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 | |
e905a9ed | 23 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
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. | |
e905a9ed | 41 | * |
1da177e4 LT |
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 | ||
1da177e4 LT |
67 | #include <linux/module.h> |
68 | #include <asm/uaccess.h> | |
69 | #include <asm/system.h> | |
70 | #include <linux/bitops.h> | |
71 | #include <linux/types.h> | |
72 | #include <linux/kernel.h> | |
1da177e4 | 73 | #include <linux/mm.h> |
424c4b70 | 74 | #include <linux/bootmem.h> |
1da177e4 LT |
75 | #include <linux/string.h> |
76 | #include <linux/socket.h> | |
77 | #include <linux/sockios.h> | |
78 | #include <linux/errno.h> | |
79 | #include <linux/in.h> | |
80 | #include <linux/inet.h> | |
81 | #include <linux/netdevice.h> | |
82 | #include <linux/proc_fs.h> | |
83 | #include <linux/init.h> | |
84 | #include <linux/skbuff.h> | |
1da177e4 LT |
85 | #include <linux/inetdevice.h> |
86 | #include <linux/igmp.h> | |
87 | #include <linux/pkt_sched.h> | |
88 | #include <linux/mroute.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
90 | #include <linux/random.h> | |
91 | #include <linux/jhash.h> | |
92 | #include <linux/rcupdate.h> | |
93 | #include <linux/times.h> | |
457c4cbc | 94 | #include <net/net_namespace.h> |
1da177e4 LT |
95 | #include <net/protocol.h> |
96 | #include <net/ip.h> | |
97 | #include <net/route.h> | |
98 | #include <net/inetpeer.h> | |
99 | #include <net/sock.h> | |
100 | #include <net/ip_fib.h> | |
101 | #include <net/arp.h> | |
102 | #include <net/tcp.h> | |
103 | #include <net/icmp.h> | |
104 | #include <net/xfrm.h> | |
8d71740c | 105 | #include <net/netevent.h> |
63f3444f | 106 | #include <net/rtnetlink.h> |
1da177e4 LT |
107 | #ifdef CONFIG_SYSCTL |
108 | #include <linux/sysctl.h> | |
109 | #endif | |
110 | ||
111 | #define RT_FL_TOS(oldflp) \ | |
112 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) | |
113 | ||
114 | #define IP_MAX_MTU 0xFFF0 | |
115 | ||
116 | #define RT_GC_TIMEOUT (300*HZ) | |
117 | ||
118 | static int ip_rt_min_delay = 2 * HZ; | |
119 | static int ip_rt_max_delay = 10 * HZ; | |
120 | static int ip_rt_max_size; | |
121 | static int ip_rt_gc_timeout = RT_GC_TIMEOUT; | |
122 | static int ip_rt_gc_interval = 60 * HZ; | |
123 | static int ip_rt_gc_min_interval = HZ / 2; | |
124 | static int ip_rt_redirect_number = 9; | |
125 | static int ip_rt_redirect_load = HZ / 50; | |
126 | static int ip_rt_redirect_silence = ((HZ / 50) << (9 + 1)); | |
127 | static int ip_rt_error_cost = HZ; | |
128 | static int ip_rt_error_burst = 5 * HZ; | |
129 | static int ip_rt_gc_elasticity = 8; | |
130 | static int ip_rt_mtu_expires = 10 * 60 * HZ; | |
131 | static int ip_rt_min_pmtu = 512 + 20 + 20; | |
132 | static int ip_rt_min_advmss = 256; | |
133 | static int ip_rt_secret_interval = 10 * 60 * HZ; | |
134 | static unsigned long rt_deadline; | |
135 | ||
136 | #define RTprint(a...) printk(KERN_DEBUG a) | |
137 | ||
138 | static struct timer_list rt_flush_timer; | |
139 | static struct timer_list rt_periodic_timer; | |
140 | static struct timer_list rt_secret_timer; | |
141 | ||
142 | /* | |
143 | * Interface to generic destination cache. | |
144 | */ | |
145 | ||
146 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
147 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
148 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
149 | struct net_device *dev, int how); | |
150 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
151 | static void ipv4_link_failure(struct sk_buff *skb); | |
152 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
153 | static int rt_garbage_collect(void); | |
154 | ||
155 | ||
156 | static struct dst_ops ipv4_dst_ops = { | |
157 | .family = AF_INET, | |
158 | .protocol = __constant_htons(ETH_P_IP), | |
159 | .gc = rt_garbage_collect, | |
160 | .check = ipv4_dst_check, | |
161 | .destroy = ipv4_dst_destroy, | |
162 | .ifdown = ipv4_dst_ifdown, | |
163 | .negative_advice = ipv4_negative_advice, | |
164 | .link_failure = ipv4_link_failure, | |
165 | .update_pmtu = ip_rt_update_pmtu, | |
166 | .entry_size = sizeof(struct rtable), | |
167 | }; | |
168 | ||
169 | #define ECN_OR_COST(class) TC_PRIO_##class | |
170 | ||
4839c52b | 171 | const __u8 ip_tos2prio[16] = { |
1da177e4 LT |
172 | TC_PRIO_BESTEFFORT, |
173 | ECN_OR_COST(FILLER), | |
174 | TC_PRIO_BESTEFFORT, | |
175 | ECN_OR_COST(BESTEFFORT), | |
176 | TC_PRIO_BULK, | |
177 | ECN_OR_COST(BULK), | |
178 | TC_PRIO_BULK, | |
179 | ECN_OR_COST(BULK), | |
180 | TC_PRIO_INTERACTIVE, | |
181 | ECN_OR_COST(INTERACTIVE), | |
182 | TC_PRIO_INTERACTIVE, | |
183 | ECN_OR_COST(INTERACTIVE), | |
184 | TC_PRIO_INTERACTIVE_BULK, | |
185 | ECN_OR_COST(INTERACTIVE_BULK), | |
186 | TC_PRIO_INTERACTIVE_BULK, | |
187 | ECN_OR_COST(INTERACTIVE_BULK) | |
188 | }; | |
189 | ||
190 | ||
191 | /* | |
192 | * Route cache. | |
193 | */ | |
194 | ||
195 | /* The locking scheme is rather straight forward: | |
196 | * | |
197 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
198 | * 2) Only writers remove entries, and they hold the lock | |
199 | * as they look at rtable reference counts. | |
200 | * 3) Only readers acquire references to rtable entries, | |
201 | * they do so with atomic increments and with the | |
202 | * lock held. | |
203 | */ | |
204 | ||
205 | struct rt_hash_bucket { | |
206 | struct rtable *chain; | |
22c047cc | 207 | }; |
8a25d5de IM |
208 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
209 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
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. | |
62051200 | 213 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 214 | */ |
62051200 IM |
215 | #ifdef CONFIG_LOCKDEP |
216 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 217 | #else |
62051200 IM |
218 | # if NR_CPUS >= 32 |
219 | # define RT_HASH_LOCK_SZ 4096 | |
220 | # elif NR_CPUS >= 16 | |
221 | # define RT_HASH_LOCK_SZ 2048 | |
222 | # elif NR_CPUS >= 8 | |
223 | # define RT_HASH_LOCK_SZ 1024 | |
224 | # elif NR_CPUS >= 4 | |
225 | # define RT_HASH_LOCK_SZ 512 | |
226 | # else | |
227 | # define RT_HASH_LOCK_SZ 256 | |
228 | # endif | |
22c047cc ED |
229 | #endif |
230 | ||
231 | static spinlock_t *rt_hash_locks; | |
232 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
233 | # define rt_hash_lock_init() { \ | |
234 | int i; \ | |
235 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, GFP_KERNEL); \ | |
236 | if (!rt_hash_locks) panic("IP: failed to allocate rt_hash_locks\n"); \ | |
237 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) \ | |
238 | spin_lock_init(&rt_hash_locks[i]); \ | |
239 | } | |
240 | #else | |
241 | # define rt_hash_lock_addr(slot) NULL | |
242 | # define rt_hash_lock_init() | |
243 | #endif | |
1da177e4 LT |
244 | |
245 | static struct rt_hash_bucket *rt_hash_table; | |
246 | static unsigned rt_hash_mask; | |
247 | static int rt_hash_log; | |
248 | static unsigned int rt_hash_rnd; | |
249 | ||
2f970d83 | 250 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c | 251 | #define RT_CACHE_STAT_INC(field) \ |
bfe5d834 | 252 | (__raw_get_cpu_var(rt_cache_stat).field++) |
1da177e4 LT |
253 | |
254 | static int rt_intern_hash(unsigned hash, struct rtable *rth, | |
255 | struct rtable **res); | |
256 | ||
cef2685e | 257 | static unsigned int rt_hash_code(u32 daddr, u32 saddr) |
1da177e4 | 258 | { |
cef2685e | 259 | return (jhash_2words(daddr, saddr, rt_hash_rnd) |
1da177e4 LT |
260 | & rt_hash_mask); |
261 | } | |
262 | ||
8c7bc840 AV |
263 | #define rt_hash(daddr, saddr, idx) \ |
264 | rt_hash_code((__force u32)(__be32)(daddr),\ | |
265 | (__force u32)(__be32)(saddr) ^ ((idx) << 5)) | |
266 | ||
1da177e4 LT |
267 | #ifdef CONFIG_PROC_FS |
268 | struct rt_cache_iter_state { | |
269 | int bucket; | |
270 | }; | |
271 | ||
272 | static struct rtable *rt_cache_get_first(struct seq_file *seq) | |
273 | { | |
274 | struct rtable *r = NULL; | |
275 | struct rt_cache_iter_state *st = seq->private; | |
276 | ||
277 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
278 | rcu_read_lock_bh(); | |
279 | r = rt_hash_table[st->bucket].chain; | |
280 | if (r) | |
281 | break; | |
282 | rcu_read_unlock_bh(); | |
283 | } | |
284 | return r; | |
285 | } | |
286 | ||
287 | static struct rtable *rt_cache_get_next(struct seq_file *seq, struct rtable *r) | |
288 | { | |
289 | struct rt_cache_iter_state *st = rcu_dereference(seq->private); | |
290 | ||
093c2ca4 | 291 | r = r->u.dst.rt_next; |
1da177e4 LT |
292 | while (!r) { |
293 | rcu_read_unlock_bh(); | |
294 | if (--st->bucket < 0) | |
295 | break; | |
296 | rcu_read_lock_bh(); | |
297 | r = rt_hash_table[st->bucket].chain; | |
298 | } | |
299 | return r; | |
300 | } | |
301 | ||
302 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) | |
303 | { | |
304 | struct rtable *r = rt_cache_get_first(seq); | |
305 | ||
306 | if (r) | |
307 | while (pos && (r = rt_cache_get_next(seq, r))) | |
308 | --pos; | |
309 | return pos ? NULL : r; | |
310 | } | |
311 | ||
312 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
313 | { | |
314 | return *pos ? rt_cache_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
315 | } | |
316 | ||
317 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
318 | { | |
319 | struct rtable *r = NULL; | |
320 | ||
321 | if (v == SEQ_START_TOKEN) | |
322 | r = rt_cache_get_first(seq); | |
323 | else | |
324 | r = rt_cache_get_next(seq, v); | |
325 | ++*pos; | |
326 | return r; | |
327 | } | |
328 | ||
329 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
330 | { | |
331 | if (v && v != SEQ_START_TOKEN) | |
332 | rcu_read_unlock_bh(); | |
333 | } | |
334 | ||
335 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
336 | { | |
337 | if (v == SEQ_START_TOKEN) | |
338 | seq_printf(seq, "%-127s\n", | |
339 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
340 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
341 | "HHUptod\tSpecDst"); | |
342 | else { | |
343 | struct rtable *r = v; | |
344 | char temp[256]; | |
345 | ||
346 | sprintf(temp, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" | |
347 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X", | |
348 | r->u.dst.dev ? r->u.dst.dev->name : "*", | |
349 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
350 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
351 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
352 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
353 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
354 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
355 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
356 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
357 | r->fl.fl4_tos, | |
358 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
359 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
360 | dev_queue_xmit) : 0, | |
361 | r->rt_spec_dst); | |
362 | seq_printf(seq, "%-127s\n", temp); | |
e905a9ed YH |
363 | } |
364 | return 0; | |
1da177e4 LT |
365 | } |
366 | ||
f690808e | 367 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
368 | .start = rt_cache_seq_start, |
369 | .next = rt_cache_seq_next, | |
370 | .stop = rt_cache_seq_stop, | |
371 | .show = rt_cache_seq_show, | |
372 | }; | |
373 | ||
374 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
375 | { | |
376 | struct seq_file *seq; | |
377 | int rc = -ENOMEM; | |
1bcabbdb | 378 | struct rt_cache_iter_state *s; |
1da177e4 | 379 | |
1bcabbdb | 380 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
381 | if (!s) |
382 | goto out; | |
383 | rc = seq_open(file, &rt_cache_seq_ops); | |
384 | if (rc) | |
385 | goto out_kfree; | |
386 | seq = file->private_data; | |
387 | seq->private = s; | |
1da177e4 LT |
388 | out: |
389 | return rc; | |
390 | out_kfree: | |
391 | kfree(s); | |
392 | goto out; | |
393 | } | |
394 | ||
9a32144e | 395 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
396 | .owner = THIS_MODULE, |
397 | .open = rt_cache_seq_open, | |
398 | .read = seq_read, | |
399 | .llseek = seq_lseek, | |
400 | .release = seq_release_private, | |
401 | }; | |
402 | ||
403 | ||
404 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
405 | { | |
406 | int cpu; | |
407 | ||
408 | if (*pos == 0) | |
409 | return SEQ_START_TOKEN; | |
410 | ||
411 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
412 | if (!cpu_possible(cpu)) | |
413 | continue; | |
414 | *pos = cpu+1; | |
2f970d83 | 415 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
416 | } |
417 | return NULL; | |
418 | } | |
419 | ||
420 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
421 | { | |
422 | int cpu; | |
423 | ||
424 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
425 | if (!cpu_possible(cpu)) | |
426 | continue; | |
427 | *pos = cpu+1; | |
