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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; | |
1da177e4 | 132 | |
beb659bd ED |
133 | static void rt_worker_func(struct work_struct *work); |
134 | static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); | |
1da177e4 LT |
135 | |
136 | /* | |
137 | * Interface to generic destination cache. | |
138 | */ | |
139 | ||
140 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
141 | static void ipv4_dst_destroy(struct dst_entry *dst); | |
142 | static void ipv4_dst_ifdown(struct dst_entry *dst, | |
143 | struct net_device *dev, int how); | |
144 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); | |
145 | static void ipv4_link_failure(struct sk_buff *skb); | |
146 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
569d3645 | 147 | static int rt_garbage_collect(struct dst_ops *ops); |
1da177e4 LT |
148 | |
149 | ||
150 | static struct dst_ops ipv4_dst_ops = { | |
151 | .family = AF_INET, | |
152 | .protocol = __constant_htons(ETH_P_IP), | |
153 | .gc = rt_garbage_collect, | |
154 | .check = ipv4_dst_check, | |
155 | .destroy = ipv4_dst_destroy, | |
156 | .ifdown = ipv4_dst_ifdown, | |
157 | .negative_advice = ipv4_negative_advice, | |
158 | .link_failure = ipv4_link_failure, | |
159 | .update_pmtu = ip_rt_update_pmtu, | |
1ac06e03 | 160 | .local_out = __ip_local_out, |
1da177e4 | 161 | .entry_size = sizeof(struct rtable), |
e2422970 | 162 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
163 | }; |
164 | ||
165 | #define ECN_OR_COST(class) TC_PRIO_##class | |
166 | ||
4839c52b | 167 | const __u8 ip_tos2prio[16] = { |
1da177e4 LT |
168 | TC_PRIO_BESTEFFORT, |
169 | ECN_OR_COST(FILLER), | |
170 | TC_PRIO_BESTEFFORT, | |
171 | ECN_OR_COST(BESTEFFORT), | |
172 | TC_PRIO_BULK, | |
173 | ECN_OR_COST(BULK), | |
174 | TC_PRIO_BULK, | |
175 | ECN_OR_COST(BULK), | |
176 | TC_PRIO_INTERACTIVE, | |
177 | ECN_OR_COST(INTERACTIVE), | |
178 | TC_PRIO_INTERACTIVE, | |
179 | ECN_OR_COST(INTERACTIVE), | |
180 | TC_PRIO_INTERACTIVE_BULK, | |
181 | ECN_OR_COST(INTERACTIVE_BULK), | |
182 | TC_PRIO_INTERACTIVE_BULK, | |
183 | ECN_OR_COST(INTERACTIVE_BULK) | |
184 | }; | |
185 | ||
186 | ||
187 | /* | |
188 | * Route cache. | |
189 | */ | |
190 | ||
191 | /* The locking scheme is rather straight forward: | |
192 | * | |
193 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
194 | * 2) Only writers remove entries, and they hold the lock | |
195 | * as they look at rtable reference counts. | |
196 | * 3) Only readers acquire references to rtable entries, | |
197 | * they do so with atomic increments and with the | |
198 | * lock held. | |
199 | */ | |
200 | ||
201 | struct rt_hash_bucket { | |
202 | struct rtable *chain; | |
22c047cc | 203 | }; |
8a25d5de IM |
204 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
205 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
206 | /* |
207 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
208 | * The size of this table is a power of two and depends on the number of CPUS. | |
62051200 | 209 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 210 | */ |
62051200 IM |
211 | #ifdef CONFIG_LOCKDEP |
212 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 213 | #else |
62051200 IM |
214 | # if NR_CPUS >= 32 |
215 | # define RT_HASH_LOCK_SZ 4096 | |
216 | # elif NR_CPUS >= 16 | |
217 | # define RT_HASH_LOCK_SZ 2048 | |
218 | # elif NR_CPUS >= 8 | |
219 | # define RT_HASH_LOCK_SZ 1024 | |
220 | # elif NR_CPUS >= 4 | |
221 | # define RT_HASH_LOCK_SZ 512 | |
222 | # else | |
223 | # define RT_HASH_LOCK_SZ 256 | |
224 | # endif | |
22c047cc ED |
225 | #endif |
226 | ||
227 | static spinlock_t *rt_hash_locks; | |
228 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
1ff1cc20 PE |
229 | |
230 | static __init void rt_hash_lock_init(void) | |
231 | { | |
232 | int i; | |
233 | ||
234 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, | |
235 | GFP_KERNEL); | |
236 | if (!rt_hash_locks) | |
237 | panic("IP: failed to allocate rt_hash_locks\n"); | |
238 | ||
239 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) | |
240 | spin_lock_init(&rt_hash_locks[i]); | |
241 | } | |
22c047cc ED |
242 | #else |
243 | # define rt_hash_lock_addr(slot) NULL | |
1ff1cc20 PE |
244 | |
245 | static inline void rt_hash_lock_init(void) | |
246 | { | |
247 | } | |
22c047cc | 248 | #endif |
1da177e4 | 249 | |
817bc4db SH |
250 | static struct rt_hash_bucket *rt_hash_table __read_mostly; |
251 | static unsigned rt_hash_mask __read_mostly; | |
252 | static unsigned int rt_hash_log __read_mostly; | |
1da177e4 | 253 | |
2f970d83 | 254 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
dbd2915c | 255 | #define RT_CACHE_STAT_INC(field) \ |
bfe5d834 | 256 | (__raw_get_cpu_var(rt_cache_stat).field++) |
1da177e4 | 257 | |
b00180de DL |
258 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, |
259 | int genid) | |
1da177e4 | 260 | { |
1294fc4a SH |
261 | return jhash_3words((__force u32)(__be32)(daddr), |
262 | (__force u32)(__be32)(saddr), | |
b00180de | 263 | idx, genid) |
29e75252 | 264 | & rt_hash_mask; |
1da177e4 LT |
265 | } |
266 | ||
e84f84f2 DL |
267 | static inline int rt_genid(struct net *net) |
268 | { | |
269 | return atomic_read(&net->ipv4.rt_genid); | |
270 | } | |
271 | ||
1da177e4 LT |
272 | #ifdef CONFIG_PROC_FS |
273 | struct rt_cache_iter_state { | |
a75e936f | 274 | struct seq_net_private p; |
1da177e4 | 275 | int bucket; |
29e75252 | 276 | int genid; |
1da177e4 LT |
277 | }; |
278 | ||
1218854a | 279 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
1da177e4 | 280 | { |
1218854a | 281 | struct rt_cache_iter_state *st = seq->private; |
1da177e4 | 282 | struct rtable *r = NULL; |
1da177e4 LT |
283 | |
284 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
285 | rcu_read_lock_bh(); | |
29e75252 ED |
286 | r = rcu_dereference(rt_hash_table[st->bucket].chain); |
287 | while (r) { | |
1218854a | 288 | if (dev_net(r->u.dst.dev) == seq_file_net(seq) && |
a75e936f | 289 | r->rt_genid == st->genid) |
29e75252 ED |
290 | return r; |
291 | r = rcu_dereference(r->u.dst.rt_next); | |
292 | } | |
1da177e4 LT |
293 | rcu_read_unlock_bh(); |
294 | } | |
29e75252 | 295 | return r; |
1da177e4 LT |
296 | } |
297 | ||
1218854a | 298 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
642d6318 | 299 | struct rtable *r) |
1da177e4 | 300 | { |
1218854a | 301 | struct rt_cache_iter_state *st = seq->private; |
093c2ca4 | 302 | r = r->u.dst.rt_next; |
1da177e4 LT |
303 | while (!r) { |
304 | rcu_read_unlock_bh(); | |
305 | if (--st->bucket < 0) | |
306 | break; | |
307 | rcu_read_lock_bh(); | |
308 | r = rt_hash_table[st->bucket].chain; | |
309 | } | |
0bcceadc | 310 | return rcu_dereference(r); |
1da177e4 LT |
311 | } |
312 | ||
1218854a | 313 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
642d6318 DL |
314 | struct rtable *r) |
315 | { | |
1218854a YH |
316 | struct rt_cache_iter_state *st = seq->private; |
317 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { | |
318 | if (dev_net(r->u.dst.dev) != seq_file_net(seq)) | |
a75e936f | 319 | continue; |
642d6318 DL |
320 | if (r->rt_genid == st->genid) |
321 | break; | |
322 | } | |
323 | return r; | |
324 | } | |
325 | ||
1218854a | 326 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 327 | { |
1218854a | 328 | struct rtable *r = rt_cache_get_first(seq); |
1da177e4 LT |
329 | |
330 | if (r) | |
1218854a | 331 | while (pos && (r = rt_cache_get_next(seq, r))) |
1da177e4 LT |
332 | --pos; |
333 | return pos ? NULL : r; | |
334 | } | |
335 | ||
336 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
337 | { | |
29e75252 | 338 | struct rt_cache_iter_state *st = seq->private; |
29e75252 | 339 | if (*pos) |
1218854a | 340 | return rt_cache_get_idx(seq, *pos - 1); |
e84f84f2 | 341 | st->genid = rt_genid(seq_file_net(seq)); |
29e75252 | 342 | return SEQ_START_TOKEN; |
1da177e4 LT |
343 | } |
344 | ||
345 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
346 | { | |
29e75252 | 347 | struct rtable *r; |
1da177e4 LT |
348 | |
349 | if (v == SEQ_START_TOKEN) | |
1218854a | 350 | r = rt_cache_get_first(seq); |
1da177e4 | 351 | else |
1218854a | 352 | r = rt_cache_get_next(seq, v); |
1da177e4 LT |
353 | ++*pos; |
354 | return r; | |
355 | } | |
356 | ||
357 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
358 | { | |
359 | if (v && v != SEQ_START_TOKEN) | |
360 | rcu_read_unlock_bh(); | |
361 | } | |
362 | ||
363 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
364 | { | |
365 | if (v == SEQ_START_TOKEN) | |
366 | seq_printf(seq, "%-127s\n", | |
367 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
368 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
369 | "HHUptod\tSpecDst"); | |
370 | else { | |
371 | struct rtable *r = v; | |
5e659e4c | 372 | int len; |
1da177e4 | 373 | |
5e659e4c PE |
374 | seq_printf(seq, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" |
375 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", | |
1da177e4 LT |
376 | r->u.dst.dev ? r->u.dst.dev->name : "*", |
377 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, | |
378 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), | |
379 | r->u.dst.__use, 0, (unsigned long)r->rt_src, | |
380 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? | |
381 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), | |
382 | dst_metric(&r->u.dst, RTAX_WINDOW), | |
383 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + | |
384 | dst_metric(&r->u.dst, RTAX_RTTVAR)), | |
385 | r->fl.fl4_tos, | |
386 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, | |
387 | r->u.dst.hh ? (r->u.dst.hh->hh_output == | |
388 | dev_queue_xmit) : 0, | |
5e659e4c PE |
389 | r->rt_spec_dst, &len); |
390 | ||
391 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
e905a9ed YH |
392 | } |
393 | return 0; | |
1da177e4 LT |
394 | } |
395 | ||
f690808e | 396 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
397 | .start = rt_cache_seq_start, |
398 | .next = rt_cache_seq_next, | |
399 | .stop = rt_cache_seq_stop, | |
400 | .show = rt_cache_seq_show, | |
401 | }; | |
402 | ||
403 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
404 | { | |
a75e936f | 405 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 406 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
407 | } |
408 | ||
9a32144e | 409 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
410 | .owner = THIS_MODULE, |
411 | .open = rt_cache_seq_open, | |
412 | .read = seq_read, | |
413 | .llseek = seq_lseek, | |
a75e936f | 414 | .release = seq_release_net, |
1da177e4 LT |
415 | }; |
416 | ||
417 | ||
418 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
419 | { | |
420 | int cpu; | |
421 | ||
422 | if (*pos == 0) | |
423 | return SEQ_START_TOKEN; | |
424 | ||
425 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { | |
426 | if (!cpu_possible(cpu)) | |
427 | continue; | |
428 | *pos = cpu+1; | |
2f970d83 | 429 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
430 | } |
431 | return NULL; | |
432 | } | |
433 | ||
434 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
435 | { | |
436 | int cpu; | |
437 | ||
438 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
439 | if (!cpu_possible(cpu)) | |
440 | continue; | |
441 | *pos = cpu+1; | |
2f970d83 | 442 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
443 | } |
444 | return NULL; | |
e905a9ed | 445 | |
1da177e4 LT |
446 | } |
447 | ||
448 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
449 | { | |
450 | ||
451 | } | |
452 | ||
453 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
454 | { | |
455 | struct rt_cache_stat *st = v; | |
456 | ||
457 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 458 | seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
1da177e4 LT |
459 | return 0; |
460 | } | |
e905a9ed | 461 | |
1da177e4 LT |
462 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
463 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
464 | atomic_read(&ipv4_dst_ops.entries), | |
465 | st->in_hit, | |
466 | st->in_slow_tot, | |
467 | st->in_slow_mc, | |
468 | st->in_no_route, | |
469 | st->in_brd, | |
470 | st->in_martian_dst, | |
471 | st->in_martian_src, | |
472 | ||
473 | st->out_hit, | |
474 | st->out_slow_tot, | |
e905a9ed | 475 | st->out_slow_mc, |
1da177e4 LT |
476 | |
477 | st->gc_total, | |
478 | st->gc_ignored, | |
479 | st->gc_goal_miss, | |
480 | st->gc_dst_overflow, | |
481 | st->in_hlist_search, | |
482 | st->out_hlist_search | |
483 | ); | |
484 | return 0; | |
485 | } | |
486 | ||
f690808e | 487 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
488 | .start = rt_cpu_seq_start, |
489 | .next = rt_cpu_seq_next, | |
490 | .stop = rt_cpu_seq_stop, | |
491 | .show = rt_cpu_seq_show, | |
492 | }; | |
493 | ||
494 | ||
495 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
496 | { | |
497 | return seq_open(file, &rt_cpu_seq_ops); | |
498 | } | |
499 | ||
9a32144e | 500 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
501 | .owner = THIS_MODULE, |
502 | .open = rt_cpu_seq_open, | |
503 | .read = seq_read, | |
504 | .llseek = seq_lseek, | |
505 | .release = seq_release, | |
506 | }; | |
507 | ||
78c686e9 PE |
508 | #ifdef CONFIG_NET_CLS_ROUTE |
509 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, | |
510 | int length, int *eof, void *data) | |
511 | { | |
512 | unsigned int i; | |
513 | ||
514 | if ((offset & 3) || (length & 3)) | |
515 | return -EIO; | |
516 | ||
517 | if (offset >= sizeof(struct ip_rt_acct) * 256) { | |
518 | *eof = 1; | |
519 | return 0; | |
520 | } | |
521 | ||
522 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { | |
523 | length = sizeof(struct ip_rt_acct) * 256 - offset; | |
524 | *eof = 1; | |
525 | } | |
526 | ||
