Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * IPv4 Forwarding Information Base: semantics. | |
7 | * | |
1da177e4 LT |
8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
7c0f6ba6 | 16 | #include <linux/uaccess.h> |
1da177e4 LT |
17 | #include <linux/bitops.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/inet.h> | |
14c85021 | 28 | #include <linux/inetdevice.h> |
1da177e4 LT |
29 | #include <linux/netdevice.h> |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/skbuff.h> | |
1da177e4 | 33 | #include <linux/init.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
c3ab2b4e | 35 | #include <linux/netlink.h> |
1da177e4 | 36 | |
14c85021 | 37 | #include <net/arp.h> |
1da177e4 LT |
38 | #include <net/ip.h> |
39 | #include <net/protocol.h> | |
40 | #include <net/route.h> | |
41 | #include <net/tcp.h> | |
42 | #include <net/sock.h> | |
43 | #include <net/ip_fib.h> | |
f21c7bc5 | 44 | #include <net/netlink.h> |
4e902c57 | 45 | #include <net/nexthop.h> |
571e7226 | 46 | #include <net/lwtunnel.h> |
04b1d4e5 | 47 | #include <net/fib_notifier.h> |
1da177e4 LT |
48 | |
49 | #include "fib_lookup.h" | |
50 | ||
832b4c5e | 51 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
52 | static struct hlist_head *fib_info_hash; |
53 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 54 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
55 | static unsigned int fib_info_cnt; |
56 | ||
57 | #define DEVINDEX_HASHBITS 8 | |
58 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
59 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
60 | ||
61 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1da177e4 | 62 | |
6a31d2a9 ED |
63 | #define for_nexthops(fi) { \ |
64 | int nhsel; const struct fib_nh *nh; \ | |
65 | for (nhsel = 0, nh = (fi)->fib_nh; \ | |
66 | nhsel < (fi)->fib_nhs; \ | |
67 | nh++, nhsel++) | |
68 | ||
69 | #define change_nexthops(fi) { \ | |
70 | int nhsel; struct fib_nh *nexthop_nh; \ | |
71 | for (nhsel = 0, nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
72 | nhsel < (fi)->fib_nhs; \ | |
73 | nexthop_nh++, nhsel++) | |
1da177e4 LT |
74 | |
75 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
76 | ||
77 | /* Hope, that gcc will optimize it to get rid of dummy loop */ | |
78 | ||
6a31d2a9 ED |
79 | #define for_nexthops(fi) { \ |
80 | int nhsel; const struct fib_nh *nh = (fi)->fib_nh; \ | |
81 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 | 82 | |
6a31d2a9 ED |
83 | #define change_nexthops(fi) { \ |
84 | int nhsel; \ | |
85 | struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
86 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 LT |
87 | |
88 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
89 | ||
90 | #define endfor_nexthops(fi) } | |
91 | ||
92 | ||
3be0686b | 93 | const struct fib_prop fib_props[RTN_MAX + 1] = { |
6a31d2a9 | 94 | [RTN_UNSPEC] = { |
1da177e4 LT |
95 | .error = 0, |
96 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
97 | }, |
98 | [RTN_UNICAST] = { | |
1da177e4 LT |
99 | .error = 0, |
100 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
101 | }, |
102 | [RTN_LOCAL] = { | |
1da177e4 LT |
103 | .error = 0, |
104 | .scope = RT_SCOPE_HOST, | |
6a31d2a9 ED |
105 | }, |
106 | [RTN_BROADCAST] = { | |
1da177e4 LT |
107 | .error = 0, |
108 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
109 | }, |
110 | [RTN_ANYCAST] = { | |
1da177e4 LT |
111 | .error = 0, |
112 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
113 | }, |
114 | [RTN_MULTICAST] = { | |
1da177e4 LT |
115 | .error = 0, |
116 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
117 | }, |
118 | [RTN_BLACKHOLE] = { | |
1da177e4 LT |
119 | .error = -EINVAL, |
120 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
121 | }, |
122 | [RTN_UNREACHABLE] = { | |
1da177e4 LT |
123 | .error = -EHOSTUNREACH, |
124 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
125 | }, |
126 | [RTN_PROHIBIT] = { | |
1da177e4 LT |
127 | .error = -EACCES, |
128 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
129 | }, |
130 | [RTN_THROW] = { | |
1da177e4 LT |
131 | .error = -EAGAIN, |
132 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
133 | }, |
134 | [RTN_NAT] = { | |
1da177e4 LT |
135 | .error = -EINVAL, |
136 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
137 | }, |
138 | [RTN_XRESOLVE] = { | |
1da177e4 LT |
139 | .error = -EINVAL, |
140 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 | 141 | }, |
1da177e4 LT |
142 | }; |
143 | ||
c5038a83 DM |
144 | static void rt_fibinfo_free(struct rtable __rcu **rtp) |
145 | { | |
146 | struct rtable *rt = rcu_dereference_protected(*rtp, 1); | |
147 | ||
148 | if (!rt) | |
149 | return; | |
150 | ||
151 | /* Not even needed : RCU_INIT_POINTER(*rtp, NULL); | |
152 | * because we waited an RCU grace period before calling | |
153 | * free_fib_info_rcu() | |
154 | */ | |
155 | ||
95c47f9c | 156 | dst_dev_put(&rt->dst); |
b838d5e1 | 157 | dst_release_immediate(&rt->dst); |
c5038a83 DM |
158 | } |
159 | ||
4895c771 DM |
160 | static void free_nh_exceptions(struct fib_nh *nh) |
161 | { | |
caa41527 | 162 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
163 | int i; |
164 | ||
caa41527 ED |
165 | hash = rcu_dereference_protected(nh->nh_exceptions, 1); |
166 | if (!hash) | |
167 | return; | |
4895c771 DM |
168 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
169 | struct fib_nh_exception *fnhe; | |
170 | ||
5abf7f7e | 171 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
4895c771 DM |
172 | while (fnhe) { |
173 | struct fib_nh_exception *next; | |
82695b30 | 174 | |
5abf7f7e | 175 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
c5038a83 | 176 | |
2ffae99d TT |
177 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
178 | rt_fibinfo_free(&fnhe->fnhe_rth_output); | |
c5038a83 | 179 | |
4895c771 DM |
180 | kfree(fnhe); |
181 | ||
182 | fnhe = next; | |
183 | } | |
184 | } | |
185 | kfree(hash); | |
186 | } | |
187 | ||
c5038a83 | 188 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
d26b3a7c ED |
189 | { |
190 | int cpu; | |
191 | ||
192 | if (!rtp) | |
193 | return; | |
194 | ||
195 | for_each_possible_cpu(cpu) { | |
196 | struct rtable *rt; | |
197 | ||
198 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); | |
0830106c | 199 | if (rt) { |
95c47f9c | 200 | dst_dev_put(&rt->dst); |
b838d5e1 | 201 | dst_release_immediate(&rt->dst); |
0830106c | 202 | } |
d26b3a7c ED |
203 | } |
204 | free_percpu(rtp); | |
205 | } | |
206 | ||
1da177e4 | 207 | /* Release a nexthop info record */ |
19c1ea14 YZ |
208 | static void free_fib_info_rcu(struct rcu_head *head) |
209 | { | |
210 | struct fib_info *fi = container_of(head, struct fib_info, rcu); | |
211 | ||
e49cc0da YZ |
212 | change_nexthops(fi) { |
213 | if (nexthop_nh->nh_dev) | |
214 | dev_put(nexthop_nh->nh_dev); | |
5a6228a0 | 215 | lwtstate_put(nexthop_nh->nh_lwtstate); |
caa41527 | 216 | free_nh_exceptions(nexthop_nh); |
c5038a83 DM |
217 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
218 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); | |
e49cc0da YZ |
219 | } endfor_nexthops(fi); |
220 | ||
cc5f0eb2 DA |
221 | ip_fib_metrics_put(fi->fib_metrics); |
222 | ||
19c1ea14 YZ |
223 | kfree(fi); |
224 | } | |
1da177e4 LT |
225 | |
226 | void free_fib_info(struct fib_info *fi) | |
227 | { | |
228 | if (fi->fib_dead == 0) { | |
058bd4d2 | 229 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
230 | return; |
231 | } | |
1da177e4 | 232 | fib_info_cnt--; |
7a9bc9b8 DM |
233 | #ifdef CONFIG_IP_ROUTE_CLASSID |
234 | change_nexthops(fi) { | |
235 | if (nexthop_nh->nh_tclassid) | |
f4530fa5 | 236 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
7a9bc9b8 DM |
237 | } endfor_nexthops(fi); |
238 | #endif | |
19c1ea14 | 239 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 | 240 | } |
b423cb10 | 241 | EXPORT_SYMBOL_GPL(free_fib_info); |
1da177e4 LT |
242 | |
243 | void fib_release_info(struct fib_info *fi) | |
244 | { | |
832b4c5e | 245 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
246 | if (fi && --fi->fib_treeref == 0) { |
247 | hlist_del(&fi->fib_hash); | |
248 | if (fi->fib_prefsrc) | |
