Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0189197f EB |
2 | #include <linux/types.h> |
3 | #include <linux/skbuff.h> | |
4 | #include <linux/socket.h> | |
7720c01f | 5 | #include <linux/sysctl.h> |
0189197f EB |
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> | |
24045a03 | 11 | #include <linux/netconf.h> |
3968523f | 12 | #include <linux/nospec.h> |
4b5edb2f | 13 | #include <linux/vmalloc.h> |
27d69105 | 14 | #include <linux/percpu.h> |
d457a0e3 | 15 | #include <net/gso.h> |
0189197f EB |
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> | |
bdc47641 | 22 | #include <net/ip_tunnels.h> |
0189197f | 23 | #include <net/netns/generic.h> |
bf21563a RP |
24 | #if IS_ENABLED(CONFIG_IPV6) |
25 | #include <net/ipv6.h> | |
bf21563a | 26 | #endif |
3616d08b | 27 | #include <net/ipv6_stubs.h> |
3c618c1d | 28 | #include <net/rtnh.h> |
0189197f EB |
29 | #include "internal.h" |
30 | ||
df1c6316 DA |
31 | /* max memory we will use for mpls_route */ |
32 | #define MAX_MPLS_ROUTE_MEM 4096 | |
33 | ||
1c78efa8 RS |
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 | ||
eb7809f0 RS |
39 | #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) |
40 | ||
7720c01f | 41 | static int label_limit = (1 << 20) - 1; |
a59166e4 | 42 | static int ttl_max = 255; |
7720c01f | 43 | |
bdc47641 | 44 | #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) |
14c68c43 | 45 | static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) |
bdc47641 AK |
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 | ||
8de147dc EB |
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 | ||
0189197f EB |
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 | ||
face0188 | 90 | bool mpls_output_possible(const struct net_device *dev) |
0189197f EB |
91 | { |
92 | return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); | |
93 | } | |
face0188 | 94 | EXPORT_SYMBOL_GPL(mpls_output_possible); |
0189197f | 95 | |
cf4b24f0 RS |
96 | static 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 | ||
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 | ||
f8efb73c | 107 | static 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 | 113 | unsigned 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 | 118 | EXPORT_SYMBOL_GPL(mpls_dev_mtu); |
0189197f | 119 | |
face0188 | 120 | bool 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 | 130 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
0189197f | 131 | |
27d69105 RS |
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 | ||
9f427a0e | 157 | static 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 |
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 | ||
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 | */ | |
f05b0b97 BP |
234 | static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, |
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 | 266 | out: |
59b20966 | 267 | return mpls_get_nexthop(rt, nh_index); |
f8efb73c RP |
268 | } |
269 | ||
5b441ac8 RS |
270 | static 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 | ||
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; | |
f05b0b97 | 347 | const struct mpls_nh *nh; |
0189197f EB |
348 | struct mpls_route *rt; |
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 | 380 | |
0992d67b GN |
381 | skb_dst_drop(skb); |
382 | ||
0189197f EB |
383 | /* Read and decode the label */ |
384 | hdr = mpls_hdr(skb); | |
385 | dec = mpls_entry_decode(hdr); | |
386 | ||
0189197f | 387 | rt = mpls_route_input_rcu(net, dec.label); |
27d69105 RS |
388 | if (!rt) { |
389 | MPLS_INC_STATS(mdev, rx_noroute); | |
0189197f | 390 | goto drop; |
27d69105 | 391 | } |
0189197f | 392 | |
9f427a0e | 393 | nh = mpls_select_multipath(rt, skb); |
f8efb73c | 394 | if (!nh) |
27d69105 | 395 | goto err; |
0189197f | 396 | |
9f427a0e DA |
397 | /* Pop the label */ |
398 | skb_pull(skb, sizeof(*hdr)); | |
399 | skb_reset_network_header(skb); | |
400 | ||
401 | skb_orphan(skb); | |
402 | ||
0189197f | 403 | if (skb_warn_if_lro(skb)) |
27d69105 | 404 | goto err; |
0189197f EB |
405 | |
406 | skb_forward_csum(skb); | |
407 | ||
408 | /* Verify ttl is valid */ | |
aa7da937 | 409 | if (dec.ttl <= 1) |
27d69105 | 410 | goto err; |
0189197f | 411 | |
27d69105 | 412 | /* Find the output device */ |
18916818 | 413 | out_dev = nh->nh_dev; |
27d69105 RS |
414 | if (!mpls_output_possible(out_dev)) |
415 | goto tx_err; | |
416 | ||
0189197f | 417 | /* Verify the destination can hold the packet */ |
f8efb73c | 418 | new_header_size = mpls_nh_header_size(nh); |
0189197f EB |
419 | mtu = mpls_dev_mtu(out_dev); |
420 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) | |
27d69105 | 421 | goto tx_err; |
0189197f EB |
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)) | |
27d69105 | 429 | goto tx_err; |
0189197f EB |
430 | |
431 | skb->dev = out_dev; | |
432 | skb->protocol = htons(ETH_P_MPLS_UC); | |
433 | ||
6a6b83ca | 434 | dec.ttl -= 1; |
0189197f EB |
435 | if (unlikely(!new_header_size && dec.bos)) { |
436 | /* Penultimate hop popping */ | |
5b441ac8 | 437 | if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) |
27d69105 | 438 | goto err; |
0189197f EB |
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; | |
f8efb73c RP |
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); | |
0189197f EB |
450 | bos = false; |
451 | } | |
452 | } | |
453 | ||
27d69105 RS |
454 | mpls_stats_inc_outucastpkts(out_dev, skb); |
455 | ||
eb7809f0 RS |
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); | |
0189197f EB |
463 | if (err) |
464 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", | |
465 | __func__, err); | |
466 | return 0; | |
467 | ||
27d69105 RS |
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); | |
0189197f EB |
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 | ||
f0126539 | 485 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
03c05665 EB |
486 | [RTA_DST] = { .type = NLA_U32 }, |
487 | [RTA_OIF] = { .type = NLA_U32 }, | |
5b441ac8 | 488 | [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, |
03c05665 EB |
489 | }; |
490 | ||
a2519929 | 491 | struct mpls_route_config { |
118d5234 RS |
492 | u32 rc_protocol; |
493 | u32 rc_ifindex; | |
f8efb73c RP |
494 | u8 rc_via_table; |
495 | u8 rc_via_alen; | |
118d5234 RS |
496 | u8 rc_via[MAX_VIA_ALEN]; |
497 | u32 rc_label; | |
5b441ac8 | 498 | u8 rc_ttl_propagate; |
f8efb73c | 499 | u8 rc_output_labels; |
118d5234 RS |
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; | |
f8efb73c RP |
504 | struct rtnexthop *rc_mp; |
505 | int rc_mp_len; | |
a2519929 EB |
506 | }; |
507 | ||
59b20966 DA |
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) | |
0189197f | 512 | { |
59b20966 | 513 | u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); |
0189197f | 514 | struct mpls_route *rt; |
df1c6316 | 515 | size_t size; |
0189197f | 516 | |
df1c6316 DA |
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); | |
f8efb73c | 529 | |
0189197f EB |
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 | ||
8de147dc EB |
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 */ | |
a6affd24 | 549 | if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) |
8de147dc EB |
550 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); |
551 | } | |
552 | ||
0189197f | 553 | static void mpls_route_update(struct net *net, unsigned index, |
f8efb73c | 554 | struct mpls_route *new, |
0189197f EB |
555 | const struct nl_info *info) |
556 | { | |
19d0c341 | 557 | struct mpls_route __rcu **platform_label; |
f8efb73c | 558 | struct mpls_route *rt; |
0189197f EB |
559 | |
560 | ASSERT_RTNL(); | |
561 | ||
19d0c341 EB |
562 | platform_label = rtnl_dereference(net->mpls.platform_label); |
563 | rt = rtnl_dereference(platform_label[index]); | |
f8efb73c | 564 | rcu_assign_pointer(platform_label[index], new); |
0189197f | 565 | |
f8efb73c | 566 | mpls_notify_route(net, index, rt, new, info); |
8de147dc | 567 | |
0189197f | 568 | /* If we removed a route free it now */ |
f8efb73c | 569 | mpls_rt_free(rt); |
0189197f EB |
570 | } |
571 | ||
a2519929 EB |
572 | static unsigned find_free_label(struct net *net) |
573 | { | |
19d0c341 EB |
574 | struct mpls_route __rcu **platform_label; |
575 | size_t platform_labels; | |
a2519929 | 576 | unsigned index; |
19d0c341 EB |
577 | |
578 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
579 | platform_labels = net->mpls.platform_labels; | |
a6affd24 RS |
580 | for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; |
581 | index++) { | |
19d0c341 | 582 | if (!rtnl_dereference(platform_label[index])) |
a2519929 EB |
583 | return index; |
584 | } | |
585 | return LABEL_NOT_SPECIFIED; | |
586 | } | |
587 | ||
bf21563a | 588 | #if IS_ENABLED(CONFIG_INET) |
cf4b24f0 RS |
589 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
590 | const void *addr) | |
01faef2c | 591 | { |
5a9348b5 | 592 | struct net_device *dev; |
01faef2c RP |
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); | |
598 | if (IS_ERR(rt)) | |
5a9348b5 | 599 | return ERR_CAST(rt); |
01faef2c RP |
600 | |
601 | dev = rt->dst.dev; | |
602 | dev_hold(dev); | |
603 | ||
604 | ip_rt_put(rt); | |
605 | ||
01faef2c | 606 | return dev; |
bf21563a RP |
607 | } |
608 | #else | |
cf4b24f0 RS |
609 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
610 | const void *addr) | |
bf21563a RP |
611 | { |
612 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c | 613 | } |
bf21563a | 614 | #endif |
01faef2c | 615 | |
bf21563a | 616 | #if IS_ENABLED(CONFIG_IPV6) |
