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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * ROUTE - implementation of the IP router. | |
7 | * | |
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> | |
39c90ece | 84 | #include <linux/workqueue.h> |
1da177e4 | 85 | #include <linux/skbuff.h> |
1da177e4 LT |
86 | #include <linux/inetdevice.h> |
87 | #include <linux/igmp.h> | |
88 | #include <linux/pkt_sched.h> | |
89 | #include <linux/mroute.h> | |
90 | #include <linux/netfilter_ipv4.h> | |
91 | #include <linux/random.h> | |
92 | #include <linux/jhash.h> | |
93 | #include <linux/rcupdate.h> | |
94 | #include <linux/times.h> | |
352e512c | 95 | #include <net/dst.h> |
457c4cbc | 96 | #include <net/net_namespace.h> |
1da177e4 LT |
97 | #include <net/protocol.h> |
98 | #include <net/ip.h> | |
99 | #include <net/route.h> | |
100 | #include <net/inetpeer.h> | |
101 | #include <net/sock.h> | |
102 | #include <net/ip_fib.h> | |
103 | #include <net/arp.h> | |
104 | #include <net/tcp.h> | |
105 | #include <net/icmp.h> | |
106 | #include <net/xfrm.h> | |
8d71740c | 107 | #include <net/netevent.h> |
63f3444f | 108 | #include <net/rtnetlink.h> |
1da177e4 LT |
109 | #ifdef CONFIG_SYSCTL |
110 | #include <linux/sysctl.h> | |
111 | #endif | |
112 | ||
113 | #define RT_FL_TOS(oldflp) \ | |
114 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) | |
115 | ||
116 | #define IP_MAX_MTU 0xFFF0 | |
117 | ||
118 | #define RT_GC_TIMEOUT (300*HZ) | |
119 | ||
1da177e4 LT |
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; | |
1da177e4 LT |
134 | |
135 | #define RTprint(a...) printk(KERN_DEBUG a) | |
136 | ||
beb659bd ED |
137 | static void rt_worker_func(struct work_struct *work); |
138 | static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); | |
1da177e4 LT |
139 | static struct timer_list rt_secret_timer; |
140 | ||
141 | /* | |
142 | * Interface to generic destination cache. | |
143 | */ | |
144 | ||
145 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
146 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
147 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
148 | struct net_device *dev, int how); | |
149 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
150 | static void ipv4_link_failure(struct sk_buff *skb); | |
151 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
569d3645 | 152 | static int rt_garbage_collect(struct dst_ops *ops); |
1da177e4 LT |
153 | |
154 | ||
155 | static struct dst_ops ipv4_dst_ops = { | |
156 | .family = AF_INET, | |
157 | .protocol = __constant_htons(ETH_P_IP), | |
158 | .gc = rt_garbage_collect, | |
159 | .check = ipv4_dst_check, | |
160 | .destroy = ipv4_dst_destroy, | |
161 | .ifdown = ipv4_dst_ifdown, | |
162 | .negative_advice = ipv4_negative_advice, | |
163 | .link_failure = ipv4_link_failure, | |
164 | .update_pmtu = ip_rt_update_pmtu, | |
862b82c6 | 165 | .local_out = ip_local_out, |
1da177e4 | 166 | .entry_size = sizeof(struct rtable), |
e2422970 | 167 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
168 | }; |
169 | ||
170 | #define ECN_OR_COST(class) TC_PRIO_##class | |
171 | ||
4839c52b | 172 | const __u8 ip_tos2prio[16] = { |
1da177e4 LT |
173 | TC_PRIO_BESTEFFORT, |
174 | ECN_OR_COST(FILLER), | |
175 | TC_PRIO_BESTEFFORT, | |
176 | ECN_OR_COST(BESTEFFORT), | |
177 | TC_PRIO_BULK, | |
178 | ECN_OR_COST(BULK), | |
179 | TC_PRIO_BULK, | |
180 | ECN_OR_COST(BULK), | |
181 | TC_PRIO_INTERACTIVE, | |
182 | ECN_OR_COST(INTERACTIVE), | |
183 | TC_PRIO_INTERACTIVE, | |
184 | ECN_OR_COST(INTERACTIVE), | |
185 | TC_PRIO_INTERACTIVE_BULK, | |
186 | ECN_OR_COST(INTERACTIVE_BULK), | |
187 | TC_PRIO_INTERACTIVE_BULK, | |
188 | ECN_OR_COST(INTERACTIVE_BULK) | |
189 | }; | |
190 | ||
191 | ||
192 | /* | |
193 | * Route cache. | |
194 | */ | |
195 | ||
196 | /* The locking scheme is rather straight forward: | |
197 | * | |
198 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
199 | * 2) Only writers remove entries, and they hold the lock | |
200 | * as they look at rtable reference counts. | |
201 | * 3) Only readers acquire references to rtable entries, | |
202 | * they do so with atomic increments and with the | |
203 | * lock held. | |
204 | */ | |
205 | ||
206 | struct rt_hash_bucket { | |
207 | struct rtable *chain; | |
22c047cc | 208 | }; |
8a25d5de IM |
209 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
210 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
211 | /* |
212 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
213 | * The size of this table is a power of two and depends on the number of CPUS. | |
62051200 | 214 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 215 | */ |
62051200 IM |
216 | #ifdef CONFIG_LOCKDEP |
217 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 218 | #else |
62051200 IM |
219 | # if NR_CPUS >= 32 |
220 | # define RT_HASH_LOCK_SZ 4096 | |
221 | # elif NR_CPUS >= 16 | |
222 | # define RT_HASH_LOCK_SZ 2048 | |
223 | # elif NR_CPUS >= 8 | |
224 | # define RT_HASH_LOCK_SZ 1024 | |
225 | # elif NR_CPUS >= 4 | |
226 | # define RT_HASH_LOCK_SZ 512 | |
227 | # else | |
228 | # define RT_HASH_LOCK_SZ 256 | |
229 | # endif | |
22c047cc ED |
230 | #endif |
231 | ||
232 | static spinlock_t *rt_hash_locks; | |
233 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
1ff1cc20 PE |
234 | |
235 | static __init void rt_hash_lock_init(void) | |
236 | { | |
237 | int i; | |
238 | ||
239 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, | |
240 | GFP_KERNEL); | |
241 | if (!rt_hash_locks) | |
242 | panic("IP: failed to allocate rt_hash_locks\n"); | |
243 | ||
244 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) | |
245 | spin_lock_init(&rt_hash_locks[i]); | |
246 | } | |
22c047cc ED |
247 | #else |
248 | # define rt_hash_lock_addr(slot) NULL | |
1ff1cc20 PE |
249 | |
250 | static inline void rt_hash_lock_init(void) | |
251 | { | |
252 | } | |
22c047cc | 253 | #endif |
1da177e4 LT |
254 | |
255 | static struct rt_hash_bucket *rt_hash_table; | |
256 | static unsigned rt_hash_mask; | |
cfcabdcc | 257 | static unsigned int rt_hash_log; |
29e75252 | 258 | static atomic_t rt_genid; |
1da177e4 | 259 | |
2f970d83 | 260 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c | 261 | #define RT_CACHE_STAT_INC(field) \ |
bfe5d834 | 262 | (__raw_get_cpu_var(rt_cache_stat).field++) |
1da177e4 | 263 | |
cef2685e | 264 | static unsigned int rt_hash_code(u32 daddr, u32 saddr) |
1da177e4 | 265 | { |
29e75252 ED |
266 | return jhash_2words(daddr, saddr, atomic_read(&rt_genid)) |
267 | & rt_hash_mask; | |
1da177e4 LT |
268 | } |
269 | ||
8c7bc840 AV |
270 | #define rt_hash(daddr, saddr, idx) \ |
271 | rt_hash_code((__force u32)(__be32)(daddr),\ | |
272 | (__force u32)(__be32)(saddr) ^ ((idx) << 5)) | |
273 | ||
1da177e4 LT |
274 | #ifdef CONFIG_PROC_FS |
275 | struct rt_cache_iter_state { | |
a75e936f | 276 | struct seq_net_private p; |
1da177e4 | 277 | int bucket; |
29e75252 | 278 | int genid; |
1da177e4 LT |
279 | }; |
280 | ||
29e75252 | 281 | static struct rtable *rt_cache_get_first(struct rt_cache_iter_state *st) |
1da177e4 LT |
282 | { |
283 | struct rtable *r = NULL; | |
1da177e4 LT |
284 | |
285 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
286 | rcu_read_lock_bh(); | |
29e75252 ED |
287 | r = rcu_dereference(rt_hash_table[st->bucket].chain); |
288 | while (r) { | |
a75e936f DL |
289 | if (r->u.dst.dev->nd_net == st->p.net && |
290 | r->rt_genid == st->genid) | |
29e75252 ED |
291 | return r; |
292 | r = rcu_dereference(r->u.dst.rt_next); | |
293 | } | |
1da177e4 LT |
294 | rcu_read_unlock_bh(); |
295 | } | |
29e75252 | 296 | return r; |
1da177e4 LT |
297 | } |
298 | ||
642d6318 DL |
299 | static struct rtable *__rt_cache_get_next(struct rt_cache_iter_state *st, |
300 | struct rtable *r) | |
1da177e4 | 301 | { |
093c2ca4 | 302 | r = r->u.dst.rt_next; |
1da177e4 LT |
303 | while (!r) { |
304 | rcu_read_unlock_bh(); | |
305 | if (--st->bucket < 0) | |
306 | break; | |
307 | rcu_read_lock_bh(); | |
308 | r = rt_hash_table[st->bucket].chain; | |
309 | } | |
0bcceadc | 310 | return rcu_dereference(r); |
1da177e4 LT |
311 | } |
312 | ||
642d6318 DL |
313 | static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st, |
314 | struct rtable *r) | |
315 | { | |
316 | while ((r = __rt_cache_get_next(st, r)) != NULL) { | |
a75e936f DL |
317 | if (r->u.dst.dev->nd_net != st->p.net) |
318 | continue; | |
642d6318 DL |
319 | if (r->rt_genid == st->genid) |
320 | break; | |
321 | } | |
322 | return r; | |
323 | } | |
324 | ||
29e75252 | 325 | static struct rtable *rt_cache_get_idx(struct rt_cache_iter_state *st, loff_t pos) |
1da177e4 | 326 | { |
29e75252 | 327 | struct rtable *r = rt_cache_get_first(st); |
1da177e4 LT |
328 | |
329 | if (r) | |
642d6318 | 330 | while (pos && (r = rt_cache_get_next(st, r))) |
1da177e4 LT |
331 | --pos; |
332 | return pos ? NULL : r; | |
333 | } | |
334 | ||
335 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
336 | { | |
29e75252 ED |
337 | struct rt_cache_iter_state *st = seq->private; |
338 | ||
339 | if (*pos) | |
340 | return rt_cache_get_idx(st, *pos - 1); | |
341 | st->genid = atomic_read(&rt_genid); | |
342 | return SEQ_START_TOKEN; | |
1da177e4 LT |
343 | } |
344 | ||
345 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
346 | { | |
29e75252 ED |
347 | struct rtable *r; |
348 | struct rt_cache_iter_state *st = seq->private; | |
1da177e4 LT |
349 | |
350 | if (v == SEQ_START_TOKEN) | |
29e75252 | 351 | r = rt_cache_get_first(st); |
1da177e4 | 352 | else |
29e75252 | 353 | r = rt_cache_get_next(st, v); |
1da177e4 LT |
354 | ++*pos; |
355 | return r; | |
356 | } | |
357 | ||
358 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
359 | { | |
360 | if (v && v != SEQ_START_TOKEN) | |
361 | rcu_read_unlock_bh(); | |
362 | } | |
363 | ||
364 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
365 | { | |
366 | if (v == SEQ_START_TOKEN) | |
367 | seq_printf(seq, "%-127s\n", | |
368 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
369 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
370 | "HHUptod\tSpecDst"); | |
371 | else { | |
372 | struct rtable *r = v; | |
373 | char temp[256]; | |
374 | ||
375 | sprintf(temp, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" | |
376 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X", | |
377 | r->u.dst.dev ? r->u.dst.dev->name : "*", | |
378 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
379 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
380 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
381 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
382 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
383 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
384 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
385 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
386 | r->fl.fl4_tos, | |
387 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
388 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
389 | dev_queue_xmit) : 0, | |
390 | r->rt_spec_dst); | |
391 | seq_printf(seq, "%-127s\n", temp); | |
e905a9ed YH |
392 | } |
393 | return 0; | |
1da177e4 LT |
394 | } |
395 | ||
f690808e | 396 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
397 | .start = rt_cache_seq_start, |
398 | .next = rt_cache_seq_next, | |
399 | .stop = rt_cache_seq_stop, | |
400 | .show = rt_cache_seq_show, | |
401 | }; | |
402 | ||
403 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
404 | { | |
a75e936f | 405 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 406 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
407 | } |
408 | ||
9a32144e | 409 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
410 | .owner = THIS_MODULE, |
411 | .open = rt_cache_seq_open, | |
412 | .read = seq_read, | |
413 | .llseek = seq_lseek, | |
a75e936f | 414 | .release = seq_release_net, |
1da177e4 LT |
415 | }; |
416 | ||
417 | ||
418 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
419 | { | |
420 | int cpu; | |
421 | ||
422 | if (*pos == 0) | |
423 | return SEQ_START_TOKEN; | |
424 | ||
425 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
426 | if (!cpu_possible(cpu)) | |
427 | continue; | |
428 | *pos = cpu+1; | |
2f970d83 | 429 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
430 | } |
431 | return NULL; | |
432 | } | |
433 | ||
434 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
435 | { | |
436 | int cpu; | |
437 | ||
438 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
439 | if (!cpu_possible(cpu)) | |
440 | continue; | |
441 | *pos = cpu+1; | |
2f970d83 | 442 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
443 | } |
444 | return NULL; | |
e905a9ed | 445 | |
1da177e4 LT |
446 | } |
447 | ||
448 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
449 | { | |
450 | ||
451 | } | |
452 | ||
453 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
454 | { | |
455 | struct rt_cache_stat *st = v; | |
456 | ||
457 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 458 | 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 |
459 | return 0; |
460 | } | |
e905a9ed | 461 | |
1da177e4 LT |
462 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
463 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
