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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> | |
01faef2c | 18 | #include <net/ip6_route.h> |
0189197f EB |
19 | #include "internal.h" |
20 | ||
a2519929 | 21 | #define LABEL_NOT_SPECIFIED (1<<20) |
0189197f EB |
22 | #define MAX_NEW_LABELS 2 |
23 | ||
24 | /* This maximum ha length copied from the definition of struct neighbour */ | |
25 | #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))) | |
26 | ||
27 | struct mpls_route { /* next hop label forwarding entry */ | |
19d0c341 | 28 | struct net_device __rcu *rt_dev; |
0189197f EB |
29 | struct rcu_head rt_rcu; |
30 | u32 rt_label[MAX_NEW_LABELS]; | |
31 | u8 rt_protocol; /* routing protocol that set this entry */ | |
b79bda3d EB |
32 | u8 rt_labels; |
33 | u8 rt_via_alen; | |
34 | u8 rt_via_table; | |
0189197f EB |
35 | u8 rt_via[0]; |
36 | }; | |
37 | ||
7720c01f EB |
38 | static int zero = 0; |
39 | static int label_limit = (1 << 20) - 1; | |
40 | ||
8de147dc EB |
41 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, |
42 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
43 | unsigned int nlm_flags); | |
44 | ||
0189197f EB |
45 | static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) |
46 | { | |
47 | struct mpls_route *rt = NULL; | |
48 | ||
49 | if (index < net->mpls.platform_labels) { | |
50 | struct mpls_route __rcu **platform_label = | |
51 | rcu_dereference(net->mpls.platform_label); | |
52 | rt = rcu_dereference(platform_label[index]); | |
53 | } | |
54 | return rt; | |
55 | } | |
56 | ||
03c57747 RS |
57 | static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) |
58 | { | |
59 | return rcu_dereference_rtnl(dev->mpls_ptr); | |
60 | } | |
61 | ||
face0188 | 62 | bool mpls_output_possible(const struct net_device *dev) |
0189197f EB |
63 | { |
64 | return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); | |
65 | } | |
face0188 | 66 | EXPORT_SYMBOL_GPL(mpls_output_possible); |
0189197f EB |
67 | |
68 | static unsigned int mpls_rt_header_size(const struct mpls_route *rt) | |
69 | { | |
70 | /* The size of the layer 2.5 labels to be added for this route */ | |
71 | return rt->rt_labels * sizeof(struct mpls_shim_hdr); | |
72 | } | |
73 | ||
face0188 | 74 | unsigned int mpls_dev_mtu(const struct net_device *dev) |
0189197f EB |
75 | { |
76 | /* The amount of data the layer 2 frame can hold */ | |
77 | return dev->mtu; | |
78 | } | |
face0188 | 79 | EXPORT_SYMBOL_GPL(mpls_dev_mtu); |
0189197f | 80 | |
face0188 | 81 | bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
0189197f EB |
82 | { |
83 | if (skb->len <= mtu) | |
84 | return false; | |
85 | ||
86 | if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu) | |
87 | return false; | |
88 | ||
89 | return true; | |
90 | } | |
face0188 | 91 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
0189197f EB |
92 | |
93 | static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb, | |
94 | struct mpls_entry_decoded dec) | |
95 | { | |
96 | /* RFC4385 and RFC5586 encode other packets in mpls such that | |
97 | * they don't conflict with the ip version number, making | |
98 | * decoding by examining the ip version correct in everything | |
99 | * except for the strangest cases. | |
100 | * | |
101 | * The strange cases if we choose to support them will require | |
102 | * manual configuration. | |
103 | */ | |
76fecd82 | 104 | struct iphdr *hdr4; |
0189197f EB |
105 | bool success = true; |
106 | ||
76fecd82 EB |
107 | /* The IPv4 code below accesses through the IPv4 header |
108 | * checksum, which is 12 bytes into the packet. | |
109 | * The IPv6 code below accesses through the IPv6 hop limit | |
110 | * which is 8 bytes into the packet. | |
111 | * | |
112 | * For all supported cases there should always be at least 12 | |
113 | * bytes of packet data present. The IPv4 header is 20 bytes | |
114 | * without options and the IPv6 header is always 40 bytes | |
115 | * long. | |
116 | */ | |
117 | if (!pskb_may_pull(skb, 12)) | |
118 | return false; | |
119 | ||
120 | /* Use ip_hdr to find the ip protocol version */ | |
121 | hdr4 = ip_hdr(skb); | |
0189197f EB |
122 | if (hdr4->version == 4) { |
123 | skb->protocol = htons(ETH_P_IP); | |
124 | csum_replace2(&hdr4->check, | |
125 | htons(hdr4->ttl << 8), | |
126 | htons(dec.ttl << 8)); | |
127 | hdr4->ttl = dec.ttl; | |
128 | } | |
129 | else if (hdr4->version == 6) { | |
130 | struct ipv6hdr *hdr6 = ipv6_hdr(skb); | |
131 | skb->protocol = htons(ETH_P_IPV6); | |
132 | hdr6->hop_limit = dec.ttl; | |
133 | } | |
134 | else | |
135 | /* version 0 and version 1 are used by pseudo wires */ | |
136 | success = false; | |
137 | return success; | |
138 | } | |
139 | ||
140 | static int mpls_forward(struct sk_buff *skb, struct net_device *dev, | |
141 | struct packet_type *pt, struct net_device *orig_dev) | |
142 | { | |
143 | struct net *net = dev_net(dev); | |
144 | struct mpls_shim_hdr *hdr; | |
145 | struct mpls_route *rt; | |
146 | struct mpls_entry_decoded dec; | |
147 | struct net_device *out_dev; | |
03c57747 | 148 | struct mpls_dev *mdev; |
