Commit | Line | Data |
---|---|---|
0189197f EB |
1 | #include <linux/types.h> |
2 | #include <linux/skbuff.h> | |
3 | #include <linux/socket.h> | |
7720c01f | 4 | #include <linux/sysctl.h> |
0189197f EB |
5 | #include <linux/net.h> |
6 | #include <linux/module.h> | |
7 | #include <linux/if_arp.h> | |
8 | #include <linux/ipv6.h> | |
9 | #include <linux/mpls.h> | |
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 | ||
ae7ef81e | 94 | if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu)) |
0189197f EB |
95 | return false; |
96 | ||
97 | return true; | |
98 | } | |
face0188 | 99 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
0189197f | 100 | |
c89359a4 RP |
101 | static u32 mpls_multipath_hash(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; | |
1c78efa8 RS |
108 | u32 hash = 0; |
109 | ||
1c78efa8 RS |
110 | for (label_index = 0; label_index < MAX_MP_SELECT_LABELS && !bos; |
111 | label_index++) { | |
112 | if (!pskb_may_pull(skb, sizeof(*hdr) * label_index)) | |
113 | break; | |
114 | ||
115 | /* Read and decode the current label */ | |
116 | hdr = mpls_hdr(skb) + label_index; | |
117 | dec = mpls_entry_decode(hdr); | |
118 | ||
119 | /* RFC6790 - reserved labels MUST NOT be used as keys | |
120 | * for the load-balancing function | |
121 | */ | |
122 | if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { | |
123 | hash = jhash_1word(dec.label, hash); | |
124 | ||
125 | /* The entropy label follows the entropy label | |
126 | * indicator, so this means that the entropy | |
127 | * label was just added to the hash - no need to | |
128 | * go any deeper either in the label stack or in the | |
129 | * payload | |
130 | */ | |
131 | if (eli_seen) | |
132 | break; | |
133 | } else if (dec.label == MPLS_LABEL_ENTROPY) { | |
134 | eli_seen = true; | |
135 | } | |
136 | ||
137 | bos = dec.bos; | |
138 | if (bos && pskb_may_pull(skb, sizeof(*hdr) * label_index + | |
139 | sizeof(struct iphdr))) { | |
140 | const struct iphdr *v4hdr; | |
141 | ||
142 | v4hdr = (const struct iphdr *)(mpls_hdr(skb) + | |
143 | label_index); | |
144 | if (v4hdr->version == 4) { | |
145 | hash = jhash_3words(ntohl(v4hdr->saddr), | |
146 | ntohl(v4hdr->daddr), | |
147 | v4hdr->protocol, hash); | |
148 | } else if (v4hdr->version == 6 && | |
149 | pskb_may_pull(skb, sizeof(*hdr) * label_index + | |
150 | sizeof(struct ipv6hdr))) { | |
151 | const struct ipv6hdr *v6hdr; | |
152 | ||
153 | v6hdr = (const struct ipv6hdr *)(mpls_hdr(skb) + | |
154 | label_index); | |
155 | ||
156 | hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); | |
157 | hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); | |
158 | hash = jhash_1word(v6hdr->nexthdr, hash); | |
159 | } | |
160 | } | |
161 | } | |
162 | ||
c89359a4 RP |
163 | return hash; |
164 | } | |
165 | ||
166 | static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, | |
167 | struct sk_buff *skb, bool bos) | |
168 | { | |
169 | int alive = ACCESS_ONCE(rt->rt_nhn_alive); | |
170 | u32 hash = 0; | |
171 | int nh_index = 0; | |
172 | int n = 0; | |
173 | ||
174 | /* No need to look further into packet if there's only | |
175 | * one path | |
176 | */ | |
177 | if (rt->rt_nhn == 1) | |
178 | goto out; | |
179 | ||
180 | if (alive <= 0) | |
181 | return NULL; | |
182 | ||
183 | hash = mpls_multipath_hash(rt, skb, bos); | |
184 | nh_index = hash % alive; | |
185 | if (alive == rt->rt_nhn) | |
186 | goto out; | |
187 | for_nexthops(rt) { | |
188 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) | |
189 | continue; | |
190 | if (n == nh_index) | |
191 | return nh; | |
192 | n++; | |
193 | } endfor_nexthops(rt); | |
194 | ||
1c78efa8 RS |
195 | out: |
196 | return &rt->rt_nh[nh_index]; | |
f8efb73c RP |
197 | } |
198 | ||
0189197f EB |
199 | static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb, |
200 | struct mpls_entry_decoded dec) | |
201 | { | |
118d5234 RS |
202 | enum mpls_payload_type payload_type; |
203 | bool success = false; | |
0189197f | 204 | |
76fecd82 EB |
205 | /* The IPv4 code below accesses through the IPv4 header |
206 | * checksum, which is 12 bytes into the packet. | |
207 | * The IPv6 code below accesses through the IPv6 hop limit | |
208 | * which is 8 bytes into the packet. | |
209 | * | |
210 | * For all supported cases there should always be at least 12 | |
211 | * bytes of packet data present. The IPv4 header is 20 bytes | |
212 | * without options and the IPv6 header is always 40 bytes | |
213 | * long. | |
214 | */ | |
215 | if (!pskb_may_pull(skb, 12)) | |
216 | return false; | |
217 | ||
118d5234 RS |
218 | payload_type = rt->rt_payload_type; |
219 | if (payload_type == MPT_UNSPEC) | |
220 | payload_type = ip_hdr(skb)->version; | |
221 | ||
222 | switch (payload_type) { | |
223 | case MPT_IPV4: { | |
224 | struct iphdr *hdr4 = ip_hdr(skb); | |
0189197f EB |
225 | skb->protocol = htons(ETH_P_IP); |
226 | csum_replace2(&hdr4->check, | |
227 | htons(hdr4->ttl << 8), | |
228 | htons(dec.ttl << 8)); | |
229 | hdr4->ttl = dec.ttl; | |
118d5234 RS |
230 | success = true; |
231 | break; | |
0189197f | 232 | } |
118d5234 | 233 | case MPT_IPV6: { |
0189197f EB |
234 | struct ipv6hdr *hdr6 = ipv6_hdr(skb); |
235 | skb->protocol = htons(ETH_P_IPV6); | |
236 | hdr6->hop_limit = dec.ttl; | |
118d5234 RS |
237 | success = true; |
238 | break; | |
0189197f | 239 | } |
118d5234 RS |
240 | case MPT_UNSPEC: |
241 | break; | |
242 | } | |
243 | ||
0189197f EB |
244 | return success; |
245 | } | |
246 | ||
247 | static int mpls_forward(struct sk_buff *skb, struct net_device *dev, | |
248 | struct packet_type *pt, struct net_device *orig_dev) | |
249 | { | |
250 | struct net *net = dev_net(dev); | |
251 | struct mpls_shim_hdr *hdr; | |
252 | struct mpls_route *rt; | |
f8efb73c | 253 | struct mpls_nh *nh; |
0189197f EB |
254 | struct mpls_entry_decoded dec; |
255 | struct net_device *out_dev; | |
03c57747 | 256 | struct mpls_dev *mdev; |
0189197f EB |
257 | unsigned int hh_len; |
258 | unsigned int new_header_size; | |
259 | unsigned int mtu; | |
260 | int err; | |
261 | ||
262 | /* Careful this entire function runs inside of an rcu critical section */ | |
263 | ||
03c57747 | 264 | mdev = mpls_dev_get(dev); |
37bde799 | 265 | if (!mdev || !mdev->input_enabled) |
03c57747 RS |
266 | goto drop; |
267 | ||
0189197f EB |
268 | if (skb->pkt_type != PACKET_HOST) |
269 | goto drop; | |
270 | ||
271 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
272 | goto drop; | |
273 | ||
274 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
275 | goto drop; | |
276 | ||
277 | /* Read and decode the label */ | |
278 | hdr = mpls_hdr(skb); | |
279 | dec = mpls_entry_decode(hdr); | |
280 | ||
281 | /* Pop the label */ | |
282 | skb_pull(skb, sizeof(*hdr)); | |
283 | skb_reset_network_header(skb); | |
284 | ||
285 | skb_orphan(skb); | |
286 | ||
287 | rt = mpls_route_input_rcu(net, dec.label); | |
288 | if (!rt) | |
289 | goto drop; | |
290 | ||
1c78efa8 | 291 | nh = mpls_select_multipath(rt, skb, dec.bos); |
f8efb73c RP |
292 | if (!nh) |
293 | goto drop; | |
294 | ||