464 | atomic_read(&ipv4_dst_ops.entries), | |
465 | st->in_hit, | |
466 | st->in_slow_tot, | |
467 | st->in_slow_mc, | |
468 | st->in_no_route, | |
469 | st->in_brd, | |
470 | st->in_martian_dst, | |
471 | st->in_martian_src, | |
472 | ||
473 | st->out_hit, | |
474 | st->out_slow_tot, | |
e905a9ed | 475 | st->out_slow_mc, |
1da177e4 LT |
476 | |
477 | st->gc_total, | |
478 | st->gc_ignored, | |
479 | st->gc_goal_miss, | |
480 | st->gc_dst_overflow, | |
481 | st->in_hlist_search, | |
482 | st->out_hlist_search | |
483 | ); | |
484 | return 0; | |
485 | } | |
486 | ||
f690808e | 487 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
488 | .start = rt_cpu_seq_start, |
489 | .next = rt_cpu_seq_next, | |
490 | .stop = rt_cpu_seq_stop, | |
491 | .show = rt_cpu_seq_show, | |
492 | }; | |
493 | ||
494 | ||
495 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
496 | { | |
497 | return seq_open(file, &rt_cpu_seq_ops); | |
498 | } | |
499 | ||
9a32144e | 500 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
501 | .owner = THIS_MODULE, |
502 | .open = rt_cpu_seq_open, | |
503 | .read = seq_read, | |
504 | .llseek = seq_lseek, | |
505 | .release = seq_release, | |
506 | }; | |
507 | ||
78c686e9 PE |
508 | #ifdef CONFIG_NET_CLS_ROUTE |
509 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
510 | int length, int *eof, void *data) | |
511 | { | |
512 | unsigned int i; | |
513 | ||
514 | if ((offset & 3) || (length & 3)) | |
515 | return -EIO; | |
516 | ||
517 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
518 | *eof = 1; | |
519 | return 0; | |
520 | } | |
521 | ||
522 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
523 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
524 | *eof = 1; | |
525 | } | |
526 | ||
527 | offset /= sizeof(u32); | |
528 | ||
529 | if (length > 0) { | |
530 | u32 *dst = (u32 *) buffer; | |
531 | ||
532 | *start = buffer; | |
533 | memset(dst, 0, length); | |
534 | ||
535 | for_each_possible_cpu(i) { | |
536 | unsigned int j; | |
537 | u32 *src; | |
538 | ||
539 | src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset; | |
540 | for (j = 0; j < length/4; j++) | |
541 | dst[j] += src[j]; | |
542 | } | |
543 | } | |
544 | return length; | |
545 | } | |
546 | #endif | |
107f1634 | 547 | |
73b38711 | 548 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
549 | { |
550 | struct proc_dir_entry *pde; | |
551 | ||
552 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
553 | &rt_cache_seq_fops); | |
554 | if (!pde) | |
555 | goto err1; | |
556 | ||
77020720 WC |
557 | pde = proc_create("rt_cache", S_IRUGO, |
558 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
559 | if (!pde) |
560 | goto err2; | |
561 | ||
107f1634 PE |
562 | #ifdef CONFIG_NET_CLS_ROUTE |
563 | pde = create_proc_read_entry("rt_acct", 0, net->proc_net, | |
564 | ip_rt_acct_read, NULL); | |
565 | if (!pde) | |
566 | goto err3; | |
567 | #endif | |
568 | return 0; | |
569 | ||
570 | #ifdef CONFIG_NET_CLS_ROUTE | |
571 | err3: | |
572 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
573 | #endif | |
574 | err2: | |
575 | remove_proc_entry("rt_cache", net->proc_net); | |
576 | err1: | |
577 | return -ENOMEM; | |
578 | } | |
73b38711 DL |
579 | |
580 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
581 | { | |
582 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
583 | remove_proc_entry("rt_cache", net->proc_net); | |
584 | remove_proc_entry("rt_acct", net->proc_net); | |
585 | } | |
586 | ||
587 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
588 | .init = ip_rt_do_proc_init, | |
589 | .exit = ip_rt_do_proc_exit, | |
590 | }; | |
591 | ||
592 | static int __init ip_rt_proc_init(void) | |
593 | { | |
594 | return register_pernet_subsys(&ip_rt_proc_ops); | |
595 | } | |
596 | ||
107f1634 | 597 | #else |
73b38711 | 598 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
599 | { |
600 | return 0; | |
601 | } | |
1da177e4 | 602 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 603 | |
1da177e4 LT |
604 | static __inline__ void rt_free(struct rtable *rt) |
605 | { | |
1da177e4 LT |
606 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
607 | } | |
608 | ||
609 | static __inline__ void rt_drop(struct rtable *rt) | |
610 | { | |
1da177e4 LT |
611 | ip_rt_put(rt); |
612 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
613 | } | |
614 | ||
615 | static __inline__ int rt_fast_clean(struct rtable *rth) | |
616 | { | |
617 | /* Kill broadcast/multicast entries very aggresively, if they | |
618 | collide in hash table with more useful entries */ | |
619 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 620 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
621 | } |
622 | ||
623 | static __inline__ int rt_valuable(struct rtable *rth) | |
624 | { | |
625 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
626 | rth->u.dst.expires; | |
627 | } | |
628 | ||
629 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
630 | { | |
631 | unsigned long age; | |
632 | int ret = 0; | |
633 | ||
634 | if (atomic_read(&rth->u.dst.__refcnt)) | |
635 | goto out; | |
636 | ||
637 | ret = 1; | |
638 | if (rth->u.dst.expires && | |
639 | time_after_eq(jiffies, rth->u.dst.expires)) | |
640 | goto out; | |
641 | ||
642 | age = jiffies - rth->u.dst.lastuse; | |
643 | ret = 0; | |
644 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
645 | (age <= tmo2 && rt_valuable(rth))) | |
646 | goto out; | |
647 | ret = 1; | |
648 | out: return ret; | |
649 | } | |
650 | ||
651 | /* Bits of score are: | |
652 | * 31: very valuable | |
653 | * 30: not quite useless | |
654 | * 29..0: usage counter | |
655 | */ | |
656 | static inline u32 rt_score(struct rtable *rt) | |
657 | { | |
658 | u32 score = jiffies - rt->u.dst.lastuse; | |
659 | ||
660 | score = ~score & ~(3<<30); | |
661 | ||
662 | if (rt_valuable(rt)) | |
663 | score |= (1<<31); | |
664 | ||
665 | if (!rt->fl.iif || | |
666 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
667 | score |= (1<<30); | |
668 | ||
669 | return score; | |
670 | } | |
671 | ||
672 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
673 | { | |
714e85be AV |
674 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
675 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 676 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
677 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
678 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
679 | (fl1->oif ^ fl2->oif) | | |
680 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
681 | } |
682 | ||
b5921910 DL |
683 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
684 | { | |
685 | return rt1->u.dst.dev->nd_net == rt2->u.dst.dev->nd_net; | |
686 | } | |
687 | ||
beb659bd ED |
688 | /* |
689 | * Perform a full scan of hash table and free all entries. | |
690 | * Can be called by a softirq or a process. | |
691 | * In the later case, we want to be reschedule if necessary | |
692 | */ | |
693 | static void rt_do_flush(int process_context) | |
694 | { | |
695 | unsigned int i; | |
696 | struct rtable *rth, *next; | |
697 | ||
698 | for (i = 0; i <= rt_hash_mask; i++) { | |
699 | if (process_context && need_resched()) | |
700 | cond_resched(); | |
701 | rth = rt_hash_table[i].chain; | |
702 | if (!rth) | |
703 | continue; | |
704 | ||
705 | spin_lock_bh(rt_hash_lock_addr(i)); | |
706 | rth = rt_hash_table[i].chain; | |
707 | rt_hash_table[i].chain = NULL; | |
708 | spin_unlock_bh(rt_hash_lock_addr(i)); | |
709 | ||
710 | for (; rth; rth = next) { | |
711 | next = rth->u.dst.rt_next; | |
712 | rt_free(rth); | |
713 | } | |
714 | } | |
715 | } | |
716 | ||
717 | static void rt_check_expire(void) | |
1da177e4 | 718 | { |
bb1d23b0 ED |
719 | static unsigned int rover; |
720 | unsigned int i = rover, goal; | |
1da177e4 | 721 | struct rtable *rth, **rthp; |
bb1d23b0 ED |
722 | u64 mult; |
723 | ||
724 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
725 | if (ip_rt_gc_timeout > 1) | |
726 | do_div(mult, ip_rt_gc_timeout); | |
727 | goal = (unsigned int)mult; | |
39c90ece ED |
728 | if (goal > rt_hash_mask) |
729 | goal = rt_hash_mask + 1; | |
bb1d23b0 | 730 | for (; goal > 0; goal--) { |
1da177e4 LT |
731 | unsigned long tmo = ip_rt_gc_timeout; |
732 | ||
733 | i = (i + 1) & rt_hash_mask; | |
734 | rthp = &rt_hash_table[i].chain; | |
735 | ||
d90bf5a9 ED |
736 | if (need_resched()) |
737 | cond_resched(); | |
738 | ||
cfcabdcc | 739 | if (*rthp == NULL) |
bb1d23b0 | 740 | continue; |
39c90ece | 741 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 | 742 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
743 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
744 | *rthp = rth->u.dst.rt_next; | |
745 | rt_free(rth); | |
746 | continue; | |
747 | } | |
1da177e4 LT |
748 | if (rth->u.dst.expires) { |
749 | /* Entry is expired even if it is in use */ | |
39c90ece | 750 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
1da177e4 | 751 | tmo >>= 1; |
093c2ca4 | 752 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
753 | continue; |
754 | } | |
755 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
756 | tmo >>= 1; | |
093c2ca4 | 757 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
758 | continue; |
759 | } | |
760 | ||
761 | /* Cleanup aged off entries. */ | |
093c2ca4 | 762 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 763 | rt_free(rth); |
1da177e4 | 764 | } |
39c90ece | 765 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
766 | } |
767 | rover = i; | |
beb659bd ED |
768 | } |
769 | ||
770 | /* | |
771 | * rt_worker_func() is run in process context. | |
29e75252 | 772 | * we call rt_check_expire() to scan part of the hash table |
beb659bd ED |
773 | */ |
774 | static void rt_worker_func(struct work_struct *work) | |
775 | { | |
29e75252 | 776 | rt_check_expire(); |
39c90ece | 777 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
1da177e4 LT |
778 | } |
779 | ||
29e75252 ED |
780 | /* |
781 | * Pertubation of rt_genid by a small quantity [1..256] | |
782 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() | |
783 | * many times (2^24) without giving recent rt_genid. | |
784 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 785 | */ |
29e75252 | 786 | static void rt_cache_invalidate(void) |
1da177e4 | 787 | { |
29e75252 | 788 | unsigned char shuffle; |
1da177e4 | 789 | |
29e75252 ED |
790 | get_random_bytes(&shuffle, sizeof(shuffle)); |
791 | atomic_add(shuffle + 1U, &rt_genid); | |
1da177e4 LT |
792 | } |
793 | ||
29e75252 ED |
794 | /* |
795 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
796 | * delay >= 0 : invalidate & flush cache (can be long) | |
797 | */ | |
1da177e4 LT |
798 | void rt_cache_flush(int delay) |
799 | { | |
29e75252 ED |
800 | rt_cache_invalidate(); |
801 | if (delay >= 0) | |
802 | rt_do_flush(!in_softirq()); | |
1da177e4 LT |
803 | } |
804 | ||
beb659bd | 805 | /* |
29e75252 | 806 | * We change rt_genid and let gc do the cleanup |
beb659bd | 807 | */ |
1da177e4 LT |
808 | static void rt_secret_rebuild(unsigned long dummy) |
809 | { | |
29e75252 | 810 | rt_cache_invalidate(); |
beb659bd | 811 | mod_timer(&rt_secret_timer, jiffies + ip_rt_secret_interval); |
1da177e4 LT |
812 | } |
813 | ||
814 | /* | |
815 | Short description of GC goals. | |
816 | ||
817 | We want to build algorithm, which will keep routing cache | |
818 | at some equilibrium point, when number of aged off entries | |
819 | is kept approximately equal to newly generated ones. | |
820 | ||
821 | Current expiration strength is variable "expire". | |
822 | We try to adjust it dynamically, so that if networking | |
823 | is idle expires is large enough to keep enough of warm entries, | |
824 | and when load increases it reduces to limit cache size. | |
825 | */ | |
826 | ||
569d3645 | 827 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
828 | { |
829 | static unsigned long expire = RT_GC_TIMEOUT; | |
830 | static unsigned long last_gc; | |
831 | static int rover; | |
832 | static int equilibrium; | |
833 | struct rtable *rth, **rthp; | |
834 | unsigned long now = jiffies; | |
835 | int goal; | |
836 | ||
837 | /* | |
838 | * Garbage collection is pretty expensive, | |
839 | * do not make it too frequently. | |
840 | */ | |
841 | ||
842 | RT_CACHE_STAT_INC(gc_total); | |
843 | ||
844 | if (now - last_gc < ip_rt_gc_min_interval && | |
845 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
846 | RT_CACHE_STAT_INC(gc_ignored); | |
847 | goto out; | |
848 | } | |
849 | ||
850 | /* Calculate number of entries, which we want to expire now. */ | |
851 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
852 | (ip_rt_gc_elasticity << rt_hash_log); | |
853 | if (goal <= 0) { | |
854 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
855 | equilibrium = ipv4_dst_ops.gc_thresh; | |
856 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
857 | if (goal > 0) { | |
b790cedd | 858 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
859 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
860 | } | |
861 | } else { | |
862 | /* We are in dangerous area. Try to reduce cache really | |
863 | * aggressively. | |
864 | */ | |
b790cedd | 865 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