0189197f EB |
149 | unsigned int hh_len; |
150 | unsigned int new_header_size; | |
151 | unsigned int mtu; | |
152 | int err; | |
153 | ||
154 | /* Careful this entire function runs inside of an rcu critical section */ | |
155 | ||
03c57747 | 156 | mdev = mpls_dev_get(dev); |
37bde799 | 157 | if (!mdev || !mdev->input_enabled) |
03c57747 RS |
158 | goto drop; |
159 | ||
0189197f EB |
160 | if (skb->pkt_type != PACKET_HOST) |
161 | goto drop; | |
162 | ||
163 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
164 | goto drop; | |
165 | ||
166 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
167 | goto drop; | |
168 | ||
169 | /* Read and decode the label */ | |
170 | hdr = mpls_hdr(skb); | |
171 | dec = mpls_entry_decode(hdr); | |
172 | ||
173 | /* Pop the label */ | |
174 | skb_pull(skb, sizeof(*hdr)); | |
175 | skb_reset_network_header(skb); | |
176 | ||
177 | skb_orphan(skb); | |
178 | ||
179 | rt = mpls_route_input_rcu(net, dec.label); | |
180 | if (!rt) | |
181 | goto drop; | |
182 | ||
183 | /* Find the output device */ | |
19d0c341 | 184 | out_dev = rcu_dereference(rt->rt_dev); |
0189197f EB |
185 | if (!mpls_output_possible(out_dev)) |
186 | goto drop; | |
187 | ||
188 | if (skb_warn_if_lro(skb)) | |
189 | goto drop; | |
190 | ||
191 | skb_forward_csum(skb); | |
192 | ||
193 | /* Verify ttl is valid */ | |
aa7da937 | 194 | if (dec.ttl <= 1) |
0189197f EB |
195 | goto drop; |
196 | dec.ttl -= 1; | |
197 | ||
198 | /* Verify the destination can hold the packet */ | |
199 | new_header_size = mpls_rt_header_size(rt); | |
200 | mtu = mpls_dev_mtu(out_dev); | |
201 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) | |
202 | goto drop; | |
203 | ||
204 | hh_len = LL_RESERVED_SPACE(out_dev); | |
205 | if (!out_dev->header_ops) | |
206 | hh_len = 0; | |
207 | ||
208 | /* Ensure there is enough space for the headers in the skb */ | |
209 | if (skb_cow(skb, hh_len + new_header_size)) | |
210 | goto drop; | |
211 | ||
212 | skb->dev = out_dev; | |
213 | skb->protocol = htons(ETH_P_MPLS_UC); | |
214 | ||
215 | if (unlikely(!new_header_size && dec.bos)) { | |
216 | /* Penultimate hop popping */ | |
217 | if (!mpls_egress(rt, skb, dec)) | |
218 | goto drop; | |
219 | } else { | |
220 | bool bos; | |
221 | int i; | |
222 | skb_push(skb, new_header_size); | |
223 | skb_reset_network_header(skb); | |
224 | /* Push the new labels */ | |
225 | hdr = mpls_hdr(skb); | |
226 | bos = dec.bos; | |
227 | for (i = rt->rt_labels - 1; i >= 0; i--) { | |
228 | hdr[i] = mpls_entry_encode(rt->rt_label[i], dec.ttl, 0, bos); | |
229 | bos = false; | |
230 | } | |
231 | } | |
232 | ||
b79bda3d | 233 | err = neigh_xmit(rt->rt_via_table, out_dev, rt->rt_via, skb); |
0189197f EB |
234 | if (err) |
235 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", | |
236 | __func__, err); | |
237 | return 0; | |
238 | ||
239 | drop: | |
240 | kfree_skb(skb); | |
241 | return NET_RX_DROP; | |
242 | } | |
243 | ||
244 | static struct packet_type mpls_packet_type __read_mostly = { | |
245 | .type = cpu_to_be16(ETH_P_MPLS_UC), | |
246 | .func = mpls_forward, | |
247 | }; | |
248 | ||
f0126539 | 249 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
03c05665 EB |
250 | [RTA_DST] = { .type = NLA_U32 }, |
251 | [RTA_OIF] = { .type = NLA_U32 }, | |
252 | }; | |
253 | ||
a2519929 EB |
254 | struct mpls_route_config { |
255 | u32 rc_protocol; | |
256 | u32 rc_ifindex; | |
b79bda3d | 257 | u16 rc_via_table; |
a2519929 EB |
258 | u16 rc_via_alen; |
259 | u8 rc_via[MAX_VIA_ALEN]; | |
260 | u32 rc_label; | |
261 | u32 rc_output_labels; | |
262 | u32 rc_output_label[MAX_NEW_LABELS]; | |
263 | u32 rc_nlflags; | |
264 | struct nl_info rc_nlinfo; | |
265 | }; | |
266 | ||
0189197f EB |
267 | static struct mpls_route *mpls_rt_alloc(size_t alen) |
268 | { | |
269 | struct mpls_route *rt; | |
270 | ||
d865616e | 271 | rt = kzalloc(sizeof(*rt) + alen, GFP_KERNEL); |
0189197f EB |
272 | if (rt) |
273 | rt->rt_via_alen = alen; | |
274 | return rt; | |
275 | } | |
276 | ||
277 | static void mpls_rt_free(struct mpls_route *rt) | |
278 | { | |
279 | if (rt) | |
280 | kfree_rcu(rt, rt_rcu); | |
281 | } | |
282 | ||
8de147dc EB |
283 | static void mpls_notify_route(struct net *net, unsigned index, |
284 | struct mpls_route *old, struct mpls_route *new, | |
285 | const struct nl_info *info) | |
286 | { | |
287 | struct nlmsghdr *nlh = info ? info->nlh : NULL; | |
288 | unsigned portid = info ? info->portid : 0; | |
289 | int event = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
290 | struct mpls_route *rt = new ? new : old; | |
291 | unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; | |
292 | /* Ignore reserved labels for now */ | |
293 | if (rt && (index >= 16)) | |
294 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); | |
295 | } | |
296 | ||
0189197f EB |
297 | static void mpls_route_update(struct net *net, unsigned index, |
298 | struct net_device *dev, struct mpls_route *new, | |
299 | const struct nl_info *info) | |
300 | { | |
19d0c341 | 301 | struct mpls_route __rcu **platform_label; |