249 | hlist_del(&fi->fib_lhash); | |
250 | change_nexthops(fi) { | |
71fceff0 | 251 | if (!nexthop_nh->nh_dev) |
1da177e4 | 252 | continue; |
71fceff0 | 253 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
254 | } endfor_nexthops(fi) |
255 | fi->fib_dead = 1; | |
256 | fib_info_put(fi); | |
257 | } | |
832b4c5e | 258 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
259 | } |
260 | ||
6a31d2a9 | 261 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
262 | { |
263 | const struct fib_nh *onh = ofi->fib_nh; | |
264 | ||
265 | for_nexthops(fi) { | |
266 | if (nh->nh_oif != onh->nh_oif || | |
267 | nh->nh_gw != onh->nh_gw || | |
268 | nh->nh_scope != onh->nh_scope || | |
269 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
270 | nh->nh_weight != onh->nh_weight || | |
271 | #endif | |
c7066f70 | 272 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
273 | nh->nh_tclassid != onh->nh_tclassid || |
274 | #endif | |
571e7226 | 275 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
8a3d0316 | 276 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
1da177e4 LT |
277 | return -1; |
278 | onh++; | |
279 | } endfor_nexthops(fi); | |
280 | return 0; | |
281 | } | |
282 | ||
88ebc72f DM |
283 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
284 | { | |
285 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
286 | ||
287 | return (val ^ | |
288 | (val >> DEVINDEX_HASHBITS) ^ | |
289 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
290 | } | |
291 | ||
1da177e4 LT |
292 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
293 | { | |
123b9731 | 294 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
295 | unsigned int val = fi->fib_nhs; |
296 | ||
37e826c5 | 297 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 298 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 299 | val ^= fi->fib_priority; |
88ebc72f DM |
300 | for_nexthops(fi) { |
301 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
302 | } endfor_nexthops(fi) | |
1da177e4 LT |
303 | |
304 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
305 | } | |
306 | ||
307 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
308 | { | |
309 | struct hlist_head *head; | |
1da177e4 LT |
310 | struct fib_info *fi; |
311 | unsigned int hash; | |
312 | ||
313 | hash = fib_info_hashfn(nfi); | |
314 | head = &fib_info_hash[hash]; | |
315 | ||
b67bfe0d | 316 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 317 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 318 | continue; |
1da177e4 LT |
319 | if (fi->fib_nhs != nfi->fib_nhs) |
320 | continue; | |
321 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 322 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
323 | nfi->fib_prefsrc == fi->fib_prefsrc && |
324 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 325 | nfi->fib_type == fi->fib_type && |
1da177e4 | 326 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 327 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 328 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
1da177e4 LT |
329 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
330 | return fi; | |
331 | } | |
332 | ||
333 | return NULL; | |
334 | } | |
335 | ||
1da177e4 | 336 | /* Check, that the gateway is already configured. |
6a31d2a9 | 337 | * Used only by redirect accept routine. |
1da177e4 | 338 | */ |
d878e72e | 339 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
340 | { |
341 | struct hlist_head *head; | |
1da177e4 LT |
342 | struct fib_nh *nh; |
343 | unsigned int hash; | |
344 | ||
832b4c5e | 345 | spin_lock(&fib_info_lock); |
1da177e4 LT |
346 | |
347 | hash = fib_devindex_hashfn(dev->ifindex); | |
348 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 349 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
350 | if (nh->nh_dev == dev && |
351 | nh->nh_gw == gw && | |
6a31d2a9 | 352 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 353 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
354 | return 0; |
355 | } | |
356 | } | |
357 | ||
832b4c5e | 358 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
359 | |
360 | return -1; | |
361 | } | |
362 | ||
339bf98f TG |
363 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
364 | { | |
365 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
366 | + nla_total_size(4) /* RTA_TABLE */ | |
367 | + nla_total_size(4) /* RTA_DST */ | |
368 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
369 | + nla_total_size(4) /* RTA_PREFSRC */ |
370 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
371 | |
372 | /* space for nested metrics */ | |
373 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
374 | ||
375 | if (fi->fib_nhs) { | |
571e7226 | 376 | size_t nh_encapsize = 0; |
339bf98f TG |
377 | /* Also handles the special case fib_nhs == 1 */ |
378 | ||
379 | /* each nexthop is packed in an attribute */ | |
380 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
381 | ||
382 | /* may contain flow and gateway attribute */ | |
383 | nhsize += 2 * nla_total_size(4); | |
384 | ||
571e7226 RP |
385 | /* grab encap info */ |
386 | for_nexthops(fi) { | |
387 | if (nh->nh_lwtstate) { | |
388 | /* RTA_ENCAP_TYPE */ | |
389 | nh_encapsize += lwtunnel_get_encap_size( | |
390 | nh->nh_lwtstate); | |
391 | /* RTA_ENCAP */ | |
392 | nh_encapsize += nla_total_size(2); | |
393 | } | |
394 | } endfor_nexthops(fi); | |
395 | ||
339bf98f | 396 | /* all nexthops are packed in a nested attribute */ |
571e7226 RP |
397 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
398 | nh_encapsize); | |
399 | ||
339bf98f TG |
400 | } |
401 | ||
402 | return payload; | |
403 | } | |
404 | ||
81f7bf6c | 405 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 406 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 407 | unsigned int nlm_flags) |
1da177e4 LT |
408 | { |
409 | struct sk_buff *skb; | |
4e902c57 | 410 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 411 | int err = -ENOBUFS; |
1da177e4 | 412 | |
339bf98f | 413 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 414 | if (!skb) |
f21c7bc5 | 415 | goto errout; |
1da177e4 | 416 | |
15e47304 | 417 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 418 | fa->fa_type, key, dst_len, |
b8f55831 | 419 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
420 | if (err < 0) { |
421 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
422 | WARN_ON(err == -EMSGSIZE); | |
423 | kfree_skb(skb); | |
424 | goto errout; | |
425 | } | |
15e47304 | 426 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
427 | info->nlh, GFP_KERNEL); |
428 | return; | |
f21c7bc5 TG |
429 | errout: |
430 | if (err < 0) | |
4d1169c1 | 431 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
432 | } |
433 | ||
c9cb6b6e SH |
434 | static int fib_detect_death(struct fib_info *fi, int order, |
435 | struct fib_info **last_resort, int *last_idx, | |
436 | int dflt) | |
1da177e4 LT |
437 | { |
438 | struct neighbour *n; | |
439 | int state = NUD_NONE; | |
440 | ||
441 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
442 | if (n) { | |
443 | state = n->nud_state; | |
444 | neigh_release(n); | |
88f64320 JA |
445 | } else { |
446 | return 0; | |
1da177e4 | 447 | } |
d9319100 | 448 | if (state == NUD_REACHABLE) |
1da177e4 | 449 | return 0; |
6a31d2a9 | 450 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 451 | return 0; |
6a31d2a9 | 452 | if ((state & NUD_VALID) || |
88f64320 | 453 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
1da177e4 LT |
454 | *last_resort = fi; |
455 | *last_idx = order; | |
456 | } | |
457 | return 1; | |
458 | } | |
459 | ||
460 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
461 | ||
6d8422a1 DA |
462 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining, |
463 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
464 | { |
465 | int nhs = 0; | |
1da177e4 | 466 | |
4e902c57 | 467 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 468 | nhs++; |
4e902c57 TG |
469 | rtnh = rtnh_next(rtnh, &remaining); |
470 | } | |
471 | ||
472 | /* leftover implies invalid nexthop configuration, discard it */ | |
c3ab2b4e DA |
473 | if (remaining > 0) { |
474 | NL_SET_ERR_MSG(extack, | |
