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Commit | Line | Data |
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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> | |
4b5edb2f | 10 | #include <linux/vmalloc.h> |
0189197f EB |
11 | #include <net/ip.h> |
12 | #include <net/dst.h> | |
13 | #include <net/sock.h> | |
14 | #include <net/arp.h> | |
15 | #include <net/ip_fib.h> | |
16 | #include <net/netevent.h> | |
17 | #include <net/netns/generic.h> | |
bf21563a RP |
18 | #if IS_ENABLED(CONFIG_IPV6) |
19 | #include <net/ipv6.h> | |
20 | #include <net/addrconf.h> | |
21 | #endif | |
f8efb73c | 22 | #include <net/nexthop.h> |
0189197f EB |
23 | #include "internal.h" |
24 | ||
1c78efa8 RS |
25 | /* Maximum number of labels to look ahead at when selecting a path of |
26 | * a multipath route | |
27 | */ | |
28 | #define MAX_MP_SELECT_LABELS 4 | |
29 | ||
eb7809f0 RS |
30 | #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) |
31 | ||
7720c01f EB |
32 | static int zero = 0; |
33 | static int label_limit = (1 << 20) - 1; | |
34 | ||
8de147dc EB |
35 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, |
36 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
37 | unsigned int nlm_flags); | |
38 | ||
0189197f EB |
39 | static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) |
40 | { | |
41 | struct mpls_route *rt = NULL; | |
42 | ||
43 | if (index < net->mpls.platform_labels) { | |
44 | struct mpls_route __rcu **platform_label = | |
45 | rcu_dereference(net->mpls.platform_label); | |
46 | rt = rcu_dereference(platform_label[index]); | |
47 | } | |
48 | return rt; | |
49 | } | |
50 | ||
03c57747 RS |
51 | static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) |
52 | { | |
53 | return rcu_dereference_rtnl(dev->mpls_ptr); | |
54 | } | |
55 | ||
face0188 | 56 | bool mpls_output_possible(const struct net_device *dev) |
0189197f EB |
57 | { |
58 | return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); | |
59 | } | |
face0188 | 60 | EXPORT_SYMBOL_GPL(mpls_output_possible); |
0189197f | 61 | |
cf4b24f0 RS |
62 | static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) |
63 | { | |
64 | u8 *nh0_via = PTR_ALIGN((u8 *)&rt->rt_nh[rt->rt_nhn], VIA_ALEN_ALIGN); | |
65 | int nh_index = nh - rt->rt_nh; | |
66 | ||
67 | return nh0_via + rt->rt_max_alen * nh_index; | |
68 | } | |
69 | ||
70 | static const u8 *mpls_nh_via(const struct mpls_route *rt, | |
71 | const struct mpls_nh *nh) | |
72 | { | |
73 | return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); | |
74 | } | |
75 | ||
f8efb73c | 76 | static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) |
0189197f EB |
77 | { |
78 | /* The size of the layer 2.5 labels to be added for this route */ | |
f8efb73c | 79 | return nh->nh_labels * sizeof(struct mpls_shim_hdr); |
0189197f EB |
80 | } |
81 | ||
face0188 | 82 | unsigned int mpls_dev_mtu(const struct net_device *dev) |
0189197f EB |
83 | { |
84 | /* The amount of data the layer 2 frame can hold */ | |
85 | return dev->mtu; | |
86 | } | |
face0188 | 87 | EXPORT_SYMBOL_GPL(mpls_dev_mtu); |
0189197f | 88 | |
face0188 | 89 | bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
0189197f EB |
90 | { |
91 | if (skb->len <= mtu) | |
92 | return false; | |
93 | ||
94 | if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu) | |
95 | return false; | |
96 | ||
97 | return true; | |
98 | } | |
face0188 | 99 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
0189197f | 100 | |
1c78efa8 RS |
101 | static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, |
102 | struct sk_buff *skb, bool bos) | |
f8efb73c | 103 | { |
1c78efa8 RS |
104 | struct mpls_entry_decoded dec; |
105 | struct mpls_shim_hdr *hdr; | |
106 | bool eli_seen = false; | |
107 | int label_index; | |
108 | int nh_index = 0; | |
109 | u32 hash = 0; | |
110 | ||
111 | /* No need to look further into packet if there's only | |
112 | * one path | |
113 | */ | |
114 | if (rt->rt_nhn == 1) | |
115 | goto out; | |
116 | ||
117 | for (label_index = 0; label_index < MAX_MP_SELECT_LABELS && !bos; | |
118 | label_index++) { | |
119 | if (!pskb_may_pull(skb, sizeof(*hdr) * label_index)) | |
120 | break; | |
121 | ||
122 | /* Read and decode the current label */ | |
123 | hdr = mpls_hdr(skb) + label_index; | |
124 | dec = mpls_entry_decode(hdr); | |
125 | ||
126 | /* RFC6790 - reserved labels MUST NOT be used as keys | |
127 | * for the load-balancing function | |
128 | */ | |
129 | if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { | |
130 | hash = jhash_1word(dec.label, hash); | |
131 | ||
132 | /* The entropy label follows the entropy label | |
133 | * indicator, so this means that the entropy | |
134 | * label was just added to the hash - no need to | |
135 | * go any deeper either in the label stack or in the | |
136 | * payload | |
137 | */ | |
138 | if (eli_seen) | |
139 | break; | |
140 | } else if (dec.label == MPLS_LABEL_ENTROPY) { | |
141 | eli_seen = true; | |
142 | } | |
143 | ||
144 | bos = dec.bos; | |
145 | if (bos && pskb_may_pull(skb, sizeof(*hdr) * label_index + | |
146 | sizeof(struct iphdr))) { | |
147 | const struct iphdr *v4hdr; | |
148 | ||
149 | v4hdr = (const struct iphdr *)(mpls_hdr(skb) + | |
150 | label_index); | |
151 | if (v4hdr->version == 4) { | |
152 | hash = jhash_3words(ntohl(v4hdr->saddr), | |
153 | ntohl(v4hdr->daddr), | |
154 | v4hdr->protocol, hash); | |
155 | } else if (v4hdr->version == 6 && | |
156 | pskb_may_pull(skb, sizeof(*hdr) * label_index + | |
157 | sizeof(struct ipv6hdr))) { | |
158 | const struct ipv6hdr *v6hdr; | |
159 | ||
160 | v6hdr = (const struct ipv6hdr *)(mpls_hdr(skb) + | |
161 | label_index); | |
162 | ||
163 | hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); | |
164 | hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); | |
165 | hash = jhash_1word(v6hdr->nexthdr, hash); | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | nh_index = hash % rt->rt_nhn; | |
171 | out: | |
172 | return &rt->rt_nh[nh_index]; | |
f8efb73c RP |
173 | } |
174 | ||
0189197f EB |
175 | static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb, |
176 | struct mpls_entry_decoded dec) | |
177 | { | |
118d5234 RS |
178 | enum mpls_payload_type payload_type; |
179 | bool success = false; | |
0189197f | 180 | |
76fecd82 EB |
181 | /* The IPv4 code below accesses through the IPv4 header |
182 | * checksum, which is 12 bytes into the packet. | |
183 | * The IPv6 code below accesses through the IPv6 hop limit | |
184 | * which is 8 bytes into the packet. | |
185 | * | |
186 | * For all supported cases there should always be at least 12 | |
187 | * bytes of packet data present. The IPv4 header is 20 bytes | |
188 | * without options and the IPv6 header is always 40 bytes | |
189 | * long. | |
190 | */ | |
191 | if (!pskb_may_pull(skb, 12)) | |
