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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 | 120 | static int ip_rt_max_size; |
817bc4db SH |
121 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
122 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; | |
123 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
124 | static int ip_rt_redirect_number __read_mostly = 9; | |
125 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
126 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
127 | static int ip_rt_error_cost __read_mostly = HZ; | |
128 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
129 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
130 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; | |
131 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
132 | static int ip_rt_min_advmss __read_mostly = 256; | |
133 | static int ip_rt_secret_interval __read_mostly = 10 * 60 * HZ; | |
1da177e4 | 134 | |
beb659bd ED |
135 | static void rt_worker_func(struct work_struct *work); |
136 | static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); | |
1da177e4 LT |
137 | static struct timer_list rt_secret_timer; |
138 | ||
139 | /* | |
140 | * Interface to generic destination cache. | |
141 | */ | |
142 | ||
143 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
144 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
145 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
146 | struct net_device *dev, int how); | |
147 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
148 | static void ipv4_link_failure(struct sk_buff *skb); | |
149 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
569d3645 | 150 | static int rt_garbage_collect(struct dst_ops *ops); |
1da177e4 LT |
151 | |
152 | ||
153 | static struct dst_ops ipv4_dst_ops = { | |
154 | .family = AF_INET, | |
155 | .protocol = __constant_htons(ETH_P_IP), | |
156 | .gc = rt_garbage_collect, | |
157 | .check = ipv4_dst_check, | |
158 | .destroy = ipv4_dst_destroy, | |
159 | .ifdown = ipv4_dst_ifdown, | |
160 | .negative_advice = ipv4_negative_advice, | |
161 | .link_failure = ipv4_link_failure, | |
162 | .update_pmtu = ip_rt_update_pmtu, | |
862b82c6 | 163 | .local_out = ip_local_out, |
1da177e4 | 164 | .entry_size = sizeof(struct rtable), |
e2422970 | 165 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
166 | }; |
167 | ||
168 | #define ECN_OR_COST(class) TC_PRIO_##class | |
169 | ||
4839c52b | 170 | const __u8 ip_tos2prio[16] = { |
1da177e4 LT |
171 | TC_PRIO_BESTEFFORT, |
172 | ECN_OR_COST(FILLER), | |
173 | TC_PRIO_BESTEFFORT, | |
174 | ECN_OR_COST(BESTEFFORT), | |
175 | TC_PRIO_BULK, | |
176 | ECN_OR_COST(BULK), | |
177 | TC_PRIO_BULK, | |
178 | ECN_OR_COST(BULK), | |
179 | TC_PRIO_INTERACTIVE, | |
180 | ECN_OR_COST(INTERACTIVE), | |
181 | TC_PRIO_INTERACTIVE, | |
182 | ECN_OR_COST(INTERACTIVE), | |
183 | TC_PRIO_INTERACTIVE_BULK, | |
184 | ECN_OR_COST(INTERACTIVE_BULK), | |
185 | TC_PRIO_INTERACTIVE_BULK, | |
186 | ECN_OR_COST(INTERACTIVE_BULK) | |
187 | }; | |
188 | ||
189 | ||
190 | /* | |
191 | * Route cache. | |
192 | */ | |
193 | ||
194 | /* The locking scheme is rather straight forward: | |
195 | * | |
196 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
197 | * 2) Only writers remove entries, and they hold the lock | |
198 | * as they look at rtable reference counts. | |
199 | * 3) Only readers acquire references to rtable entries, | |
200 | * they do so with atomic increments and with the | |
201 | * lock held. | |
202 | */ | |
203 | ||
204 | struct rt_hash_bucket { | |
205 | struct rtable *chain; | |
22c047cc | 206 | }; |
8a25d5de IM |
207 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
208 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
209 | /* |
210 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
211 | * The size of this table is a power of two and depends on the number of CPUS. | |
62051200 | 212 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 213 | */ |
62051200 IM |
214 | #ifdef CONFIG_LOCKDEP |
215 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 216 | #else |
62051200 IM |
217 | # if NR_CPUS >= 32 |
218 | # define RT_HASH_LOCK_SZ 4096 | |
219 | # elif NR_CPUS >= 16 | |
220 | # define RT_HASH_LOCK_SZ 2048 | |
221 | # elif NR_CPUS >= 8 | |
222 | # define RT_HASH_LOCK_SZ 1024 | |
223 | # elif NR_CPUS >= 4 | |
224 | # define RT_HASH_LOCK_SZ 512 | |
225 | # else | |
226 | # define RT_HASH_LOCK_SZ 256 | |
227 | # endif | |
22c047cc ED |
228 | #endif |
229 | ||
230 | static spinlock_t *rt_hash_locks; | |
231 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
1ff1cc20 PE |
232 | |
233 | static __init void rt_hash_lock_init(void) | |
234 | { | |
235 | int i; | |
236 | ||
237 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, | |
238 | GFP_KERNEL); | |
239 | if (!rt_hash_locks) | |
240 | panic("IP: failed to allocate rt_hash_locks\n"); | |
241 | ||
242 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) | |
243 | spin_lock_init(&rt_hash_locks[i]); | |
244 | } | |
22c047cc ED |
245 | #else |
246 | # define rt_hash_lock_addr(slot) NULL | |
1ff1cc20 PE |
247 | |
248 | static inline void rt_hash_lock_init(void) | |
249 | { | |
250 | } | |
22c047cc | 251 | #endif |
1da177e4 | 252 | |
817bc4db SH |
253 | static struct rt_hash_bucket *rt_hash_table __read_mostly; |
254 | static unsigned rt_hash_mask __read_mostly; | |
255 | static unsigned int rt_hash_log __read_mostly; | |
256 | static atomic_t rt_genid __read_mostly; | |
1da177e4 | 257 | |
2f970d83 | 258 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c | 259 | #define RT_CACHE_STAT_INC(field) \ |
bfe5d834 | 260 | (__raw_get_cpu_var(rt_cache_stat).field++) |
1da177e4 | 261 | |
1294fc4a | 262 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx) |
1da177e4 | 263 | { |
1294fc4a SH |
264 | return jhash_3words((__force u32)(__be32)(daddr), |
265 | (__force u32)(__be32)(saddr), | |
266 | idx, atomic_read(&rt_genid)) | |
29e75252 | 267 | & rt_hash_mask; |
1da177e4 LT |
268 | } |
269 | ||
270 | #ifdef CONFIG_PROC_FS | |
271 | struct rt_cache_iter_state { | |
a75e936f | 272 | struct seq_net_private p; |
1da177e4 | 273 | int bucket; |
29e75252 | 274 | int genid; |
1da177e4 LT |
275 | }; |
276 | ||
1218854a | 277 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
1da177e4 | 278 | { |
1218854a | 279 | struct rt_cache_iter_state *st = seq->private; |
1da177e4 | 280 | struct rtable *r = NULL; |
1da177e4 LT |
281 | |
282 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
283 | rcu_read_lock_bh(); | |
29e75252 ED |
284 | r = rcu_dereference(rt_hash_table[st->bucket].chain); |
285 | while (r) { | |
1218854a | 286 | if (dev_net(r->u.dst.dev) == seq_file_net(seq) && |
a75e936f | 287 | r->rt_genid == st->genid) |
29e75252 ED |
288 | return r; |
289 | r = rcu_dereference(r->u.dst.rt_next); | |
290 | } | |
1da177e4 LT |
291 | rcu_read_unlock_bh(); |
292 | } | |
29e75252 | 293 | return r; |
1da177e4 LT |
294 | } |
295 | ||
1218854a | 296 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
642d6318 | 297 | struct rtable *r) |
1da177e4 | 298 | { |
1218854a | 299 | struct rt_cache_iter_state *st = seq->private; |
093c2ca4 | 300 | r = r->u.dst.rt_next; |
1da177e4 LT |
301 | while (!r) { |
302 | rcu_read_unlock_bh(); | |
303 | if (--st->bucket < 0) | |
304 | break; | |
305 | rcu_read_lock_bh(); | |
306 | r = rt_hash_table[st->bucket].chain; | |
307 | } | |
0bcceadc | 308 | return rcu_dereference(r); |
1da177e4 LT |
309 | } |
310 | ||
1218854a | 311 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
642d6318 DL |
312 | struct rtable *r) |
313 | { | |
1218854a YH |
314 | struct rt_cache_iter_state *st = seq->private; |
315 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { | |
316 | if (dev_net(r->u.dst.dev) != seq_file_net(seq)) | |
a75e936f | 317 | continue; |
642d6318 DL |
318 | if (r->rt_genid == st->genid) |
319 | break; | |
320 | } | |
321 | return r; | |
322 | } | |
323 | ||
1218854a | 324 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 325 | { |
1218854a | 326 | struct rtable *r = rt_cache_get_first(seq); |
1da177e4 LT |
327 | |
328 | if (r) | |
1218854a | 329 | while (pos && (r = rt_cache_get_next(seq, r))) |
1da177e4 LT |
330 | --pos; |
331 | return pos ? NULL : r; | |
332 | } | |
333 | ||
334 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
335 | { | |
29e75252 | 336 | struct rt_cache_iter_state *st = seq->private; |
29e75252 | 337 | if (*pos) |
1218854a | 338 | return rt_cache_get_idx(seq, *pos - 1); |
29e75252 ED |
339 | st->genid = atomic_read(&rt_genid); |
340 | return SEQ_START_TOKEN; | |
1da177e4 LT |
341 | } |
342 | ||
343 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
344 | { | |
29e75252 | 345 | struct rtable *r; |
1da177e4 LT |
346 | |
347 | if (v == SEQ_START_TOKEN) | |
1218854a | 348 | r = rt_cache_get_first(seq); |
1da177e4 | 349 | else |
1218854a | 350 | r = rt_cache_get_next(seq, v); |
1da177e4 LT |
351 | ++*pos; |
352 | return r; | |
353 | } | |
354 | ||
355 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
356 | { | |
357 | if (v && v != SEQ_START_TOKEN) | |
358 | rcu_read_unlock_bh(); | |
359 | } | |
360 | ||
361 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
362 | { | |
363 | if (v == SEQ_START_TOKEN) | |
364 | seq_printf(seq, "%-127s\n", | |
365 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
366 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
367 | "HHUptod\tSpecDst"); | |
368 | else { | |
369 | struct rtable *r = v; | |
5e659e4c | 370 | int len; |
1da177e4 | 371 | |
5e659e4c PE |
372 | seq_printf(seq, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" |
373 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", | |
1da177e4 LT |
374 | r->u.dst.dev ? r->u.dst.dev->name : "*", |
375 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
376 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
377 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
378 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
379 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
380 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
381 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
382 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
383 | r->fl.fl4_tos, | |
384 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
385 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
386 | dev_queue_xmit) : 0, | |
5e659e4c PE |
387 | r->rt_spec_dst, &len); |
388 | ||
389 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
e905a9ed YH |
390 | } |
391 | return 0; | |
1da177e4 LT |
392 | } |
393 | ||
f690808e | 394 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
395 | .start = rt_cache_seq_start, |
396 | .next = rt_cache_seq_next, | |
397 | .stop = rt_cache_seq_stop, | |
398 | .show = rt_cache_seq_show, | |
399 | }; | |
400 | ||
401 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
402 | { | |
a75e936f | 403 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 404 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
405 | } |
406 | ||
9a32144e | 407 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
408 | .owner = THIS_MODULE, |
409 | .open = rt_cache_seq_open, | |
410 | .read = seq_read, | |
411 | .llseek = seq_lseek, | |
a75e936f | 412 | .release = seq_release_net, |
1da177e4 LT |
413 | }; |
414 | ||
415 | ||
416 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
417 | { | |
418 | int cpu; | |
419 | ||
420 | if (*pos == 0) | |
421 | return SEQ_START_TOKEN; | |
422 | ||
423 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
424 | if (!cpu_possible(cpu)) | |
425 | continue; | |
426 | *pos = cpu+1; | |
2f970d83 | 427 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
428 | } |
429 | return NULL; | |
430 | } | |
431 | ||
432 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
433 | { | |
434 | int cpu; | |
435 | ||
436 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
437 | if (!cpu_possible(cpu)) | |
438 | continue; | |
439 | *pos = cpu+1; | |
2f970d83 | 440 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
441 | } |
442 | return NULL; | |
e905a9ed | 443 | |
1da177e4 LT |
444 | } |
445 | ||
446 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
447 | { | |
448 | ||
449 | } | |
450 | ||
451 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
452 | { | |
453 | struct rt_cache_stat *st = v; | |
454 | ||
455 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 456 | 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 |
457 | return 0; |
458 | } | |
e905a9ed | 459 | |
1da177e4 LT |
460 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
461 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
462 | atomic_read(&ipv4_dst_ops.entries), | |
463 | st->in_hit, | |
464 | st->in_slow_tot, | |
465 | st->in_slow_mc, | |
466 | st->in_no_route, | |
467 | st->in_brd, | |
468 | st->in_martian_dst, | |
469 | st->in_martian_src, | |
470 | ||
471 | st->out_hit, | |
472 | st->out_slow_tot, | |
e905a9ed | 473 | st->out_slow_mc, |
1da177e4 LT |
474 | |
475 | st->gc_total, | |
476 | st->gc_ignored, | |
477 | st->gc_goal_miss, | |
478 | st->gc_dst_overflow, | |
479 | st->in_hlist_search, | |
480 | st->out_hlist_search | |