0189197f | 295 | /* Find the output device */ |
f8efb73c | 296 | out_dev = rcu_dereference(nh->nh_dev); |
0189197f EB |
297 | if (!mpls_output_possible(out_dev)) |
298 | goto drop; | |
299 | ||
300 | if (skb_warn_if_lro(skb)) | |
301 | goto drop; | |
302 | ||
303 | skb_forward_csum(skb); | |
304 | ||
305 | /* Verify ttl is valid */ | |
aa7da937 | 306 | if (dec.ttl <= 1) |
0189197f EB |
307 | goto drop; |
308 | dec.ttl -= 1; | |
309 | ||
310 | /* Verify the destination can hold the packet */ | |
f8efb73c | 311 | new_header_size = mpls_nh_header_size(nh); |
0189197f EB |
312 | mtu = mpls_dev_mtu(out_dev); |
313 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) | |
314 | goto drop; | |
315 | ||
316 | hh_len = LL_RESERVED_SPACE(out_dev); | |
317 | if (!out_dev->header_ops) | |
318 | hh_len = 0; | |
319 | ||
320 | /* Ensure there is enough space for the headers in the skb */ | |
321 | if (skb_cow(skb, hh_len + new_header_size)) | |
322 | goto drop; | |
323 | ||
324 | skb->dev = out_dev; | |
325 | skb->protocol = htons(ETH_P_MPLS_UC); | |
326 | ||
327 | if (unlikely(!new_header_size && dec.bos)) { | |
328 | /* Penultimate hop popping */ | |
329 | if (!mpls_egress(rt, skb, dec)) | |
330 | goto drop; | |
331 | } else { | |
332 | bool bos; | |
333 | int i; | |
334 | skb_push(skb, new_header_size); | |
335 | skb_reset_network_header(skb); | |
336 | /* Push the new labels */ | |
337 | hdr = mpls_hdr(skb); | |
338 | bos = dec.bos; | |
f8efb73c RP |
339 | for (i = nh->nh_labels - 1; i >= 0; i--) { |
340 | hdr[i] = mpls_entry_encode(nh->nh_label[i], | |
341 | dec.ttl, 0, bos); | |
0189197f EB |
342 | bos = false; |
343 | } | |
344 | } | |
345 | ||
eb7809f0 RS |
346 | /* If via wasn't specified then send out using device address */ |
347 | if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) | |
348 | err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, | |
349 | out_dev->dev_addr, skb); | |
350 | else | |
351 | err = neigh_xmit(nh->nh_via_table, out_dev, | |
352 | mpls_nh_via(rt, nh), skb); | |
0189197f EB |
353 | if (err) |
354 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", | |
355 | __func__, err); | |
356 | return 0; | |
357 | ||
358 | drop: | |
359 | kfree_skb(skb); | |
360 | return NET_RX_DROP; | |
361 | } | |
362 | ||
363 | static struct packet_type mpls_packet_type __read_mostly = { | |
364 | .type = cpu_to_be16(ETH_P_MPLS_UC), | |
365 | .func = mpls_forward, | |
366 | }; | |
367 | ||
f0126539 | 368 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
03c05665 EB |
369 | [RTA_DST] = { .type = NLA_U32 }, |
370 | [RTA_OIF] = { .type = NLA_U32 }, | |
371 | }; | |
372 | ||
a2519929 | 373 | struct mpls_route_config { |
118d5234 RS |
374 | u32 rc_protocol; |
375 | u32 rc_ifindex; | |
f8efb73c RP |
376 | u8 rc_via_table; |
377 | u8 rc_via_alen; | |
118d5234 RS |
378 | u8 rc_via[MAX_VIA_ALEN]; |
379 | u32 rc_label; | |
f8efb73c | 380 | u8 rc_output_labels; |
118d5234 RS |
381 | u32 rc_output_label[MAX_NEW_LABELS]; |
382 | u32 rc_nlflags; | |
383 | enum mpls_payload_type rc_payload_type; | |
384 | struct nl_info rc_nlinfo; | |
f8efb73c RP |
385 | struct rtnexthop *rc_mp; |
386 | int rc_mp_len; | |
a2519929 EB |
387 | }; |
388 | ||
cf4b24f0 | 389 | static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen) |
0189197f | 390 | { |
cf4b24f0 | 391 | u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN); |
0189197f EB |
392 | struct mpls_route *rt; |
393 | ||
cf4b24f0 RS |
394 | rt = kzalloc(ALIGN(sizeof(*rt) + num_nh * sizeof(*rt->rt_nh), |
395 | VIA_ALEN_ALIGN) + | |
396 | num_nh * max_alen_aligned, | |
f8efb73c | 397 | GFP_KERNEL); |
cf4b24f0 | 398 | if (rt) { |
f8efb73c | 399 | rt->rt_nhn = num_nh; |
c89359a4 | 400 | rt->rt_nhn_alive = num_nh; |
cf4b24f0 RS |
401 | rt->rt_max_alen = max_alen_aligned; |
402 | } | |
f8efb73c | 403 | |
0189197f EB |
404 | return rt; |
405 | } | |
406 | ||
407 | static void mpls_rt_free(struct mpls_route *rt) | |
408 | { | |
409 | if (rt) | |
410 | kfree_rcu(rt, rt_rcu); | |
411 | } | |
412 | ||
8de147dc EB |
413 | static void mpls_notify_route(struct net *net, unsigned index, |
414 | struct mpls_route *old, struct mpls_route *new, | |
415 | const struct nl_info *info) | |
416 | { | |
417 | struct nlmsghdr *nlh = info ? info->nlh : NULL; | |
418 | unsigned portid = info ? info->portid : 0; | |
419 | int event = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
420 | struct mpls_route *rt = new ? new : old; | |
421 | unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; | |
422 | /* Ignore reserved labels for now */ | |
a6affd24 | 423 | if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) |
8de147dc EB |
424 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); |
425 | } | |
426 | ||
0189197f | 427 | static void mpls_route_update(struct net *net, unsigned index, |
f8efb73c | 428 | struct mpls_route *new, |
0189197f EB |
429 | const struct nl_info *info) |
430 | { | |
19d0c341 | 431 | struct mpls_route __rcu **platform_label; |
f8efb73c | 432 | struct mpls_route *rt; |
0189197f EB |
433 | |
434 | ASSERT_RTNL(); | |
435 | ||
19d0c341 EB |
436 | platform_label = rtnl_dereference(net->mpls.platform_label); |
437 | rt = rtnl_dereference(platform_label[index]); | |
f8efb73c | 438 | rcu_assign_pointer(platform_label[index], new); |
0189197f | 439 | |
f8efb73c | 440 | mpls_notify_route(net, index, rt, new, info); |
8de147dc | 441 | |
0189197f | 442 | /* If we removed a route free it now */ |
f8efb73c | 443 | mpls_rt_free(rt); |
0189197f EB |
444 | } |
445 | ||
a2519929 EB |
446 | static unsigned find_free_label(struct net *net) |
447 | { | |
19d0c341 EB |
448 | struct mpls_route __rcu **platform_label; |
449 | size_t platform_labels; | |
a2519929 | 450 | unsigned index; |
19d0c341 EB |
451 | |
452 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
453 | platform_labels = net->mpls.platform_labels; | |
a6affd24 RS |
454 | for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; |
455 | index++) { | |
19d0c341 | 456 | if (!rtnl_dereference(platform_label[index])) |
a2519929 EB |
457 | return index; |
458 | } | |
459 | return LABEL_NOT_SPECIFIED; | |
460 | } | |
461 | ||
bf21563a | 462 | #if IS_ENABLED(CONFIG_INET) |
cf4b24f0 RS |
463 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
464 | const void *addr) | |
01faef2c | 465 | { |
5a9348b5 | 466 | struct net_device *dev; |
01faef2c RP |
467 | struct rtable *rt; |
468 | struct in_addr daddr; | |
469 | ||
470 | memcpy(&daddr, addr, sizeof(struct in_addr)); | |
471 | rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); | |
472 | if (IS_ERR(rt)) | |
5a9348b5 | 473 | return ERR_CAST(rt); |
01faef2c RP |
474 | |
475 | dev = rt->dst.dev; | |
476 | dev_hold(dev); | |
477 | ||
478 | ip_rt_put(rt); | |
479 | ||
01faef2c | 480 | return dev; |
bf21563a RP |
481 | } |
482 | #else | |
cf4b24f0 RS |
483 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
484 | const void *addr) | |
bf21563a RP |
485 | { |
486 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c | 487 | } |
bf21563a | 488 | #endif |
01faef2c | 489 | |
bf21563a | 490 | #if IS_ENABLED(CONFIG_IPV6) |
