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 | ||
1da177e4 LT |
65 | #include <linux/module.h> |
66 | #include <asm/uaccess.h> | |
67 | #include <asm/system.h> | |
68 | #include <linux/bitops.h> | |
69 | #include <linux/types.h> | |
70 | #include <linux/kernel.h> | |
1da177e4 | 71 | #include <linux/mm.h> |
424c4b70 | 72 | #include <linux/bootmem.h> |
1da177e4 LT |
73 | #include <linux/string.h> |
74 | #include <linux/socket.h> | |
75 | #include <linux/sockios.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/in.h> | |
78 | #include <linux/inet.h> | |
79 | #include <linux/netdevice.h> | |
80 | #include <linux/proc_fs.h> | |
81 | #include <linux/init.h> | |
39c90ece | 82 | #include <linux/workqueue.h> |
1da177e4 | 83 | #include <linux/skbuff.h> |
1da177e4 LT |
84 | #include <linux/inetdevice.h> |
85 | #include <linux/igmp.h> | |
86 | #include <linux/pkt_sched.h> | |
87 | #include <linux/mroute.h> | |
88 | #include <linux/netfilter_ipv4.h> | |
89 | #include <linux/random.h> | |
90 | #include <linux/jhash.h> | |
91 | #include <linux/rcupdate.h> | |
92 | #include <linux/times.h> | |
352e512c | 93 | #include <net/dst.h> |
457c4cbc | 94 | #include <net/net_namespace.h> |
1da177e4 LT |
95 | #include <net/protocol.h> |
96 | #include <net/ip.h> | |
97 | #include <net/route.h> | |
98 | #include <net/inetpeer.h> | |
99 | #include <net/sock.h> | |
100 | #include <net/ip_fib.h> | |
101 | #include <net/arp.h> | |
102 | #include <net/tcp.h> | |
103 | #include <net/icmp.h> | |
104 | #include <net/xfrm.h> | |
8d71740c | 105 | #include <net/netevent.h> |
63f3444f | 106 | #include <net/rtnetlink.h> |
1da177e4 LT |
107 | #ifdef CONFIG_SYSCTL |
108 | #include <linux/sysctl.h> | |
109 | #endif | |
110 | ||
111 | #define RT_FL_TOS(oldflp) \ | |
112 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) | |
113 | ||
114 | #define IP_MAX_MTU 0xFFF0 | |
115 | ||
116 | #define RT_GC_TIMEOUT (300*HZ) | |
117 | ||
1da177e4 | 118 | static int ip_rt_max_size; |
817bc4db SH |
119 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
120 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; | |
121 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
122 | static int ip_rt_redirect_number __read_mostly = 9; | |
123 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
124 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
125 | static int ip_rt_error_cost __read_mostly = HZ; | |
126 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
127 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
128 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; | |
129 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
130 | static int ip_rt_min_advmss __read_mostly = 256; | |
131 | static int ip_rt_secret_interval __read_mostly = 10 * 60 * HZ; | |
1080d709 | 132 | static int rt_chain_length_max __read_mostly = 20; |
1da177e4 | 133 | |
beb659bd ED |
134 | static void rt_worker_func(struct work_struct *work); |
135 | static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); | |
1da177e4 LT |
136 | |
137 | /* | |
138 | * Interface to generic destination cache. | |
139 | */ | |
140 | ||
141 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
142 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
143 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
144 | struct net_device *dev, int how); | |
145 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
146 | static void ipv4_link_failure(struct sk_buff *skb); | |
147 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
569d3645 | 148 | static int rt_garbage_collect(struct dst_ops *ops); |
1080d709 | 149 | static void rt_emergency_hash_rebuild(struct net *net); |
1da177e4 LT |
150 | |
151 | ||
152 | static struct dst_ops ipv4_dst_ops = { | |
153 | .family = AF_INET, | |
154 | .protocol = __constant_htons(ETH_P_IP), | |
155 | .gc = rt_garbage_collect, | |
156 | .check = ipv4_dst_check, | |
157 | .destroy = ipv4_dst_destroy, | |
158 | .ifdown = ipv4_dst_ifdown, | |
159 | .negative_advice = ipv4_negative_advice, | |
160 | .link_failure = ipv4_link_failure, | |
161 | .update_pmtu = ip_rt_update_pmtu, | |
1ac06e03 | 162 | .local_out = __ip_local_out, |
e2422970 | 163 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
164 | }; |
165 | ||
166 | #define ECN_OR_COST(class) TC_PRIO_##class | |
167 | ||
4839c52b | 168 | const __u8 ip_tos2prio[16] = { |
1da177e4 LT |
169 | TC_PRIO_BESTEFFORT, |
170 | ECN_OR_COST(FILLER), | |
171 | TC_PRIO_BESTEFFORT, | |
172 | ECN_OR_COST(BESTEFFORT), | |
173 | TC_PRIO_BULK, | |
174 | ECN_OR_COST(BULK), | |
175 | TC_PRIO_BULK, | |
176 | ECN_OR_COST(BULK), | |
177 | TC_PRIO_INTERACTIVE, | |
178 | ECN_OR_COST(INTERACTIVE), | |
179 | TC_PRIO_INTERACTIVE, | |
180 | ECN_OR_COST(INTERACTIVE), | |
181 | TC_PRIO_INTERACTIVE_BULK, | |
182 | ECN_OR_COST(INTERACTIVE_BULK), | |
183 | TC_PRIO_INTERACTIVE_BULK, | |
184 | ECN_OR_COST(INTERACTIVE_BULK) | |
185 | }; | |
186 | ||
187 | ||
188 | /* | |
189 | * Route cache. | |
190 | */ | |
191 | ||
192 | /* The locking scheme is rather straight forward: | |
193 | * | |
194 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
195 | * 2) Only writers remove entries, and they hold the lock | |
196 | * as they look at rtable reference counts. | |
197 | * 3) Only readers acquire references to rtable entries, | |
198 | * they do so with atomic increments and with the | |
199 | * lock held. | |
200 | */ | |
201 | ||
202 | struct rt_hash_bucket { | |
203 | struct rtable *chain; | |
22c047cc | 204 | }; |
1080d709 | 205 | |
8a25d5de IM |
206 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
207 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
208 | /* |
209 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
210 | * The size of this table is a power of two and depends on the number of CPUS. | |
62051200 | 211 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 212 | */ |
62051200 IM |
213 | #ifdef CONFIG_LOCKDEP |
214 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 215 | #else |
62051200 IM |
216 | # if NR_CPUS >= 32 |
217 | # define RT_HASH_LOCK_SZ 4096 | |
218 | # elif NR_CPUS >= 16 | |
219 | # define RT_HASH_LOCK_SZ 2048 | |
220 | # elif NR_CPUS >= 8 | |
221 | # define RT_HASH_LOCK_SZ 1024 | |
222 | # elif NR_CPUS >= 4 | |
223 | # define RT_HASH_LOCK_SZ 512 | |
224 | # else | |
225 | # define RT_HASH_LOCK_SZ 256 | |
226 | # endif | |
22c047cc ED |
227 | #endif |
228 | ||
229 | static spinlock_t *rt_hash_locks; | |
230 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
1ff1cc20 PE |
231 | |
232 | static __init void rt_hash_lock_init(void) | |
233 | { | |
234 | int i; | |
235 | ||
236 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, | |
237 | GFP_KERNEL); | |
238 | if (!rt_hash_locks) | |
239 | panic("IP: failed to allocate rt_hash_locks\n"); | |
240 | ||
241 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) | |
242 | spin_lock_init(&rt_hash_locks[i]); | |
243 | } | |
22c047cc ED |
244 | #else |
245 | # define rt_hash_lock_addr(slot) NULL | |
1ff1cc20 PE |
246 | |
247 | static inline void rt_hash_lock_init(void) | |
248 | { | |
249 | } | |
22c047cc | 250 | #endif |
1da177e4 | 251 | |
817bc4db SH |
252 | static struct rt_hash_bucket *rt_hash_table __read_mostly; |
253 | static unsigned rt_hash_mask __read_mostly; | |
254 | static unsigned int rt_hash_log __read_mostly; | |
1da177e4 | 255 | |
2f970d83 | 256 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c | 257 | #define RT_CACHE_STAT_INC(field) \ |
bfe5d834 | 258 | (__raw_get_cpu_var(rt_cache_stat).field++) |
1da177e4 | 259 | |
b00180de DL |
260 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, |
261 | int genid) | |
1da177e4 | 262 | { |
1294fc4a SH |
263 | return jhash_3words((__force u32)(__be32)(daddr), |
264 | (__force u32)(__be32)(saddr), | |
b00180de | 265 | idx, genid) |
29e75252 | 266 | & rt_hash_mask; |
1da177e4 LT |
267 | } |
268 | ||
e84f84f2 DL |
269 | static inline int rt_genid(struct net *net) |
270 | { | |
271 | return atomic_read(&net->ipv4.rt_genid); | |
272 | } | |
273 | ||
1da177e4 LT |
274 | #ifdef CONFIG_PROC_FS |
275 | struct rt_cache_iter_state { | |
a75e936f | 276 | struct seq_net_private p; |
1da177e4 | 277 | int bucket; |
29e75252 | 278 | int genid; |
1da177e4 LT |
279 | }; |
280 | ||
1218854a | 281 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
1da177e4 | 282 | { |
1218854a | 283 | struct rt_cache_iter_state *st = seq->private; |
1da177e4 | 284 | struct rtable *r = NULL; |
1da177e4 LT |
285 | |
286 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
a6272665 ED |
287 | if (!rt_hash_table[st->bucket].chain) |
288 | continue; | |
1da177e4 | 289 | rcu_read_lock_bh(); |
29e75252 ED |
290 | r = rcu_dereference(rt_hash_table[st->bucket].chain); |
291 | while (r) { | |
1218854a | 292 | if (dev_net(r->u.dst.dev) == seq_file_net(seq) && |
a75e936f | 293 | r->rt_genid == st->genid) |
29e75252 ED |
294 | return r; |
295 | r = rcu_dereference(r->u.dst.rt_next); | |
296 | } | |
1da177e4 LT |
297 | rcu_read_unlock_bh(); |
298 | } | |
29e75252 | 299 | return r; |
1da177e4 LT |
300 | } |
301 | ||
1218854a | 302 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
642d6318 | 303 | struct rtable *r) |
1da177e4 | 304 | { |
1218854a | 305 | struct rt_cache_iter_state *st = seq->private; |
a6272665 | 306 | |
093c2ca4 | 307 | r = r->u.dst.rt_next; |
1da177e4 LT |
308 | while (!r) { |
309 | rcu_read_unlock_bh(); | |
a6272665 ED |
310 | do { |
311 | if (--st->bucket < 0) | |
312 | return NULL; | |
313 | } while (!rt_hash_table[st->bucket].chain); | |
1da177e4 LT |
314 | rcu_read_lock_bh(); |
315 | r = rt_hash_table[st->bucket].chain; | |
316 | } | |
0bcceadc | 317 | return rcu_dereference(r); |
1da177e4 LT |
318 | } |
319 | ||
1218854a | 320 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
642d6318 DL |
321 | struct rtable *r) |
322 | { | |
1218854a YH |
323 | struct rt_cache_iter_state *st = seq->private; |
324 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { | |
325 | if (dev_net(r->u.dst.dev) != seq_file_net(seq)) | |
a75e936f | 326 | continue; |
642d6318 DL |
327 | if (r->rt_genid == st->genid) |
328 | break; | |
329 | } | |
330 | return r; | |
331 | } | |
332 | ||
1218854a | 333 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 334 | { |
1218854a | 335 | struct rtable *r = rt_cache_get_first(seq); |
1da177e4 LT |
336 | |
337 | if (r) | |
1218854a | 338 | while (pos && (r = rt_cache_get_next(seq, r))) |
1da177e4 LT |
339 | --pos; |
340 | return pos ? NULL : r; | |
341 | } | |
342 | ||
343 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
344 | { | |
29e75252 | 345 | struct rt_cache_iter_state *st = seq->private; |
29e75252 | 346 | if (*pos) |
1218854a | 347 | return rt_cache_get_idx(seq, *pos - 1); |
e84f84f2 | 348 | st->genid = rt_genid(seq_file_net(seq)); |
29e75252 | 349 | return SEQ_START_TOKEN; |
1da177e4 LT |
350 | } |
351 | ||
352 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
353 | { | |
29e75252 | 354 | struct rtable *r; |
1da177e4 LT |
355 | |
356 | if (v == SEQ_START_TOKEN) | |
1218854a | 357 | r = rt_cache_get_first(seq); |
1da177e4 | 358 | else |
1218854a | 359 | r = rt_cache_get_next(seq, v); |
1da177e4 LT |
360 | ++*pos; |
361 | return r; | |
362 | } | |
363 | ||
364 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
365 | { | |
366 | if (v && v != SEQ_START_TOKEN) | |
367 | rcu_read_unlock_bh(); | |
368 | } | |
369 | ||
370 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
371 | { | |
372 | if (v == SEQ_START_TOKEN) | |
373 | seq_printf(seq, "%-127s\n", | |
374 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
375 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
376 | "HHUptod\tSpecDst"); | |
377 | else { | |
378 | struct rtable *r = v; | |
5e659e4c | 379 | int len; |
1da177e4 | 380 | |
5e659e4c PE |
381 | seq_printf(seq, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" |
382 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", | |
1da177e4 LT |
383 | r->u.dst.dev ? r->u.dst.dev->name : "*", |
384 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
385 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
386 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
387 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
388 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
389 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
390 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
391 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
392 | r->fl.fl4_tos, | |
393 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
394 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
395 | dev_queue_xmit) : 0, | |
5e659e4c PE |
396 | r->rt_spec_dst, &len); |
397 | ||
398 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
e905a9ed YH |
399 | } |
400 | return 0; | |
1da177e4 LT |
401 | } |
402 | ||
f690808e | 403 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
404 | .start = rt_cache_seq_start, |
405 | .next = rt_cache_seq_next, | |
406 | .stop = rt_cache_seq_stop, | |
407 | .show = rt_cache_seq_show, | |
408 | }; | |
409 | ||
410 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
411 | { | |
a75e936f | 412 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 413 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
414 | } |
415 | ||
9a32144e | 416 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
417 | .owner = THIS_MODULE, |
418 | .open = rt_cache_seq_open, | |
419 | .read = seq_read, | |
420 | .llseek = seq_lseek, | |
a75e936f | 421 | .release = seq_release_net, |
1da177e4 LT |
422 | }; |
423 | ||
424 | ||
425 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
426 | { | |
427 | int cpu; | |
428 | ||
429 | if (*pos == 0) | |
430 | return SEQ_START_TOKEN; | |
431 | ||
0f23174a | 432 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
433 | if (!cpu_possible(cpu)) |
434 | continue; | |
435 | *pos = cpu+1; | |
2f970d83 | 436 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
437 | } |
438 | return NULL; | |
439 | } | |
440 | ||
441 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
442 | { | |
443 | int cpu; | |
444 | ||
0f23174a | 445 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
446 | if (!cpu_possible(cpu)) |
447 | continue; | |
448 | *pos = cpu+1; | |
2f970d83 | 449 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
450 | } |
451 | return NULL; | |
e905a9ed | 452 | |
1da177e4 LT |
453 | } |
454 | ||
455 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
456 | { | |
457 | ||
458 | } | |
459 | ||
460 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
461 | { | |
462 | struct rt_cache_stat *st = v; | |
463 | ||
464 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 465 | 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 |
466 | return 0; |
467 | } | |
e905a9ed | 468 | |
1da177e4 LT |
469 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
470 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
471 | atomic_read(&ipv4_dst_ops.entries), | |
472 | st->in_hit, | |
473 | st->in_slow_tot, | |
474 | st->in_slow_mc, | |
475 | st->in_no_route, | |
476 | st->in_brd, | |