481 | ); | |
482 | return 0; | |
483 | } | |
484 | ||
f690808e | 485 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
486 | .start = rt_cpu_seq_start, |
487 | .next = rt_cpu_seq_next, | |
488 | .stop = rt_cpu_seq_stop, | |
489 | .show = rt_cpu_seq_show, | |
490 | }; | |
491 | ||
492 | ||
493 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
494 | { | |
495 | return seq_open(file, &rt_cpu_seq_ops); | |
496 | } | |
497 | ||
9a32144e | 498 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
499 | .owner = THIS_MODULE, |
500 | .open = rt_cpu_seq_open, | |
501 | .read = seq_read, | |
502 | .llseek = seq_lseek, | |
503 | .release = seq_release, | |
504 | }; | |
505 | ||
78c686e9 PE |
506 | #ifdef CONFIG_NET_CLS_ROUTE |
507 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
508 | int length, int *eof, void *data) | |
509 | { | |
510 | unsigned int i; | |
511 | ||
512 | if ((offset & 3) || (length & 3)) | |
513 | return -EIO; | |
514 | ||
515 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
516 | *eof = 1; | |
517 | return 0; | |
518 | } | |
519 | ||
520 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
521 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
522 | *eof = 1; | |
523 | } | |
524 | ||
525 | offset /= sizeof(u32); | |
526 | ||
527 | if (length > 0) { | |
528 | u32 *dst = (u32 *) buffer; | |
529 | ||
530 | *start = buffer; | |
531 | memset(dst, 0, length); | |
532 | ||
533 | for_each_possible_cpu(i) { | |
534 | unsigned int j; | |
535 | u32 *src; | |
536 | ||
537 | src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset; | |
538 | for (j = 0; j < length/4; j++) | |
539 | dst[j] += src[j]; | |
540 | } | |
541 | } | |
542 | return length; | |
543 | } | |
544 | #endif | |
107f1634 | 545 | |
73b38711 | 546 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
547 | { |
548 | struct proc_dir_entry *pde; | |
549 | ||
550 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
551 | &rt_cache_seq_fops); | |
552 | if (!pde) | |
553 | goto err1; | |
554 | ||
77020720 WC |
555 | pde = proc_create("rt_cache", S_IRUGO, |
556 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
557 | if (!pde) |
558 | goto err2; | |
559 | ||
107f1634 PE |
560 | #ifdef CONFIG_NET_CLS_ROUTE |
561 | pde = create_proc_read_entry("rt_acct", 0, net->proc_net, | |
562 | ip_rt_acct_read, NULL); | |
563 | if (!pde) | |
564 | goto err3; | |
565 | #endif | |
566 | return 0; | |
567 | ||
568 | #ifdef CONFIG_NET_CLS_ROUTE | |
569 | err3: | |
570 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
571 | #endif | |
572 | err2: | |
573 | remove_proc_entry("rt_cache", net->proc_net); | |
574 | err1: | |
575 | return -ENOMEM; | |
576 | } | |
73b38711 DL |
577 | |
578 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
579 | { | |
580 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
581 | remove_proc_entry("rt_cache", net->proc_net); | |
582 | remove_proc_entry("rt_acct", net->proc_net); | |
583 | } | |
584 | ||
585 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
586 | .init = ip_rt_do_proc_init, | |
587 | .exit = ip_rt_do_proc_exit, | |
588 | }; | |
589 | ||
590 | static int __init ip_rt_proc_init(void) | |
591 | { | |
592 | return register_pernet_subsys(&ip_rt_proc_ops); | |
593 | } | |
594 | ||
107f1634 | 595 | #else |
73b38711 | 596 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
597 | { |
598 | return 0; | |
599 | } | |
1da177e4 | 600 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 601 | |
5969f71d | 602 | static inline void rt_free(struct rtable *rt) |
1da177e4 | 603 | { |
1da177e4 LT |
604 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
605 | } | |
606 | ||
5969f71d | 607 | static inline void rt_drop(struct rtable *rt) |
1da177e4 | 608 | { |
1da177e4 LT |
609 | ip_rt_put(rt); |
610 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
611 | } | |
612 | ||
5969f71d | 613 | static inline int rt_fast_clean(struct rtable *rth) |
1da177e4 LT |
614 | { |
615 | /* Kill broadcast/multicast entries very aggresively, if they | |
616 | collide in hash table with more useful entries */ | |
617 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 618 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
619 | } |
620 | ||
5969f71d | 621 | static inline int rt_valuable(struct rtable *rth) |
1da177e4 LT |
622 | { |
623 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
624 | rth->u.dst.expires; | |
625 | } | |
626 | ||
627 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
628 | { | |
629 | unsigned long age; | |
630 | int ret = 0; | |
631 | ||
632 | if (atomic_read(&rth->u.dst.__refcnt)) | |
633 | goto out; | |
634 | ||
635 | ret = 1; | |
636 | if (rth->u.dst.expires && | |
637 | time_after_eq(jiffies, rth->u.dst.expires)) | |
638 | goto out; | |
639 | ||
640 | age = jiffies - rth->u.dst.lastuse; | |
641 | ret = 0; | |
642 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
643 | (age <= tmo2 && rt_valuable(rth))) | |
644 | goto out; | |
645 | ret = 1; | |
646 | out: return ret; | |
647 | } | |
648 | ||
649 | /* Bits of score are: | |
650 | * 31: very valuable | |
651 | * 30: not quite useless | |
652 | * 29..0: usage counter | |
653 | */ | |
654 | static inline u32 rt_score(struct rtable *rt) | |
655 | { | |
656 | u32 score = jiffies - rt->u.dst.lastuse; | |
657 | ||
658 | score = ~score & ~(3<<30); | |
659 | ||
660 | if (rt_valuable(rt)) | |
661 | score |= (1<<31); | |
662 | ||
663 | if (!rt->fl.iif || | |
664 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
665 | score |= (1<<30); | |
666 | ||
667 | return score; | |
668 | } | |
669 | ||
670 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
671 | { | |
714e85be AV |
672 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
673 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 674 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
675 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
676 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
677 | (fl1->oif ^ fl2->oif) | | |
678 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
679 | } |
680 | ||
b5921910 DL |
681 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
682 | { | |
c346dca1 | 683 | return dev_net(rt1->u.dst.dev) == dev_net(rt2->u.dst.dev); |
b5921910 DL |
684 | } |
685 | ||
beb659bd ED |
686 | /* |
687 | * Perform a full scan of hash table and free all entries. | |
688 | * Can be called by a softirq or a process. | |
689 | * In the later case, we want to be reschedule if necessary | |
690 | */ | |
691 | static void rt_do_flush(int process_context) | |
692 | { | |
693 | unsigned int i; | |
694 | struct rtable *rth, *next; | |
695 | ||
696 | for (i = 0; i <= rt_hash_mask; i++) { | |
697 | if (process_context && need_resched()) | |
698 | cond_resched(); | |
699 | rth = rt_hash_table[i].chain; | |
700 | if (!rth) | |
701 | continue; | |
702 | ||
703 | spin_lock_bh(rt_hash_lock_addr(i)); | |
704 | rth = rt_hash_table[i].chain; | |
705 | rt_hash_table[i].chain = NULL; | |
706 | spin_unlock_bh(rt_hash_lock_addr(i)); | |
707 | ||
708 | for (; rth; rth = next) { | |
709 | next = rth->u.dst.rt_next; | |
710 | rt_free(rth); | |
711 | } | |
712 | } | |
713 | } | |
714 | ||
715 | static void rt_check_expire(void) | |
1da177e4 | 716 | { |
bb1d23b0 ED |
717 | static unsigned int rover; |
718 | unsigned int i = rover, goal; | |
1da177e4 | 719 | struct rtable *rth, **rthp; |
bb1d23b0 ED |
720 | u64 mult; |
721 | ||
722 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
723 | if (ip_rt_gc_timeout > 1) | |
724 | do_div(mult, ip_rt_gc_timeout); | |
725 | goal = (unsigned int)mult; | |
39c90ece ED |
726 | if (goal > rt_hash_mask) |
727 | goal = rt_hash_mask + 1; | |
bb1d23b0 | 728 | for (; goal > 0; goal--) { |
1da177e4 LT |
729 | unsigned long tmo = ip_rt_gc_timeout; |
730 | ||
731 | i = (i + 1) & rt_hash_mask; | |
732 | rthp = &rt_hash_table[i].chain; | |
733 | ||
d90bf5a9 ED |
734 | if (need_resched()) |
735 | cond_resched(); | |
736 | ||
cfcabdcc | 737 | if (*rthp == NULL) |
bb1d23b0 | 738 | continue; |
39c90ece | 739 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 | 740 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
741 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
742 | *rthp = rth->u.dst.rt_next; | |
743 | rt_free(rth); | |
744 | continue; | |
745 | } | |
1da177e4 LT |
746 | if (rth->u.dst.expires) { |
747 | /* Entry is expired even if it is in use */ | |
39c90ece | 748 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
1da177e4 | 749 | tmo >>= 1; |
093c2ca4 | 750 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
751 | continue; |
752 | } | |
753 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
754 | tmo >>= 1; | |
093c2ca4 | 755 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
756 | continue; |
757 | } | |
758 | ||
759 | /* Cleanup aged off entries. */ | |
093c2ca4 | 760 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 761 | rt_free(rth); |
1da177e4 | 762 | } |
39c90ece | 763 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
764 | } |
765 | rover = i; | |
beb659bd ED |
766 | } |
767 | ||
768 | /* | |
769 | * rt_worker_func() is run in process context. | |
29e75252 | 770 | * we call rt_check_expire() to scan part of the hash table |
beb659bd ED |
771 | */ |
772 | static void rt_worker_func(struct work_struct *work) | |
773 | { | |
29e75252 | 774 | rt_check_expire(); |
39c90ece | 775 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
1da177e4 LT |
776 | } |
777 | ||
29e75252 ED |
778 | /* |
779 | * Pertubation of rt_genid by a small quantity [1..256] | |
780 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() | |
781 | * many times (2^24) without giving recent rt_genid. | |
782 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 783 | */ |
29e75252 | 784 | static void rt_cache_invalidate(void) |
1da177e4 | 785 | { |
29e75252 | 786 | unsigned char shuffle; |
1da177e4 | 787 | |
29e75252 ED |
788 | get_random_bytes(&shuffle, sizeof(shuffle)); |
789 | atomic_add(shuffle + 1U, &rt_genid); | |
1da177e4 LT |
790 | } |
791 | ||
29e75252 ED |
792 | /* |
793 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
794 | * delay >= 0 : invalidate & flush cache (can be long) | |
795 | */ | |
1da177e4 LT |
796 | void rt_cache_flush(int delay) |
797 | { | |
29e75252 ED |
798 | rt_cache_invalidate(); |
799 | if (delay >= 0) | |
800 | rt_do_flush(!in_softirq()); | |
1da177e4 LT |
801 | } |
802 | ||
beb659bd | 803 | /* |
29e75252 | 804 | * We change rt_genid and let gc do the cleanup |
beb659bd | 805 | */ |
1da177e4 LT |
806 | static void rt_secret_rebuild(unsigned long dummy) |
807 | { | |
29e75252 | 808 | rt_cache_invalidate(); |
beb659bd | 809 | mod_timer(&rt_secret_timer, jiffies + ip_rt_secret_interval); |
1da177e4 LT |
810 | } |
811 | ||
812 | /* | |
813 | Short description of GC goals. | |
814 | ||
815 | We want to build algorithm, which will keep routing cache | |
816 | at some equilibrium point, when number of aged off entries | |
817 | is kept approximately equal to newly generated ones. | |
818 | ||
819 | Current expiration strength is variable "expire". | |
820 | We try to adjust it dynamically, so that if networking | |
821 | is idle expires is large enough to keep enough of warm entries, | |
822 | and when load increases it reduces to limit cache size. | |
823 | */ | |
824 | ||
569d3645 | 825 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
826 | { |
827 | static unsigned long expire = RT_GC_TIMEOUT; | |
828 | static unsigned long last_gc; | |
829 | static int rover; | |
830 | static int equilibrium; | |
831 | struct rtable *rth, **rthp; | |
832 | unsigned long now = jiffies; | |
833 | int goal; | |
834 | ||
835 | /* | |
836 | * Garbage collection is pretty expensive, | |
837 | * do not make it too frequently. | |
838 | */ | |
839 | ||
840 | RT_CACHE_STAT_INC(gc_total); | |
841 | ||
842 | if (now - last_gc < ip_rt_gc_min_interval && | |
843 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
844 | RT_CACHE_STAT_INC(gc_ignored); | |
845 | goto out; | |
846 | } | |
847 | ||
848 | /* Calculate number of entries, which we want to expire now. */ | |
849 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
850 | (ip_rt_gc_elasticity << rt_hash_log); | |
851 | if (goal <= 0) { | |
852 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
853 | equilibrium = ipv4_dst_ops.gc_thresh; | |
854 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
855 | if (goal > 0) { | |
b790cedd | 856 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
857 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
858 | } | |
859 | } else { | |
860 | /* We are in dangerous area. Try to reduce cache really | |
861 | * aggressively. | |
862 | */ | |
b790cedd | 863 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
864 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
865 | } | |
866 | ||
867 | if (now - last_gc >= ip_rt_gc_min_interval) | |
868 | last_gc = now; | |
869 | ||
870 | if (goal <= 0) { | |
871 | equilibrium += goal; | |
872 | goto work_done; | |
873 | } | |
874 | ||
875 | do { | |
876 | int i, k; | |
877 | ||
878 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
879 | unsigned long tmo = expire; | |
880 | ||
