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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 PE |
547 | |
548 | static __init int ip_rt_proc_init(struct net *net) | |
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 | } | |
579 | #else | |
580 | static inline int ip_rt_proc_init(struct net *net) | |
581 | { | |
582 | return 0; | |
583 | } | |
1da177e4 | 584 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 585 | |
1da177e4 LT |
586 | static __inline__ void rt_free(struct rtable *rt) |
587 | { | |
1da177e4 LT |
588 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
589 | } | |
590 | ||
591 | static __inline__ void rt_drop(struct rtable *rt) | |
592 | { | |
1da177e4 LT |
593 | ip_rt_put(rt); |
594 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
595 | } | |
596 | ||
597 | static __inline__ int rt_fast_clean(struct rtable *rth) | |
598 | { | |
599 | /* Kill broadcast/multicast entries very aggresively, if they | |
600 | collide in hash table with more useful entries */ | |
601 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 602 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
603 | } |
604 | ||
605 | static __inline__ int rt_valuable(struct rtable *rth) | |
606 | { | |
607 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
608 | rth->u.dst.expires; | |
609 | } | |
610 | ||
611 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
612 | { | |
613 | unsigned long age; | |
614 | int ret = 0; | |
615 | ||
616 | if (atomic_read(&rth->u.dst.__refcnt)) | |
617 | goto out; | |
618 | ||
619 | ret = 1; | |
620 | if (rth->u.dst.expires && | |
621 | time_after_eq(jiffies, rth->u.dst.expires)) | |
622 | goto out; | |
623 | ||
624 | age = jiffies - rth->u.dst.lastuse; | |
625 | ret = 0; | |
626 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
627 | (age <= tmo2 && rt_valuable(rth))) | |
628 | goto out; | |
629 | ret = 1; | |
630 | out: return ret; | |
631 | } | |
632 | ||
633 | /* Bits of score are: | |
634 | * 31: very valuable | |
635 | * 30: not quite useless | |
636 | * 29..0: usage counter | |
637 | */ | |
638 | static inline u32 rt_score(struct rtable *rt) | |
639 | { | |
640 | u32 score = jiffies - rt->u.dst.lastuse; | |
641 | ||
642 | score = ~score & ~(3<<30); | |
643 | ||
644 | if (rt_valuable(rt)) | |
645 | score |= (1<<31); | |
646 | ||
647 | if (!rt->fl.iif || | |
648 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
649 | score |= (1<<30); | |
650 | ||
651 | return score; | |
652 | } | |
653 | ||
654 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
655 | { | |
714e85be AV |
656 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
657 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 658 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
659 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
660 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
661 | (fl1->oif ^ fl2->oif) | | |
662 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
663 | } |
664 | ||
b5921910 DL |
665 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
666 | { | |
667 | return rt1->u.dst.dev->nd_net == rt2->u.dst.dev->nd_net; | |
668 | } | |
669 | ||
beb659bd ED |
670 | /* |
671 | * Perform a full scan of hash table and free all entries. | |
672 | * Can be called by a softirq or a process. | |
673 | * In the later case, we want to be reschedule if necessary | |
674 | */ | |
675 | static void rt_do_flush(int process_context) | |
676 | { | |
677 | unsigned int i; | |
678 | struct rtable *rth, *next; | |
679 | ||
680 | for (i = 0; i <= rt_hash_mask; i++) { | |
681 | if (process_context && need_resched()) | |
682 | cond_resched(); | |
683 | rth = rt_hash_table[i].chain; | |
684 | if (!rth) | |
685 | continue; | |
686 | ||
687 | spin_lock_bh(rt_hash_lock_addr(i)); | |
688 | rth = rt_hash_table[i].chain; | |
689 | rt_hash_table[i].chain = NULL; | |
690 | spin_unlock_bh(rt_hash_lock_addr(i)); | |
691 | ||
692 | for (; rth; rth = next) { | |
693 | next = rth->u.dst.rt_next; | |
694 | rt_free(rth); | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
699 | static void rt_check_expire(void) | |
1da177e4 | 700 | { |
bb1d23b0 ED |
701 | static unsigned int rover; |
702 | unsigned int i = rover, goal; | |
1da177e4 | 703 | struct rtable *rth, **rthp; |
bb1d23b0 ED |
704 | u64 mult; |
705 | ||
706 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
707 | if (ip_rt_gc_timeout > 1) | |
708 | do_div(mult, ip_rt_gc_timeout); | |
709 | goal = (unsigned int)mult; | |
39c90ece ED |
710 | if (goal > rt_hash_mask) |
711 | goal = rt_hash_mask + 1; | |
bb1d23b0 | 712 | for (; goal > 0; goal--) { |
1da177e4 LT |
713 | unsigned long tmo = ip_rt_gc_timeout; |
714 | ||
715 | i = (i + 1) & rt_hash_mask; | |
716 | rthp = &rt_hash_table[i].chain; | |
717 | ||
d90bf5a9 ED |
718 | if (need_resched()) |
719 | cond_resched(); | |
720 | ||
cfcabdcc | 721 | if (*rthp == NULL) |
bb1d23b0 | 722 | continue; |
39c90ece | 723 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 | 724 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
725 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
726 | *rthp = rth->u.dst.rt_next; | |
727 | rt_free(rth); | |
728 | continue; | |
729 | } | |
1da177e4 LT |
730 | if (rth->u.dst.expires) { |
731 | /* Entry is expired even if it is in use */ | |
39c90ece | 732 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
1da177e4 | 733 | tmo >>= 1; |
093c2ca4 | 734 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
735 | continue; |
736 | } | |
737 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
738 | tmo >>= 1; | |
093c2ca4 | 739 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
740 | continue; |
741 | } | |
742 | ||
743 | /* Cleanup aged off entries. */ | |
093c2ca4 | 744 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 745 | rt_free(rth); |
1da177e4 | 746 | } |
39c90ece | 747 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
748 | } |
749 | rover = i; | |
beb659bd ED |
750 | } |
751 | ||
752 | /* | |
753 | * rt_worker_func() is run in process context. | |
29e75252 | 754 | * we call rt_check_expire() to scan part of the hash table |
beb659bd ED |
755 | */ |
756 | static void rt_worker_func(struct work_struct *work) | |
757 | { | |
29e75252 | 758 | rt_check_expire(); |
39c90ece | 759 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
1da177e4 LT |
760 | } |
761 | ||
29e75252 ED |
762 | /* |
763 | * Pertubation of rt_genid by a small quantity [1..256] | |
764 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() | |
765 | * many times (2^24) without giving recent rt_genid. | |
766 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 767 | */ |
29e75252 | 768 | static void rt_cache_invalidate(void) |
1da177e4 | 769 | { |
29e75252 | 770 | unsigned char shuffle; |
1da177e4 | 771 | |
29e75252 ED |
772 | get_random_bytes(&shuffle, sizeof(shuffle)); |
773 | atomic_add(shuffle + 1U, &rt_genid); | |
1da177e4 LT |
774 | } |
775 | ||
29e75252 ED |
776 | /* |
777 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
778 | * delay >= 0 : invalidate & flush cache (can be long) | |
779 | */ | |
1da177e4 LT |
780 | void rt_cache_flush(int delay) |
781 | { | |
29e75252 ED |
782 | rt_cache_invalidate(); |
783 | if (delay >= 0) | |
784 | rt_do_flush(!in_softirq()); | |
1da177e4 LT |
785 | } |
786 | ||
beb659bd | 787 | /* |
29e75252 | 788 | * We change rt_genid and let gc do the cleanup |
beb659bd | 789 | */ |
1da177e4 LT |
790 | static void rt_secret_rebuild(unsigned long dummy) |
791 | { | |
29e75252 | 792 | rt_cache_invalidate(); |
beb659bd | 793 | mod_timer(&rt_secret_timer, jiffies + ip_rt_secret_interval); |
1da177e4 LT |
794 | } |
795 | ||
796 | /* | |
797 | Short description of GC goals. | |
798 | ||
799 | We want to build algorithm, which will keep routing cache | |
800 | at some equilibrium point, when number of aged off entries | |
801 | is kept approximately equal to newly generated ones. | |
802 | ||
803 | Current expiration strength is variable "expire". | |
804 | We try to adjust it dynamically, so that if networking | |
805 | is idle expires is large enough to keep enough of warm entries, | |
806 | and when load increases it reduces to limit cache size. | |
807 | */ | |
808 | ||
569d3645 | 809 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
810 | { |
811 | static unsigned long expire = RT_GC_TIMEOUT; | |
812 | static unsigned long last_gc; | |
813 | static int rover; | |
814 | static int equilibrium; | |
815 | struct rtable *rth, **rthp; | |
816 | unsigned long now = jiffies; | |
817 | int goal; | |
818 | ||
819 | /* | |
820 | * Garbage collection is pretty expensive, | |
821 | * do not make it too frequently. | |
822 | */ | |
823 | ||
824 | RT_CACHE_STAT_INC(gc_total); | |
825 | ||
826 | if (now - last_gc < ip_rt_gc_min_interval && | |
827 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
828 | RT_CACHE_STAT_INC(gc_ignored); | |
829 | goto out; | |
830 | } | |
831 | ||
832 | /* Calculate number of entries, which we want to expire now. */ | |
833 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
834 | (ip_rt_gc_elasticity << rt_hash_log); | |
835 | if (goal <= 0) { | |
836 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
837 | equilibrium = ipv4_dst_ops.gc_thresh; | |
838 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
839 | if (goal > 0) { | |
b790cedd | 840 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
841 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
842 | } | |
843 | } else { | |
844 | /* We are in dangerous area. Try to reduce cache really | |
845 | * aggressively. | |
846 | */ | |
b790cedd | 847 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
848 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
849 | } | |
850 | ||
851 | if (now - last_gc >= ip_rt_gc_min_interval) | |
852 | last_gc = now; | |
853 | ||
854 | if (goal <= 0) { | |
855 | equilibrium += goal; | |
856 | goto work_done; | |
857 | } | |
858 | ||
859 | do { | |
860 | int i, k; | |
861 | ||
862 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
863 | unsigned long tmo = expire; | |
864 | ||
865 | k = (k + 1) & rt_hash_mask; | |
866 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 867 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 | 868 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
869 | if (rth->rt_genid == atomic_read(&rt_genid) && |
870 | !rt_may_expire(rth, tmo, expire)) { | |
1da177e4 | 871 | tmo >>= 1; |
093c2ca4 | 872 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
873 | continue; |
874 | } | |
093c2ca4 | 875 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
876 | rt_free(rth); |
877 | goal--; | |
1da177e4 | 878 | } |
22c047cc | 879 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
880 | if (goal <= 0) |
881 | break; | |
882 | } | |
883 | rover = k; | |
884 | ||
885 | if (goal <= 0) | |
886 | goto work_done; | |
887 | ||
888 | /* Goal is not achieved. We stop process if: | |
889 | ||
890 | - if expire reduced to zero. Otherwise, expire is halfed. | |
891 | - if table is not full. | |
892 | - if we are called from interrupt. | |
