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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 | * ROUTE - implementation of the IP router. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
afd46503 JP |
65 | #define pr_fmt(fmt) "IPv4: " fmt |
66 | ||
1da177e4 LT |
67 | #include <linux/module.h> |
68 | #include <asm/uaccess.h> | |
1da177e4 LT |
69 | #include <linux/bitops.h> |
70 | #include <linux/types.h> | |
71 | #include <linux/kernel.h> | |
1da177e4 | 72 | #include <linux/mm.h> |
424c4b70 | 73 | #include <linux/bootmem.h> |
1da177e4 LT |
74 | #include <linux/string.h> |
75 | #include <linux/socket.h> | |
76 | #include <linux/sockios.h> | |
77 | #include <linux/errno.h> | |
78 | #include <linux/in.h> | |
79 | #include <linux/inet.h> | |
80 | #include <linux/netdevice.h> | |
81 | #include <linux/proc_fs.h> | |
82 | #include <linux/init.h> | |
39c90ece | 83 | #include <linux/workqueue.h> |
1da177e4 | 84 | #include <linux/skbuff.h> |
1da177e4 LT |
85 | #include <linux/inetdevice.h> |
86 | #include <linux/igmp.h> | |
87 | #include <linux/pkt_sched.h> | |
88 | #include <linux/mroute.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
90 | #include <linux/random.h> | |
91 | #include <linux/jhash.h> | |
92 | #include <linux/rcupdate.h> | |
93 | #include <linux/times.h> | |
5a0e3ad6 | 94 | #include <linux/slab.h> |
b9eda06f | 95 | #include <linux/prefetch.h> |
352e512c | 96 | #include <net/dst.h> |
457c4cbc | 97 | #include <net/net_namespace.h> |
1da177e4 LT |
98 | #include <net/protocol.h> |
99 | #include <net/ip.h> | |
100 | #include <net/route.h> | |
101 | #include <net/inetpeer.h> | |
102 | #include <net/sock.h> | |
103 | #include <net/ip_fib.h> | |
104 | #include <net/arp.h> | |
105 | #include <net/tcp.h> | |
106 | #include <net/icmp.h> | |
107 | #include <net/xfrm.h> | |
8d71740c | 108 | #include <net/netevent.h> |
63f3444f | 109 | #include <net/rtnetlink.h> |
1da177e4 LT |
110 | #ifdef CONFIG_SYSCTL |
111 | #include <linux/sysctl.h> | |
7426a564 | 112 | #include <linux/kmemleak.h> |
1da177e4 | 113 | #endif |
6e5714ea | 114 | #include <net/secure_seq.h> |
1da177e4 | 115 | |
68a5e3dd | 116 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 117 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 LT |
118 | |
119 | #define IP_MAX_MTU 0xFFF0 | |
120 | ||
121 | #define RT_GC_TIMEOUT (300*HZ) | |
122 | ||
1da177e4 | 123 | static int ip_rt_max_size; |
817bc4db | 124 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
9f28a2fc | 125 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
817bc4db SH |
126 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; |
127 | static int ip_rt_redirect_number __read_mostly = 9; | |
128 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
129 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
130 | static int ip_rt_error_cost __read_mostly = HZ; | |
131 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
132 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
133 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; | |
134 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
135 | static int ip_rt_min_advmss __read_mostly = 256; | |
1080d709 | 136 | static int rt_chain_length_max __read_mostly = 20; |
1da177e4 | 137 | |
9f28a2fc ED |
138 | static struct delayed_work expires_work; |
139 | static unsigned long expires_ljiffies; | |
140 | ||
1da177e4 LT |
141 | /* |
142 | * Interface to generic destination cache. | |
143 | */ | |
144 | ||
145 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 146 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 147 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
1da177e4 | 148 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 LT |
149 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
150 | static void ipv4_link_failure(struct sk_buff *skb); | |
151 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
e47a185b | 152 | static void ip_do_redirect(struct dst_entry *dst, struct sk_buff *skb); |
569d3645 | 153 | static int rt_garbage_collect(struct dst_ops *ops); |
1da177e4 | 154 | |
72cdd1d9 ED |
155 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
156 | int how) | |
157 | { | |
158 | } | |
1da177e4 | 159 | |
62fa8a84 DM |
160 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
161 | { | |
31248731 DM |
162 | WARN_ON(1); |
163 | return NULL; | |
62fa8a84 DM |
164 | } |
165 | ||
f894cbf8 DM |
166 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
167 | struct sk_buff *skb, | |
168 | const void *daddr); | |
d3aaeb38 | 169 | |
1da177e4 LT |
170 | static struct dst_ops ipv4_dst_ops = { |
171 | .family = AF_INET, | |
09640e63 | 172 | .protocol = cpu_to_be16(ETH_P_IP), |
1da177e4 LT |
173 | .gc = rt_garbage_collect, |
174 | .check = ipv4_dst_check, | |
0dbaee3b | 175 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 176 | .mtu = ipv4_mtu, |
62fa8a84 | 177 | .cow_metrics = ipv4_cow_metrics, |
1da177e4 LT |
178 | .destroy = ipv4_dst_destroy, |
179 | .ifdown = ipv4_dst_ifdown, | |
180 | .negative_advice = ipv4_negative_advice, | |
181 | .link_failure = ipv4_link_failure, | |
182 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 183 | .redirect = ip_do_redirect, |
1ac06e03 | 184 | .local_out = __ip_local_out, |
d3aaeb38 | 185 | .neigh_lookup = ipv4_neigh_lookup, |
1da177e4 LT |
186 | }; |
187 | ||
188 | #define ECN_OR_COST(class) TC_PRIO_##class | |
189 | ||
4839c52b | 190 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 191 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 192 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
193 | TC_PRIO_BESTEFFORT, |
194 | ECN_OR_COST(BESTEFFORT), | |
195 | TC_PRIO_BULK, | |
196 | ECN_OR_COST(BULK), | |
197 | TC_PRIO_BULK, | |
198 | ECN_OR_COST(BULK), | |
199 | TC_PRIO_INTERACTIVE, | |
200 | ECN_OR_COST(INTERACTIVE), | |
201 | TC_PRIO_INTERACTIVE, | |
202 | ECN_OR_COST(INTERACTIVE), | |
203 | TC_PRIO_INTERACTIVE_BULK, | |
204 | ECN_OR_COST(INTERACTIVE_BULK), | |
205 | TC_PRIO_INTERACTIVE_BULK, | |
206 | ECN_OR_COST(INTERACTIVE_BULK) | |
207 | }; | |
d4a96865 | 208 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 LT |
209 | |
210 | /* | |
211 | * Route cache. | |
212 | */ | |
213 | ||
214 | /* The locking scheme is rather straight forward: | |
215 | * | |
216 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
217 | * 2) Only writers remove entries, and they hold the lock | |
218 | * as they look at rtable reference counts. | |
219 | * 3) Only readers acquire references to rtable entries, | |
220 | * they do so with atomic increments and with the | |
221 | * lock held. | |
222 | */ | |
223 | ||
224 | struct rt_hash_bucket { | |
1c31720a | 225 | struct rtable __rcu *chain; |
22c047cc | 226 | }; |
1080d709 | 227 | |
8a25d5de IM |
228 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
229 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
230 | /* |
231 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
232 | * The size of this table is a power of two and depends on the number of CPUS. | |
62051200 | 233 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 234 | */ |
62051200 IM |
235 | #ifdef CONFIG_LOCKDEP |
236 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 237 | #else |
62051200 IM |
238 | # if NR_CPUS >= 32 |
239 | # define RT_HASH_LOCK_SZ 4096 | |
240 | # elif NR_CPUS >= 16 | |
241 | # define RT_HASH_LOCK_SZ 2048 | |
242 | # elif NR_CPUS >= 8 | |
243 | # define RT_HASH_LOCK_SZ 1024 | |
244 | # elif NR_CPUS >= 4 | |
245 | # define RT_HASH_LOCK_SZ 512 | |
246 | # else | |
247 | # define RT_HASH_LOCK_SZ 256 | |
248 | # endif | |
22c047cc ED |
249 | #endif |
250 | ||
251 | static spinlock_t *rt_hash_locks; | |
252 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
1ff1cc20 PE |
253 | |
254 | static __init void rt_hash_lock_init(void) | |
255 | { | |
256 | int i; | |
257 | ||
258 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, | |
259 | GFP_KERNEL); | |
260 | if (!rt_hash_locks) | |
261 | panic("IP: failed to allocate rt_hash_locks\n"); | |
262 | ||
263 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) | |
264 | spin_lock_init(&rt_hash_locks[i]); | |
265 | } | |
22c047cc ED |
266 | #else |
267 | # define rt_hash_lock_addr(slot) NULL | |
1ff1cc20 PE |
268 | |
269 | static inline void rt_hash_lock_init(void) | |
270 | { | |
271 | } | |
22c047cc | 272 | #endif |
1da177e4 | 273 | |
817bc4db | 274 | static struct rt_hash_bucket *rt_hash_table __read_mostly; |
95c96174 | 275 | static unsigned int rt_hash_mask __read_mostly; |
817bc4db | 276 | static unsigned int rt_hash_log __read_mostly; |
1da177e4 | 277 | |
2f970d83 | 278 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
27f39c73 | 279 | #define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field) |
1da177e4 | 280 | |
b00180de | 281 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, |
0eae88f3 | 282 | int genid) |
1da177e4 | 283 | { |
0eae88f3 | 284 | return jhash_3words((__force u32)daddr, (__force u32)saddr, |
b00180de | 285 | idx, genid) |
29e75252 | 286 | & rt_hash_mask; |
1da177e4 LT |
287 | } |
288 | ||
e84f84f2 DL |
289 | static inline int rt_genid(struct net *net) |
290 | { | |
291 | return atomic_read(&net->ipv4.rt_genid); | |
292 | } | |
293 | ||
1da177e4 LT |
294 | #ifdef CONFIG_PROC_FS |
295 | struct rt_cache_iter_state { | |
a75e936f | 296 | struct seq_net_private p; |
1da177e4 | 297 | int bucket; |
29e75252 | 298 | int genid; |
1da177e4 LT |
299 | }; |
300 | ||
1218854a | 301 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
1da177e4 | 302 | { |
1218854a | 303 | struct rt_cache_iter_state *st = seq->private; |
1da177e4 | 304 | struct rtable *r = NULL; |
1da177e4 LT |
305 | |
306 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
33d480ce | 307 | if (!rcu_access_pointer(rt_hash_table[st->bucket].chain)) |
a6272665 | 308 | continue; |
1da177e4 | 309 | rcu_read_lock_bh(); |
a898def2 | 310 | r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); |
29e75252 | 311 | while (r) { |
d8d1f30b | 312 | if (dev_net(r->dst.dev) == seq_file_net(seq) && |
a75e936f | 313 | r->rt_genid == st->genid) |
29e75252 | 314 | return r; |
d8d1f30b | 315 | r = rcu_dereference_bh(r->dst.rt_next); |
29e75252 | 316 | } |
1da177e4 LT |
317 | rcu_read_unlock_bh(); |
318 | } | |
29e75252 | 319 | return r; |
1da177e4 LT |
320 | } |
321 | ||
1218854a | 322 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
642d6318 | 323 | struct rtable *r) |
1da177e4 | 324 | { |
1218854a | 325 | struct rt_cache_iter_state *st = seq->private; |
a6272665 | 326 | |
1c31720a | 327 | r = rcu_dereference_bh(r->dst.rt_next); |
1da177e4 LT |
328 | while (!r) { |
329 | rcu_read_unlock_bh(); | |
a6272665 ED |
330 | do { |
331 | if (--st->bucket < 0) | |
332 | return NULL; | |
33d480ce | 333 | } while (!rcu_access_pointer(rt_hash_table[st->bucket].chain)); |
1da177e4 | 334 | rcu_read_lock_bh(); |
1c31720a | 335 | r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); |
1da177e4 | 336 | } |
1c31720a | 337 | return r; |
1da177e4 LT |
338 | } |
339 | ||
1218854a | 340 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
642d6318 DL |
341 | struct rtable *r) |
342 | { | |
1218854a YH |
343 | struct rt_cache_iter_state *st = seq->private; |
344 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { | |
d8d1f30b | 345 | if (dev_net(r->dst.dev) != seq_file_net(seq)) |
a75e936f | 346 | continue; |
642d6318 DL |
347 | if (r->rt_genid == st->genid) |
348 | break; | |
349 | } | |
350 | return r; | |
351 | } | |
352 | ||
1218854a | 353 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 354 | { |
1218854a | 355 | struct rtable *r = rt_cache_get_first(seq); |
1da177e4 LT |
356 | |
357 | if (r) | |
1218854a | 358 | while (pos && (r = rt_cache_get_next(seq, r))) |
1da177e4 LT |
359 | --pos; |
360 | return pos ? NULL : r; | |
361 | } | |
362 | ||
363 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
364 | { | |
29e75252 | 365 | struct rt_cache_iter_state *st = seq->private; |
29e75252 | 366 | if (*pos) |
1218854a | 367 | return rt_cache_get_idx(seq, *pos - 1); |
e84f84f2 | 368 | st->genid = rt_genid(seq_file_net(seq)); |
29e75252 | 369 | return SEQ_START_TOKEN; |
1da177e4 LT |
370 | } |
371 | ||
372 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
373 | { | |
29e75252 | 374 | struct rtable *r; |
1da177e4 LT |
375 | |
376 | if (v == SEQ_START_TOKEN) | |
1218854a | 377 | r = rt_cache_get_first(seq); |
1da177e4 | 378 | else |
1218854a | 379 | r = rt_cache_get_next(seq, v); |
1da177e4 LT |
380 | ++*pos; |
381 | return r; | |
382 | } | |
383 | ||
384 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
385 | { | |
386 | if (v && v != SEQ_START_TOKEN) | |
387 | rcu_read_unlock_bh(); | |
388 | } | |
389 | ||
390 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
391 | { | |
392 | if (v == SEQ_START_TOKEN) | |
393 | seq_printf(seq, "%-127s\n", | |
394 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
395 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
396 | "HHUptod\tSpecDst"); | |
397 | else { | |
398 | struct rtable *r = v; | |
3c521f2b | 399 | int len; |
218fa90f | 400 | |
0eae88f3 | 401 | seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t" |
794785bf DM |
402 | "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", |
403 | r->dst.dev ? r->dst.dev->name : "*", | |
404 | (__force u32)r->rt_dst, | |
405 | (__force u32)r->rt_gateway, | |
406 | r->rt_flags, atomic_read(&r->dst.__refcnt), | |
407 | r->dst.__use, 0, (__force u32)r->rt_src, | |
408 | dst_metric_advmss(&r->dst) + 40, | |
409 | dst_metric(&r->dst, RTAX_WINDOW), 0, | |
410 | r->rt_key_tos, | |
411 | -1, 0, 0, &len); | |
5e659e4c PE |
412 | |
413 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
e905a9ed YH |
414 | } |
415 | return 0; | |
1da177e4 LT |
416 | } |
417 | ||
f690808e | 418 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
419 | .start = rt_cache_seq_start, |
420 | .next = rt_cache_seq_next, | |
421 | .stop = rt_cache_seq_stop, | |
422 | .show = rt_cache_seq_show, | |
423 | }; | |
424 | ||
425 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
426 | { | |
a75e936f | 427 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 428 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
429 | } |
430 | ||
9a32144e | 431 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
432 | .owner = THIS_MODULE, |
433 | .open = rt_cache_seq_open, | |
434 | .read = seq_read, | |
435 | .llseek = seq_lseek, | |
a75e936f | 436 | .release = seq_release_net, |
1da177e4 LT |
437 | }; |
438 | ||
439 | ||
440 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
441 | { | |
442 | int cpu; | |
443 | ||
444 | if (*pos == 0) | |
445 | return SEQ_START_TOKEN; | |
446 | ||
0f23174a | 447 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
448 | if (!cpu_possible(cpu)) |
449 | continue; | |
450 | *pos = cpu+1; | |