cf4b24f0 RS |
491 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
492 | const void *addr) | |
01faef2c | 493 | { |
5a9348b5 | 494 | struct net_device *dev; |
01faef2c RP |
495 | struct dst_entry *dst; |
496 | struct flowi6 fl6; | |
bf21563a RP |
497 | int err; |
498 | ||
499 | if (!ipv6_stub) | |
500 | return ERR_PTR(-EAFNOSUPPORT); | |
01faef2c RP |
501 | |
502 | memset(&fl6, 0, sizeof(fl6)); | |
503 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); | |
bf21563a RP |
504 | err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); |
505 | if (err) | |
5a9348b5 | 506 | return ERR_PTR(err); |
01faef2c RP |
507 | |
508 | dev = dst->dev; | |
509 | dev_hold(dev); | |
01faef2c RP |
510 | dst_release(dst); |
511 | ||
512 | return dev; | |
513 | } | |
bf21563a | 514 | #else |
cf4b24f0 RS |
515 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
516 | const void *addr) | |
bf21563a RP |
517 | { |
518 | return ERR_PTR(-EAFNOSUPPORT); | |
519 | } | |
520 | #endif | |
01faef2c RP |
521 | |
522 | static struct net_device *find_outdev(struct net *net, | |
cf4b24f0 | 523 | struct mpls_route *rt, |
f8efb73c | 524 | struct mpls_nh *nh, int oif) |
01faef2c RP |
525 | { |
526 | struct net_device *dev = NULL; | |
527 | ||
f8efb73c RP |
528 | if (!oif) { |
529 | switch (nh->nh_via_table) { | |
01faef2c | 530 | case NEIGH_ARP_TABLE: |
cf4b24f0 | 531 | dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
532 | break; |
533 | case NEIGH_ND_TABLE: | |
cf4b24f0 | 534 | dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
01faef2c RP |
535 | break; |
536 | case NEIGH_LINK_TABLE: | |
537 | break; | |
538 | } | |
539 | } else { | |
f8efb73c | 540 | dev = dev_get_by_index(net, oif); |
01faef2c RP |
541 | } |
542 | ||
3dcb615e RP |
543 | if (!dev) |
544 | return ERR_PTR(-ENODEV); | |
545 | ||
94a57f1f RP |
546 | if (IS_ERR(dev)) |
547 | return dev; | |
548 | ||
f8efb73c RP |
549 | /* The caller is holding rtnl anyways, so release the dev reference */ |
550 | dev_put(dev); | |
551 | ||
01faef2c RP |
552 | return dev; |
553 | } | |
554 | ||
cf4b24f0 RS |
555 | static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, |
556 | struct mpls_nh *nh, int oif) | |
f8efb73c RP |
557 | { |
558 | struct net_device *dev = NULL; | |
559 | int err = -ENODEV; | |
560 | ||
cf4b24f0 | 561 | dev = find_outdev(net, rt, nh, oif); |
f8efb73c RP |
562 | if (IS_ERR(dev)) { |
563 | err = PTR_ERR(dev); | |
564 | dev = NULL; | |
565 | goto errout; | |
566 | } | |
567 | ||
568 | /* Ensure this is a supported device */ | |
569 | err = -EINVAL; | |
570 | if (!mpls_dev_get(dev)) | |
571 | goto errout; | |
572 | ||
a3e948e8 RS |
573 | if ((nh->nh_via_table == NEIGH_LINK_TABLE) && |
574 | (dev->addr_len != nh->nh_via_alen)) | |
575 | goto errout; | |
576 | ||
f8efb73c RP |
577 | RCU_INIT_POINTER(nh->nh_dev, dev); |
578 | ||
c89359a4 RP |
579 | if (!(dev->flags & IFF_UP)) { |
580 | nh->nh_flags |= RTNH_F_DEAD; | |
581 | } else { | |
582 | unsigned int flags; | |
583 | ||
584 | flags = dev_get_flags(dev); | |
585 | if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) | |
586 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
587 | } | |
588 | ||
f8efb73c RP |
589 | return 0; |
590 | ||
591 | errout: | |
592 | return err; | |
593 | } | |
594 | ||
595 | static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, | |
596 | struct mpls_route *rt) | |
597 | { | |
598 | struct net *net = cfg->rc_nlinfo.nl_net; | |
599 | struct mpls_nh *nh = rt->rt_nh; | |
600 | int err; | |
601 | int i; | |
602 | ||
603 | if (!nh) | |
604 | return -ENOMEM; | |
605 | ||
606 | err = -EINVAL; | |
607 | /* Ensure only a supported number of labels are present */ | |
608 | if (cfg->rc_output_labels > MAX_NEW_LABELS) | |
609 | goto errout; | |
610 | ||
611 | nh->nh_labels = cfg->rc_output_labels; | |
612 | for (i = 0; i < nh->nh_labels; i++) | |
613 | nh->nh_label[i] = cfg->rc_output_label[i]; | |
614 | ||
615 | nh->nh_via_table = cfg->rc_via_table; | |
cf4b24f0 | 616 | memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); |
f8efb73c RP |
617 | nh->nh_via_alen = cfg->rc_via_alen; |
618 | ||
cf4b24f0 | 619 | err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); |
f8efb73c RP |
620 | if (err) |
621 | goto errout; | |
622 | ||
c89359a4 RP |
623 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
624 | rt->rt_nhn_alive--; | |
625 | ||
f8efb73c RP |
626 | return 0; |
627 | ||
628 | errout: | |
629 | return err; | |
630 | } | |
631 | ||
cf4b24f0 | 632 | static int mpls_nh_build(struct net *net, struct mpls_route *rt, |
c89359a4 RP |
633 | struct mpls_nh *nh, int oif, struct nlattr *via, |
634 | struct nlattr *newdst) | |
f8efb73c RP |
635 | { |
636 | int err = -ENOMEM; | |
637 | ||
638 | if (!nh) | |
639 | goto errout; | |
640 | ||
641 | if (newdst) { | |
642 | err = nla_get_labels(newdst, MAX_NEW_LABELS, | |
643 | &nh->nh_labels, nh->nh_label); | |
644 | if (err) | |
645 | goto errout; | |
646 | } | |
647 | ||
f20367df RS |
648 | if (via) { |
649 | err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, | |
650 | __mpls_nh_via(rt, nh)); | |
651 | if (err) | |
652 | goto errout; | |
653 | } else { | |
654 | nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; | |
655 | } | |
f8efb73c | 656 | |
cf4b24f0 | 657 | err = mpls_nh_assign_dev(net, rt, nh, oif); |
f8efb73c RP |
658 | if (err) |
659 | goto errout; | |
660 | ||
661 | return 0; | |
662 | ||
663 | errout: | |
664 | return err; | |
665 | } | |
666 | ||
cf4b24f0 RS |
667 | static int mpls_count_nexthops(struct rtnexthop *rtnh, int len, |
668 | u8 cfg_via_alen, u8 *max_via_alen) | |
f8efb73c RP |
669 | { |
670 | int nhs = 0; | |
671 | int remaining = len; | |
672 | ||
cf4b24f0 RS |
673 | if (!rtnh) { |
674 | *max_via_alen = cfg_via_alen; | |
675 | return 1; | |
676 | } | |
677 | ||
678 | *max_via_alen = 0; | |
679 | ||
f8efb73c | 680 | while (rtnh_ok(rtnh, remaining)) { |
cf4b24f0 RS |
681 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
682 | int attrlen; | |
683 | ||
684 | attrlen = rtnh_attrlen(rtnh); | |
685 | nla = nla_find(attrs, attrlen, RTA_VIA); | |
686 | if (nla && nla_len(nla) >= | |
687 | offsetof(struct rtvia, rtvia_addr)) { | |
688 | int via_alen = nla_len(nla) - | |
689 | offsetof(struct rtvia, rtvia_addr); | |
690 | ||
691 | if (via_alen <= MAX_VIA_ALEN) | |
692 | *max_via_alen = max_t(u16, *max_via_alen, | |
693 | via_alen); | |
694 | } | |
695 | ||
f8efb73c RP |
696 | nhs++; |
697 | rtnh = rtnh_next(rtnh, &remaining); | |
698 | } | |
699 | ||
700 | /* leftover implies invalid nexthop configuration, discard it */ | |
701 | return remaining > 0 ? 0 : nhs; | |
702 | } | |
703 | ||
704 | static int mpls_nh_build_multi(struct mpls_route_config *cfg, | |
705 | struct mpls_route *rt) | |
706 | { | |
707 | struct rtnexthop *rtnh = cfg->rc_mp; | |
708 | struct nlattr *nla_via, *nla_newdst; | |
709 | int remaining = cfg->rc_mp_len; | |
710 | int nhs = 0; | |
711 | int err = 0; | |
712 | ||
713 | change_nexthops(rt) { | |
714 | int attrlen; | |
715 | ||
716 | nla_via = NULL; | |
717 | nla_newdst = NULL; | |