527 | offset /= sizeof(u32); | |
528 | ||
529 | if (length > 0) { | |
530 | u32 *dst = (u32 *) buffer; | |
531 | ||
532 | *start = buffer; | |
533 | memset(dst, 0, length); | |
534 | ||
535 | for_each_possible_cpu(i) { | |
536 | unsigned int j; | |
537 | u32 *src; | |
538 | ||
539 | src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset; | |
540 | for (j = 0; j < length/4; j++) | |
541 | dst[j] += src[j]; | |
542 | } | |
543 | } | |
544 | return length; | |
545 | } | |
546 | #endif | |
107f1634 | 547 | |
73b38711 | 548 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
549 | { |
550 | struct proc_dir_entry *pde; | |
551 | ||
552 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
553 | &rt_cache_seq_fops); | |
554 | if (!pde) | |
555 | goto err1; | |
556 | ||
77020720 WC |
557 | pde = proc_create("rt_cache", S_IRUGO, |
558 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
559 | if (!pde) |
560 | goto err2; | |
561 | ||
107f1634 PE |
562 | #ifdef CONFIG_NET_CLS_ROUTE |
563 | pde = create_proc_read_entry("rt_acct", 0, net->proc_net, | |
564 | ip_rt_acct_read, NULL); | |
565 | if (!pde) | |
566 | goto err3; | |
567 | #endif | |
568 | return 0; | |
569 | ||
570 | #ifdef CONFIG_NET_CLS_ROUTE | |
571 | err3: | |
572 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
573 | #endif | |
574 | err2: | |
575 | remove_proc_entry("rt_cache", net->proc_net); | |
576 | err1: | |
577 | return -ENOMEM; | |
578 | } | |
73b38711 DL |
579 | |
580 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
581 | { | |
582 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
583 | remove_proc_entry("rt_cache", net->proc_net); | |
584 | remove_proc_entry("rt_acct", net->proc_net); | |
585 | } | |
586 | ||
587 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
588 | .init = ip_rt_do_proc_init, | |
589 | .exit = ip_rt_do_proc_exit, | |
590 | }; | |
591 | ||
592 | static int __init ip_rt_proc_init(void) | |
593 | { | |
594 | return register_pernet_subsys(&ip_rt_proc_ops); | |
595 | } | |
596 | ||
107f1634 | 597 | #else |
73b38711 | 598 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
599 | { |
600 | return 0; | |
601 | } | |
1da177e4 | 602 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 603 | |
5969f71d | 604 | static inline void rt_free(struct rtable *rt) |
1da177e4 | 605 | { |
1da177e4 LT |
606 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
607 | } | |
608 | ||
5969f71d | 609 | static inline void rt_drop(struct rtable *rt) |
1da177e4 | 610 | { |
1da177e4 LT |
611 | ip_rt_put(rt); |
612 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
613 | } | |
614 | ||
5969f71d | 615 | static inline int rt_fast_clean(struct rtable *rth) |
1da177e4 LT |
616 | { |
617 | /* Kill broadcast/multicast entries very aggresively, if they | |
618 | collide in hash table with more useful entries */ | |
619 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
093c2ca4 | 620 | rth->fl.iif && rth->u.dst.rt_next; |
1da177e4 LT |
621 | } |
622 | ||
5969f71d | 623 | static inline int rt_valuable(struct rtable *rth) |
1da177e4 LT |
624 | { |
625 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
626 | rth->u.dst.expires; | |
627 | } | |
628 | ||
629 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
630 | { | |
631 | unsigned long age; | |
632 | int ret = 0; | |
633 | ||
634 | if (atomic_read(&rth->u.dst.__refcnt)) | |
635 | goto out; | |
636 | ||
637 | ret = 1; | |
638 | if (rth->u.dst.expires && | |
639 | time_after_eq(jiffies, rth->u.dst.expires)) | |
640 | goto out; | |
641 | ||
642 | age = jiffies - rth->u.dst.lastuse; | |
643 | ret = 0; | |
644 | if ((age <= tmo1 && !rt_fast_clean(rth)) || | |
645 | (age <= tmo2 && rt_valuable(rth))) | |
646 | goto out; | |
647 | ret = 1; | |
648 | out: return ret; | |
649 | } | |
650 | ||
651 | /* Bits of score are: | |
652 | * 31: very valuable | |
653 | * 30: not quite useless | |
654 | * 29..0: usage counter | |
655 | */ | |
656 | static inline u32 rt_score(struct rtable *rt) | |
657 | { | |
658 | u32 score = jiffies - rt->u.dst.lastuse; | |
659 | ||
660 | score = ~score & ~(3<<30); | |
661 | ||
662 | if (rt_valuable(rt)) | |
663 | score |= (1<<31); | |
664 | ||
665 | if (!rt->fl.iif || | |
666 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) | |
667 | score |= (1<<30); | |
668 | ||
669 | return score; | |
670 | } | |
671 | ||
672 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
673 | { | |
714e85be AV |
674 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
675 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | | |
47dcf0cb | 676 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
677 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
678 | *(u16 *)&fl2->nl_u.ip4_u.tos) | | |
679 | (fl1->oif ^ fl2->oif) | | |
680 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
681 | } |
682 | ||
b5921910 DL |
683 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
684 | { | |
c346dca1 | 685 | return dev_net(rt1->u.dst.dev) == dev_net(rt2->u.dst.dev); |
b5921910 DL |
686 | } |
687 | ||
e84f84f2 DL |
688 | static inline int rt_is_expired(struct rtable *rth) |
689 | { | |
690 | return rth->rt_genid != rt_genid(dev_net(rth->u.dst.dev)); | |
691 | } | |
692 | ||
beb659bd ED |
693 | /* |
694 | * Perform a full scan of hash table and free all entries. | |
695 | * Can be called by a softirq or a process. | |
696 | * In the later case, we want to be reschedule if necessary | |
697 | */ | |
698 | static void rt_do_flush(int process_context) | |
699 | { | |
700 | unsigned int i; | |
701 | struct rtable *rth, *next; | |
32cb5b4e | 702 | struct rtable * tail; |
beb659bd ED |
703 | |
704 | for (i = 0; i <= rt_hash_mask; i++) { | |
705 | if (process_context && need_resched()) | |
706 | cond_resched(); | |
707 | rth = rt_hash_table[i].chain; | |
708 | if (!rth) | |
709 | continue; | |
710 | ||
711 | spin_lock_bh(rt_hash_lock_addr(i)); | |
32cb5b4e DL |
712 | #ifdef CONFIG_NET_NS |
713 | { | |
714 | struct rtable ** prev, * p; | |
715 | ||
716 | rth = rt_hash_table[i].chain; | |
717 | ||
718 | /* defer releasing the head of the list after spin_unlock */ | |
719 | for (tail = rth; tail; tail = tail->u.dst.rt_next) | |
720 | if (!rt_is_expired(tail)) | |
721 | break; | |
722 | if (rth != tail) | |
723 | rt_hash_table[i].chain = tail; | |
724 | ||
725 | /* call rt_free on entries after the tail requiring flush */ | |
726 | prev = &rt_hash_table[i].chain; | |
727 | for (p = *prev; p; p = next) { | |
728 | next = p->u.dst.rt_next; | |
729 | if (!rt_is_expired(p)) { | |
730 | prev = &p->u.dst.rt_next; | |
731 | } else { | |
732 | *prev = next; | |
733 | rt_free(p); | |
734 | } | |
735 | } | |
736 | } | |
737 | #else | |
beb659bd ED |
738 | rth = rt_hash_table[i].chain; |
739 | rt_hash_table[i].chain = NULL; | |
32cb5b4e DL |
740 | tail = NULL; |
741 | #endif | |
beb659bd ED |
742 | spin_unlock_bh(rt_hash_lock_addr(i)); |
743 | ||
32cb5b4e | 744 | for (; rth != tail; rth = next) { |
beb659bd ED |
745 | next = rth->u.dst.rt_next; |
746 | rt_free(rth); | |
747 | } | |
748 | } | |
749 | } | |
750 | ||
751 | static void rt_check_expire(void) | |
1da177e4 | 752 | { |
bb1d23b0 ED |
753 | static unsigned int rover; |
754 | unsigned int i = rover, goal; | |
1da177e4 | 755 | struct rtable *rth, **rthp; |
bb1d23b0 ED |
756 | u64 mult; |
757 | ||
758 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; | |
759 | if (ip_rt_gc_timeout > 1) | |
760 | do_div(mult, ip_rt_gc_timeout); | |
761 | goal = (unsigned int)mult; | |
39c90ece ED |
762 | if (goal > rt_hash_mask) |
763 | goal = rt_hash_mask + 1; | |
bb1d23b0 | 764 | for (; goal > 0; goal--) { |
1da177e4 LT |
765 | unsigned long tmo = ip_rt_gc_timeout; |
766 | ||
767 | i = (i + 1) & rt_hash_mask; | |
768 | rthp = &rt_hash_table[i].chain; | |
769 | ||
d90bf5a9 ED |
770 | if (need_resched()) |
771 | cond_resched(); | |
772 | ||
cfcabdcc | 773 | if (*rthp == NULL) |
bb1d23b0 | 774 | continue; |
39c90ece | 775 | spin_lock_bh(rt_hash_lock_addr(i)); |
1da177e4 | 776 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 777 | if (rt_is_expired(rth)) { |
29e75252 ED |
778 | *rthp = rth->u.dst.rt_next; |
779 | rt_free(rth); | |
780 | continue; | |
781 | } | |
1da177e4 LT |
782 | if (rth->u.dst.expires) { |
783 | /* Entry is expired even if it is in use */ | |
39c90ece | 784 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
1da177e4 | 785 | tmo >>= 1; |
093c2ca4 | 786 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
787 | continue; |
788 | } | |
789 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { | |
790 | tmo >>= 1; | |
093c2ca4 | 791 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
792 | continue; |
793 | } | |
794 | ||
795 | /* Cleanup aged off entries. */ | |
093c2ca4 | 796 | *rthp = rth->u.dst.rt_next; |
e905a9ed | 797 | rt_free(rth); |
1da177e4 | 798 | } |
39c90ece | 799 | spin_unlock_bh(rt_hash_lock_addr(i)); |
1da177e4 LT |
800 | } |
801 | rover = i; | |
beb659bd ED |
802 | } |
803 | ||
804 | /* | |
805 | * rt_worker_func() is run in process context. | |
29e75252 | 806 | * we call rt_check_expire() to scan part of the hash table |
beb659bd ED |
807 | */ |
808 | static void rt_worker_func(struct work_struct *work) | |
809 | { | |
29e75252 | 810 | rt_check_expire(); |
39c90ece | 811 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
1da177e4 LT |
812 | } |
813 | ||
29e75252 ED |
814 | /* |
815 | * Pertubation of rt_genid by a small quantity [1..256] | |
816 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() | |
817 | * many times (2^24) without giving recent rt_genid. | |
818 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 819 | */ |
86c657f6 | 820 | static void rt_cache_invalidate(struct net *net) |
1da177e4 | 821 | { |
29e75252 | 822 | unsigned char shuffle; |
1da177e4 | 823 | |
29e75252 | 824 | get_random_bytes(&shuffle, sizeof(shuffle)); |
e84f84f2 | 825 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
1da177e4 LT |
826 | } |
827 | ||
29e75252 ED |
828 | /* |
829 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
830 | * delay >= 0 : invalidate & flush cache (can be long) | |
831 | */ | |
76e6ebfb | 832 | void rt_cache_flush(struct net *net, int delay) |
1da177e4 | 833 | { |
86c657f6 | 834 | rt_cache_invalidate(net); |
29e75252 ED |
835 | if (delay >= 0) |
836 | rt_do_flush(!in_softirq()); | |
1da177e4 LT |
837 | } |
838 | ||
beb659bd | 839 | /* |
29e75252 | 840 | * We change rt_genid and let gc do the cleanup |
beb659bd | 841 | */ |
9f5e97e5 | 842 | static void rt_secret_rebuild(unsigned long __net) |
1da177e4 | 843 | { |
9f5e97e5 | 844 | struct net *net = (struct net *)__net; |
86c657f6 | 845 | rt_cache_invalidate(net); |
9f5e97e5 | 846 | mod_timer(&net->ipv4.rt_secret_timer, jiffies + ip_rt_secret_interval); |
1da177e4 LT |
847 | } |
848 | ||
849 | /* | |
850 | Short description of GC goals. | |
851 | ||
852 | We want to build algorithm, which will keep routing cache | |
853 | at some equilibrium point, when number of aged off entries | |
854 | is kept approximately equal to newly generated ones. | |
855 | ||
856 | Current expiration strength is variable "expire". | |
857 | We try to adjust it dynamically, so that if networking | |
858 | is idle expires is large enough to keep enough of warm entries, | |
859 | and when load increases it reduces to limit cache size. | |
860 | */ | |
861 | ||
569d3645 | 862 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
863 | { |
864 | static unsigned long expire = RT_GC_TIMEOUT; | |
865 | static unsigned long last_gc; | |
866 | static int rover; | |
867 | static int equilibrium; | |
868 | struct rtable *rth, **rthp; | |
869 | unsigned long now = jiffies; | |
870 | int goal; | |
871 | ||
872 | /* | |
873 | * Garbage collection is pretty expensive, | |
874 | * do not make it too frequently. | |
875 | */ | |
876 | ||
877 | RT_CACHE_STAT_INC(gc_total); | |
878 | ||
879 | if (now - last_gc < ip_rt_gc_min_interval && | |
880 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { | |
881 | RT_CACHE_STAT_INC(gc_ignored); | |
882 | goto out; | |
883 | } | |
884 | ||
885 | /* Calculate number of entries, which we want to expire now. */ | |
886 | goal = atomic_read(&ipv4_dst_ops.entries) - | |
887 | (ip_rt_gc_elasticity << rt_hash_log); | |
888 | if (goal <= 0) { | |
889 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
890 | equilibrium = ipv4_dst_ops.gc_thresh; | |
891 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; | |
892 | if (goal > 0) { | |
b790cedd | 893 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
894 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
895 | } | |
896 | } else { | |
897 | /* We are in dangerous area. Try to reduce cache really | |
898 | * aggressively. | |
899 | */ | |
b790cedd | 900 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
1da177e4 LT |
901 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
902 | } | |
903 | ||
904 | if (now - last_gc >= ip_rt_gc_min_interval) | |
905 | last_gc = now; | |
906 | ||
907 | if (goal <= 0) { | |
908 | equilibrium += goal; | |
909 | goto work_done; | |
910 | } | |
911 | ||
912 | do { | |
913 | int i, k; | |
914 | ||
915 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
916 | unsigned long tmo = expire; | |
917 | ||
918 | k = (k + 1) & rt_hash_mask; | |
919 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 920 | spin_lock_bh(rt_hash_lock_addr(k)); |
1da177e4 | 921 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 922 | if (!rt_is_expired(rth) && |
29e75252 | 923 | !rt_may_expire(rth, tmo, expire)) { |
1da177e4 | 924 | tmo >>= 1; |
093c2ca4 | 925 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
926 | continue; |
927 | } | |
093c2ca4 | 928 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
929 | rt_free(rth); |
