Commit | Line | Data |
---|---|---|
0189197f EB |
1 | #include <linux/types.h> |
2 | #include <linux/skbuff.h> | |
3 | #include <linux/socket.h> | |
7720c01f | 4 | #include <linux/sysctl.h> |
0189197f EB |
5 | #include <linux/net.h> |
6 | #include <linux/module.h> | |
7 | #include <linux/if_arp.h> | |
8 | #include <linux/ipv6.h> | |
9 | #include <linux/mpls.h> | |
24045a03 | 10 | #include <linux/netconf.h> |
4b5edb2f | 11 | #include <linux/vmalloc.h> |
27d69105 | 12 | #include <linux/percpu.h> |
0189197f EB |
13 | #include <net/ip.h> |
14 | #include <net/dst.h> | |
15 | #include <net/sock.h> | |
16 | #include <net/arp.h> | |
17 | #include <net/ip_fib.h> | |
18 | #include <net/netevent.h> | |
bdc47641 | 19 | #include <net/ip_tunnels.h> |
0189197f | 20 | #include <net/netns/generic.h> |
bf21563a RP |
21 | #if IS_ENABLED(CONFIG_IPV6) |
22 | #include <net/ipv6.h> | |
bf21563a | 23 | #endif |
27d69105 | 24 | #include <net/addrconf.h> |
f8efb73c | 25 | #include <net/nexthop.h> |
0189197f EB |
26 | #include "internal.h" |
27 | ||
df1c6316 DA |
28 | /* max memory we will use for mpls_route */ |
29 | #define MAX_MPLS_ROUTE_MEM 4096 | |
30 | ||
1c78efa8 RS |
31 | /* Maximum number of labels to look ahead at when selecting a path of |
32 | * a multipath route | |
33 | */ | |
34 | #define MAX_MP_SELECT_LABELS 4 | |
35 | ||
eb7809f0 RS |
36 | #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) |
37 | ||
7720c01f | 38 | static int zero = 0; |
5b441ac8 | 39 | static int one = 1; |
7720c01f | 40 | static int label_limit = (1 << 20) - 1; |
a59166e4 | 41 | static int ttl_max = 255; |
7720c01f | 42 | |
bdc47641 | 43 | #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) |
14c68c43 | 44 | static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) |
bdc47641 AK |
45 | { |
46 | return sizeof(struct mpls_shim_hdr); | |
47 | } | |
48 | ||
49 | static const struct ip_tunnel_encap_ops mpls_iptun_ops = { | |
50 | .encap_hlen = ipgre_mpls_encap_hlen, | |
51 | }; | |
52 | ||
53 | static int ipgre_tunnel_encap_add_mpls_ops(void) | |
54 | { | |
55 | return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); | |
56 | } | |
57 | ||
58 | static void ipgre_tunnel_encap_del_mpls_ops(void) | |
59 | { | |
60 | ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); | |
61 | } | |
62 | #else | |
63 | static int ipgre_tunnel_encap_add_mpls_ops(void) | |
64 | { | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static void ipgre_tunnel_encap_del_mpls_ops(void) | |
69 | { | |
70 | } | |
71 | #endif | |
72 | ||
8de147dc EB |
73 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, |
74 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
75 | unsigned int nlm_flags); | |
76 | ||
0189197f EB |
77 | static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) |
78 | { | |
79 | struct mpls_route *rt = NULL; | |
80 | ||
81 | if (index < net->mpls.platform_labels) { | |
82 | struct mpls_route __rcu **platform_label = | |
83 | rcu_dereference(net->mpls.platform_label); | |
84 | rt = rcu_dereference(platform_label[index]); | |
85 | } | |
86 | return rt; | |
87 | } | |
88 | ||
face0188 | 89 | bool mpls_output_possible(const struct net_device *dev) |
0189197f EB |
90 | { |
91 | return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); | |
92 | } | |
face0188 | 93 | EXPORT_SYMBOL_GPL(mpls_output_possible); |
0189197f | 94 | |
cf4b24f0 RS |
95 | static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) |
96 | { | |
59b20966 | 97 | return (u8 *)nh + rt->rt_via_offset; |
cf4b24f0 RS |
98 | } |
99 | ||
100 | static const u8 *mpls_nh_via(const struct mpls_route *rt, | |
101 | const struct mpls_nh *nh) | |
102 | { | |
103 | return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); | |
104 | } | |
105 | ||
f8efb73c | 106 | static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) |
0189197f EB |
107 | { |
108 | /* The size of the layer 2.5 labels to be added for this route */ | |
f8efb73c | 109 | return nh->nh_labels * sizeof(struct mpls_shim_hdr); |
0189197f EB |
110 | } |
111 | ||
face0188 | 112 | unsigned int mpls_dev_mtu(const struct net_device *dev) |
0189197f EB |
113 | { |
114 | /* The amount of data the layer 2 frame can hold */ | |
115 | return dev->mtu; | |
116 | } | |
face0188 | 117 | EXPORT_SYMBOL_GPL(mpls_dev_mtu); |
0189197f | 118 | |
face0188 | 119 | bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
0189197f EB |
120 | { |
121 | if (skb->len <= mtu) | |
122 | return false; | |
123 | ||
ae7ef81e | 124 | if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu)) |
0189197f EB |
125 | return false; |
126 | ||
127 | return true; | |
128 | } | |
face0188 | 129 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
0189197f | 130 | |
27d69105 RS |
131 | void mpls_stats_inc_outucastpkts(struct net_device *dev, |
132 | const struct sk_buff *skb) | |
133 | { | |
134 | struct mpls_dev *mdev; | |
135 | ||
136 | if (skb->protocol == htons(ETH_P_MPLS_UC)) { | |
137 | mdev = mpls_dev_get(dev); | |
138 | if (mdev) | |
139 | MPLS_INC_STATS_LEN(mdev, skb->len, | |
140 | tx_packets, | |
141 | tx_bytes); | |
142 | } else if (skb->protocol == htons(ETH_P_IP)) { | |
143 | IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); | |
144 | #if IS_ENABLED(CONFIG_IPV6) | |
145 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
146 | struct inet6_dev *in6dev = __in6_dev_get(dev); | |
147 | ||
148 | if (in6dev) | |
149 | IP6_UPD_PO_STATS(dev_net(dev), in6dev, | |
150 | IPSTATS_MIB_OUT, skb->len); | |
151 | #endif | |
152 | } | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); | |
155 | ||
9f427a0e | 156 | static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) |
f8efb73c | 157 | { |
1c78efa8 | 158 | struct mpls_entry_decoded dec; |
9f427a0e | 159 | unsigned int mpls_hdr_len = 0; |
1c78efa8 RS |
160 | struct mpls_shim_hdr *hdr; |
161 | bool eli_seen = false; | |
162 | int label_index; | |
1c78efa8 RS |
163 | u32 hash = 0; |
164 | ||
9f427a0e | 165 | for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; |
1c78efa8 | 166 | label_index++) { |
9f427a0e DA |
167 | mpls_hdr_len += sizeof(*hdr); |
168 | if (!pskb_may_pull(skb, mpls_hdr_len)) | |
1c78efa8 RS |
169 | break; |
170 | ||
171 | /* Read and decode the current label */ | |
172 | hdr = mpls_hdr(skb) + label_index; | |
173 | dec = mpls_entry_decode(hdr); | |
174 | ||
175 | /* RFC6790 - reserved labels MUST NOT be used as keys | |
176 | * for the load-balancing function | |
177 | */ | |
178 | if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { | |
179 | hash = jhash_1word(dec.label, hash); | |
180 | ||
181 | /* The entropy label follows the entropy label | |
182 | * indicator, so this means that the entropy | |
183 | * label was just added to the hash - no need to | |
184 | * go any deeper either in the label stack or in the | |
185 | * payload | |
186 | */ | |
187 | if (eli_seen) | |
188 | break; | |
189 | } else if (dec.label == MPLS_LABEL_ENTROPY) { | |
190 | eli_seen = true; | |
191 | } | |
192 | ||
9f427a0e DA |
193 | if (!dec.bos) |
194 | continue; | |
195 | ||
196 | /* found bottom label; does skb have room for a header? */ | |
197 | if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { | |
1c78efa8 RS |
198 | const struct iphdr *v4hdr; |
199 | ||
9f427a0e | 200 | v4hdr = (const struct iphdr *)(hdr + 1); |
1c78efa8 RS |
201 | if (v4hdr->version == 4) { |
202 | hash = jhash_3words(ntohl(v4hdr->saddr), | |
203 | ntohl(v4hdr->daddr), | |
204 | v4hdr->protocol, hash); | |
205 | } else if (v4hdr->version == 6 && | |
9f427a0e DA |
206 | pskb_may_pull(skb, mpls_hdr_len + |
207 | sizeof(struct ipv6hdr))) { | |
1c78efa8 RS |
208 | const struct ipv6hdr *v6hdr; |
209 | ||
9f427a0e | 210 | v6hdr = (const struct ipv6hdr *)(hdr + 1); |
1c78efa8 RS |
211 | hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); |
212 | hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); | |
213 | hash = jhash_1word(v6hdr->nexthdr, hash); | |
214 | } | |
215 | } | |
9f427a0e DA |
216 | |
217 | break; | |
1c78efa8 RS |
218 | } |
219 | ||
c89359a4 RP |
220 | return hash; |
221 | } | |
222 | ||
59b20966 DA |
223 | static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) |
224 | { | |
225 | return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); | |
226 | } | |
227 | ||
39eb8cd1 DA |
228 | /* number of alive nexthops (rt->rt_nhn_alive) and the flags for |
229 | * a next hop (nh->nh_flags) are modified by netdev event handlers. | |
230 | * Since those fields can change at any moment, use READ_ONCE to | |
231 | * access both. | |
232 | */ | |
c89359a4 | 233 | static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, |
9f427a0e | 234 | struct sk_buff *skb) |
c89359a4 | 235 | { |
c89359a4 RP |
236 | u32 hash = 0; |
237 | int nh_index = 0; | |
238 | int n = 0; | |
77ef013a | 239 | u8 alive; |
c89359a4 RP |
240 | |
241 | /* No need to look further into packet if there's only | |
242 | * one path | |
243 | */ | |
244 | if (rt->rt_nhn == 1) | |
59b20966 | 245 | return rt->rt_nh; |
c89359a4 | 246 | |
39eb8cd1 DA |
247 | alive = READ_ONCE(rt->rt_nhn_alive); |
248 | if (alive == 0) | |
c89359a4 RP |
249 | return NULL; |
250 | ||
9f427a0e | 251 | hash = mpls_multipath_hash(rt, skb); |
c89359a4 RP |
252 | nh_index = hash % alive; |
253 | if (alive == rt->rt_nhn) | |
254 | goto out; | |
255 | for_nexthops(rt) { | |
39eb8cd1 DA |
256 | unsigned int nh_flags = READ_ONCE(nh->nh_flags); |
257 | ||
258 | if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) | |
c89359a4 RP |
259 | continue; |
260 | if (n == nh_index) | |
261 | return nh; | |
262 | n++; | |
263 | } endfor_nexthops(rt); | |
264 | ||
1c78efa8 | 265 | out: |
59b20966 | 266 | return mpls_get_nexthop(rt, nh_index); |
f8efb73c RP |
267 | } |
268 | ||
5b441ac8 RS |
269 | static bool mpls_egress(struct net *net, struct mpls_route *rt, |
270 | struct sk_buff *skb, struct mpls_entry_decoded dec) | |
0189197f | 271 | { |
118d5234 RS |
272 | enum mpls_payload_type payload_type; |
273 | bool success = false; | |
0189197f | 274 | |
76fecd82 EB |
275 | /* The IPv4 code below accesses through the IPv4 header |
276 | * checksum, which is 12 bytes into the packet. | |
277 | * The IPv6 code below accesses through the IPv6 hop limit | |
278 | * which is 8 bytes into the packet. | |
279 | * | |
280 | * For all supported cases there should always be at least 12 | |
281 | * bytes of packet data present. The IPv4 header is 20 bytes | |
282 | * without options and the IPv6 header is always 40 bytes | |
283 | * long. | |
284 | */ | |
285 | if (!pskb_may_pull(skb, 12)) | |
286 | return false; | |
287 | ||
118d5234 RS |
288 | payload_type = rt->rt_payload_type; |
289 | if (payload_type == MPT_UNSPEC) | |
290 | payload_type = ip_hdr(skb)->version; | |
291 | ||
292 | switch (payload_type) { | |
293 | case MPT_IPV4: { | |
294 | struct iphdr *hdr4 = ip_hdr(skb); | |
5b441ac8 | 295 | u8 new_ttl; |
0189197f | 296 | skb->protocol = htons(ETH_P_IP); |
5b441ac8 RS |
297 | |
298 | /* If propagating TTL, take the decremented TTL from | |
299 | * the incoming MPLS header, otherwise decrement the | |
300 | * TTL, but only if not 0 to avoid underflow. | |
301 | */ | |
302 | if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || | |
303 | (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && | |
304 | net->mpls.ip_ttl_propagate)) | |
305 | new_ttl = dec.ttl; | |
306 | else | |
307 | new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; | |
308 | ||
0189197f EB |
309 | csum_replace2(&hdr4->check, |
310 | htons(hdr4->ttl << 8), | |
5b441ac8 RS |
311 | htons(new_ttl << 8)); |
312 | hdr4->ttl = new_ttl; | |
118d5234 RS |
313 | success = true; |
314 | break; | |
0189197f | 315 | } |
118d5234 | 316 | case MPT_IPV6: { |
0189197f EB |
317 | struct ipv6hdr *hdr6 = ipv6_hdr(skb); |
318 | skb->protocol = htons(ETH_P_IPV6); | |
5b441ac8 RS |
319 | |
320 | /* If propagating TTL, take the decremented TTL from | |
321 | * the incoming MPLS header, otherwise decrement the | |
322 | * hop limit, but only if not 0 to avoid underflow. | |
323 | */ | |
324 | if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || | |
325 | (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && | |
326 | net->mpls.ip_ttl_propagate)) | |
327 | hdr6->hop_limit = dec.ttl; | |
328 | else if (hdr6->hop_limit) | |
329 | hdr6->hop_limit = hdr6->hop_limit - 1; | |
118d5234 RS |
330 | success = true; |
331 | break; | |
0189197f | 332 | } |
118d5234 | 333 | case MPT_UNSPEC: |
5b441ac8 | 334 | /* Should have decided which protocol it is by now */ |
118d5234 RS |
335 | break; |
336 | } | |
337 | ||
0189197f EB |
338 | return success; |
339 | } | |
340 | ||
341 | static int mpls_forward(struct sk_buff *skb, struct net_device *dev, | |
342 | struct packet_type *pt, struct net_device *orig_dev) | |
343 | { | |
344 | struct net *net = dev_net(dev); | |
345 | struct mpls_shim_hdr *hdr; | |
346 | struct mpls_route *rt; | |
f8efb73c | 347 | struct mpls_nh *nh; |
0189197f EB |
348 | struct mpls_entry_decoded dec; |
349 | struct net_device *out_dev; | |
27d69105 | 350 | struct mpls_dev *out_mdev; |
03c57747 | 351 | struct mpls_dev *mdev; |
0189197f EB |
352 | unsigned int hh_len; |
353 | unsigned int new_header_size; | |
354 | unsigned int mtu; | |
355 | int err; | |
356 | ||
357 | /* Careful this entire function runs inside of an rcu critical section */ | |
358 | ||
03c57747 | 359 | mdev = mpls_dev_get(dev); |
27d69105 | 360 | if (!mdev) |
03c57747 RS |
361 | goto drop; |
362 | ||
27d69105 RS |
363 | MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, |
364 | rx_bytes); | |
365 | ||
366 | if (!mdev->input_enabled) { | |
367 | MPLS_INC_STATS(mdev, rx_dropped); | |
0189197f | 368 | goto drop; |
27d69105 RS |
369 | } |
370 | ||
371 | if (skb->pkt_type != PACKET_HOST) | |
372 | goto err; | |
0189197f EB |
373 | |
374 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
27d69105 | 375 | goto err; |
0189197f EB |
376 | |
377 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
27d69105 | 378 | goto err; |
0189197f EB |
379 | |
380 | /* Read and decode the label */ | |
381 | hdr = mpls_hdr(skb); | |
382 | dec = mpls_entry_decode(hdr); | |
383 | ||
0189197f | 384 | rt = mpls_route_input_rcu(net, dec.label); |
27d69105 RS |
385 | if (!rt) { |
386 | MPLS_INC_STATS(mdev, rx_noroute); | |
0189197f | 387 | goto drop; |
27d69105 | 388 | } |
0189197f | 389 | |
9f427a0e | 390 | nh = mpls_select_multipath(rt, skb); |
f8efb73c | 391 | if (!nh) |
27d69105 | 392 | goto err; |
0189197f | 393 | |
9f427a0e DA |
394 | /* Pop the label */ |
395 | skb_pull(skb, sizeof(*hdr)); | |
396 | skb_reset_network_header(skb); | |
397 | ||
398 | skb_orphan(skb); | |
399 | ||
0189197f | 400 | if (skb_warn_if_lro(skb)) |
27d69105 | 401 | goto err; |
0189197f EB |
402 | |
403 | skb_forward_csum(skb); | |
404 | ||
405 | /* Verify ttl is valid */ | |
aa7da937 | 406 | if (dec.ttl <= 1) |
27d69105 | 407 | goto err; |
0189197f EB |
408 | dec.ttl -= 1; |
409 | ||
27d69105 RS |
410 | /* Find the output device */ |
411 | out_dev = rcu_dereference(nh->nh_dev); | |
412 | if (!mpls_output_possible(out_dev)) | |
413 | goto tx_err; | |
414 | ||
0189197f | 415 | /* Verify the destination can hold the packet */ |
f8efb73c | 416 | new_header_size = mpls_nh_header_size(nh); |
0189197f EB |
417 | mtu = mpls_dev_mtu(out_dev); |
418 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) | |
27d69105 | 419 | goto tx_err; |
0189197f EB |
420 | |
421 | hh_len = LL_RESERVED_SPACE(out_dev); | |
422 | if (!out_dev->header_ops) | |
423 | hh_len = 0; | |
424 | ||
425 | /* Ensure there is enough space for the headers in the skb */ | |
426 | if (skb_cow(skb, hh_len + new_header_size)) | |
27d69105 | 427 | goto tx_err; |
0189197f EB |
428 | |
429 | skb->dev = out_dev; | |
430 | skb->protocol = htons(ETH_P_MPLS_UC); | |
431 | ||
432 | if (unlikely(!new_header_size && dec.bos)) { | |
433 | /* Penultimate hop popping */ | |
5b441ac8 | 434 | if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) |
27d69105 | 435 | goto err; |
0189197f EB |
436 | } else { |
437 | bool bos; | |
438 | int i; | |
439 | skb_push(skb, new_header_size); | |
440 | skb_reset_network_header(skb); | |
441 | /* Push the new labels */ | |
442 | hdr = mpls_hdr(skb); | |
443 | bos = dec.bos; | |
f8efb73c RP |
444 | for (i = nh->nh_labels - 1; i >= 0; i--) { |
445 | hdr[i] = mpls_entry_encode(nh->nh_label[i], | |
446 | dec.ttl, 0, bos); | |
0189197f EB |
447 | bos = false; |
448 | } | |
449 | } | |
450 | ||
27d69105 RS |
451 | mpls_stats_inc_outucastpkts(out_dev, skb); |
452 | ||
eb7809f0 RS |
453 | /* If via wasn't specified then send out using device address */ |
454 | if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) | |
455 | err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, | |
456 | out_dev->dev_addr, skb); | |
457 | else | |
458 | err = neigh_xmit(nh->nh_via_table, out_dev, | |
459 | mpls_nh_via(rt, nh), skb); | |
0189197f EB |
460 | if (err) |
461 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", | |
462 | __func__, err); | |
463 | return 0; | |
464 | ||
27d69105 RS |
465 | tx_err: |
466 | out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; | |
467 | if (out_mdev) | |
468 | MPLS_INC_STATS(out_mdev, tx_errors); | |
469 | goto drop; | |
470 | err: | |
471 | MPLS_INC_STATS(mdev, rx_errors); | |
0189197f EB |
472 | drop: |
473 | kfree_skb(skb); | |
474 | return NET_RX_DROP; | |
475 | } | |
476 | ||
477 | static struct packet_type mpls_packet_type __read_mostly = { | |
478 | .type = cpu_to_be16(ETH_P_MPLS_UC), | |
479 | .func = mpls_forward, | |
480 | }; | |
481 | ||
f0126539 | 482 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
03c05665 EB |
483 | [RTA_DST] = { .type = NLA_U32 }, |
484 | [RTA_OIF] = { .type = NLA_U32 }, | |
5b441ac8 | 485 | [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, |
03c05665 EB |
486 | }; |
487 | ||
a2519929 | 488 | struct mpls_route_config { |
118d5234 RS |
489 | u32 rc_protocol; |
490 | u32 rc_ifindex; | |
f8efb73c RP |
491 | u8 rc_via_table; |
492 | u8 rc_via_alen; | |
118d5234 RS |
493 | u8 rc_via[MAX_VIA_ALEN]; |
494 | u32 rc_label; | |
5b441ac8 | 495 | u8 rc_ttl_propagate; |
f8efb73c | 496 | u8 rc_output_labels; |
118d5234 RS |
497 | u32 rc_output_label[MAX_NEW_LABELS]; |
498 | u32 rc_nlflags; | |
499 | enum mpls_payload_type rc_payload_type; | |
500 | struct nl_info rc_nlinfo; | |
f8efb73c RP |
501 | struct rtnexthop *rc_mp; |
502 | int rc_mp_len; | |
a2519929 EB |
503 | }; |
504 | ||
59b20966 DA |
505 | /* all nexthops within a route have the same size based on max |
506 | * number of labels and max via length for a hop | |
507 | */ | |
508 | static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) | |
0189197f | 509 | { |
59b20966 | 510 | u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); |
0189197f | 511 | struct mpls_route *rt; |
df1c6316 | 512 | size_t size; |
0189197f | 513 | |
df1c6316 DA |
514 | size = sizeof(*rt) + num_nh * nh_size; |
515 | if (size > MAX_MPLS_ROUTE_MEM) | |
516 | return ERR_PTR(-EINVAL); | |
517 | ||
518 | rt = kzalloc(size, GFP_KERNEL); | |
519 | if (!rt) | |
520 | return ERR_PTR(-ENOMEM); | |
521 | ||
522 | rt->rt_nhn = num_nh; | |
523 | rt->rt_nhn_alive = num_nh; | |
524 | rt->rt_nh_size = nh_size; | |
525 | rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); | |
f8efb73c | 526 | |
0189197f EB |
527 | return rt; |
528 | } | |
529 | ||
530 | static void mpls_rt_free(struct mpls_route *rt) | |
531 | { | |
532 | if (rt) | |
533 | kfree_rcu(rt, rt_rcu); | |
534 | } | |
535 | ||
8de147dc EB |
536 | static void mpls_notify_route(struct net *net, unsigned index, |
537 | struct mpls_route *old, struct mpls_route *new, | |
538 | const struct nl_info *info) | |
539 | { | |
540 | struct nlmsghdr *nlh = info ? info->nlh : NULL; | |
541 | unsigned portid = info ? info->portid : 0; | |
542 | int event = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
543 | struct mpls_route *rt = new ? new : old; | |
544 | unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; | |
545 | /* Ignore reserved labels for now */ | |
a6affd24 | 546 | if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) |
8de147dc EB |
547 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); |
548 | } | |
549 | ||
0189197f | 550 | static void mpls_route_update(struct net *net, unsigned index, |
f8efb73c | 551 | struct mpls_route *new, |
0189197f EB |
552 | const struct nl_info *info) |
553 | { | |
19d0c341 | 554 | struct mpls_route __rcu **platform_label; |
f8efb73c | 555 | struct mpls_route *rt; |
0189197f EB |
556 | |
557 | ASSERT_RTNL(); | |
558 | ||
19d0c341 EB |
559 | platform_label = rtnl_dereference(net->mpls.platform_label); |
560 | rt = rtnl_dereference(platform_label[index]); | |
f8efb73c | 561 | rcu_assign_pointer(platform_label[index], new); |
0189197f | 562 | |
f8efb73c | 563 | mpls_notify_route(net, index, rt, new, info); |
8de147dc | 564 | |
0189197f | 565 | /* If we removed a route free it now */ |
f8efb73c | 566 | mpls_rt_free(rt); |
0189197f EB |
567 | } |
568 | ||
a2519929 EB |
569 | static unsigned find_free_label(struct net *net) |
570 | { | |
19d0c341 EB |
571 | struct mpls_route __rcu **platform_label; |
572 | size_t platform_labels; | |
a2519929 | 573 | unsigned index; |
19d0c341 EB |
574 | |
575 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
576 | platform_labels = net->mpls.platform_labels; | |
a6affd24 RS |
577 | for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; |
578 | index++) { | |
19d0c341 | 579 | if (!rtnl_dereference(platform_label[index])) |
a2519929 EB |
580 | return index; |
581 | } | |
582 | return LABEL_NOT_SPECIFIED; | |
583 | } | |
584 | ||
bf21563a | 585 | #if IS_ENABLED(CONFIG_INET) |
cf4b24f0 RS |
586 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
587 | const void *addr) | |
01faef2c | 588 | { |
5a9348b5 | 589 | struct net_device *dev; |
01faef2c RP |
590 | struct rtable *rt; |
591 | struct in_addr daddr; | |
592 | ||
593 | memcpy(&daddr, addr, sizeof(struct in_addr)); | |
594 | rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); | |
595 | if (IS_ERR(rt)) | |
5a9348b5 | 596 | return ERR_CAST(rt); |
01faef2c RP |
597 | |
598 | dev = rt->dst.dev; | |
599 | dev_hold(dev); | |
600 | ||
601 | ip_rt_put(rt); | |
602 | ||
01faef2c | 603 | return dev; |
bf21563a RP |
604 | } |
605 | #else | |
cf4b24f0 RS |
606 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
607 | const void *addr) | |