866 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
867 | } | |
868 | ||
869 | if (now - last_gc >= ip_rt_gc_min_interval) | |
870 | last_gc = now; | |
871 | ||
872 | if (goal <= 0) { | |
873 | equilibrium += goal; | |
874 | goto work_done; | |
875 | } | |
876 | ||
877 | do { | |
878 | int i, k; | |
879 | ||
880 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
881 | unsigned long tmo = expire; | |
882 | ||
883 | k = (k + 1) & rt_hash_mask; | |
884 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 885 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 | 886 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
887 | if (rth->rt_genid == atomic_read(&rt_genid) && |
888 | !rt_may_expire(rth, tmo, expire)) { | |
1da177e4 | 889 | tmo >>= 1; |
093c2ca4 | 890 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
891 | continue; |
892 | } | |
093c2ca4 | 893 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
894 | rt_free(rth); |
895 | goal--; | |
1da177e4 | 896 | } |
22c047cc | 897 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
898 | if (goal <= 0) |
899 | break; | |
900 | } | |
901 | rover = k; | |
902 | ||
903 | if (goal <= 0) | |
904 | goto work_done; | |
905 | ||
906 | /* Goal is not achieved. We stop process if: | |
907 | ||
908 | - if expire reduced to zero. Otherwise, expire is halfed. | |
909 | - if table is not full. | |
910 | - if we are called from interrupt. | |
911 | - jiffies check is just fallback/debug loop breaker. | |
912 | We will not spin here for long time in any case. | |
913 | */ | |
914 | ||
915 | RT_CACHE_STAT_INC(gc_goal_miss); | |
916 | ||
917 | if (expire == 0) | |
918 | break; | |
919 | ||
920 | expire >>= 1; | |
921 | #if RT_CACHE_DEBUG >= 2 | |
922 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
923 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
924 | #endif | |
925 | ||
926 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
927 | goto out; | |
928 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
929 | ||
930 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
931 | goto out; | |
932 | if (net_ratelimit()) | |
933 | printk(KERN_WARNING "dst cache overflow\n"); | |
934 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
935 | return 1; | |
936 | ||
937 | work_done: | |
938 | expire += ip_rt_gc_min_interval; | |
939 | if (expire > ip_rt_gc_timeout || | |
940 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
941 | expire = ip_rt_gc_timeout; | |
942 | #if RT_CACHE_DEBUG >= 2 | |
943 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
944 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
945 | #endif | |
946 | out: return 0; | |
947 | } | |
948 | ||
949 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
950 | { | |
951 | struct rtable *rth, **rthp; | |
952 | unsigned long now; | |
953 | struct rtable *cand, **candp; | |
954 | u32 min_score; | |
955 | int chain_length; | |
956 | int attempts = !in_softirq(); | |
957 | ||
958 | restart: | |
959 | chain_length = 0; | |
960 | min_score = ~(u32)0; | |
961 | cand = NULL; | |
962 | candp = NULL; | |
963 | now = jiffies; | |
964 | ||
965 | rthp = &rt_hash_table[hash].chain; | |
966 | ||
22c047cc | 967 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 968 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
969 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
970 | *rthp = rth->u.dst.rt_next; | |
971 | rt_free(rth); | |
972 | continue; | |
973 | } | |
b5921910 | 974 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
1da177e4 | 975 | /* Put it first */ |
093c2ca4 | 976 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
977 | /* |
978 | * Since lookup is lockfree, the deletion | |
979 | * must be visible to another weakly ordered CPU before | |
980 | * the insertion at the start of the hash chain. | |
981 | */ | |
093c2ca4 | 982 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
983 | rt_hash_table[hash].chain); |
984 | /* | |
985 | * Since lookup is lockfree, the update writes | |
986 | * must be ordered for consistency on SMP. | |
987 | */ | |
988 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
989 | ||
03f49f34 | 990 | dst_use(&rth->u.dst, now); |
22c047cc | 991 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
992 | |
993 | rt_drop(rt); | |
994 | *rp = rth; | |
995 | return 0; | |
996 | } | |
997 | ||
998 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
999 | u32 score = rt_score(rth); | |
1000 | ||
1001 | if (score <= min_score) { | |
1002 | cand = rth; | |
1003 | candp = rthp; | |
1004 | min_score = score; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | chain_length++; | |
1009 | ||
093c2ca4 | 1010 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | if (cand) { | |
1014 | /* ip_rt_gc_elasticity used to be average length of chain | |
1015 | * length, when exceeded gc becomes really aggressive. | |
1016 | * | |
1017 | * The second limit is less certain. At the moment it allows | |
1018 | * only 2 entries per bucket. We will see. | |
1019 | */ | |
1020 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 1021 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
1022 | rt_free(cand); |
1023 | } | |
1024 | } | |
1025 | ||
1026 | /* Try to bind route to arp only if it is output | |
1027 | route or unicast forwarding path. | |
1028 | */ | |
1029 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
1030 | int err = arp_bind_neighbour(&rt->u.dst); | |
1031 | if (err) { | |
22c047cc | 1032 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1033 | |
1034 | if (err != -ENOBUFS) { | |
1035 | rt_drop(rt); | |
1036 | return err; | |
1037 | } | |
1038 | ||
1039 | /* Neighbour tables are full and nothing | |
1040 | can be released. Try to shrink route cache, | |
1041 | it is most likely it holds some neighbour records. | |
1042 | */ | |
1043 | if (attempts-- > 0) { | |
1044 | int saved_elasticity = ip_rt_gc_elasticity; | |
1045 | int saved_int = ip_rt_gc_min_interval; | |
1046 | ip_rt_gc_elasticity = 1; | |
1047 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1048 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1049 | ip_rt_gc_min_interval = saved_int; |
1050 | ip_rt_gc_elasticity = saved_elasticity; | |
1051 | goto restart; | |
1052 | } | |
1053 | ||
1054 | if (net_ratelimit()) | |
1055 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1056 | rt_drop(rt); | |
1057 | return -ENOBUFS; | |
1058 | } | |
1059 | } | |
1060 | ||
093c2ca4 | 1061 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
1da177e4 | 1062 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 1063 | if (rt->u.dst.rt_next) { |
1da177e4 LT |
1064 | struct rtable *trt; |
1065 | printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash, | |
1066 | NIPQUAD(rt->rt_dst)); | |
093c2ca4 | 1067 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
1da177e4 LT |
1068 | printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst)); |
1069 | printk("\n"); | |
1070 | } | |
1071 | #endif | |
1072 | rt_hash_table[hash].chain = rt; | |
22c047cc | 1073 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1074 | *rp = rt; |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | void rt_bind_peer(struct rtable *rt, int create) | |
1079 | { | |
1080 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1081 | struct inet_peer *peer; | |
1082 | ||
1083 | peer = inet_getpeer(rt->rt_dst, create); | |
1084 | ||
1085 | spin_lock_bh(&rt_peer_lock); | |
1086 | if (rt->peer == NULL) { | |
1087 | rt->peer = peer; | |
1088 | peer = NULL; | |
1089 | } | |
1090 | spin_unlock_bh(&rt_peer_lock); | |
1091 | if (peer) | |
1092 | inet_putpeer(peer); | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1097 | * we still can generate some output. | |
1098 | * Random ID selection looks a bit dangerous because we have no chances to | |
1099 | * select ID being unique in a reasonable period of time. | |
1100 | * But broken packet identifier may be better than no packet at all. | |
1101 | */ | |
1102 | static void ip_select_fb_ident(struct iphdr *iph) | |
1103 | { | |
1104 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1105 | static u32 ip_fallback_id; | |
1106 | u32 salt; | |
1107 | ||
1108 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1109 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1110 | iph->id = htons(salt & 0xFFFF); |
1111 | ip_fallback_id = salt; | |
1112 | spin_unlock_bh(&ip_fb_id_lock); | |
1113 | } | |
1114 | ||
1115 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1116 | { | |
1117 | struct rtable *rt = (struct rtable *) dst; | |
1118 | ||
1119 | if (rt) { | |
1120 | if (rt->peer == NULL) | |
1121 | rt_bind_peer(rt, 1); | |
1122 | ||
1123 | /* If peer is attached to destination, it is never detached, | |
1124 | so that we need not to grab a lock to dereference it. | |
1125 | */ | |
1126 | if (rt->peer) { | |
1127 | iph->id = htons(inet_getid(rt->peer, more)); | |
1128 | return; | |
1129 | } | |
1130 | } else | |
e905a9ed | 1131 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1132 | __builtin_return_address(0)); |
1da177e4 LT |
1133 | |
1134 | ip_select_fb_ident(iph); | |
1135 | } | |
1136 | ||
1137 | static void rt_del(unsigned hash, struct rtable *rt) | |
1138 | { | |
29e75252 | 1139 | struct rtable **rthp, *aux; |
1da177e4 | 1140 | |
29e75252 | 1141 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1142 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1143 | ip_rt_put(rt); |
29e75252 ED |
1144 | while ((aux = *rthp) != NULL) { |
1145 | if (aux == rt || (aux->rt_genid != atomic_read(&rt_genid))) { | |
1146 | *rthp = aux->u.dst.rt_next; | |
1147 | rt_free(aux); | |
1148 | continue; | |
1da177e4 | 1149 | } |
29e75252 ED |
1150 | rthp = &aux->u.dst.rt_next; |
1151 | } | |
22c047cc | 1152 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1153 | } |
1154 | ||
f7655229 AV |
1155 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1156 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1157 | { |
1158 | int i, k; | |
1159 | struct in_device *in_dev = in_dev_get(dev); | |
1160 | struct rtable *rth, **rthp; | |
f7655229 | 1161 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1162 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1163 | struct netevent_redirect netevent; |
317805b8 | 1164 | struct net *net; |
1da177e4 | 1165 | |
1da177e4 LT |
1166 | if (!in_dev) |
1167 | return; | |
1168 | ||
317805b8 | 1169 | net = dev->nd_net; |
1da177e4 | 1170 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
1e637c74 | 1171 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
f97c1e0c | 1172 | || ipv4_is_zeronet(new_gw)) |
1da177e4 LT |
1173 | goto reject_redirect; |
1174 | ||
1175 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1176 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1177 | goto reject_redirect; | |
1178 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1179 | goto reject_redirect; | |
1180 | } else { | |
317805b8 | 1181 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1182 | goto reject_redirect; |
1183 | } | |
1184 | ||
1185 | for (i = 0; i < 2; i++) { | |
1186 | for (k = 0; k < 2; k++) { | |
8c7bc840 | 1187 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]); |
1da177e4 LT |
1188 | |
1189 | rthp=&rt_hash_table[hash].chain; | |
1190 | ||
1191 | rcu_read_lock(); | |
1192 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1193 | struct rtable *rt; | |
1194 | ||
1195 | if (rth->fl.fl4_dst != daddr || | |
1196 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 | 1197 | rth->fl.oif != ikeys[k] || |
29e75252 | 1198 | rth->fl.iif != 0 || |
317805b8 DL |
1199 | rth->rt_genid != atomic_read(&rt_genid) || |
1200 | rth->u.dst.dev->nd_net != net) { | |
093c2ca4 | 1201 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1202 | continue; |
1203 | } | |
1204 | ||
1205 | if (rth->rt_dst != daddr || | |
1206 | rth->rt_src != saddr || | |
1207 | rth->u.dst.error || | |
1208 | rth->rt_gateway != old_gw || | |
1209 | rth->u.dst.dev != dev) | |
1210 | break; | |
1211 | ||
1212 | dst_hold(&rth->u.dst); | |
1213 | rcu_read_unlock(); | |
1214 | ||
1215 | rt = dst_alloc(&ipv4_dst_ops); | |
1216 | if (rt == NULL) { | |
1217 | ip_rt_put(rth); | |
1218 | in_dev_put(in_dev); | |
1219 | return; | |
1220 | } | |
1221 | ||
1222 | /* Copy all the information. */ | |
1223 | *rt = *rth; | |
e905a9ed | 1224 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
1da177e4 LT |
1225 | rt->u.dst.__use = 1; |
1226 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1227 | rt->u.dst.child = NULL; | |
1228 | if (rt->u.dst.dev) | |
1229 | dev_hold(rt->u.dst.dev); | |
1230 | if (rt->idev) | |
1231 | in_dev_hold(rt->idev); | |
1232 | rt->u.dst.obsolete = 0; | |
1233 | rt->u.dst.lastuse = jiffies; | |
1234 | rt->u.dst.path = &rt->u.dst; | |
1235 | rt->u.dst.neighbour = NULL; | |
1236 | rt->u.dst.hh = NULL; | |
1237 | rt->u.dst.xfrm = NULL; | |
29e75252 | 1238 | rt->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1239 | rt->rt_flags |= RTCF_REDIRECTED; |
1240 | ||
1241 | /* Gateway is different ... */ | |
1242 | rt->rt_gateway = new_gw; | |
1243 | ||
1244 | /* Redirect received -> path was valid */ | |
1245 | dst_confirm(&rth->u.dst); | |
1246 | ||
1247 | if (rt->peer) | |