930 | goal--; | |
1da177e4 | 931 | } |
22c047cc | 932 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
933 | if (goal <= 0) |
934 | break; | |
935 | } | |
936 | rover = k; | |
937 | ||
938 | if (goal <= 0) | |
939 | goto work_done; | |
940 | ||
941 | /* Goal is not achieved. We stop process if: | |
942 | ||
943 | - if expire reduced to zero. Otherwise, expire is halfed. | |
944 | - if table is not full. | |
945 | - if we are called from interrupt. | |
946 | - jiffies check is just fallback/debug loop breaker. | |
947 | We will not spin here for long time in any case. | |
948 | */ | |
949 | ||
950 | RT_CACHE_STAT_INC(gc_goal_miss); | |
951 | ||
952 | if (expire == 0) | |
953 | break; | |
954 | ||
955 | expire >>= 1; | |
956 | #if RT_CACHE_DEBUG >= 2 | |
957 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, | |
958 | atomic_read(&ipv4_dst_ops.entries), goal, i); | |
959 | #endif | |
960 | ||
961 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
962 | goto out; | |
963 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
964 | ||
965 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) | |
966 | goto out; | |
967 | if (net_ratelimit()) | |
968 | printk(KERN_WARNING "dst cache overflow\n"); | |
969 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
970 | return 1; | |
971 | ||
972 | work_done: | |
973 | expire += ip_rt_gc_min_interval; | |
974 | if (expire > ip_rt_gc_timeout || | |
975 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) | |
976 | expire = ip_rt_gc_timeout; | |
977 | #if RT_CACHE_DEBUG >= 2 | |
978 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, | |
979 | atomic_read(&ipv4_dst_ops.entries), goal, rover); | |
980 | #endif | |
981 | out: return 0; | |
982 | } | |
983 | ||
984 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) | |
985 | { | |
986 | struct rtable *rth, **rthp; | |
987 | unsigned long now; | |
988 | struct rtable *cand, **candp; | |
989 | u32 min_score; | |
990 | int chain_length; | |
991 | int attempts = !in_softirq(); | |
992 | ||
993 | restart: | |
994 | chain_length = 0; | |
995 | min_score = ~(u32)0; | |
996 | cand = NULL; | |
997 | candp = NULL; | |
998 | now = jiffies; | |
999 | ||
1000 | rthp = &rt_hash_table[hash].chain; | |
1001 | ||
22c047cc | 1002 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1003 | while ((rth = *rthp) != NULL) { |
e84f84f2 | 1004 | if (rt_is_expired(rth)) { |
29e75252 ED |
1005 | *rthp = rth->u.dst.rt_next; |
1006 | rt_free(rth); | |
1007 | continue; | |
1008 | } | |
b5921910 | 1009 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
1da177e4 | 1010 | /* Put it first */ |
093c2ca4 | 1011 | *rthp = rth->u.dst.rt_next; |
1da177e4 LT |
1012 | /* |
1013 | * Since lookup is lockfree, the deletion | |
1014 | * must be visible to another weakly ordered CPU before | |
1015 | * the insertion at the start of the hash chain. | |
1016 | */ | |
093c2ca4 | 1017 | rcu_assign_pointer(rth->u.dst.rt_next, |
1da177e4 LT |
1018 | rt_hash_table[hash].chain); |
1019 | /* | |
1020 | * Since lookup is lockfree, the update writes | |
1021 | * must be ordered for consistency on SMP. | |
1022 | */ | |
1023 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
1024 | ||
03f49f34 | 1025 | dst_use(&rth->u.dst, now); |
22c047cc | 1026 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1027 | |
1028 | rt_drop(rt); | |
1029 | *rp = rth; | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | if (!atomic_read(&rth->u.dst.__refcnt)) { | |
1034 | u32 score = rt_score(rth); | |
1035 | ||
1036 | if (score <= min_score) { | |
1037 | cand = rth; | |
1038 | candp = rthp; | |
1039 | min_score = score; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | chain_length++; | |
1044 | ||
093c2ca4 | 1045 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | if (cand) { | |
1049 | /* ip_rt_gc_elasticity used to be average length of chain | |
1050 | * length, when exceeded gc becomes really aggressive. | |
1051 | * | |
1052 | * The second limit is less certain. At the moment it allows | |
1053 | * only 2 entries per bucket. We will see. | |
1054 | */ | |
1055 | if (chain_length > ip_rt_gc_elasticity) { | |
093c2ca4 | 1056 | *candp = cand->u.dst.rt_next; |
1da177e4 LT |
1057 | rt_free(cand); |
1058 | } | |
1059 | } | |
1060 | ||
1061 | /* Try to bind route to arp only if it is output | |
1062 | route or unicast forwarding path. | |
1063 | */ | |
1064 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { | |
1065 | int err = arp_bind_neighbour(&rt->u.dst); | |
1066 | if (err) { | |
22c047cc | 1067 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1068 | |
1069 | if (err != -ENOBUFS) { | |
1070 | rt_drop(rt); | |
1071 | return err; | |
1072 | } | |
1073 | ||
1074 | /* Neighbour tables are full and nothing | |
1075 | can be released. Try to shrink route cache, | |
1076 | it is most likely it holds some neighbour records. | |
1077 | */ | |
1078 | if (attempts-- > 0) { | |
1079 | int saved_elasticity = ip_rt_gc_elasticity; | |
1080 | int saved_int = ip_rt_gc_min_interval; | |
1081 | ip_rt_gc_elasticity = 1; | |
1082 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1083 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1084 | ip_rt_gc_min_interval = saved_int; |
1085 | ip_rt_gc_elasticity = saved_elasticity; | |
1086 | goto restart; | |
1087 | } | |
1088 | ||
1089 | if (net_ratelimit()) | |
1090 | printk(KERN_WARNING "Neighbour table overflow.\n"); | |
1091 | rt_drop(rt); | |
1092 | return -ENOBUFS; | |
1093 | } | |
1094 | } | |
1095 | ||
093c2ca4 | 1096 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
1da177e4 | 1097 | #if RT_CACHE_DEBUG >= 2 |
093c2ca4 | 1098 | if (rt->u.dst.rt_next) { |
1da177e4 | 1099 | struct rtable *trt; |
a7d632b6 | 1100 | printk(KERN_DEBUG "rt_cache @%02x: " NIPQUAD_FMT, hash, |
1da177e4 | 1101 | NIPQUAD(rt->rt_dst)); |
093c2ca4 | 1102 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
a7d632b6 | 1103 | printk(" . " NIPQUAD_FMT, NIPQUAD(trt->rt_dst)); |
1da177e4 LT |
1104 | printk("\n"); |
1105 | } | |
1106 | #endif | |
1107 | rt_hash_table[hash].chain = rt; | |
22c047cc | 1108 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1109 | *rp = rt; |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | void rt_bind_peer(struct rtable *rt, int create) | |
1114 | { | |
1115 | static DEFINE_SPINLOCK(rt_peer_lock); | |
1116 | struct inet_peer *peer; | |
1117 | ||
1118 | peer = inet_getpeer(rt->rt_dst, create); | |
1119 | ||
1120 | spin_lock_bh(&rt_peer_lock); | |
1121 | if (rt->peer == NULL) { | |
1122 | rt->peer = peer; | |
1123 | peer = NULL; | |
1124 | } | |
1125 | spin_unlock_bh(&rt_peer_lock); | |
1126 | if (peer) | |
1127 | inet_putpeer(peer); | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1132 | * we still can generate some output. | |
1133 | * Random ID selection looks a bit dangerous because we have no chances to | |
1134 | * select ID being unique in a reasonable period of time. | |
1135 | * But broken packet identifier may be better than no packet at all. | |
1136 | */ | |
1137 | static void ip_select_fb_ident(struct iphdr *iph) | |
1138 | { | |
1139 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1140 | static u32 ip_fallback_id; | |
1141 | u32 salt; | |
1142 | ||
1143 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1144 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1145 | iph->id = htons(salt & 0xFFFF); |
1146 | ip_fallback_id = salt; | |
1147 | spin_unlock_bh(&ip_fb_id_lock); | |
1148 | } | |
1149 | ||
1150 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1151 | { | |
1152 | struct rtable *rt = (struct rtable *) dst; | |
1153 | ||
1154 | if (rt) { | |
1155 | if (rt->peer == NULL) | |
1156 | rt_bind_peer(rt, 1); | |
1157 | ||
1158 | /* If peer is attached to destination, it is never detached, | |
1159 | so that we need not to grab a lock to dereference it. | |
1160 | */ | |
1161 | if (rt->peer) { | |
1162 | iph->id = htons(inet_getid(rt->peer, more)); | |
1163 | return; | |
1164 | } | |
1165 | } else | |
e905a9ed | 1166 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1167 | __builtin_return_address(0)); |
1da177e4 LT |
1168 | |
1169 | ip_select_fb_ident(iph); | |
1170 | } | |
1171 | ||
1172 | static void rt_del(unsigned hash, struct rtable *rt) | |
1173 | { | |
29e75252 | 1174 | struct rtable **rthp, *aux; |
1da177e4 | 1175 | |
29e75252 | 1176 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1177 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1178 | ip_rt_put(rt); |
29e75252 | 1179 | while ((aux = *rthp) != NULL) { |
e84f84f2 | 1180 | if (aux == rt || rt_is_expired(aux)) { |
29e75252 ED |
1181 | *rthp = aux->u.dst.rt_next; |
1182 | rt_free(aux); | |
1183 | continue; | |
1da177e4 | 1184 | } |
29e75252 ED |
1185 | rthp = &aux->u.dst.rt_next; |
1186 | } | |
22c047cc | 1187 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1188 | } |
1189 | ||
f7655229 AV |
1190 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1191 | __be32 saddr, struct net_device *dev) | |
1da177e4 LT |
1192 | { |
1193 | int i, k; | |
1194 | struct in_device *in_dev = in_dev_get(dev); | |
1195 | struct rtable *rth, **rthp; | |
f7655229 | 1196 | __be32 skeys[2] = { saddr, 0 }; |
1da177e4 | 1197 | int ikeys[2] = { dev->ifindex, 0 }; |
8d71740c | 1198 | struct netevent_redirect netevent; |
317805b8 | 1199 | struct net *net; |
1da177e4 | 1200 | |
1da177e4 LT |
1201 | if (!in_dev) |
1202 | return; | |
1203 | ||
c346dca1 | 1204 | net = dev_net(dev); |
1da177e4 | 1205 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
1e637c74 | 1206 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
f97c1e0c | 1207 | || ipv4_is_zeronet(new_gw)) |
1da177e4 LT |
1208 | goto reject_redirect; |
1209 | ||
1210 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1211 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1212 | goto reject_redirect; | |
1213 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1214 | goto reject_redirect; | |
1215 | } else { | |
317805b8 | 1216 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1217 | goto reject_redirect; |
1218 | } | |
1219 | ||
1220 | for (i = 0; i < 2; i++) { | |
1221 | for (k = 0; k < 2; k++) { | |
b00180de | 1222 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k], |
e84f84f2 | 1223 | rt_genid(net)); |
1da177e4 LT |
1224 | |
1225 | rthp=&rt_hash_table[hash].chain; | |
1226 | ||
1227 | rcu_read_lock(); | |
1228 | while ((rth = rcu_dereference(*rthp)) != NULL) { | |
1229 | struct rtable *rt; | |
1230 | ||
1231 | if (rth->fl.fl4_dst != daddr || | |
1232 | rth->fl.fl4_src != skeys[i] || | |
1da177e4 | 1233 | rth->fl.oif != ikeys[k] || |
29e75252 | 1234 | rth->fl.iif != 0 || |
e84f84f2 | 1235 | rt_is_expired(rth) || |
878628fb | 1236 | !net_eq(dev_net(rth->u.dst.dev), net)) { |
093c2ca4 | 1237 | rthp = &rth->u.dst.rt_next; |
1da177e4 LT |
1238 | continue; |
1239 | } | |
1240 | ||
1241 | if (rth->rt_dst != daddr || | |
1242 | rth->rt_src != saddr || | |
1243 | rth->u.dst.error || | |
1244 | rth->rt_gateway != old_gw || | |
1245 | rth->u.dst.dev != dev) | |
1246 | break; | |
1247 | ||
1248 | dst_hold(&rth->u.dst); | |
1249 | rcu_read_unlock(); | |
1250 | ||
1251 | rt = dst_alloc(&ipv4_dst_ops); | |
1252 | if (rt == NULL) { | |
1253 | ip_rt_put(rth); | |
1254 | in_dev_put(in_dev); | |
1255 | return; | |
1256 | } | |
1257 | ||
1258 | /* Copy all the information. */ | |
1259 | *rt = *rth; | |
e905a9ed | 1260 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
1da177e4 LT |
1261 | rt->u.dst.__use = 1; |
1262 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1263 | rt->u.dst.child = NULL; | |
1264 | if (rt->u.dst.dev) | |
1265 | dev_hold(rt->u.dst.dev); | |
1266 | if (rt->idev) | |
1267 | in_dev_hold(rt->idev); | |
1268 | rt->u.dst.obsolete = 0; | |
1269 | rt->u.dst.lastuse = jiffies; | |
1270 | rt->u.dst.path = &rt->u.dst; | |
1271 | rt->u.dst.neighbour = NULL; | |
1272 | rt->u.dst.hh = NULL; | |
1273 | rt->u.dst.xfrm = NULL; | |
e84f84f2 | 1274 | rt->rt_genid = rt_genid(net); |
1da177e4 LT |
1275 | rt->rt_flags |= RTCF_REDIRECTED; |
1276 | ||
1277 | /* Gateway is different ... */ | |
1278 | rt->rt_gateway = new_gw; | |
1279 | ||
1280 | /* Redirect received -> path was valid */ | |
1281 | dst_confirm(&rth->u.dst); | |
1282 | ||
1283 | if (rt->peer) | |
1284 | atomic_inc(&rt->peer->refcnt); | |
1285 | ||
1286 | if (arp_bind_neighbour(&rt->u.dst) || | |
1287 | !(rt->u.dst.neighbour->nud_state & | |
1288 | NUD_VALID)) { | |
1289 | if (rt->u.dst.neighbour) | |
1290 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
1291 | ip_rt_put(rth); | |
1292 | rt_drop(rt); | |
1293 | goto do_next; | |
1294 | } | |
e905a9ed | 1295 | |
8d71740c TT |
1296 | netevent.old = &rth->u.dst; |
1297 | netevent.new = &rt->u.dst; | |
e905a9ed YH |
1298 | call_netevent_notifiers(NETEVENT_REDIRECT, |
1299 | &netevent); | |
1da177e4 LT |
1300 | |
1301 | rt_del(hash, rth); | |
1302 | if (!rt_intern_hash(hash, rt, &rt)) | |
1303 | ip_rt_put(rt); | |
1304 | goto do_next; | |
1305 | } | |
1306 | rcu_read_unlock(); | |
1307 | do_next: | |
1308 | ; | |
1309 | } | |
1310 | } | |
1311 | in_dev_put(in_dev); | |
1312 | return; | |
1313 | ||
1314 | reject_redirect: | |
1315 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1316 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
a7d632b6 YH |
1317 | printk(KERN_INFO "Redirect from " NIPQUAD_FMT " on %s about " |
1318 | NIPQUAD_FMT " ignored.\n" | |
1319 | " Advised path = " NIPQUAD_FMT " -> " NIPQUAD_FMT "\n", | |
1da177e4 | 1320 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
cef2685e | 1321 | NIPQUAD(saddr), NIPQUAD(daddr)); |
1da177e4 LT |
1322 | #endif |
1323 | in_dev_put(in_dev); | |
1324 | } | |
1325 | ||
1326 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) | |
1327 | { | |