718 | ||
719 | err = -EINVAL; | |
720 | if (!rtnh_ok(rtnh, remaining)) | |
721 | goto errout; | |
722 | ||
1c78efa8 RS |
723 | /* neither weighted multipath nor any flags |
724 | * are supported | |
725 | */ | |
726 | if (rtnh->rtnh_hops || rtnh->rtnh_flags) | |
727 | goto errout; | |
728 | ||
f8efb73c RP |
729 | attrlen = rtnh_attrlen(rtnh); |
730 | if (attrlen > 0) { | |
731 | struct nlattr *attrs = rtnh_attrs(rtnh); | |
732 | ||
733 | nla_via = nla_find(attrs, attrlen, RTA_VIA); | |
734 | nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); | |
735 | } | |
736 | ||
cf4b24f0 | 737 | err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, |
c89359a4 | 738 | rtnh->rtnh_ifindex, nla_via, nla_newdst); |
f8efb73c RP |
739 | if (err) |
740 | goto errout; | |
741 | ||
c89359a4 RP |
742 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
743 | rt->rt_nhn_alive--; | |
744 | ||
f8efb73c RP |
745 | rtnh = rtnh_next(rtnh, &remaining); |
746 | nhs++; | |
747 | } endfor_nexthops(rt); | |
748 | ||
749 | rt->rt_nhn = nhs; | |
750 | ||
751 | return 0; | |
752 | ||
753 | errout: | |
754 | return err; | |
755 | } | |
756 | ||
a2519929 EB |
757 | static int mpls_route_add(struct mpls_route_config *cfg) |
758 | { | |
19d0c341 | 759 | struct mpls_route __rcu **platform_label; |
a2519929 | 760 | struct net *net = cfg->rc_nlinfo.nl_net; |
a2519929 | 761 | struct mpls_route *rt, *old; |
a2519929 | 762 | int err = -EINVAL; |
cf4b24f0 | 763 | u8 max_via_alen; |
f8efb73c | 764 | unsigned index; |
cf4b24f0 | 765 | int nhs; |
a2519929 EB |
766 | |
767 | index = cfg->rc_label; | |
768 | ||
769 | /* If a label was not specified during insert pick one */ | |
770 | if ((index == LABEL_NOT_SPECIFIED) && | |
771 | (cfg->rc_nlflags & NLM_F_CREATE)) { | |
772 | index = find_free_label(net); | |
773 | } | |
774 | ||
a6affd24 RS |
775 | /* Reserved labels may not be set */ |
776 | if (index < MPLS_LABEL_FIRST_UNRESERVED) | |
a2519929 EB |
777 | goto errout; |
778 | ||
779 | /* The full 20 bit range may not be supported. */ | |
780 | if (index >= net->mpls.platform_labels) | |
781 | goto errout; | |
782 | ||
a2519929 | 783 | /* Append makes no sense with mpls */ |
0f7bbd58 | 784 | err = -EOPNOTSUPP; |
a2519929 EB |
785 | if (cfg->rc_nlflags & NLM_F_APPEND) |
786 | goto errout; | |
787 | ||
788 | err = -EEXIST; | |
19d0c341 EB |
789 | platform_label = rtnl_dereference(net->mpls.platform_label); |
790 | old = rtnl_dereference(platform_label[index]); | |
a2519929 EB |
791 | if ((cfg->rc_nlflags & NLM_F_EXCL) && old) |
792 | goto errout; | |
793 | ||
794 | err = -EEXIST; | |
795 | if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) | |
796 | goto errout; | |
797 | ||
798 | err = -ENOENT; | |
799 | if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) | |
800 | goto errout; | |
801 | ||
cf4b24f0 RS |
802 | err = -EINVAL; |
803 | nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, | |
804 | cfg->rc_via_alen, &max_via_alen); | |
805 | if (nhs == 0) | |
806 | goto errout; | |
f8efb73c | 807 | |
a2519929 | 808 | err = -ENOMEM; |
cf4b24f0 | 809 | rt = mpls_rt_alloc(nhs, max_via_alen); |
a2519929 EB |
810 | if (!rt) |
811 | goto errout; | |
812 | ||
a2519929 | 813 | rt->rt_protocol = cfg->rc_protocol; |
118d5234 | 814 | rt->rt_payload_type = cfg->rc_payload_type; |
a2519929 | 815 | |
f8efb73c RP |
816 | if (cfg->rc_mp) |
817 | err = mpls_nh_build_multi(cfg, rt); | |
818 | else | |
819 | err = mpls_nh_build_from_cfg(cfg, rt); | |
820 | if (err) | |
821 | goto freert; | |
822 | ||
823 | mpls_route_update(net, index, rt, &cfg->rc_nlinfo); | |
a2519929 | 824 | |
a2519929 EB |
825 | return 0; |
826 | ||
f8efb73c RP |
827 | freert: |
828 | mpls_rt_free(rt); | |
a2519929 | 829 | errout: |
a2519929 EB |
830 | return err; |
831 | } | |
832 | ||
833 | static int mpls_route_del(struct mpls_route_config *cfg) | |
834 | { | |
835 | struct net *net = cfg->rc_nlinfo.nl_net; | |
836 | unsigned index; | |
837 | int err = -EINVAL; | |
838 | ||
839 | index = cfg->rc_label; | |
840 | ||
a6affd24 RS |
841 | /* Reserved labels may not be removed */ |
842 | if (index < MPLS_LABEL_FIRST_UNRESERVED) | |
a2519929 EB |
843 | goto errout; |
844 | ||
845 | /* The full 20 bit range may not be supported */ | |
846 | if (index >= net->mpls.platform_labels) | |
847 | goto errout; | |
848 | ||
f8efb73c | 849 | mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); |
a2519929 EB |
850 | |
851 | err = 0; | |
852 | errout: | |
853 | return err; | |
854 | } | |
855 | ||
37bde799 RS |
856 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
857 | (&((struct mpls_dev *)0)->field) | |
858 | ||
859 | static const struct ctl_table mpls_dev_table[] = { | |
860 | { | |
861 | .procname = "input", | |
862 | .maxlen = sizeof(int), | |
863 | .mode = 0644, | |
864 | .proc_handler = proc_dointvec, | |
865 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), | |
866 | }, | |
867 | { } | |
868 | }; | |
869 | ||
870 | static int mpls_dev_sysctl_register(struct net_device *dev, | |
871 | struct mpls_dev *mdev) | |
872 | { | |
873 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; | |
874 | struct ctl_table *table; | |
875 | int i; | |
876 | ||
877 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); | |
878 | if (!table) | |
879 | goto out; | |
880 | ||
881 | /* Table data contains only offsets relative to the base of | |
882 | * the mdev at this point, so make them absolute. | |
883 | */ | |
884 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) | |
885 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; | |
886 | ||
887 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); | |
888 | ||
889 | mdev->sysctl = register_net_sysctl(dev_net(dev), path, table); | |
890 | if (!mdev->sysctl) | |
891 | goto free; | |
892 | ||
893 | return 0; | |
894 | ||
895 | free: | |
896 | kfree(table); | |
897 | out: | |
898 | return -ENOBUFS; | |
899 | } | |
900 | ||
901 | static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev) | |
902 | { | |
903 | struct ctl_table *table; | |
904 | ||
905 | table = mdev->sysctl->ctl_table_arg; | |
906 | unregister_net_sysctl_table(mdev->sysctl); | |
907 | kfree(table); | |
908 | } | |
909 | ||
03c57747 RS |
910 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
911 | { | |
912 | struct mpls_dev *mdev; | |
913 | int err = -ENOMEM; | |
914 | ||
915 | ASSERT_RTNL(); | |
916 | ||
917 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); | |
918 | if (!mdev) | |
919 | return ERR_PTR(err); | |
920 | ||
37bde799 RS |
921 | err = mpls_dev_sysctl_register(dev, mdev); |
922 | if (err) | |
923 | goto free; | |
924 | ||
03c57747 RS |
925 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
926 | ||
927 | return mdev; | |
37bde799 RS |
928 | |
929 | free: | |
930 | kfree(mdev); | |
931 | return ERR_PTR(err); | |
03c57747 RS |
932 | } |
933 | ||
c89359a4 | 934 | static void mpls_ifdown(struct net_device *dev, int event) |
0189197f | 935 | { |
19d0c341 | 936 | struct mpls_route __rcu **platform_label; |
0189197f EB |
937 | struct net *net = dev_net(dev); |
938 | unsigned index; | |
