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 | * | |
8 | * Version: $Id: route.c,v 1.103 2002/01/12 07:44:09 davem Exp $ | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
13 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
14 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
15 | * | |
16 | * Fixes: | |
17 | * Alan Cox : Verify area fixes. | |
18 | * Alan Cox : cli() protects routing changes | |
19 | * Rui Oliveira : ICMP routing table updates | |
20 | * (rco@di.uminho.pt) Routing table insertion and update | |
21 | * Linus Torvalds : Rewrote bits to be sensible | |
22 | * Alan Cox : Added BSD route gw semantics | |
23 | * Alan Cox : Super /proc >4K | |
24 | * Alan Cox : MTU in route table | |
25 | * Alan Cox : MSS actually. Also added the window | |
26 | * clamper. | |
27 | * Sam Lantinga : Fixed route matching in rt_del() | |
28 | * Alan Cox : Routing cache support. | |
29 | * Alan Cox : Removed compatibility cruft. | |
30 | * Alan Cox : RTF_REJECT support. | |
31 | * Alan Cox : TCP irtt support. | |
32 | * Jonathan Naylor : Added Metric support. | |
33 | * Miquel van Smoorenburg : BSD API fixes. | |
34 | * Miquel van Smoorenburg : Metrics. | |
35 | * Alan Cox : Use __u32 properly | |
36 | * Alan Cox : Aligned routing errors more closely with BSD | |
37 | * our system is still very different. | |
38 | * Alan Cox : Faster /proc handling | |
39 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
40 | * routing caches and better behaviour. | |
41 | * | |
42 | * Olaf Erb : irtt wasn't being copied right. | |
43 | * Bjorn Ekwall : Kerneld route support. | |
44 | * Alan Cox : Multicast fixed (I hope) | |
45 | * Pavel Krauz : Limited broadcast fixed | |
46 | * Mike McLagan : Routing by source | |
47 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
48 | * route.c and rewritten from scratch. | |
49 | * Andi Kleen : Load-limit warning messages. | |
50 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
51 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
52 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
53 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
54 | * Marc Boucher : routing by fwmark | |
55 | * Robert Olsson : Added rt_cache statistics | |
56 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 57 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
58 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
59 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
60 | * |
61 | * This program is free software; you can redistribute it and/or | |
62 | * modify it under the terms of the GNU General Public License | |
63 | * as published by the Free Software Foundation; either version | |
64 | * 2 of the License, or (at your option) any later version. | |
65 | */ | |
66 | ||
67 | #include <linux/config.h> | |
68 | #include <linux/module.h> | |
69 | #include <asm/uaccess.h> | |
70 | #include <asm/system.h> | |
71 | #include <linux/bitops.h> | |
72 | #include <linux/types.h> | |
73 | #include <linux/kernel.h> | |
74 | #include <linux/sched.h> | |
75 | #include <linux/mm.h> | |
424c4b70 | 76 | #include <linux/bootmem.h> |
1da177e4 LT |
77 | #include <linux/string.h> |
78 | #include <linux/socket.h> | |
79 | #include <linux/sockios.h> | |
80 | #include <linux/errno.h> | |
81 | #include <linux/in.h> | |
82 | #include <linux/inet.h> | |
83 | #include <linux/netdevice.h> | |
84 | #include <linux/proc_fs.h> | |
85 | #include <linux/init.h> | |
86 | #include <linux/skbuff.h> | |
87 | #include <linux/rtnetlink.h> | |
88 | #include <linux/inetdevice.h> | |
89 | #include <linux/igmp.h> | |
90 | #include <linux/pkt_sched.h> | |
91 | #include <linux/mroute.h> | |
92 | #include <linux/netfilter_ipv4.h> | |
93 | #include <linux/random.h> | |
94 | #include <linux/jhash.h> | |
95 | #include <linux/rcupdate.h> | |
96 | #include <linux/times.h> | |
97 | #include <net/protocol.h> | |
98 | #include <net/ip.h> | |
99 | #include <net/route.h> | |
100 | #include <net/inetpeer.h> | |
101 | #include <net/sock.h> | |
102 | #include <net/ip_fib.h> | |
103 | #include <net/arp.h> | |
104 | #include <net/tcp.h> | |
105 | #include <net/icmp.h> | |
106 | #include <net/xfrm.h> | |
107 | #include <net/ip_mp_alg.h> | |
108 | #ifdef CONFIG_SYSCTL | |
109 | #include <linux/sysctl.h> | |
110 | #endif | |
111 | ||
112 | #define RT_FL_TOS(oldflp) \ | |
113 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) | |
114 | ||
115 | #define IP_MAX_MTU 0xFFF0 | |
116 | ||
117 | #define RT_GC_TIMEOUT (300*HZ) | |
118 | ||
119 | static int ip_rt_min_delay = 2 * HZ; | |
120 | static int ip_rt_max_delay = 10 * HZ; | |
121 | static int ip_rt_max_size; | |
122 | static int ip_rt_gc_timeout = RT_GC_TIMEOUT; | |
123 | static int ip_rt_gc_interval = 60 * HZ; | |
124 | static int ip_rt_gc_min_interval = HZ / 2; | |
125 | static int ip_rt_redirect_number = 9; | |
126 | static int ip_rt_redirect_load = HZ / 50; | |
127 | static int ip_rt_redirect_silence = ((HZ / 50) << (9 + 1)); | |
128 | static int ip_rt_error_cost = HZ; | |
129 | static int ip_rt_error_burst = 5 * HZ; | |
130 | static int ip_rt_gc_elasticity = 8; | |
131 | static int ip_rt_mtu_expires = 10 * 60 * HZ; | |
132 | static int ip_rt_min_pmtu = 512 + 20 + 20; | |
133 | static int ip_rt_min_advmss = 256; | |
134 | static int ip_rt_secret_interval = 10 * 60 * HZ; | |
135 | static unsigned long rt_deadline; | |
136 | ||
137 | #define RTprint(a...) printk(KERN_DEBUG a) | |
138 | ||
139 | static struct timer_list rt_flush_timer; | |
140 | static struct timer_list rt_periodic_timer; | |
141 | static struct timer_list rt_secret_timer; | |
142 | ||
143 | /* | |
144 | * Interface to generic destination cache. | |
145 | */ | |
146 | ||
147 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
148 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
149 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
150 | struct net_device *dev, int how); | |
151 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
152 | static void ipv4_link_failure(struct sk_buff *skb); | |
153 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
154 | static int rt_garbage_collect(void); | |
155 | ||
156 | ||
157 | static struct dst_ops ipv4_dst_ops = { | |
158 | .family = AF_INET, | |
159 | .protocol = __constant_htons(ETH_P_IP), | |
160 | .gc = rt_garbage_collect, | |
161 | .check = ipv4_dst_check, | |
162 | .destroy = ipv4_dst_destroy, | |
163 | .ifdown = ipv4_dst_ifdown, | |
164 | .negative_advice = ipv4_negative_advice, | |
165 | .link_failure = ipv4_link_failure, | |
166 | .update_pmtu = ip_rt_update_pmtu, | |
167 | .entry_size = sizeof(struct rtable), | |
168 | }; | |
169 | ||
170 | #define ECN_OR_COST(class) TC_PRIO_##class | |
171 | ||
172 | __u8 ip_tos2prio[16] = { | |
173 | TC_PRIO_BESTEFFORT, | |
174 | ECN_OR_COST(FILLER), | |
175 | TC_PRIO_BESTEFFORT, | |
176 | ECN_OR_COST(BESTEFFORT), | |
177 | TC_PRIO_BULK, | |
178 | ECN_OR_COST(BULK), | |
179 | TC_PRIO_BULK, | |
180 | ECN_OR_COST(BULK), | |
181 | TC_PRIO_INTERACTIVE, | |
182 | ECN_OR_COST(INTERACTIVE), | |
183 | TC_PRIO_INTERACTIVE, | |
184 | ECN_OR_COST(INTERACTIVE), | |
185 | TC_PRIO_INTERACTIVE_BULK, | |
186 | ECN_OR_COST(INTERACTIVE_BULK), | |
187 | TC_PRIO_INTERACTIVE_BULK, | |
188 | ECN_OR_COST(INTERACTIVE_BULK) | |
189 | }; | |
190 | ||
191 | ||
192 | /* | |
193 | * Route cache. | |
194 | */ | |
195 | ||
196 | /* The locking scheme is rather straight forward: | |
197 | * | |
198 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
199 | * 2) Only writers remove entries, and they hold the lock | |
200 | * as they look at rtable reference counts. | |
201 | * 3) Only readers acquire references to rtable entries, | |
202 | * they do so with atomic increments and with the | |
203 | * lock held. | |
204 | */ | |
205 | ||
206 | struct rt_hash_bucket { | |
207 | struct rtable *chain; | |
22c047cc ED |
208 | }; |
209 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) | |
210 | /* | |
211 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
212 | * The size of this table is a power of two and depends on the number of CPUS. | |
213 | */ | |
214 | #if NR_CPUS >= 32 | |
215 | #define RT_HASH_LOCK_SZ 4096 | |
216 | #elif NR_CPUS >= 16 | |
217 | #define RT_HASH_LOCK_SZ 2048 | |
218 | #elif NR_CPUS >= 8 | |
219 | #define RT_HASH_LOCK_SZ 1024 | |
220 | #elif NR_CPUS >= 4 | |
221 | #define RT_HASH_LOCK_SZ 512 | |
222 | #else | |
223 | #define RT_HASH_LOCK_SZ 256 | |
224 | #endif | |
225 | ||
226 | static spinlock_t *rt_hash_locks; | |
227 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
228 | # define rt_hash_lock_init() { \ | |
229 | int i; \ | |
230 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, GFP_KERNEL); \ | |
231 | if (!rt_hash_locks) panic("IP: failed to allocate rt_hash_locks\n"); \ | |
232 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) \ | |
233 | spin_lock_init(&rt_hash_locks[i]); \ | |
234 | } | |
235 | #else | |
236 | # define rt_hash_lock_addr(slot) NULL | |
237 | # define rt_hash_lock_init() | |
238 | #endif | |
1da177e4 LT |
239 | |
240 | static struct rt_hash_bucket *rt_hash_table; | |
241 | static unsigned rt_hash_mask; | |
242 | static int rt_hash_log; | |
243 | static unsigned int rt_hash_rnd; | |
244 | ||
2f970d83 | 245 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c AM |
246 | #define RT_CACHE_STAT_INC(field) \ |
247 | (per_cpu(rt_cache_stat, raw_smp_processor_id()).field++) | |
1da177e4 LT |
248 | |
249 | static int rt_intern_hash(unsigned hash, struct rtable *rth, | |
250 | struct rtable **res); | |
251 | ||
cef2685e | 252 | static unsigned int rt_hash_code(u32 daddr, u32 saddr) |
1da177e4 | 253 | { |
cef2685e | 254 | return (jhash_2words(daddr, saddr, rt_hash_rnd) |
1da177e4 LT |
255 | & rt_hash_mask); |
256 | } | |
257 | ||
258 | #ifdef CONFIG_PROC_FS | |
259 | struct rt_cache_iter_state { | |
260 | int bucket; | |
261 | }; | |
262 | ||
263 | static struct rtable *rt_cache_get_first(struct seq_file *seq) | |
264 | { | |
265 | struct rtable *r = NULL; | |
266 | struct rt_cache_iter_state *st = seq->private; | |
267 | ||
268 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
269 | rcu_read_lock_bh(); | |
270 | r = rt_hash_table[st->bucket].chain; | |
271 | if (r) | |
272 | break; | |
273 | rcu_read_unlock_bh(); | |
274 | } | |
275 | return r; | |
276 | } | |
277 | ||
278 | static struct rtable *rt_cache_get_next(struct seq_file *seq, struct rtable *r) | |
279 | { | |
280 | struct rt_cache_iter_state *st = rcu_dereference(seq->private); | |
281 | ||
282 | r = r->u.rt_next; | |
283 | while (!r) { | |
284 | rcu_read_unlock_bh(); | |
285 | if (--st->bucket < 0) | |
286 | break; | |
287 | rcu_read_lock_bh(); | |
288 | r = rt_hash_table[st->bucket].chain; | |
289 | } | |
290 | return r; | |
291 | } | |
292 | ||
293 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) | |
294 | { | |
295 | struct rtable *r = rt_cache_get_first(seq); | |
296 | ||
297 | if (r) | |
298 | while (pos && (r = rt_cache_get_next(seq, r))) | |
299 | --pos; | |
300 | return pos ? NULL : r; | |
301 | } | |
302 | ||
303 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
304 | { | |
305 | return *pos ? rt_cache_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
306 | } | |
307 | ||
308 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
309 | { | |
310 | struct rtable *r = NULL; | |
311 | ||
312 | if (v == SEQ_START_TOKEN) | |
313 | r = rt_cache_get_first(seq); | |
314 | else | |
315 | r = rt_cache_get_next(seq, v); | |
316 | ++*pos; | |
317 | return r; | |
318 | } | |
319 | ||
320 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
321 | { | |
322 | if (v && v != SEQ_START_TOKEN) | |
323 | rcu_read_unlock_bh(); | |
324 | } | |
325 | ||
326 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
327 | { | |
328 | if (v == SEQ_START_TOKEN) | |
329 | seq_printf(seq, "%-127s\n", | |
330 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
331 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
332 | "HHUptod\tSpecDst"); | |
333 | else { | |
334 | struct rtable *r = v; | |
335 | char temp[256]; | |
336 | ||
337 | sprintf(temp, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" | |
338 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X", | |
339 | r->u.dst.dev ? r->u.dst.dev->name : "*", | |
340 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
341 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
342 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
343 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
344 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
345 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
346 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
347 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
348 | r->fl.fl4_tos, | |
349 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
350 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
351 | dev_queue_xmit) : 0, | |
352 | r->rt_spec_dst); | |
353 | seq_printf(seq, "%-127s\n", temp); | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static struct seq_operations rt_cache_seq_ops = { | |
359 | .start = rt_cache_seq_start, | |
360 | .next = rt_cache_seq_next, | |
361 | .stop = rt_cache_seq_stop, | |
362 | .show = rt_cache_seq_show, | |
363 | }; | |
364 | ||
365 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
366 | { | |
367 | struct seq_file *seq; | |
368 | int rc = -ENOMEM; | |
369 | struct rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
370 | ||
