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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 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
1da177e4 LT |
65 | #include <linux/module.h> |
66 | #include <asm/uaccess.h> | |
67 | #include <asm/system.h> | |
68 | #include <linux/bitops.h> | |
69 | #include <linux/types.h> | |
70 | #include <linux/kernel.h> | |
1da177e4 | 71 | #include <linux/mm.h> |
424c4b70 | 72 | #include <linux/bootmem.h> |
1da177e4 LT |
73 | #include <linux/string.h> |
74 | #include <linux/socket.h> | |
75 | #include <linux/sockios.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/in.h> | |
78 | #include <linux/inet.h> | |
79 | #include <linux/netdevice.h> | |
80 | #include <linux/proc_fs.h> | |
81 | #include <linux/init.h> | |
39c90ece | 82 | #include <linux/workqueue.h> |
1da177e4 | 83 | #include <linux/skbuff.h> |
1da177e4 LT |
84 | #include <linux/inetdevice.h> |
85 | #include <linux/igmp.h> | |
86 | #include <linux/pkt_sched.h> | |
87 | #include <linux/mroute.h> | |
88 | #include <linux/netfilter_ipv4.h> | |
89 | #include <linux/random.h> | |
90 | #include <linux/jhash.h> | |
91 | #include <linux/rcupdate.h> | |
92 | #include <linux/times.h> | |
352e512c | 93 | #include <net/dst.h> |
457c4cbc | 94 | #include <net/net_namespace.h> |
1da177e4 LT |
95 | #include <net/protocol.h> |
96 | #include <net/ip.h> | |
97 | #include <net/route.h> | |
98 | #include <net/inetpeer.h> | |
99 | #include <net/sock.h> | |
100 | #include <net/ip_fib.h> | |
101 | #include <net/arp.h> | |
102 | #include <net/tcp.h> | |
103 | #include <net/icmp.h> | |
104 | #include <net/xfrm.h> | |
8d71740c | 105 | #include <net/netevent.h> |
63f3444f | 106 | #include <net/rtnetlink.h> |
1da177e4 LT |
107 | #ifdef CONFIG_SYSCTL |
108 | #include <linux/sysctl.h> | |
109 | #endif | |
110 | ||
111 | #define RT_FL_TOS(oldflp) \ | |
112 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) | |
113 | ||
114 | #define IP_MAX_MTU 0xFFF0 | |
115 | ||
116 | #define RT_GC_TIMEOUT (300*HZ) | |
117 | ||
1da177e4 | 118 | static int ip_rt_max_size; |
817bc4db SH |
119 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
120 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; | |
121 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
122 | static int ip_rt_redirect_number __read_mostly = 9; | |
123 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
124 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
125 | static int ip_rt_error_cost __read_mostly = HZ; | |
126 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
127 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
128 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; | |
129 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
130 | static int ip_rt_min_advmss __read_mostly = 256; | |
131 | static int ip_rt_secret_interval __read_mostly = 10 * 60 * HZ; | |
1080d709 | 132 | static int rt_chain_length_max __read_mostly = 20; |
1da177e4 | 133 | |
beb659bd ED |
134 | static void rt_worker_func(struct work_struct *work); |
135 | static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); | |
1da177e4 LT |
136 | |
137 | /* | |
138 | * Interface to generic destination cache. | |
139 | */ | |
140 | ||
141 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
142 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
143 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
144 | struct net_device *dev, int how); | |
145 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
146 | static void ipv4_link_failure(struct sk_buff *skb); | |
147 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
569d3645 | 148 | static int rt_garbage_collect(struct dst_ops *ops); |
1080d709 | 149 | static void rt_emergency_hash_rebuild(struct net *net); |
1da177e4 LT |
150 | |
151 | ||
152 | static struct dst_ops ipv4_dst_ops = { | |
153 | .family = AF_INET, | |
154 | .protocol = __constant_htons(ETH_P_IP), | |
155 | .gc = rt_garbage_collect, | |
156 | .check = ipv4_dst_check, | |
157 | .destroy = ipv4_dst_destroy, | |
158 | .ifdown = ipv4_dst_ifdown, | |
159 | .negative_advice = ipv4_negative_advice, | |
160 | .link_failure = ipv4_link_failure, | |
161 | .update_pmtu = ip_rt_update_pmtu, | |
1ac06e03 | 162 | .local_out = __ip_local_out, |
1da177e4 | 163 | .entry_size = sizeof(struct rtable), |
e2422970 | 164 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
165 | }; |
166 | ||
167 | #define ECN_OR_COST(class) TC_PRIO_##class | |
168 | ||
4839c52b | 169 | const __u8 ip_tos2prio[16] = { |
1da177e4 LT |
170 | TC_PRIO_BESTEFFORT, |
171 | ECN_OR_COST(FILLER), | |
172 | TC_PRIO_BESTEFFORT, | |
173 | ECN_OR_COST(BESTEFFORT), | |
174 | TC_PRIO_BULK, | |
175 | ECN_OR_COST(BULK), | |
176 | TC_PRIO_BULK, | |
177 | ECN_OR_COST(BULK), | |
178 | TC_PRIO_INTERACTIVE, | |
179 | ECN_OR_COST(INTERACTIVE), | |
180 | TC_PRIO_INTERACTIVE, | |
181 | ECN_OR_COST(INTERACTIVE), | |
182 | TC_PRIO_INTERACTIVE_BULK, | |
183 | ECN_OR_COST(INTERACTIVE_BULK), | |
184 | TC_PRIO_INTERACTIVE_BULK, | |
185 | ECN_OR_COST(INTERACTIVE_BULK) | |
186 | }; | |
187 | ||
188 | ||
189 | /* | |
190 | * Route cache. | |
191 | */ | |
192 | ||
193 | /* The locking scheme is rather straight forward: | |
194 | * | |
195 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
196 | * 2) Only writers remove entries, and they hold the lock | |
197 | * as they look at rtable reference counts. | |
198 | * 3) Only readers acquire references to rtable entries, | |
199 | * they do so with atomic increments and with the | |
200 | * lock held. | |
201 | */ | |
202 | ||
203 | struct rt_hash_bucket { | |
204 | struct rtable *chain; | |
22c047cc | 205 | }; |
1080d709 | 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; | |
1da177e4 | 256 | |
2f970d83 | 257 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c | 258 | #define RT_CACHE_STAT_INC(field) \ |
bfe5d834 | 259 | (__raw_get_cpu_var(rt_cache_stat).field++) |
1da177e4 | 260 | |
b00180de DL |
261 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, |
262 | int genid) | |
1da177e4 | 263 | { |
1294fc4a SH |
264 | return jhash_3words((__force u32)(__be32)(daddr), |
265 | (__force u32)(__be32)(saddr), | |
b00180de | 266 | idx, genid) |
29e75252 | 267 | & rt_hash_mask; |
1da177e4 LT |
268 | } |
269 | ||
e84f84f2 DL |
270 | static inline int rt_genid(struct net *net) |
271 | { | |
272 | return atomic_read(&net->ipv4.rt_genid); | |
273 | } | |
274 | ||
1da177e4 LT |
275 | #ifdef CONFIG_PROC_FS |
276 | struct rt_cache_iter_state { | |
a75e936f | 277 | struct seq_net_private p; |
1da177e4 | 278 | int bucket; |
29e75252 | 279 | int genid; |
1da177e4 LT |
280 | }; |
281 | ||
1218854a | 282 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
1da177e4 | 283 | { |
1218854a | 284 | struct rt_cache_iter_state *st = seq->private; |
1da177e4 | 285 | struct rtable *r = NULL; |
1da177e4 LT |
286 | |
287 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
a6272665 ED |
288 | if (!rt_hash_table[st->bucket].chain) |
289 | continue; | |
1da177e4 | 290 | rcu_read_lock_bh(); |
29e75252 ED |
291 | r = rcu_dereference(rt_hash_table[st->bucket].chain); |
292 | while (r) { | |
1218854a | 293 | if (dev_net(r->u.dst.dev) == seq_file_net(seq) && |
a75e936f | 294 | r->rt_genid == st->genid) |
29e75252 ED |
295 | return r; |
296 | r = rcu_dereference(r->u.dst.rt_next); | |
297 | } | |
1da177e4 LT |
298 | rcu_read_unlock_bh(); |
299 | } | |
29e75252 | 300 | return r; |
1da177e4 LT |
301 | } |
302 | ||
1218854a | 303 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
642d6318 | 304 | struct rtable *r) |
1da177e4 | 305 | { |
1218854a | 306 | struct rt_cache_iter_state *st = seq->private; |
a6272665 | 307 | |
093c2ca4 | 308 | r = r->u.dst.rt_next; |
1da177e4 LT |
309 | while (!r) { |
310 | rcu_read_unlock_bh(); | |
a6272665 ED |
311 | do { |
312 | if (--st->bucket < 0) | |
313 | return NULL; | |
314 | } while (!rt_hash_table[st->bucket].chain); | |
1da177e4 LT |
315 | rcu_read_lock_bh(); |
316 | r = rt_hash_table[st->bucket].chain; | |
317 | } | |
0bcceadc | 318 | return rcu_dereference(r); |
1da177e4 LT |
319 | } |
320 | ||
1218854a | 321 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
642d6318 DL |
322 | struct rtable *r) |
323 | { | |
1218854a YH |
324 | struct rt_cache_iter_state *st = seq->private; |
325 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { | |
326 | if (dev_net(r->u.dst.dev) != seq_file_net(seq)) | |
a75e936f | 327 | continue; |
642d6318 DL |
328 | if (r->rt_genid == st->genid) |
329 | break; | |
330 | } | |
331 | return r; | |
332 | } | |
333 | ||
1218854a | 334 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 335 | { |
1218854a | 336 | struct rtable *r = rt_cache_get_first(seq); |
1da177e4 LT |
337 | |
338 | if (r) | |
1218854a | 339 | while (pos && (r = rt_cache_get_next(seq, r))) |
1da177e4 LT |
340 | --pos; |
341 | return pos ? NULL : r; | |
342 | } | |
343 | ||
344 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
345 | { | |
29e75252 | 346 | struct rt_cache_iter_state *st = seq->private; |
29e75252 | 347 | if (*pos) |
1218854a | 348 | return rt_cache_get_idx(seq, *pos - 1); |
e84f84f2 | 349 | st->genid = rt_genid(seq_file_net(seq)); |
29e75252 | 350 | return SEQ_START_TOKEN; |
1da177e4 LT |
351 | } |
352 | ||
353 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
354 | { | |
29e75252 | 355 | struct rtable *r; |
1da177e4 LT |
356 | |
357 | if (v == SEQ_START_TOKEN) | |
1218854a | 358 | r = rt_cache_get_first(seq); |
1da177e4 | 359 | else |
1218854a | 360 | r = rt_cache_get_next(seq, v); |
1da177e4 LT |
361 | ++*pos; |
362 | return r; | |
363 | } | |
364 | ||
365 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
366 | { | |
367 | if (v && v != SEQ_START_TOKEN) | |
368 | rcu_read_unlock_bh(); | |
369 | } | |
370 | ||
371 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
372 | { | |
373 | if (v == SEQ_START_TOKEN) | |
374 | seq_printf(seq, "%-127s\n", | |
375 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
376 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
377 | "HHUptod\tSpecDst"); | |
378 | else { | |
379 | struct rtable *r = v; | |
5e659e4c | 380 | int len; |
1da177e4 | 381 | |
5e659e4c PE |
382 | seq_printf(seq, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" |
383 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", | |
1da177e4 LT |
384 | r->u.dst.dev ? r->u.dst.dev->name : "*", |
385 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
386 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
387 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
388 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
389 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
390 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
391 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
392 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
393 | r->fl.fl4_tos, | |
394 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
395 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
396 | dev_queue_xmit) : 0, | |
5e659e4c PE |
397 | r->rt_spec_dst, &len); |
398 | ||
399 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
e905a9ed YH |
400 | } |
401 | return 0; | |
1da177e4 LT |
402 | } |
403 | ||
f690808e | 404 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
405 | .start = rt_cache_seq_start, |
406 | .next = rt_cache_seq_next, | |
407 | .stop = rt_cache_seq_stop, | |
408 | .show = rt_cache_seq_show, | |
409 | }; | |
410 | ||
411 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
412 | { | |
a75e936f | 413 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 414 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
415 | } |
416 | ||
9a32144e | 417 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
418 | .owner = THIS_MODULE, |
419 | .open = rt_cache_seq_open, | |
420 | .read = seq_read, | |
421 | .llseek = seq_lseek, | |
a75e936f | 422 | .release = seq_release_net, |
1da177e4 LT |
423 | }; |
424 | ||
425 | ||
426 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
427 | { | |
428 | int cpu; | |
429 | ||
430 | if (*pos == 0) | |
431 | return SEQ_START_TOKEN; | |
432 | ||
433 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
434 | if (!cpu_possible(cpu)) | |
435 | continue; | |
436 | *pos = cpu+1; | |
2f970d83 | 437 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
438 | } |
439 | return NULL; | |
440 | } | |
441 | ||
442 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
443 | { | |
444 | int cpu; | |
445 | ||
446 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
447 | if (!cpu_possible(cpu)) | |
448 | continue; | |
449 | *pos = cpu+1; | |
2f970d83 | 450 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
451 | } |
452 | return NULL; | |
e905a9ed | 453 | |
1da177e4 LT |
454 | } |
455 | ||
456 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
457 | { | |
458 | ||
459 | } | |
460 | ||
461 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
462 | { | |
463 | struct rt_cache_stat *st = v; | |
464 | ||
465 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 466 | 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 |
467 | return 0; |
468 | } | |
e905a9ed | 469 | |
1da177e4 LT |
470 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
471 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
472 | atomic_read(&ipv4_dst_ops.entries), | |
473 | st->in_hit, | |
474 | st->in_slow_tot, | |
475 | st->in_slow_mc, | |
476 | st->in_no_route, | |
477 | st->in_brd, | |
478 | st->in_martian_dst, | |
479 | st->in_martian_src, | |
480 | ||
481 | st->out_hit, | |
482 | st->out_slow_tot, | |
e905a9ed | 483 | st->out_slow_mc, |
1da177e4 LT |
484 | |
485 | st->gc_total, | |
486 | st->gc_ignored, | |
487 | st->gc_goal_miss, | |
488 | st->gc_dst_overflow, | |
489 | st->in_hlist_search, | |
490 | st->out_hlist_search | |
491 | ); | |
492 | return 0; | |
493 | } | |
494 | ||
f690808e | 495 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
496 | .start = rt_cpu_seq_start, |
497 | .next = rt_cpu_seq_next, | |
498 | .stop = rt_cpu_seq_stop, | |
499 | .show = rt_cpu_seq_show, | |
500 | }; | |
501 | ||
502 | ||
503 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
504 | { | |
505 | return seq_open(file, &rt_cpu_seq_ops); | |
506 | } | |
507 | ||
9a32144e | 508 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
509 | .owner = THIS_MODULE, |
510 | .open = rt_cpu_seq_open, | |
511 | .read = seq_read, | |
512 | .llseek = seq_lseek, | |
513 | .release = seq_release, | |
514 | }; | |
515 | ||
78c686e9 PE |
516 | #ifdef CONFIG_NET_CLS_ROUTE |
517 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
518 | int length, int *eof, void *data) | |
519 | { | |
520 | unsigned int i; | |
521 | ||
522 | if ((offset & 3) || (length & 3)) | |
523 | return -EIO; | |
524 | ||
525 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
526 | *eof = 1; | |
527 | return 0; | |
528 | } | |
529 | ||
