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Commit | Line | Data |
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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> |
1da177e4 LT |
47 | |
48 | #include "fib_lookup.h" | |
49 | ||
832b4c5e | 50 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
51 | static struct hlist_head *fib_info_hash; |
52 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 53 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
54 | static unsigned int fib_info_cnt; |
55 | ||
56 | #define DEVINDEX_HASHBITS 8 | |
57 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
58 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
59 | ||
60 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1da177e4 | 61 | |
6a31d2a9 ED |
62 | #define for_nexthops(fi) { \ |
63 | int nhsel; const struct fib_nh *nh; \ | |
64 | for (nhsel = 0, nh = (fi)->fib_nh; \ | |
65 | nhsel < (fi)->fib_nhs; \ | |
66 | nh++, nhsel++) | |
67 | ||
68 | #define change_nexthops(fi) { \ | |
69 | int nhsel; struct fib_nh *nexthop_nh; \ | |
70 | for (nhsel = 0, nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
71 | nhsel < (fi)->fib_nhs; \ | |
72 | nexthop_nh++, nhsel++) | |
1da177e4 LT |
73 | |
74 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
75 | ||
76 | /* Hope, that gcc will optimize it to get rid of dummy loop */ | |
77 | ||
6a31d2a9 ED |
78 | #define for_nexthops(fi) { \ |
79 | int nhsel; const struct fib_nh *nh = (fi)->fib_nh; \ | |
80 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 | 81 | |
6a31d2a9 ED |
82 | #define change_nexthops(fi) { \ |
83 | int nhsel; \ | |
84 | struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
85 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 LT |
86 | |
87 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
88 | ||
89 | #define endfor_nexthops(fi) } | |
90 | ||
91 | ||
3be0686b | 92 | const struct fib_prop fib_props[RTN_MAX + 1] = { |
6a31d2a9 | 93 | [RTN_UNSPEC] = { |
1da177e4 LT |
94 | .error = 0, |
95 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
96 | }, |
97 | [RTN_UNICAST] = { | |
1da177e4 LT |
98 | .error = 0, |
99 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
100 | }, |
101 | [RTN_LOCAL] = { | |
1da177e4 LT |
102 | .error = 0, |
103 | .scope = RT_SCOPE_HOST, | |
6a31d2a9 ED |
104 | }, |
105 | [RTN_BROADCAST] = { | |
1da177e4 LT |
106 | .error = 0, |
107 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
108 | }, |
109 | [RTN_ANYCAST] = { | |
1da177e4 LT |
110 | .error = 0, |
111 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
112 | }, |
113 | [RTN_MULTICAST] = { | |
1da177e4 LT |
114 | .error = 0, |
115 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
116 | }, |
117 | [RTN_BLACKHOLE] = { | |
1da177e4 LT |
118 | .error = -EINVAL, |
119 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
120 | }, |
121 | [RTN_UNREACHABLE] = { | |
1da177e4 LT |
122 | .error = -EHOSTUNREACH, |
123 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
124 | }, |
125 | [RTN_PROHIBIT] = { | |
1da177e4 LT |
126 | .error = -EACCES, |
127 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
128 | }, |
129 | [RTN_THROW] = { | |
1da177e4 LT |
130 | .error = -EAGAIN, |
131 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
132 | }, |
133 | [RTN_NAT] = { | |
1da177e4 LT |
134 | .error = -EINVAL, |
135 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
136 | }, |
137 | [RTN_XRESOLVE] = { | |
1da177e4 LT |
138 | .error = -EINVAL, |
139 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 | 140 | }, |
1da177e4 LT |
141 | }; |
142 | ||
c5038a83 DM |
143 | static void rt_fibinfo_free(struct rtable __rcu **rtp) |
144 | { | |
145 | struct rtable *rt = rcu_dereference_protected(*rtp, 1); | |
146 | ||
147 | if (!rt) | |
148 | return; | |
149 | ||
150 | /* Not even needed : RCU_INIT_POINTER(*rtp, NULL); | |
151 | * because we waited an RCU grace period before calling | |
152 | * free_fib_info_rcu() | |
153 | */ | |
154 | ||
155 | dst_free(&rt->dst); | |
156 | } | |
157 | ||
4895c771 DM |
158 | static void free_nh_exceptions(struct fib_nh *nh) |
159 | { | |
caa41527 | 160 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
161 | int i; |
162 | ||
caa41527 ED |
163 | hash = rcu_dereference_protected(nh->nh_exceptions, 1); |
164 | if (!hash) | |
165 | return; | |
4895c771 DM |
166 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
167 | struct fib_nh_exception *fnhe; | |
168 | ||
5abf7f7e | 169 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
4895c771 DM |
170 | while (fnhe) { |
171 | struct fib_nh_exception *next; | |
172 | ||
5abf7f7e | 173 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
c5038a83 | 174 | |
2ffae99d TT |
175 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
176 | rt_fibinfo_free(&fnhe->fnhe_rth_output); | |
c5038a83 | 177 | |
4895c771 DM |
178 | kfree(fnhe); |
179 | ||
180 | fnhe = next; | |
181 | } | |
182 | } | |
183 | kfree(hash); | |
184 | } | |
185 | ||
c5038a83 | 186 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
d26b3a7c ED |
187 | { |
188 | int cpu; | |
189 | ||
190 | if (!rtp) | |
191 | return; | |
192 | ||
193 | for_each_possible_cpu(cpu) { | |
194 | struct rtable *rt; | |
195 | ||
196 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); | |
197 | if (rt) | |
198 | dst_free(&rt->dst); | |
199 | } | |
200 | free_percpu(rtp); | |
201 | } | |
202 | ||
1da177e4 | 203 | /* Release a nexthop info record */ |
19c1ea14 YZ |
204 | static void free_fib_info_rcu(struct rcu_head *head) |
205 | { | |
206 | struct fib_info *fi = container_of(head, struct fib_info, rcu); | |
3fb07daf | 207 | struct dst_metrics *m; |
19c1ea14 | 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 | ||
3fb07daf ED |
218 | m = fi->fib_metrics; |
219 | if (m != &dst_default_metrics && atomic_dec_and_test(&m->refcnt)) | |
220 | kfree(m); | |
19c1ea14 YZ |
221 | kfree(fi); |
222 | } | |
1da177e4 LT |
223 | |
224 | void free_fib_info(struct fib_info *fi) | |
225 | { | |
226 | if (fi->fib_dead == 0) { | |
058bd4d2 | 227 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
228 | return; |
229 | } | |
1da177e4 | 230 | fib_info_cnt--; |
7a9bc9b8 DM |
231 | #ifdef CONFIG_IP_ROUTE_CLASSID |
232 | change_nexthops(fi) { | |
233 | if (nexthop_nh->nh_tclassid) | |
f4530fa5 | 234 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
7a9bc9b8 DM |
235 | } endfor_nexthops(fi); |
236 | #endif | |
19c1ea14 | 237 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 | 238 | } |
b423cb10 | 239 | EXPORT_SYMBOL_GPL(free_fib_info); |
1da177e4 LT |
240 | |
241 | void fib_release_info(struct fib_info *fi) | |
242 | { | |
832b4c5e | 243 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
244 | if (fi && --fi->fib_treeref == 0) { |
245 | hlist_del(&fi->fib_hash); | |
246 | if (fi->fib_prefsrc) | |
247 | hlist_del(&fi->fib_lhash); | |
248 | change_nexthops(fi) { | |
71fceff0 | 249 | if (!nexthop_nh->nh_dev) |
1da177e4 | 250 | continue; |
71fceff0 | 251 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
252 | } endfor_nexthops(fi) |
253 | fi->fib_dead = 1; | |
254 | fib_info_put(fi); | |
255 | } | |
832b4c5e | 256 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
257 | } |
258 | ||
6a31d2a9 | 259 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
260 | { |
261 | const struct fib_nh *onh = ofi->fib_nh; | |
262 | ||
263 | for_nexthops(fi) { | |
264 | if (nh->nh_oif != onh->nh_oif || | |
265 | nh->nh_gw != onh->nh_gw || | |
266 | nh->nh_scope != onh->nh_scope || | |
267 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
268 | nh->nh_weight != onh->nh_weight || | |
269 | #endif | |
c7066f70 | 270 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
271 | nh->nh_tclassid != onh->nh_tclassid || |
272 | #endif | |
