 skb_pull(skb, hdr_size);
2353 skb_reset_network_header(skb);
2354 }
2355
2356 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
2357 RTM_NEWROUTE, sizeof(*r), 0);
2358 if (!nlh) {
2359 err = -EMSGSIZE;
2360 goto errout_free;
2361 }
2362
2363 r = nlmsg_data(nlh);
2364 r->rtm_family = AF_MPLS;
2365 r->rtm_dst_len = 20;
2366 r->rtm_src_len = 0;
2367 r->rtm_table = RT_TABLE_MAIN;
2368 r->rtm_type = RTN_UNICAST;
2369 r->rtm_scope = RT_SCOPE_UNIVERSE;
2370 r->rtm_protocol = rt->rt_protocol;
2371 r->rtm_flags = 0;
2372
2373 if (nla_put_labels(skb, RTA_DST, 1, &in_label))
2374 goto nla_put_failure;
2375
2376 if (nh->nh_labels &&
2377 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
2378 nh->nh_label))
2379 goto nla_put_failure;
2380
2381 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
2382 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
2383 nh->nh_via_alen))
2384 goto nla_put_failure;
2385 dev = rtnl_dereference(nh->nh_dev);
2386 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
2387 goto nla_put_failure;
2388
2389 nlmsg_end(skb, nlh);
2390
2391 err = rtnl_unicast(skb, net, portid);
2392errout:
2393 return err;
2394
2395nla_put_failure:
2396 nlmsg_cancel(skb, nlh);
2397 err = -EMSGSIZE;
2398errout_free:
2399 kfree_skb(skb);
2400 return err;
2401}
2402
7720c01f
EB		 2403static int resize_platform_label_table(struct net *net, size_t limit)
2404{
2405 size_t size = sizeof(struct mpls_route *) * limit;
2406 size_t old_limit;
2407 size_t cp_size;
2408 struct mpls_route __rcu **labels = NULL, **old;
2409 struct mpls_route *rt0 = NULL, *rt2 = NULL;
2410 unsigned index;
2411
2412 if (size) {
752ade68 2413 labels = kvzalloc(size, GFP_KERNEL);
7720c01f
EB		 2414 if (!labels)
2415 goto nolabels;
2416 }
2417
2418 /* In case the predefined labels need to be populated */
78f5b899 2419 if (limit > MPLS_LABEL_IPV4NULL) {
7720c01f 2420 struct net_device *lo = net->loopback_dev;
a4ac8c98 2421 rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
df1c6316 2422 if (IS_ERR(rt0))
7720c01f 2423 goto nort0;
f8efb73c 2424 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
7720c01f 2425 rt0->rt_protocol = RTPROT_KERNEL;
118d5234 2426 rt0->rt_payload_type = MPT_IPV4;
5b441ac8 2427 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
f8efb73c 2428 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
b4e04fc7 2429 rt0->rt_nh->nh_via_alen = lo->addr_len;
cf4b24f0
RS		 2430 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
2431 lo->addr_len);
7720c01f 2432 }
78f5b899 2433 if (limit > MPLS_LABEL_IPV6NULL) {
7720c01f 2434 struct net_device *lo = net->loopback_dev;
a4ac8c98 2435 rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
df1c6316 2436 if (IS_ERR(rt2))
7720c01f 2437 goto nort2;
f8efb73c 2438 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
7720c01f 2439 rt2->rt_protocol = RTPROT_KERNEL;
118d5234 2440 rt2->rt_payload_type = MPT_IPV6;
6a18c312 2441 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
f8efb73c 2442 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
b4e04fc7 2443 rt2->rt_nh->nh_via_alen = lo->addr_len;
cf4b24f0
RS		 2444 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
2445 lo->addr_len);
7720c01f
EB		 2446 }
2447
2448 rtnl_lock();
2449 /* Remember the original table */
19d0c341 2450 old = rtnl_dereference(net->mpls.platform_label);
7720c01f
EB		 2451 old_limit = net->mpls.platform_labels;