2f970d83 | 451 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
452 | } |
453 | return NULL; | |
454 | } | |
455 | ||
456 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
457 | { | |
458 | int cpu; | |
459 | ||
0f23174a | 460 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
461 | if (!cpu_possible(cpu)) |
462 | continue; | |
463 | *pos = cpu+1; | |
2f970d83 | 464 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
465 | } |
466 | return NULL; | |
e905a9ed | 467 | |
1da177e4 LT |
468 | } |
469 | ||
470 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
471 | { | |
472 | ||
473 | } | |
474 | ||
475 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
476 | { | |
477 | struct rt_cache_stat *st = v; | |
478 | ||
479 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 480 | seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
1da177e4 LT |
481 | return 0; |
482 | } | |
e905a9ed | 483 | |
1da177e4 LT |
484 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
485 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 486 | dst_entries_get_slow(&ipv4_dst_ops), |
1da177e4 LT |
487 | st->in_hit, |
488 | st->in_slow_tot, | |
489 | st->in_slow_mc, | |
490 | st->in_no_route, | |
491 | st->in_brd, | |
492 | st->in_martian_dst, | |
493 | st->in_martian_src, | |
494 | ||
495 | st->out_hit, | |
496 | st->out_slow_tot, | |
e905a9ed | 497 | st->out_slow_mc, |
1da177e4 LT |
498 | |
499 | st->gc_total, | |
500 | st->gc_ignored, | |
501 | st->gc_goal_miss, | |
502 | st->gc_dst_overflow, | |
503 | st->in_hlist_search, | |
504 | st->out_hlist_search | |
505 | ); | |
506 | return 0; | |
507 | } | |
508 | ||
f690808e | 509 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
510 | .start = rt_cpu_seq_start, |
511 | .next = rt_cpu_seq_next, | |
512 | .stop = rt_cpu_seq_stop, | |
513 | .show = rt_cpu_seq_show, | |
514 | }; | |
515 | ||
516 | ||
517 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
518 | { | |
519 | return seq_open(file, &rt_cpu_seq_ops); | |
520 | } | |
521 | ||
9a32144e | 522 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
523 | .owner = THIS_MODULE, |
524 | .open = rt_cpu_seq_open, | |
525 | .read = seq_read, | |
526 | .llseek = seq_lseek, | |
527 | .release = seq_release, | |
528 | }; | |
529 | ||
c7066f70 | 530 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 531 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 532 | { |
a661c419 AD |
533 | struct ip_rt_acct *dst, *src; |
534 | unsigned int i, j; | |
535 | ||
536 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
537 | if (!dst) | |
538 | return -ENOMEM; | |
539 | ||
540 | for_each_possible_cpu(i) { | |
541 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
542 | for (j = 0; j < 256; j++) { | |
543 | dst[j].o_bytes += src[j].o_bytes; | |
544 | dst[j].o_packets += src[j].o_packets; | |
545 | dst[j].i_bytes += src[j].i_bytes; | |
546 | dst[j].i_packets += src[j].i_packets; | |
547 | } | |
78c686e9 PE |
548 | } |
549 | ||
a661c419 AD |
550 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
551 | kfree(dst); | |
552 | return 0; | |
553 | } | |
78c686e9 | 554 | |
a661c419 AD |
555 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
556 | { | |
557 | return single_open(file, rt_acct_proc_show, NULL); | |
78c686e9 | 558 | } |
a661c419 AD |
559 | |
560 | static const struct file_operations rt_acct_proc_fops = { | |
561 | .owner = THIS_MODULE, | |
562 | .open = rt_acct_proc_open, | |
563 | .read = seq_read, | |
564 | .llseek = seq_lseek, | |
565 | .release = single_release, | |
566 | }; | |
78c686e9 | 567 | #endif |
107f1634 | 568 | |
73b38711 | 569 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
570 | { |
571 | struct proc_dir_entry *pde; | |
572 | ||
573 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
574 | &rt_cache_seq_fops); | |
575 | if (!pde) | |
576 | goto err1; | |
577 | ||
77020720 WC |
578 | pde = proc_create("rt_cache", S_IRUGO, |
579 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
580 | if (!pde) |
581 | goto err2; | |
582 | ||
c7066f70 | 583 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 584 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
107f1634 PE |
585 | if (!pde) |
586 | goto err3; | |
587 | #endif | |
588 | return 0; | |
589 | ||
c7066f70 | 590 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
591 | err3: |
592 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
593 | #endif | |
594 | err2: | |
595 | remove_proc_entry("rt_cache", net->proc_net); | |
596 | err1: | |
597 | return -ENOMEM; | |
598 | } | |
73b38711 DL |
599 | |
600 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
601 | { | |
602 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
603 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 604 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 605 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 606 | #endif |
73b38711 DL |
607 | } |
608 | ||
609 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
610 | .init = ip_rt_do_proc_init, | |
611 | .exit = ip_rt_do_proc_exit, | |
612 | }; | |
613 | ||
614 | static int __init ip_rt_proc_init(void) | |
615 | { | |
616 | return register_pernet_subsys(&ip_rt_proc_ops); | |
617 | } | |
618 | ||
107f1634 | 619 | #else |
73b38711 | 620 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
621 | { |
622 | return 0; | |
623 | } | |
1da177e4 | 624 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 625 | |
5969f71d | 626 | static inline void rt_free(struct rtable *rt) |
1da177e4 | 627 | { |
d8d1f30b | 628 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
629 | } |
630 | ||
5969f71d | 631 | static inline void rt_drop(struct rtable *rt) |
1da177e4 | 632 | { |
1da177e4 | 633 | ip_rt_put(rt); |
d8d1f30b | 634 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
635 | } |
636 | ||
5969f71d | 637 | static inline int rt_fast_clean(struct rtable *rth) |
1da177e4 LT |
638 | { |
639 | /* Kill broadcast/multicast entries very aggresively, if they | |
640 | collide in hash table with more useful entries */ | |
641 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
c7537967 | 642 | rt_is_input_route(rth) && rth->dst.rt_next; |
1da177e4 LT |
643 | } |
644 | ||
5969f71d | 645 | static inline int rt_valuable(struct rtable *rth) |
1da177e4 LT |
646 | { |
647 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
5943634f | 648 | rth->dst.expires; |
1da177e4 LT |
649 | } |
650 | ||
651 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
652 | { | |
653 | unsigned long age; | |
654 | int ret = 0; | |
655 | ||
d8d1f30b | 656 | if (atomic_read(&rth->dst.__refcnt)) |
1da177e4 LT |
657 | goto out; |
658 | ||
d8d1f30b | 659 | age = jiffies - rth->dst.lastuse; |
1da177e4 LT |
660 | if ((age <= tmo1 && !rt_fast_clean(rth)) || |
661 | (age <= tmo2 && rt_valuable(rth))) | |
662 | goto out; | |
663 | ret = 1; | |
664 | out: return ret; | |
665 | } | |
666 | ||
667 | /* Bits of score are: | |
668 | * 31: very valuable | |
669 | * 30: not quite useless | |
670 | * 29..0: usage counter | |
671 | */ | |
672 | static inline u32 rt_score(struct rtable *rt) | |
673 | { | |
d8d1f30b | 674 | u32 score = jiffies - rt->dst.lastuse; |
1da177e4 LT |
675 | |
676 | score = ~score & ~(3<<30); | |
677 | ||
678 | if (rt_valuable(rt)) | |
679 | score |= (1<<31); | |
680 | ||
c7537967 | 681 | if (rt_is_output_route(rt) || |
1da177e4 LT |
682 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) |
683 | score |= (1<<30); | |
684 | ||
685 | return score; | |
686 | } | |
687 | ||
1080d709 NH |
688 | static inline bool rt_caching(const struct net *net) |
689 | { | |
690 | return net->ipv4.current_rt_cache_rebuild_count <= | |
691 | net->ipv4.sysctl_rt_cache_rebuild_count; | |
692 | } | |
693 | ||
5e2b61f7 DM |
694 | static inline bool compare_hash_inputs(const struct rtable *rt1, |
695 | const struct rtable *rt2) | |
1080d709 | 696 | { |
5e2b61f7 DM |
697 | return ((((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) | |
698 | ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | | |
97a80410 | 699 | (rt1->rt_route_iif ^ rt2->rt_route_iif)) == 0); |
1080d709 NH |
700 | } |
701 | ||
5e2b61f7 | 702 | static inline int compare_keys(struct rtable *rt1, struct rtable *rt2) |
1da177e4 | 703 | { |
5e2b61f7 DM |
704 | return (((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) | |
705 | ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | | |
706 | (rt1->rt_mark ^ rt2->rt_mark) | | |
475949d8 | 707 | (rt1->rt_key_tos ^ rt2->rt_key_tos) | |
d547f727 | 708 | (rt1->rt_route_iif ^ rt2->rt_route_iif) | |
97a80410 | 709 | (rt1->rt_oif ^ rt2->rt_oif)) == 0; |
1da177e4 LT |
710 | } |
711 | ||
b5921910 DL |
712 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
713 | { | |
d8d1f30b | 714 | return net_eq(dev_net(rt1->dst.dev), dev_net(rt2->dst.dev)); |
b5921910 DL |
715 | } |
716 | ||
e84f84f2 DL |
717 | static inline int rt_is_expired(struct rtable *rth) |
718 | { | |
d8d1f30b | 719 | return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); |
e84f84f2 DL |
720 | } |
721 | ||
beb659bd ED |
722 | /* |
723 | * Perform a full scan of hash table and free all entries. | |
724 | * Can be called by a softirq or a process. | |
725 | * In the later case, we want to be reschedule if necessary | |
726 | */ | |
6561a3b1 | 727 | static void rt_do_flush(struct net *net, int process_context) |
beb659bd ED |
728 | { |
729 | unsigned int i; | |
730 | struct rtable *rth, *next; | |
731 | ||
732 | for (i = 0; i <= rt_hash_mask; i++) { | |
6561a3b1 DM |
733 | struct rtable __rcu **pprev; |
734 | struct rtable *list; | |
735 | ||
beb659bd ED |
736 | if (process_context && need_resched()) |
737 | cond_resched(); | |
33d480ce | 738 | rth = rcu_access_pointer(rt_hash_table[i].chain); |
beb659bd ED |
739 | if (!rth) |
740 | continue; | |
741 | ||
742 | spin_lock_bh(rt_hash_lock_addr(i)); | |
32cb5b4e | 743 | |
6561a3b1 DM |
744 | list = NULL; |
745 | pprev = &rt_hash_table[i].chain; | |
746 | rth = rcu_dereference_protected(*pprev, | |
1c31720a | 747 | lockdep_is_held(rt_hash_lock_addr(i))); |
32cb5b4e | 748 | |
6561a3b1 DM |
749 | while (rth) { |
750 | next = rcu_dereference_protected(rth->dst.rt_next, | |
1c31720a | 751 | lockdep_is_held(rt_hash_lock_addr(i))); |
6561a3b1 DM |
752 | |
753 | if (!net || | |
754 | net_eq(dev_net(rth->dst.dev), net)) { | |
755 | rcu_assign_pointer(*pprev, next); | |
756 | rcu_assign_pointer(rth->dst.rt_next, list); | |
757 | list = rth; | |
32cb5b4e | 758 | } else { |
6561a3b1 | 759 | pprev = &rth->dst.rt_next; |
32cb5b4e | 760 | } |
6561a3b1 | 761 | rth = next; |
32cb5b4e | 762 | } |
6561a3b1 | 763 | |
beb659bd ED |
764 | spin_unlock_bh(rt_hash_lock_addr(i)); |
765 | ||
6561a3b1 DM |
766 | for (; list; list = next) { |
767 | next = rcu_dereference_protected(list->dst.rt_next, 1); | |
768 | rt_free(list); | |
beb659bd ED |
769 | } |
770 | } | |
771 | } | |
772 | ||
1080d709 NH |
773 | /* |
774 | * While freeing expired entries, we compute average chain length | |
775 | * and standard deviation, using fixed-point arithmetic. | |
776 | * This to have an estimation of rt_chain_length_max | |
777 | * rt_chain_length_max = max(elasticity, AVG + 4*SD) | |
778 | * We use 3 bits for frational part, and 29 (or 61) for magnitude. | |
779 | */ | |
780 | ||
781 | #define FRACT_BITS 3 | |
782 | #define ONE (1UL << FRACT_BITS) | |
783 | ||
98376387 ED |
784 | /* |
785 | * Given a hash chain and an item in this hash chain, | |
786 | * find if a previous entry has the same hash_inputs | |
787 | * (but differs on tos, mark or oif) | |
788 | * Returns 0 if an alias is found. | |
789 | * Returns ONE if rth has no alias before itself. | |
790 | */ | |
791 | static int has_noalias(const struct rtable *head, const struct rtable *rth) | |
792 | { | |
793 | const struct rtable *aux = head; | |
794 | ||
795 | while (aux != rth) { | |
5e2b61f7 | 796 | if (compare_hash_inputs(aux, rth)) |
98376387 | 797 | return 0; |
1c31720a | 798 | aux = rcu_dereference_protected(aux->dst.rt_next, 1); |
98376387 ED |
799 | } |
800 | return ONE; | |
801 | } | |
802 | ||
9f28a2fc ED |
803 | static void rt_check_expire(void) |
804 | { | |
805 | static unsigned int rover; | |
806 | unsigned int i = rover, goal; | |
807 | struct rtable *rth; | |
808 | struct rtable __rcu **rthp; | |
809 | unsigned long samples = 0; | |
810 | unsigned long sum = 0, sum2 = 0; | |
811 | unsigned long delta; | |
812 | u64 mult; | |
813 | ||
814 | delta = jiffies - expires_ljiffies; | |
815 | expires_ljiffies = jiffies; | |
816 | mult = ((u64)delta) << rt_hash_log; | |
817 | if (ip_rt_gc_timeout > 1) | |
818 | do_div(mult, ip_rt_gc_timeout); | |
819 | goal = (unsigned int)mult; | |
820 | if (goal > rt_hash_mask) | |
821 | goal = rt_hash_mask + 1; | |
822 | for (; goal > 0; goal--) { | |
823 | unsigned long tmo = ip_rt_gc_timeout; | |
824 | unsigned long length; | |
825 | ||
826 | i = (i + 1) & rt_hash_mask; | |
827 | rthp = &rt_hash_table[i].chain; | |
828 | ||
829 | if (need_resched()) | |
830 | cond_resched(); | |
831 | ||
832 | samples++; | |
833 | ||
834 | if (rcu_dereference_raw(*rthp) == NULL) | |
835 | continue; | |
836 | length = 0; | |
837 | spin_lock_bh(rt_hash_lock_addr(i)); | |
838 | while ((rth = rcu_dereference_protected(*rthp, | |
839 | lockdep_is_held(rt_hash_lock_addr(i)))) != NULL) { | |
840 | prefetch(rth->dst.rt_next); | |
df67e6c9 DM |
841 | if (rt_is_expired(rth) || |
842 | rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
9f28a2fc ED |
843 | *rthp = rth->dst.rt_next; |
844 | rt_free(rth); | |
845 | continue; | |
846 | } | |
df67e6c9 DM |
847 | |
848 | /* We only count entries on a chain with equal | |
849 | * hash inputs once so that entries for | |
850 | * different QOS levels, and other non-hash | |
851 | * input attributes don't unfairly skew the | |
852 | * length computation | |
853 | */ | |
854 | tmo >>= 1; | |
855 | rthp = &rth->dst.rt_next; | |
856 | length += has_noalias(rt_hash_table[i].chain, rth); | |
9f28a2fc ED |
857 | } |
858 | spin_unlock_bh(rt_hash_lock_addr(i)); | |
859 | sum += length; | |
860 | sum2 += length*length; | |
861 | } | |
862 | if (samples) { | |
863 | unsigned long avg = sum / samples; | |
864 | unsigned long sd = int_sqrt(sum2 / samples - avg*avg); | |
865 | rt_chain_length_max = max_t(unsigned long, | |
866 | ip_rt_gc_elasticity, | |
867 | (avg + 4*sd) >> FRACT_BITS); | |
868 | } | |
869 | rover = i; | |
870 | } | |
871 | ||
872 | /* | |
873 | * rt_worker_func() is run in process context. | |
874 | * we call rt_check_expire() to scan part of the hash table | |
875 | */ | |
876 | static void rt_worker_func(struct work_struct *work) | |
877 | { | |
878 | rt_check_expire(); | |
879 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); | |
880 | } | |
881 | ||
29e75252 | 882 | /* |
25985edc | 883 | * Perturbation of rt_genid by a small quantity [1..256] |
29e75252 ED |