2f970d83 | 428 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
429 | } |
430 | return NULL; | |
e905a9ed | 431 | |
1da177e4 LT |
432 | } |
433 | ||
434 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
435 | { | |
436 | ||
437 | } | |
438 | ||
439 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
440 | { | |
441 | struct rt_cache_stat *st = v; | |
442 | ||
443 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 444 | 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 |
445 | return 0; |
446 | } | |
e905a9ed | 447 | |
1da177e4 LT |
448 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
449 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
450 | atomic_read(&ipv4_dst_ops.entries), | |
451 | st->in_hit, | |
452 | st->in_slow_tot, | |
453 | st->in_slow_mc, | |
454 | st->in_no_route, | |
455 | st->in_brd, | |
456 | st->in_martian_dst, | |
457 | st->in_martian_src, | |
458 | ||
459 | st->out_hit, | |
460 | st->out_slow_tot, | |
e905a9ed | 461 | st->out_slow_mc, |
1da177e4 LT |
462 | |
463 | st->gc_total, | |
464 | st->gc_ignored, | |
465 | st->gc_goal_miss, | |
466 | st->gc_dst_overflow, | |
467 | st->in_hlist_search, | |
468 | st->out_hlist_search | |
469 | ); | |
470 | return 0; | |
471 | } | |
472 | ||
f690808e | 473 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
474 | .start = rt_cpu_seq_start, |
475 | .next = rt_cpu_seq_next, | |
476 | .stop = rt_cpu_seq_stop, | |
477 | .show = rt_cpu_seq_show, | |
478 | }; | |
479 | ||
480 | ||
481 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
482 | { | |
483 | return seq_open(file, &rt_cpu_seq_ops); | |
484 | } | |
485 | ||
9a32144e | 486 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
487 | .owner = THIS_MODULE, |
488 | .open = rt_cpu_seq_open, | |
489 | .read = seq_read, | |
490 | .llseek = seq_lseek, | |
491 | .release = seq_release, | |
492 | }; | |
493 | ||
494 | #endif /* CONFIG_PROC_FS */ | |
e905a9ed | 495 | |
1da177e4 LT |
496 | static __inline__ void rt_free(struct rtable *rt) |
497 | { | |
1da177e4 LT |
498 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
499 | } | |
500 | ||
501 | static __inline__ void rt_drop(struct rtable *rt) | |
502 | { | |
1da177e4 LT |
503 | ip_rt_put(rt); |
504 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
505 | } | |
506 | ||
507 | static __inline__ int rt_fast_clean(struct rtable *rth) | |
508 | { | |
509 | /* Kill broadcast/multicast entries very aggresively, if they | |
510 | collide in hash table with more useful entries */ | |
511 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 512 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
513 | } |
514 | ||
515 | static __inline__ int rt_valuable(struct rtable *rth) | |
516 | { | |
517 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
518 | rth->u.dst.expires; | |
519 | } | |
520 | ||
521 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
522 | { | |
523 | unsigned long age; | |
524 | int ret = 0; | |
525 | ||
526 | if (atomic_read(&rth->u.dst.__refcnt)) | |
527 | goto out; | |
528 | ||
529 | ret = 1; | |
530 | if (rth->u.dst.expires && | |
531 | time_after_eq(jiffies, rth->u.dst.expires)) | |
532 | goto out; | |
533 | ||
534 | age = jiffies - rth->u.dst.lastuse; | |
535 | ret = 0; | |
536 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
537 | (age <= tmo2 && rt_valuable(rth))) | |
538 | goto out; | |
539 | ret = 1; | |
540 | out: return ret; | |
541 | } | |
542 | ||
543 | /* Bits of score are: | |
544 | * 31: very valuable | |
545 | * 30: not quite useless | |
546 | * 29..0: usage counter | |
547 | */ | |
548 | static inline u32 rt_score(struct rtable *rt) | |
549 | { | |
550 | u32 score = jiffies - rt->u.dst.lastuse; | |
551 | ||
552 | score = ~score & ~(3<<30); | |
553 | ||
554 | if (rt_valuable(rt)) | |
555 | score |= (1<<31); | |
556 | ||
557 | if (!rt->fl.iif || | |
558 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
559 | score |= (1<<30); | |
560 | ||
561 | return score; | |
562 | } | |
563 | ||
564 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
565 | { | |
714e85be AV |
566 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
567 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 568 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
569 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
570 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
571 | (fl1->oif ^ fl2->oif) | | |
572 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
573 | } |
574 | ||
1da177e4 LT |
575 | /* This runs via a timer and thus is always in BH context. */ |
576 | static void rt_check_expire(unsigned long dummy) | |
577 | { | |
bb1d23b0 ED |
578 | static unsigned int rover; |
579 | unsigned int i = rover, goal; | |
1da177e4 LT |
580 | struct rtable *rth, **rthp; |
581 | unsigned long now = jiffies; | |
bb1d23b0 ED |
582 | u64 mult; |
583 | ||
584 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
585 | if (ip_rt_gc_timeout > 1) | |
586 | do_div(mult, ip_rt_gc_timeout); | |
587 | goal = (unsigned int)mult; | |
588 | if (goal > rt_hash_mask) goal = rt_hash_mask + 1; | |
589 | for (; goal > 0; goal--) { | |
1da177e4 LT |
590 | unsigned long tmo = ip_rt_gc_timeout; |
591 | ||
592 | i = (i + 1) & rt_hash_mask; | |
593 | rthp = &rt_hash_table[i].chain; | |
594 | ||
bb1d23b0 ED |
595 | if (*rthp == 0) |
596 | continue; | |
22c047cc | 597 | spin_lock(rt_hash_lock_addr(i)); |
1da177e4 LT |
598 | while ((rth = *rthp) != NULL) { |
599 | if (rth->u.dst.expires) { | |
600 | /* Entry is expired even if it is in use */ | |
601 | if (time_before_eq(now, rth->u.dst.expires)) { | |
602 | tmo >>= 1; | |
093c2ca4 | 603 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
604 | continue; |
605 | } | |
606 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
607 | tmo >>= 1; | |
093c2ca4 | 608 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
609 | continue; |
610 | } | |
611 | ||
612 | /* Cleanup aged off entries. */ | |
093c2ca4 | 613 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 614 | rt_free(rth); |
1da177e4 | 615 | } |
22c047cc | 616 | spin_unlock(rt_hash_lock_addr(i)); |
1da177e4 LT |
617 | |
618 | /* Fallback loop breaker. */ | |
619 | if (time_after(jiffies, now)) | |
620 | break; | |
621 | } | |
622 | rover = i; | |
bb1d23b0 | 623 | mod_timer(&rt_periodic_timer, jiffies + ip_rt_gc_interval); |
1da177e4 LT |
624 | } |
625 | ||
626 | /* This can run from both BH and non-BH contexts, the latter | |
627 | * in the case of a forced flush event. | |
628 | */ | |
629 | static void rt_run_flush(unsigned long dummy) | |
630 | { | |
631 | int i; | |
632 | struct rtable *rth, *next; | |
633 | ||
634 | rt_deadline = 0; | |
635 | ||
636 | get_random_bytes(&rt_hash_rnd, 4); | |
637 | ||
638 | for (i = rt_hash_mask; i >= 0; i--) { | |
22c047cc | 639 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
640 | rth = rt_hash_table[i].chain; |
641 | if (rth) | |
642 | rt_hash_table[i].chain = NULL; | |
22c047cc | 643 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
644 | |
645 | for (; rth; rth = next) { | |
093c2ca4 | 646 | next = rth->u.dst.rt_next; |
1da177e4 LT |
647 | rt_free(rth); |
648 | } | |
649 | } | |
650 | } | |
651 | ||
652 | static DEFINE_SPINLOCK(rt_flush_lock); | |
653 | ||
654 | void rt_cache_flush(int delay) | |
655 | { | |
656 | unsigned long now = jiffies; | |
657 | int user_mode = !in_softirq(); | |
658 | ||
659 | if (delay < 0) | |
660 | delay = ip_rt_min_delay; | |
661 | ||
1da177e4 LT |
662 | spin_lock_bh(&rt_flush_lock); |
663 | ||
664 | if (del_timer(&rt_flush_timer) && delay > 0 && rt_deadline) { | |
665 | long tmo = (long)(rt_deadline - now); | |
666 | ||
667 | /* If flush timer is already running | |
668 | and flush request is not immediate (delay > 0): | |
669 | ||
670 | if deadline is not achieved, prolongate timer to "delay", | |
671 | otherwise fire it at deadline time. | |
672 | */ | |
673 | ||
674 | if (user_mode && tmo < ip_rt_max_delay-ip_rt_min_delay) | |
675 | tmo = 0; | |
e905a9ed | 676 | |
1da177e4 LT |
677 | if (delay > tmo) |
678 | delay = tmo; | |
679 | } | |
680 | ||
681 | if (delay <= 0) { | |
682 | spin_unlock_bh(&rt_flush_lock); | |
683 | rt_run_flush(0); | |
684 | return; | |
685 | } | |
686 | ||
687 | if (rt_deadline == 0) | |
688 | rt_deadline = now + ip_rt_max_delay; | |
689 | ||
690 | mod_timer(&rt_flush_timer, now+delay); | |
691 | spin_unlock_bh(&rt_flush_lock); | |
692 | } | |
693 | ||
694 | static void rt_secret_rebuild(unsigned long dummy) | |
695 | { | |
696 | unsigned long now = jiffies; | |
697 | ||
698 | rt_cache_flush(0); | |
699 | mod_timer(&rt_secret_timer, now + ip_rt_secret_interval); | |
700 | } | |
701 | ||
702 | /* | |
703 | Short description of GC goals. | |
704 | ||
705 | We want to build algorithm, which will keep routing cache | |
706 | at some equilibrium point, when number of aged off entries | |
707 | is kept approximately equal to newly generated ones. | |
708 | ||
709 | Current expiration strength is variable "expire". | |
710 | We try to adjust it dynamically, so that if networking | |
711 | is idle expires is large enough to keep enough of warm entries, | |
712 | and when load increases it reduces to limit cache size. | |
713 | */ | |
714 | ||
715 | static int rt_garbage_collect(void) | |
716 | { | |
717 | static unsigned long expire = RT_GC_TIMEOUT; | |
718 | static unsigned long last_gc; | |
719 | static int rover; | |
720 | static int equilibrium; | |
721 | struct rtable *rth, **rthp; | |
722 | unsigned long now = jiffies; | |
723 | int goal; | |
724 | ||
725 | /* | |
726 | * Garbage collection is pretty expensive, | |
727 | * do not make it too frequently. | |
728 | */ | |
729 | ||
730 | RT_CACHE_STAT_INC(gc_total); | |
731 | ||
732 | if (now - last_gc < ip_rt_gc_min_interval && | |
733 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
734 | RT_CACHE_STAT_INC(gc_ignored); | |
735 | goto out; | |
736 | } | |
737 | ||
738 | /* Calculate number of entries, which we want to expire now. */ | |
739 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
740 | (ip_rt_gc_elasticity << rt_hash_log); | |
741 | if (goal <= 0) { | |
742 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
743 | equilibrium = ipv4_dst_ops.gc_thresh; | |
744 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
745 | if (goal > 0) { | |
746 | equilibrium += min_t(unsigned int, goal / 2, rt_hash_mask + 1); | |
747 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
748 | } | |
749 | } else { | |
750 | /* We are in dangerous area. Try to reduce cache really | |
751 | * aggressively. | |
752 | */ | |
753 | goal = max_t(unsigned int, goal / 2, rt_hash_mask + 1); | |
754 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; | |
755 | } | |
756 | ||
757 | if (now - last_gc >= ip_rt_gc_min_interval) | |
758 | last_gc = now; | |
759 | ||
760 | if (goal <= 0) { | |
761 | equilibrium += goal; | |
762 | goto work_done; | |
763 | } | |
764 | ||
765 | do { | |
766 | int i, k; | |
767 | ||
768 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
769 | unsigned long tmo = expire; | |
770 | ||
771 | k = (k + 1) & rt_hash_mask; | |
772 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 773 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
774 | while ((rth = *rthp) != NULL) { |
775 | if (!rt_may_expire(rth, tmo, expire)) { | |
776 | tmo >>= 1; | |
093c2ca4 | 777 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
778 | continue; |
779 | } | |
093c2ca4 | 780 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
781 | rt_free(rth); |
782 | goal--; | |
1da177e4 | 783 | } |
22c047cc | 784 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
785 | if (goal <= 0) |
786 | break; | |
787 | } | |
788 | rover = k; | |
789 | ||
790 | if (goal <= 0) | |
791 | goto work_done; | |
792 | ||
793 | /* Goal is not achieved. We stop process if: | |
794 | ||
795 | - if expire reduced to zero. Otherwise, expire is halfed. | |
796 | - if table is not full. | |
797 | - if we are called from interrupt. | |
798 | - jiffies check is just fallback/debug loop breaker. | |
799 | We will not spin here for long time in any case. | |
800 | */ | |
801 | ||
802 | RT_CACHE_STAT_INC(gc_goal_miss); | |
803 | ||
804 | if (expire == 0) | |
805 | break; | |
806 | ||
807 | expire >>= 1; | |
808 | #if RT_CACHE_DEBUG >= 2 | |
809 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
810 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
811 | #endif | |
812 | ||
813 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
814 | goto out; | |
815 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
816 | ||
817 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
818 | goto out; | |
819 | if (net_ratelimit()) | |
820 | printk(KERN_WARNING "dst cache overflow\n"); | |
821 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
822 | return 1; | |