371 | if (!s) | |
372 | goto out; | |
373 | rc = seq_open(file, &rt_cache_seq_ops); | |
374 | if (rc) | |
375 | goto out_kfree; | |
376 | seq = file->private_data; | |
377 | seq->private = s; | |
378 | memset(s, 0, sizeof(*s)); | |
379 | out: | |
380 | return rc; | |
381 | out_kfree: | |
382 | kfree(s); | |
383 | goto out; | |
384 | } | |
385 | ||
386 | static struct file_operations rt_cache_seq_fops = { | |
387 | .owner = THIS_MODULE, | |
388 | .open = rt_cache_seq_open, | |
389 | .read = seq_read, | |
390 | .llseek = seq_lseek, | |
391 | .release = seq_release_private, | |
392 | }; | |
393 | ||
394 | ||
395 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
396 | { | |
397 | int cpu; | |
398 | ||
399 | if (*pos == 0) | |
400 | return SEQ_START_TOKEN; | |
401 | ||
402 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
403 | if (!cpu_possible(cpu)) | |
404 | continue; | |
405 | *pos = cpu+1; | |
2f970d83 | 406 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
407 | } |
408 | return NULL; | |
409 | } | |
410 | ||
411 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
412 | { | |
413 | int cpu; | |
414 | ||
415 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
416 | if (!cpu_possible(cpu)) | |
417 | continue; | |
418 | *pos = cpu+1; | |
2f970d83 | 419 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
420 | } |
421 | return NULL; | |
422 | ||
423 | } | |
424 | ||
425 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
426 | { | |
427 | ||
428 | } | |
429 | ||
430 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
431 | { | |
432 | struct rt_cache_stat *st = v; | |
433 | ||
434 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 435 | 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 |
436 | return 0; |
437 | } | |
438 | ||
439 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " | |
440 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
441 | atomic_read(&ipv4_dst_ops.entries), | |
442 | st->in_hit, | |
443 | st->in_slow_tot, | |
444 | st->in_slow_mc, | |
445 | st->in_no_route, | |
446 | st->in_brd, | |
447 | st->in_martian_dst, | |
448 | st->in_martian_src, | |
449 | ||
450 | st->out_hit, | |
451 | st->out_slow_tot, | |
452 | st->out_slow_mc, | |
453 | ||
454 | st->gc_total, | |
455 | st->gc_ignored, | |
456 | st->gc_goal_miss, | |
457 | st->gc_dst_overflow, | |
458 | st->in_hlist_search, | |
459 | st->out_hlist_search | |
460 | ); | |
461 | return 0; | |
462 | } | |
463 | ||
464 | static struct seq_operations rt_cpu_seq_ops = { | |
465 | .start = rt_cpu_seq_start, | |
466 | .next = rt_cpu_seq_next, | |
467 | .stop = rt_cpu_seq_stop, | |
468 | .show = rt_cpu_seq_show, | |
469 | }; | |
470 | ||
471 | ||
472 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
473 | { | |
474 | return seq_open(file, &rt_cpu_seq_ops); | |
475 | } | |
476 | ||
477 | static struct file_operations rt_cpu_seq_fops = { | |
478 | .owner = THIS_MODULE, | |
479 | .open = rt_cpu_seq_open, | |
480 | .read = seq_read, | |
481 | .llseek = seq_lseek, | |
482 | .release = seq_release, | |
483 | }; | |
484 | ||
485 | #endif /* CONFIG_PROC_FS */ | |
486 | ||
487 | static __inline__ void rt_free(struct rtable *rt) | |
488 | { | |
489 | multipath_remove(rt); | |
490 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
491 | } | |
492 | ||
493 | static __inline__ void rt_drop(struct rtable *rt) | |
494 | { | |
495 | multipath_remove(rt); | |
496 | ip_rt_put(rt); | |
497 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
498 | } | |
499 | ||
500 | static __inline__ int rt_fast_clean(struct rtable *rth) | |
501 | { | |
502 | /* Kill broadcast/multicast entries very aggresively, if they | |
503 | collide in hash table with more useful entries */ | |
504 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
505 | rth->fl.iif && rth->u.rt_next; | |
506 | } | |
507 | ||
508 | static __inline__ int rt_valuable(struct rtable *rth) | |
509 | { | |
510 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
511 | rth->u.dst.expires; | |
512 | } | |
513 | ||
514 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
515 | { | |
516 | unsigned long age; | |
517 | int ret = 0; | |
518 | ||
519 | if (atomic_read(&rth->u.dst.__refcnt)) | |
520 | goto out; | |
521 | ||
522 | ret = 1; | |
523 | if (rth->u.dst.expires && | |
524 | time_after_eq(jiffies, rth->u.dst.expires)) | |
525 | goto out; | |
526 | ||
527 | age = jiffies - rth->u.dst.lastuse; | |
528 | ret = 0; | |
529 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
530 | (age <= tmo2 && rt_valuable(rth))) | |
531 | goto out; | |
532 | ret = 1; | |
533 | out: return ret; | |
534 | } | |
535 | ||
536 | /* Bits of score are: | |
537 | * 31: very valuable | |
538 | * 30: not quite useless | |
539 | * 29..0: usage counter | |
540 | */ | |
541 | static inline u32 rt_score(struct rtable *rt) | |
542 | { | |
543 | u32 score = jiffies - rt->u.dst.lastuse; | |
544 | ||
545 | score = ~score & ~(3<<30); | |
546 | ||
547 | if (rt_valuable(rt)) | |
548 | score |= (1<<31); | |
549 | ||
550 | if (!rt->fl.iif || | |
551 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
552 | score |= (1<<30); | |
553 | ||
554 | return score; | |
555 | } | |
556 | ||
557 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
558 | { | |
559 | return memcmp(&fl1->nl_u.ip4_u, &fl2->nl_u.ip4_u, sizeof(fl1->nl_u.ip4_u)) == 0 && | |
560 | fl1->oif == fl2->oif && | |
561 | fl1->iif == fl2->iif; | |
562 | } | |
563 | ||
564 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
565 | static struct rtable **rt_remove_balanced_route(struct rtable **chain_head, | |
566 | struct rtable *expentry, | |
567 | int *removed_count) | |
568 | { | |
569 | int passedexpired = 0; | |
570 | struct rtable **nextstep = NULL; | |
571 | struct rtable **rthp = chain_head; | |
572 | struct rtable *rth; | |
573 | ||
574 | if (removed_count) | |
575 | *removed_count = 0; | |
576 | ||
577 | while ((rth = *rthp) != NULL) { | |
578 | if (rth == expentry) | |
579 | passedexpired = 1; | |
580 | ||
581 | if (((*rthp)->u.dst.flags & DST_BALANCED) != 0 && | |
582 | compare_keys(&(*rthp)->fl, &expentry->fl)) { | |
583 | if (*rthp == expentry) { | |
584 | *rthp = rth->u.rt_next; | |
585 | continue; | |
586 | } else { | |
587 | *rthp = rth->u.rt_next; | |
588 | rt_free(rth); | |
589 | if (removed_count) | |
590 | ++(*removed_count); | |
591 | } | |
592 | } else { | |
593 | if (!((*rthp)->u.dst.flags & DST_BALANCED) && | |
594 | passedexpired && !nextstep) | |
595 | nextstep = &rth->u.rt_next; | |
596 | ||
597 | rthp = &rth->u.rt_next; | |
598 | } | |
599 | } | |
600 | ||
601 | rt_free(expentry); | |
602 | if (removed_count) | |
603 | ++(*removed_count); | |
604 | ||
605 | return nextstep; | |
606 | } | |
607 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
608 | ||
609 | ||
610 | /* This runs via a timer and thus is always in BH context. */ | |
611 | static void rt_check_expire(unsigned long dummy) | |
612 | { | |
bb1d23b0 ED |
613 | static unsigned int rover; |
614 | unsigned int i = rover, goal; | |
1da177e4 LT |
615 | struct rtable *rth, **rthp; |
616 | unsigned long now = jiffies; | |
bb1d23b0 ED |
617 | u64 mult; |
618 | ||
619 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
620 | if (ip_rt_gc_timeout > 1) | |
621 | do_div(mult, ip_rt_gc_timeout); | |
622 | goal = (unsigned int)mult; | |
623 | if (goal > rt_hash_mask) goal = rt_hash_mask + 1; | |
624 | for (; goal > 0; goal--) { | |
1da177e4 LT |
625 | unsigned long tmo = ip_rt_gc_timeout; |
626 | ||
627 | i = (i + 1) & rt_hash_mask; | |
628 | rthp = &rt_hash_table[i].chain; | |
629 | ||
bb1d23b0 ED |
630 | if (*rthp == 0) |
631 | continue; | |
22c047cc | 632 | spin_lock(rt_hash_lock_addr(i)); |
1da177e4 LT |
633 | while ((rth = *rthp) != NULL) { |
634 | if (rth->u.dst.expires) { | |
635 | /* Entry is expired even if it is in use */ | |
636 | if (time_before_eq(now, rth->u.dst.expires)) { | |
637 | tmo >>= 1; | |
638 | rthp = &rth->u.rt_next; | |
639 | continue; | |
640 | } | |
641 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
642 | tmo >>= 1; | |
643 | rthp = &rth->u.rt_next; | |
644 | continue; | |
645 | } | |
646 | ||
647 | /* Cleanup aged off entries. */ | |
648 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
649 | /* remove all related balanced entries if necessary */ | |
650 | if (rth->u.dst.flags & DST_BALANCED) { | |
651 | rthp = rt_remove_balanced_route( | |
652 | &rt_hash_table[i].chain, | |
653 | rth, NULL); | |
654 | if (!rthp) | |
655 | break; | |
656 | } else { | |
657 | *rthp = rth->u.rt_next; | |
658 | rt_free(rth); | |
659 | } | |
660 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
661 | *rthp = rth->u.rt_next; | |
662 | rt_free(rth); | |
663 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
664 | } | |
22c047cc | 665 | spin_unlock(rt_hash_lock_addr(i)); |
1da177e4 LT |
666 | |
667 | /* Fallback loop breaker. */ | |
668 | if (time_after(jiffies, now)) | |
669 | break; | |
670 | } | |
671 | rover = i; | |
bb1d23b0 | 672 | mod_timer(&rt_periodic_timer, jiffies + ip_rt_gc_interval); |
1da177e4 LT |
673 | } |
674 | ||
675 | /* This can run from both BH and non-BH contexts, the latter | |
676 | * in the case of a forced flush event. | |
677 | */ | |
678 | static void rt_run_flush(unsigned long dummy) | |
679 | { | |
680 | int i; | |
681 | struct rtable *rth, *next; | |
682 | ||
683 | rt_deadline = 0; | |
684 | ||
685 | get_random_bytes(&rt_hash_rnd, 4); | |
686 | ||
687 | for (i = rt_hash_mask; i >= 0; i--) { | |
22c047cc | 688 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
689 | rth = rt_hash_table[i].chain; |
690 | if (rth) | |
691 | rt_hash_table[i].chain = NULL; | |
22c047cc | 692 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
693 | |
694 | for (; rth; rth = next) { | |
695 | next = rth->u.rt_next; | |
696 | rt_free(rth); | |
697 | } | |
698 | } | |
699 | } | |
700 | ||
701 | static DEFINE_SPINLOCK(rt_flush_lock); | |
702 | ||
703 | void rt_cache_flush(int delay) | |
704 | { | |
705 | unsigned long now = jiffies; | |
706 | int user_mode = !in_softirq(); | |
707 | ||
708 | if (delay < 0) | |
709 | delay = ip_rt_min_delay; | |
710 | ||
711 | /* flush existing multipath state*/ | |
712 | multipath_flush(); | |
713 | ||
714 | spin_lock_bh(&rt_flush_lock); | |
715 | ||
716 | if (del_timer(&rt_flush_timer) && delay > 0 && rt_deadline) { | |
717 | long tmo = (long)(rt_deadline - now); | |
718 | ||
719 | /* If flush timer is already running | |
720 | and flush request is not immediate (delay > 0): | |
721 | ||
722 | if deadline is not achieved, prolongate timer to "delay", | |
723 | otherwise fire it at deadline time. | |
724 | */ | |
725 | ||
726 | if (user_mode && tmo < ip_rt_max_delay-ip_rt_min_delay) | |
727 | tmo = 0; | |
728 | ||
729 | if (delay > tmo) | |
730 | delay = tmo; | |
731 | } | |
732 | ||
733 | if (delay <= 0) { | |
734 | spin_unlock_bh(&rt_flush_lock); | |
735 | rt_run_flush(0); | |
736 | return; | |
737 | } | |
738 | ||
739 | if (rt_deadline == 0) | |
740 | rt_deadline = now + ip_rt_max_delay; | |
741 | ||
742 | mod_timer(&rt_flush_timer, now+delay); | |
743 | spin_unlock_bh(&rt_flush_lock); | |
744 | } | |
745 | ||
746 | static void rt_secret_rebuild(unsigned long dummy) | |
747 | { | |
748 | unsigned long now = jiffies; | |
749 | ||
750 | rt_cache_flush(0); | |
751 | mod_timer(&rt_secret_timer, now + ip_rt_secret_interval); | |
752 | } | |
753 | ||
754 | /* | |
755 | Short description of GC goals. | |
756 | ||
757 | We want to build algorithm, which will keep routing cache | |
758 | at some equilibrium point, when number of aged off entries | |
759 | is kept approximately equal to newly generated ones. | |
760 | ||
761 | Current expiration strength is variable "expire". | |
762 | We try to adjust it dynamically, so that if networking | |
763 | is idle expires is large enough to keep enough of warm entries, | |
764 | and when load increases it reduces to limit cache size. | |
765 | */ | |
766 | ||
767 | static int rt_garbage_collect(void) | |
768 | { | |
769 | static unsigned long expire = RT_GC_TIMEOUT; | |
770 | static unsigned long last_gc; | |
771 | static int rover; | |
772 | static int equilibrium; | |
773 | struct rtable *rth, **rthp; | |
774 | unsigned long now = jiffies; | |
775 | int goal; | |
776 | ||
777 | /* | |
778 | * Garbage collection is pretty expensive, | |
779 | * do not make it too frequently. | |
780 | */ | |
781 | ||
782 | RT_CACHE_STAT_INC(gc_total); | |
783 | ||
784 | if (now - last_gc < ip_rt_gc_min_interval && | |
785 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
786 | RT_CACHE_STAT_INC(gc_ignored); | |
787 | goto out; | |
788 | } | |
789 | ||
790 | /* Calculate number of entries, which we want to expire now. */ | |
791 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
792 | (ip_rt_gc_elasticity << rt_hash_log); | |
793 | if (goal <= 0) { | |
794 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
795 | equilibrium = ipv4_dst_ops.gc_thresh; | |
796 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
797 | if (goal > 0) { | |
798 | equilibrium += min_t(unsigned int, goal / 2, rt_hash_mask + 1); | |
799 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
800 | } | |
801 | } else { | |
802 | /* We are in dangerous area. Try to reduce cache really | |
803 | * aggressively. | |
804 | */ | |
805 | goal = max_t(unsigned int, goal / 2, rt_hash_mask + 1); | |
806 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; | |
807 | } | |
808 | ||