881 | k = (k + 1) & rt_hash_mask; | |
882 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 883 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 | 884 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
885 | if (rth->rt_genid == atomic_read(&rt_genid) && |
886 | !rt_may_expire(rth, tmo, expire)) { | |
1da177e4 | 887 | tmo >>= 1; |
093c2ca4 | 888 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
889 | continue; |
890 | } | |
093c2ca4 | 891 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
892 | rt_free(rth); |
893 | goal--; | |
1da177e4 | 894 | } |
22c047cc | 895 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
896 | if (goal <= 0) |
897 | break; | |
898 | } | |
899 | rover = k; | |
900 | ||
901 | if (goal <= 0) | |
902 | goto work_done; | |
903 | ||
904 | /* Goal is not achieved. We stop process if: | |
905 | ||
906 | - if expire reduced to zero. Otherwise, expire is halfed. | |
907 | - if table is not full. | |
908 | - if we are called from interrupt. | |
909 | - jiffies check is just fallback/debug loop breaker. | |
910 | We will not spin here for long time in any case. | |
911 | */ | |
912 | ||
913 | RT_CACHE_STAT_INC(gc_goal_miss); | |
914 | ||
915 | if (expire == 0) | |
916 | break; | |
917 | ||
918 | expire >>= 1; | |
919 | #if RT_CACHE_DEBUG >= 2 | |
920 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
921 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
922 | #endif | |
923 | ||
924 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
925 | goto out; | |
926 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
927 | ||
928 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
929 | goto out; | |
930 | if (net_ratelimit()) | |
931 | printk(KERN_WARNING "dst cache overflow\n"); | |
932 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
933 | return 1; | |
934 | ||
935 | work_done: | |
936 | expire += ip_rt_gc_min_interval; | |
937 | if (expire > ip_rt_gc_timeout || | |
938 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
939 | expire = ip_rt_gc_timeout; | |
940 | #if RT_CACHE_DEBUG >= 2 | |
941 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
942 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
943 | #endif | |
944 | out: return 0; | |
945 | } | |
946 | ||
947 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
948 | { | |
949 | struct rtable *rth, **rthp; | |
950 | unsigned long now; | |
951 | struct rtable *cand, **candp; | |
952 | u32 min_score; | |
953 | int chain_length; | |
954 | int attempts = !in_softirq(); | |
955 | ||
956 | restart: | |
957 | chain_length = 0; | |
958 | min_score = ~(u32)0; | |
959 | cand = NULL; | |
960 | candp = NULL; | |
961 | now = jiffies; | |
962 | ||
963 | rthp = &rt_hash_table[hash].chain; | |
964 | ||
22c047cc | 965 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 966 | while ((rth = *rthp) != NULL) { |
29e75252 ED |
967 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
968 | *rthp = rth->u.dst.rt_next; | |
969 | rt_free(rth); | |
970 | continue; | |
971 | } | |
b5921910 | 972 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
1da177e4 | 973 | /* Put it first */ |
093c2ca4 | 974 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
975 | /* |
976 | * Since lookup is lockfree, the deletion | |
977 | * must be visible to another weakly ordered CPU before | |
978 | * the insertion at the start of the hash chain. | |
979 | */ | |
093c2ca4 | 980 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
981 | rt_hash_table[hash].chain); |
982 | /* | |
983 | * Since lookup is lockfree, the update writes | |
984 | * must be ordered for consistency on SMP. | |
985 | */ | |
986 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
987 | ||
03f49f34 | 988 | dst_use(&rth->u.dst, now); |
22c047cc | 989 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
990 | |
991 | rt_drop(rt); | |
992 | *rp = rth; | |
993 | return 0; | |
994 | } | |
995 | ||
996 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
997 | u32 score = rt_score(rth); | |
998 | ||
999 | if (score <= min_score) { | |
1000 | cand = rth; | |
1001 | candp = rthp; | |
1002 | min_score = score; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | chain_length++; | |
1007 | ||
093c2ca4 | 1008 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | if (cand) { | |
1012 | /* ip_rt_gc_elasticity used to be average length of chain | |
1013 | * length, when exceeded gc becomes really aggressive. | |
1014 | * | |
1015 | * The second limit is less certain. At the moment it allows | |
1016 | * only 2 entries per bucket. We will see. | |
1017 | */ | |
1018 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 1019 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
1020 | rt_free(cand); |
1021 | } | |
1022 | } | |
1023 | ||
1024 | /* Try to bind route to arp only if it is output | |
1025 | route or unicast forwarding path. | |
1026 | */ | |
1027 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
1028 | int err = arp_bind_neighbour(&rt->u.dst); | |
1029 | if (err) { | |
22c047cc | 1030 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1031 | |
1032 | if (err != -ENOBUFS) { | |
1033 | rt_drop(rt); | |
1034 | return err; | |
1035 | } | |
1036 | ||
1037 | /* Neighbour tables are full and nothing | |
1038 | can be released. Try to shrink route cache, | |
1039 | it is most likely it holds some neighbour records. | |
1040 | */ | |
1041 | if (attempts-- > 0) { | |
1042 | int saved_elasticity = ip_rt_gc_elasticity; | |
1043 | int saved_int = ip_rt_gc_min_interval; | |
1044 | ip_rt_gc_elasticity = 1; | |
1045 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1046 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1047 | ip_rt_gc_min_interval = saved_int; |
1048 | ip_rt_gc_elasticity = saved_elasticity; | |
1049 | goto restart; | |
1050 | } | |
1051 | ||
1052 | if (net_ratelimit()) | |
1053 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1054 | rt_drop(rt); | |
1055 | return -ENOBUFS; | |
1056 | } | |
1057 | } | |
1058 | ||
093c2ca4 | 1059 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
1da177e4 | 1060 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 1061 | if (rt->u.dst.rt_next) { |
1da177e4 | 1062 | struct rtable *trt; |
a7d632b6 | 1063 | printk(KERN_DEBUG "rt_cache @%02x: " NIPQUAD_FMT, hash, |
1da177e4 | 1064 | NIPQUAD(rt->rt_dst)); |
093c2ca4 | 1065 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
a7d632b6 | 1066 | printk(" . " NIPQUAD_FMT, NIPQUAD(trt->rt_dst)); |
1da177e4 LT |
1067 | printk("\n"); |
1068 | } | |
1069 | #endif | |
1070 | rt_hash_table[hash].chain = rt; | |
22c047cc | 1071 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1072 | *rp = rt; |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | void rt_bind_peer(struct rtable *rt, int create) | |
1077 | { | |
1078 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1079 | struct inet_peer *peer; | |
1080 | ||
1081 | peer = inet_getpeer(rt->rt_dst, create); | |
1082 | ||
1083 | spin_lock_bh(&rt_peer_lock); | |
1084 | if (rt->peer == NULL) { | |
1085 | rt->peer = peer; | |
1086 | peer = NULL; | |
1087 | } | |
1088 | spin_unlock_bh(&rt_peer_lock); | |
1089 | if (peer) | |
1090 | inet_putpeer(peer); | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1095 | * we still can generate some output. | |
1096 | * Random ID selection looks a bit dangerous because we have no chances to | |
1097 | * select ID being unique in a reasonable period of time. | |
1098 | * But broken packet identifier may be better than no packet at all. | |
1099 | */ | |
1100 | static void ip_select_fb_ident(struct iphdr *iph) | |
1101 | { | |
1102 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1103 | static u32 ip_fallback_id; | |
1104 | u32 salt; | |
1105 | ||
1106 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1107 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1108 | iph->id = htons(salt & 0xFFFF); |
1109 | ip_fallback_id = salt; | |
1110 | spin_unlock_bh(&ip_fb_id_lock); | |
1111 | } | |
1112 | ||
1113 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1114 | { | |
1115 | struct rtable *rt = (struct rtable *) dst; | |
1116 | ||
1117 | if (rt) { | |
1118 | if (rt->peer == NULL) | |
1119 | rt_bind_peer(rt, 1); | |
1120 | ||
1121 | /* If peer is attached to destination, it is never detached, | |
1122 | so that we need not to grab a lock to dereference it. | |
1123 | */ | |
1124 | if (rt->peer) { | |
1125 | iph->id = htons(inet_getid(rt->peer, more)); | |
1126 | return; | |
1127 | } | |
1128 | } else | |
e905a9ed | 1129 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1130 | __builtin_return_address(0)); |
1da177e4 LT |
1131 | |
1132 | ip_select_fb_ident(iph); | |
1133 | } | |
1134 | ||
1135 | static void rt_del(unsigned hash, struct rtable *rt) | |
1136 | { | |
29e75252 | 1137 | struct rtable **rthp, *aux; |
1da177e4 | 1138 | |
29e75252 | 1139 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1140 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1141 | ip_rt_put(rt); |
29e75252 ED |
1142 | while ((aux = *rthp) != NULL) { |
1143 | if (aux == rt || (aux->rt_genid != atomic_read(&rt_genid))) { | |
1144 | *rthp = aux->u.dst.rt_next; | |
1145 | rt_free(aux); | |
1146 | continue; | |
1da177e4 | 1147 | } |
29e75252 ED |
1148 | rthp = &aux->u.dst.rt_next; |
1149 | } | |
22c047cc | 1150 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1151 | } |
1152 | ||
f7655229 AV |
1153 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1154 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1155 | { |
1156 | int i, k; | |
1157 | struct in_device *in_dev = in_dev_get(dev); | |
1158 | struct rtable *rth, **rthp; | |
f7655229 | 1159 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1160 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1161 | struct netevent_redirect netevent; |
317805b8 | 1162 | struct net *net; |
1da177e4 | 1163 | |
1da177e4 LT |
1164 | if (!in_dev) |
1165 | return; | |
1166 | ||
c346dca1 | 1167 | net = dev_net(dev); |
1da177e4 | 1168 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
1e637c74 | 1169 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
f97c1e0c | 1170 | || ipv4_is_zeronet(new_gw)) |
1da177e4 LT |
1171 | goto reject_redirect; |
1172 | ||
1173 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1174 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1175 | goto reject_redirect; | |
1176 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1177 | goto reject_redirect; | |
1178 | } else { | |
317805b8 | 1179 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1180 | goto reject_redirect; |
1181 | } | |
1182 | ||
1183 | for (i = 0; i < 2; i++) { | |
1184 | for (k = 0; k < 2; k++) { | |
8c7bc840 | 1185 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]); |
1da177e4 LT |
1186 | |
1187 | rthp=&rt_hash_table[hash].chain; | |
1188 | ||
1189 | rcu_read_lock(); | |
1190 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1191 | struct rtable *rt; | |
1192 | ||
1193 | if (rth->fl.fl4_dst != daddr || | |
1194 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 | 1195 | rth->fl.oif != ikeys[k] || |
29e75252 | 1196 | rth->fl.iif != 0 || |
317805b8 | 1197 | rth->rt_genid != atomic_read(&rt_genid) || |
878628fb | 1198 | !net_eq(dev_net(rth->u.dst.dev), net)) { |
093c2ca4 | 1199 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1200 | continue; |
1201 | } | |
1202 | ||
1203 | if (rth->rt_dst != daddr || | |
1204 | rth->rt_src != saddr || | |
1205 | rth->u.dst.error || | |
1206 | rth->rt_gateway != old_gw || | |
1207 | rth->u.dst.dev != dev) | |
1208 | break; | |
1209 | ||
1210 | dst_hold(&rth->u.dst); | |
1211 | rcu_read_unlock(); | |
1212 | ||
1213 | rt = dst_alloc(&ipv4_dst_ops); | |
1214 | if (rt == NULL) { | |
1215 | ip_rt_put(rth); | |
1216 | in_dev_put(in_dev); | |
1217 | return; | |
1218 | } | |
1219 | ||
1220 | /* Copy all the information. */ | |
1221 | *rt = *rth; | |
e905a9ed | 1222 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
1da177e4 LT |
1223 | rt->u.dst.__use = 1; |
1224 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1225 | rt->u.dst.child = NULL; | |
1226 | if (rt->u.dst.dev) | |
1227 | dev_hold(rt->u.dst.dev); | |
1228 | if (rt->idev) | |
1229 | in_dev_hold(rt->idev); | |
1230 | rt->u.dst.obsolete = 0; | |
1231 | rt->u.dst.lastuse = jiffies; | |
1232 | rt->u.dst.path = &rt->u.dst; | |
1233 | rt->u.dst.neighbour = NULL; | |
1234 | rt->u.dst.hh = NULL; | |
1235 | rt->u.dst.xfrm = NULL; | |
29e75252 | 1236 | rt->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1237 | rt->rt_flags |= RTCF_REDIRECTED; |
1238 | ||
1239 | /* Gateway is different ... */ | |
1240 | rt->rt_gateway = new_gw; | |
1241 | ||
1242 | /* Redirect received -> path was valid */ | |
1243 | dst_confirm(&rth->u.dst); | |
1244 | ||
1245 | if (rt->peer) | |
1246 | atomic_inc(&rt->peer->refcnt); | |
1247 | ||
1248 | if (arp_bind_neighbour(&rt->u.dst) || | |
1249 | !(rt->u.dst.neighbour->nud_state & | |
1250 | NUD_VALID)) { | |
1251 | if (rt->u.dst.neighbour) | |
1252 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1253 | ip_rt_put(rth); | |
1254 | rt_drop(rt); | |
1255 | goto do_next; | |
1256 | } | |
e905a9ed | 1257 | |
8d71740c TT |