475 | "Invalid nexthop configuration - extra data after nexthops"); | |
476 | nhs = 0; | |
477 | } | |
478 | ||
479 | return nhs; | |
1da177e4 LT |
480 | } |
481 | ||
4e902c57 | 482 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
6d8422a1 DA |
483 | int remaining, struct fib_config *cfg, |
484 | struct netlink_ext_ack *extack) | |
1da177e4 | 485 | { |
571e7226 RP |
486 | int ret; |
487 | ||
1da177e4 | 488 | change_nexthops(fi) { |
4e902c57 TG |
489 | int attrlen; |
490 | ||
c3ab2b4e DA |
491 | if (!rtnh_ok(rtnh, remaining)) { |
492 | NL_SET_ERR_MSG(extack, | |
493 | "Invalid nexthop configuration - extra data after nexthop"); | |
1da177e4 | 494 | return -EINVAL; |
c3ab2b4e | 495 | } |
4e902c57 | 496 | |
c3ab2b4e DA |
497 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
498 | NL_SET_ERR_MSG(extack, | |
499 | "Invalid flags for nexthop - can not contain DEAD or LINKDOWN"); | |
80610229 | 500 | return -EINVAL; |
c3ab2b4e | 501 | } |
80610229 | 502 | |
71fceff0 DM |
503 | nexthop_nh->nh_flags = |
504 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
505 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
506 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
507 | |
508 | attrlen = rtnh_attrlen(rtnh); | |
509 | if (attrlen > 0) { | |
510 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
511 | ||
512 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 513 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
c7066f70 | 514 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 515 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 516 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 517 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 518 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 519 | #endif |
571e7226 RP |
520 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
521 | if (nla) { | |
522 | struct lwtunnel_state *lwtstate; | |
571e7226 RP |
523 | struct nlattr *nla_entype; |
524 | ||
525 | nla_entype = nla_find(attrs, attrlen, | |
526 | RTA_ENCAP_TYPE); | |
c3ab2b4e DA |
527 | if (!nla_entype) { |
528 | NL_SET_BAD_ATTR(extack, nla); | |
529 | NL_SET_ERR_MSG(extack, | |
530 | "Encap type is missing"); | |
571e7226 | 531 | goto err_inval; |
c3ab2b4e | 532 | } |
30357d7d DA |
533 | |
534 | ret = lwtunnel_build_state(nla_get_u16( | |
571e7226 | 535 | nla_entype), |
127eb7cd | 536 | nla, AF_INET, cfg, |
9ae28727 | 537 | &lwtstate, extack); |
571e7226 RP |
538 | if (ret) |
539 | goto errout; | |
5a6228a0 ND |
540 | nexthop_nh->nh_lwtstate = |
541 | lwtstate_get(lwtstate); | |
571e7226 | 542 | } |
1da177e4 | 543 | } |
4e902c57 TG |
544 | |
545 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 546 | } endfor_nexthops(fi); |
4e902c57 | 547 | |
1da177e4 | 548 | return 0; |
571e7226 RP |
549 | |
550 | err_inval: | |
551 | ret = -EINVAL; | |
552 | ||
553 | errout: | |
554 | return ret; | |
1da177e4 LT |
555 | } |
556 | ||
0e884c78 PN |
557 | static void fib_rebalance(struct fib_info *fi) |
558 | { | |
559 | int total; | |
560 | int w; | |
561 | struct in_device *in_dev; | |
562 | ||
563 | if (fi->fib_nhs < 2) | |
564 | return; | |
565 | ||
566 | total = 0; | |
567 | for_nexthops(fi) { | |
568 | if (nh->nh_flags & RTNH_F_DEAD) | |
569 | continue; | |
570 | ||
51161aa9 | 571 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0e884c78 PN |
572 | |
573 | if (in_dev && | |
574 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
575 | nh->nh_flags & RTNH_F_LINKDOWN) | |
576 | continue; | |
577 | ||
578 | total += nh->nh_weight; | |
579 | } endfor_nexthops(fi); | |
580 | ||
581 | w = 0; | |
582 | change_nexthops(fi) { | |
583 | int upper_bound; | |
584 | ||
51161aa9 | 585 | in_dev = __in_dev_get_rtnl(nexthop_nh->nh_dev); |
0e884c78 PN |
586 | |
587 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) { | |
588 | upper_bound = -1; | |
589 | } else if (in_dev && | |
590 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
591 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) { | |
592 | upper_bound = -1; | |
593 | } else { | |
594 | w += nexthop_nh->nh_weight; | |
0a837fe4 PN |
595 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
596 | total) - 1; | |
0e884c78 PN |
597 | } |
598 | ||
599 | atomic_set(&nexthop_nh->nh_upper_bound, upper_bound); | |
600 | } endfor_nexthops(fi); | |
0e884c78 | 601 | } |
0e884c78 PN |
602 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
603 | ||
604 | #define fib_rebalance(fi) do { } while (0) | |
0e884c78 PN |
605 | |
606 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
1da177e4 | 607 | |
30357d7d | 608 | static int fib_encap_match(u16 encap_type, |
e01286ef | 609 | struct nlattr *encap, |
30357d7d | 610 | const struct fib_nh *nh, |
9ae28727 DA |
611 | const struct fib_config *cfg, |
612 | struct netlink_ext_ack *extack) | |
571e7226 RP |
613 | { |
614 | struct lwtunnel_state *lwtstate; | |
df383e62 | 615 | int ret, result = 0; |
571e7226 RP |
616 | |
617 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
618 | return 0; | |
619 | ||
9ae28727 DA |
620 | ret = lwtunnel_build_state(encap_type, encap, AF_INET, |
621 | cfg, &lwtstate, extack); | |
df383e62 JB |
622 | if (!ret) { |
623 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); | |
624 | lwtstate_free(lwtstate); | |
625 | } | |
571e7226 | 626 | |
df383e62 | 627 | return result; |
571e7226 RP |
628 | } |
629 | ||
9ae28727 DA |
630 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi, |
631 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
632 | { |
633 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
634 | struct rtnexthop *rtnh; |
635 | int remaining; | |
1da177e4 LT |
636 | #endif |
637 | ||
4e902c57 | 638 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
639 | return 1; |
640 | ||
4e902c57 | 641 | if (cfg->fc_oif || cfg->fc_gw) { |
571e7226 | 642 | if (cfg->fc_encap) { |
9ae28727 DA |
643 | if (fib_encap_match(cfg->fc_encap_type, cfg->fc_encap, |
644 | fi->fib_nh, cfg, extack)) | |
645 | return 1; | |
571e7226 | 646 | } |
a8c6db1d SB |
647 | #ifdef CONFIG_IP_ROUTE_CLASSID |
648 | if (cfg->fc_flow && | |
649 | cfg->fc_flow != fi->fib_nh->nh_tclassid) | |
650 | return 1; | |
651 | #endif | |
4e902c57 TG |
652 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
653 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
654 | return 0; |
655 | return 1; | |
656 | } | |
657 | ||
658 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 659 | if (!cfg->fc_mp) |
1da177e4 | 660 | return 0; |
4e902c57 TG |
661 | |
662 | rtnh = cfg->fc_mp; | |
663 | remaining = cfg->fc_mp_len; | |
e905a9ed | 664 | |
1da177e4 | 665 | for_nexthops(fi) { |
4e902c57 | 666 | int attrlen; |
1da177e4 | 667 | |
4e902c57 | 668 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 669 | return -EINVAL; |
4e902c57 TG |
670 | |
671 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 672 | return 1; |
4e902c57 TG |
673 | |
674 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 675 | if (attrlen > 0) { |
4e902c57 TG |
676 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
677 | ||
678 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 679 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
1da177e4 | 680 | return 1; |
c7066f70 | 681 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
682 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
683 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
684 | return 1; |
685 | #endif | |
686 | } | |
4e902c57 TG |
687 | |
688 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
689 | } endfor_nexthops(fi); |
690 | #endif | |
691 | return 0; | |
692 | } | |
693 | ||
5f9ae3d9 XL |
694 | bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi) |
695 | { | |
696 | struct nlattr *nla; | |
697 | int remaining; | |
698 | ||
699 | if (!cfg->fc_mx) | |
700 | return true; | |
701 | ||
702 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
703 | int type = nla_type(nla); | |
d03a4557 | 704 | u32 fi_val, val; |
5f9ae3d9 XL |
705 | |
706 | if (!type) | |
707 | continue; | |
708 | if (type > RTAX_MAX) | |
709 | return false; | |
710 | ||
711 | if (type == RTAX_CC_ALGO) { | |
712 | char tmp[TCP_CA_NAME_MAX]; | |