809 | if (now - last_gc >= ip_rt_gc_min_interval) | |
810 | last_gc = now; | |
811 | ||
812 | if (goal <= 0) { | |
813 | equilibrium += goal; | |
814 | goto work_done; | |
815 | } | |
816 | ||
817 | do { | |
818 | int i, k; | |
819 | ||
820 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
821 | unsigned long tmo = expire; | |
822 | ||
823 | k = (k + 1) & rt_hash_mask; | |
824 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 825 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
826 | while ((rth = *rthp) != NULL) { |
827 | if (!rt_may_expire(rth, tmo, expire)) { | |
828 | tmo >>= 1; | |
829 | rthp = &rth->u.rt_next; | |
830 | continue; | |
831 | } | |
832 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
833 | /* remove all related balanced entries | |
834 | * if necessary | |
835 | */ | |
836 | if (rth->u.dst.flags & DST_BALANCED) { | |
837 | int r; | |
838 | ||
839 | rthp = rt_remove_balanced_route( | |
85259878 | 840 | &rt_hash_table[k].chain, |
1da177e4 LT |
841 | rth, |
842 | &r); | |
843 | goal -= r; | |
844 | if (!rthp) | |
845 | break; | |
846 | } else { | |
847 | *rthp = rth->u.rt_next; | |
848 | rt_free(rth); | |
849 | goal--; | |
850 | } | |
851 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
852 | *rthp = rth->u.rt_next; | |
853 | rt_free(rth); | |
854 | goal--; | |
855 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
856 | } | |
22c047cc | 857 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
858 | if (goal <= 0) |
859 | break; | |
860 | } | |
861 | rover = k; | |
862 | ||
863 | if (goal <= 0) | |
864 | goto work_done; | |
865 | ||
866 | /* Goal is not achieved. We stop process if: | |
867 | ||
868 | - if expire reduced to zero. Otherwise, expire is halfed. | |
869 | - if table is not full. | |
870 | - if we are called from interrupt. | |
871 | - jiffies check is just fallback/debug loop breaker. | |
872 | We will not spin here for long time in any case. | |
873 | */ | |
874 | ||
875 | RT_CACHE_STAT_INC(gc_goal_miss); | |
876 | ||
877 | if (expire == 0) | |
878 | break; | |
879 | ||
880 | expire >>= 1; | |
881 | #if RT_CACHE_DEBUG >= 2 | |
882 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
883 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
884 | #endif | |
885 | ||
886 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
887 | goto out; | |
888 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
889 | ||
890 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
891 | goto out; | |
892 | if (net_ratelimit()) | |
893 | printk(KERN_WARNING "dst cache overflow\n"); | |
894 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
895 | return 1; | |
896 | ||
897 | work_done: | |
898 | expire += ip_rt_gc_min_interval; | |
899 | if (expire > ip_rt_gc_timeout || | |
900 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
901 | expire = ip_rt_gc_timeout; | |
902 | #if RT_CACHE_DEBUG >= 2 | |
903 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
904 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
905 | #endif | |
906 | out: return 0; | |
907 | } | |
908 | ||
909 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
910 | { | |
911 | struct rtable *rth, **rthp; | |
912 | unsigned long now; | |
913 | struct rtable *cand, **candp; | |
914 | u32 min_score; | |
915 | int chain_length; | |
916 | int attempts = !in_softirq(); | |
917 | ||
918 | restart: | |
919 | chain_length = 0; | |
920 | min_score = ~(u32)0; | |
921 | cand = NULL; | |
922 | candp = NULL; | |
923 | now = jiffies; | |
924 | ||
925 | rthp = &rt_hash_table[hash].chain; | |
926 | ||
22c047cc | 927 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
928 | while ((rth = *rthp) != NULL) { |
929 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
930 | if (!(rth->u.dst.flags & DST_BALANCED) && | |
931 | compare_keys(&rth->fl, &rt->fl)) { | |
932 | #else | |
933 | if (compare_keys(&rth->fl, &rt->fl)) { | |
934 | #endif | |
935 | /* Put it first */ | |
936 | *rthp = rth->u.rt_next; | |
937 | /* | |
938 | * Since lookup is lockfree, the deletion | |
939 | * must be visible to another weakly ordered CPU before | |
940 | * the insertion at the start of the hash chain. | |
941 | */ | |
942 | rcu_assign_pointer(rth->u.rt_next, | |
943 | rt_hash_table[hash].chain); | |
944 | /* | |
945 | * Since lookup is lockfree, the update writes | |
946 | * must be ordered for consistency on SMP. | |
947 | */ | |
948 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
949 | ||
950 | rth->u.dst.__use++; | |
951 | dst_hold(&rth->u.dst); | |
952 | rth->u.dst.lastuse = now; | |
22c047cc | 953 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
954 | |
955 | rt_drop(rt); | |
956 | *rp = rth; | |
957 | return 0; | |
958 | } | |
959 | ||
960 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
961 | u32 score = rt_score(rth); | |
962 | ||
963 | if (score <= min_score) { | |
964 | cand = rth; | |
965 | candp = rthp; | |
966 | min_score = score; | |
967 | } | |
968 | } | |
969 | ||
970 | chain_length++; | |
971 | ||
972 | rthp = &rth->u.rt_next; | |
973 | } | |
974 | ||
975 | if (cand) { | |
976 | /* ip_rt_gc_elasticity used to be average length of chain | |
977 | * length, when exceeded gc becomes really aggressive. | |
978 | * | |
979 | * The second limit is less certain. At the moment it allows | |
980 | * only 2 entries per bucket. We will see. | |
981 | */ | |
982 | if (chain_length > ip_rt_gc_elasticity) { | |
983 | *candp = cand->u.rt_next; | |
984 | rt_free(cand); | |
985 | } | |
986 | } | |
987 | ||
988 | /* Try to bind route to arp only if it is output | |
989 | route or unicast forwarding path. | |
990 | */ | |
991 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
992 | int err = arp_bind_neighbour(&rt->u.dst); | |
993 | if (err) { | |
22c047cc | 994 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
995 | |
996 | if (err != -ENOBUFS) { | |
997 | rt_drop(rt); | |
998 | return err; | |
999 | } | |
1000 | ||
1001 | /* Neighbour tables are full and nothing | |
1002 | can be released. Try to shrink route cache, | |
1003 | it is most likely it holds some neighbour records. | |
1004 | */ | |
1005 | if (attempts-- > 0) { | |
1006 | int saved_elasticity = ip_rt_gc_elasticity; | |
1007 | int saved_int = ip_rt_gc_min_interval; | |
1008 | ip_rt_gc_elasticity = 1; | |
1009 | ip_rt_gc_min_interval = 0; | |
1010 | rt_garbage_collect(); | |
1011 | ip_rt_gc_min_interval = saved_int; | |
1012 | ip_rt_gc_elasticity = saved_elasticity; | |
1013 | goto restart; | |
1014 | } | |
1015 | ||
1016 | if (net_ratelimit()) | |
1017 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1018 | rt_drop(rt); | |
1019 | return -ENOBUFS; | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | rt->u.rt_next = rt_hash_table[hash].chain; | |
1024 | #if RT_CACHE_DEBUG >= 2 | |
1025 | if (rt->u.rt_next) { | |
1026 | struct rtable *trt; | |
1027 | printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash, | |
1028 | NIPQUAD(rt->rt_dst)); | |
1029 | for (trt = rt->u.rt_next; trt; trt = trt->u.rt_next) | |
1030 | printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst)); | |
1031 | printk("\n"); | |
1032 | } | |
1033 | #endif | |
1034 | rt_hash_table[hash].chain = rt; | |
22c047cc | 1035 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1036 | *rp = rt; |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | void rt_bind_peer(struct rtable *rt, int create) | |
1041 | { | |
1042 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1043 | struct inet_peer *peer; | |
1044 | ||
1045 | peer = inet_getpeer(rt->rt_dst, create); | |
1046 | ||
1047 | spin_lock_bh(&rt_peer_lock); | |
1048 | if (rt->peer == NULL) { | |
1049 | rt->peer = peer; | |
1050 | peer = NULL; | |
1051 | } | |
1052 | spin_unlock_bh(&rt_peer_lock); | |
1053 | if (peer) | |
1054 | inet_putpeer(peer); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1059 | * we still can generate some output. | |
1060 | * Random ID selection looks a bit dangerous because we have no chances to | |
1061 | * select ID being unique in a reasonable period of time. | |
1062 | * But broken packet identifier may be better than no packet at all. | |
1063 | */ | |
1064 | static void ip_select_fb_ident(struct iphdr *iph) | |
1065 | { | |
1066 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1067 | static u32 ip_fallback_id; | |
1068 | u32 salt; | |
1069 | ||
1070 | spin_lock_bh(&ip_fb_id_lock); | |
1071 | salt = secure_ip_id(ip_fallback_id ^ iph->daddr); | |
1072 | iph->id = htons(salt & 0xFFFF); | |
1073 | ip_fallback_id = salt; | |
1074 | spin_unlock_bh(&ip_fb_id_lock); | |
1075 | } | |
1076 | ||
1077 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1078 | { | |
1079 | struct rtable *rt = (struct rtable *) dst; | |
1080 | ||
1081 | if (rt) { | |
1082 | if (rt->peer == NULL) | |
1083 | rt_bind_peer(rt, 1); | |
1084 | ||
1085 | /* If peer is attached to destination, it is never detached, | |
1086 | so that we need not to grab a lock to dereference it. | |
1087 | */ | |
1088 | if (rt->peer) { | |
1089 | iph->id = htons(inet_getid(rt->peer, more)); | |
1090 | return; | |
1091 | } | |
1092 | } else | |
9c2b3328 SH |
1093 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
1094 | __builtin_return_address(0)); | |
1da177e4 LT |
1095 | |
1096 | ip_select_fb_ident(iph); | |
1097 | } | |
1098 | ||
1099 | static void rt_del(unsigned hash, struct rtable *rt) | |
1100 | { | |
1101 | struct rtable **rthp; | |
1102 | ||
22c047cc | 1103 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1104 | ip_rt_put(rt); |
1105 | for (rthp = &rt_hash_table[hash].chain; *rthp; | |
1106 | rthp = &(*rthp)->u.rt_next) | |
1107 | if (*rthp == rt) { | |
1108 | *rthp = rt->u.rt_next; | |
1109 | rt_free(rt); | |
1110 | break; | |
1111 | } | |
22c047cc | 1112 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | void ip_rt_redirect(u32 old_gw, u32 daddr, u32 new_gw, | |
cef2685e | 1116 | u32 saddr, struct net_device *dev) |
1da177e4 LT |
1117 | { |
1118 | int i, k; | |
1119 | struct in_device *in_dev = in_dev_get(dev); | |
1120 | struct rtable *rth, **rthp; | |
1121 | u32 skeys[2] = { saddr, 0 }; | |
1122 | int ikeys[2] = { dev->ifindex, 0 }; | |
1123 | ||
1da177e4 LT |
1124 | if (!in_dev) |
1125 | return; | |
1126 | ||
1127 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) | |
1128 | || MULTICAST(new_gw) || BADCLASS(new_gw) || ZERONET(new_gw)) | |
1129 | goto reject_redirect; | |
1130 | ||
1131 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1132 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1133 | goto reject_redirect; | |
1134 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1135 | goto reject_redirect; | |
1136 | } else { | |
1137 | if (inet_addr_type(new_gw) != RTN_UNICAST) | |
1138 | goto reject_redirect; | |
1139 | } | |
1140 | ||
1141 | for (i = 0; i < 2; i++) { | |
1142 | for (k = 0; k < 2; k++) { | |
1143 | unsigned hash = rt_hash_code(daddr, | |
cef2685e | 1144 | skeys[i] ^ (ikeys[k] << 5)); |
1da177e4 LT |
1145 | |
1146 | rthp=&rt_hash_table[hash].chain; | |
1147 | ||
1148 | rcu_read_lock(); | |
1149 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1150 | struct rtable *rt; | |
1151 | ||
1152 | if (rth->fl.fl4_dst != daddr || | |
1153 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 LT |
1154 | rth->fl.oif != ikeys[k] || |
1155 | rth->fl.iif != 0) { | |
1156 | rthp = &rth->u.rt_next; | |
1157 | continue; | |
1158 | } | |
1159 | ||
1160 | if (rth->rt_dst != daddr || | |
1161 | rth->rt_src != saddr || | |
1162 | rth->u.dst.error || | |
1163 | rth->rt_gateway != old_gw || | |
1164 | rth->u.dst.dev != dev) | |
1165 | break; | |
1166 | ||
1167 | dst_hold(&rth->u.dst); | |
1168 | rcu_read_unlock(); | |
1169 | ||
1170 | rt = dst_alloc(&ipv4_dst_ops); | |
1171 | if (rt == NULL) { | |
1172 | ip_rt_put(rth); | |
1173 | in_dev_put(in_dev); | |
1174 | return; | |
1175 | } | |
1176 | ||
1177 | /* Copy all the information. */ | |
1178 | *rt = *rth; | |
1179 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); | |
1180 | rt->u.dst.__use = 1; | |
1181 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1182 | rt->u.dst.child = NULL; | |
1183 | if (rt->u.dst.dev) | |
1184 | dev_hold(rt->u.dst.dev); | |
1185 | if (rt->idev) | |
1186 | in_dev_hold(rt->idev); | |
1187 | rt->u.dst.obsolete = 0; | |
1188 | rt->u.dst.lastuse = jiffies; | |
1189 | rt->u.dst.path = &rt->u.dst; | |
1190 | rt->u.dst.neighbour = NULL; | |
1191 | rt->u.dst.hh = NULL; | |
1192 | rt->u.dst.xfrm = NULL; | |
1193 | ||
1194 | rt->rt_flags |= RTCF_REDIRECTED; | |
1195 | ||
1196 | /* Gateway is different ... */ | |
1197 | rt->rt_gateway = new_gw; | |
1198 | ||
1199 | /* Redirect received -> path was valid */ | |
1200 | dst_confirm(&rth->u.dst); | |
1201 | ||
1202 | if (rt->peer) | |
1203 | atomic_inc(&rt->peer->refcnt); | |
1204 | ||
1205 | if (arp_bind_neighbour(&rt->u.dst) || | |
1206 | !(rt->u.dst.neighbour->nud_state & | |
1207 | NUD_VALID)) { | |
1208 | if (rt->u.dst.neighbour) | |
1209 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1210 | ip_rt_put(rth); | |
1211 | rt_drop(rt); | |
1212 | goto do_next; | |
1213 | } | |
1214 | ||
1215 | rt_del(hash, rth); | |
1216 | if (!rt_intern_hash(hash, rt, &rt)) | |
1217 | ip_rt_put(rt); | |
1218 | goto do_next; | |
1219 | } | |
1220 | rcu_read_unlock(); | |
1221 | do_next: | |
1222 | ; | |
1223 | } | |
1224 | } | |
1225 | in_dev_put(in_dev); | |
1226 | return; | |
1227 | ||
1228 | reject_redirect: | |
