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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> |
04b1d4e5 | 47 | #include <net/fib_notifier.h> |
1da177e4 LT |
48 | |
49 | #include "fib_lookup.h" | |
50 | ||
832b4c5e | 51 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
52 | static struct hlist_head *fib_info_hash; |
53 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 54 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
55 | static unsigned int fib_info_cnt; |
56 | ||
57 | #define DEVINDEX_HASHBITS 8 | |
58 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
59 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
60 | ||
61 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1da177e4 | 62 | |
6a31d2a9 ED |
63 | #define for_nexthops(fi) { \ |
64 | int nhsel; const struct fib_nh *nh; \ | |
65 | for (nhsel = 0, nh = (fi)->fib_nh; \ | |
66 | nhsel < (fi)->fib_nhs; \ | |
67 | nh++, nhsel++) | |
68 | ||
69 | #define change_nexthops(fi) { \ | |
70 | int nhsel; struct fib_nh *nexthop_nh; \ | |
71 | for (nhsel = 0, nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
72 | nhsel < (fi)->fib_nhs; \ | |
73 | nexthop_nh++, nhsel++) | |
1da177e4 LT |
74 | |
75 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
76 | ||
77 | /* Hope, that gcc will optimize it to get rid of dummy loop */ | |
78 | ||
6a31d2a9 ED |
79 | #define for_nexthops(fi) { \ |
80 | int nhsel; const struct fib_nh *nh = (fi)->fib_nh; \ | |
81 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 | 82 | |
6a31d2a9 ED |
83 | #define change_nexthops(fi) { \ |
84 | int nhsel; \ | |
85 | struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
86 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 LT |
87 | |
88 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
89 | ||
90 | #define endfor_nexthops(fi) } | |
91 | ||
92 | ||
3be0686b | 93 | const struct fib_prop fib_props[RTN_MAX + 1] = { |
6a31d2a9 | 94 | [RTN_UNSPEC] = { |
1da177e4 LT |
95 | .error = 0, |
96 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
97 | }, |
98 | [RTN_UNICAST] = { | |
1da177e4 LT |
99 | .error = 0, |
100 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
101 | }, |
102 | [RTN_LOCAL] = { | |
1da177e4 LT |
103 | .error = 0, |
104 | .scope = RT_SCOPE_HOST, | |
6a31d2a9 ED |
105 | }, |
106 | [RTN_BROADCAST] = { | |
1da177e4 LT |
107 | .error = 0, |
108 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
109 | }, |
110 | [RTN_ANYCAST] = { | |
1da177e4 LT |
111 | .error = 0, |
112 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
113 | }, |
114 | [RTN_MULTICAST] = { | |
1da177e4 LT |
115 | .error = 0, |
116 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
117 | }, |
118 | [RTN_BLACKHOLE] = { | |
1da177e4 LT |
119 | .error = -EINVAL, |
120 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
121 | }, |
122 | [RTN_UNREACHABLE] = { | |
1da177e4 LT |
123 | .error = -EHOSTUNREACH, |
124 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
125 | }, |
126 | [RTN_PROHIBIT] = { | |
1da177e4 LT |
127 | .error = -EACCES, |
128 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
129 | }, |
130 | [RTN_THROW] = { | |
1da177e4 LT |
131 | .error = -EAGAIN, |
132 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
133 | }, |
134 | [RTN_NAT] = { | |
1da177e4 LT |
135 | .error = -EINVAL, |
136 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
137 | }, |
138 | [RTN_XRESOLVE] = { | |
1da177e4 LT |
139 | .error = -EINVAL, |
140 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 | 141 | }, |
1da177e4 LT |
142 | }; |
143 | ||
c5038a83 DM |
144 | static void rt_fibinfo_free(struct rtable __rcu **rtp) |
145 | { | |
146 | struct rtable *rt = rcu_dereference_protected(*rtp, 1); | |
147 | ||
148 | if (!rt) | |
149 | return; | |
150 | ||
151 | /* Not even needed : RCU_INIT_POINTER(*rtp, NULL); | |
152 | * because we waited an RCU grace period before calling | |
153 | * free_fib_info_rcu() | |
154 | */ | |
155 | ||
95c47f9c | 156 | dst_dev_put(&rt->dst); |
b838d5e1 | 157 | dst_release_immediate(&rt->dst); |
c5038a83 DM |
158 | } |
159 | ||
4895c771 DM |
160 | static void free_nh_exceptions(struct fib_nh *nh) |
161 | { | |
caa41527 | 162 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
163 | int i; |
164 | ||
caa41527 ED |
165 | hash = rcu_dereference_protected(nh->nh_exceptions, 1); |
166 | if (!hash) | |
167 | return; | |
4895c771 DM |
168 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
169 | struct fib_nh_exception *fnhe; | |
170 | ||
5abf7f7e | 171 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
4895c771 DM |
172 | while (fnhe) { |
173 | struct fib_nh_exception *next; | |
174 | ||
5abf7f7e | 175 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
c5038a83 | 176 | |
2ffae99d TT |
177 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
178 | rt_fibinfo_free(&fnhe->fnhe_rth_output); | |
c5038a83 | 179 | |
4895c771 DM |
180 | kfree(fnhe); |
181 | ||
182 | fnhe = next; | |
183 | } | |
184 | } | |
185 | kfree(hash); | |
186 | } | |
187 | ||
c5038a83 | 188 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
d26b3a7c ED |
189 | { |
190 | int cpu; | |
191 | ||
192 | if (!rtp) | |
193 | return; | |
194 | ||
195 | for_each_possible_cpu(cpu) { | |
196 | struct rtable *rt; | |
197 | ||
198 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); | |
0830106c | 199 | if (rt) { |
95c47f9c | 200 | dst_dev_put(&rt->dst); |
b838d5e1 | 201 | dst_release_immediate(&rt->dst); |
0830106c | 202 | } |
d26b3a7c ED |
203 | } |
204 | free_percpu(rtp); | |
205 | } | |
206 | ||
1da177e4 | 207 | /* Release a nexthop info record */ |
19c1ea14 YZ |
208 | static void free_fib_info_rcu(struct rcu_head *head) |
209 | { | |
210 | struct fib_info *fi = container_of(head, struct fib_info, rcu); | |
3fb07daf | 211 | struct dst_metrics *m; |
19c1ea14 | 212 | |
e49cc0da YZ |
213 | change_nexthops(fi) { |
214 | if (nexthop_nh->nh_dev) | |
215 | dev_put(nexthop_nh->nh_dev); | |
5a6228a0 | 216 | lwtstate_put(nexthop_nh->nh_lwtstate); |
caa41527 | 217 | free_nh_exceptions(nexthop_nh); |
c5038a83 DM |
218 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
219 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); | |
e49cc0da YZ |
220 | } endfor_nexthops(fi); |
221 | ||
3fb07daf | 222 | m = fi->fib_metrics; |
9620fef2 | 223 | if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt)) |
3fb07daf | 224 | kfree(m); |
19c1ea14 YZ |
225 | kfree(fi); |
226 | } | |
1da177e4 LT |
227 | |
228 | void free_fib_info(struct fib_info *fi) | |
229 | { | |
230 | if (fi->fib_dead == 0) { | |
058bd4d2 | 231 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
232 | return; |
233 | } | |
1da177e4 | 234 | fib_info_cnt--; |
7a9bc9b8 DM |
235 | #ifdef CONFIG_IP_ROUTE_CLASSID |
236 | change_nexthops(fi) { | |
237 | if (nexthop_nh->nh_tclassid) | |
f4530fa5 | 238 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
7a9bc9b8 DM |
239 | } endfor_nexthops(fi); |
240 | #endif | |
19c1ea14 | 241 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 | 242 | } |
b423cb10 | 243 | EXPORT_SYMBOL_GPL(free_fib_info); |
1da177e4 LT |
244 | |
245 | void fib_release_info(struct fib_info *fi) | |
246 | { | |
832b4c5e | 247 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
248 | if (fi && --fi->fib_treeref == 0) { |
249 | hlist_del(&fi->fib_hash); | |
250 | if (fi->fib_prefsrc) | |
251 | hlist_del(&fi->fib_lhash); | |
252 | change_nexthops(fi) { | |
71fceff0 | 253 | if (!nexthop_nh->nh_dev) |
1da177e4 | 254 | continue; |
71fceff0 | 255 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
256 | } endfor_nexthops(fi) |
257 | fi->fib_dead = 1; | |
258 | fib_info_put(fi); | |
259 | } | |
832b4c5e | 260 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
261 | } |
262 | ||
6a31d2a9 | 263 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
264 | { |
265 | const struct fib_nh *onh = ofi->fib_nh; | |
266 | ||
267 | for_nexthops(fi) { | |
268 | if (nh->nh_oif != onh->nh_oif || | |