192 | return false; | |
193 | ||
118d5234 RS |
194 | payload_type = rt->rt_payload_type; |
195 | if (payload_type == MPT_UNSPEC) | |
196 | payload_type = ip_hdr(skb)->version; | |
197 | ||
198 | switch (payload_type) { | |
199 | case MPT_IPV4: { | |
200 | struct iphdr *hdr4 = ip_hdr(skb); | |
0189197f EB |
201 | skb->protocol = htons(ETH_P_IP); |
202 | csum_replace2(&hdr4->check, | |
203 | htons(hdr4->ttl << 8), | |
204 | htons(dec.ttl << 8)); | |
205 | hdr4->ttl = dec.ttl; | |
118d5234 RS |
206 | success = true; |
207 | break; | |
0189197f | 208 | } |
118d5234 | 209 | case MPT_IPV6: { |
0189197f EB |
210 | struct ipv6hdr *hdr6 = ipv6_hdr(skb); |
211 | skb->protocol = htons(ETH_P_IPV6); | |
212 | hdr6->hop_limit = dec.ttl; | |
118d5234 RS |
213 | success = true; |
214 | break; | |
0189197f | 215 | } |
118d5234 RS |
216 | case MPT_UNSPEC: |
217 | break; | |
218 | } | |
219 | ||
0189197f EB |
220 | return success; |
221 | } | |
222 | ||
223 | static int mpls_forward(struct sk_buff *skb, struct net_device *dev, | |
224 | struct packet_type *pt, struct net_device *orig_dev) | |
225 | { | |
226 | struct net *net = dev_net(dev); | |
227 | struct mpls_shim_hdr *hdr; | |
228 | struct mpls_route *rt; | |
f8efb73c | 229 | struct mpls_nh *nh; |
0189197f EB |
230 | struct mpls_entry_decoded dec; |
231 | struct net_device *out_dev; | |
03c57747 | 232 | struct mpls_dev *mdev; |
0189197f EB |
233 | unsigned int hh_len; |
234 | unsigned int new_header_size; | |
235 | unsigned int mtu; | |
236 | int err; | |
237 | ||
238 | /* Careful this entire function runs inside of an rcu critical section */ | |
239 | ||
03c57747 | 240 | mdev = mpls_dev_get(dev); |
37bde799 | 241 | if (!mdev || !mdev->input_enabled) |
03c57747 RS |
242 | goto drop; |
243 | ||
0189197f EB |
244 | if (skb->pkt_type != PACKET_HOST) |
245 | goto drop; | |
246 | ||
247 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
248 | goto drop; | |
249 | ||
250 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
251 | goto drop; | |
252 | ||
253 | /* Read and decode the label */ | |
254 | hdr = mpls_hdr(skb); | |
255 | dec = mpls_entry_decode(hdr); | |
256 | ||
257 | /* Pop the label */ | |
258 | skb_pull(skb, sizeof(*hdr)); | |
259 | skb_reset_network_header(skb); | |
260 | ||
261 | skb_orphan(skb); | |
262 | ||
263 | rt = mpls_route_input_rcu(net, dec.label); | |
264 | if (!rt) | |
265 | goto drop; | |
266 | ||
1c78efa8 | 267 | nh = mpls_select_multipath(rt, skb, dec.bos); |
f8efb73c RP |
268 | if (!nh) |
269 | goto drop; | |
270 | ||
0189197f | 271 | /* Find the output device */ |
f8efb73c | 272 | out_dev = rcu_dereference(nh->nh_dev); |
0189197f EB |
273 | if (!mpls_output_possible(out_dev)) |
274 | goto drop; | |
275 | ||
276 | if (skb_warn_if_lro(skb)) | |
277 | goto drop; | |
278 | ||
279 | skb_forward_csum(skb); | |
280 | ||
281 | /* Verify ttl is valid */ | |
aa7da937 | 282 | if (dec.ttl <= 1) |
0189197f EB |
283 | goto drop; |
284 | dec.ttl -= 1; | |
285 | ||
286 | /* Verify the destination can hold the packet */ | |
f8efb73c | 287 | new_header_size = mpls_nh_header_size(nh); |
0189197f EB |
288 | mtu = mpls_dev_mtu(out_dev); |
289 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) | |
290 | goto drop; | |
291 | ||
292 | hh_len = LL_RESERVED_SPACE(out_dev); | |
293 | if (!out_dev->header_ops) | |
294 | hh_len = 0; | |
295 | ||
296 | /* Ensure there is enough space for the headers in the skb */ | |
297 | if (skb_cow(skb, hh_len + new_header_size)) | |
298 | goto drop; | |
299 | ||
300 | skb->dev = out_dev; | |
301 | skb->protocol = htons(ETH_P_MPLS_UC); | |
302 | ||
303 | if (unlikely(!new_header_size && dec.bos)) { | |
304 | /* Penultimate hop popping */ | |
305 | if (!mpls_egress(rt, skb, dec)) | |
306 | goto drop; | |
307 | } else { | |
308 | bool bos; | |
309 | int i; | |
310 | skb_push(skb, new_header_size); | |
311 | skb_reset_network_header(skb); | |
312 | /* Push the new labels */ | |
313 | hdr = mpls_hdr(skb); | |
314 | bos = dec.bos; | |
f8efb73c RP |
315 | for (i = nh->nh_labels - 1; i >= 0; i--) { |
316 | hdr[i] = mpls_entry_encode(nh->nh_label[i], | |
317 | dec.ttl, 0, bos); | |
0189197f EB |
318 | bos = false; |
319 | } | |
320 | } | |
321 | ||
eb7809f0 RS |
322 | /* If via wasn't specified then send out using device address */ |
323 | if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) | |
324 | err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, | |
325 | out_dev->dev_addr, skb); | |
326 | else | |
327 | err = neigh_xmit(nh->nh_via_table, out_dev, | |
328 | mpls_nh_via(rt, nh), skb); | |
0189197f EB |
329 | if (err) |
330 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", | |
331 | __func__, err); | |
332 | return 0; | |
333 | ||
334 | drop: | |
335 | kfree_skb(skb); | |
336 | return NET_RX_DROP; | |
337 | } | |
338 | ||
339 | static struct packet_type mpls_packet_type __read_mostly = { | |
340 | .type = cpu_to_be16(ETH_P_MPLS_UC), | |
341 | .func = mpls_forward, | |
342 | }; | |
343 | ||
f0126539 | 344 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
03c05665 EB |
345 | [RTA_DST] = { .type = NLA_U32 }, |
346 | [RTA_OIF] = { .type = NLA_U32 }, | |
347 | }; | |
348 | ||
a2519929 | 349 | struct mpls_route_config { |
118d5234 RS |
350 | u32 rc_protocol; |
351 | u32 rc_ifindex; | |
f8efb73c RP |
352 | u8 rc_via_table; |
353 | u8 rc_via_alen; | |
118d5234 RS |
354 | u8 rc_via[MAX_VIA_ALEN]; |
355 | u32 rc_label; | |
f8efb73c | 356 | u8 rc_output_labels; |
118d5234 RS |
357 | u32 rc_output_label[MAX_NEW_LABELS]; |
358 | u32 rc_nlflags; | |
359 | enum mpls_payload_type rc_payload_type; | |
360 | struct nl_info rc_nlinfo; | |
f8efb73c RP |
361 | struct rtnexthop *rc_mp; |
362 | int rc_mp_len; | |
a2519929 EB |
363 | }; |
364 | ||
cf4b24f0 | 365 | static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen) |
0189197f | 366 | { |
cf4b24f0 | 367 | u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN); |
0189197f EB |
368 | struct mpls_route *rt; |
369 | ||
cf4b24f0 RS |
370 | rt = kzalloc(ALIGN(sizeof(*rt) + num_nh * sizeof(*rt->rt_nh), |
371 | VIA_ALEN_ALIGN) + | |
372 | num_nh * max_alen_aligned, | |
f8efb73c | 373 | GFP_KERNEL); |
cf4b24f0 | 374 | if (rt) { |
f8efb73c | 375 | rt->rt_nhn = num_nh; |
cf4b24f0 RS |
376 | rt->rt_max_alen = max_alen_aligned; |
377 | } | |
f8efb73c | 378 | |
0189197f EB |
379 | return rt; |
380 | } | |
381 | ||
382 | static void mpls_rt_free(struct mpls_route *rt) | |
383 | { | |
384 | if (rt) | |
385 | kfree_rcu(rt, rt_rcu); | |
386 | } | |
387 | ||
8de147dc EB |
388 | static void mpls_notify_route(struct net *net, unsigned index, |
389 | struct mpls_route *old, struct mpls_route *new, | |
390 | const struct nl_info *info) | |
391 | { | |
392 | struct nlmsghdr *nlh = info ? info->nlh : NULL; | |
393 | unsigned portid = info ? info->portid : 0; | |