1229 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1230 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
1231 | printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about " | |
1232 | "%u.%u.%u.%u ignored.\n" | |
cef2685e | 1233 | " Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n", |
1da177e4 | 1234 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1235 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1236 | #endif |
1237 | in_dev_put(in_dev); | |
1238 | } | |
1239 | ||
1240 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1241 | { | |
1242 | struct rtable *rt = (struct rtable*)dst; | |
1243 | struct dst_entry *ret = dst; | |
1244 | ||
1245 | if (rt) { | |
1246 | if (dst->obsolete) { | |
1247 | ip_rt_put(rt); | |
1248 | ret = NULL; | |
1249 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1250 | rt->u.dst.expires) { | |
1251 | unsigned hash = rt_hash_code(rt->fl.fl4_dst, | |
1252 | rt->fl.fl4_src ^ | |
cef2685e | 1253 | (rt->fl.oif << 5)); |
1da177e4 LT |
1254 | #if RT_CACHE_DEBUG >= 1 |
1255 | printk(KERN_DEBUG "ip_rt_advice: redirect to " | |
1256 | "%u.%u.%u.%u/%02x dropped\n", | |
1257 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); | |
1258 | #endif | |
1259 | rt_del(hash, rt); | |
1260 | ret = NULL; | |
1261 | } | |
1262 | } | |
1263 | return ret; | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * Algorithm: | |
1268 | * 1. The first ip_rt_redirect_number redirects are sent | |
1269 | * with exponential backoff, then we stop sending them at all, | |
1270 | * assuming that the host ignores our redirects. | |
1271 | * 2. If we did not see packets requiring redirects | |
1272 | * during ip_rt_redirect_silence, we assume that the host | |
1273 | * forgot redirected route and start to send redirects again. | |
1274 | * | |
1275 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1276 | * in icmp.c. | |
1277 | * | |
1278 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1279 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1280 | */ | |
1281 | ||
1282 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1283 | { | |
1284 | struct rtable *rt = (struct rtable*)skb->dst; | |
1285 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); | |
1286 | ||
1287 | if (!in_dev) | |
1288 | return; | |
1289 | ||
1290 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1291 | goto out; | |
1292 | ||
1293 | /* No redirected packets during ip_rt_redirect_silence; | |
1294 | * reset the algorithm. | |
1295 | */ | |
1296 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1297 | rt->u.dst.rate_tokens = 0; | |
1298 | ||
1299 | /* Too many ignored redirects; do not send anything | |
1300 | * set u.dst.rate_last to the last seen redirected packet. | |
1301 | */ | |
1302 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1303 | rt->u.dst.rate_last = jiffies; | |
1304 | goto out; | |
1305 | } | |
1306 | ||
1307 | /* Check for load limit; set rate_last to the latest sent | |
1308 | * redirect. | |
1309 | */ | |
1310 | if (time_after(jiffies, | |
1311 | (rt->u.dst.rate_last + | |
1312 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1313 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1314 | rt->u.dst.rate_last = jiffies; | |
1315 | ++rt->u.dst.rate_tokens; | |
1316 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1317 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1318 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1319 | net_ratelimit()) | |
1320 | printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores " | |
1321 | "redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n", | |
1322 | NIPQUAD(rt->rt_src), rt->rt_iif, | |
1323 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1324 | #endif | |
1325 | } | |
1326 | out: | |
1327 | in_dev_put(in_dev); | |
1328 | } | |
1329 | ||
1330 | static int ip_error(struct sk_buff *skb) | |
1331 | { | |
1332 | struct rtable *rt = (struct rtable*)skb->dst; | |
1333 | unsigned long now; | |
1334 | int code; | |
1335 | ||
1336 | switch (rt->u.dst.error) { | |
1337 | case EINVAL: | |
1338 | default: | |
1339 | goto out; | |
1340 | case EHOSTUNREACH: | |
1341 | code = ICMP_HOST_UNREACH; | |
1342 | break; | |
1343 | case ENETUNREACH: | |
1344 | code = ICMP_NET_UNREACH; | |
1345 | break; | |
1346 | case EACCES: | |
1347 | code = ICMP_PKT_FILTERED; | |
1348 | break; | |
1349 | } | |
1350 | ||
1351 | now = jiffies; | |
1352 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1353 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1354 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1355 | rt->u.dst.rate_last = now; | |
1356 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1357 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1358 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1359 | } | |
1360 | ||
1361 | out: kfree_skb(skb); | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * The last two values are not from the RFC but | |
1367 | * are needed for AMPRnet AX.25 paths. | |
1368 | */ | |
1369 | ||
9b5b5cff | 1370 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1371 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1372 | ||
1373 | static __inline__ unsigned short guess_mtu(unsigned short old_mtu) | |
1374 | { | |
1375 | int i; | |
1376 | ||
1377 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) | |
1378 | if (old_mtu > mtu_plateau[i]) | |
1379 | return mtu_plateau[i]; | |
1380 | return 68; | |
1381 | } | |
1382 | ||
1383 | unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu) | |
1384 | { | |
1385 | int i; | |
1386 | unsigned short old_mtu = ntohs(iph->tot_len); | |
1387 | struct rtable *rth; | |
1388 | u32 skeys[2] = { iph->saddr, 0, }; | |
1389 | u32 daddr = iph->daddr; | |
1da177e4 LT |
1390 | unsigned short est_mtu = 0; |
1391 | ||
1392 | if (ipv4_config.no_pmtu_disc) | |
1393 | return 0; | |
1394 | ||
1395 | for (i = 0; i < 2; i++) { | |
cef2685e | 1396 | unsigned hash = rt_hash_code(daddr, skeys[i]); |
1da177e4 LT |
1397 | |
1398 | rcu_read_lock(); | |
1399 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
1400 | rth = rcu_dereference(rth->u.rt_next)) { | |
1401 | if (rth->fl.fl4_dst == daddr && | |
1402 | rth->fl.fl4_src == skeys[i] && | |
1403 | rth->rt_dst == daddr && | |
1404 | rth->rt_src == iph->saddr && | |
1da177e4 LT |
1405 | rth->fl.iif == 0 && |
1406 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU))) { | |
1407 | unsigned short mtu = new_mtu; | |
1408 | ||
1409 | if (new_mtu < 68 || new_mtu >= old_mtu) { | |
1410 | ||
1411 | /* BSD 4.2 compatibility hack :-( */ | |
1412 | if (mtu == 0 && | |
1413 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && | |
1414 | old_mtu >= 68 + (iph->ihl << 2)) | |
1415 | old_mtu -= iph->ihl << 2; | |
1416 | ||
1417 | mtu = guess_mtu(old_mtu); | |
1418 | } | |
1419 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { | |
1420 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { | |
1421 | dst_confirm(&rth->u.dst); | |
1422 | if (mtu < ip_rt_min_pmtu) { | |
1423 | mtu = ip_rt_min_pmtu; | |
1424 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1425 | (1 << RTAX_MTU); | |
1426 | } | |
1427 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1428 | dst_set_expires(&rth->u.dst, | |
1429 | ip_rt_mtu_expires); | |
1430 | } | |
1431 | est_mtu = mtu; | |
1432 | } | |
1433 | } | |
1434 | } | |
1435 | rcu_read_unlock(); | |
1436 | } | |
1437 | return est_mtu ? : new_mtu; | |
1438 | } | |
1439 | ||
1440 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1441 | { | |
1442 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && | |
1443 | !(dst_metric_locked(dst, RTAX_MTU))) { | |
1444 | if (mtu < ip_rt_min_pmtu) { | |
1445 | mtu = ip_rt_min_pmtu; | |
1446 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1447 | } | |
1448 | dst->metrics[RTAX_MTU-1] = mtu; | |
1449 | dst_set_expires(dst, ip_rt_mtu_expires); | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1454 | { | |
1455 | return NULL; | |
1456 | } | |
1457 | ||
1458 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1459 | { | |
1460 | struct rtable *rt = (struct rtable *) dst; | |
1461 | struct inet_peer *peer = rt->peer; | |
1462 | struct in_device *idev = rt->idev; | |
1463 | ||
1464 | if (peer) { | |
1465 | rt->peer = NULL; | |
1466 | inet_putpeer(peer); | |
1467 | } | |
1468 | ||
1469 | if (idev) { | |
1470 | rt->idev = NULL; | |
1471 | in_dev_put(idev); | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1476 | int how) | |
1477 | { | |
1478 | struct rtable *rt = (struct rtable *) dst; | |
1479 | struct in_device *idev = rt->idev; | |
1480 | if (dev != &loopback_dev && idev && idev->dev == dev) { | |
1481 | struct in_device *loopback_idev = in_dev_get(&loopback_dev); | |
1482 | if (loopback_idev) { | |
1483 | rt->idev = loopback_idev; | |
1484 | in_dev_put(idev); | |
1485 | } | |
1486 | } | |
1487 | } | |
1488 | ||
1489 | static void ipv4_link_failure(struct sk_buff *skb) | |
1490 | { | |
1491 | struct rtable *rt; | |
1492 | ||
1493 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1494 | ||
1495 | rt = (struct rtable *) skb->dst; | |
1496 | if (rt) | |
1497 | dst_set_expires(&rt->u.dst, 0); | |
1498 | } | |
1499 | ||
1500 | static int ip_rt_bug(struct sk_buff *skb) | |
1501 | { | |
1502 | printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n", | |
1503 | NIPQUAD(skb->nh.iph->saddr), NIPQUAD(skb->nh.iph->daddr), | |
1504 | skb->dev ? skb->dev->name : "?"); | |
1505 | kfree_skb(skb); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | We do not cache source address of outgoing interface, | |
1511 | because it is used only by IP RR, TS and SRR options, | |
1512 | so that it out of fast path. | |
1513 | ||
1514 | BTW remember: "addr" is allowed to be not aligned | |
1515 | in IP options! | |
1516 | */ | |
1517 | ||
1518 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1519 | { | |
1520 | u32 src; | |
1521 | struct fib_result res; | |
1522 | ||
1523 | if (rt->fl.iif == 0) | |
1524 | src = rt->rt_src; | |
1525 | else if (fib_lookup(&rt->fl, &res) == 0) { | |
1526 | src = FIB_RES_PREFSRC(res); | |
1527 | fib_res_put(&res); | |
1528 | } else | |
1529 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1530 | RT_SCOPE_UNIVERSE); | |
1531 | memcpy(addr, &src, 4); | |
1532 | } | |
1533 | ||
1534 | #ifdef CONFIG_NET_CLS_ROUTE | |
1535 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1536 | { | |
1537 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1538 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1539 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1540 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1541 | } | |
1542 | #endif | |
1543 | ||
1544 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1545 | { | |
1546 | struct fib_info *fi = res->fi; | |
1547 | ||
1548 | if (fi) { | |
1549 | if (FIB_RES_GW(*res) && | |
1550 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1551 | rt->rt_gateway = FIB_RES_GW(*res); | |
1552 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1553 | sizeof(rt->u.dst.metrics)); | |
1554 | if (fi->fib_mtu == 0) { | |
1555 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
1556 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && | |
1557 | rt->rt_gateway != rt->rt_dst && | |
1558 | rt->u.dst.dev->mtu > 576) | |
1559 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1560 | } | |
1561 | #ifdef CONFIG_NET_CLS_ROUTE | |
1562 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1563 | #endif | |
1564 | } else | |
1565 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1566 | ||
1567 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1568 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; | |
1569 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) | |
1570 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; | |
1571 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) | |
1572 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, | |
1573 | ip_rt_min_advmss); | |
1574 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) | |
1575 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; | |
1576 | ||
1577 | #ifdef CONFIG_NET_CLS_ROUTE | |
1578 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1579 | set_class_tag(rt, fib_rules_tclass(res)); | |
1580 | #endif | |
1581 | set_class_tag(rt, itag); | |
1582 | #endif | |
1583 | rt->rt_type = res->type; | |
1584 | } | |
1585 | ||
1586 | static int ip_route_input_mc(struct sk_buff *skb, u32 daddr, u32 saddr, | |
1587 | u8 tos, struct net_device *dev, int our) | |
1588 | { | |
1589 | unsigned hash; | |
1590 | struct rtable *rth; | |
1591 | u32 spec_dst; | |
1592 | struct in_device *in_dev = in_dev_get(dev); | |
1593 | u32 itag = 0; | |
1594 | ||
1595 | /* Primary sanity checks. */ | |
1596 | ||
1597 | if (in_dev == NULL) | |
1598 | return -EINVAL; | |
1599 | ||
1600 | if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr) || | |
1601 | skb->protocol != htons(ETH_P_IP)) | |
1602 | goto e_inval; | |
1603 | ||
1604 | if (ZERONET(saddr)) { | |
1605 | if (!LOCAL_MCAST(daddr)) | |
1606 | goto e_inval; | |
1607 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1608 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1609 | dev, &spec_dst, &itag) < 0) | |
1610 | goto e_inval; | |
1611 | ||
1612 | rth = dst_alloc(&ipv4_dst_ops); | |
1613 | if (!rth) | |
1614 | goto e_nobufs; | |
1615 | ||
1616 | rth->u.dst.output= ip_rt_bug; | |
1617 | ||
1618 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1619 | rth->u.dst.flags= DST_HOST; | |
