]>
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 | ||
1da177e4 | 16 | #include <asm/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> |
1da177e4 | 35 | |
14c85021 | 36 | #include <net/arp.h> |
1da177e4 LT |
37 | #include <net/ip.h> |
38 | #include <net/protocol.h> | |
39 | #include <net/route.h> | |
40 | #include <net/tcp.h> | |
41 | #include <net/sock.h> | |
42 | #include <net/ip_fib.h> | |
f21c7bc5 | 43 | #include <net/netlink.h> |
4e902c57 | 44 | #include <net/nexthop.h> |
571e7226 | 45 | #include <net/lwtunnel.h> |
1da177e4 LT |
46 | |
47 | #include "fib_lookup.h" | |
48 | ||
832b4c5e | 49 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
50 | static struct hlist_head *fib_info_hash; |
51 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 52 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
53 | static unsigned int fib_info_cnt; |
54 | ||
55 | #define DEVINDEX_HASHBITS 8 | |
56 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
57 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
58 | ||
59 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
60 | ||
61 | static DEFINE_SPINLOCK(fib_multipath_lock); | |
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 | ||
156 | dst_free(&rt->dst); | |
157 | } | |
158 | ||
4895c771 DM |
159 | static void free_nh_exceptions(struct fib_nh *nh) |
160 | { | |
caa41527 | 161 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
162 | int i; |
163 | ||
caa41527 ED |
164 | hash = rcu_dereference_protected(nh->nh_exceptions, 1); |
165 | if (!hash) | |
166 | return; | |
4895c771 DM |
167 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
168 | struct fib_nh_exception *fnhe; | |
169 | ||
5abf7f7e | 170 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
4895c771 DM |
171 | while (fnhe) { |
172 | struct fib_nh_exception *next; | |
173 | ||
5abf7f7e | 174 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
c5038a83 | 175 | |
2ffae99d TT |
176 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
177 | rt_fibinfo_free(&fnhe->fnhe_rth_output); | |
c5038a83 | 178 | |
4895c771 DM |
179 | kfree(fnhe); |
180 | ||
181 | fnhe = next; | |
182 | } | |
183 | } | |
184 | kfree(hash); | |
185 | } | |
186 | ||
c5038a83 | 187 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
d26b3a7c ED |
188 | { |
189 | int cpu; | |
190 | ||
191 | if (!rtp) | |
192 | return; | |
193 | ||
194 | for_each_possible_cpu(cpu) { | |
195 | struct rtable *rt; | |
196 | ||
197 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); | |
198 | if (rt) | |
199 | dst_free(&rt->dst); | |
200 | } | |
201 | free_percpu(rtp); | |
202 | } | |
203 | ||
1da177e4 | 204 | /* Release a nexthop info record */ |
19c1ea14 YZ |
205 | static void free_fib_info_rcu(struct rcu_head *head) |
206 | { | |
207 | struct fib_info *fi = container_of(head, struct fib_info, rcu); | |
208 | ||
e49cc0da YZ |
209 | change_nexthops(fi) { |
210 | if (nexthop_nh->nh_dev) | |
211 | dev_put(nexthop_nh->nh_dev); | |
5a6228a0 | 212 | lwtstate_put(nexthop_nh->nh_lwtstate); |
caa41527 | 213 | free_nh_exceptions(nexthop_nh); |
c5038a83 DM |
214 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
215 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); | |
e49cc0da YZ |
216 | } endfor_nexthops(fi); |
217 | ||
19c1ea14 YZ |
218 | if (fi->fib_metrics != (u32 *) dst_default_metrics) |
219 | kfree(fi->fib_metrics); | |
220 | kfree(fi); | |
221 | } | |
1da177e4 LT |
222 | |
223 | void free_fib_info(struct fib_info *fi) | |
224 | { | |
225 | if (fi->fib_dead == 0) { | |
058bd4d2 | 226 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
227 | return; |
228 | } | |
1da177e4 | 229 | fib_info_cnt--; |
7a9bc9b8 DM |
230 | #ifdef CONFIG_IP_ROUTE_CLASSID |
231 | change_nexthops(fi) { | |
232 | if (nexthop_nh->nh_tclassid) | |
f4530fa5 | 233 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
7a9bc9b8 DM |
234 | } endfor_nexthops(fi); |
235 | #endif | |
19c1ea14 | 236 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 LT |
237 | } |
238 | ||
239 | void fib_release_info(struct fib_info *fi) | |
240 | { | |
832b4c5e | 241 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
242 | if (fi && --fi->fib_treeref == 0) { |
243 | hlist_del(&fi->fib_hash); | |
244 | if (fi->fib_prefsrc) | |
245 | hlist_del(&fi->fib_lhash); | |
246 | change_nexthops(fi) { | |
71fceff0 | 247 | if (!nexthop_nh->nh_dev) |
1da177e4 | 248 | continue; |
71fceff0 | 249 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
250 | } endfor_nexthops(fi) |
251 | fi->fib_dead = 1; | |
252 | fib_info_put(fi); | |
253 | } | |
832b4c5e | 254 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
255 | } |
256 | ||
6a31d2a9 | 257 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
258 | { |
259 | const struct fib_nh *onh = ofi->fib_nh; | |
260 | ||
261 | for_nexthops(fi) { | |
262 | if (nh->nh_oif != onh->nh_oif || | |
263 | nh->nh_gw != onh->nh_gw || | |
264 | nh->nh_scope != onh->nh_scope || | |
265 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
266 | nh->nh_weight != onh->nh_weight || | |
267 | #endif | |
c7066f70 | 268 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
269 | nh->nh_tclassid != onh->nh_tclassid || |
270 | #endif | |
571e7226 | 271 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
8a3d0316 | 272 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
1da177e4 LT |
273 | return -1; |
274 | onh++; | |
275 | } endfor_nexthops(fi); | |
276 | return 0; | |
277 | } | |
278 | ||
88ebc72f DM |
279 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
280 | { | |
281 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
282 | ||
283 | return (val ^ | |
284 | (val >> DEVINDEX_HASHBITS) ^ | |
285 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
289 | { | |
123b9731 | 290 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
291 | unsigned int val = fi->fib_nhs; |
292 | ||
37e826c5 | 293 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 294 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 295 | val ^= fi->fib_priority; |
88ebc72f DM |
296 | for_nexthops(fi) { |
297 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
298 | } endfor_nexthops(fi) | |
1da177e4 LT |
299 | |
300 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
301 | } | |
302 | ||
303 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
304 | { | |
305 | struct hlist_head *head; | |
1da177e4 LT |
306 | struct fib_info *fi; |
307 | unsigned int hash; | |
308 | ||
309 | hash = fib_info_hashfn(nfi); | |
