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