cf4b24f0 RS |
617 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
618 | const void *addr) | |
01faef2c | 619 | { |
5a9348b5 | 620 | struct net_device *dev; |
01faef2c RP |
621 | struct dst_entry *dst; |
622 | struct flowi6 fl6; | |
bf21563a RP |
623 | |
624 | if (!ipv6_stub) | |
625 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c RP |
626 | |
627 | memset(&fl6, 0, sizeof(fl6)); | |
628 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); | |
6c8991f4 SD |
629 | dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); |
630 | if (IS_ERR(dst)) | |
631 | return ERR_CAST(dst); | |
01faef2c RP |
632 | |
633 | dev = dst->dev; | |
634 | dev_hold(dev); | |
01faef2c RP |
635 | dst_release(dst); |
636 | ||
637 | return dev; | |
638 | } | |
bf21563a | 639 | #else |
cf4b24f0 RS |
640 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
641 | const void *addr) | |
bf21563a RP |
642 | { |
643 | return ERR_PTR(-EAFNOSUPPORT); | |
644 | } | |
645 | #endif | |
01faef2c RP |
646 | |
647 | static struct net_device *find_outdev(struct net *net, | |
cf4b24f0 | 648 | struct mpls_route *rt, |
f8efb73c | 649 | struct mpls_nh *nh, int oif) |
01faef2c RP |
650 | { |
651 | struct net_device *dev = NULL; | |
652 | ||
f8efb73c RP |
653 | if (!oif) { |
654 | switch (nh->nh_via_table) { | |
01faef2c | 655 | case NEIGH_ARP_TABLE: |
cf4b24f0 | 656 | dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
657 | break; |
658 | case NEIGH_ND_TABLE: | |
cf4b24f0 | 659 | dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
660 | break; |
661 | case NEIGH_LINK_TABLE: | |
662 | break; | |
663 | } | |
664 | } else { | |
f8efb73c | 665 | dev = dev_get_by_index(net, oif); |
01faef2c RP |
666 | } |
667 | ||
3dcb615e RP |
668 | if (!dev) |
669 | return ERR_PTR(-ENODEV); | |
670 | ||
94a57f1f RP |
671 | if (IS_ERR(dev)) |
672 | return dev; | |
673 | ||
f8efb73c RP |
674 | /* The caller is holding rtnl anyways, so release the dev reference */ |
675 | dev_put(dev); | |
676 | ||
01faef2c RP |
677 | return dev; |
678 | } | |
679 | ||
cf4b24f0 RS |
680 | static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, |
681 | struct mpls_nh *nh, int oif) | |
f8efb73c RP |
682 | { |
683 | struct net_device *dev = NULL; | |
684 | int err = -ENODEV; | |
685 | ||
cf4b24f0 | 686 | dev = find_outdev(net, rt, nh, oif); |
f8efb73c RP |
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 | ||
a3e948e8 RS |
698 | if ((nh->nh_via_table == NEIGH_LINK_TABLE) && |
699 | (dev->addr_len != nh->nh_via_alen)) | |
700 | goto errout; | |
701 | ||
18916818 | 702 | nh->nh_dev = dev; |
f8efb73c | 703 | |
c89359a4 RP |
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 | ||
f8efb73c RP |
714 | return 0; |
715 | ||
716 | errout: | |
717 | return err; | |
718 | } | |
719 | ||
d4e72560 DA |
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 | ||
f8efb73c RP |
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 | ||
f8efb73c RP |
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; | |
cf4b24f0 | 784 | memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); |
f8efb73c RP |
785 | nh->nh_via_alen = cfg->rc_via_alen; |
786 | ||
cf4b24f0 | 787 | err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); |
f8efb73c RP |
788 | if (err) |
789 | goto errout; | |
790 | ||
c89359a4 RP |
791 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
792 | rt->rt_nhn_alive--; | |
793 | ||
f8efb73c RP |
794 | return 0; |
795 | ||
796 | errout: | |
797 | return err; | |
798 | } | |
799 | ||
cf4b24f0 | 800 | static int mpls_nh_build(struct net *net, struct mpls_route *rt, |
c89359a4 | 801 | struct mpls_nh *nh, int oif, struct nlattr *via, |
074350e2 DA |
802 | struct nlattr *newdst, u8 max_labels, |
803 | struct netlink_ext_ack *extack) | |
f8efb73c RP |
804 | { |
805 | int err = -ENOMEM; | |
806 | ||
807 | if (!nh) | |
808 | goto errout; | |
809 | ||
810 | if (newdst) { | |
a1f10abe | 811 | err = nla_get_labels(newdst, max_labels, &nh->nh_labels, |
074350e2 | 812 | nh->nh_label, extack); |
f8efb73c RP |
813 | if (err) |
814 | goto errout; | |
815 | } | |
816 | ||
f20367df RS |
817 | if (via) { |
818 | err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, | |
074350e2 | 819 | __mpls_nh_via(rt, nh), extack); |
f20367df RS |
820 | if (err) |
821 | goto errout; | |
822 | } else { | |
823 | nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; | |
824 | } | |
f8efb73c | 825 | |
cf4b24f0 | 826 | err = mpls_nh_assign_dev(net, rt, nh, oif); |
f8efb73c RP |
827 | if (err) |
828 | goto errout; | |
829 | ||
830 | return 0; | |
831 | ||
832 | errout: | |
833 | return err; | |
834 | } | |
835 | ||
77ef013a | 836 | static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, |
a4ac8c98 DA |
837 | u8 cfg_via_alen, u8 *max_via_alen, |
838 | u8 *max_labels) | |
f8efb73c | 839 | { |
f8efb73c | 840 | int remaining = len; |
77ef013a | 841 | u8 nhs = 0; |
f8efb73c | 842 | |
cf4b24f0 | 843 | *max_via_alen = 0; |
a4ac8c98 | 844 | *max_labels = 0; |
cf4b24f0 | 845 | |
f8efb73c | 846 | while (rtnh_ok(rtnh, remaining)) { |
cf4b24f0 RS |
847 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
848 | int attrlen; | |
a4ac8c98 | 849 | u8 n_labels = 0; |
cf4b24f0 RS |
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 | ||
a4ac8c98 DA |
863 | nla = nla_find(attrs, attrlen, RTA_NEWDST); |
864 | if (nla && | |
a1f10abe DA |
865 | nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, |
866 | NULL, NULL) != 0) | |
a4ac8c98 DA |
867 | return 0; |
868 | ||
869 | *max_labels = max_t(u8, *max_labels, n_labels); | |
870 | ||
77ef013a DA |
871 | /* number of nexthops is tracked by a u8. |
872 | * Check for overflow. | |
873 | */ | |
874 | if (nhs == 255) | |
875 | return 0; | |
f8efb73c | 876 | nhs++; |
77ef013a | 877 | |
f8efb73c RP |
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, | |
074350e2 DA |
886 | struct mpls_route *rt, u8 max_labels, |
887 | struct netlink_ext_ack *extack) | |
f8efb73c RP |
888 | { |
889 | struct rtnexthop *rtnh = cfg->rc_mp; | |
890 | struct nlattr *nla_via, *nla_newdst; | |
891 | int remaining = cfg->rc_mp_len; | |
f8efb73c | 892 | int err = 0; |
77ef013a | 893 | u8 nhs = 0; |
f8efb73c RP |
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 | ||
1c78efa8 RS |
905 | /* neither weighted multipath nor any flags |
906 | * are supported | |
907 | */ | |
908 | if (rtnh->rtnh_hops || rtnh->rtnh_flags) | |
909 | goto errout; | |
910 | ||
f8efb73c RP |
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 | ||
cf4b24f0 | 919 | err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, |
a4ac8c98 | 920 | rtnh->rtnh_ifindex, nla_via, nla_newdst, |
074350e2 | 921 | max_labels, extack); |
f8efb73c RP |
922 | if (err) |
923 | goto errout; | |
924 | ||
c89359a4 RP |
925 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
926 | rt->rt_nhn_alive--; | |
927 | ||
f8efb73c RP |
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 | ||
3968523f | 940 | static bool mpls_label_ok(struct net *net, unsigned int *index, |
074350e2 | 941 | struct netlink_ext_ack *extack) |
b7b386f4 | 942 | { |
3968523f DW |
943 | bool is_ok = true; |
944 | ||
b7b386f4 | 945 | /* Reserved labels may not be set */ |
3968523f | 946 | if (*index < MPLS_LABEL_FIRST_UNRESERVED) { |
074350e2 DA |
947 | NL_SET_ERR_MSG(extack, |
948 | "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); | |
3968523f | 949 | is_ok = false; |
074350e2 | 950 | } |
b7b386f4 DA |
951 | |
952 | /* The full 20 bit range may not be supported. */ | |
3968523f | 953 | if (is_ok && *index >= net->mpls.platform_labels) { |
074350e2 DA |
954 | NL_SET_ERR_MSG(extack, |
955 | "Label >= configured maximum in platform_labels"); | |
3968523f | 956 | is_ok = false; |
074350e2 | 957 | } |
b7b386f4 | 958 | |
3968523f DW |
959 | *index = array_index_nospec(*index, net->mpls.platform_labels); |
960 | return is_ok; | |
b7b386f4 DA |
961 | } |
962 | ||
074350e2 DA |
963 | static int mpls_route_add(struct mpls_route_config *cfg, |
964 | struct netlink_ext_ack *extack) | |
a2519929 | 965 | { |
19d0c341 | 966 | struct mpls_route __rcu **platform_label; |
a2519929 | 967 | struct net *net = cfg->rc_nlinfo.nl_net; |
a2519929 | 968 | struct mpls_route *rt, *old; |
a2519929 | 969 | int err = -EINVAL; |
cf4b24f0 | 970 | u8 max_via_alen; |
f8efb73c | 971 | unsigned index; |
a4ac8c98 | 972 | u8 max_labels; |
77ef013a | 973 | u8 nhs; |
a2519929 EB |
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 | ||
3968523f | 983 | if (!mpls_label_ok(net, &index, extack)) |
a2519929 EB |
984 | goto errout; |
985 | ||
a2519929 | 986 | /* Append makes no sense with mpls */ |
0f7bbd58 | 987 | err = -EOPNOTSUPP; |
074350e2 DA |
988 | if (cfg->rc_nlflags & NLM_F_APPEND) { |
989 | NL_SET_ERR_MSG(extack, "MPLS does not support route append"); | |
a2519929 | 990 | goto errout; |
074350e2 | 991 | } |
a2519929 EB |
992 | |
993 | err = -EEXIST; | |
19d0c341 EB |
994 | platform_label = rtnl_dereference(net->mpls.platform_label); |
995 | old = rtnl_dereference(platform_label[index]); | |
a2519929 EB |
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 | ||
cf4b24f0 | 1007 | err = -EINVAL; |
a4ac8c98 DA |
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 | ||
074350e2 DA |
1018 | if (nhs == 0) { |
1019 | NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); | |
cf4b24f0 | 1020 | goto errout; |
074350e2 | 1021 | } |
f8efb73c | 1022 | |
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 |
1044 | freert: |
1045 | mpls_rt_free(rt); | |