1258 | netevent.old = &rth->u.dst; |
1259 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1260 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1261 | &netevent); | |
1da177e4 LT |
1262 | |
1263 | rt_del(hash, rth); | |
1264 | if (!rt_intern_hash(hash, rt, &rt)) | |
1265 | ip_rt_put(rt); | |
1266 | goto do_next; | |
1267 | } | |
1268 | rcu_read_unlock(); | |
1269 | do_next: | |
1270 | ; | |
1271 | } | |
1272 | } | |
1273 | in_dev_put(in_dev); | |
1274 | return; | |
1275 | ||
1276 | reject_redirect: | |
1277 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1278 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
a7d632b6 YH |
1279 | printk(KERN_INFO "Redirect from " NIPQUAD_FMT " on %s about " |
1280 | NIPQUAD_FMT " ignored.\n" | |
1281 | " Advised path = " NIPQUAD_FMT " -> " NIPQUAD_FMT "\n", | |
1da177e4 | 1282 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1283 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1284 | #endif |
1285 | in_dev_put(in_dev); | |
1286 | } | |
1287 | ||
1288 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1289 | { | |
ee6b9673 | 1290 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
1291 | struct dst_entry *ret = dst; |
1292 | ||
1293 | if (rt) { | |
1294 | if (dst->obsolete) { | |
1295 | ip_rt_put(rt); | |
1296 | ret = NULL; | |
1297 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1298 | rt->u.dst.expires) { | |
8c7bc840 AV |
1299 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
1300 | rt->fl.oif); | |
1da177e4 | 1301 | #if RT_CACHE_DEBUG >= 1 |
56c99d04 | 1302 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to " |
a7d632b6 | 1303 | NIPQUAD_FMT "/%02x dropped\n", |
1da177e4 LT |
1304 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); |
1305 | #endif | |
1306 | rt_del(hash, rt); | |
1307 | ret = NULL; | |
1308 | } | |
1309 | } | |
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * Algorithm: | |
1315 | * 1. The first ip_rt_redirect_number redirects are sent | |
1316 | * with exponential backoff, then we stop sending them at all, | |
1317 | * assuming that the host ignores our redirects. | |
1318 | * 2. If we did not see packets requiring redirects | |
1319 | * during ip_rt_redirect_silence, we assume that the host | |
1320 | * forgot redirected route and start to send redirects again. | |
1321 | * | |
1322 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1323 | * in icmp.c. | |
1324 | * | |
1325 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1326 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1327 | */ | |
1328 | ||
1329 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1330 | { | |
ee6b9673 | 1331 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1332 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
1333 | ||
1334 | if (!in_dev) | |
1335 | return; | |
1336 | ||
1337 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1338 | goto out; | |
1339 | ||
1340 | /* No redirected packets during ip_rt_redirect_silence; | |
1341 | * reset the algorithm. | |
1342 | */ | |
1343 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1344 | rt->u.dst.rate_tokens = 0; | |
1345 | ||
1346 | /* Too many ignored redirects; do not send anything | |
1347 | * set u.dst.rate_last to the last seen redirected packet. | |
1348 | */ | |
1349 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1350 | rt->u.dst.rate_last = jiffies; | |
1351 | goto out; | |
1352 | } | |
1353 | ||
1354 | /* Check for load limit; set rate_last to the latest sent | |
1355 | * redirect. | |
1356 | */ | |
14fb8a76 LY |
1357 | if (rt->u.dst.rate_tokens == 0 || |
1358 | time_after(jiffies, | |
1da177e4 LT |
1359 | (rt->u.dst.rate_last + |
1360 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1361 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1362 | rt->u.dst.rate_last = jiffies; | |
1363 | ++rt->u.dst.rate_tokens; | |
1364 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1365 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1366 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1367 | net_ratelimit()) | |
a7d632b6 YH |
1368 | printk(KERN_WARNING "host " NIPQUAD_FMT "/if%d ignores " |
1369 | "redirects for " NIPQUAD_FMT " to " NIPQUAD_FMT ".\n", | |
1da177e4 LT |
1370 | NIPQUAD(rt->rt_src), rt->rt_iif, |
1371 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1372 | #endif | |
1373 | } | |
1374 | out: | |
e905a9ed | 1375 | in_dev_put(in_dev); |
1da177e4 LT |
1376 | } |
1377 | ||
1378 | static int ip_error(struct sk_buff *skb) | |
1379 | { | |
ee6b9673 | 1380 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1381 | unsigned long now; |
1382 | int code; | |
1383 | ||
1384 | switch (rt->u.dst.error) { | |
1385 | case EINVAL: | |
1386 | default: | |
1387 | goto out; | |
1388 | case EHOSTUNREACH: | |
1389 | code = ICMP_HOST_UNREACH; | |
1390 | break; | |
1391 | case ENETUNREACH: | |
1392 | code = ICMP_NET_UNREACH; | |
7f53878d | 1393 | IP_INC_STATS_BH(IPSTATS_MIB_INNOROUTES); |
1da177e4 LT |
1394 | break; |
1395 | case EACCES: | |
1396 | code = ICMP_PKT_FILTERED; | |
1397 | break; | |
1398 | } | |
1399 | ||
1400 | now = jiffies; | |
1401 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1402 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1403 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1404 | rt->u.dst.rate_last = now; | |
1405 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1406 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1407 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1408 | } | |
1409 | ||
1410 | out: kfree_skb(skb); | |
1411 | return 0; | |
e905a9ed | 1412 | } |
1da177e4 LT |
1413 | |
1414 | /* | |
1415 | * The last two values are not from the RFC but | |
1416 | * are needed for AMPRnet AX.25 paths. | |
1417 | */ | |
1418 | ||
9b5b5cff | 1419 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1420 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1421 | ||
5969f71d | 1422 | static inline unsigned short guess_mtu(unsigned short old_mtu) |
1da177e4 LT |
1423 | { |
1424 | int i; | |
e905a9ed | 1425 | |
1da177e4 LT |
1426 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1427 | if (old_mtu > mtu_plateau[i]) | |
1428 | return mtu_plateau[i]; | |
1429 | return 68; | |
1430 | } | |
1431 | ||
b5921910 DL |
1432 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
1433 | unsigned short new_mtu) | |
1da177e4 LT |
1434 | { |
1435 | int i; | |
1436 | unsigned short old_mtu = ntohs(iph->tot_len); | |
1437 | struct rtable *rth; | |
e448515c AV |
1438 | __be32 skeys[2] = { iph->saddr, 0, }; |
1439 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1440 | unsigned short est_mtu = 0; |
1441 | ||
1442 | if (ipv4_config.no_pmtu_disc) | |
1443 | return 0; | |
1444 | ||
1445 | for (i = 0; i < 2; i++) { | |
8c7bc840 | 1446 | unsigned hash = rt_hash(daddr, skeys[i], 0); |
1da177e4 LT |
1447 | |
1448 | rcu_read_lock(); | |
1449 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 1450 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
1451 | if (rth->fl.fl4_dst == daddr && |
1452 | rth->fl.fl4_src == skeys[i] && | |
1453 | rth->rt_dst == daddr && | |
1454 | rth->rt_src == iph->saddr && | |
1da177e4 | 1455 | rth->fl.iif == 0 && |
b5921910 | 1456 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU)) && |
878628fb | 1457 | net_eq(dev_net(rth->u.dst.dev), net) && |
29e75252 | 1458 | rth->rt_genid == atomic_read(&rt_genid)) { |
1da177e4 LT |
1459 | unsigned short mtu = new_mtu; |
1460 | ||
1461 | if (new_mtu < 68 || new_mtu >= old_mtu) { | |
1462 | ||
1463 | /* BSD 4.2 compatibility hack :-( */ | |
1464 | if (mtu == 0 && | |
1465 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && | |
1466 | old_mtu >= 68 + (iph->ihl << 2)) | |
1467 | old_mtu -= iph->ihl << 2; | |
1468 | ||
1469 | mtu = guess_mtu(old_mtu); | |
1470 | } | |
1471 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { | |
e905a9ed | 1472 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { |
1da177e4 LT |
1473 | dst_confirm(&rth->u.dst); |
1474 | if (mtu < ip_rt_min_pmtu) { | |
1475 | mtu = ip_rt_min_pmtu; | |
1476 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1477 | (1 << RTAX_MTU); | |
1478 | } | |
1479 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1480 | dst_set_expires(&rth->u.dst, | |
1481 | ip_rt_mtu_expires); | |
1482 | } | |
1483 | est_mtu = mtu; | |
1484 | } | |
1485 | } | |
1486 | } | |
1487 | rcu_read_unlock(); | |
1488 | } | |
1489 | return est_mtu ? : new_mtu; | |
1490 | } | |
1491 | ||
1492 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1493 | { | |
1494 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && | |
1495 | !(dst_metric_locked(dst, RTAX_MTU))) { | |
1496 | if (mtu < ip_rt_min_pmtu) { | |
1497 | mtu = ip_rt_min_pmtu; | |
1498 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1499 | } | |
1500 | dst->metrics[RTAX_MTU-1] = mtu; | |
1501 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1502 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1503 | } |
1504 | } | |
1505 | ||
1506 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1507 | { | |
1508 | return NULL; | |
1509 | } | |
1510 | ||
1511 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1512 | { | |
1513 | struct rtable *rt = (struct rtable *) dst; | |
1514 | struct inet_peer *peer = rt->peer; | |
1515 | struct in_device *idev = rt->idev; | |
1516 | ||
1517 | if (peer) { | |
1518 | rt->peer = NULL; | |
1519 | inet_putpeer(peer); | |
1520 | } | |
1521 | ||
1522 | if (idev) { | |
1523 | rt->idev = NULL; | |
1524 | in_dev_put(idev); | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1529 | int how) | |
1530 | { | |
1531 | struct rtable *rt = (struct rtable *) dst; | |
1532 | struct in_device *idev = rt->idev; | |
c346dca1 | 1533 | if (dev != dev_net(dev)->loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 | 1534 | struct in_device *loopback_idev = |
c346dca1 | 1535 | in_dev_get(dev_net(dev)->loopback_dev); |
1da177e4 LT |
1536 | if (loopback_idev) { |
1537 | rt->idev = loopback_idev; | |
1538 | in_dev_put(idev); | |
1539 | } | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | static void ipv4_link_failure(struct sk_buff *skb) | |
1544 | { | |
1545 | struct rtable *rt; | |
1546 | ||
1547 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1548 | ||
ee6b9673 | 1549 | rt = skb->rtable; |
1da177e4 LT |
1550 | if (rt) |
1551 | dst_set_expires(&rt->u.dst, 0); | |
1552 | } | |
1553 | ||
1554 | static int ip_rt_bug(struct sk_buff *skb) | |
1555 | { | |
a7d632b6 | 1556 | printk(KERN_DEBUG "ip_rt_bug: " NIPQUAD_FMT " -> " NIPQUAD_FMT ", %s\n", |
eddc9ec5 | 1557 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
1da177e4 LT |
1558 | skb->dev ? skb->dev->name : "?"); |
1559 | kfree_skb(skb); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | We do not cache source address of outgoing interface, | |
1565 | because it is used only by IP RR, TS and SRR options, | |
1566 | so that it out of fast path. | |
1567 | ||
1568 | BTW remember: "addr" is allowed to be not aligned | |
1569 | in IP options! | |
1570 | */ | |
1571 | ||
1572 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1573 | { | |
a61ced5d | 1574 | __be32 src; |
1da177e4 LT |
1575 | struct fib_result res; |
1576 | ||
1577 | if (rt->fl.iif == 0) | |
1578 | src = rt->rt_src; | |
c346dca1 | 1579 | else if (fib_lookup(dev_net(rt->u.dst.dev), &rt->fl, &res) == 0) { |
1da177e4 LT |
1580 | src = FIB_RES_PREFSRC(res); |
1581 | fib_res_put(&res); | |
1582 | } else | |
1583 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1584 | RT_SCOPE_UNIVERSE); | |
1585 | memcpy(addr, &src, 4); | |
1586 | } | |
1587 | ||
1588 | #ifdef CONFIG_NET_CLS_ROUTE | |
1589 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1590 | { | |
1591 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1592 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1593 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1594 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1595 | } | |
1596 | #endif | |
1597 | ||
1598 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1599 | { | |
1600 | struct fib_info *fi = res->fi; | |
1601 | ||
1602 | if (fi) { | |
1603 | if (FIB_RES_GW(*res) && | |
1604 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1605 | rt->rt_gateway = FIB_RES_GW(*res); | |
1606 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1607 | sizeof(rt->u.dst.metrics)); | |
1608 | if (fi->fib_mtu == 0) { | |
1609 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
1610 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && | |
1611 | rt->rt_gateway != rt->rt_dst && | |
1612 | rt->u.dst.dev->mtu > 576) | |
1613 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1614 | } | |
1615 | #ifdef CONFIG_NET_CLS_ROUTE | |
1616 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1617 | #endif | |
1618 | } else | |
1619 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1620 | ||
1621 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1622 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; | |
1623 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) | |
1624 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; | |
1625 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) | |