1248 | atomic_inc(&rt->peer->refcnt); | |
1249 | ||
1250 | if (arp_bind_neighbour(&rt->u.dst) || | |
1251 | !(rt->u.dst.neighbour->nud_state & | |
1252 | NUD_VALID)) { | |
1253 | if (rt->u.dst.neighbour) | |
1254 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1255 | ip_rt_put(rth); | |
1256 | rt_drop(rt); | |
1257 | goto do_next; | |
1258 | } | |
e905a9ed | 1259 | |
8d71740c TT |
1260 | netevent.old = &rth->u.dst; |
1261 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1262 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1263 | &netevent); | |
1da177e4 LT |
1264 | |
1265 | rt_del(hash, rth); | |
1266 | if (!rt_intern_hash(hash, rt, &rt)) | |
1267 | ip_rt_put(rt); | |
1268 | goto do_next; | |
1269 | } | |
1270 | rcu_read_unlock(); | |
1271 | do_next: | |
1272 | ; | |
1273 | } | |
1274 | } | |
1275 | in_dev_put(in_dev); | |
1276 | return; | |
1277 | ||
1278 | reject_redirect: | |
1279 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1280 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
1281 | printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about " | |
1282 | "%u.%u.%u.%u ignored.\n" | |
cef2685e | 1283 | " Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n", |
1da177e4 | 1284 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1285 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1286 | #endif |
1287 | in_dev_put(in_dev); | |
1288 | } | |
1289 | ||
1290 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1291 | { | |
ee6b9673 | 1292 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
1293 | struct dst_entry *ret = dst; |
1294 | ||
1295 | if (rt) { | |
1296 | if (dst->obsolete) { | |
1297 | ip_rt_put(rt); | |
1298 | ret = NULL; | |
1299 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1300 | rt->u.dst.expires) { | |
8c7bc840 AV |
1301 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
1302 | rt->fl.oif); | |
1da177e4 | 1303 | #if RT_CACHE_DEBUG >= 1 |
56c99d04 | 1304 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to " |
1da177e4 LT |
1305 | "%u.%u.%u.%u/%02x dropped\n", |
1306 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); | |
1307 | #endif | |
1308 | rt_del(hash, rt); | |
1309 | ret = NULL; | |
1310 | } | |
1311 | } | |
1312 | return ret; | |
1313 | } | |
1314 | ||
1315 | /* | |
1316 | * Algorithm: | |
1317 | * 1. The first ip_rt_redirect_number redirects are sent | |
1318 | * with exponential backoff, then we stop sending them at all, | |
1319 | * assuming that the host ignores our redirects. | |
1320 | * 2. If we did not see packets requiring redirects | |
1321 | * during ip_rt_redirect_silence, we assume that the host | |
1322 | * forgot redirected route and start to send redirects again. | |
1323 | * | |
1324 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1325 | * in icmp.c. | |
1326 | * | |
1327 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1328 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1329 | */ | |
1330 | ||
1331 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1332 | { | |
ee6b9673 | 1333 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1334 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
1335 | ||
1336 | if (!in_dev) | |
1337 | return; | |
1338 | ||
1339 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1340 | goto out; | |
1341 | ||
1342 | /* No redirected packets during ip_rt_redirect_silence; | |
1343 | * reset the algorithm. | |
1344 | */ | |
1345 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1346 | rt->u.dst.rate_tokens = 0; | |
1347 | ||
1348 | /* Too many ignored redirects; do not send anything | |
1349 | * set u.dst.rate_last to the last seen redirected packet. | |
1350 | */ | |
1351 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1352 | rt->u.dst.rate_last = jiffies; | |
1353 | goto out; | |
1354 | } | |
1355 | ||
1356 | /* Check for load limit; set rate_last to the latest sent | |
1357 | * redirect. | |
1358 | */ | |
14fb8a76 LY |
1359 | if (rt->u.dst.rate_tokens == 0 || |
1360 | time_after(jiffies, | |
1da177e4 LT |
1361 | (rt->u.dst.rate_last + |
1362 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1363 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1364 | rt->u.dst.rate_last = jiffies; | |
1365 | ++rt->u.dst.rate_tokens; | |
1366 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1367 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1368 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1369 | net_ratelimit()) | |
1370 | printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores " | |
1371 | "redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n", | |
1372 | NIPQUAD(rt->rt_src), rt->rt_iif, | |
1373 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1374 | #endif | |
1375 | } | |
1376 | out: | |
e905a9ed | 1377 | in_dev_put(in_dev); |
1da177e4 LT |
1378 | } |
1379 | ||
1380 | static int ip_error(struct sk_buff *skb) | |
1381 | { | |
ee6b9673 | 1382 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1383 | unsigned long now; |
1384 | int code; | |
1385 | ||
1386 | switch (rt->u.dst.error) { | |
1387 | case EINVAL: | |
1388 | default: | |
1389 | goto out; | |
1390 | case EHOSTUNREACH: | |
1391 | code = ICMP_HOST_UNREACH; | |
1392 | break; | |
1393 | case ENETUNREACH: | |
1394 | code = ICMP_NET_UNREACH; | |
7f53878d | 1395 | IP_INC_STATS_BH(IPSTATS_MIB_INNOROUTES); |
1da177e4 LT |
1396 | break; |
1397 | case EACCES: | |
1398 | code = ICMP_PKT_FILTERED; | |
1399 | break; | |
1400 | } | |
1401 | ||
1402 | now = jiffies; | |
1403 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1404 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1405 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1406 | rt->u.dst.rate_last = now; | |
1407 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1408 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1409 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1410 | } | |
1411 | ||
1412 | out: kfree_skb(skb); | |
1413 | return 0; | |
e905a9ed | 1414 | } |
1da177e4 LT |
1415 | |
1416 | /* | |
1417 | * The last two values are not from the RFC but | |
1418 | * are needed for AMPRnet AX.25 paths. | |
1419 | */ | |
1420 | ||
9b5b5cff | 1421 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1422 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1423 | ||
1424 | static __inline__ unsigned short guess_mtu(unsigned short old_mtu) | |
1425 | { | |
1426 | int i; | |
e905a9ed | 1427 | |
1da177e4 LT |
1428 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1429 | if (old_mtu > mtu_plateau[i]) | |
1430 | return mtu_plateau[i]; | |
1431 | return 68; | |
1432 | } | |
1433 | ||
b5921910 DL |
1434 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
1435 | unsigned short new_mtu) | |
1da177e4 LT |
1436 | { |
1437 | int i; | |
1438 | unsigned short old_mtu = ntohs(iph->tot_len); | |
1439 | struct rtable *rth; | |
e448515c AV |
1440 | __be32 skeys[2] = { iph->saddr, 0, }; |
1441 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1442 | unsigned short est_mtu = 0; |
1443 | ||
1444 | if (ipv4_config.no_pmtu_disc) | |
1445 | return 0; | |
1446 | ||
1447 | for (i = 0; i < 2; i++) { | |
8c7bc840 | 1448 | unsigned hash = rt_hash(daddr, skeys[i], 0); |
1da177e4 LT |
1449 | |
1450 | rcu_read_lock(); | |
1451 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 1452 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
1453 | if (rth->fl.fl4_dst == daddr && |
1454 | rth->fl.fl4_src == skeys[i] && | |
1455 | rth->rt_dst == daddr && | |
1456 | rth->rt_src == iph->saddr && | |
1da177e4 | 1457 | rth->fl.iif == 0 && |
b5921910 | 1458 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU)) && |
29e75252 ED |
1459 | rth->u.dst.dev->nd_net == net && |
1460 | rth->rt_genid == atomic_read(&rt_genid)) { | |
1da177e4 LT |
1461 | unsigned short mtu = new_mtu; |
1462 | ||
1463 | if (new_mtu < 68 || new_mtu >= old_mtu) { | |
1464 | ||
1465 | /* BSD 4.2 compatibility hack :-( */ | |
1466 | if (mtu == 0 && | |
1467 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && | |
1468 | old_mtu >= 68 + (iph->ihl << 2)) | |
1469 | old_mtu -= iph->ihl << 2; | |
1470 | ||
1471 | mtu = guess_mtu(old_mtu); | |
1472 | } | |
1473 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { | |
e905a9ed | 1474 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { |
1da177e4 LT |
1475 | dst_confirm(&rth->u.dst); |
1476 | if (mtu < ip_rt_min_pmtu) { | |
1477 | mtu = ip_rt_min_pmtu; | |
1478 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1479 | (1 << RTAX_MTU); | |
1480 | } | |
1481 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1482 | dst_set_expires(&rth->u.dst, | |
1483 | ip_rt_mtu_expires); | |
1484 | } | |
1485 | est_mtu = mtu; | |
1486 | } | |
1487 | } | |
1488 | } | |
1489 | rcu_read_unlock(); | |
1490 | } | |
1491 | return est_mtu ? : new_mtu; | |
1492 | } | |
1493 | ||
1494 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1495 | { | |
1496 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && | |
1497 | !(dst_metric_locked(dst, RTAX_MTU))) { | |
1498 | if (mtu < ip_rt_min_pmtu) { | |
1499 | mtu = ip_rt_min_pmtu; | |
1500 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1501 | } | |
1502 | dst->metrics[RTAX_MTU-1] = mtu; | |
1503 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1504 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1505 | } |
1506 | } | |
1507 | ||
1508 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1509 | { | |
1510 | return NULL; | |
1511 | } | |
1512 | ||
1513 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1514 | { | |
1515 | struct rtable *rt = (struct rtable *) dst; | |
1516 | struct inet_peer *peer = rt->peer; | |
1517 | struct in_device *idev = rt->idev; | |
1518 | ||
1519 | if (peer) { | |
1520 | rt->peer = NULL; | |
1521 | inet_putpeer(peer); | |
1522 | } | |
1523 | ||
1524 | if (idev) { | |
1525 | rt->idev = NULL; | |
1526 | in_dev_put(idev); | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1531 | int how) | |
1532 | { | |
1533 | struct rtable *rt = (struct rtable *) dst; | |
1534 | struct in_device *idev = rt->idev; | |
5a3e55d6 DL |
1535 | if (dev != dev->nd_net->loopback_dev && idev && idev->dev == dev) { |
1536 | struct in_device *loopback_idev = | |
1537 | in_dev_get(dev->nd_net->loopback_dev); | |
1da177e4 LT |
1538 | if (loopback_idev) { |
1539 | rt->idev = loopback_idev; | |
1540 | in_dev_put(idev); | |
1541 | } | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | static void ipv4_link_failure(struct sk_buff *skb) | |
1546 | { | |
1547 | struct rtable *rt; | |
1548 | ||
1549 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1550 | ||
ee6b9673 | 1551 | rt = skb->rtable; |
1da177e4 LT |
1552 | if (rt) |
1553 | dst_set_expires(&rt->u.dst, 0); | |
1554 | } | |
1555 | ||
1556 | static int ip_rt_bug(struct sk_buff *skb) | |
1557 | { | |
1558 | printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n", | |
eddc9ec5 | 1559 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
1da177e4 LT |
1560 | skb->dev ? skb->dev->name : "?"); |
1561 | kfree_skb(skb); | |
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | We do not cache source address of outgoing interface, | |
1567 | because it is used only by IP RR, TS and SRR options, | |
1568 | so that it out of fast path. | |
1569 | ||
1570 | BTW remember: "addr" is allowed to be not aligned | |
1571 | in IP options! | |
1572 | */ | |
1573 | ||
1574 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1575 | { | |
a61ced5d | 1576 | __be32 src; |
1da177e4 LT |
1577 | struct fib_result res; |
1578 | ||
1579 | if (rt->fl.iif == 0) | |
1580 | src = rt->rt_src; | |
ecfdc8c5 | 1581 | else if (fib_lookup(rt->u.dst.dev->nd_net, &rt->fl, &res) == 0) { |
1da177e4 LT |
1582 | src = FIB_RES_PREFSRC(res); |
1583 | fib_res_put(&res); | |
1584 | } else | |
1585 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1586 | RT_SCOPE_UNIVERSE); | |
1587 | memcpy(addr, &src, 4); | |
1588 | } | |
1589 | ||
1590 | #ifdef CONFIG_NET_CLS_ROUTE | |
1591 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1592 | { | |
1593 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1594 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1595 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1596 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1597 | } | |
1598 | #endif | |
1599 | ||
1600 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1601 | { | |
1602 | struct fib_info *fi = res->fi; | |
1603 | ||
1604 | if (fi) { | |
1605 | if (FIB_RES_GW(*res) && | |
1606 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1607 | rt->rt_gateway = FIB_RES_GW(*res); | |
1608 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1609 | sizeof(rt->u.dst.metrics)); | |
1610 | if (fi->fib_mtu == 0) { | |
1611 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
1612 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && | |
1613 | rt->rt_gateway != rt->rt_dst && | |
1614 | rt->u.dst.dev->mtu > 576) | |
1615 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1616 | } | |
1617 | #ifdef CONFIG_NET_CLS_ROUTE | |
1618 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1619 | #endif | |
1620 | } else | |
1621 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1622 | ||