310 | head = &fib_info_hash[hash]; | |
311 | ||
b67bfe0d | 312 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 313 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 314 | continue; |
1da177e4 LT |
315 | if (fi->fib_nhs != nfi->fib_nhs) |
316 | continue; | |
317 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 318 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
319 | nfi->fib_prefsrc == fi->fib_prefsrc && |
320 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 321 | nfi->fib_type == fi->fib_type && |
1da177e4 | 322 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 323 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 324 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
1da177e4 LT |
325 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
326 | return fi; | |
327 | } | |
328 | ||
329 | return NULL; | |
330 | } | |
331 | ||
1da177e4 | 332 | /* Check, that the gateway is already configured. |
6a31d2a9 | 333 | * Used only by redirect accept routine. |
1da177e4 | 334 | */ |
d878e72e | 335 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
336 | { |
337 | struct hlist_head *head; | |
1da177e4 LT |
338 | struct fib_nh *nh; |
339 | unsigned int hash; | |
340 | ||
832b4c5e | 341 | spin_lock(&fib_info_lock); |
1da177e4 LT |
342 | |
343 | hash = fib_devindex_hashfn(dev->ifindex); | |
344 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 345 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
346 | if (nh->nh_dev == dev && |
347 | nh->nh_gw == gw && | |
6a31d2a9 | 348 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 349 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
350 | return 0; |
351 | } | |
352 | } | |
353 | ||
832b4c5e | 354 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
355 | |
356 | return -1; | |
357 | } | |
358 | ||
339bf98f TG |
359 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
360 | { | |
361 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
362 | + nla_total_size(4) /* RTA_TABLE */ | |
363 | + nla_total_size(4) /* RTA_DST */ | |
364 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
365 | + nla_total_size(4) /* RTA_PREFSRC */ |
366 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
367 | |
368 | /* space for nested metrics */ | |
369 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
370 | ||
371 | if (fi->fib_nhs) { | |
571e7226 | 372 | size_t nh_encapsize = 0; |
339bf98f TG |
373 | /* Also handles the special case fib_nhs == 1 */ |
374 | ||
375 | /* each nexthop is packed in an attribute */ | |
376 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
377 | ||
378 | /* may contain flow and gateway attribute */ | |
379 | nhsize += 2 * nla_total_size(4); | |
380 | ||
571e7226 RP |
381 | /* grab encap info */ |
382 | for_nexthops(fi) { | |
383 | if (nh->nh_lwtstate) { | |
384 | /* RTA_ENCAP_TYPE */ | |
385 | nh_encapsize += lwtunnel_get_encap_size( | |
386 | nh->nh_lwtstate); | |
387 | /* RTA_ENCAP */ | |
388 | nh_encapsize += nla_total_size(2); | |
389 | } | |
390 | } endfor_nexthops(fi); | |
391 | ||
339bf98f | 392 | /* all nexthops are packed in a nested attribute */ |
571e7226 RP |
393 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
394 | nh_encapsize); | |
395 | ||
339bf98f TG |
396 | } |
397 | ||
398 | return payload; | |
399 | } | |
400 | ||
81f7bf6c | 401 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 402 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 403 | unsigned int nlm_flags) |
1da177e4 LT |
404 | { |
405 | struct sk_buff *skb; | |
4e902c57 | 406 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 407 | int err = -ENOBUFS; |
1da177e4 | 408 | |
339bf98f | 409 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 410 | if (!skb) |
f21c7bc5 | 411 | goto errout; |
1da177e4 | 412 | |
15e47304 | 413 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 414 | fa->fa_type, key, dst_len, |
b8f55831 | 415 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
416 | if (err < 0) { |
417 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
418 | WARN_ON(err == -EMSGSIZE); | |
419 | kfree_skb(skb); | |
420 | goto errout; | |
421 | } | |
15e47304 | 422 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
423 | info->nlh, GFP_KERNEL); |
424 | return; | |
f21c7bc5 TG |
425 | errout: |
426 | if (err < 0) | |
4d1169c1 | 427 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
428 | } |
429 | ||
c9cb6b6e SH |
430 | static int fib_detect_death(struct fib_info *fi, int order, |
431 | struct fib_info **last_resort, int *last_idx, | |
432 | int dflt) | |
1da177e4 LT |
433 | { |
434 | struct neighbour *n; | |
435 | int state = NUD_NONE; | |
436 | ||
437 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
438 | if (n) { | |
439 | state = n->nud_state; | |
440 | neigh_release(n); | |
88f64320 JA |
441 | } else { |
442 | return 0; | |
1da177e4 | 443 | } |
d9319100 | 444 | if (state == NUD_REACHABLE) |
1da177e4 | 445 | return 0; |
6a31d2a9 | 446 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 447 | return 0; |
6a31d2a9 | 448 | if ((state & NUD_VALID) || |
88f64320 | 449 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
1da177e4 LT |
450 | *last_resort = fi; |
451 | *last_idx = order; | |
452 | } | |
453 | return 1; | |
454 | } | |
455 | ||
456 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
457 | ||
4e902c57 | 458 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining) |
1da177e4 LT |
459 | { |
460 | int nhs = 0; | |
1da177e4 | 461 | |
4e902c57 | 462 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 463 | nhs++; |
4e902c57 TG |
464 | rtnh = rtnh_next(rtnh, &remaining); |
465 | } | |
466 | ||
467 | /* leftover implies invalid nexthop configuration, discard it */ | |
468 | return remaining > 0 ? 0 : nhs; | |
1da177e4 LT |
469 | } |
470 | ||
4e902c57 TG |
471 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
472 | int remaining, struct fib_config *cfg) | |
1da177e4 | 473 | { |
571e7226 RP |
474 | struct net *net = cfg->fc_nlinfo.nl_net; |
475 | int ret; | |
476 | ||
1da177e4 | 477 | change_nexthops(fi) { |
4e902c57 TG |
478 | int attrlen; |
479 | ||
480 | if (!rtnh_ok(rtnh, remaining)) | |
1da177e4 | 481 | return -EINVAL; |
4e902c57 | 482 | |
71fceff0 DM |
483 | nexthop_nh->nh_flags = |
484 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
485 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
486 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
487 | |
488 | attrlen = rtnh_attrlen(rtnh); | |