530 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
531 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
532 | *eof = 1; | |
533 | } | |
534 | ||
535 | offset /= sizeof(u32); | |
536 | ||
537 | if (length > 0) { | |
538 | u32 *dst = (u32 *) buffer; | |
539 | ||
540 | *start = buffer; | |
541 | memset(dst, 0, length); | |
542 | ||
543 | for_each_possible_cpu(i) { | |
544 | unsigned int j; | |
545 | u32 *src; | |
546 | ||
547 | src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset; | |
548 | for (j = 0; j < length/4; j++) | |
549 | dst[j] += src[j]; | |
550 | } | |
551 | } | |
552 | return length; | |
553 | } | |
554 | #endif | |
107f1634 | 555 | |
73b38711 | 556 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
557 | { |
558 | struct proc_dir_entry *pde; | |
559 | ||
560 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
561 | &rt_cache_seq_fops); | |
562 | if (!pde) | |
563 | goto err1; | |
564 | ||
77020720 WC |
565 | pde = proc_create("rt_cache", S_IRUGO, |
566 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
567 | if (!pde) |
568 | goto err2; | |
569 | ||
107f1634 PE |
570 | #ifdef CONFIG_NET_CLS_ROUTE |
571 | pde = create_proc_read_entry("rt_acct", 0, net->proc_net, | |
572 | ip_rt_acct_read, NULL); | |
573 | if (!pde) | |
574 | goto err3; | |
575 | #endif | |
576 | return 0; | |
577 | ||
578 | #ifdef CONFIG_NET_CLS_ROUTE | |
579 | err3: | |
580 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
581 | #endif | |
582 | err2: | |
583 | remove_proc_entry("rt_cache", net->proc_net); | |
584 | err1: | |
585 | return -ENOMEM; | |
586 | } | |
73b38711 DL |
587 | |
588 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
589 | { | |
590 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
591 | remove_proc_entry("rt_cache", net->proc_net); | |
592 | remove_proc_entry("rt_acct", net->proc_net); | |
593 | } | |
594 | ||
595 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
596 | .init = ip_rt_do_proc_init, | |
597 | .exit = ip_rt_do_proc_exit, | |
598 | }; | |
599 | ||
600 | static int __init ip_rt_proc_init(void) | |
601 | { | |
602 | return register_pernet_subsys(&ip_rt_proc_ops); | |
603 | } | |
604 | ||
107f1634 | 605 | #else |
73b38711 | 606 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
607 | { |
608 | return 0; | |
609 | } | |
1da177e4 | 610 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 611 | |
5969f71d | 612 | static inline void rt_free(struct rtable *rt) |
1da177e4 | 613 | { |
1da177e4 LT |
614 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
615 | } | |
616 | ||
5969f71d | 617 | static inline void rt_drop(struct rtable *rt) |
1da177e4 | 618 | { |
1da177e4 LT |
619 | ip_rt_put(rt); |
620 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
621 | } | |
622 | ||
5969f71d | 623 | static inline int rt_fast_clean(struct rtable *rth) |
1da177e4 LT |
624 | { |
625 | /* Kill broadcast/multicast entries very aggresively, if they | |
626 | collide in hash table with more useful entries */ | |
627 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 628 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
629 | } |
630 | ||
5969f71d | 631 | static inline int rt_valuable(struct rtable *rth) |
1da177e4 LT |
632 | { |
633 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
634 | rth->u.dst.expires; | |
635 | } | |
636 | ||
637 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
638 | { | |
639 | unsigned long age; | |
640 | int ret = 0; | |
641 | ||
642 | if (atomic_read(&rth->u.dst.__refcnt)) | |
643 | goto out; | |
644 | ||
645 | ret = 1; | |
646 | if (rth->u.dst.expires && | |
647 | time_after_eq(jiffies, rth->u.dst.expires)) | |
648 | goto out; | |
649 | ||
650 | age = jiffies - rth->u.dst.lastuse; | |
651 | ret = 0; | |
652 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
653 | (age <= tmo2 && rt_valuable(rth))) | |
654 | goto out; | |
655 | ret = 1; | |
656 | out: return ret; | |
657 | } | |
658 | ||
659 | /* Bits of score are: | |
660 | * 31: very valuable | |
661 | * 30: not quite useless | |
662 | * 29..0: usage counter | |
663 | */ | |
664 | static inline u32 rt_score(struct rtable *rt) | |
665 | { | |
666 | u32 score = jiffies - rt->u.dst.lastuse; | |
667 | ||
668 | score = ~score & ~(3<<30); | |
669 | ||
670 | if (rt_valuable(rt)) | |
671 | score |= (1<<31); | |
672 | ||
673 | if (!rt->fl.iif || | |
674 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
675 | score |= (1<<30); | |
676 | ||
677 | return score; | |
678 | } | |
679 | ||
1080d709 NH |
680 | static inline bool rt_caching(const struct net *net) |
681 | { | |
682 | return net->ipv4.current_rt_cache_rebuild_count <= | |
683 | net->ipv4.sysctl_rt_cache_rebuild_count; | |
684 | } | |
685 | ||
686 | static inline bool compare_hash_inputs(const struct flowi *fl1, | |
687 | const struct flowi *fl2) | |
688 | { | |
689 | return (__force u32)(((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | | |
690 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr) | | |
691 | (fl1->iif ^ fl2->iif)) == 0); | |
692 | } | |
693 | ||
1da177e4 LT |
694 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
695 | { | |
714e85be AV |
696 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
697 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 698 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
699 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
700 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
701 | (fl1->oif ^ fl2->oif) | | |
702 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
703 | } |
704 | ||
b5921910 DL |
705 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
706 | { | |
c346dca1 | 707 | return dev_net(rt1->u.dst.dev) == dev_net(rt2->u.dst.dev); |
b5921910 DL |
708 | } |
709 | ||
e84f84f2 DL |
710 | static inline int rt_is_expired(struct rtable *rth) |
711 | { | |
712 | return rth->rt_genid != rt_genid(dev_net(rth->u.dst.dev)); | |
713 | } | |
714 | ||
beb659bd ED |
715 | /* |
716 | * Perform a full scan of hash table and free all entries. | |
717 | * Can be called by a softirq or a process. | |
718 | * In the later case, we want to be reschedule if necessary | |
719 | */ | |
720 | static void rt_do_flush(int process_context) | |
721 | { | |
722 | unsigned int i; | |
723 | struct rtable *rth, *next; | |
32cb5b4e | 724 | struct rtable * tail; |
beb659bd ED |
725 | |
726 | for (i = 0; i <= rt_hash_mask; i++) { | |
727 | if (process_context && need_resched()) | |
728 | cond_resched(); | |
729 | rth = rt_hash_table[i].chain; | |
730 | if (!rth) | |
731 | continue; | |
732 | ||
733 | spin_lock_bh(rt_hash_lock_addr(i)); | |
32cb5b4e DL |
734 | #ifdef CONFIG_NET_NS |
735 | { | |
736 | struct rtable ** prev, * p; | |
737 | ||
738 | rth = rt_hash_table[i].chain; | |
739 | ||
740 | /* defer releasing the head of the list after spin_unlock */ | |
741 | for (tail = rth; tail; tail = tail->u.dst.rt_next) | |
742 | if (!rt_is_expired(tail)) | |
743 | break; | |
744 | if (rth != tail) | |
745 | rt_hash_table[i].chain = tail; | |
746 | ||
747 | /* call rt_free on entries after the tail requiring flush */ | |
748 | prev = &rt_hash_table[i].chain; | |
749 | for (p = *prev; p; p = next) { | |
750 | next = p->u.dst.rt_next; | |
751 | if (!rt_is_expired(p)) { | |
752 | prev = &p->u.dst.rt_next; | |
753 | } else { | |
754 | *prev = next; | |
755 | rt_free(p); | |
756 | } | |
757 | } | |
758 | } | |
759 | #else | |
beb659bd ED |
760 | rth = rt_hash_table[i].chain; |
761 | rt_hash_table[i].chain = NULL; | |
32cb5b4e DL |
762 | tail = NULL; |
763 | #endif | |
beb659bd ED |
764 | spin_unlock_bh(rt_hash_lock_addr(i)); |
765 | ||
32cb5b4e | 766 | for (; rth != tail; rth = next) { |
beb659bd ED |
767 | next = rth->u.dst.rt_next; |
768 | rt_free(rth); | |
769 | } | |
770 | } | |
771 | } | |
772 | ||
1080d709 NH |
773 | /* |
774 | * While freeing expired entries, we compute average chain length | |
775 | * and standard deviation, using fixed-point arithmetic. | |
776 | * This to have an estimation of rt_chain_length_max | |
777 | * rt_chain_length_max = max(elasticity, AVG + 4*SD) | |
778 | * We use 3 bits for frational part, and 29 (or 61) for magnitude. | |
779 | */ | |
780 | ||
781 | #define FRACT_BITS 3 | |
782 | #define ONE (1UL << FRACT_BITS) | |
783 | ||
beb659bd | 784 | static void rt_check_expire(void) |
1da177e4 | 785 | { |
bb1d23b0 ED |
786 | static unsigned int rover; |
787 | unsigned int i = rover, goal; | |
1da177e4 | 788 | struct rtable *rth, **rthp; |
1080d709 NH |
789 | unsigned long length = 0, samples = 0; |
790 | unsigned long sum = 0, sum2 = 0; | |
bb1d23b0 ED |
791 | u64 mult; |
792 | ||
793 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
794 | if (ip_rt_gc_timeout > 1) | |
795 | do_div(mult, ip_rt_gc_timeout); | |
796 | goal = (unsigned int)mult; | |
39c90ece ED |
797 | if (goal > rt_hash_mask) |
798 | goal = rt_hash_mask + 1; | |
1080d709 | 799 | length = 0; |
bb1d23b0 | 800 | for (; goal > 0; goal--) { |
1da177e4 LT |
801 | unsigned long tmo = ip_rt_gc_timeout; |
802 | ||
803 | i = (i + 1) & rt_hash_mask; | |
804 | rthp = &rt_hash_table[i].chain; | |
805 | ||
d90bf5a9 ED |
806 | if (need_resched()) |
807 | cond_resched(); | |
808 | ||
1080d709 NH |
809 | samples++; |
810 | ||
cfcabdcc | 811 | if (*rthp == NULL) |
bb1d23b0 | 812 | continue; |
39c90ece | 813 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 | 814 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 815 | if (rt_is_expired(rth)) { |
29e75252 ED |
816 | *rthp = rth->u.dst.rt_next; |
817 | rt_free(rth); | |
818 | continue; | |
819 | } | |
1da177e4 LT |
820 | if (rth->u.dst.expires) { |
821 | /* Entry is expired even if it is in use */ | |
39c90ece | 822 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
1da177e4 | 823 | tmo >>= 1; |
093c2ca4 | 824 | rthp = &rth->u.dst.rt_next; |
1080d709 NH |
825 | /* |
826 | * Only bump our length if the hash | |
827 | * inputs on entries n and n+1 are not | |
828 | * the same, we only count entries on | |
829 | * a chain with equal hash inputs once | |
830 | * so that entries for different QOS | |
831 | * levels, and other non-hash input | |
832 | * attributes don't unfairly skew | |
833 | * the length computation | |
834 | */ | |
835 | if ((*rthp == NULL) || | |
836 | !compare_hash_inputs(&(*rthp)->fl, | |
837 | &rth->fl)) | |
838 | length += ONE; | |
1da177e4 LT |
839 | continue; |
840 | } | |
841 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
842 | tmo >>= 1; | |
093c2ca4 | 843 | rthp = &rth->u.dst.rt_next; |
1080d709 NH |
844 | if ((*rthp == NULL) || |
845 | !compare_hash_inputs(&(*rthp)->fl, | |
846 | &rth->fl)) | |
847 | length += ONE; | |
1da177e4 LT |
848 | continue; |
849 | } | |
850 | ||
851 | /* Cleanup aged off entries. */ | |
093c2ca4 | 852 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 853 | rt_free(rth); |
1da177e4 | 854 | } |
39c90ece | 855 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1080d709 NH |
856 | sum += length; |
857 | sum2 += length*length; | |
858 | } | |
859 | if (samples) { | |
860 | unsigned long avg = sum / samples; | |
861 | unsigned long sd = int_sqrt(sum2 / samples - avg*avg); | |
862 | rt_chain_length_max = max_t(unsigned long, | |
863 | ip_rt_gc_elasticity, | |
864 | (avg + 4*sd) >> FRACT_BITS); | |
1da177e4 LT |
865 | } |
866 | rover = i; | |
beb659bd ED |
867 | } |
868 | ||
869 | /* | |
870 | * rt_worker_func() is run in process context. | |
29e75252 | 871 | * we call rt_check_expire() to scan part of the hash table |
beb659bd ED |
872 | */ |
873 | static void rt_worker_func(struct work_struct *work) | |
874 | { | |
29e75252 | 875 | rt_check_expire(); |
39c90ece | 876 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
1da177e4 LT |
877 | } |
878 | ||
29e75252 ED |
879 | /* |
880 | * Pertubation of rt_genid by a small quantity [1..256] | |
881 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() | |
882 | * many times (2^24) without giving recent rt_genid. | |
883 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 884 | */ |
86c657f6 | 885 | static void rt_cache_invalidate(struct net *net) |
1da177e4 | 886 | { |
29e75252 | 887 | unsigned char shuffle; |
1da177e4 | 888 | |
29e75252 | 889 | get_random_bytes(&shuffle, sizeof(shuffle)); |
e84f84f2 | 890 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
1da177e4 LT |
891 | } |
892 | ||
29e75252 ED |
893 | /* |
894 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
895 | * delay >= 0 : invalidate & flush cache (can be long) | |
896 | */ | |
76e6ebfb | 897 | void rt_cache_flush(struct net *net, int delay) |
1da177e4 | 898 | { |
86c657f6 | 899 | rt_cache_invalidate(net); |
29e75252 ED |
900 | if (delay >= 0) |
901 | rt_do_flush(!in_softirq()); | |
1da177e4 LT |
902 | } |
903 | ||
beb659bd | 904 | /* |
29e75252 | 905 | * We change rt_genid and let gc do the cleanup |
beb659bd | 906 | */ |
9f5e97e5 | 907 | static void rt_secret_rebuild(unsigned long __net) |
1da177e4 | 908 | { |
9f5e97e5 | 909 | struct net *net = (struct net *)__net; |
86c657f6 | 910 | rt_cache_invalidate(net); |
9f5e97e5 | 911 | mod_timer(&net->ipv4.rt_secret_timer, jiffies + ip_rt_secret_interval); |
1da177e4 LT |
912 | } |
913 | ||
1080d709 NH |
914 | static void rt_secret_rebuild_oneshot(struct net *net) |
915 | { | |
916 | del_timer_sync(&net->ipv4.rt_secret_timer); | |
917 | rt_cache_invalidate(net); | |
918 | if (ip_rt_secret_interval) { | |
919 | net->ipv4.rt_secret_timer.expires += ip_rt_secret_interval; | |
920 | add_timer(&net->ipv4.rt_secret_timer); | |
921 | } | |
922 | } | |
923 | ||
924 | static void rt_emergency_hash_rebuild(struct net *net) | |
925 | { | |
926 | if (net_ratelimit()) { | |
927 | printk(KERN_WARNING "Route hash chain too long!\n"); | |
928 | printk(KERN_WARNING "Adjust your secret_interval!\n"); | |
929 | } | |
930 | ||
931 | rt_secret_rebuild_oneshot(net); | |
932 | } | |
933 | ||
1da177e4 LT |
934 | /* |
935 | Short description of GC goals. | |
936 | ||
937 | We want to build algorithm, which will keep routing cache | |
938 | at some equilibrium point, when number of aged off entries | |
939 | is kept approximately equal to newly generated ones. | |
940 | ||
941 | Current expiration strength is variable "expire". | |
942 | We try to adjust it dynamically, so that if networking | |
943 | is idle expires is large enough to keep enough of warm entries, | |
944 | and when load increases it reduces to limit cache size. | |
945 | */ | |
946 | ||
569d3645 | 947 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
948 | { |
949 | static unsigned long expire = RT_GC_TIMEOUT; | |
950 | static unsigned long last_gc; | |
951 | static int rover; | |
952 | static int equilibrium; | |
953 | struct rtable *rth, **rthp; | |
954 | unsigned long now = jiffies; | |
955 | int goal; | |
956 | ||
957 | /* | |
958 | * Garbage collection is pretty expensive, | |
959 | * do not make it too frequently. | |
960 | */ | |
961 | ||
962 | RT_CACHE_STAT_INC(gc_total); | |