0189197f EB |
302 | struct mpls_route *rt, *old = NULL; |
303 | ||
304 | ASSERT_RTNL(); | |
305 | ||
19d0c341 EB |
306 | platform_label = rtnl_dereference(net->mpls.platform_label); |
307 | rt = rtnl_dereference(platform_label[index]); | |
308 | if (!dev || (rt && (rtnl_dereference(rt->rt_dev) == dev))) { | |
309 | rcu_assign_pointer(platform_label[index], new); | |
0189197f EB |
310 | old = rt; |
311 | } | |
312 | ||
8de147dc EB |
313 | mpls_notify_route(net, index, old, new, info); |
314 | ||
0189197f EB |
315 | /* If we removed a route free it now */ |
316 | mpls_rt_free(old); | |
317 | } | |
318 | ||
a2519929 EB |
319 | static unsigned find_free_label(struct net *net) |
320 | { | |
19d0c341 EB |
321 | struct mpls_route __rcu **platform_label; |
322 | size_t platform_labels; | |
a2519929 | 323 | unsigned index; |
19d0c341 EB |
324 | |
325 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
326 | platform_labels = net->mpls.platform_labels; | |
327 | for (index = 16; index < platform_labels; index++) { | |
328 | if (!rtnl_dereference(platform_label[index])) | |
a2519929 EB |
329 | return index; |
330 | } | |
331 | return LABEL_NOT_SPECIFIED; | |
332 | } | |
333 | ||
01faef2c RP |
334 | static struct net_device *inet_fib_lookup_dev(struct net *net, void *addr) |
335 | { | |
336 | struct net_device *dev = NULL; | |
337 | struct rtable *rt; | |
338 | struct in_addr daddr; | |
339 | ||
340 | memcpy(&daddr, addr, sizeof(struct in_addr)); | |
341 | rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); | |
342 | if (IS_ERR(rt)) | |
343 | goto errout; | |
344 | ||
345 | dev = rt->dst.dev; | |
346 | dev_hold(dev); | |
347 | ||
348 | ip_rt_put(rt); | |
349 | ||
350 | errout: | |
351 | return dev; | |
352 | } | |
353 | ||
354 | static struct net_device *inet6_fib_lookup_dev(struct net *net, void *addr) | |
355 | { | |
356 | struct net_device *dev = NULL; | |
357 | struct dst_entry *dst; | |
358 | struct flowi6 fl6; | |
359 | ||
360 | memset(&fl6, 0, sizeof(fl6)); | |
361 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); | |
362 | dst = ip6_route_output(net, NULL, &fl6); | |
363 | if (dst->error) | |
364 | goto errout; | |
365 | ||
366 | dev = dst->dev; | |
367 | dev_hold(dev); | |
368 | ||
369 | errout: | |
370 | dst_release(dst); | |
371 | ||
372 | return dev; | |
373 | } | |
374 | ||
375 | static struct net_device *find_outdev(struct net *net, | |
376 | struct mpls_route_config *cfg) | |
377 | { | |
378 | struct net_device *dev = NULL; | |
379 | ||
380 | if (!cfg->rc_ifindex) { | |
381 | switch (cfg->rc_via_table) { | |
382 | case NEIGH_ARP_TABLE: | |
383 | dev = inet_fib_lookup_dev(net, cfg->rc_via); | |
384 | break; | |
385 | case NEIGH_ND_TABLE: | |
386 | dev = inet6_fib_lookup_dev(net, cfg->rc_via); | |
387 | break; | |
388 | case NEIGH_LINK_TABLE: | |
389 | break; | |
390 | } | |
391 | } else { | |
392 | dev = dev_get_by_index(net, cfg->rc_ifindex); | |
393 | } | |
394 | ||
395 | return dev; | |
396 | } | |
397 | ||
a2519929 EB |
398 | static int mpls_route_add(struct mpls_route_config *cfg) |
399 | { | |
19d0c341 | 400 | struct mpls_route __rcu **platform_label; |
a2519929 EB |
401 | struct net *net = cfg->rc_nlinfo.nl_net; |
402 | struct net_device *dev = NULL; | |
403 | struct mpls_route *rt, *old; | |
404 | unsigned index; | |
405 | int i; | |
406 | int err = -EINVAL; | |
407 | ||
408 | index = cfg->rc_label; | |
409 | ||
410 | /* If a label was not specified during insert pick one */ | |
411 | if ((index == LABEL_NOT_SPECIFIED) && | |
412 | (cfg->rc_nlflags & NLM_F_CREATE)) { | |
413 | index = find_free_label(net); | |
414 | } | |
415 | ||
416 | /* The first 16 labels are reserved, and may not be set */ | |
417 | if (index < 16) | |
418 | goto errout; | |
419 | ||
420 | /* The full 20 bit range may not be supported. */ | |
421 | if (index >= net->mpls.platform_labels) | |
422 | goto errout; | |
423 | ||
424 | /* Ensure only a supported number of labels are present */ | |
425 | if (cfg->rc_output_labels > MAX_NEW_LABELS) | |
426 | goto errout; | |
427 | ||
428 | err = -ENODEV; | |
01faef2c | 429 | dev = find_outdev(net, cfg); |
a2519929 EB |
430 | if (!dev) |
431 | goto errout; | |
432 | ||
03c57747 | 433 | /* Ensure this is a supported device */ |
a2519929 | 434 | err = -EINVAL; |
03c57747 | 435 | if (!mpls_dev_get(dev)) |
a2519929 EB |
436 | goto errout; |
437 | ||
438 | err = -EINVAL; | |
b79bda3d | 439 | if ((cfg->rc_via_table == NEIGH_LINK_TABLE) && |
a2519929 EB |
440 | (dev->addr_len != cfg->rc_via_alen)) |
441 | goto errout; | |
442 | ||
443 | /* Append makes no sense with mpls */ | |
0f7bbd58 | 444 | err = -EOPNOTSUPP; |
a2519929 EB |
445 | if (cfg->rc_nlflags & NLM_F_APPEND) |
446 | goto errout; | |
447 | ||
448 | err = -EEXIST; | |
19d0c341 EB |
449 | platform_label = rtnl_dereference(net->mpls.platform_label); |
450 | old = rtnl_dereference(platform_label[index]); | |
a2519929 EB |
451 | if ((cfg->rc_nlflags & NLM_F_EXCL) && old) |
452 | goto errout; | |
453 | ||
454 | err = -EEXIST; | |
455 | if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) | |