893 | - jiffies check is just fallback/debug loop breaker. | |
894 | We will not spin here for long time in any case. | |
895 | */ | |
896 | ||
897 | RT_CACHE_STAT_INC(gc_goal_miss); | |
898 | ||
899 | if (expire == 0) | |
900 | break; | |
901 | ||
902 | expire >>= 1; | |
903 | #if RT_CACHE_DEBUG >= 2 | |
904 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
905 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
906 | #endif | |
907 | ||
908 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
909 | goto out; | |
910 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
911 | ||
912 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
913 | goto out; | |
914 | if (net_ratelimit()) | |
915 | printk(KERN_WARNING "dst cache overflow\n"); | |
916 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
917 | return 1; | |
918 | ||
919 | work_done: | |
920 | expire += ip_rt_gc_min_interval; | |
921 | if (expire > ip_rt_gc_timeout || | |
922 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
923 | expire = ip_rt_gc_timeout; | |
924 | #if RT_CACHE_DEBUG >= 2 | |
925 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
926 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
927 | #endif | |
928 | out: return 0; | |
929 | } | |
930 | ||
931 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
932 | { | |
933 | struct rtable *rth, **rthp; | |
934 | unsigned long now; | |
935 | struct rtable *cand, **candp; | |
936 | u32 min_score; | |
937 | int chain_length; | |
938 | int attempts = !in_softirq(); | |
939 | ||
940 | restart: | |
941 | chain_length = 0; | |
942 | min_score = ~(u32)0; | |
943 | cand = NULL; | |
944 | candp = NULL; | |
945 | now = jiffies; | |
946 | ||
947 | rthp = &rt_hash_table[hash].chain; | |
948 | ||
22c047cc | 949 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 950 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
951 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
952 | *rthp = rth->u.dst.rt_next; | |
953 | rt_free(rth); | |
954 | continue; | |
955 | } | |
b5921910 | 956 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
1da177e4 | 957 | /* Put it first */ |
093c2ca4 | 958 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
959 | /* |
960 | * Since lookup is lockfree, the deletion | |
961 | * must be visible to another weakly ordered CPU before | |
962 | * the insertion at the start of the hash chain. | |
963 | */ | |
093c2ca4 | 964 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
965 | rt_hash_table[hash].chain); |
966 | /* | |
967 | * Since lookup is lockfree, the update writes | |
968 | * must be ordered for consistency on SMP. | |
969 | */ | |
970 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
971 | ||
03f49f34 | 972 | dst_use(&rth->u.dst, now); |
22c047cc | 973 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
974 | |
975 | rt_drop(rt); | |
976 | *rp = rth; | |
977 | return 0; | |
978 | } | |
979 | ||
980 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
981 | u32 score = rt_score(rth); | |
982 | ||
983 | if (score <= min_score) { | |
984 | cand = rth; | |
985 | candp = rthp; | |
986 | min_score = score; | |
987 | } | |
988 | } | |
989 | ||
990 | chain_length++; | |
991 | ||
093c2ca4 | 992 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
993 | } |
994 | ||
995 | if (cand) { | |
996 | /* ip_rt_gc_elasticity used to be average length of chain | |
997 | * length, when exceeded gc becomes really aggressive. | |
998 | * | |
999 | * The second limit is less certain. At the moment it allows | |
1000 | * only 2 entries per bucket. We will see. | |
1001 | */ | |
1002 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 1003 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
1004 | rt_free(cand); |
1005 | } | |
1006 | } | |
1007 | ||
1008 | /* Try to bind route to arp only if it is output | |
1009 | route or unicast forwarding path. | |
1010 | */ | |
1011 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
1012 | int err = arp_bind_neighbour(&rt->u.dst); | |
1013 | if (err) { | |
22c047cc | 1014 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1015 | |
1016 | if (err != -ENOBUFS) { | |
1017 | rt_drop(rt); | |
1018 | return err; | |
1019 | } | |
1020 | ||
1021 | /* Neighbour tables are full and nothing | |
1022 | can be released. Try to shrink route cache, | |
1023 | it is most likely it holds some neighbour records. | |
1024 | */ | |
1025 | if (attempts-- > 0) { | |
1026 | int saved_elasticity = ip_rt_gc_elasticity; | |
1027 | int saved_int = ip_rt_gc_min_interval; | |
1028 | ip_rt_gc_elasticity = 1; | |
1029 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1030 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1031 | ip_rt_gc_min_interval = saved_int; |
1032 | ip_rt_gc_elasticity = saved_elasticity; | |
1033 | goto restart; | |
1034 | } | |
1035 | ||
1036 | if (net_ratelimit()) | |
1037 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1038 | rt_drop(rt); | |
1039 | return -ENOBUFS; | |
1040 | } | |
1041 | } | |
1042 | ||
093c2ca4 | 1043 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
1da177e4 | 1044 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 1045 | if (rt->u.dst.rt_next) { |
1da177e4 LT |
1046 | struct rtable *trt; |
1047 | printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash, | |
1048 | NIPQUAD(rt->rt_dst)); | |
093c2ca4 | 1049 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
1da177e4 LT |
1050 | printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst)); |
1051 | printk("\n"); | |
1052 | } | |
1053 | #endif | |
1054 | rt_hash_table[hash].chain = rt; | |
22c047cc | 1055 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1056 | *rp = rt; |
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | void rt_bind_peer(struct rtable *rt, int create) | |
1061 | { | |
1062 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1063 | struct inet_peer *peer; | |
1064 | ||
1065 | peer = inet_getpeer(rt->rt_dst, create); | |
1066 | ||
1067 | spin_lock_bh(&rt_peer_lock); | |
1068 | if (rt->peer == NULL) { | |
1069 | rt->peer = peer; | |
1070 | peer = NULL; | |
1071 | } | |
1072 | spin_unlock_bh(&rt_peer_lock); | |
1073 | if (peer) | |
1074 | inet_putpeer(peer); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1079 | * we still can generate some output. | |
1080 | * Random ID selection looks a bit dangerous because we have no chances to | |
1081 | * select ID being unique in a reasonable period of time. | |
1082 | * But broken packet identifier may be better than no packet at all. | |
1083 | */ | |
1084 | static void ip_select_fb_ident(struct iphdr *iph) | |
1085 | { | |
1086 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1087 | static u32 ip_fallback_id; | |
1088 | u32 salt; | |
1089 | ||
1090 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1091 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1092 | iph->id = htons(salt & 0xFFFF); |
1093 | ip_fallback_id = salt; | |
1094 | spin_unlock_bh(&ip_fb_id_lock); | |
1095 | } | |
1096 | ||
1097 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1098 | { | |
1099 | struct rtable *rt = (struct rtable *) dst; | |
1100 | ||
1101 | if (rt) { | |
1102 | if (rt->peer == NULL) | |
1103 | rt_bind_peer(rt, 1); | |
1104 | ||
1105 | /* If peer is attached to destination, it is never detached, | |
1106 | so that we need not to grab a lock to dereference it. | |
1107 | */ | |
1108 | if (rt->peer) { | |
1109 | iph->id = htons(inet_getid(rt->peer, more)); | |
1110 | return; | |
1111 | } | |
1112 | } else | |
e905a9ed | 1113 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1114 | __builtin_return_address(0)); |
1da177e4 LT |
1115 | |
1116 | ip_select_fb_ident(iph); | |
1117 | } | |
1118 | ||
1119 | static void rt_del(unsigned hash, struct rtable *rt) | |
1120 | { | |
29e75252 | 1121 | struct rtable **rthp, *aux; |
1da177e4 | 1122 | |
29e75252 | 1123 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1124 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1125 | ip_rt_put(rt); |
29e75252 ED |
1126 | while ((aux = *rthp) != NULL) { |
1127 | if (aux == rt || (aux->rt_genid != atomic_read(&rt_genid))) { | |
1128 | *rthp = aux->u.dst.rt_next; | |
1129 | rt_free(aux); | |
1130 | continue; | |
1da177e4 | 1131 | } |
29e75252 ED |
1132 | rthp = &aux->u.dst.rt_next; |
1133 | } | |
22c047cc | 1134 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1135 | } |
1136 | ||
f7655229 AV |
1137 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1138 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1139 | { |
1140 | int i, k; | |
1141 | struct in_device *in_dev = in_dev_get(dev); | |
1142 | struct rtable *rth, **rthp; | |
f7655229 | 1143 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1144 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1145 | struct netevent_redirect netevent; |
317805b8 | 1146 | struct net *net; |
1da177e4 | 1147 | |
1da177e4 LT |
1148 | if (!in_dev) |
1149 | return; | |
1150 | ||
317805b8 | 1151 | net = dev->nd_net; |
1da177e4 | 1152 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
1e637c74 | 1153 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
f97c1e0c | 1154 | || ipv4_is_zeronet(new_gw)) |
1da177e4 LT |
1155 | goto reject_redirect; |
1156 | ||
1157 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1158 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1159 | goto reject_redirect; | |
1160 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1161 | goto reject_redirect; | |
1162 | } else { | |
317805b8 | 1163 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1164 | goto reject_redirect; |
1165 | } | |
1166 | ||
1167 | for (i = 0; i < 2; i++) { | |
1168 | for (k = 0; k < 2; k++) { | |
8c7bc840 | 1169 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]); |
1da177e4 LT |
1170 | |
1171 | rthp=&rt_hash_table[hash].chain; | |
1172 | ||
1173 | rcu_read_lock(); | |
1174 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1175 | struct rtable *rt; | |
1176 | ||
1177 | if (rth->fl.fl4_dst != daddr || | |
1178 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 | 1179 | rth->fl.oif != ikeys[k] || |
29e75252 | 1180 | rth->fl.iif != 0 || |
317805b8 DL |
1181 | rth->rt_genid != atomic_read(&rt_genid) || |
1182 | rth->u.dst.dev->nd_net != net) { | |
093c2ca4 | 1183 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1184 | continue; |
1185 | } | |
1186 | ||
1187 | if (rth->rt_dst != daddr || | |
1188 | rth->rt_src != saddr || | |
1189 | rth->u.dst.error || | |
1190 | rth->rt_gateway != old_gw || | |
1191 | rth->u.dst.dev != dev) | |
1192 | break; | |
1193 | ||
1194 | dst_hold(&rth->u.dst); | |
1195 | rcu_read_unlock(); | |
1196 | ||
1197 | rt = dst_alloc(&ipv4_dst_ops); | |
1198 | if (rt == NULL) { | |
1199 | ip_rt_put(rth); | |
1200 | in_dev_put(in_dev); | |
1201 | return; | |
1202 | } | |
1203 | ||
1204 | /* Copy all the information. */ | |
1205 | *rt = *rth; | |
e905a9ed | 1206 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
1da177e4 LT |
1207 | rt->u.dst.__use = 1; |
1208 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1209 | rt->u.dst.child = NULL; | |