571e7226 | 273 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
8a3d0316 | 274 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
1da177e4 LT |
275 | return -1; |
276 | onh++; | |
277 | } endfor_nexthops(fi); | |
278 | return 0; | |
279 | } | |
280 | ||
88ebc72f DM |
281 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
282 | { | |
283 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
284 | ||
285 | return (val ^ | |
286 | (val >> DEVINDEX_HASHBITS) ^ | |
287 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
288 | } | |
289 | ||
1da177e4 LT |
290 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
291 | { | |
123b9731 | 292 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
293 | unsigned int val = fi->fib_nhs; |
294 | ||
37e826c5 | 295 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 296 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 297 | val ^= fi->fib_priority; |
88ebc72f DM |
298 | for_nexthops(fi) { |
299 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
300 | } endfor_nexthops(fi) | |
1da177e4 LT |
301 | |
302 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
303 | } | |
304 | ||
305 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
306 | { | |
307 | struct hlist_head *head; | |
1da177e4 LT |
308 | struct fib_info *fi; |
309 | unsigned int hash; | |
310 | ||
311 | hash = fib_info_hashfn(nfi); | |
312 | head = &fib_info_hash[hash]; | |
313 | ||
b67bfe0d | 314 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 315 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 316 | continue; |
1da177e4 LT |
317 | if (fi->fib_nhs != nfi->fib_nhs) |
318 | continue; | |
319 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 320 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
321 | nfi->fib_prefsrc == fi->fib_prefsrc && |
322 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 323 | nfi->fib_type == fi->fib_type && |
1da177e4 | 324 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 325 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 326 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
1da177e4 LT |
327 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
328 | return fi; | |
329 | } | |
330 | ||
331 | return NULL; | |
332 | } | |
333 | ||
1da177e4 | 334 | /* Check, that the gateway is already configured. |
6a31d2a9 | 335 | * Used only by redirect accept routine. |
1da177e4 | 336 | */ |
d878e72e | 337 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
338 | { |
339 | struct hlist_head *head; | |
1da177e4 LT |
340 | struct fib_nh *nh; |
341 | unsigned int hash; | |
342 | ||
832b4c5e | 343 | spin_lock(&fib_info_lock); |
1da177e4 LT |
344 | |
345 | hash = fib_devindex_hashfn(dev->ifindex); | |
346 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 347 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
348 | if (nh->nh_dev == dev && |
349 | nh->nh_gw == gw && | |
6a31d2a9 | 350 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 351 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
352 | return 0; |
353 | } | |
354 | } | |
355 | ||
832b4c5e | 356 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
357 | |
358 | return -1; | |
359 | } | |
360 | ||
339bf98f TG |
361 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
362 | { | |
363 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
364 | + nla_total_size(4) /* RTA_TABLE */ | |
365 | + nla_total_size(4) /* RTA_DST */ | |
366 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
367 | + nla_total_size(4) /* RTA_PREFSRC */ |
368 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
369 | |
370 | /* space for nested metrics */ | |
371 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
372 | ||
373 | if (fi->fib_nhs) { | |
571e7226 | 374 | size_t nh_encapsize = 0; |
339bf98f TG |
375 | /* Also handles the special case fib_nhs == 1 */ |
376 | ||
377 | /* each nexthop is packed in an attribute */ | |
378 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
379 | ||
380 | /* may contain flow and gateway attribute */ | |
381 | nhsize += 2 * nla_total_size(4); | |
382 | ||
571e7226 RP |
383 | /* grab encap info */ |
384 | for_nexthops(fi) { | |
385 | if (nh->nh_lwtstate) { | |
386 | /* RTA_ENCAP_TYPE */ | |
387 | nh_encapsize += lwtunnel_get_encap_size( | |
388 | nh->nh_lwtstate); | |
389 | /* RTA_ENCAP */ | |
390 | nh_encapsize += nla_total_size(2); | |
391 | } | |
392 | } endfor_nexthops(fi); | |
393 | ||
339bf98f | 394 | /* all nexthops are packed in a nested attribute */ |
571e7226 RP |
395 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
396 | nh_encapsize); | |
397 | ||
339bf98f TG |
398 | } |
399 | ||
400 | return payload; | |
401 | } | |
402 | ||
81f7bf6c | 403 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 404 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 405 | unsigned int nlm_flags) |
1da177e4 LT |
406 | { |
407 | struct sk_buff *skb; | |
4e902c57 | 408 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 409 | int err = -ENOBUFS; |
1da177e4 | 410 | |
339bf98f | 411 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 412 | if (!skb) |
f21c7bc5 | 413 | goto errout; |
1da177e4 | 414 | |
15e47304 | 415 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 416 | fa->fa_type, key, dst_len, |
b8f55831 | 417 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
418 | if (err < 0) { |
419 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
420 | WARN_ON(err == -EMSGSIZE); | |
421 | kfree_skb(skb); | |
422 | goto errout; | |
423 | } | |
15e47304 | 424 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
425 | info->nlh, GFP_KERNEL); |
426 | return; | |
f21c7bc5 TG |
427 | errout: |
428 | if (err < 0) | |
4d1169c1 | 429 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
430 | } |
431 | ||
c9cb6b6e SH |
432 | static int fib_detect_death(struct fib_info *fi, int order, |
433 | struct fib_info **last_resort, int *last_idx, | |
434 | int dflt) | |
1da177e4 LT |
435 | { |
436 | struct neighbour *n; | |
437 | int state = NUD_NONE; | |
438 | ||
439 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
440 | if (n) { | |
441 | state = n->nud_state; | |
442 | neigh_release(n); | |
88f64320 JA |
443 | } else { |
444 | return 0; | |
1da177e4 | 445 | } |
d9319100 | 446 | if (state == NUD_REACHABLE) |
1da177e4 | 447 | return 0; |
6a31d2a9 | 448 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 449 | return 0; |
6a31d2a9 | 450 | if ((state & NUD_VALID) || |
88f64320 | 451 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
1da177e4 LT |
452 | *last_resort = fi; |
453 | *last_idx = order; | |
454 | } | |
455 | return 1; | |
456 | } | |
457 | ||
458 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
459 | ||
6d8422a1 DA |
460 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining, |
461 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
462 | { |
463 | int nhs = 0; | |
1da177e4 | 464 | |
4e902c57 | 465 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 466 | nhs++; |
4e902c57 TG |
467 | rtnh = rtnh_next(rtnh, &remaining); |
468 | } | |
469 | ||
470 | /* leftover implies invalid nexthop configuration, discard it */ | |
c3ab2b4e DA |
471 | if (remaining > 0) { |
472 | NL_SET_ERR_MSG(extack, | |
473 | "Invalid nexthop configuration - extra data after nexthops"); | |
474 | nhs = 0; | |
475 | } | |
476 | ||
477 | return nhs; | |
1da177e4 LT |
478 | } |
479 | ||
4e902c57 | 480 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
6d8422a1 DA |
481 | int remaining, struct fib_config *cfg, |
482 | struct netlink_ext_ack *extack) | |
1da177e4 | 483 | { |
571e7226 RP |
484 | int ret; |
485 | ||
1da177e4 | 486 | change_nexthops(fi) { |
4e902c57 TG |
487 | int attrlen; |
488 | ||
c3ab2b4e DA |
489 | if (!rtnh_ok(rtnh, remaining)) { |