bf21563a RP |
608 | { |
609 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c | 610 | } |
bf21563a | 611 | #endif |
01faef2c | 612 | |
bf21563a | 613 | #if IS_ENABLED(CONFIG_IPV6) |
cf4b24f0 RS |
614 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
615 | const void *addr) | |
01faef2c | 616 | { |
5a9348b5 | 617 | struct net_device *dev; |
01faef2c RP |
618 | struct dst_entry *dst; |
619 | struct flowi6 fl6; | |
bf21563a RP |
620 | int err; |
621 | ||
622 | if (!ipv6_stub) | |
623 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c RP |
624 | |
625 | memset(&fl6, 0, sizeof(fl6)); | |
626 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); | |
bf21563a RP |
627 | err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); |
628 | if (err) | |
5a9348b5 | 629 | return ERR_PTR(err); |
01faef2c RP |
630 | |
631 | dev = dst->dev; | |
632 | dev_hold(dev); | |
01faef2c RP |
633 | dst_release(dst); |
634 | ||
635 | return dev; | |
636 | } | |
bf21563a | 637 | #else |
cf4b24f0 RS |
638 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
639 | const void *addr) | |
bf21563a RP |
640 | { |
641 | return ERR_PTR(-EAFNOSUPPORT); | |
642 | } | |
643 | #endif | |
01faef2c RP |
644 | |
645 | static struct net_device *find_outdev(struct net *net, | |
cf4b24f0 | 646 | struct mpls_route *rt, |
f8efb73c | 647 | struct mpls_nh *nh, int oif) |
01faef2c RP |
648 | { |
649 | struct net_device *dev = NULL; | |
650 | ||
f8efb73c RP |
651 | if (!oif) { |
652 | switch (nh->nh_via_table) { | |
01faef2c | 653 | case NEIGH_ARP_TABLE: |
cf4b24f0 | 654 | dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
655 | break; |
656 | case NEIGH_ND_TABLE: | |
cf4b24f0 | 657 | dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
658 | break; |
659 | case NEIGH_LINK_TABLE: | |
660 | break; | |
661 | } | |
662 | } else { | |
f8efb73c | 663 | dev = dev_get_by_index(net, oif); |
01faef2c RP |
664 | } |
665 | ||
3dcb615e RP |
666 | if (!dev) |
667 | return ERR_PTR(-ENODEV); | |
668 | ||
94a57f1f RP |
669 | if (IS_ERR(dev)) |
670 | return dev; | |
671 | ||
f8efb73c RP |
672 | /* The caller is holding rtnl anyways, so release the dev reference */ |
673 | dev_put(dev); | |
674 | ||
01faef2c RP |
675 | return dev; |
676 | } | |
677 | ||
cf4b24f0 RS |
678 | static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, |
679 | struct mpls_nh *nh, int oif) | |
f8efb73c RP |
680 | { |
681 | struct net_device *dev = NULL; | |
682 | int err = -ENODEV; | |
683 | ||
cf4b24f0 | 684 | dev = find_outdev(net, rt, nh, oif); |
f8efb73c RP |
685 | if (IS_ERR(dev)) { |
686 | err = PTR_ERR(dev); | |
687 | dev = NULL; | |
688 | goto errout; | |
689 | } | |
690 | ||
691 | /* Ensure this is a supported device */ | |
692 | err = -EINVAL; | |
693 | if (!mpls_dev_get(dev)) | |
694 | goto errout; | |
695 | ||
a3e948e8 RS |
696 | if ((nh->nh_via_table == NEIGH_LINK_TABLE) && |
697 | (dev->addr_len != nh->nh_via_alen)) | |
698 | goto errout; | |
699 | ||
f8efb73c RP |
700 | RCU_INIT_POINTER(nh->nh_dev, dev); |
701 | ||
c89359a4 RP |
702 | if (!(dev->flags & IFF_UP)) { |
703 | nh->nh_flags |= RTNH_F_DEAD; | |
704 | } else { | |
705 | unsigned int flags; | |
706 | ||
707 | flags = dev_get_flags(dev); | |
708 | if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) | |
709 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
710 | } | |
711 | ||
f8efb73c RP |
712 | return 0; |
713 | ||
714 | errout: | |
715 | return err; | |
716 | } | |
717 | ||
d4e72560 DA |
718 | static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, |
719 | u8 via_addr[], struct netlink_ext_ack *extack) | |
720 | { | |
721 | struct rtvia *via = nla_data(nla); | |
722 | int err = -EINVAL; | |
723 | int alen; | |
724 | ||
725 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { | |
726 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
727 | "Invalid attribute length for RTA_VIA"); | |
728 | goto errout; | |
729 | } | |
730 | alen = nla_len(nla) - | |
731 | offsetof(struct rtvia, rtvia_addr); | |
732 | if (alen > MAX_VIA_ALEN) { | |
733 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
734 | "Invalid address length for RTA_VIA"); | |
735 | goto errout; | |
736 | } | |
737 | ||
738 | /* Validate the address family */ | |
739 | switch (via->rtvia_family) { | |
740 | case AF_PACKET: | |
741 | *via_table = NEIGH_LINK_TABLE; | |
742 | break; | |
743 | case AF_INET: | |
744 | *via_table = NEIGH_ARP_TABLE; | |
745 | if (alen != 4) | |
746 | goto errout; | |
747 | break; | |
748 | case AF_INET6: | |
749 | *via_table = NEIGH_ND_TABLE; | |
750 | if (alen != 16) | |
751 | goto errout; | |
752 | break; | |
753 | default: | |
754 | /* Unsupported address family */ | |
755 | goto errout; | |
756 | } | |
757 | ||
758 | memcpy(via_addr, via->rtvia_addr, alen); | |
759 | *via_alen = alen; | |
760 | err = 0; | |
761 | ||
762 | errout: | |
763 | return err; | |
764 | } | |
765 | ||
f8efb73c RP |
766 | static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, |
767 | struct mpls_route *rt) | |
768 | { | |
769 | struct net *net = cfg->rc_nlinfo.nl_net; | |
770 | struct mpls_nh *nh = rt->rt_nh; | |
771 | int err; | |
772 | int i; | |
773 | ||
774 | if (!nh) | |
775 | return -ENOMEM; | |
776 | ||
f8efb73c RP |
777 | nh->nh_labels = cfg->rc_output_labels; |
778 | for (i = 0; i < nh->nh_labels; i++) | |
779 | nh->nh_label[i] = cfg->rc_output_label[i]; | |
780 | ||
781 | nh->nh_via_table = cfg->rc_via_table; | |
cf4b24f0 | 782 | memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); |
f8efb73c RP |
783 | nh->nh_via_alen = cfg->rc_via_alen; |
784 | ||
cf4b24f0 | 785 | err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); |
f8efb73c RP |
786 | if (err) |
787 | goto errout; | |
788 | ||
c89359a4 RP |
789 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
790 | rt->rt_nhn_alive--; | |
791 | ||
f8efb73c RP |
792 | return 0; |
793 | ||
794 | errout: | |
795 | return err; | |
796 | } | |
797 | ||
cf4b24f0 | 798 | static int mpls_nh_build(struct net *net, struct mpls_route *rt, |
c89359a4 | 799 | struct mpls_nh *nh, int oif, struct nlattr *via, |
074350e2 DA |
800 | struct nlattr *newdst, u8 max_labels, |
801 | struct netlink_ext_ack *extack) | |
f8efb73c RP |
802 | { |
803 | int err = -ENOMEM; | |
804 | ||
805 | if (!nh) | |
806 | goto errout; | |
807 | ||
808 | if (newdst) { | |
a1f10abe | 809 | err = nla_get_labels(newdst, max_labels, &nh->nh_labels, |
074350e2 | 810 | nh->nh_label, extack); |
f8efb73c RP |
811 | if (err) |
812 | goto errout; | |
813 | } | |
814 | ||
f20367df RS |
815 | if (via) { |
816 | err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, | |
074350e2 | 817 | __mpls_nh_via(rt, nh), extack); |
f20367df RS |
818 | if (err) |
819 | goto errout; | |
820 | } else { | |
821 | nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; | |
822 | } | |
f8efb73c | 823 | |
cf4b24f0 | 824 | err = mpls_nh_assign_dev(net, rt, nh, oif); |
f8efb73c RP |
825 | if (err) |
826 | goto errout; | |
827 | ||
828 | return 0; | |
829 | ||
830 | errout: | |
831 | return err; | |
832 | } | |
833 | ||
77ef013a | 834 | static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, |
a4ac8c98 DA |
835 | u8 cfg_via_alen, u8 *max_via_alen, |
836 | u8 *max_labels) | |
f8efb73c | 837 | { |
f8efb73c | 838 | int remaining = len; |
77ef013a | 839 | u8 nhs = 0; |
f8efb73c | 840 | |
cf4b24f0 | 841 | *max_via_alen = 0; |
a4ac8c98 | 842 | *max_labels = 0; |
cf4b24f0 | 843 | |
f8efb73c | 844 | while (rtnh_ok(rtnh, remaining)) { |
cf4b24f0 RS |
845 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
846 | int attrlen; | |
a4ac8c98 | 847 | u8 n_labels = 0; |
cf4b24f0 RS |
848 | |
849 | attrlen = rtnh_attrlen(rtnh); | |
850 | nla = nla_find(attrs, attrlen, RTA_VIA); | |
851 | if (nla && nla_len(nla) >= | |
852 | offsetof(struct rtvia, rtvia_addr)) { | |
853 | int via_alen = nla_len(nla) - | |
854 | offsetof(struct rtvia, rtvia_addr); | |
855 | ||
856 | if (via_alen <= MAX_VIA_ALEN) | |
857 | *max_via_alen = max_t(u16, *max_via_alen, | |
858 | via_alen); | |
859 | } | |
860 | ||
a4ac8c98 DA |
861 | nla = nla_find(attrs, attrlen, RTA_NEWDST); |
862 | if (nla && | |
a1f10abe DA |
863 | nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, |
864 | NULL, NULL) != 0) | |
a4ac8c98 DA |
865 | return 0; |
866 | ||
867 | *max_labels = max_t(u8, *max_labels, n_labels); | |
868 | ||
77ef013a DA |
869 | /* number of nexthops is tracked by a u8. |
870 | * Check for overflow. | |
871 | */ | |
872 | if (nhs == 255) | |
873 | return 0; | |
f8efb73c | 874 | nhs++; |
77ef013a | 875 | |
f8efb73c RP |
876 | rtnh = rtnh_next(rtnh, &remaining); |
877 | } | |
878 | ||
879 | /* leftover implies invalid nexthop configuration, discard it */ | |
880 | return remaining > 0 ? 0 : nhs; | |
881 | } | |
882 | ||
883 | static int mpls_nh_build_multi(struct mpls_route_config *cfg, | |
074350e2 DA |
884 | struct mpls_route *rt, u8 max_labels, |
885 | struct netlink_ext_ack *extack) | |
f8efb73c RP |
886 | { |
887 | struct rtnexthop *rtnh = cfg->rc_mp; | |
888 | struct nlattr *nla_via, *nla_newdst; | |
889 | int remaining = cfg->rc_mp_len; | |
f8efb73c | 890 | int err = 0; |
77ef013a | 891 | u8 nhs = 0; |
f8efb73c RP |
892 | |
893 | change_nexthops(rt) { | |
894 | int attrlen; | |
895 | ||
896 | nla_via = NULL; | |
897 | nla_newdst = NULL; | |
898 | ||
899 | err = -EINVAL; | |
900 | if (!rtnh_ok(rtnh, remaining)) | |
901 | goto errout; | |
902 | ||
1c78efa8 RS |
903 | /* neither weighted multipath nor any flags |
904 | * are supported | |
905 | */ | |
906 | if (rtnh->rtnh_hops || rtnh->rtnh_flags) | |
907 | goto errout; | |
908 | ||
f8efb73c RP |
909 | attrlen = rtnh_attrlen(rtnh); |
910 | if (attrlen > 0) { | |
911 | struct nlattr *attrs = rtnh_attrs(rtnh); | |
912 | ||
913 | nla_via = nla_find(attrs, attrlen, RTA_VIA); | |
914 | nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); | |
915 | } | |
916 | ||
cf4b24f0 | 917 | err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, |
a4ac8c98 | 918 | rtnh->rtnh_ifindex, nla_via, nla_newdst, |
074350e2 | 919 | max_labels, extack); |
f8efb73c RP |
920 | if (err) |
921 | goto errout; | |
922 | ||
c89359a4 RP |
923 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
924 | rt->rt_nhn_alive--; | |
925 | ||
f8efb73c RP |
926 | rtnh = rtnh_next(rtnh, &remaining); |
927 | nhs++; | |
928 | } endfor_nexthops(rt); | |
929 | ||
930 | rt->rt_nhn = nhs; | |
931 | ||
932 | return 0; | |
933 | ||
934 | errout: | |
935 | return err; | |
936 | } | |
937 | ||
074350e2 DA |
938 | static bool mpls_label_ok(struct net *net, unsigned int index, |
939 | struct netlink_ext_ack *extack) | |
b7b386f4 DA |
940 | { |
941 | /* Reserved labels may not be set */ | |
074350e2 DA |
942 | if (index < MPLS_LABEL_FIRST_UNRESERVED) { |
943 | NL_SET_ERR_MSG(extack, | |
944 | "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); | |
b7b386f4 | 945 | return false; |
074350e2 | 946 | } |
b7b386f4 DA |
947 | |
948 | /* The full 20 bit range may not be supported. */ | |
074350e2 DA |
949 | if (index >= net->mpls.platform_labels) { |
950 | NL_SET_ERR_MSG(extack, | |
951 | "Label >= configured maximum in platform_labels"); | |
b7b386f4 | 952 | return false; |
074350e2 | 953 | } |