1210 | if (rt->u.dst.dev) | |
1211 | dev_hold(rt->u.dst.dev); | |
1212 | if (rt->idev) | |
1213 | in_dev_hold(rt->idev); | |
1214 | rt->u.dst.obsolete = 0; | |
1215 | rt->u.dst.lastuse = jiffies; | |
1216 | rt->u.dst.path = &rt->u.dst; | |
1217 | rt->u.dst.neighbour = NULL; | |
1218 | rt->u.dst.hh = NULL; | |
1219 | rt->u.dst.xfrm = NULL; | |
29e75252 | 1220 | rt->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1221 | rt->rt_flags |= RTCF_REDIRECTED; |
1222 | ||
1223 | /* Gateway is different ... */ | |
1224 | rt->rt_gateway = new_gw; | |
1225 | ||
1226 | /* Redirect received -> path was valid */ | |
1227 | dst_confirm(&rth->u.dst); | |
1228 | ||
1229 | if (rt->peer) | |
1230 | atomic_inc(&rt->peer->refcnt); | |
1231 | ||
1232 | if (arp_bind_neighbour(&rt->u.dst) || | |
1233 | !(rt->u.dst.neighbour->nud_state & | |
1234 | NUD_VALID)) { | |
1235 | if (rt->u.dst.neighbour) | |
1236 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1237 | ip_rt_put(rth); | |
1238 | rt_drop(rt); | |
1239 | goto do_next; | |
1240 | } | |
e905a9ed | 1241 | |
8d71740c TT |
1242 | netevent.old = &rth->u.dst; |
1243 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1244 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1245 | &netevent); | |
1da177e4 LT |
1246 | |
1247 | rt_del(hash, rth); | |
1248 | if (!rt_intern_hash(hash, rt, &rt)) | |
1249 | ip_rt_put(rt); | |
1250 | goto do_next; | |
1251 | } | |
1252 | rcu_read_unlock(); | |
1253 | do_next: | |
1254 | ; | |
1255 | } | |
1256 | } | |
1257 | in_dev_put(in_dev); | |
1258 | return; | |
1259 | ||
1260 | reject_redirect: | |
1261 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1262 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
1263 | printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about " | |
1264 | "%u.%u.%u.%u ignored.\n" | |
cef2685e | 1265 | " Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n", |
1da177e4 | 1266 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1267 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1268 | #endif |
1269 | in_dev_put(in_dev); | |
1270 | } | |
1271 | ||
1272 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1273 | { | |
1274 | struct rtable *rt = (struct rtable*)dst; | |
1275 | struct dst_entry *ret = dst; | |
1276 | ||
1277 | if (rt) { | |
1278 | if (dst->obsolete) { | |
1279 | ip_rt_put(rt); | |
1280 | ret = NULL; | |
1281 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1282 | rt->u.dst.expires) { | |
8c7bc840 AV |
1283 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
1284 | rt->fl.oif); | |
1da177e4 | 1285 | #if RT_CACHE_DEBUG >= 1 |
56c99d04 | 1286 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to " |
1da177e4 LT |
1287 | "%u.%u.%u.%u/%02x dropped\n", |
1288 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); | |
1289 | #endif | |
1290 | rt_del(hash, rt); | |
1291 | ret = NULL; | |
1292 | } | |
1293 | } | |
1294 | return ret; | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Algorithm: | |
1299 | * 1. The first ip_rt_redirect_number redirects are sent | |
1300 | * with exponential backoff, then we stop sending them at all, | |
1301 | * assuming that the host ignores our redirects. | |
1302 | * 2. If we did not see packets requiring redirects | |
1303 | * during ip_rt_redirect_silence, we assume that the host | |
1304 | * forgot redirected route and start to send redirects again. | |
1305 | * | |
1306 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1307 | * in icmp.c. | |
1308 | * | |
1309 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1310 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1311 | */ | |
1312 | ||
1313 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1314 | { | |
1315 | struct rtable *rt = (struct rtable*)skb->dst; | |
1316 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); | |
1317 | ||
1318 | if (!in_dev) | |
1319 | return; | |
1320 | ||
1321 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1322 | goto out; | |
1323 | ||
1324 | /* No redirected packets during ip_rt_redirect_silence; | |
1325 | * reset the algorithm. | |
1326 | */ | |
1327 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1328 | rt->u.dst.rate_tokens = 0; | |
1329 | ||
1330 | /* Too many ignored redirects; do not send anything | |
1331 | * set u.dst.rate_last to the last seen redirected packet. | |
1332 | */ | |
1333 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1334 | rt->u.dst.rate_last = jiffies; | |
1335 | goto out; | |
1336 | } | |
1337 | ||
1338 | /* Check for load limit; set rate_last to the latest sent | |
1339 | * redirect. | |
1340 | */ | |
14fb8a76 LY |
1341 | if (rt->u.dst.rate_tokens == 0 || |
1342 | time_after(jiffies, | |
1da177e4 LT |
1343 | (rt->u.dst.rate_last + |
1344 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1345 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1346 | rt->u.dst.rate_last = jiffies; | |
1347 | ++rt->u.dst.rate_tokens; | |
1348 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1349 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1350 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1351 | net_ratelimit()) | |
1352 | printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores " | |
1353 | "redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n", | |
1354 | NIPQUAD(rt->rt_src), rt->rt_iif, | |
1355 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1356 | #endif | |
1357 | } | |
1358 | out: | |
e905a9ed | 1359 | in_dev_put(in_dev); |
1da177e4 LT |
1360 | } |
1361 | ||
1362 | static int ip_error(struct sk_buff *skb) | |
1363 | { | |
1364 | struct rtable *rt = (struct rtable*)skb->dst; | |
1365 | unsigned long now; | |
1366 | int code; | |
1367 | ||
1368 | switch (rt->u.dst.error) { | |
1369 | case EINVAL: | |
1370 | default: | |
1371 | goto out; | |
1372 | case EHOSTUNREACH: | |
1373 | code = ICMP_HOST_UNREACH; | |
1374 | break; | |
1375 | case ENETUNREACH: | |
1376 | code = ICMP_NET_UNREACH; | |
7f53878d | 1377 | IP_INC_STATS_BH(IPSTATS_MIB_INNOROUTES); |
1da177e4 LT |
1378 | break; |
1379 | case EACCES: | |
1380 | code = ICMP_PKT_FILTERED; | |
1381 | break; | |
1382 | } | |
1383 | ||
1384 | now = jiffies; | |
1385 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1386 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1387 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1388 | rt->u.dst.rate_last = now; | |
1389 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1390 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1391 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1392 | } | |
1393 | ||
1394 | out: kfree_skb(skb); | |
1395 | return 0; | |
e905a9ed | 1396 | } |
1da177e4 LT |
1397 | |
1398 | /* | |
1399 | * The last two values are not from the RFC but | |
1400 | * are needed for AMPRnet AX.25 paths. | |
1401 | */ | |
1402 | ||
9b5b5cff | 1403 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1404 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1405 | ||
1406 | static __inline__ unsigned short guess_mtu(unsigned short old_mtu) | |
1407 | { | |
1408 | int i; | |
e905a9ed | 1409 | |
1da177e4 LT |
1410 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1411 | if (old_mtu > mtu_plateau[i]) | |
1412 | return mtu_plateau[i]; | |
1413 | return 68; | |
1414 | } | |
1415 | ||
b5921910 DL |
1416 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
1417 | unsigned short new_mtu) | |
1da177e4 LT |
1418 | { |
1419 | int i; | |
1420 | unsigned short old_mtu = ntohs(iph->tot_len); | |
1421 | struct rtable *rth; | |
e448515c AV |
1422 | __be32 skeys[2] = { iph->saddr, 0, }; |
1423 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1424 | unsigned short est_mtu = 0; |
1425 | ||
1426 | if (ipv4_config.no_pmtu_disc) | |
1427 | return 0; | |
1428 | ||
1429 | for (i = 0; i < 2; i++) { | |
8c7bc840 | 1430 | unsigned hash = rt_hash(daddr, skeys[i], 0); |
1da177e4 LT |
1431 | |
1432 | rcu_read_lock(); | |
1433 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 1434 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
1435 | if (rth->fl.fl4_dst == daddr && |
1436 | rth->fl.fl4_src == skeys[i] && | |
1437 | rth->rt_dst == daddr && | |
1438 | rth->rt_src == iph->saddr && | |
1da177e4 | 1439 | rth->fl.iif == 0 && |
b5921910 | 1440 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU)) && |
29e75252 ED |
1441 | rth->u.dst.dev->nd_net == net && |
1442 | rth->rt_genid == atomic_read(&rt_genid)) { | |
1da177e4 LT |
1443 | unsigned short mtu = new_mtu; |
1444 | ||
1445 | if (new_mtu < 68 || new_mtu >= old_mtu) { | |
1446 | ||
1447 | /* BSD 4.2 compatibility hack :-( */ | |
1448 | if (mtu == 0 && | |
1449 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && | |
1450 | old_mtu >= 68 + (iph->ihl << 2)) | |
1451 | old_mtu -= iph->ihl << 2; | |
1452 | ||
1453 | mtu = guess_mtu(old_mtu); | |
1454 | } | |
1455 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { | |
e905a9ed | 1456 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { |
1da177e4 LT |
1457 | dst_confirm(&rth->u.dst); |
1458 | if (mtu < ip_rt_min_pmtu) { | |
1459 | mtu = ip_rt_min_pmtu; | |
1460 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1461 | (1 << RTAX_MTU); | |
1462 | } | |
1463 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1464 | dst_set_expires(&rth->u.dst, | |
1465 | ip_rt_mtu_expires); | |
1466 | } | |
1467 | est_mtu = mtu; | |
1468 | } | |
1469 | } | |
1470 | } | |
1471 | rcu_read_unlock(); | |
1472 | } | |
1473 | return est_mtu ? : new_mtu; | |
1474 | } | |
1475 | ||
1476 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1477 | { | |
1478 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && | |
1479 | !(dst_metric_locked(dst, RTAX_MTU))) { | |
1480 | if (mtu < ip_rt_min_pmtu) { | |
1481 | mtu = ip_rt_min_pmtu; | |
1482 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1483 | } | |
1484 | dst->metrics[RTAX_MTU-1] = mtu; | |
1485 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1486 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1487 | } |
1488 | } | |
1489 | ||
1490 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1491 | { | |
1492 | return NULL; | |
1493 | } | |
1494 | ||
1495 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1496 | { | |
1497 | struct rtable *rt = (struct rtable *) dst; | |
1498 | struct inet_peer *peer = rt->peer; | |
1499 | struct in_device *idev = rt->idev; | |
1500 | ||
1501 | if (peer) { | |
1502 | rt->peer = NULL; | |
1503 | inet_putpeer(peer); | |
1504 | } | |
1505 | ||
1506 | if (idev) { | |
1507 | rt->idev = NULL; | |
1508 | in_dev_put(idev); | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1513 | int how) | |
1514 | { | |
1515 | struct rtable *rt = (struct rtable *) dst; | |
1516 | struct in_device *idev = rt->idev; | |
5a3e55d6 DL |
1517 | if (dev != dev->nd_net->loopback_dev && idev && idev->dev == dev) { |
1518 | struct in_device *loopback_idev = | |
1519 | in_dev_get(dev->nd_net->loopback_dev); | |
1da177e4 LT |
1520 | if (loopback_idev) { |
1521 | rt->idev = loopback_idev; | |
1522 | in_dev_put(idev); | |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | static void ipv4_link_failure(struct sk_buff *skb) | |