490 | NL_SET_ERR_MSG(extack, | |
491 | "Invalid nexthop configuration - extra data after nexthop"); | |
1da177e4 | 492 | return -EINVAL; |
c3ab2b4e | 493 | } |
4e902c57 | 494 | |
c3ab2b4e DA |
495 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
496 | NL_SET_ERR_MSG(extack, | |
497 | "Invalid flags for nexthop - can not contain DEAD or LINKDOWN"); | |
80610229 | 498 | return -EINVAL; |
c3ab2b4e | 499 | } |
80610229 | 500 | |
71fceff0 DM |
501 | nexthop_nh->nh_flags = |
502 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
503 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
504 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
505 | |
506 | attrlen = rtnh_attrlen(rtnh); | |
507 | if (attrlen > 0) { | |
508 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
509 | ||
510 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 511 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
c7066f70 | 512 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 513 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 514 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 515 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 516 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 517 | #endif |
571e7226 RP |
518 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
519 | if (nla) { | |
520 | struct lwtunnel_state *lwtstate; | |
571e7226 RP |
521 | struct nlattr *nla_entype; |
522 | ||
523 | nla_entype = nla_find(attrs, attrlen, | |
524 | RTA_ENCAP_TYPE); | |
c3ab2b4e DA |
525 | if (!nla_entype) { |
526 | NL_SET_BAD_ATTR(extack, nla); | |
527 | NL_SET_ERR_MSG(extack, | |
528 | "Encap type is missing"); | |
571e7226 | 529 | goto err_inval; |
c3ab2b4e | 530 | } |
30357d7d DA |
531 | |
532 | ret = lwtunnel_build_state(nla_get_u16( | |
571e7226 | 533 | nla_entype), |
127eb7cd TH |
534 | nla, AF_INET, cfg, |
535 | &lwtstate); | |
571e7226 RP |
536 | if (ret) |
537 | goto errout; | |
5a6228a0 ND |
538 | nexthop_nh->nh_lwtstate = |
539 | lwtstate_get(lwtstate); | |
571e7226 | 540 | } |
1da177e4 | 541 | } |
4e902c57 TG |
542 | |
543 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 544 | } endfor_nexthops(fi); |
4e902c57 | 545 | |
1da177e4 | 546 | return 0; |
571e7226 RP |
547 | |
548 | err_inval: | |
549 | ret = -EINVAL; | |
550 | ||
551 | errout: | |
552 | return ret; | |
1da177e4 LT |
553 | } |
554 | ||
0e884c78 PN |
555 | static void fib_rebalance(struct fib_info *fi) |
556 | { | |
557 | int total; | |
558 | int w; | |
559 | struct in_device *in_dev; | |
560 | ||
561 | if (fi->fib_nhs < 2) | |
562 | return; | |
563 | ||
564 | total = 0; | |
565 | for_nexthops(fi) { | |
566 | if (nh->nh_flags & RTNH_F_DEAD) | |
567 | continue; | |
568 | ||
51161aa9 | 569 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0e884c78 PN |
570 | |
571 | if (in_dev && | |
572 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
573 | nh->nh_flags & RTNH_F_LINKDOWN) | |
574 | continue; | |
575 | ||
576 | total += nh->nh_weight; | |
577 | } endfor_nexthops(fi); | |
578 | ||
579 | w = 0; | |
580 | change_nexthops(fi) { | |
581 | int upper_bound; | |
582 | ||
51161aa9 | 583 | in_dev = __in_dev_get_rtnl(nexthop_nh->nh_dev); |
0e884c78 PN |
584 | |
585 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) { | |
586 | upper_bound = -1; | |
587 | } else if (in_dev && | |
588 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
589 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) { | |
590 | upper_bound = -1; | |
591 | } else { | |
592 | w += nexthop_nh->nh_weight; | |
0a837fe4 PN |
593 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
594 | total) - 1; | |
0e884c78 PN |
595 | } |
596 | ||
597 | atomic_set(&nexthop_nh->nh_upper_bound, upper_bound); | |
598 | } endfor_nexthops(fi); | |
0e884c78 PN |
599 | } |
600 | ||
601 | static inline void fib_add_weight(struct fib_info *fi, | |
602 | const struct fib_nh *nh) | |
603 | { | |
604 | fi->fib_weight += nh->nh_weight; | |
605 | } | |
606 | ||
607 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
608 | ||
609 | #define fib_rebalance(fi) do { } while (0) | |
610 | #define fib_add_weight(fi, nh) do { } while (0) | |
611 | ||
612 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
1da177e4 | 613 | |
30357d7d | 614 | static int fib_encap_match(u16 encap_type, |
e01286ef | 615 | struct nlattr *encap, |
30357d7d | 616 | const struct fib_nh *nh, |
127eb7cd | 617 | const struct fib_config *cfg) |
571e7226 RP |
618 | { |
619 | struct lwtunnel_state *lwtstate; | |
df383e62 | 620 | int ret, result = 0; |
571e7226 RP |
621 | |
622 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
623 | return 0; | |
624 | ||
30357d7d | 625 | ret = lwtunnel_build_state(encap_type, encap, |
127eb7cd | 626 | AF_INET, cfg, &lwtstate); |
df383e62 JB |
627 | if (!ret) { |
628 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); | |
629 | lwtstate_free(lwtstate); | |
630 | } | |
571e7226 | 631 | |
df383e62 | 632 | return result; |
571e7226 RP |
633 | } |
634 | ||
4e902c57 | 635 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
1da177e4 LT |
636 | { |
637 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
638 | struct rtnexthop *rtnh; |
639 | int remaining; | |
1da177e4 LT |
640 | #endif |
641 | ||
4e902c57 | 642 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
643 | return 1; |
644 | ||
4e902c57 | 645 | if (cfg->fc_oif || cfg->fc_gw) { |
571e7226 | 646 | if (cfg->fc_encap) { |
30357d7d DA |
647 | if (fib_encap_match(cfg->fc_encap_type, |
648 | cfg->fc_encap, fi->fib_nh, cfg)) | |
571e7226 RP |
649 | return 1; |
650 | } | |
4e902c57 TG |
651 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
652 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
653 | return 0; |
654 | return 1; | |
655 | } | |
656 | ||
657 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 658 | if (!cfg->fc_mp) |
1da177e4 | 659 | return 0; |
4e902c57 TG |
660 | |
661 | rtnh = cfg->fc_mp; | |
662 | remaining = cfg->fc_mp_len; | |
e905a9ed | 663 | |
1da177e4 | 664 | for_nexthops(fi) { |
4e902c57 | 665 | int attrlen; |
1da177e4 | 666 | |
4e902c57 | 667 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 668 | return -EINVAL; |
4e902c57 TG |
669 | |
670 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 671 | return 1; |
4e902c57 TG |
672 | |
673 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 674 | if (attrlen > 0) { |
4e902c57 TG |
675 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
676 | ||
677 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 678 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
1da177e4 | 679 | return 1; |
c7066f70 | 680 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
681 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
682 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
683 | return 1; |
684 | #endif | |
685 | } | |
4e902c57 TG |
686 | |
687 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
688 | } endfor_nexthops(fi); |
689 | #endif | |
690 | return 0; | |
691 | } | |
692 | ||
693 | ||
694 | /* | |
6a31d2a9 ED |
695 | * Picture |
696 | * ------- | |
697 | * | |
698 | * Semantics of nexthop is very messy by historical reasons. | |
699 | * We have to take into account, that: | |
700 | * a) gateway can be actually local interface address, | |
701 | * so that gatewayed route is direct. | |
702 | * b) gateway must be on-link address, possibly | |
703 | * described not by an ifaddr, but also by a direct route. | |
704 | * c) If both gateway and interface are specified, they should not | |
705 | * contradict. | |
706 | * d) If we use tunnel routes, gateway could be not on-link. | |
707 | * | |
708 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
709 | * results in pretty ugly and hairy code with obscure logic. | |