b7b386f4 DA |
954 | |
955 | return true; | |
956 | } | |
957 | ||
074350e2 DA |
958 | static int mpls_route_add(struct mpls_route_config *cfg, |
959 | struct netlink_ext_ack *extack) | |
a2519929 | 960 | { |
19d0c341 | 961 | struct mpls_route __rcu **platform_label; |
a2519929 | 962 | struct net *net = cfg->rc_nlinfo.nl_net; |
a2519929 | 963 | struct mpls_route *rt, *old; |
a2519929 | 964 | int err = -EINVAL; |
cf4b24f0 | 965 | u8 max_via_alen; |
f8efb73c | 966 | unsigned index; |
a4ac8c98 | 967 | u8 max_labels; |
77ef013a | 968 | u8 nhs; |
a2519929 EB |
969 | |
970 | index = cfg->rc_label; | |
971 | ||
972 | /* If a label was not specified during insert pick one */ | |
973 | if ((index == LABEL_NOT_SPECIFIED) && | |
974 | (cfg->rc_nlflags & NLM_F_CREATE)) { | |
975 | index = find_free_label(net); | |
976 | } | |
977 | ||
074350e2 | 978 | if (!mpls_label_ok(net, index, extack)) |
a2519929 EB |
979 | goto errout; |
980 | ||
a2519929 | 981 | /* Append makes no sense with mpls */ |
0f7bbd58 | 982 | err = -EOPNOTSUPP; |
074350e2 DA |
983 | if (cfg->rc_nlflags & NLM_F_APPEND) { |
984 | NL_SET_ERR_MSG(extack, "MPLS does not support route append"); | |
a2519929 | 985 | goto errout; |
074350e2 | 986 | } |
a2519929 EB |
987 | |
988 | err = -EEXIST; | |
19d0c341 EB |
989 | platform_label = rtnl_dereference(net->mpls.platform_label); |
990 | old = rtnl_dereference(platform_label[index]); | |
a2519929 EB |
991 | if ((cfg->rc_nlflags & NLM_F_EXCL) && old) |
992 | goto errout; | |
993 | ||
994 | err = -EEXIST; | |
995 | if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) | |
996 | goto errout; | |
997 | ||
998 | err = -ENOENT; | |
999 | if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) | |
1000 | goto errout; | |
1001 | ||
cf4b24f0 | 1002 | err = -EINVAL; |
a4ac8c98 DA |
1003 | if (cfg->rc_mp) { |
1004 | nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, | |
1005 | cfg->rc_via_alen, &max_via_alen, | |
1006 | &max_labels); | |
1007 | } else { | |
1008 | max_via_alen = cfg->rc_via_alen; | |
1009 | max_labels = cfg->rc_output_labels; | |
1010 | nhs = 1; | |
1011 | } | |
1012 | ||
074350e2 DA |
1013 | if (nhs == 0) { |
1014 | NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); | |
cf4b24f0 | 1015 | goto errout; |
074350e2 | 1016 | } |
f8efb73c | 1017 | |
a2519929 | 1018 | err = -ENOMEM; |
a4ac8c98 | 1019 | rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); |
df1c6316 DA |
1020 | if (IS_ERR(rt)) { |
1021 | err = PTR_ERR(rt); | |
a2519929 | 1022 | goto errout; |
df1c6316 | 1023 | } |
a2519929 | 1024 | |
a2519929 | 1025 | rt->rt_protocol = cfg->rc_protocol; |
118d5234 | 1026 | rt->rt_payload_type = cfg->rc_payload_type; |
5b441ac8 | 1027 | rt->rt_ttl_propagate = cfg->rc_ttl_propagate; |
a2519929 | 1028 | |
f8efb73c | 1029 | if (cfg->rc_mp) |
074350e2 | 1030 | err = mpls_nh_build_multi(cfg, rt, max_labels, extack); |
f8efb73c RP |
1031 | else |
1032 | err = mpls_nh_build_from_cfg(cfg, rt); | |
1033 | if (err) | |
1034 | goto freert; | |
1035 | ||
1036 | mpls_route_update(net, index, rt, &cfg->rc_nlinfo); | |
a2519929 | 1037 | |
a2519929 EB |
1038 | return 0; |
1039 | ||
f8efb73c RP |
1040 | freert: |
1041 | mpls_rt_free(rt); | |
a2519929 | 1042 | errout: |
a2519929 EB |
1043 | return err; |
1044 | } | |
1045 | ||
074350e2 DA |
1046 | static int mpls_route_del(struct mpls_route_config *cfg, |
1047 | struct netlink_ext_ack *extack) | |
a2519929 EB |
1048 | { |
1049 | struct net *net = cfg->rc_nlinfo.nl_net; | |
1050 | unsigned index; | |
1051 | int err = -EINVAL; | |
1052 | ||
1053 | index = cfg->rc_label; | |
1054 | ||
074350e2 | 1055 | if (!mpls_label_ok(net, index, extack)) |
a2519929 EB |
1056 | goto errout; |
1057 | ||
f8efb73c | 1058 | mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); |
a2519929 EB |
1059 | |
1060 | err = 0; | |
1061 | errout: | |
1062 | return err; | |
1063 | } | |
1064 | ||
27d69105 RS |
1065 | static void mpls_get_stats(struct mpls_dev *mdev, |
1066 | struct mpls_link_stats *stats) | |
1067 | { | |
1068 | struct mpls_pcpu_stats *p; | |
1069 | int i; | |
1070 | ||
1071 | memset(stats, 0, sizeof(*stats)); | |
1072 | ||
1073 | for_each_possible_cpu(i) { | |
1074 | struct mpls_link_stats local; | |
1075 | unsigned int start; | |
1076 | ||
1077 | p = per_cpu_ptr(mdev->stats, i); | |
1078 | do { | |
1079 | start = u64_stats_fetch_begin(&p->syncp); | |
1080 | local = p->stats; | |
1081 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1082 | ||
1083 | stats->rx_packets += local.rx_packets; | |
1084 | stats->rx_bytes += local.rx_bytes; | |
1085 | stats->tx_packets += local.tx_packets; | |
1086 | stats->tx_bytes += local.tx_bytes; | |
1087 | stats->rx_errors += local.rx_errors; | |
1088 | stats->tx_errors += local.tx_errors; | |
1089 | stats->rx_dropped += local.rx_dropped; | |
1090 | stats->tx_dropped += local.tx_dropped; | |
1091 | stats->rx_noroute += local.rx_noroute; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | static int mpls_fill_stats_af(struct sk_buff *skb, | |
1096 | const struct net_device *dev) | |
1097 | { | |
1098 | struct mpls_link_stats *stats; | |
1099 | struct mpls_dev *mdev; | |
1100 | struct nlattr *nla; | |
1101 | ||
1102 | mdev = mpls_dev_get(dev); | |
1103 | if (!mdev) | |
1104 | return -ENODATA; | |
1105 | ||
1106 | nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, | |
1107 | sizeof(struct mpls_link_stats), | |
1108 | MPLS_STATS_UNSPEC); | |
1109 | if (!nla) | |
1110 | return -EMSGSIZE; | |
1111 | ||
1112 | stats = nla_data(nla); | |
1113 | mpls_get_stats(mdev, stats); | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | static size_t mpls_get_stats_af_size(const struct net_device *dev) | |
1119 | { | |
1120 | struct mpls_dev *mdev; | |
1121 | ||
1122 | mdev = mpls_dev_get(dev); | |
1123 | if (!mdev) | |
1124 | return 0; | |
1125 | ||
1126 | return nla_total_size_64bit(sizeof(struct mpls_link_stats)); | |
1127 | } | |
1128 | ||
24045a03 DA |
1129 | static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, |
1130 | u32 portid, u32 seq, int event, | |
1131 | unsigned int flags, int type) | |
1132 | { | |
1133 | struct nlmsghdr *nlh; | |
1134 | struct netconfmsg *ncm; | |
1135 | bool all = false; | |
1136 | ||
1137 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
1138 | flags); | |
1139 | if (!nlh) | |
1140 | return -EMSGSIZE; | |
1141 | ||
1142 | if (type == NETCONFA_ALL) | |
1143 | all = true; | |
1144 | ||
1145 | ncm = nlmsg_data(nlh); | |
1146 | ncm->ncm_family = AF_MPLS; | |
1147 | ||
1148 | if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) | |
1149 | goto nla_put_failure; | |
1150 | ||
1151 | if ((all || type == NETCONFA_INPUT) && | |
1152 | nla_put_s32(skb, NETCONFA_INPUT, | |
1153 | mdev->input_enabled) < 0) | |
1154 | goto nla_put_failure; | |
1155 | ||
1156 | nlmsg_end(skb, nlh); | |
1157 | return 0; | |
1158 | ||
1159 | nla_put_failure: | |
1160 | nlmsg_cancel(skb, nlh); | |
1161 | return -EMSGSIZE; | |
1162 | } | |
1163 | ||
1164 | static int mpls_netconf_msgsize_devconf(int type) | |
1165 | { | |
1166 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
1167 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
1168 | bool all = false; | |
1169 | ||
1170 | if (type == NETCONFA_ALL) | |
1171 | all = true; | |
1172 | ||
1173 | if (all || type == NETCONFA_INPUT) | |
1174 | size += nla_total_size(4); | |
1175 | ||
1176 | return size; | |
1177 | } | |
1178 | ||
823566ae DA |
1179 | static void mpls_netconf_notify_devconf(struct net *net, int event, |
1180 | int type, struct mpls_dev *mdev) | |
24045a03 DA |
1181 | { |
1182 | struct sk_buff *skb; | |
1183 | int err = -ENOBUFS; | |
1184 | ||
1185 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); | |
1186 | if (!skb) | |
1187 | goto errout; | |
1188 | ||
823566ae | 1189 | err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); |
24045a03 DA |
1190 | if (err < 0) { |
1191 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ | |
1192 | WARN_ON(err == -EMSGSIZE); | |
1193 | kfree_skb(skb); | |
1194 | goto errout; | |
1195 | } | |
1196 | ||
1197 | rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); | |
1198 | return; | |
1199 | errout: | |
1200 | if (err < 0) | |
1201 | rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); | |
1202 | } | |
1203 | ||
1204 | static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { | |
1205 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1206 | }; | |
1207 | ||
1208 | static int mpls_netconf_get_devconf(struct sk_buff *in_skb, | |
c21ef3e3 DA |
1209 | struct nlmsghdr *nlh, |
1210 | struct netlink_ext_ack *extack) | |
24045a03 DA |
1211 | { |
1212 | struct net *net = sock_net(in_skb->sk); | |
1213 | struct nlattr *tb[NETCONFA_MAX + 1]; | |
1214 | struct netconfmsg *ncm; | |
1215 | struct net_device *dev; | |
1216 | struct mpls_dev *mdev; | |
1217 | struct sk_buff *skb; | |
1218 | int ifindex; | |
1219 | int err; | |
1220 | ||
1221 | err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, | |
fceb6435 | 1222 | devconf_mpls_policy, NULL); |
24045a03 DA |
1223 | if (err < 0) |
1224 | goto errout; | |
1225 | ||
1226 | err = -EINVAL; | |
1227 | if (!tb[NETCONFA_IFINDEX]) | |
1228 | goto errout; | |
1229 | ||
1230 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1231 | dev = __dev_get_by_index(net, ifindex); | |
1232 | if (!dev) | |
1233 | goto errout; | |
1234 | ||
1235 | mdev = mpls_dev_get(dev); | |
1236 | if (!mdev) | |
1237 | goto errout; | |
1238 | ||
1239 | err = -ENOBUFS; | |
1240 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); | |
1241 | if (!skb) | |
1242 | goto errout; | |
1243 | ||
1244 | err = mpls_netconf_fill_devconf(skb, mdev, | |
1245 | NETLINK_CB(in_skb).portid, | |
1246 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
1247 | NETCONFA_ALL); | |
1248 | if (err < 0) { | |
1249 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ | |
1250 | WARN_ON(err == -EMSGSIZE); | |
1251 | kfree_skb(skb); | |
1252 | goto errout; | |
1253 | } | |
1254 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1255 | errout: | |
1256 | return err; | |
1257 | } | |
1258 | ||
1259 | static int mpls_netconf_dump_devconf(struct sk_buff *skb, | |
1260 | struct netlink_callback *cb) | |
1261 | { | |
1262 | struct net *net = sock_net(skb->sk); | |
1263 | struct hlist_head *head; | |
1264 | struct net_device *dev; | |
1265 | struct mpls_dev *mdev; | |
1266 | int idx, s_idx; | |
1267 | int h, s_h; | |
1268 | ||
1269 | s_h = cb->args[0]; | |
1270 | s_idx = idx = cb->args[1]; | |
1271 | ||
1272 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1273 | idx = 0; | |
1274 | head = &net->dev_index_head[h]; | |
1275 | rcu_read_lock(); | |
1276 | cb->seq = net->dev_base_seq; | |
1277 | hlist_for_each_entry_rcu(dev, head, index_hlist) { | |
1278 | if (idx < s_idx) | |
1279 | goto cont; | |
1280 | mdev = mpls_dev_get(dev); | |
1281 | if (!mdev) | |
1282 | goto cont; | |
1283 | if (mpls_netconf_fill_devconf(skb, mdev, | |
1284 | NETLINK_CB(cb->skb).portid, | |
1285 | cb->nlh->nlmsg_seq, | |
1286 | RTM_NEWNETCONF, | |
1287 | NLM_F_MULTI, | |
1288 | NETCONFA_ALL) < 0) { | |
1289 | rcu_read_unlock(); | |
1290 | goto done; | |
1291 | } | |
1292 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