963 | ||
964 | if (now - last_gc < ip_rt_gc_min_interval && | |
965 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
966 | RT_CACHE_STAT_INC(gc_ignored); | |
967 | goto out; | |
968 | } | |
969 | ||
970 | /* Calculate number of entries, which we want to expire now. */ | |
971 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
972 | (ip_rt_gc_elasticity << rt_hash_log); | |
973 | if (goal <= 0) { | |
974 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
975 | equilibrium = ipv4_dst_ops.gc_thresh; | |
976 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
977 | if (goal > 0) { | |
b790cedd | 978 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
979 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
980 | } | |
981 | } else { | |
982 | /* We are in dangerous area. Try to reduce cache really | |
983 | * aggressively. | |
984 | */ | |
b790cedd | 985 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
986 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
987 | } | |
988 | ||
989 | if (now - last_gc >= ip_rt_gc_min_interval) | |
990 | last_gc = now; | |
991 | ||
992 | if (goal <= 0) { | |
993 | equilibrium += goal; | |
994 | goto work_done; | |
995 | } | |
996 | ||
997 | do { | |
998 | int i, k; | |
999 | ||
1000 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
1001 | unsigned long tmo = expire; | |
1002 | ||
1003 | k = (k + 1) & rt_hash_mask; | |
1004 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 1005 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 | 1006 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 1007 | if (!rt_is_expired(rth) && |
29e75252 | 1008 | !rt_may_expire(rth, tmo, expire)) { |
1da177e4 | 1009 | tmo >>= 1; |
093c2ca4 | 1010 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1011 | continue; |
1012 | } | |
093c2ca4 | 1013 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
1014 | rt_free(rth); |
1015 | goal--; | |
1da177e4 | 1016 | } |
22c047cc | 1017 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
1018 | if (goal <= 0) |
1019 | break; | |
1020 | } | |
1021 | rover = k; | |
1022 | ||
1023 | if (goal <= 0) | |
1024 | goto work_done; | |
1025 | ||
1026 | /* Goal is not achieved. We stop process if: | |
1027 | ||
1028 | - if expire reduced to zero. Otherwise, expire is halfed. | |
1029 | - if table is not full. | |
1030 | - if we are called from interrupt. | |
1031 | - jiffies check is just fallback/debug loop breaker. | |
1032 | We will not spin here for long time in any case. | |
1033 | */ | |
1034 | ||
1035 | RT_CACHE_STAT_INC(gc_goal_miss); | |
1036 | ||
1037 | if (expire == 0) | |
1038 | break; | |
1039 | ||
1040 | expire >>= 1; | |
1041 | #if RT_CACHE_DEBUG >= 2 | |
1042 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
1043 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
1044 | #endif | |
1045 | ||
1046 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
1047 | goto out; | |
1048 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
1049 | ||
1050 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
1051 | goto out; | |
1052 | if (net_ratelimit()) | |
1053 | printk(KERN_WARNING "dst cache overflow\n"); | |
1054 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
1055 | return 1; | |
1056 | ||
1057 | work_done: | |
1058 | expire += ip_rt_gc_min_interval; | |
1059 | if (expire > ip_rt_gc_timeout || | |
1060 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
1061 | expire = ip_rt_gc_timeout; | |
1062 | #if RT_CACHE_DEBUG >= 2 | |
1063 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
1064 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
1065 | #endif | |
1066 | out: return 0; | |
1067 | } | |
1068 | ||
1069 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
1070 | { | |
1071 | struct rtable *rth, **rthp; | |
1080d709 | 1072 | struct rtable *rthi; |
1da177e4 LT |
1073 | unsigned long now; |
1074 | struct rtable *cand, **candp; | |
1075 | u32 min_score; | |
1076 | int chain_length; | |
1077 | int attempts = !in_softirq(); | |
1078 | ||
1079 | restart: | |
1080 | chain_length = 0; | |
1081 | min_score = ~(u32)0; | |
1082 | cand = NULL; | |
1083 | candp = NULL; | |
1084 | now = jiffies; | |
1085 | ||
1080d709 NH |
1086 | if (!rt_caching(dev_net(rt->u.dst.dev))) { |
1087 | rt_drop(rt); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1da177e4 | 1091 | rthp = &rt_hash_table[hash].chain; |
1080d709 | 1092 | rthi = NULL; |
1da177e4 | 1093 | |
22c047cc | 1094 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1095 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 1096 | if (rt_is_expired(rth)) { |
29e75252 ED |
1097 | *rthp = rth->u.dst.rt_next; |
1098 | rt_free(rth); | |
1099 | continue; | |
1100 | } | |
b5921910 | 1101 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
1da177e4 | 1102 | /* Put it first */ |
093c2ca4 | 1103 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
1104 | /* |
1105 | * Since lookup is lockfree, the deletion | |
1106 | * must be visible to another weakly ordered CPU before | |
1107 | * the insertion at the start of the hash chain. | |
1108 | */ | |
093c2ca4 | 1109 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
1110 | rt_hash_table[hash].chain); |
1111 | /* | |
1112 | * Since lookup is lockfree, the update writes | |
1113 | * must be ordered for consistency on SMP. | |
1114 | */ | |
1115 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
1116 | ||
03f49f34 | 1117 | dst_use(&rth->u.dst, now); |
22c047cc | 1118 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1119 | |
1120 | rt_drop(rt); | |
1121 | *rp = rth; | |
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
1126 | u32 score = rt_score(rth); | |
1127 | ||
1128 | if (score <= min_score) { | |
1129 | cand = rth; | |
1130 | candp = rthp; | |
1131 | min_score = score; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | chain_length++; | |
1136 | ||
093c2ca4 | 1137 | rthp = &rth->u.dst.rt_next; |
1080d709 NH |
1138 | |
1139 | /* | |
1140 | * check to see if the next entry in the chain | |
1141 | * contains the same hash input values as rt. If it does | |
1142 | * This is where we will insert into the list, instead of | |
1143 | * at the head. This groups entries that differ by aspects not | |
1144 | * relvant to the hash function together, which we use to adjust | |
1145 | * our chain length | |
1146 | */ | |
1147 | if (*rthp && compare_hash_inputs(&(*rthp)->fl, &rt->fl)) | |
1148 | rthi = rth; | |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | if (cand) { | |
1152 | /* ip_rt_gc_elasticity used to be average length of chain | |
1153 | * length, when exceeded gc becomes really aggressive. | |
1154 | * | |
1155 | * The second limit is less certain. At the moment it allows | |
1156 | * only 2 entries per bucket. We will see. | |
1157 | */ | |
1158 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 1159 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
1160 | rt_free(cand); |
1161 | } | |
1080d709 NH |
1162 | } else { |
1163 | if (chain_length > rt_chain_length_max) { | |
1164 | struct net *net = dev_net(rt->u.dst.dev); | |
1165 | int num = ++net->ipv4.current_rt_cache_rebuild_count; | |
1166 | if (!rt_caching(dev_net(rt->u.dst.dev))) { | |
1167 | printk(KERN_WARNING "%s: %d rebuilds is over limit, route caching disabled\n", | |
1168 | rt->u.dst.dev->name, num); | |
1169 | } | |
1170 | rt_emergency_hash_rebuild(dev_net(rt->u.dst.dev)); | |
1171 | } | |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | /* Try to bind route to arp only if it is output | |
1175 | route or unicast forwarding path. | |
1176 | */ | |
1177 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
1178 | int err = arp_bind_neighbour(&rt->u.dst); | |
1179 | if (err) { | |
22c047cc | 1180 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1181 | |
1182 | if (err != -ENOBUFS) { | |
1183 | rt_drop(rt); | |
1184 | return err; | |
1185 | } | |
1186 | ||
1187 | /* Neighbour tables are full and nothing | |
1188 | can be released. Try to shrink route cache, | |
1189 | it is most likely it holds some neighbour records. | |
1190 | */ | |
1191 | if (attempts-- > 0) { | |
1192 | int saved_elasticity = ip_rt_gc_elasticity; | |
1193 | int saved_int = ip_rt_gc_min_interval; | |
1194 | ip_rt_gc_elasticity = 1; | |
1195 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1196 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1197 | ip_rt_gc_min_interval = saved_int; |
1198 | ip_rt_gc_elasticity = saved_elasticity; | |
1199 | goto restart; | |
1200 | } | |
1201 | ||
1202 | if (net_ratelimit()) | |
1203 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1204 | rt_drop(rt); | |
1205 | return -ENOBUFS; | |
1206 | } | |
1207 | } | |
1208 | ||
1080d709 NH |
1209 | if (rthi) |
1210 | rt->u.dst.rt_next = rthi->u.dst.rt_next; | |
1211 | else | |
1212 | rt->u.dst.rt_next = rt_hash_table[hash].chain; | |
1213 | ||
1da177e4 | 1214 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 1215 | if (rt->u.dst.rt_next) { |
1da177e4 | 1216 | struct rtable *trt; |
a7d632b6 | 1217 | printk(KERN_DEBUG "rt_cache @%02x: " NIPQUAD_FMT, hash, |
1da177e4 | 1218 | NIPQUAD(rt->rt_dst)); |
093c2ca4 | 1219 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
a7d632b6 | 1220 | printk(" . " NIPQUAD_FMT, NIPQUAD(trt->rt_dst)); |
1da177e4 LT |
1221 | printk("\n"); |
1222 | } | |
1223 | #endif | |
00269b54 ED |
1224 | /* |
1225 | * Since lookup is lockfree, we must make sure | |
1226 | * previous writes to rt are comitted to memory | |
1227 | * before making rt visible to other CPUS. | |
1228 | */ | |
1080d709 NH |
1229 | if (rthi) |
1230 | rcu_assign_pointer(rthi->u.dst.rt_next, rt); | |
1231 | else | |
1232 | rcu_assign_pointer(rt_hash_table[hash].chain, rt); | |
1233 | ||
22c047cc | 1234 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1235 | *rp = rt; |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | void rt_bind_peer(struct rtable *rt, int create) | |
1240 | { | |
1241 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1242 | struct inet_peer *peer; | |
1243 | ||
1244 | peer = inet_getpeer(rt->rt_dst, create); | |
1245 | ||
1246 | spin_lock_bh(&rt_peer_lock); | |
1247 | if (rt->peer == NULL) { | |
1248 | rt->peer = peer; | |
1249 | peer = NULL; | |
1250 | } | |
1251 | spin_unlock_bh(&rt_peer_lock); | |
1252 | if (peer) | |
1253 | inet_putpeer(peer); | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1258 | * we still can generate some output. | |
1259 | * Random ID selection looks a bit dangerous because we have no chances to | |
1260 | * select ID being unique in a reasonable period of time. | |
1261 | * But broken packet identifier may be better than no packet at all. | |
1262 | */ | |
1263 | static void ip_select_fb_ident(struct iphdr *iph) | |
1264 | { | |
1265 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1266 | static u32 ip_fallback_id; | |
1267 | u32 salt; | |
1268 | ||
1269 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1270 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1271 | iph->id = htons(salt & 0xFFFF); |
1272 | ip_fallback_id = salt; | |
1273 | spin_unlock_bh(&ip_fb_id_lock); | |
1274 | } | |
1275 | ||
1276 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1277 | { | |
1278 | struct rtable *rt = (struct rtable *) dst; | |
1279 | ||
1280 | if (rt) { | |
1281 | if (rt->peer == NULL) | |
1282 | rt_bind_peer(rt, 1); | |
1283 | ||
1284 | /* If peer is attached to destination, it is never detached, | |
1285 | so that we need not to grab a lock to dereference it. | |
1286 | */ | |
1287 | if (rt->peer) { | |
1288 | iph->id = htons(inet_getid(rt->peer, more)); | |
1289 | return; | |
1290 | } | |
1291 | } else | |
e905a9ed | 1292 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1293 | __builtin_return_address(0)); |
1da177e4 LT |
1294 | |
1295 | ip_select_fb_ident(iph); | |
1296 | } | |
1297 | ||
1298 | static void rt_del(unsigned hash, struct rtable *rt) | |
1299 | { | |
29e75252 | 1300 | struct rtable **rthp, *aux; |
1da177e4 | 1301 | |
29e75252 | 1302 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1303 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1304 | ip_rt_put(rt); |
29e75252 | 1305 | while ((aux = *rthp) != NULL) { |
e84f84f2 | 1306 | if (aux == rt || rt_is_expired(aux)) { |
29e75252 ED |
1307 | *rthp = aux->u.dst.rt_next; |
1308 | rt_free(aux); | |
1309 | continue; | |
1da177e4 | 1310 | } |
29e75252 ED |
1311 | rthp = &aux->u.dst.rt_next; |
1312 | } | |
22c047cc | 1313 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1314 | } |
1315 | ||
f7655229 AV |
1316 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1317 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1318 | { |
1319 | int i, k; | |
1320 | struct in_device *in_dev = in_dev_get(dev); | |
1321 | struct rtable *rth, **rthp; | |
f7655229 | 1322 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1323 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1324 | struct netevent_redirect netevent; |
317805b8 | 1325 | struct net *net; |
1da177e4 | 1326 | |
1da177e4 LT |
1327 | if (!in_dev) |
1328 | return; | |
1329 | ||
c346dca1 | 1330 | net = dev_net(dev); |
1da177e4 | 1331 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
1e637c74 | 1332 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
f97c1e0c | 1333 | || ipv4_is_zeronet(new_gw)) |
1da177e4 LT |
1334 | goto reject_redirect; |
1335 | ||
1080d709 NH |
1336 | if (!rt_caching(net)) |
1337 | goto reject_redirect; | |
1338 | ||
1da177e4 LT |
1339 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
1340 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1341 | goto reject_redirect; | |
1342 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1343 | goto reject_redirect; | |
1344 | } else { | |
317805b8 | 1345 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1346 | goto reject_redirect; |
1347 | } | |
1348 | ||
1349 | for (i = 0; i < 2; i++) { | |
1350 | for (k = 0; k < 2; k++) { | |
b00180de | 1351 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k], |
e84f84f2 | 1352 | rt_genid(net)); |
1da177e4 LT |
1353 | |
1354 | rthp=&rt_hash_table[hash].chain; | |
1355 | ||
1356 | rcu_read_lock(); | |
1357 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1358 | struct rtable *rt; | |
1359 | ||
1360 | if (rth->fl.fl4_dst != daddr || | |
1361 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 | 1362 | rth->fl.oif != ikeys[k] || |
29e75252 | 1363 | rth->fl.iif != 0 || |
e84f84f2 | 1364 | rt_is_expired(rth) || |
878628fb | 1365 | !net_eq(dev_net(rth->u.dst.dev), net)) { |
093c2ca4 | 1366 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1367 | continue; |
1368 | } | |
1369 | ||
1370 | if (rth->rt_dst != daddr || | |
1371 | rth->rt_src != saddr || | |
1372 | rth->u.dst.error || | |
1373 | rth->rt_gateway != old_gw || | |
1374 | rth->u.dst.dev != dev) | |
1375 | break; | |
1376 | ||
1377 | dst_hold(&rth->u.dst); | |
1378 | rcu_read_unlock(); | |
1379 | ||