269 | nh->nh_gw != onh->nh_gw || | |
270 | nh->nh_scope != onh->nh_scope || | |
271 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
272 | nh->nh_weight != onh->nh_weight || | |
273 | #endif | |
c7066f70 | 274 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
275 | nh->nh_tclassid != onh->nh_tclassid || |
276 | #endif | |
571e7226 | 277 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
8a3d0316 | 278 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
1da177e4 LT |
279 | return -1; |
280 | onh++; | |
281 | } endfor_nexthops(fi); | |
282 | return 0; | |
283 | } | |
284 | ||
88ebc72f DM |
285 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
286 | { | |
287 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
288 | ||
289 | return (val ^ | |
290 | (val >> DEVINDEX_HASHBITS) ^ | |
291 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
292 | } | |
293 | ||
1da177e4 LT |
294 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
295 | { | |
123b9731 | 296 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
297 | unsigned int val = fi->fib_nhs; |
298 | ||
37e826c5 | 299 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 300 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 301 | val ^= fi->fib_priority; |
88ebc72f DM |
302 | for_nexthops(fi) { |
303 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
304 | } endfor_nexthops(fi) | |
1da177e4 LT |
305 | |
306 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
307 | } | |
308 | ||
309 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
310 | { | |
311 | struct hlist_head *head; | |
1da177e4 LT |
312 | struct fib_info *fi; |
313 | unsigned int hash; | |
314 | ||
315 | hash = fib_info_hashfn(nfi); | |
316 | head = &fib_info_hash[hash]; | |
317 | ||
b67bfe0d | 318 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 319 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 320 | continue; |
1da177e4 LT |
321 | if (fi->fib_nhs != nfi->fib_nhs) |
322 | continue; | |
323 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 324 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
325 | nfi->fib_prefsrc == fi->fib_prefsrc && |
326 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 327 | nfi->fib_type == fi->fib_type && |
1da177e4 | 328 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 329 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 330 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
1da177e4 LT |
331 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
332 | return fi; | |
333 | } | |
334 | ||
335 | return NULL; | |
336 | } | |
337 | ||
1da177e4 | 338 | /* Check, that the gateway is already configured. |
6a31d2a9 | 339 | * Used only by redirect accept routine. |
1da177e4 | 340 | */ |
d878e72e | 341 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
342 | { |
343 | struct hlist_head *head; | |
1da177e4 LT |
344 | struct fib_nh *nh; |
345 | unsigned int hash; | |
346 | ||
832b4c5e | 347 | spin_lock(&fib_info_lock); |
1da177e4 LT |
348 | |
349 | hash = fib_devindex_hashfn(dev->ifindex); | |
350 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 351 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
352 | if (nh->nh_dev == dev && |
353 | nh->nh_gw == gw && | |
6a31d2a9 | 354 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 355 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
356 | return 0; |
357 | } | |
358 | } | |
359 | ||
832b4c5e | 360 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
361 | |
362 | return -1; | |
363 | } | |
364 | ||
339bf98f TG |
365 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
366 | { | |
367 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
368 | + nla_total_size(4) /* RTA_TABLE */ | |
369 | + nla_total_size(4) /* RTA_DST */ | |
370 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
371 | + nla_total_size(4) /* RTA_PREFSRC */ |
372 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
373 | |
374 | /* space for nested metrics */ | |
375 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
376 | ||
377 | if (fi->fib_nhs) { | |
571e7226 | 378 | size_t nh_encapsize = 0; |
339bf98f TG |
379 | /* Also handles the special case fib_nhs == 1 */ |
380 | ||
381 | /* each nexthop is packed in an attribute */ | |
382 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
383 | ||
384 | /* may contain flow and gateway attribute */ | |
385 | nhsize += 2 * nla_total_size(4); | |
386 | ||
571e7226 RP |
387 | /* grab encap info */ |
388 | for_nexthops(fi) { | |
389 | if (nh->nh_lwtstate) { | |
390 | /* RTA_ENCAP_TYPE */ | |
391 | nh_encapsize += lwtunnel_get_encap_size( | |
392 | nh->nh_lwtstate); | |
393 | /* RTA_ENCAP */ | |
394 | nh_encapsize += nla_total_size(2); | |
395 | } | |
396 | } endfor_nexthops(fi); | |
397 | ||
339bf98f | 398 | /* all nexthops are packed in a nested attribute */ |
571e7226 RP |
399 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
400 | nh_encapsize); | |
401 | ||
339bf98f TG |
402 | } |
403 | ||
404 | return payload; | |
405 | } | |
406 | ||
81f7bf6c | 407 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 408 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 409 | unsigned int nlm_flags) |
1da177e4 LT |
410 | { |
411 | struct sk_buff *skb; | |
4e902c57 | 412 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 413 | int err = -ENOBUFS; |
1da177e4 | 414 | |
339bf98f | 415 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 416 | if (!skb) |
f21c7bc5 | 417 | goto errout; |
1da177e4 | 418 | |
15e47304 | 419 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 420 | fa->fa_type, key, dst_len, |
b8f55831 | 421 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
422 | if (err < 0) { |
423 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
424 | WARN_ON(err == -EMSGSIZE); | |
425 | kfree_skb(skb); | |
426 | goto errout; | |
427 | } | |
15e47304 | 428 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
429 | info->nlh, GFP_KERNEL); |
430 | return; | |
f21c7bc5 TG |
431 | errout: |
432 | if (err < 0) | |
4d1169c1 | 433 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
434 | } |
435 | ||
c9cb6b6e SH |
436 | static int fib_detect_death(struct fib_info *fi, int order, |
437 | struct fib_info **last_resort, int *last_idx, | |
438 | int dflt) | |
1da177e4 LT |
439 | { |
440 | struct neighbour *n; | |
441 | int state = NUD_NONE; | |
442 | ||
443 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
444 | if (n) { | |
445 | state = n->nud_state; | |
446 | neigh_release(n); | |
88f64320 JA |
447 | } else { |
448 | return 0; | |
1da177e4 | 449 | } |
d9319100 | 450 | if (state == NUD_REACHABLE) |
1da177e4 | 451 | return 0; |
6a31d2a9 | 452 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 453 | return 0; |
6a31d2a9 | 454 | if ((state & NUD_VALID) || |
88f64320 | 455 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
1da177e4 LT |
456 | *last_resort = fi; |
457 | *last_idx = order; | |
458 | } | |
459 | return 1; | |
460 | } | |
461 | ||
462 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
463 | ||
6d8422a1 DA |
464 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining, |
465 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
466 | { |
467 | int nhs = 0; | |
1da177e4 | 468 | |
4e902c57 | 469 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 470 | nhs++; |
4e902c57 TG |
471 | rtnh = rtnh_next(rtnh, &remaining); |
472 | } | |
473 | ||
474 | /* leftover implies invalid nexthop configuration, discard it */ | |
c3ab2b4e DA |
475 | if (remaining > 0) { |
476 | NL_SET_ERR_MSG(extack, | |
477 | "Invalid nexthop configuration - extra data after nexthops"); | |
478 | nhs = 0; | |
479 | } | |
480 | ||
481 | return nhs; | |
1da177e4 LT |
482 | } |
483 | ||
4e902c57 | 484 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
6d8422a1 DA |
485 | int remaining, struct fib_config *cfg, |
486 | struct netlink_ext_ack *extack) | |
1da177e4 | 487 | { |
571e7226 RP |
488 | int ret; |
489 | ||
1da177e4 | 490 | change_nexthops(fi) { |