713 | bool ecn_ca = false; | |
714 | ||
715 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
6670e152 | 716 | val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca); |
5f9ae3d9 | 717 | } else { |
5b5e7a0d ED |
718 | if (nla_len(nla) != sizeof(u32)) |
719 | return false; | |
5f9ae3d9 XL |
720 | val = nla_get_u32(nla); |
721 | } | |
722 | ||
d03a4557 PS |
723 | fi_val = fi->fib_metrics->metrics[type - 1]; |
724 | if (type == RTAX_FEATURES) | |
725 | fi_val &= ~DST_FEATURE_ECN_CA; | |
726 | ||
727 | if (fi_val != val) | |
5f9ae3d9 XL |
728 | return false; |
729 | } | |
730 | ||
731 | return true; | |
732 | } | |
733 | ||
1da177e4 LT |
734 | |
735 | /* | |
6a31d2a9 ED |
736 | * Picture |
737 | * ------- | |
738 | * | |
739 | * Semantics of nexthop is very messy by historical reasons. | |
740 | * We have to take into account, that: | |
741 | * a) gateway can be actually local interface address, | |
742 | * so that gatewayed route is direct. | |
743 | * b) gateway must be on-link address, possibly | |
744 | * described not by an ifaddr, but also by a direct route. | |
745 | * c) If both gateway and interface are specified, they should not | |
746 | * contradict. | |
747 | * d) If we use tunnel routes, gateway could be not on-link. | |
748 | * | |
749 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
750 | * results in pretty ugly and hairy code with obscure logic. | |
751 | * | |
752 | * I chose to generalized it instead, so that the size | |
753 | * of code does not increase practically, but it becomes | |
754 | * much more general. | |
755 | * Every prefix is assigned a "scope" value: "host" is local address, | |
756 | * "link" is direct route, | |
757 | * [ ... "site" ... "interior" ... ] | |
758 | * and "universe" is true gateway route with global meaning. | |
759 | * | |
760 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
761 | * where gw must have narrower scope. This recursion stops | |
762 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
763 | * which means that gw is forced to be on link. | |
764 | * | |
765 | * Code is still hairy, but now it is apparently logically | |
766 | * consistent and very flexible. F.e. as by-product it allows | |
767 | * to co-exists in peace independent exterior and interior | |
768 | * routing processes. | |
769 | * | |
770 | * Normally it looks as following. | |
771 | * | |
772 | * {universe prefix} -> (gw, oif) [scope link] | |
773 | * | | |
774 | * |-> {link prefix} -> (gw, oif) [scope local] | |
775 | * | | |
776 | * |-> {local prefix} (terminal node) | |
1da177e4 | 777 | */ |
fa8fefaa DA |
778 | static int fib_check_nh(struct fib_config *cfg, struct fib_nh *nh, |
779 | struct netlink_ext_ack *extack) | |
1da177e4 | 780 | { |
127eb7cd | 781 | int err = 0; |
86167a37 | 782 | struct net *net; |
6a31d2a9 | 783 | struct net_device *dev; |
1da177e4 | 784 | |
86167a37 | 785 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
786 | if (nh->nh_gw) { |
787 | struct fib_result res; | |
788 | ||
6a31d2a9 | 789 | if (nh->nh_flags & RTNH_F_ONLINK) { |
30bbaa19 | 790 | unsigned int addr_type; |
1da177e4 | 791 | |
c3ab2b4e DA |
792 | if (cfg->fc_scope >= RT_SCOPE_LINK) { |
793 | NL_SET_ERR_MSG(extack, | |
794 | "Nexthop has invalid scope"); | |
1da177e4 | 795 | return -EINVAL; |
c3ab2b4e | 796 | } |
6a31d2a9 | 797 | dev = __dev_get_by_index(net, nh->nh_oif); |
066b1030 DA |
798 | if (!dev) { |
799 | NL_SET_ERR_MSG(extack, "Nexthop device required for onlink"); | |
1da177e4 | 800 | return -ENODEV; |
066b1030 | 801 | } |
c3ab2b4e DA |
802 | if (!(dev->flags & IFF_UP)) { |
803 | NL_SET_ERR_MSG(extack, | |
804 | "Nexthop device is not up"); | |
1da177e4 | 805 | return -ENETDOWN; |
c3ab2b4e | 806 | } |
30bbaa19 | 807 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
c3ab2b4e DA |
808 | if (addr_type != RTN_UNICAST) { |
809 | NL_SET_ERR_MSG(extack, | |
810 | "Nexthop has invalid gateway"); | |
30bbaa19 | 811 | return -EINVAL; |
c3ab2b4e | 812 | } |
8a3d0316 AG |
813 | if (!netif_carrier_ok(dev)) |
814 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
815 | nh->nh_dev = dev; |
816 | dev_hold(dev); | |
817 | nh->nh_scope = RT_SCOPE_LINK; | |
818 | return 0; | |
819 | } | |
ebc0ffae | 820 | rcu_read_lock(); |
1da177e4 | 821 | { |
3bfd8472 | 822 | struct fib_table *tbl = NULL; |
9ade2286 DM |
823 | struct flowi4 fl4 = { |
824 | .daddr = nh->nh_gw, | |
825 | .flowi4_scope = cfg->fc_scope + 1, | |
826 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 827 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 828 | }; |
1da177e4 LT |
829 | |
830 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
831 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
832 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
3bfd8472 DA |
833 | |
834 | if (cfg->fc_table) | |
835 | tbl = fib_get_table(net, cfg->fc_table); | |
836 | ||
837 | if (tbl) | |
838 | err = fib_table_lookup(tbl, &fl4, &res, | |
1e313678 ED |
839 | FIB_LOOKUP_IGNORE_LINKSTATE | |
840 | FIB_LOOKUP_NOREF); | |
4c9bcd11 DA |
841 | |
842 | /* on error or if no table given do full lookup. This | |
843 | * is needed for example when nexthops are in the local | |
844 | * table rather than the given table | |
845 | */ | |
846 | if (!tbl || err) { | |
3bfd8472 DA |
847 | err = fib_lookup(net, &fl4, &res, |
848 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
4c9bcd11 DA |
849 | } |
850 | ||
ebc0ffae | 851 | if (err) { |
c3ab2b4e DA |
852 | NL_SET_ERR_MSG(extack, |
853 | "Nexthop has invalid gateway"); | |
ebc0ffae | 854 | rcu_read_unlock(); |
1da177e4 | 855 | return err; |
ebc0ffae | 856 | } |
1da177e4 LT |
857 | } |
858 | err = -EINVAL; | |
c3ab2b4e DA |
859 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) { |
860 | NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway"); | |
1da177e4 | 861 | goto out; |
c3ab2b4e | 862 | } |
1da177e4 LT |
863 | nh->nh_scope = res.scope; |
864 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 | 865 | nh->nh_dev = dev = FIB_RES_DEV(res); |
c3ab2b4e DA |
866 | if (!dev) { |
867 | NL_SET_ERR_MSG(extack, | |
868 | "No egress device for nexthop gateway"); | |
1da177e4 | 869 | goto out; |
c3ab2b4e | 870 | } |
6a31d2a9 | 871 | dev_hold(dev); |
8a3d0316 AG |
872 | if (!netif_carrier_ok(dev)) |
873 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 874 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
875 | } else { |
876 | struct in_device *in_dev; | |
877 | ||
c3ab2b4e DA |
878 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) { |
879 | NL_SET_ERR_MSG(extack, | |
880 | "Invalid flags for nexthop - PERVASIVE and ONLINK can not be set"); | |
1da177e4 | 881 | return -EINVAL; |
c3ab2b4e | 882 | } |
8723e1b4 ED |
883 | rcu_read_lock(); |
884 | err = -ENODEV; | |
86167a37 | 885 | in_dev = inetdev_by_index(net, nh->nh_oif); |
51456b29 | 886 | if (!in_dev) |
8723e1b4 ED |
887 | goto out; |
888 | err = -ENETDOWN; | |
c3ab2b4e DA |
889 | if (!(in_dev->dev->flags & IFF_UP)) { |
890 | NL_SET_ERR_MSG(extack, "Device for nexthop is not up"); | |
8723e1b4 | 891 | goto out; |
c3ab2b4e | 892 | } |
1da177e4 LT |
893 | nh->nh_dev = in_dev->dev; |
894 | dev_hold(nh->nh_dev); | |
895 | nh->nh_scope = RT_SCOPE_HOST; | |
8a3d0316 AG |
896 | if (!netif_carrier_ok(nh->nh_dev)) |
897 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 898 | err = 0; |
1da177e4 | 899 | } |
8723e1b4 ED |
900 | out: |
901 | rcu_read_unlock(); | |
902 | return err; | |
1da177e4 LT |
903 | } |
904 | ||
81f7bf6c | 905 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 906 | { |
123b9731 | 907 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 908 | |
6a31d2a9 ED |
909 | return ((__force u32)val ^ |
910 | ((__force u32)val >> 7) ^ | |
911 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
912 | } |
913 | ||
123b9731 | 914 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
915 | { |
916 | if (bytes <= PAGE_SIZE) | |
88f83491 | 917 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
918 | else |
919 | return (struct hlist_head *) | |
6a31d2a9 ED |
920 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
921 | get_order(bytes)); | |
1da177e4 LT |
922 | } |
923 | ||