1380 | rt = dst_alloc(&ipv4_dst_ops); | |
1381 | if (rt == NULL) { | |
1382 | ip_rt_put(rth); | |
1383 | in_dev_put(in_dev); | |
1384 | return; | |
1385 | } | |
1386 | ||
1387 | /* Copy all the information. */ | |
1388 | *rt = *rth; | |
1da177e4 LT |
1389 | rt->u.dst.__use = 1; |
1390 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1391 | rt->u.dst.child = NULL; | |
1392 | if (rt->u.dst.dev) | |
1393 | dev_hold(rt->u.dst.dev); | |
1394 | if (rt->idev) | |
1395 | in_dev_hold(rt->idev); | |
1396 | rt->u.dst.obsolete = 0; | |
1397 | rt->u.dst.lastuse = jiffies; | |
1398 | rt->u.dst.path = &rt->u.dst; | |
1399 | rt->u.dst.neighbour = NULL; | |
1400 | rt->u.dst.hh = NULL; | |
def8b4fa | 1401 | #ifdef CONFIG_XFRM |
1da177e4 | 1402 | rt->u.dst.xfrm = NULL; |
def8b4fa | 1403 | #endif |
e84f84f2 | 1404 | rt->rt_genid = rt_genid(net); |
1da177e4 LT |
1405 | rt->rt_flags |= RTCF_REDIRECTED; |
1406 | ||
1407 | /* Gateway is different ... */ | |
1408 | rt->rt_gateway = new_gw; | |
1409 | ||
1410 | /* Redirect received -> path was valid */ | |
1411 | dst_confirm(&rth->u.dst); | |
1412 | ||
1413 | if (rt->peer) | |
1414 | atomic_inc(&rt->peer->refcnt); | |
1415 | ||
1416 | if (arp_bind_neighbour(&rt->u.dst) || | |
1417 | !(rt->u.dst.neighbour->nud_state & | |
1418 | NUD_VALID)) { | |
1419 | if (rt->u.dst.neighbour) | |
1420 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1421 | ip_rt_put(rth); | |
1422 | rt_drop(rt); | |
1423 | goto do_next; | |
1424 | } | |
e905a9ed | 1425 | |
8d71740c TT |
1426 | netevent.old = &rth->u.dst; |
1427 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1428 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1429 | &netevent); | |
1da177e4 LT |
1430 | |
1431 | rt_del(hash, rth); | |
1432 | if (!rt_intern_hash(hash, rt, &rt)) | |
1433 | ip_rt_put(rt); | |
1434 | goto do_next; | |
1435 | } | |
1436 | rcu_read_unlock(); | |
1437 | do_next: | |
1438 | ; | |
1439 | } | |
1440 | } | |
1441 | in_dev_put(in_dev); | |
1442 | return; | |
1443 | ||
1444 | reject_redirect: | |
1445 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1446 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
a7d632b6 YH |
1447 | printk(KERN_INFO "Redirect from " NIPQUAD_FMT " on %s about " |
1448 | NIPQUAD_FMT " ignored.\n" | |
1449 | " Advised path = " NIPQUAD_FMT " -> " NIPQUAD_FMT "\n", | |
1da177e4 | 1450 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1451 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1452 | #endif |
1453 | in_dev_put(in_dev); | |
1454 | } | |
1455 | ||
1456 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1457 | { | |
ee6b9673 | 1458 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
1459 | struct dst_entry *ret = dst; |
1460 | ||
1461 | if (rt) { | |
1462 | if (dst->obsolete) { | |
1463 | ip_rt_put(rt); | |
1464 | ret = NULL; | |
1465 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1466 | rt->u.dst.expires) { | |
8c7bc840 | 1467 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
b00180de | 1468 | rt->fl.oif, |
e84f84f2 | 1469 | rt_genid(dev_net(dst->dev))); |
1da177e4 | 1470 | #if RT_CACHE_DEBUG >= 1 |
56c99d04 | 1471 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to " |
a7d632b6 | 1472 | NIPQUAD_FMT "/%02x dropped\n", |
1da177e4 LT |
1473 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); |
1474 | #endif | |
1475 | rt_del(hash, rt); | |
1476 | ret = NULL; | |
1477 | } | |
1478 | } | |
1479 | return ret; | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Algorithm: | |
1484 | * 1. The first ip_rt_redirect_number redirects are sent | |
1485 | * with exponential backoff, then we stop sending them at all, | |
1486 | * assuming that the host ignores our redirects. | |
1487 | * 2. If we did not see packets requiring redirects | |
1488 | * during ip_rt_redirect_silence, we assume that the host | |
1489 | * forgot redirected route and start to send redirects again. | |
1490 | * | |
1491 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1492 | * in icmp.c. | |
1493 | * | |
1494 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1495 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1496 | */ | |
1497 | ||
1498 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1499 | { | |
ee6b9673 | 1500 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1501 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
1502 | ||
1503 | if (!in_dev) | |
1504 | return; | |
1505 | ||
1506 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1507 | goto out; | |
1508 | ||
1509 | /* No redirected packets during ip_rt_redirect_silence; | |
1510 | * reset the algorithm. | |
1511 | */ | |
1512 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1513 | rt->u.dst.rate_tokens = 0; | |
1514 | ||
1515 | /* Too many ignored redirects; do not send anything | |
1516 | * set u.dst.rate_last to the last seen redirected packet. | |
1517 | */ | |
1518 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1519 | rt->u.dst.rate_last = jiffies; | |
1520 | goto out; | |
1521 | } | |
1522 | ||
1523 | /* Check for load limit; set rate_last to the latest sent | |
1524 | * redirect. | |
1525 | */ | |
14fb8a76 LY |
1526 | if (rt->u.dst.rate_tokens == 0 || |
1527 | time_after(jiffies, | |
1da177e4 LT |
1528 | (rt->u.dst.rate_last + |
1529 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1530 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1531 | rt->u.dst.rate_last = jiffies; | |
1532 | ++rt->u.dst.rate_tokens; | |
1533 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1534 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1535 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1536 | net_ratelimit()) | |
a7d632b6 YH |
1537 | printk(KERN_WARNING "host " NIPQUAD_FMT "/if%d ignores " |
1538 | "redirects for " NIPQUAD_FMT " to " NIPQUAD_FMT ".\n", | |
1da177e4 LT |
1539 | NIPQUAD(rt->rt_src), rt->rt_iif, |
1540 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1541 | #endif | |
1542 | } | |
1543 | out: | |
e905a9ed | 1544 | in_dev_put(in_dev); |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | static int ip_error(struct sk_buff *skb) | |
1548 | { | |
ee6b9673 | 1549 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1550 | unsigned long now; |
1551 | int code; | |
1552 | ||
1553 | switch (rt->u.dst.error) { | |
1554 | case EINVAL: | |
1555 | default: | |
1556 | goto out; | |
1557 | case EHOSTUNREACH: | |
1558 | code = ICMP_HOST_UNREACH; | |
1559 | break; | |
1560 | case ENETUNREACH: | |
1561 | code = ICMP_NET_UNREACH; | |
7c73a6fa PE |
1562 | IP_INC_STATS_BH(dev_net(rt->u.dst.dev), |
1563 | IPSTATS_MIB_INNOROUTES); | |
1da177e4 LT |
1564 | break; |
1565 | case EACCES: | |
1566 | code = ICMP_PKT_FILTERED; | |
1567 | break; | |
1568 | } | |
1569 | ||
1570 | now = jiffies; | |
1571 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1572 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1573 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1574 | rt->u.dst.rate_last = now; | |
1575 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1576 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1577 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1578 | } | |
1579 | ||
1580 | out: kfree_skb(skb); | |
1581 | return 0; | |
e905a9ed | 1582 | } |
1da177e4 LT |
1583 | |
1584 | /* | |
1585 | * The last two values are not from the RFC but | |
1586 | * are needed for AMPRnet AX.25 paths. | |
1587 | */ | |
1588 | ||
9b5b5cff | 1589 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1590 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1591 | ||
5969f71d | 1592 | static inline unsigned short guess_mtu(unsigned short old_mtu) |
1da177e4 LT |
1593 | { |
1594 | int i; | |
e905a9ed | 1595 | |
1da177e4 LT |
1596 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1597 | if (old_mtu > mtu_plateau[i]) | |
1598 | return mtu_plateau[i]; | |
1599 | return 68; | |
1600 | } | |
1601 | ||
b5921910 | 1602 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
0010e465 TT |
1603 | unsigned short new_mtu, |
1604 | struct net_device *dev) | |
1da177e4 | 1605 | { |
0010e465 | 1606 | int i, k; |
1da177e4 LT |
1607 | unsigned short old_mtu = ntohs(iph->tot_len); |
1608 | struct rtable *rth; | |
0010e465 | 1609 | int ikeys[2] = { dev->ifindex, 0 }; |
e448515c AV |
1610 | __be32 skeys[2] = { iph->saddr, 0, }; |
1611 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1612 | unsigned short est_mtu = 0; |
1613 | ||
1614 | if (ipv4_config.no_pmtu_disc) | |
1615 | return 0; | |
1616 | ||
0010e465 TT |
1617 | for (k = 0; k < 2; k++) { |
1618 | for (i = 0; i < 2; i++) { | |
b00180de | 1619 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k], |
e84f84f2 | 1620 | rt_genid(net)); |
0010e465 TT |
1621 | |
1622 | rcu_read_lock(); | |
1623 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
1624 | rth = rcu_dereference(rth->u.dst.rt_next)) { | |
1da177e4 LT |
1625 | unsigned short mtu = new_mtu; |
1626 | ||
0010e465 TT |
1627 | if (rth->fl.fl4_dst != daddr || |
1628 | rth->fl.fl4_src != skeys[i] || | |
1629 | rth->rt_dst != daddr || | |
1630 | rth->rt_src != iph->saddr || | |
1631 | rth->fl.oif != ikeys[k] || | |
1632 | rth->fl.iif != 0 || | |
1633 | dst_metric_locked(&rth->u.dst, RTAX_MTU) || | |
1634 | !net_eq(dev_net(rth->u.dst.dev), net) || | |
6c3b8fc6 | 1635 | rt_is_expired(rth)) |
0010e465 TT |
1636 | continue; |
1637 | ||
1da177e4 LT |
1638 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
1639 | ||
1640 | /* BSD 4.2 compatibility hack :-( */ | |
1641 | if (mtu == 0 && | |
6d273f8d | 1642 | old_mtu >= dst_mtu(&rth->u.dst) && |
1da177e4 LT |
1643 | old_mtu >= 68 + (iph->ihl << 2)) |
1644 | old_mtu -= iph->ihl << 2; | |
1645 | ||
1646 | mtu = guess_mtu(old_mtu); | |
1647 | } | |
6d273f8d RR |
1648 | if (mtu <= dst_mtu(&rth->u.dst)) { |
1649 | if (mtu < dst_mtu(&rth->u.dst)) { | |
1da177e4 LT |
1650 | dst_confirm(&rth->u.dst); |
1651 | if (mtu < ip_rt_min_pmtu) { | |
1652 | mtu = ip_rt_min_pmtu; | |
1653 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1654 | (1 << RTAX_MTU); | |
1655 | } | |
1656 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1657 | dst_set_expires(&rth->u.dst, | |
1658 | ip_rt_mtu_expires); | |
1659 | } | |
1660 | est_mtu = mtu; | |
1661 | } | |
1662 | } | |
0010e465 | 1663 | rcu_read_unlock(); |
1da177e4 | 1664 | } |
1da177e4 LT |
1665 | } |
1666 | return est_mtu ? : new_mtu; | |
1667 | } | |
1668 | ||
1669 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1670 | { | |
6d273f8d | 1671 | if (dst_mtu(dst) > mtu && mtu >= 68 && |
1da177e4 LT |
1672 | !(dst_metric_locked(dst, RTAX_MTU))) { |
1673 | if (mtu < ip_rt_min_pmtu) { | |
1674 | mtu = ip_rt_min_pmtu; | |
1675 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1676 | } | |
1677 | dst->metrics[RTAX_MTU-1] = mtu; | |
1678 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1679 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1680 | } |
1681 | } | |
1682 | ||
1683 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1684 | { | |
1685 | return NULL; | |
1686 | } | |
1687 | ||
1688 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1689 | { | |
1690 | struct rtable *rt = (struct rtable *) dst; | |
1691 | struct inet_peer *peer = rt->peer; | |
1692 | struct in_device *idev = rt->idev; | |
1693 | ||
1694 | if (peer) { | |
1695 | rt->peer = NULL; | |
1696 | inet_putpeer(peer); | |
1697 | } | |
1698 | ||
1699 | if (idev) { | |
1700 | rt->idev = NULL; | |
1701 | in_dev_put(idev); | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1706 | int how) | |
1707 | { | |
1708 | struct rtable *rt = (struct rtable *) dst; | |
1709 | struct in_device *idev = rt->idev; | |
c346dca1 | 1710 | if (dev != dev_net(dev)->loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 | 1711 | struct in_device *loopback_idev = |
c346dca1 | 1712 | in_dev_get(dev_net(dev)->loopback_dev); |
1da177e4 LT |
1713 | if (loopback_idev) { |
1714 | rt->idev = loopback_idev; | |
1715 | in_dev_put(idev); | |
1716 | } | |
1717 | } | |
1718 | } | |
1719 | ||
1720 | static void ipv4_link_failure(struct sk_buff *skb) | |
1721 | { | |
1722 | struct rtable *rt; | |
1723 | ||
1724 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1725 | ||
ee6b9673 | 1726 | rt = skb->rtable; |
1da177e4 LT |
1727 | if (rt) |
1728 | dst_set_expires(&rt->u.dst, 0); | |
1729 | } | |
1730 | ||
1731 | static int ip_rt_bug(struct sk_buff *skb) | |
1732 | { | |
a7d632b6 | 1733 | printk(KERN_DEBUG "ip_rt_bug: " NIPQUAD_FMT " -> " NIPQUAD_FMT ", %s\n", |
eddc9ec5 | 1734 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
1da177e4 LT |
1735 | skb->dev ? skb->dev->name : "?"); |
1736 | kfree_skb(skb); | |
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | /* | |
1741 | We do not cache source address of outgoing interface, | |
1742 | because it is used only by IP RR, TS and SRR options, | |
1743 | so that it out of fast path. | |
1744 | ||
1745 | BTW remember: "addr" is allowed to be not aligned | |
1746 | in IP options! | |
1747 | */ | |
1748 | ||
1749 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1750 | { | |
a61ced5d | 1751 | __be32 src; |
1da177e4 LT |
1752 | struct fib_result res; |
1753 | ||
1754 | if (rt->fl.iif == 0) | |
1755 | src = rt->rt_src; | |
c346dca1 | 1756 | else if (fib_lookup(dev_net(rt->u.dst.dev), &rt->fl, &res) == 0) { |
1da177e4 LT |
1757 | src = FIB_RES_PREFSRC(res); |
1758 | fib_res_put(&res); | |
1759 | } else | |
1760 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1761 | RT_SCOPE_UNIVERSE); | |
1762 | memcpy(addr, &src, 4); | |
1763 | } | |
1764 | ||
1765 | #ifdef CONFIG_NET_CLS_ROUTE | |
1766 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1767 | { | |
1768 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1769 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1770 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1771 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1772 | } | |
1773 | #endif | |
1774 | ||
1775 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1776 | { | |
1777 | struct fib_info *fi = res->fi; | |
1778 | ||
1779 | if (fi) { | |
1780 | if (FIB_RES_GW(*res) && | |
1781 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1782 | rt->rt_gateway = FIB_RES_GW(*res); | |
1783 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1784 | sizeof(rt->u.dst.metrics)); | |
1785 | if (fi->fib_mtu == 0) { | |
1786 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
0bbeafd0 | 1787 | if (dst_metric_locked(&rt->u.dst, RTAX_MTU) && |
1da177e4 LT |
1788 | rt->rt_gateway != rt->rt_dst && |
1789 | rt->u.dst.dev->mtu > 576) | |
1790 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1791 | } | |
1792 | #ifdef CONFIG_NET_CLS_ROUTE | |
1793 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1794 | #endif | |
1795 | } else | |
1796 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1797 | ||
5ffc02a1 | 1798 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1799 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; |