1623 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1624 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; | |
1625 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) | |
1626 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; | |
1627 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) | |
1628 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, | |
1629 | ip_rt_min_advmss); | |
1630 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) | |
1631 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; | |
1632 | ||
1633 | #ifdef CONFIG_NET_CLS_ROUTE | |
1634 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1635 | set_class_tag(rt, fib_rules_tclass(res)); | |
1636 | #endif | |
1637 | set_class_tag(rt, itag); | |
1638 | #endif | |
e905a9ed | 1639 | rt->rt_type = res->type; |
1da177e4 LT |
1640 | } |
1641 | ||
9e12bb22 | 1642 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1643 | u8 tos, struct net_device *dev, int our) |
1644 | { | |
1645 | unsigned hash; | |
1646 | struct rtable *rth; | |
a61ced5d | 1647 | __be32 spec_dst; |
1da177e4 LT |
1648 | struct in_device *in_dev = in_dev_get(dev); |
1649 | u32 itag = 0; | |
1650 | ||
1651 | /* Primary sanity checks. */ | |
1652 | ||
1653 | if (in_dev == NULL) | |
1654 | return -EINVAL; | |
1655 | ||
1e637c74 | 1656 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1657 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1658 | goto e_inval; |
1659 | ||
f97c1e0c JP |
1660 | if (ipv4_is_zeronet(saddr)) { |
1661 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1662 | goto e_inval; |
1663 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1664 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1665 | dev, &spec_dst, &itag) < 0) | |
1666 | goto e_inval; | |
1667 | ||
1668 | rth = dst_alloc(&ipv4_dst_ops); | |
1669 | if (!rth) | |
1670 | goto e_nobufs; | |
1671 | ||
1672 | rth->u.dst.output= ip_rt_bug; | |
1673 | ||
1674 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1675 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1676 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1677 | rth->u.dst.flags |= DST_NOPOLICY; |
1678 | rth->fl.fl4_dst = daddr; | |
1679 | rth->rt_dst = daddr; | |
1680 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1681 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1682 | rth->fl.fl4_src = saddr; |
1683 | rth->rt_src = saddr; | |
1684 | #ifdef CONFIG_NET_CLS_ROUTE | |
1685 | rth->u.dst.tclassid = itag; | |
1686 | #endif | |
1687 | rth->rt_iif = | |
1688 | rth->fl.iif = dev->ifindex; | |
2774c7ab | 1689 | rth->u.dst.dev = init_net.loopback_dev; |
1da177e4 LT |
1690 | dev_hold(rth->u.dst.dev); |
1691 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1692 | rth->fl.oif = 0; | |
1693 | rth->rt_gateway = daddr; | |
1694 | rth->rt_spec_dst= spec_dst; | |
29e75252 | 1695 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 | 1696 | rth->rt_flags = RTCF_MULTICAST; |
29e75252 | 1697 | rth->rt_type = RTN_MULTICAST; |
1da177e4 LT |
1698 | if (our) { |
1699 | rth->u.dst.input= ip_local_deliver; | |
1700 | rth->rt_flags |= RTCF_LOCAL; | |
1701 | } | |
1702 | ||
1703 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1704 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
1da177e4 LT |
1705 | rth->u.dst.input = ip_mr_input; |
1706 | #endif | |
1707 | RT_CACHE_STAT_INC(in_slow_mc); | |
1708 | ||
1709 | in_dev_put(in_dev); | |
8c7bc840 | 1710 | hash = rt_hash(daddr, saddr, dev->ifindex); |
ee6b9673 | 1711 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1712 | |
1713 | e_nobufs: | |
1714 | in_dev_put(in_dev); | |
1715 | return -ENOBUFS; | |
1716 | ||
1717 | e_inval: | |
1718 | in_dev_put(in_dev); | |
1719 | return -EINVAL; | |
1720 | } | |
1721 | ||
1722 | ||
1723 | static void ip_handle_martian_source(struct net_device *dev, | |
1724 | struct in_device *in_dev, | |
1725 | struct sk_buff *skb, | |
9e12bb22 AV |
1726 | __be32 daddr, |
1727 | __be32 saddr) | |
1da177e4 LT |
1728 | { |
1729 | RT_CACHE_STAT_INC(in_martian_src); | |
1730 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1731 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1732 | /* | |
1733 | * RFC1812 recommendation, if source is martian, | |
1734 | * the only hint is MAC header. | |
1735 | */ | |
1736 | printk(KERN_WARNING "martian source %u.%u.%u.%u from " | |
1737 | "%u.%u.%u.%u, on dev %s\n", | |
1738 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
98e399f8 | 1739 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1740 | int i; |
98e399f8 | 1741 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1742 | printk(KERN_WARNING "ll header: "); |
1743 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1744 | printk("%02x", *p); | |
1745 | if (i < (dev->hard_header_len - 1)) | |
1746 | printk(":"); | |
1747 | } | |
1748 | printk("\n"); | |
1749 | } | |
1750 | } | |
1751 | #endif | |
1752 | } | |
1753 | ||
e905a9ed YH |
1754 | static inline int __mkroute_input(struct sk_buff *skb, |
1755 | struct fib_result* res, | |
1756 | struct in_device *in_dev, | |
9e12bb22 | 1757 | __be32 daddr, __be32 saddr, u32 tos, |
e905a9ed | 1758 | struct rtable **result) |
1da177e4 LT |
1759 | { |
1760 | ||
1761 | struct rtable *rth; | |
1762 | int err; | |
1763 | struct in_device *out_dev; | |
1764 | unsigned flags = 0; | |
d9c9df8c AV |
1765 | __be32 spec_dst; |
1766 | u32 itag; | |
1da177e4 LT |
1767 | |
1768 | /* get a working reference to the output device */ | |
1769 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1770 | if (out_dev == NULL) { | |
1771 | if (net_ratelimit()) | |
1772 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1773 | "_slow(). Please, report\n"); | |
1774 | return -EINVAL; | |
1775 | } | |
1776 | ||
1777 | ||
e905a9ed | 1778 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1779 | in_dev->dev, &spec_dst, &itag); |
1780 | if (err < 0) { | |
e905a9ed | 1781 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1782 | saddr); |
e905a9ed | 1783 | |
1da177e4 LT |
1784 | err = -EINVAL; |
1785 | goto cleanup; | |
1786 | } | |
1787 | ||
1788 | if (err) | |
1789 | flags |= RTCF_DIRECTSRC; | |
1790 | ||
cb7928a5 | 1791 | if (out_dev == in_dev && err && !(flags & RTCF_MASQ) && |
1da177e4 LT |
1792 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1793 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1794 | flags |= RTCF_DOREDIRECT; | |
1795 | ||
1796 | if (skb->protocol != htons(ETH_P_IP)) { | |
1797 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1798 | * invalid for proxy arp. DNAT routes are always valid. | |
1799 | */ | |
cb7928a5 | 1800 | if (out_dev == in_dev) { |
1da177e4 LT |
1801 | err = -EINVAL; |
1802 | goto cleanup; | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | ||
1807 | rth = dst_alloc(&ipv4_dst_ops); | |
1808 | if (!rth) { | |
1809 | err = -ENOBUFS; | |
1810 | goto cleanup; | |
1811 | } | |
1812 | ||
ce723d8e | 1813 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1814 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1815 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1816 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1817 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1818 | rth->u.dst.flags |= DST_NOXFRM; |
1819 | rth->fl.fl4_dst = daddr; | |
1820 | rth->rt_dst = daddr; | |
1821 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1822 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1823 | rth->fl.fl4_src = saddr; |
1824 | rth->rt_src = saddr; | |
1825 | rth->rt_gateway = daddr; | |
1826 | rth->rt_iif = | |
1827 | rth->fl.iif = in_dev->dev->ifindex; | |
1828 | rth->u.dst.dev = (out_dev)->dev; | |
1829 | dev_hold(rth->u.dst.dev); | |
1830 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1831 | rth->fl.oif = 0; | |
1832 | rth->rt_spec_dst= spec_dst; | |
1833 | ||
1834 | rth->u.dst.input = ip_forward; | |
1835 | rth->u.dst.output = ip_output; | |
29e75252 | 1836 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1837 | |
1838 | rt_set_nexthop(rth, res, itag); | |
1839 | ||
1840 | rth->rt_flags = flags; | |
1841 | ||
1842 | *result = rth; | |
1843 | err = 0; | |
1844 | cleanup: | |
1845 | /* release the working reference to the output device */ | |
1846 | in_dev_put(out_dev); | |
1847 | return err; | |
e905a9ed | 1848 | } |
1da177e4 | 1849 | |
e06e7c61 DM |
1850 | static inline int ip_mkroute_input(struct sk_buff *skb, |
1851 | struct fib_result* res, | |
1852 | const struct flowi *fl, | |
1853 | struct in_device *in_dev, | |
1854 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1855 | { |
7abaa27c | 1856 | struct rtable* rth = NULL; |
1da177e4 LT |
1857 | int err; |
1858 | unsigned hash; | |
1859 | ||
1860 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1861 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
1862 | fib_select_multipath(fl, res); | |
1863 | #endif | |
1864 | ||
1865 | /* create a routing cache entry */ | |
1866 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1867 | if (err) | |
1868 | return err; | |
1da177e4 LT |
1869 | |
1870 | /* put it into the cache */ | |
8c7bc840 | 1871 | hash = rt_hash(daddr, saddr, fl->iif); |
ee6b9673 | 1872 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1873 | } |
1874 | ||
1da177e4 LT |
1875 | /* |
1876 | * NOTE. We drop all the packets that has local source | |
1877 | * addresses, because every properly looped back packet | |
1878 | * must have correct destination already attached by output routine. | |
1879 | * | |
1880 | * Such approach solves two big problems: | |
1881 | * 1. Not simplex devices are handled properly. | |
1882 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
1883 | */ | |
1884 | ||
9e12bb22 | 1885 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1886 | u8 tos, struct net_device *dev) |
1887 | { | |
1888 | struct fib_result res; | |
1889 | struct in_device *in_dev = in_dev_get(dev); | |
1890 | struct flowi fl = { .nl_u = { .ip4_u = | |
1891 | { .daddr = daddr, | |
1892 | .saddr = saddr, | |
1893 | .tos = tos, | |
1894 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1895 | } }, |
47dcf0cb | 1896 | .mark = skb->mark, |
1da177e4 LT |
1897 | .iif = dev->ifindex }; |
1898 | unsigned flags = 0; | |
1899 | u32 itag = 0; | |
1900 | struct rtable * rth; | |
1901 | unsigned hash; | |
9e12bb22 | 1902 | __be32 spec_dst; |
1da177e4 LT |
1903 | int err = -EINVAL; |
1904 | int free_res = 0; | |
84a885f4 | 1905 | struct net * net = dev->nd_net; |
1da177e4 LT |
1906 | |
1907 | /* IP on this device is disabled. */ | |
1908 | ||
1909 | if (!in_dev) | |
1910 | goto out; | |
1911 | ||
1912 | /* Check for the most weird martians, which can be not detected | |
1913 | by fib_lookup. | |
1914 | */ | |
1915 | ||
1e637c74 | 1916 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1917 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
1918 | goto martian_source; |
1919 | ||
e448515c | 1920 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1921 | goto brd_input; |
1922 | ||
1923 | /* Accept zero addresses only to limited broadcast; | |
1924 | * I even do not know to fix it or not. Waiting for complains :-) | |
1925 | */ | |
f97c1e0c | 1926 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1927 | goto martian_source; |
1928 | ||
1e637c74 | 1929 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
f97c1e0c | 1930 | ipv4_is_loopback(daddr)) |
1da177e4 LT |
1931 | goto martian_destination; |
1932 | ||
1933 | /* | |
1934 | * Now we are ready to route packet. | |
1935 | */ | |
84a885f4 | 1936 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
1da177e4 | 1937 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 1938 | goto e_hostunreach; |
1da177e4 LT |
1939 | goto no_route; |
1940 | } | |
1941 | free_res = 1; | |
1942 | ||
1943 | RT_CACHE_STAT_INC(in_slow_tot); | |
1944 | ||
1945 | if (res.type == RTN_BROADCAST) | |
1946 | goto brd_input; | |
1947 | ||
1948 | if (res.type == RTN_LOCAL) { | |
1949 | int result; | |
1950 | result = fib_validate_source(saddr, daddr, tos, | |
84a885f4 | 1951 | net->loopback_dev->ifindex, |
1da177e4 LT |
1952 | dev, &spec_dst, &itag); |
1953 | if (result < 0) | |
1954 | goto martian_source; | |
1955 | if (result) | |
1956 | flags |= RTCF_DIRECTSRC; | |
1957 | spec_dst = daddr; | |
1958 | goto local_input; | |
1959 | } | |
1960 | ||
1961 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1962 | goto e_hostunreach; |
1da177e4 LT |
1963 | if (res.type != RTN_UNICAST) |
1964 | goto martian_destination; | |
1965 | ||
1966 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1da177e4 LT |
1967 | done: |
1968 | in_dev_put(in_dev); | |
1969 | if (free_res) | |
1970 | fib_res_put(&res); | |
1971 | out: return err; | |
1972 | ||
1973 | brd_input: | |
1974 | if (skb->protocol != htons(ETH_P_IP)) | |
1975 | goto e_inval; | |
1976 | ||
f97c1e0c | 1977 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1978 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
1979 | else { | |
1980 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
1981 | &itag); | |
1982 | if (err < 0) | |
1983 | goto martian_source; | |
1984 | if (err) | |
1985 | flags |= RTCF_DIRECTSRC; | |
1986 | } | |
1987 | flags |= RTCF_BROADCAST; | |
1988 | res.type = RTN_BROADCAST; | |
1989 | RT_CACHE_STAT_INC(in_brd); | |