1528 | { | |
1529 | struct rtable *rt; | |
1530 | ||
1531 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1532 | ||
1533 | rt = (struct rtable *) skb->dst; | |
1534 | if (rt) | |
1535 | dst_set_expires(&rt->u.dst, 0); | |
1536 | } | |
1537 | ||
1538 | static int ip_rt_bug(struct sk_buff *skb) | |
1539 | { | |
1540 | printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n", | |
eddc9ec5 | 1541 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
1da177e4 LT |
1542 | skb->dev ? skb->dev->name : "?"); |
1543 | kfree_skb(skb); | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | We do not cache source address of outgoing interface, | |
1549 | because it is used only by IP RR, TS and SRR options, | |
1550 | so that it out of fast path. | |
1551 | ||
1552 | BTW remember: "addr" is allowed to be not aligned | |
1553 | in IP options! | |
1554 | */ | |
1555 | ||
1556 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1557 | { | |
a61ced5d | 1558 | __be32 src; |
1da177e4 LT |
1559 | struct fib_result res; |
1560 | ||
1561 | if (rt->fl.iif == 0) | |
1562 | src = rt->rt_src; | |
ecfdc8c5 | 1563 | else if (fib_lookup(rt->u.dst.dev->nd_net, &rt->fl, &res) == 0) { |
1da177e4 LT |
1564 | src = FIB_RES_PREFSRC(res); |
1565 | fib_res_put(&res); | |
1566 | } else | |
1567 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1568 | RT_SCOPE_UNIVERSE); | |
1569 | memcpy(addr, &src, 4); | |
1570 | } | |
1571 | ||
1572 | #ifdef CONFIG_NET_CLS_ROUTE | |
1573 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1574 | { | |
1575 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1576 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1577 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1578 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1579 | } | |
1580 | #endif | |
1581 | ||
1582 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1583 | { | |
1584 | struct fib_info *fi = res->fi; | |
1585 | ||
1586 | if (fi) { | |
1587 | if (FIB_RES_GW(*res) && | |
1588 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1589 | rt->rt_gateway = FIB_RES_GW(*res); | |
1590 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1591 | sizeof(rt->u.dst.metrics)); | |
1592 | if (fi->fib_mtu == 0) { | |
1593 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
1594 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && | |
1595 | rt->rt_gateway != rt->rt_dst && | |
1596 | rt->u.dst.dev->mtu > 576) | |
1597 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1598 | } | |
1599 | #ifdef CONFIG_NET_CLS_ROUTE | |
1600 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1601 | #endif | |
1602 | } else | |
1603 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1604 | ||
1605 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1606 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; | |
1607 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) | |
1608 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; | |
1609 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) | |
1610 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, | |
1611 | ip_rt_min_advmss); | |
1612 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) | |
1613 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; | |
1614 | ||
1615 | #ifdef CONFIG_NET_CLS_ROUTE | |
1616 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1617 | set_class_tag(rt, fib_rules_tclass(res)); | |
1618 | #endif | |
1619 | set_class_tag(rt, itag); | |
1620 | #endif | |
e905a9ed | 1621 | rt->rt_type = res->type; |
1da177e4 LT |
1622 | } |
1623 | ||
9e12bb22 | 1624 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1625 | u8 tos, struct net_device *dev, int our) |
1626 | { | |
1627 | unsigned hash; | |
1628 | struct rtable *rth; | |
a61ced5d | 1629 | __be32 spec_dst; |
1da177e4 LT |
1630 | struct in_device *in_dev = in_dev_get(dev); |
1631 | u32 itag = 0; | |
1632 | ||
1633 | /* Primary sanity checks. */ | |
1634 | ||
1635 | if (in_dev == NULL) | |
1636 | return -EINVAL; | |
1637 | ||
1e637c74 | 1638 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1639 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1640 | goto e_inval; |
1641 | ||
f97c1e0c JP |
1642 | if (ipv4_is_zeronet(saddr)) { |
1643 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1644 | goto e_inval; |
1645 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1646 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1647 | dev, &spec_dst, &itag) < 0) | |
1648 | goto e_inval; | |
1649 | ||
1650 | rth = dst_alloc(&ipv4_dst_ops); | |
1651 | if (!rth) | |
1652 | goto e_nobufs; | |
1653 | ||
1654 | rth->u.dst.output= ip_rt_bug; | |
1655 | ||
1656 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1657 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1658 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1659 | rth->u.dst.flags |= DST_NOPOLICY; |
1660 | rth->fl.fl4_dst = daddr; | |
1661 | rth->rt_dst = daddr; | |
1662 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1663 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1664 | rth->fl.fl4_src = saddr; |
1665 | rth->rt_src = saddr; | |
1666 | #ifdef CONFIG_NET_CLS_ROUTE | |
1667 | rth->u.dst.tclassid = itag; | |
1668 | #endif | |
1669 | rth->rt_iif = | |
1670 | rth->fl.iif = dev->ifindex; | |
2774c7ab | 1671 | rth->u.dst.dev = init_net.loopback_dev; |
1da177e4 LT |
1672 | dev_hold(rth->u.dst.dev); |
1673 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1674 | rth->fl.oif = 0; | |
1675 | rth->rt_gateway = daddr; | |
1676 | rth->rt_spec_dst= spec_dst; | |
29e75252 | 1677 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 | 1678 | rth->rt_flags = RTCF_MULTICAST; |
29e75252 | 1679 | rth->rt_type = RTN_MULTICAST; |
1da177e4 LT |
1680 | if (our) { |
1681 | rth->u.dst.input= ip_local_deliver; | |
1682 | rth->rt_flags |= RTCF_LOCAL; | |
1683 | } | |
1684 | ||
1685 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1686 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
1da177e4 LT |
1687 | rth->u.dst.input = ip_mr_input; |
1688 | #endif | |
1689 | RT_CACHE_STAT_INC(in_slow_mc); | |
1690 | ||
1691 | in_dev_put(in_dev); | |
8c7bc840 | 1692 | hash = rt_hash(daddr, saddr, dev->ifindex); |
1da177e4 LT |
1693 | return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst); |
1694 | ||
1695 | e_nobufs: | |
1696 | in_dev_put(in_dev); | |
1697 | return -ENOBUFS; | |
1698 | ||
1699 | e_inval: | |
1700 | in_dev_put(in_dev); | |
1701 | return -EINVAL; | |
1702 | } | |
1703 | ||
1704 | ||
1705 | static void ip_handle_martian_source(struct net_device *dev, | |
1706 | struct in_device *in_dev, | |
1707 | struct sk_buff *skb, | |
9e12bb22 AV |
1708 | __be32 daddr, |
1709 | __be32 saddr) | |
1da177e4 LT |
1710 | { |
1711 | RT_CACHE_STAT_INC(in_martian_src); | |
1712 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1713 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1714 | /* | |
1715 | * RFC1812 recommendation, if source is martian, | |
1716 | * the only hint is MAC header. | |
1717 | */ | |
1718 | printk(KERN_WARNING "martian source %u.%u.%u.%u from " | |
1719 | "%u.%u.%u.%u, on dev %s\n", | |
1720 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
98e399f8 | 1721 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1722 | int i; |
98e399f8 | 1723 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1724 | printk(KERN_WARNING "ll header: "); |
1725 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1726 | printk("%02x", *p); | |
1727 | if (i < (dev->hard_header_len - 1)) | |
1728 | printk(":"); | |
1729 | } | |
1730 | printk("\n"); | |
1731 | } | |
1732 | } | |
1733 | #endif | |
1734 | } | |
1735 | ||
e905a9ed YH |
1736 | static inline int __mkroute_input(struct sk_buff *skb, |
1737 | struct fib_result* res, | |
1738 | struct in_device *in_dev, | |
9e12bb22 | 1739 | __be32 daddr, __be32 saddr, u32 tos, |
e905a9ed | 1740 | struct rtable **result) |
1da177e4 LT |
1741 | { |
1742 | ||
1743 | struct rtable *rth; | |
1744 | int err; | |
1745 | struct in_device *out_dev; | |
1746 | unsigned flags = 0; | |
d9c9df8c AV |
1747 | __be32 spec_dst; |
1748 | u32 itag; | |
1da177e4 LT |
1749 | |
1750 | /* get a working reference to the output device */ | |
1751 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1752 | if (out_dev == NULL) { | |
1753 | if (net_ratelimit()) | |
1754 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1755 | "_slow(). Please, report\n"); | |
1756 | return -EINVAL; | |
1757 | } | |
1758 | ||
1759 | ||
e905a9ed | 1760 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1761 | in_dev->dev, &spec_dst, &itag); |
1762 | if (err < 0) { | |
e905a9ed | 1763 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1764 | saddr); |
e905a9ed | 1765 | |
1da177e4 LT |
1766 | err = -EINVAL; |
1767 | goto cleanup; | |
1768 | } | |
1769 | ||
1770 | if (err) | |
1771 | flags |= RTCF_DIRECTSRC; | |
1772 | ||
cb7928a5 | 1773 | if (out_dev == in_dev && err && !(flags & RTCF_MASQ) && |
1da177e4 LT |
1774 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1775 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1776 | flags |= RTCF_DOREDIRECT; | |
1777 | ||
1778 | if (skb->protocol != htons(ETH_P_IP)) { | |
1779 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1780 | * invalid for proxy arp. DNAT routes are always valid. | |
1781 | */ | |
cb7928a5 | 1782 | if (out_dev == in_dev) { |
1da177e4 LT |
1783 | err = -EINVAL; |
1784 | goto cleanup; | |
1785 | } | |
1786 | } | |
1787 | ||
1788 | ||
1789 | rth = dst_alloc(&ipv4_dst_ops); | |
1790 | if (!rth) { | |
1791 | err = -ENOBUFS; | |
1792 | goto cleanup; | |
1793 | } | |
1794 | ||
ce723d8e | 1795 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1796 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1797 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1798 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1799 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1800 | rth->u.dst.flags |= DST_NOXFRM; |
1801 | rth->fl.fl4_dst = daddr; | |
1802 | rth->rt_dst = daddr; | |
1803 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1804 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1805 | rth->fl.fl4_src = saddr; |
1806 | rth->rt_src = saddr; | |
1807 | rth->rt_gateway = daddr; | |
1808 | rth->rt_iif = | |
1809 | rth->fl.iif = in_dev->dev->ifindex; | |
1810 | rth->u.dst.dev = (out_dev)->dev; | |
1811 | dev_hold(rth->u.dst.dev); | |
1812 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1813 | rth->fl.oif = 0; | |
1814 | rth->rt_spec_dst= spec_dst; | |
1815 | ||
1816 | rth->u.dst.input = ip_forward; | |
1817 | rth->u.dst.output = ip_output; | |
29e75252 | 1818 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1819 | |
1820 | rt_set_nexthop(rth, res, itag); | |
1821 | ||
1822 | rth->rt_flags = flags; | |
1823 | ||
1824 | *result = rth; | |
1825 | err = 0; | |
1826 | cleanup: | |
1827 | /* release the working reference to the output device */ | |
1828 | in_dev_put(out_dev); | |
1829 | return err; | |
e905a9ed | 1830 | } |
1da177e4 | 1831 | |
e06e7c61 DM |
