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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * ROUTE - implementation of the IP router. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
1da177e4 LT |
65 | #include <linux/module.h> |
66 | #include <asm/uaccess.h> | |
67 | #include <asm/system.h> | |
68 | #include <linux/bitops.h> | |
69 | #include <linux/types.h> | |
70 | #include <linux/kernel.h> | |
1da177e4 | 71 | #include <linux/mm.h> |
424c4b70 | 72 | #include <linux/bootmem.h> |
1da177e4 LT |
73 | #include <linux/string.h> |
74 | #include <linux/socket.h> | |
75 | #include <linux/sockios.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/in.h> | |
78 | #include <linux/inet.h> | |
79 | #include <linux/netdevice.h> | |
80 | #include <linux/proc_fs.h> | |
81 | #include <linux/init.h> | |
39c90ece | 82 | #include <linux/workqueue.h> |
1da177e4 | 83 | #include <linux/skbuff.h> |
1da177e4 LT |
84 | #include <linux/inetdevice.h> |
85 | #include <linux/igmp.h> | |
86 | #include <linux/pkt_sched.h> | |
87 | #include <linux/mroute.h> | |
88 | #include <linux/netfilter_ipv4.h> | |
89 | #include <linux/random.h> | |
90 | #include <linux/jhash.h> | |
91 | #include <linux/rcupdate.h> | |
92 | #include <linux/times.h> | |
5a0e3ad6 | 93 | #include <linux/slab.h> |
352e512c | 94 | #include <net/dst.h> |
457c4cbc | 95 | #include <net/net_namespace.h> |
1da177e4 LT |
96 | #include <net/protocol.h> |
97 | #include <net/ip.h> | |
98 | #include <net/route.h> | |
99 | #include <net/inetpeer.h> | |
100 | #include <net/sock.h> | |
101 | #include <net/ip_fib.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/tcp.h> | |
104 | #include <net/icmp.h> | |
105 | #include <net/xfrm.h> | |
8d71740c | 106 | #include <net/netevent.h> |
63f3444f | 107 | #include <net/rtnetlink.h> |
1da177e4 LT |
108 | #ifdef CONFIG_SYSCTL |
109 | #include <linux/sysctl.h> | |
110 | #endif | |
111 | ||
68a5e3dd DM |
112 | #define RT_FL_TOS(oldflp4) \ |
113 | ((u32)(oldflp4->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) | |
1da177e4 LT |
114 | |
115 | #define IP_MAX_MTU 0xFFF0 | |
116 | ||
117 | #define RT_GC_TIMEOUT (300*HZ) | |
118 | ||
1da177e4 | 119 | static int ip_rt_max_size; |
817bc4db SH |
120 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
121 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; | |
122 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
123 | static int ip_rt_redirect_number __read_mostly = 9; | |
124 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
125 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
126 | static int ip_rt_error_cost __read_mostly = HZ; | |
127 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
128 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
129 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; | |
130 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
131 | static int ip_rt_min_advmss __read_mostly = 256; | |
1080d709 | 132 | static int rt_chain_length_max __read_mostly = 20; |
1da177e4 | 133 | |
1da177e4 LT |
134 | /* |
135 | * Interface to generic destination cache. | |
136 | */ | |
137 | ||
138 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 139 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
d33e4553 | 140 | static unsigned int ipv4_default_mtu(const struct dst_entry *dst); |
1da177e4 | 141 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 LT |
142 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
143 | static void ipv4_link_failure(struct sk_buff *skb); | |
144 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
569d3645 | 145 | static int rt_garbage_collect(struct dst_ops *ops); |
1da177e4 | 146 | |
72cdd1d9 ED |
147 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
148 | int how) | |
149 | { | |
150 | } | |
1da177e4 | 151 | |
62fa8a84 DM |
152 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
153 | { | |
06582540 DM |
154 | struct rtable *rt = (struct rtable *) dst; |
155 | struct inet_peer *peer; | |
156 | u32 *p = NULL; | |
157 | ||
158 | if (!rt->peer) | |
a48eff12 | 159 | rt_bind_peer(rt, rt->rt_dst, 1); |
62fa8a84 | 160 | |
06582540 DM |
161 | peer = rt->peer; |
162 | if (peer) { | |
62fa8a84 DM |
163 | u32 *old_p = __DST_METRICS_PTR(old); |
164 | unsigned long prev, new; | |
165 | ||
06582540 DM |
166 | p = peer->metrics; |
167 | if (inet_metrics_new(peer)) | |
168 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
62fa8a84 DM |
169 | |
170 | new = (unsigned long) p; | |
171 | prev = cmpxchg(&dst->_metrics, old, new); | |
172 | ||
173 | if (prev != old) { | |
62fa8a84 DM |
174 | p = __DST_METRICS_PTR(prev); |
175 | if (prev & DST_METRICS_READ_ONLY) | |
176 | p = NULL; | |
177 | } else { | |
62fa8a84 DM |
178 | if (rt->fi) { |
179 | fib_info_put(rt->fi); | |
180 | rt->fi = NULL; | |
181 | } | |
182 | } | |
183 | } | |
184 | return p; | |
185 | } | |
186 | ||
1da177e4 LT |
187 | static struct dst_ops ipv4_dst_ops = { |
188 | .family = AF_INET, | |
09640e63 | 189 | .protocol = cpu_to_be16(ETH_P_IP), |
1da177e4 LT |
190 | .gc = rt_garbage_collect, |
191 | .check = ipv4_dst_check, | |
0dbaee3b | 192 | .default_advmss = ipv4_default_advmss, |
d33e4553 | 193 | .default_mtu = ipv4_default_mtu, |
62fa8a84 | 194 | .cow_metrics = ipv4_cow_metrics, |
1da177e4 LT |
195 | .destroy = ipv4_dst_destroy, |
196 | .ifdown = ipv4_dst_ifdown, | |
197 | .negative_advice = ipv4_negative_advice, | |
198 | .link_failure = ipv4_link_failure, | |
199 | .update_pmtu = ip_rt_update_pmtu, | |
1ac06e03 | 200 | .local_out = __ip_local_out, |
1da177e4 LT |
201 | }; |
202 | ||
203 | #define ECN_OR_COST(class) TC_PRIO_##class | |
204 | ||
4839c52b | 205 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 206 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 207 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
208 | TC_PRIO_BESTEFFORT, |
209 | ECN_OR_COST(BESTEFFORT), | |
210 | TC_PRIO_BULK, | |
211 | ECN_OR_COST(BULK), | |
212 | TC_PRIO_BULK, | |
213 | ECN_OR_COST(BULK), | |
214 | TC_PRIO_INTERACTIVE, | |
215 | ECN_OR_COST(INTERACTIVE), | |
216 | TC_PRIO_INTERACTIVE, | |
217 | ECN_OR_COST(INTERACTIVE), | |
218 | TC_PRIO_INTERACTIVE_BULK, | |
219 | ECN_OR_COST(INTERACTIVE_BULK), | |
220 | TC_PRIO_INTERACTIVE_BULK, | |
221 | ECN_OR_COST(INTERACTIVE_BULK) | |
222 | }; | |
223 | ||
224 | ||
225 | /* | |
226 | * Route cache. | |
227 | */ | |
228 | ||
229 | /* The locking scheme is rather straight forward: | |
230 | * | |
231 | * 1) Read-Copy Update protects the buckets of the central route hash. | |
232 | * 2) Only writers remove entries, and they hold the lock | |
233 | * as they look at rtable reference counts. | |
234 | * 3) Only readers acquire references to rtable entries, | |
235 | * they do so with atomic increments and with the | |
236 | * lock held. | |
237 | */ | |
238 | ||
239 | struct rt_hash_bucket { | |
1c31720a | 240 | struct rtable __rcu *chain; |
22c047cc | 241 | }; |
1080d709 | 242 | |
8a25d5de IM |
243 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
244 | defined(CONFIG_PROVE_LOCKING) | |
22c047cc ED |
245 | /* |
246 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks | |
247 | * The size of this table is a power of two and depends on the number of CPUS. | |
62051200 | 248 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
22c047cc | 249 | */ |
62051200 IM |
250 | #ifdef CONFIG_LOCKDEP |
251 | # define RT_HASH_LOCK_SZ 256 | |
22c047cc | 252 | #else |
62051200 IM |
253 | # if NR_CPUS >= 32 |
254 | # define RT_HASH_LOCK_SZ 4096 | |
255 | # elif NR_CPUS >= 16 | |
256 | # define RT_HASH_LOCK_SZ 2048 | |
257 | # elif NR_CPUS >= 8 | |
258 | # define RT_HASH_LOCK_SZ 1024 | |
259 | # elif NR_CPUS >= 4 | |
260 | # define RT_HASH_LOCK_SZ 512 | |
261 | # else | |
262 | # define RT_HASH_LOCK_SZ 256 | |
263 | # endif | |
22c047cc ED |
264 | #endif |
265 | ||
266 | static spinlock_t *rt_hash_locks; | |
267 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] | |
1ff1cc20 PE |
268 | |
269 | static __init void rt_hash_lock_init(void) | |
270 | { | |
271 | int i; | |
272 | ||
273 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, | |
274 | GFP_KERNEL); | |
275 | if (!rt_hash_locks) | |
276 | panic("IP: failed to allocate rt_hash_locks\n"); | |
277 | ||
278 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) | |
279 | spin_lock_init(&rt_hash_locks[i]); | |
280 | } | |
22c047cc ED |
281 | #else |
282 | # define rt_hash_lock_addr(slot) NULL | |
1ff1cc20 PE |
283 | |
284 | static inline void rt_hash_lock_init(void) | |
285 | { | |
286 | } | |
22c047cc | 287 | #endif |
1da177e4 | 288 | |
817bc4db SH |
289 | static struct rt_hash_bucket *rt_hash_table __read_mostly; |
290 | static unsigned rt_hash_mask __read_mostly; | |
291 | static unsigned int rt_hash_log __read_mostly; | |
1da177e4 | 292 | |
2f970d83 | 293 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
27f39c73 | 294 | #define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field) |
1da177e4 | 295 | |
b00180de | 296 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, |
0eae88f3 | 297 | int genid) |
1da177e4 | 298 | { |
0eae88f3 | 299 | return jhash_3words((__force u32)daddr, (__force u32)saddr, |
b00180de | 300 | idx, genid) |
29e75252 | 301 | & rt_hash_mask; |
1da177e4 LT |
302 | } |
303 | ||
e84f84f2 DL |
304 | static inline int rt_genid(struct net *net) |
305 | { | |
306 | return atomic_read(&net->ipv4.rt_genid); | |
307 | } | |
308 | ||
1da177e4 LT |
309 | #ifdef CONFIG_PROC_FS |
310 | struct rt_cache_iter_state { | |
a75e936f | 311 | struct seq_net_private p; |
1da177e4 | 312 | int bucket; |
29e75252 | 313 | int genid; |
1da177e4 LT |
314 | }; |
315 | ||
1218854a | 316 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
1da177e4 | 317 | { |
1218854a | 318 | struct rt_cache_iter_state *st = seq->private; |
1da177e4 | 319 | struct rtable *r = NULL; |
1da177e4 LT |
320 | |
321 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { | |
1c31720a | 322 | if (!rcu_dereference_raw(rt_hash_table[st->bucket].chain)) |
a6272665 | 323 | continue; |
1da177e4 | 324 | rcu_read_lock_bh(); |
a898def2 | 325 | r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); |
29e75252 | 326 | while (r) { |
d8d1f30b | 327 | if (dev_net(r->dst.dev) == seq_file_net(seq) && |
a75e936f | 328 | r->rt_genid == st->genid) |
29e75252 | 329 | return r; |
d8d1f30b | 330 | r = rcu_dereference_bh(r->dst.rt_next); |
29e75252 | 331 | } |
1da177e4 LT |
332 | rcu_read_unlock_bh(); |
333 | } | |
29e75252 | 334 | return r; |
1da177e4 LT |
335 | } |
336 | ||
1218854a | 337 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
642d6318 | 338 | struct rtable *r) |
1da177e4 | 339 | { |
1218854a | 340 | struct rt_cache_iter_state *st = seq->private; |
a6272665 | 341 | |
1c31720a | 342 | r = rcu_dereference_bh(r->dst.rt_next); |
1da177e4 LT |
343 | while (!r) { |
344 | rcu_read_unlock_bh(); | |
a6272665 ED |
345 | do { |
346 | if (--st->bucket < 0) | |
347 | return NULL; | |
1c31720a | 348 | } while (!rcu_dereference_raw(rt_hash_table[st->bucket].chain)); |
1da177e4 | 349 | rcu_read_lock_bh(); |
1c31720a | 350 | r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); |
1da177e4 | 351 | } |
1c31720a | 352 | return r; |
1da177e4 LT |
353 | } |
354 | ||
1218854a | 355 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
642d6318 DL |
356 | struct rtable *r) |
357 | { | |
1218854a YH |
358 | struct rt_cache_iter_state *st = seq->private; |
359 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { | |
d8d1f30b | 360 | if (dev_net(r->dst.dev) != seq_file_net(seq)) |
a75e936f | 361 | continue; |
642d6318 DL |
362 | if (r->rt_genid == st->genid) |
363 | break; | |
364 | } | |
365 | return r; | |
366 | } | |
367 | ||
1218854a | 368 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 369 | { |
1218854a | 370 | struct rtable *r = rt_cache_get_first(seq); |
1da177e4 LT |
371 | |
372 | if (r) | |
1218854a | 373 | while (pos && (r = rt_cache_get_next(seq, r))) |
1da177e4 LT |
374 | --pos; |
375 | return pos ? NULL : r; | |
376 | } | |
377 | ||
378 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
379 | { | |
29e75252 | 380 | struct rt_cache_iter_state *st = seq->private; |
29e75252 | 381 | if (*pos) |
1218854a | 382 | return rt_cache_get_idx(seq, *pos - 1); |
e84f84f2 | 383 | st->genid = rt_genid(seq_file_net(seq)); |
29e75252 | 384 | return SEQ_START_TOKEN; |
1da177e4 LT |
385 | } |
386 | ||
387 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
388 | { | |
29e75252 | 389 | struct rtable *r; |
1da177e4 LT |
390 | |
391 | if (v == SEQ_START_TOKEN) | |
1218854a | 392 | r = rt_cache_get_first(seq); |
1da177e4 | 393 | else |
1218854a | 394 | r = rt_cache_get_next(seq, v); |
1da177e4 LT |
395 | ++*pos; |
396 | return r; | |
397 | } | |
398 | ||
399 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
400 | { | |
401 | if (v && v != SEQ_START_TOKEN) | |
402 | rcu_read_unlock_bh(); | |
403 | } | |
404 | ||
405 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
406 | { | |
407 | if (v == SEQ_START_TOKEN) | |
408 | seq_printf(seq, "%-127s\n", | |
409 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
410 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
411 | "HHUptod\tSpecDst"); | |
412 | else { | |
413 | struct rtable *r = v; | |
5e659e4c | 414 | int len; |
1da177e4 | 415 | |
0eae88f3 ED |
416 | seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t" |
417 | "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", | |
d8d1f30b | 418 | r->dst.dev ? r->dst.dev->name : "*", |
0eae88f3 ED |
419 | (__force u32)r->rt_dst, |
420 | (__force u32)r->rt_gateway, | |
d8d1f30b CG |
421 | r->rt_flags, atomic_read(&r->dst.__refcnt), |
422 | r->dst.__use, 0, (__force u32)r->rt_src, | |
0dbaee3b | 423 | dst_metric_advmss(&r->dst) + 40, |
d8d1f30b CG |
424 | dst_metric(&r->dst, RTAX_WINDOW), |
425 | (int)((dst_metric(&r->dst, RTAX_RTT) >> 3) + | |
426 | dst_metric(&r->dst, RTAX_RTTVAR)), | |
475949d8 | 427 | r->rt_key_tos, |
d8d1f30b CG |
428 | r->dst.hh ? atomic_read(&r->dst.hh->hh_refcnt) : -1, |
429 | r->dst.hh ? (r->dst.hh->hh_output == | |
1da177e4 | 430 | dev_queue_xmit) : 0, |
5e659e4c PE |
431 | r->rt_spec_dst, &len); |
432 | ||
433 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
e905a9ed YH |
434 | } |
435 | return 0; | |
1da177e4 LT |
436 | } |
437 | ||
f690808e | 438 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
439 | .start = rt_cache_seq_start, |
440 | .next = rt_cache_seq_next, | |
441 | .stop = rt_cache_seq_stop, | |
442 | .show = rt_cache_seq_show, | |
443 | }; | |
444 | ||
445 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
446 | { | |
a75e936f | 447 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
cf7732e4 | 448 | sizeof(struct rt_cache_iter_state)); |
1da177e4 LT |
449 | } |
450 | ||
9a32144e | 451 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
452 | .owner = THIS_MODULE, |
453 | .open = rt_cache_seq_open, | |
454 | .read = seq_read, | |
455 | .llseek = seq_lseek, | |
a75e936f | 456 | .release = seq_release_net, |
1da177e4 LT |
457 | }; |
458 | ||
459 | ||
460 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
461 | { | |
462 | int cpu; | |
463 | ||
464 | if (*pos == 0) | |
465 | return SEQ_START_TOKEN; | |
466 | ||
0f23174a | 467 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
468 | if (!cpu_possible(cpu)) |
469 | continue; | |