1293 | cont: | |
1294 | idx++; | |
1295 | } | |
1296 | rcu_read_unlock(); | |
1297 | } | |
1298 | done: | |
1299 | cb->args[0] = h; | |
1300 | cb->args[1] = idx; | |
1301 | ||
1302 | return skb->len; | |
1303 | } | |
1304 | ||
37bde799 RS |
1305 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
1306 | (&((struct mpls_dev *)0)->field) | |
1307 | ||
24045a03 DA |
1308 | static int mpls_conf_proc(struct ctl_table *ctl, int write, |
1309 | void __user *buffer, | |
1310 | size_t *lenp, loff_t *ppos) | |
1311 | { | |
1312 | int oval = *(int *)ctl->data; | |
1313 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1314 | ||
1315 | if (write) { | |
1316 | struct mpls_dev *mdev = ctl->extra1; | |
1317 | int i = (int *)ctl->data - (int *)mdev; | |
1318 | struct net *net = ctl->extra2; | |
1319 | int val = *(int *)ctl->data; | |
1320 | ||
1321 | if (i == offsetof(struct mpls_dev, input_enabled) && | |
1322 | val != oval) { | |
823566ae DA |
1323 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1324 | NETCONFA_INPUT, mdev); | |
24045a03 DA |
1325 | } |
1326 | } | |
1327 | ||
1328 | return ret; | |
1329 | } | |
1330 | ||
37bde799 RS |
1331 | static const struct ctl_table mpls_dev_table[] = { |
1332 | { | |
1333 | .procname = "input", | |
1334 | .maxlen = sizeof(int), | |
1335 | .mode = 0644, | |
24045a03 | 1336 | .proc_handler = mpls_conf_proc, |
37bde799 RS |
1337 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), |
1338 | }, | |
1339 | { } | |
1340 | }; | |
1341 | ||
1342 | static int mpls_dev_sysctl_register(struct net_device *dev, | |
1343 | struct mpls_dev *mdev) | |
1344 | { | |
1345 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; | |
24045a03 | 1346 | struct net *net = dev_net(dev); |
37bde799 RS |
1347 | struct ctl_table *table; |
1348 | int i; | |
1349 | ||
1350 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); | |
1351 | if (!table) | |
1352 | goto out; | |
1353 | ||
1354 | /* Table data contains only offsets relative to the base of | |
1355 | * the mdev at this point, so make them absolute. | |
1356 | */ | |
24045a03 | 1357 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { |
37bde799 | 1358 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; |
24045a03 DA |
1359 | table[i].extra1 = mdev; |
1360 | table[i].extra2 = net; | |
1361 | } | |
37bde799 RS |
1362 | |
1363 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); | |
1364 | ||
1182e4d0 | 1365 | mdev->sysctl = register_net_sysctl(net, path, table); |
37bde799 RS |
1366 | if (!mdev->sysctl) |
1367 | goto free; | |
1368 | ||
1182e4d0 | 1369 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); |
37bde799 RS |
1370 | return 0; |
1371 | ||
1372 | free: | |
1373 | kfree(table); | |
1374 | out: | |
1375 | return -ENOBUFS; | |
1376 | } | |
1377 | ||
1182e4d0 DA |
1378 | static void mpls_dev_sysctl_unregister(struct net_device *dev, |
1379 | struct mpls_dev *mdev) | |
37bde799 | 1380 | { |
1182e4d0 | 1381 | struct net *net = dev_net(dev); |
37bde799 RS |
1382 | struct ctl_table *table; |
1383 | ||
1384 | table = mdev->sysctl->ctl_table_arg; | |
1385 | unregister_net_sysctl_table(mdev->sysctl); | |
1386 | kfree(table); | |
1182e4d0 DA |
1387 | |
1388 | mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); | |
37bde799 RS |
1389 | } |
1390 | ||
03c57747 RS |
1391 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
1392 | { | |
1393 | struct mpls_dev *mdev; | |
1394 | int err = -ENOMEM; | |
27d69105 | 1395 | int i; |
03c57747 RS |
1396 | |
1397 | ASSERT_RTNL(); | |
1398 | ||
1399 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); | |
1400 | if (!mdev) | |
1401 | return ERR_PTR(err); | |
1402 | ||
27d69105 RS |
1403 | mdev->stats = alloc_percpu(struct mpls_pcpu_stats); |
1404 | if (!mdev->stats) | |
1405 | goto free; | |
1406 | ||
1407 | for_each_possible_cpu(i) { | |
1408 | struct mpls_pcpu_stats *mpls_stats; | |
1409 | ||
1410 | mpls_stats = per_cpu_ptr(mdev->stats, i); | |
1411 | u64_stats_init(&mpls_stats->syncp); | |
1412 | } | |
1413 | ||
1182e4d0 DA |
1414 | mdev->dev = dev; |
1415 | ||
37bde799 RS |
1416 | err = mpls_dev_sysctl_register(dev, mdev); |
1417 | if (err) | |
1418 | goto free; | |
1419 | ||
03c57747 RS |
1420 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
1421 | ||
1422 | return mdev; | |
37bde799 RS |
1423 | |
1424 | free: | |
27d69105 | 1425 | free_percpu(mdev->stats); |
37bde799 RS |
1426 | kfree(mdev); |
1427 | return ERR_PTR(err); | |
03c57747 RS |
1428 | } |
1429 | ||
27d69105 RS |
1430 | static void mpls_dev_destroy_rcu(struct rcu_head *head) |
1431 | { | |
1432 | struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); | |
1433 | ||
1434 | free_percpu(mdev->stats); | |
1435 | kfree(mdev); | |
1436 | } | |
1437 | ||
c89359a4 | 1438 | static void mpls_ifdown(struct net_device *dev, int event) |
0189197f | 1439 | { |
19d0c341 | 1440 | struct mpls_route __rcu **platform_label; |
0189197f | 1441 | struct net *net = dev_net(dev); |
77ef013a | 1442 | u8 alive, deleted; |
0189197f EB |
1443 | unsigned index; |
1444 | ||
19d0c341 | 1445 | platform_label = rtnl_dereference(net->mpls.platform_label); |
0189197f | 1446 | for (index = 0; index < net->mpls.platform_labels; index++) { |
19d0c341 | 1447 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
c89359a4 | 1448 | |
0189197f EB |
1449 | if (!rt) |
1450 | continue; | |
c89359a4 | 1451 | |
61733c91 | 1452 | alive = 0; |
4ea8efad | 1453 | deleted = 0; |
c89359a4 | 1454 | change_nexthops(rt) { |
39eb8cd1 DA |
1455 | unsigned int nh_flags = nh->nh_flags; |
1456 | ||
f8efb73c | 1457 | if (rtnl_dereference(nh->nh_dev) != dev) |
61733c91 DA |
1458 | goto next; |
1459 | ||
c89359a4 RP |
1460 | switch (event) { |
1461 | case NETDEV_DOWN: | |
1462 | case NETDEV_UNREGISTER: | |
39eb8cd1 | 1463 | nh_flags |= RTNH_F_DEAD; |
c89359a4 RP |
1464 | /* fall through */ |
1465 | case NETDEV_CHANGE: | |
39eb8cd1 | 1466 | nh_flags |= RTNH_F_LINKDOWN; |
c89359a4 RP |
1467 | break; |
1468 | } | |
1469 | if (event == NETDEV_UNREGISTER) | |
1470 | RCU_INIT_POINTER(nh->nh_dev, NULL); | |
39eb8cd1 DA |
1471 | |
1472 | if (nh->nh_flags != nh_flags) | |
1473 | WRITE_ONCE(nh->nh_flags, nh_flags); | |
61733c91 | 1474 | next: |
39eb8cd1 | 1475 | if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) |
61733c91 | 1476 | alive++; |
4ea8efad DA |
1477 | if (!rtnl_dereference(nh->nh_dev)) |
1478 | deleted++; | |
f8efb73c | 1479 | } endfor_nexthops(rt); |
61733c91 DA |
1480 | |
1481 | WRITE_ONCE(rt->rt_nhn_alive, alive); | |
4ea8efad DA |
1482 | |
1483 | /* if there are no more nexthops, delete the route */ | |
1484 | if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) | |
1485 | mpls_route_update(net, index, NULL, NULL); | |
0189197f | 1486 | } |
c89359a4 RP |
1487 | } |
1488 | ||
39eb8cd1 | 1489 | static void mpls_ifup(struct net_device *dev, unsigned int flags) |
c89359a4 RP |
1490 | { |
1491 | struct mpls_route __rcu **platform_label; | |
1492 | struct net *net = dev_net(dev); | |
1493 | unsigned index; | |
77ef013a | 1494 | u8 alive; |
c89359a4 RP |
1495 | |
1496 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
1497 | for (index = 0; index < net->mpls.platform_labels; index++) { | |
1498 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
1499 | ||
1500 | if (!rt) | |
1501 | continue; | |
37bde799 | 1502 | |
c89359a4 RP |
1503 | alive = 0; |
1504 | change_nexthops(rt) { | |
39eb8cd1 | 1505 | unsigned int nh_flags = nh->nh_flags; |
c89359a4 RP |
1506 | struct net_device *nh_dev = |
1507 | rtnl_dereference(nh->nh_dev); | |
03c57747 | 1508 | |
39eb8cd1 | 1509 | if (!(nh_flags & flags)) { |
c89359a4 RP |
1510 | alive++; |
1511 | continue; | |
1512 | } | |
1513 | if (nh_dev != dev) | |
1514 | continue; | |
1515 | alive++; | |
39eb8cd1 | 1516 | nh_flags &= ~flags; |
c2e8471d | 1517 | WRITE_ONCE(nh->nh_flags, nh_flags); |
c89359a4 RP |
1518 | } endfor_nexthops(rt); |
1519 | ||
39eb8cd1 | 1520 | WRITE_ONCE(rt->rt_nhn_alive, alive); |
c89359a4 | 1521 | } |
0189197f EB |
1522 | } |
1523 | ||
1524 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, | |
1525 | void *ptr) | |
1526 | { | |
1527 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
03c57747 | 1528 | struct mpls_dev *mdev; |
c89359a4 | 1529 | unsigned int flags; |
0189197f | 1530 | |
c89359a4 | 1531 | if (event == NETDEV_REGISTER) { |
407f31be | 1532 | /* For now just support Ethernet, IPGRE, SIT and IPIP devices */ |
0d227a86 SH |
1533 | if (dev->type == ARPHRD_ETHER || |
1534 | dev->type == ARPHRD_LOOPBACK || | |
407f31be SH |
1535 | dev->type == ARPHRD_IPGRE || |
1536 | dev->type == ARPHRD_SIT || | |
1537 | dev->type == ARPHRD_TUNNEL) { | |
03c57747 RS |
1538 | mdev = mpls_add_dev(dev); |
1539 | if (IS_ERR(mdev)) | |
1540 | return notifier_from_errno(PTR_ERR(mdev)); | |
1541 | } | |
c89359a4 RP |
1542 | return NOTIFY_OK; |
1543 | } | |
03c57747 | 1544 | |
c89359a4 RP |
1545 | mdev = mpls_dev_get(dev); |
1546 | if (!mdev) | |
1547 | return NOTIFY_OK; | |
1548 | ||
1549 | switch (event) { | |
1550 | case NETDEV_DOWN: | |
1551 | mpls_ifdown(dev, event); | |
1552 | break; | |
1553 | case NETDEV_UP: | |
1554 | flags = dev_get_flags(dev); | |
1555 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1556 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1557 | else | |
1558 | mpls_ifup(dev, RTNH_F_DEAD); | |
1559 | break; | |
1560 | case NETDEV_CHANGE: | |
1561 | flags = dev_get_flags(dev); | |
1562 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1563 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1564 | else | |
1565 | mpls_ifdown(dev, event); | |
1566 | break; | |
0189197f | 1567 | case NETDEV_UNREGISTER: |
c89359a4 RP |
1568 | mpls_ifdown(dev, event); |
1569 | mdev = mpls_dev_get(dev); | |
1570 | if (mdev) { | |
1182e4d0 | 1571 | mpls_dev_sysctl_unregister(dev, mdev); |
c89359a4 | 1572 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); |
27d69105 | 1573 | call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); |
c89359a4 | 1574 | } |
0189197f | 1575 | break; |
0fae3bf0 RS |
1576 | case NETDEV_CHANGENAME: |
1577 | mdev = mpls_dev_get(dev); | |
1578 | if (mdev) { | |
1579 | int err; | |
1580 | ||
1182e4d0 | 1581 | mpls_dev_sysctl_unregister(dev, mdev); |
0fae3bf0 RS |
1582 | err = mpls_dev_sysctl_register(dev, mdev); |
1583 | if (err) | |
1584 | return notifier_from_errno(err); | |
1585 | } | |
1586 | break; | |
0189197f EB |
1587 | } |
1588 | return NOTIFY_OK; | |
1589 | } | |
1590 | ||
1591 | static struct notifier_block mpls_dev_notifier = { | |
1592 | .notifier_call = mpls_dev_notify, | |
1593 | }; | |
1594 | ||
03c05665 | 1595 | static int nla_put_via(struct sk_buff *skb, |
b79bda3d | 1596 | u8 table, const void *addr, int alen) |
03c05665 | 1597 | { |
b79bda3d EB |
1598 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
1599 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, | |
1600 | }; | |
03c05665 EB |
1601 | struct nlattr *nla; |
1602 | struct rtvia *via; | |
b79bda3d | 1603 | int family = AF_UNSPEC; |
03c05665 EB |
1604 | |
1605 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
1606 | if (!nla) | |
1607 | return -EMSGSIZE; | |
1608 | ||
b79bda3d EB |
1609 | if (table <= NEIGH_NR_TABLES) |