823 | ||
824 | work_done: | |
825 | expire += ip_rt_gc_min_interval; | |
826 | if (expire > ip_rt_gc_timeout || | |
827 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
828 | expire = ip_rt_gc_timeout; | |
829 | #if RT_CACHE_DEBUG >= 2 | |
830 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
831 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
832 | #endif | |
833 | out: return 0; | |
834 | } | |
835 | ||
836 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
837 | { | |
838 | struct rtable *rth, **rthp; | |
839 | unsigned long now; | |
840 | struct rtable *cand, **candp; | |
841 | u32 min_score; | |
842 | int chain_length; | |
843 | int attempts = !in_softirq(); | |
844 | ||
845 | restart: | |
846 | chain_length = 0; | |
847 | min_score = ~(u32)0; | |
848 | cand = NULL; | |
849 | candp = NULL; | |
850 | now = jiffies; | |
851 | ||
852 | rthp = &rt_hash_table[hash].chain; | |
853 | ||
22c047cc | 854 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 855 | while ((rth = *rthp) != NULL) { |
1da177e4 | 856 | if (compare_keys(&rth->fl, &rt->fl)) { |
1da177e4 | 857 | /* Put it first */ |
093c2ca4 | 858 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
859 | /* |
860 | * Since lookup is lockfree, the deletion | |
861 | * must be visible to another weakly ordered CPU before | |
862 | * the insertion at the start of the hash chain. | |
863 | */ | |
093c2ca4 | 864 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
865 | rt_hash_table[hash].chain); |
866 | /* | |
867 | * Since lookup is lockfree, the update writes | |
868 | * must be ordered for consistency on SMP. | |
869 | */ | |
870 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
871 | ||
872 | rth->u.dst.__use++; | |
873 | dst_hold(&rth->u.dst); | |
874 | rth->u.dst.lastuse = now; | |
22c047cc | 875 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
876 | |
877 | rt_drop(rt); | |
878 | *rp = rth; | |
879 | return 0; | |
880 | } | |
881 | ||
882 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
883 | u32 score = rt_score(rth); | |
884 | ||
885 | if (score <= min_score) { | |
886 | cand = rth; | |
887 | candp = rthp; | |
888 | min_score = score; | |
889 | } | |
890 | } | |
891 | ||
892 | chain_length++; | |
893 | ||
093c2ca4 | 894 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
895 | } |
896 | ||
897 | if (cand) { | |
898 | /* ip_rt_gc_elasticity used to be average length of chain | |
899 | * length, when exceeded gc becomes really aggressive. | |
900 | * | |
901 | * The second limit is less certain. At the moment it allows | |
902 | * only 2 entries per bucket. We will see. | |
903 | */ | |
904 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 905 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
906 | rt_free(cand); |
907 | } | |
908 | } | |
909 | ||
910 | /* Try to bind route to arp only if it is output | |
911 | route or unicast forwarding path. | |
912 | */ | |
913 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
914 | int err = arp_bind_neighbour(&rt->u.dst); | |
915 | if (err) { | |
22c047cc | 916 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
917 | |
918 | if (err != -ENOBUFS) { | |
919 | rt_drop(rt); | |
920 | return err; | |
921 | } | |
922 | ||
923 | /* Neighbour tables are full and nothing | |
924 | can be released. Try to shrink route cache, | |
925 | it is most likely it holds some neighbour records. | |
926 | */ | |
927 | if (attempts-- > 0) { | |
928 | int saved_elasticity = ip_rt_gc_elasticity; | |
929 | int saved_int = ip_rt_gc_min_interval; | |
930 | ip_rt_gc_elasticity = 1; | |
931 | ip_rt_gc_min_interval = 0; | |
932 | rt_garbage_collect(); | |
933 | ip_rt_gc_min_interval = saved_int; | |
934 | ip_rt_gc_elasticity = saved_elasticity; | |
935 | goto restart; | |
936 | } | |
937 | ||
938 | if (net_ratelimit()) | |
939 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
940 | rt_drop(rt); | |
941 | return -ENOBUFS; | |
942 | } | |
943 | } | |
944 | ||
093c2ca4 | 945 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
1da177e4 | 946 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 947 | if (rt->u.dst.rt_next) { |
1da177e4 LT |
948 | struct rtable *trt; |
949 | printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash, | |
950 | NIPQUAD(rt->rt_dst)); | |
093c2ca4 | 951 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
1da177e4 LT |
952 | printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst)); |
953 | printk("\n"); | |
954 | } | |
955 | #endif | |
956 | rt_hash_table[hash].chain = rt; | |
22c047cc | 957 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
958 | *rp = rt; |
959 | return 0; | |
960 | } | |
961 | ||
962 | void rt_bind_peer(struct rtable *rt, int create) | |
963 | { | |
964 | static DEFINE_SPINLOCK(rt_peer_lock); | |
965 | struct inet_peer *peer; | |
966 | ||
967 | peer = inet_getpeer(rt->rt_dst, create); | |
968 | ||
969 | spin_lock_bh(&rt_peer_lock); | |
970 | if (rt->peer == NULL) { | |
971 | rt->peer = peer; | |
972 | peer = NULL; | |
973 | } | |
974 | spin_unlock_bh(&rt_peer_lock); | |
975 | if (peer) | |
976 | inet_putpeer(peer); | |
977 | } | |
978 | ||
979 | /* | |
980 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
981 | * we still can generate some output. | |
982 | * Random ID selection looks a bit dangerous because we have no chances to | |
983 | * select ID being unique in a reasonable period of time. | |
984 | * But broken packet identifier may be better than no packet at all. | |
985 | */ | |
986 | static void ip_select_fb_ident(struct iphdr *iph) | |
987 | { | |
988 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
989 | static u32 ip_fallback_id; | |
990 | u32 salt; | |
991 | ||
992 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 993 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
994 | iph->id = htons(salt & 0xFFFF); |
995 | ip_fallback_id = salt; | |
996 | spin_unlock_bh(&ip_fb_id_lock); | |
997 | } | |
998 | ||
999 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1000 | { | |
1001 | struct rtable *rt = (struct rtable *) dst; | |
1002 | ||
1003 | if (rt) { | |
1004 | if (rt->peer == NULL) | |
1005 | rt_bind_peer(rt, 1); | |
1006 | ||
1007 | /* If peer is attached to destination, it is never detached, | |
1008 | so that we need not to grab a lock to dereference it. | |
1009 | */ | |
1010 | if (rt->peer) { | |
1011 | iph->id = htons(inet_getid(rt->peer, more)); | |
1012 | return; | |
1013 | } | |
1014 | } else | |
e905a9ed | 1015 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1016 | __builtin_return_address(0)); |
1da177e4 LT |
1017 | |
1018 | ip_select_fb_ident(iph); | |
1019 | } | |
1020 | ||
1021 | static void rt_del(unsigned hash, struct rtable *rt) | |
1022 | { | |
1023 | struct rtable **rthp; | |
1024 | ||
22c047cc | 1025 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1026 | ip_rt_put(rt); |
1027 | for (rthp = &rt_hash_table[hash].chain; *rthp; | |
093c2ca4 | 1028 | rthp = &(*rthp)->u.dst.rt_next) |
1da177e4 | 1029 | if (*rthp == rt) { |
093c2ca4 | 1030 | *rthp = rt->u.dst.rt_next; |
1da177e4 LT |
1031 | rt_free(rt); |
1032 | break; | |
1033 | } | |
22c047cc | 1034 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1035 | } |
1036 | ||
f7655229 AV |
1037 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1038 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1039 | { |
1040 | int i, k; | |
1041 | struct in_device *in_dev = in_dev_get(dev); | |
1042 | struct rtable *rth, **rthp; | |
f7655229 | 1043 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1044 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1045 | struct netevent_redirect netevent; |
1da177e4 | 1046 | |
1da177e4 LT |
1047 | if (!in_dev) |
1048 | return; | |
1049 | ||
1050 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) | |
1051 | || MULTICAST(new_gw) || BADCLASS(new_gw) || ZERONET(new_gw)) | |
1052 | goto reject_redirect; | |
1053 | ||
1054 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1055 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1056 | goto reject_redirect; | |
1057 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1058 | goto reject_redirect; | |
1059 | } else { | |
1060 | if (inet_addr_type(new_gw) != RTN_UNICAST) | |
1061 | goto reject_redirect; | |
1062 | } | |
1063 | ||
1064 | for (i = 0; i < 2; i++) { | |
1065 | for (k = 0; k < 2; k++) { | |
8c7bc840 | 1066 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]); |
1da177e4 LT |
1067 | |
1068 | rthp=&rt_hash_table[hash].chain; | |
1069 | ||
1070 | rcu_read_lock(); | |
1071 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1072 | struct rtable *rt; | |
1073 | ||
1074 | if (rth->fl.fl4_dst != daddr || | |
1075 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 LT |
1076 | rth->fl.oif != ikeys[k] || |
1077 | rth->fl.iif != 0) { | |
093c2ca4 | 1078 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1079 | continue; |
1080 | } | |
1081 | ||
1082 | if (rth->rt_dst != daddr || | |
1083 | rth->rt_src != saddr || | |
1084 | rth->u.dst.error || | |
1085 | rth->rt_gateway != old_gw || | |
1086 | rth->u.dst.dev != dev) | |
1087 | break; | |
1088 | ||
1089 | dst_hold(&rth->u.dst); | |
1090 | rcu_read_unlock(); | |
1091 | ||
1092 | rt = dst_alloc(&ipv4_dst_ops); | |
1093 | if (rt == NULL) { | |
1094 | ip_rt_put(rth); | |
1095 | in_dev_put(in_dev); | |
1096 | return; | |
1097 | } | |
1098 | ||
1099 | /* Copy all the information. */ | |
1100 | *rt = *rth; | |
e905a9ed | 1101 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
1da177e4 LT |
1102 | rt->u.dst.__use = 1; |
1103 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1104 | rt->u.dst.child = NULL; | |
1105 | if (rt->u.dst.dev) | |
1106 | dev_hold(rt->u.dst.dev); | |
1107 | if (rt->idev) | |
1108 | in_dev_hold(rt->idev); | |
1109 | rt->u.dst.obsolete = 0; | |
1110 | rt->u.dst.lastuse = jiffies; | |
1111 | rt->u.dst.path = &rt->u.dst; | |
1112 | rt->u.dst.neighbour = NULL; | |
1113 | rt->u.dst.hh = NULL; | |
1114 | rt->u.dst.xfrm = NULL; | |
1115 | ||
1116 | rt->rt_flags |= RTCF_REDIRECTED; | |
1117 | ||
1118 | /* Gateway is different ... */ | |
1119 | rt->rt_gateway = new_gw; | |
1120 | ||
1121 | /* Redirect received -> path was valid */ | |
1122 | dst_confirm(&rth->u.dst); | |
1123 | ||
1124 | if (rt->peer) | |
1125 | atomic_inc(&rt->peer->refcnt); | |
1126 | ||
1127 | if (arp_bind_neighbour(&rt->u.dst) || | |
1128 | !(rt->u.dst.neighbour->nud_state & | |
1129 | NUD_VALID)) { | |
1130 | if (rt->u.dst.neighbour) | |
1131 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1132 | ip_rt_put(rth); | |
1133 | rt_drop(rt); | |
1134 | goto do_next; | |
1135 | } | |
e905a9ed | 1136 | |
8d71740c TT |
1137 | netevent.old = &rth->u.dst; |
1138 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1139 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1140 | &netevent); | |
1da177e4 LT |
1141 | |
1142 | rt_del(hash, rth); | |
1143 | if (!rt_intern_hash(hash, rt, &rt)) | |
1144 | ip_rt_put(rt); | |
1145 | goto do_next; | |
1146 | } | |
1147 | rcu_read_unlock(); | |
1148 | do_next: | |
1149 | ; | |
1150 | } | |
1151 | } | |
1152 | in_dev_put(in_dev); | |
1153 | return; | |
1154 | ||
1155 | reject_redirect: | |
1156 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1157 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
1158 | printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about " | |
1159 | "%u.%u.%u.%u ignored.\n" | |
cef2685e | 1160 | " Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n", |
1da177e4 | 1161 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1162 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1163 | #endif |
1164 | in_dev_put(in_dev); | |
1165 | } | |
1166 | ||
1167 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1168 | { | |
1169 | struct rtable *rt = (struct rtable*)dst; | |
1170 | struct dst_entry *ret = dst; | |
1171 | ||
1172 | if (rt) { | |
1173 | if (dst->obsolete) { | |
1174 | ip_rt_put(rt); | |
1175 | ret = NULL; | |
1176 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1177 | rt->u.dst.expires) { | |
8c7bc840 AV |
1178 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
1179 | rt->fl.oif); | |
1da177e4 LT |
1180 | #if RT_CACHE_DEBUG >= 1 |
1181 | printk(KERN_DEBUG "ip_rt_advice: redirect to " | |
1182 | "%u.%u.%u.%u/%02x dropped\n", | |
1183 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); | |
1184 | #endif | |
1185 | rt_del(hash, rt); | |
1186 | ret = NULL; | |
1187 | } | |
1188 | } | |
1189 | return ret; | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * Algorithm: | |
1194 | * 1. The first ip_rt_redirect_number redirects are sent | |
1195 | * with exponential backoff, then we stop sending them at all, | |
1196 | * assuming that the host ignores our redirects. | |
1197 | * 2. If we did not see packets requiring redirects | |