1620 | if (in_dev->cnf.no_policy) | |
1621 | rth->u.dst.flags |= DST_NOPOLICY; | |
1622 | rth->fl.fl4_dst = daddr; | |
1623 | rth->rt_dst = daddr; | |
1624 | rth->fl.fl4_tos = tos; | |
1625 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
1626 | rth->fl.fl4_fwmark= skb->nfmark; | |
1627 | #endif | |
1628 | rth->fl.fl4_src = saddr; | |
1629 | rth->rt_src = saddr; | |
1630 | #ifdef CONFIG_NET_CLS_ROUTE | |
1631 | rth->u.dst.tclassid = itag; | |
1632 | #endif | |
1633 | rth->rt_iif = | |
1634 | rth->fl.iif = dev->ifindex; | |
1635 | rth->u.dst.dev = &loopback_dev; | |
1636 | dev_hold(rth->u.dst.dev); | |
1637 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1638 | rth->fl.oif = 0; | |
1639 | rth->rt_gateway = daddr; | |
1640 | rth->rt_spec_dst= spec_dst; | |
1641 | rth->rt_type = RTN_MULTICAST; | |
1642 | rth->rt_flags = RTCF_MULTICAST; | |
1643 | if (our) { | |
1644 | rth->u.dst.input= ip_local_deliver; | |
1645 | rth->rt_flags |= RTCF_LOCAL; | |
1646 | } | |
1647 | ||
1648 | #ifdef CONFIG_IP_MROUTE | |
1649 | if (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev)) | |
1650 | rth->u.dst.input = ip_mr_input; | |
1651 | #endif | |
1652 | RT_CACHE_STAT_INC(in_slow_mc); | |
1653 | ||
1654 | in_dev_put(in_dev); | |
cef2685e | 1655 | hash = rt_hash_code(daddr, saddr ^ (dev->ifindex << 5)); |
1da177e4 LT |
1656 | return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst); |
1657 | ||
1658 | e_nobufs: | |
1659 | in_dev_put(in_dev); | |
1660 | return -ENOBUFS; | |
1661 | ||
1662 | e_inval: | |
1663 | in_dev_put(in_dev); | |
1664 | return -EINVAL; | |
1665 | } | |
1666 | ||
1667 | ||
1668 | static void ip_handle_martian_source(struct net_device *dev, | |
1669 | struct in_device *in_dev, | |
1670 | struct sk_buff *skb, | |
1671 | u32 daddr, | |
1672 | u32 saddr) | |
1673 | { | |
1674 | RT_CACHE_STAT_INC(in_martian_src); | |
1675 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1676 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1677 | /* | |
1678 | * RFC1812 recommendation, if source is martian, | |
1679 | * the only hint is MAC header. | |
1680 | */ | |
1681 | printk(KERN_WARNING "martian source %u.%u.%u.%u from " | |
1682 | "%u.%u.%u.%u, on dev %s\n", | |
1683 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
0b7f22aa | 1684 | if (dev->hard_header_len && skb->mac.raw) { |
1da177e4 LT |
1685 | int i; |
1686 | unsigned char *p = skb->mac.raw; | |
1687 | printk(KERN_WARNING "ll header: "); | |
1688 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1689 | printk("%02x", *p); | |
1690 | if (i < (dev->hard_header_len - 1)) | |
1691 | printk(":"); | |
1692 | } | |
1693 | printk("\n"); | |
1694 | } | |
1695 | } | |
1696 | #endif | |
1697 | } | |
1698 | ||
1699 | static inline int __mkroute_input(struct sk_buff *skb, | |
1700 | struct fib_result* res, | |
1701 | struct in_device *in_dev, | |
1702 | u32 daddr, u32 saddr, u32 tos, | |
1703 | struct rtable **result) | |
1704 | { | |
1705 | ||
1706 | struct rtable *rth; | |
1707 | int err; | |
1708 | struct in_device *out_dev; | |
1709 | unsigned flags = 0; | |
1710 | u32 spec_dst, itag; | |
1711 | ||
1712 | /* get a working reference to the output device */ | |
1713 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1714 | if (out_dev == NULL) { | |
1715 | if (net_ratelimit()) | |
1716 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1717 | "_slow(). Please, report\n"); | |
1718 | return -EINVAL; | |
1719 | } | |
1720 | ||
1721 | ||
1722 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), | |
1723 | in_dev->dev, &spec_dst, &itag); | |
1724 | if (err < 0) { | |
1725 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, | |
1726 | saddr); | |
1727 | ||
1728 | err = -EINVAL; | |
1729 | goto cleanup; | |
1730 | } | |
1731 | ||
1732 | if (err) | |
1733 | flags |= RTCF_DIRECTSRC; | |
1734 | ||
1735 | if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) && | |
1736 | (IN_DEV_SHARED_MEDIA(out_dev) || | |
1737 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1738 | flags |= RTCF_DOREDIRECT; | |
1739 | ||
1740 | if (skb->protocol != htons(ETH_P_IP)) { | |
1741 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1742 | * invalid for proxy arp. DNAT routes are always valid. | |
1743 | */ | |
1744 | if (out_dev == in_dev && !(flags & RTCF_DNAT)) { | |
1745 | err = -EINVAL; | |
1746 | goto cleanup; | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | ||
1751 | rth = dst_alloc(&ipv4_dst_ops); | |
1752 | if (!rth) { | |
1753 | err = -ENOBUFS; | |
1754 | goto cleanup; | |
1755 | } | |
1756 | ||
ce723d8e | 1757 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 LT |
1758 | rth->u.dst.flags= DST_HOST; |
1759 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
1760 | if (res->fi->fib_nhs > 1) | |
1761 | rth->u.dst.flags |= DST_BALANCED; | |
1762 | #endif | |
1763 | if (in_dev->cnf.no_policy) | |
1764 | rth->u.dst.flags |= DST_NOPOLICY; | |
1765 | if (in_dev->cnf.no_xfrm) | |
1766 | rth->u.dst.flags |= DST_NOXFRM; | |
1767 | rth->fl.fl4_dst = daddr; | |
1768 | rth->rt_dst = daddr; | |
1769 | rth->fl.fl4_tos = tos; | |
1770 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
1771 | rth->fl.fl4_fwmark= skb->nfmark; | |
1772 | #endif | |
1773 | rth->fl.fl4_src = saddr; | |
1774 | rth->rt_src = saddr; | |
1775 | rth->rt_gateway = daddr; | |
1776 | rth->rt_iif = | |
1777 | rth->fl.iif = in_dev->dev->ifindex; | |
1778 | rth->u.dst.dev = (out_dev)->dev; | |
1779 | dev_hold(rth->u.dst.dev); | |
1780 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1781 | rth->fl.oif = 0; | |
1782 | rth->rt_spec_dst= spec_dst; | |
1783 | ||
1784 | rth->u.dst.input = ip_forward; | |
1785 | rth->u.dst.output = ip_output; | |
1786 | ||
1787 | rt_set_nexthop(rth, res, itag); | |
1788 | ||
1789 | rth->rt_flags = flags; | |
1790 | ||
1791 | *result = rth; | |
1792 | err = 0; | |
1793 | cleanup: | |
1794 | /* release the working reference to the output device */ | |
1795 | in_dev_put(out_dev); | |
1796 | return err; | |
1797 | } | |
1798 | ||
1799 | static inline int ip_mkroute_input_def(struct sk_buff *skb, | |
1800 | struct fib_result* res, | |
1801 | const struct flowi *fl, | |
1802 | struct in_device *in_dev, | |
1803 | u32 daddr, u32 saddr, u32 tos) | |
1804 | { | |
7abaa27c | 1805 | struct rtable* rth = NULL; |
1da177e4 LT |
1806 | int err; |
1807 | unsigned hash; | |
1808 | ||
1809 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1810 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
1811 | fib_select_multipath(fl, res); | |
1812 | #endif | |
1813 | ||
1814 | /* create a routing cache entry */ | |
1815 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1816 | if (err) | |
1817 | return err; | |
1da177e4 LT |
1818 | |
1819 | /* put it into the cache */ | |
cef2685e | 1820 | hash = rt_hash_code(daddr, saddr ^ (fl->iif << 5)); |
1da177e4 LT |
1821 | return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
1822 | } | |
1823 | ||
1824 | static inline int ip_mkroute_input(struct sk_buff *skb, | |
1825 | struct fib_result* res, | |
1826 | const struct flowi *fl, | |
1827 | struct in_device *in_dev, | |
1828 | u32 daddr, u32 saddr, u32 tos) | |
1829 | { | |
1830 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
ce723d8e JA |
1831 | struct rtable* rth = NULL, *rtres; |
1832 | unsigned char hop, hopcount; | |
1da177e4 LT |
1833 | int err = -EINVAL; |
1834 | unsigned int hash; | |
1835 | ||
1836 | if (res->fi) | |
1837 | hopcount = res->fi->fib_nhs; | |
1838 | else | |
1839 | hopcount = 1; | |
1840 | ||
1da177e4 LT |
1841 | /* distinguish between multipath and singlepath */ |
1842 | if (hopcount < 2) | |
1843 | return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, | |
1844 | saddr, tos); | |
1845 | ||
1846 | /* add all alternatives to the routing cache */ | |
1847 | for (hop = 0; hop < hopcount; hop++) { | |
1848 | res->nh_sel = hop; | |
1849 | ||
ce723d8e JA |
1850 | /* put reference to previous result */ |
1851 | if (hop) | |
1852 | ip_rt_put(rtres); | |
1853 | ||
1da177e4 LT |
1854 | /* create a routing cache entry */ |
1855 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, | |
1856 | &rth); | |
1857 | if (err) | |
1858 | return err; | |
1859 | ||
1860 | /* put it into the cache */ | |
cef2685e | 1861 | hash = rt_hash_code(daddr, saddr ^ (fl->iif << 5)); |
ce723d8e | 1862 | err = rt_intern_hash(hash, rth, &rtres); |
1da177e4 LT |
1863 | if (err) |
1864 | return err; | |
1865 | ||
1866 | /* forward hop information to multipath impl. */ | |
1867 | multipath_set_nhinfo(rth, | |
1868 | FIB_RES_NETWORK(*res), | |
1869 | FIB_RES_NETMASK(*res), | |
1870 | res->prefixlen, | |
1871 | &FIB_RES_NH(*res)); | |
1da177e4 | 1872 | } |
ce723d8e | 1873 | skb->dst = &rtres->u.dst; |
1da177e4 LT |
1874 | return err; |
1875 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
1876 | return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos); | |
1877 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
1878 | } | |
1879 | ||
1880 | ||
1881 | /* | |
1882 | * NOTE. We drop all the packets that has local source | |
1883 | * addresses, because every properly looped back packet | |
1884 | * must have correct destination already attached by output routine. | |
1885 | * | |
1886 | * Such approach solves two big problems: | |
1887 | * 1. Not simplex devices are handled properly. | |
1888 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
1889 | */ | |
1890 | ||
1891 | static int ip_route_input_slow(struct sk_buff *skb, u32 daddr, u32 saddr, | |
1892 | u8 tos, struct net_device *dev) | |
1893 | { | |
1894 | struct fib_result res; | |
1895 | struct in_device *in_dev = in_dev_get(dev); | |
1896 | struct flowi fl = { .nl_u = { .ip4_u = | |
1897 | { .daddr = daddr, | |
1898 | .saddr = saddr, | |
1899 | .tos = tos, | |
1900 | .scope = RT_SCOPE_UNIVERSE, | |
1901 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
1902 | .fwmark = skb->nfmark | |
1903 | #endif | |
1904 | } }, | |
1905 | .iif = dev->ifindex }; | |
1906 | unsigned flags = 0; | |
1907 | u32 itag = 0; | |
1908 | struct rtable * rth; | |
1909 | unsigned hash; | |
1910 | u32 spec_dst; | |
1911 | int err = -EINVAL; | |
1912 | int free_res = 0; | |
1913 | ||
1914 | /* IP on this device is disabled. */ | |
1915 | ||
1916 | if (!in_dev) | |
1917 | goto out; | |
1918 | ||
1919 | /* Check for the most weird martians, which can be not detected | |
1920 | by fib_lookup. | |
1921 | */ | |
1922 | ||
1923 | if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr)) | |
1924 | goto martian_source; | |
1925 | ||
1926 | if (daddr == 0xFFFFFFFF || (saddr == 0 && daddr == 0)) | |
1927 | goto brd_input; | |
1928 | ||
1929 | /* Accept zero addresses only to limited broadcast; | |
1930 | * I even do not know to fix it or not. Waiting for complains :-) | |
1931 | */ | |
1932 | if (ZERONET(saddr)) | |
1933 | goto martian_source; | |
1934 | ||
1935 | if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr)) | |
1936 | goto martian_destination; | |
1937 | ||
1938 | /* | |
1939 | * Now we are ready to route packet. | |
1940 | */ | |
1941 | if ((err = fib_lookup(&fl, &res)) != 0) { | |
1942 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1943 | goto e_hostunreach; |
1da177e4 LT |
1944 | goto no_route; |
1945 | } | |
1946 | free_res = 1; | |
1947 | ||
1948 | RT_CACHE_STAT_INC(in_slow_tot); | |
1949 | ||
1950 | if (res.type == RTN_BROADCAST) | |
1951 | goto brd_input; | |
1952 | ||
1953 | if (res.type == RTN_LOCAL) { | |
1954 | int result; | |
1955 | result = fib_validate_source(saddr, daddr, tos, | |
1956 | loopback_dev.ifindex, | |
1957 | dev, &spec_dst, &itag); | |
1958 | if (result < 0) | |
1959 | goto martian_source; | |
1960 | if (result) | |
1961 | flags |= RTCF_DIRECTSRC; | |
1962 | spec_dst = daddr; | |
1963 | goto local_input; | |
1964 | } | |
1965 | ||
1966 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1967 | goto e_hostunreach; |
1da177e4 LT |
1968 | if (res.type != RTN_UNICAST) |
1969 | goto martian_destination; | |
1970 | ||
1971 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1972 | if (err == -ENOBUFS) | |
1973 | goto e_nobufs; | |
1974 | if (err == -EINVAL) | |
1975 | goto e_inval; | |
1976 | ||
1977 | done: | |
1978 | in_dev_put(in_dev); | |
1979 | if (free_res) | |
1980 | fib_res_put(&res); | |
1981 | out: return err; | |
1982 | ||
1983 | brd_input: | |
1984 | if (skb->protocol != htons(ETH_P_IP)) | |
1985 | goto e_inval; | |
1986 | ||
1987 | if (ZERONET(saddr)) | |
1988 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1989 | else { | |
1990 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
1991 | &itag); | |
1992 | if (err < 0) | |
1993 | goto martian_source; | |
1994 | if (err) | |
1995 | flags |= RTCF_DIRECTSRC; | |
1996 | } | |
1997 | flags |= RTCF_BROADCAST; | |
1998 | res.type = RTN_BROADCAST; | |
1999 | RT_CACHE_STAT_INC(in_brd); | |
2000 | ||
2001 | local_input: | |
2002 | rth = dst_alloc(&ipv4_dst_ops); | |
2003 | if (!rth) | |
2004 | goto e_nobufs; | |
2005 | ||
2006 | rth->u.dst.output= ip_rt_bug; | |
2007 | ||
2008 | atomic_set(&rth->u.dst.__refcnt, 1); | |
2009 | rth->u.dst.flags= DST_HOST; | |
2010 | if (in_dev->cnf.no_policy) | |
2011 | rth->u.dst.flags |= DST_NOPOLICY; | |
2012 | rth->fl.fl4_dst = daddr; | |
2013 | rth->rt_dst = daddr; | |
2014 | rth->fl.fl4_tos = tos; | |
2015 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
2016 | rth->fl.fl4_fwmark= skb->nfmark; | |
2017 | #endif | |
2018 | rth->fl.fl4_src = saddr; | |
2019 | rth->rt_src = saddr; | |