a2519929 | 1046 | errout: |
a2519929 EB |
1047 | return err; |
1048 | } | |
1049 | ||
074350e2 DA |
1050 | static 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; | |
1065 | errout: | |
1066 | return err; | |
1067 | } | |
1068 | ||
27d69105 RS |
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 { | |
d120d1a6 | 1083 | start = u64_stats_fetch_begin(&p->syncp); |
27d69105 | 1084 | local = p->stats; |
d120d1a6 | 1085 | } while (u64_stats_fetch_retry(&p->syncp, start)); |
27d69105 RS |
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 | ||
24045a03 DA |
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 | 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 | ||
823566ae DA |
1183 | static 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; | |
1203 | errout: | |
1204 | if (err < 0) | |
1205 | rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); | |
1206 | } | |
1207 | ||
1208 | static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { | |
1209 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1210 | }; | |
1211 | ||
0c4056ee JK |
1212 | static int mpls_netconf_valid_get_req(struct sk_buff *skb, |
1213 | const struct nlmsghdr *nlh, | |
1214 | struct nlattr **tb, | |
1215 | struct netlink_ext_ack *extack) | |
1216 | { | |
1217 | int i, err; | |
1218 | ||
1219 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { | |
1220 | NL_SET_ERR_MSG_MOD(extack, | |
1221 | "Invalid header for netconf get request"); | |
1222 | return -EINVAL; | |
1223 | } | |
1224 | ||
1225 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
1226 | return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), |
1227 | tb, NETCONFA_MAX, | |
1228 | devconf_mpls_policy, extack); | |
0c4056ee | 1229 | |
8cb08174 JB |
1230 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), |
1231 | tb, NETCONFA_MAX, | |
1232 | devconf_mpls_policy, extack); | |
0c4056ee JK |
1233 | if (err) |
1234 | return err; | |
1235 | ||
1236 | for (i = 0; i <= NETCONFA_MAX; i++) { | |
1237 | if (!tb[i]) | |
1238 | continue; | |
1239 | ||
1240 | switch (i) { | |
1241 | case NETCONFA_IFINDEX: | |
1242 | break; | |
1243 | default: | |
1244 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); | |
1245 | return -EINVAL; | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | return 0; | |
1250 | } | |
1251 | ||
24045a03 | 1252 | static int mpls_netconf_get_devconf(struct sk_buff *in_skb, |
c21ef3e3 DA |
1253 | struct nlmsghdr *nlh, |
1254 | struct netlink_ext_ack *extack) | |
24045a03 DA |
1255 | { |
1256 | struct net *net = sock_net(in_skb->sk); | |
1257 | struct nlattr *tb[NETCONFA_MAX + 1]; | |
24045a03 DA |
1258 | struct net_device *dev; |
1259 | struct mpls_dev *mdev; | |
1260 | struct sk_buff *skb; | |
1261 | int ifindex; | |
1262 | int err; | |
1263 | ||
0c4056ee | 1264 | err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); |
24045a03 DA |
1265 | if (err < 0) |
1266 | goto errout; | |
1267 | ||
1268 | err = -EINVAL; | |
1269 | if (!tb[NETCONFA_IFINDEX]) | |
1270 | goto errout; | |
1271 | ||
1272 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1273 | dev = __dev_get_by_index(net, ifindex); | |
1274 | if (!dev) | |
1275 | goto errout; | |
1276 | ||
1277 | mdev = mpls_dev_get(dev); | |
1278 | if (!mdev) | |
1279 | goto errout; | |
1280 | ||
1281 | err = -ENOBUFS; | |
1282 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); | |
1283 | if (!skb) | |
1284 | goto errout; | |
1285 | ||
1286 | err = mpls_netconf_fill_devconf(skb, mdev, | |
1287 | NETLINK_CB(in_skb).portid, | |
1288 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
1289 | NETCONFA_ALL); | |
1290 | if (err < 0) { | |
1291 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ | |
1292 | WARN_ON(err == -EMSGSIZE); | |
1293 | kfree_skb(skb); | |
1294 | goto errout; | |
1295 | } | |
1296 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1297 | errout: | |
1298 | return err; | |
1299 | } | |
1300 | ||
1301 | static int mpls_netconf_dump_devconf(struct sk_buff *skb, | |
1302 | struct netlink_callback *cb) | |
1303 | { | |
addd383f | 1304 | const struct nlmsghdr *nlh = cb->nlh; |
24045a03 DA |
1305 | struct net *net = sock_net(skb->sk); |
1306 | struct hlist_head *head; | |
1307 | struct net_device *dev; | |
1308 | struct mpls_dev *mdev; | |
1309 | int idx, s_idx; | |
1310 | int h, s_h; | |
1311 | ||
addd383f DA |
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 | ||
24045a03 DA |
1327 | s_h = cb->args[0]; |
1328 | s_idx = idx = cb->args[1]; | |
1329 | ||
1330 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1331 | idx = 0; | |
1332 | head = &net->dev_index_head[h]; | |
1333 | rcu_read_lock(); | |
1334 | cb->seq = net->dev_base_seq; | |
1335 | hlist_for_each_entry_rcu(dev, head, index_hlist) { | |
1336 | if (idx < s_idx) | |
1337 | goto cont; | |
1338 | mdev = mpls_dev_get(dev); | |
1339 | if (!mdev) | |
1340 | goto cont; | |
1341 | if (mpls_netconf_fill_devconf(skb, mdev, | |
1342 | NETLINK_CB(cb->skb).portid, | |
addd383f | 1343 | nlh->nlmsg_seq, |
24045a03 DA |
1344 | RTM_NEWNETCONF, |
1345 | NLM_F_MULTI, | |
1346 | NETCONFA_ALL) < 0) { | |
1347 | rcu_read_unlock(); | |
1348 | goto done; | |
1349 | } | |
1350 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
1351 | cont: | |
1352 | idx++; | |
1353 | } | |
1354 | rcu_read_unlock(); | |
1355 | } | |
1356 | done: | |
1357 | cb->args[0] = h; | |
1358 | cb->args[1] = idx; | |
1359 | ||
1360 | return skb->len; | |
1361 | } | |
1362 | ||
37bde799 RS |
1363 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
1364 | (&((struct mpls_dev *)0)->field) | |
1365 | ||
24045a03 | 1366 | static int mpls_conf_proc(struct ctl_table *ctl, int write, |
32927393 | 1367 | void *buffer, size_t *lenp, loff_t *ppos) |
24045a03 DA |
1368 | { |
1369 | int oval = *(int *)ctl->data; | |
1370 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1371 | ||
1372 | if (write) { | |
1373 | struct mpls_dev *mdev = ctl->extra1; | |
1374 | int i = (int *)ctl->data - (int *)mdev; | |
1375 | struct net *net = ctl->extra2; | |
1376 | int val = *(int *)ctl->data; | |
1377 | ||
1378 | if (i == offsetof(struct mpls_dev, input_enabled) && | |
1379 | val != oval) { | |
823566ae DA |
1380 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1381 | NETCONFA_INPUT, mdev); | |
24045a03 DA |
1382 | } |
1383 | } | |
1384 | ||
1385 | return ret; | |
1386 | } | |
1387 | ||
37bde799 RS |
1388 | static const struct ctl_table mpls_dev_table[] = { |
1389 | { | |
1390 | .procname = "input", | |
1391 | .maxlen = sizeof(int), | |
1392 | .mode = 0644, | |
24045a03 | 1393 | .proc_handler = mpls_conf_proc, |
37bde799 RS |
1394 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), |
1395 | }, | |
1396 | { } | |
1397 | }; | |
1398 | ||
1399 | static int mpls_dev_sysctl_register(struct net_device *dev, | |
1400 | struct mpls_dev *mdev) | |
1401 | { | |
1402 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; | |
24045a03 | 1403 | struct net *net = dev_net(dev); |
37bde799 RS |
1404 | struct ctl_table *table; |
1405 | int i; | |
1406 | ||
1407 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); | |
1408 | if (!table) | |
1409 | goto out; | |
1410 | ||
1411 | /* Table data contains only offsets relative to the base of | |
1412 | * the mdev at this point, so make them absolute. | |
1413 | */ | |
24045a03 | 1414 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { |
37bde799 | 1415 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; |
24045a03 DA |
1416 | table[i].extra1 = mdev; |
1417 | table[i].extra2 = net; | |
1418 | } | |
37bde799 RS |
1419 | |
1420 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); | |
1421 | ||
c899710f JG |
1422 | mdev->sysctl = register_net_sysctl_sz(net, path, table, |
1423 | ARRAY_SIZE(mpls_dev_table)); | |
37bde799 RS |
1424 | if (!mdev->sysctl) |
1425 | goto free; | |
1426 | ||
1182e4d0 | 1427 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); |
37bde799 RS |
1428 | return 0; |
1429 | ||
1430 | free: | |
1431 | kfree(table); | |
1432 | out: | |
fda6c89f | 1433 | mdev->sysctl = NULL; |
37bde799 RS |
1434 | return -ENOBUFS; |
1435 | } | |
1436 | ||
1182e4d0 DA |
1437 | static void mpls_dev_sysctl_unregister(struct net_device *dev, |
1438 | struct mpls_dev *mdev) | |
37bde799 | 1439 | { |
1182e4d0 | 1440 | struct net *net = dev_net(dev); |
37bde799 RS |
1441 | struct ctl_table *table; |
1442 | ||
fda6c89f JK |
1443 | if (!mdev->sysctl) |
1444 | return; | |
1445 | ||
37bde799 RS |
1446 | table = mdev->sysctl->ctl_table_arg; |
1447 | unregister_net_sysctl_table(mdev->sysctl); | |
1448 | kfree(table); | |
1182e4d0 DA |
1449 | |
1450 | mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); | |
37bde799 RS |
1451 | } |
1452 | ||
03c57747 RS |
1453 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
1454 | { | |
1455 | struct mpls_dev *mdev; | |
1456 | int err = -ENOMEM; | |
27d69105 | 1457 | int i; |
03c57747 RS |
1458 | |
1459 | ASSERT_RTNL(); | |
1460 | ||
1461 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); | |
1462 | if (!mdev) | |
1463 | return ERR_PTR(err); | |
1464 | ||
27d69105 RS |
1465 | mdev->stats = alloc_percpu(struct mpls_pcpu_stats); |
1466 | if (!mdev->stats) | |
1467 | goto free; | |
1468 | ||
1469 | for_each_possible_cpu(i) { | |
1470 | struct mpls_pcpu_stats *mpls_stats; | |
1471 | ||
1472 | mpls_stats = per_cpu_ptr(mdev->stats, i); | |
1473 | u64_stats_init(&mpls_stats->syncp); | |
1474 | } | |
1475 | ||
1182e4d0 DA |
1476 | mdev->dev = dev; |
1477 | ||
37bde799 RS |