1198 | * during ip_rt_redirect_silence, we assume that the host | |
1199 | * forgot redirected route and start to send redirects again. | |
1200 | * | |
1201 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1202 | * in icmp.c. | |
1203 | * | |
1204 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1205 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1206 | */ | |
1207 | ||
1208 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1209 | { | |
1210 | struct rtable *rt = (struct rtable*)skb->dst; | |
1211 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); | |
1212 | ||
1213 | if (!in_dev) | |
1214 | return; | |
1215 | ||
1216 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1217 | goto out; | |
1218 | ||
1219 | /* No redirected packets during ip_rt_redirect_silence; | |
1220 | * reset the algorithm. | |
1221 | */ | |
1222 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1223 | rt->u.dst.rate_tokens = 0; | |
1224 | ||
1225 | /* Too many ignored redirects; do not send anything | |
1226 | * set u.dst.rate_last to the last seen redirected packet. | |
1227 | */ | |
1228 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1229 | rt->u.dst.rate_last = jiffies; | |
1230 | goto out; | |
1231 | } | |
1232 | ||
1233 | /* Check for load limit; set rate_last to the latest sent | |
1234 | * redirect. | |
1235 | */ | |
14fb8a76 LY |
1236 | if (rt->u.dst.rate_tokens == 0 || |
1237 | time_after(jiffies, | |
1da177e4 LT |
1238 | (rt->u.dst.rate_last + |
1239 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1240 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1241 | rt->u.dst.rate_last = jiffies; | |
1242 | ++rt->u.dst.rate_tokens; | |
1243 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1244 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1245 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1246 | net_ratelimit()) | |
1247 | printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores " | |
1248 | "redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n", | |
1249 | NIPQUAD(rt->rt_src), rt->rt_iif, | |
1250 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1251 | #endif | |
1252 | } | |
1253 | out: | |
e905a9ed | 1254 | in_dev_put(in_dev); |
1da177e4 LT |
1255 | } |
1256 | ||
1257 | static int ip_error(struct sk_buff *skb) | |
1258 | { | |
1259 | struct rtable *rt = (struct rtable*)skb->dst; | |
1260 | unsigned long now; | |
1261 | int code; | |
1262 | ||
1263 | switch (rt->u.dst.error) { | |
1264 | case EINVAL: | |
1265 | default: | |
1266 | goto out; | |
1267 | case EHOSTUNREACH: | |
1268 | code = ICMP_HOST_UNREACH; | |
1269 | break; | |
1270 | case ENETUNREACH: | |
1271 | code = ICMP_NET_UNREACH; | |
1272 | break; | |
1273 | case EACCES: | |
1274 | code = ICMP_PKT_FILTERED; | |
1275 | break; | |
1276 | } | |
1277 | ||
1278 | now = jiffies; | |
1279 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1280 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1281 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1282 | rt->u.dst.rate_last = now; | |
1283 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1284 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1285 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1286 | } | |
1287 | ||
1288 | out: kfree_skb(skb); | |
1289 | return 0; | |
e905a9ed | 1290 | } |
1da177e4 LT |
1291 | |
1292 | /* | |
1293 | * The last two values are not from the RFC but | |
1294 | * are needed for AMPRnet AX.25 paths. | |
1295 | */ | |
1296 | ||
9b5b5cff | 1297 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1298 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1299 | ||
1300 | static __inline__ unsigned short guess_mtu(unsigned short old_mtu) | |
1301 | { | |
1302 | int i; | |
e905a9ed | 1303 | |
1da177e4 LT |
1304 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1305 | if (old_mtu > mtu_plateau[i]) | |
1306 | return mtu_plateau[i]; | |
1307 | return 68; | |
1308 | } | |
1309 | ||
1310 | unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu) | |
1311 | { | |
1312 | int i; | |
1313 | unsigned short old_mtu = ntohs(iph->tot_len); | |
1314 | struct rtable *rth; | |
e448515c AV |
1315 | __be32 skeys[2] = { iph->saddr, 0, }; |
1316 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1317 | unsigned short est_mtu = 0; |
1318 | ||
1319 | if (ipv4_config.no_pmtu_disc) | |
1320 | return 0; | |
1321 | ||
1322 | for (i = 0; i < 2; i++) { | |
8c7bc840 | 1323 | unsigned hash = rt_hash(daddr, skeys[i], 0); |
1da177e4 LT |
1324 | |
1325 | rcu_read_lock(); | |
1326 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 1327 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
1328 | if (rth->fl.fl4_dst == daddr && |
1329 | rth->fl.fl4_src == skeys[i] && | |
1330 | rth->rt_dst == daddr && | |
1331 | rth->rt_src == iph->saddr && | |
1da177e4 LT |
1332 | rth->fl.iif == 0 && |
1333 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU))) { | |
1334 | unsigned short mtu = new_mtu; | |
1335 | ||
1336 | if (new_mtu < 68 || new_mtu >= old_mtu) { | |
1337 | ||
1338 | /* BSD 4.2 compatibility hack :-( */ | |
1339 | if (mtu == 0 && | |
1340 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && | |
1341 | old_mtu >= 68 + (iph->ihl << 2)) | |
1342 | old_mtu -= iph->ihl << 2; | |
1343 | ||
1344 | mtu = guess_mtu(old_mtu); | |
1345 | } | |
1346 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { | |
e905a9ed | 1347 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { |
1da177e4 LT |
1348 | dst_confirm(&rth->u.dst); |
1349 | if (mtu < ip_rt_min_pmtu) { | |
1350 | mtu = ip_rt_min_pmtu; | |
1351 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1352 | (1 << RTAX_MTU); | |
1353 | } | |
1354 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1355 | dst_set_expires(&rth->u.dst, | |
1356 | ip_rt_mtu_expires); | |
1357 | } | |
1358 | est_mtu = mtu; | |
1359 | } | |
1360 | } | |
1361 | } | |
1362 | rcu_read_unlock(); | |
1363 | } | |
1364 | return est_mtu ? : new_mtu; | |
1365 | } | |
1366 | ||
1367 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1368 | { | |
1369 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && | |
1370 | !(dst_metric_locked(dst, RTAX_MTU))) { | |
1371 | if (mtu < ip_rt_min_pmtu) { | |
1372 | mtu = ip_rt_min_pmtu; | |
1373 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1374 | } | |
1375 | dst->metrics[RTAX_MTU-1] = mtu; | |
1376 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1377 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1378 | } |
1379 | } | |
1380 | ||
1381 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1382 | { | |
1383 | return NULL; | |
1384 | } | |
1385 | ||
1386 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1387 | { | |
1388 | struct rtable *rt = (struct rtable *) dst; | |
1389 | struct inet_peer *peer = rt->peer; | |
1390 | struct in_device *idev = rt->idev; | |
1391 | ||
1392 | if (peer) { | |
1393 | rt->peer = NULL; | |
1394 | inet_putpeer(peer); | |
1395 | } | |
1396 | ||
1397 | if (idev) { | |
1398 | rt->idev = NULL; | |
1399 | in_dev_put(idev); | |
1400 | } | |
1401 | } | |
1402 | ||
1403 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1404 | int how) | |
1405 | { | |
1406 | struct rtable *rt = (struct rtable *) dst; | |
1407 | struct in_device *idev = rt->idev; | |
1408 | if (dev != &loopback_dev && idev && idev->dev == dev) { | |
1409 | struct in_device *loopback_idev = in_dev_get(&loopback_dev); | |
1410 | if (loopback_idev) { | |
1411 | rt->idev = loopback_idev; | |
1412 | in_dev_put(idev); | |
1413 | } | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | static void ipv4_link_failure(struct sk_buff *skb) | |
1418 | { | |
1419 | struct rtable *rt; | |
1420 | ||
1421 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1422 | ||
1423 | rt = (struct rtable *) skb->dst; | |
1424 | if (rt) | |
1425 | dst_set_expires(&rt->u.dst, 0); | |
1426 | } | |
1427 | ||
1428 | static int ip_rt_bug(struct sk_buff *skb) | |
1429 | { | |
1430 | printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n", | |
eddc9ec5 | 1431 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
1da177e4 LT |
1432 | skb->dev ? skb->dev->name : "?"); |
1433 | kfree_skb(skb); | |
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | We do not cache source address of outgoing interface, | |
1439 | because it is used only by IP RR, TS and SRR options, | |
1440 | so that it out of fast path. | |
1441 | ||
1442 | BTW remember: "addr" is allowed to be not aligned | |
1443 | in IP options! | |
1444 | */ | |
1445 | ||
1446 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1447 | { | |
a61ced5d | 1448 | __be32 src; |
1da177e4 LT |
1449 | struct fib_result res; |
1450 | ||
1451 | if (rt->fl.iif == 0) | |
1452 | src = rt->rt_src; | |
1453 | else if (fib_lookup(&rt->fl, &res) == 0) { | |
1454 | src = FIB_RES_PREFSRC(res); | |
1455 | fib_res_put(&res); | |
1456 | } else | |
1457 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1458 | RT_SCOPE_UNIVERSE); | |
1459 | memcpy(addr, &src, 4); | |
1460 | } | |
1461 | ||
1462 | #ifdef CONFIG_NET_CLS_ROUTE | |
1463 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1464 | { | |
1465 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1466 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1467 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1468 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1469 | } | |
1470 | #endif | |
1471 | ||
1472 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1473 | { | |
1474 | struct fib_info *fi = res->fi; | |
1475 | ||
1476 | if (fi) { | |
1477 | if (FIB_RES_GW(*res) && | |
1478 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1479 | rt->rt_gateway = FIB_RES_GW(*res); | |
1480 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1481 | sizeof(rt->u.dst.metrics)); | |
1482 | if (fi->fib_mtu == 0) { | |
1483 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
1484 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && | |
1485 | rt->rt_gateway != rt->rt_dst && | |
1486 | rt->u.dst.dev->mtu > 576) | |
1487 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1488 | } | |
1489 | #ifdef CONFIG_NET_CLS_ROUTE | |
1490 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1491 | #endif | |
1492 | } else | |
1493 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1494 | ||
1495 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1496 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; | |
1497 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) | |
1498 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; | |
1499 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) | |
1500 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, | |
1501 | ip_rt_min_advmss); | |
1502 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) | |
1503 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; | |
1504 | ||
1505 | #ifdef CONFIG_NET_CLS_ROUTE | |
1506 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1507 | set_class_tag(rt, fib_rules_tclass(res)); | |
1508 | #endif | |
1509 | set_class_tag(rt, itag); | |
1510 | #endif | |
e905a9ed | 1511 | rt->rt_type = res->type; |
1da177e4 LT |
1512 | } |
1513 | ||
9e12bb22 | 1514 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1515 | u8 tos, struct net_device *dev, int our) |
1516 | { | |
1517 | unsigned hash; | |
1518 | struct rtable *rth; | |
a61ced5d | 1519 | __be32 spec_dst; |
1da177e4 LT |
1520 | struct in_device *in_dev = in_dev_get(dev); |
1521 | u32 itag = 0; | |
1522 | ||
1523 | /* Primary sanity checks. */ | |
1524 | ||
1525 | if (in_dev == NULL) | |
1526 | return -EINVAL; | |
1527 | ||
1528 | if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr) || | |
1529 | skb->protocol != htons(ETH_P_IP)) | |
1530 | goto e_inval; | |
1531 | ||
1532 | if (ZERONET(saddr)) { | |
1533 | if (!LOCAL_MCAST(daddr)) | |
1534 | goto e_inval; | |
1535 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1536 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1537 | dev, &spec_dst, &itag) < 0) | |
1538 | goto e_inval; | |
1539 | ||
1540 | rth = dst_alloc(&ipv4_dst_ops); | |
1541 | if (!rth) | |
1542 | goto e_nobufs; | |
1543 | ||
1544 | rth->u.dst.output= ip_rt_bug; | |
1545 | ||
1546 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1547 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1548 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1549 | rth->u.dst.flags |= DST_NOPOLICY; |
1550 | rth->fl.fl4_dst = daddr; | |
1551 | rth->rt_dst = daddr; | |
1552 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1553 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1554 | rth->fl.fl4_src = saddr; |
1555 | rth->rt_src = saddr; | |
1556 | #ifdef CONFIG_NET_CLS_ROUTE | |
1557 | rth->u.dst.tclassid = itag; | |
1558 | #endif | |
1559 | rth->rt_iif = | |
1560 | rth->fl.iif = dev->ifindex; | |