477 | st->in_martian_dst, | |
478 | st->in_martian_src, | |
479 | ||
480 | st->out_hit, | |
481 | st->out_slow_tot, | |
e905a9ed | 482 | st->out_slow_mc, |
1da177e4 LT |
483 | |
484 | st->gc_total, | |
485 | st->gc_ignored, | |
486 | st->gc_goal_miss, | |
487 | st->gc_dst_overflow, | |
488 | st->in_hlist_search, | |
489 | st->out_hlist_search | |
490 | ); | |
491 | return 0; | |
492 | } | |
493 | ||
f690808e | 494 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
495 | .start = rt_cpu_seq_start, |
496 | .next = rt_cpu_seq_next, | |
497 | .stop = rt_cpu_seq_stop, | |
498 | .show = rt_cpu_seq_show, | |
499 | }; | |
500 | ||
501 | ||
502 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
503 | { | |
504 | return seq_open(file, &rt_cpu_seq_ops); | |
505 | } | |
506 | ||
9a32144e | 507 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
508 | .owner = THIS_MODULE, |
509 | .open = rt_cpu_seq_open, | |
510 | .read = seq_read, | |
511 | .llseek = seq_lseek, | |
512 | .release = seq_release, | |
513 | }; | |
514 | ||
78c686e9 PE |
515 | #ifdef CONFIG_NET_CLS_ROUTE |
516 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
517 | int length, int *eof, void *data) | |
518 | { | |
519 | unsigned int i; | |
520 | ||
521 | if ((offset & 3) || (length & 3)) | |
522 | return -EIO; | |
523 | ||
524 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
525 | *eof = 1; | |
526 | return 0; | |
527 | } | |
528 | ||
529 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
530 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
531 | *eof = 1; | |
532 | } | |
533 | ||
534 | offset /= sizeof(u32); | |
535 | ||
536 | if (length > 0) { | |
537 | u32 *dst = (u32 *) buffer; | |
538 | ||
539 | *start = buffer; | |
540 | memset(dst, 0, length); | |
541 | ||
542 | for_each_possible_cpu(i) { | |
543 | unsigned int j; | |
544 | u32 *src; | |
545 | ||
546 | src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset; | |
547 | for (j = 0; j < length/4; j++) | |
548 | dst[j] += src[j]; | |
549 | } | |
550 | } | |
551 | return length; | |
552 | } | |
553 | #endif | |
107f1634 | 554 | |
73b38711 | 555 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
556 | { |
557 | struct proc_dir_entry *pde; | |
558 | ||
559 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
560 | &rt_cache_seq_fops); | |
561 | if (!pde) | |
562 | goto err1; | |
563 | ||
77020720 WC |
564 | pde = proc_create("rt_cache", S_IRUGO, |
565 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
566 | if (!pde) |
567 | goto err2; | |
568 | ||
107f1634 PE |
569 | #ifdef CONFIG_NET_CLS_ROUTE |
570 | pde = create_proc_read_entry("rt_acct", 0, net->proc_net, | |
571 | ip_rt_acct_read, NULL); | |
572 | if (!pde) | |
573 | goto err3; | |
574 | #endif | |
575 | return 0; | |
576 | ||
577 | #ifdef CONFIG_NET_CLS_ROUTE | |
578 | err3: | |
579 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
580 | #endif | |
581 | err2: | |
582 | remove_proc_entry("rt_cache", net->proc_net); | |
583 | err1: | |
584 | return -ENOMEM; | |
585 | } | |
73b38711 DL |
586 | |
587 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
588 | { | |
589 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
590 | remove_proc_entry("rt_cache", net->proc_net); | |
591 | remove_proc_entry("rt_acct", net->proc_net); | |
592 | } | |
593 | ||
594 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
595 | .init = ip_rt_do_proc_init, | |
596 | .exit = ip_rt_do_proc_exit, | |
597 | }; | |
598 | ||
599 | static int __init ip_rt_proc_init(void) | |
600 | { | |
601 | return register_pernet_subsys(&ip_rt_proc_ops); | |
602 | } | |
603 | ||
107f1634 | 604 | #else |
73b38711 | 605 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
606 | { |
607 | return 0; | |
608 | } | |
1da177e4 | 609 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 610 | |
5969f71d | 611 | static inline void rt_free(struct rtable *rt) |
1da177e4 | 612 | { |
1da177e4 LT |
613 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
614 | } | |
615 | ||
5969f71d | 616 | static inline void rt_drop(struct rtable *rt) |
1da177e4 | 617 | { |
1da177e4 LT |
618 | ip_rt_put(rt); |
619 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
620 | } | |
621 | ||
5969f71d | 622 | static inline int rt_fast_clean(struct rtable *rth) |
1da177e4 LT |
623 | { |
624 | /* Kill broadcast/multicast entries very aggresively, if they | |
625 | collide in hash table with more useful entries */ | |
626 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 627 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
628 | } |
629 | ||
5969f71d | 630 | static inline int rt_valuable(struct rtable *rth) |
1da177e4 LT |
631 | { |
632 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
633 | rth->u.dst.expires; | |
634 | } | |
635 | ||
636 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
637 | { | |
638 | unsigned long age; | |
639 | int ret = 0; | |
640 | ||
641 | if (atomic_read(&rth->u.dst.__refcnt)) | |
642 | goto out; | |
643 | ||
644 | ret = 1; | |
645 | if (rth->u.dst.expires && | |
646 | time_after_eq(jiffies, rth->u.dst.expires)) | |
647 | goto out; | |
648 | ||
649 | age = jiffies - rth->u.dst.lastuse; | |
650 | ret = 0; | |
651 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
652 | (age <= tmo2 && rt_valuable(rth))) | |
653 | goto out; | |
654 | ret = 1; | |
655 | out: return ret; | |
656 | } | |
657 | ||
658 | /* Bits of score are: | |
659 | * 31: very valuable | |
660 | * 30: not quite useless | |
661 | * 29..0: usage counter | |
662 | */ | |
663 | static inline u32 rt_score(struct rtable *rt) | |
664 | { | |
665 | u32 score = jiffies - rt->u.dst.lastuse; | |
666 | ||
667 | score = ~score & ~(3<<30); | |
668 | ||
669 | if (rt_valuable(rt)) | |
670 | score |= (1<<31); | |
671 | ||
672 | if (!rt->fl.iif || | |
673 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
674 | score |= (1<<30); | |
675 | ||
676 | return score; | |
677 | } | |
678 | ||
1080d709 NH |
679 | static inline bool rt_caching(const struct net *net) |
680 | { | |
681 | return net->ipv4.current_rt_cache_rebuild_count <= | |
682 | net->ipv4.sysctl_rt_cache_rebuild_count; | |
683 | } | |
684 | ||
685 | static inline bool compare_hash_inputs(const struct flowi *fl1, | |
686 | const struct flowi *fl2) | |
687 | { | |
688 | return (__force u32)(((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | | |
689 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr) | | |
690 | (fl1->iif ^ fl2->iif)) == 0); | |
691 | } | |
692 | ||
1da177e4 LT |
693 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
694 | { | |
714e85be AV |
695 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
696 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 697 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
698 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
699 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
700 | (fl1->oif ^ fl2->oif) | | |
701 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
702 | } |
703 | ||
b5921910 DL |
704 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
705 | { | |
c346dca1 | 706 | return dev_net(rt1->u.dst.dev) == dev_net(rt2->u.dst.dev); |
b5921910 DL |
707 | } |
708 | ||
e84f84f2 DL |
709 | static inline int rt_is_expired(struct rtable *rth) |
710 | { | |
711 | return rth->rt_genid != rt_genid(dev_net(rth->u.dst.dev)); | |
712 | } | |
713 | ||
beb659bd ED |
714 | /* |
715 | * Perform a full scan of hash table and free all entries. | |
716 | * Can be called by a softirq or a process. | |
717 | * In the later case, we want to be reschedule if necessary | |
718 | */ | |
719 | static void rt_do_flush(int process_context) | |
720 | { | |
721 | unsigned int i; | |
722 | struct rtable *rth, *next; | |
32cb5b4e | 723 | struct rtable * tail; |
beb659bd ED |
724 | |
725 | for (i = 0; i <= rt_hash_mask; i++) { | |
726 | if (process_context && need_resched()) | |
727 | cond_resched(); | |
728 | rth = rt_hash_table[i].chain; | |
729 | if (!rth) | |
730 | continue; | |
731 | ||
732 | spin_lock_bh(rt_hash_lock_addr(i)); | |
32cb5b4e DL |
733 | #ifdef CONFIG_NET_NS |
734 | { | |
735 | struct rtable ** prev, * p; | |
736 | ||
737 | rth = rt_hash_table[i].chain; | |
738 | ||
739 | /* defer releasing the head of the list after spin_unlock */ | |
740 | for (tail = rth; tail; tail = tail->u.dst.rt_next) | |
741 | if (!rt_is_expired(tail)) | |
742 | break; | |
743 | if (rth != tail) | |
744 | rt_hash_table[i].chain = tail; | |
745 | ||
746 | /* call rt_free on entries after the tail requiring flush */ | |
747 | prev = &rt_hash_table[i].chain; | |
748 | for (p = *prev; p; p = next) { | |
749 | next = p->u.dst.rt_next; | |
750 | if (!rt_is_expired(p)) { | |
751 | prev = &p->u.dst.rt_next; | |
752 | } else { | |
753 | *prev = next; | |
754 | rt_free(p); | |
755 | } | |
756 | } | |
757 | } | |
758 | #else | |
beb659bd ED |
759 | rth = rt_hash_table[i].chain; |
760 | rt_hash_table[i].chain = NULL; | |
32cb5b4e DL |
761 | tail = NULL; |
762 | #endif | |
beb659bd ED |
763 | spin_unlock_bh(rt_hash_lock_addr(i)); |
764 | ||
32cb5b4e | 765 | for (; rth != tail; rth = next) { |
beb659bd ED |
766 | next = rth->u.dst.rt_next; |
767 | rt_free(rth); | |
768 | } | |
769 | } | |
770 | } | |
771 | ||
1080d709 NH |
772 | /* |
773 | * While freeing expired entries, we compute average chain length | |
774 | * and standard deviation, using fixed-point arithmetic. | |
775 | * This to have an estimation of rt_chain_length_max | |
776 | * rt_chain_length_max = max(elasticity, AVG + 4*SD) | |
777 | * We use 3 bits for frational part, and 29 (or 61) for magnitude. | |
778 | */ | |
779 | ||
780 | #define FRACT_BITS 3 | |
781 | #define ONE (1UL << FRACT_BITS) | |
782 | ||
beb659bd | 783 | static void rt_check_expire(void) |
1da177e4 | 784 | { |
bb1d23b0 ED |
785 | static unsigned int rover; |
786 | unsigned int i = rover, goal; | |
1da177e4 | 787 | struct rtable *rth, **rthp; |
1080d709 NH |
788 | unsigned long length = 0, samples = 0; |
789 | unsigned long sum = 0, sum2 = 0; | |
bb1d23b0 ED |
790 | u64 mult; |
791 | ||
792 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
793 | if (ip_rt_gc_timeout > 1) | |
794 | do_div(mult, ip_rt_gc_timeout); | |
795 | goal = (unsigned int)mult; | |
39c90ece ED |
796 | if (goal > rt_hash_mask) |
797 | goal = rt_hash_mask + 1; | |
1080d709 | 798 | length = 0; |
bb1d23b0 | 799 | for (; goal > 0; goal--) { |
1da177e4 LT |
800 | unsigned long tmo = ip_rt_gc_timeout; |
801 | ||
802 | i = (i + 1) & rt_hash_mask; | |
803 | rthp = &rt_hash_table[i].chain; | |
804 | ||
d90bf5a9 ED |
805 | if (need_resched()) |
806 | cond_resched(); | |
807 | ||
1080d709 NH |
808 | samples++; |
809 | ||
cfcabdcc | 810 | if (*rthp == NULL) |
bb1d23b0 | 811 | continue; |
39c90ece | 812 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 | 813 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 814 | if (rt_is_expired(rth)) { |
29e75252 ED |
815 | *rthp = rth->u.dst.rt_next; |
816 | rt_free(rth); | |
817 | continue; | |
818 | } | |
1da177e4 LT |
819 | if (rth->u.dst.expires) { |
820 | /* Entry is expired even if it is in use */ | |
39c90ece | 821 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
1da177e4 | 822 | tmo >>= 1; |
093c2ca4 | 823 | rthp = &rth->u.dst.rt_next; |
1080d709 NH |
824 | /* |
825 | * Only bump our length if the hash | |
826 | * inputs on entries n and n+1 are not | |
827 | * the same, we only count entries on | |
828 | * a chain with equal hash inputs once | |
829 | * so that entries for different QOS | |
830 | * levels, and other non-hash input | |
831 | * attributes don't unfairly skew | |
832 | * the length computation | |
833 | */ | |
834 | if ((*rthp == NULL) || | |
835 | !compare_hash_inputs(&(*rthp)->fl, | |
836 | &rth->fl)) | |
837 | length += ONE; | |
1da177e4 LT |
838 | continue; |
839 | } | |
840 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
841 | tmo >>= 1; | |
093c2ca4 | 842 | rthp = &rth->u.dst.rt_next; |
1080d709 NH |
843 | if ((*rthp == NULL) || |
844 | !compare_hash_inputs(&(*rthp)->fl, | |
845 | &rth->fl)) | |
846 | length += ONE; | |
1da177e4 LT |
847 | continue; |
848 | } | |
849 | ||
850 | /* Cleanup aged off entries. */ | |
093c2ca4 | 851 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 852 | rt_free(rth); |
1da177e4 | 853 | } |
39c90ece | 854 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1080d709 NH |
855 | sum += length; |
856 | sum2 += length*length; | |
857 | } | |
858 | if (samples) { | |
859 | unsigned long avg = sum / samples; | |
860 | unsigned long sd = int_sqrt(sum2 / samples - avg*avg); | |
861 | rt_chain_length_max = max_t(unsigned long, | |
862 | ip_rt_gc_elasticity, | |
863 | (avg + 4*sd) >> FRACT_BITS); | |
1da177e4 LT |
864 | } |
865 | rover = i; | |
beb659bd ED |
866 | } |
867 | ||
868 | /* | |
869 | * rt_worker_func() is run in process context. | |
29e75252 | 870 | * we call rt_check_expire() to scan part of the hash table |
beb659bd ED |
871 | */ |
872 | static void rt_worker_func(struct work_struct *work) | |
873 | { | |
29e75252 | 874 | rt_check_expire(); |
39c90ece | 875 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
1da177e4 LT |
876 | } |
877 | ||
29e75252 ED |
878 | /* |
879 | * Pertubation of rt_genid by a small quantity [1..256] | |
880 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() | |
881 | * many times (2^24) without giving recent rt_genid. | |
882 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 883 | */ |
86c657f6 | 884 | static void rt_cache_invalidate(struct net *net) |
1da177e4 | 885 | { |
29e75252 | 886 | unsigned char shuffle; |
1da177e4 | 887 | |
29e75252 | 888 | get_random_bytes(&shuffle, sizeof(shuffle)); |
e84f84f2 | 889 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
1da177e4 LT |
890 | } |
891 | ||
29e75252 ED |
892 | /* |
893 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
894 | * delay >= 0 : invalidate & flush cache (can be long) | |
895 | */ | |
76e6ebfb | 896 | void rt_cache_flush(struct net *net, int delay) |
1da177e4 | 897 | { |
86c657f6 | 898 | rt_cache_invalidate(net); |
29e75252 ED |
899 | if (delay >= 0) |
900 | rt_do_flush(!in_softirq()); | |
1da177e4 LT |
901 | } |
902 | ||
beb659bd | 903 | /* |
29e75252 | 904 | * We change rt_genid and let gc do the cleanup |
beb659bd | 905 | */ |
9f5e97e5 | 906 | static void rt_secret_rebuild(unsigned long __net) |
1da177e4 | 907 | { |
9f5e97e5 | 908 | struct net *net = (struct net *)__net; |
86c657f6 | 909 | rt_cache_invalidate(net); |
9f5e97e5 | 910 | mod_timer(&net->ipv4.rt_secret_timer, jiffies + ip_rt_secret_interval); |
1da177e4 LT |
911 | } |
912 | ||
1080d709 NH |
913 | static void rt_secret_rebuild_oneshot(struct net *net) |
914 | { | |
915 | del_timer_sync(&net->ipv4.rt_secret_timer); | |
916 | rt_cache_invalidate(net); | |
917 | if (ip_rt_secret_interval) { | |
918 | net->ipv4.rt_secret_timer.expires += ip_rt_secret_interval; | |
919 | add_timer(&net->ipv4.rt_secret_timer); | |
920 | } | |
921 | } | |
922 | ||
923 | static void rt_emergency_hash_rebuild(struct net *net) | |
924 | { | |
925 | if (net_ratelimit()) { | |
926 | printk(KERN_WARNING "Route hash chain too long!\n"); | |