470 | *pos = cpu+1; | |
2f970d83 | 471 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
472 | } |
473 | return NULL; | |
474 | } | |
475 | ||
476 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
477 | { | |
478 | int cpu; | |
479 | ||
0f23174a | 480 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
481 | if (!cpu_possible(cpu)) |
482 | continue; | |
483 | *pos = cpu+1; | |
2f970d83 | 484 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
485 | } |
486 | return NULL; | |
e905a9ed | 487 | |
1da177e4 LT |
488 | } |
489 | ||
490 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
491 | { | |
492 | ||
493 | } | |
494 | ||
495 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
496 | { | |
497 | struct rt_cache_stat *st = v; | |
498 | ||
499 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 500 | 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 |
501 | return 0; |
502 | } | |
e905a9ed | 503 | |
1da177e4 LT |
504 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
505 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 506 | dst_entries_get_slow(&ipv4_dst_ops), |
1da177e4 LT |
507 | st->in_hit, |
508 | st->in_slow_tot, | |
509 | st->in_slow_mc, | |
510 | st->in_no_route, | |
511 | st->in_brd, | |
512 | st->in_martian_dst, | |
513 | st->in_martian_src, | |
514 | ||
515 | st->out_hit, | |
516 | st->out_slow_tot, | |
e905a9ed | 517 | st->out_slow_mc, |
1da177e4 LT |
518 | |
519 | st->gc_total, | |
520 | st->gc_ignored, | |
521 | st->gc_goal_miss, | |
522 | st->gc_dst_overflow, | |
523 | st->in_hlist_search, | |
524 | st->out_hlist_search | |
525 | ); | |
526 | return 0; | |
527 | } | |
528 | ||
f690808e | 529 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
530 | .start = rt_cpu_seq_start, |
531 | .next = rt_cpu_seq_next, | |
532 | .stop = rt_cpu_seq_stop, | |
533 | .show = rt_cpu_seq_show, | |
534 | }; | |
535 | ||
536 | ||
537 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
538 | { | |
539 | return seq_open(file, &rt_cpu_seq_ops); | |
540 | } | |
541 | ||
9a32144e | 542 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
543 | .owner = THIS_MODULE, |
544 | .open = rt_cpu_seq_open, | |
545 | .read = seq_read, | |
546 | .llseek = seq_lseek, | |
547 | .release = seq_release, | |
548 | }; | |
549 | ||
c7066f70 | 550 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 551 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 552 | { |
a661c419 AD |
553 | struct ip_rt_acct *dst, *src; |
554 | unsigned int i, j; | |
555 | ||
556 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
557 | if (!dst) | |
558 | return -ENOMEM; | |
559 | ||
560 | for_each_possible_cpu(i) { | |
561 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
562 | for (j = 0; j < 256; j++) { | |
563 | dst[j].o_bytes += src[j].o_bytes; | |
564 | dst[j].o_packets += src[j].o_packets; | |
565 | dst[j].i_bytes += src[j].i_bytes; | |
566 | dst[j].i_packets += src[j].i_packets; | |
567 | } | |
78c686e9 PE |
568 | } |
569 | ||
a661c419 AD |
570 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
571 | kfree(dst); | |
572 | return 0; | |
573 | } | |
78c686e9 | 574 | |
a661c419 AD |
575 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
576 | { | |
577 | return single_open(file, rt_acct_proc_show, NULL); | |
78c686e9 | 578 | } |
a661c419 AD |
579 | |
580 | static const struct file_operations rt_acct_proc_fops = { | |
581 | .owner = THIS_MODULE, | |
582 | .open = rt_acct_proc_open, | |
583 | .read = seq_read, | |
584 | .llseek = seq_lseek, | |
585 | .release = single_release, | |
586 | }; | |
78c686e9 | 587 | #endif |
107f1634 | 588 | |
73b38711 | 589 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
590 | { |
591 | struct proc_dir_entry *pde; | |
592 | ||
593 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
594 | &rt_cache_seq_fops); | |
595 | if (!pde) | |
596 | goto err1; | |
597 | ||
77020720 WC |
598 | pde = proc_create("rt_cache", S_IRUGO, |
599 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
600 | if (!pde) |
601 | goto err2; | |
602 | ||
c7066f70 | 603 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 604 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
107f1634 PE |
605 | if (!pde) |
606 | goto err3; | |
607 | #endif | |
608 | return 0; | |
609 | ||
c7066f70 | 610 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
611 | err3: |
612 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
613 | #endif | |
614 | err2: | |
615 | remove_proc_entry("rt_cache", net->proc_net); | |
616 | err1: | |
617 | return -ENOMEM; | |
618 | } | |
73b38711 DL |
619 | |
620 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
621 | { | |
622 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
623 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 624 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 625 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 626 | #endif |
73b38711 DL |
627 | } |
628 | ||
629 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
630 | .init = ip_rt_do_proc_init, | |
631 | .exit = ip_rt_do_proc_exit, | |
632 | }; | |
633 | ||
634 | static int __init ip_rt_proc_init(void) | |
635 | { | |
636 | return register_pernet_subsys(&ip_rt_proc_ops); | |
637 | } | |
638 | ||
107f1634 | 639 | #else |
73b38711 | 640 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
641 | { |
642 | return 0; | |
643 | } | |
1da177e4 | 644 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 645 | |
5969f71d | 646 | static inline void rt_free(struct rtable *rt) |
1da177e4 | 647 | { |
d8d1f30b | 648 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
649 | } |
650 | ||
5969f71d | 651 | static inline void rt_drop(struct rtable *rt) |
1da177e4 | 652 | { |
1da177e4 | 653 | ip_rt_put(rt); |
d8d1f30b | 654 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
655 | } |
656 | ||
5969f71d | 657 | static inline int rt_fast_clean(struct rtable *rth) |
1da177e4 LT |
658 | { |
659 | /* Kill broadcast/multicast entries very aggresively, if they | |
660 | collide in hash table with more useful entries */ | |
661 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && | |
c7537967 | 662 | rt_is_input_route(rth) && rth->dst.rt_next; |
1da177e4 LT |
663 | } |
664 | ||
5969f71d | 665 | static inline int rt_valuable(struct rtable *rth) |
1da177e4 LT |
666 | { |
667 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || | |
2c8cec5c | 668 | (rth->peer && rth->peer->pmtu_expires); |
1da177e4 LT |
669 | } |
670 | ||
671 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) | |
672 | { | |
673 | unsigned long age; | |
674 | int ret = 0; | |
675 | ||
d8d1f30b | 676 | if (atomic_read(&rth->dst.__refcnt)) |
1da177e4 LT |
677 | goto out; |
678 | ||
d8d1f30b | 679 | age = jiffies - rth->dst.lastuse; |
1da177e4 LT |
680 | if ((age <= tmo1 && !rt_fast_clean(rth)) || |
681 | (age <= tmo2 && rt_valuable(rth))) | |
682 | goto out; | |
683 | ret = 1; | |
684 | out: return ret; | |
685 | } | |
686 | ||
687 | /* Bits of score are: | |
688 | * 31: very valuable | |
689 | * 30: not quite useless | |
690 | * 29..0: usage counter | |
691 | */ | |
692 | static inline u32 rt_score(struct rtable *rt) | |
693 | { | |
d8d1f30b | 694 | u32 score = jiffies - rt->dst.lastuse; |
1da177e4 LT |
695 | |
696 | score = ~score & ~(3<<30); | |
697 | ||
698 | if (rt_valuable(rt)) | |
699 | score |= (1<<31); | |
700 | ||
c7537967 | 701 | if (rt_is_output_route(rt) || |
1da177e4 LT |
702 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) |
703 | score |= (1<<30); | |
704 | ||
705 | return score; | |
706 | } | |
707 | ||
1080d709 NH |
708 | static inline bool rt_caching(const struct net *net) |
709 | { | |
710 | return net->ipv4.current_rt_cache_rebuild_count <= | |
711 | net->ipv4.sysctl_rt_cache_rebuild_count; | |
712 | } | |
713 | ||
5e2b61f7 DM |
714 | static inline bool compare_hash_inputs(const struct rtable *rt1, |
715 | const struct rtable *rt2) | |
1080d709 | 716 | { |
5e2b61f7 DM |
717 | return ((((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) | |
718 | ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | | |
719 | (rt1->rt_iif ^ rt2->rt_iif)) == 0); | |
1080d709 NH |
720 | } |
721 | ||
5e2b61f7 | 722 | static inline int compare_keys(struct rtable *rt1, struct rtable *rt2) |
1da177e4 | 723 | { |
5e2b61f7 DM |
724 | return (((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) | |
725 | ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | | |
726 | (rt1->rt_mark ^ rt2->rt_mark) | | |
475949d8 | 727 | (rt1->rt_key_tos ^ rt2->rt_key_tos) | |
5e2b61f7 DM |
728 | (rt1->rt_oif ^ rt2->rt_oif) | |
729 | (rt1->rt_iif ^ rt2->rt_iif)) == 0; | |
1da177e4 LT |
730 | } |
731 | ||
b5921910 DL |
732 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
733 | { | |
d8d1f30b | 734 | return net_eq(dev_net(rt1->dst.dev), dev_net(rt2->dst.dev)); |
b5921910 DL |
735 | } |
736 | ||
e84f84f2 DL |
737 | static inline int rt_is_expired(struct rtable *rth) |
738 | { | |
d8d1f30b | 739 | return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); |
e84f84f2 DL |
740 | } |
741 | ||
beb659bd ED |
742 | /* |
743 | * Perform a full scan of hash table and free all entries. | |
744 | * Can be called by a softirq or a process. | |
745 | * In the later case, we want to be reschedule if necessary | |
746 | */ | |
6561a3b1 | 747 | static void rt_do_flush(struct net *net, int process_context) |
beb659bd ED |
748 | { |
749 | unsigned int i; | |
750 | struct rtable *rth, *next; | |
751 | ||
752 | for (i = 0; i <= rt_hash_mask; i++) { | |
6561a3b1 DM |
753 | struct rtable __rcu **pprev; |
754 | struct rtable *list; | |
755 | ||
beb659bd ED |
756 | if (process_context && need_resched()) |
757 | cond_resched(); | |
1c31720a | 758 | rth = rcu_dereference_raw(rt_hash_table[i].chain); |
beb659bd ED |
759 | if (!rth) |
760 | continue; | |
761 | ||
762 | spin_lock_bh(rt_hash_lock_addr(i)); | |
32cb5b4e | 763 | |
6561a3b1 DM |
764 | list = NULL; |
765 | pprev = &rt_hash_table[i].chain; | |
766 | rth = rcu_dereference_protected(*pprev, | |
1c31720a | 767 | lockdep_is_held(rt_hash_lock_addr(i))); |
32cb5b4e | 768 | |
6561a3b1 DM |
769 | while (rth) { |
770 | next = rcu_dereference_protected(rth->dst.rt_next, | |
1c31720a | 771 | lockdep_is_held(rt_hash_lock_addr(i))); |
6561a3b1 DM |
772 | |
773 | if (!net || | |
774 | net_eq(dev_net(rth->dst.dev), net)) { | |
775 | rcu_assign_pointer(*pprev, next); | |
776 | rcu_assign_pointer(rth->dst.rt_next, list); | |
777 | list = rth; | |
32cb5b4e | 778 | } else { |
6561a3b1 | 779 | pprev = &rth->dst.rt_next; |
32cb5b4e | 780 | } |
6561a3b1 | 781 | rth = next; |
32cb5b4e | 782 | } |
6561a3b1 | 783 | |
beb659bd ED |
784 | spin_unlock_bh(rt_hash_lock_addr(i)); |
785 | ||
6561a3b1 DM |
786 | for (; list; list = next) { |
787 | next = rcu_dereference_protected(list->dst.rt_next, 1); | |
788 | rt_free(list); | |
beb659bd ED |
789 | } |
790 | } | |
791 | } | |
792 | ||
1080d709 NH |
793 | /* |
794 | * While freeing expired entries, we compute average chain length | |
795 | * and standard deviation, using fixed-point arithmetic. | |
796 | * This to have an estimation of rt_chain_length_max | |
797 | * rt_chain_length_max = max(elasticity, AVG + 4*SD) | |
798 | * We use 3 bits for frational part, and 29 (or 61) for magnitude. | |
799 | */ | |
800 | ||
801 | #define FRACT_BITS 3 | |
802 | #define ONE (1UL << FRACT_BITS) | |
803 | ||
98376387 ED |
804 | /* |
805 | * Given a hash chain and an item in this hash chain, | |
806 | * find if a previous entry has the same hash_inputs | |
807 | * (but differs on tos, mark or oif) | |
808 | * Returns 0 if an alias is found. | |
809 | * Returns ONE if rth has no alias before itself. | |
810 | */ | |
811 | static int has_noalias(const struct rtable *head, const struct rtable *rth) | |
812 | { | |
813 | const struct rtable *aux = head; | |
814 | ||
815 | while (aux != rth) { | |
5e2b61f7 | 816 | if (compare_hash_inputs(aux, rth)) |
98376387 | 817 | return 0; |
1c31720a | 818 | aux = rcu_dereference_protected(aux->dst.rt_next, 1); |
98376387 ED |
819 | } |
820 | return ONE; | |
821 | } | |
822 | ||
29e75252 | 823 | /* |
25985edc | 824 | * Perturbation of rt_genid by a small quantity [1..256] |
29e75252 ED |
825 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() |
826 | * many times (2^24) without giving recent rt_genid. | |
827 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 828 | */ |
86c657f6 | 829 | static void rt_cache_invalidate(struct net *net) |
1da177e4 | 830 | { |
29e75252 | 831 | unsigned char shuffle; |
1da177e4 | 832 | |
29e75252 | 833 | get_random_bytes(&shuffle, sizeof(shuffle)); |
e84f84f2 | 834 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
1da177e4 LT |
835 | } |
836 | ||
29e75252 ED |
837 | /* |
838 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
839 | * delay >= 0 : invalidate & flush cache (can be long) | |
840 | */ | |
76e6ebfb | 841 | void rt_cache_flush(struct net *net, int delay) |
1da177e4 | 842 | { |
86c657f6 | 843 | rt_cache_invalidate(net); |
29e75252 | 844 | if (delay >= 0) |
6561a3b1 | 845 | rt_do_flush(net, !in_softirq()); |
1da177e4 LT |
846 | } |
847 | ||
a5ee1551 | 848 | /* Flush previous cache invalidated entries from the cache */ |
6561a3b1 | 849 | void rt_cache_flush_batch(struct net *net) |
a5ee1551 | 850 | { |
6561a3b1 | 851 | rt_do_flush(net, !in_softirq()); |
a5ee1551 EB |
852 | } |
853 | ||
1080d709 NH |
854 | static void rt_emergency_hash_rebuild(struct net *net) |
855 | { | |
3ee94372 | 856 | if (net_ratelimit()) |
1080d709 | 857 | printk(KERN_WARNING "Route hash chain too long!\n"); |
3ee94372 | 858 | rt_cache_invalidate(net); |
1080d709 NH |
859 | } |
860 | ||
1da177e4 LT |
861 | /* |
862 | Short description of GC goals. | |
863 | ||
864 | We want to build algorithm, which will keep routing cache | |
865 | at some equilibrium point, when number of aged off entries | |
866 | is kept approximately equal to newly generated ones. | |
867 | ||
868 | Current expiration strength is variable "expire". | |
869 | We try to adjust it dynamically, so that if networking | |
870 | is idle expires is large enough to keep enough of warm entries, | |
871 | and when load increases it reduces to limit cache size. | |
872 | */ | |
873 | ||
569d3645 | 874 | static int rt_garbage_collect(struct dst_ops *ops) |
1da177e4 LT |
875 | { |
876 | static unsigned long expire = RT_GC_TIMEOUT; | |
877 | static unsigned long last_gc; | |
878 | static int rover; | |
879 | static int equilibrium; | |
1c31720a ED |
880 | struct rtable *rth; |
881 | struct rtable __rcu **rthp; | |
1da177e4 LT |
882 | unsigned long now = jiffies; |
883 | int goal; | |
fc66f95c | 884 | int entries = dst_entries_get_fast(&ipv4_dst_ops); |
1da177e4 LT |
885 | |
886 | /* | |
887 | * Garbage collection is pretty expensive, | |
888 | * do not make it too frequently. | |
889 | */ | |
890 | ||
891 | RT_CACHE_STAT_INC(gc_total); | |
892 | ||
893 | if (now - last_gc < ip_rt_gc_min_interval && | |
fc66f95c | 894 | entries < ip_rt_max_size) { |
1da177e4 LT |
895 | RT_CACHE_STAT_INC(gc_ignored); |
896 | goto out; | |
897 | } | |
898 | ||
fc66f95c | 899 | entries = dst_entries_get_slow(&ipv4_dst_ops); |
1da177e4 | 900 | /* Calculate number of entries, which we want to expire now. */ |
fc66f95c | 901 | goal = entries - (ip_rt_gc_elasticity << rt_hash_log); |
1da177e4 LT |
902 | if (goal <= 0) { |