456 | goto errout; | |
457 | ||
458 | err = -ENOENT; | |
459 | if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) | |
460 | goto errout; | |
461 | ||
462 | err = -ENOMEM; | |
463 | rt = mpls_rt_alloc(cfg->rc_via_alen); | |
464 | if (!rt) | |
465 | goto errout; | |
466 | ||
467 | rt->rt_labels = cfg->rc_output_labels; | |
468 | for (i = 0; i < rt->rt_labels; i++) | |
469 | rt->rt_label[i] = cfg->rc_output_label[i]; | |
470 | rt->rt_protocol = cfg->rc_protocol; | |
19d0c341 | 471 | RCU_INIT_POINTER(rt->rt_dev, dev); |
b79bda3d | 472 | rt->rt_via_table = cfg->rc_via_table; |
a2519929 EB |
473 | memcpy(rt->rt_via, cfg->rc_via, cfg->rc_via_alen); |
474 | ||
475 | mpls_route_update(net, index, NULL, rt, &cfg->rc_nlinfo); | |
476 | ||
477 | dev_put(dev); | |
478 | return 0; | |
479 | ||
480 | errout: | |
481 | if (dev) | |
482 | dev_put(dev); | |
483 | return err; | |
484 | } | |
485 | ||
486 | static int mpls_route_del(struct mpls_route_config *cfg) | |
487 | { | |
488 | struct net *net = cfg->rc_nlinfo.nl_net; | |
489 | unsigned index; | |
490 | int err = -EINVAL; | |
491 | ||
492 | index = cfg->rc_label; | |
493 | ||
494 | /* The first 16 labels are reserved, and may not be removed */ | |
495 | if (index < 16) | |
496 | goto errout; | |
497 | ||
498 | /* The full 20 bit range may not be supported */ | |
499 | if (index >= net->mpls.platform_labels) | |
500 | goto errout; | |
501 | ||
502 | mpls_route_update(net, index, NULL, NULL, &cfg->rc_nlinfo); | |
503 | ||
504 | err = 0; | |
505 | errout: | |
506 | return err; | |
507 | } | |
508 | ||
37bde799 RS |
509 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
510 | (&((struct mpls_dev *)0)->field) | |
511 | ||
512 | static const struct ctl_table mpls_dev_table[] = { | |
513 | { | |
514 | .procname = "input", | |
515 | .maxlen = sizeof(int), | |
516 | .mode = 0644, | |
517 | .proc_handler = proc_dointvec, | |
518 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), | |
519 | }, | |
520 | { } | |
521 | }; | |
522 | ||
523 | static int mpls_dev_sysctl_register(struct net_device *dev, | |
524 | struct mpls_dev *mdev) | |
525 | { | |
526 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; | |
527 | struct ctl_table *table; | |
528 | int i; | |
529 | ||
530 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); | |
531 | if (!table) | |
532 | goto out; | |
533 | ||
534 | /* Table data contains only offsets relative to the base of | |
535 | * the mdev at this point, so make them absolute. | |
536 | */ | |
537 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) | |
538 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; | |
539 | ||
540 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); | |
541 | ||
542 | mdev->sysctl = register_net_sysctl(dev_net(dev), path, table); | |
543 | if (!mdev->sysctl) | |
544 | goto free; | |
545 | ||
546 | return 0; | |
547 | ||
548 | free: | |
549 | kfree(table); | |
550 | out: | |
551 | return -ENOBUFS; | |
552 | } | |
553 | ||
554 | static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev) | |
555 | { | |
556 | struct ctl_table *table; | |
557 | ||
558 | table = mdev->sysctl->ctl_table_arg; | |
559 | unregister_net_sysctl_table(mdev->sysctl); | |
560 | kfree(table); | |
561 | } | |
562 | ||
03c57747 RS |
563 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
564 | { | |
565 | struct mpls_dev *mdev; | |
566 | int err = -ENOMEM; | |
567 | ||
568 | ASSERT_RTNL(); | |
569 | ||
570 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); | |
571 | if (!mdev) | |
572 | return ERR_PTR(err); | |
573 | ||
37bde799 RS |
574 | err = mpls_dev_sysctl_register(dev, mdev); |
575 | if (err) | |
576 | goto free; | |
577 | ||
03c57747 RS |
578 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
579 | ||
580 | return mdev; | |
37bde799 RS |
581 | |
582 | free: | |
583 | kfree(mdev); | |
584 | return ERR_PTR(err); | |
03c57747 RS |
585 | } |
586 | ||
0189197f EB |
587 | static void mpls_ifdown(struct net_device *dev) |
588 | { | |
19d0c341 | 589 | struct mpls_route __rcu **platform_label; |
0189197f | 590 | struct net *net = dev_net(dev); |
03c57747 | 591 | struct mpls_dev *mdev; |
0189197f EB |
592 | unsigned index; |
593 | ||
19d0c341 | 594 | platform_label = rtnl_dereference(net->mpls.platform_label); |
0189197f | 595 | for (index = 0; index < net->mpls.platform_labels; index++) { |
19d0c341 | 596 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
0189197f EB |
597 | if (!rt) |
598 | continue; | |
19d0c341 | 599 | if (rtnl_dereference(rt->rt_dev) != dev) |
0189197f EB |
600 | continue; |
601 | rt->rt_dev = NULL; | |
602 | } | |
03c57747 RS |
603 | |
604 | mdev = mpls_dev_get(dev); | |
605 | if (!mdev) | |
606 | return; | |
607 | ||
37bde799 RS |
608 | mpls_dev_sysctl_unregister(mdev); |
609 | ||
03c57747 RS |
610 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); |
611 | ||
25cc8f07 | 612 | kfree_rcu(mdev, rcu); |
0189197f EB |
613 | } |
614 | ||
615 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, | |
616 | void *ptr) | |
617 | { | |
618 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