884 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() |
885 | * many times (2^24) without giving recent rt_genid. | |
886 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 887 | */ |
86c657f6 | 888 | static void rt_cache_invalidate(struct net *net) |
1da177e4 | 889 | { |
29e75252 | 890 | unsigned char shuffle; |
1da177e4 | 891 | |
29e75252 | 892 | get_random_bytes(&shuffle, sizeof(shuffle)); |
e84f84f2 | 893 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
1da177e4 LT |
894 | } |
895 | ||
29e75252 ED |
896 | /* |
897 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
898 | * delay >= 0 : invalidate & flush cache (can be long) | |
899 | */ | |
76e6ebfb | 900 | void rt_cache_flush(struct net *net, int delay) |
1da177e4 | 901 | { |
86c657f6 | 902 | rt_cache_invalidate(net); |
29e75252 | 903 | if (delay >= 0) |
6561a3b1 | 904 | rt_do_flush(net, !in_softirq()); |
1da177e4 LT |
905 | } |
906 | ||
a5ee1551 | 907 | /* Flush previous cache invalidated entries from the cache */ |
6561a3b1 | 908 | void rt_cache_flush_batch(struct net *net) |
a5ee1551 | 909 | { |
6561a3b1 | 910 | rt_do_flush(net, !in_softirq()); |
a5ee1551 EB |
911 | } |
912 | ||
1080d709 NH |
913 | static void rt_emergency_hash_rebuild(struct net *net) |
914 | { | |
e87cc472 | 915 | net_warn_ratelimited("Route hash chain too long!\n"); |
3ee94372 | 916 | rt_cache_invalidate(net); |
1080d709 NH |
917 | } |
918 | ||
1da177e4 LT |
919 | /* |
920 | Short description of GC goals. | |
921 | ||
922 | We want to build algorithm, which will keep routing cache | |
923 | at some equilibrium point, when number of aged off entries | |
924 | is kept approximately equal to newly generated ones. | |
925 | ||
926 | Current expiration strength is variable "expire". | |
927 | We try to adjust it dynamically, so that if networking | |
928 | is idle expires is large enough to keep enough of warm entries, | |
929 | and when load increases it reduces to limit cache size. | |
930 | */ | |
931 | ||
569d3645 | 932 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
933 | { |
934 | static unsigned long expire = RT_GC_TIMEOUT; | |
935 | static unsigned long last_gc; | |
936 | static int rover; | |
937 | static int equilibrium; | |
1c31720a ED |
938 | struct rtable *rth; |
939 | struct rtable __rcu **rthp; | |
1da177e4 LT |
940 | unsigned long now = jiffies; |
941 | int goal; | |
fc66f95c | 942 | int entries = dst_entries_get_fast(&ipv4_dst_ops); |
1da177e4 LT |
943 | |
944 | /* | |
945 | * Garbage collection is pretty expensive, | |
946 | * do not make it too frequently. | |
947 | */ | |
948 | ||
949 | RT_CACHE_STAT_INC(gc_total); | |
950 | ||
951 | if (now - last_gc < ip_rt_gc_min_interval && | |
fc66f95c | 952 | entries < ip_rt_max_size) { |
1da177e4 LT |
953 | RT_CACHE_STAT_INC(gc_ignored); |
954 | goto out; | |
955 | } | |
956 | ||
fc66f95c | 957 | entries = dst_entries_get_slow(&ipv4_dst_ops); |
1da177e4 | 958 | /* Calculate number of entries, which we want to expire now. */ |
fc66f95c | 959 | goal = entries - (ip_rt_gc_elasticity << rt_hash_log); |
1da177e4 LT |
960 | if (goal <= 0) { |
961 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
962 | equilibrium = ipv4_dst_ops.gc_thresh; | |
fc66f95c | 963 | goal = entries - equilibrium; |
1da177e4 | 964 | if (goal > 0) { |
b790cedd | 965 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
fc66f95c | 966 | goal = entries - equilibrium; |
1da177e4 LT |
967 | } |
968 | } else { | |
969 | /* We are in dangerous area. Try to reduce cache really | |
970 | * aggressively. | |
971 | */ | |
b790cedd | 972 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
fc66f95c | 973 | equilibrium = entries - goal; |
1da177e4 LT |
974 | } |
975 | ||
976 | if (now - last_gc >= ip_rt_gc_min_interval) | |
977 | last_gc = now; | |
978 | ||
979 | if (goal <= 0) { | |
980 | equilibrium += goal; | |
981 | goto work_done; | |
982 | } | |
983 | ||
984 | do { | |
985 | int i, k; | |
986 | ||
987 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
988 | unsigned long tmo = expire; | |
989 | ||
990 | k = (k + 1) & rt_hash_mask; | |
991 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 992 | spin_lock_bh(rt_hash_lock_addr(k)); |
1c31720a ED |
993 | while ((rth = rcu_dereference_protected(*rthp, |
994 | lockdep_is_held(rt_hash_lock_addr(k)))) != NULL) { | |
e84f84f2 | 995 | if (!rt_is_expired(rth) && |
29e75252 | 996 | !rt_may_expire(rth, tmo, expire)) { |
1da177e4 | 997 | tmo >>= 1; |
d8d1f30b | 998 | rthp = &rth->dst.rt_next; |
1da177e4 LT |
999 | continue; |
1000 | } | |
d8d1f30b | 1001 | *rthp = rth->dst.rt_next; |
1da177e4 LT |
1002 | rt_free(rth); |
1003 | goal--; | |
1da177e4 | 1004 | } |
22c047cc | 1005 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
1006 | if (goal <= 0) |
1007 | break; | |
1008 | } | |
1009 | rover = k; | |
1010 | ||
1011 | if (goal <= 0) | |
1012 | goto work_done; | |
1013 | ||
1014 | /* Goal is not achieved. We stop process if: | |
1015 | ||
1016 | - if expire reduced to zero. Otherwise, expire is halfed. | |
1017 | - if table is not full. | |
1018 | - if we are called from interrupt. | |
1019 | - jiffies check is just fallback/debug loop breaker. | |
1020 | We will not spin here for long time in any case. | |
1021 | */ | |
1022 | ||
1023 | RT_CACHE_STAT_INC(gc_goal_miss); | |
1024 | ||
1025 | if (expire == 0) | |
1026 | break; | |
1027 | ||
1028 | expire >>= 1; | |
1da177e4 | 1029 | |
fc66f95c | 1030 | if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size) |
1da177e4 LT |
1031 | goto out; |
1032 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
1033 | ||
fc66f95c ED |
1034 | if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size) |
1035 | goto out; | |
1036 | if (dst_entries_get_slow(&ipv4_dst_ops) < ip_rt_max_size) | |
1da177e4 | 1037 | goto out; |
e87cc472 | 1038 | net_warn_ratelimited("dst cache overflow\n"); |
1da177e4 LT |
1039 | RT_CACHE_STAT_INC(gc_dst_overflow); |
1040 | return 1; | |
1041 | ||
1042 | work_done: | |
1043 | expire += ip_rt_gc_min_interval; | |
1044 | if (expire > ip_rt_gc_timeout || | |
fc66f95c ED |
1045 | dst_entries_get_fast(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh || |
1046 | dst_entries_get_slow(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh) | |
1da177e4 | 1047 | expire = ip_rt_gc_timeout; |
1da177e4 LT |
1048 | out: return 0; |
1049 | } | |
1050 | ||
98376387 ED |
1051 | /* |
1052 | * Returns number of entries in a hash chain that have different hash_inputs | |
1053 | */ | |
1054 | static int slow_chain_length(const struct rtable *head) | |
1055 | { | |
1056 | int length = 0; | |
1057 | const struct rtable *rth = head; | |
1058 | ||
1059 | while (rth) { | |
1060 | length += has_noalias(head, rth); | |
1c31720a | 1061 | rth = rcu_dereference_protected(rth->dst.rt_next, 1); |
98376387 ED |
1062 | } |
1063 | return length >> FRACT_BITS; | |
1064 | } | |
1065 | ||
f894cbf8 DM |
1066 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
1067 | struct sk_buff *skb, | |
1068 | const void *daddr) | |
3769cffb | 1069 | { |
d3aaeb38 DM |
1070 | struct net_device *dev = dst->dev; |
1071 | const __be32 *pkey = daddr; | |
39232973 | 1072 | const struct rtable *rt; |
3769cffb DM |
1073 | struct neighbour *n; |
1074 | ||
39232973 | 1075 | rt = (const struct rtable *) dst; |
a263b309 | 1076 | if (rt->rt_gateway) |
39232973 | 1077 | pkey = (const __be32 *) &rt->rt_gateway; |
f894cbf8 DM |
1078 | else if (skb) |
1079 | pkey = &ip_hdr(skb)->daddr; | |
d3aaeb38 | 1080 | |
80703d26 | 1081 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
d3aaeb38 DM |
1082 | if (n) |
1083 | return n; | |
32092ecf | 1084 | return neigh_create(&arp_tbl, pkey, dev); |
d3aaeb38 DM |
1085 | } |
1086 | ||
95c96174 | 1087 | static struct rtable *rt_intern_hash(unsigned int hash, struct rtable *rt, |
b23dd4fe | 1088 | struct sk_buff *skb, int ifindex) |
1da177e4 | 1089 | { |
1c31720a ED |
1090 | struct rtable *rth, *cand; |
1091 | struct rtable __rcu **rthp, **candp; | |
1da177e4 | 1092 | unsigned long now; |
1da177e4 LT |
1093 | u32 min_score; |
1094 | int chain_length; | |
1da177e4 LT |
1095 | |
1096 | restart: | |
1097 | chain_length = 0; | |
1098 | min_score = ~(u32)0; | |
1099 | cand = NULL; | |
1100 | candp = NULL; | |
1101 | now = jiffies; | |
1102 | ||
7586eceb | 1103 | if (!rt_caching(dev_net(rt->dst.dev)) || (rt->dst.flags & DST_NOCACHE)) { |
73e42897 NH |
1104 | /* |
1105 | * If we're not caching, just tell the caller we | |
1106 | * were successful and don't touch the route. The | |
1107 | * caller hold the sole reference to the cache entry, and | |
1108 | * it will be released when the caller is done with it. | |
1109 | * If we drop it here, the callers have no way to resolve routes | |
1110 | * when we're not caching. Instead, just point *rp at rt, so | |
1111 | * the caller gets a single use out of the route | |
b6280b47 NH |
1112 | * Note that we do rt_free on this new route entry, so that |
1113 | * once its refcount hits zero, we are still able to reap it | |
1114 | * (Thanks Alexey) | |
27b75c95 ED |
1115 | * Note: To avoid expensive rcu stuff for this uncached dst, |
1116 | * we set DST_NOCACHE so that dst_release() can free dst without | |
1117 | * waiting a grace period. | |
73e42897 | 1118 | */ |
b6280b47 | 1119 | |
c7d4426a | 1120 | rt->dst.flags |= DST_NOCACHE; |
b6280b47 | 1121 | goto skip_hashing; |
1080d709 NH |
1122 | } |
1123 | ||
1da177e4 LT |
1124 | rthp = &rt_hash_table[hash].chain; |
1125 | ||
22c047cc | 1126 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1c31720a ED |
1127 | while ((rth = rcu_dereference_protected(*rthp, |
1128 | lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) { | |
e84f84f2 | 1129 | if (rt_is_expired(rth)) { |
d8d1f30b | 1130 | *rthp = rth->dst.rt_next; |
29e75252 ED |
1131 | rt_free(rth); |
1132 | continue; | |
1133 | } | |
5e2b61f7 | 1134 | if (compare_keys(rth, rt) && compare_netns(rth, rt)) { |
1da177e4 | 1135 | /* Put it first */ |
d8d1f30b | 1136 | *rthp = rth->dst.rt_next; |
1da177e4 LT |
1137 | /* |
1138 | * Since lookup is lockfree, the deletion | |
1139 | * must be visible to another weakly ordered CPU before | |
1140 | * the insertion at the start of the hash chain. | |
1141 | */ | |
d8d1f30b | 1142 | rcu_assign_pointer(rth->dst.rt_next, |
1da177e4 LT |
1143 | rt_hash_table[hash].chain); |
1144 | /* | |
1145 | * Since lookup is lockfree, the update writes | |
1146 | * must be ordered for consistency on SMP. | |
1147 | */ | |
1148 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
1149 | ||
d8d1f30b | 1150 | dst_use(&rth->dst, now); |
22c047cc | 1151 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1152 | |
1153 | rt_drop(rt); | |
b23dd4fe | 1154 | if (skb) |
d8d1f30b | 1155 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 1156 | return rth; |
1da177e4 LT |
1157 | } |
1158 | ||
d8d1f30b | 1159 | if (!atomic_read(&rth->dst.__refcnt)) { |
1da177e4 LT |
1160 | u32 score = rt_score(rth); |
1161 | ||
1162 | if (score <= min_score) { | |
1163 | cand = rth; | |
1164 | candp = rthp; | |
1165 | min_score = score; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | chain_length++; | |
1170 | ||
d8d1f30b | 1171 | rthp = &rth->dst.rt_next; |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | if (cand) { | |
1175 | /* ip_rt_gc_elasticity used to be average length of chain | |
1176 | * length, when exceeded gc becomes really aggressive. | |
1177 | * | |
1178 | * The second limit is less certain. At the moment it allows | |
1179 | * only 2 entries per bucket. We will see. | |
1180 | */ | |
1181 | if (chain_length > ip_rt_gc_elasticity) { | |
d8d1f30b | 1182 | *candp = cand->dst.rt_next; |
1da177e4 LT |
1183 | rt_free(cand); |
1184 | } | |
1080d709 | 1185 | } else { |
98376387 ED |
1186 | if (chain_length > rt_chain_length_max && |
1187 | slow_chain_length(rt_hash_table[hash].chain) > rt_chain_length_max) { | |
d8d1f30b | 1188 | struct net *net = dev_net(rt->dst.dev); |
1080d709 | 1189 | int num = ++net->ipv4.current_rt_cache_rebuild_count; |
b35ecb5d | 1190 | if (!rt_caching(net)) { |
058bd4d2 | 1191 | pr_warn("%s: %d rebuilds is over limit, route caching disabled\n", |
d8d1f30b | 1192 | rt->dst.dev->name, num); |
1080d709 | 1193 | } |
b35ecb5d | 1194 | rt_emergency_hash_rebuild(net); |
6a2bad70 PE |
1195 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1196 | ||
5e2b61f7 | 1197 | hash = rt_hash(rt->rt_key_dst, rt->rt_key_src, |
6a2bad70 PE |
1198 | ifindex, rt_genid(net)); |
1199 | goto restart; | |
1080d709 | 1200 | } |
1da177e4 LT |
1201 | } |
1202 | ||
d8d1f30b | 1203 | rt->dst.rt_next = rt_hash_table[hash].chain; |
1080d709 | 1204 | |
00269b54 ED |
1205 | /* |
1206 | * Since lookup is lockfree, we must make sure | |
25985edc | 1207 | * previous writes to rt are committed to memory |
00269b54 ED |
1208 | * before making rt visible to other CPUS. |
1209 | */ | |
1ddbcb00 | 1210 | rcu_assign_pointer(rt_hash_table[hash].chain, rt); |
1080d709 | 1211 | |
22c047cc | 1212 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
73e42897 | 1213 | |
b6280b47 | 1214 | skip_hashing: |
b23dd4fe | 1215 | if (skb) |
d8d1f30b | 1216 | skb_dst_set(skb, &rt->dst); |
b23dd4fe | 1217 | return rt; |
1da177e4 LT |
1218 | } |
1219 | ||
1da177e4 LT |
1220 | /* |
1221 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1222 | * we still can generate some output. | |
1223 | * Random ID selection looks a bit dangerous because we have no chances to | |
1224 | * select ID being unique in a reasonable period of time. | |
1225 | * But broken packet identifier may be better than no packet at all. | |
1226 | */ | |
1227 | static void ip_select_fb_ident(struct iphdr *iph) | |
1228 | { | |
1229 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1230 | static u32 ip_fallback_id; | |
1231 | u32 salt; | |
1232 | ||
1233 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1234 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1235 | iph->id = htons(salt & 0xFFFF); |
1236 | ip_fallback_id = salt; | |
1237 | spin_unlock_bh(&ip_fb_id_lock); | |
1238 | } | |
1239 | ||
1240 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1241 | { | |
1d861aa4 DM |
1242 | struct net *net = dev_net(dst->dev); |
1243 | struct inet_peer *peer; | |
1da177e4 | 1244 | |
1d861aa4 DM |
1245 | peer = inet_getpeer_v4(net->ipv4.peers, iph->daddr, 1); |
1246 | if (peer) { | |
1247 | iph->id = htons(inet_getid(peer, more)); | |
1248 | inet_putpeer(peer); | |
1249 | return; | |
1250 | } | |
1da177e4 LT |
1251 | |
1252 | ip_select_fb_ident(iph); | |
1253 | } | |
4bc2f18b | 1254 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 1255 | |
95c96174 | 1256 | static void rt_del(unsigned int hash, struct rtable *rt) |
1da177e4 | 1257 | { |
1c31720a ED |
1258 | struct rtable __rcu **rthp; |
1259 | struct rtable *aux; | |
1da177e4 | 1260 | |