2452
2453 /* Free any labels beyond the new table */
2454 for (index = limit; index < old_limit; index++)
f8efb73c 2455 mpls_route_update(net, index, NULL, NULL);
7720c01f
EB		 2456
2457 /* Copy over the old labels */
2458 cp_size = size;
2459 if (old_limit < limit)
2460 cp_size = old_limit * sizeof(struct mpls_route *);
2461
2462 memcpy(labels, old, cp_size);
2463
2464 /* If needed set the predefined labels */
78f5b899
TH		 2465 if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
2466 (limit > MPLS_LABEL_IPV6NULL)) {
2467 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
7720c01f
EB		 2468 rt2 = NULL;
2469 }
2470
78f5b899
TH		 2471 if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
2472 (limit > MPLS_LABEL_IPV4NULL)) {
2473 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
7720c01f
EB		 2474 rt0 = NULL;
2475 }
2476
2477 /* Update the global pointers */
2478 net->mpls.platform_labels = limit;
19d0c341 2479 rcu_assign_pointer(net->mpls.platform_label, labels);
7720c01f
EB		 2480
2481 rtnl_unlock();
2482
2483 mpls_rt_free(rt2);
2484 mpls_rt_free(rt0);
2485
2486 if (old) {
2487 synchronize_rcu();
2488 kvfree(old);
2489 }
2490 return 0;
2491
2492nort2:
2493 mpls_rt_free(rt0);
2494nort0:
2495 kvfree(labels);
2496nolabels:
2497 return -ENOMEM;
2498}
2499
2500static int mpls_platform_labels(struct ctl_table *table, int write,
2501 void __user *buffer, size_t *lenp, loff_t *ppos)
2502{
2503 struct net *net = table->data;
2504 int platform_labels = net->mpls.platform_labels;
2505 int ret;
2506 struct ctl_table tmp = {
2507 .procname = table->procname,
2508 .data = &platform_labels,
2509 .maxlen = sizeof(int),
2510 .mode = table->mode,
2511 .extra1 = &zero,
2512 .extra2 = &label_limit,
2513 };
2514
2515 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
2516
2517 if (write && ret == 0)
2518 ret = resize_platform_label_table(net, platform_labels);
2519
2520 return ret;
2521}
2522
5b441ac8
RS		 2523#define MPLS_NS_SYSCTL_OFFSET(field) \
2524 (&((struct net *)0)->field)
2525
37bde799 2526static const struct ctl_table mpls_table[] = {
7720c01f
EB		 2527 {
2528 .procname = "platform_labels",
2529 .data = NULL,
2530 .maxlen = sizeof(int),
2531 .mode = 0644,
2532 .proc_handler = mpls_platform_labels,
2533 },
5b441ac8
RS		 2534 {
2535 .procname = "ip_ttl_propagate",
2536 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
2537 .maxlen = sizeof(int),
2538 .mode = 0644,
2539 .proc_handler = proc_dointvec_minmax,
2540 .extra1 = &zero,
2541 .extra2 = &one,
2542 },
a59166e4
RS		 2543 {
2544 .procname = "default_ttl",
2545 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
2546 .maxlen = sizeof(int),
2547 .mode = 0644,
2548 .proc_handler = proc_dointvec_minmax,
2549 .extra1 = &one,
2550 .extra2 = &ttl_max,
2551 },
7720c01f
EB		 2552 { }
2553};
2554
0189197f
EB		 2555static int mpls_net_init(struct net *net)
2556{
7720c01f 2557 struct ctl_table *table;
5b441ac8 2558 int i;
7720c01f 2559
0189197f
EB		 2560 net->mpls.platform_labels = 0;
2561 net->mpls.platform_label = NULL;
5b441ac8 2562 net->mpls.ip_ttl_propagate = 1;
a59166e4 2563 net->mpls.default_ttl = 255;
0189197f 2564
7720c01f
EB		 2565 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
2566 if (table == NULL)
2567 return -ENOMEM;
2568
5b441ac8
RS		 2569 /* Table data contains only offsets relative to the base of
2570 * the mdev at this point, so make them absolute.