927 | printk(KERN_WARNING "Adjust your secret_interval!\n"); | |
928 | } | |
929 | ||
930 | rt_secret_rebuild_oneshot(net); | |
931 | } | |
932 | ||
1da177e4 LT |
933 | /* |
934 | Short description of GC goals. | |
935 | ||
936 | We want to build algorithm, which will keep routing cache | |
937 | at some equilibrium point, when number of aged off entries | |
938 | is kept approximately equal to newly generated ones. | |
939 | ||
940 | Current expiration strength is variable "expire". | |
941 | We try to adjust it dynamically, so that if networking | |
942 | is idle expires is large enough to keep enough of warm entries, | |
943 | and when load increases it reduces to limit cache size. | |
944 | */ | |
945 | ||
569d3645 | 946 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
947 | { |
948 | static unsigned long expire = RT_GC_TIMEOUT; | |
949 | static unsigned long last_gc; | |
950 | static int rover; | |
951 | static int equilibrium; | |
952 | struct rtable *rth, **rthp; | |
953 | unsigned long now = jiffies; | |
954 | int goal; | |
955 | ||
956 | /* | |
957 | * Garbage collection is pretty expensive, | |
958 | * do not make it too frequently. | |
959 | */ | |
960 | ||
961 | RT_CACHE_STAT_INC(gc_total); | |
962 | ||
963 | if (now - last_gc < ip_rt_gc_min_interval && | |
964 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
965 | RT_CACHE_STAT_INC(gc_ignored); | |
966 | goto out; | |
967 | } | |
968 | ||
969 | /* Calculate number of entries, which we want to expire now. */ | |
970 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
971 | (ip_rt_gc_elasticity << rt_hash_log); | |
972 | if (goal <= 0) { | |
973 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
974 | equilibrium = ipv4_dst_ops.gc_thresh; | |
975 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
976 | if (goal > 0) { | |
b790cedd | 977 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
978 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
979 | } | |
980 | } else { | |
981 | /* We are in dangerous area. Try to reduce cache really | |
982 | * aggressively. | |
983 | */ | |
b790cedd | 984 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
985 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
986 | } | |
987 | ||
988 | if (now - last_gc >= ip_rt_gc_min_interval) | |
989 | last_gc = now; | |
990 | ||
991 | if (goal <= 0) { | |
992 | equilibrium += goal; | |
993 | goto work_done; | |
994 | } | |
995 | ||
996 | do { | |
997 | int i, k; | |
998 | ||
999 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
1000 | unsigned long tmo = expire; | |
1001 | ||
1002 | k = (k + 1) & rt_hash_mask; | |
1003 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 1004 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 | 1005 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 1006 | if (!rt_is_expired(rth) && |
29e75252 | 1007 | !rt_may_expire(rth, tmo, expire)) { |
1da177e4 | 1008 | tmo >>= 1; |
093c2ca4 | 1009 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1010 | continue; |
1011 | } | |
093c2ca4 | 1012 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
1013 | rt_free(rth); |
1014 | goal--; | |
1da177e4 | 1015 | } |
22c047cc | 1016 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
1017 | if (goal <= 0) |
1018 | break; | |
1019 | } | |
1020 | rover = k; | |
1021 | ||
1022 | if (goal <= 0) | |
1023 | goto work_done; | |
1024 | ||
1025 | /* Goal is not achieved. We stop process if: | |
1026 | ||
1027 | - if expire reduced to zero. Otherwise, expire is halfed. | |
1028 | - if table is not full. | |
1029 | - if we are called from interrupt. | |
1030 | - jiffies check is just fallback/debug loop breaker. | |
1031 | We will not spin here for long time in any case. | |
1032 | */ | |
1033 | ||
1034 | RT_CACHE_STAT_INC(gc_goal_miss); | |
1035 | ||
1036 | if (expire == 0) | |
1037 | break; | |
1038 | ||
1039 | expire >>= 1; | |
1040 | #if RT_CACHE_DEBUG >= 2 | |
1041 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
1042 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
1043 | #endif | |
1044 | ||
1045 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
1046 | goto out; | |
1047 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
1048 | ||
1049 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
1050 | goto out; | |
1051 | if (net_ratelimit()) | |
1052 | printk(KERN_WARNING "dst cache overflow\n"); | |
1053 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
1054 | return 1; | |
1055 | ||
1056 | work_done: | |
1057 | expire += ip_rt_gc_min_interval; | |
1058 | if (expire > ip_rt_gc_timeout || | |
1059 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
1060 | expire = ip_rt_gc_timeout; | |
1061 | #if RT_CACHE_DEBUG >= 2 | |
1062 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
1063 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
1064 | #endif | |
1065 | out: return 0; | |
1066 | } | |
1067 | ||
1068 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
1069 | { | |
1070 | struct rtable *rth, **rthp; | |
1080d709 | 1071 | struct rtable *rthi; |
1da177e4 LT |
1072 | unsigned long now; |
1073 | struct rtable *cand, **candp; | |
1074 | u32 min_score; | |
1075 | int chain_length; | |
1076 | int attempts = !in_softirq(); | |
1077 | ||
1078 | restart: | |
1079 | chain_length = 0; | |
1080 | min_score = ~(u32)0; | |
1081 | cand = NULL; | |
1082 | candp = NULL; | |
1083 | now = jiffies; | |
1084 | ||
1080d709 NH |
1085 | if (!rt_caching(dev_net(rt->u.dst.dev))) { |
1086 | rt_drop(rt); | |
1087 | return 0; | |
1088 | } | |
1089 | ||
1da177e4 | 1090 | rthp = &rt_hash_table[hash].chain; |
1080d709 | 1091 | rthi = NULL; |
1da177e4 | 1092 | |
22c047cc | 1093 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1094 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 1095 | if (rt_is_expired(rth)) { |
29e75252 ED |
1096 | *rthp = rth->u.dst.rt_next; |
1097 | rt_free(rth); | |
1098 | continue; | |
1099 | } | |
b5921910 | 1100 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
1da177e4 | 1101 | /* Put it first */ |
093c2ca4 | 1102 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
1103 | /* |
1104 | * Since lookup is lockfree, the deletion | |
1105 | * must be visible to another weakly ordered CPU before | |
1106 | * the insertion at the start of the hash chain. | |
1107 | */ | |
093c2ca4 | 1108 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
1109 | rt_hash_table[hash].chain); |
1110 | /* | |
1111 | * Since lookup is lockfree, the update writes | |
1112 | * must be ordered for consistency on SMP. | |
1113 | */ | |
1114 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
1115 | ||
03f49f34 | 1116 | dst_use(&rth->u.dst, now); |
22c047cc | 1117 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1118 | |
1119 | rt_drop(rt); | |
1120 | *rp = rth; | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
1125 | u32 score = rt_score(rth); | |
1126 | ||
1127 | if (score <= min_score) { | |
1128 | cand = rth; | |
1129 | candp = rthp; | |
1130 | min_score = score; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | chain_length++; | |
1135 | ||
093c2ca4 | 1136 | rthp = &rth->u.dst.rt_next; |
1080d709 NH |
1137 | |
1138 | /* | |
1139 | * check to see if the next entry in the chain | |
1140 | * contains the same hash input values as rt. If it does | |
1141 | * This is where we will insert into the list, instead of | |
1142 | * at the head. This groups entries that differ by aspects not | |
1143 | * relvant to the hash function together, which we use to adjust | |
1144 | * our chain length | |
1145 | */ | |
1146 | if (*rthp && compare_hash_inputs(&(*rthp)->fl, &rt->fl)) | |
1147 | rthi = rth; | |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | if (cand) { | |
1151 | /* ip_rt_gc_elasticity used to be average length of chain | |
1152 | * length, when exceeded gc becomes really aggressive. | |
1153 | * | |
1154 | * The second limit is less certain. At the moment it allows | |
1155 | * only 2 entries per bucket. We will see. | |
1156 | */ | |
1157 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 1158 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
1159 | rt_free(cand); |
1160 | } | |
1080d709 NH |
1161 | } else { |
1162 | if (chain_length > rt_chain_length_max) { | |
1163 | struct net *net = dev_net(rt->u.dst.dev); | |
1164 | int num = ++net->ipv4.current_rt_cache_rebuild_count; | |
1165 | if (!rt_caching(dev_net(rt->u.dst.dev))) { | |
1166 | printk(KERN_WARNING "%s: %d rebuilds is over limit, route caching disabled\n", | |
1167 | rt->u.dst.dev->name, num); | |
1168 | } | |
1169 | rt_emergency_hash_rebuild(dev_net(rt->u.dst.dev)); | |
1170 | } | |
1da177e4 LT |
1171 | } |
1172 | ||
1173 | /* Try to bind route to arp only if it is output | |
1174 | route or unicast forwarding path. | |
1175 | */ | |
1176 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
1177 | int err = arp_bind_neighbour(&rt->u.dst); | |
1178 | if (err) { | |
22c047cc | 1179 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1180 | |
1181 | if (err != -ENOBUFS) { | |
1182 | rt_drop(rt); | |
1183 | return err; | |
1184 | } | |
1185 | ||
1186 | /* Neighbour tables are full and nothing | |
1187 | can be released. Try to shrink route cache, | |
1188 | it is most likely it holds some neighbour records. | |
1189 | */ | |
1190 | if (attempts-- > 0) { | |
1191 | int saved_elasticity = ip_rt_gc_elasticity; | |
1192 | int saved_int = ip_rt_gc_min_interval; | |
1193 | ip_rt_gc_elasticity = 1; | |
1194 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1195 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1196 | ip_rt_gc_min_interval = saved_int; |
1197 | ip_rt_gc_elasticity = saved_elasticity; | |
1198 | goto restart; | |
1199 | } | |
1200 | ||
1201 | if (net_ratelimit()) | |
1202 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1203 | rt_drop(rt); | |
1204 | return -ENOBUFS; | |
1205 | } | |
1206 | } | |
1207 | ||
1080d709 NH |
1208 | if (rthi) |
1209 | rt->u.dst.rt_next = rthi->u.dst.rt_next; | |
1210 | else | |
1211 | rt->u.dst.rt_next = rt_hash_table[hash].chain; | |
1212 | ||
1da177e4 | 1213 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 1214 | if (rt->u.dst.rt_next) { |
1da177e4 | 1215 | struct rtable *trt; |
673d57e7 | 1216 | printk(KERN_DEBUG "rt_cache @%02x: %pI4", hash, &rt->rt_dst); |
093c2ca4 | 1217 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
673d57e7 | 1218 | printk(" . %pI4", &trt->rt_dst); |
1da177e4 LT |
1219 | printk("\n"); |
1220 | } | |
1221 | #endif | |
00269b54 ED |
1222 | /* |
1223 | * Since lookup is lockfree, we must make sure | |
1224 | * previous writes to rt are comitted to memory | |
1225 | * before making rt visible to other CPUS. | |
1226 | */ | |
1080d709 NH |
1227 | if (rthi) |
1228 | rcu_assign_pointer(rthi->u.dst.rt_next, rt); | |
1229 | else | |
1230 | rcu_assign_pointer(rt_hash_table[hash].chain, rt); | |
1231 | ||
22c047cc | 1232 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1233 | *rp = rt; |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | void rt_bind_peer(struct rtable *rt, int create) | |
1238 | { | |
1239 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1240 | struct inet_peer *peer; | |
1241 | ||
1242 | peer = inet_getpeer(rt->rt_dst, create); | |
1243 | ||
1244 | spin_lock_bh(&rt_peer_lock); | |
1245 | if (rt->peer == NULL) { | |
1246 | rt->peer = peer; | |
1247 | peer = NULL; | |
1248 | } | |
1249 | spin_unlock_bh(&rt_peer_lock); | |
1250 | if (peer) | |
1251 | inet_putpeer(peer); | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1256 | * we still can generate some output. | |
1257 | * Random ID selection looks a bit dangerous because we have no chances to | |
1258 | * select ID being unique in a reasonable period of time. | |
1259 | * But broken packet identifier may be better than no packet at all. | |
1260 | */ | |
1261 | static void ip_select_fb_ident(struct iphdr *iph) | |
1262 | { | |
1263 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1264 | static u32 ip_fallback_id; | |
1265 | u32 salt; | |
1266 | ||
1267 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1268 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1269 | iph->id = htons(salt & 0xFFFF); |
1270 | ip_fallback_id = salt; | |
1271 | spin_unlock_bh(&ip_fb_id_lock); | |
1272 | } | |
1273 | ||
1274 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1275 | { | |
1276 | struct rtable *rt = (struct rtable *) dst; | |
1277 | ||
1278 | if (rt) { | |
1279 | if (rt->peer == NULL) | |
1280 | rt_bind_peer(rt, 1); | |
1281 | ||
1282 | /* If peer is attached to destination, it is never detached, | |
1283 | so that we need not to grab a lock to dereference it. | |
1284 | */ | |
1285 | if (rt->peer) { | |
1286 | iph->id = htons(inet_getid(rt->peer, more)); | |
1287 | return; | |
1288 | } | |
1289 | } else | |
e905a9ed | 1290 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1291 | __builtin_return_address(0)); |
1da177e4 LT |
1292 | |
1293 | ip_select_fb_ident(iph); | |
1294 | } | |
1295 | ||
1296 | static void rt_del(unsigned hash, struct rtable *rt) | |
1297 | { | |
29e75252 | 1298 | struct rtable **rthp, *aux; |
1da177e4 | 1299 | |
29e75252 | 1300 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1301 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1302 | ip_rt_put(rt); |
29e75252 | 1303 | while ((aux = *rthp) != NULL) { |
e84f84f2 | 1304 | if (aux == rt || rt_is_expired(aux)) { |
29e75252 ED |
1305 | *rthp = aux->u.dst.rt_next; |
1306 | rt_free(aux); | |
1307 | continue; | |
1da177e4 | 1308 | } |
29e75252 ED |
1309 | rthp = &aux->u.dst.rt_next; |
1310 | } | |
22c047cc | 1311 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1312 | } |
1313 | ||
f7655229 AV |
1314 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1315 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1316 | { |
1317 | int i, k; | |
1318 | struct in_device *in_dev = in_dev_get(dev); | |
1319 | struct rtable *rth, **rthp; | |
f7655229 | 1320 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1321 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1322 | struct netevent_redirect netevent; |
317805b8 | 1323 | struct net *net; |
1da177e4 | 1324 | |
1da177e4 LT |
1325 | if (!in_dev) |
1326 | return; | |
1327 | ||
c346dca1 | 1328 | net = dev_net(dev); |
1da177e4 | 1329 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
1e637c74 | 1330 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
f97c1e0c | 1331 | || ipv4_is_zeronet(new_gw)) |
1da177e4 LT |
1332 | goto reject_redirect; |
1333 | ||
1080d709 NH |
1334 | if (!rt_caching(net)) |
1335 | goto reject_redirect; | |
1336 | ||
1da177e4 LT |
1337 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
1338 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1339 | goto reject_redirect; | |
1340 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1341 | goto reject_redirect; | |
1342 | } else { | |
317805b8 | 1343 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1344 | goto reject_redirect; |
1345 | } | |
1346 | ||
1347 | for (i = 0; i < 2; i++) { | |
1348 | for (k = 0; k < 2; k++) { | |