710 | * | |
711 | * I chose to generalized it instead, so that the size | |
712 | * of code does not increase practically, but it becomes | |
713 | * much more general. | |
714 | * Every prefix is assigned a "scope" value: "host" is local address, | |
715 | * "link" is direct route, | |
716 | * [ ... "site" ... "interior" ... ] | |
717 | * and "universe" is true gateway route with global meaning. | |
718 | * | |
719 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
720 | * where gw must have narrower scope. This recursion stops | |
721 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
722 | * which means that gw is forced to be on link. | |
723 | * | |
724 | * Code is still hairy, but now it is apparently logically | |
725 | * consistent and very flexible. F.e. as by-product it allows | |
726 | * to co-exists in peace independent exterior and interior | |
727 | * routing processes. | |
728 | * | |
729 | * Normally it looks as following. | |
730 | * | |
731 | * {universe prefix} -> (gw, oif) [scope link] | |
732 | * | | |
733 | * |-> {link prefix} -> (gw, oif) [scope local] | |
734 | * | | |
735 | * |-> {local prefix} (terminal node) | |
1da177e4 | 736 | */ |
4e902c57 | 737 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
6d8422a1 | 738 | struct fib_nh *nh, struct netlink_ext_ack *extack) |
1da177e4 | 739 | { |
127eb7cd | 740 | int err = 0; |
86167a37 | 741 | struct net *net; |
6a31d2a9 | 742 | struct net_device *dev; |
1da177e4 | 743 | |
86167a37 | 744 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
745 | if (nh->nh_gw) { |
746 | struct fib_result res; | |
747 | ||
6a31d2a9 | 748 | if (nh->nh_flags & RTNH_F_ONLINK) { |
30bbaa19 | 749 | unsigned int addr_type; |
1da177e4 | 750 | |
c3ab2b4e DA |
751 | if (cfg->fc_scope >= RT_SCOPE_LINK) { |
752 | NL_SET_ERR_MSG(extack, | |
753 | "Nexthop has invalid scope"); | |
1da177e4 | 754 | return -EINVAL; |
c3ab2b4e | 755 | } |
6a31d2a9 ED |
756 | dev = __dev_get_by_index(net, nh->nh_oif); |
757 | if (!dev) | |
1da177e4 | 758 | return -ENODEV; |
c3ab2b4e DA |
759 | if (!(dev->flags & IFF_UP)) { |
760 | NL_SET_ERR_MSG(extack, | |
761 | "Nexthop device is not up"); | |
1da177e4 | 762 | return -ENETDOWN; |
c3ab2b4e | 763 | } |
30bbaa19 | 764 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
c3ab2b4e DA |
765 | if (addr_type != RTN_UNICAST) { |
766 | NL_SET_ERR_MSG(extack, | |
767 | "Nexthop has invalid gateway"); | |
30bbaa19 | 768 | return -EINVAL; |
c3ab2b4e | 769 | } |
8a3d0316 AG |
770 | if (!netif_carrier_ok(dev)) |
771 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
772 | nh->nh_dev = dev; |
773 | dev_hold(dev); | |
774 | nh->nh_scope = RT_SCOPE_LINK; | |
775 | return 0; | |
776 | } | |
ebc0ffae | 777 | rcu_read_lock(); |
1da177e4 | 778 | { |
3bfd8472 | 779 | struct fib_table *tbl = NULL; |
9ade2286 DM |
780 | struct flowi4 fl4 = { |
781 | .daddr = nh->nh_gw, | |
782 | .flowi4_scope = cfg->fc_scope + 1, | |
783 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 784 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 785 | }; |
1da177e4 LT |
786 | |
787 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
788 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
789 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
3bfd8472 DA |
790 | |
791 | if (cfg->fc_table) | |
792 | tbl = fib_get_table(net, cfg->fc_table); | |
793 | ||
794 | if (tbl) | |
795 | err = fib_table_lookup(tbl, &fl4, &res, | |
1e313678 ED |
796 | FIB_LOOKUP_IGNORE_LINKSTATE | |
797 | FIB_LOOKUP_NOREF); | |
4c9bcd11 DA |
798 | |
799 | /* on error or if no table given do full lookup. This | |
800 | * is needed for example when nexthops are in the local | |
801 | * table rather than the given table | |
802 | */ | |
803 | if (!tbl || err) { | |
3bfd8472 DA |
804 | err = fib_lookup(net, &fl4, &res, |
805 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
4c9bcd11 DA |
806 | } |
807 | ||
ebc0ffae | 808 | if (err) { |
c3ab2b4e DA |
809 | NL_SET_ERR_MSG(extack, |
810 | "Nexthop has invalid gateway"); | |
ebc0ffae | 811 | rcu_read_unlock(); |
1da177e4 | 812 | return err; |
ebc0ffae | 813 | } |
1da177e4 LT |
814 | } |
815 | err = -EINVAL; | |
c3ab2b4e DA |
816 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) { |
817 | NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway"); | |
1da177e4 | 818 | goto out; |
c3ab2b4e | 819 | } |
1da177e4 LT |
820 | nh->nh_scope = res.scope; |
821 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 | 822 | nh->nh_dev = dev = FIB_RES_DEV(res); |
c3ab2b4e DA |
823 | if (!dev) { |
824 | NL_SET_ERR_MSG(extack, | |
825 | "No egress device for nexthop gateway"); | |
1da177e4 | 826 | goto out; |
c3ab2b4e | 827 | } |
6a31d2a9 | 828 | dev_hold(dev); |
8a3d0316 AG |
829 | if (!netif_carrier_ok(dev)) |
830 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 831 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
832 | } else { |
833 | struct in_device *in_dev; | |
834 | ||
c3ab2b4e DA |
835 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) { |
836 | NL_SET_ERR_MSG(extack, | |
837 | "Invalid flags for nexthop - PERVASIVE and ONLINK can not be set"); | |
1da177e4 | 838 | return -EINVAL; |
c3ab2b4e | 839 | } |
8723e1b4 ED |
840 | rcu_read_lock(); |
841 | err = -ENODEV; | |
86167a37 | 842 | in_dev = inetdev_by_index(net, nh->nh_oif); |
51456b29 | 843 | if (!in_dev) |
8723e1b4 ED |
844 | goto out; |
845 | err = -ENETDOWN; | |
c3ab2b4e DA |
846 | if (!(in_dev->dev->flags & IFF_UP)) { |
847 | NL_SET_ERR_MSG(extack, "Device for nexthop is not up"); | |
8723e1b4 | 848 | goto out; |
c3ab2b4e | 849 | } |
1da177e4 LT |
850 | nh->nh_dev = in_dev->dev; |
851 | dev_hold(nh->nh_dev); | |
852 | nh->nh_scope = RT_SCOPE_HOST; | |
8a3d0316 AG |
853 | if (!netif_carrier_ok(nh->nh_dev)) |
854 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 855 | err = 0; |
1da177e4 | 856 | } |
8723e1b4 ED |
857 | out: |
858 | rcu_read_unlock(); | |
859 | return err; | |
1da177e4 LT |
860 | } |
861 | ||
81f7bf6c | 862 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 863 | { |
123b9731 | 864 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 865 | |
6a31d2a9 ED |
866 | return ((__force u32)val ^ |
867 | ((__force u32)val >> 7) ^ | |
868 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
869 | } |
870 | ||
123b9731 | 871 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
872 | { |
873 | if (bytes <= PAGE_SIZE) | |
88f83491 | 874 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
875 | else |
876 | return (struct hlist_head *) | |
6a31d2a9 ED |
877 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
878 | get_order(bytes)); | |
1da177e4 LT |
879 | } |
880 | ||
123b9731 | 881 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
882 | { |
883 | if (!hash) | |
884 | return; | |
885 | ||
886 | if (bytes <= PAGE_SIZE) | |
887 | kfree(hash); | |
888 | else | |
889 | free_pages((unsigned long) hash, get_order(bytes)); | |
890 | } | |
891 | ||
123b9731 DM |
892 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
893 | struct hlist_head *new_laddrhash, | |
894 | unsigned int new_size) | |
1da177e4 | 895 | { |
b7656e7f | 896 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 897 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 898 | unsigned int i, bytes; |
1da177e4 | 899 | |
832b4c5e | 900 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
901 | old_info_hash = fib_info_hash; |
902 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 903 | fib_info_hash_size = new_size; |
1da177e4 LT |
904 | |
905 | for (i = 0; i < old_size; i++) { | |
906 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 907 | struct hlist_node *n; |
1da177e4 LT |
908 | struct fib_info *fi; |
909 | ||
b67bfe0d | 910 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