2020 | #ifdef CONFIG_NET_CLS_ROUTE | |
2021 | rth->u.dst.tclassid = itag; | |
2022 | #endif | |
2023 | rth->rt_iif = | |
2024 | rth->fl.iif = dev->ifindex; | |
2025 | rth->u.dst.dev = &loopback_dev; | |
2026 | dev_hold(rth->u.dst.dev); | |
2027 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2028 | rth->rt_gateway = daddr; | |
2029 | rth->rt_spec_dst= spec_dst; | |
2030 | rth->u.dst.input= ip_local_deliver; | |
2031 | rth->rt_flags = flags|RTCF_LOCAL; | |
2032 | if (res.type == RTN_UNREACHABLE) { | |
2033 | rth->u.dst.input= ip_error; | |
2034 | rth->u.dst.error= -err; | |
2035 | rth->rt_flags &= ~RTCF_LOCAL; | |
2036 | } | |
2037 | rth->rt_type = res.type; | |
cef2685e | 2038 | hash = rt_hash_code(daddr, saddr ^ (fl.iif << 5)); |
1da177e4 LT |
2039 | err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
2040 | goto done; | |
2041 | ||
2042 | no_route: | |
2043 | RT_CACHE_STAT_INC(in_no_route); | |
2044 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2045 | res.type = RTN_UNREACHABLE; | |
2046 | goto local_input; | |
2047 | ||
2048 | /* | |
2049 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2050 | */ | |
2051 | martian_destination: | |
2052 | RT_CACHE_STAT_INC(in_martian_dst); | |
2053 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2054 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
2055 | printk(KERN_WARNING "martian destination %u.%u.%u.%u from " | |
2056 | "%u.%u.%u.%u, dev %s\n", | |
2057 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
2058 | #endif | |
2c2910a4 DE |
2059 | |
2060 | e_hostunreach: | |
2061 | err = -EHOSTUNREACH; | |
2062 | goto done; | |
2063 | ||
1da177e4 LT |
2064 | e_inval: |
2065 | err = -EINVAL; | |
2066 | goto done; | |
2067 | ||
2068 | e_nobufs: | |
2069 | err = -ENOBUFS; | |
2070 | goto done; | |
2071 | ||
2072 | martian_source: | |
2073 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2074 | goto e_inval; | |
2075 | } | |
2076 | ||
2077 | int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr, | |
2078 | u8 tos, struct net_device *dev) | |
2079 | { | |
2080 | struct rtable * rth; | |
2081 | unsigned hash; | |
2082 | int iif = dev->ifindex; | |
2083 | ||
2084 | tos &= IPTOS_RT_MASK; | |
cef2685e | 2085 | hash = rt_hash_code(daddr, saddr ^ (iif << 5)); |
1da177e4 LT |
2086 | |
2087 | rcu_read_lock(); | |
2088 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
2089 | rth = rcu_dereference(rth->u.rt_next)) { | |
2090 | if (rth->fl.fl4_dst == daddr && | |
2091 | rth->fl.fl4_src == saddr && | |
2092 | rth->fl.iif == iif && | |
2093 | rth->fl.oif == 0 && | |
2094 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
2095 | rth->fl.fl4_fwmark == skb->nfmark && | |
2096 | #endif | |
2097 | rth->fl.fl4_tos == tos) { | |
2098 | rth->u.dst.lastuse = jiffies; | |
2099 | dst_hold(&rth->u.dst); | |
2100 | rth->u.dst.__use++; | |
2101 | RT_CACHE_STAT_INC(in_hit); | |
2102 | rcu_read_unlock(); | |
2103 | skb->dst = (struct dst_entry*)rth; | |
2104 | return 0; | |
2105 | } | |
2106 | RT_CACHE_STAT_INC(in_hlist_search); | |
2107 | } | |
2108 | rcu_read_unlock(); | |
2109 | ||
2110 | /* Multicast recognition logic is moved from route cache to here. | |
2111 | The problem was that too many Ethernet cards have broken/missing | |
2112 | hardware multicast filters :-( As result the host on multicasting | |
2113 | network acquires a lot of useless route cache entries, sort of | |
2114 | SDR messages from all the world. Now we try to get rid of them. | |
2115 | Really, provided software IP multicast filter is organized | |
2116 | reasonably (at least, hashed), it does not result in a slowdown | |
2117 | comparing with route cache reject entries. | |
2118 | Note, that multicast routers are not affected, because | |
2119 | route cache entry is created eventually. | |
2120 | */ | |
2121 | if (MULTICAST(daddr)) { | |
2122 | struct in_device *in_dev; | |
2123 | ||
2124 | rcu_read_lock(); | |
e5ed6399 | 2125 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 LT |
2126 | int our = ip_check_mc(in_dev, daddr, saddr, |
2127 | skb->nh.iph->protocol); | |
2128 | if (our | |
2129 | #ifdef CONFIG_IP_MROUTE | |
2130 | || (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev)) | |
2131 | #endif | |
2132 | ) { | |
2133 | rcu_read_unlock(); | |
2134 | return ip_route_input_mc(skb, daddr, saddr, | |
2135 | tos, dev, our); | |
2136 | } | |
2137 | } | |
2138 | rcu_read_unlock(); | |
2139 | return -EINVAL; | |
2140 | } | |
2141 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2142 | } | |
2143 | ||
2144 | static inline int __mkroute_output(struct rtable **result, | |
2145 | struct fib_result* res, | |
2146 | const struct flowi *fl, | |
2147 | const struct flowi *oldflp, | |
2148 | struct net_device *dev_out, | |
2149 | unsigned flags) | |
2150 | { | |
2151 | struct rtable *rth; | |
2152 | struct in_device *in_dev; | |
2153 | u32 tos = RT_FL_TOS(oldflp); | |
2154 | int err = 0; | |
2155 | ||
2156 | if (LOOPBACK(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) | |
2157 | return -EINVAL; | |
2158 | ||
2159 | if (fl->fl4_dst == 0xFFFFFFFF) | |
2160 | res->type = RTN_BROADCAST; | |
2161 | else if (MULTICAST(fl->fl4_dst)) | |
2162 | res->type = RTN_MULTICAST; | |
2163 | else if (BADCLASS(fl->fl4_dst) || ZERONET(fl->fl4_dst)) | |
2164 | return -EINVAL; | |
2165 | ||
2166 | if (dev_out->flags & IFF_LOOPBACK) | |
2167 | flags |= RTCF_LOCAL; | |
2168 | ||
2169 | /* get work reference to inet device */ | |
2170 | in_dev = in_dev_get(dev_out); | |
2171 | if (!in_dev) | |
2172 | return -EINVAL; | |
2173 | ||
2174 | if (res->type == RTN_BROADCAST) { | |
2175 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2176 | if (res->fi) { | |
2177 | fib_info_put(res->fi); | |
2178 | res->fi = NULL; | |
2179 | } | |
2180 | } else if (res->type == RTN_MULTICAST) { | |
2181 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
2182 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, | |
2183 | oldflp->proto)) | |
2184 | flags &= ~RTCF_LOCAL; | |
2185 | /* If multicast route do not exist use | |
2186 | default one, but do not gateway in this case. | |
2187 | Yes, it is hack. | |
2188 | */ | |
2189 | if (res->fi && res->prefixlen < 4) { | |
2190 | fib_info_put(res->fi); | |
2191 | res->fi = NULL; | |
2192 | } | |
2193 | } | |
2194 | ||
2195 | ||
2196 | rth = dst_alloc(&ipv4_dst_ops); | |
2197 | if (!rth) { | |
2198 | err = -ENOBUFS; | |
2199 | goto cleanup; | |
2200 | } | |
2201 | ||
ce723d8e | 2202 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 LT |
2203 | rth->u.dst.flags= DST_HOST; |
2204 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
2205 | if (res->fi) { | |
2206 | rth->rt_multipath_alg = res->fi->fib_mp_alg; | |
2207 | if (res->fi->fib_nhs > 1) | |
2208 | rth->u.dst.flags |= DST_BALANCED; | |
2209 | } | |
2210 | #endif | |
2211 | if (in_dev->cnf.no_xfrm) | |
2212 | rth->u.dst.flags |= DST_NOXFRM; | |
2213 | if (in_dev->cnf.no_policy) | |
2214 | rth->u.dst.flags |= DST_NOPOLICY; | |
2215 | ||
2216 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2217 | rth->fl.fl4_tos = tos; | |
2218 | rth->fl.fl4_src = oldflp->fl4_src; | |
2219 | rth->fl.oif = oldflp->oif; | |
2220 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
2221 | rth->fl.fl4_fwmark= oldflp->fl4_fwmark; | |
2222 | #endif | |
2223 | rth->rt_dst = fl->fl4_dst; | |
2224 | rth->rt_src = fl->fl4_src; | |
2225 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
2226 | /* get references to the devices that are to be hold by the routing | |
2227 | cache entry */ | |
2228 | rth->u.dst.dev = dev_out; | |
2229 | dev_hold(dev_out); | |
2230 | rth->idev = in_dev_get(dev_out); | |
2231 | rth->rt_gateway = fl->fl4_dst; | |
2232 | rth->rt_spec_dst= fl->fl4_src; | |
2233 | ||
2234 | rth->u.dst.output=ip_output; | |
2235 | ||
2236 | RT_CACHE_STAT_INC(out_slow_tot); | |
2237 | ||
2238 | if (flags & RTCF_LOCAL) { | |
2239 | rth->u.dst.input = ip_local_deliver; | |
2240 | rth->rt_spec_dst = fl->fl4_dst; | |
2241 | } | |
2242 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2243 | rth->rt_spec_dst = fl->fl4_src; | |
2244 | if (flags & RTCF_LOCAL && | |
2245 | !(dev_out->flags & IFF_LOOPBACK)) { | |
2246 | rth->u.dst.output = ip_mc_output; | |
2247 | RT_CACHE_STAT_INC(out_slow_mc); | |
2248 | } | |
2249 | #ifdef CONFIG_IP_MROUTE | |
2250 | if (res->type == RTN_MULTICAST) { | |
2251 | if (IN_DEV_MFORWARD(in_dev) && | |
2252 | !LOCAL_MCAST(oldflp->fl4_dst)) { | |
2253 | rth->u.dst.input = ip_mr_input; | |
2254 | rth->u.dst.output = ip_mc_output; | |
2255 | } | |
2256 | } | |
2257 | #endif | |
2258 | } | |
2259 | ||
2260 | rt_set_nexthop(rth, res, 0); | |
2261 | ||
2262 | rth->rt_flags = flags; | |
2263 | ||
2264 | *result = rth; | |
2265 | cleanup: | |
2266 | /* release work reference to inet device */ | |
2267 | in_dev_put(in_dev); | |
2268 | ||
2269 | return err; | |
2270 | } | |
2271 | ||
2272 | static inline int ip_mkroute_output_def(struct rtable **rp, | |
2273 | struct fib_result* res, | |
2274 | const struct flowi *fl, | |
2275 | const struct flowi *oldflp, | |
2276 | struct net_device *dev_out, | |
2277 | unsigned flags) | |
2278 | { | |
7abaa27c | 2279 | struct rtable *rth = NULL; |
1da177e4 LT |
2280 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2281 | unsigned hash; | |
2282 | if (err == 0) { | |
1da177e4 | 2283 | hash = rt_hash_code(oldflp->fl4_dst, |
cef2685e | 2284 | oldflp->fl4_src ^ (oldflp->oif << 5)); |
1da177e4 LT |
2285 | err = rt_intern_hash(hash, rth, rp); |
2286 | } | |
2287 | ||
2288 | return err; | |
2289 | } | |
2290 | ||
2291 | static inline int ip_mkroute_output(struct rtable** rp, | |
2292 | struct fib_result* res, | |
2293 | const struct flowi *fl, | |
2294 | const struct flowi *oldflp, | |
2295 | struct net_device *dev_out, | |
2296 | unsigned flags) | |
2297 | { | |
2298 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
1da177e4 LT |
2299 | unsigned char hop; |
2300 | unsigned hash; | |
2301 | int err = -EINVAL; | |
7abaa27c | 2302 | struct rtable *rth = NULL; |
1da177e4 LT |
2303 | |
2304 | if (res->fi && res->fi->fib_nhs > 1) { | |
2305 | unsigned char hopcount = res->fi->fib_nhs; | |
2306 | ||
2307 | for (hop = 0; hop < hopcount; hop++) { | |
2308 | struct net_device *dev2nexthop; | |
2309 | ||
2310 | res->nh_sel = hop; | |
2311 | ||
2312 | /* hold a work reference to the output device */ | |
2313 | dev2nexthop = FIB_RES_DEV(*res); | |
2314 | dev_hold(dev2nexthop); | |
2315 | ||
ce723d8e JA |
2316 | /* put reference to previous result */ |
2317 | if (hop) | |
2318 | ip_rt_put(*rp); | |
2319 | ||
1da177e4 LT |
2320 | err = __mkroute_output(&rth, res, fl, oldflp, |
2321 | dev2nexthop, flags); | |
2322 | ||
2323 | if (err != 0) | |
2324 | goto cleanup; | |
2325 | ||
2326 | hash = rt_hash_code(oldflp->fl4_dst, | |
2327 | oldflp->fl4_src ^ | |
cef2685e | 2328 | (oldflp->oif << 5)); |
1da177e4 LT |
2329 | err = rt_intern_hash(hash, rth, rp); |
2330 | ||
2331 | /* forward hop information to multipath impl. */ | |
2332 | multipath_set_nhinfo(rth, | |
2333 | FIB_RES_NETWORK(*res), | |
2334 | FIB_RES_NETMASK(*res), | |
2335 | res->prefixlen, | |
2336 | &FIB_RES_NH(*res)); | |
2337 | cleanup: | |
2338 | /* release work reference to output device */ | |
2339 | dev_put(dev2nexthop); | |
2340 | ||
2341 | if (err != 0) | |
2342 | return err; | |
2343 | } | |
1da177e4 LT |
2344 | return err; |
2345 | } else { | |
2346 | return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out, | |
2347 | flags); | |
2348 | } | |
2349 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ | |
2350 | return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out, flags); | |
2351 | #endif | |
2352 | } | |
2353 | ||
2354 | /* | |
2355 | * Major route resolver routine. | |
2356 | */ | |
2357 | ||
2358 | static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp) | |
2359 | { | |
2360 | u32 tos = RT_FL_TOS(oldflp); | |
2361 | struct flowi fl = { .nl_u = { .ip4_u = | |
2362 | { .daddr = oldflp->fl4_dst, | |
2363 | .saddr = oldflp->fl4_src, | |
2364 | .tos = tos & IPTOS_RT_MASK, | |
2365 | .scope = ((tos & RTO_ONLINK) ? | |
2366 | RT_SCOPE_LINK : | |
2367 | RT_SCOPE_UNIVERSE), | |
2368 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
2369 | .fwmark = oldflp->fl4_fwmark | |
2370 | #endif | |
2371 | } }, | |
2372 | .iif = loopback_dev.ifindex, | |
2373 | .oif = oldflp->oif }; | |
2374 | struct fib_result res; | |
2375 | unsigned flags = 0; | |
2376 | struct net_device *dev_out = NULL; | |
2377 | int free_res = 0; | |
2378 | int err; | |
2379 | ||
2380 | ||
2381 | res.fi = NULL; | |
2382 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2383 | res.r = NULL; | |
2384 | #endif | |
2385 | ||
2386 | if (oldflp->fl4_src) { | |
2387 | err = -EINVAL; | |
2388 | if (MULTICAST(oldflp->fl4_src) || | |
2389 | BADCLASS(oldflp->fl4_src) || | |
2390 | ZERONET(oldflp->fl4_src)) | |
2391 | goto out; | |
2392 | ||
2393 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
2394 | dev_out = ip_dev_find(oldflp->fl4_src); | |
2395 | if (dev_out == NULL) | |
2396 | goto out; | |
2397 | ||
2398 | /* I removed check for oif == dev_out->oif here. | |
2399 | It was wrong for two reasons: | |
2400 | 1. ip_dev_find(saddr) can return wrong iface, if saddr is | |
2401 | assigned to multiple interfaces. | |
2402 | 2. Moreover, we are allowed to send packets with saddr | |
2403 | of another iface. --ANK | |
2404 | */ | |
2405 | ||
2406 | if (oldflp->oif == 0 | |