1832 | static inline int ip_mkroute_input(struct sk_buff *skb, |
1833 | struct fib_result* res, | |
1834 | const struct flowi *fl, | |
1835 | struct in_device *in_dev, | |
1836 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1837 | { |
7abaa27c | 1838 | struct rtable* rth = NULL; |
1da177e4 LT |
1839 | int err; |
1840 | unsigned hash; | |
1841 | ||
1842 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1843 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
1844 | fib_select_multipath(fl, res); | |
1845 | #endif | |
1846 | ||
1847 | /* create a routing cache entry */ | |
1848 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1849 | if (err) | |
1850 | return err; | |
1da177e4 LT |
1851 | |
1852 | /* put it into the cache */ | |
8c7bc840 | 1853 | hash = rt_hash(daddr, saddr, fl->iif); |
e905a9ed | 1854 | return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
1da177e4 LT |
1855 | } |
1856 | ||
1da177e4 LT |
1857 | /* |
1858 | * NOTE. We drop all the packets that has local source | |
1859 | * addresses, because every properly looped back packet | |
1860 | * must have correct destination already attached by output routine. | |
1861 | * | |
1862 | * Such approach solves two big problems: | |
1863 | * 1. Not simplex devices are handled properly. | |
1864 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
1865 | */ | |
1866 | ||
9e12bb22 | 1867 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1868 | u8 tos, struct net_device *dev) |
1869 | { | |
1870 | struct fib_result res; | |
1871 | struct in_device *in_dev = in_dev_get(dev); | |
1872 | struct flowi fl = { .nl_u = { .ip4_u = | |
1873 | { .daddr = daddr, | |
1874 | .saddr = saddr, | |
1875 | .tos = tos, | |
1876 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1877 | } }, |
47dcf0cb | 1878 | .mark = skb->mark, |
1da177e4 LT |
1879 | .iif = dev->ifindex }; |
1880 | unsigned flags = 0; | |
1881 | u32 itag = 0; | |
1882 | struct rtable * rth; | |
1883 | unsigned hash; | |
9e12bb22 | 1884 | __be32 spec_dst; |
1da177e4 LT |
1885 | int err = -EINVAL; |
1886 | int free_res = 0; | |
84a885f4 | 1887 | struct net * net = dev->nd_net; |
1da177e4 LT |
1888 | |
1889 | /* IP on this device is disabled. */ | |
1890 | ||
1891 | if (!in_dev) | |
1892 | goto out; | |
1893 | ||
1894 | /* Check for the most weird martians, which can be not detected | |
1895 | by fib_lookup. | |
1896 | */ | |
1897 | ||
1e637c74 | 1898 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1899 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
1900 | goto martian_source; |
1901 | ||
e448515c | 1902 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1903 | goto brd_input; |
1904 | ||
1905 | /* Accept zero addresses only to limited broadcast; | |
1906 | * I even do not know to fix it or not. Waiting for complains :-) | |
1907 | */ | |
f97c1e0c | 1908 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1909 | goto martian_source; |
1910 | ||
1e637c74 | 1911 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
f97c1e0c | 1912 | ipv4_is_loopback(daddr)) |
1da177e4 LT |
1913 | goto martian_destination; |
1914 | ||
1915 | /* | |
1916 | * Now we are ready to route packet. | |
1917 | */ | |
84a885f4 | 1918 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
1da177e4 | 1919 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 1920 | goto e_hostunreach; |
1da177e4 LT |
1921 | goto no_route; |
1922 | } | |
1923 | free_res = 1; | |
1924 | ||
1925 | RT_CACHE_STAT_INC(in_slow_tot); | |
1926 | ||
1927 | if (res.type == RTN_BROADCAST) | |
1928 | goto brd_input; | |
1929 | ||
1930 | if (res.type == RTN_LOCAL) { | |
1931 | int result; | |
1932 | result = fib_validate_source(saddr, daddr, tos, | |
84a885f4 | 1933 | net->loopback_dev->ifindex, |
1da177e4 LT |
1934 | dev, &spec_dst, &itag); |
1935 | if (result < 0) | |
1936 | goto martian_source; | |
1937 | if (result) | |
1938 | flags |= RTCF_DIRECTSRC; | |
1939 | spec_dst = daddr; | |
1940 | goto local_input; | |
1941 | } | |
1942 | ||
1943 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1944 | goto e_hostunreach; |
1da177e4 LT |
1945 | if (res.type != RTN_UNICAST) |
1946 | goto martian_destination; | |
1947 | ||
1948 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1da177e4 LT |
1949 | done: |
1950 | in_dev_put(in_dev); | |
1951 | if (free_res) | |
1952 | fib_res_put(&res); | |
1953 | out: return err; | |
1954 | ||
1955 | brd_input: | |
1956 | if (skb->protocol != htons(ETH_P_IP)) | |
1957 | goto e_inval; | |
1958 | ||
f97c1e0c | 1959 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1960 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
1961 | else { | |
1962 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
1963 | &itag); | |
1964 | if (err < 0) | |
1965 | goto martian_source; | |
1966 | if (err) | |
1967 | flags |= RTCF_DIRECTSRC; | |
1968 | } | |
1969 | flags |= RTCF_BROADCAST; | |
1970 | res.type = RTN_BROADCAST; | |
1971 | RT_CACHE_STAT_INC(in_brd); | |
1972 | ||
1973 | local_input: | |
1974 | rth = dst_alloc(&ipv4_dst_ops); | |
1975 | if (!rth) | |
1976 | goto e_nobufs; | |
1977 | ||
1978 | rth->u.dst.output= ip_rt_bug; | |
29e75252 | 1979 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1980 | |
1981 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1982 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1983 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1984 | rth->u.dst.flags |= DST_NOPOLICY; |
1985 | rth->fl.fl4_dst = daddr; | |
1986 | rth->rt_dst = daddr; | |
1987 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1988 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1989 | rth->fl.fl4_src = saddr; |
1990 | rth->rt_src = saddr; | |
1991 | #ifdef CONFIG_NET_CLS_ROUTE | |
1992 | rth->u.dst.tclassid = itag; | |
1993 | #endif | |
1994 | rth->rt_iif = | |
1995 | rth->fl.iif = dev->ifindex; | |
84a885f4 | 1996 | rth->u.dst.dev = net->loopback_dev; |
1da177e4 LT |
1997 | dev_hold(rth->u.dst.dev); |
1998 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1999 | rth->rt_gateway = daddr; | |
2000 | rth->rt_spec_dst= spec_dst; | |
2001 | rth->u.dst.input= ip_local_deliver; | |
2002 | rth->rt_flags = flags|RTCF_LOCAL; | |
2003 | if (res.type == RTN_UNREACHABLE) { | |
2004 | rth->u.dst.input= ip_error; | |
2005 | rth->u.dst.error= -err; | |
2006 | rth->rt_flags &= ~RTCF_LOCAL; | |
2007 | } | |
2008 | rth->rt_type = res.type; | |
8c7bc840 | 2009 | hash = rt_hash(daddr, saddr, fl.iif); |
1da177e4 LT |
2010 | err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
2011 | goto done; | |
2012 | ||
2013 | no_route: | |
2014 | RT_CACHE_STAT_INC(in_no_route); | |
2015 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2016 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2017 | if (err == -ESRCH) |
2018 | err = -ENETUNREACH; | |
1da177e4 LT |
2019 | goto local_input; |
2020 | ||
2021 | /* | |
2022 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2023 | */ | |
2024 | martian_destination: | |
2025 | RT_CACHE_STAT_INC(in_martian_dst); | |
2026 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2027 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
2028 | printk(KERN_WARNING "martian destination %u.%u.%u.%u from " | |
2029 | "%u.%u.%u.%u, dev %s\n", | |
2030 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); | |
2031 | #endif | |
2c2910a4 DE |
2032 | |
2033 | e_hostunreach: | |
e905a9ed YH |
2034 | err = -EHOSTUNREACH; |
2035 | goto done; | |
2c2910a4 | 2036 | |
1da177e4 LT |
2037 | e_inval: |
2038 | err = -EINVAL; | |
2039 | goto done; | |
2040 | ||
2041 | e_nobufs: | |
2042 | err = -ENOBUFS; | |
2043 | goto done; | |
2044 | ||
2045 | martian_source: | |
2046 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2047 | goto e_inval; | |
2048 | } | |
2049 | ||
9e12bb22 | 2050 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2051 | u8 tos, struct net_device *dev) |
2052 | { | |
2053 | struct rtable * rth; | |
2054 | unsigned hash; | |
2055 | int iif = dev->ifindex; | |
b5921910 | 2056 | struct net *net; |
1da177e4 | 2057 | |
4136cd52 | 2058 | net = dev->nd_net; |
1da177e4 | 2059 | tos &= IPTOS_RT_MASK; |
8c7bc840 | 2060 | hash = rt_hash(daddr, saddr, iif); |
1da177e4 LT |
2061 | |
2062 | rcu_read_lock(); | |
2063 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2064 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2065 | if (rth->fl.fl4_dst == daddr && |
2066 | rth->fl.fl4_src == saddr && | |
2067 | rth->fl.iif == iif && | |
2068 | rth->fl.oif == 0 && | |
47dcf0cb | 2069 | rth->fl.mark == skb->mark && |
b5921910 | 2070 | rth->fl.fl4_tos == tos && |
29e75252 ED |
2071 | rth->u.dst.dev->nd_net == net && |
2072 | rth->rt_genid == atomic_read(&rt_genid)) { | |
03f49f34 | 2073 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2074 | RT_CACHE_STAT_INC(in_hit); |
2075 | rcu_read_unlock(); | |
2076 | skb->dst = (struct dst_entry*)rth; | |
2077 | return 0; | |
2078 | } | |
2079 | RT_CACHE_STAT_INC(in_hlist_search); | |
2080 | } | |
2081 | rcu_read_unlock(); | |
2082 | ||
2083 | /* Multicast recognition logic is moved from route cache to here. | |
2084 | The problem was that too many Ethernet cards have broken/missing | |
2085 | hardware multicast filters :-( As result the host on multicasting | |
2086 | network acquires a lot of useless route cache entries, sort of | |
2087 | SDR messages from all the world. Now we try to get rid of them. | |
2088 | Really, provided software IP multicast filter is organized | |
2089 | reasonably (at least, hashed), it does not result in a slowdown | |
2090 | comparing with route cache reject entries. | |
2091 | Note, that multicast routers are not affected, because | |
2092 | route cache entry is created eventually. | |
2093 | */ | |
f97c1e0c | 2094 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
2095 | struct in_device *in_dev; |
2096 | ||
2097 | rcu_read_lock(); | |
e5ed6399 | 2098 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 2099 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 2100 | ip_hdr(skb)->protocol); |
1da177e4 LT |
2101 | if (our |
2102 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c JP |
2103 | || (!ipv4_is_local_multicast(daddr) && |
2104 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 LT |
2105 | #endif |
2106 | ) { | |
2107 | rcu_read_unlock(); | |
2108 | return ip_route_input_mc(skb, daddr, saddr, | |
2109 | tos, dev, our); | |
2110 | } | |
2111 | } | |
2112 | rcu_read_unlock(); | |
2113 | return -EINVAL; | |
2114 | } | |
2115 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2116 | } | |
2117 | ||
2118 | static inline int __mkroute_output(struct rtable **result, | |
e905a9ed | 2119 | struct fib_result* res, |
1da177e4 | 2120 | const struct flowi *fl, |
e905a9ed YH |
2121 | const struct flowi *oldflp, |
2122 | struct net_device *dev_out, | |
2123 | unsigned flags) | |
1da177e4 LT |
2124 | { |
2125 | struct rtable *rth; | |
2126 | struct in_device *in_dev; | |
2127 | u32 tos = RT_FL_TOS(oldflp); | |
2128 | int err = 0; | |
2129 | ||
f97c1e0c | 2130 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
1da177e4 LT |
2131 | return -EINVAL; |
2132 | ||