1478 | err = mpls_dev_sysctl_register(dev, mdev); |
1479 | if (err) | |
1480 | goto free; | |
1481 | ||
03c57747 RS |
1482 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
1483 | ||
1484 | return mdev; | |
37bde799 RS |
1485 | |
1486 | free: | |
27d69105 | 1487 | free_percpu(mdev->stats); |
37bde799 RS |
1488 | kfree(mdev); |
1489 | return ERR_PTR(err); | |
03c57747 RS |
1490 | } |
1491 | ||
27d69105 RS |
1492 | static void mpls_dev_destroy_rcu(struct rcu_head *head) |
1493 | { | |
1494 | struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); | |
1495 | ||
1496 | free_percpu(mdev->stats); | |
1497 | kfree(mdev); | |
1498 | } | |
1499 | ||
7d4741ea | 1500 | static int mpls_ifdown(struct net_device *dev, int event) |
0189197f | 1501 | { |
19d0c341 | 1502 | struct mpls_route __rcu **platform_label; |
0189197f EB |
1503 | struct net *net = dev_net(dev); |
1504 | unsigned index; | |
1505 | ||
19d0c341 | 1506 | platform_label = rtnl_dereference(net->mpls.platform_label); |
0189197f | 1507 | for (index = 0; index < net->mpls.platform_labels; index++) { |
19d0c341 | 1508 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
7d4741ea BP |
1509 | bool nh_del = false; |
1510 | u8 alive = 0; | |
c89359a4 | 1511 | |
0189197f EB |
1512 | if (!rt) |
1513 | continue; | |
c89359a4 | 1514 | |
7d4741ea BP |
1515 | if (event == NETDEV_UNREGISTER) { |
1516 | u8 deleted = 0; | |
1517 | ||
1518 | for_nexthops(rt) { | |
18916818 | 1519 | if (!nh->nh_dev || nh->nh_dev == dev) |
7d4741ea | 1520 | deleted++; |
18916818 | 1521 | if (nh->nh_dev == dev) |
7d4741ea BP |
1522 | nh_del = true; |
1523 | } endfor_nexthops(rt); | |
1524 | ||
1525 | /* if there are no more nexthops, delete the route */ | |
1526 | if (deleted == rt->rt_nhn) { | |
1527 | mpls_route_update(net, index, NULL, NULL); | |
1528 | continue; | |
1529 | } | |
1530 | ||
1531 | if (nh_del) { | |
1532 | size_t size = sizeof(*rt) + rt->rt_nhn * | |
1533 | rt->rt_nh_size; | |
1534 | struct mpls_route *orig = rt; | |
1535 | ||
27a5a568 | 1536 | rt = kmemdup(orig, size, GFP_KERNEL); |
7d4741ea BP |
1537 | if (!rt) |
1538 | return -ENOMEM; | |
7d4741ea BP |
1539 | } |
1540 | } | |
1541 | ||
c89359a4 | 1542 | change_nexthops(rt) { |
39eb8cd1 DA |
1543 | unsigned int nh_flags = nh->nh_flags; |
1544 | ||
18916818 | 1545 | if (nh->nh_dev != dev) |
61733c91 DA |
1546 | goto next; |
1547 | ||
c89359a4 RP |
1548 | switch (event) { |
1549 | case NETDEV_DOWN: | |
1550 | case NETDEV_UNREGISTER: | |
39eb8cd1 | 1551 | nh_flags |= RTNH_F_DEAD; |
df561f66 | 1552 | fallthrough; |
c89359a4 | 1553 | case NETDEV_CHANGE: |
39eb8cd1 | 1554 | nh_flags |= RTNH_F_LINKDOWN; |
c89359a4 RP |
1555 | break; |
1556 | } | |
1557 | if (event == NETDEV_UNREGISTER) | |
18916818 | 1558 | nh->nh_dev = NULL; |
39eb8cd1 DA |
1559 | |
1560 | if (nh->nh_flags != nh_flags) | |
1561 | WRITE_ONCE(nh->nh_flags, nh_flags); | |
61733c91 | 1562 | next: |
39eb8cd1 | 1563 | if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) |
61733c91 | 1564 | alive++; |
f8efb73c | 1565 | } endfor_nexthops(rt); |
61733c91 DA |
1566 | |
1567 | WRITE_ONCE(rt->rt_nhn_alive, alive); | |
4ea8efad | 1568 | |
7d4741ea BP |
1569 | if (nh_del) |
1570 | mpls_route_update(net, index, rt, NULL); | |
0189197f | 1571 | } |
7d4741ea BP |
1572 | |
1573 | return 0; | |
c89359a4 RP |
1574 | } |
1575 | ||
39eb8cd1 | 1576 | static void mpls_ifup(struct net_device *dev, unsigned int flags) |
c89359a4 RP |
1577 | { |
1578 | struct mpls_route __rcu **platform_label; | |
1579 | struct net *net = dev_net(dev); | |
1580 | unsigned index; | |
77ef013a | 1581 | u8 alive; |
c89359a4 RP |
1582 | |
1583 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
1584 | for (index = 0; index < net->mpls.platform_labels; index++) { | |
1585 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
1586 | ||
1587 | if (!rt) | |
1588 | continue; | |
37bde799 | 1589 | |
c89359a4 RP |
1590 | alive = 0; |
1591 | change_nexthops(rt) { | |
39eb8cd1 | 1592 | unsigned int nh_flags = nh->nh_flags; |
03c57747 | 1593 | |
39eb8cd1 | 1594 | if (!(nh_flags & flags)) { |
c89359a4 RP |
1595 | alive++; |
1596 | continue; | |
1597 | } | |
18916818 | 1598 | if (nh->nh_dev != dev) |
c89359a4 RP |
1599 | continue; |
1600 | alive++; | |
39eb8cd1 | 1601 | nh_flags &= ~flags; |
c2e8471d | 1602 | WRITE_ONCE(nh->nh_flags, nh_flags); |
c89359a4 RP |
1603 | } endfor_nexthops(rt); |
1604 | ||
39eb8cd1 | 1605 | WRITE_ONCE(rt->rt_nhn_alive, alive); |
c89359a4 | 1606 | } |
0189197f EB |
1607 | } |
1608 | ||
1609 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, | |
1610 | void *ptr) | |
1611 | { | |
1612 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
03c57747 | 1613 | struct mpls_dev *mdev; |
c89359a4 | 1614 | unsigned int flags; |
c4416f5c | 1615 | int err; |
0189197f | 1616 | |
c89359a4 | 1617 | if (event == NETDEV_REGISTER) { |
350e7ab9 MV |
1618 | mdev = mpls_add_dev(dev); |
1619 | if (IS_ERR(mdev)) | |
1620 | return notifier_from_errno(PTR_ERR(mdev)); | |
d8e2262a | 1621 | |
c89359a4 RP |
1622 | return NOTIFY_OK; |
1623 | } | |
03c57747 | 1624 | |
c89359a4 RP |
1625 | mdev = mpls_dev_get(dev); |
1626 | if (!mdev) | |
1627 | return NOTIFY_OK; | |
1628 | ||
1629 | switch (event) { | |
7d4741ea | 1630 | |
c89359a4 | 1631 | case NETDEV_DOWN: |
7d4741ea BP |
1632 | err = mpls_ifdown(dev, event); |
1633 | if (err) | |
1634 | return notifier_from_errno(err); | |
c89359a4 RP |
1635 | break; |
1636 | case NETDEV_UP: | |
1637 | flags = dev_get_flags(dev); | |
1638 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1639 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1640 | else | |
1641 | mpls_ifup(dev, RTNH_F_DEAD); | |
1642 | break; | |
1643 | case NETDEV_CHANGE: | |
1644 | flags = dev_get_flags(dev); | |
7d4741ea | 1645 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { |
c89359a4 | 1646 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); |
7d4741ea BP |
1647 | } else { |
1648 | err = mpls_ifdown(dev, event); | |
1649 | if (err) | |
1650 | return notifier_from_errno(err); | |
1651 | } | |
c89359a4 | 1652 | break; |
0189197f | 1653 | case NETDEV_UNREGISTER: |
7d4741ea BP |
1654 | err = mpls_ifdown(dev, event); |
1655 | if (err) | |
1656 | return notifier_from_errno(err); | |
c89359a4 RP |
1657 | mdev = mpls_dev_get(dev); |
1658 | if (mdev) { | |
1182e4d0 | 1659 | mpls_dev_sysctl_unregister(dev, mdev); |
c89359a4 | 1660 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); |
27d69105 | 1661 | call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); |
c89359a4 | 1662 | } |
0189197f | 1663 | break; |
0fae3bf0 RS |
1664 | case NETDEV_CHANGENAME: |
1665 | mdev = mpls_dev_get(dev); | |
1666 | if (mdev) { | |
1182e4d0 | 1667 | mpls_dev_sysctl_unregister(dev, mdev); |
0fae3bf0 RS |
1668 | err = mpls_dev_sysctl_register(dev, mdev); |
1669 | if (err) | |
1670 | return notifier_from_errno(err); | |
1671 | } | |
1672 | break; | |
0189197f EB |
1673 | } |
1674 | return NOTIFY_OK; | |
1675 | } | |
1676 | ||
1677 | static struct notifier_block mpls_dev_notifier = { | |
1678 | .notifier_call = mpls_dev_notify, | |
1679 | }; | |
1680 | ||
03c05665 | 1681 | static int nla_put_via(struct sk_buff *skb, |
b79bda3d | 1682 | u8 table, const void *addr, int alen) |
03c05665 | 1683 | { |
b79bda3d EB |
1684 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
1685 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, | |
1686 | }; | |
03c05665 EB |
1687 | struct nlattr *nla; |
1688 | struct rtvia *via; | |
b79bda3d | 1689 | int family = AF_UNSPEC; |
03c05665 EB |
1690 | |
1691 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
1692 | if (!nla) | |
1693 | return -EMSGSIZE; | |
1694 | ||
b79bda3d EB |
1695 | if (table <= NEIGH_NR_TABLES) |
1696 | family = table_to_family[table]; | |
1697 | ||
03c05665 EB |
1698 | via = nla_data(nla); |
1699 | via->rtvia_family = family; | |
1700 | memcpy(via->rtvia_addr, addr, alen); | |
1701 | return 0; | |
1702 | } | |
1703 | ||
966bae33 EB |
1704 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
1705 | u8 labels, const u32 label[]) | |
1706 | { | |
1707 | struct nlattr *nla; | |
1708 | struct mpls_shim_hdr *nla_label; | |
1709 | bool bos; | |
1710 | int i; | |
1711 | nla = nla_reserve(skb, attrtype, labels*4); | |
1712 | if (!nla) | |
1713 | return -EMSGSIZE; | |
1714 | ||
1715 | nla_label = nla_data(nla); | |
1716 | bos = true; | |
1717 | for (i = labels - 1; i >= 0; i--) { | |
1718 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); | |
1719 | bos = false; | |
1720 | } | |
1721 | ||
1722 | return 0; | |
1723 | } | |
face0188 | 1724 | EXPORT_SYMBOL_GPL(nla_put_labels); |
966bae33 | 1725 | |
a1f10abe DA |
1726 | int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, |
1727 | u32 label[], struct netlink_ext_ack *extack) | |
966bae33 EB |
1728 | { |
1729 | unsigned len = nla_len(nla); | |
966bae33 | 1730 | struct mpls_shim_hdr *nla_label; |
a4ac8c98 | 1731 | u8 nla_labels; |
966bae33 EB |
1732 | bool bos; |
1733 | int i; | |
1734 | ||
a4ac8c98 DA |
1735 | /* len needs to be an even multiple of 4 (the label size). Number |
1736 | * of labels is a u8 so check for overflow. | |
1737 | */ | |
a1f10abe DA |
1738 | if (len & 3 || len / 4 > 255) { |
1739 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1740 | "Invalid length for labels attribute"); | |
966bae33 | 1741 | return -EINVAL; |
a1f10abe | 1742 | } |
966bae33 EB |
1743 | |
1744 | /* Limit the number of new labels allowed */ | |
1745 | nla_labels = len/4; | |
a1f10abe DA |
1746 | if (nla_labels > max_labels) { |