ee6b9673 | 1328 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
1329 | struct dst_entry *ret = dst; |
1330 | ||
1331 | if (rt) { | |
1332 | if (dst->obsolete) { | |
1333 | ip_rt_put(rt); | |
1334 | ret = NULL; | |
1335 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || | |
1336 | rt->u.dst.expires) { | |
8c7bc840 | 1337 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
b00180de | 1338 | rt->fl.oif, |
e84f84f2 | 1339 | rt_genid(dev_net(dst->dev))); |
1da177e4 | 1340 | #if RT_CACHE_DEBUG >= 1 |
56c99d04 | 1341 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to " |
a7d632b6 | 1342 | NIPQUAD_FMT "/%02x dropped\n", |
1da177e4 LT |
1343 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); |
1344 | #endif | |
1345 | rt_del(hash, rt); | |
1346 | ret = NULL; | |
1347 | } | |
1348 | } | |
1349 | return ret; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Algorithm: | |
1354 | * 1. The first ip_rt_redirect_number redirects are sent | |
1355 | * with exponential backoff, then we stop sending them at all, | |
1356 | * assuming that the host ignores our redirects. | |
1357 | * 2. If we did not see packets requiring redirects | |
1358 | * during ip_rt_redirect_silence, we assume that the host | |
1359 | * forgot redirected route and start to send redirects again. | |
1360 | * | |
1361 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1362 | * in icmp.c. | |
1363 | * | |
1364 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1365 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1366 | */ | |
1367 | ||
1368 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1369 | { | |
ee6b9673 | 1370 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1371 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
1372 | ||
1373 | if (!in_dev) | |
1374 | return; | |
1375 | ||
1376 | if (!IN_DEV_TX_REDIRECTS(in_dev)) | |
1377 | goto out; | |
1378 | ||
1379 | /* No redirected packets during ip_rt_redirect_silence; | |
1380 | * reset the algorithm. | |
1381 | */ | |
1382 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) | |
1383 | rt->u.dst.rate_tokens = 0; | |
1384 | ||
1385 | /* Too many ignored redirects; do not send anything | |
1386 | * set u.dst.rate_last to the last seen redirected packet. | |
1387 | */ | |
1388 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { | |
1389 | rt->u.dst.rate_last = jiffies; | |
1390 | goto out; | |
1391 | } | |
1392 | ||
1393 | /* Check for load limit; set rate_last to the latest sent | |
1394 | * redirect. | |
1395 | */ | |
14fb8a76 LY |
1396 | if (rt->u.dst.rate_tokens == 0 || |
1397 | time_after(jiffies, | |
1da177e4 LT |
1398 | (rt->u.dst.rate_last + |
1399 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { | |
1400 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1401 | rt->u.dst.rate_last = jiffies; | |
1402 | ++rt->u.dst.rate_tokens; | |
1403 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1404 | if (IN_DEV_LOG_MARTIANS(in_dev) && | |
1405 | rt->u.dst.rate_tokens == ip_rt_redirect_number && | |
1406 | net_ratelimit()) | |
a7d632b6 YH |
1407 | printk(KERN_WARNING "host " NIPQUAD_FMT "/if%d ignores " |
1408 | "redirects for " NIPQUAD_FMT " to " NIPQUAD_FMT ".\n", | |
1da177e4 LT |
1409 | NIPQUAD(rt->rt_src), rt->rt_iif, |
1410 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); | |
1411 | #endif | |
1412 | } | |
1413 | out: | |
e905a9ed | 1414 | in_dev_put(in_dev); |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | static int ip_error(struct sk_buff *skb) | |
1418 | { | |
ee6b9673 | 1419 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1420 | unsigned long now; |
1421 | int code; | |
1422 | ||
1423 | switch (rt->u.dst.error) { | |
1424 | case EINVAL: | |
1425 | default: | |
1426 | goto out; | |
1427 | case EHOSTUNREACH: | |
1428 | code = ICMP_HOST_UNREACH; | |
1429 | break; | |
1430 | case ENETUNREACH: | |
1431 | code = ICMP_NET_UNREACH; | |
7f53878d | 1432 | IP_INC_STATS_BH(IPSTATS_MIB_INNOROUTES); |
1da177e4 LT |
1433 | break; |
1434 | case EACCES: | |
1435 | code = ICMP_PKT_FILTERED; | |
1436 | break; | |
1437 | } | |
1438 | ||
1439 | now = jiffies; | |
1440 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; | |
1441 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) | |
1442 | rt->u.dst.rate_tokens = ip_rt_error_burst; | |
1443 | rt->u.dst.rate_last = now; | |
1444 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { | |
1445 | rt->u.dst.rate_tokens -= ip_rt_error_cost; | |
1446 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1447 | } | |
1448 | ||
1449 | out: kfree_skb(skb); | |
1450 | return 0; | |
e905a9ed | 1451 | } |
1da177e4 LT |
1452 | |
1453 | /* | |
1454 | * The last two values are not from the RFC but | |
1455 | * are needed for AMPRnet AX.25 paths. | |
1456 | */ | |
1457 | ||
9b5b5cff | 1458 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1459 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1460 | ||
5969f71d | 1461 | static inline unsigned short guess_mtu(unsigned short old_mtu) |
1da177e4 LT |
1462 | { |
1463 | int i; | |
e905a9ed | 1464 | |
1da177e4 LT |
1465 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1466 | if (old_mtu > mtu_plateau[i]) | |
1467 | return mtu_plateau[i]; | |
1468 | return 68; | |
1469 | } | |
1470 | ||
b5921910 | 1471 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
0010e465 TT |
1472 | unsigned short new_mtu, |
1473 | struct net_device *dev) | |
1da177e4 | 1474 | { |
0010e465 | 1475 | int i, k; |
1da177e4 LT |
1476 | unsigned short old_mtu = ntohs(iph->tot_len); |
1477 | struct rtable *rth; | |
0010e465 | 1478 | int ikeys[2] = { dev->ifindex, 0 }; |
e448515c AV |
1479 | __be32 skeys[2] = { iph->saddr, 0, }; |
1480 | __be32 daddr = iph->daddr; | |
1da177e4 LT |
1481 | unsigned short est_mtu = 0; |
1482 | ||
1483 | if (ipv4_config.no_pmtu_disc) | |
1484 | return 0; | |
1485 | ||
0010e465 TT |
1486 | for (k = 0; k < 2; k++) { |
1487 | for (i = 0; i < 2; i++) { | |
b00180de | 1488 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k], |
e84f84f2 | 1489 | rt_genid(net)); |
0010e465 TT |
1490 | |
1491 | rcu_read_lock(); | |
1492 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
1493 | rth = rcu_dereference(rth->u.dst.rt_next)) { | |
1da177e4 LT |
1494 | unsigned short mtu = new_mtu; |
1495 | ||
0010e465 TT |
1496 | if (rth->fl.fl4_dst != daddr || |
1497 | rth->fl.fl4_src != skeys[i] || | |
1498 | rth->rt_dst != daddr || | |
1499 | rth->rt_src != iph->saddr || | |
1500 | rth->fl.oif != ikeys[k] || | |
1501 | rth->fl.iif != 0 || | |
1502 | dst_metric_locked(&rth->u.dst, RTAX_MTU) || | |
1503 | !net_eq(dev_net(rth->u.dst.dev), net) || | |
e84f84f2 | 1504 | !rt_is_expired(rth)) |
0010e465 TT |
1505 | continue; |
1506 | ||
1da177e4 LT |
1507 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
1508 | ||
1509 | /* BSD 4.2 compatibility hack :-( */ | |
1510 | if (mtu == 0 && | |
5ffc02a1 | 1511 | old_mtu >= dst_metric(&rth->u.dst, RTAX_MTU) && |
1da177e4 LT |
1512 | old_mtu >= 68 + (iph->ihl << 2)) |
1513 | old_mtu -= iph->ihl << 2; | |
1514 | ||
1515 | mtu = guess_mtu(old_mtu); | |
1516 | } | |
5ffc02a1 SS |
1517 | if (mtu <= dst_metric(&rth->u.dst, RTAX_MTU)) { |
1518 | if (mtu < dst_metric(&rth->u.dst, RTAX_MTU)) { | |
1da177e4 LT |
1519 | dst_confirm(&rth->u.dst); |
1520 | if (mtu < ip_rt_min_pmtu) { | |
1521 | mtu = ip_rt_min_pmtu; | |
1522 | rth->u.dst.metrics[RTAX_LOCK-1] |= | |
1523 | (1 << RTAX_MTU); | |
1524 | } | |
1525 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1526 | dst_set_expires(&rth->u.dst, | |
1527 | ip_rt_mtu_expires); | |
1528 | } | |
1529 | est_mtu = mtu; | |
1530 | } | |
1531 | } | |
0010e465 | 1532 | rcu_read_unlock(); |
1da177e4 | 1533 | } |
1da177e4 LT |
1534 | } |
1535 | return est_mtu ? : new_mtu; | |
1536 | } | |
1537 | ||
1538 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1539 | { | |
5ffc02a1 | 1540 | if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= 68 && |
1da177e4 LT |
1541 | !(dst_metric_locked(dst, RTAX_MTU))) { |
1542 | if (mtu < ip_rt_min_pmtu) { | |
1543 | mtu = ip_rt_min_pmtu; | |
1544 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); | |
1545 | } | |
1546 | dst->metrics[RTAX_MTU-1] = mtu; | |
1547 | dst_set_expires(dst, ip_rt_mtu_expires); | |
8d71740c | 1548 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
1549 | } |
1550 | } | |
1551 | ||
1552 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) | |
1553 | { | |
1554 | return NULL; | |
1555 | } | |
1556 | ||
1557 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1558 | { | |
1559 | struct rtable *rt = (struct rtable *) dst; | |
1560 | struct inet_peer *peer = rt->peer; | |
1561 | struct in_device *idev = rt->idev; | |
1562 | ||
1563 | if (peer) { | |
1564 | rt->peer = NULL; | |
1565 | inet_putpeer(peer); | |
1566 | } | |
1567 | ||
1568 | if (idev) { | |
1569 | rt->idev = NULL; | |
1570 | in_dev_put(idev); | |
1571 | } | |
1572 | } | |
1573 | ||
1574 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
1575 | int how) | |
1576 | { | |
1577 | struct rtable *rt = (struct rtable *) dst; | |
1578 | struct in_device *idev = rt->idev; | |
c346dca1 | 1579 | if (dev != dev_net(dev)->loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 | 1580 | struct in_device *loopback_idev = |
c346dca1 | 1581 | in_dev_get(dev_net(dev)->loopback_dev); |
1da177e4 LT |
1582 | if (loopback_idev) { |
1583 | rt->idev = loopback_idev; | |
1584 | in_dev_put(idev); | |
1585 | } | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | static void ipv4_link_failure(struct sk_buff *skb) | |
1590 | { | |
1591 | struct rtable *rt; | |
1592 | ||
1593 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1594 | ||
ee6b9673 | 1595 | rt = skb->rtable; |
1da177e4 LT |
1596 | if (rt) |
1597 | dst_set_expires(&rt->u.dst, 0); | |
1598 | } | |
1599 | ||
1600 | static int ip_rt_bug(struct sk_buff *skb) | |
1601 | { | |
a7d632b6 | 1602 | printk(KERN_DEBUG "ip_rt_bug: " NIPQUAD_FMT " -> " NIPQUAD_FMT ", %s\n", |
eddc9ec5 | 1603 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
1da177e4 LT |
1604 | skb->dev ? skb->dev->name : "?"); |
1605 | kfree_skb(skb); | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | We do not cache source address of outgoing interface, | |
1611 | because it is used only by IP RR, TS and SRR options, | |
1612 | so that it out of fast path. | |
1613 | ||
1614 | BTW remember: "addr" is allowed to be not aligned | |
1615 | in IP options! | |
1616 | */ | |
1617 | ||
1618 | void ip_rt_get_source(u8 *addr, struct rtable *rt) | |
1619 | { | |
a61ced5d | 1620 | __be32 src; |
1da177e4 LT |
1621 | struct fib_result res; |
1622 | ||
1623 | if (rt->fl.iif == 0) | |
1624 | src = rt->rt_src; | |
c346dca1 | 1625 | else if (fib_lookup(dev_net(rt->u.dst.dev), &rt->fl, &res) == 0) { |
1da177e4 LT |
1626 | src = FIB_RES_PREFSRC(res); |
1627 | fib_res_put(&res); | |
1628 | } else | |
1629 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, | |
1630 | RT_SCOPE_UNIVERSE); | |
1631 | memcpy(addr, &src, 4); | |
1632 | } | |
1633 | ||
1634 | #ifdef CONFIG_NET_CLS_ROUTE | |
1635 | static void set_class_tag(struct rtable *rt, u32 tag) | |
1636 | { | |
1637 | if (!(rt->u.dst.tclassid & 0xFFFF)) | |
1638 | rt->u.dst.tclassid |= tag & 0xFFFF; | |
1639 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) | |
1640 | rt->u.dst.tclassid |= tag & 0xFFFF0000; | |
1641 | } | |
1642 | #endif | |
1643 | ||
1644 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) | |
1645 | { | |
1646 | struct fib_info *fi = res->fi; | |
1647 | ||
1648 | if (fi) { | |
1649 | if (FIB_RES_GW(*res) && | |
1650 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1651 | rt->rt_gateway = FIB_RES_GW(*res); | |
1652 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
1653 | sizeof(rt->u.dst.metrics)); | |
1654 | if (fi->fib_mtu == 0) { | |
1655 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
0bbeafd0 | 1656 | if (dst_metric_locked(&rt->u.dst, RTAX_MTU) && |
1da177e4 LT |
1657 | rt->rt_gateway != rt->rt_dst && |
1658 | rt->u.dst.dev->mtu > 576) | |
1659 | rt->u.dst.metrics[RTAX_MTU-1] = 576; | |
1660 | } | |
1661 | #ifdef CONFIG_NET_CLS_ROUTE | |
1662 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; | |
1663 | #endif | |
1664 | } else | |
1665 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; | |
1666 | ||
5ffc02a1 | 1667 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1668 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; |
5ffc02a1 | 1669 | if (dst_metric(&rt->u.dst, RTAX_MTU) > IP_MAX_MTU) |
1da177e4 | 1670 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; |
5ffc02a1 | 1671 | if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0) |
1da177e4 LT |
1672 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, |
1673 | ip_rt_min_advmss); | |
5ffc02a1 | 1674 | if (dst_metric(&rt->u.dst, RTAX_ADVMSS) > 65535 - 40) |
1da177e4 LT |
1675 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; |
1676 | ||
1677 | #ifdef CONFIG_NET_CLS_ROUTE | |
1678 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1679 | set_class_tag(rt, fib_rules_tclass(res)); | |
1680 | #endif | |
1681 | set_class_tag(rt, itag); | |
1682 | #endif | |
e905a9ed | 1683 | rt->rt_type = res->type; |
1da177e4 LT |
1684 | } |
1685 | ||
9e12bb22 | 1686 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1687 | u8 tos, struct net_device *dev, int our) |
1688 | { | |
1689 | unsigned hash; | |
1690 | struct rtable *rth; | |
a61ced5d | 1691 | __be32 spec_dst; |
1da177e4 LT |
1692 | struct in_device *in_dev = in_dev_get(dev); |
1693 | u32 itag = 0; | |
1694 | ||
1695 | /* Primary sanity checks. */ | |
1696 | ||
1697 | if (in_dev == NULL) | |
1698 | return -EINVAL; | |
1699 | ||
1e637c74 | 1700 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1701 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1702 | goto e_inval; |