29e75252 | 1261 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1262 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1263 | ip_rt_put(rt); |
1c31720a ED |
1264 | while ((aux = rcu_dereference_protected(*rthp, |
1265 | lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) { | |
e84f84f2 | 1266 | if (aux == rt || rt_is_expired(aux)) { |
d8d1f30b | 1267 | *rthp = aux->dst.rt_next; |
29e75252 ED |
1268 | rt_free(aux); |
1269 | continue; | |
1da177e4 | 1270 | } |
d8d1f30b | 1271 | rthp = &aux->dst.rt_next; |
29e75252 | 1272 | } |
22c047cc | 1273 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1274 | } |
1275 | ||
e47a185b | 1276 | static void ip_do_redirect(struct dst_entry *dst, struct sk_buff *skb) |
1da177e4 | 1277 | { |
94206125 | 1278 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
e47a185b | 1279 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 1280 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 1281 | struct net_device *dev = skb->dev; |
94206125 DM |
1282 | __be32 daddr = iph->daddr; |
1283 | __be32 saddr = iph->saddr; | |
e47a185b DM |
1284 | struct in_device *in_dev; |
1285 | struct neighbour *n; | |
1286 | struct rtable *rt; | |
317805b8 | 1287 | struct net *net; |
1da177e4 | 1288 | |
94206125 DM |
1289 | switch (icmp_hdr(skb)->code & 7) { |
1290 | case ICMP_REDIR_NET: | |
1291 | case ICMP_REDIR_NETTOS: | |
1292 | case ICMP_REDIR_HOST: | |
1293 | case ICMP_REDIR_HOSTTOS: | |
1294 | break; | |
1295 | ||
1296 | default: | |
1297 | return; | |
1298 | } | |
1299 | ||
e47a185b DM |
1300 | rt = (struct rtable *) dst; |
1301 | if (rt->rt_gateway != old_gw) | |
1302 | return; | |
1303 | ||
1304 | in_dev = __in_dev_get_rcu(dev); | |
1305 | if (!in_dev) | |
1306 | return; | |
1307 | ||
c346dca1 | 1308 | net = dev_net(dev); |
9d4fb27d JP |
1309 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
1310 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
1311 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
1312 | goto reject_redirect; |
1313 | ||
1314 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1315 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1316 | goto reject_redirect; | |
1317 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1318 | goto reject_redirect; | |
1319 | } else { | |
317805b8 | 1320 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1321 | goto reject_redirect; |
1322 | } | |
1323 | ||
e47a185b DM |
1324 | n = ipv4_neigh_lookup(dst, NULL, &new_gw); |
1325 | if (n) { | |
1326 | if (!(n->nud_state & NUD_VALID)) { | |
1327 | neigh_event_send(n, NULL); | |
1328 | } else { | |
1329 | rt->rt_gateway = new_gw; | |
1330 | rt->rt_flags |= RTCF_REDIRECTED; | |
1331 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); | |
1332 | } | |
1333 | neigh_release(n); | |
1334 | } | |
1335 | return; | |
1336 | ||
1337 | reject_redirect: | |
1338 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1339 | if (IN_DEV_LOG_MARTIANS(in_dev)) | |
1340 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" | |
1341 | " Advised path = %pI4 -> %pI4\n", | |
1342 | &old_gw, dev->name, &new_gw, | |
1343 | &saddr, &daddr); | |
1344 | #endif | |
1345 | ; | |
1346 | } | |
1347 | ||
1da177e4 LT |
1348 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
1349 | { | |
ee6b9673 | 1350 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
1351 | struct dst_entry *ret = dst; |
1352 | ||
1353 | if (rt) { | |
d11a4dc1 | 1354 | if (dst->obsolete > 0) { |
1da177e4 LT |
1355 | ip_rt_put(rt); |
1356 | ret = NULL; | |
5943634f DM |
1357 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
1358 | rt->dst.expires) { | |
95c96174 | 1359 | unsigned int hash = rt_hash(rt->rt_key_dst, rt->rt_key_src, |
5e2b61f7 | 1360 | rt->rt_oif, |
e84f84f2 | 1361 | rt_genid(dev_net(dst->dev))); |
1da177e4 LT |
1362 | rt_del(hash, rt); |
1363 | ret = NULL; | |
1364 | } | |
1365 | } | |
1366 | return ret; | |
1367 | } | |
1368 | ||
1369 | /* | |
1370 | * Algorithm: | |
1371 | * 1. The first ip_rt_redirect_number redirects are sent | |
1372 | * with exponential backoff, then we stop sending them at all, | |
1373 | * assuming that the host ignores our redirects. | |
1374 | * 2. If we did not see packets requiring redirects | |
1375 | * during ip_rt_redirect_silence, we assume that the host | |
1376 | * forgot redirected route and start to send redirects again. | |
1377 | * | |
1378 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1379 | * in icmp.c. | |
1380 | * | |
1381 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1382 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1383 | */ | |
1384 | ||
1385 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1386 | { | |
511c3f92 | 1387 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 1388 | struct in_device *in_dev; |
92d86829 | 1389 | struct inet_peer *peer; |
1d861aa4 | 1390 | struct net *net; |
30038fc6 | 1391 | int log_martians; |
1da177e4 | 1392 | |
30038fc6 | 1393 | rcu_read_lock(); |
d8d1f30b | 1394 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
1395 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
1396 | rcu_read_unlock(); | |
1da177e4 | 1397 | return; |
30038fc6 ED |
1398 | } |
1399 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
1400 | rcu_read_unlock(); | |
1da177e4 | 1401 | |
1d861aa4 DM |
1402 | net = dev_net(rt->dst.dev); |
1403 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1); | |
92d86829 DM |
1404 | if (!peer) { |
1405 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1406 | return; | |
1407 | } | |
1408 | ||
1da177e4 LT |
1409 | /* No redirected packets during ip_rt_redirect_silence; |
1410 | * reset the algorithm. | |
1411 | */ | |
92d86829 DM |
1412 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
1413 | peer->rate_tokens = 0; | |
1da177e4 LT |
1414 | |
1415 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 1416 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 1417 | */ |
92d86829 DM |
1418 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
1419 | peer->rate_last = jiffies; | |
1d861aa4 | 1420 | goto out_put_peer; |
1da177e4 LT |
1421 | } |
1422 | ||
1423 | /* Check for load limit; set rate_last to the latest sent | |
1424 | * redirect. | |
1425 | */ | |
92d86829 | 1426 | if (peer->rate_tokens == 0 || |
14fb8a76 | 1427 | time_after(jiffies, |
92d86829 DM |
1428 | (peer->rate_last + |
1429 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
1da177e4 | 1430 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
92d86829 DM |
1431 | peer->rate_last = jiffies; |
1432 | ++peer->rate_tokens; | |
1da177e4 | 1433 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 1434 | if (log_martians && |
e87cc472 JP |
1435 | peer->rate_tokens == ip_rt_redirect_number) |
1436 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", | |
1437 | &ip_hdr(skb)->saddr, rt->rt_iif, | |
1438 | &rt->rt_dst, &rt->rt_gateway); | |
1da177e4 LT |
1439 | #endif |
1440 | } | |
1d861aa4 DM |
1441 | out_put_peer: |
1442 | inet_putpeer(peer); | |
1da177e4 LT |
1443 | } |
1444 | ||
1445 | static int ip_error(struct sk_buff *skb) | |
1446 | { | |
251da413 | 1447 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
511c3f92 | 1448 | struct rtable *rt = skb_rtable(skb); |
92d86829 | 1449 | struct inet_peer *peer; |
1da177e4 | 1450 | unsigned long now; |
251da413 | 1451 | struct net *net; |
92d86829 | 1452 | bool send; |
1da177e4 LT |
1453 | int code; |
1454 | ||
251da413 DM |
1455 | net = dev_net(rt->dst.dev); |
1456 | if (!IN_DEV_FORWARD(in_dev)) { | |
1457 | switch (rt->dst.error) { | |
1458 | case EHOSTUNREACH: | |
1459 | IP_INC_STATS_BH(net, IPSTATS_MIB_INADDRERRORS); | |
1460 | break; | |
1461 | ||
1462 | case ENETUNREACH: | |
1463 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); | |
1464 | break; | |
1465 | } | |
1466 | goto out; | |
1467 | } | |
1468 | ||
d8d1f30b | 1469 | switch (rt->dst.error) { |
4500ebf8 JP |
1470 | case EINVAL: |
1471 | default: | |
1472 | goto out; | |
1473 | case EHOSTUNREACH: | |
1474 | code = ICMP_HOST_UNREACH; | |
1475 | break; | |
1476 | case ENETUNREACH: | |
1477 | code = ICMP_NET_UNREACH; | |
251da413 | 1478 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
1479 | break; |
1480 | case EACCES: | |
1481 | code = ICMP_PKT_FILTERED; | |
1482 | break; | |
1da177e4 LT |
1483 | } |
1484 | ||
1d861aa4 | 1485 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1); |
92d86829 DM |
1486 | |
1487 | send = true; | |
1488 | if (peer) { | |
1489 | now = jiffies; | |
1490 | peer->rate_tokens += now - peer->rate_last; | |
1491 | if (peer->rate_tokens > ip_rt_error_burst) | |
1492 | peer->rate_tokens = ip_rt_error_burst; | |
1493 | peer->rate_last = now; | |
1494 | if (peer->rate_tokens >= ip_rt_error_cost) | |
1495 | peer->rate_tokens -= ip_rt_error_cost; | |
1496 | else | |
1497 | send = false; | |
1d861aa4 | 1498 | inet_putpeer(peer); |
1da177e4 | 1499 | } |
92d86829 DM |
1500 | if (send) |
1501 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
1502 | |
1503 | out: kfree_skb(skb); | |
1504 | return 0; | |
e905a9ed | 1505 | } |
1da177e4 | 1506 | |
1da177e4 LT |
1507 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
1508 | { | |
2c8cec5c | 1509 | struct rtable *rt = (struct rtable *) dst; |
2c8cec5c DM |
1510 | |
1511 | dst_confirm(dst); | |
1512 | ||
5943634f DM |
1513 | if (mtu < ip_rt_min_pmtu) |
1514 | mtu = ip_rt_min_pmtu; | |
2c8cec5c | 1515 | |
5943634f DM |
1516 | rt->rt_pmtu = mtu; |
1517 | dst_set_expires(&rt->dst, ip_rt_mtu_expires); | |
1da177e4 LT |
1518 | } |
1519 | ||
36393395 DM |
1520 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
1521 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1522 | { | |
1523 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
1524 | struct flowi4 fl4; | |
1525 | struct rtable *rt; | |
1526 | ||
1527 | flowi4_init_output(&fl4, oif, mark, RT_TOS(iph->tos), RT_SCOPE_UNIVERSE, | |
3e12939a | 1528 | protocol, flow_flags, |
36393395 DM |
1529 | iph->daddr, iph->saddr, 0, 0); |
1530 | rt = __ip_route_output_key(net, &fl4); | |
1531 | if (!IS_ERR(rt)) { | |
1532 | ip_rt_update_pmtu(&rt->dst, mtu); | |
1533 | ip_rt_put(rt); | |
1534 | } | |
1535 | } | |
1536 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1537 | ||
1538 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1539 | { | |
1540 | const struct inet_sock *inet = inet_sk(sk); | |
1541 | ||
1542 | return ipv4_update_pmtu(skb, sock_net(sk), mtu, | |
1543 | sk->sk_bound_dev_if, sk->sk_mark, | |
1544 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
1545 | inet_sk_flowi_flags(sk)); | |
1546 | } | |
1547 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); | |
f39925db | 1548 | |
b42597e2 DM |
1549 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1550 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1551 | { | |
1552 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
1553 | struct flowi4 fl4; | |
1554 | struct rtable *rt; | |
1555 | ||
1556 | flowi4_init_output(&fl4, oif, mark, RT_TOS(iph->tos), RT_SCOPE_UNIVERSE, | |
1557 | protocol, flow_flags, iph->daddr, iph->saddr, 0, 0); | |
1558 | rt = __ip_route_output_key(net, &fl4); | |
1559 | if (!IS_ERR(rt)) { | |
1560 | ip_do_redirect(&rt->dst, skb); | |
1561 | ip_rt_put(rt); | |
1562 | } | |
1563 | } | |
1564 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1565 | ||
1566 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1567 | { | |
1568 | const struct inet_sock *inet = inet_sk(sk); | |
1569 | ||
1570 | return ipv4_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, | |
1571 | sk->sk_mark, | |
1572 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
1573 | inet_sk_flowi_flags(sk)); | |
1574 | } | |
1575 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1576 | ||
efbc368d DM |
1577 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1578 | { | |
1579 | struct rtable *rt = (struct rtable *) dst; | |
1580 | ||
1581 | if (rt_is_expired(rt)) | |
1582 | return NULL; | |
d11a4dc1 | 1583 | return dst; |
1da177e4 LT |
1584 | } |
1585 | ||
1586 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1587 | { | |
1588 | struct rtable *rt = (struct rtable *) dst; | |
1da177e4 | 1589 | |
62fa8a84 DM |
1590 | if (rt->fi) { |
1591 | fib_info_put(rt->fi); | |
1592 | rt->fi = NULL; | |
1593 | } | |
1da177e4 LT |
1594 | } |
1595 | ||
1da177e4 LT |
1596 | |
1597 | static void ipv4_link_failure(struct sk_buff *skb) | |
1598 | { | |
1599 | struct rtable *rt; | |
1600 | ||
1601 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1602 | ||
511c3f92 | 1603 | rt = skb_rtable(skb); |
5943634f DM |
1604 | if (rt) |
1605 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1606 | } |
1607 | ||
1608 | static int ip_rt_bug(struct sk_buff *skb) | |
1609 | { | |
91df42be JP |
1610 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1611 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1612 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1613 | kfree_skb(skb); |
c378a9c0 | 1614 | WARN_ON(1); |
1da177e4 LT |
1615 | return 0; |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | We do not cache source address of outgoing interface, | |
1620 | because it is used only by IP RR, TS and SRR options, | |
1621 | so that it out of fast path. | |
1622 | ||
1623 | BTW remember: "addr" is allowed to be not aligned | |
1624 | in IP options! | |
1625 | */ | |
1626 | ||
8e36360a | 1627 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1628 | { |
a61ced5d | 1629 | __be32 src; |
1da177e4 | 1630 | |
c7537967 | 1631 | if (rt_is_output_route(rt)) |
c5be24ff | 1632 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1633 | else { |
8e36360a DM |
1634 | struct fib_result res; |
1635 | struct flowi4 fl4; | |
1636 | struct iphdr *iph; | |
1637 | ||
1638 | iph = ip_hdr(skb); | |
1639 | ||
1640 | memset(&fl4, 0, sizeof(fl4)); | |
1641 | fl4.daddr = iph->daddr; | |
1642 | fl4.saddr = iph->saddr; | |
b0fe4a31 | 1643 | fl4.flowi4_tos = RT_TOS(iph->tos); |
8e36360a DM |
1644 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
1645 | fl4.flowi4_iif = skb->dev->ifindex; | |
1646 | fl4.flowi4_mark = skb->mark; | |
5e2b61f7 | 1647 | |
ebc0ffae | 1648 | rcu_read_lock(); |
68a5e3dd | 1649 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) |
436c3b66 | 1650 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
ebc0ffae ED |
1651 | else |
1652 | src = inet_select_addr(rt->dst.dev, rt->rt_gateway, | |
1da177e4 | 1653 | RT_SCOPE_UNIVERSE); |
ebc0ffae ED |
1654 | rcu_read_unlock(); |
1655 | } | |
1da177e4 LT |
1656 | memcpy(addr, &src, 4); |
1657 | } | |
1658 | ||
c7066f70 | 1659 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1660 | static void set_class_tag(struct rtable *rt, u32 tag) |
1661 | { | |
d8d1f30b CG |
1662 | if (!(rt->dst.tclassid & 0xFFFF)) |
1663 | rt->dst.tclassid |= tag & 0xFFFF; | |
1664 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1665 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1666 | } |