1561 | rth->u.dst.dev = &loopback_dev; | |
1562 | dev_hold(rth->u.dst.dev); | |
1563 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1564 | rth->fl.oif = 0; | |
1565 | rth->rt_gateway = daddr; | |
1566 | rth->rt_spec_dst= spec_dst; | |
1567 | rth->rt_type = RTN_MULTICAST; | |
1568 | rth->rt_flags = RTCF_MULTICAST; | |
1569 | if (our) { | |
1570 | rth->u.dst.input= ip_local_deliver; | |
1571 | rth->rt_flags |= RTCF_LOCAL; | |
1572 | } | |
1573 | ||
1574 | #ifdef CONFIG_IP_MROUTE | |
1575 | if (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev)) | |
1576 | rth->u.dst.input = ip_mr_input; | |
1577 | #endif | |
1578 | RT_CACHE_STAT_INC(in_slow_mc); | |
1579 | ||
1580 | in_dev_put(in_dev); | |
8c7bc840 | 1581 | hash = rt_hash(daddr, saddr, dev->ifindex); |
1da177e4 LT |
1582 | return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst); |
1583 | ||
1584 | e_nobufs: | |
1585 | in_dev_put(in_dev); | |
1586 | return -ENOBUFS; | |
1587 | ||
1588 | e_inval: | |
1589 | in_dev_put(in_dev); | |
1590 | return -EINVAL; | |
1591 | } | |
1592 | ||
1593 | ||
1594 | static void ip_handle_martian_source(struct net_device *dev, | |
1595 | struct in_device *in_dev, | |
1596 | struct sk_buff *skb, | |
9e12bb22 AV |
1597 | __be32 daddr, |
1598 | __be32 saddr) | |
1da177e4 LT |
1599 | { |
1600 | RT_CACHE_STAT_INC(in_martian_src); | |
1601 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1602 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1603 | /* | |
1604 | * RFC1812 recommendation, if source is martian, | |
1605 | * the only hint is MAC header. | |
1606 | */ | |
1607 | printk(KERN_WARNING "martian source %u.%u.%u.%u from " | |
1608 | "%u.%u.%u.%u, on dev %s\n", | |
1609 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
98e399f8 | 1610 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1611 | int i; |
98e399f8 | 1612 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1613 | printk(KERN_WARNING "ll header: "); |
1614 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1615 | printk("%02x", *p); | |
1616 | if (i < (dev->hard_header_len - 1)) | |
1617 | printk(":"); | |
1618 | } | |
1619 | printk("\n"); | |
1620 | } | |
1621 | } | |
1622 | #endif | |
1623 | } | |
1624 | ||
e905a9ed YH |
1625 | static inline int __mkroute_input(struct sk_buff *skb, |
1626 | struct fib_result* res, | |
1627 | struct in_device *in_dev, | |
9e12bb22 | 1628 | __be32 daddr, __be32 saddr, u32 tos, |
e905a9ed | 1629 | struct rtable **result) |
1da177e4 LT |
1630 | { |
1631 | ||
1632 | struct rtable *rth; | |
1633 | int err; | |
1634 | struct in_device *out_dev; | |
1635 | unsigned flags = 0; | |
d9c9df8c AV |
1636 | __be32 spec_dst; |
1637 | u32 itag; | |
1da177e4 LT |
1638 | |
1639 | /* get a working reference to the output device */ | |
1640 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1641 | if (out_dev == NULL) { | |
1642 | if (net_ratelimit()) | |
1643 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1644 | "_slow(). Please, report\n"); | |
1645 | return -EINVAL; | |
1646 | } | |
1647 | ||
1648 | ||
e905a9ed | 1649 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1650 | in_dev->dev, &spec_dst, &itag); |
1651 | if (err < 0) { | |
e905a9ed | 1652 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1653 | saddr); |
e905a9ed | 1654 | |
1da177e4 LT |
1655 | err = -EINVAL; |
1656 | goto cleanup; | |
1657 | } | |
1658 | ||
1659 | if (err) | |
1660 | flags |= RTCF_DIRECTSRC; | |
1661 | ||
1662 | if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) && | |
1663 | (IN_DEV_SHARED_MEDIA(out_dev) || | |
1664 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1665 | flags |= RTCF_DOREDIRECT; | |
1666 | ||
1667 | if (skb->protocol != htons(ETH_P_IP)) { | |
1668 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1669 | * invalid for proxy arp. DNAT routes are always valid. | |
1670 | */ | |
1671 | if (out_dev == in_dev && !(flags & RTCF_DNAT)) { | |
1672 | err = -EINVAL; | |
1673 | goto cleanup; | |
1674 | } | |
1675 | } | |
1676 | ||
1677 | ||
1678 | rth = dst_alloc(&ipv4_dst_ops); | |
1679 | if (!rth) { | |
1680 | err = -ENOBUFS; | |
1681 | goto cleanup; | |
1682 | } | |
1683 | ||
ce723d8e | 1684 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1685 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1686 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1687 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1688 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1689 | rth->u.dst.flags |= DST_NOXFRM; |
1690 | rth->fl.fl4_dst = daddr; | |
1691 | rth->rt_dst = daddr; | |
1692 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1693 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1694 | rth->fl.fl4_src = saddr; |
1695 | rth->rt_src = saddr; | |
1696 | rth->rt_gateway = daddr; | |
1697 | rth->rt_iif = | |
1698 | rth->fl.iif = in_dev->dev->ifindex; | |
1699 | rth->u.dst.dev = (out_dev)->dev; | |
1700 | dev_hold(rth->u.dst.dev); | |
1701 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1702 | rth->fl.oif = 0; | |
1703 | rth->rt_spec_dst= spec_dst; | |
1704 | ||
1705 | rth->u.dst.input = ip_forward; | |
1706 | rth->u.dst.output = ip_output; | |
1707 | ||
1708 | rt_set_nexthop(rth, res, itag); | |
1709 | ||
1710 | rth->rt_flags = flags; | |
1711 | ||
1712 | *result = rth; | |
1713 | err = 0; | |
1714 | cleanup: | |
1715 | /* release the working reference to the output device */ | |
1716 | in_dev_put(out_dev); | |
1717 | return err; | |
e905a9ed | 1718 | } |
1da177e4 | 1719 | |
e06e7c61 DM |
1720 | static inline int ip_mkroute_input(struct sk_buff *skb, |
1721 | struct fib_result* res, | |
1722 | const struct flowi *fl, | |
1723 | struct in_device *in_dev, | |
1724 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1725 | { |
7abaa27c | 1726 | struct rtable* rth = NULL; |
1da177e4 LT |
1727 | int err; |
1728 | unsigned hash; | |
1729 | ||
1730 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1731 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
1732 | fib_select_multipath(fl, res); | |
1733 | #endif | |
1734 | ||
1735 | /* create a routing cache entry */ | |
1736 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1737 | if (err) | |
1738 | return err; | |
1da177e4 LT |
1739 | |
1740 | /* put it into the cache */ | |
8c7bc840 | 1741 | hash = rt_hash(daddr, saddr, fl->iif); |
e905a9ed | 1742 | return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
1da177e4 LT |
1743 | } |
1744 | ||
1da177e4 LT |
1745 | /* |
1746 | * NOTE. We drop all the packets that has local source | |
1747 | * addresses, because every properly looped back packet | |
1748 | * must have correct destination already attached by output routine. | |
1749 | * | |
1750 | * Such approach solves two big problems: | |
1751 | * 1. Not simplex devices are handled properly. | |
1752 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
1753 | */ | |
1754 | ||
9e12bb22 | 1755 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1756 | u8 tos, struct net_device *dev) |
1757 | { | |
1758 | struct fib_result res; | |
1759 | struct in_device *in_dev = in_dev_get(dev); | |
1760 | struct flowi fl = { .nl_u = { .ip4_u = | |
1761 | { .daddr = daddr, | |
1762 | .saddr = saddr, | |
1763 | .tos = tos, | |
1764 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1765 | } }, |
47dcf0cb | 1766 | .mark = skb->mark, |
1da177e4 LT |
1767 | .iif = dev->ifindex }; |
1768 | unsigned flags = 0; | |
1769 | u32 itag = 0; | |
1770 | struct rtable * rth; | |
1771 | unsigned hash; | |
9e12bb22 | 1772 | __be32 spec_dst; |
1da177e4 LT |
1773 | int err = -EINVAL; |
1774 | int free_res = 0; | |
1775 | ||
1776 | /* IP on this device is disabled. */ | |
1777 | ||
1778 | if (!in_dev) | |
1779 | goto out; | |
1780 | ||
1781 | /* Check for the most weird martians, which can be not detected | |
1782 | by fib_lookup. | |
1783 | */ | |
1784 | ||
1785 | if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr)) | |
1786 | goto martian_source; | |
1787 | ||
e448515c | 1788 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1789 | goto brd_input; |
1790 | ||
1791 | /* Accept zero addresses only to limited broadcast; | |
1792 | * I even do not know to fix it or not. Waiting for complains :-) | |
1793 | */ | |
1794 | if (ZERONET(saddr)) | |
1795 | goto martian_source; | |
1796 | ||
1797 | if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr)) | |
1798 | goto martian_destination; | |
1799 | ||
1800 | /* | |
1801 | * Now we are ready to route packet. | |
1802 | */ | |
1803 | if ((err = fib_lookup(&fl, &res)) != 0) { | |
1804 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1805 | goto e_hostunreach; |
1da177e4 LT |
1806 | goto no_route; |
1807 | } | |
1808 | free_res = 1; | |
1809 | ||
1810 | RT_CACHE_STAT_INC(in_slow_tot); | |
1811 | ||
1812 | if (res.type == RTN_BROADCAST) | |
1813 | goto brd_input; | |
1814 | ||
1815 | if (res.type == RTN_LOCAL) { | |
1816 | int result; | |
1817 | result = fib_validate_source(saddr, daddr, tos, | |
1818 | loopback_dev.ifindex, | |
1819 | dev, &spec_dst, &itag); | |
1820 | if (result < 0) | |
1821 | goto martian_source; | |
1822 | if (result) | |
1823 | flags |= RTCF_DIRECTSRC; | |
1824 | spec_dst = daddr; | |
1825 | goto local_input; | |
1826 | } | |
1827 | ||
1828 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1829 | goto e_hostunreach; |
1da177e4 LT |
1830 | if (res.type != RTN_UNICAST) |
1831 | goto martian_destination; | |
1832 | ||
1833 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1834 | if (err == -ENOBUFS) | |
1835 | goto e_nobufs; | |
1836 | if (err == -EINVAL) | |
1837 | goto e_inval; | |
e905a9ed | 1838 | |
1da177e4 LT |
1839 | done: |
1840 | in_dev_put(in_dev); | |
1841 | if (free_res) | |
1842 | fib_res_put(&res); | |
1843 | out: return err; | |
1844 | ||
1845 | brd_input: | |
1846 | if (skb->protocol != htons(ETH_P_IP)) | |
1847 | goto e_inval; | |
1848 | ||
1849 | if (ZERONET(saddr)) | |
1850 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1851 | else { | |
1852 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
1853 | &itag); | |
1854 | if (err < 0) | |
1855 | goto martian_source; | |
1856 | if (err) | |
1857 | flags |= RTCF_DIRECTSRC; | |
1858 | } | |
1859 | flags |= RTCF_BROADCAST; | |
1860 | res.type = RTN_BROADCAST; | |
1861 | RT_CACHE_STAT_INC(in_brd); | |
1862 | ||
1863 | local_input: | |
1864 | rth = dst_alloc(&ipv4_dst_ops); | |
1865 | if (!rth) | |
1866 | goto e_nobufs; | |
1867 | ||
1868 | rth->u.dst.output= ip_rt_bug; | |
1869 | ||
1870 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1871 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1872 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1873 | rth->u.dst.flags |= DST_NOPOLICY; |
1874 | rth->fl.fl4_dst = daddr; | |
1875 | rth->rt_dst = daddr; | |
1876 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1877 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1878 | rth->fl.fl4_src = saddr; |
1879 | rth->rt_src = saddr; | |
1880 | #ifdef CONFIG_NET_CLS_ROUTE | |
1881 | rth->u.dst.tclassid = itag; | |
1882 | #endif | |
1883 | rth->rt_iif = | |
1884 | rth->fl.iif = dev->ifindex; | |
1885 | rth->u.dst.dev = &loopback_dev; | |
1886 | dev_hold(rth->u.dst.dev); | |
1887 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1888 | rth->rt_gateway = daddr; | |
1889 | rth->rt_spec_dst= spec_dst; | |
1890 | rth->u.dst.input= ip_local_deliver; | |
1891 | rth->rt_flags = flags|RTCF_LOCAL; | |
1892 | if (res.type == RTN_UNREACHABLE) { | |
1893 | rth->u.dst.input= ip_error; | |
1894 | rth->u.dst.error= -err; | |
1895 | rth->rt_flags &= ~RTCF_LOCAL; | |
1896 | } | |
1897 | rth->rt_type = res.type; | |
8c7bc840 | 1898 | hash = rt_hash(daddr, saddr, fl.iif); |
1da177e4 LT |
1899 | err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
1900 | goto done; | |
1901 | ||
1902 | no_route: | |
1903 | RT_CACHE_STAT_INC(in_no_route); | |
1904 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
1905 | res.type = RTN_UNREACHABLE; | |
1906 | goto local_input; | |
1907 | ||
1908 | /* | |
1909 | * Do not cache martian addresses: they should be logged (RFC1812) | |
1910 | */ | |
1911 | martian_destination: | |
1912 | RT_CACHE_STAT_INC(in_martian_dst); | |
1913 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1914 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
1915 | printk(KERN_WARNING "martian destination %u.%u.%u.%u from " | |
1916 | "%u.%u.%u.%u, dev %s\n", | |
1917 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
1918 | #endif | |
2c2910a4 DE |
1919 | |
1920 | e_hostunreach: | |
e905a9ed YH |
1921 | err = -EHOSTUNREACH; |
1922 | goto done; | |
2c2910a4 | 1923 | |
1da177e4 LT |
1924 | e_inval: |
1925 | err = -EINVAL; | |
1926 | goto done; | |
1927 | ||
1928 | e_nobufs: | |
1929 | err = -ENOBUFS; | |
1930 | goto done; | |
1931 | ||
1932 | martian_source: | |