1703 | ||
f97c1e0c JP |
1704 | if (ipv4_is_zeronet(saddr)) { |
1705 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1706 | goto e_inval; |
1707 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
1708 | } else if (fib_validate_source(saddr, 0, tos, 0, | |
1709 | dev, &spec_dst, &itag) < 0) | |
1710 | goto e_inval; | |
1711 | ||
1712 | rth = dst_alloc(&ipv4_dst_ops); | |
1713 | if (!rth) | |
1714 | goto e_nobufs; | |
1715 | ||
1716 | rth->u.dst.output= ip_rt_bug; | |
1717 | ||
1718 | atomic_set(&rth->u.dst.__refcnt, 1); | |
1719 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 1720 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
1721 | rth->u.dst.flags |= DST_NOPOLICY; |
1722 | rth->fl.fl4_dst = daddr; | |
1723 | rth->rt_dst = daddr; | |
1724 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1725 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1726 | rth->fl.fl4_src = saddr; |
1727 | rth->rt_src = saddr; | |
1728 | #ifdef CONFIG_NET_CLS_ROUTE | |
1729 | rth->u.dst.tclassid = itag; | |
1730 | #endif | |
1731 | rth->rt_iif = | |
1732 | rth->fl.iif = dev->ifindex; | |
2774c7ab | 1733 | rth->u.dst.dev = init_net.loopback_dev; |
1da177e4 LT |
1734 | dev_hold(rth->u.dst.dev); |
1735 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1736 | rth->fl.oif = 0; | |
1737 | rth->rt_gateway = daddr; | |
1738 | rth->rt_spec_dst= spec_dst; | |
e84f84f2 | 1739 | rth->rt_genid = rt_genid(dev_net(dev)); |
1da177e4 | 1740 | rth->rt_flags = RTCF_MULTICAST; |
29e75252 | 1741 | rth->rt_type = RTN_MULTICAST; |
1da177e4 LT |
1742 | if (our) { |
1743 | rth->u.dst.input= ip_local_deliver; | |
1744 | rth->rt_flags |= RTCF_LOCAL; | |
1745 | } | |
1746 | ||
1747 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1748 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
1da177e4 LT |
1749 | rth->u.dst.input = ip_mr_input; |
1750 | #endif | |
1751 | RT_CACHE_STAT_INC(in_slow_mc); | |
1752 | ||
1753 | in_dev_put(in_dev); | |
e84f84f2 | 1754 | hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev))); |
ee6b9673 | 1755 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1756 | |
1757 | e_nobufs: | |
1758 | in_dev_put(in_dev); | |
1759 | return -ENOBUFS; | |
1760 | ||
1761 | e_inval: | |
1762 | in_dev_put(in_dev); | |
1763 | return -EINVAL; | |
1764 | } | |
1765 | ||
1766 | ||
1767 | static void ip_handle_martian_source(struct net_device *dev, | |
1768 | struct in_device *in_dev, | |
1769 | struct sk_buff *skb, | |
9e12bb22 AV |
1770 | __be32 daddr, |
1771 | __be32 saddr) | |
1da177e4 LT |
1772 | { |
1773 | RT_CACHE_STAT_INC(in_martian_src); | |
1774 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1775 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1776 | /* | |
1777 | * RFC1812 recommendation, if source is martian, | |
1778 | * the only hint is MAC header. | |
1779 | */ | |
a7d632b6 YH |
1780 | printk(KERN_WARNING "martian source " NIPQUAD_FMT " from " |
1781 | NIPQUAD_FMT", on dev %s\n", | |
1da177e4 | 1782 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
98e399f8 | 1783 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1784 | int i; |
98e399f8 | 1785 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1786 | printk(KERN_WARNING "ll header: "); |
1787 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1788 | printk("%02x", *p); | |
1789 | if (i < (dev->hard_header_len - 1)) | |
1790 | printk(":"); | |
1791 | } | |
1792 | printk("\n"); | |
1793 | } | |
1794 | } | |
1795 | #endif | |
1796 | } | |
1797 | ||
5969f71d SH |
1798 | static int __mkroute_input(struct sk_buff *skb, |
1799 | struct fib_result *res, | |
1800 | struct in_device *in_dev, | |
1801 | __be32 daddr, __be32 saddr, u32 tos, | |
1802 | struct rtable **result) | |
1da177e4 LT |
1803 | { |
1804 | ||
1805 | struct rtable *rth; | |
1806 | int err; | |
1807 | struct in_device *out_dev; | |
1808 | unsigned flags = 0; | |
d9c9df8c AV |
1809 | __be32 spec_dst; |
1810 | u32 itag; | |
1da177e4 LT |
1811 | |
1812 | /* get a working reference to the output device */ | |
1813 | out_dev = in_dev_get(FIB_RES_DEV(*res)); | |
1814 | if (out_dev == NULL) { | |
1815 | if (net_ratelimit()) | |
1816 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1817 | "_slow(). Please, report\n"); | |
1818 | return -EINVAL; | |
1819 | } | |
1820 | ||
1821 | ||
e905a9ed | 1822 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
1da177e4 LT |
1823 | in_dev->dev, &spec_dst, &itag); |
1824 | if (err < 0) { | |
e905a9ed | 1825 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1826 | saddr); |
e905a9ed | 1827 | |
1da177e4 LT |
1828 | err = -EINVAL; |
1829 | goto cleanup; | |
1830 | } | |
1831 | ||
1832 | if (err) | |
1833 | flags |= RTCF_DIRECTSRC; | |
1834 | ||
51b77cae | 1835 | if (out_dev == in_dev && err && |
1da177e4 LT |
1836 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1837 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1838 | flags |= RTCF_DOREDIRECT; | |
1839 | ||
1840 | if (skb->protocol != htons(ETH_P_IP)) { | |
1841 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1842 | * invalid for proxy arp. DNAT routes are always valid. | |
1843 | */ | |
cb7928a5 | 1844 | if (out_dev == in_dev) { |
1da177e4 LT |
1845 | err = -EINVAL; |
1846 | goto cleanup; | |
1847 | } | |
1848 | } | |
1849 | ||
1850 | ||
1851 | rth = dst_alloc(&ipv4_dst_ops); | |
1852 | if (!rth) { | |
1853 | err = -ENOBUFS; | |
1854 | goto cleanup; | |
1855 | } | |
1856 | ||
ce723d8e | 1857 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 1858 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 1859 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 | 1860 | rth->u.dst.flags |= DST_NOPOLICY; |
42f811b8 | 1861 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
1da177e4 LT |
1862 | rth->u.dst.flags |= DST_NOXFRM; |
1863 | rth->fl.fl4_dst = daddr; | |
1864 | rth->rt_dst = daddr; | |
1865 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 1866 | rth->fl.mark = skb->mark; |
1da177e4 LT |
1867 | rth->fl.fl4_src = saddr; |
1868 | rth->rt_src = saddr; | |
1869 | rth->rt_gateway = daddr; | |
1870 | rth->rt_iif = | |
1871 | rth->fl.iif = in_dev->dev->ifindex; | |
1872 | rth->u.dst.dev = (out_dev)->dev; | |
1873 | dev_hold(rth->u.dst.dev); | |
1874 | rth->idev = in_dev_get(rth->u.dst.dev); | |
1875 | rth->fl.oif = 0; | |
1876 | rth->rt_spec_dst= spec_dst; | |
1877 | ||
1878 | rth->u.dst.input = ip_forward; | |
1879 | rth->u.dst.output = ip_output; | |
e84f84f2 | 1880 | rth->rt_genid = rt_genid(dev_net(rth->u.dst.dev)); |
1da177e4 LT |
1881 | |
1882 | rt_set_nexthop(rth, res, itag); | |
1883 | ||
1884 | rth->rt_flags = flags; | |
1885 | ||
1886 | *result = rth; | |
1887 | err = 0; | |
1888 | cleanup: | |
1889 | /* release the working reference to the output device */ | |
1890 | in_dev_put(out_dev); | |
1891 | return err; | |
e905a9ed | 1892 | } |
1da177e4 | 1893 | |
5969f71d SH |
1894 | static int ip_mkroute_input(struct sk_buff *skb, |
1895 | struct fib_result *res, | |
1896 | const struct flowi *fl, | |
1897 | struct in_device *in_dev, | |
1898 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1899 | { |
7abaa27c | 1900 | struct rtable* rth = NULL; |
1da177e4 LT |
1901 | int err; |
1902 | unsigned hash; | |
1903 | ||
1904 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1905 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) | |
1906 | fib_select_multipath(fl, res); | |
1907 | #endif | |
1908 | ||
1909 | /* create a routing cache entry */ | |
1910 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1911 | if (err) | |
1912 | return err; | |
1da177e4 LT |
1913 | |
1914 | /* put it into the cache */ | |
e84f84f2 DL |
1915 | hash = rt_hash(daddr, saddr, fl->iif, |
1916 | rt_genid(dev_net(rth->u.dst.dev))); | |
ee6b9673 | 1917 | return rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
1918 | } |
1919 | ||
1da177e4 LT |
1920 | /* |
1921 | * NOTE. We drop all the packets that has local source | |
1922 | * addresses, because every properly looped back packet | |
1923 | * must have correct destination already attached by output routine. | |
1924 | * | |
1925 | * Such approach solves two big problems: | |
1926 | * 1. Not simplex devices are handled properly. | |
1927 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
1928 | */ | |
1929 | ||
9e12bb22 | 1930 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1931 | u8 tos, struct net_device *dev) |
1932 | { | |
1933 | struct fib_result res; | |
1934 | struct in_device *in_dev = in_dev_get(dev); | |
1935 | struct flowi fl = { .nl_u = { .ip4_u = | |
1936 | { .daddr = daddr, | |
1937 | .saddr = saddr, | |
1938 | .tos = tos, | |
1939 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1940 | } }, |
47dcf0cb | 1941 | .mark = skb->mark, |
1da177e4 LT |
1942 | .iif = dev->ifindex }; |
1943 | unsigned flags = 0; | |
1944 | u32 itag = 0; | |
1945 | struct rtable * rth; | |
1946 | unsigned hash; | |
9e12bb22 | 1947 | __be32 spec_dst; |
1da177e4 LT |
1948 | int err = -EINVAL; |
1949 | int free_res = 0; | |
c346dca1 | 1950 | struct net * net = dev_net(dev); |
1da177e4 LT |
1951 | |
1952 | /* IP on this device is disabled. */ | |
1953 | ||
1954 | if (!in_dev) | |
1955 | goto out; | |
1956 | ||
1957 | /* Check for the most weird martians, which can be not detected | |
1958 | by fib_lookup. | |
1959 | */ | |
1960 | ||
1e637c74 | 1961 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1962 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
1963 | goto martian_source; |
1964 | ||
e448515c | 1965 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1966 | goto brd_input; |
1967 | ||
1968 | /* Accept zero addresses only to limited broadcast; | |
1969 | * I even do not know to fix it or not. Waiting for complains :-) | |
1970 | */ | |
f97c1e0c | 1971 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1972 | goto martian_source; |
1973 | ||
1e637c74 | 1974 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
f97c1e0c | 1975 | ipv4_is_loopback(daddr)) |
1da177e4 LT |
1976 | goto martian_destination; |
1977 | ||
1978 | /* | |
1979 | * Now we are ready to route packet. | |
1980 | */ | |
84a885f4 | 1981 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
1da177e4 | 1982 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 1983 | goto e_hostunreach; |
1da177e4 LT |
1984 | goto no_route; |
1985 | } | |
1986 | free_res = 1; | |
1987 | ||
1988 | RT_CACHE_STAT_INC(in_slow_tot); | |
1989 | ||
1990 | if (res.type == RTN_BROADCAST) | |
1991 | goto brd_input; | |
1992 | ||
1993 | if (res.type == RTN_LOCAL) { | |
1994 | int result; | |
1995 | result = fib_validate_source(saddr, daddr, tos, | |
84a885f4 | 1996 | net->loopback_dev->ifindex, |
1da177e4 LT |
1997 | dev, &spec_dst, &itag); |
1998 | if (result < 0) | |
1999 | goto martian_source; | |
2000 | if (result) | |
2001 | flags |= RTCF_DIRECTSRC; | |
2002 | spec_dst = daddr; | |
2003 | goto local_input; | |
2004 | } | |
2005 | ||
2006 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 2007 | goto e_hostunreach; |
1da177e4 LT |
2008 | if (res.type != RTN_UNICAST) |
2009 | goto martian_destination; | |
2010 | ||
2011 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); | |
1da177e4 LT |
2012 | done: |
2013 | in_dev_put(in_dev); | |
2014 | if (free_res) | |
2015 | fib_res_put(&res); | |
2016 | out: return err; | |
2017 | ||
2018 | brd_input: | |
2019 | if (skb->protocol != htons(ETH_P_IP)) | |
2020 | goto e_inval; | |
2021 | ||
f97c1e0c | 2022 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2023 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
2024 | else { | |
2025 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, | |
2026 | &itag); | |
2027 | if (err < 0) | |
2028 | goto martian_source; | |
2029 | if (err) | |
2030 | flags |= RTCF_DIRECTSRC; | |
2031 | } | |
2032 | flags |= RTCF_BROADCAST; | |
2033 | res.type = RTN_BROADCAST; | |
2034 | RT_CACHE_STAT_INC(in_brd); | |
2035 | ||
2036 | local_input: | |
2037 | rth = dst_alloc(&ipv4_dst_ops); | |
2038 | if (!rth) | |
2039 | goto e_nobufs; | |
2040 | ||
2041 | rth->u.dst.output= ip_rt_bug; | |
e84f84f2 | 2042 | rth->rt_genid = rt_genid(net); |
1da177e4 LT |
2043 | |
2044 | atomic_set(&rth->u.dst.__refcnt, 1); | |
2045 | rth->u.dst.flags= DST_HOST; | |
42f811b8 | 2046 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2047 | rth->u.dst.flags |= DST_NOPOLICY; |
2048 | rth->fl.fl4_dst = daddr; | |
2049 | rth->rt_dst = daddr; | |
2050 | rth->fl.fl4_tos = tos; | |
47dcf0cb | 2051 | rth->fl.mark = skb->mark; |
1da177e4 LT |
2052 | rth->fl.fl4_src = saddr; |
2053 | rth->rt_src = saddr; | |
2054 | #ifdef CONFIG_NET_CLS_ROUTE | |
2055 | rth->u.dst.tclassid = itag; | |
2056 | #endif | |
2057 | rth->rt_iif = | |
2058 | rth->fl.iif = dev->ifindex; | |
84a885f4 | 2059 | rth->u.dst.dev = net->loopback_dev; |
1da177e4 LT |
2060 | dev_hold(rth->u.dst.dev); |
2061 | rth->idev = in_dev_get(rth->u.dst.dev); | |
2062 | rth->rt_gateway = daddr; | |
2063 | rth->rt_spec_dst= spec_dst; | |
2064 | rth->u.dst.input= ip_local_deliver; | |
2065 | rth->rt_flags = flags|RTCF_LOCAL; | |
2066 | if (res.type == RTN_UNREACHABLE) { | |
2067 | rth->u.dst.input= ip_error; | |
2068 | rth->u.dst.error= -err; | |
2069 | rth->rt_flags &= ~RTCF_LOCAL; | |
2070 | } | |
2071 | rth->rt_type = res.type; | |
e84f84f2 | 2072 | hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net)); |
ee6b9673 | 2073 | err = rt_intern_hash(hash, rth, &skb->rtable); |
1da177e4 LT |
2074 | goto done; |
2075 | ||
2076 | no_route: | |
2077 | RT_CACHE_STAT_INC(in_no_route); | |
2078 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2079 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2080 | if (err == -ESRCH) |
2081 | err = -ENETUNREACH; | |