903 | if (equilibrium < ipv4_dst_ops.gc_thresh) | |
904 | equilibrium = ipv4_dst_ops.gc_thresh; | |
fc66f95c | 905 | goal = entries - equilibrium; |
1da177e4 | 906 | if (goal > 0) { |
b790cedd | 907 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
fc66f95c | 908 | goal = entries - equilibrium; |
1da177e4 LT |
909 | } |
910 | } else { | |
911 | /* We are in dangerous area. Try to reduce cache really | |
912 | * aggressively. | |
913 | */ | |
b790cedd | 914 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
fc66f95c | 915 | equilibrium = entries - goal; |
1da177e4 LT |
916 | } |
917 | ||
918 | if (now - last_gc >= ip_rt_gc_min_interval) | |
919 | last_gc = now; | |
920 | ||
921 | if (goal <= 0) { | |
922 | equilibrium += goal; | |
923 | goto work_done; | |
924 | } | |
925 | ||
926 | do { | |
927 | int i, k; | |
928 | ||
929 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { | |
930 | unsigned long tmo = expire; | |
931 | ||
932 | k = (k + 1) & rt_hash_mask; | |
933 | rthp = &rt_hash_table[k].chain; | |
22c047cc | 934 | spin_lock_bh(rt_hash_lock_addr(k)); |
1c31720a ED |
935 | while ((rth = rcu_dereference_protected(*rthp, |
936 | lockdep_is_held(rt_hash_lock_addr(k)))) != NULL) { | |
e84f84f2 | 937 | if (!rt_is_expired(rth) && |
29e75252 | 938 | !rt_may_expire(rth, tmo, expire)) { |
1da177e4 | 939 | tmo >>= 1; |
d8d1f30b | 940 | rthp = &rth->dst.rt_next; |
1da177e4 LT |
941 | continue; |
942 | } | |
d8d1f30b | 943 | *rthp = rth->dst.rt_next; |
1da177e4 LT |
944 | rt_free(rth); |
945 | goal--; | |
1da177e4 | 946 | } |
22c047cc | 947 | spin_unlock_bh(rt_hash_lock_addr(k)); |
1da177e4 LT |
948 | if (goal <= 0) |
949 | break; | |
950 | } | |
951 | rover = k; | |
952 | ||
953 | if (goal <= 0) | |
954 | goto work_done; | |
955 | ||
956 | /* Goal is not achieved. We stop process if: | |
957 | ||
958 | - if expire reduced to zero. Otherwise, expire is halfed. | |
959 | - if table is not full. | |
960 | - if we are called from interrupt. | |
961 | - jiffies check is just fallback/debug loop breaker. | |
962 | We will not spin here for long time in any case. | |
963 | */ | |
964 | ||
965 | RT_CACHE_STAT_INC(gc_goal_miss); | |
966 | ||
967 | if (expire == 0) | |
968 | break; | |
969 | ||
970 | expire >>= 1; | |
1da177e4 | 971 | |
fc66f95c | 972 | if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size) |
1da177e4 LT |
973 | goto out; |
974 | } while (!in_softirq() && time_before_eq(jiffies, now)); | |
975 | ||
fc66f95c ED |
976 | if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size) |
977 | goto out; | |
978 | if (dst_entries_get_slow(&ipv4_dst_ops) < ip_rt_max_size) | |
1da177e4 LT |
979 | goto out; |
980 | if (net_ratelimit()) | |
981 | printk(KERN_WARNING "dst cache overflow\n"); | |
982 | RT_CACHE_STAT_INC(gc_dst_overflow); | |
983 | return 1; | |
984 | ||
985 | work_done: | |
986 | expire += ip_rt_gc_min_interval; | |
987 | if (expire > ip_rt_gc_timeout || | |
fc66f95c ED |
988 | dst_entries_get_fast(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh || |
989 | dst_entries_get_slow(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh) | |
1da177e4 | 990 | expire = ip_rt_gc_timeout; |
1da177e4 LT |
991 | out: return 0; |
992 | } | |
993 | ||
98376387 ED |
994 | /* |
995 | * Returns number of entries in a hash chain that have different hash_inputs | |
996 | */ | |
997 | static int slow_chain_length(const struct rtable *head) | |
998 | { | |
999 | int length = 0; | |
1000 | const struct rtable *rth = head; | |
1001 | ||
1002 | while (rth) { | |
1003 | length += has_noalias(head, rth); | |
1c31720a | 1004 | rth = rcu_dereference_protected(rth->dst.rt_next, 1); |
98376387 ED |
1005 | } |
1006 | return length >> FRACT_BITS; | |
1007 | } | |
1008 | ||
b23dd4fe DM |
1009 | static struct rtable *rt_intern_hash(unsigned hash, struct rtable *rt, |
1010 | struct sk_buff *skb, int ifindex) | |
1da177e4 | 1011 | { |
1c31720a ED |
1012 | struct rtable *rth, *cand; |
1013 | struct rtable __rcu **rthp, **candp; | |
1da177e4 | 1014 | unsigned long now; |
1da177e4 LT |
1015 | u32 min_score; |
1016 | int chain_length; | |
1017 | int attempts = !in_softirq(); | |
1018 | ||
1019 | restart: | |
1020 | chain_length = 0; | |
1021 | min_score = ~(u32)0; | |
1022 | cand = NULL; | |
1023 | candp = NULL; | |
1024 | now = jiffies; | |
1025 | ||
d8d1f30b | 1026 | if (!rt_caching(dev_net(rt->dst.dev))) { |
73e42897 NH |
1027 | /* |
1028 | * If we're not caching, just tell the caller we | |
1029 | * were successful and don't touch the route. The | |
1030 | * caller hold the sole reference to the cache entry, and | |
1031 | * it will be released when the caller is done with it. | |
1032 | * If we drop it here, the callers have no way to resolve routes | |
1033 | * when we're not caching. Instead, just point *rp at rt, so | |
1034 | * the caller gets a single use out of the route | |
b6280b47 NH |
1035 | * Note that we do rt_free on this new route entry, so that |
1036 | * once its refcount hits zero, we are still able to reap it | |
1037 | * (Thanks Alexey) | |
27b75c95 ED |
1038 | * Note: To avoid expensive rcu stuff for this uncached dst, |
1039 | * we set DST_NOCACHE so that dst_release() can free dst without | |
1040 | * waiting a grace period. | |
73e42897 | 1041 | */ |
b6280b47 | 1042 | |
c7d4426a | 1043 | rt->dst.flags |= DST_NOCACHE; |
c7537967 | 1044 | if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) { |
d8d1f30b | 1045 | int err = arp_bind_neighbour(&rt->dst); |
b6280b47 NH |
1046 | if (err) { |
1047 | if (net_ratelimit()) | |
1048 | printk(KERN_WARNING | |
1049 | "Neighbour table failure & not caching routes.\n"); | |
27b75c95 | 1050 | ip_rt_put(rt); |
b23dd4fe | 1051 | return ERR_PTR(err); |
b6280b47 NH |
1052 | } |
1053 | } | |
1054 | ||
b6280b47 | 1055 | goto skip_hashing; |
1080d709 NH |
1056 | } |
1057 | ||
1da177e4 LT |
1058 | rthp = &rt_hash_table[hash].chain; |
1059 | ||
22c047cc | 1060 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1c31720a ED |
1061 | while ((rth = rcu_dereference_protected(*rthp, |
1062 | lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) { | |
e84f84f2 | 1063 | if (rt_is_expired(rth)) { |
d8d1f30b | 1064 | *rthp = rth->dst.rt_next; |
29e75252 ED |
1065 | rt_free(rth); |
1066 | continue; | |
1067 | } | |
5e2b61f7 | 1068 | if (compare_keys(rth, rt) && compare_netns(rth, rt)) { |
1da177e4 | 1069 | /* Put it first */ |
d8d1f30b | 1070 | *rthp = rth->dst.rt_next; |
1da177e4 LT |
1071 | /* |
1072 | * Since lookup is lockfree, the deletion | |
1073 | * must be visible to another weakly ordered CPU before | |
1074 | * the insertion at the start of the hash chain. | |
1075 | */ | |
d8d1f30b | 1076 | rcu_assign_pointer(rth->dst.rt_next, |
1da177e4 LT |
1077 | rt_hash_table[hash].chain); |
1078 | /* | |
1079 | * Since lookup is lockfree, the update writes | |
1080 | * must be ordered for consistency on SMP. | |
1081 | */ | |
1082 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); | |
1083 | ||
d8d1f30b | 1084 | dst_use(&rth->dst, now); |
22c047cc | 1085 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1086 | |
1087 | rt_drop(rt); | |
b23dd4fe | 1088 | if (skb) |
d8d1f30b | 1089 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 1090 | return rth; |
1da177e4 LT |
1091 | } |
1092 | ||
d8d1f30b | 1093 | if (!atomic_read(&rth->dst.__refcnt)) { |
1da177e4 LT |
1094 | u32 score = rt_score(rth); |
1095 | ||
1096 | if (score <= min_score) { | |
1097 | cand = rth; | |
1098 | candp = rthp; | |
1099 | min_score = score; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | chain_length++; | |
1104 | ||
d8d1f30b | 1105 | rthp = &rth->dst.rt_next; |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | if (cand) { | |
1109 | /* ip_rt_gc_elasticity used to be average length of chain | |
1110 | * length, when exceeded gc becomes really aggressive. | |
1111 | * | |
1112 | * The second limit is less certain. At the moment it allows | |
1113 | * only 2 entries per bucket. We will see. | |
1114 | */ | |
1115 | if (chain_length > ip_rt_gc_elasticity) { | |
d8d1f30b | 1116 | *candp = cand->dst.rt_next; |
1da177e4 LT |
1117 | rt_free(cand); |
1118 | } | |
1080d709 | 1119 | } else { |
98376387 ED |
1120 | if (chain_length > rt_chain_length_max && |
1121 | slow_chain_length(rt_hash_table[hash].chain) > rt_chain_length_max) { | |
d8d1f30b | 1122 | struct net *net = dev_net(rt->dst.dev); |
1080d709 | 1123 | int num = ++net->ipv4.current_rt_cache_rebuild_count; |
b35ecb5d | 1124 | if (!rt_caching(net)) { |
1080d709 | 1125 | printk(KERN_WARNING "%s: %d rebuilds is over limit, route caching disabled\n", |
d8d1f30b | 1126 | rt->dst.dev->name, num); |
1080d709 | 1127 | } |
b35ecb5d | 1128 | rt_emergency_hash_rebuild(net); |
6a2bad70 PE |
1129 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1130 | ||
5e2b61f7 | 1131 | hash = rt_hash(rt->rt_key_dst, rt->rt_key_src, |
6a2bad70 PE |
1132 | ifindex, rt_genid(net)); |
1133 | goto restart; | |
1080d709 | 1134 | } |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | /* Try to bind route to arp only if it is output | |
1138 | route or unicast forwarding path. | |
1139 | */ | |
c7537967 | 1140 | if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) { |
d8d1f30b | 1141 | int err = arp_bind_neighbour(&rt->dst); |
1da177e4 | 1142 | if (err) { |
22c047cc | 1143 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1144 | |
1145 | if (err != -ENOBUFS) { | |
1146 | rt_drop(rt); | |
b23dd4fe | 1147 | return ERR_PTR(err); |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | /* Neighbour tables are full and nothing | |
1151 | can be released. Try to shrink route cache, | |
1152 | it is most likely it holds some neighbour records. | |
1153 | */ | |
1154 | if (attempts-- > 0) { | |
1155 | int saved_elasticity = ip_rt_gc_elasticity; | |
1156 | int saved_int = ip_rt_gc_min_interval; | |
1157 | ip_rt_gc_elasticity = 1; | |
1158 | ip_rt_gc_min_interval = 0; | |
569d3645 | 1159 | rt_garbage_collect(&ipv4_dst_ops); |
1da177e4 LT |
1160 | ip_rt_gc_min_interval = saved_int; |
1161 | ip_rt_gc_elasticity = saved_elasticity; | |
1162 | goto restart; | |
1163 | } | |
1164 | ||
1165 | if (net_ratelimit()) | |
7e1b33e5 | 1166 | printk(KERN_WARNING "ipv4: Neighbour table overflow.\n"); |
1da177e4 | 1167 | rt_drop(rt); |
b23dd4fe | 1168 | return ERR_PTR(-ENOBUFS); |
1da177e4 LT |
1169 | } |
1170 | } | |
1171 | ||
d8d1f30b | 1172 | rt->dst.rt_next = rt_hash_table[hash].chain; |
1080d709 | 1173 | |
00269b54 ED |
1174 | /* |
1175 | * Since lookup is lockfree, we must make sure | |
25985edc | 1176 | * previous writes to rt are committed to memory |
00269b54 ED |
1177 | * before making rt visible to other CPUS. |
1178 | */ | |
1ddbcb00 | 1179 | rcu_assign_pointer(rt_hash_table[hash].chain, rt); |
1080d709 | 1180 | |
22c047cc | 1181 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
73e42897 | 1182 | |
b6280b47 | 1183 | skip_hashing: |
b23dd4fe | 1184 | if (skb) |
d8d1f30b | 1185 | skb_dst_set(skb, &rt->dst); |
b23dd4fe | 1186 | return rt; |
1da177e4 LT |
1187 | } |
1188 | ||
6431cbc2 DM |
1189 | static atomic_t __rt_peer_genid = ATOMIC_INIT(0); |
1190 | ||
1191 | static u32 rt_peer_genid(void) | |
1192 | { | |
1193 | return atomic_read(&__rt_peer_genid); | |
1194 | } | |
1195 | ||
a48eff12 | 1196 | void rt_bind_peer(struct rtable *rt, __be32 daddr, int create) |
1da177e4 | 1197 | { |
1da177e4 LT |
1198 | struct inet_peer *peer; |
1199 | ||
a48eff12 | 1200 | peer = inet_getpeer_v4(daddr, create); |
1da177e4 | 1201 | |
49e8ab03 | 1202 | if (peer && cmpxchg(&rt->peer, NULL, peer) != NULL) |
1da177e4 | 1203 | inet_putpeer(peer); |
6431cbc2 DM |
1204 | else |
1205 | rt->rt_peer_genid = rt_peer_genid(); | |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | /* | |
1209 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
1210 | * we still can generate some output. | |
1211 | * Random ID selection looks a bit dangerous because we have no chances to | |
1212 | * select ID being unique in a reasonable period of time. | |
1213 | * But broken packet identifier may be better than no packet at all. | |
1214 | */ | |
1215 | static void ip_select_fb_ident(struct iphdr *iph) | |
1216 | { | |
1217 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
1218 | static u32 ip_fallback_id; | |
1219 | u32 salt; | |
1220 | ||
1221 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 1222 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
1223 | iph->id = htons(salt & 0xFFFF); |
1224 | ip_fallback_id = salt; | |
1225 | spin_unlock_bh(&ip_fb_id_lock); | |
1226 | } | |
1227 | ||
1228 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
1229 | { | |
1230 | struct rtable *rt = (struct rtable *) dst; | |
1231 | ||
1232 | if (rt) { | |
1233 | if (rt->peer == NULL) | |
a48eff12 | 1234 | rt_bind_peer(rt, rt->rt_dst, 1); |
1da177e4 LT |
1235 | |
1236 | /* If peer is attached to destination, it is never detached, | |
1237 | so that we need not to grab a lock to dereference it. | |
1238 | */ | |
1239 | if (rt->peer) { | |
1240 | iph->id = htons(inet_getid(rt->peer, more)); | |
1241 | return; | |
1242 | } | |
1243 | } else | |
e905a9ed | 1244 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
9c2b3328 | 1245 | __builtin_return_address(0)); |
1da177e4 LT |
1246 | |
1247 | ip_select_fb_ident(iph); | |
1248 | } | |
4bc2f18b | 1249 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 LT |
1250 | |
1251 | static void rt_del(unsigned hash, struct rtable *rt) | |
1252 | { | |
1c31720a ED |
1253 | struct rtable __rcu **rthp; |
1254 | struct rtable *aux; | |
1da177e4 | 1255 | |
29e75252 | 1256 | rthp = &rt_hash_table[hash].chain; |
22c047cc | 1257 | spin_lock_bh(rt_hash_lock_addr(hash)); |
1da177e4 | 1258 | ip_rt_put(rt); |
1c31720a ED |
1259 | while ((aux = rcu_dereference_protected(*rthp, |
1260 | lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) { | |
e84f84f2 | 1261 | if (aux == rt || rt_is_expired(aux)) { |
d8d1f30b | 1262 | *rthp = aux->dst.rt_next; |
29e75252 ED |
1263 | rt_free(aux); |
1264 | continue; | |
1da177e4 | 1265 | } |
d8d1f30b | 1266 | rthp = &aux->dst.rt_next; |
29e75252 | 1267 | } |
22c047cc | 1268 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
1da177e4 LT |
1269 | } |
1270 | ||
ed7865a4 | 1271 | /* called in rcu_read_lock() section */ |
f7655229 AV |
1272 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
1273 | __be32 saddr, struct net_device *dev) | |
1da177e4 | 1274 | { |
ed7865a4 | 1275 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f39925db | 1276 | struct inet_peer *peer; |
317805b8 | 1277 | struct net *net; |
1da177e4 | 1278 | |
1da177e4 LT |
1279 | if (!in_dev) |
1280 | return; | |
1281 | ||
c346dca1 | 1282 | net = dev_net(dev); |
9d4fb27d JP |
1283 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
1284 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
1285 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
1286 | goto reject_redirect; |
1287 | ||
1288 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
1289 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
1290 | goto reject_redirect; | |
1291 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
1292 | goto reject_redirect; | |
1293 | } else { | |
317805b8 | 1294 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
1295 | goto reject_redirect; |
1296 | } | |
1297 | ||