394 | int event = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
395 | struct mpls_route *rt = new ? new : old; | |
396 | unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; | |
397 | /* Ignore reserved labels for now */ | |
a6affd24 | 398 | if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) |
8de147dc EB |
399 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); |
400 | } | |
401 | ||
0189197f | 402 | static void mpls_route_update(struct net *net, unsigned index, |
f8efb73c | 403 | struct mpls_route *new, |
0189197f EB |
404 | const struct nl_info *info) |
405 | { | |
19d0c341 | 406 | struct mpls_route __rcu **platform_label; |
f8efb73c | 407 | struct mpls_route *rt; |
0189197f EB |
408 | |
409 | ASSERT_RTNL(); | |
410 | ||
19d0c341 EB |
411 | platform_label = rtnl_dereference(net->mpls.platform_label); |
412 | rt = rtnl_dereference(platform_label[index]); | |
f8efb73c | 413 | rcu_assign_pointer(platform_label[index], new); |
0189197f | 414 | |
f8efb73c | 415 | mpls_notify_route(net, index, rt, new, info); |
8de147dc | 416 | |
0189197f | 417 | /* If we removed a route free it now */ |
f8efb73c | 418 | mpls_rt_free(rt); |
0189197f EB |
419 | } |
420 | ||
a2519929 EB |
421 | static unsigned find_free_label(struct net *net) |
422 | { | |
19d0c341 EB |
423 | struct mpls_route __rcu **platform_label; |
424 | size_t platform_labels; | |
a2519929 | 425 | unsigned index; |
19d0c341 EB |
426 | |
427 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
428 | platform_labels = net->mpls.platform_labels; | |
a6affd24 RS |
429 | for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; |
430 | index++) { | |
19d0c341 | 431 | if (!rtnl_dereference(platform_label[index])) |
a2519929 EB |
432 | return index; |
433 | } | |
434 | return LABEL_NOT_SPECIFIED; | |
435 | } | |
436 | ||
bf21563a | 437 | #if IS_ENABLED(CONFIG_INET) |
cf4b24f0 RS |
438 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
439 | const void *addr) | |
01faef2c | 440 | { |
5a9348b5 | 441 | struct net_device *dev; |
01faef2c RP |
442 | struct rtable *rt; |
443 | struct in_addr daddr; | |
444 | ||
445 | memcpy(&daddr, addr, sizeof(struct in_addr)); | |
446 | rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); | |
447 | if (IS_ERR(rt)) | |
5a9348b5 | 448 | return ERR_CAST(rt); |
01faef2c RP |
449 | |
450 | dev = rt->dst.dev; | |
451 | dev_hold(dev); | |
452 | ||
453 | ip_rt_put(rt); | |
454 | ||
01faef2c | 455 | return dev; |
bf21563a RP |
456 | } |
457 | #else | |
cf4b24f0 RS |
458 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
459 | const void *addr) | |
bf21563a RP |
460 | { |
461 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c | 462 | } |
bf21563a | 463 | #endif |
01faef2c | 464 | |
bf21563a | 465 | #if IS_ENABLED(CONFIG_IPV6) |
cf4b24f0 RS |
466 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
467 | const void *addr) | |
01faef2c | 468 | { |
5a9348b5 | 469 | struct net_device *dev; |
01faef2c RP |
470 | struct dst_entry *dst; |
471 | struct flowi6 fl6; | |
bf21563a RP |
472 | int err; |
473 | ||
474 | if (!ipv6_stub) | |
475 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c RP |
476 | |
477 | memset(&fl6, 0, sizeof(fl6)); | |
478 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); | |
bf21563a RP |
479 | err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); |
480 | if (err) | |
5a9348b5 | 481 | return ERR_PTR(err); |
01faef2c RP |
482 | |
483 | dev = dst->dev; | |
484 | dev_hold(dev); | |
01faef2c RP |
485 | dst_release(dst); |
486 | ||
487 | return dev; | |
488 | } | |
bf21563a | 489 | #else |
cf4b24f0 RS |
490 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
491 | const void *addr) | |
bf21563a RP |
492 | { |
493 | return ERR_PTR(-EAFNOSUPPORT); | |
494 | } | |
495 | #endif | |
01faef2c RP |
496 | |
497 | static struct net_device *find_outdev(struct net *net, | |
cf4b24f0 | 498 | struct mpls_route *rt, |
f8efb73c | 499 | struct mpls_nh *nh, int oif) |
01faef2c RP |
500 | { |
501 | struct net_device *dev = NULL; | |
502 | ||
f8efb73c RP |
503 | if (!oif) { |
504 | switch (nh->nh_via_table) { | |
01faef2c | 505 | case NEIGH_ARP_TABLE: |
cf4b24f0 | 506 | dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
507 | break; |
508 | case NEIGH_ND_TABLE: | |
cf4b24f0 | 509 | dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
510 | break; |
511 | case NEIGH_LINK_TABLE: | |
512 | break; | |
513 | } | |
514 | } else { | |
f8efb73c | 515 | dev = dev_get_by_index(net, oif); |
01faef2c RP |
516 | } |
517 | ||
3dcb615e RP |
518 | if (!dev) |
519 | return ERR_PTR(-ENODEV); | |
520 | ||
f8efb73c RP |
521 | /* The caller is holding rtnl anyways, so release the dev reference */ |
522 | dev_put(dev); | |
523 | ||
01faef2c RP |
524 | return dev; |
525 | } | |
526 | ||
cf4b24f0 RS |
527 | static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, |
528 | struct mpls_nh *nh, int oif) | |
f8efb73c RP |
529 | { |
530 | struct net_device *dev = NULL; | |
531 | int err = -ENODEV; | |
532 | ||
cf4b24f0 | 533 | dev = find_outdev(net, rt, nh, oif); |
f8efb73c RP |
534 | if (IS_ERR(dev)) { |
535 | err = PTR_ERR(dev); | |
536 | dev = NULL; | |
537 | goto errout; | |
538 | } | |
539 | ||
540 | /* Ensure this is a supported device */ | |
541 | err = -EINVAL; | |
542 | if (!mpls_dev_get(dev)) | |
543 | goto errout; | |
544 | ||
a3e948e8 RS |
545 | if ((nh->nh_via_table == NEIGH_LINK_TABLE) && |
546 | (dev->addr_len != nh->nh_via_alen)) | |
547 | goto errout; | |
548 | ||
f8efb73c RP |
549 | RCU_INIT_POINTER(nh->nh_dev, dev); |
550 | ||
551 | return 0; | |
552 | ||
553 | errout: | |
554 | return err; | |
555 | } | |
556 | ||
557 | static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, | |
558 | struct mpls_route *rt) | |
559 | { | |
560 | struct net *net = cfg->rc_nlinfo.nl_net; | |
561 | struct mpls_nh *nh = rt->rt_nh; | |
562 | int err; | |
563 | int i; | |
564 | ||
565 | if (!nh) | |
566 | return -ENOMEM; | |
567 | ||
568 | err = -EINVAL; | |
569 | /* Ensure only a supported number of labels are present */ | |
570 | if (cfg->rc_output_labels > MAX_NEW_LABELS) | |
571 | goto errout; | |
572 | ||
573 | nh->nh_labels = cfg->rc_output_labels; | |
574 | for (i = 0; i < nh->nh_labels; i++) | |
575 | nh->nh_label[i] = cfg->rc_output_label[i]; | |
576 | ||
577 | nh->nh_via_table = cfg->rc_via_table; | |
cf4b24f0 | 578 | memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); |
f8efb73c RP |
579 | nh->nh_via_alen = cfg->rc_via_alen; |
580 | ||
cf4b24f0 | 581 | err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); |
f8efb73c RP |
582 | if (err) |
583 | goto errout; | |
584 | ||
585 | return 0; | |
586 | ||
587 | errout: | |
588 | return err; | |
589 | } | |
590 | ||
cf4b24f0 RS |
591 | static int mpls_nh_build(struct net *net, struct mpls_route *rt, |
592 | struct mpls_nh *nh, int oif, | |