4e902c57 TG |
491 | int attrlen; |
492 | ||
c3ab2b4e DA |
493 | if (!rtnh_ok(rtnh, remaining)) { |
494 | NL_SET_ERR_MSG(extack, | |
495 | "Invalid nexthop configuration - extra data after nexthop"); | |
1da177e4 | 496 | return -EINVAL; |
c3ab2b4e | 497 | } |
4e902c57 | 498 | |
c3ab2b4e DA |
499 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
500 | NL_SET_ERR_MSG(extack, | |
501 | "Invalid flags for nexthop - can not contain DEAD or LINKDOWN"); | |
80610229 | 502 | return -EINVAL; |
c3ab2b4e | 503 | } |
80610229 | 504 | |
71fceff0 DM |
505 | nexthop_nh->nh_flags = |
506 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
507 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
508 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
509 | |
510 | attrlen = rtnh_attrlen(rtnh); | |
511 | if (attrlen > 0) { | |
512 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
513 | ||
514 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 515 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
c7066f70 | 516 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 517 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 518 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 519 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 520 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 521 | #endif |
571e7226 RP |
522 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
523 | if (nla) { | |
524 | struct lwtunnel_state *lwtstate; | |
571e7226 RP |
525 | struct nlattr *nla_entype; |
526 | ||
527 | nla_entype = nla_find(attrs, attrlen, | |
528 | RTA_ENCAP_TYPE); | |
c3ab2b4e DA |
529 | if (!nla_entype) { |
530 | NL_SET_BAD_ATTR(extack, nla); | |
531 | NL_SET_ERR_MSG(extack, | |
532 | "Encap type is missing"); | |
571e7226 | 533 | goto err_inval; |
c3ab2b4e | 534 | } |
30357d7d DA |
535 | |
536 | ret = lwtunnel_build_state(nla_get_u16( | |
571e7226 | 537 | nla_entype), |
127eb7cd | 538 | nla, AF_INET, cfg, |
9ae28727 | 539 | &lwtstate, extack); |
571e7226 RP |
540 | if (ret) |
541 | goto errout; | |
5a6228a0 ND |
542 | nexthop_nh->nh_lwtstate = |
543 | lwtstate_get(lwtstate); | |
571e7226 | 544 | } |
1da177e4 | 545 | } |
4e902c57 TG |
546 | |
547 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 548 | } endfor_nexthops(fi); |
4e902c57 | 549 | |
1da177e4 | 550 | return 0; |
571e7226 RP |
551 | |
552 | err_inval: | |
553 | ret = -EINVAL; | |
554 | ||
555 | errout: | |
556 | return ret; | |
1da177e4 LT |
557 | } |
558 | ||
0e884c78 PN |
559 | static void fib_rebalance(struct fib_info *fi) |
560 | { | |
561 | int total; | |
562 | int w; | |
563 | struct in_device *in_dev; | |
564 | ||
565 | if (fi->fib_nhs < 2) | |
566 | return; | |
567 | ||
568 | total = 0; | |
569 | for_nexthops(fi) { | |
570 | if (nh->nh_flags & RTNH_F_DEAD) | |
571 | continue; | |
572 | ||
51161aa9 | 573 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0e884c78 PN |
574 | |
575 | if (in_dev && | |
576 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
577 | nh->nh_flags & RTNH_F_LINKDOWN) | |
578 | continue; | |
579 | ||
580 | total += nh->nh_weight; | |
581 | } endfor_nexthops(fi); | |
582 | ||
583 | w = 0; | |
584 | change_nexthops(fi) { | |
585 | int upper_bound; | |
586 | ||
51161aa9 | 587 | in_dev = __in_dev_get_rtnl(nexthop_nh->nh_dev); |
0e884c78 PN |
588 | |
589 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) { | |
590 | upper_bound = -1; | |
591 | } else if (in_dev && | |
592 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
593 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) { | |
594 | upper_bound = -1; | |
595 | } else { | |
596 | w += nexthop_nh->nh_weight; | |
0a837fe4 PN |
597 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
598 | total) - 1; | |
0e884c78 PN |
599 | } |
600 | ||
601 | atomic_set(&nexthop_nh->nh_upper_bound, upper_bound); | |
602 | } endfor_nexthops(fi); | |
0e884c78 | 603 | } |
0e884c78 PN |
604 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
605 | ||
606 | #define fib_rebalance(fi) do { } while (0) | |
0e884c78 PN |
607 | |
608 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
1da177e4 | 609 | |
30357d7d | 610 | static int fib_encap_match(u16 encap_type, |
e01286ef | 611 | struct nlattr *encap, |
30357d7d | 612 | const struct fib_nh *nh, |
9ae28727 DA |
613 | const struct fib_config *cfg, |
614 | struct netlink_ext_ack *extack) | |
571e7226 RP |
615 | { |
616 | struct lwtunnel_state *lwtstate; | |
df383e62 | 617 | int ret, result = 0; |
571e7226 RP |
618 | |
619 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
620 | return 0; | |
621 | ||
9ae28727 DA |
622 | ret = lwtunnel_build_state(encap_type, encap, AF_INET, |
623 | cfg, &lwtstate, extack); | |
df383e62 JB |
624 | if (!ret) { |
625 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); | |
626 | lwtstate_free(lwtstate); | |
627 | } | |
571e7226 | 628 | |
df383e62 | 629 | return result; |
571e7226 RP |
630 | } |
631 | ||
9ae28727 DA |
632 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi, |
633 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
634 | { |
635 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
636 | struct rtnexthop *rtnh; |
637 | int remaining; | |
1da177e4 LT |
638 | #endif |
639 | ||
4e902c57 | 640 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
641 | return 1; |
642 | ||
4e902c57 | 643 | if (cfg->fc_oif || cfg->fc_gw) { |
571e7226 | 644 | if (cfg->fc_encap) { |
9ae28727 DA |
645 | if (fib_encap_match(cfg->fc_encap_type, cfg->fc_encap, |
646 | fi->fib_nh, cfg, extack)) | |
647 | return 1; | |
571e7226 | 648 | } |
4e902c57 TG |
649 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
650 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
651 | return 0; |
652 | return 1; | |
653 | } | |
654 | ||
655 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 656 | if (!cfg->fc_mp) |
1da177e4 | 657 | return 0; |
4e902c57 TG |
658 | |
659 | rtnh = cfg->fc_mp; | |
660 | remaining = cfg->fc_mp_len; | |
e905a9ed | 661 | |
1da177e4 | 662 | for_nexthops(fi) { |
4e902c57 | 663 | int attrlen; |
1da177e4 | 664 | |
4e902c57 | 665 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 666 | return -EINVAL; |
4e902c57 TG |
667 | |
668 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 669 | return 1; |
4e902c57 TG |
670 | |
671 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 672 | if (attrlen > 0) { |
4e902c57 TG |
673 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
674 | ||
675 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 676 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
1da177e4 | 677 | return 1; |
c7066f70 | 678 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
679 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
680 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
681 | return 1; |
682 | #endif | |
683 | } | |
4e902c57 TG |
684 | |
685 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
686 | } endfor_nexthops(fi); |
687 | #endif | |
688 | return 0; | |
689 | } | |
690 | ||
5f9ae3d9 XL |
691 | bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi) |
692 | { | |
693 | struct nlattr *nla; | |
694 | int remaining; | |
695 | ||
696 | if (!cfg->fc_mx) | |
697 | return true; | |
698 | ||
699 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
700 | int type = nla_type(nla); | |
701 | u32 val; | |
702 | ||
703 | if (!type) | |
704 | continue; | |
705 | if (type > RTAX_MAX) | |
706 | return false; | |
707 | ||
708 | if (type == RTAX_CC_ALGO) { | |
709 | char tmp[TCP_CA_NAME_MAX]; | |
710 | bool ecn_ca = false; | |
711 | ||
712 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
6670e152 | 713 | val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca); |
5f9ae3d9 XL |
714 | } else { |
715 | val = nla_get_u32(nla); | |
716 | } | |
717 | ||
718 | if (fi->fib_metrics->metrics[type - 1] != val) | |
719 | return false; | |
720 | } | |
721 | ||
722 | return true; | |
723 | } | |
724 | ||
1da177e4 LT |
725 | |
726 | /* | |
6a31d2a9 ED |