939 | ||
19d0c341 | 940 | platform_label = rtnl_dereference(net->mpls.platform_label); |
0189197f | 941 | for (index = 0; index < net->mpls.platform_labels; index++) { |
19d0c341 | 942 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
c89359a4 | 943 | |
0189197f EB |
944 | if (!rt) |
945 | continue; | |
c89359a4 RP |
946 | |
947 | change_nexthops(rt) { | |
f8efb73c RP |
948 | if (rtnl_dereference(nh->nh_dev) != dev) |
949 | continue; | |
c89359a4 RP |
950 | switch (event) { |
951 | case NETDEV_DOWN: | |
952 | case NETDEV_UNREGISTER: | |
953 | nh->nh_flags |= RTNH_F_DEAD; | |
954 | /* fall through */ | |
955 | case NETDEV_CHANGE: | |
956 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
957 | ACCESS_ONCE(rt->rt_nhn_alive) = rt->rt_nhn_alive - 1; | |
958 | break; | |
959 | } | |
960 | if (event == NETDEV_UNREGISTER) | |
961 | RCU_INIT_POINTER(nh->nh_dev, NULL); | |
f8efb73c | 962 | } endfor_nexthops(rt); |
0189197f | 963 | } |
03c57747 | 964 | |
03c57747 | 965 | |
c89359a4 RP |
966 | return; |
967 | } | |
968 | ||
969 | static void mpls_ifup(struct net_device *dev, unsigned int nh_flags) | |
970 | { | |
971 | struct mpls_route __rcu **platform_label; | |
972 | struct net *net = dev_net(dev); | |
973 | unsigned index; | |
974 | int alive; | |
975 | ||
976 | platform_label = rtnl_dereference(net->mpls.platform_label); | |
977 | for (index = 0; index < net->mpls.platform_labels; index++) { | |
978 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
979 | ||
980 | if (!rt) | |
981 | continue; | |
37bde799 | 982 | |
c89359a4 RP |
983 | alive = 0; |
984 | change_nexthops(rt) { | |
985 | struct net_device *nh_dev = | |
986 | rtnl_dereference(nh->nh_dev); | |
03c57747 | 987 | |
c89359a4 RP |
988 | if (!(nh->nh_flags & nh_flags)) { |
989 | alive++; | |
990 | continue; | |
991 | } | |
992 | if (nh_dev != dev) | |
993 | continue; | |
994 | alive++; | |
995 | nh->nh_flags &= ~nh_flags; | |
996 | } endfor_nexthops(rt); | |
997 | ||
998 | ACCESS_ONCE(rt->rt_nhn_alive) = alive; | |
999 | } | |
1000 | ||
1001 | return; | |
0189197f EB |
1002 | } |
1003 | ||
1004 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, | |
1005 | void *ptr) | |
1006 | { | |
1007 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
03c57747 | 1008 | struct mpls_dev *mdev; |
c89359a4 | 1009 | unsigned int flags; |
0189197f | 1010 | |
c89359a4 | 1011 | if (event == NETDEV_REGISTER) { |
407f31be | 1012 | /* For now just support Ethernet, IPGRE, SIT and IPIP devices */ |
0d227a86 SH |
1013 | if (dev->type == ARPHRD_ETHER || |
1014 | dev->type == ARPHRD_LOOPBACK || | |
407f31be SH |
1015 | dev->type == ARPHRD_IPGRE || |
1016 | dev->type == ARPHRD_SIT || | |
1017 | dev->type == ARPHRD_TUNNEL) { | |
03c57747 RS |
1018 | mdev = mpls_add_dev(dev); |
1019 | if (IS_ERR(mdev)) | |
1020 | return notifier_from_errno(PTR_ERR(mdev)); | |
1021 | } | |
c89359a4 RP |
1022 | return NOTIFY_OK; |
1023 | } | |
03c57747 | 1024 | |
c89359a4 RP |
1025 | mdev = mpls_dev_get(dev); |
1026 | if (!mdev) | |
1027 | return NOTIFY_OK; | |
1028 | ||
1029 | switch (event) { | |
1030 | case NETDEV_DOWN: | |
1031 | mpls_ifdown(dev, event); | |
1032 | break; | |
1033 | case NETDEV_UP: | |
1034 | flags = dev_get_flags(dev); | |
1035 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1036 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1037 | else | |
1038 | mpls_ifup(dev, RTNH_F_DEAD); | |
1039 | break; | |
1040 | case NETDEV_CHANGE: | |
1041 | flags = dev_get_flags(dev); | |
1042 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1043 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); | |
1044 | else | |
1045 | mpls_ifdown(dev, event); | |
1046 | break; | |
0189197f | 1047 | case NETDEV_UNREGISTER: |
c89359a4 RP |
1048 | mpls_ifdown(dev, event); |
1049 | mdev = mpls_dev_get(dev); | |
1050 | if (mdev) { | |
1051 | mpls_dev_sysctl_unregister(mdev); | |
1052 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); | |
1053 | kfree_rcu(mdev, rcu); | |
1054 | } | |
0189197f | 1055 | break; |
0fae3bf0 RS |
1056 | case NETDEV_CHANGENAME: |
1057 | mdev = mpls_dev_get(dev); | |
1058 | if (mdev) { | |
1059 | int err; | |
1060 | ||
1061 | mpls_dev_sysctl_unregister(mdev); | |
1062 | err = mpls_dev_sysctl_register(dev, mdev); | |
1063 | if (err) | |
1064 | return notifier_from_errno(err); | |
1065 | } | |
1066 | break; | |
0189197f EB |
1067 | } |
1068 | return NOTIFY_OK; | |
1069 | } | |
1070 | ||
1071 | static struct notifier_block mpls_dev_notifier = { | |
1072 | .notifier_call = mpls_dev_notify, | |
1073 | }; | |
1074 | ||
03c05665 | 1075 | static int nla_put_via(struct sk_buff *skb, |
b79bda3d | 1076 | u8 table, const void *addr, int alen) |
03c05665 | 1077 | { |
b79bda3d EB |
1078 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
1079 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, | |
1080 | }; | |
03c05665 EB |
1081 | struct nlattr *nla; |
1082 | struct rtvia *via; | |
b79bda3d | 1083 | int family = AF_UNSPEC; |
03c05665 EB |
1084 | |
1085 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
1086 | if (!nla) | |
1087 | return -EMSGSIZE; | |
1088 | ||
b79bda3d EB |
1089 | if (table <= NEIGH_NR_TABLES) |
1090 | family = table_to_family[table]; | |
1091 | ||
03c05665 EB |
1092 | via = nla_data(nla); |
1093 | via->rtvia_family = family; | |
1094 | memcpy(via->rtvia_addr, addr, alen); | |
1095 | return 0; | |
1096 | } | |
1097 | ||
966bae33 EB |
1098 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
1099 | u8 labels, const u32 label[]) | |
1100 | { | |
1101 | struct nlattr *nla; | |
1102 | struct mpls_shim_hdr *nla_label; | |
1103 | bool bos; | |
1104 | int i; | |
1105 | nla = nla_reserve(skb, attrtype, labels*4); | |
1106 | if (!nla) | |
1107 | return -EMSGSIZE; | |
1108 | ||
1109 | nla_label = nla_data(nla); | |
1110 | bos = true; | |
1111 | for (i = labels - 1; i >= 0; i--) { | |
1112 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); | |
1113 | bos = false; | |
1114 | } | |
1115 | ||
1116 | return 0; | |
1117 | } | |
face0188 | 1118 | EXPORT_SYMBOL_GPL(nla_put_labels); |
966bae33 EB |
1119 | |
1120 | int nla_get_labels(const struct nlattr *nla, | |
f8efb73c | 1121 | u32 max_labels, u8 *labels, u32 label[]) |
966bae33 EB |
1122 | { |
1123 | unsigned len = nla_len(nla); | |
1124 | unsigned nla_labels; | |
1125 | struct mpls_shim_hdr *nla_label; | |
1126 | bool bos; | |
1127 | int i; | |
1128 | ||
1129 | /* len needs to be an even multiple of 4 (the label size) */ | |
1130 | if (len & 3) | |
1131 | return -EINVAL; | |
1132 | ||
1133 | /* Limit the number of new labels allowed */ | |
1134 | nla_labels = len/4; | |
1135 | if (nla_labels > max_labels) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | nla_label = nla_data(nla); | |
1139 | bos = true; | |
1140 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { | |
1141 | struct mpls_entry_decoded dec; | |
1142 | dec = mpls_entry_decode(nla_label + i); | |
1143 | ||
1144 | /* Ensure the bottom of stack flag is properly set | |
1145 | * and ttl and tc are both clear. | |
1146 | */ | |
1147 | if ((dec.bos != bos) || dec.ttl || dec.tc) | |