911 | struct hlist_head *dest; |
912 | unsigned int new_hash; | |
913 | ||
1da177e4 LT |
914 | new_hash = fib_info_hashfn(fi); |
915 | dest = &new_info_hash[new_hash]; | |
916 | hlist_add_head(&fi->fib_hash, dest); | |
917 | } | |
918 | } | |
919 | fib_info_hash = new_info_hash; | |
920 | ||
921 | for (i = 0; i < old_size; i++) { | |
922 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 923 | struct hlist_node *n; |
1da177e4 LT |
924 | struct fib_info *fi; |
925 | ||
b67bfe0d | 926 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
927 | struct hlist_head *ldest; |
928 | unsigned int new_hash; | |
929 | ||
1da177e4 LT |
930 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
931 | ldest = &new_laddrhash[new_hash]; | |
932 | hlist_add_head(&fi->fib_lhash, ldest); | |
933 | } | |
934 | } | |
935 | fib_info_laddrhash = new_laddrhash; | |
936 | ||
832b4c5e | 937 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
938 | |
939 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
940 | fib_info_hash_free(old_info_hash, bytes); |
941 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
942 | } |
943 | ||
436c3b66 DM |
944 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
945 | { | |
946 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
947 | nh->nh_gw, | |
37e826c5 | 948 | nh->nh_parent->fib_scope); |
436c3b66 DM |
949 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
950 | ||
951 | return nh->nh_saddr; | |
952 | } | |
953 | ||
021dd3b8 DA |
954 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
955 | { | |
956 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
957 | fib_prefsrc != cfg->fc_dst) { | |
9b8ff518 | 958 | u32 tb_id = cfg->fc_table; |
e1b8d903 | 959 | int rc; |
021dd3b8 DA |
960 | |
961 | if (tb_id == RT_TABLE_MAIN) | |
962 | tb_id = RT_TABLE_LOCAL; | |
963 | ||
e1b8d903 DA |
964 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
965 | fib_prefsrc, tb_id); | |
966 | ||
967 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { | |
968 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
969 | fib_prefsrc, RT_TABLE_LOCAL); | |
021dd3b8 | 970 | } |
e1b8d903 DA |
971 | |
972 | if (rc != RTN_LOCAL) | |
973 | return false; | |
021dd3b8 DA |
974 | } |
975 | return true; | |
976 | } | |
977 | ||
6cf9dfd3 FW |
978 | static int |
979 | fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) | |
980 | { | |
c3a8d947 | 981 | bool ecn_ca = false; |
6cf9dfd3 FW |
982 | struct nlattr *nla; |
983 | int remaining; | |
984 | ||
985 | if (!cfg->fc_mx) | |
986 | return 0; | |
987 | ||
988 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
989 | int type = nla_type(nla); | |
990 | u32 val; | |
991 | ||
992 | if (!type) | |
993 | continue; | |
994 | if (type > RTAX_MAX) | |
995 | return -EINVAL; | |
996 | ||
997 | if (type == RTAX_CC_ALGO) { | |
998 | char tmp[TCP_CA_NAME_MAX]; | |
999 | ||
1000 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
c3a8d947 | 1001 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
6cf9dfd3 FW |
1002 | if (val == TCP_CA_UNSPEC) |
1003 | return -EINVAL; | |
1004 | } else { | |
1005 | val = nla_get_u32(nla); | |
1006 | } | |
1007 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
1008 | val = 65535 - 40; | |
1009 | if (type == RTAX_MTU && val > 65535 - 15) | |
1010 | val = 65535 - 15; | |
626abd59 PA |
1011 | if (type == RTAX_HOPLIMIT && val > 255) |
1012 | val = 255; | |
b8d3e416 DB |
1013 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1014 | return -EINVAL; | |
3fb07daf | 1015 | fi->fib_metrics->metrics[type - 1] = val; |
6cf9dfd3 FW |
1016 | } |
1017 | ||
c3a8d947 | 1018 | if (ecn_ca) |
3fb07daf | 1019 | fi->fib_metrics->metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; |
c3a8d947 | 1020 | |
6cf9dfd3 FW |
1021 | return 0; |
1022 | } | |
1023 | ||
6d8422a1 DA |
1024 | struct fib_info *fib_create_info(struct fib_config *cfg, |
1025 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1026 | { |
1027 | int err; | |
1028 | struct fib_info *fi = NULL; | |
1029 | struct fib_info *ofi; | |
1da177e4 | 1030 | int nhs = 1; |
7462bd74 | 1031 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 1032 | |
4c8237cd DM |
1033 | if (cfg->fc_type > RTN_MAX) |
1034 | goto err_inval; | |
1035 | ||
1da177e4 | 1036 | /* Fast check to catch the most weird cases */ |
c3ab2b4e DA |
1037 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) { |
1038 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1039 | goto err_inval; |
c3ab2b4e | 1040 | } |
1da177e4 | 1041 | |
c3ab2b4e DA |
1042 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
1043 | NL_SET_ERR_MSG(extack, | |
1044 | "Invalid rtm_flags - can not contain DEAD or LINKDOWN"); | |
80610229 | 1045 | goto err_inval; |
c3ab2b4e | 1046 | } |
80610229 | 1047 | |
1da177e4 | 1048 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 | 1049 | if (cfg->fc_mp) { |
6d8422a1 | 1050 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len, extack); |
1da177e4 LT |
1051 | if (nhs == 0) |
1052 | goto err_inval; | |
1053 | } | |
1054 | #endif | |
1da177e4 LT |
1055 | |
1056 | err = -ENOBUFS; | |
123b9731 DM |
1057 | if (fib_info_cnt >= fib_info_hash_size) { |
1058 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
1059 | struct hlist_head *new_info_hash; |
1060 | struct hlist_head *new_laddrhash; | |
1061 | unsigned int bytes; | |
1062 | ||
1063 | if (!new_size) | |
d94ce9b2 | 1064 | new_size = 16; |
1da177e4 | 1065 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
1066 | new_info_hash = fib_info_hash_alloc(bytes); |
1067 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 1068 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
1069 | fib_info_hash_free(new_info_hash, bytes); |
1070 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 1071 | } else |
123b9731 | 1072 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 1073 | |
123b9731 | 1074 | if (!fib_info_hash_size) |
1da177e4 LT |
1075 | goto failure; |
1076 | } | |
1077 | ||
0da974f4 | 1078 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
51456b29 | 1079 | if (!fi) |
1da177e4 | 1080 | goto failure; |
aeefa1ec | 1081 | fib_info_cnt++; |
725d1e1b | 1082 | if (cfg->fc_mx) { |
3fb07daf | 1083 | fi->fib_metrics = kzalloc(sizeof(*fi->fib_metrics), GFP_KERNEL); |
725d1e1b DM |
1084 | if (!fi->fib_metrics) |
1085 | goto failure; | |
3fb07daf | 1086 | atomic_set(&fi->fib_metrics->refcnt, 1); |
725d1e1b | 1087 | } else |
3fb07daf | 1088 | fi->fib_metrics = (struct dst_metrics *)&dst_default_metrics; |
1da177e4 | 1089 | |
efd7ef1c | 1090 | fi->fib_net = net; |
4e902c57 | 1091 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 1092 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
1093 | fi->fib_flags = cfg->fc_flags; |
1094 | fi->fib_priority = cfg->fc_priority; | |
1095 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 1096 | fi->fib_type = cfg->fc_type; |
5a56a0b3 | 1097 | fi->fib_tb_id = cfg->fc_table; |
1da177e4 LT |
1098 | |
1099 | fi->fib_nhs = nhs; | |
1100 | change_nexthops(fi) { | |
71fceff0 | 1101 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 1102 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
1103 | if (!nexthop_nh->nh_pcpu_rth_output) |
1104 | goto failure; | |
1da177e4 LT |
1105 | } endfor_nexthops(fi) |
1106 | ||
6cf9dfd3 FW |
1107 | err = fib_convert_metrics(fi, cfg); |
1108 | if (err) | |
1109 | goto failure; | |
1da177e4 | 1110 | |
4e902c57 | 1111 | if (cfg->fc_mp) { |
1da177e4 | 1112 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6d8422a1 | 1113 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg, extack); |
4e902c57 | 1114 | if (err != 0) |
1da177e4 | 1115 | goto failure; |
c3ab2b4e DA |
1116 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) { |