b00180de | 1349 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k], |
e84f84f2 | 1350 | rt_genid(net)); |
1da177e4 LT |
1351 | |
1352 | rthp=&rt_hash_table[hash].chain; | |
1353 | ||
1354 | rcu_read_lock(); | |
1355 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1356 | struct rtable *rt; | |
1357 | ||
1358 | if (rth->fl.fl4_dst != daddr || | |
1359 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 | 1360 | rth->fl.oif != ikeys[k] || |
29e75252 | 1361 | rth->fl.iif != 0 || |
e84f84f2 | 1362 | rt_is_expired(rth) || |
878628fb | 1363 | !net_eq(dev_net(rth->u.dst.dev), net)) { |
093c2ca4 | 1364 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1365 | continue; |
1366 | } | |
1367 | ||
1368 | if (rth->rt_dst != daddr || | |
1369 | rth->rt_src != saddr || | |
1370 | rth->u.dst.error || | |
1371 | rth->rt_gateway != old_gw || | |
1372 | rth->u.dst.dev != dev) | |
1373 | break; | |
1374 | ||
1375 | dst_hold(&rth->u.dst); | |
1376 | rcu_read_unlock(); | |
1377 | ||
1378 | rt = dst_alloc(&ipv4_dst_ops); | |
1379 | if (rt == NULL) { | |
1380 | ip_rt_put(rth); | |
1381 | in_dev_put(in_dev); | |
1382 | return; | |
1383 | } | |
1384 | ||
1385 | /* Copy all the information. */ | |
1386 | *rt = *rth; | |
1da177e4 LT |
1387 | rt->u.dst.__use = 1; |
1388 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1389 | rt->u.dst.child = NULL; | |
1390 | if (rt->u.dst.dev) | |
1391 | dev_hold(rt->u.dst.dev); | |
1392 | if (rt->idev) | |
1393 | in_dev_hold(rt->idev); | |
1394 | rt->u.dst.obsolete = 0; | |
1395 | rt->u.dst.lastuse = jiffies; | |
1396 | rt->u.dst.path = &rt->u.dst; | |
1397 | rt->u.dst.neighbour = NULL; | |
1398 | rt->u.dst.hh = NULL; | |
def8b4fa | 1399 | #ifdef CONFIG_XFRM |
1da177e4 | 1400 | rt->u.dst.xfrm = NULL; |
def8b4fa | 1401 | #endif |
e84f84f2 | 1402 | rt->rt_genid = rt_genid(net); |
1da177e4 LT |
1403 | rt->rt_flags |= RTCF_REDIRECTED; |
1404 | ||
1405 | /* Gateway is different ... */ | |
1406 | rt->rt_gateway = new_gw; | |
1407 | ||
1408 | /* Redirect received -> path was valid */ | |
1409 | dst_confirm(&rth->u.dst); | |
1410 | ||
1411 | if (rt->peer) | |
1412 | atomic_inc(&rt->peer->refcnt); | |
1413 | ||
1414 | if (arp_bind_neighbour(&rt->u.dst) || | |
1415 | !(rt->u.dst.neighbour->nud_state & | |
1416 | NUD_VALID)) { | |
1417 | if (rt->u.dst.neighbour) | |
1418 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1419 | ip_rt_put(rth); | |
1420 | rt_drop(rt); | |
1421 | goto do_next; | |
1422 | } | |
e905a9ed | 1423 | |
8d71740c TT |
1424 | netevent.old = &rth->u.dst; |
1425 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1426 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1427 | &netevent); | |
1da177e4 LT |
1428 | |
1429 | rt_del(hash, rth); | |
1430 | if (!rt_intern_hash(hash, rt, &rt)) | |
1431 | ip_rt_put(rt); | |
1432 | goto do_next; | |
1433 | } | |
1434 | rcu_read_unlock(); | |
1435 | do_next: | |
1436 | ; | |
1437 | } | |
1438 | } | |
1439 | in_dev_put(in_dev); | |
1440 | return; | |
1441 | ||
1442 | reject_redirect: | |
1443 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1444 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
673d57e7 HH |
1445 | printk(KERN_INFO "Redirect from %pI4 on %s about %pI4 ignored.\n" |
1446 | " Advised path = %pI4 -> %pI4\n", | |
1447 | &old_gw, dev->name, &new_gw, | |
1448 | &saddr, &daddr); | |
1da177e4 LT |
1449 | #endif |
1450 | in_dev_put(in_dev); | |
1451 | } | |
1452 | ||
1453 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1454 | { | |
ee6b9673 | 1455 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
1456 | struct dst_entry *ret = dst; |
1457 | ||
1458 | if (rt) { | |
1459 | if (dst->obsolete) { | |
1460 | ip_rt_put(rt); | |
1461 | ret = NULL; | |
1462 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1463 | rt->u.dst.expires) { | |
8c7bc840 | 1464 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
b00180de | 1465 | rt->fl.oif, |
e84f84f2 | 1466 | rt_genid(dev_net(dst->dev))); |
1da177e4 | 1467 | #if RT_CACHE_DEBUG >= 1 |
673d57e7 HH |
1468 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to %pI4/%02x dropped\n", |
1469 | &rt->rt_dst, rt->fl.fl4_tos); | |
1da177e4 LT |
1470 | #endif |
1471 | rt_del(hash, rt); | |
1472 | ret = NULL; | |
1473 | } | |
1474 | } | |
1475 | return ret; | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * Algorithm: | |
1480 | * 1. The first ip_rt_redirect_number redirects are sent | |
1481 | * with exponential backoff, then we stop sending them at all, | |
1482 | * assuming that the host ignores our redirects. | |
1483 | * 2. If we did not see packets requiring redirects | |
1484 | * during ip_rt_redirect_silence, we assume that the host | |
1485 | * forgot redirected route and start to send redirects again. | |
1486 | * | |
1487 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1488 | * in icmp.c. | |
1489 | * | |
1490 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1491 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1492 | */ | |
1493 | ||
1494 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1495 | { | |
ee6b9673 | 1496 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1497 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
1498 | ||
1499 | if (!in_dev) | |
1500 | return; | |
1501 | ||
1502 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1503 | goto out; | |
1504 | ||
1505 | /* No redirected packets during ip_rt_redirect_silence; | |
1506 | * reset the algorithm. | |
1507 | */ | |
1508 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1509 | rt->u.dst.rate_tokens = 0; | |
1510 | ||
1511 | /* Too many ignored redirects; do not send anything | |
1512 | * set u.dst.rate_last to the last seen redirected packet. | |
1513 | */ | |
1514 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1515 | rt->u.dst.rate_last = jiffies; | |
1516 | goto out; | |
1517 | } | |
1518 | ||
1519 | /* Check for load limit; set rate_last to the latest sent | |
1520 | * redirect. | |
1521 | */ | |
14fb8a76 LY |
1522 | if (rt->u.dst.rate_tokens == 0 || |
1523 | time_after(jiffies, | |
1da177e4 LT |
1524 | (rt->u.dst.rate_last + |
1525 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1526 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1527 | rt->u.dst.rate_last = jiffies; | |
1528 | ++rt->u.dst.rate_tokens; | |
1529 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1530 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1531 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1532 | net_ratelimit()) | |
673d57e7 HH |
1533 | printk(KERN_WARNING "host %pI4/if%d ignores redirects for %pI4 to %pI4.\n", |
1534 | &rt->rt_src, rt->rt_iif, | |
1535 | &rt->rt_dst, &rt->rt_gateway); | |
1da177e4 LT |
1536 | #endif |
1537 | } | |
1538 | out: | |
e905a9ed | 1539 | in_dev_put(in_dev); |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | static int ip_error(struct sk_buff *skb) | |
1543 | { | |
ee6b9673 | 1544 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1545 | unsigned long now; |
1546 | int code; | |
1547 | ||
1548 | switch (rt->u.dst.error) { | |
1549 | case EINVAL: | |
1550 | default: | |
1551 | goto out; | |
1552 | case EHOSTUNREACH: | |
1553 | code = ICMP_HOST_UNREACH; | |
1554 | break; | |
1555 | case ENETUNREACH: | |
1556 | code = ICMP_NET_UNREACH; | |
7c73a6fa PE |
1557 | IP_INC_STATS_BH(dev_net(rt->u.dst.dev), |
1558 | IPSTATS_MIB_INNOROUTES); | |
1da177e4 LT |
1559 | break; |
1560 | case EACCES: | |
1561 | code = ICMP_PKT_FILTERED; | |
1562 | break; | |
1563 | } | |
1564 | ||
1565 | now = jiffies; | |
1566 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1567 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1568 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1569 | rt->u.dst.rate_last = now; | |
1570 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1571 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1572 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1573 | } | |
1574 | ||
1575 | out: kfree_skb(skb); | |
1576 | return 0; | |
e905a9ed | 1577 | } |
1da177e4 LT |
1578 | |
1579 | /* | |
1580 | * The last two values are not from the RFC but | |
1581 | * are needed for AMPRnet AX.25 paths. | |
1582 | */ | |
1583 | ||
9b5b5cff | 1584 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1585 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1586 | ||
5969f71d | 1587 | static inline unsigned short guess_mtu(unsigned short old_mtu) |
1da177e4 LT |
1588 | { |
1589 | int i; | |
e905a9ed | 1590 | |
1da177e4 LT |
1591 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1592 | if (old_mtu > mtu_plateau[i]) | |
1593 | return mtu_plateau[i]; | |
1594 | return 68; | |
1595 | } | |
1596 | ||
b5921910 | 1597 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
0010e465 TT |
1598 | unsigned short new_mtu, |
1599 | struct net_device *dev) | |
1da177e4 | 1600 | { |
0010e465 | 1601 | int i, k; |
1da177e4 LT |
1602 | unsigned short old_mtu = ntohs(iph->tot_len); |
1603 | struct rtable *rth; | |
0010e465 | 1604 | int ikeys[2] = { dev->ifindex, 0 }; |
e448515c AV |
1605 | __be32 skeys[2] = { iph->saddr, 0, }; |
1606 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1607 | unsigned short est_mtu = 0; |
1608 | ||
1609 | if (ipv4_config.no_pmtu_disc) | |
1610 | return 0; | |
1611 | ||
0010e465 TT |
1612 | for (k = 0; k < 2; k++) { |
1613 | for (i = 0; i < 2; i++) { | |
b00180de | 1614 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k], |
e84f84f2 | 1615 | rt_genid(net)); |
0010e465 TT |
1616 | |
1617 | rcu_read_lock(); | |
1618 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
1619 | rth = rcu_dereference(rth->u.dst.rt_next)) { | |
1da177e4 LT |
1620 | unsigned short mtu = new_mtu; |
1621 | ||
0010e465 TT |
1622 | if (rth->fl.fl4_dst != daddr || |
1623 | rth->fl.fl4_src != skeys[i] || | |
1624 | rth->rt_dst != daddr || | |
1625 | rth->rt_src != iph->saddr || | |
1626 | rth->fl.oif != ikeys[k] || | |
1627 | rth->fl.iif != 0 || | |
1628 | dst_metric_locked(&rth->u.dst, RTAX_MTU) || | |
1629 | !net_eq(dev_net(rth->u.dst.dev), net) || | |
6c3b8fc6 | 1630 | rt_is_expired(rth)) |
0010e465 TT |
1631 | continue; |
1632 | ||
1da177e4 LT |
1633 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
1634 | ||
1635 | /* BSD 4.2 compatibility hack :-( */ | |
1636 | if (mtu == 0 && | |
6d273f8d | 1637 | old_mtu >= dst_mtu(&rth->u.dst) && |
1da177e4 LT |
1638 | old_mtu >= 68 + (iph->ihl << 2)) |
1639 | old_mtu -= iph->ihl << 2; | |
1640 | ||
1641 | mtu = guess_mtu(old_mtu); | |
1642 | } | |
6d273f8d RR |
1643 | if (mtu <= dst_mtu(&rth->u.dst)) { |
1644 | if (mtu < dst_mtu(&rth->u.dst)) { | |
1da177e4 LT |
1645 | dst_confirm(&rth->u.dst); |
1646 | if (mtu < ip_rt_min_pmtu) { | |
1647 | mtu = ip_rt_min_pmtu; | |
1648 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1649 | (1 << RTAX_MTU); | |
1650 | } | |
1651 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1652 | dst_set_expires(&rth->u.dst, | |
1653 | ip_rt_mtu_expires); | |
1654 | } | |
1655 | est_mtu = mtu; | |
1656 | } | |
1657 | } | |
0010e465 | 1658 | rcu_read_unlock(); |
1da177e4 | 1659 | } |
1da177e4 LT |
1660 | } |
1661 | return est_mtu ? : new_mtu; | |
1662 | } | |
1663 | ||
1664 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1665 | { | |
6d273f8d | 1666 | if (dst_mtu(dst) > mtu && mtu >= 68 && |
1da177e4 LT |
1667 | !(dst_metric_locked(dst, RTAX_MTU))) { |
1668 | if (mtu < ip_rt_min_pmtu) { | |
1669 | mtu = ip_rt_min_pmtu; | |
1670 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1671 | } | |
1672 | dst->metrics[RTAX_MTU-1] = mtu; | |
1673 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1674 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1675 | } |
1676 | } | |
1677 | ||
1678 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1679 | { | |
1680 | return NULL; | |
1681 | } | |
1682 | ||
1683 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1684 | { | |
1685 | struct rtable *rt = (struct rtable *) dst; | |
1686 | struct inet_peer *peer = rt->peer; | |
1687 | struct in_device *idev = rt->idev; | |
1688 | ||
1689 | if (peer) { | |
1690 | rt->peer = NULL; | |
1691 | inet_putpeer(peer); | |
1692 | } | |
1693 | ||
1694 | if (idev) { | |
1695 | rt->idev = NULL; | |
1696 | in_dev_put(idev); | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1701 | int how) | |
1702 | { | |
1703 | struct rtable *rt = (struct rtable *) dst; | |
1704 | struct in_device *idev = rt->idev; | |
c346dca1 | 1705 | if (dev != dev_net(dev)->loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 | 1706 | struct in_device *loopback_idev = |
c346dca1 | 1707 | in_dev_get(dev_net(dev)->loopback_dev); |
1da177e4 LT |
1708 | if (loopback_idev) { |
1709 | rt->idev = loopback_idev; | |
1710 | in_dev_put(idev); | |
1711 | } | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | static void ipv4_link_failure(struct sk_buff *skb) | |
1716 | { | |
1717 | struct rtable *rt; | |
1718 | ||
1719 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1720 | ||
ee6b9673 | 1721 | rt = skb->rtable; |
1da177e4 LT |
1722 | if (rt) |
1723 | dst_set_expires(&rt->u.dst, 0); | |
1724 | } | |
1725 | ||
1726 | static int ip_rt_bug(struct sk_buff *skb) | |
1727 | { | |
673d57e7 HH |
1728 | printk(KERN_DEBUG "ip_rt_bug: %pI4 -> %pI4, %s\n", |
1729 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1da177e4 LT |
1730 | skb->dev ? skb->dev->name : "?"); |
1731 | kfree_skb(skb); | |
1732 | return 0; | |
1733 | } | |
1734 | ||
1735 | /* | |
1736 | We do not cache source address of outgoing interface, | |
1737 | because it is used only by IP RR, TS and SRR options, | |
1738 | so that it out of fast path. | |
1739 | ||
1740 | BTW remember: "addr" is allowed to be not aligned | |
1741 | in IP options! | |
1742 | */ | |
1743 | ||
1744 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1745 | { | |
a61ced5d | 1746 | __be32 src; |
1da177e4 LT |
1747 | struct fib_result res; |
1748 | ||
1749 | if (rt->fl.iif == 0) | |
1750 | src = rt->rt_src; | |
c346dca1 | 1751 | else if (fib_lookup(dev_net(rt->u.dst.dev), &rt->fl, &res) == 0) { |
1da177e4 LT |
1752 | src = FIB_RES_PREFSRC(res); |
1753 | fib_res_put(&res); | |
1754 | } else | |
1755 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1756 | RT_SCOPE_UNIVERSE); | |
1757 | memcpy(addr, &src, 4); | |
1758 | } | |
1759 | ||
1760 | #ifdef CONFIG_NET_CLS_ROUTE | |
1761 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1762 | { | |
1763 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1764 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1765 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1766 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1767 | } | |
1768 | #endif | |
1769 | ||
1770 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1771 | { | |
1772 | struct fib_info *fi = res->fi; | |
1773 | ||
1774 | if (fi) { | |
1775 | if (FIB_RES_GW(*res) && | |
1776 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1777 | rt->rt_gateway = FIB_RES_GW(*res); | |
1778 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1779 | sizeof(rt->u.dst.metrics)); | |
1780 | if (fi->fib_mtu == 0) { | |
1781 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