6d273f8d | 1800 | if (dst_mtu(&rt->u.dst) > IP_MAX_MTU) |
1da177e4 | 1801 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; |
5ffc02a1 | 1802 | if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0) |
1da177e4 LT |
1803 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, |
1804 | ip_rt_min_advmss); | |
5ffc02a1 | 1805 | if (dst_metric(&rt->u.dst, RTAX_ADVMSS) > 65535 - 40) |
1da177e4 LT |
1806 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; |
1807 | ||
1808 | #ifdef CONFIG_NET_CLS_ROUTE | |
1809 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1810 | set_class_tag(rt, fib_rules_tclass(res)); | |
1811 | #endif | |
1812 | set_class_tag(rt, itag); | |
1813 | #endif | |
e905a9ed | 1814 | rt->rt_type = res->type; |
1da177e4 LT |
1815 | } |
1816 | ||
9e12bb22 | 1817 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1818 | u8 tos, struct net_device *dev, int our) |
1819 | { | |
1820 | unsigned hash; | |
1821 | struct rtable *rth; | |
a61ced5d | 1822 | __be32 spec_dst; |
1da177e4 LT |
1823 | struct in_device *in_dev = in_dev_get(dev); |
1824 | u32 itag = 0; | |
1825 | ||
1826 | /* Primary sanity checks. */ | |
1827 | ||
1828 | if (in_dev == NULL) | |
1829 | return -EINVAL; | |
1830 | ||
1e637c74 | 1831 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1832 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1833 | goto e_inval; |
1834 | ||
f97c1e0c JP |
1835 | if (ipv4_is_zeronet(saddr)) { |
1836 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1837 | goto e_inval; |
1838 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1839 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1840 | dev, &spec_dst, &itag) < 0) | |
1841 | goto e_inval; | |
1842 | ||
1843 | rth = dst_alloc(&ipv4_dst_ops); | |
1844 | if (!rth) | |
1845 | goto e_nobufs; | |
1846 | ||
1847 | rth->u.dst.output= ip_rt_bug; | |
1848 | ||
1849 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1850 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1851 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1852 | rth->u.dst.flags |= DST_NOPOLICY; |
1853 | rth->fl.fl4_dst = daddr; | |
1854 | rth->rt_dst = daddr; | |
1855 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1856 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1857 | rth->fl.fl4_src = saddr; |
1858 | rth->rt_src = saddr; | |
1859 | #ifdef CONFIG_NET_CLS_ROUTE | |
1860 | rth->u.dst.tclassid = itag; | |
1861 | #endif | |
1862 | rth->rt_iif = | |
1863 | rth->fl.iif = dev->ifindex; | |
2774c7ab | 1864 | rth->u.dst.dev = init_net.loopback_dev; |
1da177e4 LT |
1865 | dev_hold(rth->u.dst.dev); |
1866 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1867 | rth->fl.oif = 0; | |
1868 | rth->rt_gateway = daddr; | |
1869 | rth->rt_spec_dst= spec_dst; | |
e84f84f2 | 1870 | rth->rt_genid = rt_genid(dev_net(dev)); |
1da177e4 | 1871 | rth->rt_flags = RTCF_MULTICAST; |
29e75252 | 1872 | rth->rt_type = RTN_MULTICAST; |
1da177e4 LT |
1873 | if (our) { |
1874 | rth->u.dst.input= ip_local_deliver; | |
1875 | rth->rt_flags |= RTCF_LOCAL; | |
1876 | } | |
1877 | ||
1878 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1879 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
1da177e4 LT |
1880 | rth->u.dst.input = ip_mr_input; |
1881 | #endif | |
1882 | RT_CACHE_STAT_INC(in_slow_mc); | |
1883 | ||
1884 | in_dev_put(in_dev); | |
e84f84f2 | 1885 | hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev))); |
ee6b9673 | 1886 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1887 | |
1888 | e_nobufs: | |
1889 | in_dev_put(in_dev); | |
1890 | return -ENOBUFS; | |
1891 | ||
1892 | e_inval: | |
1893 | in_dev_put(in_dev); | |
1894 | return -EINVAL; | |
1895 | } | |
1896 | ||
1897 | ||
1898 | static void ip_handle_martian_source(struct net_device *dev, | |
1899 | struct in_device *in_dev, | |
1900 | struct sk_buff *skb, | |
9e12bb22 AV |
1901 | __be32 daddr, |
1902 | __be32 saddr) | |
1da177e4 LT |
1903 | { |
1904 | RT_CACHE_STAT_INC(in_martian_src); | |
1905 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1906 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1907 | /* | |
1908 | * RFC1812 recommendation, if source is martian, | |
1909 | * the only hint is MAC header. | |
1910 | */ | |
a7d632b6 YH |
1911 | printk(KERN_WARNING "martian source " NIPQUAD_FMT " from " |
1912 | NIPQUAD_FMT", on dev %s\n", | |
1da177e4 | 1913 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
98e399f8 | 1914 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1915 | int i; |
98e399f8 | 1916 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1917 | printk(KERN_WARNING "ll header: "); |
1918 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1919 | printk("%02x", *p); | |
1920 | if (i < (dev->hard_header_len - 1)) | |
1921 | printk(":"); | |
1922 | } | |
1923 | printk("\n"); | |
1924 | } | |
1925 | } | |
1926 | #endif | |
1927 | } | |
1928 | ||
5969f71d SH |
1929 | static int __mkroute_input(struct sk_buff *skb, |
1930 | struct fib_result *res, | |
1931 | struct in_device *in_dev, | |
1932 | __be32 daddr, __be32 saddr, u32 tos, | |
1933 | struct rtable **result) | |
1da177e4 LT |
1934 | { |
1935 | ||
1936 | struct rtable *rth; | |
1937 | int err; | |
1938 | struct in_device *out_dev; | |
1939 | unsigned flags = 0; | |
d9c9df8c AV |
1940 | __be32 spec_dst; |
1941 | u32 itag; | |
1da177e4 LT |
1942 | |
1943 | /* get a working reference to the output device */ | |
1944 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1945 | if (out_dev == NULL) { | |
1946 | if (net_ratelimit()) | |
1947 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1948 | "_slow(). Please, report\n"); | |
1949 | return -EINVAL; | |
1950 | } | |
1951 | ||
1952 | ||
e905a9ed | 1953 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1954 | in_dev->dev, &spec_dst, &itag); |
1955 | if (err < 0) { | |
e905a9ed | 1956 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1957 | saddr); |
e905a9ed | 1958 | |
1da177e4 LT |
1959 | err = -EINVAL; |
1960 | goto cleanup; | |
1961 | } | |
1962 | ||
1963 | if (err) | |
1964 | flags |= RTCF_DIRECTSRC; | |
1965 | ||
51b77cae | 1966 | if (out_dev == in_dev && err && |
1da177e4 LT |
1967 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1968 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1969 | flags |= RTCF_DOREDIRECT; | |
1970 | ||
1971 | if (skb->protocol != htons(ETH_P_IP)) { | |
1972 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1973 | * invalid for proxy arp. DNAT routes are always valid. | |
1974 | */ | |
cb7928a5 | 1975 | if (out_dev == in_dev) { |
1da177e4 LT |
1976 | err = -EINVAL; |
1977 | goto cleanup; | |
1978 | } | |
1979 | } | |
1980 | ||
1981 | ||
1982 | rth = dst_alloc(&ipv4_dst_ops); | |
1983 | if (!rth) { | |
1984 | err = -ENOBUFS; | |
1985 | goto cleanup; | |
1986 | } | |
1987 | ||
ce723d8e | 1988 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1989 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1990 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1991 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1992 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1993 | rth->u.dst.flags |= DST_NOXFRM; |
1994 | rth->fl.fl4_dst = daddr; | |
1995 | rth->rt_dst = daddr; | |
1996 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1997 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1998 | rth->fl.fl4_src = saddr; |
1999 | rth->rt_src = saddr; | |
2000 | rth->rt_gateway = daddr; | |
2001 | rth->rt_iif = | |
2002 | rth->fl.iif = in_dev->dev->ifindex; | |
2003 | rth->u.dst.dev = (out_dev)->dev; | |
2004 | dev_hold(rth->u.dst.dev); | |
2005 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2006 | rth->fl.oif = 0; | |
2007 | rth->rt_spec_dst= spec_dst; | |
2008 | ||
2009 | rth->u.dst.input = ip_forward; | |
2010 | rth->u.dst.output = ip_output; | |
e84f84f2 | 2011 | rth->rt_genid = rt_genid(dev_net(rth->u.dst.dev)); |
1da177e4 LT |
2012 | |
2013 | rt_set_nexthop(rth, res, itag); | |
2014 | ||
2015 | rth->rt_flags = flags; | |
2016 | ||
2017 | *result = rth; | |
2018 | err = 0; | |
2019 | cleanup: | |
2020 | /* release the working reference to the output device */ | |
2021 | in_dev_put(out_dev); | |
2022 | return err; | |
e905a9ed | 2023 | } |
1da177e4 | 2024 | |
5969f71d SH |
2025 | static int ip_mkroute_input(struct sk_buff *skb, |
2026 | struct fib_result *res, | |
2027 | const struct flowi *fl, | |
2028 | struct in_device *in_dev, | |
2029 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 2030 | { |
7abaa27c | 2031 | struct rtable* rth = NULL; |
1da177e4 LT |
2032 | int err; |
2033 | unsigned hash; | |
2034 | ||
2035 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2036 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
2037 | fib_select_multipath(fl, res); | |
2038 | #endif | |
2039 | ||
2040 | /* create a routing cache entry */ | |
2041 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
2042 | if (err) | |
2043 | return err; | |
1da177e4 LT |
2044 | |
2045 | /* put it into the cache */ | |
e84f84f2 DL |
2046 | hash = rt_hash(daddr, saddr, fl->iif, |
2047 | rt_genid(dev_net(rth->u.dst.dev))); | |
ee6b9673 | 2048 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2049 | } |
2050 | ||
1da177e4 LT |
2051 | /* |
2052 | * NOTE. We drop all the packets that has local source | |
2053 | * addresses, because every properly looped back packet | |
2054 | * must have correct destination already attached by output routine. | |
2055 | * | |
2056 | * Such approach solves two big problems: | |
2057 | * 1. Not simplex devices are handled properly. | |
2058 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
2059 | */ | |
2060 | ||
9e12bb22 | 2061 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2062 | u8 tos, struct net_device *dev) |
2063 | { | |
2064 | struct fib_result res; | |
2065 | struct in_device *in_dev = in_dev_get(dev); | |
2066 | struct flowi fl = { .nl_u = { .ip4_u = | |
2067 | { .daddr = daddr, | |
2068 | .saddr = saddr, | |
2069 | .tos = tos, | |
2070 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 2071 | } }, |
47dcf0cb | 2072 | .mark = skb->mark, |
1da177e4 LT |
2073 | .iif = dev->ifindex }; |
2074 | unsigned flags = 0; | |
2075 | u32 itag = 0; | |
2076 | struct rtable * rth; | |
2077 | unsigned hash; | |
9e12bb22 | 2078 | __be32 spec_dst; |
1da177e4 LT |
2079 | int err = -EINVAL; |
2080 | int free_res = 0; | |
c346dca1 | 2081 | struct net * net = dev_net(dev); |
1da177e4 LT |
2082 | |
2083 | /* IP on this device is disabled. */ | |
2084 | ||
2085 | if (!in_dev) | |
2086 | goto out; | |
2087 | ||
2088 | /* Check for the most weird martians, which can be not detected | |
2089 | by fib_lookup. | |
2090 | */ | |
2091 | ||
1e637c74 | 2092 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 2093 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
2094 | goto martian_source; |
2095 | ||
e448515c | 2096 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2097 | goto brd_input; |
2098 | ||
2099 | /* Accept zero addresses only to limited broadcast; | |
2100 | * I even do not know to fix it or not. Waiting for complains :-) | |
2101 | */ | |
f97c1e0c | 2102 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2103 | goto martian_source; |
2104 | ||
1e637c74 | 2105 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
f97c1e0c | 2106 | ipv4_is_loopback(daddr)) |
1da177e4 LT |
2107 | goto martian_destination; |
2108 | ||
2109 | /* | |
2110 | * Now we are ready to route packet. | |
2111 | */ | |
84a885f4 | 2112 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
1da177e4 | 2113 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 2114 | goto e_hostunreach; |
1da177e4 LT |
2115 | goto no_route; |
2116 | } | |
2117 | free_res = 1; | |
2118 | ||
2119 | RT_CACHE_STAT_INC(in_slow_tot); | |
2120 | ||
2121 | if (res.type == RTN_BROADCAST) | |
2122 | goto brd_input; | |
2123 | ||
2124 | if (res.type == RTN_LOCAL) { | |
2125 | int result; | |
2126 | result = fib_validate_source(saddr, daddr, tos, | |
84a885f4 | 2127 | net->loopback_dev->ifindex, |
1da177e4 LT |
2128 | dev, &spec_dst, &itag); |
2129 | if (result < 0) | |
2130 | goto martian_source; | |
2131 | if (result) | |
2132 | flags |= RTCF_DIRECTSRC; | |
2133 | spec_dst = daddr; | |
2134 | goto local_input; | |
2135 | } | |
2136 | ||
2137 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 2138 | goto e_hostunreach; |
1da177e4 LT |
2139 | if (res.type != RTN_UNICAST) |
2140 | goto martian_destination; | |
2141 | ||
2142 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1da177e4 LT |
2143 | done: |
2144 | in_dev_put(in_dev); | |
2145 | if (free_res) | |
2146 | fib_res_put(&res); | |
2147 | out: return err; | |
2148 | ||
2149 | brd_input: | |
2150 | if (skb->protocol != htons(ETH_P_IP)) | |
2151 | goto e_inval; | |
2152 | ||
f97c1e0c | 2153 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2154 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
2155 | else { | |
2156 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
2157 | &itag); | |
2158 | if (err < 0) | |
2159 | goto martian_source; | |
2160 | if (err) | |
2161 | flags |= RTCF_DIRECTSRC; | |
2162 | } | |
2163 | flags |= RTCF_BROADCAST; | |
2164 | res.type = RTN_BROADCAST; | |
2165 | RT_CACHE_STAT_INC(in_brd); | |
2166 | ||
2167 | local_input: | |
2168 | rth = dst_alloc(&ipv4_dst_ops); | |
2169 | if (!rth) | |
2170 | goto e_nobufs; | |
2171 | ||
2172 | rth->u.dst.output= ip_rt_bug; | |
e84f84f2 | 2173 | rth->rt_genid = rt_genid(net); |
1da177e4 LT |
2174 | |
2175 | atomic_set(&rth->u.dst.__refcnt, 1); | |
2176 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 2177 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2178 | rth->u.dst.flags |= DST_NOPOLICY; |
2179 | rth->fl.fl4_dst = daddr; | |
2180 | rth->rt_dst = daddr; | |
2181 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 2182 | rth->fl.mark = skb->mark; |
1da177e4 LT |
2183 | rth->fl.fl4_src = saddr; |
2184 | rth->rt_src = saddr; | |
2185 | #ifdef CONFIG_NET_CLS_ROUTE | |
2186 | rth->u.dst.tclassid = itag; | |
2187 | #endif | |
2188 | rth->rt_iif = | |
2189 | rth->fl.iif = dev->ifindex; | |
84a885f4 | 2190 | rth->u.dst.dev = net->loopback_dev; |
1da177e4 LT |
2191 | dev_hold(rth->u.dst.dev); |
2192 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2193 | rth->rt_gateway = daddr; | |
2194 | rth->rt_spec_dst= spec_dst; | |
2195 | rth->u.dst.input= ip_local_deliver; | |
2196 | rth->rt_flags = flags|RTCF_LOCAL; | |
2197 | if (res.type == RTN_UNREACHABLE) { | |
2198 | rth->u.dst.input= ip_error; | |
2199 | rth->u.dst.error= -err; | |
2200 | rth->rt_flags &= ~RTCF_LOCAL; | |
2201 | } | |
2202 | rth->rt_type = res.type; | |
e84f84f2 | 2203 | hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net)); |
ee6b9673 | 2204 | err = rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2205 | goto done; |
2206 | ||
2207 | no_route: | |
2208 | RT_CACHE_STAT_INC(in_no_route); | |