1148 | return -EINVAL; | |
1149 | ||
5a9ab017 | 1150 | switch (dec.label) { |
78f5b899 | 1151 | case MPLS_LABEL_IMPLNULL: |
5a9ab017 RS |
1152 | /* RFC3032: This is a label that an LSR may |
1153 | * assign and distribute, but which never | |
1154 | * actually appears in the encapsulation. | |
1155 | */ | |
1156 | return -EINVAL; | |
1157 | } | |
1158 | ||
966bae33 EB |
1159 | label[i] = dec.label; |
1160 | } | |
1161 | *labels = nla_labels; | |
1162 | return 0; | |
1163 | } | |
face0188 | 1164 | EXPORT_SYMBOL_GPL(nla_get_labels); |
966bae33 | 1165 | |
f8efb73c RP |
1166 | int nla_get_via(const struct nlattr *nla, u8 *via_alen, |
1167 | u8 *via_table, u8 via_addr[]) | |
1168 | { | |
1169 | struct rtvia *via = nla_data(nla); | |
1170 | int err = -EINVAL; | |
1171 | int alen; | |
1172 | ||
1173 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) | |
1174 | goto errout; | |
1175 | alen = nla_len(nla) - | |
1176 | offsetof(struct rtvia, rtvia_addr); | |
1177 | if (alen > MAX_VIA_ALEN) | |
1178 | goto errout; | |
1179 | ||
1180 | /* Validate the address family */ | |
1181 | switch (via->rtvia_family) { | |
1182 | case AF_PACKET: | |
1183 | *via_table = NEIGH_LINK_TABLE; | |
1184 | break; | |
1185 | case AF_INET: | |
1186 | *via_table = NEIGH_ARP_TABLE; | |
1187 | if (alen != 4) | |
1188 | goto errout; | |
1189 | break; | |
1190 | case AF_INET6: | |
1191 | *via_table = NEIGH_ND_TABLE; | |
1192 | if (alen != 16) | |
1193 | goto errout; | |
1194 | break; | |
1195 | default: | |
1196 | /* Unsupported address family */ | |
1197 | goto errout; | |
1198 | } | |
1199 | ||
1200 | memcpy(via_addr, via->rtvia_addr, alen); | |
1201 | *via_alen = alen; | |
1202 | err = 0; | |
1203 | ||
1204 | errout: | |
1205 | return err; | |
1206 | } | |
1207 | ||
03c05665 EB |
1208 | static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, |
1209 | struct mpls_route_config *cfg) | |
1210 | { | |
1211 | struct rtmsg *rtm; | |
1212 | struct nlattr *tb[RTA_MAX+1]; | |
1213 | int index; | |
1214 | int err; | |
1215 | ||
1216 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy); | |
1217 | if (err < 0) | |
1218 | goto errout; | |
1219 | ||
1220 | err = -EINVAL; | |
1221 | rtm = nlmsg_data(nlh); | |
1222 | memset(cfg, 0, sizeof(*cfg)); | |
1223 | ||
1224 | if (rtm->rtm_family != AF_MPLS) | |
1225 | goto errout; | |
1226 | if (rtm->rtm_dst_len != 20) | |
1227 | goto errout; | |
1228 | if (rtm->rtm_src_len != 0) | |
1229 | goto errout; | |
1230 | if (rtm->rtm_tos != 0) | |
1231 | goto errout; | |
1232 | if (rtm->rtm_table != RT_TABLE_MAIN) | |
1233 | goto errout; | |
1234 | /* Any value is acceptable for rtm_protocol */ | |
1235 | ||
1236 | /* As mpls uses destination specific addresses | |
1237 | * (or source specific address in the case of multicast) | |
1238 | * all addresses have universal scope. | |
1239 | */ | |
1240 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) | |
1241 | goto errout; | |
1242 | if (rtm->rtm_type != RTN_UNICAST) | |
1243 | goto errout; | |
1244 | if (rtm->rtm_flags != 0) | |
1245 | goto errout; | |
1246 | ||
1247 | cfg->rc_label = LABEL_NOT_SPECIFIED; | |
1248 | cfg->rc_protocol = rtm->rtm_protocol; | |
eb7809f0 | 1249 | cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
03c05665 EB |
1250 | cfg->rc_nlflags = nlh->nlmsg_flags; |
1251 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; | |
1252 | cfg->rc_nlinfo.nlh = nlh; | |
1253 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); | |
1254 | ||
1255 | for (index = 0; index <= RTA_MAX; index++) { | |
1256 | struct nlattr *nla = tb[index]; | |
1257 | if (!nla) | |
1258 | continue; | |
1259 | ||
1260 | switch(index) { | |
1261 | case RTA_OIF: | |
1262 | cfg->rc_ifindex = nla_get_u32(nla); | |
1263 | break; | |
1264 | case RTA_NEWDST: | |
1265 | if (nla_get_labels(nla, MAX_NEW_LABELS, | |
1266 | &cfg->rc_output_labels, | |
1267 | cfg->rc_output_label)) | |
1268 | goto errout; | |
1269 | break; | |
1270 | case RTA_DST: | |
1271 | { | |
f8efb73c | 1272 | u8 label_count; |
03c05665 EB |
1273 | if (nla_get_labels(nla, 1, &label_count, |
1274 | &cfg->rc_label)) | |
1275 | goto errout; | |
1276 | ||
a6affd24 RS |
1277 | /* Reserved labels may not be set */ |
1278 | if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) | |
03c05665 EB |
1279 | goto errout; |
1280 | ||
1281 | break; | |
1282 | } | |
1283 | case RTA_VIA: | |
1284 | { | |
f8efb73c RP |
1285 | if (nla_get_via(nla, &cfg->rc_via_alen, |
1286 | &cfg->rc_via_table, cfg->rc_via)) | |
03c05665 | 1287 | goto errout; |
f8efb73c RP |
1288 | break; |
1289 | } | |
1290 | case RTA_MULTIPATH: | |
1291 | { | |
1292 | cfg->rc_mp = nla_data(nla); | |
1293 | cfg->rc_mp_len = nla_len(nla); | |
03c05665 EB |
1294 | break; |
1295 | } | |
1296 | default: | |
1297 | /* Unsupported attribute */ | |
1298 | goto errout; | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | err = 0; | |
1303 | errout: | |
1304 | return err; | |
1305 | } | |
1306 | ||
1307 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1308 | { | |
1309 | struct mpls_route_config cfg; | |
1310 | int err; | |
1311 | ||
1312 | err = rtm_to_route_config(skb, nlh, &cfg); | |
1313 | if (err < 0) | |
1314 | return err; | |
1315 | ||
1316 | return mpls_route_del(&cfg); | |
1317 | } | |
1318 | ||
1319 | ||
1320 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1321 | { | |
1322 | struct mpls_route_config cfg; | |
1323 | int err; | |
1324 | ||
1325 | err = rtm_to_route_config(skb, nlh, &cfg); | |
1326 | if (err < 0) | |
1327 | return err; | |
1328 | ||
1329 | return mpls_route_add(&cfg); | |
1330 | } | |
1331 | ||
1332 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, | |
1333 | u32 label, struct mpls_route *rt, int flags) | |
1334 | { | |
19d0c341 | 1335 | struct net_device *dev; |
03c05665 EB |
1336 | struct nlmsghdr *nlh; |
1337 | struct rtmsg *rtm; | |
1338 | ||
1339 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); | |
1340 | if (nlh == NULL) | |
1341 | return -EMSGSIZE; | |
1342 | ||
1343 | rtm = nlmsg_data(nlh); | |
1344 | rtm->rtm_family = AF_MPLS; | |
1345 | rtm->rtm_dst_len = 20; | |
1346 | rtm->rtm_src_len = 0; | |
1347 | rtm->rtm_tos = 0; | |
1348 | rtm->rtm_table = RT_TABLE_MAIN; | |
1349 | rtm->rtm_protocol = rt->rt_protocol; | |
1350 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1351 | rtm->rtm_type = RTN_UNICAST; | |
1352 | rtm->rtm_flags = 0; | |
1353 | ||
03c05665 EB |
1354 | if (nla_put_labels(skb, RTA_DST, 1, &label)) |
1355 | goto nla_put_failure; | |
f8efb73c | 1356 | if (rt->rt_nhn == 1) { |
cf4b24f0 | 1357 | const struct mpls_nh *nh = rt->rt_nh; |
f8efb73c RP |
1358 | |
1359 | if (nh->nh_labels && | |
1360 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, | |
1361 | nh->nh_label)) | |
1362 | goto nla_put_failure; | |
eb7809f0 | 1363 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
72dcac96 | 1364 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
f8efb73c RP |
1365 | nh->nh_via_alen)) |
1366 | goto nla_put_failure; | |
1367 | dev = rtnl_dereference(nh->nh_dev); | |