1da177e4 LT |
2082 | goto local_input; |
2083 | ||
2084 | /* | |
2085 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2086 | */ | |
2087 | martian_destination: | |
2088 | RT_CACHE_STAT_INC(in_martian_dst); | |
2089 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2090 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
a7d632b6 YH |
2091 | printk(KERN_WARNING "martian destination " NIPQUAD_FMT " from " |
2092 | NIPQUAD_FMT ", dev %s\n", | |
1da177e4 LT |
2093 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
2094 | #endif | |
2c2910a4 DE |
2095 | |
2096 | e_hostunreach: | |
e905a9ed YH |
2097 | err = -EHOSTUNREACH; |
2098 | goto done; | |
2c2910a4 | 2099 | |
1da177e4 LT |
2100 | e_inval: |
2101 | err = -EINVAL; | |
2102 | goto done; | |
2103 | ||
2104 | e_nobufs: | |
2105 | err = -ENOBUFS; | |
2106 | goto done; | |
2107 | ||
2108 | martian_source: | |
2109 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2110 | goto e_inval; | |
2111 | } | |
2112 | ||
9e12bb22 | 2113 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2114 | u8 tos, struct net_device *dev) |
2115 | { | |
2116 | struct rtable * rth; | |
2117 | unsigned hash; | |
2118 | int iif = dev->ifindex; | |
b5921910 | 2119 | struct net *net; |
1da177e4 | 2120 | |
c346dca1 | 2121 | net = dev_net(dev); |
1da177e4 | 2122 | tos &= IPTOS_RT_MASK; |
e84f84f2 | 2123 | hash = rt_hash(daddr, saddr, iif, rt_genid(net)); |
1da177e4 LT |
2124 | |
2125 | rcu_read_lock(); | |
2126 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2127 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
c0b8c32b SH |
2128 | if (((rth->fl.fl4_dst ^ daddr) | |
2129 | (rth->fl.fl4_src ^ saddr) | | |
2130 | (rth->fl.iif ^ iif) | | |
2131 | rth->fl.oif | | |
2132 | (rth->fl.fl4_tos ^ tos)) == 0 && | |
47dcf0cb | 2133 | rth->fl.mark == skb->mark && |
878628fb | 2134 | net_eq(dev_net(rth->u.dst.dev), net) && |
e84f84f2 | 2135 | !rt_is_expired(rth)) { |
03f49f34 | 2136 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2137 | RT_CACHE_STAT_INC(in_hit); |
2138 | rcu_read_unlock(); | |
ee6b9673 | 2139 | skb->rtable = rth; |
1da177e4 LT |
2140 | return 0; |
2141 | } | |
2142 | RT_CACHE_STAT_INC(in_hlist_search); | |
2143 | } | |
2144 | rcu_read_unlock(); | |
2145 | ||
2146 | /* Multicast recognition logic is moved from route cache to here. | |
2147 | The problem was that too many Ethernet cards have broken/missing | |
2148 | hardware multicast filters :-( As result the host on multicasting | |
2149 | network acquires a lot of useless route cache entries, sort of | |
2150 | SDR messages from all the world. Now we try to get rid of them. | |
2151 | Really, provided software IP multicast filter is organized | |
2152 | reasonably (at least, hashed), it does not result in a slowdown | |
2153 | comparing with route cache reject entries. | |
2154 | Note, that multicast routers are not affected, because | |
2155 | route cache entry is created eventually. | |
2156 | */ | |
f97c1e0c | 2157 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
2158 | struct in_device *in_dev; |
2159 | ||
2160 | rcu_read_lock(); | |
e5ed6399 | 2161 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
1da177e4 | 2162 | int our = ip_check_mc(in_dev, daddr, saddr, |
eddc9ec5 | 2163 | ip_hdr(skb)->protocol); |
1da177e4 LT |
2164 | if (our |
2165 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c JP |
2166 | || (!ipv4_is_local_multicast(daddr) && |
2167 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 LT |
2168 | #endif |
2169 | ) { | |
2170 | rcu_read_unlock(); | |
2171 | return ip_route_input_mc(skb, daddr, saddr, | |
2172 | tos, dev, our); | |
2173 | } | |
2174 | } | |
2175 | rcu_read_unlock(); | |
2176 | return -EINVAL; | |
2177 | } | |
2178 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); | |
2179 | } | |
2180 | ||
5969f71d SH |
2181 | static int __mkroute_output(struct rtable **result, |
2182 | struct fib_result *res, | |
2183 | const struct flowi *fl, | |
2184 | const struct flowi *oldflp, | |
2185 | struct net_device *dev_out, | |
2186 | unsigned flags) | |
1da177e4 LT |
2187 | { |
2188 | struct rtable *rth; | |
2189 | struct in_device *in_dev; | |
2190 | u32 tos = RT_FL_TOS(oldflp); | |
2191 | int err = 0; | |
2192 | ||
f97c1e0c | 2193 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
1da177e4 LT |
2194 | return -EINVAL; |
2195 | ||
e448515c | 2196 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
1da177e4 | 2197 | res->type = RTN_BROADCAST; |
f97c1e0c | 2198 | else if (ipv4_is_multicast(fl->fl4_dst)) |
1da177e4 | 2199 | res->type = RTN_MULTICAST; |
1e637c74 | 2200 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
1da177e4 LT |
2201 | return -EINVAL; |
2202 | ||
2203 | if (dev_out->flags & IFF_LOOPBACK) | |
2204 | flags |= RTCF_LOCAL; | |
2205 | ||
2206 | /* get work reference to inet device */ | |
2207 | in_dev = in_dev_get(dev_out); | |
2208 | if (!in_dev) | |
2209 | return -EINVAL; | |
2210 | ||
2211 | if (res->type == RTN_BROADCAST) { | |
2212 | flags |= RTCF_BROADCAST | RTCF_LOCAL; | |
2213 | if (res->fi) { | |
2214 | fib_info_put(res->fi); | |
2215 | res->fi = NULL; | |
2216 | } | |
2217 | } else if (res->type == RTN_MULTICAST) { | |
2218 | flags |= RTCF_MULTICAST|RTCF_LOCAL; | |
e905a9ed | 2219 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
1da177e4 LT |
2220 | oldflp->proto)) |
2221 | flags &= ~RTCF_LOCAL; | |
2222 | /* If multicast route do not exist use | |
2223 | default one, but do not gateway in this case. | |
2224 | Yes, it is hack. | |
2225 | */ | |
2226 | if (res->fi && res->prefixlen < 4) { | |
2227 | fib_info_put(res->fi); | |
2228 | res->fi = NULL; | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | ||
2233 | rth = dst_alloc(&ipv4_dst_ops); | |
2234 | if (!rth) { | |
2235 | err = -ENOBUFS; | |
2236 | goto cleanup; | |
e905a9ed | 2237 | } |
1da177e4 | 2238 | |
ce723d8e | 2239 | atomic_set(&rth->u.dst.__refcnt, 1); |
1da177e4 | 2240 | rth->u.dst.flags= DST_HOST; |
42f811b8 | 2241 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
1da177e4 | 2242 | rth->u.dst.flags |= DST_NOXFRM; |
42f811b8 | 2243 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
1da177e4 LT |
2244 | rth->u.dst.flags |= DST_NOPOLICY; |
2245 | ||
2246 | rth->fl.fl4_dst = oldflp->fl4_dst; | |
2247 | rth->fl.fl4_tos = tos; | |
2248 | rth->fl.fl4_src = oldflp->fl4_src; | |
2249 | rth->fl.oif = oldflp->oif; | |
47dcf0cb | 2250 | rth->fl.mark = oldflp->mark; |
1da177e4 LT |
2251 | rth->rt_dst = fl->fl4_dst; |
2252 | rth->rt_src = fl->fl4_src; | |
2253 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; | |
e905a9ed | 2254 | /* get references to the devices that are to be hold by the routing |
1da177e4 LT |
2255 | cache entry */ |
2256 | rth->u.dst.dev = dev_out; | |
2257 | dev_hold(dev_out); | |
2258 | rth->idev = in_dev_get(dev_out); | |
2259 | rth->rt_gateway = fl->fl4_dst; | |
2260 | rth->rt_spec_dst= fl->fl4_src; | |
2261 | ||
2262 | rth->u.dst.output=ip_output; | |
e84f84f2 | 2263 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
1da177e4 LT |
2264 | |
2265 | RT_CACHE_STAT_INC(out_slow_tot); | |
2266 | ||
2267 | if (flags & RTCF_LOCAL) { | |
2268 | rth->u.dst.input = ip_local_deliver; | |
2269 | rth->rt_spec_dst = fl->fl4_dst; | |
2270 | } | |
2271 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
2272 | rth->rt_spec_dst = fl->fl4_src; | |
e905a9ed | 2273 | if (flags & RTCF_LOCAL && |
1da177e4 LT |
2274 | !(dev_out->flags & IFF_LOOPBACK)) { |
2275 | rth->u.dst.output = ip_mc_output; | |
2276 | RT_CACHE_STAT_INC(out_slow_mc); | |
2277 | } | |
2278 | #ifdef CONFIG_IP_MROUTE | |
2279 | if (res->type == RTN_MULTICAST) { | |
2280 | if (IN_DEV_MFORWARD(in_dev) && | |
f97c1e0c | 2281 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
1da177e4 LT |
2282 | rth->u.dst.input = ip_mr_input; |
2283 | rth->u.dst.output = ip_mc_output; | |
2284 | } | |
2285 | } | |
2286 | #endif | |
2287 | } | |
2288 | ||
2289 | rt_set_nexthop(rth, res, 0); | |
2290 | ||
2291 | rth->rt_flags = flags; | |
2292 | ||
2293 | *result = rth; | |
2294 | cleanup: | |
2295 | /* release work reference to inet device */ | |
2296 | in_dev_put(in_dev); | |
2297 | ||
2298 | return err; | |
2299 | } | |
2300 | ||
5969f71d SH |
2301 | static int ip_mkroute_output(struct rtable **rp, |
2302 | struct fib_result *res, | |
2303 | const struct flowi *fl, | |
2304 | const struct flowi *oldflp, | |
2305 | struct net_device *dev_out, | |
2306 | unsigned flags) | |
1da177e4 | 2307 | { |
7abaa27c | 2308 | struct rtable *rth = NULL; |
1da177e4 LT |
2309 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
2310 | unsigned hash; | |
2311 | if (err == 0) { | |
b00180de | 2312 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif, |
e84f84f2 | 2313 | rt_genid(dev_net(dev_out))); |
1da177e4 LT |
2314 | err = rt_intern_hash(hash, rth, rp); |
2315 | } | |
e905a9ed | 2316 | |
1da177e4 LT |
2317 | return err; |
2318 | } | |
2319 | ||
1da177e4 LT |
2320 | /* |
2321 | * Major route resolver routine. | |
2322 | */ | |
2323 | ||
b40afd0e DL |
2324 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
2325 | const struct flowi *oldflp) | |
1da177e4 LT |
2326 | { |
2327 | u32 tos = RT_FL_TOS(oldflp); | |
2328 | struct flowi fl = { .nl_u = { .ip4_u = | |
2329 | { .daddr = oldflp->fl4_dst, | |
2330 | .saddr = oldflp->fl4_src, | |
2331 | .tos = tos & IPTOS_RT_MASK, | |
2332 | .scope = ((tos & RTO_ONLINK) ? | |
2333 | RT_SCOPE_LINK : | |
2334 | RT_SCOPE_UNIVERSE), | |
1da177e4 | 2335 | } }, |
47dcf0cb | 2336 | .mark = oldflp->mark, |
b40afd0e | 2337 | .iif = net->loopback_dev->ifindex, |
1da177e4 LT |
2338 | .oif = oldflp->oif }; |
2339 | struct fib_result res; | |
2340 | unsigned flags = 0; | |
2341 | struct net_device *dev_out = NULL; | |
2342 | int free_res = 0; | |
2343 | int err; | |
2344 | ||
2345 | ||
2346 | res.fi = NULL; | |
2347 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2348 | res.r = NULL; | |
2349 | #endif | |
2350 | ||
2351 | if (oldflp->fl4_src) { | |
2352 | err = -EINVAL; | |
f97c1e0c | 2353 | if (ipv4_is_multicast(oldflp->fl4_src) || |
1e637c74 | 2354 | ipv4_is_lbcast(oldflp->fl4_src) || |
f97c1e0c | 2355 | ipv4_is_zeronet(oldflp->fl4_src)) |
1da177e4 LT |
2356 | goto out; |
2357 | ||
2358 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ | |
b40afd0e | 2359 | dev_out = ip_dev_find(net, oldflp->fl4_src); |
f6c5d736 | 2360 | if (dev_out == NULL) |
1da177e4 LT |
2361 | goto out; |
2362 | ||
2363 | /* I removed check for oif == dev_out->oif here. | |
2364 | It was wrong for two reasons: | |
1ab35276 DL |
2365 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2366 | is assigned to multiple interfaces. | |
1da177e4 LT |
2367 | 2. Moreover, we are allowed to send packets with saddr |
2368 | of another iface. --ANK | |
2369 | */ | |
2370 | ||
f6c5d736 | 2371 | if (oldflp->oif == 0 |
f97c1e0c JP |
2372 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
2373 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { | |
1da177e4 LT |
2374 | /* Special hack: user can direct multicasts |
2375 | and limited broadcast via necessary interface | |
2376 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2377 | This hack is not just for fun, it allows | |
2378 | vic,vat and friends to work. | |
2379 | They bind socket to loopback, set ttl to zero | |
2380 | and expect that it will work. | |
2381 | From the viewpoint of routing cache they are broken, | |
2382 | because we are not allowed to build multicast path | |
2383 | with loopback source addr (look, routing cache | |
2384 | cannot know, that ttl is zero, so that packet | |
2385 | will not leave this host and route is valid). | |
2386 | Luckily, this hack is good workaround. | |
2387 | */ | |
2388 | ||
2389 | fl.oif = dev_out->ifindex; | |
2390 | goto make_route; | |
2391 | } | |
2392 | if (dev_out) | |
2393 | dev_put(dev_out); | |
2394 | dev_out = NULL; | |
2395 | } | |
2396 | ||
2397 | ||
2398 | if (oldflp->oif) { | |
b40afd0e | 2399 | dev_out = dev_get_by_index(net, oldflp->oif); |
1da177e4 LT |
2400 | err = -ENODEV; |
2401 | if (dev_out == NULL) | |
2402 | goto out; | |
e5ed6399 HX |
2403 | |
2404 | /* RACE: Check return value of inet_select_addr instead. */ | |
2405 | if (__in_dev_get_rtnl(dev_out) == NULL) { | |
1da177e4 LT |
2406 | dev_put(dev_out); |
2407 | goto out; /* Wrong error code */ | |
2408 | } | |
2409 | ||
f97c1e0c JP |
2410 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
2411 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { | |
1da177e4 LT |
2412 | if (!fl.fl4_src) |
2413 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2414 | RT_SCOPE_LINK); | |
2415 | goto make_route; | |
2416 | } | |
2417 | if (!fl.fl4_src) { | |
f97c1e0c | 2418 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
1da177e4 LT |
2419 | fl.fl4_src = inet_select_addr(dev_out, 0, |
2420 | fl.fl4_scope); | |
2421 | else if (!oldflp->fl4_dst) | |
2422 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2423 | RT_SCOPE_HOST); | |
2424 | } | |
2425 | } | |
2426 | ||
2427 | if (!fl.fl4_dst) { | |
2428 | fl.fl4_dst = fl.fl4_src; | |
2429 | if (!fl.fl4_dst) | |
2430 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); | |
2431 | if (dev_out) | |
2432 | dev_put(dev_out); | |
b40afd0e | 2433 | dev_out = net->loopback_dev; |
1da177e4 | 2434 | dev_hold(dev_out); |
b40afd0e | 2435 | fl.oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2436 | res.type = RTN_LOCAL; |
2437 | flags |= RTCF_LOCAL; | |
2438 | goto make_route; | |
2439 | } | |
2440 | ||
b40afd0e | 2441 | if (fib_lookup(net, &fl, &res)) { |
1da177e4 LT |
2442 | res.fi = NULL; |
2443 | if (oldflp->oif) { | |
2444 | /* Apparently, routing tables are wrong. Assume, | |
2445 | that the destination is on link. | |
2446 | ||
2447 | WHY? DW. | |