123b9731 | 924 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
925 | { |
926 | if (!hash) | |
927 | return; | |
928 | ||
929 | if (bytes <= PAGE_SIZE) | |
930 | kfree(hash); | |
931 | else | |
932 | free_pages((unsigned long) hash, get_order(bytes)); | |
933 | } | |
934 | ||
123b9731 DM |
935 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
936 | struct hlist_head *new_laddrhash, | |
937 | unsigned int new_size) | |
1da177e4 | 938 | { |
b7656e7f | 939 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 940 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 941 | unsigned int i, bytes; |
1da177e4 | 942 | |
832b4c5e | 943 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
944 | old_info_hash = fib_info_hash; |
945 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 946 | fib_info_hash_size = new_size; |
1da177e4 LT |
947 | |
948 | for (i = 0; i < old_size; i++) { | |
949 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 950 | struct hlist_node *n; |
1da177e4 LT |
951 | struct fib_info *fi; |
952 | ||
b67bfe0d | 953 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
954 | struct hlist_head *dest; |
955 | unsigned int new_hash; | |
956 | ||
1da177e4 LT |
957 | new_hash = fib_info_hashfn(fi); |
958 | dest = &new_info_hash[new_hash]; | |
959 | hlist_add_head(&fi->fib_hash, dest); | |
960 | } | |
961 | } | |
962 | fib_info_hash = new_info_hash; | |
963 | ||
964 | for (i = 0; i < old_size; i++) { | |
965 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 966 | struct hlist_node *n; |
1da177e4 LT |
967 | struct fib_info *fi; |
968 | ||
b67bfe0d | 969 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
970 | struct hlist_head *ldest; |
971 | unsigned int new_hash; | |
972 | ||
1da177e4 LT |
973 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
974 | ldest = &new_laddrhash[new_hash]; | |
975 | hlist_add_head(&fi->fib_lhash, ldest); | |
976 | } | |
977 | } | |
978 | fib_info_laddrhash = new_laddrhash; | |
979 | ||
832b4c5e | 980 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
981 | |
982 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
983 | fib_info_hash_free(old_info_hash, bytes); |
984 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
985 | } |
986 | ||
436c3b66 DM |
987 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
988 | { | |
989 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
990 | nh->nh_gw, | |
37e826c5 | 991 | nh->nh_parent->fib_scope); |
436c3b66 DM |
992 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
993 | ||
994 | return nh->nh_saddr; | |
995 | } | |
996 | ||
021dd3b8 DA |
997 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
998 | { | |
999 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
1000 | fib_prefsrc != cfg->fc_dst) { | |
9b8ff518 | 1001 | u32 tb_id = cfg->fc_table; |
e1b8d903 | 1002 | int rc; |
021dd3b8 DA |
1003 | |
1004 | if (tb_id == RT_TABLE_MAIN) | |
1005 | tb_id = RT_TABLE_LOCAL; | |
1006 | ||
e1b8d903 DA |
1007 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
1008 | fib_prefsrc, tb_id); | |
1009 | ||
1010 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { | |
1011 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
1012 | fib_prefsrc, RT_TABLE_LOCAL); | |
021dd3b8 | 1013 | } |
e1b8d903 DA |
1014 | |
1015 | if (rc != RTN_LOCAL) | |
1016 | return false; | |
021dd3b8 DA |
1017 | } |
1018 | return true; | |
1019 | } | |
1020 | ||
6d8422a1 DA |
1021 | struct fib_info *fib_create_info(struct fib_config *cfg, |
1022 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1023 | { |
1024 | int err; | |
1025 | struct fib_info *fi = NULL; | |
1026 | struct fib_info *ofi; | |
1da177e4 | 1027 | int nhs = 1; |
7462bd74 | 1028 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 1029 | |
4c8237cd DM |
1030 | if (cfg->fc_type > RTN_MAX) |
1031 | goto err_inval; | |
1032 | ||
1da177e4 | 1033 | /* Fast check to catch the most weird cases */ |
c3ab2b4e DA |
1034 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) { |
1035 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1036 | goto err_inval; |
c3ab2b4e | 1037 | } |
1da177e4 | 1038 | |
c3ab2b4e DA |
1039 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
1040 | NL_SET_ERR_MSG(extack, | |
1041 | "Invalid rtm_flags - can not contain DEAD or LINKDOWN"); | |
80610229 | 1042 | goto err_inval; |
c3ab2b4e | 1043 | } |
80610229 | 1044 | |
1da177e4 | 1045 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 | 1046 | if (cfg->fc_mp) { |
6d8422a1 | 1047 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len, extack); |
1da177e4 LT |
1048 | if (nhs == 0) |
1049 | goto err_inval; | |
1050 | } | |
1051 | #endif | |
1da177e4 LT |
1052 | |
1053 | err = -ENOBUFS; | |
123b9731 DM |
1054 | if (fib_info_cnt >= fib_info_hash_size) { |
1055 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
1056 | struct hlist_head *new_info_hash; |
1057 | struct hlist_head *new_laddrhash; | |
1058 | unsigned int bytes; | |
1059 | ||
1060 | if (!new_size) | |
d94ce9b2 | 1061 | new_size = 16; |
1da177e4 | 1062 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
1063 | new_info_hash = fib_info_hash_alloc(bytes); |
1064 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 1065 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
1066 | fib_info_hash_free(new_info_hash, bytes); |
1067 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 1068 | } else |
123b9731 | 1069 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 1070 | |
123b9731 | 1071 | if (!fib_info_hash_size) |
1da177e4 LT |
1072 | goto failure; |
1073 | } | |
1074 | ||
0da974f4 | 1075 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
51456b29 | 1076 | if (!fi) |
1da177e4 | 1077 | goto failure; |
767a2217 | 1078 | fi->fib_metrics = ip_fib_metrics_init(fi->fib_net, cfg->fc_mx, |
d7e774f3 | 1079 | cfg->fc_mx_len, extack); |
767a2217 DA |
1080 | if (unlikely(IS_ERR(fi->fib_metrics))) { |
1081 | err = PTR_ERR(fi->fib_metrics); | |
1082 | kfree(fi); | |
1083 | return ERR_PTR(err); | |
187e5b3a | 1084 | } |
767a2217 | 1085 | |
187e5b3a | 1086 | fib_info_cnt++; |
efd7ef1c | 1087 | fi->fib_net = net; |
4e902c57 | 1088 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 1089 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
1090 | fi->fib_flags = cfg->fc_flags; |
1091 | fi->fib_priority = cfg->fc_priority; | |
1092 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 1093 | fi->fib_type = cfg->fc_type; |
5a56a0b3 | 1094 | fi->fib_tb_id = cfg->fc_table; |
1da177e4 LT |
1095 | |
1096 | fi->fib_nhs = nhs; | |
1097 | change_nexthops(fi) { | |
71fceff0 | 1098 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 1099 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
1100 | if (!nexthop_nh->nh_pcpu_rth_output) |
1101 | goto failure; | |
1da177e4 LT |
1102 | } endfor_nexthops(fi) |
1103 | ||
4e902c57 | 1104 | if (cfg->fc_mp) { |
1da177e4 | 1105 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6d8422a1 | 1106 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg, extack); |
4e902c57 | 1107 | if (err != 0) |
1da177e4 | 1108 | goto failure; |
c3ab2b4e DA |
1109 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) { |
1110 | NL_SET_ERR_MSG(extack, | |
1111 | "Nexthop device index does not match RTA_OIF"); | |
1da177e4 | 1112 | goto err_inval; |
c3ab2b4e DA |
1113 | } |
1114 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) { | |
1115 | NL_SET_ERR_MSG(extack, | |
1116 | "Nexthop gateway does not match RTA_GATEWAY"); | |
1da177e4 | 1117 | goto err_inval; |
c3ab2b4e | 1118 | } |
c7066f70 | 1119 | #ifdef CONFIG_IP_ROUTE_CLASSID |
c3ab2b4e DA |
1120 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) { |
1121 | NL_SET_ERR_MSG(extack, | |
1122 | "Nexthop class id does not match RTA_FLOW"); | |
1da177e4 | 1123 | goto err_inval; |
c3ab2b4e | 1124 | } |
1da177e4 LT |
1125 | #endif |
1126 | #else | |
c3ab2b4e DA |
1127 | NL_SET_ERR_MSG(extack, |
1128 | "Multipath support not enabled in kernel"); | |
1da177e4 LT |
1129 | goto err_inval; |
1130 | #endif | |
1131 | } else { | |
1132 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 | 1133 | |
571e7226 RP |
1134 | if (cfg->fc_encap) { |