e448515c | 2133 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 | 2134 | res->type = RTN_BROADCAST; |
f97c1e0c | 2135 | else if (ipv4_is_multicast(fl->fl4_dst)) |
1da177e4 | 2136 | res->type = RTN_MULTICAST; |
1e637c74 | 2137 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
1da177e4 LT |
2138 | return -EINVAL; |
2139 | ||
2140 | if (dev_out->flags & IFF_LOOPBACK) | |
2141 | flags |= RTCF_LOCAL; | |
2142 | ||
2143 | /* get work reference to inet device */ | |
2144 | in_dev = in_dev_get(dev_out); | |
2145 | if (!in_dev) | |
2146 | return -EINVAL; | |
2147 | ||
2148 | if (res->type == RTN_BROADCAST) { | |
2149 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2150 | if (res->fi) { | |
2151 | fib_info_put(res->fi); | |
2152 | res->fi = NULL; | |
2153 | } | |
2154 | } else if (res->type == RTN_MULTICAST) { | |
2155 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2156 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2157 | oldflp->proto)) |
2158 | flags &= ~RTCF_LOCAL; | |
2159 | /* If multicast route do not exist use | |
2160 | default one, but do not gateway in this case. | |
2161 | Yes, it is hack. | |
2162 | */ | |
2163 | if (res->fi && res->prefixlen < 4) { | |
2164 | fib_info_put(res->fi); | |
2165 | res->fi = NULL; | |
2166 | } | |
2167 | } | |
2168 | ||
2169 | ||
2170 | rth = dst_alloc(&ipv4_dst_ops); | |
2171 | if (!rth) { | |
2172 | err = -ENOBUFS; | |
2173 | goto cleanup; | |
e905a9ed | 2174 | } |
1da177e4 | 2175 | |
ce723d8e | 2176 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2177 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2178 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2179 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2180 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2181 | rth->u.dst.flags |= DST_NOPOLICY; |
2182 | ||
2183 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2184 | rth->fl.fl4_tos = tos; | |
2185 | rth->fl.fl4_src = oldflp->fl4_src; | |
2186 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2187 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2188 | rth->rt_dst = fl->fl4_dst; |
2189 | rth->rt_src = fl->fl4_src; | |
2190 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2191 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2192 | cache entry */ |
2193 | rth->u.dst.dev = dev_out; | |
2194 | dev_hold(dev_out); | |
2195 | rth->idev = in_dev_get(dev_out); | |
2196 | rth->rt_gateway = fl->fl4_dst; | |
2197 | rth->rt_spec_dst= fl->fl4_src; | |
2198 | ||
2199 | rth->u.dst.output=ip_output; | |
29e75252 | 2200 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
2201 | |
2202 | RT_CACHE_STAT_INC(out_slow_tot); | |
2203 | ||
2204 | if (flags & RTCF_LOCAL) { | |
2205 | rth->u.dst.input = ip_local_deliver; | |
2206 | rth->rt_spec_dst = fl->fl4_dst; | |
2207 | } | |
2208 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2209 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2210 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2211 | !(dev_out->flags & IFF_LOOPBACK)) { |
2212 | rth->u.dst.output = ip_mc_output; | |
2213 | RT_CACHE_STAT_INC(out_slow_mc); | |
2214 | } | |
2215 | #ifdef CONFIG_IP_MROUTE | |
2216 | if (res->type == RTN_MULTICAST) { | |
2217 | if (IN_DEV_MFORWARD(in_dev) && | |
f97c1e0c | 2218 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
1da177e4 LT |
2219 | rth->u.dst.input = ip_mr_input; |
2220 | rth->u.dst.output = ip_mc_output; | |
2221 | } | |
2222 | } | |
2223 | #endif | |
2224 | } | |
2225 | ||
2226 | rt_set_nexthop(rth, res, 0); | |
2227 | ||
2228 | rth->rt_flags = flags; | |
2229 | ||
2230 | *result = rth; | |
2231 | cleanup: | |
2232 | /* release work reference to inet device */ | |
2233 | in_dev_put(in_dev); | |
2234 | ||
2235 | return err; | |
2236 | } | |
2237 | ||
e06e7c61 DM |
2238 | static inline int ip_mkroute_output(struct rtable **rp, |
2239 | struct fib_result* res, | |
2240 | const struct flowi *fl, | |
2241 | const struct flowi *oldflp, | |
2242 | struct net_device *dev_out, | |
2243 | unsigned flags) | |
1da177e4 | 2244 | { |
7abaa27c | 2245 | struct rtable *rth = NULL; |
1da177e4 LT |
2246 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2247 | unsigned hash; | |
2248 | if (err == 0) { | |
8c7bc840 | 2249 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif); |
1da177e4 LT |
2250 | err = rt_intern_hash(hash, rth, rp); |
2251 | } | |
e905a9ed | 2252 | |
1da177e4 LT |
2253 | return err; |
2254 | } | |
2255 | ||
1da177e4 LT |
2256 | /* |
2257 | * Major route resolver routine. | |
2258 | */ | |
2259 | ||
b40afd0e DL |
2260 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
2261 | const struct flowi *oldflp) | |
1da177e4 LT |
2262 | { |
2263 | u32 tos = RT_FL_TOS(oldflp); | |
2264 | struct flowi fl = { .nl_u = { .ip4_u = | |
2265 | { .daddr = oldflp->fl4_dst, | |
2266 | .saddr = oldflp->fl4_src, | |
2267 | .tos = tos & IPTOS_RT_MASK, | |
2268 | .scope = ((tos & RTO_ONLINK) ? | |
2269 | RT_SCOPE_LINK : | |
2270 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2271 | } }, |
47dcf0cb | 2272 | .mark = oldflp->mark, |
b40afd0e | 2273 | .iif = net->loopback_dev->ifindex, |
1da177e4 LT |
2274 | .oif = oldflp->oif }; |
2275 | struct fib_result res; | |
2276 | unsigned flags = 0; | |
2277 | struct net_device *dev_out = NULL; | |
2278 | int free_res = 0; | |
2279 | int err; | |
2280 | ||
2281 | ||
2282 | res.fi = NULL; | |
2283 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2284 | res.r = NULL; | |
2285 | #endif | |
2286 | ||
2287 | if (oldflp->fl4_src) { | |
2288 | err = -EINVAL; | |
f97c1e0c | 2289 | if (ipv4_is_multicast(oldflp->fl4_src) || |
1e637c74 | 2290 | ipv4_is_lbcast(oldflp->fl4_src) || |
f97c1e0c | 2291 | ipv4_is_zeronet(oldflp->fl4_src)) |
1da177e4 LT |
2292 | goto out; |
2293 | ||
2294 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
b40afd0e | 2295 | dev_out = ip_dev_find(net, oldflp->fl4_src); |
f6c5d736 | 2296 | if (dev_out == NULL) |
1da177e4 LT |
2297 | goto out; |
2298 | ||
2299 | /* I removed check for oif == dev_out->oif here. | |
2300 | It was wrong for two reasons: | |
1ab35276 DL |
2301 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2302 | is assigned to multiple interfaces. | |
1da177e4 LT |
2303 | 2. Moreover, we are allowed to send packets with saddr |
2304 | of another iface. --ANK | |
2305 | */ | |
2306 | ||
f6c5d736 | 2307 | if (oldflp->oif == 0 |
f97c1e0c JP |
2308 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
2309 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { | |
1da177e4 LT |
2310 | /* Special hack: user can direct multicasts |
2311 | and limited broadcast via necessary interface | |
2312 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2313 | This hack is not just for fun, it allows | |
2314 | vic,vat and friends to work. | |
2315 | They bind socket to loopback, set ttl to zero | |
2316 | and expect that it will work. | |
2317 | From the viewpoint of routing cache they are broken, | |
2318 | because we are not allowed to build multicast path | |
2319 | with loopback source addr (look, routing cache | |
2320 | cannot know, that ttl is zero, so that packet | |
2321 | will not leave this host and route is valid). | |
2322 | Luckily, this hack is good workaround. | |
2323 | */ | |
2324 | ||
2325 | fl.oif = dev_out->ifindex; | |
2326 | goto make_route; | |
2327 | } | |
2328 | if (dev_out) | |
2329 | dev_put(dev_out); | |
2330 | dev_out = NULL; | |
2331 | } | |
2332 | ||
2333 | ||
2334 | if (oldflp->oif) { | |
b40afd0e | 2335 | dev_out = dev_get_by_index(net, oldflp->oif); |
1da177e4 LT |
2336 | err = -ENODEV; |
2337 | if (dev_out == NULL) | |
2338 | goto out; | |
e5ed6399 HX |
2339 | |
2340 | /* RACE: Check return value of inet_select_addr instead. */ | |
2341 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2342 | dev_put(dev_out); |
2343 | goto out; /* Wrong error code */ | |
2344 | } | |
2345 | ||
f97c1e0c JP |
2346 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
2347 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { | |
1da177e4 LT |
2348 | if (!fl.fl4_src) |
2349 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2350 | RT_SCOPE_LINK); | |
2351 | goto make_route; | |
2352 | } | |
2353 | if (!fl.fl4_src) { | |
f97c1e0c | 2354 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
1da177e4 LT |
2355 | fl.fl4_src = inet_select_addr(dev_out, 0, |
2356 | fl.fl4_scope); | |
2357 | else if (!oldflp->fl4_dst) | |
2358 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2359 | RT_SCOPE_HOST); | |
2360 | } | |
2361 | } | |
2362 | ||
2363 | if (!fl.fl4_dst) { | |
2364 | fl.fl4_dst = fl.fl4_src; | |
2365 | if (!fl.fl4_dst) | |
2366 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2367 | if (dev_out) | |
2368 | dev_put(dev_out); | |
b40afd0e | 2369 | dev_out = net->loopback_dev; |
1da177e4 | 2370 | dev_hold(dev_out); |
b40afd0e | 2371 | fl.oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2372 | res.type = RTN_LOCAL; |
2373 | flags |= RTCF_LOCAL; | |
2374 | goto make_route; | |
2375 | } | |
2376 | ||
b40afd0e | 2377 | if (fib_lookup(net, &fl, &res)) { |
1da177e4 LT |
2378 | res.fi = NULL; |
2379 | if (oldflp->oif) { | |
2380 | /* Apparently, routing tables are wrong. Assume, | |
2381 | that the destination is on link. | |
2382 | ||
2383 | WHY? DW. | |
2384 | Because we are allowed to send to iface | |
2385 | even if it has NO routes and NO assigned | |
2386 | addresses. When oif is specified, routing | |
2387 | tables are looked up with only one purpose: | |
2388 | to catch if destination is gatewayed, rather than | |
2389 | direct. Moreover, if MSG_DONTROUTE is set, | |
2390 | we send packet, ignoring both routing tables | |
2391 | and ifaddr state. --ANK | |
2392 | ||
2393 | ||
2394 | We could make it even if oif is unknown, | |
2395 | likely IPv6, but we do not. | |
2396 | */ | |
2397 | ||
2398 | if (fl.fl4_src == 0) | |
2399 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2400 | RT_SCOPE_LINK); | |
2401 | res.type = RTN_UNICAST; | |
2402 | goto make_route; | |
2403 | } | |
2404 | if (dev_out) | |
2405 | dev_put(dev_out); | |
2406 | err = -ENETUNREACH; | |
2407 | goto out; | |
2408 | } | |
2409 | free_res = 1; | |
2410 | ||
2411 | if (res.type == RTN_LOCAL) { | |
2412 | if (!fl.fl4_src) | |
2413 | fl.fl4_src = fl.fl4_dst; | |
2414 | if (dev_out) | |
2415 | dev_put(dev_out); | |
b40afd0e | 2416 | dev_out = net->loopback_dev; |
1da177e4 LT |
2417 | dev_hold(dev_out); |
2418 | fl.oif = dev_out->ifindex; | |
2419 | if (res.fi) | |
2420 | fib_info_put(res.fi); | |
2421 | res.fi = NULL; | |
2422 | flags |= RTCF_LOCAL; | |
2423 | goto make_route; | |
2424 | } | |
2425 | ||
2426 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2427 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2428 | fib_select_multipath(&fl, &res); | |
2429 | else | |
2430 | #endif | |
2431 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
b40afd0e | 2432 | fib_select_default(net, &fl, &res); |
1da177e4 LT |
2433 | |
2434 | if (!fl.fl4_src) | |
2435 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2436 | ||
2437 | if (dev_out) | |
2438 | dev_put(dev_out); | |