1747 | NL_SET_ERR_MSG(extack, "Too many labels"); | |
966bae33 | 1748 | return -EINVAL; |
a1f10abe | 1749 | } |
966bae33 | 1750 | |
a4ac8c98 DA |
1751 | /* when label == NULL, caller wants number of labels */ |
1752 | if (!label) | |
1753 | goto out; | |
1754 | ||
966bae33 EB |
1755 | nla_label = nla_data(nla); |
1756 | bos = true; | |
1757 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { | |
1758 | struct mpls_entry_decoded dec; | |
1759 | dec = mpls_entry_decode(nla_label + i); | |
1760 | ||
1761 | /* Ensure the bottom of stack flag is properly set | |
1762 | * and ttl and tc are both clear. | |
1763 | */ | |
a1f10abe DA |
1764 | if (dec.ttl) { |
1765 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1766 | "TTL in label must be 0"); | |
1767 | return -EINVAL; | |
1768 | } | |
1769 | ||
1770 | if (dec.tc) { | |
1771 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1772 | "Traffic class in label must be 0"); | |
966bae33 | 1773 | return -EINVAL; |
a1f10abe DA |
1774 | } |
1775 | ||
1776 | if (dec.bos != bos) { | |
1777 | NL_SET_BAD_ATTR(extack, nla); | |
1778 | if (bos) { | |
1779 | NL_SET_ERR_MSG(extack, | |
1780 | "BOS bit must be set in first label"); | |
1781 | } else { | |
1782 | NL_SET_ERR_MSG(extack, | |
1783 | "BOS bit can only be set in first label"); | |
1784 | } | |
1785 | return -EINVAL; | |
1786 | } | |
966bae33 | 1787 | |
5a9ab017 | 1788 | switch (dec.label) { |
78f5b899 | 1789 | case MPLS_LABEL_IMPLNULL: |
5a9ab017 RS |
1790 | /* RFC3032: This is a label that an LSR may |
1791 | * assign and distribute, but which never | |
1792 | * actually appears in the encapsulation. | |
1793 | */ | |
a1f10abe DA |
1794 | NL_SET_ERR_MSG_ATTR(extack, nla, |
1795 | "Implicit NULL Label (3) can not be used in encapsulation"); | |
5a9ab017 RS |
1796 | return -EINVAL; |
1797 | } | |
1798 | ||
966bae33 EB |
1799 | label[i] = dec.label; |
1800 | } | |
a4ac8c98 | 1801 | out: |
966bae33 EB |
1802 | *labels = nla_labels; |
1803 | return 0; | |
1804 | } | |
face0188 | 1805 | EXPORT_SYMBOL_GPL(nla_get_labels); |
966bae33 | 1806 | |
074350e2 DA |
1807 | static int rtm_to_route_config(struct sk_buff *skb, |
1808 | struct nlmsghdr *nlh, | |
1809 | struct mpls_route_config *cfg, | |
1810 | struct netlink_ext_ack *extack) | |
03c05665 EB |
1811 | { |
1812 | struct rtmsg *rtm; | |
1813 | struct nlattr *tb[RTA_MAX+1]; | |
1814 | int index; | |
1815 | int err; | |
1816 | ||
8cb08174 JB |
1817 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
1818 | rtm_mpls_policy, extack); | |
03c05665 EB |
1819 | if (err < 0) |
1820 | goto errout; | |
1821 | ||
1822 | err = -EINVAL; | |
1823 | rtm = nlmsg_data(nlh); | |
03c05665 | 1824 | |
074350e2 DA |
1825 | if (rtm->rtm_family != AF_MPLS) { |
1826 | NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); | |
03c05665 | 1827 | goto errout; |
074350e2 DA |
1828 | } |
1829 | if (rtm->rtm_dst_len != 20) { | |
1830 | NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); | |
03c05665 | 1831 | goto errout; |
074350e2 DA |
1832 | } |
1833 | if (rtm->rtm_src_len != 0) { | |
1834 | NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); | |
03c05665 | 1835 | goto errout; |
074350e2 DA |
1836 | } |
1837 | if (rtm->rtm_tos != 0) { | |
1838 | NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); | |
03c05665 | 1839 | goto errout; |
074350e2 DA |
1840 | } |
1841 | if (rtm->rtm_table != RT_TABLE_MAIN) { | |
1842 | NL_SET_ERR_MSG(extack, | |
1843 | "MPLS only supports the main route table"); | |
03c05665 | 1844 | goto errout; |
074350e2 | 1845 | } |
03c05665 EB |
1846 | /* Any value is acceptable for rtm_protocol */ |
1847 | ||
1848 | /* As mpls uses destination specific addresses | |
1849 | * (or source specific address in the case of multicast) | |
1850 | * all addresses have universal scope. | |
1851 | */ | |
074350e2 DA |
1852 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { |
1853 | NL_SET_ERR_MSG(extack, | |
1854 | "Invalid route scope - MPLS only supports UNIVERSE"); | |
03c05665 | 1855 | goto errout; |
074350e2 DA |
1856 | } |
1857 | if (rtm->rtm_type != RTN_UNICAST) { | |
1858 | NL_SET_ERR_MSG(extack, | |
1859 | "Invalid route type - MPLS only supports UNICAST"); | |
03c05665 | 1860 | goto errout; |
074350e2 DA |
1861 | } |
1862 | if (rtm->rtm_flags != 0) { | |
1863 | NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); | |
03c05665 | 1864 | goto errout; |
074350e2 | 1865 | } |
03c05665 EB |
1866 | |
1867 | cfg->rc_label = LABEL_NOT_SPECIFIED; | |
1868 | cfg->rc_protocol = rtm->rtm_protocol; | |
eb7809f0 | 1869 | cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
5b441ac8 | 1870 | cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
03c05665 EB |
1871 | cfg->rc_nlflags = nlh->nlmsg_flags; |
1872 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; | |
1873 | cfg->rc_nlinfo.nlh = nlh; | |
1874 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); | |
1875 | ||
1876 | for (index = 0; index <= RTA_MAX; index++) { | |
1877 | struct nlattr *nla = tb[index]; | |
1878 | if (!nla) | |
1879 | continue; | |
1880 | ||
14dd3e1b | 1881 | switch (index) { |
03c05665 EB |
1882 | case RTA_OIF: |
1883 | cfg->rc_ifindex = nla_get_u32(nla); | |
1884 | break; | |
1885 | case RTA_NEWDST: | |
1886 | if (nla_get_labels(nla, MAX_NEW_LABELS, | |
1887 | &cfg->rc_output_labels, | |
074350e2 | 1888 | cfg->rc_output_label, extack)) |
03c05665 EB |
1889 | goto errout; |
1890 | break; | |
1891 | case RTA_DST: | |
1892 | { | |
f8efb73c | 1893 | u8 label_count; |
03c05665 | 1894 | if (nla_get_labels(nla, 1, &label_count, |
074350e2 | 1895 | &cfg->rc_label, extack)) |
03c05665 EB |
1896 | goto errout; |
1897 | ||
b7b386f4 | 1898 | if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, |
3968523f | 1899 | &cfg->rc_label, extack)) |
03c05665 | 1900 | goto errout; |
03c05665 EB |
1901 | break; |
1902 | } | |
be48220e DA |
1903 | case RTA_GATEWAY: |
1904 | NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); | |
1905 | goto errout; | |
03c05665 EB |
1906 | case RTA_VIA: |
1907 | { | |
f8efb73c | 1908 | if (nla_get_via(nla, &cfg->rc_via_alen, |
074350e2 DA |
1909 | &cfg->rc_via_table, cfg->rc_via, |
1910 | extack)) | |
03c05665 | 1911 | goto errout; |
f8efb73c RP |
1912 | break; |
1913 | } | |
1914 | case RTA_MULTIPATH: | |
1915 | { | |
1916 | cfg->rc_mp = nla_data(nla); | |
1917 | cfg->rc_mp_len = nla_len(nla); | |
03c05665 EB |
1918 | break; |
1919 | } | |
5b441ac8 RS |
1920 | case RTA_TTL_PROPAGATE: |
1921 | { | |
1922 | u8 ttl_propagate = nla_get_u8(nla); | |
1923 | ||
074350e2 DA |
1924 | if (ttl_propagate > 1) { |
1925 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1926 | "RTA_TTL_PROPAGATE can only be 0 or 1"); | |
5b441ac8 | 1927 | goto errout; |
074350e2 | 1928 | } |
5b441ac8 RS |
1929 | cfg->rc_ttl_propagate = ttl_propagate ? |
1930 | MPLS_TTL_PROP_ENABLED : | |
1931 | MPLS_TTL_PROP_DISABLED; | |
1932 | break; | |
1933 | } | |
03c05665 | 1934 | default: |
074350e2 | 1935 | NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); |
03c05665 EB |
1936 | /* Unsupported attribute */ |
1937 | goto errout; | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | err = 0; | |
1942 | errout: | |
1943 | return err; | |
1944 | } | |
1945 | ||
c21ef3e3 DA |
1946 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
1947 | struct netlink_ext_ack *extack) | |
03c05665 | 1948 | { |
a4ac8c98 | 1949 | struct mpls_route_config *cfg; |
03c05665 EB |
1950 | int err; |
1951 | ||
a4ac8c98 DA |
1952 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
1953 | if (!cfg) | |
1954 | return -ENOMEM; | |
1955 | ||
074350e2 | 1956 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
03c05665 | 1957 | if (err < 0) |
a4ac8c98 | 1958 | goto out; |
03c05665 | 1959 | |
074350e2 | 1960 | err = mpls_route_del(cfg, extack); |
a4ac8c98 DA |
1961 | out: |
1962 | kfree(cfg); | |
1963 | ||
1964 | return err; | |
03c05665 EB |
1965 | } |
1966 | ||
1967 | ||
c21ef3e3 DA |
1968 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
1969 | struct netlink_ext_ack *extack) | |
03c05665 | 1970 | { |
a4ac8c98 | 1971 | struct mpls_route_config *cfg; |
03c05665 EB |
1972 | int err; |
1973 | ||
a4ac8c98 DA |
1974 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
1975 | if (!cfg) | |
1976 | return -ENOMEM; | |
1977 | ||
074350e2 | 1978 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
03c05665 | 1979 | if (err < 0) |
a4ac8c98 | 1980 | goto out; |
03c05665 | 1981 | |
074350e2 | 1982 | err = mpls_route_add(cfg, extack); |
a4ac8c98 DA |
1983 | out: |
1984 | kfree(cfg); | |
1985 | ||
1986 | return err; | |
03c05665 EB |
1987 | } |
1988 | ||
1989 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, | |
1990 | u32 label, struct mpls_route *rt, int flags) | |
1991 | { | |
19d0c341 | 1992 | struct net_device *dev; |
03c05665 EB |
1993 | struct nlmsghdr *nlh; |
1994 | struct rtmsg *rtm; | |
1995 | ||
1996 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); | |
1997 | if (nlh == NULL) | |
1998 | return -EMSGSIZE; | |
1999 | ||
2000 | rtm = nlmsg_data(nlh); | |
2001 | rtm->rtm_family = AF_MPLS; | |
2002 | rtm->rtm_dst_len = 20; | |
2003 | rtm->rtm_src_len = 0; | |
2004 | rtm->rtm_tos = 0; | |
2005 | rtm->rtm_table = RT_TABLE_MAIN; | |
2006 | rtm->rtm_protocol = rt->rt_protocol; | |
2007 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2008 | rtm->rtm_type = RTN_UNICAST; | |
2009 | rtm->rtm_flags = 0; | |
2010 | ||
03c05665 EB |
2011 | if (nla_put_labels(skb, RTA_DST, 1, &label)) |