1117 | NL_SET_ERR_MSG(extack, | |
1118 | "Nexthop device index does not match RTA_OIF"); | |
1da177e4 | 1119 | goto err_inval; |
c3ab2b4e DA |
1120 | } |
1121 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) { | |
1122 | NL_SET_ERR_MSG(extack, | |
1123 | "Nexthop gateway does not match RTA_GATEWAY"); | |
1da177e4 | 1124 | goto err_inval; |
c3ab2b4e | 1125 | } |
c7066f70 | 1126 | #ifdef CONFIG_IP_ROUTE_CLASSID |
c3ab2b4e DA |
1127 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) { |
1128 | NL_SET_ERR_MSG(extack, | |
1129 | "Nexthop class id does not match RTA_FLOW"); | |
1da177e4 | 1130 | goto err_inval; |
c3ab2b4e | 1131 | } |
1da177e4 LT |
1132 | #endif |
1133 | #else | |
c3ab2b4e DA |
1134 | NL_SET_ERR_MSG(extack, |
1135 | "Multipath support not enabled in kernel"); | |
1da177e4 LT |
1136 | goto err_inval; |
1137 | #endif | |
1138 | } else { | |
1139 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 | 1140 | |
571e7226 RP |
1141 | if (cfg->fc_encap) { |
1142 | struct lwtunnel_state *lwtstate; | |
571e7226 | 1143 | |
c3ab2b4e DA |
1144 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) { |
1145 | NL_SET_ERR_MSG(extack, | |
1146 | "LWT encap type not specified"); | |
571e7226 | 1147 | goto err_inval; |
c3ab2b4e | 1148 | } |
30357d7d | 1149 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd TH |
1150 | cfg->fc_encap, AF_INET, cfg, |
1151 | &lwtstate); | |
571e7226 RP |
1152 | if (err) |
1153 | goto failure; | |
1154 | ||
5a6228a0 | 1155 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
571e7226 | 1156 | } |
4e902c57 TG |
1157 | nh->nh_oif = cfg->fc_oif; |
1158 | nh->nh_gw = cfg->fc_gw; | |
1159 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 1160 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1161 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 1162 | if (nh->nh_tclassid) |
f4530fa5 | 1163 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 1164 | #endif |
1da177e4 LT |
1165 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1166 | nh->nh_weight = 1; | |
1167 | #endif | |
1168 | } | |
1169 | ||
4e902c57 | 1170 | if (fib_props[cfg->fc_type].error) { |
c3ab2b4e DA |
1171 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) { |
1172 | NL_SET_ERR_MSG(extack, | |
1173 | "Gateway, device and multipath can not be specified for this route type"); | |
1da177e4 | 1174 | goto err_inval; |
c3ab2b4e | 1175 | } |
1da177e4 | 1176 | goto link_it; |
4c8237cd DM |
1177 | } else { |
1178 | switch (cfg->fc_type) { | |
1179 | case RTN_UNICAST: | |
1180 | case RTN_LOCAL: | |
1181 | case RTN_BROADCAST: | |
1182 | case RTN_ANYCAST: | |
1183 | case RTN_MULTICAST: | |
1184 | break; | |
1185 | default: | |
c3ab2b4e | 1186 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
4c8237cd DM |
1187 | goto err_inval; |
1188 | } | |
1da177e4 LT |
1189 | } |
1190 | ||
c3ab2b4e DA |
1191 | if (cfg->fc_scope > RT_SCOPE_HOST) { |
1192 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1193 | goto err_inval; |
c3ab2b4e | 1194 | } |
1da177e4 | 1195 | |
4e902c57 | 1196 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
1197 | struct fib_nh *nh = fi->fib_nh; |
1198 | ||
1199 | /* Local address is added. */ | |
c3ab2b4e DA |
1200 | if (nhs != 1) { |
1201 | NL_SET_ERR_MSG(extack, | |
1202 | "Route with host scope can not have multiple nexthops"); | |
6d8422a1 | 1203 | goto err_inval; |
c3ab2b4e DA |
1204 | } |
1205 | if (nh->nh_gw) { | |
1206 | NL_SET_ERR_MSG(extack, | |
1207 | "Route with host scope can not have a gateway"); | |
1da177e4 | 1208 | goto err_inval; |
c3ab2b4e | 1209 | } |
1da177e4 | 1210 | nh->nh_scope = RT_SCOPE_NOWHERE; |
7462bd74 | 1211 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 | 1212 | err = -ENODEV; |
51456b29 | 1213 | if (!nh->nh_dev) |
1da177e4 LT |
1214 | goto failure; |
1215 | } else { | |
8a3d0316 AG |
1216 | int linkdown = 0; |
1217 | ||
1da177e4 | 1218 | change_nexthops(fi) { |
6d8422a1 | 1219 | err = fib_check_nh(cfg, fi, nexthop_nh, extack); |
6a31d2a9 | 1220 | if (err != 0) |
1da177e4 | 1221 | goto failure; |
8a3d0316 AG |
1222 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
1223 | linkdown++; | |
1da177e4 | 1224 | } endfor_nexthops(fi) |
8a3d0316 AG |
1225 | if (linkdown == fi->fib_nhs) |
1226 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1227 | } |
1228 | ||
c3ab2b4e DA |
1229 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) { |
1230 | NL_SET_ERR_MSG(extack, "Invalid prefsrc address"); | |
021dd3b8 | 1231 | goto err_inval; |
c3ab2b4e | 1232 | } |
1da177e4 | 1233 | |
1fc050a1 | 1234 | change_nexthops(fi) { |
436c3b66 | 1235 | fib_info_update_nh_saddr(net, nexthop_nh); |
0e884c78 | 1236 | fib_add_weight(fi, nexthop_nh); |
1fc050a1 DM |
1237 | } endfor_nexthops(fi) |
1238 | ||
0e884c78 PN |
1239 | fib_rebalance(fi); |
1240 | ||
1da177e4 | 1241 | link_it: |
6a31d2a9 ED |
1242 | ofi = fib_find_info(fi); |
1243 | if (ofi) { | |
1da177e4 LT |
1244 | fi->fib_dead = 1; |
1245 | free_fib_info(fi); | |
1246 | ofi->fib_treeref++; | |
1247 | return ofi; | |
1248 | } | |
1249 | ||
1250 | fi->fib_treeref++; | |
1251 | atomic_inc(&fi->fib_clntref); | |
832b4c5e | 1252 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1253 | hlist_add_head(&fi->fib_hash, |
1254 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1255 | if (fi->fib_prefsrc) { | |
1256 | struct hlist_head *head; | |
1257 | ||
1258 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1259 | hlist_add_head(&fi->fib_lhash, head); | |
1260 | } | |
1261 | change_nexthops(fi) { | |
1262 | struct hlist_head *head; | |
1263 | unsigned int hash; | |
1264 | ||
71fceff0 | 1265 | if (!nexthop_nh->nh_dev) |
1da177e4 | 1266 | continue; |
71fceff0 | 1267 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 1268 | head = &fib_info_devhash[hash]; |
71fceff0 | 1269 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 1270 | } endfor_nexthops(fi) |
832b4c5e | 1271 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1272 | return fi; |
1273 | ||
1274 | err_inval: | |
1275 | err = -EINVAL; | |
1276 | ||
1277 | failure: | |
e905a9ed | 1278 | if (fi) { |
1da177e4 LT |
1279 | fi->fib_dead = 1; |
1280 | free_fib_info(fi); | |
1281 | } | |
4e902c57 TG |
1282 | |
1283 | return ERR_PTR(err); | |
1da177e4 LT |
1284 | } |
1285 | ||
15e47304 | 1286 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1287 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1288 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1289 | { |
be403ea1 | 1290 | struct nlmsghdr *nlh; |
1da177e4 | 1291 | struct rtmsg *rtm; |
1da177e4 | 1292 | |
15e47304 | 1293 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1294 | if (!nlh) |
26932566 | 1295 | return -EMSGSIZE; |
be403ea1 TG |
1296 | |
1297 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1298 | rtm->rtm_family = AF_INET; |
1299 | rtm->rtm_dst_len = dst_len; | |
1300 | rtm->rtm_src_len = 0; | |
1301 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1302 | if (tb_id < 256) |
1303 | rtm->rtm_table = tb_id; | |
1304 | else | |
1305 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1306 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1307 | goto nla_put_failure; | |
1da177e4 LT |
1308 | rtm->rtm_type = type; |
1309 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1310 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1311 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1312 | |
f3756b79 | 1313 | if (rtm->rtm_dst_len && |
930345ea | 1314 | nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 DM |
1315 | goto nla_put_failure; |
1316 | if (fi->fib_priority && | |
1317 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1318 | goto nla_put_failure; | |
3fb07daf | 1319 | if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0) |
be403ea1 TG |