03c57747 | 619 | struct mpls_dev *mdev; |
0189197f EB |
620 | |
621 | switch(event) { | |
03c57747 RS |
622 | case NETDEV_REGISTER: |
623 | /* For now just support ethernet devices */ | |
624 | if ((dev->type == ARPHRD_ETHER) || | |
625 | (dev->type == ARPHRD_LOOPBACK)) { | |
626 | mdev = mpls_add_dev(dev); | |
627 | if (IS_ERR(mdev)) | |
628 | return notifier_from_errno(PTR_ERR(mdev)); | |
629 | } | |
630 | break; | |
631 | ||
0189197f EB |
632 | case NETDEV_UNREGISTER: |
633 | mpls_ifdown(dev); | |
634 | break; | |
0fae3bf0 RS |
635 | case NETDEV_CHANGENAME: |
636 | mdev = mpls_dev_get(dev); | |
637 | if (mdev) { | |
638 | int err; | |
639 | ||
640 | mpls_dev_sysctl_unregister(mdev); | |
641 | err = mpls_dev_sysctl_register(dev, mdev); | |
642 | if (err) | |
643 | return notifier_from_errno(err); | |
644 | } | |
645 | break; | |
0189197f EB |
646 | } |
647 | return NOTIFY_OK; | |
648 | } | |
649 | ||
650 | static struct notifier_block mpls_dev_notifier = { | |
651 | .notifier_call = mpls_dev_notify, | |
652 | }; | |
653 | ||
03c05665 | 654 | static int nla_put_via(struct sk_buff *skb, |
b79bda3d | 655 | u8 table, const void *addr, int alen) |
03c05665 | 656 | { |
b79bda3d EB |
657 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
658 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, | |
659 | }; | |
03c05665 EB |
660 | struct nlattr *nla; |
661 | struct rtvia *via; | |
b79bda3d | 662 | int family = AF_UNSPEC; |
03c05665 EB |
663 | |
664 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
665 | if (!nla) | |
666 | return -EMSGSIZE; | |
667 | ||
b79bda3d EB |
668 | if (table <= NEIGH_NR_TABLES) |
669 | family = table_to_family[table]; | |
670 | ||
03c05665 EB |
671 | via = nla_data(nla); |
672 | via->rtvia_family = family; | |
673 | memcpy(via->rtvia_addr, addr, alen); | |
674 | return 0; | |
675 | } | |
676 | ||
966bae33 EB |
677 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
678 | u8 labels, const u32 label[]) | |
679 | { | |
680 | struct nlattr *nla; | |
681 | struct mpls_shim_hdr *nla_label; | |
682 | bool bos; | |
683 | int i; | |
684 | nla = nla_reserve(skb, attrtype, labels*4); | |
685 | if (!nla) | |
686 | return -EMSGSIZE; | |
687 | ||
688 | nla_label = nla_data(nla); | |
689 | bos = true; | |
690 | for (i = labels - 1; i >= 0; i--) { | |
691 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); | |
692 | bos = false; | |
693 | } | |
694 | ||
695 | return 0; | |
696 | } | |
face0188 | 697 | EXPORT_SYMBOL_GPL(nla_put_labels); |
966bae33 EB |
698 | |
699 | int nla_get_labels(const struct nlattr *nla, | |
700 | u32 max_labels, u32 *labels, u32 label[]) | |
701 | { | |
702 | unsigned len = nla_len(nla); | |
703 | unsigned nla_labels; | |
704 | struct mpls_shim_hdr *nla_label; | |
705 | bool bos; | |
706 | int i; | |
707 | ||
708 | /* len needs to be an even multiple of 4 (the label size) */ | |
709 | if (len & 3) | |
710 | return -EINVAL; | |
711 | ||
712 | /* Limit the number of new labels allowed */ | |
713 | nla_labels = len/4; | |
714 | if (nla_labels > max_labels) | |
715 | return -EINVAL; | |
716 | ||
717 | nla_label = nla_data(nla); | |
718 | bos = true; | |
719 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { | |
720 | struct mpls_entry_decoded dec; | |
721 | dec = mpls_entry_decode(nla_label + i); | |
722 | ||
723 | /* Ensure the bottom of stack flag is properly set | |
724 | * and ttl and tc are both clear. | |
725 | */ | |
726 | if ((dec.bos != bos) || dec.ttl || dec.tc) | |
727 | return -EINVAL; | |
728 | ||
5a9ab017 | 729 | switch (dec.label) { |
78f5b899 | 730 | case MPLS_LABEL_IMPLNULL: |
5a9ab017 RS |
731 | /* RFC3032: This is a label that an LSR may |
732 | * assign and distribute, but which never | |
733 | * actually appears in the encapsulation. | |
734 | */ | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
966bae33 EB |
738 | label[i] = dec.label; |
739 | } | |
740 | *labels = nla_labels; | |
741 | return 0; | |
742 | } | |
face0188 | 743 | EXPORT_SYMBOL_GPL(nla_get_labels); |
966bae33 | 744 | |
03c05665 EB |
745 | static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, |
746 | struct mpls_route_config *cfg) | |
747 | { | |
748 | struct rtmsg *rtm; | |
749 | struct nlattr *tb[RTA_MAX+1]; | |
750 | int index; | |
751 | int err; | |
752 | ||
753 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy); | |
754 | if (err < 0) | |
755 | goto errout; | |
756 | ||
757 | err = -EINVAL; | |
758 | rtm = nlmsg_data(nlh); | |
759 | memset(cfg, 0, sizeof(*cfg)); | |
760 | ||
761 | if (rtm->rtm_family != AF_MPLS) | |
762 | goto errout; | |
763 | if (rtm->rtm_dst_len != 20) | |
764 | goto errout; | |
765 | if (rtm->rtm_src_len != 0) | |
766 | goto errout; | |
767 | if (rtm->rtm_tos != 0) | |
768 | goto errout; | |
769 | if (rtm->rtm_table != RT_TABLE_MAIN) | |
770 | goto errout; | |
771 | /* Any value is acceptable for rtm_protocol */ | |
772 | ||
773 | /* As mpls uses destination specific addresses | |
774 | * (or source specific address in the case of multicast) | |
775 | * all addresses have universal scope. | |