2012 | goto nla_put_failure; | |
5b441ac8 RS |
2013 | |
2014 | if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { | |
2015 | bool ttl_propagate = | |
2016 | rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; | |
2017 | ||
2018 | if (nla_put_u8(skb, RTA_TTL_PROPAGATE, | |
2019 | ttl_propagate)) | |
2020 | goto nla_put_failure; | |
2021 | } | |
f8efb73c | 2022 | if (rt->rt_nhn == 1) { |
cf4b24f0 | 2023 | const struct mpls_nh *nh = rt->rt_nh; |
f8efb73c RP |
2024 | |
2025 | if (nh->nh_labels && | |
2026 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
2027 | nh->nh_label)) | |
2028 | goto nla_put_failure; | |
eb7809f0 | 2029 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
72dcac96 | 2030 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
f8efb73c RP |
2031 | nh->nh_via_alen)) |
2032 | goto nla_put_failure; | |
18916818 | 2033 | dev = nh->nh_dev; |
f8efb73c RP |
2034 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) |
2035 | goto nla_put_failure; | |
c89359a4 RP |
2036 | if (nh->nh_flags & RTNH_F_LINKDOWN) |
2037 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
2038 | if (nh->nh_flags & RTNH_F_DEAD) | |
2039 | rtm->rtm_flags |= RTNH_F_DEAD; | |
f8efb73c RP |
2040 | } else { |
2041 | struct rtnexthop *rtnh; | |
2042 | struct nlattr *mp; | |
77ef013a DA |
2043 | u8 linkdown = 0; |
2044 | u8 dead = 0; | |
f8efb73c | 2045 | |
ae0be8de | 2046 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f8efb73c RP |
2047 | if (!mp) |
2048 | goto nla_put_failure; | |
2049 | ||
2050 | for_nexthops(rt) { | |
18916818 | 2051 | dev = nh->nh_dev; |
c00e51dd DA |
2052 | if (!dev) |
2053 | continue; | |
2054 | ||
f8efb73c RP |
2055 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
2056 | if (!rtnh) | |
2057 | goto nla_put_failure; | |
2058 | ||
c00e51dd | 2059 | rtnh->rtnh_ifindex = dev->ifindex; |
c89359a4 RP |
2060 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
2061 | rtnh->rtnh_flags |= RTNH_F_LINKDOWN; | |
2062 | linkdown++; | |
2063 | } | |
2064 | if (nh->nh_flags & RTNH_F_DEAD) { | |
2065 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
2066 | dead++; | |
2067 | } | |
2068 | ||
f8efb73c RP |
2069 | if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, |
2070 | nh->nh_labels, | |
2071 | nh->nh_label)) | |
2072 | goto nla_put_failure; | |
f20367df RS |
2073 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
2074 | nla_put_via(skb, nh->nh_via_table, | |
cf4b24f0 | 2075 | mpls_nh_via(rt, nh), |
f8efb73c RP |
2076 | nh->nh_via_alen)) |
2077 | goto nla_put_failure; | |
2078 | ||
2079 | /* length of rtnetlink header + attributes */ | |
2080 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
2081 | } endfor_nexthops(rt); | |
2082 | ||
c89359a4 RP |
2083 | if (linkdown == rt->rt_nhn) |
2084 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
2085 | if (dead == rt->rt_nhn) | |
2086 | rtm->rtm_flags |= RTNH_F_DEAD; | |
2087 | ||
f8efb73c RP |
2088 | nla_nest_end(skb, mp); |
2089 | } | |
03c05665 EB |
2090 | |
2091 | nlmsg_end(skb, nlh); | |
2092 | return 0; | |
2093 | ||
2094 | nla_put_failure: | |
2095 | nlmsg_cancel(skb, nlh); | |
2096 | return -EMSGSIZE; | |
2097 | } | |
2098 | ||
d8a66aa2 | 2099 | #if IS_ENABLED(CONFIG_INET) |
4724676d DA |
2100 | static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
2101 | struct fib_dump_filter *filter, | |
effe6792 | 2102 | struct netlink_callback *cb) |
d8a66aa2 | 2103 | { |
effe6792 | 2104 | return ip_valid_fib_dump_req(net, nlh, filter, cb); |
d8a66aa2 DA |
2105 | } |
2106 | #else | |
4724676d DA |
2107 | static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
2108 | struct fib_dump_filter *filter, | |
effe6792 | 2109 | struct netlink_callback *cb) |
d8a66aa2 | 2110 | { |
effe6792 | 2111 | struct netlink_ext_ack *extack = cb->extack; |
196cfebf | 2112 | struct nlattr *tb[RTA_MAX + 1]; |
d8a66aa2 | 2113 | struct rtmsg *rtm; |
196cfebf | 2114 | int err, i; |
d8a66aa2 DA |
2115 | |
2116 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
2117 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); | |
2118 | return -EINVAL; | |
2119 | } | |
2120 | ||
2121 | rtm = nlmsg_data(nlh); | |
2122 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || | |
196cfebf DA |
2123 | rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || |
2124 | rtm->rtm_flags) { | |
d8a66aa2 DA |
2125 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); |
2126 | return -EINVAL; | |
2127 | } | |
2128 | ||
196cfebf DA |
2129 | if (rtm->rtm_protocol) { |
2130 | filter->protocol = rtm->rtm_protocol; | |
2131 | filter->filter_set = 1; | |
2132 | cb->answer_flags = NLM_F_DUMP_FILTERED; | |
2133 | } | |
2134 | ||
8cb08174 JB |
2135 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
2136 | rtm_mpls_policy, extack); | |
196cfebf DA |
2137 | if (err < 0) |
2138 | return err; | |
2139 | ||
2140 | for (i = 0; i <= RTA_MAX; ++i) { | |
2141 | int ifindex; | |
2142 | ||
2143 | if (i == RTA_OIF) { | |
2144 | ifindex = nla_get_u32(tb[i]); | |
2145 | filter->dev = __dev_get_by_index(net, ifindex); | |
2146 | if (!filter->dev) | |
2147 | return -ENODEV; | |
2148 | filter->filter_set = 1; | |
2149 | } else if (tb[i]) { | |
2150 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); | |
2151 | return -EINVAL; | |
2152 | } | |
d8a66aa2 DA |
2153 | } |
2154 | ||
2155 | return 0; | |
2156 | } | |
2157 | #endif | |
2158 | ||
bae9a78b DA |
2159 | static bool mpls_rt_uses_dev(struct mpls_route *rt, |
2160 | const struct net_device *dev) | |
2161 | { | |
bae9a78b DA |
2162 | if (rt->rt_nhn == 1) { |
2163 | struct mpls_nh *nh = rt->rt_nh; | |
2164 | ||
18916818 | 2165 | if (nh->nh_dev == dev) |
bae9a78b DA |
2166 | return true; |
2167 | } else { | |
2168 | for_nexthops(rt) { | |
18916818 | 2169 | if (nh->nh_dev == dev) |
bae9a78b DA |
2170 | return true; |
2171 | } endfor_nexthops(rt); | |
2172 | } | |
2173 | ||
2174 | return false; | |
2175 | } | |
2176 | ||
03c05665 EB |
2177 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) |
2178 | { | |
e8ba330a | 2179 | const struct nlmsghdr *nlh = cb->nlh; |
03c05665 | 2180 | struct net *net = sock_net(skb->sk); |
19d0c341 | 2181 | struct mpls_route __rcu **platform_label; |
4724676d | 2182 | struct fib_dump_filter filter = {}; |
bae9a78b | 2183 | unsigned int flags = NLM_F_MULTI; |
19d0c341 | 2184 | size_t platform_labels; |
03c05665 EB |
2185 | unsigned int index; |
2186 | ||
2187 | ASSERT_RTNL(); | |
2188 | ||
e8ba330a | 2189 | if (cb->strict_check) { |
4724676d | 2190 | int err; |
e8ba330a | 2191 | |
effe6792 | 2192 | err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); |
e8ba330a DA |
2193 | if (err < 0) |
2194 | return err; | |
bae9a78b DA |
2195 | |
2196 | /* for MPLS, there is only 1 table with fixed type and flags. | |
2197 | * If either are set in the filter then return nothing. | |
2198 | */ | |
2199 | if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || | |
2200 | (filter.rt_type && filter.rt_type != RTN_UNICAST) || | |
2201 | filter.flags) | |
2202 | return skb->len; | |
e8ba330a DA |
2203 | } |
2204 | ||
03c05665 | 2205 | index = cb->args[0]; |
a6affd24 RS |
2206 | if (index < MPLS_LABEL_FIRST_UNRESERVED) |
2207 | index = MPLS_LABEL_FIRST_UNRESERVED; | |
03c05665 | 2208 | |
19d0c341 EB |
2209 | platform_label = rtnl_dereference(net->mpls.platform_label); |
2210 | platform_labels = net->mpls.platform_labels; | |
bae9a78b DA |
2211 | |
2212 | if (filter.filter_set) | |
2213 | flags |= NLM_F_DUMP_FILTERED; | |
2214 | ||
19d0c341 | 2215 | for (; index < platform_labels; index++) { |
03c05665 | 2216 | struct mpls_route *rt; |
bae9a78b | 2217 | |
19d0c341 | 2218 | rt = rtnl_dereference(platform_label[index]); |
03c05665 EB |
2219 | if (!rt) |
2220 | continue; | |
2221 | ||
bae9a78b DA |
2222 | if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || |
2223 | (filter.protocol && rt->rt_protocol != filter.protocol)) | |
2224 | continue; | |
2225 | ||
03c05665 EB |
2226 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, |
2227 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, | |
bae9a78b | 2228 | index, rt, flags) < 0) |
03c05665 EB |
2229 | break; |
2230 | } | |
2231 | cb->args[0] = index; | |
2232 | ||
2233 | return skb->len; | |
2234 | } | |
2235 | ||
8de147dc EB |
2236 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
2237 | { | |
2238 | size_t payload = | |
2239 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
5b441ac8 RS |
2240 | + nla_total_size(4) /* RTA_DST */ |
2241 | + nla_total_size(1); /* RTA_TTL_PROPAGATE */ | |
f8efb73c RP |
2242 | |
2243 | if (rt->rt_nhn == 1) { | |
2244 | struct mpls_nh *nh = rt->rt_nh; | |
2245 | ||
2246 | if (nh->nh_dev) | |
2247 | payload += nla_total_size(4); /* RTA_OIF */ | |
eb7809f0 | 2248 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ |
72dcac96 | 2249 | payload += nla_total_size(2 + nh->nh_via_alen); |
f8efb73c RP |
2250 | if (nh->nh_labels) /* RTA_NEWDST */ |
2251 | payload += nla_total_size(nh->nh_labels * 4); | |
2252 | } else { | |
2253 | /* each nexthop is packed in an attribute */ | |
2254 | size_t nhsize = 0; | |
2255 | ||
2256 | for_nexthops(rt) { | |
18916818 | 2257 | if (!nh->nh_dev) |
e944e97a | 2258 | continue; |
f8efb73c | 2259 | nhsize += nla_total_size(sizeof(struct rtnexthop)); |
f20367df RS |
2260 | /* RTA_VIA */ |
2261 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) | |
2262 | nhsize += nla_total_size(2 + nh->nh_via_alen); | |
f8efb73c RP |
2263 | if (nh->nh_labels) |