489 | if (attrlen > 0) { | |
490 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
491 | ||
492 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 493 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
c7066f70 | 494 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 495 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 496 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 497 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 498 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 499 | #endif |
571e7226 RP |
500 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
501 | if (nla) { | |
502 | struct lwtunnel_state *lwtstate; | |
503 | struct net_device *dev = NULL; | |
504 | struct nlattr *nla_entype; | |
505 | ||
506 | nla_entype = nla_find(attrs, attrlen, | |
507 | RTA_ENCAP_TYPE); | |
508 | if (!nla_entype) | |
509 | goto err_inval; | |
510 | if (cfg->fc_oif) | |
511 | dev = __dev_get_by_index(net, cfg->fc_oif); | |
512 | ret = lwtunnel_build_state(dev, nla_get_u16( | |
513 | nla_entype), | |
127eb7cd TH |
514 | nla, AF_INET, cfg, |
515 | &lwtstate); | |
571e7226 RP |
516 | if (ret) |
517 | goto errout; | |
5a6228a0 ND |
518 | nexthop_nh->nh_lwtstate = |
519 | lwtstate_get(lwtstate); | |
571e7226 | 520 | } |
1da177e4 | 521 | } |
4e902c57 TG |
522 | |
523 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 524 | } endfor_nexthops(fi); |
4e902c57 | 525 | |
1da177e4 | 526 | return 0; |
571e7226 RP |
527 | |
528 | err_inval: | |
529 | ret = -EINVAL; | |
530 | ||
531 | errout: | |
532 | return ret; | |
1da177e4 LT |
533 | } |
534 | ||
535 | #endif | |
536 | ||
e01286ef YX |
537 | static int fib_encap_match(struct net *net, u16 encap_type, |
538 | struct nlattr *encap, | |
127eb7cd TH |
539 | int oif, const struct fib_nh *nh, |
540 | const struct fib_config *cfg) | |
571e7226 RP |
541 | { |
542 | struct lwtunnel_state *lwtstate; | |
543 | struct net_device *dev = NULL; | |
df383e62 | 544 | int ret, result = 0; |
571e7226 RP |
545 | |
546 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
547 | return 0; | |
548 | ||
549 | if (oif) | |
550 | dev = __dev_get_by_index(net, oif); | |
127eb7cd TH |
551 | ret = lwtunnel_build_state(dev, encap_type, encap, |
552 | AF_INET, cfg, &lwtstate); | |
df383e62 JB |
553 | if (!ret) { |
554 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); | |
555 | lwtstate_free(lwtstate); | |
556 | } | |
571e7226 | 557 | |
df383e62 | 558 | return result; |
571e7226 RP |
559 | } |
560 | ||
4e902c57 | 561 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
1da177e4 | 562 | { |
571e7226 | 563 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 564 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
565 | struct rtnexthop *rtnh; |
566 | int remaining; | |
1da177e4 LT |
567 | #endif |
568 | ||
4e902c57 | 569 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
570 | return 1; |
571 | ||
4e902c57 | 572 | if (cfg->fc_oif || cfg->fc_gw) { |
571e7226 RP |
573 | if (cfg->fc_encap) { |
574 | if (fib_encap_match(net, cfg->fc_encap_type, | |
575 | cfg->fc_encap, cfg->fc_oif, | |
127eb7cd | 576 | fi->fib_nh, cfg)) |
571e7226 RP |
577 | return 1; |
578 | } | |
4e902c57 TG |
579 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
580 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
581 | return 0; |
582 | return 1; | |
583 | } | |
584 | ||
585 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 586 | if (!cfg->fc_mp) |
1da177e4 | 587 | return 0; |
4e902c57 TG |
588 | |
589 | rtnh = cfg->fc_mp; | |
590 | remaining = cfg->fc_mp_len; | |
e905a9ed | 591 | |
1da177e4 | 592 | for_nexthops(fi) { |
4e902c57 | 593 | int attrlen; |
1da177e4 | 594 | |
4e902c57 | 595 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 596 | return -EINVAL; |
4e902c57 TG |
597 | |
598 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 599 | return 1; |
4e902c57 TG |
600 | |
601 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 602 | if (attrlen > 0) { |
4e902c57 TG |
603 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
604 | ||
605 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 606 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
1da177e4 | 607 | return 1; |
c7066f70 | 608 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
609 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
610 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
611 | return 1; |
612 | #endif | |
613 | } | |
4e902c57 TG |
614 | |
615 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
616 | } endfor_nexthops(fi); |
617 | #endif | |
618 | return 0; | |
619 | } | |
620 | ||
621 | ||
622 | /* | |
6a31d2a9 ED |
623 | * Picture |
624 | * ------- | |
625 | * | |
626 | * Semantics of nexthop is very messy by historical reasons. | |
627 | * We have to take into account, that: | |
628 | * a) gateway can be actually local interface address, | |
629 | * so that gatewayed route is direct. | |
630 | * b) gateway must be on-link address, possibly | |
631 | * described not by an ifaddr, but also by a direct route. | |
632 | * c) If both gateway and interface are specified, they should not | |
633 | * contradict. | |
634 | * d) If we use tunnel routes, gateway could be not on-link. | |
635 | * | |
636 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
637 | * results in pretty ugly and hairy code with obscure logic. | |
638 | * | |
639 | * I chose to generalized it instead, so that the size | |
640 | * of code does not increase practically, but it becomes | |
641 | * much more general. | |
642 | * Every prefix is assigned a "scope" value: "host" is local address, | |
643 | * "link" is direct route, | |
644 | * [ ... "site" ... "interior" ... ] | |
645 | * and "universe" is true gateway route with global meaning. | |
646 | * | |
647 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
648 | * where gw must have narrower scope. This recursion stops | |
649 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
650 | * which means that gw is forced to be on link. | |
651 | * | |
652 | * Code is still hairy, but now it is apparently logically | |
653 | * consistent and very flexible. F.e. as by-product it allows | |
654 | * to co-exists in peace independent exterior and interior | |
655 | * routing processes. | |
656 | * | |
657 | * Normally it looks as following. | |
658 | * | |
659 | * {universe prefix} -> (gw, oif) [scope link] | |
660 | * | | |
661 | * |-> {link prefix} -> (gw, oif) [scope local] | |