776 | */ | |
777 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) | |
778 | goto errout; | |
779 | if (rtm->rtm_type != RTN_UNICAST) | |
780 | goto errout; | |
781 | if (rtm->rtm_flags != 0) | |
782 | goto errout; | |
783 | ||
784 | cfg->rc_label = LABEL_NOT_SPECIFIED; | |
785 | cfg->rc_protocol = rtm->rtm_protocol; | |
786 | cfg->rc_nlflags = nlh->nlmsg_flags; | |
787 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; | |
788 | cfg->rc_nlinfo.nlh = nlh; | |
789 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); | |
790 | ||
791 | for (index = 0; index <= RTA_MAX; index++) { | |
792 | struct nlattr *nla = tb[index]; | |
793 | if (!nla) | |
794 | continue; | |
795 | ||
796 | switch(index) { | |
797 | case RTA_OIF: | |
798 | cfg->rc_ifindex = nla_get_u32(nla); | |
799 | break; | |
800 | case RTA_NEWDST: | |
801 | if (nla_get_labels(nla, MAX_NEW_LABELS, | |
802 | &cfg->rc_output_labels, | |
803 | cfg->rc_output_label)) | |
804 | goto errout; | |
805 | break; | |
806 | case RTA_DST: | |
807 | { | |
808 | u32 label_count; | |
809 | if (nla_get_labels(nla, 1, &label_count, | |
810 | &cfg->rc_label)) | |
811 | goto errout; | |
812 | ||
813 | /* The first 16 labels are reserved, and may not be set */ | |
814 | if (cfg->rc_label < 16) | |
815 | goto errout; | |
816 | ||
817 | break; | |
818 | } | |
819 | case RTA_VIA: | |
820 | { | |
821 | struct rtvia *via = nla_data(nla); | |
f8d54afc RS |
822 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) |
823 | goto errout; | |
f8d54afc RS |
824 | cfg->rc_via_alen = nla_len(nla) - |
825 | offsetof(struct rtvia, rtvia_addr); | |
03c05665 EB |
826 | if (cfg->rc_via_alen > MAX_VIA_ALEN) |
827 | goto errout; | |
828 | ||
829 | /* Validate the address family */ | |
b79bda3d | 830 | switch(via->rtvia_family) { |
03c05665 | 831 | case AF_PACKET: |
b79bda3d | 832 | cfg->rc_via_table = NEIGH_LINK_TABLE; |
03c05665 EB |
833 | break; |
834 | case AF_INET: | |
b79bda3d | 835 | cfg->rc_via_table = NEIGH_ARP_TABLE; |
03c05665 EB |
836 | if (cfg->rc_via_alen != 4) |
837 | goto errout; | |
838 | break; | |
839 | case AF_INET6: | |
b79bda3d | 840 | cfg->rc_via_table = NEIGH_ND_TABLE; |
03c05665 EB |
841 | if (cfg->rc_via_alen != 16) |
842 | goto errout; | |
843 | break; | |
844 | default: | |
845 | /* Unsupported address family */ | |
846 | goto errout; | |
847 | } | |
848 | ||
849 | memcpy(cfg->rc_via, via->rtvia_addr, cfg->rc_via_alen); | |
850 | break; | |
851 | } | |
852 | default: | |
853 | /* Unsupported attribute */ | |
854 | goto errout; | |
855 | } | |
856 | } | |
857 | ||
858 | err = 0; | |
859 | errout: | |
860 | return err; | |
861 | } | |
862 | ||
863 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) | |
864 | { | |
865 | struct mpls_route_config cfg; | |
866 | int err; | |
867 | ||
868 | err = rtm_to_route_config(skb, nlh, &cfg); | |
869 | if (err < 0) | |
870 | return err; | |
871 | ||
872 | return mpls_route_del(&cfg); | |
873 | } | |
874 | ||
875 | ||
876 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) | |
877 | { | |
878 | struct mpls_route_config cfg; | |
879 | int err; | |
880 | ||
881 | err = rtm_to_route_config(skb, nlh, &cfg); | |
882 | if (err < 0) | |
883 | return err; | |
884 | ||
885 | return mpls_route_add(&cfg); | |
886 | } | |
887 | ||
888 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, | |
889 | u32 label, struct mpls_route *rt, int flags) | |
890 | { | |
19d0c341 | 891 | struct net_device *dev; |
03c05665 EB |
892 | struct nlmsghdr *nlh; |
893 | struct rtmsg *rtm; | |
894 | ||
895 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); | |
896 | if (nlh == NULL) | |
897 | return -EMSGSIZE; | |
898 | ||
899 | rtm = nlmsg_data(nlh); | |
900 | rtm->rtm_family = AF_MPLS; | |
901 | rtm->rtm_dst_len = 20; | |
902 | rtm->rtm_src_len = 0; | |
903 | rtm->rtm_tos = 0; | |
904 | rtm->rtm_table = RT_TABLE_MAIN; | |
905 | rtm->rtm_protocol = rt->rt_protocol; | |
906 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
907 | rtm->rtm_type = RTN_UNICAST; | |
908 | rtm->rtm_flags = 0; | |
909 | ||
910 | if (rt->rt_labels && | |
911 | nla_put_labels(skb, RTA_NEWDST, rt->rt_labels, rt->rt_label)) | |
912 | goto nla_put_failure; | |
b79bda3d | 913 | if (nla_put_via(skb, rt->rt_via_table, rt->rt_via, rt->rt_via_alen)) |
03c05665 | 914 | goto nla_put_failure; |
19d0c341 EB |
915 | dev = rtnl_dereference(rt->rt_dev); |
916 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
03c05665 EB |
917 | goto nla_put_failure; |
918 | if (nla_put_labels(skb, RTA_DST, 1, &label)) | |
919 | goto nla_put_failure; | |
920 | ||
921 | nlmsg_end(skb, nlh); | |
922 | return 0; | |
923 | ||
924 | nla_put_failure: | |
925 | nlmsg_cancel(skb, nlh); | |
926 | return -EMSGSIZE; | |
927 | } | |
928 | ||
929 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) | |
930 | { | |
931 | struct net *net = sock_net(skb->sk); | |
19d0c341 EB |
932 | struct mpls_route __rcu **platform_label; |
933 | size_t platform_labels; | |
03c05665 EB |
934 | unsigned int index; |
935 | ||
936 | ASSERT_RTNL(); | |
937 | ||
938 | index = cb->args[0]; | |