f39925db DM |
1298 | peer = inet_getpeer_v4(daddr, 1); |
1299 | if (peer) { | |
1300 | peer->redirect_learned.a4 = new_gw; | |
e905a9ed | 1301 | |
f39925db | 1302 | inet_putpeer(peer); |
1da177e4 | 1303 | |
f39925db | 1304 | atomic_inc(&__rt_peer_genid); |
1da177e4 | 1305 | } |
1da177e4 LT |
1306 | return; |
1307 | ||
1308 | reject_redirect: | |
1309 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1310 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
673d57e7 HH |
1311 | printk(KERN_INFO "Redirect from %pI4 on %s about %pI4 ignored.\n" |
1312 | " Advised path = %pI4 -> %pI4\n", | |
1313 | &old_gw, dev->name, &new_gw, | |
1314 | &saddr, &daddr); | |
1da177e4 | 1315 | #endif |
ed7865a4 | 1316 | ; |
1da177e4 LT |
1317 | } |
1318 | ||
fe6fe792 ED |
1319 | static bool peer_pmtu_expired(struct inet_peer *peer) |
1320 | { | |
1321 | unsigned long orig = ACCESS_ONCE(peer->pmtu_expires); | |
1322 | ||
1323 | return orig && | |
1324 | time_after_eq(jiffies, orig) && | |
1325 | cmpxchg(&peer->pmtu_expires, orig, 0) == orig; | |
1326 | } | |
1327 | ||
1328 | static bool peer_pmtu_cleaned(struct inet_peer *peer) | |
1329 | { | |
1330 | unsigned long orig = ACCESS_ONCE(peer->pmtu_expires); | |
1331 | ||
1332 | return orig && | |
1333 | cmpxchg(&peer->pmtu_expires, orig, 0) == orig; | |
1334 | } | |
1335 | ||
1da177e4 LT |
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) { | |
d11a4dc1 | 1342 | if (dst->obsolete > 0) { |
1da177e4 LT |
1343 | ip_rt_put(rt); |
1344 | ret = NULL; | |
2c8cec5c | 1345 | } else if (rt->rt_flags & RTCF_REDIRECTED) { |
5e2b61f7 DM |
1346 | unsigned hash = rt_hash(rt->rt_key_dst, rt->rt_key_src, |
1347 | rt->rt_oif, | |
e84f84f2 | 1348 | rt_genid(dev_net(dst->dev))); |
1da177e4 LT |
1349 | rt_del(hash, rt); |
1350 | ret = NULL; | |
fe6fe792 ED |
1351 | } else if (rt->peer && peer_pmtu_expired(rt->peer)) { |
1352 | dst_metric_set(dst, RTAX_MTU, rt->peer->pmtu_orig); | |
1da177e4 LT |
1353 | } |
1354 | } | |
1355 | return ret; | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * Algorithm: | |
1360 | * 1. The first ip_rt_redirect_number redirects are sent | |
1361 | * with exponential backoff, then we stop sending them at all, | |
1362 | * assuming that the host ignores our redirects. | |
1363 | * 2. If we did not see packets requiring redirects | |
1364 | * during ip_rt_redirect_silence, we assume that the host | |
1365 | * forgot redirected route and start to send redirects again. | |
1366 | * | |
1367 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
1368 | * in icmp.c. | |
1369 | * | |
1370 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
1371 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
1372 | */ | |
1373 | ||
1374 | void ip_rt_send_redirect(struct sk_buff *skb) | |
1375 | { | |
511c3f92 | 1376 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 1377 | struct in_device *in_dev; |
92d86829 | 1378 | struct inet_peer *peer; |
30038fc6 | 1379 | int log_martians; |
1da177e4 | 1380 | |
30038fc6 | 1381 | rcu_read_lock(); |
d8d1f30b | 1382 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
1383 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
1384 | rcu_read_unlock(); | |
1da177e4 | 1385 | return; |
30038fc6 ED |
1386 | } |
1387 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
1388 | rcu_read_unlock(); | |
1da177e4 | 1389 | |
92d86829 | 1390 | if (!rt->peer) |
a48eff12 | 1391 | rt_bind_peer(rt, rt->rt_dst, 1); |
92d86829 DM |
1392 | peer = rt->peer; |
1393 | if (!peer) { | |
1394 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
1395 | return; | |
1396 | } | |
1397 | ||
1da177e4 LT |
1398 | /* No redirected packets during ip_rt_redirect_silence; |
1399 | * reset the algorithm. | |
1400 | */ | |
92d86829 DM |
1401 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
1402 | peer->rate_tokens = 0; | |
1da177e4 LT |
1403 | |
1404 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 1405 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 1406 | */ |
92d86829 DM |
1407 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
1408 | peer->rate_last = jiffies; | |
30038fc6 | 1409 | return; |
1da177e4 LT |
1410 | } |
1411 | ||
1412 | /* Check for load limit; set rate_last to the latest sent | |
1413 | * redirect. | |
1414 | */ | |
92d86829 | 1415 | if (peer->rate_tokens == 0 || |
14fb8a76 | 1416 | time_after(jiffies, |
92d86829 DM |
1417 | (peer->rate_last + |
1418 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
1da177e4 | 1419 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
92d86829 DM |
1420 | peer->rate_last = jiffies; |
1421 | ++peer->rate_tokens; | |
1da177e4 | 1422 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 1423 | if (log_martians && |
92d86829 | 1424 | peer->rate_tokens == ip_rt_redirect_number && |
1da177e4 | 1425 | net_ratelimit()) |
673d57e7 | 1426 | printk(KERN_WARNING "host %pI4/if%d ignores redirects for %pI4 to %pI4.\n", |
c5be24ff | 1427 | &ip_hdr(skb)->saddr, rt->rt_iif, |
673d57e7 | 1428 | &rt->rt_dst, &rt->rt_gateway); |
1da177e4 LT |
1429 | #endif |
1430 | } | |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | static int ip_error(struct sk_buff *skb) | |
1434 | { | |
511c3f92 | 1435 | struct rtable *rt = skb_rtable(skb); |
92d86829 | 1436 | struct inet_peer *peer; |
1da177e4 | 1437 | unsigned long now; |
92d86829 | 1438 | bool send; |
1da177e4 LT |
1439 | int code; |
1440 | ||
d8d1f30b | 1441 | switch (rt->dst.error) { |
1da177e4 LT |
1442 | case EINVAL: |
1443 | default: | |
1444 | goto out; | |
1445 | case EHOSTUNREACH: | |
1446 | code = ICMP_HOST_UNREACH; | |
1447 | break; | |
1448 | case ENETUNREACH: | |
1449 | code = ICMP_NET_UNREACH; | |
d8d1f30b | 1450 | IP_INC_STATS_BH(dev_net(rt->dst.dev), |
7c73a6fa | 1451 | IPSTATS_MIB_INNOROUTES); |
1da177e4 LT |
1452 | break; |
1453 | case EACCES: | |
1454 | code = ICMP_PKT_FILTERED; | |
1455 | break; | |
1456 | } | |
1457 | ||
92d86829 | 1458 | if (!rt->peer) |
a48eff12 | 1459 | rt_bind_peer(rt, rt->rt_dst, 1); |
92d86829 DM |
1460 | peer = rt->peer; |
1461 | ||
1462 | send = true; | |
1463 | if (peer) { | |
1464 | now = jiffies; | |
1465 | peer->rate_tokens += now - peer->rate_last; | |
1466 | if (peer->rate_tokens > ip_rt_error_burst) | |
1467 | peer->rate_tokens = ip_rt_error_burst; | |
1468 | peer->rate_last = now; | |
1469 | if (peer->rate_tokens >= ip_rt_error_cost) | |
1470 | peer->rate_tokens -= ip_rt_error_cost; | |
1471 | else | |
1472 | send = false; | |
1da177e4 | 1473 | } |
92d86829 DM |
1474 | if (send) |
1475 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
1476 | |
1477 | out: kfree_skb(skb); | |
1478 | return 0; | |
e905a9ed | 1479 | } |
1da177e4 LT |
1480 | |
1481 | /* | |
1482 | * The last two values are not from the RFC but | |
1483 | * are needed for AMPRnet AX.25 paths. | |
1484 | */ | |
1485 | ||
9b5b5cff | 1486 | static const unsigned short mtu_plateau[] = |
1da177e4 LT |
1487 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
1488 | ||
5969f71d | 1489 | static inline unsigned short guess_mtu(unsigned short old_mtu) |
1da177e4 LT |
1490 | { |
1491 | int i; | |
e905a9ed | 1492 | |
1da177e4 LT |
1493 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
1494 | if (old_mtu > mtu_plateau[i]) | |
1495 | return mtu_plateau[i]; | |
1496 | return 68; | |
1497 | } | |
1498 | ||
b71d1d42 | 1499 | unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph, |
0010e465 TT |
1500 | unsigned short new_mtu, |
1501 | struct net_device *dev) | |
1da177e4 | 1502 | { |
1da177e4 | 1503 | unsigned short old_mtu = ntohs(iph->tot_len); |
1da177e4 | 1504 | unsigned short est_mtu = 0; |
2c8cec5c | 1505 | struct inet_peer *peer; |
1da177e4 | 1506 | |
2c8cec5c DM |
1507 | peer = inet_getpeer_v4(iph->daddr, 1); |
1508 | if (peer) { | |
1509 | unsigned short mtu = new_mtu; | |
1da177e4 | 1510 | |
2c8cec5c DM |
1511 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
1512 | /* BSD 4.2 derived systems incorrectly adjust | |
1513 | * tot_len by the IP header length, and report | |
1514 | * a zero MTU in the ICMP message. | |
1515 | */ | |
1516 | if (mtu == 0 && | |
1517 | old_mtu >= 68 + (iph->ihl << 2)) | |
1518 | old_mtu -= iph->ihl << 2; | |
1519 | mtu = guess_mtu(old_mtu); | |
1520 | } | |
0010e465 | 1521 | |
2c8cec5c DM |
1522 | if (mtu < ip_rt_min_pmtu) |
1523 | mtu = ip_rt_min_pmtu; | |
1524 | if (!peer->pmtu_expires || mtu < peer->pmtu_learned) { | |
46af3180 HS |
1525 | unsigned long pmtu_expires; |
1526 | ||
1527 | pmtu_expires = jiffies + ip_rt_mtu_expires; | |
1528 | if (!pmtu_expires) | |
1529 | pmtu_expires = 1UL; | |
1530 | ||
2c8cec5c DM |
1531 | est_mtu = mtu; |
1532 | peer->pmtu_learned = mtu; | |
46af3180 | 1533 | peer->pmtu_expires = pmtu_expires; |
2c8cec5c | 1534 | } |
1da177e4 | 1535 | |
2c8cec5c | 1536 | inet_putpeer(peer); |
1da177e4 | 1537 | |
2c8cec5c | 1538 | atomic_inc(&__rt_peer_genid); |
1da177e4 LT |
1539 | } |
1540 | return est_mtu ? : new_mtu; | |
1541 | } | |
1542 | ||
2c8cec5c DM |
1543 | static void check_peer_pmtu(struct dst_entry *dst, struct inet_peer *peer) |
1544 | { | |
fe6fe792 | 1545 | unsigned long expires = ACCESS_ONCE(peer->pmtu_expires); |
2c8cec5c | 1546 | |
fe6fe792 ED |
1547 | if (!expires) |
1548 | return; | |
46af3180 | 1549 | if (time_before(jiffies, expires)) { |
2c8cec5c DM |
1550 | u32 orig_dst_mtu = dst_mtu(dst); |
1551 | if (peer->pmtu_learned < orig_dst_mtu) { | |
1552 | if (!peer->pmtu_orig) | |
1553 | peer->pmtu_orig = dst_metric_raw(dst, RTAX_MTU); | |
1554 | dst_metric_set(dst, RTAX_MTU, peer->pmtu_learned); | |
1555 | } | |
1556 | } else if (cmpxchg(&peer->pmtu_expires, expires, 0) == expires) | |
1557 | dst_metric_set(dst, RTAX_MTU, peer->pmtu_orig); | |
1558 | } | |
1559 | ||
1da177e4 LT |
1560 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
1561 | { | |
2c8cec5c DM |
1562 | struct rtable *rt = (struct rtable *) dst; |
1563 | struct inet_peer *peer; | |
1564 | ||
1565 | dst_confirm(dst); | |
1566 | ||
1567 | if (!rt->peer) | |
a48eff12 | 1568 | rt_bind_peer(rt, rt->rt_dst, 1); |
2c8cec5c DM |
1569 | peer = rt->peer; |
1570 | if (peer) { | |
fe6fe792 ED |
1571 | unsigned long pmtu_expires = ACCESS_ONCE(peer->pmtu_expires); |
1572 | ||
2c8cec5c | 1573 | if (mtu < ip_rt_min_pmtu) |
1da177e4 | 1574 | mtu = ip_rt_min_pmtu; |
fe6fe792 | 1575 | if (!pmtu_expires || mtu < peer->pmtu_learned) { |
46af3180 HS |
1576 | |
1577 | pmtu_expires = jiffies + ip_rt_mtu_expires; | |
1578 | if (!pmtu_expires) | |
1579 | pmtu_expires = 1UL; | |
1580 | ||
2c8cec5c | 1581 | peer->pmtu_learned = mtu; |
46af3180 | 1582 | peer->pmtu_expires = pmtu_expires; |
2c8cec5c DM |
1583 | |
1584 | atomic_inc(&__rt_peer_genid); | |
1585 | rt->rt_peer_genid = rt_peer_genid(); | |
1da177e4 | 1586 | } |
46af3180 | 1587 | check_peer_pmtu(dst, peer); |
1da177e4 LT |
1588 | } |
1589 | } | |
1590 | ||
f39925db DM |
1591 | static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer) |
1592 | { | |
1593 | struct rtable *rt = (struct rtable *) dst; | |
1594 | __be32 orig_gw = rt->rt_gateway; | |
1595 | ||
1596 | dst_confirm(&rt->dst); | |
1597 | ||
1598 | neigh_release(rt->dst.neighbour); | |
1599 | rt->dst.neighbour = NULL; | |
1600 | ||
1601 | rt->rt_gateway = peer->redirect_learned.a4; | |
1602 | if (arp_bind_neighbour(&rt->dst) || | |
1603 | !(rt->dst.neighbour->nud_state & NUD_VALID)) { | |
1604 | if (rt->dst.neighbour) | |
1605 | neigh_event_send(rt->dst.neighbour, NULL); | |
1606 | rt->rt_gateway = orig_gw; | |
1607 | return -EAGAIN; | |
1608 | } else { | |
1609 | rt->rt_flags |= RTCF_REDIRECTED; | |
1610 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, | |
1611 | rt->dst.neighbour); | |
1612 | } | |
1613 | return 0; | |
1614 | } | |
1615 | ||
1da177e4 LT |
1616 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1617 | { | |
6431cbc2 DM |
1618 | struct rtable *rt = (struct rtable *) dst; |
1619 | ||
1620 | if (rt_is_expired(rt)) | |
d11a4dc1 | 1621 | return NULL; |
6431cbc2 | 1622 | if (rt->rt_peer_genid != rt_peer_genid()) { |
2c8cec5c DM |
1623 | struct inet_peer *peer; |
1624 | ||
6431cbc2 | 1625 | if (!rt->peer) |
a48eff12 | 1626 | rt_bind_peer(rt, rt->rt_dst, 0); |
6431cbc2 | 1627 | |
2c8cec5c | 1628 | peer = rt->peer; |
fe6fe792 | 1629 | if (peer) { |
2c8cec5c DM |
1630 | check_peer_pmtu(dst, peer); |
1631 | ||
fe6fe792 ED |
1632 | if (peer->redirect_learned.a4 && |
1633 | peer->redirect_learned.a4 != rt->rt_gateway) { | |
1634 | if (check_peer_redir(dst, peer)) | |
1635 | return NULL; | |
1636 | } | |
f39925db DM |
1637 | } |
1638 | ||
6431cbc2 DM |
1639 | rt->rt_peer_genid = rt_peer_genid(); |
1640 | } | |
d11a4dc1 | 1641 | return dst; |
1da177e4 LT |
1642 | } |
1643 | ||
1644 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1645 | { | |
1646 | struct rtable *rt = (struct rtable *) dst; | |
1647 | struct inet_peer *peer = rt->peer; | |
1da177e4 | 1648 | |
62fa8a84 DM |
1649 | if (rt->fi) { |
1650 | fib_info_put(rt->fi); | |
1651 | rt->fi = NULL; | |
1652 | } | |
1da177e4 LT |
1653 | if (peer) { |
1654 | rt->peer = NULL; | |
1655 | inet_putpeer(peer); | |
1656 | } | |
1da177e4 LT |
1657 | } |
1658 | ||
1da177e4 LT |
1659 | |
1660 | static void ipv4_link_failure(struct sk_buff *skb) | |
1661 | { | |
1662 | struct rtable *rt; | |
1663 | ||
1664 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1665 | ||
511c3f92 | 1666 | rt = skb_rtable(skb); |
fe6fe792 ED |
1667 | if (rt && rt->peer && peer_pmtu_cleaned(rt->peer)) |
1668 | dst_metric_set(&rt->dst, RTAX_MTU, rt->peer->pmtu_orig); | |
1da177e4 LT |
1669 | } |
1670 | ||
1671 | static int ip_rt_bug(struct sk_buff *skb) | |
1672 | { | |
673d57e7 HH |
1673 | printk(KERN_DEBUG "ip_rt_bug: %pI4 -> %pI4, %s\n", |
1674 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1da177e4 LT |
1675 | skb->dev ? skb->dev->name : "?"); |
1676 | kfree_skb(skb); | |
c378a9c0 | 1677 | WARN_ON(1); |
1da177e4 LT |
1678 | return 0; |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | We do not cache source address of outgoing interface, | |
1683 | because it is used only by IP RR, TS and SRR options, | |
1684 | so that it out of fast path. | |
1685 | ||
1686 | BTW remember: "addr" is allowed to be not aligned | |
1687 | in IP options! | |
1688 | */ | |
1689 | ||
8e36360a | 1690 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1691 | { |
a61ced5d | 1692 | __be32 src; |
1da177e4 | 1693 | |
c7537967 | 1694 | if (rt_is_output_route(rt)) |
c5be24ff | 1695 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1696 | else { |
8e36360a DM |
1697 | struct fib_result res; |
1698 | struct flowi4 fl4; | |
1699 | struct iphdr *iph; | |
1700 | ||
1701 | iph = ip_hdr(skb); | |
1702 | ||
1703 | memset(&fl4, 0, sizeof(fl4)); | |
1704 | fl4.daddr = iph->daddr; | |
1705 | fl4.saddr = iph->saddr; | |
1706 | fl4.flowi4_tos = iph->tos; | |
1707 | fl4.flowi4_oif = rt->dst.dev->ifindex; | |
1708 | fl4.flowi4_iif = skb->dev->ifindex; | |
1709 | fl4.flowi4_mark = skb->mark; | |
5e2b61f7 | 1710 | |
ebc0ffae | 1711 | rcu_read_lock(); |
68a5e3dd | 1712 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) |
436c3b66 | 1713 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
ebc0ffae ED |
1714 | else |
1715 | src = inet_select_addr(rt->dst.dev, rt->rt_gateway, | |
1da177e4 | 1716 | RT_SCOPE_UNIVERSE); |
ebc0ffae ED |
1717 | rcu_read_unlock(); |
1718 | } | |
1da177e4 LT |
1719 | memcpy(addr, &src, 4); |