2407 | && (MULTICAST(oldflp->fl4_dst) || oldflp->fl4_dst == 0xFFFFFFFF)) { | |
2408 | /* Special hack: user can direct multicasts | |
2409 | and limited broadcast via necessary interface | |
2410 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2411 | This hack is not just for fun, it allows | |
2412 | vic,vat and friends to work. | |
2413 | They bind socket to loopback, set ttl to zero | |
2414 | and expect that it will work. | |
2415 | From the viewpoint of routing cache they are broken, | |
2416 | because we are not allowed to build multicast path | |
2417 | with loopback source addr (look, routing cache | |
2418 | cannot know, that ttl is zero, so that packet | |
2419 | will not leave this host and route is valid). | |
2420 | Luckily, this hack is good workaround. | |
2421 | */ | |
2422 | ||
2423 | fl.oif = dev_out->ifindex; | |
2424 | goto make_route; | |
2425 | } | |
2426 | if (dev_out) | |
2427 | dev_put(dev_out); | |
2428 | dev_out = NULL; | |
2429 | } | |
2430 | ||
2431 | ||
2432 | if (oldflp->oif) { | |
2433 | dev_out = dev_get_by_index(oldflp->oif); | |
2434 | err = -ENODEV; | |
2435 | if (dev_out == NULL) | |
2436 | goto out; | |
e5ed6399 HX |
2437 | |
2438 | /* RACE: Check return value of inet_select_addr instead. */ | |
2439 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2440 | dev_put(dev_out); |
2441 | goto out; /* Wrong error code */ | |
2442 | } | |
2443 | ||
2444 | if (LOCAL_MCAST(oldflp->fl4_dst) || oldflp->fl4_dst == 0xFFFFFFFF) { | |
2445 | if (!fl.fl4_src) | |
2446 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2447 | RT_SCOPE_LINK); | |
2448 | goto make_route; | |
2449 | } | |
2450 | if (!fl.fl4_src) { | |
2451 | if (MULTICAST(oldflp->fl4_dst)) | |
2452 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2453 | fl.fl4_scope); | |
2454 | else if (!oldflp->fl4_dst) | |
2455 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2456 | RT_SCOPE_HOST); | |
2457 | } | |
2458 | } | |
2459 | ||
2460 | if (!fl.fl4_dst) { | |
2461 | fl.fl4_dst = fl.fl4_src; | |
2462 | if (!fl.fl4_dst) | |
2463 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2464 | if (dev_out) | |
2465 | dev_put(dev_out); | |
2466 | dev_out = &loopback_dev; | |
2467 | dev_hold(dev_out); | |
2468 | fl.oif = loopback_dev.ifindex; | |
2469 | res.type = RTN_LOCAL; | |
2470 | flags |= RTCF_LOCAL; | |
2471 | goto make_route; | |
2472 | } | |
2473 | ||
2474 | if (fib_lookup(&fl, &res)) { | |
2475 | res.fi = NULL; | |
2476 | if (oldflp->oif) { | |
2477 | /* Apparently, routing tables are wrong. Assume, | |
2478 | that the destination is on link. | |
2479 | ||
2480 | WHY? DW. | |
2481 | Because we are allowed to send to iface | |
2482 | even if it has NO routes and NO assigned | |
2483 | addresses. When oif is specified, routing | |
2484 | tables are looked up with only one purpose: | |
2485 | to catch if destination is gatewayed, rather than | |
2486 | direct. Moreover, if MSG_DONTROUTE is set, | |
2487 | we send packet, ignoring both routing tables | |
2488 | and ifaddr state. --ANK | |
2489 | ||
2490 | ||
2491 | We could make it even if oif is unknown, | |
2492 | likely IPv6, but we do not. | |
2493 | */ | |
2494 | ||
2495 | if (fl.fl4_src == 0) | |
2496 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2497 | RT_SCOPE_LINK); | |
2498 | res.type = RTN_UNICAST; | |
2499 | goto make_route; | |
2500 | } | |
2501 | if (dev_out) | |
2502 | dev_put(dev_out); | |
2503 | err = -ENETUNREACH; | |
2504 | goto out; | |
2505 | } | |
2506 | free_res = 1; | |
2507 | ||
2508 | if (res.type == RTN_LOCAL) { | |
2509 | if (!fl.fl4_src) | |
2510 | fl.fl4_src = fl.fl4_dst; | |
2511 | if (dev_out) | |
2512 | dev_put(dev_out); | |
2513 | dev_out = &loopback_dev; | |
2514 | dev_hold(dev_out); | |
2515 | fl.oif = dev_out->ifindex; | |
2516 | if (res.fi) | |
2517 | fib_info_put(res.fi); | |
2518 | res.fi = NULL; | |
2519 | flags |= RTCF_LOCAL; | |
2520 | goto make_route; | |
2521 | } | |
2522 | ||
2523 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2524 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2525 | fib_select_multipath(&fl, &res); | |
2526 | else | |
2527 | #endif | |
2528 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
2529 | fib_select_default(&fl, &res); | |
2530 | ||
2531 | if (!fl.fl4_src) | |
2532 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2533 | ||
2534 | if (dev_out) | |
2535 | dev_put(dev_out); | |
2536 | dev_out = FIB_RES_DEV(res); | |
2537 | dev_hold(dev_out); | |
2538 | fl.oif = dev_out->ifindex; | |
2539 | ||
2540 | ||
2541 | make_route: | |
2542 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2543 | ||
2544 | ||
2545 | if (free_res) | |
2546 | fib_res_put(&res); | |
2547 | if (dev_out) | |
2548 | dev_put(dev_out); | |
2549 | out: return err; | |
2550 | } | |
2551 | ||
2552 | int __ip_route_output_key(struct rtable **rp, const struct flowi *flp) | |
2553 | { | |
2554 | unsigned hash; | |
2555 | struct rtable *rth; | |
2556 | ||
cef2685e | 2557 | hash = rt_hash_code(flp->fl4_dst, flp->fl4_src ^ (flp->oif << 5)); |
1da177e4 LT |
2558 | |
2559 | rcu_read_lock_bh(); | |
2560 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
2561 | rth = rcu_dereference(rth->u.rt_next)) { | |
2562 | if (rth->fl.fl4_dst == flp->fl4_dst && | |
2563 | rth->fl.fl4_src == flp->fl4_src && | |
2564 | rth->fl.iif == 0 && | |
2565 | rth->fl.oif == flp->oif && | |
2566 | #ifdef CONFIG_IP_ROUTE_FWMARK | |
2567 | rth->fl.fl4_fwmark == flp->fl4_fwmark && | |
2568 | #endif | |
2569 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & | |
2570 | (IPTOS_RT_MASK | RTO_ONLINK))) { | |
2571 | ||
2572 | /* check for multipath routes and choose one if | |
2573 | * necessary | |
2574 | */ | |
2575 | if (multipath_select_route(flp, rth, rp)) { | |
2576 | dst_hold(&(*rp)->u.dst); | |
2577 | RT_CACHE_STAT_INC(out_hit); | |
2578 | rcu_read_unlock_bh(); | |
2579 | return 0; | |
2580 | } | |
2581 | ||
2582 | rth->u.dst.lastuse = jiffies; | |
2583 | dst_hold(&rth->u.dst); | |
2584 | rth->u.dst.__use++; | |
2585 | RT_CACHE_STAT_INC(out_hit); | |
2586 | rcu_read_unlock_bh(); | |
2587 | *rp = rth; | |
2588 | return 0; | |
2589 | } | |
2590 | RT_CACHE_STAT_INC(out_hlist_search); | |
2591 | } | |
2592 | rcu_read_unlock_bh(); | |
2593 | ||
2594 | return ip_route_output_slow(rp, flp); | |
2595 | } | |
2596 | ||
d8c97a94 ACM |
2597 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2598 | ||
1da177e4 LT |
2599 | int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags) |
2600 | { | |
2601 | int err; | |
2602 | ||
2603 | if ((err = __ip_route_output_key(rp, flp)) != 0) | |
2604 | return err; | |
2605 | ||
2606 | if (flp->proto) { | |
2607 | if (!flp->fl4_src) | |
2608 | flp->fl4_src = (*rp)->rt_src; | |
2609 | if (!flp->fl4_dst) | |
2610 | flp->fl4_dst = (*rp)->rt_dst; | |
2611 | return xfrm_lookup((struct dst_entry **)rp, flp, sk, flags); | |
2612 | } | |
2613 | ||
2614 | return 0; | |
2615 | } | |
2616 | ||
d8c97a94 ACM |
2617 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2618 | ||
1da177e4 LT |
2619 | int ip_route_output_key(struct rtable **rp, struct flowi *flp) |
2620 | { | |
2621 | return ip_route_output_flow(rp, flp, NULL, 0); | |
2622 | } | |
2623 | ||
2624 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2625 | int nowait, unsigned int flags) |
1da177e4 LT |
2626 | { |
2627 | struct rtable *rt = (struct rtable*)skb->dst; | |
2628 | struct rtmsg *r; | |
2629 | struct nlmsghdr *nlh; | |
2630 | unsigned char *b = skb->tail; | |
2631 | struct rta_cacheinfo ci; | |
2632 | #ifdef CONFIG_IP_MROUTE | |
2633 | struct rtattr *eptr; | |
2634 | #endif | |
b6544c0b | 2635 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 2636 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
2637 | r->rtm_family = AF_INET; |
2638 | r->rtm_dst_len = 32; | |
2639 | r->rtm_src_len = 0; | |
2640 | r->rtm_tos = rt->fl.fl4_tos; | |
2641 | r->rtm_table = RT_TABLE_MAIN; | |
2642 | r->rtm_type = rt->rt_type; | |
2643 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2644 | r->rtm_protocol = RTPROT_UNSPEC; | |
2645 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2646 | if (rt->rt_flags & RTCF_NOTIFY) | |
2647 | r->rtm_flags |= RTM_F_NOTIFY; | |
2648 | RTA_PUT(skb, RTA_DST, 4, &rt->rt_dst); | |
2649 | if (rt->fl.fl4_src) { | |
2650 | r->rtm_src_len = 32; | |
2651 | RTA_PUT(skb, RTA_SRC, 4, &rt->fl.fl4_src); | |
2652 | } | |
2653 | if (rt->u.dst.dev) | |
2654 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); | |
2655 | #ifdef CONFIG_NET_CLS_ROUTE | |
2656 | if (rt->u.dst.tclassid) | |
2657 | RTA_PUT(skb, RTA_FLOW, 4, &rt->u.dst.tclassid); | |
2658 | #endif | |
2659 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED | |
2660 | if (rt->rt_multipath_alg != IP_MP_ALG_NONE) { | |
2661 | __u32 alg = rt->rt_multipath_alg; | |
2662 | ||
2663 | RTA_PUT(skb, RTA_MP_ALGO, 4, &alg); | |
2664 | } | |
2665 | #endif | |
2666 | if (rt->fl.iif) | |
2667 | RTA_PUT(skb, RTA_PREFSRC, 4, &rt->rt_spec_dst); | |
2668 | else if (rt->rt_src != rt->fl.fl4_src) | |
2669 | RTA_PUT(skb, RTA_PREFSRC, 4, &rt->rt_src); | |
2670 | if (rt->rt_dst != rt->rt_gateway) | |
2671 | RTA_PUT(skb, RTA_GATEWAY, 4, &rt->rt_gateway); | |
2672 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
2673 | goto rtattr_failure; | |
2674 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); | |
2675 | ci.rta_used = rt->u.dst.__use; | |
2676 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
2677 | if (rt->u.dst.expires) | |
2678 | ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies); | |
2679 | else | |
2680 | ci.rta_expires = 0; | |
2681 | ci.rta_error = rt->u.dst.error; | |
2682 | ci.rta_id = ci.rta_ts = ci.rta_tsage = 0; | |
2683 | if (rt->peer) { | |
2684 | ci.rta_id = rt->peer->ip_id_count; | |
2685 | if (rt->peer->tcp_ts_stamp) { | |
2686 | ci.rta_ts = rt->peer->tcp_ts; | |
2687 | ci.rta_tsage = xtime.tv_sec - rt->peer->tcp_ts_stamp; | |
2688 | } | |
2689 | } | |
2690 | #ifdef CONFIG_IP_MROUTE | |
2691 | eptr = (struct rtattr*)skb->tail; | |
2692 | #endif | |
2693 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
2694 | if (rt->fl.iif) { | |
2695 | #ifdef CONFIG_IP_MROUTE | |
2696 | u32 dst = rt->rt_dst; | |
2697 | ||
2698 | if (MULTICAST(dst) && !LOCAL_MCAST(dst) && | |
2699 | ipv4_devconf.mc_forwarding) { | |
2700 | int err = ipmr_get_route(skb, r, nowait); | |
2701 | if (err <= 0) { | |
2702 | if (!nowait) { | |
2703 | if (err == 0) | |
2704 | return 0; | |
2705 | goto nlmsg_failure; | |
2706 | } else { | |
2707 | if (err == -EMSGSIZE) | |
2708 | goto nlmsg_failure; | |
2709 | ((struct rta_cacheinfo*)RTA_DATA(eptr))->rta_error = err; | |
2710 | } | |
2711 | } | |
2712 | } else | |
2713 | #endif | |
2714 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); | |
2715 | } | |
2716 | ||
2717 | nlh->nlmsg_len = skb->tail - b; | |
2718 | return skb->len; | |
2719 | ||
2720 | nlmsg_failure: | |
2721 | rtattr_failure: | |
2722 | skb_trim(skb, b - skb->data); | |
2723 | return -1; | |
2724 | } | |
2725 | ||
2726 | int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) | |
2727 | { | |
2728 | struct rtattr **rta = arg; | |
2729 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
2730 | struct rtable *rt = NULL; | |
2731 | u32 dst = 0; | |
2732 | u32 src = 0; | |
2733 | int iif = 0; | |
2734 | int err = -ENOBUFS; | |
2735 | struct sk_buff *skb; | |
2736 | ||
2737 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2738 | if (!skb) | |
2739 | goto out; | |
2740 | ||
2741 | /* Reserve room for dummy headers, this skb can pass | |
2742 | through good chunk of routing engine. | |
2743 | */ | |
d2c962b8 SH |
2744 | skb->mac.raw = skb->nh.raw = skb->data; |
2745 | ||
2746 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
2747 | skb->nh.iph->protocol = IPPROTO_ICMP; | |
1da177e4 LT |
2748 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2749 | ||
2750 | if (rta[RTA_SRC - 1]) | |
2751 | memcpy(&src, RTA_DATA(rta[RTA_SRC - 1]), 4); | |
2752 | if (rta[RTA_DST - 1]) | |
2753 | memcpy(&dst, RTA_DATA(rta[RTA_DST - 1]), 4); | |
2754 | if (rta[RTA_IIF - 1]) | |
2755 | memcpy(&iif, RTA_DATA(rta[RTA_IIF - 1]), sizeof(int)); | |
2756 | ||
2757 | if (iif) { | |
2758 | struct net_device *dev = __dev_get_by_index(iif); | |
2759 | err = -ENODEV; | |
2760 | if (!dev) | |
2761 | goto out_free; | |
2762 | skb->protocol = htons(ETH_P_IP); | |
2763 | skb->dev = dev; | |
2764 | local_bh_disable(); | |
2765 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2766 | local_bh_enable(); | |
2767 | rt = (struct rtable*)skb->dst; | |
2768 | if (!err && rt->u.dst.error) | |
2769 | err = -rt->u.dst.error; | |
2770 | } else { | |
2771 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dst, | |
2772 | .saddr = src, | |
2773 | .tos = rtm->rtm_tos } } }; | |
2774 | int oif = 0; | |
2775 | if (rta[RTA_OIF - 1]) | |
2776 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
2777 | fl.oif = oif; | |
2778 | err = ip_route_output_key(&rt, &fl); | |
2779 | } | |
2780 | if (err) | |
2781 | goto out_free; | |
2782 | ||
2783 | skb->dst = &rt->u.dst; | |
2784 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
2785 | rt->rt_flags |= RTCF_NOTIFY; | |
2786 | ||
2787 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
2788 | ||
2789 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, | |
b6544c0b | 2790 | RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
2791 | if (!err) |
2792 | goto out_free; | |
2793 | if (err < 0) { | |
2794 | err = -EMSGSIZE; | |
2795 | goto out_free; | |