662 | * | | |
663 | * |-> {local prefix} (terminal node) | |
1da177e4 | 664 | */ |
4e902c57 TG |
665 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
666 | struct fib_nh *nh) | |
1da177e4 | 667 | { |
127eb7cd | 668 | int err = 0; |
86167a37 | 669 | struct net *net; |
6a31d2a9 | 670 | struct net_device *dev; |
1da177e4 | 671 | |
86167a37 | 672 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
673 | if (nh->nh_gw) { |
674 | struct fib_result res; | |
675 | ||
6a31d2a9 | 676 | if (nh->nh_flags & RTNH_F_ONLINK) { |
30bbaa19 | 677 | unsigned int addr_type; |
1da177e4 | 678 | |
4e902c57 | 679 | if (cfg->fc_scope >= RT_SCOPE_LINK) |
1da177e4 | 680 | return -EINVAL; |
6a31d2a9 ED |
681 | dev = __dev_get_by_index(net, nh->nh_oif); |
682 | if (!dev) | |
1da177e4 | 683 | return -ENODEV; |
6a31d2a9 | 684 | if (!(dev->flags & IFF_UP)) |
1da177e4 | 685 | return -ENETDOWN; |
30bbaa19 DA |
686 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
687 | if (addr_type != RTN_UNICAST) | |
688 | return -EINVAL; | |
8a3d0316 AG |
689 | if (!netif_carrier_ok(dev)) |
690 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
691 | nh->nh_dev = dev; |
692 | dev_hold(dev); | |
693 | nh->nh_scope = RT_SCOPE_LINK; | |
694 | return 0; | |
695 | } | |
ebc0ffae | 696 | rcu_read_lock(); |
1da177e4 | 697 | { |
3bfd8472 | 698 | struct fib_table *tbl = NULL; |
9ade2286 DM |
699 | struct flowi4 fl4 = { |
700 | .daddr = nh->nh_gw, | |
701 | .flowi4_scope = cfg->fc_scope + 1, | |
702 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 703 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 704 | }; |
1da177e4 LT |
705 | |
706 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
707 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
708 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
3bfd8472 DA |
709 | |
710 | if (cfg->fc_table) | |
711 | tbl = fib_get_table(net, cfg->fc_table); | |
712 | ||
713 | if (tbl) | |
714 | err = fib_table_lookup(tbl, &fl4, &res, | |
1e313678 ED |
715 | FIB_LOOKUP_IGNORE_LINKSTATE | |
716 | FIB_LOOKUP_NOREF); | |
4c9bcd11 DA |
717 | |
718 | /* on error or if no table given do full lookup. This | |
719 | * is needed for example when nexthops are in the local | |
720 | * table rather than the given table | |
721 | */ | |
722 | if (!tbl || err) { | |
3bfd8472 DA |
723 | err = fib_lookup(net, &fl4, &res, |
724 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
4c9bcd11 DA |
725 | } |
726 | ||
ebc0ffae ED |
727 | if (err) { |
728 | rcu_read_unlock(); | |
1da177e4 | 729 | return err; |
ebc0ffae | 730 | } |
1da177e4 LT |
731 | } |
732 | err = -EINVAL; | |
733 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
734 | goto out; | |
735 | nh->nh_scope = res.scope; | |
736 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 ED |
737 | nh->nh_dev = dev = FIB_RES_DEV(res); |
738 | if (!dev) | |
1da177e4 | 739 | goto out; |
6a31d2a9 | 740 | dev_hold(dev); |
8a3d0316 AG |
741 | if (!netif_carrier_ok(dev)) |
742 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 743 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
744 | } else { |
745 | struct in_device *in_dev; | |
746 | ||
6a31d2a9 | 747 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) |
1da177e4 LT |
748 | return -EINVAL; |
749 | ||
8723e1b4 ED |
750 | rcu_read_lock(); |
751 | err = -ENODEV; | |
86167a37 | 752 | in_dev = inetdev_by_index(net, nh->nh_oif); |
51456b29 | 753 | if (!in_dev) |
8723e1b4 ED |
754 | goto out; |
755 | err = -ENETDOWN; | |
756 | if (!(in_dev->dev->flags & IFF_UP)) | |
757 | goto out; | |
1da177e4 LT |
758 | nh->nh_dev = in_dev->dev; |
759 | dev_hold(nh->nh_dev); | |
760 | nh->nh_scope = RT_SCOPE_HOST; | |
8a3d0316 AG |
761 | if (!netif_carrier_ok(nh->nh_dev)) |
762 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 763 | err = 0; |
1da177e4 | 764 | } |
8723e1b4 ED |
765 | out: |
766 | rcu_read_unlock(); | |
767 | return err; | |
1da177e4 LT |
768 | } |
769 | ||
81f7bf6c | 770 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 771 | { |
123b9731 | 772 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 773 | |
6a31d2a9 ED |
774 | return ((__force u32)val ^ |
775 | ((__force u32)val >> 7) ^ | |
776 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
777 | } |
778 | ||
123b9731 | 779 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
780 | { |
781 | if (bytes <= PAGE_SIZE) | |
88f83491 | 782 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
783 | else |
784 | return (struct hlist_head *) | |
6a31d2a9 ED |
785 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
786 | get_order(bytes)); | |
1da177e4 LT |
787 | } |
788 | ||
123b9731 | 789 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
790 | { |
791 | if (!hash) | |
792 | return; | |
793 | ||
794 | if (bytes <= PAGE_SIZE) | |
795 | kfree(hash); | |
796 | else | |
797 | free_pages((unsigned long) hash, get_order(bytes)); | |
798 | } | |
799 | ||
123b9731 DM |
800 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
801 | struct hlist_head *new_laddrhash, | |
802 | unsigned int new_size) | |
1da177e4 | 803 | { |
b7656e7f | 804 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 805 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 806 | unsigned int i, bytes; |
1da177e4 | 807 | |
832b4c5e | 808 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
809 | old_info_hash = fib_info_hash; |
810 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 811 | fib_info_hash_size = new_size; |
1da177e4 LT |
812 | |
813 | for (i = 0; i < old_size; i++) { | |
814 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 815 | struct hlist_node *n; |
1da177e4 LT |
816 | struct fib_info *fi; |
817 | ||
b67bfe0d | 818 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
819 | struct hlist_head *dest; |
820 | unsigned int new_hash; | |
821 | ||
1da177e4 LT |
822 | new_hash = fib_info_hashfn(fi); |
823 | dest = &new_info_hash[new_hash]; | |
824 | hlist_add_head(&fi->fib_hash, dest); | |
825 | } | |
826 | } | |
827 | fib_info_hash = new_info_hash; | |
828 | ||
829 | for (i = 0; i < old_size; i++) { | |
830 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 831 | struct hlist_node *n; |
1da177e4 LT |
832 | struct fib_info *fi; |
833 | ||
b67bfe0d | 834 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
835 | struct hlist_head *ldest; |
836 | unsigned int new_hash; | |
837 | ||
1da177e4 LT |
838 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
839 | ldest = &new_laddrhash[new_hash]; | |