1626 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, | |
1627 | ip_rt_min_advmss); | |
1628 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) | |
1629 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; | |
1630 | ||
1631 | #ifdef CONFIG_NET_CLS_ROUTE | |
1632 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1633 | set_class_tag(rt, fib_rules_tclass(res)); | |
1634 | #endif | |
1635 | set_class_tag(rt, itag); | |
1636 | #endif | |
e905a9ed | 1637 | rt->rt_type = res->type; |
1da177e4 LT |
1638 | } |
1639 | ||
9e12bb22 | 1640 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1641 | u8 tos, struct net_device *dev, int our) |
1642 | { | |
1643 | unsigned hash; | |
1644 | struct rtable *rth; | |
a61ced5d | 1645 | __be32 spec_dst; |
1da177e4 LT |
1646 | struct in_device *in_dev = in_dev_get(dev); |
1647 | u32 itag = 0; | |
1648 | ||
1649 | /* Primary sanity checks. */ | |
1650 | ||
1651 | if (in_dev == NULL) | |
1652 | return -EINVAL; | |
1653 | ||
1e637c74 | 1654 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1655 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1656 | goto e_inval; |
1657 | ||
f97c1e0c JP |
1658 | if (ipv4_is_zeronet(saddr)) { |
1659 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1660 | goto e_inval; |
1661 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1662 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1663 | dev, &spec_dst, &itag) < 0) | |
1664 | goto e_inval; | |
1665 | ||
1666 | rth = dst_alloc(&ipv4_dst_ops); | |
1667 | if (!rth) | |
1668 | goto e_nobufs; | |
1669 | ||
1670 | rth->u.dst.output= ip_rt_bug; | |
1671 | ||
1672 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1673 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1674 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1675 | rth->u.dst.flags |= DST_NOPOLICY; |
1676 | rth->fl.fl4_dst = daddr; | |
1677 | rth->rt_dst = daddr; | |
1678 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1679 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1680 | rth->fl.fl4_src = saddr; |
1681 | rth->rt_src = saddr; | |
1682 | #ifdef CONFIG_NET_CLS_ROUTE | |
1683 | rth->u.dst.tclassid = itag; | |
1684 | #endif | |
1685 | rth->rt_iif = | |
1686 | rth->fl.iif = dev->ifindex; | |
2774c7ab | 1687 | rth->u.dst.dev = init_net.loopback_dev; |
1da177e4 LT |
1688 | dev_hold(rth->u.dst.dev); |
1689 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1690 | rth->fl.oif = 0; | |
1691 | rth->rt_gateway = daddr; | |
1692 | rth->rt_spec_dst= spec_dst; | |
29e75252 | 1693 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 | 1694 | rth->rt_flags = RTCF_MULTICAST; |
29e75252 | 1695 | rth->rt_type = RTN_MULTICAST; |
1da177e4 LT |
1696 | if (our) { |
1697 | rth->u.dst.input= ip_local_deliver; | |
1698 | rth->rt_flags |= RTCF_LOCAL; | |
1699 | } | |
1700 | ||
1701 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1702 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
1da177e4 LT |
1703 | rth->u.dst.input = ip_mr_input; |
1704 | #endif | |
1705 | RT_CACHE_STAT_INC(in_slow_mc); | |
1706 | ||
1707 | in_dev_put(in_dev); | |
8c7bc840 | 1708 | hash = rt_hash(daddr, saddr, dev->ifindex); |
ee6b9673 | 1709 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1710 | |
1711 | e_nobufs: | |
1712 | in_dev_put(in_dev); | |
1713 | return -ENOBUFS; | |
1714 | ||
1715 | e_inval: | |
1716 | in_dev_put(in_dev); | |
1717 | return -EINVAL; | |
1718 | } | |
1719 | ||
1720 | ||
1721 | static void ip_handle_martian_source(struct net_device *dev, | |
1722 | struct in_device *in_dev, | |
1723 | struct sk_buff *skb, | |
9e12bb22 AV |
1724 | __be32 daddr, |
1725 | __be32 saddr) | |
1da177e4 LT |
1726 | { |
1727 | RT_CACHE_STAT_INC(in_martian_src); | |
1728 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1729 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1730 | /* | |
1731 | * RFC1812 recommendation, if source is martian, | |
1732 | * the only hint is MAC header. | |
1733 | */ | |
a7d632b6 YH |
1734 | printk(KERN_WARNING "martian source " NIPQUAD_FMT " from " |
1735 | NIPQUAD_FMT", on dev %s\n", | |
1da177e4 | 1736 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
98e399f8 | 1737 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1738 | int i; |
98e399f8 | 1739 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1740 | printk(KERN_WARNING "ll header: "); |
1741 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1742 | printk("%02x", *p); | |
1743 | if (i < (dev->hard_header_len - 1)) | |
1744 | printk(":"); | |
1745 | } | |
1746 | printk("\n"); | |
1747 | } | |
1748 | } | |
1749 | #endif | |
1750 | } | |
1751 | ||
5969f71d SH |
1752 | static int __mkroute_input(struct sk_buff *skb, |
1753 | struct fib_result *res, | |
1754 | struct in_device *in_dev, | |
1755 | __be32 daddr, __be32 saddr, u32 tos, | |
1756 | struct rtable **result) | |
1da177e4 LT |
1757 | { |
1758 | ||
1759 | struct rtable *rth; | |
1760 | int err; | |
1761 | struct in_device *out_dev; | |
1762 | unsigned flags = 0; | |
d9c9df8c AV |
1763 | __be32 spec_dst; |
1764 | u32 itag; | |
1da177e4 LT |
1765 | |
1766 | /* get a working reference to the output device */ | |
1767 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1768 | if (out_dev == NULL) { | |
1769 | if (net_ratelimit()) | |
1770 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1771 | "_slow(). Please, report\n"); | |
1772 | return -EINVAL; | |
1773 | } | |
1774 | ||
1775 | ||
e905a9ed | 1776 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1777 | in_dev->dev, &spec_dst, &itag); |
1778 | if (err < 0) { | |
e905a9ed | 1779 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1780 | saddr); |
e905a9ed | 1781 | |
1da177e4 LT |
1782 | err = -EINVAL; |
1783 | goto cleanup; | |
1784 | } | |
1785 | ||
1786 | if (err) | |
1787 | flags |= RTCF_DIRECTSRC; | |
1788 | ||
cb7928a5 | 1789 | if (out_dev == in_dev && err && !(flags & RTCF_MASQ) && |
1da177e4 LT |
1790 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1791 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1792 | flags |= RTCF_DOREDIRECT; | |
1793 | ||
1794 | if (skb->protocol != htons(ETH_P_IP)) { | |
1795 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1796 | * invalid for proxy arp. DNAT routes are always valid. | |
1797 | */ | |
cb7928a5 | 1798 | if (out_dev == in_dev) { |
1da177e4 LT |
1799 | err = -EINVAL; |
1800 | goto cleanup; | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | ||
1805 | rth = dst_alloc(&ipv4_dst_ops); | |
1806 | if (!rth) { | |
1807 | err = -ENOBUFS; | |
1808 | goto cleanup; | |
1809 | } | |
1810 | ||
ce723d8e | 1811 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1812 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1813 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1814 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1815 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1816 | rth->u.dst.flags |= DST_NOXFRM; |
1817 | rth->fl.fl4_dst = daddr; | |
1818 | rth->rt_dst = daddr; | |
1819 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1820 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1821 | rth->fl.fl4_src = saddr; |
1822 | rth->rt_src = saddr; | |
1823 | rth->rt_gateway = daddr; | |
1824 | rth->rt_iif = | |
1825 | rth->fl.iif = in_dev->dev->ifindex; | |
1826 | rth->u.dst.dev = (out_dev)->dev; | |
1827 | dev_hold(rth->u.dst.dev); | |
1828 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1829 | rth->fl.oif = 0; | |
1830 | rth->rt_spec_dst= spec_dst; | |
1831 | ||
1832 | rth->u.dst.input = ip_forward; | |
1833 | rth->u.dst.output = ip_output; | |
29e75252 | 1834 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1835 | |
1836 | rt_set_nexthop(rth, res, itag); | |
1837 | ||
1838 | rth->rt_flags = flags; | |
1839 | ||
1840 | *result = rth; | |
1841 | err = 0; | |
1842 | cleanup: | |
1843 | /* release the working reference to the output device */ | |
1844 | in_dev_put(out_dev); | |
1845 | return err; | |
e905a9ed | 1846 | } |
1da177e4 | 1847 | |
5969f71d SH |
1848 | static int ip_mkroute_input(struct sk_buff *skb, |
1849 | struct fib_result *res, | |
1850 | const struct flowi *fl, | |
1851 | struct in_device *in_dev, | |
1852 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1853 | { |
7abaa27c | 1854 | struct rtable* rth = NULL; |
1da177e4 LT |
1855 | int err; |
1856 | unsigned hash; | |
1857 | ||
1858 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1859 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
1860 | fib_select_multipath(fl, res); | |
1861 | #endif | |
1862 | ||
1863 | /* create a routing cache entry */ | |
1864 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1865 | if (err) | |
1866 | return err; | |
1da177e4 LT |
1867 | |
1868 | /* put it into the cache */ | |
8c7bc840 | 1869 | hash = rt_hash(daddr, saddr, fl->iif); |
ee6b9673 | 1870 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1871 | } |
1872 | ||
1da177e4 LT |
1873 | /* |
1874 | * NOTE. We drop all the packets that has local source | |
1875 | * addresses, because every properly looped back packet | |
1876 | * must have correct destination already attached by output routine. | |
1877 | * | |
1878 | * Such approach solves two big problems: | |
1879 | * 1. Not simplex devices are handled properly. | |
1880 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
1881 | */ | |
1882 | ||
9e12bb22 | 1883 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1884 | u8 tos, struct net_device *dev) |
1885 | { | |
1886 | struct fib_result res; | |
1887 | struct in_device *in_dev = in_dev_get(dev); | |
1888 | struct flowi fl = { .nl_u = { .ip4_u = | |
1889 | { .daddr = daddr, | |
1890 | .saddr = saddr, | |
1891 | .tos = tos, | |
1892 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1893 | } }, |
47dcf0cb | 1894 | .mark = skb->mark, |
1da177e4 LT |
1895 | .iif = dev->ifindex }; |
1896 | unsigned flags = 0; | |
1897 | u32 itag = 0; | |
1898 | struct rtable * rth; | |
1899 | unsigned hash; | |
9e12bb22 | 1900 | __be32 spec_dst; |
1da177e4 LT |
1901 | int err = -EINVAL; |
1902 | int free_res = 0; | |
c346dca1 | 1903 | struct net * net = dev_net(dev); |
1da177e4 LT |
1904 | |
1905 | /* IP on this device is disabled. */ | |
1906 | ||
1907 | if (!in_dev) | |
1908 | goto out; | |
1909 | ||
1910 | /* Check for the most weird martians, which can be not detected | |
1911 | by fib_lookup. | |
1912 | */ | |
1913 | ||
1e637c74 | 1914 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1915 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
1916 | goto martian_source; |
1917 | ||
e448515c | 1918 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1919 | goto brd_input; |
1920 | ||
1921 | /* Accept zero addresses only to limited broadcast; | |
1922 | * I even do not know to fix it or not. Waiting for complains :-) | |
1923 | */ | |
f97c1e0c | 1924 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1925 | goto martian_source; |
1926 | ||
1e637c74 | 1927 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
f97c1e0c | 1928 | ipv4_is_loopback(daddr)) |
1da177e4 LT |
1929 | goto martian_destination; |
1930 | ||
1931 | /* | |
1932 | * Now we are ready to route packet. | |
1933 | */ | |
84a885f4 | 1934 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
1da177e4 | 1935 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 1936 | goto e_hostunreach; |
1da177e4 LT |
1937 | goto no_route; |
1938 | } | |
1939 | free_res = 1; | |
1940 | ||
1941 | RT_CACHE_STAT_INC(in_slow_tot); | |
1942 | ||
1943 | if (res.type == RTN_BROADCAST) | |
1944 | goto brd_input; | |
1945 | ||
1946 | if (res.type == RTN_LOCAL) { | |
1947 | int result; | |
1948 | result = fib_validate_source(saddr, daddr, tos, | |
84a885f4 | 1949 | net->loopback_dev->ifindex, |
1da177e4 LT |
1950 | dev, &spec_dst, &itag); |
1951 | if (result < 0) | |
1952 | goto martian_source; | |
1953 | if (result) | |
1954 | flags |= RTCF_DIRECTSRC; | |
1955 | spec_dst = daddr; | |
1956 | goto local_input; | |
1957 | } | |
1958 | ||
1959 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 1960 | goto e_hostunreach; |
1da177e4 LT |
1961 | if (res.type != RTN_UNICAST) |
1962 | goto martian_destination; | |
1963 | ||
1964 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1da177e4 LT |
1965 | done: |
1966 | in_dev_put(in_dev); | |
1967 | if (free_res) | |
1968 | fib_res_put(&res); | |
1969 | out: return err; | |
1970 | ||
1971 | brd_input: | |
1972 | if (skb->protocol != htons(ETH_P_IP)) | |
1973 | goto e_inval; | |
1974 | ||
f97c1e0c | 1975 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1976 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
1977 | else { | |
1978 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
1979 | &itag); | |
1980 | if (err < 0) | |
1981 | goto martian_source; | |
1982 | if (err) | |
1983 | flags |= RTCF_DIRECTSRC; | |
1984 | } | |
1985 | flags |= RTCF_BROADCAST; | |
1986 | res.type = RTN_BROADCAST; | |
1987 | RT_CACHE_STAT_INC(in_brd); | |
1988 | ||
1989 | local_input: | |
1990 | rth = dst_alloc(&ipv4_dst_ops); | |
1991 | if (!rth) | |
1992 | goto e_nobufs; | |
1993 | ||
1994 | rth->u.dst.output= ip_rt_bug; | |
29e75252 | 1995 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