2439 | dev_out = FIB_RES_DEV(res); | |
2440 | dev_hold(dev_out); | |
2441 | fl.oif = dev_out->ifindex; | |
2442 | ||
2443 | ||
2444 | make_route: | |
2445 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2446 | ||
2447 | ||
2448 | if (free_res) | |
2449 | fib_res_put(&res); | |
2450 | if (dev_out) | |
2451 | dev_put(dev_out); | |
2452 | out: return err; | |
2453 | } | |
2454 | ||
611c183e DL |
2455 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
2456 | const struct flowi *flp) | |
1da177e4 LT |
2457 | { |
2458 | unsigned hash; | |
2459 | struct rtable *rth; | |
2460 | ||
8c7bc840 | 2461 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif); |
1da177e4 LT |
2462 | |
2463 | rcu_read_lock_bh(); | |
2464 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2465 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2466 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2467 | rth->fl.fl4_src == flp->fl4_src && | |
2468 | rth->fl.iif == 0 && | |
2469 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2470 | rth->fl.mark == flp->mark && |
1da177e4 | 2471 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
b5921910 | 2472 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
29e75252 ED |
2473 | rth->u.dst.dev->nd_net == net && |
2474 | rth->rt_genid == atomic_read(&rt_genid)) { | |
03f49f34 | 2475 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2476 | RT_CACHE_STAT_INC(out_hit); |
2477 | rcu_read_unlock_bh(); | |
2478 | *rp = rth; | |
2479 | return 0; | |
2480 | } | |
2481 | RT_CACHE_STAT_INC(out_hlist_search); | |
2482 | } | |
2483 | rcu_read_unlock_bh(); | |
2484 | ||
611c183e | 2485 | return ip_route_output_slow(net, rp, flp); |
1da177e4 LT |
2486 | } |
2487 | ||
d8c97a94 ACM |
2488 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2489 | ||
14e50e57 DM |
2490 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2491 | { | |
2492 | } | |
2493 | ||
2494 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2495 | .family = AF_INET, | |
2496 | .protocol = __constant_htons(ETH_P_IP), | |
2497 | .destroy = ipv4_dst_destroy, | |
2498 | .check = ipv4_dst_check, | |
2499 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
2500 | .entry_size = sizeof(struct rtable), | |
e2422970 | 2501 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
2502 | }; |
2503 | ||
2504 | ||
14e50e57 DM |
2505 | static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp, struct sock *sk) |
2506 | { | |
2507 | struct rtable *ort = *rp; | |
2508 | struct rtable *rt = (struct rtable *) | |
2509 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2510 | ||
2511 | if (rt) { | |
2512 | struct dst_entry *new = &rt->u.dst; | |
2513 | ||
2514 | atomic_set(&new->__refcnt, 1); | |
2515 | new->__use = 1; | |
352e512c HX |
2516 | new->input = dst_discard; |
2517 | new->output = dst_discard; | |
14e50e57 DM |
2518 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
2519 | ||
2520 | new->dev = ort->u.dst.dev; | |
2521 | if (new->dev) | |
2522 | dev_hold(new->dev); | |
2523 | ||
2524 | rt->fl = ort->fl; | |
2525 | ||
2526 | rt->idev = ort->idev; | |
2527 | if (rt->idev) | |
2528 | in_dev_hold(rt->idev); | |
29e75252 | 2529 | rt->rt_genid = atomic_read(&rt_genid); |
14e50e57 DM |
2530 | rt->rt_flags = ort->rt_flags; |
2531 | rt->rt_type = ort->rt_type; | |
2532 | rt->rt_dst = ort->rt_dst; | |
2533 | rt->rt_src = ort->rt_src; | |
2534 | rt->rt_iif = ort->rt_iif; | |
2535 | rt->rt_gateway = ort->rt_gateway; | |
2536 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2537 | rt->peer = ort->peer; | |
2538 | if (rt->peer) | |
2539 | atomic_inc(&rt->peer->refcnt); | |
2540 | ||
2541 | dst_free(new); | |
2542 | } | |
2543 | ||
2544 | dst_release(&(*rp)->u.dst); | |
2545 | *rp = rt; | |
2546 | return (rt ? 0 : -ENOMEM); | |
2547 | } | |
2548 | ||
f1b050bf DL |
2549 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
2550 | struct sock *sk, int flags) | |
1da177e4 LT |
2551 | { |
2552 | int err; | |
2553 | ||
f1b050bf | 2554 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
1da177e4 LT |
2555 | return err; |
2556 | ||
2557 | if (flp->proto) { | |
2558 | if (!flp->fl4_src) | |
2559 | flp->fl4_src = (*rp)->rt_src; | |
2560 | if (!flp->fl4_dst) | |
2561 | flp->fl4_dst = (*rp)->rt_dst; | |
bb72845e HX |
2562 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, |
2563 | flags ? XFRM_LOOKUP_WAIT : 0); | |
14e50e57 DM |
2564 | if (err == -EREMOTE) |
2565 | err = ipv4_dst_blackhole(rp, flp, sk); | |
2566 | ||
2567 | return err; | |
1da177e4 LT |
2568 | } |
2569 | ||
2570 | return 0; | |
2571 | } | |
2572 | ||
d8c97a94 ACM |
2573 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2574 | ||
f206351a | 2575 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
1da177e4 | 2576 | { |
f206351a | 2577 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
1da177e4 LT |
2578 | } |
2579 | ||
2580 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2581 | int nowait, unsigned int flags) |
1da177e4 LT |
2582 | { |
2583 | struct rtable *rt = (struct rtable*)skb->dst; | |
2584 | struct rtmsg *r; | |
be403ea1 | 2585 | struct nlmsghdr *nlh; |
e3703b3d TG |
2586 | long expires; |
2587 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2588 | |
2589 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2590 | if (nlh == NULL) | |
26932566 | 2591 | return -EMSGSIZE; |
be403ea1 TG |
2592 | |
2593 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2594 | r->rtm_family = AF_INET; |
2595 | r->rtm_dst_len = 32; | |
2596 | r->rtm_src_len = 0; | |
2597 | r->rtm_tos = rt->fl.fl4_tos; | |
2598 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2599 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2600 | r->rtm_type = rt->rt_type; |
2601 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2602 | r->rtm_protocol = RTPROT_UNSPEC; | |
2603 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2604 | if (rt->rt_flags & RTCF_NOTIFY) | |
2605 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2606 | |
17fb2c64 | 2607 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2608 | |
1da177e4 LT |
2609 | if (rt->fl.fl4_src) { |
2610 | r->rtm_src_len = 32; | |
17fb2c64 | 2611 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2612 | } |
2613 | if (rt->u.dst.dev) | |
be403ea1 | 2614 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2615 | #ifdef CONFIG_NET_CLS_ROUTE |
2616 | if (rt->u.dst.tclassid) | |
be403ea1 | 2617 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2618 | #endif |
2619 | if (rt->fl.iif) | |
17fb2c64 | 2620 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2621 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2622 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2623 | |
1da177e4 | 2624 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2625 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2626 | |
1da177e4 | 2627 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2628 | goto nla_put_failure; |
2629 | ||
e3703b3d TG |
2630 | error = rt->u.dst.error; |
2631 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2632 | if (rt->peer) { |
e3703b3d | 2633 | id = rt->peer->ip_id_count; |
1da177e4 | 2634 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2635 | ts = rt->peer->tcp_ts; |
9d729f72 | 2636 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2637 | } |
2638 | } | |
be403ea1 | 2639 | |
1da177e4 LT |
2640 | if (rt->fl.iif) { |
2641 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2642 | __be32 dst = rt->rt_dst; |
1da177e4 | 2643 | |
f97c1e0c | 2644 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
586f1211 | 2645 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
1da177e4 LT |
2646 | int err = ipmr_get_route(skb, r, nowait); |
2647 | if (err <= 0) { | |
2648 | if (!nowait) { | |
2649 | if (err == 0) | |
2650 | return 0; | |
be403ea1 | 2651 | goto nla_put_failure; |
1da177e4 LT |
2652 | } else { |
2653 | if (err == -EMSGSIZE) | |
be403ea1 | 2654 | goto nla_put_failure; |
e3703b3d | 2655 | error = err; |
1da177e4 LT |
2656 | } |
2657 | } | |
2658 | } else | |
2659 | #endif | |
be403ea1 | 2660 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2661 | } |
2662 | ||
e3703b3d TG |
2663 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2664 | expires, error) < 0) | |
2665 | goto nla_put_failure; | |
be403ea1 TG |
2666 | |
2667 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2668 | |
be403ea1 | 2669 | nla_put_failure: |
26932566 PM |
2670 | nlmsg_cancel(skb, nlh); |
2671 | return -EMSGSIZE; | |
1da177e4 LT |
2672 | } |
2673 | ||
63f3444f | 2674 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2675 | { |
b854272b | 2676 | struct net *net = in_skb->sk->sk_net; |
d889ce3b TG |
2677 | struct rtmsg *rtm; |
2678 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2679 | struct rtable *rt = NULL; |
9e12bb22 AV |
2680 | __be32 dst = 0; |
2681 | __be32 src = 0; | |
2682 | u32 iif; | |
d889ce3b | 2683 | int err; |
1da177e4 LT |
2684 | struct sk_buff *skb; |
2685 | ||
b854272b DL |
2686 | if (net != &init_net) |
2687 | return -EINVAL; | |
2688 | ||
d889ce3b TG |
2689 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2690 | if (err < 0) | |
2691 | goto errout; | |
2692 | ||
2693 | rtm = nlmsg_data(nlh); | |
2694 | ||
1da177e4 | 2695 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2696 | if (skb == NULL) { |
2697 | err = -ENOBUFS; | |
2698 | goto errout; | |
2699 | } | |
1da177e4 LT |
2700 | |
2701 | /* Reserve room for dummy headers, this skb can pass | |
2702 | through good chunk of routing engine. | |
2703 | */ | |
459a98ed | 2704 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2705 | skb_reset_network_header(skb); |
d2c962b8 SH |
2706 | |
2707 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2708 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2709 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2710 | ||
17fb2c64 AV |
2711 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2712 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2713 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2714 | |
2715 | if (iif) { | |
d889ce3b TG |
2716 | struct net_device *dev; |
2717 | ||
881d966b | 2718 | dev = __dev_get_by_index(&init_net, iif); |
d889ce3b TG |
2719 | if (dev == NULL) { |
2720 | err = -ENODEV; | |
2721 | goto errout_free; | |
2722 | } | |
2723 | ||
1da177e4 LT |
2724 | skb->protocol = htons(ETH_P_IP); |
2725 | skb->dev = dev; | |
2726 | local_bh_disable(); | |
2727 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2728 | local_bh_enable(); | |
d889ce3b TG |
2729 | |
2730 | rt = (struct rtable*) skb->dst; | |
2731 | if (err == 0 && rt->u.dst.error) | |
1da177e4 LT |
2732 | err = -rt->u.dst.error; |
2733 | } else { | |
d889ce3b TG |
2734 | struct flowi fl = { |
2735 | .nl_u = { | |
2736 | .ip4_u = { | |
2737 | .daddr = dst, | |
2738 | .saddr = src, | |
2739 | .tos = rtm->rtm_tos, | |
2740 | }, | |
2741 | }, | |
2742 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2743 | }; | |
f206351a | 2744 | err = ip_route_output_key(&init_net, &rt, &fl); |
1da177e4 | 2745 | } |
d889ce3b | 2746 | |
1da177e4 | 2747 | if (err) |