2448 | Because we are allowed to send to iface | |
2449 | even if it has NO routes and NO assigned | |
2450 | addresses. When oif is specified, routing | |
2451 | tables are looked up with only one purpose: | |
2452 | to catch if destination is gatewayed, rather than | |
2453 | direct. Moreover, if MSG_DONTROUTE is set, | |
2454 | we send packet, ignoring both routing tables | |
2455 | and ifaddr state. --ANK | |
2456 | ||
2457 | ||
2458 | We could make it even if oif is unknown, | |
2459 | likely IPv6, but we do not. | |
2460 | */ | |
2461 | ||
2462 | if (fl.fl4_src == 0) | |
2463 | fl.fl4_src = inet_select_addr(dev_out, 0, | |
2464 | RT_SCOPE_LINK); | |
2465 | res.type = RTN_UNICAST; | |
2466 | goto make_route; | |
2467 | } | |
2468 | if (dev_out) | |
2469 | dev_put(dev_out); | |
2470 | err = -ENETUNREACH; | |
2471 | goto out; | |
2472 | } | |
2473 | free_res = 1; | |
2474 | ||
2475 | if (res.type == RTN_LOCAL) { | |
2476 | if (!fl.fl4_src) | |
2477 | fl.fl4_src = fl.fl4_dst; | |
2478 | if (dev_out) | |
2479 | dev_put(dev_out); | |
b40afd0e | 2480 | dev_out = net->loopback_dev; |
1da177e4 LT |
2481 | dev_hold(dev_out); |
2482 | fl.oif = dev_out->ifindex; | |
2483 | if (res.fi) | |
2484 | fib_info_put(res.fi); | |
2485 | res.fi = NULL; | |
2486 | flags |= RTCF_LOCAL; | |
2487 | goto make_route; | |
2488 | } | |
2489 | ||
2490 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
2491 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
2492 | fib_select_multipath(&fl, &res); | |
2493 | else | |
2494 | #endif | |
2495 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) | |
b40afd0e | 2496 | fib_select_default(net, &fl, &res); |
1da177e4 LT |
2497 | |
2498 | if (!fl.fl4_src) | |
2499 | fl.fl4_src = FIB_RES_PREFSRC(res); | |
2500 | ||
2501 | if (dev_out) | |
2502 | dev_put(dev_out); | |
2503 | dev_out = FIB_RES_DEV(res); | |
2504 | dev_hold(dev_out); | |
2505 | fl.oif = dev_out->ifindex; | |
2506 | ||
2507 | ||
2508 | make_route: | |
2509 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); | |
2510 | ||
2511 | ||
2512 | if (free_res) | |
2513 | fib_res_put(&res); | |
2514 | if (dev_out) | |
2515 | dev_put(dev_out); | |
2516 | out: return err; | |
2517 | } | |
2518 | ||
611c183e DL |
2519 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
2520 | const struct flowi *flp) | |
1da177e4 LT |
2521 | { |
2522 | unsigned hash; | |
2523 | struct rtable *rth; | |
2524 | ||
e84f84f2 | 2525 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif, rt_genid(net)); |
1da177e4 LT |
2526 | |
2527 | rcu_read_lock_bh(); | |
2528 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; | |
093c2ca4 | 2529 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
1da177e4 LT |
2530 | if (rth->fl.fl4_dst == flp->fl4_dst && |
2531 | rth->fl.fl4_src == flp->fl4_src && | |
2532 | rth->fl.iif == 0 && | |
2533 | rth->fl.oif == flp->oif && | |
47dcf0cb | 2534 | rth->fl.mark == flp->mark && |
1da177e4 | 2535 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
b5921910 | 2536 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
878628fb | 2537 | net_eq(dev_net(rth->u.dst.dev), net) && |
e84f84f2 | 2538 | !rt_is_expired(rth)) { |
03f49f34 | 2539 | dst_use(&rth->u.dst, jiffies); |
1da177e4 LT |
2540 | RT_CACHE_STAT_INC(out_hit); |
2541 | rcu_read_unlock_bh(); | |
2542 | *rp = rth; | |
2543 | return 0; | |
2544 | } | |
2545 | RT_CACHE_STAT_INC(out_hlist_search); | |
2546 | } | |
2547 | rcu_read_unlock_bh(); | |
2548 | ||
611c183e | 2549 | return ip_route_output_slow(net, rp, flp); |
1da177e4 LT |
2550 | } |
2551 | ||
d8c97a94 ACM |
2552 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2553 | ||
14e50e57 DM |
2554 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2555 | { | |
2556 | } | |
2557 | ||
2558 | static struct dst_ops ipv4_dst_blackhole_ops = { | |
2559 | .family = AF_INET, | |
2560 | .protocol = __constant_htons(ETH_P_IP), | |
2561 | .destroy = ipv4_dst_destroy, | |
2562 | .check = ipv4_dst_check, | |
2563 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, | |
2564 | .entry_size = sizeof(struct rtable), | |
e2422970 | 2565 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
2566 | }; |
2567 | ||
2568 | ||
e84f84f2 | 2569 | static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi *flp) |
14e50e57 DM |
2570 | { |
2571 | struct rtable *ort = *rp; | |
2572 | struct rtable *rt = (struct rtable *) | |
2573 | dst_alloc(&ipv4_dst_blackhole_ops); | |
2574 | ||
2575 | if (rt) { | |
2576 | struct dst_entry *new = &rt->u.dst; | |
2577 | ||
2578 | atomic_set(&new->__refcnt, 1); | |
2579 | new->__use = 1; | |
352e512c HX |
2580 | new->input = dst_discard; |
2581 | new->output = dst_discard; | |
14e50e57 DM |
2582 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
2583 | ||
2584 | new->dev = ort->u.dst.dev; | |
2585 | if (new->dev) | |
2586 | dev_hold(new->dev); | |
2587 | ||
2588 | rt->fl = ort->fl; | |
2589 | ||
2590 | rt->idev = ort->idev; | |
2591 | if (rt->idev) | |
2592 | in_dev_hold(rt->idev); | |
e84f84f2 | 2593 | rt->rt_genid = rt_genid(net); |
14e50e57 DM |
2594 | rt->rt_flags = ort->rt_flags; |
2595 | rt->rt_type = ort->rt_type; | |
2596 | rt->rt_dst = ort->rt_dst; | |
2597 | rt->rt_src = ort->rt_src; | |
2598 | rt->rt_iif = ort->rt_iif; | |
2599 | rt->rt_gateway = ort->rt_gateway; | |
2600 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2601 | rt->peer = ort->peer; | |
2602 | if (rt->peer) | |
2603 | atomic_inc(&rt->peer->refcnt); | |
2604 | ||
2605 | dst_free(new); | |
2606 | } | |
2607 | ||
2608 | dst_release(&(*rp)->u.dst); | |
2609 | *rp = rt; | |
2610 | return (rt ? 0 : -ENOMEM); | |
2611 | } | |
2612 | ||
f1b050bf DL |
2613 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
2614 | struct sock *sk, int flags) | |
1da177e4 LT |
2615 | { |
2616 | int err; | |
2617 | ||
f1b050bf | 2618 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
1da177e4 LT |
2619 | return err; |
2620 | ||
2621 | if (flp->proto) { | |
2622 | if (!flp->fl4_src) | |
2623 | flp->fl4_src = (*rp)->rt_src; | |
2624 | if (!flp->fl4_dst) | |
2625 | flp->fl4_dst = (*rp)->rt_dst; | |
bb72845e HX |
2626 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, |
2627 | flags ? XFRM_LOOKUP_WAIT : 0); | |
14e50e57 | 2628 | if (err == -EREMOTE) |
e84f84f2 | 2629 | err = ipv4_dst_blackhole(net, rp, flp); |
14e50e57 DM |
2630 | |
2631 | return err; | |
1da177e4 LT |
2632 | } |
2633 | ||
2634 | return 0; | |
2635 | } | |
2636 | ||
d8c97a94 ACM |
2637 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2638 | ||
f206351a | 2639 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
1da177e4 | 2640 | { |
f206351a | 2641 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
1da177e4 LT |
2642 | } |
2643 | ||
2644 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2645 | int nowait, unsigned int flags) |
1da177e4 | 2646 | { |
ee6b9673 | 2647 | struct rtable *rt = skb->rtable; |
1da177e4 | 2648 | struct rtmsg *r; |
be403ea1 | 2649 | struct nlmsghdr *nlh; |
e3703b3d TG |
2650 | long expires; |
2651 | u32 id = 0, ts = 0, tsage = 0, error; | |
be403ea1 TG |
2652 | |
2653 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2654 | if (nlh == NULL) | |
26932566 | 2655 | return -EMSGSIZE; |
be403ea1 TG |
2656 | |
2657 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2658 | r->rtm_family = AF_INET; |
2659 | r->rtm_dst_len = 32; | |
2660 | r->rtm_src_len = 0; | |
2661 | r->rtm_tos = rt->fl.fl4_tos; | |
2662 | r->rtm_table = RT_TABLE_MAIN; | |
be403ea1 | 2663 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2664 | r->rtm_type = rt->rt_type; |
2665 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2666 | r->rtm_protocol = RTPROT_UNSPEC; | |
2667 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2668 | if (rt->rt_flags & RTCF_NOTIFY) | |
2669 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2670 | |
17fb2c64 | 2671 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2672 | |
1da177e4 LT |
2673 | if (rt->fl.fl4_src) { |
2674 | r->rtm_src_len = 32; | |
17fb2c64 | 2675 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
1da177e4 LT |
2676 | } |
2677 | if (rt->u.dst.dev) | |
be403ea1 | 2678 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
1da177e4 LT |
2679 | #ifdef CONFIG_NET_CLS_ROUTE |
2680 | if (rt->u.dst.tclassid) | |
be403ea1 | 2681 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
1da177e4 LT |
2682 | #endif |
2683 | if (rt->fl.iif) | |
17fb2c64 | 2684 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
1da177e4 | 2685 | else if (rt->rt_src != rt->fl.fl4_src) |
17fb2c64 | 2686 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2687 | |
1da177e4 | 2688 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2689 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2690 | |
1da177e4 | 2691 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
be403ea1 TG |
2692 | goto nla_put_failure; |
2693 | ||
e3703b3d TG |
2694 | error = rt->u.dst.error; |
2695 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; | |
1da177e4 | 2696 | if (rt->peer) { |
e3703b3d | 2697 | id = rt->peer->ip_id_count; |
1da177e4 | 2698 | if (rt->peer->tcp_ts_stamp) { |
e3703b3d | 2699 | ts = rt->peer->tcp_ts; |
9d729f72 | 2700 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
1da177e4 LT |
2701 | } |
2702 | } | |
be403ea1 | 2703 | |
1da177e4 LT |
2704 | if (rt->fl.iif) { |
2705 | #ifdef CONFIG_IP_MROUTE | |
e448515c | 2706 | __be32 dst = rt->rt_dst; |
1da177e4 | 2707 | |
f97c1e0c | 2708 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
586f1211 | 2709 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
1da177e4 LT |
2710 | int err = ipmr_get_route(skb, r, nowait); |
2711 | if (err <= 0) { | |
2712 | if (!nowait) { | |
2713 | if (err == 0) | |
2714 | return 0; | |
be403ea1 | 2715 | goto nla_put_failure; |
1da177e4 LT |
2716 | } else { |
2717 | if (err == -EMSGSIZE) | |
be403ea1 | 2718 | goto nla_put_failure; |
e3703b3d | 2719 | error = err; |
1da177e4 LT |
2720 | } |
2721 | } | |
2722 | } else | |
2723 | #endif | |
be403ea1 | 2724 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
1da177e4 LT |
2725 | } |
2726 | ||
e3703b3d TG |
2727 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
2728 | expires, error) < 0) | |
2729 | goto nla_put_failure; | |
be403ea1 TG |
2730 | |
2731 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2732 | |
be403ea1 | 2733 | nla_put_failure: |
26932566 PM |
2734 | nlmsg_cancel(skb, nlh); |
2735 | return -EMSGSIZE; | |
1da177e4 LT |
2736 | } |
2737 | ||
63f3444f | 2738 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2739 | { |
3b1e0a65 | 2740 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2741 | struct rtmsg *rtm; |
2742 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2743 | struct rtable *rt = NULL; |
9e12bb22 AV |
2744 | __be32 dst = 0; |
2745 | __be32 src = 0; | |
2746 | u32 iif; | |
d889ce3b | 2747 | int err; |
1da177e4 LT |
2748 | struct sk_buff *skb; |
2749 | ||
d889ce3b TG |
2750 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2751 | if (err < 0) | |
2752 | goto errout; | |
2753 | ||
2754 | rtm = nlmsg_data(nlh); | |
2755 | ||
1da177e4 | 2756 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2757 | if (skb == NULL) { |
2758 | err = -ENOBUFS; | |
2759 | goto errout; | |
2760 | } | |
1da177e4 LT |
2761 | |
2762 | /* Reserve room for dummy headers, this skb can pass | |
2763 | through good chunk of routing engine. | |
2764 | */ | |
459a98ed | 2765 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2766 | skb_reset_network_header(skb); |
d2c962b8 SH |
2767 | |
2768 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2769 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2770 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2771 | ||
17fb2c64 AV |
2772 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2773 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2774 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
1da177e4 LT |
2775 | |
2776 | if (iif) { | |
d889ce3b TG |
2777 | struct net_device *dev; |
2778 | ||
1937504d | 2779 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2780 | if (dev == NULL) { |
2781 | err = -ENODEV; | |
2782 | goto errout_free; | |
2783 | } | |
2784 | ||
1da177e4 LT |
2785 | skb->protocol = htons(ETH_P_IP); |
2786 | skb->dev = dev; | |
2787 | local_bh_disable(); | |
2788 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2789 | local_bh_enable(); | |
d889ce3b | 2790 | |
ee6b9673 | 2791 | rt = skb->rtable; |
d889ce3b | 2792 | if (err == 0 && rt->u.dst.error) |
1da177e4 LT |
2793 | err = -rt->u.dst.error; |
2794 | } else { | |
d889ce3b TG |
2795 | struct flowi fl = { |
2796 | .nl_u = { | |
2797 | .ip4_u = { | |
2798 | .daddr = dst, | |
2799 | .saddr = src, | |
2800 | .tos = rtm->rtm_tos, | |
2801 | }, | |
2802 | }, | |
2803 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2804 | }; | |
1937504d | 2805 | err = ip_route_output_key(net, &rt, &fl); |
1da177e4 | 2806 | } |
d889ce3b | 2807 | |
1da177e4 | 2808 | if (err) |
d889ce3b | 2809 | goto errout_free; |
1da177e4 | 2810 | |
ee6b9673 | 2811 | skb->rtable = rt; |
1da177e4 LT |
2812 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2813 | rt->rt_flags |= RTCF_NOTIFY; | |
2814 | ||
1da177e4 | 2815 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2816 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2817 | if (err <= 0) |
2818 | goto errout_free; | |
1da177e4 | 2819 | |
1937504d | 2820 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2821 | errout: |
2942e900 | 2822 | return err; |
1da177e4 | 2823 | |
d889ce3b | 2824 | errout_free: |
1da177e4 | 2825 | kfree_skb(skb); |
d889ce3b | 2826 | goto errout; |
1da177e4 LT |
2827 | } |
2828 | ||
2829 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2830 | { | |
2831 | struct rtable *rt; | |