1720 | } | |
1721 | ||
c7066f70 | 1722 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1723 | static void set_class_tag(struct rtable *rt, u32 tag) |
1724 | { | |
d8d1f30b CG |
1725 | if (!(rt->dst.tclassid & 0xFFFF)) |
1726 | rt->dst.tclassid |= tag & 0xFFFF; | |
1727 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1728 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1729 | } |
1730 | #endif | |
1731 | ||
0dbaee3b DM |
1732 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1733 | { | |
1734 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); | |
1735 | ||
1736 | if (advmss == 0) { | |
1737 | advmss = max_t(unsigned int, dst->dev->mtu - 40, | |
1738 | ip_rt_min_advmss); | |
1739 | if (advmss > 65535 - 40) | |
1740 | advmss = 65535 - 40; | |
1741 | } | |
1742 | return advmss; | |
1743 | } | |
1744 | ||
d33e4553 DM |
1745 | static unsigned int ipv4_default_mtu(const struct dst_entry *dst) |
1746 | { | |
1747 | unsigned int mtu = dst->dev->mtu; | |
1748 | ||
1749 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { | |
1750 | const struct rtable *rt = (const struct rtable *) dst; | |
1751 | ||
1752 | if (rt->rt_gateway != rt->rt_dst && mtu > 576) | |
1753 | mtu = 576; | |
1754 | } | |
1755 | ||
1756 | if (mtu > IP_MAX_MTU) | |
1757 | mtu = IP_MAX_MTU; | |
1758 | ||
1759 | return mtu; | |
1760 | } | |
1761 | ||
813b3b5d | 1762 | static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4, |
5e2b61f7 | 1763 | struct fib_info *fi) |
a4daad6b | 1764 | { |
0131ba45 DM |
1765 | struct inet_peer *peer; |
1766 | int create = 0; | |
a4daad6b | 1767 | |
0131ba45 DM |
1768 | /* If a peer entry exists for this destination, we must hook |
1769 | * it up in order to get at cached metrics. | |
1770 | */ | |
813b3b5d | 1771 | if (fl4 && (fl4->flowi4_flags & FLOWI_FLAG_PRECOW_METRICS)) |
0131ba45 DM |
1772 | create = 1; |
1773 | ||
3c0afdca | 1774 | rt->peer = peer = inet_getpeer_v4(rt->rt_dst, create); |
0131ba45 | 1775 | if (peer) { |
3c0afdca | 1776 | rt->rt_peer_genid = rt_peer_genid(); |
a4daad6b DM |
1777 | if (inet_metrics_new(peer)) |
1778 | memcpy(peer->metrics, fi->fib_metrics, | |
1779 | sizeof(u32) * RTAX_MAX); | |
1780 | dst_init_metrics(&rt->dst, peer->metrics, false); | |
2c8cec5c | 1781 | |
fe6fe792 | 1782 | check_peer_pmtu(&rt->dst, peer); |
f39925db DM |
1783 | if (peer->redirect_learned.a4 && |
1784 | peer->redirect_learned.a4 != rt->rt_gateway) { | |
1785 | rt->rt_gateway = peer->redirect_learned.a4; | |
1786 | rt->rt_flags |= RTCF_REDIRECTED; | |
1787 | } | |
0131ba45 DM |
1788 | } else { |
1789 | if (fi->fib_metrics != (u32 *) dst_default_metrics) { | |
1790 | rt->fi = fi; | |
1791 | atomic_inc(&fi->fib_clntref); | |
1792 | } | |
1793 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); | |
a4daad6b DM |
1794 | } |
1795 | } | |
1796 | ||
813b3b5d | 1797 | static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4, |
5e2b61f7 | 1798 | const struct fib_result *res, |
982721f3 | 1799 | struct fib_info *fi, u16 type, u32 itag) |
1da177e4 | 1800 | { |
defb3519 | 1801 | struct dst_entry *dst = &rt->dst; |
1da177e4 LT |
1802 | |
1803 | if (fi) { | |
1804 | if (FIB_RES_GW(*res) && | |
1805 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
1806 | rt->rt_gateway = FIB_RES_GW(*res); | |
813b3b5d | 1807 | rt_init_metrics(rt, fl4, fi); |
c7066f70 | 1808 | #ifdef CONFIG_IP_ROUTE_CLASSID |
defb3519 | 1809 | dst->tclassid = FIB_RES_NH(*res).nh_tclassid; |
1da177e4 | 1810 | #endif |
d33e4553 | 1811 | } |
defb3519 | 1812 | |
defb3519 DM |
1813 | if (dst_mtu(dst) > IP_MAX_MTU) |
1814 | dst_metric_set(dst, RTAX_MTU, IP_MAX_MTU); | |
0dbaee3b | 1815 | if (dst_metric_raw(dst, RTAX_ADVMSS) > 65535 - 40) |
defb3519 | 1816 | dst_metric_set(dst, RTAX_ADVMSS, 65535 - 40); |
1da177e4 | 1817 | |
c7066f70 | 1818 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1819 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1820 | set_class_tag(rt, fib_rules_tclass(res)); | |
1821 | #endif | |
1822 | set_class_tag(rt, itag); | |
1823 | #endif | |
1da177e4 LT |
1824 | } |
1825 | ||
5c1e6aa3 DM |
1826 | static struct rtable *rt_dst_alloc(struct net_device *dev, |
1827 | bool nopolicy, bool noxfrm) | |
0c4dcd58 | 1828 | { |
5c1e6aa3 DM |
1829 | return dst_alloc(&ipv4_dst_ops, dev, 1, -1, |
1830 | DST_HOST | | |
1831 | (nopolicy ? DST_NOPOLICY : 0) | | |
1832 | (noxfrm ? DST_NOXFRM : 0)); | |
0c4dcd58 DM |
1833 | } |
1834 | ||
96d36220 | 1835 | /* called in rcu_read_lock() section */ |
9e12bb22 | 1836 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1837 | u8 tos, struct net_device *dev, int our) |
1838 | { | |
96d36220 | 1839 | unsigned int hash; |
1da177e4 | 1840 | struct rtable *rth; |
a61ced5d | 1841 | __be32 spec_dst; |
96d36220 | 1842 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1843 | u32 itag = 0; |
b5f7e755 | 1844 | int err; |
1da177e4 LT |
1845 | |
1846 | /* Primary sanity checks. */ | |
1847 | ||
1848 | if (in_dev == NULL) | |
1849 | return -EINVAL; | |
1850 | ||
1e637c74 | 1851 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 1852 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1853 | goto e_inval; |
1854 | ||
f97c1e0c JP |
1855 | if (ipv4_is_zeronet(saddr)) { |
1856 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 LT |
1857 | goto e_inval; |
1858 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
b5f7e755 | 1859 | } else { |
5c04c819 MS |
1860 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, &spec_dst, |
1861 | &itag); | |
b5f7e755 ED |
1862 | if (err < 0) |
1863 | goto e_err; | |
1864 | } | |
5c1e6aa3 DM |
1865 | rth = rt_dst_alloc(init_net.loopback_dev, |
1866 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false); | |
1da177e4 LT |
1867 | if (!rth) |
1868 | goto e_nobufs; | |
1869 | ||
cf911662 DM |
1870 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1871 | rth->dst.tclassid = itag; | |
1872 | #endif | |
d8d1f30b | 1873 | rth->dst.output = ip_rt_bug; |
1da177e4 | 1874 | |
5e2b61f7 | 1875 | rth->rt_key_dst = daddr; |
5e2b61f7 | 1876 | rth->rt_key_src = saddr; |
cf911662 DM |
1877 | rth->rt_genid = rt_genid(dev_net(dev)); |
1878 | rth->rt_flags = RTCF_MULTICAST; | |
1879 | rth->rt_type = RTN_MULTICAST; | |
475949d8 | 1880 | rth->rt_key_tos = tos; |
cf911662 | 1881 | rth->rt_dst = daddr; |
1da177e4 | 1882 | rth->rt_src = saddr; |
1b86a58f | 1883 | rth->rt_route_iif = dev->ifindex; |
5e2b61f7 | 1884 | rth->rt_iif = dev->ifindex; |
5e2b61f7 | 1885 | rth->rt_oif = 0; |
cf911662 | 1886 | rth->rt_mark = skb->mark; |
1da177e4 LT |
1887 | rth->rt_gateway = daddr; |
1888 | rth->rt_spec_dst= spec_dst; | |
cf911662 DM |
1889 | rth->rt_peer_genid = 0; |
1890 | rth->peer = NULL; | |
1891 | rth->fi = NULL; | |
1da177e4 | 1892 | if (our) { |
d8d1f30b | 1893 | rth->dst.input= ip_local_deliver; |
1da177e4 LT |
1894 | rth->rt_flags |= RTCF_LOCAL; |
1895 | } | |
1896 | ||
1897 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1898 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1899 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1900 | #endif |
1901 | RT_CACHE_STAT_INC(in_slow_mc); | |
1902 | ||
e84f84f2 | 1903 | hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev))); |
b23dd4fe | 1904 | rth = rt_intern_hash(hash, rth, skb, dev->ifindex); |
9aa3c94c | 1905 | return IS_ERR(rth) ? PTR_ERR(rth) : 0; |
1da177e4 LT |
1906 | |
1907 | e_nobufs: | |
1da177e4 | 1908 | return -ENOBUFS; |
1da177e4 | 1909 | e_inval: |
96d36220 | 1910 | return -EINVAL; |
b5f7e755 | 1911 | e_err: |
b5f7e755 | 1912 | return err; |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | ||
1916 | static void ip_handle_martian_source(struct net_device *dev, | |
1917 | struct in_device *in_dev, | |
1918 | struct sk_buff *skb, | |
9e12bb22 AV |
1919 | __be32 daddr, |
1920 | __be32 saddr) | |
1da177e4 LT |
1921 | { |
1922 | RT_CACHE_STAT_INC(in_martian_src); | |
1923 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1924 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1925 | /* | |
1926 | * RFC1812 recommendation, if source is martian, | |
1927 | * the only hint is MAC header. | |
1928 | */ | |
673d57e7 HH |
1929 | printk(KERN_WARNING "martian source %pI4 from %pI4, on dev %s\n", |
1930 | &daddr, &saddr, dev->name); | |
98e399f8 | 1931 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
1da177e4 | 1932 | int i; |
98e399f8 | 1933 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
1934 | printk(KERN_WARNING "ll header: "); |
1935 | for (i = 0; i < dev->hard_header_len; i++, p++) { | |
1936 | printk("%02x", *p); | |
1937 | if (i < (dev->hard_header_len - 1)) | |
1938 | printk(":"); | |
1939 | } | |
1940 | printk("\n"); | |
1941 | } | |
1942 | } | |
1943 | #endif | |
1944 | } | |
1945 | ||
47360228 | 1946 | /* called in rcu_read_lock() section */ |
5969f71d | 1947 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1948 | const struct fib_result *res, |
5969f71d SH |
1949 | struct in_device *in_dev, |
1950 | __be32 daddr, __be32 saddr, u32 tos, | |
1951 | struct rtable **result) | |
1da177e4 | 1952 | { |
1da177e4 LT |
1953 | struct rtable *rth; |
1954 | int err; | |
1955 | struct in_device *out_dev; | |
47360228 | 1956 | unsigned int flags = 0; |
d9c9df8c AV |
1957 | __be32 spec_dst; |
1958 | u32 itag; | |
1da177e4 LT |
1959 | |
1960 | /* get a working reference to the output device */ | |
47360228 | 1961 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
1da177e4 LT |
1962 | if (out_dev == NULL) { |
1963 | if (net_ratelimit()) | |
1964 | printk(KERN_CRIT "Bug in ip_route_input" \ | |
1965 | "_slow(). Please, report\n"); | |
1966 | return -EINVAL; | |
1967 | } | |
1968 | ||
1969 | ||
5c04c819 MS |
1970 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
1971 | in_dev->dev, &spec_dst, &itag); | |
1da177e4 | 1972 | if (err < 0) { |
e905a9ed | 1973 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1974 | saddr); |
e905a9ed | 1975 | |
1da177e4 LT |
1976 | goto cleanup; |
1977 | } | |
1978 | ||
1979 | if (err) | |
1980 | flags |= RTCF_DIRECTSRC; | |
1981 | ||
51b77cae | 1982 | if (out_dev == in_dev && err && |
1da177e4 LT |
1983 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1984 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1985 | flags |= RTCF_DOREDIRECT; | |
1986 | ||
1987 | if (skb->protocol != htons(ETH_P_IP)) { | |
1988 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1989 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1990 | * |
1991 | * Proxy arp feature have been extended to allow, ARP | |
1992 | * replies back to the same interface, to support | |
1993 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1994 | */ |
65324144 JDB |
1995 | if (out_dev == in_dev && |
1996 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1997 | err = -EINVAL; |
1998 | goto cleanup; | |
1999 | } | |
2000 | } | |
2001 | ||
5c1e6aa3 DM |
2002 | rth = rt_dst_alloc(out_dev->dev, |
2003 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
0c4dcd58 | 2004 | IN_DEV_CONF_GET(out_dev, NOXFRM)); |
1da177e4 LT |
2005 | if (!rth) { |
2006 | err = -ENOBUFS; | |
2007 | goto cleanup; | |
2008 | } | |
2009 | ||
5e2b61f7 | 2010 | rth->rt_key_dst = daddr; |
5e2b61f7 | 2011 | rth->rt_key_src = saddr; |
cf911662 DM |
2012 | rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); |
2013 | rth->rt_flags = flags; | |
2014 | rth->rt_type = res->type; | |
475949d8 | 2015 | rth->rt_key_tos = tos; |
cf911662 | 2016 | rth->rt_dst = daddr; |
1da177e4 | 2017 | rth->rt_src = saddr; |
1b86a58f | 2018 | rth->rt_route_iif = in_dev->dev->ifindex; |
5e2b61f7 | 2019 | rth->rt_iif = in_dev->dev->ifindex; |
5e2b61f7 | 2020 | rth->rt_oif = 0; |
cf911662 DM |
2021 | rth->rt_mark = skb->mark; |
2022 | rth->rt_gateway = daddr; | |
1da177e4 | 2023 | rth->rt_spec_dst= spec_dst; |
cf911662 DM |
2024 | rth->rt_peer_genid = 0; |
2025 | rth->peer = NULL; | |
2026 | rth->fi = NULL; | |
1da177e4 | 2027 | |
d8d1f30b CG |
2028 | rth->dst.input = ip_forward; |
2029 | rth->dst.output = ip_output; | |
1da177e4 | 2030 | |
5e2b61f7 | 2031 | rt_set_nexthop(rth, NULL, res, res->fi, res->type, itag); |
1da177e4 | 2032 | |
1da177e4 LT |
2033 | *result = rth; |
2034 | err = 0; | |
2035 | cleanup: | |
1da177e4 | 2036 | return err; |
e905a9ed | 2037 | } |
1da177e4 | 2038 | |
5969f71d SH |
2039 | static int ip_mkroute_input(struct sk_buff *skb, |
2040 | struct fib_result *res, | |
68a5e3dd | 2041 | const struct flowi4 *fl4, |
5969f71d SH |
2042 | struct in_device *in_dev, |
2043 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 2044 | { |
7abaa27c | 2045 | struct rtable* rth = NULL; |
1da177e4 LT |
2046 | int err; |
2047 | unsigned hash; | |
2048 | ||
2049 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
ff3fccb3 | 2050 | if (res->fi && res->fi->fib_nhs > 1) |
1b7fe593 | 2051 | fib_select_multipath(res); |
1da177e4 LT |
2052 | #endif |
2053 | ||
2054 | /* create a routing cache entry */ | |
2055 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
2056 | if (err) | |
2057 | return err; | |
1da177e4 LT |
2058 | |
2059 | /* put it into the cache */ | |
68a5e3dd | 2060 | hash = rt_hash(daddr, saddr, fl4->flowi4_iif, |
d8d1f30b | 2061 | rt_genid(dev_net(rth->dst.dev))); |
68a5e3dd | 2062 | rth = rt_intern_hash(hash, rth, skb, fl4->flowi4_iif); |
b23dd4fe DM |
2063 | if (IS_ERR(rth)) |
2064 | return PTR_ERR(rth); | |
2065 | return 0; | |
1da177e4 LT |
2066 | } |
2067 | ||
1da177e4 LT |
2068 | /* |
2069 | * NOTE. We drop all the packets that has local source | |
2070 | * addresses, because every properly looped back packet | |
2071 | * must have correct destination already attached by output routine. | |
2072 | * | |
2073 | * Such approach solves two big problems: | |
2074 | * 1. Not simplex devices are handled properly. | |
2075 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 2076 | * called with rcu_read_lock() |
1da177e4 LT |
2077 | */ |
2078 | ||
9e12bb22 | 2079 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
2080 | u8 tos, struct net_device *dev) |
2081 | { | |
2082 | struct fib_result res; | |
96d36220 | 2083 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
68a5e3dd | 2084 | struct flowi4 fl4; |
1da177e4 LT |
2085 | unsigned flags = 0; |
2086 | u32 itag = 0; | |
2087 | struct rtable * rth; | |
2088 | unsigned hash; | |
9e12bb22 | 2089 | __be32 spec_dst; |
1da177e4 | 2090 | int err = -EINVAL; |
c346dca1 | 2091 | struct net * net = dev_net(dev); |
1da177e4 LT |
2092 | |
2093 | /* IP on this device is disabled. */ | |
2094 | ||
2095 | if (!in_dev) | |
2096 | goto out; | |
2097 | ||
2098 | /* Check for the most weird martians, which can be not detected | |
2099 | by fib_lookup. | |
2100 | */ | |
2101 | ||
1e637c74 | 2102 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
f97c1e0c | 2103 | ipv4_is_loopback(saddr)) |
1da177e4 LT |
2104 | goto martian_source; |
2105 | ||
27a954bd | 2106 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2107 | goto brd_input; |
2108 | ||
2109 | /* Accept zero addresses only to limited broadcast; | |
2110 | * I even do not know to fix it or not. Waiting for complains :-) | |
2111 | */ | |
f97c1e0c | 2112 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2113 | goto martian_source; |
2114 | ||
27a954bd | 2115 | if (ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr)) |
1da177e4 LT |
2116 | goto martian_destination; |
2117 | ||
2118 | /* | |