840 | hlist_add_head(&fi->fib_lhash, ldest); | |
841 | } | |
842 | } | |
843 | fib_info_laddrhash = new_laddrhash; | |
844 | ||
832b4c5e | 845 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
846 | |
847 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
848 | fib_info_hash_free(old_info_hash, bytes); |
849 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
850 | } |
851 | ||
436c3b66 DM |
852 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
853 | { | |
854 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
855 | nh->nh_gw, | |
37e826c5 | 856 | nh->nh_parent->fib_scope); |
436c3b66 DM |
857 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
858 | ||
859 | return nh->nh_saddr; | |
860 | } | |
861 | ||
021dd3b8 DA |
862 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
863 | { | |
864 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
865 | fib_prefsrc != cfg->fc_dst) { | |
866 | int tb_id = cfg->fc_table; | |
867 | ||
868 | if (tb_id == RT_TABLE_MAIN) | |
869 | tb_id = RT_TABLE_LOCAL; | |
870 | ||
871 | if (inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
872 | fib_prefsrc, tb_id) != RTN_LOCAL) { | |
873 | return false; | |
874 | } | |
875 | } | |
876 | return true; | |
877 | } | |
878 | ||
6cf9dfd3 FW |
879 | static int |
880 | fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) | |
881 | { | |
882 | struct nlattr *nla; | |
883 | int remaining; | |
884 | ||
885 | if (!cfg->fc_mx) | |
886 | return 0; | |
887 | ||
888 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
889 | int type = nla_type(nla); | |
890 | u32 val; | |
891 | ||
892 | if (!type) | |
893 | continue; | |
894 | if (type > RTAX_MAX) | |
895 | return -EINVAL; | |
896 | ||
897 | if (type == RTAX_CC_ALGO) { | |
898 | char tmp[TCP_CA_NAME_MAX]; | |
899 | ||
900 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
901 | val = tcp_ca_get_key_by_name(tmp); | |
902 | if (val == TCP_CA_UNSPEC) | |
903 | return -EINVAL; | |
904 | } else { | |
905 | val = nla_get_u32(nla); | |
906 | } | |
907 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
908 | val = 65535 - 40; | |
909 | if (type == RTAX_MTU && val > 65535 - 15) | |
910 | val = 65535 - 15; | |
b8d3e416 DB |
911 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
912 | return -EINVAL; | |
6cf9dfd3 FW |
913 | fi->fib_metrics[type - 1] = val; |
914 | } | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
4e902c57 | 919 | struct fib_info *fib_create_info(struct fib_config *cfg) |
1da177e4 LT |
920 | { |
921 | int err; | |
922 | struct fib_info *fi = NULL; | |
923 | struct fib_info *ofi; | |
1da177e4 | 924 | int nhs = 1; |
7462bd74 | 925 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 926 | |
4c8237cd DM |
927 | if (cfg->fc_type > RTN_MAX) |
928 | goto err_inval; | |
929 | ||
1da177e4 | 930 | /* Fast check to catch the most weird cases */ |
4e902c57 | 931 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) |
1da177e4 LT |
932 | goto err_inval; |
933 | ||
934 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
935 | if (cfg->fc_mp) { |
936 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len); | |
1da177e4 LT |
937 | if (nhs == 0) |
938 | goto err_inval; | |
939 | } | |
940 | #endif | |
1da177e4 LT |
941 | |
942 | err = -ENOBUFS; | |
123b9731 DM |
943 | if (fib_info_cnt >= fib_info_hash_size) { |
944 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
945 | struct hlist_head *new_info_hash; |
946 | struct hlist_head *new_laddrhash; | |
947 | unsigned int bytes; | |
948 | ||
949 | if (!new_size) | |
d94ce9b2 | 950 | new_size = 16; |
1da177e4 | 951 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
952 | new_info_hash = fib_info_hash_alloc(bytes); |
953 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 954 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
955 | fib_info_hash_free(new_info_hash, bytes); |
956 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 957 | } else |
123b9731 | 958 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 959 | |
123b9731 | 960 | if (!fib_info_hash_size) |
1da177e4 LT |
961 | goto failure; |
962 | } | |
963 | ||
0da974f4 | 964 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
51456b29 | 965 | if (!fi) |
1da177e4 | 966 | goto failure; |
aeefa1ec | 967 | fib_info_cnt++; |
725d1e1b DM |
968 | if (cfg->fc_mx) { |
969 | fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
970 | if (!fi->fib_metrics) | |
971 | goto failure; | |
972 | } else | |
973 | fi->fib_metrics = (u32 *) dst_default_metrics; | |
1da177e4 | 974 | |
efd7ef1c | 975 | fi->fib_net = net; |
4e902c57 | 976 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 977 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
978 | fi->fib_flags = cfg->fc_flags; |
979 | fi->fib_priority = cfg->fc_priority; | |
980 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 981 | fi->fib_type = cfg->fc_type; |
1da177e4 LT |
982 | |
983 | fi->fib_nhs = nhs; | |
984 | change_nexthops(fi) { | |
71fceff0 | 985 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 986 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
987 | if (!nexthop_nh->nh_pcpu_rth_output) |
988 | goto failure; | |
1da177e4 LT |
989 | } endfor_nexthops(fi) |
990 | ||
6cf9dfd3 FW |
991 | err = fib_convert_metrics(fi, cfg); |
992 | if (err) | |
993 | goto failure; | |
1da177e4 | 994 | |
4e902c57 | 995 | if (cfg->fc_mp) { |
1da177e4 | 996 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
997 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg); |
998 | if (err != 0) | |
1da177e4 | 999 | goto failure; |
4e902c57 | 1000 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) |
1da177e4 | 1001 | goto err_inval; |
4e902c57 | 1002 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) |
1da177e4 | 1003 | goto err_inval; |
c7066f70 | 1004 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1005 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) |
1da177e4 LT |
1006 | goto err_inval; |
1007 | #endif | |
1008 | #else | |
1009 | goto err_inval; | |
1010 | #endif | |
1011 | } else { | |
1012 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 | 1013 | |
571e7226 RP |
1014 | if (cfg->fc_encap) { |
1015 | struct lwtunnel_state *lwtstate; | |
1016 | struct net_device *dev = NULL; | |
1017 | ||
1018 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) | |
1019 | goto err_inval; | |
1020 | if (cfg->fc_oif) | |
1021 | dev = __dev_get_by_index(net, cfg->fc_oif); | |
1022 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