1610 | family = table_to_family[table]; | |
1611 | ||
03c05665 EB |
1612 | via = nla_data(nla); |
1613 | via->rtvia_family = family; | |
1614 | memcpy(via->rtvia_addr, addr, alen); | |
1615 | return 0; | |
1616 | } | |
1617 | ||
966bae33 EB |
1618 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
1619 | u8 labels, const u32 label[]) | |
1620 | { | |
1621 | struct nlattr *nla; | |
1622 | struct mpls_shim_hdr *nla_label; | |
1623 | bool bos; | |
1624 | int i; | |
1625 | nla = nla_reserve(skb, attrtype, labels*4); | |
1626 | if (!nla) | |
1627 | return -EMSGSIZE; | |
1628 | ||
1629 | nla_label = nla_data(nla); | |
1630 | bos = true; | |
1631 | for (i = labels - 1; i >= 0; i--) { | |
1632 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); | |
1633 | bos = false; | |
1634 | } | |
1635 | ||
1636 | return 0; | |
1637 | } | |
face0188 | 1638 | EXPORT_SYMBOL_GPL(nla_put_labels); |
966bae33 | 1639 | |
a1f10abe DA |
1640 | int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, |
1641 | u32 label[], struct netlink_ext_ack *extack) | |
966bae33 EB |
1642 | { |
1643 | unsigned len = nla_len(nla); | |
966bae33 | 1644 | struct mpls_shim_hdr *nla_label; |
a4ac8c98 | 1645 | u8 nla_labels; |
966bae33 EB |
1646 | bool bos; |
1647 | int i; | |
1648 | ||
a4ac8c98 DA |
1649 | /* len needs to be an even multiple of 4 (the label size). Number |
1650 | * of labels is a u8 so check for overflow. | |
1651 | */ | |
a1f10abe DA |
1652 | if (len & 3 || len / 4 > 255) { |
1653 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1654 | "Invalid length for labels attribute"); | |
966bae33 | 1655 | return -EINVAL; |
a1f10abe | 1656 | } |
966bae33 EB |
1657 | |
1658 | /* Limit the number of new labels allowed */ | |
1659 | nla_labels = len/4; | |
a1f10abe DA |
1660 | if (nla_labels > max_labels) { |
1661 | NL_SET_ERR_MSG(extack, "Too many labels"); | |
966bae33 | 1662 | return -EINVAL; |
a1f10abe | 1663 | } |
966bae33 | 1664 | |
a4ac8c98 DA |
1665 | /* when label == NULL, caller wants number of labels */ |
1666 | if (!label) | |
1667 | goto out; | |
1668 | ||
966bae33 EB |
1669 | nla_label = nla_data(nla); |
1670 | bos = true; | |
1671 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { | |
1672 | struct mpls_entry_decoded dec; | |
1673 | dec = mpls_entry_decode(nla_label + i); | |
1674 | ||
1675 | /* Ensure the bottom of stack flag is properly set | |
1676 | * and ttl and tc are both clear. | |
1677 | */ | |
a1f10abe DA |
1678 | if (dec.ttl) { |
1679 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1680 | "TTL in label must be 0"); | |
1681 | return -EINVAL; | |
1682 | } | |
1683 | ||
1684 | if (dec.tc) { | |
1685 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1686 | "Traffic class in label must be 0"); | |
966bae33 | 1687 | return -EINVAL; |
a1f10abe DA |
1688 | } |
1689 | ||
1690 | if (dec.bos != bos) { | |
1691 | NL_SET_BAD_ATTR(extack, nla); | |
1692 | if (bos) { | |
1693 | NL_SET_ERR_MSG(extack, | |
1694 | "BOS bit must be set in first label"); | |
1695 | } else { | |
1696 | NL_SET_ERR_MSG(extack, | |
1697 | "BOS bit can only be set in first label"); | |
1698 | } | |
1699 | return -EINVAL; | |
1700 | } | |
966bae33 | 1701 | |
5a9ab017 | 1702 | switch (dec.label) { |
78f5b899 | 1703 | case MPLS_LABEL_IMPLNULL: |
5a9ab017 RS |
1704 | /* RFC3032: This is a label that an LSR may |
1705 | * assign and distribute, but which never | |
1706 | * actually appears in the encapsulation. | |
1707 | */ | |
a1f10abe DA |
1708 | NL_SET_ERR_MSG_ATTR(extack, nla, |
1709 | "Implicit NULL Label (3) can not be used in encapsulation"); | |
5a9ab017 RS |
1710 | return -EINVAL; |
1711 | } | |
1712 | ||
966bae33 EB |
1713 | label[i] = dec.label; |
1714 | } | |
a4ac8c98 | 1715 | out: |
966bae33 EB |
1716 | *labels = nla_labels; |
1717 | return 0; | |
1718 | } | |
face0188 | 1719 | EXPORT_SYMBOL_GPL(nla_get_labels); |
966bae33 | 1720 | |
074350e2 DA |
1721 | static int rtm_to_route_config(struct sk_buff *skb, |
1722 | struct nlmsghdr *nlh, | |
1723 | struct mpls_route_config *cfg, | |
1724 | struct netlink_ext_ack *extack) | |
03c05665 EB |
1725 | { |
1726 | struct rtmsg *rtm; | |
1727 | struct nlattr *tb[RTA_MAX+1]; | |
1728 | int index; | |
1729 | int err; | |
1730 | ||
fceb6435 | 1731 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy, |
074350e2 | 1732 | extack); |
03c05665 EB |
1733 | if (err < 0) |
1734 | goto errout; | |
1735 | ||
1736 | err = -EINVAL; | |
1737 | rtm = nlmsg_data(nlh); | |
03c05665 | 1738 | |
074350e2 DA |
1739 | if (rtm->rtm_family != AF_MPLS) { |
1740 | NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); | |
03c05665 | 1741 | goto errout; |
074350e2 DA |
1742 | } |
1743 | if (rtm->rtm_dst_len != 20) { | |
1744 | NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); | |
03c05665 | 1745 | goto errout; |
074350e2 DA |
1746 | } |
1747 | if (rtm->rtm_src_len != 0) { | |
1748 | NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); | |
03c05665 | 1749 | goto errout; |
074350e2 DA |
1750 | } |
1751 | if (rtm->rtm_tos != 0) { | |
1752 | NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); | |
03c05665 | 1753 | goto errout; |
074350e2 DA |
1754 | } |
1755 | if (rtm->rtm_table != RT_TABLE_MAIN) { | |
1756 | NL_SET_ERR_MSG(extack, | |
1757 | "MPLS only supports the main route table"); | |
03c05665 | 1758 | goto errout; |
074350e2 | 1759 | } |
03c05665 EB |
1760 | /* Any value is acceptable for rtm_protocol */ |
1761 | ||
1762 | /* As mpls uses destination specific addresses | |
1763 | * (or source specific address in the case of multicast) | |
1764 | * all addresses have universal scope. | |
1765 | */ | |
074350e2 DA |
1766 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { |
1767 | NL_SET_ERR_MSG(extack, | |
1768 | "Invalid route scope - MPLS only supports UNIVERSE"); | |
03c05665 | 1769 | goto errout; |
074350e2 DA |
1770 | } |
1771 | if (rtm->rtm_type != RTN_UNICAST) { | |
1772 | NL_SET_ERR_MSG(extack, | |
1773 | "Invalid route type - MPLS only supports UNICAST"); | |
03c05665 | 1774 | goto errout; |
074350e2 DA |
1775 | } |
1776 | if (rtm->rtm_flags != 0) { | |
1777 | NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); | |
03c05665 | 1778 | goto errout; |
074350e2 | 1779 | } |
03c05665 EB |
1780 | |
1781 | cfg->rc_label = LABEL_NOT_SPECIFIED; | |
1782 | cfg->rc_protocol = rtm->rtm_protocol; | |
eb7809f0 | 1783 | cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
5b441ac8 | 1784 | cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
03c05665 EB |
1785 | cfg->rc_nlflags = nlh->nlmsg_flags; |
1786 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; | |
1787 | cfg->rc_nlinfo.nlh = nlh; | |
1788 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); | |
1789 | ||
1790 | for (index = 0; index <= RTA_MAX; index++) { | |
1791 | struct nlattr *nla = tb[index]; | |
1792 | if (!nla) | |
1793 | continue; | |
1794 | ||
14dd3e1b | 1795 | switch (index) { |
03c05665 EB |
1796 | case RTA_OIF: |
1797 | cfg->rc_ifindex = nla_get_u32(nla); | |
1798 | break; | |
1799 | case RTA_NEWDST: | |
1800 | if (nla_get_labels(nla, MAX_NEW_LABELS, | |
1801 | &cfg->rc_output_labels, | |
074350e2 | 1802 | cfg->rc_output_label, extack)) |
03c05665 EB |
1803 | goto errout; |
1804 | break; | |
1805 | case RTA_DST: | |
1806 | { | |
f8efb73c | 1807 | u8 label_count; |
03c05665 | 1808 | if (nla_get_labels(nla, 1, &label_count, |
074350e2 | 1809 | &cfg->rc_label, extack)) |
03c05665 EB |
1810 | goto errout; |
1811 | ||
b7b386f4 | 1812 | if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, |
074350e2 | 1813 | cfg->rc_label, extack)) |
03c05665 | 1814 | goto errout; |
03c05665 EB |
1815 | break; |
1816 | } | |
1817 | case RTA_VIA: | |
1818 | { | |
f8efb73c | 1819 | if (nla_get_via(nla, &cfg->rc_via_alen, |
074350e2 DA |
1820 | &cfg->rc_via_table, cfg->rc_via, |
1821 | extack)) | |
03c05665 | 1822 | goto errout; |
f8efb73c RP |
1823 | break; |
1824 | } | |
1825 | case RTA_MULTIPATH: | |
1826 | { | |
1827 | cfg->rc_mp = nla_data(nla); | |
1828 | cfg->rc_mp_len = nla_len(nla); | |
03c05665 EB |
1829 | break; |
1830 | } | |
5b441ac8 RS |
1831 | case RTA_TTL_PROPAGATE: |
1832 | { | |
1833 | u8 ttl_propagate = nla_get_u8(nla); | |
1834 | ||
074350e2 DA |
1835 | if (ttl_propagate > 1) { |
1836 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
1837 | "RTA_TTL_PROPAGATE can only be 0 or 1"); | |
5b441ac8 | 1838 | goto errout; |
074350e2 | 1839 | } |
5b441ac8 RS |
1840 | cfg->rc_ttl_propagate = ttl_propagate ? |
1841 | MPLS_TTL_PROP_ENABLED : | |
1842 | MPLS_TTL_PROP_DISABLED; | |
1843 | break; | |
1844 | } | |
03c05665 | 1845 | default: |
074350e2 | 1846 | NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); |
03c05665 EB |
1847 | /* Unsupported attribute */ |
1848 | goto errout; | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | err = 0; | |
1853 | errout: | |
1854 | return err; | |
1855 | } | |
1856 | ||
c21ef3e3 DA |
1857 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
1858 | struct netlink_ext_ack *extack) | |
03c05665 | 1859 | { |
a4ac8c98 | 1860 | struct mpls_route_config *cfg; |
03c05665 EB |
1861 | int err; |
1862 | ||
a4ac8c98 DA |
1863 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
1864 | if (!cfg) | |
1865 | return -ENOMEM; | |
1866 | ||
074350e2 | 1867 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
03c05665 | 1868 | if (err < 0) |
a4ac8c98 | 1869 | goto out; |
03c05665 | 1870 | |
074350e2 | 1871 | err = mpls_route_del(cfg, extack); |
a4ac8c98 DA |
1872 | out: |
1873 | kfree(cfg); | |
1874 | ||
1875 | return err; | |
03c05665 EB |
1876 | } |
1877 | ||
1878 | ||
c21ef3e3 DA |
1879 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
1880 | struct netlink_ext_ack *extack) | |
03c05665 | 1881 | { |
a4ac8c98 | 1882 | struct mpls_route_config *cfg; |
03c05665 EB |
1883 | int err; |
1884 | ||
a4ac8c98 DA |
1885 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
1886 | if (!cfg) | |
1887 | return -ENOMEM; | |
1888 | ||
074350e2 | 1889 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
03c05665 | 1890 | if (err < 0) |
a4ac8c98 | 1891 | goto out; |
03c05665 | 1892 | |
074350e2 | 1893 | err = mpls_route_add(cfg, extack); |
a4ac8c98 DA |
1894 | out: |
1895 | kfree(cfg); | |
1896 | ||
1897 | return err; | |
03c05665 EB |
1898 | } |
1899 | ||
1900 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, | |
1901 | u32 label, struct mpls_route *rt, int flags) | |
1902 | { | |
19d0c341 | 1903 | struct net_device *dev; |
03c05665 EB |
1904 | struct nlmsghdr *nlh; |
1905 | struct rtmsg *rtm; | |
1906 | ||
1907 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); | |
1908 | if (nlh == NULL) | |
1909 | return -EMSGSIZE; | |
1910 | ||
1911 | rtm = nlmsg_data(nlh); | |
1912 | rtm->rtm_family = AF_MPLS; | |
1913 | rtm->rtm_dst_len = 20; | |
1914 | rtm->rtm_src_len = 0; | |
1915 | rtm->rtm_tos = 0; | |
1916 | rtm->rtm_table = RT_TABLE_MAIN; | |
1917 | rtm->rtm_protocol = rt->rt_protocol; | |
1918 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1919 | rtm->rtm_type = RTN_UNICAST; | |
1920 | rtm->rtm_flags = 0; | |
1921 | ||
03c05665 EB |
1922 | if (nla_put_labels(skb, RTA_DST, 1, &label)) |
1923 | goto nla_put_failure; | |
5b441ac8 RS |
1924 | |