1667 | #endif | |
1668 | ||
0dbaee3b DM |
1669 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1670 | { | |
1671 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); | |
1672 | ||
1673 | if (advmss == 0) { | |
1674 | advmss = max_t(unsigned int, dst->dev->mtu - 40, | |
1675 | ip_rt_min_advmss); | |
1676 | if (advmss > 65535 - 40) | |
1677 | advmss = 65535 - 40; | |
1678 | } | |
1679 | return advmss; | |
1680 | } | |
1681 | ||
ebb762f2 | 1682 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1683 | { |
261663b0 | 1684 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1685 | unsigned int mtu = rt->rt_pmtu; |
1686 | ||
1687 | if (mtu && time_after_eq(jiffies, rt->dst.expires)) | |
1688 | mtu = 0; | |
1689 | ||
1690 | if (!mtu) | |
1691 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1692 | |
261663b0 | 1693 | if (mtu && rt_is_output_route(rt)) |
618f9bc7 SK |
1694 | return mtu; |
1695 | ||
1696 | mtu = dst->dev->mtu; | |
d33e4553 DM |
1697 | |
1698 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { | |
d33e4553 DM |
1699 | |
1700 | if (rt->rt_gateway != rt->rt_dst && mtu > 576) | |
1701 | mtu = 576; | |
1702 | } | |
1703 | ||
1704 | if (mtu > IP_MAX_MTU) | |
1705 | mtu = IP_MAX_MTU; | |
1706 | ||
1707 | return mtu; | |
1708 | } | |
1709 | ||
813b3b5d | 1710 | static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4, |
5e2b61f7 | 1711 | struct fib_info *fi) |
a4daad6b | 1712 | { |
f185071d DM |
1713 | if (fi->fib_metrics != (u32 *) dst_default_metrics) { |
1714 | rt->fi = fi; | |
1715 | atomic_inc(&fi->fib_clntref); | |
a4daad6b | 1716 | } |
f185071d | 1717 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
a4daad6b DM |
1718 | } |
1719 | ||
813b3b5d | 1720 | static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4, |
5e2b61f7 | 1721 | const struct fib_result *res, |
982721f3 | 1722 | struct fib_info *fi, u16 type, u32 itag) |
1da177e4 | 1723 | { |
1da177e4 LT |
1724 | if (fi) { |
1725 | if (FIB_RES_GW(*res) && | |
1726 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1727 | rt->rt_gateway = FIB_RES_GW(*res); | |
813b3b5d | 1728 | rt_init_metrics(rt, fl4, fi); |
c7066f70 | 1729 | #ifdef CONFIG_IP_ROUTE_CLASSID |
710ab6c0 | 1730 | rt->dst.tclassid = FIB_RES_NH(*res).nh_tclassid; |
1da177e4 | 1731 | #endif |
d33e4553 | 1732 | } |
defb3519 | 1733 | |
c7066f70 | 1734 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1735 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1736 | set_class_tag(rt, fib_rules_tclass(res)); | |
1737 | #endif | |
1738 | set_class_tag(rt, itag); | |
1739 | #endif | |
1da177e4 LT |
1740 | } |
1741 | ||
5c1e6aa3 DM |
1742 | static struct rtable *rt_dst_alloc(struct net_device *dev, |
1743 | bool nopolicy, bool noxfrm) | |
0c4dcd58 | 1744 | { |
5c1e6aa3 DM |
1745 | return dst_alloc(&ipv4_dst_ops, dev, 1, -1, |
1746 | DST_HOST | | |
1747 | (nopolicy ? DST_NOPOLICY : 0) | | |
1748 | (noxfrm ? DST_NOXFRM : 0)); | |
0c4dcd58 DM |
1749 | } |
1750 | ||
96d36220 | 1751 | /* called in rcu_read_lock() section */ |
9e12bb22 | 1752 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1753 | u8 tos, struct net_device *dev, int our) |
1754 | { | |
96d36220 | 1755 | unsigned int hash; |
1da177e4 | 1756 | struct rtable *rth; |
96d36220 | 1757 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1758 | u32 itag = 0; |
b5f7e755 | 1759 | int err; |
1da177e4 LT |
1760 | |
1761 | /* Primary sanity checks. */ | |
1762 | ||
1763 | if (in_dev == NULL) | |
1764 | return -EINVAL; | |
1765 | ||
1e637c74 | 1766 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1767 | skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1768 | goto e_inval; |
1769 | ||
d0daebc3 TG |
1770 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
1771 | if (ipv4_is_loopback(saddr)) | |
1772 | goto e_inval; | |
1773 | ||
f97c1e0c JP |
1774 | if (ipv4_is_zeronet(saddr)) { |
1775 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 | 1776 | goto e_inval; |
b5f7e755 | 1777 | } else { |
9e56e380 DM |
1778 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
1779 | in_dev, &itag); | |
b5f7e755 ED |
1780 | if (err < 0) |
1781 | goto e_err; | |
1782 | } | |
4e7b2f14 | 1783 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, |
5c1e6aa3 | 1784 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false); |
1da177e4 LT |
1785 | if (!rth) |
1786 | goto e_nobufs; | |
1787 | ||
cf911662 DM |
1788 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1789 | rth->dst.tclassid = itag; | |
1790 | #endif | |
d8d1f30b | 1791 | rth->dst.output = ip_rt_bug; |
1da177e4 | 1792 | |
5e2b61f7 | 1793 | rth->rt_key_dst = daddr; |
5e2b61f7 | 1794 | rth->rt_key_src = saddr; |
cf911662 DM |
1795 | rth->rt_genid = rt_genid(dev_net(dev)); |
1796 | rth->rt_flags = RTCF_MULTICAST; | |
1797 | rth->rt_type = RTN_MULTICAST; | |
475949d8 | 1798 | rth->rt_key_tos = tos; |
cf911662 | 1799 | rth->rt_dst = daddr; |
1da177e4 | 1800 | rth->rt_src = saddr; |
1b86a58f | 1801 | rth->rt_route_iif = dev->ifindex; |
5e2b61f7 | 1802 | rth->rt_iif = dev->ifindex; |
5e2b61f7 | 1803 | rth->rt_oif = 0; |
cf911662 | 1804 | rth->rt_mark = skb->mark; |
5943634f | 1805 | rth->rt_pmtu = 0; |
1da177e4 | 1806 | rth->rt_gateway = daddr; |
cf911662 | 1807 | rth->fi = NULL; |
1da177e4 | 1808 | if (our) { |
d8d1f30b | 1809 | rth->dst.input= ip_local_deliver; |
1da177e4 LT |
1810 | rth->rt_flags |= RTCF_LOCAL; |
1811 | } | |
1812 | ||
1813 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1814 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1815 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1816 | #endif |
1817 | RT_CACHE_STAT_INC(in_slow_mc); | |
1818 | ||
e84f84f2 | 1819 | hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev))); |
b23dd4fe | 1820 | rth = rt_intern_hash(hash, rth, skb, dev->ifindex); |
9aa3c94c | 1821 | return IS_ERR(rth) ? PTR_ERR(rth) : 0; |
1da177e4 LT |
1822 | |
1823 | e_nobufs: | |
1da177e4 | 1824 | return -ENOBUFS; |
1da177e4 | 1825 | e_inval: |
96d36220 | 1826 | return -EINVAL; |
b5f7e755 | 1827 | e_err: |
b5f7e755 | 1828 | return err; |
1da177e4 LT |
1829 | } |
1830 | ||
1831 | ||
1832 | static void ip_handle_martian_source(struct net_device *dev, | |
1833 | struct in_device *in_dev, | |
1834 | struct sk_buff *skb, | |
9e12bb22 AV |
1835 | __be32 daddr, |
1836 | __be32 saddr) | |
1da177e4 LT |
1837 | { |
1838 | RT_CACHE_STAT_INC(in_martian_src); | |
1839 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1840 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1841 | /* | |
1842 | * RFC1812 recommendation, if source is martian, | |
1843 | * the only hint is MAC header. | |
1844 | */ | |
058bd4d2 | 1845 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1846 | &daddr, &saddr, dev->name); |
98e399f8 | 1847 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1848 | print_hex_dump(KERN_WARNING, "ll header: ", |
1849 | DUMP_PREFIX_OFFSET, 16, 1, | |
1850 | skb_mac_header(skb), | |
1851 | dev->hard_header_len, true); | |
1da177e4 LT |
1852 | } |
1853 | } | |
1854 | #endif | |
1855 | } | |
1856 | ||
47360228 | 1857 | /* called in rcu_read_lock() section */ |
5969f71d | 1858 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1859 | const struct fib_result *res, |
5969f71d SH |
1860 | struct in_device *in_dev, |
1861 | __be32 daddr, __be32 saddr, u32 tos, | |
1862 | struct rtable **result) | |
1da177e4 | 1863 | { |
1da177e4 LT |
1864 | struct rtable *rth; |
1865 | int err; | |
1866 | struct in_device *out_dev; | |
47360228 | 1867 | unsigned int flags = 0; |
d9c9df8c | 1868 | u32 itag; |
1da177e4 LT |
1869 | |
1870 | /* get a working reference to the output device */ | |
47360228 | 1871 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
1da177e4 | 1872 | if (out_dev == NULL) { |
e87cc472 | 1873 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1874 | return -EINVAL; |
1875 | } | |
1876 | ||
1877 | ||
5c04c819 | 1878 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1879 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1880 | if (err < 0) { |
e905a9ed | 1881 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1882 | saddr); |
e905a9ed | 1883 | |
1da177e4 LT |
1884 | goto cleanup; |
1885 | } | |
1886 | ||
1887 | if (err) | |
1888 | flags |= RTCF_DIRECTSRC; | |
1889 | ||
51b77cae | 1890 | if (out_dev == in_dev && err && |
1da177e4 LT |
1891 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1892 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1893 | flags |= RTCF_DOREDIRECT; | |
1894 | ||
1895 | if (skb->protocol != htons(ETH_P_IP)) { | |
1896 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1897 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1898 | * |
1899 | * Proxy arp feature have been extended to allow, ARP | |
1900 | * replies back to the same interface, to support | |
1901 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1902 | */ |
65324144 JDB |
1903 | if (out_dev == in_dev && |
1904 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1905 | err = -EINVAL; |
1906 | goto cleanup; | |
1907 | } | |
1908 | } | |
1909 | ||
5c1e6aa3 DM |
1910 | rth = rt_dst_alloc(out_dev->dev, |
1911 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
0c4dcd58 | 1912 | IN_DEV_CONF_GET(out_dev, NOXFRM)); |
1da177e4 LT |
1913 | if (!rth) { |
1914 | err = -ENOBUFS; | |
1915 | goto cleanup; | |
1916 | } | |
1917 | ||
5e2b61f7 | 1918 | rth->rt_key_dst = daddr; |
5e2b61f7 | 1919 | rth->rt_key_src = saddr; |
cf911662 DM |
1920 | rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); |
1921 | rth->rt_flags = flags; | |
1922 | rth->rt_type = res->type; | |
475949d8 | 1923 | rth->rt_key_tos = tos; |
cf911662 | 1924 | rth->rt_dst = daddr; |
1da177e4 | 1925 | rth->rt_src = saddr; |
1b86a58f | 1926 | rth->rt_route_iif = in_dev->dev->ifindex; |
5e2b61f7 | 1927 | rth->rt_iif = in_dev->dev->ifindex; |
5e2b61f7 | 1928 | rth->rt_oif = 0; |
cf911662 | 1929 | rth->rt_mark = skb->mark; |
5943634f | 1930 | rth->rt_pmtu = 0; |
cf911662 | 1931 | rth->rt_gateway = daddr; |
cf911662 | 1932 | rth->fi = NULL; |
1da177e4 | 1933 | |
d8d1f30b CG |
1934 | rth->dst.input = ip_forward; |
1935 | rth->dst.output = ip_output; | |
1da177e4 | 1936 | |
5e2b61f7 | 1937 | rt_set_nexthop(rth, NULL, res, res->fi, res->type, itag); |
1da177e4 | 1938 | |
1da177e4 LT |
1939 | *result = rth; |
1940 | err = 0; | |
1941 | cleanup: | |
1da177e4 | 1942 | return err; |
e905a9ed | 1943 | } |
1da177e4 | 1944 | |
5969f71d SH |
1945 | static int ip_mkroute_input(struct sk_buff *skb, |
1946 | struct fib_result *res, | |
68a5e3dd | 1947 | const struct flowi4 *fl4, |
5969f71d SH |
1948 | struct in_device *in_dev, |
1949 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1950 | { |
5e73ea1a | 1951 | struct rtable *rth = NULL; |
1da177e4 | 1952 | int err; |
95c96174 | 1953 | unsigned int hash; |
1da177e4 LT |
1954 | |
1955 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
ff3fccb3 | 1956 | if (res->fi && res->fi->fib_nhs > 1) |
1b7fe593 | 1957 | fib_select_multipath(res); |
1da177e4 LT |
1958 | #endif |
1959 | ||
1960 | /* create a routing cache entry */ | |
1961 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1962 | if (err) | |
1963 | return err; | |
1da177e4 LT |
1964 | |
1965 | /* put it into the cache */ | |
68a5e3dd | 1966 | hash = rt_hash(daddr, saddr, fl4->flowi4_iif, |
d8d1f30b | 1967 | rt_genid(dev_net(rth->dst.dev))); |
68a5e3dd | 1968 | rth = rt_intern_hash(hash, rth, skb, fl4->flowi4_iif); |
b23dd4fe DM |
1969 | if (IS_ERR(rth)) |
1970 | return PTR_ERR(rth); | |
1971 | return 0; | |
1da177e4 LT |
1972 | } |
1973 | ||
1da177e4 LT |
1974 | /* |
1975 | * NOTE. We drop all the packets that has local source | |
1976 | * addresses, because every properly looped back packet | |
1977 | * must have correct destination already attached by output routine. | |
1978 | * | |
1979 | * Such approach solves two big problems: | |
1980 | * 1. Not simplex devices are handled properly. | |
1981 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 1982 | * called with rcu_read_lock() |
1da177e4 LT |
1983 | */ |
1984 | ||
9e12bb22 | 1985 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
c10237e0 | 1986 | u8 tos, struct net_device *dev) |
1da177e4 LT |
1987 | { |
1988 | struct fib_result res; | |
96d36220 | 1989 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
68a5e3dd | 1990 | struct flowi4 fl4; |
95c96174 | 1991 | unsigned int flags = 0; |
1da177e4 | 1992 | u32 itag = 0; |
95c96174 ED |
1993 | struct rtable *rth; |
1994 | unsigned int hash; | |
1da177e4 | 1995 | int err = -EINVAL; |
5e73ea1a | 1996 | struct net *net = dev_net(dev); |
1da177e4 LT |
1997 | |
1998 | /* IP on this device is disabled. */ | |
1999 | ||
2000 | if (!in_dev) | |
2001 | goto out; | |
2002 | ||
2003 | /* Check for the most weird martians, which can be not detected | |
2004 | by fib_lookup. | |
2005 | */ | |
2006 | ||
d0daebc3 | 2007 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
2008 | goto martian_source; |
2009 | ||
27a954bd | 2010 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2011 | goto brd_input; |
2012 | ||
2013 | /* Accept zero addresses only to limited broadcast; | |
2014 | * I even do not know to fix it or not. Waiting for complains :-) | |
2015 | */ | |
f97c1e0c | 2016 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2017 | goto martian_source; |
2018 | ||
d0daebc3 | 2019 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
2020 | goto martian_destination; |
2021 | ||
d0daebc3 TG |
2022 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) { |
2023 | if (ipv4_is_loopback(daddr)) | |
2024 | goto martian_destination; | |
2025 | ||
2026 | if (ipv4_is_loopback(saddr)) | |
2027 | goto martian_source; | |
2028 | } | |
2029 | ||
1da177e4 LT |
2030 | /* |
2031 | * Now we are ready to route packet. | |
2032 | */ | |
68a5e3dd DM |
2033 | fl4.flowi4_oif = 0; |
2034 | fl4.flowi4_iif = dev->ifindex; | |
2035 | fl4.flowi4_mark = skb->mark; | |
2036 | fl4.flowi4_tos = tos; | |
2037 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
2038 | fl4.daddr = daddr; | |
2039 | fl4.saddr = saddr; | |
2040 | err = fib_lookup(net, &fl4, &res); | |
251da413 | 2041 | if (err != 0) |
1da177e4 | 2042 | goto no_route; |
1da177e4 LT |
2043 | |
2044 | RT_CACHE_STAT_INC(in_slow_tot); | |
2045 | ||
2046 | if (res.type == RTN_BROADCAST) | |
2047 | goto brd_input; | |
2048 | ||
2049 | if (res.type == RTN_LOCAL) { | |
5c04c819 | 2050 | err = fib_validate_source(skb, saddr, daddr, tos, |
ebc0ffae | 2051 | net->loopback_dev->ifindex, |
9e56e380 | 2052 | dev, in_dev, &itag); |
b5f7e755 ED |
2053 | if (err < 0) |
2054 | goto martian_source_keep_err; | |
2055 | if (err) | |
1da177e4 | 2056 | flags |= RTCF_DIRECTSRC; |
1da177e4 LT |
2057 | goto local_input; |
2058 | } | |
2059 | ||
2060 | if (!IN_DEV_FORWARD(in_dev)) | |
251da413 | 2061 | goto no_route; |
1da177e4 LT |