593 | struct nlattr *via, struct nlattr *newdst) | |
f8efb73c RP |
594 | { |
595 | int err = -ENOMEM; | |
596 | ||
597 | if (!nh) | |
598 | goto errout; | |
599 | ||
600 | if (newdst) { | |
601 | err = nla_get_labels(newdst, MAX_NEW_LABELS, | |
602 | &nh->nh_labels, nh->nh_label); | |
603 | if (err) | |
604 | goto errout; | |
605 | } | |
606 | ||
607 | err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, | |
cf4b24f0 | 608 | __mpls_nh_via(rt, nh)); |
f8efb73c RP |
609 | if (err) |
610 | goto errout; | |
611 | ||
cf4b24f0 | 612 | err = mpls_nh_assign_dev(net, rt, nh, oif); |
f8efb73c RP |
613 | if (err) |
614 | goto errout; | |
615 | ||
616 | return 0; | |
617 | ||
618 | errout: | |
619 | return err; | |
620 | } | |
621 | ||
cf4b24f0 RS |
622 | static int mpls_count_nexthops(struct rtnexthop *rtnh, int len, |
623 | u8 cfg_via_alen, u8 *max_via_alen) | |
f8efb73c RP |
624 | { |
625 | int nhs = 0; | |
626 | int remaining = len; | |
627 | ||
cf4b24f0 RS |
628 | if (!rtnh) { |
629 | *max_via_alen = cfg_via_alen; | |
630 | return 1; | |
631 | } | |
632 | ||
633 | *max_via_alen = 0; | |
634 | ||
f8efb73c | 635 | while (rtnh_ok(rtnh, remaining)) { |
cf4b24f0 RS |
636 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
637 | int attrlen; | |
638 | ||
639 | attrlen = rtnh_attrlen(rtnh); | |
640 | nla = nla_find(attrs, attrlen, RTA_VIA); | |
641 | if (nla && nla_len(nla) >= | |
642 | offsetof(struct rtvia, rtvia_addr)) { | |
643 | int via_alen = nla_len(nla) - | |
644 | offsetof(struct rtvia, rtvia_addr); | |
645 | ||
646 | if (via_alen <= MAX_VIA_ALEN) | |
647 | *max_via_alen = max_t(u16, *max_via_alen, | |
648 | via_alen); | |
649 | } | |
650 | ||
f8efb73c RP |
651 | nhs++; |
652 | rtnh = rtnh_next(rtnh, &remaining); | |
653 | } | |
654 | ||
655 | /* leftover implies invalid nexthop configuration, discard it */ | |
656 | return remaining > 0 ? 0 : nhs; | |
657 | } | |
658 | ||
659 | static int mpls_nh_build_multi(struct mpls_route_config *cfg, | |
660 | struct mpls_route *rt) | |
661 | { | |
662 | struct rtnexthop *rtnh = cfg->rc_mp; | |
663 | struct nlattr *nla_via, *nla_newdst; | |
664 | int remaining = cfg->rc_mp_len; | |
665 | int nhs = 0; | |
666 | int err = 0; | |
667 | ||
668 | change_nexthops(rt) { | |
669 | int attrlen; | |
670 | ||
671 | nla_via = NULL; | |
672 | nla_newdst = NULL; | |
673 | ||
674 | err = -EINVAL; | |
675 | if (!rtnh_ok(rtnh, remaining)) | |
676 | goto errout; | |
677 | ||
1c78efa8 RS |
678 | /* neither weighted multipath nor any flags |
679 | * are supported | |
680 | */ | |
681 | if (rtnh->rtnh_hops || rtnh->rtnh_flags) | |
682 | goto errout; | |
683 | ||
f8efb73c RP |
684 | attrlen = rtnh_attrlen(rtnh); |
685 | if (attrlen > 0) { | |
686 | struct nlattr *attrs = rtnh_attrs(rtnh); | |
687 | ||
688 | nla_via = nla_find(attrs, attrlen, RTA_VIA); | |
689 | nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); | |
690 | } | |
691 | ||
692 | if (!nla_via) | |
693 | goto errout; | |
694 | ||
cf4b24f0 | 695 | err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, |
f8efb73c RP |
696 | rtnh->rtnh_ifindex, nla_via, |
697 | nla_newdst); | |
698 | if (err) | |
699 | goto errout; | |
700 | ||
701 | rtnh = rtnh_next(rtnh, &remaining); | |
702 | nhs++; | |
703 | } endfor_nexthops(rt); | |
704 | ||
705 | rt->rt_nhn = nhs; | |
706 | ||
707 | return 0; | |
708 | ||
709 | errout: | |
710 | return err; | |
711 | } | |
712 | ||
a2519929 EB |
713 | static int mpls_route_add(struct mpls_route_config *cfg) |
714 | { | |
19d0c341 | 715 | struct mpls_route __rcu **platform_label; |
a2519929 | 716 | struct net *net = cfg->rc_nlinfo.nl_net; |
a2519929 | 717 | struct mpls_route *rt, *old; |
a2519929 | 718 | int err = -EINVAL; |
cf4b24f0 | 719 | u8 max_via_alen; |
f8efb73c | 720 | unsigned index; |
cf4b24f0 | 721 | int nhs; |
a2519929 EB |
722 | |
723 | index = cfg->rc_label; | |
724 | ||
725 | /* If a label was not specified during insert pick one */ | |
726 | if ((index == LABEL_NOT_SPECIFIED) && | |
727 | (cfg->rc_nlflags & NLM_F_CREATE)) { | |
728 | index = find_free_label(net); | |
729 | } | |
730 | ||
a6affd24 RS |
731 | /* Reserved labels may not be set */ |
732 | if (index < MPLS_LABEL_FIRST_UNRESERVED) | |
a2519929 EB |
733 | goto errout; |
734 | ||
735 | /* The full 20 bit range may not be supported. */ | |
736 | if (index >= net->mpls.platform_labels) | |
737 | goto errout; | |
738 | ||
a2519929 | 739 | /* Append makes no sense with mpls */ |
0f7bbd58 | 740 | err = -EOPNOTSUPP; |
a2519929 EB |
741 | if (cfg->rc_nlflags & NLM_F_APPEND) |
742 | goto errout; | |
743 | ||
744 | err = -EEXIST; | |
19d0c341 EB |
745 | platform_label = rtnl_dereference(net->mpls.platform_label); |
746 | old = rtnl_dereference(platform_label[index]); | |
a2519929 EB |
747 | if ((cfg->rc_nlflags & NLM_F_EXCL) && old) |
748 | goto errout; | |
749 | ||
750 | err = -EEXIST; | |
751 | if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) | |
752 | goto errout; | |
753 | ||
754 | err = -ENOENT; | |
755 | if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) | |
756 | goto errout; | |
757 | ||
cf4b24f0 RS |
758 | err = -EINVAL; |
759 | nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, | |
760 | cfg->rc_via_alen, &max_via_alen); | |
761 | if (nhs == 0) | |
762 | goto errout; | |
f8efb73c | 763 | |
a2519929 | 764 | err = -ENOMEM; |
cf4b24f0 | 765 | rt = mpls_rt_alloc(nhs, max_via_alen); |
a2519929 EB |
766 | if (!rt) |
767 | goto errout; | |
768 | ||
a2519929 | 769 | rt->rt_protocol = cfg->rc_protocol; |
118d5234 | 770 | rt->rt_payload_type = cfg->rc_payload_type; |
a2519929 | 771 | |
f8efb73c RP |
772 | if (cfg->rc_mp) |
773 | err = mpls_nh_build_multi(cfg, rt); | |
774 | else | |
775 | err = mpls_nh_build_from_cfg(cfg, rt); | |
776 | if (err) | |
777 | goto freert; | |
778 | ||
779 | mpls_route_update(net, index, rt, &cfg->rc_nlinfo); | |
a2519929 | 780 | |
a2519929 EB |
781 | return 0; |
782 | ||
f8efb73c RP |
783 | freert: |
784 | mpls_rt_free(rt); | |
a2519929 | 785 | errout: |
a2519929 EB |
786 | return err; |
787 | } | |
788 | ||
789 | static int mpls_route_del(struct mpls_route_config *cfg) | |
790 | { | |
791 | struct net *net = cfg->rc_nlinfo.nl_net; | |
792 | unsigned index; | |
793 | int err = -EINVAL; | |
794 | ||
795 | index = cfg->rc_label; | |
796 | ||
a6affd24 RS |
797 | /* Reserved labels may not be removed */ |
798 | if (index < MPLS_LABEL_FIRST_UNRESERVED) | |
a2519929 EB |
799 | goto errout; |
800 | ||
801 | /* The full 20 bit range may not be supported */ | |
802 | if (index >= net->mpls.platform_labels) | |
803 | goto errout; | |
804 | ||
f8efb73c | 805 | mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); |
a2519929 EB |
806 | |
807 | err = 0; | |
808 | errout: | |
809 | return err; | |
810 | } | |
811 | ||
37bde799 RS |