1990 | ||
1991 | local_input: | |
1992 | rth = dst_alloc(&ipv4_dst_ops); | |
1993 | if (!rth) | |
1994 | goto e_nobufs; | |
1995 | ||
1996 | rth->u.dst.output= ip_rt_bug; | |
29e75252 | 1997 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1998 | |
1999 | atomic_set(&rth->u.dst.__refcnt, 1); | |
2000 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 2001 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2002 | rth->u.dst.flags |= DST_NOPOLICY; |
2003 | rth->fl.fl4_dst = daddr; | |
2004 | rth->rt_dst = daddr; | |
2005 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 2006 | rth->fl.mark = skb->mark; |
1da177e4 LT |
2007 | rth->fl.fl4_src = saddr; |
2008 | rth->rt_src = saddr; | |
2009 | #ifdef CONFIG_NET_CLS_ROUTE | |
2010 | rth->u.dst.tclassid = itag; | |
2011 | #endif | |
2012 | rth->rt_iif = | |
2013 | rth->fl.iif = dev->ifindex; | |
84a885f4 | 2014 | rth->u.dst.dev = net->loopback_dev; |
1da177e4 LT |
2015 | dev_hold(rth->u.dst.dev); |
2016 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2017 | rth->rt_gateway = daddr; | |
2018 | rth->rt_spec_dst= spec_dst; | |
2019 | rth->u.dst.input= ip_local_deliver; | |
2020 | rth->rt_flags = flags|RTCF_LOCAL; | |
2021 | if (res.type == RTN_UNREACHABLE) { | |
2022 | rth->u.dst.input= ip_error; | |
2023 | rth->u.dst.error= -err; | |
2024 | rth->rt_flags &= ~RTCF_LOCAL; | |
2025 | } | |
2026 | rth->rt_type = res.type; | |
8c7bc840 | 2027 | hash = rt_hash(daddr, saddr, fl.iif); |
ee6b9673 | 2028 | err = rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2029 | goto done; |
2030 | ||
2031 | no_route: | |
2032 | RT_CACHE_STAT_INC(in_no_route); | |
2033 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2034 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2035 | if (err == -ESRCH) |
2036 | err = -ENETUNREACH; | |
1da177e4 LT |
2037 | goto local_input; |
2038 | ||
2039 | /* | |
2040 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2041 | */ | |
2042 | martian_destination: | |
2043 | RT_CACHE_STAT_INC(in_martian_dst); | |
2044 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2045 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
2046 | printk(KERN_WARNING "martian destination %u.%u.%u.%u from " | |
2047 | "%u.%u.%u.%u, dev %s\n", | |
2048 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
2049 | #endif | |
2c2910a4 DE |
2050 | |
2051 | e_hostunreach: | |
e905a9ed YH |
2052 | err = -EHOSTUNREACH; |
2053 | goto done; | |
2c2910a4 | 2054 | |
1da177e4 LT |
2055 | e_inval: |
2056 | err = -EINVAL; | |
2057 | goto done; | |
2058 | ||
2059 | e_nobufs: | |
2060 | err = -ENOBUFS; | |
2061 | goto done; | |
2062 | ||
2063 | martian_source: | |
2064 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2065 | goto e_inval; | |
2066 | } | |
2067 | ||
9e12bb22 | 2068 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2069 | u8 tos, struct net_device *dev) |
2070 | { | |
2071 | struct rtable * rth; | |
2072 | unsigned hash; | |
2073 | int iif = dev->ifindex; | |
b5921910 | 2074 | struct net *net; |
1da177e4 | 2075 | |
4136cd52 | 2076 | net = dev->nd_net; |
1da177e4 | 2077 | tos &= IPTOS_RT_MASK; |
8c7bc840 | 2078 | hash = rt_hash(daddr, saddr, iif); |
1da177e4 LT |
2079 | |
2080 | rcu_read_lock(); | |
2081 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2082 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2083 | if (rth->fl.fl4_dst == daddr && |
2084 | rth->fl.fl4_src == saddr && | |
2085 | rth->fl.iif == iif && | |
2086 | rth->fl.oif == 0 && | |
47dcf0cb | 2087 | rth->fl.mark == skb->mark && |
b5921910 | 2088 | rth->fl.fl4_tos == tos && |
29e75252 ED |
2089 | rth->u.dst.dev->nd_net == net && |
2090 | rth->rt_genid == atomic_read(&rt_genid)) { | |
03f49f34 | 2091 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2092 | RT_CACHE_STAT_INC(in_hit); |
2093 | rcu_read_unlock(); | |
ee6b9673 | 2094 | skb->rtable = rth; |
1da177e4 LT |
2095 | return 0; |
2096 | } | |
2097 | RT_CACHE_STAT_INC(in_hlist_search); | |
2098 | } | |
2099 | rcu_read_unlock(); | |
2100 | ||
2101 | /* Multicast recognition logic is moved from route cache to here. | |
2102 | The problem was that too many Ethernet cards have broken/missing | |
2103 | hardware multicast filters :-( As result the host on multicasting | |
2104 | network acquires a lot of useless route cache entries, sort of | |
2105 | SDR messages from all the world. Now we try to get rid of them. | |
2106 | Really, provided software IP multicast filter is organized | |
2107 | reasonably (at least, hashed), it does not result in a slowdown | |
2108 | comparing with route cache reject entries. | |
2109 | Note, that multicast routers are not affected, because | |
2110 | route cache entry is created eventually. | |
2111 | */ | |
f97c1e0c | 2112 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
2113 | struct in_device *in_dev; |
2114 | ||
2115 | rcu_read_lock(); | |
e5ed6399 | 2116 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 2117 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 2118 | ip_hdr(skb)->protocol); |
1da177e4 LT |
2119 | if (our |
2120 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c JP |
2121 | || (!ipv4_is_local_multicast(daddr) && |
2122 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 LT |
2123 | #endif |
2124 | ) { | |
2125 | rcu_read_unlock(); | |
2126 | return ip_route_input_mc(skb, daddr, saddr, | |
2127 | tos, dev, our); | |
2128 | } | |
2129 | } | |
2130 | rcu_read_unlock(); | |
2131 | return -EINVAL; | |
2132 | } | |
2133 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2134 | } | |
2135 | ||
2136 | static inline int __mkroute_output(struct rtable **result, | |
e905a9ed | 2137 | struct fib_result* res, |
1da177e4 | 2138 | const struct flowi *fl, |
e905a9ed YH |
2139 | const struct flowi *oldflp, |
2140 | struct net_device *dev_out, | |
2141 | unsigned flags) | |
1da177e4 LT |
2142 | { |
2143 | struct rtable *rth; | |
2144 | struct in_device *in_dev; | |
2145 | u32 tos = RT_FL_TOS(oldflp); | |
2146 | int err = 0; | |
2147 | ||
f97c1e0c | 2148 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
1da177e4 LT |
2149 | return -EINVAL; |
2150 | ||
e448515c | 2151 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 | 2152 | res->type = RTN_BROADCAST; |
f97c1e0c | 2153 | else if (ipv4_is_multicast(fl->fl4_dst)) |
1da177e4 | 2154 | res->type = RTN_MULTICAST; |
1e637c74 | 2155 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
1da177e4 LT |
2156 | return -EINVAL; |
2157 | ||
2158 | if (dev_out->flags & IFF_LOOPBACK) | |
2159 | flags |= RTCF_LOCAL; | |
2160 | ||
2161 | /* get work reference to inet device */ | |
2162 | in_dev = in_dev_get(dev_out); | |
2163 | if (!in_dev) | |
2164 | return -EINVAL; | |
2165 | ||
2166 | if (res->type == RTN_BROADCAST) { | |
2167 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2168 | if (res->fi) { | |
2169 | fib_info_put(res->fi); | |
2170 | res->fi = NULL; | |
2171 | } | |
2172 | } else if (res->type == RTN_MULTICAST) { | |
2173 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2174 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2175 | oldflp->proto)) |
2176 | flags &= ~RTCF_LOCAL; | |
2177 | /* If multicast route do not exist use | |
2178 | default one, but do not gateway in this case. | |
2179 | Yes, it is hack. | |
2180 | */ | |
2181 | if (res->fi && res->prefixlen < 4) { | |
2182 | fib_info_put(res->fi); | |
2183 | res->fi = NULL; | |
2184 | } | |
2185 | } | |
2186 | ||
2187 | ||
2188 | rth = dst_alloc(&ipv4_dst_ops); | |
2189 | if (!rth) { | |
2190 | err = -ENOBUFS; | |
2191 | goto cleanup; | |
e905a9ed | 2192 | } |
1da177e4 | 2193 | |
ce723d8e | 2194 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2195 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2196 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2197 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2198 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2199 | rth->u.dst.flags |= DST_NOPOLICY; |
2200 | ||
2201 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2202 | rth->fl.fl4_tos = tos; | |
2203 | rth->fl.fl4_src = oldflp->fl4_src; | |
2204 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2205 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2206 | rth->rt_dst = fl->fl4_dst; |
2207 | rth->rt_src = fl->fl4_src; | |
2208 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2209 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2210 | cache entry */ |
2211 | rth->u.dst.dev = dev_out; | |
2212 | dev_hold(dev_out); | |
2213 | rth->idev = in_dev_get(dev_out); | |
2214 | rth->rt_gateway = fl->fl4_dst; | |
2215 | rth->rt_spec_dst= fl->fl4_src; | |
2216 | ||
2217 | rth->u.dst.output=ip_output; | |
29e75252 | 2218 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
2219 | |
2220 | RT_CACHE_STAT_INC(out_slow_tot); | |
2221 | ||
2222 | if (flags & RTCF_LOCAL) { | |
2223 | rth->u.dst.input = ip_local_deliver; | |
2224 | rth->rt_spec_dst = fl->fl4_dst; | |
2225 | } | |
2226 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2227 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2228 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2229 | !(dev_out->flags & IFF_LOOPBACK)) { |
2230 | rth->u.dst.output = ip_mc_output; | |
2231 | RT_CACHE_STAT_INC(out_slow_mc); | |
2232 | } | |
2233 | #ifdef CONFIG_IP_MROUTE | |
2234 | if (res->type == RTN_MULTICAST) { | |
2235 | if (IN_DEV_MFORWARD(in_dev) && | |
f97c1e0c | 2236 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
1da177e4 LT |
2237 | rth->u.dst.input = ip_mr_input; |
2238 | rth->u.dst.output = ip_mc_output; | |
2239 | } | |
2240 | } | |
2241 | #endif | |
2242 | } | |
2243 | ||
2244 | rt_set_nexthop(rth, res, 0); | |
2245 | ||
2246 | rth->rt_flags = flags; | |
2247 | ||
2248 | *result = rth; | |
2249 | cleanup: | |
2250 | /* release work reference to inet device */ | |
2251 | in_dev_put(in_dev); | |
2252 | ||
2253 | return err; | |
2254 | } | |
2255 | ||
e06e7c61 DM |
2256 | static inline int ip_mkroute_output(struct rtable **rp, |
2257 | struct fib_result* res, | |
2258 | const struct flowi *fl, | |
2259 | const struct flowi *oldflp, | |
2260 | struct net_device *dev_out, | |
2261 | unsigned flags) | |
1da177e4 | 2262 | { |
7abaa27c | 2263 | struct rtable *rth = NULL; |
1da177e4 LT |
2264 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2265 | unsigned hash; | |
2266 | if (err == 0) { | |
8c7bc840 | 2267 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif); |
1da177e4 LT |
2268 | err = rt_intern_hash(hash, rth, rp); |
2269 | } | |
e905a9ed | 2270 | |
1da177e4 LT |
2271 | return err; |
2272 | } | |
2273 | ||
1da177e4 LT |
2274 | /* |
2275 | * Major route resolver routine. | |
2276 | */ | |
2277 | ||
b40afd0e DL |
2278 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
2279 | const struct flowi *oldflp) | |
1da177e4 LT |
2280 | { |
2281 | u32 tos = RT_FL_TOS(oldflp); | |
2282 | struct flowi fl = { .nl_u = { .ip4_u = | |
2283 | { .daddr = oldflp->fl4_dst, | |
2284 | .saddr = oldflp->fl4_src, | |
2285 | .tos = tos & IPTOS_RT_MASK, | |
2286 | .scope = ((tos & RTO_ONLINK) ? | |
2287 | RT_SCOPE_LINK : | |
2288 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2289 | } }, |
47dcf0cb | 2290 | .mark = oldflp->mark, |
b40afd0e | 2291 | .iif = net->loopback_dev->ifindex, |
1da177e4 LT |
2292 | .oif = oldflp->oif }; |
2293 | struct fib_result res; | |
2294 | unsigned flags = 0; | |
2295 | struct net_device *dev_out = NULL; | |
2296 | int free_res = 0; | |
2297 | int err; | |
2298 | ||
2299 | ||
2300 | res.fi = NULL; | |
2301 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2302 | res.r = NULL; | |
2303 | #endif | |
2304 | ||
2305 | if (oldflp->fl4_src) { | |
2306 | err = -EINVAL; | |
f97c1e0c | 2307 | if (ipv4_is_multicast(oldflp->fl4_src) || |
1e637c74 | 2308 | ipv4_is_lbcast(oldflp->fl4_src) || |
f97c1e0c | 2309 | ipv4_is_zeronet(oldflp->fl4_src)) |
1da177e4 LT |
2310 | goto out; |
2311 | ||
2312 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
b40afd0e | 2313 | dev_out = ip_dev_find(net, oldflp->fl4_src); |
f6c5d736 | 2314 | if (dev_out == NULL) |
1da177e4 LT |
2315 | goto out; |
2316 | ||
2317 | /* I removed check for oif == dev_out->oif here. | |
2318 | It was wrong for two reasons: | |
1ab35276 DL |
2319 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2320 | is assigned to multiple interfaces. | |
1da177e4 LT |
2321 | 2. Moreover, we are allowed to send packets with saddr |
2322 | of another iface. --ANK | |
2323 | */ | |
2324 | ||
f6c5d736 | 2325 | if (oldflp->oif == 0 |
f97c1e0c JP |
2326 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
2327 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { | |
1da177e4 LT |
2328 | /* Special hack: user can direct multicasts |
2329 | and limited broadcast via necessary interface | |
2330 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2331 | This hack is not just for fun, it allows | |
2332 | vic,vat and friends to work. | |
2333 | They bind socket to loopback, set ttl to zero | |
2334 | and expect that it will work. | |
2335 | From the viewpoint of routing cache they are broken, | |
2336 | because we are not allowed to build multicast path | |
2337 | with loopback source addr (look, routing cache | |