2062 | if (res.type != RTN_UNICAST) |
2063 | goto martian_destination; | |
2064 | ||
68a5e3dd | 2065 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
1da177e4 LT |
2066 | out: return err; |
2067 | ||
2068 | brd_input: | |
2069 | if (skb->protocol != htons(ETH_P_IP)) | |
2070 | goto e_inval; | |
2071 | ||
41347dcd | 2072 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
2073 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
2074 | in_dev, &itag); | |
1da177e4 | 2075 | if (err < 0) |
b5f7e755 | 2076 | goto martian_source_keep_err; |
1da177e4 LT |
2077 | if (err) |
2078 | flags |= RTCF_DIRECTSRC; | |
2079 | } | |
2080 | flags |= RTCF_BROADCAST; | |
2081 | res.type = RTN_BROADCAST; | |
2082 | RT_CACHE_STAT_INC(in_brd); | |
2083 | ||
2084 | local_input: | |
5c1e6aa3 DM |
2085 | rth = rt_dst_alloc(net->loopback_dev, |
2086 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false); | |
1da177e4 LT |
2087 | if (!rth) |
2088 | goto e_nobufs; | |
2089 | ||
cf911662 | 2090 | rth->dst.input= ip_local_deliver; |
d8d1f30b | 2091 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
2092 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2093 | rth->dst.tclassid = itag; | |
2094 | #endif | |
1da177e4 | 2095 | |
5e2b61f7 | 2096 | rth->rt_key_dst = daddr; |
5e2b61f7 | 2097 | rth->rt_key_src = saddr; |
cf911662 DM |
2098 | rth->rt_genid = rt_genid(net); |
2099 | rth->rt_flags = flags|RTCF_LOCAL; | |
2100 | rth->rt_type = res.type; | |
475949d8 | 2101 | rth->rt_key_tos = tos; |
cf911662 | 2102 | rth->rt_dst = daddr; |
1da177e4 | 2103 | rth->rt_src = saddr; |
1b86a58f | 2104 | rth->rt_route_iif = dev->ifindex; |
5e2b61f7 | 2105 | rth->rt_iif = dev->ifindex; |
cf911662 DM |
2106 | rth->rt_oif = 0; |
2107 | rth->rt_mark = skb->mark; | |
5943634f | 2108 | rth->rt_pmtu = 0; |
1da177e4 | 2109 | rth->rt_gateway = daddr; |
cf911662 | 2110 | rth->fi = NULL; |
1da177e4 | 2111 | if (res.type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2112 | rth->dst.input= ip_error; |
2113 | rth->dst.error= -err; | |
1da177e4 LT |
2114 | rth->rt_flags &= ~RTCF_LOCAL; |
2115 | } | |
68a5e3dd DM |
2116 | hash = rt_hash(daddr, saddr, fl4.flowi4_iif, rt_genid(net)); |
2117 | rth = rt_intern_hash(hash, rth, skb, fl4.flowi4_iif); | |
b23dd4fe DM |
2118 | err = 0; |
2119 | if (IS_ERR(rth)) | |
2120 | err = PTR_ERR(rth); | |
ebc0ffae | 2121 | goto out; |
1da177e4 LT |
2122 | |
2123 | no_route: | |
2124 | RT_CACHE_STAT_INC(in_no_route); | |
1da177e4 | 2125 | res.type = RTN_UNREACHABLE; |
7f53878d MC |
2126 | if (err == -ESRCH) |
2127 | err = -ENETUNREACH; | |
1da177e4 LT |
2128 | goto local_input; |
2129 | ||
2130 | /* | |
2131 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2132 | */ | |
2133 | martian_destination: | |
2134 | RT_CACHE_STAT_INC(in_martian_dst); | |
2135 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
2136 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
2137 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
2138 | &daddr, &saddr, dev->name); | |
1da177e4 | 2139 | #endif |
2c2910a4 | 2140 | |
1da177e4 LT |
2141 | e_inval: |
2142 | err = -EINVAL; | |
ebc0ffae | 2143 | goto out; |
1da177e4 LT |
2144 | |
2145 | e_nobufs: | |
2146 | err = -ENOBUFS; | |
ebc0ffae | 2147 | goto out; |
1da177e4 LT |
2148 | |
2149 | martian_source: | |
b5f7e755 ED |
2150 | err = -EINVAL; |
2151 | martian_source_keep_err: | |
1da177e4 | 2152 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
ebc0ffae | 2153 | goto out; |
1da177e4 LT |
2154 | } |
2155 | ||
407eadd9 | 2156 | int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
c10237e0 | 2157 | u8 tos, struct net_device *dev, bool noref) |
1da177e4 | 2158 | { |
95c96174 ED |
2159 | struct rtable *rth; |
2160 | unsigned int hash; | |
1da177e4 | 2161 | int iif = dev->ifindex; |
b5921910 | 2162 | struct net *net; |
96d36220 | 2163 | int res; |
1da177e4 | 2164 | |
c346dca1 | 2165 | net = dev_net(dev); |
1080d709 | 2166 | |
96d36220 ED |
2167 | rcu_read_lock(); |
2168 | ||
1080d709 NH |
2169 | if (!rt_caching(net)) |
2170 | goto skip_cache; | |
2171 | ||
1da177e4 | 2172 | tos &= IPTOS_RT_MASK; |
e84f84f2 | 2173 | hash = rt_hash(daddr, saddr, iif, rt_genid(net)); |
1da177e4 | 2174 | |
1da177e4 | 2175 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
d8d1f30b | 2176 | rth = rcu_dereference(rth->dst.rt_next)) { |
5e2b61f7 DM |
2177 | if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) | |
2178 | ((__force u32)rth->rt_key_src ^ (__force u32)saddr) | | |
97a80410 | 2179 | (rth->rt_route_iif ^ iif) | |
475949d8 | 2180 | (rth->rt_key_tos ^ tos)) == 0 && |
5e2b61f7 | 2181 | rth->rt_mark == skb->mark && |
d8d1f30b | 2182 | net_eq(dev_net(rth->dst.dev), net) && |
e84f84f2 | 2183 | !rt_is_expired(rth)) { |
407eadd9 | 2184 | if (noref) { |
d8d1f30b CG |
2185 | dst_use_noref(&rth->dst, jiffies); |
2186 | skb_dst_set_noref(skb, &rth->dst); | |
407eadd9 | 2187 | } else { |
d8d1f30b CG |
2188 | dst_use(&rth->dst, jiffies); |
2189 | skb_dst_set(skb, &rth->dst); | |
407eadd9 | 2190 | } |
1da177e4 LT |
2191 | RT_CACHE_STAT_INC(in_hit); |
2192 | rcu_read_unlock(); | |
1da177e4 LT |
2193 | return 0; |
2194 | } | |
2195 | RT_CACHE_STAT_INC(in_hlist_search); | |
2196 | } | |
1da177e4 | 2197 | |
1080d709 | 2198 | skip_cache: |
1da177e4 LT |
2199 | /* Multicast recognition logic is moved from route cache to here. |
2200 | The problem was that too many Ethernet cards have broken/missing | |
2201 | hardware multicast filters :-( As result the host on multicasting | |
2202 | network acquires a lot of useless route cache entries, sort of | |
2203 | SDR messages from all the world. Now we try to get rid of them. | |
2204 | Really, provided software IP multicast filter is organized | |
2205 | reasonably (at least, hashed), it does not result in a slowdown | |
2206 | comparing with route cache reject entries. | |
2207 | Note, that multicast routers are not affected, because | |
2208 | route cache entry is created eventually. | |
2209 | */ | |
f97c1e0c | 2210 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2211 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 2212 | |
96d36220 | 2213 | if (in_dev) { |
dbdd9a52 DM |
2214 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
2215 | ip_hdr(skb)->protocol); | |
1da177e4 LT |
2216 | if (our |
2217 | #ifdef CONFIG_IP_MROUTE | |
9d4fb27d JP |
2218 | || |
2219 | (!ipv4_is_local_multicast(daddr) && | |
2220 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2221 | #endif |
9d4fb27d | 2222 | ) { |
96d36220 ED |
2223 | int res = ip_route_input_mc(skb, daddr, saddr, |
2224 | tos, dev, our); | |
1da177e4 | 2225 | rcu_read_unlock(); |
96d36220 | 2226 | return res; |
1da177e4 LT |
2227 | } |
2228 | } | |
2229 | rcu_read_unlock(); | |
2230 | return -EINVAL; | |
2231 | } | |
c10237e0 | 2232 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
96d36220 ED |
2233 | rcu_read_unlock(); |
2234 | return res; | |
1da177e4 | 2235 | } |
407eadd9 | 2236 | EXPORT_SYMBOL(ip_route_input_common); |
1da177e4 | 2237 | |
ebc0ffae | 2238 | /* called with rcu_read_lock() */ |
982721f3 | 2239 | static struct rtable *__mkroute_output(const struct fib_result *res, |
68a5e3dd | 2240 | const struct flowi4 *fl4, |
813b3b5d | 2241 | __be32 orig_daddr, __be32 orig_saddr, |
f61759e6 JA |
2242 | int orig_oif, __u8 orig_rtos, |
2243 | struct net_device *dev_out, | |
5ada5527 | 2244 | unsigned int flags) |
1da177e4 | 2245 | { |
982721f3 | 2246 | struct fib_info *fi = res->fi; |
5ada5527 | 2247 | struct in_device *in_dev; |
982721f3 | 2248 | u16 type = res->type; |
5ada5527 | 2249 | struct rtable *rth; |
1da177e4 | 2250 | |
d0daebc3 TG |
2251 | in_dev = __in_dev_get_rcu(dev_out); |
2252 | if (!in_dev) | |
5ada5527 | 2253 | return ERR_PTR(-EINVAL); |
1da177e4 | 2254 | |
d0daebc3 TG |
2255 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
2256 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) | |
2257 | return ERR_PTR(-EINVAL); | |
2258 | ||
68a5e3dd | 2259 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2260 | type = RTN_BROADCAST; |
68a5e3dd | 2261 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2262 | type = RTN_MULTICAST; |
68a5e3dd | 2263 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2264 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2265 | |
2266 | if (dev_out->flags & IFF_LOOPBACK) | |
2267 | flags |= RTCF_LOCAL; | |
2268 | ||
982721f3 | 2269 | if (type == RTN_BROADCAST) { |
1da177e4 | 2270 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2271 | fi = NULL; |
2272 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2273 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2274 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2275 | fl4->flowi4_proto)) | |
1da177e4 LT |
2276 | flags &= ~RTCF_LOCAL; |
2277 | /* If multicast route do not exist use | |
dd28d1a0 ED |
2278 | * default one, but do not gateway in this case. |
2279 | * Yes, it is hack. | |
1da177e4 | 2280 | */ |
982721f3 DM |
2281 | if (fi && res->prefixlen < 4) |
2282 | fi = NULL; | |
1da177e4 LT |
2283 | } |
2284 | ||
5c1e6aa3 DM |
2285 | rth = rt_dst_alloc(dev_out, |
2286 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
0c4dcd58 | 2287 | IN_DEV_CONF_GET(in_dev, NOXFRM)); |
8391d07b | 2288 | if (!rth) |
5ada5527 | 2289 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2290 | |
cf911662 DM |
2291 | rth->dst.output = ip_output; |
2292 | ||
813b3b5d DM |
2293 | rth->rt_key_dst = orig_daddr; |
2294 | rth->rt_key_src = orig_saddr; | |
cf911662 DM |
2295 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
2296 | rth->rt_flags = flags; | |
2297 | rth->rt_type = type; | |
f61759e6 | 2298 | rth->rt_key_tos = orig_rtos; |
68a5e3dd DM |
2299 | rth->rt_dst = fl4->daddr; |
2300 | rth->rt_src = fl4->saddr; | |
1b86a58f | 2301 | rth->rt_route_iif = 0; |
813b3b5d DM |
2302 | rth->rt_iif = orig_oif ? : dev_out->ifindex; |
2303 | rth->rt_oif = orig_oif; | |
2304 | rth->rt_mark = fl4->flowi4_mark; | |
5943634f | 2305 | rth->rt_pmtu = 0; |
68a5e3dd | 2306 | rth->rt_gateway = fl4->daddr; |
cf911662 | 2307 | rth->fi = NULL; |
1da177e4 LT |
2308 | |
2309 | RT_CACHE_STAT_INC(out_slow_tot); | |
2310 | ||
41347dcd | 2311 | if (flags & RTCF_LOCAL) |
d8d1f30b | 2312 | rth->dst.input = ip_local_deliver; |
1da177e4 | 2313 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2314 | if (flags & RTCF_LOCAL && |
1da177e4 | 2315 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2316 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2317 | RT_CACHE_STAT_INC(out_slow_mc); |
2318 | } | |
2319 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2320 | if (type == RTN_MULTICAST) { |
1da177e4 | 2321 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2322 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2323 | rth->dst.input = ip_mr_input; |
2324 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2325 | } |
2326 | } | |
2327 | #endif | |
2328 | } | |
2329 | ||
813b3b5d | 2330 | rt_set_nexthop(rth, fl4, res, fi, type, 0); |
1da177e4 | 2331 | |
7586eceb ED |
2332 | if (fl4->flowi4_flags & FLOWI_FLAG_RT_NOCACHE) |
2333 | rth->dst.flags |= DST_NOCACHE; | |
2334 | ||
5ada5527 | 2335 | return rth; |
1da177e4 LT |
2336 | } |
2337 | ||
1da177e4 LT |
2338 | /* |
2339 | * Major route resolver routine. | |
0197aa38 | 2340 | * called with rcu_read_lock(); |
1da177e4 LT |
2341 | */ |
2342 | ||
813b3b5d | 2343 | static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4) |
1da177e4 | 2344 | { |
1da177e4 | 2345 | struct net_device *dev_out = NULL; |
f61759e6 | 2346 | __u8 tos = RT_FL_TOS(fl4); |
813b3b5d DM |
2347 | unsigned int flags = 0; |
2348 | struct fib_result res; | |
5ada5527 | 2349 | struct rtable *rth; |
813b3b5d DM |
2350 | __be32 orig_daddr; |
2351 | __be32 orig_saddr; | |
2352 | int orig_oif; | |
1da177e4 LT |
2353 | |
2354 | res.fi = NULL; | |
8b96d22d | 2355 | res.table = NULL; |
1da177e4 LT |
2356 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
2357 | res.r = NULL; | |
2358 | #endif | |
2359 | ||
813b3b5d DM |
2360 | orig_daddr = fl4->daddr; |
2361 | orig_saddr = fl4->saddr; | |
2362 | orig_oif = fl4->flowi4_oif; | |
2363 | ||
2364 | fl4->flowi4_iif = net->loopback_dev->ifindex; | |
2365 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
2366 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2367 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2368 | |
010c2708 | 2369 | rcu_read_lock(); |
813b3b5d | 2370 | if (fl4->saddr) { |
b23dd4fe | 2371 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
2372 | if (ipv4_is_multicast(fl4->saddr) || |
2373 | ipv4_is_lbcast(fl4->saddr) || | |
2374 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
2375 | goto out; |
2376 | ||
1da177e4 LT |
2377 | /* I removed check for oif == dev_out->oif here. |
2378 | It was wrong for two reasons: | |
1ab35276 DL |
2379 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2380 | is assigned to multiple interfaces. | |
1da177e4 LT |
2381 | 2. Moreover, we are allowed to send packets with saddr |
2382 | of another iface. --ANK | |
2383 | */ | |
2384 | ||
813b3b5d DM |
2385 | if (fl4->flowi4_oif == 0 && |
2386 | (ipv4_is_multicast(fl4->daddr) || | |
2387 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2388 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2389 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
a210d01a JA |
2390 | if (dev_out == NULL) |
2391 | goto out; | |
2392 | ||
1da177e4 LT |
2393 | /* Special hack: user can direct multicasts |
2394 | and limited broadcast via necessary interface | |
2395 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2396 | This hack is not just for fun, it allows | |
2397 | vic,vat and friends to work. | |
2398 | They bind socket to loopback, set ttl to zero | |
2399 | and expect that it will work. | |
2400 | From the viewpoint of routing cache they are broken, | |
2401 | because we are not allowed to build multicast path | |
2402 | with loopback source addr (look, routing cache | |
2403 | cannot know, that ttl is zero, so that packet | |
2404 | will not leave this host and route is valid). | |
2405 | Luckily, this hack is good workaround. | |
2406 | */ | |
2407 | ||
813b3b5d | 2408 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2409 | goto make_route; |
2410 | } | |
a210d01a | 2411 | |
813b3b5d | 2412 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2413 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2414 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2415 | goto out; |
a210d01a | 2416 | } |
1da177e4 LT |
2417 | } |
2418 | ||
2419 | ||
813b3b5d DM |
2420 | if (fl4->flowi4_oif) { |
2421 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2422 | rth = ERR_PTR(-ENODEV); |
1da177e4 LT |
2423 | if (dev_out == NULL) |
2424 | goto out; | |
e5ed6399 HX |
2425 | |
2426 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2427 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2428 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2429 | goto out; |