1996 | |
1997 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1998 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1999 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2000 | rth->u.dst.flags |= DST_NOPOLICY; |
2001 | rth->fl.fl4_dst = daddr; | |
2002 | rth->rt_dst = daddr; | |
2003 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 2004 | rth->fl.mark = skb->mark; |
1da177e4 LT |
2005 | rth->fl.fl4_src = saddr; |
2006 | rth->rt_src = saddr; | |
2007 | #ifdef CONFIG_NET_CLS_ROUTE | |
2008 | rth->u.dst.tclassid = itag; | |
2009 | #endif | |
2010 | rth->rt_iif = | |
2011 | rth->fl.iif = dev->ifindex; | |
84a885f4 | 2012 | rth->u.dst.dev = net->loopback_dev; |
1da177e4 LT |
2013 | dev_hold(rth->u.dst.dev); |
2014 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2015 | rth->rt_gateway = daddr; | |
2016 | rth->rt_spec_dst= spec_dst; | |
2017 | rth->u.dst.input= ip_local_deliver; | |
2018 | rth->rt_flags = flags|RTCF_LOCAL; | |
2019 | if (res.type == RTN_UNREACHABLE) { | |
2020 | rth->u.dst.input= ip_error; | |
2021 | rth->u.dst.error= -err; | |
2022 | rth->rt_flags &= ~RTCF_LOCAL; | |
2023 | } | |
2024 | rth->rt_type = res.type; | |
8c7bc840 | 2025 | hash = rt_hash(daddr, saddr, fl.iif); |
ee6b9673 | 2026 | err = rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2027 | goto done; |
2028 | ||
2029 | no_route: | |
2030 | RT_CACHE_STAT_INC(in_no_route); | |
2031 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2032 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2033 | if (err == -ESRCH) |
2034 | err = -ENETUNREACH; | |
1da177e4 LT |
2035 | goto local_input; |
2036 | ||
2037 | /* | |
2038 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2039 | */ | |
2040 | martian_destination: | |
2041 | RT_CACHE_STAT_INC(in_martian_dst); | |
2042 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2043 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
a7d632b6 YH |
2044 | printk(KERN_WARNING "martian destination " NIPQUAD_FMT " from " |
2045 | NIPQUAD_FMT ", dev %s\n", | |
1da177e4 LT |
2046 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
2047 | #endif | |
2c2910a4 DE |
2048 | |
2049 | e_hostunreach: | |
e905a9ed YH |
2050 | err = -EHOSTUNREACH; |
2051 | goto done; | |
2c2910a4 | 2052 | |
1da177e4 LT |
2053 | e_inval: |
2054 | err = -EINVAL; | |
2055 | goto done; | |
2056 | ||
2057 | e_nobufs: | |
2058 | err = -ENOBUFS; | |
2059 | goto done; | |
2060 | ||
2061 | martian_source: | |
2062 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2063 | goto e_inval; | |
2064 | } | |
2065 | ||
9e12bb22 | 2066 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2067 | u8 tos, struct net_device *dev) |
2068 | { | |
2069 | struct rtable * rth; | |
2070 | unsigned hash; | |
2071 | int iif = dev->ifindex; | |
b5921910 | 2072 | struct net *net; |
1da177e4 | 2073 | |
c346dca1 | 2074 | net = dev_net(dev); |
1da177e4 | 2075 | tos &= IPTOS_RT_MASK; |
8c7bc840 | 2076 | hash = rt_hash(daddr, saddr, iif); |
1da177e4 LT |
2077 | |
2078 | rcu_read_lock(); | |
2079 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2080 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
c0b8c32b SH |
2081 | if (((rth->fl.fl4_dst ^ daddr) | |
2082 | (rth->fl.fl4_src ^ saddr) | | |
2083 | (rth->fl.iif ^ iif) | | |
2084 | rth->fl.oif | | |
2085 | (rth->fl.fl4_tos ^ tos)) == 0 && | |
47dcf0cb | 2086 | rth->fl.mark == skb->mark && |
878628fb | 2087 | net_eq(dev_net(rth->u.dst.dev), net) && |
29e75252 | 2088 | rth->rt_genid == atomic_read(&rt_genid)) { |
03f49f34 | 2089 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2090 | RT_CACHE_STAT_INC(in_hit); |
2091 | rcu_read_unlock(); | |
ee6b9673 | 2092 | skb->rtable = rth; |
1da177e4 LT |
2093 | return 0; |
2094 | } | |
2095 | RT_CACHE_STAT_INC(in_hlist_search); | |
2096 | } | |
2097 | rcu_read_unlock(); | |
2098 | ||
2099 | /* Multicast recognition logic is moved from route cache to here. | |
2100 | The problem was that too many Ethernet cards have broken/missing | |
2101 | hardware multicast filters :-( As result the host on multicasting | |
2102 | network acquires a lot of useless route cache entries, sort of | |
2103 | SDR messages from all the world. Now we try to get rid of them. | |
2104 | Really, provided software IP multicast filter is organized | |
2105 | reasonably (at least, hashed), it does not result in a slowdown | |
2106 | comparing with route cache reject entries. | |
2107 | Note, that multicast routers are not affected, because | |
2108 | route cache entry is created eventually. | |
2109 | */ | |
f97c1e0c | 2110 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
2111 | struct in_device *in_dev; |
2112 | ||
2113 | rcu_read_lock(); | |
e5ed6399 | 2114 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 2115 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 2116 | ip_hdr(skb)->protocol); |
1da177e4 LT |
2117 | if (our |
2118 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c JP |
2119 | || (!ipv4_is_local_multicast(daddr) && |
2120 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 LT |
2121 | #endif |
2122 | ) { | |
2123 | rcu_read_unlock(); | |
2124 | return ip_route_input_mc(skb, daddr, saddr, | |
2125 | tos, dev, our); | |
2126 | } | |
2127 | } | |
2128 | rcu_read_unlock(); | |
2129 | return -EINVAL; | |
2130 | } | |
2131 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2132 | } | |
2133 | ||
5969f71d SH |
2134 | static int __mkroute_output(struct rtable **result, |
2135 | struct fib_result *res, | |
2136 | const struct flowi *fl, | |
2137 | const struct flowi *oldflp, | |
2138 | struct net_device *dev_out, | |
2139 | unsigned flags) | |
1da177e4 LT |
2140 | { |
2141 | struct rtable *rth; | |
2142 | struct in_device *in_dev; | |
2143 | u32 tos = RT_FL_TOS(oldflp); | |
2144 | int err = 0; | |
2145 | ||
f97c1e0c | 2146 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
1da177e4 LT |
2147 | return -EINVAL; |
2148 | ||
e448515c | 2149 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 | 2150 | res->type = RTN_BROADCAST; |
f97c1e0c | 2151 | else if (ipv4_is_multicast(fl->fl4_dst)) |
1da177e4 | 2152 | res->type = RTN_MULTICAST; |
1e637c74 | 2153 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
1da177e4 LT |
2154 | return -EINVAL; |
2155 | ||
2156 | if (dev_out->flags & IFF_LOOPBACK) | |
2157 | flags |= RTCF_LOCAL; | |
2158 | ||
2159 | /* get work reference to inet device */ | |
2160 | in_dev = in_dev_get(dev_out); | |
2161 | if (!in_dev) | |
2162 | return -EINVAL; | |
2163 | ||
2164 | if (res->type == RTN_BROADCAST) { | |
2165 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2166 | if (res->fi) { | |
2167 | fib_info_put(res->fi); | |
2168 | res->fi = NULL; | |
2169 | } | |
2170 | } else if (res->type == RTN_MULTICAST) { | |
2171 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2172 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2173 | oldflp->proto)) |
2174 | flags &= ~RTCF_LOCAL; | |
2175 | /* If multicast route do not exist use | |
2176 | default one, but do not gateway in this case. | |
2177 | Yes, it is hack. | |
2178 | */ | |
2179 | if (res->fi && res->prefixlen < 4) { | |
2180 | fib_info_put(res->fi); | |
2181 | res->fi = NULL; | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | ||
2186 | rth = dst_alloc(&ipv4_dst_ops); | |
2187 | if (!rth) { | |
2188 | err = -ENOBUFS; | |
2189 | goto cleanup; | |
e905a9ed | 2190 | } |
1da177e4 | 2191 | |
ce723d8e | 2192 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2193 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2194 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2195 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2196 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2197 | rth->u.dst.flags |= DST_NOPOLICY; |
2198 | ||
2199 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2200 | rth->fl.fl4_tos = tos; | |
2201 | rth->fl.fl4_src = oldflp->fl4_src; | |
2202 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2203 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2204 | rth->rt_dst = fl->fl4_dst; |
2205 | rth->rt_src = fl->fl4_src; | |
2206 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2207 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2208 | cache entry */ |
2209 | rth->u.dst.dev = dev_out; | |
2210 | dev_hold(dev_out); | |
2211 | rth->idev = in_dev_get(dev_out); | |
2212 | rth->rt_gateway = fl->fl4_dst; | |
2213 | rth->rt_spec_dst= fl->fl4_src; | |
2214 | ||
2215 | rth->u.dst.output=ip_output; | |
29e75252 | 2216 | rth->rt_genid = atomic_read(&rt_genid); |
1da177e4 LT |
2217 | |
2218 | RT_CACHE_STAT_INC(out_slow_tot); | |
2219 | ||
2220 | if (flags & RTCF_LOCAL) { | |
2221 | rth->u.dst.input = ip_local_deliver; | |
2222 | rth->rt_spec_dst = fl->fl4_dst; | |
2223 | } | |
2224 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2225 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2226 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2227 | !(dev_out->flags & IFF_LOOPBACK)) { |
2228 | rth->u.dst.output = ip_mc_output; | |
2229 | RT_CACHE_STAT_INC(out_slow_mc); | |
2230 | } | |
2231 | #ifdef CONFIG_IP_MROUTE | |
2232 | if (res->type == RTN_MULTICAST) { | |
2233 | if (IN_DEV_MFORWARD(in_dev) && | |
f97c1e0c | 2234 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
1da177e4 LT |
2235 | rth->u.dst.input = ip_mr_input; |
2236 | rth->u.dst.output = ip_mc_output; | |
2237 | } | |
2238 | } | |
2239 | #endif | |
2240 | } | |
2241 | ||
2242 | rt_set_nexthop(rth, res, 0); | |
2243 | ||
2244 | rth->rt_flags = flags; | |
2245 | ||
2246 | *result = rth; | |
2247 | cleanup: | |
2248 | /* release work reference to inet device */ | |
2249 | in_dev_put(in_dev); | |
2250 | ||
2251 | return err; | |
2252 | } | |
2253 | ||
5969f71d SH |
2254 | static int ip_mkroute_output(struct rtable **rp, |
2255 | struct fib_result *res, | |
2256 | const struct flowi *fl, | |
2257 | const struct flowi *oldflp, | |
2258 | struct net_device *dev_out, | |
2259 | unsigned flags) | |
1da177e4 | 2260 | { |
7abaa27c | 2261 | struct rtable *rth = NULL; |
1da177e4 LT |
2262 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2263 | unsigned hash; | |
2264 | if (err == 0) { | |
8c7bc840 | 2265 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif); |
1da177e4 LT |
2266 | err = rt_intern_hash(hash, rth, rp); |
2267 | } | |
e905a9ed | 2268 | |
1da177e4 LT |
2269 | return err; |
2270 | } | |
2271 | ||
1da177e4 LT |
2272 | /* |
2273 | * Major route resolver routine. | |
2274 | */ | |
2275 | ||
b40afd0e DL |
2276 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
2277 | const struct flowi *oldflp) | |
1da177e4 LT |
2278 | { |
2279 | u32 tos = RT_FL_TOS(oldflp); | |
2280 | struct flowi fl = { .nl_u = { .ip4_u = | |
2281 | { .daddr = oldflp->fl4_dst, | |
2282 | .saddr = oldflp->fl4_src, | |
2283 | .tos = tos & IPTOS_RT_MASK, | |
2284 | .scope = ((tos & RTO_ONLINK) ? | |
2285 | RT_SCOPE_LINK : | |
2286 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2287 | } }, |
47dcf0cb | 2288 | .mark = oldflp->mark, |
b40afd0e | 2289 | .iif = net->loopback_dev->ifindex, |
1da177e4 LT |
2290 | .oif = oldflp->oif }; |
2291 | struct fib_result res; | |
2292 | unsigned flags = 0; | |
2293 | struct net_device *dev_out = NULL; | |
2294 | int free_res = 0; | |
2295 | int err; | |
2296 | ||
2297 | ||
2298 | res.fi = NULL; | |
2299 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2300 | res.r = NULL; | |
2301 | #endif | |
2302 | ||
2303 | if (oldflp->fl4_src) { | |
2304 | err = -EINVAL; | |
f97c1e0c | 2305 | if (ipv4_is_multicast(oldflp->fl4_src) || |
1e637c74 | 2306 | ipv4_is_lbcast(oldflp->fl4_src) || |
f97c1e0c | 2307 | ipv4_is_zeronet(oldflp->fl4_src)) |
1da177e4 LT |
2308 | goto out; |
2309 | ||
2310 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
b40afd0e | 2311 | dev_out = ip_dev_find(net, oldflp->fl4_src); |
f6c5d736 | 2312 | if (dev_out == NULL) |
1da177e4 LT |
2313 | goto out; |
2314 | ||
2315 | /* I removed check for oif == dev_out->oif here. | |
2316 | It was wrong for two reasons: | |
1ab35276 DL |
2317 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2318 | is assigned to multiple interfaces. | |
1da177e4 LT |
2319 | 2. Moreover, we are allowed to send packets with saddr |
2320 | of another iface. --ANK | |
2321 | */ | |
2322 | ||
f6c5d736 | 2323 | if (oldflp->oif == 0 |
f97c1e0c JP |
2324 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
2325 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { | |
1da177e4 LT |
2326 | /* Special hack: user can direct multicasts |
2327 | and limited broadcast via necessary interface | |
2328 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2329 | This hack is not just for fun, it allows | |
2330 | vic,vat and friends to work. | |
2331 | They bind socket to loopback, set ttl to zero | |
2332 | and expect that it will work. | |
2333 | From the viewpoint of routing cache they are broken, | |
2334 | because we are not allowed to build multicast path | |
2335 | with loopback source addr (look, routing cache | |
2336 | cannot know, that ttl is zero, so that packet | |
2337 | will not leave this host and route is valid). | |
2338 | Luckily, this hack is good workaround. | |
2339 | */ | |