2796 | } | |
2797 | ||
2798 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
2799 | if (err > 0) | |
2800 | err = 0; | |
2801 | out: return err; | |
2802 | ||
2803 | out_free: | |
2804 | kfree_skb(skb); | |
2805 | goto out; | |
2806 | } | |
2807 | ||
2808 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2809 | { | |
2810 | struct rtable *rt; | |
2811 | int h, s_h; | |
2812 | int idx, s_idx; | |
2813 | ||
2814 | s_h = cb->args[0]; | |
2815 | s_idx = idx = cb->args[1]; | |
2816 | for (h = 0; h <= rt_hash_mask; h++) { | |
2817 | if (h < s_h) continue; | |
2818 | if (h > s_h) | |
2819 | s_idx = 0; | |
2820 | rcu_read_lock_bh(); | |
2821 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
2822 | rt = rcu_dereference(rt->u.rt_next), idx++) { | |
2823 | if (idx < s_idx) | |
2824 | continue; | |
2825 | skb->dst = dst_clone(&rt->u.dst); | |
2826 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
b6544c0b JHS |
2827 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
2828 | 1, NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
2829 | dst_release(xchg(&skb->dst, NULL)); |
2830 | rcu_read_unlock_bh(); | |
2831 | goto done; | |
2832 | } | |
2833 | dst_release(xchg(&skb->dst, NULL)); | |
2834 | } | |
2835 | rcu_read_unlock_bh(); | |
2836 | } | |
2837 | ||
2838 | done: | |
2839 | cb->args[0] = h; | |
2840 | cb->args[1] = idx; | |
2841 | return skb->len; | |
2842 | } | |
2843 | ||
2844 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2845 | { | |
2846 | rt_cache_flush(0); | |
2847 | } | |
2848 | ||
2849 | #ifdef CONFIG_SYSCTL | |
2850 | static int flush_delay; | |
2851 | ||
2852 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, | |
2853 | struct file *filp, void __user *buffer, | |
2854 | size_t *lenp, loff_t *ppos) | |
2855 | { | |
2856 | if (write) { | |
2857 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2858 | rt_cache_flush(flush_delay); | |
2859 | return 0; | |
2860 | } | |
2861 | ||
2862 | return -EINVAL; | |
2863 | } | |
2864 | ||
2865 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
2866 | int __user *name, | |
2867 | int nlen, | |
2868 | void __user *oldval, | |
2869 | size_t __user *oldlenp, | |
2870 | void __user *newval, | |
2871 | size_t newlen, | |
2872 | void **context) | |
2873 | { | |
2874 | int delay; | |
2875 | if (newlen != sizeof(int)) | |
2876 | return -EINVAL; | |
2877 | if (get_user(delay, (int __user *)newval)) | |
2878 | return -EFAULT; | |
2879 | rt_cache_flush(delay); | |
2880 | return 0; | |
2881 | } | |
2882 | ||
2883 | ctl_table ipv4_route_table[] = { | |
2884 | { | |
2885 | .ctl_name = NET_IPV4_ROUTE_FLUSH, | |
2886 | .procname = "flush", | |
2887 | .data = &flush_delay, | |
2888 | .maxlen = sizeof(int), | |
7e3e0360 | 2889 | .mode = 0200, |
1da177e4 LT |
2890 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
2891 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
2892 | }, | |
2893 | { | |
2894 | .ctl_name = NET_IPV4_ROUTE_MIN_DELAY, | |
2895 | .procname = "min_delay", | |
2896 | .data = &ip_rt_min_delay, | |
2897 | .maxlen = sizeof(int), | |
2898 | .mode = 0644, | |
2899 | .proc_handler = &proc_dointvec_jiffies, | |
2900 | .strategy = &sysctl_jiffies, | |
2901 | }, | |
2902 | { | |
2903 | .ctl_name = NET_IPV4_ROUTE_MAX_DELAY, | |
2904 | .procname = "max_delay", | |
2905 | .data = &ip_rt_max_delay, | |
2906 | .maxlen = sizeof(int), | |
2907 | .mode = 0644, | |
2908 | .proc_handler = &proc_dointvec_jiffies, | |
2909 | .strategy = &sysctl_jiffies, | |
2910 | }, | |
2911 | { | |
2912 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
2913 | .procname = "gc_thresh", | |
2914 | .data = &ipv4_dst_ops.gc_thresh, | |
2915 | .maxlen = sizeof(int), | |
2916 | .mode = 0644, | |
2917 | .proc_handler = &proc_dointvec, | |
2918 | }, | |
2919 | { | |
2920 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
2921 | .procname = "max_size", | |
2922 | .data = &ip_rt_max_size, | |
2923 | .maxlen = sizeof(int), | |
2924 | .mode = 0644, | |
2925 | .proc_handler = &proc_dointvec, | |
2926 | }, | |
2927 | { | |
2928 | /* Deprecated. Use gc_min_interval_ms */ | |
2929 | ||
2930 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, | |
2931 | .procname = "gc_min_interval", | |
2932 | .data = &ip_rt_gc_min_interval, | |
2933 | .maxlen = sizeof(int), | |
2934 | .mode = 0644, | |
2935 | .proc_handler = &proc_dointvec_jiffies, | |
2936 | .strategy = &sysctl_jiffies, | |
2937 | }, | |
2938 | { | |
2939 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
2940 | .procname = "gc_min_interval_ms", | |
2941 | .data = &ip_rt_gc_min_interval, | |
2942 | .maxlen = sizeof(int), | |
2943 | .mode = 0644, | |
2944 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2945 | .strategy = &sysctl_ms_jiffies, | |
2946 | }, | |
2947 | { | |
2948 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
2949 | .procname = "gc_timeout", | |
2950 | .data = &ip_rt_gc_timeout, | |
2951 | .maxlen = sizeof(int), | |
2952 | .mode = 0644, | |
2953 | .proc_handler = &proc_dointvec_jiffies, | |
2954 | .strategy = &sysctl_jiffies, | |
2955 | }, | |
2956 | { | |
2957 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
2958 | .procname = "gc_interval", | |
2959 | .data = &ip_rt_gc_interval, | |
2960 | .maxlen = sizeof(int), | |
2961 | .mode = 0644, | |
2962 | .proc_handler = &proc_dointvec_jiffies, | |
2963 | .strategy = &sysctl_jiffies, | |
2964 | }, | |
2965 | { | |
2966 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
2967 | .procname = "redirect_load", | |
2968 | .data = &ip_rt_redirect_load, | |
2969 | .maxlen = sizeof(int), | |
2970 | .mode = 0644, | |
2971 | .proc_handler = &proc_dointvec, | |
2972 | }, | |
2973 | { | |
2974 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
2975 | .procname = "redirect_number", | |
2976 | .data = &ip_rt_redirect_number, | |
2977 | .maxlen = sizeof(int), | |
2978 | .mode = 0644, | |
2979 | .proc_handler = &proc_dointvec, | |
2980 | }, | |
2981 | { | |
2982 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
2983 | .procname = "redirect_silence", | |
2984 | .data = &ip_rt_redirect_silence, | |
2985 | .maxlen = sizeof(int), | |
2986 | .mode = 0644, | |
2987 | .proc_handler = &proc_dointvec, | |
2988 | }, | |
2989 | { | |
2990 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
2991 | .procname = "error_cost", | |
2992 | .data = &ip_rt_error_cost, | |
2993 | .maxlen = sizeof(int), | |
2994 | .mode = 0644, | |
2995 | .proc_handler = &proc_dointvec, | |
2996 | }, | |
2997 | { | |
2998 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
2999 | .procname = "error_burst", | |
3000 | .data = &ip_rt_error_burst, | |
3001 | .maxlen = sizeof(int), | |
3002 | .mode = 0644, | |
3003 | .proc_handler = &proc_dointvec, | |
3004 | }, | |
3005 | { | |
3006 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
3007 | .procname = "gc_elasticity", | |
3008 | .data = &ip_rt_gc_elasticity, | |
3009 | .maxlen = sizeof(int), | |
3010 | .mode = 0644, | |
3011 | .proc_handler = &proc_dointvec, | |
3012 | }, | |
3013 | { | |
3014 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
3015 | .procname = "mtu_expires", | |
3016 | .data = &ip_rt_mtu_expires, | |
3017 | .maxlen = sizeof(int), | |
3018 | .mode = 0644, | |
3019 | .proc_handler = &proc_dointvec_jiffies, | |
3020 | .strategy = &sysctl_jiffies, | |
3021 | }, | |
3022 | { | |
3023 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
3024 | .procname = "min_pmtu", | |
3025 | .data = &ip_rt_min_pmtu, | |
3026 | .maxlen = sizeof(int), | |
3027 | .mode = 0644, | |
3028 | .proc_handler = &proc_dointvec, | |
3029 | }, | |
3030 | { | |
3031 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
3032 | .procname = "min_adv_mss", | |
3033 | .data = &ip_rt_min_advmss, | |
3034 | .maxlen = sizeof(int), | |
3035 | .mode = 0644, | |
3036 | .proc_handler = &proc_dointvec, | |
3037 | }, | |
3038 | { | |
3039 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
3040 | .procname = "secret_interval", | |
3041 | .data = &ip_rt_secret_interval, | |
3042 | .maxlen = sizeof(int), | |
3043 | .mode = 0644, | |
3044 | .proc_handler = &proc_dointvec_jiffies, | |
3045 | .strategy = &sysctl_jiffies, | |
3046 | }, | |
3047 | { .ctl_name = 0 } | |
3048 | }; | |
3049 | #endif | |
3050 | ||
3051 | #ifdef CONFIG_NET_CLS_ROUTE | |
3052 | struct ip_rt_acct *ip_rt_acct; | |
3053 | ||
3054 | /* This code sucks. But you should have seen it before! --RR */ | |
3055 | ||
3056 | /* IP route accounting ptr for this logical cpu number. */ | |
3057 | #define IP_RT_ACCT_CPU(i) (ip_rt_acct + i * 256) | |
3058 | ||
3059 | #ifdef CONFIG_PROC_FS | |
3060 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
3061 | int length, int *eof, void *data) | |
3062 | { | |
3063 | unsigned int i; | |
3064 | ||
3065 | if ((offset & 3) || (length & 3)) | |
3066 | return -EIO; | |
3067 | ||
3068 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
3069 | *eof = 1; | |
3070 | return 0; | |
3071 | } | |
3072 | ||
3073 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
3074 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
3075 | *eof = 1; | |
3076 | } | |
3077 | ||
3078 | offset /= sizeof(u32); | |
3079 | ||
3080 | if (length > 0) { | |
3081 | u32 *src = ((u32 *) IP_RT_ACCT_CPU(0)) + offset; | |
3082 | u32 *dst = (u32 *) buffer; | |
3083 | ||
3084 | /* Copy first cpu. */ | |
3085 | *start = buffer; | |
3086 | memcpy(dst, src, length); | |
3087 | ||
3088 | /* Add the other cpus in, one int at a time */ | |
6f912042 | 3089 | for_each_possible_cpu(i) { |
1da177e4 LT |
3090 | unsigned int j; |
3091 | ||
3092 | src = ((u32 *) IP_RT_ACCT_CPU(i)) + offset; | |
3093 | ||
3094 | for (j = 0; j < length/4; j++) | |
3095 | dst[j] += src[j]; | |
3096 | } | |
3097 | } | |
3098 | return length; | |
3099 | } | |
3100 | #endif /* CONFIG_PROC_FS */ | |
3101 | #endif /* CONFIG_NET_CLS_ROUTE */ | |
3102 | ||
3103 | static __initdata unsigned long rhash_entries; | |
3104 | static int __init set_rhash_entries(char *str) | |
3105 | { | |
3106 | if (!str) | |
3107 | return 0; | |
3108 | rhash_entries = simple_strtoul(str, &str, 0); | |
3109 | return 1; | |
3110 | } | |
3111 | __setup("rhash_entries=", set_rhash_entries); | |
3112 | ||
3113 | int __init ip_rt_init(void) | |
3114 | { | |
424c4b70 | 3115 | int rc = 0; |
1da177e4 LT |
3116 | |
3117 | rt_hash_rnd = (int) ((num_physpages ^ (num_physpages>>8)) ^ | |
3118 | (jiffies ^ (jiffies >> 7))); | |
3119 | ||
3120 | #ifdef CONFIG_NET_CLS_ROUTE | |
424c4b70 ED |
3121 | { |
3122 | int order; | |
1da177e4 LT |
3123 | for (order = 0; |
3124 | (PAGE_SIZE << order) < 256 * sizeof(struct ip_rt_acct) * NR_CPUS; order++) | |
3125 | /* NOTHING */; | |
3126 | ip_rt_acct = (struct ip_rt_acct *)__get_free_pages(GFP_KERNEL, order); | |
3127 | if (!ip_rt_acct) | |
3128 | panic("IP: failed to allocate ip_rt_acct\n"); | |
3129 | memset(ip_rt_acct, 0, PAGE_SIZE << order); | |
424c4b70 | 3130 | } |
1da177e4 LT |
3131 | #endif |
3132 | ||
3133 | ipv4_dst_ops.kmem_cachep = kmem_cache_create("ip_dst_cache", | |
3134 | sizeof(struct rtable), | |
3135 | 0, SLAB_HWCACHE_ALIGN, | |
3136 | NULL, NULL); | |
3137 | ||
3138 | if (!ipv4_dst_ops.kmem_cachep) | |
3139 | panic("IP: failed to allocate ip_dst_cache\n"); | |
3140 | ||
424c4b70 ED |
3141 | rt_hash_table = (struct rt_hash_bucket *) |
3142 | alloc_large_system_hash("IP route cache", | |
3143 | sizeof(struct rt_hash_bucket), | |
3144 | rhash_entries, | |
3145 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3146 | 15 : 17, |
424c4b70 ED |
3147 | HASH_HIGHMEM, |
3148 | &rt_hash_log, | |
3149 | &rt_hash_mask, | |
3150 | 0); | |
22c047cc ED |
3151 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3152 | rt_hash_lock_init(); | |
1da177e4 LT |
3153 | |
3154 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3155 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3156 | ||
1da177e4 LT |
3157 | devinet_init(); |
3158 | ip_fib_init(); | |
3159 | ||
3160 | init_timer(&rt_flush_timer); | |
3161 | rt_flush_timer.function = rt_run_flush; | |
3162 | init_timer(&rt_periodic_timer); | |
3163 | rt_periodic_timer.function = rt_check_expire; | |
3164 | init_timer(&rt_secret_timer); | |
3165 | rt_secret_timer.function = rt_secret_rebuild; | |
3166 | ||
3167 | /* All the timers, started at system startup tend | |
3168 | to synchronize. Perturb it a bit. | |
3169 | */ | |
3170 | rt_periodic_timer.expires = jiffies + net_random() % ip_rt_gc_interval + | |
3171 | ip_rt_gc_interval; | |
3172 | add_timer(&rt_periodic_timer); | |
3173 | ||
3174 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + | |
3175 | ip_rt_secret_interval; | |
3176 | add_timer(&rt_secret_timer); | |
3177 | ||
3178 | #ifdef CONFIG_PROC_FS | |
3179 | { | |
3180 | struct proc_dir_entry *rtstat_pde = NULL; /* keep gcc happy */ | |
3181 | if (!proc_net_fops_create("rt_cache", S_IRUGO, &rt_cache_seq_fops) || | |
3182 | !(rtstat_pde = create_proc_entry("rt_cache", S_IRUGO, | |
3183 | proc_net_stat))) { | |
1da177e4 LT |
3184 | return -ENOMEM; |
3185 | } | |
3186 | rtstat_pde->proc_fops = &rt_cpu_seq_fops; | |
3187 | } | |
3188 | #ifdef CONFIG_NET_CLS_ROUTE | |
3189 | create_proc_read_entry("rt_acct", 0, proc_net, ip_rt_acct_read, NULL); | |
3190 | #endif | |
3191 | #endif | |
3192 | #ifdef CONFIG_XFRM | |
3193 | xfrm_init(); | |
3194 | xfrm4_init(); | |
3195 | #endif | |
3196 | return rc; | |
3197 | } | |
3198 | ||
3199 | EXPORT_SYMBOL(__ip_select_ident); | |
3200 | EXPORT_SYMBOL(ip_route_input); | |
3201 | EXPORT_SYMBOL(ip_route_output_key); |