2571 */
2572 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
2573 table[i].data = (char *)net + (uintptr_t)table[i].data;
2574
7720c01f 2575 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
6ea3c9d5
NA		 2576 if (net->mpls.ctl == NULL) {
2577 kfree(table);
7720c01f 2578 return -ENOMEM;
6ea3c9d5 2579 }
7720c01f 2580
0189197f
EB		 2581 return 0;
2582}
2583
2584static void mpls_net_exit(struct net *net)
2585{
19d0c341
EB		 2586 struct mpls_route __rcu **platform_label;
2587 size_t platform_labels;
7720c01f 2588 struct ctl_table *table;
0189197f
EB		 2589 unsigned int index;
2590
7720c01f
EB		 2591 table = net->mpls.ctl->ctl_table_arg;
2592 unregister_net_sysctl_table(net->mpls.ctl);
2593 kfree(table);
2594
19d0c341
EB		 2595 /* An rcu grace period has passed since there was a device in
2596 * the network namespace (and thus the last in flight packet)
0189197f
EB		 2597 * left this network namespace. This is because
2598 * unregister_netdevice_many and netdev_run_todo has completed
2599 * for each network device that was in this network namespace.
2600 *
2601 * As such no additional rcu synchronization is necessary when
2602 * freeing the platform_label table.
2603 */
2604 rtnl_lock();
19d0c341
EB		 2605 platform_label = rtnl_dereference(net->mpls.platform_label);
2606 platform_labels = net->mpls.platform_labels;
2607 for (index = 0; index < platform_labels; index++) {
2608 struct mpls_route *rt = rtnl_dereference(platform_label[index]);
2609 RCU_INIT_POINTER(platform_label[index], NULL);
e37791ec 2610 mpls_notify_route(net, index, rt, NULL, NULL);
0189197f
EB		 2611 mpls_rt_free(rt);
2612 }
2613 rtnl_unlock();
2614
19d0c341 2615 kvfree(platform_label);
0189197f
EB		 2616}
2617
2618static struct pernet_operations mpls_net_ops = {
2619 .init = mpls_net_init,
2620 .exit = mpls_net_exit,
2621};
2622
27d69105
RS		 2623static struct rtnl_af_ops mpls_af_ops __read_mostly = {
2624 .family = AF_MPLS,
2625 .fill_stats_af = mpls_fill_stats_af,
2626 .get_stats_af_size = mpls_get_stats_af_size,
2627};
2628
0189197f
EB		 2629static int __init mpls_init(void)
2630{
2631 int err;
2632
2633 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
2634
2635 err = register_pernet_subsys(&mpls_net_ops);
2636 if (err)
2637 goto out;
2638
2639 err = register_netdevice_notifier(&mpls_dev_notifier);
2640 if (err)
2641 goto out_unregister_pernet;
2642
2643 dev_add_pack(&mpls_packet_type);
2644
27d69105
RS		 2645 rtnl_af_register(&mpls_af_ops);
2646
c1c502b5
FW		 2647 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
2648 mpls_rtm_newroute, NULL, 0);
2649 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
2650 mpls_rtm_delroute, NULL, 0);
2651 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
2652 mpls_getroute, mpls_dump_routes, 0);
2653 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
2654 mpls_netconf_get_devconf,
2655 mpls_netconf_dump_devconf, 0);
bdc47641
AK		 2656 err = ipgre_tunnel_encap_add_mpls_ops();
2657 if (err)
2658 pr_err("Can't add mpls over gre tunnel ops\n");
2659
0189197f
EB		 2660 err = 0;
2661out:
2662 return err;
2663
2664out_unregister_pernet:
2665 unregister_pernet_subsys(&mpls_net_ops);
2666 goto out;
2667}
2668module_init(mpls_init);
2669
2670static void __exit mpls_exit(void)
2671{
03c05665 2672 rtnl_unregister_all(PF_MPLS);
27d69105 2673 rtnl_af_unregister(&mpls_af_ops);
0189197f
EB		 2674 dev_remove_pack(&mpls_packet_type);
2675 unregister_netdevice_notifier(&mpls_dev_notifier);
2676 unregister_pernet_subsys(&mpls_net_ops);
bdc47641 2677 ipgre_tunnel_encap_del_mpls_ops();
0189197f
EB		 2678}
2679module_exit(mpls_exit);
2680
2681MODULE_DESCRIPTION("MultiProtocol Label Switching");
2682MODULE_LICENSE("GPL v2");
2683MODULE_ALIAS_NETPROTO(PF_MPLS);
Linux 6.x block layer and io_uring tree(s)