d889ce3b | 2748 | goto errout_free; |
1da177e4 LT |
2749 | |
2750 | skb->dst = &rt->u.dst; | |
2751 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
2752 | rt->rt_flags |= RTCF_NOTIFY; | |
2753 | ||
1da177e4 | 2754 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
b6544c0b | 2755 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2756 | if (err <= 0) |
2757 | goto errout_free; | |
1da177e4 | 2758 | |
97c53cac | 2759 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2760 | errout: |
2942e900 | 2761 | return err; |
1da177e4 | 2762 | |
d889ce3b | 2763 | errout_free: |
1da177e4 | 2764 | kfree_skb(skb); |
d889ce3b | 2765 | goto errout; |
1da177e4 LT |
2766 | } |
2767 | ||
2768 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2769 | { | |
2770 | struct rtable *rt; | |
2771 | int h, s_h; | |
2772 | int idx, s_idx; | |
2773 | ||
2774 | s_h = cb->args[0]; | |
d8c92830 ED |
2775 | if (s_h < 0) |
2776 | s_h = 0; | |
1da177e4 | 2777 | s_idx = idx = cb->args[1]; |
d8c92830 | 2778 | for (h = s_h; h <= rt_hash_mask; h++) { |
1da177e4 LT |
2779 | rcu_read_lock_bh(); |
2780 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2781 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
1da177e4 LT |
2782 | if (idx < s_idx) |
2783 | continue; | |
29e75252 ED |
2784 | if (rt->rt_genid != atomic_read(&rt_genid)) |
2785 | continue; | |
1da177e4 LT |
2786 | skb->dst = dst_clone(&rt->u.dst); |
2787 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 2788 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2789 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
2790 | dst_release(xchg(&skb->dst, NULL)); |
2791 | rcu_read_unlock_bh(); | |
2792 | goto done; | |
2793 | } | |
2794 | dst_release(xchg(&skb->dst, NULL)); | |
2795 | } | |
2796 | rcu_read_unlock_bh(); | |
d8c92830 | 2797 | s_idx = 0; |
1da177e4 LT |
2798 | } |
2799 | ||
2800 | done: | |
2801 | cb->args[0] = h; | |
2802 | cb->args[1] = idx; | |
2803 | return skb->len; | |
2804 | } | |
2805 | ||
2806 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2807 | { | |
2808 | rt_cache_flush(0); | |
2809 | } | |
2810 | ||
2811 | #ifdef CONFIG_SYSCTL | |
2812 | static int flush_delay; | |
2813 | ||
2814 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, | |
2815 | struct file *filp, void __user *buffer, | |
2816 | size_t *lenp, loff_t *ppos) | |
2817 | { | |
2818 | if (write) { | |
2819 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2820 | rt_cache_flush(flush_delay); | |
2821 | return 0; | |
e905a9ed | 2822 | } |
1da177e4 LT |
2823 | |
2824 | return -EINVAL; | |
2825 | } | |
2826 | ||
2827 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
2828 | int __user *name, | |
2829 | int nlen, | |
2830 | void __user *oldval, | |
2831 | size_t __user *oldlenp, | |
2832 | void __user *newval, | |
1f29bcd7 | 2833 | size_t newlen) |
1da177e4 LT |
2834 | { |
2835 | int delay; | |
2836 | if (newlen != sizeof(int)) | |
2837 | return -EINVAL; | |
2838 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed YH |
2839 | return -EFAULT; |
2840 | rt_cache_flush(delay); | |
1da177e4 LT |
2841 | return 0; |
2842 | } | |
2843 | ||
2844 | ctl_table ipv4_route_table[] = { | |
e905a9ed | 2845 | { |
1da177e4 LT |
2846 | .ctl_name = NET_IPV4_ROUTE_FLUSH, |
2847 | .procname = "flush", | |
2848 | .data = &flush_delay, | |
2849 | .maxlen = sizeof(int), | |
7e3e0360 | 2850 | .mode = 0200, |
1da177e4 LT |
2851 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
2852 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
2853 | }, | |
1da177e4 LT |
2854 | { |
2855 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
2856 | .procname = "gc_thresh", | |
2857 | .data = &ipv4_dst_ops.gc_thresh, | |
2858 | .maxlen = sizeof(int), | |
2859 | .mode = 0644, | |
2860 | .proc_handler = &proc_dointvec, | |
2861 | }, | |
2862 | { | |
2863 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
2864 | .procname = "max_size", | |
2865 | .data = &ip_rt_max_size, | |
2866 | .maxlen = sizeof(int), | |
2867 | .mode = 0644, | |
2868 | .proc_handler = &proc_dointvec, | |
2869 | }, | |
2870 | { | |
2871 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2872 | |
1da177e4 LT |
2873 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
2874 | .procname = "gc_min_interval", | |
2875 | .data = &ip_rt_gc_min_interval, | |
2876 | .maxlen = sizeof(int), | |
2877 | .mode = 0644, | |
2878 | .proc_handler = &proc_dointvec_jiffies, | |
2879 | .strategy = &sysctl_jiffies, | |
2880 | }, | |
2881 | { | |
2882 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
2883 | .procname = "gc_min_interval_ms", | |
2884 | .data = &ip_rt_gc_min_interval, | |
2885 | .maxlen = sizeof(int), | |
2886 | .mode = 0644, | |
2887 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2888 | .strategy = &sysctl_ms_jiffies, | |
2889 | }, | |
2890 | { | |
2891 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
2892 | .procname = "gc_timeout", | |
2893 | .data = &ip_rt_gc_timeout, | |
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_INTERVAL, | |
2901 | .procname = "gc_interval", | |
2902 | .data = &ip_rt_gc_interval, | |
2903 | .maxlen = sizeof(int), | |
2904 | .mode = 0644, | |
2905 | .proc_handler = &proc_dointvec_jiffies, | |
2906 | .strategy = &sysctl_jiffies, | |
2907 | }, | |
2908 | { | |
2909 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
2910 | .procname = "redirect_load", | |
2911 | .data = &ip_rt_redirect_load, | |
2912 | .maxlen = sizeof(int), | |
2913 | .mode = 0644, | |
2914 | .proc_handler = &proc_dointvec, | |
2915 | }, | |
2916 | { | |
2917 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
2918 | .procname = "redirect_number", | |
2919 | .data = &ip_rt_redirect_number, | |
2920 | .maxlen = sizeof(int), | |
2921 | .mode = 0644, | |
2922 | .proc_handler = &proc_dointvec, | |
2923 | }, | |
2924 | { | |
2925 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
2926 | .procname = "redirect_silence", | |
2927 | .data = &ip_rt_redirect_silence, | |
2928 | .maxlen = sizeof(int), | |
2929 | .mode = 0644, | |
2930 | .proc_handler = &proc_dointvec, | |
2931 | }, | |
2932 | { | |
2933 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
2934 | .procname = "error_cost", | |
2935 | .data = &ip_rt_error_cost, | |
2936 | .maxlen = sizeof(int), | |
2937 | .mode = 0644, | |
2938 | .proc_handler = &proc_dointvec, | |
2939 | }, | |
2940 | { | |
2941 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
2942 | .procname = "error_burst", | |
2943 | .data = &ip_rt_error_burst, | |
2944 | .maxlen = sizeof(int), | |
2945 | .mode = 0644, | |
2946 | .proc_handler = &proc_dointvec, | |
2947 | }, | |
2948 | { | |
2949 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
2950 | .procname = "gc_elasticity", | |
2951 | .data = &ip_rt_gc_elasticity, | |
2952 | .maxlen = sizeof(int), | |
2953 | .mode = 0644, | |
2954 | .proc_handler = &proc_dointvec, | |
2955 | }, | |
2956 | { | |
2957 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
2958 | .procname = "mtu_expires", | |
2959 | .data = &ip_rt_mtu_expires, | |
2960 | .maxlen = sizeof(int), | |
2961 | .mode = 0644, | |
2962 | .proc_handler = &proc_dointvec_jiffies, | |
2963 | .strategy = &sysctl_jiffies, | |
2964 | }, | |
2965 | { | |
2966 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
2967 | .procname = "min_pmtu", | |
2968 | .data = &ip_rt_min_pmtu, | |
2969 | .maxlen = sizeof(int), | |
2970 | .mode = 0644, | |
2971 | .proc_handler = &proc_dointvec, | |
2972 | }, | |
2973 | { | |
2974 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
2975 | .procname = "min_adv_mss", | |
2976 | .data = &ip_rt_min_advmss, | |
2977 | .maxlen = sizeof(int), | |
2978 | .mode = 0644, | |
2979 | .proc_handler = &proc_dointvec, | |
2980 | }, | |
2981 | { | |
2982 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
2983 | .procname = "secret_interval", | |
2984 | .data = &ip_rt_secret_interval, | |
2985 | .maxlen = sizeof(int), | |
2986 | .mode = 0644, | |
2987 | .proc_handler = &proc_dointvec_jiffies, | |
2988 | .strategy = &sysctl_jiffies, | |
2989 | }, | |
2990 | { .ctl_name = 0 } | |
2991 | }; | |
2992 | #endif | |
2993 | ||
2994 | #ifdef CONFIG_NET_CLS_ROUTE | |
8dbde28d | 2995 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
1da177e4 LT |
2996 | #endif /* CONFIG_NET_CLS_ROUTE */ |
2997 | ||
2998 | static __initdata unsigned long rhash_entries; | |
2999 | static int __init set_rhash_entries(char *str) | |
3000 | { | |
3001 | if (!str) | |
3002 | return 0; | |
3003 | rhash_entries = simple_strtoul(str, &str, 0); | |
3004 | return 1; | |
3005 | } | |
3006 | __setup("rhash_entries=", set_rhash_entries); | |
3007 | ||
3008 | int __init ip_rt_init(void) | |
3009 | { | |
424c4b70 | 3010 | int rc = 0; |
1da177e4 | 3011 | |
29e75252 ED |
3012 | atomic_set(&rt_genid, (int) ((num_physpages ^ (num_physpages>>8)) ^ |
3013 | (jiffies ^ (jiffies >> 7)))); | |
1da177e4 LT |
3014 | |
3015 | #ifdef CONFIG_NET_CLS_ROUTE | |
8dbde28d | 3016 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
1da177e4 LT |
3017 | if (!ip_rt_acct) |
3018 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3019 | #endif |
3020 | ||
e5d679f3 AD |
3021 | ipv4_dst_ops.kmem_cachep = |
3022 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3023 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3024 | |
14e50e57 DM |
3025 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3026 | ||
424c4b70 ED |
3027 | rt_hash_table = (struct rt_hash_bucket *) |
3028 | alloc_large_system_hash("IP route cache", | |
3029 | sizeof(struct rt_hash_bucket), | |
3030 | rhash_entries, | |
3031 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3032 | 15 : 17, |
8d1502de | 3033 | 0, |
424c4b70 ED |
3034 | &rt_hash_log, |
3035 | &rt_hash_mask, | |
3036 | 0); | |
22c047cc ED |
3037 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3038 | rt_hash_lock_init(); | |
1da177e4 LT |
3039 | |
3040 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3041 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3042 | ||
1da177e4 LT |
3043 | devinet_init(); |
3044 | ip_fib_init(); | |
3045 | ||
b24b8a24 | 3046 | setup_timer(&rt_secret_timer, rt_secret_rebuild, 0); |
1da177e4 LT |
3047 | |
3048 | /* All the timers, started at system startup tend | |
3049 | to synchronize. Perturb it a bit. | |
3050 | */ | |
39c90ece ED |
3051 | schedule_delayed_work(&expires_work, |
3052 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
1da177e4 LT |
3053 | |
3054 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + | |
3055 | ip_rt_secret_interval; | |
3056 | add_timer(&rt_secret_timer); | |
3057 | ||
107f1634 PE |
3058 | if (ip_rt_proc_init(&init_net)) |
3059 | printk(KERN_ERR "Unable to create route proc files\n"); | |
1da177e4 LT |
3060 | #ifdef CONFIG_XFRM |
3061 | xfrm_init(); | |
3062 | xfrm4_init(); | |
3063 | #endif | |
63f3444f TG |
3064 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3065 | ||
1da177e4 LT |
3066 | return rc; |
3067 | } | |
3068 | ||
3069 | EXPORT_SYMBOL(__ip_select_ident); | |
3070 | EXPORT_SYMBOL(ip_route_input); | |
3071 | EXPORT_SYMBOL(ip_route_output_key); |