727 | * Picture |
728 | * ------- | |
729 | * | |
730 | * Semantics of nexthop is very messy by historical reasons. | |
731 | * We have to take into account, that: | |
732 | * a) gateway can be actually local interface address, | |
733 | * so that gatewayed route is direct. | |
734 | * b) gateway must be on-link address, possibly | |
735 | * described not by an ifaddr, but also by a direct route. | |
736 | * c) If both gateway and interface are specified, they should not | |
737 | * contradict. | |
738 | * d) If we use tunnel routes, gateway could be not on-link. | |
739 | * | |
740 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
741 | * results in pretty ugly and hairy code with obscure logic. | |
742 | * | |
743 | * I chose to generalized it instead, so that the size | |
744 | * of code does not increase practically, but it becomes | |
745 | * much more general. | |
746 | * Every prefix is assigned a "scope" value: "host" is local address, | |
747 | * "link" is direct route, | |
748 | * [ ... "site" ... "interior" ... ] | |
749 | * and "universe" is true gateway route with global meaning. | |
750 | * | |
751 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
752 | * where gw must have narrower scope. This recursion stops | |
753 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
754 | * which means that gw is forced to be on link. | |
755 | * | |
756 | * Code is still hairy, but now it is apparently logically | |
757 | * consistent and very flexible. F.e. as by-product it allows | |
758 | * to co-exists in peace independent exterior and interior | |
759 | * routing processes. | |
760 | * | |
761 | * Normally it looks as following. | |
762 | * | |
763 | * {universe prefix} -> (gw, oif) [scope link] | |
764 | * | | |
765 | * |-> {link prefix} -> (gw, oif) [scope local] | |
766 | * | | |
767 | * |-> {local prefix} (terminal node) | |
1da177e4 | 768 | */ |
fa8fefaa DA |
769 | static int fib_check_nh(struct fib_config *cfg, struct fib_nh *nh, |
770 | struct netlink_ext_ack *extack) | |
1da177e4 | 771 | { |
127eb7cd | 772 | int err = 0; |
86167a37 | 773 | struct net *net; |
6a31d2a9 | 774 | struct net_device *dev; |
1da177e4 | 775 | |
86167a37 | 776 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
777 | if (nh->nh_gw) { |
778 | struct fib_result res; | |
779 | ||
6a31d2a9 | 780 | if (nh->nh_flags & RTNH_F_ONLINK) { |
30bbaa19 | 781 | unsigned int addr_type; |
1da177e4 | 782 | |
c3ab2b4e DA |
783 | if (cfg->fc_scope >= RT_SCOPE_LINK) { |
784 | NL_SET_ERR_MSG(extack, | |
785 | "Nexthop has invalid scope"); | |
1da177e4 | 786 | return -EINVAL; |
c3ab2b4e | 787 | } |
6a31d2a9 ED |
788 | dev = __dev_get_by_index(net, nh->nh_oif); |
789 | if (!dev) | |
1da177e4 | 790 | return -ENODEV; |
c3ab2b4e DA |
791 | if (!(dev->flags & IFF_UP)) { |
792 | NL_SET_ERR_MSG(extack, | |
793 | "Nexthop device is not up"); | |
1da177e4 | 794 | return -ENETDOWN; |
c3ab2b4e | 795 | } |
30bbaa19 | 796 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
c3ab2b4e DA |
797 | if (addr_type != RTN_UNICAST) { |
798 | NL_SET_ERR_MSG(extack, | |
799 | "Nexthop has invalid gateway"); | |
30bbaa19 | 800 | return -EINVAL; |
c3ab2b4e | 801 | } |
8a3d0316 AG |
802 | if (!netif_carrier_ok(dev)) |
803 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
804 | nh->nh_dev = dev; |
805 | dev_hold(dev); | |
806 | nh->nh_scope = RT_SCOPE_LINK; | |
807 | return 0; | |
808 | } | |
ebc0ffae | 809 | rcu_read_lock(); |
1da177e4 | 810 | { |
3bfd8472 | 811 | struct fib_table *tbl = NULL; |
9ade2286 DM |
812 | struct flowi4 fl4 = { |
813 | .daddr = nh->nh_gw, | |
814 | .flowi4_scope = cfg->fc_scope + 1, | |
815 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 816 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 817 | }; |
1da177e4 LT |
818 | |
819 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
820 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
821 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
3bfd8472 DA |
822 | |
823 | if (cfg->fc_table) | |
824 | tbl = fib_get_table(net, cfg->fc_table); | |
825 | ||
826 | if (tbl) | |
827 | err = fib_table_lookup(tbl, &fl4, &res, | |
1e313678 ED |
828 | FIB_LOOKUP_IGNORE_LINKSTATE | |
829 | FIB_LOOKUP_NOREF); | |
4c9bcd11 DA |
830 | |
831 | /* on error or if no table given do full lookup. This | |
832 | * is needed for example when nexthops are in the local | |
833 | * table rather than the given table | |
834 | */ | |
835 | if (!tbl || err) { | |
3bfd8472 DA |
836 | err = fib_lookup(net, &fl4, &res, |
837 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
4c9bcd11 DA |
838 | } |
839 | ||
ebc0ffae | 840 | if (err) { |
c3ab2b4e DA |
841 | NL_SET_ERR_MSG(extack, |
842 | "Nexthop has invalid gateway"); | |
ebc0ffae | 843 | rcu_read_unlock(); |
1da177e4 | 844 | return err; |
ebc0ffae | 845 | } |
1da177e4 LT |
846 | } |
847 | err = -EINVAL; | |
c3ab2b4e DA |
848 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) { |
849 | NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway"); | |
1da177e4 | 850 | goto out; |
c3ab2b4e | 851 | } |
1da177e4 LT |
852 | nh->nh_scope = res.scope; |
853 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 | 854 | nh->nh_dev = dev = FIB_RES_DEV(res); |
c3ab2b4e DA |
855 | if (!dev) { |
856 | NL_SET_ERR_MSG(extack, | |
857 | "No egress device for nexthop gateway"); | |
1da177e4 | 858 | goto out; |
c3ab2b4e | 859 | } |
6a31d2a9 | 860 | dev_hold(dev); |
8a3d0316 AG |
861 | if (!netif_carrier_ok(dev)) |
862 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 863 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
864 | } else { |
865 | struct in_device *in_dev; | |
866 | ||
c3ab2b4e DA |
867 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) { |
868 | NL_SET_ERR_MSG(extack, | |
869 | "Invalid flags for nexthop - PERVASIVE and ONLINK can not be set"); | |
1da177e4 | 870 | return -EINVAL; |
c3ab2b4e | 871 | } |
8723e1b4 ED |
872 | rcu_read_lock(); |
873 | err = -ENODEV; | |
86167a37 | 874 | in_dev = inetdev_by_index(net, nh->nh_oif); |
51456b29 | 875 | if (!in_dev) |
8723e1b4 ED |
876 | goto out; |
877 | err = -ENETDOWN; | |
c3ab2b4e DA |
878 | if (!(in_dev->dev->flags & IFF_UP)) { |
879 | NL_SET_ERR_MSG(extack, "Device for nexthop is not up"); | |
8723e1b4 | 880 | goto out; |
c3ab2b4e | 881 | } |
1da177e4 LT |
882 | nh->nh_dev = in_dev->dev; |
883 | dev_hold(nh->nh_dev); | |
884 | nh->nh_scope = RT_SCOPE_HOST; | |
8a3d0316 AG |
885 | if (!netif_carrier_ok(nh->nh_dev)) |
886 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 887 | err = 0; |
1da177e4 | 888 | } |
8723e1b4 ED |
889 | out: |
890 | rcu_read_unlock(); | |
891 | return err; | |
1da177e4 LT |
892 | } |
893 | ||
81f7bf6c | 894 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 895 | { |
123b9731 | 896 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 897 | |
6a31d2a9 ED |
898 | return ((__force u32)val ^ |
899 | ((__force u32)val >> 7) ^ | |
900 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
901 | } |
902 | ||
123b9731 | 903 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
904 | { |
905 | if (bytes <= PAGE_SIZE) | |
88f83491 | 906 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
907 | else |
908 | return (struct hlist_head *) | |
6a31d2a9 ED |
909 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
910 | get_order(bytes)); | |
1da177e4 LT |
911 | } |
912 | ||
123b9731 | 913 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
914 | { |
915 | if (!hash) | |
916 | return; | |
917 | ||
918 | if (bytes <= PAGE_SIZE) | |
919 | kfree(hash); | |
920 | else | |
921 | free_pages((unsigned long) hash, get_order(bytes)); | |
922 | } | |
923 | ||
123b9731 DM |
924 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
925 | struct hlist_head *new_laddrhash, | |
926 | unsigned int new_size) | |
1da177e4 | 927 | { |
b7656e7f | 928 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 929 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 930 | unsigned int i, bytes; |