812 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
813 | (&((struct mpls_dev *)0)->field) | |
814 | ||
815 | static const struct ctl_table mpls_dev_table[] = { | |
816 | { | |
817 | .procname = "input", | |
818 | .maxlen = sizeof(int), | |
819 | .mode = 0644, | |
820 | .proc_handler = proc_dointvec, | |
821 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), | |
822 | }, | |
823 | { } | |
824 | }; | |
825 | ||
826 | static int mpls_dev_sysctl_register(struct net_device *dev, | |
827 | struct mpls_dev *mdev) | |
828 | { | |
829 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; | |
830 | struct ctl_table *table; | |
831 | int i; | |
832 | ||
833 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); | |
834 | if (!table) | |
835 | goto out; | |
836 | ||
837 | /* Table data contains only offsets relative to the base of | |
838 | * the mdev at this point, so make them absolute. | |
839 | */ | |
840 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) | |
841 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; | |
842 | ||
843 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); | |
844 | ||
845 | mdev->sysctl = register_net_sysctl(dev_net(dev), path, table); | |
846 | if (!mdev->sysctl) | |
847 | goto free; | |
848 | ||
849 | return 0; | |
850 | ||
851 | free: | |
852 | kfree(table); | |
853 | out: | |
854 | return -ENOBUFS; | |
855 | } | |
856 | ||
857 | static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev) | |
858 | { | |
859 | struct ctl_table *table; | |
860 | ||
861 | table = mdev->sysctl->ctl_table_arg; | |
862 | unregister_net_sysctl_table(mdev->sysctl); | |
863 | kfree(table); | |
864 | } | |
865 | ||
03c57747 RS |
866 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
867 | { | |
868 | struct mpls_dev *mdev; | |
869 | int err = -ENOMEM; | |
870 | ||
871 | ASSERT_RTNL(); | |
872 | ||
873 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); | |
874 | if (!mdev) | |
875 | return ERR_PTR(err); | |
876 | ||
37bde799 RS |
877 | err = mpls_dev_sysctl_register(dev, mdev); |
878 | if (err) | |
879 | goto free; | |
880 | ||
03c57747 RS |
881 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
882 | ||
883 | return mdev; | |
37bde799 RS |
884 | |
885 | free: | |
886 | kfree(mdev); | |
887 | return ERR_PTR(err); | |
03c57747 RS |
888 | } |
889 | ||
0189197f EB |
890 | static void mpls_ifdown(struct net_device *dev) |
891 | { | |
19d0c341 | 892 | struct mpls_route __rcu **platform_label; |
0189197f | 893 | struct net *net = dev_net(dev); |
03c57747 | 894 | struct mpls_dev *mdev; |
0189197f EB |
895 | unsigned index; |
896 | ||
19d0c341 | 897 | platform_label = rtnl_dereference(net->mpls.platform_label); |
0189197f | 898 | for (index = 0; index < net->mpls.platform_labels; index++) { |
19d0c341 | 899 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
0189197f EB |
900 | if (!rt) |
901 | continue; | |
f8efb73c RP |
902 | for_nexthops(rt) { |
903 | if (rtnl_dereference(nh->nh_dev) != dev) | |
904 | continue; | |
905 | nh->nh_dev = NULL; | |
906 | } endfor_nexthops(rt); | |
0189197f | 907 | } |
03c57747 RS |
908 | |
909 | mdev = mpls_dev_get(dev); | |
910 | if (!mdev) | |
911 | return; | |
912 | ||
37bde799 RS |
913 | mpls_dev_sysctl_unregister(mdev); |
914 | ||
03c57747 RS |
915 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); |
916 | ||
25cc8f07 | 917 | kfree_rcu(mdev, rcu); |
0189197f EB |
918 | } |
919 | ||
920 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, | |
921 | void *ptr) | |
922 | { | |
923 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
03c57747 | 924 | struct mpls_dev *mdev; |
0189197f EB |
925 | |
926 | switch(event) { | |
03c57747 RS |
927 | case NETDEV_REGISTER: |
928 | /* For now just support ethernet devices */ | |
929 | if ((dev->type == ARPHRD_ETHER) || | |
930 | (dev->type == ARPHRD_LOOPBACK)) { | |
931 | mdev = mpls_add_dev(dev); | |
932 | if (IS_ERR(mdev)) | |
933 | return notifier_from_errno(PTR_ERR(mdev)); | |
934 | } | |
935 | break; | |
936 | ||
0189197f EB |
937 | case NETDEV_UNREGISTER: |
938 | mpls_ifdown(dev); | |
939 | break; | |
0fae3bf0 RS |
940 | case NETDEV_CHANGENAME: |
941 | mdev = mpls_dev_get(dev); | |
942 | if (mdev) { | |
943 | int err; | |
944 | ||
945 | mpls_dev_sysctl_unregister(mdev); | |
946 | err = mpls_dev_sysctl_register(dev, mdev); | |
947 | if (err) | |
948 | return notifier_from_errno(err); | |
949 | } | |
950 | break; | |
0189197f EB |
951 | } |
952 | return NOTIFY_OK; | |
953 | } | |
954 | ||
955 | static struct notifier_block mpls_dev_notifier = { | |
956 | .notifier_call = mpls_dev_notify, | |
957 | }; | |
958 | ||
03c05665 | 959 | static int nla_put_via(struct sk_buff *skb, |
b79bda3d | 960 | u8 table, const void *addr, int alen) |
03c05665 | 961 | { |
b79bda3d EB |
962 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
963 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, | |
964 | }; | |
03c05665 EB |
965 | struct nlattr *nla; |
966 | struct rtvia *via; | |
b79bda3d | 967 | int family = AF_UNSPEC; |
03c05665 EB |
968 | |
969 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
970 | if (!nla) | |
971 | return -EMSGSIZE; | |
972 | ||
b79bda3d EB |
973 | if (table <= NEIGH_NR_TABLES) |
974 | family = table_to_family[table]; | |
975 | ||
03c05665 EB |
976 | via = nla_data(nla); |
977 | via->rtvia_family = family; | |
978 | memcpy(via->rtvia_addr, addr, alen); | |
979 | return 0; | |
980 | } | |
981 | ||
966bae33 EB |
982 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
983 | u8 labels, const u32 label[]) | |
984 | { | |
985 | struct nlattr *nla; | |
986 | struct mpls_shim_hdr *nla_label; | |
987 | bool bos; | |
988 | int i; | |
989 | nla = nla_reserve(skb, attrtype, labels*4); | |
990 | if (!nla) | |
991 | return -EMSGSIZE; | |
992 | ||
993 | nla_label = nla_data(nla); | |
994 | bos = true; | |
995 | for (i = labels - 1; i >= 0; i--) { | |
996 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); | |
997 | bos = false; | |
998 | } | |
999 | ||
1000 | return 0; | |
1001 | } | |
face0188 | 1002 | EXPORT_SYMBOL_GPL(nla_put_labels); |
966bae33 EB |
1003 | |
1004 | int nla_get_labels(const struct nlattr *nla, | |
f8efb73c | 1005 | u32 max_labels, u8 *labels, u32 label[]) |
966bae33 EB |
1006 | { |
1007 | unsigned len = nla_len(nla); | |
1008 | unsigned nla_labels; | |
1009 | struct mpls_shim_hdr *nla_label; | |
1010 | bool bos; | |
1011 | int i; | |
1012 | ||
1013 | /* len needs to be an even multiple of 4 (the label size) */ | |
1014 | if (len & 3) | |
1015 | return -EINVAL; | |
1016 | ||
1017 | /* Limit the number of new labels allowed */ | |
1018 | nla_labels = len/4; | |
1019 | if (nla_labels > max_labels) | |
1020 | return -EINVAL; | |
1021 | ||
1022 | nla_label = nla_data(nla); | |
1023 | bos = true; | |
1024 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { | |
1025 | struct mpls_entry_decoded dec; | |
1026 | dec = mpls_entry_decode(nla_label + i); | |
1027 | ||
1028 | /* Ensure the bottom of stack flag is properly set | |
1029 | * and ttl and tc are both clear. | |
1030 | */ | |
1031 | if ((dec.bos != bos) || dec.ttl || dec.tc) | |
1032 | return -EINVAL; | |
1033 | ||
5a9ab017 | 1034 | switch (dec.label) { |
78f5b899 | 1035 | case MPLS_LABEL_IMPLNULL: |
5a9ab017 RS |
1036 | /* RFC3032: This is a label that an LSR may |
1037 | * assign and distribute, but which never | |
1038 | * actually appears in the encapsulation. | |
1039 | */ | |
1040 | return -EINVAL; | |
1041 | } | |
1042 | ||
966bae33 EB |
1043 | label[i] = dec.label; |
1044 | } | |
1045 | *labels = nla_labels; | |
1046 | return 0; | |
1047 | } | |
face0188 | 1048 | EXPORT_SYMBOL_GPL(nla_get_labels); |
966bae33 | 1049 | |
f8efb73c RP |
1050 | int nla_get_via(const struct nlattr *nla, u8 *via_alen, |
1051 | u8 *via_table, u8 via_addr[]) | |
1052 | { | |
1053 | struct rtvia *via = nla_data(nla); | |
1054 | int err = -EINVAL; | |
1055 | int alen; | |
1056 | ||
1057 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) | |
1058 | goto errout; | |
1059 | alen = nla_len(nla) - | |
1060 | offsetof(struct rtvia, rtvia_addr); | |
1061 | if (alen > MAX_VIA_ALEN) | |
1062 | goto errout; | |
1063 | ||
1064 | /* Validate the address family */ | |
1065 | switch (via->rtvia_family) { | |
1066 | case AF_PACKET: | |
1067 | *via_table = NEIGH_LINK_TABLE; | |
1068 | break; | |
1069 | case AF_INET: | |
1070 | *via_table = NEIGH_ARP_TABLE; | |
1071 | if (alen != 4) | |
1072 | goto errout; | |
1073 | break; | |
1074 | case AF_INET6: | |
1075 | *via_table = NEIGH_ND_TABLE; | |
1076 | if (alen != 16) | |
1077 | goto errout; | |
1078 | break; | |
1079 | default: | |
1080 | /* Unsupported address family */ | |
1081 | goto errout; | |
1082 | } | |
1083 | ||
1084 | memcpy(via_addr, via->rtvia_addr, alen); | |
1085 | *via_alen = alen; | |
1086 | err = 0; | |
1087 | ||
1088 | errout: | |
1089 | return err; | |
1090 | } | |
1091 | ||
03c05665 EB |
1092 | static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, |
1093 | struct mpls_route_config *cfg) | |
1094 | { | |
1095 | struct rtmsg *rtm; | |
1096 | struct nlattr *tb[RTA_MAX+1]; | |
1097 | int index; | |
1098 | int err; | |
1099 | ||
1100 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy); | |
1101 | if (err < 0) | |
1102 | goto errout; | |
1103 | ||
1104 | err = -EINVAL; | |
1105 | rtm = nlmsg_data(nlh); | |
1106 | memset(cfg, 0, sizeof(*cfg)); | |
1107 | ||
1108 | if (rtm->rtm_family != AF_MPLS) | |
1109 | goto errout; | |
1110 | if (rtm->rtm_dst_len != 20) | |
1111 | goto errout; | |
1112 | if (rtm->rtm_src_len != 0) | |
1113 | goto errout; | |
1114 | if (rtm->rtm_tos != 0) | |
1115 | goto errout; | |
1116 | if (rtm->rtm_table != RT_TABLE_MAIN) | |
1117 | goto errout; | |
1118 | /* Any value is acceptable for rtm_protocol */ | |
1119 | ||
1120 | /* As mpls uses destination specific addresses | |
1121 | * (or source specific address in the case of multicast) | |
1122 | * all addresses have universal scope. | |
1123 | */ | |
1124 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) | |
1125 | goto errout; | |
1126 | if (rtm->rtm_type != RTN_UNICAST) | |
1127 | goto errout; | |
1128 | if (rtm->rtm_flags != 0) | |
1129 | goto errout; | |
1130 | ||
1131 | cfg->rc_label = LABEL_NOT_SPECIFIED; | |
1132 | cfg->rc_protocol = rtm->rtm_protocol; | |
eb7809f0 | 1133 | cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
03c05665 EB |
1134 | cfg->rc_nlflags = nlh->nlmsg_flags; |
1135 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; | |
1136 | cfg->rc_nlinfo.nlh = nlh; | |
1137 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); | |
1138 | ||
1139 | for (index = 0; index <= RTA_MAX; index++) { | |
1140 | struct nlattr *nla = tb[index]; | |
1141 | if (!nla) | |
1142 | continue; | |
1143 | ||
1144 | switch(index) { | |
1145 | case RTA_OIF: | |
1146 | cfg->rc_ifindex = nla_get_u32(nla); | |
1147 | break; | |
1148 | case RTA_NEWDST: | |
1149 | if (nla_get_labels(nla, MAX_NEW_LABELS, | |
1150 | &cfg->rc_output_labels, | |
1151 | cfg->rc_output_label)) | |
1152 | goto errout; | |
1153 | break; | |
1154 | case RTA_DST: | |
1155 | { | |
f8efb73c | 1156 | u8 label_count; |
03c05665 EB |
1157 | if (nla_get_labels(nla, 1, &label_count, |
1158 | &cfg->rc_label)) | |
1159 | goto errout; | |
1160 | ||
a6affd24 RS |
1161 | /* Reserved labels may not be set */ |
1162 | if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) | |
03c05665 EB |
1163 | goto errout; |
1164 | ||
1165 | break; | |
1166 | } | |
1167 | case RTA_VIA: | |
1168 | { | |
f8efb73c RP |
1169 | if (nla_get_via(nla, &cfg->rc_via_alen, |
1170 | &cfg->rc_via_table, cfg->rc_via)) | |
03c05665 | 1171 | goto errout; |
f8efb73c RP |
1172 | break; |
1173 | } | |
1174 | case RTA_MULTIPATH: | |
1175 | { | |
1176 | cfg->rc_mp = nla_data(nla); | |
1177 | cfg->rc_mp_len = nla_len(nla); | |
03c05665 EB |
1178 | break; |
1179 | } | |
1180 | default: | |
1181 | /* Unsupported attribute */ | |
1182 | goto errout; | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | err = 0; | |
1187 | errout: | |
1188 | return err; | |
1189 | } | |
1190 | ||
1191 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1192 | { | |
1193 | struct mpls_route_config cfg; | |
1194 | int err; | |
1195 | ||
1196 | err = rtm_to_route_config(skb, nlh, &cfg); | |
1197 | if (err < 0) | |
1198 | return err; | |
1199 | ||
1200 | return mpls_route_del(&cfg); | |
1201 | } | |
1202 | ||
1203 | ||
1204 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1205 | { | |
1206 | struct mpls_route_config cfg; | |
1207 | int err; | |
1208 | ||
1209 | err = rtm_to_route_config(skb, nlh, &cfg); | |
1210 | if (err < 0) | |
1211 | return err; | |
1212 | ||
1213 | return mpls_route_add(&cfg); | |
1214 | } | |
1215 | ||
1216 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, | |
1217 | u32 label, struct mpls_route *rt, int flags) | |
1218 | { | |
19d0c341 | 1219 | struct net_device *dev; |
03c05665 EB |
1220 | struct nlmsghdr *nlh; |
1221 | struct rtmsg *rtm; | |
1222 | ||
1223 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); | |
1224 | if (nlh == NULL) | |
1225 | return -EMSGSIZE; | |
1226 | ||
1227 | rtm = nlmsg_data(nlh); | |
1228 | rtm->rtm_family = AF_MPLS; | |
1229 | rtm->rtm_dst_len = 20; | |
1230 | rtm->rtm_src_len = 0; | |
1231 | rtm->rtm_tos = 0; | |
1232 | rtm->rtm_table = RT_TABLE_MAIN; | |
1233 | rtm->rtm_protocol = rt->rt_protocol; | |
1234 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1235 | rtm->rtm_type = RTN_UNICAST; | |
1236 | rtm->rtm_flags = 0; | |
1237 | ||
03c05665 EB |
1238 | if (nla_put_labels(skb, RTA_DST, 1, &label)) |
1239 | goto nla_put_failure; | |
f8efb73c | 1240 | if (rt->rt_nhn == 1) { |