1135 | struct lwtunnel_state *lwtstate; | |
571e7226 | 1136 | |
c3ab2b4e DA |
1137 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) { |
1138 | NL_SET_ERR_MSG(extack, | |
1139 | "LWT encap type not specified"); | |
571e7226 | 1140 | goto err_inval; |
c3ab2b4e | 1141 | } |
30357d7d | 1142 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd | 1143 | cfg->fc_encap, AF_INET, cfg, |
9ae28727 | 1144 | &lwtstate, extack); |
571e7226 RP |
1145 | if (err) |
1146 | goto failure; | |
1147 | ||
5a6228a0 | 1148 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
571e7226 | 1149 | } |
4e902c57 TG |
1150 | nh->nh_oif = cfg->fc_oif; |
1151 | nh->nh_gw = cfg->fc_gw; | |
1152 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 1153 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1154 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 1155 | if (nh->nh_tclassid) |
f4530fa5 | 1156 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 1157 | #endif |
1da177e4 LT |
1158 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1159 | nh->nh_weight = 1; | |
1160 | #endif | |
1161 | } | |
1162 | ||
4e902c57 | 1163 | if (fib_props[cfg->fc_type].error) { |
c3ab2b4e DA |
1164 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) { |
1165 | NL_SET_ERR_MSG(extack, | |
1166 | "Gateway, device and multipath can not be specified for this route type"); | |
1da177e4 | 1167 | goto err_inval; |
c3ab2b4e | 1168 | } |
1da177e4 | 1169 | goto link_it; |
4c8237cd DM |
1170 | } else { |
1171 | switch (cfg->fc_type) { | |
1172 | case RTN_UNICAST: | |
1173 | case RTN_LOCAL: | |
1174 | case RTN_BROADCAST: | |
1175 | case RTN_ANYCAST: | |
1176 | case RTN_MULTICAST: | |
1177 | break; | |
1178 | default: | |
c3ab2b4e | 1179 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
4c8237cd DM |
1180 | goto err_inval; |
1181 | } | |
1da177e4 LT |
1182 | } |
1183 | ||
c3ab2b4e DA |
1184 | if (cfg->fc_scope > RT_SCOPE_HOST) { |
1185 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1186 | goto err_inval; |
c3ab2b4e | 1187 | } |
1da177e4 | 1188 | |
4e902c57 | 1189 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
1190 | struct fib_nh *nh = fi->fib_nh; |
1191 | ||
1192 | /* Local address is added. */ | |
c3ab2b4e DA |
1193 | if (nhs != 1) { |
1194 | NL_SET_ERR_MSG(extack, | |
1195 | "Route with host scope can not have multiple nexthops"); | |
6d8422a1 | 1196 | goto err_inval; |
c3ab2b4e DA |
1197 | } |
1198 | if (nh->nh_gw) { | |
1199 | NL_SET_ERR_MSG(extack, | |
1200 | "Route with host scope can not have a gateway"); | |
1da177e4 | 1201 | goto err_inval; |
c3ab2b4e | 1202 | } |
1da177e4 | 1203 | nh->nh_scope = RT_SCOPE_NOWHERE; |
7462bd74 | 1204 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 | 1205 | err = -ENODEV; |
51456b29 | 1206 | if (!nh->nh_dev) |
1da177e4 LT |
1207 | goto failure; |
1208 | } else { | |
8a3d0316 AG |
1209 | int linkdown = 0; |
1210 | ||
1da177e4 | 1211 | change_nexthops(fi) { |
fa8fefaa | 1212 | err = fib_check_nh(cfg, nexthop_nh, extack); |
6a31d2a9 | 1213 | if (err != 0) |
1da177e4 | 1214 | goto failure; |
8a3d0316 AG |
1215 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
1216 | linkdown++; | |
1da177e4 | 1217 | } endfor_nexthops(fi) |
8a3d0316 AG |
1218 | if (linkdown == fi->fib_nhs) |
1219 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1220 | } |
1221 | ||
c3ab2b4e DA |
1222 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) { |
1223 | NL_SET_ERR_MSG(extack, "Invalid prefsrc address"); | |
021dd3b8 | 1224 | goto err_inval; |
c3ab2b4e | 1225 | } |
1da177e4 | 1226 | |
1fc050a1 | 1227 | change_nexthops(fi) { |
436c3b66 | 1228 | fib_info_update_nh_saddr(net, nexthop_nh); |
1fc050a1 DM |
1229 | } endfor_nexthops(fi) |
1230 | ||
0e884c78 PN |
1231 | fib_rebalance(fi); |
1232 | ||
1da177e4 | 1233 | link_it: |
6a31d2a9 ED |
1234 | ofi = fib_find_info(fi); |
1235 | if (ofi) { | |
1da177e4 LT |
1236 | fi->fib_dead = 1; |
1237 | free_fib_info(fi); | |
1238 | ofi->fib_treeref++; | |
1239 | return ofi; | |
1240 | } | |
1241 | ||
1242 | fi->fib_treeref++; | |
0029c0de | 1243 | refcount_set(&fi->fib_clntref, 1); |
832b4c5e | 1244 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1245 | hlist_add_head(&fi->fib_hash, |
1246 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1247 | if (fi->fib_prefsrc) { | |
1248 | struct hlist_head *head; | |
1249 | ||
1250 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1251 | hlist_add_head(&fi->fib_lhash, head); | |
1252 | } | |
1253 | change_nexthops(fi) { | |
1254 | struct hlist_head *head; | |
1255 | unsigned int hash; | |
1256 | ||
71fceff0 | 1257 | if (!nexthop_nh->nh_dev) |
1da177e4 | 1258 | continue; |
71fceff0 | 1259 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 1260 | head = &fib_info_devhash[hash]; |
71fceff0 | 1261 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 1262 | } endfor_nexthops(fi) |
832b4c5e | 1263 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1264 | return fi; |
1265 | ||
1266 | err_inval: | |
1267 | err = -EINVAL; | |
1268 | ||
1269 | failure: | |
e905a9ed | 1270 | if (fi) { |
1da177e4 LT |
1271 | fi->fib_dead = 1; |
1272 | free_fib_info(fi); | |
1273 | } | |
4e902c57 TG |
1274 | |
1275 | return ERR_PTR(err); | |
1da177e4 LT |
1276 | } |
1277 | ||
15e47304 | 1278 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1279 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1280 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1281 | { |
be403ea1 | 1282 | struct nlmsghdr *nlh; |
1da177e4 | 1283 | struct rtmsg *rtm; |
1da177e4 | 1284 | |
15e47304 | 1285 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1286 | if (!nlh) |
26932566 | 1287 | return -EMSGSIZE; |
be403ea1 TG |
1288 | |
1289 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1290 | rtm->rtm_family = AF_INET; |
1291 | rtm->rtm_dst_len = dst_len; | |
1292 | rtm->rtm_src_len = 0; | |
1293 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1294 | if (tb_id < 256) |
1295 | rtm->rtm_table = tb_id; | |
1296 | else | |
1297 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1298 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1299 | goto nla_put_failure; | |
1da177e4 LT |
1300 | rtm->rtm_type = type; |
1301 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1302 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1303 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1304 | |
f3756b79 | 1305 | if (rtm->rtm_dst_len && |
930345ea | 1306 | nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 DM |
1307 | goto nla_put_failure; |
1308 | if (fi->fib_priority && | |
1309 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1310 | goto nla_put_failure; | |
3fb07daf | 1311 | if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0) |
be403ea1 TG |
1312 | goto nla_put_failure; |
1313 | ||
f3756b79 | 1314 | if (fi->fib_prefsrc && |
930345ea | 1315 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1316 | goto nla_put_failure; |
1da177e4 | 1317 | if (fi->fib_nhs == 1) { |
f3756b79 | 1318 | if (fi->fib_nh->nh_gw && |
930345ea | 1319 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
f3756b79 DM |
1320 | goto nla_put_failure; |
1321 | if (fi->fib_nh->nh_oif && | |
1322 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1323 | goto nla_put_failure; | |
0eeb075f | 1324 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
25dd169a FW |
1325 | struct in_device *in_dev; |
1326 | ||
1327 | rcu_read_lock(); | |
1328 | in_dev = __in_dev_get_rcu(fi->fib_nh->nh_dev); | |
0eeb075f AG |
1329 | if (in_dev && |
1330 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1331 | rtm->rtm_flags |= RTNH_F_DEAD; | |
25dd169a | 1332 | rcu_read_unlock(); |
0eeb075f | 1333 | } |
475abbf1 IS |
1334 | if (fi->fib_nh->nh_flags & RTNH_F_OFFLOAD) |
1335 | rtm->rtm_flags |= RTNH_F_OFFLOAD; | |
c7066f70 | 1336 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1337 | if (fi->fib_nh[0].nh_tclassid && |
1338 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1339 | goto nla_put_failure; | |
8265abc0 | 1340 | #endif |
ea7a8085 DA |
1341 | if (fi->fib_nh->nh_lwtstate && |
1342 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate) < 0) | |
1343 | goto nla_put_failure; | |