2209 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2210 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2211 | if (err == -ESRCH) |
2212 | err = -ENETUNREACH; | |
1da177e4 LT |
2213 | goto local_input; |
2214 | ||
2215 | /* | |
2216 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2217 | */ | |
2218 | martian_destination: | |
2219 | RT_CACHE_STAT_INC(in_martian_dst); | |
2220 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2221 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
a7d632b6 YH |
2222 | printk(KERN_WARNING "martian destination " NIPQUAD_FMT " from " |
2223 | NIPQUAD_FMT ", dev %s\n", | |
1da177e4 LT |
2224 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
2225 | #endif | |
2c2910a4 DE |
2226 | |
2227 | e_hostunreach: | |
e905a9ed YH |
2228 | err = -EHOSTUNREACH; |
2229 | goto done; | |
2c2910a4 | 2230 | |
1da177e4 LT |
2231 | e_inval: |
2232 | err = -EINVAL; | |
2233 | goto done; | |
2234 | ||
2235 | e_nobufs: | |
2236 | err = -ENOBUFS; | |
2237 | goto done; | |
2238 | ||
2239 | martian_source: | |
2240 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2241 | goto e_inval; | |
2242 | } | |
2243 | ||
9e12bb22 | 2244 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2245 | u8 tos, struct net_device *dev) |
2246 | { | |
2247 | struct rtable * rth; | |
2248 | unsigned hash; | |
2249 | int iif = dev->ifindex; | |
b5921910 | 2250 | struct net *net; |
1da177e4 | 2251 | |
c346dca1 | 2252 | net = dev_net(dev); |
1080d709 NH |
2253 | |
2254 | if (!rt_caching(net)) | |
2255 | goto skip_cache; | |
2256 | ||
1da177e4 | 2257 | tos &= IPTOS_RT_MASK; |
e84f84f2 | 2258 | hash = rt_hash(daddr, saddr, iif, rt_genid(net)); |
1da177e4 LT |
2259 | |
2260 | rcu_read_lock(); | |
2261 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2262 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
c0b8c32b SH |
2263 | if (((rth->fl.fl4_dst ^ daddr) | |
2264 | (rth->fl.fl4_src ^ saddr) | | |
2265 | (rth->fl.iif ^ iif) | | |
2266 | rth->fl.oif | | |
2267 | (rth->fl.fl4_tos ^ tos)) == 0 && | |
47dcf0cb | 2268 | rth->fl.mark == skb->mark && |
878628fb | 2269 | net_eq(dev_net(rth->u.dst.dev), net) && |
e84f84f2 | 2270 | !rt_is_expired(rth)) { |
03f49f34 | 2271 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2272 | RT_CACHE_STAT_INC(in_hit); |
2273 | rcu_read_unlock(); | |
ee6b9673 | 2274 | skb->rtable = rth; |
1da177e4 LT |
2275 | return 0; |
2276 | } | |
2277 | RT_CACHE_STAT_INC(in_hlist_search); | |
2278 | } | |
2279 | rcu_read_unlock(); | |
2280 | ||
1080d709 | 2281 | skip_cache: |
1da177e4 LT |
2282 | /* Multicast recognition logic is moved from route cache to here. |
2283 | The problem was that too many Ethernet cards have broken/missing | |
2284 | hardware multicast filters :-( As result the host on multicasting | |
2285 | network acquires a lot of useless route cache entries, sort of | |
2286 | SDR messages from all the world. Now we try to get rid of them. | |
2287 | Really, provided software IP multicast filter is organized | |
2288 | reasonably (at least, hashed), it does not result in a slowdown | |
2289 | comparing with route cache reject entries. | |
2290 | Note, that multicast routers are not affected, because | |
2291 | route cache entry is created eventually. | |
2292 | */ | |
f97c1e0c | 2293 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
2294 | struct in_device *in_dev; |
2295 | ||
2296 | rcu_read_lock(); | |
e5ed6399 | 2297 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 2298 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 2299 | ip_hdr(skb)->protocol); |
1da177e4 LT |
2300 | if (our |
2301 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c JP |
2302 | || (!ipv4_is_local_multicast(daddr) && |
2303 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 LT |
2304 | #endif |
2305 | ) { | |
2306 | rcu_read_unlock(); | |
2307 | return ip_route_input_mc(skb, daddr, saddr, | |
2308 | tos, dev, our); | |
2309 | } | |
2310 | } | |
2311 | rcu_read_unlock(); | |
2312 | return -EINVAL; | |
2313 | } | |
2314 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2315 | } | |
2316 | ||
5969f71d SH |
2317 | static int __mkroute_output(struct rtable **result, |
2318 | struct fib_result *res, | |
2319 | const struct flowi *fl, | |
2320 | const struct flowi *oldflp, | |
2321 | struct net_device *dev_out, | |
2322 | unsigned flags) | |
1da177e4 LT |
2323 | { |
2324 | struct rtable *rth; | |
2325 | struct in_device *in_dev; | |
2326 | u32 tos = RT_FL_TOS(oldflp); | |
2327 | int err = 0; | |
2328 | ||
f97c1e0c | 2329 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
1da177e4 LT |
2330 | return -EINVAL; |
2331 | ||
e448515c | 2332 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 | 2333 | res->type = RTN_BROADCAST; |
f97c1e0c | 2334 | else if (ipv4_is_multicast(fl->fl4_dst)) |
1da177e4 | 2335 | res->type = RTN_MULTICAST; |
1e637c74 | 2336 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
1da177e4 LT |
2337 | return -EINVAL; |
2338 | ||
2339 | if (dev_out->flags & IFF_LOOPBACK) | |
2340 | flags |= RTCF_LOCAL; | |
2341 | ||
2342 | /* get work reference to inet device */ | |
2343 | in_dev = in_dev_get(dev_out); | |
2344 | if (!in_dev) | |
2345 | return -EINVAL; | |
2346 | ||
2347 | if (res->type == RTN_BROADCAST) { | |
2348 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2349 | if (res->fi) { | |
2350 | fib_info_put(res->fi); | |
2351 | res->fi = NULL; | |
2352 | } | |
2353 | } else if (res->type == RTN_MULTICAST) { | |
2354 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2355 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2356 | oldflp->proto)) |
2357 | flags &= ~RTCF_LOCAL; | |
2358 | /* If multicast route do not exist use | |
2359 | default one, but do not gateway in this case. | |
2360 | Yes, it is hack. | |
2361 | */ | |
2362 | if (res->fi && res->prefixlen < 4) { | |
2363 | fib_info_put(res->fi); | |
2364 | res->fi = NULL; | |
2365 | } | |
2366 | } | |
2367 | ||
2368 | ||
2369 | rth = dst_alloc(&ipv4_dst_ops); | |
2370 | if (!rth) { | |
2371 | err = -ENOBUFS; | |
2372 | goto cleanup; | |
e905a9ed | 2373 | } |
1da177e4 | 2374 | |
ce723d8e | 2375 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2376 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2377 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2378 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2379 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2380 | rth->u.dst.flags |= DST_NOPOLICY; |
2381 | ||
2382 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2383 | rth->fl.fl4_tos = tos; | |
2384 | rth->fl.fl4_src = oldflp->fl4_src; | |
2385 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2386 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2387 | rth->rt_dst = fl->fl4_dst; |
2388 | rth->rt_src = fl->fl4_src; | |
2389 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2390 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2391 | cache entry */ |
2392 | rth->u.dst.dev = dev_out; | |
2393 | dev_hold(dev_out); | |
2394 | rth->idev = in_dev_get(dev_out); | |
2395 | rth->rt_gateway = fl->fl4_dst; | |
2396 | rth->rt_spec_dst= fl->fl4_src; | |
2397 | ||
2398 | rth->u.dst.output=ip_output; | |
e84f84f2 | 2399 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
1da177e4 LT |
2400 | |
2401 | RT_CACHE_STAT_INC(out_slow_tot); | |
2402 | ||
2403 | if (flags & RTCF_LOCAL) { | |
2404 | rth->u.dst.input = ip_local_deliver; | |
2405 | rth->rt_spec_dst = fl->fl4_dst; | |
2406 | } | |
2407 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2408 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2409 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2410 | !(dev_out->flags & IFF_LOOPBACK)) { |
2411 | rth->u.dst.output = ip_mc_output; | |
2412 | RT_CACHE_STAT_INC(out_slow_mc); | |
2413 | } | |
2414 | #ifdef CONFIG_IP_MROUTE | |
2415 | if (res->type == RTN_MULTICAST) { | |
2416 | if (IN_DEV_MFORWARD(in_dev) && | |
f97c1e0c | 2417 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
1da177e4 LT |
2418 | rth->u.dst.input = ip_mr_input; |
2419 | rth->u.dst.output = ip_mc_output; | |
2420 | } | |
2421 | } | |
2422 | #endif | |
2423 | } | |
2424 | ||
2425 | rt_set_nexthop(rth, res, 0); | |
2426 | ||
2427 | rth->rt_flags = flags; | |
2428 | ||
2429 | *result = rth; | |
2430 | cleanup: | |
2431 | /* release work reference to inet device */ | |
2432 | in_dev_put(in_dev); | |
2433 | ||
2434 | return err; | |
2435 | } | |
2436 | ||
5969f71d SH |
2437 | static int ip_mkroute_output(struct rtable **rp, |
2438 | struct fib_result *res, | |
2439 | const struct flowi *fl, | |
2440 | const struct flowi *oldflp, | |
2441 | struct net_device *dev_out, | |
2442 | unsigned flags) | |
1da177e4 | 2443 | { |
7abaa27c | 2444 | struct rtable *rth = NULL; |
1da177e4 LT |
2445 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2446 | unsigned hash; | |
2447 | if (err == 0) { | |
b00180de | 2448 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif, |
e84f84f2 | 2449 | rt_genid(dev_net(dev_out))); |
1da177e4 LT |
2450 | err = rt_intern_hash(hash, rth, rp); |
2451 | } | |
e905a9ed | 2452 | |
1da177e4 LT |
2453 | return err; |
2454 | } | |
2455 | ||
1da177e4 LT |
2456 | /* |
2457 | * Major route resolver routine. | |
2458 | */ | |
2459 | ||
b40afd0e DL |
2460 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
2461 | const struct flowi *oldflp) | |
1da177e4 LT |
2462 | { |
2463 | u32 tos = RT_FL_TOS(oldflp); | |
2464 | struct flowi fl = { .nl_u = { .ip4_u = | |
2465 | { .daddr = oldflp->fl4_dst, | |
2466 | .saddr = oldflp->fl4_src, | |
2467 | .tos = tos & IPTOS_RT_MASK, | |
2468 | .scope = ((tos & RTO_ONLINK) ? | |
2469 | RT_SCOPE_LINK : | |
2470 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2471 | } }, |
47dcf0cb | 2472 | .mark = oldflp->mark, |
b40afd0e | 2473 | .iif = net->loopback_dev->ifindex, |
1da177e4 LT |
2474 | .oif = oldflp->oif }; |
2475 | struct fib_result res; | |
2476 | unsigned flags = 0; | |
2477 | struct net_device *dev_out = NULL; | |
2478 | int free_res = 0; | |
2479 | int err; | |
2480 | ||
2481 | ||
2482 | res.fi = NULL; | |
2483 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2484 | res.r = NULL; | |
2485 | #endif | |
2486 | ||
2487 | if (oldflp->fl4_src) { | |
2488 | err = -EINVAL; | |
f97c1e0c | 2489 | if (ipv4_is_multicast(oldflp->fl4_src) || |
1e637c74 | 2490 | ipv4_is_lbcast(oldflp->fl4_src) || |
f97c1e0c | 2491 | ipv4_is_zeronet(oldflp->fl4_src)) |
1da177e4 LT |
2492 | goto out; |
2493 | ||
1da177e4 LT |
2494 | /* I removed check for oif == dev_out->oif here. |
2495 | It was wrong for two reasons: | |
1ab35276 DL |
2496 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2497 | is assigned to multiple interfaces. | |
1da177e4 LT |
2498 | 2. Moreover, we are allowed to send packets with saddr |
2499 | of another iface. --ANK | |
2500 | */ | |
2501 | ||
f6c5d736 | 2502 | if (oldflp->oif == 0 |
f97c1e0c JP |
2503 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
2504 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { | |
a210d01a JA |
2505 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
2506 | dev_out = ip_dev_find(net, oldflp->fl4_src); | |
2507 | if (dev_out == NULL) | |
2508 | goto out; | |
2509 | ||
1da177e4 LT |
2510 | /* Special hack: user can direct multicasts |
2511 | and limited broadcast via necessary interface | |
2512 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2513 | This hack is not just for fun, it allows | |
2514 | vic,vat and friends to work. | |
2515 | They bind socket to loopback, set ttl to zero | |
2516 | and expect that it will work. | |
2517 | From the viewpoint of routing cache they are broken, | |
2518 | because we are not allowed to build multicast path | |
2519 | with loopback source addr (look, routing cache | |
2520 | cannot know, that ttl is zero, so that packet | |
2521 | will not leave this host and route is valid). | |
2522 | Luckily, this hack is good workaround. | |
2523 | */ | |
2524 | ||
2525 | fl.oif = dev_out->ifindex; | |
2526 | goto make_route; | |
2527 | } | |
a210d01a JA |
2528 | |
2529 | if (!(oldflp->flags & FLOWI_FLAG_ANYSRC)) { | |
2530 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
2531 | dev_out = ip_dev_find(net, oldflp->fl4_src); | |
2532 | if (dev_out == NULL) | |
2533 | goto out; | |
1da177e4 | 2534 | dev_put(dev_out); |
a210d01a JA |
2535 | dev_out = NULL; |
2536 | } | |
1da177e4 LT |
2537 | } |
2538 | ||
2539 | ||
2540 | if (oldflp->oif) { | |
b40afd0e | 2541 | dev_out = dev_get_by_index(net, oldflp->oif); |
1da177e4 LT |
2542 | err = -ENODEV; |
2543 | if (dev_out == NULL) | |
2544 | goto out; | |
e5ed6399 HX |
2545 | |
2546 | /* RACE: Check return value of inet_select_addr instead. */ | |
2547 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2548 | dev_put(dev_out); |
2549 | goto out; /* Wrong error code */ | |
2550 | } | |
2551 | ||
f97c1e0c JP |
2552 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
2553 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { | |
1da177e4 LT |
2554 | if (!fl.fl4_src) |
2555 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2556 | RT_SCOPE_LINK); | |
2557 | goto make_route; | |
2558 | } | |
2559 | if (!fl.fl4_src) { | |
f97c1e0c | 2560 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
1da177e4 LT |
2561 | fl.fl4_src = inet_select_addr(dev_out, 0, |
2562 | fl.fl4_scope); | |
2563 | else if (!oldflp->fl4_dst) | |
2564 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2565 | RT_SCOPE_HOST); | |
2566 | } | |
2567 | } | |
2568 | ||
2569 | if (!fl.fl4_dst) { | |
2570 | fl.fl4_dst = fl.fl4_src; | |
2571 | if (!fl.fl4_dst) | |
2572 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2573 | if (dev_out) | |
2574 | dev_put(dev_out); | |
b40afd0e | 2575 | dev_out = net->loopback_dev; |
1da177e4 | 2576 | dev_hold(dev_out); |
b40afd0e | 2577 | fl.oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2578 | res.type = RTN_LOCAL; |
2579 | flags |= RTCF_LOCAL; | |
2580 | goto make_route; | |
2581 | } | |
2582 | ||
b40afd0e | 2583 | if (fib_lookup(net, &fl, &res)) { |
1da177e4 LT |
2584 | res.fi = NULL; |
2585 | if (oldflp->oif) { | |
2586 | /* Apparently, routing tables are wrong. Assume, | |
2587 | that the destination is on link. | |
2588 | ||
2589 | WHY? DW. | |
2590 | Because we are allowed to send to iface | |
2591 | even if it has NO routes and NO assigned | |
2592 | addresses. When oif is specified, routing | |
2593 | tables are looked up with only one purpose: | |
2594 | to catch if destination is gatewayed, rather than | |
2595 | direct. Moreover, if MSG_DONTROUTE is set, | |
2596 | we send packet, ignoring both routing tables | |
2597 | and ifaddr state. --ANK | |
2598 | ||
2599 | ||
2600 | We could make it even if oif is unknown, | |
2601 | likely IPv6, but we do not. | |
2602 | */ | |
2603 | ||
2604 | if (fl.fl4_src == 0) | |
2605 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2606 | RT_SCOPE_LINK); | |