2119 | * Now we are ready to route packet. | |
2120 | */ | |
68a5e3dd DM |
2121 | fl4.flowi4_oif = 0; |
2122 | fl4.flowi4_iif = dev->ifindex; | |
2123 | fl4.flowi4_mark = skb->mark; | |
2124 | fl4.flowi4_tos = tos; | |
2125 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
2126 | fl4.daddr = daddr; | |
2127 | fl4.saddr = saddr; | |
2128 | err = fib_lookup(net, &fl4, &res); | |
ebc0ffae | 2129 | if (err != 0) { |
1da177e4 | 2130 | if (!IN_DEV_FORWARD(in_dev)) |
2c2910a4 | 2131 | goto e_hostunreach; |
1da177e4 LT |
2132 | goto no_route; |
2133 | } | |
1da177e4 LT |
2134 | |
2135 | RT_CACHE_STAT_INC(in_slow_tot); | |
2136 | ||
2137 | if (res.type == RTN_BROADCAST) | |
2138 | goto brd_input; | |
2139 | ||
2140 | if (res.type == RTN_LOCAL) { | |
5c04c819 | 2141 | err = fib_validate_source(skb, saddr, daddr, tos, |
ebc0ffae | 2142 | net->loopback_dev->ifindex, |
5c04c819 | 2143 | dev, &spec_dst, &itag); |
b5f7e755 ED |
2144 | if (err < 0) |
2145 | goto martian_source_keep_err; | |
2146 | if (err) | |
1da177e4 LT |
2147 | flags |= RTCF_DIRECTSRC; |
2148 | spec_dst = daddr; | |
2149 | goto local_input; | |
2150 | } | |
2151 | ||
2152 | if (!IN_DEV_FORWARD(in_dev)) | |
2c2910a4 | 2153 | goto e_hostunreach; |
1da177e4 LT |
2154 | if (res.type != RTN_UNICAST) |
2155 | goto martian_destination; | |
2156 | ||
68a5e3dd | 2157 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
1da177e4 LT |
2158 | out: return err; |
2159 | ||
2160 | brd_input: | |
2161 | if (skb->protocol != htons(ETH_P_IP)) | |
2162 | goto e_inval; | |
2163 | ||
f97c1e0c | 2164 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2165 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
2166 | else { | |
5c04c819 MS |
2167 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, &spec_dst, |
2168 | &itag); | |
1da177e4 | 2169 | if (err < 0) |
b5f7e755 | 2170 | goto martian_source_keep_err; |
1da177e4 LT |
2171 | if (err) |
2172 | flags |= RTCF_DIRECTSRC; | |
2173 | } | |
2174 | flags |= RTCF_BROADCAST; | |
2175 | res.type = RTN_BROADCAST; | |
2176 | RT_CACHE_STAT_INC(in_brd); | |
2177 | ||
2178 | local_input: | |
5c1e6aa3 DM |
2179 | rth = rt_dst_alloc(net->loopback_dev, |
2180 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false); | |
1da177e4 LT |
2181 | if (!rth) |
2182 | goto e_nobufs; | |
2183 | ||
cf911662 | 2184 | rth->dst.input= ip_local_deliver; |
d8d1f30b | 2185 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
2186 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2187 | rth->dst.tclassid = itag; | |
2188 | #endif | |
1da177e4 | 2189 | |
5e2b61f7 | 2190 | rth->rt_key_dst = daddr; |
5e2b61f7 | 2191 | rth->rt_key_src = saddr; |
cf911662 DM |
2192 | rth->rt_genid = rt_genid(net); |
2193 | rth->rt_flags = flags|RTCF_LOCAL; | |
2194 | rth->rt_type = res.type; | |
475949d8 | 2195 | rth->rt_key_tos = tos; |
cf911662 | 2196 | rth->rt_dst = daddr; |
1da177e4 | 2197 | rth->rt_src = saddr; |
c7066f70 | 2198 | #ifdef CONFIG_IP_ROUTE_CLASSID |
d8d1f30b | 2199 | rth->dst.tclassid = itag; |
1da177e4 | 2200 | #endif |
1b86a58f | 2201 | rth->rt_route_iif = dev->ifindex; |
5e2b61f7 | 2202 | rth->rt_iif = dev->ifindex; |
cf911662 DM |
2203 | rth->rt_oif = 0; |
2204 | rth->rt_mark = skb->mark; | |
1da177e4 LT |
2205 | rth->rt_gateway = daddr; |
2206 | rth->rt_spec_dst= spec_dst; | |
cf911662 DM |
2207 | rth->rt_peer_genid = 0; |
2208 | rth->peer = NULL; | |
2209 | rth->fi = NULL; | |
1da177e4 | 2210 | if (res.type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2211 | rth->dst.input= ip_error; |
2212 | rth->dst.error= -err; | |
1da177e4 LT |
2213 | rth->rt_flags &= ~RTCF_LOCAL; |
2214 | } | |
68a5e3dd DM |
2215 | hash = rt_hash(daddr, saddr, fl4.flowi4_iif, rt_genid(net)); |
2216 | rth = rt_intern_hash(hash, rth, skb, fl4.flowi4_iif); | |
b23dd4fe DM |
2217 | err = 0; |
2218 | if (IS_ERR(rth)) | |
2219 | err = PTR_ERR(rth); | |
ebc0ffae | 2220 | goto out; |
1da177e4 LT |
2221 | |
2222 | no_route: | |
2223 | RT_CACHE_STAT_INC(in_no_route); | |
2224 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
2225 | res.type = RTN_UNREACHABLE; | |
7f53878d MC |
2226 | if (err == -ESRCH) |
2227 | err = -ENETUNREACH; | |
1da177e4 LT |
2228 | goto local_input; |
2229 | ||
2230 | /* | |
2231 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2232 | */ | |
2233 | martian_destination: | |
2234 | RT_CACHE_STAT_INC(in_martian_dst); | |
2235 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
2236 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) | |
673d57e7 HH |
2237 | printk(KERN_WARNING "martian destination %pI4 from %pI4, dev %s\n", |
2238 | &daddr, &saddr, dev->name); | |
1da177e4 | 2239 | #endif |
2c2910a4 DE |
2240 | |
2241 | e_hostunreach: | |
e905a9ed | 2242 | err = -EHOSTUNREACH; |
ebc0ffae | 2243 | goto out; |
2c2910a4 | 2244 | |
1da177e4 LT |
2245 | e_inval: |
2246 | err = -EINVAL; | |
ebc0ffae | 2247 | goto out; |
1da177e4 LT |
2248 | |
2249 | e_nobufs: | |
2250 | err = -ENOBUFS; | |
ebc0ffae | 2251 | goto out; |
1da177e4 LT |
2252 | |
2253 | martian_source: | |
b5f7e755 ED |
2254 | err = -EINVAL; |
2255 | martian_source_keep_err: | |
1da177e4 | 2256 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
ebc0ffae | 2257 | goto out; |
1da177e4 LT |
2258 | } |
2259 | ||
407eadd9 ED |
2260 | int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2261 | u8 tos, struct net_device *dev, bool noref) | |
1da177e4 LT |
2262 | { |
2263 | struct rtable * rth; | |
2264 | unsigned hash; | |
2265 | int iif = dev->ifindex; | |
b5921910 | 2266 | struct net *net; |
96d36220 | 2267 | int res; |
1da177e4 | 2268 | |
c346dca1 | 2269 | net = dev_net(dev); |
1080d709 | 2270 | |
96d36220 ED |
2271 | rcu_read_lock(); |
2272 | ||
1080d709 NH |
2273 | if (!rt_caching(net)) |
2274 | goto skip_cache; | |
2275 | ||
1da177e4 | 2276 | tos &= IPTOS_RT_MASK; |
e84f84f2 | 2277 | hash = rt_hash(daddr, saddr, iif, rt_genid(net)); |
1da177e4 | 2278 | |
1da177e4 | 2279 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
d8d1f30b | 2280 | rth = rcu_dereference(rth->dst.rt_next)) { |
5e2b61f7 DM |
2281 | if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) | |
2282 | ((__force u32)rth->rt_key_src ^ (__force u32)saddr) | | |
2283 | (rth->rt_iif ^ iif) | | |
2284 | rth->rt_oif | | |
475949d8 | 2285 | (rth->rt_key_tos ^ tos)) == 0 && |
5e2b61f7 | 2286 | rth->rt_mark == skb->mark && |
d8d1f30b | 2287 | net_eq(dev_net(rth->dst.dev), net) && |
e84f84f2 | 2288 | !rt_is_expired(rth)) { |
407eadd9 | 2289 | if (noref) { |
d8d1f30b CG |
2290 | dst_use_noref(&rth->dst, jiffies); |
2291 | skb_dst_set_noref(skb, &rth->dst); | |
407eadd9 | 2292 | } else { |
d8d1f30b CG |
2293 | dst_use(&rth->dst, jiffies); |
2294 | skb_dst_set(skb, &rth->dst); | |
407eadd9 | 2295 | } |
1da177e4 LT |
2296 | RT_CACHE_STAT_INC(in_hit); |
2297 | rcu_read_unlock(); | |
1da177e4 LT |
2298 | return 0; |
2299 | } | |
2300 | RT_CACHE_STAT_INC(in_hlist_search); | |
2301 | } | |
1da177e4 | 2302 | |
1080d709 | 2303 | skip_cache: |
1da177e4 LT |
2304 | /* Multicast recognition logic is moved from route cache to here. |
2305 | The problem was that too many Ethernet cards have broken/missing | |
2306 | hardware multicast filters :-( As result the host on multicasting | |
2307 | network acquires a lot of useless route cache entries, sort of | |
2308 | SDR messages from all the world. Now we try to get rid of them. | |
2309 | Really, provided software IP multicast filter is organized | |
2310 | reasonably (at least, hashed), it does not result in a slowdown | |
2311 | comparing with route cache reject entries. | |
2312 | Note, that multicast routers are not affected, because | |
2313 | route cache entry is created eventually. | |
2314 | */ | |
f97c1e0c | 2315 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2316 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 2317 | |
96d36220 | 2318 | if (in_dev) { |
dbdd9a52 DM |
2319 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
2320 | ip_hdr(skb)->protocol); | |
1da177e4 LT |
2321 | if (our |
2322 | #ifdef CONFIG_IP_MROUTE | |
9d4fb27d JP |
2323 | || |
2324 | (!ipv4_is_local_multicast(daddr) && | |
2325 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2326 | #endif |
9d4fb27d | 2327 | ) { |
96d36220 ED |
2328 | int res = ip_route_input_mc(skb, daddr, saddr, |
2329 | tos, dev, our); | |
1da177e4 | 2330 | rcu_read_unlock(); |
96d36220 | 2331 | return res; |
1da177e4 LT |
2332 | } |
2333 | } | |
2334 | rcu_read_unlock(); | |
2335 | return -EINVAL; | |
2336 | } | |
96d36220 ED |
2337 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
2338 | rcu_read_unlock(); | |
2339 | return res; | |
1da177e4 | 2340 | } |
407eadd9 | 2341 | EXPORT_SYMBOL(ip_route_input_common); |
1da177e4 | 2342 | |
ebc0ffae | 2343 | /* called with rcu_read_lock() */ |
982721f3 | 2344 | static struct rtable *__mkroute_output(const struct fib_result *res, |
68a5e3dd | 2345 | const struct flowi4 *fl4, |
813b3b5d DM |
2346 | __be32 orig_daddr, __be32 orig_saddr, |
2347 | int orig_oif, struct net_device *dev_out, | |
5ada5527 | 2348 | unsigned int flags) |
1da177e4 | 2349 | { |
982721f3 | 2350 | struct fib_info *fi = res->fi; |
813b3b5d | 2351 | u32 tos = RT_FL_TOS(fl4); |
5ada5527 | 2352 | struct in_device *in_dev; |
982721f3 | 2353 | u16 type = res->type; |
5ada5527 | 2354 | struct rtable *rth; |
1da177e4 | 2355 | |
68a5e3dd | 2356 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) |
5ada5527 | 2357 | return ERR_PTR(-EINVAL); |
1da177e4 | 2358 | |
68a5e3dd | 2359 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2360 | type = RTN_BROADCAST; |
68a5e3dd | 2361 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2362 | type = RTN_MULTICAST; |
68a5e3dd | 2363 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2364 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2365 | |
2366 | if (dev_out->flags & IFF_LOOPBACK) | |
2367 | flags |= RTCF_LOCAL; | |
2368 | ||
dd28d1a0 | 2369 | in_dev = __in_dev_get_rcu(dev_out); |
ebc0ffae | 2370 | if (!in_dev) |
5ada5527 | 2371 | return ERR_PTR(-EINVAL); |
ebc0ffae | 2372 | |
982721f3 | 2373 | if (type == RTN_BROADCAST) { |
1da177e4 | 2374 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2375 | fi = NULL; |
2376 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2377 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2378 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2379 | fl4->flowi4_proto)) | |
1da177e4 LT |
2380 | flags &= ~RTCF_LOCAL; |
2381 | /* If multicast route do not exist use | |
dd28d1a0 ED |
2382 | * default one, but do not gateway in this case. |
2383 | * Yes, it is hack. | |
1da177e4 | 2384 | */ |
982721f3 DM |
2385 | if (fi && res->prefixlen < 4) |
2386 | fi = NULL; | |
1da177e4 LT |
2387 | } |
2388 | ||
5c1e6aa3 DM |
2389 | rth = rt_dst_alloc(dev_out, |
2390 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
0c4dcd58 | 2391 | IN_DEV_CONF_GET(in_dev, NOXFRM)); |
8391d07b | 2392 | if (!rth) |
5ada5527 | 2393 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2394 | |
cf911662 DM |
2395 | rth->dst.output = ip_output; |
2396 | ||
813b3b5d DM |
2397 | rth->rt_key_dst = orig_daddr; |
2398 | rth->rt_key_src = orig_saddr; | |
cf911662 DM |
2399 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
2400 | rth->rt_flags = flags; | |
2401 | rth->rt_type = type; | |
475949d8 | 2402 | rth->rt_key_tos = tos; |
68a5e3dd DM |
2403 | rth->rt_dst = fl4->daddr; |
2404 | rth->rt_src = fl4->saddr; | |
1b86a58f | 2405 | rth->rt_route_iif = 0; |
813b3b5d DM |
2406 | rth->rt_iif = orig_oif ? : dev_out->ifindex; |
2407 | rth->rt_oif = orig_oif; | |
2408 | rth->rt_mark = fl4->flowi4_mark; | |
68a5e3dd DM |
2409 | rth->rt_gateway = fl4->daddr; |
2410 | rth->rt_spec_dst= fl4->saddr; | |
cf911662 DM |
2411 | rth->rt_peer_genid = 0; |
2412 | rth->peer = NULL; | |
2413 | rth->fi = NULL; | |
1da177e4 LT |
2414 | |
2415 | RT_CACHE_STAT_INC(out_slow_tot); | |
2416 | ||
2417 | if (flags & RTCF_LOCAL) { | |
d8d1f30b | 2418 | rth->dst.input = ip_local_deliver; |
68a5e3dd | 2419 | rth->rt_spec_dst = fl4->daddr; |
1da177e4 LT |
2420 | } |
2421 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
68a5e3dd | 2422 | rth->rt_spec_dst = fl4->saddr; |
e905a9ed | 2423 | if (flags & RTCF_LOCAL && |
1da177e4 | 2424 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2425 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2426 | RT_CACHE_STAT_INC(out_slow_mc); |
2427 | } | |
2428 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2429 | if (type == RTN_MULTICAST) { |
1da177e4 | 2430 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2431 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2432 | rth->dst.input = ip_mr_input; |
2433 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2434 | } |
2435 | } | |
2436 | #endif | |
2437 | } | |
2438 | ||
813b3b5d | 2439 | rt_set_nexthop(rth, fl4, res, fi, type, 0); |
1da177e4 | 2440 | |
5ada5527 | 2441 | return rth; |
1da177e4 LT |
2442 | } |
2443 | ||
1da177e4 LT |
2444 | /* |
2445 | * Major route resolver routine. | |
0197aa38 | 2446 | * called with rcu_read_lock(); |
1da177e4 LT |
2447 | */ |
2448 | ||
813b3b5d | 2449 | static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4) |
1da177e4 | 2450 | { |
1da177e4 | 2451 | struct net_device *dev_out = NULL; |
813b3b5d DM |
2452 | u32 tos = RT_FL_TOS(fl4); |
2453 | unsigned int flags = 0; | |
2454 | struct fib_result res; | |
5ada5527 | 2455 | struct rtable *rth; |
813b3b5d DM |
2456 | __be32 orig_daddr; |
2457 | __be32 orig_saddr; | |
2458 | int orig_oif; | |
1da177e4 LT |
2459 | |
2460 | res.fi = NULL; | |
2461 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2462 | res.r = NULL; | |
2463 | #endif | |
2464 | ||
813b3b5d DM |
2465 | orig_daddr = fl4->daddr; |
2466 | orig_saddr = fl4->saddr; | |
2467 | orig_oif = fl4->flowi4_oif; | |
2468 | ||
2469 | fl4->flowi4_iif = net->loopback_dev->ifindex; | |
2470 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
2471 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2472 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2473 | |
010c2708 | 2474 | rcu_read_lock(); |
813b3b5d | 2475 | if (fl4->saddr) { |
b23dd4fe | 2476 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
2477 | if (ipv4_is_multicast(fl4->saddr) || |
2478 | ipv4_is_lbcast(fl4->saddr) || | |
2479 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
2480 | goto out; |
2481 | ||
1da177e4 LT |
2482 | /* I removed check for oif == dev_out->oif here. |
2483 | It was wrong for two reasons: | |
1ab35276 DL |
2484 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2485 | is assigned to multiple interfaces. | |
1da177e4 LT |
2486 | 2. Moreover, we are allowed to send packets with saddr |
2487 | of another iface. --ANK | |
2488 | */ | |
2489 | ||
813b3b5d DM |
2490 | if (fl4->flowi4_oif == 0 && |
2491 | (ipv4_is_multicast(fl4->daddr) || | |
2492 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2493 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2494 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
a210d01a JA |
2495 | if (dev_out == NULL) |
2496 | goto out; | |
2497 | ||
1da177e4 LT |
2498 | /* Special hack: user can direct multicasts |
2499 | and limited broadcast via necessary interface | |
2500 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2501 | This hack is not just for fun, it allows | |
2502 | vic,vat and friends to work. | |