0bbeafd0 | 1782 | if (dst_metric_locked(&rt->u.dst, RTAX_MTU) && |
1da177e4 LT |
1783 | rt->rt_gateway != rt->rt_dst && |
1784 | rt->u.dst.dev->mtu > 576) | |
1785 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1786 | } | |
1787 | #ifdef CONFIG_NET_CLS_ROUTE | |
1788 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1789 | #endif | |
1790 | } else | |
1791 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1792 | ||
5ffc02a1 | 1793 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1794 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; |
6d273f8d | 1795 | if (dst_mtu(&rt->u.dst) > IP_MAX_MTU) |
1da177e4 | 1796 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; |
5ffc02a1 | 1797 | if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0) |
1da177e4 LT |
1798 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, |
1799 | ip_rt_min_advmss); | |
5ffc02a1 | 1800 | if (dst_metric(&rt->u.dst, RTAX_ADVMSS) > 65535 - 40) |
1da177e4 LT |
1801 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; |
1802 | ||
1803 | #ifdef CONFIG_NET_CLS_ROUTE | |
1804 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1805 | set_class_tag(rt, fib_rules_tclass(res)); | |
1806 | #endif | |
1807 | set_class_tag(rt, itag); | |
1808 | #endif | |
e905a9ed | 1809 | rt->rt_type = res->type; |
1da177e4 LT |
1810 | } |
1811 | ||
9e12bb22 | 1812 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1813 | u8 tos, struct net_device *dev, int our) |
1814 | { | |
1815 | unsigned hash; | |
1816 | struct rtable *rth; | |
a61ced5d | 1817 | __be32 spec_dst; |
1da177e4 LT |
1818 | struct in_device *in_dev = in_dev_get(dev); |
1819 | u32 itag = 0; | |
1820 | ||
1821 | /* Primary sanity checks. */ | |
1822 | ||
1823 | if (in_dev == NULL) | |
1824 | return -EINVAL; | |
1825 | ||
1e637c74 | 1826 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1827 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1828 | goto e_inval; |
1829 | ||
f97c1e0c JP |
1830 | if (ipv4_is_zeronet(saddr)) { |
1831 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1832 | goto e_inval; |
1833 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1834 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1835 | dev, &spec_dst, &itag) < 0) | |
1836 | goto e_inval; | |
1837 | ||
1838 | rth = dst_alloc(&ipv4_dst_ops); | |
1839 | if (!rth) | |
1840 | goto e_nobufs; | |
1841 | ||
1842 | rth->u.dst.output= ip_rt_bug; | |
1843 | ||
1844 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1845 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1846 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1847 | rth->u.dst.flags |= DST_NOPOLICY; |
1848 | rth->fl.fl4_dst = daddr; | |
1849 | rth->rt_dst = daddr; | |
1850 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1851 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1852 | rth->fl.fl4_src = saddr; |
1853 | rth->rt_src = saddr; | |
1854 | #ifdef CONFIG_NET_CLS_ROUTE | |
1855 | rth->u.dst.tclassid = itag; | |
1856 | #endif | |
1857 | rth->rt_iif = | |
1858 | rth->fl.iif = dev->ifindex; | |
2774c7ab | 1859 | rth->u.dst.dev = init_net.loopback_dev; |
1da177e4 LT |
1860 | dev_hold(rth->u.dst.dev); |
1861 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1862 | rth->fl.oif = 0; | |
1863 | rth->rt_gateway = daddr; | |
1864 | rth->rt_spec_dst= spec_dst; | |
e84f84f2 | 1865 | rth->rt_genid = rt_genid(dev_net(dev)); |
1da177e4 | 1866 | rth->rt_flags = RTCF_MULTICAST; |
29e75252 | 1867 | rth->rt_type = RTN_MULTICAST; |
1da177e4 LT |
1868 | if (our) { |
1869 | rth->u.dst.input= ip_local_deliver; | |
1870 | rth->rt_flags |= RTCF_LOCAL; | |
1871 | } | |
1872 | ||
1873 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1874 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
1da177e4 LT |
1875 | rth->u.dst.input = ip_mr_input; |
1876 | #endif | |
1877 | RT_CACHE_STAT_INC(in_slow_mc); | |
1878 | ||
1879 | in_dev_put(in_dev); | |
e84f84f2 | 1880 | hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev))); |
ee6b9673 | 1881 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1882 | |
1883 | e_nobufs: | |
1884 | in_dev_put(in_dev); | |
1885 | return -ENOBUFS; | |
1886 | ||
1887 | e_inval: | |
1888 | in_dev_put(in_dev); | |
1889 | return -EINVAL; | |
1890 | } | |
1891 | ||
1892 | ||
1893 | static void ip_handle_martian_source(struct net_device *dev, | |
1894 | struct in_device *in_dev, | |
1895 | struct sk_buff *skb, | |
9e12bb22 AV |
1896 | __be32 daddr, |
1897 | __be32 saddr) | |
1da177e4 LT |
1898 | { |
1899 | RT_CACHE_STAT_INC(in_martian_src); | |
1900 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1901 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1902 | /* | |
1903 | * RFC1812 recommendation, if source is martian, | |
1904 | * the only hint is MAC header. | |
1905 | */ | |
673d57e7 HH |
1906 | printk(KERN_WARNING "martian source %pI4 from %pI4, on dev %s\n", |
1907 | &daddr, &saddr, dev->name); | |
98e399f8 | 1908 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1909 | int i; |
98e399f8 | 1910 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1911 | printk(KERN_WARNING "ll header: "); |
1912 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1913 | printk("%02x", *p); | |
1914 | if (i < (dev->hard_header_len - 1)) | |
1915 | printk(":"); | |
1916 | } | |
1917 | printk("\n"); | |
1918 | } | |
1919 | } | |
1920 | #endif | |
1921 | } | |
1922 | ||
5969f71d SH |
1923 | static int __mkroute_input(struct sk_buff *skb, |
1924 | struct fib_result *res, | |
1925 | struct in_device *in_dev, | |
1926 | __be32 daddr, __be32 saddr, u32 tos, | |
1927 | struct rtable **result) | |
1da177e4 LT |
1928 | { |
1929 | ||
1930 | struct rtable *rth; | |
1931 | int err; | |
1932 | struct in_device *out_dev; | |
1933 | unsigned flags = 0; | |
d9c9df8c AV |
1934 | __be32 spec_dst; |
1935 | u32 itag; | |
1da177e4 LT |
1936 | |
1937 | /* get a working reference to the output device */ | |
1938 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1939 | if (out_dev == NULL) { | |
1940 | if (net_ratelimit()) | |
1941 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1942 | "_slow(). Please, report\n"); | |
1943 | return -EINVAL; | |
1944 | } | |
1945 | ||
1946 | ||
e905a9ed | 1947 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1948 | in_dev->dev, &spec_dst, &itag); |
1949 | if (err < 0) { | |
e905a9ed | 1950 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1951 | saddr); |
e905a9ed | 1952 | |
1da177e4 LT |
1953 | err = -EINVAL; |
1954 | goto cleanup; | |
1955 | } | |
1956 | ||
1957 | if (err) | |
1958 | flags |= RTCF_DIRECTSRC; | |
1959 | ||
51b77cae | 1960 | if (out_dev == in_dev && err && |
1da177e4 LT |
1961 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1962 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1963 | flags |= RTCF_DOREDIRECT; | |
1964 | ||
1965 | if (skb->protocol != htons(ETH_P_IP)) { | |
1966 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1967 | * invalid for proxy arp. DNAT routes are always valid. | |
1968 | */ | |
cb7928a5 | 1969 | if (out_dev == in_dev) { |
1da177e4 LT |
1970 | err = -EINVAL; |
1971 | goto cleanup; | |
1972 | } | |
1973 | } | |
1974 | ||
1975 | ||
1976 | rth = dst_alloc(&ipv4_dst_ops); | |
1977 | if (!rth) { | |
1978 | err = -ENOBUFS; | |
1979 | goto cleanup; | |
1980 | } | |
1981 | ||
ce723d8e | 1982 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1983 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1984 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1985 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1986 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1987 | rth->u.dst.flags |= DST_NOXFRM; |
1988 | rth->fl.fl4_dst = daddr; | |
1989 | rth->rt_dst = daddr; | |
1990 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1991 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1992 | rth->fl.fl4_src = saddr; |
1993 | rth->rt_src = saddr; | |
1994 | rth->rt_gateway = daddr; | |
1995 | rth->rt_iif = | |
1996 | rth->fl.iif = in_dev->dev->ifindex; | |
1997 | rth->u.dst.dev = (out_dev)->dev; | |
1998 | dev_hold(rth->u.dst.dev); | |
1999 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2000 | rth->fl.oif = 0; | |
2001 | rth->rt_spec_dst= spec_dst; | |
2002 | ||
2003 | rth->u.dst.input = ip_forward; | |
2004 | rth->u.dst.output = ip_output; | |
e84f84f2 | 2005 | rth->rt_genid = rt_genid(dev_net(rth->u.dst.dev)); |
1da177e4 LT |
2006 | |
2007 | rt_set_nexthop(rth, res, itag); | |
2008 | ||
2009 | rth->rt_flags = flags; | |
2010 | ||
2011 | *result = rth; | |
2012 | err = 0; | |
2013 | cleanup: | |
2014 | /* release the working reference to the output device */ | |
2015 | in_dev_put(out_dev); | |
2016 | return err; | |
e905a9ed | 2017 | } |
1da177e4 | 2018 | |
5969f71d SH |
2019 | static int ip_mkroute_input(struct sk_buff *skb, |
2020 | struct fib_result *res, | |
2021 | const struct flowi *fl, | |
2022 | struct in_device *in_dev, | |
2023 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 2024 | { |
7abaa27c | 2025 | struct rtable* rth = NULL; |
1da177e4 LT |
2026 | int err; |
2027 | unsigned hash; | |
2028 | ||
2029 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2030 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
2031 | fib_select_multipath(fl, res); | |
2032 | #endif | |
2033 | ||
2034 | /* create a routing cache entry */ | |
2035 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
2036 | if (err) | |
2037 | return err; | |
1da177e4 LT |
2038 | |
2039 | /* put it into the cache */ | |
e84f84f2 DL |
2040 | hash = rt_hash(daddr, saddr, fl->iif, |
2041 | rt_genid(dev_net(rth->u.dst.dev))); | |
ee6b9673 | 2042 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2043 | } |
2044 | ||
1da177e4 LT |
2045 | /* |
2046 | * NOTE. We drop all the packets that has local source | |
2047 | * addresses, because every properly looped back packet | |
2048 | * must have correct destination already attached by output routine. | |
2049 | * | |
2050 | * Such approach solves two big problems: | |
2051 | * 1. Not simplex devices are handled properly. | |
2052 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
2053 | */ | |
2054 | ||
9e12bb22 | 2055 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2056 | u8 tos, struct net_device *dev) |
2057 | { | |
2058 | struct fib_result res; | |
2059 | struct in_device *in_dev = in_dev_get(dev); | |
2060 | struct flowi fl = { .nl_u = { .ip4_u = | |
2061 | { .daddr = daddr, | |
2062 | .saddr = saddr, | |
2063 | .tos = tos, | |
2064 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 2065 | } }, |
47dcf0cb | 2066 | .mark = skb->mark, |
1da177e4 LT |
2067 | .iif = dev->ifindex }; |
2068 | unsigned flags = 0; | |
2069 | u32 itag = 0; | |
2070 | struct rtable * rth; | |
2071 | unsigned hash; | |
9e12bb22 | 2072 | __be32 spec_dst; |
1da177e4 LT |
2073 | int err = -EINVAL; |
2074 | int free_res = 0; | |
c346dca1 | 2075 | struct net * net = dev_net(dev); |
1da177e4 LT |
2076 | |
2077 | /* IP on this device is disabled. */ | |
2078 | ||
2079 | if (!in_dev) | |
2080 | goto out; | |
2081 | ||
2082 | /* Check for the most weird martians, which can be not detected | |
2083 | by fib_lookup. | |
2084 | */ | |
2085 | ||
1e637c74 | 2086 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 2087 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
2088 | goto martian_source; |
2089 | ||
e448515c | 2090 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2091 | goto brd_input; |
2092 | ||
2093 | /* Accept zero addresses only to limited broadcast; | |
2094 | * I even do not know to fix it or not. Waiting for complains :-) | |
2095 | */ | |
f97c1e0c | 2096 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2097 | goto martian_source; |
2098 | ||
1e637c74 | 2099 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
f97c1e0c | 2100 | ipv4_is_loopback(daddr)) |
1da177e4 LT |
2101 | goto martian_destination; |
2102 | ||
2103 | /* | |
2104 | * Now we are ready to route packet. | |
2105 | */ | |
84a885f4 | 2106 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
1da177e4 | 2107 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 2108 | goto e_hostunreach; |
1da177e4 LT |
2109 | goto no_route; |
2110 | } | |
2111 | free_res = 1; | |
2112 | ||
2113 | RT_CACHE_STAT_INC(in_slow_tot); | |
2114 | ||
2115 | if (res.type == RTN_BROADCAST) | |
2116 | goto brd_input; | |
2117 | ||
2118 | if (res.type == RTN_LOCAL) { | |
2119 | int result; | |
2120 | result = fib_validate_source(saddr, daddr, tos, | |
84a885f4 | 2121 | net->loopback_dev->ifindex, |
1da177e4 LT |
2122 | dev, &spec_dst, &itag); |
2123 | if (result < 0) | |
2124 | goto martian_source; | |
2125 | if (result) | |
2126 | flags |= RTCF_DIRECTSRC; | |
2127 | spec_dst = daddr; | |
2128 | goto local_input; | |
2129 | } | |
2130 | ||
2131 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 2132 | goto e_hostunreach; |
1da177e4 LT |
2133 | if (res.type != RTN_UNICAST) |
2134 | goto martian_destination; | |
2135 | ||
2136 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1da177e4 LT |
2137 | done: |
2138 | in_dev_put(in_dev); | |
2139 | if (free_res) | |
2140 | fib_res_put(&res); | |
2141 | out: return err; | |
2142 | ||
2143 | brd_input: | |
2144 | if (skb->protocol != htons(ETH_P_IP)) | |
2145 | goto e_inval; | |
2146 | ||
f97c1e0c | 2147 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2148 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
2149 | else { | |
2150 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
2151 | &itag); | |
2152 | if (err < 0) | |
2153 | goto martian_source; | |
2154 | if (err) | |
2155 | flags |= RTCF_DIRECTSRC; | |
2156 | } | |
2157 | flags |= RTCF_BROADCAST; | |
2158 | res.type = RTN_BROADCAST; | |
2159 | RT_CACHE_STAT_INC(in_brd); | |
2160 | ||
2161 | local_input: | |
2162 | rth = dst_alloc(&ipv4_dst_ops); | |
2163 | if (!rth) | |
2164 | goto e_nobufs; | |
2165 | ||
2166 | rth->u.dst.output= ip_rt_bug; | |
e84f84f2 | 2167 | rth->rt_genid = rt_genid(net); |
1da177e4 LT |
2168 | |
2169 | atomic_set(&rth->u.dst.__refcnt, 1); | |
2170 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 2171 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2172 | rth->u.dst.flags |= DST_NOPOLICY; |
2173 | rth->fl.fl4_dst = daddr; | |
2174 | rth->rt_dst = daddr; | |
2175 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 2176 | rth->fl.mark = skb->mark; |
1da177e4 LT |
2177 | rth->fl.fl4_src = saddr; |
2178 | rth->rt_src = saddr; | |
2179 | #ifdef CONFIG_NET_CLS_ROUTE | |
2180 | rth->u.dst.tclassid = itag; | |
2181 | #endif | |
2182 | rth->rt_iif = | |
2183 | rth->fl.iif = dev->ifindex; | |
84a885f4 | 2184 | rth->u.dst.dev = net->loopback_dev; |
1da177e4 LT |
2185 | dev_hold(rth->u.dst.dev); |
2186 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2187 | rth->rt_gateway = daddr; | |
2188 | rth->rt_spec_dst= spec_dst; | |
2189 | rth->u.dst.input= ip_local_deliver; | |
2190 | rth->rt_flags = flags|RTCF_LOCAL; | |
2191 | if (res.type == RTN_UNREACHABLE) { | |
2192 | rth->u.dst.input= ip_error; | |
2193 | rth->u.dst.error= -err; | |
2194 | rth->rt_flags &= ~RTCF_LOCAL; | |
2195 | } | |