1da177e4 | 931 | |
832b4c5e | 932 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
933 | old_info_hash = fib_info_hash; |
934 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 935 | fib_info_hash_size = new_size; |
1da177e4 LT |
936 | |
937 | for (i = 0; i < old_size; i++) { | |
938 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 939 | struct hlist_node *n; |
1da177e4 LT |
940 | struct fib_info *fi; |
941 | ||
b67bfe0d | 942 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
943 | struct hlist_head *dest; |
944 | unsigned int new_hash; | |
945 | ||
1da177e4 LT |
946 | new_hash = fib_info_hashfn(fi); |
947 | dest = &new_info_hash[new_hash]; | |
948 | hlist_add_head(&fi->fib_hash, dest); | |
949 | } | |
950 | } | |
951 | fib_info_hash = new_info_hash; | |
952 | ||
953 | for (i = 0; i < old_size; i++) { | |
954 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 955 | struct hlist_node *n; |
1da177e4 LT |
956 | struct fib_info *fi; |
957 | ||
b67bfe0d | 958 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
959 | struct hlist_head *ldest; |
960 | unsigned int new_hash; | |
961 | ||
1da177e4 LT |
962 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
963 | ldest = &new_laddrhash[new_hash]; | |
964 | hlist_add_head(&fi->fib_lhash, ldest); | |
965 | } | |
966 | } | |
967 | fib_info_laddrhash = new_laddrhash; | |
968 | ||
832b4c5e | 969 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
970 | |
971 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
972 | fib_info_hash_free(old_info_hash, bytes); |
973 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
974 | } |
975 | ||
436c3b66 DM |
976 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
977 | { | |
978 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
979 | nh->nh_gw, | |
37e826c5 | 980 | nh->nh_parent->fib_scope); |
436c3b66 DM |
981 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
982 | ||
983 | return nh->nh_saddr; | |
984 | } | |
985 | ||
021dd3b8 DA |
986 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
987 | { | |
988 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
989 | fib_prefsrc != cfg->fc_dst) { | |
9b8ff518 | 990 | u32 tb_id = cfg->fc_table; |
e1b8d903 | 991 | int rc; |
021dd3b8 DA |
992 | |
993 | if (tb_id == RT_TABLE_MAIN) | |
994 | tb_id = RT_TABLE_LOCAL; | |
995 | ||
e1b8d903 DA |
996 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
997 | fib_prefsrc, tb_id); | |
998 | ||
999 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { | |
1000 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
1001 | fib_prefsrc, RT_TABLE_LOCAL); | |
021dd3b8 | 1002 | } |
e1b8d903 DA |
1003 | |
1004 | if (rc != RTN_LOCAL) | |
1005 | return false; | |
021dd3b8 DA |
1006 | } |
1007 | return true; | |
1008 | } | |
1009 | ||
6cf9dfd3 FW |
1010 | static int |
1011 | fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) | |
1012 | { | |
c3a8d947 | 1013 | bool ecn_ca = false; |
6cf9dfd3 FW |
1014 | struct nlattr *nla; |
1015 | int remaining; | |
1016 | ||
1017 | if (!cfg->fc_mx) | |
1018 | return 0; | |
1019 | ||
1020 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1021 | int type = nla_type(nla); | |
1022 | u32 val; | |
1023 | ||
1024 | if (!type) | |
1025 | continue; | |
1026 | if (type > RTAX_MAX) | |
1027 | return -EINVAL; | |
1028 | ||
1029 | if (type == RTAX_CC_ALGO) { | |
1030 | char tmp[TCP_CA_NAME_MAX]; | |
1031 | ||
1032 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
6670e152 | 1033 | val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca); |
6cf9dfd3 FW |
1034 | if (val == TCP_CA_UNSPEC) |
1035 | return -EINVAL; | |
1036 | } else { | |
1037 | val = nla_get_u32(nla); | |
1038 | } | |
1039 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
1040 | val = 65535 - 40; | |
1041 | if (type == RTAX_MTU && val > 65535 - 15) | |
1042 | val = 65535 - 15; | |
626abd59 PA |
1043 | if (type == RTAX_HOPLIMIT && val > 255) |
1044 | val = 255; | |
b8d3e416 DB |
1045 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1046 | return -EINVAL; | |
3fb07daf | 1047 | fi->fib_metrics->metrics[type - 1] = val; |
6cf9dfd3 FW |
1048 | } |
1049 | ||
c3a8d947 | 1050 | if (ecn_ca) |
3fb07daf | 1051 | fi->fib_metrics->metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; |
c3a8d947 | 1052 | |
6cf9dfd3 FW |
1053 | return 0; |
1054 | } | |
1055 | ||
6d8422a1 DA |
1056 | struct fib_info *fib_create_info(struct fib_config *cfg, |
1057 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1058 | { |
1059 | int err; | |
1060 | struct fib_info *fi = NULL; | |
1061 | struct fib_info *ofi; | |
1da177e4 | 1062 | int nhs = 1; |
7462bd74 | 1063 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 1064 | |
4c8237cd DM |
1065 | if (cfg->fc_type > RTN_MAX) |
1066 | goto err_inval; | |
1067 | ||
1da177e4 | 1068 | /* Fast check to catch the most weird cases */ |
c3ab2b4e DA |
1069 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) { |
1070 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1071 | goto err_inval; |
c3ab2b4e | 1072 | } |
1da177e4 | 1073 | |
c3ab2b4e DA |
1074 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
1075 | NL_SET_ERR_MSG(extack, | |
1076 | "Invalid rtm_flags - can not contain DEAD or LINKDOWN"); | |
80610229 | 1077 | goto err_inval; |
c3ab2b4e | 1078 | } |
80610229 | 1079 | |
1da177e4 | 1080 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 | 1081 | if (cfg->fc_mp) { |
6d8422a1 | 1082 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len, extack); |
1da177e4 LT |
1083 | if (nhs == 0) |
1084 | goto err_inval; | |
1085 | } | |
1086 | #endif | |
1da177e4 LT |
1087 | |
1088 | err = -ENOBUFS; | |
123b9731 DM |
1089 | if (fib_info_cnt >= fib_info_hash_size) { |
1090 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
1091 | struct hlist_head *new_info_hash; |
1092 | struct hlist_head *new_laddrhash; | |
1093 | unsigned int bytes; | |
1094 | ||
1095 | if (!new_size) | |
d94ce9b2 | 1096 | new_size = 16; |
1da177e4 | 1097 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
1098 | new_info_hash = fib_info_hash_alloc(bytes); |
1099 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 1100 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
1101 | fib_info_hash_free(new_info_hash, bytes); |
1102 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 1103 | } else |
123b9731 | 1104 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 1105 | |
123b9731 | 1106 | if (!fib_info_hash_size) |
1da177e4 LT |
1107 | goto failure; |
1108 | } | |
1109 | ||
0da974f4 | 1110 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
51456b29 | 1111 | if (!fi) |
1da177e4 | 1112 | goto failure; |
725d1e1b | 1113 | if (cfg->fc_mx) { |
3fb07daf | 1114 | fi->fib_metrics = kzalloc(sizeof(*fi->fib_metrics), GFP_KERNEL); |
187e5b3a ED |
1115 | if (unlikely(!fi->fib_metrics)) { |
1116 | kfree(fi); | |
1117 | return ERR_PTR(err); | |
1118 | } | |
9620fef2 | 1119 | refcount_set(&fi->fib_metrics->refcnt, 1); |
187e5b3a | 1120 | } else { |
3fb07daf | 1121 | fi->fib_metrics = (struct dst_metrics *)&dst_default_metrics; |
187e5b3a ED |
1122 | } |
1123 | fib_info_cnt++; | |
efd7ef1c | 1124 | fi->fib_net = net; |
4e902c57 | 1125 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 1126 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
1127 | fi->fib_flags = cfg->fc_flags; |
1128 | fi->fib_priority = cfg->fc_priority; | |
1129 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 1130 | fi->fib_type = cfg->fc_type; |
5a56a0b3 | 1131 | fi->fib_tb_id = cfg->fc_table; |
1da177e4 LT |
1132 | |
1133 | fi->fib_nhs = nhs; | |
1134 | change_nexthops(fi) { | |
71fceff0 | 1135 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 1136 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
1137 | if (!nexthop_nh->nh_pcpu_rth_output) |
1138 | goto failure; | |
1da177e4 LT |
1139 | } endfor_nexthops(fi) |
1140 | ||
6cf9dfd3 FW |
1141 | err = fib_convert_metrics(fi, cfg); |
1142 | if (err) | |
1143 | goto failure; | |