939 | if (index < 16) | |
940 | index = 16; | |
941 | ||
19d0c341 EB |
942 | platform_label = rtnl_dereference(net->mpls.platform_label); |
943 | platform_labels = net->mpls.platform_labels; | |
944 | for (; index < platform_labels; index++) { | |
03c05665 | 945 | struct mpls_route *rt; |
19d0c341 | 946 | rt = rtnl_dereference(platform_label[index]); |
03c05665 EB |
947 | if (!rt) |
948 | continue; | |
949 | ||
950 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, | |
951 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, | |
952 | index, rt, NLM_F_MULTI) < 0) | |
953 | break; | |
954 | } | |
955 | cb->args[0] = index; | |
956 | ||
957 | return skb->len; | |
958 | } | |
959 | ||
8de147dc EB |
960 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
961 | { | |
962 | size_t payload = | |
963 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
964 | + nla_total_size(2 + rt->rt_via_alen) /* RTA_VIA */ | |
965 | + nla_total_size(4); /* RTA_DST */ | |
966 | if (rt->rt_labels) /* RTA_NEWDST */ | |
967 | payload += nla_total_size(rt->rt_labels * 4); | |
968 | if (rt->rt_dev) /* RTA_OIF */ | |
969 | payload += nla_total_size(4); | |
970 | return payload; | |
971 | } | |
972 | ||
973 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, | |
974 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
975 | unsigned int nlm_flags) | |
976 | { | |
977 | struct sk_buff *skb; | |
978 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
979 | int err = -ENOBUFS; | |
980 | ||
981 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
982 | if (skb == NULL) | |
983 | goto errout; | |
984 | ||
985 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); | |
986 | if (err < 0) { | |
987 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
988 | WARN_ON(err == -EMSGSIZE); | |
989 | kfree_skb(skb); | |
990 | goto errout; | |
991 | } | |
992 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); | |
993 | ||
994 | return; | |
995 | errout: | |
996 | if (err < 0) | |
997 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); | |
998 | } | |
999 | ||
7720c01f EB |
1000 | static int resize_platform_label_table(struct net *net, size_t limit) |
1001 | { | |
1002 | size_t size = sizeof(struct mpls_route *) * limit; | |
1003 | size_t old_limit; | |
1004 | size_t cp_size; | |
1005 | struct mpls_route __rcu **labels = NULL, **old; | |
1006 | struct mpls_route *rt0 = NULL, *rt2 = NULL; | |
1007 | unsigned index; | |
1008 | ||
1009 | if (size) { | |
1010 | labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); | |
1011 | if (!labels) | |
1012 | labels = vzalloc(size); | |
1013 | ||
1014 | if (!labels) | |
1015 | goto nolabels; | |
1016 | } | |
1017 | ||
1018 | /* In case the predefined labels need to be populated */ | |
78f5b899 | 1019 | if (limit > MPLS_LABEL_IPV4NULL) { |
7720c01f EB |
1020 | struct net_device *lo = net->loopback_dev; |
1021 | rt0 = mpls_rt_alloc(lo->addr_len); | |
1022 | if (!rt0) | |
1023 | goto nort0; | |
19d0c341 | 1024 | RCU_INIT_POINTER(rt0->rt_dev, lo); |
7720c01f | 1025 | rt0->rt_protocol = RTPROT_KERNEL; |
b79bda3d | 1026 | rt0->rt_via_table = NEIGH_LINK_TABLE; |
7720c01f EB |
1027 | memcpy(rt0->rt_via, lo->dev_addr, lo->addr_len); |
1028 | } | |
78f5b899 | 1029 | if (limit > MPLS_LABEL_IPV6NULL) { |
7720c01f EB |
1030 | struct net_device *lo = net->loopback_dev; |
1031 | rt2 = mpls_rt_alloc(lo->addr_len); | |
1032 | if (!rt2) | |
1033 | goto nort2; | |
19d0c341 | 1034 | RCU_INIT_POINTER(rt2->rt_dev, lo); |
7720c01f | 1035 | rt2->rt_protocol = RTPROT_KERNEL; |
b79bda3d | 1036 | rt2->rt_via_table = NEIGH_LINK_TABLE; |
7720c01f EB |
1037 | memcpy(rt2->rt_via, lo->dev_addr, lo->addr_len); |
1038 | } | |
1039 | ||
1040 | rtnl_lock(); | |
1041 | /* Remember the original table */ | |
19d0c341 | 1042 | old = rtnl_dereference(net->mpls.platform_label); |
7720c01f EB |
1043 | old_limit = net->mpls.platform_labels; |
1044 | ||
1045 | /* Free any labels beyond the new table */ | |
1046 | for (index = limit; index < old_limit; index++) | |
1047 | mpls_route_update(net, index, NULL, NULL, NULL); | |
1048 | ||
1049 | /* Copy over the old labels */ | |
1050 | cp_size = size; | |
1051 | if (old_limit < limit) | |
1052 | cp_size = old_limit * sizeof(struct mpls_route *); | |
1053 | ||
1054 | memcpy(labels, old, cp_size); | |
1055 | ||
1056 | /* If needed set the predefined labels */ | |
78f5b899 TH |
1057 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
1058 | (limit > MPLS_LABEL_IPV6NULL)) { | |
1059 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); | |
7720c01f EB |
1060 | rt2 = NULL; |
1061 | } | |
1062 | ||
78f5b899 TH |
1063 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
1064 | (limit > MPLS_LABEL_IPV4NULL)) { | |
1065 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); | |
7720c01f EB |
1066 | rt0 = NULL; |
1067 | } | |
1068 | ||
1069 | /* Update the global pointers */ | |
1070 | net->mpls.platform_labels = limit; | |
19d0c341 | 1071 | rcu_assign_pointer(net->mpls.platform_label, labels); |
7720c01f EB |
1072 | |
1073 | rtnl_unlock(); | |
1074 | ||