1320 | goto nla_put_failure; |
1321 | ||
f3756b79 | 1322 | if (fi->fib_prefsrc && |
930345ea | 1323 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1324 | goto nla_put_failure; |
1da177e4 | 1325 | if (fi->fib_nhs == 1) { |
0eeb075f AG |
1326 | struct in_device *in_dev; |
1327 | ||
f3756b79 | 1328 | if (fi->fib_nh->nh_gw && |
930345ea | 1329 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
f3756b79 DM |
1330 | goto nla_put_failure; |
1331 | if (fi->fib_nh->nh_oif && | |
1332 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1333 | goto nla_put_failure; | |
0eeb075f | 1334 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1335 | in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev); |
0eeb075f AG |
1336 | if (in_dev && |
1337 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1338 | rtm->rtm_flags |= RTNH_F_DEAD; | |
1339 | } | |
c7066f70 | 1340 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1341 | if (fi->fib_nh[0].nh_tclassid && |
1342 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1343 | goto nla_put_failure; | |
8265abc0 | 1344 | #endif |
ea7a8085 DA |
1345 | if (fi->fib_nh->nh_lwtstate && |
1346 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate) < 0) | |
1347 | goto nla_put_failure; | |
1da177e4 LT |
1348 | } |
1349 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1350 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1351 | struct rtnexthop *rtnh; |
1352 | struct nlattr *mp; | |
1353 | ||
1354 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
51456b29 | 1355 | if (!mp) |
be403ea1 | 1356 | goto nla_put_failure; |
1da177e4 LT |
1357 | |
1358 | for_nexthops(fi) { | |
0eeb075f AG |
1359 | struct in_device *in_dev; |
1360 | ||
be403ea1 | 1361 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
51456b29 | 1362 | if (!rtnh) |
be403ea1 TG |
1363 | goto nla_put_failure; |
1364 | ||
1365 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
0eeb075f | 1366 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1367 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0eeb075f AG |
1368 | if (in_dev && |
1369 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1370 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
1371 | } | |
be403ea1 TG |
1372 | rtnh->rtnh_hops = nh->nh_weight - 1; |
1373 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1374 | ||
f3756b79 | 1375 | if (nh->nh_gw && |
930345ea | 1376 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
f3756b79 | 1377 | goto nla_put_failure; |
c7066f70 | 1378 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1379 | if (nh->nh_tclassid && |
1380 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1381 | goto nla_put_failure; | |
8265abc0 | 1382 | #endif |
ea7a8085 DA |
1383 | if (nh->nh_lwtstate && |
1384 | lwtunnel_fill_encap(skb, nh->nh_lwtstate) < 0) | |
1385 | goto nla_put_failure; | |
1386 | ||
be403ea1 TG |
1387 | /* length of rtnetlink header + attributes */ |
1388 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1389 | } endfor_nexthops(fi); |
be403ea1 TG |
1390 | |
1391 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1392 | } |
1393 | #endif | |
053c095a JB |
1394 | nlmsg_end(skb, nlh); |
1395 | return 0; | |
1da177e4 | 1396 | |
be403ea1 | 1397 | nla_put_failure: |
26932566 PM |
1398 | nlmsg_cancel(skb, nlh); |
1399 | return -EMSGSIZE; | |
1da177e4 LT |
1400 | } |
1401 | ||
1da177e4 | 1402 | /* |
6a31d2a9 ED |
1403 | * Update FIB if: |
1404 | * - local address disappeared -> we must delete all the entries | |
1405 | * referring to it. | |
1406 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1407 | */ |
5a56a0b3 | 1408 | int fib_sync_down_addr(struct net_device *dev, __be32 local) |
1da177e4 LT |
1409 | { |
1410 | int ret = 0; | |
85326fa5 DL |
1411 | unsigned int hash = fib_laddr_hashfn(local); |
1412 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
5a56a0b3 MT |
1413 | struct net *net = dev_net(dev); |
1414 | int tb_id = l3mdev_fib_table(dev); | |
85326fa5 | 1415 | struct fib_info *fi; |
1da177e4 | 1416 | |
51456b29 | 1417 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1418 | return 0; |
1da177e4 | 1419 | |
b67bfe0d | 1420 | hlist_for_each_entry(fi, head, fib_lhash) { |
5a56a0b3 MT |
1421 | if (!net_eq(fi->fib_net, net) || |
1422 | fi->fib_tb_id != tb_id) | |
4814bdbd | 1423 | continue; |
85326fa5 DL |
1424 | if (fi->fib_prefsrc == local) { |
1425 | fi->fib_flags |= RTNH_F_DEAD; | |
1426 | ret++; | |
1da177e4 LT |
1427 | } |
1428 | } | |
85326fa5 DL |
1429 | return ret; |
1430 | } | |
1431 | ||
982acb97 IS |
1432 | static int call_fib_nh_notifiers(struct fib_nh *fib_nh, |
1433 | enum fib_event_type event_type) | |
1434 | { | |
1435 | struct in_device *in_dev = __in_dev_get_rtnl(fib_nh->nh_dev); | |
1436 | struct fib_nh_notifier_info info = { | |
1437 | .fib_nh = fib_nh, | |
1438 | }; | |
1439 | ||
1440 | switch (event_type) { | |
1441 | case FIB_EVENT_NH_ADD: | |
1442 | if (fib_nh->nh_flags & RTNH_F_DEAD) | |
1443 | break; | |
1444 | if (IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1445 | fib_nh->nh_flags & RTNH_F_LINKDOWN) | |
1446 | break; | |
1447 | return call_fib_notifiers(dev_net(fib_nh->nh_dev), event_type, | |
1448 | &info.info); | |
1449 | case FIB_EVENT_NH_DEL: | |
1450 | if ((IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1451 | fib_nh->nh_flags & RTNH_F_LINKDOWN) || | |
1452 | (fib_nh->nh_flags & RTNH_F_DEAD)) | |
1453 | return call_fib_notifiers(dev_net(fib_nh->nh_dev), | |
1454 | event_type, &info.info); | |
1455 | default: | |
1456 | break; | |
1457 | } | |
1458 | ||
1459 | return NOTIFY_DONE; | |
1460 | } | |
1461 | ||
4f823def JA |
1462 | /* Event force Flags Description |
1463 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host | |
1464 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host | |
1465 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed | |
1466 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed | |
1467 | */ | |
1468 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) | |
85326fa5 DL |
1469 | { |
1470 | int ret = 0; | |
1471 | int scope = RT_SCOPE_NOWHERE; | |
1472 | struct fib_info *prev_fi = NULL; | |
1473 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1474 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1475 | struct fib_nh *nh; |
1da177e4 | 1476 | |
4f823def | 1477 | if (force) |
85326fa5 | 1478 | scope = -1; |
1da177e4 | 1479 | |
b67bfe0d | 1480 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1481 | struct fib_info *fi = nh->nh_parent; |
1482 | int dead; | |
1da177e4 | 1483 | |
85326fa5 DL |
1484 | BUG_ON(!fi->fib_nhs); |
1485 | if (nh->nh_dev != dev || fi == prev_fi) | |
1486 | continue; | |
1487 | prev_fi = fi; | |
1488 | dead = 0; | |
1489 | change_nexthops(fi) { | |
6a31d2a9 | 1490 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1491 | dead++; |
71fceff0 DM |
1492 | else if (nexthop_nh->nh_dev == dev && |
1493 | nexthop_nh->nh_scope != scope) { | |
8a3d0316 AG |
1494 | switch (event) { |
1495 | case NETDEV_DOWN: | |
1496 | case NETDEV_UNREGISTER: | |
1497 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1498 | /* fall through */ | |
1499 | case NETDEV_CHANGE: | |
1500 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; | |
1501 | break; | |
1502 | } | |
982acb97 IS |
1503 | call_fib_nh_notifiers(nexthop_nh, |
1504 | FIB_EVENT_NH_DEL); | |
85326fa5 DL |
1505 | dead++; |
1506 | } | |
1da177e4 | 1507 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 AG |
1508 | if (event == NETDEV_UNREGISTER && |
1509 | nexthop_nh->nh_dev == dev) { | |
85326fa5 DL |
1510 | dead = fi->fib_nhs; |
1511 | break; | |
1da177e4 | 1512 | } |
85326fa5 DL |
1513 | #endif |
1514 | } endfor_nexthops(fi) | |
1515 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1516 | switch (event) { |