127eb7cd TH |
1023 | cfg->fc_encap, AF_INET, cfg, |
1024 | &lwtstate); | |
571e7226 RP |
1025 | if (err) |
1026 | goto failure; | |
1027 | ||
5a6228a0 | 1028 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
571e7226 | 1029 | } |
4e902c57 TG |
1030 | nh->nh_oif = cfg->fc_oif; |
1031 | nh->nh_gw = cfg->fc_gw; | |
1032 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 1033 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1034 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 1035 | if (nh->nh_tclassid) |
f4530fa5 | 1036 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 1037 | #endif |
1da177e4 LT |
1038 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1039 | nh->nh_weight = 1; | |
1040 | #endif | |
1041 | } | |
1042 | ||
4e902c57 TG |
1043 | if (fib_props[cfg->fc_type].error) { |
1044 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) | |
1da177e4 LT |
1045 | goto err_inval; |
1046 | goto link_it; | |
4c8237cd DM |
1047 | } else { |
1048 | switch (cfg->fc_type) { | |
1049 | case RTN_UNICAST: | |
1050 | case RTN_LOCAL: | |
1051 | case RTN_BROADCAST: | |
1052 | case RTN_ANYCAST: | |
1053 | case RTN_MULTICAST: | |
1054 | break; | |
1055 | default: | |
1056 | goto err_inval; | |
1057 | } | |
1da177e4 LT |
1058 | } |
1059 | ||
4e902c57 | 1060 | if (cfg->fc_scope > RT_SCOPE_HOST) |
1da177e4 LT |
1061 | goto err_inval; |
1062 | ||
4e902c57 | 1063 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
1064 | struct fib_nh *nh = fi->fib_nh; |
1065 | ||
1066 | /* Local address is added. */ | |
1067 | if (nhs != 1 || nh->nh_gw) | |
1068 | goto err_inval; | |
1069 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
7462bd74 | 1070 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 | 1071 | err = -ENODEV; |
51456b29 | 1072 | if (!nh->nh_dev) |
1da177e4 LT |
1073 | goto failure; |
1074 | } else { | |
8a3d0316 AG |
1075 | int linkdown = 0; |
1076 | ||
1da177e4 | 1077 | change_nexthops(fi) { |
6a31d2a9 ED |
1078 | err = fib_check_nh(cfg, fi, nexthop_nh); |
1079 | if (err != 0) | |
1da177e4 | 1080 | goto failure; |
8a3d0316 AG |
1081 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
1082 | linkdown++; | |
1da177e4 | 1083 | } endfor_nexthops(fi) |
8a3d0316 AG |
1084 | if (linkdown == fi->fib_nhs) |
1085 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1086 | } |
1087 | ||
021dd3b8 DA |
1088 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) |
1089 | goto err_inval; | |
1da177e4 | 1090 | |
1fc050a1 | 1091 | change_nexthops(fi) { |
436c3b66 | 1092 | fib_info_update_nh_saddr(net, nexthop_nh); |
1fc050a1 DM |
1093 | } endfor_nexthops(fi) |
1094 | ||
1da177e4 | 1095 | link_it: |
6a31d2a9 ED |
1096 | ofi = fib_find_info(fi); |
1097 | if (ofi) { | |
1da177e4 LT |
1098 | fi->fib_dead = 1; |
1099 | free_fib_info(fi); | |
1100 | ofi->fib_treeref++; | |
1101 | return ofi; | |
1102 | } | |
1103 | ||
1104 | fi->fib_treeref++; | |
1105 | atomic_inc(&fi->fib_clntref); | |
832b4c5e | 1106 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1107 | hlist_add_head(&fi->fib_hash, |
1108 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1109 | if (fi->fib_prefsrc) { | |
1110 | struct hlist_head *head; | |
1111 | ||
1112 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1113 | hlist_add_head(&fi->fib_lhash, head); | |
1114 | } | |
1115 | change_nexthops(fi) { | |
1116 | struct hlist_head *head; | |
1117 | unsigned int hash; | |
1118 | ||
71fceff0 | 1119 | if (!nexthop_nh->nh_dev) |
1da177e4 | 1120 | continue; |
71fceff0 | 1121 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 1122 | head = &fib_info_devhash[hash]; |
71fceff0 | 1123 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 1124 | } endfor_nexthops(fi) |
832b4c5e | 1125 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1126 | return fi; |
1127 | ||
1128 | err_inval: | |
1129 | err = -EINVAL; | |
1130 | ||
1131 | failure: | |
e905a9ed | 1132 | if (fi) { |
1da177e4 LT |
1133 | fi->fib_dead = 1; |
1134 | free_fib_info(fi); | |
1135 | } | |
4e902c57 TG |
1136 | |
1137 | return ERR_PTR(err); | |
1da177e4 LT |
1138 | } |
1139 | ||
15e47304 | 1140 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1141 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1142 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1143 | { |
be403ea1 | 1144 | struct nlmsghdr *nlh; |
1da177e4 | 1145 | struct rtmsg *rtm; |
1da177e4 | 1146 | |
15e47304 | 1147 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1148 | if (!nlh) |
26932566 | 1149 | return -EMSGSIZE; |
be403ea1 TG |
1150 | |
1151 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1152 | rtm->rtm_family = AF_INET; |
1153 | rtm->rtm_dst_len = dst_len; | |
1154 | rtm->rtm_src_len = 0; | |
1155 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1156 | if (tb_id < 256) |
1157 | rtm->rtm_table = tb_id; | |
1158 | else | |
1159 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1160 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1161 | goto nla_put_failure; | |
1da177e4 LT |
1162 | rtm->rtm_type = type; |
1163 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1164 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1165 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1166 | |
f3756b79 | 1167 | if (rtm->rtm_dst_len && |
930345ea | 1168 | nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 DM |
1169 | goto nla_put_failure; |
1170 | if (fi->fib_priority && | |
1171 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1172 | goto nla_put_failure; | |
1da177e4 | 1173 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
be403ea1 TG |
1174 | goto nla_put_failure; |
1175 | ||
f3756b79 | 1176 | if (fi->fib_prefsrc && |
930345ea | 1177 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1178 | goto nla_put_failure; |
1da177e4 | 1179 | if (fi->fib_nhs == 1) { |
0eeb075f AG |
1180 | struct in_device *in_dev; |
1181 | ||
f3756b79 | 1182 | if (fi->fib_nh->nh_gw && |
930345ea | 1183 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
f3756b79 DM |
1184 | goto nla_put_failure; |
1185 | if (fi->fib_nh->nh_oif && | |
1186 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1187 | goto nla_put_failure; | |
0eeb075f | 1188 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1189 | in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev); |
0eeb075f AG |
1190 | if (in_dev && |
1191 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1192 | rtm->rtm_flags |= RTNH_F_DEAD; | |
1193 | } | |