1da177e4 | 1144 | |
4e902c57 | 1145 | if (cfg->fc_mp) { |
1da177e4 | 1146 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6d8422a1 | 1147 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg, extack); |
4e902c57 | 1148 | if (err != 0) |
1da177e4 | 1149 | goto failure; |
c3ab2b4e DA |
1150 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) { |
1151 | NL_SET_ERR_MSG(extack, | |
1152 | "Nexthop device index does not match RTA_OIF"); | |
1da177e4 | 1153 | goto err_inval; |
c3ab2b4e DA |
1154 | } |
1155 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) { | |
1156 | NL_SET_ERR_MSG(extack, | |
1157 | "Nexthop gateway does not match RTA_GATEWAY"); | |
1da177e4 | 1158 | goto err_inval; |
c3ab2b4e | 1159 | } |
c7066f70 | 1160 | #ifdef CONFIG_IP_ROUTE_CLASSID |
c3ab2b4e DA |
1161 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) { |
1162 | NL_SET_ERR_MSG(extack, | |
1163 | "Nexthop class id does not match RTA_FLOW"); | |
1da177e4 | 1164 | goto err_inval; |
c3ab2b4e | 1165 | } |
1da177e4 LT |
1166 | #endif |
1167 | #else | |
c3ab2b4e DA |
1168 | NL_SET_ERR_MSG(extack, |
1169 | "Multipath support not enabled in kernel"); | |
1da177e4 LT |
1170 | goto err_inval; |
1171 | #endif | |
1172 | } else { | |
1173 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 | 1174 | |
571e7226 RP |
1175 | if (cfg->fc_encap) { |
1176 | struct lwtunnel_state *lwtstate; | |
571e7226 | 1177 | |
c3ab2b4e DA |
1178 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) { |
1179 | NL_SET_ERR_MSG(extack, | |
1180 | "LWT encap type not specified"); | |
571e7226 | 1181 | goto err_inval; |
c3ab2b4e | 1182 | } |
30357d7d | 1183 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd | 1184 | cfg->fc_encap, AF_INET, cfg, |
9ae28727 | 1185 | &lwtstate, extack); |
571e7226 RP |
1186 | if (err) |
1187 | goto failure; | |
1188 | ||
5a6228a0 | 1189 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
571e7226 | 1190 | } |
4e902c57 TG |
1191 | nh->nh_oif = cfg->fc_oif; |
1192 | nh->nh_gw = cfg->fc_gw; | |
1193 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 1194 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1195 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 1196 | if (nh->nh_tclassid) |
f4530fa5 | 1197 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 1198 | #endif |
1da177e4 LT |
1199 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1200 | nh->nh_weight = 1; | |
1201 | #endif | |
1202 | } | |
1203 | ||
4e902c57 | 1204 | if (fib_props[cfg->fc_type].error) { |
c3ab2b4e DA |
1205 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) { |
1206 | NL_SET_ERR_MSG(extack, | |
1207 | "Gateway, device and multipath can not be specified for this route type"); | |
1da177e4 | 1208 | goto err_inval; |
c3ab2b4e | 1209 | } |
1da177e4 | 1210 | goto link_it; |
4c8237cd DM |
1211 | } else { |
1212 | switch (cfg->fc_type) { | |
1213 | case RTN_UNICAST: | |
1214 | case RTN_LOCAL: | |
1215 | case RTN_BROADCAST: | |
1216 | case RTN_ANYCAST: | |
1217 | case RTN_MULTICAST: | |
1218 | break; | |
1219 | default: | |
c3ab2b4e | 1220 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
4c8237cd DM |
1221 | goto err_inval; |
1222 | } | |
1da177e4 LT |
1223 | } |
1224 | ||
c3ab2b4e DA |
1225 | if (cfg->fc_scope > RT_SCOPE_HOST) { |
1226 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1227 | goto err_inval; |
c3ab2b4e | 1228 | } |
1da177e4 | 1229 | |
4e902c57 | 1230 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
1231 | struct fib_nh *nh = fi->fib_nh; |
1232 | ||
1233 | /* Local address is added. */ | |
c3ab2b4e DA |
1234 | if (nhs != 1) { |
1235 | NL_SET_ERR_MSG(extack, | |
1236 | "Route with host scope can not have multiple nexthops"); | |
6d8422a1 | 1237 | goto err_inval; |
c3ab2b4e DA |
1238 | } |
1239 | if (nh->nh_gw) { | |
1240 | NL_SET_ERR_MSG(extack, | |
1241 | "Route with host scope can not have a gateway"); | |
1da177e4 | 1242 | goto err_inval; |
c3ab2b4e | 1243 | } |
1da177e4 | 1244 | nh->nh_scope = RT_SCOPE_NOWHERE; |
7462bd74 | 1245 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 | 1246 | err = -ENODEV; |
51456b29 | 1247 | if (!nh->nh_dev) |
1da177e4 LT |
1248 | goto failure; |
1249 | } else { | |
8a3d0316 AG |
1250 | int linkdown = 0; |
1251 | ||
1da177e4 | 1252 | change_nexthops(fi) { |
fa8fefaa | 1253 | err = fib_check_nh(cfg, nexthop_nh, extack); |
6a31d2a9 | 1254 | if (err != 0) |
1da177e4 | 1255 | goto failure; |
8a3d0316 AG |
1256 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
1257 | linkdown++; | |
1da177e4 | 1258 | } endfor_nexthops(fi) |
8a3d0316 AG |
1259 | if (linkdown == fi->fib_nhs) |
1260 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1261 | } |
1262 | ||
c3ab2b4e DA |
1263 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) { |
1264 | NL_SET_ERR_MSG(extack, "Invalid prefsrc address"); | |
021dd3b8 | 1265 | goto err_inval; |
c3ab2b4e | 1266 | } |
1da177e4 | 1267 | |
1fc050a1 | 1268 | change_nexthops(fi) { |
436c3b66 | 1269 | fib_info_update_nh_saddr(net, nexthop_nh); |
1fc050a1 DM |
1270 | } endfor_nexthops(fi) |
1271 | ||
0e884c78 PN |
1272 | fib_rebalance(fi); |
1273 | ||
1da177e4 | 1274 | link_it: |
6a31d2a9 ED |
1275 | ofi = fib_find_info(fi); |
1276 | if (ofi) { | |
1da177e4 LT |
1277 | fi->fib_dead = 1; |
1278 | free_fib_info(fi); | |
1279 | ofi->fib_treeref++; | |
1280 | return ofi; | |
1281 | } | |
1282 | ||
1283 | fi->fib_treeref++; | |
0029c0de | 1284 | refcount_set(&fi->fib_clntref, 1); |
832b4c5e | 1285 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1286 | hlist_add_head(&fi->fib_hash, |
1287 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1288 | if (fi->fib_prefsrc) { | |
1289 | struct hlist_head *head; | |
1290 | ||
1291 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1292 | hlist_add_head(&fi->fib_lhash, head); | |
1293 | } | |
1294 | change_nexthops(fi) { | |
1295 | struct hlist_head *head; | |
1296 | unsigned int hash; | |
1297 | ||
71fceff0 | 1298 | if (!nexthop_nh->nh_dev) |
1da177e4 | 1299 | continue; |
71fceff0 | 1300 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 1301 | head = &fib_info_devhash[hash]; |
71fceff0 | 1302 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 1303 | } endfor_nexthops(fi) |
832b4c5e | 1304 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1305 | return fi; |
1306 | ||
1307 | err_inval: | |
1308 | err = -EINVAL; | |
1309 | ||
1310 | failure: | |
e905a9ed | 1311 | if (fi) { |
1da177e4 LT |
1312 | fi->fib_dead = 1; |
1313 | free_fib_info(fi); | |
1314 | } | |
4e902c57 TG |
1315 | |
1316 | return ERR_PTR(err); | |
1da177e4 LT |
1317 | } |
1318 | ||
15e47304 | 1319 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1320 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1321 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1322 | { |
be403ea1 | 1323 | struct nlmsghdr *nlh; |
1da177e4 | 1324 | struct rtmsg *rtm; |
1da177e4 | 1325 | |
15e47304 | 1326 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1327 | if (!nlh) |
26932566 | 1328 | return -EMSGSIZE; |
be403ea1 TG |
1329 | |
1330 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1331 | rtm->rtm_family = AF_INET; |
1332 | rtm->rtm_dst_len = dst_len; | |
1333 | rtm->rtm_src_len = 0; | |
1334 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1335 | if (tb_id < 256) |
1336 | rtm->rtm_table = tb_id; | |
1337 | else | |
1338 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1339 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1340 | goto nla_put_failure; | |
1da177e4 LT |
1341 | rtm->rtm_type = type; |
1342 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1343 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1344 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1345 | |
f3756b79 | 1346 | if (rtm->rtm_dst_len && |
930345ea | 1347 | nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 DM |
1348 | goto nla_put_failure; |
1349 | if (fi->fib_priority && | |
1350 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1351 | goto nla_put_failure; | |