2340 | ||
2341 | fl.oif = dev_out->ifindex; | |
2342 | goto make_route; | |
2343 | } | |
2344 | if (dev_out) | |
2345 | dev_put(dev_out); | |
2346 | dev_out = NULL; | |
2347 | } | |
2348 | ||
2349 | ||
2350 | if (oldflp->oif) { | |
b40afd0e | 2351 | dev_out = dev_get_by_index(net, oldflp->oif); |
1da177e4 LT |
2352 | err = -ENODEV; |
2353 | if (dev_out == NULL) | |
2354 | goto out; | |
e5ed6399 HX |
2355 | |
2356 | /* RACE: Check return value of inet_select_addr instead. */ | |
2357 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2358 | dev_put(dev_out); |
2359 | goto out; /* Wrong error code */ | |
2360 | } | |
2361 | ||
f97c1e0c JP |
2362 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
2363 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { | |
1da177e4 LT |
2364 | if (!fl.fl4_src) |
2365 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2366 | RT_SCOPE_LINK); | |
2367 | goto make_route; | |
2368 | } | |
2369 | if (!fl.fl4_src) { | |
f97c1e0c | 2370 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
1da177e4 LT |
2371 | fl.fl4_src = inet_select_addr(dev_out, 0, |
2372 | fl.fl4_scope); | |
2373 | else if (!oldflp->fl4_dst) | |
2374 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2375 | RT_SCOPE_HOST); | |
2376 | } | |
2377 | } | |
2378 | ||
2379 | if (!fl.fl4_dst) { | |
2380 | fl.fl4_dst = fl.fl4_src; | |
2381 | if (!fl.fl4_dst) | |
2382 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2383 | if (dev_out) | |
2384 | dev_put(dev_out); | |
b40afd0e | 2385 | dev_out = net->loopback_dev; |
1da177e4 | 2386 | dev_hold(dev_out); |
b40afd0e | 2387 | fl.oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2388 | res.type = RTN_LOCAL; |
2389 | flags |= RTCF_LOCAL; | |
2390 | goto make_route; | |
2391 | } | |
2392 | ||
b40afd0e | 2393 | if (fib_lookup(net, &fl, &res)) { |
1da177e4 LT |
2394 | res.fi = NULL; |
2395 | if (oldflp->oif) { | |
2396 | /* Apparently, routing tables are wrong. Assume, | |
2397 | that the destination is on link. | |
2398 | ||
2399 | WHY? DW. | |
2400 | Because we are allowed to send to iface | |
2401 | even if it has NO routes and NO assigned | |
2402 | addresses. When oif is specified, routing | |
2403 | tables are looked up with only one purpose: | |
2404 | to catch if destination is gatewayed, rather than | |
2405 | direct. Moreover, if MSG_DONTROUTE is set, | |
2406 | we send packet, ignoring both routing tables | |
2407 | and ifaddr state. --ANK | |
2408 | ||
2409 | ||
2410 | We could make it even if oif is unknown, | |
2411 | likely IPv6, but we do not. | |
2412 | */ | |
2413 | ||
2414 | if (fl.fl4_src == 0) | |
2415 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2416 | RT_SCOPE_LINK); | |
2417 | res.type = RTN_UNICAST; | |
2418 | goto make_route; | |
2419 | } | |
2420 | if (dev_out) | |
2421 | dev_put(dev_out); | |
2422 | err = -ENETUNREACH; | |
2423 | goto out; | |
2424 | } | |
2425 | free_res = 1; | |
2426 | ||
2427 | if (res.type == RTN_LOCAL) { | |
2428 | if (!fl.fl4_src) | |
2429 | fl.fl4_src = fl.fl4_dst; | |
2430 | if (dev_out) | |
2431 | dev_put(dev_out); | |
b40afd0e | 2432 | dev_out = net->loopback_dev; |
1da177e4 LT |
2433 | dev_hold(dev_out); |
2434 | fl.oif = dev_out->ifindex; | |
2435 | if (res.fi) | |
2436 | fib_info_put(res.fi); | |
2437 | res.fi = NULL; | |
2438 | flags |= RTCF_LOCAL; | |
2439 | goto make_route; | |
2440 | } | |
2441 | ||
2442 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2443 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2444 | fib_select_multipath(&fl, &res); | |
2445 | else | |
2446 | #endif | |
2447 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
b40afd0e | 2448 | fib_select_default(net, &fl, &res); |
1da177e4 LT |
2449 | |
2450 | if (!fl.fl4_src) | |
2451 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2452 | ||
2453 | if (dev_out) | |
2454 | dev_put(dev_out); | |
2455 | dev_out = FIB_RES_DEV(res); | |
2456 | dev_hold(dev_out); | |
2457 | fl.oif = dev_out->ifindex; | |
2458 | ||
2459 | ||
2460 | make_route: | |
2461 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2462 | ||
2463 | ||
2464 | if (free_res) | |
2465 | fib_res_put(&res); | |
2466 | if (dev_out) | |
2467 | dev_put(dev_out); | |
2468 | out: return err; | |
2469 | } | |
2470 | ||
611c183e DL |
2471 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
2472 | const struct flowi *flp) | |
1da177e4 LT |
2473 | { |
2474 | unsigned hash; | |
2475 | struct rtable *rth; | |
2476 | ||
8c7bc840 | 2477 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif); |
1da177e4 LT |
2478 | |
2479 | rcu_read_lock_bh(); | |
2480 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2481 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2482 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2483 | rth->fl.fl4_src == flp->fl4_src && | |
2484 | rth->fl.iif == 0 && | |
2485 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2486 | rth->fl.mark == flp->mark && |
1da177e4 | 2487 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
b5921910 | 2488 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
878628fb | 2489 | net_eq(dev_net(rth->u.dst.dev), net) && |
29e75252 | 2490 | rth->rt_genid == atomic_read(&rt_genid)) { |
03f49f34 | 2491 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2492 | RT_CACHE_STAT_INC(out_hit); |
2493 | rcu_read_unlock_bh(); | |
2494 | *rp = rth; | |
2495 | return 0; | |
2496 | } | |
2497 | RT_CACHE_STAT_INC(out_hlist_search); | |
2498 | } | |
2499 | rcu_read_unlock_bh(); | |
2500 | ||
611c183e | 2501 | return ip_route_output_slow(net, rp, flp); |
1da177e4 LT |
2502 | } |
2503 | ||
d8c97a94 ACM |
2504 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2505 | ||
14e50e57 DM |
2506 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2507 | { | |
2508 | } | |
2509 | ||
2510 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2511 | .family = AF_INET, | |
2512 | .protocol = __constant_htons(ETH_P_IP), | |
2513 | .destroy = ipv4_dst_destroy, | |
2514 | .check = ipv4_dst_check, | |
2515 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
2516 | .entry_size = sizeof(struct rtable), | |
e2422970 | 2517 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
2518 | }; |
2519 | ||
2520 | ||
ce259990 | 2521 | static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp) |
14e50e57 DM |
2522 | { |
2523 | struct rtable *ort = *rp; | |
2524 | struct rtable *rt = (struct rtable *) | |
2525 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2526 | ||
2527 | if (rt) { | |
2528 | struct dst_entry *new = &rt->u.dst; | |
2529 | ||
2530 | atomic_set(&new->__refcnt, 1); | |
2531 | new->__use = 1; | |
352e512c HX |
2532 | new->input = dst_discard; |
2533 | new->output = dst_discard; | |
14e50e57 DM |
2534 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
2535 | ||
2536 | new->dev = ort->u.dst.dev; | |
2537 | if (new->dev) | |
2538 | dev_hold(new->dev); | |
2539 | ||
2540 | rt->fl = ort->fl; | |
2541 | ||
2542 | rt->idev = ort->idev; | |
2543 | if (rt->idev) | |
2544 | in_dev_hold(rt->idev); | |
29e75252 | 2545 | rt->rt_genid = atomic_read(&rt_genid); |
14e50e57 DM |
2546 | rt->rt_flags = ort->rt_flags; |
2547 | rt->rt_type = ort->rt_type; | |
2548 | rt->rt_dst = ort->rt_dst; | |
2549 | rt->rt_src = ort->rt_src; | |
2550 | rt->rt_iif = ort->rt_iif; | |
2551 | rt->rt_gateway = ort->rt_gateway; | |
2552 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2553 | rt->peer = ort->peer; | |
2554 | if (rt->peer) | |
2555 | atomic_inc(&rt->peer->refcnt); | |
2556 | ||
2557 | dst_free(new); | |
2558 | } | |
2559 | ||
2560 | dst_release(&(*rp)->u.dst); | |
2561 | *rp = rt; | |
2562 | return (rt ? 0 : -ENOMEM); | |
2563 | } | |
2564 | ||
f1b050bf DL |
2565 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
2566 | struct sock *sk, int flags) | |
1da177e4 LT |
2567 | { |
2568 | int err; | |
2569 | ||
f1b050bf | 2570 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
1da177e4 LT |
2571 | return err; |
2572 | ||
2573 | if (flp->proto) { | |
2574 | if (!flp->fl4_src) | |
2575 | flp->fl4_src = (*rp)->rt_src; | |
2576 | if (!flp->fl4_dst) | |
2577 | flp->fl4_dst = (*rp)->rt_dst; | |
bb72845e HX |
2578 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, |
2579 | flags ? XFRM_LOOKUP_WAIT : 0); | |
14e50e57 | 2580 | if (err == -EREMOTE) |
ce259990 | 2581 | err = ipv4_dst_blackhole(rp, flp); |
14e50e57 DM |
2582 | |
2583 | return err; | |
1da177e4 LT |
2584 | } |
2585 | ||
2586 | return 0; | |
2587 | } | |
2588 | ||
d8c97a94 ACM |
2589 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2590 | ||
f206351a | 2591 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
1da177e4 | 2592 | { |
f206351a | 2593 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
1da177e4 LT |
2594 | } |
2595 | ||
2596 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2597 | int nowait, unsigned int flags) |
1da177e4 | 2598 | { |
ee6b9673 | 2599 | struct rtable *rt = skb->rtable; |
1da177e4 | 2600 | struct rtmsg *r; |
be403ea1 | 2601 | struct nlmsghdr *nlh; |
e3703b3d TG |
2602 | long expires; |
2603 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2604 | |
2605 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2606 | if (nlh == NULL) | |
26932566 | 2607 | return -EMSGSIZE; |
be403ea1 TG |
2608 | |
2609 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2610 | r->rtm_family = AF_INET; |
2611 | r->rtm_dst_len = 32; | |
2612 | r->rtm_src_len = 0; | |
2613 | r->rtm_tos = rt->fl.fl4_tos; | |
2614 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2615 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2616 | r->rtm_type = rt->rt_type; |
2617 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2618 | r->rtm_protocol = RTPROT_UNSPEC; | |
2619 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2620 | if (rt->rt_flags & RTCF_NOTIFY) | |
2621 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2622 | |
17fb2c64 | 2623 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2624 | |
1da177e4 LT |
2625 | if (rt->fl.fl4_src) { |
2626 | r->rtm_src_len = 32; | |
17fb2c64 | 2627 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2628 | } |
2629 | if (rt->u.dst.dev) | |
be403ea1 | 2630 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2631 | #ifdef CONFIG_NET_CLS_ROUTE |
2632 | if (rt->u.dst.tclassid) | |
be403ea1 | 2633 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2634 | #endif |
2635 | if (rt->fl.iif) | |
17fb2c64 | 2636 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2637 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2638 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2639 | |
1da177e4 | 2640 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2641 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2642 | |
1da177e4 | 2643 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2644 | goto nla_put_failure; |
2645 | ||
e3703b3d TG |
2646 | error = rt->u.dst.error; |
2647 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2648 | if (rt->peer) { |
e3703b3d | 2649 | id = rt->peer->ip_id_count; |
1da177e4 | 2650 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2651 | ts = rt->peer->tcp_ts; |
9d729f72 | 2652 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2653 | } |
2654 | } | |
be403ea1 | 2655 | |
1da177e4 LT |
2656 | if (rt->fl.iif) { |
2657 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2658 | __be32 dst = rt->rt_dst; |
1da177e4 | 2659 | |
f97c1e0c | 2660 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
586f1211 | 2661 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
1da177e4 LT |
2662 | int err = ipmr_get_route(skb, r, nowait); |
2663 | if (err <= 0) { | |
2664 | if (!nowait) { | |
2665 | if (err == 0) | |
2666 | return 0; | |
be403ea1 | 2667 | goto nla_put_failure; |
1da177e4 LT |
2668 | } else { |
2669 | if (err == -EMSGSIZE) | |
be403ea1 | 2670 | goto nla_put_failure; |
e3703b3d | 2671 | error = err; |
1da177e4 LT |
2672 | } |
2673 | } | |
2674 | } else | |
2675 | #endif | |
be403ea1 | 2676 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2677 | } |
2678 | ||
e3703b3d TG |
2679 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2680 | expires, error) < 0) | |
2681 | goto nla_put_failure; | |
be403ea1 TG |
2682 | |
2683 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2684 | |
be403ea1 | 2685 | nla_put_failure: |
26932566 PM |
2686 | nlmsg_cancel(skb, nlh); |
2687 | return -EMSGSIZE; | |
1da177e4 LT |
2688 | } |
2689 | ||
63f3444f | 2690 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2691 | { |
3b1e0a65 | 2692 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2693 | struct rtmsg *rtm; |
2694 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2695 | struct rtable *rt = NULL; |
9e12bb22 AV |
2696 | __be32 dst = 0; |
2697 | __be32 src = 0; | |
2698 | u32 iif; | |
d889ce3b | 2699 | int err; |
1da177e4 LT |
2700 | struct sk_buff *skb; |
2701 | ||
d889ce3b TG |
2702 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2703 | if (err < 0) | |
2704 | goto errout; | |
2705 | ||
2706 | rtm = nlmsg_data(nlh); | |
2707 | ||
1da177e4 | 2708 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2709 | if (skb == NULL) { |
2710 | err = -ENOBUFS; | |
2711 | goto errout; | |
2712 | } | |