cf4b24f0 | 1241 | const struct mpls_nh *nh = rt->rt_nh; |
f8efb73c RP |
1242 | |
1243 | if (nh->nh_labels && | |
1244 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
1245 | nh->nh_label)) | |
1246 | goto nla_put_failure; | |
eb7809f0 | 1247 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
72dcac96 | 1248 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
f8efb73c RP |
1249 | nh->nh_via_alen)) |
1250 | goto nla_put_failure; | |
1251 | dev = rtnl_dereference(nh->nh_dev); | |
1252 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
1253 | goto nla_put_failure; | |
1254 | } else { | |
1255 | struct rtnexthop *rtnh; | |
1256 | struct nlattr *mp; | |
1257 | ||
1258 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
1259 | if (!mp) | |
1260 | goto nla_put_failure; | |
1261 | ||
1262 | for_nexthops(rt) { | |
1263 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
1264 | if (!rtnh) | |
1265 | goto nla_put_failure; | |
1266 | ||
1267 | dev = rtnl_dereference(nh->nh_dev); | |
1268 | if (dev) | |
1269 | rtnh->rtnh_ifindex = dev->ifindex; | |
1270 | if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, | |
1271 | nh->nh_labels, | |
1272 | nh->nh_label)) | |
1273 | goto nla_put_failure; | |
1274 | if (nla_put_via(skb, nh->nh_via_table, | |
cf4b24f0 | 1275 | mpls_nh_via(rt, nh), |
f8efb73c RP |
1276 | nh->nh_via_alen)) |
1277 | goto nla_put_failure; | |
1278 | ||
1279 | /* length of rtnetlink header + attributes */ | |
1280 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
1281 | } endfor_nexthops(rt); | |
1282 | ||
1283 | nla_nest_end(skb, mp); | |
1284 | } | |
03c05665 EB |
1285 | |
1286 | nlmsg_end(skb, nlh); | |
1287 | return 0; | |
1288 | ||
1289 | nla_put_failure: | |
1290 | nlmsg_cancel(skb, nlh); | |
1291 | return -EMSGSIZE; | |
1292 | } | |
1293 | ||
1294 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) | |
1295 | { | |
1296 | struct net *net = sock_net(skb->sk); | |
19d0c341 EB |
1297 | struct mpls_route __rcu **platform_label; |
1298 | size_t platform_labels; | |
03c05665 EB |
1299 | unsigned int index; |
1300 | ||
1301 | ASSERT_RTNL(); | |
1302 | ||
1303 | index = cb->args[0]; | |
a6affd24 RS |
1304 | if (index < MPLS_LABEL_FIRST_UNRESERVED) |
1305 | index = MPLS_LABEL_FIRST_UNRESERVED; | |
03c05665 | 1306 | |
19d0c341 EB |
1307 | platform_label = rtnl_dereference(net->mpls.platform_label); |
1308 | platform_labels = net->mpls.platform_labels; | |
1309 | for (; index < platform_labels; index++) { | |
03c05665 | 1310 | struct mpls_route *rt; |
19d0c341 | 1311 | rt = rtnl_dereference(platform_label[index]); |
03c05665 EB |
1312 | if (!rt) |
1313 | continue; | |
1314 | ||
1315 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, | |
1316 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, | |
1317 | index, rt, NLM_F_MULTI) < 0) | |
1318 | break; | |
1319 | } | |
1320 | cb->args[0] = index; | |
1321 | ||
1322 | return skb->len; | |
1323 | } | |
1324 | ||
8de147dc EB |
1325 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
1326 | { | |
1327 | size_t payload = | |
1328 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
8de147dc | 1329 | + nla_total_size(4); /* RTA_DST */ |
f8efb73c RP |
1330 | |
1331 | if (rt->rt_nhn == 1) { | |
1332 | struct mpls_nh *nh = rt->rt_nh; | |
1333 | ||
1334 | if (nh->nh_dev) | |
1335 | payload += nla_total_size(4); /* RTA_OIF */ | |
eb7809f0 | 1336 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ |
72dcac96 | 1337 | payload += nla_total_size(2 + nh->nh_via_alen); |
f8efb73c RP |
1338 | if (nh->nh_labels) /* RTA_NEWDST */ |
1339 | payload += nla_total_size(nh->nh_labels * 4); | |
1340 | } else { | |
1341 | /* each nexthop is packed in an attribute */ | |
1342 | size_t nhsize = 0; | |
1343 | ||
1344 | for_nexthops(rt) { | |
1345 | nhsize += nla_total_size(sizeof(struct rtnexthop)); | |
1346 | nhsize += nla_total_size(2 + nh->nh_via_alen); | |
1347 | if (nh->nh_labels) | |
1348 | nhsize += nla_total_size(nh->nh_labels * 4); | |
1349 | } endfor_nexthops(rt); | |
1350 | /* nested attribute */ | |
1351 | payload += nla_total_size(nhsize); | |
1352 | } | |
1353 | ||
8de147dc EB |
1354 | return payload; |
1355 | } | |
1356 | ||
1357 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, | |
1358 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
1359 | unsigned int nlm_flags) | |
1360 | { | |
1361 | struct sk_buff *skb; | |
1362 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
1363 | int err = -ENOBUFS; | |
1364 | ||
1365 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
1366 | if (skb == NULL) | |
1367 | goto errout; | |
1368 | ||
1369 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); | |
1370 | if (err < 0) { | |
1371 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
1372 | WARN_ON(err == -EMSGSIZE); | |
1373 | kfree_skb(skb); | |
1374 | goto errout; | |
1375 | } | |
1376 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); | |
1377 | ||
1378 | return; | |
1379 | errout: | |
1380 | if (err < 0) | |
1381 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); | |
1382 | } | |
1383 | ||
7720c01f EB |
1384 | static int resize_platform_label_table(struct net *net, size_t limit) |
1385 | { | |
1386 | size_t size = sizeof(struct mpls_route *) * limit; | |
1387 | size_t old_limit; | |
1388 | size_t cp_size; | |
1389 | struct mpls_route __rcu **labels = NULL, **old; | |
1390 | struct mpls_route *rt0 = NULL, *rt2 = NULL; | |
1391 | unsigned index; | |
1392 | ||
1393 | if (size) { | |
1394 | labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); | |
1395 | if (!labels) | |
1396 | labels = vzalloc(size); | |
1397 | ||
1398 | if (!labels) | |
1399 | goto nolabels; | |
1400 | } | |
1401 | ||
1402 | /* In case the predefined labels need to be populated */ | |
78f5b899 | 1403 | if (limit > MPLS_LABEL_IPV4NULL) { |
7720c01f | 1404 | struct net_device *lo = net->loopback_dev; |
cf4b24f0 | 1405 | rt0 = mpls_rt_alloc(1, lo->addr_len); |
7720c01f EB |
1406 | if (!rt0) |
1407 | goto nort0; | |
f8efb73c | 1408 | RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); |
7720c01f | 1409 | rt0->rt_protocol = RTPROT_KERNEL; |
118d5234 | 1410 | rt0->rt_payload_type = MPT_IPV4; |
f8efb73c | 1411 | rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 1412 | rt0->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
1413 | memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, |
1414 | lo->addr_len); | |
7720c01f | 1415 | } |
78f5b899 | 1416 | if (limit > MPLS_LABEL_IPV6NULL) { |
7720c01f | 1417 | struct net_device *lo = net->loopback_dev; |
cf4b24f0 | 1418 | rt2 = mpls_rt_alloc(1, lo->addr_len); |
7720c01f EB |
1419 | if (!rt2) |
1420 | goto nort2; | |
f8efb73c | 1421 | RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); |
7720c01f | 1422 | rt2->rt_protocol = RTPROT_KERNEL; |
118d5234 | 1423 | rt2->rt_payload_type = MPT_IPV6; |