3fb07daf | 1352 | if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0) |
be403ea1 TG |
1353 | goto nla_put_failure; |
1354 | ||
f3756b79 | 1355 | if (fi->fib_prefsrc && |
930345ea | 1356 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1357 | goto nla_put_failure; |
1da177e4 | 1358 | if (fi->fib_nhs == 1) { |
f3756b79 | 1359 | if (fi->fib_nh->nh_gw && |
930345ea | 1360 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
f3756b79 DM |
1361 | goto nla_put_failure; |
1362 | if (fi->fib_nh->nh_oif && | |
1363 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1364 | goto nla_put_failure; | |
0eeb075f | 1365 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
25dd169a FW |
1366 | struct in_device *in_dev; |
1367 | ||
1368 | rcu_read_lock(); | |
1369 | in_dev = __in_dev_get_rcu(fi->fib_nh->nh_dev); | |
0eeb075f AG |
1370 | if (in_dev && |
1371 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1372 | rtm->rtm_flags |= RTNH_F_DEAD; | |
25dd169a | 1373 | rcu_read_unlock(); |
0eeb075f | 1374 | } |
475abbf1 IS |
1375 | if (fi->fib_nh->nh_flags & RTNH_F_OFFLOAD) |
1376 | rtm->rtm_flags |= RTNH_F_OFFLOAD; | |
c7066f70 | 1377 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1378 | if (fi->fib_nh[0].nh_tclassid && |
1379 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1380 | goto nla_put_failure; | |
8265abc0 | 1381 | #endif |
ea7a8085 DA |
1382 | if (fi->fib_nh->nh_lwtstate && |
1383 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate) < 0) | |
1384 | goto nla_put_failure; | |
1da177e4 LT |
1385 | } |
1386 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1387 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1388 | struct rtnexthop *rtnh; |
1389 | struct nlattr *mp; | |
1390 | ||
1391 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
51456b29 | 1392 | if (!mp) |
be403ea1 | 1393 | goto nla_put_failure; |
1da177e4 LT |
1394 | |
1395 | for_nexthops(fi) { | |
be403ea1 | 1396 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
51456b29 | 1397 | if (!rtnh) |
be403ea1 TG |
1398 | goto nla_put_failure; |
1399 | ||
1400 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
0eeb075f | 1401 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
25dd169a FW |
1402 | struct in_device *in_dev; |
1403 | ||
1404 | rcu_read_lock(); | |
1405 | in_dev = __in_dev_get_rcu(nh->nh_dev); | |
0eeb075f AG |
1406 | if (in_dev && |
1407 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1408 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
25dd169a | 1409 | rcu_read_unlock(); |
0eeb075f | 1410 | } |
be403ea1 TG |
1411 | rtnh->rtnh_hops = nh->nh_weight - 1; |
1412 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1413 | ||
f3756b79 | 1414 | if (nh->nh_gw && |
930345ea | 1415 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
f3756b79 | 1416 | goto nla_put_failure; |
c7066f70 | 1417 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1418 | if (nh->nh_tclassid && |
1419 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1420 | goto nla_put_failure; | |
8265abc0 | 1421 | #endif |
ea7a8085 DA |
1422 | if (nh->nh_lwtstate && |
1423 | lwtunnel_fill_encap(skb, nh->nh_lwtstate) < 0) | |
1424 | goto nla_put_failure; | |
1425 | ||
be403ea1 TG |
1426 | /* length of rtnetlink header + attributes */ |
1427 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1428 | } endfor_nexthops(fi); |
be403ea1 TG |
1429 | |
1430 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1431 | } |
1432 | #endif | |
053c095a JB |
1433 | nlmsg_end(skb, nlh); |
1434 | return 0; | |
1da177e4 | 1435 | |
be403ea1 | 1436 | nla_put_failure: |
26932566 PM |
1437 | nlmsg_cancel(skb, nlh); |
1438 | return -EMSGSIZE; | |
1da177e4 LT |
1439 | } |
1440 | ||
1da177e4 | 1441 | /* |
6a31d2a9 ED |
1442 | * Update FIB if: |
1443 | * - local address disappeared -> we must delete all the entries | |
1444 | * referring to it. | |
1445 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1446 | */ |
5a56a0b3 | 1447 | int fib_sync_down_addr(struct net_device *dev, __be32 local) |
1da177e4 LT |
1448 | { |
1449 | int ret = 0; | |
85326fa5 DL |
1450 | unsigned int hash = fib_laddr_hashfn(local); |
1451 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
5a56a0b3 MT |
1452 | struct net *net = dev_net(dev); |
1453 | int tb_id = l3mdev_fib_table(dev); | |
85326fa5 | 1454 | struct fib_info *fi; |
1da177e4 | 1455 | |
51456b29 | 1456 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1457 | return 0; |
1da177e4 | 1458 | |
b67bfe0d | 1459 | hlist_for_each_entry(fi, head, fib_lhash) { |
5a56a0b3 MT |
1460 | if (!net_eq(fi->fib_net, net) || |
1461 | fi->fib_tb_id != tb_id) | |
4814bdbd | 1462 | continue; |
85326fa5 DL |
1463 | if (fi->fib_prefsrc == local) { |
1464 | fi->fib_flags |= RTNH_F_DEAD; | |
1465 | ret++; | |
1da177e4 LT |
1466 | } |
1467 | } | |
85326fa5 DL |
1468 | return ret; |
1469 | } | |
1470 | ||
982acb97 IS |
1471 | static int call_fib_nh_notifiers(struct fib_nh *fib_nh, |
1472 | enum fib_event_type event_type) | |
1473 | { | |
1474 | struct in_device *in_dev = __in_dev_get_rtnl(fib_nh->nh_dev); | |
1475 | struct fib_nh_notifier_info info = { | |
1476 | .fib_nh = fib_nh, | |
1477 | }; | |
1478 | ||
1479 | switch (event_type) { | |
1480 | case FIB_EVENT_NH_ADD: | |
1481 | if (fib_nh->nh_flags & RTNH_F_DEAD) | |
1482 | break; | |
1483 | if (IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1484 | fib_nh->nh_flags & RTNH_F_LINKDOWN) | |
1485 | break; | |
04b1d4e5 IS |
1486 | return call_fib4_notifiers(dev_net(fib_nh->nh_dev), event_type, |
1487 | &info.info); | |
982acb97 | 1488 | case FIB_EVENT_NH_DEL: |
71ed7ee3 | 1489 | if ((in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && |
982acb97 IS |
1490 | fib_nh->nh_flags & RTNH_F_LINKDOWN) || |
1491 | (fib_nh->nh_flags & RTNH_F_DEAD)) | |
04b1d4e5 IS |
1492 | return call_fib4_notifiers(dev_net(fib_nh->nh_dev), |
1493 | event_type, &info.info); | |
982acb97 IS |
1494 | default: |
1495 | break; | |
1496 | } | |
1497 | ||
1498 | return NOTIFY_DONE; | |
1499 | } | |
1500 | ||
4f823def JA |
1501 | /* Event force Flags Description |
1502 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host | |
1503 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host | |
1504 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed | |
1505 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed | |
1506 | */ | |
1507 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) | |
85326fa5 DL |
1508 | { |
1509 | int ret = 0; | |
1510 | int scope = RT_SCOPE_NOWHERE; | |
1511 | struct fib_info *prev_fi = NULL; | |
1512 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1513 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1514 | struct fib_nh *nh; |
1da177e4 | 1515 | |
4f823def | 1516 | if (force) |
85326fa5 | 1517 | scope = -1; |
1da177e4 | 1518 | |
b67bfe0d | 1519 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1520 | struct fib_info *fi = nh->nh_parent; |
1521 | int dead; | |
1da177e4 | 1522 | |
85326fa5 DL |
1523 | BUG_ON(!fi->fib_nhs); |
1524 | if (nh->nh_dev != dev || fi == prev_fi) | |
1525 | continue; | |
1526 | prev_fi = fi; | |
1527 | dead = 0; | |
1528 | change_nexthops(fi) { | |
6a31d2a9 | 1529 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1530 | dead++; |
71fceff0 DM |
1531 | else if (nexthop_nh->nh_dev == dev && |
1532 | nexthop_nh->nh_scope != scope) { | |
8a3d0316 AG |
1533 | switch (event) { |
1534 | case NETDEV_DOWN: | |
1535 | case NETDEV_UNREGISTER: | |
1536 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1537 | /* fall through */ | |
1538 | case NETDEV_CHANGE: | |
1539 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; | |
1540 | break; | |
1541 | } | |
982acb97 IS |
1542 | call_fib_nh_notifiers(nexthop_nh, |
1543 | FIB_EVENT_NH_DEL); | |
85326fa5 DL |
1544 | dead++; |
1545 | } | |
1da177e4 | 1546 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 AG |
1547 | if (event == NETDEV_UNREGISTER && |