c7066f70 | 1194 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1195 | if (fi->fib_nh[0].nh_tclassid && |
1196 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1197 | goto nla_put_failure; | |
8265abc0 | 1198 | #endif |
571e7226 RP |
1199 | if (fi->fib_nh->nh_lwtstate) |
1200 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate); | |
1da177e4 LT |
1201 | } |
1202 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1203 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1204 | struct rtnexthop *rtnh; |
1205 | struct nlattr *mp; | |
1206 | ||
1207 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
51456b29 | 1208 | if (!mp) |
be403ea1 | 1209 | goto nla_put_failure; |
1da177e4 LT |
1210 | |
1211 | for_nexthops(fi) { | |
0eeb075f AG |
1212 | struct in_device *in_dev; |
1213 | ||
be403ea1 | 1214 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
51456b29 | 1215 | if (!rtnh) |
be403ea1 TG |
1216 | goto nla_put_failure; |
1217 | ||
1218 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
0eeb075f | 1219 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1220 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0eeb075f AG |
1221 | if (in_dev && |
1222 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1223 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
1224 | } | |
be403ea1 TG |
1225 | rtnh->rtnh_hops = nh->nh_weight - 1; |
1226 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1227 | ||
f3756b79 | 1228 | if (nh->nh_gw && |
930345ea | 1229 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
f3756b79 | 1230 | goto nla_put_failure; |
c7066f70 | 1231 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1232 | if (nh->nh_tclassid && |
1233 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1234 | goto nla_put_failure; | |
8265abc0 | 1235 | #endif |
571e7226 RP |
1236 | if (nh->nh_lwtstate) |
1237 | lwtunnel_fill_encap(skb, nh->nh_lwtstate); | |
be403ea1 TG |
1238 | /* length of rtnetlink header + attributes */ |
1239 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1240 | } endfor_nexthops(fi); |
be403ea1 TG |
1241 | |
1242 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1243 | } |
1244 | #endif | |
053c095a JB |
1245 | nlmsg_end(skb, nlh); |
1246 | return 0; | |
1da177e4 | 1247 | |
be403ea1 | 1248 | nla_put_failure: |
26932566 PM |
1249 | nlmsg_cancel(skb, nlh); |
1250 | return -EMSGSIZE; | |
1da177e4 LT |
1251 | } |
1252 | ||
1da177e4 | 1253 | /* |
6a31d2a9 ED |
1254 | * Update FIB if: |
1255 | * - local address disappeared -> we must delete all the entries | |
1256 | * referring to it. | |
1257 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1258 | */ |
4814bdbd | 1259 | int fib_sync_down_addr(struct net *net, __be32 local) |
1da177e4 LT |
1260 | { |
1261 | int ret = 0; | |
85326fa5 DL |
1262 | unsigned int hash = fib_laddr_hashfn(local); |
1263 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
85326fa5 | 1264 | struct fib_info *fi; |
1da177e4 | 1265 | |
51456b29 | 1266 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1267 | return 0; |
1da177e4 | 1268 | |
b67bfe0d | 1269 | hlist_for_each_entry(fi, head, fib_lhash) { |
09ad9bc7 | 1270 | if (!net_eq(fi->fib_net, net)) |
4814bdbd | 1271 | continue; |
85326fa5 DL |
1272 | if (fi->fib_prefsrc == local) { |
1273 | fi->fib_flags |= RTNH_F_DEAD; | |
1274 | ret++; | |
1da177e4 LT |
1275 | } |
1276 | } | |
85326fa5 DL |
1277 | return ret; |
1278 | } | |
1279 | ||
8a3d0316 | 1280 | int fib_sync_down_dev(struct net_device *dev, unsigned long event) |
85326fa5 DL |
1281 | { |
1282 | int ret = 0; | |
1283 | int scope = RT_SCOPE_NOWHERE; | |
1284 | struct fib_info *prev_fi = NULL; | |
1285 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1286 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1287 | struct fib_nh *nh; |
1da177e4 | 1288 | |
8a3d0316 AG |
1289 | if (event == NETDEV_UNREGISTER || |
1290 | event == NETDEV_DOWN) | |
85326fa5 | 1291 | scope = -1; |
1da177e4 | 1292 | |
b67bfe0d | 1293 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1294 | struct fib_info *fi = nh->nh_parent; |
1295 | int dead; | |
1da177e4 | 1296 | |
85326fa5 DL |
1297 | BUG_ON(!fi->fib_nhs); |
1298 | if (nh->nh_dev != dev || fi == prev_fi) | |
1299 | continue; | |
1300 | prev_fi = fi; | |
1301 | dead = 0; | |
1302 | change_nexthops(fi) { | |
6a31d2a9 | 1303 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1304 | dead++; |
71fceff0 DM |
1305 | else if (nexthop_nh->nh_dev == dev && |
1306 | nexthop_nh->nh_scope != scope) { | |
8a3d0316 AG |
1307 | switch (event) { |
1308 | case NETDEV_DOWN: | |
1309 | case NETDEV_UNREGISTER: | |
1310 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1311 | /* fall through */ | |
1312 | case NETDEV_CHANGE: | |
1313 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; | |
1314 | break; | |
1315 | } | |
1da177e4 | 1316 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
85326fa5 | 1317 | spin_lock_bh(&fib_multipath_lock); |
71fceff0 DM |
1318 | fi->fib_power -= nexthop_nh->nh_power; |
1319 | nexthop_nh->nh_power = 0; | |
85326fa5 | 1320 | spin_unlock_bh(&fib_multipath_lock); |
1da177e4 | 1321 | #endif |
85326fa5 DL |
1322 | dead++; |
1323 | } | |
1da177e4 | 1324 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 AG |
1325 | if (event == NETDEV_UNREGISTER && |
1326 | nexthop_nh->nh_dev == dev) { | |
85326fa5 DL |
1327 | dead = fi->fib_nhs; |
1328 | break; | |
1da177e4 | 1329 | } |
85326fa5 DL |
1330 | #endif |
1331 | } endfor_nexthops(fi) | |
1332 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1333 | switch (event) { |
1334 | case NETDEV_DOWN: | |
1335 | case NETDEV_UNREGISTER: | |
1336 | fi->fib_flags |= RTNH_F_DEAD; | |
1337 | /* fall through */ | |
1338 | case NETDEV_CHANGE: | |
1339 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1340 | break; | |
1341 | } | |
85326fa5 | 1342 | ret++; |
1da177e4 LT |
1343 | } |
1344 | } | |
1345 | ||
1346 | return ret; | |
1347 | } | |
1348 | ||
0c838ff1 | 1349 | /* Must be invoked inside of an RCU protected region. */ |
2392debc | 1350 | void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
1351 | { |
1352 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 1353 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 1354 | struct fib_table *tb = res->table; |
18a912e9 | 1355 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 1356 | int order = -1, last_idx = -1; |
2392debc JA |
1357 | struct fib_alias *fa, *fa1 = NULL; |
1358 | u32 last_prio = res->fi->fib_priority; | |