1075 | mpls_rt_free(rt2); | |
1076 | mpls_rt_free(rt0); | |
1077 | ||
1078 | if (old) { | |
1079 | synchronize_rcu(); | |
1080 | kvfree(old); | |
1081 | } | |
1082 | return 0; | |
1083 | ||
1084 | nort2: | |
1085 | mpls_rt_free(rt0); | |
1086 | nort0: | |
1087 | kvfree(labels); | |
1088 | nolabels: | |
1089 | return -ENOMEM; | |
1090 | } | |
1091 | ||
1092 | static int mpls_platform_labels(struct ctl_table *table, int write, | |
1093 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1094 | { | |
1095 | struct net *net = table->data; | |
1096 | int platform_labels = net->mpls.platform_labels; | |
1097 | int ret; | |
1098 | struct ctl_table tmp = { | |
1099 | .procname = table->procname, | |
1100 | .data = &platform_labels, | |
1101 | .maxlen = sizeof(int), | |
1102 | .mode = table->mode, | |
1103 | .extra1 = &zero, | |
1104 | .extra2 = &label_limit, | |
1105 | }; | |
1106 | ||
1107 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1108 | ||
1109 | if (write && ret == 0) | |
1110 | ret = resize_platform_label_table(net, platform_labels); | |
1111 | ||
1112 | return ret; | |
1113 | } | |
1114 | ||
37bde799 | 1115 | static const struct ctl_table mpls_table[] = { |
7720c01f EB |
1116 | { |
1117 | .procname = "platform_labels", | |
1118 | .data = NULL, | |
1119 | .maxlen = sizeof(int), | |
1120 | .mode = 0644, | |
1121 | .proc_handler = mpls_platform_labels, | |
1122 | }, | |
1123 | { } | |
1124 | }; | |
1125 | ||
0189197f EB |
1126 | static int mpls_net_init(struct net *net) |
1127 | { | |
7720c01f EB |
1128 | struct ctl_table *table; |
1129 | ||
0189197f EB |
1130 | net->mpls.platform_labels = 0; |
1131 | net->mpls.platform_label = NULL; | |
1132 | ||
7720c01f EB |
1133 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
1134 | if (table == NULL) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | table[0].data = net; | |
1138 | net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); | |
1139 | if (net->mpls.ctl == NULL) | |
1140 | return -ENOMEM; | |
1141 | ||
0189197f EB |
1142 | return 0; |
1143 | } | |
1144 | ||
1145 | static void mpls_net_exit(struct net *net) | |
1146 | { | |
19d0c341 EB |
1147 | struct mpls_route __rcu **platform_label; |
1148 | size_t platform_labels; | |
7720c01f | 1149 | struct ctl_table *table; |
0189197f EB |
1150 | unsigned int index; |
1151 | ||
7720c01f EB |
1152 | table = net->mpls.ctl->ctl_table_arg; |
1153 | unregister_net_sysctl_table(net->mpls.ctl); | |
1154 | kfree(table); | |
1155 | ||
19d0c341 EB |
1156 | /* An rcu grace period has passed since there was a device in |
1157 | * the network namespace (and thus the last in flight packet) | |
0189197f EB |
1158 | * left this network namespace. This is because |
1159 | * unregister_netdevice_many and netdev_run_todo has completed | |
1160 | * for each network device that was in this network namespace. | |
1161 | * | |
1162 | * As such no additional rcu synchronization is necessary when | |
1163 | * freeing the platform_label table. | |
1164 | */ | |
1165 | rtnl_lock(); | |
19d0c341 EB |
1166 | platform_label = rtnl_dereference(net->mpls.platform_label); |
1167 | platform_labels = net->mpls.platform_labels; | |
1168 | for (index = 0; index < platform_labels; index++) { | |
1169 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
1170 | RCU_INIT_POINTER(platform_label[index], NULL); | |
0189197f EB |
1171 | mpls_rt_free(rt); |
1172 | } | |
1173 | rtnl_unlock(); | |
1174 | ||
19d0c341 | 1175 | kvfree(platform_label); |
0189197f EB |
1176 | } |
1177 | ||
1178 | static struct pernet_operations mpls_net_ops = { | |
1179 | .init = mpls_net_init, | |
1180 | .exit = mpls_net_exit, | |
1181 | }; | |
1182 | ||
1183 | static int __init mpls_init(void) | |
1184 | { | |
1185 | int err; | |
1186 | ||
1187 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); | |
1188 | ||
1189 | err = register_pernet_subsys(&mpls_net_ops); | |
1190 | if (err) | |
1191 | goto out; | |
1192 | ||
1193 | err = register_netdevice_notifier(&mpls_dev_notifier); | |
1194 | if (err) | |
1195 | goto out_unregister_pernet; | |
1196 | ||
1197 | dev_add_pack(&mpls_packet_type); | |
1198 | ||
03c05665 EB |
1199 | rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); |
1200 | rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); | |
1201 | rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); | |
0189197f EB |
1202 | err = 0; |
1203 | out: | |
1204 | return err; | |
1205 | ||
1206 | out_unregister_pernet: | |
1207 | unregister_pernet_subsys(&mpls_net_ops); | |
1208 | goto out; | |
1209 | } | |
1210 | module_init(mpls_init); | |
1211 | ||
1212 | static void __exit mpls_exit(void) | |
1213 | { | |
03c05665 | 1214 | rtnl_unregister_all(PF_MPLS); |
0189197f EB |
1215 | dev_remove_pack(&mpls_packet_type); |
1216 | unregister_netdevice_notifier(&mpls_dev_notifier); | |
1217 | unregister_pernet_subsys(&mpls_net_ops); | |
1218 | } | |
1219 | module_exit(mpls_exit); | |
1220 | ||
1221 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); | |
1222 | MODULE_LICENSE("GPL v2"); | |
1223 | MODULE_ALIAS_NETPROTO(PF_MPLS); |