2430 | } | |
813b3b5d DM |
2431 | if (ipv4_is_local_multicast(fl4->daddr) || |
2432 | ipv4_is_lbcast(fl4->daddr)) { | |
2433 | if (!fl4->saddr) | |
2434 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2435 | RT_SCOPE_LINK); | |
1da177e4 LT |
2436 | goto make_route; |
2437 | } | |
813b3b5d DM |
2438 | if (fl4->saddr) { |
2439 | if (ipv4_is_multicast(fl4->daddr)) | |
2440 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2441 | fl4->flowi4_scope); | |
2442 | else if (!fl4->daddr) | |
2443 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2444 | RT_SCOPE_HOST); | |
1da177e4 LT |
2445 | } |
2446 | } | |
2447 | ||
813b3b5d DM |
2448 | if (!fl4->daddr) { |
2449 | fl4->daddr = fl4->saddr; | |
2450 | if (!fl4->daddr) | |
2451 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2452 | dev_out = net->loopback_dev; |
813b3b5d | 2453 | fl4->flowi4_oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2454 | res.type = RTN_LOCAL; |
2455 | flags |= RTCF_LOCAL; | |
2456 | goto make_route; | |
2457 | } | |
2458 | ||
813b3b5d | 2459 | if (fib_lookup(net, fl4, &res)) { |
1da177e4 | 2460 | res.fi = NULL; |
8b96d22d | 2461 | res.table = NULL; |
813b3b5d | 2462 | if (fl4->flowi4_oif) { |
1da177e4 LT |
2463 | /* Apparently, routing tables are wrong. Assume, |
2464 | that the destination is on link. | |
2465 | ||
2466 | WHY? DW. | |
2467 | Because we are allowed to send to iface | |
2468 | even if it has NO routes and NO assigned | |
2469 | addresses. When oif is specified, routing | |
2470 | tables are looked up with only one purpose: | |
2471 | to catch if destination is gatewayed, rather than | |
2472 | direct. Moreover, if MSG_DONTROUTE is set, | |
2473 | we send packet, ignoring both routing tables | |
2474 | and ifaddr state. --ANK | |
2475 | ||
2476 | ||
2477 | We could make it even if oif is unknown, | |
2478 | likely IPv6, but we do not. | |
2479 | */ | |
2480 | ||
813b3b5d DM |
2481 | if (fl4->saddr == 0) |
2482 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2483 | RT_SCOPE_LINK); | |
1da177e4 LT |
2484 | res.type = RTN_UNICAST; |
2485 | goto make_route; | |
2486 | } | |
b23dd4fe | 2487 | rth = ERR_PTR(-ENETUNREACH); |
1da177e4 LT |
2488 | goto out; |
2489 | } | |
1da177e4 LT |
2490 | |
2491 | if (res.type == RTN_LOCAL) { | |
813b3b5d | 2492 | if (!fl4->saddr) { |
9fc3bbb4 | 2493 | if (res.fi->fib_prefsrc) |
813b3b5d | 2494 | fl4->saddr = res.fi->fib_prefsrc; |
9fc3bbb4 | 2495 | else |
813b3b5d | 2496 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2497 | } |
b40afd0e | 2498 | dev_out = net->loopback_dev; |
813b3b5d | 2499 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2500 | res.fi = NULL; |
2501 | flags |= RTCF_LOCAL; | |
2502 | goto make_route; | |
2503 | } | |
2504 | ||
2505 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
813b3b5d | 2506 | if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) |
1b7fe593 | 2507 | fib_select_multipath(&res); |
1da177e4 LT |
2508 | else |
2509 | #endif | |
21d8c49e DM |
2510 | if (!res.prefixlen && |
2511 | res.table->tb_num_default > 1 && | |
813b3b5d | 2512 | res.type == RTN_UNICAST && !fl4->flowi4_oif) |
0c838ff1 | 2513 | fib_select_default(&res); |
1da177e4 | 2514 | |
813b3b5d DM |
2515 | if (!fl4->saddr) |
2516 | fl4->saddr = FIB_RES_PREFSRC(net, res); | |
1da177e4 | 2517 | |
1da177e4 | 2518 | dev_out = FIB_RES_DEV(res); |
813b3b5d | 2519 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2520 | |
2521 | ||
2522 | make_route: | |
813b3b5d | 2523 | rth = __mkroute_output(&res, fl4, orig_daddr, orig_saddr, orig_oif, |
f61759e6 | 2524 | tos, dev_out, flags); |
b23dd4fe | 2525 | if (!IS_ERR(rth)) { |
5ada5527 DM |
2526 | unsigned int hash; |
2527 | ||
813b3b5d | 2528 | hash = rt_hash(orig_daddr, orig_saddr, orig_oif, |
5ada5527 | 2529 | rt_genid(dev_net(dev_out))); |
813b3b5d | 2530 | rth = rt_intern_hash(hash, rth, NULL, orig_oif); |
5ada5527 | 2531 | } |
1da177e4 | 2532 | |
010c2708 DM |
2533 | out: |
2534 | rcu_read_unlock(); | |
b23dd4fe | 2535 | return rth; |
1da177e4 LT |
2536 | } |
2537 | ||
813b3b5d | 2538 | struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4) |
1da177e4 | 2539 | { |
1da177e4 | 2540 | struct rtable *rth; |
010c2708 | 2541 | unsigned int hash; |
1da177e4 | 2542 | |
1080d709 NH |
2543 | if (!rt_caching(net)) |
2544 | goto slow_output; | |
2545 | ||
9d6ec938 | 2546 | hash = rt_hash(flp4->daddr, flp4->saddr, flp4->flowi4_oif, rt_genid(net)); |
1da177e4 LT |
2547 | |
2548 | rcu_read_lock_bh(); | |
a898def2 | 2549 | for (rth = rcu_dereference_bh(rt_hash_table[hash].chain); rth; |
d8d1f30b | 2550 | rth = rcu_dereference_bh(rth->dst.rt_next)) { |
9d6ec938 DM |
2551 | if (rth->rt_key_dst == flp4->daddr && |
2552 | rth->rt_key_src == flp4->saddr && | |
c7537967 | 2553 | rt_is_output_route(rth) && |
9d6ec938 DM |
2554 | rth->rt_oif == flp4->flowi4_oif && |
2555 | rth->rt_mark == flp4->flowi4_mark && | |
475949d8 | 2556 | !((rth->rt_key_tos ^ flp4->flowi4_tos) & |
b5921910 | 2557 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
d8d1f30b | 2558 | net_eq(dev_net(rth->dst.dev), net) && |
e84f84f2 | 2559 | !rt_is_expired(rth)) { |
d8d1f30b | 2560 | dst_use(&rth->dst, jiffies); |
1da177e4 LT |
2561 | RT_CACHE_STAT_INC(out_hit); |
2562 | rcu_read_unlock_bh(); | |
56157872 DM |
2563 | if (!flp4->saddr) |
2564 | flp4->saddr = rth->rt_src; | |
2565 | if (!flp4->daddr) | |
2566 | flp4->daddr = rth->rt_dst; | |
b23dd4fe | 2567 | return rth; |
1da177e4 LT |
2568 | } |
2569 | RT_CACHE_STAT_INC(out_hlist_search); | |
2570 | } | |
2571 | rcu_read_unlock_bh(); | |
2572 | ||
1080d709 | 2573 | slow_output: |
9d6ec938 | 2574 | return ip_route_output_slow(net, flp4); |
1da177e4 | 2575 | } |
d8c97a94 ACM |
2576 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2577 | ||
ae2688d5 JW |
2578 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2579 | { | |
2580 | return NULL; | |
2581 | } | |
2582 | ||
ebb762f2 | 2583 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2584 | { |
618f9bc7 SK |
2585 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2586 | ||
2587 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2588 | } |
2589 | ||
14e50e57 DM |
2590 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2591 | { | |
2592 | } | |
2593 | ||
0972ddb2 HB |
2594 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2595 | unsigned long old) | |
2596 | { | |
2597 | return NULL; | |
2598 | } | |
2599 | ||
14e50e57 DM |
2600 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2601 | .family = AF_INET, | |
09640e63 | 2602 | .protocol = cpu_to_be16(ETH_P_IP), |
14e50e57 | 2603 | .destroy = ipv4_dst_destroy, |
ae2688d5 | 2604 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2605 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2606 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2607 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
0972ddb2 | 2608 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2609 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2610 | }; |
2611 | ||
2774c131 | 2612 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2613 | { |
5c1e6aa3 | 2614 | struct rtable *rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, 0, 0); |
2774c131 | 2615 | struct rtable *ort = (struct rtable *) dst_orig; |
14e50e57 DM |
2616 | |
2617 | if (rt) { | |
d8d1f30b | 2618 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2619 | |
14e50e57 | 2620 | new->__use = 1; |
352e512c HX |
2621 | new->input = dst_discard; |
2622 | new->output = dst_discard; | |
14e50e57 | 2623 | |
d8d1f30b | 2624 | new->dev = ort->dst.dev; |
14e50e57 DM |
2625 | if (new->dev) |
2626 | dev_hold(new->dev); | |
2627 | ||
5e2b61f7 DM |
2628 | rt->rt_key_dst = ort->rt_key_dst; |
2629 | rt->rt_key_src = ort->rt_key_src; | |
475949d8 | 2630 | rt->rt_key_tos = ort->rt_key_tos; |
1b86a58f | 2631 | rt->rt_route_iif = ort->rt_route_iif; |
5e2b61f7 DM |
2632 | rt->rt_iif = ort->rt_iif; |
2633 | rt->rt_oif = ort->rt_oif; | |
2634 | rt->rt_mark = ort->rt_mark; | |
5943634f | 2635 | rt->rt_pmtu = ort->rt_pmtu; |
14e50e57 | 2636 | |
e84f84f2 | 2637 | rt->rt_genid = rt_genid(net); |
14e50e57 DM |
2638 | rt->rt_flags = ort->rt_flags; |
2639 | rt->rt_type = ort->rt_type; | |
2640 | rt->rt_dst = ort->rt_dst; | |
2641 | rt->rt_src = ort->rt_src; | |
14e50e57 | 2642 | rt->rt_gateway = ort->rt_gateway; |
62fa8a84 DM |
2643 | rt->fi = ort->fi; |
2644 | if (rt->fi) | |
2645 | atomic_inc(&rt->fi->fib_clntref); | |
14e50e57 DM |
2646 | |
2647 | dst_free(new); | |
2648 | } | |
2649 | ||
2774c131 DM |
2650 | dst_release(dst_orig); |
2651 | ||
2652 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2653 | } |
2654 | ||
9d6ec938 | 2655 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
b23dd4fe | 2656 | struct sock *sk) |
1da177e4 | 2657 | { |
9d6ec938 | 2658 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2659 | |
b23dd4fe DM |
2660 | if (IS_ERR(rt)) |
2661 | return rt; | |
1da177e4 | 2662 | |
56157872 | 2663 | if (flp4->flowi4_proto) |
9d6ec938 DM |
2664 | rt = (struct rtable *) xfrm_lookup(net, &rt->dst, |
2665 | flowi4_to_flowi(flp4), | |
2666 | sk, 0); | |
1da177e4 | 2667 | |
b23dd4fe | 2668 | return rt; |
1da177e4 | 2669 | } |
d8c97a94 ACM |
2670 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2671 | ||
4feb88e5 BT |
2672 | static int rt_fill_info(struct net *net, |
2673 | struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2674 | int nowait, unsigned int flags) |
1da177e4 | 2675 | { |
511c3f92 | 2676 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 2677 | struct rtmsg *r; |
be403ea1 | 2678 | struct nlmsghdr *nlh; |
2bc8ca40 | 2679 | unsigned long expires = 0; |
f185071d | 2680 | u32 error; |
be403ea1 TG |
2681 | |
2682 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2683 | if (nlh == NULL) | |
26932566 | 2684 | return -EMSGSIZE; |
be403ea1 TG |
2685 | |
2686 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2687 | r->rtm_family = AF_INET; |
2688 | r->rtm_dst_len = 32; | |
2689 | r->rtm_src_len = 0; | |
475949d8 | 2690 | r->rtm_tos = rt->rt_key_tos; |
1da177e4 | 2691 | r->rtm_table = RT_TABLE_MAIN; |
f3756b79 DM |
2692 | if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN)) |
2693 | goto nla_put_failure; | |
1da177e4 LT |
2694 | r->rtm_type = rt->rt_type; |
2695 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2696 | r->rtm_protocol = RTPROT_UNSPEC; | |
2697 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2698 | if (rt->rt_flags & RTCF_NOTIFY) | |
2699 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2700 | |
f3756b79 DM |
2701 | if (nla_put_be32(skb, RTA_DST, rt->rt_dst)) |
2702 | goto nla_put_failure; | |
5e2b61f7 | 2703 | if (rt->rt_key_src) { |
1da177e4 | 2704 | r->rtm_src_len = 32; |
f3756b79 DM |
2705 | if (nla_put_be32(skb, RTA_SRC, rt->rt_key_src)) |
2706 | goto nla_put_failure; | |
1da177e4 | 2707 | } |
f3756b79 DM |
2708 | if (rt->dst.dev && |
2709 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2710 | goto nla_put_failure; | |
c7066f70 | 2711 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2712 | if (rt->dst.tclassid && |
2713 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2714 | goto nla_put_failure; | |
1da177e4 | 2715 | #endif |
41347dcd DM |
2716 | if (!rt_is_input_route(rt) && |
2717 | rt->rt_src != rt->rt_key_src) { | |
f3756b79 DM |
2718 | if (nla_put_be32(skb, RTA_PREFSRC, rt->rt_src)) |
2719 | goto nla_put_failure; | |
2720 | } | |
2721 | if (rt->rt_dst != rt->rt_gateway && | |
2722 | nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway)) | |
2723 | goto nla_put_failure; | |
be403ea1 | 2724 | |
defb3519 | 2725 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
be403ea1 TG |
2726 | goto nla_put_failure; |
2727 | ||
f3756b79 DM |
2728 | if (rt->rt_mark && |
2729 | nla_put_be32(skb, RTA_MARK, rt->rt_mark)) | |
2730 | goto nla_put_failure; | |
963bfeee | 2731 | |
d8d1f30b | 2732 | error = rt->dst.error; |
5943634f DM |
2733 | expires = rt->dst.expires; |
2734 | if (expires) { | |
2735 | if (time_before(jiffies, expires)) | |
2736 | expires -= jiffies; | |
2737 | else | |
2738 | expires = 0; | |
1da177e4 | 2739 | } |
be403ea1 | 2740 | |
c7537967 | 2741 | if (rt_is_input_route(rt)) { |
1da177e4 | 2742 | #ifdef CONFIG_IP_MROUTE |
e448515c | 2743 | __be32 dst = rt->rt_dst; |
1da177e4 | 2744 | |
f97c1e0c | 2745 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
4feb88e5 | 2746 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { |
9a1b9496 DM |
2747 | int err = ipmr_get_route(net, skb, |
2748 | rt->rt_src, rt->rt_dst, | |
2749 | r, nowait); | |
1da177e4 LT |
2750 | if (err <= 0) { |
2751 | if (!nowait) { | |
2752 | if (err == 0) | |
2753 | return 0; | |
be403ea1 | 2754 | goto nla_put_failure; |
1da177e4 LT |
2755 | } else { |
2756 | if (err == -EMSGSIZE) | |
be403ea1 | 2757 | goto nla_put_failure; |
e3703b3d | 2758 | error = err; |
1da177e4 LT |
2759 | } |
2760 | } | |
2761 | } else | |
2762 | #endif | |
f3756b79 DM |
2763 | if (nla_put_u32(skb, RTA_IIF, rt->rt_iif)) |
2764 | goto nla_put_failure; | |
1da177e4 LT |
2765 | } |
2766 | ||
f185071d | 2767 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2768 | goto nla_put_failure; |
be403ea1 TG |
2769 | |
2770 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2771 | |
be403ea1 | 2772 | nla_put_failure: |
26932566 PM |
2773 | nlmsg_cancel(skb, nlh); |
2774 | return -EMSGSIZE; | |
1da177e4 LT |
2775 | } |
2776 | ||
5e73ea1a | 2777 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 2778 | { |
3b1e0a65 | 2779 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2780 | struct rtmsg *rtm; |
2781 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2782 | struct rtable *rt = NULL; |
9e12bb22 AV |
2783 | __be32 dst = 0; |
2784 | __be32 src = 0; | |
2785 | u32 iif; | |
d889ce3b | 2786 | int err; |
963bfeee | 2787 | int mark; |
1da177e4 LT |
2788 | struct sk_buff *skb; |
2789 | ||
d889ce3b TG |
2790 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2791 | if (err < 0) | |
2792 | goto errout; | |
2793 | ||
2794 | rtm = nlmsg_data(nlh); | |
2795 | ||
1da177e4 | 2796 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2797 | if (skb == NULL) { |
2798 | err = -ENOBUFS; | |
2799 | goto errout; | |
2800 | } | |
1da177e4 LT |
2801 | |
2802 | /* Reserve room for dummy headers, this skb can pass | |
2803 | through good chunk of routing engine. | |
2804 | */ | |
459a98ed | 2805 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2806 | skb_reset_network_header(skb); |
d2c962b8 SH |
2807 | |
2808 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2809 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2810 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2811 | ||
17fb2c64 AV |