1da177e4 LT |
1344 | } |
1345 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1346 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1347 | struct rtnexthop *rtnh; |
1348 | struct nlattr *mp; | |
1349 | ||
1350 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
51456b29 | 1351 | if (!mp) |
be403ea1 | 1352 | goto nla_put_failure; |
1da177e4 LT |
1353 | |
1354 | for_nexthops(fi) { | |
be403ea1 | 1355 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
51456b29 | 1356 | if (!rtnh) |
be403ea1 TG |
1357 | goto nla_put_failure; |
1358 | ||
1359 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
0eeb075f | 1360 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
25dd169a FW |
1361 | struct in_device *in_dev; |
1362 | ||
1363 | rcu_read_lock(); | |
1364 | in_dev = __in_dev_get_rcu(nh->nh_dev); | |
0eeb075f AG |
1365 | if (in_dev && |
1366 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1367 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
25dd169a | 1368 | rcu_read_unlock(); |
0eeb075f | 1369 | } |
be403ea1 TG |
1370 | rtnh->rtnh_hops = nh->nh_weight - 1; |
1371 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1372 | ||
f3756b79 | 1373 | if (nh->nh_gw && |
930345ea | 1374 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
f3756b79 | 1375 | goto nla_put_failure; |
c7066f70 | 1376 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1377 | if (nh->nh_tclassid && |
1378 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1379 | goto nla_put_failure; | |
8265abc0 | 1380 | #endif |
ea7a8085 DA |
1381 | if (nh->nh_lwtstate && |
1382 | lwtunnel_fill_encap(skb, nh->nh_lwtstate) < 0) | |
1383 | goto nla_put_failure; | |
1384 | ||
be403ea1 TG |
1385 | /* length of rtnetlink header + attributes */ |
1386 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1387 | } endfor_nexthops(fi); |
be403ea1 TG |
1388 | |
1389 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1390 | } |
1391 | #endif | |
053c095a JB |
1392 | nlmsg_end(skb, nlh); |
1393 | return 0; | |
1da177e4 | 1394 | |
be403ea1 | 1395 | nla_put_failure: |
26932566 PM |
1396 | nlmsg_cancel(skb, nlh); |
1397 | return -EMSGSIZE; | |
1da177e4 LT |
1398 | } |
1399 | ||
1da177e4 | 1400 | /* |
6a31d2a9 ED |
1401 | * Update FIB if: |
1402 | * - local address disappeared -> we must delete all the entries | |
1403 | * referring to it. | |
1404 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1405 | */ |
5a56a0b3 | 1406 | int fib_sync_down_addr(struct net_device *dev, __be32 local) |
1da177e4 LT |
1407 | { |
1408 | int ret = 0; | |
85326fa5 DL |
1409 | unsigned int hash = fib_laddr_hashfn(local); |
1410 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
5a56a0b3 MT |
1411 | struct net *net = dev_net(dev); |
1412 | int tb_id = l3mdev_fib_table(dev); | |
85326fa5 | 1413 | struct fib_info *fi; |
1da177e4 | 1414 | |
51456b29 | 1415 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1416 | return 0; |
1da177e4 | 1417 | |
b67bfe0d | 1418 | hlist_for_each_entry(fi, head, fib_lhash) { |
5a56a0b3 MT |
1419 | if (!net_eq(fi->fib_net, net) || |
1420 | fi->fib_tb_id != tb_id) | |
4814bdbd | 1421 | continue; |
85326fa5 DL |
1422 | if (fi->fib_prefsrc == local) { |
1423 | fi->fib_flags |= RTNH_F_DEAD; | |
1424 | ret++; | |
1da177e4 LT |
1425 | } |
1426 | } | |
85326fa5 DL |
1427 | return ret; |
1428 | } | |
1429 | ||
982acb97 IS |
1430 | static int call_fib_nh_notifiers(struct fib_nh *fib_nh, |
1431 | enum fib_event_type event_type) | |
1432 | { | |
1433 | struct in_device *in_dev = __in_dev_get_rtnl(fib_nh->nh_dev); | |
1434 | struct fib_nh_notifier_info info = { | |
1435 | .fib_nh = fib_nh, | |
1436 | }; | |
1437 | ||
1438 | switch (event_type) { | |
1439 | case FIB_EVENT_NH_ADD: | |
1440 | if (fib_nh->nh_flags & RTNH_F_DEAD) | |
1441 | break; | |
1442 | if (IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1443 | fib_nh->nh_flags & RTNH_F_LINKDOWN) | |
1444 | break; | |
04b1d4e5 IS |
1445 | return call_fib4_notifiers(dev_net(fib_nh->nh_dev), event_type, |
1446 | &info.info); | |
982acb97 | 1447 | case FIB_EVENT_NH_DEL: |
71ed7ee3 | 1448 | if ((in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && |
982acb97 IS |
1449 | fib_nh->nh_flags & RTNH_F_LINKDOWN) || |
1450 | (fib_nh->nh_flags & RTNH_F_DEAD)) | |
04b1d4e5 IS |
1451 | return call_fib4_notifiers(dev_net(fib_nh->nh_dev), |
1452 | event_type, &info.info); | |
982acb97 IS |
1453 | default: |
1454 | break; | |
1455 | } | |
1456 | ||
1457 | return NOTIFY_DONE; | |
1458 | } | |
1459 | ||
af7d6cce SD |
1460 | /* Update the PMTU of exceptions when: |
1461 | * - the new MTU of the first hop becomes smaller than the PMTU | |
1462 | * - the old MTU was the same as the PMTU, and it limited discovery of | |
1463 | * larger MTUs on the path. With that limit raised, we can now | |
1464 | * discover larger MTUs | |
1465 | * A special case is locked exceptions, for which the PMTU is smaller | |
1466 | * than the minimal accepted PMTU: | |
1467 | * - if the new MTU is greater than the PMTU, don't make any change | |
1468 | * - otherwise, unlock and set PMTU | |
1469 | */ | |
1470 | static void nh_update_mtu(struct fib_nh *nh, u32 new, u32 orig) | |
1471 | { | |
1472 | struct fnhe_hash_bucket *bucket; | |
1473 | int i; | |
1474 | ||
1475 | bucket = rcu_dereference_protected(nh->nh_exceptions, 1); | |
1476 | if (!bucket) | |
1477 | return; | |
1478 | ||
1479 | for (i = 0; i < FNHE_HASH_SIZE; i++) { | |
1480 | struct fib_nh_exception *fnhe; | |
1481 | ||
1482 | for (fnhe = rcu_dereference_protected(bucket[i].chain, 1); | |
1483 | fnhe; | |
1484 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, 1)) { | |
1485 | if (fnhe->fnhe_mtu_locked) { | |
1486 | if (new <= fnhe->fnhe_pmtu) { | |
1487 | fnhe->fnhe_pmtu = new; | |
1488 | fnhe->fnhe_mtu_locked = false; | |
1489 | } | |
1490 | } else if (new < fnhe->fnhe_pmtu || | |
1491 | orig == fnhe->fnhe_pmtu) { | |
1492 | fnhe->fnhe_pmtu = new; | |
1493 | } | |
1494 | } | |
1495 | } | |
1496 | } | |
1497 | ||
1498 | void fib_sync_mtu(struct net_device *dev, u32 orig_mtu) | |
1499 | { | |
1500 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1501 | struct hlist_head *head = &fib_info_devhash[hash]; | |
1502 | struct fib_nh *nh; | |
1503 | ||
1504 | hlist_for_each_entry(nh, head, nh_hash) { | |
1505 | if (nh->nh_dev == dev) | |
1506 | nh_update_mtu(nh, dev->mtu, orig_mtu); | |
1507 | } | |
1508 | } | |
1509 | ||
4f823def JA |
1510 | /* Event force Flags Description |
1511 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host | |
1512 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host | |
1513 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed | |
1514 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed | |
1515 | */ | |
1516 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) | |
85326fa5 DL |
1517 | { |
1518 | int ret = 0; | |
1519 | int scope = RT_SCOPE_NOWHERE; | |
1520 | struct fib_info *prev_fi = NULL; | |
1521 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1522 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1523 | struct fib_nh *nh; |
1da177e4 | 1524 | |
4f823def | 1525 | if (force) |
85326fa5 | 1526 | scope = -1; |
1da177e4 | 1527 | |
b67bfe0d | 1528 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1529 | struct fib_info *fi = nh->nh_parent; |
1530 | int dead; | |
1da177e4 | 1531 | |
85326fa5 DL |
1532 | BUG_ON(!fi->fib_nhs); |
1533 | if (nh->nh_dev != dev || fi == prev_fi) | |
1534 | continue; | |
1535 | prev_fi = fi; | |
1536 | dead = 0; | |
1537 | change_nexthops(fi) { | |
6a31d2a9 | 1538 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1539 | dead++; |
71fceff0 DM |
1540 | else if (nexthop_nh->nh_dev == dev && |
1541 | nexthop_nh->nh_scope != scope) { | |
8a3d0316 AG |
1542 | switch (event) { |
1543 | case NETDEV_DOWN: | |
1544 | case NETDEV_UNREGISTER: | |
1545 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1546 | /* fall through */ | |
1547 | case NETDEV_CHANGE: | |
1548 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; | |
1549 | break; | |
1550 | } | |
982acb97 IS |
1551 | call_fib_nh_notifiers(nexthop_nh, |
1552 | FIB_EVENT_NH_DEL); | |
85326fa5 DL |