2264 | nhsize += nla_total_size(nh->nh_labels * 4); | |
2265 | } endfor_nexthops(rt); | |
2266 | /* nested attribute */ | |
2267 | payload += nla_total_size(nhsize); | |
2268 | } | |
2269 | ||
8de147dc EB |
2270 | return payload; |
2271 | } | |
2272 | ||
2273 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, | |
2274 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
2275 | unsigned int nlm_flags) | |
2276 | { | |
2277 | struct sk_buff *skb; | |
2278 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
2279 | int err = -ENOBUFS; | |
2280 | ||
2281 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
2282 | if (skb == NULL) | |
2283 | goto errout; | |
2284 | ||
2285 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); | |
2286 | if (err < 0) { | |
2287 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
2288 | WARN_ON(err == -EMSGSIZE); | |
2289 | kfree_skb(skb); | |
2290 | goto errout; | |
2291 | } | |
2292 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); | |
2293 | ||
2294 | return; | |
2295 | errout: | |
2296 | if (err < 0) | |
2297 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); | |
2298 | } | |
2299 | ||
d77851bf JK |
2300 | static int mpls_valid_getroute_req(struct sk_buff *skb, |
2301 | const struct nlmsghdr *nlh, | |
2302 | struct nlattr **tb, | |
2303 | struct netlink_ext_ack *extack) | |
2304 | { | |
2305 | struct rtmsg *rtm; | |
2306 | int i, err; | |
2307 | ||
2308 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
2309 | NL_SET_ERR_MSG_MOD(extack, | |
2310 | "Invalid header for get route request"); | |
2311 | return -EINVAL; | |
2312 | } | |
2313 | ||
2314 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
2315 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
2316 | rtm_mpls_policy, extack); | |
d77851bf JK |
2317 | |
2318 | rtm = nlmsg_data(nlh); | |
2319 | if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || | |
2320 | rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || | |
2321 | rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { | |
2322 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
2323 | return -EINVAL; | |
2324 | } | |
2325 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
2326 | NL_SET_ERR_MSG_MOD(extack, | |
2327 | "Invalid flags for get route request"); | |
2328 | return -EINVAL; | |
2329 | } | |
2330 | ||
8cb08174 JB |
2331 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
2332 | rtm_mpls_policy, extack); | |
d77851bf JK |
2333 | if (err) |
2334 | return err; | |
2335 | ||
2336 | if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { | |
2337 | NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); | |
2338 | return -EINVAL; | |
2339 | } | |
2340 | ||
2341 | for (i = 0; i <= RTA_MAX; i++) { | |
2342 | if (!tb[i]) | |
2343 | continue; | |
2344 | ||
2345 | switch (i) { | |
2346 | case RTA_DST: | |
2347 | case RTA_NEWDST: | |
2348 | break; | |
2349 | default: | |
2350 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
2351 | return -EINVAL; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | return 0; | |
2356 | } | |
2357 | ||
397fc9e5 RP |
2358 | static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
2359 | struct netlink_ext_ack *extack) | |
2360 | { | |
2361 | struct net *net = sock_net(in_skb->sk); | |
2362 | u32 portid = NETLINK_CB(in_skb).portid; | |
a906c1aa | 2363 | u32 in_label = LABEL_NOT_SPECIFIED; |
397fc9e5 RP |
2364 | struct nlattr *tb[RTA_MAX + 1]; |
2365 | u32 labels[MAX_NEW_LABELS]; | |
2366 | struct mpls_shim_hdr *hdr; | |
2367 | unsigned int hdr_size = 0; | |
f05b0b97 | 2368 | const struct mpls_nh *nh; |
397fc9e5 RP |
2369 | struct net_device *dev; |
2370 | struct mpls_route *rt; | |
2371 | struct rtmsg *rtm, *r; | |
2372 | struct nlmsghdr *nlh; | |
2373 | struct sk_buff *skb; | |
397fc9e5 | 2374 | u8 n_labels; |
a906c1aa | 2375 | int err; |
397fc9e5 | 2376 | |
d77851bf | 2377 | err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); |
397fc9e5 RP |
2378 | if (err < 0) |
2379 | goto errout; | |
2380 | ||
2381 | rtm = nlmsg_data(in_nlh); | |
2382 | ||
2383 | if (tb[RTA_DST]) { | |
2384 | u8 label_count; | |
2385 | ||
2386 | if (nla_get_labels(tb[RTA_DST], 1, &label_count, | |
a906c1aa RP |
2387 | &in_label, extack)) { |
2388 | err = -EINVAL; | |
397fc9e5 | 2389 | goto errout; |
a906c1aa | 2390 | } |
397fc9e5 | 2391 | |
3968523f | 2392 | if (!mpls_label_ok(net, &in_label, extack)) { |
a906c1aa | 2393 | err = -EINVAL; |
397fc9e5 | 2394 | goto errout; |
a906c1aa | 2395 | } |
397fc9e5 RP |
2396 | } |
2397 | ||
2398 | rt = mpls_route_input_rcu(net, in_label); | |
2399 | if (!rt) { | |
2400 | err = -ENETUNREACH; | |
2401 | goto errout; | |
2402 | } | |
2403 | ||
2404 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { | |
2405 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
2406 | if (!skb) { | |
2407 | err = -ENOBUFS; | |
2408 | goto errout; | |
2409 | } | |
2410 | ||
2411 | err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, | |
2412 | RTM_NEWROUTE, in_label, rt, 0); | |
2413 | if (err < 0) { | |
2414 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
2415 | WARN_ON(err == -EMSGSIZE); | |
2416 | goto errout_free; | |
2417 | } | |
2418 | ||
2419 | return rtnl_unicast(skb, net, portid); | |
2420 | } | |
2421 | ||
2422 | if (tb[RTA_NEWDST]) { | |
2423 | if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, | |
2424 | labels, extack) != 0) { | |
2425 | err = -EINVAL; | |
2426 | goto errout; | |
2427 | } | |
2428 | ||
2429 | hdr_size = n_labels * sizeof(struct mpls_shim_hdr); | |
2430 | } | |
2431 | ||
2432 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2433 | if (!skb) { | |
2434 | err = -ENOBUFS; | |
2435 | goto errout; | |
2436 | } | |
2437 | ||
2438 | skb->protocol = htons(ETH_P_MPLS_UC); | |
2439 | ||
2440 | if (hdr_size) { | |
2441 | bool bos; | |
2442 | int i; | |
2443 | ||
2444 | if (skb_cow(skb, hdr_size)) { | |
2445 | err = -ENOBUFS; | |
2446 | goto errout_free; | |
2447 | } | |
2448 | ||
2449 | skb_reserve(skb, hdr_size); | |
2450 | skb_push(skb, hdr_size); | |
2451 | skb_reset_network_header(skb); | |
2452 | ||
2453 | /* Push new labels */ | |
2454 | hdr = mpls_hdr(skb); | |
2455 | bos = true; | |
2456 | for (i = n_labels - 1; i >= 0; i--) { | |
2457 | hdr[i] = mpls_entry_encode(labels[i], | |
2458 | 1, 0, bos); | |
2459 | bos = false; | |
2460 | } | |
2461 | } | |
2462 | ||
2463 | nh = mpls_select_multipath(rt, skb); | |
2464 | if (!nh) { | |
2465 | err = -ENETUNREACH; | |
2466 | goto errout_free; | |
2467 | } | |
2468 | ||
2469 | if (hdr_size) { | |
2470 | skb_pull(skb, hdr_size); | |
2471 | skb_reset_network_header(skb); | |
2472 | } | |
2473 | ||
2474 | nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, | |
2475 | RTM_NEWROUTE, sizeof(*r), 0); | |
2476 | if (!nlh) { | |
2477 | err = -EMSGSIZE; | |
2478 | goto errout_free; | |
2479 | } | |
2480 | ||
2481 | r = nlmsg_data(nlh); | |
2482 | r->rtm_family = AF_MPLS; | |
2483 | r->rtm_dst_len = 20; | |
2484 | r->rtm_src_len = 0; | |
2485 | r->rtm_table = RT_TABLE_MAIN; | |
2486 | r->rtm_type = RTN_UNICAST; | |
2487 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2488 | r->rtm_protocol = rt->rt_protocol; | |
2489 | r->rtm_flags = 0; | |
2490 | ||
2491 | if (nla_put_labels(skb, RTA_DST, 1, &in_label)) | |
2492 | goto nla_put_failure; | |
2493 | ||
2494 | if (nh->nh_labels && | |
2495 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
2496 | nh->nh_label)) | |
2497 | goto nla_put_failure; | |
2498 | ||
2499 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && | |
2500 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), | |
2501 | nh->nh_via_alen)) | |
2502 | goto nla_put_failure; | |
18916818 | 2503 | dev = nh->nh_dev; |
397fc9e5 RP |
2504 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) |
2505 | goto nla_put_failure; | |
2506 | ||
2507 | nlmsg_end(skb, nlh); | |
2508 | ||
2509 | err = rtnl_unicast(skb, net, portid); | |
2510 | errout: | |
2511 | return err; | |
2512 | ||
2513 | nla_put_failure: | |
2514 | nlmsg_cancel(skb, nlh); | |
2515 | err = -EMSGSIZE; | |
2516 | errout_free: | |
2517 | kfree_skb(skb); | |
2518 | return err; | |
2519 | } | |
2520 | ||
7720c01f EB |
2521 | static int resize_platform_label_table(struct net *net, size_t limit) |
2522 | { | |
2523 | size_t size = sizeof(struct mpls_route *) * limit; | |
2524 | size_t old_limit; | |
2525 | size_t cp_size; | |
2526 | struct mpls_route __rcu **labels = NULL, **old; | |
2527 | struct mpls_route *rt0 = NULL, *rt2 = NULL; | |
2528 | unsigned index; | |
2529 | ||
2530 | if (size) { | |
752ade68 | 2531 | labels = kvzalloc(size, GFP_KERNEL); |
7720c01f EB |
2532 | if (!labels) |
2533 | goto nolabels; | |
2534 | } | |
2535 | ||
2536 | /* In case the predefined labels need to be populated */ | |
78f5b899 | 2537 | if (limit > MPLS_LABEL_IPV4NULL) { |
7720c01f | 2538 | struct net_device *lo = net->loopback_dev; |
a4ac8c98 | 2539 | rt0 = mpls_rt_alloc(1, lo->addr_len, 0); |
df1c6316 | 2540 | if (IS_ERR(rt0)) |
7720c01f | 2541 | goto nort0; |
18916818 | 2542 | rt0->rt_nh->nh_dev = lo; |
7720c01f | 2543 | rt0->rt_protocol = RTPROT_KERNEL; |
118d5234 | 2544 | rt0->rt_payload_type = MPT_IPV4; |
5b441ac8 | 2545 | rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
f8efb73c | 2546 | rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 2547 | rt0->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
2548 | memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, |
2549 | lo->addr_len); | |
7720c01f | 2550 | } |