1359 | u8 last_tos = 0; | |
0c838ff1 | 1360 | |
56315f9e | 1361 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 DM |
1362 | struct fib_info *next_fi = fa->fa_info; |
1363 | ||
18a912e9 JA |
1364 | if (fa->fa_slen != slen) |
1365 | continue; | |
2392debc JA |
1366 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
1367 | continue; | |
18a912e9 JA |
1368 | if (fa->tb_id != tb->tb_id) |
1369 | continue; | |
2392debc JA |
1370 | if (next_fi->fib_priority > last_prio && |
1371 | fa->fa_tos == last_tos) { | |
1372 | if (last_tos) | |
1373 | continue; | |
1374 | break; | |
1375 | } | |
1376 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
1377 | continue; | |
1378 | last_tos = fa->fa_tos; | |
1379 | last_prio = next_fi->fib_priority; | |
1380 | ||
37e826c5 | 1381 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1382 | fa->fa_type != RTN_UNICAST) |
1383 | continue; | |
0c838ff1 DM |
1384 | if (!next_fi->fib_nh[0].nh_gw || |
1385 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1386 | continue; | |
1387 | ||
1388 | fib_alias_accessed(fa); | |
1389 | ||
51456b29 | 1390 | if (!fi) { |
0c838ff1 DM |
1391 | if (next_fi != res->fi) |
1392 | break; | |
2392debc | 1393 | fa1 = fa; |
0c838ff1 | 1394 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 1395 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 1396 | fib_result_assign(res, fi); |
2392debc | 1397 | fa1->fa_default = order; |
0c838ff1 DM |
1398 | goto out; |
1399 | } | |
1400 | fi = next_fi; | |
1401 | order++; | |
1402 | } | |
1403 | ||
51456b29 | 1404 | if (order <= 0 || !fi) { |
2392debc JA |
1405 | if (fa1) |
1406 | fa1->fa_default = -1; | |
0c838ff1 DM |
1407 | goto out; |
1408 | } | |
1409 | ||
1410 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 1411 | fa1->fa_default)) { |
0c838ff1 | 1412 | fib_result_assign(res, fi); |
2392debc | 1413 | fa1->fa_default = order; |
0c838ff1 DM |
1414 | goto out; |
1415 | } | |
1416 | ||
1417 | if (last_idx >= 0) | |
1418 | fib_result_assign(res, last_resort); | |
2392debc | 1419 | fa1->fa_default = last_idx; |
0c838ff1 | 1420 | out: |
31d40937 | 1421 | return; |
0c838ff1 DM |
1422 | } |
1423 | ||
1da177e4 | 1424 | /* |
6a31d2a9 ED |
1425 | * Dead device goes up. We wake up dead nexthops. |
1426 | * It takes sense only on multipath routes. | |
1da177e4 | 1427 | */ |
8a3d0316 | 1428 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
1da177e4 LT |
1429 | { |
1430 | struct fib_info *prev_fi; | |
1431 | unsigned int hash; | |
1432 | struct hlist_head *head; | |
1da177e4 LT |
1433 | struct fib_nh *nh; |
1434 | int ret; | |
1435 | ||
6a31d2a9 | 1436 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1437 | return 0; |
1438 | ||
1439 | prev_fi = NULL; | |
1440 | hash = fib_devindex_hashfn(dev->ifindex); | |
1441 | head = &fib_info_devhash[hash]; | |
1442 | ret = 0; | |
1443 | ||
b67bfe0d | 1444 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1445 | struct fib_info *fi = nh->nh_parent; |
1446 | int alive; | |
1447 | ||
1448 | BUG_ON(!fi->fib_nhs); | |
1449 | if (nh->nh_dev != dev || fi == prev_fi) | |
1450 | continue; | |
1451 | ||
1452 | prev_fi = fi; | |
1453 | alive = 0; | |
1454 | change_nexthops(fi) { | |
8a3d0316 | 1455 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
1da177e4 LT |
1456 | alive++; |
1457 | continue; | |
1458 | } | |
51456b29 | 1459 | if (!nexthop_nh->nh_dev || |
6a31d2a9 | 1460 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1461 | continue; |
71fceff0 DM |
1462 | if (nexthop_nh->nh_dev != dev || |
1463 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1464 | continue; |
1465 | alive++; | |
8a3d0316 | 1466 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1da177e4 | 1467 | spin_lock_bh(&fib_multipath_lock); |
71fceff0 | 1468 | nexthop_nh->nh_power = 0; |
8a3d0316 | 1469 | nexthop_nh->nh_flags &= ~nh_flags; |
1da177e4 | 1470 | spin_unlock_bh(&fib_multipath_lock); |
8a3d0316 AG |
1471 | #else |
1472 | nexthop_nh->nh_flags &= ~nh_flags; | |
1473 | #endif | |
1da177e4 LT |
1474 | } endfor_nexthops(fi) |
1475 | ||
1476 | if (alive > 0) { | |
8a3d0316 | 1477 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
1478 | ret++; |
1479 | } | |
1480 | } | |
1481 | ||
1482 | return ret; | |
1483 | } | |
1484 | ||
8a3d0316 AG |
1485 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1486 | ||
1da177e4 | 1487 | /* |
6a31d2a9 ED |
1488 | * The algorithm is suboptimal, but it provides really |
1489 | * fair weighted route distribution. | |
1da177e4 | 1490 | */ |
1b7fe593 | 1491 | void fib_select_multipath(struct fib_result *res) |
1da177e4 LT |
1492 | { |
1493 | struct fib_info *fi = res->fi; | |
0eeb075f | 1494 | struct in_device *in_dev; |
1da177e4 LT |
1495 | int w; |
1496 | ||
1497 | spin_lock_bh(&fib_multipath_lock); | |
1498 | if (fi->fib_power <= 0) { | |
1499 | int power = 0; | |
1500 | change_nexthops(fi) { | |
0eeb075f AG |
1501 | in_dev = __in_dev_get_rcu(nexthop_nh->nh_dev); |
1502 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) | |
1503 | continue; | |
1504 | if (in_dev && | |
1505 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1506 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) | |
1507 | continue; | |
1508 | power += nexthop_nh->nh_weight; | |
1509 | nexthop_nh->nh_power = nexthop_nh->nh_weight; | |
1da177e4 LT |
1510 | } endfor_nexthops(fi); |
1511 | fi->fib_power = power; | |
1512 | if (power <= 0) { | |
1513 | spin_unlock_bh(&fib_multipath_lock); | |
1514 | /* Race condition: route has just become dead. */ | |
1515 | res->nh_sel = 0; | |
1516 | return; | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | ||
1521 | /* w should be random number [0..fi->fib_power-1], | |
6a31d2a9 | 1522 | * it is pretty bad approximation. |
1da177e4 LT |
1523 | */ |
1524 | ||
1525 | w = jiffies % fi->fib_power; | |
1526 | ||
1527 | change_nexthops(fi) { | |
6a31d2a9 | 1528 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD) && |
71fceff0 | 1529 | nexthop_nh->nh_power) { |
6a31d2a9 ED |
1530 | w -= nexthop_nh->nh_power; |
1531 | if (w <= 0) { | |
71fceff0 | 1532 | nexthop_nh->nh_power--; |
1da177e4 LT |
1533 | fi->fib_power--; |
1534 | res->nh_sel = nhsel; | |
1535 | spin_unlock_bh(&fib_multipath_lock); | |
1536 | return; | |
1537 | } | |
1538 | } | |
1539 | } endfor_nexthops(fi); | |
1540 | ||
1541 | /* Race condition: route has just become dead. */ | |
1542 | res->nh_sel = 0; | |
1543 | spin_unlock_bh(&fib_multipath_lock); | |
1544 | } | |
1545 | #endif |