2812 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2813 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2814 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 2815 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
1da177e4 LT |
2816 | |
2817 | if (iif) { | |
d889ce3b TG |
2818 | struct net_device *dev; |
2819 | ||
1937504d | 2820 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2821 | if (dev == NULL) { |
2822 | err = -ENODEV; | |
2823 | goto errout_free; | |
2824 | } | |
2825 | ||
1da177e4 LT |
2826 | skb->protocol = htons(ETH_P_IP); |
2827 | skb->dev = dev; | |
963bfeee | 2828 | skb->mark = mark; |
1da177e4 LT |
2829 | local_bh_disable(); |
2830 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2831 | local_bh_enable(); | |
d889ce3b | 2832 | |
511c3f92 | 2833 | rt = skb_rtable(skb); |
d8d1f30b CG |
2834 | if (err == 0 && rt->dst.error) |
2835 | err = -rt->dst.error; | |
1da177e4 | 2836 | } else { |
68a5e3dd DM |
2837 | struct flowi4 fl4 = { |
2838 | .daddr = dst, | |
2839 | .saddr = src, | |
2840 | .flowi4_tos = rtm->rtm_tos, | |
2841 | .flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2842 | .flowi4_mark = mark, | |
d889ce3b | 2843 | }; |
9d6ec938 | 2844 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe DM |
2845 | |
2846 | err = 0; | |
2847 | if (IS_ERR(rt)) | |
2848 | err = PTR_ERR(rt); | |
1da177e4 | 2849 | } |
d889ce3b | 2850 | |
1da177e4 | 2851 | if (err) |
d889ce3b | 2852 | goto errout_free; |
1da177e4 | 2853 | |
d8d1f30b | 2854 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
2855 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2856 | rt->rt_flags |= RTCF_NOTIFY; | |
2857 | ||
4feb88e5 | 2858 | err = rt_fill_info(net, skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2859 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2860 | if (err <= 0) |
2861 | goto errout_free; | |
1da177e4 | 2862 | |
1937504d | 2863 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2864 | errout: |
2942e900 | 2865 | return err; |
1da177e4 | 2866 | |
d889ce3b | 2867 | errout_free: |
1da177e4 | 2868 | kfree_skb(skb); |
d889ce3b | 2869 | goto errout; |
1da177e4 LT |
2870 | } |
2871 | ||
2872 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2873 | { | |
2874 | struct rtable *rt; | |
2875 | int h, s_h; | |
2876 | int idx, s_idx; | |
1937504d DL |
2877 | struct net *net; |
2878 | ||
3b1e0a65 | 2879 | net = sock_net(skb->sk); |
1da177e4 LT |
2880 | |
2881 | s_h = cb->args[0]; | |
d8c92830 ED |
2882 | if (s_h < 0) |
2883 | s_h = 0; | |
1da177e4 | 2884 | s_idx = idx = cb->args[1]; |
a6272665 ED |
2885 | for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) { |
2886 | if (!rt_hash_table[h].chain) | |
2887 | continue; | |
1da177e4 | 2888 | rcu_read_lock_bh(); |
a898def2 | 2889 | for (rt = rcu_dereference_bh(rt_hash_table[h].chain), idx = 0; rt; |
d8d1f30b CG |
2890 | rt = rcu_dereference_bh(rt->dst.rt_next), idx++) { |
2891 | if (!net_eq(dev_net(rt->dst.dev), net) || idx < s_idx) | |
1da177e4 | 2892 | continue; |
e84f84f2 | 2893 | if (rt_is_expired(rt)) |
29e75252 | 2894 | continue; |
d8d1f30b | 2895 | skb_dst_set_noref(skb, &rt->dst); |
4feb88e5 | 2896 | if (rt_fill_info(net, skb, NETLINK_CB(cb->skb).pid, |
e905a9ed | 2897 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2898 | 1, NLM_F_MULTI) <= 0) { |
adf30907 | 2899 | skb_dst_drop(skb); |
1da177e4 LT |
2900 | rcu_read_unlock_bh(); |
2901 | goto done; | |
2902 | } | |
adf30907 | 2903 | skb_dst_drop(skb); |
1da177e4 LT |
2904 | } |
2905 | rcu_read_unlock_bh(); | |
2906 | } | |
2907 | ||
2908 | done: | |
2909 | cb->args[0] = h; | |
2910 | cb->args[1] = idx; | |
2911 | return skb->len; | |
2912 | } | |
2913 | ||
2914 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2915 | { | |
76e6ebfb | 2916 | rt_cache_flush(dev_net(in_dev->dev), 0); |
1da177e4 LT |
2917 | } |
2918 | ||
2919 | #ifdef CONFIG_SYSCTL | |
81c684d1 | 2920 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
8d65af78 | 2921 | void __user *buffer, |
1da177e4 LT |
2922 | size_t *lenp, loff_t *ppos) |
2923 | { | |
2924 | if (write) { | |
639e104f | 2925 | int flush_delay; |
81c684d1 | 2926 | ctl_table ctl; |
39a23e75 | 2927 | struct net *net; |
639e104f | 2928 | |
81c684d1 DL |
2929 | memcpy(&ctl, __ctl, sizeof(ctl)); |
2930 | ctl.data = &flush_delay; | |
8d65af78 | 2931 | proc_dointvec(&ctl, write, buffer, lenp, ppos); |
639e104f | 2932 | |
81c684d1 | 2933 | net = (struct net *)__ctl->extra1; |
39a23e75 | 2934 | rt_cache_flush(net, flush_delay); |
1da177e4 | 2935 | return 0; |
e905a9ed | 2936 | } |
1da177e4 LT |
2937 | |
2938 | return -EINVAL; | |
2939 | } | |
2940 | ||
eeb61f71 | 2941 | static ctl_table ipv4_route_table[] = { |
1da177e4 | 2942 | { |
1da177e4 LT |
2943 | .procname = "gc_thresh", |
2944 | .data = &ipv4_dst_ops.gc_thresh, | |
2945 | .maxlen = sizeof(int), | |
2946 | .mode = 0644, | |
6d9f239a | 2947 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2948 | }, |
2949 | { | |
1da177e4 LT |
2950 | .procname = "max_size", |
2951 | .data = &ip_rt_max_size, | |
2952 | .maxlen = sizeof(int), | |
2953 | .mode = 0644, | |
6d9f239a | 2954 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2955 | }, |
2956 | { | |
2957 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2958 | |
1da177e4 LT |
2959 | .procname = "gc_min_interval", |
2960 | .data = &ip_rt_gc_min_interval, | |
2961 | .maxlen = sizeof(int), | |
2962 | .mode = 0644, | |
6d9f239a | 2963 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2964 | }, |
2965 | { | |
1da177e4 LT |
2966 | .procname = "gc_min_interval_ms", |
2967 | .data = &ip_rt_gc_min_interval, | |
2968 | .maxlen = sizeof(int), | |
2969 | .mode = 0644, | |
6d9f239a | 2970 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
2971 | }, |
2972 | { | |
1da177e4 LT |
2973 | .procname = "gc_timeout", |
2974 | .data = &ip_rt_gc_timeout, | |
2975 | .maxlen = sizeof(int), | |
2976 | .mode = 0644, | |
6d9f239a | 2977 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 2978 | }, |
9f28a2fc ED |
2979 | { |
2980 | .procname = "gc_interval", | |
2981 | .data = &ip_rt_gc_interval, | |
2982 | .maxlen = sizeof(int), | |
2983 | .mode = 0644, | |
2984 | .proc_handler = proc_dointvec_jiffies, | |
2985 | }, | |
1da177e4 | 2986 | { |
1da177e4 LT |
2987 | .procname = "redirect_load", |
2988 | .data = &ip_rt_redirect_load, | |
2989 | .maxlen = sizeof(int), | |
2990 | .mode = 0644, | |
6d9f239a | 2991 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2992 | }, |
2993 | { | |
1da177e4 LT |
2994 | .procname = "redirect_number", |
2995 | .data = &ip_rt_redirect_number, | |
2996 | .maxlen = sizeof(int), | |
2997 | .mode = 0644, | |
6d9f239a | 2998 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2999 | }, |
3000 | { | |
1da177e4 LT |
3001 | .procname = "redirect_silence", |
3002 | .data = &ip_rt_redirect_silence, | |
3003 | .maxlen = sizeof(int), | |
3004 | .mode = 0644, | |
6d9f239a | 3005 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3006 | }, |
3007 | { | |
1da177e4 LT |
3008 | .procname = "error_cost", |
3009 | .data = &ip_rt_error_cost, | |
3010 | .maxlen = sizeof(int), | |
3011 | .mode = 0644, | |
6d9f239a | 3012 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3013 | }, |
3014 | { | |
1da177e4 LT |
3015 | .procname = "error_burst", |
3016 | .data = &ip_rt_error_burst, | |
3017 | .maxlen = sizeof(int), | |
3018 | .mode = 0644, | |
6d9f239a | 3019 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3020 | }, |
3021 | { | |
1da177e4 LT |
3022 | .procname = "gc_elasticity", |
3023 | .data = &ip_rt_gc_elasticity, | |
3024 | .maxlen = sizeof(int), | |
3025 | .mode = 0644, | |
6d9f239a | 3026 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3027 | }, |
3028 | { | |
1da177e4 LT |
3029 | .procname = "mtu_expires", |
3030 | .data = &ip_rt_mtu_expires, | |
3031 | .maxlen = sizeof(int), | |
3032 | .mode = 0644, | |
6d9f239a | 3033 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3034 | }, |
3035 | { | |
1da177e4 LT |
3036 | .procname = "min_pmtu", |
3037 | .data = &ip_rt_min_pmtu, | |
3038 | .maxlen = sizeof(int), | |
3039 | .mode = 0644, | |
6d9f239a | 3040 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3041 | }, |
3042 | { | |
1da177e4 LT |
3043 | .procname = "min_adv_mss", |
3044 | .data = &ip_rt_min_advmss, | |
3045 | .maxlen = sizeof(int), | |
3046 | .mode = 0644, | |
6d9f239a | 3047 | .proc_handler = proc_dointvec, |
1da177e4 | 3048 | }, |
f8572d8f | 3049 | { } |
1da177e4 | 3050 | }; |
39a23e75 | 3051 | |
39a23e75 DL |
3052 | static struct ctl_table ipv4_route_flush_table[] = { |
3053 | { | |
39a23e75 DL |
3054 | .procname = "flush", |
3055 | .maxlen = sizeof(int), | |
3056 | .mode = 0200, | |
6d9f239a | 3057 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 3058 | }, |
f8572d8f | 3059 | { }, |
39a23e75 DL |
3060 | }; |
3061 | ||
3062 | static __net_init int sysctl_route_net_init(struct net *net) | |
3063 | { | |
3064 | struct ctl_table *tbl; | |
3065 | ||
3066 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 3067 | if (!net_eq(net, &init_net)) { |
39a23e75 DL |
3068 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
3069 | if (tbl == NULL) | |
3070 | goto err_dup; | |
3071 | } | |
3072 | tbl[0].extra1 = net; | |
3073 | ||
ec8f23ce | 3074 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
39a23e75 DL |
3075 | if (net->ipv4.route_hdr == NULL) |
3076 | goto err_reg; | |
3077 | return 0; | |
3078 | ||
3079 | err_reg: | |
3080 | if (tbl != ipv4_route_flush_table) | |
3081 | kfree(tbl); | |
3082 | err_dup: | |
3083 | return -ENOMEM; | |
3084 | } | |
3085 | ||
3086 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3087 | { | |
3088 | struct ctl_table *tbl; | |
3089 | ||
3090 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3091 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3092 | BUG_ON(tbl == ipv4_route_flush_table); | |
3093 | kfree(tbl); | |
3094 | } | |
3095 | ||
3096 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3097 | .init = sysctl_route_net_init, | |
3098 | .exit = sysctl_route_net_exit, | |
3099 | }; | |
1da177e4 LT |
3100 | #endif |
3101 | ||
3ee94372 | 3102 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 3103 | { |
3ee94372 NH |
3104 | get_random_bytes(&net->ipv4.rt_genid, |
3105 | sizeof(net->ipv4.rt_genid)); | |
436c3b66 DM |
3106 | get_random_bytes(&net->ipv4.dev_addr_genid, |
3107 | sizeof(net->ipv4.dev_addr_genid)); | |
9f5e97e5 DL |
3108 | return 0; |
3109 | } | |
3110 | ||
3ee94372 NH |
3111 | static __net_initdata struct pernet_operations rt_genid_ops = { |
3112 | .init = rt_genid_init, | |
9f5e97e5 DL |
3113 | }; |
3114 | ||
c3426b47 DM |
3115 | static int __net_init ipv4_inetpeer_init(struct net *net) |
3116 | { | |
3117 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3118 | ||
3119 | if (!bp) | |
3120 | return -ENOMEM; | |
3121 | inet_peer_base_init(bp); | |
3122 | net->ipv4.peers = bp; | |
3123 | return 0; | |
3124 | } | |
3125 | ||
3126 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
3127 | { | |
3128 | struct inet_peer_base *bp = net->ipv4.peers; | |
3129 | ||
3130 | net->ipv4.peers = NULL; | |
56a6b248 | 3131 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3132 | kfree(bp); |
3133 | } | |
3134 | ||
3135 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
3136 | .init = ipv4_inetpeer_init, | |
3137 | .exit = ipv4_inetpeer_exit, | |
3138 | }; | |
9f5e97e5 | 3139 | |
c7066f70 | 3140 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3141 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3142 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 LT |
3143 | |
3144 | static __initdata unsigned long rhash_entries; | |
3145 | static int __init set_rhash_entries(char *str) | |
3146 | { | |
413c27d8 EZ |
3147 | ssize_t ret; |
3148 | ||
1da177e4 LT |
3149 | if (!str) |
3150 | return 0; | |
413c27d8 EZ |
3151 | |
3152 | ret = kstrtoul(str, 0, &rhash_entries); | |
3153 | if (ret) | |
3154 | return 0; | |
3155 | ||
1da177e4 LT |
3156 | return 1; |
3157 | } | |
3158 | __setup("rhash_entries=", set_rhash_entries); | |
3159 | ||
3160 | int __init ip_rt_init(void) | |
3161 | { | |
424c4b70 | 3162 | int rc = 0; |
1da177e4 | 3163 | |
c7066f70 | 3164 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3165 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3166 | if (!ip_rt_acct) |
3167 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3168 | #endif |
3169 | ||
e5d679f3 AD |
3170 | ipv4_dst_ops.kmem_cachep = |
3171 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3172 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3173 | |
14e50e57 DM |
3174 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3175 | ||
fc66f95c ED |
3176 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3177 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3178 | ||
3179 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3180 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3181 | ||
424c4b70 ED |
3182 | rt_hash_table = (struct rt_hash_bucket *) |
3183 | alloc_large_system_hash("IP route cache", | |
3184 | sizeof(struct rt_hash_bucket), | |
3185 | rhash_entries, | |
4481374c | 3186 | (totalram_pages >= 128 * 1024) ? |
18955cfc | 3187 | 15 : 17, |
8d1502de | 3188 | 0, |
424c4b70 ED |
3189 | &rt_hash_log, |
3190 | &rt_hash_mask, | |
31fe62b9 | 3191 | 0, |
c9503e0f | 3192 | rhash_entries ? 0 : 512 * 1024); |
22c047cc ED |
3193 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3194 | rt_hash_lock_init(); | |
1da177e4 LT |
3195 | |
3196 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3197 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3198 | ||
1da177e4 LT |
3199 | devinet_init(); |
3200 | ip_fib_init(); | |
3201 | ||
9f28a2fc ED |
3202 | INIT_DELAYED_WORK_DEFERRABLE(&expires_work, rt_worker_func); |
3203 | expires_ljiffies = jiffies; | |
3204 | schedule_delayed_work(&expires_work, | |
3205 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
3206 | ||
73b38711 | 3207 | if (ip_rt_proc_init()) |
058bd4d2 | 3208 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
3209 | #ifdef CONFIG_XFRM |
3210 | xfrm_init(); | |
a33bc5c1 | 3211 | xfrm4_init(ip_rt_max_size); |
1da177e4 | 3212 | #endif |
c7ac8679 | 3213 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
63f3444f | 3214 | |
39a23e75 DL |
3215 | #ifdef CONFIG_SYSCTL |
3216 | register_pernet_subsys(&sysctl_route_ops); | |
3217 | #endif | |
3ee94372 | 3218 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 3219 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1da177e4 LT |
3220 | return rc; |
3221 | } | |
3222 | ||
a1bc6eb4 | 3223 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3224 | /* |
3225 | * We really need to sanitize the damn ipv4 init order, then all | |
3226 | * this nonsense will go away. | |
3227 | */ | |
3228 | void __init ip_static_sysctl_init(void) | |
3229 | { | |
4e5ca785 | 3230 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 3231 | } |
a1bc6eb4 | 3232 | #endif |