1933 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
1934 | goto e_inval; | |
1935 | } | |
1936 | ||
9e12bb22 | 1937 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1938 | u8 tos, struct net_device *dev) |
1939 | { | |
1940 | struct rtable * rth; | |
1941 | unsigned hash; | |
1942 | int iif = dev->ifindex; | |
1943 | ||
1944 | tos &= IPTOS_RT_MASK; | |
8c7bc840 | 1945 | hash = rt_hash(daddr, saddr, iif); |
1da177e4 LT |
1946 | |
1947 | rcu_read_lock(); | |
1948 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 1949 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
1950 | if (rth->fl.fl4_dst == daddr && |
1951 | rth->fl.fl4_src == saddr && | |
1952 | rth->fl.iif == iif && | |
1953 | rth->fl.oif == 0 && | |
47dcf0cb | 1954 | rth->fl.mark == skb->mark && |
1da177e4 LT |
1955 | rth->fl.fl4_tos == tos) { |
1956 | rth->u.dst.lastuse = jiffies; | |
1957 | dst_hold(&rth->u.dst); | |
1958 | rth->u.dst.__use++; | |
1959 | RT_CACHE_STAT_INC(in_hit); | |
1960 | rcu_read_unlock(); | |
1961 | skb->dst = (struct dst_entry*)rth; | |
1962 | return 0; | |
1963 | } | |
1964 | RT_CACHE_STAT_INC(in_hlist_search); | |
1965 | } | |
1966 | rcu_read_unlock(); | |
1967 | ||
1968 | /* Multicast recognition logic is moved from route cache to here. | |
1969 | The problem was that too many Ethernet cards have broken/missing | |
1970 | hardware multicast filters :-( As result the host on multicasting | |
1971 | network acquires a lot of useless route cache entries, sort of | |
1972 | SDR messages from all the world. Now we try to get rid of them. | |
1973 | Really, provided software IP multicast filter is organized | |
1974 | reasonably (at least, hashed), it does not result in a slowdown | |
1975 | comparing with route cache reject entries. | |
1976 | Note, that multicast routers are not affected, because | |
1977 | route cache entry is created eventually. | |
1978 | */ | |
1979 | if (MULTICAST(daddr)) { | |
1980 | struct in_device *in_dev; | |
1981 | ||
1982 | rcu_read_lock(); | |
e5ed6399 | 1983 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 1984 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 1985 | ip_hdr(skb)->protocol); |
1da177e4 LT |
1986 | if (our |
1987 | #ifdef CONFIG_IP_MROUTE | |
1988 | || (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev)) | |
1989 | #endif | |
1990 | ) { | |
1991 | rcu_read_unlock(); | |
1992 | return ip_route_input_mc(skb, daddr, saddr, | |
1993 | tos, dev, our); | |
1994 | } | |
1995 | } | |
1996 | rcu_read_unlock(); | |
1997 | return -EINVAL; | |
1998 | } | |
1999 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2000 | } | |
2001 | ||
2002 | static inline int __mkroute_output(struct rtable **result, | |
e905a9ed | 2003 | struct fib_result* res, |
1da177e4 | 2004 | const struct flowi *fl, |
e905a9ed YH |
2005 | const struct flowi *oldflp, |
2006 | struct net_device *dev_out, | |
2007 | unsigned flags) | |
1da177e4 LT |
2008 | { |
2009 | struct rtable *rth; | |
2010 | struct in_device *in_dev; | |
2011 | u32 tos = RT_FL_TOS(oldflp); | |
2012 | int err = 0; | |
2013 | ||
2014 | if (LOOPBACK(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) | |
2015 | return -EINVAL; | |
2016 | ||
e448515c | 2017 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 LT |
2018 | res->type = RTN_BROADCAST; |
2019 | else if (MULTICAST(fl->fl4_dst)) | |
2020 | res->type = RTN_MULTICAST; | |
2021 | else if (BADCLASS(fl->fl4_dst) || ZERONET(fl->fl4_dst)) | |
2022 | return -EINVAL; | |
2023 | ||
2024 | if (dev_out->flags & IFF_LOOPBACK) | |
2025 | flags |= RTCF_LOCAL; | |
2026 | ||
2027 | /* get work reference to inet device */ | |
2028 | in_dev = in_dev_get(dev_out); | |
2029 | if (!in_dev) | |
2030 | return -EINVAL; | |
2031 | ||
2032 | if (res->type == RTN_BROADCAST) { | |
2033 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2034 | if (res->fi) { | |
2035 | fib_info_put(res->fi); | |
2036 | res->fi = NULL; | |
2037 | } | |
2038 | } else if (res->type == RTN_MULTICAST) { | |
2039 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2040 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2041 | oldflp->proto)) |
2042 | flags &= ~RTCF_LOCAL; | |
2043 | /* If multicast route do not exist use | |
2044 | default one, but do not gateway in this case. | |
2045 | Yes, it is hack. | |
2046 | */ | |
2047 | if (res->fi && res->prefixlen < 4) { | |
2048 | fib_info_put(res->fi); | |
2049 | res->fi = NULL; | |
2050 | } | |
2051 | } | |
2052 | ||
2053 | ||
2054 | rth = dst_alloc(&ipv4_dst_ops); | |
2055 | if (!rth) { | |
2056 | err = -ENOBUFS; | |
2057 | goto cleanup; | |
e905a9ed | 2058 | } |
1da177e4 | 2059 | |
ce723d8e | 2060 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2061 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2062 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2063 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2064 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2065 | rth->u.dst.flags |= DST_NOPOLICY; |
2066 | ||
2067 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2068 | rth->fl.fl4_tos = tos; | |
2069 | rth->fl.fl4_src = oldflp->fl4_src; | |
2070 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2071 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2072 | rth->rt_dst = fl->fl4_dst; |
2073 | rth->rt_src = fl->fl4_src; | |
2074 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2075 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2076 | cache entry */ |
2077 | rth->u.dst.dev = dev_out; | |
2078 | dev_hold(dev_out); | |
2079 | rth->idev = in_dev_get(dev_out); | |
2080 | rth->rt_gateway = fl->fl4_dst; | |
2081 | rth->rt_spec_dst= fl->fl4_src; | |
2082 | ||
2083 | rth->u.dst.output=ip_output; | |
2084 | ||
2085 | RT_CACHE_STAT_INC(out_slow_tot); | |
2086 | ||
2087 | if (flags & RTCF_LOCAL) { | |
2088 | rth->u.dst.input = ip_local_deliver; | |
2089 | rth->rt_spec_dst = fl->fl4_dst; | |
2090 | } | |
2091 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2092 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2093 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2094 | !(dev_out->flags & IFF_LOOPBACK)) { |
2095 | rth->u.dst.output = ip_mc_output; | |
2096 | RT_CACHE_STAT_INC(out_slow_mc); | |
2097 | } | |
2098 | #ifdef CONFIG_IP_MROUTE | |
2099 | if (res->type == RTN_MULTICAST) { | |
2100 | if (IN_DEV_MFORWARD(in_dev) && | |
2101 | !LOCAL_MCAST(oldflp->fl4_dst)) { | |
2102 | rth->u.dst.input = ip_mr_input; | |
2103 | rth->u.dst.output = ip_mc_output; | |
2104 | } | |
2105 | } | |
2106 | #endif | |
2107 | } | |
2108 | ||
2109 | rt_set_nexthop(rth, res, 0); | |
2110 | ||
2111 | rth->rt_flags = flags; | |
2112 | ||
2113 | *result = rth; | |
2114 | cleanup: | |
2115 | /* release work reference to inet device */ | |
2116 | in_dev_put(in_dev); | |
2117 | ||
2118 | return err; | |
2119 | } | |
2120 | ||
e06e7c61 DM |
2121 | static inline int ip_mkroute_output(struct rtable **rp, |
2122 | struct fib_result* res, | |
2123 | const struct flowi *fl, | |
2124 | const struct flowi *oldflp, | |
2125 | struct net_device *dev_out, | |
2126 | unsigned flags) | |
1da177e4 | 2127 | { |
7abaa27c | 2128 | struct rtable *rth = NULL; |
1da177e4 LT |
2129 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2130 | unsigned hash; | |
2131 | if (err == 0) { | |
8c7bc840 | 2132 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif); |
1da177e4 LT |
2133 | err = rt_intern_hash(hash, rth, rp); |
2134 | } | |
e905a9ed | 2135 | |
1da177e4 LT |
2136 | return err; |
2137 | } | |
2138 | ||
1da177e4 LT |
2139 | /* |
2140 | * Major route resolver routine. | |
2141 | */ | |
2142 | ||
2143 | static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp) | |
2144 | { | |
2145 | u32 tos = RT_FL_TOS(oldflp); | |
2146 | struct flowi fl = { .nl_u = { .ip4_u = | |
2147 | { .daddr = oldflp->fl4_dst, | |
2148 | .saddr = oldflp->fl4_src, | |
2149 | .tos = tos & IPTOS_RT_MASK, | |
2150 | .scope = ((tos & RTO_ONLINK) ? | |
2151 | RT_SCOPE_LINK : | |
2152 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2153 | } }, |
47dcf0cb | 2154 | .mark = oldflp->mark, |
1da177e4 LT |
2155 | .iif = loopback_dev.ifindex, |
2156 | .oif = oldflp->oif }; | |
2157 | struct fib_result res; | |
2158 | unsigned flags = 0; | |
2159 | struct net_device *dev_out = NULL; | |
2160 | int free_res = 0; | |
2161 | int err; | |
2162 | ||
2163 | ||
2164 | res.fi = NULL; | |
2165 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2166 | res.r = NULL; | |
2167 | #endif | |
2168 | ||
2169 | if (oldflp->fl4_src) { | |
2170 | err = -EINVAL; | |
2171 | if (MULTICAST(oldflp->fl4_src) || | |
2172 | BADCLASS(oldflp->fl4_src) || | |
2173 | ZERONET(oldflp->fl4_src)) | |
2174 | goto out; | |
2175 | ||
2176 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
2177 | dev_out = ip_dev_find(oldflp->fl4_src); | |
f6c5d736 | 2178 | if (dev_out == NULL) |
1da177e4 LT |
2179 | goto out; |
2180 | ||
2181 | /* I removed check for oif == dev_out->oif here. | |
2182 | It was wrong for two reasons: | |
2183 | 1. ip_dev_find(saddr) can return wrong iface, if saddr is | |
2184 | assigned to multiple interfaces. | |
2185 | 2. Moreover, we are allowed to send packets with saddr | |
2186 | of another iface. --ANK | |
2187 | */ | |
2188 | ||
f6c5d736 | 2189 | if (oldflp->oif == 0 |
e448515c | 2190 | && (MULTICAST(oldflp->fl4_dst) || oldflp->fl4_dst == htonl(0xFFFFFFFF))) { |
1da177e4 LT |
2191 | /* Special hack: user can direct multicasts |
2192 | and limited broadcast via necessary interface | |
2193 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2194 | This hack is not just for fun, it allows | |
2195 | vic,vat and friends to work. | |
2196 | They bind socket to loopback, set ttl to zero | |
2197 | and expect that it will work. | |
2198 | From the viewpoint of routing cache they are broken, | |
2199 | because we are not allowed to build multicast path | |
2200 | with loopback source addr (look, routing cache | |
2201 | cannot know, that ttl is zero, so that packet | |
2202 | will not leave this host and route is valid). | |
2203 | Luckily, this hack is good workaround. | |
2204 | */ | |
2205 | ||
2206 | fl.oif = dev_out->ifindex; | |
2207 | goto make_route; | |
2208 | } | |
2209 | if (dev_out) | |
2210 | dev_put(dev_out); | |
2211 | dev_out = NULL; | |
2212 | } | |
2213 | ||
2214 | ||
2215 | if (oldflp->oif) { | |
2216 | dev_out = dev_get_by_index(oldflp->oif); | |
2217 | err = -ENODEV; | |
2218 | if (dev_out == NULL) | |
2219 | goto out; | |
e5ed6399 HX |
2220 | |
2221 | /* RACE: Check return value of inet_select_addr instead. */ | |
2222 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2223 | dev_put(dev_out); |
2224 | goto out; /* Wrong error code */ | |
2225 | } | |
2226 | ||
e448515c | 2227 | if (LOCAL_MCAST(oldflp->fl4_dst) || oldflp->fl4_dst == htonl(0xFFFFFFFF)) { |
1da177e4 LT |
2228 | if (!fl.fl4_src) |
2229 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2230 | RT_SCOPE_LINK); | |
2231 | goto make_route; | |
2232 | } | |
2233 | if (!fl.fl4_src) { | |
2234 | if (MULTICAST(oldflp->fl4_dst)) | |
2235 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2236 | fl.fl4_scope); | |
2237 | else if (!oldflp->fl4_dst) | |
2238 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2239 | RT_SCOPE_HOST); | |
2240 | } | |
2241 | } | |
2242 | ||
2243 | if (!fl.fl4_dst) { | |
2244 | fl.fl4_dst = fl.fl4_src; | |
2245 | if (!fl.fl4_dst) | |
2246 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2247 | if (dev_out) | |
2248 | dev_put(dev_out); | |
2249 | dev_out = &loopback_dev; | |
2250 | dev_hold(dev_out); | |
2251 | fl.oif = loopback_dev.ifindex; | |
2252 | res.type = RTN_LOCAL; | |
2253 | flags |= RTCF_LOCAL; | |
2254 | goto make_route; | |
2255 | } | |
2256 | ||
2257 | if (fib_lookup(&fl, &res)) { | |
2258 | res.fi = NULL; | |
2259 | if (oldflp->oif) { | |
2260 | /* Apparently, routing tables are wrong. Assume, | |
2261 | that the destination is on link. | |
2262 | ||
2263 | WHY? DW. | |
2264 | Because we are allowed to send to iface | |
2265 | even if it has NO routes and NO assigned | |
2266 | addresses. When oif is specified, routing | |
2267 | tables are looked up with only one purpose: | |
2268 | to catch if destination is gatewayed, rather than | |
2269 | direct. Moreover, if MSG_DONTROUTE is set, | |
2270 | we send packet, ignoring both routing tables | |
2271 | and ifaddr state. --ANK | |
2272 | ||
2273 | ||
2274 | We could make it even if oif is unknown, | |
2275 | likely IPv6, but we do not. | |
2276 | */ | |
2277 | ||
2278 | if (fl.fl4_src == 0) | |
2279 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2280 | RT_SCOPE_LINK); | |
2281 | res.type = RTN_UNICAST; | |
2282 | goto make_route; | |
2283 | } | |
2284 | if (dev_out) | |
2285 | dev_put(dev_out); | |
2286 | err = -ENETUNREACH; | |
2287 | goto out; | |
2288 | } | |
2289 | free_res = 1; | |