2338 | cannot know, that ttl is zero, so that packet | |
2339 | will not leave this host and route is valid). | |
2340 | Luckily, this hack is good workaround. | |
2341 | */ | |
2342 | ||
2343 | fl.oif = dev_out->ifindex; | |
2344 | goto make_route; | |
2345 | } | |
2346 | if (dev_out) | |
2347 | dev_put(dev_out); | |
2348 | dev_out = NULL; | |
2349 | } | |
2350 | ||
2351 | ||
2352 | if (oldflp->oif) { | |
b40afd0e | 2353 | dev_out = dev_get_by_index(net, oldflp->oif); |
1da177e4 LT |
2354 | err = -ENODEV; |
2355 | if (dev_out == NULL) | |
2356 | goto out; | |
e5ed6399 HX |
2357 | |
2358 | /* RACE: Check return value of inet_select_addr instead. */ | |
2359 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2360 | dev_put(dev_out); |
2361 | goto out; /* Wrong error code */ | |
2362 | } | |
2363 | ||
f97c1e0c JP |
2364 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
2365 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { | |
1da177e4 LT |
2366 | if (!fl.fl4_src) |
2367 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2368 | RT_SCOPE_LINK); | |
2369 | goto make_route; | |
2370 | } | |
2371 | if (!fl.fl4_src) { | |
f97c1e0c | 2372 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
1da177e4 LT |
2373 | fl.fl4_src = inet_select_addr(dev_out, 0, |
2374 | fl.fl4_scope); | |
2375 | else if (!oldflp->fl4_dst) | |
2376 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2377 | RT_SCOPE_HOST); | |
2378 | } | |
2379 | } | |
2380 | ||
2381 | if (!fl.fl4_dst) { | |
2382 | fl.fl4_dst = fl.fl4_src; | |
2383 | if (!fl.fl4_dst) | |
2384 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2385 | if (dev_out) | |
2386 | dev_put(dev_out); | |
b40afd0e | 2387 | dev_out = net->loopback_dev; |
1da177e4 | 2388 | dev_hold(dev_out); |
b40afd0e | 2389 | fl.oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2390 | res.type = RTN_LOCAL; |
2391 | flags |= RTCF_LOCAL; | |
2392 | goto make_route; | |
2393 | } | |
2394 | ||
b40afd0e | 2395 | if (fib_lookup(net, &fl, &res)) { |
1da177e4 LT |
2396 | res.fi = NULL; |
2397 | if (oldflp->oif) { | |
2398 | /* Apparently, routing tables are wrong. Assume, | |
2399 | that the destination is on link. | |
2400 | ||
2401 | WHY? DW. | |
2402 | Because we are allowed to send to iface | |
2403 | even if it has NO routes and NO assigned | |
2404 | addresses. When oif is specified, routing | |
2405 | tables are looked up with only one purpose: | |
2406 | to catch if destination is gatewayed, rather than | |
2407 | direct. Moreover, if MSG_DONTROUTE is set, | |
2408 | we send packet, ignoring both routing tables | |
2409 | and ifaddr state. --ANK | |
2410 | ||
2411 | ||
2412 | We could make it even if oif is unknown, | |
2413 | likely IPv6, but we do not. | |
2414 | */ | |
2415 | ||
2416 | if (fl.fl4_src == 0) | |
2417 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2418 | RT_SCOPE_LINK); | |
2419 | res.type = RTN_UNICAST; | |
2420 | goto make_route; | |
2421 | } | |
2422 | if (dev_out) | |
2423 | dev_put(dev_out); | |
2424 | err = -ENETUNREACH; | |
2425 | goto out; | |
2426 | } | |
2427 | free_res = 1; | |
2428 | ||
2429 | if (res.type == RTN_LOCAL) { | |
2430 | if (!fl.fl4_src) | |
2431 | fl.fl4_src = fl.fl4_dst; | |
2432 | if (dev_out) | |
2433 | dev_put(dev_out); | |
b40afd0e | 2434 | dev_out = net->loopback_dev; |
1da177e4 LT |
2435 | dev_hold(dev_out); |
2436 | fl.oif = dev_out->ifindex; | |
2437 | if (res.fi) | |
2438 | fib_info_put(res.fi); | |
2439 | res.fi = NULL; | |
2440 | flags |= RTCF_LOCAL; | |
2441 | goto make_route; | |
2442 | } | |
2443 | ||
2444 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2445 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2446 | fib_select_multipath(&fl, &res); | |
2447 | else | |
2448 | #endif | |
2449 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
b40afd0e | 2450 | fib_select_default(net, &fl, &res); |
1da177e4 LT |
2451 | |
2452 | if (!fl.fl4_src) | |
2453 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2454 | ||
2455 | if (dev_out) | |
2456 | dev_put(dev_out); | |
2457 | dev_out = FIB_RES_DEV(res); | |
2458 | dev_hold(dev_out); | |
2459 | fl.oif = dev_out->ifindex; | |
2460 | ||
2461 | ||
2462 | make_route: | |
2463 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2464 | ||
2465 | ||
2466 | if (free_res) | |
2467 | fib_res_put(&res); | |
2468 | if (dev_out) | |
2469 | dev_put(dev_out); | |
2470 | out: return err; | |
2471 | } | |
2472 | ||
611c183e DL |
2473 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
2474 | const struct flowi *flp) | |
1da177e4 LT |
2475 | { |
2476 | unsigned hash; | |
2477 | struct rtable *rth; | |
2478 | ||
8c7bc840 | 2479 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif); |
1da177e4 LT |
2480 | |
2481 | rcu_read_lock_bh(); | |
2482 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2483 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2484 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2485 | rth->fl.fl4_src == flp->fl4_src && | |
2486 | rth->fl.iif == 0 && | |
2487 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2488 | rth->fl.mark == flp->mark && |
1da177e4 | 2489 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
b5921910 | 2490 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
29e75252 ED |
2491 | rth->u.dst.dev->nd_net == net && |
2492 | rth->rt_genid == atomic_read(&rt_genid)) { | |
03f49f34 | 2493 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2494 | RT_CACHE_STAT_INC(out_hit); |
2495 | rcu_read_unlock_bh(); | |
2496 | *rp = rth; | |
2497 | return 0; | |
2498 | } | |
2499 | RT_CACHE_STAT_INC(out_hlist_search); | |
2500 | } | |
2501 | rcu_read_unlock_bh(); | |
2502 | ||
611c183e | 2503 | return ip_route_output_slow(net, rp, flp); |
1da177e4 LT |
2504 | } |
2505 | ||
d8c97a94 ACM |
2506 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2507 | ||
14e50e57 DM |
2508 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2509 | { | |
2510 | } | |
2511 | ||
2512 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2513 | .family = AF_INET, | |
2514 | .protocol = __constant_htons(ETH_P_IP), | |
2515 | .destroy = ipv4_dst_destroy, | |
2516 | .check = ipv4_dst_check, | |
2517 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
2518 | .entry_size = sizeof(struct rtable), | |
e2422970 | 2519 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
2520 | }; |
2521 | ||
2522 | ||
ce259990 | 2523 | static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp) |
14e50e57 DM |
2524 | { |
2525 | struct rtable *ort = *rp; | |
2526 | struct rtable *rt = (struct rtable *) | |
2527 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2528 | ||
2529 | if (rt) { | |
2530 | struct dst_entry *new = &rt->u.dst; | |
2531 | ||
2532 | atomic_set(&new->__refcnt, 1); | |
2533 | new->__use = 1; | |
352e512c HX |
2534 | new->input = dst_discard; |
2535 | new->output = dst_discard; | |
14e50e57 DM |
2536 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
2537 | ||
2538 | new->dev = ort->u.dst.dev; | |
2539 | if (new->dev) | |
2540 | dev_hold(new->dev); | |
2541 | ||
2542 | rt->fl = ort->fl; | |
2543 | ||
2544 | rt->idev = ort->idev; | |
2545 | if (rt->idev) | |
2546 | in_dev_hold(rt->idev); | |
29e75252 | 2547 | rt->rt_genid = atomic_read(&rt_genid); |
14e50e57 DM |
2548 | rt->rt_flags = ort->rt_flags; |
2549 | rt->rt_type = ort->rt_type; | |
2550 | rt->rt_dst = ort->rt_dst; | |
2551 | rt->rt_src = ort->rt_src; | |
2552 | rt->rt_iif = ort->rt_iif; | |
2553 | rt->rt_gateway = ort->rt_gateway; | |
2554 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2555 | rt->peer = ort->peer; | |
2556 | if (rt->peer) | |
2557 | atomic_inc(&rt->peer->refcnt); | |
2558 | ||
2559 | dst_free(new); | |
2560 | } | |
2561 | ||
2562 | dst_release(&(*rp)->u.dst); | |
2563 | *rp = rt; | |
2564 | return (rt ? 0 : -ENOMEM); | |
2565 | } | |
2566 | ||
f1b050bf DL |
2567 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
2568 | struct sock *sk, int flags) | |
1da177e4 LT |
2569 | { |
2570 | int err; | |
2571 | ||
f1b050bf | 2572 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
1da177e4 LT |
2573 | return err; |
2574 | ||
2575 | if (flp->proto) { | |
2576 | if (!flp->fl4_src) | |
2577 | flp->fl4_src = (*rp)->rt_src; | |
2578 | if (!flp->fl4_dst) | |
2579 | flp->fl4_dst = (*rp)->rt_dst; | |
bb72845e HX |
2580 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, |
2581 | flags ? XFRM_LOOKUP_WAIT : 0); | |
14e50e57 | 2582 | if (err == -EREMOTE) |
ce259990 | 2583 | err = ipv4_dst_blackhole(rp, flp); |
14e50e57 DM |
2584 | |
2585 | return err; | |
1da177e4 LT |
2586 | } |
2587 | ||
2588 | return 0; | |
2589 | } | |
2590 | ||
d8c97a94 ACM |
2591 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2592 | ||
f206351a | 2593 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
1da177e4 | 2594 | { |
f206351a | 2595 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
1da177e4 LT |
2596 | } |
2597 | ||
2598 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2599 | int nowait, unsigned int flags) |
1da177e4 | 2600 | { |
ee6b9673 | 2601 | struct rtable *rt = skb->rtable; |
1da177e4 | 2602 | struct rtmsg *r; |
be403ea1 | 2603 | struct nlmsghdr *nlh; |
e3703b3d TG |
2604 | long expires; |
2605 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2606 | |
2607 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2608 | if (nlh == NULL) | |
26932566 | 2609 | return -EMSGSIZE; |
be403ea1 TG |
2610 | |
2611 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2612 | r->rtm_family = AF_INET; |
2613 | r->rtm_dst_len = 32; | |
2614 | r->rtm_src_len = 0; | |
2615 | r->rtm_tos = rt->fl.fl4_tos; | |
2616 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2617 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2618 | r->rtm_type = rt->rt_type; |
2619 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2620 | r->rtm_protocol = RTPROT_UNSPEC; | |
2621 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2622 | if (rt->rt_flags & RTCF_NOTIFY) | |
2623 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2624 | |
17fb2c64 | 2625 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2626 | |
1da177e4 LT |
2627 | if (rt->fl.fl4_src) { |
2628 | r->rtm_src_len = 32; | |
17fb2c64 | 2629 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2630 | } |
2631 | if (rt->u.dst.dev) | |
be403ea1 | 2632 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2633 | #ifdef CONFIG_NET_CLS_ROUTE |
2634 | if (rt->u.dst.tclassid) | |
be403ea1 | 2635 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2636 | #endif |
2637 | if (rt->fl.iif) | |
17fb2c64 | 2638 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2639 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2640 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2641 | |
1da177e4 | 2642 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2643 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2644 | |
1da177e4 | 2645 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2646 | goto nla_put_failure; |
2647 | ||
e3703b3d TG |
2648 | error = rt->u.dst.error; |
2649 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2650 | if (rt->peer) { |
e3703b3d | 2651 | id = rt->peer->ip_id_count; |
1da177e4 | 2652 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2653 | ts = rt->peer->tcp_ts; |
9d729f72 | 2654 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2655 | } |
2656 | } | |
be403ea1 | 2657 | |
1da177e4 LT |
2658 | if (rt->fl.iif) { |
2659 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2660 | __be32 dst = rt->rt_dst; |
1da177e4 | 2661 | |
f97c1e0c | 2662 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
586f1211 | 2663 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
1da177e4 LT |
2664 | int err = ipmr_get_route(skb, r, nowait); |
2665 | if (err <= 0) { | |
2666 | if (!nowait) { | |
2667 | if (err == 0) | |
2668 | return 0; | |
be403ea1 | 2669 | goto nla_put_failure; |
1da177e4 LT |
2670 | } else { |
2671 | if (err == -EMSGSIZE) | |
be403ea1 | 2672 | goto nla_put_failure; |
e3703b3d | 2673 | error = err; |
1da177e4 LT |
2674 | } |
2675 | } | |
2676 | } else | |
2677 | #endif | |
be403ea1 | 2678 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2679 | } |
2680 | ||
e3703b3d TG |
2681 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2682 | expires, error) < 0) | |
2683 | goto nla_put_failure; | |
be403ea1 TG |
2684 | |
2685 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2686 | |
be403ea1 | 2687 | nla_put_failure: |
26932566 PM |
2688 | nlmsg_cancel(skb, nlh); |
2689 | return -EMSGSIZE; | |
1da177e4 LT |
2690 | } |
2691 | ||
63f3444f | 2692 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2693 | { |
b854272b | 2694 | struct net *net = in_skb->sk->sk_net; |
d889ce3b TG |
2695 | struct rtmsg *rtm; |
2696 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2697 | struct rtable *rt = NULL; |
9e12bb22 AV |
2698 | __be32 dst = 0; |
2699 | __be32 src = 0; | |
2700 | u32 iif; | |
d889ce3b | 2701 | int err; |
1da177e4 LT |
2702 | struct sk_buff *skb; |
2703 | ||
d889ce3b TG |
2704 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2705 | if (err < 0) | |
2706 | goto errout; | |
2707 | ||
2708 | rtm = nlmsg_data(nlh); | |
2709 | ||