1925 | if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { | |
1926 | bool ttl_propagate = | |
1927 | rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; | |
1928 | ||
1929 | if (nla_put_u8(skb, RTA_TTL_PROPAGATE, | |
1930 | ttl_propagate)) | |
1931 | goto nla_put_failure; | |
1932 | } | |
f8efb73c | 1933 | if (rt->rt_nhn == 1) { |
cf4b24f0 | 1934 | const struct mpls_nh *nh = rt->rt_nh; |
f8efb73c RP |
1935 | |
1936 | if (nh->nh_labels && | |
1937 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
1938 | nh->nh_label)) | |
1939 | goto nla_put_failure; | |
eb7809f0 | 1940 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
72dcac96 | 1941 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
f8efb73c RP |
1942 | nh->nh_via_alen)) |
1943 | goto nla_put_failure; | |
1944 | dev = rtnl_dereference(nh->nh_dev); | |
1945 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
1946 | goto nla_put_failure; | |
c89359a4 RP |
1947 | if (nh->nh_flags & RTNH_F_LINKDOWN) |
1948 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
1949 | if (nh->nh_flags & RTNH_F_DEAD) | |
1950 | rtm->rtm_flags |= RTNH_F_DEAD; | |
f8efb73c RP |
1951 | } else { |
1952 | struct rtnexthop *rtnh; | |
1953 | struct nlattr *mp; | |
77ef013a DA |
1954 | u8 linkdown = 0; |
1955 | u8 dead = 0; | |
f8efb73c RP |
1956 | |
1957 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
1958 | if (!mp) | |
1959 | goto nla_put_failure; | |
1960 | ||
1961 | for_nexthops(rt) { | |
c00e51dd DA |
1962 | dev = rtnl_dereference(nh->nh_dev); |
1963 | if (!dev) | |
1964 | continue; | |
1965 | ||
f8efb73c RP |
1966 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
1967 | if (!rtnh) | |
1968 | goto nla_put_failure; | |
1969 | ||
c00e51dd | 1970 | rtnh->rtnh_ifindex = dev->ifindex; |
c89359a4 RP |
1971 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
1972 | rtnh->rtnh_flags |= RTNH_F_LINKDOWN; | |
1973 | linkdown++; | |
1974 | } | |
1975 | if (nh->nh_flags & RTNH_F_DEAD) { | |
1976 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
1977 | dead++; | |
1978 | } | |
1979 | ||
f8efb73c RP |
1980 | if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, |
1981 | nh->nh_labels, | |
1982 | nh->nh_label)) | |
1983 | goto nla_put_failure; | |
f20367df RS |
1984 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
1985 | nla_put_via(skb, nh->nh_via_table, | |
cf4b24f0 | 1986 | mpls_nh_via(rt, nh), |
f8efb73c RP |
1987 | nh->nh_via_alen)) |
1988 | goto nla_put_failure; | |
1989 | ||
1990 | /* length of rtnetlink header + attributes */ | |
1991 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
1992 | } endfor_nexthops(rt); | |
1993 | ||
c89359a4 RP |
1994 | if (linkdown == rt->rt_nhn) |
1995 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
1996 | if (dead == rt->rt_nhn) | |
1997 | rtm->rtm_flags |= RTNH_F_DEAD; | |
1998 | ||
f8efb73c RP |
1999 | nla_nest_end(skb, mp); |
2000 | } | |
03c05665 EB |
2001 | |
2002 | nlmsg_end(skb, nlh); | |
2003 | return 0; | |
2004 | ||
2005 | nla_put_failure: | |
2006 | nlmsg_cancel(skb, nlh); | |
2007 | return -EMSGSIZE; | |
2008 | } | |
2009 | ||
2010 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) | |
2011 | { | |
2012 | struct net *net = sock_net(skb->sk); | |
19d0c341 EB |
2013 | struct mpls_route __rcu **platform_label; |
2014 | size_t platform_labels; | |
03c05665 EB |
2015 | unsigned int index; |
2016 | ||
2017 | ASSERT_RTNL(); | |
2018 | ||
2019 | index = cb->args[0]; | |
a6affd24 RS |
2020 | if (index < MPLS_LABEL_FIRST_UNRESERVED) |
2021 | index = MPLS_LABEL_FIRST_UNRESERVED; | |
03c05665 | 2022 | |
19d0c341 EB |
2023 | platform_label = rtnl_dereference(net->mpls.platform_label); |
2024 | platform_labels = net->mpls.platform_labels; | |
2025 | for (; index < platform_labels; index++) { | |
03c05665 | 2026 | struct mpls_route *rt; |
19d0c341 | 2027 | rt = rtnl_dereference(platform_label[index]); |
03c05665 EB |
2028 | if (!rt) |
2029 | continue; | |
2030 | ||
2031 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, | |
2032 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, | |
2033 | index, rt, NLM_F_MULTI) < 0) | |
2034 | break; | |
2035 | } | |
2036 | cb->args[0] = index; | |
2037 | ||
2038 | return skb->len; | |
2039 | } | |
2040 | ||
8de147dc EB |
2041 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
2042 | { | |
2043 | size_t payload = | |
2044 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
5b441ac8 RS |
2045 | + nla_total_size(4) /* RTA_DST */ |
2046 | + nla_total_size(1); /* RTA_TTL_PROPAGATE */ | |
f8efb73c RP |
2047 | |
2048 | if (rt->rt_nhn == 1) { | |
2049 | struct mpls_nh *nh = rt->rt_nh; | |
2050 | ||
2051 | if (nh->nh_dev) | |
2052 | payload += nla_total_size(4); /* RTA_OIF */ | |
eb7809f0 | 2053 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ |
72dcac96 | 2054 | payload += nla_total_size(2 + nh->nh_via_alen); |
f8efb73c RP |
2055 | if (nh->nh_labels) /* RTA_NEWDST */ |
2056 | payload += nla_total_size(nh->nh_labels * 4); | |
2057 | } else { | |
2058 | /* each nexthop is packed in an attribute */ | |
2059 | size_t nhsize = 0; | |
2060 | ||
2061 | for_nexthops(rt) { | |
e944e97a DA |
2062 | if (!rtnl_dereference(nh->nh_dev)) |
2063 | continue; | |
f8efb73c | 2064 | nhsize += nla_total_size(sizeof(struct rtnexthop)); |
f20367df RS |
2065 | /* RTA_VIA */ |
2066 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) | |
2067 | nhsize += nla_total_size(2 + nh->nh_via_alen); | |
f8efb73c RP |
2068 | if (nh->nh_labels) |
2069 | nhsize += nla_total_size(nh->nh_labels * 4); | |
2070 | } endfor_nexthops(rt); | |
2071 | /* nested attribute */ | |
2072 | payload += nla_total_size(nhsize); | |
2073 | } | |
2074 | ||
8de147dc EB |
2075 | return payload; |
2076 | } | |
2077 | ||
2078 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, | |
2079 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
2080 | unsigned int nlm_flags) | |
2081 | { | |
2082 | struct sk_buff *skb; | |
2083 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
2084 | int err = -ENOBUFS; | |
2085 | ||
2086 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
2087 | if (skb == NULL) | |
2088 | goto errout; | |
2089 | ||
2090 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); | |
2091 | if (err < 0) { | |
2092 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
2093 | WARN_ON(err == -EMSGSIZE); | |
2094 | kfree_skb(skb); | |
2095 | goto errout; | |
2096 | } | |
2097 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); | |
2098 | ||
2099 | return; | |
2100 | errout: | |
2101 | if (err < 0) | |
2102 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); | |
2103 | } | |
2104 | ||
397fc9e5 RP |
2105 | static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
2106 | struct netlink_ext_ack *extack) | |
2107 | { | |
2108 | struct net *net = sock_net(in_skb->sk); | |
2109 | u32 portid = NETLINK_CB(in_skb).portid; | |
a906c1aa | 2110 | u32 in_label = LABEL_NOT_SPECIFIED; |
397fc9e5 RP |
2111 | struct nlattr *tb[RTA_MAX + 1]; |
2112 | u32 labels[MAX_NEW_LABELS]; | |
2113 | struct mpls_shim_hdr *hdr; | |
2114 | unsigned int hdr_size = 0; | |
2115 | struct net_device *dev; | |
2116 | struct mpls_route *rt; | |
2117 | struct rtmsg *rtm, *r; | |
2118 | struct nlmsghdr *nlh; | |
2119 | struct sk_buff *skb; | |
2120 | struct mpls_nh *nh; | |
397fc9e5 | 2121 | u8 n_labels; |
a906c1aa | 2122 | int err; |
397fc9e5 RP |
2123 | |
2124 | err = nlmsg_parse(in_nlh, sizeof(*rtm), tb, RTA_MAX, | |
ca4a1cd9 | 2125 | rtm_mpls_policy, extack); |
397fc9e5 RP |
2126 | if (err < 0) |
2127 | goto errout; | |
2128 | ||
2129 | rtm = nlmsg_data(in_nlh); | |
2130 | ||
2131 | if (tb[RTA_DST]) { | |
2132 | u8 label_count; | |
2133 | ||
2134 | if (nla_get_labels(tb[RTA_DST], 1, &label_count, | |
a906c1aa RP |
2135 | &in_label, extack)) { |
2136 | err = -EINVAL; | |
397fc9e5 | 2137 | goto errout; |
a906c1aa | 2138 | } |
397fc9e5 | 2139 | |
a906c1aa RP |
2140 | if (!mpls_label_ok(net, in_label, extack)) { |
2141 | err = -EINVAL; | |
397fc9e5 | 2142 | goto errout; |
a906c1aa | 2143 | } |
397fc9e5 RP |
2144 | } |
2145 | ||
2146 | rt = mpls_route_input_rcu(net, in_label); | |
2147 | if (!rt) { | |
2148 | err = -ENETUNREACH; | |
2149 | goto errout; | |
2150 | } | |
2151 | ||
2152 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { | |
2153 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
2154 | if (!skb) { | |
2155 | err = -ENOBUFS; | |
2156 | goto errout; | |
2157 | } | |
2158 | ||
2159 | err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, | |
2160 | RTM_NEWROUTE, in_label, rt, 0); | |
2161 | if (err < 0) { | |
2162 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
2163 | WARN_ON(err == -EMSGSIZE); | |
2164 | goto errout_free; | |
2165 | } | |
2166 | ||
2167 | return rtnl_unicast(skb, net, portid); | |
2168 | } | |
2169 | ||
2170 | if (tb[RTA_NEWDST]) { | |
2171 | if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, | |
2172 | labels, extack) != 0) { | |
2173 | err = -EINVAL; | |
2174 | goto errout; | |
2175 | } | |
2176 | ||
2177 | hdr_size = n_labels * sizeof(struct mpls_shim_hdr); | |
2178 | } | |
2179 | ||
2180 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2181 | if (!skb) { | |
2182 | err = -ENOBUFS; | |
2183 | goto errout; | |
2184 | } | |
2185 | ||
2186 | skb->protocol = htons(ETH_P_MPLS_UC); | |
2187 | ||
2188 | if (hdr_size) { | |
2189 | bool bos; | |
2190 | int i; | |
2191 | ||
2192 | if (skb_cow(skb, hdr_size)) { | |
2193 | err = -ENOBUFS; | |
2194 | goto errout_free; | |
2195 | } | |
2196 | ||
2197 | skb_reserve(skb, hdr_size); | |
2198 | skb_push(skb, hdr_size); | |
2199 | skb_reset_network_header(skb); | |
2200 | ||
2201 | /* Push new labels */ | |
2202 | hdr = mpls_hdr(skb); | |
2203 | bos = true; | |
2204 | for (i = n_labels - 1; i >= 0; i--) { | |
2205 | hdr[i] = mpls_entry_encode(labels[i], | |
2206 | 1, 0, bos); | |
2207 | bos = false; | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | nh = mpls_select_multipath(rt, skb); | |
2212 | if (!nh) { | |
2213 | err = -ENETUNREACH; | |
2214 | goto errout_free; | |
2215 | } | |
2216 | ||
2217 | if (hdr_size) { | |
2218 | skb_pull(skb, hdr_size); | |
2219 | skb_reset_network_header(skb); | |
2220 | } | |
2221 | ||
2222 | nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, | |
2223 | RTM_NEWROUTE, sizeof(*r), 0); | |
2224 | if (!nlh) { | |
2225 | err = -EMSGSIZE; | |
2226 | goto errout_free; | |
2227 | } | |
2228 | ||
2229 | r = nlmsg_data(nlh); | |
2230 | r->rtm_family = AF_MPLS; | |
2231 | r->rtm_dst_len = 20; | |
2232 | r->rtm_src_len = 0; | |
2233 | r->rtm_table = RT_TABLE_MAIN; | |
2234 | r->rtm_type = RTN_UNICAST; | |
2235 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2236 | r->rtm_protocol = rt->rt_protocol; | |
2237 | r->rtm_flags = 0; | |
2238 | ||
2239 | if (nla_put_labels(skb, RTA_DST, 1, &in_label)) | |
2240 | goto nla_put_failure; | |
2241 | ||
2242 | if (nh->nh_labels && | |
2243 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
2244 | nh->nh_label)) | |
2245 | goto nla_put_failure; | |
2246 | ||
2247 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && | |
2248 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), | |
2249 | nh->nh_via_alen)) | |