f8efb73c | 1424 | rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 1425 | rt2->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
1426 | memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, |
1427 | lo->addr_len); | |
7720c01f EB |
1428 | } |
1429 | ||
1430 | rtnl_lock(); | |
1431 | /* Remember the original table */ | |
19d0c341 | 1432 | old = rtnl_dereference(net->mpls.platform_label); |
7720c01f EB |
1433 | old_limit = net->mpls.platform_labels; |
1434 | ||
1435 | /* Free any labels beyond the new table */ | |
1436 | for (index = limit; index < old_limit; index++) | |
f8efb73c | 1437 | mpls_route_update(net, index, NULL, NULL); |
7720c01f EB |
1438 | |
1439 | /* Copy over the old labels */ | |
1440 | cp_size = size; | |
1441 | if (old_limit < limit) | |
1442 | cp_size = old_limit * sizeof(struct mpls_route *); | |
1443 | ||
1444 | memcpy(labels, old, cp_size); | |
1445 | ||
1446 | /* If needed set the predefined labels */ | |
78f5b899 TH |
1447 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
1448 | (limit > MPLS_LABEL_IPV6NULL)) { | |
1449 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); | |
7720c01f EB |
1450 | rt2 = NULL; |
1451 | } | |
1452 | ||
78f5b899 TH |
1453 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
1454 | (limit > MPLS_LABEL_IPV4NULL)) { | |
1455 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); | |
7720c01f EB |
1456 | rt0 = NULL; |
1457 | } | |
1458 | ||
1459 | /* Update the global pointers */ | |
1460 | net->mpls.platform_labels = limit; | |
19d0c341 | 1461 | rcu_assign_pointer(net->mpls.platform_label, labels); |
7720c01f EB |
1462 | |
1463 | rtnl_unlock(); | |
1464 | ||
1465 | mpls_rt_free(rt2); | |
1466 | mpls_rt_free(rt0); | |
1467 | ||
1468 | if (old) { | |
1469 | synchronize_rcu(); | |
1470 | kvfree(old); | |
1471 | } | |
1472 | return 0; | |
1473 | ||
1474 | nort2: | |
1475 | mpls_rt_free(rt0); | |
1476 | nort0: | |
1477 | kvfree(labels); | |
1478 | nolabels: | |
1479 | return -ENOMEM; | |
1480 | } | |
1481 | ||
1482 | static int mpls_platform_labels(struct ctl_table *table, int write, | |
1483 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1484 | { | |
1485 | struct net *net = table->data; | |
1486 | int platform_labels = net->mpls.platform_labels; | |
1487 | int ret; | |
1488 | struct ctl_table tmp = { | |
1489 | .procname = table->procname, | |
1490 | .data = &platform_labels, | |
1491 | .maxlen = sizeof(int), | |
1492 | .mode = table->mode, | |
1493 | .extra1 = &zero, | |
1494 | .extra2 = &label_limit, | |
1495 | }; | |
1496 | ||
1497 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1498 | ||
1499 | if (write && ret == 0) | |
1500 | ret = resize_platform_label_table(net, platform_labels); | |
1501 | ||
1502 | return ret; | |
1503 | } | |
1504 | ||
37bde799 | 1505 | static const struct ctl_table mpls_table[] = { |
7720c01f EB |
1506 | { |
1507 | .procname = "platform_labels", | |
1508 | .data = NULL, | |
1509 | .maxlen = sizeof(int), | |
1510 | .mode = 0644, | |
1511 | .proc_handler = mpls_platform_labels, | |
1512 | }, | |
1513 | { } | |
1514 | }; | |
1515 | ||
0189197f EB |
1516 | static int mpls_net_init(struct net *net) |
1517 | { | |
7720c01f EB |
1518 | struct ctl_table *table; |
1519 | ||
0189197f EB |
1520 | net->mpls.platform_labels = 0; |
1521 | net->mpls.platform_label = NULL; | |
1522 | ||
7720c01f EB |
1523 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
1524 | if (table == NULL) | |
1525 | return -ENOMEM; | |
1526 | ||
1527 | table[0].data = net; | |
1528 | net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); | |
6ea3c9d5 NA |
1529 | if (net->mpls.ctl == NULL) { |
1530 | kfree(table); | |
7720c01f | 1531 | return -ENOMEM; |
6ea3c9d5 | 1532 | } |
7720c01f | 1533 | |
0189197f EB |
1534 | return 0; |
1535 | } | |
1536 | ||
1537 | static void mpls_net_exit(struct net *net) | |
1538 | { | |
19d0c341 EB |
1539 | struct mpls_route __rcu **platform_label; |
1540 | size_t platform_labels; | |
7720c01f | 1541 | struct ctl_table *table; |
0189197f EB |
1542 | unsigned int index; |
1543 | ||
7720c01f EB |
1544 | table = net->mpls.ctl->ctl_table_arg; |
1545 | unregister_net_sysctl_table(net->mpls.ctl); | |
1546 | kfree(table); | |
1547 | ||
19d0c341 EB |
1548 | /* An rcu grace period has passed since there was a device in |
1549 | * the network namespace (and thus the last in flight packet) | |
0189197f EB |
1550 | * left this network namespace. This is because |
1551 | * unregister_netdevice_many and netdev_run_todo has completed | |
1552 | * for each network device that was in this network namespace. | |
1553 | * | |
1554 | * As such no additional rcu synchronization is necessary when | |
1555 | * freeing the platform_label table. | |
1556 | */ | |
1557 | rtnl_lock(); | |
19d0c341 EB |
1558 | platform_label = rtnl_dereference(net->mpls.platform_label); |
1559 | platform_labels = net->mpls.platform_labels; | |
1560 | for (index = 0; index < platform_labels; index++) { | |
1561 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
1562 | RCU_INIT_POINTER(platform_label[index], NULL); | |
0189197f EB |
1563 | mpls_rt_free(rt); |
1564 | } | |
1565 | rtnl_unlock(); | |
1566 | ||
19d0c341 | 1567 | kvfree(platform_label); |
0189197f EB |
1568 | } |
1569 | ||
1570 | static struct pernet_operations mpls_net_ops = { | |
1571 | .init = mpls_net_init, | |
1572 | .exit = mpls_net_exit, | |
1573 | }; | |
1574 | ||
1575 | static int __init mpls_init(void) | |
1576 | { | |
1577 | int err; | |
1578 | ||
1579 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); | |
1580 | ||
1581 | err = register_pernet_subsys(&mpls_net_ops); | |
1582 | if (err) | |
1583 | goto out; | |
1584 | ||
1585 | err = register_netdevice_notifier(&mpls_dev_notifier); | |
1586 | if (err) | |
1587 | goto out_unregister_pernet; | |
1588 | ||
1589 | dev_add_pack(&mpls_packet_type); | |
1590 | ||
03c05665 EB |
1591 | rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); |
1592 | rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); | |
1593 | rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); | |
0189197f EB |
1594 | err = 0; |
1595 | out: | |
1596 | return err; | |
1597 | ||
1598 | out_unregister_pernet: | |
1599 | unregister_pernet_subsys(&mpls_net_ops); | |
1600 | goto out; | |
1601 | } | |
1602 | module_init(mpls_init); | |
1603 | ||
1604 | static void __exit mpls_exit(void) | |
1605 | { | |
03c05665 | 1606 | rtnl_unregister_all(PF_MPLS); |
0189197f EB |
1607 | dev_remove_pack(&mpls_packet_type); |
1608 | unregister_netdevice_notifier(&mpls_dev_notifier); | |
1609 | unregister_pernet_subsys(&mpls_net_ops); | |
1610 | } | |
1611 | module_exit(mpls_exit); | |
1612 | ||
1613 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); | |
1614 | MODULE_LICENSE("GPL v2"); | |
1615 | MODULE_ALIAS_NETPROTO(PF_MPLS); |