2503 | They bind socket to loopback, set ttl to zero | |
2504 | and expect that it will work. | |
2505 | From the viewpoint of routing cache they are broken, | |
2506 | because we are not allowed to build multicast path | |
2507 | with loopback source addr (look, routing cache | |
2508 | cannot know, that ttl is zero, so that packet | |
2509 | will not leave this host and route is valid). | |
2510 | Luckily, this hack is good workaround. | |
2511 | */ | |
2512 | ||
813b3b5d | 2513 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2514 | goto make_route; |
2515 | } | |
a210d01a | 2516 | |
813b3b5d | 2517 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2518 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2519 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2520 | goto out; |
a210d01a | 2521 | } |
1da177e4 LT |
2522 | } |
2523 | ||
2524 | ||
813b3b5d DM |
2525 | if (fl4->flowi4_oif) { |
2526 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2527 | rth = ERR_PTR(-ENODEV); |
1da177e4 LT |
2528 | if (dev_out == NULL) |
2529 | goto out; | |
e5ed6399 HX |
2530 | |
2531 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2532 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2533 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2534 | goto out; |
2535 | } | |
813b3b5d DM |
2536 | if (ipv4_is_local_multicast(fl4->daddr) || |
2537 | ipv4_is_lbcast(fl4->daddr)) { | |
2538 | if (!fl4->saddr) | |
2539 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2540 | RT_SCOPE_LINK); | |
1da177e4 LT |
2541 | goto make_route; |
2542 | } | |
813b3b5d DM |
2543 | if (fl4->saddr) { |
2544 | if (ipv4_is_multicast(fl4->daddr)) | |
2545 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2546 | fl4->flowi4_scope); | |
2547 | else if (!fl4->daddr) | |
2548 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2549 | RT_SCOPE_HOST); | |
1da177e4 LT |
2550 | } |
2551 | } | |
2552 | ||
813b3b5d DM |
2553 | if (!fl4->daddr) { |
2554 | fl4->daddr = fl4->saddr; | |
2555 | if (!fl4->daddr) | |
2556 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2557 | dev_out = net->loopback_dev; |
813b3b5d | 2558 | fl4->flowi4_oif = net->loopback_dev->ifindex; |
1da177e4 LT |
2559 | res.type = RTN_LOCAL; |
2560 | flags |= RTCF_LOCAL; | |
2561 | goto make_route; | |
2562 | } | |
2563 | ||
813b3b5d | 2564 | if (fib_lookup(net, fl4, &res)) { |
1da177e4 | 2565 | res.fi = NULL; |
813b3b5d | 2566 | if (fl4->flowi4_oif) { |
1da177e4 LT |
2567 | /* Apparently, routing tables are wrong. Assume, |
2568 | that the destination is on link. | |
2569 | ||
2570 | WHY? DW. | |
2571 | Because we are allowed to send to iface | |
2572 | even if it has NO routes and NO assigned | |
2573 | addresses. When oif is specified, routing | |
2574 | tables are looked up with only one purpose: | |
2575 | to catch if destination is gatewayed, rather than | |
2576 | direct. Moreover, if MSG_DONTROUTE is set, | |
2577 | we send packet, ignoring both routing tables | |
2578 | and ifaddr state. --ANK | |
2579 | ||
2580 | ||
2581 | We could make it even if oif is unknown, | |
2582 | likely IPv6, but we do not. | |
2583 | */ | |
2584 | ||
813b3b5d DM |
2585 | if (fl4->saddr == 0) |
2586 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2587 | RT_SCOPE_LINK); | |
1da177e4 LT |
2588 | res.type = RTN_UNICAST; |
2589 | goto make_route; | |
2590 | } | |
b23dd4fe | 2591 | rth = ERR_PTR(-ENETUNREACH); |
1da177e4 LT |
2592 | goto out; |
2593 | } | |
1da177e4 LT |
2594 | |
2595 | if (res.type == RTN_LOCAL) { | |
813b3b5d | 2596 | if (!fl4->saddr) { |
9fc3bbb4 | 2597 | if (res.fi->fib_prefsrc) |
813b3b5d | 2598 | fl4->saddr = res.fi->fib_prefsrc; |
9fc3bbb4 | 2599 | else |
813b3b5d | 2600 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2601 | } |
b40afd0e | 2602 | dev_out = net->loopback_dev; |
813b3b5d | 2603 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2604 | res.fi = NULL; |
2605 | flags |= RTCF_LOCAL; | |
2606 | goto make_route; | |
2607 | } | |
2608 | ||
2609 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
813b3b5d | 2610 | if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) |
1b7fe593 | 2611 | fib_select_multipath(&res); |
1da177e4 LT |
2612 | else |
2613 | #endif | |
21d8c49e DM |
2614 | if (!res.prefixlen && |
2615 | res.table->tb_num_default > 1 && | |
813b3b5d | 2616 | res.type == RTN_UNICAST && !fl4->flowi4_oif) |
0c838ff1 | 2617 | fib_select_default(&res); |
1da177e4 | 2618 | |
813b3b5d DM |
2619 | if (!fl4->saddr) |
2620 | fl4->saddr = FIB_RES_PREFSRC(net, res); | |
1da177e4 | 2621 | |
1da177e4 | 2622 | dev_out = FIB_RES_DEV(res); |
813b3b5d | 2623 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2624 | |
2625 | ||
2626 | make_route: | |
813b3b5d DM |
2627 | rth = __mkroute_output(&res, fl4, orig_daddr, orig_saddr, orig_oif, |
2628 | dev_out, flags); | |
b23dd4fe | 2629 | if (!IS_ERR(rth)) { |
5ada5527 DM |
2630 | unsigned int hash; |
2631 | ||
813b3b5d | 2632 | hash = rt_hash(orig_daddr, orig_saddr, orig_oif, |
5ada5527 | 2633 | rt_genid(dev_net(dev_out))); |
813b3b5d | 2634 | rth = rt_intern_hash(hash, rth, NULL, orig_oif); |
5ada5527 | 2635 | } |
1da177e4 | 2636 | |
010c2708 DM |
2637 | out: |
2638 | rcu_read_unlock(); | |
b23dd4fe | 2639 | return rth; |
1da177e4 LT |
2640 | } |
2641 | ||
813b3b5d | 2642 | struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4) |
1da177e4 | 2643 | { |
1da177e4 | 2644 | struct rtable *rth; |
010c2708 | 2645 | unsigned int hash; |
1da177e4 | 2646 | |
1080d709 NH |
2647 | if (!rt_caching(net)) |
2648 | goto slow_output; | |
2649 | ||
9d6ec938 | 2650 | hash = rt_hash(flp4->daddr, flp4->saddr, flp4->flowi4_oif, rt_genid(net)); |
1da177e4 LT |
2651 | |
2652 | rcu_read_lock_bh(); | |
a898def2 | 2653 | for (rth = rcu_dereference_bh(rt_hash_table[hash].chain); rth; |
d8d1f30b | 2654 | rth = rcu_dereference_bh(rth->dst.rt_next)) { |
9d6ec938 DM |
2655 | if (rth->rt_key_dst == flp4->daddr && |
2656 | rth->rt_key_src == flp4->saddr && | |
c7537967 | 2657 | rt_is_output_route(rth) && |
9d6ec938 DM |
2658 | rth->rt_oif == flp4->flowi4_oif && |
2659 | rth->rt_mark == flp4->flowi4_mark && | |
475949d8 | 2660 | !((rth->rt_key_tos ^ flp4->flowi4_tos) & |
b5921910 | 2661 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
d8d1f30b | 2662 | net_eq(dev_net(rth->dst.dev), net) && |
e84f84f2 | 2663 | !rt_is_expired(rth)) { |
d8d1f30b | 2664 | dst_use(&rth->dst, jiffies); |
1da177e4 LT |
2665 | RT_CACHE_STAT_INC(out_hit); |
2666 | rcu_read_unlock_bh(); | |
56157872 DM |
2667 | if (!flp4->saddr) |
2668 | flp4->saddr = rth->rt_src; | |
2669 | if (!flp4->daddr) | |
2670 | flp4->daddr = rth->rt_dst; | |
b23dd4fe | 2671 | return rth; |
1da177e4 LT |
2672 | } |
2673 | RT_CACHE_STAT_INC(out_hlist_search); | |
2674 | } | |
2675 | rcu_read_unlock_bh(); | |
2676 | ||
1080d709 | 2677 | slow_output: |
9d6ec938 | 2678 | return ip_route_output_slow(net, flp4); |
1da177e4 | 2679 | } |
d8c97a94 ACM |
2680 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2681 | ||
ae2688d5 JW |
2682 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2683 | { | |
2684 | return NULL; | |
2685 | } | |
2686 | ||
ec831ea7 RD |
2687 | static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst) |
2688 | { | |
2689 | return 0; | |
2690 | } | |
2691 | ||
14e50e57 DM |
2692 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
2693 | { | |
2694 | } | |
2695 | ||
0972ddb2 HB |
2696 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2697 | unsigned long old) | |
2698 | { | |
2699 | return NULL; | |
2700 | } | |
2701 | ||
14e50e57 DM |
2702 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2703 | .family = AF_INET, | |
09640e63 | 2704 | .protocol = cpu_to_be16(ETH_P_IP), |
14e50e57 | 2705 | .destroy = ipv4_dst_destroy, |
ae2688d5 | 2706 | .check = ipv4_blackhole_dst_check, |
ec831ea7 | 2707 | .default_mtu = ipv4_blackhole_default_mtu, |
214f45c9 | 2708 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2709 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
0972ddb2 | 2710 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
14e50e57 DM |
2711 | }; |
2712 | ||
2774c131 | 2713 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2714 | { |
5c1e6aa3 | 2715 | struct rtable *rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, 0, 0); |
2774c131 | 2716 | struct rtable *ort = (struct rtable *) dst_orig; |
14e50e57 DM |
2717 | |
2718 | if (rt) { | |
d8d1f30b | 2719 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2720 | |
14e50e57 | 2721 | new->__use = 1; |
352e512c HX |
2722 | new->input = dst_discard; |
2723 | new->output = dst_discard; | |
defb3519 | 2724 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2725 | |
d8d1f30b | 2726 | new->dev = ort->dst.dev; |
14e50e57 DM |
2727 | if (new->dev) |
2728 | dev_hold(new->dev); | |
2729 | ||
5e2b61f7 DM |
2730 | rt->rt_key_dst = ort->rt_key_dst; |
2731 | rt->rt_key_src = ort->rt_key_src; | |
475949d8 | 2732 | rt->rt_key_tos = ort->rt_key_tos; |
1b86a58f | 2733 | rt->rt_route_iif = ort->rt_route_iif; |
5e2b61f7 DM |
2734 | rt->rt_iif = ort->rt_iif; |
2735 | rt->rt_oif = ort->rt_oif; | |
2736 | rt->rt_mark = ort->rt_mark; | |
14e50e57 | 2737 | |
e84f84f2 | 2738 | rt->rt_genid = rt_genid(net); |
14e50e57 DM |
2739 | rt->rt_flags = ort->rt_flags; |
2740 | rt->rt_type = ort->rt_type; | |
2741 | rt->rt_dst = ort->rt_dst; | |
2742 | rt->rt_src = ort->rt_src; | |
14e50e57 DM |
2743 | rt->rt_gateway = ort->rt_gateway; |
2744 | rt->rt_spec_dst = ort->rt_spec_dst; | |
2745 | rt->peer = ort->peer; | |
2746 | if (rt->peer) | |
2747 | atomic_inc(&rt->peer->refcnt); | |
62fa8a84 DM |
2748 | rt->fi = ort->fi; |
2749 | if (rt->fi) | |
2750 | atomic_inc(&rt->fi->fib_clntref); | |
14e50e57 DM |
2751 | |
2752 | dst_free(new); | |
2753 | } | |
2754 | ||
2774c131 DM |
2755 | dst_release(dst_orig); |
2756 | ||
2757 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2758 | } |
2759 | ||
9d6ec938 | 2760 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
b23dd4fe | 2761 | struct sock *sk) |
1da177e4 | 2762 | { |
9d6ec938 | 2763 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2764 | |
b23dd4fe DM |
2765 | if (IS_ERR(rt)) |
2766 | return rt; | |
1da177e4 | 2767 | |
56157872 | 2768 | if (flp4->flowi4_proto) |
9d6ec938 DM |
2769 | rt = (struct rtable *) xfrm_lookup(net, &rt->dst, |
2770 | flowi4_to_flowi(flp4), | |
2771 | sk, 0); | |
1da177e4 | 2772 | |
b23dd4fe | 2773 | return rt; |
1da177e4 | 2774 | } |
d8c97a94 ACM |
2775 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2776 | ||
4feb88e5 BT |
2777 | static int rt_fill_info(struct net *net, |
2778 | struct sk_buff *skb, u32 pid, u32 seq, int event, | |
b6544c0b | 2779 | int nowait, unsigned int flags) |
1da177e4 | 2780 | { |
511c3f92 | 2781 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 2782 | struct rtmsg *r; |
be403ea1 | 2783 | struct nlmsghdr *nlh; |
fe6fe792 ED |
2784 | long expires = 0; |
2785 | const struct inet_peer *peer = rt->peer; | |
e3703b3d | 2786 | u32 id = 0, ts = 0, tsage = 0, error; |
be403ea1 TG |
2787 | |
2788 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2789 | if (nlh == NULL) | |
26932566 | 2790 | return -EMSGSIZE; |
be403ea1 TG |
2791 | |
2792 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2793 | r->rtm_family = AF_INET; |
2794 | r->rtm_dst_len = 32; | |
2795 | r->rtm_src_len = 0; | |
475949d8 | 2796 | r->rtm_tos = rt->rt_key_tos; |
1da177e4 | 2797 | r->rtm_table = RT_TABLE_MAIN; |
be403ea1 | 2798 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
2799 | r->rtm_type = rt->rt_type; |
2800 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2801 | r->rtm_protocol = RTPROT_UNSPEC; | |
2802 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2803 | if (rt->rt_flags & RTCF_NOTIFY) | |
2804 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2805 | |
17fb2c64 | 2806 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
be403ea1 | 2807 | |
5e2b61f7 | 2808 | if (rt->rt_key_src) { |
1da177e4 | 2809 | r->rtm_src_len = 32; |
5e2b61f7 | 2810 | NLA_PUT_BE32(skb, RTA_SRC, rt->rt_key_src); |
1da177e4 | 2811 | } |
d8d1f30b CG |
2812 | if (rt->dst.dev) |
2813 | NLA_PUT_U32(skb, RTA_OIF, rt->dst.dev->ifindex); | |
c7066f70 | 2814 | #ifdef CONFIG_IP_ROUTE_CLASSID |
d8d1f30b CG |
2815 | if (rt->dst.tclassid) |
2816 | NLA_PUT_U32(skb, RTA_FLOW, rt->dst.tclassid); | |
1da177e4 | 2817 | #endif |
c7537967 | 2818 | if (rt_is_input_route(rt)) |
17fb2c64 | 2819 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
5e2b61f7 | 2820 | else if (rt->rt_src != rt->rt_key_src) |
17fb2c64 | 2821 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
be403ea1 | 2822 | |
1da177e4 | 2823 | if (rt->rt_dst != rt->rt_gateway) |
17fb2c64 | 2824 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
be403ea1 | 2825 | |
defb3519 | 2826 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
be403ea1 TG |
2827 | goto nla_put_failure; |
2828 | ||
5e2b61f7 DM |
2829 | if (rt->rt_mark) |
2830 | NLA_PUT_BE32(skb, RTA_MARK, rt->rt_mark); | |
963bfeee | 2831 | |
d8d1f30b | 2832 | error = rt->dst.error; |
fe6fe792 | 2833 | if (peer) { |
317fe0e6 | 2834 | inet_peer_refcheck(rt->peer); |
fe6fe792 ED |
2835 | id = atomic_read(&peer->ip_id_count) & 0xffff; |
2836 | if (peer->tcp_ts_stamp) { | |
2837 | ts = peer->tcp_ts; | |
2838 | tsage = get_seconds() - peer->tcp_ts_stamp; | |
1da177e4 | 2839 | } |
fe6fe792 ED |
2840 | expires = ACCESS_ONCE(peer->pmtu_expires); |
2841 | if (expires) | |
2842 | expires -= jiffies; | |
1da177e4 | 2843 | } |
be403ea1 | 2844 | |
c7537967 | 2845 | if (rt_is_input_route(rt)) { |
1da177e4 | 2846 | #ifdef CONFIG_IP_MROUTE |
e448515c | 2847 | __be32 dst = rt->rt_dst; |
1da177e4 | 2848 | |
f97c1e0c | 2849 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
4feb88e5 | 2850 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { |
9a1b9496 DM |
2851 | int err = ipmr_get_route(net, skb, |
2852 | rt->rt_src, rt->rt_dst, | |
2853 | r, nowait); | |
1da177e4 LT |
2854 | if (err <= 0) { |
2855 | if (!nowait) { | |
2856 | if (err == 0) | |
2857 | return 0; | |
be403ea1 | 2858 | goto nla_put_failure; |
1da177e4 LT |
2859 | } else { |
2860 | if (err == -EMSGSIZE) | |
be403ea1 | 2861 | goto nla_put_failure; |
e3703b3d | 2862 | error = err; |
1da177e4 LT |
2863 | } |
2864 | } | |
2865 | } else | |
2866 | #endif | |
5e2b61f7 | 2867 | NLA_PUT_U32(skb, RTA_IIF, rt->rt_iif); |
1da177e4 LT |
2868 | } |
2869 | ||
d8d1f30b | 2870 | if (rtnl_put_cacheinfo(skb, &rt->dst, id, ts, tsage, |
e3703b3d TG |
2871 | expires, error) < 0) |
2872 | goto nla_put_failure; | |
be403ea1 TG |
2873 | |
2874 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2875 | |
be403ea1 | 2876 | nla_put_failure: |
26932566 PM |
2877 | nlmsg_cancel(skb, nlh); |
2878 | return -EMSGSIZE; | |
1da177e4 LT |
2879 | } |
2880 | ||
63f3444f | 2881 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2882 | { |
3b1e0a65 | 2883 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2884 | struct rtmsg *rtm; |
2885 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2886 | struct rtable *rt = NULL; |
9e12bb22 AV |
2887 | __be32 dst = 0; |
2888 | __be32 src = 0; | |
2889 | u32 iif; | |
d889ce3b | 2890 | int err; |
963bfeee | 2891 | int mark; |
1da177e4 LT |
2892 | struct sk_buff *skb; |
2893 | ||
d889ce3b TG |
2894 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2895 | if (err < 0) | |