2290 | ||
2291 | if (res.type == RTN_LOCAL) { | |
2292 | if (!fl.fl4_src) | |
2293 | fl.fl4_src = fl.fl4_dst; | |
2294 | if (dev_out) | |
2295 | dev_put(dev_out); | |
2296 | dev_out = &loopback_dev; | |
2297 | dev_hold(dev_out); | |
2298 | fl.oif = dev_out->ifindex; | |
2299 | if (res.fi) | |
2300 | fib_info_put(res.fi); | |
2301 | res.fi = NULL; | |
2302 | flags |= RTCF_LOCAL; | |
2303 | goto make_route; | |
2304 | } | |
2305 | ||
2306 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2307 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2308 | fib_select_multipath(&fl, &res); | |
2309 | else | |
2310 | #endif | |
2311 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
2312 | fib_select_default(&fl, &res); | |
2313 | ||
2314 | if (!fl.fl4_src) | |
2315 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2316 | ||
2317 | if (dev_out) | |
2318 | dev_put(dev_out); | |
2319 | dev_out = FIB_RES_DEV(res); | |
2320 | dev_hold(dev_out); | |
2321 | fl.oif = dev_out->ifindex; | |
2322 | ||
2323 | ||
2324 | make_route: | |
2325 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2326 | ||
2327 | ||
2328 | if (free_res) | |
2329 | fib_res_put(&res); | |
2330 | if (dev_out) | |
2331 | dev_put(dev_out); | |
2332 | out: return err; | |
2333 | } | |
2334 | ||
2335 | int __ip_route_output_key(struct rtable **rp, const struct flowi *flp) | |
2336 | { | |
2337 | unsigned hash; | |
2338 | struct rtable *rth; | |
2339 | ||
8c7bc840 | 2340 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif); |
1da177e4 LT |
2341 | |
2342 | rcu_read_lock_bh(); | |
2343 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2344 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2345 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2346 | rth->fl.fl4_src == flp->fl4_src && | |
2347 | rth->fl.iif == 0 && | |
2348 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2349 | rth->fl.mark == flp->mark && |
1da177e4 LT |
2350 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
2351 | (IPTOS_RT_MASK | RTO_ONLINK))) { | |
1da177e4 LT |
2352 | rth->u.dst.lastuse = jiffies; |
2353 | dst_hold(&rth->u.dst); | |
2354 | rth->u.dst.__use++; | |
2355 | RT_CACHE_STAT_INC(out_hit); | |
2356 | rcu_read_unlock_bh(); | |
2357 | *rp = rth; | |
2358 | return 0; | |
2359 | } | |
2360 | RT_CACHE_STAT_INC(out_hlist_search); | |
2361 | } | |
2362 | rcu_read_unlock_bh(); | |
2363 | ||
2364 | return ip_route_output_slow(rp, flp); | |
2365 | } | |
2366 | ||
d8c97a94 ACM |
2367 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2368 | ||
14e50e57 DM |
2369 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2370 | { | |
2371 | } | |
2372 | ||
2373 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2374 | .family = AF_INET, | |
2375 | .protocol = __constant_htons(ETH_P_IP), | |
2376 | .destroy = ipv4_dst_destroy, | |
2377 | .check = ipv4_dst_check, | |
2378 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
2379 | .entry_size = sizeof(struct rtable), | |
2380 | }; | |
2381 | ||
2382 | ||
2383 | static int ipv4_blackhole_output(struct sk_buff *skb) | |
2384 | { | |
2385 | kfree_skb(skb); | |
2386 | return 0; | |
2387 | } | |
2388 | ||
2389 | static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp, struct sock *sk) | |
2390 | { | |
2391 | struct rtable *ort = *rp; | |
2392 | struct rtable *rt = (struct rtable *) | |
2393 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2394 | ||
2395 | if (rt) { | |
2396 | struct dst_entry *new = &rt->u.dst; | |
2397 | ||
2398 | atomic_set(&new->__refcnt, 1); | |
2399 | new->__use = 1; | |
2400 | new->input = ipv4_blackhole_output; | |
2401 | new->output = ipv4_blackhole_output; | |
2402 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
2403 | ||
2404 | new->dev = ort->u.dst.dev; | |
2405 | if (new->dev) | |
2406 | dev_hold(new->dev); | |
2407 | ||
2408 | rt->fl = ort->fl; | |
2409 | ||
2410 | rt->idev = ort->idev; | |
2411 | if (rt->idev) | |
2412 | in_dev_hold(rt->idev); | |
2413 | rt->rt_flags = ort->rt_flags; | |
2414 | rt->rt_type = ort->rt_type; | |
2415 | rt->rt_dst = ort->rt_dst; | |
2416 | rt->rt_src = ort->rt_src; | |
2417 | rt->rt_iif = ort->rt_iif; | |
2418 | rt->rt_gateway = ort->rt_gateway; | |
2419 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2420 | rt->peer = ort->peer; | |
2421 | if (rt->peer) | |
2422 | atomic_inc(&rt->peer->refcnt); | |
2423 | ||
2424 | dst_free(new); | |
2425 | } | |
2426 | ||
2427 | dst_release(&(*rp)->u.dst); | |
2428 | *rp = rt; | |
2429 | return (rt ? 0 : -ENOMEM); | |
2430 | } | |
2431 | ||
1da177e4 LT |
2432 | int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags) |
2433 | { | |
2434 | int err; | |
2435 | ||
2436 | if ((err = __ip_route_output_key(rp, flp)) != 0) | |
2437 | return err; | |
2438 | ||
2439 | if (flp->proto) { | |
2440 | if (!flp->fl4_src) | |
2441 | flp->fl4_src = (*rp)->rt_src; | |
2442 | if (!flp->fl4_dst) | |
2443 | flp->fl4_dst = (*rp)->rt_dst; | |
14e50e57 DM |
2444 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, flags); |
2445 | if (err == -EREMOTE) | |
2446 | err = ipv4_dst_blackhole(rp, flp, sk); | |
2447 | ||
2448 | return err; | |
1da177e4 LT |
2449 | } |
2450 | ||
2451 | return 0; | |
2452 | } | |
2453 | ||
d8c97a94 ACM |
2454 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2455 | ||
1da177e4 LT |
2456 | int ip_route_output_key(struct rtable **rp, struct flowi *flp) |
2457 | { | |
2458 | return ip_route_output_flow(rp, flp, NULL, 0); | |
2459 | } | |
2460 | ||
2461 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2462 | int nowait, unsigned int flags) |
1da177e4 LT |
2463 | { |
2464 | struct rtable *rt = (struct rtable*)skb->dst; | |
2465 | struct rtmsg *r; | |
be403ea1 | 2466 | struct nlmsghdr *nlh; |
e3703b3d TG |
2467 | long expires; |
2468 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2469 | |
2470 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2471 | if (nlh == NULL) | |
26932566 | 2472 | return -EMSGSIZE; |
be403ea1 TG |
2473 | |
2474 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2475 | r->rtm_family = AF_INET; |
2476 | r->rtm_dst_len = 32; | |
2477 | r->rtm_src_len = 0; | |
2478 | r->rtm_tos = rt->fl.fl4_tos; | |
2479 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2480 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2481 | r->rtm_type = rt->rt_type; |
2482 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2483 | r->rtm_protocol = RTPROT_UNSPEC; | |
2484 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2485 | if (rt->rt_flags & RTCF_NOTIFY) | |
2486 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2487 | |
17fb2c64 | 2488 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2489 | |
1da177e4 LT |
2490 | if (rt->fl.fl4_src) { |
2491 | r->rtm_src_len = 32; | |
17fb2c64 | 2492 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2493 | } |
2494 | if (rt->u.dst.dev) | |
be403ea1 | 2495 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2496 | #ifdef CONFIG_NET_CLS_ROUTE |
2497 | if (rt->u.dst.tclassid) | |
be403ea1 | 2498 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2499 | #endif |
2500 | if (rt->fl.iif) | |
17fb2c64 | 2501 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2502 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2503 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2504 | |
1da177e4 | 2505 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2506 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2507 | |
1da177e4 | 2508 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2509 | goto nla_put_failure; |
2510 | ||
e3703b3d TG |
2511 | error = rt->u.dst.error; |
2512 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2513 | if (rt->peer) { |
e3703b3d | 2514 | id = rt->peer->ip_id_count; |
1da177e4 | 2515 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2516 | ts = rt->peer->tcp_ts; |
9d729f72 | 2517 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2518 | } |
2519 | } | |
be403ea1 | 2520 | |
1da177e4 LT |
2521 | if (rt->fl.iif) { |
2522 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2523 | __be32 dst = rt->rt_dst; |
1da177e4 LT |
2524 | |
2525 | if (MULTICAST(dst) && !LOCAL_MCAST(dst) && | |
42f811b8 | 2526 | IPV4_DEVCONF_ALL(MC_FORWARDING)) { |
1da177e4 LT |
2527 | int err = ipmr_get_route(skb, r, nowait); |
2528 | if (err <= 0) { | |
2529 | if (!nowait) { | |
2530 | if (err == 0) | |
2531 | return 0; | |
be403ea1 | 2532 | goto nla_put_failure; |
1da177e4 LT |
2533 | } else { |
2534 | if (err == -EMSGSIZE) | |
be403ea1 | 2535 | goto nla_put_failure; |
e3703b3d | 2536 | error = err; |
1da177e4 LT |
2537 | } |
2538 | } | |
2539 | } else | |
2540 | #endif | |
be403ea1 | 2541 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2542 | } |
2543 | ||
e3703b3d TG |
2544 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2545 | expires, error) < 0) | |
2546 | goto nla_put_failure; | |
be403ea1 TG |
2547 | |
2548 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2549 | |
be403ea1 | 2550 | nla_put_failure: |
26932566 PM |
2551 | nlmsg_cancel(skb, nlh); |
2552 | return -EMSGSIZE; | |
1da177e4 LT |
2553 | } |
2554 | ||
63f3444f | 2555 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2556 | { |
d889ce3b TG |
2557 | struct rtmsg *rtm; |
2558 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2559 | struct rtable *rt = NULL; |
9e12bb22 AV |
2560 | __be32 dst = 0; |
2561 | __be32 src = 0; | |
2562 | u32 iif; | |
d889ce3b | 2563 | int err; |
1da177e4 LT |
2564 | struct sk_buff *skb; |
2565 | ||
d889ce3b TG |
2566 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2567 | if (err < 0) | |
2568 | goto errout; | |
2569 | ||
2570 | rtm = nlmsg_data(nlh); | |
2571 | ||
1da177e4 | 2572 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2573 | if (skb == NULL) { |
2574 | err = -ENOBUFS; | |
2575 | goto errout; | |
2576 | } | |
1da177e4 LT |
2577 | |
2578 | /* Reserve room for dummy headers, this skb can pass | |
2579 | through good chunk of routing engine. | |
2580 | */ | |
459a98ed | 2581 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2582 | skb_reset_network_header(skb); |
d2c962b8 SH |
2583 | |
2584 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2585 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2586 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2587 | ||
17fb2c64 AV |
2588 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2589 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2590 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2591 | |
2592 | if (iif) { | |
d889ce3b TG |
2593 | struct net_device *dev; |
2594 | ||
2595 | dev = __dev_get_by_index(iif); | |
2596 | if (dev == NULL) { | |
2597 | err = -ENODEV; | |
2598 | goto errout_free; | |
2599 | } | |
2600 | ||
1da177e4 LT |
2601 | skb->protocol = htons(ETH_P_IP); |
2602 | skb->dev = dev; | |
2603 | local_bh_disable(); | |
2604 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2605 | local_bh_enable(); | |
d889ce3b TG |
2606 | |
2607 | rt = (struct rtable*) skb->dst; | |
2608 | if (err == 0 && rt->u.dst.error) | |
1da177e4 LT |
2609 | err = -rt->u.dst.error; |
2610 | } else { | |
d889ce3b TG |
2611 | struct flowi fl = { |
2612 | .nl_u = { | |
2613 | .ip4_u = { | |
2614 | .daddr = dst, | |
2615 | .saddr = src, | |
2616 | .tos = rtm->rtm_tos, | |
2617 | }, | |
2618 | }, | |
2619 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2620 | }; | |
1da177e4 LT |
2621 | err = ip_route_output_key(&rt, &fl); |
2622 | } | |
d889ce3b | 2623 | |
1da177e4 | 2624 | if (err) |
d889ce3b | 2625 | goto errout_free; |
1da177e4 LT |
2626 | |
2627 | skb->dst = &rt->u.dst; | |
2628 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
2629 | rt->rt_flags |= RTCF_NOTIFY; | |
2630 | ||
1da177e4 | 2631 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
b6544c0b | 2632 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2633 | if (err <= 0) |
2634 | goto errout_free; | |
1da177e4 | 2635 | |
2942e900 | 2636 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
d889ce3b | 2637 | errout: |
2942e900 | 2638 | return err; |
1da177e4 | 2639 | |
d889ce3b | 2640 | errout_free: |
1da177e4 | 2641 | kfree_skb(skb); |
d889ce3b | 2642 | goto errout; |
1da177e4 LT |
2643 | } |
2644 | ||
2645 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2646 | { | |
2647 | struct rtable *rt; | |
2648 | int h, s_h; | |
2649 | int idx, s_idx; | |
2650 | ||
2651 | s_h = cb->args[0]; | |
2652 | s_idx = idx = cb->args[1]; | |
2653 | for (h = 0; h <= rt_hash_mask; h++) { | |
2654 | if (h < s_h) continue; | |
2655 | if (h > s_h) | |
2656 | s_idx = 0; | |
2657 | rcu_read_lock_bh(); | |
2658 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2659 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
1da177e4 LT |
2660 | if (idx < s_idx) |
2661 | continue; | |
2662 | skb->dst = dst_clone(&rt->u.dst); | |