1548 | nexthop_nh->nh_dev == dev) { | |
85326fa5 DL |
1549 | dead = fi->fib_nhs; |
1550 | break; | |
1da177e4 | 1551 | } |
85326fa5 DL |
1552 | #endif |
1553 | } endfor_nexthops(fi) | |
1554 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1555 | switch (event) { |
1556 | case NETDEV_DOWN: | |
1557 | case NETDEV_UNREGISTER: | |
1558 | fi->fib_flags |= RTNH_F_DEAD; | |
1559 | /* fall through */ | |
1560 | case NETDEV_CHANGE: | |
1561 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1562 | break; | |
1563 | } | |
85326fa5 | 1564 | ret++; |
1da177e4 | 1565 | } |
0e884c78 PN |
1566 | |
1567 | fib_rebalance(fi); | |
1da177e4 LT |
1568 | } |
1569 | ||
1570 | return ret; | |
1571 | } | |
1572 | ||
0c838ff1 | 1573 | /* Must be invoked inside of an RCU protected region. */ |
c7b371e3 | 1574 | static void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
1575 | { |
1576 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 1577 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 1578 | struct fib_table *tb = res->table; |
18a912e9 | 1579 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 1580 | int order = -1, last_idx = -1; |
2392debc JA |
1581 | struct fib_alias *fa, *fa1 = NULL; |
1582 | u32 last_prio = res->fi->fib_priority; | |
1583 | u8 last_tos = 0; | |
0c838ff1 | 1584 | |
56315f9e | 1585 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 DM |
1586 | struct fib_info *next_fi = fa->fa_info; |
1587 | ||
18a912e9 JA |
1588 | if (fa->fa_slen != slen) |
1589 | continue; | |
2392debc JA |
1590 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
1591 | continue; | |
18a912e9 JA |
1592 | if (fa->tb_id != tb->tb_id) |
1593 | continue; | |
2392debc JA |
1594 | if (next_fi->fib_priority > last_prio && |
1595 | fa->fa_tos == last_tos) { | |
1596 | if (last_tos) | |
1597 | continue; | |
1598 | break; | |
1599 | } | |
1600 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
1601 | continue; | |
1602 | last_tos = fa->fa_tos; | |
1603 | last_prio = next_fi->fib_priority; | |
1604 | ||
37e826c5 | 1605 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1606 | fa->fa_type != RTN_UNICAST) |
1607 | continue; | |
0c838ff1 DM |
1608 | if (!next_fi->fib_nh[0].nh_gw || |
1609 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1610 | continue; | |
1611 | ||
1612 | fib_alias_accessed(fa); | |
1613 | ||
51456b29 | 1614 | if (!fi) { |
0c838ff1 DM |
1615 | if (next_fi != res->fi) |
1616 | break; | |
2392debc | 1617 | fa1 = fa; |
0c838ff1 | 1618 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 1619 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 1620 | fib_result_assign(res, fi); |
2392debc | 1621 | fa1->fa_default = order; |
0c838ff1 DM |
1622 | goto out; |
1623 | } | |
1624 | fi = next_fi; | |
1625 | order++; | |
1626 | } | |
1627 | ||
51456b29 | 1628 | if (order <= 0 || !fi) { |
2392debc JA |
1629 | if (fa1) |
1630 | fa1->fa_default = -1; | |
0c838ff1 DM |
1631 | goto out; |
1632 | } | |
1633 | ||
1634 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 1635 | fa1->fa_default)) { |
0c838ff1 | 1636 | fib_result_assign(res, fi); |
2392debc | 1637 | fa1->fa_default = order; |
0c838ff1 DM |
1638 | goto out; |
1639 | } | |
1640 | ||
1641 | if (last_idx >= 0) | |
1642 | fib_result_assign(res, last_resort); | |
2392debc | 1643 | fa1->fa_default = last_idx; |
0c838ff1 | 1644 | out: |
31d40937 | 1645 | return; |
0c838ff1 DM |
1646 | } |
1647 | ||
1da177e4 | 1648 | /* |
6a31d2a9 ED |
1649 | * Dead device goes up. We wake up dead nexthops. |
1650 | * It takes sense only on multipath routes. | |
1da177e4 | 1651 | */ |
8a3d0316 | 1652 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
1da177e4 LT |
1653 | { |
1654 | struct fib_info *prev_fi; | |
1655 | unsigned int hash; | |
1656 | struct hlist_head *head; | |
1da177e4 LT |
1657 | struct fib_nh *nh; |
1658 | int ret; | |
1659 | ||
6a31d2a9 | 1660 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1661 | return 0; |
1662 | ||
c9b3292e JA |
1663 | if (nh_flags & RTNH_F_DEAD) { |
1664 | unsigned int flags = dev_get_flags(dev); | |
1665 | ||
1666 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1667 | nh_flags |= RTNH_F_LINKDOWN; | |
1668 | } | |
1669 | ||
1da177e4 LT |
1670 | prev_fi = NULL; |
1671 | hash = fib_devindex_hashfn(dev->ifindex); | |
1672 | head = &fib_info_devhash[hash]; | |
1673 | ret = 0; | |
1674 | ||
b67bfe0d | 1675 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1676 | struct fib_info *fi = nh->nh_parent; |
1677 | int alive; | |
1678 | ||
1679 | BUG_ON(!fi->fib_nhs); | |
1680 | if (nh->nh_dev != dev || fi == prev_fi) | |
1681 | continue; | |
1682 | ||
1683 | prev_fi = fi; | |
1684 | alive = 0; | |
1685 | change_nexthops(fi) { | |
8a3d0316 | 1686 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
1da177e4 LT |
1687 | alive++; |
1688 | continue; | |
1689 | } | |
51456b29 | 1690 | if (!nexthop_nh->nh_dev || |
6a31d2a9 | 1691 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1692 | continue; |
71fceff0 DM |
1693 | if (nexthop_nh->nh_dev != dev || |
1694 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1695 | continue; |
1696 | alive++; | |
8a3d0316 | 1697 | nexthop_nh->nh_flags &= ~nh_flags; |
982acb97 | 1698 | call_fib_nh_notifiers(nexthop_nh, FIB_EVENT_NH_ADD); |
1da177e4 LT |
1699 | } endfor_nexthops(fi) |
1700 | ||
1701 | if (alive > 0) { | |
8a3d0316 | 1702 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
1703 | ret++; |
1704 | } | |
0e884c78 PN |
1705 | |
1706 | fib_rebalance(fi); | |
1da177e4 LT |
1707 | } |
1708 | ||
1709 | return ret; | |
1710 | } | |
1711 | ||
8a3d0316 | 1712 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
a6db4494 DA |
1713 | static bool fib_good_nh(const struct fib_nh *nh) |
1714 | { | |
1715 | int state = NUD_REACHABLE; | |
1716 | ||
1717 | if (nh->nh_scope == RT_SCOPE_LINK) { | |
1718 | struct neighbour *n; | |
1719 | ||
1720 | rcu_read_lock_bh(); | |
1721 | ||
d985d151 ED |
1722 | n = __ipv4_neigh_lookup_noref(nh->nh_dev, |
1723 | (__force u32)nh->nh_gw); | |
a6db4494 DA |
1724 | if (n) |
1725 | state = n->nud_state; | |
1726 | ||
1727 | rcu_read_unlock_bh(); | |
1728 | } | |
1729 | ||
1730 | return !!(state & NUD_VALID); | |
1731 | } | |
8a3d0316 | 1732 | |
0e884c78 | 1733 | void fib_select_multipath(struct fib_result *res, int hash) |
1da177e4 LT |
1734 | { |
1735 | struct fib_info *fi = res->fi; | |
a6db4494 DA |
1736 | struct net *net = fi->fib_net; |
1737 | bool first = false; | |
1da177e4 | 1738 | |
0e884c78 PN |
1739 | for_nexthops(fi) { |
1740 | if (hash > atomic_read(&nh->nh_upper_bound)) | |
1741 | continue; | |
1da177e4 | 1742 | |
a6db4494 DA |
1743 | if (!net->ipv4.sysctl_fib_multipath_use_neigh || |
1744 | fib_good_nh(nh)) { | |
1745 | res->nh_sel = nhsel; | |
1746 | return; | |
1747 | } | |
1748 | if (!first) { | |
1749 | res->nh_sel = nhsel; | |
1750 | first = true; | |
1751 | } | |
1da177e4 | 1752 | } endfor_nexthops(fi); |
1da177e4 LT |
1753 | } |
1754 | #endif | |
3ce58d84 DA |
1755 | |
1756 | void fib_select_path(struct net *net, struct fib_result *res, | |
bf4e0a3d | 1757 | struct flowi4 *fl4, const struct sk_buff *skb) |
3ce58d84 | 1758 | { |
7a18c5b9 DA |
1759 | bool oif_check; |
1760 | ||
1761 | oif_check = (fl4->flowi4_oif == 0 || | |
1762 | fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF); | |
1763 | ||
3ce58d84 | 1764 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
7a18c5b9 | 1765 | if (res->fi->fib_nhs > 1 && oif_check) { |
bf4e0a3d | 1766 | int h = fib_multipath_hash(res->fi, fl4, skb); |
9920e48b | 1767 | |
bf4e0a3d | 1768 | fib_select_multipath(res, h); |
3ce58d84 DA |
1769 | } |
1770 | else | |
1771 | #endif | |
1772 | if (!res->prefixlen && | |
1773 | res->table->tb_num_default > 1 && | |
7a18c5b9 | 1774 | res->type == RTN_UNICAST && oif_check) |
3ce58d84 DA |
1775 | fib_select_default(fl4, res); |
1776 | ||
1777 | if (!fl4->saddr) | |
1778 | fl4->saddr = FIB_RES_PREFSRC(net, *res); | |
1779 | } | |
1780 | EXPORT_SYMBOL_GPL(fib_select_path); |