2196 | rth->rt_type = res.type; | |
e84f84f2 | 2197 | hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net)); |
ee6b9673 | 2198 | err = rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2199 | goto done; |
2200 | ||
2201 | no_route: | |
2202 | RT_CACHE_STAT_INC(in_no_route); | |
2203 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2204 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2205 | if (err == -ESRCH) |
2206 | err = -ENETUNREACH; | |
1da177e4 LT |
2207 | goto local_input; |
2208 | ||
2209 | /* | |
2210 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2211 | */ | |
2212 | martian_destination: | |
2213 | RT_CACHE_STAT_INC(in_martian_dst); | |
2214 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2215 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
673d57e7 HH |
2216 | printk(KERN_WARNING "martian destination %pI4 from %pI4, dev %s\n", |
2217 | &daddr, &saddr, dev->name); | |
1da177e4 | 2218 | #endif |
2c2910a4 DE |
2219 | |
2220 | e_hostunreach: | |
e905a9ed YH |
2221 | err = -EHOSTUNREACH; |
2222 | goto done; | |
2c2910a4 | 2223 | |
1da177e4 LT |
2224 | e_inval: |
2225 | err = -EINVAL; | |
2226 | goto done; | |
2227 | ||
2228 | e_nobufs: | |
2229 | err = -ENOBUFS; | |
2230 | goto done; | |
2231 | ||
2232 | martian_source: | |
2233 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2234 | goto e_inval; | |
2235 | } | |
2236 | ||
9e12bb22 | 2237 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2238 | u8 tos, struct net_device *dev) |
2239 | { | |
2240 | struct rtable * rth; | |
2241 | unsigned hash; | |
2242 | int iif = dev->ifindex; | |
b5921910 | 2243 | struct net *net; |
1da177e4 | 2244 | |
c346dca1 | 2245 | net = dev_net(dev); |
1080d709 NH |
2246 | |
2247 | if (!rt_caching(net)) | |
2248 | goto skip_cache; | |
2249 | ||
1da177e4 | 2250 | tos &= IPTOS_RT_MASK; |
e84f84f2 | 2251 | hash = rt_hash(daddr, saddr, iif, rt_genid(net)); |
1da177e4 LT |
2252 | |
2253 | rcu_read_lock(); | |
2254 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2255 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
c0b8c32b SH |
2256 | if (((rth->fl.fl4_dst ^ daddr) | |
2257 | (rth->fl.fl4_src ^ saddr) | | |
2258 | (rth->fl.iif ^ iif) | | |
2259 | rth->fl.oif | | |
2260 | (rth->fl.fl4_tos ^ tos)) == 0 && | |
47dcf0cb | 2261 | rth->fl.mark == skb->mark && |
878628fb | 2262 | net_eq(dev_net(rth->u.dst.dev), net) && |
e84f84f2 | 2263 | !rt_is_expired(rth)) { |
03f49f34 | 2264 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2265 | RT_CACHE_STAT_INC(in_hit); |
2266 | rcu_read_unlock(); | |
ee6b9673 | 2267 | skb->rtable = rth; |
1da177e4 LT |
2268 | return 0; |
2269 | } | |
2270 | RT_CACHE_STAT_INC(in_hlist_search); | |
2271 | } | |
2272 | rcu_read_unlock(); | |
2273 | ||
1080d709 | 2274 | skip_cache: |
1da177e4 LT |
2275 | /* Multicast recognition logic is moved from route cache to here. |
2276 | The problem was that too many Ethernet cards have broken/missing | |
2277 | hardware multicast filters :-( As result the host on multicasting | |
2278 | network acquires a lot of useless route cache entries, sort of | |
2279 | SDR messages from all the world. Now we try to get rid of them. | |
2280 | Really, provided software IP multicast filter is organized | |
2281 | reasonably (at least, hashed), it does not result in a slowdown | |
2282 | comparing with route cache reject entries. | |
2283 | Note, that multicast routers are not affected, because | |
2284 | route cache entry is created eventually. | |
2285 | */ | |
f97c1e0c | 2286 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
2287 | struct in_device *in_dev; |
2288 | ||
2289 | rcu_read_lock(); | |
e5ed6399 | 2290 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 2291 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 2292 | ip_hdr(skb)->protocol); |
1da177e4 LT |
2293 | if (our |
2294 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c JP |
2295 | || (!ipv4_is_local_multicast(daddr) && |
2296 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 LT |
2297 | #endif |
2298 | ) { | |
2299 | rcu_read_unlock(); | |
2300 | return ip_route_input_mc(skb, daddr, saddr, | |
2301 | tos, dev, our); | |
2302 | } | |
2303 | } | |
2304 | rcu_read_unlock(); | |
2305 | return -EINVAL; | |
2306 | } | |
2307 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2308 | } | |
2309 | ||
5969f71d SH |
2310 | static int __mkroute_output(struct rtable **result, |
2311 | struct fib_result *res, | |
2312 | const struct flowi *fl, | |
2313 | const struct flowi *oldflp, | |
2314 | struct net_device *dev_out, | |
2315 | unsigned flags) | |
1da177e4 LT |
2316 | { |
2317 | struct rtable *rth; | |
2318 | struct in_device *in_dev; | |
2319 | u32 tos = RT_FL_TOS(oldflp); | |
2320 | int err = 0; | |
2321 | ||
f97c1e0c | 2322 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
1da177e4 LT |
2323 | return -EINVAL; |
2324 | ||
e448515c | 2325 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 | 2326 | res->type = RTN_BROADCAST; |
f97c1e0c | 2327 | else if (ipv4_is_multicast(fl->fl4_dst)) |
1da177e4 | 2328 | res->type = RTN_MULTICAST; |
1e637c74 | 2329 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
1da177e4 LT |
2330 | return -EINVAL; |
2331 | ||
2332 | if (dev_out->flags & IFF_LOOPBACK) | |
2333 | flags |= RTCF_LOCAL; | |
2334 | ||
2335 | /* get work reference to inet device */ | |
2336 | in_dev = in_dev_get(dev_out); | |
2337 | if (!in_dev) | |
2338 | return -EINVAL; | |
2339 | ||
2340 | if (res->type == RTN_BROADCAST) { | |
2341 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2342 | if (res->fi) { | |
2343 | fib_info_put(res->fi); | |
2344 | res->fi = NULL; | |
2345 | } | |
2346 | } else if (res->type == RTN_MULTICAST) { | |
2347 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2348 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2349 | oldflp->proto)) |
2350 | flags &= ~RTCF_LOCAL; | |
2351 | /* If multicast route do not exist use | |
2352 | default one, but do not gateway in this case. | |
2353 | Yes, it is hack. | |
2354 | */ | |
2355 | if (res->fi && res->prefixlen < 4) { | |
2356 | fib_info_put(res->fi); | |
2357 | res->fi = NULL; | |
2358 | } | |
2359 | } | |
2360 | ||
2361 | ||
2362 | rth = dst_alloc(&ipv4_dst_ops); | |
2363 | if (!rth) { | |
2364 | err = -ENOBUFS; | |
2365 | goto cleanup; | |
e905a9ed | 2366 | } |
1da177e4 | 2367 | |
ce723d8e | 2368 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2369 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2370 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2371 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2372 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2373 | rth->u.dst.flags |= DST_NOPOLICY; |
2374 | ||
2375 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2376 | rth->fl.fl4_tos = tos; | |
2377 | rth->fl.fl4_src = oldflp->fl4_src; | |
2378 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2379 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2380 | rth->rt_dst = fl->fl4_dst; |
2381 | rth->rt_src = fl->fl4_src; | |
2382 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2383 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2384 | cache entry */ |
2385 | rth->u.dst.dev = dev_out; | |
2386 | dev_hold(dev_out); | |
2387 | rth->idev = in_dev_get(dev_out); | |
2388 | rth->rt_gateway = fl->fl4_dst; | |
2389 | rth->rt_spec_dst= fl->fl4_src; | |
2390 | ||
2391 | rth->u.dst.output=ip_output; | |
e84f84f2 | 2392 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
1da177e4 LT |
2393 | |
2394 | RT_CACHE_STAT_INC(out_slow_tot); | |
2395 | ||
2396 | if (flags & RTCF_LOCAL) { | |
2397 | rth->u.dst.input = ip_local_deliver; | |
2398 | rth->rt_spec_dst = fl->fl4_dst; | |
2399 | } | |
2400 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2401 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2402 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2403 | !(dev_out->flags & IFF_LOOPBACK)) { |
2404 | rth->u.dst.output = ip_mc_output; | |
2405 | RT_CACHE_STAT_INC(out_slow_mc); | |
2406 | } | |
2407 | #ifdef CONFIG_IP_MROUTE | |
2408 | if (res->type == RTN_MULTICAST) { | |
2409 | if (IN_DEV_MFORWARD(in_dev) && | |
f97c1e0c | 2410 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
1da177e4 LT |
2411 | rth->u.dst.input = ip_mr_input; |
2412 | rth->u.dst.output = ip_mc_output; | |
2413 | } | |
2414 | } | |
2415 | #endif | |
2416 | } | |
2417 | ||
2418 | rt_set_nexthop(rth, res, 0); | |
2419 | ||
2420 | rth->rt_flags = flags; | |
2421 | ||
2422 | *result = rth; | |
2423 | cleanup: | |
2424 | /* release work reference to inet device */ | |
2425 | in_dev_put(in_dev); | |
2426 | ||
2427 | return err; | |
2428 | } | |
2429 | ||
5969f71d SH |
2430 | static int ip_mkroute_output(struct rtable **rp, |
2431 | struct fib_result *res, | |
2432 | const struct flowi *fl, | |
2433 | const struct flowi *oldflp, | |
2434 | struct net_device *dev_out, | |
2435 | unsigned flags) | |
1da177e4 | 2436 | { |
7abaa27c | 2437 | struct rtable *rth = NULL; |
1da177e4 LT |
2438 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2439 | unsigned hash; | |
2440 | if (err == 0) { | |
b00180de | 2441 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif, |
e84f84f2 | 2442 | rt_genid(dev_net(dev_out))); |
1da177e4 LT |
2443 | err = rt_intern_hash(hash, rth, rp); |
2444 | } | |
e905a9ed | 2445 | |
1da177e4 LT |
2446 | return err; |
2447 | } | |
2448 | ||
1da177e4 LT |
2449 | /* |
2450 | * Major route resolver routine. | |
2451 | */ | |
2452 | ||
b40afd0e DL |
2453 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
2454 | const struct flowi *oldflp) | |
1da177e4 LT |
2455 | { |
2456 | u32 tos = RT_FL_TOS(oldflp); | |
2457 | struct flowi fl = { .nl_u = { .ip4_u = | |
2458 | { .daddr = oldflp->fl4_dst, | |
2459 | .saddr = oldflp->fl4_src, | |
2460 | .tos = tos & IPTOS_RT_MASK, | |
2461 | .scope = ((tos & RTO_ONLINK) ? | |
2462 | RT_SCOPE_LINK : | |
2463 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2464 | } }, |
47dcf0cb | 2465 | .mark = oldflp->mark, |
b40afd0e | 2466 | .iif = net->loopback_dev->ifindex, |
1da177e4 LT |
2467 | .oif = oldflp->oif }; |
2468 | struct fib_result res; | |
2469 | unsigned flags = 0; | |
2470 | struct net_device *dev_out = NULL; | |
2471 | int free_res = 0; | |
2472 | int err; | |
2473 | ||
2474 | ||
2475 | res.fi = NULL; | |
2476 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2477 | res.r = NULL; | |
2478 | #endif | |
2479 | ||
2480 | if (oldflp->fl4_src) { | |
2481 | err = -EINVAL; | |
f97c1e0c | 2482 | if (ipv4_is_multicast(oldflp->fl4_src) || |
1e637c74 | 2483 | ipv4_is_lbcast(oldflp->fl4_src) || |
f97c1e0c | 2484 | ipv4_is_zeronet(oldflp->fl4_src)) |
1da177e4 LT |
2485 | goto out; |
2486 | ||
1da177e4 LT |
2487 | /* I removed check for oif == dev_out->oif here. |
2488 | It was wrong for two reasons: | |
1ab35276 DL |
2489 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2490 | is assigned to multiple interfaces. | |
1da177e4 LT |
2491 | 2. Moreover, we are allowed to send packets with saddr |
2492 | of another iface. --ANK | |
2493 | */ | |
2494 | ||
f6c5d736 | 2495 | if (oldflp->oif == 0 |
f97c1e0c JP |
2496 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
2497 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { | |
a210d01a JA |
2498 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
2499 | dev_out = ip_dev_find(net, oldflp->fl4_src); | |
2500 | if (dev_out == NULL) | |
2501 | goto out; | |
2502 | ||
1da177e4 LT |
2503 | /* Special hack: user can direct multicasts |
2504 | and limited broadcast via necessary interface | |
2505 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2506 | This hack is not just for fun, it allows | |
2507 | vic,vat and friends to work. | |
2508 | They bind socket to loopback, set ttl to zero | |
2509 | and expect that it will work. | |
2510 | From the viewpoint of routing cache they are broken, | |
2511 | because we are not allowed to build multicast path | |
2512 | with loopback source addr (look, routing cache | |
2513 | cannot know, that ttl is zero, so that packet | |
2514 | will not leave this host and route is valid). | |
2515 | Luckily, this hack is good workaround. | |
2516 | */ | |
2517 | ||
2518 | fl.oif = dev_out->ifindex; | |
2519 | goto make_route; | |
2520 | } | |
a210d01a JA |
2521 | |
2522 | if (!(oldflp->flags & FLOWI_FLAG_ANYSRC)) { | |
2523 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
2524 | dev_out = ip_dev_find(net, oldflp->fl4_src); | |
2525 | if (dev_out == NULL) | |
2526 | goto out; | |
1da177e4 | 2527 | dev_put(dev_out); |
a210d01a JA |
2528 | dev_out = NULL; |
2529 | } | |
1da177e4 LT |
2530 | } |
2531 | ||
2532 | ||
2533 | if (oldflp->oif) { | |
b40afd0e | 2534 | dev_out = dev_get_by_index(net, oldflp->oif); |
1da177e4 LT |
2535 | err = -ENODEV; |
2536 | if (dev_out == NULL) | |
2537 | goto out; | |
e5ed6399 HX |
2538 | |
2539 | /* RACE: Check return value of inet_select_addr instead. */ | |
2540 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2541 | dev_put(dev_out); |
2542 | goto out; /* Wrong error code */ | |
2543 | } | |
2544 | ||
f97c1e0c JP |
2545 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
2546 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { | |
1da177e4 LT |
2547 | if (!fl.fl4_src) |
2548 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2549 | RT_SCOPE_LINK); | |
2550 | goto make_route; | |
2551 | } | |
2552 | if (!fl.fl4_src) { | |
f97c1e0c | 2553 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
1da177e4 LT |
2554 | fl.fl4_src = inet_select_addr(dev_out, 0, |
2555 | fl.fl4_scope); | |
2556 | else if (!oldflp->fl4_dst) | |
2557 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2558 | RT_SCOPE_HOST); | |
2559 | } | |
2560 | } | |
2561 | ||
2562 | if (!fl.fl4_dst) { | |
2563 | fl.fl4_dst = fl.fl4_src; | |
2564 | if (!fl.fl4_dst) | |
2565 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2566 | if (dev_out) | |
2567 | dev_put(dev_out); | |
b40afd0e | 2568 | dev_out = net->loopback_dev; |
1da177e4 | 2569 | dev_hold(dev_out); |
b40afd0e | 2570 | fl.oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2571 | res.type = RTN_LOCAL; |
2572 | flags |= RTCF_LOCAL; | |
2573 | goto make_route; | |
2574 | } | |
2575 | ||
b40afd0e | 2576 | if (fib_lookup(net, &fl, &res)) { |
1da177e4 LT |
2577 | res.fi = NULL; |
2578 | if (oldflp->oif) { | |
2579 | /* Apparently, routing tables are wrong. Assume, | |
2580 | that the destination is on link. | |
2581 | ||
2582 | WHY? DW. | |
2583 | Because we are allowed to send to iface | |
2584 | even if it has NO routes and NO assigned | |
2585 | addresses. When oif is specified, routing | |
2586 | tables are looked up with only one purpose: | |
2587 | to catch if destination is gatewayed, rather than | |
2588 | direct. Moreover, if MSG_DONTROUTE is set, | |
2589 | we send packet, ignoring both routing tables | |
2590 | and ifaddr state. --ANK | |
2591 | ||
2592 | ||
2593 | We could make it even if oif is unknown, | |
2594 | likely IPv6, but we do not. | |
2595 | */ | |
2596 | ||
2597 | if (fl.fl4_src == 0) | |
2598 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2599 | RT_SCOPE_LINK); | |