2607 | res.type = RTN_UNICAST; | |
2608 | goto make_route; | |
2609 | } | |
2610 | if (dev_out) | |
2611 | dev_put(dev_out); | |
2612 | err = -ENETUNREACH; | |
2613 | goto out; | |
2614 | } | |
2615 | free_res = 1; | |
2616 | ||
2617 | if (res.type == RTN_LOCAL) { | |
2618 | if (!fl.fl4_src) | |
2619 | fl.fl4_src = fl.fl4_dst; | |
2620 | if (dev_out) | |
2621 | dev_put(dev_out); | |
b40afd0e | 2622 | dev_out = net->loopback_dev; |
1da177e4 LT |
2623 | dev_hold(dev_out); |
2624 | fl.oif = dev_out->ifindex; | |
2625 | if (res.fi) | |
2626 | fib_info_put(res.fi); | |
2627 | res.fi = NULL; | |
2628 | flags |= RTCF_LOCAL; | |
2629 | goto make_route; | |
2630 | } | |
2631 | ||
2632 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2633 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2634 | fib_select_multipath(&fl, &res); | |
2635 | else | |
2636 | #endif | |
2637 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
b40afd0e | 2638 | fib_select_default(net, &fl, &res); |
1da177e4 LT |
2639 | |
2640 | if (!fl.fl4_src) | |
2641 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2642 | ||
2643 | if (dev_out) | |
2644 | dev_put(dev_out); | |
2645 | dev_out = FIB_RES_DEV(res); | |
2646 | dev_hold(dev_out); | |
2647 | fl.oif = dev_out->ifindex; | |
2648 | ||
2649 | ||
2650 | make_route: | |
2651 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2652 | ||
2653 | ||
2654 | if (free_res) | |
2655 | fib_res_put(&res); | |
2656 | if (dev_out) | |
2657 | dev_put(dev_out); | |
2658 | out: return err; | |
2659 | } | |
2660 | ||
611c183e DL |
2661 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
2662 | const struct flowi *flp) | |
1da177e4 LT |
2663 | { |
2664 | unsigned hash; | |
2665 | struct rtable *rth; | |
2666 | ||
1080d709 NH |
2667 | if (!rt_caching(net)) |
2668 | goto slow_output; | |
2669 | ||
e84f84f2 | 2670 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif, rt_genid(net)); |
1da177e4 LT |
2671 | |
2672 | rcu_read_lock_bh(); | |
2673 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2674 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2675 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2676 | rth->fl.fl4_src == flp->fl4_src && | |
2677 | rth->fl.iif == 0 && | |
2678 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2679 | rth->fl.mark == flp->mark && |
1da177e4 | 2680 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
b5921910 | 2681 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
878628fb | 2682 | net_eq(dev_net(rth->u.dst.dev), net) && |
e84f84f2 | 2683 | !rt_is_expired(rth)) { |
03f49f34 | 2684 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2685 | RT_CACHE_STAT_INC(out_hit); |
2686 | rcu_read_unlock_bh(); | |
2687 | *rp = rth; | |
2688 | return 0; | |
2689 | } | |
2690 | RT_CACHE_STAT_INC(out_hlist_search); | |
2691 | } | |
2692 | rcu_read_unlock_bh(); | |
2693 | ||
1080d709 | 2694 | slow_output: |
611c183e | 2695 | return ip_route_output_slow(net, rp, flp); |
1da177e4 LT |
2696 | } |
2697 | ||
d8c97a94 ACM |
2698 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2699 | ||
14e50e57 DM |
2700 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2701 | { | |
2702 | } | |
2703 | ||
2704 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2705 | .family = AF_INET, | |
2706 | .protocol = __constant_htons(ETH_P_IP), | |
2707 | .destroy = ipv4_dst_destroy, | |
2708 | .check = ipv4_dst_check, | |
2709 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
2710 | .entry_size = sizeof(struct rtable), | |
e2422970 | 2711 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
2712 | }; |
2713 | ||
2714 | ||
e84f84f2 | 2715 | static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi *flp) |
14e50e57 DM |
2716 | { |
2717 | struct rtable *ort = *rp; | |
2718 | struct rtable *rt = (struct rtable *) | |
2719 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2720 | ||
2721 | if (rt) { | |
2722 | struct dst_entry *new = &rt->u.dst; | |
2723 | ||
2724 | atomic_set(&new->__refcnt, 1); | |
2725 | new->__use = 1; | |
352e512c HX |
2726 | new->input = dst_discard; |
2727 | new->output = dst_discard; | |
14e50e57 DM |
2728 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
2729 | ||
2730 | new->dev = ort->u.dst.dev; | |
2731 | if (new->dev) | |
2732 | dev_hold(new->dev); | |
2733 | ||
2734 | rt->fl = ort->fl; | |
2735 | ||
2736 | rt->idev = ort->idev; | |
2737 | if (rt->idev) | |
2738 | in_dev_hold(rt->idev); | |
e84f84f2 | 2739 | rt->rt_genid = rt_genid(net); |
14e50e57 DM |
2740 | rt->rt_flags = ort->rt_flags; |
2741 | rt->rt_type = ort->rt_type; | |
2742 | rt->rt_dst = ort->rt_dst; | |
2743 | rt->rt_src = ort->rt_src; | |
2744 | rt->rt_iif = ort->rt_iif; | |
2745 | rt->rt_gateway = ort->rt_gateway; | |
2746 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2747 | rt->peer = ort->peer; | |
2748 | if (rt->peer) | |
2749 | atomic_inc(&rt->peer->refcnt); | |
2750 | ||
2751 | dst_free(new); | |
2752 | } | |
2753 | ||
2754 | dst_release(&(*rp)->u.dst); | |
2755 | *rp = rt; | |
2756 | return (rt ? 0 : -ENOMEM); | |
2757 | } | |
2758 | ||
f1b050bf DL |
2759 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
2760 | struct sock *sk, int flags) | |
1da177e4 LT |
2761 | { |
2762 | int err; | |
2763 | ||
f1b050bf | 2764 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
1da177e4 LT |
2765 | return err; |
2766 | ||
2767 | if (flp->proto) { | |
2768 | if (!flp->fl4_src) | |
2769 | flp->fl4_src = (*rp)->rt_src; | |
2770 | if (!flp->fl4_dst) | |
2771 | flp->fl4_dst = (*rp)->rt_dst; | |
bb72845e HX |
2772 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, |
2773 | flags ? XFRM_LOOKUP_WAIT : 0); | |
14e50e57 | 2774 | if (err == -EREMOTE) |
e84f84f2 | 2775 | err = ipv4_dst_blackhole(net, rp, flp); |
14e50e57 DM |
2776 | |
2777 | return err; | |
1da177e4 LT |
2778 | } |
2779 | ||
2780 | return 0; | |
2781 | } | |
2782 | ||
d8c97a94 ACM |
2783 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2784 | ||
f206351a | 2785 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
1da177e4 | 2786 | { |
f206351a | 2787 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
1da177e4 LT |
2788 | } |
2789 | ||
2790 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2791 | int nowait, unsigned int flags) |
1da177e4 | 2792 | { |
ee6b9673 | 2793 | struct rtable *rt = skb->rtable; |
1da177e4 | 2794 | struct rtmsg *r; |
be403ea1 | 2795 | struct nlmsghdr *nlh; |
e3703b3d TG |
2796 | long expires; |
2797 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2798 | |
2799 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2800 | if (nlh == NULL) | |
26932566 | 2801 | return -EMSGSIZE; |
be403ea1 TG |
2802 | |
2803 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2804 | r->rtm_family = AF_INET; |
2805 | r->rtm_dst_len = 32; | |
2806 | r->rtm_src_len = 0; | |
2807 | r->rtm_tos = rt->fl.fl4_tos; | |
2808 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2809 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2810 | r->rtm_type = rt->rt_type; |
2811 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2812 | r->rtm_protocol = RTPROT_UNSPEC; | |
2813 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2814 | if (rt->rt_flags & RTCF_NOTIFY) | |
2815 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2816 | |
17fb2c64 | 2817 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2818 | |
1da177e4 LT |
2819 | if (rt->fl.fl4_src) { |
2820 | r->rtm_src_len = 32; | |
17fb2c64 | 2821 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2822 | } |
2823 | if (rt->u.dst.dev) | |
be403ea1 | 2824 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2825 | #ifdef CONFIG_NET_CLS_ROUTE |
2826 | if (rt->u.dst.tclassid) | |
be403ea1 | 2827 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2828 | #endif |
2829 | if (rt->fl.iif) | |
17fb2c64 | 2830 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2831 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2832 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2833 | |
1da177e4 | 2834 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2835 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2836 | |
1da177e4 | 2837 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2838 | goto nla_put_failure; |
2839 | ||
e3703b3d TG |
2840 | error = rt->u.dst.error; |
2841 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2842 | if (rt->peer) { |
e3703b3d | 2843 | id = rt->peer->ip_id_count; |
1da177e4 | 2844 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2845 | ts = rt->peer->tcp_ts; |
9d729f72 | 2846 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2847 | } |
2848 | } | |
be403ea1 | 2849 | |
1da177e4 LT |
2850 | if (rt->fl.iif) { |
2851 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2852 | __be32 dst = rt->rt_dst; |
1da177e4 | 2853 | |
f97c1e0c | 2854 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
586f1211 | 2855 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
1da177e4 LT |
2856 | int err = ipmr_get_route(skb, r, nowait); |
2857 | if (err <= 0) { | |
2858 | if (!nowait) { | |
2859 | if (err == 0) | |
2860 | return 0; | |
be403ea1 | 2861 | goto nla_put_failure; |
1da177e4 LT |
2862 | } else { |
2863 | if (err == -EMSGSIZE) | |
be403ea1 | 2864 | goto nla_put_failure; |
e3703b3d | 2865 | error = err; |
1da177e4 LT |
2866 | } |
2867 | } | |
2868 | } else | |
2869 | #endif | |
be403ea1 | 2870 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2871 | } |
2872 | ||
e3703b3d TG |
2873 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2874 | expires, error) < 0) | |
2875 | goto nla_put_failure; | |
be403ea1 TG |
2876 | |
2877 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2878 | |
be403ea1 | 2879 | nla_put_failure: |
26932566 PM |
2880 | nlmsg_cancel(skb, nlh); |
2881 | return -EMSGSIZE; | |
1da177e4 LT |
2882 | } |
2883 | ||
63f3444f | 2884 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2885 | { |
3b1e0a65 | 2886 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2887 | struct rtmsg *rtm; |
2888 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2889 | struct rtable *rt = NULL; |
9e12bb22 AV |
2890 | __be32 dst = 0; |
2891 | __be32 src = 0; | |
2892 | u32 iif; | |
d889ce3b | 2893 | int err; |
1da177e4 LT |
2894 | struct sk_buff *skb; |
2895 | ||
d889ce3b TG |
2896 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2897 | if (err < 0) | |
2898 | goto errout; | |
2899 | ||
2900 | rtm = nlmsg_data(nlh); | |
2901 | ||
1da177e4 | 2902 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2903 | if (skb == NULL) { |
2904 | err = -ENOBUFS; | |
2905 | goto errout; | |
2906 | } | |
1da177e4 LT |
2907 | |
2908 | /* Reserve room for dummy headers, this skb can pass | |
2909 | through good chunk of routing engine. | |
2910 | */ | |
459a98ed | 2911 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2912 | skb_reset_network_header(skb); |
d2c962b8 SH |
2913 | |
2914 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2915 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2916 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2917 | ||
17fb2c64 AV |
2918 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2919 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2920 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2921 | |
2922 | if (iif) { | |
d889ce3b TG |
2923 | struct net_device *dev; |
2924 | ||
1937504d | 2925 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2926 | if (dev == NULL) { |
2927 | err = -ENODEV; | |
2928 | goto errout_free; | |
2929 | } | |
2930 | ||
1da177e4 LT |
2931 | skb->protocol = htons(ETH_P_IP); |
2932 | skb->dev = dev; | |
2933 | local_bh_disable(); | |
2934 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2935 | local_bh_enable(); | |
d889ce3b | 2936 | |
ee6b9673 | 2937 | rt = skb->rtable; |
d889ce3b | 2938 | if (err == 0 && rt->u.dst.error) |
1da177e4 LT |
2939 | err = -rt->u.dst.error; |
2940 | } else { | |
d889ce3b TG |
2941 | struct flowi fl = { |
2942 | .nl_u = { | |
2943 | .ip4_u = { | |
2944 | .daddr = dst, | |
2945 | .saddr = src, | |
2946 | .tos = rtm->rtm_tos, | |
2947 | }, | |
2948 | }, | |
2949 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2950 | }; | |
1937504d | 2951 | err = ip_route_output_key(net, &rt, &fl); |
1da177e4 | 2952 | } |
d889ce3b | 2953 | |
1da177e4 | 2954 | if (err) |
d889ce3b | 2955 | goto errout_free; |
1da177e4 | 2956 | |
ee6b9673 | 2957 | skb->rtable = rt; |
1da177e4 LT |
2958 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2959 | rt->rt_flags |= RTCF_NOTIFY; | |
2960 | ||
1da177e4 | 2961 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2962 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2963 | if (err <= 0) |
2964 | goto errout_free; | |
1da177e4 | 2965 | |
1937504d | 2966 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2967 | errout: |
2942e900 | 2968 | return err; |
1da177e4 | 2969 | |
d889ce3b | 2970 | errout_free: |
1da177e4 | 2971 | kfree_skb(skb); |
d889ce3b | 2972 | goto errout; |
1da177e4 LT |
2973 | } |
2974 | ||
2975 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2976 | { | |
2977 | struct rtable *rt; | |
2978 | int h, s_h; | |
2979 | int idx, s_idx; | |
1937504d DL |
2980 | struct net *net; |
2981 | ||
3b1e0a65 | 2982 | net = sock_net(skb->sk); |
1da177e4 LT |
2983 | |
2984 | s_h = cb->args[0]; | |
d8c92830 ED |
2985 | if (s_h < 0) |
2986 | s_h = 0; | |
1da177e4 | 2987 | s_idx = idx = cb->args[1]; |
a6272665 ED |
2988 | for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) { |
2989 | if (!rt_hash_table[h].chain) | |
2990 | continue; | |
1da177e4 LT |
2991 | rcu_read_lock_bh(); |
2992 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2993 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
878628fb | 2994 | if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx) |
1da177e4 | 2995 | continue; |
e84f84f2 | 2996 | if (rt_is_expired(rt)) |
29e75252 | 2997 | continue; |
1da177e4 LT |
2998 | skb->dst = dst_clone(&rt->u.dst); |
2999 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 3000 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 3001 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
3002 | dst_release(xchg(&skb->dst, NULL)); |
3003 | rcu_read_unlock_bh(); | |
3004 | goto done; | |
3005 | } | |
3006 | dst_release(xchg(&skb->dst, NULL)); | |
3007 | } | |
3008 | rcu_read_unlock_bh(); | |
3009 | } | |
3010 | ||
3011 | done: | |
3012 | cb->args[0] = h; | |
3013 | cb->args[1] = idx; | |
3014 | return skb->len; | |
3015 | } | |
3016 | ||
3017 | void ip_rt_multicast_event(struct in_device *in_dev) | |
3018 | { | |
76e6ebfb | 3019 | rt_cache_flush(dev_net(in_dev->dev), 0); |
1da177e4 LT |
3020 | } |
3021 | ||
3022 | #ifdef CONFIG_SYSCTL | |
81c684d1 | 3023 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
1da177e4 LT |
3024 | struct file *filp, void __user *buffer, |
3025 | size_t *lenp, loff_t *ppos) | |
3026 | { | |
3027 | if (write) { | |
639e104f | 3028 | int flush_delay; |