2250 | goto nla_put_failure; | |
2251 | dev = rtnl_dereference(nh->nh_dev); | |
2252 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
2253 | goto nla_put_failure; | |
2254 | ||
2255 | nlmsg_end(skb, nlh); | |
2256 | ||
2257 | err = rtnl_unicast(skb, net, portid); | |
2258 | errout: | |
2259 | return err; | |
2260 | ||
2261 | nla_put_failure: | |
2262 | nlmsg_cancel(skb, nlh); | |
2263 | err = -EMSGSIZE; | |
2264 | errout_free: | |
2265 | kfree_skb(skb); | |
2266 | return err; | |
2267 | } | |
2268 | ||
7720c01f EB |
2269 | static int resize_platform_label_table(struct net *net, size_t limit) |
2270 | { | |
2271 | size_t size = sizeof(struct mpls_route *) * limit; | |
2272 | size_t old_limit; | |
2273 | size_t cp_size; | |
2274 | struct mpls_route __rcu **labels = NULL, **old; | |
2275 | struct mpls_route *rt0 = NULL, *rt2 = NULL; | |
2276 | unsigned index; | |
2277 | ||
2278 | if (size) { | |
752ade68 | 2279 | labels = kvzalloc(size, GFP_KERNEL); |
7720c01f EB |
2280 | if (!labels) |
2281 | goto nolabels; | |
2282 | } | |
2283 | ||
2284 | /* In case the predefined labels need to be populated */ | |
78f5b899 | 2285 | if (limit > MPLS_LABEL_IPV4NULL) { |
7720c01f | 2286 | struct net_device *lo = net->loopback_dev; |
a4ac8c98 | 2287 | rt0 = mpls_rt_alloc(1, lo->addr_len, 0); |
df1c6316 | 2288 | if (IS_ERR(rt0)) |
7720c01f | 2289 | goto nort0; |
f8efb73c | 2290 | RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); |
7720c01f | 2291 | rt0->rt_protocol = RTPROT_KERNEL; |
118d5234 | 2292 | rt0->rt_payload_type = MPT_IPV4; |
5b441ac8 | 2293 | rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
f8efb73c | 2294 | rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 2295 | rt0->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
2296 | memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, |
2297 | lo->addr_len); | |
7720c01f | 2298 | } |
78f5b899 | 2299 | if (limit > MPLS_LABEL_IPV6NULL) { |
7720c01f | 2300 | struct net_device *lo = net->loopback_dev; |
a4ac8c98 | 2301 | rt2 = mpls_rt_alloc(1, lo->addr_len, 0); |
df1c6316 | 2302 | if (IS_ERR(rt2)) |
7720c01f | 2303 | goto nort2; |
f8efb73c | 2304 | RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); |
7720c01f | 2305 | rt2->rt_protocol = RTPROT_KERNEL; |
118d5234 | 2306 | rt2->rt_payload_type = MPT_IPV6; |
6a18c312 | 2307 | rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
f8efb73c | 2308 | rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 2309 | rt2->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
2310 | memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, |
2311 | lo->addr_len); | |
7720c01f EB |
2312 | } |
2313 | ||
2314 | rtnl_lock(); | |
2315 | /* Remember the original table */ | |
19d0c341 | 2316 | old = rtnl_dereference(net->mpls.platform_label); |
7720c01f EB |
2317 | old_limit = net->mpls.platform_labels; |
2318 | ||
2319 | /* Free any labels beyond the new table */ | |
2320 | for (index = limit; index < old_limit; index++) | |
f8efb73c | 2321 | mpls_route_update(net, index, NULL, NULL); |
7720c01f EB |
2322 | |
2323 | /* Copy over the old labels */ | |
2324 | cp_size = size; | |
2325 | if (old_limit < limit) | |
2326 | cp_size = old_limit * sizeof(struct mpls_route *); | |
2327 | ||
2328 | memcpy(labels, old, cp_size); | |
2329 | ||
2330 | /* If needed set the predefined labels */ | |
78f5b899 TH |
2331 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
2332 | (limit > MPLS_LABEL_IPV6NULL)) { | |
2333 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); | |
7720c01f EB |
2334 | rt2 = NULL; |
2335 | } | |
2336 | ||
78f5b899 TH |
2337 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
2338 | (limit > MPLS_LABEL_IPV4NULL)) { | |
2339 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); | |
7720c01f EB |
2340 | rt0 = NULL; |
2341 | } | |
2342 | ||
2343 | /* Update the global pointers */ | |
2344 | net->mpls.platform_labels = limit; | |
19d0c341 | 2345 | rcu_assign_pointer(net->mpls.platform_label, labels); |
7720c01f EB |
2346 | |
2347 | rtnl_unlock(); | |
2348 | ||
2349 | mpls_rt_free(rt2); | |
2350 | mpls_rt_free(rt0); | |
2351 | ||
2352 | if (old) { | |
2353 | synchronize_rcu(); | |
2354 | kvfree(old); | |
2355 | } | |
2356 | return 0; | |
2357 | ||
2358 | nort2: | |
2359 | mpls_rt_free(rt0); | |
2360 | nort0: | |
2361 | kvfree(labels); | |
2362 | nolabels: | |
2363 | return -ENOMEM; | |
2364 | } | |
2365 | ||
2366 | static int mpls_platform_labels(struct ctl_table *table, int write, | |
2367 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2368 | { | |
2369 | struct net *net = table->data; | |
2370 | int platform_labels = net->mpls.platform_labels; | |
2371 | int ret; | |
2372 | struct ctl_table tmp = { | |
2373 | .procname = table->procname, | |
2374 | .data = &platform_labels, | |
2375 | .maxlen = sizeof(int), | |
2376 | .mode = table->mode, | |
2377 | .extra1 = &zero, | |
2378 | .extra2 = &label_limit, | |
2379 | }; | |
2380 | ||
2381 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2382 | ||
2383 | if (write && ret == 0) | |
2384 | ret = resize_platform_label_table(net, platform_labels); | |
2385 | ||
2386 | return ret; | |
2387 | } | |
2388 | ||
5b441ac8 RS |
2389 | #define MPLS_NS_SYSCTL_OFFSET(field) \ |
2390 | (&((struct net *)0)->field) | |
2391 | ||
37bde799 | 2392 | static const struct ctl_table mpls_table[] = { |
7720c01f EB |
2393 | { |
2394 | .procname = "platform_labels", | |
2395 | .data = NULL, | |
2396 | .maxlen = sizeof(int), | |
2397 | .mode = 0644, | |
2398 | .proc_handler = mpls_platform_labels, | |
2399 | }, | |
5b441ac8 RS |
2400 | { |
2401 | .procname = "ip_ttl_propagate", | |
2402 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), | |
2403 | .maxlen = sizeof(int), | |
2404 | .mode = 0644, | |
2405 | .proc_handler = proc_dointvec_minmax, | |
2406 | .extra1 = &zero, | |
2407 | .extra2 = &one, | |
2408 | }, | |
a59166e4 RS |
2409 | { |
2410 | .procname = "default_ttl", | |
2411 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), | |
2412 | .maxlen = sizeof(int), | |
2413 | .mode = 0644, | |
2414 | .proc_handler = proc_dointvec_minmax, | |
2415 | .extra1 = &one, | |
2416 | .extra2 = &ttl_max, | |
2417 | }, | |
7720c01f EB |
2418 | { } |
2419 | }; | |
2420 | ||
0189197f EB |
2421 | static int mpls_net_init(struct net *net) |
2422 | { | |
7720c01f | 2423 | struct ctl_table *table; |
5b441ac8 | 2424 | int i; |
7720c01f | 2425 | |
0189197f EB |
2426 | net->mpls.platform_labels = 0; |
2427 | net->mpls.platform_label = NULL; | |
5b441ac8 | 2428 | net->mpls.ip_ttl_propagate = 1; |
a59166e4 | 2429 | net->mpls.default_ttl = 255; |
0189197f | 2430 | |
7720c01f EB |
2431 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
2432 | if (table == NULL) | |
2433 | return -ENOMEM; | |
2434 | ||
5b441ac8 RS |
2435 | /* Table data contains only offsets relative to the base of |
2436 | * the mdev at this point, so make them absolute. | |
2437 | */ | |
2438 | for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) | |
2439 | table[i].data = (char *)net + (uintptr_t)table[i].data; | |
2440 | ||
7720c01f | 2441 | net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); |
6ea3c9d5 NA |
2442 | if (net->mpls.ctl == NULL) { |
2443 | kfree(table); | |
7720c01f | 2444 | return -ENOMEM; |
6ea3c9d5 | 2445 | } |
7720c01f | 2446 | |
0189197f EB |
2447 | return 0; |
2448 | } | |
2449 | ||
2450 | static void mpls_net_exit(struct net *net) | |
2451 | { | |
19d0c341 EB |
2452 | struct mpls_route __rcu **platform_label; |
2453 | size_t platform_labels; | |
7720c01f | 2454 | struct ctl_table *table; |
0189197f EB |
2455 | unsigned int index; |
2456 | ||
7720c01f EB |
2457 | table = net->mpls.ctl->ctl_table_arg; |
2458 | unregister_net_sysctl_table(net->mpls.ctl); | |
2459 | kfree(table); | |
2460 | ||
19d0c341 EB |
2461 | /* An rcu grace period has passed since there was a device in |
2462 | * the network namespace (and thus the last in flight packet) | |
0189197f EB |
2463 | * left this network namespace. This is because |
2464 | * unregister_netdevice_many and netdev_run_todo has completed | |
2465 | * for each network device that was in this network namespace. | |
2466 | * | |
2467 | * As such no additional rcu synchronization is necessary when | |
2468 | * freeing the platform_label table. | |
2469 | */ | |
2470 | rtnl_lock(); | |
19d0c341 EB |
2471 | platform_label = rtnl_dereference(net->mpls.platform_label); |
2472 | platform_labels = net->mpls.platform_labels; | |
2473 | for (index = 0; index < platform_labels; index++) { | |
2474 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
2475 | RCU_INIT_POINTER(platform_label[index], NULL); | |
e37791ec | 2476 | mpls_notify_route(net, index, rt, NULL, NULL); |
0189197f EB |
2477 | mpls_rt_free(rt); |
2478 | } | |
2479 | rtnl_unlock(); | |
2480 | ||
19d0c341 | 2481 | kvfree(platform_label); |
0189197f EB |
2482 | } |
2483 | ||
2484 | static struct pernet_operations mpls_net_ops = { | |
2485 | .init = mpls_net_init, | |
2486 | .exit = mpls_net_exit, | |
2487 | }; | |
2488 | ||
27d69105 RS |
2489 | static struct rtnl_af_ops mpls_af_ops __read_mostly = { |
2490 | .family = AF_MPLS, | |
2491 | .fill_stats_af = mpls_fill_stats_af, | |
2492 | .get_stats_af_size = mpls_get_stats_af_size, | |
2493 | }; | |
2494 | ||
0189197f EB |
2495 | static int __init mpls_init(void) |
2496 | { | |
2497 | int err; | |
2498 | ||
2499 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); | |
2500 | ||
2501 | err = register_pernet_subsys(&mpls_net_ops); | |
2502 | if (err) | |
2503 | goto out; | |
2504 | ||
2505 | err = register_netdevice_notifier(&mpls_dev_notifier); | |
2506 | if (err) | |
2507 | goto out_unregister_pernet; | |
2508 | ||
2509 | dev_add_pack(&mpls_packet_type); | |
2510 | ||
27d69105 RS |
2511 | rtnl_af_register(&mpls_af_ops); |
2512 | ||
b97bac64 FW |
2513 | rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, 0); |
2514 | rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, 0); | |
397fc9e5 | 2515 | rtnl_register(PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, |
b97bac64 | 2516 | 0); |
24045a03 | 2517 | rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf, |
b97bac64 | 2518 | mpls_netconf_dump_devconf, 0); |
bdc47641 AK |
2519 | err = ipgre_tunnel_encap_add_mpls_ops(); |
2520 | if (err) | |
2521 | pr_err("Can't add mpls over gre tunnel ops\n"); | |
2522 | ||
0189197f EB |
2523 | err = 0; |
2524 | out: | |
2525 | return err; | |
2526 | ||
2527 | out_unregister_pernet: | |
2528 | unregister_pernet_subsys(&mpls_net_ops); | |
2529 | goto out; | |
2530 | } | |
2531 | module_init(mpls_init); | |
2532 | ||
2533 | static void __exit mpls_exit(void) | |
2534 | { | |
03c05665 | 2535 | rtnl_unregister_all(PF_MPLS); |
27d69105 | 2536 | rtnl_af_unregister(&mpls_af_ops); |
0189197f EB |
2537 | dev_remove_pack(&mpls_packet_type); |
2538 | unregister_netdevice_notifier(&mpls_dev_notifier); | |
2539 | unregister_pernet_subsys(&mpls_net_ops); | |
bdc47641 | 2540 | ipgre_tunnel_encap_del_mpls_ops(); |
0189197f EB |
2541 | } |
2542 | module_exit(mpls_exit); | |
2543 | ||
2544 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); | |
2545 | MODULE_LICENSE("GPL v2"); | |
2546 | MODULE_ALIAS_NETPROTO(PF_MPLS); |