1da177e4 | 2710 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2711 | if (skb == NULL) { |
2712 | err = -ENOBUFS; | |
2713 | goto errout; | |
2714 | } | |
1da177e4 LT |
2715 | |
2716 | /* Reserve room for dummy headers, this skb can pass | |
2717 | through good chunk of routing engine. | |
2718 | */ | |
459a98ed | 2719 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2720 | skb_reset_network_header(skb); |
d2c962b8 SH |
2721 | |
2722 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2723 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2724 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2725 | ||
17fb2c64 AV |
2726 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2727 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2728 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2729 | |
2730 | if (iif) { | |
d889ce3b TG |
2731 | struct net_device *dev; |
2732 | ||
1937504d | 2733 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2734 | if (dev == NULL) { |
2735 | err = -ENODEV; | |
2736 | goto errout_free; | |
2737 | } | |
2738 | ||
1da177e4 LT |
2739 | skb->protocol = htons(ETH_P_IP); |
2740 | skb->dev = dev; | |
2741 | local_bh_disable(); | |
2742 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2743 | local_bh_enable(); | |
d889ce3b | 2744 | |
ee6b9673 | 2745 | rt = skb->rtable; |
d889ce3b | 2746 | if (err == 0 && rt->u.dst.error) |
1da177e4 LT |
2747 | err = -rt->u.dst.error; |
2748 | } else { | |
d889ce3b TG |
2749 | struct flowi fl = { |
2750 | .nl_u = { | |
2751 | .ip4_u = { | |
2752 | .daddr = dst, | |
2753 | .saddr = src, | |
2754 | .tos = rtm->rtm_tos, | |
2755 | }, | |
2756 | }, | |
2757 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2758 | }; | |
1937504d | 2759 | err = ip_route_output_key(net, &rt, &fl); |
1da177e4 | 2760 | } |
d889ce3b | 2761 | |
1da177e4 | 2762 | if (err) |
d889ce3b | 2763 | goto errout_free; |
1da177e4 | 2764 | |
ee6b9673 | 2765 | skb->rtable = rt; |
1da177e4 LT |
2766 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2767 | rt->rt_flags |= RTCF_NOTIFY; | |
2768 | ||
1da177e4 | 2769 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2770 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2771 | if (err <= 0) |
2772 | goto errout_free; | |
1da177e4 | 2773 | |
1937504d | 2774 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2775 | errout: |
2942e900 | 2776 | return err; |
1da177e4 | 2777 | |
d889ce3b | 2778 | errout_free: |
1da177e4 | 2779 | kfree_skb(skb); |
d889ce3b | 2780 | goto errout; |
1da177e4 LT |
2781 | } |
2782 | ||
2783 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2784 | { | |
2785 | struct rtable *rt; | |
2786 | int h, s_h; | |
2787 | int idx, s_idx; | |
1937504d DL |
2788 | struct net *net; |
2789 | ||
2790 | net = skb->sk->sk_net; | |
1da177e4 LT |
2791 | |
2792 | s_h = cb->args[0]; | |
d8c92830 ED |
2793 | if (s_h < 0) |
2794 | s_h = 0; | |
1da177e4 | 2795 | s_idx = idx = cb->args[1]; |
d8c92830 | 2796 | for (h = s_h; h <= rt_hash_mask; h++) { |
1da177e4 LT |
2797 | rcu_read_lock_bh(); |
2798 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2799 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
1937504d | 2800 | if (rt->u.dst.dev->nd_net != net || idx < s_idx) |
1da177e4 | 2801 | continue; |
29e75252 ED |
2802 | if (rt->rt_genid != atomic_read(&rt_genid)) |
2803 | continue; | |
1da177e4 LT |
2804 | skb->dst = dst_clone(&rt->u.dst); |
2805 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 2806 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2807 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
2808 | dst_release(xchg(&skb->dst, NULL)); |
2809 | rcu_read_unlock_bh(); | |
2810 | goto done; | |
2811 | } | |
2812 | dst_release(xchg(&skb->dst, NULL)); | |
2813 | } | |
2814 | rcu_read_unlock_bh(); | |
d8c92830 | 2815 | s_idx = 0; |
1da177e4 LT |
2816 | } |
2817 | ||
2818 | done: | |
2819 | cb->args[0] = h; | |
2820 | cb->args[1] = idx; | |
2821 | return skb->len; | |
2822 | } | |
2823 | ||
2824 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2825 | { | |
2826 | rt_cache_flush(0); | |
2827 | } | |
2828 | ||
2829 | #ifdef CONFIG_SYSCTL | |
2830 | static int flush_delay; | |
2831 | ||
2832 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, | |
2833 | struct file *filp, void __user *buffer, | |
2834 | size_t *lenp, loff_t *ppos) | |
2835 | { | |
2836 | if (write) { | |
2837 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2838 | rt_cache_flush(flush_delay); | |
2839 | return 0; | |
e905a9ed | 2840 | } |
1da177e4 LT |
2841 | |
2842 | return -EINVAL; | |
2843 | } | |
2844 | ||
2845 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
2846 | int __user *name, | |
2847 | int nlen, | |
2848 | void __user *oldval, | |
2849 | size_t __user *oldlenp, | |
2850 | void __user *newval, | |
1f29bcd7 | 2851 | size_t newlen) |
1da177e4 LT |
2852 | { |
2853 | int delay; | |
2854 | if (newlen != sizeof(int)) | |
2855 | return -EINVAL; | |
2856 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed YH |
2857 | return -EFAULT; |
2858 | rt_cache_flush(delay); | |
1da177e4 LT |
2859 | return 0; |
2860 | } | |
2861 | ||
2862 | ctl_table ipv4_route_table[] = { | |
e905a9ed | 2863 | { |
1da177e4 LT |
2864 | .ctl_name = NET_IPV4_ROUTE_FLUSH, |
2865 | .procname = "flush", | |
2866 | .data = &flush_delay, | |
2867 | .maxlen = sizeof(int), | |
7e3e0360 | 2868 | .mode = 0200, |
1da177e4 LT |
2869 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
2870 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
2871 | }, | |
1da177e4 LT |
2872 | { |
2873 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
2874 | .procname = "gc_thresh", | |
2875 | .data = &ipv4_dst_ops.gc_thresh, | |
2876 | .maxlen = sizeof(int), | |
2877 | .mode = 0644, | |
2878 | .proc_handler = &proc_dointvec, | |
2879 | }, | |
2880 | { | |
2881 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
2882 | .procname = "max_size", | |
2883 | .data = &ip_rt_max_size, | |
2884 | .maxlen = sizeof(int), | |
2885 | .mode = 0644, | |
2886 | .proc_handler = &proc_dointvec, | |
2887 | }, | |
2888 | { | |
2889 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2890 | |
1da177e4 LT |
2891 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
2892 | .procname = "gc_min_interval", | |
2893 | .data = &ip_rt_gc_min_interval, | |
2894 | .maxlen = sizeof(int), | |
2895 | .mode = 0644, | |
2896 | .proc_handler = &proc_dointvec_jiffies, | |
2897 | .strategy = &sysctl_jiffies, | |
2898 | }, | |
2899 | { | |
2900 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
2901 | .procname = "gc_min_interval_ms", | |
2902 | .data = &ip_rt_gc_min_interval, | |
2903 | .maxlen = sizeof(int), | |
2904 | .mode = 0644, | |
2905 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2906 | .strategy = &sysctl_ms_jiffies, | |
2907 | }, | |
2908 | { | |
2909 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
2910 | .procname = "gc_timeout", | |
2911 | .data = &ip_rt_gc_timeout, | |
2912 | .maxlen = sizeof(int), | |
2913 | .mode = 0644, | |
2914 | .proc_handler = &proc_dointvec_jiffies, | |
2915 | .strategy = &sysctl_jiffies, | |
2916 | }, | |
2917 | { | |
2918 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
2919 | .procname = "gc_interval", | |
2920 | .data = &ip_rt_gc_interval, | |
2921 | .maxlen = sizeof(int), | |
2922 | .mode = 0644, | |
2923 | .proc_handler = &proc_dointvec_jiffies, | |
2924 | .strategy = &sysctl_jiffies, | |
2925 | }, | |
2926 | { | |
2927 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
2928 | .procname = "redirect_load", | |
2929 | .data = &ip_rt_redirect_load, | |
2930 | .maxlen = sizeof(int), | |
2931 | .mode = 0644, | |
2932 | .proc_handler = &proc_dointvec, | |
2933 | }, | |
2934 | { | |
2935 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
2936 | .procname = "redirect_number", | |
2937 | .data = &ip_rt_redirect_number, | |
2938 | .maxlen = sizeof(int), | |
2939 | .mode = 0644, | |
2940 | .proc_handler = &proc_dointvec, | |
2941 | }, | |
2942 | { | |
2943 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
2944 | .procname = "redirect_silence", | |
2945 | .data = &ip_rt_redirect_silence, | |
2946 | .maxlen = sizeof(int), | |
2947 | .mode = 0644, | |
2948 | .proc_handler = &proc_dointvec, | |
2949 | }, | |
2950 | { | |
2951 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
2952 | .procname = "error_cost", | |
2953 | .data = &ip_rt_error_cost, | |
2954 | .maxlen = sizeof(int), | |
2955 | .mode = 0644, | |
2956 | .proc_handler = &proc_dointvec, | |
2957 | }, | |
2958 | { | |
2959 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
2960 | .procname = "error_burst", | |
2961 | .data = &ip_rt_error_burst, | |
2962 | .maxlen = sizeof(int), | |
2963 | .mode = 0644, | |
2964 | .proc_handler = &proc_dointvec, | |
2965 | }, | |
2966 | { | |
2967 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
2968 | .procname = "gc_elasticity", | |
2969 | .data = &ip_rt_gc_elasticity, | |
2970 | .maxlen = sizeof(int), | |
2971 | .mode = 0644, | |
2972 | .proc_handler = &proc_dointvec, | |
2973 | }, | |
2974 | { | |
2975 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
2976 | .procname = "mtu_expires", | |
2977 | .data = &ip_rt_mtu_expires, | |
2978 | .maxlen = sizeof(int), | |
2979 | .mode = 0644, | |
2980 | .proc_handler = &proc_dointvec_jiffies, | |
2981 | .strategy = &sysctl_jiffies, | |
2982 | }, | |
2983 | { | |
2984 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
2985 | .procname = "min_pmtu", | |
2986 | .data = &ip_rt_min_pmtu, | |
2987 | .maxlen = sizeof(int), | |
2988 | .mode = 0644, | |
2989 | .proc_handler = &proc_dointvec, | |
2990 | }, | |
2991 | { | |
2992 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
2993 | .procname = "min_adv_mss", | |
2994 | .data = &ip_rt_min_advmss, | |
2995 | .maxlen = sizeof(int), | |
2996 | .mode = 0644, | |
2997 | .proc_handler = &proc_dointvec, | |
2998 | }, | |
2999 | { | |
3000 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
3001 | .procname = "secret_interval", | |
3002 | .data = &ip_rt_secret_interval, | |
3003 | .maxlen = sizeof(int), | |
3004 | .mode = 0644, | |
3005 | .proc_handler = &proc_dointvec_jiffies, | |
3006 | .strategy = &sysctl_jiffies, | |
3007 | }, | |
3008 | { .ctl_name = 0 } | |
3009 | }; | |
3010 | #endif | |
3011 | ||
3012 | #ifdef CONFIG_NET_CLS_ROUTE | |
8dbde28d | 3013 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
1da177e4 LT |
3014 | #endif /* CONFIG_NET_CLS_ROUTE */ |
3015 | ||
3016 | static __initdata unsigned long rhash_entries; | |
3017 | static int __init set_rhash_entries(char *str) | |
3018 | { | |
3019 | if (!str) | |
3020 | return 0; | |
3021 | rhash_entries = simple_strtoul(str, &str, 0); | |
3022 | return 1; | |
3023 | } | |
3024 | __setup("rhash_entries=", set_rhash_entries); | |
3025 | ||
3026 | int __init ip_rt_init(void) | |
3027 | { | |
424c4b70 | 3028 | int rc = 0; |
1da177e4 | 3029 | |
29e75252 ED |
3030 | atomic_set(&rt_genid, (int) ((num_physpages ^ (num_physpages>>8)) ^ |
3031 | (jiffies ^ (jiffies >> 7)))); | |
1da177e4 LT |
3032 | |
3033 | #ifdef CONFIG_NET_CLS_ROUTE | |
8dbde28d | 3034 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
1da177e4 LT |
3035 | if (!ip_rt_acct) |
3036 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3037 | #endif |
3038 | ||
e5d679f3 AD |
3039 | ipv4_dst_ops.kmem_cachep = |
3040 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3041 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3042 | |
14e50e57 DM |
3043 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3044 | ||
424c4b70 ED |
3045 | rt_hash_table = (struct rt_hash_bucket *) |
3046 | alloc_large_system_hash("IP route cache", | |
3047 | sizeof(struct rt_hash_bucket), | |
3048 | rhash_entries, | |
3049 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3050 | 15 : 17, |
8d1502de | 3051 | 0, |
424c4b70 ED |
3052 | &rt_hash_log, |
3053 | &rt_hash_mask, | |
3054 | 0); | |
22c047cc ED |
3055 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3056 | rt_hash_lock_init(); | |
1da177e4 LT |
3057 | |
3058 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3059 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3060 | ||
1da177e4 LT |
3061 | devinet_init(); |
3062 | ip_fib_init(); | |
3063 | ||
b24b8a24 | 3064 | setup_timer(&rt_secret_timer, rt_secret_rebuild, 0); |
1da177e4 LT |
3065 | |
3066 | /* All the timers, started at system startup tend | |
3067 | to synchronize. Perturb it a bit. | |
3068 | */ | |
39c90ece ED |
3069 | schedule_delayed_work(&expires_work, |
3070 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
1da177e4 LT |
3071 | |
3072 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + | |
3073 | ip_rt_secret_interval; | |
3074 | add_timer(&rt_secret_timer); | |
3075 | ||
73b38711 | 3076 | if (ip_rt_proc_init()) |
107f1634 | 3077 | printk(KERN_ERR "Unable to create route proc files\n"); |
1da177e4 LT |
3078 | #ifdef CONFIG_XFRM |
3079 | xfrm_init(); | |
3080 | xfrm4_init(); | |
3081 | #endif | |
63f3444f TG |
3082 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3083 | ||
1da177e4 LT |
3084 | return rc; |
3085 | } | |
3086 | ||
3087 | EXPORT_SYMBOL(__ip_select_ident); | |
3088 | EXPORT_SYMBOL(ip_route_input); | |
3089 | EXPORT_SYMBOL(ip_route_output_key); |