78f5b899 | 2551 | if (limit > MPLS_LABEL_IPV6NULL) { |
7720c01f | 2552 | struct net_device *lo = net->loopback_dev; |
a4ac8c98 | 2553 | rt2 = mpls_rt_alloc(1, lo->addr_len, 0); |
df1c6316 | 2554 | if (IS_ERR(rt2)) |
7720c01f | 2555 | goto nort2; |
18916818 | 2556 | rt2->rt_nh->nh_dev = lo; |
7720c01f | 2557 | rt2->rt_protocol = RTPROT_KERNEL; |
118d5234 | 2558 | rt2->rt_payload_type = MPT_IPV6; |
6a18c312 | 2559 | rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
f8efb73c | 2560 | rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 2561 | rt2->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
2562 | memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, |
2563 | lo->addr_len); | |
7720c01f EB |
2564 | } |
2565 | ||
2566 | rtnl_lock(); | |
2567 | /* Remember the original table */ | |
19d0c341 | 2568 | old = rtnl_dereference(net->mpls.platform_label); |
7720c01f EB |
2569 | old_limit = net->mpls.platform_labels; |
2570 | ||
2571 | /* Free any labels beyond the new table */ | |
2572 | for (index = limit; index < old_limit; index++) | |
f8efb73c | 2573 | mpls_route_update(net, index, NULL, NULL); |
7720c01f EB |
2574 | |
2575 | /* Copy over the old labels */ | |
2576 | cp_size = size; | |
2577 | if (old_limit < limit) | |
2578 | cp_size = old_limit * sizeof(struct mpls_route *); | |
2579 | ||
2580 | memcpy(labels, old, cp_size); | |
2581 | ||
2582 | /* If needed set the predefined labels */ | |
78f5b899 TH |
2583 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
2584 | (limit > MPLS_LABEL_IPV6NULL)) { | |
2585 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); | |
7720c01f EB |
2586 | rt2 = NULL; |
2587 | } | |
2588 | ||
78f5b899 TH |
2589 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
2590 | (limit > MPLS_LABEL_IPV4NULL)) { | |
2591 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); | |
7720c01f EB |
2592 | rt0 = NULL; |
2593 | } | |
2594 | ||
2595 | /* Update the global pointers */ | |
2596 | net->mpls.platform_labels = limit; | |
19d0c341 | 2597 | rcu_assign_pointer(net->mpls.platform_label, labels); |
7720c01f EB |
2598 | |
2599 | rtnl_unlock(); | |
2600 | ||
2601 | mpls_rt_free(rt2); | |
2602 | mpls_rt_free(rt0); | |
2603 | ||
2604 | if (old) { | |
2605 | synchronize_rcu(); | |
2606 | kvfree(old); | |
2607 | } | |
2608 | return 0; | |
2609 | ||
2610 | nort2: | |
2611 | mpls_rt_free(rt0); | |
2612 | nort0: | |
2613 | kvfree(labels); | |
2614 | nolabels: | |
2615 | return -ENOMEM; | |
2616 | } | |
2617 | ||
2618 | static int mpls_platform_labels(struct ctl_table *table, int write, | |
32927393 | 2619 | void *buffer, size_t *lenp, loff_t *ppos) |
7720c01f EB |
2620 | { |
2621 | struct net *net = table->data; | |
2622 | int platform_labels = net->mpls.platform_labels; | |
2623 | int ret; | |
2624 | struct ctl_table tmp = { | |
2625 | .procname = table->procname, | |
2626 | .data = &platform_labels, | |
2627 | .maxlen = sizeof(int), | |
2628 | .mode = table->mode, | |
eec4844f | 2629 | .extra1 = SYSCTL_ZERO, |
7720c01f EB |
2630 | .extra2 = &label_limit, |
2631 | }; | |
2632 | ||
2633 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2634 | ||
2635 | if (write && ret == 0) | |
2636 | ret = resize_platform_label_table(net, platform_labels); | |
2637 | ||
2638 | return ret; | |
2639 | } | |
2640 | ||
5b441ac8 RS |
2641 | #define MPLS_NS_SYSCTL_OFFSET(field) \ |
2642 | (&((struct net *)0)->field) | |
2643 | ||
37bde799 | 2644 | static const struct ctl_table mpls_table[] = { |
7720c01f EB |
2645 | { |
2646 | .procname = "platform_labels", | |
2647 | .data = NULL, | |
2648 | .maxlen = sizeof(int), | |
2649 | .mode = 0644, | |
2650 | .proc_handler = mpls_platform_labels, | |
2651 | }, | |
5b441ac8 RS |
2652 | { |
2653 | .procname = "ip_ttl_propagate", | |
2654 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), | |
2655 | .maxlen = sizeof(int), | |
2656 | .mode = 0644, | |
2657 | .proc_handler = proc_dointvec_minmax, | |
eec4844f MC |
2658 | .extra1 = SYSCTL_ZERO, |
2659 | .extra2 = SYSCTL_ONE, | |
5b441ac8 | 2660 | }, |
a59166e4 RS |
2661 | { |
2662 | .procname = "default_ttl", | |
2663 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), | |
2664 | .maxlen = sizeof(int), | |
2665 | .mode = 0644, | |
2666 | .proc_handler = proc_dointvec_minmax, | |
eec4844f | 2667 | .extra1 = SYSCTL_ONE, |
a59166e4 RS |
2668 | .extra2 = &ttl_max, |
2669 | }, | |
7720c01f EB |
2670 | { } |
2671 | }; | |
2672 | ||
0189197f EB |
2673 | static int mpls_net_init(struct net *net) |
2674 | { | |
7720c01f | 2675 | struct ctl_table *table; |
5b441ac8 | 2676 | int i; |
7720c01f | 2677 | |
0189197f EB |
2678 | net->mpls.platform_labels = 0; |
2679 | net->mpls.platform_label = NULL; | |
5b441ac8 | 2680 | net->mpls.ip_ttl_propagate = 1; |
a59166e4 | 2681 | net->mpls.default_ttl = 255; |
0189197f | 2682 | |
7720c01f EB |
2683 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
2684 | if (table == NULL) | |
2685 | return -ENOMEM; | |
2686 | ||
5b441ac8 RS |
2687 | /* Table data contains only offsets relative to the base of |
2688 | * the mdev at this point, so make them absolute. | |
2689 | */ | |
2690 | for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) | |
2691 | table[i].data = (char *)net + (uintptr_t)table[i].data; | |
2692 | ||
c899710f JG |
2693 | net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, |
2694 | ARRAY_SIZE(mpls_table)); | |
6ea3c9d5 NA |
2695 | if (net->mpls.ctl == NULL) { |
2696 | kfree(table); | |
7720c01f | 2697 | return -ENOMEM; |
6ea3c9d5 | 2698 | } |
7720c01f | 2699 | |
0189197f EB |
2700 | return 0; |
2701 | } | |
2702 | ||
2703 | static void mpls_net_exit(struct net *net) | |
2704 | { | |
19d0c341 EB |
2705 | struct mpls_route __rcu **platform_label; |
2706 | size_t platform_labels; | |
7720c01f | 2707 | struct ctl_table *table; |
0189197f EB |
2708 | unsigned int index; |
2709 | ||
7720c01f EB |
2710 | table = net->mpls.ctl->ctl_table_arg; |
2711 | unregister_net_sysctl_table(net->mpls.ctl); | |
2712 | kfree(table); | |
2713 | ||
19d0c341 EB |
2714 | /* An rcu grace period has passed since there was a device in |
2715 | * the network namespace (and thus the last in flight packet) | |
0189197f EB |
2716 | * left this network namespace. This is because |
2717 | * unregister_netdevice_many and netdev_run_todo has completed | |
2718 | * for each network device that was in this network namespace. | |
2719 | * | |
2720 | * As such no additional rcu synchronization is necessary when | |
2721 | * freeing the platform_label table. | |
2722 | */ | |
2723 | rtnl_lock(); | |
19d0c341 EB |
2724 | platform_label = rtnl_dereference(net->mpls.platform_label); |
2725 | platform_labels = net->mpls.platform_labels; | |
2726 | for (index = 0; index < platform_labels; index++) { | |
2727 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
2728 | RCU_INIT_POINTER(platform_label[index], NULL); | |
e37791ec | 2729 | mpls_notify_route(net, index, rt, NULL, NULL); |
0189197f EB |
2730 | mpls_rt_free(rt); |
2731 | } | |
2732 | rtnl_unlock(); | |
2733 | ||
19d0c341 | 2734 | kvfree(platform_label); |
0189197f EB |
2735 | } |
2736 | ||
2737 | static struct pernet_operations mpls_net_ops = { | |
2738 | .init = mpls_net_init, | |
2739 | .exit = mpls_net_exit, | |
2740 | }; | |
2741 | ||
27d69105 RS |
2742 | static struct rtnl_af_ops mpls_af_ops __read_mostly = { |
2743 | .family = AF_MPLS, | |
2744 | .fill_stats_af = mpls_fill_stats_af, | |
2745 | .get_stats_af_size = mpls_get_stats_af_size, | |
2746 | }; | |
2747 | ||
0189197f EB |
2748 | static int __init mpls_init(void) |
2749 | { | |
2750 | int err; | |
2751 | ||
2752 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); | |
2753 | ||
2754 | err = register_pernet_subsys(&mpls_net_ops); | |
2755 | if (err) | |
2756 | goto out; | |
2757 | ||
2758 | err = register_netdevice_notifier(&mpls_dev_notifier); | |
2759 | if (err) | |
2760 | goto out_unregister_pernet; | |
2761 | ||
2762 | dev_add_pack(&mpls_packet_type); | |
2763 | ||
27d69105 RS |
2764 | rtnl_af_register(&mpls_af_ops); |
2765 | ||
c1c502b5 FW |
2766 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, |
2767 | mpls_rtm_newroute, NULL, 0); | |
2768 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, | |
2769 | mpls_rtm_delroute, NULL, 0); | |
2770 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, | |
2771 | mpls_getroute, mpls_dump_routes, 0); | |
2772 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, | |
2773 | mpls_netconf_get_devconf, | |
2774 | mpls_netconf_dump_devconf, 0); | |
bdc47641 AK |
2775 | err = ipgre_tunnel_encap_add_mpls_ops(); |
2776 | if (err) | |
2777 | pr_err("Can't add mpls over gre tunnel ops\n"); | |
2778 | ||
0189197f EB |
2779 | err = 0; |
2780 | out: | |
2781 | return err; | |
2782 | ||
2783 | out_unregister_pernet: | |
2784 | unregister_pernet_subsys(&mpls_net_ops); | |
2785 | goto out; | |
2786 | } | |
2787 | module_init(mpls_init); | |
2788 | ||
2789 | static void __exit mpls_exit(void) | |
2790 | { | |
03c05665 | 2791 | rtnl_unregister_all(PF_MPLS); |
27d69105 | 2792 | rtnl_af_unregister(&mpls_af_ops); |
0189197f EB |
2793 | dev_remove_pack(&mpls_packet_type); |
2794 | unregister_netdevice_notifier(&mpls_dev_notifier); | |
2795 | unregister_pernet_subsys(&mpls_net_ops); | |
bdc47641 | 2796 | ipgre_tunnel_encap_del_mpls_ops(); |
0189197f EB |
2797 | } |
2798 | module_exit(mpls_exit); | |
2799 | ||
2800 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); | |
2801 | MODULE_LICENSE("GPL v2"); | |
2802 | MODULE_ALIAS_NETPROTO(PF_MPLS); |