81c684d1 | 3029 | ctl_table ctl; |
39a23e75 | 3030 | struct net *net; |
639e104f | 3031 | |
81c684d1 DL |
3032 | memcpy(&ctl, __ctl, sizeof(ctl)); |
3033 | ctl.data = &flush_delay; | |
3034 | proc_dointvec(&ctl, write, filp, buffer, lenp, ppos); | |
639e104f | 3035 | |
81c684d1 | 3036 | net = (struct net *)__ctl->extra1; |
39a23e75 | 3037 | rt_cache_flush(net, flush_delay); |
1da177e4 | 3038 | return 0; |
e905a9ed | 3039 | } |
1da177e4 LT |
3040 | |
3041 | return -EINVAL; | |
3042 | } | |
3043 | ||
3044 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
1da177e4 LT |
3045 | void __user *oldval, |
3046 | size_t __user *oldlenp, | |
3047 | void __user *newval, | |
1f29bcd7 | 3048 | size_t newlen) |
1da177e4 LT |
3049 | { |
3050 | int delay; | |
39a23e75 | 3051 | struct net *net; |
1da177e4 LT |
3052 | if (newlen != sizeof(int)) |
3053 | return -EINVAL; | |
3054 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed | 3055 | return -EFAULT; |
39a23e75 DL |
3056 | net = (struct net *)table->extra1; |
3057 | rt_cache_flush(net, delay); | |
1da177e4 LT |
3058 | return 0; |
3059 | } | |
3060 | ||
c6153b5b HX |
3061 | static void rt_secret_reschedule(int old) |
3062 | { | |
3063 | struct net *net; | |
3064 | int new = ip_rt_secret_interval; | |
3065 | int diff = new - old; | |
3066 | ||
3067 | if (!diff) | |
3068 | return; | |
3069 | ||
3070 | rtnl_lock(); | |
3071 | for_each_net(net) { | |
3072 | int deleted = del_timer_sync(&net->ipv4.rt_secret_timer); | |
3073 | ||
3074 | if (!new) | |
3075 | continue; | |
3076 | ||
3077 | if (deleted) { | |
3078 | long time = net->ipv4.rt_secret_timer.expires - jiffies; | |
3079 | ||
3080 | if (time <= 0 || (time += diff) <= 0) | |
3081 | time = 0; | |
3082 | ||
3083 | net->ipv4.rt_secret_timer.expires = time; | |
3084 | } else | |
3085 | net->ipv4.rt_secret_timer.expires = new; | |
3086 | ||
3087 | net->ipv4.rt_secret_timer.expires += jiffies; | |
3088 | add_timer(&net->ipv4.rt_secret_timer); | |
3089 | } | |
3090 | rtnl_unlock(); | |
3091 | } | |
3092 | ||
3093 | static int ipv4_sysctl_rt_secret_interval(ctl_table *ctl, int write, | |
3094 | struct file *filp, | |
3095 | void __user *buffer, size_t *lenp, | |
3096 | loff_t *ppos) | |
3097 | { | |
3098 | int old = ip_rt_secret_interval; | |
3099 | int ret = proc_dointvec_jiffies(ctl, write, filp, buffer, lenp, ppos); | |
3100 | ||
3101 | rt_secret_reschedule(old); | |
3102 | ||
3103 | return ret; | |
3104 | } | |
3105 | ||
3106 | static int ipv4_sysctl_rt_secret_interval_strategy(ctl_table *table, | |
c6153b5b HX |
3107 | void __user *oldval, |
3108 | size_t __user *oldlenp, | |
3109 | void __user *newval, | |
3110 | size_t newlen) | |
3111 | { | |
3112 | int old = ip_rt_secret_interval; | |
f221e726 | 3113 | int ret = sysctl_jiffies(table, oldval, oldlenp, newval, newlen); |
c6153b5b HX |
3114 | |
3115 | rt_secret_reschedule(old); | |
3116 | ||
3117 | return ret; | |
3118 | } | |
3119 | ||
eeb61f71 | 3120 | static ctl_table ipv4_route_table[] = { |
1da177e4 LT |
3121 | { |
3122 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
3123 | .procname = "gc_thresh", | |
3124 | .data = &ipv4_dst_ops.gc_thresh, | |
3125 | .maxlen = sizeof(int), | |
3126 | .mode = 0644, | |
3127 | .proc_handler = &proc_dointvec, | |
3128 | }, | |
3129 | { | |
3130 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
3131 | .procname = "max_size", | |
3132 | .data = &ip_rt_max_size, | |
3133 | .maxlen = sizeof(int), | |
3134 | .mode = 0644, | |
3135 | .proc_handler = &proc_dointvec, | |
3136 | }, | |
3137 | { | |
3138 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 3139 | |
1da177e4 LT |
3140 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
3141 | .procname = "gc_min_interval", | |
3142 | .data = &ip_rt_gc_min_interval, | |
3143 | .maxlen = sizeof(int), | |
3144 | .mode = 0644, | |
3145 | .proc_handler = &proc_dointvec_jiffies, | |
3146 | .strategy = &sysctl_jiffies, | |
3147 | }, | |
3148 | { | |
3149 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
3150 | .procname = "gc_min_interval_ms", | |
3151 | .data = &ip_rt_gc_min_interval, | |
3152 | .maxlen = sizeof(int), | |
3153 | .mode = 0644, | |
3154 | .proc_handler = &proc_dointvec_ms_jiffies, | |
3155 | .strategy = &sysctl_ms_jiffies, | |
3156 | }, | |
3157 | { | |
3158 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
3159 | .procname = "gc_timeout", | |
3160 | .data = &ip_rt_gc_timeout, | |
3161 | .maxlen = sizeof(int), | |
3162 | .mode = 0644, | |
3163 | .proc_handler = &proc_dointvec_jiffies, | |
3164 | .strategy = &sysctl_jiffies, | |
3165 | }, | |
3166 | { | |
3167 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
3168 | .procname = "gc_interval", | |
3169 | .data = &ip_rt_gc_interval, | |
3170 | .maxlen = sizeof(int), | |
3171 | .mode = 0644, | |
3172 | .proc_handler = &proc_dointvec_jiffies, | |
3173 | .strategy = &sysctl_jiffies, | |
3174 | }, | |
3175 | { | |
3176 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
3177 | .procname = "redirect_load", | |
3178 | .data = &ip_rt_redirect_load, | |
3179 | .maxlen = sizeof(int), | |
3180 | .mode = 0644, | |
3181 | .proc_handler = &proc_dointvec, | |
3182 | }, | |
3183 | { | |
3184 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
3185 | .procname = "redirect_number", | |
3186 | .data = &ip_rt_redirect_number, | |
3187 | .maxlen = sizeof(int), | |
3188 | .mode = 0644, | |
3189 | .proc_handler = &proc_dointvec, | |
3190 | }, | |
3191 | { | |
3192 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
3193 | .procname = "redirect_silence", | |
3194 | .data = &ip_rt_redirect_silence, | |
3195 | .maxlen = sizeof(int), | |
3196 | .mode = 0644, | |
3197 | .proc_handler = &proc_dointvec, | |
3198 | }, | |
3199 | { | |
3200 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
3201 | .procname = "error_cost", | |
3202 | .data = &ip_rt_error_cost, | |
3203 | .maxlen = sizeof(int), | |
3204 | .mode = 0644, | |
3205 | .proc_handler = &proc_dointvec, | |
3206 | }, | |
3207 | { | |
3208 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
3209 | .procname = "error_burst", | |
3210 | .data = &ip_rt_error_burst, | |
3211 | .maxlen = sizeof(int), | |
3212 | .mode = 0644, | |
3213 | .proc_handler = &proc_dointvec, | |
3214 | }, | |
3215 | { | |
3216 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
3217 | .procname = "gc_elasticity", | |
3218 | .data = &ip_rt_gc_elasticity, | |
3219 | .maxlen = sizeof(int), | |
3220 | .mode = 0644, | |
3221 | .proc_handler = &proc_dointvec, | |
3222 | }, | |
3223 | { | |
3224 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
3225 | .procname = "mtu_expires", | |
3226 | .data = &ip_rt_mtu_expires, | |
3227 | .maxlen = sizeof(int), | |
3228 | .mode = 0644, | |
3229 | .proc_handler = &proc_dointvec_jiffies, | |
3230 | .strategy = &sysctl_jiffies, | |
3231 | }, | |
3232 | { | |
3233 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
3234 | .procname = "min_pmtu", | |
3235 | .data = &ip_rt_min_pmtu, | |
3236 | .maxlen = sizeof(int), | |
3237 | .mode = 0644, | |
3238 | .proc_handler = &proc_dointvec, | |
3239 | }, | |
3240 | { | |
3241 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
3242 | .procname = "min_adv_mss", | |
3243 | .data = &ip_rt_min_advmss, | |
3244 | .maxlen = sizeof(int), | |
3245 | .mode = 0644, | |
3246 | .proc_handler = &proc_dointvec, | |
3247 | }, | |
3248 | { | |
3249 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
3250 | .procname = "secret_interval", | |
3251 | .data = &ip_rt_secret_interval, | |
3252 | .maxlen = sizeof(int), | |
3253 | .mode = 0644, | |
c6153b5b HX |
3254 | .proc_handler = &ipv4_sysctl_rt_secret_interval, |
3255 | .strategy = &ipv4_sysctl_rt_secret_interval_strategy, | |
1da177e4 LT |
3256 | }, |
3257 | { .ctl_name = 0 } | |
3258 | }; | |
39a23e75 | 3259 | |
2f4520d3 AV |
3260 | static struct ctl_table empty[1]; |
3261 | ||
3262 | static struct ctl_table ipv4_skeleton[] = | |
3263 | { | |
3264 | { .procname = "route", .ctl_name = NET_IPV4_ROUTE, | |
d994af0d | 3265 | .mode = 0555, .child = ipv4_route_table}, |
2f4520d3 | 3266 | { .procname = "neigh", .ctl_name = NET_IPV4_NEIGH, |
d994af0d | 3267 | .mode = 0555, .child = empty}, |
2f4520d3 AV |
3268 | { } |
3269 | }; | |
3270 | ||
3271 | static __net_initdata struct ctl_path ipv4_path[] = { | |
39a23e75 DL |
3272 | { .procname = "net", .ctl_name = CTL_NET, }, |
3273 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
39a23e75 DL |
3274 | { }, |
3275 | }; | |
3276 | ||
39a23e75 DL |
3277 | static struct ctl_table ipv4_route_flush_table[] = { |
3278 | { | |
3279 | .ctl_name = NET_IPV4_ROUTE_FLUSH, | |
3280 | .procname = "flush", | |
3281 | .maxlen = sizeof(int), | |
3282 | .mode = 0200, | |
3283 | .proc_handler = &ipv4_sysctl_rtcache_flush, | |
3284 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
3285 | }, | |
3286 | { .ctl_name = 0 }, | |
3287 | }; | |
3288 | ||
2f4520d3 AV |
3289 | static __net_initdata struct ctl_path ipv4_route_path[] = { |
3290 | { .procname = "net", .ctl_name = CTL_NET, }, | |
3291 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
3292 | { .procname = "route", .ctl_name = NET_IPV4_ROUTE, }, | |
3293 | { }, | |
3294 | }; | |
3295 | ||
39a23e75 DL |
3296 | static __net_init int sysctl_route_net_init(struct net *net) |
3297 | { | |
3298 | struct ctl_table *tbl; | |
3299 | ||
3300 | tbl = ipv4_route_flush_table; | |
3301 | if (net != &init_net) { | |
3302 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); | |
3303 | if (tbl == NULL) | |
3304 | goto err_dup; | |
3305 | } | |
3306 | tbl[0].extra1 = net; | |
3307 | ||
3308 | net->ipv4.route_hdr = | |
3309 | register_net_sysctl_table(net, ipv4_route_path, tbl); | |
3310 | if (net->ipv4.route_hdr == NULL) | |
3311 | goto err_reg; | |
3312 | return 0; | |
3313 | ||
3314 | err_reg: | |
3315 | if (tbl != ipv4_route_flush_table) | |
3316 | kfree(tbl); | |
3317 | err_dup: | |
3318 | return -ENOMEM; | |
3319 | } | |
3320 | ||
3321 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3322 | { | |
3323 | struct ctl_table *tbl; | |
3324 | ||
3325 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3326 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3327 | BUG_ON(tbl == ipv4_route_flush_table); | |
3328 | kfree(tbl); | |
3329 | } | |
3330 | ||
3331 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3332 | .init = sysctl_route_net_init, | |
3333 | .exit = sysctl_route_net_exit, | |
3334 | }; | |
1da177e4 LT |
3335 | #endif |
3336 | ||
9f5e97e5 DL |
3337 | |
3338 | static __net_init int rt_secret_timer_init(struct net *net) | |
3339 | { | |
e84f84f2 DL |
3340 | atomic_set(&net->ipv4.rt_genid, |
3341 | (int) ((num_physpages ^ (num_physpages>>8)) ^ | |
3342 | (jiffies ^ (jiffies >> 7)))); | |
3343 | ||
9f5e97e5 DL |
3344 | net->ipv4.rt_secret_timer.function = rt_secret_rebuild; |
3345 | net->ipv4.rt_secret_timer.data = (unsigned long)net; | |
3346 | init_timer_deferrable(&net->ipv4.rt_secret_timer); | |
3347 | ||
c6153b5b HX |
3348 | if (ip_rt_secret_interval) { |
3349 | net->ipv4.rt_secret_timer.expires = | |
3350 | jiffies + net_random() % ip_rt_secret_interval + | |
3351 | ip_rt_secret_interval; | |
3352 | add_timer(&net->ipv4.rt_secret_timer); | |
3353 | } | |
9f5e97e5 DL |
3354 | return 0; |
3355 | } | |
3356 | ||
3357 | static __net_exit void rt_secret_timer_exit(struct net *net) | |
3358 | { | |
3359 | del_timer_sync(&net->ipv4.rt_secret_timer); | |
3360 | } | |
3361 | ||
3362 | static __net_initdata struct pernet_operations rt_secret_timer_ops = { | |
3363 | .init = rt_secret_timer_init, | |
3364 | .exit = rt_secret_timer_exit, | |
3365 | }; | |
3366 | ||
3367 | ||
1da177e4 | 3368 | #ifdef CONFIG_NET_CLS_ROUTE |
8dbde28d | 3369 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
1da177e4 LT |
3370 | #endif /* CONFIG_NET_CLS_ROUTE */ |
3371 | ||
3372 | static __initdata unsigned long rhash_entries; | |
3373 | static int __init set_rhash_entries(char *str) | |
3374 | { | |
3375 | if (!str) | |
3376 | return 0; | |
3377 | rhash_entries = simple_strtoul(str, &str, 0); | |
3378 | return 1; | |
3379 | } | |
3380 | __setup("rhash_entries=", set_rhash_entries); | |
3381 | ||
3382 | int __init ip_rt_init(void) | |
3383 | { | |
424c4b70 | 3384 | int rc = 0; |
1da177e4 | 3385 | |
1da177e4 | 3386 | #ifdef CONFIG_NET_CLS_ROUTE |
8dbde28d | 3387 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
1da177e4 LT |
3388 | if (!ip_rt_acct) |
3389 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3390 | #endif |
3391 | ||
e5d679f3 AD |
3392 | ipv4_dst_ops.kmem_cachep = |
3393 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3394 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3395 | |
14e50e57 DM |
3396 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3397 | ||
424c4b70 ED |
3398 | rt_hash_table = (struct rt_hash_bucket *) |
3399 | alloc_large_system_hash("IP route cache", | |
3400 | sizeof(struct rt_hash_bucket), | |
3401 | rhash_entries, | |
3402 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3403 | 15 : 17, |
8d1502de | 3404 | 0, |
424c4b70 ED |
3405 | &rt_hash_log, |
3406 | &rt_hash_mask, | |
3407 | 0); | |
22c047cc ED |
3408 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3409 | rt_hash_lock_init(); | |
1da177e4 LT |
3410 | |
3411 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3412 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3413 | ||
1da177e4 LT |
3414 | devinet_init(); |
3415 | ip_fib_init(); | |
3416 | ||
1da177e4 LT |
3417 | /* All the timers, started at system startup tend |
3418 | to synchronize. Perturb it a bit. | |
3419 | */ | |
39c90ece ED |
3420 | schedule_delayed_work(&expires_work, |
3421 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
1da177e4 | 3422 | |
9f5e97e5 DL |
3423 | if (register_pernet_subsys(&rt_secret_timer_ops)) |
3424 | printk(KERN_ERR "Unable to setup rt_secret_timer\n"); | |
1da177e4 | 3425 | |
73b38711 | 3426 | if (ip_rt_proc_init()) |
107f1634 | 3427 | printk(KERN_ERR "Unable to create route proc files\n"); |
1da177e4 LT |
3428 | #ifdef CONFIG_XFRM |
3429 | xfrm_init(); | |
3430 | xfrm4_init(); | |
3431 | #endif | |
63f3444f TG |
3432 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3433 | ||
39a23e75 DL |
3434 | #ifdef CONFIG_SYSCTL |
3435 | register_pernet_subsys(&sysctl_route_ops); | |
3436 | #endif | |
1da177e4 LT |
3437 | return rc; |
3438 | } | |
3439 | ||
a1bc6eb4 | 3440 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3441 | /* |
3442 | * We really need to sanitize the damn ipv4 init order, then all | |
3443 | * this nonsense will go away. | |
3444 | */ | |
3445 | void __init ip_static_sysctl_init(void) | |
3446 | { | |
2f4520d3 | 3447 | register_sysctl_paths(ipv4_path, ipv4_skeleton); |
eeb61f71 | 3448 | } |
a1bc6eb4 | 3449 | #endif |
eeb61f71 | 3450 | |
1da177e4 LT |
3451 | EXPORT_SYMBOL(__ip_select_ident); |
3452 | EXPORT_SYMBOL(ip_route_input); | |
3453 | EXPORT_SYMBOL(ip_route_output_key); |