2896 | goto errout; | |
2897 | ||
2898 | rtm = nlmsg_data(nlh); | |
2899 | ||
1da177e4 | 2900 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2901 | if (skb == NULL) { |
2902 | err = -ENOBUFS; | |
2903 | goto errout; | |
2904 | } | |
1da177e4 LT |
2905 | |
2906 | /* Reserve room for dummy headers, this skb can pass | |
2907 | through good chunk of routing engine. | |
2908 | */ | |
459a98ed | 2909 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2910 | skb_reset_network_header(skb); |
d2c962b8 SH |
2911 | |
2912 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2913 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2914 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2915 | ||
17fb2c64 AV |
2916 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2917 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2918 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 2919 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
1da177e4 LT |
2920 | |
2921 | if (iif) { | |
d889ce3b TG |
2922 | struct net_device *dev; |
2923 | ||
1937504d | 2924 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2925 | if (dev == NULL) { |
2926 | err = -ENODEV; | |
2927 | goto errout_free; | |
2928 | } | |
2929 | ||
1da177e4 LT |
2930 | skb->protocol = htons(ETH_P_IP); |
2931 | skb->dev = dev; | |
963bfeee | 2932 | skb->mark = mark; |
1da177e4 LT |
2933 | local_bh_disable(); |
2934 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2935 | local_bh_enable(); | |
d889ce3b | 2936 | |
511c3f92 | 2937 | rt = skb_rtable(skb); |
d8d1f30b CG |
2938 | if (err == 0 && rt->dst.error) |
2939 | err = -rt->dst.error; | |
1da177e4 | 2940 | } else { |
68a5e3dd DM |
2941 | struct flowi4 fl4 = { |
2942 | .daddr = dst, | |
2943 | .saddr = src, | |
2944 | .flowi4_tos = rtm->rtm_tos, | |
2945 | .flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, | |
2946 | .flowi4_mark = mark, | |
d889ce3b | 2947 | }; |
9d6ec938 | 2948 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe DM |
2949 | |
2950 | err = 0; | |
2951 | if (IS_ERR(rt)) | |
2952 | err = PTR_ERR(rt); | |
1da177e4 | 2953 | } |
d889ce3b | 2954 | |
1da177e4 | 2955 | if (err) |
d889ce3b | 2956 | goto errout_free; |
1da177e4 | 2957 | |
d8d1f30b | 2958 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
2959 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2960 | rt->rt_flags |= RTCF_NOTIFY; | |
2961 | ||
4feb88e5 | 2962 | err = rt_fill_info(net, skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2963 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2964 | if (err <= 0) |
2965 | goto errout_free; | |
1da177e4 | 2966 | |
1937504d | 2967 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2968 | errout: |
2942e900 | 2969 | return err; |
1da177e4 | 2970 | |
d889ce3b | 2971 | errout_free: |
1da177e4 | 2972 | kfree_skb(skb); |
d889ce3b | 2973 | goto errout; |
1da177e4 LT |
2974 | } |
2975 | ||
2976 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2977 | { | |
2978 | struct rtable *rt; | |
2979 | int h, s_h; | |
2980 | int idx, s_idx; | |
1937504d DL |
2981 | struct net *net; |
2982 | ||
3b1e0a65 | 2983 | net = sock_net(skb->sk); |
1da177e4 LT |
2984 | |
2985 | s_h = cb->args[0]; | |
d8c92830 ED |
2986 | if (s_h < 0) |
2987 | s_h = 0; | |
1da177e4 | 2988 | s_idx = idx = cb->args[1]; |
a6272665 ED |
2989 | for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) { |
2990 | if (!rt_hash_table[h].chain) | |
2991 | continue; | |
1da177e4 | 2992 | rcu_read_lock_bh(); |
a898def2 | 2993 | for (rt = rcu_dereference_bh(rt_hash_table[h].chain), idx = 0; rt; |
d8d1f30b CG |
2994 | rt = rcu_dereference_bh(rt->dst.rt_next), idx++) { |
2995 | if (!net_eq(dev_net(rt->dst.dev), net) || idx < s_idx) | |
1da177e4 | 2996 | continue; |
e84f84f2 | 2997 | if (rt_is_expired(rt)) |
29e75252 | 2998 | continue; |
d8d1f30b | 2999 | skb_dst_set_noref(skb, &rt->dst); |
4feb88e5 | 3000 | if (rt_fill_info(net, skb, NETLINK_CB(cb->skb).pid, |
e905a9ed | 3001 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 3002 | 1, NLM_F_MULTI) <= 0) { |
adf30907 | 3003 | skb_dst_drop(skb); |
1da177e4 LT |
3004 | rcu_read_unlock_bh(); |
3005 | goto done; | |
3006 | } | |
adf30907 | 3007 | skb_dst_drop(skb); |
1da177e4 LT |
3008 | } |
3009 | rcu_read_unlock_bh(); | |
3010 | } | |
3011 | ||
3012 | done: | |
3013 | cb->args[0] = h; | |
3014 | cb->args[1] = idx; | |
3015 | return skb->len; | |
3016 | } | |
3017 | ||
3018 | void ip_rt_multicast_event(struct in_device *in_dev) | |
3019 | { | |
76e6ebfb | 3020 | rt_cache_flush(dev_net(in_dev->dev), 0); |
1da177e4 LT |
3021 | } |
3022 | ||
3023 | #ifdef CONFIG_SYSCTL | |
81c684d1 | 3024 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
8d65af78 | 3025 | void __user *buffer, |
1da177e4 LT |
3026 | size_t *lenp, loff_t *ppos) |
3027 | { | |
3028 | if (write) { | |
639e104f | 3029 | int flush_delay; |
81c684d1 | 3030 | ctl_table ctl; |
39a23e75 | 3031 | struct net *net; |
639e104f | 3032 | |
81c684d1 DL |
3033 | memcpy(&ctl, __ctl, sizeof(ctl)); |
3034 | ctl.data = &flush_delay; | |
8d65af78 | 3035 | proc_dointvec(&ctl, write, buffer, lenp, ppos); |
639e104f | 3036 | |
81c684d1 | 3037 | net = (struct net *)__ctl->extra1; |
39a23e75 | 3038 | rt_cache_flush(net, flush_delay); |
1da177e4 | 3039 | return 0; |
e905a9ed | 3040 | } |
1da177e4 LT |
3041 | |
3042 | return -EINVAL; | |
3043 | } | |
3044 | ||
eeb61f71 | 3045 | static ctl_table ipv4_route_table[] = { |
1da177e4 | 3046 | { |
1da177e4 LT |
3047 | .procname = "gc_thresh", |
3048 | .data = &ipv4_dst_ops.gc_thresh, | |
3049 | .maxlen = sizeof(int), | |
3050 | .mode = 0644, | |
6d9f239a | 3051 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3052 | }, |
3053 | { | |
1da177e4 LT |
3054 | .procname = "max_size", |
3055 | .data = &ip_rt_max_size, | |
3056 | .maxlen = sizeof(int), | |
3057 | .mode = 0644, | |
6d9f239a | 3058 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3059 | }, |
3060 | { | |
3061 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 3062 | |
1da177e4 LT |
3063 | .procname = "gc_min_interval", |
3064 | .data = &ip_rt_gc_min_interval, | |
3065 | .maxlen = sizeof(int), | |
3066 | .mode = 0644, | |
6d9f239a | 3067 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3068 | }, |
3069 | { | |
1da177e4 LT |
3070 | .procname = "gc_min_interval_ms", |
3071 | .data = &ip_rt_gc_min_interval, | |
3072 | .maxlen = sizeof(int), | |
3073 | .mode = 0644, | |
6d9f239a | 3074 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
3075 | }, |
3076 | { | |
1da177e4 LT |
3077 | .procname = "gc_timeout", |
3078 | .data = &ip_rt_gc_timeout, | |
3079 | .maxlen = sizeof(int), | |
3080 | .mode = 0644, | |
6d9f239a | 3081 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3082 | }, |
3083 | { | |
1da177e4 LT |
3084 | .procname = "gc_interval", |
3085 | .data = &ip_rt_gc_interval, | |
3086 | .maxlen = sizeof(int), | |
3087 | .mode = 0644, | |
6d9f239a | 3088 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3089 | }, |
3090 | { | |
1da177e4 LT |
3091 | .procname = "redirect_load", |
3092 | .data = &ip_rt_redirect_load, | |
3093 | .maxlen = sizeof(int), | |
3094 | .mode = 0644, | |
6d9f239a | 3095 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3096 | }, |
3097 | { | |
1da177e4 LT |
3098 | .procname = "redirect_number", |
3099 | .data = &ip_rt_redirect_number, | |
3100 | .maxlen = sizeof(int), | |
3101 | .mode = 0644, | |
6d9f239a | 3102 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3103 | }, |
3104 | { | |
1da177e4 LT |
3105 | .procname = "redirect_silence", |
3106 | .data = &ip_rt_redirect_silence, | |
3107 | .maxlen = sizeof(int), | |
3108 | .mode = 0644, | |
6d9f239a | 3109 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3110 | }, |
3111 | { | |
1da177e4 LT |
3112 | .procname = "error_cost", |
3113 | .data = &ip_rt_error_cost, | |
3114 | .maxlen = sizeof(int), | |
3115 | .mode = 0644, | |
6d9f239a | 3116 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3117 | }, |
3118 | { | |
1da177e4 LT |
3119 | .procname = "error_burst", |
3120 | .data = &ip_rt_error_burst, | |
3121 | .maxlen = sizeof(int), | |
3122 | .mode = 0644, | |
6d9f239a | 3123 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3124 | }, |
3125 | { | |
1da177e4 LT |
3126 | .procname = "gc_elasticity", |
3127 | .data = &ip_rt_gc_elasticity, | |
3128 | .maxlen = sizeof(int), | |
3129 | .mode = 0644, | |
6d9f239a | 3130 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3131 | }, |
3132 | { | |
1da177e4 LT |
3133 | .procname = "mtu_expires", |
3134 | .data = &ip_rt_mtu_expires, | |
3135 | .maxlen = sizeof(int), | |
3136 | .mode = 0644, | |
6d9f239a | 3137 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3138 | }, |
3139 | { | |
1da177e4 LT |
3140 | .procname = "min_pmtu", |
3141 | .data = &ip_rt_min_pmtu, | |
3142 | .maxlen = sizeof(int), | |
3143 | .mode = 0644, | |
6d9f239a | 3144 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3145 | }, |
3146 | { | |
1da177e4 LT |
3147 | .procname = "min_adv_mss", |
3148 | .data = &ip_rt_min_advmss, | |
3149 | .maxlen = sizeof(int), | |
3150 | .mode = 0644, | |
6d9f239a | 3151 | .proc_handler = proc_dointvec, |
1da177e4 | 3152 | }, |
f8572d8f | 3153 | { } |
1da177e4 | 3154 | }; |
39a23e75 | 3155 | |
2f4520d3 AV |
3156 | static struct ctl_table empty[1]; |
3157 | ||
3158 | static struct ctl_table ipv4_skeleton[] = | |
3159 | { | |
f8572d8f | 3160 | { .procname = "route", |
d994af0d | 3161 | .mode = 0555, .child = ipv4_route_table}, |
f8572d8f | 3162 | { .procname = "neigh", |
d994af0d | 3163 | .mode = 0555, .child = empty}, |
2f4520d3 AV |
3164 | { } |
3165 | }; | |
3166 | ||
3167 | static __net_initdata struct ctl_path ipv4_path[] = { | |
f8572d8f EB |
3168 | { .procname = "net", }, |
3169 | { .procname = "ipv4", }, | |
39a23e75 DL |
3170 | { }, |
3171 | }; | |
3172 | ||
39a23e75 DL |
3173 | static struct ctl_table ipv4_route_flush_table[] = { |
3174 | { | |
39a23e75 DL |
3175 | .procname = "flush", |
3176 | .maxlen = sizeof(int), | |
3177 | .mode = 0200, | |
6d9f239a | 3178 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 3179 | }, |
f8572d8f | 3180 | { }, |
39a23e75 DL |
3181 | }; |
3182 | ||
2f4520d3 | 3183 | static __net_initdata struct ctl_path ipv4_route_path[] = { |
f8572d8f EB |
3184 | { .procname = "net", }, |
3185 | { .procname = "ipv4", }, | |
3186 | { .procname = "route", }, | |
2f4520d3 AV |
3187 | { }, |
3188 | }; | |
3189 | ||
39a23e75 DL |
3190 | static __net_init int sysctl_route_net_init(struct net *net) |
3191 | { | |
3192 | struct ctl_table *tbl; | |
3193 | ||
3194 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 3195 | if (!net_eq(net, &init_net)) { |
39a23e75 DL |
3196 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
3197 | if (tbl == NULL) | |
3198 | goto err_dup; | |
3199 | } | |
3200 | tbl[0].extra1 = net; | |
3201 | ||
3202 | net->ipv4.route_hdr = | |
3203 | register_net_sysctl_table(net, ipv4_route_path, tbl); | |
3204 | if (net->ipv4.route_hdr == NULL) | |
3205 | goto err_reg; | |
3206 | return 0; | |
3207 | ||
3208 | err_reg: | |
3209 | if (tbl != ipv4_route_flush_table) | |
3210 | kfree(tbl); | |
3211 | err_dup: | |
3212 | return -ENOMEM; | |
3213 | } | |
3214 | ||
3215 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3216 | { | |
3217 | struct ctl_table *tbl; | |
3218 | ||
3219 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3220 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3221 | BUG_ON(tbl == ipv4_route_flush_table); | |
3222 | kfree(tbl); | |
3223 | } | |
3224 | ||
3225 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3226 | .init = sysctl_route_net_init, | |
3227 | .exit = sysctl_route_net_exit, | |
3228 | }; | |
1da177e4 LT |
3229 | #endif |
3230 | ||
3ee94372 | 3231 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 3232 | { |
3ee94372 NH |
3233 | get_random_bytes(&net->ipv4.rt_genid, |
3234 | sizeof(net->ipv4.rt_genid)); | |
436c3b66 DM |
3235 | get_random_bytes(&net->ipv4.dev_addr_genid, |
3236 | sizeof(net->ipv4.dev_addr_genid)); | |
9f5e97e5 DL |
3237 | return 0; |
3238 | } | |
3239 | ||
3ee94372 NH |
3240 | static __net_initdata struct pernet_operations rt_genid_ops = { |
3241 | .init = rt_genid_init, | |
9f5e97e5 DL |
3242 | }; |
3243 | ||
3244 | ||
c7066f70 | 3245 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3246 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3247 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 LT |
3248 | |
3249 | static __initdata unsigned long rhash_entries; | |
3250 | static int __init set_rhash_entries(char *str) | |
3251 | { | |
3252 | if (!str) | |
3253 | return 0; | |
3254 | rhash_entries = simple_strtoul(str, &str, 0); | |
3255 | return 1; | |
3256 | } | |
3257 | __setup("rhash_entries=", set_rhash_entries); | |
3258 | ||
3259 | int __init ip_rt_init(void) | |
3260 | { | |
424c4b70 | 3261 | int rc = 0; |
1da177e4 | 3262 | |
c7066f70 | 3263 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3264 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3265 | if (!ip_rt_acct) |
3266 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3267 | #endif |
3268 | ||
e5d679f3 AD |
3269 | ipv4_dst_ops.kmem_cachep = |
3270 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3271 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3272 | |
14e50e57 DM |
3273 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3274 | ||
fc66f95c ED |
3275 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3276 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3277 | ||
3278 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3279 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3280 | ||
424c4b70 ED |
3281 | rt_hash_table = (struct rt_hash_bucket *) |
3282 | alloc_large_system_hash("IP route cache", | |
3283 | sizeof(struct rt_hash_bucket), | |
3284 | rhash_entries, | |
4481374c | 3285 | (totalram_pages >= 128 * 1024) ? |
18955cfc | 3286 | 15 : 17, |
8d1502de | 3287 | 0, |
424c4b70 ED |
3288 | &rt_hash_log, |
3289 | &rt_hash_mask, | |
c9503e0f | 3290 | rhash_entries ? 0 : 512 * 1024); |
22c047cc ED |
3291 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
3292 | rt_hash_lock_init(); | |
1da177e4 LT |
3293 | |
3294 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); | |
3295 | ip_rt_max_size = (rt_hash_mask + 1) * 16; | |
3296 | ||
1da177e4 LT |
3297 | devinet_init(); |
3298 | ip_fib_init(); | |
3299 | ||
73b38711 | 3300 | if (ip_rt_proc_init()) |
107f1634 | 3301 | printk(KERN_ERR "Unable to create route proc files\n"); |
1da177e4 LT |
3302 | #ifdef CONFIG_XFRM |
3303 | xfrm_init(); | |
a33bc5c1 | 3304 | xfrm4_init(ip_rt_max_size); |
1da177e4 | 3305 | #endif |
c7ac8679 | 3306 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
63f3444f | 3307 | |
39a23e75 DL |
3308 | #ifdef CONFIG_SYSCTL |
3309 | register_pernet_subsys(&sysctl_route_ops); | |
3310 | #endif | |
3ee94372 | 3311 | register_pernet_subsys(&rt_genid_ops); |
1da177e4 LT |
3312 | return rc; |
3313 | } | |
3314 | ||
a1bc6eb4 | 3315 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3316 | /* |
3317 | * We really need to sanitize the damn ipv4 init order, then all | |
3318 | * this nonsense will go away. | |
3319 | */ | |
3320 | void __init ip_static_sysctl_init(void) | |
3321 | { | |
2f4520d3 | 3322 | register_sysctl_paths(ipv4_path, ipv4_skeleton); |
eeb61f71 | 3323 | } |
a1bc6eb4 | 3324 | #endif |