1368 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
1369 | goto nla_put_failure; | |
c89359a4 RP |
1370 | if (nh->nh_flags & RTNH_F_LINKDOWN) |
1371 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
1372 | if (nh->nh_flags & RTNH_F_DEAD) | |
1373 | rtm->rtm_flags |= RTNH_F_DEAD; | |
f8efb73c RP |
1374 | } else { |
1375 | struct rtnexthop *rtnh; | |
1376 | struct nlattr *mp; | |
c89359a4 RP |
1377 | int dead = 0; |
1378 | int linkdown = 0; | |
f8efb73c RP |
1379 | |
1380 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
1381 | if (!mp) | |
1382 | goto nla_put_failure; | |
1383 | ||
1384 | for_nexthops(rt) { | |
1385 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
1386 | if (!rtnh) | |
1387 | goto nla_put_failure; | |
1388 | ||
1389 | dev = rtnl_dereference(nh->nh_dev); | |
1390 | if (dev) | |
1391 | rtnh->rtnh_ifindex = dev->ifindex; | |
c89359a4 RP |
1392 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
1393 | rtnh->rtnh_flags |= RTNH_F_LINKDOWN; | |
1394 | linkdown++; | |
1395 | } | |
1396 | if (nh->nh_flags & RTNH_F_DEAD) { | |
1397 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
1398 | dead++; | |
1399 | } | |
1400 | ||
f8efb73c RP |
1401 | if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, |
1402 | nh->nh_labels, | |
1403 | nh->nh_label)) | |
1404 | goto nla_put_failure; | |
f20367df RS |
1405 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
1406 | nla_put_via(skb, nh->nh_via_table, | |
cf4b24f0 | 1407 | mpls_nh_via(rt, nh), |
f8efb73c RP |
1408 | nh->nh_via_alen)) |
1409 | goto nla_put_failure; | |
1410 | ||
1411 | /* length of rtnetlink header + attributes */ | |
1412 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
1413 | } endfor_nexthops(rt); | |
1414 | ||
c89359a4 RP |
1415 | if (linkdown == rt->rt_nhn) |
1416 | rtm->rtm_flags |= RTNH_F_LINKDOWN; | |
1417 | if (dead == rt->rt_nhn) | |
1418 | rtm->rtm_flags |= RTNH_F_DEAD; | |
1419 | ||
f8efb73c RP |
1420 | nla_nest_end(skb, mp); |
1421 | } | |
03c05665 EB |
1422 | |
1423 | nlmsg_end(skb, nlh); | |
1424 | return 0; | |
1425 | ||
1426 | nla_put_failure: | |
1427 | nlmsg_cancel(skb, nlh); | |
1428 | return -EMSGSIZE; | |
1429 | } | |
1430 | ||
1431 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) | |
1432 | { | |
1433 | struct net *net = sock_net(skb->sk); | |
19d0c341 EB |
1434 | struct mpls_route __rcu **platform_label; |
1435 | size_t platform_labels; | |
03c05665 EB |
1436 | unsigned int index; |
1437 | ||
1438 | ASSERT_RTNL(); | |
1439 | ||
1440 | index = cb->args[0]; | |
a6affd24 RS |
1441 | if (index < MPLS_LABEL_FIRST_UNRESERVED) |
1442 | index = MPLS_LABEL_FIRST_UNRESERVED; | |
03c05665 | 1443 | |
19d0c341 EB |
1444 | platform_label = rtnl_dereference(net->mpls.platform_label); |
1445 | platform_labels = net->mpls.platform_labels; | |
1446 | for (; index < platform_labels; index++) { | |
03c05665 | 1447 | struct mpls_route *rt; |
19d0c341 | 1448 | rt = rtnl_dereference(platform_label[index]); |
03c05665 EB |
1449 | if (!rt) |
1450 | continue; | |
1451 | ||
1452 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, | |
1453 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, | |
1454 | index, rt, NLM_F_MULTI) < 0) | |
1455 | break; | |
1456 | } | |
1457 | cb->args[0] = index; | |
1458 | ||
1459 | return skb->len; | |
1460 | } | |
1461 | ||
8de147dc EB |
1462 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
1463 | { | |
1464 | size_t payload = | |
1465 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
8de147dc | 1466 | + nla_total_size(4); /* RTA_DST */ |
f8efb73c RP |
1467 | |
1468 | if (rt->rt_nhn == 1) { | |
1469 | struct mpls_nh *nh = rt->rt_nh; | |
1470 | ||
1471 | if (nh->nh_dev) | |
1472 | payload += nla_total_size(4); /* RTA_OIF */ | |
eb7809f0 | 1473 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ |
72dcac96 | 1474 | payload += nla_total_size(2 + nh->nh_via_alen); |
f8efb73c RP |
1475 | if (nh->nh_labels) /* RTA_NEWDST */ |
1476 | payload += nla_total_size(nh->nh_labels * 4); | |
1477 | } else { | |
1478 | /* each nexthop is packed in an attribute */ | |
1479 | size_t nhsize = 0; | |
1480 | ||
1481 | for_nexthops(rt) { | |
1482 | nhsize += nla_total_size(sizeof(struct rtnexthop)); | |
f20367df RS |
1483 | /* RTA_VIA */ |
1484 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) | |
1485 | nhsize += nla_total_size(2 + nh->nh_via_alen); | |
f8efb73c RP |
1486 | if (nh->nh_labels) |
1487 | nhsize += nla_total_size(nh->nh_labels * 4); | |
1488 | } endfor_nexthops(rt); | |
1489 | /* nested attribute */ | |
1490 | payload += nla_total_size(nhsize); | |
1491 | } | |
1492 | ||
8de147dc EB |
1493 | return payload; |
1494 | } | |
1495 | ||
1496 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, | |
1497 | struct nlmsghdr *nlh, struct net *net, u32 portid, | |
1498 | unsigned int nlm_flags) | |
1499 | { | |
1500 | struct sk_buff *skb; | |
1501 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
1502 | int err = -ENOBUFS; | |
1503 | ||
1504 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); | |
1505 | if (skb == NULL) | |
1506 | goto errout; | |
1507 | ||
1508 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); | |
1509 | if (err < 0) { | |
1510 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ | |
1511 | WARN_ON(err == -EMSGSIZE); | |
1512 | kfree_skb(skb); | |
1513 | goto errout; | |
1514 | } | |
1515 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); | |
1516 | ||
1517 | return; | |
1518 | errout: | |
1519 | if (err < 0) | |
1520 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); | |
1521 | } | |
1522 | ||
7720c01f EB |
1523 | static int resize_platform_label_table(struct net *net, size_t limit) |
1524 | { | |
1525 | size_t size = sizeof(struct mpls_route *) * limit; | |
1526 | size_t old_limit; | |
1527 | size_t cp_size; | |
1528 | struct mpls_route __rcu **labels = NULL, **old; | |
1529 | struct mpls_route *rt0 = NULL, *rt2 = NULL; | |
1530 | unsigned index; | |
1531 | ||
1532 | if (size) { | |
1533 | labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); | |
1534 | if (!labels) | |
1535 | labels = vzalloc(size); | |
1536 | ||
1537 | if (!labels) | |
1538 | goto nolabels; | |
1539 | } | |
1540 | ||
1541 | /* In case the predefined labels need to be populated */ | |
78f5b899 | 1542 | if (limit > MPLS_LABEL_IPV4NULL) { |
7720c01f | 1543 | struct net_device *lo = net->loopback_dev; |
cf4b24f0 | 1544 | rt0 = mpls_rt_alloc(1, lo->addr_len); |
7720c01f EB |
1545 | if (!rt0) |
1546 | goto nort0; | |
f8efb73c | 1547 | RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); |
7720c01f | 1548 | rt0->rt_protocol = RTPROT_KERNEL; |
118d5234 | 1549 | rt0->rt_payload_type = MPT_IPV4; |
f8efb73c | 1550 | rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 1551 | rt0->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
1552 | memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, |
1553 | lo->addr_len); | |
7720c01f | 1554 | } |
78f5b899 | 1555 | if (limit > MPLS_LABEL_IPV6NULL) { |
7720c01f | 1556 | struct net_device *lo = net->loopback_dev; |
cf4b24f0 | 1557 | rt2 = mpls_rt_alloc(1, lo->addr_len); |