2600 | res.type = RTN_UNICAST; | |
2601 | goto make_route; | |
2602 | } | |
2603 | if (dev_out) | |
2604 | dev_put(dev_out); | |
2605 | err = -ENETUNREACH; | |
2606 | goto out; | |
2607 | } | |
2608 | free_res = 1; | |
2609 | ||
2610 | if (res.type == RTN_LOCAL) { | |
2611 | if (!fl.fl4_src) | |
2612 | fl.fl4_src = fl.fl4_dst; | |
2613 | if (dev_out) | |
2614 | dev_put(dev_out); | |
b40afd0e | 2615 | dev_out = net->loopback_dev; |
1da177e4 LT |
2616 | dev_hold(dev_out); |
2617 | fl.oif = dev_out->ifindex; | |
2618 | if (res.fi) | |
2619 | fib_info_put(res.fi); | |
2620 | res.fi = NULL; | |
2621 | flags |= RTCF_LOCAL; | |
2622 | goto make_route; | |
2623 | } | |
2624 | ||
2625 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2626 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2627 | fib_select_multipath(&fl, &res); | |
2628 | else | |
2629 | #endif | |
2630 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
b40afd0e | 2631 | fib_select_default(net, &fl, &res); |
1da177e4 LT |
2632 | |
2633 | if (!fl.fl4_src) | |
2634 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2635 | ||
2636 | if (dev_out) | |
2637 | dev_put(dev_out); | |
2638 | dev_out = FIB_RES_DEV(res); | |
2639 | dev_hold(dev_out); | |
2640 | fl.oif = dev_out->ifindex; | |
2641 | ||
2642 | ||
2643 | make_route: | |
2644 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2645 | ||
2646 | ||
2647 | if (free_res) | |
2648 | fib_res_put(&res); | |
2649 | if (dev_out) | |
2650 | dev_put(dev_out); | |
2651 | out: return err; | |
2652 | } | |
2653 | ||
611c183e DL |
2654 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
2655 | const struct flowi *flp) | |
1da177e4 LT |
2656 | { |
2657 | unsigned hash; | |
2658 | struct rtable *rth; | |
2659 | ||
1080d709 NH |
2660 | if (!rt_caching(net)) |
2661 | goto slow_output; | |
2662 | ||
e84f84f2 | 2663 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif, rt_genid(net)); |
1da177e4 LT |
2664 | |
2665 | rcu_read_lock_bh(); | |
2666 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2667 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2668 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2669 | rth->fl.fl4_src == flp->fl4_src && | |
2670 | rth->fl.iif == 0 && | |
2671 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2672 | rth->fl.mark == flp->mark && |
1da177e4 | 2673 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
b5921910 | 2674 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
878628fb | 2675 | net_eq(dev_net(rth->u.dst.dev), net) && |
e84f84f2 | 2676 | !rt_is_expired(rth)) { |
03f49f34 | 2677 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2678 | RT_CACHE_STAT_INC(out_hit); |
2679 | rcu_read_unlock_bh(); | |
2680 | *rp = rth; | |
2681 | return 0; | |
2682 | } | |
2683 | RT_CACHE_STAT_INC(out_hlist_search); | |
2684 | } | |
2685 | rcu_read_unlock_bh(); | |
2686 | ||
1080d709 | 2687 | slow_output: |
611c183e | 2688 | return ip_route_output_slow(net, rp, flp); |
1da177e4 LT |
2689 | } |
2690 | ||
d8c97a94 ACM |
2691 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2692 | ||
14e50e57 DM |
2693 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2694 | { | |
2695 | } | |
2696 | ||
2697 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2698 | .family = AF_INET, | |
2699 | .protocol = __constant_htons(ETH_P_IP), | |
2700 | .destroy = ipv4_dst_destroy, | |
2701 | .check = ipv4_dst_check, | |
2702 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
e2422970 | 2703 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
2704 | }; |
2705 | ||
2706 | ||
e84f84f2 | 2707 | static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi *flp) |
14e50e57 DM |
2708 | { |
2709 | struct rtable *ort = *rp; | |
2710 | struct rtable *rt = (struct rtable *) | |
2711 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2712 | ||
2713 | if (rt) { | |
2714 | struct dst_entry *new = &rt->u.dst; | |
2715 | ||
2716 | atomic_set(&new->__refcnt, 1); | |
2717 | new->__use = 1; | |
352e512c HX |
2718 | new->input = dst_discard; |
2719 | new->output = dst_discard; | |
14e50e57 DM |
2720 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
2721 | ||
2722 | new->dev = ort->u.dst.dev; | |
2723 | if (new->dev) | |
2724 | dev_hold(new->dev); | |
2725 | ||
2726 | rt->fl = ort->fl; | |
2727 | ||
2728 | rt->idev = ort->idev; | |
2729 | if (rt->idev) | |
2730 | in_dev_hold(rt->idev); | |
e84f84f2 | 2731 | rt->rt_genid = rt_genid(net); |
14e50e57 DM |
2732 | rt->rt_flags = ort->rt_flags; |
2733 | rt->rt_type = ort->rt_type; | |
2734 | rt->rt_dst = ort->rt_dst; | |
2735 | rt->rt_src = ort->rt_src; | |
2736 | rt->rt_iif = ort->rt_iif; | |
2737 | rt->rt_gateway = ort->rt_gateway; | |
2738 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2739 | rt->peer = ort->peer; | |
2740 | if (rt->peer) | |
2741 | atomic_inc(&rt->peer->refcnt); | |
2742 | ||
2743 | dst_free(new); | |
2744 | } | |
2745 | ||
2746 | dst_release(&(*rp)->u.dst); | |
2747 | *rp = rt; | |
2748 | return (rt ? 0 : -ENOMEM); | |
2749 | } | |
2750 | ||
f1b050bf DL |
2751 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
2752 | struct sock *sk, int flags) | |
1da177e4 LT |
2753 | { |
2754 | int err; | |
2755 | ||
f1b050bf | 2756 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
1da177e4 LT |
2757 | return err; |
2758 | ||
2759 | if (flp->proto) { | |
2760 | if (!flp->fl4_src) | |
2761 | flp->fl4_src = (*rp)->rt_src; | |
2762 | if (!flp->fl4_dst) | |
2763 | flp->fl4_dst = (*rp)->rt_dst; | |
52479b62 | 2764 | err = __xfrm_lookup(net, (struct dst_entry **)rp, flp, sk, |
bb72845e | 2765 | flags ? XFRM_LOOKUP_WAIT : 0); |
14e50e57 | 2766 | if (err == -EREMOTE) |
e84f84f2 | 2767 | err = ipv4_dst_blackhole(net, rp, flp); |
14e50e57 DM |
2768 | |
2769 | return err; | |
1da177e4 LT |
2770 | } |
2771 | ||
2772 | return 0; | |
2773 | } | |
2774 | ||
d8c97a94 ACM |
2775 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2776 | ||
f206351a | 2777 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
1da177e4 | 2778 | { |
f206351a | 2779 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
1da177e4 LT |
2780 | } |
2781 | ||
2782 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2783 | int nowait, unsigned int flags) |
1da177e4 | 2784 | { |
ee6b9673 | 2785 | struct rtable *rt = skb->rtable; |
1da177e4 | 2786 | struct rtmsg *r; |
be403ea1 | 2787 | struct nlmsghdr *nlh; |
e3703b3d TG |
2788 | long expires; |
2789 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2790 | |
2791 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2792 | if (nlh == NULL) | |
26932566 | 2793 | return -EMSGSIZE; |
be403ea1 TG |
2794 | |
2795 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2796 | r->rtm_family = AF_INET; |
2797 | r->rtm_dst_len = 32; | |
2798 | r->rtm_src_len = 0; | |
2799 | r->rtm_tos = rt->fl.fl4_tos; | |
2800 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2801 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2802 | r->rtm_type = rt->rt_type; |
2803 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2804 | r->rtm_protocol = RTPROT_UNSPEC; | |
2805 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2806 | if (rt->rt_flags & RTCF_NOTIFY) | |
2807 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2808 | |
17fb2c64 | 2809 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2810 | |
1da177e4 LT |
2811 | if (rt->fl.fl4_src) { |
2812 | r->rtm_src_len = 32; | |
17fb2c64 | 2813 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2814 | } |
2815 | if (rt->u.dst.dev) | |
be403ea1 | 2816 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2817 | #ifdef CONFIG_NET_CLS_ROUTE |
2818 | if (rt->u.dst.tclassid) | |
be403ea1 | 2819 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2820 | #endif |
2821 | if (rt->fl.iif) | |
17fb2c64 | 2822 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2823 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2824 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2825 | |
1da177e4 | 2826 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2827 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2828 | |
1da177e4 | 2829 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2830 | goto nla_put_failure; |
2831 | ||
e3703b3d TG |
2832 | error = rt->u.dst.error; |
2833 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2834 | if (rt->peer) { |
e3703b3d | 2835 | id = rt->peer->ip_id_count; |
1da177e4 | 2836 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2837 | ts = rt->peer->tcp_ts; |
9d729f72 | 2838 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2839 | } |
2840 | } | |
be403ea1 | 2841 | |
1da177e4 LT |
2842 | if (rt->fl.iif) { |
2843 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2844 | __be32 dst = rt->rt_dst; |
1da177e4 | 2845 | |
f97c1e0c | 2846 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
586f1211 | 2847 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
1da177e4 LT |
2848 | int err = ipmr_get_route(skb, r, nowait); |
2849 | if (err <= 0) { | |
2850 | if (!nowait) { | |
2851 | if (err == 0) | |
2852 | return 0; | |
be403ea1 | 2853 | goto nla_put_failure; |
1da177e4 LT |
2854 | } else { |
2855 | if (err == -EMSGSIZE) | |
be403ea1 | 2856 | goto nla_put_failure; |
e3703b3d | 2857 | error = err; |
1da177e4 LT |
2858 | } |
2859 | } | |
2860 | } else | |
2861 | #endif | |
be403ea1 | 2862 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2863 | } |
2864 | ||
e3703b3d TG |
2865 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2866 | expires, error) < 0) | |
2867 | goto nla_put_failure; | |
be403ea1 TG |
2868 | |
2869 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2870 | |
be403ea1 | 2871 | nla_put_failure: |
26932566 PM |
2872 | nlmsg_cancel(skb, nlh); |
2873 | return -EMSGSIZE; | |
1da177e4 LT |
2874 | } |
2875 | ||
63f3444f | 2876 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2877 | { |
3b1e0a65 | 2878 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2879 | struct rtmsg *rtm; |
2880 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2881 | struct rtable *rt = NULL; |
9e12bb22 AV |
2882 | __be32 dst = 0; |
2883 | __be32 src = 0; | |
2884 | u32 iif; | |
d889ce3b | 2885 | int err; |
1da177e4 LT |
2886 | struct sk_buff *skb; |
2887 | ||
d889ce3b TG |
2888 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2889 | if (err < 0) | |
2890 | goto errout; | |
2891 | ||
2892 | rtm = nlmsg_data(nlh); | |
2893 | ||
1da177e4 | 2894 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2895 | if (skb == NULL) { |
2896 | err = -ENOBUFS; | |
2897 | goto errout; | |
2898 | } | |
1da177e4 LT |
2899 | |
2900 | /* Reserve room for dummy headers, this skb can pass | |
2901 | through good chunk of routing engine. | |
2902 | */ | |
459a98ed | 2903 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2904 | skb_reset_network_header(skb); |
d2c962b8 SH |
2905 | |
2906 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2907 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2908 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2909 | ||
17fb2c64 AV |
2910 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2911 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2912 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2913 | |
2914 | if (iif) { | |
d889ce3b TG |
2915 | struct net_device *dev; |
2916 | ||
1937504d | 2917 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2918 | if (dev == NULL) { |
2919 | err = -ENODEV; | |
2920 | goto errout_free; | |
2921 | } | |
2922 | ||
1da177e4 LT |
2923 | skb->protocol = htons(ETH_P_IP); |
2924 | skb->dev = dev; | |
2925 | local_bh_disable(); | |
2926 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2927 | local_bh_enable(); | |
d889ce3b | 2928 | |
ee6b9673 | 2929 | rt = skb->rtable; |
d889ce3b | 2930 | if (err == 0 && rt->u.dst.error) |
1da177e4 LT |
2931 | err = -rt->u.dst.error; |
2932 | } else { | |
d889ce3b TG |
2933 | struct flowi fl = { |
2934 | .nl_u = { | |
2935 | .ip4_u = { | |
2936 | .daddr = dst, | |
2937 | .saddr = src, | |
2938 | .tos = rtm->rtm_tos, | |
2939 | }, | |
2940 | }, | |
2941 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2942 | }; | |
1937504d | 2943 | err = ip_route_output_key(net, &rt, &fl); |
1da177e4 | 2944 | } |
d889ce3b | 2945 | |
1da177e4 | 2946 | if (err) |
d889ce3b | 2947 | goto errout_free; |
1da177e4 | 2948 | |
ee6b9673 | 2949 | skb->rtable = rt; |
1da177e4 LT |
2950 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2951 | rt->rt_flags |= RTCF_NOTIFY; | |
2952 | ||
1da177e4 | 2953 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2954 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2955 | if (err <= 0) |
2956 | goto errout_free; | |
1da177e4 | 2957 | |
1937504d | 2958 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2959 | errout: |
2942e900 | 2960 | return err; |
1da177e4 | 2961 | |
d889ce3b | 2962 | errout_free: |
1da177e4 | 2963 | kfree_skb(skb); |
d889ce3b | 2964 | goto errout; |
1da177e4 LT |
2965 | } |
2966 | ||
2967 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2968 | { | |
2969 | struct rtable *rt; | |
2970 | int h, s_h; | |
2971 | int idx, s_idx; | |
1937504d DL |
2972 | struct net *net; |
2973 | ||
3b1e0a65 | 2974 | net = sock_net(skb->sk); |
1da177e4 LT |
2975 | |
2976 | s_h = cb->args[0]; | |
d8c92830 ED |
2977 | if (s_h < 0) |
2978 | s_h = 0; | |
1da177e4 | 2979 | s_idx = idx = cb->args[1]; |
a6272665 ED |
2980 | for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) { |
2981 | if (!rt_hash_table[h].chain) | |
2982 | continue; | |
1da177e4 LT |
2983 | rcu_read_lock_bh(); |
2984 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2985 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
878628fb | 2986 | if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx) |
1da177e4 | 2987 | continue; |
e84f84f2 | 2988 | if (rt_is_expired(rt)) |
29e75252 | 2989 | continue; |
1da177e4 LT |
2990 | skb->dst = dst_clone(&rt->u.dst); |
2991 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 2992 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2993 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
2994 | dst_release(xchg(&skb->dst, NULL)); |
2995 | rcu_read_unlock_bh(); | |
2996 | goto done; | |
2997 | } | |
2998 | dst_release(xchg(&skb->dst, NULL)); | |
2999 | } | |
3000 | rcu_read_unlock_bh(); | |
3001 | } | |
3002 | ||
3003 | done: | |
3004 | cb->args[0] = h; | |
3005 | cb->args[1] = idx; | |
3006 | return skb->len; | |
3007 | } | |
3008 | ||
3009 | void ip_rt_multicast_event(struct in_device *in_dev) | |
3010 | { | |
76e6ebfb | 3011 | rt_cache_flush(dev_net(in_dev->dev), 0); |
1da177e4 LT |
3012 | } |
3013 | ||
3014 | #ifdef CONFIG_SYSCTL | |
81c684d1 | 3015 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
1da177e4 LT |
3016 | struct file *filp, void __user *buffer, |
3017 | size_t *lenp, loff_t *ppos) | |
3018 | { | |
3019 | if (write) { | |
639e104f | 3020 | int flush_delay; |
81c684d1 | 3021 | ctl_table ctl; |
39a23e75 | 3022 | struct net *net; |
639e104f | 3023 | |
81c684d1 DL |
3024 | memcpy(&ctl, __ctl, sizeof(ctl)); |
3025 | ctl.data = &flush_delay; | |