2663 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 2664 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2665 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
2666 | dst_release(xchg(&skb->dst, NULL)); |
2667 | rcu_read_unlock_bh(); | |
2668 | goto done; | |
2669 | } | |
2670 | dst_release(xchg(&skb->dst, NULL)); | |
2671 | } | |
2672 | rcu_read_unlock_bh(); | |
2673 | } | |
2674 | ||
2675 | done: | |
2676 | cb->args[0] = h; | |
2677 | cb->args[1] = idx; | |
2678 | return skb->len; | |
2679 | } | |
2680 | ||
2681 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2682 | { | |
2683 | rt_cache_flush(0); | |
2684 | } | |
2685 | ||
2686 | #ifdef CONFIG_SYSCTL | |
2687 | static int flush_delay; | |
2688 | ||
2689 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, | |
2690 | struct file *filp, void __user *buffer, | |
2691 | size_t *lenp, loff_t *ppos) | |
2692 | { | |
2693 | if (write) { | |
2694 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2695 | rt_cache_flush(flush_delay); | |
2696 | return 0; | |
e905a9ed | 2697 | } |
1da177e4 LT |
2698 | |
2699 | return -EINVAL; | |
2700 | } | |
2701 | ||
2702 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
2703 | int __user *name, | |
2704 | int nlen, | |
2705 | void __user *oldval, | |
2706 | size_t __user *oldlenp, | |
2707 | void __user *newval, | |
1f29bcd7 | 2708 | size_t newlen) |
1da177e4 LT |
2709 | { |
2710 | int delay; | |
2711 | if (newlen != sizeof(int)) | |
2712 | return -EINVAL; | |
2713 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed YH |
2714 | return -EFAULT; |
2715 | rt_cache_flush(delay); | |
1da177e4 LT |
2716 | return 0; |
2717 | } | |
2718 | ||
2719 | ctl_table ipv4_route_table[] = { | |
e905a9ed | 2720 | { |
1da177e4 LT |
2721 | .ctl_name = NET_IPV4_ROUTE_FLUSH, |
2722 | .procname = "flush", | |
2723 | .data = &flush_delay, | |
2724 | .maxlen = sizeof(int), | |
7e3e0360 | 2725 | .mode = 0200, |
1da177e4 LT |
2726 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
2727 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
2728 | }, | |
2729 | { | |
2730 | .ctl_name = NET_IPV4_ROUTE_MIN_DELAY, | |
2731 | .procname = "min_delay", | |
2732 | .data = &ip_rt_min_delay, | |
2733 | .maxlen = sizeof(int), | |
2734 | .mode = 0644, | |
2735 | .proc_handler = &proc_dointvec_jiffies, | |
2736 | .strategy = &sysctl_jiffies, | |
2737 | }, | |
2738 | { | |
2739 | .ctl_name = NET_IPV4_ROUTE_MAX_DELAY, | |
2740 | .procname = "max_delay", | |
2741 | .data = &ip_rt_max_delay, | |
2742 | .maxlen = sizeof(int), | |
2743 | .mode = 0644, | |
2744 | .proc_handler = &proc_dointvec_jiffies, | |
2745 | .strategy = &sysctl_jiffies, | |
2746 | }, | |
2747 | { | |
2748 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
2749 | .procname = "gc_thresh", | |
2750 | .data = &ipv4_dst_ops.gc_thresh, | |
2751 | .maxlen = sizeof(int), | |
2752 | .mode = 0644, | |
2753 | .proc_handler = &proc_dointvec, | |
2754 | }, | |
2755 | { | |
2756 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
2757 | .procname = "max_size", | |
2758 | .data = &ip_rt_max_size, | |
2759 | .maxlen = sizeof(int), | |
2760 | .mode = 0644, | |
2761 | .proc_handler = &proc_dointvec, | |
2762 | }, | |
2763 | { | |
2764 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2765 | |
1da177e4 LT |
2766 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
2767 | .procname = "gc_min_interval", | |
2768 | .data = &ip_rt_gc_min_interval, | |
2769 | .maxlen = sizeof(int), | |
2770 | .mode = 0644, | |
2771 | .proc_handler = &proc_dointvec_jiffies, | |
2772 | .strategy = &sysctl_jiffies, | |
2773 | }, | |
2774 | { | |
2775 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
2776 | .procname = "gc_min_interval_ms", | |
2777 | .data = &ip_rt_gc_min_interval, | |
2778 | .maxlen = sizeof(int), | |
2779 | .mode = 0644, | |
2780 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2781 | .strategy = &sysctl_ms_jiffies, | |
2782 | }, | |
2783 | { | |
2784 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
2785 | .procname = "gc_timeout", | |
2786 | .data = &ip_rt_gc_timeout, | |
2787 | .maxlen = sizeof(int), | |
2788 | .mode = 0644, | |
2789 | .proc_handler = &proc_dointvec_jiffies, | |
2790 | .strategy = &sysctl_jiffies, | |
2791 | }, | |
2792 | { | |
2793 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
2794 | .procname = "gc_interval", | |
2795 | .data = &ip_rt_gc_interval, | |
2796 | .maxlen = sizeof(int), | |
2797 | .mode = 0644, | |
2798 | .proc_handler = &proc_dointvec_jiffies, | |
2799 | .strategy = &sysctl_jiffies, | |
2800 | }, | |
2801 | { | |
2802 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
2803 | .procname = "redirect_load", | |
2804 | .data = &ip_rt_redirect_load, | |
2805 | .maxlen = sizeof(int), | |
2806 | .mode = 0644, | |
2807 | .proc_handler = &proc_dointvec, | |
2808 | }, | |
2809 | { | |
2810 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
2811 | .procname = "redirect_number", | |
2812 | .data = &ip_rt_redirect_number, | |
2813 | .maxlen = sizeof(int), | |
2814 | .mode = 0644, | |
2815 | .proc_handler = &proc_dointvec, | |
2816 | }, | |
2817 | { | |
2818 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
2819 | .procname = "redirect_silence", | |
2820 | .data = &ip_rt_redirect_silence, | |
2821 | .maxlen = sizeof(int), | |
2822 | .mode = 0644, | |
2823 | .proc_handler = &proc_dointvec, | |
2824 | }, | |
2825 | { | |
2826 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
2827 | .procname = "error_cost", | |
2828 | .data = &ip_rt_error_cost, | |
2829 | .maxlen = sizeof(int), | |
2830 | .mode = 0644, | |
2831 | .proc_handler = &proc_dointvec, | |
2832 | }, | |
2833 | { | |
2834 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
2835 | .procname = "error_burst", | |
2836 | .data = &ip_rt_error_burst, | |
2837 | .maxlen = sizeof(int), | |
2838 | .mode = 0644, | |
2839 | .proc_handler = &proc_dointvec, | |
2840 | }, | |
2841 | { | |
2842 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
2843 | .procname = "gc_elasticity", | |
2844 | .data = &ip_rt_gc_elasticity, | |
2845 | .maxlen = sizeof(int), | |
2846 | .mode = 0644, | |
2847 | .proc_handler = &proc_dointvec, | |
2848 | }, | |
2849 | { | |
2850 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
2851 | .procname = "mtu_expires", | |
2852 | .data = &ip_rt_mtu_expires, | |
2853 | .maxlen = sizeof(int), | |
2854 | .mode = 0644, | |
2855 | .proc_handler = &proc_dointvec_jiffies, | |
2856 | .strategy = &sysctl_jiffies, | |
2857 | }, | |
2858 | { | |
2859 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
2860 | .procname = "min_pmtu", | |
2861 | .data = &ip_rt_min_pmtu, | |
2862 | .maxlen = sizeof(int), | |
2863 | .mode = 0644, | |
2864 | .proc_handler = &proc_dointvec, | |
2865 | }, | |
2866 | { | |
2867 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
2868 | .procname = "min_adv_mss", | |
2869 | .data = &ip_rt_min_advmss, | |
2870 | .maxlen = sizeof(int), | |
2871 | .mode = 0644, | |
2872 | .proc_handler = &proc_dointvec, | |
2873 | }, | |
2874 | { | |
2875 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
2876 | .procname = "secret_interval", | |
2877 | .data = &ip_rt_secret_interval, | |
2878 | .maxlen = sizeof(int), | |
2879 | .mode = 0644, | |
2880 | .proc_handler = &proc_dointvec_jiffies, | |
2881 | .strategy = &sysctl_jiffies, | |
2882 | }, | |
2883 | { .ctl_name = 0 } | |
2884 | }; | |
2885 | #endif | |
2886 | ||
2887 | #ifdef CONFIG_NET_CLS_ROUTE | |
2888 | struct ip_rt_acct *ip_rt_acct; | |
2889 | ||
2890 | /* This code sucks. But you should have seen it before! --RR */ | |
2891 | ||
2892 | /* IP route accounting ptr for this logical cpu number. */ | |
2893 | #define IP_RT_ACCT_CPU(i) (ip_rt_acct + i * 256) | |
2894 | ||
2895 | #ifdef CONFIG_PROC_FS | |
2896 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
2897 | int length, int *eof, void *data) | |
2898 | { | |
2899 | unsigned int i; | |
2900 | ||
2901 | if ((offset & 3) || (length & 3)) | |
2902 | return -EIO; | |
2903 | ||
2904 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
2905 | *eof = 1; | |
2906 | return 0; | |
2907 | } | |
2908 | ||
2909 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
2910 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
2911 | *eof = 1; | |
2912 | } | |
2913 | ||
2914 | offset /= sizeof(u32); | |
2915 | ||
2916 | if (length > 0) { | |
2917 | u32 *src = ((u32 *) IP_RT_ACCT_CPU(0)) + offset; | |
2918 | u32 *dst = (u32 *) buffer; | |
2919 | ||
2920 | /* Copy first cpu. */ | |
2921 | *start = buffer; | |
2922 | memcpy(dst, src, length); | |
2923 | ||
2924 | /* Add the other cpus in, one int at a time */ | |
6f912042 | 2925 | for_each_possible_cpu(i) { |
1da177e4 LT |
2926 | unsigned int j; |
2927 | ||
2928 | src = ((u32 *) IP_RT_ACCT_CPU(i)) + offset; | |
2929 | ||
2930 | for (j = 0; j < length/4; j++) | |
2931 | dst[j] += src[j]; | |
2932 | } | |
2933 | } | |
2934 | return length; | |
2935 | } | |
2936 | #endif /* CONFIG_PROC_FS */ | |
2937 | #endif /* CONFIG_NET_CLS_ROUTE */ | |
2938 | ||
2939 | static __initdata unsigned long rhash_entries; | |
2940 | static int __init set_rhash_entries(char *str) | |
2941 | { | |
2942 | if (!str) | |
2943 | return 0; | |
2944 | rhash_entries = simple_strtoul(str, &str, 0); | |
2945 | return 1; | |
2946 | } | |
2947 | __setup("rhash_entries=", set_rhash_entries); | |
2948 | ||
2949 | int __init ip_rt_init(void) | |
2950 | { | |
424c4b70 | 2951 | int rc = 0; |
1da177e4 LT |
2952 | |
2953 | rt_hash_rnd = (int) ((num_physpages ^ (num_physpages>>8)) ^ | |
2954 | (jiffies ^ (jiffies >> 7))); | |
2955 | ||
2956 | #ifdef CONFIG_NET_CLS_ROUTE | |
424c4b70 ED |
2957 | { |
2958 | int order; | |
1da177e4 LT |
2959 | for (order = 0; |
2960 | (PAGE_SIZE << order) < 256 * sizeof(struct ip_rt_acct) * NR_CPUS; order++) | |
2961 | /* NOTHING */; | |
2962 | ip_rt_acct = (struct ip_rt_acct *)__get_free_pages(GFP_KERNEL, order); | |
2963 | if (!ip_rt_acct) | |
2964 | panic("IP: failed to allocate ip_rt_acct\n"); | |
2965 | memset(ip_rt_acct, 0, PAGE_SIZE << order); | |
424c4b70 | 2966 | } |
1da177e4 LT |
2967 | #endif |
2968 | ||
e5d679f3 AD |
2969 | ipv4_dst_ops.kmem_cachep = |
2970 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 2971 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 2972 | |
14e50e57 DM |
2973 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
2974 | ||
424c4b70 ED |
2975 | rt_hash_table = (struct rt_hash_bucket *) |
2976 | alloc_large_system_hash("IP route cache", | |
2977 | sizeof(struct rt_hash_bucket), | |
2978 | rhash_entries, | |
2979 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 2980 | 15 : 17, |
8d1502de | 2981 | 0, |
424c4b70 ED |
2982 | &rt_hash_log, |
2983 | &rt_hash_mask, | |
2984 | 0); | |
22c047cc ED |
2985 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
2986 | rt_hash_lock_init(); | |
1da177e4 LT |
2987 | |
2988 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
2989 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
2990 | ||
1da177e4 LT |
2991 | devinet_init(); |
2992 | ip_fib_init(); | |
2993 | ||
2994 | init_timer(&rt_flush_timer); | |
2995 | rt_flush_timer.function = rt_run_flush; | |
2996 | init_timer(&rt_periodic_timer); | |
2997 | rt_periodic_timer.function = rt_check_expire; | |
2998 | init_timer(&rt_secret_timer); | |
2999 | rt_secret_timer.function = rt_secret_rebuild; | |
3000 | ||
3001 | /* All the timers, started at system startup tend | |
3002 | to synchronize. Perturb it a bit. | |
3003 | */ | |
3004 | rt_periodic_timer.expires = jiffies + net_random() % ip_rt_gc_interval + | |
3005 | ip_rt_gc_interval; | |
3006 | add_timer(&rt_periodic_timer); | |
3007 | ||
3008 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + | |
3009 | ip_rt_secret_interval; | |
3010 | add_timer(&rt_secret_timer); | |
3011 | ||
3012 | #ifdef CONFIG_PROC_FS | |
3013 | { | |
3014 | struct proc_dir_entry *rtstat_pde = NULL; /* keep gcc happy */ | |
457c4cbc | 3015 | if (!proc_net_fops_create(&init_net, "rt_cache", S_IRUGO, &rt_cache_seq_fops) || |
e905a9ed | 3016 | !(rtstat_pde = create_proc_entry("rt_cache", S_IRUGO, |
457c4cbc | 3017 | init_net.proc_net_stat))) { |
1da177e4 LT |
3018 | return -ENOMEM; |
3019 | } | |
3020 | rtstat_pde->proc_fops = &rt_cpu_seq_fops; | |
3021 | } | |
3022 | #ifdef CONFIG_NET_CLS_ROUTE | |
457c4cbc | 3023 | create_proc_read_entry("rt_acct", 0, init_net.proc_net, ip_rt_acct_read, NULL); |
1da177e4 LT |
3024 | #endif |
3025 | #endif | |
3026 | #ifdef CONFIG_XFRM | |
3027 | xfrm_init(); | |
3028 | xfrm4_init(); | |
3029 | #endif | |
63f3444f TG |
3030 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3031 | ||
1da177e4 LT |
3032 | return rc; |
3033 | } | |
3034 | ||
3035 | EXPORT_SYMBOL(__ip_select_ident); | |
3036 | EXPORT_SYMBOL(ip_route_input); | |
3037 | EXPORT_SYMBOL(ip_route_output_key); |