7720c01f EB |
1558 | if (!rt2) |
1559 | goto nort2; | |
f8efb73c | 1560 | RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); |
7720c01f | 1561 | rt2->rt_protocol = RTPROT_KERNEL; |
118d5234 | 1562 | rt2->rt_payload_type = MPT_IPV6; |
f8efb73c | 1563 | rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
b4e04fc7 | 1564 | rt2->rt_nh->nh_via_alen = lo->addr_len; |
cf4b24f0 RS |
1565 | memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, |
1566 | lo->addr_len); | |
7720c01f EB |
1567 | } |
1568 | ||
1569 | rtnl_lock(); | |
1570 | /* Remember the original table */ | |
19d0c341 | 1571 | old = rtnl_dereference(net->mpls.platform_label); |
7720c01f EB |
1572 | old_limit = net->mpls.platform_labels; |
1573 | ||
1574 | /* Free any labels beyond the new table */ | |
1575 | for (index = limit; index < old_limit; index++) | |
f8efb73c | 1576 | mpls_route_update(net, index, NULL, NULL); |
7720c01f EB |
1577 | |
1578 | /* Copy over the old labels */ | |
1579 | cp_size = size; | |
1580 | if (old_limit < limit) | |
1581 | cp_size = old_limit * sizeof(struct mpls_route *); | |
1582 | ||
1583 | memcpy(labels, old, cp_size); | |
1584 | ||
1585 | /* If needed set the predefined labels */ | |
78f5b899 TH |
1586 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
1587 | (limit > MPLS_LABEL_IPV6NULL)) { | |
1588 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); | |
7720c01f EB |
1589 | rt2 = NULL; |
1590 | } | |
1591 | ||
78f5b899 TH |
1592 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
1593 | (limit > MPLS_LABEL_IPV4NULL)) { | |
1594 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); | |
7720c01f EB |
1595 | rt0 = NULL; |
1596 | } | |
1597 | ||
1598 | /* Update the global pointers */ | |
1599 | net->mpls.platform_labels = limit; | |
19d0c341 | 1600 | rcu_assign_pointer(net->mpls.platform_label, labels); |
7720c01f EB |
1601 | |
1602 | rtnl_unlock(); | |
1603 | ||
1604 | mpls_rt_free(rt2); | |
1605 | mpls_rt_free(rt0); | |
1606 | ||
1607 | if (old) { | |
1608 | synchronize_rcu(); | |
1609 | kvfree(old); | |
1610 | } | |
1611 | return 0; | |
1612 | ||
1613 | nort2: | |
1614 | mpls_rt_free(rt0); | |
1615 | nort0: | |
1616 | kvfree(labels); | |
1617 | nolabels: | |
1618 | return -ENOMEM; | |
1619 | } | |
1620 | ||
1621 | static int mpls_platform_labels(struct ctl_table *table, int write, | |
1622 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1623 | { | |
1624 | struct net *net = table->data; | |
1625 | int platform_labels = net->mpls.platform_labels; | |
1626 | int ret; | |
1627 | struct ctl_table tmp = { | |
1628 | .procname = table->procname, | |
1629 | .data = &platform_labels, | |
1630 | .maxlen = sizeof(int), | |
1631 | .mode = table->mode, | |
1632 | .extra1 = &zero, | |
1633 | .extra2 = &label_limit, | |
1634 | }; | |
1635 | ||
1636 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1637 | ||
1638 | if (write && ret == 0) | |
1639 | ret = resize_platform_label_table(net, platform_labels); | |
1640 | ||
1641 | return ret; | |
1642 | } | |
1643 | ||
37bde799 | 1644 | static const struct ctl_table mpls_table[] = { |
7720c01f EB |
1645 | { |
1646 | .procname = "platform_labels", | |
1647 | .data = NULL, | |
1648 | .maxlen = sizeof(int), | |
1649 | .mode = 0644, | |
1650 | .proc_handler = mpls_platform_labels, | |
1651 | }, | |
1652 | { } | |
1653 | }; | |
1654 | ||
0189197f EB |
1655 | static int mpls_net_init(struct net *net) |
1656 | { | |
7720c01f EB |
1657 | struct ctl_table *table; |
1658 | ||
0189197f EB |
1659 | net->mpls.platform_labels = 0; |
1660 | net->mpls.platform_label = NULL; | |
1661 | ||
7720c01f EB |
1662 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
1663 | if (table == NULL) | |
1664 | return -ENOMEM; | |
1665 | ||
1666 | table[0].data = net; | |
1667 | net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); | |
6ea3c9d5 NA |
1668 | if (net->mpls.ctl == NULL) { |
1669 | kfree(table); | |
7720c01f | 1670 | return -ENOMEM; |
6ea3c9d5 | 1671 | } |
7720c01f | 1672 | |
0189197f EB |
1673 | return 0; |
1674 | } | |
1675 | ||
1676 | static void mpls_net_exit(struct net *net) | |
1677 | { | |
19d0c341 EB |
1678 | struct mpls_route __rcu **platform_label; |
1679 | size_t platform_labels; | |
7720c01f | 1680 | struct ctl_table *table; |
0189197f EB |
1681 | unsigned int index; |
1682 | ||
7720c01f EB |
1683 | table = net->mpls.ctl->ctl_table_arg; |
1684 | unregister_net_sysctl_table(net->mpls.ctl); | |
1685 | kfree(table); | |
1686 | ||
19d0c341 EB |
1687 | /* An rcu grace period has passed since there was a device in |
1688 | * the network namespace (and thus the last in flight packet) | |
0189197f EB |
1689 | * left this network namespace. This is because |
1690 | * unregister_netdevice_many and netdev_run_todo has completed | |
1691 | * for each network device that was in this network namespace. | |
1692 | * | |
1693 | * As such no additional rcu synchronization is necessary when | |
1694 | * freeing the platform_label table. | |
1695 | */ | |
1696 | rtnl_lock(); | |
19d0c341 EB |
1697 | platform_label = rtnl_dereference(net->mpls.platform_label); |
1698 | platform_labels = net->mpls.platform_labels; | |
1699 | for (index = 0; index < platform_labels; index++) { | |
1700 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); | |
1701 | RCU_INIT_POINTER(platform_label[index], NULL); | |
0189197f EB |
1702 | mpls_rt_free(rt); |
1703 | } | |
1704 | rtnl_unlock(); | |
1705 | ||
19d0c341 | 1706 | kvfree(platform_label); |
0189197f EB |
1707 | } |
1708 | ||
1709 | static struct pernet_operations mpls_net_ops = { | |
1710 | .init = mpls_net_init, | |
1711 | .exit = mpls_net_exit, | |
1712 | }; | |
1713 | ||
1714 | static int __init mpls_init(void) | |
1715 | { | |
1716 | int err; | |
1717 | ||
1718 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); | |
1719 | ||
1720 | err = register_pernet_subsys(&mpls_net_ops); | |
1721 | if (err) | |
1722 | goto out; | |
1723 | ||
1724 | err = register_netdevice_notifier(&mpls_dev_notifier); | |
1725 | if (err) | |
1726 | goto out_unregister_pernet; | |
1727 | ||
1728 | dev_add_pack(&mpls_packet_type); | |
1729 | ||
03c05665 EB |
1730 | rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); |
1731 | rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); | |
1732 | rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); | |
0189197f EB |
1733 | err = 0; |
1734 | out: | |
1735 | return err; | |
1736 | ||
1737 | out_unregister_pernet: | |
1738 | unregister_pernet_subsys(&mpls_net_ops); | |
1739 | goto out; | |
1740 | } | |
1741 | module_init(mpls_init); | |
1742 | ||
1743 | static void __exit mpls_exit(void) | |
1744 | { | |
03c05665 | 1745 | rtnl_unregister_all(PF_MPLS); |
0189197f EB |
1746 | dev_remove_pack(&mpls_packet_type); |
1747 | unregister_netdevice_notifier(&mpls_dev_notifier); | |
1748 | unregister_pernet_subsys(&mpls_net_ops); | |
1749 | } | |
1750 | module_exit(mpls_exit); | |
1751 | ||
1752 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); | |
1753 | MODULE_LICENSE("GPL v2"); | |
1754 | MODULE_ALIAS_NETPROTO(PF_MPLS); |