3026 | proc_dointvec(&ctl, write, filp, buffer, lenp, ppos); | |
639e104f | 3027 | |
81c684d1 | 3028 | net = (struct net *)__ctl->extra1; |
39a23e75 | 3029 | rt_cache_flush(net, flush_delay); |
1da177e4 | 3030 | return 0; |
e905a9ed | 3031 | } |
1da177e4 LT |
3032 | |
3033 | return -EINVAL; | |
3034 | } | |
3035 | ||
3036 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
1da177e4 LT |
3037 | void __user *oldval, |
3038 | size_t __user *oldlenp, | |
3039 | void __user *newval, | |
1f29bcd7 | 3040 | size_t newlen) |
1da177e4 LT |
3041 | { |
3042 | int delay; | |
39a23e75 | 3043 | struct net *net; |
1da177e4 LT |
3044 | if (newlen != sizeof(int)) |
3045 | return -EINVAL; | |
3046 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed | 3047 | return -EFAULT; |
39a23e75 DL |
3048 | net = (struct net *)table->extra1; |
3049 | rt_cache_flush(net, delay); | |
1da177e4 LT |
3050 | return 0; |
3051 | } | |
3052 | ||
c6153b5b HX |
3053 | static void rt_secret_reschedule(int old) |
3054 | { | |
3055 | struct net *net; | |
3056 | int new = ip_rt_secret_interval; | |
3057 | int diff = new - old; | |
3058 | ||
3059 | if (!diff) | |
3060 | return; | |
3061 | ||
3062 | rtnl_lock(); | |
3063 | for_each_net(net) { | |
3064 | int deleted = del_timer_sync(&net->ipv4.rt_secret_timer); | |
3065 | ||
3066 | if (!new) | |
3067 | continue; | |
3068 | ||
3069 | if (deleted) { | |
3070 | long time = net->ipv4.rt_secret_timer.expires - jiffies; | |
3071 | ||
3072 | if (time <= 0 || (time += diff) <= 0) | |
3073 | time = 0; | |
3074 | ||
3075 | net->ipv4.rt_secret_timer.expires = time; | |
3076 | } else | |
3077 | net->ipv4.rt_secret_timer.expires = new; | |
3078 | ||
3079 | net->ipv4.rt_secret_timer.expires += jiffies; | |
3080 | add_timer(&net->ipv4.rt_secret_timer); | |
3081 | } | |
3082 | rtnl_unlock(); | |
3083 | } | |
3084 | ||
3085 | static int ipv4_sysctl_rt_secret_interval(ctl_table *ctl, int write, | |
3086 | struct file *filp, | |
3087 | void __user *buffer, size_t *lenp, | |
3088 | loff_t *ppos) | |
3089 | { | |
3090 | int old = ip_rt_secret_interval; | |
3091 | int ret = proc_dointvec_jiffies(ctl, write, filp, buffer, lenp, ppos); | |
3092 | ||
3093 | rt_secret_reschedule(old); | |
3094 | ||
3095 | return ret; | |
3096 | } | |
3097 | ||
3098 | static int ipv4_sysctl_rt_secret_interval_strategy(ctl_table *table, | |
c6153b5b HX |
3099 | void __user *oldval, |
3100 | size_t __user *oldlenp, | |
3101 | void __user *newval, | |
3102 | size_t newlen) | |
3103 | { | |
3104 | int old = ip_rt_secret_interval; | |
f221e726 | 3105 | int ret = sysctl_jiffies(table, oldval, oldlenp, newval, newlen); |
c6153b5b HX |
3106 | |
3107 | rt_secret_reschedule(old); | |
3108 | ||
3109 | return ret; | |
3110 | } | |
3111 | ||
eeb61f71 | 3112 | static ctl_table ipv4_route_table[] = { |
1da177e4 LT |
3113 | { |
3114 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
3115 | .procname = "gc_thresh", | |
3116 | .data = &ipv4_dst_ops.gc_thresh, | |
3117 | .maxlen = sizeof(int), | |
3118 | .mode = 0644, | |
6d9f239a | 3119 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3120 | }, |
3121 | { | |
3122 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
3123 | .procname = "max_size", | |
3124 | .data = &ip_rt_max_size, | |
3125 | .maxlen = sizeof(int), | |
3126 | .mode = 0644, | |
6d9f239a | 3127 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3128 | }, |
3129 | { | |
3130 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 3131 | |
1da177e4 LT |
3132 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
3133 | .procname = "gc_min_interval", | |
3134 | .data = &ip_rt_gc_min_interval, | |
3135 | .maxlen = sizeof(int), | |
3136 | .mode = 0644, | |
6d9f239a AD |
3137 | .proc_handler = proc_dointvec_jiffies, |
3138 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
3139 | }, |
3140 | { | |
3141 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
3142 | .procname = "gc_min_interval_ms", | |
3143 | .data = &ip_rt_gc_min_interval, | |
3144 | .maxlen = sizeof(int), | |
3145 | .mode = 0644, | |
6d9f239a AD |
3146 | .proc_handler = proc_dointvec_ms_jiffies, |
3147 | .strategy = sysctl_ms_jiffies, | |
1da177e4 LT |
3148 | }, |
3149 | { | |
3150 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
3151 | .procname = "gc_timeout", | |
3152 | .data = &ip_rt_gc_timeout, | |
3153 | .maxlen = sizeof(int), | |
3154 | .mode = 0644, | |
6d9f239a AD |
3155 | .proc_handler = proc_dointvec_jiffies, |
3156 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
3157 | }, |
3158 | { | |
3159 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
3160 | .procname = "gc_interval", | |
3161 | .data = &ip_rt_gc_interval, | |
3162 | .maxlen = sizeof(int), | |
3163 | .mode = 0644, | |
6d9f239a AD |
3164 | .proc_handler = proc_dointvec_jiffies, |
3165 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
3166 | }, |
3167 | { | |
3168 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
3169 | .procname = "redirect_load", | |
3170 | .data = &ip_rt_redirect_load, | |
3171 | .maxlen = sizeof(int), | |
3172 | .mode = 0644, | |
6d9f239a | 3173 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3174 | }, |
3175 | { | |
3176 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
3177 | .procname = "redirect_number", | |
3178 | .data = &ip_rt_redirect_number, | |
3179 | .maxlen = sizeof(int), | |
3180 | .mode = 0644, | |
6d9f239a | 3181 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3182 | }, |
3183 | { | |
3184 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
3185 | .procname = "redirect_silence", | |
3186 | .data = &ip_rt_redirect_silence, | |
3187 | .maxlen = sizeof(int), | |
3188 | .mode = 0644, | |
6d9f239a | 3189 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3190 | }, |
3191 | { | |
3192 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
3193 | .procname = "error_cost", | |
3194 | .data = &ip_rt_error_cost, | |
3195 | .maxlen = sizeof(int), | |
3196 | .mode = 0644, | |
6d9f239a | 3197 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3198 | }, |
3199 | { | |
3200 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
3201 | .procname = "error_burst", | |
3202 | .data = &ip_rt_error_burst, | |
3203 | .maxlen = sizeof(int), | |
3204 | .mode = 0644, | |
6d9f239a | 3205 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3206 | }, |
3207 | { | |
3208 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
3209 | .procname = "gc_elasticity", | |
3210 | .data = &ip_rt_gc_elasticity, | |
3211 | .maxlen = sizeof(int), | |
3212 | .mode = 0644, | |
6d9f239a | 3213 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3214 | }, |
3215 | { | |
3216 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
3217 | .procname = "mtu_expires", | |
3218 | .data = &ip_rt_mtu_expires, | |
3219 | .maxlen = sizeof(int), | |
3220 | .mode = 0644, | |
6d9f239a AD |
3221 | .proc_handler = proc_dointvec_jiffies, |
3222 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
3223 | }, |
3224 | { | |
3225 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
3226 | .procname = "min_pmtu", | |
3227 | .data = &ip_rt_min_pmtu, | |
3228 | .maxlen = sizeof(int), | |
3229 | .mode = 0644, | |
6d9f239a | 3230 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3231 | }, |
3232 | { | |
3233 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
3234 | .procname = "min_adv_mss", | |
3235 | .data = &ip_rt_min_advmss, | |
3236 | .maxlen = sizeof(int), | |
3237 | .mode = 0644, | |
6d9f239a | 3238 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3239 | }, |
3240 | { | |
3241 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
3242 | .procname = "secret_interval", | |
3243 | .data = &ip_rt_secret_interval, | |
3244 | .maxlen = sizeof(int), | |
3245 | .mode = 0644, | |
6d9f239a AD |
3246 | .proc_handler = ipv4_sysctl_rt_secret_interval, |
3247 | .strategy = ipv4_sysctl_rt_secret_interval_strategy, | |
1da177e4 LT |
3248 | }, |
3249 | { .ctl_name = 0 } | |
3250 | }; | |
39a23e75 | 3251 | |
2f4520d3 AV |
3252 | static struct ctl_table empty[1]; |
3253 | ||
3254 | static struct ctl_table ipv4_skeleton[] = | |
3255 | { | |
3256 | { .procname = "route", .ctl_name = NET_IPV4_ROUTE, | |
d994af0d | 3257 | .mode = 0555, .child = ipv4_route_table}, |
2f4520d3 | 3258 | { .procname = "neigh", .ctl_name = NET_IPV4_NEIGH, |
d994af0d | 3259 | .mode = 0555, .child = empty}, |
2f4520d3 AV |
3260 | { } |
3261 | }; | |
3262 | ||
3263 | static __net_initdata struct ctl_path ipv4_path[] = { | |
39a23e75 DL |
3264 | { .procname = "net", .ctl_name = CTL_NET, }, |
3265 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
39a23e75 DL |
3266 | { }, |
3267 | }; | |
3268 | ||
39a23e75 DL |
3269 | static struct ctl_table ipv4_route_flush_table[] = { |
3270 | { | |
3271 | .ctl_name = NET_IPV4_ROUTE_FLUSH, | |
3272 | .procname = "flush", | |
3273 | .maxlen = sizeof(int), | |
3274 | .mode = 0200, | |
6d9f239a AD |
3275 | .proc_handler = ipv4_sysctl_rtcache_flush, |
3276 | .strategy = ipv4_sysctl_rtcache_flush_strategy, | |
39a23e75 DL |
3277 | }, |
3278 | { .ctl_name = 0 }, | |
3279 | }; | |
3280 | ||
2f4520d3 AV |
3281 | static __net_initdata struct ctl_path ipv4_route_path[] = { |
3282 | { .procname = "net", .ctl_name = CTL_NET, }, | |
3283 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
3284 | { .procname = "route", .ctl_name = NET_IPV4_ROUTE, }, | |
3285 | { }, | |
3286 | }; | |
3287 | ||
39a23e75 DL |
3288 | static __net_init int sysctl_route_net_init(struct net *net) |
3289 | { | |
3290 | struct ctl_table *tbl; | |
3291 | ||
3292 | tbl = ipv4_route_flush_table; | |
3293 | if (net != &init_net) { | |
3294 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); | |
3295 | if (tbl == NULL) | |
3296 | goto err_dup; | |
3297 | } | |
3298 | tbl[0].extra1 = net; | |
3299 | ||
3300 | net->ipv4.route_hdr = | |
3301 | register_net_sysctl_table(net, ipv4_route_path, tbl); | |
3302 | if (net->ipv4.route_hdr == NULL) | |
3303 | goto err_reg; | |
3304 | return 0; | |
3305 | ||
3306 | err_reg: | |
3307 | if (tbl != ipv4_route_flush_table) | |
3308 | kfree(tbl); | |
3309 | err_dup: | |
3310 | return -ENOMEM; | |
3311 | } | |
3312 | ||
3313 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3314 | { | |
3315 | struct ctl_table *tbl; | |
3316 | ||
3317 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3318 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3319 | BUG_ON(tbl == ipv4_route_flush_table); | |
3320 | kfree(tbl); | |
3321 | } | |
3322 | ||
3323 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3324 | .init = sysctl_route_net_init, | |
3325 | .exit = sysctl_route_net_exit, | |
3326 | }; | |
1da177e4 LT |
3327 | #endif |
3328 | ||
9f5e97e5 DL |
3329 | |
3330 | static __net_init int rt_secret_timer_init(struct net *net) | |
3331 | { | |
e84f84f2 DL |
3332 | atomic_set(&net->ipv4.rt_genid, |
3333 | (int) ((num_physpages ^ (num_physpages>>8)) ^ | |
3334 | (jiffies ^ (jiffies >> 7)))); | |
3335 | ||
9f5e97e5 DL |
3336 | net->ipv4.rt_secret_timer.function = rt_secret_rebuild; |
3337 | net->ipv4.rt_secret_timer.data = (unsigned long)net; | |
3338 | init_timer_deferrable(&net->ipv4.rt_secret_timer); | |
3339 | ||
c6153b5b HX |
3340 | if (ip_rt_secret_interval) { |
3341 | net->ipv4.rt_secret_timer.expires = | |
3342 | jiffies + net_random() % ip_rt_secret_interval + | |
3343 | ip_rt_secret_interval; | |
3344 | add_timer(&net->ipv4.rt_secret_timer); | |
3345 | } | |
9f5e97e5 DL |
3346 | return 0; |
3347 | } | |
3348 | ||
3349 | static __net_exit void rt_secret_timer_exit(struct net *net) | |
3350 | { | |
3351 | del_timer_sync(&net->ipv4.rt_secret_timer); | |
3352 | } | |
3353 | ||
3354 | static __net_initdata struct pernet_operations rt_secret_timer_ops = { | |
3355 | .init = rt_secret_timer_init, | |
3356 | .exit = rt_secret_timer_exit, | |
3357 | }; | |
3358 | ||
3359 | ||
1da177e4 | 3360 | #ifdef CONFIG_NET_CLS_ROUTE |
8dbde28d | 3361 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
1da177e4 LT |
3362 | #endif /* CONFIG_NET_CLS_ROUTE */ |
3363 | ||
3364 | static __initdata unsigned long rhash_entries; | |
3365 | static int __init set_rhash_entries(char *str) | |
3366 | { | |
3367 | if (!str) | |
3368 | return 0; | |
3369 | rhash_entries = simple_strtoul(str, &str, 0); | |
3370 | return 1; | |
3371 | } | |
3372 | __setup("rhash_entries=", set_rhash_entries); | |
3373 | ||
3374 | int __init ip_rt_init(void) | |
3375 | { | |
424c4b70 | 3376 | int rc = 0; |
1da177e4 | 3377 | |
1da177e4 | 3378 | #ifdef CONFIG_NET_CLS_ROUTE |
8dbde28d | 3379 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
1da177e4 LT |
3380 | if (!ip_rt_acct) |
3381 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3382 | #endif |
3383 | ||
e5d679f3 AD |
3384 | ipv4_dst_ops.kmem_cachep = |
3385 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3386 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3387 | |
14e50e57 DM |
3388 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3389 | ||
424c4b70 ED |
3390 | rt_hash_table = (struct rt_hash_bucket *) |
3391 | alloc_large_system_hash("IP route cache", | |
3392 | sizeof(struct rt_hash_bucket), | |
3393 | rhash_entries, | |
3394 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3395 | 15 : 17, |
8d1502de | 3396 | 0, |
424c4b70 ED |
3397 | &rt_hash_log, |
3398 | &rt_hash_mask, | |
3399 | 0); | |
22c047cc ED |
3400 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3401 | rt_hash_lock_init(); | |
1da177e4 LT |
3402 | |
3403 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3404 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3405 | ||
1da177e4 LT |
3406 | devinet_init(); |
3407 | ip_fib_init(); | |
3408 | ||
1da177e4 LT |
3409 | /* All the timers, started at system startup tend |
3410 | to synchronize. Perturb it a bit. | |
3411 | */ | |
39c90ece ED |
3412 | schedule_delayed_work(&expires_work, |
3413 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
1da177e4 | 3414 | |
9f5e97e5 DL |
3415 | if (register_pernet_subsys(&rt_secret_timer_ops)) |
3416 | printk(KERN_ERR "Unable to setup rt_secret_timer\n"); | |
1da177e4 | 3417 | |
73b38711 | 3418 | if (ip_rt_proc_init()) |
107f1634 | 3419 | printk(KERN_ERR "Unable to create route proc files\n"); |
1da177e4 LT |
3420 | #ifdef CONFIG_XFRM |
3421 | xfrm_init(); | |
3422 | xfrm4_init(); | |
3423 | #endif | |
63f3444f TG |
3424 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3425 | ||
39a23e75 DL |
3426 | #ifdef CONFIG_SYSCTL |
3427 | register_pernet_subsys(&sysctl_route_ops); | |
3428 | #endif | |
1da177e4 LT |
3429 | return rc; |
3430 | } | |
3431 | ||
a1bc6eb4 | 3432 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3433 | /* |
3434 | * We really need to sanitize the damn ipv4 init order, then all | |
3435 | * this nonsense will go away. | |
3436 | */ | |
3437 | void __init ip_static_sysctl_init(void) | |
3438 | { | |
2f4520d3 | 3439 | register_sysctl_paths(ipv4_path, ipv4_skeleton); |
eeb61f71 | 3440 | } |
a1bc6eb4 | 3441 | #endif |
eeb61f71 | 3442 | |
1da177e4 LT |
3443 | EXPORT_SYMBOL(__ip_select_ident); |
3444 | EXPORT_SYMBOL(ip_route_input); | |
3445 | EXPORT_SYMBOL(ip_route_output_key); |