1517 | case NETDEV_DOWN: | |
1518 | case NETDEV_UNREGISTER: | |
1519 | fi->fib_flags |= RTNH_F_DEAD; | |
1520 | /* fall through */ | |
1521 | case NETDEV_CHANGE: | |
1522 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1523 | break; | |
1524 | } | |
85326fa5 | 1525 | ret++; |
1da177e4 | 1526 | } |
0e884c78 PN |
1527 | |
1528 | fib_rebalance(fi); | |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | return ret; | |
1532 | } | |
1533 | ||
0c838ff1 | 1534 | /* Must be invoked inside of an RCU protected region. */ |
c7b371e3 | 1535 | static void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
1536 | { |
1537 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 1538 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 1539 | struct fib_table *tb = res->table; |
18a912e9 | 1540 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 1541 | int order = -1, last_idx = -1; |
2392debc JA |
1542 | struct fib_alias *fa, *fa1 = NULL; |
1543 | u32 last_prio = res->fi->fib_priority; | |
1544 | u8 last_tos = 0; | |
0c838ff1 | 1545 | |
56315f9e | 1546 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 DM |
1547 | struct fib_info *next_fi = fa->fa_info; |
1548 | ||
18a912e9 JA |
1549 | if (fa->fa_slen != slen) |
1550 | continue; | |
2392debc JA |
1551 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
1552 | continue; | |
18a912e9 JA |
1553 | if (fa->tb_id != tb->tb_id) |
1554 | continue; | |
2392debc JA |
1555 | if (next_fi->fib_priority > last_prio && |
1556 | fa->fa_tos == last_tos) { | |
1557 | if (last_tos) | |
1558 | continue; | |
1559 | break; | |
1560 | } | |
1561 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
1562 | continue; | |
1563 | last_tos = fa->fa_tos; | |
1564 | last_prio = next_fi->fib_priority; | |
1565 | ||
37e826c5 | 1566 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1567 | fa->fa_type != RTN_UNICAST) |
1568 | continue; | |
0c838ff1 DM |
1569 | if (!next_fi->fib_nh[0].nh_gw || |
1570 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1571 | continue; | |
1572 | ||
1573 | fib_alias_accessed(fa); | |
1574 | ||
51456b29 | 1575 | if (!fi) { |
0c838ff1 DM |
1576 | if (next_fi != res->fi) |
1577 | break; | |
2392debc | 1578 | fa1 = fa; |
0c838ff1 | 1579 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 1580 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 1581 | fib_result_assign(res, fi); |
2392debc | 1582 | fa1->fa_default = order; |
0c838ff1 DM |
1583 | goto out; |
1584 | } | |
1585 | fi = next_fi; | |
1586 | order++; | |
1587 | } | |
1588 | ||
51456b29 | 1589 | if (order <= 0 || !fi) { |
2392debc JA |
1590 | if (fa1) |
1591 | fa1->fa_default = -1; | |
0c838ff1 DM |
1592 | goto out; |
1593 | } | |
1594 | ||
1595 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 1596 | fa1->fa_default)) { |
0c838ff1 | 1597 | fib_result_assign(res, fi); |
2392debc | 1598 | fa1->fa_default = order; |
0c838ff1 DM |
1599 | goto out; |
1600 | } | |
1601 | ||
1602 | if (last_idx >= 0) | |
1603 | fib_result_assign(res, last_resort); | |
2392debc | 1604 | fa1->fa_default = last_idx; |
0c838ff1 | 1605 | out: |
31d40937 | 1606 | return; |
0c838ff1 DM |
1607 | } |
1608 | ||
1da177e4 | 1609 | /* |
6a31d2a9 ED |
1610 | * Dead device goes up. We wake up dead nexthops. |
1611 | * It takes sense only on multipath routes. | |
1da177e4 | 1612 | */ |
8a3d0316 | 1613 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
1da177e4 LT |
1614 | { |
1615 | struct fib_info *prev_fi; | |
1616 | unsigned int hash; | |
1617 | struct hlist_head *head; | |
1da177e4 LT |
1618 | struct fib_nh *nh; |
1619 | int ret; | |
1620 | ||
6a31d2a9 | 1621 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1622 | return 0; |
1623 | ||
c9b3292e JA |
1624 | if (nh_flags & RTNH_F_DEAD) { |
1625 | unsigned int flags = dev_get_flags(dev); | |
1626 | ||
1627 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1628 | nh_flags |= RTNH_F_LINKDOWN; | |
1629 | } | |
1630 | ||
1da177e4 LT |
1631 | prev_fi = NULL; |
1632 | hash = fib_devindex_hashfn(dev->ifindex); | |
1633 | head = &fib_info_devhash[hash]; | |
1634 | ret = 0; | |
1635 | ||
b67bfe0d | 1636 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1637 | struct fib_info *fi = nh->nh_parent; |
1638 | int alive; | |
1639 | ||
1640 | BUG_ON(!fi->fib_nhs); | |
1641 | if (nh->nh_dev != dev || fi == prev_fi) | |
1642 | continue; | |
1643 | ||
1644 | prev_fi = fi; | |
1645 | alive = 0; | |
1646 | change_nexthops(fi) { | |
8a3d0316 | 1647 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
1da177e4 LT |
1648 | alive++; |
1649 | continue; | |
1650 | } | |
51456b29 | 1651 | if (!nexthop_nh->nh_dev || |
6a31d2a9 | 1652 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1653 | continue; |
71fceff0 DM |
1654 | if (nexthop_nh->nh_dev != dev || |
1655 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1656 | continue; |
1657 | alive++; | |
8a3d0316 | 1658 | nexthop_nh->nh_flags &= ~nh_flags; |
982acb97 | 1659 | call_fib_nh_notifiers(nexthop_nh, FIB_EVENT_NH_ADD); |
1da177e4 LT |
1660 | } endfor_nexthops(fi) |
1661 | ||
1662 | if (alive > 0) { | |
8a3d0316 | 1663 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
1664 | ret++; |
1665 | } | |
0e884c78 PN |
1666 | |
1667 | fib_rebalance(fi); | |
1da177e4 LT |
1668 | } |
1669 | ||
1670 | return ret; | |
1671 | } | |
1672 | ||
8a3d0316 | 1673 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
a6db4494 DA |
1674 | static bool fib_good_nh(const struct fib_nh *nh) |
1675 | { | |
1676 | int state = NUD_REACHABLE; | |
1677 | ||
1678 | if (nh->nh_scope == RT_SCOPE_LINK) { | |
1679 | struct neighbour *n; | |
1680 | ||
1681 | rcu_read_lock_bh(); | |
1682 | ||
d985d151 ED |
1683 | n = __ipv4_neigh_lookup_noref(nh->nh_dev, |
1684 | (__force u32)nh->nh_gw); | |
a6db4494 DA |
1685 | if (n) |
1686 | state = n->nud_state; | |
1687 | ||
1688 | rcu_read_unlock_bh(); | |
1689 | } | |
1690 | ||
1691 | return !!(state & NUD_VALID); | |
1692 | } | |
8a3d0316 | 1693 | |
0e884c78 | 1694 | void fib_select_multipath(struct fib_result *res, int hash) |
1da177e4 LT |
1695 | { |
1696 | struct fib_info *fi = res->fi; | |
a6db4494 DA |
1697 | struct net *net = fi->fib_net; |
1698 | bool first = false; | |
1da177e4 | 1699 | |
0e884c78 PN |
1700 | for_nexthops(fi) { |
1701 | if (hash > atomic_read(&nh->nh_upper_bound)) | |
1702 | continue; | |
1da177e4 | 1703 | |
a6db4494 DA |
1704 | if (!net->ipv4.sysctl_fib_multipath_use_neigh || |
1705 | fib_good_nh(nh)) { | |
1706 | res->nh_sel = nhsel; | |
1707 | return; | |
1708 | } | |
1709 | if (!first) { | |
1710 | res->nh_sel = nhsel; | |
1711 | first = true; | |
1712 | } | |
1da177e4 | 1713 | } endfor_nexthops(fi); |
1da177e4 LT |
1714 | } |
1715 | #endif | |
3ce58d84 DA |
1716 | |
1717 | void fib_select_path(struct net *net, struct fib_result *res, | |
bf4e0a3d | 1718 | struct flowi4 *fl4, const struct sk_buff *skb) |
3ce58d84 | 1719 | { |
7a18c5b9 DA |
1720 | bool oif_check; |
1721 | ||
1722 | oif_check = (fl4->flowi4_oif == 0 || | |
1723 | fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF); | |
1724 | ||
3ce58d84 | 1725 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
7a18c5b9 | 1726 | if (res->fi->fib_nhs > 1 && oif_check) { |
bf4e0a3d | 1727 | int h = fib_multipath_hash(res->fi, fl4, skb); |
9920e48b | 1728 | |
bf4e0a3d | 1729 | fib_select_multipath(res, h); |
3ce58d84 DA |
1730 | } |
1731 | else | |
1732 | #endif | |
1733 | if (!res->prefixlen && | |
1734 | res->table->tb_num_default > 1 && | |
7a18c5b9 | 1735 | res->type == RTN_UNICAST && oif_check) |
3ce58d84 DA |
1736 | fib_select_default(fl4, res); |
1737 | ||
1738 | if (!fl4->saddr) | |
1739 | fl4->saddr = FIB_RES_PREFSRC(net, *res); | |
1740 | } | |
1741 | EXPORT_SYMBOL_GPL(fib_select_path); |