1da177e4 LT |
2713 | |
2714 | /* Reserve room for dummy headers, this skb can pass | |
2715 | through good chunk of routing engine. | |
2716 | */ | |
459a98ed | 2717 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2718 | skb_reset_network_header(skb); |
d2c962b8 SH |
2719 | |
2720 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2721 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2722 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2723 | ||
17fb2c64 AV |
2724 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2725 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2726 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2727 | |
2728 | if (iif) { | |
d889ce3b TG |
2729 | struct net_device *dev; |
2730 | ||
1937504d | 2731 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2732 | if (dev == NULL) { |
2733 | err = -ENODEV; | |
2734 | goto errout_free; | |
2735 | } | |
2736 | ||
1da177e4 LT |
2737 | skb->protocol = htons(ETH_P_IP); |
2738 | skb->dev = dev; | |
2739 | local_bh_disable(); | |
2740 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2741 | local_bh_enable(); | |
d889ce3b | 2742 | |
ee6b9673 | 2743 | rt = skb->rtable; |
d889ce3b | 2744 | if (err == 0 && rt->u.dst.error) |
1da177e4 LT |
2745 | err = -rt->u.dst.error; |
2746 | } else { | |
d889ce3b TG |
2747 | struct flowi fl = { |
2748 | .nl_u = { | |
2749 | .ip4_u = { | |
2750 | .daddr = dst, | |
2751 | .saddr = src, | |
2752 | .tos = rtm->rtm_tos, | |
2753 | }, | |
2754 | }, | |
2755 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2756 | }; | |
1937504d | 2757 | err = ip_route_output_key(net, &rt, &fl); |
1da177e4 | 2758 | } |
d889ce3b | 2759 | |
1da177e4 | 2760 | if (err) |
d889ce3b | 2761 | goto errout_free; |
1da177e4 | 2762 | |
ee6b9673 | 2763 | skb->rtable = rt; |
1da177e4 LT |
2764 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2765 | rt->rt_flags |= RTCF_NOTIFY; | |
2766 | ||
1da177e4 | 2767 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2768 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2769 | if (err <= 0) |
2770 | goto errout_free; | |
1da177e4 | 2771 | |
1937504d | 2772 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2773 | errout: |
2942e900 | 2774 | return err; |
1da177e4 | 2775 | |
d889ce3b | 2776 | errout_free: |
1da177e4 | 2777 | kfree_skb(skb); |
d889ce3b | 2778 | goto errout; |
1da177e4 LT |
2779 | } |
2780 | ||
2781 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2782 | { | |
2783 | struct rtable *rt; | |
2784 | int h, s_h; | |
2785 | int idx, s_idx; | |
1937504d DL |
2786 | struct net *net; |
2787 | ||
3b1e0a65 | 2788 | net = sock_net(skb->sk); |
1da177e4 LT |
2789 | |
2790 | s_h = cb->args[0]; | |
d8c92830 ED |
2791 | if (s_h < 0) |
2792 | s_h = 0; | |
1da177e4 | 2793 | s_idx = idx = cb->args[1]; |
d8c92830 | 2794 | for (h = s_h; h <= rt_hash_mask; h++) { |
1da177e4 LT |
2795 | rcu_read_lock_bh(); |
2796 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2797 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
878628fb | 2798 | if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx) |
1da177e4 | 2799 | continue; |
29e75252 ED |
2800 | if (rt->rt_genid != atomic_read(&rt_genid)) |
2801 | continue; | |
1da177e4 LT |
2802 | skb->dst = dst_clone(&rt->u.dst); |
2803 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 2804 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2805 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
2806 | dst_release(xchg(&skb->dst, NULL)); |
2807 | rcu_read_unlock_bh(); | |
2808 | goto done; | |
2809 | } | |
2810 | dst_release(xchg(&skb->dst, NULL)); | |
2811 | } | |
2812 | rcu_read_unlock_bh(); | |
d8c92830 | 2813 | s_idx = 0; |
1da177e4 LT |
2814 | } |
2815 | ||
2816 | done: | |
2817 | cb->args[0] = h; | |
2818 | cb->args[1] = idx; | |
2819 | return skb->len; | |
2820 | } | |
2821 | ||
2822 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2823 | { | |
2824 | rt_cache_flush(0); | |
2825 | } | |
2826 | ||
2827 | #ifdef CONFIG_SYSCTL | |
2828 | static int flush_delay; | |
2829 | ||
2830 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, | |
2831 | struct file *filp, void __user *buffer, | |
2832 | size_t *lenp, loff_t *ppos) | |
2833 | { | |
2834 | if (write) { | |
2835 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2836 | rt_cache_flush(flush_delay); | |
2837 | return 0; | |
e905a9ed | 2838 | } |
1da177e4 LT |
2839 | |
2840 | return -EINVAL; | |
2841 | } | |
2842 | ||
2843 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
2844 | int __user *name, | |
2845 | int nlen, | |
2846 | void __user *oldval, | |
2847 | size_t __user *oldlenp, | |
2848 | void __user *newval, | |
1f29bcd7 | 2849 | size_t newlen) |
1da177e4 LT |
2850 | { |
2851 | int delay; | |
2852 | if (newlen != sizeof(int)) | |
2853 | return -EINVAL; | |
2854 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed YH |
2855 | return -EFAULT; |
2856 | rt_cache_flush(delay); | |
1da177e4 LT |
2857 | return 0; |
2858 | } | |
2859 | ||
2860 | ctl_table ipv4_route_table[] = { | |
e905a9ed | 2861 | { |
1da177e4 LT |
2862 | .ctl_name = NET_IPV4_ROUTE_FLUSH, |
2863 | .procname = "flush", | |
2864 | .data = &flush_delay, | |
2865 | .maxlen = sizeof(int), | |
7e3e0360 | 2866 | .mode = 0200, |
1da177e4 LT |
2867 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
2868 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
2869 | }, | |
1da177e4 LT |
2870 | { |
2871 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
2872 | .procname = "gc_thresh", | |
2873 | .data = &ipv4_dst_ops.gc_thresh, | |
2874 | .maxlen = sizeof(int), | |
2875 | .mode = 0644, | |
2876 | .proc_handler = &proc_dointvec, | |
2877 | }, | |
2878 | { | |
2879 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
2880 | .procname = "max_size", | |
2881 | .data = &ip_rt_max_size, | |
2882 | .maxlen = sizeof(int), | |
2883 | .mode = 0644, | |
2884 | .proc_handler = &proc_dointvec, | |
2885 | }, | |
2886 | { | |
2887 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2888 | |
1da177e4 LT |
2889 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
2890 | .procname = "gc_min_interval", | |
2891 | .data = &ip_rt_gc_min_interval, | |
2892 | .maxlen = sizeof(int), | |
2893 | .mode = 0644, | |
2894 | .proc_handler = &proc_dointvec_jiffies, | |
2895 | .strategy = &sysctl_jiffies, | |
2896 | }, | |
2897 | { | |
2898 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
2899 | .procname = "gc_min_interval_ms", | |
2900 | .data = &ip_rt_gc_min_interval, | |
2901 | .maxlen = sizeof(int), | |
2902 | .mode = 0644, | |
2903 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2904 | .strategy = &sysctl_ms_jiffies, | |
2905 | }, | |
2906 | { | |
2907 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
2908 | .procname = "gc_timeout", | |
2909 | .data = &ip_rt_gc_timeout, | |
2910 | .maxlen = sizeof(int), | |
2911 | .mode = 0644, | |
2912 | .proc_handler = &proc_dointvec_jiffies, | |
2913 | .strategy = &sysctl_jiffies, | |
2914 | }, | |
2915 | { | |
2916 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
2917 | .procname = "gc_interval", | |
2918 | .data = &ip_rt_gc_interval, | |
2919 | .maxlen = sizeof(int), | |
2920 | .mode = 0644, | |
2921 | .proc_handler = &proc_dointvec_jiffies, | |
2922 | .strategy = &sysctl_jiffies, | |
2923 | }, | |
2924 | { | |
2925 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
2926 | .procname = "redirect_load", | |
2927 | .data = &ip_rt_redirect_load, | |
2928 | .maxlen = sizeof(int), | |
2929 | .mode = 0644, | |
2930 | .proc_handler = &proc_dointvec, | |
2931 | }, | |
2932 | { | |
2933 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
2934 | .procname = "redirect_number", | |
2935 | .data = &ip_rt_redirect_number, | |
2936 | .maxlen = sizeof(int), | |
2937 | .mode = 0644, | |
2938 | .proc_handler = &proc_dointvec, | |
2939 | }, | |
2940 | { | |
2941 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
2942 | .procname = "redirect_silence", | |
2943 | .data = &ip_rt_redirect_silence, | |
2944 | .maxlen = sizeof(int), | |
2945 | .mode = 0644, | |
2946 | .proc_handler = &proc_dointvec, | |
2947 | }, | |
2948 | { | |
2949 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
2950 | .procname = "error_cost", | |
2951 | .data = &ip_rt_error_cost, | |
2952 | .maxlen = sizeof(int), | |
2953 | .mode = 0644, | |
2954 | .proc_handler = &proc_dointvec, | |
2955 | }, | |
2956 | { | |
2957 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
2958 | .procname = "error_burst", | |
2959 | .data = &ip_rt_error_burst, | |
2960 | .maxlen = sizeof(int), | |
2961 | .mode = 0644, | |
2962 | .proc_handler = &proc_dointvec, | |
2963 | }, | |
2964 | { | |
2965 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
2966 | .procname = "gc_elasticity", | |
2967 | .data = &ip_rt_gc_elasticity, | |
2968 | .maxlen = sizeof(int), | |
2969 | .mode = 0644, | |
2970 | .proc_handler = &proc_dointvec, | |
2971 | }, | |
2972 | { | |
2973 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
2974 | .procname = "mtu_expires", | |
2975 | .data = &ip_rt_mtu_expires, | |
2976 | .maxlen = sizeof(int), | |
2977 | .mode = 0644, | |
2978 | .proc_handler = &proc_dointvec_jiffies, | |
2979 | .strategy = &sysctl_jiffies, | |
2980 | }, | |
2981 | { | |
2982 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
2983 | .procname = "min_pmtu", | |
2984 | .data = &ip_rt_min_pmtu, | |
2985 | .maxlen = sizeof(int), | |
2986 | .mode = 0644, | |
2987 | .proc_handler = &proc_dointvec, | |
2988 | }, | |
2989 | { | |
2990 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
2991 | .procname = "min_adv_mss", | |
2992 | .data = &ip_rt_min_advmss, | |
2993 | .maxlen = sizeof(int), | |
2994 | .mode = 0644, | |
2995 | .proc_handler = &proc_dointvec, | |
2996 | }, | |
2997 | { | |
2998 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
2999 | .procname = "secret_interval", | |
3000 | .data = &ip_rt_secret_interval, | |
3001 | .maxlen = sizeof(int), | |
3002 | .mode = 0644, | |
3003 | .proc_handler = &proc_dointvec_jiffies, | |
3004 | .strategy = &sysctl_jiffies, | |
3005 | }, | |
3006 | { .ctl_name = 0 } | |
3007 | }; | |
3008 | #endif | |
3009 | ||
3010 | #ifdef CONFIG_NET_CLS_ROUTE | |
8dbde28d | 3011 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
1da177e4 LT |
3012 | #endif /* CONFIG_NET_CLS_ROUTE */ |
3013 | ||
3014 | static __initdata unsigned long rhash_entries; | |
3015 | static int __init set_rhash_entries(char *str) | |
3016 | { | |
3017 | if (!str) | |
3018 | return 0; | |
3019 | rhash_entries = simple_strtoul(str, &str, 0); | |
3020 | return 1; | |
3021 | } | |
3022 | __setup("rhash_entries=", set_rhash_entries); | |
3023 | ||
3024 | int __init ip_rt_init(void) | |
3025 | { | |
424c4b70 | 3026 | int rc = 0; |
1da177e4 | 3027 | |
29e75252 ED |
3028 | atomic_set(&rt_genid, (int) ((num_physpages ^ (num_physpages>>8)) ^ |
3029 | (jiffies ^ (jiffies >> 7)))); | |
1da177e4 LT |
3030 | |
3031 | #ifdef CONFIG_NET_CLS_ROUTE | |
8dbde28d | 3032 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
1da177e4 LT |
3033 | if (!ip_rt_acct) |
3034 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3035 | #endif |
3036 | ||
e5d679f3 AD |
3037 | ipv4_dst_ops.kmem_cachep = |
3038 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3039 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3040 | |
14e50e57 DM |
3041 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3042 | ||
424c4b70 ED |
3043 | rt_hash_table = (struct rt_hash_bucket *) |
3044 | alloc_large_system_hash("IP route cache", | |
3045 | sizeof(struct rt_hash_bucket), | |
3046 | rhash_entries, | |
3047 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3048 | 15 : 17, |
8d1502de | 3049 | 0, |
424c4b70 ED |
3050 | &rt_hash_log, |
3051 | &rt_hash_mask, | |
3052 | 0); | |
22c047cc ED |
3053 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3054 | rt_hash_lock_init(); | |
1da177e4 LT |
3055 | |
3056 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3057 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3058 | ||
1da177e4 LT |
3059 | devinet_init(); |
3060 | ip_fib_init(); | |
3061 | ||
2fa7527b SH |
3062 | rt_secret_timer.function = rt_secret_rebuild; |
3063 | rt_secret_timer.data = 0; | |
3064 | init_timer_deferrable(&rt_secret_timer); | |
1da177e4 LT |
3065 | |
3066 | /* All the timers, started at system startup tend | |
3067 | to synchronize. Perturb it a bit. | |
3068 | */ | |
39c90ece ED |
3069 | schedule_delayed_work(&expires_work, |
3070 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
1da177e4 LT |
3071 | |
3072 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + | |
3073 | ip_rt_secret_interval; | |
3074 | add_timer(&rt_secret_timer); | |
3075 | ||
73b38711 | 3076 | if (ip_rt_proc_init()) |
107f1634 | 3077 | printk(KERN_ERR "Unable to create route proc files\n"); |
1da177e4 LT |
3078 | #ifdef CONFIG_XFRM |
3079 | xfrm_init(); | |
3080 | xfrm4_init(); | |
3081 | #endif | |
63f3444f TG |
3082 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3083 | ||
1da177e4 LT |
3084 | return rc; |
3085 | } | |
3086 | ||
3087 | EXPORT_SYMBOL(__ip_select_ident); | |
3088 | EXPORT_SYMBOL(ip_route_input); | |
3089 | EXPORT_SYMBOL(ip_route_output_key); |