1553 | dead++; |
1554 | } | |
1da177e4 | 1555 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 AG |
1556 | if (event == NETDEV_UNREGISTER && |
1557 | nexthop_nh->nh_dev == dev) { | |
85326fa5 DL |
1558 | dead = fi->fib_nhs; |
1559 | break; | |
1da177e4 | 1560 | } |
85326fa5 DL |
1561 | #endif |
1562 | } endfor_nexthops(fi) | |
1563 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1564 | switch (event) { |
1565 | case NETDEV_DOWN: | |
1566 | case NETDEV_UNREGISTER: | |
1567 | fi->fib_flags |= RTNH_F_DEAD; | |
1568 | /* fall through */ | |
1569 | case NETDEV_CHANGE: | |
1570 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1571 | break; | |
1572 | } | |
85326fa5 | 1573 | ret++; |
1da177e4 | 1574 | } |
0e884c78 PN |
1575 | |
1576 | fib_rebalance(fi); | |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | return ret; | |
1580 | } | |
1581 | ||
0c838ff1 | 1582 | /* Must be invoked inside of an RCU protected region. */ |
c7b371e3 | 1583 | static void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
1584 | { |
1585 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 1586 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 1587 | struct fib_table *tb = res->table; |
18a912e9 | 1588 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 1589 | int order = -1, last_idx = -1; |
2392debc JA |
1590 | struct fib_alias *fa, *fa1 = NULL; |
1591 | u32 last_prio = res->fi->fib_priority; | |
1592 | u8 last_tos = 0; | |
0c838ff1 | 1593 | |
56315f9e | 1594 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 DM |
1595 | struct fib_info *next_fi = fa->fa_info; |
1596 | ||
18a912e9 JA |
1597 | if (fa->fa_slen != slen) |
1598 | continue; | |
2392debc JA |
1599 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
1600 | continue; | |
18a912e9 JA |
1601 | if (fa->tb_id != tb->tb_id) |
1602 | continue; | |
2392debc JA |
1603 | if (next_fi->fib_priority > last_prio && |
1604 | fa->fa_tos == last_tos) { | |
1605 | if (last_tos) | |
1606 | continue; | |
1607 | break; | |
1608 | } | |
1609 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
1610 | continue; | |
1611 | last_tos = fa->fa_tos; | |
1612 | last_prio = next_fi->fib_priority; | |
1613 | ||
37e826c5 | 1614 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1615 | fa->fa_type != RTN_UNICAST) |
1616 | continue; | |
0c838ff1 DM |
1617 | if (!next_fi->fib_nh[0].nh_gw || |
1618 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1619 | continue; | |
1620 | ||
1621 | fib_alias_accessed(fa); | |
1622 | ||
51456b29 | 1623 | if (!fi) { |
0c838ff1 DM |
1624 | if (next_fi != res->fi) |
1625 | break; | |
2392debc | 1626 | fa1 = fa; |
0c838ff1 | 1627 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 1628 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 1629 | fib_result_assign(res, fi); |
2392debc | 1630 | fa1->fa_default = order; |
0c838ff1 DM |
1631 | goto out; |
1632 | } | |
1633 | fi = next_fi; | |
1634 | order++; | |
1635 | } | |
1636 | ||
51456b29 | 1637 | if (order <= 0 || !fi) { |
2392debc JA |
1638 | if (fa1) |
1639 | fa1->fa_default = -1; | |
0c838ff1 DM |
1640 | goto out; |
1641 | } | |
1642 | ||
1643 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 1644 | fa1->fa_default)) { |
0c838ff1 | 1645 | fib_result_assign(res, fi); |
2392debc | 1646 | fa1->fa_default = order; |
0c838ff1 DM |
1647 | goto out; |
1648 | } | |
1649 | ||
1650 | if (last_idx >= 0) | |
1651 | fib_result_assign(res, last_resort); | |
2392debc | 1652 | fa1->fa_default = last_idx; |
0c838ff1 | 1653 | out: |
31d40937 | 1654 | return; |
0c838ff1 DM |
1655 | } |
1656 | ||
1da177e4 | 1657 | /* |
6a31d2a9 ED |
1658 | * Dead device goes up. We wake up dead nexthops. |
1659 | * It takes sense only on multipath routes. | |
1da177e4 | 1660 | */ |
8a3d0316 | 1661 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
1da177e4 LT |
1662 | { |
1663 | struct fib_info *prev_fi; | |
1664 | unsigned int hash; | |
1665 | struct hlist_head *head; | |
1da177e4 LT |
1666 | struct fib_nh *nh; |
1667 | int ret; | |
1668 | ||
6a31d2a9 | 1669 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1670 | return 0; |
1671 | ||
c9b3292e JA |
1672 | if (nh_flags & RTNH_F_DEAD) { |
1673 | unsigned int flags = dev_get_flags(dev); | |
1674 | ||
1675 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1676 | nh_flags |= RTNH_F_LINKDOWN; | |
1677 | } | |
1678 | ||
1da177e4 LT |
1679 | prev_fi = NULL; |
1680 | hash = fib_devindex_hashfn(dev->ifindex); | |
1681 | head = &fib_info_devhash[hash]; | |
1682 | ret = 0; | |
1683 | ||
b67bfe0d | 1684 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1685 | struct fib_info *fi = nh->nh_parent; |
1686 | int alive; | |
1687 | ||
1688 | BUG_ON(!fi->fib_nhs); | |
1689 | if (nh->nh_dev != dev || fi == prev_fi) | |
1690 | continue; | |
1691 | ||
1692 | prev_fi = fi; | |
1693 | alive = 0; | |
1694 | change_nexthops(fi) { | |
8a3d0316 | 1695 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
1da177e4 LT |
1696 | alive++; |
1697 | continue; | |
1698 | } | |
51456b29 | 1699 | if (!nexthop_nh->nh_dev || |
6a31d2a9 | 1700 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1701 | continue; |
71fceff0 DM |
1702 | if (nexthop_nh->nh_dev != dev || |
1703 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1704 | continue; |
1705 | alive++; | |
8a3d0316 | 1706 | nexthop_nh->nh_flags &= ~nh_flags; |
982acb97 | 1707 | call_fib_nh_notifiers(nexthop_nh, FIB_EVENT_NH_ADD); |
1da177e4 LT |
1708 | } endfor_nexthops(fi) |
1709 | ||
1710 | if (alive > 0) { | |
8a3d0316 | 1711 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
1712 | ret++; |
1713 | } | |
0e884c78 PN |
1714 | |
1715 | fib_rebalance(fi); | |
1da177e4 LT |
1716 | } |
1717 | ||
1718 | return ret; | |
1719 | } | |
1720 | ||
8a3d0316 | 1721 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
a6db4494 DA |
1722 | static bool fib_good_nh(const struct fib_nh *nh) |
1723 | { | |
1724 | int state = NUD_REACHABLE; | |
1725 | ||
1726 | if (nh->nh_scope == RT_SCOPE_LINK) { | |
1727 | struct neighbour *n; | |
1728 | ||
1729 | rcu_read_lock_bh(); | |
1730 | ||
d985d151 ED |
1731 | n = __ipv4_neigh_lookup_noref(nh->nh_dev, |
1732 | (__force u32)nh->nh_gw); | |
a6db4494 DA |
1733 | if (n) |
1734 | state = n->nud_state; | |
1735 | ||
1736 | rcu_read_unlock_bh(); | |
1737 | } | |
1738 | ||
1739 | return !!(state & NUD_VALID); | |
1740 | } | |
8a3d0316 | 1741 | |
0e884c78 | 1742 | void fib_select_multipath(struct fib_result *res, int hash) |
1da177e4 LT |
1743 | { |
1744 | struct fib_info *fi = res->fi; | |
a6db4494 DA |
1745 | struct net *net = fi->fib_net; |
1746 | bool first = false; | |
1da177e4 | 1747 | |
0e884c78 | 1748 | for_nexthops(fi) { |
6174a30d XL |
1749 | if (net->ipv4.sysctl_fib_multipath_use_neigh) { |
1750 | if (!fib_good_nh(nh)) | |
1751 | continue; | |
1752 | if (!first) { | |
1753 | res->nh_sel = nhsel; | |
1754 | first = true; | |
1755 | } | |
1756 | } | |
1757 | ||
0e884c78 PN |
1758 | if (hash > atomic_read(&nh->nh_upper_bound)) |
1759 | continue; | |
1da177e4 | 1760 | |
6174a30d XL |
1761 | res->nh_sel = nhsel; |
1762 | return; | |
1da177e4 | 1763 | } endfor_nexthops(fi); |
1da177e4 LT |
1764 | } |
1765 | #endif | |
3ce58d84 DA |
1766 | |
1767 | void fib_select_path(struct net *net, struct fib_result *res, | |
bf4e0a3d | 1768 | struct flowi4 *fl4, const struct sk_buff *skb) |
3ce58d84 | 1769 | { |
0d876f2c DA |
1770 | if (fl4->flowi4_oif && !(fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF)) |
1771 | goto check_saddr; | |
7a18c5b9 | 1772 | |
3ce58d84 | 1773 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
0d876f2c | 1774 | if (res->fi->fib_nhs > 1) { |
7efc0b6b | 1775 | int h = fib_multipath_hash(net, fl4, skb, NULL); |
9920e48b | 1776 | |
bf4e0a3d | 1777 | fib_select_multipath(res, h); |
3ce58d84 DA |
1778 | } |
1779 | else | |
1780 | #endif | |
1781 | if (!res->prefixlen && | |
1782 | res->table->tb_num_default > 1 && | |
0d876f2c | 1783 | res->type == RTN_UNICAST) |
3ce58d84 DA |
1784 | fib_select_default(fl4, res); |
1785 | ||
0d876f2c | 1786 | check_saddr: |
3ce58d84 DA |
1787 | if (!fl4->saddr) |
1788 | fl4->saddr = FIB_RES_PREFSRC(net, *res); | |
1789 | } |