2832 | int h, s_h; | |
2833 | int idx, s_idx; | |
1937504d DL |
2834 | struct net *net; |
2835 | ||
3b1e0a65 | 2836 | net = sock_net(skb->sk); |
1da177e4 LT |
2837 | |
2838 | s_h = cb->args[0]; | |
d8c92830 ED |
2839 | if (s_h < 0) |
2840 | s_h = 0; | |
1da177e4 | 2841 | s_idx = idx = cb->args[1]; |
d8c92830 | 2842 | for (h = s_h; h <= rt_hash_mask; h++) { |
1da177e4 LT |
2843 | rcu_read_lock_bh(); |
2844 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; | |
093c2ca4 | 2845 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
878628fb | 2846 | if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx) |
1da177e4 | 2847 | continue; |
e84f84f2 | 2848 | if (rt_is_expired(rt)) |
29e75252 | 2849 | continue; |
1da177e4 LT |
2850 | skb->dst = dst_clone(&rt->u.dst); |
2851 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
e905a9ed | 2852 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 2853 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
2854 | dst_release(xchg(&skb->dst, NULL)); |
2855 | rcu_read_unlock_bh(); | |
2856 | goto done; | |
2857 | } | |
2858 | dst_release(xchg(&skb->dst, NULL)); | |
2859 | } | |
2860 | rcu_read_unlock_bh(); | |
d8c92830 | 2861 | s_idx = 0; |
1da177e4 LT |
2862 | } |
2863 | ||
2864 | done: | |
2865 | cb->args[0] = h; | |
2866 | cb->args[1] = idx; | |
2867 | return skb->len; | |
2868 | } | |
2869 | ||
2870 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2871 | { | |
76e6ebfb | 2872 | rt_cache_flush(dev_net(in_dev->dev), 0); |
1da177e4 LT |
2873 | } |
2874 | ||
2875 | #ifdef CONFIG_SYSCTL | |
81c684d1 | 2876 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
1da177e4 LT |
2877 | struct file *filp, void __user *buffer, |
2878 | size_t *lenp, loff_t *ppos) | |
2879 | { | |
2880 | if (write) { | |
639e104f | 2881 | int flush_delay; |
81c684d1 | 2882 | ctl_table ctl; |
39a23e75 | 2883 | struct net *net; |
639e104f | 2884 | |
81c684d1 DL |
2885 | memcpy(&ctl, __ctl, sizeof(ctl)); |
2886 | ctl.data = &flush_delay; | |
2887 | proc_dointvec(&ctl, write, filp, buffer, lenp, ppos); | |
639e104f | 2888 | |
81c684d1 | 2889 | net = (struct net *)__ctl->extra1; |
39a23e75 | 2890 | rt_cache_flush(net, flush_delay); |
1da177e4 | 2891 | return 0; |
e905a9ed | 2892 | } |
1da177e4 LT |
2893 | |
2894 | return -EINVAL; | |
2895 | } | |
2896 | ||
2897 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, | |
2898 | int __user *name, | |
2899 | int nlen, | |
2900 | void __user *oldval, | |
2901 | size_t __user *oldlenp, | |
2902 | void __user *newval, | |
1f29bcd7 | 2903 | size_t newlen) |
1da177e4 LT |
2904 | { |
2905 | int delay; | |
39a23e75 | 2906 | struct net *net; |
1da177e4 LT |
2907 | if (newlen != sizeof(int)) |
2908 | return -EINVAL; | |
2909 | if (get_user(delay, (int __user *)newval)) | |
e905a9ed | 2910 | return -EFAULT; |
39a23e75 DL |
2911 | net = (struct net *)table->extra1; |
2912 | rt_cache_flush(net, delay); | |
1da177e4 LT |
2913 | return 0; |
2914 | } | |
2915 | ||
2916 | ctl_table ipv4_route_table[] = { | |
1da177e4 LT |
2917 | { |
2918 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, | |
2919 | .procname = "gc_thresh", | |
2920 | .data = &ipv4_dst_ops.gc_thresh, | |
2921 | .maxlen = sizeof(int), | |
2922 | .mode = 0644, | |
2923 | .proc_handler = &proc_dointvec, | |
2924 | }, | |
2925 | { | |
2926 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, | |
2927 | .procname = "max_size", | |
2928 | .data = &ip_rt_max_size, | |
2929 | .maxlen = sizeof(int), | |
2930 | .mode = 0644, | |
2931 | .proc_handler = &proc_dointvec, | |
2932 | }, | |
2933 | { | |
2934 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2935 | |
1da177e4 LT |
2936 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
2937 | .procname = "gc_min_interval", | |
2938 | .data = &ip_rt_gc_min_interval, | |
2939 | .maxlen = sizeof(int), | |
2940 | .mode = 0644, | |
2941 | .proc_handler = &proc_dointvec_jiffies, | |
2942 | .strategy = &sysctl_jiffies, | |
2943 | }, | |
2944 | { | |
2945 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, | |
2946 | .procname = "gc_min_interval_ms", | |
2947 | .data = &ip_rt_gc_min_interval, | |
2948 | .maxlen = sizeof(int), | |
2949 | .mode = 0644, | |
2950 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2951 | .strategy = &sysctl_ms_jiffies, | |
2952 | }, | |
2953 | { | |
2954 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, | |
2955 | .procname = "gc_timeout", | |
2956 | .data = &ip_rt_gc_timeout, | |
2957 | .maxlen = sizeof(int), | |
2958 | .mode = 0644, | |
2959 | .proc_handler = &proc_dointvec_jiffies, | |
2960 | .strategy = &sysctl_jiffies, | |
2961 | }, | |
2962 | { | |
2963 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, | |
2964 | .procname = "gc_interval", | |
2965 | .data = &ip_rt_gc_interval, | |
2966 | .maxlen = sizeof(int), | |
2967 | .mode = 0644, | |
2968 | .proc_handler = &proc_dointvec_jiffies, | |
2969 | .strategy = &sysctl_jiffies, | |
2970 | }, | |
2971 | { | |
2972 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, | |
2973 | .procname = "redirect_load", | |
2974 | .data = &ip_rt_redirect_load, | |
2975 | .maxlen = sizeof(int), | |
2976 | .mode = 0644, | |
2977 | .proc_handler = &proc_dointvec, | |
2978 | }, | |
2979 | { | |
2980 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, | |
2981 | .procname = "redirect_number", | |
2982 | .data = &ip_rt_redirect_number, | |
2983 | .maxlen = sizeof(int), | |
2984 | .mode = 0644, | |
2985 | .proc_handler = &proc_dointvec, | |
2986 | }, | |
2987 | { | |
2988 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, | |
2989 | .procname = "redirect_silence", | |
2990 | .data = &ip_rt_redirect_silence, | |
2991 | .maxlen = sizeof(int), | |
2992 | .mode = 0644, | |
2993 | .proc_handler = &proc_dointvec, | |
2994 | }, | |
2995 | { | |
2996 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, | |
2997 | .procname = "error_cost", | |
2998 | .data = &ip_rt_error_cost, | |
2999 | .maxlen = sizeof(int), | |
3000 | .mode = 0644, | |
3001 | .proc_handler = &proc_dointvec, | |
3002 | }, | |
3003 | { | |
3004 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, | |
3005 | .procname = "error_burst", | |
3006 | .data = &ip_rt_error_burst, | |
3007 | .maxlen = sizeof(int), | |
3008 | .mode = 0644, | |
3009 | .proc_handler = &proc_dointvec, | |
3010 | }, | |
3011 | { | |
3012 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, | |
3013 | .procname = "gc_elasticity", | |
3014 | .data = &ip_rt_gc_elasticity, | |
3015 | .maxlen = sizeof(int), | |
3016 | .mode = 0644, | |
3017 | .proc_handler = &proc_dointvec, | |
3018 | }, | |
3019 | { | |
3020 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, | |
3021 | .procname = "mtu_expires", | |
3022 | .data = &ip_rt_mtu_expires, | |
3023 | .maxlen = sizeof(int), | |
3024 | .mode = 0644, | |
3025 | .proc_handler = &proc_dointvec_jiffies, | |
3026 | .strategy = &sysctl_jiffies, | |
3027 | }, | |
3028 | { | |
3029 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, | |
3030 | .procname = "min_pmtu", | |
3031 | .data = &ip_rt_min_pmtu, | |
3032 | .maxlen = sizeof(int), | |
3033 | .mode = 0644, | |
3034 | .proc_handler = &proc_dointvec, | |
3035 | }, | |
3036 | { | |
3037 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, | |
3038 | .procname = "min_adv_mss", | |
3039 | .data = &ip_rt_min_advmss, | |
3040 | .maxlen = sizeof(int), | |
3041 | .mode = 0644, | |
3042 | .proc_handler = &proc_dointvec, | |
3043 | }, | |
3044 | { | |
3045 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, | |
3046 | .procname = "secret_interval", | |
3047 | .data = &ip_rt_secret_interval, | |
3048 | .maxlen = sizeof(int), | |
3049 | .mode = 0644, | |
3050 | .proc_handler = &proc_dointvec_jiffies, | |
3051 | .strategy = &sysctl_jiffies, | |
3052 | }, | |
3053 | { .ctl_name = 0 } | |
3054 | }; | |
39a23e75 DL |
3055 | |
3056 | static __net_initdata struct ctl_path ipv4_route_path[] = { | |
3057 | { .procname = "net", .ctl_name = CTL_NET, }, | |
3058 | { .procname = "ipv4", .ctl_name = NET_IPV4, }, | |
3059 | { .procname = "route", .ctl_name = NET_IPV4_ROUTE, }, | |
3060 | { }, | |
3061 | }; | |
3062 | ||
3063 | ||
3064 | static struct ctl_table ipv4_route_flush_table[] = { | |
3065 | { | |
3066 | .ctl_name = NET_IPV4_ROUTE_FLUSH, | |
3067 | .procname = "flush", | |
3068 | .maxlen = sizeof(int), | |
3069 | .mode = 0200, | |
3070 | .proc_handler = &ipv4_sysctl_rtcache_flush, | |
3071 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, | |
3072 | }, | |
3073 | { .ctl_name = 0 }, | |
3074 | }; | |
3075 | ||
3076 | static __net_init int sysctl_route_net_init(struct net *net) | |
3077 | { | |
3078 | struct ctl_table *tbl; | |
3079 | ||
3080 | tbl = ipv4_route_flush_table; | |
3081 | if (net != &init_net) { | |
3082 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); | |
3083 | if (tbl == NULL) | |
3084 | goto err_dup; | |
3085 | } | |
3086 | tbl[0].extra1 = net; | |
3087 | ||
3088 | net->ipv4.route_hdr = | |
3089 | register_net_sysctl_table(net, ipv4_route_path, tbl); | |
3090 | if (net->ipv4.route_hdr == NULL) | |
3091 | goto err_reg; | |
3092 | return 0; | |
3093 | ||
3094 | err_reg: | |
3095 | if (tbl != ipv4_route_flush_table) | |
3096 | kfree(tbl); | |
3097 | err_dup: | |
3098 | return -ENOMEM; | |
3099 | } | |
3100 | ||
3101 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3102 | { | |
3103 | struct ctl_table *tbl; | |
3104 | ||
3105 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3106 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3107 | BUG_ON(tbl == ipv4_route_flush_table); | |
3108 | kfree(tbl); | |
3109 | } | |
3110 | ||
3111 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3112 | .init = sysctl_route_net_init, | |
3113 | .exit = sysctl_route_net_exit, | |
3114 | }; | |
1da177e4 LT |
3115 | #endif |
3116 | ||
9f5e97e5 DL |
3117 | |
3118 | static __net_init int rt_secret_timer_init(struct net *net) | |
3119 | { | |
e84f84f2 DL |
3120 | atomic_set(&net->ipv4.rt_genid, |
3121 | (int) ((num_physpages ^ (num_physpages>>8)) ^ | |
3122 | (jiffies ^ (jiffies >> 7)))); | |
3123 | ||
9f5e97e5 DL |
3124 | net->ipv4.rt_secret_timer.function = rt_secret_rebuild; |
3125 | net->ipv4.rt_secret_timer.data = (unsigned long)net; | |
3126 | init_timer_deferrable(&net->ipv4.rt_secret_timer); | |
3127 | ||
3128 | net->ipv4.rt_secret_timer.expires = | |
3129 | jiffies + net_random() % ip_rt_secret_interval + | |
3130 | ip_rt_secret_interval; | |
3131 | add_timer(&net->ipv4.rt_secret_timer); | |
3132 | return 0; | |
3133 | } | |
3134 | ||
3135 | static __net_exit void rt_secret_timer_exit(struct net *net) | |
3136 | { | |
3137 | del_timer_sync(&net->ipv4.rt_secret_timer); | |
3138 | } | |
3139 | ||
3140 | static __net_initdata struct pernet_operations rt_secret_timer_ops = { | |
3141 | .init = rt_secret_timer_init, | |
3142 | .exit = rt_secret_timer_exit, | |
3143 | }; | |
3144 | ||
3145 | ||
1da177e4 | 3146 | #ifdef CONFIG_NET_CLS_ROUTE |
8dbde28d | 3147 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
1da177e4 LT |
3148 | #endif /* CONFIG_NET_CLS_ROUTE */ |
3149 | ||
3150 | static __initdata unsigned long rhash_entries; | |
3151 | static int __init set_rhash_entries(char *str) | |
3152 | { | |
3153 | if (!str) | |
3154 | return 0; | |
3155 | rhash_entries = simple_strtoul(str, &str, 0); | |
3156 | return 1; | |
3157 | } | |
3158 | __setup("rhash_entries=", set_rhash_entries); | |
3159 | ||
3160 | int __init ip_rt_init(void) | |
3161 | { | |
424c4b70 | 3162 | int rc = 0; |
1da177e4 | 3163 | |
1da177e4 | 3164 | #ifdef CONFIG_NET_CLS_ROUTE |
8dbde28d | 3165 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
1da177e4 LT |
3166 | if (!ip_rt_acct) |
3167 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3168 | #endif |
3169 | ||
e5d679f3 AD |
3170 | ipv4_dst_ops.kmem_cachep = |
3171 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3172 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3173 | |
14e50e57 DM |
3174 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3175 | ||
424c4b70 ED |
3176 | rt_hash_table = (struct rt_hash_bucket *) |
3177 | alloc_large_system_hash("IP route cache", | |
3178 | sizeof(struct rt_hash_bucket), | |
3179 | rhash_entries, | |
3180 | (num_physpages >= 128 * 1024) ? | |
18955cfc | 3181 | 15 : 17, |
8d1502de | 3182 | 0, |
424c4b70 ED |
3183 | &rt_hash_log, |
3184 | &rt_hash_mask, | |
3185 | 0); | |
22c047cc ED |
3186 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3187 | rt_hash_lock_init(); | |
1da177e4 LT |
3188 | |
3189 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3190 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3191 | ||
1da177e4 LT |
3192 | devinet_init(); |
3193 | ip_fib_init(); | |
3194 | ||
1da177e4 LT |
3195 | /* All the timers, started at system startup tend |
3196 | to synchronize. Perturb it a bit. | |
3197 | */ | |
39c90ece ED |
3198 | schedule_delayed_work(&expires_work, |
3199 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); | |
1da177e4 | 3200 | |
9f5e97e5 DL |
3201 | if (register_pernet_subsys(&rt_secret_timer_ops)) |
3202 | printk(KERN_ERR "Unable to setup rt_secret_timer\n"); | |
1da177e4 | 3203 | |
73b38711 | 3204 | if (ip_rt_proc_init()) |
107f1634 | 3205 | printk(KERN_ERR "Unable to create route proc files\n"); |
1da177e4 LT |
3206 | #ifdef CONFIG_XFRM |
3207 | xfrm_init(); | |
3208 | xfrm4_init(); | |
3209 | #endif | |
63f3444f TG |
3210 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
3211 | ||
39a23e75 DL |
3212 | #ifdef CONFIG_SYSCTL |
3213 | register_pernet_subsys(&sysctl_route_ops); | |
3214 | #endif | |
1da177e4 LT |
3215 | return rc; |
3216 | } | |
3217 | ||
3218 | EXPORT_SYMBOL(__ip_select_ident); | |
3219 | EXPORT_SYMBOL(ip_route_input); | |
3220 | EXPORT_SYMBOL(ip_route_output_key); |